A plastic film forming machine with anti-wrinkle function

Abstract

The present invention relates to a plastic film forming machine with an anti-wrinkle function applied to the field of film blowing machines. The herringbone frame changing 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 state and a curve fitting state. The guide path with different curvature radii is formed by adjusting the extension and contraction amount of the electric stretching rod. After the visual detection module identifies the wrinkles of the film, it triggers the electromagnetic vertical block to drive the magnetic roller ring to move along the guide rod, and cooperates with the clamping rubber block to pull and flatten the film. In addition, a defective gear ring is used to replace the hoop ring, and the rotation angle of the defective gear ring is adjusted by the electric push rod and the gear part to realize the fine position adjustment of the guide roller in the circumferential direction, so that the guide rollers in the inlet section are densely distributed and the outlet section is sparse, and the stress in the film is gradually released. The whole system significantly improves the flatness of the film forming through the synergistic effect of mechanical structure adjustment and intelligent detection.

Description

Technical Field

[0001] The invention relates to a plastic film forming machine, in particular to a plastic film forming machine with an anti-wrinkle function applied in the field of film blowing machines. Background Art

[0002] Film blowing machines are used to produce plastic films through an extrusion process and are widely used in packaging, agriculture, healthcare, and other fields. Film wrinkles are a common quality issue during the film blowing process, leading to increased product scrap rates.

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

[0004] The specification of Chinese invention patent CN117227151B discloses an anti-wrinkle film pressing mechanism for PE film production. The embedded strips arranged on the stretching roller can use the friction between the strips and the film body to give the film body a force from the middle to both sides, thereby achieving further expansion of the film body and avoiding deviation and wrinkles of the film body.

[0005] Existing film blowing machines usually perform anti-wrinkle treatment by cleaning dust and static electricity to achieve the purpose of anti-wrinkle. However, in actual operation, the herringbone frame is usually straight, and the film will produce local stress concentration due to sudden changes in direction at the corners, which can easily lead to excessive stretching of the film edges or accumulation in the center, forming V-shaped wrinkles. This type of wrinkle cannot be avoided by removing dust and anti-static measures, but by smoothing the curvature transition to make the film tension distribution more uniform and reduce the stress peak. Therefore, it is necessary to adjust the path of the guide rollers in the herringbone frame of the film blowing machine. Summary of the Invention

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

[0007] To solve the above problems, the present invention provides a plastic film forming machine with an anti-wrinkle function, comprising a bracket main body, a film blowing head installed inside the bracket main body, two symmetrically arranged herringbone frame variable units installed inside the bracket main body, each herringbone frame variable unit comprising two vertical plates installed inside the bracket main body, a rotating cylinder rotatably installed on the surfaces of the two vertical plates close to each other, a hoop fixedly sleeved on the surface of both end portions of the rotating cylinder, a plurality of electric extension rods installed on the surface of each hoop, a bracket block installed on the power end of each electric extension rod, a guide roller rotatably connected to the surface of the bracket block, and two adjacent bracket blocks in the vertical direction are connected by an elastic strip;

[0008] 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;

[0009] A traction roller and a winding roller located above the herringbone frame changing unit are installed inside the bracket body, and the winding roller is located on one side of the traction roller.

[0010] In the above-mentioned plastic film forming machine with anti-wrinkle function, the herringbone frame variable unit uses a rotating cylinder and an electric stretching rod to adjust the spatial position of the guide roller. It 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.

[0011] As a further improvement of the present application, a visual detection 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 detection module. The self-correction units include electromagnetic blocks installed on the top of the bracket block. The surfaces of the electromagnetic blocks close to each other are equipped with guide rods. The surface of the guide rod is slidably connected to a magnetic roller ring connected to the outside of the guide roller. The surface of the magnetic roller ring is equipped with a drive motor, and the output end of the drive motor is connected to a clamping rubber block.

[0012] 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 in the interior of the magnetic roller.

