Devolatilization extruder for fluoroplastic processing

Abstract

The invention discloses a devolatilization extruder for fluoroplastic processing, and belongs to the technical field of fluoroplastic production, the devolatilization extruder comprises an extrusion chamber and a forming die cavity for PVDF bar forming, a feeding hopper is arranged above the feeding end of the extrusion chamber, and a driving motor is arranged at the feeding end of the extrusion chamber. Through the arrangement of the high-pressure air pump and the gas accelerating cavity, a high-speed airflow ring can be generated by utilizing the Bernoulli effect, cooling water mist is actively adsorbed and dispersed to the surfaces of the bars, water flow impact deformation is avoided, the water mist is uniformly distributed in the concentric-square-shaped cooling cover, synchronous and uniform cooling of the multiple bars is achieved, local thermal stress is eliminated, and the non-contact type gas mist cooling technology is achieved; meanwhile, through the arrangement of a detection air ring and an arc detection assembly, the detection air ring can be used for driving a detection arc plate to make contact with the surface of the bar in a sliding mode, tiny deformation or defects are recognized in real time by sensing the pressure change of a telescopic rod, a flexible rubber ring protects the surface of the bar, detection damage is avoided, the fault response time is shortened through an instant alarm mechanism, and the rejection rate is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of fluoroplastic production, in particular to a devolatilization extruder for fluoroplastic processing. Background Art

[0002] Fluoroplastic refers to plastics made of fluororesin. PVDF rods are made by extruding PVDF resin at high temperature. They are a type of fluoroplastic and are mainly used in the fields of electronics, new energy, petrochemicals, and semiconductor industries.

[0003] Even though PVDF has a very low thermal conductivity, it can still withstand temperatures not exceeding 300 degrees Celsius, which is why it is so popular with consumers. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems in the prior art of poor water cooling effect when extruding multiple PVDF rods simultaneously and difficulty in observing the slight deformation of the rods after extrusion, and to propose a devolatilization extruder for fluoroplastic processing.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A devolatilization extruder for fluoroplastic processing, comprising an extrusion chamber and a forming die for forming PVDF rods, a feed hopper being provided above the feed end of the extrusion chamber, a drive motor being provided at the feed end of the extrusion chamber, the output end of the drive motor being connected to two spiral extrusion blades via a gear assembly, a cooling chamber being fixedly connected to the rear end of the forming die, and a zigzag cooling hood being connected to the inner wall of the cooling chamber for diffusing cooling water mist; Two gas acceleration chambers are provided on one side of the cooling chamber, and the gas acceleration chambers are composed of two upper and lower right-angle chambers. The top of the gas acceleration chamber is connected to a high-pressure air pump through a sealing plate. The inner walls of the right-angle chamber located above and the right-angle chamber located below the gas acceleration chamber are both connected to detection air rings through right-angle fixed rods. The inner walls of the detection air rings are connected to multiple arc measurement components for detecting the surface smoothness of the PVDF rod.

[0006] Preferably, the gear assembly consists of a driving gear, a main gear and a sub-gear, which are engaged with each other in sequence. The output end of the driving motor is fixedly connected to the end of the driving gear through a driving shaft, and the two outer side walls of the extrusion chamber are fixedly connected to a planar base through multiple supports.

[0007] Preferably, the ends of the main gear and the sub-gear are fixedly connected to the inner side wall of the spiral extrusion blade through a rotating shaft, the side wall of the spiral extrusion blade is rotatably connected to the inner side wall of the extrusion chamber, the top of the planar base is fixedly connected to the bottom end of the cooling chamber through a drain seat, and multiple drainage holes are provided on both side walls of the drain seat.

[0008] Preferably, the left and right side walls and the upper side wall of the cooling chamber are fixedly connected with a fog machine for generating cooling water mist, and the front end of the cooling chamber is fixedly connected to the end of the forming cavity.

[0009] Preferably, a docking plate is fixedly connected to the rear end of the cooling chamber, and a plurality of docking holes corresponding to the positions of the extrusion ports on the molding cavity are opened on the docking plate, and the inner diameter of the docking hole is slightly larger than the diameter of the PVDF rod.

[0010] Preferably, the side wall of the docking plate at the docking hole is connected to a pressure bucket through a plurality of shaping rings, and the rough end of the pressure bucket is fixedly connected to the lower end of the gas acceleration chamber.

