Double-screw extruder for producing environment-friendly filling particles

Abstract

The invention relates to the field of production and processing of filling particles, in particular to a double-screw extruder for producing environment-friendly filling particles. Which comprises an extruder body, the extruder body comprises a feeding chamber and a discharging mechanism, and is characterized in that a mixing mechanism is connected with the feeding chamber and comprises a lifting plate and a mixing tank, the mixing tank is fixedly connected with the inner wall of the feeding chamber, the lifting plate is slidably connected with the inner wall of the mixing tank, an upper cavity of the mixing tank is arranged above the lifting plate, and a lower cavity of the mixing tank is arranged below the lifting plate; the variable stirring assembly is connected with the mixing tank and comprises a plurality of stirring mechanisms, and the stirring mechanisms are arranged in an equal-angle array mode in the circumferential direction of the lower cavity; each stirring mechanism comprises an exhaust funnel, a plurality of main stirring rods and a plurality of auxiliary stirring rods, the exhaust funnel is rotationally connected with the lower end of the mixing tank, the auxiliary stirring rods are arranged above the exhaust funnel in an equal-angle array mode in the circumferential direction, and the main stirring rods are arranged above the auxiliary stirring rods in an equal-angle array mode in the circumferential direction.

Description

Technical Field

[0001] The invention relates to the field of production and processing of filling particles, and in particular to a twin-screw extruder for producing environmentally friendly filling particles. Background Art

[0002] The twin-screw extruder is developed on the basis of the single-screw extruder. Due to its good feeding performance, mixing and plasticizing performance, exhaust performance and extrusion stability, it has been widely used in the molding processing of extruded products. Compared with the single-screw extruder, it has better use effect and wider application range.

[0003] When processing environmentally friendly filling particles, it is necessary to first mix TPE particles and white oil. At this time, since TPE is usually an elastomer, white oil mainly plays a plasticizing role, and a relatively gentle stirring method is required at this stage. Then add PP resin. PP resin is a thermoplastic resin. Its particle morphology and physical properties are different from those of the TPE-white oil system. At this time, it is necessary to appropriately increase the stirring speed and stirring intensity. In this process, because PP resin does not have good fluidity like white oil, a stronger external force is required to break its agglomeration state and make it evenly distributed. Finally, calcium powder is added, and calcium powder has a large density and is easy to settle. In order to prevent the precipitation of calcium powder, the stirring mechanism needs to adopt a multi-angle stirring method to further process it. In this regard, compared with traditional material extrusion, the stirring mechanism in this device needs to have multiple stirring modes, and the traditional stirring mechanism cannot meet the above stirring process.

[0004] In addition, the existing twin-screw extruder only extracts volatiles and gases through negative pressure. It is difficult for tiny bubbles deep in the material to evaporate and flow to the upper end, which will cause the produced material to contain tiny bubbles, thus affecting the uniformity and quality of the entire material mixing. For this reason, we need to improve the structure of the existing twin-screw extruder. Summary of the invention

[0005] Based on this, it is necessary to provide a twin-screw extruder for producing environmentally friendly filling particles in response to the existing technical problems.

[0006] In order to solve the problems of the prior art, the technical solution adopted by the present invention is: A twin-screw extruder for producing environmentally friendly filling particles comprises an extruder body, wherein the extruder body comprises a feed chamber and a discharge mechanism, and further comprises: The mixing mechanism is connected to the feeding chamber and includes a lifting plate and a mixing tank. The mixing tank is fixedly connected to the inner wall of the feeding chamber, the lifting plate is slidably connected to the inner wall of the mixing tank, the upper part of the lifting plate is the upper cavity of the mixing tank, and the lower part of the lifting plate is the lower cavity of the mixing tank; A variable stirring assembly is connected to the mixing tank and includes a plurality of stirring mechanisms, wherein the plurality of stirring mechanisms are arranged in an array with equal angles along the circumference of the lower cavity; Each stirring mechanism includes an exhaust pipe, a plurality of main stirring rods and a plurality of auxiliary stirring rods. The exhaust pipe is rotatably connected to the lower end of the mixing tank and sealed at both ends. The plurality of auxiliary stirring rods are arranged in an array with equal angles in the circumferential direction above the exhaust pipe, and the plurality of main stirring rods are arranged in an array with equal angles in the circumferential direction above the plurality of auxiliary stirring rods.

