Granulation mold and plastic granulator

Abstract

The utility model relates to the technical field of plastic granulation, and provides a granulation mold, which comprises an outer mold part, the outer mold part is provided with a working surface, and the working surface faces a granulation device; a plurality of first discharging holes are formed in the outer mold part in a penetrating manner; a heating piece is arranged on the surface, away from the working face, of the outer mold part and used for heating the working face, and the effect that the situation that the discharging port is blocked due to the fact that molten plastic is too fast solidified at the discharging port is reduced is achieved. The utility model further provides a plastic granulator which comprises an extrusion molding device, a granulation mold and a grain cutting device. The granulation mold is mounted at the discharge end of the extrusion molding device, and the granulation mold is the granulation mold disclosed by the utility model; and the granulating device is arranged on the outer side of the granulating mold and is used for carrying out granulating treatment on the plastic output from the granulating mold.

Description

Technical Field

[0001] This application relates to the field of plastic granulation technology, and in particular to a granulation mold and a plastic granulator. Background Technology

[0002] Plastic granulators are used to cut rolled, sheet, or block plastic materials into pellets after melt extrusion. In the granulation process, the plastic material is first melted at high temperature into a slurry state, then extruded through the discharge hole of the die, cooled and solidified, and then cut into pellets by a pelletizing device.

[0003] In actual production, to improve the efficiency of cooling and solidification, cooling devices such as water spray are often added to the outside of the mold's discharge hole to accelerate the cooling and solidification of the molten plastic. However, for plastics such as PP, PE, and PS, which are more prone to solidification and clumping when exposed to water or cold in the molten state, solidification can easily occur at the mold's discharge hole, leading to blockage of the discharge hole and even the extrusion channel, thus affecting the granulation production efficiency. Utility Model Content

[0004] In order to reduce the blockage of the discharge port due to the molten plastic cooling and solidifying too quickly at the discharge port during granulation production, when a cooling device is provided, this application provides a granulation mold and a plastic granulator.

[0005] On the one hand, the granulation mold provided in this application adopts the following technical solution:

[0006] A granulation mold is applied to a plastic granulator, the plastic granulator including a pelletizing device; the granulation mold includes an outer mold portion, the outer mold portion having a working surface facing the pelletizing device; the outer mold portion is provided with a plurality of first discharge holes; the outer mold portion is provided with a heating element for heating the outer mold portion.

[0007] By adopting the above technical solution, when the pelletizing mold discharges material, the pelletizing device equipped with a spraying mechanism will spray and cool the working surface when the outer mold discharges material. At this time, the heating element is used to heat the working surface, which can keep the outer mold part, including the working surface, at a certain temperature, reduce the impact of spray cooling on the temperature of the first discharge hole, reduce the possibility of molten plastic solidifying when it encounters cold in the first discharge hole, thereby reducing the situation of molten plastic clogging the discharge port due to solidification too quickly at the discharge hole, thereby improving the production efficiency of plastic pelleting.

[0008] Optionally, the heating element is arranged around the central axis of the outer mold portion.

[0009] By adopting the above technical solution, the heating element can achieve high uniformity in heating the working surface.

[0010] Optionally, an external power supply mechanism is provided; the heating element is an electric heating wire; the power supply mechanism is connected to the end of the heating element that passes through the periphery of the outer mold portion, and the power supply mechanism is used to supply power to regulate the heating element to achieve heating; the plurality of first discharge holes are all located within the virtual circle formed by the heating element in the outer mold portion.

[0011] By adopting the above technical solution, the heating element requires an external power supply, thus necessitating an extension of its end to the outside of the outer mold portion. The purpose of using the heating element to enclose the multiple first discharge holes is twofold: firstly, the extension of the heating element beyond the outer mold portion does not affect the distribution of the multiple first discharge holes; secondly, it facilitates the modification of the existing outer mold portion to form the outer mold portion of this application.

[0012] Optionally, it also includes an inner mold portion, which is detachably connected to the side of the outer mold portion away from the working surface; the inner mold portion is provided with a plurality of second discharge holes, which are connected to a plurality of first discharge holes in a one-to-one correspondence; the outer mold portion has a heating groove on the surface facing the inner mold portion, which is used to accommodate the heating element.

[0013] By adopting the above technical solution, the heating element is limited and built into the outer mold by the cooperation of the inner mold and the heating groove, which enhances the installation stability of the heating element and facilitates the disassembly and replacement of the heating element.

