A kind of whisker reinforced polypropylene (PP) material pelletizing equipment and pelletizing method

Abstract

The application belongs to the technical field of whisker material reinforced polypropylene (PP) preparation, and particularly provides a whisker reinforced polypropylene (PP) material granulation device and a granulation method. The granulation method comprises the following steps: S1, mixing materials and extrusion molding: polypropylene raw materials are mixed with whisker materials for reinforcement; S2, the polypropylene mixed rod enters a cooling device, and is completely cooled by a circulating water tank in the cooling device to obtain a hard polypropylene mixed rod; S3, the hard polypropylene mixed rod obtained by cooling in step S2 enters a granulation device, the granulation device drives a cutter to act by an electric cylinder to cut and granulate the polypropylene mixed rod, and the polypropylene mixed rod falls into a preparation cabin; and S4, surface treatment. The polypropylene is reinforced by whisker materials, so that the strength of the polypropylene material is improved, wherein the strength of the whisker is much higher than that of other short-cut fibers, the whisker is used as a reinforcing body of the polypropylene composite material, and high-strength polypropylene composite material can be manufactured.

Description

Technical Field

[0001] This invention relates to the technical field of polypropylene (PP) whisker material reinforcement, and particularly to a granulation device and granulation method for whisker-reinforced polypropylene (PP) materials. Background Technology

[0002] Whiskers are fibers that form naturally or grow as single crystals under artificially controlled conditions (primarily). They have extremely small diameters (on the order of micrometers), do not contain defects found in typical materials (grain boundaries, dislocations, vacancies, etc.), and their atoms are highly ordered, resulting in strength close to the theoretical value of a perfect crystal. Their mechanical strength is equal to the interatomic force. The highly oriented structure of whiskers not only gives them high strength, high modulus, and high elongation, but also electrical, optical, magnetic, dielectric, conductive, and superconducting properties. Whiskers are much stronger than other chopped fibers and are mainly used as reinforcements in composite materials for manufacturing high-strength composites. Polypropylene is a thermoplastic resin obtained by polymerizing propylene. Based on the arrangement of methyl groups, it is classified into isotactic polypropylene, atactic polypropylene, and syndiotactic polypropylene. Polypropylene is a non-toxic, odorless, and tasteless milky-white, highly crystalline polymer. It is one of the lightest types of plastics currently available. For example, PP material sheets can be reinforced with whisker materials. During the preparation of polypropylene materials, additives need to be mixed in to change their original properties. After the materials are mixed in, their internal structure will also change. In particular, when cutting and granulating the molded rod-shaped polypropylene PP material with a cutter, the cutting speed of the cutter often cannot be synchronized with the feed speed of the polypropylene whisker reinforcement material, resulting in inconsistent granule size of the polypropylene reinforcement material, which affects product quality. Summary of the Invention

[0003] Therefore, it is necessary to provide a granulation device and granulation method for whisker-reinforced polypropylene (PP) materials to solve at least one of the above-mentioned technical problems.

[0004] This invention provides a granulation method for whisker-reinforced polypropylene (PP) material, the granulation method comprising the following steps:

[0005] Step S1: Mixing and extruding the materials: Polypropylene raw materials are mixed with whisker materials for reinforcement. The mixed materials are fed into the mixing and molding device. The materials are mixed by the agitation of the twin screw of the extruder in the mixing and molding device. During the mixing process, the mixed materials are heated by the twin screw and become semi-fluid. Then, they are discharged from the forming hole of the die head to obtain strip-shaped polypropylene mixed strips.

[0006] Step S2: Cooling treatment: The polypropylene blend bar enters the cooling device and is thoroughly cooled by the circulating water tank in the cooling device to obtain a rigid polypropylene blend bar.

[0007] Step S3: Cutting and granulation: The rigid polypropylene mixed rod obtained by cooling in step S enters the granulation device. The granulation device drives the cutter to cut and granulate the polypropylene mixed rod through an electric cylinder, and the granules fall into the preparation chamber.

