JP2013237518A - Elevator car-locking device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elevator car-locking device capable of moving the safety function without fail after a maintenance check job of an elevator.SOLUTION: A car-locking device 1 includes: a locking mechanism 2 which performs locking and releasing of an elevator car between the car and the hoistway where the car moves up and down inside; and a safety mechanism 3 which turns off the power of a car drive device when the car is locked by the locking mechanism 2. The safety mechanism 3 can switch the power of the drive device from OFF to ON by changing the statuses when the car is locked.

Description

  Embodiments described herein relate generally to an elevator car fixing device.

  In conventional elevators, an elevator car (hereinafter referred to as a “car”) is secured to a hoistway to ensure the safety of maintenance and inspection work, and the car that can switch off the power source of a driving device that drives the car. Some have fixed devices installed.

JP 2009-40570 A

  Elevator maintenance and inspection operations include operations that require driving a part of the car drive device, such as brake gap adjustment. However, since the conventional elevator car fixing device is configured to fix the car and turn off the power at the same time, in order to perform such work, a safety function (such as a limit switch) for turning off the power is temporarily provided. In some cases, a procedure such as removing a part that operates the safety mechanism is necessary to stop the operation. For this reason, there is a possibility that the safety function may be lost due to forgetting to attach the removed parts after the maintenance and inspection work.

  The problem to be solved by the present invention is to provide an elevator car fixing device that can reliably operate a safety function after elevator maintenance and inspection work.

  The elevator car fixing device according to the embodiment of the present invention fixes the elevator car and stops the elevator. This car fixing device includes a locking mechanism that fixes and releases the car to and from a hoistway in which the car moves up and down, and a safety mechanism that turns off the power of the car driving device when the car is fixed by the locking mechanism. The safety mechanism is characterized in that the power of the drive device is switched from off to on when the car is fixed by changing the state.

The perspective view which shows schematic structure of the elevator car fixing device which concerns on embodiment. The perspective view which shows the state which the cam surface of the normal state contact | abutted with the roller of the limit switch in the elevator car fixing device which concerns on embodiment. The perspective view which shows the state which the cam surface switched to the inversion state in the elevator car fixing device which concerns on embodiment. The perspective view which shows the state which the cam surface of the reverse state contact | abutted with the roller of the limit switch in the elevator car fixing device which concerns on embodiment.

  Hereinafter, an elevator car fixing device according to an embodiment will be described in detail with reference to the drawings. In the following drawings, the same or corresponding parts are denoted by the same reference numerals, and the description thereof will not be repeated. The vertical direction used in the following description is based on the vertical direction of the drawings.

  First, with reference to FIG. 1, the structure of the elevator car fixing device according to this embodiment will be described. FIG. 1 is a perspective view showing a schematic configuration of an elevator car fixing device according to an embodiment of the present invention.

  A car fixing device 1 shown in FIG. 1 is used for an elevator having a general configuration such as an MRL (Machine Roomless) elevator. The car fixing device 1 fixes the elevator car (hereinafter referred to as “car”) on which a passenger is placed during the elevator maintenance inspection to the inside of the hoistway, stops the raising / lowering operation of the car, This is to ensure safety.

  As shown in FIG. 1, the car fixing device 1 includes a locking mechanism 2 and a safety mechanism 3.

  The locking mechanism 2 fixes and releases the car between the hoistway in which the car moves up and down. The locking mechanism 2 includes an operation unit 4 installed on the ceiling of the car and a fixing unit 5 fixed on the inner wall surface of the car hoistway.

  The operation unit 4 is provided with a rod 6 that can move between the fixed unit 5 on the hoistway. The rod 6 is arranged so that the axis extends toward the fixed part 5 on the hoistway outside the car, and can proceed in the longitudinal direction from the car side to the fixed part 5 along this axial direction. It is also possible to retreat from the fixed portion 5 side to the car side. The shape of the rod 6 can be a cylindrical shape as shown in FIG.

  The fixed portion 5 is formed with an insertion hole 7 into which the distal end portion of the rod 6 can be inserted when the rod 6 of the operation portion 4 is advanced, thereby locking the rod 6. The shape of the insertion hole 7 is a shape centering on the axis of the rod 6, and in the example of FIG. 1, it is a circular shape corresponding to the cylindrical rod.

