A butt welder with easy positioning

Abstract

The utility model discloses a convenient to position butt welding machine, including having the welding machine body of welding platform plane, welding platform subassembly and drive assembly, welding platform subassembly can slideable installation on the welding machine body, and drive assembly is connected with welding platform subassembly drive, and welding platform subassembly includes reset double slide platform structure, welding needle and clamping jaw structure, and reset double slide platform structure includes the upper slide platform and lower slide platform of relatively slideable and reset piece, and the upper slide platform is slidably connected with the welding machine body, and the welding needle is installed on the upper slide platform, and the clamping jaw structure is installed on the lower slide platform, such setting, through reset double slide platform structure of welding platform subassembly and drive assembly cooperation, drive the welding needle of installation on the upper slide platform and the clamping jaw of lower slide platform coordinated action, and the clamping jaw can hold down workpiece and press in the welding platform plane positioning, and make the welding needle accurate and touch upper workpiece, realize small -size parts and metal frame preset position accurate alignment, improve the welding effect, reduce the position adjustment frequency, effectively improve the welding efficiency.

Description

Technical Field

[0001] This utility model relates to the field of metal jewelry spot welding equipment, and in particular to a spot welding machine that is easy to position. Background Technology

[0002] As a commonly used welding equipment in industry, spot welding machines mainly achieve permanent connections between metal workpieces through resistance heat and mechanical pressure. Its core is to allow metal to form a joint with strength close to that of the base material through high-temperature plastic deformation and atomic diffusion in a state of non-melting or partial melting. It has a short welding time (in milliseconds), can be adapted to automated production lines to meet the needs of mass production, and can also realize various welding forms such as spot welding, projection welding, and butt welding to deal with different workpiece structures. During operation, welding is completed in three steps: applying electricity and pressure, generating resistance heat, and cooling and shaping.

[0003] In existing technologies, in metal jewelry processing, small parts (such as jewelry rivets, metal pendants, and metal clasps) need to be welded onto metal frames. However, because these parts are extremely small and have significant differences in shape, they are prone to slipping off during the welding process. This makes it difficult for workers to align the metal parts with the preset positions on the metal frame, requiring multiple adjustments for each part. As a result, the welding effect is poor, the welding efficiency is low, and production needs cannot be met. Utility Model Content

[0004] The purpose of this invention is to provide a spot welding machine that is easy to position, thereby solving the technical problem of difficulty in aligning workpieces in existing spot welding machines.

[0005] To achieve the above objectives, the present invention provides a convenient positioning spot welding machine, comprising: a welding machine body having a welding station plane, a welding station assembly, and a drive assembly, wherein the welding station assembly is slidably mounted vertically on the welding machine body, and the drive assembly is drivenly connected to the welding station assembly.

[0006] The soldering station assembly includes:

[0007] A reset double slide structure is provided, comprising an upper slide and a lower slide that can slide relative to each other, and a reset member. The upper slide is slidably connected to the welding machine body, and the reset member is used to push the lower slide away from the upper slide.

[0008] A welding needle, which is mounted on the upper slide, and the welding needle is capable of having a first electrode;

[0009] A gripper structure is mounted on the lower slide. The gripper structure may have a second electrode. The drive assembly is driven to the upper slide to drive the gripper structure to clamp and press the lower workpiece against the welding station plane and to bring the welding needle against the upper workpiece.

[0010] Furthermore, the gripper structure includes:

[0011] A gripper body, which is mounted on the sliding platform;

[0012] The left support leg is obliquely mounted on the gripper body to press against one side of the lower workpiece.

[0013] The right support leg is obliquely mounted on the gripper body to press against the other side of the lower workpiece.

[0014] Furthermore, the left support leg is detachably mounted on the gripper body;

[0015] And / or, the right support leg is detachably mounted on the gripper body.

[0016] Furthermore, the tilt angle of the left support leg can be adjusted.

[0017] Furthermore, the tilt angle of the right support leg can be adjusted.

[0018] Furthermore, the left support leg and the right support leg are spaced apart so that the lower end of the welding needle can slide up and down between the left support leg and the right support leg.

[0019] Furthermore, the gripper body is provided with a first threaded hole, and the sliding table is provided with a second threaded hole. The first threaded hole and the second threaded hole are provided in a corresponding manner so that the gripper body can be detachably installed on the sliding table by passing the bolt through the first threaded hole and the second threaded hole in sequence and screwing the nut into the end of the bolt.

[0020] Furthermore, the gripper structure is made of a metallic material so that the gripper structure has a first electrode by connecting the positive or negative electrode of the welding machine body to the gripper structure.

