A highway crack processing device

Abstract

The application provides a highway crack treatment device, which comprises a bottom plate and support columns, the lower surface of the bottom plate is symmetrically fixedly connected with the support columns, the end of the surface of each of the four support columns away from the bottom plate is provided with a vertical groove, the surface of the vertical groove is slidably installed with a supporting device, the lower surface of the bottom plate is symmetrically provided with self-locking universal wheels, the self-locking universal wheels are rotatably installed with the supporting device, the upper surface of the bottom plate is fixedly connected with a box body, the top upper surface of the box body is provided with an inlet, the surface of the inlet is installed with an inlet valve, the top upper surface of the box body is symmetrically fixedly connected with L-shaped plates, when the mixture for repairing cracks is stirred, the mixture can be prevented from being coagulated into blocks, intermittent discharging can be completed, the repaired cracks can be flattened, manual flattening and scraping of the road surface can be avoided, the repairing quality can be ensured, and the repairing quality is improved.

Description

Technical Field

[0001] This invention relates to the field of highway engineering technology, and in particular to a highway crack treatment device. Background Technology

[0002] The literal meaning of a highway is a public road or a road for public transportation. It can be used by various means of transportation such as cars, bicycles, rickshaws, horse-drawn carriages, and pedestrians. With the surge in traffic, highways often develop cracks. If they are not repaired in time, rainwater will corrode all aspects of the highway, affecting the use of the entire road.

[0003] Existing highway crack treatment devices mostly rely on manual smoothing and scraping of the road surface after repair, which is not only time-consuming and labor-intensive, but also results in poor road surface smoothness and low efficiency.

[0004] Therefore, it is necessary to provide a highway crack treatment device to solve the above-mentioned technical problems. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a highway crack treatment device, comprising a base plate and support columns. Support columns are symmetrically fixedly connected to the lower surface of the base plate. Vertical grooves are formed on the surfaces of the four support columns at the ends furthest from the base plate. Supporting devices are slidably mounted on the surfaces of the vertical grooves. Self-locking casters are symmetrically arranged below the base plate, rotatably mounted to the support devices. A housing is fixedly connected to the upper surface of the base plate. A feed inlet is formed on the top surface of the housing, and a feed valve is installed on the surface of the feed inlet. L-shaped plates are symmetrically fixedly connected to the top surface of the housing. A motor base is fixedly connected to the surface of the L-shaped plates. A first motor is fixedly mounted on the surface of the motor base. A rotating column is fixedly connected to the output end of the first motor. A flattening device is fixedly connected to the surface of the rotating column, fixedly mounted to the housing, and rotatably mounted to the base plate. A stirring device is fixedly mounted at the end of the rotating column furthest from the first motor. A heating plate is fixedly mounted on the inner wall of the housing. A through hole is formed on the lower surface of the base plate, and a discharge pipe is fixedly connected below the through hole. The stirring device is installed in conjunction with the discharge pipe.

[0006] Preferably, the support device includes a first spring, a circular block, and a cylinder. The circular block is slidably connected to the surface of the vertical groove. The first spring is fixedly connected to the top of the circular block. The cylinder is fixedly connected to the bottom of the circular block. The cylinder is slidably connected to the support column. The end of the cylinder away from the circular block is rotatably mounted to a self-locking universal wheel.

[0007] Preferably, the first spring is initially in a compressed state.

[0008] Preferably, the stirring device includes a first transmission column, a stirring column, stirring rods, a circular ring, an annular groove, an arc-shaped block, a fixed column, a column groove, a second spring, a lifting block, a lifting column, a horizontal column, an arc-shaped plate, and a conical block. The first transmission column is fixedly connected to the end of the rotating column away from the first motor. The stirring column is slidably mounted on the surface of the first transmission column. The stirring column is fitted with the housing. Multiple stirring rods are symmetrically fixedly connected to the surface of the stirring column. A circular ring is fixedly connected below the motor base. An annular groove is formed on the surface of the circular ring. An arc-shaped block is symmetrically mounted on the surface of the annular groove around its center. A fixed column is fixedly connected to the bottom of the arc-shaped block. A column groove is opened on the surface of the fixed column. A lifting block is slidably connected to the surface of the column groove. A second spring is fixedly connected to the top of the lifting block. A lifting column is fixedly connected to the bottom of the lifting block. The lifting column and the fixed column are slidably installed. A horizontal column is fixedly connected to the end of the lifting column away from the lifting block. Arc-shaped plates are symmetrically fixedly connected to the upper surface of the top of the box. The arc-shaped plates are installed in conjunction with the horizontal columns. One end of each of the two horizontal columns is fixedly connected to the stirring column. A conical block is fixedly connected to the end of the stirring column away from the rotating column. The conical block is installed in conjunction with the feeding pipe.

