Automatic wire drawing machine

Abstract

The utility model relates to the technical field of plate surface wire drawing, in particular to an automatic wire drawing machine which comprises a machine frame, four supporting plates, two brush rollers, two adjusting assemblies, a lifting assembly and a conveying belt. A rotating shaft is rotationally connected into the supporting plates, a sleeve is fixedly connected to one end of the rotating shaft, positioning shafts are fixedly connected to the centers of the two ends of the brush roller and inserted into the sleeve, the four supporting plates are divided into a group A and a group B, each group comprises two supporting plates, the two supporting plates of the group A are directly welded and fixed to one side in the rack, and the two supporting plates of the group B are directly welded and fixed to the other side in the rack. And the supporting plate of the group B is connected between the two limiting plates of the adjusting assembly in a sliding manner. The device has the advantages that when the brush roller is seriously abraded and needs to be replaced, the lead screw is rotated through the rotating handle to drive the supporting plate of the group B to be far away from the supporting plate of the group A, so that the sleeve slides out of the surface of the positioning shaft at the end of the brush roller, the brush roller can be detached, a new brush roller can be installed through reverse operation, and the purpose of conveniently replacing the brush roller is achieved.

Description

Technical Field

[0001] This utility model relates to the field of sheet metal surface wire drawing technology, and in particular to an automatic wire drawing machine. Background Technology

[0002] Brushing refers to a surface treatment method that creates lines on the surface of a workpiece through grinding, achieving a decorative effect. Because brushing can bring out the texture of metal materials, it has gained increasing popularity and wider application.

[0003] Common wire drawing machines include belt wire drawing machines and brush roller wire drawing machines. Brush roller wire drawing machines work by driving a brush roller to rotate at high speed. When the sheet metal workpiece passes under the brush roller, the steel wires on the surface of the brush roller rub against the surface of the sheet metal workpiece, thereby achieving the purpose of wire drawing. However, the brush roller is a consumable part, and the steel wires on its surface will gradually wear down during the wire drawing process. Therefore, when the steel wires wear down to a certain extent, the brush roller needs to be replaced.

[0004] However, the brush rollers of existing brush roller drawing machines are generally fixed to the frame at both ends by two bearing seats, and one end of the brush roller also needs to be equipped with a transmission structure connected to the motor. Therefore, it is inconvenient to disassemble and assemble the brush roller when replacing it. Utility Model Content

[0005] The purpose of this utility model is to at least solve one of the technical defects described in the background art.

[0006] Therefore, one objective of this utility model is to provide an automatic wire drawing machine, which aims to solve the problem of inconvenient disassembly and assembly of brush rollers in existing brush roller wire drawing machines.

[0007] To achieve the above objectives, one embodiment of the present invention provides an automatic wire drawing machine, including a frame, four support plates, two brush rollers, two adjusting components, a lifting component, and a conveyor belt;

[0008] The support plate is rotatably connected to a rotating shaft, and a sleeve is fixedly connected to one end of the rotating shaft. A positioning shaft is fixedly connected to the center of both ends of the brush roller, and the positioning shaft is inserted into the inside of the sleeve.

[0009] The four support plates are divided into two groups, A and B. Each group includes two support plates. The two support plates in group A are directly welded and fixed to one side of the frame. One end of the rotating shaft in the support plate of group A is keyed to pulley one. Two motors are fixedly installed at the bottom of the frame. The output shaft of the motor is keyed to pulley two. Pulley two and pulley one are connected by belt drive.

[0010] The adjustment assembly includes two limiting plates and a bearing seat. The two limiting plates and the bearing seat are fixedly connected to one side of the frame. The support plate of group B is slidably connected between the two limiting plates. A lead screw is rotatably connected inside the bearing seat. The lead screw is threadedly connected inside the support plate of group B, and a handle is fixedly connected to one end of the lead screw.

[0011] The frame is equipped with a lifting assembly, and a conveyor belt is installed above the lifting assembly.

[0012] The beneficial effect is that when the brush roller is severely worn and needs to be replaced, the screw is rotated by the handle, which drives the support plate of group B away from the support plate of group A. As a result, the sleeve slides out from the positioning shaft surface at the end of the brush roller, and the brush roller can be removed. The new brush roller can be installed by reversing the operation, thus achieving the purpose of facilitating the replacement of the brush roller.

