Lifting device and lifting isolation safety system using same

Abstract

The utility model relates to a fixed or movable closing device used at an opening of a building, a vehicle, a fence or a similar surrounding object, in particular to a lifting device and a lifting isolation safety system using the lifting device. The lifting device comprises a fixed column and a lifting column, the lifting column is guided to ascend and descend on the fixed column within a set height range, the lifting column is provided with a driving device, and a self-locking speed reduction device and a bidirectional transmission device are sequentially arranged between the driving device and the lifting column. And a clutch which is closed when the lifting column normally ascends and descends and is separated when the lifting column is abnormal is arranged between the self-locking speed reduction device and the bidirectional transmission device. The lifting device solves the problem that a lifting device of an existing lifting isolation safety system cannot give consideration to accidental descending prevention and forced opening under the emergency condition.

Description

Technical Field

[0001] The utility model relates to a fixed or movable closing device used at the opening of a building, a vehicle, a fence or similar surrounding objects, in particular to a lifting device and a lifting isolation safety system using the lifting device. Background Art

[0002] In order to ensure the efficiency of boarding and alighting, railway platforms are mostly designed in an open style, with platform patrollers patrolling the platform to ensure the safety of passengers. However, due to the limited number of platform patrollers, the long platform length, and the large passenger flow of trains, there may be hundreds or even thousands of people on the platform at the same time. Relying on patrols to ensure passenger safety has certain limitations, and accidents of passengers falling off the platform occur from time to time.

[0003] In order to solve the above problems, the Chinese utility model patent with authorization announcement number CN216043346U discloses a driving device for a lifting type protective door. The device is actually a lifting device, which includes a column and a guide rail assembly. The column is a fixed column fixed on the platform ground. The guide rail assembly is vertically guided and installed on the column to form a lifting column. A screw nut driving mechanism is arranged between the column and the lifting column. The lifting column can be driven up and down by the screw nut driving mechanism. A plurality of sliders are arranged on the lifting column. In order to drive the sliders to move up and down, a steel wire is wound around the lifting column through fixed pulleys installed at the top and bottom. The steel wire is connected to the slider at the position corresponding to the lowest slider, and is connected to the column near the upper end of the column. Since the total length of the wire rope remains unchanged, when the lifting column rises relative to the column under the action of the screw nut mechanism, the wire rope will rise with the lowest slider, and lift other sliders in turn during the rising process. When in use, multiple lifting devices can be arranged at intervals along the platform, and then a safety rope can be connected between the sliders corresponding to two adjacent lifting devices, with the safety rope used as an isolation component, thereby forming a lifting isolation safety system. Under normal conditions, the lifting column is in a low position, and the safety rope is also in a low position and spread out at intervals up and down, which plays a role in blocking passengers. When a train enters the station, the lifting column rises under the drive of the screw nut mechanism, and drives the safety rope to rise and concentrate on the upper part of the lifting column, thereby forming a pedestrian passage below. After the passengers get on and off the train, the lifting column drops, and the safety device resets to normal.

[0004] In addition, the Chinese invention patent application with application publication number CN114776172A discloses a lifting structure for a lifting safety door and a lifting safety door including the same. Unlike the driving device of the lifting protection door, the lifting structure is provided with a rack on the fixed column, and a gear and a motor are provided on the lifting column. When working, the gear is driven by the motor, and the lifting column is driven to climb and descend through the cooperation of the gear and the rack. The Chinese invention patent application with application publication number CN116464383A discloses a screen door structure for a high-speed railway platform. Unlike the lifting device disclosed in the patent with authorization announcement number CN216043346U, a drive chain is provided between the fixed column and the lifting column of the lifting device. Specifically, a sprocket and a driving machine connected to the sprocket are provided on the fixed column. The drive chain is wound around the sprocket and fixedly connected to the bottom end of the lifting column. When in use, the sprocket can be driven to rotate by the driving machine, and then the lifting column can be driven to rise and fall by the drive chain.

