Tensioning device for PP plastic sheet production line

Abstract

The utility model discloses a PP plastic sheet production line tension device which comprises a frame, a pressing and pulling guide roller mechanism, a partition plate clamping mechanism and a clamping auxiliary mechanism, and the pressing and pulling guide roller mechanism comprises a hydraulic cylinder, an installation sleeve, a pressing and pulling roller, a flow guide roller, a driving motor and a gear transmission set. The partition plate clamping mechanism comprises a clamping pipe, a clamping rod, a concave-convex groove, a moving frame, a rotating block, a stretching-in groove and a rotating groove, and the clamping auxiliary mechanism comprises a matching ring, a movable rod, a supporting spring, a jacking block, a jacking groove, a rotating sleeve, a gradient pushing block, a jacked slope block, a moving sleeve, a moving groove and a side moving groove. The tension of the pressing and pulling rollers on the plastic sheets can be accurately controlled, it is guaranteed that the tension of the sheets on a production line is uniform, stable movement of the plastic sheets on the production line is guaranteed through the arrangement of the flow guide rollers, the positions of the partition plates are fast and convenient to adjust through the design of the clamping rods and the clamping pipes, and the production flexibility is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of tensioning, and more specifically, it relates to a tensioning device for a PP plastic sheet production line. Background Art

[0002] A tensioning device for a PP plastic sheet production line is a key device specifically designed for the production process of PP (polypropylene) plastic sheets. This device is mainly used to control and adjust the tension of the sheet on the production line to ensure the production of high-quality PP plastic sheets with uniform thickness.

[0003] In the existing technology, firstly, some devices cannot accurately control the tension of the sheet, the movement path of the sheet on the production line is difficult to control, effective stretching of the sheet cannot be achieved, affecting product quality, the production line speed cannot be accurately controlled, and the pressure and speed cannot be adjusted according to sheets of different thicknesses and materials. Secondly, some devices cannot separate or adjust the width of the sheet as needed, it is difficult to quickly adjust and fix the position of the partition, precise positioning of the partition cannot be achieved, and each adjustment requires complex manual operations, reducing production efficiency. Finally, some devices are difficult to stably support the clamping system, which may cause impacts and vibrations during the clamping process, precise angle adjustment is difficult to achieve, multi-directional fine adjustment cannot be achieved, increasing the difficulty of maintenance and cleaning. Summary of the Utility Model

[0004] Aiming at the problems existing in the prior art, the utility model provides a tensioning device for a PP plastic sheet production line to solve the technical problems such as the inability to accurately control the tension of the sheet and the inability to separate or adjust the width of the sheet as needed mentioned in the background art.

[0005] To achieve the above object, the utility model provides the following technical solution: A tensioning device for a PP plastic sheet production line, comprising a frame, a pressing and pulling roller mechanism, a partition clamping mechanism, and a clamping auxiliary mechanism. The pressing and pulling roller mechanism includes a hydraulic cylinder, a mounting sleeve, a pressing and pulling roller, a guiding roller, a driving motor, and a gear transmission group. The mounting sleeve is arranged on the pressing and pulling roller, the hydraulic cylinders are installed on both sides of the frame, and the pushing end of the hydraulic cylinder is connected to the mounting sleeve. Two groups of guiding rollers are cooperatively installed on both sides of the frame, the gear transmission group connects the two groups of guiding rollers, and the driving motor is connected to the gear transmission group. The partition clamping mechanism includes a clamping pipe, a clamping rod, an uneven groove, a moving frame, a rotating block, an extending groove, and a rotating groove. The extending groove and the rotating groove are arranged on the inner wall of the clamping pipe, the rotating block is arranged on the side wall of the clamping rod, the rotating block first moves longitudinally in the moving groove, and then drives the rotating block to rotate and slide in the rotating groove, so that the clamping rod first vertically extends and then rotates and locks. The uneven groove is arranged on the side wall of the clamping rod, and the moving frame horizontally movably penetrates through the side wall of the clamping pipe.

