An arc surface polishing and rounding positioning and fixing structure for plastic processing

Abstract

The application relates to the technical field of plastic processing, in particular to an arc surface polishing and rounding positioning and fixing structure for plastic processing, which comprises a polishing table and an air pump arranged at the top end of the polishing table, a placing slot is arranged on the upper surface of the lower end of the polishing table, a fixed supporting plate is fixedly connected to the bottom of the inner cavity of the placing slot, a lifting plate is fixedly connected to the bottom end of the air pump, a lifting cover is fixedly connected to the bottom end of the lifting plate, a driving motor is fixedly connected to the upper end of the lifting cover, a polishing mechanism is arranged in the inner cavity of the lifting cover, a fixed sleeve rod is fixedly connected to the top of the inner cavity of the lifting cover, and a movable inserting rod is movably inserted into the bottom end of the fixed sleeve rod. The arc surface polishing and rounding positioning and fixing structure for plastic processing can polish the rounding of plastic plates with different lengths and widths, has a larger application range, can polish the edges at the intersection of the rounding and the upper and lower planes of the plastic plate, further improves the polishing effect of the rounding of the plastic plate, and prevents redundant burrs.

Description

Technical Field

[0001] This invention relates to the field of plastic processing technology, specifically to a curved surface grinding and rounding positioning and fixing structure for plastic processing. Background Technology

[0002] Plastic is the most widely used material today, used to make plastic oil funnels, plastic tubes, models, etc. During the manufacturing process, these plastic parts are prone to producing rough surfaces or burrs. Often, it is necessary to sand the edges of the plastic parts to prevent them from affecting workers in subsequent processing steps. Plastic sanding is a process of treating the surface of plastic to make it smoother and flatter. This process can be done manually or mechanically. For example, manual sanding can be done with sandpaper: using sandpaper of different grits to sand the plastic surface, gradually removing the unevenness and marks on the surface to achieve the required smoothness. Alternatively, mechanical sanding can be used, such as using a sanding machine with appropriate abrasive and sanding pads.

[0003] In the existing technology, if manual grinding is used, it is difficult to guarantee the grinding accuracy and it will reduce the overall production efficiency of plastic processing. If mechanical grinding is used, the existing plastic grinding equipment is not convenient to fix the plastic to be ground, and when grinding rounded corners, it is not convenient to fully grind the edges at the intersection of the rounded corners and the upper and lower planes, which reduces the overall grinding quality. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a curved surface grinding and rounding positioning and fixing structure for plastic processing.

[0005] The present invention adopts the following technical solution: a positioning and fixing structure for grinding rounded corners of arc surfaces in plastic processing, comprising a grinding table and an air pump disposed at the top of the grinding table. The upper surface of the lower end of the grinding table is provided with a placement slot. A fixed support plate is fixedly connected to the bottom of the inner cavity of the placement slot. A lifting plate is fixedly connected to the bottom of the air pump, and a lifting cover is fixedly connected to the bottom of the lifting plate. A drive motor is fixedly connected to the upper end of the lifting cover. A grinding mechanism is provided in the inner cavity of the lifting cover. A fixed sleeve rod is fixedly connected to the top of the inner cavity of the lifting cover. A movable insert rod is inserted vertically at the bottom of the fixed sleeve rod. A first spring is fixedly connected between the top of the movable insert rod and the fixed sleeve rod. An automatic adjustment mechanism is provided at each of the four corners inside the lifting cover. An edge polishing mechanism is provided on the grinding mechanism. The grinding mechanism includes a reversing component located at the center of the upper interior of the lifting cover. The reversing component includes a first gear rotatably mounted inside the top of the lifting cover. The upper end of the first gear is fixed to the output end of a drive motor. A first half-gear is coaxially mounted on the lower side of the first gear. A second gear is meshed with one side of the first gear. A second half-gear is coaxially mounted on the lower side of the second gear. A third gear is rotatably mounted on one side of the second and first half-gears within the lifting cover. A fourth gear is coaxially mounted on the lower side of the third gear. Fourth gears are meshed with all four sides of the fourth gear. A fourth gear is located on one side of the fourth gear on its periphery. A transmission belt connects the central shaft of the fourth gear located on the periphery of the first bevel gear and the central shaft of the first bevel gear. A second bevel gear is rotatably mounted on one side of the first bevel gear inside the lifting cover. The second bevel gear and the first bevel gear are connected by an automatic adjustment mechanism. A threaded rod is fixedly connected to the center of the bottom end of the second bevel gear. Threaded blocks are threadedly connected to the outer walls of both the upper and lower ends of the threaded rod. A limit block is fixedly connected to the end of the threaded block near the inner wall of the lifting cover. The end of the limit block away from the threaded block abuts against the inner wall of the lifting cover. A moving block is provided on the side of the threaded block away from the limit block. Arc-shaped grinding blocks are fixedly connected to the opposite ends of the upper and lower moving blocks.

