An edge grinding machine for ceramic tile production

Abstract

The application relates to the technical field of edge grinding machines, in particular to an edge grinding machine for ceramic tile production, which comprises a chassis, the upper end of the chassis is embedded with a conveying belt, the rear edge of the upper end of the chassis is provided with a grinding mechanism, the upper surface of the chassis is respectively provided with a wheel row and a guide rail on the two sides of the rear edge, the front edge of the upper surface of the chassis is provided with a baffle through an extension mechanism, one side of the inner side of the guide rail is fixedly embedded with a fixed plate, the other side of the inner side of the guide rail is slidably embedded with a moving plate, the front end between the fixed plate and the moving plate is provided with a locking mechanism, two supporting rods are movably inserted between the fixed plate and the moving plate, the lower ends of the two supporting rods are respectively rotatably embedded with limit wheels, the edge grinding machine is provided with a multidirectional structure, the long-strip-shaped ceramic tile can be stably conveyed and accurately positioned, the deviation of the long-strip-shaped ceramic tile can be effectively prevented, the grinding debris can be automatically cleaned, the clearance, the jamming and the scratching can be avoided, and the edge grinding precision and the processing stability can be greatly improved.

Description

Technical Field

[0001] This invention relates to the field of edge grinding machine technology, and more particularly to an edge grinding machine for ceramic tile production. Background Technology

[0002] In the process of tile production and processing, edge grinding is one of the key processes. Its core purpose is to grind and shape the edges of the tiles. However, existing tile edge grinding machines have technical defects. Especially when the length of one side of the tile is relatively long, during the conveyor belt transportation process, the side that has been ground by the grinding wheel is prone to conveying skew due to uneven force and insecure positioning. This results in deviations in the tile edge grinding dimensions and uneven grinding of the edges and corners, which seriously affects the quality of edge grinding processing.

[0003] After the edges of the tiles are rounded and polished, their edges change from a right-angled structure to an arc-shaped curved surface. Existing limiting mechanisms, mainly based on wheel rows and straight plates, are difficult to stably adapt to the arc-shaped rounded edges. Wheel rows are mostly arranged in straight lines and have point-contact limiting, resulting in a small contact area with the arc-shaped surface and poor guiding effect, making them prone to slippage and deviation. Customized wheel rows adapted to the arc-shaped surface have poor applicability and are inconvenient to change frequently. When rigid limiting components such as straight plates directly press against the arc-shaped edge, the force is concentrated and the contact method is mismatched, which can easily cause squeezing, scratching, chipping, or surface scratches to the already formed rounded edges, directly damaging the edge forming quality and increasing the defect rate.

[0004] Another problem is that when the grinding wheel rounds the edge of the tile, it will inevitably produce a lot of tile debris. This debris is easy to adhere to and accumulate on the already formed rounded edge surface, becoming a major hidden danger affecting the stability of the limiting part. The accumulation of debris will create irregular gaps between the limiting part and the rounded edge. The accumulated debris will increase the frictional resistance between the limiting part and the tile, which may not only cause the tile to jam, but may also cause the debris to scrape the rounded edge surface under the action of friction, resulting in edge damage and scratches. Therefore, a grinding machine for tile production is proposed. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of the prior art by proposing an edge grinding machine for ceramic tile production.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a grinding machine for ceramic tile production, comprising a base frame, a conveyor belt embedded in the upper end of the base frame, a grinding mechanism provided at the rear of the upper end of the base frame, wheel rows and guide rails respectively installed on both sides of the rear of the upper surface of the base frame, a baffle installed at the front of the upper surface of the base frame via a telescopic mechanism, a fixed plate fixedly embedded in one side of the inner side of the guide rail, a movable plate slidably embedded in the other side of the inner side of the guide rail, a locking mechanism provided at the front end between the fixed plate and the movable plate, two support rods movably inserted between the fixed plate and the movable plate, limit wheels respectively rotatably embedded in the lower ends of the two support rods, a connecting rod connected to the side of the support rods near the grinding mechanism via an elastic mechanism, a soft plate fixedly connected to the lower ends of the two connecting rods, and an elastic wire fixedly connected to the side of the two connecting rods that are close to each other, the elastic wire being spiral in shape and pressing against the upper surface of the soft plate;

