Double-screw mixing extruder for PE (polyethylene) grafted material production

Abstract

A double-screw mixing extruder for PE (polyethylene) grafting material production relates to the technical field of double-screw mixing extruders and comprises a base, a support seat is fixedly arranged on the front side of the upper end face of the base, a driving mechanism is arranged on the rear side of the upper end face of the base, a mixing drum is mounted above the front end of the driving mechanism, and a screw rod is mounted on the mixing drum. The rear end of the exterior of the mixing barrel is provided with a material injection mechanism, a material mixing barrel is arranged above the material injection mechanism, the material mixing barrel is internally provided with a multi-directional material mixing and scattering mechanism, the front side of the upper end face of the supporting seat is provided with a movable seat, the movable seat and the supporting seat are in sliding limiting, and a pelletizing device is fixedly arranged above the movable seat. According to the scheme, the problem that the PE grafted material is easy to agglomerate and block in the process of entering the mixing drum is solved.

Description

Technical Field

[0001] This utility model relates to the technical field of twin-screw compounding extruders, specifically a twin-screw compounding extruder for the production of PE grafted materials. Background Technology

[0002] The twin-screw compounding extruder for PE grafted compound production is a high-efficiency and professional plastic processing equipment. It enables the preparation of PE grafted compounds, achieving deep mixing and uniform dispersion of PE raw materials and graft monomers during extrusion through the combination of twin screws and compounding technology. By employing temperature and pressure control systems, the production environment can be precisely regulated to ensure sufficient chemical reaction of the PE grafted compound during extrusion.

[0003] For example, the Chinese authorized patent CN212045891U, entitled "A Twin-Screw Compounding Extruder", includes a frame, a metering and feeding mechanism, and a barrel. The barrel is connected to the metering and feeding mechanism. The inside of the barrel has a barrel groove that accommodates twin screws in the same direction. The two axes of the barrel groove are parallel, and a smooth semi-circular protrusion is provided between the bore walls. A heating rod is installed in the protrusion along its length. A housing and a stepper motor fixed to the outer wall of the housing are installed on the side of the barrel. The heating rod extends out of the barrel, is fixed inside the housing, and is connected to a controller inside the housing.

[0004] While the existing technologies can produce PE grafted materials, different raw materials tend to clump together when entering the mixing cylinder, resulting in uneven mixing and extrusion processes and affecting the production quality of PE grafted materials. Therefore, they do not meet current requirements. To address this, we propose a twin-screw mixing extruder for the production of PE grafted materials. Utility Model Content

[0005] The purpose of this invention is to provide a twin-screw compounding extruder for the production of PE grafted materials, so as to solve the problem mentioned in the background art that PE grafted materials are prone to agglomeration and clumping during the process of entering the compounding cylinder.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a twin-screw compounding extruder for PE grafting material production, comprising a base, a support seat fixedly disposed on the front side of the upper end face of the base, a drive mechanism disposed on the rear side of the upper end face of the base, a compounding cylinder mounted above the front end of the drive mechanism, an injection mechanism mounted on the rear end of the compounding cylinder, a mixing cylinder disposed above the injection mechanism, a multi-directional mixing and dispersing mechanism disposed inside the mixing cylinder, a movable seat mounted on the front side of the upper end face of the support seat, and the movable seat slidingly limiting the support seat, and a pelletizing device fixedly disposed above the movable seat.

[0007] Preferably, a top cover is movably snapped onto the upper end of the mixing cylinder, and a mixing motor is fixedly installed on the upper surface of the top cover. A rotating shaft is installed on the output shaft of the mixing motor, and the rotating shaft extends into the interior of the mixing cylinder. Multiple mixing main rods are provided on both sides of the rotating shaft, and mixing auxiliary rods are fixedly provided at the upper and lower ends of the mixing main rods in a staggered manner.

[0008] Preferably, one end of the mixing main rod is connected to the rotating shaft via a bearing, and the other end of the mixing main rod is fixedly provided with a bevel gear. A bevel gear ring is provided on the inner wall of the mixing cylinder, and the bevel gear and the bevel gear ring are meshed together.

