CN117320991A

CN117320991A - Emergency stop device, elevator, and method for recovering emergency stop device

Info

Publication number: CN117320991A
Application number: CN202280034541.9A
Authority: CN
Inventors: 早川智久; 座间秀隆; 伊藤康司; 久保洋辅
Original assignee: Hitachi Ltd
Current assignee: Hitachi Ltd
Priority date: 2021-05-27
Filing date: 2022-04-18
Publication date: 2023-12-29
Also published as: JP7569268B2; JP2022181743A; EP4349757A1; WO2022249793A1

Abstract

The emergency stop device is provided with a braking mechanism, a lifting member, a driving mechanism and an operating mechanism. The lifting member is connected with a brake piece of the brake mechanism. The driving mechanism has a connection portion connected to the pulling member, and operates the braking mechanism. The working mechanism is connected with the driving mechanism to make the driving mechanism work. The connecting portion transmits only the upward force in the lifting direction with respect to the pulling member.

Description

Emergency stop device, elevator, and method for recovering emergency stop device

Technical Field

The present invention relates to an emergency stop device for stopping an elevator car in an emergency, an elevator provided with the emergency stop device, and a method for recovering the emergency stop device.

Background

In general, a sling-type elevator has a main sling for connecting an elevator car to a counterweight, a compensating sling, and a long object such as a governor sling used for detecting the speed of the elevator car or the counterweight. In addition, in an elevator, an emergency stop device is provided as a safety device for automatically stopping the operation of an elevator car when the speed of the elevator car moving up and down along a guide rail exceeds a predetermined value.

In recent years, an emergency stop device has been proposed in which a brake mechanism of the emergency stop device is electrically operated without using a governor. As a conventional emergency stop device of this kind, for example, a technique described in patent document 1 is known. Patent document 1 describes an emergency stop device provided with a brake mechanism, a drive mechanism, and an operating mechanism. The drive mechanism includes a pulling member, a link member, a drive shaft, and a drive spring. The driving spring is arranged on the driving shaft and applies force to the driving shaft in the direction of pulling the braking piece. The operating mechanism includes a connecting member, a movable core, an electromagnetic core, and a holding recovery mechanism. The connecting member is connected to the other end portion of the link member. The movable core is fixed to the connecting member. The electromagnetic iron core makes the movable iron core absorb and separate. The holding restoring mechanism moves the electromagnetic core in a direction approaching and separating from the movable core.

Prior art literature

Patent literature

Patent document 1: japanese patent laid-open No. 2020-83579

Disclosure of Invention

Problems to be solved by the invention

However, in the technique described in patent document 1, when the restoring operation is performed, the driving unit provided in the operating mechanism is operated, the pulling member is pressed against the urging force of the driving spring, and the rail is released from the grip by the brake of the brake mechanism. As a result, in the technique described in patent document 1, the driving unit of the operating mechanism needs to be large in size, not only to overcome the force of the urging force of the driving spring, but also to release the force of the holding of the brake.

In the technique described in patent document 1, it is necessary to drive the driving unit of the operating mechanism and raise the elevator car to release the brake during the return operation. As described above, the technique described in patent document 1 has a problem that control of various devices during the recovery operation becomes complicated.

In view of the above, an object of the present invention is to provide an emergency stop device, an elevator, and a method for recovering an emergency stop device, which can reduce the size of a driving unit of an operating mechanism and facilitate recovery operation.

Means for solving the problems

In order to solve the above problems and achieve the object, an emergency stop device includes a brake mechanism, a pulling member, a driving mechanism, and an operating mechanism. The brake mechanism is provided with a guide rail brake piece which is arranged on the lifting body and clamps the lifting body to slide, and the brake mechanism stops the movement of the lifting body. The lifting component is connected with the brake piece. The driving mechanism has a connection portion connected to the pulling member, and operates the braking mechanism. The working mechanism is connected with the driving mechanism and enables the driving mechanism to work. The connecting portion transmits only the upward force in the lifting direction with respect to the pulling member.

The elevator further comprises a lifting body which moves up and down in the lifting channel, wherein,

the elevator is provided with: a guide rail vertically installed in the elevating channel and supporting the elevating body to be capable of sliding; and an emergency stop device for stopping the movement of the lifting body based on the state of the lifting movement of the lifting body. The emergency stop device described above is used as the emergency stop device.

In the method for restoring an emergency stop device, the emergency stop device has the above-described configuration and includes steps (1) to (2) described below.

(1) And a step of releasing the load from the drive mechanism to the brake in the upward and downward direction by performing a return operation of the operating mechanism.

(2) And a step of lifting the lifting body to release the clamping of the guide rail by the brake when the recovery operation of the operating mechanism is completed.

Effects of the invention

According to the emergency stop device, the elevator, and the method for recovering the emergency stop device having the above-described configuration, the drive unit of the operating mechanism can be reduced in size, and recovery operation can be easily performed.

Drawings

Fig. 1 is a schematic configuration diagram of an elevator according to an embodiment.

Fig. 2 is a front view showing an emergency stop device according to an example of embodiment.

Fig. 3 is a diagram showing a brake mechanism of the emergency stop device according to the embodiment, fig. 3A is a front view, and fig. 3B is a cross-sectional view.