[0021] Furthermore, the welding needle is made of a metallic material so that the welding needle has a second electrode by connecting the positive or negative electrode of the welding machine body to the welding needle.

[0022] Furthermore, the upper sliding platform is provided with a sliding through groove, and the lower sliding platform includes:

[0023] A sliding rod is slidably installed in the sliding through groove, with both ends of the sliding rod protruding from the sliding through groove, and a limiting protrusion formed at the top of the sliding rod;

[0024] A skateboard, which is mounted on the bottom of the sliding rod;

[0025] The reset component is a compression spring structure, the top of which abuts against the limiting protrusion, the bottom of which abuts against the sliding plate, and the upper slide is connected to the compression spring structure.

[0026] As can be seen from the above technical solution, the beneficial effect of this utility model is that the user can activate the drive component to drive the reset double slide structure to work. First, the reset double slide structure slides downward so that the gripper structure can press the lower workpiece onto the welding station plane from both sides, and limit the welding area of ​​the upper workpiece to be welded between the gripper structures. Then, the upper slide continues to move downward until the welding needle contacts the upper workpiece. The welding machine body inputs current from different electrodes to the gripper structure and the welding needle to complete the welding process. With this setting, the reset double slide structure of the welding station assembly cooperates with the drive component to drive the welding needle installed on the upper slide and the gripper on the lower slide to work together. The gripper can clamp and press the lower workpiece against the welding station plane for positioning, and make the welding needle accurately contact the upper workpiece, avoiding the problem of repeated manual position adjustment. It achieves precise alignment of small-sized parts with the preset position of the metal frame. This structure improves the welding position accuracy, improves the welding effect, reduces the number of position adjustments, and effectively improves the welding efficiency.

[0027] To make the technical concept, other objectives, advantages, features and functions of this utility model clearer and easier to understand, preferred embodiments will be specifically described in the following detailed description, and will be illustrated in conjunction with the accompanying drawings. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a perspective view of a spot welding machine for easy positioning provided in an embodiment of this application;

[0030] Figure 2 This is provided by the embodiments of this application. Figure 1 Enlarged view of the middle section structure;

[0031] Figure 3 This is a front view of the spot welding machine provided in the embodiments of this application for easy positioning;

[0032] Figure 4 This is a perspective view of the spot welding machine provided in the embodiments of this application, which facilitates positioning.

[0033] Figure 5 This is a perspective view of the gripper provided in the embodiments of this application;

[0034] Figure 6 This is a perspective view of the gripper provided in an embodiment of this application;

[0035] Figure 7 This is a schematic diagram of the pre-welding state provided in the embodiments of this application;

[0036] Figure 8 This is a schematic diagram of the workpiece being clamped by the gripper structure provided in the embodiment of this application;

[0037] Figure 9 This is a schematic diagram of the welding needle touching the workpiece according to an embodiment of this application;

[0038] The above figures include the following reference numerals:

[0039] 100. Welding machine body; 110. Welding station surface;

[0040] 200. Welding station assembly; 210. Reset double slide structure; 211. Upper slide; 211a. Sliding through groove; 212. Lower slide; 212a. Sliding rod; 212b. Limiting protrusion; 212c. Slide plate; 213. Reset component; 220. Welding pin; 230. Clamping structure; 231. Clamping body; 232. Left support leg; 233. Right support leg. Detailed Implementation

[0041] To enable those skilled in the art to better understand the technical solutions of this application, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0042] Please refer to the following: Figures 1 to 9This embodiment provides a convenient positioning spot welding machine, including a welding machine body 100 with a welding station plane 110, a welding station assembly 200, and a drive assembly. The welding station assembly 200 is slidably mounted vertically on the welding machine body 100. The drive assembly is drivenly connected to the welding station assembly 200. The welding station assembly 200 includes a reset double slide structure 210, welding pins 220, and a gripper structure 230. The reset double slide structure 210 includes an upper slide 211 and a lower slide 212 that can slide relative to each other, as well as a reset member 213. 211 is slidably connected to the welding machine body 100. The reset member 213 is used to push the lower slide 212 away from the upper slide 211. The welding needle 220 is mounted on the upper slide 211 and can have a first electrode. The gripper structure 230 is mounted on the lower slide 212 and can have a second electrode. The drive assembly is drivenly connected to the upper slide 211 to drive the gripper structure 230 to clamp and press the lower workpiece onto the welding station plane 110 and to press the welding needle 220 against the upper workpiece.