[0005] In the lifting device disclosed in the patent with the authorization announcement number CN216043346U, the lifting and lowering of the lifting column relative to the fixed column is driven by a screw nut mechanism. After the lifting column is raised, the self-locking effect between the screw nut can be used to prevent the lifting column from accidentally falling, thereby avoiding harm to passengers passing below. However, in actual use, due to the particularity of train operation, it is necessary to first ensure that it does not affect the normal boarding and alighting of passengers. Once the above device fails, especially when the lifting column cannot be raised, it is impossible to raise the lifting column through external force intervention, which will seriously hinder passengers from getting on and off the train, but instead cause safety hazards. In the patent applications with application publication number CN114776172A and application publication number CN116464383A, although the gear rack and sprocket chain have no self-locking function and form a reversible transmission mechanism, when the lifting column cannot rise under the action of its original driving device, the external intervention force can be used to forcibly raise the lifting column to ensure efficient passage of passengers. However, when it is raised to the highest position, the position of the lifting column is maintained by the locking system of the motor. Once an electrical failure occurs, the lifting column may accidentally fall, causing injuries to passengers passing below. Utility Model Content

[0006] The utility model aims to provide a lifting device to solve the problem that the lifting device of the existing lifting isolation safety system cannot take into account both preventing accidental descent and being able to be forced to open in an emergency.

[0007] At the same time, the purpose of the utility model is also to provide a lifting isolation safety system using the above-mentioned lifting device, so as to solve the problem that the lifting device of the existing lifting isolation safety system cannot take into account both preventing accidental descent and being able to be forced to open in emergency situations, causing passenger injuries and hindering the timely passage of passengers.

[0008] In order to solve the above problems, the lifting device of the utility model adopts the following technical solution: the lifting device includes a fixed column and a lifting column, the lifting column is guided to lift and lower within a set height range on the fixed column, the lifting column is equipped with a driving device, a self-locking reduction device and a two-way transmission device are arranged in sequence between the driving device and the lifting column, and a clutch is arranged between the self-locking reduction device and the two-way transmission device, which is closed when the lifting column is lifted normally and separated in an abnormality.

[0009] Beneficial effects: The technical solution of the lifting device of the utility model is an improved invention. Specifically, by arranging a self-locking deceleration device between the driving device and the lifting column, when the lifting column of the lifting device is at any point, the self-locking effect of the self-locking deceleration device can be used to prevent it from accidentally falling. By arranging a two-way transmission device and arranging a clutch between the self-locking deceleration device and the two-way transmission device, when an emergency occurs and the lifting column cannot be lifted by the driving device, the self-locking deceleration device can be separated from the two-way transmission device by the clutch. Since the two-way transmission device is closer to the lifting column than the self-locking deceleration device, when it is separated from the self-locking deceleration device, the lifting column can be quickly lifted with the help of external force (such as manpower, backup power, etc.), thereby ensuring the traffic efficiency. In summary, the lifting device of the utility model solves the problem that the lifting device of the existing lifting isolation safety system cannot take into account both preventing accidental descent and being able to be forced to open in emergency situations.

[0010] Furthermore, the self-locking reduction device is a worm gear reducer or a cycloid pinwheel reducer.

[0011] By adopting a worm gear reducer, the reversing transmission characteristic of the worm gear reducer can be utilized to realize the reversing arrangement of the driving device, the self-locking reduction device and the bidirectional transmission device, thereby reducing the demand for installation space in the lifting device.

[0012] Furthermore, the driving device is a motor fixedly mounted on the worm gear reducer.

[0013] The driving device adopts a motor and is fixed on the worm gear reducer, so there is no need to set up a special motor mounting seat, which helps to reduce the overall size of the lifting device.

[0014] Furthermore, the motor is a DC motor, which has the advantage of low noise and can avoid disturbing passengers.

[0015] Furthermore, the clutch is an electronically controlled clutch.

[0016] The electronically controlled clutch has the advantages of quick action and easy operation, which can further improve the efficiency of emergency operation of the lifting column.

[0017] Furthermore, the electronically controlled clutch is an electromagnetic clutch.

