A fixing device for facilitating welding of metal materials

Abstract

This utility model discloses a fixing device for facilitating the welding of metal materials, relating to the field of welding fixing technology. The utility model includes a welding fixing table, with a drive assembly and two corresponding sliding seats on the upper part of the welding fixing table. A plate is mounted on one side of the upper part of the sliding seats, and an adjusting component and two clamping components are movably fitted on the plate. The clamping components include movable clamps, with the plate located between the upper and lower movable clamps. Two clamping rods are mounted on one side of the movable clamps. This utility model controls the movement of the sliding seats through the drive assembly, facilitating the adjustment of the distance between the two plates. By rotating a knob at a certain angle, a drive rod drives the end face gear plate and gear ring to rotate synchronously, causing the gear ring to drive the meshing gears to rotate synchronously. Utilizing the meshing relationship of the two gears on the same side of the plate, the upper and lower movable clamps can move in opposite directions, improving the convenience of clamping, fixing, and disassembling tubular workpieces.

Description

Technical Field

[0001] This utility model belongs to the field of welding and fixing, specifically, it relates to a fixing device that facilitates the welding of metal materials. Background Technology

[0002] Fixing equipment for metal welding is a device specifically designed to securely clamp metal workpieces during the welding process. Its core function is to ensure accurate workpiece positioning, prevent displacement, and improve welding quality and efficiency.

[0003] Chinese Patent No. CN218051077U discloses a fixing device for welding metal materials, including: an operating table, two mounting plates slidably connected to the top of the operating table, a backing plate fixedly connected to the top of the mounting plates, a clamping plate for clamping the outer side of a tubular metal material slidably connected inside the backing plate, multiple sets of clamping plates arranged in a circumferential array about the center of the backing plate, an anti-slip pad fixedly connected to one side of the clamping plate, a convergence mechanism for bringing the multiple sets of clamping plates together on the mounting plate, and a T-shaped slider fixedly connected to the bottom of the mounting plate.

[0004] The metal welding fixing device disclosed in the application requires manual rotation of the hand lever to drive the threaded cylinder to rotate, which moves along the adjusting screw, thereby causing multiple sets of clamping plates to come together to clamp the tubular metal material. However, when the size of the tubular metal material to be welded varies greatly, the hand lever needs to be rotated many times during the adjustment process, resulting in low adjustment efficiency and easily affecting the efficiency of metal material assembly and disassembly. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a fixing device that facilitates the welding of metal materials, thus solving the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by this utility model is as follows:

[0007] A fixing device for facilitating the welding of metal materials includes: a welding fixing table, a driving component and two sliding seats corresponding to the driving component are provided on the upper part of the welding fixing table, a plate is installed on one side of the upper part of the sliding seats, the plate is located between the two sliding seats, and an adjusting component and two clamping components are movably fitted on the plate.

[0008] The clamping component includes a movable clamp, and the plate body is located between the upper and lower movable clamps. Two clamping rods are installed on one side of the movable clamp. Two extension plates are movably connected to the end of the movable clamp away from the clamping rods. Gears are provided at the ends of the extension plates away from the movable clamp. The movable clamp is located between two corresponding gears. The gears are rotatably engaged on one side of the plate body. The two gears on the same side of the plate body mesh with each other. A rotating component is movably connected in the middle of the movable clamp. The end of the rotating component away from the movable clamp is rotatably engaged on the plate body.

[0009] The adjusting component includes a knob, one end of which is provided with a rotating rod that extends laterally through the plate. An end face gear and two gear rings are mounted around the rotating rod. The plate is located between the two gear rings, and the gear rings are located between the end face gear and the knob. The end face gear is located on one side of one of the gear rings, and the gear ring meshes with the corresponding gear. A locking component that meshes with the end face gear is elastically fitted on the plate.

[0010] Optionally, the drive assembly includes a motor mounted on one side of the welding station, with a bidirectional lead screw fixedly connected to the motor output shaft. A slide groove is provided on the upper side of the welding station, with the bidirectional lead screw passing through the slide groove laterally. The lower part of the sliding seat is slidably fitted in the slide groove, and the lower part of the sliding seat is threadedly fitted around the periphery of the bidirectional lead screw.

