Gate valve provided with an auxiliary locking structure

Abstract

The utility model discloses a gate valve with auxiliary locking structure relates to the field of gate valve, the inside of gate valve body is installed and reserves the closed valve spare, and the opening and closing control processing is carried out through the reserve closed valve spare, the inside of reserve closed valve spare is nested and is installed the nested reservation spare, and the outside fixed connection of nested reservation spare has the first spring. This gate valve with auxiliary locking structure is provided with self -adaptation locking structure, and the reserve closed valve spare of closed state is carried out auxiliary self -locking processing through self -adaptation locking structure, realizes the locking processing between gate valve body, realizes the locking closed processing of self -adaptation while the long -term bearing high -strength shunt waterway impact, will not cause the gate valve to exist influence because of the liquid flow too big and lead to its closed nature, prevent the phenomenon such as leakage, make the valve according to the pressure change and carry out the self -warning type protection operation, avoid the damage that appears after the subsequent user delayed reaction can not be retrieved.

Description

Technical Field

[0001] This invention relates to the field of gate valve technology, specifically to a gate valve equipped with an auxiliary locking structure. Background Technology

[0002] A gate valve is a valve that controls the flow of fluid by the vertical movement of a gate. Its core feature is that the movement direction of the opening and closing element is perpendicular to the direction of the fluid. It is usually only used in the fully open or fully closed state and cannot be used to regulate flow or throttle. For example, the patent with publication number CN120701811B discloses a gate valve control method and a gate valve. The gate valve includes: a valve body having a conveying channel; a valve plate partially located within the conveying channel and movably mounted on the valve body; a drive device mounted on the valve body, with its power output end connected to the valve plate; a flow acquisition device located within the conveying channel and mounted on the valve body; and an impurity detection device located within the conveying channel and near its input end, and mounted on the valve body. The drive device is used to drive the valve plate to cut off or not cut off the conveying channel, the flow acquisition device is used to acquire the flow rate within the conveying channel, and the impurity detection device is used to detect impurities at the input end of the conveying channel. This gate valve control method and gate valve can improve the unreasonable water supply caused by fluctuations in water demand from water users in a water supply network. For example, patent CN205226610U describes a gate valve, belonging to the field of valve technology, which solves the problem that the opening and closing status of current gate valves is not intuitive. This gate valve includes a cylindrical valve body with an inlet and an outlet at its two ends. The valve body also contains a rod-shaped valve stem and a valve core for opening and closing the water passage between the inlet and outlet. The valve core is axially fixed within the valve body, and the valve stem is also axially fixed. The valve core and valve stem are coaxially arranged, with the lower end of the valve stem threadedly connected to the valve core. The upper end of the valve stem extends out of the valve body, and a handle is fixed to the upper end of the valve stem. Due to the interaction between the indicator and the handle, the opening and closing status of the gate valve can be clearly understood. For example, patent CN121368694A discloses a gate valve monitor. In a broad form, the gate valve monitor includes an actuator housed within a housing, which may be a valve body or a separate component. The gate valve monitor includes one or more switches and actuators housed within the housing, the size of which is designed to allow passage of the gate valve stem. The actuator operates by movement of the gate valve stem to trigger the one or more switches. The patent also describes a gate valve including a gate valve monitor, a method for monitoring a gate valve, a method for manufacturing a gate valve monitor, and a kit for monitoring a gate valve. Most of the existing technologies mentioned above improve the overall structure. However, when existing gate valves are in operation and the water flow is closed, if the impact intensity of the diversion water path is too high over a long period of time, it will affect the sealing performance of the gate valve. In severe cases, leakage may even occur. Traditional valves cannot adapt to changes in pressure and strengthen protection in a timely manner, thus having certain limitations in use. Summary of the Invention