[0009] Preferably, a limiting groove is formed on the surface of the annular groove, and both arc-shaped blocks are rotatably installed with the limiting groove.

[0010] Preferably, the second spring is initially in a compressed state.

[0011] Preferably, the flattening device includes a strip groove, a pulley, a second transmission column, a positioning block, a rotating block, a U-shaped column, a connecting groove, a protruding column, a connecting column, a mounting base, a rectangular column, a groove, a third spring, a movable block, a movable column, a mounting block, and a pressure roller. Positioning blocks are fixedly connected to the surface of the housing, and there are two positioning blocks. The second transmission column is rotatably mounted inside the two positioning blocks. A pulley is fixedly connected to one end of the surface of the second transmission column and the surface of the rotating column. The two pulleys are driven by a belt. A rotating block is fixedly connected to the end of the second transmission column near the bottom plate. A protruding column is fixedly connected to the lower surface of the rotating block. Strip grooves are symmetrically formed on the upper surface of the bottom plate next to the housing. Two strip-shaped grooves are fitted with U-shaped columns. The surfaces of the U-shaped columns have connecting grooves. One end of the protruding column is fitted with the connecting groove. Connecting columns are symmetrically slidably mounted on the surfaces of the U-shaped columns. Mounting seats are symmetrically fixedly connected to the lower surface of the base plate. The mounting seats and connecting columns are rotatably mounted. Rectangular columns are fixedly connected to the ends of the two connecting columns away from the U-shaped columns. The surfaces of the rectangular columns have grooves. Movable blocks are slidably connected to the surfaces of the grooves. A third spring is fixedly connected above the movable block. A movable column is fixedly connected below the movable block. The movable column is slidably connected to the rectangular column. A mounting block is fixedly connected to the end of the movable column away from the movable block. A pressure roller is rotatably mounted between the two mounting blocks.

[0012] Preferably, a handrail is fixedly connected to one side of the base plate.

[0013] Preferably, the U-shaped column includes a first connecting part and a second connecting part. The first connecting part is slidably connected to the base plate, and the second connecting part is rotatably installed at both ends of the first connecting part. The second connecting part is slidably installed with the connecting column.

[0014] Compared with the prior art, the present invention provides a highway crack treatment device, which has the following beneficial effects:

[0015] This invention, during the mixing process of the crack repair mixture, can prevent internal agglomeration and achieve intermittent feeding, while simultaneously flattening the crack repair area, avoiding the need for manual smoothing and scraping of the road surface, thus ensuring and improving the repair quality. Attached Figure Description

[0016] Figure 1 This is one of the overall structural schematic diagrams of the present invention;

[0017] Figure 2 This is a schematic diagram of the horizontal column structure of the present invention;

[0018] Figure 3 This is the second schematic diagram of the overall structure of the present invention;

[0019] Figure 4 This is the third schematic diagram of the overall structure of the present invention;

[0020] Figure 5 This is a schematic diagram of the movable block and movable column structure of the present invention;

[0021] Figure 6 This is a schematic diagram of the limiting groove and annular groove structure of the present invention;

[0022] Figure 7 This is a schematic diagram of the internal structure of the box of the present invention;

[0023] Figure 8 This is a side view of the feed tube structure of the present invention;

[0024] Figure 9 This is a schematic diagram of the connecting groove structure of the present invention;

[0025] Figure 10 This is a schematic diagram of the second connecting part and the connecting post of the present invention.

[0026] Figure 11 This is a schematic diagram of the structure of the conical block and the feed tube of the present invention.

