Plastic particle production apparatus and process

Abstract

The application relates to the technical field of plastic recycling processing, in particular to a plastic particle production device and process, which comprises an extruding mechanism, the extruding mechanism comprises a double-screw extruder, a drawbar mold is installed on the left side of the double-screw extruder, a drawbar mold core is rotatably installed in the drawbar mold, a plurality of groups of drawbar holes are uniformly arranged on the outer ring wall of the right half side of the drawbar mold core in the circumferential direction, and the diameters of the drawbar holes in different groups gradually increase in the clockwise direction. When the drawbar holes with different sizes need to be switched, a hexagonal wrench is used to rotate a hexagonal stud, the hexagonal stud drives a dial to rotate, the dial drives a grooved wheel to rotate at a fixed angle, the grooved wheel drives the drawbar mold core to rotate at a fixed angle, the drawbar holes with different diameters are switched to an injection molding station, the molten plastic is extruded from the drawbar holes with different diameters, the drawbar holes with different diameters are conveniently and quickly extruded, the drawbar mold does not need to be disassembled for replacement, and the switching efficiency during production of plastic particles with different diameters is improved.

Description

Technical Field

[0001] This invention relates to the field of plastic recycling and processing technology, specifically to a plastic particle production equipment and process. Background Technology

[0002] Plastic recycled pellets are pellets made from waste plastic products. They are categorized by raw material type: Grade 1 (processed from unused scraps), Grade 2 (processed from primary recycled materials), and Grade 3 (processed from multiple recycled materials). Grade 1 refers to scraps or offcuts that haven't been disposed of, such as sprue or glue residue. These are of relatively good quality, meaning they haven't been used before. They are small scraps left over from the virgin material processing, or materials that didn't meet quality standards. Pellets made from these raw materials have good transparency and their quality is comparable to virgin materials.

[0003] In plastic pellet processing, strip forming is the core step in the water-cooled strip forming and pelletizing process. It refers to the process of extruding molten plastic strips from the extruder's strip forming die, cooling them in a water tank, stretching and shaping them using a traction device, and then feeding them into a pelletizer to be cut into pellets. The orifice diameter of the strip forming die (also called the extrusion die head) determines the diameter of the subsequently cut plastic pellets. Different diameter plastic pellets differ significantly in production, processing, and application, directly affecting the feeding stability, plasticizing efficiency, and mechanical properties of the finished products in downstream processing. It also determines the application scenarios and market positioning of the pellets. Therefore, different strip forming dies are required when producing plastic pellets of different diameters. Existing strip forming dies are generally fastened to the extruder head with flange bolts, and the orifice diameter of the strip forming die is fixed. Changing the strip forming die requires stopping the machine for replacement, which is time-consuming and affects the processing efficiency of plastic pellets. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a plastic particle production equipment, including an extrusion mechanism comprising a twin-screw extruder. A strip-drawing die is mounted on the left side of the twin-screw extruder, and a strip-drawing core is rotatably mounted inside the strip-drawing die. Several sets of strip-drawing holes are evenly distributed circumferentially on the outer ring wall of the right half of the strip-drawing core, with the diameter of different sets of strip-drawing holes gradually increasing clockwise. A drive assembly for rotating the strip-drawing core at a fixed angle is mounted on the front side of the strip-drawing die. A sealing strip for sealing and limiting the strip-drawing core is slidably mounted inside the strip-drawing die. An unlocking assembly for releasing the sealing and limiting is also mounted inside the strip-drawing die. A water injection cavity is formed inside the strip-drawing die above the strip-drawing core, and a guide plate is fixedly connected to the left side of the strip-drawing die below the strip-drawing core.

[0005] A forming mechanism is used to cool, dry, pelletize, and screen the strands extruded from the strand die.

[0006] A conveyor, installed between the forming mechanism and the twin-screw extruder, is used to recycle and transport non-conforming particles after screening.

[0007] In one possible implementation, several pull rod holes in the same group are distributed at equal intervals, and the pull rod holes in adjacent groups are staggered. The pull rod holes are funnel-shaped and completely penetrate the pull rod mold core. The large end of the pull rod hole is located on the right half of the pull rod mold core.

