Drive chain self-locking / release device and sliding door

Abstract

Drive chain self-locking / releasing device and sliding door. There are chain holes between the links of the drive chain. It includes a power coupling shaft, and the end of the power coupling shaft is inserted into or withdrawn from the chain hole under the drive of a telescopic mechanism. In the present invention, a power coupling shaft A that can be telescoped and inserted into the chain hole and a compression torsion spring constitute a transmission force self-locking mechanism for the chain, realizing the locking of the chain and reducing the locking failure of the structure and the pulling force during the release of the power device.

Description

Technical Field

[0001] The present invention relates to the fields of chain drive and industrial doors, and specifically to a drive chain self-locking / releasing device and a sliding door. Background Art

[0002] At present, the drive systems of high-speed cold storage sliding doors at home and abroad usually adopt chain drive; when the power of the chain drive is transmitted to the sliding door, and in order to still be able to open the door in case of emergency, a power combination device that can be self-locked and disengaged is usually required. At present, it is generally adopted that the tooth end of a fixed rotating structural member that obliquely stretches a spring is inserted into the double pitch of the chain, and the power is transmitted to the sliding door through the tooth end of the structural member, and the front end of the structural member is pulled down and rotated by a wire rope to disengage the power. However, when the pulling force of the stretching spring is too large, the manual release device cannot be opened. Since the structural member rotates obliquely, when the force of the stretching spring is small, the horizontal component force of the chain movement will cause the tooth end of the structural member to automatically disengage from the double pitch of the chain, and then the problem of chain derailment occurs.

[0003] Therefore, this way of combining the chain power has great limitations, has high requirements for the pulling force of the tension spring, and may not be manually released through the manual release device when the chain link tightly presses the tooth end of the structural member. And when opening the manual release, it is necessary to pull the manual release device with one hand, and at the same time, the other hand also needs to push the sliding door, and the operation is relatively difficult.

[0004] Therefore, the drive mode of the existing device is single, the structure is complex, and the manual release device is prone to various failures in a low-temperature environment, resulting in the door not being able to be opened in time, which will greatly reduce the safety performance; especially for cold storage doors, the internal environment is more than 20 degrees below zero, which will pose a great threat to personal safety. Summary of the Invention

[0005] In order to solve the existing problems, the present invention aims to provide a drive chain self-locking / releasing device and a sliding door. To achieve the above object, the technical solution adopted by the present invention is: there are chain holes between the chain links of the drive chain; it includes a power combination shaft A, and the end of the power combination shaft A is inserted into or withdrawn from the chain hole under the drive of a telescopic mechanism.

[0006] Preferably, the power combination shaft A is a long rod arranged vertically.

[0007] Preferably, the telescopic mechanism includes a spring in a compressed state, the power combination shaft A is sleeved in the spring, the lower end of the spring is fixed to the base, and the upper end of the spring is connected to the outer wall of the power combination shaft A.

[0008] Preferably, the upper end of the spring is limited by a rod body inserted horizontally into the power combination shaft A.

[0009] Preferably, a limiting structure is provided around the radial periphery of the drive chain. The limiting structure is composed of an upper plate, a lower plate, and two bolts connecting the upper plate and the lower plate.

[0010] Preferably, a nylon plastic sleeve is provided outside the bolt.

[0011] Preferably, it further includes a vertical adjusting fixing plate. The upper end of the adjusting fixing plate is provided with an upper plate formed by horizontal bending. The upper plate is connected to the lower plate through bolts to form the limiting structure; a horizontal base is also provided on the adjusting fixing plate; concentric circular holes for the power coupling shaft A to pass through are respectively provided on the upper plate and the lower plate; the power coupling shaft A is telescopically connected to the base through a spring, and after the spring is released, its upper end is inserted into the chain hole.

[0012] Preferably, concentric circular holes corresponding to the base are provided on the base, and the lower end of the power coupling shaft A can pass through the circular hole of the base.

[0013] Preferably, a convex platform for downward limiting is provided on the outer wall of the power coupling shaft A, and the size of the convex platform is larger than the circular hole of the base.

[0014] Preferably, an oblong hole for height adjustment is provided on the plate surface of the adjusting fixing plate, and the oblong hole is movably connected to a fixed connecting plate serving as a base through a height adjustment bolt.

