A copper wire stranding device for cable production

Abstract

The utility model relates to cable production equipment technical field discloses a copper wire stranding device for cable production, including support base plate, stranding frame movement adjusting part, copper wire stranding clamping part, the bottom outer wall symmetry fixed mounting of support base plate has the support fixed leg. The utility model three -way slide rail and the cooperation of clamping sliding block can form the firm clamping to copper wire, when clamping sliding block is in the three -way slide rail sliding, is limited and the guiding effect of slide rail, avoids the copper wire and appears slack or deviation in the stranding process, and the linkage design of rotating round plate and arc sliding mouth, sliding rod simultaneously, can let multiple clamping sliding blocks synchronous action, ensures each copper wire stress uniformity, further promotes the stability of clamping, for the adaptability of multiple copper wire, the arc sliding mouth of equidistance that rotating round plate is opened on circumference, cooperates the clamping sliding block of circumference distribution on three -way slide rail, can simultaneously carry out clamping to multiple copper wire.

Description

Technical Field

[0001] This utility model relates to the field of cable production equipment technology, specifically a copper wire stranding device for cable production. Background Technology

[0002] In the cable production process, copper wire stranding is a crucial step, as its quality directly affects the cable's conductivity, mechanical strength, and service life.

[0003] Currently, traditional copper wire stranding devices suffer from several problems in practical applications: Firstly, traditional devices have low positioning accuracy for the copper wires, leading to positional deviations during stranding of multiple strands, resulting in a loose and uneven cable structure. Secondly, insufficient clamping stability of the copper wires causes them to loosen or even fall off during high-speed stranding, impacting production efficiency and wasting materials. Thirdly, the lack of effective limiting and guiding structures during stranding makes radial offset difficult to guarantee coaxiality, resulting in inconsistent product quality and failing to meet high-standard cable production requirements. Furthermore, traditional devices lack adjustment flexibility. When producing cables of different specifications (e.g., different numbers of strands, different diameters), significant time is required for disassembly and component replacement, severely impacting production efficiency and hindering the adaptability to the diverse, small-batch production demands of modern cable manufacturing. Therefore, developing a copper wire stranding device that can improve positioning accuracy, enhance clamping stability, ensure stranding coaxiality, and is flexible in adjustment and easy to operate has become an urgent problem to be solved in the current cable production field. Utility Model Content

[0004] The purpose of this utility model is to provide a copper wire stranding device for cable production, which solves the technical problems of low copper wire stranding positioning accuracy, poor clamping stability of multi-strand copper wires, radial displacement during stranding leading to uneven product quality, and insufficient device adjustment flexibility in traditional copper wire stranding devices. It achieves the purpose of improving copper wire stranding positioning accuracy and clamping stability, ensuring stranding coaxiality to improve product quality consistency, and enhancing the device's adaptability to copper wires of different specifications.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a copper wire stranding device for cable production, comprising a supporting base plate, a stranding frame movement adjustment part, and a copper wire stranding clamping part, wherein supporting fixing legs are symmetrically fixedly installed on the bottom outer wall of the supporting base plate; the stranding frame movement adjustment part is disposed on the top of the supporting base plate; and the copper wire stranding clamping part is disposed on the top of the supporting base plate and on one side of the stranding frame movement adjustment part.

[0006] Preferably, the stranding frame moving adjustment part specifically includes: a support fixing plate, which is fixedly installed on the top outer wall of the support base plate; a drive motor, which is fixedly installed on the outer wall of the support base plate; and a slide rail, which is fixedly installed on the top outer wall of the support base plate.

[0007] Preferably, guide slide rods are symmetrically fixed between the support fixing plate and the support base plate, and a threaded screw is fixedly connected to the output end of the drive motor. The other end of the threaded screw movably passes through the outer wall of the slide rail and extends into the interior of the slide rail. The other end of the threaded screw is rotatably connected to the inner wall of the slide rail.

[0008] A drive motor is installed, and the power provided by the drive motor is transmitted to the slider via a threaded screw. The sliding fit between the slider and the slide rail, and the nesting relationship between the rectangular block and the guide rod, form a double guiding and limiting structure, effectively preventing deviation, shaking, or jamming during movement. Even during high-speed twisting or long-term operation, the smoothness of component movement is maintained, reducing problems such as loose copper wires and irregular twisting caused by mechanical vibration.

