A multifunctional pressure monitoring support device based on a swing bridge support.

Abstract

This invention relates to the field of bridge construction technology, specifically to a multifunctional pressure monitoring support device for a rotating bridge support. The device includes: a support cylinder mounted on a walkway; a pressure sensor mounted on the lower surface of the walkway; the walkway is mounted on a slide rail; an inner support plate and an outer support plate are mounted on the slide rail; side support plates are mounted on both sides of the inner and outer support plates; and limit components are provided at the connections between the inner and outer support plates and the side support plates. The advantages are: this device can accurately sense and monitor the stress on the support itself in real time; this device is installed simultaneously with the support during construction, improving safety during bridge construction and providing reliability for rotating bridge construction.

Description

Technical Field

[0001] This invention relates to the field of bridge construction, specifically to a multifunctional pressure monitoring support device based on the support legs of a swing bridge. Background Technology

[0002] Currently, during the construction of rotating bridges, in order to ensure the safety of the bridge rotation process, support feet and slides are installed around the rotating ball joint, and a sliding plate is laid between the support feet and slides to reduce rotational friction resistance. The pressure generated on the load-bearing support points of the support foot device itself is also monitored.

[0003] Existing support devices cannot measure their own stress conditions. Instead, they use strain monitoring to convert it into pressure and then calculate the data. This method is inaccurate, cumbersome, and lacks persuasiveness and intuitiveness. It cannot monitor the actual pressure value generated by the support points of the support device.

[0004] To address these issues, this invention proposes a multifunctional pressure monitoring support device based on a slewing bridge support. Summary of the Invention

[0005] The purpose of this invention is to provide a multifunctional pressure monitoring support device based on a slewing bridge support, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a multifunctional pressure monitoring support device based on a swing bridge support, comprising a support cylinder, characterized in that: the support cylinder is disposed on a walkway, a pressure sensor is disposed on the lower surface of the walkway, the walkway is disposed on a slide rail, an inner support plate and an outer support plate are disposed on the slide rail, side support plates are disposed on both sides of the inner support plate and the outer support plate, and limit components are disposed at the connection between the inner support plate, the outer support plate and the side support plate.

[0007] Preferably, the support cylinder is provided in two sets, the two sets of support cylinders are arranged adjacent to each other, both sets of support cylinders are fixed on the walkway, and a support plate is fixed on both sets of support cylinders. A side support frame is provided between the support cylinder and the walkway, one end of the side support frame is fixedly connected to the support cylinder, and the other end of the side support frame is fixedly connected to the walkway.

[0008] Preferably, mounting holes are provided at the four corners of the surface of the walkway, and screws are fixed at the four corners of the upper surface of the pressure sensor. The screws are inserted into the mounting holes and tightened with nuts and fixed by partial welding. Inner support columns are fixed on both the inner and outer ring walls of the walkway. There are several inner support columns, which are evenly distributed on the surface of the walkway. The pressure sensor is connected to the pressure measuring instrument through a data acquisition line. The pressure measuring instrument is equipped with a linear amplifier, an A / D converter and a microprocessor (CPU).

[0009] Preferably, a base plate is fixed on the side of the inner support plate and the outer support plate facing away from the running plate, a guide post is fixed on the slide, the guide post and the base plate are slidably connected and a nut is tightened on the guide post, an inner sliding groove is opened on the side of the inner support plate and the outer support plate facing the running plate, the inner support post and the inner sliding groove are slidably connected, a sand discharge cylinder is fixed on the surface of the outer support plate facing away from the running plate, a cover plate is provided at the opening of the sand discharge cylinder, and the inner sides of the inner support plate, the outer support plate and the two sets of side support plates form an inner cavity, which is filled with quartz sand.

[0010] Preferably, slots are provided at the upper ends of both sides of the inner support plate and the outer support plate. The limiting component is located outside the slot. An insert plate is fixed on the side surface of the side support plate facing the slide plate. The insert plate is set near the upper end of the side support plate and is inserted into the slot. Connecting plates are fixed on both sides of the side support plate. Guide holes are provided on the surface of the connecting plates. A bottom block is fixed on the slide. The bottom block is located on both sides of the bottom plate. A vertical rod is fixed on the bottom block. The vertical rod is inserted into the guide hole and tightened with a nut. Two sets of hanging ears are fixed on the upper surface of the side support plate. Several evenly distributed diagonal braces are provided between the side support plate and the slide. One end of the diagonal brace is fixedly connected to the side support plate, and the other end of the diagonal brace is fixedly connected to the slide.