  The locking mechanism 2 is configured such that, for example, when an operator performs maintenance and inspection of an elevator, the operator operates the operation unit 4 to insert the tip end of the rod 6 into the insertion hole 7 of the fixing unit 5 (see FIG. 2), thereby The car can be locked by being locked to the wall surface of the car and the raising / lowering movement of the car can be restricted. Further, by pulling out the rod 6 inserted into the insertion hole 7 of the fixed portion 5, the locked state with the car and the hoistway can be released, and the car can be raised and lowered.

  The safety mechanism 3 turns off a power supply circuit that supplies power to a driving device such as a hoisting machine for driving the car up and down when the car is fixed by the locking mechanism 2. The safety mechanism 3 includes a limit switch 8, a lever 9 connected to the limit switch 8, a roller 10 pivotally supported at the tip of the lever 9, and a roller when the rod 6 of the locking mechanism 2 moves. 10 and a cam member 11 having a cam surface 12a capable of abutting on the cam surface.

  The limit switch 8 has a contact contacting / separating mechanism inside and is connected to a power supply circuit of a car driving device. When the lever 9 connected to the limit switch 8 rotates, the contact contacting / separating mechanism inside the limit switch 8 is configured to open and close by the force of a spring incorporated therein, thereby turning on and off the power supply circuit. ing.

  More specifically, the position where the lever 9 extends in the vertical direction and the roller 10 is disposed at the lower end of the lever is referred to as a “normal position”, and the lever 9 is not illustrated so as to maintain the normal position. Always energized by the energizing means. In the state where the cam surface 12a of the cam member 11 does not contact the roller 10 (the state shown in FIGS. 1 and 3), the lever 9 is not subjected to external force, so the lever 9 and the roller 10 are held in this normal position. At this time, the limit switch 8 is deactivated and the power supply circuit is turned on.

  On the other hand, when the car fixing device 1 is operated to move the rod 6 and the cam surface 12a of the cam member 11 is in contact with the roller 10 (the state shown in FIGS. 2 and 4), the lever 9 is externally applied via the roller 10. Therefore, the lever 9 rotates from the normal position in the contact release direction of the contact contact / separation mechanism. At this time, the limit switch 8 is activated and turns off the power supply circuit.

  The cam member 11 is fixed to an end surface 6a (see FIG. 3) at the rear end of the car side of the rod 6 (the side opposite to the boarding / alighting path and the fixing portion 5). The cam member 11 includes an inclined plate 12 having a cam surface 12a, a first plate 13 formed integrally with the inclined plate 12, a second plate 14, and a hinge that connects the first plate 13 and the second plate 14. A shaft 15 is provided.

  The cam member 11 has a hinge structure in which the first plate 13 and the second plate 14 are rotatable about a hinge shaft 15. As shown in FIG. 1, in the cam member 11, the first plate 13 and the second plate 14 are fixed to the end surface 6 a of the rod 6 in parallel with a hinge shaft 15 extending in the vertical direction. Such a fixed state of the cam member 11 is hereinafter referred to as a “normal state”. Three holes are formed in the first plate 13 and the second plate 14 along the vertical direction at positions that are line-symmetric with respect to the hinge shaft 15. In the normal state, the first plate 13 is fixed to the rod 6 at one location in the middle hole by screws 16a, and the second plate 14 is fixed to the rod 6 at two locations in the upper and lower holes by screws 16b and 16c. ing. That is, the cam member 11 is fixed to the rod 6 at three points by screws 16a, 16b, and 16c.

  In the normal state, the inclined plate 12 of the cam member 11 is arranged so that the cam surface 12a faces in the traveling direction of the rod 6, in other words, in the direction of the fixed portion 5. That is, as shown in FIG. 1, if the roller 10 is positioned on the fixed portion 5 side from the rear end of the rod 6, the cam surface 12 a can come into contact with the roller 10 when the rod 6 is advanced. In the normal state, the normal direction of the cam surface 12a is obliquely above the traveling direction of the rod 6, the lower end of the cam surface 12a is on the front side in the traveling direction of the rod 6, and the upper end is on the rear side in the traveling direction of the rod 6. Be placed.