[0007] Furthermore, the mixing mechanism also includes a bellows and two electric push rods. The bellows is coaxially arranged with the mixing tank. The upper end of the bellows is connected to the feed port of the mixing tank, and the lower end is connected to the middle part of the lifting plate. The two electric push rods are symmetrically arranged at the upper end of the lifting plate and fixedly connected to the mixing tank. The output end of the electric push rod is fixedly connected to the lifting plate.

[0008] Furthermore, the mixing mechanism also includes a first electric valve, a second electric valve and a guide tube. The first electric valve is coaxially fixed to the lifting plate, the second electric valve is coaxially fixed to the lower end of the mixing tank, the lower end of the bellows is connected to the first electric valve, the upper end of the guide tube is connected to the second electric valve, and the lower end is connected to the feed port of the discharge mechanism.

[0009] Furthermore, the variable stirring assembly also includes a motor, a first bevel gear, a second bevel gear and a first gear. The motor is fixedly connected to the side wall of the feed chamber. The first bevel gear is rotatably connected to the inner wall of the feed chamber through the bevel gear rack and is coaxially fixed to the output end of the motor. The second bevel gear is rotatably connected to the bevel gear rack and meshes with the first bevel gear. The first gear is rotatably connected to the bevel gear rack and coaxially fixed to the second bevel gear.

[0010] Furthermore, the variable stirring assembly also includes a first gear ring, a second gear ring and a plurality of second gears. The first gear ring is coaxially rotatably connected to the lower end of the mixing tank and meshes with the first gear. The second gear ring is coaxially fixedly connected to the lower end of the first gear ring. The plurality of second gears are arranged in an array at equal angles along the circumferential direction of the lower end of the mixing tank. The plurality of second gears are respectively coaxially fixedly connected to a plurality of exhaust pipes.

[0011] Furthermore, the stirring mechanism also includes a bottom cylinder, a return spring, a sub-rod and a protective cover. The bottom cylinder is coaxially fixedly connected to the upper end of the exhaust pipe, the return spring is coaxially fixedly connected to the bottom cylinder, the sub-rod is coaxially keyed to the bottom cylinder and the lower end is abutted against the upper end of the return spring, the protective cover is coaxially sleeved on the outside of the bottom cylinder and is slidably connected to the bottom cylinder, and the protective cover is fixedly connected to the upper end of the sub-rod.

[0012] Furthermore, the stirring mechanism also includes a top plate, which is fixedly connected to the upper end of the protective cover and abuts against the lower end of the lifting plate. One end of a plurality of main stirring rods is hinged to the upper end of the protective cover through a rod seat.

[0013] Furthermore, one end of each main stirring rod away from the axis of the exhaust pipe is fixedly connected to two weight plates.

[0014] Furthermore, the stirring mechanism also includes a plurality of slides, a plurality of main connecting rods, a plurality of traction racks and a plurality of traction gears. The slide is slidably connected to the outer wall of the protective cover, one end of the slide is hinged to one end of the main connecting rod, the other end of the main connecting rod is hinged to the main stirring rod, and the two sides of the slide are respectively fixedly connected with traction racks. The auxiliary stirring rod is hinged to the outer wall of the protective cover through the rod seat, and the two sides of the rod seat are respectively coaxially fixedly connected with traction gears. The traction gear is coaxially fixed to the auxiliary stirring rod and meshes with the traction rack.