[0008] In one possible implementation, the inside of the strip mold has an injection cavity located on the right side of the strip mold core. The extrusion orifice of the twin-screw extruder is connected to the right end of the injection cavity. A discharge nozzle is fixedly connected to the left side of the strip mold. A strip opening is formed on the left side of the discharge nozzle. The injection cavity is connected to the strip opening through a corresponding strip hole. A drain outlet is formed at the bottom of the discharge nozzle. The water injection cavity is connected to the drain outlet through a corresponding strip hole.

[0009] In one possible implementation, the pull strip mold core is provided with a plurality of sealing grooves evenly distributed circumferentially, the sealing grooves are distributed alternately with each group of pull strip holes, the cross-section of the sealing strip is stepped and is inserted into the sealing groove, and a return spring is fixedly connected between the side of the sealing strip away from the central axis of the pull strip mold core and the inner wall of the pull strip mold.

[0010] In one possible implementation, the drive assembly includes a grooved wheel and a dial that are rotatably mounted on the front side of the pull rod mold. The grooved wheel is coaxially and fixedly connected to the pull rod mold core. The dial is located on the right side of the grooved wheel and is drivenly connected to it. An internal hexagonal spur head is coaxially and fixedly connected to the front side of the dial. A plurality of locking arcs are evenly formed on the right half of the grooved wheel in a circumferential direction. The number of locking arcs is the same as the number of pull rod holes and corresponds one-to-one.

[0011] In one possible implementation, the drive assembly further includes a cover fixedly mounted on the front side of the pull rod mold, the cover covering the outside of the grooved wheel and the dial, the front end of the internal hexagonal spur head rotating through to the front side of the cover, the cover having a hollowed-out window located on the front side of the grooved wheel, an indicator arrow located on the right side of the internal hexagonal spur head being fixedly connected to the front side of the cover, and a protrusion being fixedly connected to the outer ring wall of the internal hexagonal spur head.

[0012] In one possible implementation, the unlocking assembly includes a wedge-shaped shell fixedly installed on the side of the sealing strip away from the central axis of the pull strip mold core. The wedge-shaped shell has a wedge-shaped cavity that is larger at the front and smaller at the back. A push rod is slidably installed inside the pull strip mold. A push ring corresponding to the push rod is coaxially fixedly connected to the rear side of the dial. The rear end of the push rod is slidably connected to the inclined side of the wedge-shaped cavity, and the front end is slidably abutting against the rear side of the push ring. The push ring has a groove. A baffle is fixedly connected to the push rod. A return spring is fixedly connected between the rear side of the baffle and the inner wall of the pull strip mold.

[0013] In one possible implementation, the top of the strip mold is fixedly connected to a cold water connector and a hot water connector, the bottom ends of which are connected to the water injection chamber, and the guide plate is located below the discharge nozzle and its left end is inclined downward.

[0014] In one possible implementation, the forming mechanism includes a cold water tank located on the left side of the twin-screw extruder, the left end of the guide plate extending into the interior of the cold water tank, a dryer located on the left side of the cold water tank, a pelletizer located on the left side of the dryer, a vibrating screen installed below the discharge port of the pelletizer, a feed hopper installed on the top of the twin-screw extruder, and the feed end of the conveyor installed below the waste discharge port of the vibrating screen and the discharge end installed on top of the feed hopper.

[0015] The beneficial effects of this invention are as follows: 1. When switching between different sizes of pull rod holes, the hex wrench rotates the hex socket head, causing the hex socket head to drive the dial to rotate. The dial then drives the grooved wheel to rotate at a fixed angle, which in turn drives the pull rod mold core to rotate at a fixed angle. This switches the pull rod holes of different diameters to the injection molding station, allowing molten plastic to be extruded from the pull rod holes of different diameters. This facilitates the rapid extrusion of pull rods of different diameters without the need to disassemble the pull rod mold for replacement, thus improving the switching efficiency when producing plastic particles of different diameters.

