An extrusion mechanism and a twin screw extruder having the same

Abstract

The application provides an extrusion mechanism and a double-screw extruder with the mechanism, which comprises a frame, the end of the frame is provided with an extrusion hole, two extrusion rotating motors are fixedly arranged outside the end of the frame away from the extrusion hole, the output ends of the extrusion rotating motors are fixedly provided with screws, the screws are located in the interior of the frame, the bottom of the frame is connected with an inert gas inflating device, and the top of the frame is connected with a vacuumizing device; a positioning block is fixedly arranged on the inner wall of the feeding pipe, the top of the positioning block is connected with a first spring, the top of the first spring is connected with the bottom of a filter screen plate, and a plurality of filter screen holes are formed in the filter screen plate. The application provides the extrusion mechanism and the double-screw extruder with the mechanism, which can extract the gas and volatile matters in the material, avoid the oxidation of the material, and filter the impurities in the material, so that the quality of the finished product is higher.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of material extrusion machinery, in particular to an extrusion mechanism and a double-screw extruder with the same. BACKGROUND

[0002] Most plastic injection molding equipment adopts the principle of extrusion. After the plastic is added to the barrel of the extruder from the hopper, it is forced to move towards the head direction by the screw thread as the screw rotates. The gradually reduced volume between the threads causes the advancing material to be subjected to a lot of pressure, and at the same time it is heated by the heat source of the barrel. In addition, when the plastic is subjected to compression, shearing, stirring and other forces during movement, friction between the plastic and the barrel and screw, as well as friction between the plastic molecules, all generate a large amount of heat. Therefore, the temperature of the plastic in the barrel continues to rise, and its physical state gradually changes from a glass state to a high-elastic state, and finally becomes a viscous flow state, achieving complete plasticization. Since the screw is always rotating stably, the plasticized material is extruded from the die of the head at a constant pressure and quantity, becoming a plastic product with a certain shape, which is cooled and shaped to complete the extrusion molding work.

[0003] In the prior art, a precision double-screw extruder with publication number "CN113211761A" includes a positioning base plate, a transmission mechanism, a feeding mechanism, a preheating mechanism and an extrusion pipe are fixedly installed on the upper end of the positioning base plate, the feeding mechanism and the preheating mechanism are in communication, the preheating mechanism and the extrusion pipe are in communication, a vacuum generator is fixedly installed on the preheating mechanism, the preheating mechanism and the vacuum generator are in communication, the output shaft of the transmission mechanism is fixedly connected with a first screw and a second screw respectively, the first screw and the second screw are the same in length, the first screw and the second screw rotate towards each other, one end of the first screw and the second screw is sequentially penetrated through the feeding mechanism and the preheating mechanism and located in the extrusion pipe, and a discharge port is formed in the end of the extrusion pipe away from the preheating mechanism. The precision double-screw extruder has good heating effect through preheating, avoids uneven distribution of extrudates caused by the first-melted material and the later-melted material, and reduces the generation of bubbles through the vacuum generator.

[0004] However, during use, the above-mentioned double-screw extruder still has the following obvious defects: 1. During the extrusion process, the material is easily oxidized or degraded under high temperature and high pressure, causing the material to discolor, and the gas and volatile matter in the material cannot be timely discharged, affecting the appearance quality of the product; 2. The above-mentioned device directly processes and extrudes the material, and if the material contains large particle impurities, the product quality will be greatly affected, so improvement is needed. SUMMARY

[0005] The present application aims to provide an extrusion mechanism and a double-screw extruder with the same to solve the problems raised in the background.

[0006] To achieve the above object, the present application provides the following technical scheme:

[0007] An extrusion mechanism comprises a frame, an extrusion hole is formed at the end of the frame, two extrusion rotary motors are fixedly arranged outside the end of the frame away from the extrusion hole, the output ends of the extrusion rotary motors are fixedly provided with screw rods, the screw rods are located inside the frame, an inert gas inflating device is communicated with the bottom of the frame, and a vacuumizing device is communicated with the top of the frame.