[0014] Optionally, the inner mold portion has a plurality of outwardly protruding ejector components on its surface facing the outer mold portion. Each ejector component has a through ejector channel that communicates with the second ejector hole. An isolation component is provided at the end of the ejector component away from the inner mold portion. The outer mold portion has a corresponding slot for inserting the ejector components on its surface facing the inner mold portion. The first ejector hole is located at the bottom of the slot and communicates with the ejector channel.

[0015] By adopting the above technical solution, the ejector component facing the outer mold part cooperates with the slot of the outer mold part, which can quickly align and connect the first ejector hole, the storage cylinder, and the second ejector hole to form the entire plastic extrusion channel. After the outer mold part and the inner mold part are connected and installed, the separator is located between the slot and the ejector component, at the position of the inner mold part closest to the working surface of the outer mold part, which can reduce the cooling effect transmitted from the working surface to a certain extent.

[0016] When molten plastic enters the inner mold, its temperature is simultaneously conducted to both the inner mold and the ejector connected to it, ensuring the plastic remains molten as it enters the second ejector hole, the ejector channel, and the first ejector hole. However, during the granulation process, the outer mold is simultaneously subjected to cooling from an external cooling device and heating from its heating elements, potentially leading to significant temperature variations. The isolation element helps to isolate the temperature changes between the outer and inner molds, reducing the impact of the cooling effect on the ejector and inner mold on the working surface of the outer mold.

[0017] Optionally, the discharge component is provided with a recessed platform for disassembling and assembling the isolation component, and the end face of the discharge component is flush with that of the isolation component.

[0018] By adopting the above technical solution, the isolation component is located between the discharge component and the slot, which can ensure the tightness between the two; the isolation component is installed in a detachable manner at the end of the discharge component, which makes it convenient to select isolation components of different materials and service life for installation and replacement according to usage requirements.

[0019] Optionally, the inner diameter of the second discharge hole gradually increases from one end near the discharge member to the other end.

[0020] By adopting the above technical solution, the second discharge hole is set in a conical shape, and the end with the larger diameter receives the plastic first, forming a certain transition buffer at the end of the granulation mold. That is, it is equivalent to forming a temporary cavity to accommodate the plastic before it enters the discharge channel, thereby reducing the accumulation of plastic residue in the inner mold part.

[0021] Optionally, the end of the ejector component away from the outer mold portion is provided with an abutment, and the second ejector hole is opened in the abutment; the inner mold portion has a mounting groove on the surface opposite to the outer mold portion, and the mounting groove is used to accommodate the abutment; the inner mold portion has a through mounting hole, and the mounting hole is used for the ejector component to pass through; the ejector component has a threaded portion, and the threaded portion is threadedly connected to a limiting thread, and the limiting thread is used to abut against the surface of the inner mold portion facing the outer mold portion.

[0022] By adopting the above technical solution, when installing the discharge part, the discharge part is inserted into the installation hole from the installation groove and the abutment abuts against the groove wall of the installation groove. Then, the limiting nut is screwed onto the discharge part from the end of the discharge part away from the abutment, and finally the limiting nut abuts against the surface of the inner mold part facing the outer mold part. This achieves a detachable connection between the discharge part and the inner mold part, and also makes the second discharge hole and the discharge channel form a smooth extrusion channel.

[0023] Optionally, a flow guide is provided on the surface of the inner mold portion away from the outer mold portion. The flow guide is conical and coaxially arranged with the inner mold portion. The outer diameter of the flow guide gradually decreases from one end near the inner mold portion to the other end. All the second discharge holes are arranged around the flow guide.

[0024] By adopting the above technical solution, when the molten plastic flows into the inner mold, under the pressure of the side wall of the guide member, the plastic is pressed towards the peripheral second discharge hole, thereby increasing the speed at which the plastic flows into the second discharge hole.

[0025] The guide component is located in the middle of the inner side of the inner mold section, which can reduce plastic accumulation and residue, and at the same time, it can work with the side of the inner mold section to squeeze the plastic into the second discharge hole.

[0026] On the other hand, the plastic granulator provided in this application adopts the following technical solution:

[0027] A plastic granulator includes an extrusion device, a granulation die, and a pelletizing device; the granulation die is installed at the discharge end of the extrusion device, and the granulation die is as described above; the pelletizing device is disposed outside the granulation die and is used to pelletize the plastic output from the granulation die.

