A plastic extruder screw mixing device

Abstract

The utility model discloses a kind of plastic extruder spiral mixing devices, including hopper, the hopper top end opening is equipped with cover plate, the cover plate rotation is connected with stirrer bar, the part side surface of stirrer bar insertion hopper inside is equipped with main spiral stirring blade, the main spiral stirring blade and stirrer bar are connected by connecting rod, the side surface of stirrer bar is equipped with vice spiral stirring blade along main spiral stirring blade inside, the spiral direction of the main spiral stirring blade and vice spiral stirring blade is opposite;The cover plate top end is equipped with stirring motor, and the stirring motor is connected with stirrer bar;The hopper bottom end is equipped with screw conveyor, and the side surface of the hopper is equipped with access hole, and the access hole is equipped with access cover.The utility model can effectively carry out uniform mixing treatment to the plastic particles in the hopper inside by being equipped with stirrer bar in the hopper inside;While hopper bottom is equipped with screw conveyor, and the plastic particles mixed in the bin inside can be conveyed away.

Description

Technical Field

[0001] This utility model relates to the technical field of mixing devices, specifically a spiral mixing device for a plastic extruder. Background Technology

[0002] In the plastics processing industry, plastic extruders are key equipment for heating, melting, mixing, and extruding plastic raw materials. The screw mixer, as a core component of the plastic extruder, directly affects the quality and production efficiency of plastic products. With the rapid development of the plastics industry, market demands for the quality and performance of plastic products are increasing, which places higher standards on the mixing effect of the screw mixer in plastic extruders.

[0003] For example, utility model patent CN219768761U discloses a mixing device for a plastic mixer, including a mixing tank, a spiral mixing blade, and a motor; the mixing tank is conical with the larger diameter end as the top and a feed inlet at the top; the lower outer wall of the mixing tank is fixedly connected to the upper part of the support; the bottom of the mixing tank is connected to the discharge nozzle; the motor is located at the top of the mixing tank and the motor output shaft passes through the mixing tank, and the motor output shaft is rotatably connected to the mixing tank; the top of the spiral mixing blade is fixedly connected to the output shaft of the motor, and the bottom of the spiral mixing blade is rotatably connected to the lower part of the mixing tank; the diameter of the spiral mixing blade gradually decreases from top to bottom, and the spiral mixing blade is fitted with the inner wall of the mixing tank with a clearance fit.

[0004] The mixing device of the plastic mixer provided by the above patent is used separately. It is necessary to use the mixing device to mix the plastic particles evenly before transferring them into the hopper of the plastic extruder. This results in a relatively low efficiency in the process of mixing plastic particles and feeding them into the extruder. At the same time, the mixing device is inconvenient to clean the inside of the mixing tank. The top cover needs to be removed during cleaning, which is very troublesome and not conducive to the flexible use of the entire device. Utility Model Content

[0005] The purpose of this utility model is to provide a spiral mixing device for a plastic extruder, which aims to improve the problems of existing mixers being inconvenient to use with plastic extruders, resulting in low efficiency in mixing and conveying plastic granules, and the mixing device being inconvenient to clean the inside of the mixing tank, which is not conducive to the flexible use of the whole device.

[0006] This utility model is implemented as follows: A spiral mixing device for a plastic extruder includes a hopper. A cover plate is provided at the top opening of the hopper. A stirring rod is rotatably connected to the cover plate. A main spiral stirring blade is provided on the side of the portion of the stirring rod inserted into the hopper. The main spiral stirring blade and the stirring rod are connected by a connecting rod. A secondary spiral stirring blade is provided on the side of the stirring rod along the inner side of the main spiral stirring blade. The spiral directions of the main spiral stirring blade and the secondary spiral stirring blade are opposite. A stirring motor is provided at the top of the cover plate and is connected to the stirring rod. A screw conveyor is provided at the bottom of the hopper, and an inspection port is provided on the side of the hopper. An inspection cover is provided on the inspection port and is detachably connected to the hopper.

