A plastic product bending device and bending process

Abstract

The present invention relates to the technical field of plastic processing, and particularly relates to a plastic product bending device and a bending process. The device includes a support plate. A clamping component is installed on the upper part of one side of the support plate, and a lifting cylinder is installed on the lower part of one side of the support plate. A first arc-shaped groove is formed on the other side of the support plate, and a heating column component is installed in the first arc-shaped groove. The heating column component includes a plurality of heating columns of different sizes, and the heating column component further includes a lifting component. A first driving component is installed on the lower part of the support plate, a bending component is installed on the heating column component, and a second driving component is also installed on the lower part of the support plate. By setting the heating column component as a plurality of heating columns of different sizes, different heating columns can be selected according to the usage requirements for bending, enabling the device to bend plastic plates into different arcs without the need to replace different bending devices, thereby improving the processing efficiency of plastic parts.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic processing, and in particular to a plastic product bending device and a bending process. Background Art

[0002] Plastic plates are plates made of plastic and are widely applicable to the construction and chemical industries. Since plastic plates are a kind of thermoplastic engineering plastic with excellent performance, some heating and bending devices for plastic plates are also constantly developing.

[0003] The Chinese utility model patent with the patent number CN202022464804.0 proposes a plastic plate heating and bending device, including a base. The bottom of the base is fixedly connected to the top of a support column, the outer surface of the bottom of the base is fixedly installed with the top of a heating power supply, the upper surface of the base is fixedly connected to the bottom of a plastic fixing base, the inner wall of the plastic fixing base is slidably connected to the outer surface of a slider through a chute, and the top of the slider is fixedly connected to the bottom of a clamping plate. For this plastic plate heating and bending device, the surface of a heating column and a heating resistor are heated by the heating power supply. After heating is completed, the handle is directly rotated and a bending block is used to directly bend the plastic plate, achieving the simultaneous performance of the two functions of heating and bending.

[0004] However, the bending arc of the plastic plate by this device is fixed. When different arcs need to be bent, different bending devices need to be replaced, which affects the processing efficiency of plastic parts. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to propose a plastic product bending device and a bending process to solve the problem that the bending arc of the plastic plate by the existing device is fixed. When different arcs need to be bent, different bending devices need to be replaced, which affects the processing efficiency of plastic parts.

[0006] Based on the above purpose, the present invention provides a plastic product bending device, including a support plate. A clamping assembly is installed on the upper part of one side of the support plate, a lifting cylinder for driving the clamping assembly to move up and down is installed on the lower part of one side of the support plate. A first arc-shaped groove is formed on the other side of the support plate, and a heating column assembly is slidably installed in the first arc-shaped groove. The heating column assembly includes a plurality of heating column bodies of different sizes, and the plurality of heating column bodies are sleeved in sequence from large to small. The heating column assembly further includes a lifting assembly for driving the heating column bodies to move upward. A first driving assembly for driving the heating column assembly to slide along the first arc-shaped groove is installed on the lower part of the support plate. A bending assembly is rotatably installed on the heating column assembly, and a second driving assembly for driving the bending assembly to rotate is further installed on the lower part of the support plate.

[0007] Optionally, the clamping assembly includes a first U-shaped frame. A first rotating shaft is installed at the lower part of the first U-shaped frame. The first rotating shaft is rotatably installed on the support plate and is connected to the output end of the lifting cylinder. Rotating motors are installed on both sides of the first U-shaped frame. The output end of the rotating motor is installed with a second U-shaped frame. A roller is rotatably installed on the second U-shaped frame. A pressing block is slidably installed along the length of the side surface of the second U-shaped frame. A spring is installed between the pressing block and the second U-shaped frame. A gradually changing convex block matched with the pressing block is arranged on the inner side surface of the first U-shaped frame. When the rotating motor drives the second U-shaped frame to rotate to the horizontal position, the gradually changing convex block makes one end of the pressing block protrude from the roller.

[0008] When conveying the plastic plate, the rotating motor drives the second U-shaped frame to be in a vertical state, and the two rollers convey the plastic plate. After the plastic plate is conveyed in place, the rotating motor drives the second U-shaped frame to rotate to the horizontal position. When rotating, one end of the pressing block contacts the gradually changing convex block. Under the action of the gradually changing convex block, the other end of the pressing block contacts the plastic plate and tightly clamps the plastic plate.