[0006] The present utility model is further configured such that the clamping auxiliary mechanism includes a mating ring, a movable rod, a support spring, a top block, a top groove, a rotating sleeve, a slope pushing block, a slope receiving block, a movable sleeve, a moving groove and a side shifting groove. The mating ring is fixedly arranged on the side wall of the clamping pipe. The movable rod extends longitudinally and is movably arranged on the mating ring. The support spring is arranged between the top block at one end of the movable rod and the mating ring. The rotating sleeve rotates directionally on the outer wall of the clamping pipe. The top groove is arranged at the bottom of the rotating sleeve. The top block is successively pushed into the top groove to stably support the rotating sleeve while the rotating sleeve rotates. The movable sleeve longitudinally slides on the outer wall of the clamping pipe in cooperation. The slope pushing block is arranged on the top of the rotating sleeve. The slope receiving block is arranged at the bottom of the movable sleeve.

[0007] The present utility model is further configured such that the moving groove is arranged inside the movable sleeve, and the side shifting grooves are arranged on both sides inside the movable sleeve. Both sides of the moving frame are slidably guided in the side shifting grooves, so that the moving frame extends horizontally into the concave-convex groove. The bottom of the frame is provided with a bottom plate, and a support block is arranged on the side surface of the bottom plate. A flow guiding plate is arranged on the support block. The flow guiding plate and the limiting plate guide the flowing direction of the plastic sheet.

[0008] The present utility model is further configured such that limiting plates are arranged on both sides of the top end surface of the flow guiding plate, a movable partition plate is movably arranged at the middle position of the flow guiding plate, and a side plate is arranged on the side surface of the movable partition plate.

[0009] The present utility model is further configured such that a connecting plate is arranged at the bottom of the side wall of the clamping pipe, and the bottom of the connecting plate is connected with the top of the side plate in cooperation.

[0010] The present utility model is further configured such that clamping holes are formed in the movable partition plate, and multiple groups of clamping holes are provided. One end of the clamping rod is rotationally connected with the clamping hole in a limiting manner, and the other end of the clamping rod extends through the side plate and is quickly clamped with the clamping pipe in cooperation. By connecting different clamping holes with the clamping rod, the adjustment of the movable partition plate is realized.

[0011] The present utility model is further configured such that a bracket is arranged on the side surface of the bottom plate, a guiding sleeve is arranged on the top of the bracket, a guiding rod is arranged on one side of the top end surface of the pressing and pulling roller, and the guiding rod is slidably guided in the guiding sleeve in cooperation. The guiding sleeve and the guiding rod ensure the precise positioning of the pressing and pulling roller.

[0012] The present utility model is further configured such that a return spring is arranged on the top of the connecting plate, and the other end of the return spring is connected with the bottom of the movable sleeve in cooperation. The arrangement of the return spring facilitates the reset of the movable sleeve when the work is released.

[0013] Compared with the prior art, the present utility model provides a tensioning device for a PP plastic sheet production line, which has the following beneficial effects:

[0014] The utility model is provided with a pressing and pulling guide roller mechanism. The combined use of a hydraulic cylinder and a mounting sleeve can accurately control the pulling force of the pressing and pulling rollers on the plastic sheet, ensuring uniform tension of the sheet on the production line. The arrangement of the guide rollers ensures the stable movement of the plastic sheet on the production line, avoiding deviation and wrinkles. The cooperation of the driving motor and the gear transmission group realizes the efficient stretching of the plastic sheet, improving the production efficiency. Through the driving motor, the production line speed can be conveniently adjusted to meet different production requirements.

[0015] The utility model is provided with a partition clamping mechanism. The design of the clamping rod and the clamping pipe enables the rapid and convenient adjustment of the position of the partition, improving production flexibility. The design of the rotating block and the concave-convex groove realizes the precise positioning of the partition, ensuring the uniform separation of the sheet. The rotating locking function of the clamping rod ensures the stability of the partition during the operation of the production line. The transverse movement design of the moving frame makes the operation more convenient and reduces the labor intensity of the operator.

[0016] The utility model is provided with a clamping auxiliary mechanism. The design of the cooperation ring, the movable rod and the support spring provides stable support, reducing the vibration during the operation of the equipment. The design of the rotating sleeve and the top block realizes the precise rotation control of the clamping rod. The design of the movable sleeve and the movable groove makes the maintenance and cleaning work easier. Description of the Drawings

[0017] Figure 1 is a schematic structural diagram of the whole device of the utility model in the unused state;

[0018] Figure 2 is a schematic structural diagram of the pressing and pulling guide roller mechanism of the utility model;

[0019] Figure 3 is a schematic structural diagram of the installation method of the movable partition of the utility model;

[0020] Figure 4 is a schematic structural diagram of the partition clamping mechanism and the clamping auxiliary mechanism of the utility model;

[0021] Figure 5 is a schematic structural diagram of the initial fixing method of the partition clamping mechanism of the utility model;

[0022] Figure 6 is a schematic structural diagram of the interior of the partition clamping mechanism and the clamping auxiliary mechanism of the utility model.