[0011] Preferably, the limiting component includes an outer ring, a rotating block, a rubber block, a limiting block, an inner rotating handle, and an outer rotating handle. The outer ring is fixed to the surface of the inner support plate and the outer support plate. Several rubber blocks are fixed on the inner wall of the outer ring at equal intervals. A ball groove and a through groove are provided on the inner side of the outer ring. The ball groove is annular and the center of the ball groove is circular. Several through grooves are provided and arranged in a circle with the center of the outer ring as the center. A limiting block is provided in the through groove and is located next to the rubber block.

[0012] Preferably, the limiting block is inserted into the through groove, and elastic vertical strips are fixed on the four outer walls of the limiting block. The other side of the elastic vertical strips is fixedly connected to the inner wall of the through groove. One end of the limiting block is chamfered, and several evenly distributed abutment strips are fixed at the other end of the limiting block.

[0013] Preferably, a rotating block is rotatably arranged inside the outer ring, and a number of evenly distributed movable balls are arranged on one side surface of the rotating block. The movable balls are embedded in the ball groove and roll. An inner rotating handle is fixedly arranged on the other side surface of the rotating block. An outer rotating handle is hinged to the end face of the inner rotating handle. A storage cavity is opened at the center of the surface of the inner rotating handle, and an iron block ring is fixed at the outer end of the storage cavity.

[0014] Preferably, the outer handle is rotatably provided with a rotating shaft, a magnetic ring is fixed on the surface of the outer handle, a rubber ring is laid on the surface of the rotating shaft, the rotating shaft is inserted into the storage cavity, and the magnetic ring attracts the iron block ring.

[0015] Preferably, the outer periphery of the rotating block is provided with large grooves and small grooves, and there are several of each type. The large grooves and small grooves are staggered on the outer periphery of the rotating block. The inner depth of the large groove is greater than that of the small groove. The side of the large groove away from the inner handle is provided with a chamfer. The limiting block can extend out from the large groove, and the rubber block is completely embedded in the small groove.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] The present invention proposes a multi-functional pressure monitoring support foot device based on the support foot of a rotating bridge. It can accurately sense and monitor the stress on the support foot itself in real time, and complete the installation simultaneously during the construction and installation of the support foot. This improves the safety of bridge construction and provides reliability for the rotation construction. At the same time, the support foot as a whole can serve as both a temporary support and a safety support leg during the rotation process. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the pressure measurement process of the present invention;

[0019] Figure 2 This is a schematic diagram of the overall structure of the present invention;

[0020] Figure 3 This is a side view of the overall structure of the present invention;

[0021] Figure 4 This is a partial structural diagram of the present invention;

[0022] Figure 5 for Figure 4 Enlarged view of the structure at point A in the middle;

[0023] Figure 6 This is a schematic diagram of the limiting component structure of the present invention;

[0024] Figure 7 This is a schematic diagram of the limiting block structure of the present invention;

[0025] Figure 8 This is a schematic diagram of the block structure of the present invention;

[0026] Figure 9 This is a schematic diagram of the side support plate structure of the present invention;

[0027] Figure 10 This is a schematic diagram of the board structure of the present invention;

[0028] Figure 11 This is a schematic diagram of the quartz sand structure of the present invention;

[0029] Figure 12 This is a schematic diagram of the skateboard structure of the present invention.

[0030] In the diagram: 1. Pressure sensor; 2. Pressure measuring instrument; 3. Linear amplifier; 4. A / D converter; 5. Microprocessor (CPU); 6. Display screen; 7. Support cylinder; 8. Support plate; 9. Track; 10. Diagonal brace; 11. Slide rail; 12. Side support plate; 13. Inner support plate; 14. Base plate; 15. Limiting component; 16. Side support frame; 17. Hanging lug; 18. Outer support plate; 19. Sand discharge cylinder; 20. Cover plate; 21. Guide column; 22. Inner support column; 23. Inner slide groove; 24. Connection. 25. Plate; 26. Inner cavity; 27. Bottom block; 28. Vertical rod; 29. ​​Outer ring; 30. Rubber block; 31. Rotating block; 32. Iron block ring; 33. Storage cavity; 34. Inner throttle; 35. Rotating shaft; 36. Rubber ring; 37. Magnetic ring; 38. Outer throttle; 39. Slot; 40. Limiting block; 41. Ball groove; 42. Large groove; 43. Small groove; 44. Elastic vertical bar; 45. Through groove; 46. Abutment bar; 47. Movable ball; 48. Insert plate; 49. Quartz sand; 50. Slide plate. Detailed Implementation

