CN117400439A

CN117400439A - Polytetrafluoroethylene granulator

Info

Publication number: CN117400439A
Application number: CN202311577855.6A
Authority: CN
Inventors: 韩斌
Original assignee: Jinan Sinoflon New Material Co ltd
Current assignee: Jinan Sinoflon New Material Co ltd
Priority date: 2023-11-24
Filing date: 2023-11-24
Publication date: 2024-01-16

Abstract

The invention relates to the technical field of polytetrafluoroethylene processing equipment, in particular to a polytetrafluoroethylene granulator. The device comprises an operation table, a screw extrusion mechanism, an extrusion disc and a rotary cutting device, wherein the screw extrusion mechanism, the extrusion disc and the rotary cutting device are arranged on the operation table, the extrusion disc is arranged at the extrusion end of the screw extrusion mechanism, and a plurality of extrusion holes which are equidistant and distributed in a circular shape are formed in the extrusion disc. The rotary cutting device is located at the discharging side of the extrusion disc and is used for cutting strip materials extruded from the extrusion holes, and the rotary cutting device comprises a rotating shaft assembly, a fixing assembly and a cutting knife assembly, wherein each group of cutting knife assemblies comprises two cutting knives which are arranged oppositely, the two cutting knives are arranged along the extrusion direction of the strip materials in sequence, and due to the fact that the extrusion disc and the rotary cutting device are adopted, high-efficiency and accurate cutting can be conducted on extruded polytetrafluoroethylene particles, and granulation quality and efficiency are improved.

Description

Polytetrafluoroethylene granulator

Technical Field

The invention relates to the technical field of polytetrafluoroethylene processing equipment, in particular to a polytetrafluoroethylene granulator.

Background

Polytetrafluoroethylene (PTFE) is a high-performance plastic with excellent chemical stability, electrical insulation, high and low temperature resistance, low frictional resistance, and non-tackiness. Therefore, it has a wide range of applications in various industrial fields, such as the automotive industry, the electronic industry, medical instruments, and the like. In these applications, polytetrafluoroethylene typically requires a pelletization process by a pelletizer to facilitate further processing and application.

Conventional polytetrafluoroethylene pelletizers typically include a screw extrusion mechanism that extrudes polytetrafluoroethylene feedstock through its extrusion end and forms a strip of material. Then, the strip-shaped material is sent to a cutting device for cutting, so that the required granular material is obtained.

However, since the speed of extruding the strip-shaped material by the screw extruding mechanism is influenced by a plurality of parameters such as the rotating speed of the screw and the temperature, the cutting precision and the stability of the cutting device are difficult to control, the size of the granules is uneven, and the quality of the granules is influenced.

Therefore, it is necessary to develop a novel polytetrafluoroethylene granulator that can improve the granulation effect of polytetrafluoroethylene and improve the granulation quality and efficiency.

Disclosure of Invention

The technical problems to be solved by the invention are as follows: the existing polytetrafluoroethylene granulator cannot be used for preparing polytetrafluoroethylene granules with regular shapes and consistent sizes due to the problems of cutter design, operation control and the like.

(II) technical scheme

In order to solve the technical problems, an embodiment of the present invention provides a polytetrafluoroethylene granulator, including a working table and a screw extrusion mechanism disposed on the working table, wherein an extrusion end of the screw extrusion mechanism extends out of the working table, and further includes an extrusion disc and a rotary cutting device:

the extrusion disc is arranged at the extrusion end of the screw extrusion mechanism, and a plurality of extrusion holes which are equidistant and are distributed in a circular shape are formed in the extrusion disc;

the rotary cutting device is positioned at the discharging side of the extrusion disc and is used for cutting the strip-shaped materials extruded by the extrusion holes, and comprises a rotating shaft assembly, a fixing assembly and a cutting knife assembly, wherein the rotating axis of the rotating shaft assembly is perpendicular to the extrusion disc and is concentrically distributed in a ring shape of the extrusion holes;

the cutting knife assemblies are provided with a plurality of groups, each group of cutting knife assemblies comprises two cutting knives which are arranged oppositely, and the two cutting knives are provided with preset intervals and are sequentially arranged along the extrusion direction of the strip-shaped materials; the cutting knife assemblies are arranged on the rotating shaft assemblies at equal intervals around the rotating direction of the rotating shaft assemblies through fixing assemblies arranged on the rotating shaft assemblies.