[0018] The electromagnetic clutch has a compact structure and is easy to arrange in a small space of a lifting device.

[0019] Furthermore, the bidirectional transmission device is a chain transmission device, the sprocket of the chain transmission device is installed on the fixed column, and the chain is fixedly connected to the lifting column.

[0020] The chain transmission device has the advantages of high strength, high transmission synchronization and easy layout, which can help to make full use of space and facilitate the reasonable layout of various components inside the lifting device.

[0021] Furthermore, a mounting seat is arranged on the top of the fixing column, the sprocket is mounted on the mounting seat through a sprocket shaft, and the driving device and the sprocket are respectively arranged on the left and right sides of the fixing column.

[0022] The drive device and the sprocket are separately arranged on the left and right sides of the fixed column through the mounting seat on the top of the fixed column, which can make full use of the space on the left and right sides of the lifting device and minimize its size in the front and rear directions to avoid affecting the platform passability.

[0023] Furthermore, the axle of the sprocket is located in the middle of the lifting device in the front-rear direction.

[0024] By arranging the wheel axle of the sprocket in the middle of the lifting device in the front-rear direction, the space in the front-rear direction can be utilized to the maximum extent and the thickness of the lifting device can be reduced.

[0025] The lifting isolation safety system of the utility model adopts the following technical scheme: the lifting isolation safety system includes a lifting device for being arranged at intervals on the platform, the lifting device includes a fixed column and a lifting column, the lifting column is guided to lift and lower within a set height range on the fixed column, the lifting column is equipped with a driving device, a self-locking reduction device and a two-way transmission device are arranged in sequence between the driving device and the lifting column, and a clutch is arranged between the self-locking reduction device and the two-way transmission device, which is closed when the lifting column is lifting normally and separated in an abnormality.

[0026] Beneficial effects: The technical solution of the lifting isolation safety system of the utility model is an improved invention. Specifically, by setting a self-locking deceleration device between the driving device and the lifting column of the lifting device, when the lifting column of the lifting device is at any point, the self-locking effect of the self-locking deceleration device can be used to prevent it from accidentally falling. By setting a two-way transmission device and setting a clutch between the self-locking deceleration device and the two-way transmission device, when an emergency occurs and the lifting column cannot be lifted by the driving device, the self-locking deceleration device can be separated from the two-way transmission device by the clutch. Since the two-way transmission device is closer to the lifting column than the self-locking deceleration device, after being separated from the self-locking deceleration device, the lifting column can be quickly lifted with the help of external force (such as manpower, backup power, etc.), thereby ensuring the traffic efficiency. Through the above analysis, it can be seen that the lifting isolation safety system of the utility model can solve the problem that the lifting device of the existing lifting isolation safety system cannot take into account both preventing accidental descent and being able to be forced to open in emergency situations, causing passenger injuries and hindering the timely passage of passengers.

[0027] Furthermore, the self-locking reduction device is a worm gear reducer or a cycloid pinwheel reducer.

[0028] By adopting a worm gear reducer, the reversing transmission characteristic of the worm gear reducer can be utilized to realize the reversing arrangement of the driving device, the self-locking reduction device and the bidirectional transmission device, thereby reducing the demand for installation space in the lifting device.

[0029] Furthermore, the driving device is a motor fixedly mounted on the worm gear reducer.

[0030] The driving device adopts a motor and is fixed on the worm gear reducer, so there is no need to set up a special motor mounting seat, which helps to reduce the overall size of the lifting device.

[0031] Furthermore, the motor is a DC motor, which has the advantage of low noise and can avoid disturbing passengers.

[0032] Furthermore, the clutch is an electronically controlled clutch.

[0033] The electronically controlled clutch has the advantages of quick action and easy operation, which can further improve the efficiency of emergency operation of the lifting column.

[0034] Furthermore, the electronically controlled clutch is an electromagnetic clutch.

[0035] The electromagnetic clutch has a compact structure and is easy to arrange in a small space of a lifting device.