Fig. 4 is a front view showing an operation mechanism of the emergency stop device according to the embodiment.

Fig. 5 is a front view showing a state in which an operating mechanism of the emergency stop device according to the embodiment operates.

Fig. 6 is an explanatory diagram showing a return operation of the emergency stop device according to the embodiment.

Fig. 7 is a flowchart showing a recovery operation of the emergency stop device according to the embodiment.

Detailed Description

An emergency stop device, an elevator, and a method for recovering the emergency stop device according to an embodiment will be described below with reference to fig. 1 to 7. In the drawings, common members are denoted by the same reference numerals.

1. Description of the embodiments

1-1 structural example of an Elevator

First, the structure of an elevator according to an embodiment (hereinafter, referred to as "this example") will be described with reference to fig. 1.

Fig. 1 is a schematic configuration diagram showing a configuration example of an elevator according to this example.

As shown in fig. 1, the elevator 1 of the present example performs a lifting operation in a lifting passage 110 formed in a building structure. The elevator 1 includes an elevator car 120 indicating one example of a lifting body for carrying persons and cargoes, a main sling 130, and a counterweight 140 indicating the other example of the lifting body.

The elevator 1 further includes a hoist 100 and an emergency stop device 5.

The elevator 1 further includes a control unit 170 and a diverting pulley 150. The elevation passage 110 is formed in the building structure, and a machine room 160 is provided at the top thereof.

A hoisting machine 100 and a diverting pulley 150 are disposed in the machine room 160. A main rope 130 is wound around the sheave of the hoist 100. A diverting pulley 150 to which the main rope 130 is attached is provided near the hoisting machine 100.

The upper part of the elevator car 120 is connected to one end of the main sling 130, and the upper part of the counterweight 140 is connected to the other end of the main sling 130. The elevator car 120 and the counterweight 140 are lifted and lowered in the hoistway 110 by driving the hoisting machine 100. Hereinafter, the direction in which the elevator car 120 and the counterweight 140 move up and down is referred to as the up-down direction Z.

The elevator car 120 is slidably supported by two guide rails 201A, 201B via a guide device not shown. Similarly, the counterweight 140 is slidably supported by the counterweight-side guide rail 201C via a guide device not shown. The two rails 201A, 201B and the counterweight-side rail 201C extend along the lifting direction Z within the lifting passage 110.

The elevator car 120 is provided with an emergency stop device 5 for emergency stopping the lifting movement of the elevator car 120. The detailed structure of the emergency stop device 5 will be described later.

The machine chamber 160 is provided with a control unit 170. The control unit 170 is connected to the elevator car 120 via a connection wire not shown. The control unit 170 outputs a control signal to the elevator car 120. The control unit 170 is provided in the hoistway 110, and is connected to a state detection sensor, not shown, that detects the state of the elevator car 120.

The information detected by the state detection sensor is information on the position of the elevator car 120, information on the speed of the elevator car 120, information on the acceleration of the elevator car 120, or the like, which is moved up and down in the hoistway 110. As the positional information of the cars 120, for example, in a multi-car elevator in which a plurality of the cars 120 move up and down in the same hoistway 110, abnormal approach information is detected when the intervals between two vertically adjacent cars 120 approach a predetermined interval.

The speed information of the car 120 is, for example, abnormal descent speed information detected when the descent speed of the elevator car 120 exceeds a rated speed and reaches a predetermined speed. The acceleration information of the elevator car 120 is, for example, abnormal acceleration information detected when the acceleration of the elevator car 120 deviates from a predetermined pattern. The state detection sensor outputs the detected information to the control device.

The control unit 170 determines whether the state of the elevator car 120 is abnormal or normal based on the information detected by the state detection sensor. When it is determined that the state of the elevator car 120 is abnormal, the control unit 170 outputs an operation command signal to the emergency stop device 5. Thereby, the emergency stop device 5 operates based on the operation command signal from the control unit 170 to stop the elevator car 120.

In this example, the state detection sensor has been described as detecting position information, velocity information, and acceleration information, but the present invention is not limited to this. For example, the position information, the velocity information, and the acceleration information may be detected by different sensors. The control unit 170 may select and acquire position information, velocity information, and acceleration information individually, or may acquire a plurality of pieces of information in combination.

The control unit 170 and the elevator car 120 are not limited to the example of wired connection, and may be connected wirelessly so as to be able to transmit and receive signals.

Hereinafter, the direction in which the elevator car 120 moves up and down is referred to as the up-down direction Z, the up-down direction Z is orthogonal, and the direction in which the elevator car 120 faces the guide rail 201A is referred to as the first direction X. The direction orthogonal to the first direction X and also orthogonal to the lifting direction Z is referred to as a second direction Y.

1-2 Structure of Emergency stop device

Next, the detailed structure of the emergency stop device 5 will be described with reference to fig. 2 to 6.

Fig. 2 is a front view showing the emergency stop device 5.

As shown in fig. 2, the emergency stop device 5 includes two brake mechanisms 10A and 10B, an operating mechanism 11, a driving mechanism 12 for operating the brake mechanisms 10A and 10B, a first pulling member 13, and a second pulling member 14. The operating mechanism 11 is disposed in a crosshead 121 provided at an upper portion of the elevator car 120.

