Field of the Invention
[0001] The present invention relates to the technical field of firefighting and rescue apparatuses,
and more particularly relates to a multi-stage hydraulic multiplication pulley vertical
lifting-type elevating platform fire truck.
Background of the Invention
[0002] More and more high-rise buildings have been built. The height of high-rise buildings
is far higher than an elevating height of a rescue fire truck. For example, the high-altitude
rescue fire truck currently highest in the world has a maximum rescue height of 112
meters, and it adopts a crank arm structure, with a truck body of 18.9 meters in length,
2.5 meters in width, and 4 meters in height. It has a maximum height rescue fire radius
of 6 meters and a large turning radius. Such a colossus needs enough road turns to
travel among a building complex in a community, which makes it impossible for such
rescue vehicles to access to the currently dense building complexes. In addition,
operation of the on-board crank arm turning structure relies on hydraulic support
legs to maintain stability of the truck overall, which requires a high hydraulic power.
Since the crank arm turning structure is mounted on the vehicle, the high gravitational
centre causes insufficient stability and thus unsatisfactory high-altitude firefighting
and rescue effect. Besides, the rotary platform of such high-altitude rescue fire
truck is generally disposed at the bottom of a primary telescopic arm and mounted
on the truck chassis, and the working cage is disposed at the top end of the primary
telescopic arm, so that the rescue position is identified by rotating the bottom rotary
platform. However, the existing high-altitude rescue trucks are mostly of a crank
arm structure, and when the crank arm extends to its maximum height, the turning radius
of the working cage will be small, which in turn limits the rescue reach. Particularly,
due to load limitation of crank arms, the rescue truck with a crank arm turning structure
can only work with full load capacity when the crank arm extends 70% or above, and
therefore there appears rescue blind area during extension of the crank arm. For example,
a fire truck with a rescue height of 88 meters cannot perform rescue at a height of
under 60 meters. Therefore, once an 88-meter high-rise building has an accident, three
fire trucks should be deployed to satisfy rescue for upper floors, middle floors,
and lower floors, respectively, which significantly increases equipment investment
and rescue costs.
[0003] Another telescopic arm structure is of a telescoping cylinder type, which has a limited
number of sections. Telescopic arms of both types are actuated to elevate via telescoping
of hydraulic cylinders, so that their elevating height are largely dependent on the
transmission manner of the hydraulic cylinders. With this single transmission manner
relying on telescoping of the stroke of hydraulic cylinders only, the rescue height
of the telescopic arm can hardly access the height of current high-rise buildings.
[0004] In addition, telescopic arms of both structures are mounted in a tilting, telescoping
manner, where the telescopic arm is mounted on the rotary platform. As such, they
have common drawbacks: firstly, the higher the telescopic arm extends, the smaller
its rescue radius; and secondly, the rotary platform has a large rotational momentum,
resulting in a high energy consumption and a poor stability, and a slow rotational
speed.
[0005] Therefore, in the field of firefighting and rescue apparatuses, there is still a
need for study and improvement on a multi-stage hydraulic multiplication pulley vertical
lifting-type elevating platform fire truck, which is both the current hotspot and
focus in the field of firefighting and rescue apparatuses, and the starting point
from which the present invention is conducted.
Summary of the Invention
[0006] To this end, embodiments of the present invention provide a multi-stage hydraulic
multiplication pulley vertical lifting-type elevating platform fire truck to address
the technical problem that the existing high-altitude fire trucks have a small maximum
height rescue radius and a severely limited maximum rescue height by the transmission
manner of hydraulic cylinders.
[0007] To achieve the objectives above, embodiments of the present invention provide the
following technical solutions:
According to the embodiments of the present invention, there is provided a multi-stage
hydraulic multiplication pulley vertical lifting-type elevating platform fire truck,
comprising a truck chassis, a telescopic arm is mounted to a tail of the truck chassis
by hinging, and a rotary platform is provided on top end of the telescopic arm; wherein
a working arm is mounted on the rotary platform, and a working cage is mounted at
one end of the working arm; wherein a turning hydraulic cylinder is mounted on the
truck chassis, with one end mounted on the truck chassis by hinging, and the other
end mounted on the telescopic arm by hinging; wherein front hydraulic support legs
are mounted on the truck chassis proximal to a driving cab on both the left and the
right, wherein rear hydraulic support legs are mounted on the telescopic arm distal
from the driving cab on both the left and the right, wherein an auxiliary supporting
oil cylinder is provided on the truck chassis, with a piston rod extending vertically
upward, and wherein transitional hydraulic cylinders are mounted at the tail end of
the truck chassis on both the left and the right.
[0008] Furthermore, the working arm comprises a first fixed bracket having one end connected
to a second fixed bracket and the other end formed as a first opening, wherein a first
sliding bracket driven by a first power mechanism is slidingly mounted within the
first fixed bracket, with a counterweight mounted at the end of the first sliding
bracket extending out of the first opening, wherein the end of the second fixed bracket
distal from the first fixed bracket is provided with a second opening, and wherein
a second sliding bracket driven by a second power mechanism is slidingly mounted within
the second fixed bracket, with the working cage mounted at the end of the second sliding
bracket extending out of the second opening.
[0009] Furthermore, the second fixed bracket is mounted to the first fixed bracket by hinging
via a hinge shaft, and a locating pin driven by a third power mechanism is provided
between the second fixed bracket and the first fixed bracket.
[0010] Furthermore, a supporting arm is fixedly mounted at the end of the first fixed bracket
proximal to the second fixed bracket, and a supporting rope pulley is rotatably mounted
on the supporting arm, wherein a winch mechanism is provided at the first fixed bracket
proximal to the first opening, wherein a hoisting arm is provided on the second fixed
bracket, wherein a hoisting wire rope is provided among the winch mechanism, the supporting
rope pulley and the hoisting arm, and wherein the end of the hoisting arm distal from
a hoisting point of the hoisting wire rope is mounted to the second fixed bracket
by hinging.
[0011] Furthermore, a first stopper for restricting a vertical position of the hoisting
arm is provided on the second fixed bracket, and a second stopper for restricting
the hoisting point of the hoisting arm to be lower than an outer plane of the second
fixed bracket is provided on the second fixed bracket.
[0012] Furthermore, the telescopic arm comprises telescoping cylinders in a plurality of
stages sequentially nesting together, each stage of telescoping cylinder comprising
a plurality of telescoping sections nesting together, wherein each stage of telescoping
cylinder is connected with a hydraulic wire-rope lifter, where the hydraulic wire-rope
lifter connected to a first-stage telescoping cylinder is disposed within an outermost-layer
telescoping section, and the hydraulic wire-rope lifter connected to the next stage
of telescoping cylinder is disposed within an innermost-layer telescoping section
of the previous stage of telescoping cylinder, wherein the hydraulic wire-rope lifter
comprises a lifting hydraulic cylinder having a cylinder tube fixedly mounted at a
bottom of the corresponding telescoping section, wherein a fixed pulley set is mounted
on the cylinder tube of the lifting hydraulic cylinder, and a movable pulley set is
mounted on a piston rod of the lifting hydraulic cylinder, wherein a lifting wire
rope is provided between the lifting hydraulic cylinder and the corresponding telescoping
section, with one end fixed, and the other end wound through the movable pulley set
and the fixed pulley set before fixed on an innermost-layer telescoping section of
the corresponding stage of telescoping cylinder; wherein an outermost-layer telescoping
section of the next stage of telescoping cylinder is nested within an innermost-layer
telescoping section of the previous stage of telescoping cylinder, and in which a
tubing conveyer is mounted, for feeding fluid to the next stage of telescoping cylinder,
wherein the working cage is mounted on the top of the innermost-layer telescoping
section of a last-stage telescoping cylinder, and wherein the rear hydraulic support
legs are mounted on an outer surface of the outermost-layer telescoping section of
the first-stage telescoping cylinder.
[0013] Furthermore, a rope allocating pulley, for allocating the lifting wire rope of the
corresponding fixed pulley set to a corresponding position, is mounted both at the
bottom of the outermost-layer telescoping section of the first-stage telescoping cylinder
and the bottom of the innermost-layer telescoping section of the previous stage of
telescoping cylinder.
[0014] Furthermore, a through-wall pulley is mounted at the bottom of each telescoping section
other than the outermost-layer telescoping section of the first-stage telescoping
cylinder, wherein a bottom steering pulley is mounted both at the bottom inside of
the outermost-layer telescoping section of the first-stage telescoping cylinder and
at the bottom inside of the innermost-layer telescoping section of the previous stage
of telescoping cylinder, and wherein a top steering pulley is mounted at the top inside
of each telescoping section other than the innermost-layer telescoping section of
the last-stage telescoping cylinder.
[0015] Furthermore, the through-wall pulley traverses the corresponding telescoping section,
and the lifting wire rope is wound around the through-wall pulley for at least two
turns from outside of the corresponding telescoping section and then passes to inside
of the telescoping section.
[0016] Furthermore, the lifting wire rope of each stage of telescoping cylinder is wound
through the corresponding movable pulley set and fixed pulley set, then the corresponding
rope allocating pulley, the bottom steering pulley, the outermost-layer top steering
pulley, and the through-wall pulley of the neighbouring-layer telescoping section,
sequentially, and finally is fixed above the through-wall pulley of the innermost-layer
telescoping section.
