Raw material granulation equipment and method for plastic product injection molding

Abstract

The invention discloses raw material granulation equipment and method for plastic product injection molding, and relates to the field of plastic preparation devices. Raw material granulation equipment for plastic product injection molding comprises a conveying machine barrel, a discharging hopper is communicated with the conveying machine barrel, one end of the conveying machine barrel is communicated with a machine head, a cooling water tank is arranged below the machine head, a cutting machine shell is arranged at the other end of the cooling water tank, and a feeding port is formed in the cutting machine shell; a driving roller, a driven roller and a cutting roller are rotationally connected into the cutting machine shell. A rotating wheel is fixedly connected to the cutting roller, a sliding groove is formed in the rotating wheel, a sliding rod is slidably connected to the sliding groove, a moving rod is slidably connected to the cutting machine shell, and the moving rod is slidably connected with the sliding rod; a sliding frame is fixedly connected to the lower portion of the moving rod, and a screen is slidably connected to the sliding frame. A small amount of particles which are not cut off can be screened out, plastic particles which are connected together can be shaken away, and meanwhile the reciprocating motion amplitude of the movable frame can be changed.

Description

Technical Field

[0001] The present invention belongs to the technical field of plastic preparation devices, and specifically relates to a granulation device for raw materials used in plastic product injection molding. Background Art

[0002] Plastic is a polymer compound material with a wide range of applications and various properties. Due to its various physical properties, including specific gravity (density), water absorption, gas permeability, moisture permeability, transparency, tensile strength, compressive strength, flexural strength, impact strength, coefficient of friction, abrasion, hardness, etc., and its relatively low production and processing cost and strong plasticity, it has a wide range of applications in many fields such as daily life, industrial production, and engineering construction.

[0003] With the improvement of environmental awareness, the environmental performance of granulation devices for raw materials used in plastic product injection molding has also been increasingly concerned. Recycling and reusing waste plastic products have also become an important application field of plastic granulation devices, which helps to achieve the recycling of resources and sustainable development. The granulation device for raw materials used in plastic product injection molding plays a crucial role in the plastic industry. It can convert plastic raw materials into granular form for collection and reuse through a series of complex physical processes. However, in current existing devices, when cutting the remolded plastic strips after melting, various reasons often cause incomplete cutting or adhesion between particles after cutting. In the absence of screening, the quality of the produced plastic particles is uneven in the end, which will not only increase the production cost of manufacturers, but also reduce the industry competitiveness of manufacturers. Based on this, the present invention is proposed. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a granulation device for raw materials used in plastic product injection molding that can overcome the above problems or at least partially solve the above problems.

[0005] To solve the above technical problems, the basic concept of the technical solution adopted by the present invention is: a raw material granulation device for plastic product injection molding, including a conveyor barrel, a feeding hopper is connected to the conveyor barrel, one end of the conveyor barrel is connected to a machine head, and a cooling water tank is arranged below the machine head. It further includes: a cutting machine shell is arranged at the other end of the cooling water tank, a feeding port is opened on the cutting machine shell, and a driving roller, a driven roller and a cutting roller are respectively rotatably connected in the cutting machine shell; a rotating wheel is fixedly connected to the cutting roller, a sliding groove is opened on the rotating wheel, a sliding rod is slidably connected to the sliding groove, a moving rod is slidably connected to the cutting machine shell, and the moving rod is slidably connected to the sliding rod; a sliding frame is fixedly connected below the moving rod, and a sieve mesh is slidably connected to the sliding frame; when the rotating wheel rotates, the sliding rod drives the moving rod and the sliding frame to reciprocate to screen the plastic on the sieve mesh. When the sliding rod slides in the sliding groove, the amplitude of the reciprocating motion of the sliding frame changes following the sliding rod.

[0006] Preferably, a servo motor is fixedly connected to the cutting machine shell, the output end of the servo motor is fixedly connected to the cutting roller, a first driving pulley is fixedly connected to the cutting roller, a first driven pulley is fixedly connected to the driving roller, and a first conveyor belt is connected between the first driving pulley and the first driven pulley.