[0006] As a further description of the above technical solution: the automatic adjustment mechanism includes a third bevel gear meshing with the first bevel gear, a fixed pin fixedly connected to the end of the third bevel gear away from the first bevel gear, a movable pin movably inserted at the end of the fixed pin away from the third bevel gear, a second spring fixedly connected between the end of the movable pin located inside the fixed pin and the fixed pin, a fourth bevel gear fixedly connected to the end of the movable pin away from the fixed pin, the fourth bevel gear meshing with the second bevel gear, a connecting rod fixedly connected to one side wall of the moving block near the threaded block, the other end of the connecting rod movably inserted into the threaded block, a third spring fixedly connected between the end of the connecting rod located inside the threaded block and the threaded block, a first inclined sliding surface being provided at both the upper and lower ends of the threaded block, and a second inclined sliding surface being provided on both the upper and lower sides of the end of the moving block away from the threaded block.

[0007] As a further description of the above technical solution: a square groove is provided on the side wall of the arc-shaped grinding block away from the threaded block, and a pressing fixing plate is fixedly connected to the bottom end of the inner cavity of the square groove. A lifting frame is provided on the upper side of the pressing fixing plate inside the arc-shaped grinding block, and the lifting frame is slidably arranged inside the arc-shaped grinding block. A fourth spring is fixedly connected between the bottom end of the lifting frame and the arc-shaped grinding block. A sliding block is slidably arranged at the bottom end of the lifting frame. A fifth spring is fixedly connected between the upper side wall of the sliding block and the lifting frame. A grinding frame is fixedly connected to the end of the sliding block away from the arc-shaped grinding block.

[0008] As a further description of the above technical solution: the external teeth of the second half gear and the first half gear are both provided with half a circle, the first half gear and the second half gear are distributed vertically, the third gear is meshed with the second half gear or the first half gear, and the external teeth of the first half gear and the second half gear are arranged in symmetrical directions.

[0009] As a further description of the above technical solution: the external threads on the outer walls of the upper and lower ends of the threaded rod are in opposite directions.

[0010] As a further description of the above technical solution: the threaded rod is located at the four corners of the inner cavity of the lifting cover.

[0011] As a further description of the above technical solution: the upper and lower ends of the moving block are both provided with a first inclined sliding surface.

[0012] As a further description of the above technical solution: the bottom end of the sliding block and the upper end of the pressing and fixing plate are both provided with mutually parallel inclined surfaces.

