Elevator overload safety caliper interlock

Abstract

The present invention discloses a safety caliper linkage device for an elevator during overload, which includes a base, a floating bottom plate, a spring, a lateral movement guide block, a lock slider, a synchronous slider, a worm gear drive mechanism, and a safety caliper. The base is fixed to the bottom of the elevator car. The floating bottom plate is connected to the elevator car via a spring. The lateral movement guide block is fixed to the floating bottom plate. The lock slider slidably engages with the lateral movement guide block in the lateral direction and moves up and down. The synchronous slider slidably engages with the lock slider in the vertical direction and moves in the lateral direction. The synchronous slider is moved laterally by the elevator car door. The base is provided with a vertical chute and a lateral movement chute. When the elevator car door is fully opened, the lock slider is in the vertical chute, and the bottom end of the vertical chute is lower than the bottom surface of the lateral movement chute. When the elevator car is overloaded, at least a part of the lock slider is fitted into the bottom end of the vertical chute and cannot move laterally. The lock slider moves up and down to rotationally drive the worm screw, and the worm wheel drives the safety caliper. The present invention can ensure safety by locking the car using a mechanical structure when the elevator is overloaded.

Description

[Technical Field]

[0001] The present invention relates to an elevator safety device, and more particularly to a safety caliper interlocking device for use in the event of an elevator overload, and belongs to the elevator technical field. [Background technology]

[0002] Elevators are special devices commonly found in daily life and are used very frequently in daily life, so elevator accidents sometimes occur. To ensure elevator operation safety, it is necessary to monitor elevator overload.

[0003] In the past, most elevator overload protection systems used overload alarms. After passengers enter the elevator, sensors detect the elevator's load. If the load exceeds the rated value, the system determines the elevator is overloaded and issues an alarm. However, this alarm system does not have a car lock function in the event of an overload. For example, if a power outage or other special circumstances occur, the elevator car may fall due to the overload, threatening the safety of passengers. Summary of the Invention [Problem to be solved by the invention]

[0004] In response to the above-mentioned drawbacks of the prior art, the present invention provides a safety caliper interlocking device for elevator overload that uses a mechanical structure to lock the elevator when it is overloaded without affecting the normal operation of the elevator. [Means for solving the problem]

[0005] The technical solution of the present invention is as follows: A safety caliper interlocking device for elevator overload, comprising: a base, a floating bottom plate, a spring, a lateral movement guide block, a lock slider, a synchronous slider, a worm gear drive mechanism, and a safety caliper, the base is fixed to the bottom of an elevator car, the floating bottom plate is installed in the elevator car and connected to the elevator car via the spring for carrying passengers, the lateral movement guide block is fixedly connected to the floating bottom plate, the lock slider slides laterally on the lateral movement guide block to move up and down synchronously, the synchronous slider slides vertically on the lock slider to move horizontally synchronously and is moved horizontally by the elevator car door, the base is provided with a vertical chute and a lateral movement chute connected to each other, the lateral movement guide block is provided on the vertical chute, and the synchronization slider is provided on the lateral movement chute; when the elevator car door is fully open, the lock slider is in the vertical chute, and the bottom end of the vertical chute is lower than the bottom surface of the lateral movement chute; when the elevator car is overloaded, at least a portion of the lock slider is fitted into the bottom end of the vertical chute and cannot move laterally; the safety caliper is provided on the base for clamping the elevator guide rail; the worm gear drive mechanism includes a worm wheel and a worm screw, the lock slider moves up and down to rotate the worm screw, and the worm wheel rotates to clamp or release the safety caliper.

