An external decorative panel without screws and without border strips that can be integrally transported and installed on the escalator truss

Abstract

The present invention provides an external screwless and borderless decorative panel that can be integrally transported and installed on an escalator truss, which relates to the technical field of escalator decorative panels. It includes: the main body is made of elastic alloy material, an outer groove is provided inside the main body, a moving block is installed inside the outer groove, a stress plate is installed between the two moving blocks, a rectangular groove is provided on the side and bottom of the reset plate respectively, a spring is installed inside the rectangular groove at the bottom, and the reset plate is located outside the auxiliary groove. When in use, the moving block is installed inside the outer groove, so that the wedge-shaped groove of the stress plate can contact the top of the support block, enabling the stress plate to automatically move downward by its own gravity and the gravity of the moving block, allowing the stress plate to pull the two sides of the main body inward through the outer groove, improving the fitting effect and preventing the two sides of the main body from loosening easily, solving the problem that for the decorative panel of the escalator truss, after long-term use, the two sides of the decorative panel are prone to looseness and lack a structure for continuous pulling and clamping.

Description

Technical Field

[0001] The present invention relates to the technical field of escalator decorative plates, and particularly to an external screw-free and edge-free decorative plate that can be integrally transported and installed on an escalator truss. Background Art

[0002] An escalator, also known as an automatic pedestrian elevator, moving staircase, or moving walkway, is a transportation device that conveys pedestrians in a conveyor-belt manner. Escalators are generally inclined. Pedestrians stand on the automatically moving steps at one end of the escalator and will be automatically carried to the other end. At the bottom of the escalator, it is usually supported by a truss, and decorative plates are usually installed on the outside of the truss to make the outside of the truss more beautiful.

[0003] However, for the decorative plates of current traditional escalator trusses, during installation, they usually need to be bent. After bending, there is a lack of a structure for pulling and resetting. After long-term use, the two sides of the decorative plates are prone to looseness, and there is a lack of a structure for continuously pulling and tightening. When the decorative plates are connected to the truss, screws and edge strips are likely to appear on the outside, looking less beautiful, and there is a lack of a structure for firmly fixing from the inside. The fixing structure cannot continuously push to strengthen the fixing effect. Since the escalator is always running, vibrations are likely to occur. After long-term use, gaps are likely to appear between the decorative plates, and there is a lack of a structure for automatic tensioning and a structure for automatically reducing gaps. Summary of the Invention

[0004] In view of this, the present invention provides an external screw-free and edge-free decorative plate that can be integrally transported and installed on an escalator truss. It has a stress plate, and a wedge-shaped groove is provided inside the stress plate. The top end of a support block is embedded in the wedge-shaped groove. When the device is in use, the moving block can move downward together with the stress plate, so that the top end of the support block can always pull the stress plate, and thus the two sides of the main body will not become loose.

[0005] The present invention provides an external screwless and borderless decorative panel that can be integrally transported and installed on an escalator truss, specifically including: a main body; the main body is of a U-shaped structure, made of an elastic alloy material, with an outer groove provided inside the main body, a moving block installed inside the outer groove, a stress plate installed between the two moving blocks, the stress plate being of a rectangular plate-like structure, the middle position on the inner side of the stress plate being of a wedge-shaped structure, two reset plates respectively provided on both sides inside the main body, the reset plates being of an L-shaped structure, a rectangular groove respectively provided on the side and bottom of the reset plate, a spring installed inside the rectangular groove at the bottom, and the reset plate being located outside the auxiliary groove; a connecting block, the connecting block being of an L-shaped structure, the inner end of the bottom of the connecting block being of a wedge-shaped structure, there are four connecting blocks in total, the four connecting blocks are respectively installed at the inner corner positions of the main body, and a contact block is installed on the inner side of each connecting block through an auxiliary plate, the contact block being of an L-shaped structure, the bottom end of the contact block being of a wedge-shaped structure; a connecting head, the connecting head being of a U-shaped plate-like structure, there are two connecting heads in total, the two connecting heads are respectively located at the middle positions above both sides of the main body, the bottom of the connecting head is inserted into the rectangular groove at the inner end of the pulling groove, and a slider is respectively sleeved on both outer ends of the connecting head, the slider being of an L-shaped structure, and the slider is embedded inside the pulling groove.