[0015] Furthermore, the stirring mechanism also includes a main rod, a piston, a plurality of first one-way valves and a plurality of second one-way valves. The main rod is coaxially arranged with the auxiliary rod and is arranged at the lower end of the auxiliary rod. The piston is coaxially fixedly connected with the lower end of the main rod. The piston is dynamically sealed with the inner wall of the exhaust pipe. The plurality of first one-way valves are arranged in an array with equal angles along the circumferential direction of the upper end of the exhaust pipe, and the plurality of second one-way valves are arranged in an array with equal angles along the circumferential direction of the middle part of the exhaust pipe.

[0016] Compared with the prior art, the present invention has the following beneficial effects: Firstly, the device squeezes the material in the lower chamber through the lifting plate, thereby exhausting the material during the mixing process, so as to avoid the bubbles deep in the material from affecting the quality of the mixed material due to the inability to volatilize and flow; Second: the device achieves stirring of materials by setting a number of stirring mechanisms that can be adaptively changed with the lifting plate, ensuring that during the stirring process of the materials, the main stirring rod and the auxiliary stirring rod on the stirring mechanism can be deflected differently with the output power of the motor, thereby adapting to the mixing process of different materials; Third: This device uses several main stirring rods and several auxiliary stirring rods to stir and mix the materials in the lower chamber, ensuring that different materials can be subjected to external forces of different angles and speeds when entering the lower chamber, thereby achieving uniform mixing of the materials in the lower chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the three-dimensional structure of an embodiment; Figure 2 is a schematic diagram of a three-dimensional structure decomposition of an embodiment; Figure 3 is a half-section view of the three-dimensional structure of the mixing mechanism and the variable stirring assembly in the embodiment; Figure 4 yes Figure 3 A magnified view of the structure at center; Figure 5 yes Figure 3 A magnified view of the structure at B in the middle; Figure 6 yes Figure 3 A magnified view of the structure at C in the middle; Figure 7 yes Figure 3 A magnified view of the structure at D in the middle; Figure 8 is a front view of the three-dimensional structure of the variable stirring assembly in the embodiment; Fig. 9 It is a front half-section view of the mixing mechanism and the variable stirring assembly in the embodiment.

[0018] The numbers in the figure are: 1. Extruder body; 2. Feed chamber; 3. Discharge mechanism; 4. Mixing mechanism; 5. Mixing tank; 6. Lifting plate; 7. Electric push rod; 8. Corrugated cover; 9. Upper chamber; 10. Lower chamber; 11. First electric valve; 12. Second electric valve; 13. Guide tube; 14. Variable stirring assembly; 15. Motor; 16. First bevel gear; 17. Second bevel gear; 18. First gear; 19. First gear ring; 20. Second gear ring; 21. Second gear; 22. Stirring mechanism; 23. Exhaust pipe; 24. First one-way valve; 25. Second one-way valve; 26. Main rod; 27. Piston; 28. Bottom cylinder; 29. ​​Return spring; 30. Auxiliary rod; 31. Protective cover; 32. Top plate; 33. Main stirring rod; 34. Weight plate; 35. Main connecting rod; 36. Sliding seat; 37. Traction rack; 38. Traction gear; 39. Auxiliary stirring rod. DETAILED DESCRIPTION

[0019] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0020] refer to Figures 1 to 9 A twin-screw extruder for producing environmentally friendly filling particles comprises an extruder body 1, wherein the extruder body 1 comprises a feed chamber 2 and a discharge mechanism 3, and further comprises: The mixing mechanism 4 is connected to the feeding chamber 2, and includes a lifting plate 6 and a mixing tank 5. The mixing tank 5 is fixedly connected to the inner wall of the feeding chamber 2, and the lifting plate 6 is slidably connected to the inner wall of the mixing tank 5. The upper part of the lifting plate 6 is an upper cavity 9 of the mixing tank 5, and the lower part is a lower cavity 10 of the mixing tank 5. The variable stirring assembly 14 is connected to the mixing tank 5 and includes a plurality of stirring mechanisms 22, and the plurality of stirring mechanisms 22 are arranged in an array with equal angles along the circumference direction of the lower chamber 10; Each stirring mechanism 22 includes an exhaust pipe 23, a plurality of main stirring rods 33 and a plurality of auxiliary stirring rods 39. The exhaust pipe 23 is rotatably connected to the lower end of the mixing tank 5 (refer to Fig. 9 ) and sealed at both ends, a plurality of auxiliary stirring rods 39 are arranged in an array with equal angles along the circumferential direction above the exhaust pipe 23 (refer to Figure 8), a plurality of main stirring rods 33 are arranged in an array with equal angles along the circumferential direction above a plurality of auxiliary stirring rods 39.

