A magnetic removal device for carbon nanotubes

Abstract

The utility model provides a kind of carbon nanotube magnetic removal device, including base and magnetic cylinder, the surface of base is fixedly installed with sleeve, magnetic cylinder can be lifted and slid relative base by sleeve;One end of magnetic cylinder is equipped with auxiliary device, auxiliary device includes the first motor of fixed mounting in one end of magnetic cylinder, the inner wall both ends of magnetic cylinder are rotatably connected with rotating rod, rotating rod is fixedly connected with the output end of first motor, the outer wall of rotating rod is evenly distributed with multiple magnetic bar, the utility model is driven rotating rod and magnetic bar by first motor, so that the magnetic field of magnetic bar is evenly covered in magnetic cylinder, can comprehensively adsorb magnetic impurity in carbon nanotube powder;Second motor drives profile gear and strip frame cooperation simultaneously, drives magnetic cylinder to reciprocate up and down, lets powder constantly sprinkle up and down, greatly increases the contact area of powder and magnetic bar, effectively solve the problem that powder agglomerates in traditional static adsorption, impurity in agglomerate cannot contact magnetic bar.

Description

Technical Field

[0001] This utility model relates to the field of carbon nanotube demagnetization technology, specifically to a demagnetization device for carbon nanotubes. Background Technology

[0002] Carbon nanotubes are widely used in electronic devices, composite materials, and energy storage due to their excellent electrical, mechanical, and thermal properties. However, during the preparation of carbon nanotubes, magnetic impurities are often introduced due to catalyst residues, metal particles generated from equipment wear, and other reasons. These impurities severely affect the purity of the carbon nanotubes, leading to a decline in their performance in downstream applications. Therefore, demagnetizing devices are necessary to remove these impurities.

[0003] Existing demagnetizing devices for carbon nanotubes rely solely on static adsorption. During the demagnetizing process, carbon nanotube powder is prone to agglomeration. Agglomerated magnetic impurities cannot fully contact the magnetic rod, further exacerbating the problem of impurity residue. This directly leads to a low yield of electronic-grade carbon nanotubes, reduces product purity, wastes raw materials, increases economic losses, and restricts overall production efficiency.

[0004] Therefore, there is an urgent need to provide a new solution to address the defects and shortcomings of the existing technologies. Utility Model Content

[0005] The purpose of this invention is to solve the problems mentioned above in the background art by proposing a demagnetizing device for carbon nanotubes.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A demagnetizing device for carbon nanotubes, comprising a base and a magnetic cylinder, characterized in that: A sleeve is fixedly installed on the surface of the base, and the magnetic cylinder can slide up and down relative to the base through the sleeve. An auxiliary device is provided at one end of the magnetic cylinder. The auxiliary device includes a first motor fixedly installed at one end of the magnetic cylinder. Rotating rods are rotatably connected to both ends of the inner wall of the magnetic cylinder. The rotating rods are fixedly connected to the output end of the first motor. Multiple magnetic bars are evenly distributed on the outer wall of the rotating rods.

[0007] As a further preferred embodiment of the present invention, a slide plate is slidably connected to the outer wall of the sleeve, and a strip frame is fixedly installed on the side of the slide plate near the magnetic cylinder.

[0008] As a further preferred embodiment of the present invention, a support rod is fixedly installed on the top of the strip frame, and an arc-shaped bracket is fixedly installed on the end of the support rod away from the strip frame.

[0009] As a further preferred embodiment of the present invention, a vertical plate is fixedly installed on the top of the base, a second motor is fixedly installed on one side of the vertical plate, and a special-shaped gear is fixedly installed on the output end of the second motor.

[0010] As a further preferred embodiment of this utility model, the outer edge of the irregular gear is provided with teeth, and the inner wall of the strip frame is provided with a tooth-like structure, and the teeth mesh with the tooth-like structure.

