Plastic film forming machine with anti-wrinkle function

Abstract

The invention relates to a plastic film forming machine with an anti-wrinkle function applied to the field of film blowing machines, a herringbone frame changing unit adopts a rotating cylinder to be matched with an electric extension rod to adjust the spatial position of a guide roller, a linear arrangement state or a curve fitting state can be switched, and guide paths with different curvature radiuses are formed by adjusting the expansion amount of the electric extension rod; after the visual detection module recognizes wrinkles of the film, an electromagnetic vertical block is triggered to drive a magnetic rolling ring to move along a guide rod, a clamping rubber block is matched to pull and flatten the film, in addition, a defective gear ring is adopted to replace a hoop ring, the rotating angle of the defective gear ring is adjusted through an electric push rod and a gear piece, and fine position adjustment of a guide roller in the circumferential direction is achieved; the guide rollers at the inlet section are densely distributed while the guide rollers at the outlet section are sparsely distributed, the internal stress of the film is gradually released, and the whole system remarkably improves the flatness of film forming through the synergistic effect of mechanical structure adjustment and intelligent detection.

Description

Technical Field

[0001] The present invention relates to a plastic film forming machine, and particularly to a plastic film forming machine with an anti-wrinkle function applied to the field of blown film machines. Background Art

[0002] A blown film machine is a device that produces plastic films through an extrusion molding process and is widely used in fields such as packaging, agriculture, and medical treatment. During the production process of a blown film machine, film wrinkles are common quality problems, which will lead to an increase in the product rejection rate.

[0003] The specification of Chinese invention patent CN111516248B discloses a blown film machine for plastic film production and its production process, which can prevent dust from adhering to the film and can also prevent wrinkles from occurring when the film is wound, ensuring the quality of the film.

[0004] The specification of Chinese invention patent CN117227151B discloses an anti-wrinkle pressing film mechanism for PE film production. The embedding strips provided on the stretching roller can apply a force from the middle to both sides to the film body by using the friction between itself and the film body, so as to further unfold the film body and avoid the film body from shifting and wrinkling.

[0005] The existing blown film machines usually perform anti-wrinkle treatment by cleaning dust and static electricity to achieve the anti-wrinkle purpose. However, in actual operation, the herringbone frame is usually straight. At the fold angle of the film, local stress concentration will occur due to the sudden change in direction, which is likely to cause excessive stretching of the film edge or central accumulation, forming a V-shaped wrinkle. This type of wrinkle cannot be avoided by removing dust and preventing static electricity. Instead, through a smooth curvature transition, the film tension distribution is made more uniform and the stress peak value is reduced. Therefore, it is necessary to adjust the path of the guide roller inside the herringbone frame of the blown film machine. Summary of the Invention

[0006] Aiming at the above-mentioned prior art, the technical problem to be solved by the present invention is how to adjust the path of the guide roller in the herringbone frame of the blown film machine according to different blown film requirements.

[0007] To solve the above problems, the present invention provides a plastic film forming machine with an anti-wrinkle function, which includes a support main body. Inside the support main body, a blown film head is installed. Inside the support main body, two symmetrically arranged herringbone frame changing units are installed. Each herringbone frame changing unit includes two vertical plates installed inside the support main body. On the surfaces of the two vertical plates close to each other, a rotating cylinder is rotatably installed. On the surfaces of both ends of the rotating cylinder, hoop rings are fixedly sleeved. On the surface of each hoop ring, a plurality of electro-extensible rods are installed. At the power end of each electro-extensible rod, a support block is installed. On the surface of the support block, a guiding roller is rotatably connected. Adjacent two support blocks in the vertical direction are connected by an elastic strip; A No. 1 motor is installed on the surface of the vertical plate located on the same horizontal axis in the two herringbone frame variable units, and the output end of each No. 1 motor is connected to the end of one of the rotating cylinders; A traction roller and a winding roller located above the herringbone frame variable unit are installed inside the bracket body, and the winding roller is located on one side of the traction roller.