[ drive mechanism ]

The drive mechanism 12 has a drive shaft 15, a first link member 16, a second link member 17, a first working shaft 18, a second working shaft 19, and a drive spring 20.

The first and second operating shafts 18 and 19 are provided in a crosshead 121 provided at an upper portion of the elevator car 120. The first working shaft 18 is provided at one end portion of the crosshead 121 in the first direction X, and the second working shaft 19 is provided at the other end portion of the crosshead 121 in the first direction X. The first link member 16 is rotatably supported by the first working shaft 18, and the second link member 17 is rotatably supported by the second working shaft 19.

The first link member 16 and the second link member 17 are formed in a substantially T-shape. The first link member 16 has a working piece 16a and a connecting piece 16b. The working piece 16a protrudes substantially perpendicularly from the connecting piece 16b. The working piece 16a is connected to a position on the one end side of the middle portion in the longitudinal direction of the connecting piece 16b. The working piece 16a protrudes toward a guide rail 201A disposed on the negative side (referred to as the left side in the figure) in the first direction X of the elevator car 120, and hereinafter, the left side of the paper surface and the lower side of the paper surface on the XYZ axes in the figure are negative sides, and the right side of the paper surface on the XYZ axes and the upper side of the paper surface are positive sides. The first pulling member 13 is connected to an end portion of the working piece 16a on the opposite side from the connecting piece 16b via a connecting portion 26. The detailed structure of the connection portion 26 will be described later.

The first link member 16 is rotatably supported by the first working shaft 18 at a portion where the working piece 16a and the connecting piece 16b are connected. The drive shaft 15 is connected to one end portion of the connecting piece 16b in the longitudinal direction via a connecting portion 25. A connecting member 41 (see fig. 3) of the working mechanism 11, which will be described later, is connected to the other end portion of the connecting piece 16b in the longitudinal direction, which is the end portion opposite to the end portion connected to the drive shaft 15.

The first link member 16 is disposed such that one end portion in the longitudinal direction of the connecting piece 16b is directed upward in the lowering direction Z, and the other end portion in the longitudinal direction of the connecting piece 16b is directed downward in the raising and lowering direction Z.

The second link member 17 has a working piece 17a and a connecting piece 17b. The working piece 17a protrudes substantially perpendicularly from the connecting piece 17b. The work piece 17a is connected to a longitudinal middle portion of the connection piece 17b. The working piece 17a protrudes toward the guide rail 201B disposed on the positive side in the first direction X of the elevator car 120. The second pulling member 14 is connected to the end of the working piece 17a opposite to the connecting piece 17b via the connecting portion 28.

The drive shaft 15 is connected to the other end portion of the connecting piece 17b in the longitudinal direction via a connecting portion 27. The second link member 17 is rotatably supported by the second working shaft 19 at a connection portion between the working piece 17a and the connecting piece 17b. The second link member 17 is disposed such that one end portion in the longitudinal direction of the connecting piece 17b is directed upward in the lifting direction Z and the other end portion in the longitudinal direction of the connecting piece 17b is directed downward in the lifting direction Z.

One end portion in the first direction X of the drive shaft 15 is connected to the connecting piece 16b of the first link member 16, and the other end portion in the first direction X of the drive shaft 15 is connected to the connecting piece 17b of the second link member 17. A drive spring 20 is provided in an axial intermediate portion of the drive shaft 15.

The drive spring 20 is constituted by, for example, a compression coil spring. One end of the drive spring 20 is fixed to the crosshead 121 via the fixing portion 21, and the other end of the drive spring 20 is fixed to the drive shaft 15 via the pressing member 22. The drive spring 20 biases the drive shaft 15 to the positive side in the first direction X via the pressing member 22.

When the operating mechanism 11 is operated, the drive shaft 15 is biased by the drive spring 20 to move toward the positive side in the first direction X. As a result, the first link member 16 rotates about the first operating shaft 18 so that the end portion of the operating piece 16a connected to the first pulling member 13 is directed upward in the lifting direction Z. The second link member 17 is pivoted about the second operating shaft 19 such that the end portion of the operating piece 17a connected to the second pulling member 14 is directed upward in the lifting direction Z. As a result, the first pulling member 13 is pulled upward in the lifting direction Z in conjunction with the second pulling member 14.

Further, the first brake mechanism 10A is connected to an end portion of the first pulling member 13 opposite to the end portion connected to the working piece 16 a. A second brake mechanism 10B is connected to an end of the second pulling member 14 opposite to the end connected to the working piece 17 a. The first pulling member 13 pulls a pair of stoppers 31 and 31 (see fig. 3) of the first brake mechanism 10A described later upward in the lifting direction Z. The second pulling member 14 pulls a pair of stoppers 31 and 31 of the second brake mechanism 10B described later upward in the lifting direction Z.

The first brake mechanism 10A and the second brake mechanism 10B are disposed at the lower end portion of the elevator car 120 in the lifting direction Z. The first brake mechanism 10A is disposed opposite to the guide rail 201A at one end of the elevator car 120 in the first direction X. The second brake mechanism 10B is disposed opposite to the guide rail 201B at the other end portion of the elevator car 120 in the first direction X.

