CN115703607A

CN115703607A - Braking system of multi-car intelligent parallel elevator

Info

Publication number: CN115703607A
Application number: CN202110883478.3A
Authority: CN
Inventors: 周立波; 朱建伟; 毛凯萍; 刘翔; 谭慧
Original assignee: Hunan Daju Information Technology Co ltd
Current assignee: Hunan Daju Information Technology Co ltd
Priority date: 2021-08-03
Filing date: 2021-08-03
Publication date: 2023-02-17

Abstract

The invention provides a braking system of a multi-car intelligent parallel elevator, which is free of a traction structure and comprises a plurality of cars, at least two tracks and a plurality of switching tracks, wherein the switching tracks are used for connecting two different tracks, the cars and a driving device are arranged on a suspension device, the driving device drives the suspension device and the cars to run along the tracks, the braking system comprises a working brake and an additional brake, the working brake is used for braking the driving device, and the additional brake realizes braking of the cars by clamping the tracks. The invention reduces the braking torque when the working brake acts, reduces the braking friction force of the driving tire, reduces the pressure born by the tire, prolongs the service life of the tire, simplifies the structure of the driving device and lightens the weight of the driving device.

Description

Braking system of multi-car intelligent parallel elevator

Technical Field

The invention belongs to the technical field of elevators, and particularly relates to a braking system of a multi-car intelligent parallel elevator.

Background

Elevators have become an indispensable manned or cargo vertical transport vehicle in modern society and economic activities. Since 1854 the invention of elevators, elevator cars have been operated by wire rope sheave traction drive, and machine rooms, traction motors and reduction gears have been installed on the top of buildings to drive wire ropes to pull the cars and counterweights to operate on rails in the hoistway. The driving mode enables only one elevator car to normally run in a single shaft, and the elevator in the single-elevator-car running mode can meet the use requirement on low-rise buildings and floors with small passenger flow. With the rapid development of modern cities, high-rise buildings and super high-rise buildings with large population density are pulled out, the defects of long elevator waiting time and low conveying efficiency of the elevator in a single-car operation mode are continuously enlarged, and the traditional single-car elevator operation mode is difficult to adapt to the rapid development requirements of modern city buildings.

In order to improve the building space utilization rate and the elevator conveying efficiency and reduce the construction cost of the building and the elevator, a multi-car parallel elevator is being developed and applied along with the continuous development of the engineering technology level. The multi-car parallel elevator adopts the direct drive technology without the traction steel wire rope, so that a plurality of elevator cars can be operated simultaneously in the same shaft, and the elevators among the shafts can be switched to operate in the shafts, so as to realize the overrunning operation.

The car of the parallel elevator of many cars intelligence compresses tightly the track through the drive tire, and drive arrangement drives the drive wheel and rotates to produce the friction drive power, drive the operation of elevator. In order to ensure reliable braking force for the elevator, it is often necessary to use redundant braking force designs. For a direct-drive multi-car intelligent parallel elevator, the brake is easy to cause the output torque of the brake to be large, the weight to be heavy and the occupied space to be large; alternatively, the output torque of the brake can be reduced, but the braking force of the tire cannot be reduced, and at this time, the tire needs to bear the pressure load caused by redundant braking force, so that the tire is pressed greatly and is easy to wear, and meanwhile, the force application mechanism of the driving device also needs larger clamping force, which is not favorable for the design of light weight and miniaturization.

Disclosure of Invention

Aiming at the problems in the prior art, the invention aims to provide a braking system of a multi-car intelligent parallel elevator, which reduces the braking torque when a working brake acts, reduces the braking friction force of a driving tire, reduces the pressure born by the tire, prolongs the service life of the tire, simplifies the structure of a driving device and lightens the weight of the driving device.

In order to achieve the purpose, the invention adopts the technical scheme that:

the utility model provides a braking system of parallel elevator of many cars intelligence, elevator system does not have traction structure, the elevator includes a plurality of cars, two at least tracks and switches the track, it is equipped with a plurality ofly to switch the track, it is used for linking up two different tracks to switch the track, and car and drive arrangement install on suspension device, and drive arrangement drives suspension device and car and moves along the track, braking system includes service brake and additional brake, and service brake is used for braking drive arrangement's action, and the additional brake realizes braking the car through pressing from both sides tight track.