[0016] 2. In this invention, when molten plastic is extruded from the strip hole, a guide plate is used to receive the strip, reducing the drop height of the strip. At the same time, the water injection chamber discharges cooling water onto the guide plate through a set of strip holes connected to it. The cooling water isolates and initially cools the strip and the guide plate, which can prevent the molten plastic from sticking to the guide plate and also prevent the strip diameter from decreasing due to its own gravity stretching caused by excessive vertical drop. This is beneficial to improving the quality of plastic particles after the strip is granulated. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0018] Figure 2This is a three-dimensional structural diagram of the extrusion mechanism of the present invention.

[0019] Figure 3 This is a three-dimensional structural schematic diagram of the pull strip mold of the present invention.

[0020] Figure 4 This is a right-side sectional view of the pull strip mold of the present invention.

[0021] Figure 5 This is a three-dimensional structural diagram of the discharge nozzle of the present invention.

[0022] Figure 6 This is a three-dimensional structural diagram of the pull strip mold core of the present invention.

[0023] Figure 7 This is a three-dimensional structural schematic diagram of the grooved wheel of the present invention.

[0024] Figure 8 This is a three-dimensional structural diagram of the sealing strip of the present invention.

[0025] Figure 9 This is a three-dimensional structural diagram of the unlocking component of the present invention.

[0026] Figure 10 This is a three-dimensional structural diagram of the cover of the present invention.

[0027] Figure 11 This is a process flow diagram of the present invention.

[0028] In the diagram: 1. Extrusion mechanism; 11. Twin-screw extruder; 111. Feed hopper; 12. Strip die; 121. Injection cavity; 122. Discharge nozzle; 123. Strip outlet; 124. Drain outlet; 13. Strip die core; 131. Strip hole; 132. Sealing groove; 133. Sealing strip; 134. Return spring 1; 14. Drive assembly; 141. Grooved wheel; 1411. Locking arc; 142. Dial; 143. Socket head; 1431. Protrusion. 144. Cover; 1441. Hollowed-out window; 1442. Indicator arrow; 15. Unlocking component; 151. Wedge-shaped shell; 152. Push rod; 153. Push ring; 154. Groove; 155. Baffle; 156. Second return spring; 16. Water injection chamber; 161. Cold water connector; 162. Hot water connector; 17. Guide plate; 2. Molding mechanism; 21. Cold water tank; 22. Air dryer; 23. Pelletizer; 24. Vibrating screen; 3. Conveyor. Detailed Implementation

[0029] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be implemented in many other ways different from those described below, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0030] Please see Figure 1 - Figure 11 A plastic particle production device includes an extrusion mechanism 1, which includes a twin-screw extruder 11. A strip-drawing die 12 is installed on the left side of the twin-screw extruder 11. A strip-drawing core 13 is rotatably installed inside the strip-drawing die 12. Several sets of strip-drawing holes 131 are evenly opened circumferentially on the outer ring wall of the right half of the strip-drawing core 13. The diameter of different sets of strip-drawing holes 131 gradually increases in the clockwise direction. A drive assembly 14 for driving the strip-drawing core 13 to rotate at a fixed angle is installed on the front side of the strip-drawing die 12. A sealing strip 133 for sealing and limiting the strip-drawing core 13 is slidably installed inside the strip-drawing die 12. An unlocking assembly 15 for releasing the sealing and limiting is also installed inside the strip-drawing die 12. A water injection cavity 16 is opened inside the strip-drawing die 12 above the strip-drawing core 13. A guide plate 17 located below the strip-drawing core 13 is fixedly connected to the left side of the strip-drawing die 12.

[0031] Forming mechanism 2 is used to cool, dry, pelletize and screen the strips extruded from strip die 12.

[0032] Conveyor 3 is installed between the forming mechanism 2 and the twin-screw extruder 11 to recycle and transport unqualified particles after screening.

[0033] In practical use, when it is necessary to switch between different sizes of pull strip holes 131, the drive component 14 drives the pull strip mold core 13 to rotate at a certain angle, switching the pull strip holes 131 of different diameters to the injection molding station, allowing the molten plastic to be extruded from the pull strip holes 131 of different diameters. This facilitates the quick extrusion of pull strips of different diameters without the need to disassemble the pull strip mold 12 for replacement, thus improving the switching efficiency when producing plastic particles of different diameters.