[0021] When the device is in operation, after the materials enter the mixing tank 5 in sequence, the variable stirring assembly 14 is started first to drive the plurality of stirring mechanisms 22 to stir and mix the materials. During this process, the stirring mechanism 22 will change the inclination angles of the main stirring rod 33 and the auxiliary stirring rod 39 according to the different rotation speeds, so as to fully mix the materials at different stages. After the mixing is completed, the lifting plate 6 in the mixing tank 5 will descend. During the descent, the pressure in the lower chamber 10 increases, and the materials in the lower chamber 10 will be squeezed. During the squeezing process, the materials will squeeze out the bubbles from the plurality of exhaust pipes 23, so as to improve the quality of the materials.

[0022] In order to supplement the specific structure of the mixing mechanism 4, the following features are also specifically provided: The mixing mechanism 4 also includes a bellows 8 and two electric push rods 7. The bellows 8 is coaxially arranged with the mixing tank 5. The upper end of the bellows 8 is connected to the feed port of the mixing tank 5 (refer to Figure 3 ), the lower end of which is connected to the middle of the lifting plate 6, two electric push rods 7 are symmetrically arranged at the upper end of the lifting plate 6 and are fixedly connected to the mixing tank 5, and the output end of the electric push rod 7 is fixedly connected to the lifting plate 6. When the pressure inside the mixing tank 5 needs to be changed to eliminate the bubbles in the material, the electric push rod 7 is started and drives the lifting plate 6 to move downward. During the movement of the lifting plate 6, the volume of the lower chamber 10 in the mixing tank 5 will be compressed. In this process, the corrugated cover 8 will limit the movement of the lifting plate 6, so as to adaptively adjust the movement of the lifting plate 6.

[0023] In order to facilitate better inflow and outflow of materials in the mixing tank 5, the following features are also specifically provided: The mixing mechanism 4 further includes a first electric valve 11, a second electric valve 12 and a guide tube 13. The first electric valve 11 is coaxially fixedly connected to the lifting plate 6 (refer to Fig. 9 ), the second electric valve 12 is coaxially fixedly connected to the lower end of the mixing tank 5, the lower end of the bellows 8 is connected to the first electric valve 11, the upper end of the guide tube 13 is connected to the second electric valve 12, and the lower end is connected to the feed port of the discharge mechanism 3. When the material flows into the mixing tank 5, the first electric valve 11 is opened and the second electric valve 12 is closed; during the material mixing and pressurization process, the first electric valve 11 and the second electric valve 12 are both closed. When the material flows out of the mixing tank 5 through the guide tube 13 and flows into the discharge mechanism 3, the first electric valve 11 is closed and the second electric valve 12 is opened.

[0024] In order to supplement the structure of the variable stirring assembly 14, the following features are also specifically provided: The variable stirring assembly 14 further includes a motor 15, a first bevel gear 16, a second bevel gear 17 and a first gear 18. The motor 15 is fixedly connected to the side wall of the feed chamber 2 (refer to Figure 7 ), the first bevel gear 16 is rotatably connected to the inner wall of the feed chamber 2 through the bevel gear frame and is coaxially fixedly connected to the output end of the motor 15, the second bevel gear 17 is rotatably connected to the bevel gear frame and meshes with the first bevel gear 16, and the first gear 18 is rotatably connected to the bevel gear frame and coaxially fixedly connected to the second bevel gear 17. When the motor 15 is started, the motor 15 drives the second bevel gear 17 to rotate through the first bevel gear 16, and the second bevel gear 17 rotates and drives the first gear 18 fixedly connected thereto to rotate.