  Further, particularly in the present embodiment, the cam member 11 can be switched from the normal state to the “reversed state” in which the cam surface 12a of the cam member 11 is reversed in the retracting direction of the rod 6 (see FIG. 3). . The screw 16a for fixing the first plate 13 is removed, the first plate 13 is rotated toward the second plate 14 with the hinge shaft 15 as the rotation center, and the first plate 13 is folded on the second plate 14, The first plate 13 is fastened and fixed with screws 16a. As a result, the inclined plate 12 is reversed together with the first plate 13 to the second plate 14 side, so that the cam surface 12a is disposed in the reversed state in which the cam surface 12a faces the reverse direction of the rod, in other words, the direction opposite to the fixed portion 5. Become. At this time, if the rear end of the rod is positioned closer to the fixed part than the roller 10 as shown in FIG. 3, the cam surface 12 a can contact the roller 10 when the rod 6 is retracted. In the inverted state, the normal direction of the cam surface 12a is obliquely upward in the retraction direction of the rod 6, the lower end of the cam surface 12a is disposed on the front side in the retraction direction of the rod, and the upper end is disposed on the rear side in the retraction direction of the rod. The

  Thus, the cam member 11 can change the state of the cam surface 12a. More specifically, the cam member 11 can change the direction of the cam surface 12 a to a reverse state in which the limit switch 8 is reversed from the normal state in which the limit switch 8 can be operated when the rod 6 is traveling.

  Next, with reference to FIGS. 1-4, the effect | action and effect of the elevator car fixing device which concern on this embodiment are demonstrated. FIG. 2 is a perspective view showing a state in which a cam surface in a normal state is in contact with a roller of a limit switch in the elevator car fixing device according to the present embodiment, and FIG. 3 is an elevator car according to the present embodiment. FIG. 4 is a perspective view showing a state in which the cam surface is switched to the inverted state in the fixing device, and FIG. 4 is a diagram showing a state in which the cam surface in the inverted state contacts the limit switch roller in the elevator car fixing device according to the present embodiment. It is a perspective view which shows a state.

(Operation 1)
First, as shown in FIG. 1, when the cam surface 12 a of the cam member 11 is in a normal state, when the rod 6 is advanced to the insertion hole 7 of the fixing portion 5, the cam surface 12 a comes into contact with the roller 10. At this time, the roller 10 is guided in the advancing direction by the cam surface 12a while rotating and moving from the lower end side to the upper end side of the cam surface 12a, and accordingly, the lever 9 rotates in the advancing direction as shown in FIG. As a result, the limit switch 8 is activated, and the power circuit of the elevator is turned off. Further, in the state where the rod 6 is inserted into the insertion hole 7, the roller 10 continues to be urged in the traveling direction by the cam surface 12a, so that the operating state of the limit switch 8 is maintained.

  As described above, when the cam surface 12 a of the cam member 11 is in the normal state, the safety mechanism 3 can turn off the power of the car driving device when the car is fixed by the locking mechanism 2. As a result of this operation 1, in the elevator equipped with the car fixing device 1, the rod 6 is inserted into the insertion hole 7 of the fixing portion 5, the car is fixed to the hoistway, and the power supply circuit is turned off. It becomes a state.

  The car fixing device 1 realizes such a state in which the power source of the car driving device is turned off when the car is fixed, so that the car driving device and the control device that perform the car maintenance are inspected. The lifting / lowering operation can be completely stopped and the safety of the worker can be ensured.

(Operation 2)
In the state shown in FIG. 2 after the above operation 1, the cam surface 12a of the cam member 11 receives an urging force from the roller 10 in the direction in which the lever 9 returns to the normal position. At this time, if the screw 16a of the first plate 13 of the cam member 11 is removed, the inclined plate 12 and the first plate 13 of the cam member 11 cannot resist the urging force that the cam surface 12a receives from the roller 10. For this reason, the inclined plate 12 and the first plate 13 are pushed by the roller 10 and rotate around the hinge shaft 15, and the first plate 13 is folded to the second plate 14 side as shown in FIG. . Here, the first plate 13 is fixed to the end surface 6a of the rod 6 by the screw 16a through the middle hole, so that the cam surface 12a of the cam member 11 changes to the inverted state.