[0017] Furthermore, a swing arm is provided between every two neighbouring telescoping sections,
with one end mounted to the outer-layer telescoping section by hinging, and the other
end provided with an inclined guide surface, wherein the end of the swing arm proximal
to the inclined guide surface is provided with a roller, wherein an adjusting screw
is threadedly connected to a flange on the top end of the outer-layer telescoping
section, with an end portion of the adjusting screw abutting against the inclined
guide surface, and wherein, under the action of the adjusting screw, an outer edge
of the roller abuts against an outer surface of the inner-layer telescoping section.
[0018] Furthermore, the tubing conveyer comprises a mounting bracket, on which a core-tube
driven by a fourth power mechanism is rotatably mounted, wherein the core-tube is
provided therein with a separator plate, which divides an inner cavity of the core-tube
into an inlet chamber and a return chamber, wherein an inlet duct communicating with
the inlet chamber is fixedly mounted on the core-tube, and a return duct communicating
with the return chamber is fixedly mounted on the core-tube, wherein the inlet chamber
is connected to an inlet line via a rotational joint, and the return chamber is connected
to the return line via another rotational joint, wherein a web plate is fixedly mounted
on an outer surface of the core-tube, with a dual-groove pulley disc fixedly mounted
on the web plate, and the core-tube, the web plate and the dual-groove pulley disc
are arranged co-axially, and wherein an inlet hose having an end connected to the
inlet duct and a return hose having an end connected to the return duct are coiled
within the dual-groove pulley disc, respectively.
[0019] Furthermore, a guide pulley is rotatably mounted on the mounting bracket, and a floating
pulley is disposed under the guide pulley, and wherein both the inlet hose and the
return hose are wound through the guide pulley and the floating pulley before connected
to the lifting hydraulic cylinder of the next stage of telescoping cylinder.
[0020] Furthermore, a first sensor and a second sensor are provided on the mounting bracket,
with the first sensor disposed under the guide pulley and above the floating pulley,
and the second sensor disposed under the floating pulley, and wherein both the first
sensor and the second sensor are connected to the fourth power mechanism.
[0021] Furthermore, a tension spring is provided between the floating pulley and the mounting
bracket, with one end of the tension spring fixed on the floating pulley, and the
other end thereof fixed on the mounting bracket.
[0022] Furthermore, the fourth power mechanism comprises an electric motor mounted on the
fixed bracket, and an outer gear ring is fixedly mounted on the web plate, and wherein
a transmission shaft is rotatably mounted on the mounting bracket, with one end of
the transmission shaft mounted with a drive gear meshing with the outer gear ring,
and the other end thereof in transmission connection with the electric motor.
[0023] The embodiments of the present invention offer the following advantages:
- (1) In the present invention, the rotary platform is mounted at the top end of the
telescopic arm and the working cage is mounted on the second sliding bracket, allowing
for adjustment of the angles, positions, and extending length of the working cage
based on the to-be-rescued object, and thus enabling a large turning radius of the
working cage, increasing the rescue radius, and expanding the application range of
the present invention. Moreover, by disposing the rotary platform on top, the rotational
momentum is small, so that a small-power electric motor can drive the rotary platform
to rotate, which significantly reduces energy consumption but greatly increases the
rotational speed and stability. The telescopic arm is hinged on the tail end of the
truck chassis, where in operation, the telescopic arm is turned to be vertical via
a turning hydraulic cylinder, so that the bottom of the telescopic arm is close to
the ground, which, compared with the conventional construction having the crank arm
above the truck chassis, the present invention lowers the gravitational centre of
the telescopic arm and increases stability of the telescopic arm. The vertical elevating
of the telescopic arm makes the telescopic height equal to the rescue height.
- (2) Provision of the transitional hydraulic cylinder overcomes the instability issue
during turning of the telescopic arm, offering operational stability of the embodiments
of the present invention.
- (3) Since the second fixed bracket is mounted on the first fixed bracket by hinging
via the hinge shaft, the second fixed bracket is enabled to turn about the hinge shaft,
which realizes folding transport and reduces footprint.
- (4) The present invention utilizes one lifting hydraulic cylinder to elevate a plurality
of telescoping sections, which not only decreases the number of lifting hydraulic
cylinders in use and reduces manufacturing cost, but also saves mounting space, so
that more telescoping sections may be arranged to increase the telescoping length,
thereby addressing the technical problem that the current telescopic arm of a telescopic
cylinder structure is restricted from further increasing height due to the transmission
manner of hydraulic cylinder. In addition, the present invention enables to maximize
the cross-sectional area of the telescoping sections, and thus increase their stability
during telescoping.
- (5) Due to the fact that a through-wall pulley is provided at the bottom of each telescoping
section, the lifting wire rope is wound around the through-wall pulley for at least
turns from the outside of the corresponding telescoping section and then passes to
the inside of the telescoping section, the groove width of the through-wall pulley
is only the diameter of three turns of lifting wire rope, and the pulley width direction
is consistent with the steel plate thickness direction of the telescoping section,
the inner space of the telescoping section is saved as much as possible, the utilization
of the effective cross-sectional area of the telescoping section is increased, and
a force is exerted from bottom when the telescoping section is hoisted by the lifting
wire rope, so that each telescoping section is evenly acted upon by a force during
lifting, resulting in a more stable lifting of telescoping sections.
- (6) The present invention adopts a vertically lifting telescopic arm structure with
the working cage mounted on the second sliding bracket, whereby the embodiments of
the present invention enable a long-distance rescue radius throughout the whole telescoping
range of the telescopic arm, thereby preventing occurrence of rescue blind area.
Brief Description of the Accompanying Drawings
[0024] To illustrate the technical solutions in the embodiments of the present invention
or in the art, the drawings used in the description of the embodiments or the art
would be briefly introduced below. Apparently, the drawings illustrated
infra are only exemplary, to a person in the art, other drawings may be derived based on
those provided without any inventive efforts.
[0025] The structures, scales, and sizes as illustrated herein are only provided for those
familiar with such technology to understand and read in conjunction with the contents
disclosed in the specification, not intended to limit implementable and restrictive
conditions of the present invention, and thus have no technically substantive implications.
Any modifications on structure, variation on scale or adjustments on size, without
affecting the effect or objective achievable by the present invention, shall still
fall within the scope covered by the technical contents disclosed in the present invention.
Fig. 1 is a structural diagram according to embodiments of the present invention;
Fig. 2 is a status schematic diagram of a telescopic arm during turning according
to embodiments of the present invention;
Fig. 3 is a status schematic diagram of the telescopic arm after turned according
to embodiments of the present invention;
Fig. 4 is a structural schematic diagram of the connection between a counterweight
and a working cage according to embodiments of the present invention;
Fig. 5 is a sectional structural schematic diagram taken along A-A inFig.4;
Fig. 6 is a structural schematic diagram of a telescopic arm according to embodiments
of the present invention;
Fig. 7 is a structural schematic diagram of the winding of a lifting wire rope of
a first-stage telescoping cylinder according to embodiments of the present invention;
Fig. 8 is a structural schematic diagram of an outermost-layer telescoping section
in Fig. 7;
Fig. 9 is a sectional structural schematic diagram taken along B-B in Fig. 8;
Fig. 10 is a sectional structural schematic diagram taken along C-C in Fig. 8;
Fig. 11 is a schematic diagram of a winding relationship of the lifting wire rope
between two neighbouring telescoping sections according to embodiments of the present
invention;
Fig. 12 is a structural schematic diagram of a connection between two neighbouring
telescoping sections according to embodiments of the present invention;
Fig. 13 is a structural schematic diagram taken along D-D in Fig. 12;
Fig. 14 is an enlarged structural schematic diagram of E in Fig. 12;
Fig. 15 is a structural schematic diagram of a tubing conveyer according to embodiments
of the present invention;
Fig. 16 is a structural schematic diagram taken along F-F in Fig. 15;
Fig. 17 is a hydraulic principle diagram of a hydraulic support leg according to embodiments
of the present invention;
Fig. 18 is a structural schematic diagram of the hydraulic support leg according to
embodiments of the present invention;
[0026] in the drawings: 1. truck chassis; 2. telescopic arm; 3. first-stage telescoping
cylinder; 202. second-stage telescoping cylinder; 203. last-stage telescoping cylinder;
204. hydraulic wire-rope lifter; 20401. outermost-layer telescoping section; 20402.
sub-outermost-layer telescoping section; 20403. innermost-layer telescoping section;
20404: lifting wire rope; 20405: rope allocating pulley; 20406. bottom steering pulley;
20407. top steering pulley; 20408. through-wall pulley; 20409. lifting hydraulic cylinder;
20410. movable pulley set; 20411. fixed pulley set; 20412. flange; 20413. swing arm;
20414. inclined guide surface; 20415. adjusting screw; 20416. locking nut; 20417.