[0025] In order to drive the exhaust pipe 23 to rotate, the following features are also specifically provided: The variable stirring assembly 14 further includes a first gear ring 19, a second gear ring 20 and a plurality of second gears 21. The first gear ring 19 is coaxially connected to the lower end of the mixing tank 5 and meshes with the first gear 18 (see FIG. Figure 7 ), the second gear ring 20 is coaxially fixedly connected to the lower end of the first gear ring 19, and a plurality of second gears 21 are arranged in an array at equal angles along the circumferential direction of the lower end of the mixing tank 5, and the plurality of second gears 21 are coaxially fixedly connected to a plurality of exhaust pipes 23. After the first gear 18 rotates, the first gear 18 drives the second gear ring 20 to rotate through the first gear ring 19, and the second gear ring 20 drives the plurality of exhaust pipes 23 to rotate through the plurality of second gears 21. When the exhaust pipes 23 rotate, they drive the plurality of main stirring rods 33 and auxiliary stirring rods 39 above them to stir the materials in the mixing tank 5.

[0026] In order to supplement the specific structure of the stirring mechanism 22, the following features are also specifically provided: The stirring mechanism 22 further includes a bottom cylinder 28, a return spring 29, a secondary rod 30 and a protective cover 31. The bottom cylinder 28 is coaxially fixedly connected to the upper end of the exhaust cylinder 23 (refer to Figure 5 ), the reset spring 29 is coaxially fixedly connected to the bottom cylinder 28, the auxiliary rod 30 is coaxially keyed to the bottom cylinder 28 and the lower end thereof abuts against the upper end of the reset spring 29, the protective cover 31 is coaxially sleeved on the outside of the bottom cylinder 28 and slidably connected to the bottom cylinder 28, and the protective cover 31 is fixedly connected to the upper end of the auxiliary rod 30. When the material is stirred, the rotation of the exhaust cylinder 23 will drive the auxiliary rod 30 to rotate through the bottom cylinder 28. As can be seen from the foregoing, since the lifting plate 6 will move, the reset spring 29 ensures that the bottom cylinder 28 can be displaced in the vertical direction as the lifting plate 6 moves. The specific displacement process will be explained later.

[0027] In order to realize that the bottom cylinder 28 drives the main stirring rod 33 to move, the following features are also specifically provided: The stirring mechanism 22 further includes a top plate 32, which is fixedly connected to the upper end of the protective cover 31 and abuts against the lower end of the lifting plate 6. One end of a plurality of main stirring rods 33 is hinged to the upper end of the protective cover 31 through a rod seat (refer to Figure 6 ). When the lifting plate 6 moves, the lifting plate 6 will drive the bottom cylinder 28 to move through the top plate 32, and the bottom cylinder 28 will drive the main stirring rod 33 to move when moving, ensuring that when the material is pressurized, the main stirring rod 33 can also stir the material to accelerate the elimination of bubbles.

[0028] In order to achieve that the main stirring rod 33 can change its angle under the action of centrifugal force when the exhaust cylinder 23 rotates, the following features are specifically provided: One end of each main stirring rod 33 away from the axis of the exhaust cylinder 23 is fixedly connected to two weight plates 34. When the exhaust cylinder 23 rotates, the centrifugal force generated by the rotation of the exhaust cylinder 23 will cause each main stirring rod 33 to deflect with its hinge point as the center of the circle, thereby achieving that the deflection angle of the main stirring rod 33 changes with the different rotation speeds of the exhaust cylinder 23.

