A welding positioning device for cable support frame

Abstract

This invention belongs to the field of welding positioning technology, specifically a welding positioning device for cable support frames. It includes welding equipment and a clamping platform mounted on the welding equipment. The bottom of the clamping platform has a hollow guide platform with an arc-shaped surface and inlets on both sides. A movable platform is slidably mounted on the clamping platform, and a cleaning brush is rotatably mounted on the movable platform. The movable platform has a hollow cavity and an air outlet on the side facing the cleaning brush bristles. An exhaust pipe is fixedly mounted on the clamping platform, and an air path switching component is installed on the exhaust pipe to deliver gas into the movable platform or the exhaust pipe. A control console is fixedly mounted on the top of the movable platform, and a worm gear connected to the cleaning brush is rotatably mounted inside the control console. By removing welding slag from the clamping platform, the problem of welding slag causing the positioning components to not fit tightly with the workpiece and reducing positioning accuracy is solved, thus improving welding quality.

Description

Technical Field

[0001] This invention belongs to the field of welding positioning technology, specifically a welding positioning device for cable support frames. Background Technology

[0002] In fields such as power engineering and building wiring, cable support frames are core components that ensure the safe laying and orderly arrangement of cables. They are typically assembled from metal parts such as steel profiles and plates through welding. The precision of the welding operation directly determines the structural stability of the cable support frame. Currently, most welding positioning devices for cable support frames on the market adopt mechanical positioning structures. These devices achieve precise alignment between each positioning component and the preset positioning surface and positioning holes of the workpiece to be welded, thereby fixing the posture and locking the position of the workpiece during the welding process and avoiding welding deviations caused by workpiece displacement.

[0003] During the welding process of cable support frames, the high-temperature electric arc melts the welding rod, welding wire, and the metal in the area to be welded. After cooling, welding residue is formed. At the same time, under the action of welding impact and high temperature, some metal waste may also be generated, which makes it impossible for the positioning components to fit tightly with the workpiece. This significantly reduces the positioning accuracy of the workpiece and causes deviations in the relative positions between the workpieces to be welded. Consequently, quality problems such as out-of-tolerance dimensions, misaligned holes, and structural deformation of the welded cable support frame are caused.

[0004] Therefore, the present invention provides a welding positioning device for cable support frames. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0006] The technical solution adopted by the present invention to solve its technical problem is: a welding positioning device for cable support frame, comprising welding equipment and a clamping table disposed on the welding equipment; The bottom of the clamping platform is provided with a hollow guide platform, the surface of the guide platform is arc-shaped, and the two sides of the guide platform are provided with inlets; A movable stage is slidably mounted on the clamping platform, and a cleaning brush is rotatably mounted on the movable stage; The moving platform is hollow and has an air outlet on the side facing the cleaning brush bristles. An exhaust pipe is fixedly installed on the clamping platform and an air path switching component is provided on the exhaust pipe to send gas into the moving platform or the interior of the exhaust pipe. A control console is fixedly installed at the top of the mobile platform. A worm gear connected to a cleaning brush is rotatably installed inside the control console. A worm gear meshing with the worm gear is also rotatably installed inside the control console. The worm gear is equipped with a control component for controlling the clockwise or counterclockwise rotation of the worm wheel.

[0007] An air cylinder is fixedly installed on the clamping platform. A piston is slidably installed inside the air cylinder. A first air pipe and a second air pipe are provided on the air cylinder. The other end of the first air pipe is connected to the exhaust pipe, and the other end of the second air pipe extends out of the air cylinder. A one-way valve is provided on both the first air pipe and the second air pipe.

[0008] One end of the piston is fixedly connected to a first reciprocating lead screw, and the outer wall of the first reciprocating lead screw is connected to a transmission rod by a thread. The other end of the transmission rod is fixedly installed with a driven wheel. A drive motor is fixedly installed on the clamping platform, and the output shaft of the drive motor is fixedly connected to a driving wheel that is connected to the driven wheel via a belt.