[0009] Preferably, a slider is slidably installed inside the slide rail, the slider has a threaded hole, the slider is threaded to a threaded screw through the threaded hole, a movable support plate is fixedly installed on the top outer wall of the slider, and rectangular blocks are symmetrically fixedly installed on the bottom outer wall of the movable support plate, each of the rectangular blocks has a sliding hole.

[0010] Preferably, the rectangular block is movably fitted onto the outer wall of the guide slide rod through a sliding hole, a fixing frame is fixedly installed on the outer wall of the support fixing plate, a rotating motor is fixedly installed inside the fixing frame, and the output end of the rotating motor movably passes through one side of the outer wall of the support fixing plate and extends to the other side of the outer wall of the support fixing plate.

[0011] A rotary motor is installed, directly providing driving force for the copper wire stranding process. Through power transmission at the output end, it drives related components to achieve continuous and stable rotational motion. This power output method ensures uniform speed during stranding, preventing inconsistent copper wire stranding pitch due to power fluctuations. This ensures a neat and uniform cable structure after stranding. The fixed cooperation between the rotary motor and supporting mounting plates, frames, and other components forms a stable power output foundation, ensuring precise power transmission to subsequent stranding mechanisms. This linkage structure reduces power loss, improves energy transfer efficiency, enables rapid stranding response, and can adapt to stranding operations with different speed requirements, thereby increasing production efficiency.

[0012] Preferably, the copper wire stranding clamping part specifically includes: a mounting frame, disposed on one side of the support fixing plate; a rotation limiting plate, fixedly installed on the top outer wall of the support base plate; a guide limiting plate, symmetrically fixedly installed on the outer wall of the support fixing plate; and a cover plate, disposed on the top of the support base plate.

[0013] Preferably, a fixed circular plate is fixedly installed on one side of the mounting frame, and a guide groove is provided on the fixed circular plate. A rotating motor is fixedly installed inside the mounting frame. The output end of the rotating motor movably passes through the outer wall of one side of the fixed circular plate and extends to the outer wall of the other side of the fixed circular plate. The rotation limiting plate and the guide limiting plate are adapted to the guide groove. The output end of the rotating motor is fixedly connected to the rotating circular plate.

[0014] Preferably, the rotating circular plate has arc-shaped sliding openings equidistantly spaced on its circumference. A shaft is fixedly installed on the outer wall of the rotating circular plate. A three-way slide rail is provided on one side of the outer wall of the rotating circular plate. Fixed legs are fixedly installed equidistantly on the outer wall of the three-way slide rail. The three-way slide rail is fixedly installed on the outer wall of the fixed circular plate through the fixed legs. A rotating hole is provided on the three-way slide rail. The shaft is adapted to the rotating hole. A clamping slider is slidably installed inside the three-way slide rail. A sliding rod is rotatably connected to the bottom outer wall of the clamping slider. An opening is provided on the inner wall of the three-way slide rail. The sliding rod is adapted to the arc-shaped sliding opening through the opening. The cover plate is fixedly installed on the outer wall of the three-way slide rail.

[0015] A three-way slide rail is incorporated. From the perspective of copper wire positioning, the three-way slide rail adopts a circumferentially distributed structure design, enabling circumferential positioning of multiple copper wires. This ensures that each wire maintains a uniform spacing during the twisting process, laying the foundation for stable subsequent twisting and effectively avoiding loose twisting or irregular structures caused by uneven wire distribution. In terms of synchronous drive, the three-way slide rail works seamlessly with the arc-shaped sliding opening on the rotating plate and the sliding rod at the bottom of the clamping slider. When the rotating plate rotates, the arc-shaped sliding opening drives the clamping slider to slide synchronously within the three-way slide rail via the sliding rod, achieving coordinated operation of multiple clamping structures. This coordinated method ensures that all clamped copper wires can be wound and twisted at a uniform rhythm, resulting in uniform force on the copper wires during twisting and significantly reducing the probability of wire breakage due to uneven force.

