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(11) | EP 4 282 808 A1 |
| (12) | EUROPEAN PATENT APPLICATION |
| published in accordance with Art. 153(4) EPC |
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| (54) | COUNTERWEIGHT DISPLACEMENT MECHANISM AND OPERATING MACHINE |
| (57) A counterweight displacement mechanism and an operating machine (100). The counterweight
displacement mechanism comprises a machine frame (1), a rotary table (2), a counterweight
mounting frame (3), a counterweight (4) and a jacking device (5), wherein the rotary
table (2) has a head portion (21) and a tail portion (22), and the head portion (21)
is connected to the machine frame (1); the counterweight mounting frame (3) is rotatably
connected to the tail portion (22) along an axis in a vertical direction, the counterweight
mounting frame (3) is provided with a connecting portion (31), and the connecting
portion (31) is located on one side of a rotating axis of the counterweight mounting
frame (3); the counterweight (4) is provided with a mating portion (41) detachably
connected to the connecting portion (31); and the jacking device (5) is used for driving
the mating portion (41) to move up and down relative to the connecting portion (31). |
TECHNICAL FIELD
[0001] The present application relates to the technical field of work machine, in particular, to a counterweight displacement mechanism and a work machine.
BACKGROUND
[0002] At present, work machines (such as cranes), especially small and medium tonnage work machines, mostly use fixed counterweight, and some work machines use movable counterweight structures. The movable counterweight structures are mostly provided with a telescopic counterweight mounting rack having a drive device. A counterweight is mounted on the telescopic counterweight mounting rack. The gravity center of the vehicle can be moved backward through the extension or retraction of the telescopic counterweight mounting rack to increase the stability of the vehicle. However, the traditional movable counterweight structure has the problems of complex structure and large longitudinal space occupation. For large tonnage work machine, especially super-large tonnage work machine, it may not be able to meet the longitudinal space requirements during telescopic movement and translation movement.
SUMMARY
[0003] The present application provides a counterweight displacement mechanism and a work machine to solve the problems in the related art that a movable counterweight structure has the problems of complex structure and large longitudinal space occupation.
[0004] The present application provides a counterweight displacement mechanism, including:
a frame;
a swivel table having a head portion and a tail portion, where the head portion is connected to the frame, and the head portion and the tail portion are oppositely provided in a length direction of the swivel table;
a counterweight mounting rack, rotatably connected to the tail portion along an axis of a vertical direction, where the counterweight mounting rack is provided with a connecting portion, and the counterweight mounting rack is located on a side of a rotation axis of the counterweight mounting rack;
a counterweight, provided with a matching portion detachably connected to the connecting portion; and
a jacking device for driving the matching portion to move up or down relative to the connecting portion.
[0005] In an embodiment, the counterweight mounting rack is two counterweight mounting racks, and the two counterweight mounting racks are provided on two sides of the tail portion in a width direction of the swivel table, respectively; and
the matching portion is two matching portions respectively corresponding to the two counterweight mounting racks, and the two matching portions are detachably connected to two connecting portions respectively.
[0006] In an embodiment, the connecting portion and the matching portion are detachably connected to each other through a connecting pin shaft; and
the connecting portion is provided with a first pin hole for the connection pin shaft to pass through, and the matching portion is provided with a second pin hole for the connection pin shaft to pass through.
[0007] In an embodiment, the counterweight mounting rack or the matching portion is provided with a pin shaft bracket, the connection pin shaft has a first end and a second end which are opposite to each other, and the first end of the connection pin shaft is movably connected to the pin shaft bracket in an extending direction of the first pin hole;
where when the matching portion is located at a first position and the connecting pin shaft is located at a first pin shaft position, the second end of the connecting pin shaft passes through the first pin hole and the second pin hole and the connecting portion is connected to the matching portion; and
when the connecting pin shaft is located at a second pin shaft position, the connecting portion and the matching portion are separated from the connecting pin shaft and the connecting portion and the matching portion are separable.
[0008] In an embodiment, the counterweight mounting rack is provided with an abutting portion, and the abutting portion is located above the first pin hole;
where when the matching portion is located at the first position, a top end of the matching portion abuts the abutting portion and the first pin hole and the second pin hole are opposite to each other in the extending direction of the first pin hole; and
when the matching portion is located at the second position, the matching portion is located below the abutting portion.