[0043] As can be seen, the easy-to-position spot welding machine of this embodiment can drive the reset double slide structure 210 to work by the user starting the drive component. First, the lower slide 212 slides down so that the gripper structure 230 can press the lower workpiece onto the welding table plane 110 from both sides, and limit the welding area of ​​the upper workpiece to be welded between the gripper structures 230. Then, the upper slide 211 continues to move down until the welding needle 220 contacts the upper workpiece. The welding machine body 100 inputs current from different electrodes to the gripper structure 230 and the welding needle 220 to complete the welding process. With this configuration, the reset double slide structure 210 of the welding station assembly 200 cooperates with the drive assembly to drive the welding needle 220 mounted on the upper slide 211 and the gripper of the lower slide 212 to move in tandem. The gripper can clamp and press the lower workpiece against the welding station plane 110 for positioning, and make the welding needle 220 accurately contact the upper workpiece, avoiding the problem of repeated manual position adjustments. This achieves precise alignment between small-sized parts and the preset position of the metal frame. This structure improves the welding position accuracy, improves the welding effect, reduces the number of position adjustments, and effectively improves the welding efficiency.

[0044] It should be noted that the drive assembly is not shown in the diagram. The drive assembly is connected to the upper slide 211. The drive assembly can adopt existing mechanical drive structures and electric drive structures to drive the up and down sliding of the reset double slide structure 210. The mechanical drive structure is preferably a pedal mechanical drive structure, and the electric drive structure is preferably an electric push rod structure. This is existing technology and is not the focus of this solution, so it will not be elaborated on here. In addition, the welding machine body 100 adopts existing welding machine components. The welding machine body 100 has a transformer, welding circuit, etc. One of the first electrode and the second electrode is a positive electrode, and the other of the first electrode and the second electrode is a negative electrode. The welding needle 220 and the gripper structure 230 are respectively connected to the positive and negative electrodes of the welding circuit so that when the user starts the welding circuit, the welding needle 220 and the gripper structure 230 can have instantaneous current.

[0045] In this embodiment, the gripper structure 230 includes a gripper body 231, a left support leg 232, and a right support leg 233. The gripper body 231 is mounted on the sliding table 212. The left support leg 232 is obliquely mounted on the gripper body 231 so as to press against one side of the lower workpiece obliquely. The right support leg 233 is obliquely mounted on the gripper body 231 so as to press against the other side of the lower workpiece obliquely.

[0046] By installing the left support leg 232 and the right support leg 233 obliquely onto the gripper body 231, the gripper structure 230 can press against the lower workpiece from both sides, achieving stable clamping of the lower workpiece, preventing displacement during welding, and assisting in precise positioning. This ensures accurate alignment of the upper and lower workpieces to guarantee welding accuracy and quality, and allows for small-scale adaptation to workpieces of different shapes and sizes, expanding the application range of the equipment. At the same time, the spacing between the left support leg 232 and the right support leg 233 allows the lower end of the welding needle 220 to slide smoothly up and down between them, avoiding obstruction of the welding needle 220's operation and ensuring the normal progress of the welding process.

[0047] In this embodiment, the right support leg 233 is detachably mounted on the gripper body 231. The tilt angle of the right support leg 233 is adjustable. The gripper body 231 is provided with a mounting screw hole, and the right support leg 233 is provided with a mounting through hole. By screwing a screw into the mounting screw hole through the mounting through hole, the right support leg 233 can be detachably mounted on the gripper body 231, and the tilt angle of the right support leg 233 can be adjusted. This configuration allows the right support leg 233 to be replaced according to actual welding needs. For example, when it is necessary to adapt to workpieces of different sizes and shapes, the gripping position and force on the workpiece can be adjusted by replacing the right support leg 233 with different lengths, tilt angles, or structures. This enhances the adaptability of the gripper structure 230 to diverse workpieces and expands the application range of the spot welding machine. Meanwhile, if the right support leg 233 is worn, deformed or damaged, the detachable design makes it easy to replace the right support leg 233 separately without replacing the entire gripper structure 230, which reduces maintenance costs and replacement difficulty, and improves the ease of use and economy of the equipment.

[0048] In one possible implementation, the left support leg 232 is detachably mounted on the gripper body 231, and the tilt angle of the left support leg 232 is adjustable.

