Elevator door lock switch

Abstract

The present invention provides an elevator door lock switch, comprising: a first contact part, a second contact part and a driving mechanism, the clutch of the first contact part and the second contact part corresponds to the opening and closing of the elevator door lock switch, a driving mechanism is installed beside the first contact part and the second contact part, the driving mechanism is used to act on the first contact part and / or the second contact part, when the elevator door lock switch is closed, the driving mechanism drives the first contact part and the second contact part to clutch, and the driving mechanism does not affect the normal opening and closing of the first contact part and the second contact part. The elevator door lock switch solves the problem in the prior art that a spring shaft needs to be manually bounced to bounce the spring shaft away from impurities on the rotating shaft.

Description

Technical Field

[0001] The invention relates to the field of elevators, and in particular to an elevator door lock switch. Background Art

[0002] The Chinese patent discloses an elevator door lock switch with application number CN201110335568.5, which includes a switch bottom box, a main contact device, an auxiliary contact device and a circuit system, wherein the auxiliary contact device is connected to the circuit system, a mounting hole is provided on one side of the switch bottom box, the surface of the switch bottom box is covered by a cover plate, a rotating rod connecting assembly is provided on the switch bottom box, the rotating rod connecting assembly includes a tongue pin and a rotating shaft that are rotatably connected to each other, the tongue pin passes through the mounting hole, the rotating shaft is rotatably installed on the switch bottom box, the rotating shaft is connected to a telescopic device that can restore the rotating shaft to its position, the tongue pin is provided with a metal contact sheet for connecting the main contact device and a safety device for insurance, and the rotating shaft passes through the cover plate to connect the rocker arm assembly. Although the switch is opened when the elevator door is opened and closed when the elevator door is closed, and is used to detect the opening and closing of the elevator door, the switch has the following disadvantages:

[0003] Due to the long-term use of the switch, impurities are easily present at the contact point between the rotating shaft and the spring shaft, resulting in poor contact between the rotating shaft and the spring shaft. The maintenance personnel need to move the spring shaft to make the spring shaft bounce and bounce off the impurities on the spring shaft and the rotating shaft. The entire elevator needs to be stopped and the elevator needs to be opened, and the whole operation is troublesome. Summary of the invention

[0004] The present invention provides an elevator door lock switch, which solves the problem in the prior art that a spring shaft needs to be manually bounced to bounce impurities off the spring shaft and the rotating shaft.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] An elevator door lock switch comprises: a first contact part, a second contact part and a driving mechanism, wherein the clutch of the first contact part and the second contact part corresponds to the opening and closing of the elevator door lock switch, and a driving mechanism is installed beside the first contact part and the second contact part, and the driving mechanism is used to act on the first contact part and / or the second contact part. When the elevator door lock switch is closed, the driving mechanism drives the first contact part and the second contact part to clutch, and the driving mechanism does not affect the normal opening and closing of the first contact part and the second contact part (that is, it does not affect the realization of the basic opening and closing function of the entire elevator door lock switch).

[0007] Compared with the prior art, the present invention has the following beneficial effects:

[0008] By setting up the driving mechanism, it is achieved that the first contact part and the second contact part do not affect the normal opening and closing functions, thereby ensuring the realization of the normal opening and closing functions. At the same time, when the first contact part and the second contact part are in the closing function, the first contact part and the second contact part are forced to separate from each other, and it is ensured that the first contact part and the second contact part can normally return to the closed position under the elastic force of the first contact part or the second contact part, thereby ensuring the realization of the normal functions. It is achieved that impurities such as dust on the first contact part and the second contact part are ejected under the action of the driving mechanism, thereby ensuring that the first contact part and the second contact part can normally execute the closing command after the dust is ejected, thereby facilitating the maintenance of the entire elevator door lock switch, and avoiding the passengers being trapped in the elevator for a long time due to the elevator door lock switch failing to close properly. The elevator door lock switch can be repaired in time, and the passengers trapped in the elevator can be rescued in time, thereby ensuring safety.

[0009] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a cross-sectional view of the first spring sheet and the second spring sheet when the driving mechanism in Example 1 pushes the first spring sheet.

[0011] Figure 2 It is a cross-sectional view of the first spring sheet and the second spring sheet when the driving mechanism in Example 1 pushes the second spring sheet.