[0016] This utility model provides a copper wire stranding device for cable production. It has the following beneficial effects: (1) This utility model drives the screw rod to rotate via a drive motor. The slider is connected to the screw rod via a threaded hole, enabling smooth and precise movement within the slide rail. This screw drive method allows for fine adjustment of the position of the moving support plate, ensuring that the stranding frame can accurately reach the required working position, providing a precise positioning basis for copper wire stranding, and effectively avoiding stranding quality problems caused by positional deviation.

[0017] (2) This utility model can form a stable clamping of copper wire by cooperating with the three-way slide rail and the clamping slider. When the clamping slider slides in the three-way slide rail, it is limited and guided by the slide rail, which prevents the copper wire from loosening or deviating during the twisting process. At the same time, the linkage design of the rotating circular plate, the arc-shaped sliding mouth, and the sliding rod can enable multiple sets of clamping sliders to move synchronously, ensuring that each strand of copper wire is subjected to uniform force, which further improves the stability of clamping. For the adaptability of multiple strands of copper wire, the arc-shaped sliding mouth opened at equal intervals on the circumference of the rotating circular plate, together with the clamping sliders distributed on the circumference of the three-way slide rail, can clamp multiple strands of copper wire at the same time. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a partial view of the moving and adjusting part of the strand frame of this utility model; Figure 3 This is a partial view of the copper wire stranding clamping part of this utility model; Figure 4 This is a partial view of the clamping slider of this utility model.

[0019] In the diagram: 1 Support base plate, 2 Support fixed leg, 3 Twisted wire frame moving adjustment part, 311 Support fixed plate, 312 Drive motor, 313 Slide rail, 314 Threaded screw, 315 Guide slide rod, 316 Rectangular block, 317 Slider, 318 Moving support plate, 319 Fixed frame, 3111 Rotating motor, 4 Copper wire stranding clamping part, 411 Mounting frame, 412 Rotating motor, 413 Fixed circular plate, 414 Guide slide groove, 415 Guide limit plate, 416 Rotation limit plate, 417 Rotating circular plate, 418 Cover plate, 419 Shaft, 4111 Three-way slide rail, 4112 Fixed leg, 4113 Clamping slider. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention. Example

[0022] Addressing the problems of low positioning accuracy, poor stability of multi-strand copper wire clamping, uneven product quality due to radial displacement during stranding, and insufficient adjustment flexibility in existing traditional copper wire stranding devices, this utility model provides a preferred embodiment of a copper wire stranding device for cable production, for example... Figure 1-4 As shown: A copper wire stranding device for cable production includes a support base plate 1, a stranding frame movement adjustment part 3, and a copper wire stranding clamping part 4. Supporting fixed legs 2 are symmetrically fixedly installed on the bottom outer wall of the support base plate 1; the stranding frame movement adjustment part 3 is disposed on the top of the support base plate 1; and the copper wire stranding clamping part 4 is disposed on the top of the support base plate 1 and on one side of the stranding frame movement adjustment part 3.

[0023] The stranding frame moving adjustment part 3 specifically includes: a support fixing plate 311, which is fixedly installed on the top outer wall of the support base plate 1; a drive motor 312, which is fixedly installed on the outer wall of the support base plate 1; and a slide rail 313, which is fixedly installed on the top outer wall of the support base plate 1.

[0024] Guide rods 315 are symmetrically fixed between the support plate 311 and the support base plate 1. A threaded screw 314 is fixedly connected to the output end of the drive motor 312. The other end of the threaded screw 314 movably passes through the outer wall of the slide rail 313 and extends into the interior of the slide rail 313. The other end of the threaded screw 314 is rotatably connected to the inner wall of the slide rail 313.

[0025] The slide rail 313 has a slider 317 slidably installed inside. The slider 317 has a threaded hole and is threadedly connected to the threaded screw 314 through the threaded hole. The top outer wall of the slider 317 is fixedly installed with a movable support plate 318. The bottom outer wall of the movable support plate 318 is symmetrically fixedly installed with rectangular blocks 316, each of which has a sliding hole.