[0008] In the above-mentioned plastic film forming machine with anti-wrinkle function, the herringbone frame variable unit adopts a rotating cylinder and an electric stretching rod to adjust the spatial position of the guide roller, and can switch between a straight line arrangement or a curve fitting state, and form a guide path with different curvature radii by adjusting the extension and contraction amount of the electric stretching rod.

[0009] As a further improvement of the present application, a visual inspection module is provided on one side of the bracket body for identifying the wrinkle features on the surface of the film passing through the surface of the guide roller. The surface of the guide roller is equipped with symmetrically arranged self-correction units connected to the signal of the visual inspection module. The self-correction units include electromagnetic blocks installed on the top of the bracket block. Guide rods are installed on the surfaces of the electromagnetic blocks close to each other. The surface of the guide rods is slidably connected with a magnetic roller ring that is covered and connected to the outside of the guide roller. A drive motor is installed on the surface of the magnetic roller ring. The output end of the drive motor is connected to a clamping rubber block.

[0010] As a further improvement of the present application, a cooling air duct is provided inside the rotating cylinder, and the outlet of the cooling air duct faces the contact area between the guide roller and the film, a plurality of balls that are in rolling contact with the surface of the guide roller are installed on the inner wall of the magnetic roller, and a displacement sensor connected to the electromagnetic block signal is embedded inside the magnetic roller.

[0011] As another improvement of the present application, the hoop is replaced by a defective gear ring rotatably mounted on the surface of the rotating cylinder, and the arc length occupied by the teeth on the surface of the defective gear ring is less than one circle, and a double-headed motor is inlaid on the surface of the rotating cylinder, and electric push rods are installed at both output ends of the double-headed motor, and gear parts are installed on the ends of the electric push rods, and the teeth of the gear parts are meshed with the surface of the defective gear ring.

[0012] As another improvement supplement to the present application, the number of defective gear rings at one end of the rotating cylinder is the same as the installed number of the electric extension rod, and the smooth part of the defective gear ring surface from the middle of the rotating cylinder along the end direction is connected to the surface of the electric extension rod through an L-shaped connecting rod, and the outermost defective gear ring is directly fixedly connected to the surface of the electric extension rod.

[0013] As another improvement supplement to the present application, the projections of the ends of the L-shaped connecting rod from the middle of the rotating cylinder along the end direction on the surface of the electric extension rod are successively approached toward the guide roller, and the embedding position of the double-headed motor on the surface of the rotating cylinder is located in the direction of the rotating cylinder away from the guide roller.

[0014] As a supplement to another improvement of this application, an electric telescopic rod with its power end extending out of the outer surface of the rotating cylinder is installed inside the rotating cylinder. A jack is provided on the surface of the defective gear ring close to the rotating cylinder, and the jack is matched with the power end of the electric telescopic rod.

[0015] As another improvement of this application, the working steps of the herringbone frame changing unit are as follows: S1. When the herringbone frame changing unit needs to maintain a straight shape, adjust the distances of the multiple electric telescopic rods on the surface of the hoop so that the multiple guiding rollers are in the same vertical plane. Then drive the rotating cylinder to rotate through the first motor to adjust the two herringbone frame changing units arranged in a straight line to form an inverted V arrangement. S2. When the herringbone frame changing unit needs to maintain a curve transition state, adjust the multiple electric telescopic rods on the surface of the hoop to be of equal or unequal lengths, and place the uppermost electric telescopic rod horizontally so that the multiple guiding rollers fit into curves with different radii of curvature. S3. On the basis of S2, first start the electric push rod to drive the gear part to move to the surface of the corresponding defective gear ring. Then start the double-headed motor to drive the defective gear ring to rotate by a specified radian to achieve the purpose of adjusting the fitting points inside the fitting curve.