[0008] Step S4: Surface treatment: Granular polypropylene material falls into the collection seat along the preparation chamber. After being fully polished by the abrasive mechanism in the collection seat, the defects at the cut surface when the polypropylene material is cut are cleaned up, and finally these polypropylene material particles are discharged out of the outlet between the collection seat and the grinding chamber in sequence.

[0009] Step S5: Collect abrasive for reuse: A container is set outside the discharge port to collect not only the polypropylene material particles, but also the dust that falls off during grinding. The dust is then recycled back into the mixing and molding device for reuse in granulation and reprocessing.

[0010] The polypropylene (PP) of this invention is reinforced with whisker material, wherein the mechanical strength of the whisker material is equal to the interatomic force. The highly oriented structure of the whiskers not only endows them with high strength, high modulus, and high elongation, but also with electrical, optical, magnetic, dielectric, conductive, and superconducting properties. The strength of the whiskers is far higher than that of other chopped fibers, making them suitable as reinforcements for polypropylene composites, enabling the manufacture of high-strength polypropylene composites. Furthermore, the continuous conveying of the grinding belt causes the polypropylene particles fed into the grinding gap to be ground while being fed in the discharge direction, thus removing burrs and other defects at the cut edges of these polypropylene particles. Utilizing the grinding action of the grinding belt not only grinds the polypropylene particles but also improves product quality.

[0011] The present invention also provides a granulation device for whisker-reinforced polypropylene (PP) material, including a preparation chamber, a granulation device connected to the feed end of the preparation chamber, and a mixing and molding device connected to the feed end of the granulation device. The discharge end of the preparation chamber is provided with a material collection seat, the material collection seat is provided with a flying material mechanism, and the side of the material collection seat is provided with an abrasive mechanism. The flying material mechanism includes a flying disc that is rotated in the material collection seat through a rotating shaft and bearings, and several flying discs fixed on the flying disc.

[0012] The abrasive mechanism includes a grinding chamber and a grinding assembly disposed within the grinding chamber. A discharge port is provided between the material collection seat and the grinding chamber. The second pulley is located near the discharge port. Grinding textures are provided on the inner wall of the grinding chamber on the same side as the discharge port. One end of the grinding chamber is fixed to the side of the material collection seat, and the inner cavity of the grinding chamber communicates with the inner cavity of the material collection seat. The other end of the grinding chamber extends obliquely upwards towards the material collection seat. The grinding assembly includes components rotatably connected to one end of the inner cavity of the grinding chamber via a rotating shaft and bearings. The system includes a first pulley, a second pulley that is connected to the other end of the grinding chamber cavity, and a grinding belt that is connected between the first pulley and the second pulley. The second pulley is close to the swivel blade, so that one end of the grinding belt is close to the swivel blade, one side of the grinding belt is close to the grinding texture, and a grinding gap is left between the grinding belt and the grinding texture. A feeding channel is provided between the other side of the grinding belt and the inner wall of the grinding chamber on the other side. The end of the feeding channel close to the second pulley faces the swivel blade.

[0013] A motor is fixed to the rear of the collection base. One end of the motor inside the collection base is connected to the fly disc, and the other end of the motor outside the collection base is connected to the first pulley via belt drive.

[0014] In one implementation, the swivel blade is inclined toward the direction of the feed channel.

[0015] In one embodiment, a receiving plate that bends toward the direction of the second pulley is connected to the discharge port.

[0016] In one embodiment, the receiving plate is an arc-shaped curved plate, with one end of the receiving plate curving upwards toward the second pulley and the other end of the receiving plate curving upwards toward the slinger, so that the middle part of the receiving plate bends downwards toward the preparation chamber, and the receiving plate separates the discharge port from the inner cavity of the collecting seat.

