Electromagnetic flowmeter pipe fixing device

Abstract

The utility model discloses a kind of electromagnetic flowmeter pipeline fixing devices, including installation backplate, fixed clamping plate and movable clamping plate, the side fixed mounting of installation backplate is provided with installation nail, installation backplate is fixedly installed on wall by installation nail, the other side of installation backplate is provided with fixed plate, the surface of fixed plate is rotatably connected with height adjusting screw rod, the surface of height adjusting screw rod is threadedly connected with height adjusting plate, the side of height adjusting plate is movably connected with the surface of installation backplate, the other side of height adjusting plate is fixedly installed with two groups of positioning plate.The utility model is by setting height adjusting screw rod, first worm wheel and first worm, the height of fixing device is adjusted, so that device can adapt to the pipeline height demand in different installation environment, avoid the installation difficulty or stress concentration problem caused by height mismatch, to improve installation flexibility and application range.

Description

Technical Field

[0001] This utility model relates to the technical field of pipeline fixing devices, and in particular to an electromagnetic flowmeter pipeline fixing device. Background Technology

[0002] As an instrument for measuring the flow rate of conductive liquids, the electromagnetic flowmeter's core measuring element—the sensor section—is typically manufactured using a special metal pipe section that is high-hardness, wear-resistant, and lined with an insulating lining (such as polyurethane or ceramic). This pipe section not only needs to ensure the electrical insulation of the fluid to effectively cut magnetic field lines and generate induced electromotive force, but its internal geometry and flow field stability are also directly related to the accuracy of flow measurement. Therefore, when installing this section of pipe in an industrial pipeline system, extremely high requirements are placed on its support and fixation. Deformation and stress caused by external forces, vibrations, or its own weight must be minimized to ensure the stability of its inner wall shape and axial position.

[0003] Currently, common electromagnetic flowmeter pipeline fixing devices are mostly simple metal clamps or support brackets welded to the pipe wall. These structures are mostly rigid connections, and once their installation height and spatial position are fixed, they are difficult to adjust. In complex installation environments, this inherent method makes it difficult to achieve precise alignment and seamless connection with pipes or support structures of different specifications. Forced installation will introduce additional stress, causing micro-deformation of the pipe section and affecting the internal flow field distribution.

[0004] Therefore, how to provide a pipeline fixing device for electromagnetic flowmeters is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] One objective of this invention is to provide an electromagnetic flowmeter pipeline fixing device, which solves the problems mentioned in the background art.

[0006] An electromagnetic flowmeter pipeline fixing device according to an embodiment of the present invention includes a mounting back plate, a fixed clamping plate, and a movable clamping plate. A mounting nail is fixedly installed on one side of the mounting back plate, which is then fixed to a wall via the mounting nail. A fixed plate is provided on the other side of the mounting back plate. A height adjusting screw is rotatably connected to the surface of the fixed plate, and a height adjusting plate is threaded onto the surface of the height adjusting screw. One side of the height adjusting plate is movably connected to the surface of the mounting back plate, and two sets of positioning plates are fixedly installed on the other side of the height adjusting plate. A first rotating component is fixedly installed on the top of one set of positioning plates, and a second rotating component is fixedly installed on the lower surface of the other set of positioning plates. A pressing component is movably connected inside the second rotating component. A movable clamping plate is fixedly installed at the bottom end of the pressing component, and a fixed clamping plate is fixedly installed at the top end of the first rotating component. The movable clamping plate is located directly above the fixed clamping plate, and the pipe body is movably clamped between the fixed clamping plate and the movable clamping plate.

[0007] The top end of the height adjusting screw passes through the fixing plate and extends above the fixing plate. A first worm gear is fixedly connected to the top end of the height adjusting screw. A first worm is rotatably connected to the surface of the fixing plate corresponding to the position of the first worm gear. The first worm and the first worm gear mesh with each other.

[0008] A guide rod parallel to the height adjustment screw is fixedly installed on the inner side of the fixed plate, and the height adjustment plate is movably sleeved on the surface of the guide rod.

[0009] A protective cover is fixedly connected to the surface of the fixed plate at the position corresponding to the first worm gear and the first worm. The protective cover is movably sleeved on the surface of the first worm gear and the first worm. The two ends of the first worm are rotatably connected to the protective cover.

