A plastic underwater pelletizer for producing modified plastic particles

Abstract

The present invention discloses a plastic underwater pelletizer for producing modified plastic pellets, which relates to the technical field of plastic processing equipment and comprises: a workbench and a plastic extruder mounted on top of the workbench, a mold sleeve mounted on one end of the plastic extruder, and a pelletizing template mounted inside the mold sleeve. The present invention provides a switching auxiliary device to drive a vertically rotating rotating block to drive the cutting blade to rotate 90 degrees to fit the end face of the pelletizing template. At the same time, the rotating wheel at the position of the cutting blade to be replaced moves from the highest point of the arched track to the lowest point, thereby causing a power spring to drive the straight rack to reset, causing the rotating block originally in a horizontal position to drive the cutting blade to be replaced to rotate to a vertical position. Since multiple cutting blades are provided, the cutting blades can be automatically replaced multiple times by this reciprocating motion, without the need for staff to disassemble the equipment for replacement, thereby improving the overall practicality of the device.

Description

Technical Field

[0001] The invention relates to the technical field of plastic processing equipment, in particular to an underwater plastic pelletizer for producing modified plastic particles. Background Art

[0002] Modified plastics are plastic products that are modified by filling, blending, reinforcing and other methods based on general plastics and engineering plastics to improve their flame retardancy, strength, impact resistance, toughness and other properties. The extruder is the most widely used equipment in polymer processing. After the polymer is mixed with various additives, it is fed into the extruder to be melted and further mixed evenly. Multiple strips are formed through a multi-hole die and then cut into pellets. The cutting process can be divided into hot cutting and cold cutting. Among them, hot cutting is to cool the strips with air or water after leaving the die and cut them with a blade. The underwater pelletizer is a plastic pellet hot cutting equipment commonly used in the plastic granulation industry.

[0003] According to the announcement number "CN113427663B" published on the China Patent Network, it is a "plastic underwater pelletizer" comprising a frame, a slide slidably connected to the frame, a shaft seat provided on the slide, a core shaft rotatably connected in the shaft seat, a spline provided at one end of the core shaft, a key sleeve provided on the spline, a cutter provided at the end of the key sleeve, a first fixing ring provided on the key sleeve, a support plate provided on the side wall of the shaft seat for the core shaft to pass through, a second fixing ring rotatably connected to the side wall of the support plate via a rotating member, a spring connected between the second fixing ring and the first fixing ring, a drive motor for driving the core shaft to rotate mounted on the end of the shaft seat away from the cutter, a drive member for driving the slide to move provided on the frame, a sealing cover provided on the frame facing the cutter, a die head provided in the sealing cover, a water inlet pipe, a water outlet pipe and a locking seal provided on the sealing cover. This application has the effect of improving the quality of pellet molding.