[0007] Preferably, a driving gear is fixedly connected to the driving roller, a driven gear is fixedly connected to the driven roller, the driven gear meshes with the driving gear, a rotating shaft is rotatably connected to the cutting machine shell, a second driven pulley is fixedly connected to the rotating shaft, a second driving pulley is fixedly connected to the driven roller, and a second conveyor belt is connected between the second driving pulley and the second driven pulley.

[0008] Further, a support block is fixedly connected to the cutting machine shell, the support block is rotatably connected to the rotating shaft, a driving bevel gear is fixedly connected to the rotating shaft, a fan is fixedly connected to the support block, a fan blade on the fan is fixedly connected to a driven bevel gear through a rotating shaft, and the driven bevel gear meshes with the driving bevel gear.

[0009] Further, a transition cavity is fixedly connected to the cutting machine shell, the transition cavity is located between the fan and the sliding frame, a discharge hopper is opened on the cutting machine shell, a partition is fixedly connected to the discharge hopper. When the screened plastic particles fall from the transition cavity to the discharge hopper, plastic particles with different masses fall to different positions of the discharge hopper under the influence of the fan.

[0010] Preferably, a circular slide rail is fixedly connected to the cutting machine shell, the center of the slide rail is the same as the center of the rotating wheel, and a sliding block is slidably connected to the slide rail.

[0011] Further, a fixing block is fixedly connected to the sliding rod, an adjusting bolt is rotatably connected to the sliding block, and the adjusting bolt is threadedly connected to the fixing block.

[0012] Preferably, a locking rod is rotatably connected to the sliding frame, a locking block is slidably connected to the locking rod, a tension spring is connected between the locking block and the locking rod, and when the locking rod rotates to the lower side, the screen is blocked and fixed by the locking rod.

[0013] Further, a plurality of sets of insertion holes are formed in the sliding frame, and each set of insertion holes is respectively located at the highest point and the lowest point of the rotation trajectory of the locking block with the rotation axis of the locking rod as the center, and the shape of the insertion hole is the same as that of the locking block.

[0014] A method for granulating raw materials for plastic product injection molding mainly includes the following steps:

[0015] S1. Preset the amplitude of the reciprocating movement of the sliding frame during screening by rotating the adjusting bolt;

[0016] S2. Open the inspection port, install the screen into the sliding frame, and rotate the locking block to complete the fixation of the screen;

[0017] S3. Place the corresponding collection device below the discharge hopper;

[0018] S4. Start the device and add plastic fragments into the feeding hopper;

[0019] S5. Guide the extruded plastic after melting through the cooling water tank and then place it between the driving roller and the driven roller;

[0020] S6. After the processing is completed, stop the device, take away the collection device and the screened plastic particles, and place the collection device below the discharge hopper again;

[0021] S7. Open the inspection port and rotate the locking block to pull out the screen, and the plastic particles that do not pass through the screen enter the collection device through the discharge hopper to complete the collection.

[0022] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0023] 1. During the rotation and cutting process of the cutting roller, the present invention can drive the rotating wheel and the sliding rod to rotate, and the sliding rod can further drive the moving rod and the sliding frame to perform reciprocating motion, so as to complete the operation of screening plastic particles on the screen, screen out some small uncut particles and disperse some adhered plastic particles at the same time.

[0024] 2. By adjusting the bolts, the present invention can adjust the position of the sliding rod in the sliding groove, thereby changing the amplitude of the reciprocating motion of the moving frame and avoiding the problem of material accumulation on the screen caused by the screening efficiency not keeping up with the production efficiency.

