Anti-pinch device for elevator door

Abstract

The utility model relates to the technical field of elevators, in particular to an anti-pinch device for an elevator door. An elevator door anti-pinch device comprises a lift car, and a lift car opening is formed in the front portion of the lift car. The first car door and the second car door are arranged on the car in a reciprocating sliding mode so as to close or open the car opening; the driving mechanism is used for driving the first compartment door and the second compartment door to slide in a reciprocating manner; the inserting part is arranged on the side, close to the second compartment door, of the first compartment door in a protruding mode; the inserting groove is formed in the side, close to the first compartment door, of the second compartment door, and the inserting groove can be matched with the inserting part in an inserting mode; and the detection mechanism comprises a first detection piece and a second detection piece, and when the first detection piece and the second detection piece are not in electrical contact, the elevator traction equipment stops starting. The utility model provides an elevator door anti-pinch device capable of detecting small articles.

Description

Technical Field

[0001] The present application relates to the technical field of elevators, and in particular to an anti-pinch device for elevator doors. Background Art

[0002] Elevators are a common form of transportation used in high-rise buildings. When closing, if there is a foreign object near the elevator door, the door can easily get caught in the foreign object or even someone, posing a safety hazard.

[0003] Prior art typically uses light curtains or mechanical touch panels to detect people or foreign objects blocking the elevator door as it closes. When a person or foreign object is detected blocking the elevator door, the door stops closing to prevent pinching. However, this method struggles to detect small objects like ropes. This can easily lead to ropes and other small objects becoming trapped between the elevator doors, causing them to close directly and carry the rope or other small object along with them. This can easily cause accidents and damage the elevator, impacting normal use. Utility Model Content

[0004] Based on this, it is necessary to provide an elevator door anti-pinch device that can detect small objects.

[0005] An elevator door anti-pinch device, comprising:

[0006] A car, with a car opening at the front of the car;

[0007] The first door and the second door are respectively arranged on the car and can slide back and forth to close or open the car door;

[0008] A driving mechanism for driving the first door and the second door to slide back and forth;

[0009] A plug-in portion, protrudingly provided on a side of the first door close to the second door;

[0010] A plug-in slot is provided on a side of the second door close to the first door, and the plug-in slot can be plugged into and matched with the plug-in portion;

[0011] The detection mechanism includes a first detection member and a second detection member, wherein the second detection member is arranged in the plug-in slot and is electrically connected to the elevator traction equipment; the first detection member can electrically contact the second detection member through the plug-in engagement of the plug-in portion with the plug-in slot and feedback to the elevator traction equipment; when the first detection member and the second detection member are not electrically in contact, the elevator traction equipment stops starting.

[0012] In one embodiment, the detection mechanism further includes a sliding member, and the first detection member is arranged on a side of the sliding member close to the second detection member; along the plug-in direction of the plug-in portion and the plug-in slot, the sliding member is movably arranged in the plug-in slot, and the plug-in portion can abut against the sliding member and push the sliding member to move in a direction close to the second detection member.

[0013] In one embodiment, the plug-in portion is a strip-shaped structure, extending along the height direction of the first door; the plug-in slot is a strip-shaped structure, extending along the height direction of the second door; and the sliding member is a strip-shaped structure, extending along the height direction of the plug-in slot.

[0014] In one embodiment, the second detecting member is provided with an open slot, and the first detecting member can be plugged into the open slot; when the first detecting member is inserted into the open slot, the first detecting member is in electrical contact with the second detecting member.

[0015] In one embodiment, the detection mechanism further includes a reset component connected to the sliding member, and the reset component is used to drive the sliding member to move in a direction away from the second detection member to reset.

[0016] In one embodiment, the reset component includes a fixed seat, a guide rod and an elastic member, the fixed seat and the guide rod are slidingly limited, one end of the guide rod is connected to the sliding member, and the other end is slidably passed through the fixed seat; the elastic member is sleeved on the outside of the guide rod, and one end abuts the sliding member, and the other end abuts the fixed seat.

