A knife-adjustable pelletizer and a pelletizing adjustment method

Abstract

The application discloses a cutting grain machine with adjustable blade edge, which comprises an extruder body, a front end plate arranged at the front end of the extruder body, and a cutting grain unit arranged on the front end plate; the cutting grain unit comprises an extrusion disc arranged on the front end plate and used in cooperation with the output end of the extruder body, a plurality of extrusion holes are formed in the extrusion disc, a positioning disc is arranged at the center line position outside the extrusion disc, a power shaft is rotatably arranged on the positioning disc, and two cutting grain assemblies are symmetrically arranged on the power shaft; the cutting grain assembly comprises a cutting grain frame connected with the power shaft, an extension section is arranged at the upper end of a cutting grain blade, the extension section is inserted into the cutting grain frame and locked through locking screws. The application has the beneficial effects of convenient disassembly and assembly, replacement of different types of blades, adaptation to more material characteristics, reduction of debugging time, improvement of production efficiency, improvement of stability, improvement of operation safety, convenience of maintenance, reduction of installation errors, reduction of difficulty and cost of later maintenance, etc.

Description

Technical Field

[0001] This invention relates to the field of pelletizer technology, and more specifically, to a pelletizer with adjustable cutting edge and a pelletizing adjustment method. Background Technology

[0002] Pelletizers are core equipment in the processing of polymer materials such as plastics, rubber, and chemical fibers. They are mainly used to cut continuous materials extruded from extruders into uniform granules, providing raw materials for subsequent injection molding, blow molding, and other processing steps. Their core working logic is to achieve continuous and large-scale granulation through the process of material extrusion, cutting, and granule output. They are widely used in the production chains of products such as plastic films, pipes, profiles, and chemical fibers. However, in practical applications, existing pelletizers suffer from several drawbacks. First, the blade spacing between the pelletizing blades and the extrusion disc is often fixed, making precise adjustment impossible according to production needs. Second, when processing materials of different particle sizes, the entire pelletizing unit must be replaced or the equipment must be re-adjusted, resulting in cumbersome operation. Furthermore, most pelletizers are cumbersome and have low adjustment precision, making it difficult to adapt to the pelletizing requirements of various material specifications. On the other hand, most pelletizers are only equipped with a single pelletizing unit. When the pelletizing blades are worn, clogged, or require maintenance, the machine must be stopped for repair or replacement. The downtime process not only consumes a lot of time but also leads to production interruption, seriously affecting overall production efficiency and increasing production and operating costs. Moreover, some pelletizers lack reliable positioning structures for components such as the extrusion disc and pelletizing blades. During long-term operation, problems such as loosening and misalignment can easily occur, resulting in a decrease in the fitting precision between the blades and the extrusion disc, uneven pellet size, and affecting product quality. At the same time, there may be power loss or instability during power transmission, further reducing the reliability of equipment operation.

[0003] Therefore, those skilled in the art are dedicated to providing a pelletizer with an adjustable cutting edge and a pelletizing adjustment method that can effectively solve the above-mentioned technical problems. Summary of the Invention

[0004] To achieve the above objectives, the present invention provides a pelletizer with an adjustable cutting edge, comprising an extruder body, wherein a front end plate is provided at the front end of the extruder body, and a pelletizing unit is provided on the front end plate;

[0005] The pelletizing unit includes an extrusion disc mounted on the front end plate and used in conjunction with the output end of the extruder body. The extrusion disc has a plurality of extrusion holes. A positioning disc is provided at the center line position of the outer side of the extrusion disc. A power shaft is rotatably mounted on the positioning disc. Two pelletizing components are symmetrically arranged on the power shaft.

[0006] The pelletizing assembly includes a pelletizing frame connected to the power shaft, and an extension section is provided at the upper end of the pelletizing blade. The extension section is inserted into the pelletizing frame and locked by a locking screw.

[0007] Furthermore, there are two pelletizing units, which are evenly distributed along the length of the front end plate. The lower end of the front end plate slides on the guide rail. By sliding the front end plate along the length of the guide rail, the two pelletizing units can be switched to work with the extruder body. The inner wall of the extrusion orifice is coated with a titanium nitride coating with a thickness of 3-5 μm to improve the wear resistance of the extrusion orifice and the material demolding effect, and to avoid clogging caused by material adhesion.