[0011] As a further preferred embodiment of the present invention, a socket is fixedly installed at the other end of the magnetic cylinder, a plug plate is movably inserted into the socket, the plug plate is fixedly connected to the top of the sliding rod, the sliding rod is slidably disposed inside the sleeve, and a second elastic element is fixedly installed between the plug plate and the sleeve.

[0012] As a further preferred embodiment of the present invention, a feed inlet is fixedly installed on the top of the magnetic cylinder, and a sealing plate is connected inside the feed inlet by a hinge.

[0013] As a further preferred embodiment of the present invention, a battery box is fixedly installed on the top of the base, a battery pack is provided inside the battery box, and a PLC controller is fixedly installed on the top surface of the battery box. The first motor, the second motor and the PLC controller are all electrically connected to the battery pack, and the PLC controller is electrically connected to the first motor and the second motor respectively.

[0014] As a further preferred embodiment of this utility model, the top of the socket is provided with a limiting device, the limiting device including an elongated groove formed at the top of the socket, a movable plate slidably connected inside the elongated groove, a first elastic element fixedly installed between the two movable plates, a hinge plate hinged to the end of the movable plate away from the elongated groove, a T-shaped plate hinged to the end of the hinge plate away from the movable plate, a pull rod fixed to the top of the T-shaped plate, a positioning plate fixed to the end of the T-shaped plate away from the pull rod, and a positioning groove that engages with the positioning plate inside the insert plate.

[0015] As a further preferred embodiment of this utility model, the positioning plate is internally threaded with a bolt, and a threaded hole matching the bolt is provided on one side of the socket.

[0016] Compared with the prior art, the advantages and positive effects of this utility model include: 1) This utility model provides a demagnetizing device for carbon nanotubes. By setting an auxiliary device, a first motor drives the rotating rod and magnetic rod to rotate, so that the magnetic field of the magnetic rod is evenly covered in the magnetic cylinder, which can fully adsorb magnetic impurities in carbon nanotube powder. At the same time, a second motor drives a special gear and a bar frame to move the magnetic cylinder back and forth, so that the powder is continuously splashed up and down, which greatly increases the contact area between the powder and the magnetic rod. This effectively solves the problem that impurities cannot fully contact the magnetic rod after the powder agglomerates in the traditional static adsorption process, significantly reduces impurity residue, and improves the purity of carbon nanotubes.

[0017] 2) This utility model provides a demagnetizing device for carbon nanotubes. By setting a limiting device, it is easy to load and unload the magnetic cylinder, so that the demagnetized carbon nanotube powder can be taken out in time after demagnetization. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This utility model Figure 1 Another structural diagram from a different angle; Figure 3 This utility model Figure 1 A schematic diagram of the cross-sectional structure; Figure 4 This utility model Figure 2 A schematic diagram of the three-dimensional structure at point A in the middle.

[0019] Legend: 1. Base; 2. Auxiliary device; 201. First motor; 202. Rotating rod; 203. Magnetic rod; 204. Sliding plate; 205. Strip frame; 206. Support rod; 207. Arc bracket; 208. Vertical plate; 209. Second motor; 210. Special gear; 3. Limiting device; 301. Long slot; 302. Movable plate; 303. First elastic element; 304. Hinge plate; 305. T-shaped plate; 306. Positioning plate; 307. Positioning groove; 308. Bolt; 309. Threaded hole; 310. Pull rod; 4. Sleeve; 5. Sliding rod; 6. Insert plate; 7. Magnetic cylinder; 8. Socket; 9. Feed port; 10. Battery box; 11. PLC controller; 12. Second elastic element. 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] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" 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 a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] [First Embodiment] like Figure 1-4 The first embodiment of this utility model shows a demagnetizing device for carbon nanotubes, including a base 1 and a magnetic cylinder 7. A feed inlet 9 is fixedly installed on the top of the magnetic cylinder 7. A sealing plate is connected to the inside of the feed inlet 9 by a hinge. In this embodiment, the magnetic cylinder 7 is made of 304 stainless steel, with a Teflon anti-stick coating on the inner wall. A silicone sealing ring is attached to the inner wall of the feed inlet 9, and a silicone pad is provided on the surface of the sealing plate.

