A layered melt feeding structure for a multi-layer co-extrusion blown film machine

Abstract

This utility model provides a layered melt feeding structure for a multi-layer co-extrusion blown film machine, relating to the technical field of multi-layer co-extrusion blown film machines. Specifically, it includes a barrel, a multi-layer co-extrusion blown film machine body, and a die head. A screw conveyor is installed on one side of the barrel, communicating with the die head. A top plate is installed above the barrel, and a first servo motor is fixedly installed inside the top plate. This application achieves precise docking of the feed pipe with different discharge ports by rotating the fixing ring and the limiting ring, and by operating the fixing bolts. This allows for rapid switching between producing films with different numbers of layers, such as three-layer and five-layer films, reducing equipment adjustment time and improving production efficiency. Furthermore, the rotation of the stirring rod ensures thorough mixing of the material, while the spiral guide plate guides the material in a spiral motion, promoting initial stratification during mixing and effectively improving the quality of the film product, reducing product defects caused by uneven mixing or inaccurate stratification.

Description

Technical Field

[0001] This utility model relates to the field of multi-layer co-extrusion blown film machine technology, specifically a layered melt feeding structure for a multi-layer co-extrusion blown film machine. Background Technology

[0002] In the field of plastic film production, multilayer co-extrusion blown film technology occupies an important position due to its unique advantages. As a common method of plastic film processing, extrusion blown film has many advantages such as low cost, high equipment input-output ratio, mature technology, less waste, and easy product specification change, and is widely used in various industries.

[0003] Chinese Patent Announcement No. CN 218785789 U discloses a multi-layer co-extrusion blown film machine, including a feeding mechanism connected to an exit die head. A three-layer blown film mechanism is arranged outside the exit die head, and the three-layer blown film mechanism is connected to a receiving mechanism. The feeding mechanism includes a mixing tank and a feeding box. A fixing plate is installed on one side of the top of the mixing tank, and a material leveling box is connected to the bottom of the mixing tank. Four sets of material leveling blades are evenly installed on the side wall of the rotating shaft. A negative pressure fan is arranged on one side of the material leveling box, and suction hoses are installed at both the input and output ends of the negative pressure fan. One set of suction hoses is connected to the bottom of the material leveling box. A spiral feeding rod is rotatably connected inside the feeding box, and the spiral feeding rod is driven by a motor located on the outer wall of the feeding box. The discharge end of the feeding box is connected to the inlet of the exit die head. This utility model provides convenient and quick feeding, saves labor, and reduces costs. It can also preheat the film material to improve blown film efficiency.

[0004] In the existing technology, when the production demand changes from three layers to five layers or other layers during the use of a multi-layer co-extrusion blown film machine, it may be necessary to reinstall or replace some core components, which involves a complex mechanical disassembly and debugging process. This not only consumes a lot of manpower and time, but may also cause equipment damage due to improper operation, greatly reducing production efficiency and making it impossible to quickly respond to the diverse film layer demands of the market. Therefore, we have made an improvement and proposed a layered melt feeding structure for a multi-layer co-extrusion blown film machine. Utility Model Content

[0005] The purpose of this invention is to address the problem of poor flexibility in switching the number of film layers in a current multi-layer co-extrusion blown film machine.

[0006] To achieve the above-mentioned objectives, this utility model provides the following technical solution: A layered melt feeding structure for a multi-layer co-extrusion blown film machine achieves precise docking of the feed pipe with different discharge ports by rotating the fixing ring and the limiting ring, as well as operating the fixing bolts, thereby quickly switching to produce films with different numbers of layers such as three-layer and five-layer films, thus improving the above-mentioned problems.