  When the cam surface 12a changes from the normal state to the reverse state, the cam surface 12a is separated from the roller 10. For this reason, since the roller 10 does not receive the external force in the traveling direction from the cam surface 12a, the lever 9 and the roller 10 are returned to the normal position by the biasing force received by the lever 9. Thereby, the limit switch 8 is switched from the operating state to the non-operating state, and the power supply circuit of the elevator is switched from OFF to ON.

  As a result of this operation 2, the elevator equipped with the car fixing device 1 is in a state in which the rod 6 is inserted into the insertion hole 7 of the fixing portion 5 and the car is fixed to the hoistway, and the power supply circuit is turned on. It becomes.

  Among elevator maintenance and inspection work, there is work that needs to drive a part of the car drive device such as brake gap adjustment. In order to perform this operation while fixing the car to the hoistway, it is necessary to realize a state in which the power source of the car driving device is turned on when the car is fixed.

  In the conventional car fixing device, in order to create such a state, the cam member for operating the limit switch when the car is fixed is detached from the rod 6 while the rod 6 is locked to the fixing part 5 and the limit switch is operated. Had to be deactivated. In this case, when the rod 6 is pulled out from the fixing portion 5 after the work is finished, there is a possibility that the cam member may be forgotten to be attached, so that the safety mechanism may not function when the car is fixed again.

  On the other hand, in the car fixing device 1 of this embodiment, since the cam member 11 has a hinge structure, the direction of the cam surface 12a is changed between the normal state in the traveling direction of the rod 6 and the reversal strip in the retracting direction of the rod 6. It is possible to switch to. With this configuration, the cam surface 12a is changed from the normal state to the inverted state when the car is fixed, as in the above-described operation 2, so that the cam member 11 is not detached from the rod 6 and the car drive device is fixed when the car is fixed. A state of turning on the power can be realized. Therefore, it is possible to perform maintenance and inspection work that requires driving a part of the car drive device, such as brake gap adjustment, while the cam member 11 is attached to the rod 6. As a result, the car fixing device 1 can prevent the loss of the safety function due to forgetting to attach the cam member, and can reliably operate the safety function after the elevator maintenance and inspection work.

(Operation 3)
Further, when returning the elevator from the state shown in FIG. 3 after the above operation 2 to a state in which the elevator can be raised and lowered, the rod 6 is first extracted from the insertion hole 7 of the fixing portion 5 as shown in FIG. . At this time, since the cam surface 12a is in the reverse state and remains in the retreating direction, the cam surface 12a of the cam member 11 contacts the roller 10 when the rod 6 moves in the retreating direction. When the rod 6 is further moved in the retraction direction while the cam surface 12a is in contact with the roller 10, the roller 10 receives an external force in the retraction direction from the cam surface 12a, so that the roller 10 extends from the lower end side to the upper end side of the cam surface 12a. Then, the cam 9 is guided in the retraction direction by the cam surface 12a, and the lever 9 is rotated in the retraction direction as shown in FIG. As a result, the limit switch 8 is activated, and the power circuit of the elevator is turned off. Further, since the roller 10 is continuously urged in the retraction direction by the cam surface 12a, the operating state of the limit switch 8 is maintained.

  Thus, when the cam surface 12a of the cam member 11 is in the inverted state, the safety mechanism 3 can turn off the power of the car driving device when the car is released by the locking mechanism 2. As a result of this operation 3, the elevator provided with the car fixing device 1 is in a state in which the rod 6 is pulled out from the insertion hole 7 of the fixing portion 5 to be unlocked from the car and the hoistway, and the power circuit Is turned off.

  In the car fixing device 1 of the present embodiment, the rod 6 locked to the fixing portion 5 is moved backward while the direction of the cam surface 12a of the cam member 11 is changed to the inverted state as in the above operation 3. The limit switch 8 is actuated by the cam surface 12a. That is, after the cam surface 12a of the cam member 11 is switched to the inverted state and the elevator maintenance and inspection work is performed, the limit switch 8 is activated when the rod 6 is returned to the original position, and the power supply circuit is turned off. As a result, the operator of the maintenance inspection work can be made aware that it is necessary to return the cam surface 12a of the cam member 11 from the inverted state to the normal state, and forgetting to return the cam surface 12a can be prevented. Safety functions can be operated more reliably after elevator maintenance and inspection work.