[0006] Optionally, a pulling groove is respectively provided at the middle positions on both sides inside the main body, the pulling groove being of an L-shaped structure, a rectangular groove is correspondingly provided at the inner end of each pulling groove, an auxiliary groove is respectively provided on both sides of the main body, the auxiliary groove being of an arc-shaped structure; a support block is respectively provided at the middle positions at both ends inside the main body, the support block being of an L-shaped structure, the top end and the inner end of the bottom of the support block being of a wedge-shaped structure, the top end of the support block is inserted into the wedge-shaped groove of the stress plate, the outer groove is of a T-shaped structure, and there are four outer grooves in total; the moving block is of a T-shaped structure, a wedge-shaped block is provided on the outer side of the moving block, and the bottom of the wedge-shaped block is connected to the outer end above the stress plate; four pulling plates are provided at the top end of the main body, the pulling plates are located above the auxiliary groove, the inner end of the pulling plate is of an L-shaped structure, the outer end of the pulling plate is of a T-shaped structure, the pulling plate is inserted into the rectangular groove on the side of the reset plate, and the inner side of the outer end of the pulling plate is in contact with the spring.

[0007] Optionally, a connecting groove is provided at the inner angle position of the connecting block, the connecting groove being of an arc-shaped structure, the outer bottom round rod of the truss is embedded inside the connecting groove, an auxiliary plate is provided on the inner side of the connecting block, the auxiliary plate being of a plate-like structure, the inner end of the auxiliary plate being of a wedge-shaped structure; a through groove is provided inside the auxiliary plate, the through groove being of a rectangular structure, the contact block is inserted into the through groove, a support plate is provided above the inner side of the connecting block, and a round hole is provided at the middle position of the support plate; a side groove is provided on the outer side of the support plate, the side groove being of a rectangular structure, a control block is embedded inside the side groove, the control block being of a T-shaped structure, the bottom of the control block is connected to the top end of the contact block, a round rod is provided at the bottom of the outer end of the control block, the round rod is inserted into the round hole of the support plate, the bottom of the round rod is connected to the top end of the contact block, and a spring is sleeved on the outer side of the bottom of the round rod.

[0008] Optionally, a top plate is provided on each side of the top end of the connector. An inner hole is provided inside each top plate, and the inner hole is a circular structure. A chute is provided inside the side of the slider. The chute is a rectangular structure. The connector is embedded inside the chute. A guide rod is provided outside the slider. The guide rod is a cylindrical structure with a middle bulge. The guide rod is inserted inside the inner hole, and a spring is sleeved outside the outer end of the guide rod.

[0009] Beneficial effects

[0010] For the escalator decorative board according to the embodiments of the present invention, compared with the traditional escalator decorative board, its contact block can receive the spring outside the round rod and continuously move downward under force. Since the bottom of the contact block is a wedge-shaped structure, it can continuously contact the round rod of the truss, and then continuously push the round rod, so that the device can be automatically tightened to improve the fixing effect.

[0011] In addition, by installing the force-bearing plate, when the device is in use, the moving block can be installed inside the outer groove, so that the wedge-shaped groove of the force-bearing plate can contact the top end of the support block, and the force-bearing plate can automatically move downward by its own gravity and the gravity of the moving block, so that the top end of the support block can support and push the force-bearing plate, and the force-bearing plate can pull the two sides of the main body inward through the outer groove to close, thereby improving the fitting effect and preventing the two sides of the main body from loosening easily;

[0012] In addition, by installing the reset plate, when the device is installed and used, the main body can be slightly bent, and the auxiliary groove can improve the bending performance of the main body. After bending, the round rod of the truss can be embedded and fixed inside the connecting groove. At this time, the spring inside the rectangular groove at the bottom of the reset plate can be stretched under force, and then push the pull plate to pull, so that the main body can be pulled back to its original position to avoid bending of the main body, and the main body can be stably installed and used;

[0013] In addition, by installing the contact block, when the device is in use, after the round rod of the truss is embedded inside the connecting groove, the contact block can continuously receive the spring force and move downward, so that the bottom of the contact block can contact the round rod of the truss, and then continuously move downward under force, continuously pulling the main body, so that the main body can be stably connected to the truss, the device can be quickly and conveniently installed and connected, there will be no screws and side strips on the outside of the main body, and after the main body is installed, it can be more beautiful;

[0014] In addition, by installing the slider, when multiple main bodies are used together, the slider can be embedded inside the pulling groove, and the spring outside the guide rod can continuously push the slider, so that the slider can continuously displace, and then the two main bodies can be continuously pulled, preventing gaps from appearing between the main bodies after long-term use, reducing the gaps, making the main bodies more tightly connected together, and at the same time making the two main bodies flush and not deformed. Brief Description of the Drawings

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly introduced below.