[0007] The application is as follows: A layered melt feeding structure for a multi-layer co-extrusion blown film mill includes a barrel, a multi-layer co-extrusion blown film mill body, and a die head. A screw conveyor is disposed on one side of the barrel and communicates with the die head. A top plate is disposed above the barrel. A first servo motor is fixedly installed inside the top plate. A stirring rod is fixedly installed at the output end of the first servo motor, and the stirring rod passes through the bottom of the top plate and is rotatably connected to it. Two symmetrical spiral guide plates are fixedly installed on the inner wall of the barrel, and both spiral guide plates are slidably connected to the stirring rod. The outer side of the barrel is rotatably connected to... The material cylinder has a fixed ring, and a limiting ring is provided inside the fixed ring and on one side of the fixed ring. The fixed ring and the limiting ring are fixedly connected, and the limiting ring is slidably connected to the material cylinder. Multiple feed pipes are provided on the side of the fixed ring away from the material cylinder. Each of the multiple feed pipes has a fixed pipe fixedly installed at the end near the material cylinder. The multiple feed pipes pass through the fixed ring and are slidably connected to it. The multiple fixed pipes pass through the limiting ring and are slidably connected to it. Multiple discharge ports are opened on the material cylinder, and the fixed pipes communicate with the discharge ports. A fixing structure is provided on the limiting ring and on the outside of the multiple fixed pipes.

[0008] As a preferred technical solution of this application, the fixing structure includes a bidirectional lead screw and a guide rod, which are disposed on corresponding sides of the fixing tube. Two mounting plates are threadedly connected to the outer side of the bidirectional lead screw, and both mounting plates are slidably connected to the limiting ring. Multiple fixing rods are fixedly installed on the side of the two mounting plates that are close to each other, and the multiple fixing rods are inserted into the interior of the fixing tube and slidably connected to it. A drive gear is fixedly installed on the top of the bidirectional lead screw, and the drive gear and the bidirectional lead screw are rotatably connected to the limiting ring. The guide rod passes through the two mounting plates and is slidably connected to them, and the guide rod is fixedly connected to the limiting ring. As a preferred technical solution of this application, a second servo motor is fixedly installed inside the limiting ring, and the output end of the second servo motor is fixedly connected to one of the drive gears. An internal gear ring is slidably connected inside the limiting ring, and the internal gear ring meshes with multiple drive gears. Multiple fixing bolts are provided on the outside of the fixing ring, and the multiple fixing bolts all penetrate the fixing ring and the limiting ring and are threaded to them. The multiple fixing bolts are all inserted into the inside of the material cylinder and are threaded to it. As a preferred technical solution of this application, a discharge pipe is fixedly installed on one side of the material cylinder, the discharge pipe is inserted into the inside of the material cylinder and communicates with it, a connecting pipe is fixedly installed on the top of the screw conveyor and communicates with the screw conveyor, and flanges are fixedly installed on the sides of the discharge pipe and the connecting pipe that are close to each other. The screw conveyor is composed of screw blades and a third servo motor. As a preferred technical solution of this application, a rubber pad is fixedly installed at the bottom of the top plate, and multiple insert plates are provided at the bottom of the top plate. The multiple insert plates pass through the rubber pad and are fixedly connected to it. The multiple insert plates are inserted into the inside of the material cylinder and are slidably connected to it. Pull plates are provided on the outside of the material cylinder and on one side of the multiple insert plates. Two insert rods are fixedly installed on the side of the multiple pull plates near the material cylinder, and the two insert rods pass through the insert plates and are slidably connected to them. The multiple insert rods are inserted into the inside of the material cylinder and are slidably connected to it. As a preferred technical solution of this application, auxiliary rings are fixedly installed on the outer sides of the plurality of insert rods, the plurality of auxiliary rings are slidably connected to the material cylinder, and a return spring is provided on the side of the plurality of auxiliary rings away from the insert plate and on the outer side of the insert rod, and the two ends of the plurality of return springs are respectively fixedly connected to the material cylinder and the auxiliary ring. As a preferred technical solution of this application, a liquid delivery pipe is provided on one side of the material cylinder, the liquid delivery pipe is inserted into the inside of the material cylinder and fixedly connected thereto, and the two ends of the liquid delivery pipe are respectively fixedly connected to an external cooling and heating structure. As a preferred technical solution of this application, a controller is embedded on one side of the material cylinder, the controller is electrically connected to the first servo motor and the second servo motor, and transparent windows are provided on the material cylinder and on the corresponding sides of the infusion tube. Support plates are provided on the outer side of the material cylinder and at the bottom of multiple feed tubes, and multiple support plates are fixedly connected to the material cylinder.