[0009] In an embodiment, the abutting portion is a positioning pin provided along the extending direction of the first pin hole; and
the top end of the matching portion is provided with a V-shaped groove having an opening facing upward, and the V-shaped groove penetrates the matching portion in an extending direction of the second pin hole;
where when the matching portion is located at the first position, the positioning pin at least partially protrudes into the V-shaped groove and the positioning pin abuts against two side walls of the V-shaped groove which are opposite to each other.
[0010] In an embodiment, the jacking device is provided on the frame and is located below the counterweight mounting rack; or
the jacking device is provided on the counterweight and is dynamically coupled to the matching portion.
[0011] In an embodiment, a locking structure is provided between the counterweight mounting rack and the tail portion, and the locking structure is configured to limit the rotation of the counterweight mounting rack when the counterweight mounting rack is adjusted to rotate to a preset mounting position.
[0012] In an embodiment, the locking structure includes:
a connecting plate, connected to the tail portion and provided downward, and provided with a first limiting hole and a second limiting hole which pass through the connecting plate; and
a locking bolt, provided along the rotation axis of the counterweight mounting rack, and having a locking end facing toward the connecting plate and a connecting end facing away from the connecting plate, where the connecting end of the locking bolt is connected to the counterweight mounting rack through an elastic component;
where when the counterweight mounting rack is located at a first mounting position, the connecting portion is closer to the head portion than the rotation axis of the counterweight mounting rack, and the locking end of the locking bolt is clamped with the first limiting hole; and
when the counterweight mounting rack is located at a second mounting position, the connecting portion is farther away from the head portion than the rotation axis of the counterweight mounting rack and the locking end of the locking bolt is clamped with the second limiting hole.
[0013] The present application further provides a work machine including the above-mentioned counterweight displacement mechanism.
[0014] In the counterweight displacement mechanism and the work machine provided by the present application, by disassembling the counterweight and the counterweight mounting rack, lifting the counterweight to the counterweight mounting rack through the jacking device for mounting the counterweight on the counterweight mounting rack after rotating and adjusting the counterweight mounting rack, the movement and adjustment of the counterweight can be realized. In this way, it will occupy less longitudinal space when moving and adjusting the counterweight, and the counterweight mounting rack has a simple structure and light weight and is easier to be rotated because the counterweight mounting rack does not need to be provided with a driving device.
BRIEF DESCRIPTION OF DRAWINGS
[0015] In order to explain the solutions according to the present application or the related art more clearly, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the related art. The drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.
FIG. 1 is a structural schematic diagram of a work machine provided by the present application, and a counterweight mounting rack is located at a first mounting position.
FIG. 2 is an enlarged schematic diagram of part "A" in FIG. 1.
FIG. 3 is a partial structural schematic diagram of the work machine in FIG. 1.
FIG. 4 is an enlarged schematic diagram of part "B" in FIG. 3.
FIG. 5 is a partial structural schematic diagram of the structure in FIG. 3.
FIG. 6 is a structural schematic diagram of the work machine in FIG. 1, and the counterweight mounting rack is located at a second mounting position.
FIG. 7 is a partial structural schematic diagram of the work machine in FIG. 6.
[0016] Reference numerals: 1-frame; 2-swivel table; 21-head portion; 22-tail portion; 3-counterweight mounting rack; 31-connecting portion; 32-first pin hole; 33-abutting portion; 4-counterweight; 41-matching portion; 42-second pin hole; 43-V-shaped groove; 5-jacking device; 6-connecting pin shaft; 7-pin shaft bracket; 8-locking structure; 81-connecting plate; 82-first limiting hole; 83-second limiting hole; 84-locking bolt; 100-work machine.
DETAILED DESCRIPTION OF THE EMBODIMENTS
[0017] In order to make the objectives, solutions and advantages of the present application clearer, the solutions in the present application will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are part of the embodiments of the present application, not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.
[0018] A counterweight displacement mechanism provided by the present application will be described in the following with reference to FIG. 1 to FIG. 7. The counterweight displacement mechanism can be used in a crane, a concrete pump truck, a fire truck and other work machines. Description will be given using a crane as an example.