[0016] In summary, the herringbone frame changing unit uses a rotating cylinder in cooperation with an electric telescopic rod to adjust the spatial position of the guiding rollers, and can switch between a straight arrangement or a curve fitting state. By adjusting the telescopic amount of the electric telescopic rod, a guiding path with different radii of curvature is formed. After the visual inspection module recognizes the film wrinkles, it triggers the electromagnetic upright block to drive the magnetic moving ring to move along the guide rod, and cooperates with the clamping rubber block to traction and flatten the film. In addition, a defective gear ring is used to replace the hoop, and the rotation angle of the defective gear ring is adjusted through the electric push rod and the gear part to achieve fine position adjustment of the guiding rollers in the circumferential direction, so that the guiding rollers in the inlet section are densely distributed and those in the outlet section are sparsely distributed, gradually releasing the internal stress of the film. The whole set of systems significantly improves the flatness of film forming through the synergistic effect of mechanical structure adjustment and intelligent detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is the overall structural schematic diagram of the first embodiment of this application; Figure 2 is for this application Figure 1 the enlarged schematic diagram of part A in; Figure 3 is the structural diagram of the herringbone frame changing unit of the first embodiment of this application; Figure 4 is the state diagram when the herringbone frame changing unit of the first embodiment of this application is arranged in a straight line; Figure 5 is the state diagram when the herringbone frame changing unit of the first embodiment of this application is a quarter - circumference arc; Figure 6State diagram when the herringbone frame changing unit in the first implementation mode of this application is a curve with other curvature radii; Figure 7 Structural schematic diagram of the self-correcting unit in the first implementation mode of this application; Figure 8 State diagram when the herringbone frame changing unit in the first implementation mode of this application is a curve with other curvature radii; Figure 9 Installation diagram of the double-headed motor, electric push rod and defective gear ring in the second implementation mode of this application; Figure 10 Installation diagram of the L-shaped connecting rod and the defective gear ring in the second implementation mode of this application; Figure 11 Top view of the L-shaped connecting rod in the second implementation mode of this application; Figure 12 Schematic diagram of the electric telescopic rod and the insertion hole in the second implementation mode of this application; Figure 13 Schematic diagram of the state where the insertion hole and the electric telescopic rod are inserted and limited after the defective gear ring rotates in the second implementation mode of this application; Figure 14 Schematic diagram of the state of refined adjustment of the fitting points in the second implementation mode of this application.

[0018] Explanation of the reference numerals in the figure: 1. Bracket main body; 2. Film blowing head; 3. First motor; 4. Rotating cylinder; 41. Hoop; 42. Defective gear ring; 5. Bracket block; 6. Guide roller; 7. Electric extension rod; 8. Elastic strip; 9. Double-headed motor; 10. Electric push rod; 11. Gear part; 12. L-shaped connecting rod; 13. Electric telescopic rod; 14. Insertion hole; 15. Electromagnetic upright block; 16. Magnetic moving ring; 17. Driving motor; 18. Clamping rubber block; 19. Guide rod. Specific implementation mode

[0019] The following will make a detailed description of the three implementation modes of this application with reference to the accompanying drawings.

[0020] The first implementation mode: Figures 1-3A plastic film forming machine with an anti-wrinkle function is shown, including a bracket main body 1. Inside the bracket main body 1, a film blowing head 2 is installed. Inside the bracket main body 1, two symmetrically arranged herringbone frame changing units are installed. Each herringbone frame changing unit includes two vertical plates installed inside the bracket main body 1. On the surfaces of the two vertical plates close to each other, a rotating cylinder 4 is rotatably installed. On the surfaces of the two ends of the rotating cylinder 4, hoop rings 41 are fixedly sleeved. On the surface of each hoop ring 41, a plurality of electro-extensible rods 7 are installed. On the power end of each electro-extensible rod 7, a bracket block 5 is installed. On the surface of the bracket block 5, a guiding roller 6 is rotatably connected. Adjacent two bracket blocks 5 in the vertical direction are connected by an elastic strip 8; On the surfaces of the vertical plates of the two herringbone frame changing units located on the same horizontal axis, a first motor 3 is installed, and the output end of each first motor 3 is connected to the end of one of the rotating cylinders 4; Inside the bracket main body 1, a traction roller and a winding roller are installed above the herringbone frame changing unit, and the winding roller is located on one side of the traction roller.

