A sectional temperature control type screw for polyethylene film extrusion

Abstract

This application relates to a zoned temperature-controlled screw for polyethylene film extrusion, belonging to the technical field of plastic extrusion molding equipment. It includes a base and a cylinder. An mounting plate is fixedly connected to one end of the inner wall of the cylinder, and a screw body is rotatably connected to one side of the mounting plate. An axial cavity is formed inside the screw body, and three partitions are arranged within the cavity, dividing it into a feeding section, a compression section, and a homogenization section. A circulation conduit is fixedly inserted through one side of each of the three partitions. This application, by creating a cavity inside the screw body and using three partitions to divide the cavity into a feeding section, a compression section, and a homogenization section adapted to the material handling process, along with the circulation conduits on each partition, enables independent temperature control of different functional sections of the screw. The spiral guide grooves on the inner wall of the cavity allow for more uniform flow of the circulating temperature control medium within each section, further improving temperature control accuracy and efficiency.

Description

Technical Field

[0001] This application relates to plastic extrusion molding equipment, and more particularly to a zoned temperature-controlled screw for polyethylene film extrusion. Background Technology

[0002] High-density polyethylene (HDPE) film, with its excellent flexibility, corrosion resistance, and light transmittance, is widely used in food packaging, agricultural covering, industrial protection, and other fields. Market demand continues to grow. In the production process of HDPE film, extrusion molding is the core process. As the core actuator of the extrusion equipment, the screw's effect on material conveying, melting, plasticizing, and mixing determines the final film's melt uniformity, mechanical properties, and appearance quality. Therefore, the temperature control of the screw becomes a key factor affecting the quality of polyethylene film products.

[0003] Existing technologies already contain optimized solutions for extrusion efficiency and preliminary material treatment. For example, a screw extruder for packaging polyethylene film, authorized by CN202022258027.4, improves material melting smoothness by opening a heating chamber inside the extrusion tube and installing a heating pipe. It also reduces heat loss and prevents burns by using an insulation layer. Furthermore, it breaks up agglomerated materials and filters raw material impurities through a stirring rod in the feed barrel and a filter screen, which improves material conveying stability and preliminary purification effect to a certain extent. However, the core heating logic of this solution still focuses on overall temperature control outside the extrusion tube and does not design for the differentiated temperature requirements of the screw body and different functional sections of the screw. It only indirectly conducts heat to the screw through external heating, which makes it impossible to accurately match the temperature of each section of the screw with the material plasticizing process. This can easily lead to problems such as insufficient preheating of materials in the feeding section and local overheating and degradation in the homogenization section, making it difficult to meet the production requirements of high-quality polyethylene film.

[0004] In response to the problem in the aforementioned comparative documents that external overall heating cannot meet the multi-segment temperature control requirements of the screw, this application proposes a zoned temperature-controlled screw for polyethylene film extrusion, which solves the above problem by implementing different temperature controls in different areas inside the screw. Utility Model Content

[0005] The purpose of this application is to provide a zoned temperature-controlled screw for polyethylene film extrusion, which has advantages such as improving the uniformity of material plasticization and solves the problem that existing polyethylene film extrusion screws cannot control temperature in zones.

[0006] This application provides a zoned temperature-controlled screw for polyethylene film extrusion, employing the following technical solution: It includes a base and a cylinder. An mounting plate is fixedly connected to one end of the inner wall of the cylinder. A screw body is rotatably connected to one side of the mounting plate. An axial cavity is formed inside the screw body. Three partitions are arranged within the cavity, dividing it into a feeding section, a compression section, and a homogenization section. A circulation conduit is fixedly threaded through one side of each of the three partitions. One end of the circulation conduit extends to the outside of the screw body. A connecting cylinder is fixedly connected to one end of the screw body. A second gear is fixedly connected to the surface of the connecting cylinder. A vertical plate is fixedly connected to the top of the base. A motor is fixedly mounted on one side of the vertical plate. A first gear is fixedly connected to one end of the motor's output shaft via a fastener. The first gear meshes with the second gear. A groove is formed on the inner wall of the cavity. The partitions are rotatably connected within the groove. Spiral guide grooves are formed in each of the three sections of the cavity.

