A film blowing apparatus for polyethylene packaging film

Abstract

This invention relates to the field of film manufacturing equipment, specifically a blown film equipment for polyethylene packaging film, including a vertical frame and an extrusion assembly. The extrusion assembly extrudes molten raw material upwards, forming film bubbles. The vertical frame is equipped with a herringbone clamping mechanism for guiding the film bubbles upwards and flattening them to form a double-layer flat film. This invention employs a moving component to dynamically adjust the angle between the two support frames according to the upward movement speed of the film bubbles, and a sliding component to dynamically adjust the spacing between adjacent guide rollers according to the upward movement speed of the film bubbles. Simultaneously, a roller-adhesive assembly matches the rotational speed of the guide rollers with the actual upward movement speed of the film bubbles, and the roller-adhesive assembly flexibly cools the surface temperature of the guide rollers to a specified range. This allows the herringbone clamping mechanism to automatically adapt to changes in the flattening path, clamping gap, roller rotational speed, and roller surface temperature as the traction speed changes, thereby ensuring the flattening quality of the film bubbles at different speeds.

Description

Technical Field

[0001] This invention relates to the field of film manufacturing equipment, specifically a blown film equipment for polyethylene packaging film. Background Technology

[0002] The blown film machine is the core equipment in the field of plastic film production. Its basic function is to heat and melt plastic particles, then extrude them through an annular die to form a cylindrical film preform. Compressed air blown into the preform causes it to expand radially to form a film bubble. After cooling, flattening, traction, and winding, a continuous double-layer flat film product is finally produced.

[0003] Existing blown film machines typically consist of several core components, including an extrusion system, a die head and a cooling air ring, a herringbone clamp bonding assembly, a traction system, and a winding system. The herringbone clamp bonding assembly is located above the cooling air ring and is used to gradually flatten the cylindrical film bubble into a double-layer flat film. The traction system is located above the herringbone clamp bonding assembly or at a subsequent station and provides traction power for the upward movement of the film bubble.

[0004] The herringbone clamping assembly is the core component in a blown film machine that determines whether the film bubble can be flattened with high quality. It typically includes herringbone clamps, rollers, and mounting brackets. The herringbone clamps consist of two clamps symmetrically arranged on both sides of the film bubble's running path, forming a flattening channel that gradually narrows from top to bottom between the two clamps. Its function is to gradually fold and flatten the rising cylindrical film bubble into a double-layer flat film through progressive extrusion during its vertical ascent.

[0005] First, the opening angle of the herringbone clamp can only be adjusted to a limited extent by manual adjustment. Once the traction speed changes, the fixed clamp angle cannot adapt to the changes in the flattening path required by the speed change. For example, when the speed increases, the membrane bubble will suddenly wrinkle due to the flattening path being too short; when the speed decreases, the membrane bubble will shake due to the flattening path being too long, both of which seriously affect the flattening quality.

[0006] Secondly, the clamping gap between the pressure rollers is also fixed or needs to be manually adjusted, and cannot be automatically adjusted with the change of traction speed. When the speed increases, the rolling pressure demand increases while the gap remains unchanged, resulting in slippage. When the speed decreases, the gap remains unchanged, but the film is damaged due to excessive clamping force.

[0007] Furthermore, existing pressure rollers lack an active temperature control structure linked to speed. When running at high speed, the roller surface temperature rises sharply due to friction and heat conduction, causing film adhesion and thermal deformation, which further damages the flattening effect.

[0008] The combined effect of the above factors has led to a long-standing technical problem in this field: in actual production, the traction speed needs to be frequently adjusted according to factors such as film specifications and production requirements. However, the angle of the herringbone clamps, the gap between the pressure rollers, the cleaning of the roller surface, and the control of the roller surface temperature cannot be automatically adapted to the speed changes. This makes it difficult to ensure the uniform flattening quality of the film bubble at different speeds. Flattening quality defects such as film wrinkles, uneven thickness, scratches, and thermal deformation occur frequently, which seriously restricts the production efficiency and product quality of blown film machines. Summary of the Invention

[0009] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a blown film device for polyethylene packaging film, including a vertical frame and an extrusion assembly. The extrusion assembly extrudes molten raw material upward and causes the raw material to form a film bubble. The vertical frame is provided with a herringbone clamping mechanism for guiding the film bubble upward and flattening it to form a double-layer flat film. The herringbone clamping mechanism dynamically adjusts the angle and spacing of the herringbone clamping mechanism by monitoring the actual moving speed of the film bubble.