[0021] Specifically, during the film blowing operation, the film blown out by the film blowing head 2 (the film blown out by the film blowing head 2 is prior art and will not be elaborated too much) goes upward, is guided by the guiding roller 6 inside the herringbone frame changing unit, then passes through the traction roller, and finally is wound by the winding roller.

[0022] When the guiding roller 6 inside the herringbone frame changing unit needs to be arranged in a straight line, the elongation distances of the plurality of electro-extensible rods 7 can be adjusted so that the guiding rollers 6 at the ends of each electro-extensible rod 7 are in the same vertical plane. Then, start the first motor 3, which can drive the hoop ring 41 and the plurality of guiding rollers 6 arranged in a straight line to rotate, forming an inverted V-shaped structure (as Figure 4 shown). By adjusting the rotation angle of the rotating cylinder 4, the opening degree of the V-shaped structure can be adjusted to achieve different guiding effects.

[0023] When the herringbone frame changing unit needs to be in a curve transition state, according to the actual required curve state, if it is a quarter arc state, the elongation distances of the plurality of electro-extensible rods 7 on the surface of the hoop ring 41 are equal (as Figure 5 shown). If it is other curve states, the elongation distances of the plurality of electro-extensible rods 7 on the surface of the hoop ring 41 are adjusted according to actual needs (as Figure 6 shown), forming a plurality of fitting points at different positions (each guiding roller 6 is equivalent to a fitting point at the movable end of the electro-extensible rod 7. By the different positions of the plurality of guiding rollers 6, the path of the curve formed by fitting is different), so as to adjust the steepness of the entrance section of the guiding area of the herringbone frame changing unit.

[0024] Figure 7It is shown that a visual detection module is provided on one side of the bracket body 1 for identifying the wrinkle features on the surface of the film passing through the surface of the guiding roller 6. Symmetrically arranged self-correcting units signal-connected to the visual detection module are installed on the surface of the guiding roller 6. The self-correcting unit includes an electromagnetic upright block 15 installed on the top of the bracket block 5. Guide rods 19 are installed on the surfaces of the electromagnetic upright blocks 15 close to each other. A magnetic moving ring 16 covering the outside of the guiding roller 6 is slidably connected to the surface of the guide rod 19. A driving motor 17 is installed on the surface of the magnetic moving ring 16, and a clamping rubber block 18 is connected to the output end of the driving motor 17.

[0025] A cooling air duct is provided inside the rotating cylinder 4, and the outlet of the cooling air duct faces the contact area between the guiding roller 6 and the film. A plurality of balls in rolling contact with the surface of the guiding roller 6 are installed on the inner wall of the magnetic moving ring 16, and a displacement sensor signal-connected to the electromagnetic upright block 15 is embedded and installed inside the magnetic moving ring 16.

[0026] Specifically, when guiding the film on the surface of the guiding roller 6, if wrinkles appear on the film on the surface of the guiding roller 6, after being detected by the visual detection module (through image analysis, there is an obvious difference between the film without wrinkles and the film with wrinkles, which is prior art and will not be elaborated too much), the electromagnetic upright block 15 is started to generate a repulsive force with the magnetic moving ring 16, so that it moves to both ends of the film (the specific moving distance can be analyzed according to the distance between both ends of the film photographed by the visual detection module and the two magnetic moving rings 16 in the initial state. Then, during the moving process, the displacement sensor can be used to assist in judging the moving distance of the magnetic moving ring 16). Subsequently, the driving motor 17 is started to drive the clamping rubber block 18 to rotate and press on the surface of the film. After forming a clamping effect with the surface of the guiding roller 6, the electromagnetic upright block 15 is started to generate an attractive effect with the magnetic moving ring 16, so that the two magnetic moving rings 16 move in the opposite direction to form a pulling effect to perform a traction and flattening operation on the wrinkled area (as Figure 8 shown).

