An extrusion device for the production of HDPE plastic particles and its production process

Abstract

The present application relates to an extrusion device for producing HDPE plastic particles and its production process, wherein the extrusion device includes a barrel, a screw and a driving motor, a hopper and a die are provided on the barrel, two side barrels are connected on the two opposite side walls of the barrel, a closing portion is provided at the part of the screw near the side barrel, a plurality of annular stirring plates spaced in sequence along the axial direction of the screw are provided on the closing portion, the annular stirring plate balls are hinged to the closing portion, and a synchronous member is provided between two adjacent annular stirring plates for maintaining a parallel posture between the two; a feeding mechanism for intermittently drawing and pushing the molten material in the barrel into the side barrel is provided in the side barrel; the feeding mechanism is also configured to achieve alternating high-frequency impact of the molten material in the two relatively arranged side barrels on the annular stirring plates. The present application has the effect of improving the problem that the material in the extrusion device is difficult to mix evenly during the extrusion process, thereby causing adverse effects on product quality, production efficiency, equipment life and other aspects.

Description

Technical Field

[0001] The present application relates to the technical field of plastic granule extrusion, and in particular to an extrusion device and a production process thereof for producing HDPE plastic granules. Background Art

[0002] At present, plastic granulators are mainly used to process waste plastic films, such as industrial packaging films, agricultural mulch films, greenhouse films, beer bags, handbags, woven bags, agricultural convenience bags, basins, barrels, beverage bottles, furniture, daily necessities, etc. They are suitable for most common waste plastics and are the most widely used, most widely used and most popular plastic recycling processing machinery in the waste plastic recycling industry.

[0003] In the related art, Chinese patent application number CN202110369342.0 proposes a production line for HDPE plastic granulation, including a feeding device, a cutting device, a cleaning device, a conveying device, and an extruder. The feeding device includes a feeding box and a screw conveyor. The cutting device includes a cutting box connected to the screw conveyor; the cleaning device includes a cleaning tank, the outlet of the cutting box is arranged toward the cleaning tank; the conveying device includes a conveyor belt arranged on the cleaning tank; the extruder includes an extruder arranged below the end of the conveyor belt, and the discharge port of the extruder is provided with a cooling tank; the feeding box is provided with a feeding roller, a feeding plate, and a turntable. The feeding plate is located below the turntable, which is rotatably mounted in the feeding box and has several baffles on it. The feeding plate is movably mounted in the feeding box, and the feeding box is provided with a feeding pipe. The end of the feeding pipe is connected to the feed port of the screw conveyor. This invention has the effect of facilitating orderly feeding of the production line and improving work efficiency.

[0004] The above-mentioned related technologies have the following defects: extrusion devices are usually used to process waste plastics. However, waste materials are often mixed from multiple plastics. The melting point, fluidity, viscosity and other physical properties of different plastics vary greatly, which greatly increases the difficulty of the extrusion device in mixing materials evenly during extrusion processing, thereby adversely affecting many aspects such as product quality, production efficiency and equipment life. Summary of the Invention

[0005] In order to improve the problem that the material is difficult to mix evenly during the extrusion process in the extrusion device, thereby causing adverse effects on many aspects such as product quality, production efficiency and equipment life, the present application provides an extrusion device and a production process for the production of HDPE plastic particles.

[0006] The first aspect of the present application provides an extrusion device for producing HDPE plastic particles, which adopts the following technical solution:

[0007] An extrusion device for producing HDPE plastic particles, comprising a barrel, a screw disposed in the barrel, and a drive motor coaxially fixed to the rear end of the screw, the barrel being provided with a main hopper and a die, the barrel being connected to side barrels on both opposite side walls, the screw being provided with a closing portion near the side barrel, the closing portion being provided with a plurality of annular stirring plates spaced in sequence along the axial direction of the screw, the middle portions of the annular stirring plates being spherically hinged to the closing portion, and a co-moving member being provided between two adjacent annular stirring plates for maintaining a parallel posture between the two plates;

[0008] The side barrel is provided with a feeding mechanism for intermittently drawing the molten material in the barrel into and pushing it out into the side barrel; the feeding mechanism is also configured to realize alternating and high-frequency impact of the molten material in the two relatively arranged side barrels on the annular stirring plate.