[0010] The first rotating component includes a first positioning ring and a first rotating block. The first positioning ring is fixedly installed on the upper surface of a set of positioning plates, and the first rotating block is rotatably connected to the inner side of the first positioning ring.

[0011] The second rotating component includes a second positioning ring, a rotating ring, a guide tube, a movable tube, a second worm gear, and a second worm. The second positioning ring is fixedly installed on the lower surface of another set of positioning plates. The rotating ring is rotatably connected to the inner side of the second positioning ring. The guide tube is fixedly connected to the top of the rotating ring. The top end of the guide tube passes through the positioning plate and extends to the top of the positioning plate. The movable tube is fixedly connected to the top of the guide tube. The second worm gear is fixedly sleeved on the surface of the guide tube near the top. The second worm is rotatably connected to the surface of the positioning plate at the position corresponding to the second worm gear. The second worm and the second worm gear mesh with each other.

[0012] The extrusion component includes an internally threaded tube and an extrusion screw. The internally threaded tube is movably connected inside the guide tube, and the extrusion screw is threadedly connected inside the internally threaded tube. The extrusion screw is rotatably connected inside the movable tube, and the top end of the extrusion screw passes through the movable tube and extends above the movable tube.

[0013] A ratchet is fixedly installed at the top of the extrusion screw. A fixing block is fixedly installed on the surface of the movable tube corresponding to the position of the ratchet. A pawl is rotatably connected to the top of the fixing block. A torsion spring is movably sleeved between the top of the fixing block and the pawl. The top of the torsion spring is fixedly connected to the lower surface of the pawl. The bottom end of the tension spring is fixedly connected to the top of the fixing block. The pawl is movably engaged with the surface of the ratchet. A knob is fixedly installed at the top of the ratchet, one end of the first worm, and one end of the second worm.

[0014] The fixed clamp is fixedly installed on the top of the first rotating block, and the movable clamp is fixedly installed on the bottom of the guide tube. The fixed clamp and the movable clamp are designed in a "V" shape, and protective pads are fixedly installed on the opposite surfaces of the fixed clamp and the movable clamp.

[0015] The beneficial effects of this utility model are: By setting a height adjustment screw, a first worm gear, and a first worm, the height of the fixing device is adjustable, enabling the device to adapt to the pipe height requirements in different installation environments. This avoids installation difficulties or stress concentration problems caused by height mismatch, thereby improving installation flexibility and applicability.

[0016] By utilizing the first and second rotating components, especially the second worm gear and the second worm in the second rotating component, the rotation angle of the movable clamping plate and the clamped pipe can be precisely controlled, thereby adjusting the spatial position of the clamped pipe, ensuring accurate alignment between the pipe and the electromagnetic flowmeter, reducing installation errors, and improving the accuracy and reliability of the pipe connection.

[0017] The fixed and movable clamps feature a "V"-shaped design and are equipped with protective pads, which not only enhances the stability of the clamping but also effectively buffers the clamping force, preventing damage to the pipe surface. At the same time, it reduces the additional stress introduced by the rigid connection, protects the internal flow field distribution of the pipe, and avoids the impact of micro-deformation on measurement accuracy.

[0018] The ratchet and pawl mechanism in the extrusion piece, combined with knob operation, makes the clamping and releasing process more convenient and controllable, allows for fine adjustment of clamping force and prevents accidental loosening, improves the convenience and reliability of operation, and simplifies the installation and maintenance process. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a three-dimensional structural diagram of an electromagnetic flowmeter pipeline fixing device proposed in this utility model.

[0020] Figure 2 This is a three-dimensional cross-sectional structural diagram of the extrusion component position in an electromagnetic flowmeter pipeline fixing device proposed in this utility model.

[0021] Figure 3 This is a three-dimensional cross-sectional view of the position of the second rotating component in the pipeline fixing device for an electromagnetic flowmeter proposed in this utility model.

[0022] Figure 4 This is an exploded three-dimensional structural diagram of an electromagnetic flowmeter pipeline fixing device proposed in this utility model.

[0023] Figure 5 The present invention proposes an electromagnetic flowmeter pipeline fixing device. Figure 4 A magnified structural diagram of point A in the middle.

