Film blowing mechanism of film blowing machine

Abstract

The utility model relates to the technical field of film blowing machines, and discloses a film blowing mechanism of a film blowing machine, which comprises an extruder, a die head, an air ring, a herringbone plate, a calendering roller, a guide roller and a wind-up roller which are sequentially arranged along the moving direction of a film, and further comprises an automatic roller changing mechanism capable of automatically changing the wind-up roller in a non-stop state, the automatic roll changing mechanism comprises two parallel overturning arms used for installing a wind-up roll, and the middles of the two overturning arms are rotationally connected with a supporting plate of the automatic roll changing mechanism through overturning shafts. After the winding roller is fully wound, the automatic roller replacing mechanism can automatically replace a new winding roller, in the roller replacing process and the new winding roller detaching and replacing process, a production line does not need to be shut down for operation, and production efficiency is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of film blowing machines, and particularly relates to a film blowing mechanism of a film blowing machine. Background Art

[0002] A film blowing machine is used to heat and melt plastic particles and then blow them into a film. Generally, the film blown out by a die head and an air ring is a tubular film, and then a sheet-shaped film product is obtained by a chevron plate, and finally wound by a winding machine.

[0003] However, when replacing the winding drum of the winding machine in the existing film blowing machine, it is necessary to first cut off the film between the winding drum and the guiding roller. After cutting, the film on the production line will be in a slack state. At this time, it is necessary to stop the machine and install a new winding roller, and production can continue only after the installation is completed. When producing again, it is necessary to re-adjust the equipment, which greatly affects the work efficiency.

[0004] The utility model patent with the publication number of CN206733588U discloses a film blowing machine, which includes, in sequence along the film moving direction: an extrusion device, a die head, an air ring, a chevron plate, a calender roll, a guiding roller and a winding machine. The die head, the air ring, the chevron plate, the calender roll and the guiding roller are all arranged on a frame; there are multiple guiding rollers, and each guiding roller is equipped with a pressing plate. The pressing plate is connected with a driving device, so that the pressing plate can be switched between the on-state and the off-state. When the pressing plate is in the on-state, the pressing plate is in a separated state from the guiding roller, and the film directly passes through the guiding roller and the pressing plate. When the pressing plate is in the off-state, the pressing plate abuts against the guiding roller, locks the guiding roller, and presses the film on the surface of the guiding roller; A freely rotatable roller is also arranged between the guiding roller and the winding machine, and the roller is provided with an encoder. Although the film blowing machine provided by this utility model can keep the film on the production line in a tensioned state after cutting off the film between the winding drum and the guiding roller, so that there is no need to re-adjust the equipment when producing again, it still needs to stop the machine when replacing the winding roller, resulting in a still low production efficiency, and urgent improvement is needed. Content of the Utility Model

[0005] The purpose of the utility model is to provide a film blowing mechanism of a film blowing machine. After the winding roller is fully wound, the automatic roller changing mechanism can automatically replace a new winding roller, and during the roller changing process and the disassembly and replacement process of the new winding roller, the production line does not need to stop operating, which greatly improves the production efficiency.

[0006] The above technical purpose of the utility model is achieved through the following technical solutions:

[0007] A film blowing mechanism of a film blowing machine, comprising an extruder, a die head, an air ring, a chevron plate, a calender roll, a guide roll and a winding roll arranged in sequence along the moving direction of the film, and further comprising an automatic roll changing mechanism connected to enable automatic roll changing of the winding roll in a non-stop state. The automatic roll changing mechanism includes two parallel arranged flipping arms for mounting the winding roll, and the middle parts of the two flipping arms are respectively rotationally connected to a support plate of the automatic roll changing mechanism through a rotating shaft.

[0008] By adopting the above technical solution, when the film blowing machine works, a film is jointly formed under the action of the extruder, the die head, the air ring, the chevron plate and the calender roll, guided by the guide roll and then wound by a winder. When the winding roll is full, the automatic roll changing mechanism drives the flipping arm to perform a flipping operation by using the rotating shaft, so as to exchange the positions of the full winding roll and a new winding roll. Therefore, the automatic roll changing operation of the winding roll is realized. After the changing operation is completed, the new winding roll takes over the original winding roll to continue the winding operation, while the original winding roll can be manually disassembled to replace a new winding roll while the new winding roll is performing the winding operation. Repeating like this, during the whole roll changing process, the production line does not need to stop operating, greatly improving the production efficiency.