[0023] In the figure: 1. Frame; 2. Hydraulic cylinder; 3. Mounting sleeve; 4. Pressing and pulling roller; 5. Deflecting roller; 6. Driving motor; 7. Gear transmission group; 8. Clamping pipe; 9. Clamping rod; 10. Concave-convex groove; 11. Moving frame; 12. Rotating block; 13. Insertion groove; 14. Rotating groove; 15. Fitting ring; 16. Movable rod; 17. Supporting spring; 18. Top block; 19. Top groove; 20. Rotating sleeve; 21. Slope pushing block; 22. Top slope receiving block; 23. Moving sleeve; 24. Moving groove; 25. Lateral movement groove; 26. Bottom plate; 27. Supporting block; 28. Deflecting plate; 29. Restricting plate; 30. Moving partition plate; 31. Lateral plate; 32. Connecting plate; 33. Clamping hole; 34. Bracket; 35. Guide sleeve; 36. Return spring; 37. Guide rod. Detailed implementation manner

[0024] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The following will refer to the accompanying drawings and combine with embodiments to detail the present invention.

[0025] It should be pointed out that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as those commonly understood by those of ordinary skill in the technical field to which this application belongs.

[0026] In the present invention, unless otherwise stated, the orientations such as "upper, lower" are usually in the directions shown in the drawings, or in the vertical, perpendicular or gravitational directions; similarly, for the convenience of understanding and description, "left, right" are usually in the left and right shown in the drawings; "inner, outer" refer to the inner and outer relative to the contours of each component itself, but the above orientation terms are not used to limit the present invention.

[0027] Please refer to Figure 1-6, A tensioning device for a PP plastic sheet production line, comprising a frame 1, a pressing and pulling roller mechanism, a partition clamping mechanism and a clamping auxiliary mechanism. The pressing and pulling roller mechanism includes a hydraulic cylinder 2, a mounting sleeve 3, a pressing and pulling roller 4, a diversion roller 5, a driving motor 6 and a gear transmission group 7. The mounting sleeve 3 is arranged on the pressing and pulling roller 4. The hydraulic cylinder 2 is installed on both sides of the frame 1, and the pushing end of the hydraulic cylinder 2 is connected to the mounting sleeve 3. Two groups of diversion rollers 5 are cooperatively installed on both sides of the frame 1. The gear transmission group 7 connects the two groups of diversion rollers 5, and the driving motor 6 is connected to the gear transmission group 7. The partition clamping mechanism includes a clamping pipe 8, a clamping rod 9, an uneven groove 10, a moving frame 11, a rotating block 12, an insertion groove 13 and a rotating groove 14. The insertion groove 13 and the rotating groove 14 are arranged on the inner wall of the clamping pipe 8. The rotating block 12 is arranged on the side wall of the clamping rod 9. The rotating block 12 first moves longitudinally in the moving groove 24, and then drives the rotating block 12 to rotate and slide in the rotating groove 14, so that the clamping rod 9 first vertically extends and then rotates and locks. The uneven groove 10 is arranged on the side wall of the clamping rod 9. The moving frame 11 horizontally movably penetrates through the side wall of the clamping pipe 8.

[0028] In this embodiment, the plastic is placed between the pressing and pulling roller 4 and the diversion roller 5. The hydraulic cylinder 2 pushes the mounting sleeve 3, thereby adjusting the position of the pressing and pulling roller 4. The driving motor 6 is started, and the two groups of diversion rollers 5 are driven to rotate through the gear transmission group 7. The pressing and pulling roller 4 and the diversion roller 5 act together to stretch and guide the plastic sheet, realizing the quick installation and disassembly of the moving partition 30 on the diversion plate 28. By controlling the position of the moving partition 30, it is convenient to divert plastics of different widths. At this time, the clamping rod 9 longitudinally moves in the insertion groove 13 through the rotating block 12, and the rotating block 12 enters the rotating groove 14, driving the clamping rod 9 to rotate, so that the clamping rod 9 is initially fixed in the clamping pipe 8. After the clamping rod 9 rotates, the uneven groove 10 is made to cooperate with the moving frame 11 by means of the clamping auxiliary mechanism, and the moving frame 11 horizontally moves and passes through the side wall of the clamping pipe 8 to realize the clamping and re-fixing.