[0011] Optionally, the sliding seat includes a sliding plate that is slidably fitted on the upper side of the welding fixing platform, a support block is mounted on the sliding plate, the plate body is mounted on the upper side of one side of the support block, and a slider that is slidably fitted in a groove is provided under the sliding plate, with the slider threadedly fitted on the periphery of the bidirectional lead screw.

[0012] Optionally, the locking component includes an L-shaped slide bar and a storage seat mounted on one side of the plate. The storage seat is located above the end face gear plate and the gear ring. The plate is located between the storage seat and the knob. One end of the L-shaped slide bar slides elastically within the storage seat. A toothed block that meshes with the end face gear plate is mounted on the lower side of the L-shaped slide bar. The end face gear plate is located between the toothed block and the gear ring.

[0013] Optionally, the storage base has a slot on the side away from the board, one end of the L-shaped slide rod passes through the slot, a limiting groove is provided on one side of the slot, a limiting plate is installed on one side of the L-shaped slide rod that slides in the limiting groove, a spring is provided between the limiting plate and one side of the limiting groove, and the spring is sleeved on the periphery of one end of the L-shaped slide rod.

[0014] Optionally, a first shaft is installed between the two gears of the clamping member, and the shaft extends laterally through the plate.

[0015] Optionally, the movable clamp is equipped with second shafts on both sides of the end away from the clamping rod, and the end of the extension plate away from the gear is sleeved around the corresponding second shaft.

[0016] Optionally, the rotating component includes two rotating plates, with the movable clamp and the plate body located between the two rotating plates. A gear is located between the gear ring and the rotating plates. Two third shafts are installed between the two rotating plates, with one third shaft passing through the plate body laterally and the other third shaft passing through the middle of the corresponding movable clamp laterally.

[0017] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art. Of course, any product implementing the present invention does not necessarily need to achieve all of the following advantages at the same time:

[0018] The sliding seat is moved by controlling the drive assembly, which facilitates the adjustment of the distance between the two plates. By rotating a knob at a certain angle, the drive rod drives the end face gear plate and gear ring to rotate synchronously, and the gear ring drives the meshing gears to rotate synchronously. By utilizing the meshing relationship of the two gears on the same side of the plates, the upper and lower movable clamps can move in opposite directions, which improves the convenience of clamping, fixing and disassembling tubular workpieces. The clamping rod realizes external clamping or internal clamping of tubular workpieces, which improves the diversity of clamping methods. The engagement of the locking element with the end face gear plate makes it easy to quickly lock the rotation of the drive rod, which improves the stability of clamping.

[0019] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings. Attached Figure Description

[0020] The accompanying drawings described below are merely some embodiments. Those skilled in the art can obtain other drawings based on these drawings without any creative effort. In the drawings:

[0021] Figure 1 This is a schematic diagram of the three-dimensional structure;

[0022] Figure 2 This is a schematic diagram of the internal structure of the welding station.

[0023] Figure 3 This is a schematic diagram of the clamping and adjusting components.

[0024] The attached diagram lists the components represented by each number as follows:

[0025] 1. Welding fixing table, 2. Motor, 3. Two-way lead screw, 4. Support block, 5. Slide plate, 6. Plate body, 7. End face gear plate, 8. Gear ring, 9. L-shaped slide bar, 10. Storage seat, 11. Slider, 12. Gear, 13. Extension plate, 14. Movable clamp, 15. Rotating plate, 16. Knob, 17. Rotating rod, 18. Clamping rod.

[0026] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the present invention in any way, but rather to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0027] 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.

[0028] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] In the field of metal welding, fixing equipment plays a crucial role, and its performance directly affects welding accuracy, efficiency, and ease of operation. Especially for butt welding of tubular metal materials, such as the manufacture of piping systems, structural frames, or pressure vessels, the ability to stably, efficiently, and adaptably fix workpieces of different sizes has long been a technical requirement.

