Efficient combined machining center and using method

Abstract

The invention belongs to the related technical field of machining, and particularly discloses an efficient combined machining center which comprises two sets of mounting bases and a round pipe, the two sets of mounting bases are symmetrically arranged, the interiors of the two sets of mounting bases are connected through correspondingly-arranged connecting beams, and the interiors of the two sets of mounting bases are correspondingly connected with sliding bases through arranged sliding mechanisms; an L-shaped rod is arranged on the upper end face of the sliding seat, a collecting box is arranged on the upper end face of the L-shaped rod, reels are arranged in the collecting box, an abrasive belt is wound around the outer portions of the two reels, and an L-shaped frame is arranged on one side of the upper end face of the L-shaped rod. The distance between the rotating cylinders is dynamically adjusted through the self-adaptive diameter adjusting mechanism, the curved surface of the abutting cylinder is coated with the abrasive belt to increase the contact area, efficient and uniform polishing of the circular pipes of multiple specifications is achieved in combination with composite motion of circular pipe rotation and abrasive belt axial scanning, and the problems that traditional equipment is poor in pipe diameter adaptability and low in polishing efficiency are solved.

Description

Technical Field

[0001] The present invention belongs to the technical field related to mechanical processing, and specifically discloses an efficient composite processing center and a use method thereof. Background Art

[0002] Composite machining centers include various machining mechanisms for various metal parts. Among these, polishing machining centers are high-precision CNC machining equipment that integrates automated grinding and polishing functions. They are primarily used for precision surface treatment of workpieces such as metals, plastics, and composite materials. By removing surface defects (such as burrs, scratches, and oxide layers) and improving surface roughness, they achieve mirror-like, matte, or specific textured finishes. Their core feature is the automation and standardization of the complex processes of traditional manual grinding and polishing, making them suitable for mass production or high-precision surface treatment scenarios.

[0003] Existing belt polishers use a fixed single-belt layout, which has structural design limitations. When the belt tension and contact angle are fixed, they can only process workpieces with specific diameters. When the diameters of the processed pipes vary greatly, the belt needs to be disassembled and replaced or the entire machine structure needs to be adjusted. The replacement cycle is long, which seriously affects the efficiency of mass production. The contact area between the abrasive belt and the round tube is linearly tangent (the contact arc length is usually small, ≤50mm), and multiple reciprocating motions are required to cover the entire tube surface, resulting in excessive polishing in some areas. These problems make it difficult for traditional abrasive belt machines to meet the high-efficiency and high-precision production requirements in batch processing scenarios of multi-specification round tubes (such as furniture steel pipes, automotive oil pipes, and engineering machinery hydraulic pipes).

[0004] Therefore, an efficient composite machining center and a method of using the same are proposed to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to solve the problems existing in the background technology, and to propose an efficient composite machining center, comprising two groups of mounting seats and round tubes, the two groups of mounting seats are symmetrically arranged and are internally connected by corresponding connecting beams, the two groups of mounting seats are internally connected to slides through sliding mechanisms, the upper end face of the slide is provided with an L-shaped rod, the upper end face of the L-shaped rod is provided with a collecting box, the inside of the collecting box is provided with a reel, and an abrasive belt is wound around the outside of the two reels, an L-shaped frame is provided on one side of the upper end face of the L-shaped rod, and a belt-resisting mechanism is provided on the outer wall of one side of the L-shaped frame, and a rotating tube-resisting mechanism is provided on the side where the two groups of mounting seats are close to each other, and the round tube is clamped between the two groups of rotating tube-resisting mechanisms.

[0006] In the above technical solution, further, the sliding mechanism includes a guide rail fixedly arranged on the inner side of the mounting seat, a first screw rod is arranged on the inner side of the mounting seat and above the guide rail, the slide is jointly arranged on the outside of the first screw rod and the guide rail, the first screw rod is threadedly engaged with the slide, and the lower end of the inner part of the slide is slidingly engaged with the guide rail.

