Technical Field
[0001] The present invention relates to an elevator control device, an elevator, and an
elevator control method.
Background Art
[0002] There is a technology disclosed in Japanese Unexamined Patent Application Publication
No.
2016-117558 (PTL 1) as a technology relating to maintenance work of an elevator. The patent literature
describes that "A braking release mode of releasing the braking state of an elevator
car if a predetermined operation is inputted to a predetermined device while the elevator
car is in the braking state during a predetermined operation mode is provided....
A braking state can be released just by a maintenance worker performing braking release
operation even when an elevator car 1 is braked undesirably and raising and lowering
the elevator car 1 becomes impossible while the maintenance worker performs inspection
work on the elevator car 1".
Citation List
Patent Literature
[0003] PTL 1: Japanese Unexamined Patent Application Publication No.
2016-117558
Summary of Invention
Technical Problem
[0004] By the technology described in PTL 1, however, a maintenance worker on an elevator
car is at risk if an elevator operation mode is wrongly restored to a normal mode
even in a state where the maintenance worker is on the elevator car.
[0005] In view of the above situation, an object of the present invention is to provide
an elevator control device, an elevator, and an elevator control method, which are
capable of improving safety in maintenance work of an elevator.
Solution to Problem
[0006] The configuration described in CLAIMS is adopted for example in order to solve the
above problem. The present application includes a plurality of means for solving the
above problem and an example of the means is as follows: an elevator control device
having an operation control unit to control operation of an elevator in accordance
with an operation mode selected by a selector switch installed at an upper part of
an elevator car includes a maintenance worker boarding/leaving judgment unit to judge
whether a maintenance worker boards or leaves the elevator car on the basis of a signal
from a governor encoder for detecting a travel distance of the elevator car in a hoistway,
and a switch operation permission unit to permit the operation control unit to operate
in an operation mode selected by the selector switch on the basis of a state where
the maintenance worker boards or leaves the elevator car judged at the maintenance
worker boarding/leaving judgment unit.
Advantageous Effects of Invention
[0007] The present invention of the above configuration makes it possible to provide an
elevator control device, an elevator, and an elevator control method, which are capable
of improving safety of a maintenance worker in maintenance work of an elevator.
[0008] Problems, configurations, and effects other than the above descriptions will be obvious
from the explanations of the following embodiments.
Brief Description of Drawings
[0009]
Figure 1 is a general configuration diagram of an elevator according to an embodiment.
Figure 2 is a circuit diagram of switches and detectors involved in maintenance work
of an elevator according to an embodiment.
Figure 3 is a block diagram of an elevator control device according to an embodiment.
Figure 4 is a flowchart showing procedures of maintenance work of an elevator by a
maintenance worker.
Figure 5 is a flowchart showing a first elevator control method according to an embodiment.
Figure 6 is a flowchart showing a second elevator control method according to an embodiment.
Figure 7 is a flowchart showing a modified example of the second elevator control
method according to an embodiment.
Description of Embodiments
[0010] Embodiments relating to an elevator control device, an elevator, and an elevator
control method according to the present invention are hereunder explained in detail
in reference to the drawings. Here, in the embodiments explained below, firstly a
general configuration of an elevator is explained and successively an elevator control
device installed in the elevator and an elevator control method implemented by the
elevator control device are explained.
«Configuration of elevator control device»
[0011] Figure 1 is a general configuration diagram showing an example of an elevator 1 to
which an elevator control device and an elevator control method according to an embodiment
are applied. As shown in Figure 1, the elevator 1 has a hoistway 1a installed in the
manner of vertically penetrating the interior of a building or the like. The lower
part of the hoistway 1a constitutes a pit 1b formed by being dug from the bottom floor
of a building.
[0012] The elevator 1 has a hoisting machine 2, a rope 3, an elevator car 4, a counterweight
5, a governor encoder 6, and a PosiTector 7 in the hoistway 1a. A car top stop switch
11, a car top maintenance operation device 12, and a handrail 13 are installed at
the upper part of the elevator car 4. Further, the elevator 1 has platform doors 14
at positions corresponding to respective platform floors 1f over a sidewall of the
hoistway 1a, and a pit maintenance operation device 15 in the pit 1b at the lower
part of the hoistway 1a. Furthermore, the elevator 1 has an elevator control device
100 for controlling operation of the elevator car 4 and operation of switching an
operation mode between a normal mode and a maintenance mode is implemented. Those
components constituting the elevator 1 are explained hereunder.
