Extrusion mechanism for plastic granulation

Abstract

The present invention relates to the technical field of plastic granulation, and provides an extrusion mechanism for plastic granulation. The extrusion mechanism comprises: an extrusion tube base, wherein the extrusion tube base is in communication with a discharge port at the front end of an extruder, the front end of the extrusion tube base is sleeved with an extrusion die nozzle, extrusion holes are arrayed inside the extrusion die nozzle, and the specifications of the extrusion die nozzle are distinguished by the diameter of the extrusion holes; and a high-temperature-resistant seal ring is mounted outside the front end of the extrusion tube base and is located inside the extrusion die nozzle. In the present invention, the extrusion die nozzle and the extrusion tube base are connected together by means of engagement, and the extrusion die nozzle can be replaced based on the different sizes of the required particles, thereby making the replacement of the extrusion die nozzle easier and more time-saving. The present invention solves the problem in the initial design and development of existing extrusion mechanisms for plastic granulation, in which traditional bolts are mostly used for connection and fixation to ensure the firmness of the connection between a multi-hole die nozzle and a machine body, resulting in cumbersome and time-consuming replacement of the multi-hole die nozzle when it is necessary to produce plastic particles of other specifications.

Description

An extrusion mechanism for plastic pelletizing Technical Field

[0001] This invention relates to the field of plastic granulation technology, and more particularly to an extrusion mechanism for plastic granulation. Background Technology

[0002] In my country, the processing of building plastic products largely involves plasticizing building plastic powder and then processing it into shapes. Extruders are the most widely used equipment in polymer processing. After the polymer is mixed with various additives, it is fed into the extruder to melt and further mix evenly. The mixture is then passed through a multi-hole die to form multiple strips, which are then made into granules.

[0003] For example, the Chinese patent "CN110253817A Plastic Extruder" includes a frame. The raw material processing mechanism includes a heating chamber disposed within the frame. A first motor is fixedly installed on the top end face of the frame. The lower output shaft of the first motor is fixedly connected to a motor shaft. The motor shaft passes through the heating chamber and rotates between it and the bottom wall of the heating chamber, feeding plastic raw materials into a hopper. The plastic raw materials in the hopper enter the heating chamber through a feeding pipe. The heating component heats the raw materials in the heating chamber. Injection molding is performed by pushing with a cylinder. The internal gap is small, which can make the plastic in the injection chamber completely clean. Before injection molding, the already melted plastic can be squeezed to remove the internal air and ensure the injection molding effect.

[0004] Currently, in order to ensure the firmness of the connection between the multi-hole die and the machine body, most of the existing plastic granulation extrusion mechanisms use traditional bolts for connection and fixation when they are designed and developed. When it is necessary to produce plastic granules of other specifications, it is cumbersome and time-consuming to replace the multi-hole die. It is necessary to manually remove the bolts used for fixing one by one with a wrench and then tighten them again, which is quite time-consuming.

[0005] Summary of the Invention

[0006] This disclosure relates to an extrusion mechanism for plastic granulation, which solves the problem that existing plastic granulation extrusion mechanisms, in order to ensure the firmness of the connection between the multi-hole die and the machine body, mostly use traditional bolts for connection and fixation. When it is necessary to produce plastic granules of other specifications, it is cumbersome and time-consuming to replace the multi-hole die. It is necessary to manually remove the bolts used for fixing one by one with a wrench and then tighten them again, which is quite time-consuming.

[0007] In a first aspect, this disclosure provides an extrusion mechanism for plastic granulation, specifically comprising: an extrusion tube seat; the extrusion tube seat is connected to the discharge port at the front end of an extruder, an extrusion die is fitted at the front end of the extrusion tube seat, the extrusion die has extrusion orifices arranged in an array inside, and the extrusion die is categorized according to the diameter of the extrusion orifices; a high-temperature resistant sealing ring is installed on the outside of the front end of the extrusion tube seat, the high-temperature resistant sealing ring being located inside the extrusion die; a movable positioning sleeve is fitted on the outside of the extrusion tube seat, the front end of the movable positioning sleeve contacting the extrusion die; a rotary adjusting sleeve is connected to the outside of the extrusion tube seat, the rotary adjusting sleeve being located outside the movable positioning sleeve, and a handle is provided on the outside of the rotary adjusting sleeve; a limit plug is connected to the outside of the extrusion tube seat, the limit plug being located between the extrusion die and the movable positioning sleeve.