[0009] Furthermore, a plurality of ball heads are fixedly connected to the outer wall of the closing portion at equal intervals, a ball sleeve is mounted on the ball head, and the middle portion of the annular stirring plate is fixedly connected to the outer peripheral wall of the ball sleeve.

[0010] Furthermore, the co-moving member is configured as a permanent magnet fixed to the annular stirring plate, the two permanent magnets on two adjacent annular stirring plates magnetically repel each other, and the permanent magnets are distributed circumferentially along the annular stirring plate.

[0011] Furthermore, a mounting groove is provided on the annular stirring plate, and the permanent magnet is embedded in the mounting groove to be fixedly connected to the annular stirring plate.

[0012] Furthermore, the closing portion is provided at an end of the screw close to the driving motor, and an angle between the side barrel and the end of the barrel close to the driving motor is an acute angle.

[0013] Furthermore, the discharging direction of the side barrel in the barrel points to the annular stirring plate closest to the driving motor.

[0014] Furthermore, the surface of the annular stirring plate is provided with a concave arc portion, and the inner arc side of the concave arc portion faces the discharge direction of the side barrel in the barrel.

[0015] Furthermore, a plurality of hollow portions are provided on the annular stirring plate away from the side tube discharge port.

[0016] Furthermore, the feeding mechanism includes a piston slidably arranged in the side tube, and a linear driving member for driving the piston to reciprocate is provided at one end of the side tube away from the material barrel; the two linear driving members in the two side tubes work alternately.

[0017] A second aspect of the present application provides a production process for producing HDPE plastic particles, based on the above-mentioned extrusion device for producing HDPE plastic particles, adopts the following technical solution:

[0018] A production process for producing HDPE plastic granules, comprising the following steps:

[0019] The raw material particles are put into the barrel from the hopper, heated and melted, and the screw is driven by the driving motor to rotate to transport the molten material to the die;

[0020] When the molten material flows through the closing portion, the feeding mechanism controls the two side cylinders to alternately suck and push out the molten material at high frequency, thereby improving the shear mixing effect on the molten material;

[0021] At the same time, the molten materials pushed out from the two side barrels impact the annular stirring plates alternately, causing the annular stirring plates rotating with the screw to swing disorderly, thereby improving the mixing effect of the molten materials; and under the action of the synchronous moving parts, multiple annular stirring plates perform the same disorderly swing.

[0022] In summary, the beneficial technical effects of this application are:

[0023] 1. The molten material, propelled by the screw, flows through the annular stirrer blades located at the constriction, further stirring and dispersing the flowing molten material, improving mixing uniformity. The annular stirrer blades are connected to the constriction via a ball joint. This connection allows the annular stirrer blades to move freely under the influence of the molten material's flow force, allowing them to more flexibly adapt to the flow state of the molten material and enhance their mixing efficiency. Furthermore, a co-acting member is provided between two adjacent annular stirrers to maintain their parallel position, helping to prevent the annular stirrers from colliding or misaligning during rotation, maintaining a stable mixing effect. Furthermore, with the coordinated action of the feed mechanisms in the side barrels on opposite sides of the barrel, the molten material in the barrel is continuously drawn in and out of the side barrels, alternating high-frequency impacts on the annular stirrer blades, intensifying the mixing process and allowing different portions of the molten material to more fully contact and exchange, thereby improving mixing uniformity. Furthermore, the impact action promotes the dispersion and refinement of the molten material, helping to eliminate bubbles, unmelted particles, or other inhomogeneities in the molten material. Finally, high-frequency impact will also affect the temperature distribution of the molten material, which helps to achieve a more uniform temperature distribution by increasing the heat exchange inside the molten material. At the same time, the high-frequency impact of the molten material may also cause vibration and fluctuation of the annular stirring plate. This vibration and fluctuation not only helps to mix and refine the molten material, but also affects the fluid dynamics environment around the annular stirring plate, promoting the overall flow and distribution of the molten material in the barrel. This effectively improves the problem of the difficulty in uniformly mixing materials during extrusion processing in the extrusion device, which has an adverse impact on product quality, production efficiency, equipment life and other aspects.