[0019] As shown in FIG.1 to FIG. 4, the counterweight displacement mechanism includes a frame 1, a swivel table 2, a counterweight mounting rack 3, a counterweight 4 and a jacking device 5. The swivel table 2 has a head portion 21 and a tail portion 22. The head portion 21 is connected to the frame 1, and the head portion 21 and the tail portion 22 are oppositely provided in the length direction of the swivel table 2. The counterweight mounting rack 3 is rotatably connected to the tail portion 22 along an axis of a vertical direction. The counterweight mounting rack 3 is provided with a connecting portion 31 which is located on one side of a rotation axis of the counterweight mounting rack 3. The counterweight 4 is provided with a matching portion 41 detachably connected to the connecting portion 31. The jacking device 5 is configured for driving the matching portion 41 to move up or down relative to the connecting portion 31.
[0020] In an embodiment, when it is needed to move the counterweight 4 to adjust it, the connecting portion 31 and the matching portion 41 are firstly disassembled, and the counterweight 4 is lowered through the jacking device 5. And then the counterweight mounting rack 3 is rotated to adjust it, and the counterweight 4 is translated by the lifting device of the work machine 100, to make the matching portion 41 and the connecting portion 31 vertically opposite to each other. By lifting the counterweight 4 to the counterweight mounting rack 3 through the jacking device 5 for mounting the counterweight 4 on the counterweight installation rack 3, the movement and adjustment of the counterweight 4 can be realized.
[0021] In the counterweight displacement mechanism provided by the present application, the movement and adjustment of the counterweight 4 can be realized by disassembling the counterweight 4 and the counterweight mounting rack 3, rotating and adjusting the counterweight mounting rack 3, and lifting the counterweight 4 to the counterweight mounting rack 3 by the jacking device 5 for mounting the counterweight 4 on the counterweight mounting rack 3. In this way, it will occupy less longitudinal space when moving and adjusting the counterweight 4, and the counterweight mounting rack 3 has a simple structure and light weight and is easier to be rotated because the counterweight mounting rack 3 does not need to be provided with a driving device.
[0022] The jacking device 5 can drive the matching portion 41 to move up or down relative to the connecting portion 31 in various ways. For example, the jacking device 5 can be provided on the counterweight 4 and be dynamically coupled to the matching portion 41. In this example, the jacking device 5 can be a telescopic cylinder whose cylinder rod can be connected to the matching portion 41 and whose cylinder body can be fixedly connected to the main body of the counterweight 4. When the counterweight 4 is located below the counterweight mounting rack 3, the cylinder rod of the telescopic cylinder is firstly driven to be extended, to make the matching portion 41 move to the connecting portion 31 of the counterweight mounting rack 3. After the matching portion 41 is fixedly connected to the connecting portion 31, the cylinder rod of the telescopic cylinder is driven to be retracted to lift upward the main body of the counterweight 4. For another example, as shown in FIG. 5 and FIG. 7, the jacking device 5 can be provided on the frame 1 and can be located below the counterweight mounting rack 3. The jacking device 5 lifts and lowers the counterweight 4 as a whole to drive the matching portion 41 to move up or down relative to the connecting portion 31. In this example, the jacking device 5 can be an oil cylinder which is oiled through a rodless cavity, which is conducive to realizing lightweight design and low cost.
[0023] As shown in FIG. 4 and FIG. 5, in an embodiment, the number of counterweight mounting racks 3 is two, and the two counterweight mounting racks 3 are provided on two sides of the tail portion 22 in a width direction of the swivel table 2 respectively; and two matching portions 41 corresponding to the two counterweight mounting racks 3 are provided, and the two matching portions 41 are detachably connected to the two connecting portions 31 respectively. In this way, the force on the counterweight 4 will be more balanced.
[0024] There are many ways to realize a detachable connection between the connecting portion 31 and the matching portion 41. For example, the connecting portion 31 and the matching portion 41 can be fixedly connected through a screw joint component. For another example, as shown in FIG. 2, FIG. 4 and FIG. 5, the connecting portion 31 and the matching portion 41 can be detachably connected through a connecting pin shaft 6. In this example, the connecting portion 31 is provided with a first pin hole 32 for the connection pin shaft 6 to pass through, and the matching portion 41 is provided with a second pin hole 42 for the connection pin shaft 6 to pass through. The detachable connection between the connecting portion 31 and the matching portion 41 is realized by the connecting pin shaft 6, which makes the disassembly and assembly of the counterweight 4 are more convenient.