[0017] In one embodiment, the preparation chamber is vertically connected to the top of the collection seat, and the bottom of the preparation chamber is connected to the collection seat. A guide plate is provided inside the preparation chamber. One end of the guide plate is inclined upward and connected to the inner cavity side wall of the preparation chamber, and the other end of the guide plate is inclined downward and close to the receiving plate. A corner is formed between the grinding chamber and the preparation chamber. The end of the guide plate close to the receiving plate passes through the corner. A feed port is formed between the guide plate and the corner. An emission port is formed between the guide plate and the receiving plate, open on the outside of the two blades. The emission port is connected to the feed channel.

[0018] In one embodiment, the feed channel is an inclined channel that gradually narrows from one end connected to the discharge port to the other end.

[0019] In one embodiment, the polishing belt and the polishing texture are parallel to each other, and the outer end of the discharge port is provided with a discharge pipe that is inclined downwards, and the bottom of the inner end of the discharge pipe is connected to the receiving plate.

[0020] In one embodiment, a cooling device is provided between the mixing and forming device and the granulation device. The mixing and forming device is an extruder, and the cooling device is a water tank with an external circulating pump and internal cooling water. The granulation device consists of a material chamber and an electric cylinder mounted on the material chamber. A cutter is mounted on the actuating rod of the electric cylinder and is located inside the material chamber. The discharge port of the mixing and forming device is connected to the inlet of the cooling device, and the discharge port of the cooling device is connected to the inlet of the material chamber on the granulation device.

[0021] Beneficial effects: A material collection seat is installed at the bottom of the preparation chamber, and a flying material mechanism and an abrasive mechanism are installed inside the material collection seat. Polypropylene particles fall onto the flying material mechanism's blades along the material cavity of the preparation chamber. The rotating motion of the blades propels these polypropylene particles into the grinding chamber. Some particles fall into the feed channel on the right side of the grinding belt and come into contact with the right side of the grinding belt. As the grinding belt rotates counterclockwise, it sends the polypropylene particles into the grinding gap between the left side of the grinding belt and the grinding texture. Due to the continuous conveying of the grinding belt, the particles are effectively ground. The polypropylene granules fed into the grinding gap are ground as they are fed towards the outlet. This process removes burrs and other defects from the cut edges of the granules. The grinding gap is a long, narrow structure, so the continuous conveying of the grinding belt allows the polypropylene granules to be ground as they are fed towards the outlet. This process removes burrs and other defects from the cut edges of the granules. By utilizing the grinding action of the grinding belt, the polypropylene granules are not only ground, but the product quality is also improved. Attached Figure Description

[0022] Figure 1 A schematic diagram of the main view of a granulation device for whisker-reinforced polypropylene (PP) material provided for an embodiment of the present invention.

[0023] Figure 2 The granulation equipment for whisker-reinforced polypropylene (PP) material provided in the embodiments of the present invention comprises: Figure 1 A schematic diagram of the resulting three-dimensional structure;

[0024] Figure 3 A top view schematic diagram of the granulation equipment for whisker-reinforced polypropylene (PP) material provided in an embodiment of the present invention.

[0025] Figure 4 The granulation equipment for whisker-reinforced polypropylene (PP) material provided in the embodiments of the present invention comprises: Figure 3 A schematic diagram of the front view structure after sectioning A.

[0026] Figure 5 A schematic diagram of the rear structure of a granulation device for whisker-reinforced polypropylene (PP) material provided in an embodiment of the present invention.

[0027] In the diagram: 1. Preparation chamber; 2. Granulation device; 3. Mixing and molding device; 4. Collection seat; 5. Flying material mechanism; 51. Flying disc; 52. Throwing disc; 6. Abrasive mechanism; 61. Grinding chamber; 611. Grinding texture; 62. Grinding assembly; 621. First pulley; 622. Second pulley; 623. Grinding belt; 7. Discharge port; 71. Discharge pipe; 8. Feeding channel; 9. Receiving plate; 10. Guide plate; 11. Corner; 12. Passing port; 13. Launching port; 14. Cooling device. Detailed Implementation