[0006] Furthermore, in order to prevent unexpected clamping of the safety caliper due to the descent of the floating bottom plate caused by acceleration occurring during operation, a connection block is fixedly connected to the side of the lock slider, the worm gear drive mechanism includes a vertical rotation shaft and a horizontal rotation shaft, one end of the horizontal rotation shaft is processed as the worm screw, the vertical rotation shaft and the horizontal rotation shaft transmit power to each other, a first thread is processed on the vertical rotation shaft, a first nut fitted to the first thread is screwed onto the first thread, and the first nut is rotated within a first sleeve ring. a laterally extensible sleeve is connected to the connection block, the movable end of the laterally extensible sleeve is fixed to the first sleeve ring, the first nut is provided with a lock ring that rotates synchronously with the first nut, a plurality of pin holes are formed on the circumferential surface of the lock ring, and the fixed end of the laterally extensible sleeve is provided with an insertion pin that fits into the pin holes, the insertion pin is inserted into the pin hole when the elevator car door opens and is extracted from the pin hole when the elevator car door closes, and when the insertion pin is inserted into the pin hole, it prevents the first nut from rotating.

[0007] Furthermore, in order to reset the safety caliper when the elevator car doors are closed, a second thread is machined on the horizontal rotation shaft, a second nut is threadedly fitted onto the second thread, and the second nut is rotated within a second sleeve ring, the connecting block is connected to the second sleeve ring via a vertically telescopic sleeve, and a locking element is fixedly connected to the second nut, the locking element includes two locking rings spaced apart in the axial direction of the horizontal rotation shaft, and a locking plate is fitted on the horizontal rotation shaft between the locking rings, each of both sides of the locking plate can be locked to one of the two locking rings, the base is formed with a guide groove along the axial direction of the horizontal rotation shaft, one end of the locking plate is disposed within the guide groove, and a magnet is provided at an end of the guide groove, and after the elevator car doors are opened, one end of the locking plate is attracted to the magnet and positioned between the two locking rings, thereby releasing the locking by the locking rings.

[0008] Furthermore, when the elevator car door is open, the gap distance between the locking plate and the locking ring is greater than the depth to which the insertion pin is inserted into the pin hole.

[0009] Furthermore, a plurality of bosses are provided on both sides of the locking plate and distributed in the circumferential direction, and recesses are provided on the opposing sides of the locking ring to fit into the bosses.

[0010] Furthermore, two pairs of the safety calipers are provided, one on each side of the base.

[0011] Further, the safety caliper includes two friction blocks, a bracket that is attached to the friction blocks and slides onto the base, and when the bracket slides on the base, the friction blocks move closer to or farther away from each other, and a link is hinged to the bracket, and the end of the link is hinged to the worm wheel.

[0012] Furthermore, the synchronous slider and the third screw are combined to form a screw-nut motion pair, a first gear is fixedly mounted on the third screw, a second gear meshing with the first gear is mounted on the base, the second gear and a fourth screw form a screw-nut motion pair, the fourth screw is mounted parallel to the third screw, and a lever connected to the elevator car door is mounted on the fourth screw. The installation of the two sets of screws allows the synchronous slider to move in the opposite direction to the elevator car door, making it easy to leave movement space for the worm gear drive mechanism and the corresponding horizontal and vertical telescopic sleeves.

[0013] Furthermore, the lock slider is laterally slidably fitted to the lateral movement guide block via a lateral T-shaped groove, and the synchronization slider is longitudinally slidably fitted to the lock slider via a longitudinal T-shaped groove.

[0014] Furthermore, the vertical rotation shaft transmits power to the horizontal rotation shaft via a bevel gear, and the first nut and the first sleeve ring, and the second nut and the second sleeve ring are rotationally fitted together via bearings. [Effects of the Invention]

[0015] The advantages of the technical solution of the present invention are as follows: the present invention is installed at the bottom of the elevator car, and does not change the conventional elevator safety protection device, but adds a safety protection system to the conventional protection device, realizing safe braking action when the elevator is overloaded, and also realizing the safety caliper reset and safety locking function of the elevator door system when the elevator is overloaded, preventing the elevator door from closing and locking people inside the elevator, strengthening the overload protection performance before the elevator starts, and improving the safety of the elevator when picking up passengers. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 1 is a structural schematic diagram of a safety caliper interlocking device for use in elevator overload situations. [Figure 2] 1 is a structural schematic diagram of an elevator overload safety caliper interlocking device (base not shown). [Figure 3] FIG. [Figure 4] FIG. 4 is a schematic diagram of a connection structure between a worm gear and a safety caliper. [Figure 5] FIG. 10 is a partial structural schematic diagram of the first nut position. [Figure 6] FIG. 10 is a partial structural schematic diagram of the second nut position. DETAILED DESCRIPTION OF THE INVENTION

