CN118752757A - Antibacterial PE film blow molding equipment and blow molding method with high ductility - Google Patents

Abstract

The present invention relates to the technical field of PE film blowing, and in particular to an antibacterial PE film blowing equipment with high ductility, comprising a die head, a connecting part, a central tube, an air supply part, an adjusting part and a plurality of nozzles, wherein: a first cavity is provided in a base, a second cavity is provided in a die head, the die head also has a forming groove arranged in an annular manner from outside to inside and a plurality of first vent holes evenly distributed in three layers of annular manner, the third layer has 16 first vent holes, the second layer has 8 first vent holes, and the first layer has 4 first vent holes; the connecting part comprises a first annular block, a second annular block and a third annular block rotatably arranged in the second cavity, the three annular blocks are slidably connected, and the distance ratio between the center of the second vent hole on the third annular block, the second annular block and the first annular block to the corresponding center of the three annular blocks is 1.5:1.5:1. The present invention improves the adjustment range of the ductility of the PE film and meets the production demand for higher ductility.

Description

Antibacterial PE film blow molding equipment and blow molding method with high ductility

Technical Field

The invention relates to the technical field of PE film blow molding, and in particular to an antibacterial PE film blow molding device and a blow molding method with high ductility.

Background Art

PE film is a packaging film made of polyethylene as the main material. It is safe and non-toxic and is mainly used to package food. PE film is obtained by blow molding equipment.

The patent with application number 202210617615.3 discloses a blow molding method and blow molding equipment for an antibacterial PE cling film with high ductility. The components of the cling film include polyethylene resin, calcium carbonate, iodinated chitosan glue, gelatin glue, graphene, hyaluronic acid glue, antioxidant, antistatic masterbatch, plasticizer, and light stabilizer; it is produced by debugging, raw material mixing hot melting, material transfer, and winding processes. The produced cling film not only has excellent ductility, but also has antibacterial properties; the blow molding equipment includes a stand, a molding box, an extrusion structure, a blowing mechanism, a clamping mechanism, and a winding mechanism. The cling film produced by the above equipment and process has the functions of extrusion, blowing, and rotation. The rotation speed of the reel, the opening and closing degree of the herringbone plate group, and the inclination angle of the air nozzle can be simultaneously connected by adjusting the shaft.

The inventors found that the above-mentioned device only adjusts the ductility of the PE film by adjusting the angle of the air nozzle during operation, and the adjustment range is limited, which cannot meet the production needs of higher ductility.

Summary of the invention

In view of this, the purpose of the present invention is to propose an antibacterial PE film blow molding equipment and blow molding method with high ductility, so as to solve the problem that the existing equipment only adjusts the ductility of the PE film by adjusting the angle of the air nozzle during operation, the adjustment range is limited, and it cannot meet the production requirements of higher ductility.

Based on the above purpose, the present invention provides an antibacterial PE film blowing device with high ductility, including a base, a die head, a connecting part, a central tube, an air supply part, an adjustment part and a plurality of nozzles, wherein:

The base has a first cavity inside and an exhaust port on the base;

The central tube is arranged at the center of the base and passes through the die head;

The die head is arranged on the top of the base, and a second cavity is provided in the die head. The die head also has a forming groove arranged in an annular shape from the outside to the inside and a plurality of first vent holes evenly distributed in three layers of annular shapes, wherein the third layer has 16 first vent holes, the second layer has 8 first vent holes, and the first layer has 4 first vent holes;

The connecting portion comprises a first annular block, a second annular block and a third annular block rotatably arranged in the second cavity, the three annular blocks are slidably connected to each other, the third annular block has 16 second vents corresponding to the 16 first vents in the third layer, the second annular block has 8 second vents corresponding to the 8 first vents in the second layer, the first annular block has 4 second vents corresponding to the 4 first vents in the first layer, and the distance ratio between the center of the second vents on the third annular block, the second annular block and the first annular block and the corresponding center of the three annular blocks is 1.5:1.5:1;

A plurality of the nozzles are annularly distributed at the upper end of the central tube, the nozzles are hinged to the central tube, the adjustment part is used to adjust the angle of the nozzles, and the air supply part is used to provide compressed air to the nozzles;

Initially, all of the first ventilation holes are connected to the corresponding second ventilation holes. By controlling the three annular blocks to rotate the same predetermined arc length, the connection status of the second ventilation holes on the first annular block, the second annular block and the third annular block and the corresponding first ventilation holes is adjusted.