[0026] The rectangular block 316 is movably fitted onto the outer wall of the guide slide rod 315 through the sliding hole. A fixing frame 319 is fixedly installed on the outer wall of the support fixing plate 311. A rotating motor 3111 is fixedly installed inside the fixing frame 319. The output end of the rotating motor 3111 movably passes through one side of the outer wall of the support fixing plate 311 and extends to the other side of the outer wall of the support fixing plate 311.

[0027] In this embodiment, the drive motor 312 is started, driving the threaded screw 314 to rotate within the slide rail 313. The slider 317 slides along the threaded screw 314 through the threaded hole, while the rectangular block 316 moves synchronously along the guide slide rod 315, adjusting the moving support plate 318 to the appropriate wire feeding position. Multiple copper wires are then passed through the clamping area of ​​the copper wire stranding clamping part 4. The copper wires pass sequentially through the rotation limit plate 416 and the guide limit plate 415, and are finally introduced into the clamping slider 4113 within the three-way slide rail 4111, initially positioning the copper wires. This allows for smooth and precise movement within the slide rail. This screw drive method allows for fine adjustment of the position of the moving support plate, ensuring that the stranding frame accurately reaches the required working position, providing a precise positioning basis for copper wire stranding, and effectively avoiding stranding quality problems caused by positional deviations. Example

[0028] Based on Embodiment 1, a preferred embodiment of the copper wire stranding device for cable production provided by this utility model is, for example... Figure 1-4 As shown: The copper wire stranding clamping part 4 specifically includes: a mounting bracket 411, which is disposed on one side of the support fixing plate 311; a rotation limiting plate 416, which is fixedly installed on the top outer wall of the support base plate 1; a guide limiting plate 415, which is symmetrically fixedly installed on the outer wall of the support fixing plate 311; and a cover plate 418, which is disposed on the top of the support base plate 1.

[0029] A fixed circular plate 413 is fixedly installed on one side of the mounting bracket 411. A guide groove 414 is provided on the fixed circular plate 413. A rotary motor 412 is fixedly installed inside the mounting bracket 411. The output end of the rotary motor 412 moves through one side of the outer wall of the fixed circular plate 413 and extends to the other side of the outer wall of the fixed circular plate 413. The rotation limit plate 416 and the guide limit plate 415 are adapted to the guide groove 414. The output end of the rotary motor 412 is fixedly connected to the rotary circular plate 417.

[0030] The rotating circular plate 417 has arc-shaped sliding openings equidistantly on its circumference. A shaft 419 is fixedly installed on the outer wall of the rotating circular plate 417. A three-way slide rail 4111 is provided on one side of the outer wall of the rotating circular plate 417. Fixed legs 4112 are fixedly installed equidistantly on the outer wall of the three-way slide rail 4111. The three-way slide rail 4111 is fixedly installed on the outer wall of the fixed circular plate 413 through the fixed legs 4112. A rotating hole is provided on the three-way slide rail 4111. The shaft 419 is adapted to the rotating hole. A clamping slider 4113 is slidably installed inside the three-way slide rail 4111. A sliding rod is rotatably connected to the bottom outer wall of the clamping slider 4113. An opening is provided on the inner wall of the three-way slide rail 4111. The sliding rod is adapted to the arc-shaped sliding opening through the opening. A cover plate 418 is fixedly installed on the outer wall of the three-way slide rail 4111.

[0031] In this embodiment, the rotating motor 412 of the copper wire stranding clamping part 4 is started, and its output end drives the rotating disc 417 to start rotating. The arc-shaped sliding opening on the rotating disc 417 engages with the sliding rod at the bottom of the clamping slider 4113 through the through-hole. As the rotating disc 417 rotates, the sliding rod slides along the arc-shaped sliding opening, causing the clamping slider 4113 to synchronously retract towards the center within the three-way slide rail 4111 until it tightly clamps each strand of copper wire. The clamping status is checked to ensure that all copper wires are evenly stressed and there is no loosening or displacement. At this time, the shaft 419 rotates with the rotation in the rotating hole of the three-way slide rail 4111. The rotating circular plate 417 rotates synchronously to ensure structural stability and form a firm clamping effect on the copper wire. When the clamping slider slides within the three-way slide rail, it is limited and guided by the slide rail to prevent the copper wire from loosening or shifting during the twisting process. At the same time, the linkage design of the rotating circular plate, the arc-shaped sliding mouth, and the sliding rod allows multiple sets of clamping sliders to move synchronously, ensuring that each strand of copper wire is subjected to uniform force, further improving the stability of clamping. For the adaptability of multiple strands of copper wire, the arc-shaped sliding mouths equidistantly opened on the circumference of the rotating circular plate, together with the clamping sliders distributed on the circumference of the three-way slide rail, can clamp multiple strands of copper wire simultaneously.