[0009] A further setting of the present utility model is that: one end of the flipping arm is provided with a winding motor for driving the winding roll to rotate relative to the flipping arm so as to realize the winding operation, and one end of the rotating shaft is connected to a flipping motor fixed on the support plate.

[0010] By adopting the above technical solution, during winding, the winding motor drives the winding roll to rotate relative to the flipping arm, so that the film is continuously wound on the winding roll, thus realizing the winding operation.

[0011] A further setting of the present utility model is that: there are two winding rolls, and the two winding rolls are respectively connected to the two ends of the flipping arm.

[0012] By adopting the above technical solution, the two winding rolls are respectively arranged at the two ends of the flipping arm, which can not only balance the weights at the two ends of the flipping arm, making the stability better during winding and during the process of the flipping arm switching the winding roll by flipping, but also one of the two winding rolls can be used as a spare winding roll when the other winding roll is performing the winding operation, facilitating quick flipping and switching to the other winding roll for winding operation when one winding roll is full, with high efficiency and good reliability.

[0013] A further setting of the present utility model is that: the automatic roll changing mechanism further includes a cutting mechanism for cutting the film during the roll changing process.

[0014] By adopting the above technical solution, the cutting mechanism is used to cut the film during the switching process of the winding roller, so that the full-wound winding roller no longer continues to wind, and the cut film is automatically switched to wind around the replaced winding roller and continue to wind. The whole process is continuous, and the film located on the production line remains in a tensioned state before and after cutting. Not only does it not require shutdown for processing, but also the winding quality remains stable before and after the roller replacement.

[0015] The further setting of the present utility model is that: the cutting mechanism includes a cutting knife parallel to the axis direction of the turning shaft and a cutting pressure plate arranged opposite to the cutting knife. The cutting knife is fixed on the turning shaft, the cutting pressure plate is longitudinally slidably matched with the support plate, and the cutting pressure plate longitudinally slides along the support plate under the drive of the drive mechanism.

[0016] By adopting the above technical solution, when the turning shaft drives the turning arm to turn for the switching operation of the winding roller, the cutting knife fixed on the turning shaft will rotate to the lower part of the film and be directly opposite to the cutting position of the film. At this time, the cutting pressure plate presses the film downward under the drive of the drive mechanism until the cutting position of the film just contacts the cutting knife, thus realizing the cutting operation of the film. The cutting process is simple and the operation is convenient.

[0017] The further setting of the present utility model is that: the drive mechanism includes a drive disk fixedly connected to the other end of the turning shaft. The drive disk is coaxially arranged with the turning shaft. A fixing pin one is arranged on one side of the rotation center of the drive disk, and a fixing pin two is arranged on the cutting pressure plate. The fixing pin one and the fixing pin two are respectively rotatably connected to both ends of the drive rod.

[0018] By adopting the above technical solution, the turning shaft is fixedly connected to the drive disk. Therefore, when the turning shaft rotates to drive the turning arm to turn, it will drive the drive disk to rotate synchronously. When the drive disk rotates, it drives the end of the drive rod rotatably connected to it to rotate synchronously, so that the other end of the drive rod drives the cutting pressure plate to longitudinally slide along the support plate. The cutting pressure plate slides downward during the film cutting operation to press the film down to contact the cutting knife, and slides upward to the initial position after the film cutting operation is completed, ensuring that there is enough space when the winding roller on the turning arm is turned and replaced, avoiding interference with the cutting pressure plate, and effectively ensuring the reliability of the equipment.

[0019] The further setting of the present utility model is that: a cavity is arranged at the bottom of the cutting pressure plate. A piston longitudinally slidably matched with the cavity is arranged in the cavity. One side of the piston close to the cutting knife is fixedly connected to a piston rod. The piston rod penetrates through the cavity and extends out from the bottom of the cutting pressure plate. A return spring is arranged on the other side of the piston away from the cutting knife. One end of the return spring is fixed at the top of the cavity, and the other end of the return spring is fixed on the piston. Through holes are respectively arranged on both side walls of the cavity on the other side of the piston away from the cutting knife.