[0007] In the above technical solution, further, the belt-resisting mechanism includes a U-shaped frame fixedly arranged on the outer wall of one side of the L-shaped frame, a second screw rod is rotatably installed on the inner side of the U-shaped frame, a fourth motor is fixedly installed on the outer side of one end of the U-shaped frame, the output end of the fourth motor is fixedly connected to one end of the second screw rod, a slider is threadedly sleeved on the outer side of the second screw rod, one side of the slider slides in fit with the inner wall of the U-shaped frame, a support seat is fixedly installed on the outer side of the slider, a second hydraulic cylinder is arranged inside the support seat, a clamping sleeve is connected to the telescopic end of the second hydraulic cylinder, a clamping rod is arranged inside the clamping sleeve, a pressure cylinder is arranged on the end of the clamping rod, and clamping rings are installed at both ends of the outer side of the pressure cylinder, and the pressure cylinder is in contact with the outer surface of one side of the sanding belt.

[0008] In the above technical solution, further, the rotating tube-pushing mechanism includes a mounting plate fixedly arranged on the outside of the mounting seat, a first hydraulic cylinder is arranged inside the mounting plate, a stop block is fixedly installed on the output end of the first hydraulic cylinder, a mounting frame is arranged on the upper end face of the stop block, a rod shaft passes through the inside of the mounting frame, rotating drums are mounted on both ends of the outside of the rod shaft, and a second motor is arranged on the outside of one group of the rotating drums, the second motor is fixedly mounted on the outside of one of the connecting beams and the output end is connected to one end of the rotating drum, and the round tube and the rotating drum are in rolling fit.

[0009] In the above technical solution, further, a third motor is fixedly installed on one side of the collection box, an output end of the third motor is connected to the reel, a clamping plate is provided on the outside of the collection box, and the sanding belt slides inside the clamping plate.

[0010] In the above technical solution, further, the first clamping roller and the second clamping roller are rotatably installed at the inner corners of the L-shaped frame, and the first clamping roller and the second clamping roller are rotatably sleeved on the outside with the first clamping roller and the second clamping roller, respectively, and the sanding belt passes between the first clamping jacket and the second clamping jacket.

[0011] In the above technical solution, further, positioning pins are symmetrically installed on the upper surface of the splint, and the ends of the positioning pins are in active contact with the outer surface of the sanding belt. A first motor is installed on the outer side of one end of the mounting seat, and the first motor is connected to one end of the first screw rod.

[0012] A method for using an efficient composite machining center, using the above-mentioned efficient composite machining center, includes the following steps: S1: According to the diameter of the processed round tube, two sets of symmetrically arranged first hydraulic cylinders can adjust the distance between the rotating drums accordingly. After the adjustment is completed, the round tube is clamped between the four rotating drums; S2: The reels inside the two collection boxes can fit the outer diameter of the round tube. The sanding belt is adjusted with a margin by placing the sanding belt at one end and retracting it at the other end, so that the outer surface of the sanding belt fits the outer surface of the round tube. Then, the positioning pins at the clamping plate are inserted to clamp the current length of the sanding belt. At this time, the belt-pressing mechanism can press the pressing cylinder downward according to the position of the round tube to clamp the sanding belt that fits the outer surface of the round tube, so that the sanding belt that fits the outer upper surface contour of the round tube is always wrapped around the outside of the round tube. S3: The second motor drives the corresponding rotating drum to rotate, and the other rotating drum connected to the corresponding rod shaft rotates synchronously, driving the round tube to rotate. Correspondingly, the round tube rotates, and the two rotating drums on the other side also rotate synchronously. At this time, the sliding mechanism drives the slide to move back and forth, and the round tube is polished efficiently.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. Adaptive grinding of round tubes with different diameters is achieved through the setting of the rotating tube-pushing mechanism and the belt-pushing mechanism. The first hydraulic cylinder in the rotating tube-pushing mechanism can adjust the spacing between the rotating cylinders to adapt to round tubes with different diameters; the second hydraulic cylinder in the belt-pushing mechanism can drive the pressing cylinder to press down, making the abrasive belt fit tightly against the outside of the round tube. The length of the abrasive belt can be adjusted by the reel. The machining center can be dynamically adjusted according to the diameter of the round tube without disassembling and replacing the abrasive belt or adjusting the entire machine structure. This significantly shortens the switching time of workpieces with different diameters (such as furniture steel pipes, automotive oil pipes, etc.) and improves the efficiency of batch processing of multiple specifications.