[0013] In a preferred embodiment, the frames on both sides of the conveyor belt are provided with insertion holes corresponding to the positioning shaft, and a support arm is inserted into the insertion hole, with an arc-shaped groove on the top of the support arm.

[0014] The beneficial effects are as follows: When replacing the brush roller, the support arm is inserted into the insertion holes on both sides of the conveyor belt, and then the conveyor belt is raised by the lifting component so that the arc groove at the top of the support arm fits on the lower surface of the positioning shaft. Then the adjustment component is operated to disassemble the brush roller, which can avoid the problem of the brush roller suddenly falling off, and can also avoid the problem of the brush roller losing support at one end, causing the entire weight of the brush roller to press on the sleeve of the A-group support plate, causing the sleeve to deform under stress.

[0015] In a preferred embodiment, multiple elastic support components are fixed on both sides inside the frame, and multiple pressure rollers are rotatably connected between the multiple elastic support components on both sides, with the multiple pressure rollers arranged on the front and rear sides of the brush roller.

[0016] Furthermore, the elastic support assembly includes two limiting posts fixed in the frame, a slider slidably connected between the two limiting posts, the end of the pressure roller rotatably connected in the slider, a pressure beam fixed to the top of the two limiting posts by bolts, a positioning post fixedly connected to the top of the slider and the bottom of the pressure beam, and a spring sleeved on the outer surface of the positioning post.

[0017] The beneficial effects are as follows: when the sheet metal workpiece passes under the pressure roller, the sheet metal workpiece pushes upward against the pressure roller, causing the spring to be compressed. Thus, the downward pressure provided by the spring to the pair of pressure rollers can steadily press the sheet metal workpiece onto the conveyor belt, avoiding the problem of the high-speed rotating brush roller contacting the sheet metal workpiece and rapidly transmitting the sheet metal workpiece backward, thus ensuring the stable transmission of the sheet metal workpiece.

[0018] In a preferred embodiment, the support plate includes a U-shaped seat and a top plate fixed to the top of the U-shaped seat by bolts. The U-shaped seat of group A is directly fixed inside the frame, and the U-shaped seat of group B is slidably connected between the two limiting plates. The lead screw is threaded inside the U-shaped seat, and a vertical guide rod is fixedly connected inside the U-shaped seat. A movable plate is slidably connected to the outer surface of the guide rod. The rotating shaft is rotatably connected inside the movable plate, and a second spring is sleeved on the outer surface of the guide rod, with the second spring located between the top plate and the movable plate.

[0019] Furthermore, a tensioning pulley that presses against the belt is installed inside the frame.

[0020] The beneficial effects are as follows: When drawing the wire, if the conveyor belt rises too high due to operational errors, the brush roller can move upward under force, providing room for error. This avoids the problem of the conveyor belt hitting the brush roller due to operational errors, which would cause the positioning shaft at the end of the brush roller to deform and be damaged. During the upward movement of the brush roller, the tensioning wheel can loosen the belt, preventing the belt from being pulled apart.

[0021] A further preferred embodiment is that the tensioning wheel includes a positioning block, a screw and a slide rod are slidably connected inside the positioning block, a support block is welded to one end of the screw and the slide rod, a spring is sleeved on the outer surface of the screw between the support block and the positioning block, and a nut is threadedly connected to the outer surface of the screw. A pressure wheel is rotatably connected to one side of the support block.

[0022] The beneficial effects are: when the belt is severely worn and needs to be replaced, the nut can be rotated to bring the support block and the positioning block closer together, thereby causing the pressure roller to loosen the belt, which will make the belt loose and facilitate the disassembly and assembly of the belt.

[0023] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0024] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0025] Figure 1 This is a schematic diagram of the structure of this utility model.

[0026] Figure 2 This is a first-view structural schematic diagram of the support plate and adjustment assembly in Embodiment 1 of this utility model.

[0027] Figure 3 This is a structural schematic diagram of the support plate and adjustment assembly from a second perspective in Embodiment 1 of this utility model.