[0028] The above and other embodiments and advantages of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0029] In one implementation, such as Figure 1-5 As shown, the granulation equipment for whisker-reinforced polypropylene (PP) material provided in this embodiment includes a preparation chamber 1, a granulation device 2 connected to the feed end of the preparation chamber 1, and a mixing and molding device 3 connected to the feed end of the granulation device 2. The discharge end of the preparation chamber 1 is provided with a material collection seat 4, a flying material mechanism 5 is provided in the material collection seat 4, and an abrasive mechanism 6 is provided on the side of the material collection seat 4. The flying material mechanism 5 includes a flying disc 51 that is rotated in the material collection seat 4 through a rotating shaft and bearings, and a plurality of flying discs 52 fixed on the flying disc 51.

[0030] The abrasive mechanism 6 includes a grinding chamber 61 and a grinding component 62 disposed within the grinding chamber 61. One end of the grinding chamber 61 is fixed to the side of the collecting seat 4. A discharge port 7 is provided between the collecting seat 4 and the grinding chamber 61. A second pulley 622 is close to the discharge port 7. A grinding texture 611 is provided on the inner wall of the grinding chamber 61 on the same side as the discharge port 7. The inner cavity of the grinding chamber 61 communicates with the inner cavity of the collecting seat 4. The other end of the grinding chamber 61 extends obliquely upward toward the collecting seat 4. The grinding component 62 includes components that are rotatably connected to the grinding chamber 61 via a rotating shaft and bearings. The first pulley 621 at one end of the cavity, the second pulley 622 at the other end of the inner cavity of the grinding chamber 61, and the grinding belt 623 connected between the first pulley 621 and the second pulley 622 are connected. The second pulley 622 is close to the swivel blade 52, so that one end of the grinding belt 623 is close to the swivel blade 52, one side of the grinding belt 623 is close to the grinding texture 611, and a grinding gap is left between the grinding belt 623 and the grinding texture 611. A feeding channel 8 is provided between the other side of the grinding belt 623 and the inner wall of the other side of the grinding chamber 61. The end of the feeding channel 8 close to the second pulley 622 faces the swivel blade 52.

[0031] A motor is fixed at the rear of the material collection base 4. One end of the motor inside the material collection base 4 is connected to the fly disc 51, and the other end of the motor outside the material collection base 4 is connected to the first pulley 621 via belt drive.

[0032] In this embodiment, whisker material is added to the polypropylene raw material in a specific ratio, and then the mixture is fed into the mixing and molding device 3. The mixing and molding device 3 is powered on and uses a twin-screw extruder to crush the mixture. During the crushing process, the mixture is heated to a high temperature and becomes semi-fluid, propelling it towards the die head mold. Finally, it is extruded into a rod shape by the die head discharge end and enters the cooling device 14. After being cooled by the water tank in the cooling device 14, it enters the granulation device 2. After frequent cutting by the granulation device 2, polypropylene granules are obtained. Due to the mixing... Whisker material was incorporated, and according to the properties of whisker material, it improves the strength of polypropylene. After the polypropylene particles are cut, burrs or flash will appear at the cut edge. In order to further treat these defects, a collection seat 4 is set at the bottom of the preparation chamber 1. The polypropylene particles fall into the collection seat 4 along the material cavity of the preparation chamber 1 and land on the throwing blade 52 of the throwing mechanism 5. The flying disc 51 rotates with the throwing blade 52, and the rotation of the throwing blade 52 is used to throw these polypropylene particles into the grinding chamber 61. Some particles will land on the grinding belt 623 (e.g., Figure 4The polypropylene granules are fed into the feed channel 8 on the right side (as shown) and will contact the right side of the grinding belt 623. As the grinding belt 623 rotates counterclockwise, it feeds the polypropylene granules into the grinding gap between the left side of the grinding belt 623 and the grinding texture 611. Due to the continuous conveying of the grinding belt 623, the polypropylene granules fed into the grinding gap are ground while being fed towards the discharge port 7. This process removes the burrs and defects at the cut edges of the polypropylene granules. The grinding action of the grinding belt 623 not only grinds the polypropylene granules and improves the product quality, but also carries the polypropylene granules to the discharge port 7 for sequential discharge.