[0007] Preferably, the top opening edge of the hopper is provided with a connecting plate, and the edge of the connecting plate is provided with multiple connecting holes; the side of the hopper is provided with a fixing joint above and below the inspection port, and the fixing joint is provided with a clamping knob; the bottom end of the hopper is provided with a discharge pipe, and the discharge pipe is provided with a first flange.

[0008] Preferably, the cover plate has a first bearing in the middle, feed pipes are symmetrically arranged on both sides of the cover plate, a second flange is provided at the top of the feed pipe, and multiple bolt holes are provided on the edge of the cover plate. The cover plate is connected to the hopper by bolts.

[0009] Preferably, the top of the stirring rod protrudes from the cover plate, and a keyway is provided on the top of a portion of the side of the stirring rod protruding from the cover plate.

[0010] Preferably, the output end of the stirring motor is provided with a speed reducer, the output end of the speed reducer is provided with a socket groove, and the inner side of the socket groove is provided with a bar key.

[0011] Preferably, the screw conveyor includes a conveying cylinder, a screw conveyor rod, and a conveying motor; the conveying cylinder has a connecting pipe on its side, a third flange at the top of the connecting pipe, and a second bearing at the end of the conveying cylinder facing the conveying motor; the screw conveyor rod is connected to the second bearing, and a drive slot is provided at the end of the screw conveyor rod connected to the second bearing; the output end of the conveying motor is connected to the drive slot; the end of the conveying motor that is in contact with the conveying cylinder has multiple fixing feet, and fixing holes are provided on the fixing feet; the conveying motor is fixed to the conveying cylinder by bolts.

[0012] Preferably, the outer side of the inspection cover is provided with a longitudinal limiting rod, the limiting rod is locked inside the fixed joint, the clamping knob abuts against the limiting rod, and the outer side of the limiting rod is provided with a handle.

[0013] Preferably, it further includes a collar and a bidirectional screw. The collar is sleeved on the conveying cylinder. A connector is provided on the side of the hopper. A connecting rod is provided on the bottom surface of the connector. A first threaded groove is provided on the bottom surface of the connecting rod. The top end of the bidirectional screw is connected to the first threaded groove, and the bottom end of the bidirectional screw is threadedly connected to the collar.

[0014] Preferably, the collar has a set screw on its side and a mounting rod at its top, with a second threaded groove at the center of the top of the mounting rod.

[0015] Preferably, the bidirectional screw has a rotating handle in the middle, which separates the two threads in different directions on the bidirectional screw.

[0016] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model features a stirring rod inside the hopper, which includes a main spiral stirring blade and a secondary spiral stirring blade. The main spiral stirring blade flips the plastic granules from bottom to top, while the secondary spiral stirring blade flips them from top to bottom, effectively mixing the plastic granules evenly inside the hopper. Simultaneously, a screw conveyor is installed at the bottom of the hopper to transport the mixed plastic granules away. An inspection cover is located on the side of the hopper, allowing for easy access and cleaning of the hopper's interior.

[0017] 2. This utility model features a collar connected to the hopper via a bidirectional screw. The rotation of the bidirectional screw tightens the hopper, ensuring its stability and making it easy to use stably. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the structure of the hopper of this utility model from a front-end oblique downward view; Figure 3 This is a structural schematic diagram of the hopper of this utility model from a rear-end oblique tilting angle; Figure 4 This is a schematic diagram of the structure of the cover plate of this utility model; Figure 5 This is a schematic diagram of the structure of the stirring rod of this utility model; Figure 6 This is a schematic diagram of the structure of the stirring motor of this utility model; Figure 7 This is a schematic diagram of the screw conveyor of this utility model; Figure 8 This is a schematic diagram of the structure of the inspection cover of this utility model; Figure 9 This is a schematic diagram of the structure of the collar of this utility model; Figure 10 This is a schematic diagram of the structure of the bidirectional screw of this utility model.