[0013] This invention provides an improved positioning and fixing structure for grinding rounded corners on curved surfaces in plastic processing, which has the following improvements and advantages compared with the prior art: Firstly, starting the drive motor causes the first gear to rotate, which in turn causes the third gear to rotate periodically in both directions. The threaded blocks can then move up and down periodically. Because the external threads on the upper and lower ends of the threaded rod are in opposite directions, the two threaded blocks move towards or away from each other. This ensures that the force on the plastic sheet is balanced when it is being squeezed, preventing the plastic sheet from moving. When the threaded blocks move up and down, the arc-shaped grinding blocks on the moving blocks grind the rounded corners of the four corners of the plastic sheet. The grinding mechanism allows for grinding of the four rounded corners of the plastic sheet with just one drive motor, making it convenient to use. Secondly: Before using the device, place the plastic plate on the upper surface of the fixed support plate, then start the air pump. The air pump will drive the lifting plate and lifting cover to move downwards. Then, the bottom end of the movable insert will press against the upper surface of the plastic plate, fixing the plastic plate in place. As the lifting cover continues to move downwards, due to the pressure from the side of the plastic plate, the threaded block and moving block located on the bottom side will move away from the plastic plate, causing the movable insert to compress into the fixed insert. Then, the plastic plate will move to the middle of the upper and lower moving blocks. Due to the setting of the second inclined sliding surface, the side of the plastic plate will press the moving block against the threaded block. After that, the plastic plate will be located between the upper and lower grinding frames. Through the setting of the automatic adjustment mechanism, the device can grind the rounded corners of plastic plates of different lengths and widths, making it more applicable. Thirdly: After the moving block moves, the plastic plate will squeeze the grinding frame. Under the pressure of the pressing plate, the grinding frame slides to the other end of the lifting frame. Then the arc-shaped grinding block moves in the opposite direction, and the grinding frame moves back to its original position. When the grinding is completed, the drive motor is turned off, and the air pump moves the lifting cover upward. Through the setting of the edge polishing mechanism, the grinding frame can grind the edges of the plastic plate's rounded corners and the intersection of the upper and lower planes, further improving the grinding effect of the plastic plate's rounded corners and preventing excess burrs. In summary, the grinding mechanism allows for grinding of the four rounded corners of a plastic sheet with just one drive motor, making it convenient to use. The automatic adjustment mechanism enables the device to grind the rounded corners of plastic sheets of different lengths and widths, broadening its applicability. The edge polishing mechanism allows the grinding frame to grind the edges where the rounded corners of the plastic sheet intersect with the upper and lower planes, further improving the grinding effect at the rounded corners and preventing excess burrs. Attached Figure Description

[0014] The present invention will be further explained below with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of a plastic processing arc-shaped surface grinding rounded corner positioning and fixing structure provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the movable insertion rod provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure where the movable insert rod and the fixed sleeve rod are separated, as provided in an embodiment of the present invention. Figure 4 This is a schematic diagram of the transmission belt structure provided in an embodiment of the present invention; Figure 5 A schematic diagram of the inversion component provided in an embodiment of the present invention. Figure 1 ; Figure 6 A schematic diagram of the inversion component provided in an embodiment of the present invention. Figure 2 ; Figure 7 This is a schematic diagram of the structure of the threaded rod provided in an embodiment of the present invention; Figure 8 This is a schematic diagram of the structure where the fixed insertion post and the movable insertion post are separated, provided in an embodiment of the present invention; Figure 9 This is a schematic diagram of the structure of the arc-shaped grinding block provided in an embodiment of the present invention; Figure 10 This is a schematic diagram of the structure where the plug rod and threaded block are separated, provided in an embodiment of the present invention; Figure 11 This is a schematic diagram of the structure where the lifting frame and the arc-shaped grinding block are separated, as provided in an embodiment of the present invention. Figure 12 This is a schematic diagram of the structure of the fifth spring provided in an embodiment of the present invention.

