Automatic screw mounting device

Abstract

The invention relates to the technical field of screw installation, and discloses an automatic screw installation device which comprises a workbench and further comprises an installation mechanism, the top of the workbench is fixedly connected with a moving device, the installation mechanism comprises a movable seat, and the outer wall of the moving device is movably connected with the movable seat; a first connecting plate is fixedly connected to the side, away from the moving device, of the movable base, a first motor is fixedly connected to the top of the first connecting plate, a cylinder is rotationally connected to the inner wall of the first connecting plate through a bearing, and after a screw is adsorbed to a drill bit, the periphery of the screw can be centered and fixed, so that the screw can be conveniently and rapidly fixed, and the service life of the screw is prolonged. Under the combined action of the drill bit and the fixing head, the screw can be arranged in the center of the second shell in a vertical state, so that the screw can be prevented from falling off when equipment moves, it can be guaranteed that the screw enters at a correct angle when the screw is installed, and normal operation of the equipment is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of screw installation, in particular to an automatic screw installation device. Background Art

[0002] A screw is a common fastener, usually consisting of a head and a shank. The head of a screw has various shapes, such as round, hexagonal, pan head, countersunk head, etc. Different head shapes are suitable for different usage scenarios and tool operation requirements. The shank of a screw is generally cylindrical with threads on the surface. The shape and specification of the threads determine the screw's fastening ability and scope of application.

[0003] The patent application with application number CN202310553875.3 discloses an automatic screw installation device, including a frame, a tooling and a clamping mechanism arranged on the frame, a pressing plate arranged on the clamping mechanism, a pressing block arranged on the pressing plate, and the clamping mechanism drives the pressing block to press down the end of the wire harness through the pressing plate; it also includes a nail supply mechanism, a three-axis driving mechanism and a nailing mechanism arranged on the frame, the nail supply mechanism transports the screws to a designated area, the three-axis driving mechanism drives the nailing mechanism to move to the designated area, the nailing mechanism absorbs the screws, the three-axis driving mechanism drives the nailing mechanism to move above the wire harness assembly, and the nailing mechanism drives the screws into the wire harness assembly.

[0004] During use, the existing equipment will absorb the screw onto the drill bit and then nail it to the location where it needs to be installed. However, the current equipment lacks effective fixation of the screw, which causes the screw to easily deviate in angle during installation, resulting in poor installation effect of the screw. Summary of the invention

[0005] The object of the present invention is to provide a screw automatic installation device to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: an automatic screw installation device, comprising a workbench, a moving device is fixedly connected to the top of the workbench, and further comprising:

[0007] The mounting mechanism comprises a movable seat, an outer wall of the movable device is movably connected to the movable seat, a side of the movable seat away from the movable device is fixedly connected with a connecting plate 1, the top of the connecting plate 1 is fixedly connected with a motor 1, a cylinder is selected by the motor 1, and then the position of the impact column and the rotating assembly is controlled, the inner wall of the connecting plate 1 is rotatably connected with the cylinder through a bearing, the output end of the motor 1 is fixedly connected to the cylinder, the outer wall of the cylinder is fixedly connected with a connecting column, the inner wall of the connecting column is fixedly connected with a push rod 1, and the bottom of the push rod 1 is fixedly connected with an impact column. Before the screw is installed to the plate, the plate will be firstly fixedly operated, and a groove or a round hole will be struck on the surface of the plate by using the push rod 1 and the impact column so that the screw can enter smoothly, so as to avoid slipping during the installation of the screw due to the surface of the plate being too flat, thereby affecting the installation effect of the screw, the outer wall of the connecting column is also fixedly connected with an annular plate, the inner wall of the bottom of the annular plate is fixedly connected with a rotating assembly, the inner wall of the annular plate is fixedly connected with an intermediate plate, and the inner wall of the intermediate plate is fixedly connected with motor 2.