[0024] The attached diagram shows: 1. Mounting backplate; 2. Fixed clamping plate; 3. Movable clamping plate; 4. Mounting nail; 5. Fixed plate; 6. Height adjustment screw; 7. Height adjustment plate; 8. Positioning plate; 9. First rotating component; 10. Second rotating component; 11. Extrusion component; 12. Tube body; 13. First worm gear; 14. First worm; 15. Guide rod; 16. Protective cover; 17. First positioning ring; 18. First rotating block; 19. Second positioning ring; 20. Rotating ring; 21. Guide tube; 22. Movable tube; 23. Second worm gear; 24. Second worm; 25. Internally threaded tube; 26. Extrusion screw; 27. Ratchet; 28. Pad; 29. ​​Torsion spring; 30. Protective pad. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0026] refer to Figure 1-5 In this embodiment, the back plate is mounted, a fixed clamping plate is fixed, and a movable clamping plate is fixed. A mounting nail 4 is fixedly mounted on one side of the back plate 1, and the back plate 1 is fixedly mounted on the wall by the mounting nail 4. A fixed plate 5 is provided on the other side of the back plate 1. A height adjustment screw 6 is rotatably connected to the surface of the fixed plate 5. A height adjustment plate 7 is threadedly sleeved on the surface of the height adjustment screw 6. One side of the height adjustment plate 7 is movably connected to the surface of the back plate 1, and two sets of positioning plates 8 are fixedly mounted on the other side of the height adjustment plate 7.

[0027] In practice, the height adjustment plate 7 moves up and down by rotating the height adjustment screw 6. Two sets of positioning plates 8 are fixedly installed on the surface of the height adjustment plate 7, so the two sets of positioning plates 8 will move up and down synchronously with the height adjustment plate 7.

[0028] refer to Figure 1-5 In this embodiment, the top end of the height adjusting screw 6 passes through the fixing plate 5 and extends to the top of the fixing plate 5. The top end of the height adjusting screw 6 is fixedly connected to the first worm gear 13. The surface of the fixing plate 5 is rotatably connected to the first worm 14 corresponding to the position of the first worm gear 13. The first worm 14 and the first worm gear 13 mesh with each other.

[0029] In specific implementation, the cooperation between the first worm gear 14 and the first worm wheel 13 realizes the function of stable control of the height adjustment screw 6. During rotation, the rotation of the first worm gear 14 drives the rotation of the first worm wheel 13, and the rotation of the first worm wheel 13 stably drives the height adjustment screw 6, which also realizes the stepless adjustment of the height adjustment screw 6 and the self-locking function of the height adjustment screw 6, avoiding the height adjustment screw 6 from rotating due to vibration caused by shaking or vibration of the tube body 12.

[0030] refer to Figure 1-5 In this embodiment, a guide rod 15 parallel to the height adjustment screw 6 is fixedly installed on the inner side of the fixing plate 5, and the height adjustment plate 7 is movably sleeved on the surface of the guide rod 15.

[0031] In practice, the guide rod 15 is used to improve the stability of the height adjustment plate 7.

[0032] refer to Figure 1-5 In this embodiment, a protective cover 16 is fixedly connected to the surface of the fixed plate 5 at the position corresponding to the first worm gear 13 and the first worm 14. The protective cover 16 is movably sleeved on the surface of the first worm gear 13 and the first worm 14, and the two ends of the first worm 14 are rotatably connected to the protective cover 16.

[0033] In practice, the protective cover 16 is used to protect the positions of the first worm gear 13 and the first worm 14 to prevent the environment from affecting them. The protective cover 16 is also fixedly connected to the positions of the second worm gear 23 and the second worm 24.

[0034] refer to Figure 1-5 In this embodiment, a first rotating component 9 is fixedly installed on the top of a set of positioning plates 8. The first rotating component 9 includes a first positioning ring 17 and a first rotating block 18. The first positioning ring 17 is fixedly installed on the upper surface of a set of positioning plates 8, and the first rotating block 18 is rotatably connected to the inner side of the first positioning ring 17.

[0035] In specific implementation, the first rotating component 9 is used to drive the fixed clamping plate 2 to rotate, thereby realizing the rotation function of the fixed clamping plate 2.