[0027] In addition, the design of the balls and the cooperation with the guide rod 19 can realize the covering of the magnetic moving ring 16 on the outer surface of the guiding roller 6 and is not affected by the rotation of the guiding roller 6.

[0028] The second implementation method: Figures 9-11 It is shown that the hoop 41 is replaced by a defective gear ring 42 rotatably installed on the surface of the rotating cylinder 4, and the arc length occupied by the teeth on the surface of the defective gear ring 42 is less than one week. A double-headed motor 9 is embedded and installed on the surface of the rotating cylinder 4. Electric push rods 10 are installed at both output ends of the double-headed motor 9. A gear member 11 is installed at the end of the electric push rod 10, and the teeth of the gear member 11 mesh with the surface of the defective gear ring 42.

[0029] The number of defective gear rings 42 at one end of the rotating cylinder 4 is the same as the number of installed electro-extending rods 7. The smooth part of the surface of the defective gear ring 42 along the end direction from the middle of the rotating cylinder 4 is connected to the surface of the electro-extending rod 7 through the L-shaped connecting rod 12, and the outermost defective gear ring 42 is directly fixedly connected to the surface of the electro-extending rod 7.

[0030] From the middle of the rotating cylinder 4 along the end direction, the projections of the ends of the L-shaped connecting rod 12 on the surface of the electro-extending rod 7 successively approach the direction of the guiding roller 6, and the inlaid position of the double-headed motor 9 on the surface of the rotating cylinder 4 is located in the direction away from the guiding roller 6 of the rotating cylinder 4.

[0031] Different from the first embodiment, this embodiment mainly adjusts the position of the electro-extending rod 7 to achieve a refined adjustment of the fitting points.

[0032] Specifically, in the first embodiment, the hoop 41 is fixedly installed on the surface of the rotating cylinder 4, and the ends of multiple electro-extending rods 7 are fixed on the surface of the rotating cylinder 4. Therefore, the positions of multiple fitting points can only be adjusted radially (with the rotating cylinder 4 as the center, by adjusting the elongation distance of the electro-extending rod 7 to adjust the radius, and thus achieve the adjustment of the fitting points), resulting in limitations on the fitted curve.

[0033] To achieve a refined adjustment of the distance between the fitting points, during the adjustment, the electric push rod 10 can be used to drive the gear part 11 to move to the surface of the defective gear ring 42 corresponding to the corresponding fitting point (guiding roller 6) (since the gear part 11 meshes with the defective gear ring 42, and through pushing, the meshing between the two can be achieved. If there is a coincidence resistance between the teeth during the process, the electric push rod 10 can be retracted to drive the gear part 11 away from the surface of the defective gear ring 42, and the double-headed motor 9 can be started to drive the gear part 11 to rotate slightly, so that the subsequent gear part 11 can be smoothly meshed during the pushing process). After the gear part 11 meshes with the defective gear ring 42 at the corresponding position, the double-headed motor 9 is started to drive the meshed defective gear ring 42 to rotate by the corresponding radian. After adjusting the circumferential arrangement position of the electro-extending rod 7, the defective gear ring 42 and the surface of the rotating cylinder 4 are fixed, so that the number of guiding rollers 6 in the inlet section is relatively dense, and the number of guiding rollers 6 in the outlet section is relatively sparse, forming an asymmetric arrangement of the guiding rollers 6 (as shown in Figure 14 ), so as to achieve the purpose of gradually releasing the internal stress of the film.

[0034] Figure 12 As shown, an electric telescopic rod 13 with a power end extending out of the outer surface of the rotating cylinder 4 is installed inside the rotating cylinder 4. A jack 14 is provided on the surface of the defective gear ring 42 close to the rotating cylinder 4, and the jack 14 matches the power end of the electric telescopic rod 13.

[0035] Specifically, after rotating the defective gear ring 42, the electric telescopic rod 13 is extended and inserted into the jack 14 to restrain the defective gear ring 42 (as Figure 13 shown).