[0019] In the diagram: 1. Hopper; 11. Connecting plate; 12. Connecting hole; 13. Fixed joint; 14. Tightening knob; 15. Inspection port; 16. Discharge pipe; 17. First flange; 18. Connector; 19. Connecting rod; 191. First threaded groove; 2. Cover plate; 21. First bearing; 22. Feed pipe; 23. Second flange; 24. Bolt hole; 3. Stirring rod; 31. Keyway; 32. Secondary spiral stirring blade; 33. Main spiral stirring blade; 34. Connecting rod; 4. Stirring motor; 41. Reducer; 42. Socket groove; 43. Bar key; 5. Screw conveyor; 51. Conveyor cylinder; 511. Connecting pipe; 512. Third flange; 513. Second bearing; 52. Screw conveyor; 521. Drive slot; 53. Conveyor motor; 531. Fixing foot; 532. Fixing hole; 6. Inspection cover; 61. Limiting rod; 62. Handle; 7. Collar; 71. Set screw; 72. Mounting rod; 73. Second threaded groove; 8. Double-acting screw; 81. Rotating handle. Detailed implementation method: In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0020] The following description, in conjunction with the accompanying drawings and specific embodiments, provides further details: Example 1 like Figure 1 and Figure 5As shown, a spiral mixing device for a plastic extruder includes a hopper 1. A cover plate 2 is provided at the top opening of the hopper 1 to seal the top opening. A stirring rod 3 is rotatably connected to the cover plate 2. A main spiral stirring blade 33 is provided on the side of the portion of the stirring rod 3 inserted into the hopper 1. The main spiral stirring blade 33 and the stirring rod 3 are connected by a connecting rod 34. A secondary spiral stirring blade 32 is provided on the side of the stirring rod 3 along the inner side of the main spiral stirring blade 33. The spiral directions of the main spiral stirring blade 33 and the secondary spiral stirring blade 32 are opposite. This rotation of the stirring rod 3 causes the main spiral stirring blade 33 to tumble the material upwards, while the secondary spiral stirring blade 32 causes the material to tumble downwards, thus achieving effective mixing. A stirring motor 4 is provided at the top of the cover plate 2, connected to the stirring rod 3. The stirring motor 4 facilitates rapid rotation of the stirring rod 3. A screw conveyor 5 is provided at the bottom of the hopper 1 to facilitate the conveying of the mixed plastic granules. Furthermore, the hopper 1 is provided with an inspection port 15 on its side, which allows for quick opening of the side of the hopper 1, facilitating cleaning of the inside of the hopper 1. The inspection port 15 is provided with an inspection cover 6, which is detachably connected to the hopper 1 and allows for sealing of the inspection port 15.

[0021] like Figure 2 As shown, a connecting plate 11 is provided at the edge of the top opening of the hopper 1, and multiple connecting holes 12 are provided on the edge of the connecting plate 11. The connection plate 11 and the connecting holes 12 are designed to facilitate connection with the cover plate 2 via bolts. Fixed joints 13 are provided above and below the inspection port 15 on the side of the hopper 1, and clamping knobs 14 are provided on the fixed joints 13. The fixed joints 13 and clamping knobs 14 facilitate the fixing of the inspection cover 6, making the installation and fixation of the inspection cover 6 convenient and easy to use. A discharge pipe 16 is provided at the bottom of the hopper 1, and a first flange 17 is provided on the discharge pipe 16. The discharge pipe 16 and the first flange 17 facilitate the connection of the hopper 1 to the screw conveyor 5.