Next, the detailed structures of the first brake mechanism 10A and the second brake mechanism 10B, and the connection portions 26 and 28 will be described with reference to fig. 3A and 3B.

Fig. 3A and 3B are diagrams showing the brake mechanisms 10A and 10B and the connection portion 26.

Since the first brake mechanism 10A and the second brake mechanism 10B have the same structure, the first brake mechanism 10A will be described herein. The first brake mechanism 10A is simply referred to as a brake mechanism 10.

As shown in fig. 3A, the connection portion 26 is formed in a cylindrical shape. The upper end of the first pulling member 13 in the lifting direction Z is inserted into the cylindrical hole of the connecting portion 26 so as to be movable in the lifting direction Z. The connecting portion 26 is formed with a shaft portion 26a that rotatably supports the work piece 16 a. A stopper 26b is provided at the upper end of the first pulling member 13. The stopper 26b is disposed on the upper end side of the connecting portion 26 in the lifting direction Z in the first pulling member 13. By abutting against the connection portion 26, the first pulling member 13 is prevented from coming out of the connection portion 26.

In this example, the connecting portion 26 is formed in a tubular shape, but the present invention is not limited thereto. The connection portion 26 may be formed in various shapes other than a cylindrical shape as long as it has a hole through which the first pulling member 13 is movably inserted.

When the first link member 16 rotates and the connecting piece 16b rotates upward in the lifting direction Z, the connecting portion 26 abuts against the stopper 26b. The connection portion 26 transmits the rotational torque of the first link member 16 to the first pulling member 13 via the stopper 26b. Thereby, the first pulling member 13 is pulled upward in the lifting direction Z together with the connecting portion 26.

When the first link member 16 rotates and the connecting piece 16b rotates downward in the lifting direction Z, the connecting portion 26 moves downward in the lifting direction Z together with the connecting piece 16b. In the first pulling member 13, a stopper is not provided at a position below the connecting portion 26 in the lifting direction Z. Therefore, the load when the connecting portion 26 moves downward in the lifting direction Z is not transmitted to the first pulling member 13. That is, the connection portion 26 transmits only the force upward in the lifting direction Z from among the driving forces of the driving mechanism 12 to the first pulling member 13. As a result, only the connecting portion 26 moves downward in the lifting direction Z along the first pulling member 13.

The connection portion 28 has the same structure as the connection portion 26, and therefore, the description thereof is omitted.

As shown in fig. 3A and 3B, the brake mechanism 10 includes a housing 30, a pair of stoppers 31, a pair of guide members 32, a connecting member 33, and a biasing member 34. The pair of stoppers 31 are disposed so as to face each other with the guide rail 201A interposed therebetween. In a state before the emergency stop device 5 is operated, a predetermined interval is formed between the pair of stoppers 31 and the guide rail 201A.

The surface of the stopper 31 facing the guide rail 201A is formed parallel to the surface of the guide rail 201A, that is, parallel to the lifting direction Z. The other surface of the stopper 31 opposite to the surface facing the guide rail 201A is inclined so as to approach the guide rail 201A from the lower side to the upper side in the lifting direction Z. Thus, the stopper 31 is formed in a wedge shape.

The pair of stoppers 31, 31 are attached to the lower end portion of the connecting member 33 in the lifting direction Z via a support bolt 36. The support bolt 36 penetrates a through hole 33a provided in the lower end portion of the connecting member 33. The pair of stoppers 31 and 31 are supported by the coupling member 33 via the support bolt 36 so as to be movable in the direction of approaching and separating from the guide rail 201A.

As shown in fig. 3B, the first pulling member 13 is connected to the connecting member 33. Then, the first pulling member 13 is pulled upward in the lifting direction Z, and the pair of stoppers 31, 31 and the connecting member 33 move upward in the lifting direction Z. The pair of stoppers 31 and 31 are disposed so as to be movable in the lifting direction Z by the length of the support bolt 36 with respect to the coupling member 33.

The pair of stoppers 31 and 31 are supported movably by the pair of guide members 32 and 32. The pair of guide members 32, 32 are fixed to the elevator car 120 via the frame 30 (see fig. 2). The pair of guide members 32, 32 are opposed to each other with a predetermined gap therebetween so as to sandwich the guide rail 201A and the pair of stoppers 31, 31.

One surface of the guide member 32 facing the stopper 31 is inclined so as to approach the guide rail 201A as going upward in the lifting direction Z. Therefore, the interval between the surfaces of the pair of guide members 32, 32 facing the stopper 31 becomes narrower as going upward in the lifting direction Z.

Further, a biasing member 34 is disposed on the other surface of the guide member 32 opposite to the surface facing the stopper 31. The urging member 34 is constituted by, for example, a leaf spring having a U-shaped cross section cut in a horizontal direction orthogonal to the lifting direction Z. The two ends of the urging member 34 are opposed to each other with a predetermined gap therebetween so as to sandwich the guide rail 201A. The guide members 32 are fixed to the opposite surfaces of the urging member 34.

The biasing member 34 is not limited to a U-shaped leaf spring, and for example, a compression coil spring may be used so as to be interposed between the guide member 32 and a housing not shown.