[0025] 3. The present invention can perform secondary screening on the screened plastic particles through a fan, separating dust and impurities, and improving the quality of the produced plastic particles. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In the drawings:

[0027] Figure 1 is a schematic three-dimensional structure diagram of a raw material granulation device for plastic product injection molding proposed by the present invention;

[0028] Figure 2 is a schematic structure diagram of a cutting machine shell in a raw material granulation device for plastic product injection molding proposed by the present invention;

[0029] Figure 3 is a schematic structure diagram of the interior of a cutting machine shell in a raw material granulation device for plastic product injection molding proposed by the present invention;

[0030] Figure 4 is in a raw material granulation device for plastic product injection molding proposed by the present invention Figure 3 is a schematic structure diagram of part A therein;

[0031] Figure 5 is a cross-sectional view of a cutting machine shell in a raw material granulation device for plastic product injection molding proposed by the present invention;

[0032] Figure 6 is in a raw material granulation device for plastic product injection molding proposed by the present invention Figure 5 is an enlarged schematic structure diagram of part B therein;

[0033] Figure 7 is a schematic structure diagram of a sliding frame part in a raw material granulation device for plastic product injection molding proposed by the present invention;

[0034] Figure 8 is in a raw material granulation device for plastic product injection molding proposed by the present invention Figure 7 is an enlarged schematic structure diagram of part C therein;

[0035] Figure 9 is in a raw material granulation device for plastic product injection molding proposed by the present invention Figure 7 is an enlarged schematic structure diagram of part D therein.

[0036] In the figure: 1, conveyor barrel; 11, feeding hopper; 12, machine head; 13, cooling water tank; 2, cutting machine shell; 21, feeding port; 22, driving roller; 221, first driven pulley; 23, driving gear; 24, driven roller; 241, second driving pulley; 25, driven gear; 26, first conveyor belt; 27, maintenance opening; 3, slide rail; 31, sliding block; 32, adjusting bolt; 33, fixing block; 34, sliding rod; 4, servo motor; 41, cutting roller; 411, first driving pulley; 42, rotating wheel; 421, sliding groove; 43, moving rod; 5, fan; 51, supporting block; 52, rotating shaft; 521, second driven pulley; 53, driven bevel gear; 54, driving bevel gear; 56, second conveyor belt; 6, discharge hopper; 61, partition board; 7, sliding frame; 71, screen; 72, locking rod; 73, locking block; 74, tension spring; 75, insertion hole; 8, transition cavity. Detailed implementation mode

[0037] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0038] Embodiment 1: Refer to Figures 1 - 9 , a raw material granulating device for plastic product injection molding, including a conveyor barrel 1, a feeding hopper 11 is communicated with the conveyor barrel 1, one end of the conveyor barrel 1 is communicated with a machine head 12, and a cooling water tank 13 is arranged below the machine head 12. It also includes: at the other end of the cooling water tank 13, there is a cutting machine shell 2, a feeding port 21 is opened on the cutting machine shell 2, and a driving roller 22, a driven roller 24 and a cutting roller 41 are respectively rotatably connected in the cutting machine shell 2; a rotating wheel 42 is fixedly connected to the cutting roller 41, a sliding groove 421 is opened on the rotating wheel 42, a sliding rod 34 is slidably connected to the sliding groove 421, a moving rod 43 is slidably connected to the cutting machine shell 2, and the moving rod 43 is slidably connected to the sliding rod 34; a sliding frame 7 is fixedly connected below the moving rod 43, and a screen 71 is slidably connected to the sliding frame 7; when the rotating wheel 42 rotates, the sliding rod 34 drives the moving rod 43 and the sliding frame 7 to reciprocate to screen the plastic on the screen 71, and when the sliding rod 34 slides in the sliding groove 421, the amplitude of the reciprocating movement of the sliding frame 7 changes following the sliding rod 34.