[0017] The present invention will be further described below in connection with examples. However, it should be understood that these examples are used only to explain the present invention and are not used to limit the scope of the present invention. After reading this description, various equivalent modifications of this description by those skilled in the art are within the scope defined in the claims attached to this application.

[0018] 1 to 3, the elevator overload safety caliper interlocking device according to this embodiment includes a base 1, a floating bottom plate 2, a spring 3, a lateral movement guide block 4, a lock slider 5, a synchronized slider 6, a worm gear drive mechanism, and a safety caliper 7. The base 1 is fixed to the bottom of the elevator car and provides a mounting base for the elevator overload safety caliper interlocking device.

[0019] The floating bottom plate 2 is installed inside the elevator car and serves as the floor of the car to carry passengers. The floating bottom plate 2 and the elevator car are connected via springs 3, which are compressed to different distances depending on the weight of the passengers. Two springs 3 are shown in the figure, but multiple springs 3 can be installed as needed.

[0020] In this embodiment, in addition to the base 1, floating bottom plate 2, and spring 3, there are two sets of lateral movement guide block 4, lock slider 5, synchronized slider 6, worm gear drive mechanism, and safety caliper 7, each of which is connected to one elevator car door, preventing the elevator car door from closing in the event of an overload. The specific structure will be explained below using one of the sets.

[0021] A horizontal movement guide block 4 is fixedly connected to the bottom of the floating bottom plate 2 via a straight rod, and a vertical chute 101 is provided on the base 1 to restrict the horizontal movement guide block 4 to the vertical chute 101, which moves up and down in accordance with the up and down movement of the floating bottom plate 2. A horizontal T-shaped groove is formed on the bottom surface of the horizontal movement guide block 4, and a T-shaped strip 501 is provided on the top surface of the lock slider 5 to fit into the horizontal T-shaped groove. The lock slider 5 slides laterally on the horizontal movement guide block 4 and moves up and down synchronously. That is, when the horizontal movement guide block 4 moves up and down, it moves the lock slider 5 up and down within the vertical chute 101, and the lock slider 5 can move laterally.

[0022] One side of the lock slider 5 (this side is the side in the opening and closing direction of the elevator car door, and is defined as the left and right side in this embodiment) is provided with a protruding T-shaped strip 501 similar to the top surface, and the side of the synchronized slider 6 is provided with a vertical T-shaped groove that fits into this protruding T-shaped strip 501. In this way, when the lock slider 5 moves laterally to the left and right, it can move the synchronized slider 6 (the synchronized slider 6 can move the lock slider 5), and the synchronized slider 6 does not affect the up and down movement of the lock slider 5. The base 1 is provided with a horizontal movement chute 102 that is connected to the vertical chute 101, and the lock slider 5 and the synchronized slider 6 can move laterally within the horizontal movement chute 102.

[0023] The bottom of vertical chute 101 is lower than the bottom of lateral movement chute 102, and the elastic force of spring 3 connected between floating bottom plate 2 and the elevator car is set according to the weight that the elevator car can bear. When the motor car is overloaded, the bottom of lock slider 5 fits into the bottom of vertical chute 101 and is lower than the bottom of lateral movement chute 102, preventing lock slider 5 from sliding along lateral movement chute 102 and preventing synchronous slider 6 from sliding laterally. Because synchronous slider 6 moves synchronously with the elevator car door via a set of transmission members, when synchronous slider 6 cannot move laterally, the elevator car door cannot move laterally either, thereby achieving the purpose of preventing the elevator car door from closing when overloaded.