[0028] Figure 4This is a schematic diagram of the structure of the brush roller of this utility model.

[0029] Figure 5 This is a schematic diagram of the elastic support component and pressure roller of this utility model.

[0030] Figure 6 This is a schematic diagram of the conveyor belt structure of this utility model.

[0031] Figure 7 This is a schematic diagram of the lifting assembly of this utility model.

[0032] Figure 8 This is a first-view structural schematic diagram of the support plate and adjustment assembly in Embodiment 3 of this utility model.

[0033] Figure 9 This is a structural schematic diagram of the support plate and adjustment assembly from a second perspective in Embodiment 3 of this utility model.

[0034] Figure 10 This is a schematic diagram of the tensioner wheel of this utility model.

[0035] The components include: 1. Frame; 11. Pulley 1; 12. Motor; 13. Pulley 2; 14. Belt; 2. Support plate; 21. Rotating shaft; 22. Sleeve; 23. U-shaped seat; 24. Top plate; 25. Guide rod; 26. Movable plate; 27. Spring 2; 3. Brush roller; 31. Positioning shaft; 4. Adjustment assembly; 41. Limit plate; 42. Bearing seat; 43. Lead screw; 44. Rotary handle; 5. Lifting assembly; 51. Worm gear lift; 52. Servo motor; 53. Drive shaft. 54. Synchronous pulley one; 55. Synchronous belt one; 56. Synchronous pulley two; 57. Synchronous pulley three; 58. Synchronous belt two; 6. Conveyor belt; 61. Insertion hole; 62. Support arm; 63. Arc groove; 7. Elastic support assembly; 71. Limiting post; 72. Slider; 73. Pressure beam; 74. Positioning post; 75. Spring one; 8. Pressure roller; 9. Tensioner wheel; 91. Positioning block; 92. Screw; 93. Slide rod; 94. Support block; 95. Spring three; 96. Nut; 97. Pressure roller. Detailed Implementation

[0036] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0037] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0038] This utility model provides an automatic wire drawing machine.

[0039] Example 1:

[0040] like Figure 1 As shown, it includes a frame 1, four support plates 2, two brush rollers 3, two adjusting components 4, a lifting component 5, and a conveyor belt 6.

[0041] like Figure 2-4 As shown, a rotating shaft 21 is rotatably connected inside the support plate 2, and a sleeve 22 is fixedly connected to one end of the rotating shaft 21. A positioning shaft 31 is fixedly connected to the center of both ends of the brush roller 3. The positioning shaft 31 is inserted into the inside of the sleeve 22, and a rack is provided on the outer surface of the end of the positioning shaft 31. The inner wall of the sleeve 22 is provided with a toothed groove that meshes with the rack, thereby ensuring that the positioning shaft 31 is inserted into the sleeve 22, and the brush roller 3 can rotate synchronously when the sleeve 22 rotates.

[0042] like Figure 1-3 As shown, the four support plates 2 are divided into two groups, A and B. Each group includes two support plates 2. The two support plates 2 of group A are directly welded and fixed to one side of the frame 1. One end of the rotating shaft 21 in the support plate 2 of group A is keyed to pulley 11. Two motors 12 are fixedly installed at the bottom of the frame 1. The output shaft of the motor 12 is keyed to pulley 13. Pulley 13 and pulley 11 are connected by belt 14.

[0043] like Figure 1-3 As shown, the adjustment assembly 4 includes two limiting plates 41 and a bearing seat 42. The two limiting plates 41 and the bearing seat 42 are welded and fixed to one side of the frame 1. The support plate 2 of group B is slidably connected between the two limiting plates 41. A lead screw 43 is rotatably connected inside the bearing seat 42. The lead screw 43 is threaded inside the support plate 2 of group B, and one end of the lead screw 43 is fixedly connected to a handle 44. By rotating the handle 44, the lead screw 43 rotates inside the support plate 2 of group B, thereby adjusting the distance between the support plates 2 of groups A and B.

[0044] like Figure 1As shown, a lifting assembly 5 is installed inside the frame 1, and a conveyor belt 6 is installed above the lifting assembly 5. The lifting assembly 5 can adjust the distance between the conveyor belt 6 and the brush roller 3 by lifting the conveyor belt 6, thereby performing wire drawing processing on sheet metal workpieces of different thicknesses.