[0029] In order to achieve the deflection of the auxiliary stirring rod 39 along with the main stirring rod 33 during the stirring process, the following features are also specifically provided: The stirring mechanism 22 further includes a plurality of slides 36, a plurality of main connecting rods 35, a plurality of traction racks 37 and a plurality of traction gears 38. The slides 36 are slidably connected to the outer wall of the protective cover 31. One end of the slides 36 is hinged to one end of the main connecting rod 35. The other end of the main connecting rod 35 is hinged to the main stirring rod 33. The two sides of the slides 36 are respectively fixedly connected with traction racks 37. The auxiliary stirring rod 39 is hinged to the outer wall of the protective cover 31 through the rod seat. The two sides of the rod seat are respectively coaxially fixedly connected with traction gears 38. The traction gear 38 is coaxially fixedly connected to the auxiliary stirring rod 39 and meshes with the traction rack 37. When the bottom drum 28 rotates, the centrifugal force will cause the angle of the main stirring rod 33 to change. At this time, the main stirring rod 33 will drive the slide 36 to move through the main connecting rod 35. When the slide 36 moves, it will drive the traction gear 38 to rotate through the traction rack 37. After the traction gear 38 rotates, it will drive the angle of the corresponding auxiliary stirring rod 39 to change, so as to improve the stirring degree of the material.

[0030] In order to release the gas entering the exhaust pipe 23, the following features are also specifically provided: The stirring mechanism 22 further includes a main rod 26, a piston 27, a plurality of first one-way valves 24 and a plurality of second one-way valves 25. The main rod 26 is coaxially arranged with the auxiliary rod 30 and is arranged at the lower end of the auxiliary rod 30 (refer to Fig. 9 ), the piston 27 is coaxially fixedly connected to the lower end of the main rod 26, the piston 27 is dynamically sealed to the inner wall of the exhaust cylinder 23, and a plurality of first one-way valves 24 are arranged in an array at equal angles along the circumferential direction of the upper end of the exhaust cylinder 23 (refer to Figure 5), a plurality of second one-way valves 25 are arranged in an array at equal angles along the circumferential direction of the middle part of the exhaust cylinder 23. When the lifting plate 6 pushes the protective cover 31 downward through the top plate 32, the protective cover 31 will drive the main rod 26 to move through the auxiliary rod 30, and the main rod 26 will move through the piston 27 after moving. At this time, the first one-way valve 24 will ensure that the bubbles in the material enter the exhaust cylinder 23, and the bubbles entering the exhaust cylinder 23 will flow out of the exhaust cylinder 23 from the plurality of second one-way valves 25 when the piston 27 moves upward and resets, thereby achieving the removal of bubbles in the material.

[0031] The working principle of the device is that when the device is in operation, the materials for the production of environmentally friendly filling particles are mixed in batches in the mixing tank 5, and the specific order is: first add TPE particles and white oil for mixing, then add PP resin, and finally add calcium powder. Each material needs to be stirred after being added, and bubbles will be generated during the stirring process, and the ratio of the material and the gas in the mixing tank 5 (the gas includes the inherent gas in the lower chamber 10 and the bubbles generated during the material stirring process) is close to 1:1.

[0032] Specifically, when the material flows into the mixing tank 5, the first electric valve 11 is opened and the second electric valve 12 is closed; during the material mixing and pressurizing process, the first electric valve 11 and the second electric valve 12 are both closed. When the material flows out of the mixing tank 5 through the guide pipe 13 and flows into the discharging mechanism 3, the first electric valve 11 is closed and the second electric valve 12 is opened.

[0033] When the material needs to be stirred, the motor 15 starts and drives the exhaust pipes 23 to rotate. When the exhaust pipes 23 rotate, the inclination angles of the main stirring rod 33 and the auxiliary stirring rod 39 will be changed according to the different rotation speeds, so as to fully mix the materials at different stages. During the mixing process, the centrifugal force will cause the angle of the main stirring rod 33 to change. At this time, the main stirring rod 33 will drive the slide 36 to move through the main connecting rod 35. When the slide 36 moves, it will drive the traction gear 38 to rotate through the traction rack 37. After the traction gear 38 rotates, it will drive the angle of the corresponding auxiliary stirring rod 39 to change, so as to improve the stirring degree of the material and ensure that the material can be mixed evenly in the mixing tank 5.