As a further improvement of the above technical solution:

the brake system further comprises an action detection device and a control system, the action detection device is used for detecting the action of the working brake, the additional brake and the action detection device are respectively and electrically connected with the control system, the action detection device sends the detected action information of the working brake to the control system, and the control system controls the action of the working brake and the additional brake.

When the control system sends a working brake action command, but the working brake does not act within the set time and the control system does not receive the signal of the detection device, the control system sends a command to trigger the additional brake to work so as to stop the elevator car.

When the control system sends a working brake action command, the working brake is already actuated, the control system receives a working brake action signal, but the elevator car does not stop within the specified braking time, the control system sends a command to trigger the additional brake to work, and the elevator is braked and stopped.

The working brake is an electromagnetic brake.

The additional brake is mounted on the housing of the drive or on the suspension device.

The additional brake is a caliper disc brake and is driven to act through electromagnetism, hydraulic pressure or pneumatics.

The additional brake is a wedge type brake, the additional brake comprises at least one movable wedge and at least one static wedge, the static wedge is fixedly installed on a shell of the driving device or a suspension device, the movable wedge is located between the static wedge and the track, the movable wedge and the static wedge are both provided with an inclined surface, the inclined surface of the movable wedge is attached to the inclined surface of the static wedge, and the movable wedge can move.

The side of the movable wedge opposite to the inclined plane of the movable wedge is a vertical surface, the vertical surface is a braking surface, the vertical surface is parallel to the track, and when the inclined plane of the movable wedge is kept to be attached to the inclined plane of the static wedge and the movable wedge moves along the length direction of the track, the distance between the vertical surface and the track is increased or decreased.

The additional brake also comprises a lifting piece and a triggering part, one end of the lifting piece is connected with the movable wedge block, the other end of the lifting piece is connected with the triggering part, the triggering part is electrically connected with the control system, the control system sends an instruction to the triggering part, the triggering part can act according to the instruction to drive the lifting piece to act, and the lifting piece drives the movable wedge block to move.

Safety gear is provided in the elevator system, which safety gear and additional brake combine to form a combined safety gear: when the running speed of the elevator car exceeds a set value, the control system is combined with the safety gear to clamp the track, when the control system sends an operating brake action command, but the operating brake does not act within a set time, the control system sends a command to trigger the operation of the safety gear, the track is clamped by the safety gear to brake the elevator car, when the control system sends an operating brake action command, the operating brake already acts, but the elevator car does not stop within a specified braking time, the control system sends a command to trigger the operation of the safety gear, the track is clamped by the safety gear to brake the elevator car.

The safety tongs comprise a first movable wedge block and a first lifting piece, wherein the first lifting piece is connected with the first movable wedge block, when the running speed of the lift car exceeds a set value, the first movable wedge block is pulled by the first lifting piece, the first movable wedge block clamps a track, the combined safety tongs comprise the first movable wedge block, the first lifting piece, the lifting piece and a triggering part, the first lifting piece and the lifting piece are connected with the first movable wedge block in parallel, the other end of the lifting piece is connected with a triggering part, when the running speed of the lift car exceeds the set value, the first movable wedge block is driven by the first lifting piece combined with the safety tongs to act and clamp the track, when the control system sends an operating brake action command, but the operating brake does not act within a set time, the control system sends a command to trigger the combined safety tongs to act, the triggering part triggers the lifting piece, the lifting piece drives the first movable wedge block to act and clamp the track, when the control system sends an operating brake action command, and the operating brake has acted, but the lift car does not stop within a set stopping time, the control system sends a command to trigger the safety tongs to act and trigger the first movable wedge block to act and drive the first movable wedge block to act.

The invention has the beneficial effects that: the braking system comprises the working brake and the additional brake, so that the braking torque when the working brake acts is reduced, the braking friction force for driving the tire is reduced, the pressure born by the tire is reduced, the service life of the tire is prolonged, the structure of the driving device is simplified, and the weight of the driving device is reduced.

Drawings

FIG. 1 is a schematic block diagram of one embodiment of the present invention;

fig. 2 is a schematic view showing the construction of an additional brake according to an embodiment of the present invention.

Detailed Description

The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.