[0009] Preferably, a die head is installed at the front end of the mixing cylinder, and the die head has two through holes at the center point of the two extrusion screws. Rotary rollers are rotatably installed on both sides of the rear end of the pelletizing device. During the extrusion process, one end of the rotary roller extends into the interior of the through hole of the die head, and the rotary roller rotates and engages with the through hole of the die head. Three annularly distributed cutters are provided on the outside of the rotary roller.

[0010] Preferably, a servo motor is fixedly installed at the front end inside the support base, a threaded rod is installed on the output shaft of the servo motor, a sliding block is installed on the outside of the threaded rod, the threaded rod and the sliding block are threadedly engaged, and the two sides of the sliding block are fixed to the movable seat by a connecting plate.

[0011] Preferably, a heating device is installed at the middle position of the outside of the mixing drum, and a cooling device is installed at the front end of the outside of the mixing drum.

[0012] Preferably, the support base is provided with a particle collection chamber at the lower end between the die head and the pelletizing device.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. This utility model features a mixing cylinder into which PE grafted material is pre-poured. By activating the mixing motor, its output shaft drives the rotating shaft to rotate, thereby causing the main mixing rod to stir and mix the PE grafted material inside. Since one end of the main mixing rod is connected to the rotating shaft via a bearing, and a bevel gear is installed at the other end of the main mixing rod, the bevel gear meshes and rubs against the bevel gear ring on the inner wall of the mixing cylinder during the rotation of the main mixing rod. This allows the main mixing rod to revolve around the rotating shaft while maintaining its own rotation, thus driving the external mixing auxiliary rod to rotate. The mixing auxiliary rod vertically disperses and stirs the PE grafted material, working in conjunction with the main mixing rod. This prevents the material from clumping and improves the bonding effect between different materials, resulting in deeper mixing and uniform dispersion of the materials subsequently involved in the mixing process.

[0015] 2. This utility model features a movable pelletizing device. Under normal production conditions, the pelletizing device maintains a certain separation distance and a large gap with the die head. This not only avoids unnecessary friction and wear during production but also effectively prevents accidental material breakage before pelletizing, ensuring the continuity and stability of production. After the PE grafted material is mixed and extruded, the movement of the pelletizing device towards the die head can be precisely controlled by starting the servo motor until the rotating roller of the pelletizing device accurately enters the circular hole at the outer end of the die head. This process not only achieves seamless docking between the pelletizing device and the die head but also ensures the accuracy and consistency of pelletizing. When the motor inside the pelletizing device starts, the rotating roller rotates at high speed, and the cutter efficiently and uniformly pelletizes the extruded PE grafted material at the outer end of the die head, further improving product quality and production efficiency. Attached Figure Description

[0016] Figure 1 This is a perspective view of the present utility model;

[0017] Figure 2 This is a top view of the present invention;

[0018] Figure 3 This is a schematic diagram of the internal structure of the mixing cylinder of this utility model;

[0019] Figure 4 This is a schematic diagram of the movable seat transmission structure of this utility model.

[0020] In the diagram: 1. Base; 2. Support base; 3. Drive mechanism; 4. Injection mechanism; 5. Mixing cylinder; 6. Top cover; 7. Mixing motor; 8. Mixing cylinder; 9. Heating device; 10. Cooling device; 11. Die head; 12. Pelletizing device; 13. Rotary roller; 14. Cutter; 15. Movable seat; 16. Rotating shaft; 17. Main mixing rod; 18. Secondary mixing rod; 19. Bevel gear; 20. Bevel gear ring; 21. Servo motor; 22. Threaded rod; 23. Sliding block. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0022] Please see Figure 1-4This utility model provides an embodiment of a twin-screw compounding extruder for PE grafting production, comprising a base 1, a support seat 2 fixedly disposed on the front side of the upper end face of the base 1, a drive mechanism 3 disposed on the rear side of the upper end face of the base 1, a compounding cylinder 8 mounted above the front end of the drive mechanism 3, an injection mechanism 4 disposed at the rear end of the compounding cylinder 8, a mixing cylinder 5 disposed above the injection mechanism 4, a multi-directional mixing and dispersing mechanism disposed inside the mixing cylinder 5, a movable seat 15 disposed on the front side of the upper end face of the support seat 2, and the movable seat 15 is slidably limited to the support seat 2, and a pelletizing device 12 is fixedly disposed above the movable seat 15.