[0033] like Figure 4 As shown, in another embodiment, the preparation chamber 1 is vertically connected to the top of the collection seat 4, and the bottom of the preparation chamber 1 is connected to the collection seat 4. A guide plate 10 is provided inside the preparation chamber 1. One end of the guide plate 10 is inclined upward and connected to the inner cavity side wall of the preparation chamber 1. The other end of the guide plate 10 is inclined downward and close to the receiving plate 9. A corner 11 is formed between the grinding chamber 61 and the preparation chamber 1. The end of the guide plate 10 close to the receiving plate 9 passes through the corner 11. A feed port 12 is formed at the guide plate 10 and the corner 11. An emission port 13 is formed between the guide plate 10 and the receiving plate 9, which is open on the outside of the two slings 52. The emission port 13 is connected to the feed channel 8.

[0034] In this embodiment, before the polypropylene granules fall into the collecting seat 4, they first fall onto the guide plate 10. After being guided by the inclined guide plate 10, they fall onto the slings 52. As shown in the figure, the guide plate 10 will cover most of the slings 52, leaving only two slings 52 connected to the bottom of the feeding channel 8. This allows the polypropylene granules to fall onto the two slings 52 that have rotated to this position. Since the slings 52 are inclined towards the feeding channel 8, they will be centrifugally thrown into the feeding channel when they rotate at high speed. Within 8, and at the instant it is thrown into the feeding channel 8, it will fall down to the side of the grinding belt 623 corresponding to the feeding channel 8 due to its own gravity. As the grinding belt 623 rotates counterclockwise, it will be rolled and ground in the grinding gap between the left side of the grinding belt 623 and the grinding texture 611. Therefore, the setting of the guide plate 10 can enable the polypropylene particles to concentrate on falling onto one or two scrapers 52 in the feeding channel 8 at the moment of falling, thus achieving the purpose of concentrating the falling material onto one or two scrapers 52.

[0035] like Figure 4As shown, in this embodiment, a receiving plate 9 that bends toward the second pulley 622 is connected to the discharge port 7. The slinger 52 is close to the receiving plate 9 and is inclined toward the feed channel 8. The receiving plate 9 is an arc-shaped curved plate. One end of the receiving plate 9 is raised toward the second pulley 622, and the other end of the receiving plate 9 is raised toward the slinger 52, so that the middle part of the receiving plate 9 bends downward toward the preparation chamber 1. At the same time, the receiving plate 9 separates the discharge port 7 from the inner cavity of the collecting seat 4.

[0036] like Figure 4 As shown, in this embodiment, after being guided by the guide plate 10, a portion of the polypropylene granules from the preparation chamber 1 will fall directly onto the receiving plate 9. After being guided by the arc-shaped surface of the receiving plate 9, they will fall onto the rotating blade 52 that is close to it. At the same time, the setting of the receiving plate 9 can also prevent the polypropylene granules from being discharged directly from the outlet 7. Since the receiving plate 9 corresponds to the bottom end of the guide plate 10, the receiving plate 9 and the guide plate 10 together form the emission port 13, which assists the guide plate 10 in guiding the polypropylene granules onto the blade 52. At the same time, when the blade 52 rotates at high speed, the polypropylene granules are centrifugally thrown to ensure that they pass through the emission port 13 between the receiving plate 9 and the guide plate 10 and are thrown into the feed channel 8.