[0012] Figure 3 It is a cross-sectional view of the first spring sheet and the second spring sheet when the driving mechanism in Example 2 pushes the first spring sheet.

[0013] Figure 4 It is a cross-sectional view of the first spring sheet and the second spring sheet when the driving mechanism in Example 2 pushes the second spring sheet.

[0014] Figure 5 This is a schematic diagram of the structure of the elevator door lock switch in Example 3.

[0015] Figure 6 It is a cross-sectional view of the first spring piece and the second spring piece in Example 4.

[0016] Figure 7 for Figure 6 AA section view of the middle drive mechanism.

[0017] Figure 8 for Figure 7 Enlarged view of point B in the middle.

[0018] Figure numerals: housing 1, elevator door lock switch 2, first contact portion 21, rotating hook 211, first spring piece 212, first contact 213, second contact portion 22, second spring piece 221, second contact 222, driving mechanism 23, body 231, push rod 232, roller 233, rotating disk 231', pushing block 232', motor 233', hanging ear 24, connecting assembly 25, wedge block 250, mounting block 251, second spring 252, slider 253, mounting cylinder 254, second roller 255, hanging rod 256, connecting block 257, third spring 258, bayonet 259, fourth spring 260, suspension assembly 27, central axis 271, coil spring 272, rotating cylinder 273, pull rope 274. DETAILED DESCRIPTION

[0019] In order to make the technical means, creative features, objectives and functions achieved by the present invention clearer and easier to understand, the present invention is further explained below in conjunction with the accompanying drawings and specific implementation methods.

[0020] [Example 1:

[0021] like Figure 1 as well as Figure 2 As shown, the present invention proposes an elevator door lock switch, including: a first contact part 21, a second contact part 22 and a driving mechanism 23, the clutch of the first contact part 21 and the second contact part 22 corresponds to the opening and closing of the elevator door opening and closing detection circuit, and the driving mechanism 23 is installed next to the first contact part 21 and the second contact part 22. The driving mechanism 23 is used to act on the first contact part 21 and / or the second contact part 22. When the elevator door opening and closing detection circuit is closed, the driving mechanism 23 drives the first contact part 21 and the second contact part 22 to clutch, and the driving mechanism 23 does not affect the normal opening and closing of the first contact part 21 and the second contact part 22 (that is, it does not affect the realization of the basic opening and closing function of the entire elevator door opening and closing detection circuit). Load 1 is a lamp.

[0022] In order to realize the separation of the first contact part 21 and the second contact part 22 under the force of the driving mechanism 23, and to prevent the driving mechanism 23 from hindering the normal approach and separation of the first contact part 21 and the second contact part 22, the first contact part 21 includes: a rotating hook 211, a first elastic piece 212 and a first contact 213, and the second contact part 22 includes: a second elastic piece 221 and a second contact 222. The first contact part and the second contact part are both arranged in a shell, and one end of the rotating hook 211 can be rotatably installed on the inner wall of the shell, and the rotating hook 2 The other end of the first spring sheet 211 is fixed to one end of the first spring sheet 212, the other end of the first spring sheet 212 is fixed with a first contact 213, a second contact 222 in contact with the first contact 213 is arranged beside the first contact 213, the second contact 222 is installed at one end of the second spring sheet 221, the other end of the second spring sheet 221 is installed on the inner wall of the shell through a mounting seat, when the elevator door is opened, the rotating hook 211 drives the first contact 213 away from the second contact 222, and when the elevator door is closed, the first contact 213 and the second contact 222 are tightly attached.

[0023] In order to design a driving mechanism 23 with a simple structure, the driving mechanism 23 includes: a first electromagnetic pushing component, which is used to push the first elastic sheet 212 to rotate away from the second elastic sheet 221 or push the second elastic sheet 221 to rotate away from the first elastic sheet 212. After the elevator door is closed, the first elastic sheet 212 and the second elastic sheet 221 can be pushed to force the first contact 213 and the second contact 222 that should be in close contact to separate from each other.