<Hoisting machine 2>
[0013] The hoisting machine 2 is fixed to the interior of the pit 1b of the hoistway 1a
in the state of wrapping the rope 3. The hoisting machine 2 has a motor not shown
in the figure and is configured so as to move the rope 3 by the rotation of the hoisting
machine 2.
<Rope 3>
[0014] The rope 3 is for hanging the elevator car 4 and the counterweight 5. For example,
both the ends of the rope 3 are fixed to a ceiling 1c of the hoistway 1a and the rope
3 is wrapped at intermediate parts around two pulleys 3a fixed to the ceiling 1c and
is wrapped around the hoisting machine 2 and the counterweight 5 respectively between
the two pulleys 3a and the fixed part. The rope 3 lifts and lowers the elevator car
4 and the counterweight 5 freely in the hoistway 1a by the drive of the hoisting machine
2.
<Elevator car 4>
[0015] The elevator car 4 is for carrying people and luggage and is installed in the state
of being hanged in the hoistway 1a by the rope 3. For example, the rope 3 is wrapped
around car pulleys 4a fixed to an upper part or a lower part of the elevator car 4,
and the elevator car 4 rises or lowers vertically in the hoistway 1a in accordance
with rotation of the hoisting machine 2. The elevator car 4 has a car door (not shown
in the figure) that slides horizontally to open and close at a position facing the
platform doors 14 installed at the hoistway 1a. Further, an operation button (not
shown in the figure) for controlling a designation of the elevator car 4 and opening
and closing of the car door and contacting outside in the event of an emergency is
installed at a position close to the car door.
<Counterweight 5>
[0016] The counterweight 5 is for balancing the elevator car 4 and is installed in the state
of being hung in the hoistway 1a by the rope 3. A counterweight pulley 5a is fixed
to the counterweight 5 and the rope 3 is wrapped around the counterweight pulley 5a.
As a result, the counterweight 5 rises and lowers in a vertical direction opposite
to the elevator car 4 in the hoistway 1a in accordance with rotation of the hoisting
machine 2.
<Governor encoder 6>
[0017] The governor encoder 6 detects the number of revolutions of the hoisting machine
2 and is installed in the hoisting machine 2 as a travel distance detection means
for detecting a travel distance of the elevator car 4. The governor encoder 6 is connected
to the elevator control device 100 so that information on the detected number of revolutions
of the hoisting machine 2 may be transmitted to the elevator control device 100. In
particular, the governor encoder 6 acts as one of detectors to judge whether or not
the operation mode of the elevator 1 may be switched.
<PosiTector 7>
[0018] The PosiTector 7 outputs a signal to judge whether or not the elevator car 4 is located
at a position of allowing the car door installed in the elevator car 4 to be opened.
For example, the PosiTector 7 includes light shielding plates 7a formed in the manner
of protruding from the inner wall of the hoistway 1a and an optical sensor 7b formed
in the manner of protruding from the outer wall of the elevator car 4 toward the inner
wall of the hoistway 1a. Then whether or not the elevator car 4 is located at a platform
floor is detected by the output of an on/off signal from the optical sensor.
<Car top stop switch 11>
[0019] The car top stop switch 11 is a switch for stopping the travel of the elevator car
4 in the hoistway 1a. The car top stop switch 11 is installed at a position close
to a platform door 14 at an upper part of the elevator car 4 and is arranged at a
position where a maintenance worker M who has opened a platform door 14 can press
the switch immediately from a platform floor 1f. The car top stop switch 11 is connected
to the elevator control device 100 and acts as one of judgment switches to judge whether
or not the operation mode of the elevator 1 may be switched.
<Car top maintenance operation device 12>
[0020] The car top maintenance operation device 12 is a device for a maintenance worker
M to operate the travel of the elevator car 4 for maintenance and inspection of the
elevator 1. For example, the car top maintenance operation device 12 has an operation
mode selector switch 12a, a lift switch 12b, a down switch 12c, a travel switch 12d,
and a car stop switch 12e.
[0021] In the switches, the operation mode selector switch 12a is a switch for selecting
the operation mode of the elevator 1 between a normal mode and a maintenance mode.
