An EVA plastic film extruder

Abstract

The present invention relates to the technical field of film extruders, specifically to an EVA plastic film extruder, comprising a chassis, a control panel and a processing pipeline are installed on the chassis, a feed funnel is installed on the top wall of the processing pipeline, a worm is installed in the processing pipeline for horizontal rotation, a pressurizing box is installed at one end of the processing pipeline, a plurality of heat dissipation ports are provided on the top and bottom walls of the pressurizing box, a mounting block is installed on the side wall of the pressurizing box, a shaping mold extending into the pressurizing box is horizontally inserted on the side wall of the mounting block, two cavities are provided on the mounting block, and a first baffle extending into the cavity is vertically and movably inserted on the top and bottom walls of the shaping mold. The present invention can prevent fluffy materials in the shaping mold from flowing directly out of the shaping mold by blocking the shaping mold with the first baffle, resulting in uneven edges of the film just produced, so that it needs to be cut off and processed again.

Description

Technical Field

[0001] The invention relates to the technical field of film extruders, in particular to an EVA plastic film extruder. Background Art

[0002] In plastic extrusion equipment, plastic extruders are usually called main machines, while the subsequent equipment plastic extrusion molding machines are called auxiliary machines. After more than 100 years of development, plastic extruders have evolved from the original single screw to twin screws, multiple screws, and even screwless machines. Plastic extruders (main machines) can be matched with various plastic molding auxiliary machines such as pipes, films, holding materials, monofilaments, flat wires, strapping tapes, extruded nets, plates (sheets), profiles, granulation, cable coating, etc. to form various plastic extrusion molding production lines and produce various plastic products. Therefore, plastic extrusion molding machinery is one of the widely used machines in the plastic processing industry, whether now or in the future.

[0003] However, when the film extruders on the market are first started up, there will usually be a section of waste material at the beginning of the discharge due to the uneven distribution of the molten material extruded into the molding die. At the same time, there is air in the mold, and the molten material tends to wrap the air when flowing, which will cause bubbles in the products produced at the beginning, resulting in unqualified products.

[0004] For this reason, a kind of EVA plastic film extruder is proposed. Summary of the invention

[0005] The object of the present invention is to provide an EVA plastic film extruder to solve the problem that the product edges of the product produced by the film extruder are irregular or the product contains bubbles, resulting in unqualified products when the film extruder starts to operate.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] An EVA plastic film extruder comprises a chassis, a control panel and a processing pipeline are installed on the chassis, a feeding funnel is installed on the top wall of the processing pipeline, a worm is installed in the processing pipeline for horizontal rotation, a pressurizing box is installed at one end of the processing pipeline, a plurality of heat dissipation ports are provided on the top wall and the bottom wall of the pressurizing box, a mounting block is installed on the side wall of the pressurizing box, a shaping mold extending into the pressurizing box is horizontally inserted on the side wall of the mounting block, two cavities are provided on the mounting block, a first baffle extending into the cavity is vertically and movably inserted on the top wall and the bottom wall of the shaping mold, a first plug rod is vertically installed on one end of each of the first baffles located in the cavity, and a rod extending to the side wall of each of the cavities is provided. The circular holes in the pressurized box, each of which is horizontally and movably equipped with a pressure plate, each of which is horizontally and fixedly installed with a card plate extending into the cavity, each of which is provided with a socket adapted to the first plug rod, each of which is horizontally installed with a mounting plate, each of which is installed with a memory alloy extending to the inner wall of the shaping mold, the inner top wall and the inner bottom wall of the pressurized box are hinged with telescopic plates, the top wall and the bottom wall of the pressurized box are vertically installed with cylinders for driving the telescopic plates to rotate, two air cabins connected to the air inlets of the cylinders are vertically installed in the pressurized box, the outer wall of the air cabin is wrapped with a heating wire, the outer jacket of the heating wire is provided with a protective sleeve, and the protective sleeve is provided with a trigger mechanism for triggering the temperature rise of the air cabin;

[0008] The trigger mechanism includes a second baffle installed on the inner wall of the protective sleeve, a heat-conducting plate is movably provided in the protective sleeve, a first push rod extending to the top wall of the second baffle is vertically installed on the top wall of the heat-conducting plate, a heat insulation plate is installed on the top end of the first push rod, and the diameter of the heat insulation plate is larger than the inner diameter of the second baffle and smaller than the outer diameter of the second baffle.