[0009] A first positioning block and a second positioning block are fixedly installed on both sides of the clamping platform, and a second reciprocating screw is rotatably installed between the first positioning block and the second positioning block. The moving platform and the second reciprocating screw are connected by threads. A sector gear is fixedly mounted on the driven wheel, and a rotating gear that meshes with the sector gear is fixedly mounted on the second reciprocating screw.

[0010] The control assembly includes a control block, a spiral groove, a guide block, a first push rod, and a second push rod; The control block is slidably installed inside the worm gear, the spiral groove is formed on the inner wall of the worm gear, one end of the guide block extends into the spiral groove, and the other end is fixedly connected to the control block; Both the first push rod and the second push rod are slidably installed inside the worm gear. The first push rod is located near the first positioning block of the control block, and the second push rod is located near the second positioning block of the control block.

[0011] The air path switching assembly includes a split pipe, a third air pipe, and a split ball. The split pipe is fixedly installed on the top of the exhaust pipe. One end of the third air pipe extends into the interior of the split pipe, and the other end of the third air pipe is fixedly connected to the moving platform. The split ball is rotatably installed inside the split pipe and has a through hole. The split ball is located below the third air pipe.

[0012] A transmission gear is fixedly installed on the diverting ball, and a toothed plate that meshes with the diverting ball is slidably installed on the top of the exhaust pipe. A first pushing block is slidably installed inside the first positioning block, and one end of the first pushing block is fixedly connected to the toothed plate by a first pull rope. A second pushing block is slidably installed on the second positioning block, and the second pushing block is fixedly connected to the other end of the toothed plate by a second pull rope.

[0013] A baffle plate is slidably mounted on the cleaning brush, and the other end of the baffle plate is elastically mounted inside the cleaning brush via a top pressure rod; A first gear is rotatably mounted on the bottom of the moving platform, a rack that meshes with the first gear is fixedly mounted on the clamping platform, a second gear is fixedly mounted on the bottom of the first gear, a third gear that meshes with the second gear is rotatably mounted inside the cleaning brush, and a cam for pushing the top pressure rod is fixedly mounted on the bottom of the third gear.

[0014] The beneficial effects of this invention are as follows: 1. The welding positioning device for cable support frame described in this invention uses a cleaning brush that slides on the surface of the clamping table to mechanically clean welding residue and metal waste. Combined with the airflow delivered by the exhaust pipe, the cleaning effect can be greatly improved, preventing welding slag from remaining in the positioning area. The arc-shaped guide table can guide the splashed and cleaned welding slag through the feed port for centralized storage. It addresses the problem that welding slag generated during the welding process causes the positioning component and the workpiece to not fit tightly together and reduces positioning accuracy, thus achieving the dual goals of efficient welding slag cleaning and ensuring positioning accuracy.

[0015] 2. The welding positioning device for cable support frame described in this invention uses a drive motor as its power core, which can synchronously drive the air supply mechanism and the cleaning mechanism. Through the meshing of the sector gear and the rotating gear, the sliding speed of the cleaning brush and the air supply efficiency are matched with a differential speed, which ensures stable airflow delivery and avoids the cleaning brush sliding too fast, thus affecting the cleaning quality. At the same time, during the sliding process of the cleaning brush, the gear transmission drives the bundle plate to reciprocate, which can promptly remove the welding slag stuck between the bristles and also help deformed metal bristles to recover, preventing the bristles from deforming and failing due to long-term use, extending the service life of the cleaning brush, and improving the overall operating efficiency and long-term operational reliability of the device. Attached Figure Description

[0016] The invention will now be further described with reference to the accompanying drawings.

[0017] Figure 1 This is a perspective view of the present invention; Figure 2 This is a schematic diagram of the material guide platform in this invention; Figure 3 This is a schematic diagram of the clamping platform in this invention; Figure 4 In this invention Figure 3 Enlarged view of point A in the image; Figure 5 This is a schematic diagram of the installation of the cleaning brush in this invention; Figure 6 In this invention Figure 5 Enlarged view of point B in the image; Figure 7 In this invention Figure 5 Enlarged view of point C in the image; Figure 8 This is a cross-sectional view of the cleaning brush in this invention.