[0049] In this embodiment, a first threaded hole is provided on the gripper body 231, and a second threaded hole is provided on the lower slide 212. The first and second threaded holes are correspondingly arranged so that the gripper body 231 can be detachably installed on the lower slide 212 by passing a bolt through the first and second threaded holes in sequence and screwing a nut into the end of the bolt. This arrangement makes it easy to assemble and disassemble the gripper body 231. With the standardized operation of the threaded connection, the installation, fixing or disassembly of the gripper body 231 can be completed quickly, improving the efficiency of equipment debugging and maintenance. The threaded fit can provide sufficient tightening force to ensure that there is no relative displacement between the gripper body 231 and the lower slide 212 during the welding process, ensuring the clamping positioning accuracy and welding quality. If it is necessary to replace the gripper structure 230 of different specifications to adapt to various workpieces, the detachable design supports quick replacement, expanding the applicability of the equipment and making maintenance economical. When the gripper body 231 is worn or damaged, it can be disassembled and replaced separately without replacing the entire lower slide 212 assembly, reducing maintenance costs.

[0050] In this embodiment, the gripper structure 230 is made of a metallic material so that it has a first electrode by connecting the positive or negative electrode of the welding machine body 100 to the gripper structure 230. The welding needle 220 is made of a metallic material so that it has a second electrode by connecting the positive or negative electrode of the welding machine body 100 to the welding needle 220.

[0051] The gripper structure 230 and welding pin 220 are preferably made of copper. Utilizing copper's conductivity, they function as electrode carriers while simultaneously clamping, positioning, and contacting the workpiece, eliminating the need for separate conductive components. This simplifies the equipment structure, reduces the number of parts and assembly complexity, and lowers manufacturing and maintenance costs. Copper's excellent conductivity ensures stable and reliable current conduction, preventing welding quality fluctuations due to poor contact and improving welding consistency. Furthermore, the direct contact between the gripper and welding pin 220 allows current to precisely flow through the contact point between the two workpieces, forming a circuit and concentrating on the welding area, improving energy efficiency and ensuring a strong weld. The integrated design also allows positioning and conductive operations to occur simultaneously, optimizing the welding process and improving work efficiency.

[0052] In this embodiment, the upper slide 211 has a sliding groove 211a, and the lower slide 212 includes a sliding rod 212a and a sliding plate 212c. The sliding rod 212a is slidably installed in the sliding groove 211a, and both ends of the sliding rod 212a pass through the sliding groove 211a respectively. A limiting protrusion 212b is formed at the top of the sliding rod 212a. The sliding plate 212c is installed at the bottom of the sliding rod 212a. The reset member 213 is a compression spring structure. The top of the compression spring structure abuts against the limiting protrusion 212b, and the bottom of the compression spring structure abuts against the sliding plate 212c. The upper slide 211 is connected to the compression spring structure.

[0053] The upper slide 211 and the lower slide 212 achieve stable relative sliding through the sliding groove 211a of the upper slide 211 and the sliding rod 212a of the lower slide 212. The limiting protrusion 212b prevents the sliding rod 212a from disengaging from the sliding groove 211a, ensuring the reliability of the structural connection. The compression spring structure abuts against the limiting protrusion 212b and the sliding plate 212c respectively and is connected to the upper slide 211, providing a stable restoring force to push the lower slide 212 away from the upper slide 211, ensuring that the lower slide 212 can automatically reset after welding, facilitating the next operation. The overall structure achieves sliding and reset functions through mechanical cooperation. The structure is simple and compact, and the operation is stable. It ensures smooth linkage when the drive component drives the gripper structure 230 to clamp the workpiece and the welding needle 220 to abut against the workpiece, and can quickly return to the initial state after welding, improving the working efficiency and reliability of the equipment.

[0054] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects:

[0055] The user-activated drive component enables the reset double slide structure 210 to operate. First, the lower slide 212 slides downward so that the gripper structure 230 can press the lower workpiece onto the welding station plane 110 from both sides, and confine the welding area of ​​the upper workpiece between the gripper structures 230. Then, the upper slide 211 continues to move downward until the welding needle 220 contacts the upper workpiece. The welding machine body 100 inputs currents of different electrodes to the gripper structure 230 and the welding needle 220 to complete the welding process. With this configuration, the reset double slide structure 210 of the welding station assembly 200, in cooperation with the drive component, drives the welding needle 220 mounted on the upper slide 211 and the gripper of the lower slide 212 to move in tandem. The gripper can clamp and press the lower workpiece against the welding station plane 110 for positioning, and make the welding needle 220 accurately contact the upper workpiece, avoiding the problem of repeated manual position adjustments. This achieves precise alignment of small-sized parts with the preset position of the metal frame. This structure improves the welding position accuracy, improves the welding effect, reduces the number of position adjustments, and effectively improves the welding efficiency.