When the pair of stoppers 31 and 31 move upward in the lifting direction Z relative to the guide member 32, the pair of stoppers 31 and 31 move in a direction approaching each other through the guide member 32, that is, in a direction approaching the guide rail 201A. When the pair of stoppers 31 move upward in the lifting direction Z, the pair of stoppers 31 are pressed against the guide rail 201A by the urging force of the urging member 34 via the guide member 32. Thereby, the lifting movement of the elevator car 120 is braked.

[ working mechanism ]

Next, the operation mechanism 11 will be described with reference to fig. 4.

Fig. 4 is a front view showing the working mechanism 11. Fig. 4 shows a standby state of the operating mechanism 11.

As shown in fig. 3 and 4, the operating mechanism 11 includes a connecting member 41, an electromagnetic iron core 43, a movable iron core 44, a base plate 45, a feed screw shaft 47, a feed nut 48, and a drive motor not shown. The operating mechanism 11 operates the driving mechanism 12.

The base plate 45 is formed of a flat plate-like member. The base plate 45 is fixed to the crosshead 121. The portion where the base plate 45 is fixed is not limited to the crosshead 121, and is not particularly limited as long as it is an elevator car 120 as a lifting body. A first shaft support portion 54 and a second shaft support portion 55 are fixed to an upper surface portion 45a above the lifting direction Z of the base plate 45.

The first shaft support portion 54 is disposed at one end of the base plate 45, and the second shaft support portion 55 is disposed at the other end of the base plate 45. The first shaft support portion 54 and the second shaft support portion 55 are disposed so as to face each other. The feed screw shaft 47 is rotatably supported by the first shaft support portion 54 and the second shaft support portion 55. The feed screw shaft 47 is disposed between the first shaft support portion 54 and the second shaft support portion 55, and its axial direction is parallel to the first direction X. A drive motor, not shown, is disposed on one of the first shaft support portion 54 and the second shaft support portion 55. The rotary shaft of the drive motor is attached to the feed screw shaft 47 via a coupling.

A trapezoidal thread is formed on the outer peripheral surface of the feed screw shaft 47. The feed nut 48 is screwed to the feed screw shaft 47. An electromagnetic core 43 is fixed to the feed nut 48.

The electromagnetic core 43 is provided with a coil. When power is supplied to the coil from a power source not shown, the coil is energized, and the electromagnet is constituted by the electromagnet core 43 and the coil. The end of the electromagnet core 43 opposite to the end fixed to the feed nut 48 faces the first direction X. The electromagnet core 43 is opposed to a movable core 44 attached to a connecting member 41 described later.

The driving motor is controlled to be driven by the control section 170. When the drive motor rotates, the feed screw shaft rotates. Then, by the rotation of the feed screw shaft 47, the rotational force of the feed screw shaft 47 is converted into a force along the first direction X by the screw portion and the screw hole. And, the feed nut 48 moves along the first direction X. In addition, the electromagnetic core 43 to which the feed nut 48 is fixed also moves in the first direction X.

When the drive motor rotates in the forward direction (normal rotation), the feed nut 48 moves toward the first shaft support portion 54, which is one end portion in the first direction X. When the drive motor rotates in the reverse direction (reverse rotation), the feed nut 48 moves toward the second shaft support portion 55, which is the other end portion in the first direction X. Here, the second shaft support portion 55 is disposed at the standby position of the feed nut 48 and the electromagnetic core 43. Then, when the operating mechanism 11 is in the standby state and returns from the braking state to the return state, the electromagnetic core 43 is in contact with the second shaft support portion 55 via the feed nut 48.

The connection member 41 is rotatably coupled to the connection piece 16b of the first link member 16 via a connection pin 41 a. The movable core 44 is fixed to the connecting member 41. The movable core 44 is supported by the connecting member 41 and faces the electromagnetic core 43 fixed to the feed nut 48. In the standby state shown in fig. 4, the movable core 44 is attracted to the electromagnet core 43.

Further, a drive motor, a feed screw shaft 47, and a feed nut 48 constitute a moving mechanism for moving the electromagnetic core 43 in a direction (in this example, the first direction X) for approaching and separating the electromagnetic core 44.

The connection member 41, the electromagnetic core 43, the movable core 44, the base plate 45, the drive motor, the feed screw shaft 47, and the feed nut 48 constituting the above-described working mechanism 11 are housed in a housing, not shown. In this way, the connecting member 41, the electromagnetic iron core 43 constituting the holding portion, the feed screw shaft 47 constituting the moving mechanism, and the drive motor are housed in one housing, whereby the emergency stop device 5 can be prevented from becoming large. Further, by focusing the functions of the work mechanism 11 in one location, maintenance work can be easily performed.

As described above, the drive spring 20 is disposed at a position different from the operating mechanism 11, and the drive spring 20 is connected to the operating mechanism 11 via the first link member 16 as a link mechanism. Thereby, the working mechanism 11 can be miniaturized.

2. Example of operation of Emergency stop device

Next, an operation example of the emergency stop device 5 having the above-described configuration will be described.

[ Standby State ]

First, the standby state of the emergency stop device 5 will be described with reference to fig. 4.