[0015] Preferably, a horizontal bending plate is provided at the lower end of the fixed connecting plate, and the bending plate is used to fix the fixed connecting plate.

[0016] Preferably, the adjusting fixing plate is fixed by a locknut.

[0017] Preferably, a manual release mechanism is further provided, including a power coupling shaft B. The upper end of the power coupling shaft B is connected to the lower end of the power coupling shaft A, and a steel wire rope for manual pulling is provided at its lower end.

[0018] Preferably, a cavity is provided inside the power coupling shaft B. A hammer head is provided at the upper end of the steel wire rope; the hammer head is provided inside the cavity for limiting, and the rope body of the steel wire rope passes through the lower wall of the power coupling shaft B and extends out.

[0019] Preferably, a plastic sleeve is provided on the outer wall of the steel wire rope.

[0020] Preferably, a release mechanism is further provided, including a power coupling shaft B. The upper end of the power coupling shaft B is connected to the lower end of the power coupling shaft A, and a release groove is provided at the lower end of the power coupling shaft B; the handle end of a disc driven by a motor to rotate is inserted into the bottom end of the release groove to resist the reset tendency of the spring and control the lifting of the power coupling shaft B.

[0021] Preferably, external teeth are provided on the circumference of the disc, and the motor is engaged with the external teeth through a motor gear to control the rotation of the disc.

[0022] Preferably, a position sensor is further included. The position sensor collects the angle information of the disc and transmits it to the controller; the controller is used to control the operation of the motor.

[0023] Preferably, the disc and the motor are arranged on the fixed connecting plate.

[0024] The present invention further provides a sliding door, including the above-mentioned transmission chain self-locking device.

[0025] Compared with the prior art, the present invention forms a transmission force self-locking mechanism for the chain through the power combination shaft A that can be telescoped and inserted into the chain hole and the compression torsion spring, realizes the locking of the chain, and reduces the locking failure of the structure and the pulling force when the power device is released. The release mechanism provides two methods, automatic and manual, and can open the door automatically; and when an electrical fault occurs in the automatic release, it can also be released manually, which is more convenient and user-friendly, greatly improving the reliability and safety of the system; the structure is simple, the reliability is improved, and the maintenance is convenient; and it can operate independently. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic structural diagram of an embodiment of the present invention;

[0027] Figure 2 is a schematic structural diagram of an embodiment of the present invention (locking state);

[0028] Figure 3 is a schematic structural diagram of an embodiment of the present invention (release state);

[0029] Figure 4 is a schematic structural diagram of an embodiment of the present invention;

[0030] Figure 5 is a schematic structural diagram of the sliding door;

[0031] Figure 6 is Figure 5 the enlarged view within the circle in

[0032] Referring to the attached drawings, 101 is the adjusting fixed plate, 102 is the limit bolt, 103 is the plastic sleeve, 104 is the power coupling shaft A, 105 is the power coupling shaft B, 106 is the split pin, 107 is the compression spring, 108 is the gasket, 109 is the chain, 110 is the height adjusting fixed bolt, 111 is the adjusting plate fixing bolt, 112 is the locknut, 113 is the fixed connecting plate, 114 is the steel wire rope, 115 is the plastic casing, 116 is the steel wire rope plastic sleeve fixing plate, 117 is the large gear with handle disc, 118 is the rolling bearing, 119 is the fixed shaft, 120 is the motor gear, 121 is the motor, 122 is the position sensor, 200 is the new chain drive combination device, 201 is the pulley, 202 is the guide rail, 203 is the left sliding door, 204 is the right sliding door, 205 is the drive system, 206 is the left door manual release switch, 207 is the right door manual release switch. Detailed implementation manners

[0033] To make the above objects, features and advantages of the present invention more obvious and understandable, the following detailed description of the specific implementation manners of the present invention will be given in conjunction with the attached drawings. Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific implementations disclosed below.

[0034] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0036] Referring to Figures 1 to 4 , Figures 1 - 4 , what is shown is an embodiment of the present invention, mainly including the following two parts of mechanisms: a self-locking mechanism for chain drive power combination and a release mechanism for chain drive power combination.