[0020] By adopting the above technical solution, while the cutting pressure plate presses the film downward, the film contacts the piston rod at the bottom of the cutting pressure plate and applies a certain pressure to the piston rod. As the cutting pressure plate continuously slides downward, the pressure on the piston rod gradually increases. As the pressure on the piston rod continuously increases, the piston rod will continuously push the piston, causing the piston to slide toward the side away from the cutting knife. When the piston slides toward the side away from the cutting knife, the air in the cavity on the side of the piston away from the cutting knife is continuously discharged through the inflation hole and blown onto the film on both sides of the cutting pressure plate. When the film contacts the cutting knife, the two broken ends of the film quickly adhere to the surfaces of the two winding rollers under the impact of the gas discharged from the air holes and rotate at high speed with the two winding rollers respectively. During the high-speed rotation process, the new winding roller can quickly realize the winding operation without additional assistance, and the film on the full-wound winding roller is not easy to loosen during unloading because its end adheres to its surface, effectively ensuring the winding effect.

[0021] A further setting of the present utility model is that: the winding roller is a hollow cylindrical shape, the inner wall at one end of the winding roller is key-connected to the output shaft of the winding motor, the inner wall at the other end of the winding roller is connected to the flipping arm on the same other side thereof through a connecting bolt, and the winding motor is fixed at one end of the flipping arm.

[0022] By adopting the above technical solution, when the winding roller is full and needs to be disassembled from the flipping arm, when the winding roller needs to be disassembled, only the connecting bolt for connecting the winding roller and the flipping arm needs to be disassembled, so that the connecting bolt is separated from the inner wall of the winding roller. At this time, the disassembly operation of the other end of the winding roller and the flipping arm on the same other side thereof is realized, and then the end of the winding roller key-connected to the output shaft of the winding motor can be axially pulled out from the output shaft of the winding motor. When the full-wound winding roller is disassembled, one end of the new winding roller can be first key-connected to the output shaft of the winding motor and then the other end of the new winding roller can be connected to the flipping arm through a connecting bolt. The disassembly and assembly process is simple, the operation is convenient, and since the operation is carried out at one end of the flipping arm, it will not affect the winding operation of the winding roller at the other end of the flipping arm. Therefore, the whole process does not require shutdown operation, further improving the production efficiency.

[0023] A further setting of the present utility model is that: the output shaft of the winding motor is rotatably connected to the flipping arm fixedly connected thereto, and the connecting bolt is rotatably connected to the flipping arm and threadedly connected to the inner wall at the other end of the winding roller.

[0024] By adopting the above technical solution, the winding motor is used to drive the winding roller to rotate relative to the flipping arm, so as to realize the winding operation. When the winding roller and the flipping arm are connected or disassembled by the connecting bolts, it is only necessary to control the connecting bolts to rotate relative to the winding roller. While rotating relative to the winding roller, the connecting bolts will slide along the axial direction of the winding roller, so as to realize the connection or separation between the connecting bolts and the inner wall of the winding roller. By rotating relative to the winding roller, when the winding roller and the flipping arm are connected or disassembled by the connecting bolts, the structure is simple and the operation is convenient.

[0025] The beneficial effects of the present utility model are as follows:

[0026] 1. When the present utility model works, a film is jointly formed under the action of an extruder, a die head, an air ring, a chevron plate and a calender roll, and is guided by a guide roll and then wound by a winder. When the winding roller is full, the automatic roll-changing mechanism drives the flipping arm to perform a flipping operation by using a rotating shaft, so as to exchange the positions of the full winding roller and a new winding roller. Therefore, the automatic replacement operation of the winding roller is realized. After the replacement operation is completed, the new winding roller takes over the original winding roller to continue the winding operation, while the original winding roller can be manually disassembled to replace a new winding roller while the new winding roller is performing the winding operation. Repeating like this, during the whole roll-changing process, the production line does not need to stop operating, which greatly improves the production efficiency.

[0027] 2. In the present utility model, the two winding rollers are respectively arranged at both ends of the flipping arm, which can not only balance the weights at both ends of the flipping arm, making the stability better during the winding process and when the flipping arm switches the winding roller by flipping, but also one of the two winding rollers can be used as a spare winding roller when the other winding roller is performing the winding operation, which is convenient for quickly flipping and switching to the other winding roller for winding operation when one winding roller is full, with high efficiency and good reliability.

[0028] 3. The present utility model cuts off the film during the winding roller switching process through a cutting mechanism, so that the full winding roller no longer continues to wind, and the cut film is automatically switched to be wound around the replaced winding roller to continue winding. The whole process is continuous, and the film located on the production line remains in a tensioned state before and after cutting. Not only does it not need to stop for treatment, but also the winding quality remains stable before and after roll changing.