[0027] In the diagram: 1. Base plate; 2. Support column; 3. Vertical groove; 4. Self-locking caster wheel; 5. Box body; 6. Feed inlet; 7. Feed valve; 8. L-shaped plate; 9. Motor base; 10. First motor; 11. Rotating column; 12. Heating plate; 13. Through hole; 14. Feed pipe; 15. First spring; 16. Circular block; 17. Cylinder; 18. First transmission column; 19. Stirring column; 20. Stirring rod; 21. Ring; 22. Annular groove; 23. Arc-shaped block; 24. Fixed column; 25. Column groove; 26. Second spring; 27. Lifting... 28. Lowering block; 29. ​​Lifting column; 30. Horizontal column; 31. Arc plate; 32. Conical block; 33. Limiting groove; 34. Strip groove; 35. Pulley; 36. Second transmission column; 37. Positioning block; 38. Rotating block; 39. U-shaped column; 40. Connecting groove; 41. Protruding column; 42. Connecting column; 43. Mounting base; 44. Rectangular column; 45. Groove; 46. Third spring; 47. Movable block; 48. Movable column; 49. Mounting block; 50. Pressure roller; 51. Handrail; 52. First connecting part; 53. Second connecting part. Detailed Implementation

[0028] Please see Figures 1 to 11 This invention relates to a highway crack treatment device, comprising a base plate 1 and support columns 2. The support columns 2 are symmetrically fixedly connected to the lower surface of the base plate 1. Vertical grooves 3 are formed at the ends of the four support columns 2 away from the base plate 1. Support devices are slidably mounted on the surfaces of the vertical grooves 3. Self-locking casters 4 are symmetrically arranged below the base plate 1, and are rotatably mounted to the support devices. A housing 5 is fixedly connected to the upper surface of the base plate 1. A feed inlet 6 is formed on the top upper surface of the housing 5, and a feed valve 7 is installed on the surface of the feed inlet 6. L-shaped plates 8 are symmetrically fixedly connected to the top upper surface of the housing 5. A motor base 9 is fixedly connected to the surface of the mold plate 8. A first motor 10 is fixedly installed on the surface of the motor base 9. A rotating column 11 is fixedly connected to the output end of the first motor 10. A flattening device is fixedly connected to the surface of the rotating column 11. The flattening device is fixedly installed to the box body 5 and rotatably installed to the bottom plate 1. A stirring device is fixedly installed at the end of the rotating column 11 away from the first motor 10. A heating plate 12 is fixedly installed on the inner wall of the box body 5. A through hole 13 is opened on the lower surface of the bottom plate 1. A feeding pipe 14 is fixedly connected below the through hole 13. The stirring device is installed in conjunction with the feeding pipe 14.

[0029] The support device includes a first spring 15, a circular block 16, and a cylinder 17. The circular block 16 is slidably connected to the surface of the vertical groove 3. The first spring 15 is fixedly connected to the top of the circular block 16, and the cylinder 17 is fixedly connected to the bottom of the circular block 16. The cylinder 17 is slidably connected to the support column 2. The end of the cylinder 17 away from the circular block 16 is rotatably installed with the self-locking universal wheel 4. The elastic force of the first spring 15 provides cushioning for the whole and ensures the stability of the whole during movement.

[0030] The first spring 15 is initially compressed, ensuring that it has sufficient force to support the whole and provide cushioning.