[0034] When the volume of the lower chamber 10 is compressed, the main stirring rod 33 and the auxiliary stirring rod 39 will continue to stir the material to improve the uniformity of the materials in different layers. At the same time, the lifting plate 6 in the mixing tank 5 will descend. During the descent, the pressure in the lower chamber 10 increases, and the material in the lower chamber 10 will be squeezed. The material will discharge the bubbles from the several exhaust pipes 23 during the squeezing process. At this time, the first one-way valve 24 will ensure that the bubbles in the material enter the exhaust pipe 23 (the first one-way valve 24 and the second one-way valve 25 are both gas one-way valves, which only allow gas to pass through but not liquid or solid particles. The gas one-way valve is a mature existing technology and will not be repeated here). The bubbles entering the exhaust pipe 23 will flow out of the exhaust pipe 23 from the several second one-way valves 25 when the piston 27 moves upward and resets, thereby realizing the removal of bubbles in the material, so as to improve the quality of the material.

[0035] Finally, the processed material can flow out of the mixing tank 5 through the opened second electric valve 12 as the lifting plate 6 continues to descend (in this process, the rotation of the main stirring rod 33 and the auxiliary stirring rod 39 will accelerate the flow of the material so that the material can be quickly discharged from the mixing tank 5), and the discharging mechanism 3 will extrude the mixed material.

[0036] The above embodiments only express one or several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the attached claims.

Claims

1. A twin-screw extruder for producing environmentally friendly filling particles, comprising an extruder body (1), the extruder body (1) comprising a feed chamber (2) and a discharge mechanism (3), characterized in that: Also includes: The mixing mechanism (4) is connected to the feed chamber (2), and comprises a lifting plate (6) and a mixing tank (5); the mixing tank (5) is fixedly connected to the inner wall of the feed chamber (2); the lifting plate (6) is slidably connected to the inner wall of the mixing tank (5); an upper chamber (9) of the mixing tank (5) is located above the lifting plate (6), and a lower chamber (10) of the mixing tank (5) is located below the lifting plate (6); A variable stirring assembly (14) is connected to the mixing tank (5) and comprises a plurality of stirring mechanisms (22), wherein the plurality of stirring mechanisms (22) are arranged in an array at equal angles along the circumference of the lower chamber (10); Each stirring mechanism (22) comprises an exhaust pipe (23), a plurality of main stirring rods (33) and a plurality of auxiliary stirring rods (39); the exhaust pipe (23) is rotatably connected to the lower end of the mixing tank (5) and sealed at both ends; the plurality of auxiliary stirring rods (39) are arranged in an array at equal angles in a circumferential direction above the exhaust pipe (23); and the plurality of main stirring rods (33) are arranged in an array at equal angles in a circumferential direction above the plurality of auxiliary stirring rods (39).

2. A twin-screw extruder for producing environmentally friendly filling particles according to claim 1, characterized in that: The mixing mechanism (4) further comprises a bellows (8) and two electric push rods (7). The bellows (8) is coaxially arranged with the mixing tank (5). The upper end of the bellows (8) is connected to the feed port of the mixing tank (5), and the lower end is connected to the middle of the lifting plate (6). The two electric push rods (7) are symmetrically arranged at the upper end of the lifting plate (6) and are fixedly connected to the mixing tank (5). The output end of the electric push rod (7) is fixedly connected to the lifting plate (6).

3. The twin-screw extruder for producing environmentally friendly filling particles according to claim 1, characterized in that: The mixing mechanism (4) further comprises a first electric valve (11), a second electric valve (12) and a guide tube (13); the first electric valve (11) is coaxially fixedly connected to the lifting plate (6); the second electric valve (12) is coaxially fixedly connected to the lower end of the mixing tank (5); the lower end of the bellows (8) is connected to the first electric valve (11); the upper end of the guide tube (13) is connected to the second electric valve (12); and the lower end is connected to the feed port of the discharge mechanism (3).