[0011] Preferably, the top of the gas acceleration chamber is fixedly connected to the bottom end of the sealing plate, and the high-pressure air pump is communicated with the right-angle chamber above and the right-angle chamber below the gas acceleration chamber through multiple branch pipes. The right-angle chamber above and the right-angle chamber below the gas acceleration chamber are respectively provided with one rod through hole and two rod through holes, and the inner side walls of the multiple rod through holes are fixedly connected with rubber rings.

[0012] Preferably, the arc detection assembly consists of an induction telescopic rod and a detection arc plate. The outer wall of the detection arc plate is fixedly connected to the inner wall of the detection wind ring through the induction telescopic rod. A pressure sensor is provided in the induction telescopic rod, and multiple detection arc plates are evenly arranged in a circular array.

[0013] Preferably, the outer wall of the detection wind ring is fixedly connected with a plurality of wind pressure fan blades arranged in a circular array, and annular grooves are provided on both end faces of the detection wind ring. The gas acceleration chamber is located in the upper right-angle chamber and the lower right-angle chamber, which are respectively slidably connected to the inner walls of the annular grooves on the two detection wind rings through a plurality of right-angle fixed rods.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. This solution uses the Bernoulli effect to generate a high-speed airflow ring through the setting of a high-pressure air pump and a gas acceleration chamber, actively adsorbing discrete cooling water mist to the surface of the rod to avoid deformation caused by water flow impact. The zigzag cooling cover evenly distributes the water mist, achieving synchronous and uniform cooling of multiple rods, eliminating local thermal stress, and realizing non-contact aerosol cooling technology.

[0015] 2. This solution uses the detection wind ring and arc detection components to drive the detection arc plate to slide and contact the surface of the rod. By sensing the pressure changes of the telescopic rod, small deformations or defects can be identified in real time. The flexible rubber ring protects the surface of the rod to avoid detection damage. The instant alarm mechanism shortens the fault response time and reduces the scrap rate.

[0016] 3. This solution uses a fog machine and a circular cooling hood to utilize aerosol collaborative cooling, which is more water-saving than traditional water cooling. The cooling rate is controllable, reducing energy waste. The entire process from extrusion to cooling and testing is controlled in parallel, systematically improving efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of a devolatilization extruder for fluoroplastic processing proposed by the present invention; Figure 2 This is an assembly diagram of part of the structure of a devolatilization extruder for fluoroplastic processing proposed by the present invention; Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4 This is a schematic diagram of the structure inside the extrusion chamber of a devolatilization extruder for fluoroplastic processing proposed by the present invention; Figure 5 This is a structural schematic diagram of the position of the circular cooling hood in a devolatilization extruder for fluoroplastic processing proposed by the present invention; Figure 6 This is a schematic structural diagram of the positions of two gas acceleration chambers in a devolatilization extruder for fluoroplastic processing proposed by the present invention; Figure 7 This is a schematic diagram of the structure inside the gas acceleration chamber of a devolatilization extruder for fluoroplastic processing proposed by the present invention; Figure 8 The present invention provides a schematic structural diagram of an arc detection assembly in a devolatilization extruder for processing fluoroplastics.

[0018] In the figure: 1. Extrusion chamber; 2. Molding cavity; 3. Plane base; 4. Feed hopper; 5. Drive motor; 6. Drive gear; 7. Main gear; 8. Sub-gear; 9. Spiral extrusion blade; 10. Drain seat; 11. Cooling chamber; 12. Fog maker; 13. Circular cooling hood; 14. PVDF rod; 15. Docking plate; 16. Shaping ring; 17. Pressurizing bucket; 18. Gas acceleration chamber; 19. Sealing plate; 20. High-pressure air pump; 21. Rubber ring; 22. Right-angle fixing rod; 23. Detection wind ring; 24. Wind pressure fan blade; 25. Induction telescopic rod; 26. Detection arc plate. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0020] In the description of the present invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "mounted / connected," and "connected" should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention in specific circumstances.