[0034] After the core 13 is rotated to the appropriate position, the core 13 is sealed and limited by the sealing strip 133. This not only prevents the core 13 from rotating during extrusion, but also improves the sealing between the core 13 and the die 12, preventing molten plastic from overflowing into the adjacent set of holes 131 along the gap between the die 12 and the core 13.

[0035] When molten plastic is extruded from the strip hole 131, the guide plate 17 receives the strip, reducing the drop height of the strip. At the same time, the water injection chamber 16 discharges cooling water onto the guide plate 17 through a set of strip holes 131 connected to it. The cooling water isolates and initially cools the strip and the guide plate 17, which can prevent the molten plastic from sticking to the guide plate 17 and also prevent the strip diameter from shrinking due to its own gravity caused by excessive vertical drop. This is beneficial to improving the quality of plastic particles after the strip is granulated.

[0036] After being cooled, dried, granulated, and screened by the forming mechanism 2, the strips produce qualified plastic particles that are discharged from the left side. Unqualified plastic particles fall onto the conveyor 3, which then transports them to the twin-screw extruder 11 for recycling, thus reducing waste generation.

[0037] Please see Figure 4 , Figure 5 and Figure 6 Several pull rod holes 131 in the same group are distributed at equal intervals, and the pull rod holes 131 in adjacent groups are staggered. The pull rod holes 131 are funnel-shaped and completely penetrate the pull rod mold core 13. The large end of the pull rod hole 131 is located on the right half of the pull rod mold core 13.

[0038] In practical use, by staggering the two adjacent sets of pull strip holes 131, interference between the two adjacent sets of pull strip holes 131 can be avoided. Molten plastic is injected from the large end of the pull strip hole 131 and squeezed out from the small end of the pull strip hole 131, so that the molten plastic is discharged in strip shape to form a pull strip. By designing the large end of the pull strip hole 131 on the right half of the pull strip mold core 13, it is only necessary to adjust the right half of the pull strip mold core 13 by rotating it in the forward and reverse directions to switch between pull strip holes 131 of different sizes.

[0039] Please see Figure 3 , Figure 4 and Figure 5 The inside of the strip mold 12 is provided with an injection cavity 121 located on the right side of the strip mold core 13. The extrusion hole of the twin-screw extruder 11 is connected to the right end of the injection cavity 121. The left side of the strip mold 12 is fixedly connected with a discharge nozzle 122. The left side of the discharge nozzle 122 is provided with a strip opening 123. The injection cavity 121 is connected to the strip opening 123 through the corresponding strip hole 131. The bottom of the discharge nozzle 122 is provided with a drain outlet 124. The water injection cavity 16 is connected to the drain outlet 124 through the corresponding strip hole 131.

[0040] In practical use, the molten plastic extruded by the twin-screw extruder 11 is injected into the injection chamber 121. The injection chamber 121 disperses the molten plastic into a set of corresponding strip holes 131, so that the molten plastic is extruded from the small end of the strip hole 131 into a strip. Finally, the strip is discharged downward from the strip opening 123. At the same time, the cooling water in the water injection chamber 16 is discharged downward from the corresponding set of strip holes 131 after passing through the strip holes 131, so that the cooling water falls onto the guide plate 17.

[0041] Please see Figure 4 , Figure 6 , Figure 8 and Figure 9 The core 13 of the pull strip mold is evenly provided with several sealing grooves 132 in the circumferential direction. The sealing grooves 132 and each set of pull strip holes 131 are distributed alternately. The cross-section of the sealing strip 133 is stepped and is inserted into the sealing groove 132. A return spring 134 is fixedly connected between the side of the sealing strip 133 away from the central axis of the pull strip mold 13 and the inner wall of the pull strip mold 12.