[0024] To achieve a compact device structure and rational use of the space in the base 1, the transmission member uses two sets of screw and nut mechanisms to move the synchronous slider 6 in the opposite direction to the elevator car door. Specifically, the synchronous slider 6 and a third screw 8 are combined to form a screw-nut motion pair, and the third screws 8 are installed laterally on the left and right. A first gear 9 is fixedly installed on the third screw 8, and a second gear 10 meshing with the first gear 9 is rotatably installed on the base 1, and the second gear 10 and a fourth screw 11 form a screw-nut motion pair. The fourth screw 11 is installed parallel to the third screw 8, and levers 12 that connect to the elevator car door are connected to both ends of the fourth screw 11. The elevator car door may be installed so as to be engaged between the two levers 12, or a hole may be installed in the elevator car door, with the head end of the lever 12 inserted into the hole to achieve interlocking with the elevator car door. In this way, when the elevator car door moves laterally left and right, it moves the fourth screw 11 laterally left and right, further rotating and driving the second gear 10. Under the driving of the second gear 10, the first gear 9 rotates the third screw 8, thereby further driving the synchronous slider 6 to move laterally left and right.

[0025] Another function of this embodiment of the present invention is that when the elevator is overloaded, excessive downward movement of the floating bottom plate 2 causes the safety calipers 7 to clamp the elevator guide rail, preventing the elevator car from moving, thereby preventing unexpected elevator car slippage due to overload or power outages. Specifically, as shown in FIGS. 1 and 4 , safety calipers 7 are provided on both sides of the base 1 to clamp the elevator guide rail. Each safety caliper 7 includes two friction blocks 701, each of which is fitted with a bracket 702 that slides into the base 1. Movement of the brackets 702 moves the friction blocks 701 toward or away from each other. When the friction blocks 701 approach each other, they can clamp the elevator guide rail. The brackets 702 are driven by links 703 connected to the brackets 702, and the two links 703 are connected to and intersect with the two brackets 702, respectively.

[0026] The worm gear drive mechanism includes one vertical rotation shaft 13 and one horizontal rotation shaft 14, the horizontal rotation shafts 14 being arranged horizontally on the left and right sides, the vertical rotation shaft 13 being perpendicular to the horizontal rotation shaft 14, and at the ends of the vertical rotation shaft 13 and the horizontal rotation shaft 14, the horizontal rotation shaft 14 and the vertical rotation shaft 13 can transmit power to each other through a pair of bevel gears 15. The head end of the horizontal rotation shaft 14 is machined as a worm screw 16, and both sides of the worm screw 16 are meshed with two worm wheels 17 in a horizontal state. The other end of the link 703 connected to the bracket 702 of the safety caliper 7 is hinged at a position close to the outer circumference of the worm wheel 17. In this way, when the lateral rotation axis 14 rotates, it drives the two worm wheels 17 to rotate in opposite directions, thereby pulling the link 703, causing the friction blocks 701 to move closer to or apart from each other, and further clamping or releasing the safety caliper 7.