[0010] The herringbone clamping mechanism includes two symmetrically arranged support frames mounted on a vertical frame via a movable component. The movable component dynamically adjusts the included angle between the two support frames according to the upward movement speed of the membrane bubble. Several guide rollers are arranged at equal intervals along the length of the support frame via a sliding component. The sliding component dynamically adjusts the spacing between adjacent guide rollers according to the upward movement speed of the membrane bubble.

[0011] The herringbone clamping mechanism also includes a roller-adjusting assembly that actively adjusts the rotational speed of the guide roller. The roller-adjusting assembly matches the rotational speed of the guide roller with the actual moving speed of the film bubble, and flexibly cools the surface temperature of the guide roller to a specified range.

[0012] Based on the actual moving speed of the membrane bubble, the included angle between the two support frames, as well as the spacing, rotation speed, and surface temperature of the guide rollers, are adjusted to achieve efficient and stable uniform flattening of the membrane bubble.

[0013] Preferably, the moving component includes two hydraulic cylinders fixedly mounted on a vertical frame, two horizontal plates slidingly connected to the vertical frame, the horizontal plates being hinged to corresponding support frames, and the telescopic section of the hydraulic cylinders being fixedly connected to the corresponding horizontal plates.

[0014] Preferably, the moving assembly further includes two electric cylinders hinged to the vertical frame, the telescopic sections of which are hinged to the support frame.

[0015] Preferably, the sliding assembly includes several plates slidably connected to both sides of the support frame, with two corresponding plates rotatably connected to corresponding guide rollers, and the positions of the two uppermost plates on the same support frame locked.

[0016] Preferably, two variable pitch screws are rotatably mounted on the support frame, and the variable pitch screws are threadedly connected to the plates on the corresponding sides. A geared motor that drives the variable pitch screws is fixedly installed on the support frame.

[0017] Preferably, the roller assembly includes a linkage frame that is slidably connected to two corresponding plates, a roller frame that is rotatably mounted on the linkage frame, and a rubber water bladder that is detachably connected to the outside of the roller frame. The rubber water bladder is attached to the outer side of the guide roller and cools down through heat conduction.

[0018] Preferably, the roller frame has two extrusion discs threadedly connected to it, and the rubber water bag is sealed and attached to the roller frame by twisting the extrusion discs.

[0019] Preferably, a second hydraulic cylinder is fixedly installed on the linkage frame, the telescopic section of the second hydraulic cylinder is fixedly connected to the plate, and a synchronous motor for driving the roller frame to rotate is fixedly installed on the front side of the linkage frame.

[0020] Preferably, an inlet and outlet water pipe is fixedly installed on the rear side of the linkage frame, and the inlet and outlet water pipe is rotatably connected to the roller frame in a sealed manner.

[0021] Preferably, the inlet and outlet water pipes allow cooling water to enter the front part of the inner side of the roller frame, then the cooling water flows backward, and then the cooling water flows out through the inlet and outlet water pipes.

[0022] The beneficial effects of this invention are as follows: First, this invention uses a moving component to dynamically adjust the angle between the two support frames according to the upward movement speed of the film bubble, and a sliding component to dynamically adjust the spacing between adjacent guide rollers according to the upward movement speed of the film bubble. At the same time, the roller-adhesive component matches the rotation speed of the guide rollers with the actual upward movement speed of the film bubble, and the roller-adhesive component flexibly cools the surface temperature of the guide rollers to a specified range. This allows the herringbone clamping mechanism to automatically adapt to the flattening path, clamping gap, roller rotation speed, and roller surface temperature according to changes in traction speed, thereby ensuring the flattening quality of the film bubble at different speeds. This effectively avoids the frequent occurrence of flattening quality defects such as film wrinkles, uneven thickness, scratches, and thermal deformation caused by speed changes as described in the background art, and significantly ensures the production efficiency and product quality of the blown film machine.