[0008] Furthermore, a limiting groove is formed at the upper end of the guide rail, and two roller guide grooves are formed in the limiting groove. The roller guide grooves and the limiting groove extend along the length direction of the guide rail and penetrate the guide rail. End caps are provided at both ends of the guide rail, and each end cap is detachably connected to both ends of the guide rail by screws. Several guide wheels are provided at the lower end of the front end plate. Each guide wheel extends along the length direction of the front end plate and is located in each of the roller guide grooves. Handles are provided on both sides of the front end plate.

[0009] Furthermore, a guide limiting mechanism is provided at the upper end of the front half of the extruder body;

[0010] The guiding and limiting mechanism includes a positioning seat, the lower end of which is connected to the extruder body. The upper end of the positioning seat is provided with a top plate integrally formed therewith and extending outward. The lower end of the top plate is provided with a limiting guide rod. The upper end of the front end plate is provided with a limiting strip. The upper end of the limiting strip has a slot. The limiting guide rod is embedded in the slot. The front end plate is connected and guided to the limiting guide rod through the slot.

[0011] Furthermore, a positioning circular opening is provided on the front end plate, and a limiting ring is provided at the positioning circular opening. Several positioning posts are arranged in a circular array around the center line of the positioning circular opening on the inner side of the limiting ring. The front edge of the extrusion disk fits against the limiting ring and passes through each of the positioning posts, and is positioned by each first locking nut.

[0012] Furthermore, the front end plate is provided with a plurality of first limiting screw holes, and the front end of the extruder body is provided with a plurality of second limiting screw holes that cooperate with each of the first limiting screw holes. The fastening screws position the front end plate and the extruder body by passing through the first limiting screw holes and the second limiting screw holes.

[0013] Furthermore, a positioning groove is provided along the axial direction of the power shaft, a central seat is fitted on the power shaft, a central hole is provided on the central seat, and a positioning strip that cooperates with the positioning groove is provided on the inner wall of the central hole. Each of the pelletizing components is respectively arranged on both sides of the central seat.

[0014] Furthermore, a positioning rod is provided at the front end of the power shaft, and an outer cover is sleeved on the positioning rod. The outer cover is limited by a second locking nut, and an outer cover is provided on the inner side of the outer cover. A spring sleeved on the power shaft is provided between the center seat and the outer cover. The outer side of the spring is located inside the outer cover, and the spring is in a pre-compressed state, continuously applying axial preload to the center seat.

[0015] Furthermore, the pelletizing assembly includes a pelletizing frame with a sliding part, which is slidably disposed on one side of the center seat. The contact surface between the sliding part and the center seat is provided with a plurality of ball grooves, in which wear-resistant balls are embedded. The balls protrude 0.3-0.5mm from the contact surface of the sliding part, reducing sliding friction between the sliding part and the center seat, improving adjustment smoothness and component service life. A cavity is opened on the outer side of the sliding part, and the inner side of the connecting part is inserted into the cavity. A plurality of first adjustment screw holes are opened on the connecting part.

[0016] A fixed seat is provided on one side of the central seat, and a positioning screw is provided on the fixed seat. The positioning screw passes through the second adjusting screw hole and the first adjusting screw hole in sequence. The second adjusting screw hole is opened on the sliding part.

[0017] An L-shaped connecting block is provided on the outer side of the connecting part, and a horizontal plate is provided on the L-shaped connecting block. The extension section of the pelletizing blade is inserted into the horizontal plate, and the fit gap between the extension section and the horizontal plate is 0.02-0.05mm. It is locked and fixed by locking screws. The parallelism error between the cutting edge of the pelletizing blade and the end face of the extrusion disc is ≤0.01mm. The pelletizing blade is provided with reinforcing ribs.