[0009] During the working process, the molten material is first squeezed into the pressurized box by the worm. When the pressurized box is full of materials, the pressure in the pressurized box increases because the worm is still transporting materials into the pressurized box. At this time, the heat conducting plate is squeezed by the material and slides upward along the inner wall of the protective sleeve. During the upward sliding of the heat conducting plate, the first push rod vertically installed on the top wall drives the heat insulating plate to break contact with the second baffle with a heat insulating effect, so that the temperature in the pressurized box can be transferred to the protective sleeve, and the temperature in the air cabin is increased by heat conduction. At the same time, under the action of the heating wire, the temperature in the air cabin can be rapidly increased, thereby driving the cylinder to drive the telescopic plate to rotate. During the rotation of the telescopic plate, the material in the pressurized box can be squeezed, so that the contact between the materials is closer. At the same time, during the rotation of the telescopic plate, the material in the pressurized box can be squeezed. During the process, the material is squeezed, so that the gas mixed between the materials can pass through the upper plate of the nano material and flow out through the pores on the pressurizing box, thereby preventing the gas mixed between the materials from causing the quality of the film to deteriorate. When the pressure in the pressurizing box is large enough, the pressing plate will be squeezed and slide along the circular hole. During the sliding process of the pressing plate, the card plate is driven to move in the first cavity. At the same time, the memory alloy has a tendency to stretch when heated. Therefore, during the movement of the card plate, if the socket on the card plate is just above the first plug rod, the memory alloy will push the mounting plate to drive the first plug rod to be inserted into the socket. When the first plug rod is pushed, the first baffle is driven to retract into the first cavity. Therefore, when the pressure is large enough, the first baffle can be automatically opened, which prevents the occurrence of waste materials at the beginning of production due to gaps in the molding mold.

[0010] Preferably, partitions are vertically installed in both cylinders, and the partitions divide the cylinders into a third cavity and a fourth cavity. The third cavity and the fourth cavity are respectively movably provided with a first piston plate and a second piston plate. A second spring is provided between the first piston plate and the inner wall of the cylinder, and a second push rod is vertically installed on the second piston plate and extends to the surface of the upper plate.

[0011] When the pressure in the air cabin increases, the first piston plate will be pushed upward, move up along the third cavity, and squeeze the second spring. In the process of the first piston plate moving up, the second piston plate will drive the second push rod to move down along the fourth cavity. In the process of the second push rod moving down, it will push the telescopic plate to rotate, thereby driving the telescopic plate to pressurize the material again.

[0012] Preferably, the telescopic plate includes an upper plate made of magnetic material, a groove is formed on the upper plate, a connecting rod is movably provided in the groove, a lower plate made of nano material which is in contact with the bottom wall of the upper plate is fixedly mounted on one end of the connecting rod, and a first spring connected to the groove is mounted on one end of the connecting rod.

[0013] In the initial state, the side walls of the upper plate and the lower plate are in contact with the inner wall of the pressurized box, and because the first spring pushes the lower plate, during the rotation of the telescopic plate, the lower plate can always be in contact with the inner wall of the pressurized box, thereby preventing the material from overflowing into the cavity formed between the telescopic plate and the pressurized box, and ensuring that the telescopic plate can squeeze the material and make the material in close contact during the rotation. When use is over, no more material continues to enter the pressurized box. Therefore, the temperature in the pressurized box gradually decreases, and the temperature in the air cabin decreases, so the pressure decreases. Under the combined action of pressure and the second spring, the first piston plate moves downward along the third cavity, resulting in a negative pressure state in the third cavity. Therefore, the second piston plate drives the second push rod to move upward to balance the pressure. At this time, the second push rod no longer applies pressure to the upper plate, and because the upper plate is made of magnet material, after the two upper plates are not subject to external pressure, under the action of magnetic force, the two upper plates will repel each other and return to the initial state.