[0025] As shown in FIG. 2, in an embodiment, the counterweight mounting rack 3 or the matching portion 41 is provided with a pin shaft bracket 7, the connection pin shaft 6 has a first end and a second end which are opposite to each other, and the first end of the connection pin shaft 6 is movably connected to the pin shaft bracket 7 along an extending direction of the first pin hole 32. When the matching portion 41 is located at a first position and the connecting pin shaft 6 is located at a first pin shaft position, the second end of the connecting pin shaft 6 passes through the first pin hole 32 and the second pin hole 42, and the connecting portion 31 is connected to the matching portion 41. When the connecting pin shaft 6 is located at a second pin shaft position, the connecting portion 31 and the matching portion 41 are separated from the connecting pin shaft 6, and the connecting portion 31 and the matching portion 41 are separable. As shown in FIG. 2, the pin shaft bracket 7 is fixedly mounted on the counterweight mounting rack 3, and the connection pin shaft 6 is connected to the pin shaft bracket 7, which can avoid lost of the connection pin shaft 6.
[0026] As shown in FIG. 4 and FIG. 5, in an embodiment, the counterweight mounting rack 3 is provided with an abutting portion 33 which is located above the first pin hole 32. When the matching portion 41 is located at the first position, a top end of the matching portion 41 abuts the abutting portion 33, and the first pin hole 32 and the second pin hole 42 are opposite to each other in the extending direction of the first pin hole 32. When the matching portion 41 is located at the second position, the matching portion 41 is located below the abutting portion 33. During the process of lifting the counterweight 4 by the jacking device 5, the abutting portion 33 can position the counterweight 4, thereby facilitating the smooth insertion of the connecting pin shaft 6 to fix the counterweight 4.
[0027] In an embodiment, as shown in FIG. 4 and FIG. 5, the abutting portion 33 is a positioning pin provided along the extending direction of the first pin hole 32. The top end of the matching portion 41 is provided with a V-shaped groove 43 having an opening facing upward, and the V-shaped groove 43 penetrates the matching portion 41 in an extending direction of the second pin hole 42. When the matching portion 41 is located at the first position, the positioning pin at least partially protrudes into the V-shaped groove 43, and the positioning pin abuts against two side walls of the V-shaped groove 43 which are opposite to each other. Through the limiting matching between the positioning pin and the V-shaped groove 43, the counterweight 4 can be prevented from shaking during working.
[0028] As shown in FIG. 2 and FIG. 5, in an embodiment, a locking structure 8 is provided between the counterweight mounting rack 3 and the tail portion 22, which is configured to limit the rotation of the counterweight mounting rack 3 when the counterweight mounting rack 3 is adjusted to rotate to a preset mounting position. After the counterweight mounting rack 3 is adjusted, the locking structure 8 can prevent the counterweight mounting rack 3 from shaking.
[0029] In an embodiment, as shown in FIG. 2 and FIG. 5, the locking structure 8 includes a connecting plate 81 and a locking bolt 84. The connecting plate 81 is connected to the tail portion 22 and is provided downward, and the connecting plate 81 is provided with a first limiting hole 82 and a second limiting hole 83 which pass through the connecting plate 81. The locking bolt 84 is provided along the rotation axis of the counterweight mounting rack 3, and the locking bolt 84 has a locking end facing toward the connecting plate 81 and a connecting end facing away from the connecting plate 81. The connecting end of the locking bolt 84 is connected to the counterweight mounting rack 3 through an elastic component. When the counterweight mounting rack 3 is located at a first mounting position, the connecting portion 31 is closer to the head portion 21 than the rotation axis of the counterweight mounting rack 3, and the locking end of the locking bolt 84 is clamped with the first limiting hole 82. When the counterweight mounting rack 3 is located at a second mounting position, the connecting portion 31 is farther away from the head portion 21 than the rotation axis of the counterweight mounting rack 3, and the locking end of the locking bolt 84 is clamped with the second limiting hole 83. As shown in FIG. 1 and FIG. 6, the length direction of the frame 1 is a front-rear direction, and then two mounting positions of the counterweight are formed on the frame 1, and one of them is on the front of the frame 1 and the other is on the rear of the frame 1. The jacking devices 5 are provided on the frame 1 and correspond to the two mounting positions of the counterweight. In an embodiment, a plurality of jacking devices 5 are mounted on the frame 1 at intervals along the width direction of the frame 1 and correspond to each mounting position of the counterweight. For example, as shown in FIG. 7, two jacking devices 5 are mounted on the frame 1 at intervals along the width direction of the frame 1 and correspond to each counterweight mounting position.