[0008] Furthermore, an annular groove is provided on the outer side of the front end of the extrusion tube seat, and a high-temperature resistant sealing ring is located in the annular groove. The front end of the extrusion tube seat is inserted into the inside of the extrusion die, and the high-temperature resistant sealing ring is in contact with the inner side of the extrusion die.

[0009] Furthermore, the extrusion tube seat has four snap-fit ​​blocks arranged in a circumferential shape near the front end, and four snap-fit ​​grooves arranged in a circumferential shape around the extrusion die. The snap-fit ​​grooves are L-shaped, and the snap-fit ​​blocks on the extrusion tube seat are connected to the snap-fit ​​grooves. The extrusion die and the extrusion tube seat are connected together by snap-fit. The high-temperature resistant sealing ring provides a sealing effect at the connection between the extrusion die and the extrusion tube seat. The extrusion die can be replaced according to the different particle sizes required.

[0010] Furthermore, the movable positioning sleeve is slidably connected to the outside of the extrusion tube seat, and four guide blocks are arranged in a circumferential shape on the outside of the extrusion tube seat. The movable positioning sleeve is arranged in a circumferential shape on the outside of the extrusion tube seat, and the guide blocks provided on the extrusion tube seat are slidably connected to the movable holes.

[0011] Furthermore, the front end of the movable positioning sleeve is provided with four positioning blocks in a circumferential shape, and the positioning blocks are inserted into the snap-fit ​​groove provided in the extrusion die.

[0012] Furthermore, a spring is fitted outside the extrusion tube seat, with the rear end of the spring contacting the rear end of the extrusion tube seat and the front end of the spring contacting the rear end of the movable positioning sleeve. When the snap-fit ​​block moves to the innermost end of the snap-fit ​​groove, the opening of the snap-fit ​​groove aligns with the positioning insert block. The movable positioning sleeve moves forward under the influence of the spring thrust, causing the positioning insert block to be inserted into the snap-fit ​​groove. The movable positioning sleeve fixes the extrusion die and prevents the extrusion die from rotating.

[0013] Furthermore, the inner side of the rotary adjustment sleeve is in movable contact with the outer side of the movable positioning sleeve, and the inside of the rotary adjustment sleeve is provided with four sliding holes in a circumferential shape. The sliding holes are connected to the movable holes, and the guide block provided on the extrusion tube seat is slidably connected in the sliding holes.

[0014] Furthermore, the movable positioning sleeve has four force-receiving protrusions arranged in a circumferential shape near the rear end, and the rotary adjustment sleeve has four force-receiving inclined surfaces arranged in a circumferential shape at the rear end. The force-receiving protrusions on the movable positioning sleeve slide in contact with the force-receiving inclined surfaces. When it is necessary to remove the extrusion die connected to the front end of the extrusion tube seat, the rotary adjustment sleeve is rotated by the handle. The force-receiving protrusions contact the force-receiving inclined surfaces and are subjected to force. The rotary adjustment sleeve drives the movable positioning sleeve to move backward, and the spring gradually contracts, causing the positioning insert to separate from the snap-fit ​​groove, thereby releasing the fixation of the extrusion die.

[0015] Furthermore, the extrusion tube seat has four limiting grooves arranged in a circumferential shape on its exterior. The limiting grooves are located between the snap-fit ​​block and the guide block. The limiting plug is inserted into the limiting grooves provided on the extrusion tube seat. The front end of the movable positioning sleeve contacts the limiting plug. When the movable positioning sleeve moves to its rearmost end, the limiting groove is exposed and is flush with the front end of the movable positioning sleeve. The limiting plug is then inserted into the limiting groove, so that the limiting plug contacts the front end of the movable positioning sleeve. The limiting plug prevents the movable positioning sleeve from moving forward and resetting, thus freeing up both hands to change the extrusion die.