For ease of description, spatially relative terms such as "over 8230," "upper surface," "above," and the like may be used herein to describe the spatial positional relationship of one device or feature to other devices or features as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary terms "at 8230; \8230; 'above" may include both orientations "at 8230; \8230;' above 8230; 'at 8230;' below 8230;" above ". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

The utility model provides a braking system of parallel elevator of many cars intelligence, as shown in fig. 1, elevator system does not have the structure of towing, the elevator includes a plurality of cars 5, at least two tracks 1 and switches the track, it is equipped with a plurality ofly to switch the track, it is used for linking up two different tracks 1 to switch the track, and car 5, drive arrangement 2 and spacing guider 3 all install on suspension device 4.

The driving device 2 is provided with at least one group, the driving device 2 is power for the operation of the car, the driving device 2 drives the suspension device 4 and the car 5 to operate along the track 1, in other words, the driving device 2 drives the car 5 to operate through the suspension device 4, and the car 5 continues to move upwards or downwards after being switched by the switching track in the process of moving upwards or downwards along the track 1. The driving device 2 comprises a driving motor and a driving tire, the driving tire is attached to and tightly presses the track 1, the driving motor drives the driving tire to rotate, and the driving tire drives the suspension device 4 and the car 5 installed on the suspension device 4 to run through friction force between the driving tire and the track 1.

The limiting and guiding device 3 is provided with at least one group, and the limiting and guiding device 3 is used for limiting and guiding the suspension device 4, so that the suspension device 4 can smoothly run along the track 1.

The structure of the driving device 2 and the limit guide 3 can be referred to other patent applications of the applicant, and will not be described repeatedly.

The brake system comprises a working brake 2-1, an additional brake 6, a motion detection device and a control system, wherein the working brake 2-1 and the additional brake 6 are used for braking to stop the car 5.

The service brake 2-1 is used to brake the action of the drive device 2.

The working brake 2-1 is arranged at the power input end of the driving device 2, and the power input end of the driving device 2 refers to a component for generating, transmitting or converting power between a driving motor of the driving device 2 and a driving tire, and comprises a power shaft, a power transmission component or a power conversion component and the like. The working brake 2-1 acts directly on the power shaft, the power transmission component or the conversion component. The power shaft, power transmission part or power conversion part includes, but is not limited to, a motor shaft, a reduction gear, a driving tire, a brake disc for driving a tire, etc., i.e., the service brake 2-1 may directly act on the motor shaft, the reduction gear, the driving tire or the brake disc for driving the tire. Preferably, the working brake 2-1 is arranged at the front section of the speed reducer, namely the speed reducer is close to the motor side, specifically, the working brake 2-1 is connected with the output shaft of the motor or the input shaft of the speed reducer, so that the requirement on the torque of the working brake 2-1 can be reduced, the light design of the working brake 2-1 is realized, the structure is simple and compact, and the cost is low.

In this embodiment, the work brake 2-1 is an electromagnetic brake, and preferably, the work brake 2-1 is a power-off electromagnetic brake.

The action detection device is used for detecting the action of the working brake 2-1, the action detection device is electrically connected with the control system, and the action detection device sends the detected action information of the working brake 2-1 to the control system. When the working brake 2-1 acts, the detection device is linked or triggered, and the detection device is a detection switch and the like.

The additional brake 6 brakes the operation of the car 5 by clamping the rail 1, i.e. the additional brake 6 acts directly on the rail 1.

The additional brake 6 is arranged on the structural part of the elevator, in particular, the additional brake 6 can be mounted on the housing of the drive 2 or on the suspension 4 or on the limit guide 3, the additional brake 6 acting directly on the rail 1.

The additional brake 6 can adopt an existing industrial caliper disc brake, and the additional brake 6 is driven to act through electromagnetism, hydraulic pressure or pneumatics, so that the additional brake 6 clamps the track 1 to generate braking force. Further, the control system controls electromagnetic, hydraulic or pneumatic signals and thus the actuation of the additional brake 6. The technical solutions for controlling the electromagnetic, hydraulic or pneumatic control system are well known to those skilled in the art and will not be described herein.