[0016] The drawings in the following description only relate to some embodiments of the present invention and do not limit the present invention.

[0017] In the drawings:

[0018] Figure 1 shows a schematic diagram of the three-dimensional structure of a spray booth according to an embodiment of the present invention;

[0019] Figure 2 shows a schematic diagram of the bottom view structure of a spray booth according to an embodiment of the present invention;

[0020] Figure 3 shows a schematic diagram of the exploded three-dimensional structure of a spray booth according to an embodiment of the present invention;

[0021] Figure 4 shows a schematic diagram of the exploded bottom view structure of a spray booth according to an embodiment of the present invention;

[0022] Figure 5 shows a schematic diagram of the exploded three-dimensional structure of the main body of a spray booth according to an embodiment of the present invention;

[0023] Figure 6 shows a schematic diagram of the exploded bottom view structure of the main body of a spray booth according to an embodiment of the present invention;

[0024] Figure 7 shows a schematic diagram of the exploded three-dimensional structure of the connection block of a spray booth according to an embodiment of the present invention;

[0025] Figure 8 shows a schematic diagram of the exploded three-dimensional structure of the connector of a spray booth according to an embodiment of the present invention.

[0026] List of Reference Numerals

[0027] 1, main body; 101, draw groove; 102, auxiliary groove; 103, support block; 104, outer groove; 105, moving block; 106, force-bearing plate; 107, draw plate; 108, reset plate;

[0028] 2, connection block; 201, connection groove; 202, auxiliary plate; 203, through groove; 204, support plate; 205, side groove; 206, contact block; 207, control block;

[0029] 3, connector; 301, top plate; 302, inner hole; 303, slider; 304, chute; 305, guide rod. Detailed Description of the Invention

[0030] In order to make the objectives, solutions, and advantages of the technical solutions of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of specific embodiments of the present invention. Unless otherwise specified, the terms used herein have the ordinary meanings in the art. The same reference numerals in the drawings represent the same components.

[0031] Example: Please refer to Figures 1 to 8 :

[0032] The present invention provides an external screwless and borderless decorative panel that can be integrally transported and installed on an escalator truss, including: a main body 1; the main body 1 is a U-shaped structure and can be used for decoration at the bottom and both sides of the truss. The main body 1 is made of elastic alloy material, can be deformed for installation, and can also be installed with reduced weight to reduce the risk of falling. An outer groove 104 is provided inside the main body 1, and a moving block 105 is installed inside the outer groove 104. A stress plate 106 is installed between the two moving blocks 105. The stress plate 106 is a rectangular plate-like structure, and the middle position on the inner side of the stress plate 106 is a wedge-shaped structure, which is used to contact the top end of the support block 103, so as to continuously receive force and enable the stress plate 106 to be pulled and move inward, so that both sides of the main body 1 can be tightened and closed without gaps. Two reset plates 108 are respectively provided on both sides inside the main body 1. The reset plate 108 is an L-shaped structure, and a rectangular groove is provided on the side and bottom of the reset plate 108 respectively. The rectangular groove on the side is used to install the pull plate 107 to enable the pull plate 107 to be guided and displaced. A spring is installed inside the rectangular groove at the bottom. After the main body 1 is bent, the spring can stretch inside the rectangular groove, and then push the main body 1 to reset. The reset plate 108 is located outside the auxiliary groove 102; a connecting block 2, the connecting block 2 is an L-shaped structure, and the inner end at the bottom of the connecting block 2 is a wedge-shaped structure, which is used to connect with the truss. There are four connecting blocks 2 in total, and the four connecting blocks 2 are respectively installed at the inner corner positions of the main body 1, so that the corner positions of the main body 1 can be supported to avoid deformation. An abutting block 206 is installed inside each connecting block 2 through an auxiliary plate 202. The abutting block 206 is an L-shaped structure, and the bottom end of the abutting block 206 is a wedge-shaped structure, so that the top end of the abutting block 206 can receive the power of the spring and move downward, and then the bottom of the abutting block 206 can continuously contact and receive force from the truss, so that the main body 1 can be stably installed and connected; a connecting head 3, the connecting head 3 is a U-shaped plate-like structure. There are two connecting heads 3 in total, and the two connecting heads 3 are respectively located at the middle positions above both sides of the main body 1 and can connect the two main bodies 1 together. The bottom of the connecting head 3 is inserted into the rectangular groove at the inner end of the pulling groove 101. A slider 303 is sleeved on each outer end of the connecting head 3. The slider 303 is an L-shaped structure, and the slider 303 is embedded in the pulling groove 101, so that the two sliders 303 can be respectively installed inside the adjacent pulling grooves 101 of the two main bodies 1, and then the main bodies 1 can be tightened, and the gap between the main bodies 1 can be reduced.