[0030] For a long time, the industry has generally relied on basic manual clamps to fix tubular workpieces. These devices are relatively simple in structure, typically consisting of a fixed base platform on which movable clamping arms or blocks are mounted. The most basic form includes V-block combinations, utilizing the workpiece's own weight and the inclined surface of the V-groove for initial positioning, but its stability is poor, making it only suitable for rough positioning or applications where high welding stress is not required. For scenarios requiring firm fixation, engineers often use manual clamps with threaded drives. Their core structure involves a guide rail on the base, with one or a pair of clamping blocks connected to the base or handle via a threaded rod (such as a screw). During operation, the worker needs to repeatedly rotate the handle or screw to drive the clamping blocks to move linearly along the rail, gradually approaching the workpiece until clamped. While this design provides reliable clamping force, its adjustment process is time-consuming and labor-intensive. When the diameter or wall thickness of the pipe to be welded changes significantly, the operator often needs to turn the screw many times to complete the large-range displacement adjustment of the clamping arm, which greatly reduces the efficiency of clamping and disassembly. This becomes a bottleneck restricting the overall efficiency, especially on production lines where workpiece dimensions need to be changed frequently.

[0031] To improve adjustment speed, some improved designs introduce lever mechanisms or quick-release clamps. Lever-type clamps amplify operating force using the lever principle, enabling rapid opening and closing of the clamping blocks; however, their stroke is usually limited, and precise fine-tuning of the clamping force is difficult. Quick-release clamps (such as toggle clamps) can provide greater locking force at the end of their stroke, but they are still insufficient in adjusting the initial clamping position and adapting to a wide range of dimensional changes. Another common solution borrows from the three-jaw chuck structure on machine tools. This type of fixing device has a central turntable on the base, which drives three jaws distributed at 120 degrees to move radially synchronously via bevel gears or flat threads. Rotating the turntable causes the three jaws to simultaneously move towards the center or open outward, thereby clamping or releasing the tubular workpiece located in the center. The three-jaw linkage ensures automatic centering and relatively stable clamping. However, its structure is relatively complex and its manufacturing cost is high. More importantly, its clamping range is limited by the stroke and design of the jaws. For pipe diameters exceeding its design range, it either cannot clamp the pipe or requires replacing the jaws (such as using soft jaws or special jaws). It also suffers from insufficient adjustment flexibility and low efficiency. Especially when switching between two modes of clamping the pipe from the outside (external clamping) and supporting it from the inside (internal support), traditional devices often require changing different clamping components or making cumbersome adjustments, lacking convenience.

[0032] With the increasing demand for automation, welding fixtures have also incorporated electric drive elements. For example, in welding fixtures for large or heavy pipes, motor-driven lead screws (one-way or two-way) are used to replace manual rotation, moving the clamping seat on the base guide rail to achieve automatic alignment of the ends of the two pipes to be welded. This solves the physical burden and some efficiency problems of moving large workpieces, but the mechanism by which the clamping seat itself clamps a single pipe—that is, how to quickly adapt to different pipe diameters and firmly clamp the pipe itself—usually still relies on the aforementioned manual screw, lever, or chuck mechanism. Therefore, the bottleneck of overall clamping efficiency often shifts to the clamping and adjustment of individual workpieces. In addition, to ensure the reliability of clamping and prevent the fixture from loosening due to vibration during welding, most fixing devices integrate some form of locking mechanism. The most common is friction locking, such as setting a locking nut on the screw handle, relying on the friction between the threaded pairs to prevent the screw from rotating. More convenient designs use ratchet and pawl mechanisms, allowing unidirectional adjustment and self-locking at any position. While these locking methods are effective, in scenarios requiring frequent adjustments, the unlocking and relocking operations add extra steps and time consumption.

[0033] In summary, metal welding and fixing equipment, especially for tubular workpieces, has evolved into various forms, from simple manual screw clamps and lever / quick clamps to complex chuck-type centering clamps and motor-driven mobile platforms. Despite advancements in drive methods, centering capabilities, and locking reliability, the core clamping mechanism (whether external or internal) still suffers from significant shortcomings in adjustment speed and ease of use when dealing with frequent and substantial changes in pipe dimensions. Most equipment relies on operators performing multiple rotations or complex operations to achieve a wide range of clamping arm displacement, and switching between external and internal clamping modes is often inconvenient. This directly restricts efficiency in the welding preparation stage, becoming a key pain point in improving the overall production process. Therefore, developing a fixing mechanism that allows for rapid, wide-range, stepless adjustment of the clamping position, convenient switching of clamping modes, and reliable locking has been a long-standing goal for engineers in this field, aiming to meet the demands of modern, efficient, and flexible welding production.