[0015] In the diagram: 1. Grinding table; 2. Air pump; 3. Placement slot; 4. Fixed support plate; 5. Lifting plate; 6. Lifting cover; 7. Drive motor; 8. Grinding mechanism; 81. Reversing assembly; 811. First gear; 812. First half gear; 813. Second gear; 814. Second half gear; 815. Third gear; 82. Fourth gear; 83. Transmission belt; 84. First bevel gear; 85. Second bevel gear; 86. Threaded rod; 87. Threaded block; 88. Moving block; 89. Arc-shaped grinding block; 810. 9. Limiting block; 91. Automatic adjustment mechanism; 92. Third bevel gear; 93. Fixed insert; 94. Movable insert; 95. Fourth bevel gear; 96. Second spring; 97. First inclined sliding surface; 98. Second inclined sliding surface; 99. Insertion rod; 10. Third spring; 11. Fixed sleeve rod; 12. Movable insert rod; 13. First spring; 14. Edge polishing mechanism; 15. Extrusion fixing plate; 16. Lifting frame; 17. Sliding block; 18. Fourth spring; 19. Grinding frame; 10. Fifth spring. Detailed Implementation

[0016] To make the technical means, creative features, objectives, and effects of this invention readily understandable, the invention is further described below with reference to specific illustrations. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0017] Please see Figure 1 - Figure 12 This invention provides a technical solution: a positioning and fixing structure for grinding rounded corners of an arc surface in plastic processing, including a grinding table 1 and an air pump 2 set at the top of the grinding table 1. The upper surface of the lower end of the grinding table 1 is provided with a placement slot 3. A fixed support plate 4 is fixedly connected to the bottom of the inner cavity of the placement slot 3. A lifting plate 5 is fixedly connected to the bottom of the air pump 2, and a lifting cover 6 is fixedly connected to the bottom of the lifting plate 5. A drive motor 7 is fixedly connected to the upper end of the lifting cover 6. A grinding mechanism 8 is provided in the inner cavity of the lifting cover 6. A fixed sleeve rod 10 is fixedly connected to the top of the inner cavity of the lifting cover 6. A movable insert rod 11 is inserted vertically at the bottom of the fixed sleeve rod 10. A first spring 12 is fixedly connected between the top of the movable insert rod 11 and the fixed sleeve rod 10. An automatic adjustment mechanism 9 is provided at each of the four corners inside the lifting cover 6. An edge polishing mechanism 13 is provided on the grinding mechanism 8. The grinding mechanism 8 includes a reversing component 81 located at the center of the upper end of the lifting cover 6. The reversing component 81 includes a first gear 811 rotatably disposed inside the top of the lifting cover 6. The upper end of the first gear 811 is fixed to the output end of the drive motor 7. A first half gear 812 is coaxially disposed on the lower side of the first gear 811. A second gear 813 is meshed with one side of the first gear 811. A second half gear 814 is coaxially disposed on the lower side of the second gear 813. A third gear 815 is rotatably disposed on one side of the second half gear 814 and the first half gear 812 within the lifting cover 6. A fourth gear 82 is coaxially disposed on the lower side of the third gear 815. Fourth gears 82 are meshed with all four sides of the fourth gear 82. A first bevel gear 84 is disposed on one side of the fourth gear 82 on the periphery. A transmission belt 83 connects the central axis of the fourth gear 82 on the periphery and the central axis of the first bevel gear 84. A second bevel gear 84 is rotatably disposed on one side of the first bevel gear 84 within the lifting cover 6. 5. The second bevel gear 85 and the first bevel gear 84 are connected by an automatic adjustment mechanism 9. A threaded rod 86 is fixedly connected to the center of the bottom end of the second bevel gear 85. Threaded blocks 87 are threadedly connected to the outer walls of the upper and lower ends of the threaded rod 86. A limit block 810 is fixedly connected to the end of the threaded block 87 near the inner wall of the lifting cover 6. The end of the limit block 810 away from the threaded block 87 abuts against the inner wall of the lifting cover 6. A moving block 88 is provided on the side of the threaded block 87 away from the limit block 810. Arc-shaped grinding blocks 89 are fixedly connected to the opposite ends of the upper and lower moving blocks 88. The outer teeth of the second half gear 814 and the first half gear 812 are both provided with half a circle. The first half gear 812 and the second half gear 814 are distributed vertically. The third gear 815 meshes with the second half gear 814 or the first half gear 812. The outer teeth of the first half gear 812 and the second half gear 814 are symmetrically arranged. The external threads on the outer walls of the upper and lower ends of the threaded rod 86 are in opposite directions. The threaded rod 86 is located at the four corners of the inner cavity of the lifting cover 6.