[0017] In one embodiment, a cutting piece is provided on a side of the sliding member close to the first door, and the cutting piece is extended along a height direction of the sliding member.

[0018] In one embodiment, a cutting groove cooperating with the cutting member is provided on the plug-in portion, and the cutting groove extends along the height direction of the plug-in portion.

[0019] In one embodiment, the driving mechanism includes a guide rail and a linear driving member, the guide rail is provided on the car, and the linear driving member slides with the guide rail; the linear driving member is provided in at least two groups, and the two groups of linear driving members are respectively connected to the first car door and the second car door.

[0020] In one embodiment, the reset component is provided in at least two groups, and the two groups of reset components are distributed along the height direction of the sliding component; the first detection component and the second detection component are located between the two groups of reset components; an extension rod is provided on the sliding component, one end of the extension rod is connected to the sliding component, and the other end is connected to the first detection component, and is extended toward the direction of the second detection component.

[0021] Compared to existing technologies, the elevator door anti-pinch device is equipped with a plug-in portion and a plug-in slot, which utilize the plug-in engagement of the plug-in portion and the plug-in slot to achieve electrical contact between the first and second detection members. When a small object such as a rope is present when the door is closed, the thickness of the object will prevent the plug-in portion from being inserted or fully inserted into the plug-in slot. As a result, the first and second detection members will be out of electrical contact, the elevator traction equipment will stop starting, and the elevator will not move up or down. This effectively prevents the elevator from continuing to operate when a rope or small object is pinched, effectively avoiding accidents and ensuring the safety of passengers. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the following briefly introduces the drawings required for use in the embodiments or the conventional technology descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 This is a schematic structural diagram of the elevator door anti-pinch device provided in this application.

[0024] Figure 2 This is a schematic structural diagram of the first compartment door provided in this application.

[0025] Figure 3 This is a schematic structural diagram of the second compartment door provided in this application.

[0026] Figure 4 for Figure 3 Enlarged view of point A in the middle.

[0027] Figure numerals: 1. Car; 11. Car entrance; 10. First car door; 20. Second car door; 3. Driving mechanism; 31. Guide rail; 32. Linear driving member; 41. Connecting part; 42. Connecting slot; 5. Detection mechanism; 51. First detection member; 52. Second detection member; 53. Opening slot; 54. Sliding member; 6. Resetting member; 61. Fixed seat; 62. Guide rod; 63. Elastic member; 7. Extension rod; 81. Cutting member; 82. Cutting slot. DETAILED DESCRIPTION

[0028] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0029] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0031] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it can mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it can mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is higher in level than the second feature. When a first feature is "below," "below," or "below" a second feature, it can mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is lower in level than the second feature.

[0032] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more of the relevant listed items.

[0033] See also Figures 1 to 4The present application provides an elevator door anti-pinch device, comprising a car 1, a first car door 10, a second car door 20, a driving mechanism 3, a plug-in portion 41, a plug-in slot 42 and a detection mechanism 5. A car opening 11 is provided at the front of the car 1. The first car door 10 and the second car door 20 are respectively arranged on the car 1 to slide back and forth to close or open the car opening 11. The driving mechanism 3 is used to drive the first car door 10 and the second car door 20 to slide back and forth. The plug-in portion 41 is protrudingly arranged on the side of the first car door 10 close to the second car door 20. The plug-in slot 42 is arranged on the side of the second car door 20 close to the first car door 10, and the plug-in slot 42 can be plugged into and matched with the plug-in portion 41. The detection mechanism 5 includes a first detection member 51 and a second detection member 52. The second detection member 52 is arranged in the plug-in slot 42 and is electrically connected to the elevator traction equipment. The first detection member 51 can be electrically connected to the second detection member 52 by the plug-in connection between the plug-in portion 41 and the plug-in slot 42 and fed back to the elevator traction device. When the first detection member 51 and the second detection member 52 are not electrically connected, the elevator traction device stops starting.