[0009] Compared with the prior art, the beneficial effects of this utility model are as follows: In the scheme of this application: (1) By rotating the fixed ring and the limiting ring, and by operating the fixed bolt, the feed pipe can be accurately connected with different discharge ports, thereby quickly switching to produce films with different numbers of layers such as three-layer and five-layer, reducing equipment adjustment time, improving production efficiency, and the material can be fully stirred by rotating the stirring rod, while the spiral guide plate guides the material to make spiral motion, promoting the initial stratification of the material during the stirring process, effectively improving the quality of film products, and reducing product defects caused by uneven mixing or inaccurate stratification. (2) By setting a fixed structure and driving the second servo motor, the two mounting plates will cause the fixing rod to move away from each other along the guide rod, releasing the clamping of the fixing tube and making the feed tube in a separable state, which greatly improves the disassembly efficiency and significantly reduces the equipment downtime. Attached Figure Description

[0010] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a front sectional view of the present invention. Figure 3This is a partial structural diagram of the present invention; Figure 4 This utility model Figure 3 Enlarged view of point A in the middle; Figure 5 This is a schematic diagram of the fixing structure of this utility model; Figure 6 This is a schematic diagram of the internal structure of the stirring rod of this utility model.

[0011] Explanation of reference numerals in the accompanying drawings: 1. Material cylinder; 2. Screw conveyor; 3. Multi-layer co-extrusion blown film machine body; 4. Die head; 5. Fixing ring; 6. Limiting ring; 7. Feed pipe; 8. Fixing pipe; 9. Discharge port; 10. Top plate; 11. Stirring rod; 12. Spiral guide plate; 13. Drive gear; 14. Second servo motor; 15. Bidirectional lead screw; 16. Mounting plate; 17. Internal gear ring; 18. Infusion pipe; 19. Transparent window; 20. Insert plate; 21. Pull plate; 22. Insert rod; 23. Auxiliary ring; 24. Discharge pipe; 25. Connecting pipe; 26. Controller; 27. Support plate. Detailed Implementation

[0012] The present invention will be further described in detail below with reference to the accompanying drawings.

[0013] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

[0014] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0015] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0016] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0017] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0018] Example 1: Please refer to the appendix of the instruction manual. Figure 1-3 A layered melt feeding structure for a multi-layer co-extrusion blown film machine includes a barrel 1, a multi-layer co-extrusion blown film machine body 3, and a die head 4. A screw conveyor 2 is provided on one side of the barrel 1, and the screw conveyor 2 is connected to the die head 4. A top plate 10 is provided above the barrel 1. A first servo motor is fixedly installed inside the top plate 10. A stirring rod 11 is fixedly installed at the output end of the first servo motor, and the stirring rod 11 passes through the bottom of the top plate 10 and is rotatably connected to it. Two symmetrical spiral guide plates 12 are fixedly installed on the inner wall of the barrel 1, and both spiral guide plates 12 are slidably connected to the stirring rod 11. A fixing ring is rotatably connected to the outer side of the barrel 1. 5. A limiting ring 6 is provided inside the material cylinder 1 and on one side of the fixed ring 5. The fixed ring 5 and the limiting ring 6 are fixedly connected, and the limiting ring 6 is slidably connected to the material cylinder 1. Multiple feed pipes 7 are provided on the side of the fixed ring 5 away from the material cylinder 1. A fixing pipe 8 is fixedly installed at the end of each feed pipe 7 near the material cylinder 1. The multiple feed pipes 7 pass through the fixed ring 5 and are slidably connected to it. The multiple fixing pipes 8 pass through the limiting ring 6 and are slidably connected to it. Multiple discharge ports 9 are opened on the material cylinder 1, and the fixing pipes 8 are connected to the discharge ports 9. The multiple discharge ports 9 are inclined inward. A fixing structure is provided on the limiting ring 6 and on the outside of the multiple fixing pipes 8.