According to one embodiment of the invention, the rotating shaft assembly comprises a main shaft, a plurality of cross beams and a fixed disc, wherein the main shaft penetrates through the center of the fixed disc and is fixedly connected with the fixed disc, the number of the cross beams is the same as that of the cutting knife assemblies, each cross beam is parallel to the main shaft and coaxially surrounds the main shaft, one end of each cross beam is fixedly connected with the disc surface of the fixed disc, so that a plurality of U-shaped cutting sections are formed, and the openings of the U-shaped cutting sections face extrusion holes of the extrusion disc; the fixing component is arranged in the U-shaped cutting interval and comprises two groups of fixing pieces which are oppositely arranged, and each fixing piece comprises a base, a supporting piece and a cutter clamp which are sequentially connected, so that the cutters are vertically arranged between the cutter clamps, the cutter component is more stable in the process of rotating and cutting strip-shaped materials, and deviation deformation is not easy to occur.

According to one embodiment of the invention, at least one of the two groups of bases is connected with the rotating shaft assembly in an axially sliding manner, and the sliding of the bases is used for adjusting the distance between the two cutting knives, so that the length of the granules is accurately controlled, and different material requirements are met.

According to one embodiment of the invention, the cutter is an arc-shaped cutter, and the arc-shaped cutter can enable the cutting end face of the granules to be smoother, and is beneficial to increasing the volume of single materials.

According to one embodiment of the invention, the arc-shaped knife is an elastic blade, the supporting pieces at the two ends of the arc-shaped knife are opposite provided with telescopic compression bars, and the ends of the arc-shaped knife are pressed by the telescopic compression bars, so that the radian of the blade is adjustable, and the granulating requirements of granules in different shapes are met.

According to one embodiment of the invention, a positioning and rotating device is further arranged between the base and the supporting piece and used for adjusting the cutting angle of the cutter, and the shape of the granules is further adjusted by adjusting the cutting angle of the cutter and the strip-shaped material.

According to an embodiment of the invention, the positioning and rotating device comprises a rotating shaft and a connecting plate, wherein the rotating shaft and the connecting plate are arranged on one side of the supporting piece, and the base is provided with a limiting groove for the rotating angle of the supporting piece, and the limiting groove is used for preventing the adjusting angle from being overlarge.

According to one embodiment of the invention, the extruding disc is provided with 9 extruding holes, the cutter assemblies are provided with three groups, and the granulating efficiency can be improved and the size of slag can be effectively reduced by reasonably setting the rotating speed of the discharging speedometer rotary cutting device of the extruding disc.

According to one embodiment of the invention, the granule separating device is further arranged below the rotary cutting device and used for receiving and screening granules and slag materials cut by the rotary cutting device, and the granule separating device comprises a material receiving opening, a screening component, a granule pipeline and a slag material pipeline, wherein the material receiving opening is arranged below the plurality of groups of cutting knife components and is connected with the screening component, and the screening component is respectively connected with the granule pipeline and the slag material pipeline.

According to one embodiment of the invention, the polytetrafluoroethylene granulator further comprises a granule bin and a raw material inlet, wherein the granule pipeline is communicated with the granule bin, the slag pipeline is communicated with the raw material inlet, and slag is recovered for circulating operation.

(III) the beneficial effects of the invention are that: by arranging the rotary cutting device, the strip-shaped materials extruded by the extrusion holes can be rapidly and accurately cut into granules on the discharge side of the extrusion disc, so that the speed and the precision of granulation are improved, and meanwhile, the stretching and the breakage of the strip-shaped materials can be reduced; the rotating shaft assembly drives the two cutters which are correspondingly arranged to rotate, so that polytetrafluoroethylene strip materials extruded by the extruding disc can be efficiently and accurately cut, each strip material is ensured to be cut into granules with the same length, and the uniformity and stability of granulation are improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic perspective view of a polytetrafluoroethylene granulator according to an embodiment of the present invention;

fig. 2 is a schematic internal perspective view of a polytetrafluoroethylene granulator according to an embodiment of the present invention;