[0023] Second, this invention uses a hydraulic cylinder and an electric cylinder to jointly adjust the relative distance between the two support frames; at the same time, it uses separate control of the extension and retraction of the electric cylinder's extension section to precisely adjust the included angle between the two support frames, adapting to the flattening path requirements under different bubble diameters and speeds.

[0024] Third, the present invention uses a geared motor to drive a variable pitch screw to rotate. The constant pitch change characteristic of the variable pitch screw makes each plate move synchronously along the length of the support frame and the spacing between adjacent plates change by an equal amount. This achieves the synchronous change of the spacing of all guide rollers, ensuring that the film bubble is subjected to uniform force during the flattening process at different speeds.

[0025] Fourth, this invention uses a rubber water bladder to abut against the outer surface of the corresponding guide roller. By adjusting the sliding displacement of the linkage frame, the wrap angle of the rubber water bladder to the guide roller is changed, thereby realizing flexible adjustment of the cooling capacity of the guide roller surface and maintaining the surface temperature of the guide roller within a specified range. This effectively avoids film adhesion and thermal deformation caused by the rapid increase in roller surface temperature due to friction and heat conduction during high-speed operation.

[0026] Fifth, this invention uses a rubber water bladder attached to the outer side of the guide roller. The friction between the two allows the rubber water bladder to actively drive the guide roller to rotate according to the actual speed of the membrane bubble's upward movement. This ensures that the rotation speed of the guide roller can be precisely matched with the speed of the membrane bubble. This avoids the membrane bubble from being poorly pulled or stretched due to excessive frictional resistance when the rotation speed is too low, and also avoids the membrane bubble from accumulating or folding due to active pushing when the rotation speed is too high. This further ensures the stability of the membrane bubble flattening process and the surface quality of the film. Attached Figure Description

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0028] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 This is a partial sectional view of the vertical frame, the support frame, the hydraulic cylinder, and the electric cylinder in this invention;

[0030] Figure 3 This is a schematic diagram of the structure of the support frame, the roller assembly, the guide roller and the reduction motor in this invention;

[0031] Figure 4 This is a schematic diagram of the structure of the support frame, hydraulic cylinder II, synchronous motor and variable pitch screw in this invention;

[0032] Figure 5 This is a partial structural schematic diagram of the guide roller, rubber water bladder, linkage frame and extrusion disc in this invention;

[0033] Figure 6 This is a partial cross-sectional view of the support frame, plates, and guide rollers in this invention;

[0034] Figure 7 This is a partial cross-sectional view of the linkage frame, rubber water bladder, roller frame and extrusion disc in this invention;

[0035] Figure 8 This is a cross-sectional view of the roller frame and the inlet / outlet water pipes in this invention.

[0036] In the diagram: 1. Vertical frame; 2. Extrusion assembly; 3. Herringbone clamp mechanism; 31. Moving component; 32. Bearing frame; 33. Sliding component; 34. Guide roller; 35. Adhesive roller assembly; 311. Hydraulic cylinder one; 312. Horizontal plate; 313. Electric cylinder; 331. Plate; 332. Variable pitch screw; 333. Gear motor; 351. Linkage frame; 352. Roller frame; 353. Rubber water bladder; 354. Extrusion disc; 355. Hydraulic cylinder two; 356. Synchronous motor; 357. Inlet and outlet water pipes. Detailed Implementation

[0037] The embodiments of the present invention are described in detail below. The embodiments described below are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. Where specific techniques or conditions are not specified in the embodiments, they shall be performed in accordance with the techniques or conditions described in the literature in the art or in accordance with the product manual.

[0038] See Figure 1 , Figure 2 and Figure 3 A blown film device for polyethylene packaging film includes a vertical frame 1 and an extrusion assembly 2. The extrusion assembly 2 extrudes molten raw material upwards, causing the raw material to form a film bubble. The vertical frame 1 is provided with a herringbone clamping mechanism 3 for guiding the film bubble upwards and flattening it to form a double-layer flat film. The angle and spacing of the herringbone clamping mechanism 3 are dynamically adjusted by monitoring the actual moving speed of the film bubble.

