Environment-friendly plastic granulator for plastic processing

Abstract

The application relates to the technical field of plastic processing equipment, and discloses an environment-friendly plastic granulator for plastic processing, which comprises a bottom box, a treatment barrel for dehumidifying and processing recycled plastics is arranged at the top of the bottom box, a granulation main machine box is arranged on one side of the treatment barrel, and the recycled plastics after multiple treatments in the treatment barrel are subjected to granulation processing treatment; and a preliminary treatment mechanism is used for preliminarily dehumidifying and processing the recycled plastic raw materials after a cleaning process. By increasing and arranging an auxiliary treatment mechanism, the mechanism can not only replace the wet steam in the material pores by dry nitrogen during the pulse drying process, strengthen the removal effect of the internal pore water of thick-wall materials, and improve the defect that the outside is dry and the inside is wet in the traditional drying process, but also remove the combined water in the intermolecular gap of the melt by the nitrogen gas stripping effect during the melt granulation stage, further reduce the hydrolysis reaction probability in the melt state, and reduce the internal bubble defects of the melt.

Description

Technical Field

[0001] This invention relates to the field of plastic processing equipment technology, specifically to an environmentally friendly plastic granulator for plastic processing. Background Technology

[0002] With the widespread application of biodegradable plastics in disposable packaging, tableware, and agricultural mulch films, their recycling and reuse after disposal has gradually become an important development direction for the plastics recycling industry. Compared with traditional general-purpose plastics such as polyethylene and polypropylene, polyester-based biodegradable plastics contain a large number of ester bonds in their molecular chains, exhibiting significant high hygroscopicity and easy hydrolysis. These materials are highly susceptible to moisture absorption during the entire recycling process due to the humidity of the storage environment, and the initial water washing and impurity removal process further increases the material's moisture content. Moisture not only adheres to the material's surface but also penetrates into the molecular gaps within the material, forming bound water that is difficult to remove using conventional methods, posing potential quality risks for subsequent processing.

[0003] Currently, the dehumidification process in the plastic recycling industry mostly uses traditional hot air drying technology. This process can meet the basic dehumidification requirements for polyolefin plastics with strong hydrophobicity, but when applied to polyester biodegradable plastics, it can only remove free moisture from the surface of the material and cannot achieve deep dehumidification. In the high-temperature environment of subsequent melt granulation, the residual moisture inside the material will undergo a violent hydrolysis reaction with the ester bonds, causing molecular chain breakage and a rapid decrease in the molecular weight of the material. This directly leads to a significant increase in the brittleness of the granulated product, a substantial decrease in tensile strength, and mechanical properties that fail to meet the standards for downstream products.

[0004] Furthermore, residual moisture vaporizes during the melting process, forming numerous microbubbles that create pore defects within the granules. The granule surface is also prone to surface imperfections such as pitting and silver streaks. Ultimately, this results in the failure of both the mechanical properties and appearance quality of the recycled material, significantly reducing its application scope and economic value. This has become a core technological bottleneck restricting the efficient recycling and large-scale reuse of polyester-based biodegradable plastics. Therefore, those skilled in the art have proposed an environmentally friendly plastic granulator for plastic processing to address the aforementioned technical problems. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an environmentally friendly plastic granulator for plastic processing, which solves the problem of the inability to remove internal moisture during the recycling and granulation of polyester environmentally friendly plastics.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an environmentally friendly plastic granulator for plastic processing, comprising, The bottom box has a processing tank at the top for dehumidifying recycled plastics. A granulation unit is located on one side of the processing tank, which granulates the recycled plastics that have undergone multiple processing steps in the processing tank. The preliminary processing unit, located inside the processing tank, is used to perform preliminary dehumidification processing on the recycled plastic raw materials after the cleaning process. The pulse separation mechanism is located on both sides of the processing tank and is used to perform pulse-like reprocessing of the recycled plastic raw materials after the preliminary processing mechanism. The auxiliary processing mechanism, located on both sides of the processing tank, is used to assist in the discharge of moisture from the plastic raw materials recovered during the pulse separation process. The terminal granulation unit, located on the granulation main unit, is used to granulate the processed recycled plastic raw materials.