[0024] In order to design a first electromagnetic pushing component with a simple structure, the first electromagnetic pushing component includes: a main body 231, an electromagnet, a first spring, a permanent magnet and a push rod 232. The main body 231 is installed on the inner wall of the shell, and an electromagnet is arranged in the main body 231. A permanent magnet is arranged opposite to the electromagnet. The permanent magnet is fixed on the push rod 232. The push rod 232 moves under the guidance of the main body 231. The push rod 232 is used for separating the spring pieces and the rotating hook 211 that are in contact with each other after the electromagnet is energized. One end of the first spring is fixed to the push rod 232, and the other end of the first spring is fixed to the main body 231. When the electromagnet is not energized, the push rod 232 is kept away from the first spring 212 or the second spring 221 under the elastic force of the first spring. When the first electromagnetic pushing component pushes the first spring sheet 212 , the first electromagnetic pushing component is located on a side of the first spring sheet 212 close to the second spring sheet 221 ; when the first electromagnetic pushing component pushes the second spring sheet 221 , the first electromagnetic pushing component is located on a side of the second spring sheet 221 close to the first spring sheet 212 .

[0025] In order to prevent the push rod 232 from being damaged due to friction between the push rod 232 and the spring sheet due to deflection of the spring sheet relative to the push rod 232, a first rotatable roller 233 is mounted on the push rod 232, and the first roller 233 is used to contact the spring sheet.

[0026] When the elevator door is closed, the first contact part 21 and the second contact part 22 are driven to move closer to each other. After long-term use, dust and other impurities are inevitably present at the contact point of the first contact part 21 and the second contact part 22, which affects the normal connection between the first contact part 21 and the second contact part 22 after they move closer to each other. At this time, the operation of the driving mechanism 23 can be controlled to force the second elastic sheet 221 to move away from the rotating hook 211 when the second elastic sheet 221 tends to approach the rotating hook 211, so as to realize the elastic movement of the second elastic sheet 221. The entire driving mechanism 23 is located on the side of the second elastic sheet 221 away from the free end of the rotating hook 211. When the first contact part 21 and the second contact part 22 are performing the opening and closing functions normally, the first roller 233 does not hinder the movement of the first contact part 21 and the second contact part 22 under the elastic force of the first spring. When the closing function cannot be achieved due to poor contact between the first contact portion 21 and the second contact portion 22, the electromagnet is energized, and the electromagnet uses magnetic force to make the permanent magnet move away from the electromagnet, and then the permanent magnet drives the push rod 232 to move toward the second elastic piece 221, and the thrust of the first roller 233 forces the second elastic piece 221 to rotate, and the second elastic piece 221 moves away from the rotating hook 211. Then, the electromagnet is de-energized, and the first roller 233 moves away from the second elastic piece 221 under the elastic force of the first spring, and at the same time, the second elastic piece 221 rotates toward the rotating hook 211 under the elastic force of the second elastic piece 221 itself. The above process is repeated several times, so that the second elastic piece 221 bounces back and forth, and the second elastic piece 221 collides with the rotating hook 211 back and forth, so that the dust on the second elastic piece 221 and the rotating hook 211 is detached, so that the first contact portion 21 and the second contact portion 22 can be connected when the closing command is executed.

[0027] Embodiment 2:

[0028] like Figure 3 as well as Figure 4 As shown, the difference between this embodiment and embodiment 1 is that this embodiment only replaces the driving mechanism 23 on the basis of embodiment 1.

[0029] In order to design a driving mechanism 23 with a simple structure, the driving mechanism 23 includes: a rotating disk 231', a pushing block 232' and a motor 233'. The motor 233' is installed on the inner wall of the shell. The rotating disk 231' is fixed to the rotating shaft of the motor 233'. The pushing block 232' protrudes from the edge of the rotating disk 231'. When the pushing block 232' contacts the second elastic sheet 221 or the first elastic sheet 212, the second contact point that contacts each other is separated from the first contact point.

[0030] Embodiment 3:

[0031] like Figure 5 As shown, the difference between this embodiment and the first embodiment is that this embodiment is based on the first embodiment and the first contact portion 21, the second contact portion 22 and the driving mechanism 23 are modified.

[0032] The first contact part 21 is a socket, and the second contact part 22 is a plug. When the elevator door lock switch 2 is closed, the plug is inserted into the plug. The socket is used to connect the driving component 24" of the elevator door lock switch 2. The driving component 24" is used to drive the socket to move toward the plug when the elevator door is closed. The plug is connected to the driving mechanism 23.