[0024] 2. When the molten material is pushed out of the side barrel and impacts the annular stirring plate, the angle and direction of the molten material being pushed out of the side barrel and impacting the annular stirring plate will change accordingly due to the different positions of the annular stirring plate and the material discharge direction of the side barrel. This makes the interlacing and penetration between the molten materials more frequent, thereby improving the mixing efficiency. At the same time, due to the positional difference between the annular stirring plate and the material discharge direction of the side barrel, the motion trajectory of the annular stirring plate is no longer a simple circular motion or linear motion, but becomes more complex and varied. This complex motion trajectory helps to increase the relative motion speed and frequency between the molten materials, thereby improving the mixing efficiency and uniformity of the molten materials.

[0025] 3. The permanent magnets on two adjacent annular stirring plates repel each other magnetically, generating a repulsive force between them. This force causes the two annular stirring plates to maintain a certain distance in their relative positions and automatically adjusts as the molten material impacts and stirs. This automatic synchronization and drive mechanism reduces dependence on external power sources and improves the overall efficiency and stability of the system. At the same time, tiny vibrations and swings are generated during the stirring process. These vibrations and swings help break up adhesion and agglomeration between the molten materials and promote mixing and dispersion between the molten materials. In addition, since the permanent magnets are distributed circumferentially along the annular stirring plates, the annular stirring plates are subjected to uniform magnetic force during rotation, thereby ensuring that the molten material is fully mixed in all directions. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of a partial cross-sectional structure of an embodiment of the present application;

[0027] Figure 2 It is a right side structural diagram of an embodiment of the present application;

[0028] Figure 3 It is along Figure 2 Schematic diagram of the cross-sectional structure along the AA line;

[0029] Figure 4 yes Figure 3 A partial enlarged schematic diagram of part B.

[0030] Explanation of the reference numerals: 1. Barrel; 11. Hopper; 12. Mouth die; 13. Driving motor; 2. Screw; 21. Closing portion; 22. Ball head 3. Annular stirring plate; 31. Ball sleeve; 32. Concave arc portion; 33. Hollow portion; 34. Mounting groove; 4. Permanent magnet; 5. Side barrel; 61. Piston; 62. Linear drive member. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solution of this application in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0032] The present application discloses an extrusion device for producing HDPE plastic particles. Figures 1 to 4An extrusion device for producing HDPE plastic granules includes a barrel 1, a screw 2 disposed within the barrel 1, and a drive motor 13 coaxially fixed to the rear end of the screw 2. The barrel 1 is provided with a hopper 11 and a die 12. Side barrels 5 are connected to opposite side walls of the barrel 1. Both the barrel 1 and the side barrels 5 are equipped with heating devices. A closing portion 21 is provided near the side barrels 5 on the screw 2. A plurality of annular agitators 3 are spaced apart along the axial direction of the screw 2. The central portions of the annular agitators 3 are spherically hinged to the closing portion 21. A co-actuating member is provided between adjacent annular agitators 3 to maintain their parallel orientation.

[0033] At the same time, a feeding mechanism is provided in the side tube 5 for intermittently drawing the molten material in the barrel 1 into and pushing it out into the side tube 5, and the feeding mechanism is also configured to realize alternating high-frequency impact of the molten material in the two relatively arranged side tubes 5 on the annular stirring plate 3.

[0034] After such arrangement, when the HDPE plastic is plasticized and extruded, the drive motor 13 is first started and the barrel 1 is heated. The material is added to the barrel 1 through the hopper 11. After the material is heated and melted in the barrel 1, it moves toward the die 12 under the action of the screw 2. The molten material enters the cooling system immediately after being extruded from the die 12. The temperature is rapidly reduced by water cooling or air cooling to solidify it. The solidified material is cut into particles by the cutting device. During this process, the molten material is pushed by the screw 2 and flows through the annular stirring plate 3 provided on the closing portion 21, so that the flowing molten material is further stirred and dispersed, thereby improving its mixing uniformity. The annular stirring plate 3 is connected to the closing portion 21 by a ball hinge. This connection method allows the annular stirring plate 3 to have a certain amount of movement space under the action of the flow force of the molten material, thereby more flexibly adapting to the flow state of the molten material and improving its stirring effect.