The lift switch 12b, the down switch 12c, and the travel switch 12d are operation
switches for the maintenance worker M to operate and move the elevator car 4 when
the operation mode is switched to the maintenance mode. Further, the car stop switch
12e is one of switches for stopping the travel of the elevator car 4 and functions
similarly to the car top stop switch 11.
[0022] The car top maintenance operation device 12 having such respective switches is connected
to the elevator control device 100. Then in particular, the operation mode selector
switch 12a and the car stop switch 12e are also judgment switches to judge whether
or not the operation mode of the elevator 1 may be switched.
<Handrail 13>
[0023] The handrail 13 is a freely assembled frame member installed at an upper part of
the elevator car 4. A handrail switch 13a that switches on or off by assembling the
handrail 13 is installed in the handrail 13. The handrail switch 13a is connected
to the elevator control device 100 and acts as one of switches to judge whether or
not the operation mode of the elevator 1 may be switched.
<Platform door 14>
[0024] The platform doors 14 are installed at positions of the heights of respective platform
floors 1f where the elevator car 4 stops over a wall surface of the hoistway 1a. Each
of the platform doors 14 slides to open and close in the horizontal direction, does
not have a unique power, and opens and closes following a car door by engaging with
the car door of the elevator car 4. Further, a platform door open/close detector 14a
that is turned off by the opening of the door is installed in each of the platform
doors 14. Each of the platform door open/close detectors 14a is connected to the elevator
control device 100 that will be explained later and acts as one of detectors to judge
whether or not the operation mode of the elevator 1 may be switched.
<Pit maintenance operation device 15>
[0025] The pit maintenance operation device 15 has functions similar to the car top maintenance
operation device 12 explained earlier and is installed in the pit. For example, the
pit maintenance operation device 15 has a pit side operation mode selector switch
15a, a pit side lift switch 15b, a pit side down switch 15c, a pit side travel switch
15d, and a pit side car stop switch 15e. The respective switches function similarly
to the respective switches installed in the car top maintenance operation device 12.
[0026] The pit maintenance operation device 15 is connected to the elevator control device
100. Then the pit side operation mode selector switch 15a and the pit side car stop
switch 15e act as judgment switches to judge whether or not the operation mode of
the elevator 1 may be switched.
<Elevator control device 100>
[0027] The elevator control device 100 is for controlling operation of the elevator 1 in
a normal mode and a maintenance mode including drive of the hoisting machine 2 for
lifting and lowering the elevator car 4 and open and close of the car door that is
a door installed in the elevator car 4. Further, the elevator control device 100 judges
whether or not the operation mode may be switched on the basis of signals from switches,
detectors, and moreover the governor encoder 6. The site where the elevator control
device 100 is installed is not limited and, as an example, the elevator control device
100 may be installed in any of the interior of the pit 1b, a machine room (not shown
in the figure) at an upper part of the hoistway 1a, and the platform floors 1f.
[0028] The elevator control device 100 includes a calculator such as a microcomputer. The
calculator has a CPU (Central Processing Unit), a ROM (Read Only Memory), and a RAM
(Random Access Memory). Further, the calculator has an input section including a buffer
circuit.
[0029] Figure 2 is a circuit diagram of switches and detectors involved in maintenance work
of an elevator according to an embodiment. As shown in the figure, in an elevator
control device 100, a contact point of a platform door open/close detector 14a is
captured by an input buffer 14bu. Here, for example, the platform door open/close
detector 14a is a detector that is turned on in the state of closing a platform door
14 and turned off in the state of opening a platform door 14, the platform door open/close
detectors 14a at respective floors are connected in series, and the input buffer 14bu
is in an off state when one of the multiple platform door open/close detectors 14a
is turned off.
[0030] Further, in the elevator control device 100, a contact point of a car top stop switch
11 is captured by an input buffer 11bu. Here, the car top stop switch 11 is regarded
as a switch to stop an elevator car in the state of off as an example. On this occasion,
the car top stop switch 11 is connected in series to a car stop switch 12e and a pit
side car stop switch 15e, those having similar functions. Then by one of the switches
being off, the input buffer 11bu is in the state of off.