[0009] Optionally, pressing blocks are slidably installed on both side surfaces of the second U-shaped frame. The ends of the two pressing blocks are provided with inclined surfaces, and the inclination directions of the two inclined surfaces are opposite.

[0010] Optionally, the heating column assembly includes a support cylinder body. A first heating column body is sleeved on the upper part of the support cylinder body. A second heating column body is sleeved inside the first heating column body. A third heating column body is sleeved inside the second heating column body. Heating wires are installed inside the first heating column body, the second heating column body and the third heating column body. The lifting assembly is in transmission connection with the second heating column body and the third heating column body.

[0011] Optionally, the lifting assembly includes a first lifting cylinder and a second lifting cylinder. A first sliding groove and a second sliding groove are formed in the support cylinder body along its length direction. A first lifting block is slidably installed in the first sliding groove. A second sleeve is arranged at the lower part of the second heating column body. One end of the first lifting block is connected to the second sleeve, and the other end of the first lifting block is connected to the output end of the first lifting cylinder. A second lifting block is slidably installed in the second sliding groove. A third sleeve is arranged at the lower part of the third heating column body. One end of the second lifting block is connected to the third sleeve, and the other end of the second lifting block is connected to the output end of the second lifting cylinder.

[0012] Optionally, the first driving component includes a driving plate, one end of the driving plate is rotatably installed on the lower surface of the support plate, the other end of the driving plate is connected to the heating column assembly, a first gear is installed on the lower surface of the driving plate, a first motor is installed at the lower part of the support plate, and an output end of the first motor is installed with a second gear, and the second gear meshes with the first gear.

[0013] Optionally, the second driving component includes a lower support plate, the lower support plate is installed at the lower part of the support plate, two driving cylinders are installed vertically at the lower part of the lower support plate, an output end of the driving cylinder is installed with a lower lifting plate, a second motor is installed on the lower lifting plate, an output end of the second motor is installed with a driving shaft, several convex teeth are protruded from the upper end of the driving shaft, a third gear is rotatably installed at the upper part of the support plate, a fourth gear is installed on the bending component, a fifth gear is installed between the third gear and the fourth gear, the fifth gear meshes with the third gear and the fourth gear respectively, a second arc-shaped groove is formed on the support plate, a rotating shaft is installed in the middle of the fifth gear, the rotating shaft passes through the second arc-shaped groove and is connected to the middle of the support plate, a matching sleeve is installed at the upper part of the third gear, and several grooves matching with the convex teeth are formed on the inner wall of the matching sleeve.

[0014] Optionally, the bending component includes a rotating plate, one end of the rotating plate is rotatably installed on the heating column assembly, a sliding groove is formed on the rotating plate, a bending rod is slidably installed in the sliding groove, a horizontal pulling plate is installed at the lower end of the bending rod, a pulling cylinder is installed at the upper part of the rotating plate, and an output end of the pulling cylinder is connected to the horizontal pulling plate.

[0015] Based on the above embodiments, a bending process for plastic products is proposed, including the following steps:

[0016] The clamping component clamps the plastic product, and places the part of the plastic product to be bent between the heating column assembly and the bending component;

[0017] Select the heating column body to be used, the lifting component drives the corresponding heating column body to move upward, and at the same time the lifting cylinder drives the clamping component to move, so that the plastic product is located at the position of the heating column body to be used;

[0018] The first driving component drives the heating column assembly to rotate along the first arc-shaped groove to adjust the positions of the heating column assembly and the clamping component;

[0019] The second driving component drives the bending component to rotate along the heating column assembly to drive the plastic product to bend.

[0020] Optionally, when the first driving component drives the heating column component to rotate along the first arc-shaped groove, the driving cylinder drives the second motor to move upward, so that the convex teeth on the driving shaft are disengaged from the grooves on the mating sleeve.

[0021] Advantages of the present invention: By setting the heating column component as a plurality of heating columns of different sizes, different heating columns can be selected according to the usage needs for bending, enabling the device to bend plastic plates into different arcs without the need to replace different bending devices, thereby improving the processing efficiency of plastic parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only those of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 Schematic diagram of the plastic product bending device according to the embodiment of the present invention Figure 1 ;

[0024] Figure 2 Schematic diagram of the clamping component according to the embodiment of the present invention Figure 1 ;

[0025] Figure 3 Schematic diagram of the clamping component according to the embodiment of the present invention Figure 2 ;

[0026] Figure 4 Schematic diagram of the plastic product bending device according to the embodiment of the present invention Figure 2 ;

[0027] Figure 5 Schematic diagram of the heating column component according to the embodiment of the present invention;

[0028] Figure 6 Schematic diagram of the plastic product bending device according to the embodiment of the present invention Figure 3 ;

[0029] Figure 7 Schematic diagram of the bending component according to the embodiment of the present invention.