[0013] 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. A double-headed motor is embedded in the surface of the rotating cylinder, and electric push rods are installed at both output ends of the double-headed motor. A gear part is installed at the end of the electric push rod, and the teeth of the gear part are engaged with the surface of the defective gear ring.

[0014] 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 number of installed electric extension rods. The smooth part of the surface of the defective gear ring 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 defective gear ring at the outermost end is directly fixedly connected to the surface of the electric extension rod.

[0015] As another improvement supplement to the present application, the projections of the ends of the L-shaped connecting rods 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 embedded 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.

[0016] As another improved supplement to the present application, an electric telescopic rod with a power end extending out of the outer surface of the rotating cylinder is installed inside the rotating cylinder, and a socket is provided on the surface of the defective gear ring near the rotating cylinder, and the socket matches the power end of the electric telescopic rod.

[0017] As another improvement of the present application, the working steps of the herringbone frame changing unit are as follows:

[0018] S1. When the herringbone variable unit needs to maintain a straight line, the distance between the multiple electric extension rods on the hoop surface is adjusted so that the multiple guide rollers are in the same vertical plane. Then, the rotating drum is driven by the first motor to rotate to adjust the two herringbone variable units placed in a straight line to form an inverted V arrangement;

[0019] S2. When the herringbone frame changing unit needs to maintain a curve transition state, multiple electric extension rods on the hoop surface are adjusted to be equal or unequal in length, and the uppermost electric extension rod is placed horizontally so that multiple guide rollers are fitted into curves with different curvature radii;

[0020] S3. Based on S2, first start the electric push rod to drive the gear part to move to the corresponding defective gear ring surface, then start the double-headed motor to drive the defective gear ring to rotate the specified arc to achieve the purpose of adjusting the fitting point in the fitting curve.

[0021] To summarize, the herringbone frame change unit uses a rotating cylinder in conjunction with an electric stretch rod to adjust the spatial position of the guide roller, and can switch between a straight line arrangement or a curve fitting state. By adjusting the extension and contraction of the electric stretch rod, a guide path with different curvature radii is formed. After the visual inspection module identifies the wrinkles in the film, it triggers the electromagnetic vertical block to drive the magnetic roller ring to move along the guide rod, and cooperates with the clamping rubber block to pull and flatten the film. In addition, a defective gear ring is used to replace the hoop ring, and the rotation angle of the defective gear ring is adjusted by an electric push rod and a gear part to realize the fine position adjustment of the guide roller in the circumferential direction, so that the guide rollers in the inlet section are densely distributed and the outlet section is sparse, gradually releasing the stress in the film. The entire system significantly improves the flatness of the film forming through the synergy of mechanical structure adjustment and intelligent detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the overall structure of the first embodiment of this application;

[0023] Figure 2 For this application Figure 1 An enlarged schematic diagram of point A in FIG.

[0024] Figure 3 This is a structural diagram of the herringbone frame change unit in the first embodiment of the present application;

[0025] Figure 4 This is a state diagram of the first embodiment of the present application when the herringbone frame change unit is arranged in a linear shape;

[0026] Figure 5 This is a state diagram of the first embodiment of the present application when the herringbone frame change unit is a quarter-circle arc;

[0027] Figure 6 This is a state diagram of the first embodiment of the present application when the herringbone frame change unit is a curve with other curvature radii;

[0028] Figure 7 This is a schematic structural diagram of a self-correcting unit according to a first embodiment of the present application;

[0029] Figure 8 This is a state diagram of the first embodiment of the present application when the herringbone frame change unit is a curve with other curvature radii;

[0030] Figure 9 This is an installation diagram of a double-headed motor, an electric push rod, and a defective ring gear according to the second embodiment of the present application;

[0031] Figure 10 This is an installation diagram of an L-shaped connecting rod and a defective ring gear according to the second embodiment of the present application;

[0032] Figure 11 A top view of an L-shaped connecting rod according to a second embodiment of the present application;

[0033] Figure 12 This is a schematic diagram of an electric telescopic rod and a plug-in hole according to a second embodiment of the present application;

[0034] Figure 13 This is a schematic diagram of the plug-in limit state of the plug-in hole and the electric telescopic rod in the second embodiment of the present application after the defective gear ring rotates;

[0035] Figure 14 This is a state diagram of the refinement adjustment of the fitting points in the second embodiment of the present application.