[0031] Further, in the elevator control device 100, the contact point on the normal mode
side is captured by an input buffer 12bu and the contact point on the maintenance
mode side is captured by an input buffer 12bu' in the contact points of an operation
mode selector switch 12a of a car top maintenance operation device 12. Likewise, the
contact point on the normal mode side is captured by an input buffer 15bu and the
contact point on the maintenance mode side is captured by an input buffer 15bu' in
the contact points of a pit side operation mode selector switch 15a of a pit maintenance
operation device 15. Moreover, in the elevator control device 100, a contact point
of a handrail switch 13a is captured by an input buffer 13bu.
«Detailed configuration of elevator control device»
[0032] Figure 3 is a block diagram of an elevator control device 100 according to an embodiment.
As shown in the figure, the elevator control device 100 has, as respective parts for
judging whether or not the operation mode of an elevator 1 should be switched, a maintenance
worker boarding/leaving judgment unit 101, a platform door open/close judgment unit
102, a switch confirmation unit 103, a switch operation permission unit 104, and an
operation control unit 105. Those respective units have the functions explained below.
A CPU in the elevator control device 100 reads and runs programs stored in a ROM,
and thus implements the functions.
<Maintenance worker boarding/leaving judgment unit 101>
[0033] The maintenance worker boarding/leaving judgment unit 101 monitors a signal from
a governor encoder 6. Further, the maintenance worker boarding/leaving judgment unit
101 acquires a position of an elevator car 4 on the basis of the signal from the governor
encoder 6. Furthermore, the maintenance worker boarding/leaving judgment unit 101
judges whether a maintenance worker boards or leaves the elevator car 4 on the basis
of change of the monitored signal of the governor encoder 6 and the acquired position
of the elevator car.
<Platform door open/close judgment unit 102>
[0034] The platform door open/close judgment unit 102 judges whether a platform door 14
closes or opens on the basis of a signal from a platform door open/close detector
14a. Further, the platform door open/close judgment unit 102 judges whether a platform
door 14 has changed from an open state to a close state or from a close state to an
open state on the basis of a signal from the platform door open/close detector 14a.
<Switch confirmation unit 103>
[0035] The switch confirmation unit 103 is a unit to confirm the state of a judgment switch
to judge whether or not the operation mode of an elevator 1 may be switched. The judgment
switch is any of a car top stop switch 11, an operation mode selector switch 12a,
a pit side operation mode selector switch 15a, and a handrail switch 13a. Further,
although the figure is not shown here, a car stop switch 12e and a pit side car stop
switch 15e are also captured by an input buffer identical to the contact point of
the car top stop switch 11 and hence act as judgment switches.
[0036] The switch confirmation unit 103 judges whether all of those judgment switches are
on a normal mode side or on a maintenance mode side.
<Switch operation permission unit 104>
[0037] The switch operation permission unit 104 permits the operation control unit 105 to
operate in a switched operation mode when an operation mode is switched by the operation
mode selector switch 12a of a car top maintenance operation device 12. In particular,
the switch operation permission unit 104 is connected to the maintenance worker boarding/leaving
judgment unit 101, the platform door open/close judgment unit 102, and the switch
confirmation unit 103 and permits operation in an operation mode selected by switching
the operation mode selector switch 12a on the basis of judgments at those units.
<Operation control unit 105>
[0038] The operation control unit 105 controls operation of the elevator 1 in an operation
mode selected by switching the operation mode selector switch 12a of the car top maintenance
operation device 12 when the switch operation permission unit 104 permits.
[0039] Meanwhile, functions included in the respective units constituting the aforementioned
elevator control device 100 are explained in more detail in the following elevator
control method.
«Elevator control method»
[0040] An elevator control method by an elevator control device 100 explained in reference
to Figures 2 and 3 is explained hereunder. A first elevator control method explained
here is a method of mode switching process from a normal mode to a maintenance mode
implemented by an elevator control device 100 when operation work of an elevator 1
starts. Further, a second elevator control method is a method of return process from
a maintenance mode to a normal mode implemented by an elevator control device 100
when operation work of an elevator 1 finishes.
[0041] Figure 4 is a flowchart showing procedures of maintenance work of an elevator by
a maintenance worker. A series of operations implemented by a maintenance worker are
explained hereunder in reference to Figure 4 before the elevator control methods implemented
by an elevator control device 100 are explained. Here, the states of switches operated
in respective operations are explained together.