[0031] Example 1: Please refer to Figures 1 to 12 The present invention provides a technical solution: a multi-functional pressure monitoring support foot device based on a swing bridge support foot, including a support cylinder 7, the support cylinder 7 is disposed on a walk plate 9, a pressure sensor 1 is disposed on the lower surface of the walk plate 9, the walk plate 9 is disposed on a slide rail 11, an inner support plate 13 and an outer support plate 18 are disposed on the slide rail 11, a side support plate 12 is disposed on both sides of the inner support plate 13 and the outer support plate 18, and a limit component 15 is disposed at the connection between the inner support plate 13, the outer support plate 18 and the side support plate 12;

[0032] Mounting holes are provided at the four corners of the surface of the slide plate 9. Screws are fixed at the four corners of the upper surface of the pressure sensor 1. The screws are inserted into the mounting holes and tightened with nuts and fixed by partial welding. Inner support columns 22 are fixed on the inner ring wall and the outer ring 28 wall of the slide plate 9. There are several inner support columns 22, which are evenly distributed on the surface of the slide plate 9. The pressure sensor 1 is connected to the pressure measuring instrument through the acquisition line. The pressure measuring instrument is equipped with a linear amplifier 3, an A / D converter 4 and a microprocessor (CPU).

[0033] In use, this device can be installed with a pressure sensor 1 under the support plate 9. The pressure sensor 1 converts the pressure value into a corresponding measurable electrical signal. When the support is compressed, the pressure is transmitted to the pressure sensor 1, causing the elastic body of the pressure sensor 1 to deform. The strain gauge bridge attached to the elastic body loses its balance and outputs an electrical signal that is proportional to the weight value. The signal is amplified by the linear amplifier 3 in the pressure measuring instrument and then converted into a digital signal by A / D conversion. The microprocessor (CPU) of the instrument processes the weight signal and directly displays the weight data. Holes are reserved on the surface of the support plate 9 for connecting the acquisition line. After the support is installed, the inner support plate 13, outer support plate 18 and side support plate 12 need to be removed as a whole.

[0034] Example 2: Based on Example 1, a base plate 14 is fixed on the side of the inner support plate 13 and the outer support plate 18 away from the walking plate 9. A guide post 21 is fixed on the slide 11. The guide post 21 and the base plate 14 are slidably connected and a nut is screwed on the guide post 21. An inner sliding groove 23 is opened on the side of the inner support plate 13 and the outer support plate 18 facing the walking plate 9. The inner support post 22 and the inner sliding groove 23 are slidably connected. A sand discharge cylinder 19 is fixed on the surface of the outer support plate 18 away from the walking plate 9. A cover plate 20 is provided at the opening of the sand discharge cylinder 19. The inner support plate 13, the outer support plate 18 and the two sets of side support plates 12 form an inner cavity 25, which is filled with quartz sand 49.

[0035] When using, combine Figure 11 and Figure 12 After the inner support plate 13, outer support plate 18 and side support plate 12 are installed, quartz sand 49 is filled into the inner cavity 25. Then, the support feet are moved by the crane to align the inner support column 22 and inner slide groove 23 on the walk plate 9, so that the walk plate 9 enters the inner cavity 25 and is pressed against the quartz sand 49. Thus, when the bridge rotation operation is not carried out, the support feet can play a supporting role and improve the stability of the bridge construction. When the bridge rotation operation is carried out, the quartz sand 49 in the inner cavity 25 is discharged through the sand discharge cylinder 19, so that there is space between the pressure sensor 1 and the slide 11. Then the side support plate 12 is removed. At this time, a polytetrafluoroethylene sliding plate 50 is placed in the space to reduce the friction of the support foot device on the slide 11 and play a role in rotational safety support. The quartz sand 49 has good stability and load-bearing capacity, which can provide additional support and buffering for the support feet, further improving the stability and safety of the entire device.