[0029] 4. In the present utility model, the turnover shaft is fixedly connected to the driving disk. When the turnover shaft rotates to drive the turnover arm to turn over, it will drive the driving disk to rotate synchronously. When the driving disk rotates, it drives the end of the driving rod connected to it to rotate synchronously, so that the other end of the driving rod drives the cutting pressure plate to slide longitudinally along the support plate. When the film is cut, the cutting pressure plate slides downward to press the film down until it contacts the cutting knife. After the film cutting operation is completed, it slides upward to the initial position, ensuring that there is enough space when the winding roller on the turnover arm is turned over and replaced, avoiding interference with the cutting pressure plate, and effectively ensuring the reliability of the equipment.

[0030] 5. When the cutting pressure plate presses the film downward in the present utility model, the film contacts the piston rod at the bottom of the cutting pressure plate and applies a certain pressure to the piston rod. As the cutting pressure plate slides downward continuously, the pressure on the piston rod gradually increases. As the pressure on the piston rod increases continuously, the piston rod will continuously push the piston, causing the piston to slide toward the side away from the cutting knife. When the piston slides toward the side away from the cutting knife, the air in the cavity on the side of the piston away from the cutting knife is continuously discharged through the inflation hole under the extrusion of the piston and blown toward the film on both sides of the cutting pressure plate, so that when the film contacts the cutting knife instantaneously, the two broken ends of the film are quickly pressed against the surfaces of the two winding rollers under the impact of the gas discharged from the air holes and rotate at high speed with the two winding rollers respectively. During the high-speed rotation process, the new winding roller can quickly achieve the winding operation without additional assistance, and the film on the full-roll winding roller is not easy to loosen during unloading because its end is pressed against its surface, effectively ensuring the winding effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0032] Figure 1 It is a three-dimensional structural schematic diagram of the automatic roll-changing mechanism in the film blowing mechanism of a film blowing machine of the present utility model.

[0033] Figure 2 It is a sectional structural schematic diagram of the automatic roll-changing mechanism in the film blowing mechanism of a film blowing machine of the present utility model when performing the winding operation.

[0034] Figure 3 is Figure 2 The partial enlarged schematic diagram of A in

[0035] Figure 4It is a schematic cross-sectional structure diagram when the automatic roll-changing mechanism in the film blowing mechanism of a film blowing machine of the present utility model rotates 90° during the roll-changing operation.

[0036] Figure 5 It is a schematic cross-sectional structure diagram when the automatic roll-changing mechanism in the film blowing mechanism of a film blowing machine of the present utility model rotates 180° during the roll-changing operation.

[0037] Figure 6 It is a schematic connection structure diagram of the winding roll and the automatic roll-changing mechanism in the film blowing mechanism of a film blowing machine of the present utility model.

[0038] In the figure, 1 is the winding roll; 2 is the automatic roll-changing mechanism; 201 is the flipping arm; 202 is the flipping shaft; 203 is the support plate; 204 is the winding motor; 205 is the flipping motor; 206 is the connecting bolt; 3 is the cutting mechanism; 301 is the cutting knife; 302 is the cutting pressure plate; 303 is the cavity; 304 is the piston; 305 is the piston rod; 306 is the return spring; 307 is the air hole; 4 is the driving mechanism; 401 is the driving disk; 402 is the first fixing pin; 403 is the second fixing pin; 404 is the driving rod. Specific embodiments

[0039] Next, the technical solutions of the present utility model will be clearly and completely described in conjunction with specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0040] As Figures 1 to 6 shown, a film blowing mechanism of a film blowing machine includes an extruder, a die head, an air ring, a chevron plate, a calender roll, a guide roll, and a winding roll 1 arranged in sequence along the moving direction of the film. It also includes an automatic roll-changing mechanism 2 that can automatically replace the winding roll 1 without stopping the machine. The automatic roll-changing mechanism 2 includes two parallel flipping arms 201 for installing the winding roll 1. The middle parts of the two flipping arms 201 are rotatably connected to the support plate 203 of the automatic roll-changing mechanism 2 through a flipping shaft 202.

[0041] Furthermore, one end of the flipping arm 201 is provided with a winding motor 204 for driving the winding roll 1 to rotate relative to the flipping arm 201 so as to realize the winding operation. One end of the flipping shaft 202 is connected to the flipping motor 205 fixed on the support plate 203.

[0042] Furthermore, there are two winding rolls 1, and the two winding rolls 1 are respectively connected to the two ends of the flipping arm 201.