[0024] The improvement of this embodiment compared to the prior art is as follows: On one hand, a sleeve 4 is fixedly installed on the surface of the base 1, and the magnetic cylinder 7 can slide and rise relative to the base 1 through the sleeve 4; for example Figure 1-3 As shown, a slide plate 204 is slidably connected to the outer wall of the sleeve 4. A strip frame 205 is fixedly installed on the side of the slide plate 204 near the magnetic cylinder 7. A support rod 206 is fixedly installed on the top of the strip frame 205. An arc-shaped bracket 207 is fixedly installed on the end of the support rod 206 away from the strip frame 205. The arc-shaped bracket 207 can support the top magnetic cylinder 7, thereby driving the magnetic cylinder 7 to reciprocate up and down through the support rod 206. A silicone pad can be attached to the inner wall of the arc-shaped bracket 207 to achieve flexible contact while ensuring stable support.

[0025] A vertical plate 208 is fixedly installed on the top of the base 1. A second motor 209 is fixedly installed on one side of the vertical plate 208. A special-shaped gear 210 is fixedly installed at the output end of the second motor 209. Part of the outer edge of the special-shaped gear 210 is provided with teeth. The inner wall of the strip frame 205 is provided with a tooth-like structure. The teeth mesh with the tooth-like structure. The output power of the second motor 209 drives the special-shaped gear 210 to cooperate with the strip frame 205, driving the magnetic cylinder 7 to move back and forth, allowing the powder to be continuously poured up and down, greatly increasing the contact area between the powder and the magnetic rod. This effectively solves the problem that impurities cannot fully contact the magnetic rod after powder agglomeration in the traditional static adsorption process, significantly reducing impurity residue and improving the purity of carbon nanotubes. Preferably, the second motor 209 in this embodiment is a stepper motor, model 42HS08, with an encoder. The tooth module of the inner walls on both sides of the strip frame 205 is 2mm, and one-third of the outer edge of the special-shaped gear 210 is provided with teeth.

[0026] To achieve limiting during the lifting and lowering process, a socket 8 is fixedly installed at the other end of the magnetic cylinder 7. A plug plate 6 is movably inserted into the socket 8. The plug plate 6 is fixedly connected to the top of the sliding rod 5. The sliding rod 5 is slidably disposed inside the sleeve 4. A second elastic element 12 is fixedly installed between the plug plate 6 and the sleeve 4. The lifting and lowering process of the sliding rod 5 inside the sleeve 4 is used to limit the reciprocating lifting and lowering movement of the magnetic cylinder 7. The second elastic element 12 is preferably made of stainless steel, with a wire diameter of 3mm and an elastic coefficient of 5N / mm. The elastic restoring force provided by the second elastic element 12 can help the magnetic cylinder 7 achieve elastic reset after lifting and lowering.

[0027] On the other hand, an auxiliary device 2 is provided at one end of the magnetic cylinder 7. The auxiliary device 2 includes a first motor 201 fixedly installed at one end of the magnetic cylinder 7. Rotating rods 202 are rotatably connected to both ends of the inner wall of the magnetic cylinder 7. The rotating rods 202 are fixedly connected to the output end of the first motor 201. Multiple magnetic rods 203 are evenly distributed on the outer wall of the rotating rods 202. The output power of the first motor 201 drives the rotating rods 202 and the magnetic rods 203 to rotate, so that the magnetic field of the magnetic rods 203 is evenly covered in the magnetic cylinder, which can fully adsorb magnetic impurities in the carbon nanotube powder. Preferably, the first motor 201 in this embodiment is a stepper motor, model 57HS22, with overload protection function; and the magnetic rods 203 are made of neodymium iron boron material with a magnetic field strength of 12000-15000Gs.