[0023] Please see Figure 1 , Figure 2 and Figure 3 A top cover 6 is movably attached to the upper end of the mixing cylinder 5. A mixing motor 7 is fixedly installed on the upper end face of the top cover 6. A rotating shaft 16 is installed on the output shaft of the mixing motor 7, and the rotating shaft 16 extends into the interior of the mixing cylinder 5. Multiple mixing main rods 17 are provided on both sides of the rotating shaft 16. Mixing auxiliary rods 18 are fixedly provided at the upper and lower ends of the mixing main rods 17. One end of the mixing main rod 17 is connected to the rotating shaft 16 through a bearing. A bevel gear 19 is fixedly provided at the other end of the mixing main rod 17. A bevel gear ring 20 is provided on the inner wall of the mixing cylinder 5, and the bevel gear 19 is meshed with the bevel gear ring 20.

[0024] PE grafted material is pre-poured into the mixing cylinder 5. By turning on the mixing motor 7, its output shaft drives the rotating shaft 16 to rotate, thereby driving the mixing main rod 17 to stir and mix the PE grafted material inside. Since one end of the mixing main rod 17 is connected to the rotating shaft 16 through a bearing, and a bevel gear 19 is installed at the other end of the mixing main rod 17, the bevel gear 19 meshes and rubs with the bevel gear ring 20 on the inner wall of the mixing cylinder 5 during the rotation of the mixing main rod 17. This allows the mixing main rod 17 to revolve around the center of the rotating shaft 16 while maintaining its own rotation, thereby driving the external mixing auxiliary rod 18 to rotate. The mixing auxiliary rod 18 disperses and stirs the PE grafted material in the vertical direction. In conjunction with the mixing main rod 17, it avoids the raw materials from clumping and improves the bonding effect between different raw materials, thereby allowing the raw materials participating in the subsequent mixing to be deeply mixed and evenly dispersed.

[0025] Please see Figure 1 , Figure 2 and Figure 4The mixing cylinder 8 is equipped with a die head 11 at its front end, and the die head 11 has two through holes at the center points of the two extrusion screws. Rollers 13 are rotatably installed on both sides of the rear end of the pelletizing device 12. During the extrusion process, one end of the roller 13 extends into the inside of the through hole of the die head 11, and the roller 13 rotates with the through hole of the die head 11. Three ring-shaped cutters 14 are provided on the outside of the roller 13. A servo motor 21 is fixedly installed at the front end inside the support base 2. A threaded rod 22 is installed on the output shaft of the servo motor 21. A sliding block 23 is installed on the outside of the threaded rod 22. The threaded rod 22 and the sliding block 23 are connected by threads, and the two sides of the sliding block 23 are fixed to the movable seat 15 by connecting plates.

[0026] Under normal circumstances, the pelletizing device 12 is separated from the die head 11 and maintains a large gap. During the extrusion of PE grafted material, the servo motor 21 is turned on, and its output shaft drives the threaded rod 22 to rotate. Under the friction between the external thread of the threaded rod 22 and the internal thread of the sliding block 23, and with the guiding effect of the inner cavity of the support seat 2 on the sliding block 23, the sliding block 23 drives the movable seat 15 to move through the connecting plate, thereby realizing that the upper pelletizing device 12 moves towards the die head 11 until the rotating roller 13 of the pelletizing device 12 enters the round hole at the outer end of the die head 11. At this time, the motor inside the pelletizing device 12 is turned on, and the output shaft of the motor drives the rotating roller 13 to rotate at high speed, so that the cutter 14 pelletizes the extruded PE grafted material at the outer end of the die head 11.

[0027] Please see Figure 1 and Figure 2 A heating device 9 is installed in the middle of the outside of the mixing cylinder 8, a cooling device 10 is installed at the front end of the outside of the mixing cylinder 8, and a particle collection chamber is provided at the lower end of the support base 2 between the die head 11 and the pelletizing device.