[0018] The adjustable cutting edge pelletizing method involves a front-end plate sliding within a guide rail's roller groove via a lower guide wheel. Pushing the handle allows the plate to slide along the length of the guide rail. During this sliding process, the groove of the upper limit strip on the front-end plate engages with the limit guide rod of the guide limiting mechanism. When the target pelletizing unit aligns with the extruder body's output end, a fastening screw passes through the first and second limit screw holes to lock the front-end plate to the extruder body. The extension section of the pelletizing blade is inserted into the horizontal plate of the L-shaped connecting block and secured with a locking screw. Rotating the positioning screw, which passes through the second adjusting screw hole of the fixed seat and the first adjusting screw hole of the connecting part, drives the connecting part to move within the cavity of the sliding part. The sliding part slides along the side of the center seat, causing the pelletizing blade to move closer to or further away from the extrusion disc, thus adjusting the blade spacing. A spring consistently provides preload. The power shaft, through a positioning groove and engaging with the positioning strip of the center seat, transmits power to the pelletizing assemblies on both sides. The material output from the extruder body is extruded through the extrusion holes of the extrusion disc, and the rotating pelletizing blade cuts the material, completing the pelletizing process.

[0019] The present invention has the following beneficial effects:

[0020] 1. This invention drives the connecting part to move by positioning screw, which moves the pelletizing blade closer to or away from the extrusion disc. The blade spacing can be precisely adjusted to meet the pelletizing requirements of materials with different particle sizes. The pelletizing blade is fixed by extension section and locking screw, which is convenient to disassemble and install, and easy to replace different types of blades to adapt to more material characteristics.

[0021] 2. The two pelletizing components move laterally through the front end plate and work in conjunction with the extruder body. When cleaning and maintaining one of the pelletizing components, the overall operation is not affected, reducing debugging time and improving production efficiency.

[0022] 3. The extrusion disc is fixed by the positioning pin and the locking nut, and is positioned in conjunction with the screw holes of the front end plate and the extruder body to ensure the fitting accuracy with the blade and uniform pellet size; the spring provides continuous preload, and the power shaft transmits power through the positioning groove and the positioning bar, so there is no loosening during operation, which effectively improves stability;

[0023] 4. The outer cover and cover protect the internal components, preventing material splashing or personnel contact with moving parts, thus improving operational safety;

[0024] 5. Handles are provided on both sides of the front panel for easy sliding switching; all components are detachably connected by screw holes, nuts, etc., which has the advantages of convenient inspection and maintenance, reducing installation errors, and reducing the difficulty and cost of later maintenance. Attached Figure Description

[0025] Figure 1 This is a structural schematic diagram of a specific embodiment of the present invention.

[0026] Figure 2 This is a three-dimensional structural diagram of the present invention.

[0027] Figure 3 yes Figure 2 A magnified schematic diagram of the structure at point A in the middle.

[0028] Figure 4 This is a schematic diagram of the guide and limit mechanism.

[0029] Figure 5 This is a side view of the front-end board.

[0030] Figure 6 yes Figure 5 A magnified schematic diagram of the structure at point B in the middle.

[0031] Figure 7 This is a partial structural diagram of the front-end board.

[0032] Figure 8 yes Figure 7 A schematic diagram of a structure without an extrusion disc.

[0033] Figure 9This is a top view of the front-end board.

[0034] Figure 10 yes Figure 9 A magnified schematic diagram of the structure at point C.

[0035] Figure 11 This is a schematic diagram of the pelletizing unit.

[0036] Figure 12 yes Figure 11 A magnified schematic diagram of the structure at point D in the middle.

[0037] Figure 13 This is a structural diagram of components such as the positioning disc.

[0038] Figure 14 This is a structural diagram of the outer cover and outer casing.

[0039] Figure 15 This is a schematic diagram of the central base.

[0040] Figure 16 This is a schematic diagram of the pelletizer structure in this invention.