[0018] Specifically, starting the drive motor 7 causes it to rotate the first gear 811. Through the transmission of the first gear 811, the second gear 813, the first half gear 812, the second half gear 814, and the third gear 815, the first half gear 812 and the second half gear 814 can mesh with the third gear 815 in sequence. Since the first half gear 812 and the second half gear 814 rotate in opposite directions, the third gear 815 can rotate periodically in both directions. Through the third gear 815, the fourth gear 82, the transmission belt 83, the first bevel gear 84, and the third bevel gear... The transmission of wheel 91, fixed insert 92, movable insert 93, fourth bevel gear 94, second bevel gear 85, threaded rod 86 and threaded block 87 enables the threaded block 87 to move up and down periodically. Since the external threads on the outer walls of the upper and lower ends of the threaded rod 86 are in opposite directions, the upper and lower threaded blocks 87 move towards or away from each other. This ensures that the force on the plastic sheet is balanced when it is squeezed, preventing the plastic sheet from moving. When the threaded block 87 moves up and down, the arc-shaped grinding block 89 on the moving block 88 will grind the rounded corners at the four corners of the plastic sheet.

[0019] In another embodiment of the present invention, the automatic adjustment mechanism 9 includes a third bevel gear 91 meshing with a first bevel gear 84. A fixed pin 92 is fixedly connected to one end of the third bevel gear 91 away from the first bevel gear 84. A movable pin 93 is movably inserted into one end of the fixed pin 92 away from the third bevel gear 91. A second spring 95 is fixedly connected between one end of the movable pin 93 located inside the fixed pin 92 and the fixed pin 92. A fourth bevel gear 94 is fixedly connected to one end of the movable pin 93 away from the fixed pin 92. The fourth bevel gear 94 is meshed with the second bevel gear 85. A plug rod 98 is fixedly connected to one side wall of the moving block 88 near the threaded block 87. The other end of the plug rod 98 is movably inserted into the threaded block 87. A third spring 99 is fixedly connected between the end of the plug rod 98 located inside the threaded block 87 and the threaded block 87. The upper and lower ends of the threaded block 87 are provided with first inclined sliding surfaces 96. The upper and lower sides of the end of the moving block 88 away from the threaded block 87 are provided with second inclined sliding surfaces 97. The upper and lower ends of the moving block 88 are provided with first inclined sliding surfaces 96.

[0020] Specifically, before using the device, the plastic plate is placed on the upper surface of the fixed support plate 4. Then, the air pump 2 is started, causing the air pump 2 to drive the lifting plate 5 and the lifting cover 6 to move downward. Then, the bottom end of the movable insert rod 11 presses against the upper surface of the plastic plate, fixing the plastic plate. As the lifting cover 6 continues to move downward, due to the pressure from the side of the plastic plate, the threaded block 87 and the moving block 88 located on the bottom side move away from the plastic plate, causing the movable insert 93 to compress into the fixed insert 92. Then, the plastic plate moves to the middle of the upper and lower moving blocks 88. Due to the setting of the second inclined sliding surface 97, the side of the plastic plate presses the moving block 88 against the threaded block 87. Then, the plastic plate is located between the upper and lower grinding frames 135, so that it can accommodate plastic plates of different lengths and widths, and the arc-shaped grinding block 89 abuts against the rounded corners of the plastic plate.