[0033] In order to design the driving mechanism 23 with a simple structure, the driving mechanism 23 includes: a second electromagnetic pushing component, and the output portion of the second electromagnetic pushing component is fixed to the plug.

[0034] The first electromagnetic push assembly and the second electromagnetic push assembly have the same structure. The second electromagnetic push assembly does not have the second roller 255, and the push rod of the second electromagnetic push assembly is fixed to the plug. It is just that when the electromagnet is not energized, the plug is kept in a position close to the socket under the elastic force of the first spring. At this time, the opening and closing function of the elevator door lock switch 2 can be realized, and the driving assembly 24" can separate the socket and the plug when the elevator door is opened; and can also close the socket and the plug when the elevator is closed. When the electromagnet is energized, the plug closed with the socket can be moved away from the socket, and can be restored to the state of the socket and the plug being closed under the elastic force of the first spring.

[0035] Embodiment 4:

[0036] like Figures 6 to 8 As shown, the difference between this embodiment and embodiment 1 is that this embodiment only modifies the driving mechanism 23 based on embodiment 1.

[0037] The driving mechanism includes: a hanging ear 24, a connecting component 25 and a third electromagnetic pushing component. The third electromagnetic pushing component is arranged on the side of the second elastic piece 221 away from the free end of the rotating hook 211. The hanging ear 24 is connected to the second elastic piece 221. The hanging ear 24 and the second elastic piece 221 are integrally formed. A connecting component 25 is arranged between the hanging ear 24 and the third electromagnetic pushing component. When the rotating hook 211 is in a closed position, the third electromagnetic pushing component can be detachably connected to the hanging ear 24 through the connecting component 25.

[0038] The third electromagnetic pushing component has the same structure as the first electromagnetic pushing component. The third electromagnetic pushing component does not have the second roller 255. The push rod of the third electromagnetic pushing component is used to connect the connecting component 25. When the third electromagnetic pushing component is powered on, the push rod extends, and when the third electromagnetic pushing component is powered off, the push rod shortens.

[0039] In order to ensure that the third electromagnetic pushing component does not interfere with the movement of the second elastic sheet 221, and can also ensure that the third electromagnetic pushing component drives the second elastic sheet 221 away from the first elastic sheet 212 after the first contact 213 contacts the second contact 222, the connecting component 25 includes: a wedge block 250, a mounting block 251, a second spring 252, a slider 253, a mounting tube 254, a second roller 255, a hanging rod 256, a connecting block 257, a third spring 258, a bayonet 259 and a fourth spring 260. The push rod of the third electromagnetic pushing component is connected to the large end of the wedge block 250, and the small end of the wedge block 250 extends in a direction away from the third electromagnetic pushing component. A slide groove is provided between the third electromagnetic pushing component and the second elastic sheet 221, and a slidable slider 253 is installed in the slide groove. The slider 253 is connected to one end of the second spring 252, and the other end of the second spring 252 is fixed to the mounting block 251. The mounting block 251 The slider 253 is mounted on the inner wall of the housing. The elastic force of the second spring 252 can keep the slider 253 located at one end of the slide groove away from the third electromagnetic push component. A mounting cylinder 254 is mounted on the slider 253. The center line of the mounting cylinder 254 is parallel to the guide direction of the slide groove. A second roller 255 is arranged in the mounting cylinder 254. The second roller 255 is rotatably mounted on one end of a hanging rod 256. The other end of the hanging rod 256 extends into the top wall of the mounting cylinder 254. The end of the hanging rod 256 away from the second roller 255 can extend into the hanging ear 24. Inside, the hanging ear 24 is provided with a hanging hole for the hanging rod 256 to pass through. When the slider 253 is located in the sliding groove away from one end of the third electromagnetic pushing component, the hanging rod 256 is aligned with the hanging hole. A connecting block 257 is connected to the hanging rod 256, and the connecting block 257 is connected to one end of the third spring 258. The other end of the third spring 258 is installed on the top wall of the mounting tube 254. A telescopic hole is formed in the bottom wall of the mounting tube 254. A bayonet 259 is arranged in the telescopic hole. The mounting tube 254 can allow the wedge block 250 to extend into. The bottom surface of the wedge block 250 is recessed to form a hole for one end of the bayonet 259 to be inserted. The other end of the bayonet 259 is fixed to one end of the fourth spring 260. The other end of the fourth spring 260 is fixed to the inner wall of the telescopic hole. Under the elastic force of the fourth spring 260, the bayonet 259 can be kept inserted into the hole. The end of the bayonet 259 extending into the hole is hemispherical.

