A fully-protected closed plastic dust-free type pelletizer

Abstract

The application discloses a full-protection closed plastic dust-free type pelletizer and belongs to the technical field of plastic pelletizers. The pelletizer is provided with a pelletizer shell. The pelletizer comprises a feeding roller which is rotatably arranged on the inner surface of the pelletizer shell and is connected with an extrusion roller one through a plastic strip. The outer surface of the extrusion roller one is rotatably connected with an extrusion frame which is connected with the left end of the pelletizer shell. The full-protection closed plastic dust-free type pelletizer is provided with a full-closed pelletizer shell, a heating drying air guide mechanism at the feeding end, an extrusion conveying mechanism, a screening structure, a filter and a top and lateral dust removal mechanism. The heating drying air guide mechanism can avoid the influence of the heating gas on the pelletizing stability during drying, can avoid the adhesion of dust and debris during the later pelletizing and can improve the cleaning effect. The extrusion conveying mechanism can prevent the generation of too much dust and debris. The screening structure, the filter and the top and lateral dust removal mechanism can improve the closed pelletizing and dust removal effect, can avoid the scattering of dust, can filter and collect the dust and debris, and can convey the filtered gas to the feeding heating and ventilation position for circulation.

Description

Technical Field

[0001] This invention relates to the field of plastic pelletizer technology, specifically a fully enclosed, dust-free plastic pelletizer. Background Technology

[0002] Plastic pelletizers are pelletizing equipment developed for the production of modified plastics, masterbatches, and other polymer materials. They can cut plastic strips into uniform pellets for later product manufacturing. However, during use, it is inconvenient to perform effective closed cutting, which can easily cause plastic pellets to fly out and plastic dust to scatter, affecting the working environment.

[0003] To overcome the aforementioned shortcomings, existing technology (Chinese patent application CN202323602973.6, filed on 20231228) describes a plastic pelletizer for producing plastic particles. Through the coordination of the machine body and the pelletizing size adjustment mechanism, the gap between the two pelletizing rollers is increased, thereby increasing the size of the granulated plastic particles. This allows the plastic pelletizer to process plastic particles of different sizes, reducing its operational limitations. Furthermore, existing technology (Chinese patent application CN202322266773.1, filed on 2023-08-23) describes a plastic pelletizer where a pushing mechanism sends a full collection frame along a roller conveyor table, and a new collection frame is sent to the bottom of the discharge port. During the switching of collection frames, plastic particles falling from the discharge port are collected by a blocking mechanism to prevent them from falling or being thrown to the outside, improving the collection efficiency of plastic particles. It also makes the replacement and delivery of collection frames more convenient. To address the issue of labor-saving methods, this paper proposes a dust removal method for plastic pelletizers. This method utilizes an upper cleaning brush plate with a corresponding lower cleaning brush plate on its lower surface. During pelletizing, after the plastic pellets emerge from the water, the upper and lower cleaning brush plates wipe both sides of the plastic, removing dust and preventing it from affecting the finished product. While this method effectively removes dust, the open cutting and feeding environment during operation easily causes flying plastic pellets and dust to scatter, affecting the safety of the pelletizing environment. Furthermore, the unstable positioning at the feeding end can lead to excessive dust generation from the plastic pellets, making rapid dust removal difficult and further compromising the safety of the pelletizing environment.

[0004] To address the aforementioned issues, there is an urgent need for innovative design based on the existing dust-free plastic pelletizer. Summary of the Invention

