Preparation process of high-toughness polystyrene plastic particles

Abstract

The invention discloses a preparation process of high-toughness polystyrene plastic granules, a plastic granulator is used, the plastic granulator comprises a main body unit (100), a granulating unit (200) and a cooling unit (300), and the specific process adopting the plastic granulator comprises the following steps: S1, weighing the following raw materials in parts by mass; s2, adding into a high-speed mixer, and mixing; s3, feeding the dried mixture into a double-screw extruder for melt blending; s4, the melt is extruded through a machine head and then cooled into strip-shaped materials, the strip-shaped materials are cooled to 25-35 DEG C through a water tank, and the strip-shaped materials are cut into particles with the length being 3-5 mm through a plastic granulator; and S5, carrying out centrifugal dewatering on the particles, and then drying. The sealing piston plate moves and reciprocates under the action of the spring at the same time, cooling liquid is extruded to circulate, the pelletizing blade is refrigerated, high temperature caused by continuous cutting of the pelletizing blade is avoided, and the subsequent machining quality is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of plastic granulation, in particular to a high-toughness polypropylene plastic particle preparation process. BACKGROUND

[0002] Polypropylene (PP) is a general-purpose thermoplastic with excellent comprehensive performance and low price, has the advantages of small density, good chemical corrosion resistance, good electrical insulation and easy processing, and is widely used in the fields of automobiles, home appliances, electronics and daily consumer goods.

[0003] In the process of polypropylene plastic processing and preparation, a granulator is needed for granulation processing. In the existing granulator, the fast granulation of polypropylene plastic causes the blade to heat up, and after a period of use, the blade is prone to adhesion when in contact with polypropylene plastic, reducing the processing quality. SUMMARY

[0004] This section aims to summarize some aspects of the embodiments of the present application and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract and title of the specification to avoid obscuring the purpose of this section, abstract and title, and such simplifications or omissions cannot be used to limit the scope of the present application.

[0005] To solve the above technical problems, the present application provides the following technical solutions: A high-toughness polypropylene plastic particle preparation process uses a plastic granulator, which includes a main unit 100, a granulation unit 200 and a cooling unit 300. The specific process when using the above plastic granulator includes the following: S1, the following raw materials are weighed according to the mass fraction: homopolymer polypropylene 100 parts, ethylene-octene copolymer 10-25 parts, ethylene-propylene rubber 5-15 parts, compatibilizer 2-5 parts, nucleating agent 0.2-0.5 parts, antioxidant 0.2-0.5 parts, optional light stabilizer 0.1-0.3 parts and slip agent 0.1-0.3 parts; S2, the polypropylene base material, ethylene-octene copolymer, ethylene-propylene rubber and compatibilizer are added to a high-speed mixer and mixed at a speed of 1000-1500 rpm for 5-8 minutes; then the antioxidant, nucleating agent and slip agent are added and mixed for another 3-5 minutes, and then dried at 80-100℃ under vacuum conditions for 2-3 hours to remove moisture and volatile substances; S3, the mixture after drying is sent into a twin-screw extruder for melt blending, the temperature of each zone of the extruder is in turn: 170-180 DEG C of feeding section, 180-200 DEG C of compression section, 200-210 DEG C of melting section, 210-220 DEG C of homogenization section, 220-230 DEG C of head, the screw speed is controlled at 150-300 rpm, so that the rubber phase is fully dispersed and forms a uniform microstructure; S4, in the blending process, the negative pressure of-0.08 to-0.09 MPa is kept at the vacuum exhaust port to remove volatile matter and residual moisture, the melt is extruded through the head and then cooled into a strip material, cooled to 25-35 DEG C through a water tank, and cut into particles with a length of 3-5 mm through a plastic pelletizer; S5, after the particles are centrifuged and dewatered, hot air drying is carried out at 70-80 DEG C for 1-2 hours to obtain high-toughness polypropylene plastic particle finished product; The main unit comprises an operating table, a cover plate is fixedly connected to the operating table, a rectangular opening is formed in the operating table, and a material guiding channel is fixedly connected to the operating table; The pelletizing unit comprises two conveying rollers, the two conveying rollers are symmetrically rotatably inserted into the cover plate, a pelletizing roller is rotatably inserted into the cover plate, a plurality of pelletizing blades are fixedly connected to the pelletizing roller, a gear is fixedly connected to the conveying roller, the two gears are meshed with each other, a knocking assembly for knocking the material guiding channel is arranged in the operating table, one end of the conveying roller is fixedly connected to a motor, and a transmission assembly is arranged between the conveying roller, the pelletizing roller and the knocking assembly; The cooling unit comprises a liquid conveying pipe, the liquid conveying pipe is fixedly connected to the pelletizing roller, a first cavity and a second cavity are symmetrically formed in the pelletizing roller, a liquid conveying channel is arranged in the pelletizing roller and the pelletizing blades, the liquid conveying channel is in communication with the first cavity and the second cavity, one end of the pelletizing roller is provided with a movable assembly, and the liquid conveying pipe, the first cavity, the second cavity and the liquid conveying channel are filled with a cooling liquid.