[0039] When blowing polyethylene packaging film, the extrusion assembly 2 extrudes the molten raw material upward and blows it into a film bubble, and the film bubble moves upward and passes through the herringbone clamping mechanism 3. The herringbone clamping mechanism 3 flattens the film bubble into a double-layer flat film. The angle and spacing of the herringbone clamping mechanism 3 are dynamically adjusted according to the actual moving speed of the film bubble, and the temperature of the herringbone clamping mechanism 3 is flexibly controlled within a specified range, effectively avoiding film adhesion and thermal deformation.

[0040] In this embodiment, the extrusion assembly 2 adopts the structure commonly used in traditional blown film equipment, and the vertical frame 1 is also equipped with a traction structure for pulling the film material and a winding structure for winding the film material. The traction structure pulls the double-layer flat film upward, while the winding structure winds the film material.

[0041] See Figure 1 , Figure 2 , Figure 3 and Figure 4The herringbone clamping mechanism 3 includes two symmetrically arranged support frames 32 mounted on the vertical frame 1 via a moving component 31. The moving component 31 dynamically adjusts the included angle between the two support frames 32 according to the upward movement speed of the membrane bubble. Several guide rollers 34 are arranged at equal intervals along the length direction of the support frame 32 via a sliding component 33. The sliding component 33 dynamically adjusts the spacing between adjacent guide rollers 34 according to the upward movement speed of the membrane bubble.

[0042] During film blowing, the film bubble passes between two support frames 32, causing the guide rollers 34 on the two support frames 32 to gradually compress the film bubble, flattening it into a double-layer flat film. When flattening the film bubble, the moving component 31 dynamically adjusts the angle between the two support frames 32 according to the upward movement speed of the film bubble, thereby dynamically adjusting the flattening path of the guide rollers 34 on the film bubble. When the upward movement speed of the film bubble increases, the angle between the two support frames 32 is controlled to increase accordingly; when the upward movement speed of the film bubble decreases, the angle between the two support frames 32 is controlled to decrease accordingly, providing a gradual flattening path for the high-speed film bubble and avoiding wrinkles in the film material caused by sudden changes.

[0043] When flattening the film bubble, the sliding component 33 dynamically adjusts the distance between the guide rollers 34 on the two support frames 32 according to the upward movement speed of the film bubble, so that the distance between the guide rollers 34 changes by an equal amount, thereby realizing the synchronous change of the distance between all guide rollers 34. When the actual upward movement speed of the film bubble increases, the distance between the guide rollers 34 is adjusted to decrease accordingly, thereby increasing the clamping force of the guide rollers 34 on the film material. Conversely, the distance between the guide rollers 34 is reduced to ensure that the film bubble is subjected to uniform force during the flattening process, and to avoid local wrinkles or stretching deformation of the film material caused by inconsistent spacing.

[0044] See Figure 1 , Figure 3 , Figure 4 and Figure 5 The herringbone clamping mechanism 3 also includes a roller assembly 35 that actively adjusts the rotation speed of the guide roller 34. The roller assembly 35 matches the rotation speed of the guide roller 34 with the actual moving speed of the film bubble, and the roller assembly 35 flexibly cools the surface temperature of the guide roller 34 to a specified range.

[0045] When flattening the film bubble, the applicator roller assembly 35 actively rotates each guide roller 34, so that the rotation speed of the guide roller 34 matches the actual moving speed of the film bubble. This avoids the film bubble from being poorly pulled or stretched due to excessive frictional resistance when the rotation speed is too low, and also avoids the film bubble from piling up or folding due to active pushing when the rotation speed is too high. In addition, the applicator roller assembly 35 flexibly cools the surface temperature of the guide roller 34 to a specified range. In this embodiment, the surface temperature of the guide roller 34 is kept between 40°C and 60°C.