[0022] Example, see Figures 1 to 8 A devolatilization extruder for fluoroplastic processing includes an extrusion chamber 1 and a molding cavity 2 for molding PVDF rods 14. A feed hopper 4 is provided above the feeding end of the extrusion chamber 1. A drive motor 5 is provided at the feeding end of the extrusion chamber 1. The output end of the drive motor 5 is connected to two spiral extrusion blades 9 through a gear assembly. A cooling chamber 11 is fixedly connected to the rear end of the molding cavity 2. A zigzag cooling hood 13 for diffusing cooling water mist is connected to the inner wall of the cooling chamber 11. Furthermore, the gear assembly consists of a driving gear 6, a main gear 7 and a sub-gear 8, which mesh with each other in sequence. The output end of the driving motor 5 is fixedly connected to the end of the driving gear 6 through a driving shaft, and the two outer side walls of the extrusion chamber 1 are fixedly connected to the planar base 3 through a plurality of supports. The ends of the main gear 7 and the sub-gear 8 are fixedly connected to the inner side wall of the spiral extrusion blade 9 through a rotating shaft, and the side wall of the spiral extrusion blade 9 is rotatably connected to the inner side wall of the extrusion chamber 1. The top of the planar base 3 is fixedly connected to the bottom end of the cooling chamber 11 through a drain seat 10, and a plurality of drainage holes are provided on both side walls of the drain seat 10. The left and right side walls and the upper side wall of the cooling chamber 11 are fixedly connected with a fog machine 12 for generating cooling water mist. The front end of the cooling chamber 11 is fixedly connected to the end of the forming cavity 2. The cooling water mist condenses into water droplets after cooling and drips into the drain seat 10, and is collected through the multiple drainage holes on the drain seat 10. It should be noted that: the driving motor 5 is started to drive the driving gear 6 to rotate through the driving shaft, the driving gear 6 rotates to drive the main gear 7 to rotate, and the main gear 7 rotates to drive the meshing sub-gear 8 to rotate together, thereby driving the two spiral extrusion blades 9 in the extrusion chamber 1 to rotate with each other, and then the production raw materials of the PVDF rod 14 are put into the hopper 4, so that after the raw materials are hot-melted, they are continuously squeezed by the two spiral extrusion blades 9 into the forming cavity 2 for devolatilization and extrusion, and the forming cavity 2 synchronously extrude multiple PVDF rods 14, and at the same time, multiple fog machines 12 are started to generate a large amount of cooling water mist into the circular cooling cover 13; The above advantages are as follows: a large amount of discrete cooling water mist can be generated at the extrusion end of the forming cavity 2 by the meandering cooling cover 13, which facilitates the subsequent control of the cooling water mist to cool the surface of the just-extruded PVDF rod 14; Two gas acceleration chambers 18 are provided on one side of the cooling chamber 11. The gas acceleration chamber 18 consists of two right-angled chambers, one above the other. The top of the gas acceleration chamber 18 is connected to a high-pressure air pump 20 through a sealing plate 19. Furthermore, a docking plate 15 is fixedly connected to the rear end of the cooling chamber 11, and a plurality of docking holes corresponding to the extrusion port positions on the molding cavity 2 are provided on the docking plate 15. The inner diameter of the docking hole is slightly larger than the diameter of the PVDF rod 14. The side wall of the docking plate 15 at the docking hole is connected to a pressure bucket 17 through a plurality of shaping rings 16. The rough end of the pressure bucket 17 is fixedly connected to the lower end of the gas acceleration chamber 18. The top of the gas acceleration chamber 18 is fixedly connected to the bottom end of the sealing plate 19. The high-pressure air pump 20 is communicated with the right-angle chamber above and the right-angle chamber below the gas acceleration chamber 18 through a plurality of branch pipes. The right-angle chamber above and the right-angle chamber below the gas acceleration chamber 18 are respectively provided with a rod-through hole and two rod-through holes, and the inner side walls of the plurality of rod-through holes are fixedly connected with rubber rings 21. It should be noted that: when it is necessary to cool the surface of the PVDF rod 14 just extruded, the high-pressure air pump 20 is started to introduce high-speed airflow into the upper right-angle chamber and the lower right-angle chamber in the two gas acceleration chambers 18 through multiple branches. The high-speed airflow is discharged onto the annular surface of the PVDF rod 14 through the pressure bucket 17 and the shaping ring 16, thereby forming a high-speed airflow ring on the annular surface of the PVDF rod 14. According to the Bernuco principle, the faster the airflow ring is, the smaller the pressure at its location is, and the higher the pressure at the PVDF rod 14 is. The high-speed air flow ring on the annular surface will cause the external air to be pressed toward the position of the air flow ring. When the high-speed air flow ring moves in the meandering cooling cover 13, the air with cooling water mist will move toward the annular surface of the PVDF rod 14, thereby achieving cooling and shaping on the surface of the PVDF rod 14. In order to ensure the molding quality of the PVDF rod 14, the extrusion speed of the PVDF rod 14 with a slightly larger diameter is usually slow. Therefore, the influence of the slight hysteresis of the cooling method of the air flow ring continuously impacted in the gas acceleration chamber 18 can be ignored. The above advantages are as follows: in this way, a high-speed airflow ring can be formed on the annular surface of the PVDF rod 14 by utilizing the gas acceleration chamber 18. The rapid movement of the airflow ring reduces the air pressure on the annular surface of the PVDF rod 14, thereby continuously moving the external air containing the cooling water mist to the surface of the PVDF rod 14, thereby achieving uniform cooling of multiple PVDF rods 14 simultaneously, and preventing the PVDF rods 14 from being impacted by the water flow during cooling; The inner wall of the right-angle chamber above the gas acceleration chamber 18 and the inner wall of the right-angle chamber below the gas acceleration chamber 18 are connected to a detection air ring 23 through a right-angle fixed rod 22. The inner wall of the detection air ring 23 is connected to a plurality of arc detection components for detecting the surface smoothness of the PVDF rod 14; Furthermore, the arc detection assembly is composed of an inductive telescopic rod 25 and a detection arc plate 26. The outer wall of the detection arc plate 26 is fixedly connected to the inner wall of the detection wind ring 23 through the inductive telescopic rod 25. A pressure sensor is provided in the inductive telescopic rod 25. A plurality of detection arc plates 26 are evenly arranged in an annular array. A plurality of wind pressure fan blades 24 arranged in an annular array are fixedly connected to the