[0004] Although the above patent can improve the quality of pellet molding, the existing underwater plastic pelletizer generally extrudes the plastic through an extruder and then extrudes it through a pelletizing template, and then drives the cutter head to pelletize the plastic extruded from the pelletizing template by rotating the cutter head. However, during long-term use, since the cutter is always tightly attached to the pelletizing template and rotates, there is a large friction between the two, which easily causes large wear. In order to improve the quality of the product after pelletizing, the cutter and the pelletizing template need to be replaced frequently. Since the replacement of the cutter and the pelletizing template requires a long shutdown time and the equipment needs to be disassembled, a lot of time is wasted and the cutter cannot be automatically replaced inside the equipment, thereby reducing the efficiency of pelletizing. For this reason, we provide a plastic underwater pelletizer for the production of modified plastic pellets to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a plastic underwater pelletizer for the production of modified plastic particles in order to solve the problem that frequent replacement of cutters requires long downtime, replacement is troublesome, and the cutters cannot be automatically replaced inside the equipment.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a plastic underwater pelletizer for producing modified plastic particles, comprising: a workbench and a plastic extruder installed on the top of the workbench, one end of the plastic extruder is installed with a mold sleeve, and a pelletizing template is installed inside the mold sleeve; a hydraulic cylinder, the hydraulic cylinder is fixedly connected to the top of the workbench, the output end of the hydraulic cylinder is connected to a cutting sleeve, an auxiliary connecting mechanism for connecting the cutting sleeve and the mold sleeve is provided between the two, one end of the cutting sleeve is installed with a first drive motor, the output end of the first drive motor is connected to a rotating rod, and one end of the rotating rod passes through the interior of the cutting sleeve and is rotatably connected to the cutting sleeve. , one end of the rotating rod is fixedly connected to a rotating disk, and the outer wall of the rotating disk is provided with multiple cutting blades; a switching assistant is located between the rotating disk and the cutting blade, and is used to switch the cutting blade for use, and the switching assistant includes a plurality of rotating blocks arranged on the inner side of the rotating disk, and the rotating block is fixedly connected to the cutting blade, and the internal rotation of the rotating disk is connected to a rotating shaft, and one end of the rotating shaft passes through the inner side of the rotating disk and is located on both sides of the rotating block, and an adaptive adjustment member is provided between the rotating shaft and the rotating block for making the cutting blade close to the end of the pelletizing template; a shielding mechanism is located on the outer wall of the rotating rod, and is used to shield the cutting blade when it is not in use.

[0007] As a further solution of the present invention: the auxiliary connecting mechanism includes a sealing groove opened at the end of the cutting sleeve, the end of the mold sleeve is fixedly connected with an annular sealing plug, and the annular sealing plug matches the sealing groove, the outer wall of the cutting sleeve is installed with a vacuum pump, the input end of the vacuum pump is connected to a connecting pipe, and one end of the connecting pipe passes through the interior of the cutting sleeve and communicates with the sealing groove.

[0008] As a further solution of the present invention: the switching assistant also includes a second spur gear fixedly connected to the outer wall of the rotating shaft, the interior of the rotating disk is fixedly connected to a limiting sleeve, the inner side of the limiting sleeve is slidably connected to a second T-shaped block, the bottom of the second T-shaped block is fixedly connected to a spur rack meshing with the second spur gear, one end of the spur rack is fixedly connected to a power spring, and one end of the power spring is fixedly connected to the rotating disk, and the interior of the rotating disk is provided with a power assist component for moving the spur rack.

[0009] As a further solution of the present invention: the power assist group includes a connecting frame fixedly connected to the inner side of the spur rack, one end of the connecting frame is rotatably connected to a rotating wheel, the inside of the rotating disk is rotatably connected to a power flange, the bottom of the power flange is fixedly connected to a spur gear ring, the inside of the rotating disk is fixedly connected to a connecting seat, a second drive motor is installed on the top of the connecting seat, and the output end of the second drive motor is connected to a first spur gear meshing with the spur gear ring, and a plurality of arched tracks are provided on the outside of the power flange.

[0010] As a further solution of the present invention: the shielding mechanism includes a connecting shell fixedly connected to the outer wall of the rotating rod, a micro electric push rod is installed inside the connecting shell, and the output end of the micro electric push rod passes through the outside of the connecting shell and is fixedly connected to a ring, and the bottom of the ring is rotatably connected to a protective sleeve.

[0011] As a further solution of the present invention: a plurality of rectangular sliding rods are fixedly connected to the top of the power boss, and one end of the plurality of rectangular sliding rods passes through the outside of the protective sleeve and is slidably connected to the protective sleeve.

[0012] As a further solution of the present invention: the adaptive adjustment member includes a first T-shaped block slidably connected to the end of the rotating shaft, an auxiliary spring is fixedly connected to the inner side of the first T-shaped block, and one end of the auxiliary spring is fixedly connected to the rotating shaft, and one side of the first T-shaped block is fixedly connected to the rotating block.