[0014] 2. The belt-resisting mechanism can press the abrasive belt downwards to tightly wrap the upper surface contour of the round tube, forming a wide range of curved surface contact, breaking through the limitations of linear contact of traditional abrasive belt machines, avoiding local over-polishing, covering a large area in one processing, reducing the number of reciprocating motions, and improving the consistency of the surface treatment of the round tube workpiece.

[0015] 3. The orderly retraction and positioning of the sanding belt are achieved through the provision of structures such as the collection box, the splint and the positioning pins. The third motor drives the reel to rotate, with the sanding belt released at one end and taken up at the other end. The sanding belt can be replaced in time to ensure the sanding effect. The positioning pins can clamp the length of the sanding belt to prevent the sanding belt from loosening and affecting the sanding accuracy. This structural design reduces the waste of the sanding belt, reduces production costs, and also improves the degree of automation of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall connection structure of the present invention from another angle; Figure 3 It is a schematic diagram of the connection structure between the belt mechanism and the collection box of the present invention; Figure 4 A schematic diagram of the connection structure between the abutment mechanism and the collection box of the present invention from another angle; Figure 5 Schematic diagram of the connection structure between the sliding mechanism and the slide seat of the present invention; Figure 6 Schematic diagram of the connection structure between the second motor and the rotating drum of the present invention; Figure 7 For the present invention Figure 5 A magnified schematic diagram of the structure in the middle.

[0017] In the figure: 1. Mounting seat; 2. Connecting beam; 3. First screw rod; 4. First motor; 5. First hydraulic cylinder; 6. Rotating drum; 7. Second motor; 8. L-shaped frame; 9. Sliding seat; 10. Round tube; 11. Collecting box; 12. Second hydraulic cylinder; 13. Third motor; 14. Clamping plate; 15. U-shaped frame; 16. Fourth motor; 17. Mounting frame; 18. Clamping sleeve; 19. L-shaped rod; 20. Abrasive belt; 21. Positioning pin; 22. First clamping roller; 23. Pressure cylinder; 24. Snap ring; 25. Reel; 26. Clamping rod; 27. Second clamping sleeve; 28. Second clamping roller; 29. ​​Second screw rod; 30. Support seat; 31. Sliding block; 32. Rod shaft; 33. Abutment; 34. Guide rail; 35. First clamping sleeve; 36. Mounting plate. DETAILED DESCRIPTION