[0046] In this embodiment, an infrared thermometer is provided on the applicator roller assembly 35 (not shown in the figure). The infrared thermometer monitors the surface temperature of the guide roller 34 in real time and transmits the monitoring data to the host computer in real time. The host computer can then use the monitoring data to control the applicator roller assembly 35 to flexibly cool the surface temperature of the guide roller 34, thereby maintaining the surface temperature of the guide roller 34 between 40°C and 60°C.

[0047] In this embodiment, a common non-contact speed monitor is installed on the vertical frame 1. This speed monitor is not shown in the figure. The non-contact speed monitor monitors the actual moving speed of the membrane bubble and transmits the speed parameters to the host computer in real time. The host computer uses the speed parameters to control and adjust the included angle of the two support frames 32 in real time, adjust the spacing of the guide rollers 34 in real time, and adjust the rotation speed of the guide rollers 34 in real time. The included angle, spacing, and rotation speed are all obtained through repeated calculations by those skilled in the art.

[0048] To facilitate adjustment of the included angle between the two support frames 32, the present invention designs the following structure: (See attached diagram) Figure 1 , Figure 2 and Figure 3 The moving component 31 includes two hydraulic cylinders 311 fixedly mounted on the vertical frame 1. Two horizontal plates 312 are horizontally slidably connected on the vertical frame 1. The horizontal plates 312 are hinged to the corresponding support frame 32. The telescopic section of the hydraulic cylinder 311 is fixedly connected to the corresponding horizontal plate 312. The moving component 31 also includes two electric cylinders 313 hinged on the vertical frame 1. The telescopic section of the electric cylinders 313 is hinged to the support frame 32.

[0049] Before blowing the film, the extension sections of the hydraulic cylinder 311 and the electric cylinder 313 are controlled simultaneously, so that the hydraulic cylinder 311 drives the upper side of the support frame 32 to move closer to the middle of the vertical frame 1 through the horizontal plate 312; at the same time, the electric cylinder 313 drives the lower side of the support frame 32 to move closer to the middle of the vertical frame 1, so that the support frame 32 drives the guide roller 34 to press on the film bubble; when flattening the film bubble, the extension and retraction of the extension section of the electric cylinder 313 is controlled separately to adjust the distance between the lower sides of the two support frames 32, thereby flexibly adjusting the included angle of the two support frames 32.

[0050] To facilitate the adjustment of the spacing between the guide rollers 34, the present invention designs the following structure: (See attached diagram) Figure 3 , Figure 4 , Figure 5 and Figure 6 The sliding assembly 33 includes several plates 331 that are slidably connected to both sides of the support frame 32. Two corresponding plates 331 are rotatably connected to corresponding guide rollers 34. The positions of the two uppermost plates 331 on the same support frame 32 are locked.

[0051] Continue reading Figure 3 , Figure 4 and Figure 5 Two variable pitch screws 332 are rotatably mounted on the support frame 32. The variable pitch screws 332 are threadedly connected to the plate 331 on the corresponding side. A geared motor 333 that drives the variable pitch screws 332 is fixedly mounted on the support frame 32.

[0052] The variable pitch screw 332 is rotated by the geared motor 333. The constant pitch change characteristic of the variable pitch screw 332 causes each plate 331 to move synchronously along the length of the support frame 32. This makes the spacing between adjacent plates 331 change by an equal amount, thereby realizing the synchronous change of the spacing of all guide rollers 34. This ensures that the film bubble is subjected to uniform force during the flattening process and avoids local wrinkles or stretching deformation caused by inconsistent spacing.

[0053] To facilitate the active driving of the guide roller 34 and to cool the guide roller 34, the present invention designs the following structure: (See reference) Figure 1 , Figure 3 , Figure 4 , Figure 5 and Figure 7 The roller assembly 35 includes a linkage frame 351 that is slidably connected to two corresponding plates 331. A roller frame 352 is rotatably mounted on the linkage frame 351. A rubber water bladder 353 is detachably connected to the outside of the roller frame 352. The rubber water bladder 353 is attached to the outer side of the guide roller 34 and is cooled by heat conduction.