[0008] A feeding pipe is communicated with the top of the frame, a feeding hopper is fixedly arranged at the top of the feeding pipe, a stirring device is arranged in the feeding pipe, a positioning block is fixedly arranged on the inner wall of the feeding pipe, a first spring is connected to the top of the positioning block, the bottom of a filter screen plate is connected to the top of the first spring, a plurality of filter screen holes are formed in the filter screen plate, the diameter of the filter screen plate is smaller than the inner diameter of the feeding pipe, an elastic sealing gasket is arranged between the filter screen plate and the inner wall of the feeding pipe, a bearing seat is inlaid in the side surface of the positioning block, a hinged rod is hingedly arranged in the bearing seat, a plurality of blades and a hollow plate are fixedly arranged on the hinged rod, a movable plate is movably arranged in the inner cavity of the hollow plate, a second spring is arranged between the movable plate and the bottom of the inner cavity of the hollow plate, a bottom rod is fixedly arranged on the side of the movable plate away from the second spring, a hitting ball is fixedly arranged at the end of the bottom rod, a baffle is fixedly arranged on the inner wall of the feeding pipe and located below the filter screen plate, a hollow elastic plate is arranged between the baffle and the bottom of the filter screen plate, a third spring is arranged in the hollow elastic plate, an air inlet pipe is arranged on the bottom plate of the baffle, a third isolation screen and a first one-way valve are arranged in the air inlet pipe, a blowing cover is fixedly arranged on the side of the air inlet pipe close to the blades, and an isolation space is formed by the inner wall of the feeding pipe, the elastic sealing gasket, the filter screen plate, the hollow elastic plate and the baffle, an exhaust pipe is arranged on the side wall of the feeding pipe at the position, and a second one-way valve is arranged in the exhaust pipe.

[0009] Preferably, the inert gas inflating device comprises an air inlet channel arranged on the bottom wall of the frame, a plurality of air outlet pipes are communicated and arranged on the side of the air inlet channel close to the inside of the frame, an air inlet pipe is communicated and arranged on the side of the air inlet channel away from the air outlet pipes, and an air inlet pump is arranged on the air inlet pipe.

[0010] Preferably, the first isolation screen is fixedly arranged in the air outlet pipe.

[0011] Preferably, the vacuumizing device comprises a fixing block, an exhaust channel is arranged in the fixing block, a plurality of exhaust branch pipes are communicated and arranged on the side of the exhaust channel close to the inside of the frame, an exhaust pipe is communicated and arranged on the side of the exhaust channel away from the exhaust branch pipes, and a vacuum pump is arranged on the exhaust pipe.

[0012] Preferably, a second isolation net is fixedly arranged in the exhaust branch pipe.

[0013] Preferably, the stirring device comprises a stirring rotating motor fixedly arranged outside the feeding pipe, an output end of the stirring rotating motor is fixedly provided with a stirring shaft, and the stirring shaft is located in the feeding pipe, and a plurality of stirring rods are fixedly arranged on the stirring shaft.

[0014] Preferably, a base is fixedly arranged at the bottom of the rack.

[0015] A double-screw extruder comprising the above-mentioned extruding mechanism.

[0016] Compared with the prior art, the present application has the following beneficial effects:

[0017] 1. The vacuum device is arranged at the top of the rack, and the gas and volatile matter in the material are extracted by the negative pressure effect, so as to reduce the possibility of oxidation and degradation and avoid discoloration of the material due to oxidation or decomposition.

[0018] 2. The inert gas blowing device is arranged at the bottom of the rack, and the active gas contained in the material can be volatilized after the inert gas blowing device is opened, so as to avoid chemical reaction between the material and other additives and active gas and ensure the stability of the material.

[0019] 3. The filter screen plate is arranged in the feeding pipe, so that the large-particle impurities in the material can be filtered and removed in advance, and the product quality is ensured. When the filter screen holes in the filter screen plate are blocked, the inert gas blowing device can be opened, the vacuum device can be closed, and the extrusion hole can be blocked. At this time, the airflow blows the blade, so that the impact ball intermittently hits the filter screen plate, and the blockage in the filter screen hole is shaken out, so that the discharging is more smooth, and manual cleaning is not required frequently.

