High-shock-resistance mounting structure of three-ring speed reducer

Abstract

The invention discloses a high anti-seismic mounting structure of a three-ring speed reducer, and relates to the technical field of anti-seismic mounting structures.The high anti-seismic mounting structure of the three-ring speed reducer comprises an upper mounting frame, a lower mounting frame, a clamping mechanism and a fastening mechanism, and the lower mounting frame is rotationally connected to the outer side of the upper mounting frame; the clamping mechanism is arranged on the outer side of the upper mounting frame and the outer side of the lower mounting frame, the fixing mechanism is rotationally connected to the inner side of the upper mounting frame and the inner side of the lower mounting frame, the clamping mechanism comprises a lower limiting rod, a spring telescopic rod and an anti-skid auxiliary block, and one end of the spring telescopic rod is limited through the lower limiting rod; the spring telescopic rods can push the anti-skid auxiliary bricks to rotate and change positions, the structural adaptability is improved, the clamping stability of the anti-skid auxiliary bricks is improved by increasing the contact surfaces of the surfaces of equipment with various appearances and sizes, and the situation that the equipment is damaged by shaking due to the poor anti-shaking effect caused by infirm fixation between the anti-skid auxiliary bricks and the equipment is avoided; and the production cost is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of earthquake-resistant mounting structures, in particular to a highly earthquake-resistant mounting structure for a three-ring reducer. Background Art

[0002] The three-ring reducer is a new type of transmission equipment that is widely used. It consists of an input shaft, three evenly distributed ring plates, planetary gears, internal gears, etc. It has a compact structure. When working, the power input shaft drives the planetary gears to move between the ring plates and the internal gears. Through rolling friction transmission, the ring plate movement is synthesized and output through the output shaft. It has strong load-bearing capacity, stable operation, low noise, and is characterized by excellent material selection, precise workmanship, good lubrication and sealing, and long service life. Therefore, it is used in many industries such as metallurgy, mining, lifting, transportation, chemical industry, and construction to provide power for crushers, ball mills, cranes and other mechanical equipment to achieve speed reduction and torque increase.

[0003] Due to the special working nature of the three-ring reducer, it is prone to vibration, which causes greater wear and tear on the parts of the three-ring reducer and reduces its service life. Therefore, in order to make the three-ring reducer work stably, a high-vibration-resistant mounting structure for the three-ring reducer is required.

[0004] However, the existing three-ring reducer high seismic installation structure has the following shortcomings: Currently, a high-vibration-resistant mounting structure for three-ring reducers on the market fixes the main body of the three-ring reducer on the required equipment. However, when it is installed on some equipment with irregular shapes, the specific mounting and fixing structure cannot match the shape of the equipment well. As a result, during actual work, the fixation between the reducer and the equipment is not firm, resulting in poor anti-shake effect, which may also cause the equipment to be damaged by shaking, increasing production costs.

[0005] Therefore, we proposed a three-ring reducer with high seismic resistance installation structure to solve the above problems. Summary of the Invention

[0006] The purpose of the present invention is to provide a highly seismic-resistant mounting structure for a three-ring reducer. The equipment is fixed by using the clamping mechanism of the upper mounting frame and the lower mounting frame. The telescopic bolt is turned, and the connecting pile moves inward due to the action of the thread, driving the electric telescopic rod on it to move inward synchronously until the rubber brick at the front end of the electric telescopic rod touches the equipment. Then, each electric telescopic rod is started, and the rubber bricks are driven in multiple directions to squeeze and apply force to each other. At this time, the spring telescopic rod behind it exerts force to push the anti-slip auxiliary bricks on the rubber bricks to rotate inward until the anti-slip auxiliary bricks are close to the surface of the equipment. The force of the spring telescopic rod is also transmitted to the surface of the equipment, thereby solving the problems raised in the above background.