[0022] like Figure 4 As shown, a first bearing 21 is provided in the middle of the cover plate 2, which facilitates connection with the stirring rod 3. Feed pipes 22 are symmetrically arranged on both sides of the cover plate 2, and a second flange 23 is provided at the top of the feed pipe 22. The feed pipe 22, in conjunction with the second flange 23, facilitates connection with external feeding pipes, allowing the plastic granules to be mixed to be easily introduced into the hopper 1. Multiple bolt holes 24 are provided along the edge of the cover plate 2, and the cover plate 2 is connected to the hopper 1 by bolts.

[0023] like Figure 5 As shown, the top of the stirring rod 3 protrudes from the cover plate 2, and a keyway 31 is provided on the top of a portion of the side of the stirring rod 3 protruding from the cover plate 2; this structure facilitates the connection between the stirring rod 3 and the stirring motor 4.

[0024] like Figure 6As shown, the output end of the stirring motor 4 is equipped with a reducer 41, the output end of the reducer 41 is equipped with a socket groove 42, and the inner side of the socket groove 42 is equipped with a bar key 43; this structure facilitates the stirring motor 4 to drive the stirring rod 3 to rotate, thereby realizing the mixing of materials.

[0025] like Figure 7 As shown, the screw conveyor 5 includes a conveying cylinder 51, a screw conveyor 52, and a conveying motor 53. A connecting pipe 511 is provided on the side of the conveying cylinder 51, and a third flange 512 is provided at the top of the connecting pipe 511. The connecting pipe 511 and the third flange 512 facilitate the connection of the conveying cylinder 51 to the hopper 1. A second bearing 513 is provided at the end of the conveying cylinder 51 facing the conveying motor 53, facilitating rotation with the screw conveyor 52. The screw conveyor 52 is connected to the second bearing 513, and a drive slot 521 is provided at the end of the screw conveyor 52 connected to the second bearing 513. The output end of the conveying motor 53 is connected to the drive slot 521. This structure facilitates the conveying motor 53 driving the screw conveyor to rotate. Multiple fixing feet 531 are provided at the end of the conveying motor 53 that is in contact with the conveying cylinder 51. Fixing holes 532 are provided on the fixing feet 531. The conveying motor 53 is fixed to the conveying cylinder 51 with bolts, ensuring stable installation and use of the conveying motor 53.

[0026] like Figure 8 As shown, a limiting rod 61 is longitudinally provided on the outer side of the inspection cover 6. The limiting rod 61 is locked inside the fixed joint 13, and the clamping knob 14 abuts against the limiting rod 61. This structure ensures that the inspection cover 6 is stably installed on the side of the hopper 1. A handle 62 is provided on the outer side of the limiting rod 61. The handle 62 is convenient for holding the inspection cover 6 and for easy disassembly and assembly of the inspection cover 6.

[0027] Example 2 like Figure 1 and Figure 5As shown, a spiral mixing device for a plastic extruder includes a hopper 1. A cover plate 2 is provided at the top opening of the hopper 1 to seal the top opening. A stirring rod 3 is rotatably connected to the cover plate 2. A main spiral stirring blade 33 is provided on the side of the portion of the stirring rod 3 inserted into the hopper 1. The main spiral stirring blade 33 and the stirring rod 3 are connected by a connecting rod 34. A secondary spiral stirring blade 32 is provided on the side of the stirring rod 3 along the inner side of the main spiral stirring blade 33. The spiral directions of the main spiral stirring blade 33 and the secondary spiral stirring blade 32 are opposite. This rotation of the stirring rod 3 causes the main spiral stirring blade 33 to tumble the material upwards, while the secondary spiral stirring blade 32 causes the material to tumble downwards, thus achieving effective mixing. A stirring motor 4 is provided at the top of the cover plate 2, connected to the stirring rod 3. The stirring motor 4 facilitates rapid rotation of the stirring rod 3. A screw conveyor 5 is provided at the bottom of the hopper 1 to facilitate the conveying of the mixed plastic granules. Furthermore, the hopper 1 is provided with an inspection port 15 on its side, which allows for quick opening of the side of the hopper 1, facilitating cleaning of the inside of the hopper 1. The inspection port 15 is provided with an inspection cover 6, which is detachably connected to the hopper 1 and allows for sealing of the inspection port 15.