[0036] Description of the numbers in the figure:

[0037] 1. Bracket body; 2. Film blowing head; 3. No. 1 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. Jack; 15. Electromagnetic stand block; 16. Magnetic roller; 17. Drive motor; 18. Clamping rubber block; 19. Guide rod. DETAILED DESCRIPTION

[0038] The following describes three implementation methods of the present application in detail with reference to the accompanying drawings.

[0039] The first implementation method:

[0040] Figure 1-Figure 3 A plastic film forming machine with an anti-wrinkle function is shown, comprising a support body 1, a film blowing head 2 being installed inside the support body 1, two symmetrically arranged herringbone frame variable units being installed inside the support body 1, each herringbone frame variable unit comprising two vertical plates installed inside the support body 1, a rotating cylinder 4 being rotatably installed on the surfaces of the two vertical plates close to each other, a hoop 41 being fixedly sleeved on the surface of each end of the rotating cylinder 4, a plurality of electric extension rods 7 being installed on the surface of each hoop 41, a support block 5 being installed on the power end of each electric extension rod 7, a guide roller 6 being rotatably connected to the surface of the support block 5, and two adjacent support blocks 5 being connected in the vertical direction by an elastic strip 8;

[0041] A No. 1 motor 3 is installed on the surface of the vertical plate located on the same horizontal axis in the two herringbone frame change units, and the output end of each No. 1 motor 3 is connected to the end of one of the rotating cylinders 4;

[0042] A traction roller and a winding roller located above the herringbone frame changing unit are installed inside the bracket body 1, and the winding roller is located on one side of the traction roller.

[0043] Specifically, when the film blowing operation is performed, the film blown out by the film blowing head 2 (the film blowing by the film blowing head 2 is the existing technology and will not be described in detail) is guided upward by the guide roller 6 in the herringbone frame variable unit, then passes through the traction roller, and is finally wound up by the winding roller.

[0044] When the guide rollers 6 in the herringbone frame variable unit need to be arranged in a straight line, the extension distance of the multiple electric extension rods 7 can be adjusted so that the guide rollers 6 at the end of each electric extension rod 7 are on the same vertical plane. Then, the No. 1 motor 3 is started to drive the hoop 41 and the multiple guide rollers 6 arranged in a straight line to rotate, forming an inverted V-shaped structure (such as Figure 4 As 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.

[0045] 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 extension distances of the multiple electric extension rods 7 on the surface of the hoop 41 are equal (such as Figure 5 As shown), if it is other curved state, the extension distance of the plurality of electric extension rods 7 on the surface of the hoop 41 is adjusted according to the actual needs (such as Figure 6 As shown), multiple fitting points at different positions are formed (each guide roller 6 at the movable end of the electric extension rod 7 is equivalent to a fitting point, and the paths of the curves formed by fitting are different due to the different positions of the multiple guide rollers 6), thereby adjusting the steepness of the entrance section of the guide area of the herringbone frame change unit.

[0046] Figure 7 It 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 guide roller 6. The surface of the guide roller 6 is equipped with symmetrically arranged self-correction units connected to the signal of the visual detection module. The self-correction units include electromagnetic blocks 15 installed on the top of the bracket block 5. The surfaces of the electromagnetic blocks 15 close to each other are equipped with guide rods 19. The surface of the guide rod 19 is slidably connected to a magnetic roller 16 that is connected to the outside of the guide roller 6. The surface of the magnetic roller 16 is equipped with a drive motor 17. The output end of the drive motor 17 is connected to a clamping rubber block 18.