[0007] The elastic mechanism includes a sliding plate fixedly connected to the upper end of the connecting rod, a fixed seat fixedly connected to the outer surface of the support rod, insert plates fixedly connected to both sides of the lower surface of the fixed seat, the insert plates slidingly penetrating the upper surface of the sliding plate, a T-shaped column fixedly connected to the upper surface of the sliding plate, a fixed cylinder slidably sleeved on the upper end of the T-shaped column, the upper end of the fixed cylinder fixedly connected to the lower surface of the fixed seat, and a compression spring provided inside the fixed cylinder, the compression spring being located on the upper end face of the T-shaped column;

[0008] As the tile is conveyed to one side, the rounded edge formed by the grinding mechanism is guided and limited by two limiting wheels. Under the pressure of the elastic wire, the soft board adheres to the surface of the rounded edge.

[0009] Preferably, the polishing mechanism includes a motor fixedly installed at the rear of the upper surface of the base frame, a polishing wheel fixedly installed at the output end of the motor, and water spray heads fixedly installed on the upper surface of the base frame and on both sides near the polishing wheel.

[0010] Preferably, the telescopic mechanism includes a telescopic cylinder and a guide cylinder fixedly installed on the front plate of the upper surface of the base frame. A guide rod is slidably inserted into the rear end of the guide cylinder, and the rear end of the guide rod and the telescopic end of the telescopic cylinder are both fixedly connected to the front surface of the baffle.

[0011] Preferably, the locking mechanism includes a threaded post fixedly connected to the front end of one side surface of the fixed plate, a through hole is provided through the front end of one side surface of the movable plate, the threaded post slides through the inner side of the through hole, and a locking nut is threadedly fitted at the end of the threaded post.

[0012] Preferably, sliders are fixedly connected to the rear ends of the upper and lower surfaces of the movable plate, the sliders are slidably embedded in the inner side of the guide rail, the rear end of the guide rail is fixedly connected to a mounting base, and the lower end of the mounting base is fixedly connected to the upper surface of the base frame.

[0013] Preferably, the central shaft of the limiting wheel is fixedly fitted with an axle, the two ends of the axle are respectively rotatably connected to the inner side of the support rod, and the upper end of the support rod is fixedly connected with a contact ball.

[0014] Preferably, an embedded column is fixedly provided on the outer surface of the support rod, and friction plates are fixedly connected to the two end faces of the embedded column respectively. Two sliding grooves are respectively opened on the side of the fixed plate that is close to the moving plate. The two ends of the embedded column are slidably embedded into the inner side of the sliding groove, and a reinforcing plate is fixedly connected to the upper surface of the moving plate.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] This invention forms a multi-directional limiting structure with limiting wheels and baffles, which can stably guide and position long strip tiles, effectively preventing tiles from shifting or tilting during transportation and grinding, and significantly improving the dimensional accuracy and processing consistency of the grinding edge.

[0017] This invention uses a limiting wheel and an arc-shaped rounded edge grinding rolling action to replace the traditional rigid straight plate pressing and point contact wheel row. This not only ensures the compatibility with the arc-shaped curved surface, but also greatly reduces the risk of squeezing, scratching and chipping of the already formed rounded edge grinding, thereby improving the finished product qualification rate.

[0018] This invention utilizes an elastic pressing structure between a flexible board and elastic wires to allow the flexible board to adaptively conform to the rounded corner and ground edge contour, ensuring uniform contact and tight fit, eliminating limiting gaps, and further improving the stability and positioning accuracy during the ceramic tile conveying process.