[0018] In the diagram: 1. Welding equipment; 2. Clamping table; 3. Guide table; 4. Feed inlet; 5. Exhaust pipe; 6. First air pipe; 7. Second air pipe; 8. Air cylinder; 9. Diverter pipe; 10. Cam; 11. Drive motor; 12. Driving wheel; 13. Driven wheel; 14. Sector gear; 15. Rotating gear; 16. Piston; 17. Transmission rod; 18. First reciprocating lead screw; 19. First positioning block; 20. Second reciprocating lead screw; 21. Rack; 22. Moving table; 23. Cleaning brush; 24. First push block; 25. First pull rope; 26. Second push block; 27. Second pull rope; 28. Third air pipe; 29. ​​Second positioning block; 30. Control console; 31. Worm gear; 32. Worm; 33. Spiral groove; 34. Guide block; 35. Control block; 36. First push rod; 37. Second push rod; 38. Diverter ball; 39. Transmission gear; 40. Gear plate; 41. Beam plate; 42. First gear; 43. Second gear; 44. Third gear; 45. Top pressure rod. Detailed Implementation

[0019] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0020] A welding positioning device for a cable support frame according to an embodiment of the present invention includes a welding device 1 and a clamping table 2 disposed on the welding device 1; The bottom of the clamping table 2 is provided with a guide table 3 with a cavity. The surface of the guide table 3 is arc-shaped, and the two sides of the guide table 3 are provided with feed ports 4. A movable stage 22 is slidably mounted on the clamping stage 2, and a cleaning brush 23 is rotatably mounted on the movable stage 22; By controlling the sliding of the moving stage 22, the cleaning brush 23 can be driven to clean the clamping stage 2. The cleaning brush 23 is preferably a steel brush, which removes the auxiliary welding slag on the clamping stage 2. At this time, the splashed welding slag and the cleaned welding slag can fall onto the arc-shaped guide stage 3. The arc shape allows the welding slag to be stored through the feed port 4, which will not affect the subsequent use of the welding platform. It can remove the welding slag under high temperature, which solves the problem that welding slag affects the positioning components and the workpiece, resulting in a decrease in the positioning accuracy of the workpiece, and thus causing quality problems such as out-of-tolerance dimensions, misaligned holes, and structural deformation of the welded cable support frame.

[0021] The moving platform 22 is hollow and has an air vent on the side facing the bristles of the cleaning brush 23. An exhaust pipe 5 is fixedly installed on the clamping platform 2. An air path switching component is provided on the exhaust pipe 5 to send gas into the moving platform 22 or the interior of the exhaust pipe 5. The exhaust pipe 5 can blow the splattered welding slag and the welding slag swept off by the cleaning brush 23 into the feed inlet 4 using wind power. The air outlet on the moving table 22 can switch the air path to the inside of the moving table 22 through the air path switching component when the cleaning brush 23 is cleaning the clamping table 2. The cleaning brush 23 can then work with the airflow to improve the cleaning effect on the clamping table 2.

[0022] A control console 30 is fixedly installed on the top of the mobile platform 22. A worm gear 31 connected to the cleaning brush 23 is rotatably installed inside the control console 30. A worm 32 that meshes with the worm gear 31 is rotatably installed inside the control console 30. The worm 32 is equipped with a control component for controlling the clockwise or counterclockwise rotation of the worm wheel 31.

[0023] The rotation of the worm gear 32 can be controlled by rotating the worm wheel 31 and the cleaning brush 23. By controlling the worm wheel 31 to rotate clockwise first, the cleaning brush 23 can be controlled to make its bristles face the clamping table 2.

[0024] An air cylinder 8 is fixedly installed on the clamping platform 2. A piston 16 is slidably installed inside the air cylinder 8. A first air pipe 6 and a second air pipe 7 are provided on the air cylinder 8. The other end of the first air pipe 6 is connected to the exhaust pipe 5, and the other end of the second air pipe 7 extends out of the air cylinder 8. A one-way valve is provided on both the first air pipe 6 and the second air pipe 7.

[0025] The one-way valve installed on the first air pipe 6 allows external gas to enter the interior of the air cylinder 8 through the first air pipe 6, and the one-way valve installed on the second air pipe 7 allows gas inside the air cylinder 8 to enter the interior of the exhaust pipe 5 through the second air pipe 7.