[0020] The present application provides an extruding mechanism and a double-screw extruder with the mechanism, which can extract the gas and volatile matter in the material, avoid oxidation of the material, and filter impurities in the material, so that the quality of the finished product is higher. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a front view of the main structure of the present application;

[0022] Figure 2 It is an enlarged view of A in the present application Figure 1

[0023] Figure 3 It is an enlarged view of B in the present application Figure 1

[0024] Figure 4 ​​The figure is a schematic view of the relevant structure on the articulated rod of the present application.

[0025] In the figure: 1 frame, 101 extrusion hole, 2 extrusion rotary motor, 3 screw rod, 401 air inlet channel, 402 air outlet pipe, 403 first isolation net, 5 air inlet pipe, 6 air inlet pump, 7 fixed block, 801 exhaust channel, 802 exhaust branch pipe, 803 second isolation net, 804 exhaust pipe, 9 vacuum pump, 10 feeding pipe, 11 feeding hopper, 12 stirring rotary motor, 13 stirring shaft, 14 stirring rod, 15 positioning block, 16 first spring, 17 filter screen plate, 171 filter screen hole, 18 elastic sealing gasket, 19 bearing seat, 20 articulated rod, 21 blade, 22 hollow plate, 23 movable plate, 24 second spring, 25 bottom rod, 26 impact ball, 27 baffle, 28 hollow elastic plate, 29 third spring, 30 air inlet pipe, 31 third isolation net, 32 first one-way valve, 33 air blowing cover, 34 exhaust pipe, 35 second one-way valve, 36 base. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0027] Please refer to Figures 1 to 4 The present application provides a technical solution:

[0028] Embodiment one

[0029] An extrusion mechanism, comprising a frame 1, the end of the frame 1 is provided with an extrusion hole 101, the material is extruded from the extrusion hole 101, the outer side of the end of the frame 1 away from the extrusion hole 101 is fixedly provided with two extrusion rotary motors 2, the output ends of the extrusion rotary motors 2 are fixedly provided with screw rods 3, and the screw rods 3 are located in the interior of the frame 1, in use, the two extrusion rotary motors 2 are started to make the two screw rods 3 rotate, thereby pushing the material forward and extruding, the bottom of the frame 1 is communicatively provided with an inert gas inflating device, after the inert gas inflating device is started, the volatilization of active gas contained in the material can be accelerated, thereby avoiding chemical reaction between the material and other additives and active gas, ensuring the stability of the material, the top of the frame 1 is communicatively provided with a vacuumizing device, after the vacuumizing device is started, the gas and volatilization in the material are extracted by the negative pressure effect, reducing the possibility of oxidation and degradation, avoiding discoloration of the material due to oxidation or decomposition.