[0033] Reference Figure 5 and Figure 6, on the middle positions of both inner sides of the main body 1, a pulling groove 101 is respectively provided. The pulling groove 101 is of an L-shaped structure and is used to embed and install the sliding block 303, so as to receive the power displacement of the sliding block 303, enabling the two main bodies 1 to be effectively closed together. A rectangular groove is correspondingly provided at the inner end of each pulling groove 101 for inserting and installing the bottom of the connecting head 3, enabling the connecting heads 3 to be connected together. On both sides of the main body 1, an auxiliary groove 102 is respectively provided. The auxiliary groove 102 is of an arc-shaped structure and is used to provide the bending position of the main body 1, enabling the main body 1 to be effectively bent and installed; on the middle positions of both inner ends of the main body 1, a support block 103 is respectively provided. The support block 103 is of an L-shaped structure. The top end and the inner end of the bottom of the support block 103 are both of a wedge-shaped structure. The top end of the support block 103 can contact the wedge-shaped groove of the force-bearing plate 106, thereby continuously pulling the force-bearing plate 106 and the moving block 105, enabling the two sides of the main body 1 to be closed together and preventing looseness and gaps. The top end of the support block 103 is inserted into the wedge-shaped groove inside the force-bearing plate 106. The outer groove 104 is of a T-shaped structure. There are four outer grooves 104 in total and they are used to install the moving block 105, enabling the moving block 105 to move downward in a guiding manner; the moving block 105 is of a T-shaped structure. A wedge-shaped block is provided on the outer side of the moving block 105, enabling the whole moving block 105 to be stressed, thereby pulling the two sides of the main body 1. The bottom of the wedge-shaped block is connected to the outer end of the upper part of the force-bearing plate 106, enabling the wedge-shaped block and the moving block 105 to be pulled when the force-bearing plate 106 moves; four pulling plates 107 are provided at the top of the main body 1. The pulling plates 107 are located above the auxiliary grooves 102 and can pull the main body 1 to reset after bending at the positions of the auxiliary grooves 102. The inner end of the pulling plate 107 is of an L-shaped structure, and the outer end of the pulling plate 107 is of a T-shaped structure. The pulling plate 107 is inserted into the rectangular groove on the side of the reset plate 108. The inner side of the outer end of the pulling plate 107 contacts the spring and can be stressed through the spring, thereby facilitating the reset of the main body 1.

[0034] Reference Figure 7, there is a connecting groove 201 at the internal included angle position of the connecting block 2. The connecting groove 201 is an arc-shaped structure, and the outer bottom circular rod of the truss is embedded inside the connecting groove 201 for effective connection and installation with the truss. An auxiliary plate 202 is provided inside the connecting block 2. The auxiliary plate 202 is a plate-shaped structure for assisting in the installation of the contact block 206. The inner end of the auxiliary plate 202 is a wedge-shaped structure, which can guide the truss to be embedded; there is a through groove 203 inside the auxiliary plate 202. The through groove 203 is a rectangular structure, and the contact block 206 is inserted inside the through groove 203 to enable the contact block 206 to be displaced in a guided manner. Above the inner side of the connecting block 2, there is a support plate 204. There is a circular hole in the middle of the support plate 204 for guiding the movement of the circular rod and enabling the support plate 204 to be at the top of the spring for support; there is a side groove 205 on the outer side of the support plate 204. The side groove 205 is a rectangular structure, and the control block 207 is embedded inside the side groove 205 to enable the control block 207 to be displaced in a guided manner. The control block 207 is a T-shaped structure, and the bottom of the control block 207 is connected to the top of the contact block 206 to push the contact block 206 to displace. There is a circular rod at the bottom of the outer end of the control block 207. The circular rod is inserted inside the circular hole of the support plate 204, and the bottom of the circular rod is connected to the top of the contact block 206. A spring is sleeved on the outer side of the bottom of the circular rod, enabling the spring to push the contact block 206, so that the contact block 206 can receive the power of the spring and continue to be displaced under force.