[0042] In practical use, after the pull strip mold core 13 is adjusted to the appropriate position, the return spring 134 is aligned with the sealing strip 133. The rebound force of the return spring 134 pushes the sealing strip 133 to move closer to the central axis of the pull strip mold core 13, so that the return spring 134 and the corresponding sealing strip 133 are inserted together. The return spring 134 is used to limit and seal the pull strip mold core 13, which can not only prevent the pull strip mold core 13 from rotating during the injection molding process, but also prevent the molten plastic from overflowing into the adjacent pull strip holes 131 along the gap between the pull strip mold 12 and the pull strip mold core 13. By designing the return spring 134 as a stepped shape, a sealing effect can be provided when the return spring 134 and the sealing strip 133 are inserted and matched.

[0043] Please see Figure 3 , Figure 5 and Figure 7 The drive assembly 14 includes a grooved wheel 141 and a dial 142 rotatably mounted on the front side of the pull strip mold 12. The grooved wheel 141 is coaxially and fixedly connected to the pull strip mold core 13. The dial 142 is located on the right side of the grooved wheel 141 and is connected to it for transmission. An internal hexagonal spur head 143 is coaxially and fixedly connected to the front side of the dial 142. Several locking arcs 1411 are evenly opened on the right half of the grooved wheel 141. The number of locking arcs 1411 is the same as the number of pull strip holes 131 and corresponds one-to-one.

[0044] In practical use, when adjusting the pull rod core 13, use an existing Allen wrench to rotate the Allen head 143, causing the Allen head 143 to drive the dial 142 to rotate. The dial 142 then drives the grooved wheel 141 to rotate at a fixed angle, which in turn drives the pull rod core 13 to rotate at a fixed angle, thus achieving the switching adjustment of different groups of pull rod holes 131. Since the number of locking arcs 1411 is the same as the number of groups of pull rod holes 131, when the dial 142 rotates to match different locking arcs 1411, the corresponding group of pull rod holes 131 can be switched to a state that connects with the injection cavity 121, making it easy to accurately switch the pull rod holes 131.

[0045] Compared with the traditional circumferentially symmetrical grooved wheel 141, since the grooved wheel 141 of the present invention only has a locking arc 1411 on the right half, the left half of the grooved wheel 141 cannot be driven and cooperated with the dial 142, so as to avoid the grooved wheel 141 from over-rotating and ensure that the injection cavity 121 is always connected to the large end of one of the sets of pull strip holes 131.

[0046] Please see Figure 3 , Figure 7 and Figure 10 The drive assembly 14 also includes a cover 144 fixedly installed on the front side of the pull rod mold 12. The cover 144 covers the outside of the grooved wheel 141 and the dial 142. The front end of the internal hexagonal spur head 143 rotates through to the front side of the cover 144. The cover 144 has a hollow window 1441 located on the front side of the grooved wheel 141. An indicator arrow 1442 located on the right side of the internal hexagonal spur head 143 is fixedly connected to the front side of the cover 144. A protrusion 1431 is fixedly connected to the outer ring wall of the internal hexagonal spur head 143.

[0047] In practical use, the cover 144 can protect the grooved wheel 141 and the dial 142, preventing them from being bumped. When the internal hexagonal head 143 is rotated to switch the pull rod mold core 13, the dial 142 can be observed through the hollow window 1441 to see which locking arc 1411 is in a cooperating state, so as to quickly determine which set of pull rod holes 131 is connected to the injection cavity 121, which facilitates the subsequent rotation switching of the pull rod mold core 13.

[0048] When the internal hexagonal head 143 is rotated to adjust different sets of pull rod holes 131, the internal hexagonal head 143 rotates one revolution, and the pull rod core 13 just switches the adjacent set of pull rod holes 131 to the state of communicating with the injection cavity 121. The protrusion 1431 is indicated by the indicator arrow 1442, which makes it easy to quickly determine whether the internal hexagonal head 143 has been rotated to the correct position.

[0049] Please see Figure 8 and Figure 9The unlocking component 15 includes a wedge-shaped shell 151 fixedly installed on the side of the sealing strip 133 away from the central axis of the pull strip mold core 13. The wedge-shaped shell 151 has a wedge-shaped cavity that is larger at the front and smaller at the back. A push rod 152 is slidably installed inside the pull strip mold 12. A push ring 153 corresponding to the push rod 152 is coaxially fixedly connected to the rear side of the dial 142. The rear end of the push rod 152 is slidably connected to the inclined side of the wedge-shaped cavity, and the front end is slidably abutting against the rear side of the push ring 153. A groove 154 is provided on the push ring 153. A baffle 155 is fixedly connected to the push rod 152. A return spring 156 is fixedly connected between the rear side of the baffle 155 and the inner wall of the pull strip mold 12.