[0019] The flexible board of this invention can clean and remove the tile debris generated during grinding in a timely manner when continuously bonding with rounded corners and grinding edges. This avoids bonding failure, transmission jamming and scratch damage caused by debris accumulation. It structurally solves the technical problem of debris affecting the limiting accuracy and grinding quality. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of an edge grinding machine for ceramic tile production according to the present invention;

[0021] Figure 2 This is a schematic diagram from another perspective of an edge grinding machine for ceramic tile production according to the present invention;

[0022] Figure 3 This is a cross-sectional view of the guide rail of an edge grinding machine for ceramic tile production according to the present invention;

[0023] Figure 4 This invention relates to an edge grinding machine for ceramic tile production. Figure 3 Enlarged view of point A in the middle;

[0024] Figure 5 This is a schematic diagram of the fixing plate of an edge grinding machine for ceramic tile production according to the present invention;

[0025] Figure 6 This is a schematic diagram of the moving plate of an edge grinding machine for ceramic tile production according to the present invention;

[0026] Figure 7 This is a schematic diagram of the support rod of an edge grinding machine for ceramic tile production according to the present invention;

[0027] Figure 8 This invention relates to an edge grinding machine for ceramic tile production. Figure 7 Enlarged view at point B in the middle;

[0028] Figure 9 This is a schematic diagram of the processing of an edge grinding machine for ceramic tile production according to the present invention;

[0029] Figure 10 This invention relates to an edge grinding machine for ceramic tile production. Figure 9 Enlarged view of point C in the middle.

[0030] The components include: 1. Base frame; 2. Conveyor belt; 3. Mounting base; 4. Fixed plate; 5. Moving plate; 6. Slide groove; 7. Guide rail; 8. Slider; 9. Reinforcing plate; 10. Threaded column; 11. Through hole; 12. Locking nut; 13. Support rod; 15. Embedded column; 16. Friction plate; 17. Contact ball; 18. Limit wheel; 19. Wheel axle; 20. Soft plate; 21. Elastic wire; 22. Connecting rod; 23. Sliding plate; 24. Fixed base; 25. Insert plate; 26. Fixed cylinder; 27. T-shaped column; 28. Compression spring; 29. ​​Motor; 30. Grinding wheel; 31. Spray head; 32. Baffle; 33. Telescopic cylinder; 34. Guide cylinder; 35. Guide rod; 36. Wheel row; 37. Tile; 38. Rounded corner edge. Detailed Implementation

[0031] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0032] like Figures 1-10The illustrated edge grinding machine for tile production includes a base frame 1. A conveyor belt 2 is embedded in the upper end of the base frame 1. A grinding mechanism is located at the rear of the upper end of the base frame 1. Wheel rows 36 and guide rails 7 are respectively installed on both sides of the rear of the upper surface of the base frame 1. A baffle 32 is installed at the front of the upper surface of the base frame 1 via a telescopic mechanism. A fixed plate 4 is fixedly embedded in one side of the inner side of the guide rail 7, and a movable plate 5 is slidably embedded in the other side of the inner side of the guide rail 7. A locking mechanism is provided at the front end between the fixed plate 4 and the movable plate 5. Two support rods 13 are movably inserted between the fixed plate 4 and the movable plate 5. Limit wheels 18 are rotatably embedded in the lower ends of the two support rods 13. A connecting rod 22 is connected to the side of the support rods 13 near the grinding mechanism via an elastic mechanism. The lower ends of the connecting rods 22 are fixedly connected to a flexible plate 20. An elastic wire 21 is fixedly connected to the side of the two connecting rods 22 that are close to each other. The elastic wire 21 is spiral in shape and is pressed on the upper surface of the flexible plate 20. The elastic wire 21 is made of stainless steel spring wire or high elastic alloy wire and has a spiral bending structure, which has good elastic deformation and recovery ability. The flexible plate 20 is made of flexible wear-resistant rubber or polyurethane elastic material. It is soft and has a certain toughness and wear resistance. It can adapt to deformation when it is attached to the surface of the tile 37. It can fit tightly to the arc-shaped surface of the rounded corner edge 38 of the tile 37 without causing rigid compression, scratching or damage to the edge of the tile 37.

[0033] like Figure 7 , Figure 8 As shown, the elastic mechanism includes a sliding plate 23 fixedly connected to the upper end of the connecting rod 22, a fixed seat 24 fixedly connected to the outer surface of the support rod 13, and insert plates 25 fixedly connected to both sides of the lower surface of the fixed seat 24. The insert plates 25 slide through the upper surface of the sliding plate 23 to form a stable vertical guide structure, effectively preventing the sliding plate 23 from swaying during movement. A T-shaped column 27 is fixedly connected to the upper surface of the sliding plate 23. A fixed cylinder 26 is slidably sleeved on the upper end of the T-shaped column 27. The upper end of the fixed cylinder 26 is fixedly connected to the lower surface of the fixed seat 24. A compression spring 28 is provided inside the fixed cylinder 26. The compression spring 28 is located on the upper end face of the T-shaped column 27, so that the sliding plate 23, the connecting rod 22 and the soft plate 20 always have a downward pressing tendency, ensuring that the soft plate 20 and the rounded corner edge 38 of the ceramic tile 37 are flexibly bonded.