[0021] In another embodiment of the present invention, a square groove is provided on the side wall of the arc-shaped grinding block 89 away from the threaded block 87. A pressing fixing plate 131 is fixedly connected to the bottom end of the inner cavity of the square groove. A lifting frame 132 is provided on the upper side of the pressing fixing plate 131 inside the arc-shaped grinding block 89. The lifting frame 132 is slidably disposed inside the arc-shaped grinding block 89. A fourth spring 134 is fixedly connected between the bottom end of the lifting frame 132 and the arc-shaped grinding block 89. A sliding block 133 is slidably disposed at the bottom end of the lifting frame 132. A fifth spring 136 is fixedly connected between the upper side wall of the sliding block 133 and the lifting frame 132. A grinding frame 135 is fixedly connected to the end of the sliding block 133 away from the arc-shaped grinding block 89. Both the bottom end of the sliding block 133 and the upper end of the pressing fixing plate 131 are provided with mutually parallel inclined surfaces.

[0022] Specifically, after the moving block 88 moves, the plastic plate will press against the grinding frame 135. Under the pressure of the pressing fixed plate 131, the grinding frame 135 slides to the other end of the lifting frame 132. Then, the arc-shaped grinding block 89 moves in the opposite direction, and the grinding frame 135 moves back to its original position, so that the grinding frame 135 can grind the edges of the plastic plate's rounded corners and the intersection of the upper and lower planes, further improving the grinding effect at the rounded corners of the plastic plate and preventing excess burrs. After grinding is completed, the drive motor 7 is turned off, and the air pump 2... The lifting cover 6 is moved upward. The inner arc surface of the arc-shaped grinding block 89 is larger than the arc surface at the rounded corner of the plastic plate. When the lifting cover 6 moves upward, the plastic plate is kept in place due to the squeezing of the movable rod 11. When the grinding frame 135 on the bottom side is squeezed by the plastic plate, the grinding frame 135 will slide to the other end of the lifting frame 132. At this time, the contact area between the grinding frame 135 and the plastic plate is zero. Then the lifting cover 6 continues to move upward, so that the plastic plate squeezes the moving block 88. After that, the plastic plate separates from the lifting cover 6, and the grinding is completed.

[0023] Working principle: Before using the device, place the plastic plate on the upper surface of the fixed support plate 4. Then, start the air pump 2, which drives the lifting plate 5 and the lifting cover 6 to move downwards. This causes the bottom end of the movable rod 11 to press against the upper surface of the plastic plate, fixing the plastic plate in place. As the lifting cover 6 continues to move downwards, the threaded block 87 and the moving block 88 on the bottom side move away from the plastic plate due to the pressure from the side of the plastic plate. This causes the movable pin 93 to compress into the fixed pin 92. The plastic plate then moves to the middle of the two moving blocks 88. Due to the second inclined sliding surface 97, the side of the plastic plate presses the moving block 88 against the threaded block 87. The plastic plate is then positioned between the two grinding frames 135, allowing it to adapt to different... A long and wide plastic sheet is placed, with the arc-shaped grinding block 89 pressed against the rounded corner of the plastic sheet. Then, the air pump 2 is turned off, and the drive motor 7 is started, causing the drive motor 7 to drive the first gear 811 to rotate. Through the transmission of the first gear 811, the second gear 813, the first half gear 812, the second half gear 814, and the third gear 815, the first half gear 812 and the second half gear 814 can mesh with the third gear 815 in sequence. Since the first half gear 812 and the second half gear 814 rotate in opposite directions, the third gear 815 can rotate periodically in both directions. Through the third gear 815, the fourth gear 82, the transmission belt 83, the first bevel gear 84, the third bevel gear 91, the fixed insert 92, the movable insert 93, the fourth bevel gear 94, and the third gear 815, the transmission motor 7 drives the first gear 811 to rotate. The transmission of the two bevel gears 85, the threaded rod 86, and the threaded block 87 allows the threaded block 87 to move up and down periodically. Because the external threads on the upper and lower outer walls of the threaded rod 86 are in opposite directions, the two threaded blocks 87 move towards or away from each other. This ensures that the forces acting on the plastic sheet are balanced when it is being compressed, preventing the plastic sheet from shifting. When the threaded block 87 moves up and down, the arc-shaped grinding block 89 on the moving block 88 grinds the rounded corners of the plastic sheet. After the moving block 88 moves, the plastic sheet presses against the grinding frame 135. Under the pressure of the pressing fixed plate 131, the grinding frame 135 slides to the other end of the lifting frame 132. Then, the arc-shaped grinding block 89 moves in the opposite direction, and the grinding frame 135 moves back to its original position. The position allows the grinding frame 135 to grind the edges where the rounded corners and upper and lower planes of the plastic sheet intersect, further improving the grinding effect at the rounded corners of the plastic sheet and preventing excess burrs. After grinding is completed, the drive motor 7 is turned off, and the lifting cover 6 is moved upward by the air pump 2. The inner arc surface of the arc-shaped grinding block 89 is larger than the arc surface at the rounded corner of the plastic sheet. When the lifting cover 6 moves upward, the plastic sheet is kept in place due to the squeezing of the movable insert rod 11. When the grinding frame 135 on the bottom side is squeezed by the plastic sheet, the grinding frame 135 will slide to the other end of the lifting frame 132. At this time, the contact area between the grinding frame 135 and the plastic sheet is zero. Then the lifting cover 6 continues to move upward, causing the plastic sheet to squeeze the moving block 88. After that, the plastic sheet separates from the lifting cover 6, completing the grinding.