[0034] Please see Figure 1-3 As shown, this embodiment provides a fixing device for facilitating the welding of metal materials, including: a welding fixing table 1, a driving component and two sliding seats corresponding to the driving component are provided on the upper part of the welding fixing table 1, a plate 6 is installed on one side of the upper part of the sliding seats, the plate 6 is located between the two sliding seats, and an adjusting component and two clamping components are movably fitted on the plate 6.

[0035] The clamping component includes a movable clamp 14. The plate body 6 is located between the upper and lower movable clamps 14. Two clamping rods 18 are installed on one side of the movable clamp 14. Two extension plates 13 are movably connected to the end of the movable clamp 14 away from the clamping rods 18. A gear 12 is provided at the end of the extension plate 13 away from the movable clamp 14. The movable clamp 14 is located between the two corresponding gears 12. The gear 12 is rotatably engaged on one side of the plate body 6. The two gears 12 on the same side of the plate body 6 are meshed. A rotating component is movably connected in the middle of the movable clamp 14. The end of the rotating component away from the movable clamp 14 is rotatably engaged on the plate body 6.

[0036] The adjusting component includes a knob 16, with a rotating rod 17 at one end of the knob 16. The rotating rod 17 extends horizontally through the plate 6. An end face gear 7 and two gear rings 8 are mounted around the rotating rod 17. The plate 6 is located between the two gear rings 8. The gear rings 8 are located between the end face gear 7 and the knob 16. The end face gear 7 is located on one side of one of the gear rings 8. The gear ring 8 meshes with the corresponding gear 12. A locking component that meshes with the end face gear 7 is elastically fitted on the plate 6.

[0037] One application of this embodiment is as follows: In use, pull the locking member to cancel the engagement limit with the end face gear plate 7, and then rotate the knob 16 at a certain angle to drive the rotating rod 17, the end face gear plate 7 and the gear ring 8 to rotate synchronously. At this time, the rotation of the gear ring 8 drives the gear 12 meshing with it to rotate. The rotation of the gear 12 drives the extension plate 13 to rotate synchronously. The rotation of the extension plate 13 drives the movable clamp 14 and the rotating part in its middle to rotate. Since the two gears 12 on the same side of the plate 6 mesh with each other, the upper and lower sets of movable clamps 14 move towards or in opposite directions in the upper and lower space of the plate 6. Thus, the clamping rod 18 can be used to externally clamp or internally clamp the tubular workpiece of the metal material to be welded. After the clamping is stable, release the locking member so that it can quickly reset under the action of the spring force and re-meet with the end face gear plate 7 to achieve self-locking. Then control the drive component to drive the two sliding seats to move closer to each other, so that the two tubular workpieces are close together for welding. Similarly, the above operation can be used to quickly disassemble the tubular workpiece. It should be noted that all electrical devices involved in this application can be powered by batteries or external power sources.

[0038] The sliding seat is moved by controlling the drive component, which facilitates the adjustment of the distance between the two plates 6. By rotating the knob 16 at a certain angle, the drive rod 17 drives the end face gear plate 7 and the gear ring 8 to rotate synchronously, and the gear ring 8 drives the meshing gear 12 to rotate synchronously. By utilizing the meshing relationship of the two gears 12 on the same side of the plates 6, the upper and lower movable clamps 14 can move in opposite directions, which improves the convenience of clamping, fixing and disassembling tubular workpieces. The clamping rod 18 realizes external clamping or internal clamping of tubular workpieces, which improves the diversity of clamping methods. The engagement of the locking element with the end face gear plate 7 makes it easy to quickly lock the rotation of the drive rod 17, which improves the stability of clamping.