[0043] Further, the automatic roll changing mechanism 2 further includes a cutting mechanism 3 for cutting the film during the roll changing process.

[0044] Further, the cutting mechanism 3 includes a cutting knife 301 parallel to the axis direction of the turning shaft 202 and a cutting pressure plate 302 disposed opposite to the cutting knife 301. The cutting knife 301 is fixed on the turning shaft 202, the cutting pressure plate 302 is longitudinally slidably engaged with the support plate 203, and the cutting pressure plate 302 longitudinally slides along the support plate 203 under the drive of the drive mechanism 4.

[0045] Further, the drive mechanism 4 includes a drive disk 401 fixedly connected to the other end of the turning shaft 202. The drive disk 401 is coaxially arranged with the turning shaft 202. A first fixing pin 402 is provided on one side of the rotation center of the drive disk 401, and a second fixing pin 403 is provided on the cutting pressure plate 302. The first fixing pin 402 and the second fixing pin 403 are respectively rotatably connected to both ends of a drive rod 404.

[0046] Further, a cavity 303 is provided at the bottom of the cutting pressure plate 302. A piston 304 longitudinally slidably engaged with the cavity 303 is provided in the cavity 303. One side of the piston 304 close to the cutting knife 301 is fixedly connected to a piston rod 305. The piston rod 305 penetrates through the cavity 303 and extends out from the bottom of the cutting pressure plate 302. A return spring 306 is provided on the other side of the piston 304 away from the cutting knife 301. One end of the return spring 306 is fixed to the top of the cavity 303, and the other end of the return spring 306 is fixed to the piston 304. Through holes 307 are respectively provided on both side walls of the cavity 303 on the other side of the piston 304 away from the cutting knife 301.

[0047] Further, the winding roll 1 is a hollow cylindrical shape. The output shaft of a winding motor 204 is key-connected to the inner wall of one end of the winding roll 1. The inner wall of the other end of the winding roll 1 is connected to the turning arm 201 on the same other side thereof through a connecting bolt 206. The winding motor 204 is fixed to one end of the turning arm 201.

[0048] Further, the output shaft of the winding motor 204 is rotatably connected to the turning arm 201 fixedly connected thereto. The connecting bolt 206 is rotatably connected to the turning arm 201 and threadedly connected to the inner wall of the other end of the winding roll 1.

[0049] Working principle of the utility model: When the blown film machine is working, a film is jointly formed under the action of an extruder, a die head, an air ring, a chevron plate and a calender roll, and is guided by a guide roll and then wound by a rewinder. During winding, the winding motor 204 drives the winding roll 1 to rotate relative to the flipping arm 201, so that the film is continuously wound on the winding roll 1; when the winding roll 1 is full, the automatic roll changing mechanism 2 drives the flipping arm 201 to perform a flipping operation by using the flipping shaft 202, so as to exchange the positions of the full winding roll 1 and a new winding roll 1. During the roll changing operation, the cutting mechanism 3 cuts the film during the switching process of the winding roll 1, so that the full winding roll 1 no longer continues to wind, and the cut film is automatically switched to be wound on the replaced winding roll 1 to continue winding. The film located on the production line before and after cutting always remains in a tensioned state, not only does not require shutdown treatment, but also the winding quality before and after roll changing always remains stable, that is: when the flipping shaft 202 drives the flipping arm 201 to flip for the switching operation of the winding roll 1, the cutting knife 301 fixed on the flipping shaft 202 will rotate below the film and be aligned with the cutting position of the film. At this time, the cutting pressure plate 302 presses the film downward under the drive of the driving mechanism 4. While the cutting pressure plate 302 presses the film downward, the film contacts the piston rod 305 at the bottom of the cutting pressure plate 302 and applies a certain pressure to the piston rod 305. As the cutting pressure plate 302 continuously slides down, the pressure received by the piston rod 305 gradually increases. As the pressure received by the piston rod 305 continuously increases, the piston rod 305 will continuously push the piston 304, so that the piston 304 slides to the side away from the cutting knife 301. When the piston 304 slides to the side away from the cutting knife 301, the air in the cavity on the side of the piston 304 away from the cutting knife 301 is continuously discharged through the air charging hole 307 and blown to the film on both sides of the cutting pressure plate 302, so that when the film contacts the cutting knife 301, the two fracture ends of the film are quickly attached to the surfaces of the two winding rolls 1 under the impact of the gas discharged from the air holes 307 and rotate at high speed respectively with the two winding rolls 1. During the high-speed rotation process, the new winding roll 1 can quickly realize the winding operation without additional assistance, and the film on the full winding roll 1 is not easy to loosen during unloading because its end is attached to its surface, effectively ensuring the winding effect; after the replacement operation of the winding roll 1 is completed, the new winding roll 1 takes over the original winding roll 1 to continue the winding operation, and the original winding roll 1 can be manually disassembled and replaced with a new winding roll 1 while the new winding roll 1 is performing the winding operation. Repeating like this, the production line does not need to stop during the roll changing process, greatly improving the production efficiency.