[0016] This invention provides an extrusion mechanism for plastic granulation, which has the following beneficial effects:

[0017] In use, this invention connects the extrusion die and the extrusion tube seat via a snap-fit ​​mechanism. A high-temperature resistant sealing ring seals the connection between the die and the tube seat. The extrusion die can be easily replaced according to the required particle size. A guide block slides into the movable hole, guiding the movement of the movable positioning sleeve. When the snap-fit ​​block reaches the innermost end of the snap-fit ​​groove, the groove aligns with the positioning insert. The movable positioning sleeve moves forward under spring pressure, inserting the positioning insert into the snap-fit ​​groove. The movable positioning sleeve then secures the extrusion die, preventing rotation and ensuring a strong connection between the die and the tube seat.

[0018] Furthermore, when it is necessary to remove the extrusion die connected to the front end of the extrusion tube seat, the handle drives the rotating adjustment sleeve to rotate. The force-bearing protrusion contacts the force-bearing inclined surface and receives force. The rotating adjustment sleeve drives the movable positioning sleeve to move backward, and the spring gradually contracts, causing the positioning insert to separate from the snap-fit ​​groove, releasing the fixation of the extrusion die. The extrusion die can then be rotated in the opposite direction to remove the extrusion die from the front end of the extrusion tube seat. When the handle is released, the spring pushes the movable positioning sleeve forward to reset, and the movable positioning sleeve drives the rotating adjustment sleeve to rotate in the opposite direction to reset.

[0019] Furthermore, when the movable positioning sleeve moves to its rearmost position, the limiting groove is exposed and flush with the front end of the movable positioning sleeve. The limiting plug is then inserted into the limiting groove, making contact with the front end of the movable positioning sleeve. The limiting plug prevents the movable positioning sleeve from moving forward and resetting, freeing up both hands to change the extrusion die, making the process more user-friendly. When the limiting plug separates from the limiting groove, the movable positioning sleeve resets itself due to the spring force, thus securing the extrusion die.

[0020] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below.

[0022] The accompanying drawings described below are only related to some embodiments of the invention and are not intended to limit the invention.

[0023] In the attached diagram:

[0024] Figure 1 shows a schematic diagram of the axial structure of the extrusion mechanism for plastic pelletizing of this application in the state of connection between the movable positioning sleeve and the extrusion die;

[0025] Figure 2 shows a schematic diagram of the axial structure of the extrusion mechanism for plastic pelletizing in this application with the limiting plug connected to the extrusion tube seat;

[0026] Figure 3 shows a schematic diagram of the axial structure of the extrusion tube seat and extrusion die of the extrusion mechanism for plastic pelletizing in this application in the disassembled state;

[0027] Figure 4 shows a schematic diagram of the axial structure of the extrusion tube seat of the extrusion mechanism for plastic granulation of this application;

[0028] Figure 5 shows a schematic diagram of the axial structure of the extrusion die of the extrusion mechanism for plastic pelletizing in this application;

[0029] Figure 6 shows a schematic diagram of the axial structure of the movable positioning sleeve of the extrusion mechanism for plastic pelletizing in this application;

[0030] Figure 7 shows a schematic diagram of the rotating adjustment sleeve shaft side structure of the extrusion mechanism for plastic pelletizing of this application;

[0031] Figure 8 shows a schematic diagram of the axial structure of the limiting plug of the extrusion mechanism for plastic pelletizing of this application.

[0032] List of reference numerals in the attached diagram: 1. Extrusion tube seat; 101. Annular groove; 102. Snap-fit ​​block; 103. Guide block; 104. Limiting groove; 2. Extrusion die; 201. Extrusion hole; 202. Snap-fit ​​groove; 3. High-temperature resistant sealing ring; 4. Movable positioning sleeve; 401. Movable hole; 402. Positioning insert; 403. Force-bearing protrusion; 5. Rotary adjustment sleeve; 501. Handle; 502. Sliding hole; 503. Force-bearing inclined surface; 6. Spring; 7. Limiting insert. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Example 1: Please refer to Figures 1 to 8:

[0035] This invention proposes an extrusion mechanism for plastic granulation, comprising: an extrusion tube seat 1; the extrusion tube seat 1 is connected to the discharge port at the front end of the extruder, and an extrusion die 2 is fitted at the front end of the extrusion tube seat 1. The extrusion die 2 has extrusion holes 201 arranged in an internal pattern, and the extrusion die 2 is categorized according to the diameter of the extrusion holes 201; a high-temperature resistant sealing ring 3 is installed on the outside of the front end of the extrusion tube seat 1, located inside the extrusion die 2; a movable positioning sleeve 4 is fitted on the outside of the extrusion tube seat 1, with its front end in contact with the extrusion die 2; a rotary adjustment sleeve 5 is connected to the outside of the extrusion tube seat 1, located outside the movable positioning sleeve 4, and a handle 501 is provided on the outer side of the rotary adjustment sleeve 5; a limit plug 7 is connected to the outside of the extrusion tube seat 1, located between the extrusion die 2 and the movable positioning sleeve 4. Between the positioning sleeves 4; an annular groove 101 is provided on the outer front end of the extrusion tube seat 1, and the high-temperature resistant sealing ring 3 is located in the annular groove 101. The front end of the extrusion tube seat 1 is inserted into the inside of the extrusion die 2, and the high-temperature resistant sealing ring 3 is in contact with the inner side of the extrusion die 2; four snap-fit ​​blocks 102 are provided in a circumferential shape near the outer front end of the extrusion tube seat 1, and four snap-fit ​​grooves 202 are provided in a circumferential shape on the outside of the extrusion die 2. The snap-fit ​​grooves 202 are L-shaped, and the snap-fit ​​blocks 102 provided on the extrusion tube seat 1 are connected in the snap-fit ​​grooves 202. The extrusion die 2 and the extrusion tube seat 1 are connected together by snap-fit. The high-temperature resistant sealing ring 3 plays a sealing role at the connection between the extrusion die 2 and the extrusion tube seat 1. The extrusion die 2 can be replaced according to the different particle sizes required, making the replacement of the extrusion die 2 easier.

[0036] In this embodiment, the movable positioning sleeve 4 is slidably connected to the outside of the extrusion tube seat 1. Four guide blocks 103 are arranged in a circumferential shape around the outside of the extrusion tube seat 1. Four movable holes 401 are arranged in a circumferential shape around the outside of the movable positioning sleeve 4. The guide blocks 103 on the extrusion tube seat 1 are slidably connected to the movable holes 401. Four positioning inserts 402 are arranged in a circumferential shape at the front end of the movable positioning sleeve 4. The positioning inserts 402 are inserted into the snap-fit ​​grooves 202 provided on the extrusion die 2. A spring 6 is fitted onto the outside of the extrusion tube seat 1. The rear end of the spring 6 contacts the rear end of the extrusion tube seat 1. The front end contacts the rear end of the movable positioning sleeve 4. Using the above technical solution, the guide block 103 slides with the movable hole 401 to guide the movement of the movable positioning sleeve 4. When the snap-fit ​​block 102 moves to the innermost end of the snap-fit ​​groove 202, the groove of the snap-fit ​​groove 202 aligns with the positioning insert 402. The movable positioning sleeve 4 moves forward under the influence of the spring 6, so that the positioning insert 402 is inserted into the snap-fit ​​groove 202. The movable positioning sleeve 4 fixes the extrusion die 2, prevents the extrusion die 2 from rotating, and ensures the firmness of the connection between the extrusion die 2 and the extrusion tube seat 1.

[0037] In this embodiment, the inner side of the rotating adjusting sleeve 5 is in movable contact with the outer side of the movable positioning sleeve 4. The rotating adjusting sleeve 5 has four circumferential sliding holes 502 inside, which are connected to the movable holes 401. The guide block 103 of the extrusion tube seat 1 is slidably connected within the sliding holes 502. The movable positioning sleeve 4 has four force-bearing protrusions 403 circumferentially near its rear end. The rear end of the rotating adjusting sleeve 5 has four force-bearing inclined surfaces 503 circumferentially. The force-bearing protrusions 403 of the movable positioning sleeve 4 are in slidable contact with the force-bearing inclined surfaces 503. Using the above technical solution, when it is necessary to extrude… When the extrusion nozzle 2 connected to the front end of the tube seat 1 is removed, the handle 501 drives the rotating adjustment sleeve 5 to rotate. The force-bearing protrusion 403 contacts the force-bearing inclined surface 503 and is subjected to force. The rotating adjustment sleeve 5 drives the movable positioning sleeve 4 to move backward. The spring 6 gradually contracts, causing the positioning insert 402 to separate from the snap-fit ​​groove 202, releasing the fixation on the extrusion nozzle 2. The extrusion nozzle 2 can then be rotated in the opposite direction to remove it from the front end of the extrusion tube seat 1. When the handle 501 is released, the spring 6 pushes the movable positioning sleeve 4 to move forward and reset. The movable positioning sleeve 4 drives the rotating adjustment sleeve 5 to rotate in the opposite direction and reset.