[0032] Working principle: Step 1: Check the status of each component of the device to ensure that the support base plate 1 is placed stably by the support fixing leg 2, and that the stranding frame moving adjustment part 3 and the copper wire stranding clamping part 4 are firmly connected. According to the specifications, quantity and diameter of the copper wire to be stranded, adjust the position of the moving support plate 318 through the stranding frame moving adjustment part 3. Start the drive motor 312 to drive the threaded screw 314 to rotate in the slide rail 313. The slider 317 slides along the threaded screw 314 through the threaded hole. At the same time, the rectangular block 316 moves synchronously along the guide slide rod 315. Adjust the moving support plate 318 to the appropriate wire feeding position. Pass the multiple copper wires through the clamping area of ​​the copper wire stranding clamping part 4. Let the copper wire pass through the rotation limit plate 416 and the guide limit plate 415 in sequence, and finally be introduced into the clamping slider 4113 in the three-way slide rail 4111 to initially locate the position of the copper wire. Step 2: Start the rotating motor 412 of the copper wire stranding clamping part 4. Its output end drives the rotating disc 417 to start rotating. The arc-shaped sliding mouth on the rotating disc 417 cooperates with the sliding rod at the bottom of the clamping slider 4113 through the through-hole. As the rotating disc 417 rotates, the sliding rod slides along the arc-shaped sliding mouth, causing the clamping slider 4113 to synchronously contract towards the center in the three-way slide rail 4111 until it tightly clamps each strand of copper wire. Check the clamping status to ensure that all copper wires are evenly stressed and there is no loosening or deviation. At this time, the shaft 419 rotates synchronously with the rotating disc 417 in the rotating hole of the three-way slide rail 4111 to ensure structural stability. Step 3: According to the stranding process requirements, adjust the rotation parameters on one side of the support plate 311 by the rotating motor 3111 on the fixed frame 319 to ensure that the initial angle of the fixed circular plate 413 meets the stranding requirements. The guide groove 414 on the fixed circular plate 413 cooperates with the guide limit plate 415 and the rotation limit plate 416 to pre-position the rotation trajectory of the fixed circular plate 413 and avoid radial offset during the stranding process. Step 4: Start the rotating motor 3111 and the rotating motor 412 to make the fixed circular plate 413 and the rotating circular plate 417 rotate synchronously at a preset speed: the fixed circular plate 413 drives the three-way slide rail 4111 to rotate as a whole through the fixed leg 4112, and the rotating circular plate 417 continuously drives the clamping slider 4113 to maintain the clamping state and rotate with the whole. During the rotation, each copper wire is wrapped and twisted along the preset trajectory under the constraint of the clamping slider 4113. The guide limit plate 415 and the rotating limit plate 416, through cooperation with the guide slide groove 414, always limit the shaking of the fixed circular plate 413 and ensure the coaxiality of the twisting. Step 5: After the copper wire stranding length reaches the set value, first turn off the rotating motor 3111 and the rotating motor 412 to gradually stop the movement of each rotating component. Then, start the rotating motor 412 in reverse to drive the rotating disc 417 to rotate in the opposite direction, so that the clamping slider 4113 slides outward in the three-way slide rail 4111 to release the stranded copper wire. Then, start the drive motor 312 to run in reverse, and drive the moving support plate 318 to reset through the threaded screw 314. Remove the stranded copper wire, check the protective status of the cover plate 418 on the three-way slide rail 4111, and complete one stranding cycle.

[0033] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model 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 this utility model should be included within the protection scope of this utility model.