[0024] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A positioning and fixing structure for grinding rounded corners of arc-shaped surfaces in plastic processing, comprising a grinding table (1) and an air pump (2) disposed at the top of the grinding table (1), characterized in that: The grinding table (1) has a placement slot (3) on its lower upper surface. A fixed support plate (4) is fixedly connected to the bottom of the inner cavity of the placement slot (3). A lifting plate (5) is fixedly connected to the bottom of the air pump (2), and a lifting cover (6) is fixedly connected to the bottom of the lifting plate (5). A drive motor (7) is fixedly connected to the upper end of the lifting cover (6). A grinding mechanism (8) is provided in the inner cavity of the lifting cover (6). A fixed sleeve rod (10) is fixedly connected to the top of the inner cavity of the lifting cover (6). A movable insert rod (11) is inserted vertically at the bottom of the fixed sleeve rod (10). A first spring (12) is fixedly connected between the top of the movable insert rod (11) and the fixed sleeve rod (10). An automatic adjustment mechanism (9) is provided at each of the four corners inside the lifting cover (6). An edge polishing mechanism (13) is provided on the grinding mechanism (8). The polishing mechanism (8) includes a reversing component (81) located at the center of the upper end of the lifting cover (6). The reversing component (81) includes a first gear (811) rotatably disposed inside the top of the lifting cover (6). The upper end of the first gear (811) is fixed to the output end of the drive motor (7). A first half gear (812) is coaxially disposed on the lower side of the first gear (811). A second gear (813) is meshed with one side of the first gear (811). A second half gear (814) is coaxially disposed on the lower side of the second gear (813). A third gear (815) is rotatably disposed on one side of the second half gear (814) and the first half gear (812) inside the lifting cover (6). A fourth gear (82) is coaxially disposed on the lower side of the third gear (815). A fourth gear (82) is meshed with four gears (82) on all four sides of the fourth gear (82). A fourth gear (82) is located on one side of the fourth gear (82) on the periphery. The first bevel gear (84) is connected to the central shaft of the fourth gear (82) located on the periphery by a transmission belt (83). A second bevel gear (85) is rotatably arranged inside the lifting cover (6) on one side of the first bevel gear (84). The second bevel gear (85) and the first bevel gear (84) are connected by an automatic adjustment mechanism (9). A threaded rod (86) is fixedly connected to the center of the bottom end of the second bevel gear (85). Threaded blocks (87) are threadedly connected to the outer walls of the upper and lower ends of the threaded rod (86). A limit block (810) is fixedly connected to one end of the threaded block (87) near the inner wall of the lifting cover (6). The end of the limit block (810) away from the threaded block (87) abuts against the inner wall of the lifting cover (6). A moving block (88) is provided on the side of the threaded block (87) away from the limit block (810). An arc-shaped grinding block (89) is fixedly connected to the opposite ends of the two moving blocks (88).