[0007] By adopting the above technical solution, a cavity is opened inside the screw body, and three baffles are used to divide the cavity into a feeding section, a compression section, and a homogenization section adapted to the material handling process. With the circulation guide tubes on each baffle, independent temperature control of different functional sections of the screw can be achieved. The spiral guide grooves on the inner wall of the cavity can make the circulating temperature control medium flow more evenly in each section, further improving the temperature control accuracy and efficiency. The motor drives the screw body to rotate stably through the meshing transmission of the first gear and the second gear. When the screw body rotates, the baffles and circulation guide tubes will not rotate with it due to the rotation of the baffles in the grooves.

[0008] Preferably, the top of the base is fixedly connected to multiple connecting brackets, and the multiple connecting brackets are all fixedly installed on the surface of the cylinder.

[0009] By adopting the above technical solution, the multiple connecting frames at the top of the base can provide stable support for the cylinder, effectively preventing the cylinder from shaking or shifting during screw rotation and material extrusion, thus ensuring the overall structural stability of the equipment.

[0010] Preferably, a feed cylinder is fixedly connected to the top of the cylinder, and a protective cover is movably connected to the top of the feed cylinder via a hinge.

[0011] By adopting the above technical solution, the protective cover of the hinge connection can be closed when no material is being fed, which can prevent external dust and impurities from falling into the feed cylinder and contaminating the raw materials, and avoid impurities affecting the purity and quality of the film.

[0012] Preferably, a protective shell is fixedly connected to the top of the base, and the cylindrical body is located inside the protective shell.

[0013] By adopting the above technical solution, the protective shell on the top of the base can enclose the core components such as the cylinder and screw body, which can isolate them from external collisions and impacts and protect the core components from damage.

[0014] Preferably, the top of the protective shell is fixedly connected to two ventilation cylinders, each of which is fixedly connected to a mounting bracket, and an exhaust fan is fixedly installed at the bottom of the mounting bracket.

[0015] By adopting the above technical solution, the exhaust fan inside the ventilation duct at the top of the protective shell can accelerate the air circulation inside the protective shell when the equipment generates a lot of heat during operation, and promptly remove excess heat to prevent the temperature inside the protective shell from being too high and affecting the normal operation of core components and temperature control accuracy.

[0016] Preferably, a handle is fixedly connected to one side of the base, and an anti-slip sleeve is fixedly installed on the surface of the handle. Universal wheels are fixedly connected to the bottom of the base near the four corners, and brake pads are provided inside the universal wheels.

[0017] By adopting the above technical solutions, the anti-slip sleeve can increase the friction between the hand and the handle, preventing the hand from slipping when pushing. The swivel wheels at the bottom can flexibly adjust the position of the equipment to adapt to different production site layout requirements. The brake pads can lock the swivel wheels after the equipment is positioned to prevent the equipment from moving on its own.

[0018] Preferably, an electric push rod is fixedly connected to the bottom of the base near the universal wheel, and one end of the electric push rod is fixedly connected to a base plate.

[0019] By adopting the above technical solution, the electric push rod at the bottom of the base can push the base plate downward. When the equipment is on uneven ground or when stronger stability is required, the contact between the base plate and the ground can increase the support area and further improve the stability of the equipment.

[0020] Preferably, a conical discharge port is fixedly connected to one end of the cylinder, temperature sensors are embedded in the inner walls of the three sections of the cavity, and a placement groove is opened on one side of the base, in which two placement boxes are slidably connected.

[0021] By adopting the above technical solution, the temperature sensors on the inner walls of each section of the cavity can monitor the temperature of each section in real time, making it convenient for operators to keep track of the temperature control situation. If the temperature deviates from the set value, the circulating medium can be quickly adjusted to ensure the accuracy of zoned temperature control.