[0029] The clamping auxiliary mechanism includes a mating ring 15, a movable rod 16, a support spring 17, a top block 18, a top groove 19, a rotating sleeve 20, a slope pushing block 21, a top slope receiving block 22, a movable sleeve 23, a moving groove 24 and a side shift groove 25. The mating ring 15 is fixedly arranged on the side wall of the clamping pipe 8. The movable rod 16 longitudinally extends and is movably arranged on the mating ring 15. The support spring 17 is arranged between the top block 18 at one end of the movable rod 16 and the mating ring 15. The rotating sleeve 20 rotates directionally on the outer wall of the clamping pipe 8. The top groove 19 is arranged at the bottom of the rotating sleeve 20. The top block 18 is successively pushed into the top groove 19, so that while the rotating sleeve 20 rotates, it obtains stable support. The movable sleeve 23 longitudinally slides in cooperation on the outer wall of the clamping pipe 8. The slope pushing block 21 is arranged on the top of the rotating sleeve 20, and the top slope receiving block 22 is arranged at the bottom of the movable sleeve 23.

[0030] In this embodiment, the movable rod 16 moves longitudinally on the mating ring 15, compressing the support spring 17. While the rotating sleeve 20 rotates, the top block 18 is successively pushed into the top groove 19 at the bottom of the rotating sleeve 20 to cooperate with the stable support for rotation. When the rotating sleeve 20 rotates, the slope push block 21 pushes the top slope block 22 on the movable sleeve 23, causing the movable sleeve 23 to slide longitudinally on the outer wall of the clamping pipe 8. The movable frame 11 moves relative to each other in the moving groove 24, and both sides are guided in the side moving groove 25, so that the movable rod is pushed back into the concave-convex groove 10 to supplement and fix the clamping rod 9 and prevent the clamping rod 9 from rotating.

[0031] Please refer to Figure 1-6 , as a supplementary implementation method of a tensioning device for a PP plastic sheet production line for the pressure-pull guide roller mechanism, the partition clamping mechanism, and the clamping auxiliary mechanism: The moving groove 24 is arranged inside the movable sleeve 23, and the side moving grooves 25 are arranged on both sides inside the movable sleeve 23. Both sides of the movable frame 11 are slidably guided in the side moving grooves 25, so that the movable frame 11 extends horizontally into the concave-convex groove 10. A bottom plate 26 is installed at the bottom of the frame 1, and a support block 27 is installed on the side surface of the bottom plate 26. A diversion plate 28 is installed on the support block 27. Limit plates 29 are installed on both sides of the top end surface of the diversion plate 28. A movable partition 30 is movably arranged in the middle position of the diversion plate 28. A side plate 31 is installed on the side surface of the movable partition 30. A connecting plate 32 is installed at the bottom of the side wall of the clamping pipe 8, and the bottom of the connecting plate 32 is cooperatively connected with the top of the side plate 31. A clamping hole 33 is formed in the movable partition 30, and multiple groups of clamping holes 33 are provided. One end of the clamping rod 9 is rotatably connected with the clamping hole 33 in a limiting manner, and the other end of the clamping rod 9 extends through the side plate 31 and is cooperatively and quickly clamped with the clamping pipe 8. By connecting the clamping rod 9 to different clamping holes 33, the adjustment of the movable partition 30 is realized. A support 34 is installed on the side surface of the bottom plate 26, and a guide sleeve 35 is installed on the top of the support 34. A guide rod 37 is installed on one side of the top end surface of the pressure-pull roller 4, and the guide rod 37 is slidably guided in the guide sleeve 35 in a cooperative manner. A return spring 36 is installed on the top of the connecting plate 32, and the other end of the return spring 36 is cooperatively connected with the bottom of the movable sleeve 23.

[0032] More specifically, the hydraulic cylinder 2 pushes the mounting sleeve 3 to adjust the position of the pressing and pulling roller 4. The smooth movement of the pressing and pulling roller 4 is ensured through the guide rod 37 and the guide sleeve 35. The driving motor 6 is started to drive the guide roller 5 to rotate, and the polypropylene plastic sheet is fed between the guide roller 5 and the pressing and pulling roller 4. The pressing and pulling roller 4 and the guide roller 5 work together to stretch the sheet. The guide plate 28 and the limiting plate 29 guide the movement direction of the sheet. The clamping rod 9 is operated to move and rotate through the insertion groove 13 and the rotation groove 14. The clamping rod 9 is connected to different clamping holes 33 on the movable partition 30 to adjust the partition position, realizing the quick installation and disassembly of the movable partition 30 on the guide plate 28. By controlling the position of the movable partition 30, it is convenient to guide plastics of different widths. The pressing, pulling and guiding roller mechanism continuously works to maintain the tension of the sheet. As needed, the partition position can be adjusted at any time. During the whole process, the frame 1 and the support structure ensure the stability of the equipment.