[0007] To achieve the above objectives, the present invention provides the following technical solutions: a highly seismic-resistant mounting structure for a three-ring reducer, comprising an upper mounting frame, a lower mounting frame, a clamping mechanism, and a fixing mechanism, wherein the lower mounting frame is rotatably connected to the outside of the upper mounting frame, the clamping mechanism is disposed on the outsides of the upper and lower mounting frames, and the fixing mechanism is rotatably connected to the insides of the upper and lower mounting frames; The clamping mechanism includes a lower limit rod, a spring telescopic rod and an anti-slip auxiliary block. The lower limit rod limits one end of the spring telescopic rod so that the spring telescopic rod can push the anti-slip auxiliary block to rotate and change position, which can automatically increase the clamping area of the installed equipment. The fixing mechanism includes a rotating shaft ball and a rotating rod, which can be rotated outside the rotating shaft ball to increase the applicability of the installation.

[0008] Preferably, the clamping mechanism further comprises a plurality of fixing frames, which are respectively fixedly mounted on the outer sides of the upper mounting frame and the lower mounting frame, and a plurality of sliding holes are provided on the outer sides of the upper mounting frame and the lower mounting frame.

[0009] Preferably, an electric telescopic rod is provided on the inner side of the sliding hole, a connecting pile is fixedly connected to the outer side of the electric telescopic rod, a telescopic bolt is rotatably connected to the inner side of the fixing frame, and the fixing frame is fixedly connected to the screws through the mounting holes opened on the upper mounting frame and the lower mounting frame. The fixing frame is composed of four independent support rods, the top of which is an integrated board, and the upper mounting frame and the lower mounting frame each have two sets of clamping mechanisms.

[0010] Preferably, the telescopic bolt is threadedly connected to the connecting pile, the outer end of the telescopic bolt passes through the fixing frame and is fixedly connected to a rotating handle, and the inner side of the movable end of the electric telescopic rod is fixedly connected to a limiting rod.

[0011] Preferably, the bottom of the limiting rod is rotatably connected to the spring telescopic rod, and the other end of the spring telescopic rod is rotatably connected to the anti-slip auxiliary brick.

[0012] Preferably, the inner end of the electric telescopic rod is fixedly connected to a rubber brick, and the rubber brick is rotatably connected to the anti-slip auxiliary brick.

[0013] Preferably, the fixing mechanism further includes two rotation shaft balls, and the two rotation shaft balls are fixedly mounted on the inner sides of the upper mounting frame and the lower mounting frame respectively.

[0014] Preferably, the outer side of the rotating shaft ball is rotatably connected to the rotating rod, the inner side of the rotating rod is provided with a threaded connecting rod, the threaded connecting rod is threadedly connected to the rotating rod, and the top of the rotating rod is fixedly connected to the rotating shaft.

[0015] Preferably, the outer side of the rotating rod is rotatably connected to the first clamping plate and the second clamping plate, and the outer sides of the first clamping plate and the second clamping plate are fixedly connected to the threaded cylinder.

[0016] Preferably, the threaded barrels on the first clamping plate and the second clamping plate are tightly fitted, a second fastening bolt is provided on the inner side of the threaded barrel, the threaded barrel is threadedly connected to the second fastening bolt, the threaded barrel on the second clamping plate is a single barrel, and the threaded barrel on the first clamping plate is a double barrel, and the size of the single barrel on the second clamping plate is engaged with the double barrel on the first clamping plate to form a complete threaded barrel.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. In order to make the three-ring reducer more stable, the present invention uses the clamping mechanism of the upper mounting frame and the lower mounting frame to fix the equipment, screw the telescopic bolt, move the connecting pile inward, and drive the electric telescopic rod to move inward synchronously until the rubber brick contacts the equipment, start the electric telescopic rod, and apply force in multiple directions to firmly clamp the reducer. At the same time, when the rubber brick is clamped, the rear spring telescopic rod pushes the anti-slip auxiliary brick to rotate inward, contacting the surface of the equipment, and transferring the force applied by the spring telescopic rod to the surface of the equipment. The spring telescopic rod is connected to the limit rod and the anti-slip auxiliary brick through rotation, thereby expanding the rotation range of the anti-slip auxiliary brick, thereby increasing the contact area with the equipment surface. With the help of multiple telescopic bolts, the position of the reducer can also be adjusted to improve the adaptability of the structure. By increasing the contact area with the surfaces of equipment of various appearances and sizes, the clamping stability is increased, and the problem of poor anti-shake effect caused by loose fixation between the equipment and the equipment, resulting in damage to the equipment due to shaking and increased production costs, is avoided.