[0045] like Figure 1 As shown, multiple elastic support components 7 are fixed on both sides inside the frame 1, and multiple pressure rollers 8 are rotatably connected between the multiple elastic support components 7 on both sides. The multiple pressure rollers 8 are arranged on the front and rear sides of the brush roller 3 to press down the workpiece. This avoids the problem of the high-speed rotating brush roller 3 contacting the workpiece and rapidly transmitting the workpiece to the rear, thus ensuring the stable transmission of the workpiece.

[0046] Specifically, such as Figure 5 As shown, the elastic support assembly 7 includes two limiting posts 71 fixed in the frame 1, and a slider 72 slidably connected between the two limiting posts 71. The end of the pressure roller 8 is rotatably connected in the slider 72. The top of the two limiting posts 71 is fixed with a pressure beam 73 by bolts. The top of the slider 72 and the bottom of the pressure beam 73 are both welded with positioning posts 74. A spring 75 is sleeved on the outer surface of the positioning post 74. The spring 75 provides a downward force to the pressure roller 8 through the slider 72. So when the sheet metal workpiece passes under the pressure roller 8, the sheet metal workpiece pushes the pressure roller 8 upward, causing the spring 75 to be compressed. Thus, the downward pressure provided by the spring 75 to the pressure roller 8 can steadily press the sheet metal workpiece onto the conveyor belt 6.

[0047] The working principle of this embodiment is as follows: When in use, the motor 12 drives the brush roller 3 to rotate at high speed. According to the thickness of the workpiece, the distance between the conveyor belt 6 and the brush roller 3 is adjusted by the lifting component 5. Then, the workpiece that needs to be wire drawn is placed above the conveyor belt 6. The conveyor belt 6 drives the workpiece into the area below the brush roller 3, so that the high-speed rotating brush roller 3 performs wire drawing processing on the upper surface of the workpiece.

[0048] When the brush roller 3 is severely worn and needs to be replaced, the screw 43 is rotated by the handle 44, which moves the support plate 2 of group B away from the support plate 2 of group A. As a result, the sleeve 22 slides out from the surface of the positioning shaft 31 at the end of the brush roller 3, and the brush roller 3 can be removed. The new brush roller 3 can be installed by reversing the operation.

[0049] Example 2:

[0050] like Figure 6As shown, based on Embodiment 1, the frames on both sides of the conveyor belt 6 are provided with insertion holes 61 corresponding to the positioning shaft 31. A support arm 62 is inserted into the insertion hole 61. An arc groove 63 is provided on the top of the support arm 62. When disassembling the brush roller 3, the conveyor belt 6 can be raised by the lifting component 5 so that the support arm 62 supports the positioning shaft 31 at the end of the brush roller 3 through the arc groove 63. Then, the position of the B group support plate 2 is adjusted by the screw 43 so that the sleeve 22 slides out from the surface of the positioning shaft 31. Finally, the brush roller 3 can be removed for replacement. This can avoid the problem that the brush roller 3 will suddenly lose support and fall and hit the conveyor belt 6 when disassembling the brush roller 3.

[0051] Furthermore, such as Figure 7 As shown, the lifting assembly 5 includes four worm gear lifts 51 installed in the frame 1 and a servo motor 52. The top ends of the lifting screws of the four worm gear lifts 51 are fixed to the bottom of the frames on both sides of the conveyor belt 6. Two adjacent worm gear lifts 51 with overlapping worm shafts are connected by a drive shaft 53. The worm ends of the two worm gear lifts 51 with parallel worm shafts are equipped with synchronous pulleys 54, and the two synchronous pulleys 54 are connected by a synchronous belt 55. The servo motor 52 is installed inside the frame 1. One of the worm gear lifts 51 has a synchronous pulley 56 installed at the worm end, and a synchronous pulley 57 is installed at the output shaft end of the servo motor 52. The synchronous pulley 57 and the synchronous pulley 56 are connected by a synchronous belt 58.