[0036] refer to Figure 1-5 In this embodiment, a second rotating component 10 is fixedly installed on the lower surface of another set of positioning plates 8. The second rotating component 10 includes a second positioning ring 19, a rotating ring 20, a guide tube 21, a movable tube 22, a second worm gear 23, and a second worm 24. The second positioning ring 19 is fixedly installed on the lower surface of the other set of positioning plates 8. The rotating ring 20 is rotatably connected to the inner side of the second positioning ring 19. The guide tube 21 is fixedly connected to the top of the rotating ring 20. The top end of the guide tube 21 passes through the positioning plate 8 and extends to the top of the positioning plate 8. The movable tube 22 is fixedly connected to the top of the guide tube 21. The second worm gear 23 is fixedly sleeved on the surface of the guide tube 21 near the top. The second worm 24 is rotatably connected to the surface of the positioning plate 8 at the position corresponding to the second worm gear 23. The second worm 24 and the second worm gear 23 mesh with each other.

[0037] In specific implementation, the rotation of the second worm 24 will drive the rotation of the second worm wheel 23, and the rotation of the second worm wheel 23 will drive the guide tube 21 and the movable tube 22 to rotate synchronously. The cooperation between the second worm 24 and the second worm wheel 23 realizes the stepless rotation of the guide tube 21 and also realizes the self-locking function, improving the stability of the guide tube 21. The second rotating component 10 is used to drive the rotation of the movable clamping plate 3, realizing the rotation function of the movable clamping plate 3. When the clamping state is downward, when the second rotating component 10 controls the rotation, the movable clamping plate 3 will drive the first rotating component 9 to rotate through the tube body 12, thereby realizing the adjustment of the angle of the tube body 12.

[0038] refer to Figure 1-5 In this embodiment, the second rotating member 10 is movably connected to an extrusion member 11. The movable clamping plate 3 is fixedly installed at the bottom end of the extrusion member 11. The extrusion member 11 includes an internally threaded tube 25 and an extrusion screw 26. The internally threaded tube 25 is movably connected to the inside of the guide tube 21. The extrusion screw 26 is threadedly connected to the inside of the internally threaded tube 25. The extrusion screw 26 is rotatably connected to the inside of the movable tube 22. The top end of the extrusion screw 26 passes through the movable tube 22 and extends to the top of the movable tube 22. A guide strip is fixedly connected to the side of the internally threaded tube 25. A movable guide groove is opened on the inner wall of the guide tube 21 corresponding to the position of the guide strip. The guide strip is movably engaged in the inside of the movable guide groove. In this way, the internally threaded tube 25 will move up and down along the movable guide groove on the inner wall of the guide tube 21.

[0039] The fixed clamp 2 is fixedly installed on the top of the first rotating part 9, and the movable clamp 3 is located directly above the fixed clamp 2. The fixed clamp 2 and the movable clamp 3 movably clamp the tube body 12.

[0040] In practice, the fixed clamp 2 and the movable clamp 3 are clamped on the surface of the tube body 12 to improve the stability of the tube body 12. The fixed clamp 2 and the movable clamp 3 are relatively wide, which further improves the stability of the tube body 12.

[0041] refer to Figure 1-5 In this embodiment, a ratchet 27 is fixedly installed at the top of the extrusion screw 26, and a fixing block is fixedly installed on the surface of the movable tube 22 corresponding to the position of the ratchet 27. A pawl 28 is rotatably connected to the top of the fixing block, and a torsion spring 29 is movably sleeved between the top of the fixing block and the pawl 28. The top of the torsion spring 29 is fixedly connected to the lower surface of the pawl 28, and the bottom end of the tension spring is fixedly connected to the top of the fixing block. The pawl 28 is movably engaged on the surface of the ratchet 27. A knob is fixedly installed at the top of the ratchet 27, one end of the first worm 14, and one end of the second worm 24.