[0035] Reference Figure 8 , on both sides of the top of the connector 3, there is a top plate 301 respectively for assisting in supporting the guide rod 305 and enabling the spring outside the guide rod 305 to push the slider 303 under force. There is an inner hole 302 inside each top plate 301. The inner hole 302 is a circular structure for enabling the guide rod 305 to be displaced in a guided manner; there is a chute 304 inside the side of the slider 303. The chute 304 is a rectangular structure, and the connector 3 is embedded inside the chute 304 to enable the slider 303 to be displaced in a guided manner on the outside of the connector 3. There is a guide rod 305 on the outside of the slider 303. The guide rod 305 is a cylindrical structure with a middle bulge. The guide rod 305 is inserted inside the inner hole 302, and a spring is sleeved on the outer side of the outer end of the guide rod 305 to enable the spring to be supported. Furthermore, the spring can push the slider 303 to be inserted and fixed inside the pulling groove 101, and at the same time, it can pull the two main bodies 1 to reduce the gap between the two main bodies 1.

[0036] Specific usage and functions of this embodiment: In the present invention, when the device needs to be used, multiple main bodies 1 can be horizontally spliced together manually first. Then, manually pull the slider 303 outward, and then control the bottom of the slider 303 to be inserted into the inside of the pulling groove 101. At the same time, make the bottom of the connecting head 3 be inserted into the rectangular groove at the inner end of the pulling groove 101, so that the spring can push the slider 303, and then connect the main body 1 to move. Then, manually control the installation of the moving block 105, so that the moving block 105 can be embedded into the inside of the outer groove 104, and the wedge-shaped groove of the stress plate 106 can contact the top of the support block 103. Then, manually pull the main body 1, so that the auxiliary groove 102 position of the main body 1 can be bent, and the pull plate 107 moves in the rectangular groove on the side of the reset plate 108, and then compress the spring in the rectangular groove at the bottom of the reset plate 108. Then, manually control the movement of the main body 1, so that the main body 1 can be located outside the truss, and the outer bottom round rod can be embedded into the inside of the connecting groove 201. Then, release the main body 1, so that the spring in the rectangular groove of the reset plate 108 can be stretched under force, and assist in pushing the pull plate 107. The pull plate 107 and the reset plate 108 can cooperate together, so that the main body 1 can be reset. At the same time, the moving block 105 and the stress plate 106 can move downward by their own gravity, so that the wedge-shaped groove of the stress plate 106 can contact and be stressed by the top of the support block 103, and the stress plate 106 can receive a force pulling inward. Then, both sides of the main body 1 can be pulled together, and both sides of the main body 1 can be clamped, so as to prevent deformation after long-term use. At the same time, the contact block 206 continuously receives the power of the spring and moves downward, so that the bottom of the contact block 206 continuously pushes the truss, and the main body 1 can be stressed, and then the truss is firmly connected to the main body 1, so that the device can be firmly installed and used. At the same time, after multiple main bodies 1 are spliced, the slider 303 continuously receives the power of the spring and displaces, and then continuously pulls the main bodies 1 together to avoid gaps. At the same time, after multiple main bodies 1 are spliced, there are no screws and side strips on their exteriors, so that the exterior of the main body 1 can be more flat and beautiful.

[0037] Finally, it should be noted that when describing the positions of various components and their cooperation relationships, etc. in the present invention, usually one / a pair of components are taken as examples. However, those skilled in the art should understand that such positions, cooperation relationships, etc. are equally applicable to other components / other pairs of components.

[0038] The above are only exemplary embodiments of the present invention and are not used to limit the protection scope of the present invention. The protection scope of the present invention is determined by the appended claims.