FIG. 3 is a schematic view of a butt joint structure between a rotary cutting device and an extrusion disc of a polytetrafluoroethylene granulator according to an embodiment of the present invention;

fig. 4 is a schematic perspective view of a rotary cutting device of a polytetrafluoroethylene granulator according to an embodiment of the present invention;

fig. 5 is a schematic perspective view of a cutting end of a rotary cutting device of a polytetrafluoroethylene granulator according to an embodiment of the present invention;

fig. 6 is a schematic right-side view of a rotary cutting device of a polytetrafluoroethylene granulator according to an embodiment of the present invention;

fig. 7 is a schematic diagram of a U-shaped cutting section of a polytetrafluoroethylene granulator according to an embodiment of the present invention.

Icon: 1. a work table; 2. a screw extrusion mechanism; 21. a raw material inlet; 3. extruding a tray; 31. extruding the hole; 4. a rotary cutting device; 41. a spindle assembly; 411. a main shaft; 412. a cross beam; 413. a fixed plate; 42. a fixing assembly; 421. a base; 422. a support; 4221. a retractable compression bar; 423. a cutter clamp; 424. a rotating device; 4241. a rotating shaft; 4242. a connecting plate; 4243. a limit groove; 43. a cutter assembly; 44. a slide rail; 45. a housing; 5. a pellet separation device; 51. a material receiving port; 52. a screen assembly; 53. a pellet line; 54. a slag pipeline; 6. and a grain bin.

Detailed Description

In order that the above-recited objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings and are described in the appended drawings, without any conflict. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In this embodiment, the invention provides a polytetrafluoroethylene granulator, which is mainly used for solving the problem that the traditional polytetrafluoroethylene granulator may not be capable of effectively meeting the requirement of mass production, and meanwhile, polytetrafluoroethylene particles with regular shapes and consistent sizes may not be prepared due to the problems of design, operation control and the like of a cutter.

As shown in fig. 1 to 7, the polytetrafluoroethylene granulator provided by the invention comprises a workbench 1, a screw extrusion mechanism 2, an extrusion disc 3, a rotary cutting device 4, a granule separating device 5, a granule bin 6 and a raw material inlet 21.

As shown in fig. 1, a work table 1 is a basic part of an apparatus for supporting and fixing other components. A screw extrusion mechanism 2 is mounted on the working table 1. The screw extrusion mechanism 2 is used for extruding polytetrafluoroethylene particles into a key part of strip materials through heating, plasticizing and extruding. The screw extrusion mechanism 2 comprises a feed inlet, a heating cylinder, a screw and an extrusion head. The feed port is a portion for feeding polytetrafluoroethylene particles into the heating cylinder. The heating cylinder is a part for heating and plasticizing polytetrafluoroethylene particles. The screw is a part for extruding and conveying polytetrafluoroethylene particles. The extrusion head is used for extruding the plasticized polytetrafluoroethylene particles into a strip-shaped material. The extrusion end of the screw extrusion mechanism 2 extends to the outside of the operation table 1, so that the design can effectively utilize space, the extruded strip-shaped materials can be conveniently subjected to subsequent treatment, and in addition, the table surface of the operation table 1 is also provided with a heat dissipation hole for reducing the temperature of the screw extrusion mechanism 2.

On the extrusion end of the screw extruder 2, an extrusion disk 3 is provided in particular. The extruding disc 3 is provided with a plurality of extruding holes 31 which are equidistant and distributed in a circular ring shape. The number and position of the extrusion holes 31 can be set according to actual production requirements, and the equidistant design can ensure the consistency of the thickness and length of the extruded strip-shaped materials, thereby improving the quality of the product. The extruding disc 3 is connected with the extruding head through threads, so that the extruding discs 3 with different specifications can be conveniently replaced.