[0034] Understandably, when the car opening 11 is closed, the first door 10 and the second door 20 slide toward the side closer to each other. When the first door 10 and the second door 20 move to the side closer to each other and fit together, the car opening 11 is closed. At this time, the plug-in portion 41 and the plug-in slot 42 also plug and match each other, so that the first detection member 51 and the second detection member 52 are in electrical contact, and feedback is fed back to the elevator traction device, and the elevator traction device starts normally, driving the elevator to move up and down. However, when there is a rope or small object, due to the obstruction of the rope or small object, the side of the first door 10 and the second door 20 that is close to each other will be separated by a certain distance, so that the distance between the plug-in portion 41 and the plug-in slot 42 is reduced, and the first detection member 51 and the second detection member 52 are also separated by a certain distance, and cannot electrically contact. At this time, the elevator traction device will stop starting and will not pull the elevator to move up and down, thereby effectively preventing the elevator from continuing to operate when a rope or small object is caught, effectively avoiding the occurrence of accidents and ensuring the safety of passengers.

[0035] Secondly, the plug-in portion 41 and the plug-in slot 42 need to be plugged in. Compared with the method of directly setting the first detection member 51 and the second detection member 52 on the side wall of the compartment door, the plug-in is more susceptible to the influence of foreign matter. When the object has a certain length, the distance that the plug-in portion 41 cannot be inserted into the plug-in slot 42 can be enlarged, which makes it easier to prevent the electrical contact between the first detection member 51 and the second detection member 52, and the anti-pinch feedback effect is better.

[0036] In one embodiment, the detection mechanism 5 further includes a sliding member 54. The sliding member 54 is movably disposed within the insertion slot 42 along the insertion direction of the insertion portion 41 and the insertion slot 42. The insertion portion 41 can abut against the sliding member 54 and push the sliding member 54 toward the second detection member 52. The first detection member 51 is disposed on a side of the sliding member 54 that is adjacent to the second detection member 52.

[0037] It can be understood that after the plug-in portion 41 is inserted into the plug-in slot 42, the sliding member 54 is pushed to move toward the direction close to the second detection member 52. When the first door 10 and the second door 20 are close to each other and fit together on one side, the sliding member 54 is pushed to the position of the second detection member 52, and the first detection member 51 is electrically contacted with the second detection member 52.

[0038] In this way, the first detection member 51 and the second detection member 52 are both arranged in the plug-in slot 42, which effectively avoids the first detection member 51 and the second detection member 52 being directly exposed to the outside, reduces the possibility of damage, and improves the service life of the elevator.

[0039] For example, the insertion portion 41 is a strip-shaped structure extending along the height of the first door 10. The insertion slot 42 is a strip-shaped structure extending along the height of the second door 20. The sliding member 54 is a strip-shaped structure extending along the height of the insertion slot 42. This ensures that feedback is provided for foreign objects caught anywhere along the height of the doors, improving detection accuracy.

[0040] Exemplarily, the plug-in slot 42 is provided on the back of the second door 20. The plug-in slot 42 is formed by vertically cutting from the back of the second door 20 toward the front to form a groove structure, and the plug-in slot 42 is opened on the side close to the first door to facilitate the insertion of the plug-in part 41.

[0041] Preferably, the length of the plug part 41 is set to be greater than the length of the car opening 11, and the length of the plug slot 42 and the sliding member 54 is equal to the length of the plug part 41. This further ensures that any foreign object caught at any position of the car opening 11 can be fed back.

[0042] For example, the plug-in portion 41 is a strip-shaped protrusion protruding from the side wall of the first door 10 , and can be provided on the first door 10 by welding or integral molding.