[0036] The third implementation method: The working steps of the herringbone frame change unit are as follows: S1. When the herringbone frame change unit needs to maintain a straight shape, adjust the distances of the multiple electric telescopic rods 7 on the surface of the hoop 41 so that the multiple guide rollers 6 are in the same vertical plane. Then, drive the rotating cylinder 4 to rotate through the first motor 3 to adjust the two straight-arranged herringbone frame change units to form an inverted V arrangement; S2. When the herringbone frame change unit needs to maintain a curve transition state, adjust the multiple electric telescopic rods 7 on the surface of the hoop 41 to be of equal or unequal lengths, and horizontally place the uppermost electric telescopic rod 7 so that the multiple guide rollers 6 fit into curves with different radii of curvature; S3. On the basis of S2, first start the electric push rod 10 to drive the gear part 11 to move to the surface of the corresponding defective gear ring 42. Subsequently, start the double-headed motor 9 to drive the defective gear ring 42 to rotate by a specified arc to achieve the purpose of adjusting the fitting points inside the fitting curve.

[0037] In summary, the herringbone frame change unit uses the rotating cylinder 4 in cooperation with the electric telescopic rod 7 to adjust the spatial position of the guide roller 6, and can switch between a straight arrangement or a curve fitting state. By adjusting the telescopic amount of the electric telescopic rod 7, a guiding path with different radii of curvature is formed. After the visual detection module identifies the film wrinkles, it triggers the electromagnetic upright block 15 to drive the magnetic moving ring 16 to move along the guide rod 19, and cooperates with the clamping rubber block 18 to traction and flatten the film. In addition, the defective gear ring 42 is used to replace the hoop 41, and the rotation angle of the defective gear ring 42 is adjusted through the electric push rod 10 and the gear part 11 to achieve fine position adjustment of the guide roller 6 in the circumferential direction, so that the guide rollers 6 in the inlet section are densely distributed and the outlet section is sparse, gradually releasing the internal stress of the film. The whole set of systems significantly improves the flatness of the film forming through the synergistic effect of mechanical structure adjustment and intelligent detection.

[0038] Combined with the current actual needs, the above implementation methods adopted in this application, the protection scope is not limited to this. Within the scope of knowledge possessed by those skilled in the art, various changes made without departing from the concept of this application still fall within the protection scope of the present invention.

Claims

1. A plastic film forming machine with an anti-wrinkle function, comprising a bracket main body (1), wherein a film blowing head (2) is installed inside the bracket main body (1), and it is characterized in that: Inside the bracket main body (1), there are two symmetrically arranged herringbone frame changing units. Each herringbone frame changing unit includes two vertical plates installed inside the bracket main body (1). On the surfaces of the two vertical plates close to each other, a rotating cylinder (4) is rotatably installed. On the surfaces of the two ends of the rotating cylinder (4), hoop rings (41) are fixedly sleeved. On the surface of each hoop ring (41), a plurality of electric extension rods (7) are installed. On the power end of each electric extension rod (7), a bracket block (5) is installed. On the surface of the bracket block (5), a guiding roller (6) is rotatably connected. In the vertical direction, adjacent two bracket blocks (5) are connected by an elastic strip (8). On the surfaces of the vertical plates of the two herringbone frame changing units located on the same horizontal axis, a first motor (3) is installed, and the output end of each first motor (3) is connected to the end of one of the rotating cylinders (4). Inside the bracket main body (1), a traction roller and a winding roller are installed above the herringbone frame changing unit, and the winding roller is located on one side of the traction roller.