[0028] During granulation, the plastic first enters the extrusion device 4, where the heating mechanism 42 heats the plastic. The conveying screw extrudes the plastic and transports it to the discharge end. The plastic then enters the temporary storage cavity 51 of the temporary storage box 5 from the discharge end. Under the pressure of the subsequent plastic, it moves through the guide component 23 and the inner mold part 2, and then passes through the first discharge hole 14, the discharge channel 32, and the second discharge hole 24 to reach the working surface 11. The cutter assembly 72 in the pelletizing device 7 pelletizes the plastic located on the working surface 11. During pelletizing, the nozzle 723, the first spray assembly 74, and the second spray assembly 75 spray the working surface 11 to cool it down, which facilitates pelletizing and accelerates the solidification of the granulated plastic, thereby improving the pelletizing efficiency and effect.

[0029] In summary, this application includes at least one of the following beneficial technical effects:

[0030] 1. By setting a heating element in the outer mold part with a working surface, the heating element is used to heat the working surface to balance the temperature of the working surface, thereby reducing the possibility of molten plastic solidifying in the first discharge hole, and further reducing the situation of clogging the discharge port due to the molten plastic solidifying too quickly at the discharge hole, thus ensuring the production efficiency of granulation.

[0031] 2. By setting an inner mold part that is detachably connected to the outer mold part, the heating element is located inside the granulation mold, which on the one hand protects the heating element, and on the other hand reduces the impact of the heating element on the molten plastic in the second discharge hole;

[0032] 3. By setting a conical guide at the middle position of the surface of the inner mold part away from the outer mold part, when the plastic is pressed towards the second discharge hole, the side wall of the guide part cooperates with the inner side of the inner mold part to apply pressure to the plastic, so that the plastic enters the second discharge hole more quickly and reduces the possibility of plastic accumulating in the inner mold part. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this application.

[0034] Figure 2 This is a schematic diagram illustrating the structure of the inner mold part and the outer mold part in Embodiment 1.

[0035] Figure 3 This is a schematic diagram illustrating the structure of the flow guide in Embodiment 1.

[0036] Figure 4 This is a schematic diagram illustrating the structure of the discharge component in Example 1.

[0037] Figure 5 yes Figure 2 Enlarged diagram of part A.

[0038] Figure 6 This is a schematic diagram of the overall structure of Embodiment 2 of this application.

[0039] Figure 7 This is a schematic diagram showing the installation position of the granulation mold in Example 2.

[0040] Figure 8 This is a schematic diagram illustrating the structure of the temporary storage cavity in Example 2.

[0041] Figure 9 This is a schematic diagram illustrating the structure of the pelletizing device in Example 2.

[0042] Explanation of reference numerals in the attached drawings: 1. Outer mold section; 11. Working surface; 12. Heating tank; 13. Heating element; 14. First discharge hole; 15. Slot; 2. Inner mold section; 21. Mounting groove; 22. Mounting hole; 23. Guide element; 24. Second discharge hole; 3. Discharge element; 31. Abutment element; 32. Discharge channel; 33. Limit nut; 34. Recess; 35. Isolator; 4. Extrusion device; 41. Sleeve; 42. Adding... 5. Heating mechanism; 6. Temporary storage bin; 7. Temporary storage cavity; 8. Granulation mold; 9. Pelletizing device; 10. Shell; 11. Cutting head assembly; 12. Rotating shaft; 13. Blade; 24. Spray nozzle; 25. Drive motor; 26. First spray assembly; 37. First conveying pipe; 48. First spray head; 99. Second spray assembly; 10. Second conveying pipe; 11. Second spray head; 22. Second spray head; 33. Power supply mechanism. Detailed Implementation

[0043] The following is in conjunction with the appendix Figure 1-9 This application will be described in further detail.

[0044] This application discloses a granulation mold for use in a plastic granulator, which includes a pelletizing device.

[0045] Example 1

[0046] Reference Figure 1 and Figure 2 A granulation mold includes an outer mold part 1 and an inner mold part 2, which are detachably connected to the outer mold part 1 by bolts.

[0047] The outer mold section 1 has a working surface 11 facing the pelletizing device. The pelletizing device, which is equipped with a cooling component, cools the working surface 11 when the outer mold section 1 discharges material. The outer mold section 1 has multiple first discharge holes 14 extending through it.