As shown in fig. 4, in the standby state of the emergency stop device 5, the electromagnetic core 43 is disposed on the other end side of the feed screw shaft 47 in the first direction X. The coil of the electromagnetic core 43 is energized, and the electromagnetic core 43 is excited. Thus, the electromagnet is constituted by the electromagnet core 43 and the coil.

The movable core 44 is attracted to the electromagnetic core 43. Therefore, one end of the connecting piece 16b of the first link member 16 is held toward the positive side in the first direction X via the connecting member 41 to which the movable core 44 is fixed. As a result, the drive shaft 15 connected to the other end portion of the connecting piece 16b is biased to the negative side in the first direction X against the biasing force of the drive spring 20.

At this time, the feed nut 48 is in contact with the second shaft supporting portion 55. As described above, the second shaft support portion 55 is disposed at the standby position of the movable member. Therefore, the position where the feed nut 48 contacts the second shaft support portion 55 is set to the standby state of the emergency stop device 5. The interval between the brake 31 and the guide rails 201A, 201B of the brake mechanisms 10A, 10B coupled to the movable core 44 is adjusted to a desired interval.

This makes it possible to easily position the electromagnetic core 43, the movable core 44, and the feed nut 48 as the movable members. Further, the movement of the movable member in the other end side in the first direction X, that is, the positive side is restricted by the abutment of the feed nut 48 with the second shaft supporting portion 55. This can prevent the gap between the stopper 31 and the guide rails 201A and 201B from being shifted.

Further, since the position of the feed nut 48 can be restricted without using a switch for detecting the position of the feed nut 48, the number of components of the emergency stop device 5 can be reduced, and the operation for adjusting the position of the switch is not required.

Although the example of detecting the position of the feed nut 48 is described without providing a switch, a switch for detecting the positions of the feed nut 48 and the electromagnetic core 43 may be provided.

[ action to brake State ]

Next, an operation from the standby state to the braking state will be described with reference to fig. 5.

Fig. 5 is a front view showing a state in which the working mechanism 11 is operated.

When the control unit 170 determines that the descending speed of the elevator car 120 exceeds a predetermined speed during the descending movement of the elevator car 120 (see fig. 1 and 2), the control unit 170 outputs an operation command signal to the emergency stop device 5. Thereby, the energization to the electromagnetic core 43 is cut off. The interruption of the energization to the electromagnetic iron core 43 occurs not only when the speed of the elevator car 120 is exceeded but also when the power of the elevator 1 is cut.

The energization to the electromagnetic core 43 is cut off, and the magnetism of the electromagnetic core 43 is cancelled. As a result, as shown in fig. 5, the drive shaft 15 is moved to the positive side in the first direction X by the urging force of the drive spring 20, and the one end portion of the first link member 16 is also moved to the positive side in the first direction X together with the drive shaft 15. As a result, the first link member 16 rotates about the first working shaft 18, and the second link member 17 rotates about the second working shaft 19. In this way, the driving mechanism 12 is operated by the operating mechanism 11.

In addition, as shown in fig. 5, the first link member 16 rotates, so that the movable core 44 is separated from the electromagnetic core 43. The connecting member 41 moves to the negative side in the first direction X with the rotation of the first link member 16.

When the first link member 16 rotates and the work piece 16a moves upward in the lifting direction Z, the connection portion 26 moves upward in the lifting direction Z together with the work piece 16 a. The connecting portion 26 is in contact with the stopper 26b, and the stopper 26b is pressed upward in the lifting direction Z by the connecting portion 26. Thereby, the first pulling member 13 is pulled upward in the lifting direction Z. The operations of the second link member 17, the second pulling member 14, and the connecting portion 28 are similar to those of the first link member 16, the first pulling member 13, and the connecting portion 26, and therefore, the description thereof is omitted.

The first and second pulling members 13 and 14 are pulled upward in the lifting direction Z, and the first brake mechanism 10A connected to the first pulling member 13 and the second brake mechanism 10B connected to the second pulling member 14 (see fig. 2) operate. As a result, the pair of stoppers 31 (see fig. 3) of the first brake mechanism 10A and the second brake mechanism 10B move upward in the lifting direction Z, and the pair of stoppers 31 of the second brake mechanism 10B coupled to the second pulling member 14 sandwich the guide rails 201A and 201B, so that the lifting movement of the elevator car 120 is mechanically stopped.

Further, the movable core 44 is separated from the electromagnetic core 43, and the connecting member 41 can be moved without being affected by the friction force and the holding force of the feed screw shaft 47 and the feed nut 48 as the moving mechanism.

[ recovery action ]

Next, a return operation of the emergency stop device 5 from the braking state to the standby state will be described with reference to fig. 6 and 7.

Fig. 6 is an explanatory diagram showing the recovery operation of the operating mechanism 11 and the brake mechanism 10. Fig. 7 is a flowchart showing a recovery action.

As shown in fig. 7, in the standby state, when the power supply to the coil of the electromagnetic core 43 is cut off or lost (step S11), the operating mechanism 11 operates as shown in fig. 5 described above.

The control unit 170 determines whether or not the elevator car 10 is stopped by the brake mechanisms 10A and 10B (step S12). In the process of step S12, not only the stopped state of the elevator car 10 but also the state of the emergency stop device 5 may be comprehensively determined based on information such as whether or not the operating mechanism 11 is operated.