[0018] 2. In order to further enhance the stability of the structure of the equipment of the present invention, the rotating rod is rotatably connected to the rotating shaft ball of the upper mounting frame and the lower mounting frame. After the clamping device is fixed, the rotating rod is rotated to the stable structure around the equipment, and its threaded connecting rod is rotated to drive the first clamping plate and the second clamping plate to move so that the clamping range reaches the stable structure. At this time, the first clamping plate and the second clamping plate are rotated to overlap, and then they are fixed by the synchronously overlapping threaded barrel and the second fastening bolt, thereby further improving the stability of the three-ring reducer brought by the overall structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a main structural perspective diagram of a high-seismic-resistant installation structure for a three-ring reducer according to the present invention; Figure 2 This is a disassembled three-dimensional diagram of the structure of a high-seismic-resistant installation structure for a three-ring reducer according to the present invention; Figure 3 This is a three-dimensional diagram of the clamping mechanism in a high-seismic-resistant mounting structure for a three-ring reducer according to the present invention; Figure 4This is an exploded view of the fixing mechanism in a high-seismic-resistant mounting structure of a three-ring reducer according to the present invention; Figure 5 This is a partially exploded perspective view of the clamping mechanism in a highly seismic-resistant mounting structure for a three-ring reducer according to the present invention; Figure 6 This is a front view of a high-seismic-resistant installation structure for a three-ring reducer according to the present invention; Figure 7 This is a side view of a high-seismic-resistant installation structure for a three-ring reducer according to the present invention.

[0020] In the figure: 1. Upper mounting frame; 2. Lower mounting frame; 3. First fastening bolt; 4. Clamping mechanism; 401. Sliding hole; 402. Fixing frame; 403. Telescopic bolt; 404. Connecting pile; 405. Electric telescopic rod; 406. Rubber brick; 407. Limiting rod; 408. Spring telescopic rod; 409. Anti-slip auxiliary brick; 5. Fixing mechanism; 501. Rotating ball; 502. Rotating rod; 503. Threaded connecting rod; 504. First clamping plate; 505. Threaded cylinder; 506. Second clamping plate; 507. Second fastening bolt. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0022] Example 1, according to Figure 1 - Figure 4As shown, a high-seismic-resistant mounting structure for a three-ring reducer includes an upper mounting frame 1, a lower mounting frame 2, a clamping mechanism 4 and a fixing mechanism 5. The lower mounting frame 2 is rotatably connected to the outside of the upper mounting frame 1, the clamping mechanism 4 is arranged on the outside of the upper mounting frame 1 and the lower mounting frame 2, and the fixing mechanism 5 is rotatably connected to the inside of the upper mounting frame 1 and the lower mounting frame 2. The clamping mechanism 4 includes a lower limit rod 407, a spring telescopic rod 408 and an anti-slip auxiliary block. One end of the spring telescopic rod 408 is limited by the lower limit rod 407, so that the spring telescopic rod 408 can push the anti-slip auxiliary brick 409 to rotate and change position, which can automatically increase the clamping area of the installed equipment. The fixing mechanism 5 includes a rotating shaft ball 501 and a rotating rod 502. By rotating, the anti-slip auxiliary block 409 can be rotated on the outside of the rotating shaft ball 501. Side rotation can increase the applicability of the installation. The clamping mechanism 4 also includes multiple fixing frames 402, and the multiple fixing frames 402 are respectively fixedly mounted on the outside of the upper mounting frame 1 and the lower mounting frame 2. The outer sides of the upper mounting frame 1 and the lower mounting frame 2 are provided with multiple sliding holes 401, and the inner sides of the sliding holes 401 are provided with electric telescopic rods 405. The outer sides of the electric telescopic rods 405 are fixedly connected with connecting piles 404, and the inner sides of the fixing frames 402 are rotatably connected with telescopic bolts 403. The fixing frames 402 are fixedly connected with screws through the mounting holes opened on the upper mounting frame 1 and the lower mounting frame 2. The fixing frames 402 are composed of four independent support rods with an integrated board on the top. The upper mounting frame 1 and the lower mounting frame 2 each have two sets of clamping mechanisms 4).