[0034] As the tile 37 is being conveyed to one side, the rounded edge 38 formed by the grinding mechanism is guided and limited by two limiting wheels 18. Under the pressure of the elastic wire 21, the soft board 20 is attached to the surface of the rounded edge 38.

[0035] like Figure 2As shown, the grinding mechanism includes a motor 29 fixedly mounted on the rear side of the upper surface of the base frame 1. A grinding wheel 30 is fixedly mounted on the output end of the motor 29. Water spray heads 31 are fixedly mounted on both sides of the upper surface of the base frame 1, close to the grinding wheel 30. The two water spray heads 31 adopt an adjustable directional structure, and the water outlet angle is precisely aligned with the grinding contact area between the grinding wheel 30 and the tile 37. During operation, continuous spraying forms a high-pressure water curtain, which can quickly remove grinding heat, prevent the grinding wheel 30 from burning and the edge of the tile 37 from cracking, and also wash away grinding debris in time, greatly reducing the residue and accumulation of debris on the surface of the rounded corner grinding edge 38. The grinding wheel 30 adopts a grinding wheel structure with an outer arc curved surface and a diamond abrasive layer on the wheel surface, which can perform continuous and stable arc surface grinding on the edge of the tile 37 to form a smooth transition rounded corner grinding edge 38.

[0036] like Figure 2 As shown, the telescopic mechanism includes a telescopic cylinder 33 and a guide cylinder 34 fixedly mounted on the front plate of the upper surface of the base frame 1. A guide rod 35 is slidably inserted into the rear end of the guide cylinder 34. The rear end of the guide rod 35 and the telescopic end of the telescopic cylinder 33 are both fixedly connected to the front surface of the baffle 32. The guide rod 35 and the guide cylinder 34 are fitted with a clearance fit and are provided with a wear-resistant bushing to ensure that the reciprocating motion is free from jamming, guide the front and rear displacement of the baffle 32, realize the rapid positioning and limiting of ceramic tiles 37 of different specifications, and improve adaptability and adjustment efficiency.

[0037] like Figure 3 , Figure 5 , Figure 6 As shown, the locking mechanism includes a threaded post 10 fixedly connected to the front end of one side surface of the fixed plate 4. A through hole 11 is provided through the front end of one side surface of the movable plate 5. The threaded post 10 slides through the inside of the through hole 11, and a locking nut 12 is threaded onto the end of the threaded post 10. By rotating the locking nut 12, the surface of the movable plate 5 can be quickly pressed or moved away.

[0038] like Figure 2 , Figure 3 , Figure 6 As shown, sliders 8 are fixedly connected to the rear ends of the upper and lower surfaces of the movable plate 5, respectively. The sliders 8 slide into the inner side of the guide rail 7. The rear end of the guide rail 7 is fixedly connected to the mounting base 3, and the lower end of the mounting base 3 is fixedly connected to the upper surface of the base frame 1. The sliders 8 and the guide rail 7 form an anti-detachment guiding structure. The mating surfaces are inlaid with a wear-resistant self-lubricating layer, which can effectively reduce the gap error caused by reciprocating sliding wear and grinding vibration, and ensure the parallelism and positioning accuracy when sliding linearly along the guide rail 7, providing stable support for the limit adjustment of different sized ceramic tiles 37.

[0039] like Figure 7As shown, a wheel axle 19 is fixedly mounted on the central axis of the limiting wheel 18. The two ends of the wheel axle 19 are rotatably connected to the inner side of the support rod 13. The limiting wheel 18 rotates around the wheel axle 19. A contact ball 17 is fixedly connected to the upper end of the support rod 13. The contact ball 17 is convenient for the user to hold and move the support rod 13.