[0037] The self-locking mechanism of the chain drive power combination is a transfer device for transmitting the chain drive power to the sliding door, providing the sliding door with power in the chain drive direction. The release mechanism of the chain drive power combination is used to release the combination of the sliding door and the chain drive power, so that the sliding door can be moved. Otherwise, the entire transmission device and the deceleration part cannot be driven by the hand pulling force.

[0038] The chain drive power coupling mechanism pushes the power coupling shaft A104 upward by the elastic force of the compression spring 107. In this embodiment, the outer diameter of the power coupling shaft A104 is larger than the spacing of the single-link chain 109 and smaller than the spacing of the double-link chain. When reaching the double-link chain of the chain 109, the power coupling shaft A104 will pass through the double-link chain and be inserted into the circular hole at the upper end of the upper adjustment fixing plate 101 and self-lock.

[0039] Preferably, the power of the power combination process should preferably use a spring in a compressed state, and the compression direction of the compression spring 107 should be perpendicular to the transmission direction of the chain 109. In this way, the compression spring 107 only needs to provide a small power to combine the power, and when the chain 109 moves, it will not generate a force in this direction to cause a separation problem.

[0040] Preferably, the upper end of the power coupling shaft A should be basically flush with the upper end of the adjustment fixing plate 101, so that the stroke of the power coupling shaft A104 is minimized, and the upper end and the middle part of the power coupling shaft A104 can withstand horizontal power transmission, ensuring the strength and reliability of the power coupling shaft A104.

[0041] Preferably, the chain 109 should be designed with upper, lower, left and right mechanism limits at the position of the device. In this case, the left and right limits are preferably achieved by using a nylon plastic sleeve 103 on the outside of the two limit bolts 102; the upper and lower positions are provided with an upper plate and a lower plate formed by the bending of the adjustment fixing plate 101 to form the upper and lower limits. In this way, the top of the power coupling shaft A104 can be smoothly inserted into the chain link. Preferably, there are three horizontal bending positions on the adjustment fixing plate 101, and three circular holes symmetrically arranged on the left and right are designed on both sides or in the middle, and the three circular holes are concentric circles. The lower circular hole is 2-3mm larger than the lower diameter of the power coupling shaft A104, and is used to guide the power coupling shaft A104 to move up and down, while eliminating the problem of non-concentricity caused by processing; the middle circular hole is slightly larger than the lower diameter of the power coupling shaft A104, and is used for the reference position of the power coupling shaft, while being able to move up and down flexibly; the upper circular hole is 2-3mm larger than the middle hole diameter, and is used to guide the movement of the power coupling shaft A104 and limit the power transmission. In this way, it is ensured that when there are errors in processing, the power coupling shaft A can still move flexibly up and down, and accurately transmit power and self-lock.

[0042] Preferably, both sides of the adjusting fixing plate 101 are designed as long round holes, and the up and down positions are adjusted by the height adjusting fixing bolts 110 to eliminate the height difference in up and down installation. Two connection holes for the adjusting plate fixing bolts 111 should preferably be designed at the bent part at the lower end of the adjusting fixing plate 101, and a locknut 112 should be used to fix at the lower end of the connection hole. In this way, during the transmission of a large power combination, the long round holes will not shift, resulting in the deformation and failure of the entire device.

[0043] Preferably, a boss is designed at the upper end of the shaft body of the power combination shaft A 104, and the diameter of the boss is larger than the diameter of the middle round hole. In this way, when the power combination is released downward, the boss can be used as a downward limit, preventing the power combination shaft A 104 from disengaging from the middle center hole and causing a change in position, resulting in the failure of the entire function.

[0044] See Figure 2 and Figure 3 , and further includes a release mechanism, which includes two parts: manual release and automatic release. In the manual release structure, by pulling the hammer head of the steel wire rope 114, the power combination shaft B 105 moves downward, and the compression spring 107 is further compressed until the upper boss of the power combination shaft A 104 disengages from the link, realizing the disengagement of the power combination; when the steel wire rope 114 is loosened, the compression spring 107 automatically presses the upper end of the power combination shaft A 104 into the double link. Similarly, for automatic release, through the control of the motor 121, the motor gear 120 is driven to rotate, and after the torque is increased through the reduction ratio of the motor gear 120, the handle disc large gear 117 is driven to rotate counterclockwise, thereby realizing the downward movement of the power combination shaft A 104, and thus realizing the electric disengagement of the power; when power combination is required, first the motor 121 moves in the opposite direction, and then the compression spring 107 presses the end of the power combination shaft A 104 into the link hole of the double link.