[0023] The effect achieved by the entire embodiment 1 is as follows: the clamping mechanism 4 equipped with the upper mounting frame 1 and the lower mounting frame 2 starts preliminary work. When it is necessary to fix the equipment, the telescopic bolt 403 is first screwed. Due to the threaded linkage between it and the connecting pile 404, as the telescopic bolt 403 rotates, the connecting pile 404 begins to move steadily inward, and the connecting pile 404 is connected to the electric telescopic rod 405. Therefore, when the connecting pile 404 moves inward, it also drives the electric telescopic rod 405 to move inward synchronously. At this time, the various components work closely together to make it close to the preset target equipment. The telescopic bolt 403 is continuously screwed until the rubber brick is 406 touches the surface of the equipment. The rubber brick 406 is soft and has a certain friction, which can not only avoid hard damage to the equipment, but also play a preliminary buffering and positioning role. At this time, the equipment is in a relatively stable initial contact state. In order to further achieve stability, the electric telescopic rod 405 is then started. The electric telescopic rod 405 uses its telescopic properties. Multiple electric telescopic rods 405 work simultaneously from multiple directions, so that they can accurately adjust their own telescopic length and force direction according to the shape, size and installation requirements of the equipment, contact and fit with the equipment, and finally achieve stability, thereby preliminarily fixing the equipment.

[0024] Example 2, according to Figure 1 - Figure 5 and Figure 6As shown, the telescopic bolt 403 is threadedly connected to the connecting pile 404, the outer end of the telescopic bolt 403 passes through the fixed frame 402 and is fixedly connected to the rotating handle, the inner side of the movable end of the electric telescopic rod 405 is fixedly connected to the limit rod 407, the bottom of the limit rod 407 is rotatably connected to the spring telescopic rod 408, the other end of the spring telescopic rod 408 is rotatably connected to the anti-slip auxiliary brick 409, the inner end of the electric telescopic rod 405 is fixedly connected to the rubber brick 406, and the rubber brick 406 is rotatably connected to the anti-slip auxiliary brick 409.

[0025] The effect achieved by the entire embodiment 2 is as follows: when the rubber brick 406 clamps the equipment, the spring telescopic rod 408 at the back pushes the anti-slip auxiliary brick 409 to rotate inward until it contacts the surface of the equipment, and transmits the force of the spring telescopic rod 408 to the surface of the equipment. At the same time, the spring telescopic rod 408 is connected to the limit rod 407 and the anti-slip auxiliary brick 409 through rotation, thereby expanding the rotation range of the anti-slip auxiliary brick 409 and increasing the contact area with the surface of the equipment. By using multiple telescopic bolts 403 to cooperate with each other, the position of the reducer can be adjusted, and the adaptability of the structure to different equipment can be improved. By expanding the contact area with the surfaces of equipment of various appearances and sizes, the clamping stability of the equipment is enhanced.

[0026] Example 3, according to Figure 2 - Figure 7 As shown, the fixing mechanism 5 also includes two rotating shaft balls 501, which are fixedly mounted on the inner sides of the upper mounting frame 1 and the lower mounting frame 2 respectively. The outer sides of the rotating shaft balls 501 are rotatably connected to the rotating rod 502. The inner side of the rotating rod 502 is provided with a threaded connecting rod 503, which is threadedly connected to the rotating rod 502. The top of the rotating rod 502 is fixedly connected to the rotating shaft, and the outer side of the rotating rod 502 is rotatably connected to the first clamping plate 504 and the second clamping plate 506. The first clamping plate 504 and the second A threaded barrel 505 is fixedly connected to the outer side of the clamping plate 506. The threaded barrel 505 on the first clamping plate 504 and the second clamping plate 506 fits tightly. A second fastening bolt 507 is provided on the inner side of the threaded barrel 505. The threaded barrel 505 is threadedly connected to the second fastening bolt 507. The threaded barrel 505 on the second clamping plate 506 is a single barrel, and the threaded barrel on the first clamping plate 504 is a double barrel. The size of the single barrel on the second clamping plate 506 is engaged with the double barrel on the first clamping plate 504 to form a complete threaded barrel 505.