[0033] In summary, when the whole equipment is in use or operation: when the operation of the pressing, pulling and guiding roller mechanism is required, the plastic is placed between the pressing and pulling roller 4 and the guide roller 5. The hydraulic cylinder 2 pushes the mounting sleeve 3, thereby adjusting the position of the pressing and pulling roller 4. The driving motor 6 is started, and the two guide rollers 5 are driven to rotate through the gear transmission group 7. The pressing and pulling roller 4 and the guide roller 5 act together to stretch and guide the plastic sheet.

[0034] When the operation of the partition clamping mechanism is required, the quick installation and disassembly of the movable partition 30 on the guide plate 28 is realized. By controlling the position of the movable partition 30, it is convenient to guide plastics of different widths. At this time, the clamping rod 9 longitudinally moves in the insertion groove 13 through the rotating block 12. The rotating block 12 enters the rotation groove 14, driving the clamping rod 9 to rotate, so that the clamping rod 9 is initially fixed in the clamping pipe 8. After the rotation process of the clamping rod 9, the concave-convex groove 10 and the movable frame 11 are matched by using the clamping auxiliary mechanism, and the movable frame 11 moves horizontally and passes through the side wall of the clamping pipe 8 to realize the re-fixation of the clamping.

[0035] When the operation of the clamping auxiliary mechanism is required, the movable rod 16 longitudinally moves on the matching ring 15 to compress the support spring 17. While the rotating sleeve 20 rotates, the top block 18 is successively pushed into the top groove 19 at the bottom of the rotating sleeve 20 to cooperate with the stable support rotation. When the rotating sleeve 20 rotates, the slope push block 21 pushes the top slope block 22 on the movable sleeve 23, so that the movable sleeve 23 longitudinally slides on the outer wall of the clamping pipe 8. The movable frame 11 moves relatively in the moving groove 24, and the two sides are guided in the side moving groove 25, so that the movable rod is pushed back into the concave-convex groove 10 to supplement the fixation of the clamping rod 9 and prevent the clamping rod 9 from rotating.

[0036] The hydraulic cylinder 2 pushes the mounting sleeve 3 to adjust the position of the pressing and pulling roller 4. The smooth movement of the pressing and pulling roller 4 is ensured through the guide rod 37 and the guide sleeve 35. The driving motor 6 is started to drive the guide roller 5 to rotate, and the polypropylene plastic sheet is fed between the guide roller 5 and the pressing and pulling roller 4. The pressing and pulling roller 4 and the guide roller 5 work together to stretch the sheet. The guide plate 28 and the limiting plate 29 guide the movement direction of the sheet. The clamping rod 9 is operated to move and rotate through the insertion groove 13 and the rotation groove 14. The clamping rod 9 is connected to different clamping holes 33 on the moving partition plate 30, and the position of the partition plate is adjusted to realize the quick installation and disassembly of the moving partition plate 30 on the guide plate 28. By controlling the position of the moving partition plate 30, it is convenient to guide plastics of different widths. The pressing, pulling and guiding roller mechanism works continuously to maintain the tension of the sheet. According to needs, the position of the partition plate can be adjusted at any time. During the whole process, the frame 1 and the supporting structure ensure the stability of the equipment.