[0040] like Figure 3 , Figure 6 As shown, an embedded column 15 is fixedly installed on the outer surface of the support rod 13. Friction plates 16 are fixedly connected to both end faces of the embedded column 15. Two sliding grooves 6 are respectively opened on the side of the fixed plate 4 that is close to the moving plate 5. The two ends of the embedded column 15 are slidably embedded into the inner side of the sliding grooves 6. A reinforcing plate 9 is fixedly connected to the upper surface of the moving plate 5. The reinforcing plate 9 is made of high-strength wear-resistant steel plate and is used to press against the outer wall of the support rod 13. The surface pressing achieves auxiliary positioning of the support rod 13, effectively preventing the support rod 13 from loosening or deflecting under grinding vibration, and further improving the overall stability of the limiting mechanism.

[0041] During processing, the surface of the tile 37 moves toward the grinding wheel 30 via the conveyor belt 2. Guided by the baffle 32 and the wheel row 36, the motor 29 drives the grinding wheel 30 to grind, forming a rounded edge 38 on the edge of the tile 37. On the other side, the surface of the rounded edge 38 is pressed by the limiting wheel 18, and the baffle 32 is used for limiting.

[0042] In the specific operation, the operator first loosens the locking nut 12 to release the locking fixation of the support rod 13, then lifts the two support rods 13 upwards to reserve passage space for the conveying of the tile 37. After the tile 37 is slowly conveyed past this position along the conveyor belt 2, the angle of the support rod 13 is adjusted, and then it is pressed downwards so that the two limit wheels 18 are precisely attached and pressed against the rounded edge 38 surface of the tile 37. Finally, the locking nut 12 is tightened, the moving plate 5 moves closer to the fixed plate 4, the inner wall of the slide 6 presses against the end face of the friction plate 16, and the reinforcing plate 9 presses against the surface of the support rod 13 to ensure the stability of the support rod 13, thus completing the positioning and fixing of the locking mechanism. At this time, if Figure 9 , Figure 10 As shown, the two limiting wheels 18 form a lateral blocking limit on the rounded edge 38 of the tile 37, which, together with the baffle 32, limits the front end of the tile 37, thus constructing a multi-directional limiting and fixing scheme. This effectively ensures the posture stability of the tile 37 during the conveying process and avoids problems such as conveying offset and skewing caused by the long length of one side of the tile 37, thus ensuring the accuracy of subsequent edge grinding processing.

[0043] During the aforementioned limiting process, when the support rod 13 is pressed downwards, the connecting rod 22, which is connected to it via an elastic mechanism, moves downwards synchronously, causing the flexible plate 20 to simultaneously adhere to and press against the surface of the rounded edge 38 of the ceramic tile 37. Specifically, when the lower end of the connecting rod 22 is close to the surface of the rounded edge 38 during downward pressure, the sliding plate 23 moves upwards relative to the support rod 13, and the T-shaped column 27 compresses the spring 28, ensuring that the connecting rod 22, in conjunction with the flexible plate 20, presses against the surface of the rounded edge 38. When the support rod 13 is adjusted in angle or moved in position, the connecting rod 22 is displaced accordingly, thereby creating a pulling effect on the flexible plate 20, causing the flexible plate 20 to undergo adaptive deformation to match the contour of the rounded edge 38 and the adjusted posture of the support rod 13. Meanwhile, the spiral-shaped elastic filament 21 has excellent elastic deformation capability. It is always pressed against the upper surface of the soft plate 20, which can apply a uniform preload to the soft plate 20. This effectively compensates for the possible gaps in the fit during the stretching and deformation of the soft plate 20, ensuring that the soft plate 20 is tightly fitted to the surface of the rounded edge 38 throughout the process. This allows for timely removal of debris from the surface of the rounded edge 38, preventing subsequent contact of the limiting wheel 18 with debris and avoiding problems such as fit failure, transmission jamming, and scratch damage caused by debris accumulation. This structurally solves the technical problem of debris affecting the limiting accuracy and edge grinding quality.