[0027] The effect achieved by the entire embodiment 3 is as follows: the rotating rod 502 is connected to the rotating shaft ball 501 of the upper mounting frame 1 and the lower mounting frame 2 by rotation. After the equipment is clamped and fixed, the rotating rod 502 is turned to the stable structure around the equipment, and then the threaded connecting rod 503 in the rotating rod 502 prompts the first clamping plate 504 and the second clamping plate 506 to move accordingly so that their clamping range can touch the stable structure. At this time, the first clamping plate 504 and the second clamping plate 506 are rotated to make the two overlap, and then the overlapping threaded cylinder 505 and the second fastening bolt 507 are used to fix the overlapping clamping plates.

[0028] The working principle of the whole equipment is as follows: in order to make the three-ring reducer more stable, the clamping mechanism 4 on the upper mounting frame 1 and the lower mounting frame 2 is fixed to the equipment to be fixed, and the connecting pile 404 is driven to move inward by screwing the telescopic bolt 403 to form a threaded relationship with the connecting pile 404. At this time, the electric telescopic rods 405 on the connecting pile 404 move inward at the same time until each electric telescopic rod 405 drives the rubber brick 406 thereon to contact the clamped equipment. After that, by starting each electric telescopic rod 405, multiple electric telescopic rods 405 drive the rubber brick 406 thereon at the same time, so that the rubber bricks 406 in multiple directions exert force on each other to firmly clamp the equipment. At the same time, in order to increase the clamping mechanism 4 Regarding the clamping contact surface of the equipment, when multiple rubber bricks 406 clamp the three-ring reducer at the same time, the rotating anti-slip auxiliary bricks 409 on the rubber bricks 406 are pushed inward by the spring telescopic rod 408 on the rear side until the anti-slip auxiliary bricks 409 contact the surface of the clamped equipment, and all the force of the spring telescopic rod 408 is transferred to apply pressure on the surface of the clamped equipment. At this time, the two sides of the spring telescopic rod 408 are connected to the limit rod 407 and the anti-slip auxiliary bricks 409 by rotation, thereby increasing the range of rotation of the anti-slip auxiliary bricks 409 and increasing the contact surface with the clamped equipment. The position of the three-ring reducer can be adjusted by the mutual cooperation between multiple telescopic bolts 403, thereby increasing the adaptability of this structure.

[0029] In order to enhance the stability of this structure, the rotating rod 502 is first used, which is connected to the rotating shaft balls 501 on the upper mounting frame 1 and the lower mounting frame 2 in a rotating form, so that the rotating rod 502 can be flexibly rotated within a certain range, which provides convenience for subsequent operations. After completing the clamping and fixing steps of the equipment, further stabilization operations are required. The rotating rod 502 is rotated until it is close to the stable structure around the clamped equipment, which can enable subsequent reinforcement actions to be accurately positioned. Subsequently, the threaded connecting rod 503 inside the rotating rod 502 is used for further adjustment. The threaded connecting rod 503 is rotated. Since it has a linkage relationship with the first clamping plate 504 and the second clamping plate 506, as the threaded connecting rod 503 rotates, the first The clamping plate 504 and the second clamping plate 506 begin to move, and the threaded connecting rod 503 is continuously rotated until the clamping range of the first clamping plate 504 and the second clamping plate 506 can just touch the stable structure around the equipment to ensure the effectiveness of the reinforcement. Finally, in order to completely fix it, the first clamping plate 504 and the second clamping plate 506 are rotated so that they overlap with each other. At this time, the threaded barrel 505 on the first clamping plate 504 and the second clamping plate 506 also overlaps. Then, the second fastening bolt 507 is screwed by hand. As the bolt is tightened, the first clamping plate 504 and the second clamping plate 506 are firmly fixed together, which enhances the stability of the entire structure when clamping the equipment and ensures the safety and reliability of the equipment during subsequent use.

[0030] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A highly seismic-resistant mounting structure for a three-ring reducer, comprising an upper mounting frame (1), a lower mounting frame (2), a clamping mechanism (4) and a fixing mechanism (5), characterized in that: The lower mounting frame (2) is rotatably connected to the outside of the upper mounting frame (1), the clamping mechanism (4) is arranged on the outside of the upper mounting frame (1) and the lower mounting frame (2), and the fixing mechanism (5) is rotatably connected to the inside of the upper mounting frame (1) and the lower mounting frame (2); The clamping mechanism (4) includes a lower limiting rod (407), a spring telescopic rod (408) and an anti-slip auxiliary block. The lower limiting rod (407) limits one end of the spring telescopic rod (408), so that the spring telescopic rod (408) can push the anti-slip auxiliary block (409) to rotate and change position, and can automatically increase the clamping area of the installed equipment; The fixing mechanism (5) comprises a rotating shaft ball (501) and a rotating rod (502), and can be rotated outside the rotating shaft ball (501), thereby increasing the applicability of the installation.