[0052] The working principle of this embodiment is as follows: When replacing the brush roller 3, first insert the support arm 62 into the insertion holes 61 on both sides of the conveyor belt 6, then raise the conveyor belt 6 by the lifting component 5, so that the arc groove 63 at the top of the support arm 62 fits onto the lower surface of the positioning shaft 31, then operate the adjusting component 4 to make the sleeve 22 slide out from the surface of the positioning shaft 31, and finally pull the brush roller 3 towards the B group support plate, so that the positioning shaft 31 at the other end of the brush roller 3 slides out from the sleeve 22 on the A group support plate, and the brush roller 3 can be disassembled. This avoids the problem of the brush roller 3 suddenly falling, and also avoids the problem of the brush roller 3 losing support at one end, causing the entire weight of the brush roller 3 to press on the sleeve 22 of the A group support plate 2, resulting in the sleeve 22 being deformed by force.

[0053] Example 3:

[0054] like Figure 1 , Figure 8 and Figure 9 As shown, based on Embodiment 1 or Embodiment 2, the support plate 2 includes a U-shaped seat 23 and a top plate 24 fixed to the top of the U-shaped seat 23 by bolts. The U-shaped seat 23 of group A is directly fixed inside the frame 1, and the U-shaped seat 23 of group B is slidably connected between two limiting plates 41, and the lead screw 43 is threadedly connected inside the U-shaped seat 23.

[0055] A vertical guide rod 25 is fixedly connected inside the U-shaped seat 23. A movable plate 26 is slidably connected to the outer surface of the guide rod 25. A rotating shaft 21 is rotatably connected inside the movable plate 26. A second spring 27 is sleeved on the outer surface of the guide rod 25 and is located between the top plate 24 and the movable plate 26, so that the movable plate 26 has space to move up and down. Thus, when the conveyor belt 6 rises too high due to operational errors during wire drawing, the brush roller 3 can move upward under force, providing fault tolerance. This avoids the problem of the positioning shaft 31 at the end of the brush roller 3 being deformed and damaged due to the conveyor belt 6 hitting the brush roller 3 because of operational errors.

[0056] More specifically, a tensioning wheel 9 is installed inside the frame 1 to press on the belt 14. When the movable plate 26 is at its lowest height, the tensioning wheel 9 can press the belt 14 to ensure the stable transmission of the belt 14. When the movable plate 26 moves upward, the belt 14 is further tightened, and the tensioning wheel 9 moves to ensure that the belt 14 will not be pulled off.

[0057] Further preferred, such as Figure 10 As shown, the tensioning wheel 9 includes a positioning block 91. A screw 92 and a slide rod 93 are slidably connected inside the positioning block 91. A support block 94 is welded to one end of the screw 92 and the slide rod 93. A spring 95 is sleeved on the outer surface of the screw 92 between the support block 94 and the positioning block 91, and a nut 96 is threadedly connected to the outer surface of the screw 92. A pressure wheel 97 is rotatably connected to one side of the support block 94. The spring 95 pushes the support block 94, so that the pressure wheel 97 can press the belt 14. When the belt 14 is severely worn and needs to be replaced, the nut 96 can be rotated to bring the distance between the support block 94 and the positioning block 91 closer, so that the pressure wheel 97 can loosen the belt 14, and the belt 14 will loosen, thus facilitating the disassembly and assembly of the belt 14.

Claims

1. An automatic wire drawing machine, characterized in that, It includes a frame (1), four support plates (2), two brush rollers (3), two adjustment components (4), a lifting component (5), and a conveyor belt (6); The support plate (2) is rotatably connected to a rotating shaft (21), and a sleeve (22) is fixedly connected to one end of the rotating shaft (21). A positioning shaft (31) is fixedly connected to the center of both ends of the brush roller (3), and the positioning shaft (31) is inserted into the inside of the sleeve (22). The four support plates (2) are divided into two groups, A and B. Each group includes two support plates (2). The two support plates (2) of group A are directly welded and fixed to one side of the frame (1). One end of the rotating shaft (21) in the support plate (2) of group A is keyed to pulley one (11). Two motors (12) are fixedly installed at the bottom of the frame (1). The output shaft of the motor (12) is keyed to pulley two (13). The pulley two (13) and pulley one (11) are connected by belt (14). The adjustment assembly (4) includes two limiting plates (41) and a bearing seat (42). The two limiting plates (41) and the bearing seat (42) are fixedly connected to one side of the frame (1). The support plate (2) of group B is slidably connected between the two limiting plates (41). A lead screw (43) is rotatably connected inside the bearing seat (42). The lead screw (43) is threadedly connected inside the support plate (2) of group B, and a handle (44) is fixedly connected to one end of the lead screw (43). The frame (1) is equipped with a lifting assembly (5), and a conveyor belt (6) is installed above the lifting assembly (5).