[0003] The purpose of this invention is to provide a gate valve with an auxiliary locking structure to solve the problem mentioned in the background art that when water flow is closed, if the impact intensity of the long-term diversion water path is too large, it will affect the sealing performance of the gate valve, and in severe cases, even leakage will occur. Traditional valves cannot adapt and strengthen protection in a timely manner according to changes in pressure.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a gate valve with an auxiliary locking structure, comprising a gate valve body, wherein a reserved closing valve component is installed on the inner side of the gate valve body, and the opening and closing control is performed through the reserved closing valve component; a nested reserved part is nested on the inner side of the reserved closing valve component, and a first spring is fixedly connected to the outer side of the nested reserved part, and the first spring is mutually connected to the outer side of the reserved closing valve component; a limit locking part is nested on the inner wall of the side of the reserved closing valve component, and the position of the limit locking part corresponds to that of the inner wall of the gate valve body; an adaptive locking structure is provided between the gate valve body and the reserved closing valve component, and the reserved closing valve component in the closed state is subjected to auxiliary protection self-locking treatment through the adaptive locking structure.

[0005] Furthermore, the adaptive locking structure is provided with a built-in liquid-bearing bladder component, which is nested and connected to the inner side of the reserved sealing valve component. The built-in liquid-bearing bladder component and the inner side of the nested reserved component are nested and connected. The inner wall of the reserved sealing valve component is bonded and connected to a corrugated liquid-bearing bladder, and the outer side of the corrugated liquid-bearing bladder is connected to a supply hose. The supply hose passes through the inner side of the reserved sealing valve component, and the supply hose and the built-in liquid-bearing bladder component are connected to each other.

[0006] Furthermore, the outer side of the corrugated liquid-bearing bladder is connected to the limiting locking member, and the inner wall of the gate valve body is nested with an internal bearing member, the internal bearing member and the limiting locking member being positioned corresponding to each other.

[0007] Furthermore, when the nested pre-reserved component comes into contact with the fluid driving force, it moves along the inner side of the pre-reserved closed valve component, and the nested pre-reserved component applies pressure to the outer side of the built-in bearing liquid bladder component. The built-in bearing liquid bladder component supplies fluid to the inside of the corrugated bearing liquid bladder through the supply hose. The corrugated bearing liquid bladder pushes the outer limit locking component to move laterally to the inner wall of the gate valve body for locking.

[0008] Furthermore, a guiding and protective structure is provided between the gate valve body and the reserved closed valve component, which provides a secondary guarantee for the protection stability of the reserved closed valve component; the guiding and protective structure is provided with a secondary locking component, which is nested along the inner wall of the gate valve body, and a connecting steel rope component is connected between the secondary locking component and the built-in bearing component, which passes through the inner side of the gate valve body.

[0009] Furthermore, a second spring is fixedly connected to the outer side of the secondary locking component, and the second spring is mated with the inner side of the gate valve body. A reserved internal groove is provided on the outer side of the reserved sealing valve component, and the reserved internal groove and the secondary locking component are positioned corresponding to each other.

[0010] Furthermore, an elastic diaphragm is provided inside the middle of the reserved sealing valve component, and the inner side of the elastic diaphragm is connected to the first liquid bladder component, which is located inside the reserved sealing valve component. The inner side of the limiting locking member is connected to the second liquid bladder component, and a flexible connecting pipe is connected between the second liquid bladder component and the first liquid bladder component. The outer side of the second liquid bladder component is connected to the first contact switch. A buzzer component is installed inside the built-in carrier component, and the outer side of the buzzer component is connected to the second contact switch. The positions of the second contact switch and the first contact switch correspond to each other.

[0011] Furthermore, when the outer side of the limiting locking member moves to contact the built-in support member, the built-in support member moves along the inner side of the gate valve body, and the built-in support member drives the secondary locking member to form a traction movement structure through the docking steel rope component.

[0012] Furthermore, during the continuous inward movement of the nested pre-reserved component under pressure, pressure is applied to the elastic diaphragm sheet in contact with the inner side. The elastic diaphragm sheet deforms inward to bear negative pressure on the first liquid bladder component, and the first liquid bladder component supplies the second liquid bladder component through the flexible connecting pipe. The second liquid bladder component pushes the first contact switch on the outer side to perform secondary movement with the displacement of the limit locking component until the first contact switch and the second contact switch make contact and form an electrical connection.