[0018] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0020] like Figure 1-Figure 7The high-efficiency composite machining center shown in the figure includes two sets of mounting seats 1 and round tubes 10. The two sets of mounting seats 1 are symmetrically arranged and connected internally by corresponding connecting beams 2. The two sets of mounting seats 1 are internally connected to slides 9 through sliding mechanisms. The sliding mechanism includes a guide rail 34 fixedly arranged on the inner side of the mounting seat 1. A first screw rod 3 is arranged on the inner side of the mounting seat 1 and above the guide rail 34. The slide 9 is jointly arranged outside the first screw rod 3 and the guide rail 34. There is a screw rod 3 between the first screw rod 3 and the slide 9. Threaded fit, the lower end of the inner part of the slide 9 is slidably fitted with the guide rail 34, the upper end surface of the slide 9 is provided with an L-shaped rod 19, the upper end surface of the L-shaped rod 19 is provided with a collection box 11, the collection box 11 is provided with a reel 25, the two reels 25 are wound with an abrasive belt 20, an L-shaped frame 8 is provided on one side of the upper end surface of the L-shaped rod 19, and a belt mechanism is provided on the outer wall of one side of the L-shaped frame 8. The two sets of mounting seats 1 are close to each other. A rotating tube mechanism is provided on each side, and the round tube 10 is clamped between the two sets of rotating tube mechanisms; See the instructions attached Figure 1-Figure 4 It can be seen that the first motor 4 drives the first screw 3 to rotate, causing the slide 9 to reciprocate along the outside of the guide rail 34, and later it can assist the sanding belt 20 to complete the polishing operation of the entire pipe. When the slide 9 moves, the L-shaped rod 19 and the L-shaped frame 8 move synchronously, driving the internal mechanism to operate synchronously.

[0021] The belt mechanism includes a U-shaped frame 15 fixedly arranged on the outer wall of one side of the L-shaped frame 8, a second screw rod 29 is rotatably installed on the inner side of the U-shaped frame 15, a fourth motor 16 is fixedly installed on the outer side of one end of the U-shaped frame 15, an output end of the fourth motor 16 is fixedly connected to one end of the second screw rod 29, a slider 31 is threadedly sleeved on the outer side of the second screw rod 29, one side of the slider 31 slides and fits with the inner wall of the U-shaped frame 15, a support seat 30 is fixedly installed on the outer side of the slider 31, a second hydraulic cylinder 12 is arranged inside the support seat 30, a clamping sleeve 18 is connected to the telescopic end of the second hydraulic cylinder 12, a clamping rod 26 is arranged inside the clamping sleeve 18, a pressing cylinder 23 is arranged at the end of the clamping rod 26, and a pressing cylinder 23 is arranged at the end of the pressing cylinder Both ends of the outer side of the cylinder 23 are fitted with a snap ring 24, the pressing cylinder 23 is in contact with the outer surface of one side of the sanding belt 20, the rotating tube-pushing mechanism includes a mounting plate 36 fixedly arranged on the outer side of the mounting seat 1, a first hydraulic cylinder 5 is arranged inside the mounting plate 36, the output end of the first hydraulic cylinder 5 is fixedly mounted with a stop block 33, the upper end surface of the stop block 33 is provided with a mounting frame 17, a rod shaft 32 is passed through the inside of the mounting frame 17, and both ends of the outer side of the rod shaft 32 are fitted with a rotating cylinder 6, and a second motor 7 is provided on the outer side of one group of rotating cylinders 6, the second motor 7 is fixedly mounted on the outer side of one of the connecting beams 2 and the output end is connected to one end of the rotating cylinder 6, and the round tube 10 and the rotating cylinder 6 are in rolling contact; See the instructions attached Figure 5 、 Figure 6 and Figure 7It can be seen that the activation of the first hydraulic cylinder 5 can push the two sets of rotating drums 6 to move. The distance between the rotating drums 6 is adjusted according to the diameter of the processed round tube 10, and then the round tube 10 is placed between the rotating drums 6. The second motor 7 drives the rotating drum 6 to rotate, and the round tube 10 rotates synchronously with the corresponding rotating drum 6. At the same time, the first motor 4 drives the slide 9 to reciprocate along the guide rail 34. The sanding belt 20 grinds the outer surface of the round tube 10 in a spiral track. During the grinding process, the pressure cylinder 23 can always ensure linear contact with the sanding belt 20, and the retaining ring 24 limits the lateral deviation of the sanding belt 20. The fourth motor 16 drives the second screw 29 to rotate, and the slider 31 drives the support seat 30 and the pressure cylinder 23 to move to the top of one side of the circular tube 10. The second hydraulic cylinder 12 slowly extends until the pressure cylinder 23 contacts the sanding belt 20. An external pressure sensor can be added to one end of the second hydraulic cylinder 12. The pressure sensor feedback is adjusted to the preset pressure to maintain a certain pressure during the pressure process.