[0014] Preferably, a piezoelectric ceramic connected in series with the heating wire is fixedly mounted on the inner wall of the processing pipe, and an impact rod having the same length as the inner diameter of the processing pipe is vertically mounted at one end of the worm.

[0015] During the rotation of the worm, the impact rod installed at one end and perpendicular to it rotates accordingly. The impact force when the impact rod contacts the piezoelectric ceramic is used to trigger the piezoelectric ceramic to generate electricity, thereby supplying power to the heating wire and generating heat.

[0016] Preferably, two second insertion rods connected to the heat insulation board are vertically and movably inserted on the bottom wall of the air cabin, and a push plate movably arranged in the air cabin is commonly installed on the top ends of the two second insertion rods.

[0017] When the heat conducting plate is squeezed upward by the material, the second plunger will be driven upward, and the push plate will be pushed upward by the second plunger, thereby increasing the pressure in the air chamber, assisting the first piston plate to move upward, and increasing the thrust of the second push rod.

[0018] Preferably, an air bag is installed on the push plate, and the air bag is filled with ammonia.

[0019] Since ammonia has a large expansion coefficient, when the temperature in the air cabin rises, the volume of ammonia expands is larger than when the air cabin is filled with air. Therefore, the pressure in the air cabin can be increased more effectively. At the same time, placing ammonia in the air bag ensures that ammonia will not leak into the air and pollute the air.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. When the device just starts working, the first baffle is used to block the shaping mold to prevent the fluffy material in the shaping mold from flowing out directly from the shaping mold, resulting in uneven edges of the film just produced, so that it needs to be cut off and processed again.

[0022] 2. When the pressurized box is filled with materials, the processing pipeline continues to transport materials into the pressurized box, so the heat conduction plate is pushed upward by the materials, so that the heat insulation plate is out of contact with the second baffle, so that the temperature in the pressurized box can be transferred to the air cabin by heat radiation, so that the gas in the air cabin expands due to the heat, and the pressure in the cylinder connected to the air cabin can be increased, so that the second push rod is used to push the telescopic plate, and the telescopic plate is used to squeeze the material to make the material tighter. At the same time, when the material is squeezed, the gas in it can be discharged into the air through the upper plate of the nano material and the air holes on the pressurized box.

[0023] 3. Since the first spring pushes the upper plate, the upper plate is always in contact with the inner wall of the pressurizing box during the rotation of the telescopic plate, thereby preventing the material from overflowing into the cavity formed between the telescopic plate and the pressurizing box, thereby ensuring that the telescopic plate can squeeze the material and make the material in close contact during the rotation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 It is a combined diagram of the middle box and the processing pipeline of the present invention;

[0026] Figure 3 is a cross-sectional view of the present invention;

[0027] Figure 4 It is an enlarged view of A of the present invention;

[0028] Figure 5 It is an enlarged view of B of the present invention;

[0029] Figure 6 It is a combined diagram of the lower plate and the upper plate of the present invention;

[0030] Figure 7 It is a cross-sectional view of the upper plate of the present invention.