[0038] In Example 2, based on Example 1, four limiting grooves 104 are arranged in a circumferential shape around the extrusion tube seat 1. The limiting grooves 104 are located between the snap-fit ​​block 102 and the guide block 103. The limiting plug 7 is inserted into the limiting grooves 104 provided in the extrusion tube seat 1, and the front end of the movable positioning sleeve 4 contacts the limiting plug 7. With the above technical solution, when the movable positioning sleeve 4 moves to the last end, the limiting groove 104 is exposed and is flush with the front end of the movable positioning sleeve 4. The limiting plug 7 is inserted into the limiting groove 104, so that the limiting plug 7 contacts the front end of the movable positioning sleeve 4. The limiting plug 7 prevents the movable positioning sleeve 4 from moving forward and resetting, thus freeing up both hands to change the extrusion die 2, which is more user-friendly. When the limiting plug 7 is separated from the limiting groove 104, the movable positioning sleeve 4 is automatically reset by the pushing force of the spring 6, achieving the effect of fixing the extrusion die 2.

[0039] The working principle of this embodiment is as follows: First, the handle 501 drives the rotating adjustment sleeve 5 to rotate. The force-bearing protrusion 403 contacts the force-bearing inclined surface 503 and receives force. The rotating adjustment sleeve 5 drives the movable positioning sleeve 4 to move backward, and the spring 6 gradually contracts. When the movable positioning sleeve 4 moves to the last end, the limiting groove 104 is exposed. The limiting groove 104 is flush with the front end of the movable positioning sleeve 4. The limiting plug 7 is inserted into the limiting groove 104, so that the limiting plug 7 contacts the front end of the movable positioning sleeve 4. The limiting plug 7 prevents the movable positioning sleeve 4 from moving forward and resetting. The extrusion die 2 is connected to the front end of the extrusion tube seat 1. The snap-fit ​​block 102 is connected to the snap-fit ​​groove 202. The extrusion die 2 and the extrusion tube seat 1 are connected together by snap-fit. The high-temperature resistant sealing ring 3 seals the connection between the extrusion die 2 and the extrusion tube seat 1. The extrusion die 2 can be replaced according to the required particle size. When the snap-fit ​​block 102 moves to the innermost end of the snap-fit ​​groove 202, the groove of the snap-fit ​​groove 202 aligns with the positioning plug 402, separating the limiting plug 7 from the limiting groove 104. The movable positioning sleeve 4 moves forward under the influence of the spring 6, so that the positioning plug 402 is inserted into the snap-fit ​​groove 202. The movable positioning sleeve 4 fixes the extrusion die 2, preventing the extrusion die 2 from rotating and ensuring the firmness of the connection between the extrusion die 2 and the extrusion tube seat 1. When it is necessary to replace the extrusion die 2, simply rotate the adjusting sleeve 5 to drive the movable positioning sleeve 4 to move backward, so that the positioning plug 402 is separated from the snap-fit ​​groove 202, releasing the fixation of the extrusion die 2. Then, the limiting plug 7 is re-inserted into the limiting groove 104 to fix the movable positioning sleeve 4. This frees up both hands to rotate the extrusion die 2 in the opposite direction and remove the extrusion die 2 from the front end of the extrusion tube seat 1, making the replacement of the extrusion die 2 easier.

[0040] The following points should be noted in this article:

[0041] 1. The accompanying drawings of the embodiments disclosed herein only relate to the structures involved in the embodiments disclosed herein; other structures can be referred to in a general design.

[0042] 2. Where there is no conflict, the embodiments of this disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.