[0022] A third motor 13 is fixedly installed on one side of the collecting box 11, and the output end of the third motor 13 is connected to the reel 25. A plywood 14 is provided on the outside of the collecting box 11, and the sanding belt 20 slides inside the plywood 14. Positioning pins 21 are symmetrically installed on the upper surface of the plywood 14, and the end of the positioning pin 21 is in active contact with the outer surface of the sanding belt 20. A first motor 4 is installed on the outside of one end of the mounting seat 1, and the first motor 4 is connected to one end of the first screw rod 3. The first clamping roller 22 and the second clamping roller 28 are rotatably installed at the internal corners of the L-shaped frame 8, and the first clamping roller 22 and the second clamping roller 28 are rotatably sleeved on the outside with a first jacket 35 and a second jacket 27, respectively. The sanding belt 20 passes through the first jacket 35 and the second jacket 27; See the instructions attached Figure 3 and Figure 4 It can be seen that the third motor 13 inside the collecting box 11 on one side drives the reel 25 to release the sanding belt 20. The sanding belt 20 is guided by the clamping plate 14, the first clamping roller 22 and the second clamping roller 28 and then adheres to the upper surface of the round tube 10, so that the length of the sanding belt 20 can be adjusted. When the use length of the sanding belt 20 is determined, the third motor 13 at the other end drives the reel 25 to reel in the excess sanding belt 20 to prevent one side of the sanding belt 20 from scratching the external structure of the device during the lateral movement. Then, the positioning pin 21 at the clamping plate 14 is inserted into the upper surface of one side of the sanding belt 20 to complete the length fixing of the sanding belt 20. The first clamping roller 22 and the second clamping roller 28 can reduce friction during the winding operation, and the clamping plate 14 facilitates the mechanical fixation of the abrasive belt 20. The abrasive belt 20 used in the machining center can be used with a certain thickness specification, and can avoid the belt from turning over during the lateral movement.

[0023] A method for using an efficient composite machining center, using the above-mentioned efficient composite machining center, includes the following steps: S1: According to the diameter of the processed round tube 10, two sets of symmetrically arranged first hydraulic cylinders 5 can adjust the distance between the rotating drums 6 accordingly. After the adjustment is completed, the round tube 10 is clamped between the four rotating drums 6; S2: The reels 25 inside the two sets of collection boxes 11 can fit the outer diameter of the circular tube 10. The sanding belt 20 is adjusted with a margin in the manner of placing the sanding belt 20 at one end and collecting the sanding belt 20 at the other end, so that the outer surface of the sanding belt 20 fits the outer surface of the circular tube 10. Then, the positioning pins 21 at the clamping plate 14 are inserted to clamp the current length of the sanding belt 20. At this time, the belt-pressing mechanism can press the pressing cylinder 23 downward according to the position of the circular tube 10 to clamp the sanding belt 20 that fits the outer surface of the circular tube 10, so that the sanding belt 20 that fits the outer upper surface contour of the circular tube 10 is always covered on the outside of the circular tube 10. S3: The second motor 7 drives the corresponding rotating drum 6 to rotate, and the other rotating drum 6 connected to the corresponding rod shaft 32 rotates synchronously, driving the round tube 10 to rotate. Correspondingly, the round tube 10 rotates, and the two rotating drums 6 on the other side also rotate synchronously. At this time, the sliding mechanism drives the slide seat 9 to move back and forth, and the round tube 10 is polished efficiently.