[0045] Preferably, the power combination shaft B 105 uses an arc groove as the combination position for the two power transmissions, and the height of the arc groove needs to be greater than the up and down movement stroke of the power combination shaft B 105, and the arc grooves for power transmission can be at the same position or different positions, as long as the stroke requirements and spatial structure requirements are met. In this way, the manual release and the automatic release can be independent of each other and both meet the functional requirements. Preferably, there is a hammer head at the front end of the steel wire rope 114, and the diameter of the hammer head is smaller than the width of the arc groove of the power combination shaft B. The hammer head can slide up and down in the arc groove when the steel wire rope 114 is not stressed. Preferably, a plastic sleeve 115 should be sleeved outside the steel wire rope 114, and this structural part can be purchased or self-made. The upper position of the plastic sleeve 115 is fixed by the steel wire rope plastic sleeve fixing plate. In this way, the resistance of the steel wire rope movement can be minimized, and the opening torque of the manual release can be reduced.

[0046] Preferably, on the lower end of one side of the arc groove of the power coupling shaft B105, a 7-shaped groove is opened, and the diameter of the groove is larger than the diameter of the steel wire rope and smaller than the hammer head of the steel wire rope. In this way, the steel wire rope hammer head can be directly placed into the groove and will not break away during the up and down movement. Of course, a cover plate can also be added outside the groove to seal the structure of the steel wire rope to ensure greater reliability.

[0047] Preferably, the upper end of the power coupling shaft B is connected to the power coupling shaft A by a thread and fixed with a fastener (such as an open pin or an elastic pin). Only in this way can the power coupling shaft B quickly transmit the power to the power coupling shaft A.

[0048] Preferably, the toothed disc large gear 117 and the motor gear 120 are a speed reduction structure, and the requirement of large torque can be achieved through the motor 121. The toothed disc gear 117 is an integral part of the gear and the toothed disc, which can reduce power loss and simplify the structure.

[0049] Preferably, a rolling bearing 118 is installed inside the toothed disc large gear 117. In this way, the central axis of the toothed disc large gear 117 can be fixed on the fixed connecting plate 113, and the toothed disc large gear 117 can stably transmit a large torque.

[0050] Preferably, the handle part of the toothed disc large gear 117 should be designed with an arc shape on the upper and lower sides and a flat surface on the left and right. The length should be as long as possible, and the size should be smaller than the groove size of the power coupling shaft B. In this way, power can be transmitted and sliding can be carried out inside.

[0051] Preferably, the encoder or position sensor 122 should be installed on the toothed disc large gear 117 as much as possible, so as to more accurately detect the rotation angle and position relationship of the toothed disc large gear 117. When installed at the motor 121 end, gear ratio conversion calculation is required, and at the same time, the accuracy may decrease due to gear slippage. See Figures 1 - 4, the single-link chain used for the transmission chain 109 has its interface connected by a double-link chain, which is a coupling mechanism for transmission power. Four limit bolts 102 are installed at the upper end of the adjustment fixing plate 101, two on each of the inner and outer sides of the chain 109. Among them, the plastic sleeve 103 is installed on the outer circle of the four limit bolts 102 and can move flexibly to prevent wear of the chain 109. The power coupling shaft A 104 is installed in the three round holes of the adjustment fixing plate 101, and is fixedly connected to the power coupling shaft B 105 at the lower end. There is a pin hole in the middle for inserting and fixing the split pin 106. The compression spring 107 is sleeved on the outer circle of the power coupling shaft A, and a large washer 108 is installed at each of the upper and lower ends. And a split pin 106 is installed on the upper washer 108 of the compression spring 107 to limit the upper position of the compression spring 107 through the split pin 106. The upper end of the power coupling shaft B 105 is fastened to the lower end of the power coupling shaft A 104 through bolts and pins. The outer part of the steel wire rope 114 is sleeved with a plastic sleeve 115. Among them, the upper end of the plastic sleeve 115 is limited and fixed through the steel wire rope plastic sleeve fixing plate 116, and the steel wire rope plastic sleeve fixing plate 116 is fixed on the fixed connecting plate 113 through bolts; there is a hammer head structure at the upper part of the steel wire rope 114, and this hammer head is stuck into the lower arc groove of the power coupling shaft B 105 and can move up and down. The disk gear with handle 117 is installed on the fixed shaft 119 through the rolling bearing 118 at the center. The disk handle end of the disk gear with handle 117 is inserted into the lower arc groove of the power coupling shaft B 105 and can rotate up and down. The motor gear 120 is fixed on the motor 121 and meshes with the disk gear with handle 117. The position sensor 122 is fixed on the outside of the disk gear with handle 117. The fixed shaft 119 and the motor 121 are fixed on the fixed connecting plate 113.