[0030] The labels in the figure are:

[0031] 1. Support plate; 2. Lifting cylinder; 3. First arc groove; 4. First U-shaped frame; 5. Rotary motor; 6. Second U-shaped frame; 7. Roller; 8. Tightening block; 9. Gradual convex block; 10. Support cylinder; 11. First heating cylinder; 12. Second heating cylinder; 13. Third heating cylinder; 14. First lifting cylinder; 15. Second lifting cylinder; 16. First sliding groove; 17. Second sliding groove; 18. First lifting block; 19. Second lifting block; 20. Driving plate; 21. First gear; 22. First motor; 23. Second gear; 24. Lower support plate; 25. Driving cylinder; 26. Lower lifting plate; 27. Second motor; 28. Driving shaft; 29. Third gear; 30. Fourth gear; 31. Fifth gear; 32. Second arc groove; 33. Matching sleeve; 34. Rotating plate; 35. Sliding groove; 36. Bent rod; 37. Horizontal pull plate; 38. Pulling cylinder. Detailed implementation manner

[0032] In order to make the purpose, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with specific embodiments.

[0033] It should be noted that unless otherwise defined, the technical terms or scientific terms used in the present invention should have the ordinary meaning understood by those with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar terms used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. The terms such as "including" or "comprising" mean that the elements or objects appearing before the term cover the elements or objects listed after the term and their equivalents, without excluding other elements or objects. The terms such as "connected" or "linked" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms such as "upper", "lower", "left", "right" are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0034] A plastic product bending device, such as Figure 1 , Figure 4 and Figure 6As shown in the figure, it includes a support plate 1. A clamping assembly is installed at the upper part of one side of the support plate 1, and a lifting cylinder 2 for driving the clamping assembly to move up and down is installed at the lower part of one side of the support plate 1. A first arc-shaped groove 3 is formed on the other side of the support plate 1, and a heating column assembly is slidably installed in the first arc-shaped groove 3. The heating column assembly includes a number of heating columns of different sizes, and the number of heating columns are sleeved in sequence from large to small. The heating column assembly further includes a lifting assembly for driving the heating columns to move upward. A first driving assembly for driving the heating column assembly to slide along the first arc-shaped groove 3 is installed at the lower part of the support plate 1. A bending assembly is rotatably installed on the heating column assembly, and a second driving assembly for driving the bending assembly to rotate is also installed at the lower part of the support plate 1.

[0035] In the present invention, by setting the heating column assembly as a number of heating columns of different sizes, different heating columns can be selected according to the use requirements for bending, enabling the device to bend plastic plates into different arcs without the need to replace different bending devices, thus improving the processing efficiency of plastic parts.

[0036] In one embodiment, as Figure 2 and Figure 3 shown in the figure, the clamping assembly includes a first U-shaped frame 4. A first rotating shaft is installed at the lower part of the first U-shaped frame 4. The first rotating shaft is rotatably installed on the support plate 1 and is connected to the output end of the lifting cylinder 2. By driving the first rotating shaft to move up and down through the lifting cylinder 2, the position of the first U-shaped frame 4 is adjusted. Rotary motors 5 are installed on both sides of the first U-shaped frame 4. A second U-shaped frame 6 is installed at the output end of the rotary motor 5. A roller 7 is rotatably installed on the second U-shaped frame 6. A tightening block 8 is slidably installed along the length of the side surface of the second U-shaped frame 6. A spring (not shown) is installed between the tightening block 8 and the second U-shaped frame 6. A gradually changing convex block 9 that cooperates with the tightening block 8 is provided on the inner side surface of the first U-shaped frame 4. When the rotary motor 5 drives the second U-shaped frame 6 to rotate to the horizontal position, the gradually changing convex block 9 causes one end of the tightening block 8 to protrude from the roller 7.