[0024] Working principle: Start two sets of symmetrically arranged first hydraulic cylinders 5, push the stop block 33 and the mounting frame 17, and make the four rotating drums 6 adjust the spacing synchronously until the round tube 10 is stably stuck between the four rotating drums 6. The reels 25 in the two sets of collecting boxes 11 are driven by the third motor 13, which drives the reel 25 at one end to unwind the belt. The sanding belt 20 passes through the first clamping roller 22 and the second clamping roller 28, and the first jacket 35 and the second jacket 27 to reduce friction loss, so that the middle section naturally fits the outer surface of the round tube 10. Then, the reel 25 at the other end reels the excess sanding belt 20 while ensuring the adhesion, and then screws the positioning pin 21 into the inside of the clamping plate 14 to lock the current use length of the sanding belt 20. The fourth motor 16 drives the second screw 29 to rotate, causing the slider 31 to fine-tune the position of the support seat 30 laterally, ensuring that the second hydraulic cylinder 12 can press the pressing cylinder 23 downward on one side of the abrasive belt 20, pressing the abrasive belt 20 so that it tightly wraps around the outer upper surface of the circular tube 10. This process can fully increase the contact area of ​​the abrasive belt 20, allowing it to wrap around the outer curved surface of the circular tube 10. The second motor 7 drives the rotating drum 6 at the corresponding position on one side to rotate. Under the connection of the rod shaft 32, the two rotating drums 6 on the same side rotate synchronously, driving the round tube 10 to rotate, and the two rotating drums 6 on the other side are driven synchronously. During the rotation process, the first motor 4 drives the first screw 3 to move the slide 9 along the outside of the guide rail 34, driving the L-shaped rod 19 and the L-shaped frame 8 to move, prompting the rotating round tube 10 and the sanding belt 20 to form a spiral polishing trajectory. A single formation can cover the entire tube surface, and finally the processing of the curved workpiece is completed efficiently.

[0025] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. Various changes and improvements are possible without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the invention as claimed.

Claims

1. An efficient composite machining center, comprising two sets of mounting bases (1) and round tubes (10), characterized in that: The two groups of mounting seats (1) are symmetrically arranged and are internally connected by corresponding connecting beams (2). The two groups of mounting seats (1) are internally connected to a slide seat (9) through a sliding mechanism. The upper end surface of the slide seat (9) is provided with an L-shaped rod (19). The upper end surface of the L-shaped rod (19) is provided with a collection box (11). A reel (25) is provided inside the collection box (11). An abrasive belt (20) is wound around the outside of the two reels (25). An L-shaped frame (8) is provided on one side of the upper end surface of the L-shaped rod (19). A belt-resisting mechanism is provided on one side of the outer wall of the L-shaped frame (8). A rotating pipe-resisting mechanism is provided on the side where the two groups of mounting seats (1) are close to each other, and the round pipe (10) is clamped between the two groups of rotating pipe-resisting mechanisms.

2. The high-efficiency composite machining center according to claim 1, characterized in that: The sliding mechanism comprises a guide rail (34) fixedly arranged on the inner side of the mounting seat (1); a first screw rod (3) is arranged on the inner side of the mounting seat (1) and above the guide rail (34); the slide seat (9) is arranged outside the first screw rod (3) and the guide rail (34); the first screw rod (3) and the slide seat (9) are threadedly engaged; and the lower end of the inner side of the slide seat (9) is slidably engaged with the guide rail (34).

3. The high-efficiency composite machining center according to claim 1, characterized in that: The belt mechanism comprises a U-shaped frame (15) fixedly arranged on the outer wall of one side of the L-shaped frame (8), a second screw rod (29) is rotatably mounted on the inner side of the U-shaped frame (15), a fourth motor (16) is fixedly mounted on the outer side of one end of the U-shaped frame (15), an output end of the fourth motor (16) is fixedly connected to one end of the second screw rod (29), a slider (31) is threadedly sleeved on the outer side of the second screw rod (29), and one side of the slider (31) is slidably fitted with the inner wall of the U-shaped frame (15) A support seat (30) is fixedly installed on the outside of the slider (31), a second hydraulic cylinder (12) is arranged inside the support seat (30), a clamping sleeve (18) is connected to the telescopic end of the second hydraulic cylinder (12), a clamping rod (26) is arranged inside the clamping sleeve (18), a pressure cylinder (23) is arranged at the end of the clamping rod (26), and a clamping ring (24) is provided on both ends of the outside of the pressure cylinder (23), and the pressure cylinder (23) is in contact with the outer surface of one side of the sanding belt (20).