[0047] A cooling air duct is provided inside the rotating drum 4, and the outlet of the cooling air duct faces the contact area between the guide roller 6 and the film. The inner wall of the magnetic roller 16 is installed with a plurality of balls that are in rolling contact with the surface of the guide roller 6, and the interior of the magnetic roller 16 is embedded with a displacement sensor connected to the signal of the electromagnetic block 15.

[0048] Specifically, when the film is guided on the surface of the guide roller 6, if wrinkles appear on the film on the surface of the guide roller 6, the visual inspection module (through image analysis, there is an obvious difference between a film without wrinkles and a film with wrinkles. This is a prior art and will not be described in detail) detects this, and then the electromagnetic stand 15 is started to generate a repulsive force with the magnetic roller 16, so that it moves to the two ends of the film (the specific moving distance can be analyzed based on the distance between the two ends of the film and the two magnetic rollers 16 in the initial state captured by the visual inspection module, and then the displacement sensor can be used to assist in judging the moving distance of the magnetic roller 16 during the movement). Then, the drive motor 17 is started to drive the clamping rubber block 18 to rotate and press it onto the surface of the film. After forming a clamping effect with the surface of the guide roller 6, the electromagnetic stand 15 is started to generate an attraction effect with the magnetic roller 16, so that the two magnetic rollers 16 move in opposite directions, forming a pulling effect, and performing a pulling and flattening operation on the wrinkled area (such as Figure 8 shown).

[0049] In addition, the design of the ball and the cooperation with the guide rod 19 can achieve the covering connection of the magnetic roller 16 on the outer surface of the guide roller 6 without being affected by the rotation of the guide roller 6.

[0050] The second implementation method:

[0051] Figures 9-11 It is shown that the hoop 41 is replaced by a defective gear ring 42 rotatably mounted 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 circle. A double-headed motor 9 is embedded in the surface of the rotating cylinder 4, and electric push rods 10 are installed at both output ends of the double-headed motor 9. A gear part 11 is installed at the end of the electric push rod 10, and the teeth of the gear part 11 are engaged with the surface of the defective gear ring 42.

[0052] The number of defective gear rings 42 at one end of the rotating cylinder 4 is the same as the number of installed electric extension rods 7. The smooth part of the defective gear ring 42 from the middle of the rotating cylinder 4 along the end direction is connected to the surface of the electric extension rod 7 through an L-shaped connecting rod 12, and the defective gear ring 42 at the outermost end is directly fixedly connected to the surface of the electric extension rod 7.

[0053] The projections of the ends of the L-shaped connecting rod 12 on the surface of the electric extension rod 7 from the middle of the rotating drum 4 along the end direction approach the guide roller 6 in sequence, and the embedded position of the double-headed motor 9 on the surface of the rotating drum 4 is located in the direction of the rotating drum 4 away from the guide roller 6.

[0054] Different from the first embodiment, this embodiment mainly adjusts the position of the extension rod 7 to achieve detailed adjustment of the fitting points.

[0055] Specifically, in the first embodiment, the hoop 41 is fixedly mounted on the surface of the rotating cylinder 4, and the ends of the plurality of electric extension rods 7 are fixed on the surface of the rotating cylinder 4. Therefore, the positions of the plurality of fitting points can only be adjusted radially (with the rotating cylinder 4 as the center, the radius is adjusted by the extension distance of the electric extension rods 7, thereby achieving the adjustment of the fitting points), resulting in the fitting curve being limited.