In the process of step S12, when it is determined that the elevator car 10 is stopped (yes in step S12), the control unit 170 performs a recovery operation of the operating mechanism 11 as a trigger (step S13), which will be described later.

In the return operation shown in step S13, first, the control unit 170 controls the power supply to energize the coil of the electromagnetic core 43. Thereby, the coil is energized, and the electromagnetic core 43 is excited. Then, the control unit 170 rotates the feed screw shaft 47 by driving the drive motor 46. The feed screw shaft 47 rotates, so that the rotational force of the feed screw shaft 47 is converted into a force along the first direction X by the screw portions and the screw holes of the feed screw shaft 47 and the feed nut 48. The feed nut 48 moves toward the negative side of the first direction X. The electromagnetic core 43 fixed to the feed nut 48 also moves toward the movable core 44, i.e., toward the negative side in the first direction X.

Next, when the electromagnet core 43 contacts the movable core 44, the movable core 44 is attracted to the electromagnet core 43. Then, the control unit 170 rotates the feed screw shaft 47 by driving the drive motor 46. Thereby, the feed nut 48 screwed with the feed screw shaft 47 moves toward the positive side in the first direction X. Therefore, the electromagnetic core 43, the movable core 44 attached to the electromagnetic core 43, and the connecting member 41 move toward the positive side in the first direction X.

The connecting member 41 moves to the positive side in the first direction X, so that the first link member 16 rotates against the urging force of the drive spring 20. When the feed nut 48 abuts against the second shaft support portion 55, the movement of the feed nut 48 and the electromagnetic core 43 in the positive side in the first direction X is restricted. This makes it possible to easily position the electromagnetic core 43, the movable core 44, and the feed nut 48 as the movable members.

Further, the first link member 16 rotates, so that the connection piece 16b rotates downward in the lifting direction Z, and the connection portion 26 moves downward in the lifting direction Z together with the connection piece 16b. As described above, the connecting portion 26 and the first pulling member 13 are transmitted only to the force upward in the lifting direction Z. Therefore, only the connecting portion 26 moves downward in the lifting direction Z along the first pulling member 13. Therefore, the force of the stopper 31 of the brake mechanism 10 sandwiching the rail 201A does not act on the operating mechanism 11 and the first link member 16. Thus, the driving force of the driving motor (driving unit) provided in the operating mechanism 11 is only required to be a force against the urging force of the driving spring 20 of the driving mechanism 12. The drive motor (drive unit) of the operating mechanism 11 can be miniaturized.

The connecting portion 26 moves downward in the lifting direction Z, and releases the upward biasing force in the lifting direction Z generated by the drive spring 20 to the first pulling member 13 and the connecting member 33 of the brake mechanism 10. Therefore, the first pulling member 13 and the connecting member 33 descend downward in the lifting direction Z due to their own weight. The support bolt 36 attached to the stopper 31 is inserted through the through hole 33a provided at the lower end portion of the coupling member 33, and therefore the coupling member 33 can be prevented from falling off.

Further, the load in the upward and downward direction Z with respect to the coupling member 33 is released, and the load in the upward and downward direction Z from the driving mechanism 12 with respect to the brake 31 is also released. As a result, the force of the stopper 31 to clamp the rail 201A also decreases.

As shown in fig. 6, when the return operation of the operating mechanism 11 is completed, the control unit 170 drives the hoisting machine 100 to raise (UP) the elevator car 120 (step S14). Thereby, the frame 30 of the brake mechanism 10 also rises together with the elevator car 120, and the brake 31 is pulled down relatively. Thereby, the clamping of the rail 201A by the stopper 31 is released. Then, by performing the above-described steps, the recovery operation of the emergency stop device 5 is completed.

In the restoration operation of this example, the elevator car 120 is lifted from the completion of the restoration operation of the operating mechanism 11, and the operation of the operating mechanism 11 and the operation of the elevator car 120 are separately performed. This makes it possible to reliably perform the recovery operation of the emergency stop device 5 in the elevator 1, and to simplify the control of the recovery operation.

The present invention is not limited to the embodiments described above and shown in the drawings, and various modifications can be made without departing from the gist of the invention described in the claims.

In the above embodiment, the control of the operating mechanism 11 and the control of the entire elevator 1 by the control unit 170 have been described as examples, but the present invention is not limited thereto. For example, the control of the operating mechanism 11 and the control of the entire elevator 1 may be performed by different control units.

The example in which the drive motor 46, the feed screw shaft 47, and the feed nut 48 are used as the moving mechanism has been described, but the present invention is not limited thereto. As the moving mechanism for moving the electromagnetic core 43, for example, various other moving mechanisms such as a mechanism using a belt drive, a gear drive, a chain drive, and a direct-acting solenoid can be applied.

The example in which the direction in which the electromagnet core of the operating mechanism 11 moves is set to be substantially parallel to the first direction X has been described, but the present invention is not limited thereto. The moving direction of the electromagnetic core of the operating mechanism 11 may be set to be substantially parallel to the lifting direction Z and the second direction Y, or may be a direction inclined with respect to the first direction X, the second direction Y, and the lifting direction Z. The first link member 16 and the second link member 17 may be disposed at both ends in the second direction Y of the elevator car 120, and the drive shaft 15 may be disposed along the second direction Y.