[0019] In this embodiment of the invention, the material enters through the feed pipe 7 and connects to the inwardly inclined discharge port 9 on the material cylinder 1 via the fixed pipe 8, smoothly falling into the interior of the material cylinder 1. At this time, the first servo motor inside the top plate 10 starts, driving the stirring rod 11 to rotate. During the rotation, the stirring rod 11 cooperates with the spiral guide plates 12 symmetrically arranged on the inner wall of the material cylinder 1, not only stirring and mixing the material, but also, under the guidance of the spiral guide plates 12, causing the material to move in a spiral motion along the inner wall of the material cylinder 1, thereby achieving thorough stirring and initial stratification of the material. When it is necessary to switch the number of film layers produced, since the fixed ring 5 is rotatably connected to the material cylinder 1, and the limiting ring 6 is fixedly connected to the fixed ring 5 and slidably connected to the material cylinder 1, by releasing the fixing bolt and driving the fixed ring 5 to rotate by external force, the limiting ring 6 will rotate synchronously. As the limiting ring 6 rotates, the fixed tube 8 fixed on it also rotates, so that the feed pipe 7 and the fixed tube 8 can connect to other discharge ports 9.

[0020] In this embodiment of the invention, different types of melts enter the barrel 1 through the feed pipe 7 and the fixed pipe 8, respectively, via the inwardly inclined discharge port 9, achieving initial stratification. The first servo motor is started, driving the stirring rod 11 to rotate. Under the constraint of the spiral guide plate 12, the stirring rod 11 moves in a spiral motion along the inner wall of the barrel 1, performing all-round stirring and mixing of the melt.

[0021] When switching from producing three-layer film to five-layer film, the operator loosens the fixing bolts on the outside of the fixing ring 5, rotates the fixing ring 5, and drives the limiting ring 6 and the fixing tube 8 to rotate, precisely aligning the previously unused discharge port 9 corresponding to the five-layer film production specification with the fixing tube 8. The fixing bolts are then tightened to complete the switch. After alignment, different types of materials enter the material cylinder 1 from the corresponding feed pipe 7, fixing tube 8, and discharge port 9, respectively. Under the action of the stirring rod 11 and the spiral guide plate 12, they are further mixed and layered, and finally conveyed to the machine head 4 via the screw conveyor 2 to complete the production of films with different layers.

[0022] Example 2: Please refer to the appendix of the instruction manual. Figure 1-5 In a preferred embodiment of this utility model, the fixing structure includes a bidirectional lead screw 15 and a guide rod. The bidirectional lead screw 15 and the guide rod are arranged on corresponding sides of the fixing tube 8. Two mounting plates 16 are threadedly connected to the outer side of the bidirectional lead screw 15. Both mounting plates 16 are slidably connected to the limiting ring 6. Multiple fixing rods are fixedly installed on the side of the two mounting plates 16 that are close to each other. The multiple fixing rods are inserted into the interior of the fixing tube 8 and slidably connected to it. A drive gear 13 is fixedly installed on the top of the bidirectional lead screw 15. The drive gear 13 and the bidirectional lead screw 15 are rotatably connected to the limiting ring 6. The guide rod passes through the two mounting plates 16 and is slidably connected to them. The guide rod is fixedly connected to the limiting ring 6.

[0023] A second servo motor 14 is fixedly installed inside the limiting ring 6. The output end of the second servo motor 14 is fixedly connected to one of the drive gears 13. An internal gear ring 17 is slidably connected inside the limiting ring 6. The internal gear ring 17 meshes with multiple drive gears 13. Multiple fixing bolts are provided on the outside of the fixing ring 5. All fixing bolts pass through the fixing ring 5 and the limiting ring 6 and are threaded to them. All fixing bolts are inserted into the inside of the material cylinder 1 and are threaded to it. Sealing rings are provided at the junctions of the limiting ring 6, the material cylinder 1, the fixing tube 8, and the discharge port 9.

[0024] A discharge pipe 24 is fixedly installed on one side of the material cylinder 1. The discharge pipe 24 is inserted into the inside of the material cylinder 1 and communicates with it. A connecting pipe 25 is fixedly installed on the top of the screw conveyor 2 and communicates with the screw conveyor 2. Flanges are fixedly installed on the sides of the discharge pipe 24 and the connecting pipe 25 that are close to each other. Filter screens are installed inside the discharge pipe 24 and the connecting pipe 25. The aperture of the two filter screens decreases from left to right. The screw conveyor 2 is composed of screw blades and a third servo motor.