Preferably, the additional brake 6 can be a wedge type brake, the additional brake 6 comprises a pull-up member 63, a trigger member 64, at least one movable wedge 61 and at least one stationary wedge 62, the stationary wedge 62 is fixedly mounted on the housing of the driving device 2 or on the suspension device 4 or on the limit guide device 3, and the movable wedge 61 is located between the stationary wedge 62 and the rail 1. The movable wedge block 61 and the static wedge block 62 are both wedge-shaped, the movable wedge block 61 and the static wedge block 62 are both provided with an inclined surface, the inclined surface of the movable wedge block 61 is attached to the inclined surface of the static wedge block 62, and the movable wedge block 61 can move.

The side of the movable wedge 61 opposite to the inclined surface thereof is a vertical surface, which is a braking surface and is parallel to the rail 1. When the inclined surface of the movable wedge 61 is kept in contact with the inclined surface of the stationary wedge 62 while the movable wedge 61 is moved in the length direction of the rail 1, the distance between the vertical surface and the rail 1 is increased or decreased.

The movable wedge block 61 is connected with a lifting piece 63, one end of the lifting piece 63 is connected with the movable wedge block 61, the other end of the lifting piece 63 is connected with a trigger component 64, the trigger component 64 is electrically connected with the control system, the control system sends an instruction to the trigger component 64, the trigger component 64 can act according to the instruction to drive the lifting piece 63 to act, the lifting piece 63 drives the movable wedge block 61 to move, the inclined surface of the movable wedge block 61 is kept attached to the inclined surface of the static wedge block 62, and meanwhile the movable wedge block moves along the length direction of the track 1, and the braking surface is close to or far away from the track 1. When the braking surface approaches the rail 1 to contact and press against the rail 1, the movable wedge 61 stops the car 5 by virtue of the friction between the movable wedge and the rail 1. The technical scheme of the triggering part 64 for triggering and driving the additional brake 6 to act can refer to other patent applications of the applicant, and the description is not repeated here.

In this embodiment, the movable wedge 61 is small in top and large in bottom, the stationary wedge 62 is large in top and small in bottom, and the inclined surfaces of the movable wedge 61 and the stationary wedge 62 contact each other along the downward traveling direction of the car 5. The pulling member 63 is a rigid member, one end of the pulling member 63 is connected to the upper surface of the movable wedge 61, and the other end is connected to the triggering member 64, and the triggering member 64 drives the pulling member 63 to move upwards or downwards (as shown by the reverse direction of the double-headed arrow in fig. 2): when the lifting piece 63 moves upwards, the movable wedge 61 moves upwards and moves towards the track 1 at the same time, gradually approaches and clamps the track 1, the vertical surface of the movable wedge 61 is in contact with the track 1 to generate frictional resistance, the resistance is opposite to the gravity and the downward movement direction of the car 5, after the movable wedge 61 is in contact with and presses the track 1, the resistance is increased when the car continues to move upwards until the car 5 stops running, and the effect of stopping the car 5 is achieved. When the movable wedge 61 bears the vertically downward acting force of the pulling piece 63, the movable wedge 61 moves downward and moves away from the track 1, the vertical surface of the movable wedge 61 is separated from the track 1, the braking action of the movable wedge 61 is cancelled, and the normal running state of the lift car 5 is recovered.

The service brake 2-1 is used for braking when the elevator car 5 is in normal operation and in emergency stop. The additional brake 6 is used for operating the additional brake 6 when the working brake 2-1 fails, i.e. the working brake 2-1 is not operated or is operated due to a mechanical failure but the braking force is insufficient and the expected braking effect is not achieved.

The working principle of the invention is as follows: when the control system sends an action command of the working brake 2-1, but the working brake 2-1 does not act, the detection device is not triggered, and the control system does not receive a signal of the detection device within a set time, the working brake 2-1 is considered to be invalid, and at the moment, the control system sends a command to trigger the additional brake 6 to work to brake the elevator car 5. The failure of the service brake 2-1 includes a non-operation due to jamming or damage of an actuator of the service brake 2-1, and the like.

When the control system sends an action command of the working brake 2-1, the working brake 2-1 is already actuated, the detection device is triggered, the control system receives an action signal of the working brake 2-1, but the car 5 does not stop within the specified braking time, the brake is also considered to be failed, in this case, the brake is failed due to the failure caused by the insufficient braking force of the working brake 2-1, and the insufficient braking friction force can be caused by the abrasion of the friction plate of the working brake 2-1, the abrasion of the driving tire and the like, at the moment, the control system sends a command to trigger the additional brake 6 to work, so that the elevator is braked and stopped.