As shown in fig. 3 and 4, a rotary cutting device 4 is provided on the discharge side of the extrusion tray 3 for cutting the extruded strip. This rotary cutting apparatus 4 includes a spindle assembly 41, a stationary assembly 42, a cutter assembly 43, and a housing 45. The fixing component 42 and the cutter component 43 are positioned inside the housing 45, the housing 45 is in butt joint with the screw extrusion mechanism 2 on the platform, and the bottom is provided with an opening. The spindle assembly 41 is the drive portion of the cutting device that drives the spindle 411 to rotate by a motor or other power source. The main shaft 411 is arranged in the center of the fixed disc 413 in a penetrating manner and is fixedly connected with the fixed disc 413, the number of the cross beams 412 is the same as that of the cutter assemblies 43, each cross beam 412 is parallel to the main shaft 411 and coaxially surrounds the main shaft 411, the inner ends of the cross beams 412 are fixedly connected with the disc surface of the fixed disc 413, so that a plurality of U-shaped cutting sections are formed, the openings of the U-shaped cutting sections face the extrusion holes 31 of the extrusion disc 3, and one fixing assembly 42 is arranged in each U-shaped cutting section. The fixing assembly 42 includes two sets of oppositely disposed fixing members, each of which includes a base 421, a support 422, and a cutter holder 423. The cutter holder 423 is a portion for fixing the cutter, and the supporting member 422 and the base 421 are portions for fixing and supporting the cutter holder 423. Through such design, can ensure the stability of cutting knife in the cutting process, avoid the cutting error that arouses because the vibration of cutting knife.

As shown in fig. 5-7, each set of fixing elements 42 comprises two opposing cutters, which are critical portions for cutting the strip. The shape and material design of the cutter are key factors. The design of the cutter is about whether the cutting operation can be accurately, quickly and efficiently performed. In this design, the cutter is designed to be arc-shaped, which is advantageous for more accurate cutting of the extruded strip-like material. The arc-shaped knife is designed to enable the cutting process to be smoother, friction and resistance possibly generated in the cutting process are reduced, and cutting efficiency and accuracy are improved.

In addition, the cutting knife is composed of an elastic blade, and the design can absorb vibration generated in the cutting process of the cutting knife to a certain extent, so that the stability of the cutting knife is ensured. The design of the elastic blade enables the cutter to properly adjust the elasticity of the blade according to actual needs when facing materials with different hardness, and errors in the cutting process are avoided.

Meanwhile, the supporting member 422 is a telescopic compression bar 4221 formed of a telescopic member connection member for controlling the arc of the arc-shaped knife. Thus, even if facing different sized materials, accurate cutting can be achieved by adjusting the length of the support 422, controlling the arc of the cutter. The design can not only effectively avoid cutting errors caused by vibration of the cutting knife and improve the cutting precision and efficiency, but also improve the adaptability of the equipment, so that the equipment can meet the working requirements of various different conditions.

A rotation device 424 is arranged between the base 421 and the supporting piece 422 for adjusting the angle of the cutter. The design can keep the optimal cutting angle of the cutter during the cutting process, the rotating device 424 comprises a rotating shaft 4241 and a connecting plate 4242 which are arranged on one side of the supporting piece 422, and the base 421 is provided with a limiting groove 4243 for limiting the rotating angle of the supporting piece 422. By rotating the rotating shaft, the connecting plate 4242 can drive the supporting member 422 and the cutter holder 423 to rotate, thereby changing the angle of the cutter. The limiting groove 4243 may prevent the support 422 from rotating excessively, causing deviation or damage of the cutter. Through this kind of design, can be according to different material characteristics and granule demand, adjust the cutting angle of cutting knife and strip material, further change the shape and the size of granule.

One of the two groups of bases 421 is slidably connected with the spindle assembly 41 along the axial direction through a sliding rail 44 arranged between the spindle assembly 411, and the distance between the two cutters is adjusted by sliding the bases 421, so that the length of the granules is accurately controlled, and different material requirements are met.

As shown in fig. 1, 3 to 6, the spindle assembly 41 is a driving part of the rotary cutting apparatus 4, which drives the spindle 411 to rotate by a motor or other power source. The main shaft 411 is connected with a plurality of cross beams 412 and fixed discs 413, the number of the cross beams 412 is the same as that of the cutter assemblies 43, the cross beams 412 are arranged around the main shaft 411 in parallel, and the cross beams 412 are fixedly connected with the main shaft 411 through the fixed discs 413. This forms a plurality of U-shaped cutting zones of the extrusion orifice 31 towards the extrusion disk 3.