[0037] like Figure 4 As shown, in another embodiment, the feed channel 8 is an inclined channel that gradually narrows from one end to the other, which is connected to the emission port 13. This makes the opening of the feed channel 8 near the emission port 13 larger, ensuring that after the slinger 52 rotates to the emission port 13 to receive the material, it can throw the polypropylene granules from the large end opening of the feed channel 8 into the small end opening of the feed channel 8. At the same time, it also ensures that when the grinding belt 623 is conveyed counterclockwise from the large end opening to the small end opening, it compresses the polypropylene granules. Through the transmission action of the grinding belt 623, the polypropylene granules are rolled into the grinding gap between the other side of the grinding belt 623 and the grinding texture 611 for grinding.

[0038] like Figure 4 As shown, in another embodiment, the grinding belt 623 and the grinding texture 611 are parallel to each other, ensuring that the polypropylene particles rolled into the grinding gap are fed towards the discharge port 7 during the grinding process. Utilizing the parallel grinding gap between the grinding belt 623 and the grinding texture 611, the polypropylene particles rolled into the grinding gap are ground to a uniform size and then carried into the discharge port 7 by the continued transmission action of the grinding belt 623, and finally discharged out through the discharge pipe 71. This ensures that all polypropylene particles are ground within the same width of the grinding gap, ensuring uniform size and improving product quality. The grinding gap is elongated due to the position and shape constraints of the grinding belt 623 and the grinding texture 611, resulting in a longer grinding distance and better grinding effect.

[0039] The present invention also provides a granulation method for whisker-reinforced polypropylene (PP) material, the granulation method comprising the following steps:

[0040] Step S1: Mixing and extruding the materials: Polypropylene raw materials are mixed with whisker materials to improve strength. The mixed materials are fed into the mixing and molding device 3. The materials are mixed by the agitation of the twin screw of the extruder in the mixing and molding device 3. During the mixing process, the mixed materials are heated by the twin screw and become semi-fluid. Then, they are discharged from the forming hole of the die head to obtain strip-shaped polypropylene mixed strips.

[0041] Step S2: Cooling treatment: The polypropylene mixed strip enters the cooling device 14 and is thoroughly cooled by the circulating water tank in the cooling device 14 to obtain rigid polypropylene mixed rods.

[0042] Step S3: Cutting and granulation: The rigid polypropylene mixed rod obtained by cooling in step S2 enters the granulation device 2. The granulation device 2 drives the cutter to cut and granulate the polypropylene mixed rod through the electric cylinder and drop it into the preparation chamber 1.

[0043] Step S4: Surface treatment: Granular polypropylene material falls into the collection seat 4 along the preparation chamber 1. After being fully ground by the abrasive mechanism 6 in the collection seat 4, the defects at the cut of the polypropylene material are cleaned up, and finally these polypropylene material particles are discharged out of the outlet 7 between the collection seat 4 and the grinding chamber 61 in sequence.

[0044] Step S5: Collect abrasive for reuse: Set up a container outside the discharge port 7 to collect not only the polypropylene material particles, but also the dust that falls off during grinding. Then, the dust is recycled back into the mixing and molding device 3 for reuse in granulation and reprocessing.

[0045] Grinding Principle: After granulation, the polypropylene granules fall onto the guide plate 10 along the preparation chamber 1. After being guided by the rolling guide plate 10, part of them directly passes through the discharge port 13 and falls onto one or more slinger blades 52. Another part, to prevent it from falling directly onto the bottom surface of the collection seat 4, is blocked by the receiving plate 9 and also passes through the discharge port 13 and falls onto one or more slinger blades 52. While the slinger blades 52 rotate, the motor located at the rear of the preparation chamber 1 also drives the first pulley 621 to rotate via belt drive. The second pulley 622 then drives the second pulley 622 to rotate via the grinding belt 623. That is, at this time, the grinding belt 623 is conveying counterclockwise in the feed channel 8. When the slinger blades 52 rotate, they will centrifugally scatter the polypropylene granules falling on them. The polypropylene granules are sprayed from the discharge port 13 onto the grinding belt 623. They are then rolled into the grinding gap between the left side of the grinding belt 623 and the grinding texture 611. The grinding gap is long and narrow, which restricts the polypropylene granules to be ground and discharged towards the discharge port 7. Due to the long grinding gap, all polypropylene granules are ground within the same width of the gap, ensuring consistent size and improving product quality. At the same time, the polypropylene granules are also rolled as they are conveyed towards the discharge port 7 within the grinding gap by the grinding belt 623. During the rolling process, the burrs and flash at the cut edges are ground simultaneously, further improving product quality.