Optionally, controlling the three annular blocks to rotate by the same arc length to adjust the connection state between the second vent holes on the first annular block, the second annular block and the third annular block and the corresponding first vent holes includes:

When the three annular blocks are controlled to rotate with the same arc length L1, the first annular block rotates 90 degrees, the second vent holes on the first annular block are connected with the corresponding first vent holes, and the second vent holes on the second annular block and the third annular block are not connected with the corresponding first vent holes;

When the three annular blocks are controlled to rotate to the same arc length L2, the second annular block rotates 45 degrees, the second vent hole on the second annular block is connected to the corresponding first vent hole, and the second vent holes on the first annular block and the third annular block are not connected to the corresponding first vent holes;

When the three annular blocks are controlled to rotate with the same arc length L3, the third annular block rotates 22.5 degrees, the second vent hole on the third annular block is connected with the corresponding first vent hole, and the second vent holes on the second annular block and the first annular block are not connected with the corresponding first vent holes;

When the three annular blocks are controlled to rotate with the same arc length L4, the first annular block rotates 270 degrees, the second vents on the first and second annular blocks are connected to the corresponding first vents, and the second vent on the third annular block is not connected to the corresponding first vent.

Optionally, the blow molding equipment further includes a driving part and a transmission part, wherein the driving part is transmission-connected to the first annular block, the second annular block and the third annular block via the transmission part, and the driving part drives the three annular blocks to rotate with the same arc length.

Optionally, the transmission part includes a third connecting rod arranged at the bottom of the third annular block, and a third gear ring is provided at the bottom of two of the third connecting rods; a second connecting rod arranged at the bottom of the second annular block, and a second gear ring is provided at the bottom of two of the second connecting rods; and a first connecting rod arranged at the bottom of the first annular block, and a first gear ring is provided at the bottom of two of the first connecting rods.

Optionally, the driving unit includes a first electric cylinder, a connecting block is provided on the telescopic rod of the first electric cylinder, and three racks are provided on the connecting block, and the three racks are respectively engaged with the first gear ring, the second gear ring and the third gear ring.

Optionally, the air supply part includes a first air pipe, the first air pipe passes through the base and the central pipe to be connected with a vertically arranged second air pipe, and the second air pipe is connected with the multiple nozzles through multiple hoses.

Optionally, the adjustment part includes a second electric cylinder and a spring arranged in the central tube, a connecting rod is provided on the telescopic rod of the second electric cylinder, a cross bar is provided on the top of the connecting rod, the cross bar passes through the central tube and is slidably connected to the central tube, a cylinder is surrounded by the cross bar, the top of the cylinder is in contact with the plurality of nozzles, one end of the spring is provided on the nozzle, and the other end is provided on the central tube, and the working angle of the nozzle is controlled by the lifting and lowering movement of the cylinder in conjunction with the spring.

Optionally, the first electric cylinder and the second electric cylinder are both electrically connected to a controller, and the controller controls the second electric cylinder to shorten a predetermined length based on the three annular blocks rotating to the same predetermined arc length.