[0036] Slots 38 are provided at the upper ends of both sides of the inner support plate 13 and the outer support plate 18. The limiting component 15 is located outside the slot 38. An insert plate 47 is fixed on the side surface of the side support plate 12 facing the slide plate 9. The insert plate 47 is set near the upper end of the side support plate 12 and is inserted into the slot 38. Connecting blocks are fixed on both sides of the side support plate 12. Guide holes are provided on the surface of the connecting blocks. A bottom block 26 is fixed on the slide 11. The bottom block 26 is located on both sides of the bottom plate 14. A vertical rod 27 is fixed on the bottom block 26. The vertical rod 27 is inserted into the guide hole and tightened with a nut. Two sets of hanging ears 17 are fixed on the upper surface of the side support plate 12. Several evenly distributed diagonal braces 10 are provided between the side support plate 12 and the slide 11. One end of the diagonal brace 10 is fixedly connected to the side support plate 12, and the other end of the diagonal brace 10 is fixedly connected to the slide 11.

[0037] In use, after inserting the bottom plate 14 on the inner support plate 13 and the outer support plate 18 into the guide post 21 and tightening the nut, the inner support plate 13 and the outer support plate 18 are installed. Then, the side support plate 12 is moved vertically by the crane and the provided hanging lug 17, and the insert plate 47 is inserted into the slot 38, so that the vertical rod 27 and the connecting plate 24 are aligned. The nut is then tightened on the vertical rod 27. The diagonal support rod 10 can enhance the stability and load-bearing capacity of the entire device and prevent deformation or damage when the support foot is subjected to excessive force.

[0038] Example 3: Based on Example 2, the limiting component 15 includes an outer ring 28, a rotating block 30, a rubber block 29, a limiting block 39, an inner rotating handle 33, and an outer rotating handle 37. The outer ring 28 is fixed to the surface of the inner support plate 13 and the outer support plate 18. Several rubber blocks 29 are fixed on the inner wall of the outer ring 28 at equal intervals. A ball groove 40 and a through groove 44 are provided on the inner side of the outer ring 28. The ball groove 40 is annular and the center of the ball groove 40 is circular. Several through grooves 44 are provided and arranged in a circle with the center of the outer ring 28 as the center. A limiting block 39 is provided in the through groove 44 and the limiting block 39 is located next to the rubber block 29.

[0039] The limiting block 39 is inserted into the through groove 44. Elastic vertical strips 43 are fixed on the four outer walls of the limiting block 39. The other side of the elastic vertical strips 43 is fixedly connected to the inner wall of the through groove 44. One end of the limiting block 39 is chamfered. Several evenly distributed abutment strips 45 are fixed at the other end of the limiting block 39. Large grooves 41 and small grooves 42 are provided on the outer periphery of the rotating block 30. Several large grooves 41 and small grooves 42 are provided. The large grooves 41 and small grooves 42 are staggered on the outer periphery of the rotating block 30. The inner depth of the large groove 41 is greater than the inner depth of the small groove 42. The side of the large groove 41 away from the inner handle 33 is chamfered. The limiting block 39 can extend out from the large groove 41. The rubber block 29 is completely embedded in the small groove 42.

[0040] In use, when the insert plate 47 is inserted into the slot 38, the rubber block 29 and the limiting block 39 are both located in the large groove 41, and the elastic vertical bar 43 is in its natural state. After the insert plate 47 is inserted into the slot 38, by holding and rotating the rotating shaft 34, the rotating block 30 will be rotated, thereby pressing the limiting block 39, causing the limiting block 39 to move towards the insert plate 47, so that the abutting strip 45 on the end face of the limiting block 39 presses against the insert plate 47, thereby limiting and locking the insert plate 47. At the same time, the rubber block 29 will move into the small groove 42. Since the rubber block 29 is completely embedded in the small groove 42, it can provide resistance and prevent the rotating block 30 from rotating on its own. At this time, the elastic vertical bar 43 will be stretched and store elastic potential energy.

[0041] When the limit needs to be engaged, the rotating shaft 34 is rotated, which drives the rotating block 30 to rotate, thereby causing the large groove 41 to rotate to the limit block 39 and the rubber block 29. Under the rebound action of the elastic vertical bar 43, the limit block 39 will extend out of the large groove 41, thereby canceling the limit on the insert plate 47, and the rubber block 29 will be located in the large groove 41.