[0006] As a preferred scheme of the high-toughness polypropylene plastic particle preparation process, the inner wall of the cover plate is fixedly connected with a material conveying platform, the material conveying platform cooperates with the two conveying rollers, and the material conveying platform is fixedly connected with a cover plate.

[0007] As a preferred scheme of the high-toughness polypropylene plastic particle preparation process, the knocking assembly comprises a rotating roller, the rotating roller is rotatably connected to the inner wall of the operating table, a plurality of annular plates are fixedly connected to the rotating roller, elastic telescopic rods are fixedly connected to the annular plates, and the elastic telescopic rods cooperate with the material guiding channel.

[0008] As a preferred scheme of the high-toughness polypropylene plastic particle preparation process, the transmission assembly comprises a driving transmission wheel, a first driven transmission wheel and a second driven transmission wheel, the driving transmission wheel is fixedly connected to one end of the upper conveying roller, the first driven transmission wheel is fixedly connected to the pelletizing roller, the second driven transmission wheel is fixedly connected to the rotating roller, and transmission belts are arranged between the driving transmission wheel and the first driven transmission wheel and between the first driven transmission wheel and the second driven transmission wheel.

[0009] As a preferred scheme of the high-toughness polypropylene plastic particle preparation process, the pelletizing roller is rotatably connected with a ring-shaped sleeve at one end, a plurality of arc-shaped openings are formed in the one end of the pelletizing roller, and the infusion tube is fixedly connected to the ring-shaped sleeve and communicates with the first cavity through the arc-shaped openings.

[0010] As a preferred scheme of the high-toughness polypropylene plastic particle preparation process, the movable assembly comprises a sealing piston plate, the sealing piston plate is slidably connected to the inner side wall of the first cavity, a round rod is fixedly connected to the sealing piston plate, and the round rod is slidably inserted into the pelletizing roller.

[0011] As a preferred scheme of the high-toughness polypropylene plastic particle preparation process, the movable assembly further comprises a spring, the spring is fixedly connected between the sealing piston plate and the inner side wall of the first cavity, and the spring is made of stainless steel.

[0012] As a preferred scheme of the high-toughness polypropylene plastic particle preparation process, the round rods are fixedly connected with a rectangular plate, symmetrically fixed blocks are fixedly connected to the rectangular plate, a fixed plate is fixedly connected to one side wall of the cover plate, and the fixed plate cooperates with the fixed blocks.

[0013] As a preferred scheme of the high-toughness polypropylene plastic particle preparation process, the fixed blocks are provided with a plurality of inclined surfaces, and the inclined surfaces cooperate with the fixed plate.

[0014] As a preferred scheme of the high-toughness polypropylene plastic particle preparation process, the operation table is provided with a refrigeration device, and the infusion tube passes through the refrigeration device.

[0015] The beneficial effects of the present application are as follows: 1. In use, the processed strip-shaped polyethylene plastic is placed on the feeding platform through the conveying rollers, the motor is started, the two conveying rollers are driven to rotate, the material is transported, the conveying rollers drive the driving transmission wheel to rotate, the first driven transmission wheel is rotated, the cutting roller is rotated, the material is cut by the cutting blade, the operation is simple and convenient, and the working efficiency is improved.

[0016] 2. Meanwhile, the first driven transmission wheel rotates, the second driven transmission wheel is driven to rotate, the rotating roller rotates, the elastic telescopic rod makes circular motion, the elastic telescopic rod contacts the material guide channel and shrinks, at the same time, the material guide channel is knocked to vibrate, so that the material is prevented from adhering, and the smooth feeding of the material is ensured.