[0007] Preferably, the preliminary processing mechanism includes a separation mesh cover, the processing barrel is provided with a separation mesh cover inside, a sealing cover is provided on one side of the processing barrel, a drive motor is provided in the middle of the sealing cover, when the drive motor is running, its drive end drives the separation mesh cover inside the processing barrel to rotate, a discharge seat is provided in the middle of the bottom end of the processing barrel, and a one-way valve is provided in the middle of one side of the discharge seat.

[0008] Preferably, the preliminary processing mechanism further includes a cylindrical airbag. A cylindrical airbag is provided in the middle of the inner side of the separation mesh cover. A miniature air pump for inflating the cylindrical airbag is provided in the upper middle part of one side of the sealing cover. A one-way exhaust valve for venting the cylindrical airbag after use is provided in the lower middle part of one side of the sealing cover. Multiple sets of rubber protrusions are equidistantly provided on the outer wall of the cylindrical airbag. Multiple annular limiting sleeves for preventing deformation after inflation are equidistantly provided on the outer wall of the cylindrical airbag.

[0009] Preferably, the pulsating separation mechanism includes a rotary vane vacuum pump. The rotary vane vacuum pump is provided at the top center of the processing barrel to evacuate its internal chamber. Side boxes are provided on both sides of the processing barrel, and the front and rear side boxes connect the processing barrel to the interior of the bottom box. A cooling dryer is provided in the middle of the front side box, and a gas generator is provided in the upper front part of the cooling dryer.

[0010] Preferably, the pulsating separation mechanism further includes a temperature control chamber. The processing tank has two independent temperature control chambers inside. A constant temperature circulation pump is provided on one side of the bottom of the discharge seat. The constant temperature circulation pump is connected to the interior of the two independent temperature control chambers inside the processing tank through a connecting pipe.

[0011] Preferably, the pulsating separation mechanism further includes a cooler, the cooler is provided at the top center of the bottom box, a sponge seat is provided at the bottom inner side of the bottom box, and multiple metal conduction plates are provided at the top of the inner wall of the bottom box. The interval between the multiple metal conduction plates forms a bent flow channel for the airflow of the rear side box. Multiple guide grooves are equally spaced on the surface of the metal conduction plates.

[0012] Preferably, the auxiliary processing mechanism includes a nitrogen conveyor, a nitrogen conveyor is provided at the lower middle part of the front end of the cooling dryer, a dispersion seat is provided on one side of the top of the granulation main unit box, one side of the front side box is connected to the interior of the dispersion seat through a conveying pipe, and a one-way valve is provided at the end of the conveying pipe.

[0013] Preferably, the terminal granulation mechanism includes a discharge pipe, a discharge pipe is provided on one side of the processing tank, the discharge pipe is connected to the inlet of the granulation main unit box, a suction conveyor is provided on the discharge pipe, a control box is provided on one side of the front end of the granulation main unit box, and a discharge section is provided in the upper middle part of one side of the granulation main unit box.