  After this operation 3, the screw 16a is removed, the first plate 13 of the cam member 11 is unfolded and returned to the normal position, and the first plate 13 is fixed to the end surface 6a of the rod 6 again by the screw 16a. Thus, the cam surface 12a returns to the normal state. When the cam surface 12a is returned to the normal state, the cam surface 12a is separated from the roller 10 and the roller 10 does not receive any external force in the retraction direction from the cam surface 12a. At the same time, the lever 9 and the roller 10 are returned to their normal positions. As a result, the limit switch 8 is deactivated, and the power supply circuit of the elevator is turned on. As a result, in the elevator provided with the car fixing device 1, the power supply circuit is turned on, and the car returns to a state in which the car can be raised and lowered.

  As described above, in the car fixing device 1 of the present embodiment, when the cam surface 12a of the cam member 11 is in the normal state, the safety mechanism 3 is used when the car is fixed by the locking mechanism 2. When the cam surface 12a is in the inverted state, the safety mechanism 3 turns off the power of the car drive device when the car is released by the locking mechanism 2. It becomes the state of. In other words, a mechanism for switching the cam surface 12a of the cam member 11 between the normal state and the reversed state, specifically, the components including the inclined plate 12, the first plate 13, and the hinge shaft 15 of the cam member 11 are in the first state. And function as a switching mechanism capable of switching between the second state.

  Although the embodiment of the present invention has been described, the above embodiment is presented as an example, and is not intended to limit the scope of the invention. The above embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. The above-described embodiments and modifications thereof are included in the invention described in the scope of claims and the equivalents thereof, as long as they are included in the scope and spirit of the invention.

  In the said embodiment, the MRL elevator was illustrated as an elevator provided with the car fixing device 1. FIG. Since the MRL elevator is provided with a control device and a power circuit in the hoistway, it is particularly preferable to apply the car fixing device 1 of the present embodiment that can ensure the safety of maintenance and inspection work. The fixing device 1 can also be applied to other types of elevators such as an elevator with a machine room.

  In the above embodiment, the cam member is a component that can change the state to switch the limit switch 8 from the operating state to the non-operating state and switch the power supply of the driving device from OFF to ON when the car is fixed. 11 cam surfaces 12a are illustrated, but other components may be used as long as the operation / non-operation of the limit switch 8 can be switched in accordance with the state change. The “state change” used in the present embodiment means a physical operation such that the direction of the cam surface 12a is reversed with the hinge shaft 15 as a rotation axis as described above.

DESCRIPTION OF SYMBOLS 1 Car fixing device 2 Locking mechanism 3 Safety mechanism 4 Operation part 5 Fixing part 6 Rod 7 Insertion hole 8 Limit switch 9 Lever 10 Roller 11 Cam member 12 Inclined plate 12a Cam surface

Claims (3)

An elevator car fixing device that fixes an elevator car and stops raising and lowering.
A locking mechanism for fixing and releasing the car with a hoistway in which the car moves up and down;
A safety mechanism that turns off the power of the car drive device when the car is fixed by the locking mechanism;
With
The elevator car fixing device according to claim 1, wherein the safety mechanism is capable of switching the power supply of the driving device from off to on when the car is fixed by changing the state. The locking mechanism is
A rod installed in the car and capable of moving back and forth in the longitudinal direction from the car side to the hoistway side;
A fixing portion that is installed in the hoistway and that can fix the car by locking the rod when the rod travels;
The safety mechanism is
A limit switch connected to turn off the drive when activated, and
A cam member installed on the rod of the locking mechanism and having a cam surface capable of operating the limit switch when the rod is moving;
The cam member is configured to operate the limit switch and maintain this operating state by guiding the limit switch to the moving direction side of the rod by the cam surface when the rod advances.
The limit switch of the safety mechanism is fixed when the car is fixed by changing the direction of the cam surface of the cam member from a normal state in which the limit switch can be operated when the rod is advanced to an inverted state. The elevator car fixing device according to claim 1, wherein the elevator car is switched from an operating state to a non-operating state.   The safety mechanism causes the limit switch to be moved by the cam surface when the rod locked to the fixed portion is moved backward while the direction of the cam surface of the cam member is changed to the inverted state. The elevator car fixing device according to claim 2, wherein the elevator car fixing device is configured to be operated.

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