[0042] A rotating block 30 is rotatably arranged inside the outer ring 28. Several evenly distributed movable balls 46 are arranged on one side surface of the rotating block 30. The movable balls 46 are embedded in the ball groove 40 and roll. An inner handle 33 is fixedly arranged on the other side surface of the rotating block 30. An outer handle 37 is hinged to the end face of the inner handle 33. A storage cavity 32 is opened at the center of the surface of the inner handle 33. An iron block ring 31 is fixed at the outer end of the storage cavity 32. A rotating shaft 34 is rotatably arranged on the surface of the outer handle 37. A magnetic ring 36 is fixed on the surface of the outer handle 37. A rubber ring 35 is laid on the surface of the rotating shaft 34. The rotating shaft 34 is inserted into the storage cavity 32. The magnetic ring 36 attracts the iron block ring 31.

[0043] During use, as the rotating block 30 rotates, the movable ball 46 rolls synchronously within the ball groove 40, providing support and guidance for the rotation of the rotating block 30 and improving its stability. By turning the outer handle 37, the rotating shaft 34 on the surface of the outer handle 37 can be inserted into the storage cavity 32. At the same time, the magnetic ring 36 attracts the iron block ring 31, preventing the outer handle 37 from moving randomly. The rubber ring 35 provides cushioning and improves stability during operation.

[0044] Working principle: In actual use, the pressure sensor 1 monitors the force on the support leg in real time, and the data is displayed in real time by the pressure measuring instrument connected by the acquisition line. The data is then displayed on the display screen 6 on the pressure measuring instrument. This achieves real-time monitoring of the force on the support leg. At the same time, during the construction of the rotating bridge, the support leg can serve as a temporary support to offset the safety hazards caused by the unbalanced moment of the bridge. During the bridge rotation construction, the quartz sand 49 is removed and polytetrafluoroethylene sliding plate 50 is placed in it to reduce the friction between the support leg device and the slide 11, which can also serve as a safety support leg during the rotation process.

[0045] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multifunctional pressure monitoring support device based on a swing bridge support, comprising: The support cylinder (7) is characterized in that: the support cylinder (7) is set on the walk plate (9), a pressure sensor (1) is set on the lower surface of the walk plate (9), the walk plate (9) is set on the slide rail (11), an inner support plate (13) and an outer support plate (18) are set on the slide rail (11), and side support plates (12) are set on both sides of the inner support plate (13) and the outer support plate (18), and limit components (15) are set at the connection between the inner support plate (13), the outer support plate (18) and the side support plate (12); the limit component (15) includes an outer ring (28), a rotating block (30), a rubber block (29), a limit block (39), an inner handle (33) and an outer handle (37), the outer ring (28) is fixed on the surface of the inner support plate (13) and the outer support plate (18), and a plurality of [missing information] are fixed on the inner wall of the outer ring (28). The rubber blocks (29) are evenly distributed. The inner side of the outer ring (28) is provided with ball grooves (40) and through grooves (44). The ball grooves (40) are circular and the center of the outer ring (28) is circular. There are several through grooves (44) arranged in a circle with the center of the outer ring (28) as the center. There is a limiting block (39) in the through groove (44) and the limiting block (39) is located next to the rubber block (29). The limiting block (39) is inserted into the through groove (44). Elastic vertical strips (43) are fixed on the four outer walls of the limiting block (39). The other side of the elastic vertical strips (43) is fixedly connected to the inner wall of the through groove (44). One end of the limiting block (39) is chamfered and several evenly distributed abutment strips (45) are fixed at the other end of the limiting block (39).

2. The multifunctional pressure monitoring support device based on a rotating bridge support according to claim 1, characterized in that: The support cylinder (7) is provided in two sets, and the two sets of support cylinders (7) are arranged adjacent to each other. Both sets of support cylinders (7) are fixed on the walk plate (9). The two sets of support cylinders (7) are fixed with a support plate (8). A side support frame (16) is provided between the support cylinder (7) and the walk plate (9). One end of the side support frame (16) is fixedly connected to the support cylinder (7), and the other end of the side support frame (16) is fixedly connected to the walk plate (9).