[0008] According to the above technical solution, the rotating assembly includes a housing 1, the outer wall of the housing 1 is rotatably connected to the annular plate through a bearing, the output end of the motor 2 is fixedly connected to the housing 1, the inner wall of the housing 1 is fixedly connected to the housing 2, and the bottom of the housing 2 is rotatably connected to a rotating ring through a bearing. When the device is screwed, both the housing 1 and the housing 2 are in a rotating state. If the housing 2 directly contacts the plate, the surface of the plate will be damaged. Therefore, an intermediate object is set between the housing 2 and the plate through the rotating ring to ensure that the housing 2 will not damage the plate.

[0009] According to the above technical solution, the inner wall of the second shell is fixedly connected with a connecting plate 2, the outer wall of the second connecting plate is provided with a slide groove 1, the inner side of the second connecting plate is fixedly connected with a ramp plate, and the position of the fixing component is controlled by the ramp plate. At the same time, since the top of the ramp plate is in a vertical state, the fixing component will still fix the screw when the screw is just installed, so as to avoid the front end of the screw losing fixation before it is completely embedded in the plate, resulting in deviation in the installation of the screw. The top of the second shell is fixedly connected with a push rod 2, and the height of the movable component is controlled by the push rod 2. The bottom of the push rod 2 is fixedly connected with the movable component, and the inner wall of the second shell is movably connected with a pressure component.

[0010] According to the above technical solution, the movable component includes an upper plate, the bottom of the push rod 2 is fixedly connected to the upper plate, both ends of the upper plate are fixedly connected with a slider 1, the outer wall of the slider 1 is movably connected to a slide groove 1, and the bottom of the upper plate is fixedly connected with a connecting plate 3.

[0011] According to the above technical solution, the bottom of the connecting plate three is fixedly connected to the lower plate, both ends of the lower plate are provided with a slide groove two, the inner wall of the slide groove two is movably connected to a fixed component, and the inner wall of the slide groove two is fixedly connected to an elastic component one.

[0012] The cam is connected to the upper and lower plates by the spring, and the cam is connected to the lower plates by the spring.

[0013] According to the above technical solution, the pressure assembly includes a sliding column 1, the outer wall of the sliding column 1 is movably connected to the outer shell 2, the top of the sliding column 1 is fixedly connected to a triangular plate 1, the inner wall of the triangular plate 1 is fixedly connected to a push rod 3, wherein the push rod 3 has three states, when the push rod 3 is contracted, the sliding column 2 will be directly pulled up, when the push rod 3 is in a half-expanded state, the movement of the sliding column 2 will not be affected by the slider 3 on the push rod 3, when the push rod 3 is fully expanded, the sliding column 2 will be completely pushed out, and the bottom of the push rod 3 is fixedly connected to the slider 3.

[0014] According to the above technical solution, the bottom of the sliding column one is fixedly connected to the triangular plate two, the bottom of the triangular plate two is fixedly connected to the upper plate, the inner wall of the triangular plate two is movably connected to the sliding column two, the top of the sliding column two is fixedly connected to the circular plate, the outer wall of the sliding column two is sleeved with a spring, the top of the spring is fixedly connected to the circular plate, the bottom of the spring is fixedly connected to the triangular plate two, the outer wall of the bottom of the sliding column two is fixedly connected to a limiting ring, the bottom of the sliding column two is fixedly connected to a magnetic head, a sliding hole is opened on the top of the circular plate, the sliding hole passes through the circular plate and extends to the interior of the sliding column two, and the inner wall of the sliding hole is movably connected to the slider three.

[0015] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0016] 1. The present invention sets a movable component, and after the screw is adsorbed on the drill bit, the surrounding of the screw will be fixed in the center. In this way, under the joint action of the drill bit and the fixing head, the screw can be placed in the center of the shell 2 in a vertical state. This can prevent the screw from falling off when the device is moved, and ensure that the screw is installed at the correct angle, thereby ensuring the normal operation of the device.