[0027] As shown in Figures 5 and 6, a connection block 19 is fixedly connected to the rear side of the lock slider 5 via a horizontal bar 18. A first screw 1301 is machined on the vertical rotation shaft 13, and a first nut 20 is threadedly attached to the first screw 1301. The first nut 20 is attached to a first sleeve ring 21 via a bearing, and the two are rotationally fitted together. A laterally extensible sleeve 22 is connected to the connection block 19, and the movable end of the laterally extensible sleeve 22 is fixed to the first sleeve ring 21. A lock ring 23 that rotates synchronously with the first nut 20 is attached to the first nut 20, and a plurality of pin holes 2301 are formed on the circumferential surface of the lock ring 23. An insertion pin 24 that fits into the pin hole 2301 is attached to the fixed end of the laterally extensible sleeve 22. As the lock slider 5 moves laterally in this manner, the connection block 19 moves laterally in sync, and the insertion pin 24 is inserted into the pin hole 2301 of the lock ring 23 to prevent the rotation of the first nut 20. In this case, the lock slider 5 moves up and down to move the connection block 19 up and down, which in turn moves the first nut 20 up and down. Since the first nut 20 is locked by the insertion pin 24 and cannot rotate, the first screw 1301 (vertical rotation shaft 13) rotates, thereby driving the horizontal rotation shaft 14 to rotate, and the safety caliper 7 operates. However, when the elevator car doors are fully open, the insertion pin 24 is inserted into the pin hole 2301, and when the elevator car doors begin to close, the insertion pin 24 is extracted from the pin hole 2301. In this way, after the elevator car door is closed, the insertion pin 24 is in an extracted state, the first nut 20 can rotate freely, and the floating bottom plate 2 moves up and down, driving the first nut 20 to move up and down, while the first nut 20 rotates, the first screw 1301 cannot be rotated, and the safety caliper 7 does not operate.

[0028] A second thread 1401 is machined on the horizontal rotation shaft 14, and a second nut 25 is threadedly fitted onto the second thread 1401. The second nut 25 is mounted within a second sleeve ring 26 via a bearing, allowing the two to rotate together. A vertically telescopic sleeve 27 is connected to the connection block 19, and the movable end of the vertically telescopic sleeve 27 is fixed to the second sleeve ring 26. A locking member is fixedly connected to the second nut 25, and this locking member includes two locking rings 28 spaced apart in the axial direction of the horizontal rotation shaft 14, and a locking plate 29 is fitted onto the horizontal rotation shaft 14 between the locking rings 28. A plurality of bosses 2901 are provided on both sides of locking plate 29 and are distributed circumferentially. Recesses 2801 are provided on the opposing sides (the sides facing locking plate 29) of locking ring 28 to fit into bosses 2901. When locking plate 29 moves laterally and comes into close contact with one of locking rings 28, bosses 2901 are inserted into recesses 2801, preventing the locking member from rotating, i.e., preventing second nut 25 from rotating. Base 1 is provided with guide groove 103 along the axial direction of lateral rotation shaft 14. One end of locking plate 29 is located within guide groove 103, and magnet 30 is provided at the end of guide groove 103. When the elevator car door opens, one end of locking plate 29 is attracted to magnet 30 and positioned between two locking rings 28, releasing it from locking by locking ring 28. In this state, the distance between the locking plate 29 and the locking ring 28 is greater than the depth to which the insertion pin 24 is inserted into the pin hole 2301. The operation of rotating the second nut 25, the locking member, and the locking plate 29 laterally will be described below in the device operation section.

[0029] The operation process of the elevator overload safety caliper interlocking device of this embodiment is as follows:

[0030] Explaining the elevator car door on one side, when the elevator car door opens, lever 12 moves fourth screw 11 to the left, rotating second gear 10, which in turn rotates third screw 8 via first gear 9. Driving third screw 8 causes synchronous slider 6 to slide locking slider 5 to the right limit position in horizontally moving chute 102 of base 1. At this time, insert pin 24 connected to horizontally telescopic sleeve 22 is inserted into pin hole 2301 of locking ring 23, and the locking member of second nut 25 pushes locking plate 29 to move to the end of guide groove 103 of base 1 with magnet 30. At the right limit position, locking plate 29 is attracted by magnet 30, releasing locking plate 29 from left locking ring 28 of the locking member and maintaining a certain distance from right locking ring 28, which distance is greater than the depth to which insert pin 24 is inserted into pin hole 2301. After a passenger enters the elevator car, the floating bottom plate 2 moves downward, and the horizontal movement guide block 4 moves the locking slider downward, and further moves the connection block 19 downward. The connection block 19 moves downward, and moves the first nut 20 downward. At this time, the locking of the insertion pin 24 rotates the vertical rotation shaft 13, which further rotates the horizontal rotation shaft 14. The friction block 701 of the safety caliper 7 gradually approaches, In a state that does not result in overload, It does not come into contact (or only slightly comes into contact) with the elevator guide rail. After an overload occurs, the floating bottom plate 2 moves further downward, and the bottom of the lock slider 5 fits into the bottom end of the vertical chute 101, preventing it from moving laterally. At this time, the synchronous slider 6 acts in the opposite direction on the elevator car door, preventing it from moving laterally and further closing. In addition, the connecting block 19 moves further downward, bringing the friction block 701 of the safety caliper 7 closer, thereby clamping the elevator guide rail. If a power outage occurs in this state, the safety caliper 7 of this device can provide a second guarantee by preventing the elevator car from moving up or down unexpectedly.