When the rotating shaft assembly 41 rotates, the two cutters in each U-shaped cutting section correspondingly cut a strip-shaped material to form particles. Since the plurality of U-shaped cutting sections are equidistantly arranged along the rotation direction of the main shaft 411, a plurality of strip-shaped materials can be cut at the same time, and the granulating efficiency is improved. Meanwhile, as the two cutters in each U-shaped cutting interval are provided with preset intervals and are sequentially distributed along the extrusion direction of the strip-shaped materials, the size consistency of particles can be ensured, the granulation quality is improved, and meanwhile, the rotation of the rotating shaft assembly 41 in the process of cutting the materials can be controlled through an automatic programming system, so that the cut particles have different shapes.

In this embodiment, the extrusion disc 3 is provided with 9 extrusion holes 31 and the cutter assembly 43 is provided with three sets. The design ensures that the polytetrafluoroethylene granulator can rapidly and accurately extrude and cut a large amount of strip materials in one working period, thereby greatly improving the production efficiency and reducing the production cost. Meanwhile, the design also enables the polytetrafluoroethylene granulator to be more suitable for large-scale and high-efficiency production requirements, and meets the requirements of modern industrial production.

In the design of polytetrafluoroethylene granulator, particular concerns are also taken into account regarding handling of slag that may occur during extrusion and cutting. For this purpose, a pellet separation device 5 is arranged below the rotary cutting device 4 of the apparatus. The pellet separation device 5 is used for carrying out secondary treatment on the strip-shaped materials extruded through the extrusion holes 31 and cut by the cutters in the pelletization process, and separating slag materials from the strip-shaped materials.

The pellet separation device 5 includes a receiving port 51, a screen assembly 52, a pellet line 53, and a slag line 54. The receiving openings 51 are disposed below the plurality of cutter assemblies 43 and are connected to the screen assemblies 52. The screen assembly 52 is a portion for effectively separating slag and particles from the strip material, and may select an appropriate separation principle and separation mode according to practical needs, for example, separation of slag and particles may be achieved by screening, blowing, centrifuging, and the like.

The screen assemblies 52 are connected to a pellet line 53 and a slag line 54, respectively, to deliver the separated pellets and slag to the respective locations. The pellet line 53 is a portion for delivering the separated pellets to the pellet bin 6, and the slag line 54 is a portion for delivering the separated slag to the raw material feed opening 21. Through the design, the purity of the particles can be improved, the quality of products is ensured, the influence of slag on equipment can be avoided, and the service life of the equipment is prolonged. In addition, the separated slag can be collected by a special slag collecting device, and the influence on the environment is reduced by a certain treatment mode, such as recovery, disposal and the like.

The polytetrafluoroethylene granulator also comprises a raw material inlet 21 and a granule bin 6. The raw material inlet 21 is a portion for feeding polytetrafluoroethylene particles into the screw extrusion mechanism 2. The raw material inlet 21 is communicated with the slag pipeline 54, so that slag can be directly recycled to the raw material inlet 21 for further processing, the utilization rate of materials is improved, and waste is reduced. The pellet bin 6 is a part for storing the produced pellets. The pellet bin 6 communicates with a pellet line 53 so that pellets can be transported directly into the pellet bin 6. The pellet bin 6 may be selected to have a suitable capacity and shape depending on the actual throughput and storage requirements. The protection and taking of the particles are also considered in the design of the particle bin 6, so that the particles are prevented from being polluted and damaged, and the particles are convenient to use and transport.

In the actual operation process, the number and the size of the extrusion holes 31, the shape and the size of the cutter, and the arrangement of the granule separating device 5 can be adjusted according to the characteristics of the extruded material and the required granule size, thereby achieving the optimal granulating effect. In addition, the design of the polytetrafluoroethylene granulator also considers the safety of operators, and all moving parts are provided with protection devices to prevent the operators from accidents in the operation process.

The operation process is as follows:

preparation:

polytetrafluoroethylene (PTFE) particles were charged into a suitable hopper and the hopper was connected to a feed inlet.

The granulator is powered on and the equipment is started.

Starting the extrusion mechanism:

the temperature and pressure of the extrusion mechanism are adjusted to achieve the appropriate operating conditions.

The screw extrusion mechanism 2 was started and the feeding of polytetrafluoroethylene pellets into the extrusion mechanism was started.