Based on the same invention, the present invention also provides a blow molding method of an antibacterial PE film blow molding device with high ductility, comprising:

The raw material is extruded through the forming groove to form a film, and then pulled by an external traction device. The compressed air is provided by the air supply part and sprayed from the nozzle into the film, so that the film forms a cylindrical structure under the blowing of the compressed air;

When the ductility of the film needs to be adjusted, the angle of the nozzle is adjusted through the adjustment part to control the direction of the compressed air spraying;

By setting the number of second air holes on each annular block, the center angle formed between two adjacent second air holes is made a constant value. Then, by designing the distance ratio between the center of the second air holes on the third annular block, the second annular block and the first annular block to the corresponding center of the three annular blocks is 1.5:1.5:1, and by controlling the three annular blocks to rotate with the same predetermined arc length, the second air holes on one of the first annular block, the second annular block and the third annular block are connected to the first air holes, and the second air holes on the other annular blocks are not connected to the first air holes. In this way, by adjusting the number of connected second air holes and first air holes, the amount of compressed air discharged can be adjusted, and then the amount of compressed air in the film can be adjusted to further adjust the ductility of the film.

When the blow molding equipment is working, the raw material is extruded through the molding groove to form a film. The raw material may contain iodinated chitosan glue, which is used to enhance the antibacterial activity. The raw material is then towed by an external traction device, and compressed air is provided by the air supply unit to be sprayed from the nozzle into the film, so that the film forms a cylindrical structure under the inflation of the compressed air. When it is necessary to adjust the ductility of the film, on the one hand, the angle of the nozzle can be adjusted by the adjustment unit to control the direction of the compressed air spraying. When the angle between the nozzle and the horizontal plane is smaller, the ductility of the blown film is higher. On the other hand, there is compressed air in the film, and a part of the compressed air flows into the first cavity through the first air vent and the second air vent, and then is discharged from the exhaust port. This reduces the amount of compressed air flowing out of the first air vent, thereby increasing the amount of compressed air in the film, which can further The ductility of the film is further improved. Optionally, by setting the number of second air holes on each annular block, the center angle formed between two adjacent second air holes is a constant value. Then, the distance ratio between the center of the second air holes on the third annular block, the second annular block and the first annular block and the corresponding center of the three annular blocks is designed to be 1.5:1.5:1. By controlling the three annular blocks to rotate with the same predetermined arc length, the second air holes on one of the first annular block, the second annular block and the third annular block can be connected to the first air holes, and the second air holes on the other annular blocks are not connected to the first air holes. In this way, by adjusting the number of connected second air holes and first air holes, the amount of compressed air discharged can be adjusted, and then the amount of compressed air in the film can be adjusted to further adjust the ductility of the film.

From the above, it can be seen that the present invention can not only adjust the ductility of the film by adjusting the angle of the nozzle, but also further adjust the ductility of the film by controlling the amount of compressed air in the film, thereby improving the adjustment range of the ductility of the PE film and meeting the production needs of higher ductility.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

FIG1 is a schematic structural diagram of a blow molding device according to an embodiment of the present invention;

FIG2 is a top view of three annular blocks according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of an air supply unit according to an embodiment of the present invention.

The numbers in the figure are:

1. Base; 2. Die head; 3. Center tube; 4. Nozzle; 5. Exhaust port; 6. Forming groove; 7. First vent hole; 8. First annular block; 9. Second annular block; 10. Third annular block; 11. First connecting rod; 12. Second connecting rod; 13. Third connecting rod; 14. First gear ring; 15. Second gear ring; 16. Third gear ring; 17. First air pipe; 18. Second air pipe; 19. Hose; 20. Second electric cylinder; 21. Spring; 22. Connecting rod; 23. Cross bar; 24. Cylinder; 25. Connecting block; 26. Rack; 27. Second vent hole.