2. The arc-shaped surface grinding and rounded corner positioning and fixing structure for plastic processing according to claim 1, characterized in that: The automatic adjustment mechanism (9) includes a third bevel gear (91) meshing with a first bevel gear (84). A fixed pin (92) is fixedly connected to one end of the third bevel gear (91) away from the first bevel gear (84). A movable pin (93) is movably inserted into one end of the fixed pin (92) away from the third bevel gear (91). A second spring (95) is fixedly connected between the movable pin (93) inside the fixed pin (92) and the fixed pin (92). A fourth bevel gear (94) is fixedly connected to one end of the movable pin (93) away from the fixed pin (92). The fourth bevel gear (94) is meshed with the second bevel gear (85). The moving block (88) is fixedly connected to a plug rod (98) on one side wall near the threaded block (87). The other end of the plug rod (98) is movably inserted into the threaded block (87). A third spring (99) is fixedly connected between the end of the plug rod (98) located in the threaded block (87) and the threaded block (87). The upper and lower ends of the threaded block (87) are provided with a first inclined sliding surface (96). The upper and lower sides of the moving block (88) away from the threaded block (87) are provided with a second inclined sliding surface (97).

3. The arc-shaped surface grinding and rounded corner positioning and fixing structure for plastic processing according to claim 1, characterized in that: The arc-shaped grinding block (89) has a square groove on one side wall away from the threaded block (87). A pressing fixing plate (131) is fixedly connected to the bottom of the square groove. A lifting frame (132) is provided on the upper side of the pressing fixing plate (131) inside the arc-shaped grinding block (89). The lifting frame (132) is slidably arranged inside the arc-shaped grinding block (89). A fourth spring (134) is fixedly connected between the bottom end of the lifting frame (132) and the arc-shaped grinding block (89). A sliding block (133) is slidably arranged at the bottom end of the lifting frame (132). A fifth spring (136) is fixedly connected between the upper side wall of the sliding block (133) and the lifting frame (132). A grinding frame (135) is fixedly connected to the end of the sliding block (133) away from the arc-shaped grinding block (89).

4. The arc-shaped surface grinding and rounded corner positioning and fixing structure for plastic processing according to claim 1, characterized in that: The second half gear (814) and the first half gear (812) each have a half-circle of external teeth. The first half gear (812) and the second half gear (814) are distributed vertically. The third gear (815) meshes with the second half gear (814) or the first half gear (812). The external teeth of the first half gear (812) and the second half gear (814) are symmetrically arranged.

5. The arc-shaped surface grinding and rounded corner positioning and fixing structure for plastic processing according to claim 1, characterized in that: The external threads on the upper and lower outer walls of the threaded rod (86) are in opposite directions.

6. The arc-shaped surface grinding and rounded corner positioning and fixing structure for plastic processing according to claim 1, characterized in that: The threaded rod (86) is located at the four corners of the inner cavity of the lifting cover (6).

7. The arc-shaped surface grinding and rounded corner positioning and fixing structure for plastic processing according to claim 2, characterized in that: The moving block (88) has a first inclined sliding surface (96) at both the upper and lower ends.

8. The arc-shaped surface grinding and rounded corner positioning and fixing structure for plastic processing according to claim 3, characterized in that: The bottom end of the sliding block (133) and the top end of the pressing and fixing plate (131) are both provided with mutually parallel inclined surfaces.

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