2. A plastic film forming machine with an anti-wrinkle function according to claim 1, characterized in that: On one side of the bracket main body (1), a visual detection module is provided for identifying the wrinkle characteristics on the surface of the film passing through the surface of the guiding roller (6). On the surface of the guiding roller (6), symmetrically arranged self-correcting units signal-connected to the visual detection module are installed. The self-correcting unit includes an electromagnetic vertical block (15) installed on the top of the bracket block (5). On the surfaces of the electromagnetic vertical blocks (15) close to each other, guide rods (19) are installed. On the surface of the guide rods (19), a magnetic moving ring (16) covering the outside of the guiding roller (6) is slidably connected. On the surface of the magnetic moving ring (16), a driving motor (17) is installed. The output end of the driving motor (17) is connected to a clamping rubber block (18).

3. A plastic film forming machine with an anti-wrinkle function according to claim 2, characterized in that: Inside the rotating cylinder (4), a cooling air duct is provided, and the outlet of the cooling air duct faces the contact area between the guiding roller (6) and the film. On the inner wall of the magnetic moving ring (16), a plurality of balls rolling on the surface of the guiding roller (6) are installed, and inside the magnetic moving ring (16), a displacement sensor signal-connected to the electromagnetic vertical block (15) is inlaid and installed.

4. A plastic film forming machine with an anti-wrinkle function according to claim 1, characterized in that: The hoop ring (41) is replaced by a defective gear ring (42) rotatably installed on the surface of the rotating cylinder (4), and the arc length occupied by the teeth on the surface of the defective gear ring (42) is less than one week. On the surface of the rotating cylinder (4), a double-headed motor (9) is inlaid and installed. On the two output ends of the double-headed motor (9), electric push rods (10) are installed. On the end of the electric push rod (10), a gear part (11) is installed, and the teeth of the gear part (11) mesh with the surface of the defective gear ring (42).

5. A plastic film forming machine with an anti-wrinkle function according to claim 4, characterized in that: The number of defective gear rings (42) at one end of the rotating cylinder (4) is the same as the installation number of the electric extension rods (7). From the middle of the rotating cylinder (4) along the end direction, the smooth part on the surface of the defective gear ring (42) is connected to the surface of the electric extension rod (7) through an L-shaped connecting rod (12), and the outermost defective gear ring (42) is directly fixedly connected to the surface of the electric extension rod (7).

6. A plastic film forming machine with an anti-wrinkle function according to claim 5, characterized in that: The end of the L-shaped connecting rod (12) along the end direction in the middle of the rotating cylinder (4) approaches the direction of the guiding roller (6) in sequence in the projection on the surface of the electric telescopic rod (7), and the inlay position of the double-headed motor (9) on the surface of the rotating cylinder (4) is located in the direction of the rotating cylinder (4) away from the guiding roller (6).

7. A plastic film forming machine with an anti-wrinkle function according to claim 5, characterized in that: An electric telescopic rod (13) with a power end extending out of the outer surface of the rotating cylinder (4) is installed inside the rotating cylinder (4). A jack (14) is provided on the surface of the defective gear ring (42) close to the rotating cylinder (4), and the jack (14) is matched with the power end of the electric telescopic rod (13).

8. A plastic film forming machine with an anti-wrinkle function according to any one of claims 1-7, characterized in that, The working steps of the herringbone frame changing unit are as follows: S1. When the herringbone frame changing unit needs to maintain a straight line shape, adjust the distances of the plurality of electric telescopic rods (7) on the surface of the hoop (41) so that the plurality of guiding rollers (6) are in the same vertical plane, and then drive the rotating cylinder (4) to rotate through the first motor (3) to adjust the two herringbone frame changing units arranged in a straight line to form an inverted V arrangement; S2. When the herringbone frame changing unit needs to maintain a curve transition state, adjust the plurality of electric telescopic rods (7) on the surface of the hoop (41) to an equal length or unequal length state, and horizontally place the uppermost electric telescopic rod (7) so that the plurality of guiding rollers (6) fit into curves with different curvature radii; S3. On the basis of S2, first start the electric push rod (10) to drive the gear member (11) to move to the surface of the corresponding defective gear ring (42), and then start the double-headed motor (9) to drive the defective gear ring (42) to rotate a specified radian to achieve the purpose of adjusting the fitting points inside the fitting curve.

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