[0041] The attached diagram lists the components represented by each number as follows:

[0042] 1. Extruder body; 2. Front end plate; 3. Pelletizing unit; 5. Extrusion disc; 6. Positioning disc; 7. Drive shaft; 8. Pelletizing assembly; 9. Pelletizer frame; 10. Pelletizing blade; 11. Extension section; 12. Locking screw; 20. Extrusion orifice; 21. Guide rail; 22. Limiting groove; 23. Roller guide groove; 26. End cap; 27. Guide wheel; 30. Handle; 31. Guide limiting mechanism; 32. Positioning seat; 33. Top plate; 35. Limiting guide rod; 36. Limiting strip; 37. Slot; 38. Positioning round opening; 3 9. Limiting ring; 50. Positioning pin; 51. First locking nut; 52. First limiting screw hole; 55. Fastening screw; 56. Positioning groove; 57. Center seat; 58. Center hole; 59. Positioning strip; 60. Positioning rod; 61. Outer cover; 62. Second locking nut; 63. Outer cover; 65. Spring; 66. Sliding part; 67. Connecting part; 68. First adjusting screw hole; 69. Fixed seat; 70. Positioning screw; 71. Second adjusting screw hole; 72. L-shaped connecting block; 73. Horizontal plate; 75. Reinforcing rib. Detailed Implementation

[0043] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0044] In the description of this invention, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0045] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "setting," and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral 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 connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0046] like Figures 1 to 16 As shown, a pelletizer with an adjustable cutting edge includes an extruder body 1, a front end plate 2 is provided at the front end of the extruder body 1, and a pelletizing unit 3 is provided on the front end plate 2.

[0047] The pelletizing unit 3 includes an extrusion disc 5 mounted on the front end plate 2 and used in conjunction with the output end of the extruder body 1. The extrusion disc 5 has a plurality of extrusion holes 20. A positioning disc 6 is provided at the center line position of the outer side of the extrusion disc 5. A power shaft 7 is rotatably mounted on the positioning disc 6. Two pelletizing components 8 are symmetrically arranged on the power shaft 7.

[0048] The pelletizing assembly 8 includes a pelletizing frame 9 connected to the power shaft 7. The upper end of the pelletizing blade 10 is provided with an extension section 11, which is inserted into the pelletizing frame 9 and locked by a locking screw 12.

[0049] There are two pelletizing units 3, and each pelletizing unit 3 is evenly distributed along the length direction of the front end plate 2. The lower end of the front end plate 2 is slidably mounted on the guide rail 21. By sliding the front end plate 2 along the length direction of the guide rail 21, the two pelletizing units 3 can be switched to work with the extruder body 1. The inner wall of the extrusion orifice 20 is coated with titanium nitride with a coating thickness of 3-5 μm to improve the wear resistance of the extrusion orifice and the material demolding effect, and to avoid clogging caused by material adhesion.

[0050] The upper end of the guide rail 21 has a limiting groove 22, and two roller guide grooves 23 are formed in the limiting groove 22. The roller guide grooves 23 and the limiting groove 22 extend along the length direction of the guide rail and pass through the guide rail 21. Both ends of the guide rail 21 are provided with end caps 26. Each end cap 26 is detachably connected to both ends of the guide rail 21 by screws. The lower end of the front end plate 2 is provided with a plurality of guide wheels 27. Each guide wheel 27 extends along the length direction of the front end plate 2 and is located in each of the roller guide grooves 23. Both sides of the front end plate 2 are provided with handles 30.

[0051] The upper part of the front half of the extruder body 1 is provided with a guide and limiting mechanism 31;

[0052] The guiding and limiting mechanism 31 includes a positioning seat 32. The lower end of the positioning seat 32 is connected to the extruder body 1. The upper end of the positioning seat 32 is provided with a top plate 33 integrally formed with it and extending outward. The lower end of the top plate 33 is provided with a limiting guide rod 35. The upper end of the front end plate 2 is provided with a limiting strip 36. The upper end of the limiting strip 36 is provided with a slot 37. The limiting guide rod 35 is embedded in the slot 37. The front end plate 2 is connected and guided to the limiting guide rod 35 through the slot 37.

[0053] The front end plate 2 has a positioning opening 38, and a limiting ring 39 is provided at the positioning opening 38. Several positioning posts 50 are arranged in a circular array around the center line of the positioning opening 38 on the inner side of the limiting ring 39. The front edge of the extrusion disk 5 is in contact with the limiting ring 39 and passes through each of the positioning posts 50, and is positioned by each of the first locking nuts 51.