[0013] As a further solution of the present invention: the adaptive adjustment part also includes a rectangular sleeve fixedly connected to the top end of the protective sleeve, the interior of the rectangular sleeve is slidably connected to a clamping rod, the top of the clamping rod is fixedly connected to a connecting spring, and one end of the connecting spring is fixedly connected to the rectangular sleeve.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] When the cutting blade needs to be replaced, the second driving motor can be started intermittently, and the output end of the second driving motor drives the first spur gear to rotate circumferentially, thereby driving the spur gear ring to drive the power flange to rotate circumferentially. When the multiple arched tracks on the outer wall of the power flange are in contact with a rotating wheel respectively, the rotating wheel moves from the lowest point of the arched track to the highest point, the second driving motor stops running, and in this process, the rotating wheel pushes the spur rack to move in the direction of the second spur gear, thereby driving the vertically rotating rotating block to drive the cutting blade to rotate ninety degrees and fit into the end face of the pelletizing template. At the same time, the rotating wheel at the position of the cutting blade that needs to be replaced moves from the highest point of the arched track to the lowest point, so that the power spring drives the spur rack to reset, so that the rotating block originally in the horizontal position drives the cutting blade that needs to be replaced to rotate to the vertical position. Since there are multiple cutting blades, the cutting blades can be automatically replaced multiple times in this reciprocating manner, without the need for staff to disassemble the equipment for replacement, thereby improving the overall practicality of the device;

[0016] 2. By setting up a shielding mechanism, when the cutting blade needs to be replaced after being used for a long time, the micro electric push rod is started, and the output end of the micro electric push rod drives the ring to move the protective sleeve away from the cutting blade, so that the cutting blade inside the protective sleeve can be revealed. The above steps are reversed to shield the unused cutting blade, thereby preventing the unused cutting blade from colliding with the cut plastic again during the circular rotation of the rotating disk and affecting its shape, thereby ensuring the quality of the plastic molding after cutting;

[0017] 3. By setting an adaptive adjustment part, when the cutting blade is replaced, the micro electric push rod pushes the protective sleeve to reset and shield the vertical cutting blade. The rectangular sleeve drives the pressing rod to move downward. When the pressing rod contacts the horizontally rotating rotating block, the pelletizing template will be worn due to long-term friction with the cutting blade. When there is a gap between the new cutting blade and the end face of the pelletizing template after replacement, the pressing rod pushes the rotating block under the action of the connecting spring to drive the cutting blade to move toward the end face of the pelletizing template, so that the cutting blade is closely attached to the end face of the pelletizing template, thereby ensuring the tightness between the cutting blade and the pelletizing template after replacement, thereby improving the quality of subsequent plastic cutting and molding;

[0018] 4. By arranging the cooperation of parts such as the rectangular slide bar, when the power cam rotates in a circle, the protective sleeve will be driven to rotate in a circle through the rectangular slide bar, thereby driving the clamping rod to rotate in a circle through the rectangular sleeve. After the power cam stops rotating, the clamping rod can be adjusted to the top of the rotating block that is in a horizontal position, so as to facilitate the position calibration of the switched cutting blade, thereby improving the overall practicality of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention;

[0020] Figure 2 This is a schematic diagram of the internal structure of the cutting sleeve of the present invention;

[0021] Figure 3 For the present invention Figure 2 Enlarged view of point A in the middle;

[0022] Figure 4 This is a schematic diagram of the inner structure of the protective sleeve of the present invention;

[0023] Figure 5 It is a schematic structural diagram of the rotating disk of the present invention;

[0024] Figure 6 For the present invention Figure 5 Enlarged view of point B in the middle;

[0025] Figure 7 This is a schematic diagram of the inner structure of the rotating disk of the present invention;

[0026] Figure 8 This is a schematic diagram of the power flange structure of the present invention;

[0027] Figure 9 For the present invention Figure 8 Enlarged view of point C in the middle;

[0028] Figure 10 It is a schematic diagram of the structure of the rotating block of the present invention;

[0029] Figure 11 It is a cross-sectional view of a rectangular sleeve of the present invention.