[0026] When the piston 16 slides from right to left inside the air cylinder 8, external gas can be drawn into the air cylinder 8 through the first air pipe 6. Then, by controlling the piston 16 to slide from left to right inside the air cylinder 8, the gas inside the air cylinder 8 can be sent into the exhaust pipe 5 through the second air pipe 7.

[0027] One end of the piston 16 is fixedly connected to a first reciprocating screw 18, and the outer wall of the first reciprocating screw 18 is connected to a transmission rod 17 by a thread. The other end of the transmission rod 17 is fixedly installed with a driven wheel 13. A drive motor 11 is fixedly installed on the clamping table 2, and the output shaft of the drive motor 11 is fixedly connected to a drive wheel 12 that is connected to the driven wheel 13 via a belt.

[0028] The drive motor 11 drives the drive wheel 12 and the driven wheel 13 to rotate, and at the same time drives the transmission rod 17 to rotate. At this time, the first reciprocating screw 18 will drive the piston 16 to slide back and forth inside the air cylinder 8. In conjunction with the first air pipe 6 and the second air pipe 7, the external gas is sent into the interior of the exhaust pipe 5 for subsequent processing.

[0029] A first positioning block 19 and a second positioning block 29 are fixedly installed on both sides of the clamping table 2, and a second reciprocating screw 20 is rotatably installed between the first positioning block 19 and the second positioning block 29. The moving table 22 is connected to the second reciprocating screw 20 by a thread. A sector gear 14 is fixedly mounted on the driven wheel 13, and a rotating gear 15 that meshes with the sector gear 14 is fixedly mounted on the second reciprocating screw 20.

[0030] At the same time, when the drive motor 11 starts, the driven wheel 13 can drive the sector gear 14 to rotate, so that the rotating gear 15 drives the second reciprocating screw 20 to rotate. Under the action of the sector gear 14, it can form a speed difference with the driven wheel 13, which ensures air delivery while avoiding the problem of the cleaning brush 23 sliding too fast and affecting the cleaning quality.

[0031] The control assembly includes a control block 35, a spiral groove 33, a guide block 34, a first push rod 36, and a second push rod 37; The control block 35 is slidably installed inside the worm 32, the spiral groove 33 is formed on the inner wall of the worm 32, one end of the guide block 34 extends into the spiral groove 33, and the other end is fixedly connected to the control block 35. Both the first push rod 36 and the second push rod 37 are slidably installed inside the worm gear 32. The first push rod 36 is located in the control block 35 near the first positioning block 19, and the second push rod 37 is located in the control block 35 near the second positioning block 29.

[0032] When the moving platform 22 slides toward the first positioning block 19 and drives the first push rod 36 to press against the first positioning block 19, the first push rod 36 will push the control block 35 inside the worm gear 32. Under the action of the spiral groove 33 and the guide block 34, the worm gear 32 can drive the worm wheel 31 to rotate, thereby realizing the flipping of the cleaning brush 23. When the moving platform 22 is in contact with the first positioning block 19, the bristles of the cleaning brush 23 will rotate toward the clamping platform 2.

[0033] Conversely, when the moving table 22 slides toward the second positioning block 29, the second push rod 37 contacts and presses against the second positioning block 29. At this time, the second push rod 37 will push the control block 35 to slide toward the first push rod 36, and under the action of the spiral groove 33 and the guide block 34, control the cleaning brush 23 to rotate toward the direction away from the clamping table 2.

[0034] The air path switching assembly includes a diverter pipe 9, a third air pipe 28, and a diverter ball 38. The diverter pipe 9 is fixedly installed on the top of the exhaust pipe 5. One end of the third air pipe 28 extends into the interior of the diverter pipe 9, and the other end of the third air pipe 28 is fixedly connected to the moving platform 22. The diverter ball 38 is rotatably installed inside the diverter pipe 9. A through hole is provided on the diverter ball 38, and the diverter ball 38 is located below the third air pipe 28.