[0017] 3. The rotation of the cutting roller drives the round rod to rotate, the rectangular plate rotates, the abutting block makes circular motion, when the abutting block contacts the fixed plate, the round rod can be extruded, the sealing piston plate is driven to move, at the same time, reciprocating motion is made under the action of the spring, the cooling liquid is extruded to circulate, the cutting blade is cooled, the high temperature of the cutting blade caused by continuous cutting is avoided, and the subsequent processing quality is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor. Among them: Figure 1 A flow chart of a high-toughness polypropylene plastic particle preparation process is provided for the present application Figure 2 A front overall structure schematic diagram of a plastic cutting machine is provided for the high-toughness polypropylene plastic particle preparation process of the present application. Figure 3 A rear view of Figure 2 ; Figure 4 A partial cross-sectional structure schematic diagram of Figure 3 ; Figure 5 A partial cross-sectional structure schematic diagram of Figure 4 ; Figure 6 A partial cross-sectional structure schematic diagram of Figure 5 ; Figure 7 An enlarged structure schematic diagram of A in Figure 4 .

[0019] In the figure: 100, main unit; 101, operation table; 102, cover plate; 103, rectangular opening; 104, material guiding channel; 200, pelletizing unit; 201, conveying roller; 202, material conveying platform; 203, pelletizing roller; 204, pelletizing blade; 205, gear; 206, knocking assembly; 206a, rotating roller; 206b, annular plate; 206c, elastic telescopic rod; 207, motor; 208, transmission assembly; 208a, first driven transmission wheel; 208b, driving transmission wheel; 208c, second driven transmission wheel; 208d, transmission belt; 300, cooling unit; 301, liquid conveying pipe; 302, refrigeration device; 303, first cavity; 304, liquid conveying channel; 305, arc-shaped opening; 306, annular sleeve; 307, movable assembly; 307a, sealing piston plate; 307b, round rod; 307c, spring; 307d, fixed plate; 307e, rectangular plate; 307f, abutting block. DETAILED DESCRIPTION

[0020] In order to make the above objectives, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0021] In the following description, a large number of specific details are set forth in order to facilitate a thorough understanding of the present application, but the present application can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without departing from the concept of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0022] Secondly, "one embodiment" or "embodiment" referred to herein means that a specific feature, structure or characteristic can be included in at least one implementation of the present application. "In one embodiment" appearing in different places in the specification does not mean the same embodiment, nor is it an embodiment that is independent or alternative to other embodiments.

[0023] Thirdly, the present application is described in detail in conjunction with the schematic diagram, and in the detailed description of the embodiments of the present application, the cross-sectional view of the device structure is partially enlarged without the general proportion for the convenience of description, and the schematic diagram is only an example, which should not limit the scope of protection of the present application herein. In addition, three-dimensional spatial dimensions including length, width and depth should be included in actual manufacture.

[0024] Reference Figures 1-7 The present application provides a high-toughness polyethylene plastic particle preparation process, which uses a plastic pelletizer, the plastic pelletizer includes a main unit 100, a pelletizing unit 200 and a cooling unit 300, and the specific process when the above-mentioned plastic pelletizer is used includes the following: S1, the following raw materials are taken by mass fraction: homopolymer polypropylene 100 parts, ethylene-octene copolymer 10-25 parts, ethylene-propylene rubber 5-15 parts, compatibilizer 2-5 parts, nucleating agent 0.2-0.5 parts, antioxidant 0.2-0.5 parts, optional light stabilizer 0.1-0.3 parts and slip agent 0.1-0.3 parts; S2, the polypropylene base material, ethylene-octene copolymer, ethylene-propylene rubber and compatibilizer are added to a high-speed mixer and mixed at a speed of 1000-1500 rpm for 5-8 minutes; then the antioxidant, nucleating agent and slip agent are added and mixed for another 3-5 minutes, and then dried at 80-100°C under vacuum for 2-3 hours to remove moisture and volatile matter; S3, the dried mixture is sent to a twin-screw extruder for melt blending, the temperature of each zone of the extruder is 170-180°C for the feeding section, 180-200°C for the compression section, 200-210°C for the melting section, 210-220°C for the homogenization section and 220-230°C for the die head, and the screw speed is controlled at 150-300 rpm to make the rubber phase fully dispersed and form a uniform microstructure; S4, during the blending process, a negative pressure of-0.08 to-0.09 MPa is maintained at the vacuum exhaust port to remove volatile matter and residual moisture, the melt is extruded through the die head and cooled into a strip-shaped material, which is cooled to 25-35°C in a water tank and cut into particles with a length of 3-5 mm by a plastic pelletizer; S5, after centrifugal dewatering, the particles are hot air dried at 70-80°C for 1-2 hours to obtain high-toughness polypropylene plastic particles; The main unit 100 comprises an operation table 101, a cover plate 102 is fixedly connected to the operation table 101, a rectangular opening 103 is formed in the operation table 101, and a material guiding channel 104 is fixedly connected to the operation table 101; The pelletizing unit 200 comprises two conveying rollers 201, the two conveying rollers 201 are symmetrically rotatable and inserted through the cover plate 102, a pelletizing roller 203 is rotatably inserted through the cover plate 102, a plurality of pelletizing blades 204 are fixedly connected to the pelletizing roller 203, a gear 205 is fixedly connected to the conveying roller 201, the two gears 205 are engaged with each other, a knocking assembly 206 for knocking the material guiding channel 104 is arranged in the operation table 101, one end of the lower conveying roller 201 is fixedly connected to a motor 207, and a transmission assembly 208 is arranged between the conveying roller 201, the pelletizing roller 203 and the knocking assembly 206; The cooling unit 300 comprises a liquid feeding pipe 301 fixedly connected to the cutting roller 203, the cutting roller 203 is symmetrically provided with a first cavity 303 and a second cavity, the cutting roller 203 and the cutting blade 204 are jointly provided with a liquid feeding channel 304, the liquid feeding channel 304 is communicated with the first cavity 303 and the second cavity, one end of the cutting roller 203 is provided with a movable assembly 307, the liquid feeding pipe 301, the first cavity 303, the second cavity and the liquid feeding channel 304 are filled with cooling liquid.