The elevator body is not limited to the elevator car 120, and the counterweight 140 may be applied. The emergency stop device may be provided to the counterweight 140 to emergency stop the lifting movement of the counterweight 140. In this case, an operating mechanism, a driving mechanism, and the like, which constitute the emergency stop device, are disposed in the counterweight 140.

In the above embodiment, the control unit 170 for controlling the entire elevator 1 was described as the control unit for controlling the emergency stop device, but the present invention is not limited thereto. As the control unit, other various control units such as a control unit provided in the elevator car 120 and controlling only the elevator car 120, a control unit controlling only the emergency stop device, and the like can be applied.

The present invention is also applicable to a multi-car elevator in which a plurality of elevator cars are moved up and down in one hoistway.

In the present specification, terms such as "parallel" and "orthogonal" are used, but these terms are not limited to the strict terms such as "parallel" and "orthogonal", and may include terms such as "parallel" and "orthogonal" and "substantially parallel" and "substantially orthogonal" in a range where the functions thereof can be exhibited.

Reference numerals illustrate:

an elevator of 1 …,5 … emergency stop device, 10A, 10B … first brake mechanism, 11B … working mechanism, 12 … driving mechanism, 13, 14 … lifting member, 15 … drive shaft, 16 … first link member, 17 … second link member, 16a, 17B … working piece, 16B, 17B … connecting piece, 18 … first working shaft, 19 … second working shaft, 20 … drive spring, 26, 28 … connecting portion, 26a … shaft portion, 26B … stopper, 41 … connecting member, 43 … electromagnetic core, 44 … movable core, 45 … base plate, 46 … drive motor, 46a … rotation shaft, 47 … feed screw shaft, 48 … feed nut, 54 … first shaft support portion, 55 … second shaft support portion, 100 … hoist, 110 … lifting channel, 120 … elevator car (lifting body), 121 … cross head, 130, … main suspension wire (lifting body) …, 150B … lifting machine guide rail 201, and guide rail 201B, and guide rail 201, and a guide rail portion … lifting/or a, and a guide rail portion.

Claims

1. An emergency stop device, wherein,

the emergency stop device is provided with:

a brake mechanism having a brake member provided on a lifting body and sandwiching a rail for sliding the lifting body, the brake mechanism stopping movement of the lifting body;

a pulling member connected with the brake;

a driving mechanism having a connection portion connected to the pulling member and operating the braking mechanism; and

a working mechanism which is connected with the driving mechanism and enables the driving mechanism to work,

the connecting portion transmits only a force upward in the lifting direction with respect to the pulling member.

2. The emergency stop device according to claim 1, wherein,

the brake mechanism includes a coupling member that supports the brake so as to be movable in a direction of being clamped to the guide rail,

the pulling member is connected with the connecting member.

3. The emergency stop device according to claim 1, wherein,

the connecting portion is formed with a hole through which the pulling member is movably inserted in the lifting direction.

4. The emergency stop device according to claim 3, wherein,

a stopper abutting against the connecting portion is provided at a position above the connecting portion in the lifting direction in the pulling member.

5. The emergency stop device according to claim 4, wherein,

the driving mechanism includes:

a link member rotatably supported by a working shaft provided to the lifting body and connected to the connecting portion; and

a drive spring for applying force to the end part of the connecting rod component connected with the connecting part towards the upper part of the lifting direction,

the connecting portion has a shaft portion rotatably supporting an end portion to which the link member is connected.

6. The emergency stop device according to claim 5, wherein,

the working mechanism comprises:

a connecting member connected with the link member;

a movable core fixed to the connection member;

an electromagnetic core that detachably attracts the movable core; and

a moving mechanism that supports the electromagnetic core so as to be movable in a direction of approaching and separating the electromagnetic core from the movable core,

the moving mechanism has a driving unit for moving the electromagnetic core.

7. An elevator comprising a lifting body which moves up and down in a lifting channel, wherein,

the elevator is provided with:

a guide rail which is vertically provided in the lifting path and supports the lifting body so as to be slidable; and

an emergency stop device for stopping the movement of the lifting body based on the state of the lifting movement of the lifting body,

the emergency stop device is provided with:

a brake mechanism having a brake member provided to the lifting body and sandwiching a rail for sliding the lifting body, the brake mechanism stopping movement of the lifting body;

a pulling member connected with the brake;

8. A method of recovering an emergency stop device, the emergency stop device comprising: a brake mechanism having a brake member provided on a lifting body and sandwiching a rail for sliding the lifting body, the brake mechanism stopping movement of the lifting body; a pulling member connected with the brake; a driving mechanism having a connection portion connected to the pulling member and operating the braking mechanism; and an operating mechanism connected to the driving mechanism and operating the driving mechanism, wherein the connecting portion transmits only a force upward in the lifting direction with respect to the lifting member,

the recovery method of the emergency stop device comprises the following steps:

performing a restoring operation of the operating mechanism to release a load from the driving mechanism to an upper side of the brake in a lifting direction; and

when the restoration operation of the operating mechanism is completed, the lifting body is lifted and operated, and the clamping of the guide rail by the brake is released.