[0035] Simultaneously, co-moving members are provided between adjacent annular stirrers 3 to maintain their parallel orientation. This helps prevent collision or misalignment during rotation, maintaining a stable stirring effect. Furthermore, with the coordinated action of the feed mechanisms within the side barrels 5 on opposite sides of the barrel 1, the molten material within the barrel 1 is continuously drawn into and out of the side barrels 5, alternatingly impacting the annular stirrers 3 at high frequencies. This intensifies the mixing process, allowing different portions of the molten material to more fully contact and exchange, thereby improving mixing uniformity.

[0036] Secondly, the impact effect also promotes the dispersion and refinement of the molten material, helping to eliminate bubbles, unmelted particles or other uneven phenomena in the molten material. Finally, the high-frequency impact will also affect the temperature distribution of the molten material, and by increasing the heat exchange inside the molten material, it will help to achieve a more uniform temperature distribution; at the same time, the high-frequency impact of the molten material may also cause vibration and fluctuation of the annular stirring plate 3. This vibration and fluctuation not only helps to mix and refine the molten material, but also affects the fluid dynamics environment around the annular stirring plate 3, promoting the overall flow and distribution of the molten material in the barrel 1. It effectively improves the problem that the extrusion device is difficult to mix the material evenly during the extrusion process, thereby adversely affecting many aspects such as product quality, production efficiency and equipment life.

[0037] Moreover, when the molten material is pushed out from the side tube 5 and impacts the annular stirring plate 3, due to the different positions of the annular stirring plate 3 and the side tube 5 in the discharge direction, the angle and direction of the molten material being pushed out from the side tube 5 and impacting the annular stirring plate 3 will also change accordingly, making the interlacing and penetration between the molten materials more frequent, thereby improving the mixing efficiency; at the same time, due to the position difference between the annular stirring plate 3 and the side tube 5 in the discharge direction, the motion trajectory of the annular stirring plate 3 is no longer a simple circular motion or linear motion, but becomes more complex and changeable. This complex motion trajectory helps to increase the relative motion speed and frequency between the molten materials, thereby improving the mixing efficiency and uniformity of the molten materials.

[0038] Specifically, refer to Figures 2 to 4 A plurality of ball heads 22 are fixedly connected to the outer wall of the closing portion 21 at equal intervals. Ball sleeves 31 are mounted on the ball heads 22, and the middle portion of the annular stirring plate 3 is fixedly connected to the outer peripheral wall of the sleeve 31. The design of the ball heads 22 and the sleeve 31 provides a dynamically stable support structure for the annular stirring plate 3. Because the sleeve 31 can freely rotate or slightly swing on the ball heads 22, the annular stirring plate 3 has a certain degree of self-adaptability when impacted by molten material, reducing vibration and stress concentration caused by the rigid connection. Furthermore, when impacted by molten material, the annular stirring plate 3 not only rotates or swings with the impact of the material, but also produces a more complex motion trajectory through the interaction between the sleeve 31 and the ball heads 22. This complex motion helps to more fully mix and refine the molten material on the annular stirring plate 3, thereby improving the mixing effect.

[0039] Furthermore, refer to Figures 2 to 4 The moving member is a permanent magnet 4 fixed to the annular stirring plate 3. The two permanent magnets 4 on two adjacent annular stirring plates 3 magnetically repel each other. The permanent magnets 4 are distributed circumferentially along the annular stirring plates 3. Specifically, the permanent magnets 4 are arranged on the side of the annular stirring plate facing away from the drive motor 13 to reduce excessive impact of the molten material on the permanent magnets 4.

[0040] Due to the magnetic repulsion between the permanent magnets 4 on two adjacent annular stirring plates 3, a mutually repulsive force is generated between them. This force prompts the two annular stirring plates 3 to maintain a certain distance in their relative positions and automatically adjusts as the impact and stirring process of the molten material proceeds. This automatic synchronization and drive mechanism reduces dependence on external power sources and improves the overall efficiency and stability of the system. At the same time, tiny vibrations and swings are generated during the stirring process. Such vibrations and swings help break the adhesion and agglomeration between the molten materials and promote mixing and dispersion between the molten materials. Moreover, since the permanent magnets 4 are circumferentially distributed along the annular stirring plates 3, the annular stirring plates 3 are subjected to uniform magnetic force during rotation, thereby ensuring that the molten material can be fully mixed in all directions.