[0037] When transporting the plastic plate, the rotary motor 5 drives the second U-shaped frame 6 to be in a vertical state, and the two rollers 7 transport the plastic plate. When the plastic plate is transported in place, the rotary motor 5 drives the second U-shaped frame 6 to rotate to the horizontal position. During rotation, one end of the tightening block 8 comes into contact with the gradually changing convex block 9. Under the action of the gradually changing convex block 9, the other end of the tightening block 8 comes into contact with the plastic plate and tightly clamps the plastic plate.

[0038] In one embodiment, the two sides of the second U-shaped frame 6 are slidably mounted with a clamping block 8, and the ends of the two clamping blocks 8 are both provided with an inclined surface, and the inclined directions of the two inclined surfaces are opposite. The inclined surfaces are attached with rubber to prevent the plastic plate from being scratched when the plastic plate is clamped.

[0039] In one embodiment, Figure 5 As shown, the heating column assembly includes a supporting cylinder 10, a first heating column 11 is mounted on the upper portion of the supporting cylinder 10, a second heating column 12 is mounted inside the first heating column 11, a third heating column 13 is mounted inside the second heating column 12, heating wires are installed inside the first heating column 11, the second heating column 12 and the third heating column 13, the heating wires are connected to an external power supply, and the external power supply controls the on and off of the heating wires, and the lifting assembly is transmission-connected to the second heating column 12 and the third heating column 13.

[0040] In one embodiment, the lifting assembly includes a first lifting cylinder 14 and a second lifting cylinder 15, and the support cylinder 10 is provided with a first slide groove 16 and a second slide groove 17 along its length direction, and a first lifting block 18 is slidably installed in the first slide groove 16, and a second sleeve is provided at the lower portion of the second heating column 12, one end of the first lifting block 18 is connected to the second sleeve, and the other end of the first lifting block 18 is connected to the output end of the first lifting cylinder 14, and a second lifting block 19 is slidably installed in the second slide groove 17, and a third sleeve is provided at the lower portion of the third heating column 13, one end of the second lifting block 19 is connected to the third sleeve, and the other end of the second lifting block 19 is connected to the output end of the second lifting cylinder 15.

[0041] When the second heating column 12 needs to be extended, the first lifting cylinder 14 drives the first lifting block 18 to move upward, and the first lifting block 18 drives the second heating column 12 to move upward through the second sleeve. When the third heating column 13 needs to be extended, the second lifting cylinder 15 drives the second lifting block 19 to move upward, and the second lifting block 19 drives the third heating column 13 to move upward through the third sleeve.

[0042] In one embodiment, the first driving assembly includes a driving plate 20. One end of the driving plate 20 is rotatably installed on the lower surface of the support plate 1. The other end of the driving plate 20 is connected to the heating column assembly. A first gear 21 is installed on the lower surface of the driving plate 20. A first motor 22 is installed at the lower part of the support plate 1. The output end of the first motor 22 is installed with a second gear 23. The second gear 23 meshes with the first gear 21. During use, the first motor 22 drives the first gear 21 to rotate through the second gear 23. The first gear 21 drives the driving plate 20 to rotate, and further drives the heating column assembly to rotate along the first arc-shaped groove 3.

[0043] In one embodiment, the second driving assembly includes a lower support plate 24. The lower support plate 24 is installed at the lower part of the support plate 1. Two driving cylinders 25 are installed vertically at the lower part of the lower support plate 24. The output end of the driving cylinder 25 is installed with a lower lifting plate 26. A second motor 27 is installed on the lower lifting plate 26. The output end of the second motor 27 is installed with a driving shaft 28. A plurality of convex teeth are protruded on the upper end of the driving shaft 28. The upper part of the support plate 1 is rotatably installed with a third gear 29. A fourth gear 30 is installed on the bending assembly. A fifth gear 31 is installed between the third gear 29 and the fourth gear 30. The fifth gear 31 meshes with the third gear 29 and the fourth gear 30 respectively. A second arc-shaped groove 32 is formed on the support plate 1. A rotating shaft is installed in the middle of the fifth gear 31. The rotating shaft passes through the second arc-shaped groove 32 and is connected to the middle of the support plate 1. A matching sleeve 33 is installed on the upper part of the third gear 29. A plurality of grooves matching with the convex teeth are formed on the inner wall of the matching sleeve 33.

[0044] During use, the driving cylinder 25 drives the second motor 27 to move downwards. The second motor 27 drives the driving shaft 28 to move downwards, so that the convex teeth are matched with the grooves. The second motor 27 rotates, drives the driving shaft 28 to rotate, and further drives the third gear 29 to rotate. The third gear 29 drives the fifth gear 31 to rotate. The fifth gear 31 drives the fourth gear 30 to rotate, and further drives the bending assembly to rotate.