[0054] When the film bubble is flattened, the moving linkage frame 351 drives the roller frame 352 to approach the guide roller 34 at the corresponding position, so that the roller frame 352 drives the rubber water bag 353 to abut against and adhere to the outer surface of the guide roller 34. The guide roller 34 squeezes the rubber water bag 353 to form a wrap angle with the guide roller 34. The rubber water bag 353 cools the guide roller 34 through heat conduction. By adjusting the distance between the rubber water bag 353 and the guide roller 34, the size of the wrap angle of the rubber water bag 353 with the guide roller 34 is changed, thereby realizing flexible adjustment of the cooling capacity of the guide roller 34 surface and maintaining the surface temperature of the guide roller 34 between 40℃ and 60℃.

[0055] To facilitate the replacement of the worn and damaged rubber water bladder 353, the present invention is designed with the following structure: (See attached diagram) Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 The roller frame 352 has two extrusion discs 354 threaded on it. When replacing it, remove the roller frame 352, then loosen the extrusion discs 354, then remove the old rubber water bladder 353 from the roller frame 352, then put the new rubber water bladder 353 on the roller frame 352, and then seal the rubber water bladder 353 onto the roller frame 352 by twisting the extrusion discs 354.

[0056] To facilitate adjustment of the wrap angle between the rubber water bladder 353 and the guide roller 34, and to facilitate active driving of the guide roller 34 to rotate, the present invention designs the following structure: (See reference) Figure 4 , Figure 5 , Figure 7 and Figure 8 A hydraulic cylinder 355 is fixedly installed on the linkage frame 351. The telescopic section of the hydraulic cylinder 355 is fixedly connected to the plate 331. A synchronous motor 356 for driving the roller frame 352 to rotate is fixedly installed on the front side of the linkage frame 351.

[0057] By controlling the extension and retraction of the telescopic section of hydraulic cylinder 355, hydraulic cylinder 355 drives the linkage frame 351 to move synchronously, so that the linkage frame 351 drives the roller frame 352 to adjust the distance between it and the corresponding guide roller 34, thereby adjusting the wrap angle of the rubber water bag 353 on the corresponding guide roller 34. When the film bubble is flattened, the synchronous motor 356 drives the roller frame 352 to rotate, so that the roller frame 352 drives the guide roller 34 to rotate actively through the friction of the rubber water bag 353 on the guide roller 34.

[0058] To facilitate cooling of the guide roller 34, the present invention is designed with the following structure: (See attached diagram) Figure 5 , Figure 7 and Figure 8 A water inlet and outlet pipe 357 is fixedly installed on the rear side of the linkage frame 351. The water inlet and outlet pipe 357 is rotatably connected to the roller frame 352 in a sealed manner. The water inlet and outlet pipe 357 consists of an inlet pipe and an outlet pipe. Cooling water is directly introduced into the front part of the roller frame 352 along the inlet pipe. Then, the cooling water moves backward along the axial direction of the roller frame 352 and cools the rubber water bladder 353. Then, the cooling water flows out along the outlet pipe, realizing the unidirectional flow of cooling water in the rubber water bladder 353, thereby enabling the rubber water bladder 353 to cool the guide roller 34.

[0059] Although this invention adds structures such as an electric cylinder 313, a variable pitch screw 332, and a rubber water bladder 353 to the traditional blown film equipment, slightly increasing the initial investment cost, the extension and retraction of the electric cylinder 313 allows for flexible adjustment of the included angle between the two support frames 32, enabling adaptive matching between the flattening path and the upward movement speed of the film bubble, thus preventing wrinkles caused by sudden changes in the path at high speeds. The variable pitch screw 332 ensures uniform spacing between all guide rollers 34, guaranteeing even force distribution during flattening and preventing localized stretching deformation. The rubber water bladder 353 adheres to the guide rollers... The surface of roller 34 forms a wrap angle, which flexibly cools down by heat conduction and actively drives the guide roller 34 to rotate, so that the surface temperature of the guide roller 34 is maintained between 40℃ and 60℃ and the rotation speed is precisely matched with the upward movement speed of the film bubble. This effectively prevents film adhesion and thermal deformation, and realizes the coordinated dynamic control of clamping angle, spacing, bonding driving force and cooling capacity during the flattening process of the film bubble. This significantly improves the film forming quality and production stability, greatly reduces the subsequent losses caused by scrap rate and downtime maintenance, and can quickly recover the additional investment costs in a short period of time through quality improvement and capacity optimization.