[0017] 2. The present invention sets a fixed component, and as the movable component moves up and down, the position of the fixed component of the device will be adjusted. When the movable component is at the top, the screw will be fixed to ensure the vertical state of the screw. When the movable component is at the bottom, the screw will be loosened so that there is no obstruction under the screw head, thereby ensuring that the screw can be installed normally.

[0018] 3. The present invention sets a pressure component. When the device fixes the screw, it will apply pressure to the top of the screw. In this way, the head of the screw will be clamped between the fixing head and the magnetic head, thereby further improving the fixing effect of the device on the screw. When the screw drops, the magnetic head will give the screw a downward force, thereby improving the installation efficiency of the screw.

[0019] 4. The present invention sets up an installation mechanism. Before installing the screws to the plate, the plate will be first fixed-point operated, and a groove or a round hole will be hit on the surface of the plate by using a push rod and an impact column so that the screw can enter smoothly, avoiding slipping during the installation of the screw due to the surface of the plate being too flat, thereby affecting the installation effect of the screw. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 is a schematic diagram of the installation mechanism of the present invention;

[0023] Figure 3 is a schematic diagram of a rotating assembly of the present invention;

[0024] Figure 4 is a cross-sectional view of a rotating assembly of the present invention;

[0025] Figure 5 is a cross-sectional view of the internal structure of the second housing of the present invention;

[0026] Figure 6 is a schematic diagram of the active components of the present invention;

[0027] Figure 7 It is a schematic diagram of the external parts of the movable assembly of the present invention;

[0028] Figure 8 is a schematic diagram of a fixing assembly of the present invention;

[0029] Fig. 9 is a schematic diagram of a pressure assembly of the present invention;

[0030] Fig.10 is a cross-sectional view of a pressure assembly of the present invention;

[0031] In the figure: 1, workbench; 101, moving device; 2, mounting mechanism; 201, movable seat; 202, connecting plate 1; 203, motor 1; 204, cylinder; 205, connecting column; 206, push rod 1; 207, impact column; 208, annular plate; 209, middle plate; 2010, motor 2; 21, rotating assembly; 211, housing 1; 212, housing 2; 213, rotating ring; 214, connecting plate 2; 215, slide 1; 216, ramp plate; 217, push rod 2; 22, movable assembly; 221, slider 1; 222, upper plate ; 223, connecting plate three; 224, lower plate; 225, slide groove two; 226, elastic component one; 23, fixed component; 231, slider two; 232, connecting plate four; 233, fixed head; 234, elastic component two; 235, U-shaped plate; 236, pressure roller; 24, pressure component; 241, sliding column one; 242, triangular plate one; 243, push rod three; 244, slider three; 245, triangular plate two; 246, sliding column two; 247, limiting ring; 248, magnetic head; 249, round plate; 2410, spring; 2411, sliding hole. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0033] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0034] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Example 1: See Figure 1-Figure 2 The present invention provides a technical solution: an automatic screw installation device, comprising a workbench 1, a mobile device 101 is fixedly connected to the top of the workbench 1, and further comprising:

[0036] The mounting mechanism 2 includes a movable seat 201, an outer wall of the moving device 101 is movably connected to the movable seat 201, a connecting plate 202 is fixedly connected to the side of the movable seat 201 away from the moving device 101, a motor 203 is fixedly connected to the top of the connecting plate 202, a cylinder 204 is rotatably connected to the inner wall of the connecting plate 202 through a bearing, an output end of the motor 203 is fixedly connected to the cylinder 204, a connecting column 205 is fixedly connected to the outer wall of the cylinder 204, a push rod 206 is fixedly connected to the inner wall of the connecting column 205, an impact column 207 is fixedly connected to the bottom of the push rod 206, an annular plate 208 is also fixedly connected to the outer wall of the connecting column 205, a rotating assembly 21 is fixedly connected to the inner wall of the bottom of the annular plate 208, an intermediate plate 209 is fixedly connected to the inner wall of the intermediate plate 209, and a motor 2010 is fixedly connected to the inner wall of the intermediate plate 209.