[0056] In order to achieve fine adjustment of the distance between the fitting points, 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 (guide roller 6) during adjustment (because the gear part 11 is engaged with the defective gear ring 42, the meshing between the two can be achieved by pushing. If the overlapping resistance between the gear teeth is encountered on the way, 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 a small amplitude, so that the subsequent gear part 11 can be smoothly engaged during the pushing process). After that, the gear part 11 is engaged with the defective gear ring 42 at the corresponding position, the double-headed motor 9 is started to drive the defective gear ring 42 engaged therewith to rotate the corresponding arc, and after adjusting the arrangement position of the electric extension rod 7 in the circumferential direction, the defective gear ring 42 and the surface of the rotating cylinder 4 are fixed, so that the number of guide rollers 6 in the inlet section is relatively dense, and the number of guide rollers 6 in the outlet section is relatively dispersed, forming an asymmetrical arrangement of guide rollers 6 (such as Figure 14 As shown in Figure 2), the stress inside the film is gradually released.

[0057] 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, and a socket 14 is provided on the surface of the defective gear ring 42 close to the rotating cylinder 4, and the socket 14 matches the power end of the electric telescopic rod 13.

[0058] Specifically, after the defective gear ring 42 is rotated, the electric telescopic rod 13 is extended to insert it into the socket 14, thereby constraining the defective gear ring 42 (such as Figure 13 shown).

[0059] The third implementation method:

[0060] The working steps of the herringbone frame change unit are as follows:

[0061] S1. When the herringbone variable unit needs to maintain a straight line, the distance between the multiple electric extension rods 7 on the surface of the hoop 41 is adjusted so that the multiple guide rollers 6 are in the same vertical plane. Then, the first motor 3 drives the rotating drum 4 to rotate to adjust the two straight-lined herringbone variable units to form an inverted V arrangement;

[0062] S2. When the herringbone frame changing unit needs to maintain a curved transition state, the multiple electric extension rods 7 on the surface of the hoop 41 are adjusted to be equal or unequal in length, and the uppermost electric extension rod 7 is placed horizontally, so that the multiple guide rollers 6 are fitted into curves with different curvature radii;

[0063] S3. Based on S2, first start the electric push rod 10 to drive the gear part 11 to move to the surface of the corresponding defective ring gear 42, and then start the double-headed motor 9 to drive the defective ring gear 42 to rotate a specified arc to achieve the purpose of adjusting the fitting point in the fitting curve.

[0064] In summary, the herringbone frame change unit uses a rotating cylinder 4 to cooperate with the electric stretching rod 7 to adjust the spatial position of the guide roller 6, and can switch between a straight line arrangement or a curve fitting state. By adjusting the extension and contraction amount of the electric stretching rod 7, a guide path with different curvature radii is formed. After the visual detection module identifies the wrinkles in the film, it triggers the electromagnetic vertical block 15 to drive the magnetic roller 16 to move along the guide rod 19, and cooperates with the clamping rubber block 18 to pull and flatten the film. In addition, a defective gear ring 42 is used to replace the hoop 41. The rotation angle of the defective gear ring 42 is adjusted by the electric push rod 10 and the gear part 11 to realize the 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, and the stress in the film is gradually released. The whole system significantly improves the flatness of the film forming through the synergy of mechanical structure adjustment and intelligent detection.