[0031] When a passenger exits the elevator car, the floating bottom plate 2 moves the lateral movement guide block 4 and the lock slider 5 upward under the action of the spring 3. When an overweight state occurs, the bottom of the lock slider 5 is higher than the bottom of the lateral movement chute 102 of the base 1, allowing the lock slider 5 to move further laterally. The elevator car door moves to the right to close, and the synchronous slider 6, through the transmission of the third screw 8 and the fourth screw 11, moves the lock slider 5 to the left. When the elevator car door starts to move to the right, the locking member moves to the left, but neither of the two locking rings 28 is locked with the locking plate 29, and the insertion pin 24 is extracted from the pin hole 2301. During this process, the locking member is unlocked, so the second nut 25 can rotate freely. When the second nut 25 moves to the left, it does not drive the lateral rotation shaft to rotate. After the insertion pin 24 is completely removed from the pin hole 2301, the locking element continues to move left, locking the right locking ring 28 and locking plate 29 of the locking element. At this time, the second nut 25 cannot rotate due to the locking element's locking. As the elevator car door moves further right to close, the second nut 25 moves left, rotating the horizontal rotation shaft 14. The worm gear drives the friction block 701 of the safety caliper 7 apart, releasing the elevator guide rail. While the horizontal rotation shaft 14 rotates, the vertical rotation shaft 13 also rotates. Because the insertion pin 24 has already been removed from the pin hole 2301, the locking ring 23 and first nut 20 can rotate freely. Therefore, the rotation of the vertical rotation shaft 13 can rotate the first nut 20 without moving it up and down, ensuring that the device does not stick. When the elevator reaches the designated floor and the elevator car door opens, the elevator car door moves to the left, and the operation process of each part is the opposite of the elevator car door moving to the right, so no further explanation will be given. In this way, the device achieves the purpose of ensuring safety through mechanical locking in the event of an overload.

Claims

1. An elevator overload safety caliper interlocking device, The elevator comprises a base, a floating bottom plate, a spring, a lateral movement guide block, a lock slider, a synchronous slider, a worm gear drive mechanism, and a safety caliper, the base is fixed to the bottom of an elevator car, the floating bottom plate is provided in the elevator car and connected to the elevator car via the spring for carrying passengers, the lateral movement guide block is fixedly connected to the floating bottom plate, the lock slider slides laterally on the lateral movement guide block to move up and down synchronously, the synchronous slider slides vertically on the lock slider to move horizontally synchronously and is moved horizontally by the elevator car door, the base is provided with a vertical chute and a lateral movement chute connected to each other, and the lateral movement guide block is provided on the vertical chute. the synchronization slider is provided on the lateral movement chute, and when the elevator car door is fully open, the lock slider is in the vertical chute, and a bottom end of the vertical chute is lower than a bottom surface of the lateral movement chute, and when the elevator car is overloaded, at least a part of the lock slider is fitted into the bottom end of the vertical chute and cannot move laterally, and the safety caliper is provided on the base for clamping an elevator guide rail, and the worm gear drive mechanism includes a worm wheel and a worm screw, and the lock slider moves up and down to rotate and drive the worm screw, and the worm wheel rotates to drive the clamping or release of the safety caliper.