[0039] like Figure 1 As shown, the driving assembly in this embodiment includes a motor 2 mounted on one side of the welding station 1. The output shaft of the motor 2 is fixedly connected to a bidirectional lead screw 3. A slide groove is provided on the upper side of the welding station 1. The bidirectional lead screw 3 passes through the slide groove laterally. The lower part of the sliding seat is slidably fitted in the slide groove, and the lower part of the sliding seat is threadedly fitted on the periphery of the bidirectional lead screw 3. The motor 2 drives the bidirectional lead screw 3 to rotate, which drives the two sliding seats to move synchronously in opposite directions along the slide groove, which facilitates the adjustment of the distance between the two plates 6 and realizes the rapid alignment of the two tubular workpieces.

[0040] like Figure 1 , 2As shown, the sliding seat in this embodiment includes a sliding plate 5 that is slidably fitted on the upper side of the welding fixing table 1. A support block 4 is mounted on the sliding plate 5. The plate body 6 is mounted on the upper part of one side of the support block 4. A slider 11 that is slidably fitted in a groove is provided under the sliding plate 5. The slider 11 is threadedly fitted on the periphery of the bidirectional lead screw 3. The sliding plate 5 and the support block 4 cooperate to provide stable support for the plate body 6. The slider 11 and the groove cooperate to improve the stability of the sliding seat when sliding.

[0041] like Figure 3 As shown, the locking component in this embodiment includes an L-shaped slide bar 9 and a storage seat 10 mounted on one side of the plate 6. The storage seat 10 is located above the end face gear plate 7 and the gear ring 8. The plate 6 is located between the storage seat 10 and the knob 16. One end of the L-shaped slide bar 9 slides elastically within the storage seat 10. A toothed block that meshes with the end face gear plate 7 is mounted on the lower side of the L-shaped slide bar 9. The end face gear plate 7 is located between the toothed block and the gear ring 8. An insertion hole is provided on the upper side of the L-shaped slide bar 9, which can be pulled to... The insertion hole is pulled out from the storage base 10, and then a fixing pin is inserted into the insertion hole to restrict the reset of the L-shaped slide bar 9, so that the tooth block remains in a state of disengagement from the end face toothed disk 7. By elastically sliding the L-shaped slide bar 9 within the storage base 10, the state switching between engagement and disengagement of the tooth block and the end face toothed disk 7 can be realized. It is convenient to pull the L-shaped slide bar 9 with one hand to release the locking of the tooth block to the end face toothed disk 7. By restricting the movement path of the L-shaped slide bar 9 through the storage base 10, the reliability of the locking action is improved.

[0042] like Figure 3 As shown, the storage base 10 in this embodiment has a slot on the side away from the plate 6. One end of the L-shaped slide rod 9 passes through the slot, and a limiting groove is provided on one side of the slot. A limiting plate that slides in the limiting groove is installed on one side of the L-shaped slide rod 9. A spring is provided between the limiting plate and one side of the limiting groove. The spring is sleeved on the periphery of one end of the L-shaped slide rod 9. The limiting groove constrains the movement direction and distance of the limiting plate, reducing the probability of the L-shaped slide rod 9 disengaging from the slot. Combined with the spring, the L-shaped slide rod 9 is automatically reset, which facilitates the quick restoration of the locking state of the locking component.

[0043] like Figure 1 , 3 As shown, in this embodiment, a first shaft is installed between the two gears 12 of the clamping member. The shaft extends laterally through the plate 6, connecting the two gears 12 and extending through the plate 6, thereby improving the synchronicity and stability of the rotation of the two gears 12 on the same clamping member.

[0044] like Figure 3 As shown, in this embodiment, the movable clamp 14 is equipped with second shafts on both sides of the end away from the clamping rod 18. The end of the extension plate 13 away from the gear 12 is sleeved on the periphery of the corresponding second shaft. The extension plate 13 and the movable clamp 14 are connected by the second shaft, reducing the probability of the extension plate 13 and the movable clamp 14 rotating and separating.

[0045] like Figure 3 As shown, the rotating component in this embodiment includes two rotating plates 15, with the movable clamp 14 and the plate body 6 located between the two rotating plates 15. The gear 12 is located between the gear ring 8 and the rotating plates 15. Two third shafts are installed between the two rotating plates 15. One third shaft passes through the plate body 6 laterally, and the other third shaft passes through the middle of the corresponding movable clamp 14 laterally. Through the two third shafts, the two ends of the two rotating plates 15 are rotatably connected to the plate body 6 and the movable clamp 14, respectively, thereby constraining the movement trajectory of the movable clamp 14 and reducing the probability of the movable clamp 14 deflecting when clamping.