[0005] The purpose of this invention is to provide a fully enclosed, dust-free plastic pelletizer to solve the problems mentioned in the background art, where the open cutting and feeding / discharging environment during operation easily causes plastic particles and dust to scatter, affecting the safety of the pelletizing environment. Furthermore, due to the unstable positioning at the feeding end, excessive dust is easily generated by the plastic particles, making it difficult to quickly clean up the dust and affecting the safety of the pelletizing environment.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a fully enclosed, dust-free plastic pelletizer, comprising a pelletizer housing; including: a feed roller rotating on the inner surface of the pelletizer housing, and the feed roller being connected to an extrusion roller one via a plastic strip, and an extrusion frame being rotatably connected to the outer surface of the extrusion roller one, and the extrusion frame being lifted and lowered to the inner left end of the pelletizer housing; simultaneously, an elastic frame being connected to the middle section of the inner surface of the pelletizer housing via an elastic telescopic mechanism, and a pelletizing roller being rotatably connected to the right side of the pelletizer housing; and a feeding frame being connected to the pelletizer housing via a heating and ventilation mechanism; simultaneously, a filter plate being connected to the pelletizer housing via an elastic sieving mechanism; a dust collection component one being installed on the upper surface of the pelletizer housing, and a dust collection pipe being installed on the outer surface of the dust collection component one; simultaneously, a dust collection component two being installed on the lower side of the dust collection pipe, and the dust collection component two being located on the side of the pelletizer housing and below the filter plate; and a filter assembly being connected to the filter via a snap-fit ​​filter mechanism. This fully enclosed, dust-free plastic pelletizer features a fully enclosed pelletizer housing and a heating and drying air guide mechanism at the feed end. During drying, the heating gas prevents it from affecting pelletizing stability and avoids dust and debris buildup that is difficult to clean later. An extrusion conveyor mechanism controls the pelletizing process to prevent excessive dust and debris generation. A sieving structure and top and side dust collectors enhance the dust removal efficiency of the enclosed pelletizing process, preventing dust from scattering. A filter is used to collect and filter dust and debris, and the filtered gas is then circulated back to the heating and air inlet. Preferably, the outer surface of the extrusion frame is rotatably connected to a telescopic plate, and the outer surface of the telescopic plate is telescopically connected to a guide plate. The top of the guide plate is rotatably connected to the top of the feed inlet of the pelletizer housing. The pelletizer housing forms an extrusion conveying structure with the plastic strip through the feed roller and the first extrusion roller. At the same time, the first extrusion roller forms a telescopic structure with the pelletizer housing through the extrusion frame. The extrusion frame forms a telescopic air guiding structure with the pelletizer housing through the telescopic plate and the guide plate. The pelletizer housing is made of a fully enclosed stainless steel structure.

[0007] Preferably, the elastic telescopic mechanism further includes a lower pressure frame telescopically connected to the middle section of the inner surface of the pelletizer housing, and a guide rod telescopically connected to the inner surface of the lower pressure frame, and an elastic frame installed on the outer surface of the guide rod. At the same time, a compression spring is elastically connected between the elastic frame and the lower pressure frame, and the compression spring is nested on the outer surface of the guide rod. A compression roller is rotatably connected to the inner surface of the elastic frame, and a support plate is connected to the lower side of the compression roller through a plastic strip. Meanwhile, a pelletizing roller is attached to the side of the support plate.

[0008] Preferably, the pelletizer housing and the lower pressing frame form a telescopic lifting structure, and the lower pressing frame forms an elastic telescopic structure with the elastic frame through the guide rod and the first compression spring, and the elastic frame forms a compression limiting structure with the plastic strip through the second compression roller and the support plate.

[0009] Preferably, the heating and ventilation mechanism further includes a feeding frame connected to the lower side of the feed inlet of the pelletizer housing, and a heating wire is connected to the lower side of the feeding frame. A dustproof plate is provided on the lower side of the heating wire, and an air inlet is installed on the lower side of the dustproof plate. An air inlet pipe is installed in the middle section of the lower surface of the air inlet, and an exhaust pipe is connected to the air inlet pipe through a valve body.

[0010] Preferably, the pelletizer housing and the feeding frame are integrated into a single structure, and the feeding frame forms a dustproof air intake heating structure with the air inlet component through heating wire and dustproof plate, and the air inlet component and the upper surface of the air inlet pipe are embedded in the structure.

[0011] Preferably, the elastic sieving mechanism further includes a movable block installed on the outer surface of the filter plate, which limits the sliding of the movable block on the inner wall of the pelletizer housing. A return spring is elastically connected between the movable block and the pelletizer housing. The filter plate is inclined about the inner surface of the pelletizer housing. At the same time, an extrusion block is installed on the lower side of the filter plate, and a cam is extruded and connected to the outer side of the extrusion block. The cam is positioned and rotated on the lower side of the pelletizer housing.