[0036] Furthermore, the bidirectional transmission device is a chain transmission device, the sprocket of the chain transmission device is installed on the fixed column, and the chain is fixedly connected to the lifting column.

[0037] The chain transmission device has the advantages of high strength, high transmission synchronization and easy layout, which can help to make full use of space and facilitate the reasonable layout of various components inside the lifting device.

[0038] Furthermore, a mounting seat is arranged on the top of the fixing column, the sprocket is mounted on the mounting seat through a sprocket shaft, and the driving device and the sprocket are respectively arranged on the left and right sides of the fixing column.

[0039] The drive device and the sprocket are separately arranged on the left and right sides of the fixed column through the mounting seat on the top of the fixed column, which can make full use of the space on the left and right sides of the lifting device and minimize its size in the front and rear directions to avoid affecting the platform passability.

[0040] Furthermore, the axle of the sprocket is located in the middle of the lifting device in the front-rear direction.

[0041] By arranging the wheel axle of the sprocket in the middle of the lifting device in the front-rear direction, the space in the front-rear direction can be utilized to the maximum extent and the thickness of the lifting device can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a structural schematic diagram of an embodiment of the lifting device of the utility model;

[0043] Figure 2 It is a structural schematic diagram of an embodiment of the lifting device of the utility model at another viewing angle.

[0044] In the figure: 101, lifting device; 102, pull rope; 11, fixing column; 12, lifting column; 13, clutch; 14, motor; 15, worm gear reducer; 16, driving sprocket; 17, chain; 18, mounting seat; 181, seat plate; 182, side plate; 183, shaft seat. DETAILED DESCRIPTION

[0045] Specific implementation of the lifting device of the utility model:

[0046] Train platforms are places where passengers get on and off trains. Since the edge is a sunken rail, its safety issue is particularly important. In the traditional mode, manual patrols are used to prevent passengers from approaching the dangerous area at the edge of the platform. Since the platform is generally long and the number of patrol officers is limited, there is often only one patrol officer every dozens of meters. Therefore, it is common to see patrol officers on the train platform holding loudspeakers to persuade passengers. It is not difficult to understand that the effect of this manual patrol method is very limited. The main reason why train platforms do not have opening and closing doors like subway platforms is that the specifications of subways are unified, and the stop positions are fixed each time. It is relatively simple to set up opening and closing doors. However, different trains often have different specifications, and it is impossible to set up safety doors like subway stations.

[0047] In the face of platform safety issues, the use of a lifting and isolation safety system with a larger span is a better choice. The main components of the lifting and isolation safety system are a lifting device 101 and a pull rope 102. There are multiple lifting devices 101, which are respectively set along the train platform. The pull rope 102 is connected between adjacent lifting devices 101 to form an isolation guardrail structure. Under normal circumstances, the lifting device 101 is in a lowered state. At this time, the pull rope 102 is down, which plays a role in blocking passengers. When the train enters the station, the lifting device 101 rises and drives the pull rope 102 to rise, thereby forming a passage for passengers to pass between the lifting devices 101 and under the pull rope 102. Due to the large span, it can adapt to trains of different specifications. After the pull rope 102 is raised, it basically does not affect the passage of passengers.

[0048] The lifting device 101 includes a fixed column 11 and a lifting column 12 vertically guided with the fixed column 11, wherein the lifting column 12 is connected to a driving device through a transmission mechanism. According to the records in the literature that have been found, there are roughly three types of transmission mechanisms currently used for lifting devices. One type is a screw-nut mechanism, in which the screw is connected to the driving device, and the nut is installed on the lifting column, and the lifting column is driven up and down by the driving device; the second type is a chain transmission mechanism, in which the chain is installed on the fixed column, and the lifting column is fixedly connected to the chain, and the driving device drives the chain to rotate forward and reverse, and synchronously drags the lifting column up and down; the third type is a rack and pinion mechanism, in which the rack is arranged on the lifting column, and the gear is installed on the fixed column. Driven by the driving device, the gear drives the rack to move up and down, thereby driving the lifting column to move up and down.