[0039] Inside the conveyor barrel 1 of the present invention, there is a rotating screw propelling rod. The inside of the conveyor barrel 1 is cylindrical. An electric heating device is provided inside the conveyor barrel 1. The waste plastic is previously crushed into smaller pieces and then poured into the inside of the conveyor barrel 1 through the feeding hopper 11. Under the propelling action of the screw propelling rod, the plastic pieces are slowly propelled towards the head 12. During the propelling process, the plastic pieces are heated and melted. The melted plastic is extruded through the film holes on the head 12. The extruded plastic is in a long strip shape. The long strip of plastic is guided manually through the bottom of the cooling water tank 13. The cooling water at the bottom of the cooling water tank 13 cools and solidifies the plastic. After the cooling and solidification are completed, the plastic strip is cut into granular by the cutting roller 41 under the guidance of the driving roller 22 and the driven roller 24 and falls onto the sliding frame 7 under the action of inertia. The sliding frame 7 slides in the sliding groove opened on the inner wall of the cutting machine housing 2 through the support rod. While the cutting roller 41 rotates and cuts, it will drive the rotating wheel 42 to rotate together. The rotating wheel 42 drives the sliding rod 34 to rotate. The sliding rod 34 slides in the sliding groove inside the moving rod 43. Thus, the sliding rod 34 can only drive the moving rod 43 to perform a horizontal reciprocating motion. The moving rod 43 is fixedly connected to the sliding frame 7, so it can drive the sliding frame 7 to perform a reciprocating motion. Thus, the operation of screening the plastic particles on the screen 71 can be completed, screening out some small uncut particles and at the same time shaking loose some plastic particles stuck together;

[0040] The sliding groove 421 is a T-shaped groove. The sliding rod 34 slides in the sliding groove 421 through the T-shaped block. Thus, the radius of rotation of the sliding rod 34 can be changed by sliding the sliding rod 34. When the radius of rotation of the sliding rod 34 changes, the maximum distance that the moving rod 43 moves following the sliding rod 34 also changes. Thus, the amplitude of the reciprocating motion of the sliding frame 7 can be changed by changing the position of the sliding rod 34. Furthermore, the amplitude of the motion of the sliding frame 7 can be adjusted according to the production efficiency and the screening efficiency, avoiding the problem of material accumulation on the screen 71 caused by the screening efficiency not being able to keep up with the production efficiency.

[0041] Example 2: Refer to Figures 1 - 9, A granulation device for raw materials used in plastic product injection molding, which is basically the same as that in Embodiment 1. Furthermore: A servo motor 4 is fixedly connected to the cutting machine shell 2, the output end of the servo motor 4 is fixedly connected to the cutting roller 41, a first driving pulley 411 is fixedly connected to the cutting roller 41, a first driven pulley 221 is fixedly connected to the driving roller 22, and a first conveyor belt 26 is connected between the first driving pulley 411 and the first driven pulley 221. A driving gear 23 is fixedly connected to the driving roller 22, a driven gear 25 is fixedly connected to the driven roller 24, and the driven gear 25 meshes with the driving gear 23. A rotating shaft 52 is rotatably connected to the cutting machine shell 2, a second driven pulley 521 is fixedly connected to the rotating shaft 52, a second driving pulley 241 is fixedly connected to the driven roller 24, and a second conveyor belt 56 is connected between the second driving pulley 241 and the second driven pulley 521. A support block 51 is fixedly connected to the cutting machine shell 2, the support block 51 is rotatably connected to the rotating shaft 52, a driving bevel gear 54 is fixedly connected to the rotating shaft 52, a fan 5 is fixedly connected to the support block 51, a driven bevel gear 53 is fixedly connected to the fan blade of the fan 5 through a rotating shaft, and the driven bevel gear 53 meshes with the driving bevel gear 54. An overflow chamber 8 is fixedly connected to the cutting machine shell 2, and the overflow chamber 8 is located between the fan 5 and the sliding frame 7. A discharge hopper 6 is provided on the cutting machine shell 2, and a partition 61 is fixedly connected to the discharge hopper 6. When the screened plastic particles fall from the overflow chamber 8 into the discharge hopper 6, under the influence of the fan 5, the plastic particles with different masses fall to different positions in the discharge hopper 6.