[0030] The top of the frame 1 is connected to a feed pipe 10, and a feed hopper 11 is fixedly provided on the top of the feed pipe 10. The material can be poured directly into the feed hopper 11, and then enter the interior of the frame 1 along the feed pipe 10. A stirring device is provided in the feed pipe 10, and a positioning block 15 is fixedly provided on the inner wall of the feed pipe 10. The top of the positioning block 15 is connected to a first spring 16. The first spring 16 has good elasticity. The top of the first spring 16 is connected to the bottom of the filter plate 17. The filter plate 17 is provided with a plurality of filter holes 171. The material can pass through the filter holes 171, and large particles of solid impurities will be blocked. The diameter of the filter plate 17 is smaller than the inner diameter of the feed pipe 10, and an elastic connection is provided between the filter plate 17 and the inner wall of the feed pipe 10. The sealing gasket 18 is elastic and can be stretched or compressed when subjected to force, so that the filter plate 17 and the inner wall of the feed pipe 10 are blocked, and there is no gap, which prevents the material from entering here and causing jamming. A bearing seat 19 is embedded in the side of the positioning block 15, and a hinged rod 20 is hingedly provided in the bearing seat 19. The setting of the bearing seat 19 allows the hinged rod 20 to rotate smoothly. A plurality of blades 21 and a hollow plate 22 are fixedly provided on the hinged rod 20. When the air flow blows towards the blade 21, the blade 21 will drive the hinged rod 20 to rotate. A movable plate 23 is movably provided in the inner cavity of the hollow plate 22. The movable plate 23 can move along the inner cavity of the hollow plate 22. The inner cavity of the hollow plate 22 is a convex shape, and the diameter of the movable plate 23 is larger than the bottom rod 2. 5 in diameter to prevent the movable plate 23 from escaping from the inner cavity of the hollow plate 22. A second spring 24 is connected between the movable plate 23 and the bottom of the inner cavity of the hollow plate 22. A bottom rod 25 is fixedly provided on the side of the movable plate 23 away from the second spring 24. An impact ball 26 is fixedly provided on the end of the bottom rod 25. When the hinged rod 20 rotates, the impact ball 26 intermittently hits the filter plate 17, thereby shaking out the blockage in the filter hole 171, making the discharge smoother and eliminating the need for frequent manual cleaning. A baffle 27 is fixedly provided on the inner wall of the feed pipe 10, and the baffle 27 is located below the filter plate 17. A hollow elastic plate 28 is connected between the baffle 27 and the bottom of the filter plate 17. A third spring 29 is provided in the hollow elastic plate 28. The hollow elastic plate 28 and The third spring 29 has good elasticity and can adapt to the up and down vibration of the filter plate 17. An air intake pipe 30 is provided on the bottom plate of the baffle 27. A third isolation net 31 and a first one-way valve 32 are provided in the air intake pipe 30. The setting of the first one-way valve 32 allows gas to enter the air intake pipe 30 only from the outside and cannot flow back. A blowing hood 33 is fixedly provided on the side of the air intake pipe 30 close to the blade 21. The inner wall of the feed pipe 10, the elastic sealing gasket 18, the filter plate 17, the hollow elastic plate 28 and the baffle 27 form an isolation space, and an exhaust pipe 34 is provided on the side wall of the feed pipe 10 at this position. A second one-way valve 35 is provided in the exhaust pipe 34. The setting of the second one-way valve 35 allows the gas in the above-mentioned isolation space to be discharged outward only through the exhaust pipe 34.The gas cannot also flow back, whereby the gas is blown out of the blowing hood 33, blown towards the vane 21, causes the articulated lever 20 to rotate, and the ball 26 to hit the screen plate 17 intermittently, causing the screen plate 17 to vibrate, and finally, the gas is discharged through the exhaust pipe 34.