[0041] In other feasible embodiments, the co-moving parts can be multiple connecting rods arranged between two adjacent annular agitators, and the two ends of the connecting rods are flexibly connected or ball-hinged to the two annular agitators 3 to meet the requirement of keeping the two adjacent annular agitators 3 in a parallel posture as much as possible.

[0042] And refer to Figures 2 to 4 A mounting groove 34 is provided on the annular stirring plate 3, and the permanent magnet 4 is embedded in the mounting groove 34 and fixed to the annular stirring plate 3, so that the permanent magnet 4 will not loosen or fall off due to force during the stirring process, thereby improving the stability and reliability of the entire stirring system; at the same time, the design of the mounting groove 34 can also optimize the magnetic field distribution of the permanent magnet 4 on the annular stirring plate 3. By precisely controlling the position, shape and size of the mounting groove 34, it can be ensured that the magnetic field generated by the permanent magnet 4 during the stirring process can act evenly on the molten material, thereby improving the mixing effect and refinement degree.

[0043] And, refer to Figures 1 to 3 The closing portion 21 is located at the end of the screw 2 near the drive motor 13, and the angle between the side barrel 5 and the end of the barrel 1 near the drive motor 13 is acute. This design allows the molten material to have a higher speed and impact force when entering the closing portion 21. When the molten material is pushed out of the side barrel 5 and impacts the annular stirring plate 3, this high-speed impact helps to enhance the mixing effect and refinement of the material. At the same time, the acute angle between the side barrel 5 and the end of the barrel 1 near the drive motor 13 can also promote the flow of the molten material and reduce the amount of molten material remaining at the connection between the side barrel 5 and the barrel 1.

[0044] Furthermore, refer to Figures 1 to 3The discharge direction of the side barrel 5 in the barrel 1 points to the annular stirring plate 3 closest to the drive motor 13, so that the molten material is immediately subjected to the strong stirring action of the annular stirring plate 3 after leaving the side barrel 5. This design ensures that the molten material can quickly and fully contact the annular stirring plate 3, thereby improving mixing efficiency and mixing uniformity. The interaction between the rotation of the annular stirring plate 3 and the impact of the molten material helps to break up the agglomeration of particles in the molten material and promote the refinement of the molten material.

[0045] And, refer to Figures 1 to 4 The annular stirring plate 3 is provided with a concave arc portion 32, with the inner arc side of the concave arc portion 32 facing the discharge direction of the side barrel 5 in the barrel 1. The provision of the concave arc portion 32 can significantly improve the impact effect of the molten material pushed out of the side barrel 5 on the annular stirring plate 3, and the concave arc portion 32 can reduce or eliminate the dead corner area formed by the molten material in the barrel 1. At the same time, it can enable the annular stirring plate 3 to produce more complex fluid dynamic effects during rotation, thereby enhancing the stirring or mixing effect.

[0046] And, refer to Figure 1 The annular stirring paddles 3 located away from the discharge port of the side barrel 5 are provided with multiple hollow portions 33. These hollow portions 33 not only reduce the weight of the annular stirring paddles 3 but also optimize the stirring effect by changing the fluid dynamics around the annular stirring paddles 3. When the annular stirring paddles 3 located away from the drive motor 13 rotate with the screw 2 and swing with the annular stirring paddles 3 located near the side barrel 5, the hollow portions of the annular stirring paddles 3 generate strong eddies or turbulence, which helps to enhance the mixing and dispersion of the molten material.

[0047] At the same time, refer to Figure 2 and Figure 3 The feeding mechanism includes a piston 61 slidably disposed within the side barrel 5. A linear drive member 62 is provided at the end of the piston 61 away from the barrel 1 for driving the piston 61 to reciprocate. The linear drive member 62 can be a linear motor, a pneumatic cylinder, or a hydraulic cylinder. By controlling the movement of the linear drive member 62, the stroke and speed of the piston 61 can be precisely controlled, thereby achieving precise control of the molten material delivery rate to meet different production requirements.

[0048] In addition, a heating hood is provided on the outer wall of the side barrel 5, which can maintain the temperature of the side barrel 5 and the molten material inside it stable, and prevent temperature fluctuations caused by changes in ambient temperature; it can also perform additional heating on the molten material in the side barrel 5 to promote better melting and plasticization of the material in the closing part 21 of the barrel 1, thereby improving the plasticization efficiency of the entire extrusion system.