[0043] Exemplarily, the sliding member 54 is an elongated plate-like structure, the length and width of which are slightly smaller than the slot opening of the plug-in slot 42 so as to move smoothly in the plug-in slot 42 .

[0044] In one embodiment, the second detecting member 52 is provided with an opening slot 53, and the first detecting member 51 can be plugged into the opening slot 53. When the first detecting member 51 is inserted into the opening slot 53, the first detecting member 51 and the second detecting member 52 are in electrical contact.

[0045] Understandably, only when the first door 10 and the second door 20 are in contact with each other on their adjacent sides and the plug-in portion 41 is fully inserted into the plug-in slot 42 can the plug-in portion 41 push the sliding member 54 into position, and then the sliding member 54 drives the first detection member 51 to be inserted into the opening slot 53, thereby achieving electrical contact with the second detection member 52. If any of the above actions are not achieved, the first detection member 51 cannot be inserted into the opening slot 53, that is, electrical contact cannot occur, and the elevator cannot start. This further improves the accuracy of foreign object entrapment detection and enhances safety performance.

[0046] Exemplarily, the first detection member 51 is an electrode sheet, and the second detection member 52 is an electrode ring.

[0047] In one embodiment, the detection mechanism 5 further includes a reset member 6 connected to the slider 54. The reset member 6 is configured to drive the slider 54 to reset in a direction away from the second detection member 52. When the car opening 11 is opened, the first door 10 and the second door 20 move away from each other, the plug-in portion 41 also moves away from the plug-in slot 42, and the interfering thrust acting on the slider 54 disappears. At this point, the reset member 6 can automatically drive the slider 54 to reset to its initial state, preparing for the next detection.

[0048] Furthermore, the reset component 6 includes a fixed seat 61, a guide rod 62, and an elastic member 63. The fixed seat 61 and the guide rod 62 are engaged in a limited position. One end of the guide rod 62 is connected to the sliding member 54, and the other end is slidably inserted into the fixed seat 61. The fixed seat 61 is engaged in a limited position with the end of the guide rod 62 away from the elastic member 63 to prevent the fixed seat 61 from falling off. The elastic member 63 is sleeved on the guide rod 62, with one end abutting the sliding member 54 and the other end abutting the fixed seat 61.

[0049] For example, the reset member 6 is positioned behind the slider 54 and in front of the second detection member 52 along the direction of movement of the slider 54. A fixing seat 61 is fixed to the inner wall of the insertion slot 42 located behind the slider 54. As the slider 54 moves backward, the distance between the slider 54 and the fixing seat 61 decreases, compressing the elastic member 63 to store energy. When the pressure on the slider 54 disappears, the elastic member 63 drives the slider 54 to reset.

[0050] Secondly, the cooperation between the guide rod 62 and the fixed seat 61 provides guidance for the movement of the sliding member 54, preventing the sliding member 54 from tilting and position shifting, ensuring that the first detection member 51 and the second detection member 52 can be normally plugged in, and avoiding misjudgment.

[0051] For example, the elastic member 63 may be a spring, a spring sheet, rubber, etc.

[0052] Preferably, at least two groups of reset components 6 are provided, and the two groups of reset components 6 are distributed along the height direction of the slider 54. The first detection member 51 and the second detection member 52 are located between the two groups of reset components 6. That is, the two groups of reset components 6 are respectively arranged above and below the first detection member 51 and the second detection member 52, which provide better positioning and guidance, and make the movement of the slider 54 more stable.

[0053] Furthermore, an extension rod 7 is provided on the sliding member 54 . One end of the extension rod 7 is connected to the sliding member 54 , and the other end is connected to the first detecting member 51 , and is extended toward the second detecting member 52 .

[0054] Understandably, due to the presence of the reset component 6, the distance between the first detection member 51 and the second detection member 52 is relatively far, and the extension rod 7 is used to shorten the distance between the two to avoid the situation where the first detection member 51 and the second detection member 52 still cannot be plugged in after the sliding member 54 moves to the maximum position.