[0042] In the present invention, all power sources are provided by the servo motor 4. The cutting roller 41 provides power for the driving roller 22 through the first conveyor belt 26. The driving roller 22 transmits the power to the driven roller 24 through the driving gear 23 and the driven gear 25, so that the driven roller 24 rotates synchronously with the driving roller 22. The surfaces of the driving roller 22 and the driven roller 24 are made of rubber material with a certain deformation ability, so as to form a certain clamping force on the cooled plastic strip, and then the plastic strip can be conveyed to the cutting roller 41 for cutting;

[0043] The driven roller 24 transmits power to the rotating shaft 52 through the second conveyor belt 56, and drives the fan blades of the fan 5 to rotate under the conduction of the driving bevel gear 54 and the driven bevel gear 53. The sieves on the sieve mesh 71 are mainly concentrated in the middle, and there are no sieve holes on both sides of the sieve mesh 71 following the reciprocating movement direction of the sliding frame 7, so as to ensure that all plastic particles can fall into the lower transition cavity 8 through the sieve holes during the screening process, avoiding the plastic particles from being thrown out. The plastic particles fall from the front of the fan 5 under the guidance of the transition cavity 8. Under the action of the fan 5, plastic particles of different masses are blown different horizontal distances at the same falling distance. The lighter plastic particles are blown to the side away from the fan 5 and slide out from above the partition 61, and the heavier plastic particles are blown a shorter distance and slide out from the bottom of the discharge hopper 6. Some impurities and dust will also be blown away, so that the plastic particles can be secondarily screened. The width of the discharge hopper 6 and the number of internal partitions 61 can be added according to requirements, so as to screen the plastic particles more finely.

[0044] Example 3: Refer to Figures 1 - 9 , a raw material granulating device for plastic product injection molding, which is basically the same as Example 2. Further: A circular slide rail 3 is fixedly connected to the cutting machine shell 2, and the center of the slide rail 3 is the same as the center of the rotating wheel 42. A sliding block 31 is slidably connected to the slide rail 3. A fixed block 33 is fixedly connected to the sliding rod 34. An adjusting bolt 32 is rotatably connected to the sliding block 31. The adjusting bolt 32 is threadedly connected to the fixed block 33. A locking rod 72 is rotatably connected to the sliding frame 7. A locking block 73 is slidably connected to the locking rod 72. A tension spring 74 is connected between the locking block 73 and the locking rod 72. When the locking rod 72 rotates to the lower part, the sieve mesh 71 is blocked and fixed by the locking rod 72. A plurality of sets of insertion holes 75 are provided on the sliding frame 7. Each set of insertion holes 75 is respectively located at the highest point and the lowest point of the rotation trajectory of the locking block 73 with the rotation axis of the locking rod 72 as the center. The shape of the insertion hole 75 is the same as that of the locking block 73. An inspection opening 27 is provided on the cutting machine shell 2.

[0045] In the present invention, by rotating the adjusting bolt 32, the fixed block 33 and the sliding rod 34 can be driven to move to adjust the position of the sliding rod 34 in the sliding groove 421. The centers of the slide rail 3 and the rotating wheel 42 are the same, so that the sliding rod 34 will drive the adjusting bolt 32 and the sliding block 31 to rotate together during the rotation process;

[0046] The locking lever 72 is rotatably connected to the sliding frame 7 through a rotating shaft. When the locking lever 72 rotates vertically downward, under the action of the pulling force provided by the tension spring 74, the locking block 73 slides and inserts into the lower insertion hole 75. At this time, the locking lever 72 is limited, and the locking lever 72 blocks the screen 71, and the screen 71 is fixed. When it is necessary to rotate the locking lever 72, the user only needs to pull the locking block 73 and rotate the locking lever 72 upward and then release the locking block 73. The locking block 73 will then insert into the upper insertion hole 75, and the user can extract the screen 71 from the sliding frame 7. A handle may be provided in the middle of the screen 71 for convenient pulling;

[0047] The position where the maintenance opening 27 is opened corresponds to the position of the sliding frame 7, so that it is convenient for the user to install and replace the screen 71 through the maintenance opening 27.