[0022] In summary, this application includes at least one of the following beneficial technical effects: This is a zoned temperature-controlled screw for polyethylene film extrusion. It features a cavity inside the screw body, divided into a feeding section, a compression section, and a homogenization section by three partitions adapted to the material handling process. Combined with circulation guides on each partition, independent temperature control of different functional sections of the screw can be achieved. The spiral guide grooves on the inner wall of the cavity ensure more uniform flow of the circulating temperature-controlled medium within each section, further improving temperature control accuracy and efficiency. The motor drives the screw body to rotate stably through the meshing of the first and second gears. While the screw body rotates, the partitions and circulation guides do not rotate due to the rotation of the partitions within their grooves. Attached Figure Description

[0023] Figure 1 This is a frontal cross-sectional structural diagram of this application; Figure 2 This is a schematic diagram of the main structure of the screw in this application; Figure 3 This is a top-view three-dimensional structural schematic diagram of this application; Figure 4 This is a schematic diagram of the U-shaped disturbance plate in this application; Figure 5 for Figure 1 Enlarged structural diagram at point A in the middle.

[0024] In the diagram: 1. Base; 2. Connecting frame; 3. Cylinder; 4. Screw body; 5. Cavity; 6. Partition plate; 7. Circulation conduit; 8. Mounting plate; 9. Groove; 10. Spiral guide channel; 11. Protective shell; 12. Conical discharge port; 13. Placement slot; 14. Placement box; 15. Ventilation duct; 16. Mounting frame; 17. Exhaust fan; 18. Anti-slip sleeve; 19. Handle; 20. Electric push rod; 21. Base plate; 22. Casters; 23. Brake pad; 24. Second gear; 25. Connecting cylinder; 26. Vertical plate; 27. First gear; 28. Motor; 29. ​​Feed cylinder; 30. Protective cover. Detailed Implementation

[0025] The following is in conjunction with the appendix Figure 1 - Appendix Figure 5 This application will be described in further detail below.

[0026] Example 1: A zoned temperature-controlled screw for polyethylene film extrusion, referring to... Figure 1 , Figure 2 and Figure 5The system includes a base 1 and a cylinder 3. An mounting plate 8 is fixedly connected to one end of the inner wall of the cylinder 3. A screw body 4 is rotatably connected to one side of the mounting plate 8. An axial cavity 5 is formed inside the screw body 4. Three partitions 6 are installed within the cavity 5, dividing it into a feeding section, a compression section, and a homogenization section. A circulation conduit 7 is fixedly inserted through one side of each of the three partitions 6, with one end extending to the outside of the screw body 4. A connecting cylinder 25 is fixedly connected to one end of the screw body 4. A second gear 24 is fixedly connected to the surface of the connecting cylinder 25. A vertical plate 26 is fixedly connected to the top of the base 1. A motor 28 is fixedly installed on one side of the vertical plate 26. A first gear 27 is fixedly connected to one end of the output shaft of the motor 28 via a fastener. The first gear 27 meshes with the second gear 24. The inner wall of cavity 5 is provided with groove 9, and partition 6 is rotatably connected in groove 9. Spiral guide grooves 10 are provided in the three sections of cavity 5. By opening cavity 5 inside screw body 4 and using three partitions 6 to divide cavity 5 into feeding section, compression section and homogenization section adapted to material processing flow, and with the circulation guide 7 on each partition 6, independent temperature control of different functional sections of screw can be achieved. With the help of spiral guide grooves 10 on the inner wall of cavity 5, the circulating temperature control medium can flow more evenly in each section, further improving temperature control accuracy and efficiency. Motor 28 drives screw body 4 to rotate stably through the meshing transmission of first gear 27 and second gear 24. When screw body 4 rotates, the partition 6 and circulation guide 7 will not rotate with it due to the rotation of partition 6 in groove 9.