[0054] The front end plate 2 is provided with a plurality of first limiting screw holes 52, and the front end of the extruder body 1 is provided with a plurality of second limiting screw holes that cooperate with each of the first limiting screw holes 52. The fastening screws 55 position the front end plate 2 and the extruder body 1 by passing through the first limiting screw holes 52 and the second limiting screw holes.

[0055] A positioning groove 56 is provided along the axial direction of the power shaft 7. A center seat 57 is sleeved on the power shaft 7. A center hole 58 is provided on the center seat 57. A positioning strip 59 that cooperates with the positioning groove 56 is provided on the inner wall of the center hole 58. Each pelletizing component 8 is respectively arranged on both sides of the center seat 57.

[0056] A positioning rod 60 is provided at the front end of the power shaft 7. An outer cover 61 is sleeved on the positioning rod 60. The outer cover 61 is limited by a second locking nut 62. An outer cover 63 is provided on the inner side of the outer cover 61. A spring 65 is sleeved on the power shaft 7 between the center seat 57 and the outer cover 61. The outer side of the spring 65 is located inside the outer cover 63. The spring 65 is in a pre-compressed state and continuously applies axial preload to the center seat 57.

[0057] The pelletizing assembly 8 includes a pelletizing frame 9 including a sliding part 66. The sliding part 66 is slidably disposed on one side of the center seat 57. The contact surface between the sliding part 66 and the center seat 57 is provided with several ball grooves. Wear-resistant balls are embedded in the ball grooves. The balls protrude 0.3-0.5mm from the contact surface of the sliding part, reducing the sliding friction between the sliding part and the center seat, improving the smoothness of adjustment and the service life of the component. A cavity is opened on the outer side of the sliding part 66, and the inner side of the connecting part 67 is inserted into the cavity. Several first adjusting screw holes 68 are opened on the connecting part 67.

[0058] A fixed seat 69 is provided on one side of the central seat 57. A positioning screw 70 is provided on the fixed seat 69. The positioning screw 70 passes through the second adjusting screw hole 71 and the first adjusting screw hole 68 in sequence. The second adjusting screw hole 71 is opened on the sliding part 66.

[0059] An L-shaped connecting block 72 is provided on the outer side of the connecting part 67. A horizontal plate 73 is provided on the L-shaped connecting block 72. The extension section 11 of the pelletizing blade 10 is inserted into the horizontal plate 73. The fit gap between the extension section 11 and the horizontal plate 73 is 0.02-0.05mm. It is locked and fixed by locking screws 12. The parallelism error between the cutting edge of the pelletizing blade 10 and the end face of the extrusion disc 5 is ≤0.01mm. A reinforcing rib 75 is provided on the pelletizing blade 10.

[0060] The pelletizing adjustment method with adjustable cutting edge involves the front plate 2 sliding within the roller guide groove 23 of the guide rail 21 via the lower guide wheel 27. Pushing the handle 30 allows it to slide along the length of the guide rail. During sliding, the slot 37 of the upper limiting strip 36 of the front plate 2 engages with the limiting guide rod 35 of the guiding limiting mechanism 31 for guidance. When the target pelletizing unit 3 is aligned with the output end of the extruder body 1, the front plate 2 and the extruder body 1 are positioned and locked by fastening screws 55 passing through the first and second limiting screw holes. The extension section 11 of the pelletizing blade 10 is inserted into the horizontal plate 73 of the L-shaped connecting block 72 and locked by locking screws 12. The positioning screw 70 is fixed and rotated, passing through the second adjusting screw hole 71 of the fixed seat 69 and the first adjusting screw hole 68 of the connecting part 67, driving the connecting part 67 to move within the cavity of the sliding part 66; the sliding part 66 slides along the side of the center seat 57, causing the pelletizing blade 10 to move closer to or further away from the extrusion disc 5, thereby adjusting the blade spacing. The spring 65 always provides preload. The power shaft 7, through the positioning groove 56, cooperates with the positioning strip 59 of the center seat 57 to transmit power to the pelletizing assemblies 8 on both sides. The material output from the extruder body 1 is extruded through the extrusion hole 20 of the extrusion disc 5, and the rotating pelletizing blade 10 cuts the material, completing the pelletizing. The outer cover 61 is fixed to the positioning rod 60 by the second locking nut 62, and the outer cover 63 protects the internal components. The extrusion disc 5 is fixed to the positioning round opening 38 of the front end plate 2 by the positioning post 50 and the first locking nut 51 to ensure the fitting accuracy with the blade.