[0050] In practical use, initially, the front end of the push rod 152 is located in the corresponding groove 154, and the rear end of the push rod 152 is located at the front end of the wedge-shaped cavity's inclined side. At this time, the sealing strip 133 is inserted into the sealing groove 132. When switching between different sets of pull strip holes 131, the rotating dial 142 will drive the push ring 153 to rotate together, causing the groove 154 to gradually shift away from the push rod 152. The push ring 153 pushes the push rod 152 backward, causing the push rod to move backward. The rear end of 152 pushes the inclined edge of the wedge cavity of the wedge shell 151, thereby pushing the wedge shell 151 and the sealing strip 133 to move away from the central axis of the pull strip mold core 13, releasing the sealing limit of the sealing strip 133 on the pull strip mold core 13, and preventing the sealing strip 133 from affecting the rotation of the pull strip mold core 13. Then, the dial 142 rotates to the state of cooperating with the hollow window 1441, so that the dial 142 drives the groove wheel 141 and the pull strip mold core 13 to rotate, and adjusts the pull strip hole 131.

[0051] When the push rod 152 moves backward, it drives the baffle 155 to move backward as well. At this time, the second return spring 156 is compressed and contracts. After the dial 142 rotates once, the groove 154 rotates to the front side of the push rod 152 again. At this time, the rebound force of the second return spring 156 pushes the baffle 155 and the push rod 152 forward, so that the rear end of the push rod 152 no longer pushes the wedge shell 151. At this time, the rebound force of the first return spring 134 pushes the sealing strip 133 to move towards the central axis of the pull strip mold core 13, so that the sealing strip 133 is inserted into the corresponding sealing groove 132, and the pull strip mold core 13 is sealed and limited again.

[0052] Please see Figure 3 and Figure 4 The top of the strip mold 12 is fixedly connected to a cold water connector 161 and a hot water connector 162. The bottom ends of both the cold water connector 161 and the hot water connector 162 are connected to the water injection chamber 16. The guide plate 17 is located below the discharge nozzle 122 and its left end is tilted downward.

[0053] In practical use, the cold water connector 161 is connected to the existing cold water pipeline, and the hot water connector 162 is connected to the existing hot water pipeline. When the pull strip hole 131, which is connected to the injection cavity 121, extrudes the pull strip outward, the cold water pipeline injects cold water into the water injection cavity 16 from the cold water connector 161, so that the pull strip hole 131, which is connected to the water injection cavity 16, can continuously discharge cold water to the surface of the guide plate 17, thus preventing the pull strip from sticking to the guide plate 17.

[0054] When the pull rod core 13 rotates to switch between different pull rod holes 131 connected to the injection cavity 121, the pull rod hole 131 connected to the water injection cavity 16 will also be switched accordingly. At this time, hot water needs to be injected into the water injection cavity 16 through the hot water pipe to allow hot water to flow into the pull rod hole 131 connected to it for cleaning, so as to avoid the plastic residue in the pull rod hole 131 causing blockage. It should be noted that since the large opening of the pull rod hole 131 is located on the right half of the pull rod core 13, when the injection cavity 121 is connected to the large opening of the uppermost pull rod hole 131, the water injection cavity 16 will be connected to the small opening of the lowermost pull rod hole 131. At this time, the water in the water injection cavity 16 can still be discharged downward through the pull rod hole 131 connected to it, without affecting the normal operation of the water injection cavity 16.

[0055] Please see Figure 1 and Figure 2 The forming mechanism 2 includes a cold water tank 21 located on the left side of the twin-screw extruder 11. The left end of the guide plate 17 extends into the interior of the cold water tank 21. A dryer 22 is located on the left side of the cold water tank 21. A pelletizer 23 is located on the left side of the dryer 22. A vibrating screen 24 is installed below the discharge port of the pelletizer 23. A feed hopper 111 is also installed on the top of the twin-screw extruder 11. The feed end of the conveyor 3 is installed below the waste discharge port of the vibrating screen 24, and the discharge end is installed on the top of the feed hopper 111.