[0049] Among the above three types of transmission mechanisms, the screw-nut mechanism has a self-locking characteristic and is an irreversible transmission device. It can only convert the rotation of the screw into the up and down movement of the nut, but cannot convert the up and down movement of the nut into the rotation of the screw. When the power is lost, the nut will not be able to drive the screw to rotate, so that the lifting column 12 will not be able to fall under the action of gravity. Therefore, the accidental fall of the lifting column can be avoided. The chain transmission mechanism and the gear rack mechanism are two-way transmission devices, that is, each transmission component can be active and driven by each other. In other words, not only can the sprocket drive the chain to rotate, but the chain can also drive the sprocket to rotate. Not only can the gear drive the rack to move, but the movement of the rack can also drive the gear to rotate.

[0050] The benefits of using an irreversible transmission device have been mentioned above, that is, it can avoid the accident of the lifting column 12 falling accidentally, but it also has certain disadvantages, that is, when an electrical failure or other fault occurs, the lifting column 12 cannot be raised in time, which may cause passengers to be unable to get on and off the bus on time, or even cause riots and accidents. In the case of a two-way transmission device, although the lifting column 12 can be raised in an emergency, it will not be possible to avoid the lifting column 12 falling. Such equipment currently mostly prevents the lifting column from falling accidentally by locking the motor, but the use of electrical locking still has certain safety hazards. For example, when the motor fails or the electrical components burn out, it will cause it to be unable to lock the lifting column 12.

[0051] The lifting device 101 of the utility model combines a self-locking deceleration device with a two-way transmission device, and sets the two-way transmission device downstream of the self-locking deceleration device, that is, the self-locking deceleration device and the two-way transmission device are sequentially set from the driving device to the lifting column 12, and a normally closed clutch 13 is set between the self-locking deceleration device and the two-way transmission device. Since the clutch 13 is in a normally closed state, under normal circumstances, the power of the driving device reaches the lifting column 12 through the self-locking deceleration device-clutch-two-way transmission device, thereby driving the lifting column 12 to rise and fall. If any fault occurs during this process, the lifting column 12 will be kept in its fixed position under the action of the self-locking deceleration device, and will not fall accidentally. In addition, when facing a fault, the clutch 13 can be switched to a disengaged state, at which time the lifting column 12 can be lifted to a height where passengers can pass smoothly with the help of a spare driving system or manpower, and the position of the lifting column 12 can be maintained by switching the clutch 13 to a coupled state again. Thereby, the effect of preventing the lifting column 12 from falling accidentally is achieved without affecting passengers getting on and off the bus.

[0052] like Figure 1-2 As shown, in the embodiment 1 of the lifting device of the utility model, the driving device adopts a motor 14. The type of the motor 14 can be a DC motor, a servo motor or a stepper motor, etc., which will not be described here. The self-locking reduction device is a worm gear reducer 15. The housing of the worm gear reducer 15 is fixedly installed at the top position of the fixed column 11. The housing of the motor 14 is fixedly connected to the housing of the worm gear reducer 15. The output shaft of the motor 14 is connected to the worm of the worm gear reducer 15. The worm wheel of the worm gear reducer 15 is connected to the input shaft of the clutch 13, and the housing of the clutch 13 is further fixed to the fixed column 11. Due to the characteristics of the worm gear reducer 15 itself, the input shaft and the output shaft thereof are arranged at an angle. After the motor 14 is installed on the worm gear reducer 15, this characteristic is used to set the motor 14 to a structural form in which the motor shaft is arranged up and down, which reduces the space occupied in the corresponding direction and reduces the size of the lifting device 101 in the corresponding direction.

[0053] Of course, the above structure is only one implementation mode. In other implementation modes of this embodiment, the motor 14 can also be replaced by a hydraulic motor (when a hydraulic pump station is configured); the motor 14 can also be installed on the fixed column 11 and connected to the self-locking reduction device through a synchronous belt transmission mechanism, a gear transmission mechanism, a chain transmission mechanism, etc. In addition to the worm gear reducer 15, the self-locking reduction device can also be a cycloidal pinwheel reducer.