[0012] Preferably, the pelletizer housing forms an elastic inclined sliding structure with the filter plate through a moving block and a return spring, and the filter plate, the moving block, and the extrusion block form an integrated structure, and the filter plate forms an extrusion structure with the cam through the extrusion block.

[0013] Preferably, the locking filter mechanism further includes a locking gear rotatably connected to the inner surface of the filter assembly, and a toothed condition is cross-meshing connected to the outer surface of the locking gear, limiting and locking the end of the toothed condition onto the filter. A compression spring is elastically connected between the toothed condition and the filter assembly. Simultaneously, a limiting gear is coaxially mounted on the inner surface of the locking gear, and a locking element is engaged with the outer surface of the limiting gear. A return spring is elastically connected between the locking element and the filter assembly. The filter assembly forms a meshing and locking structure with the filter through the locking gear and the toothed condition, and the toothed condition forms an elastic locking structure with the filter assembly through the compression spring. The locking gear and the limiting gear form an integrated coaxial structure, and the limiting gear forms a limiting locking structure with the filter assembly through the locking element and the return spring.

[0014] Preferably, the inner surface of the filter assembly is rotatably connected to a threaded rod, and the outer surface of the threaded rod is threadedly connected to a baffle, which limits the lifting and lowering of the baffle to the inner surface of the filter assembly. A discharge pipe is installed on the lower side of the outer surface of the filter assembly. The filter assembly forms a threaded lifting structure through the threaded rod and the baffle, and the baffle, the discharge pipe, and the dust suction pipe form an alternating sealing structure.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. This fully enclosed plastic dust-free pelletizer features a fully enclosed pelletizer shell, coupled with a heating and drying air guide mechanism at the feed end. During drying, the heating gas is prevented from affecting the pelletizing stability, and the pelletizing process is prevented from causing dust and debris to stick together and become difficult to clean. The extrusion conveying mechanism controls the pelletizing process to prevent excessive dust and debris generation. The sieving structure, along with top and side dust removal, improves the dust removal effect of the enclosed pelletizing process, preventing dust from scattering. A filter is used to filter and collect dust and debris, and the filtered gas is transported to the feed heating and ventilation area for circulation.

[0016] 2. This fully enclosed, dust-free plastic pelletizer is equipped with an elastic telescopic mechanism. The adjustable lower pressure frame effectively compresses the plastic strips at the ends via the elastically controlled extrusion rollers, ensuring stability during pelletizing. Furthermore, a heating and ventilation mechanism is included. A feeding frame and heating wire assembled at the pelletizer's feed end, along with a dustproof plate assembled with an air inlet, control the upward movement of hot air to dry the cooled plastic strips. The telescopic plate and air guide plate further prevent hot air from affecting the temperature within the pelletizing space, increasing the dryness of the pellets and preventing the cut pellets from sticking together, thus avoiding the difficulty in cleaning sticky dust particles.

[0017] 3. This fully enclosed, dust-free plastic pelletizer is equipped with an elastic sieving mechanism, which facilitates the removal and removal of dust particles adsorbed on the plastic pellets through an elastically controlled filter plate. It also works in conjunction with two suction components to perform suction from different directions. Furthermore, it features a locking filter mechanism, which, through the elastically controlled teeth within the filter assembly, stably engages with the filter, controlling the stability of the filtration process. After dust is sucked out, it undergoes further filtration. This, combined with the limiting gears and locking components, enhances the stability of the filter assembly's engagement, preventing loosening. A baffle facilitates air suction filtration, and the discharge pipe can be opened later for reverse ventilation and collection. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the pelletizer housing of the present invention; Figure 2 This is a schematic diagram of the three-dimensional structure of the pelletizer housing of the present invention (half-section view). Figure 3 This is a partial cross-sectional perspective view of the extrusion frame of the present invention. Figure 4 For the present invention Figure 3 Enlarged 3D structural diagram at point A in the middle; Figure 5 This is a schematic diagram of the three-dimensional structure of the pelletizing roller of the present invention; Figure 6 This is a bottom-view three-dimensional structural diagram of the filter plate of the present invention; Figure 7 This is a partial cross-sectional three-dimensional structural diagram of the filter component of the present invention.