[0025] A rubber pad is fixedly installed at the bottom of the top plate 10. Multiple insert plates 20 are provided at the bottom of the top plate 10. The multiple insert plates 20 pass through the rubber pad and are fixedly connected to it. The multiple insert plates 20 are inserted into the inside of the material cylinder 1 and are slidably connected to it. Pull plates 21 are provided on the outside of the material cylinder 1 and on one side of the multiple insert plates 20. Two insert rods 22 are fixedly installed on the side of the multiple pull plates 21 near the material cylinder 1. The two insert rods 22 pass through the insert plates 20 and are slidably connected to them. The multiple insert rods 22 are inserted into the inside of the material cylinder 1 and are slidably connected to it.

[0026] Auxiliary rings 23 are fixedly installed on the outer side of multiple insertion rods 22. Multiple auxiliary rings 23 are slidably connected to the material cylinder 1. Each of the multiple auxiliary rings 23 is provided with a return spring on the side away from the insertion plate 20 and on the outer side of the insertion rod 22. Both ends of the multiple return springs are fixedly connected to the material cylinder 1 and the auxiliary rings 23 respectively.

[0027] A liquid delivery pipe 18 is provided on one side of the material cylinder 1. The liquid delivery pipe 18 is inserted into the inside of the material cylinder 1 and fixedly connected thereto. The two ends of the liquid delivery pipe 18 are respectively fixedly connected to an external cooling and heating structure.

[0028] A controller 26 is embedded on one side of the feed cylinder 1. The controller 26 is electrically connected to the first servo motor and the second servo motor 14. Transparent windows 19 are provided on the feed cylinder 1 on both sides corresponding to the infusion tube 18. Support plates 27 are provided on the outside of the feed cylinder 1 at the bottom of the multiple feed tubes 7. The multiple support plates 27 are fixedly connected to the feed cylinder 1.

[0029] In this embodiment of the invention, after the fixed tube 8 is inserted into the feed port 9, the second servo motor 14 inside the limiting ring 6 is started, which drives the connected drive gear 13 to rotate. Through the internal gear ring 17, other drive gears 13 rotate synchronously, thereby driving the bidirectional lead screw 15 to rotate. The rotation of the bidirectional lead screw 15 causes the two mounting plates 16 to move towards the middle along the guide rod. The fixing rod on the mounting plate 16 is inserted into the fixed tube 8, firmly fixing the fixed tube 8 to the limiting ring 6 and the material cylinder 1, further facilitating the disassembly and replacement of the feed tube 7. The sealing ring ensures the sealing of the connection and prevents melt leakage.

[0030] The uniformly mixed melt flows out of the feed cylinder 1 through the discharge pipe 24. The filter screen inside the discharge pipe 24 and the connecting pipe 25 filters the melt, and the mesh size of the filter screen decreases from left to right, gradually filtering out impurities in the melt. The third servo motor of the screw conveyor 2 drives the screw blades to rotate, conveying the filtered melt to the die head 4, providing pure and uniform melt raw material for the multi-layer co-extrusion blown film machine body 3. When installing the top plate 10, insert the insert plate 20 into the slot of the material cylinder 1. Insert the insert rod 22 on the pull plate 21 through the insert plate 20 into the material cylinder 1. Under the action of the return spring, the auxiliary ring 23 ensures that the insert rod 22 is stably inserted, so that the top plate 10 is tightly connected to the material cylinder 1. When disassembling, pull the pull plate 21 to move the insert rod 22 out of the insert plate 20, and the top plate 10 can be easily removed, which facilitates cleaning and maintenance of the inside of the material cylinder 1. The infusion pipe 18 is connected to an external cooling and heating structure, which is an existing structure. It regulates the temperature of the melt in the barrel 1 by circulating coolant or heating liquid. The operator can observe the state of the melt in the barrel 1 through the transparent window 19. As needed, the temperature of the infusion pipe 18 is controlled by the controller 26 to ensure that the melt is mixed and transported at a suitable temperature, thus ensuring the quality of film production.