[0025] The inner wall of the cover plate 102 is fixedly connected with a material feeding platform 202, the material feeding platform 202 cooperates with the two conveying rollers 201, the material feeding platform 202 is fixedly connected with a cover plate, and the plastic strip transported to one side by the conveying roller 201 passes below the cover plate to be cut into particles, so that the stability during cutting is ensured.

[0026] Further, the knocking assembly 206 comprises a rotating roller 206a rotatably connected to the inner wall of the operation table 101, a plurality of annular plates 206b are fixedly connected to the rotating roller 206a, and elastic telescopic rods 206c are fixedly connected to the annular plates 206b. The elastic telescopic rods 206c cooperate with the material guide channel 104, so that when the rotating roller 206a rotates, the elastic telescopic rods 206c can be driven to move in a circular motion. The elastic telescopic rods 206c are in contact with the material guide channel 104 to contract and knock the material guide channel 104 to vibrate, so that the material is prevented from adhering.

[0027] Further, the transmission assembly 208 comprises a driving transmission wheel 208b, a first driven transmission wheel 208a and a second driven transmission wheel 208c. The driving transmission wheel 208b is fixedly connected to one end of the upper conveying roller 201, the first driven transmission wheel 208a is fixedly connected to the cutting roller 203, and the second driven transmission wheel 208c is fixedly connected to the rotating roller 206a. Transmission belts 208d are arranged between the driving transmission wheel 208b and the first driven transmission wheel 208a and between the first driven transmission wheel 208a and the second driven transmission wheel 208c. The driving transmission wheel 208b is driven to rotate by the rotation of the upper conveying roller 201, the first driven transmission wheel 208a is driven to rotate by the transmission belt 208d, the cutting roller 203 is driven to rotate, the second driven transmission wheel 208c is driven to rotate by the transmission belt 208d, and the rotating roller 206a is driven to rotate.

[0028] Further, an annular sleeve 306 is rotatably connected to one end of the cutting roller 203, a plurality of arc-shaped openings 305 are formed in one end of the cutting roller 203, one end of the liquid feeding pipe 301 is fixedly connected to the annular sleeve 306, and the liquid feeding pipe 301 is communicated with the inside of the first cavity 303 through the arc-shaped openings 305. The cooling liquid can flow from one end of the cutting roller 203 to the other end for recycling, so as to accelerate the cooling effect of the cutting blade 204.

[0029] Further, the movable assembly 307 comprises a sealing piston plate 307a which is slidingly connected to the inner side wall of the first cavity 303, and a round rod 307b is fixedly connected to the sealing piston plate 307a and slidingly penetrates the cutting roller 203, so that the sealing piston plate 307a can move left and right to extrude the cooling liquid and drive the circulation of the cooling liquid to accelerate the cooling of the cutting blade 204.

[0030] Further, the movable assembly 307 further comprises a spring 307c which is fixedly connected between the sealing piston plate 307a and the inner side wall of the first cavity 303, and the spring 307c is made of stainless steel, so that the sealing piston plate 307a can be reset to move left and right to pressurize the cooling liquid after being stressed.