[0019] In the diagram: 1. Pelletizer housing; 2. Feed roller; 3. Extrusion roller one; 4. Extrusion frame; 5. Telescopic plate; 6. Air guide plate; 7. Lower pressure frame; 8. Guide rod; 9. Elastic frame; 10. Extrusion spring one; 11. Extrusion roller two; 12. Support plate; 13. Pelletizing roller; 14. Feeding frame; 15. Heating wire; 16. Dustproof plate; 17. Air inlet component; 18. Air inlet pipe; 19. Exhaust pipe; 20. Filter plate; 21. Moving block; 22. Return spring one; 23. Extrusion block; 24. Cam; 25. Dust suction component one; 26. Dust suction pipe; 27. Dust suction component two; 28. Filter; 29. ​​Filter assembly; 30. Locking gear; 31. Gear condition; 32. Extrusion spring two; 33. Limit gear; 34. Clamping component; 35. Return spring two; 36. Threaded rod; 37. Baffle; 38. Discharge pipe. Detailed Implementation

[0020] 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 embodiments of the present invention, and not all embodiments. Based on the 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.

[0021] Please see Figures 1-7 The present invention provides a technical solution: a fully enclosed plastic dust-free pelletizer, which is provided with a pelletizer housing 1.

[0022] Example 1: As Figures 1-7 The present invention provides the following technical solution: a fully enclosed, dust-free plastic pelletizer, comprising: a feed roller 2 rotating on the inner surface of the pelletizer housing 1; the feed roller 2 being connected to an extrusion roller 3 via a plastic strip; an extrusion frame 4 being rotatably connected to the outer surface of the extrusion roller 3; the extrusion frame 4 being vertically connected to the left end of the pelletizer housing 1; an elastic frame 9 being connected to an elastic telescopic mechanism in the middle section of the inner surface of the pelletizer housing 1; and a rotatably connected frame 9 on the right side of the pelletizer housing 1. The pelletizing roller 13 and the pelletizer housing 1 are connected to the feeding rack 14 through the heating and ventilation mechanism. The pelletizer housing 1 is connected to the filter plate 20 through the elastic screening mechanism. The upper surface of the pelletizer housing 1 is equipped with a dust collection component 25, and the outer surface of the dust collection component 25 is equipped with a dust collection pipe 26. The lower side of the dust collection pipe 26 is equipped with a second dust collection component 27, and the second dust collection component 27 is located on the side of the pelletizer housing 1 and the lower side of the filter plate 20. The filter 28 is connected to the filter assembly 29 through the snap-fit ​​filter mechanism.

[0023] In use, the feed roller 2, assembled through the pelletizer housing 1, effectively supports the plastic strip and works in conjunction with the extrusion roller 3 for extrusion and conveying. During conveying, the air inlet 17, heating wire 15, and feeding frame 14 work together to dry the cooled plastic strip. The telescopic plate 5 and air guide plate 6, connected to the extrusion frame 4, prevent hot air from affecting the temperature of the pelletizing space in the pelletizer housing 1 and prevent plastic particles from sticking together during pelletizing, thus increasing pelletizing stability. The elastic control of the cooperation between the extrusion roller 11 and the support plate 12 further improves pelletizing stability and reduces [the risk of damage]. The dust generation, combined with the use of filter plate 20, screens the cut particles into finer particles. The dust collection components 25 on the top of the pelletizer housing 1 and 27 on its sides simultaneously clean the cutting and screening environments. The fully enclosed pelletizer housing 1 enhances dust removal efficiency. The filter assembly 29, assembled with filter 28, effectively controls dust collection and filters and collects dust particles. Reverse ventilation is achieved through the openable discharge pipe 38, cleaning the filter assembly 29 and the collected dust particles, further improving the cleaning effect.