[0028] Raw materials enter the mixing cylinder 5 through the feeding mechanism 4. The mixing motor 7 starts, driving the rotating shaft 16 to rotate. The rotation of the rotating shaft 16 drives the main mixing rod 17 and the auxiliary mixing rod 18 to perform complex movements within the mixing cylinder 5, achieving preliminary mixing and dispersion of the raw materials. After preliminary mixing, the raw materials enter the mixing cylinder 8. The heating device 9 heats the mixing cylinder 8. According to the characteristics of PE grafted material and production process requirements, the target temperature of the heating device is set. A thermal resistor is used to monitor the temperature of the heating device and the material surface in real time to ensure that the temperature is controlled within the set range, so that the raw materials reach a suitable mixing state. Temperature, the twin screw rotates under the drive mechanism 3, and performs strong shearing, stretching and mixing on the raw material. The cooling device 10 has a built-in circulating water system, which transports cooling water to the cooling pipe of the cooling device 10. Utilizing the low temperature and high specific heat capacity of water, it absorbs and removes the heat from the surface of the material to cool and shape the extruded material. The mixed PE grafted material is extruded through the through hole of the die head 11. The cutter 14 on the outside of the rotating roller 13 cuts the extruded PE grafted material to form granules. The cut PE grafted material granules fall into the granule collection chamber, completing the entire production process.

[0029] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A twin-screw compounding extruder for producing PE grafted materials, comprising a base (1), characterized in that: A support seat (2) is fixedly provided on the front side of the upper end face of the base (1). A driving mechanism (3) is provided on the rear side of the upper end face of the base (1). A mixing cylinder (8) is installed above the front end of the driving mechanism (3). A feeding mechanism (4) is installed at the rear end of the mixing cylinder (8). A mixing cylinder (5) is provided above the feeding mechanism (4). A multi-directional mixing and dispersing mechanism is provided inside the mixing cylinder (5). A movable seat (15) is installed on the front side of the upper end face of the support seat (2). The movable seat (15) and the support seat (2) are slidably limited. A pelletizing device (12) is fixedly provided above the movable seat (15).

2. The twin-screw compounding extruder for producing PE grafted materials according to claim 1, characterized in that: The mixing cylinder (5) is movably connected to a top cover (6). A mixing motor (7) is fixedly installed on the upper surface of the top cover (6). A rotating shaft (16) is installed on the output shaft of the mixing motor (7), and the rotating shaft (16) extends into the interior of the mixing cylinder (5). Multiple mixing main rods (17) are provided on both sides of the rotating shaft (16). Mixing auxiliary rods (18) are fixedly provided at the upper and lower ends of the mixing main rods (17) in a staggered manner.

3. A twin-screw compounding extruder for producing PE grafted materials according to claim 2, characterized in that: One end of the mixing main rod (17) is connected to the rotating shaft (16) through a bearing, and the other end of the mixing main rod (17) is fixedly provided with a bevel gear (19). A bevel gear ring (20) is provided on the inner wall of the mixing cylinder (5), and the bevel gear (19) and the bevel gear ring (20) are meshed and connected.

4. A twin-screw compounding extruder for producing PE grafted materials according to claim 1, characterized in that: The mixing cylinder (8) is equipped with a die head (11) at its front end, and the die head (11) has two through holes at the center point of the two extrusion screws. The pelletizing device (12) has rotating rollers (13) on both sides of its rear end. During the extrusion process, one end of the rotating roller (13) extends into the inside of the through hole of the die head (11), and the rotating roller (13) rotates and engages with the through hole of the die head (11). The rotating roller (13) has three ring-shaped cutters (14) on its outside.

5. A twin-screw compounding extruder for producing PE grafted materials according to claim 4, characterized in that: A servo motor (21) is fixedly installed at the front end inside the support base (2). A threaded rod (22) is installed on the output shaft of the servo motor (21). A sliding block (23) is installed on the outside of the threaded rod (22). The threaded rod (22) and the sliding block (23) are connected by threads, and the two sides of the sliding block (23) are fixed to the movable seat (15) by connecting plates.

6. A twin-screw compounding extruder for producing PE grafted materials according to claim 1, characterized in that: A heating device (9) is installed at the middle position outside the mixing drum (8), and a cooling device (10) is installed at the front end outside the mixing drum (8).

7. A twin-screw compounding extruder for producing PE grafted materials according to claim 1, characterized in that: The support base (2) is provided with a particle collection chamber at the lower end between the die head (11) and the pelletizing device.

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