inner stopper; 20418. roller; 20419. outer stopper; 205. tubing conveyer; 20501. mounting
bracket; 20502. dual-groove pulley disc; 20503. guide pulley; 20504. floating pulley;
20505. first sensor; 20506. second sensor; 20507. tension spring; 20508. core-tube;
205081. inlet chamber; 205082. return chamber; 20509. separator plate; 20510. inlet
duct; 20511. return duct; 20512. web plate; 20513. inlet hose; 20514. return hose;
20515. electric motor; 20516. transmission shaft; 20517. outer gear ring; 20518: drive
gear; 3. working cage; 4. front hydraulic support leg; 5. turning hydraulic cylinder;
6. rear hydraulic support leg; 7. transitional hydraulic cylinder; 8. rotary platform;
9. first fixed bracket; 10. first sliding bracket; 11. counterweight; 12. first electric
motor; 13. first drive sprocket; 14. first driven sprocket; 15. first chain; 16. second
electric motor; 17. second drive sprocket; 18. second driven sprocket; 19. second
chain; 20. second fixed bracket; 21. second sliding bracket; 22. hinge shaft; 23.
locating pin; 24. supporting arm; 25. supporting rope pulley; 26. winch mechanism;
27. hoisting arm; 28. hoisting wire rope; 29. first stopper; 30. second stopper; 31.
second connecting plate; 32. horizontal oil cylinder; 3201. first cylinder tube; 3202.
second cylinder tube; 3203. third cylinder tube; 3204. plunger piston; 3205. first
central barrel; 3206. second central barrel; 3207. third central barrel; 3208. through-port;
3209. horizontal first actuator port; 3210. horizontal second actuator port; 33. vertical
oil cylinder; 3301. first sleeve; 3302. second sleeve; 3303. third sleeve; 3304. fourth
sleeve; 3305: fifth sleeve; 3306: sixth sleeve; 34. inlet line; 35. return line; 36.
first directional valve; 37. second directional valve; 38. first hydraulic control
check valve; 39. second hydraulic control check valve; 40. tilt sensor; 41. auxiliary
support oil cylinder.
Detailed Description of the Embodiments of the Present Invention
[0027] Hereinafter, the embodiments of the present invention will be described by means
of specific implementations, and those familiar with such technology may readily understand
other advantages and effects of the present invention from the contents disclosed
herein. Apparently, the implementations as described are only some implementations
of the present invention, not all of them. All other implementations derived by those
skilled in the art based on the implementations described herein without exercise
of inventive work fall within the scope of the present invention.
[0028] The terms such as "front," "rear," "left," "right," "middle," "upper," and "lower"
referred to herein only are served for a clear description, not intended to limit
the implementable scope of the present invention, and therefore change or adjustment
of relative positions or relationships without substantive alternation to the technical
contents should also be deemed as falling within the scope of the present invention.
[0029] As illustrated in Fig. 1, Fig. 3, and Fig. 4 in combination, embodiments of the present
invention provide a multi-stage hydraulic multiplication pulley vertical lifting-type
elevating platform fire truck, which comprises a truck chassis 1, to the tail of which
a telescopic arm 2 is mounted by hinging, with the length from the hinging point therebetween
to the bottom of the telescopic arm 2 smaller than or equal to the height of the truck
chassis 1, so as to ensure that the telescopic arm 2 is turnable to a vertical position.
A rotary platform 8 is provided on the top end of the telescopic arm 2, and a working
arm is mounted on the rotary platform 8, with one end provided with a working cage
3. The working arm comprises a first fixed bracket 9 with one end connected to a second
fixed bracket 20 and the other end formed as a first opening. A first sliding bracket
10 driven by a first power mechanism is slidingly mounted within the first fixed bracket
9, with a counterweight 11 mounted at the end of the first sliding bracket 10 extending
out of the first opening. The end of the second fixed bracket 20 distal from the first
fixed bracket 9 is provided with a second opening. A second sliding bracket 21 driven
by a second power mechanism is slidingly mounted within the second fixed bracket 20.
A working cage 3 is mounted at the end of the second sliding bracket 21 extending
out of the second opening. Both the first fixed bracket 9 and the second fixed bracket
20 are of a square barrel-shaped structure and generally formed of steel beams by
welding. Also, the first sliding bracket 10 and the second sliding bracket 21 are
also of a square barrel-shaped structure formed by welding, with sectional profiles
fitted with those of the inside of the first fixed bracket 9 and the second fixed
bracket 20, respectively. A turning hydraulic cylinder 5 is mounted on the truck chassis
1, with one end mounted on the truck chassis 1 by hinging, the other end thereof mounted
on the telescopic arm 2 by hinging. When in a vertical state, the hinging point between
the turning hydraulic cylinder 5 and the telescopic arm 2 is higher than the hinging
point between the telescopic arm 2 and the truck chassis 1, which not only reduces
the height of gravitational centre and enhances stability, but also enables vertical
lifting of the telescopic arm 2, so that the maximum telescopic length becomes the
maximum rescue height. Front hydraulic support legs 4 are mounted on the truck chassis
1 proximal to a driving cab of the truck on both the left and the right, and rear
hydraulic support legs 6 are mounted on the telescopic arm 2 distal from the driving
cab of the truck on both the left and the right. An auxiliary support oil cylinder
41 is provided on the truck chassis 1, and a piston rod of the auxiliary support oil
cylinder 41 extends vertically upwards to lift and bear the telescopic arm 2. The
auxiliary support oil cylinder 41 first lifts the telescopic arm 2 to a certain height,
and then the turning hydraulic cylinder 5 turns the telescopic arm 2 to be in a vertical
state, which reduces a mounting tilt angle of the turning hydraulic cylinder 5 and
saves height space above the truck chassis 1.
[0030] When the telescopic arm 2 is disposed on the truck chassis 1 horizontally, a mounting
angle between an axis of the turning hydraulic cylinder 5 and the truck chassis 1
is smaller than 5 degrees, and the piston rod of the auxiliary support oil cylinder
41 abuts against the telescopic arm 2; with such structure, the height space above
the truck chassis 1 occupied by the turning hydraulic cylinder 5 is significantly
reduced, so that the limited height space above the truck chassis 1 is utilized for
the cross-sectional area of the telescopic arm 2 as much as possible to maximize the
effective rescue height of the telescopic arm 2.
[0031] As illustrated in Fig. 2, during the turning of the turning hydraulic cylinder 5,
the rear hydraulic support legs 6 mounted on the telescopic arm 2 have not been supported
on the ground yet, and it is hard for the truck to maintain balanced and stable only
with the two front support legs 4 on the left and the right. Therefore, in order to
address the instability issue during turning of the telescopic arm 2, the inventors
of the present application have conducted an in-depth study to work out a technical
solution of mounting a transitional hydraulic cylinder 7 at the tail end of the truck
chassis 1on both the left and the right.
[0032] As illustrated in Fig. 4, the first power mechanism comprises a first drive sprocket
13 which is rotatably mounted on the first fixed bracket 9 at the end proximal to
the second fixed bracket 20 and driven by a first electric motor 12, a first driven
sprocket 14 which is rotatably mounted at the other end of the first fixed bracket
9, proximal to the first opening, and a first chain 15 surrounding the first drive
sprocket 13 and the first driven sprocket 14 therebetween. A first connecting plate
is fixedly mounted on the first chain 15. One end of the first connecting plate is
fixed to the first chain 15, and the other end thereof is fixed to the first sliding
bracket 10, so that the forward and reverse rotation of the first electric motor 12
brings the first sliding bracket 10 to reciprocally slide, enabling the movement of
the counterweight 11 for balancing the working cage 3. Certainly, a pulley-slides
assembly may be arranged between the first fixed bracket 9 and the first sliding bracket
10 to effect a smoother sliding.
[0033] As illustrated in Figs. 4 and 5, the second power mechanism comprises a second drive
sprocket 17 which is rotatably mounted on the second fixed bracket 20 at the end proximal
to the first fixed bracket 9 and driven by a second electric motor 16, a second driven
sprocket 18 which is rotatably mounted the other end of the second fixed bracket 20,
proximal to the second opening, and a second chain 19 surrounding the second drive
sprocket 17 and the second driven sprocket 18 therebetween. A second connecting plate
31 is fixedly mounted on the second chain 19. One end of the second connecting plate
31 is fixed to the second chain 19, and the other end thereof is fixed to the second
sliding bracket 21, so that the forward and reverse rotation of the second electric
motor 16 brings the second sliding bracket 21 to reciprocally slide, enabling the
movement of the working cage 3 for approaching a to-be-rescued object. Certainly,
a pulley-slides assembly may be arranged between the second fixed bracket 20 and the
second sliding bracket 21 to effect a smoother sliding.
[0034] The second fixed bracket 20 is mounted to the first fixed bracket 9 by hinging via
a hinge shaft 22, so that the second fixed bracket 20 is turnable around the hinge
shaft 22, enabling folding-transport and reducing space occupation. A locating pin
23 driven by a third power mechanism is provided between the second fixed bracket
20 and the first fixed bracket 9. In normal operation, the locating pin 23 is capable
of connecting the first fixed bracket 9 with the second fixed bracket 20. The third
power mechanism is generally a pneumatic cylinder, a hydraulic cylinder, or an electric
drive pusher.
[0035] A supporting arm 24 is fixedly mounted on the first fixed bracket 9 at the end thereof
proximal to the second fixed bracket 20. A supporting rope pulley 25 is rotatably
mounted on the supporting arm 24, and projects beyond the outer plane of the second
fixed bracket 20. A winch mechanism 26 is provided at the first fixed bracket 9 proximal
to the first opening. A hoisting arm 27 is provided on the second fixed bracket 20.