[0024] Example 2: Figures 1-5 The technical solution shown, based on Embodiment 1, further discloses stability during the cutting process, avoids excessive dust particles, and incorporates drying treatment during feeding to prevent particle adhesion after cutting, improving dust cleaning efficiency. It solves the problem that in the open cutting and feeding / discharging environment during operation, plastic particles and dust are easily scattered, affecting the safety of the pelletizing environment. Furthermore, the unstable positioning at the feeding end easily leads to excessive dust generation from plastic particles. Specifically, the outer surface of the extrusion frame 4 is rotatably connected to a telescopic plate 5, and the outer surface of the telescopic plate 5 is telescopically connected to a guide plate 6. The top of the guide plate 6 is rotatably connected to the top of the feed inlet of the pelletizer housing 1. The pelletizer housing 1, through the feed roller 2 and the extrusion roller 3, forms an extrusion conveying structure with the plastic strip. Simultaneously, the extrusion roller 3, through the extrusion frame 4, forms a telescopic structure with the pelletizer housing 1. The extrusion frame 4, through the telescopic plate 5 and the guide plate 6, forms a telescopic air guiding structure with the pelletizer housing 1. The pelletizer housing 1 is made of a fully enclosed stainless steel structure. Figure 3 and Figure 5 As shown, the elastic telescopic mechanism also includes a lower pressure frame 7 telescopically connected to the middle section of the inner surface of the pelletizer housing 1. A guide rod 8 is telescopically connected to the inner surface of the lower pressure frame 7, and an elastic frame 9 is installed on the outer surface of the guide rod 8. A compression spring 10 is elastically connected between the elastic frame 9 and the lower pressure frame 7, and the compression spring 10 is nested on the outer surface of the guide rod 8. A compression roller 11 is rotatably connected to the inner surface of the elastic frame 9, and a support plate 12 is connected to the lower side of the compression roller 11 via a plastic strip. A pelletizing roller 13 is attached to the side of the support plate 12. Figure 3 and Figure 5 As shown, the pelletizer housing 1 and the lower pressure frame 7 form a telescopic lifting structure, and the lower pressure frame 7 forms an elastic telescopic structure with the elastic frame 9 through the guide rod 8 and the compression spring 10. The elastic frame 9 forms a compression limiting structure with the plastic strip through the compression roller 11 and the support plate 12. Figure 3 and Figure 4 As shown, the heating and ventilation mechanism also includes a feeding frame 14 connected to the lower side of the feed inlet of the pelletizer housing 1, and a heating wire 15 is connected to the lower side of the feeding frame 14. A dustproof plate 16 is provided on the lower side of the heating wire 15, and an air inlet 17 is installed on the lower side of the dustproof plate 16. An air inlet pipe 18 is installed in the middle section of the lower surface of the air inlet 17, and the air inlet pipe 18 is connected to an exhaust pipe 19 through a valve body; Figure 3 and Figure 4 As shown, the pelletizer housing 1 and the feeding rack 14 form an integrated structure, and the feeding rack 14 forms a dustproof air intake heating structure with the air inlet component 17 through the heating wire 15 and the dustproof plate 16. The air inlet component 17 and the air inlet pipe 18 are embedded in the upper surface.

[0025] During pelletizing, the plastic strip is conveyed to the feed rack 14 assembled at the feed end of the pelletizer housing 1. It is then heated by the heating wire 15 assembled at the bottom of the feed rack 14. The dustproof plate 16 and air inlet 17 at the bottom of the heating wire 15 work in conjunction with the air inlet pipe 18 to dry the plastic strip. The plastic strip is then conveyed to the feed roller 2, and the telescopic cylinder 1 assembled on the top of the pelletizer housing 1 is activated. This stably controls the extrusion frame 4 to drive the extrusion roller 3 to extrude the plastic strip, ensuring stable conveying. As the extrusion frame 4 moves, the telescopic plate 5 and the air guide plate 6 connected to the extrusion frame 4 are tilted and extended to prevent hot air from entering the pelletizing space of the pelletizer housing 1, thus avoiding affecting pelletizing stability. When the plastic strip is extruded and conveyed between the extrusion roller 3 and the feed roller 2, it is conveyed to the support plate 12 of the telescopic control. The telescopic cylinder 2 assembled on the top of the pelletizer housing 1 is activated, and the lower pressure frame 7 is moved down. This causes the elastic frame 9, which is connected to the guide rod 8, to move down elastically in conjunction with the extrusion spring 10. The extrusion roller 11 assembled on the elastic frame 9 elastically extrudes the end of the plastic strip, controlling the stability of the contact between the end of the plastic strip and the pelletizing roller 13. This prevents the plastic strip from moving excessively during pelletizing and generating too much dust particles, thus improving the stability of the pelletizer. The fully enclosed design of the pelletizer housing 1 also keeps the dust inside the pelletizer housing 1, preventing dust from scattering. Furthermore, the dust removal system improves the safety of the pelletizing environment.