[0031] Further, the round rods 307b are fixedly connected with a rectangular plate 307e, and the rectangular plate 307e is symmetrically fixedly connected with a resisting block 307f, and a fixed plate 307d is fixedly connected to one side wall of the cover plate 102, and the fixed plate 307d cooperates with the resisting block 307f, when the round rods 307b rotate with the cutting roller 203, the rectangular plate 307e can be driven to rotate, so that the resisting block 307f makes a circular motion, and when the resisting block 307f contacts with the fixed plate 307d, the round rods 307b can be extruded to drive the sealing piston plate 307a to move.

[0032] Further, the resisting block 307f is provided with a plurality of inclined surfaces which cooperate with the fixed plate 307d to extrude the resisting block 307f when the resisting block 307f contacts with the fixed plate 307d, so as to drive the round rods 307b to move.

[0033] Further, the operating table 101 is provided with a refrigeration device 302, and the infusion tube 301 penetrates the refrigeration device 302, so that the cooling liquid flowing through the refrigeration device 302 can be cooled by the refrigeration device 302.

[0034] In use, the finished polyethylene plastic strip is placed on the conveying platform 202 through the conveying roller 201, the motor 207 is started, the two conveying rollers 201 are driven to rotate, the material is transported, the conveying roller 201 drives the driving wheel 208b to rotate, the first driven wheel 208a is driven to rotate, the cutting roller 203 is driven to rotate, and the material is cut by the cutting blade 204; at the same time, the first driven wheel 208a drives the second driven wheel 208c to rotate, the rotating roller 206a is driven to rotate, the elastic telescopic rod 206c is driven to rotate, the elastic telescopic rod 206c is in contact with the material guide channel 104 and is contracted, at the same time, the material guide channel 104 is knocked and vibrated, the material is prevented from adhering, and the material is ensured to be smoothly discharged; the rotation of the cutting roller 203 drives the round rod 307b to rotate, the rectangular plate 307e is driven to rotate, the abutting block 307f is driven to rotate, when the abutting block 307f is in contact with the fixed plate 307d, the round rod 307b can be extruded, the sealing piston plate 307a is driven to move, at the same time, the sealing piston plate 307a is driven to reciprocate under the action of the spring 307c, the cooling liquid is extruded to circulate, the cutting blade 204 is cooled, the high temperature of the cutting blade 204 caused by continuous cutting is avoided, and the subsequent processing quality is ensured.

[0035] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not limited. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present application, and they should be covered in the scope of the claims of the present application.

Claims

1. A process for preparing high-toughness polypropylene plastic granules, which uses a plastic pelletizer comprising a main unit (100), a pelletizing unit (200), and a cooling unit (300), characterized in that: The specific process for using the aforementioned plastic pelletizer includes the following: S1. Weigh the following raw materials according to the following mass percentages: 100 parts homopolymer polypropylene, 10-25 parts ethylene-octene copolymer, 5-15 parts ethylene-propylene rubber, 2-5 parts compatibilizer, 0.2-0.5 parts nucleating agent, 0.2-0.5 parts antioxidant, 0.1-0.3 parts optional light stabilizer, and 0.1-0.3 parts slip agent; S2. Add the polypropylene base material, ethylene-octene copolymer, ethylene-propylene rubber and compatibilizer to a high-speed mixer and mix at 1000-1500 rpm for 5-8 minutes; then add antioxidant, nucleating agent and slip agent and continue mixing for 3-5 minutes, and then dry under vacuum at 80-100°C for 2-3 hours to remove moisture and volatiles. S3. The dried mixture is fed into a twin-screw extruder for melt blending. The temperatures of each zone of the extruder are as follows: feeding zone 170-180℃, compression zone 180-200℃, melting zone 200-210℃, homogenization zone 210-220℃, and die head 220-230℃. The screw speed is controlled at 150-300 rpm to ensure that the rubber phase is fully dispersed and forms a uniform microphase structure. S4. During the blending process, a negative pressure of -0.08 to -0.09 MPa is maintained at the vacuum exhaust port to remove volatiles and residual moisture. The melt is extruded through the die head and cooled into strip-shaped material. It is then cooled to 25 to 35°C in a water tank and cut into granules with a length of 3 to 5 mm by a plastic pelletizer. S5. After centrifugation and dehydration, the granules are dried with hot air at 70-80°C for 1-2 hours to obtain high-toughness polypropylene plastic granules. The main unit (100) includes an operating table (101), a cover plate (102) is fixedly connected to the operating table (101), a rectangular opening (103) is opened on the operating table (101), and a material guide channel (104) is fixedly connected to the operating table (101). The pelletizing unit (200) includes two conveying rollers (201), which are symmetrically rotated and inserted on a cover plate (102). A pelletizing roller (203) is rotatably inserted on the cover plate (102). Multiple pelletizing blades (204) are fixedly connected to the pelletizing roller (203). Gears (205) are fixedly connected to the conveying roller (201). Two gears (205) mesh with each other. A striking component (206) for striking the guide channel (104) is provided in the operating table (101). A motor (207) is fixedly connected to one end of the lower conveying roller (201). A transmission component (208) is provided between the conveying roller (201), the pelletizing roller (203) and the striking component (206). The cooling unit (300) includes an infusion pipe (301) which is fixedly connected to the pelletizing roller (203). The pelletizing roller (203) has a first cavity (303) and a second cavity symmetrically arranged on it. The pelletizing roller (203) and the pelletizing blade (204) are provided with an infusion channel (304). The infusion channel (304) is connected to the first cavity (303) and the second cavity. One end of the pelletizing roller (203) is provided with a movable component (307). The infusion pipe (301), the first cavity (303), the second cavity and the infusion channel (304) are filled with coolant.