[0013] Compared with the prior art, the beneficial effects of the present invention are: This gate valve, equipped with an auxiliary locking structure, features an adaptive locking mechanism. This mechanism provides auxiliary self-locking for the pre-sealed valve components in the closed state. As the liquid flow rate transmitted through the diversion pipeline increases, the nested pre-contacting component, which is in contact with the liquid flow force, is pressurized and moves along the inner side of the pre-sealed valve component. This pressure simultaneously applies pressure to the inner-contact built-in load-bearing bladder component, allowing the built-in load-bearing bladder component to simultaneously supply fluid to the corrugated load-bearing bladder via the supply hose. The expanding corrugated load-bearing bladder then pushes the outer limiting locking component laterally, achieving locking with the gate valve body. This adaptive locking and sealing mechanism ensures that the gate valve's sealing performance is not compromised by excessive liquid flow, preventing leakage and allowing the valve to adapt to pressure changes and enhance its protective operation. Furthermore, a guiding protection structure is provided to provide secondary protection stability for the reserved closed valve component. As the limit locking component is subjected to force and moves into the interior of the gate valve body for locking, the built-in bearing component on its outer side will move along the interior of the gate valve body under force. The built-in bearing component will work with the outer docking steel rope component to drive the secondary locking component to form a synchronous traction movement, allowing the secondary locking component to move to the inner side of the reserved closed valve component for lateral locking. Thus, according to the intensity of water flow impact, the limit locking component and the secondary locking component achieve a double locking protection effect between the gate valve body and the reserved closed valve component, ensuring the sealing stability during high-pressure bearing process. Furthermore, as the impact force of the diverted liquid reaches a level requiring warning, the continuously pressurized nested pre-installed component will continuously move inward along the inner side of the pre-installed closed valve component until it applies pressure to the elastic diaphragm sheet in contact with the inner side. This, combined with the deformation of the elastic diaphragm sheet, creates negative pressure on the first liquid bladder component, allowing it to supply water to the second liquid bladder component through the flexible connecting pipe. The expanding and deformed second liquid bladder component will then push the outer first contact switch outward. Simultaneously, it will move outward a second time while being locked by the displacement of the limit locking component, until the first and second contact switches make contact and form an electrical connection. This triggers an alarm via the buzzer component, alerting the user to divert and depressurize the diverted water flow, preventing valve damage and improving safety. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional structural diagram of the gate valve body of the present invention; Figure 3 This is a schematic diagram of a semi-sectional three-dimensional structure of the reserved sealing valve component of the present invention; Figure 4 For the present invention Figure 3 A magnified schematic diagram of the central part of the structure; Figure 5 This is a schematic diagram of the half-section three-dimensional structure of the nested reserved component of the present invention; Figure 6 This is a half-section three-dimensional structural diagram of the built-in liquid-bearing bladder component of the present invention; Figure 7 This is a schematic diagram of the three-dimensional structure of the flexible butt joint pipe of the present invention; Figure 8 This is a three-dimensional structural diagram of the built-in support component of the present invention; Figure 9 This is a schematic diagram of the three-dimensional structure of the flexible hose supplied by the present invention; Figure 10 This is a three-dimensional structural diagram showing the connection between the reserved sealing valve component and the handle in this invention.

[0015] In the diagram: 1. Gate valve body; 2. Reserved closing valve component; 3. Nested reserved component; 4. First spring; 5. Built-in load-bearing liquid bladder component; 6. Supply hose; 7. Corrugated load-bearing liquid bladder; 8. Limit locking component; 9. Built-in load-bearing component; 10. Connecting steel rope component; 11. Secondary locking component; 12. Second spring; 13. Reserved built-in groove; 14. Elastic diaphragm; 15. First liquid bladder component; 16. Flexible connecting pipe; 17. Second liquid bladder component; 18. First contact switch; 19. Buzzer component; 20. Second contact switch. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] Example 1: Please refer to Figures 1-10The present invention provides the following technical solution: a gate valve with an auxiliary locking structure. To address the problem that when water flow is closed, if the impact intensity of the long-term diversion water path is too high, the sealing performance of the gate valve may be affected, and in severe cases, leakage may occur. Traditional valves cannot adapt to changes in pressure and provide timely enhanced protection. The invention discloses the following: a reserved closing valve component 2 is installed inside the gate valve body 1 for opening and closing control; a nested reserved component 3 is nested inside the reserved closing valve component 2, and a first spring 4 is fixedly connected to the outside of the nested reserved component 3, with the first spring 4 abutting against the outside of the reserved closing valve component 2; a limit locking component 8 is nested on the inner wall of the side of the reserved closing valve component 2, with the limit locking component 8 corresponding to the inner wall of the gate valve body 1; and an adaptive locking structure is provided between the gate valve body 1 and the reserved closing valve component 2, providing auxiliary protection and self-locking for the reserved closing valve component 2 in the closed state.