[0045] In one embodiment, as Figure 7 shown, the bending assembly includes a rotating plate 34. One end of the rotating plate 34 is rotatably installed on the heating column assembly. A sliding groove 35 is formed on the rotating plate 34. A bending rod 36 is slidably installed in the sliding groove 35. A horizontal pulling plate 37 is installed at the lower end of the bending rod 36. A pulling cylinder 38 is installed on the upper part of the rotating plate 34. The output end of the pulling cylinder 38 is connected to the horizontal pulling plate 37.

[0046] Among them, the pulling cylinder 38 drives the horizontal pulling plate 37 to move, and the horizontal pulling plate 37 drives the bending rod 36 to move along the sliding groove 35 to adjust the position of the bending rod 36 and the heating column assembly.

[0047] Based on the above embodiments, a bending process for plastic products is proposed, including the following steps:

[0048] The clamping assembly clamps the plastic product and places the part of the plastic product to be bent between the heating column assembly and the bending assembly;

[0049] Select the heating column body to be used, and the lifting assembly drives the corresponding heating column body to move upward. At the same time, the lifting cylinder 2 drives the clamping assembly to move so that the plastic product is located at the position of the heating column body to be used;

[0050] The first driving assembly drives the heating column assembly to rotate along the first arc groove 3 to adjust the position of the heating column assembly and the clamping assembly;

[0051] The second driving assembly drives the bending assembly to rotate along the heating column assembly to drive the plastic product to bend.

[0052] Optionally, when the first driving assembly drives the heating column assembly to rotate along the first arc groove 3, the driving cylinder 25 drives the second motor 27 to move upward, so that the convex teeth on the driving shaft 28 are disengaged from the grooves on the mating sleeve 33.

[0053] In the present invention, by setting the heating column assembly as a plurality of heating column bodies of different sizes, different heating column bodies can be selected according to the use needs for bending, and the device can be used to bend plastic plates into different arcs without replacing different bending devices, improving the processing efficiency of plastic parts.

[0054] Those of ordinary skill in the art should understand that the discussion of any above embodiment is only exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; under the concept of the present invention, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations in different aspects of the present invention as described above, which are not provided in detail for the sake of brevity.

[0055] The present invention aims to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A plastic product bending device, comprising a support plate (1), characterized in that, A clamping assembly is installed at the upper part of one side of the support plate (1), a lifting cylinder (2) for driving the clamping assembly to move up and down is installed at the lower part of one side of the support plate (1), a first arc-shaped groove (3) is formed on the other side of the support plate (1), a heating column assembly is slidably installed in the first arc-shaped groove (3), the heating column assembly includes a plurality of heating columns of different sizes, the plurality of heating columns are sleeved in sequence from large to small, the heating column assembly further includes a lifting assembly for driving the heating columns to move upward, a first driving assembly for driving the heating column assembly to slide along the first arc-shaped groove (3) is installed at the lower part of the support plate (1), a bending assembly is rotatably installed on the heating column assembly, and a second driving assembly for driving the bending assembly to rotate is further installed at the lower part of the support plate (1); The heating column assembly includes a support cylinder body (10), a first heating column (11) is sleeved on the upper part of the support cylinder body (10), a second heating column (12) is sleeved inside the first heating column (11), a third heating column (13) is sleeved inside the second heating column (12), heating wires are installed inside the first heating column (11), the second heating column (12) and the third heating column (13), and the lifting assembly is in transmission connection with the second heating column (12) and the third heating column (13).

2. The plastic product bending device according to claim 1, wherein, The clamping assembly includes a first U-shaped frame (4), a first rotating shaft is installed at the lower part of the first U-shaped frame (4), the first rotating shaft is rotatably installed on the support plate (1) and is connected to the output end of the lifting cylinder (2), rotating motors (5) are installed on both sides of the first U-shaped frame (4), a second U-shaped frame (6) is installed at the output end of the rotating motor (5), rollers (7) are rotatably installed on the second U-shaped frame (6), a pressing block (8) is slidably installed along the length of the side surface of the second U-shaped frame (6), a spring is installed between the pressing block (8) and the second U-shaped frame (6), a gradually changing convex block (9) matched with the pressing block (8) is arranged on the inner side surface of the first U-shaped frame (4), and when the rotating motor (5) drives the second U-shaped frame (6) to rotate to the horizontal position, the gradually changing convex block (9) makes one end of the pressing block (8) protrude from the roller (7).