[0031] In the figure: 1. chassis; 2. control panel; 3. processing pipeline; 4. feeding funnel; 5. worm; 6. pressurizing box; 7. mounting block; 8. shaping mold; 9. first baffle; 10. first plug rod; 11. pressure plate; 12. clamping plate; 13. mounting plate; 14. memory alloy; 15. telescopic plate; 1501. upper plate; 1502. first spring; 1503. lower plate; 1504. connecting rod; 16. cylinder; 17. air chamber; 18. heating wire; 19. protective sleeve; 20. second baffle; 21. heat conducting plate; 22. first push rod; 23. heat insulating plate; 24. second plug rod; 25. push plate; 26. air bag; 27. partition; 28. first piston plate; 29. ​​second piston plate; 30. second spring; 31. second push rod; 32. piezoelectric ceramic; 33. impact rod. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0034] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] See also Figures 1 to 7 The present invention provides an EVA plastic film extruder, and the technical solution is as follows:

[0036] An EVA plastic film extruder comprises a chassis 1, a control panel 2 and a processing pipeline 3 are installed on the chassis 1, a feeding funnel 4 is installed on the top wall of the processing pipeline 3, a worm 5 is installed horizontally and rotatably in the processing pipeline 3, a pressurizing box 6 is installed at one end of the processing pipeline 3, a plurality of heat dissipation ports are provided on the top and bottom walls of the pressurizing box 6, a mounting block 7 is installed on the side wall of the pressurizing box 6, a shaping mold 8 extending into the pressurizing box 6 is horizontally inserted on the side wall of the mounting block 7, two cavities are provided on the mounting block 7, a first baffle 9 extending into the cavity is vertically and movably inserted on the top and bottom walls of the shaping mold 8, a first insertion rod 10 is vertically installed on one end of each first baffle 9 located in the cavity, a circular hole extending into the pressurizing box 6 is provided on the side wall of each cavity, and each circular hole is provided on the side wall of each cavity. A pressure plate 11 is horizontally movable in each hole, a card plate 12 extending into the cavity is horizontally fixedly installed on each pressure plate 11, a plug hole adapted to the first plug rod 10 is opened on each card plate 12, a mounting plate 13 is horizontally installed on each first plug rod 10, a memory alloy 14 extending to the inner wall of the shaping mold 8 is installed on each mounting plate 13, a telescopic plate 15 is hinged on the inner top wall and the inner bottom wall of the pressurizing box 6, a cylinder 16 for driving the telescopic plate 15 to rotate is vertically installed on the top wall and the bottom wall of the pressurizing box 6, two air chambers 17 connected to the air inlet of the cylinder 16 are vertically installed in the pressurizing box 6, an electric heating wire 18 is wound on the outer wall of the air chamber 17, a protective sleeve 19 is provided on the outer jacket of the electric heating wire 18, and a trigger mechanism for triggering the temperature rise of the air chamber 17 is provided on the protective sleeve 19;

[0037] The trigger mechanism includes a second baffle 20 installed on the inner wall of the protective sleeve 19, a heat conducting plate 21 is movably provided in the protective sleeve 19, a first push rod 22 extending to the top wall of the second baffle 20 is vertically installed on the top wall of the heat conducting plate 21, and a heat insulating plate 23 is installed on the top end of the first push rod 22, and the diameter of the heat insulating plate 23 is larger than the inner diameter of the second baffle 20 and smaller than the outer diameter of the second baffle 20.