[0026] Example 3: Figure 6 and Figure 7The technical solution shown, based on Embodiment 2, further discloses the filtration and conveying of plastic granules, and simultaneously performs dust extraction treatment on the cutting environment and the environment below the sieving, filters the dust, and re-conveys the treated gas to the heating point at the feed end for wind-powered drying. This solves the problem of difficulty in quickly cleaning dust and affecting the safety of the pelletizing environment. The specific details are as follows: The elastic sieving mechanism also includes a movable block 21 mounted on the outer surface of the filter plate 20, which is limited and slidably mounted on the inner wall of the pelletizer housing 1. A return spring 22 is elastically connected between the movable block 21 and the pelletizer housing 1. The filter plate 20 is inclined relative to the inner surface of the pelletizer housing 1. A pressing block 23 is mounted on the lower side of the filter plate 20, and a cam 24 is pressed and connected to the outer side of the pressing block 23, positioning and rotating the cam 24 on the lower side of the pelletizer housing 1. Figure 6 As shown, the pelletizer housing 1 forms an elastic inclined sliding structure with the filter plate 20 via the moving block 21 and the return spring 22. The filter plate 20, moving block 21, and extrusion block 23 form an integrated structure, and the filter plate 20 forms an extrusion structure with the cam 24 via the extrusion block 23. Figure 7 As shown, the locking filter mechanism also includes a locking gear 30 rotatably connected to the inner surface of the filter assembly 29, and a toothed condition 31 cross-meshingly connected to the outer surface of the locking gear 30, limiting and locking the end of the toothed condition 31 onto the filter 28. A compression spring 32 is elastically connected between the toothed condition 31 and the filter assembly 29. Simultaneously, a limiting gear 33 is coaxially mounted on the inner surface of the locking gear 30, and a locking member 34 is engaged with the outer surface of the limiting gear 33. A return spring 35 is elastically connected between the locking member 34 and the filter assembly 29. The filter assembly 29 forms a meshing and locking structure with the filter 28 through the locking gear 30 and the toothed condition 31, and the toothed condition 31 forms an elastic locking structure with the filter assembly 29 through the compression spring 32. The locking gear 30 and the limiting gear 33 form an integrated coaxial structure, and the limiting gear 33 forms a limiting and locking structure with the filter assembly 29 through the locking member 34 and the return spring 35. Figure 7 As shown, a threaded rod 36 is rotatably connected to the inner surface of the filter assembly 29, and a baffle 37 is threadedly connected to the outer surface of the threaded rod 36. The baffle 37 is connected to the inner surface of the filter assembly 29 for limiting lifting. A discharge pipe 38 is installed on the lower side of the outer surface of the filter assembly 29. The filter assembly 29 forms a threaded lifting structure with the threaded rod 36 and the baffle 37, and the baffle 37, the discharge pipe 38 and the suction pipe 26 form an alternating sealing structure.