[0027] Example 2: A zoned temperature-controlled screw for polyethylene film extrusion, referring to... Figure 1 , Figure 3 and Figure 4 The top of the base 1 is fixedly connected to multiple connecting brackets 2, which are all fixedly installed on the surface of the cylinder 3. The multiple connecting brackets 2 on the top of the base 1 can provide stable support for the cylinder 3, effectively preventing the cylinder 3 from shaking or shifting during screw rotation and material extrusion, and ensuring the overall structural stability of the equipment. The top of the cylinder 3 is fixedly connected to a feed cylinder 29, and the top of the feed cylinder 29 is movably connected to a protective cover 30 via a hinge. The protective cover 30 connected by the hinge can be closed when no material is being fed, which can prevent external dust and impurities from falling into the feed cylinder 29 and contaminating the raw materials, and avoid impurities affecting the purity and quality of the film. The top of the base 1 is fixedly connected to a protective shell 11, and the cylinder 3 is located inside the protective shell 11. The protective shell 11 on the top of the base 1 can wrap the cylinder 3, screw body 4 and other core components inside, which can isolate external collisions and impacts and protect the core components from damage.

[0028] Example 3: A zoned temperature-controlled screw for polyethylene film extrusion, referring to... Figure 1 , Figure 3 and Figure 4Two ventilation ducts 15 are fixedly connected to the top of the protective shell 11. Each ventilation duct 15 has a mounting bracket 16 fixedly connected inside. An exhaust fan 17 is fixedly installed at the bottom of the mounting bracket 16. The exhaust fan 17 inside the ventilation ducts 15 at the top of the protective shell 11 can accelerate airflow inside the protective shell 11 when the equipment generates a lot of heat during operation, promptly dissipating excess heat and preventing the temperature inside the protective shell 11 from becoming too high and affecting the normal operation of core components and temperature control accuracy. A handle 19 is fixedly connected to one side of the base 1. An anti-slip sleeve 18 is fixedly installed on the surface of the handle 19. Universal wheels 22 are fixedly connected to the bottom of the base 1 near the four corners. Brake pads 23 are installed inside the universal wheels 22. The anti-slip sleeve 18 increases the friction between the hand and the handle 19, preventing slippage when pushing. The universal wheels 22 at the bottom can flexibly adjust the equipment position to adapt to different production site layout requirements. The universal wheels 22 can be locked after the equipment is positioned to prevent the equipment from moving on its own. Electric push rods 20 are fixedly connected to the bottom of the base 1 near the universal wheels 22. One end of the electric push rods 20 is fixedly connected to the base plate 21. The electric push rods 20 at the bottom of the base 1 can push the base plate 21 to move downward. When the equipment is on uneven ground or when stronger stability is required, the contact between the base plate 21 and the ground can increase the support area and further improve the stability of the equipment. One end of the cylinder 3 is fixedly connected to a conical discharge port 12. Temperature sensors are embedded in the inner walls of the three sections of the cavity 5. A placement groove 13 is opened on one side of the base 1. Two placement boxes 14 are slidably connected in the placement groove 13. The temperature sensors on the inner walls of each section of the cavity 5 can monitor the temperature of each section in real time, so that the operator can keep track of the temperature control situation in time. If the temperature deviates from the set value, the circulating medium can be quickly adjusted to ensure the accuracy of zone temperature control.

[0029] The implementation principle of this application embodiment is as follows: When using the zoned temperature-controlled screw for polyethylene film extrusion, the equipment is pushed by the handle 19 with anti-slip sleeve 18 on one side of the base 1. The position of the equipment is flexibly adjusted by the universal wheels 22 at the bottom of the base 1. After the equipment moves to the target station, the brake pad 23 on the universal wheels 22 is stepped on to achieve initial fixation. Then, the electric push rod 20 at the bottom of the base 1 near the universal wheels 22 is started, so that the electric push rod 20 pushes the base plate 21 downward to contact the ground, further increasing the support area of ​​the equipment and improving the stability during operation. After the equipment is positioned, the protective cover 30 of the feed cylinder 29 is opened, and the polyethylene raw material to be processed is poured into the feed cylinder 29 at a uniform speed. The raw material enters the cylinder 3 through the feed cylinder 29. After the raw material is added, the protective cover 30 is closed, and the motor 2 on the top upright plate 26 of the base 1 is turned on first. 8. The output shaft of motor 28 drives the first gear 27 to rotate through the fixing component. Since the first gear 27 meshes with the second gear 24 on the surface of the connecting cylinder 25 at one end of the screw body 4, the first gear 27 will drive the second gear 24, the connecting cylinder 25 and the screw body 4 to rotate synchronously. At the same time, through the circulation conduits 7 on the three partitions 6, the appropriate temperature control medium is introduced into the feeding section, compression section and homogenization section of the cavity 5 respectively. The preheating medium is introduced into the feeding section to provide preliminary preheating for the raw materials and avoid insufficient preheating of the raw materials from affecting the conveying efficiency. The spiral guide grooves 10 in each section of the cavity 5 can make the temperature control medium flow evenly in the section, further improving the temperature control accuracy. When the screw body 4 rotates, the partitions 6 rotate synchronously in the grooves 9 on the inner wall of the cavity 5, ensuring that the partitions 6 and the circulation conduits 7 do not rotate with the screw body 4, ensuring stable conveying of the temperature control medium.