[0035] When the through hole on the diverter ball 38 is in a vertical position, the second air pipe 7 can connect with the inner cavity of the exhaust pipe 5 through the diverter pipe 9. The diameter of the third air pipe 28 is smaller than the diameter of the through hole. Most of the airflow sent from the second air pipe 7 to the diverter pipe 9 will still enter the interior of the exhaust pipe 5 and be discharged. When the through hole on the diverter ball 38 is in a horizontal position, the gas sent from the second air pipe 7 to the diverter pipe 9 can only enter the inner cavity of the moving platform 22 through the third air pipe 28.

[0036] A transmission gear 39 is fixedly installed on the diverting ball 38. A toothed plate 40 that meshes with the diverting ball 38 is slidably installed on the top of the exhaust pipe 5. A first pushing block 24 is slidably installed inside the first positioning block 19. One end of the first pushing block 24 is fixedly connected to the toothed plate 40 through the first pull rope 25. A second pushing block 26 is slidably installed on the second positioning block 29. The second pushing block 26 is fixedly connected to the other end of the toothed plate 40 through the second pull rope 27.

[0037] When the moving platform 22 slides toward the first positioning block 19 and drives the first push rod 36 to press against the first positioning block 19, the first push rod 36 will also push the first push block 24. The toothed plate 40 can be pulled toward the first positioning block 19 by the first pull rope 25. At this time, the diverting ball 38 will rotate the through hole to a horizontal state.

[0038] When the moving platform 22 slides toward the second positioning block 29, the second pusher 37 pushes the second pusher block 26, and the second pull rope 27 pulls the toothed plate 40 toward the second positioning block 29. At this time, the through hole on the diverter ball 38 will become vertical.

[0039] Therefore, when the cleaning brush 23 slides to the position of the second positioning block 29 and is about to slide towards the direction of the first positioning block 19, the brush bristles are facing away from the clamping table 2, and the moving table 22 will not emit air. When it slides to the position of the first positioning block 19 and is about to slide towards the direction of the second positioning block 29, the brush bristles are facing the clamping table 2. During the movement, the air blower is used to further improve the cleaning effect.

[0040] A baffle plate 41 is slidably mounted on the cleaning brush 23, and the other end of the baffle plate 41 is elastically mounted inside the cleaning brush 23 via a top pressure rod 45. A first gear 42 is rotatably mounted on the bottom of the moving platform 22. A rack 21 that meshes with the first gear 42 is fixedly mounted on the clamping platform 2. A second gear 43 is fixedly mounted on the bottom of the first gear 42. A third gear 44 that meshes with the second gear 43 is rotatably mounted inside the cleaning brush 23. A cam 10 for pushing the top pressure rod 45 is fixedly mounted on the bottom of the third gear 44.

[0041] When the moving platform 22 drives the cleaning brush 23 to slide on the clamping platform 2, the first gear 42 will mesh with the rack 21 and drive the second gear 43 to rotate. At the same time, the third gear 44 drives the cam 10 to rotate continuously, which can intermittently push the top pressure rod 45. With the help of the elastic force, the bristle plate 41 slides back and forth on the bristle assembly. Since the brush is preferably made of metal, the bristles are not easy to recover from deformation during the cleaning process. By intermittently moving the bristle plate 41 on the bristle assembly, not only can the welding slag stuck between the bristles be removed, but the bristles can also be helped to recover, thereby improving the subsequent use effect of the bristles.

[0042] The terms "front," "back," "left," "right," "top," and "bottom" all refer to the figures in the accompanying drawings. Figure 1 Based on the perspective of the observer, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0043] In the description of this invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this invention.