[0038] During the working process, the device is first debugged through the control panel 2, and then raw materials are poured into the feed funnel 4, so that the raw materials enter the processing pipeline 3 through the feed funnel 4 for processing. The molten material in the processing pipeline 3 is first squeezed by the worm 5 into the pressurizing box 6. When the pressurizing box 6 is full of materials, the worm 5 is still conveying materials into the pressurizing box 6, so the pressure in the pressurizing box 6 increases. At this time, the heat conducting plate 21 is squeezed by the materials and slides upward along the inner wall of the protective sleeve 19. When the heat conducting plate 21 slides upward, During the movement, the first push rod 22 vertically installed on the top wall drives the heat insulation plate 23 to break away from the contact with the second baffle plate 20 with heat insulation effect, so that the temperature in the pressurized box 6 can be transferred to the protective sleeve 19, and the temperature in the air cabin 17 is increased by heat conduction. At the same time, under the action of the electric heating wire 18, the temperature in the air cabin 17 can be quickly increased, thereby driving the cylinder 16, so that the cylinder 16 drives the telescopic plate 15 to rotate, and during the rotation of the telescopic plate 15, the pressurized box can be squeezed. 6, so that the contact between the materials is closer. At the same time, during the rotation of the telescopic plate 15, the materials are squeezed, so that the gas mixed between the materials can pass through the upper plate 1501 of the nano material and flow out through the pores on the pressurizing box 6, thereby preventing the gas mixed between the materials from causing the quality of the film to deteriorate. When the pressure in the pressurizing box 6 is large enough, the pressing plate 11 will be squeezed and slide along the circular hole. During the sliding of the pressing plate 11, the card plate 12 is driven to move in the first cavity. At the same time, the memory alloy 14 has a tendency to stretch when heated. Therefore, during the movement of the card plate 12, if the socket on the card plate 12 is just above the first plug rod 10, the memory alloy 14 will push the mounting plate 13 to drive the first plug rod 10 to be inserted into the socket. When the first plug rod 10 is pushed, the first baffle 9 is driven to retract into the first cavity. Therefore, when the pressure is large enough, the first baffle 9 can be automatically opened, which prevents the occurrence of waste materials at the beginning of production due to the gap in the molding mold 8.

[0039] As an embodiment of the present invention, refer to Figure 3 A partition 27 is vertically installed in each of the two cylinders 16, and the partition 27 divides the cylinder 16 into a third cavity and a fourth cavity. A first piston plate 28 and a second piston plate 29 are movably provided in the third cavity and the fourth cavity respectively. A second spring 30 is provided between the first piston plate 28 and the inner wall of the cylinder 16, and a second push rod 31 extending to the surface of the upper plate 1501 is vertically installed on the second piston plate 29.

[0040] When the pressure in the air chamber 17 increases, the first piston plate 28 will be pushed upward, move up along the third cavity, and squeeze the second spring 30. During the upward movement of the first piston plate 28, the second piston plate 29 will drive the second push rod 31 to move downward along the fourth cavity. During the downward movement of the second push rod 31, the telescopic plate 15 will be pushed to rotate, thereby driving the telescopic plate 15 to pressurize the material again.

[0041] As an embodiment of the present invention, refer to Figure 7 The telescopic plate 15 includes an upper plate 1501 made of magnetic material, a groove is formed on the upper plate 1501, a connecting rod 1504 is movably arranged in the groove, one end of the connecting rod 1504 is fixedly mounted with a lower plate 1503 made of nano material that is in contact with the bottom wall of the upper plate 1501, and one end of the connecting rod 1504 is mounted with a first spring 1502 connected to the groove.

[0042] In the initial state, the side walls of the upper plate 1501 and the lower plate 1503 are in contact with the inner wall of the pressurized box 6, and because the first spring 1502 pushes the lower plate 1503, during the rotation of the telescopic plate 15, the lower plate 1503 can always be in contact with the inner wall of the pressurized box 6, thereby preventing the material from overflowing into the cavity formed between the telescopic plate 15 and the pressurized box 6, and ensuring that the telescopic plate 15 can squeeze the material and make the material in close contact during the rotation. When the use is over, no more material continues to enter the pressurized box 6, so the pressurized box 6 The temperature gradually decreases, and the temperature in the air chamber 17 decreases, so the pressure decreases. Under the combined action of the pressure and the second spring 30, the first piston plate 28 moves downward along the third cavity, causing the third cavity to be in a negative pressure state. Therefore, the second piston plate 29 drives the second push rod 31 to move upward to balance the pressure. At this time, the second push rod 31 no longer applies pressure to the upper plate 1501, and because the upper plate 1501 is made of magnet material, after the two upper plates 1501 are not subjected to external pressure, under the action of magnetic force, the two upper plates 1501 will repel each other and return to the initial state.