[0018] The adaptive locking structure includes a built-in liquid-bearing bladder component 5, which is nested and connected to the inner side of the reserved closing valve component 2. The built-in liquid-bearing bladder component 5 and the inner side of the nested reserved component 3 are also nested and connected. A corrugated liquid-bearing bladder 7 is bonded to the inner wall of the reserved closing valve component 2, and a supply hose 6 is connected to the outer side of the corrugated liquid-bearing bladder 7. The supply hose 6 passes through the inner side of the reserved closing valve component 2 and is connected to the built-in liquid-bearing bladder component 5. The outer side of the corrugated liquid-bearing bladder 7 is connected to the limiting locking component 8. A built-in bearing component 9 is nested and installed on the inner wall of the gate valve body 1. The positions of the built-in bearing component 9 and the limiting locking component 8 correspond to each other. When the equipment needs to be closed during operation, it only needs to be closed according to… Figure 1As shown, rotating the handle at the upper end of the gate valve body 1 causes the threaded rod at the upper end of the handle to drive the reserved sealing valve component 2 to rotate synchronously. The lower end of the handle has a rectangular structure, which drives the reserved sealing valve component 2 to rotate along the interior of the gate valve body 1 without displacement. That is, the upper half of the threaded handle moves up and down through thread self-locking, while the lower half of the handle drives the reserved sealing valve component 2 to rotate along the lower end of the gate valve body 1 until the reserved sealing valve component 2 is fitted and sealed along the inner wall of the gate valve body 1. When the reserved sealing valve component 2 comes into contact with the impact force of the high-pressure water flow, the nested reserved part 3 moves along the inner side of the reserved sealing valve component 2 when it comes into contact with the fluid driving force. The nested reserved part 3 also applies pressure to the outer side of the built-in carrying liquid bladder component 5, and the built-in carrying liquid bladder component 5 supplies fluid to the corrugated carrying liquid bladder 7 through the supply hose 6. During operation, the corrugated load-bearing liquid bladder 7 pushes the outer limiting locking member 8 to move laterally to the inner wall of the gate valve body 1 for locking. The liquid flow rate transmitted by the diversion pipeline increases, and the nested reserved member 3, which is in contact with the liquid flow force, will be pressurized and move along the inner side of the reserved closing valve component 2, so that it simultaneously applies pressure to the inner contact of the built-in load-bearing liquid bladder component 5, and allows the built-in load-bearing liquid bladder component 5 to be supplied to the inside of the corrugated load-bearing liquid bladder 7 through the supply hose 6. Thus, the expanded corrugated load-bearing liquid bladder 7 pushes the outer limiting locking member 8 to move laterally, realizing the locking treatment between it and the gate valve body 1. While bearing the high-intensity diversion water impact for a long time, it achieves adaptive locking and sealing treatment, which will not cause the gate valve to be affected by excessive liquid flow, thus preventing leakage and other phenomena. It allows the valve to adaptively strengthen protection operation according to the pressure change.