4. The twin-screw extruder for producing environmentally friendly filling particles according to claim 1, characterized in that: The variable stirring assembly (14) further comprises a motor (15), a first bevel gear (16), a second bevel gear (17) and a first gear (18); the motor (15) is fixedly connected to the side wall of the feed chamber (2); the first bevel gear (16) is rotatably connected to the inner wall of the feed chamber (2) via a bevel gear frame and is coaxially fixedly connected to the output end of the motor (15); the second bevel gear (17) is rotatably connected to the bevel gear frame and meshes with the first bevel gear (16); and the first gear (18) is rotatably connected to the bevel gear frame and coaxially fixedly connected to the second bevel gear (17).

5. A twin-screw extruder for producing environmentally friendly filling particles according to claim 4, characterized in that: The variable stirring assembly (14) further comprises a first gear ring (19), a second gear ring (20) and a plurality of second gears (21); the first gear ring (19) is coaxially rotatably connected to the lower end of the mixing tank (5) and meshes with the first gear (18); the second gear ring (20) is coaxially fixedly connected to the lower end of the first gear ring (19); the plurality of second gears (21) are arranged in an array at equal angles along the circumferential direction of the lower end of the mixing tank (5); and the plurality of second gears (21) are coaxially fixedly connected to a plurality of exhaust pipes (23), respectively.

6. The twin-screw extruder for producing environmentally friendly filling particles according to claim 1, characterized in that: The stirring mechanism (22) further comprises a bottom cylinder (28), a return spring (29), a secondary rod (30) and a protective cover (31); the bottom cylinder (28) is coaxially fixedly connected to the upper end of the exhaust cylinder (23); the return spring (29) is coaxially fixedly connected to the bottom cylinder (28); the secondary rod (30) is coaxially keyed to the bottom cylinder (28) and its lower end abuts against the upper end of the return spring (29); the protective cover (31) is coaxially sleeved on the outside of the bottom cylinder (28) and is slidably connected to the bottom cylinder (28); and the protective cover (31) is coaxially fixedly connected to the upper end of the secondary rod (30).

7. A twin-screw extruder for producing environmentally friendly filling particles according to claim 6, characterized in that: The stirring mechanism (22) further comprises a top plate (32), the top plate (32) being fixedly connected to the upper end of the protective cover (31) and abutting against the lower end of the lifting plate (6), and one end of a plurality of main stirring rods (33) being hinged to the upper end of the protective cover (31) via a rod seat.

8. The twin-screw extruder for producing environmentally friendly filling particles according to claim 1, characterized in that: One end of each main stirring rod (33) away from the axis of the exhaust pipe (23) is fixedly connected to two weight plates (34).

9. The twin-screw extruder for producing environmentally friendly filling particles according to claim 6, characterized in that: The stirring mechanism (22) further comprises a plurality of slide seats (36), a plurality of main connecting rods (35), a plurality of traction racks (37) and a plurality of traction gears (38); the slide seat (36) is slidably connected to the outer wall of the protective cover (31); one end of the slide seat (36) is hinged to one end of the main connecting rod (35); the other end of the main connecting rod (35) is hinged to the main stirring rod (33); the two sides of the slide seat (36) are respectively fixedly connected with traction racks (37); the auxiliary stirring rod (39) is hinged to the outer wall of the protective cover (31) through the rod seat; the two sides of the rod seat are respectively coaxially fixedly connected with traction gears (38); the traction gear (38) is coaxially fixedly connected to the auxiliary stirring rod (39) and meshes with the traction racks (37).

10. A twin-screw extruder for producing environmentally friendly filling particles according to claim 6, characterized in that: The stirring mechanism (22) further comprises a main rod (26), a piston (27), a plurality of first one-way valves (24) and a plurality of second one-way valves (25); the main rod (26) is coaxially arranged with the auxiliary rod (30) and arranged at the lower end of the auxiliary rod (30); the piston (27) is coaxially fixedly connected with the lower end of the main rod (26); the piston (27) is dynamically sealedly connected with the inner wall of the exhaust cylinder (23); the plurality of first one-way valves (24) are arranged in an array at equal angles along the circumferential direction of the upper end of the exhaust cylinder (23); and the plurality of second one-way valves (25) are arranged in an array at equal angles along the circumferential direction of the middle part of the exhaust cylinder (23).

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