[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 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 claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. An edge grinding machine for ceramic tile production, comprising a base frame (1), characterized in that: A conveyor belt (2) is embedded in the upper end of the base frame (1). A grinding mechanism is provided at the rear of the upper end of the base frame (1). Wheel rows (36) and guide rails (7) are respectively installed on the rear sides of the upper surface of the base frame (1). A baffle (32) is installed at the front of the upper surface of the base frame (1) through a telescopic mechanism. A fixed plate (4) is fixedly embedded in one side of the inner side of the guide rail (7). A movable plate (5) is slidably embedded in the other side of the inner side of the guide rail (7). A locking mechanism is provided at the front end between the fixed plate (4) and the movable plate (5). Two support rods (13) are movably inserted between the moving plate (5) and the lower end of the two support rods (13) are respectively fitted with limit wheels (18). The side of the support rod (13) near the grinding mechanism is connected to a connecting rod (22) through an elastic mechanism. The lower ends of the two connecting rods (22) are fixedly connected to a soft plate (20). The side of the two connecting rods (22) that are close to each other is fixedly connected to an elastic wire (21). The elastic wire (21) is spiral in shape and presses on the upper surface of the soft plate (20). The elastic mechanism includes a sliding plate (23) fixedly connected to the upper end of the connecting rod (22), a fixed seat (24) fixedly connected to the outer surface of the support rod (13), and insert plates (25) fixedly connected to both sides of the lower surface of the fixed seat (24). The insert plates (25) slide through the upper surface of the sliding plate (23). A T-shaped column (27) is fixedly connected to the upper surface of the sliding plate (23). A fixed cylinder (26) is slidably sleeved on the upper end of the T-shaped column (27). The upper end of the fixed cylinder (26) is fixedly connected to the lower surface of the fixed seat (24). A compression spring (28) is provided inside the fixed cylinder (26). The compression spring (28) is located on the upper end face of the T-shaped column (27). The ceramic tile (37) is conveyed to one side, and the rounded edge (38) formed by the grinding mechanism is guided and limited by two limiting wheels (18). Under the pressure of the elastic wire (21), the soft board (20) is attached to the surface of the rounded edge (38). The telescopic mechanism includes a telescopic cylinder (33) and a guide cylinder (34) fixedly installed on the front plate of the upper surface of the base frame (1). A guide rod (35) is slidably inserted into the rear end of the guide cylinder (34). The rear end of the guide rod (35) and the telescopic end of the telescopic cylinder (33) are both fixedly connected to the front surface of the baffle (32). The locking mechanism includes a threaded post (10) fixedly connected to the front end of one side surface of the fixed plate (4), and a through hole (11) is provided through the front end of one side surface of the movable plate (5). The threaded post (10) slides through the inside of the through hole (11), and a locking nut (12) is threaded onto the end of the threaded post (10). An embedded column (15) is fixedly provided on the outer surface of the support rod (13). Friction plates (16) are fixedly connected to the two end faces of the embedded column (15). Two sliding grooves (6) are respectively opened on the side of the fixed plate (4) that is close to the moving plate (5). The two ends of the embedded column (15) are slidably embedded into the inner side of the sliding groove (6). A reinforcing plate (9) is fixedly connected to the upper surface of the moving plate (5).

2. The edge grinding machine for ceramic tile production according to claim 1, characterized in that: The grinding mechanism includes a motor (29) fixedly installed on the rear side of the upper surface of the base frame (1), a grinding wheel (30) fixedly installed at the output end of the motor (29), and water spray heads (31) fixedly installed on the upper surface of the base frame (1) and on both sides near the grinding wheel (30).

3. The edge grinding machine for ceramic tile production according to claim 1, characterized in that: The upper and lower surfaces of the movable plate (5) are respectively fixedly connected to sliders (8), which slide into the inner side of the guide rail (7). The rear end of the guide rail (7) is fixedly connected to a mounting base (3), and the lower end of the mounting base (3) is fixedly connected to the upper surface of the base frame (1).

4. The edge grinding machine for ceramic tile production according to claim 1, characterized in that: The central shaft of the limiting wheel (18) is fixedly fitted with a wheel axle (19), and the two ends of the wheel axle (19) are respectively rotatably connected to the inner side of the support rod (13). The upper end of the support rod (13) is fixedly connected with a contact ball (17).

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