DETAILED DESCRIPTION

In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

As shown in FIG. 1 and FIG. 2 , an antibacterial PE film blowing device with high ductility includes a base 1, a die head 2, a connecting part, a central tube 3, an air supply part, an adjustment part and a plurality of nozzles 4, wherein:

The base 1 has a first cavity inside and an exhaust port 5 on the base 1;

The central tube 3 is arranged at the center of the base 1 and passes through the die head 2;

The die head 2 is arranged on the top of the base 1, and has a second cavity in the die head 2. The die head 2 also has a molding groove 6 arranged in an annular shape from the outside to the inside and a plurality of first vent holes 7 evenly distributed in three layers of annular shapes. The third layer has 16 first vent holes 7, the second layer has 8 first vent holes 7, and the first layer has 4 first vent holes 7;

The connecting portion includes a first annular block 8, a second annular block 9 and a third annular block 10 which are rotatably arranged in the second cavity, and the three annular blocks are slidably connected with each other. The third annular block 10 has 16 second vent holes 27 corresponding to the 16 first vent holes 7 of the third layer, the second annular block 9 has 8 second vent holes 27 corresponding to the 8 first vent holes 7 of the second layer, and the first annular block 8 has 4 second vent holes 27 corresponding to the 4 first vent holes 7 of the first layer. The distance ratio between the center of the second vent holes 27 on the third annular block 10, the second annular block 9 and the first annular block 8 and the corresponding center of the three annular blocks is 1.5:1.5:1.

A plurality of the nozzles 4 are annularly distributed at the upper end of the central tube 3, the nozzles 4 are hinged to the central tube 3, the adjustment part is used to adjust the angle of the nozzles 4, and the air supply part is used to provide compressed air to the nozzles 4;

Initially, all of the first air holes 7 are connected to the corresponding second air holes 27. By controlling the three annular blocks to rotate by the same predetermined arc length, the connection state between the second air holes 27 on the first annular block 8, the second annular block 9 and the third annular block 10 and the corresponding first air holes 7 is adjusted.

When the blow molding equipment is working, the raw material is extruded through the molding groove 6 to form a film. The raw material may contain iodinated chitosan glue, which is used to enhance the antibacterial activity. The raw material is then towed by an external traction device, and compressed air is provided by the air supply section to be sprayed from the nozzle 4 into the film, so that the film forms a cylindrical structure under the inflation of the compressed air. When it is necessary to adjust the ductility of the film, on the one hand, the angle of the nozzle 4 can be adjusted by the adjustment section to control the direction of the compressed air spraying. When the angle between the nozzle 4 and the horizontal plane is smaller, the ductility of the blown film is higher. On the other hand, there is compressed air in the film, and a part of the compressed air flows into the first cavity through the first air vent 7 and the second air vent 27, and then is discharged from the exhaust port 5. This reduces the amount of compressed air flowing out of the first air vent 7, thereby increasing the amount of compressed air in the film, which can further enhance the film. Ductility, optionally, by setting the number of second air holes 27 on each annular block, the center angle formed between two adjacent second air holes 27 is a constant value, and then the distance ratio between the center of the second air holes 27 on the third annular block 10, the second annular block 9 and the first annular block 8 and the corresponding center of the three annular blocks is designed to be 1.5:1.5:1. By controlling the three annular blocks to rotate with the same predetermined arc length, it is possible to make the second air holes 27 on one of the first annular block 8, the second annular block 9 and the third annular block 10 connected with the first air hole 7, and the second air holes 27 on the other annular blocks are not connected with the first air hole 7. In this way, by adjusting the number of connected second air holes 27 and the first air holes 7, the amount of compressed air discharged can be adjusted, and then the amount of compressed air in the film can be adjusted to further adjust the ductility of the film.

From the above, it can be seen that the present invention can not only adjust the ductility of the film by adjusting the angle of the nozzle 4, but also further adjust the ductility of the film by controlling the amount of compressed air in the film, thereby improving the adjustment range of the ductility of the PE film and meeting the production needs of higher ductility.