[0037] The working principle of this embodiment is as follows: when the screw needs to be installed, first fix the screw in the rotating component 21, then start the motor 203 to drive the cylinder 204 to rotate, and the rotating cylinder 204 drives the push rod 206 and the impact column 207 to be above the installation position through the connecting column 205, and then start the push rod 206 to drive the impact column 207 to position the plate, and then start the motor 203 again to reset the installation mechanism 2, and move the installation mechanism 2 downward through the moving device 101 until the bottom of the rotating component 21 contacts the plate, and then start the motor 2 2010 to drive the rotating component 21 to rotate to install the screw.

[0038] Example 2: Based on Example 1, please refer to Figure 3-Figure 8The rotating component 21 includes a shell 211, the outer wall of the shell 211 is rotatably connected to the annular plate 208 through a bearing, the output end of the motor 2010 is fixedly connected to the shell 211, the inner wall of the shell 211 is fixedly connected to the shell 212, the bottom of the shell 212 is rotatably connected to the rotating ring 213 through a bearing, the inner wall of the shell 212 is fixedly connected to the connecting plate 214, the outer wall of the connecting plate 214 is provided with a slide groove 215, the inner side of the connecting plate 214 is fixedly connected to the ramp plate 216, the top of the shell 212 is fixedly connected to the push rod 217, the bottom of the push rod 217 is fixedly connected to the movable component 22, and the inner wall of the shell 212 is movably connected to the pressure component 24.

[0039] The movable component 22 includes an upper plate 222, and the bottom of the push rod 217 is fixedly connected to the upper plate 222. Both ends of the upper plate 222 are fixedly connected with a slider 221. The outer wall of the slider 221 is movably connected to the slide groove 215. The bottom of the upper plate 222 is fixedly connected with a connecting plate 3 223, and the bottom of the connecting plate 3 223 is fixedly connected with a lower plate 224. Both ends of the lower plate 224 are provided with a slide groove 225. The inner wall of the slide groove 225 is movably connected with the fixed component 23, and the inner wall of the slide groove 225 is fixedly connected with an elastic component 1 226. Before installing the screw, the screw will be installed in the rotating component first. At this time, after the screw is adsorbed on the pressure component, the push rod 2 is started to drive the movable component and the pressure component to rise together. As the movable component rises, the fixed component moves inward under the pressure of the ramp plate to fix the screw.

[0040] The fixed component 23 includes a slider 231, the outer wall of the slider 231 is movably connected to the slide groove 225, the outer wall of the slider 231 is fixedly connected to the elastic component 1 226, the outer wall of the slider 231 is fixedly connected to a connecting plate 4 232, the outer wall of the connecting plate 4 232 is movably connected to the lower plate 224, the end of the connecting plate 4 232 away from the slider 231 is fixedly connected to a fixing head 233, the side of the fixing head 233 close to the slider 231 is fixedly connected to the elastic component 234, the end of the elastic component 234 away from the fixing head 233 is fixedly connected to a U-shaped plate 235, the outer wall of the U-shaped plate 235 is movably connected to the connecting plate 4 232, the inner wall of the U-shaped plate 235 is rotatably connected to a pressure roller 236 through a bearing, and the outer wall of the pressure roller 236 is movably connected to the ramp plate 216.

[0041] The working principle of this embodiment is as follows: when installing the screws, as the motor 2010 drives the housing 1 211 to rotate, the entire rotating assembly 21 rotates, and then the push rod 217 is started to drive the movable assembly 22 to move downward. The downward movement of the movable assembly 22 will drive the pressure assembly 24 to move downward, and then drive the screw to move downward. At the same time, the moving movable assembly 22 drives the fixed assembly 23 to move downward as well. Since the pressure roller 236 is always in contact with the ramp plate 216 under the action of the elastic assembly 234, at this time, with the change in the position of the ramp plate 216 and the elastic force of the elastic assembly 1 226, the fixed head 233 moves outward to release the fixation of the screw.