[0048] Example 4: Refer to Figures 1 - 9 , a method for granulating raw materials for plastic product injection molding, mainly including the following steps:

[0049] S1. Adjust the amplitude of the reciprocating motion screening of the sliding frame 7 by rotating the adjusting bolt 32;

[0050] S2. Open the maintenance opening 27 and rotate the locking levers 72 on both sides until the locking blocks 73 are inserted into the upper insertion holes 75. Insert the screen 71 into the sliding frame 7, and then rotate the locking levers 72 to insert the locking blocks 73 into the lower insertion holes 75 to complete the fixation of the screen 71;

[0051] S3. Place the receiving device below the discharge hopper 6, one at each outlet;

[0052] S4. Start the device and continuously and uniformly add plastic fragments or molten plastic into the hopper 11;

[0053] S5. After the plastic is steadily and continuously extruded from the machine head 12, guide the plastic strip through the cooling water in the cooling water tank 13 through the auxiliary clamping device, and guide the plastic strip to between the driving roller 22 and the driven roller 24 at a position where it can be cooled and formed. Under the action of the driving roller 22 and the driven roller 24, the formed plastic strip is cut into plastic particles and discharged from the discharge hopper 6 after screening;

[0054] S6. Stop the device after the processing is completed or when the collection device is full. Take away the collection device and the screened plastic particles, and place a collection device again below the discharge hopper 6 to collect a small amount of plastic particles remaining on the screen 71 due to not being cut off;

[0055] S7. Open the maintenance opening 27 and extract the screen 71 from the sliding frame 7. The plastic particles on the screen 71 enter the collection device through the discharge hopper 6 to complete the collection.

[0056] The above are only the preferred embodiments of the present invention, and there is no restriction on the present invention in any form. Although the present invention has been disclosed as above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art of the present invention can make some changes or modifications to equivalent embodiments with equivalent changes by using the technical content prompted above within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention still fall within the scope of the present invention's solution.

Claims

1. A raw material granulation equipment for plastic product injection molding, comprising a conveyor barrel (1), the conveyor barrel (1) is connected to a lower hopper (11), one end of the conveyor barrel (1) is connected to a machine head (12), and a cooling water tank (13) is provided below the machine head (12), characterized in that: Also includes: A cutting machine housing (2) is provided at the other end of the cooling water tank (13), a feed port (21) is provided on the cutting machine housing (2), and a driving roller (22), a driven roller (24) and a cutting roller (41) are rotatably connected in the cutting machine housing (2); The cutting roller (41) is fixedly connected to a rotating wheel (42), the rotating wheel (42) is provided with a sliding groove (421), the sliding groove (421) is slidably connected to a sliding rod (34), the cutting machine housing (2) is slidably connected to a moving rod (43), and the moving rod (43) is slidably connected to the sliding rod (34); A sliding frame (7) is fixedly connected below the moving rod (43), and a screen (71) is slidably connected to the sliding frame (7); When the rotating wheel (42) rotates, the sliding rod (34) drives the moving rod (43) and the sliding frame (7) to perform reciprocating motion to screen the plastic on the screen (71); when the sliding rod (34) slides in the sliding groove (421), the amplitude of the reciprocating motion of the sliding frame (7) changes along with the sliding rod (34).

2. The raw material granulation equipment for plastic product injection molding according to claim 1 is characterized in that: A servo motor (4) is fixedly connected to the cutting machine housing (2); an output end of the servo motor (4) is fixedly connected to a cutting roller (41); a first driving pulley (411) is fixedly connected to the cutting roller (41); a first driven pulley (221) is fixedly connected to the driving roller (22); and a first conveyor belt (26) is connected between the first driving pulley (411) and the first driven pulley (221).