[0030] Figure: 1. Workbench; 2. Plastic extruder; 3. First drive motor; 4. Mold sleeve; 5. Cutting sleeve; 6. Hydraulic cylinder; 7. Pelletizing plate; 8. Rotating rod; 9. Connecting shell; 10. Rectangular slide bar; 11. Circular ring; 12. Connecting spring; 13. Protective sleeve; 14. Cutting blade; 15. Annular sealing plug; 16. Sealing groove; 17. Rotating disk; 18. Vacuum pump; 19. Connecting pipe; 20. Micro electric push rod. 21. Rotating block; 22. Rectangular sleeve; 23. Pressing rod; 24. Power flange; 25. Auxiliary spring; 26. Connecting seat; 27. Second drive motor; 28. First spur gear; 29. Arched track; 30. Connecting frame; 31. Rotating wheel; 32. Rotating shaft; 33. Second spur gear; 34. Limiting sleeve; 35. Spur rack; 36. First T-shaped block; 37. Spur gear ring; 38. Second T-shaped block; 39. Power spring. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and should not be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, they can be fixedly connected, detachably connected, or connected in one piece; they can be mechanically connected or electrically connected; they can be directly connected, or indirectly connected through an intermediate medium, or they can be internal connections between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The following describes an embodiment of the present invention based on its overall structure.

[0033] Example 1

[0034] See also Figures 1 to 11The present embodiment provides a plastic underwater pelletizer for producing modified plastic particles, comprising: a workbench 1 and a plastic extruder 2 mounted on the top of the workbench 1, a mold sleeve 4 mounted on one end of the plastic extruder 2, a pelletizing template 7 mounted inside the mold sleeve 4; a hydraulic cylinder 6, the hydraulic cylinder 6 is fixedly connected to the top of the workbench 1, the output end of the hydraulic cylinder 6 is connected to a cutting sleeve 5, an auxiliary connecting mechanism for connecting the cutting sleeve 5 and the mold sleeve 4 is provided between the cutting sleeve 5 and the mold sleeve 4, a first drive motor 3 is mounted on one end of the cutting sleeve 5, the output end of the first drive motor 3 is connected to a rotating rod 8, and One end of the rotating rod 8 passes through the interior of the cutting sleeve 5 and is rotatably connected to the cutting sleeve 5. One end of the rotating rod 8 is fixedly connected to a rotating disk 17. The outer wall of the rotating disk 17 is provided with a plurality of cutting blades 14. The auxiliary connecting mechanism includes a sealing groove 16 opened at the end of the cutting sleeve 5. The end of the mold sleeve 4 is fixedly connected to an annular sealing plug 15, and the annular sealing plug 15 matches the sealing groove 16. A vacuum pump 18 is installed on the outer wall of the cutting sleeve 5. The input end of the vacuum pump 18 is connected to a connecting pipe 19, and one end of the connecting pipe 19 passes through the interior of the cutting sleeve 5 and communicates with the sealing groove 16.

[0035] First, start the hydraulic cylinder 6, and the output end of the hydraulic cylinder 6 drives the cutting sleeve 5 to dock with the mold sleeve 4, so that the annular sealing plug 15 is inserted into the sealing groove 16. Then start the vacuum pump 18, and the vacuum pump 18 evacuates the inside of the sealing groove 16, so that the annular sealing plug 15 forms a sealed connection with the cutting sleeve 5 under the action of negative pressure.