[0046] The specific embodiments described above further illustrate the inventive purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. In particular, it should be noted that any modifications, equivalent substitutions, or improvements made by those skilled in the art within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A pelletizing apparatus for whisker-reinforced polypropylene (PP) material, characterized in that, The application relates to a preparation cabin (1), a granulating device (2) connected to the feeding end of the preparation cabin (1), a mixing and forming device (3) connected to the feeding end of the granulating device (2), a material collecting seat (4) arranged at the discharging end of the preparation cabin (1), a flying material mechanism (5) arranged in the material collecting seat (4), a grinding material mechanism (6) arranged at the side of the material collecting seat (4), the flying material mechanism (5) comprising a flying disc (51) connected to the material collecting seat (4) through a rotating shaft and a bearing and a plurality of flapping pieces (52) fixed on the flying disc (51), the grinding material mechanism (6) comprising a grinding cabin (61) and a grinding assembly (62) arranged in the grinding cabin (61), a discharging port (7) arranged between the material collecting seat (4) and the grinding cabin (61), the grinding assembly (62) comprising a first belt pulley (621) connected to one end of the inner cavity of the grinding cabin (61) through a rotating shaft and a bearing, a second belt pulley (622) connected to the other end of the inner cavity of the grinding cabin (61), and a grinding belt (623) drivingly connected between the first belt pulley (621) and the second belt pulley (622), the second belt pulley (622) being close to the discharging port (7), a grinding texture (611) being arranged on the inner cavity wall of the grinding cabin (61) on the same side of the discharging port (7), one end of the grinding cabin (61) being fixed on the side of the material collecting seat (4), the inner cavity of the grinding cabin (61) being communicated with the inner cavity of the material collecting seat (4), the other end of the grinding cabin (61) extending towards the obliquely upward direction of the material collecting seat (4), the second belt pulley (622) being close to the flapping piece (52), one end of the grinding belt (623) being close to the flapping piece (52), one side of the grinding belt (623) being close to the grinding texture (611), a grinding gap being left between the grinding belt (623) and the grinding texture (611), the other side of the grinding belt (623) being provided with a feeding channel (8) between the inner cavity wall of the other side of the grinding cabin (61), one end of the feeding channel (8) close to the second belt pulley (622) facing the flapping piece (52), a motor being fixed on the rear part of the material collecting seat (4), one end of the motor in the material collecting seat (4) drivingly connected to the flying disc (51), and the other end of the motor outside the material collecting seat (4) drivingly connected to the first belt pulley (621) through a belt transmission mode.

2. The prilling apparatus of a whisker-reinforced polypropylene, PP, material according to claim 1, characterized in that, The flapping piece (52) is inclined towards the direction of the feeding channel (8).

3. The prilling apparatus of a whisker-reinforced polypropylene, PP, material according to claim 2, characterized in that, The discharging port (7) is connected with a material receiving plate (9) which is curved towards the direction of the second belt pulley (622), and the outer end of the flapping piece (52) is close to the material receiving plate (9).

4. The prilling apparatus of whisker-reinforced polypropylene (PP) material according to claim 3, characterized in that, The material receiving plate (9) is an arc-shaped bent plate, one end of the material receiving plate (9) is tilted towards the direction of the second belt wheel (622), the other end of the material receiving plate (9) is tilted towards the direction of the flapper (52), so that the middle part of the material receiving plate (9) is tilted downwards towards the direction of the preparation cabin (1), and the material outlet (7) and the inner cavity of the material collecting seat (4) are separated from each other through the material receiving plate (9).