[0031] Embodiment two

[0032] The extrusion mechanism comprises a rack 1, the end of the rack 1 is provided with an extrusion hole 101, material is extruded from the extrusion hole 101, two extrusion rotary motors 2 are fixedly arranged outside the end of the rack 1 away from the extrusion hole 101, the output ends of the two extrusion rotary motors 2 are both fixedly provided with a screw rod 3, and the screw rod 3 is located inside the rack 1, in use, the two extrusion rotary motors 2 are started, so that the two screw rods 3 rotate, and then the material is pushed forward and extruded, the bottom of the rack 1 is communicatively provided with an inert gas blowing device, after the inert gas blowing device is started, the volatilization of active gas contained in the material can be accelerated, so that chemical reaction between the material and other additives and the active gas is avoided, and the stability of the material is ensured, specifically, the inert gas blowing device comprises an air inlet channel 401 arranged on the bottom wall of the rack 1, a plurality of air outlet pipes 402 are communicatively arranged on the side of the air inlet channel 401 close to the inside of the rack 1, a first isolation net 403 is fixedly arranged in the air outlet pipe 402, the first isolation net 403 can avoid the material from entering the air outlet pipe 402, an air inlet pipe 5 is communicatively arranged on the side of the air inlet channel 401 away from the air outlet pipe 402, and an air inlet pump 6 is arranged on the air inlet pipe 5, in use, the air inlet pipe 5 is connected to an external inert gas generating device, and the air inlet pump 6 is started, so that the inert gas is blown out from the plurality of air outlet pipes 402 after passing through the air inlet pipe 5 and the air inlet channel 401, a vacuumizing device is communicatively arranged on the top of the rack 1, after the vacuumizing device is started, the gas and volatile matters in the material are extracted by the negative pressure effect, the possibility of oxidation and degradation is reduced, and the material is prevented from discoloring due to oxidation or decomposition, specifically, the vacuumizing device comprises a fixed block 7, an exhaust channel 801 is arranged in the fixed block 7, a plurality of exhaust branch pipes 802 are communicatively arranged on the side of the exhaust channel 801 close to the inside of the rack 1, a second isolation net 803 is fixedly arranged in the exhaust branch pipe 802, an exhaust pipe 804 is communicatively arranged on the side of the exhaust channel 801 away from the exhaust branch pipe 802, and a vacuum pump 9 is arranged on the exhaust pipe 804, in use, the vacuum pump 9 is started, and the gas in the inside of the rack 1 is sequentially discharged outwards through the exhaust branch pipe 802, the exhaust channel 801 and the exhaust pipe 804.

[0033] The top of the frame 1 is connected to a feed pipe 10, and a feed hopper 11 is fixedly provided on the top of the feed pipe 10. The material can be poured directly into the feed hopper 11, and then enter the interior of the frame 1 along the feed pipe 10. A stirring device is provided in the feed pipe 10, and a positioning block 15 is fixedly provided on the inner wall of the feed pipe 10. The top of the positioning block 15 is connected to a first spring 16. The first spring 16 has good elasticity. The top of the first spring 16 is connected to the bottom of the filter plate 17. The filter plate 17 is provided with a plurality of filter holes 171. The material can pass through the filter holes 171, and large particles of solid impurities will be blocked. The diameter of the filter plate 17 is smaller than the inner diameter of the feed pipe 10, and an elastic connection is provided between the filter plate 17 and the inner wall of the feed pipe 10. The sealing gasket 18 is elastic and can be stretched or compressed when subjected to force, so that the filter plate 17 and the inner wall of the feed pipe 10 are blocked, and there is no gap, which prevents the material from entering here and causing jamming. A bearing seat 19 is embedded in the side of the positioning block 15, and a hinged rod 20 is hingedly provided in the bearing seat 19. The setting of the bearing seat 19 allows the hinged rod 20 to rotate smoothly. A plurality of blades 21 and a hollow plate 22 are fixedly provided on the hinged rod 20. When the air flow blows towards the blade 21, the blade 21 will drive the hinged rod 20 to rotate. A movable plate 23 is movably provided in the inner cavity of the hollow plate 22. The movable plate 23 can move along the inner cavity of the hollow plate 22. The inner cavity of the hollow plate 22 is a convex shape, and the diameter of the movable plate 23 is larger than the bottom rod 2. 5 in diameter to prevent the movable plate 23 from escaping from the inner cavity of the hollow plate 22. A second spring 24 is connected between the movable plate 23 and the bottom of the inner cavity of the hollow plate 22. A bottom rod 25 is fixedly provided on the side of the movable plate 23 away from the second spring 24. An impact ball 26 is fixedly provided on the end of the bottom rod 25. When the hinged rod 20 rotates, the impact ball 26 intermittently hits the filter plate 17, thereby shaking out the blockage in the filter hole 171, making the discharge smoother and eliminating the need for frequent manual cleaning. A baffle 27 is fixedly provided on the inner wall of the feed pipe 10, and the baffle 27 is located below the filter plate 17. A hollow elastic plate 28 is connected between the baffle 27 and the bottom of the filter plate 17. A third spring 29 is provided in the hollow elastic plate 28. The hollow elastic plate 28 and The third spring 29 has good elasticity and can adapt to the up and down vibration of the filter plate 17. An air intake pipe 30 is provided on the bottom plate of the baffle 27. A third isolation net 31 and a first one-way valve 32 are provided in the air intake pipe 30. The setting of the first one-way valve 32 allows gas to enter the air intake pipe 30 only from the outside and cannot flow back. A blowing hood 33 is fixedly provided on the side of the air intake pipe 30 close to the blade 21. The inner wall of the feed pipe 10, the elastic sealing gasket 18, the filter plate 17, the hollow elastic plate 28 and the baffle 27 form an isolation space, and an exhaust pipe 34 is provided on the side wall of the feed pipe 10 at this position. A second one-way valve 35 is provided in the exhaust pipe 34. The setting of the second one-way valve 35 allows the gas in the above-mentioned isolation space to be discharged outward only through the exhaust pipe 34.There is no reverse flow either. Therefore, the gas is blown out from the blowing hood 33 and blown towards the blades 21, causing the hinged rod 20 to rotate. The impact ball 26 intermittently hits the filter plate 17, causing the filter plate 17 to vibrate. Finally, the gas is discharged through the exhaust pipe 34.