outer wall of the detection wind ring 23. An annular chute is provided on both end surfaces of the detection wind ring 23. The gas acceleration chamber 18 is located in the upper right-angle chamber and the lower right-angle chamber, respectively, and is slidably connected to the inner walls of the annular chute on the two detection wind rings 23 through a plurality of right-angle fixing rods 22. It should be noted that: during the extrusion process of multiple PVDF rods 14, they will pass through the right-angle chamber located above the gas acceleration chamber 18 and one rod-through hole and two rod-through holes on the right-angle chamber located below, and the rubber ring 21 on the inner side wall of the rod-through hole will flexibly contact the surface of the PVDF rod 14 to avoid damage to the PVDF rod 14 during movement. When the high-pressure air pump 20 generates airflow, the airflow will pass through the wind pressure fan blades 24 on the detection air ring 23. The obliquely arranged wind pressure fan blades 24 will be impacted by the airflow and will drive the entire detection air ring 23 to rotate on the right-angle fixed rod 22. The rotation of the detection air ring 23 will drive the rotation of the multiple detection arc plates 26 through the multiple sensing telescopic rods 25, so that the multiple detection arc plates 26 are pressed against the surface of the PVDF rod 14 and perform contact sliding on the arc surface. If there is deformation or defect on the surface of the PVDF rod 14, the detection arc plate 26 will be displaced in the direction of the sensing telescopic rod 25 at the deformation or defect, thereby causing the pressure sensor value on the sensing telescopic rod 25 to change. The above benefits are as follows: this can facilitate the rapid and timely detection of minor deformations and defects on the PVDF rod 14, and facilitate technicians to check whether the deformation of the PVDF rod 14 in this section is an accidental defect in production or a problem in the front-end molding process, thereby avoiding greater production losses and ensuring the high quality of the output PVDF rod 14; When the present invention is in use, the driving motor 5 is started to drive the driving gear 6 to rotate through the driving shaft, and the driving gear 6 rotates to drive the main gear 7 to rotate, and the main gear 7 rotates to drive the meshing sub-gear 8 to rotate together, thereby driving the two spiral extrusion blades 9 in the extrusion chamber 1 to rotate with each other, and then the production raw materials of the PVDF rod 14 are put into the hopper 4, so that after the raw materials are hot-melted, they are continuously squeezed by the two spiral extrusion blades 9 into the forming cavity 2 for devolatilization and extrusion, and the forming cavity 2 synchronously extrude multiple PVDF rods 14, and at the same time, multiple fog machines 12 are started to generate a large amount of cooling water mist into the meandering cooling cover 13, so that a large amount of discrete cooling water mist can be generated at the extrusion end of the forming cavity 2 through the meandering cooling cover 13, so that the cooling water mist can be controlled to cool the surface of the PVDF rod 14 just extruded. When it is necessary to cool the surface of the PVDF rod 14 just extruded, the high-pressure air pump 20 is started to introduce high-speed airflow into the upper right-angle chamber and the lower right-angle chamber in the two gas acceleration chambers 18 through multiple branches. The high-speed airflow is discharged onto the annular surface of the PVDF rod 14 through the pressure bucket 17 and the shaping ring 16, thereby forming a high-speed airflow ring on the annular surface of the PVDF rod 14. According to the Bernuco principle, the faster the speed of the airflow ring, the smaller the pressure at its location. The high-speed airflow ring on the annular surface of the PVDF rod 14 will cause the external air to pressurize the position of the airflow ring, and the high-speed airflow ring will cause the external air to pressurize the position of the airflow ring. When the flow ring moves in the meandering cooling cover 13, the air with the cooling water mist moves toward the annular surface of the PVDF rod 14, thereby achieving cooling and shaping on the surface of the PVDF rod 14. In this way, a high-speed air flow ring can be formed on the annular surface of the PVDF rod 14 by utilizing the gas acceleration chamber 18. The rapid movement of the air flow ring reduces the air pressure on the annular surface of the PVDF rod 14, thereby continuously moving the external air containing the cooling water mist toward the surface of the PVDF rod 14, thereby achieving uniform cooling of multiple PVDF rods 14 simultaneously, and preventing the PVDF rod 14 from being impacted by the water flow during cooling; During the extrusion of multiple PVDF rods 14, they will pass through the right-angle chamber located above the gas acceleration chamber 18 and one rod-through hole and two rod-through holes on the right-angle chamber located below, and the rubber ring 21 on the inner side wall of the rod-through hole will flexibly contact the surface of the PVDF rod 14 to avoid damage to the PVDF rod 14 during movement. When the high-pressure air pump 20 generates airflow, the airflow will pass through the wind pressure fan blades 24 on the detection air ring 23. The obliquely arranged wind pressure fan blades 24 will be impacted by the airflow and will drive the entire detection air ring 23 to rotate on the right-angle fixed rod 22. The rotation of the detection air ring 23 will drive the rotation of multiple detection arc plates 26 through multiple sensing telescopic rods 25, so that the multiple detection arc plates 26 are pressed against the surface of the PVDF rod 14 and perform contact sliding on the arc surface. If there is deformation or defect on the surface of the PVDF rod 14, the detection arc plate 26 will be displaced in the direction of the sensing telescopic rod 25 at the deformation or defect, thereby causing The pressure sensor value on the sensing telescopic rod 25 changes. Since the detection arc plate 26 is pressed on the surface of the PVDF rod 14 for detection, the rotation of the detection air ring 23 is in an obstructed state, the rotation speed is relatively low, and the centrifugal force caused by its rotation is extremely small. The impact on the sensing telescopic rod 25 is within the normal value fluctuation range and can be ignored. The sensing telescopic rod 25 cooperates with the detection arc plate 26 to detect whether there are abnormal defects in a certain section of the PVDF rod 14. If an abnormality occurs in a continuous section, it will be further determined whether it is in the same position, and then it will be judged whether it is caused by a process defect. This can facilitate the rapid and timely detection of minor deformations and defects on the PVDF rod 14, and facilitate technicians to check in time according to the deformation situation whether the deformation of the PVDF rod 14 in this section is an accidental defect in production or caused by problems in the front-end molding process, thereby avoiding greater production losses and ensuring the high quality of the output PVDF rod 14.