[0046] This utility model is not limited to the above-described embodiments. Anyone should know that structural changes made under the guidance of this utility model, and any technical solutions that are the same as or similar to this utility model, fall within the protection scope of this utility model. Technical aspects, shapes, and structures not described in detail in this utility model are all publicly known technologies.

Claims

1. A fixture for facilitating welding of a metal material, characterized by comprising: include: Welding station (1), the upper part of the welding station (1) is provided with a drive assembly and two sliding seats corresponding to the drive assembly, a plate (6) is installed on one side of the upper part of the sliding seat, and an adjusting part and two clamping parts are movably fitted on the plate (6); The clamping component includes a movable clamp (14), and the plate (6) is located between the upper and lower movable clamps (14). Two clamping rods (18) are installed on one side of the movable clamp (14). Two extension plates (13) are movably connected to the end of the movable clamp (14) away from the clamping rods (18). A gear (12) is provided at the end of the extension plate (13) away from the movable clamp (14). The movable clamp (14) is located between the two corresponding gears (12). The gears (12) are rotatably engaged on one side of the plate (6). The two gears (12) on the same side of the plate (6) mesh with each other. A rotating component is movably connected in the middle of the movable clamp (14). The end of the rotating component away from the movable clamp (14) is rotatably engaged on the plate (6). The adjusting component includes a knob (16), one end of which is provided with a rotating rod (17). The rotating rod (17) passes through the plate (6) laterally. The rotating rod (17) is provided with an end face gear plate (7) and two gear rings (8) around its periphery. The gear rings (8) mesh with the corresponding gears (12). The plate (6) is elastically fitted with a locking component that meshes with the end face gear plate (7).

2. The fixture of claim 1, wherein: The drive assembly includes a motor (2) mounted on one side of the welding station (1), the output shaft of the motor (2) is fixedly connected to a double-acting screw (3), the upper side of the welding station (1) is provided with a slide groove, the double-acting screw (3) passes through the slide groove laterally, and the lower part of the sliding seat is threadedly fitted to the periphery of the double-acting screw (3).

3. The fixture of claim 2, wherein: The sliding seat includes a sliding plate (5) that slides on the upper side of the welding station (1), a support block (4) is mounted on the sliding plate (5), a plate body (6) is mounted on the upper side of the support block (4), and a slider (11) that slides in the groove is provided under the sliding plate (5). The slider (11) is threaded on the periphery of the double-acting screw (3).

4. The fixture of claim 1, wherein: The locking component includes an L-shaped slide bar (9) and a storage seat (10) installed on one side of the plate (6). One end of the L-shaped slide bar (9) slides elastically in the storage seat (10), and a toothed block that meshes with the end face toothed disc (7) is installed on the lower side of the L-shaped slide bar (9).

5. The fixture of claim 4, wherein the fixture is configured to facilitate welding of the metal material. The storage base (10) has a slot on the side away from the plate (6). One end of the L-shaped slide rod (9) passes through the slot. A limiting groove is provided on one side of the slot. A limiting plate that slides in the limiting groove is installed on one side of the L-shaped slide rod (9). A spring is provided between the limiting plate and one side of the limiting groove.

6. The fixing device for facilitating welding of metal materials according to claim 1, characterized in that, A first shaft is installed between the two gears (12) of the clamping member, and the shaft extends laterally through the plate (6).

7. A fixing device for facilitating welding of metal materials according to claim 1, characterized in that, The movable clamp (14) is equipped with second shafts on both sides of the end away from the clamping rod (18), and the end of the extension plate (13) away from the gear (12) is sleeved on the periphery of the corresponding second shaft.

8. A fixing device for facilitating welding of metal materials according to claim 1, characterized in that, The rotating component includes two rotating plates (15), and two third shafts are installed between the two rotating plates (15). One of the third shafts passes through the plate body (6) laterally, and the other third shaft passes through the middle of the corresponding movable clamp (14) laterally.

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