[0043] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. An extrusion mechanism for plastic pelletization, comprising: The utility model provides an extrusion pipe seat (1), its characterized in be connected with extruder front end discharge port, and the front end of extrusion pipe seat (1) is equipped with extrusion die (2), and the inside of extrusion die (2) is provided with extrusion hole (201) in array, and the specification of extrusion die (2) is according to the diameter of extrusion hole (201), the outside of the front end of extrusion pipe seat (1) is equipped with high temperature resistant sealing ring (3), and high temperature resistant sealing ring (3) is located in extrusion die (2), the outside of extrusion pipe seat (1) is equipped with movable positioning sleeve (4), and the front end of movable positioning sleeve (4) is in contact with extrusion die (2), the outside of extrusion pipe seat (1) is connected with rotary adjusting sleeve (5), and rotary adjusting sleeve (5) is located in the outside of movable positioning sleeve (4), and the outside of rotary adjusting sleeve (5) is provided with handle (501), the outside of extrusion pipe seat (1) is connected with limiting plug-in part (7), and limiting plug-in part (7) is located between extrusion die (2) and movable positioning sleeve (4).

2. The extrusion mechanism for plastic granulation according to claim 1, wherein the front end of the extrusion pipe seat (1) is provided with a ring groove (101) on the outside, and the high temperature resistant sealing ring (3) is located in the ring groove (101), the front end of the extrusion pipe seat (1) is inserted into the inside of the extrusion die (2), and the high temperature resistant sealing ring (3) is in contact with the inside of the extrusion die (2).

3. The extrusion mechanism for plastic granulation according to claim 1, wherein the front end of the extrusion pipe seat (1) is provided with four clamping blocks (102) on the outside, the extrusion die (2) is provided with four clamping grooves (202) on the outside, the clamping grooves (202) are in L shape, and the clamping blocks (102) of the extrusion pipe seat (1) are connected into the clamping grooves (202).

4. The extrusion mechanism for plastic granulation according to claim 3, wherein the movable positioning sleeve (4) is slidingly connected to the outside of the extrusion pipe seat (1), the extrusion pipe seat (1) is provided with four guide blocks (103) on the outside, the movable positioning sleeve (4) is provided with four movable holes (401) on the outside, and the guide blocks (103) of the extrusion pipe seat (1) are slidingly connected into the movable holes (401).

5. The extrusion mechanism for plastic granulation according to claim 3, wherein the front end of the movable positioning sleeve (4) is provided with four positioning plug-in blocks (402) on the outside, and the positioning plug-in blocks (402) are inserted into the clamping grooves (202) of the extrusion die (2).

6. The extrusion mechanism for plastic granulation according to claim 1, wherein the extrusion pipe seat (1) is provided with a spring (6) on the outside, the back end of the spring (6) is in contact with the back end of the extrusion pipe seat (1), and the front end of the spring (6) is in contact with the back end of the movable positioning sleeve (4).

7. The extrusion mechanism for plastic granulation according to claim 4, wherein The inner side of the rotation adjusting sleeve (5) is in movable contact with the outer side of the movable positioning sleeve (4), the inner part of the rotation adjusting sleeve (5) is provided with four sliding holes (502) in a surrounding manner, the sliding holes (502) are communicated with the movable hole (401), and the guide block (103) provided on the extrusion pipe base (1) is slidably connected in the sliding hole (502).

8. The extrusion mechanism for plastic granulation according to claim 1, characterized in that, The outer part of the movable positioning sleeve (4) is provided with four stress protrusions (403) in a surrounding manner close to the rear end, the rear end of the rotation adjusting sleeve (5) is provided with four stress inclined surfaces (503) in a surrounding manner, and the stress protrusions (403) provided on the movable positioning sleeve (4) are in sliding contact with the stress inclined surfaces (503).

9. The extrusion mechanism for plastic granulation according to claim 4, characterized in that, The outer part of the extrusion pipe base (1) is provided with four limiting grooves (104) in a surrounding manner, the limiting grooves (104) are located between the clamping block (102) and the guide block (103), the limiting insert (7) is inserted into the limiting groove (104) provided on the extrusion pipe base (1), and the front end of the movable positioning sleeve (4) is in contact with the limiting insert (7).

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