2. A connecting block is fixedly connected to the side of the lock slider, the worm gear drive mechanism includes a vertical rotation shaft and a horizontal rotation shaft, one end of the horizontal rotation shaft is machined as the worm screw, the vertical rotation shaft and the horizontal rotation shaft transmit power to each other, a first thread is machined on the vertical rotation shaft, a first nut is threadedly fitted to the first thread, the first nut is rotated within a first sleeve ring, a horizontal telescopic sleeve is connected to the connecting block, and a movable end of the horizontal telescopic sleeve is connected to the first sleeve ring.

2. The safety caliper interlocking device for use in an elevator overload according to claim 1, wherein the first nut is provided with a lock ring fixed to a bling, the first nut being provided with a lock ring that rotates synchronously with the first nut, the lock ring has a plurality of pin holes on its circumferential surface, the fixed end of the laterally extensible sleeve is provided with an insertion pin that fits into the pin holes, the insertion pin is inserted into the pin holes when the elevator car door is opened and is extracted from the pin hole when the elevator car door is closed, and when the insertion pin is inserted into the pin hole, it prevents the first nut from rotating.

3. 3. The safety caliper interlocking device for elevator overload according to claim 2, wherein: the horizontal rotation shaft is machined with a second thread, a second nut threadedly engaged with the second thread, the second nut is rotated within a second sleeve ring, the connecting block is connected to the second sleeve ring via a vertically extensible sleeve, and a locking element is fixedly connected to the second nut, the locking element includes two locking rings spaced apart in an axial direction of the horizontal rotation shaft, a locking plate is fitted on the horizontal rotation shaft between the locking rings, each of both surfaces of the locking plate can be locked to one of the two locking rings, the base is formed with a guide groove along the axial direction of the horizontal rotation shaft, one end of the locking plate is disposed in the guide groove, and a magnet is provided at an end of the guide groove, and after the elevator car door is opened, one end of the locking plate is attracted to the magnet and located between the two locking rings, thereby releasing the locking by the locking rings.

4. 4. The elevator overload safety caliper interlocking device according to claim 3, wherein when the elevator car door is open, the distance between the locking plate and the locking ring is greater than the depth to which the insertion pin is inserted into the pin hole.

5. 4. The safety caliper interlocking device for elevator overload as claimed in claim 3, wherein a plurality of bosses are provided on both sides of the locking plate and distributed in the circumferential direction, and recesses are provided on opposite sides of the locking ring to fit into the bosses.

6. 2. The safety caliper interlocking device for use in an elevator overload according to claim 1, wherein the safety caliper is provided in two pairs, each of which is provided on either side of the base.

7. 2. The safety caliper interlocking device for use in an elevator overload according to claim 1, wherein the safety caliper includes two friction blocks, and a bracket that is fitted to the base and slides on the base is attached to the friction blocks, and when the bracket slides on the base, the friction blocks move toward or away from each other, and a link is hinged to the bracket, and an end of the link is hinged to the worm wheel.

8. 4. The safety caliper interlocking device for elevator overload as claimed in claim 2 or 3, wherein the synchronous slider and a third screw are combined to form a screw-nut kinematic pair, a first gear is fixedly mounted on the third screw, a second gear meshing with the first gear is mounted on the base, the second gear and a fourth screw constitute a screw-nut kinematic pair, the fourth screw is mounted in parallel to the third screw, and a lever connected to the elevator car door is mounted on the fourth screw.

9. 2. The elevator overload safety caliper interlocking device according to claim 1, wherein the lock slider is laterally slidably fitted to the lateral movement guide block via a lateral T-shaped groove, and the synchronized slider is longitudinally slidably fitted to the lock slider via a longitudinal T-shaped groove.

10. 4. The safety caliper interlocking device for use in an elevator overload according to claim 3, wherein the vertical rotation shaft transmits power to the horizontal rotation shaft via a bevel gear, and the first nut and the first sleeve ring and the second nut and the second sleeve ring are rotationally fitted together via bearings.

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