[0031] The stirring device includes a first transmission column 18, a stirring column 19, a stirring rod 20, a ring 21, an annular groove 22, an arc-shaped block 23, a fixed column 24, a column groove 25, a second spring 26, a lifting block 27, a lifting column 28, a horizontal column 29, an arc-shaped plate 30, and a conical block 31. The first transmission column 18 is fixedly connected to the end of the rotating column 11 away from the first motor 10. The stirring column 19 is slidably mounted on the surface of the first transmission column 18. The stirring column 19 is installed in conjunction with the housing 5. Multiple stirring rods 20 are symmetrically fixedly connected to the surface of the stirring column 19. A ring 21 is fixedly connected below the motor base 9. An annular groove 22 is formed on the surface of the ring 21. An arc-shaped block 23 is symmetrically mounted on the surface of the annular groove 22 around its center. A fixed column 24 is fixedly connected below the arc-shaped block 23. A column groove 25 is formed on the surface of the fixed column 24. A lifting block 27 is slidably connected to the surface of the column groove 25. A second spring 26 is fixedly connected above the lifting block 27. A lifting column 28 is fixedly connected to the bottom of the lifting block 27. The lifting column 28 is slidably installed with the fixed column 24. A horizontal column 29 is fixedly connected to the end of the lifting column 28 away from the lifting block 27. An arc plate 30 is symmetrically fixedly connected to the upper surface of the top of the box 5. The arc plate 30 is installed in conjunction with the horizontal column 29. One end of each of the two horizontal columns 29 is fixedly connected to the stirring column 19. A conical block 31 is fixedly connected to the end of the stirring column 19 away from the rotating column 11. The conical block 31 is installed in conjunction with the discharge pipe 14. The first motor 10 starts, driving the rotating column 11 to rotate, which in turn drives the first transmission column 18 to rotate. The initial state of the second spring 26 is compressed. The reaction force generated by the compression of the second spring 26 acts on the surface of the lifting block 27, so that the horizontal column 29 can be in close contact with the surface of the arc plate 30. The stirring column 19 can also move up and down stably during rotation. The stirring rod 20 rotates with the stirring column 19 to ensure the stirring effect.

[0032] A limiting groove 32 is provided on the surface of the annular groove 22, and both arc-shaped blocks 23 are rotatably installed with the limiting groove 32 to prevent the arc-shaped blocks 23 from separating from the annular groove 22.

[0033] The second spring 26 is initially compressed, ensuring that there is enough force to act on the surface of the lifting block 27, so that the horizontal column 29 is in close contact with the surface of the arc plate 30.

[0034] The flattening device includes a strip groove 33, a pulley 34, a second transmission column 35, a positioning block 36, a rotating block 37, a U-shaped column 38, a connecting groove 39, a protruding column 40, a connecting column 41, a mounting base 42, a rectangular column 43, a groove 44, a third spring 45, a movable block 46, a movable column 47, a mounting block 48, and a pressure roller 49. Positioning blocks 36 are fixedly connected to the surface of the housing 5, and there are two positioning blocks 36. The second transmission column 35 is rotatably mounted inside the two positioning blocks 36. One end of the transmission column 35 and the surface of the rotating column 11 are both fixedly connected to pulleys 34, which are driven by a belt. A rotating block 37 is fixedly connected to the end of the second transmission column 35 near the base plate 1. A protruding post 40 is fixedly connected to the lower surface of the rotating block 37. The upper surface of the base plate 1 has symmetrically formed strip grooves 33 next to the housing 5. U-shaped posts 38 are fitted onto the surfaces of the two strip grooves 33. Connecting grooves 39 are formed on the surfaces of the U-shaped posts 38. The protruding post 40 is connected to the connecting post 39. One end of the groove 39 is fitted with a connecting column 41 that is symmetrically slidably mounted on the surface of the U-shaped column 38. The lower surface of the base plate 1 is symmetrically fixed with a mounting base 42. The mounting base 42 is rotatably mounted with the connecting column 41. The ends of the two connecting columns 41 away from the U-shaped column 38 are fixedly connected with rectangular columns 43. The surface of the rectangular column 43 is provided with a groove 44. The surface of the groove 44 is slidably connected with a movable block 46. The upper part of the movable block 46 is fixedly connected with a third spring 45. The lower part of the movable block 46 is fixedly connected with a movable column 47. The movable column 47 is slidably connected with the rectangular column 43. The end of the movable column 47 away from the movable block 46 is fixedly connected with a mounting block 48. The pressure roller 49 is rotatably mounted between the two mounting blocks 48. The initial state of the third spring 45 is a compressed state, which makes the pressure roller 49 in close contact with the road surface. As the second transmission column 35 rotates, the pressure roller 49 moves back and forth to flatten the road surface. When the U-shaped column 38 moves to one end of the strip groove 33, the pressure roller 49 has separated from the ground.

[0035] A handrail 50 is fixedly connected to one side of the base plate 1 to facilitate overall movement control.

[0036] The U-shaped column 38 includes a first connecting part 51 and a second connecting part 52. The first connecting part 51 is slidably connected to the base plate 1. The second connecting part 52 is rotatably installed at both ends of the first connecting part 51. The second connecting part 52 is slidably installed with the connecting column 41. The second connecting part 51 is inserted into the connecting column 41 to realize stable transmission between the connecting column 41 and the U-shaped column 38.