[0028] like Figure 2 As shown, a connecting plate 11 is provided at the edge of the top opening of the hopper 1, and multiple connecting holes 12 are provided on the edge of the connecting plate 11. The connection plate 11 and the connecting holes 12 are designed to facilitate connection with the cover plate 2 via bolts. Fixed joints 13 are provided above and below the inspection port 15 on the side of the hopper 1, and clamping knobs 14 are provided on the fixed joints 13. The fixed joints 13 and clamping knobs 14 facilitate the fixing of the inspection cover 6, making the installation and fixation of the inspection cover 6 convenient and easy to use. A discharge pipe 16 is provided at the bottom of the hopper 1, and a first flange 17 is provided on the discharge pipe 16. The discharge pipe 16 and the first flange 17 facilitate the connection of the hopper 1 to the screw conveyor 5.

[0029] like Figure 4 As shown, a first bearing 21 is provided in the middle of the cover plate 2, which facilitates connection with the stirring rod 3. Feed pipes 22 are symmetrically arranged on both sides of the cover plate 2, and a second flange 23 is provided at the top of the feed pipe 22. The feed pipe 22, in conjunction with the second flange 23, facilitates connection with external feeding pipes, allowing the plastic granules to be mixed to be easily introduced into the hopper 1. Multiple bolt holes 24 are provided along the edge of the cover plate 2, and the cover plate 2 is connected to the hopper 1 by bolts.

[0030] like Figure 5 As shown, the top of the stirring rod 3 protrudes from the cover plate 2, and a keyway 31 is provided on the top of a portion of the side of the stirring rod 3 protruding from the cover plate 2; this structure facilitates the connection between the stirring rod 3 and the stirring motor 4.

[0031] like Figure 6As shown, the output end of the stirring motor 4 is equipped with a reducer 41, the output end of the reducer 41 is equipped with a socket groove 42, and the inner side of the socket groove 42 is equipped with a bar key 43; this structure facilitates the stirring motor 4 to drive the stirring rod 3 to rotate, thereby realizing the mixing of materials.

[0032] like Figure 7 As shown, the screw conveyor 5 includes a conveying cylinder 51, a screw conveyor 52, and a conveying motor 53. A connecting pipe 511 is provided on the side of the conveying cylinder 51, and a third flange 512 is provided at the top of the connecting pipe 511. The connecting pipe 511 and the third flange 512 facilitate the connection of the conveying cylinder 51 to the hopper 1. A second bearing 513 is provided at the end of the conveying cylinder 51 facing the conveying motor 53, facilitating rotation with the screw conveyor 52. The screw conveyor 52 is connected to the second bearing 513, and a drive slot 521 is provided at the end of the screw conveyor 52 connected to the second bearing 513. The output end of the conveying motor 53 is connected to the drive slot 521. This structure facilitates the conveying motor 53 driving the screw conveyor to rotate. Multiple fixing feet 531 are provided at the end of the conveying motor 53 that is in contact with the conveying cylinder 51. Fixing holes 532 are provided on the fixing feet 531. The conveying motor 53 is fixed to the conveying cylinder 51 with bolts, ensuring stable installation and use of the conveying motor 53.

[0033] like Figure 8 As shown, a limiting rod 61 is longitudinally provided on the outer side of the inspection cover 6. The limiting rod 61 is locked inside the fixed joint 13, and the clamping knob 14 abuts against the limiting rod 61. This structure ensures that the inspection cover 6 is stably installed on the side of the hopper 1. A handle 62 is provided on the outer side of the limiting rod 61. The handle 62 is convenient for holding the inspection cover 6 and for easy disassembly and assembly of the inspection cover 6.