[0055] In one embodiment, a cutting member 81 is provided on the sliding member 54 . The cutting member 81 is provided on a side of the sliding member 54 close to the first door 10 and extends along the height direction of the sliding member 54 .

[0056] It is understandable that when there is a foreign object such as a rope between the connecting portion 41 and the connecting groove 42, the foreign object will be squeezed onto the cutting piece 81. During the closing process of the first door 10 and the second door 20, the connecting portion 41 will continue to squeeze the foreign object, driving the rope and other foreign objects to squeeze the cutting piece 81, so that the cutting piece 81 cuts off the rope and other foreign objects, thereby preventing the rope from being pulled and causing danger.

[0057] Exemplarily, the cutting member 81 is a blade, with the blade edge facing the opening of the insertion slot 42 .

[0058] Furthermore, the inserting portion 41 is provided with a cutting groove 82, which extends along the height direction of the inserting portion 41. The cutting groove 82 is capable of cooperating with the cutting member 81, that is, the cutting member 81 can be snapped into the cutting groove 82, making it easier to cut foreign matter. Preferably, the length of the cutting groove 82 is adapted to the length of the cutting member 81.

[0059] In one embodiment, the drive mechanism 3 includes a guide rail 31 and a linear actuator 32. The guide rail 31 is provided on the car 1, and the linear actuator 32 slidably engages with the guide rail 31. The linear actuator 32 is provided in at least two sets, each connected to the first door 10 and the second door 20. The guide rail 31 extends across both doors, from the first door 10 to the second door 20.

[0060] For example, the linear drive 32 is a linear motor, electrically connected to a battery mounted on the elevator car 1 and controlled by a control switch. When powered, the linear drive 32 moves linearly along the guide rail 31, thereby driving the first and second doors 10, 20. The principles of motion of the linear motor and the control switch are known in the art and will not be elaborated upon.

[0061] For example, the front portion of the linear drive member 32 is fixedly mounted to the rear portions of the first door 10 and the second door 20 via a connecting block.

[0062] Exemplarily, the driving mechanisms 3 are provided in at least two groups, and the two groups of driving mechanisms 3 are respectively provided at the upper part and the bottom part of the car 1, and work together to drive the car door to move.

[0063] During use, passengers enter the elevator car 1 and control the left and right linear drive members 32 to move toward the middle. The two linear drive members 32 will drive the first car door 10 and the second car door 20 to move toward the middle, so that the two elevator car doors are merged. The plug-in part 41 is inserted into the plug-in slot 42, and the plug-in part 41 pushes the sliding member 54 to move, so that the first detection member 51 is inserted into the second detection member 52, so that the two are energized and feedback is given to the traction device. The traction device in the elevator shaft starts normally and drives the elevator car 1 to move.

[0064] If a rope or small object appears between the two first doors 10 and the second door 20 and is not detected by the scanner, the rope or small object will be squeezed on the plug-in slot 42 before the plug-in part 41 is inserted into the plug-in slot 42, causing the plug-in part 41 to be unable to be fully inserted into the plug-in slot 42, thereby making it impossible for the plug-in part 41 to push the sliding member 54 to move to the previous distance, so that the first detection member 51 on the sliding member 54 cannot be inserted into the second detection member 52. The two detection members are not in contact, and the traction equipment in the elevator shaft cannot be triggered to start normally, and the elevator car 1 will not be driven to move.

[0065] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0066] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of patent protection for the present application shall be determined by the appended claims.