[0031] Example 3: Please refer to the appendix of the instruction manual. Figure 6 In a preferred embodiment of this utility model, two stirring blades are rotatably connected to the stirring rod 11 via a rotating shaft. Both stirring blades are rotatably connected to the stirring rod 11 via a rotating shaft. Insert rings are fixedly installed on corresponding sides of the two stirring blades, and multiple insert rings are inserted into the interior of the stirring rod 11 and slidably connected thereto. Two adjusting gears are rotatably connected inside the stirring rod 11, and the two adjusting gears mesh. The two adjusting gears are fixedly connected to the rotating shaft on one side of each of the two stirring blades. An electric telescopic rod is fixedly installed inside the stirring rod 11. A rack is fixedly installed at the output end of the electric telescopic rod, and the rack is slidably connected to the stirring rod 11. An auxiliary gear meshes with the outer side of the rack, and the auxiliary gear is fixedly connected to the rotating shaft on one side of one of the stirring blades. The auxiliary gear and the two adjusting gears are slidably connected to the stirring rod 11. The controller 26 is electrically connected to the electric telescopic rod.

[0032] In this embodiment of the invention, the controller 26 controls the extension or retraction of the electric telescopic rod, driving the rack to move, and then changing the angle of the stirring blades through the transmission of auxiliary gears and adjusting gears. When it is necessary to increase the stirring force, the stirring blades can be adjusted to a larger opening angle to increase the stirring range and force of the melt, ensuring that melts with high viscosity or high mixing difficulty can be fully mixed; conversely, for melts with good fluidity, the stirring blade angle can be reduced to reduce energy consumption and improve mixing efficiency while ensuring the mixing effect.

[0033] In this embodiment of the invention, the adjustable angle of the stirring blades allows the stirring rod 11 to stir the melt in a more efficient manner during rotation. Compared to stirring blades with a fixed angle, adjustable blades can cover a wider stirring area, reduce dead zones in melt mixing, and avoid incomplete mixing in certain areas, thereby significantly improving the uniformity of melt mixing and laying the foundation for producing multilayer co-extruded films with uniform performance and superior quality.

[0034] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall fall within the scope of the technical solution of the present utility model.

Claims

1. A layered melt feed structure for a multi-layer co-extrusion blown film machine comprising a barrel (1), a multi-layer co-extrusion blown film machine body (3) and a die head (4), characterized in that, A screw conveyor (2) is provided on one side of the material cylinder (1), and the screw conveyor (2) is connected to the machine head (4). A top plate (10) is provided above the material cylinder (1). A first servo motor is fixedly installed inside the top plate (10). A stirring rod (11) is fixedly installed at the output end of the first servo motor, and the stirring rod (11) passes through the bottom of the top plate (10) and is rotatably connected to it. Two symmetrical spiral guide plates (12) are fixedly installed on the inner wall of the material cylinder (1), and both spiral guide plates (12) are slidably connected to the stirring rod (11). A fixing ring (5) is rotatably connected to the outer side of the material cylinder (1). The inside of the material cylinder (1) and located in the fixing ring (5) A limiting ring (6) is provided on one side, and the fixed ring (5) is fixedly connected to the limiting ring (6). The limiting ring (6) is slidably connected to the material cylinder (1). Multiple feed pipes (7) are provided on the side of the fixed ring (5) away from the material cylinder (1). A fixed pipe (8) is fixedly installed at the end of the multiple feed pipes (7) near the material cylinder (1). The multiple feed pipes (7) pass through the fixed ring (5) and are slidably connected to it. The multiple fixed pipes (8) pass through the limiting ring (6) and are slidably connected to it. Multiple discharge ports (9) are opened on the material cylinder (1), and the fixed pipes (8) are connected to the discharge ports (9). A fixing structure is provided on the limiting ring (6) and outside the multiple fixed pipes (8).