3. The raw material granulation equipment for plastic product injection molding according to claim 1, characterized in that: The driving roller (22) is fixedly connected to a driving gear (23), the driven roller (24) is fixedly connected to a driven gear (25), the driven gear (25) is meshed with the driving gear (23), the cutting machine housing (2) is rotatably connected to a rotating shaft (52), the rotating shaft (52) is fixedly connected to a second driven pulley (521), the driven roller (24) is fixedly connected to a second driving pulley (241), and a second conveyor belt (56) is connected between the second driving pulley (241) and the second driven pulley (521).

4. The raw material granulation equipment for plastic product injection molding according to claim 3 is characterized in that: A support block (51) is fixedly connected to the cutting machine housing (2), the support block (51) is rotatably connected to a rotating shaft (52), an active bevel gear (54) is fixedly connected to the rotating shaft (52), a fan (5) is fixedly connected to the support block (51), a fan blade on the fan (5) is fixedly connected to a driven bevel gear (53) via a rotating shaft, and the driven bevel gear (53) is meshed with the active bevel gear (54).

5. The raw material granulation equipment for plastic product injection molding according to claim 4, characterized in that: A transition chamber (8) is fixedly connected to the cutting machine housing (2), and the transition chamber (8) is located between the fan (5) and the sliding frame (7). A discharge hopper (6) is provided on the cutting machine housing (2), and a partition (61) is fixedly connected to the discharge hopper (6). When the screened plastic particles fall from the transition chamber (8) into the discharge hopper (6), plastic particles of different qualities fall to different positions of the discharge hopper (6) under the influence of the fan (5).

6. The raw material granulation equipment for plastic product injection molding according to claim 1, characterized in that: A circular slide rail (3) is fixedly connected to the cutting machine housing (2), the center of the slide rail (3) is the same as the center of the rotating wheel (42), and a sliding block (31) is slidably connected to the slide rail (3).

7. A raw material granulation equipment for plastic product injection molding according to claim 6, characterized in that: The sliding rod (34) is fixedly connected with a fixing block (33), the sliding block (31) is rotatably connected with an adjusting bolt (32), and the adjusting bolt (32) is connected to the fixing block (33) via a thread.

8. The raw material granulation equipment for plastic product injection molding according to claim 1, characterized in that: A locking rod (72) is rotatably connected to the sliding frame (7), a locking block (73) is slidably connected to the locking rod (72), a tension spring (74) is connected between the locking block (73) and the locking rod (72), and when the locking rod (72) is rotated downward, the screen (71) is blocked and fixed by the locking rod (72).

9. The raw material granulation equipment for plastic product injection molding according to claim 8, characterized in that: The sliding frame (7) is provided with a plurality of groups of plug holes (75), each group of the plug holes (75) is respectively located at the highest point and the lowest point of the rotation trajectory of the locking block (73) with the rotation axis of the locking rod (72) as the center, the shape of the plug holes (75) is the same as that of the locking block (73), and the cutting machine housing (2) is provided with an inspection port (27).

10. A method for granulating raw materials for injection molding of plastic products, comprising the equipment for granulating raw materials for injection molding of plastic products according to claim 9, characterized in that: The main steps include: S1. Preset the amplitude of the reciprocating motion of the sliding frame (7) during screening by rotating the adjusting bolt (32); S2, open the inspection port (27), install the screen (71) into the sliding frame (7), and rotate the locking block (73) to fix the screen (71); S3, placing the corresponding collecting device under the discharge hopper (6); S4, start the device and add plastic fragments into the lower hopper (11); S5, guiding the melted and extruded plastic through a cooling water tank (13) and then placing it between a driving roller (22) and a driven roller (24); S6, after the processing is completed, the device is stopped, the collecting device and the screened plastic particles are removed, and the collecting device is placed under the discharge hopper (6) again; S7, opening the inspection port (27) and rotating the locking block (73) to pull out the screen (71), and the plastic particles that have not passed through the screen (71) enter the collecting device through the discharge hopper (6) to be collected.

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