In some embodiments, the adjusting of the connection state between the second vent holes 27 on the first annular block 8, the second annular block 9 and the third annular block 10 and the corresponding first vent holes 7 by controlling the three annular blocks to rotate to the same arc length includes:

When the three annular blocks are controlled to rotate with the same arc length L1, the first annular block 8 rotates 90 degrees, and the second vent hole 27 on the first annular block 8 is connected with the corresponding first vent hole 7, while the second vent holes 27 on the second annular block 9 and the third annular block 10 are not connected with the corresponding first vent holes 7;

When the three annular blocks are controlled to rotate with the same arc length L2, the second annular block 9 rotates 45 degrees, and the second vent hole 27 on the second annular block 9 is connected with the corresponding first vent hole 7, while the second vent holes 27 on the first annular block 8 and the third annular block 10 are not connected with the corresponding first vent holes 7;

When the three annular blocks are controlled to rotate with the same arc length L3, the third annular block 10 rotates 22.5 degrees, and the second vent hole 27 on the third annular block 10 is connected with the corresponding first vent hole 7, and the second vent holes 27 on the second annular block 9 and the first annular block 8 are not connected with the corresponding first vent holes 7;

When the three annular blocks are controlled to rotate with the same arc length L4, the first annular block 8 rotates 270 degrees, and the second vent holes 27 on the first annular block 8 and the second annular block 9 are connected to the corresponding first vent holes 7, and the second vent holes 27 on the third annular block 10 are not connected to the corresponding first vent holes 7.

When only the second vent 27 on the first annular block 8 is connected to the corresponding first vent 7, the number of the connected first vents 7 is 4, the compressed air discharged is the least, and the compressed air in the film is the most. When only the second vent 27 on the second annular block 9 is connected to the corresponding first vent 7, the number of the connected first vent 7 is 8, and the compressed air discharged is more. When only the second vent 27 on the third annular block 10 is connected to the corresponding first vent 7, the number of the connected first vent 7 is 16, and the compressed air discharged is the most. When the second vent 27 on the first annular block 8 and the second annular block 9 is connected to the corresponding first vent 7, and the second vent 27 on the third annular block 10 is not connected to the corresponding first vent 7, the number of the connected first vent 7 is 12, and the compressed air discharged is less than the least. When a new adjustment is needed, the three annular blocks are first restored to their initial positions. The above control method can achieve 4 modes of adjustment.

In some embodiments, the blow molding equipment further includes a driving part and a transmission part. The driving part is connected to the first annular block 8, the second annular block 9 and the third annular block 10 through the transmission part, and the driving part drives the three annular blocks to rotate with the same arc length.

Optionally, the transmission part includes a third connecting rod 13 arranged at the bottom of the third annular block 10, and the bottoms of the two third connecting rods 13 are provided with a third gear ring 16, and also includes a second connecting rod 12 arranged at the bottom of the second annular block 9, and the bottoms of the two second connecting rods 12 are provided with a second gear ring 15, and also includes a first connecting rod 11 arranged at the bottom of the first annular block 8, and the bottoms of the two first connecting rods 11 are provided with a first gear ring 14. Optionally. The driving part includes a first electric cylinder, and a connecting block 25 is provided on the telescopic rod of the first electric cylinder, and three racks 26 are provided on the connecting block 25, and the three racks 26 are respectively engaged with the first gear ring 14, the second gear ring 15 and the third gear ring 16. Optionally, the specific positions of the first connecting rod 11, the second connecting rod 12 and the third connecting rod 13 can be adjusted according to actual conditions to avoid interference with the moving rack 26, or the rack 26 can be moved forward, backward, left and right with the first electric cylinder, so that after moving a certain distance, if interference occurs, the rack 26 can be moved to adjust the rack 26 to the initial position.

During operation, the first electric cylinder drives the connecting block 25 to move, the connecting block 25 drives the three racks 26 to move, and the three racks 26 respectively drive the first gear ring 14, the second gear ring 15 and the third gear ring 16 to rotate, thereby driving the three annular blocks to rotate the same predetermined arc length.