The hoisting point of the hoisting arm 27 projects beyond the outer plane of the second
fixed bracket 20 but is lower than the supporting rope pulley 25 in height. A hoisting
wire rope 28 is arranged among the winch mechanism 26, the supporting rope pulley
25, and the hoisting arm 27. One end of the hoisting wire rope 28 is fixed to the
winch mechanism 26, and the other end thereof is fixed to the hoisting point of the
hoisting arm 27 after wound around the supporting rope pulley 25 tightly, so that,
with the winching power, the second fixed bracket 20 is gradually pulled towards the
first fixed bracket 9 around the hinge shaft 22. Once the second fixed bracket 20
is joined with the first fixed bracket 9 together, the third power mechanism pushes
the locating pin 23 to connect the first fixed bracket 9 with the second fixed bracket
20. The winch mechanism 26 is known to those skilled in the art, and available to
purchase and use as per the model needed, and thus not detailed here.
[0036] The end of the hoisting arm 27 distal from the hoisting point of the hoisting wire
rope 28 is mounted to the second fixed bracket 20 by hinging. When in transport, the
hoisting arm 27 may be turned below the outer plane of the second fixed bracket 20
to prevent overheight. A first stopper 29 for restricting the vertical position of
the hoisting arm 27 is arranged on the second fixed bracket 20. The first stopper
20 has the function of blocking during lifting. A second stopper 30 for restricting
the hoisting point of the hoisting arm 27 to be lower than the outer plane of the
second fixed bracket 20 is arranged on the second fixed bracket 20. The second stopper
30 has the function of blocking during transportation.
[0037] During transportation, as illustrated in Fig. 1, the telescopic arm 2 is disposed
on the truck chassis 1 horizontally, the first sliding bracket 10 is retracted within
the first fixed bracket 9, the rotary platform 8 and the first fixed bracket 9 are
mounted at the top of the telescopic arm 2, the locating pin 23 is released, the second
fixed bracket 20 is then turned to the side surface of the telescopic arm 2 so as
to be just at the top plane of the truck, and the hoisting arm 27 is then turned to
the second stopper 30 so as to be hidden below the outer plane of the second fixed
bracket 20. As such, the overall structure is compact with reduced footprint.
[0038] As illustrated in Fig. 6, the telescopic arm 2 comprises telescoping cylinders in
a plurality of stages sequentially nesting together, each stage of telescoping cylinder
comprising a plurality of telescoping sections nesting together. Each stage of telescoping
cylinder is connected with a hydraulic wire-rope lifter 204. The hydraulic wire-rope
lifter 204 connected to the first-stage telescoping cylinder 201 is disposed within
an outermost-layer telescoping section 20401, and the hydraulic wire-rope lifter 204
connected to the next stage of telescoping cylinder is disposed in an innermost-layer
telescoping section 20403 of the previous stage of telescoping cylinder. As illustrated
in Fig. 7, Fig. 8, Fig. 9, and Fig. 10 in combination, the hydraulic wire-rope lifter
204 comprises a lifting hydraulic cylinder 20409 with a cylinder tube fixedly mounted
at the bottom of an inner space of the corresponding telescoping section. A fixed
pulley set 20411 is mounted on the cylinder tube of the lifting hydraulic cylinder
20409, and a movable pulley set 20410 is mounted on a piston rod of the lifting hydraulic
cylinder 20409. A lifting wire rope 20404 is provided between the lifting hydraulic
cylinder 20409 and the corresponding telescoping section. One end of the lifting wire
rope 20404 is fixed, and this fixed end is generally the position for fixing to the
cylinder tube of the lifting hydraulic cylinder 20409 or the outermost-layer telescoping
section 20401. The other end of the lifting wire rope 20404 is wound through the movable
pulley set 20410 and the fixed pulley set 20411 before fixed on the innermost-layer
telescoping section 20403 of the corresponding stage of telescoping cylinder. The
number of the movable pulleys in the movable pulley set 20410 and the fixed pulleys
in the fixed pulley set 20411 may be set by those skilled in the art based on the
number of telescoping sections, in such a manner that the stroke of the lifting hydraulic
cylinder 20409 fixed within the outermost-layer telescoping section 20401 may enable
all telescoping sections to telescope, i.e., the lifting hydraulic cylinder 20409
of the length of one telescoping section may enable all telescoping sections to telescope.
For example, in the case that there are six telescoping sections in total, three movable
pulleys are provided in the movable pulley set 20410 and three fixed pulleys are provided
in the fixed pulley set 20411. One end of the lifting wire rope 20404 is fixed to
the fixing position of the cylinder tube of the lifting hydraulic cylinder 20409,
and the other end thereof is wound through the movable pulleys and fixed pulleys sequentially,
and then is fixed on the innermost-layer telescoping section 20403. Such three-stage
movable pulley construction provides a transmission ratio of 1:6, i.e., if the piston
rod of the lifting hydraulic cylinder 20409 has a telescopic length of 1 meter, the
telescoping sections may move a distance of 6 meters, such that a hydraulic cylinder
with a stroke of 8 meters will enable telescoping sections with a 48-meter telescopic
length. In this way, a rescue height of 144 meters may be achieved by connecting in
series three stages of telescoping cylinders, where each stage of telescopic arm 2
has a telescopic length of 48 meters. By increasing the transmission ratio, the length
of telescoping sections, or the stroke of lifting hydraulic cylinder 20409, the rescue
height may be further increased to be far more than the current maximum rescue height
of 112 meters, thereby overcoming the technical problem that the elevating height
of the telescopic arm 2 with the telescoping cylinder structure is largely limited
by the transmission manner of the lifting hydraulic cylinder 20409. The outermost-layer
telescoping section 20401 of the next stage of telescoping cylinder is nested within
the innermost-layer telescoping section 20403 of the previous stage of telescoping
cylinder, and a tubing conveyer 205 for supplying the hydraulic fluid to the next
stage of telescoping cylinder is mounted within the innermost-layer telescoping section
20403 of the previous stage of telescoping cylinder.
[0039] A rope allocating pulley 20405 for allocating the lifting wire rope 20404 of the
corresponding fixed pulley set 20411 to corresponding position is mounted at the bottom
of the outermost-layer telescoping section 20401 of the first-stage telescoping cylinder
201 and the bottom of the innermost-layer telescoping section 20403 of the previous
stage of telescoping cylinder, respectively. Taking the telescopic arm 2 with a square-shaped
cross section as an example, it is generally needed to arrange the hoisting points
in all four directions, then the rope allocating pulley 20405 needs a four-groove
construction, so as to allocate four lifting wire ropes 20404 to four different sidewalls,
respectively, ensuring synchronization and balance during lifting of each telescoping
section.
[0040] A through-wall pulley 20408 is mounted at the bottom of each of telescoping sections
other than the outermost-layer telescoping section 20401 of the first-stage telescoping
cylinder 201. As illustrated in Fig. 11, the through-wall pulley 20408 is rotatably
mounted on the corresponding telescoping section via a bearing housing, and a through
hole is formed on such telescoping section at a position corresponding to the through-wall
pulley 20408, for the passing thereof. A bottom steering pulley 20406 is mounted at
the bottom inside of the outermost-layer telescoping section 20401 of the first-stage
telescoping cylinder 201 and at the bottom inside of the innermost-layer telescoping
section 20403 of the previous stage of telescoping cylinder, respectively. A top steering
pulley 20407 is mounted at the top inside of each telescoping section other than the
innermost-layer telescoping section 20403 of the last-stage telescoping cylinder 203.
The through-wall pulley 20408 traverses the corresponding telescoping section. The
groove width of the through-wall pulley 20408 is only the diameter of about three
turns of lifting wire ropes 20404, and the pulley width direction is consistent with
the steel plate thickness direction of the telescoping section, which saves the inner
space of the telescoping section as much as possible and increases utilization of
the effective cross-sectional area of the telescoping sections. The lifting wire rope
20404 is wound around the through-wall pulley 20408 for at least two turns from the
outside of the corresponding telescoping section, and then passes to the inside of
the telescoping section. The number of turns of the winding may be set based on the
wall plate thickness of the telescoping section and the thickness of the lifting wire
rope 20404. Since the diameter of the lifting wire rope 20404 is generally larger
than the wall plate thickness of the telescoping section, after wound for two turns,
the lifting wire rope 20404 will pass to the inside from the outside of the telescoping
section. By such winding of the lifting wire rope 20404, a force is exerted from bottom
when the telescoping section is hoisted by the lifting wire rope 20404, so that each
telescoping section is evenly acted upon by a force during lifting, resulting in a
more stable lifting of telescoping sections.