[0043] As an embodiment of the present invention, refer to Figure 3 A piezoelectric ceramic 32 connected in series with the heating wire 18 is fixedly mounted on the inner wall of the processing pipe 3 , and a striking rod 33 having the same length as the inner diameter of the processing pipe 3 is vertically mounted at one end of the worm 5 .

[0044] During the rotation of the worm 5, the impact rod 33 installed at one end thereof and perpendicular thereto rotates accordingly, and the impact force when the impact rod 33 contacts the piezoelectric ceramic 32 is used to trigger the piezoelectric ceramic 32 to generate electricity, thereby providing power and heat to the heating wire 18.

[0045] As an embodiment of the present invention, refer to Figure 5Two second plug rods 24 connected to the heat insulation board 23 are vertically and movably inserted on the bottom wall of the air cabin 17, and a push plate 25 movably arranged in the air cabin 17 is installed on the top of the two second plug rods 24.

[0046] When the heat conducting plate 21 is squeezed upward by the material, it will drive the second plug rod 24 to move upward. The second plug rod 24 moves upward to push the push plate 25 upward, thereby increasing the pressure in the air chamber 17, assisting the first piston plate 28 to move upward, and increasing the thrust of the second push rod 31.

[0047] As an embodiment of the present invention, refer to Figure 5 An air bag 26 is installed on the push plate 25, and the air bag 26 is filled with ammonia.

[0048] Since ammonia has a large expansion coefficient, when the temperature in the air cabin 17 rises, the volume expanded by the ammonia is larger than when the air cabin 17 is filled with air. Therefore, the pressure in the air cabin 17 can be increased more effectively. At the same time, the ammonia is placed in the air bag 26 to ensure that the ammonia will not leak into the air and pollute the air.