As shown in FIG3 , in some embodiments, the air supply unit includes a first air pipe 17, the first air pipe 17 passes through the base 1 and the central pipe 3 and is connected to a vertically arranged second air pipe 18, and the second air pipe 18 is respectively connected to the plurality of nozzles 4 through a plurality of hoses 19. When working, an external compressed air device delivers compressed air to the first air pipe 17, and then the compressed air flows into the nozzle 4 through the second air pipe 18 and the hose 19 and is sprayed out from the nozzle 4.

In some embodiments, the adjusting part includes a second electric cylinder 20 and a spring 21 arranged in the central tube 3, a connecting rod 22 is provided on the telescopic rod of the second electric cylinder 20, a cross bar 23 is provided on the top of the connecting rod 22, the cross bar 23 passes through the central tube 3 and is slidably connected to the central tube 3, a cylinder 24 is surrounded on the cross bar 23, the top of the cylinder 24 is in contact with the plurality of nozzles 4, one end of the spring 21 is arranged on the nozzle 4, and the other end is arranged on the central tube 3, and the working angle of the nozzle 4 is controlled by the lifting and lowering movement of the cylinder 24 in cooperation with the spring 21.

When the adjustment part is working, the connecting rod 22 is driven to descend or ascend through the operation of the second electric cylinder 20. When the connecting rod 22 descends, the cylinder 24 is driven to descend through the cross bar 23. At this time, the limit point of the cylinder 24 on the nozzle 4 moves downward relative to the nozzle 4. Under the action of the spring 21, the angle between the nozzle 4 and the horizontal plane decreases. When the connecting rod 22 rises, the cylinder 24 is driven to rise through the cross bar 23. At this time, the limit point of the cylinder 24 on the nozzle 4 moves upward relative to the nozzle 4. The nozzle 4 overcomes the action of the spring 21 and the angle between the horizontal plane increases.

In some embodiments, the first electric cylinder and the second electric cylinder 20 are both electrically connected to a controller, and the controller controls the second electric cylinder 20 to extend or shorten a predetermined length based on the three annular blocks rotating to the same predetermined arc length.

In this embodiment, the extension or shortening of the second electric cylinder 20 can be controlled by controlling the three annular blocks to rotate to the same predetermined arc length, which makes the operation more convenient and quick.

In order to further implement the present invention, the present invention also provides a blow molding method of an antibacterial PE film blow molding device with high ductility, comprising:

The raw material is extruded through the forming groove 6 to form a film, and then pulled by an external pulling device, and compressed air is provided by the air supply part and sprayed from the nozzle 4 into the film, so that the film is blown into a cylindrical structure by the compressed air;

When the ductility of the film needs to be adjusted, the angle of the nozzle 4 is adjusted through the adjustment part to control the direction in which the compressed air is ejected;

By setting the number of second air holes 27 on each annular block, the center angle formed between two adjacent second air holes 27 is made a constant value. Then, the distance ratio between the center of the second air holes 27 on the third annular block 10, the second annular block 9 and the first annular block 8 and the corresponding center of the three annular blocks is designed to be 1.5:1.5:1. By controlling the three annular blocks to rotate with the same predetermined arc length, the second air holes 27 on one of the first annular block 8, the second annular block 9 and the third annular block 10 are connected to the first air hole 7, and the second air holes 27 on the other annular blocks are not connected to the first air hole 7. In this way, by adjusting the number of connected second air holes 27 and the first air holes 7, the amount of compressed air discharged can be adjusted, and then the amount of compressed air in the film can be adjusted to further adjust the ductility of the film.

In this method, not only can the ductility of the film be adjusted by adjusting the angle of the nozzle 4, but the ductility of the film can also be further adjusted by controlling the amount of compressed air in the film, thereby improving the adjustment range of the ductility of the PE film and meeting the production needs of higher ductility.