[0034] like Figure 1 and Figure 3 As shown, it also includes a collar 7 and a bidirectional screw 8. The collar 7 is sleeved on the conveying cylinder 51. The side of the hopper 1 is provided with a connector 18. The bottom surface of the connector 18 is provided with a connecting rod 19. The bottom surface of the connecting rod 19 is provided with a first threaded groove 191. The top end of the bidirectional screw 8 is connected to the first threaded groove 191, and the bottom end of the bidirectional screw 8 is threadedly connected to the collar 7. This structure facilitates the connection between the hopper 1 and the screw conveyor 5 through the bidirectional screw 8, which facilitates further fixing of the position of the hopper 1 and ensures the stable use of the hopper 1.

[0035] like Figure 9 As shown, the collar 7 has a set screw 71 on its side, which facilitates fixing the collar 7. The collar 7 also has a mounting rod 72 at its top, and a second threaded groove 73 at the middle of the top of the mounting rod 72. The engagement of the mounting rod 72 and the second threaded groove 73 facilitates connection with the bidirectional screw 8.

[0036] like Figure 10As shown, a rotating handle 81 is provided in the middle of the bidirectional screw 8. The rotating handle 81 separates the two threads in different directions on the bidirectional screw 8, and the rotating handle 81 also facilitates the rotation of the bidirectional screw 8.

[0037] Working Principle: During operation, the entire device is installed at the feed inlet of the plastic extruder, connecting the discharge end of the screw conveyor 5 to the feed inlet of the plastic extruder. Plastic granules are fed into the hopper 1 after being connected to the external feeding pipe via the second flange 23 on the feed pipes 22 on both sides of the cover plate 2. The stirring motor 4 is started, and its output end drives the stirring rod 3 to rotate via the reducer 41. Because the main spiral stirring blades 33 and the auxiliary spiral stirring blades 32 on the stirring rod 3 have opposite spiral directions, the main spiral stirring blades 33 cause the material to tumble upwards, while the auxiliary spiral stirring blades 32 cause the material to tumble downwards, thus achieving effective mixing of the material within the hopper 1. The mixed plastic granules enter the screw conveyor 5 through the discharge pipe 16 at the bottom of the hopper 1. The conveying motor 53 drives the spiral conveying rod 52 to rotate within the conveying cylinder 51, discharging the material from the conveying cylinder 51 to the feed inlet of the plastic extruder. In addition, the side inspection port 15 of the hopper 1 makes it easy to open and clean the inside, and the collar 7, double screw 8 and other structures can fix the position of the hopper 1 to ensure stable operation of the equipment.

[0038] In summary, compared with the prior art, this application provides a stirring rod 3 inside the hopper 1. The stirring rod 3 has a main spiral stirring blade 33 and a secondary spiral stirring blade 32. The main spiral stirring blade 33 can flip the plastic particles from bottom to top, and the secondary spiral stirring blade 32 can flip the plastic from top to bottom. This can effectively and uniformly mix the plastic particles inside the hopper 1. At the same time, a screw conveyor 5 is provided at the bottom of the hopper 1 to transport the mixed plastic particles out of the hopper. An inspection cover 6 is provided on the side of the hopper 1, which can open the side of the hopper 1 to facilitate the quick cleaning of the inside of the hopper 1 by the staff.

[0039] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A screw mixing device for a plastic extruder, comprising a hopper (1), characterized in that, The top opening of the hopper (1) is provided with a cover plate (2), and the cover plate (2) is rotatably connected to a stirring rod (3). The side of the stirring rod (3) inserted into the hopper (1) is provided with a main spiral stirring blade (33). The main spiral stirring blade (33) and the stirring rod (3) are connected by a connecting rod (34). The side of the stirring rod (3) is provided with a secondary spiral stirring blade (32) along the inner side of the main spiral stirring blade (33). The spiral directions of the main spiral stirring blade (33) and the secondary spiral stirring blade (32) are opposite. The top of the cover plate (2) is provided with a stirring motor (4), and the stirring motor (4) is connected to the stirring rod (3). The bottom of the hopper (1) is provided with a screw conveyor (5), and the side of the hopper (1) is provided with a maintenance port (15). The maintenance port (15) is provided with a maintenance cover (6), and the maintenance cover (6) is detachably connected to the hopper (1).