[0054] like Figure 1-2 As shown, in Example 2 of the utility model, based on Example 1, the clutch 13 adopts an electronically controlled clutch, more specifically, an electromagnetic clutch. The electromagnetic clutch has the advantages of small size and rapid response, and can quickly switch the state. In some other embodiments of this embodiment, when an electronically controlled clutch is adopted, the clutch 13 can also be a clutch controlled by a motor through a connecting rod mechanism, a cam mechanism, a chain transmission mechanism, a belt mechanism, etc. The connecting rod mechanism, the cam mechanism, the chain transmission mechanism, the belt mechanism, etc. drive the moving plate of the clutch 13 (for example, a pull line is used) to achieve the switching of its state. When the clutch 13 is an electronically controlled clutch, a remote controller can also be configured for it, and the switching of its engagement-disengagement state can be remotely controlled by the remote controller. Of course, in some embodiments, the clutch 13 can also be a manually operated clutch, in which case an operating handle, a foot pedal, etc. can be configured for it on the fixed column 11, and the engagement-disengagement state of the clutch can be switched manually.

[0055] like Figure 1-2As shown, in Example 3 of the utility model, based on Example 1 or 2, the bidirectional transmission device is a chain transmission device, and the sprockets of the chain transmission device are installed on the upper and lower parts of the fixed column 11, wherein the upper sprocket is the driving sprocket 16, and the chain 17 is fixedly connected to the lifting column 12 through the connecting block 19, so that the lifting column 12 can be dragged during the rotation around the chain. Specifically, in one implementation of the present embodiment, a mounting seat 18 is provided on the top of the fixed column 11, and the mounting seat 18 includes a seat plate 181 and side plates 182 arranged on the left and right sides of the seat plate 181, and an axle seat 183 is provided on the seat plate 181. The sprocket shaft of the driving sprocket 16 is rotatably mounted on the axle seat 183, one end of which is connected to the output shaft of the clutch 13, and the other end extends to the outside of the corresponding side plate of the mounting seat 18 to install the driving sprocket 16, thereby making the driving device and the sprocket respectively arranged on the left and right sides of the fixed column 11, compared with the prior art in which the sprocket is arranged in the middle of the fixed column 11 in the left and right directions, space can be saved here, for example, there is no need to increase the size (thickness) of the lifting device in the front-to-back direction in order to arrange the chain 17, and the wheel axle of the driving sprocket 16 is arranged in the middle of the lifting device in the front-to-back direction, which will maximize the use of the space in the front-to-back direction and reduce the thickness of the lifting device. Of course, in other implementations of this embodiment, the axle of the sprocket can also be set away from the middle of the fixed column in the front-to-back direction. Even in this case, since there is still an overlapping part in the projection between the sprocket and the fixed column 11 in the left-right direction, the effect of reducing the thickness of the lifting device can still be achieved.

[0056] It should be noted that in the above-mentioned implementation of the present embodiment, the sprocket shaft of the driving sprocket 16 is installed through the mounting seat 18 specially installed on the top of the fixed column. In other implementations of the present embodiment, the sprocket shaft 16 can also be directly installed on the fixed column 11. In this case, the redundant height of the fixed column 11 itself (the position that the lifting column cannot reach) can be used to install the sprocket shaft. The self-locking speed reduction device can also be directly installed on the fixed column 11.

[0057] In Example 4 of the present utility model, based on Example 1 or 2, the two-way transmission device adopts a rack and pinion transmission device, and the gear of the rack and pinion transmission device is connected to the self-locking reduction device. Specifically, the rack of the rack and pinion transmission device is arranged on the lifting column 12, the gear is installed on the fixed column 11, and the clutch 13 is arranged between the gear shaft of the gear and the self-locking reduction device. When the driving device is started, the rack can be driven to reciprocate up and down by the forward and reverse rotation of the gear, thereby driving the lifting column 12 to complete the lifting action. When an emergency occurs, the clutch 13 can be disconnected, and the lifting column 12 can be lifted to a height where passengers can pass smoothly by external force with the help of a spare drive system or manpower, and the position of the lifting column 12 can be maintained by switching the clutch 13 to the engaged state again. Thereby, the effect of preventing the lifting column 12 from accidentally falling is achieved without affecting passengers getting on and off the bus.