[0040] In order to prevent the third spring 258 from being damaged by suspending the hanging rod 256 for a long time, a suspension assembly 27 for suspending the hanging rod 256 is installed in the installation cylinder 254. The suspension assembly 27 includes: a central axis 271, a coil spring 272, a rotating cylinder 273 and a pull rope 274. A cavity is opened in the top wall of the installation cylinder 254, and the central axis 271 is installed in the cavity. The central axis 271 is located in the horizontal direction. A rotating cylinder 273 is surrounded by the central axis 271. The rotating cylinder 273 can rotate around the central axis 271. The spindle 271 rotates, and the rotating cylinder 273 is rotatably installed on the inner wall of the cavity. There is a distance between the rotating cylinder 273 and the central axis 271, and there is a distance between the rotating cylinder 273 and the inner wall of the cavity. A coil spring 272 is convoluted between the rotating cylinder 273 and the central axis 271, and the inner end of the coil spring 272 is fixed to the central axis 271, and the outer end of the coil spring 272 is fixed to the inner wall of the rotating cylinder 273. The inner end of the pull rope 274 is convoluted outside the rotating cylinder 273, and the outer end of the pull rope 274 is inserted into the installation cylinder 254 and fixed to the connecting block 257.

[0041] The working principle of this embodiment is as follows: when the third electromagnetic pushing component does not act on the second spring piece 221 and the first contact 213 is in contact with the second contact 222, the third electromagnetic pushing component is not energized, the wedge block 250 is kept close to the third electromagnetic pushing component, and the hanging rod 256 is kept aligned with the hanging hole on the hanging ear 24 under the elastic force of the second spring 252. The hanging rod 256 is retracted into the installation tube 254 under the elastic force of the third spring 258, the pull rope 274 is completely pulled out, and the coil spring 272 is deformed. After the first contact 213 and the second contact 222 are in contact, when the first contact 213 and the second contact 222 need to be separated, the third electromagnetic pushing component is energized, and the third electromagnetic pushing component pushes the wedge block 250 into the installation cylinder 254. The wedge block 250 squeezes the hanging rod 256 through the second roller 255, so that the hanging rod 256 is inserted into the hanging ear 24. At this time, the latch 259 is also inserted into the latch hole. Subsequently, the third electromagnetic pushing component retracts, so that the wedge block 250 drives the installation cylinder 254, the hanging rod 256, and the hanging ear 24 through the latch 259. And the second spring piece 221 moves toward the third electromagnetic pushing component, and the first contact point and the second contact point are separated. As the second spring piece 221 moves, the elastic potential energy of the second spring 252 becomes larger. When the first contact point and the second contact point are separated, the elastic potential energy of the second spring 252 is relatively large, forcing the latch 259 to separate from the latch hole. Finally, under the elastic force of the second spring 252, the wedge block 250 is separated from the latch 259, and the wedge block 250 releases the installation tube 254, the hanging rod 256 and the hanging ear 24. Finally, the wedge block 250 moves away from the installation tube 254, the hanging rod 256 is separated from the hanging ear 24, and the first contact point and the second contact point are contacted again under the elastic force of the second spring 252, and the installation tube 254 is reset under the elastic force of the second spring 252.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. An elevator door lock switch, characterized in that: include: A first contact part, a second contact part and a driving mechanism, the clutch of the first contact part and the second contact part corresponds to the opening and closing of the elevator door lock switch, a driving mechanism is installed next to the first contact part and the second contact part, the driving mechanism is used to act on the second contact part, when the elevator door lock switch is closed, the driving mechanism drives the first contact part and the second contact part to clutch, and the driving mechanism does not affect the normal opening and closing of the first contact part and the second contact part; The first contact part includes: a rotating hook, a first spring sheet and a first contact point, the second contact part includes: a second spring sheet and a second contact point, the first contact part and the second contact part are both arranged in a shell, one end of the rotating hook is rotatably mounted on the inner wall of the shell, the other end of the rotating hook is fixed to one end of the first spring sheet, the other end of the first spring sheet is fixed with the first contact point, a second contact point in contact with the first contact point is arranged beside the first contact point, the second contact point is mounted on one end of the second spring sheet, and the other end of the second spring sheet is mounted on the inner wall of the shell through a mounting