[0056] A plastic particle production process includes the following steps:

[0057] S1, Extrusion: The raw material is heated and mixed to a molten state through a twin-screw extruder 11, and then the molten plastic is extruded from the strip hole 131 into a strip.

[0058] S2, Cooling: The strips squeezed out by the strip hole 131 fall into the cold water tank 21 to cool and set.

[0059] S3, air drying: Pass the shaped strip through the air dryer 22 and blow the moisture off the strip through the air dryer 22.

[0060] S4, pelletizing: The dried strips are fed into pelletizer 23 and cut into pellets.

[0061] S5, Screening: The cut plastic particles fall onto the vibrating screen 24, where they are vibrated and screened to output qualified plastic particles.

[0062] S6, Waste recycling: Unqualified plastic particles are discharged by the vibrating screen 24 onto the conveyor 3, and the conveyor 3 transports the unqualified plastic particles to the feed hopper 111 for recycling.

[0063] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "connected," "installed," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, an integral connection, or a sliding connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0064] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made based on the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A plastic particle production equipment, characterized in that, include: An extrusion mechanism (1) includes a twin-screw extruder (11). A strip-drawing die (12) is installed on the left side of the twin-screw extruder (11). A strip-drawing core (13) is rotatably installed inside the strip-drawing die (12). Several sets of strip-drawing holes (131) are evenly opened circumferentially on the outer ring wall of the right half of the strip-drawing core (13). The diameter of different sets of strip-drawing holes (131) gradually increases in the clockwise direction. A device for driving the strip-drawing core (131) is installed on the front side of the strip-drawing die (12). 3) A drive assembly (14) for fixed-angle rotation, a sealing strip (133) for sealing and limiting the pull strip core (13) is slidably installed inside the pull strip mold (12), an unlocking assembly (15) for releasing the sealing and limiting is also installed inside the pull strip mold (12), a water injection cavity (16) located above the pull strip core (13) is opened inside the pull strip mold (12), and a guide plate (17) located below the pull strip core (13) is fixedly connected to the left side of the pull strip mold (12). The forming mechanism (2) is used to cool, dry, pelletize and screen the strips extruded by the strip die (12); A conveyor (3) is installed between the forming mechanism (2) and the twin-screw extruder (11) for recycling and conveying unqualified particles after screening; The inside of the strip mold (12) is provided with an injection cavity (121) located on the right side of the strip mold core (13). The extrusion hole of the twin screw extruder (11) is connected to the right end of the injection cavity (121). The left side of the strip mold (12) is fixedly connected with a discharge nozzle (122). The left side of the discharge nozzle (122) is provided with a strip opening (123). The injection cavity (121) is connected to the strip opening (123) through the corresponding strip hole (131). The bottom of the discharge nozzle (122) is provided with a drain outlet (124). The water injection cavity (16) is connected to the drain outlet (124) through the corresponding strip hole (131).

2. The plastic particle production equipment according to claim 1, characterized in that: Several pull strip holes (131) in the same group are distributed at equal intervals in front and behind. The pull strip holes (131) in two adjacent groups are staggered in front and behind. The pull strip holes (131) are funnel-shaped and completely penetrate the pull strip mold core (13). The large end of the pull strip hole (131) is located on the right half of the pull strip mold core (13).

3. The plastic particle production equipment according to claim 1, characterized in that: The pull strip core (13) is evenly provided with several sealing grooves (132) in the circumferential direction. The sealing grooves (132) are distributed alternately with each group of pull strip holes (131). The cross-section of the sealing strip (133) is stepped and is inserted into the sealing groove (132). A return spring (134) is fixedly connected between the side of the sealing strip (133) away from the central axis of the pull strip core (13) and the inner wall of the pull strip mold (12).