Claims

1. A zoned temperature-controlled screw for polyethylene film extrusion, comprising a base (1) and a barrel (3), characterized in that: One end of the inner wall of the cylinder (3) is fixedly connected to an installation plate (8), and a screw body (4) is rotatably connected to one side of the installation plate (8). A cavity (5) is axially opened inside the screw body (4), and three partitions (6) are provided inside the cavity (5). The three partitions (6) divide the cavity (5) into a feeding section, a compression section, and a homogenization section. A circulation conduit (7) is fixedly inserted through one side of each of the three partitions (6). One end of the circulation conduit (7) extends to the outside of the screw body (4), and a connecting cylinder (25) is fixedly connected to one end of the screw body (4). The surface of the connecting cylinder (25) is fixedly connected to the second gear (24), the top of the base (1) is fixedly connected to the upright plate (26), the side of the upright plate (26) is fixedly installed with the motor (28), one end of the output shaft of the motor (28) is fixedly connected to the first gear (27) through the fastener, the first gear (27) meshes with the second gear (24), the inner wall of the cavity (5) is provided with a groove (9), the partition plate (6) is rotatably connected in the groove (9), and the three sections of the cavity (5) are provided with spiral guide grooves (10).

2. The zoned temperature-controlled screw for polyethylene film extrusion according to claim 1, characterized in that: The top of the base (1) is fixedly connected to multiple connecting brackets (2), and the multiple connecting brackets (2) are all fixedly installed on the surface of the cylinder (3).

3. The zoned temperature-controlled screw for polyethylene film extrusion according to claim 1, characterized in that: The top of the cylinder (3) is fixedly connected to a feed cylinder (29), and the top of the feed cylinder (29) is movably connected to a protective cover (30) via a hinge.

4. A zoned temperature-controlled screw for polyethylene film extrusion according to claim 1, characterized in that: The base (1) is fixedly connected to a protective shell (11) on its top, and the cylinder (3) is located inside the protective shell (11).

5. A zoned temperature-controlled screw for polyethylene film extrusion according to claim 4, characterized in that: The top of the protective shell (11) is fixedly connected to two ventilation cylinders (15), and each of the two ventilation cylinders (15) is fixedly connected to a mounting bracket (16). An exhaust fan (17) is fixedly installed at the bottom of the mounting bracket (16).

6. A zoned temperature-controlled screw for polyethylene film extrusion according to claim 1, characterized in that: A handle (19) is fixedly connected to one side of the base (1), and an anti-slip sleeve (18) is fixedly installed on the surface of the handle (19). Universal wheels (22) are fixedly connected to the bottom of the base (1) near the four corners, and brake pads (23) are provided inside the universal wheels (22).

7. A zoned temperature-controlled screw for polyethylene film extrusion according to claim 6, characterized in that: Electric push rods (20) are fixedly connected to the bottom of the base (1) on the side near the universal wheel (22), and a base plate (21) is fixedly connected to one end of each electric push rod (20).

8. A zoned temperature-controlled screw for polyethylene film extrusion according to claim 1, characterized in that: One end of the cylinder (3) is fixedly connected to a conical discharge port (12). Temperature sensors are embedded in the inner walls of the three sections of the cavity (5). A placement groove (13) is opened on one side of the base (1). Two placement boxes (14) are slidably connected in the placement groove (13).

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