Adjusting the extrusion disc 3 and the rotary cutting device 4:

the number and arrangement of the extrusion holes 31 on the extrusion plate 3 are adjusted according to the desired particle size and shape. Ensuring that the position and spacing of the extrusion orifices 31 are appropriate for the desired extrusion effect.

The spindle assembly 41 and the cutter assembly 43 in the rotary cutting device 4 are adjusted to correspond to the positions of the extrusion disk 3 and the extrusion orifice 31 and maintain a stable angle.

And (3) granulating:

the rotary cutting means 4 is activated to start the rotation of the spindle assembly 41. Simultaneously, the screw extrusion mechanism 2 extrudes polytetrafluoroethylene particles through the extrusion holes 31 to form a bar-shaped material.

The cutter assembly 43 in the rotary cutting device 4 cuts the extruded strip material into a desired pellet shape as the spindle 411 rotates.

Ensure that the cutting force and the speed of the cutter are suitable to realize accurate cutting effect.

Collecting and separating particles:

below the extrusion orifice 31 suitable collecting means are provided for collecting the cut particles.

If it is desired to separate slag and particles, a bottom pellet separation unit 5 may be used for the separation operation.

The operation is completed:

after the completion of the pelletization operation, the operations of the screw extrusion mechanism 2 and the rotary cutting device 4 are stopped.

And (3) turning off the power supply of the equipment, cleaning and maintaining related components so as to ensure the normal operation and long-term use of the equipment.

In the description of the present invention, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the apparatus or element in question must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the communication may be direct or indirect through an intermediate medium, or may be internal to two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art. Furthermore, in the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.

The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.

Claims

1. The utility model provides a polytetrafluoroethylene granulator, includes the workstation reaches screw extrusion mechanism that sets up on the workstation, screw extrusion mechanism's extrusion end extends to outside the workstation, its characterized in that still includes:

2. The polytetrafluoroethylene granulator according to claim 1, wherein the rotating shaft assembly comprises a main shaft, a plurality of cross beams and a fixed disc, the main shaft penetrates through the center of the fixed disc and is fixedly connected with the fixed disc, the number of the cross beams is the same as that of the cutting knife assemblies, each cross beam is parallel to the main shaft and coaxially surrounds the main shaft, one end of each cross beam is fixedly connected with the disc surface of the fixed disc, so that a plurality of U-shaped cutting sections are formed, and the openings of the U-shaped cutting sections face extrusion holes of the extrusion disc;

the fixing component is arranged in the U-shaped cutting interval and comprises two groups of fixing pieces which are oppositely arranged, and each fixing piece comprises a base, a supporting piece and a cutter clamp which are sequentially connected, so that the cutters are vertically arranged between the cutter clamps.

3. The polytetrafluoroethylene granulator according to claim 2, wherein at least one of the two sets of bases is axially slidably coupled to the shaft assembly.

4. The polytetrafluoroethylene granulator according to claim 2, wherein the cutter is an arcuate cutter.

5. The polytetrafluoroethylene granulator according to claim 4, wherein the arcuate knife is a flexible blade and the support at one end of the arcuate knife is a telescoping plunger.

6. The polytetrafluoroethylene granulator according to any one of claims 2 to 5, wherein a positioning and rotating device is further provided between the base and the support for adjusting the cutting angle of the cutter.

7. The polytetrafluoroethylene granulator according to claim 6, wherein the positioning and rotating device comprises a rotating shaft and a connecting plate, which are arranged on one side of the supporting member, and the base is provided with a limiting groove for the rotating angle of the supporting member.

8. The polytetrafluoroethylene granulator according to claim 7, wherein the extrusion disk is provided with 9 extrusion orifices and the cutter assembly is provided with three sets.

9. The polytetrafluoroethylene granulator according to claim 7, wherein the lower part of the rotary cutting device is further provided with a granule separating device for receiving and screening the granules and slag cut by the rotary cutting device, and the granule separating device comprises a receiving port, a screening assembly, a granule pipeline and a slag pipeline, wherein the receiving port is arranged below the plurality of groups of cutting knife assemblies and is connected with the screening assembly, and the screening assembly is respectively connected with the granule pipeline and the slag pipeline.

10. The polytetrafluoroethylene granulator according to claim 9, further comprising a pellet bin and a raw material feed port, wherein the pellet line is connected to the pellet bin and wherein the slag line is connected to the raw material feed port.