[0048] The outer mold portion 1 has a heating groove 12 on its surface opposite to the working surface 11. The heating groove 12 is arranged around the central axis of the outer mold portion 1, and both ends of the heating groove 12 penetrate the sidewall of the outer mold portion 1. An annular heating element 13 is provided in the heating groove 12 in the outer mold portion 1, and both ends of the heating element 13 extend out of the outer mold portion 1 from both ends of the heating groove 12. The outer mold is provided with a power supply mechanism 8, which is connected to the end of the heating element 13. The heating element 13 is used to heat the outer mold portion 1 to balance the temperature of the working surface 11, so that the outer mold portion 1, including the working surface 11, can be maintained at a certain temperature, thereby reducing the possibility of molten plastic solidifying upon cooling in the first discharge hole 14, and reducing the possibility of molten plastic solidifying in the outer mold portion 1.

[0049] In this embodiment, the plurality of first discharge holes 14 are all located within the virtual circle formed by the heating element 13, so that the heating element 13 extending out of the outer mold part 1 affects the original distribution of the first discharge holes 14, and facilitates the modification of the existing outer mold part 1 to form the outer mold part 1 described in this application.

[0050] In this embodiment, the heating element 13 is a heating wire. In other embodiments, the heating element 13 may also be a temperature control tube in which a temperature control medium, such as heat-conducting oil, flows through its inner cavity.

[0051] Reference Figure 3 , Figure 4 and Figure 5The inner mold portion 2 has multiple mounting grooves 21 on its surface opposite to the outer mold portion 1, and the inner diameter of the mounting grooves 21 gradually increases from one end near the outer mold portion 1 to the other end. The inner mold portion 2 has multiple mounting holes 22 that are connected to the mounting grooves 21 one-to-one. The surface of the inner mold portion 2 facing the outer mold portion has multiple outwardly protruding ejector parts 3 that extend axially along the inner mold portion 2.

[0052] One end of the ejector 3 has an integrally formed abutment 31, the outer wall of which fits against the wall of the mounting groove 21. The abutment 31 has a through-hole 24 for plastic to pass through, and the diameter of the second ejector hole 24 gradually increases from one end near the outer mold part 1 to the other end.

[0053] The mounting hole 22 is used for the material discharge component 3 to pass through. The material discharge component 3 has a material discharge channel 32 through it. The material discharge channel 32 extends along the length of the material discharge component 3 and is connected to the second material discharge hole 24.

[0054] The ejector part 3 has a threaded portion, and a limiting nut 33 is threadedly connected to the ejector part 3 through the threaded portion. The limiting nut 33 is used to abut against the surface of the inner mold part 2 facing the outer mold part 1. When installing the ejector part 3, the ejector part 3 is inserted into the mounting hole 22 from the mounting groove 21 and the abutting part 31 abuts against the groove wall of the mounting groove 21. Then, the limiting nut 33 is screwed onto the ejector part 3 from the end of the ejector part 3 away from the abutting part 31, and finally the limiting nut 33 abuts against the surface of the inner mold part 2 facing the outer mold part 1.

[0055] In other embodiments, the ejector 3 may also be integrally formed with the inner mold 2, or a detachable connection may be achieved using other structures.

[0056] The outer mold part 1 has multiple slots 15 on its surface facing the inner mold part 2, and the multiple slots 15 are used for inserting multiple ejector parts 3. The first ejector hole 14 is located at the bottom of the slot 15 and is connected to the ejector channel 32.

[0057] The end of the ejector component 3 furthest from the abutment component 31 is detachably connected to an isolator 35. The isolator 35 is made of high-temperature molten material and provides a certain degree of isolation from the temperature from the working surface 11, reducing the possibility of molten plastic solidifying in the ejector channel 32. With this design, the ejector component 3, which faces the outer mold part 1, cooperates with the slot 15 of the outer mold part 1, and can quickly align and connect the first ejector hole 14, the ejector channel 32, and the second ejector hole 24 to form the entire plastic extrusion channel. After the outer mold part 1 and the inner mold part 2 are connected and installed, the isolator 35 is located between the slot 15 and the ejector component 3, at the position of the inner mold part 2 closest to the working surface 11 of the outer mold part 1, which can reduce the cooling effect transmitted from the working surface 11 to a certain extent.

[0058] The isolation member 35 and the discharge member 3 are detachably connected in the following way: the end face of the discharge member 3 away from the abutment member 31 is provided with an annular recess 34 for the isolation member 35 to be disassembled and assembled, and the end face of the discharge member 3 is flush with the end face of the isolation member 35.