[0044] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A welding positioning device for a cable support frame, comprising a welding device (1) and a clamping table (2) disposed on the welding device (1); Its features are: The bottom of the clamping platform (2) is provided with a hollow guide platform (3), the surface of the guide platform (3) is arc-shaped, and the two sides of the guide platform (3) are provided with inlets (4). A movable stage (22) is slidably mounted on the clamping platform (2), and a cleaning brush (23) is rotatably mounted on the movable stage (22). The moving platform (22) is hollow and has an air outlet on the side facing the bristles of the cleaning brush (23). An exhaust pipe (5) is fixedly installed on the clamping platform (2). An air path switching component is provided on the exhaust pipe (5) to send gas into the interior of the moving platform (22) or the exhaust pipe (5). The top of the mobile platform (22) is fixedly mounted with a control console (30), and a worm gear (31) connected to the cleaning brush (23) is rotatably mounted inside the control console (30). A worm (32) meshing with the worm gear (31) is rotatably mounted inside the control console (30). The worm (32) is provided with a control component for controlling the clockwise or counterclockwise rotation of the worm wheel (31); An air cylinder (8) is fixedly installed on the clamping platform (2), and a piston (16) is slidably installed inside the air cylinder (8). One end of the piston (16) is fixedly connected to a first reciprocating screw (18), and the outer wall of the first reciprocating screw (18) is connected to a transmission rod (17) by a thread. The other end of the transmission rod (17) is fixedly installed with a driven wheel (13). A drive motor (11) is fixedly installed on the clamping table (2), and the output shaft of the drive motor (11) is fixedly connected to a drive wheel (12) that is connected to the driven wheel (13) via a belt. The clamping platform (2) is fixedly installed with a first positioning block (19) and a second positioning block (29) on both sides respectively. A second reciprocating screw (20) is rotatably installed between the first positioning block (19) and the second positioning block (29). The moving platform (22) is connected to the second reciprocating screw (20) by a thread. A sector gear (14) is fixedly installed on the driven wheel (13), and a rotating gear (15) that meshes with the sector gear (14) is fixedly installed on the second reciprocating screw (20). The control assembly includes a control block (35), a spiral groove (33), a guide block (34), a first push rod (36), and a second push rod (37); The control block (35) is slidably installed inside the worm (32), the spiral groove (33) is opened on the inner wall of the worm (32), one end of the guide block (34) extends into the spiral groove (33), and the other end is fixedly connected to the control block (35); The first push rod (36) and the second push rod (37) are both slidably installed inside the worm gear (32). The first push rod (36) is located near the first positioning block (19) of the control block (35), and the second push rod (37) is located near the second positioning block (29) of the control block (35).

2. The welding positioning device for a cable support frame according to claim 1, characterized in that: The air cylinder (8) is provided with a first air pipe (6) and a second air pipe (7). The other end of the second air pipe (7) is connected to the exhaust pipe (5). The other end of the first air pipe (6) extends out of the air cylinder (8). Both the first air pipe (6) and the second air pipe (7) are provided with a one-way valve.

3. The welding positioning device for a cable support frame according to claim 1, characterized in that: The air path switching assembly includes a split pipe (9), a third air pipe (28), and a split ball (38). The split pipe (9) is fixedly installed on the top of the exhaust pipe (5). One end of the third air pipe (28) extends into the interior of the split pipe (9), and the other end of the third air pipe (28) is fixedly connected to the moving platform (22). The split ball (38) is rotatably installed inside the split pipe (9). The split ball (38) has a through hole and is located below the third air pipe (28).

4. The welding positioning device for a cable support frame according to claim 3, characterized in that: A transmission gear (39) is fixedly installed on the diverting ball (38). A toothed plate (40) that meshes with the diverting ball (38) is slidably installed on the top of the exhaust pipe (5). A first pushing block (24) is slidably installed inside the first positioning block (19). One end of the first pushing block (24) is fixedly connected to the toothed plate (40) through a first pull rope (25). A second pushing block (26) is slidably installed on the second positioning block (29). The second pushing block (26) is fixedly connected to the other end of the toothed plate (40) through a second pull rope (27).

5. The welding positioning device for a cable support frame according to claim 4, characterized in that: A baffle plate (41) is slidably mounted on the cleaning brush (23), and the other end of the baffle plate (41) is elastically mounted inside the cleaning brush (23) by a top pressure rod (45); The bottom of the moving platform (22) is rotatably mounted with a first gear (42), and the clamping platform (2) is fixedly mounted with a rack (21) meshing with the first gear (42). The bottom of the first gear (42) is fixedly mounted with a second gear (43), and the inside of the cleaning brush (23) is rotatably mounted with a third gear (44) meshing with the second gear (43). The bottom of the third gear (44) is fixedly mounted with a cam (10) for pushing the top pressure rod (45).

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