[0034] A base 36 is symmetrically fixedly provided at the bottom of the frame 1. The provision of the base 36 makes the frame 1 more stable and has the effect of reducing vibration and noise.

[0035] Example 3:

[0036] Based on the above-mentioned embodiment 1 or embodiment 2, this embodiment further discloses and defines the specific structure of the stirring device. Specifically: the stirring device includes a stirring rotary motor 12, and the stirring rotary motor 12 is fixedly arranged on the outside of the feeding pipe 10. The output end of the stirring rotary motor 12 is fixedly provided with a stirring shaft 13, and the stirring shaft 13 is located in the feeding pipe 10. A plurality of stirring rods 14 are fixedly provided on the stirring shaft 13. While feeding, the stirring rotary motor 12 can be turned on, and the stirring rotary motor 12 drives the plurality of stirring rods 14 to rotate through the stirring shaft 13, thereby stirring the material, so that the material is mixed more evenly and the quality of the finished product is more stable.

[0037] A twin-screw extruder comprises the above-mentioned extrusion mechanism.

[0038] Working principle:

[0039] When in use, pour the material directly into the feed hopper 11. The material will enter the interior of the frame 1 along the feed pipe 10. The two extrusion rotary motors 2 are started, causing the two screws 3 to rotate, thereby pushing the material forward and extruding it. At the same time:

[0040] If it is necessary to extract the gas and volatiles in the material to reduce the possibility of oxidation and degradation and avoid discoloration of the material due to oxidation or decomposition, the vacuum device can be turned on, the vacuum pump 9 can be turned on, and the gas inside the frame 1 will be discharged outward through the exhaust branch pipe 802, the exhaust channel 801, and the exhaust pipe 804 in sequence;

[0041] If it is necessary to accelerate the volatilization of the active gas contained in the material, thereby avoiding chemical reactions between the material and other additives and the active gas, and ensuring the stability of the material properties, the inert gas blowing device can be turned on. When in use, the air inlet pipe 5 is connected to the external inert gas generator, and the air inlet pump 6 is turned on, so that the inert gas passes through the air inlet pipe 5 and the air inlet channel 401, and is finally blown out from the multiple air outlet pipes 402. At this time, the vacuum device can also be turned on to accelerate the extraction of the gas.

[0042] If the filter screen holes 171 of the filter screen plate 17 are blocked by materials, at this time, the inert gas blowing device can be opened, the vacuum pumping device is closed and the extrusion hole 101 is blocked, at this time, the airflow is blown out from the blowing cover 33, the blowing blade 21 is blown, the articulated rod 20 is rotated, the hollow plate 22 is rotated, the ball 26 is intermittently hit to the filter screen plate 17, the filter screen plate 17 is vibrated up and down, the first spring 16, the second spring 24 and the third spring 29 are compressed or stretched, and then the blockage in the filter screen holes 171 is shaken out, so that the material is discharged more smoothly, the manual cleaning is not needed frequently, the cleanliness of the material is improved, and the product quality is effectively improved.