[0027] After pelletizing, the small motor mounted on the side of the pelletizer housing 1 is started, driving the cam 24 mounted on the rotating shaft to squeeze the extrusion block 23. The filter plate 20 mounted on the extrusion block 23 is controlled to slide stably within the pelletizer housing 1 via the side-mounted moving block 21. This controls the moving block 21 to squeeze the return spring 22, which is used to screen the plastic pellets when the cam 24 disengages from the extrusion block 23, separating out dust and fine particles, improving the stability of the plastic pellet output. The filter plate 20 is then activated by the filter plate 20 mounted on the left side of the pelletizer housing 1. The filter fan assembled in filter 28, together with the suction pipe 26 installed in filter 28 and the suction components 25 and 27, simultaneously vacuums the cutting space and bottom space of the pelletizer housing 1. The suctioned dust and fine air are filtered through the built-in filter assembly 29 in filter 28. Furthermore, the filter fan's rotation, along with the motor mounted on top of filter 28 driving the threaded rod 36, controls the baffle 37 to open the discharge pipe 38 and... The suction pipe 26 is blocked, and the valve between the air inlet pipe 18 and the exhaust pipe 19 is rotated to block the air inlet pipe 18. This, combined with the opening of the exhaust pipe 19, controls the reverse flow of gas, thereby cleaning the filter assembly 29 and the filtered dust. This improves the cleaning effect of the reverse blowing and increases the stability of dust collection. When the filter assembly 29 needs to be replaced after prolonged use, the clamping clip 34 is disengaged from the limiting gear 33, and the second return spring 35 is compressed. Holding the handle of the filter assembly 29 and a hand tool, the clamping gear 30 is rotated, causing the tooth condition 31 to contract. This compresses the second spring 32, controlling the filter assembly 29 to detach from the filter 28, allowing for the removal and replacement of the filter assembly 29. The clamping clip 34, along with the clamping clip 34, prevents the tooth condition 31 from loosening, thus preventing the filter assembly 29 from detaching and increasing the stability of the filtration process.

[0028] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0029] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A fully enclosed plastic dust-free pelletizer, equipped with a pelletizer housing (1); Its features are, include: The feed roller (2) rotates on the inner surface of the pelletizer housing (1), and the feed roller (2) is connected to the extrusion roller (3) by a plastic strip. The outer surface of the extrusion roller (3) is rotatably connected to the extrusion frame (4), and the extrusion frame (4) is lifted and connected to the left end of the inside of the pelletizer housing (1). At the same time, the elastic extension mechanism in the middle section of the inner surface of the pelletizer housing (1) is connected to the elastic frame (9), and the right side of the pelletizer housing (1) is rotatably connected to the pelletizing roller (13). The pelletizer housing (1) is connected to the heating and ventilation mechanism. A feeding rack (14) is connected, and a filter plate (20) is connected to the pelletizer housing (1) through an elastic sieving mechanism. A dust collection component (25) is installed on the upper surface of the pelletizer housing (1), and a dust collection pipe (26) is installed on the outer surface of the dust collection component (25). A dust collection component (27) is installed on the lower side of the dust collection pipe (26). The dust collection component (27) is located on the side of the pelletizer housing (1) and on the lower side of the filter plate (20). The filter (28) is connected to a filter assembly (29) through a snap-fit ​​filter mechanism.

2. The fully enclosed, dust-free plastic pelletizer according to claim 1, characterized in that: The outer surface of the extrusion frame (4) is rotatably connected to a telescopic plate (5), and the outer surface of the telescopic plate (5) is telescopically connected to a guide plate (6). The top of the guide plate (6) is rotatably connected to the top of the feed inlet of the pelletizer housing (1). The pelletizer housing (1) forms an extrusion conveying structure with the plastic strip through the feed roller (2) and the first extrusion roller (3). At the same time, the first extrusion roller (3) forms a telescopic structure with the pelletizer housing (1) through the extrusion frame (4). The extrusion frame (4) forms a telescopic air guiding structure with the pelletizer housing (1) through the telescopic plate (5) and the guide plate (6). The pelletizer housing (1) is made of stainless steel with a fully enclosed structure.

3. The fully enclosed, dust-free plastic pelletizer according to claim 1, characterized in that: The elastic telescopic mechanism also includes a lower pressure frame (7) that is telescopically connected to the middle section of the inner surface of the pelletizer housing (1), and a guide rod (8) is telescopically connected to the inner surface of the lower pressure frame (7), and an elastic frame (9) is installed on the outer surface of the guide rod (8). At the same time, a compression spring (10) is elastically connected between the elastic frame (9) and the lower pressure frame (7), and the compression spring (10) is nested on the outer surface of the guide rod (8). A compression roller (11) is rotatably connected to the inner surface of the elastic frame (9), and a support plate (12) is connected to the lower side of the compression roller (11) through a plastic strip. At the same time, a pelletizing roller (13) is attached to the side of the support plate (12).