[0042] A maintenance worker implements the following operations when maintenance work of
an elevator 1 starts. Firstly, the maintenance worker opens a platform door 14 (S1).
This allows a platform door open/close detector 14a to detect an off state. Successively,
the maintenance worker boards an upper part of an elevator car 4 (S2). This makes
the elevator car 4 heavier and lower and a governor encoder 6 detects a minute change
in the lowering of the elevator car 4. Further, the maintenance worker immediately
presses a car top stop switch 11 (S3). This turns the car top stop switch 11 off.
Successively, the maintenance worker assembles a handrail 13 and switches an operation
mode selector switch 12a of a car top maintenance operation device 12 to a maintenance
mode (S4). This makes a handrail switch 13a off and a maintenance mode side on and
a normal mode side off in the operation mode selector switch 12a.
[0043] After the operation mode selector switch 12a is switched to the maintenance mode
by implementing the above procedures, the maintenance worker implements maintenance
work of the elevator 1 by operation of an operation switch of the car top maintenance
operation device 12 (S5). Here, the operation switch includes a lift switch 12b, a
down switch 12c, and a travel switch 12d.
[0044] After the maintenance work finishes, the maintenance worker implements the following
operations for finishing the maintenance work of the elevator 1. Firstly, the maintenance
worker switches the operation mode selector switch 12a of the car top maintenance
operation device 12 to the normal mode and folds the handrail 13 (S6). This makes
the maintenance mode side off and the normal mode side on in the operation mode selector
switch 12a. Further, the handrail switch 13a is turned on. Successively, the maintenance
worker presses the car top stop switch 11 (S7). This makes the car top stop switch
11 on. Successively, the maintenance worker leaves the upper part of the elevator
car 4 (S8). This makes the elevator car 4 lighter and rise and the governor encoder
6 detects a minute change in the rising of the elevator car 4. Finally, the maintenance
worker closes the platform door 14 (S9). This makes the platform door open/close detector
14a detect an on state.
[0045] Elevator control methods implemented by an elevator control device 100 when maintenance
work of an elevator is implemented by a maintenance worker as explained above are
explained hereunder on the basis of the flowcharts in Figures 5 to 7 in reference
to Figure 3. The processes shown in those flowcharts represent methods implemented
by programs constituting respective units of the elevator control device 100.
<First elevator control method>
[0046] Figure 5 is a flowchart showing a first elevator control method according to an embodiment.
The procedures shown in the figure are procedures of mode switching process from a
normal mode to a maintenance mode implemented by an elevator control device 100 when
maintenance work of an elevator 1 starts, and include the following steps.
[Step S101]
[0047] At Step S101, a platform door open/close judgment unit 102 judges whether or not
a platform door 14 opens. On this occasion, the platform door open/close judgment
unit 102 judges that the platform door 14 has opened (YES) from a close state because
a platform door open/close detector 14a reverses from on to off and the process advances
to the next Step S102. On other occasions, the platform door open/close judgment unit
102 judges that the platform door 14 does not open (NO) and Step S101 is repeated.
[0048] By this judgment, it is detected that a maintenance worker M has opened a closed
platform door 14 for maintenance work (operation S1 in Figure 4).
[Step S102]
[0049] At Step S102, a maintenance worker boarding/leaving judgment unit 101 acquires and
retains a position of an elevator car 4 on the basis of a signal from a governor encoder
6. The position of the elevator car 4 acquired here is defined as the position of
the elevator car 4 at the time when the platform door 14 is judged to have opened
(YES) at Step S101 before the maintenance worker boards the elevator car 4.
[Step S103]
[0050] At Step S103, a switch confirmation unit 103 judges whether or not all the judgment
switches have switched to a maintenance mode side. On this occasion, the switch confirmation
unit 103 confirms, as judgment switches, whether or not a car top stop switch 11 is
off, a handrail switch 13a is off, and a maintenance mode side is on and a normal
mode side is off in an operation mode selector switch 12a. Further at the same time,
the switch confirmation unit 103 confirms that a normal mode side is on in contact
points of a pit side operation mode selector switch 15a.
[0051] This makes the platform door open/close judgment unit 102 judge that a maintenance
worker has pressed the car top stop switch 11 (operation S3 in Figure 4), has assembled
the handrail 13, and has switched the operation mode selector switch 12a of the car
top maintenance operation device 12 to a maintenance mode (operation S4 in Figure
4).