3. The multifunctional pressure monitoring support device based on a rotating bridge support according to claim 1, characterized in that: Mounting holes are provided at the four corners of the surface of the walk plate (9). Screws are fixed at the four corners of the upper surface of the pressure sensor (1). The screws are inserted into the mounting holes and tightened with nuts and fixed by partial welding. Inner support columns (22) are fixed on the inner ring wall and outer ring (28) wall of the walk plate (9). There are several inner support columns (22) and several inner support columns (22) are evenly distributed on the surface of the walk plate (9). The pressure sensor (1) is connected to the pressure measuring instrument through the acquisition line. The pressure measuring instrument is equipped with a linear amplifier (3), an A / D converter (4) and a microprocessor (cpu).

4. The multifunctional pressure monitoring support device based on a rotating bridge support according to claim 1, characterized in that: The inner support plate (13) and the outer support plate (18) are both fixed with a base plate (14) on the side away from the walking plate (9). A guide post (21) is fixed on the slide (11). The guide post (21) and the base plate (14) are slidably connected and a nut is tightened on the guide post (21). The inner support plate (13) and the outer support plate (18) are both provided with an inner sliding groove (23) on the side facing the walking plate (9). The inner support post (22) and the inner sliding groove (23) are slidably connected. A sand discharge cylinder (19) is fixed on the surface of the outer support plate (18) away from the walking plate (9). A cover plate (20) is provided at the opening of the sand discharge cylinder (19). The inner support plate (13), the outer support plate (18) and the two sets of side support plates (12) form an inner cavity (25). The inner cavity (25) is filled with quartz sand (49).

5. A multifunctional pressure monitoring support device based on a rotating bridge support as described in claim 4, characterized in that: Slots (38) are provided at the upper ends of both sides of the inner support plate (13) and the outer support plate (18). The limiting component (15) is located outside the slot (38). An insert plate (47) is fixed on the side surface of the side support plate (12) facing the slide plate (9). The insert plate (47) is set near the upper end of the side support plate (12) and is inserted into the slot (38). Connecting plates (24) are fixed on both sides of the side support plate (12). Guide holes are provided on the surface of the connecting plates (24). The slide rail (11) is fixed with... There is a base block (26), which is located on both sides of the base plate (14). A vertical rod (27) is fixed on the base block (26). The vertical rod (27) is inserted into the guide hole and tightened with a nut. Two sets of hanging ears (17) are fixed on the upper surface of the side support plate (12). Several evenly distributed diagonal braces (10) are set between the side support plate (12) and the slide (11). One end of the diagonal brace (10) is fixedly connected to the side support plate (12), and the other end of the diagonal brace (10) is fixedly connected to the slide (11).

6. A multifunctional pressure monitoring support device based on a rotating bridge support as described in claim 1, characterized in that: A rotating block (30) is rotatably arranged inside the outer ring (28). Several evenly distributed movable balls (46) are arranged on one side surface of the rotating block (30). The movable balls (46) are embedded in the ball groove (40) and roll. An inner handle (33) is fixedly arranged on the other side surface of the rotating block (30). An outer handle (37) is hinged to the end face of the inner handle (33). A storage cavity (32) is opened at the center of the surface of the inner handle (33). An iron block ring (31) is fixed at the outer end of the storage cavity (32).

7. A multifunctional pressure monitoring support device based on a rotating bridge support as described in claim 6, characterized in that: The outer handle (37) is rotatably provided with a rotating shaft (34), and a magnetic ring (36) is fixed on the surface of the outer handle (37). A rubber ring (35) is laid on the surface of the rotating shaft (34). The rotating shaft (34) is inserted into the storage cavity (32), and the magnetic ring (36) attracts the iron block ring (31).

8. A multifunctional pressure monitoring support device based on a rotating bridge support as described in claim 1, characterized in that: The outer periphery of the rotating block (30) is provided with a large groove (41) and a small groove (42). There are several large grooves (41) and small grooves (42). The large grooves (41) and small grooves (42) are staggered on the outer periphery of the rotating block (30). The inner depth of the large groove (41) is greater than the inner depth of the small groove (42). The side of the large groove (41) away from the inner handle (33) is provided with a chamfer. The limiting block (39) can extend out from the large groove (41). The rubber block (29) is completely embedded in the small groove (42).

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