[0042] In practical implementation, this technical solution is used to stabilize the extrusion screw 26, prevent the extrusion screw 26 from rotating in the opposite direction, and improve the stability of the extrusion screw 26. The pawl 28 is engaged on the surface of the ratchet 27, so that there is resistance between the pawl 28 and the ratchet 27. When the movable tube 22 and the guide tube 21 rotate synchronously, the ratchet 27 will be driven to rotate through the pawl 28. The rotation of the ratchet 27 will drive the extrusion screw 26 to move synchronously, so that the extrusion screw 26 moves with the movable tube 22. When it is necessary to rotate on its own, the extrusion screw 26 can be rotated alone.

[0043] refer to Figure 1-5 In this embodiment, the fixed clamping plate 2 is fixedly installed on the top of the first rotating block 18, and the movable clamping plate 3 is fixedly installed on the bottom of the guide tube 21. The fixed clamping plate 2 and the movable clamping plate 3 are designed in a "V" shape, and protective pads 30 are fixedly installed on the opposite surfaces of the fixed clamping plate 2 and the movable clamping plate 3.

[0044] In practice, the "V"-shaped design facilitates clamping of tubes 12 of different thicknesses, and the internal protective pad 30 is used to protect the surface of the tube 12.

[0045] The working principle of this utility model is as follows: First, the mounting back plate 1 is fixed to the wall using mounting nails 4. Then, the first worm gear 14 is rotated to drive the first worm wheel 13, causing the height adjustment screw 6 to rotate. This, in turn, drives the height adjustment plate 7 to move up and down along the guide rod 15, achieving overall height adjustment. The positioning plate 8 on the height adjustment plate 7 fixes the first rotating component 9 and the second rotating component 10 respectively. The first rotating component 9 is connected to the fixed clamping plate 2 via the first rotating block 18, and the second rotating component 10 is connected to the movable clamping plate 3 via the rotating ring 20 and the guide tube 21. The tube body 12 is placed on the fixed clamping plate 2, and then the pressing screw 26 is rotated. The pressing screw 26 pushes the internally threaded tube 25 along... The guide tube 21 moves downward, and the internal thread tube 25 moves downward, which pushes the movable clamping plate 3 to move downward and closer to the tube body 12 until the movable clamping plate 3 is tightly clamped at the top of the tube body 12. Together with the fixed clamping plate 2, it achieves stable clamping of the tube body 12. The ratchet 27 rotates synchronously with the extrusion screw 26 and is positioned by the pawl 28 to prevent the ratchet 27 from reversing. Secondly, it also increases the resistance between the two, so that when the movable tube 22 rotates, it drives the extrusion screw 26 to rotate synchronously, avoiding the extrusion screw 26 from loosening during rotation. Furthermore, even if it loosens, rotating the extrusion screw 26 again can achieve tight fixation of the tube body 12. The second worm gear 24 is rotated to drive the second worm wheel 23 to rotate. The rotation of the second worm wheel 23 will adjust the angle of the guide tube 21. The adjustment of the rotation angle of the guide tube 21 will drive the movable clamping plate 3, the fixed tube body 12 and the fixed clamping plate 2 to rotate synchronously, thereby rotating the tube body 12 and adjusting the angle of the tube body 12. At the same time, the "V" shaped design and the protective pad 30 buffer the clamping force to ensure the alignment of the pipe and reduce stress.

[0046] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A pipeline fixing device for an electromagnetic flowmeter, characterized in that, The device includes a mounting back plate (1), a fixed clamping plate (2), and a movable clamping plate (3). A mounting nail (4) is fixedly installed on one side of the mounting back plate (1). The mounting back plate (1) is fixedly installed on the wall by the mounting nail (4). A fixing plate (5) is provided on the other side of the mounting back plate (1). A height adjustment screw (6) is rotatably connected to the surface of the fixing plate (5). A height adjustment plate (7) is threaded onto the surface of the height adjustment screw (6). One side of the height adjustment plate (7) is movably connected to the surface of the mounting back plate (1). Two sets of positioning plates (8) are fixedly installed on the other side of the height adjustment plate (7). A first rotating component (9) is fixedly installed on the top of one set of positioning plates (8), and a second rotating component (10) is fixedly installed on the lower surface of another set of positioning plates (8). An extrusion component (11) is movably connected inside the second rotating component (10). A movable clamping plate (3) is fixedly installed at the bottom end of the extrusion component (11), and a fixed clamping plate (2) is fixedly installed at the top end of the first rotating component (9). The movable clamping plate (3) is located directly above the fixed clamping plate (2), and the tube body (12) is movably clamped between the fixed clamping plate (2) and the movable clamping plate (3).