4. The plastic particle production equipment according to claim 3, characterized in that: The drive assembly (14) includes a grooved wheel (141) and a dial (142) rotatably mounted on the front side of the pull rod mold (12). The grooved wheel (141) is coaxially fixedly connected to the pull rod mold core (13). The dial (142) is located on the right side of the grooved wheel (141) and is connected to it in a transmission manner. The front side of the dial (142) is coaxially fixedly connected to an internal hexagonal spur head (143). The right half of the grooved wheel (141) is evenly provided with a number of locking arcs (1411) in the circumferential direction. The number of locking arcs (1411) is the same as the number of pull rod holes (131) and corresponds one-to-one.

5. The plastic particle production equipment according to claim 4, characterized in that: The drive assembly (14) also includes a cover (144) fixedly installed on the front side of the pull rod mold (12). The cover (144) covers the outside of the grooved wheel (141) and the dial (142). The front end of the internal hexagonal spur (143) rotates through to the front side of the cover (144). The cover (144) has a hollow window (1441) located on the front side of the grooved wheel (141). An indicator arrow (1442) located on the right side of the internal hexagonal spur (143) is fixedly connected to the front side of the cover (144). A protrusion (1431) is fixedly connected to the outer ring wall of the internal hexagonal spur (143).

6. The plastic particle production equipment according to claim 5, characterized in that: The unlocking component (15) includes a wedge-shaped shell (151) fixedly installed on the side of the sealing strip (133) away from the central axis of the pull strip mold core (13). The wedge-shaped shell (151) has a wedge-shaped cavity that is larger at the front and smaller at the back. The pull strip mold (12) has a push rod (152) that is slidably installed in the front and back. The rear side of the dial (142) is coaxially fixedly connected to a push ring (153) that corresponds to the push rod (152). The rear end of the push rod (152) is slidably connected to the inclined side of the wedge cavity, and the front end is slidably abutting against the rear side of the push ring (153). The push ring (153) has a groove (154). The push rod (152) has a baffle (155) fixedly connected to it. The rear side of the baffle (155) is fixedly connected to the inner wall of the pull strip mold (12). A reset spring (156) is fixedly connected between the rear side of the baffle (155) and the inner wall of the pull strip mold (12).

7. The plastic particle production equipment according to claim 1, characterized in that: The top of the pull strip mold (12) is fixedly connected to a cold water connector (161) and a hot water connector (162). The bottom ends of the cold water connector (161) and the hot water connector (162) are connected to the water injection chamber (16). The guide plate (17) is located below the discharge nozzle (122) and its left end is tilted downward.

8. The plastic particle production equipment according to claim 1, characterized in that: The forming mechanism (2) includes a cold water tank (21) located on the left side of the twin-screw extruder (11). The left end of the guide plate (17) extends into the interior of the cold water tank (21). A dryer (22) is located on the left side of the cold water tank (21). A pelletizer (23) is located on the left side of the dryer (22). A vibrating screen (24) is installed below the discharge port of the pelletizer (23). A feed hopper (111) is also installed on the top of the twin-screw extruder (11). The feed end of the conveyor (3) is installed below the waste discharge port of the vibrating screen (24), and the discharge end is installed on the top of the feed hopper (111).

9. A process for producing plastic particles, characterized in that: This is accomplished using a plastic particle production equipment as described in any one of claims 1-8. Includes the following steps: S1, Extrusion: The raw materials are heated and mixed to a molten state through a twin-screw extruder (11), and then the molten plastic is extruded into strips through the strip hole (131); S2, Cooling: The strips squeezed out by the strip hole (131) fall into the cold water tank (21) to cool and set; S3, air drying: Pass the shaped strip through the air dryer (22) and blow the moisture off the strip through the air dryer (22); S4, pelletizing: The dried strips are fed into a pelletizer (23) and cut into pellets; S5, Screening: The cut plastic particles fall onto the vibrating screen (24), and the vibrating screen (24) screens the plastic particles to output qualified plastic particles. S6, Waste recycling: Unqualified plastic particles will be discharged by the vibrating screen (24) onto the conveyor (3), and the unqualified plastic particles will be transported to the feed hopper (111) for recycling by the conveyor (3).

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