2. The screw mixing device for a plastic extruder according to claim 1, characterized in that, The top opening edge of the hopper (1) is provided with a connecting plate (11), and the edge of the connecting plate (11) is provided with multiple connecting holes (12); the side of the hopper (1) is provided with a fixed joint (13) above and below the inspection port (15), and the fixed joint (13) is provided with a clamping knob (14); the bottom end of the hopper (1) is provided with a discharge pipe (16), and the discharge pipe (16) is provided with a first flange (17).

3. The screw mixing device for a plastic extruder according to claim 1, characterized in that, The cover plate (2) is provided with a first bearing (21) in the middle, and feed pipes (22) are provided symmetrically on both sides of the cover plate (2). The top of the feed pipe (22) is provided with a second flange (23). The edge of the cover plate (2) is provided with multiple bolt holes (24). The cover plate (2) is connected to the hopper (1) by bolts.

4. The screw mixing device for a plastic extruder according to claim 1, characterized in that, The top of the stirring rod (3) protrudes from the cover plate (2), and a keyway (31) is provided on the top of a portion of the side of the stirring rod (3) protruding from the cover plate (2).

5. A screw mixing device for a plastic extruder according to claim 4, characterized in that, The output end of the stirring motor (4) is provided with a speed reducer (41), the output end of the speed reducer (41) is provided with a socket groove (42), and the inner side of the socket groove (42) is provided with a bar key (43).

6. The screw mixing device for a plastic extruder according to claim 1, characterized in that, The screw conveyor (5) includes a conveying cylinder (51), a screw conveyor (52), and a conveying motor (53). The conveying cylinder (51) has a connecting pipe (511) on its side and a third flange (512) at the top of the connecting pipe (511). The end of the conveying cylinder (51) facing the conveying motor (53) is provided with a second bearing (513). The screw conveyor (52) is connected to the second bearing (513), and the end of the screw conveyor (52) connected to the second bearing (513) is provided with a drive slot (521). The output end of the conveying motor (53) is connected to the drive slot (521). The end of the conveying motor (53) that is in contact with the conveying cylinder (51) is provided with multiple fixing feet (531). The fixing feet (531) are provided with fixing holes (532). The conveying motor (53) is fixed to the conveying cylinder (51) by bolts.

7. A screw mixing device for a plastic extruder according to claim 2, characterized in that, The inspection cover (6) has a longitudinally arranged limiting rod (61) on its outer side. The limiting rod (61) is locked inside the fixed joint (13). The pressing knob (14) abuts against the limiting rod (61). The limiting rod (61) has a handle (62) on its outer side.

8. A screw mixing device for a plastic extruder according to any one of claims 1-7, characterized in that, It also includes a collar (7) and a bidirectional screw (8). The collar (7) is sleeved on the conveying cylinder (51). The hopper (1) has a connector (18) on its side. The bottom surface of the connector (18) has a connecting rod (19). The bottom surface of the connecting rod (19) has a first threaded groove (191). The top end of the bidirectional screw (8) is connected to the first threaded groove (191). The bottom end of the bidirectional screw (8) is threadedly connected to the collar (7).

9. A screw mixing device for a plastic extruder according to claim 8, characterized in that, The collar (7) has a set screw (71) on its side and an installation rod (72) at its top. The installation rod (72) has a second threaded groove (73) at the middle of its top.

10. A screw mixing device for a plastic extruder according to claim 8, characterized in that, The bidirectional screw (8) is provided with a rotating handle (81) in the middle, which separates the two threads in different directions on the bidirectional screw (8).

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