[0019] Example 2: Based on Example 1, a guide protection structure is also disclosed, the specific structure of which is as follows: A guiding and protective structure is provided between the gate valve body 1 and the reserved closing valve component 2, which provides a secondary guarantee for the protection stability of the reserved closing valve component 2. The guiding and protective structure is equipped with a secondary locking component 11, which is nested along the inner wall of the gate valve body 1. A connecting steel rope component 10 is connected between the secondary locking component 11 and the built-in bearing component 9, and the connecting steel rope component 10 passes through the inner side of the gate valve body 1. A second spring 12 is fixedly connected to the outer side of the secondary locking component 11, and the second spring 12 is connected to the inner side of the gate valve body 1. A reserved internal groove 13 is opened on the outer side of the reserved sealing valve component 2, and the reserved internal groove 13 corresponds to the position of the secondary locking component 11. An elastic diaphragm 14 is provided inside the middle end of the reserved sealing valve component 2, and a first liquid bladder component 15 is connected to the inner side of the elastic diaphragm 14. The first liquid bladder component 15 is located inside the reserved sealing valve component 2. On the side, the inner side of the limiting locking member 8 is connected to the second liquid bladder component 17, and the second liquid bladder component 17 and the first liquid bladder component 15 are connected by a flexible connecting pipe 16; the outer side of the second liquid bladder component 17 is connected to the first contact switch 18, and the inner side of the built-in support member 9 is equipped with a buzzer component 19, and the outer side of the buzzer component 19 is connected to the second contact switch 20, and the positions of the second contact switch 20 and the first contact switch 18 correspond to each other. The first contact switch 18, the second contact switch 20 and the buzzer component 19 are powered by a preset power supply. When the outer side of the limiting locking member 8 moves to contact the built-in support member 9, the built-in support member 9 moves along the inner side of the gate valve body 1, and the built-in support member 9 drives the second liquid bladder component 15 through the connecting steel rope component 10. The secondary locking element 11 forms a traction movement structure. The limiting locking element 8, under force, moves inwards towards the interior of the gate valve body 1 to lock itself. The inner bearing element 9, which contacts the outer side of the limiting locking element 8, will then displace along the interior of the gate valve body 1 under force. The inner bearing element 9, in conjunction with the outer connecting steel rope component 10, will drive the secondary locking element 11 to move to the inner side of the reserved closing valve component 2 for lateral locking. Thus, based on the intensity of the water flow impact, the limiting locking element 8 and the secondary locking element 11 achieve a double locking protection effect between the gate valve body 1 and the reserved closing valve component 2, ensuring sealing stability during high-pressure load-bearing processes. When the impact intensity of the diverted liquid reaches a level requiring warning, it continues to be pressurized. The nested pre-reserved part 3 will continuously move inward along the inner side of the pre-reserved closed valve part 2 until it applies pressure to the elastic diaphragm 14 in contact with the inner side. In conjunction with the deformation of the elastic diaphragm 14, it will bear negative pressure on the first liquid bladder part 15, allowing the first liquid bladder part 15 to supply the second liquid bladder part 17 through the flexible connecting pipe 16. The expanded and deformed second liquid bladder part 17 will then push the outer first contact switch 18 to move outward. While being locked by the displacement of the limit locking part 8, it will move outward a second time until the first contact switch 18 and the second contact switch 20 make contact and form an electrical connection. This will trigger an alarm through the buzzer part 19, alerting the user to divert and depressurize the branch water flow to avoid damage to the valve.

[0020] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A gate valve with an auxiliary locking structure, comprising a gate valve body (1), wherein a reserved closing valve component (2) is installed on the inner side of the gate valve body (1), and the opening and closing control is performed by the reserved closing valve component (2); Its features are: The inner side of the reserved closed valve component (2) is nested with a nested reserved part (3), and the outer side of the nested reserved part (3) is fixedly connected with a first spring (4), and the first spring (4) and the outer side of the reserved closed valve component (2) are connected to each other. The inner side wall of the reserved closed valve component (2) is nested with a limit locking part (8), and the position of the limit locking part (8) and the inner wall of the gate valve body (1) are corresponding to each other. An adaptive locking structure is provided between the gate valve body (1) and the reserved closed valve component (2), and the reserved closed valve component (2) in the closed state is subjected to auxiliary protection self-locking treatment through the adaptive locking structure.