[0049] The present application also discloses a production process for producing HDPE plastic particles, based on the above-mentioned extrusion device for producing HDPE plastic particles, comprising the following steps:

[0050] The raw material particles are fed from the hopper 11 into the barrel 1, heated and melted, and the screw 2 is driven by the drive motor 13 to rotate to transport the molten material to the die 12;

[0051] When the molten material flows through the closing portion 21, the feeding mechanism controls the two side cylinders 5 to alternately suck and push out the molten material at high frequency, thereby improving the shear mixing effect on the molten material;

[0052] At the same time, the molten materials pushed out from the two side barrels 5 alternately impact the annular stirring plates 3, causing the annular stirring plates 3 rotating with the screw 2 to swing randomly, thereby improving the mixing effect of the molten materials; and under the action of the same moving parts, multiple annular stirring plates 3 perform the same random swing.

[0053] The implementation principle of an extrusion device for producing HDPE plastic particles in the embodiment of the present application is as follows:

[0054] When plasticizing and extruding HDPE plastic, the drive motor 13 is first started and the barrel 1 is heated. The material is added to the barrel 1 through the hopper 11. After the material is heated and melted in the barrel 1, it moves toward the die 12 under the action of the screw 2. The molten material enters the cooling system immediately after being extruded from the die 12. The temperature is quickly reduced by water cooling or air cooling to solidify it. The solidified material is cut into particles by a cutting device. During this process, the molten material is pushed by the screw 2 and flows through the annular stirring plate 3 provided on the closing part 21, so that the flowing molten material is further stirred and dispersed, thereby improving its mixing uniformity. The annular stirring plate 3 is connected to the closing part 21 by a ball hinge. This connection method allows the annular stirring plate 3 to have a certain amount of movement space under the action of the flow force of the molten material, thereby more flexibly adapting to the flow state of the molten material and improving its stirring effect.

[0055] Simultaneously, co-moving members are provided between adjacent annular stirrers 3 to maintain their parallel orientation. This helps prevent collision or misalignment during rotation, maintaining a stable stirring effect. Furthermore, with the coordinated action of the feed mechanisms within the side barrels 5 on opposite sides of the barrel 1, the molten material within the barrel 1 is continuously drawn into and out of the side barrels 5, alternatingly impacting the annular stirrers 3 at high frequencies. This intensifies the mixing process, allowing different portions of the molten material to more fully contact and exchange, thereby improving mixing uniformity.

[0056] Secondly, the impact effect also promotes the dispersion and refinement of the molten material, helping to eliminate bubbles, unmelted particles or other uneven phenomena in the molten material. Finally, the high-frequency impact will also affect the temperature distribution of the molten material, and by increasing the heat exchange inside the molten material, it will help to achieve a more uniform temperature distribution; at the same time, the high-frequency impact of the molten material may also cause vibration and fluctuation of the annular stirring plate 3. This vibration and fluctuation not only helps to mix and refine the molten material, but also affects the fluid dynamics environment around the annular stirring plate 3, promoting the overall flow and distribution of the molten material in the barrel 1. It effectively improves the problem that the extrusion device is difficult to mix the material evenly during the extrusion process, thereby adversely affecting many aspects such as product quality, production efficiency and equipment life.

[0057] Moreover, when the molten material is pushed out from the side tube 5 and impacts the annular stirring plate 3, due to the different positions of the annular stirring plate 3 and the side tube 5 in the discharge direction, the angle and direction of the molten material being pushed out from the side tube 5 and impacting the annular stirring plate 3 will also change accordingly, making the interlacing and penetration between the molten materials more frequent, thereby improving the mixing efficiency; at the same time, due to the position difference between the annular stirring plate 3 and the side tube 5 in the discharge direction, the motion trajectory of the annular stirring plate 3 is no longer a simple circular motion or linear motion, but becomes more complex and changeable. This complex motion trajectory helps to increase the relative motion speed and frequency between the molten materials, thereby improving the mixing efficiency and uniformity of the molten materials.