Claims

1. An elevator door anti-pinch device, characterized in that: include: A car (1), wherein a car opening (11) is provided at the front of the car (1); A first door (10) and a second door (20) are respectively arranged on the car (1) in a reciprocatingly slidable manner to close or open the car opening (11); A driving mechanism (3) for driving the first compartment door (10) and the second compartment door (20) to slide back and forth; A plug-in portion (41) is protrudingly provided on a side of the first door (10) close to the second door (20); A plug-in slot (42) is provided on a side of the second compartment door (20) close to the first compartment door (10), and the plug-in slot (42) can be plugged and matched with the plug-in portion (41); The detection mechanism (5) comprises a first detection member (51) and a second detection member (52), wherein the second detection member (52) is arranged in the plug-in slot (42) and is electrically connected to the elevator traction device; the first detection member (51) can electrically contact the second detection member (52) through the plug-in fit between the plug-in portion (41) and the plug-in slot (42) and feedback to the elevator traction device; when the first detection member (51) and the second detection member (52) are not electrically contacted, the elevator traction device stops starting.

2. The elevator door anti-pinch device according to claim 1, characterized in that: The detection mechanism (5) further comprises a sliding member (54), wherein the first detection member (51) is arranged on a side of the sliding member (54) close to the second detection member (52); along the plugging direction of the plug-in portion (41) and the plug-in slot (42), the sliding member (54) is movably arranged in the plug-in slot (42), and the plug-in portion (41) can abut against the sliding member (54) and push the sliding member (54) to move in a direction close to the second detection member (52).

3. The elevator door anti-pinch device according to claim 2, characterized in that: The plug-in portion (41) is a strip-shaped structure, extending along the height direction of the first compartment door (10); the plug-in slot (42) is a strip-shaped structure, extending along the height direction of the second compartment door (20); and the sliding member (54) is a strip-shaped structure, extending along the height direction of the plug-in slot (42).

4. The elevator door anti-pinch device according to claim 1, characterized in that: The second detection member (52) is provided with an opening slot (53), and the first detection member (51) can be plugged into the opening slot (53); when the first detection member (51) is inserted into the opening slot (53), the first detection member (51) is in electrical contact with the second detection member (52).

5. The elevator door anti-pinch device according to claim 2, characterized in that: The detection mechanism (5) further comprises a reset component (6) connected to the sliding member (54), wherein the reset component (6) is used to drive the sliding member (54) to move and reset in a direction away from the second detection member (52).

6. The elevator door anti-pinch device according to claim 5, characterized in that: The reset component (6) comprises a fixed seat (61), a guide rod (62) and an elastic member (63); the fixed seat (61) and the guide rod (62) are slidably limited and matched; one end of the guide rod (62) is connected to the sliding member (54), and the other end is slidably arranged on the fixed seat (61); the elastic member (63) is sleeved outside the guide rod (62), and one end abuts against the sliding member (54), and the other end abuts against the fixed seat (61).

7. The elevator door anti-pinch device according to claim 2, characterized in that: A cutting piece (81) is provided on a side of the sliding piece (54) close to the first compartment door (10), and the cutting piece (81) is extended along the height direction of the sliding piece (54).

8. The elevator door anti-pinch device according to claim 7, characterized in that: The plug-in portion (41) is provided with a cutting groove (82) that matches the cutting piece (81), and the cutting groove (82) is extended along the height direction of the plug-in portion (41).

9. The elevator door anti-pinch device according to claim 1, characterized in that: The driving mechanism (3) comprises a guide rail (31) and a linear driving member (32), wherein the guide rail (31) is provided on the car (1), and the linear driving member (32) is slidably matched with the guide rail (31); the linear driving member (32) is provided in at least two groups, and the two groups of the linear driving members (32) are respectively connected to the first car door (10) and the second car door (20).

10. The elevator door anti-pinch device according to claim 5, characterized in that: The reset components (6) are provided in at least two groups, and the two groups of reset components (6) are distributed along the height direction of the sliding member (54); the first detection member (51) and the second detection member (52) are located between the two groups of reset components (6); an extension rod (7) is provided on the sliding member (54), one end of the extension rod (7) is connected to the sliding member (54), and the other end is connected to the first detection member (51), and is extended toward the second detection member (52).

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