[0037] Working principle and usage process of this invention:

[0038] A controller can be installed on the surface of the housing 5. The first motor 10, heating plate 12, and feed valve 7 are all connected to the controller via wires. The controller is precisely controlled by a computer or other control terminal. Feeding occurs through the feed port 6, and the material is heated by the heating plate 12. The first motor 10 starts, driving the rotating column 11 to rotate, which in turn drives the first transmission column 18 to rotate. The second spring 26 is initially compressed. The reaction force generated by the compression of the second spring 26 acts on the surface of the lifting block 27, allowing the horizontal column 29 to contact the surface of the arc plate 30. The mixing column 19 is in close contact and can move up and down stably during rotation. The mixing rod 20 rotates with the mixing column 19 to ensure the mixing effect. During the up and down movement of the mixing column 19, the cone block 31 and the feed pipe 14 move relative to each other. The upper and lower ends of the feed pipe 14 have different diameters. When the mixing column 19 moves to the lowest point, the cone block 31 separates from the upper end of the feed pipe 14, and the mixed mixture for repairing cracks flows out from the feed pipe 14. The mixture is fed intermittently to avoid too much flowing out at once.

[0039] As the rotating column 11 rotates, it is driven by the belt and pulley 34. The second transmission column 35 rotates with the rotating column 11, which in turn drives the rotating block 37 to rotate. The rotating block 37 and the second transmission column 35 are eccentrically matched. The protruding column 40 and the connecting groove 39 cooperate to drive the U-shaped column 38 to move back and forth continuously, which in turn drives the connecting column 41 to rotate. With the rotating connection between the connecting column 41 and the mounting base 42 as the rotation center, the third spring 45 is initially in a compressed state, so that the pressure roller 49 is in close contact with the road surface. As the second transmission column 35 rotates, the pressure roller 49 moves back and forth to flatten the road surface. When the U-shaped column 38 moves to one end of the strip groove 33, the pressure roller 49 has separated from the ground.

[0040] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.