[0030] The present application further provides a work machine 100. The work machine 100 can be a crane, a concrete pump truck, or a fire truck, etc. As shown in FIG.1 to FIG. 7, the work machine 100 includes the above-mentioned counterweight displacement mechanism.
[0031] In the work machine 100 provided by the present application, by disassembling the counterweight 4 and the counterweight mounting rack 3, lifting the counterweight 4 to the counterweight mounting rack 3 through the jacking device 5 for mounting the counterweight 4 on the counterweight mounting rack 3 after rotating and adjusting the counterweight mounting rack 3, the movement and adjustment of the counterweight 4 can be realized. In this way, it will occupy less longitudinal space when moving and adjusting the counterweight 4, and the counterweight mounting rack 3 has a simple structure and light weight and is easier to be rotated because the counterweight mounting rack 3 does not need to be provided with a driving device.
[0032] Finally, it should be noted that the above embodiments are only used to illustrate the solutions of the present application, but not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they are still able to modify the solutions described in the foregoing embodiments, or to perform equivalent replacements for some of the features; and these modifications or replacements do not make the essence of the corresponding solutions deviate from the scope of the solutions of the embodiments of the present application.
a frame (1);
a swivel table (2) having a head portion (21) and a tail portion (22), wherein the head portion (21) is connected to the frame (1), and the head portion (21) and the tail portion (22) are oppositely provided in a length direction of the swivel table (2);
a counterweight mounting rack (3), rotatably connected to the tail portion (22) along an axis of a vertical direction, wherein the counterweight mounting rack (3) is provided with a connecting portion (31) and the connecting portion (31) is located on a side of a rotation axis of the counterweight mounting rack (3);
a counterweight (4), provided with a matching portion (41) detachably connected to the connecting portion (31); and
a jacking device (5) for driving the matching portion (41) to move up or down relative to the connecting portion (31).
the matching portion (41) is two matching portions (41) respectively corresponding to the two counterweight mounting racks (3), and the two matching portions (41) are detachably connected to two connecting portions (31) respectively.
the connecting portion (31) is provided with a first pin hole (32) for the connection pin shaft (6) to pass through, and the matching portion (41) is provided with a second pin hole (42) for the connection pin shaft (6) to pass through.
wherein when the matching portion (41) is located at a first position and the connecting pin shaft (6) is located at a first pin shaft position, the second end of the connecting pin shaft (6) passes through the first pin hole (32) and the second pin hole (42) and the connecting portion (31) is connected to the matching portion (41); and
when the connecting pin shaft (6) is located at a second pin shaft position, the connecting portion (31) and the matching portion (41) are separated from the connecting pin shaft (6) and the connecting portion (31) and the matching portion (41) are separable.
wherein when the matching portion (41) is located at a first position, a top end of the matching portion (41) abuts the abutting portion (33) and the first pin hole (32) and the second pin hole (42) are opposite to each other in an extending direction of the first pin hole (32); and
when the matching portion (41) is located at a second position, the matching portion (41) is located below the abutting portion (33).
the top end of the matching portion (41) is provided with a V-shaped groove (43) having an opening facing upward, and the V-shaped groove (43) penetrates the matching portion (41) in an extending direction of the second pin hole (42);
wherein when the matching portion (41) is located at the first position, the positioning pin at least partially protrudes into the V-shaped groove (43) and the positioning pin abuts against two side walls of the V-shaped groove (43) which are opposite to each other.
the jacking device (5) is provided on the counterweight (4) and is dynamically coupled to the matching portion (41).
a connecting plate (81), connected to the tail portion (22) and provided downward, and provided with a first limiting hole (82) and a second limiting hole (83) which pass through the connecting plate (81); and,
a locking bolt (84), provided along the rotation axis of the counterweight mounting rack (3), and having a locking end facing toward the connecting plate (81) and a connecting end facing away from the connecting plate (81), wherein the connecting end of the locking bolt (84) is connected to the counterweight mounting rack (3) through an elastic component;
wherein when the counterweight mounting rack (3) is located at a first mounting position, the connecting portion (31) is closer to the head portion (21) than the rotation axis of the counterweight mounting rack (3) and the locking end of the locking bolt (84) is clamped with the first limiting hole (82); and
when the counterweight mounting rack (3) is located at a second mounting position, the connecting portion (31) is farther away from the head portion (21) than the rotation axis of the counterweight mounting rack (3) and the locking end of the locking bolt (84) is clamped with the second limiting hole (83).