[0042] Example 3: Based on Example 2, please refer to Figure 9-10 The pressure assembly 24 includes a sliding column 1 241, the outer wall of the sliding column 1 241 is movably connected to the outer shell 212, the top of the sliding column 1 241 is fixedly connected to a triangular plate 1 242, and the inner wall of the triangular plate 1 242 is fixedly connected to a push rod 3 243. Before installing the screw, the screw needs to be installed in the device. At this time, the push rod 3 243 is in a fully expanded state, allowing the magnetic head 248 to adsorb the screw on the pressure assembly 24, and then the push rod 3 243 moves to a retracted state. At this time, the push rod 217 is started again to drive the movable assembly 22 to rise and fix the periphery of the screw. When the movable assembly 22 moves to the bottom, the push rod 3 243 moves to a semi-expanded state. At this time, the sliding column 246 loses its support, allowing the screw head to be further fixed under the clamping of the fixed head 233 and the magnetic head 248. The push rod 3 243 The bottom is fixedly connected with a slider three 244, the bottom of the sliding column one 241 is fixedly connected with a triangle plate two 245, the bottom of the triangle plate two 245 is fixedly connected to the upper plate 222, the inner wall of the triangle plate two 245 is movably connected with a sliding column two 246, the top of the sliding column two 246 is fixedly connected with a circular plate 249, the outer wall of the sliding column two 246 is sleeved with a spring 2410, the top of the spring 2410 is fixedly connected to the circular plate 249, the bottom of the spring 2410 is fixedly connected to the triangle plate two 245, the outer wall of the bottom of the sliding column two 246 is fixedly connected with a limiting ring 247, the bottom of the sliding column two 246 is fixedly connected with a magnetic head 248, the top of the circular plate 249 is provided with a sliding hole 2411, the sliding hole 2411 penetrates the circular plate 249 and extends to the interior of the sliding column two 246, the inner wall of the sliding hole 2411 is movably connected with the slider three 244.

[0043] The working principle of this embodiment is as follows: when installing the screws, the push rod three 243 is in a semi-expanded state. As the movable component 22 descends, the screws are driven to descend together through the triangular plate two 245, the spring 2410, the circular plate 249, the sliding column two 246, and the magnetic head 248 to install the screws. When the movable component 22 is at the bottom, the push rod three 243 is started to move the push rod three 243 to a fully expanded state, and then a downward force is applied to the screws so that the screws can be fully embedded in the plate to complete the installation of the screws.

[0044] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0045] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An automatic screw installation device, comprising a workbench (1), wherein a moving device (101) is fixedly connected to the top of the workbench (1), characterized in that: Also includes: The mounting mechanism (2) comprises a movable seat (201), the outer wall of the movable device (101) being movably connected to the movable seat (201), a side of the movable seat (201) away from the movable device (101) being fixedly connected to a connecting plate 1 (202), a top of the connecting plate 1 (202) being fixedly connected to a motor 1 (203), an inner wall of the connecting plate 1 (202) being rotatably connected to a cylinder (204) via a bearing, an output end of the motor 1 (203) being fixedly connected to the cylinder (204), and the cylinder ( The outer wall of the connecting column (204) is fixedly connected to a connecting column (205), the inner wall of the connecting column (205) is fixedly connected to a push rod 1 (206), the bottom of the push rod 1 (206) is fixedly connected to an impact column (207), the outer wall of the connecting column (205) is also fixedly connected to an annular plate (208), the inner wall of the bottom of the annular plate (208) is fixedly connected to a rotating component (21), the inner wall of the annular plate (208) is fixedly connected to an intermediate plate (209), and the inner wall of the intermediate plate (209) is fixedly connected to a motor 2 (2010).