Claims

1. The film blowing mechanism of a film blowing machine, comprising an extruder, a die head, an air ring, a chevron plate, a calender roll, a guide roll and a winding roll (1) sequentially arranged along the moving direction of the film, characterized in that: It also includes an automatic roll changing mechanism (2) connected to the rewinding roll (1) that can be automatically changed under non-stop operation. The automatic roll changing mechanism (2) includes two parallelly arranged flipping arms (201) for mounting the rewinding roll (1). The middle parts of the two flipping arms (201) are rotatably connected to the support plate (203) of the automatic roll changing mechanism (2) through a flipping shaft (202).

2. The film blowing mechanism of a film blowing machine according to claim 1, characterized in that: One end of the flipping arm (201) is provided with a rewinding motor (204) for driving the rewinding roll (1) to rotate relative to the flipping arm (201) so as to realize the rewinding operation. One end of the flipping shaft (202) is connected to the flipping motor (205) fixed on the support plate (203).

3. The film blowing mechanism of a film blowing machine according to claim 2, characterized in that: There are two rewinding rolls (1), and the two rewinding rolls (1) are respectively connected to the two ends of the flipping arm (201).

4. The film blowing mechanism of a film blowing machine according to claim 3, characterized in that: The automatic roll changing mechanism (2) also includes a cutting mechanism (3) for cutting the film during the roll changing process.

5. The film blowing mechanism of a film blowing machine according to claim 4, characterized in that: The cutting mechanism (3) includes a cutting knife (301) parallel to the axis direction of the flipping shaft (202) and a cutting pressure plate (302) arranged opposite to the cutting knife (301). The cutting knife (301) is fixed on the flipping shaft (202). The cutting pressure plate (302) is longitudinally slidably matched with the support plate (203), and the cutting pressure plate (302) longitudinally slides along the support plate (203) under the drive of the drive mechanism (4).

6. The film blowing mechanism of a film blowing machine according to claim 5, characterized in that: The drive mechanism (4) includes a drive disk (401) fixedly connected to the other end of the flipping shaft (202). The drive disk (401) is coaxially arranged with the flipping shaft (202). One side of the rotation center of the drive disk (401) is provided with a fixing pin one (402). The cutting pressure plate (302) is provided with a fixing pin two (403). The fixing pin one (402) and the fixing pin two (403) are respectively rotatably connected to the two ends of the drive rod (404).

7. The film blowing mechanism of a film blowing machine according to claim 6, characterized in that: The bottom of the cutting pressure plate (302) is provided with a cavity (303). A piston (304) longitudinally slidably matched with the cavity (303) is arranged in the cavity (303). One side of the piston (304) close to the cutting knife (301) is fixedly connected to a piston rod (305). The piston rod (305) penetrates through the cavity (303) and extends out from the bottom of the cutting pressure plate (302). One side of the piston (304) far from the cutting knife (301) is provided with a return spring (306). One end of the return spring (306) is fixed on the top of the cavity (303), and the other end of the return spring (306) is fixed on the piston (304). Through holes (307) are respectively arranged on both side walls of the cavity (303) on the side of the piston (304) far from the cutting knife (301).

8. The film blowing mechanism of a film blowing machine according to claim 2, characterized in that: The rewinding roll (1) is a hollow cylindrical shape. The inner wall of one end of the rewinding roll (1) is key-connected to the output shaft of the rewinding motor (204). The inner wall of the other end of the rewinding roll (1) is connected to the flipping arm (201) on the same other side through a connecting bolt (206). The rewinding motor (204) is fixed on one end of the flipping arm (201).

9. The film blowing mechanism of a film blowing machine according to claim 8, characterized in that: The output shaft of the winding motor (204) is rotationally connected to the flipping arm (201) fixedly connected thereto, and the connecting bolt (206) is rotationally connected to the flipping arm (201) and threadedly connected to the inner wall at the other end of the winding roller (1).

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