Claims

1. A copper wire stranding device for cable production, comprising a supporting base plate (1), a stranding frame adjustment part (3), and a copper wire stranding clamping part (4), characterized in that: The bottom outer wall of the support base plate (1) is symmetrically fixed with support fixing legs (2); the stranding frame moving adjustment part (3) is set on the top of the support base plate (1); the copper wire stranding clamping part (4) is respectively set on the top of the support base plate (1) and on one side of the stranding frame moving adjustment part (3).

2. The copper wire stranding device for cable production according to claim 1, characterized in that: The strand frame moving adjustment part (3) specifically includes: The support fixing plate (311) is fixedly installed on the top outer wall of the support base plate (1); The drive motor (312) is fixedly installed on the outer wall of the support base plate (1); The slide rail (313) is fixedly installed on the top outer wall of the support base plate (1).

3. The copper wire stranding device for cable production according to claim 2, characterized in that: Guide slide rods (315) are symmetrically fixed between the support fixing plate (311) and the support base plate (1). The output end of the drive motor (312) is fixedly connected to a threaded screw (314). The other end of the threaded screw (314) movably passes through the outer wall of the slide rail (313) and extends into the interior of the slide rail (313). The other end of the threaded screw (314) is rotatably connected to the inner wall of the slide rail (313).

4. A copper wire stranding device for cable production according to claim 3, characterized in that: The slide rail (313) has a slider (317) slidably installed inside. The slider (317) has a threaded hole and is threadedly connected to the threaded screw (314) through the threaded hole. A movable support plate (318) is fixedly installed on the top outer wall of the slider (317). Rectangular blocks (316) are symmetrically fixedly installed on the bottom outer wall of the movable support plate (318). Each rectangular block (316) has a sliding hole.

5. A copper wire stranding device for cable production according to claim 4, characterized in that: The rectangular block (316) is movably sleeved on the outer wall of the guide slide rod (315) through the sliding hole. A fixing frame (319) is fixedly installed on the outer wall of the support fixing plate (311). A rotating motor (3111) is fixedly installed inside the fixing frame (319). The output end of the rotating motor (3111) movably passes through one side of the outer wall of the support fixing plate (311) and extends to the other side of the outer wall of the support fixing plate (311).

6. A copper wire stranding device for cable production according to claim 1, characterized in that: The copper wire stranding clamping part (4) specifically includes: The mounting bracket (411) is located on one side of the support fixing plate (311); Rotate the limiting plate (416), which is fixedly installed on the top outer wall of the support base plate (1); The guide limit plate (415) is symmetrically fixedly installed on the outer wall of the support fixing plate (311); A cover plate (418) is provided on top of the supporting base plate (1).

7. A copper wire stranding device for cable production according to claim 6, characterized in that: A fixed circular plate (413) is fixedly installed on one side of the mounting bracket (411). A guide groove (414) is provided on the fixed circular plate (413). A rotating motor (412) is fixedly installed inside the mounting bracket (411). The output end of the rotating motor (412) moves through one side of the outer wall of the fixed circular plate (413) and extends to the other side of the outer wall of the fixed circular plate (413). The rotating limiting plate (416) and the guide limiting plate (415) are adapted to the guide groove (414). The output end of the rotating motor (412) is fixedly connected to the rotating circular plate (417).

8. A copper wire stranding device for cable production according to claim 7, characterized in that: The rotating circular plate (417) has arc-shaped sliding openings equidistantly spaced on its circumference. A shaft (419) is fixedly installed on the outer wall of the rotating circular plate (417). A three-way slide rail (4111) is provided on one side of the outer wall of the rotating circular plate (417). Fixed legs (4112) are fixedly installed equidistantly on the outer wall of the three-way slide rail (4111). The three-way slide rail (4111) is fixedly installed on the outer wall of the fixed circular plate (413) via the fixed legs (4112). A rotating hole is provided on the three-way slide rail (4111). The shaft (419) is adapted to the rotating hole. A clamping slider (4113) is slidably installed inside the three-way slide rail (4111). A sliding rod is rotatably connected to the bottom outer wall of the clamping slider (4113). An opening is provided on the inner wall of the three-way slide rail (4111). The sliding rod is adapted to the arc-shaped sliding opening through the opening. The cover plate (418) is fixedly installed on the outer wall of the three-way slide rail (4111).

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