[0052] The process advances to the next Step S104 when the switch confirmation unit 103
judges that all the judgment switches have switched to a maintenance mode side (YES)
or repeats the confirmation of Step S103 until all the judgment switches are judged
to have switched to a maintenance mode side (YES).
[Step S104]
[0053] At Step S104, the maintenance worker boarding/leaving judgment unit 101 acquires
a position of the elevator car 4 on the basis of a signal from the governor encoder
6. The position of the elevator car 4 acquired here is the position of the elevator
car 4 in the state where all the judgment switches are judged to have switched to
a maintenance mode side (YES) at Step S103.
[Step S105]
[0054] At Step S105, the maintenance worker boarding/leaving judgment unit 101 judges whether
or not a maintenance worker boards the elevator car 4. On this occasion, the maintenance
worker boarding/leaving judgment unit 101 judges that a maintenance worker boards
an upper part of the elevator car 4 (YES) when the position of the elevator car 4
has shifted downward in comparing the position of the elevator car 4 retained at Step
S102 with the position of the elevator car 4 detected at Step S104.
[0055] By judging at Step S105 that a maintenance worker boards an upper part of the elevator
car 4 (YES), it can be judged that a maintenance worker M has opened a platform door
14 (operation S1 in Figure 4) and successively has boarded an upper part of the elevator
car 4 (operation S2 in Figure 4). Further, by the judgment, it is confirmed that a
maintenance worker M boards an upper part of the elevator car 4 in the state of judging
that all the judgment switches have switched to a maintenance mode side (YES) at Step
S103.
[0056] Here, the process repeats Step S105 until it is judged that a maintenance worker
boards an upper part of the elevator car 4 (YES) and the process advances to the next
Step S106 when it is judged that a maintenance worker boards an upper part of the
elevator car 4 (YES).
[Step S106]
[0057] At Step S106, a switch operation permission unit 104 permits an operation control
unit 105 to operate for switching to a maintenance mode.
[0058] This makes the operation control unit 105 control travel of the elevator car 4 on
the basis of operation of an operation switch of the car top maintenance operation
device 12 (operation S5 in Figure 4) by a maintenance worker M who has boarded the
elevator car 4.
<Effect of first elevator control method>
[0059] According to the above first elevator control method and an elevator control device
100 to implement the method, operation of switching the operation mode from a normal
mode to a maintenance mode is permitted on the basis of a state where a maintenance
worker M boards or leaves an elevator car 4 judged at a maintenance worker boarding/leaving
judgment unit 101. It is therefore possible to prevent operation in a maintenance
mode from being implemented and an elevator car 4 from traveling in a state where
a maintenance worker M does not board the elevator car 4. Accordingly, it is possible
to improve safety in maintenance work of an elevator 1.
<Second elevator control method>
[0060] Figure 6 is a flowchart showing a second elevator control method according to an
embodiment. The procedures shown in the figure are procedures of return process from
a maintenance mode to a normal mode implemented by an elevator control device 100
when maintenance work of an elevator 1 finishes and include the following steps.
[Step S201]
[0061] At Step S201, a maintenance worker boarding/leaving judgment unit 101 judges whether
or not a maintenance worker M has left an elevator car 4. On this occasion, the maintenance
worker boarding/leaving judgment unit 101 monitors a signal from a governor encoder
6 and judges that the maintenance worker M has left the elevator car 4 (YES) when
it is detected that the position of the elevator car 4 has shifted upward at Step
S202 on the basis of the monitored signal. On this occasion, as an example, it is
also possible to judge that the maintenance worker M has left the elevator car 4 (YES)
when the elevator car 4 rises to the position retained at Step S102 of the mode switching
process to a maintenance mode.
[0062] The process advances to the next Step S202 when the maintenance worker boarding/leaving
judgment unit 101 judges that a maintenance worker M has left the elevator car 4 (YES),
or repeats judgment of Step S201 until it is judged that a maintenance worker M has
left the elevator car 4 (YES).
[Step S202]
[0063] At Step S202, the maintenance worker boarding/leaving judgment unit 101 retains the
position of the elevator car 4 when the maintenance worker boarding/leaving judgment
unit 101 judges that a maintenance worker M has left the elevator car 4 (YES) at Step
S201.