4. The high-efficiency composite machining center according to claim 1, characterized in that: The rotating tube-pushing mechanism comprises a mounting plate (36) fixedly arranged on the outside of the mounting seat (1), a first hydraulic cylinder (5) is arranged inside the mounting plate (36), a stop block (33) is fixedly mounted on the output end of the first hydraulic cylinder (5), a mounting frame (17) is arranged on the upper end face of the stop block (33), a rod shaft (32) is passed through the inside of the mounting frame (17), a rotating drum (6) is fitted on both ends of the outside of the rod shaft (32), and a second motor (7) is arranged on the outside of one group of the rotating drums (6), the second motor (7) is fixedly mounted on the outside of one of the connecting beams (2) and the output end is connected to one end of the rotating drum (6), and the circular tube (10) and the rotating drum (6) are in rolling contact.

5. The high-efficiency composite machining center according to claim 1, characterized in that: A third motor (13) is fixedly mounted on one side of the collection box (11), an output end of the third motor (13) is connected to a reel (25), a clamping plate (14) is provided on the outside of the collection box (11), and the sanding belt (20) slides inside the clamping plate (14).

6. The high-efficiency composite machining center according to claim 1, characterized in that: A first clamping roller (22) and a second clamping roller (28) are rotatably mounted at the inner corners of the L-shaped frame (8), and a first clamping sleeve (35) and a second clamping sleeve (27) are rotatably mounted on the outer sides of the first clamping roller (22) and the second clamping roller (28), respectively. The abrasive belt (20) passes between the first clamping sleeve (35) and the second clamping sleeve (27).

7. The high-efficiency composite machining center according to claim 5, characterized in that: Positioning pins (21) are symmetrically mounted on the upper surface of the clamping plate (14), and the ends of the positioning pins (21) are in movable contact with the outer surface of the sanding belt (20). A first motor (4) is mounted on the outer side of one end of the mounting seat (1), and the first motor (4) is connected to one end of the first screw rod (3).

8. A method for using an efficient composite machining center, using the efficient composite machining center according to any one of claims 1 to 7, comprising the following steps: S1: According to the diameter of the processed round tube (10), two sets of symmetrically arranged first hydraulic cylinders (5) can adjust the spacing between the rotating drums (6) accordingly. After the adjustment is completed, the round tube (10) is clamped between the four rotating drums (6); S2: The reels (25) inside the two sets of collecting boxes (11) can fit the outer diameter of the circular tube (10), and the sanding belt (20) is adjusted with a margin in a manner that the sanding belt (20) is placed at one end and the sanding belt (20) is collected at the other end, so that the outer surface of the sanding belt (20) fits the outer surface of the circular tube (10), and then the positioning pin (21) at the clamping plate (14) is inserted to clamp the length of the current sanding belt (20). At this time, the belt-pushing mechanism can press the pressing cylinder (23) downward according to the position of the circular tube (10) to clamp the sanding belt (20) that fits the outer surface of the circular tube (10), so that the sanding belt (20) that fits the outer upper surface contour of the circular tube (10) is always covered on the outside of the circular tube (10); S3: The second motor (7) drives the corresponding rotating drum (6) to rotate, and the other rotating drum (6) connected to the corresponding rod shaft (32) rotates synchronously, driving the round tube (10) to rotate. Correspondingly, the round tube (10) rotates, and the two rotating drums (6) on the other side also rotate synchronously. At this time, the sliding mechanism reciprocates to drive the slide seat (9) to move, and the round tube (10) is polished efficiently.

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