[0028] By setting up an auxiliary device, the first motor drives the rotating rod and magnetic rod to rotate, so that the magnetic field of the magnetic rod is evenly covered inside the magnetic cylinder, which can fully adsorb magnetic impurities in carbon nanotube powder. At the same time, the second motor drives the special gear and the bar frame to move the magnetic cylinder back and forth up and down, so that the powder is continuously splashed up and down, which greatly increases the contact area between the powder and the magnetic rod. This effectively solves the problem that impurities cannot fully contact the magnetic rod after the powder agglomerates in the traditional static adsorption process, significantly reduces impurity residue, and improves the purity of carbon nanotubes.

[0029] like Figure 1 As shown, a battery box 10 is fixedly installed on the top of the base 1. The battery box 10 contains a battery pack, and a PLC controller 11 is fixedly installed on the top surface of the battery box 10. The first motor 201, the second motor 209, and the PLC controller 11 are all electrically connected to the battery pack, so that the battery pack provides power to the PLC controller 11, the first motor 201, and the second motor 209. The PLC controller 11 is electrically connected to the first motor 201 and the second motor 209 respectively to perform corresponding control operations on the first motor 201 and the second motor 209. Preferably, in this embodiment, the battery pack inside the battery box 10 uses 12V / 50Ah batteries, and the PLC controller 11 is a model S7-200 SMART with a touch screen.

[0030] like Figure 2 and Figure 4 As shown, the top of the socket 8 is provided with a limiting device 3. The limiting device 3 includes an elongated groove 301 formed in the top of the socket 8. A movable plate 302 is slidably connected inside the elongated groove 301. A first elastic member 303 is fixedly installed between the two movable plates 302. A hinge plate 304 is hinged to the end of the movable plate 302 away from the elongated groove 301. A T-shaped plate 305 is hinged to the end of the hinge plate 304 away from the movable plate 302. A pull rod 310 is fixed to the top of the T-shaped plate 305. The T-shaped plate 305 is further away from the pull rod 310. One end is fixed with a positioning plate 306, and the inside of the insert plate 6 is provided with a positioning groove 307 that is inserted and matched with the positioning plate 306; the inside of the positioning plate 306 is threaded with a bolt 308, and one side of the socket 8 is provided with a threaded hole 309 that matches the bolt 308. In this embodiment, the first elastic element 303 is a stainless steel spring with a wire diameter of 2mm and an elastic coefficient of 3N / mm. By setting a limiting device, it is easy to load and unload the magnetic cylinder, so as to facilitate the timely removal of the demagnetized carbon nanotube powder after demagnetization.