2. The high-seismic-resistance mounting structure for a three-ring reducer according to claim 1, characterized in that: The clamping mechanism (4) further comprises a plurality of fixing frames (402), wherein the plurality of fixing frames (402) are respectively fixedly mounted on the outer sides of the upper mounting frame (1) and the lower mounting frame (2), and the outer sides of the upper mounting frame (1) and the lower mounting frame (2) are both provided with a plurality of sliding holes (401).

3. The high-seismic-resistance mounting structure for a three-ring reducer according to claim 2, characterized in that: An electric telescopic rod (405) is provided on the inner side of each sliding hole (401), a connecting pile (404) is fixedly connected to the outer side of each electric telescopic rod (405), a telescopic bolt (403) is rotatably connected to the inner side of each fixing frame (402), and the fixing frame (402) is fixedly connected to the screws through the mounting holes provided on the upper mounting frame (1) and the lower mounting frame (2). The fixing frame (402) is composed of four independent support rods, the top of which is an integrated board, and the upper mounting frame (1) and the lower mounting frame (2) each have two sets of clamping mechanisms (4).

4. The high-seismic-resistance mounting structure for a three-ring reducer according to claim 3 is characterized in that: The telescopic bolt (403) is threadedly connected to the connecting pile (404); the outer end of the telescopic bolt (403) passes through the fixing frame (402) and is fixedly connected to a rotating handle; the inner side of the movable end of the electric telescopic rod (405) is fixedly connected to a limiting rod (407).

5. The high-seismic-resistance mounting structure for a three-ring reducer according to claim 2, characterized in that: The bottom of the limiting rod (407) is rotatably connected to the spring telescopic rod (408), and the other end of the spring telescopic rod (408) is rotatably connected to the anti-slip auxiliary brick (409).

6. The high-seismic-resistance mounting structure for a three-ring reducer according to claim 3, characterized in that: The inner end of the electric telescopic rod (405) is fixedly connected to a rubber brick (406), and the rubber brick (406) is rotatably connected to the anti-slip auxiliary brick (409).

7. The high-seismic-resistance mounting structure for a three-ring reducer according to claim 1, characterized in that: The fixing mechanism (5) further comprises two rotating shaft balls (501), and the two rotating shaft balls (501) are respectively fixedly mounted on the inner sides of the upper mounting frame (1) and the lower mounting frame (2).

8. The high-seismic-resistance mounting structure for a three-ring reducer according to claim 1, characterized in that: The outer side of the rotating shaft ball (501) is rotatably connected to the rotating rod (502), the inner side of the rotating rod (502) is provided with a threaded connecting rod (503), the threaded connecting rod (503) is threadedly connected to the rotating rod (502), and the top of the rotating rod (502) is fixedly connected to the rotating shaft.

9. The high-seismic-resistance mounting structure for a three-ring reducer according to claim 2, characterized in that: The outer side of the rotating rod (502) is rotatably connected to a first clamping plate (504) and a second clamping plate (506), and the outer sides of the first clamping plate (504) and the second clamping plate (506) are fixedly connected to a threaded barrel (505).

10. The high-seismic-resistance mounting structure for a three-ring reducer according to claim 9, characterized in that: The threaded barrel (505) on the first clamping plate (504) and the second clamping plate (506) are tightly fitted, and a second fastening bolt (507) is provided on the inner side of the threaded barrel (505). The threaded barrel (505) is threadedly connected to the second fastening bolt (507). The threaded barrel (505) on the second clamping plate (506) is a single barrel, and the threaded barrel on the first clamping plate (504) is a double barrel. The size of the single barrel on the second clamping plate (506) is engaged with the double barrel on the first clamping plate (504) to form a complete threaded barrel (505).

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