[0041] The lifting wire rope 20404 of each stage of telescoping cylinder is wound through
the corresponding movable pulley set 20410 and fixed pulley set 20411, and then wound
through the corresponding rope allocating pulley 20405, the bottom steering pulley
20406, the outermost-layer top steering pulley 20407, and the through-wall pulley
20408 of the neighbouring-layer telescoping section, and is finally fixed above the
through-wall pulley 20408 of the innermost-layer telescoping section 20403. Specifically,
the outermost-layer telescoping section 20401 of the first-stage telescoping cylinder
201 is fixed, and the lifting wire rope 20404, after passing over the rope allocating
pulley 20405, is wound through the bottom steering pulley 20406, upward to the top
steering pulley 20407 of the outermost-layer telescoping section 20401, downward to
the through-wall pulley 20408 of the sub-outermost-layer telescoping section 20402,
and the lifting wire rope 20404 is now located outside of the sub-outermost-layer
telescoping section 20402. Then the lifting wire rope 20404 is wound around the through-wall
pulley 20408 for two turns, passing through the through-hole on the sub-outermost-layer
telescoping section 20402 and to the inside of the sub-outermost-layer telescoping
section 20402, further upward to the top steering pulley 20407 of the sub-outermost-layer
telescoping section 20402, toward the through-wall pulley 20408 of the further-inner-layer,
and by winding sequentially in this way, to the through-wall pulley 20408 of the innermost-layer
telescoping section 20403, and finally passing to the inside of the innermost-layer
telescoping section 20403, with the end fixed above the through-wall pulley 20408
of the innermost-layer telescoping section 20403. A hydraulic wire-rope lifting lifter
204 for lifting a second-stage telescoping cylinder 202 is provided within the innermost-layer
telescoping section 20403 of the first-stage telescoping cylinder 201. The lifting
wire rope 20404 at that position, after passing over the rope allocating pulley 20405,
is wound through the bottom steering pulley 20406, upward to the top steering pulley
20407 of the innermost-layer telescoping section 20403 of the first-stage telescoping
cylinder 201, downward to the through-wall pulley 20408 of the outermost-layer telescoping
section 20401 of the second-stage telescoping cylinder 202, and the lifting wire rope
20404 is now located at the outside of the outermost-layer telescoping section 20401
of the second-stage telescoping cylinder 202. Then the lifting wire rope 20404 is
wound around the through-wall pulley 20408 for two turns, passing through the through-hole
on the outermost-layer telescoping section 20401 of the second-stage telescoping cylinder
202 and to the inside of the outermost-layer telescoping section 20401 of the second-stage
telescoping cylinder 202, further upward to the top steering pulley 20407 of the outermost-layer
telescoping section 20401 of the second-stage telescoping cylinder 202, toward the
through-wall pulley 20408 of the inner-layer telescoping section of the second-stage
telescoping cylinder 202, and by winding sequentially in this way to the through-wall
pulley 20408 of the innermost-layer telescoping section 20403, and finally passing
to the inside of the second-stage innermost-layer telescoping section 20403, with
the end fixed above the through-wall pulley 20408 of the innermost-layer telescoping
section 20403. By analogy, wire rope hydraulic lifting of all stages of telescoping
cylinders is realized.
[0042] As illustrated in Fig. 12, Fig. 13, and Fig. 14 in combination, a flange 20412 is
disposed on the top end of each telescoping section. An inner-layer telescoping section
passes through the flange 20412 on the top end of an outer-layer telescoping section.
The gap between a flange bore on the top end of the outer-layer telescoping section
and the outer surface of the inner-layer telescoping section is formed as a sliding
gap. A swing arm 20413 is provided between every two neighbouring telescoping sections.
One end of the swing arm 20413 is mounted on an outer-layer telescoping section by
hinging, and the other end thereof is provided with an inclined guide surface 20414,
with which the symmetrical central surface of the swing arm 20413 forming an acute
angle. A roller 20418 is provided at the end of the swing arm 20413 proximal to the
inclined guide surface 20414, and the rotational centre of the swing arm 20413 is
parallel to the rotational centre of the roller 20418. An adjusting screw 20415 is
threaded to the flange 20412 on the top end of the outer-layer telescoping section,
an end portion of the adjusting screw 20415 abutting against the inclined guide surface
20414, and due to the adjusting screw 20415, the outer edge of the roller 20418 abuts
against the outer surface of the inner-layer telescoping section to reduce a gap for
wobble between two neighbouring telescoping sections, ensuring that the inner-layer
telescoping section is more stable during telescoping.
[0043] The telescoping sections have a square-shaped cross section, and each telescoping
section is of a square barrel-shaped structure enclosed by four square plates. The
square-shaped cross section of the telescoping sections avoids rotation during telescoping
with improved stability.
[0044] At least two spaced groups of rollers 20418 are provided to abut against each panel
of the inner-layer telescoping section, with the rollers 20418 located at corners
of the corresponding telescoping sections, respectively. If the panel has a large
breadth, more groups of rollers 20418 may be arranged; and corresponding rollers 20418
may be arranged at the corners and middle of the telescoping section to ensure that
the inner-layer telescoping section is more stable during telescoping.
[0045] A locking nut 20416 is provided between the adjusting screw 20415 and the flange
20412. When the outer edge of the roller 20418 abuts against the outer surface of
an inner-layer telescoping section, the locking nut 20416 is tightened, so that an
end face of the locking nut 20416 abuts against an end face of the flange 20412, and
thus avoiding looseness of the adjusting screw 20415 during telescoping of the telescoping
section which causes the inner-layer telescope to create a too large gap for wobble.
[0046] An inner stopper 20417 is provided on an outer surface of the bottom of the inner-layer
telescoping section; with the gap between the inner stopper 20417 and the inner surface
of the outer-layer telescoping section adjusted to be smaller than the sliding gap.
Correspondingly, an outer stopper 20419 is provided on an inner surface of the top
of the outer-layer telescoping section, and likewise, with the gap between the inner
stopper 20417 and the inner surface of the outer-layer telescoping section adjusted
to be smaller than the sliding gap, so that the inner-layer telescoping section is
more stable during telescoping. At least one group consisting of the inner stopper
20417 and the outer stopper 20419 is provided on each panel of the inner-layer telescoping
section. Those skilled in the art may select the number of inner stoppers 20417 and
outer stoppers 20419 used on each panel and arrange the mounting positions of the
inner stoppers 20417 and outer stoppers 20419, dependent on the breadth size of the
panels of the telescoping sections, which will not be detailed here. The upper surfaces
of all inner stoppers 20417 are on the same horizontal plane, and the lower surfaces
of all outer stoppers 20419 are on the same horizontal plane. When the inner stopper
20417 comes into contact with the outer stopper 20419, the inner-layer telescoping
section has a coaxiality consistent with the outer-layer telescoping section, which
ensures perpendicularity of the telescoping section during normal operation and further
enhances operational performance of the present invention.
[0047] In the embodiments of the present invention, a swing arm 20413 is provided at the
outer-layer telescoping section proximal to and abutting the flange 20412, and a roller
20418 is provided on the swing arm 20413. The adjusting screw 20415 abuts against
the swing arm 20413, thereby the outer edge of the roller 20418 abuts against the
outer surface of the inner-layer telescoping section, reducing the sliding gap between
the neighbouring telescoping sections. Further, an inner stopper 20417 is placed at
a bottom of the inner-layer telescoping section, so that the inner-layer telescoping
section is more stable during telescoping. Meanwhile, the outer stopper 20419 on one
hand has the function of position limiting, which effectively prevents runout of the
inner-layer telescoping section. On the other hand, the consistency between axes of
the inner-layer telescoping section and outer-layer telescoping section can be ensured,
when the inner-layer telescoping section extends to its maximum length, i.e., when
the inner stopper 20417 abuts against the outer stopper 20419, and thus this structure
enables vertical elevation with high stability, so that the maximum rescue height
of the telescopic arm 2 is equal to its own telescopic length.
[0048] As illustrated in Figs. 15 and 16, the tubing conveyer 205 comprises a mounting bracket
20501, on which a core-tube 20508 driven by a fourth power mechanism is rotatably
mounted via a bearing housing. A separator plate 20509 is provided within the core-tube
20508, and divides an inner cavity of the core-tube 20508 into an inlet chamber 205081
and a return chamber 205082 which cannot communicate with each other. An inlet duct
20510 communicating with the inlet chamber 205081 is fixedly mounted on the core-tube
20506, and a return duct 20511 communicating with the return chamber 205082 is fixedly
mounted on the core-tube 20508. Both the inlet duct 20510 and the return duct 20511
extend out of the outer surface of the core-tube 20508. The inlet chamber 205081 is
connected to an inlet line 34 via a rotational joint, and the return chamber 205082
is connected to the return line 35 via another rotational joint. A web plate 20512
is fixedly mounted on the outer surface of the core-tube 20508, and a dual-groove
pulley disc 20502 is fixedly mounted on the web plate 20512. The core-tube 20508,
the web plate 20512, and the dual-groove pulley disc 20502 are co-axially arranged.
An inlet hose 20513 and an return hose 20514 are coiled in the dual-groove pulley
disc 20502, respectively. The inlet hose 20513 and the return hose 20514 are both
of a high-pressure hose. The inlet hose 20513 has one end connected to the inlet duct
20510, and the return hose 20514 has one end connected to the return duct 20511. To
save mounting space, the web plate 20512 is designed as a hollow cavity structure,
with both the inlet duct 20510 and the return duct 20511 passing into the hollow cavity
of the web plate 20512. The ends of the inlet hose 20513 and the return hose 20514
coiled in the innermost circle of the dual-groove pulley disc 20502 pass into the
hollow cavity of the web plate 20512 and connected to the inlet duct 20510 and the
return duct 20511, respectively.