[0036] Example 2

[0037] The switching assistant is located between the rotating disk 17 and the cutting blade 14 and is used to switch the cutting blade 14. The switching assistant includes a plurality of rotating blocks 21 arranged on the inner side of the rotating disk 17, and the rotating block 21 is fixedly connected to the cutting blade 14. The internal rotation of the rotating disk 17 is connected to a rotating shaft 32, and one end of the rotating shaft 32 passes through the inner side of the rotating disk 17 and is located on both sides of the rotating block 21. The switching assistant also includes a second spur gear 33 fixedly connected to the outer wall of the rotating shaft 32, and the interior of the rotating disk 17 is fixedly connected to a limiting sleeve 34, and the inner side of the limiting sleeve 34 is slidably connected to a second T-shaped block 38. The bottom of the second T-shaped block 38 is fixedly connected to a spur rack 35 meshing with the second spur gear 33, and one end of the spur rack 35 is fixed to the inner side of the rotating disk 17. A power spring 39 is fixedly connected, and one end of the power spring 39 is fixedly connected to the rotating disk 17. A power auxiliary component for moving the spur rack 35 is provided inside the rotating disk 17. The power auxiliary group includes a connecting frame 30 fixedly connected to the inner side of the spur rack 35. One end of the connecting frame 30 is rotatably connected to the rotating wheel 31. The inside of the rotating disk 17 is rotatably connected to the power flange 24. The bottom of the power flange 24 is fixedly connected to the spur gear ring 37. The inside of the rotating disk 17 is fixedly connected to the connecting seat 26. The top of the connecting seat 26 is installed with a second drive motor 27, and the output end of the second drive motor 27 is connected to a first spur gear 28 meshing with the spur gear ring 37. A plurality of arched tracks 29 are provided on the outside of the power flange 24.

[0038] When the cutting blade 14 needs to be replaced, the second drive motor 27 can be started intermittently. The output end of the second drive motor 27 drives the first spur gear 28 to rotate in a circle, thereby driving the spur gear ring 37 to drive the power flange 24 to rotate in a circle. When the multiple arched tracks 29 on the outer wall of the power flange 24 are in contact with a rotating wheel 31 respectively, the rotating wheel 31 moves from the lowest point of the arched track 29 to the highest point, the second drive motor 27 stops running, and in this process, the rotating wheel 31 pushes the spur rack 35 to move toward the second spur gear 33, thereby driving the vertical rotation. The rotating block 21 drives the cutting blade 14 to rotate ninety degrees and fit into the end face of the pelletizing template 7. At the same time, the rotating wheel 31 at the position of the cutting blade 14 that needs to be replaced moves from the highest point of the arch track 29 to the lowest point, so that the power spring 39 drives the straight rack 35 to reset, so that the rotating block 21 originally in the horizontal position drives the cutting blade 14 that needs to be replaced to rotate to the vertical position. Since there are multiple cutting blades 14, the cutting blades 14 can be automatically replaced multiple times by this reciprocating movement, without the need for staff to disassemble the equipment for replacement, thereby improving the overall practicality of the device.

[0039] Example 3

[0040] The shielding mechanism is located on the outer wall of the rotating rod 8 and is used to shield the unused cutting blade 14. The shielding mechanism includes a connecting shell 9 fixedly connected to the outer wall of the rotating rod 8. A micro electric push rod 20 is installed inside the connecting shell 9. The output end of the micro electric push rod 20 extends through the outside of the connecting shell 9 and is fixedly connected to a ring 11. The bottom of the ring 11 is rotatably connected to a protective sleeve 13.

[0041] When the cutting blade 14 needs to be replaced after being used for a long time, the micro electric push rod 20 is started, and the output end of the micro electric push rod 20 drives the ring 11 to move the protective sleeve 13 away from the cutting blade 14, so that the cutting blade 14 inside the protective sleeve 13 can be revealed. The above steps are reversed to cover the unused cutting blade 14, thereby preventing the rotating disk 17 from driving the unused cutting blade 14 to collide with the cut plastic again during the circular rotation process to affect its shape, thereby ensuring the quality of the plastic molding after cutting;

[0042] When the cutting blade 14 to be switched is removed from the protective sleeve 13, the second drive motor 27 is started intermittently;