2. A layered melt feed structure for a multi-layer co-extrusion film blowing machine as claimed in claim 1, wherein, The fixing structure includes a bidirectional lead screw (15) and a guide rod. The bidirectional lead screw (15) and the guide rod are arranged on opposite sides of the fixing tube (8). The outer side of the bidirectional lead screw (15) is threaded with two mounting plates (16). Both mounting plates (16) are slidably connected to the limiting ring (6). Multiple fixing rods are fixedly installed on the side of the two mounting plates (16) that are close to each other. The multiple fixing rods are inserted into the interior of the fixing tube (8) and slidably connected to it. A drive gear (13) is fixedly installed on the top of the bidirectional lead screw (15). The drive gear (13) and the bidirectional lead screw (15) are rotatably connected to the limiting ring (6). The guide rod passes through the two mounting plates (16) and is slidably connected to them. The guide rod is fixedly connected to the limiting ring (6).

3. A layered melt feed structure for a multi-layer co-extrusion film blowing machine as claimed in claim 2, wherein, The limiting ring (6) is fixedly installed with a second servo motor (14). The output end of the second servo motor (14) is fixedly connected to one of the drive gears (13). The limiting ring (6) is slidably connected with an internal gear ring (17). The internal gear ring (17) meshes with multiple drive gears (13). Multiple fixing bolts are provided on the outside of the fixing ring (5). The multiple fixing bolts pass through the fixing ring (5) and the limiting ring (6) and are threaded to them. The multiple fixing bolts are inserted into the inside of the material cylinder (1) and are threaded to it.

4. A layered melt feed structure for a multi-layer co-extrusion film blowing machine as claimed in claim 1, wherein, A discharge pipe (24) is fixedly installed on one side of the material cylinder (1). The discharge pipe (24) is inserted into the inside of the material cylinder (1) and communicates with it. A connecting pipe (25) is fixedly installed on the top of the screw conveyor (2) and communicates with the screw conveyor (2). Flanges are fixedly installed on the sides of the discharge pipe (24) and the connecting pipe (25) that are close to each other. The screw conveyor (2) is composed of a screw blade and a third servo motor.

5. A layered melt feed structure for a multi-layer co-extrusion film blowing machine as claimed in claim 1, wherein, A rubber pad is fixedly installed at the bottom of the top plate (10). Multiple insert plates (20) are provided at the bottom of the top plate (10). The multiple insert plates (20) pass through the rubber pad and are fixedly connected to it. The multiple insert plates (20) are inserted into the inside of the material cylinder (1) and are slidably connected to it. Pull plates (21) are provided on the outside of the material cylinder (1) and on one side of the multiple insert plates (20). Two insert rods (22) are fixedly installed on the side of the multiple pull plates (21) near the material cylinder (1). The two insert rods (22) pass through the insert plates (20) and are slidably connected to them. The multiple insert rods (22) are inserted into the inside of the material cylinder (1) and are slidably connected to it.

6. A layered melt feed structure for a multi-layer co-extrusion film blowing machine as claimed in claim 5, wherein, Auxiliary rings (23) are fixedly installed on the outer side of each of the multiple insertion rods (22). Each of the multiple auxiliary rings (23) is slidably connected to the material cylinder (1). Each of the multiple auxiliary rings (23) is provided with a return spring on the side away from the insertion plate (20) and on the outer side of the insertion rod (22). Both ends of the multiple return springs are fixedly connected to the material cylinder (1) and the auxiliary rings (23) respectively.

7. A layered melt feed structure for a multi-layer co-extrusion film blowing machine as claimed in claim 1, wherein, A liquid delivery pipe (18) is provided on one side of the material cylinder (1). The liquid delivery pipe (18) is inserted into the inside of the material cylinder (1) and fixedly connected thereto. The two ends of the liquid delivery pipe (18) are respectively fixedly connected to an external cooling and heating structure.

8. A layered melt feed structure for a multi-layer co-extrusion film blowing machine as claimed in claim 1, wherein, A controller (26) is embedded on one side of the feed cylinder (1). The controller (26) is electrically connected to the first servo motor and the second servo motor (14). A transparent window (19) is provided on the feed cylinder (1) on both sides corresponding to the infusion tube (18). A support plate (27) is provided on the outside of the feed cylinder (1) and at the bottom of the multiple feed tubes (7). The multiple support plates (27) are fixedly connected to the feed cylinder (1).

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