[0043] While the embodiments of the application have been illustrated and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the spirit and scope of the application, which is defined by the appended claims and their equivalents.

Claims

1. An extrusion mechanism, comprising a frame, characterized in that: An extrusion hole begins to be provided at the end of the frame, and two extrusion rotating motors are fixedly provided on the outer side of one end of the frame away from the extrusion hole, and screws are fixedly provided at the output ends of the extrusion rotating motors, and the screws are located inside the frame, the bottom of the frame is connected to an inert gas blowing device, and the top of the frame is connected to a vacuum device; the top of the frame is connected to a feeding pipe, a feeding hopper is fixedly provided on the top of the feeding pipe, a stirring device is provided in the feeding pipe, a positioning block is fixedly provided on the inner wall of the feeding pipe, the top of the positioning block is connected to a first spring, the top of the first spring is connected to the bottom of the filter plate, a plurality of filter holes are provided on the filter plate, the diameter of the filter plate is smaller than the inner diameter of the feeding pipe, and an elastic sealing gasket is connected between the filter plate and the inner wall of the feeding pipe, a bearing seat is embedded in the side of the positioning block, and a hinge is provided in the bearing seat The cam is fixedly provided with a plurality of blades and hollow plates on the hinged rod, and a movable plate is movably provided in the inner cavity of the hollow plate, and a second spring is connected between the movable plate and the bottom of the inner cavity of the hollow plate, and a bottom rod is fixedly provided on the side of the movable plate away from the second spring, and an impact ball is fixedly provided on the end of the bottom rod, and a baffle is fixedly provided on the inner wall of the feed pipe, and the baffle is located below the filter plate, and a hollow elastic plate is connected between the baffle and the bottom of the filter plate, a third spring is provided in the hollow elastic plate, an air intake pipe is provided on the bottom plate of the baffle, a third isolation net and a first one-way valve are provided on the air intake pipe, and a blowing hood is fixedly provided on the side of the intake pipe close to the blades, the inner wall of the feed pipe, the elastic sealing gasket, the filter plate, the hollow elastic plate and the baffle form an isolation space, and an exhaust pipe is provided on the side wall of the feed pipe at the isolation space, and the exhaust pipe is provided 2. An extrusion mechanism according to claim 1, characterized in that: The inert gas blowing device includes an air inlet channel arranged on the bottom wall of the frame, a side of the air inlet channel close to the inside of the frame is connected to a plurality of air outlet pipes, a side of the air inlet channel away from the air outlet pipe is connected to an air inlet pipe, and an air intake pump is provided on the air inlet pipe.

3. An extrusion mechanism according to claim 2, characterized in that: A first isolation net is fixedly arranged in the air outlet pipe.

4. The extrusion mechanism according to claim 1, characterized in that: The vacuum pumping device includes a fixed block, in which an exhaust channel is provided. A side of the exhaust channel close to the interior of the frame is connected to a plurality of exhaust branch pipes, and a side of the exhaust channel away from the exhaust branch pipe is connected to an exhaust pipe, and a vacuum pump is provided on the exhaust pipe.

5. An extrusion mechanism according to claim 4, characterized in that: A second isolation net is fixedly arranged in the exhaust branch pipe.

6. The extrusion mechanism according to claim 1, characterized in that: The stirring device includes a stirring rotary motor, which is fixedly arranged on the outside of the feeding pipe. A stirring shaft is fixedly arranged on the output end of the stirring rotary motor, and the stirring shaft is located in the feeding pipe. A plurality of stirring rods are fixedly arranged on the stirring shaft.

7. The extrusion mechanism according to claim 1, characterized in that: A base is symmetrically fixedly arranged on the bottom of the frame.

8. A twin-screw extruder, characterized in that: The invention comprises the extrusion mechanism described in any one of claims 1 to 7.

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