2. The automatic wire drawing machine according to claim 1, characterized in that, The frame on both sides of the conveyor belt (6) has insertion holes (61) corresponding to the positioning shaft (31), and a support arm (62) is inserted into the insertion hole (61). The top of the support arm (62) has an arc groove (63).

3. The automatic wire drawing machine according to claim 2, characterized in that, The lifting assembly (5) includes four worm gear lifts (51) installed in the frame (1) and a servo motor (52). The top of the lifting screw of the four worm gear lifts (51) is fixed to the bottom of the frame on both sides of the conveyor belt (6). Two adjacent worm gear lifts (51) with the worm shafts overlapping are connected by a drive shaft (53). The worm ends of the two worm gear lifts (51) with the worm shafts parallel to each other are equipped with a first synchronous pulley (54), and the two first synchronous pulleys (54) are connected by a first synchronous belt (55). The servo motor (52) is installed inside the frame (1). The worm end of one of the worm gear lifts (51) is equipped with a second synchronous pulley (56), and the output shaft end of the servo motor (52) is equipped with a third synchronous pulley (57). The third synchronous pulley (57) and the second synchronous pulley (56) are connected by a second synchronous belt (58).

4. The automatic wire drawing machine according to claim 1, characterized in that, Multiple elastic support components (7) are fixed on both sides inside the frame (1), and multiple pressure rollers (8) are rotatably connected between the multiple elastic support components (7) on both sides. The multiple pressure rollers (8) are arranged on the front and rear sides of the brush roller (3).

5. The automatic wire drawing machine according to claim 4, characterized in that, The elastic support assembly (7) includes two limiting posts (71) fixed in the frame (1), a slider (72) is slidably connected between the two limiting posts (71), the end of the pressure roller (8) is rotatably connected in the slider (72), the top of the two limiting posts (71) is fixed with a pressure beam (73) by bolts, the top of the slider (72) and the bottom of the pressure beam (73) are both fixedly connected with a positioning post (74), and a spring (75) is sleeved on the outer surface of the positioning post (74).

6. The automatic wire drawing machine according to claim 1, characterized in that, The support plate (2) includes a U-shaped seat (23) and a top plate (24) fixed to the top of the U-shaped seat (23) by bolts. The U-shaped seat (23) of group A is directly fixed inside the frame (1). The U-shaped seat (23) of group B is slidably connected between the two limiting plates (41), and the lead screw (43) is threaded inside the U-shaped seat (23).

7. The automatic wire drawing machine according to claim 6, characterized in that, The U-shaped seat (23) is fixedly connected to a vertical guide rod (25), and a movable plate (26) is slidably connected to the outer surface of the guide rod (25). The rotating shaft (21) is rotatably connected to the inside of the movable plate (26), and a second spring (27) is sleeved on the outer surface of the guide rod (25), and the second spring (27) is located between the top plate (24) and the movable plate (26).

8. The automatic wire drawing machine according to claim 7, characterized in that, The frame (1) is equipped with a tensioning wheel (9) that presses against the belt (14).

9. The automatic wire drawing machine according to claim 8, characterized in that, The tensioning wheel (9) includes a positioning block (91). The positioning block (91) is internally slidably connected with a screw (92) and a slide rod (93). A support block (94) is welded to one end of the screw (92) and the slide rod (93). A spring (95) is sleeved on the outer surface of the screw (92) between the support block (94) and the positioning block (91). A nut (96) is threadedly connected to the outer surface of the screw (92). A pressure wheel (97) is rotatably connected to one side of the support block (94).

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