[0031] When demagnetization is required, the specific working steps in this embodiment include: S100: Set parameters for PLC controller 11: Based on the application requirements of carbon nanotubes, such as electronic grade, composite material grade, etc., select the corresponding demagnetization mode on the touch screen of PLC controller 11, or manually set the speed of the first motor 201 to control the rotation speed of the magnetic rod 203, and the speed of the second motor 209 to control the lifting frequency and demagnetization duration of the magnetic cylinder 7. After setting the parameters, click "Confirm" to put the equipment into standby mode. S200: Feeding through inlet 9: Open the sealing plate of inlet 9 and check whether the silicone sealing ring on the inner wall of inlet 9 is intact. If it is damaged, replace it to avoid powder leakage. Slowly pour the pretreated carbon nanotube powder into the magnetic cylinder 7. The amount poured in should not exceed 2 / 3 of the volume of the magnetic cylinder 7. Then close and lock the sealing plate and cover the inlet 9 with the sealing plate. Ensure that the silicone pad is tightly attached to the edge of the inlet 9 without gaps. Gently pull the sealing plate to confirm that it is locked firmly to prevent the powder from flying due to the shaking of the magnetic cylinder during the demagnetization process. S300: Start the first motor 201: After the feeding is completed, start the first motor 201. Send the start command through the PLC controller 11. The output end of the first motor 201 drives the rotating rod 202 to rotate between the inner walls of the two ends of the magnetic cylinder 7. Multiple magnetic rods 203 distributed on the outer wall of the rotating rod 202 rotate synchronously with the rotating rod 202. The high magnetic field of the magnetic rods 203 adsorbs magnetic impurities in the carbon nanotube powder. S400: Start the second motor 209: Simultaneously with the start of the first motor 201, the second motor 209 is started. The second motor 209 drives the shaped gear 210 to rotate. Since only a portion (e.g., 1 / 3) of the outer edge of the shaped gear 210 has teeth, and these teeth mesh with the tooth-like structure on the inner wall of the strip frame 205, when the teeth of the shaped gear 201 mesh with the tooth-like structure on the inner wall of the strip frame 205, it will push the strip frame 205 to move upward along the outer wall of the sleeve 4. When the strip frame 205 moves upward, it will drive the sliding plate 204 on one side to slide synchronously on the outer wall of the sleeve 4. At the same time, the support rod 206 at the top of the strip frame 205 rises with the strip frame 205, thereby pushing the arc-shaped bracket 207 at the top of the support rod 206 to lift the magnetic cylinder 7 upward. During the upward movement of the magnetic cylinder 7, The other end of the socket 8, the insert plate 6 and the sliding rod 5 move synchronously, so that the sliding rod 5 extends outward from the inside of the sleeve 4. The second elastic element 12 between the insert plate 6 and the sleeve 4 is stretched and stored. When the shaped gear 210 rotates to the toothless area and contacts the strip frame 205, the strip frame 205 loses its upward thrust. At this time, the second elastic element 12 pulls the insert plate 6, the sliding rod 5 and the magnetic cylinder 7 downward to reset under the action of elastic restoring force. As the second motor 209 continues to drive the shaped gear 210 to rotate, the strip frame 205 will cycle to realize the "up-down" action, which in turn drives the magnetic cylinder 7 to move up and down repeatedly, so that the carbon nanotube powder inside the magnetic cylinder 7 is continuously splashed up and down, increasing the contact area between the powder and the rotating magnetic rod 203, ensuring that magnetic impurities are fully adsorbed and improving the demagnetization effect. S500: Monitoring and Protection: During the demagnetization process, the PLC controller 11 will monitor the operating current of the first motor 201 and the second motor 209 in real time. If the motor current exceeds the rated value due to powder blockage or component jamming, the controller will immediately trigger overload protection, cut off the motor power supply, and prevent the motor from burning out. S600: Stop and Unlock: When the demagnetization time reaches the preset value, a stop command is first sent through the PLC controller 11. The first motor 201 and the second motor 209 stop running synchronously, and the magnetic rod 203 and the magnetic cylinder 7 stop moving. Then, the limit device 3 is unlocked, the bolt 308 is loosened, and the bolt 308 is completely dislodged from the threaded hole 309 on the side of the socket 8, releasing the bolt 308 from limiting the positioning plate 306. Then, the pull rod 310 is pulled: the pull rod 310 drives the T-shaped plate 305 to move away from the socket 8. The T-shaped plate 305 pulls the two movable plates 302 to slide closer to each other inside the long groove 301 through the hinge plate 304. The first elastic element 303 between the movable plates 302 is compressed. At the same time, the T-shaped plate 305 drives the positioning plate 306 to dislodge from the positioning groove 307 on the surface of the insert plate 6, releasing the positioning plate 306 from limiting the insert plate 6 and the socket 8. S700: Disassembly and Discharge: After the limit is released, hold both ends of the magnetic cylinder 7 and pull the magnetic cylinder 7 away from the insert plate 6 to disassemble the socket 8 from the insert plate, thus completing the disassembly of the magnetic cylinder 7; turn the disassembled magnetic cylinder 7 with the discharge port facing down, and then open the sealing plate to let the demagnetized carbon nanotube powder fall into the preset collection container, thus completing the unloading operation.

[0032] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any other way. Any person skilled in the art may use the disclosed technical content to make changes or modifications to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model, without departing from the scope of the utility model's technical solution, still fall within the protection scope of this utility model's technical solution. In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood through specific circumstances.