2. The electromagnetic flowmeter pipeline fixing device according to claim 1, characterized in that, The top end of the height adjusting screw (6) passes through the fixing plate (5) and extends to the top of the fixing plate (5). The top end of the height adjusting screw (6) is fixedly connected to the first worm wheel (13). The surface of the fixing plate (5) is rotatably connected to the first worm (14) corresponding to the position of the first worm wheel (13). The first worm (14) and the first worm wheel (13) mesh with each other.

3. The electromagnetic flowmeter pipeline fixing device according to claim 2, characterized in that, The inner side of the fixed plate (5) is fixedly installed with a guide rod (15) parallel to the height adjustment screw (6), and the height adjustment plate (7) is movably sleeved on the surface of the guide rod (15).

4. The electromagnetic flowmeter pipeline fixing device according to claim 3, characterized in that, A protective cover (16) is fixedly connected to the surface of the fixed plate (5) at the position corresponding to the first worm wheel (13) and the first worm (14). The protective cover (16) is movably sleeved on the surface of the first worm wheel (13) and the first worm (14). The two ends of the first worm (14) are rotatably connected to the protective cover (16).

5. The electromagnetic flowmeter pipeline fixing device according to claim 4, characterized in that, The first rotating component (9) includes a first positioning ring (17) and a first rotating block (18). The first positioning ring (17) is fixedly installed on the upper surface of a set of positioning plates (8), and the first rotating block (18) is rotatably connected to the inner side of the first positioning ring (17).

6. The electromagnetic flowmeter pipeline fixing device according to claim 5, characterized in that, The second rotating component (10) includes a second positioning ring (19), a rotating ring (20), a guide tube (21), a movable tube (22), a second worm gear (23), and a second worm (24). The second positioning ring (19) is fixedly installed on the lower surface of another set of positioning plates (8). The rotating ring (20) is rotatably connected to the inner side of the second positioning ring (19). The guide tube (21) is fixedly connected to the top of the rotating ring (20). The top end of the guide tube (21) passes through the positioning plate (8) and extends to the top of the positioning plate (8). The movable tube (22) is fixedly connected to the top of the guide tube (21). The second worm gear (23) is fixedly sleeved on the surface of the guide tube (21) near the top. The second worm (24) is rotatably connected to the surface of the positioning plate (8) at the position corresponding to the second worm gear (23). The second worm (24) and the second worm gear (23) mesh with each other.

7. The electromagnetic flowmeter pipeline fixing device according to claim 6, characterized in that, The extrusion component (11) includes an internally threaded tube (25) and an extrusion screw (26). The internally threaded tube (25) is movably connected to the inside of the guide tube (21). The extrusion screw (26) is threadedly connected to the inside of the internally threaded tube (25). The extrusion screw (26) is rotatably connected to the inside of the movable tube (22). The top end of the extrusion screw (26) passes through the movable tube (22) and extends above the movable tube (22).

8. The electromagnetic flowmeter pipeline fixing device according to claim 7, characterized in that, A ratchet (27) is fixedly installed at the top of the extrusion screw (26). A fixing block is fixedly installed on the surface of the movable tube (22) corresponding to the position of the ratchet (27). A pawl (28) is rotatably connected to the top of the fixing block. A torsion spring (29) is movably sleeved between the top of the fixing block and the pawl (28). The top of the torsion spring (29) is fixedly connected to the lower surface of the pawl (28). The bottom end of the tension spring is fixedly connected to the top of the fixing block. The pawl (28) is movably engaged on the surface of the ratchet (27). A knob is fixedly installed at the top of the ratchet (27), one end of the first worm (14), and one end of the second worm (24).

9. The electromagnetic flowmeter pipeline fixing device according to claim 8, characterized in that, The fixed clamp (2) is fixedly installed on the top of the first rotating block (18), and the movable clamp (3) is fixedly installed on the bottom of the guide tube (21). The fixed clamp (2) and the movable clamp (3) are designed in a "V" shape, and protective pads (30) are fixedly installed on the opposite surfaces of the fixed clamp (2) and the movable clamp (3).

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