[0049] A guide pulley 20503 is rotatably mounted on the mounting bracket 20501 and usually
provided with dual grooves, corresponding to the dual-groove pulley disc 20502, so
as to lead out the inlet hose 20513 and the return hose 20514, respectively. A floating
pulley 20504 is disposed below the guide pulley 20503; and likewise, also provided
with dual grooves. Both the inlet hose 20513 and the return hose 20514 are wound through
the guide pulley 20503 and the floating pulley 20504 before connected to the lifting
hydraulic cylinder 20409 of the next stage of telescoping cylinder. The floating pulley
20504 falls, under the gravitational force, on the inlet hose 20513 and a outlet hose
to tension the inlet hose 20513 and the outlet hose, which enables stable releasing
or coiling of the inlet hose 20513 and the return hose 20514; without affecting on
the lifting of the telescopic arm 2 due to the inconstant linear speed of the inlet
hose 20513 and the return hose 20514 on the dual-groove pulley disc 20502.
[0050] A first sensor 20505 and a second sensor 20506 are provided on the mounting bracket
20501. The first sensor 20505, disposed below the guide pulley 20503 and above the
floating pulley 20504, and the second sensor 20506, disposed below the floating pulley
20504, are both connected to the fourth power mechanism. The first sensor 20505 is
configured to detect an upper limit position of the floating pulley 20504, and the
second sensor 20506 is configured to detect a lower limit position of the floating
pulley 20504. When the first sensor 20505 detects the floating pulley 20504, the fourth
power mechanism is activated to bring the dual-groove pulley disc 20502 to rotate
to release the coiled inlet hose 20513 and return hose 20514. When the second sensor
20506 detects the floating pulley 20504, the fourth power mechanism is deactivated.
[0051] A tension spring 20507 is disposed between the floating pulley 20504 and the mounting
bracket 20501. One end of the tension spring 20507 is fixed on the floating pulley
20504, and the other end thereof is fixed on the mounting bracket 20501, whereby a
pretension force may be applied against the inlet hose 20513 and the return hose 20514,
which presents the floating pulley 20504 from moving upward too fast or from moving
too long and thus going beyond the detection range of the first sensor 20505.
[0052] The fourth power mechanism comprises an electric motor 20515 mounted on the fixed
bracket. An outer gear ring 20517 is fixedly mounted on the web plate 20512, and a
transmission shaft 20516 is rotatably mounted on the mounting bracket 20501. The transmission
shaft 20516 is mounted with a drive gear 20518 in mesh with the outer gear ring 20517
at one end, and is in transmission connection with the electric motor 20515 at the
other end. The rotation of the transmission shaft 20516 brings the web plate 20512
to rotate, and thus bringing the core-tube 20508 to rotate with the dual-groove pulley
disc 20502, which enables releasing and coiling of the inlet hose 20513 and the return
hose 20514. The electric motor 20515 and the transmission shaft 20516 are connected
via chain transmission, and certainly, belt transmission or gear transmission is also
possible, which may be discretionally set by those skilled in the art dependent on
space need and is thus not detailed here.
[0053] Certainly, to simplify the structure, the tubing conveyer 205 may also adopt another
technical solution. Specifically, the tubing conveyer 205 comprises a pulley disc
driven by a torque motor or a servo motor, with the tubing coiled thereon to enable
delivery stage by stage.
[0054] As illustrated in Fig. 17, each hydraulic support leg includes a vertical oil cylinder
33 with axis arranged vertically and a horizontal oil cylinder 32. The cylinder tube
of the vertical oil cylinder 33 is mounted on the piston rod of the horizontal oil
cylinder 32. The horizontal oil cylinder 32 has a rodless cavity communicating with
port A of the first directional valve 36, and a rod cavity communicating with port
B of the first directional valve 36. The first directional valve 36 has a port P communicating
with the inlet line 34, and a port T communicating with the return line 35. The vertical
oil cylinder 33 has a rodless cavity connected to port A of the second directional
valve 37 via a first hydraulic control check valve 38, and a rod cavity connected
to port B of the second directional valve 37 via a second hydraulic control check
valve 39. The hydraulic control line of the second hydraulic control check valve 39
communicates with port A of the second directional valve 37, and the hydraulic control
line of the first hydraulic control check valve 38 communicates with port B of the
second directional valve 37. The first hydraulic control check valve 38 and the second
hydraulic control check valve 39 can maintain current pressure of the vertical oil
cylinder 33, thereby preventing leakage of hydraulic fluid due to load-bearing change
and stabilizing output of the piston rod of the vertical oil cylinder 33. The second
directional valve 37 is connected to a tilt sensor 40. The second directional valve
37 has a port P communicating with the inlet line 34, and a port T communicating with
the return line 35. The first directional valve 36 is a 3-position, 4-way O-type solenoid
directional valve, and the second directional valve 37 is a 3-position, 4-way Y-type
solenoid directional valve. Specifically, the solenoid coil of the second directional
valve 37 is connected to the tilt sensor 40, which is generally mounted on the telescopic
arm 2, for detecting the perpendicularity to the ground of the telescopic arm 2 during
elevation. The tilt sensor 40 is a commonly used device to those skilled in the art,
which may be purchased for installation and use based on the required model. In use,
the tilt sensor 40 feeds the detected signal to a control unit which is usually a
PLC or a single-chip micro-computer, and then the control unit controls the corresponding
directional valve to control a corresponding hydraulic actuating element. In operation,
hydraulic fluid is fed into the rodless cavity of the horizontal oil cylinder 32 so
that the horizontal oil cylinder 32 brings the vertical oil cylinder 33 to move horizontally.
When the horizontal oil cylinder 32 extends to its maximum position, the first directional
valve 36 is locked, and the 3-position, 4-way O-type solenoid directional valve switches
to the middle position, maintaining the horizontal oil cylinder 32 in the current
state. The hydraulic fluid begins entering the rodless cavity of the vertical oil
cylinder 33, and meanwhile opens the second hydraulic control check valve 39, so that
the hydraulic fluid in the rod cavity of the vertical oil cylinder 33 can return to
the return line 35 to support the truck chassis 1 to elevate. When the truck chassis
1 is elevated to an appropriate position and all of the four corners thereof are horizontal,
the 3-position, 4-way Y-type solenoid directional valve switches to the middle position,
and no more hydraulic fluid enters the rod cavity of the vertical oil cylinder 33.
Under the action of the first hydraulic control check valve 38 and the second hydraulic
control check valve 39, the vertical oil cylinder 33 is maintained at the current
position. Once a corner of the truck chassis 1 is tilted due to over loading, the
tilt sensor 40 will switch on the solenoid coil of the second directional valve 37,
and then the hydraulic fluid begins entering the rodless cavity of the vertical oil
cylinder 33, whereby the piston rod of the vertical oil cylinder 33 extends to compensate
for the tilt amount. Once the tilt sensor 40 resumes horizontal, the vertical oil
cylinder 33 is maintained at that position.
[0055] It is known that the larger the support area of the truck chassis 1, the higher the
stability of the truck chassis 1, and thus the stability of the telescopic arm 2.
To this end, the horizontal oil cylinder 32 is provided as a two-stage hydraulic cylinder,
which increases the horizontal extending length of the hydraulic support legs. Specifically,
as illustrated in Fig. 18, the horizontal oil cylinder 32 comprises a first cylinder
tube 3201 mounted at a fixed position, a second cylinder tube 3202 slidingly mounted
within the first cylinder tube 3201, and a third cylinder tube 3203 slidingly mounted
within the second cylinder tube 3202 and equivalent to the piston rod of the horizontal
oil cylinder 32. A sliding seal mechanism is disposed between the second cylinder
tube 3202 and the first cylinder tube 3201 and between the second cylinder body 3202
and the third cylinder tube 3203, respectively, to avoid leakage of hydraulic fluid.
An end portion of the third cylinder tube 3203 is connected to the vertical oil cylinder
33. The first cylinder tube 3201 communicates with the second cylinder tube 3202.
A plunger piston 3204 slidingly mounted within the second cylinder tube 3202 is fixed
to the end portion of the third cylinder tube 3203. A third central barrel 3207 is
provided inside the third cylinder tube 3203. One end of the third central barrel
3207 distal from the plunger piston 3204 is provided with a through-port 3208, and
the other end thereof extends through the plunger piston 3204 into the second cylinder
tube 3202. A second central barrel 3206 is nested within the third central barrel
3207, and adapted to the second cylinder tube 3202. A first central barrel 3205 is
nested in the second central barrel 3206, and adapted to the first cylinder tube 3201.
An end portion of the first central barrel 3205 is connected to a horizontal first
actuator port 3209 which locates at an end portion of the first cylinder tube 3201and
communicates with the through-port 3208. The end portion of the first cylinder tube
3201 is provided with a horizontal second actuator port 3210, which communicates with
an inner cavity of the first cylinder tube 3201. The horizontal second actuator port
3210 communicates with port A of the first directional valve 36, and the horizontal
first actuator port 3209 communicates with port B of the first directional valve 36.