[0058] Unless otherwise defined, the technical or scientific terms used in this application shall have the usual meanings understood by persons of ordinary skill in the field to which this application belongs. The words "first", "second", "third" and similar terms used in the specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "one" or "a" do not indicate a quantity limitation, but rather indicate the existence of at least one. Words such as "include" or "comprise" mean that the elements or objects appearing before "include" or "comprises" cover the elements or objects listed after "include" or "comprises" and their equivalents, and do not exclude other elements or objects. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0059] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. An extrusion device for producing HDPE plastic particles, comprising a barrel (1), a screw (2) arranged in the barrel (1), and a drive motor (13) coaxially fixed to the rear end of the screw (2), wherein the barrel (1) is provided with a hopper (11) and a die (12), characterized in that: The two opposite side walls of the barrel (1) are both connected to side barrels (5), and the screw (2) is provided with a closing portion (21) near the side barrel (5). The closing portion (21) is provided with a plurality of annular stirring plates (3) spaced in sequence along the axial direction of the screw (2). The middle part of the annular stirring plates (3) is ball-hinged on the closing portion (21), and a co-moving member for maintaining a parallel posture between two adjacent annular stirring plates (3) is provided; The side barrel (5) is provided with a feeding mechanism for intermittently drawing the molten material in the barrel (1) into and pushing it out into the side barrel (5); the feeding mechanism is also configured to achieve alternating, high-frequency impact of the molten material in the two oppositely arranged side barrels (5) on the annular stirring plate (3); The closing portion (21) is provided at one end of the screw (2) close to the drive motor (13), and the angle between the side barrel (5) and the end of the barrel (1) close to the drive motor (13) is an acute angle; The surface of the annular stirring plate (3) is provided with a concave arc portion (32), and the inner arc side of the concave arc portion (32) faces the discharge direction of the side barrel (5) in the barrel (1); A plurality of hollow portions (33) are provided on the annular stirring plate (3) away from the discharge port of the side tube (5).

2. An extrusion device for producing HDPE plastic particles according to claim 1, characterized in that: A plurality of ball heads (22) are fixedly connected at equal intervals to the outer wall of the closing portion (21), a ball sleeve (31) is sleeved on the ball head (22), and the middle portion of the annular stirring plate (3) is fixedly connected to the outer peripheral wall of the ball sleeve (31).

3. The extrusion device for producing HDPE plastic particles according to claim 1, characterized in that: The co-moving member is configured as a permanent magnet (4) fixedly connected to the annular stirring plate (3), the two permanent magnets (4) on two adjacent annular stirring plates (3) magnetically repel each other, and the permanent magnets (4) are distributed circumferentially along the annular stirring plate (3).

4. The extrusion device for producing HDPE plastic particles according to claim 3, characterized in that: The annular stirring plate (3) is provided with a mounting groove (34), and the permanent magnet (4) is embedded in the mounting groove (34) to be fixedly connected to the annular stirring plate (3).

5. The extrusion device for producing HDPE plastic particles according to claim 1, characterized in that: The discharge direction of the side barrel (5) in the barrel (1) points to the annular stirring plate (3) closest to the drive motor (13).

6. An extrusion device for producing HDPE plastic particles according to any one of claims 1 to 5, characterized in that: The feeding mechanism comprises a piston (61) slidably arranged in the side tube (5), and a linear driving member (62) for driving the piston (61) to reciprocate is provided at one end of the side tube (5) away from the barrel (1); the two linear driving members (62) in the two side tubes (5) work alternately.

7. A production process for producing HDPE plastic particles, based on an extrusion device for producing HDPE plastic particles according to any one of claims 1 to 6, characterized in that: The following steps are involved: The raw material particles are put into the barrel (1) from the hopper (11), heated and melted, and the screw (2) is driven by the drive motor (13) to rotate to transport the molten material to the die (12); When the molten material flows through the closing portion (21), the feeding mechanism controls the two side cylinders (5) to alternately suck and push out the molten material at high frequency, thereby improving the shear mixing effect on the molten material; At the same time, the molten materials pushed out from the two side barrels (5) impact the annular stirring plates (3) alternately, causing the annular stirring plates (3) rotating along with the screw (2) to swing in a disordered manner, thereby improving the mixing effect of the molten materials; and under the action of the synchronous moving member, the multiple annular stirring plates (3) swing in the same disordered manner.

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