In a conventional embodiment, a safety gear is provided in an elevator system, and the conventional safety gear includes a movable wedge and a lifting member, which are respectively provided as a first movable wedge and a first lifting member, and the first lifting member is connected to the first movable wedge. The working principle of the existing safety tongs is as follows: when the running speed of the car 5 exceeds a set value, the first lifting piece pulls the first movable wedge block, the first movable wedge block clamps the track 1, and the car 5 is stopped.

In this solution, as another embodiment, the additional brake 6 may be integrated with the existing safety gear of the car 5 to form a combined safety gear. The mode of combining the additional brake 6 and the original safety gear of the lift car 5 into one or a combination mode is as follows: a lifting piece 63 is connected to a first movable wedge block of the original safety gear, and the other end of the lifting piece 63 is connected with a trigger part 64. Namely, the movable wedge block of the original safety gear is simultaneously connected with the lifting piece 63 and the first lifting piece, and the lifting piece 63 and the first lifting piece are connected with the first movable wedge block in parallel. The triggering component 64, the pulling component 63 and the first movable wedge form a component of the additional brake 6, and the function of the additional brake 6 is realized; the first lifting piece and the first movable wedge block form parts of the original safety gear, and the function of the original safety gear is realized.

Preferably, in the combined safety gear of this embodiment, the first pulling member and the pulling member 63 are flexible structures such as ropes.

In actual use, the function of the additional brake 6 is realized on the original safety gear, and the actions of the first lifting piece and the lifting piece 63 are not influenced mutually. The working principle of the combined safety gear is as follows: when the running speed of the car 5 exceeds a set value, the first lifting piece drives the first movable wedge block, and the first movable wedge block clamps the track 1. When the control system sends an action instruction of the working brake 2-1, but the working brake 2-1 does not act, the detection device is not triggered, and the control system does not receive a signal of the detection device within a set time, the working brake 2-1 is considered to be failed, at the moment, the control system sends the instruction to trigger and combine with the action of the safety tongs, so that the lifting piece 63 drives the first movable wedge block, the first movable wedge block clamps the track 1 to brake the elevator car 5, and the failure of the working brake 2-1 comprises the conditions of non-action and the like caused by the blocking or damage of an execution part of the working brake 2-1. When the control system sends an operating instruction of the working brake 2-1, the working brake 2-1 is already operated, the detection device is triggered, the control system receives an operating signal of the working brake 2-1, but the car 5 is not stopped within the specified braking time, the brake is also considered to be failed, in this case, the brake is failed due to the fact that the braking force of the working brake 2-1 is insufficient, and the braking friction force is insufficient due to abrasion of a friction plate of the working brake 2-1, abrasion of a driving tire and the like, at the moment, the control system sends an instruction to trigger and combine with the safety tongs to work, so that the lifting piece 63 drives the first movable wedge block, the first movable wedge block clamps the track 1, and the elevator car 5 is braked and stopped.

Finally, it must be said here that: the above embodiments are only used for further detailed description of the technical solutions of the present invention, and should not be understood as limiting the scope of the present invention, and the insubstantial modifications and adaptations made by those skilled in the art according to the above descriptions of the present invention are within the scope of the present invention.

Claims

1. The utility model provides a braking system of parallelly connected elevator of many cars intelligence, elevator system does not have traction structure, the elevator includes a plurality of cars (5), at least two tracks (1) and switches the track, it is equipped with a plurality ofly to switch the track, it is used for linking two different tracks (1) to switch the track, car (5) and drive arrangement (2) are installed on suspension device (4), drive arrangement (2) drive suspension device (4) and car (5) along track (1) operation, characterized in that, braking system includes service brake (2-1) and additional brake (6), service brake (2-1) are used for the action of braking drive arrangement (2), and additional brake (6) realize braking car (5) through pressing from both sides track (1).

2. The braking system of claim 1, wherein: the brake system further comprises an action detection device and a control system, the action detection device is used for detecting the action of the working brake (2-1), the additional brake (6) and the action detection device are respectively and electrically connected with the control system, the action detection device sends the detected action information of the working brake (2-1) to the control system, and the control system controls the action of the working brake (2-1) and the additional brake (6).