[0056] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0057] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0058] It should be noted that, in the description of this application, unless otherwise expressly specified and limited, the terms "set, connect, link, install" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, abutting connections, or integral connections. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0059] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "lateral, longitudinal, vertical, horizontal" and "top, bottom" are generally based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; in addition, the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0060] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0061] In this specification, the terms "longitudinal," "lateral," "top," "bottom," "inner," "outer," "central," "axial," "radial," and "circumferential," etc., are intended only to facilitate the description of this application and simplify the description based on the directional or positional relationships shown in the accompanying drawings, and are not intended to indicate or imply that the device or element involved must have a specific orientation. The device is constructed and operates in a specific orientation and therefore should not be construed as a limitation of this application.

[0062] Furthermore, it should be noted that in the description of this utility model, the use of terms such as "first" and "second" to define the components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application. In the description of this utility model, unless otherwise stated, "multiple" means two or more.

[0063] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications are also considered to be within the protection scope of this utility model.

Claims

1. A spot welding machine for easy positioning, characterized in that, include: The welding machine body (100), welding station assembly (200), and drive assembly have a welding station plane (110), the welding station assembly (200) being slidably mounted on the welding machine body (100) in a vertical direction, and the drive assembly being drivenly connected to the welding station assembly (200). The soldering station assembly includes: A reset double slide structure (210) is provided, which includes an upper slide (211) and a lower slide (212) that can slide relative to each other, and a reset member (213). The upper slide (211) is slidably connected to the welding machine body (100), and the reset member (213) is used to push the lower slide (212) away from the upper slide (211). A welding needle (220) is mounted on the upper slide (211) and the welding needle (220) is capable of having a first electrode; A gripper structure (230) is mounted on the lower slide (212). The gripper structure (230) may have a second electrode. The drive assembly is driven to the upper slide (211) so that the gripper structure (230) on the lower slide (212) is driven by the reset member (213) to clamp and press the lower workpiece against the welding station plane (110) and to press the welding needle (220) against the upper workpiece.

2. The easy-to-position spot welding machine according to claim 1, characterized in that, The gripper structure (230) includes: The gripper body (231) is mounted on the sliding platform (212); The left support leg (232) is obliquely mounted on the gripper body (231) so as to press against one side of the lower workpiece obliquely through the left support leg (232); The right support leg (233) is obliquely mounted on the gripper body (231) so as to press against the other side of the lower workpiece obliquely through the right support leg (233).

3. The easy-to-position spot welding machine according to claim 2, characterized in that, The left support leg (232) is detachably mounted on the gripper body (231); And / or, the right support leg (233) is detachably mounted on the gripper body (231).

4. The easy-to-position spot welding machine according to claim 2, characterized in that, The tilt angle of the left support leg (232) can be adjusted.

5. The easy-to-position spot welding machine according to claim 2, characterized in that, The tilt angle of the right support leg (233) can be adjusted.

6. The easy-to-position spot welding machine according to claim 2, characterized in that, The left support leg (232) and the right support leg (233) are spaced apart so that the lower end of the welding needle (220) can slide up and down between the left support leg (232) and the right support leg (233).

7. The easy-to-position spot welding machine according to claim 2, characterized in that, The gripper body (231) has a first threaded hole, and the sliding table (212) has a second threaded hole. The first threaded hole and the second threaded hole are arranged correspondingly so that the gripper body (231) can be detachably installed on the sliding table (212) by passing the bolt through the first threaded hole and the second threaded hole in sequence and screwing the nut into the end of the bolt.

8. The easy-to-position spot welding machine according to claim 1, characterized in that, The gripper structure (230) is made of metal material so that the gripper structure (230) has a first electrode by connecting the positive or negative electrode of the welding machine body (100) to the gripper structure (230).

9. The easy-to-position spot welding machine according to claim 1, characterized in that, The welding needle (220) is made of a metallic material so that the welding needle (220) has a second electrode by connecting the positive or negative electrode of the welding machine body (100) to the welding needle (220).

10. The easy-to-position spot welding machine according to claim 1, characterized in that, The upper sliding table (211) is provided with a sliding through groove (211a), and the lower sliding table (212) includes: A sliding rod (212a) is slidably installed in the sliding through groove (211a), and both ends of the sliding rod (212a) protrude from the sliding through groove (211a) respectively. A limiting protrusion (212b) is formed at the top of the sliding rod (212a). A sliding plate (212c) is mounted on the bottom of the sliding rod (212a); The reset member (213) is a compression spring structure. The top of the compression spring structure abuts against the limiting protrusion (212b), the bottom of the compression spring structure abuts against the sliding plate (212c), and the upper slide (211) is connected to the compression spring structure.

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