[0059] Furthermore, a flow guide 23 is fixed to the surface of the inner mold portion 2 opposite to the outer mold portion 1. The flow guide 23 has a conical structure and is coaxially arranged with the inner mold portion 2. The outer diameter of the flow guide 23 gradually decreases from one end near the inner mold portion 2 to the other end. Multiple second discharge holes 24 are arranged around the flow guide 23. With this design, when the plastic flows into the inner mold portion 2, under the pressure of the side wall of the flow guide 23, the plastic is pressed towards the peripheral second discharge holes 24, thereby increasing the speed at which the plastic flows into the second discharge holes 24, reducing the accumulation and residue of plastic in the inner mold portion 2, and further reducing the possibility of plastic clogging the first discharge hole 14.

[0060] The implementation principle of Example 1 is as follows: the plastic in the extrusion device is conveyed to the inner mold section 2, and then flows to the working surface 11 through the second discharge hole 24, the discharge channel 32 and the first discharge hole 14 in sequence.

[0061] During the plastic flow process, the isolation member 35 acts as a temperature insulator for the plastic in the flow cavity, reducing the impact of the temperature from the working surface 11 on the plastic in the discharge channel 32; the heating member 13 heats the working surface 11 to balance the temperature of the working surface 11 and reduce the possibility of the plastic in the first discharge hole 14 solidifying.

[0062] Understandably, staff can choose whether to activate heating element 13 based on the specific operating conditions of the granulator.

[0063] Example 2

[0064] This embodiment provides a plastic granulator.

[0065] Reference Figure 6 and Figure 7 A plastic granulator includes an extrusion device 4, a temporary storage bin 5, a granulation die 6, and a pelletizing device 7. The granulation die 6 is the granulation die described in Example 1.

[0066] The extrusion device 4 includes a sleeve 41, a conveying screw (not shown in the figure) and a heating mechanism 42. One end of the sleeve 41 is the feed end and the other end is the discharge end. The heating mechanism 42 is arranged on the outer periphery of the sleeve 41. The heating mechanism 42 is used to heat the sleeve 41 and the plastic inside the sleeve 41. The conveying screw is used to convey the plastic inside the sleeve 41.

[0067] Reference Figure 8The temporary storage bin 5 is installed at the discharge end of the sleeve 41, and the temporary storage bin 5 has a temporary storage cavity 51 for temporarily storing molten plastic. The granulation mold 6 is located at the end of the temporary storage bin 5 away from the sleeve 41, and the guide member 23 extends into the temporary storage cavity 51.

[0068] The pelletizing device 7 is located on the outside of the pelletizing mold 6 and is used to pelletize the plastic extruded from the pelletizing mold 6.

[0069] Reference Figure 9 The pelletizing device 7 includes a housing 71, a cutter head assembly 72, a drive motor 73, a first spray assembly 74, and a second spray assembly 75. The housing 71 is hinged to one side of the temporary storage box. The side of the housing 71 facing the pelletizing mold 6 has a pelletizing chamber, in which the cutter head assembly 72 is installed.

[0070] The cutter head assembly 72 includes a rotating shaft 721 and multiple blades 722. The rotating shaft 721 is rotatably connected to the surface of the housing 71 facing the granulation mold 6, and the multiple blades 722 are all connected to the periphery of the rotating shaft 721. The drive motor 73 is mounted on the surface of the housing 71 opposite to the granulation mold 6, and the drive motor 73 is used to drive the rotating shaft 721 to rotate.

[0071] Multiple nozzles 723 are provided at the end of the rotating shaft 721, and the multiple nozzles 723 are connected to external cooling water.

[0072] The first spray assembly 74 includes a first conveying pipe 741 and a plurality of first spray heads 742. The first conveying pipe 741 is disposed on the top of the housing 71, and the plurality of first spray heads 742 are disposed on the periphery of the first conveying pipe 741, and the plurality of first spray heads 742 spray downward at an angle.

[0073] The second spray assembly 75 includes a second conveying pipe 751 and a plurality of second spray heads 752. The second conveying pipe 751 is disposed at the bottom of the housing 71, and the plurality of second spray heads 752 are disposed on the periphery of the second conveying pipe 751, and the plurality of second spray heads 752 spray upward at an angle.