3. The braking system of claim 2, wherein: when the control system sends a working brake (2-1) action command, but the working brake (2-1) does not act within a set time and the control system does not receive a signal of the detection device, the control system sends a command to trigger the additional brake (6) to work so as to stop the elevator car (5).

4. The braking system of claim 2, wherein: when the control system sends an operating brake (2-1) action command, the operating brake (2-1) is already actuated, the control system receives an operating brake (2-1) action signal, but the car (5) does not stop within the specified braking time, the control system sends a command to trigger the additional brake (6) to work, and the elevator is braked and stopped.

5. The brake system according to any one of claims 1 to 4, wherein: the additional brake (6) is mounted on the base body of the drive (2) or on the suspension device (4).

6. The brake system according to any one of claims 1 to 4, wherein: the additional brake (6) is a caliper disc brake, and the additional brake (6) is driven to act through electromagnetism, hydraulic pressure or pneumatics.

7. The brake system according to any one of claims 1 to 4, wherein: the additional brake (6) is a wedge type brake, the additional brake (6) comprises at least one movable wedge (61) and at least one static wedge (62), the static wedge (62) is fixedly installed on a shell of the driving device (2) or a suspension device (4), the movable wedge (61) is located between the static wedge (62) and the track (1), the movable wedge (61) and the static wedge (62) are both provided with an inclined surface, the inclined surface of the movable wedge (61) is attached to the inclined surface of the static wedge (62), and the movable wedge (61) can move.

8. The braking system of claim 7, wherein: the additional brake (6) further comprises a lifting piece (63) and a trigger component (64), one end of the lifting piece (63) is connected with the movable wedge block (61), the other end of the lifting piece is connected with the trigger component (64), the trigger component (64) is electrically connected with the control system, the control system sends an instruction to the trigger component (64), the trigger component (64) can act according to the instruction to drive the lifting piece (63) to act, and the lifting piece (63) drives the movable wedge block (61) to move.

9. The brake system according to any one of claims 1 to 4, wherein: safety gear is provided in the elevator system, which safety gear and additional brake (6) combine to form a combined safety gear: when the running speed of the elevator car (5) exceeds a set value, the elevator car is clamped on the track (1) by combining the safety tongs, when the control system sends a working brake (2-1) action command, but the working brake (2-1) does not act within a set time, the control system sends a command to trigger the action of combining the safety tongs, the elevator car (5) is clamped on the track (1) by combining the safety tongs, when the control system sends a working brake (2-1) action command, the working brake (2-1) already acts, but the elevator car (5) does not stop within a specified braking time, the control system sends a command to trigger the operation of combining the safety tongs, the track (1) is clamped by combining the safety tongs, and the elevator car (5) is braked.

10. The braking system of claim 9, wherein: the safety tongs comprise a first movable wedge block and a first lifting piece, wherein the first lifting piece is connected with the first movable wedge block, when the running speed of the lift car (5) exceeds a set value, the first movable wedge block is pulled by the first lifting piece, the first movable wedge block clamps the track (1), the combined safety tongs comprise the first movable wedge block, the first lifting piece, a lifting piece (63) and a triggering part (64), the first lifting piece and the lifting piece (63) are connected with the first movable wedge block in parallel, the other end of the lifting piece (63) is connected with the triggering part (64), when the running speed of the lift car (5) exceeds the set value, the first lifting piece of the safety tongs is combined to drive the first movable wedge block to act to clamp the track (1), and when the control system sends an action command of the working brake (2-1), when the working brake (2-1) does not act within the set time, the control system sends a command to trigger the safety gear to act, the trigger component (64) triggers the lifting piece (63), the lifting piece (63) drives the first movable wedge block to act, the first movable wedge block acts to clamp the track (1), when the control system sends a working brake (2-1) action command and the working brake (2-1) acts but the car (5) does not stop within the specified braking time, the control system sends a command to trigger the safety gear to act, the trigger component (64) triggers the lifting piece (63), the lifting piece (63) drives the first movable wedge block to act, and the first movable wedge block acts to clamp the track (1), and stopping the car (5).