[0052] See Figure 2 , the automatic release device drives the disk gear with handle 117 to rotate clockwise to the position shown in the figure and above for reset through the motor 121. At this time, the manual release is through the pulling force on the steel wire rope 114. At this time, the power coupling shaft B and the power coupling shaft A will move upward under the pressure of the elastic force of the compression spring 107. When the double-link chain of the chain 109 reaches this position, the power coupling shaft A 104 will be inserted into the center of the double-link chain and the upper end hole of the adjustment fixing plate 101. In this way, when the chain moves, the chain power system will be transmitted to the whole device and the sliding door through the side of the power coupling shaft 1.

[0053] Figure 3 , 4In the embodiment, during the automatic release process, by controlling the motor 121 to rotate clockwise, the power is transmitted to the large gear 117 of the disk with handle through the motor gear 120. The large gear 117 of the disk with handle will rotate counterclockwise, and the rotation angle is calculated by the position sensor 122. At this time, the handle end of the large gear 117 of the disk with handle will pull the power coupling shaft B105 and the power coupling shaft A104 downward. The upper end of the power coupling shaft A104 will successively disengage from the upper round hole of the adjusting fixing plate 101 and the double chain links of the chain 109 until the position sensor 122 detects the preset angle value. When the boss at the upper end of the power coupling shaft A104 reaches the middle hole position of the adjusting fixing plate 101, it will stop with a limit. At this time, the large gear 117 of the disk with handle will move from the position of the large gear 117A of the disk with handle to the position of the large gear 117B of the disk with handle. At this time, in the manual release device, when the manual release wire rope 114 is not operated, the wire rope 114 will stay at the position of 114A and will not interfere with the automatic release at all.

[0054] Similarly, during the manual release process, when the wire rope 114 is pulled from the position of 114A to the position of 114B, the transmission chain 109 will disengage from the entire power coupling device. At this time, if the motor 121 is not turned on, the large gear 117 of the disk with handle will stay at the position of 117A, which has no impact on the manual release. The dual drive of automatic release and manual release is realized, ensuring the reliability and safety of the system.

[0055] Figure 5 、 Figure 6 In the embodiment, another embodiment of the present invention provides a cold storage sliding door, especially a double-opening high-speed sliding door adopting the above chain drive coupling device 200 (where the chain drive coupling device 200A is the coupling mechanism placed on the right side for the left sliding door 203 of the double-opening door; 200B is the coupling mechanism placed on the left side for the right sliding door 204 of the double-opening door). The drive system 205 is located above the left sliding door 203 and the right sliding door 204. Each sliding door moves in the guide rail 202 through the pulleys 201 on both sides above the door, and the power is transmitted through the new chain drive coupling device 200 in the middle position of the sliding door. Through the control of the control system, the normal opening and closing actions of the double-opening door are carried out in the combined state of the new chain drive coupling device 200. When a fault occurs, the power of the new chain drive coupling device 200 can be released in two ways: through the automatic control switch and the left manual opening release switch 206 and the right manual opening release switch 207, and then the left sliding door 203 and the right sliding door 204 can be opened and closed. In this way, the safety performance of the system is greatly improved.

[0056] The above embodiments have the characteristics of simple structure, strong reliability, convenient operation, high safety, and easy maintenance. At the same time, they also provide two release structures: automatic and manual. In case of an emergency, the combination of chain power can be automatically released by pressing a button to open the door, without the need to manually release with one hand and open the door with one hand. When an electrical fault occurs in the automatic release, the chain power can also be combined and released manually. Moreover, the self-locking structure of this device uses a compression spring 107 and vertical movement, which greatly reduces the locking faults of the structure and the pulling force during the release of the power device, and greatly improves the reliability and safety of the system.