Claims

1. A highway crack treatment device, comprising a base plate (1) and support columns (2), wherein the support columns (2) are symmetrically fixedly connected to the lower surface of the base plate (1), characterized in that, Each of the four support columns (2) has a vertical groove (3) at one end away from the base plate (1). A support device is slidably installed on the surface of the vertical groove (3). Self-locking casters (4) are symmetrically arranged below the base plate (1). The self-locking casters (4) are rotatably installed with the support device. A box (5) is fixedly connected to the upper surface of the base plate (1). A feed inlet (6) is opened on the top upper surface of the box (5). A feed valve (7) is installed on the surface of the feed inlet (6). An L-shaped plate (8) is symmetrically fixedly connected to the top upper surface of the box (5). A motor base (9) is fixedly connected to the surface of the L-shaped plate (8). A first motor (10) is fixedly installed on the surface of the box (5). A rotating column (11) is fixedly connected to the output end of the first motor (10). A flattening device is fixedly connected to the surface of the rotating column (11). The flattening device is fixedly installed with the box (5) and rotatably installed with the bottom plate (1). A stirring device is fixedly installed at the end of the rotating column (11) away from the first motor (10). A heating plate (12) is fixedly installed on the inner wall of the box (5). A through hole (13) is opened on the lower surface of the bottom plate (1). A feeding pipe (14) is fixedly connected below the through hole (13). The stirring device is installed in conjunction with the feeding pipe (14). The support device includes a first spring (15), a circular block (16) and a cylinder (17). The circular block (16) is slidably connected to the surface of the vertical groove (3). The first spring (15) is fixedly connected above the circular block (16). The cylinder (17) is fixedly connected below the circular block (16). The cylinder (17) is slidably connected to the support column (2). The end of the cylinder (17) away from the circular block (16) is rotatably installed with a self-locking universal wheel (4). The first spring (15) is initially in a compressed state; The stirring device includes a first transmission column (18), a stirring column (19), a stirring rod (20), a ring (21), an annular groove (22), an arc block (23), a fixed column (24), a column groove (25), a second spring (26), a lifting block (27), a lifting column (28), a horizontal column (29), an arc plate (30), and a conical block (31). The first transmission column (18) is fixedly connected to the end of the rotating column (11) away from the first motor (10). The stirring column (19) is slidably installed on the surface of the first transmission column (18). The stirring column (19) is installed in conjunction with the housing (5). Multiple stirring rods (20) are symmetrically fixedly connected to the surface of the stirring column (19). A ring (21) is fixedly connected below the motor base (9). An annular groove (22) is opened on the surface of the ring (21). An arc block (23) is symmetrically installed on the surface of the annular groove (22) around the center. A fixed column (24) is fixedly connected to the lower part of the arc-shaped block (23). A column groove (25) is opened on the surface of the fixed column (24). A lifting block (27) is slidably connected to the surface of the column groove (25). A second spring (26) is fixedly connected to the upper part of the lifting block (27). A lifting column (28) is fixedly connected to the lower part of the lifting block (27). The lifting column (28) is slidably installed with the fixed column (24). A horizontal column (29) is fixedly connected to the end of the lifting column (28) away from the lifting block (27). An arc-shaped plate (30) is symmetrically fixedly connected to the upper surface of the top of the box (5). The arc-shaped plate (30) is installed in conjunction with the horizontal column (29). One end of each of the two horizontal columns (29) is fixedly connected to the stirring column (19). A conical block (31) is fixedly connected to the end of the stirring column (19) away from the rotating column (11). The conical block (31) is installed in conjunction with the feeding pipe (14). The flattening device includes a strip groove (33), a pulley (34), a second transmission column (35), a positioning block (36), a rotating block (37), a U-shaped column (38), a connecting groove (39), a protruding column (40), a connecting column (41), a mounting base (42), a rectangular column (43), a groove (44), a third spring (45), a movable block (46), a movable column (47), a mounting block (48), and a pressure roller (49). The surface of the housing (5) is fixedly connected with the positioning block (36), and there are two positioning blocks (36). A second transmission column (35) is rotatably mounted inside the positioning block (36). A pulley (34) is fixedly connected to one end of the surface of the second transmission column (35) and the surface of the rotating column (11). The two pulleys (34) are driven by a belt. A rotating block (37) is fixedly connected to one end of the second transmission column (35) near the bottom plate (1). A protruding column (40) is fixedly connected to the lower surface of the rotating block (37). A strip groove (33) is symmetrically opened on the upper surface of the bottom plate (1) next to the housing (5). A U-shaped column (38) is fitted onto the surface of the strip groove (33). A connecting groove (39) is provided on the surface of the U-shaped column (38). One end of the protruding column (40) is fitted into the connecting groove (39). Connecting columns (41) are symmetrically slidably mounted on the surface of the U-shaped column (38). Mounting seats (42) are symmetrically fixedly connected to the lower surface of the base plate (1). The mounting seats (42) are rotatably mounted to the connecting columns (41). Rectangular columns (4) are fixedly connected to the ends of the two connecting columns (41) away from the U-shaped column (38). 3) A groove (44) is provided on the surface of the rectangular column (43). A movable block (46) is slidably connected to the surface of the groove (44). A third spring (45) is fixedly connected above the movable block (46). A movable column (47) is fixedly connected below the movable block (46). The movable column (47) is slidably connected to the rectangular column (43). An installation block (48) is fixedly connected to one end of the movable column (47) away from the movable block (46). A pressure roller (49) is rotatably installed between the two installation blocks (48).

2. The highway crack treatment device according to claim 1, characterized in that: The surface of the annular groove (22) is provided with a limiting groove (32), and both of the arc-shaped blocks (23) are rotatably installed with the limiting groove (32).

3. The highway crack treatment device according to claim 1, characterized in that: The second spring (26) is initially in a compressed state.

4. A highway crack treatment device according to claim 1, characterized in that: A handrail (50) is fixedly connected to one side of the base plate (1).

5. A highway crack treatment device according to claim 1, characterized in that: The U-shaped column (38) includes a first connecting part (51) and a second connecting part (52). The first connecting part (51) is slidably connected to the base plate (1). The second connecting part (52) is rotatably installed at both ends of the first connecting part (51). The second connecting part (52) is slidably installed with the connecting column (41).

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