[0043] Example 4

[0044] The top of the power flange 24 is fixedly connected to a plurality of rectangular slide rods 10, one end of each of the plurality of rectangular slide rods 10 passes through the outside of the protective sleeve 13 and is slidably connected to the protective sleeve 13, and an adaptive adjustment member is provided between the rotating shaft 32 and the rotating block 21 for making the cutting blade 14 close to the end of the pelletizing template 7, the adaptive adjustment member includes a first T-shaped block 36 slidably connected to the end of the rotating shaft 32, the inner side of the first T-shaped block 36 is fixedly connected to an auxiliary spring 25, and one end of the auxiliary spring 25 is fixedly connected to the rotating shaft 32, and one side of the first T-shaped block 36 is fixedly connected to the rotating block 21, the adaptive adjustment member also includes a rectangular sleeve 22 fixedly connected to the top end of the protective sleeve 13, the inner side of the rectangular sleeve 22 is slidably connected to the clamping rod 23, the top of the clamping rod 23 is fixedly connected to the connecting spring 12, and one end of the connecting spring 12 is fixedly connected to the rectangular sleeve 22;

[0045] When the cutting blade 14 is replaced, the micro electric push rod 20 pushes the protective sleeve 13 to reset and shield the cutting blade 14 in the vertical state, and drives the pressing rod 23 to move downward through the rectangular sleeve 22. When the pressing rod 23 contacts the horizontally rotating rotating block 21, the pelletizing template 7 is worn due to long-term friction with the cutting blade 14. When there is a gap between the new cutting blade 14 and the end face of the pelletizing template 7 after replacement, the pressing rod 23 pushes the rotating block 21 under the action of the connecting spring 12 to drive the cutting blade 14 to move toward the end face of the pelletizing template 7, so that the cutting blade 14 is tightly attached to the end face of the pelletizing template 7, thereby ensuring the tightness between the cutting blade 14 and the pelletizing template 7 after replacement, thereby improving the quality of subsequent plastic cutting and molding;

[0046] When the power boss 24 rotates in a circle, it will drive the protective sleeve 13 to rotate in a circle through the rectangular slide bar 10, thereby driving the clamping rod 23 to rotate in a circle through the rectangular sleeve 22, so that after the power boss 24 stops rotating, the clamping rod 23 can be adjusted to be above the rotating block 21 that is rotated in a horizontal position, so as to facilitate the position calibration of the switched cutting blade 14, thereby improving the overall practicality of the device.