[0061] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A pelletizer with adjustable cutting edge, comprising an extruder body (1), characterized in that: The front end of the extruder body (1) is provided with a front end plate (2), and a pelletizing unit (3) is provided on the front end plate (2). The pelletizing unit (3) includes an extrusion disc (5) mounted on the front end plate (2) and used in conjunction with the output end of the extruder body (1). The extrusion disc (5) has a plurality of extrusion holes (20). A positioning disc (6) is provided at the center line of the outer side of the extrusion disc (5). A power shaft (7) is rotatably provided on the positioning disc (6). Two pelletizing components (8) are symmetrically arranged on the power shaft (7). The pelletizing assembly (8) includes a pelletizing frame (9) connected to the power shaft (7), and an extension section (11) is provided at the upper end of the pelletizing blade (10). The extension section (11) is inserted into the pelletizing frame (9) and locked by a locking screw (12).

2. The pelletizer with adjustable blade edge as described in claim 1, characterized in that: There are two pelletizing units (3). Each pelletizing unit (3) is evenly distributed along the length direction of the front end plate (2). The lower end of the front end plate (2) is slidably mounted on the guide rail (21). By sliding the front end plate (2) along the length direction of the guide rail (21), the two pelletizing units (3) can be switched to work with the extruder body (1). The inner wall of the extrusion hole (20) is coated with titanium nitride, and the coating thickness is 3-5 μm.

3. The pelletizer with adjustable cutting edge as described in claim 2, characterized in that: The upper end of the guide rail (21) is provided with a limiting groove (22), and two roller guide grooves (23) are provided in the limiting groove (22). The roller guide grooves (23) and the limiting grooves (22) extend along the length direction of the guide rail and pass through the guide rail (21). Both ends of the guide rail (21) are provided with end caps (26). Each end cap (26) is detachably connected to both ends of the guide rail (21) by screws. The lower end of the front end plate (2) is provided with a number of guide wheels (27). Each guide wheel (27) extends along the length direction of the front end plate (2) and is located in each of the roller guide grooves (23). Both sides of the front end plate (2) are provided with handles (30).

4. The pelletizer with adjustable cutting edge as described in claim 3, characterized in that: The upper part of the front half of the extruder body (1) is provided with a guide limiting mechanism (31). The guide limiting mechanism (31) includes a positioning seat (32), the lower end of which is connected to the extruder body (1). The upper end of the positioning seat (32) is provided with a top plate (33) integrally formed therewith and extending outward. The lower end of the top plate (33) is provided with a limiting guide rod (35). The upper end of the front end plate (2) is provided with a limiting strip (36). The upper end of the limiting strip (36) is provided with a slot (37). The limiting guide rod (35) is embedded in the slot (37). The front end plate (2) is connected and guided to the limiting guide rod (35) through the slot (37).

5. The pelletizer with adjustable cutting edge as described in claim 4, characterized in that: The front end plate (2) is provided with a positioning round opening (38), and a limiting ring (39) is provided at the positioning round opening (38). Several positioning rings (39) are arranged in a circular array around the center line of the positioning round opening (38) on the inner side of the limiting ring (39) and positioned on the positioning post (50). The front edge of the extrusion disk (5) is in contact with the limiting ring (39) and passes through each of the positioning posts (50), and is positioned by each first locking nut (51).

6. The pelletizer with adjustable cutting edge as described in claim 5, characterized in that: The front end plate (2) is provided with a plurality of first limiting screw holes (52), and the front end of the extruder body (1) is provided with a plurality of second limiting screw holes that cooperate with each of the first limiting screw holes (52). The fastening screw (55) positions the front end plate (2) and the extruder body (1) by passing through the first limiting screw holes (52) and the second limiting screw holes.