2. The automatic screw installation device according to claim 1, characterized in that: The rotating assembly (21) comprises a first housing (211), the outer wall of the first housing (211) being rotatably connected to the annular plate (208) via a bearing, the output end of the second motor (2010) being fixedly connected to the first housing (211), the inner wall of the first housing (211) being fixedly connected to the second housing (212), and the bottom of the second housing (212) being rotatably connected to a rotating ring (213) via a bearing.

3. The automatic screw installation device according to claim 2, characterized in that: The inner wall of the second shell (212) is fixedly connected to a second connecting plate (214), the outer wall of the second connecting plate (214) is provided with a first sliding groove (215), the inner side of the second connecting plate (214) is fixedly connected to a ramp plate (216), the top of the second shell (212) is fixedly connected to a second push rod (217), the bottom of the second push rod (217) is fixedly connected to a movable component (22), and the inner wall of the second shell (212) is movably connected to a pressure component (24).

4. The automatic screw installation device according to claim 3, characterized in that: The movable component (22) comprises an upper plate (222), the bottom of the push rod 2 (217) is fixedly connected to the upper plate (222), both ends of the upper plate (222) are fixedly connected to a slider 1 (221), the outer wall of the slider 1 (221) is movably connected to the slide groove 1 (215), and the bottom of the upper plate (222) is fixedly connected to a connecting plate 3 (223).

5. The automatic screw installation device according to claim 4, characterized in that: The bottom of the connecting plate three (223) is fixedly connected to a lower plate (224), both ends of the lower plate (224) are provided with a second slide groove (225), the inner wall of the second slide groove (225) is movably connected to a fixed component (23), and the inner wall of the second slide groove (225) is fixedly connected to an elastic component one (226).

6. The automatic screw installation device according to claim 5, characterized in that: The fixing assembly (23) includes a slider 2 (231), the outer wall of the slider 2 (231) is movably connected to the slide groove 2 (225), the outer wall of the slider 2 (231) is fixedly connected to the elastic assembly 1 (226), the outer wall of the slider 2 (231) is fixedly connected to a connecting plate 4 (232), the outer wall of the connecting plate 4 (232) is movably connected to the lower plate (224), and the end of the connecting plate 4 (232) away from the slider 2 (231) is fixedly connected to a fixing head (2 33), a side of the fixed head (233) close to the slider 2 (231) is fixedly connected to an elastic component 2 (234), an end of the elastic component 2 (234) away from the fixed head (233) is fixedly connected to a U-shaped plate (235), an outer wall of the U-shaped plate (235) is movably connected to the connecting plate 4 (232), an inner wall of the U-shaped plate (235) is rotatably connected to a pressure roller (236) via a bearing, and an outer wall of the pressure roller (236) is movably connected to the ramp plate (216).

7. The automatic screw installation device according to claim 6, characterized in that: The pressure assembly (24) comprises a sliding column (241), the outer wall of which is movably connected to the outer shell (212), the top of which is fixedly connected to a triangular plate (242), the inner wall of which is fixedly connected to a push rod (243), and the bottom of which is fixedly connected to a slider (244).

8. The automatic screw installation device according to claim 7, characterized in that: The bottom of the sliding column 1 (241) is fixedly connected to the triangular plate 2 (245), the bottom of the triangular plate 2 (245) is fixedly connected to the upper plate (222), the inner wall of the triangular plate 2 (245) is movably connected to the sliding column 2 (246), the top of the sliding column 2 (246) is fixedly connected to the circular plate (249), the outer wall of the sliding column 2 (246) is sleeved with a spring (2410), the top of the spring (2410) is fixedly connected to the circular plate (249), and the spring (2 The bottom of the circular plate (249) is fixedly connected to the triangle plate (245), the outer wall of the bottom of the sliding column (246) is fixedly connected to a limiting ring (247), the bottom of the sliding column (246) is fixedly connected to a magnetic head (248), the top of the circular plate (249) is provided with a sliding hole (2411), the sliding hole (2411) passes through the circular plate (249) and extends to the interior of the sliding column (246), and the inner wall of the sliding hole (2411) is movably connected to the slider (244).

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