[0037] Among all the solutions mentioned above, for the connection between two components, welding, the cooperation connection of bolts and nuts, bolt or screw connection or other well-known connection methods can be selected according to the actual situation, which will not be elaborated one by one here. For those mentioned above that involve fixed connection, welding is preferably considered. Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A tensioning device for a PP plastic sheet production line, comprising a frame (1), a pressing and pulling guide roller mechanism, a partition clamping mechanism and a clamping assistance mechanism, characterized in that: The pressing and pulling roller mechanism includes a hydraulic cylinder (2), a mounting sleeve (3), a pressing and pulling roller (4), a guiding roller (5), a driving motor (6) and a gear transmission group (7). The mounting sleeve (3) is arranged on the pressing and pulling roller (4). The hydraulic cylinders (2) are installed on both sides of the frame (1), and the pushing ends of the hydraulic cylinders (2) are connected to the mounting sleeve (3). Two groups of guiding rollers (5) are cooperatively installed on both sides of the frame (1). The gear transmission group (7) connects the two groups of guiding rollers (5). The driving motor (6) is connected to the gear transmission group (7). The partition clamping mechanism includes a clamping pipe (8), a clamping rod (9), a concave-convex groove (10), a moving frame (11), a rotating block (12), a inserting groove (13) and a rotating groove (14). The inserting groove (13) and the rotating groove (14) are arranged on the inner wall of the clamping pipe (8). The rotating block (12) is arranged on the side wall of the clamping rod (9). The rotating block (12) first moves longitudinally in the moving groove (24), and then drives the rotating block (12) to rotate and slide in the rotating groove (14). The concave-convex groove (10) is arranged on the side wall of the clamping rod (9). The moving frame (11) is horizontally movably arranged through the side wall of the clamping pipe (8).

2. The tensioning device for a PP plastic sheet production line according to claim 1, characterized in that: The clamping auxiliary mechanism includes a mating ring (15), a movable rod (16), a support spring (17), a top block (18), a top groove (19), a rotating sleeve (20), a slope pushing block (21), a slope receiving block (22), a movable sleeve (23), a moving groove (24) and a side moving groove (25). The mating ring (15) is fixedly arranged on the side wall of the clamping pipe (8). The movable rod (16) longitudinally extends into and is movably arranged on the mating ring (15). The support spring (17) is arranged between the top block (18) at one end of the movable rod (16) and the mating ring (15). The rotating sleeve (20) rotates directionally on the outer wall of the clamping pipe (8). The top groove (19) is arranged at the bottom of the rotating sleeve (20). The top block (18) is successively inserted into the top groove (19), so that while the rotating sleeve (20) rotates, stable support is obtained. The movable sleeve (23) cooperatively slides longitudinally on the outer wall of the clamping pipe (8). The slope pushing block (21) is arranged on the top of the rotating sleeve (20). The slope receiving block (22) is arranged at the bottom of the movable sleeve (23).

3. The tensioning device for a PP plastic sheet production line according to claim 2, characterized in that: The moving groove (24) is arranged inside the movable sleeve (23). The side moving grooves (25) are arranged on both sides inside the movable sleeve (23). Both sides of the moving frame (11) are slidably guided in the side moving grooves (25), so that the moving frame (11) horizontally extends into the concave-convex groove (10). A bottom plate (26) is installed at the bottom of the frame (1), and a support block (27) is installed on the side surface of the bottom plate (26), and a guiding plate (28) is installed on the support block (27).

4. The tensioning device for a PP plastic sheet production line according to claim 3, characterized in that: Limit plates (29) are installed on both sides of the top end face of the guiding plate (28). A movable partition (30) is movably arranged at the middle position of the guiding plate (28), and a side plate (31) is installed on the side surface of the movable partition (30).

5. The tensioning device for a PP plastic sheet production line according to claim 1, characterized in that: A connecting plate (32) is installed at the bottom of the side wall of the clamping pipe (8), and the bottom of the connecting plate (32) is cooperatively connected to the top of the side plate (31).

6. The tensioning device for a PP plastic sheet production line according to claim 4, characterized in that: The movable partition plate (30) is provided with clamping holes (33), and multiple groups of clamping holes (33) are provided. One end of the clamping rod (9) is in limiting rotational connection with the clamping hole (33) in a matching manner, and the other end of the clamping rod (9) extends through the side plate (31) and is in quick clamping connection with the clamping pipe (8). By connecting different clamping holes (33) with the clamping rod (9), the adjustment of the movable partition plate (30) is realized.

7. The tensioning device for a PP plastic sheet production line according to claim 3, characterized in that: A bracket (34) is installed on the side surface of the bottom plate, and a guide sleeve (35) is installed on the top of the bracket (34). A guide rod (37) is installed on one side of the top end face of the pressing and pulling roller (4), and the guide rod (37) is arranged in the guide sleeve (35) in a guiding and sliding manner in a matching way.

8. A tensioning device for a PP plastic sheet production line according to claim 5, characterized in that: A return spring (36) is installed on the top of the connecting plate (32), and the other end of the return spring (36) is connected with the bottom of the movable sleeve (23) in a matching manner.

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