2. The process for preparing high-toughness polypropylene plastic granules according to claim 1, characterized in that: A material conveying platform (202) is fixedly connected to the inner wall of the cover plate (102). The material conveying platform (202) cooperates with two conveying rollers (201). A cover plate is fixedly connected to the material conveying platform (202).

3. The process for preparing high-toughness polypropylene plastic granules according to claim 2, characterized in that: The striking assembly (206) includes a rotating roller (206a) which is rotatably connected to the inner wall of the operating table (101). Multiple annular plates (206b) are fixedly connected to the rotating roller (206a), and elastic telescopic rods (206c) are fixedly connected to the annular plates (206b). The elastic telescopic rods (206c) cooperate with the material guide channel (104).

4. The process for preparing high-toughness polypropylene plastic granules according to claim 3, characterized in that: The transmission assembly (208) includes a drive drive wheel (208b), a first driven drive wheel (208a), and a second driven drive wheel (208c). The drive drive wheel (208b) is fixedly connected to one end of the upper conveying roller (201). The first driven drive wheel (208a) is fixedly connected to the pelletizing roller (203). The second driven drive wheel (208c) is fixedly connected to the rotating roller (206a). A transmission belt (208d) is provided between the drive drive wheel (208b) and the first driven drive wheel (208a), and between the first driven drive wheel (208a) and the second driven drive wheel (208c).

5. The process for preparing high-toughness polypropylene plastic granules according to claim 4, characterized in that: An annular sleeve (306) is rotatably connected to one end of the pelletizing roller (203), and multiple arc-shaped openings (305) are provided on one end of the pelletizing roller (203). One end of the infusion tube (301) is fixedly connected to the annular sleeve (306), and the infusion tube (301) is connected to the inside of the first cavity (303) through the arc-shaped openings (305).

6. The process for preparing high-toughness polypropylene plastic granules according to claim 5, characterized in that: The active component (307) includes a sealing piston plate (307a) which is slidably connected to the inner wall of the first cavity (303). A round rod (307b) is fixedly connected to the sealing piston plate (307a) and slides through the pelletizing roller (203).

7. The process for preparing high-toughness polypropylene plastic granules according to claim 6, characterized in that: The active component (307) also includes a spring (307c), which is fixedly connected between the sealing piston plate (307a) and the inner wall of the first cavity (303), and the spring (307c) is made of stainless steel.

8. The process for preparing high-toughness polypropylene plastic granules according to claim 7, characterized in that: A rectangular plate (307e) is fixedly connected between the round rods (307b), and abutments (307f) are symmetrically fixedly connected on the rectangular plate (307e). A fixing plate (307d) is fixedly connected on one side wall of the cover plate (102), and the fixing plate (307d) cooperates with the abutments (307f).

9. The process for preparing high-toughness polypropylene plastic particles according to claim 8, characterized in that: The abutment (307f) has multiple inclined surfaces, which cooperate with the fixing plate (307d).

10. The process for preparing high-toughness polypropylene plastic particles according to claim 9, characterized in that: The operating table (101) is equipped with a refrigeration device (302), and the infusion tube (301) passes through the refrigeration device (302).

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