[0065] In view of current actual needs, the protection scope of the above-mentioned implementation mode adopted in this application is not limited to this. Various changes made within the knowledge scope of technical personnel in this field 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 support body (1), wherein a film blowing head (2) is installed inside the support body (1), characterized in that: Two symmetrically arranged herringbone frame variable units are installed inside the bracket body (1), and each of the herringbone frame variable units includes two vertical plates installed inside the bracket body (1), and the surfaces of the two vertical plates close to each other are rotatably mounted with a rotating cylinder (4), and the surfaces of the two end portions of the rotating cylinder (4) are fixedly sleeved with a hoop (41), and the surface of each hoop (41) is mounted with a plurality of electric extension rods (7), and the power end of each electric extension rod (7) is mounted with a bracket block (5), and the surface of the bracket block (5) is rotatably connected with a guide roller (6), and two adjacent bracket blocks (5) in the vertical direction are connected by an elastic strip (8); A No. 1 motor (3) 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 (3) is connected to the end of one of the rotating cylinders (4); A traction roller and a winding roller located above the herringbone frame changing unit are installed inside the bracket body (1), and the winding roller is located on one side of the traction roller; A visual inspection module is provided on one side of the bracket body (1) for identifying wrinkle features on the surface of the film passing through the surface of the guide roller (6); a self-correction unit symmetrically arranged and connected to the signal of the visual inspection module is installed on the surface of the guide roller (6); the self-correction unit comprises an electromagnetic vertical block (15) installed on the top of the bracket block (5); guide rods (19) are installed on the surfaces of the electromagnetic vertical blocks (15) close to each other; a magnetic roller (16) is slidably connected to the surface of the guide rod (19) and is connected to the outer side of the guide roller (6); a driving motor (17) is installed on the surface of the magnetic roller (16); and an output end of the driving motor (17) is connected to a clamping rubber block (18); 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 guide roller (6) and the film. A plurality of balls that are in rolling contact with the surface of the guide roller (6) are installed on the inner wall of the magnetic roller (16), and a displacement sensor connected to the signal of the electromagnetic stand (15) is embedded in the interior of the magnetic roller (16); The hoop (41) is a defective gear ring (42) rotatably mounted 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 circle. A double-headed motor (9) is embedded and mounted on the surface of the rotating cylinder (4), and electric push rods (10) are mounted on both output ends of the double-headed motor (9). A gear member (11) is mounted on the end of the electric push rod (10), and the teeth of the gear member (11) are meshed with the surface of the defective gear ring (42).

2. The plastic film forming machine with anti-wrinkle function according to claim 1, characterized in that: The number of defective gear rings (42) at one end of the rotating cylinder (4) is the same as the number of installed electric extension rods (7), and the smooth surface portion of the defective gear rings (42) along the end direction from the middle of the rotating cylinder (4) is connected to the surface of the electric extension rod (7) through an L-shaped connecting rod (12), and the defective gear ring (42) at the outermost end is directly fixedly connected to the surface of the electric extension rod (7).

3. The plastic film forming machine with anti-wrinkle function according to claim 2, characterized in that: The projections of the ends of the L-shaped connecting rod (12) on the surface of the electric extension rod (7) from the middle of the rotating drum (4) along the end direction successively approach the direction of the guide roller (6), and the embedded position of the double-headed motor (9) on the surface of the rotating drum (4) is located in the direction of the rotating drum (4) away from the guide roller (6).

4. The plastic film forming machine with anti-wrinkle function according to claim 1, 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 socket (14) is provided on the surface of the defective gear ring (42) close to the rotating cylinder (4), and the socket (14) matches the power end of the electric telescopic rod (13).

5. A plastic film forming machine with an anti-wrinkle function according to any one of claims 1 to 4, characterized in that: The working steps of the herringbone frame change unit are as follows: S1. When the herringbone frame variable unit needs to be kept in a straight line, the distance between the multiple electric extension rods (7) on the surface of the hoop (41) is adjusted so that the multiple guide rollers (6) are in the same vertical plane, and then the rotating cylinder (4) is driven by the No. 1 motor (3) to rotate to adjust the two herringbone frame variable units placed in a straight line to form an inverted V arrangement; S2. When the herringbone frame changing unit needs to maintain a curve transition state, the plurality of electric extension rods (7) on the surface of the hoop (41) are adjusted to be equal in length or unequal in length, and the uppermost electric extension rod (7) is placed horizontally, so that the plurality of guide rollers (6) are fitted into curves with different curvature radii; S3. Based on S2, the electric push rod (10) is first started to drive the gear member (11) to move to the surface of the corresponding defective ring gear (42), and then the double-headed motor (9) is started to drive the defective ring gear (42) to rotate a specified arc to achieve the purpose of adjusting the fitting point in the fitting curve.

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