[0023] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A devolatilizing extruder for processing fluoroplastics, comprising an extrusion chamber (1) and a molding cavity (2) for molding PVDF rods (14), characterized in that: A feed hopper (4) is provided above the feed end of the extrusion chamber (1), a drive motor (5) is provided at the feed end of the extrusion chamber (1), an output end of the drive motor (5) is connected to two spiral extrusion blades (9) via a gear assembly, a cooling chamber (11) is fixedly connected to the rear end of the molding cavity (2), and a circular cooling hood (13) for diffusing cooling water mist is connected to the inner side wall of the cooling chamber (11); Two gas acceleration chambers (18) are provided on one side of the cooling chamber (11), and the gas acceleration chamber (18) consists of two upper and lower right-angle chambers. The top of the gas acceleration chamber (18) is connected to a high-pressure air pump (20) through a sealing plate (19). The inner wall of the right-angle chamber located above and the inner wall of the right-angle chamber located below of the gas acceleration chamber (18) are both connected to a detection air ring (23) through a right-angle fixed rod (22). The inner wall of the detection air ring (23) is connected to a plurality of arc detection components for detecting the surface smoothness of the PVDF rod (14).

2. A devolatilization extruder for fluoroplastic processing according to claim 1, characterized in that: The gear assembly consists of a driving gear (6), a main gear (7) and a sub-gear (8), wherein the driving gear (6), the main gear (7) and the sub-gear (8) are meshed with each other in sequence, the output end of the driving motor (5) is fixedly connected to the end of the driving gear (6) via a driving shaft, and the two outer side walls of the extrusion chamber (1) are fixedly connected to the planar base (3) via a plurality of supports.