3. The plastic product bending device according to claim 2, characterized in that, Pressing blocks (8) are slidably installed on both side surfaces of the second U-shaped frame (6), inclined surfaces are arranged at the ends of the two pressing blocks (8), and the inclination directions of the two inclined surfaces are opposite.

4. The plastic product bending device according to claim 1, characterized in that, The lifting assembly includes a first lifting cylinder (14) and a second lifting cylinder (15). The support cylinder body (10) is provided with a first sliding groove (16) and a second sliding groove (17) along its length direction. A first lifting block (18) is slidably installed in the first sliding groove (16). A second sleeve is provided at the lower part of the second heating cylinder body (12). One end of the first lifting block (18) is connected to the second sleeve, and the other end of the first lifting block (18) is connected to the output end of the first lifting cylinder (14). A second lifting block (19) is slidably installed in the second sliding groove (17). A third sleeve is provided at the lower part of the third heating cylinder body (13). One end of the second lifting block (19) is connected to the third sleeve, and the other end of the second lifting block (19) is connected to the output end of the second lifting cylinder (15).

5. The plastic product bending device according to claim 1, characterized in that, The first driving assembly includes a driving plate (20). One end of the driving plate (20) is rotatably installed on the lower surface of the support plate (1), and the other end of the driving plate (20) is connected to the heating cylinder assembly. A first gear (21) is installed on the lower surface of the driving plate (20). A first motor (22) is installed at the lower part of the support plate (1), and a second gear (23) is installed at the output end of the first motor (22). The second gear (23) meshes with the first gear (21).

6. The plastic product bending device according to claim 1, characterized in that, The second driving assembly includes a lower support plate (24). The lower support plate (24) is installed at the lower part of the support plate (1). Two driving cylinders (25) are installed vertically at the lower part of the lower support plate (24). The output end of the driving cylinder (25) is installed with a lower lifting plate (26). A second motor (27) is installed on the lower lifting plate (26). The output end of the second motor (27) is installed with a driving shaft (28). A plurality of convex teeth are protruded at the upper end of the driving shaft (28). A third gear (29) is rotatably installed at the upper part of the support plate (1). A fourth gear (30) is installed on the bending assembly. A fifth gear (31) is installed between the third gear (29) and the fourth gear (30). The fifth gear (31) meshes with the third gear (29) and the fourth gear (30) respectively. A second arc-shaped groove (32) is formed on the support plate (1). A rotating shaft is installed in the middle of the fifth gear (31). The rotating shaft passes through the second arc-shaped groove (32) and is connected to the middle of the support plate (1). A matching sleeve (33) is installed at the upper part of the third gear (29). A plurality of grooves matching the convex teeth are formed on the inner wall of the matching sleeve (33).

7. The plastic product bending device according to claim 1, characterized in that, The bending assembly includes a rotating plate (34). One end of the rotating plate (34) is rotatably installed on the heating column assembly. A sliding groove (35) is formed in the rotating plate (34). A bending rod (36) is slidably installed in the sliding groove (35). A horizontal pulling plate (37) is installed at the lower end of the bending rod (36). A pulling cylinder (38) is installed at the upper part of the rotating plate (34). The output end of the pulling cylinder (38) is connected to the horizontal pulling plate (37).

8. A bending process for the plastic product bending device according to claim 6, characterized in that, It includes the following steps: The clamping assembly clamps the plastic product and places the part of the plastic product to be bent between the heating column assembly and the bending assembly; Select the heating column body to be used. The lifting assembly drives the corresponding heating column body to move upward. At the same time, the lifting cylinder (2) drives the clamping assembly to move so that the plastic product is located at the position of the heating column body to be used; The first driving assembly drives the heating column assembly to rotate along the first arc-shaped groove (3) to adjust the positions of the heating column assembly and the clamping assembly; The second driving assembly drives the bending assembly to rotate along the heating column assembly to bend the plastic product.

9. The bending process according to claim 8, characterized in that, When the first driving assembly drives the heating column assembly to rotate along the first arc-shaped groove (3), the driving cylinder (25) drives the second motor (27) to move upward, so that the convex teeth on the driving shaft (28) are disengaged from the grooves on the mating sleeve (33).

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