7. The pelletizer with adjustable cutting edge as described in claim 6, characterized in that: A positioning groove (56) is provided along the axial direction of the power shaft (7). A center seat (57) is sleeved on the power shaft (7). A center hole (58) is provided on the center seat (57). A positioning strip (59) that cooperates with the positioning groove (56) is provided on the inner wall of the center hole (58). Each pelletizing component (8) is respectively arranged on both sides of the center seat (57).

8. The pelletizer with adjustable cutting edge as described in claim 7, characterized in that: A positioning rod (60) is provided at the front end of the power shaft (7). An outer cover (61) is sleeved on the positioning rod (60). The outer cover (61) is limited by a second locking nut (62). An outer cover (63) is provided on the inner side of the outer cover (61). A spring (65) is sleeved on the power shaft (7) between the center seat (57) and the outer cover (61). The outer side of the spring (65) is located inside the outer cover (63). The spring (65) is in a pre-compressed state and continuously applies axial preload to the center seat (57).

9. The pelletizer with adjustable cutting edge as described in claim 8, characterized in that: The pelletizing assembly (8) includes a pelletizing frame (9) including a sliding part (66). The sliding part (66) is slidably disposed on one side of the center seat (57). The contact surface between the sliding part (66) and the center seat (57) is provided with several ball grooves. Wear-resistant balls are embedded in the ball grooves. The balls protrude 0.3-0.5mm from the contact surface of the sliding part. A cavity is opened on the outer side of the sliding part (66). The inner side of the connecting part (67) is inserted into the cavity. Several first adjusting screw holes (68) are opened on the connecting part (67). A fixed seat (69) is provided on one side of the center seat (57), and a positioning screw (70) is provided on the fixed seat (69). The positioning screw (70) passes through the second adjusting screw hole (71) and the first adjusting screw hole (68) in sequence. The second adjusting screw hole (71) is opened on the sliding part (66). An L-shaped connecting block (72) is provided on the outside of the connecting part (67), and a horizontal plate (73) is provided on the L-shaped connecting block (72). The extension section (11) of the pelletizing blade (10) is inserted into the horizontal plate (73). The fitting gap between the extension section (11) and the horizontal plate (73) is 0.02-0.05mm. It is locked and fixed by a locking screw (12). A reinforcing rib (75) is provided on the pelletizing blade (10).

10. The pelletizing adjustment method with adjustable cutting edge as described in claim 9, characterized in that: The front plate (2) slides in the roller guide groove (23) of the guide rail (21) via the lower guide wheel (27). Pushing the handle (30) allows it to slide along the length of the guide rail. During the sliding process, the slot (37) of the upper limit strip (36) of the front plate (2) cooperates with the limit guide rod (35) of the guide limit mechanism (31) for guidance. When the target pelletizing unit (3) is aligned with the output end of the extruder body (1), the front plate (2) and the extruder body (1) are positioned and locked by fastening screws (55) passing through the first limit screw hole (52) and the second limit screw hole. The extension section (11) of the pelletizing blade (10) is inserted into the horizontal plate (73) of the L-shaped connecting block (72) and locked by locking screws (12). Rotating the fixed plate The positioning screw (70) passes through the second adjusting screw hole (71) of the fixed seat (69) and the first adjusting screw hole (68) of the connecting part (67), driving the connecting part (67) to move in the cavity of the sliding part (66); the sliding part (66) slides along the side of the center seat (57), driving the pelletizing blade (10) to move closer to or further away from the extrusion disc (5) to achieve blade spacing adjustment; the spring (65) always provides preload; the power shaft (7) cooperates with the positioning strip (59) of the center seat (57) through the positioning groove (56) to transmit power to the pelletizing assemblies (8) on both sides; the material output from the extruder body (1) is extruded through the extrusion hole (20) of the extrusion disc (5); the rotating pelletizing blade (10) cuts the material to complete pelletizing.

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