[0058] Specific implementation of the lifting isolation safety system of the utility model:

[0059] The lifting isolation safety system includes a plurality of lifting devices arranged at intervals along the platform and a pull rope connected between adjacent lifting devices. The lifting device is the lifting device of the utility model, and the pull rope and the connection method with the lifting device are both prior art and will not be described in detail here.

Claims

1. A lifting device, comprising a fixed column and a lifting column, wherein the lifting column is guided and lifted within a set height range on the fixed column, and the lifting column is equipped with a driving device, characterized in that: A self-locking deceleration device and a bidirectional transmission device are arranged in sequence between the driving device and the lifting column, and a clutch is arranged between the self-locking deceleration device and the bidirectional transmission device, which is closed when the lifting column is lifted normally and separated when it is abnormal.

2. The lifting device according to claim 1, characterized in that: The self-locking reduction device is a worm gear reducer or a cycloid pinwheel reducer.

3. The lifting device according to claim 2, characterized in that: The driving device is a motor fixedly mounted on the worm gear reducer.

4. The lifting device according to claim 3, characterized in that: The motor is a DC motor.

5. The lifting device according to claim 1, characterized in that: The clutch is an electronically controlled clutch.

6. The lifting device according to claim 5, characterized in that: The electronically controlled clutch is an electromagnetic clutch.

7. The lifting device according to claim 1, characterized in that: The bidirectional transmission device is a chain transmission device, the sprocket of the chain transmission device is installed on the fixed column, and the chain is fixedly connected to the lifting column.

8. The lifting device according to claim 7, characterized in that: A mounting seat is arranged on the top of the fixing column, the sprocket is mounted on the mounting seat through a sprocket shaft, and the driving device and the sprocket are arranged on the left and right sides of the fixing column respectively.

9. The lifting device according to claim 7 or 8, characterized in that: The wheel axle of the sprocket is located in the middle of the lifting device in the front-rear direction.

10. A lifting isolation safety system, comprising a lifting device for being arranged at intervals on a platform, the lifting device comprising a fixed column and a lifting column, the lifting column is guided to lift within a set height range on the fixed column, the lifting column is equipped with a driving device, characterized in that: A self-locking deceleration device and a bidirectional transmission device are arranged in sequence between the driving device and the lifting column, and a clutch is arranged between the self-locking deceleration device and the bidirectional transmission device, which is closed when the lifting column is lifted normally and separated when it is abnormal.

11. The lifting isolation safety system according to claim 10, characterized in that: The self-locking reduction device is a worm gear reducer or a cycloid pinwheel reducer.

12. The lifting isolation safety system according to claim 11, characterized in that: The driving device is a motor fixedly mounted on the worm gear reducer.

13. The lifting isolation safety system according to claim 12, characterized in that: The motor is a DC motor.

14. The lifting isolation safety system according to claim 10, characterized in that: The clutch is an electronically controlled clutch.

15. The lifting isolation safety system according to claim 14, characterized in that: The electronically controlled clutch is an electromagnetic clutch.

16. The lifting isolation safety system according to claim 10, characterized in that: The bidirectional transmission device is a chain transmission device, the sprocket of the chain transmission device is installed on the fixed column, and the chain is fixedly connected to the lifting column.

17. The lifting isolation safety system according to claim 16, characterized in that: A mounting seat is arranged on the top of the fixing column, the sprocket is mounted on the mounting seat through a sprocket shaft, and the driving device and the sprocket are arranged on the left and right sides of the fixing column respectively.

18. The lifting isolation safety system according to claim 16 or 17, characterized in that: The wheel axle of the sprocket is located in the middle of the lifting device in the front-rear direction.

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