[0047] The above is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A plastic underwater pelletizer for producing modified plastic particles, characterized in that: include: A workbench (1) and a plastic extruder (2) mounted on the top of the workbench (1), a mold sleeve (4) being mounted on one end of the plastic extruder (2), and a pelletizing template (7) being mounted inside the mold sleeve (4); A hydraulic cylinder (6), wherein the hydraulic cylinder (6) is fixedly connected to the top of the workbench (1), the output end of the hydraulic cylinder (6) is connected to a cutting sleeve (5), an auxiliary connection mechanism for connecting the cutting sleeve (5) and the mold sleeve (4) is provided between the two, one end of the cutting sleeve (5) is installed with a first drive motor (3), the output end of the first drive motor (3) is connected to a rotating rod (8), and one end of the rotating rod (8) passes through the interior of the cutting sleeve (5) and is rotatably connected to the cutting sleeve (5), one end of the rotating rod (8) is fixedly connected to a rotating disk (17), and the outer wall of the rotating disk (17) is provided with a plurality of cutting blades (14); a switching assistant, located between the rotating disk (17) and the cutting blade (14), for switching the cutting blade (14) for use, the switching assistant comprising a plurality of rotating blocks (21) arranged inside the rotating disk (17), wherein the rotating blocks (21) are fixedly connected to the cutting blade (14), the rotating disk (17) is internally rotatably connected with a rotating shaft (32), and one end of the rotating shaft (32) passes through the inner side of the rotating disk (17) and is located on both sides of the rotating block (21), and an adapting adjustment member for making the cutting blade (14) closely attached to the end of the pelletizing template (7) is provided between the rotating shaft (32) and the rotating block (21); a shielding mechanism, located on the outer wall of the rotating rod (8), for shielding the cutting blade (14) when not in use; The auxiliary connection mechanism includes a sealing groove (16) provided at the end of the cutting sleeve (5); an annular sealing plug (15) is fixedly connected to the end of the mold sleeve (4), and the annular sealing plug (15) matches the sealing groove (16); a vacuum pump (18) is installed on the outer wall of the cutting sleeve (5); an input end of the vacuum pump (18) is connected to a connecting pipe (19), and one end of the connecting pipe (19) passes through the interior of the cutting sleeve (5) and communicates with the sealing groove (16); The switching assist device further includes a second spur gear (33) fixedly connected to the outer wall of the rotating shaft (32); a limiting sleeve (34) is fixedly connected to the interior of the rotating disk (17); a second T-shaped block (38) is slidably connected to the inner side of the limiting sleeve (34); a spur rack (35) meshing with the second spur gear (33) is fixedly connected to the bottom of the second T-shaped block (38); one end of the spur rack (35) is fixedly connected to a power spring (39), and one end of the power spring (39) is fixedly connected to the rotating disk (17); and a power assist component for shifting the spur rack (35) to move is provided inside the rotating disk (17).

2. The underwater plastic pelletizer for producing modified plastic particles according to claim 1, characterized in that: The power assist group includes a connecting frame (30) fixedly connected to the inner side of the spur rack (35), one end of the connecting frame (30) is rotatably connected to a rotating wheel (31), the inside of the rotating disk (17) is rotatably connected to a power flange (24), the bottom of the power flange (24) is fixedly connected to a spur gear ring (37), the inside of the rotating disk (17) is fixedly connected to a connecting seat (26), a second driving motor (27) is installed on the top of the connecting seat (26), and the output end of the second driving motor (27) is connected to a first spur gear (28) meshing with the spur gear ring (37), and a plurality of arched tracks (29) are provided on the outer side of the power flange (24).

3. The underwater plastic pelletizer for producing modified plastic particles according to claim 2, characterized in that: The shielding mechanism comprises a connecting shell (9) fixedly connected to the outer wall of the rotating rod (8), a micro electric push rod (20) is installed inside the connecting shell (9), and the output end of the micro electric push rod (20) passes through the outside of the connecting shell (9) and is fixedly connected to a ring (11), and the bottom of the ring (11) is rotatably connected to a protective sleeve (13).

4. The underwater plastic pelletizer for producing modified plastic particles according to claim 3, characterized in that: A plurality of rectangular slide bars (10) are fixedly connected to the top of the power flange (24), and one end of each of the plurality of rectangular slide bars (10) passes through the outside of the protective sleeve (13) and is slidably connected to the protective sleeve (13).

5. The underwater plastic pelletizer for producing modified plastic particles according to claim 4, characterized in that: The adaptive adjustment member comprises a first T-shaped block (36) slidably connected to the end of the rotating shaft (32), an auxiliary spring (25) is fixedly connected to the inner side of the first T-shaped block (36), one end of the auxiliary spring (25) is fixedly connected to the rotating shaft (32), and one side of the first T-shaped block (36) is fixedly connected to the rotating block (21).

6. The underwater plastic pelletizer for producing modified plastic particles according to claim 5, characterized in that: The adaptive adjustment member further comprises a rectangular sleeve (22) fixedly connected to the top end of the inner portion of the protective sleeve (13); a pressing rod (23) is slidably connected to the inner portion of the rectangular sleeve (22); a connecting spring (12) is fixedly connected to the top of the pressing rod (23); and one end of the connecting spring (12) is fixedly connected to the rectangular sleeve (22).

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