5. The prilling apparatus of a whisker-reinforced polypropylene, PP, material according to claim 4, characterized in that, The preparation cabin (1) is vertically connected to the top end of the material collecting seat (4), the bottom end of the preparation cabin (1) is communicated with the material collecting seat (4), a guide plate (10) is arranged in the preparation cabin (1), one end of the guide plate (10) is tilted upwards and connected to the inner cavity side wall surface of the preparation cabin (1), the other end of the guide plate (10) is tilted downwards and close to the material receiving plate (9), an elbow (11) is formed between the grinding cabin (61) and the preparation cabin (1), the end of the guide plate (10) close to the material receiving plate (9) penetrates the elbow (11), the guide plate (10) and the elbow (11) are provided with a material passing opening (12), the guide plate (10) and the material receiving plate (9) form a launching opening (13) which is open on the outer side of the two flappers (52), and the launching opening (13) is communicated with the feeding channel (8).

6. The prilling apparatus of whisker-reinforced polypropylene (PP) material according to claim 5, characterized in that, The feeding channel (8) is an inclined channel which gradually narrows from one end to the other end communicated with the launching opening (13).

7. The prilling apparatus of whisker-reinforced polypropylene (PP) material according to claim 6, characterized in that, The polishing belt (623) is parallel to the polishing texture (611), the outer end of the material outlet (7) is provided with a downwardly inclined material outlet pipe (71), and the inner end bottom of the material outlet pipe (71) is connected to the material receiving plate (9).

8. The prilling apparatus of whisker-reinforced polypropylene (PP) material according to claim 7, characterized in that, The cooling device (14) is arranged between the mixing and forming device (3) and the granulating device (2), the mixing and forming device (3) is an extruder, the cooling device (14) is a water tank which is externally provided with a circulating pump and internally filled with cooling water, the granulating device (2) is composed of a material cabin and an electric cylinder arranged on the material cabin, a cutter is arranged on the action rod of the electric cylinder and located in the material cabin, the material outlet of the mixing and forming device (3) is connected with the material inlet of the cooling device (14), and the material outlet of the cooling device (14) is connected with the material inlet of the material cabin of the granulating device (2).

9. A method of pelletizing a whisker-reinforced polypropylene (PP) material, the method of pelletizing being adapted to a plant for pelletizing a whisker-reinforced polypropylene (PP) material as claimed in claim 8, characterized in that: The granulating method comprises the following steps: Step S1: mixing materials and extruding: polypropylene raw materials are mixed with whisker materials to improve strength, the mixed materials are put into the mixing and forming device (3), the materials are mixed by the double-screw stirring of the extruder in the mixing and forming device (3), the mixed materials are heated into semi-fluid state by the double screw in the mixing process, and then discharged from the forming hole of the die head, so as to obtain a polypropylene mixed strip in strip shape; Step S2: cooling treatment: the polypropylene mixed strip enters the cooling device (14), and is completely cooled by the circulating water tank in the cooling device (14), so as to obtain a hard polypropylene mixed rod; Step S3: Cutting and granulating: the hard polypropylene mixture rod obtained after cooling in step S2 is put into the granulating device (2), which is driven by an electric cylinder to make the cutter work to cut and granulate the polypropylene mixture rod, and then the rod falls into the preparation cabin (1); Step S4: Surface treatment: the granulated polypropylene material falls into the collecting seat (4) along the preparation cabin (1), and after being polished by the abrasive mechanism (6) in the collecting seat (4), the defects at the cutting edges of the polypropylene material are cleaned, and finally the polypropylene material particles are sequentially discharged from the discharge port (7) between the collecting seat (4) and the polishing cabin (61); Step S5: Collecting and reusing the abrasive: a container is arranged outside the discharge port (7) to collect not only the polypropylene material particles but also the dust falling off during polishing, and then the dust is recycled into the mixing and molding device (3) for reuse in the granulation production.

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