[0049] Working principle: During the working process, firstly debug the device through the control panel 2, then pour the raw materials into the feed funnel 4, so that the raw materials enter the processing pipe 3 through the feed funnel 4 to be processed, and the molten material in the processing pipe 3 is first squeezed by the worm 5 into the pressurizing box 6. When the pressurizing box 6 is full of materials, since the worm 5 is still conveying materials into the pressurizing box 6, the pressure in the pressurizing box 6 increases. At this time, the heat conducting plate 21 is squeezed by the materials and slides upward along the inner wall of the protective sleeve 19. In the process of the heat conducting plate 21 sliding upward, the first push rod 22 vertically installed on its top wall drives the heat insulating plate 23 to break away from the contact with the second baffle 20 with a heat insulating effect, so that the temperature in the pressurizing box 6 can be transferred to the protective sleeve 19 and passed. The temperature in the air chamber 17 is increased by heat conduction. At the same time, the impact rod 33 installed at one end of the worm 5 and perpendicular to it rotates accordingly during the rotation of the worm 5. The impact force when the impact rod 33 contacts the piezoelectric ceramic 32 is used to trigger the piezoelectric ceramic 32 to generate electricity, which plays a role in supplying power and heating the heating wire 18. Under the action of the heating wire 18, the temperature in the air chamber 17 can be quickly increased, so that the pressure in the air chamber 17 increases, and when the pressurized box 6 is filled with materials, the heat conducting plate 21 will be squeezed by the materials and move upward, and the second plug rod 24 will be moved upward, and the push plate 25 will be pushed upward by the upward movement of the second plug rod 24. In addition, due to the large expansion coefficient of ammonia, when the temperature in the air chamber 17 rises, the ammonia is relatively large compared to when the air chamber 17 is filled with air. The volume of the expanded gas is larger, so the pressure in the air chamber 17 can be increased more effectively. At the same time, the ammonia is installed in the air bag 26, which ensures that the ammonia will not leak into the air and pollute the air. When the pressure in the air chamber 17 increases, the first piston plate 28 will be pushed upward, move up along the third cavity, and squeeze the second spring 30. In the process of the first piston plate 28 moving up, the second piston plate 29 will drive the second push rod 31 to move down along the fourth cavity. In the process of the second push rod 31 moving down, it will push the telescopic plate 15 to rotate, which drives the telescopic plate 15 to pressurize the material again. In the process of the rotation of the telescopic plate 15, it can squeeze the material in the pressurization box 6, so that the contact between the materials is closer, because in the initial state, the upper plate The side walls of 1501 and the lower plate 1503 are in contact with the inner wall of the pressurized box 6, and because the first spring 1502 pushes the lower plate 1503, during the rotation of the telescopic plate 15, the lower plate 1503 can always be in contact with the inner wall of the pressurized box 6, thereby preventing the material from overflowing into the cavity formed between the telescopic plate 15 and the pressurized box 6, and ensuring that the telescopic plate 15 can squeeze the material to make the material in close contact during the rotation. When the use is over, no more material continues to enter the pressurized box 6. Therefore, the temperature in the pressurized box 6 gradually decreases, and the temperature in the air cabin 17 decreases, so the pressure decreases. Under the joint action of the pressure and the second spring 30, the first piston plate 28 moves downward along the third cavity, causing the third cavity to be in a negative pressure state.Therefore, the second piston plate 29 drives the second push rod 31 to move upward to balance the pressure. At this time, the second push rod 31 no longer applies pressure to the upper plate 1501, and because the upper plate 1501 is made of magnetic material, after the two upper plates 1501 are not subject to external pressure, under the action of magnetic force, the two upper plates 1501 will repel each other and return to the initial state. At the same time, the gas mixed between the materials can pass through the nano-material upper plate 1501 and flow out through the pores on the pressurizing box 6, thereby preventing the gas mixed between the materials from causing the quality of the film to deteriorate. When the pressure in the pressurizing box 6 is large enough, the pressing plate 11 will be squeezed. And slide along the circular hole, and drive the card plate 12 to move in the first cavity during the sliding process of the pressure plate 11. At the same time, the memory alloy 14 has a tendency to stretch when heated. Therefore, during the movement of the card plate 12, if the insertion hole on the card plate 12 is just above the first insertion rod 10, the memory alloy 14 will drive the first insertion rod 10 to be inserted into the insertion hole by pushing the mounting plate 13. When the first insertion rod 10 is pushed, it drives the first baffle 9 to retract into the first cavity. Therefore, when the pressure is large enough, the first baffle 9 can be automatically opened, which plays a role in preventing waste from being easily generated at the beginning of production due to the presence of gaps in the molding mold 8.

[0050] The electrical components appearing in this article are all connected to the external main controller and 220V AC power through a transformer, and the main controller can be a conventional known device that controls a computer, etc. The product model provided by the present invention is only used for the technical solution according to the structural characteristics of the product. The product will be adjusted and modified after purchase to make it more matching and consistent with the technical solution of the present invention. It is a technical solution for the best application of the technical solution. The model of its product can be replaced and modified according to the required technical parameters, which is well known to technical personnel in this field. Therefore, technical personnel in this field can clearly obtain the corresponding use effect through the technical solution provided by the present invention.