When entering via the horizontal second actuator port 3210, the hydraulic fluid in
the inlet line 34 enters the first cylinder tube 3201, first pushing the plunger piston
3204 and bringing the third cylinder tube 3203 to extend out and meanwhile bringing
the vertical oil cylinder 33 to move horizontally, and the hydraulic fluid in the
third cylinder tube 3203 returns to the return line 3 5 via the through-port 3208.
Even after the third cylinder tube 3203 completely extends out, the hydraulic fluid
enters the first cylinder tube 3201 constantly, and the second cylinder tube 3202
extends outward constantly, and meanwhile continues to bring the vertical oil cylinder
33 to move horizontally. The horizontal oil cylinder 32 of such structure increases
the horizontal movement distance of the vertical oil cylinder 33 as well as the support
area, and thus enhancing support stability.
[0056] A first sleeve 3301 and a second sleeve 3302 are arranged in the third cylinder tube
3203 to parallel to each other. One end of the first sleeve 3301 is connected to the
first hydraulic control check valve 38, and the other end thereof extends through
the plunger piston 3204 into the second cylinder tube 3202. One end of the second
sleeve 3302 is connected to the second hydraulically control check valve 39, and the
other end thereof extends through the plunger piston 3204 into the second cylinder
tube 3202. A third sleeve 3303 is nested within the first sleeve 3301, and a fourth
sleeve 3304 is nested within the second sleeve 3302. Both the third sleeve 3303 and
the fourth sleeve 3304 are adapted to the second cylinder tube 3202. A fifth sleeve
3305 is nested within the third sleeve 3303, and a sixth sleeve 3306 is nested within
the fourth sleeve 3304. Both the fifth sleeve 3305 and the sixth sleeve 3306 are adapted
to the first cylinder tube 3201. A sliding seal mechanism is provided between the
first sleeve 3301 and the third sleeve 3303 and between the third sleeve 3303 and
the second sleeve 3302, respectively, to prevent leakage of hydraulic fluid. Likewise,
a sliding seal mechanism is provided between the second sleeve 3302 and the fourth
sleeve 3304 and between the fourth sleeve 3304 and the sixth sleeve 3306, respectively,
to prevent leakage of hydraulic fluid. The fifth sleeve 3305 has an end portion connected
to port A of the second directional valve 37, and the sixth sleeve 3306 has an end
portion connected to port B of the second directional valve 37. This structure sufficiently
utilizes the internal space of the horizontal oil cylinder 32 with the inlet and return
lines 35 of the vertical oil cylinder 33 built in, without dragging a plurality of
external hydraulic fluid lines, thereby offering a simple and pragmatic structure.
[0057] In operation, a truck carries the telescopic arm 2 to a designated position and the
front hydraulic support legs 4 and the transitional hydraulic cylinders 7 extend out
to support the truck chassis 1 stably. Then, the turning hydraulic cylinder 5 commences
extending out to push the telescopic arm 2 to turn. When the telescopic arm 2 is turned
to be in vertical state, that is, perpendicular to the ground, the rear hydraulic
support legs 6 extend out to support on the ground. At this point, the transitional
hydraulic cylinders 7 are retracted, and the truck and the telescopic arm 2 are supported
on the ground via the front hydraulic support legs 4 and the rear hydraulic support
legs 6. Now, the telescopic arm 2 is able to elevate to operate. Such structure provides
a large support area and a lower gravitational centre of the telescopic arm 2, and
thus a higher stability. In need of adjusting the perpendicularity of the telescopic
arm 2, the transitional hydraulic cylinders 7 extend out to compensate, in cooperation
with the rear hydraulic support legs 6 on the telescopic arm 2, for the tilt angle
of the telescopic arm 2. Since the transitional hydraulic cylinders 7 and the rear
hydraulic support legs 6 are near to the telescopic arm 2, and thus facilitate the
adjustment, they need to work together at this point. When the telescopic arm 2 is
turned to be in vertical state, with the winching power, the second fixed bracket
is gradually pulled towards the first fixed bracket 9 around the hinge shaft 22. Once
the second fixed bracket 20 is joined with the first fixed bracket 9 together, the
third power mechanism pushes the locating pin 23 to connect the first fixed bracket
9 with the second fixed bracket 20. Depending on the distance from the to-be-rescued
object, the second sliding bracket 21 extends out, and meanwhile the first sliding
bracket extends out, and the working cage 3 is balanced with the counterweight 11
to ensure a successful rescue. During elevation of the telescopic arm 2, the lifting
wire rope 20404 is wound sequentially and fixed, before the piston rod of the lifting
hydraulic cylinder 20409 of the last-stage telescoping cylinder 203 extends out. The
innermost-layer telescoping section 20403 of the last-stage telescoping cylinder 203,
which is the lightest in weight thereamong, is firstly elevated, and then the remaining
telescoping sections of the last-stage telescoping cylinder 203 are elevated sequentially
and section by section. Afterwards, the lifting hydraulic cylinders 20409 of the sub-last-stage
telescoping cylinder commence being elevated. By analogy, all other telescoping cylinders
are elevated stage by stage till the telescopic arm 2 is elevated to a desired height.
In order to descend, the piston rod of the lifting hydraulic cylinder 20409 of the
first-stage telescoping cylinder 201 is retracted, and the sub-outermost-layer telescoping
section 20402, which is the heaviest in weight, descends first, and then the other
telescoping sections of the first-stage telescoping cylinder 201 descend sequentially
and section by section. Afterwards, the piston rod of the lifting hydraulic cylinder
20409 of the second-stage telescoping cylinder 202 is retracted, enabling the second-stage
telescoping cylinder 202 to be retracted, and going on in this way, stage by stage,
till the last-stage telescoping cylinder 203 is retracted. The outermost-layer telescoping
section 20401 of the first-stage telescoping cylinder 201 is disposed on the ground,
so that the pressure fluid of the lifting hydraulic cylinder 20409 of the first-stage
telescoping cylinder 201 may be directly introduced from the inlet line 34 and the
return line 35. While the lifting hydraulic cylinder 20409 of the second-stage telescoping
cylinder 202 is mounted inside the innermost-layer telescoping section 20403 of the
first-stage telescoping cylinder 201, it is necessary to mount a tubing conveyer 205
at the bottom of the outermost-layer telescoping section 20401 of the first-stage
telescoping cylinder 201 so as to feed fluid to the lifting hydraulic cylinder 20409
of the second-stage telescoping cylinder 202. Likewise, a tubing conveyer 205 is also
provided within the innermost-layer telescoping section 20403 of the first-stage telescoping
cylinder 201 so as to feed fluid to the lifting hydraulic cylinder 20409 of the third-stage
telescoping cylinder. By analogy, a tubing conveyer 205 is provided in the innermost-layer
telescoping section 20403 of the previous stage of telescoping cylinder so as to feed
fluid to the lifting hydraulic cylinder 20409 of the next stage of telescoping cylinder,
till enable feeding fluid to the lifting hydraulic cylinder 20409 of the last-stage
telescoping cylinder. The hydraulic fluid from the previous stage of telescoping cylinder
is not only fed to the lifting hydraulic cylinder 20409 of the next stage of telescoping
cylinder, but also to the tubing conveyer 205 within the next stage of telescoping
cylinder, so as to enable the constant delivery of hydraulic fluid power with elevating/descending
of the telescopic arm 2.
[0058] In the embodiments of the present invention, the telescopic arm 2 is hinged to the
tail end of the truck chassis 1. In operation, the telescopic arm 2 is turned to be
in vertical state by the turning hydraulic cylinder 5, with the bottom of the telescopic
arm 2 close to the ground. Compared with conventional structure that the crank arm
is above the truck chassis 1, the gravitational centre of the telescopic arm 2 is
lowered, which increases stability of the telescopic arm 2.
[0059] The construction with telescoping sections vertically elevatable and nested together
significantly reduces the length of truck body, where the truck body may have a length
of 15.3 meters, a width of 2.5 meters, and a height of 4 meters, a maximum rescue
height of 144 meters and a maximum height rescue fire radius of 15 meters, and also
relatively reduces the turning radius. Compared with the fire truck with equivalent
rescue height, the present invention has a wider applicability and a higher flexibility,
particularly within the height range of 144 meters, the present invention has no rescue
blind area and enables a 15-meter rescue radius throughout the height of 144 meters,
so that only one fire truck can satisfy all rescue tasks throughout a high-rise building.
[0060] Although the present invention has been described in detail through generic description
and specific implementations, some modifications or alterations may be made based
on the present invention, which are obvious to those skilled in the art. Therefore,
all such modifications or alterations without departing from the spirits of the present
invention fall within the scope of the present invention.
1. A multi-stage hydraulic multiplication pulley vertical lifting-type elevating platform
fire truck, comprising a truck chassis,
characterized in that,
a telescopic arm is mounted to a tail of the truck chassis by hinging, and a rotary
platform is provided on a top end of the telescopic arm;
wherein a working arm is mounted on the rotary platform, and a working cage is mounted
at one end of the working arm;
wherein a turning hydraulic cylinder is mounted on the truck chassis, with one end
mounted on the truck chassis by hinging, and the other end mounted on the telescopic
arm by hinging;
wherein front hydraulic support legs are mounted on the truck chassis proximal to
a driving cab on both the left and the right,
wherein rear hydraulic support legs are mounted on the telescopic arm distal from
the driving cab on both the left and the right,
wherein an auxiliary supporting oil cylinder is provided on the truck chassis, with
a piston rod extending vertically upward, and
wherein transitional hydraulic cylinders are mounted at the tail end of the truck
chassis on both the left and the right.