[Step S203]
[0064] At Step S203, a switch confirmation unit 103 judges whether or not all the judgment
switches have switched to a normal mode side. On this occasion, the switch confirmation
unit 103 confirms, as judgment switches, whether or not a maintenance mode side is
off and a normal mode side is on in an operation mode selector switch 12a, a handrail
switch 13a is on, and a car top stop switch 11 is on. Further, at the same time, the
switch confirmation unit 103 confirms that a normal mode side is on in contact points
of a pit side operation mode selector switch 15a.
[0065] This makes a platform door open/close judgment unit 102 judge that a maintenance
worker has switched the operation mode selector switch 12a of a car top maintenance
operation device 12 to a normal mode, has folded a handrail 13 (operation S6 in Figure
4), and has pressed the car top stop switch 11 (operation S7 in Figure 4) .
[0066] The process advances to the next Step S204 when the switch confirmation unit 103
judges that all the judgment switches have switched to an operation mode side (YES).
[0067] Otherwise, the process returns to Step S201 until the switch confirmation unit 103
judges that the all the judgment switches have switched to an operation mode side
(YES) and repeats Steps S201 to S203.
[0068] This prevents the return process from advancing to the next Step S204 in the state
where a maintenance worker M still boards the elevator car 4 when the maintenance
worker M boards and leaves the elevator car 4 repeatedly in the middle of switch operation
of the judgment switches. In other words, the return process advances to Step S204
only when all the judgment switches have switched to an operation mode side in the
state where a maintenance worker M has left the elevator car 4 (operation S8 in Figure
4).
[Step S204]
[0069] At Step S204, a platform door open/close judgment unit 102 judges whether or not
a platform door 14 has closed. On this occasion, the platform door open/close judgment
unit 102 judges that the platform door 14 has closed from an open state (YES) because
a platform door open/close detector 14a detects reversion from off to on, and the
process advances to the next Step S205. On other occasions, the platform door open/close
judgment unit 102 judges that the platform door 14 does not close (NO) and Step S204
is repeated.
[0070] By this judgment, it is detected that a maintenance worker M has implemented the
operation of closing the platform door 14 (operation S9 in Figure 4) in order to finish
the maintenance work.
[Step S205]
[0071] At Step S205, the maintenance worker boarding/leaving judgment unit 101 acquires
the position of the elevator car 4 on the basis of a signal from the governor encoder
6. The position of the elevator car 4 acquired here is defined as the position of
the elevator car 4 at the time when the platform door 14 closes.
[Step S206]
[0072] At Step S206, the maintenance worker boarding/leaving judgment unit 101 judges whether
or not a maintenance worker has left the elevator car 4. On this occasion, the maintenance
worker boarding/leaving judgment unit 101 judges that a maintenance worker M has left
the elevator car 4 (YES) when the maintenance worker boarding/leaving judgment unit
101 confirms that the position of the elevator car 4 does not change by comparing
the position of the elevator car 4 retained at Step S202 with the position of the
elevator car 4 detected at S205. Then when the maintenance worker boarding/leaving
judgment unit 101 judges that a maintenance worker has left the elevator car 4 (YES),
the process advances to Step S207. In contrast, on other occasions, the maintenance
worker boarding/leaving judgment unit 101 judges that a maintenance worker does not
leave the elevator car 4 (NO), and the process advances to Step S206'.
[Step S206']
[0073] Meanwhile, at Step S206', the maintenance worker boarding/leaving judgment unit 101
instructs an operation control unit 105 to raise an alarm. As a result, the operation
control unit 105 judges that the platform door 14 may possibly close while a maintenance
worker M still remains at an upper part of the elevator car 4 for example, and makes
displays installed in an elevator 1 and an external system for operating the elevator
1 display the alarm. Alternatively, an alarm may be sounded from a speaker.
[0074] Successively, the process returns to Step S204, and repeats the judgment whether
or not the platform door 14 has closed from an open state by the platform door open/close
judgment unit 102 and subsequent steps. As a result, the return process can advance
to the next Step S207 only when the platform door 14 closes from an open state in
a state where a maintenance worker M leaves the elevator car 4.