3. A devolatilization extruder for fluoroplastic processing according to claim 2, characterized in that: The ends of the main gear (7) and the auxiliary gear (8) are fixedly connected to the inner side wall of the spiral extrusion blade (9) through a rotating shaft, and the side wall of the spiral extrusion blade (9) is rotatably connected to the inner side wall of the extrusion chamber (1). The top of the planar base (3) is fixedly connected to the bottom end of the cooling chamber (11) through a drainage seat (10), and a plurality of drainage holes are provided on both side walls of the drainage seat (10).

4. A devolatilization extruder for fluoroplastic processing according to claim 1, characterized in that: The left and right side walls and the upper side wall of the cooling chamber (11) are fixedly connected to a fog machine (12) for generating cooling water mist, and the front end of the cooling chamber (11) is fixedly connected to the end of the forming cavity (2).

5. A devolatilization extruder for fluoroplastic processing according to claim 1, characterized in that: A docking plate (15) is fixedly connected to the rear end of the cooling chamber (11), and a plurality of docking holes corresponding to the positions of the extrusion ports on the molding cavity (2) are formed on the docking plate (15), and the inner diameter of the docking holes is slightly larger than the diameter of the PVDF rod (14).

6. A devolatilization extruder for fluoroplastic processing according to claim 5, characterized in that: The side wall of the docking plate (15) at the docking hole is connected to a pressure bucket (17) via a plurality of shaping rings (16), and the rough end of the pressure bucket (17) is fixedly connected to the lower end of the gas acceleration chamber (18).

7. A devolatilization extruder for fluoroplastic processing according to claim 1, characterized in that: The top end of the gas acceleration chamber (18) is fixedly connected to the bottom end of the sealing plate (19), and the high-pressure air pump (20) is communicated with the right-angle chamber located above and the right-angle chamber located below the gas acceleration chamber (18) through a plurality of branch pipes. The right-angle chamber located above and the right-angle chamber located below of the gas acceleration chamber (18) are respectively provided with one rod-through hole and two rod-through holes, and the inner side walls of the plurality of rod-through holes are fixedly connected with rubber rings (21).

8. A devolatilization extruder for fluoroplastic processing according to claim 1, characterized in that: The arc detection assembly is composed of a sensing telescopic rod (25) and a detection arc plate (26); the outer wall of the detection arc plate (26) is fixedly connected to the inner wall of the detection wind ring (23) through the sensing telescopic rod (25); a pressure sensor is provided in the sensing telescopic rod (25); and a plurality of detection arc plates (26) are evenly arranged in a ring array.

9. A devolatilization extruder for fluoroplastic processing according to claim 1, characterized in that: The outer side wall of the detection wind ring (23) is fixedly connected to a plurality of wind pressure fan blades (24) arranged in a ring array, and annular slide grooves are provided on both end surfaces of the detection wind ring (23). The right-angle chamber located above and the right-angle chamber located below of the gas acceleration chamber (18) are respectively slidably connected to the inner side walls of the annular slide grooves on the two detection wind rings (23) through a plurality of right-angle fixed rods (22).

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