It should be understood by those skilled in the art that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may also be combined, the steps may be implemented in any order, and there are many other variations of the above aspects of the present invention, which are not provided in detail for the sake of simplicity.

The present invention is intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims (9)

1. An antibacterial PE film blow molding device with high ductility, comprising a base (1), characterized in that it also comprises: a die head (2), a connecting part, a central tube (3), an air supply part, an adjustment part and a plurality of nozzles (4), wherein: The base (1) has a first cavity inside, and the base (1) has an exhaust port (5); The central tube (3) is arranged at the center of the base (1) and passes through the die head (2); The die head (2) is arranged on the top of the base (1), and a second cavity is provided in the die head (2). The die head (2) also has a molding groove (6) arranged in an annular shape from the outside to the inside and a plurality of first vent holes (7) evenly distributed in three layers of annular shapes, wherein the third layer has 16 first vent holes (7), the second layer has 8 first vent holes (7), and the first layer has 4 first vent holes (7); The connecting portion comprises a first annular block (8), a second annular block (9) and a third annular block (10) which are rotatably arranged in the second cavity, the three annular blocks are slidably connected to each other, the third annular block (10) has 16 second vent holes (27) which correspond one-to-one to the 16 first vent holes (7) of the third layer, the second annular block (9) has 8 second vent holes (27) which correspond one-to-one to the 8 first vent holes (7) of the second layer, the first annular block (8) has 4 second vent holes (27) which correspond one-to-one to the 4 first vent holes (7) of the first layer, and the distance ratio between the center of the second vent holes (27) on the third annular block (10), the second annular block (9) and the first annular block (8) and the corresponding center of the three annular blocks is 1.5:1.5:1; A plurality of the nozzles (4) are distributed in an annular manner at the upper end of the central tube (3); the nozzles (4) are hinged to the central tube (3); the adjustment portion is used to adjust the angle of the nozzles (4); and the air supply portion is used to provide compressed air to the nozzles (4); Initially, all of the first vent holes (7) are connected to the corresponding second vent holes (27), and by controlling the three annular blocks to rotate by the same predetermined arc length, the connection state between the second vent holes (27) on the first annular block (8), the second annular block (9) and the third annular block (10) and the corresponding first vent holes (7) is adjusted. 2. The antibacterial PE film blow molding device with high ductility according to claim 1 is characterized in that the control of the three annular blocks to rotate the same arc length to adjust the connection state between the second vent holes (27) on the first annular block (8), the second annular block (9) and the third annular block (10) and the corresponding first vent holes (7) comprises: When the three annular blocks are controlled to rotate with the same arc length L1, the first annular block (8) rotates 90 degrees, the second vent hole (27) on the first annular block (8) is connected to the first vent hole (7) corresponding thereto, and the second vent holes (27) on the second annular block (9) and the third annular block (10) are not connected to the first vent holes (7) corresponding thereto; When the three annular blocks are controlled to rotate with the same arc length L2, the second annular block (9) rotates 45 degrees, the second vent hole (27) on the second annular block (9) is connected to the first vent hole (7) corresponding thereto, and the second vent holes (27) on the first annular block (8) and the third annular block (10) are not connected to the first vent holes (7) corresponding thereto; When the three annular blocks are controlled to rotate with the same arc length L3, the third annular block (10) rotates 22.5 degrees, the second vent hole (27) on the third annular block (10) is connected to the first vent hole (7) corresponding thereto, and the second vent holes (27) on the second annular block (9) and the first annular block (8) are not connected to the first vent holes (7) corresponding thereto; When the three annular blocks are controlled to rotate with the same arc length L4, the first annular block (8) rotates 270 degrees, the second vent holes (27) on the first annular block (8) and the second annular block (9) are connected to the corresponding first vent holes (7), and the second vent holes (27) on the third annular block (10) are not connected to the corresponding first vent holes (7). 