[Step S207]
[0075] At Step S207, a switch operation permission unit 104 permits the operation control
unit 105 to operate in the state of being switched to a normal mode. On this occasion,
the switch operation permission unit 104 judges that an operation mode is never implemented
while a maintenance worker M remains at an upper part of the elevator car 4 because
it is confirmed that a maintenance worker has left the elevator car 4 at Step S206,
and permits operation in a normal mode. Then the operation control unit 105 implements
operation control of an elevator 1 in a normal mode.
<Effect of second elevator control method>
[0076] According to the above second elevator control method and an elevator control device
100 to implement the method, operation of switching the operation mode from a maintenance
mode to a normal mode is permitted on the basis of a state where a maintenance worker
M boards or leaves an elevator car 4 judged at a maintenance worker boarding/leaving
judgment unit 101. Then the configuration of permitting return to a normal mode only
when it is confirmed that a maintenance worker M has surely left the elevator car
4 can be obtained. The operation mode therefore returns from a maintenance mode to
a normal mode only after a maintenance worker M has left the elevator car 4 and has
been evacuated from the interior of a hoistway 1a toward a platform floor 1f, and
it is possible to provide an elevator control device 100, an elevator 1, and an elevator
control method, which allow safety of a maintenance worker M to be secured.
[0077] As a result, safety can be improved in maintenance work of an elevator 1. Moreover,
safety can be improved at a low cost without the need of installing specific equipment
at each of platform floors 1f.
[0078] Further, the aforementioned switching to a normal mode is permitted only when a platform
door open/close judgment unit 102 judges that a platform door 14 has changed to a
close state in a state where a maintenance worker boarding/leaving judgment unit 101
judges that a maintenance worker M has left an elevator car 4. This makes safety further
improve in maintenance work of an elevator 1.
<Modified example of second elevator method>
[0079] Figure 7 is a flowchart showing a modified example of the second elevator control
method according to an embodiment. A control method of the modified example shown
in the figure is a method of implementing Step S205' in place of Steps S205 to S206'
in the second elevator control method shown in Figure 6. Step S205' is as follows.
[Step S205']
[0080] At Step S205', a maintenance worker boarding/leaving judgment unit 101 judges whether
or not a predetermined time has elapsed after the maintenance worker boarding/leaving
judgment unit 101 judges that a maintenance worker M has left an elevator car 4 (YES)
at Step S201. On this occasion, the maintenance worker boarding/leaving judgment unit
101 judges whether or not a predetermined time has elapsed in a state where the position
of the elevator car 4 retained at Step S202 is maintained on the basis of a signal
from a governor encoder 6.
[0081] Otherwise, the maintenance worker boarding/leaving judgment unit 101 may also judge
whether or not a predetermined time has elapsed after a platform door open/close judgment
unit 102 judges that a platform door 14 has closed (YES) at Step S204 if it is after
the maintenance worker boarding/leaving judgment unit 101 judges that a maintenance
worker M has left an elevator car 4 (YES) at Step S201.
[0082] The predetermined time in the above judgment may be any time as long as it is enough
time for a maintenance worker having left an elevator car 4 to close a platform door
14, and is set at a time in about one to three minutes as an example.
[0083] The process advances to Step S207 when it is judged that a predetermined time has
elapsed (YES), or repeats Step S205' until it is judged that a predetermined time
has elapsed (YES). By implementing this judgment too, it is judged that a maintenance
worker M has surely left an elevator car 4. Effects similar to the second elevator
control method and an elevator control device 100 in which the second elevator control
method is implemented therefore can be obtained.
[0084] Meanwhile, the present invention is not limited to the embodiments and modified examples
stated above, and further includes various modified examples. For example, the above
embodiments are explained in detail for the present invention to be comprehensible
and the present invention is not necessarily limited to the case having all the explained
configurations. Further, a part of a configuration in an embodiment can be replaced
with a configuration of another embodiment or a configuration of an embodiment can
be added to a configuration of another embodiment. Furthermore, a part of a configuration
in an embodiment can be added to, deleted from, or replaced with another configuration.
Reference Signs List
[0085]
1... elevator
1a... hoistway
4... elevator car
6... governor encoder
12a... operation mode selector switch
14... platform door
14a... platform door open/close detector
11... car top stop switch
13a... handrail switch
15a... pit side operation mode selector switch
100... elevator control device
101... maintenance worker boarding/leaving judgment unit
102... platform door open/close judgment unit
103... switch confirmation unit
104... switch operation permission unit
105... operation control unit
M... maintenance worker