[0057] The embodiments of the present invention have been described above in conjunction with the accompanying drawings. The structures given in the embodiments do not constitute limitations on the present invention. Skilled technicians in the art can make adjustments as needed, and various deformations or modifications within the scope of the appended claims are within the scope of protection.

Claims

1. A self-locking device for a transmission chain, characterized in that: There are chain holes between the links of the drive chain; it includes a power coupling shaft A, and the end of the power coupling shaft A is inserted into or withdrawn from the chain hole under the drive of a telescopic mechanism; the telescopic mechanism includes a spring in a compressed state, the power coupling shaft A is sleeved inside the spring, the lower end of the spring is fixed to the base, and the upper end of the spring is connected to the outer wall of the power coupling shaft A; A manual release mechanism is also provided, including a power coupling shaft B, the upper end of the power coupling shaft B is connected to the lower end of the power coupling shaft A, and a steel wire rope for manual pulling is provided at its lower end; a release groove is also provided at the lower end of the power coupling shaft B, and the handle end of a disc driven by a motor is inserted into the bottom end of the release groove to resist the reset trend of the spring to control the lifting of the power coupling shaft B.

2. The self-locking device for a transmission chain according to claim 1, characterized in that: The power coupling shaft A is a long rod arranged vertically.

3. The transmission chain self-locking device according to claim 2, characterized in that: The upper end of the spring is limited by a rod body inserted horizontally into the power coupling shaft A.

4. The self-locking device for a transmission chain according to claim 1, wherein: A limiting structure is provided around the circumference of the drive chain, and the limiting structure is composed of an upper plate, a lower plate, and two bolts connecting the upper plate and the lower plate.

5. The self-locking device for a transmission chain according to claim 4, characterized in that: It also includes a vertical adjustment fixing plate. The upper end of the adjustment fixing plate is provided with an upper plate formed by horizontal bending. The upper plate is connected to the lower plate through bolts to form the limiting structure; a horizontal base is also provided on the adjustment fixing plate; concentric circular holes for the power coupling shaft A to pass through are respectively provided on the upper plate and the lower plate; the power coupling shaft A is telescopically connected to the base through a spring, and the upper end of the spring is inserted into the chain hole after the spring is released.

6. The transmission chain self-locking device according to claim 5, characterized in that: There are corresponding concentric circular holes on the base, and the lower end of the power coupling shaft A can pass through the circular hole of the base.

7. The transmission chain self-locking device according to claim 6, characterized in that: A convex platform for downward limitation is provided on the outer wall of the power coupling shaft A, and the size of the convex platform is larger than the circular hole of the base.

8. The self-locking device for a transmission chain according to claim 4, characterized in that: Long circular holes for height adjustment are provided on the plate surface of the adjustment fixing plate, and the long circular holes are movably connected to the fixed connection plate through height adjustment bolts.

9. The self-locking device for a transmission chain according to claim 8, wherein: The lower end of the fixed connection plate is provided with a horizontal bending plate, and the bending plate is used to fix the fixed connection plate.

10. The self-locking device for a transmission chain according to claim 8, wherein: The adjustment fixing plate is fixed by a locknut.

11. The transmission chain self-locking device according to claim 1, wherein: A cavity is provided inside the power coupling shaft B, and a hammer head is provided at the upper end of the steel wire rope; the hammer head is arranged inside the cavity for limitation, and the rope body of the steel wire rope passes through the lower wall of the power coupling shaft B and extends out.

12. The transmission chain self-locking device according to claim 11, characterized in that: External teeth are provided on the circumference of the disc, and the motor controls the rotation of the disc by meshing with the external teeth through a motor gear.

13. The self-locking device for a transmission chain according to claim 11 or 12, characterized in that: It also includes a position sensor, and the position sensor collects the angle information of the disc and transmits it to the controller; the controller is used to control the operation of the motor.

14. A sliding door, characterized in that, It includes the drive chain self-locking device according to any one of claims 1-13.

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