2. A gate valve with an auxiliary locking structure according to claim 1, characterized in that: The adaptive locking structure is provided with a built-in carrying liquid bladder component (5), and the built-in carrying liquid bladder component (5) is nested and connected to the inner side of the reserved sealing valve component (2). The built-in carrying liquid bladder component (5) and the inner side of the nested reserved component (3) are nested and connected. The inner wall of the reserved sealing valve component (2) is bonded and connected to a corrugated carrying liquid bladder (7), and the outer side of the corrugated carrying liquid bladder (7) is connected to a supply hose (6). The supply hose (6) passes through the inner side of the reserved sealing valve component (2), and the supply hose (6) and the built-in carrying liquid bladder component (5) are connected to each other.

3. A gate valve with an auxiliary locking structure according to claim 2, characterized in that: The outer side of the corrugated liquid-bearing bladder (7) is connected to the limiting locking member (8), and the inner wall of the gate valve body (1) is fitted with an internal bearing member (9), and the internal bearing member (9) and the limiting locking member (8) are positioned to correspond to each other.

4. A gate valve with an auxiliary locking structure according to claim 3, characterized in that: When the nested pre-reserved part (3) comes into contact with the fluid driving force, it moves along the inner side of the reserved closed valve part (2), and the nested pre-reserved part (3) applies pressure to the outer side of the built-in bearing liquid bladder part (5), and the built-in bearing liquid bladder part (5) supplies the corrugated bearing liquid bladder (7) through the supply hose (6), and the corrugated bearing liquid bladder (7) pushes the outer limit locking part (8) to move laterally to the inner wall of the gate valve body (1) for locking.

5. A gate valve with an auxiliary locking structure according to claim 4, characterized in that: A guiding protection structure is provided between the gate valve body (1) and the reserved closing valve component (2), which provides secondary protection stability for the reserved closing valve component (2). The guiding and protective structure is provided with a secondary locking component (11), and the secondary locking component (11) is nested and installed along the inner wall of the gate valve body (1). The secondary locking component (11) and the built-in bearing component (9) are connected by a docking steel rope component (10), and the docking steel rope component (10) passes through the inner side of the gate valve body (1).

6. A gate valve with an auxiliary locking structure according to claim 5, characterized in that: The outer side of the secondary locking member (11) is fixedly connected to a second spring (12), and the second spring (12) is connected to the inner side of the gate valve body (1). The outer side of the reserved closed valve component (2) is provided with a reserved internal groove (13), and the reserved internal groove (13) and the secondary locking member (11) are positioned to correspond to each other.

7. A gate valve with an auxiliary locking structure according to claim 6, characterized in that: An elastic diaphragm (14) is provided inside the middle of the reserved sealing valve component (2), and the inner side of the elastic diaphragm (14) is connected to the first liquid bladder component (15). The first liquid bladder component (15) is located inside the reserved sealing valve component (2). The inner side of the limiting locking member (8) is connected to the second liquid bladder component (17), and a flexible connecting pipe (16) is connected between the second liquid bladder component (17) and the first liquid bladder component (15). The outer side of the second liquid bladder component (17) is connected to a first contact switch (18), the inner side of the built-in carrier (9) is equipped with a buzzer component (19), and the outer side of the buzzer component (19) is connected to a second contact switch (20), and the positions of the second contact switch (20) and the first contact switch (18) correspond to each other.

8. A gate valve with an auxiliary locking structure according to claim 7, characterized in that: When the outer side of the limiting locking member (8) moves to contact the built-in bearing member (9), the built-in bearing member (9) moves along the inner side of the gate valve body (1), and the built-in bearing member (9) drives the secondary locking member (11) to form a traction movement structure through the docking steel rope component (10).

9. A gate valve with an auxiliary locking structure according to claim 8, characterized in that: During the continuous inward movement of the nested pre-reserved part (3) under pressure, pressure will be applied to the elastic diaphragm (14) in contact with the inner side. The elastic diaphragm (14) deforms inward to bear negative pressure on the first liquid bladder component (15), and the first liquid bladder component (15) supplies the second liquid bladder component (17) through the flexible connecting pipe (16). The second liquid bladder component (17) pushes the first contact switch (18) on the outer side to perform secondary movement with the displacement of the limiting locking part (8) until the first contact switch (18) and the second contact switch (20) make contact to form an electrical connection.

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