Claims

1. An external decorative panel without screws and border strips that can be integrally transported and installed on an escalator truss, characterized in that, Comprising: A main body (1); the main body (1) is made of an elastic alloy material. An outer groove (104) is provided inside the main body (1). A moving block (105) is installed inside the outer groove (104). A stress plate (106) is installed between the two moving blocks (105). The middle position on the inner side of the stress plate (106) is a wedge-shaped structure. A reset plate (108) is provided inside the main body (1). A rectangular groove is provided on each of the side and bottom of the reset plate (108). A spring is installed inside the rectangular groove at the bottom. The reset plate (108) is located outside the auxiliary groove (102); A connecting block (2), the inner end of the bottom of the connecting block (2) is a wedge-shaped structure. The connecting block (2) is installed at the corner position of the main body (1). A contact block (206) is installed inside the connecting block (2) through an auxiliary plate (202). The bottom end of the contact block (206) is a wedge-shaped structure; A connecting head (3), there are two connecting heads (3) in total. The two connecting heads (3) are respectively located at the middle positions above the two sides of the main body (1). The bottom of the connecting head (3) is inserted into the rectangular groove at the inner end of the pulling groove (101). A slider (303) is sleeved on each of the two outer ends of the connecting head (3). The slider (303) is an L-shaped structure. The slider (303) is embedded inside the pulling groove (101); Inside the main body (1), a pulling groove (101) is provided at the middle position of each of the two sides. A rectangular groove is correspondingly provided at the inner end of each pulling groove (101). An auxiliary groove (102) is provided on each of the two sides of the main body (1); A connecting groove (201) is provided at the inner angle position of the connecting block (2). The outer bottom round rod of the truss is embedded inside the connecting groove (201). An auxiliary plate (202) is provided inside the connecting block (2). The inner end of the auxiliary plate (202) is a wedge-shaped structure; A through groove (203) is provided inside the auxiliary plate (202). A contact block (206) is inserted into the through groove (203). A support plate (204) is provided above the inner side of the connecting block (2). A circular hole is provided at the middle position of the support plate (204); A side groove (205) is provided outside the support plate (204). A control block (207) is embedded inside the side groove (205). The bottom of the control block (207) is connected to the top of the contact block (206). A round rod is provided at the outer bottom end of the control block (207). The round rod is inserted into the circular hole of the support plate (204). The bottom of the round rod is connected to the top of the contact block (206). A spring is sleeved on the outer side of the bottom of the round rod.

2. The externally screwless and borderless decorative panel that can be integrally transported and installed on the escalator truss according to claim 1, characterized in that: At the middle positions of the two ends inside the main body (1), a support block (103) is respectively provided. The top end and the inner end of the bottom of the support block (103) are both wedge-shaped structures. The top end of the support block (103) is inserted into the wedge-shaped groove of the stress plate (106). The outer groove (104) is a T-shaped structure, and there are four outer grooves (104) in total.

3. The externally screwless and borderless decorative panel that can be integrally transported and installed on the escalator truss as claimed in claim 1, wherein: A wedge-shaped block is provided on the outer side of the moving block (105). The bottom of the wedge-shaped block is connected to the outer end above the stress plate (106).

4. The externally screwless and borderless decorative panel that can be integrally transported and installed on the escalator truss as claimed in claim 1, wherein: Four pull plates (107) are provided at the top of the main body (1). The pull plates (107) are located above the auxiliary grooves (102). The inner ends of the pull plates (107) are of an L-shaped structure. The pull plates (107) are inserted into the rectangular grooves on the sides of the reset plates (108). The inner sides of the outer ends of the pull plates (107) are in contact with the springs.

5. The external screwless and borderless decorative panel that can be integrally transported and installed on the escalator truss as claimed in claim 1, wherein: One top plate (301) is provided on each side of the top of the connector (3). An inner hole (302) is provided inside the top plate (301).

6. The externally screwless and borderless decorative panel that can be integrally transported and installed on the escalator truss according to claim 5, characterized in that: A chute (304) is provided inside the side of the slider (303). The connector (3) is embedded inside the chute (304). A guide rod (305) is provided on the outside of the slider (303). The guide rod (305) is of a cylindrical structure with a middle bulge. The guide rod (305) is inserted into the inner hole (302). A spring is sleeved on the outside of the outer end of the guide rod (305).

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