[0051] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An EVA plastic film extruder, comprising a chassis (1), a control panel (2) and a processing pipeline (3) being mounted on the chassis (1), a feed funnel (4) being mounted on the top wall of the processing pipeline (3), Features: A worm (5) is installed in the processing pipe (3) so as to rotate horizontally. A pressurizing box (6) is installed at one end of the processing pipe (3). A plurality of heat dissipation ports are provided on the top and bottom walls of the pressurizing box (6). A mounting block (7) is installed on the side wall of the pressurizing box (6). A shaping mold (8) extending into the pressurizing box (6) is horizontally inserted on the side wall of the mounting block (7). Two cavities are provided on the mounting block (7). A first baffle (9) extending into the cavity is vertically and movably inserted on the top and bottom walls of the shaping mold (8). A first insertion rod (10) is vertically installed at one end of each of the first baffles (9) located in the cavity. A circular hole extending into the pressurizing box (6) is provided on the side wall of each of the cavities. A pressure plate (11) is horizontally and movably provided in each of the circular holes. A pressure plate (11) is horizontally and fixedly installed on each of the pressure plates (11). A card plate (12) extending into the cavity, each of the card plates (12) is provided with a plug hole adapted to the first plug rod (10), each of the first plug rods (10) is horizontally mounted with a mounting plate (13), each of the mounting plates (13) is mounted with a memory alloy (14) extending to the inner wall of the shaping mold (8), a telescopic plate (15) is hingedly connected to the inner top wall and the inner bottom wall of the pressurizing box (6), a cylinder (16) for driving the telescopic plate (15) to rotate is vertically mounted on the top wall and the bottom wall of the pressurizing box (6), two air chambers (17) connected to the air inlet of the cylinder (16) are vertically mounted in the pressurizing box (6), an electric heating wire (18) is wound on the outer wall of the air chamber (17), a protective sleeve (19) is provided on the outer jacket of the electric heating wire (18), and a trigger mechanism for triggering the air chamber (17) to heat up is provided on the protective sleeve (19); During the movement of the card plate (12), if the insertion hole on the card plate (12) is located just above the first insertion rod (10), the memory alloy (14) will drive the first insertion rod (10) to be inserted into the insertion hole by pushing the mounting plate (13), and when the first insertion rod (10) is pushed, the first baffle (9) is driven to retract into the first cavity, so that the first baffle (9) can be automatically opened when the pressure is large enough; The trigger mechanism comprises a second baffle (20) mounted on the inner wall of the protective sleeve (19), a heat conducting plate (21) being movably arranged in the protective sleeve (19), a first push rod (22) being vertically mounted on the top wall of the heat conducting plate (21) and extending to the top wall of the second baffle (20), a heat insulating plate (23) being mounted on the top end of the first push rod (22), the diameter of the heat insulating plate (23) being larger than the inner diameter of the second baffle (20) and smaller than the outer diameter of the second baffle (20).

2. An EVA plastic film extruder according to claim 1, Features: A partition plate (27) is vertically installed in each of the two cylinders (16), and the partition plate (27) divides the cylinder (16) into a third cavity and a fourth cavity. A first piston plate (28) and a second piston plate (29) are movably arranged in the third cavity and the fourth cavity, respectively. A first spring (1502) is arranged between the first piston plate (28) and the inner wall of the cylinder (16), and a second push rod (31) extending to the surface of the upper plate (1501) is vertically installed on the second piston plate (29).

3. An EVA plastic film extruder according to claim 1, Features: The telescopic plate (15) comprises an upper plate (1501) made of a magnetic material, the upper plate (1501) being provided with a groove, a connecting rod (1504) being movably arranged in the groove, a lower plate (1503) made of a nano material which is in contact with the bottom wall of the upper plate (1501) being fixedly mounted on one end of the connecting rod (1504), and a first spring (1502) connected to the groove being mounted on one end of the connecting rod (1504).

4. An EVA plastic film extruder according to claim 1, Features: A piezoelectric ceramic (32) connected in series with the heating wire (18) is fixedly mounted on the inner wall of the processing pipe (3), and a striking rod (33) having the same length as the inner diameter of the processing pipe (3) is vertically mounted on one end of the worm (5).

5. An EVA plastic film extruder according to claim 1, Features: Two second insertion rods (24) connected to the heat insulation board (23) are vertically and movably inserted on the bottom wall of the air chamber (17), and a push plate (25) movably arranged in the air chamber (17) is commonly mounted on the top ends of the two second insertion rods (24).

6. An EVA plastic film extruder according to claim 5, Features: An air bag (26) is installed on the push plate (25), and the air bag (26) is filled with ammonia gas.

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