Claims

1. A demagnetizing device for carbon nanotubes, comprising a base (1) and a magnetic cylinder (7), characterized in that: A sleeve (4) is fixedly installed on the surface of the base (1), and the magnetic cylinder (7) can slide up and down relative to the base (1) through the sleeve (4); An auxiliary device (2) is provided at one end of the magnetic cylinder (7). The auxiliary device (2) includes a first motor (201) fixedly installed at one end of the magnetic cylinder (7). Rotating rods (202) are rotatably connected to both ends of the inner wall of the magnetic cylinder (7). The rotating rods (202) are fixedly connected to the output end of the first motor (201). Multiple magnetic rods (203) are evenly distributed on the outer wall of the rotating rods (202).

2. The demagnetizing device for carbon nanotubes according to claim 1, characterized in that: The outer wall of the sleeve (4) is slidably connected to a slide plate (204), and a strip frame (205) is fixedly installed on the side of the slide plate (204) near the magnetic cylinder (7).

3. The demagnetizing device for carbon nanotubes according to claim 2, characterized in that: A support rod (206) is fixedly installed on the top of the strip frame (205), and an arc-shaped bracket (207) is fixedly installed on the end of the support rod (206) away from the strip frame (205).

4. The demagnetizing device for carbon nanotubes according to claim 1, characterized in that: A vertical plate (208) is fixedly installed on the top of the base (1), and a second motor (209) is fixedly installed on one side of the vertical plate (208). A special gear (210) is fixedly installed at the output end of the second motor (209).

5. A demagnetizing device for carbon nanotubes according to claim 4, characterized in that: The outer edge of the shaped gear (210) is provided with teeth, and the inner wall of the strip frame (205) is provided with a tooth-like structure, and the teeth mesh with the tooth-like structure.

6. A demagnetizing device for carbon nanotubes according to claim 1, characterized in that: A socket (8) is fixedly installed at the other end of the magnetic cylinder (7). A plug plate (6) is movably inserted into the socket (8). The plug plate (6) is fixedly connected to the top of the sliding rod (5). The sliding rod (5) is slidably disposed inside the sleeve (4). A second elastic element (12) is fixedly installed between the plug plate (6) and the sleeve (4).

7. A demagnetizing device for carbon nanotubes according to claim 1, characterized in that: The top of the magnetic cylinder (7) is fixedly installed with a feed inlet (9), and the inside of the feed inlet (9) is connected to a sealing plate by a hinge.

8. A demagnetizing device for carbon nanotubes according to claim 4, characterized in that: A battery box (10) is fixedly installed on the top of the base (1). The battery box (10) contains a battery pack. A PLC controller (11) is fixedly installed on the top surface of the battery box (10). The first motor (201), the second motor (209) and the PLC controller (11) are all electrically connected to the battery pack. The PLC controller (11) is electrically connected to the first motor (201) and the second motor (209) respectively.

9. A demagnetizing device for carbon nanotubes according to claim 6, characterized in that: The socket (8) is provided with a limiting device (3) at the top. The limiting device (3) includes a long groove (301) opened at the top of the socket (8). A movable plate (302) is slidably connected inside the long groove (301). A first elastic element (303) is fixedly installed between the two movable plates (302). A hinge plate (304) is hinged to one end of the movable plate (302) away from the long groove (301). A T-shaped plate (305) is hinged to one end of the hinge plate (304) away from the movable plate (302). A pull rod (310) is fixed to the top of the T-shaped plate (305). A positioning plate (306) is fixed to one end of the T-shaped plate (305) away from the pull rod (310). A positioning groove (307) is opened inside the insert plate (6) to engage with the positioning plate (306).

10. A demagnetizing device for carbon nanotubes according to claim 9, characterized in that: The positioning plate (306) is internally threaded with a bolt (308), and the socket (8) has a threaded hole (309) on one side that matches the bolt (308).

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