2. The multi-stage hydraulic multiplication pulley vertical lifting-type elevating platform
fire truck according to claim 1, wherein the working arm comprises a first fixed bracket
having one end connected to a second fixed bracket and the other end formed as a first
opening,
wherein a first sliding bracket driven by a first power mechanism is slidingly mounted
within the first fixed bracket, with a counterweight mounted at the end of the first
sliding bracket extending out of the first opening,
wherein an end of the second fixed bracket distal from the first fixed bracket is
provided with a second opening, and
wherein a second sliding bracket driven by a second power mechanism is slidingly mounted
within the second fixed bracket, with the working cage mounted at the end of the second
sliding bracket extending out of the second opening.
3. The multi-stage hydraulic multiplication pulley vertical lifting-type elevating platform
fire truck according to claim 2, wherein the second fixed bracket is mounted to the
first fixed bracket by hinging via a hinge shaft, and a locating pin driven by a third
power mechanism is provided between the second fixed bracket and the first fixed bracket.
4. The multi-stage hydraulic multiplication pulley vertical lifting-type elevating platform
fire truck according to claim 3, wherein a supporting arm is fixedly mounted at the
end of the first fixed bracket proximal to the second fixed bracket, and a supporting
rope pulley is rotatably mounted on the supporting arm,
wherein a winch mechanism is provided at the first fixed bracket proximal to the first
opening,
wherein a hoisting arm is provided on the second fixed bracket,
wherein a hoisting wire rope is provided among the winch mechanism, the supporting
rope pulley and the hoisting arm, and
wherein the end of the hoisting arm distal from a hoisting point of the hoisting wire
rope is mounted to the second fixed bracket by hinging.
5. The multi-stage hydraulic multiplication pulley vertical lifting-type elevating platform
fire truck according to claim 4, wherein a first stopper for restricting a vertical
position of the hoisting arm is provided on the second fixed bracket, and a second
stopper for restricting the hoisting point of the hoisting arm to be lower than an
outer plane of the second fixed bracket is provided on the second fixed bracket.
6. The multi-stage hydraulic multiplication pulley vertical lifting-type elevating platform
fire truck according to claim 1, wherein the telescopic arm comprises telescoping
cylinders in a plurality of stages sequentially nesting together, each stage of telescoping
cylinder comprising a plurality of telescoping sections nesting together,
wherein each stage of telescoping cylinder is connected with a hydraulic wire-rope
lifter, where the hydraulic wire-rope lifter connected to a first-stage telescoping
cylinder is disposed within an outermost-layer telescoping section, and the hydraulic
wire-rope lifter connected to the next stage of telescoping cylinder is disposed within
an innermost-layer telescoping section of the previous stage of telescoping cylinder,
wherein the hydraulic wire-rope lifter comprises a lifting hydraulic cylinder having
a cylinder tube fixedly mounted at a bottom of the corresponding telescoping section,
wherein a fixed pulley set is mounted on the cylinder tube of the lifting hydraulic
cylinder, and a movable pulley set is mounted on a piston rod of the lifting hydraulic
cylinder,
wherein a lifting wire rope is provided between the lifting hydraulic cylinder and
the corresponding telescoping section, with one end fixed, and the other end wound
through the movable pulley set and the fixed pulley set before fixed on an innermost-layer
telescoping section of the corresponding stage of telescoping cylinder;
wherein an outermost-layer telescoping section of the next stage of telescoping cylinder
is nested within an innermost-layer telescoping section of the previous stage of telescoping
cylinder, and a tubing conveyer for feeding fluid to the next stage of telescoping
cylinder is mounted in the innermost-layer telescoping section of the previous stage
of telescoping cylinder,
wherein the working cage is mounted on the top of the innermost-layer telescoping
section of a last-stage telescoping cylinder, and
wherein the rear hydraulic support legs are mounted on an outer surface of the outermost-layer
telescoping section of the first-stage telescoping cylinder.
7. The multi-stage hydraulic multiplication pulley vertical lifting-type elevating platform
fire truck according to claim 6, wherein a rope allocating pulley, for allocating
the lifting wire rope of the corresponding fixed pulley set to a corresponding position,
is mounted both at the bottom of the outermost-layer telescoping section of the first-stage
telescoping cylinder and the bottom of the innermost-layer telescoping section of
the previous stage of telescoping cylinder.
8. The multi-stage hydraulic multiplication pulley vertical lifting-type elevating platform
fire truck according to claim 7, wherein a through-wall pulley is mounted at the bottom
of each telescoping section other than the outermost-layer telescoping section of
the first-stage telescoping cylinder,
wherein a bottom steering pulley is mounted both at the bottom inside of the outermost-layer
telescoping section of the first-stage telescoping cylinder and at the bottom inside
of the innermost-layer telescoping section of the previous stage of telescoping cylinder,
and
wherein a top steering pulley is mounted at the top inside of each telescoping section
other than the innermost-layer telescoping section of the last-stage telescoping cylinder.
9. The multi-stage hydraulic multiplication pulley vertical lifting-type elevating platform
fire truck according to claim 8, wherein the through-wall pulley traverses the corresponding
telescoping section, and the lifting wire rope is wound around the through-wall pulley
for at least two turns from outside of the corresponding telescoping section and then
passes to inside of the telescoping section.
10. The multi-stage hydraulic multiplication pulley vertical lifting-type elevating platform
fire truck according to claim 9, wherein the lifting wire rope of each stage of telescoping
cylinder is wound through the corresponding movable pulley set and fixed pulley set,
then the corresponding rope allocating pulley, the bottom steering pulley, the outermost-layer
top steering pulley, and the through-wall pulley of the neighbouring-layer telescoping
section, sequentially, and finally is fixed above the through-wall pulley of the innermost-layer
telescoping section.
11. The multi-stage hydraulic multiplication pulley vertical lifting-type elevating platform
fire truck according to claim 10, wherein a swing arm is provided between every two
neighbouring telescoping sections, with one end mounted to the outer-layer telescoping
section by hinging, and the other end provided with an inclined guide surface,
wherein the end of the swing arm proximal to the inclined guide surface is provided
with a roller,
wherein an adjusting screw is threadedly connected to a flange on the top end of the
outer-layer telescoping section, with an end portion of the adjusting screw abutting
against the inclined guide surface, and
wherein, under the action of the adjusting screw, an outer edge of the roller abuts
against an outer surface of the inner-layer telescoping section.
12. The multi-stage hydraulic multiplication pulley vertical lifting-type elevating platform
fire truck according to any of claims 6 to 11, wherein the tubing conveyer comprises
a mounting bracket, on which a core-tube driven by a fourth power mechanism is rotatably
mounted,
wherein the core-tube is provided therein with a separator plate, which divides an
inner cavity of the core-tube into an inlet chamber and a return chamber,
wherein an inlet duct communicating with the inlet chamber is fixedly mounted on the
core-tube, and a return duct communicating with the return chamber is fixedly mounted
on the core-tube,
wherein the inlet chamber is connected to an inlet line via a rotational joint, and
the return chamber is connected to the return line via another rotational joint,
wherein a web plate is fixedly mounted on an outer surface of the core-tube, with
a dual-groove pulley disc fixedly mounted on the web plate, and the core-tube, the
web plate and the dual-groove pulley disc are arranged co-axially, and
wherein an inlet hose having an end connected to the inlet duct and a return hose
having an end connected to the return duct are coiled within the dual-groove pulley
disc, respectively.
13. The multi-stage hydraulic multiplication pulley vertical lifting-type elevating platform
fire truck according to claim 12, wherein a guide pulley is rotatably mounted on the
mounting bracket, and a floating pulley is disposed under the guide pulley, and
wherein both the inlet hose and the return hose are wound through the guide pulley
and the floating pulley before connected to the lifting hydraulic cylinder of the
next stage of telescoping cylinder.
14. The multi-stage hydraulic multiplication pulley vertical lifting-type elevating platform
fire truck according to claim 13, wherein a first sensor and a second sensor are provided
on the mounting bracket, with the first sensor disposed under the guide pulley and
above the floating pulley, and the second sensor disposed under the floating pulley,
and
wherein both the first sensor and the second sensor are connected to the fourth power
mechanism.
15. The multi-stage hydraulic multiplication pulley vertical lifting-type elevating platform
fire truck according to claim 14, wherein a tension spring is provided between the
floating pulley and the mounting bracket, with one end of the tension spring fixed
on the floating pulley, and the other end thereof fixed on the mounting bracket.
16. The multi-stage hydraulic multiplication pulley vertical lifting-type elevating platform
fire truck according to claim 15, wherein the fourth power mechanism comprises an
electric motor mounted on the fixed bracket, and an outer gear ring is fixedly mounted
on the web plate, and
wherein a transmission shaft is rotatably mounted on the mounting bracket, with one
end of the transmission shaft mounted with a drive gear meshing with the outer gear
ring, and the other end thereof being in transmission connection with the electric
motor.