3. According to claim 1, an antibacterial PE film blow molding equipment with high ductility is characterized in that the blow molding equipment also includes a driving part and a transmission part, and the driving part is connected to the first annular block (8), the second annular block (9) and the third annular block (10) through the transmission part, and the three annular blocks are driven by the driving part to rotate the same arc length. 4. An antibacterial PE film blow molding equipment with high ductility according to claim 3 is characterized in that the transmission part includes a third connecting rod (13) arranged at the bottom of the third annular block (10), and the bottoms of the two third connecting rods (13) are provided with a third gear ring (16); it also includes a second connecting rod (12) arranged at the bottom of the second annular block (9), and the bottoms of the two second connecting rods (12) are provided with a second gear ring (15); it also includes a first connecting rod (11) arranged at the bottom of the first annular block (8), and the bottoms of the two first connecting rods (11) are provided with a first gear ring (14). 5. According to claim 4, an antibacterial PE film blow molding equipment with high ductility is characterized in that the driving part includes a first electric cylinder, a connecting block (25) is provided on the telescopic rod of the first electric cylinder, and three racks (26) are provided on the connecting block (25), and the three racks (26) are respectively engaged with the first gear ring (14), the second gear ring (15) and the third gear ring (16). 6. According to claim 5, an antibacterial PE film blow molding equipment with high ductility is characterized in that the air supply part includes a first air pipe (17), the first air pipe (17) passes through the base (1) and the center pipe (3) and is connected to a vertically arranged second air pipe (18), and the second air pipe (18) is connected to the multiple nozzles (4) respectively through multiple hoses (19). 7. An antibacterial PE film blow molding equipment with high ductility according to claim 6 is characterized in that the adjustment part includes a second electric cylinder (20) and a spring (21) arranged in the central tube (3), a connecting rod (22) is provided on the telescopic rod of the second electric cylinder (20), and a cross bar (23) is provided on the top of the connecting rod (22), and the cross bar (23) passes through the central tube (3) and is slidably connected to the central tube (3), and a cylinder (24) is surrounded on the cross bar (23), and the top of the cylinder (24) is in contact with the plurality of nozzles (4), one end of the spring (21) is arranged on the nozzle (4), and the other end is arranged on the central tube (3), and the working angle of the nozzle (4) is controlled by the lifting movement of the cylinder (24) in coordination with the spring (21). 8. According to claim 7, an antibacterial PE film blow molding equipment with high ductility is characterized in that the first electric cylinder and the second electric cylinder (20) are electrically connected to a controller, and the controller controls the second electric cylinder (20) to shorten a predetermined length based on the three annular blocks rotating at the same predetermined arc length. 9. A blow molding method of an antibacterial PE film blow molding device with high ductility according to any one of claims 1 to 7, characterized in that it comprises: The raw material is extruded through the forming groove (6) to form a film, and then is pulled by an external pulling device, and compressed air is provided by the air supply part and sprayed from the nozzle (4) into the film, so that the film is blown into a cylindrical structure by the compressed air; When the ductility of the film needs to be adjusted, the angle of the nozzle (4) is adjusted through the adjustment part, thereby controlling the direction in which the compressed air is sprayed; By setting the number of second vent holes (27) on each annular block, the center angle formed between two adjacent second vent holes (27) is a constant value. Then, by designing the distance ratio between the center of the second vent holes (27) on the third annular block (10), the second annular block (9) and the first annular block (8) to the center of the corresponding circle of the three annular blocks to be 1.5:1.5:1, by controlling the three annular blocks to rotate by the same predetermined arc length, the second vent holes (27) on one of the first annular block (8), the second annular block (9) and the third annular block (10) are connected to the first vent hole (7), and the second vent holes (27) on the other annular blocks are not connected to the first vent hole (7). In this way, by adjusting the number of the second vent holes (27) connected to the first vent holes (7), the amount of compressed air discharged is adjusted, and then the amount of compressed air in the film is adjusted to further adjust the ductility of the film.