[0074] The principle of Example 2 is as follows: During granulation, the plastic first enters the extrusion device 4, the heating mechanism 42 heats the plastic, the conveying screw extrudes the plastic and conveys it to the discharge end; the plastic enters the temporary storage cavity 51 of the temporary storage box 5 from the discharge end, and then moves the guide component 23 and the inner mold part 2 under the pressure of the plastic that arrives later, and then passes through the first discharge hole 14, the discharge channel 32 and the second discharge hole 24 in sequence to reach the working surface 11; the cutter assembly 72 in the pelletizing device 7 pelletizes the plastic located on the working surface 11. During pelletizing, the nozzle 723, the first spray assembly 74 and the second spray assembly 75 spray the working surface 11 to cool it down, so as to facilitate pelletizing and accelerate the curing of the granulated plastic.

[0075] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A pelletizing mold, applied to a plastic pelletizing machine, the plastic pelletizing machine including a pelletizing device, characterized in that: The device includes an outer mold part (1) having a working surface (11) facing the pelletizing device (7); the outer mold part (1) having a plurality of first discharge holes (14) through it; the outer mold part (1) having a heating element (13) for heating the outer mold part (1); and an inner mold part (2) detachably connected to the side of the outer mold part (1) away from the working surface (11); the inner mold part (2) having a plurality of second discharge holes (24) through it, the plurality of second discharge holes (24) corresponding to and communicating with the plurality of first discharge holes (14); and a heating groove (12) being opened on the surface of the outer mold part (1) facing the inner mold part (2), the heating groove (12) being used to accommodate the heating element (13).

2. The granulation mold according to claim 1, characterized in that: The heating element (13) is arranged around the central axis of the outer mold part (1).

3. The granulation mold according to claim 2, characterized in that: An external power supply mechanism (8) is provided; the heating element (13) is an electric heating wire; the power supply mechanism (8) is connected to the end of the heating element (13) that passes through the periphery of the outer mold part (1), and the power supply mechanism (8) is used to supply power to regulate the heating element (13) to achieve heating; multiple first discharge holes (14) are all located within the virtual circle formed by the heating element (13) in the outer mold part (1).

4. The granulation mold according to claim 1, characterized in that: The inner mold part (2) has a plurality of outwardly protruding ejector parts (3) on the surface facing the outer mold part (1). The ejector parts (3) have a through ejector channel (32) and the ejector channel (32) is connected to the second ejector hole (24). The end of the ejector part (3) away from the inner mold part (2) is provided with an isolation part (35). The outer mold part (1) has a slot (15) for inserting the ejector parts (3) on the surface facing the inner mold part (2). The first ejector hole (14) is located at the bottom of the slot (15) and is connected to the ejector channel (32).

5. The granulation mold according to claim 4, characterized in that: The discharge part (3) is provided with a recessed platform for disassembling and assembling the isolation part (35), and the end face of the discharge part (3) is flush with the end face of the isolation part (35).

6. The granulation mold according to claim 5, characterized in that: The inner diameter of the second discharge hole (24) gradually increases from one end near the discharge member (3) to the other end.

7. The granulation mold according to claim 6, characterized in that: The end of the ejector (3) away from the outer mold (1) is provided with an abutment (31), and the second ejector hole (24) is opened on the abutment (31); the inner mold (2) is provided with an installation groove (21) on the surface away from the outer mold (1), and the installation groove (21) is used to accommodate the abutment (31); the inner mold (2) is provided with an installation hole (22) through it, and the installation hole (22) is used for the ejector (3) to pass through it; the ejector (3) has a threaded part, and the threaded part is threadedly connected to a limiting thread, and the limiting thread is used to abut against the surface of the inner mold (2) facing the outer mold (1).

8. The granulation mold according to claim 1, characterized in that: The inner mold part (2) is provided with a flow guide (23) on the surface opposite to the outer mold part (1). The flow guide (23) is conical and is coaxially arranged with the inner mold part (2). The outer diameter of the flow guide (23) gradually decreases from one end near the inner mold part (2) to the other end. All the second discharge holes (24) are arranged around the flow guide (23).

9. A plastic granulator, characterized in that: It includes an extrusion device (4), a pelletizing die (6), and a pelletizing device (7); the pelletizing die (6) is installed at the discharge end of the extrusion device (4), and the pelletizing die (6) is the pelletizing die according to any one of claims 1-8; the pelletizing device (7) is disposed on the outside of the pelletizing die (6) and is used to pelletize the plastic output from the pelletizing die (6).

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