4. The fully enclosed, dust-free plastic pelletizer according to claim 3, characterized in that: The pelletizer housing (1) and the lower pressure frame (7) form a telescopic lifting structure, and the lower pressure frame (7) forms an elastic telescopic structure with the elastic frame (9) through the guide rod (8) and the first compression spring (10), and the elastic frame (9) forms a compression limiting structure with the plastic strip through the second compression roller (11) and the support plate (12).

5. The fully enclosed, dust-free plastic pelletizer according to claim 1, characterized in that: The heating and ventilation mechanism also includes a feeding rack (14) connected to the lower side of the feed inlet of the pelletizer housing (1), and a heating wire (15) is connected to the lower side of the feeding rack (14). A dustproof plate (16) is provided on the lower side of the heating wire (15), and an air inlet (17) is installed on the lower side of the dustproof plate (16). An air inlet pipe (18) is installed in the middle section of the lower surface of the air inlet (17), and an exhaust pipe (19) is connected to the air inlet pipe (18) through a valve body.

6. The fully enclosed, dust-free plastic pelletizer according to claim 5, characterized in that: The pelletizer housing (1) and the feeding rack (14) form an integrated structure. The feeding rack (14) forms a dustproof air intake heating structure with the air inlet component (17) through the heating wire (15) and the dustproof plate (16). The air inlet component (17) and the air inlet pipe (18) are embedded in the upper surface of the feeding rack (18).

7. The fully enclosed, dust-free plastic pelletizer according to claim 1, characterized in that: The elastic sieving mechanism also includes a movable block (21) installed on the outer surface of the filter plate (20), which limits the movable block (21) to slide on the inner wall of the pelletizer housing (1). A return spring (22) is elastically connected between the movable block (21) and the pelletizer housing (1). The filter plate (20) is inclined about the inner surface of the pelletizer housing (1). At the same time, a pressing block (23) is installed on the lower side of the filter plate (20), and a cam (24) is pressed and connected to the outer side of the pressing block (23). The cam (24) is positioned and rotated on the lower side of the pelletizer housing (1).

8. A fully enclosed, dust-free plastic pelletizer according to claim 7, characterized in that: The pelletizer housing (1) forms an elastic inclined sliding structure with the filter plate (20) through the moving block (21) and the return spring (22), and the filter plate (20) forms an integrated structure with the moving block (21) and the extrusion block (23), and the filter plate (20) forms an extrusion structure with the cam (24) through the extrusion block (23).

9. A fully enclosed, dust-free plastic pelletizer according to claim 1, characterized in that: The locking filter mechanism also includes a locking gear (30) rotatably connected to the inner surface of the filter assembly (29), and a toothed condition (31) is cross-meshing connected to the outer surface of the locking gear (30), which limits and engages the end of the toothed condition (31) on the filter (28). A compression spring (32) is elastically connected between the toothed condition (31) and the filter assembly (29). At the same time, a limiting gear (33) is coaxially installed on the inner surface of the locking gear (30), and a locking member (34) is engaged and connected to the outer surface of the limiting gear (33). A return spring (35) is elastically connected between the filter assembly (28) and the filter component (29). The filter component (29) forms an engagement structure with the filter (28) through a locking gear (30) and a tooth condition (31). The tooth condition (31) forms an elastic locking structure with the filter assembly (29) through a compression spring (32). The locking gear (30) and the limiting gear (33) form an integrated coaxial structure. At the same time, the limiting gear (33) forms a limiting engagement structure with the filter assembly (29) through a clip (34) and a return spring (35).

10. A fully enclosed, dust-free plastic pelletizer according to claim 9, characterized in that: The inner surface of the filter assembly (29) is rotatably connected to a threaded rod (36), and the outer surface of the threaded rod (36) is threadedly connected to a baffle (37), which limits the lifting and lowering of the baffle (37) on the inner surface of the filter assembly (29). A discharge pipe (38) is installed on the lower side of the outer surface of the filter assembly (29). The filter assembly (29) forms a threaded lifting structure with the threaded rod (36) and the baffle (37), and the baffle (37) forms an alternating sealing structure with the discharge pipe (38) and the suction pipe (26).

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