Claims

1. A blown film device for polyethylene packaging film, comprising a vertical frame and an extrusion assembly, wherein the extrusion assembly extrudes molten raw material upwards, causing the raw material to form film bubbles, and the vertical frame is provided with a herringbone clamping mechanism for guiding the film bubbles upwards and flattening them to form a double-layer flat film, characterized in that, The herringbone clamp mechanism dynamically adjusts its angle and spacing by monitoring the actual moving speed of the membrane bubble; The herringbone clamping mechanism includes two symmetrically arranged support frames mounted on a vertical frame via a movable component. The movable component dynamically adjusts the included angle between the two support frames according to the upward movement speed of the membrane bubble. Several guide rollers are arranged at equal intervals along the length of the support frame via a sliding component. The sliding component dynamically adjusts the spacing between adjacent guide rollers according to the upward movement speed of the membrane bubble. The herringbone clamping mechanism also includes a roller-adjusting assembly that actively adjusts the rotational speed of the guide roller. The roller-adjusting assembly matches the rotational speed of the guide roller with the actual moving speed of the film bubble, and flexibly cools the surface temperature of the guide roller to a specified range. Based on the actual moving speed of the membrane bubble, the included angle between the two support frames, as well as the spacing, rotation speed, and surface temperature of the guide rollers, are adjusted to perform a uniform flattening operation of the membrane bubble.

2. The blown film equipment for polyethylene packaging film according to claim 1, characterized in that, The moving component includes two hydraulic cylinders fixedly mounted on a vertical frame. Two horizontal plates are horizontally slidably connected to the vertical frame. The horizontal plates are hinged to the corresponding support frames. The telescopic section of the hydraulic cylinders is fixedly connected to the corresponding horizontal plates.

3. The blown film equipment for polyethylene packaging film according to claim 1, characterized in that, The moving assembly also includes two electric cylinders hinged to a vertical frame, with the telescopic sections of the electric cylinders hinged to the support frame.

4. The blown film equipment for polyethylene packaging film according to claim 1, characterized in that, The sliding assembly includes several plates that are slidably connected to both sides of the support frame. Two corresponding plates are rotatably connected to corresponding guide rollers, and the positions of the two uppermost plates on the same support frame are locked.

5. The blown film equipment for polyethylene packaging film according to claim 4, characterized in that, Two variable pitch screws are rotatably mounted on the support frame. The variable pitch screws are threadedly connected to the plates on the corresponding sides. A geared motor that drives the variable pitch screws is fixedly installed on the support frame.

6. The blown film equipment for polyethylene packaging film according to claim 4, characterized in that, The roller assembly includes a linkage frame that is slidably connected to two corresponding plates. A roller frame is rotatably mounted on the linkage frame. A rubber water bladder is detachably connected to the outside of the roller frame. The rubber water bladder is attached to the outer side of the guide roller and cools down through heat conduction.

7. The blown film equipment for polyethylene packaging film according to claim 6, characterized in that, Two extrusion discs are threaded onto the roller frame. By twisting the extrusion discs, the rubber water bag is sealed and adhered to the roller frame.

8. The blown film equipment for polyethylene packaging film according to claim 6, characterized in that, A second hydraulic cylinder is fixedly installed on the linkage frame. The telescopic section of the second hydraulic cylinder is fixedly connected to the plate. A synchronous motor that drives the roller frame to rotate is fixedly installed on the front side of the linkage frame.

9. The blown film equipment for polyethylene packaging film according to claim 6, characterized in that, The linkage frame is fixedly installed with water inlet and outlet pipes, which are rotatably and sealed to the roller frame.

10. The blown film equipment for polyethylene packaging film according to claim 9, characterized in that, The inlet and outlet water pipes introduce cooling water into the front part of the inner side of the roller frame, then the cooling water flows backward, and then the cooling water flows out through the inlet and outlet water pipes.

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