seat, when the elevator door is opened, the rotating hook drives the first contact point away from the second contact point, and when the elevator door is closed, the first contact point is in close contact with the second contact point; The driving mechanism includes: a hanging ear, a connecting component and a third electromagnetic pushing component. The third electromagnetic pushing component is arranged on the side of the second spring sheet away from the free end of the rotating hook. The hanging ear is connected to the second spring sheet. The hanging ear and the second spring sheet are integrally formed. A connecting component is arranged between the hanging ear and the third electromagnetic pushing component. When the rotating hook is in the closed position, the third electromagnetic pushing component can be detachably connected to the hanging ear through the connecting component. The third electromagnetic push assembly includes: a body, an electromagnet, a first spring, a permanent magnet and a push rod. The body is installed on the inner wall of the shell, the electromagnet is arranged in the body, and the permanent magnet is arranged opposite to the electromagnet. The permanent magnet is fixed on the push rod. The push rod moves under the guidance of the body. When the electromagnet is energized, the first contact and the second contact that are in contact with each other can be separated. One end of the first spring is fixed to the push rod, and the other end of the first spring is fixed to the body. When the electromagnet is not energized, the push rod is kept away from the second spring sheet under the elastic force of the first spring. The push rod of the third electromagnetic pushing assembly is used to connect the connecting assembly; The connecting component includes: a wedge block, a mounting block, a second spring, a slider, a mounting cylinder, a second roller, a hanging rod, a connecting block, a third spring, a latch and a fourth spring. The push rod of the third electromagnetic pushing component is connected to the large end of the wedge block, and the small end of the wedge block extends in a direction away from the third electromagnetic pushing component. A slide groove is provided between the third electromagnetic pushing component and the second elastic sheet. A sliding slider is installed in the slide groove. The slider is connected to one end of the second spring, and the other end of the second spring is fixed to the mounting block. The mounting block is installed on the inner wall of the shell. The elastic force of the second spring can keep the slider in the slide groove away from one end of the third electromagnetic pushing component. A mounting cylinder is installed on the slider, and the center line of the mounting cylinder is parallel to the guide direction of the slide groove. A second roller is provided in the mounting cylinder, and the second roller can rotate The cam is provided with a hook at one end of the hook and a hook at the other end of the hook, and the hook is provided with a hook hole for the hook to pass through. When the slider is located in the slide groove away from the end of the third electromagnetic pushing component, the hook and the hook hole are aligned. A connecting block is connected to the hook, and the connecting block is connected to one end of the third spring. The other end of the third spring is installed on the top wall of the mounting tube, and a telescopic hole is formed in the bottom wall of the mounting tube. A bayonet is provided in the telescopic hole, and the mounting tube can allow the wedge block to extend into. The bottom surface of the wedge block is recessed to form a bayonet hole for inserting one end of the bayonet pin. The other end of the bayonet pin is fixed to one end of the fourth spring, and the other end of the fourth spring is fixed to the inner wall of the telescopic hole. The bayonet pin can be kept inserted into the bayonet hole under the elastic force of the fourth spring, and the end of the bayonet pin extending into the bayonet hole is hemispherical. A suspension assembly for suspending the hanging rod is installed in the installation tube.

2. An elevator door lock switch according to claim 1, characterized in that: The suspension assembly includes: a central axis, a coil spring, a rotating cylinder and a pull rope. A cavity is opened in the top wall of the installation cylinder, and the central axis is installed in the cavity. The central axis is located in the horizontal direction. A rotating cylinder is surrounded outside the central axis, and the rotating cylinder can rotate around the central axis. The rotating cylinder can be rotatably installed on the inner wall of the cavity. There is a distance between the rotating cylinder and the central axis, and there is a distance between the rotating cylinder and the inner wall of the cavity. A coil spring is convoluted between the rotating cylinder and the central axis, and the inner end of the coil spring is fixed to the central axis, and the outer end of the coil spring is fixed to the inner wall of the rotating cylinder. The inner end of the pull rope is convoluted outside the rotating cylinder, and the outer end of the pull rope is inserted into the installation cylinder and fixed to the connecting block.

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