[0014] Working Principle: When granulating recycled polyester environmentally friendly plastics, workers first use a high-pressure water washing process to remove impurities and contaminants such as mud, sand, and oil from the surface. Then, an airflow drying process is used for pre-dehydration, removing most of the surface free water. After the surface free water is largely removed, a hot air drying process is used to initially remove residual moisture adsorbed inside the material. The pre-treated material is then conveyed into the recycling granulation equipment for further deep dehydration. The preliminary treatment mechanism then starts operating. Personnel open the sealed lid at the top of the processing tank and feed the pre-treated polyester-based environmentally friendly plastic raw material into the separation mesh inside the tank. After feeding, the personnel reset and lock the lid to ensure the tank is airtight. Then, the drive motor installed on the processing tank is started. When the drive motor runs, it drives the separation mesh inside the tank to rotate synchronously at high speed. The high-speed centrifugal force generated by the rotation of the separation mesh quickly throws the free water on the surface of the material through the permeable grid on the side wall of the mesh, achieving preliminary solid-liquid separation. During the rotation, the cylindrical airbag located in the center of the separation mesh and the rubber protrusions on its surface can move the material... Synchronous tumbling prevents material from adhering to the inner wall of the mesh cover and forming a fixed layer. Simultaneously, the elastic deformation of the cylindrical airbag generates a rebound force on the material, causing it to continuously tumble and collide during rotation, further enhancing the removal of surface free water. This completes the primary centrifugal dehydration treatment of the environmentally friendly plastic raw material. After the initial centrifugal dehydration, the micro-pump on the sealed cover starts operating, continuously filling the cylindrical airbag with gas. As the internal air pressure increases, the cylindrical airbag gradually expands. During expansion, the radial deformation of the airbag is controlled by the annular limiting sleeve. The system ensures that the airbag remains coaxial with the separation mesh, preventing misalignment. As the volume of the cylindrical airbag continues to increase, the material-accommodating gap between the outer wall of the airbag and the inner wall of the separation mesh gradually narrows. Under the combined action of the high-speed centrifugal force of the separation mesh and the radial extrusion force of the cylindrical airbag, the residual water in the pores inside the material is continuously squeezed out, achieving a deeper level of mechanical dehydration. The extruded water flows through the separation mesh into the discharge seat at the bottom of the treatment tank, and finally through the one-way valve and the external connecting pipe into the external water collection device for unified collection, thus completing the secondary extrusion-enhanced dehydration treatment of environmentally friendly plastic raw materials.Subsequently, the pulse separation mechanism is activated. After two stages of mechanical dehydration, most of the free water and pore water in the material have been removed. At this point, the rotary vane vacuum pump installed on the side of the processing tank starts operating. As the vacuum pump continues to pump air, a high vacuum environment is gradually formed inside the processing tank. Under this high vacuum environment, the boiling point of the water inside the material decreases significantly, and the adsorbed water inside rapidly vaporizes and migrates and diffuses to the material surface. Simultaneously, the constant temperature circulating pump continuously circulates the heat transfer medium in the temperature-controlled cavity inside the processing tank through external pipelines, keeping the temperature inside the tank stable throughout the vacuum pumping process. This prevents the material temperature from dropping due to heat absorption during vaporization, which would weaken the vaporization power of the water. The stable temperature environment and the high vacuum environment work synergistically to further accelerate the precipitation rate and vaporization diffusion efficiency of the water inside the material. When the vacuum vaporization diffusion stage inside the processing tank has run for the set time, the gas generator starts operating. The gas generator then pumps the purified water from the external filter into the tank. Clean air is introduced into the cooling dryer, where it is processed into low-dew-point dry air. This dry air is then evenly injected into the processing tank through a side box. The influx of low-dew-point dry air disrupts the vapor saturation equilibrium layer formed on the material surface, providing sufficient mass transfer power for the continuous outward migration of internal moisture. Combined with the constant-temperature heating of the temperature control chamber and the low-speed turning action of the separation screen, uniform drying of the material is achieved both inside and out. The temperature is controlled within a safe range throughout the process to prevent pre-hydrolysis degradation of the polyester material caused by high temperatures. The humidified airflow that has completed mass transfer in the processing tank is then exported from the other side box and flows into the bottom box at the bottom of the equipment. After entering the bottom box, the airflow flows slowly along the curved flow channel composed of multiple metal conduction plates. The cooler continuously cools the metal conduction plates, and the water vapor carried in the airflow quickly condenses into liquid water upon contact with the low-temperature metal plate surface. The condensate flows downward along the guide grooves on the surface of the metal conduction plates and finally drips into the sponge seat at the bottom for adsorption and collection. The dehydrated dry gas continues to circulate along the flow channel and is reintroduced into the processing tank, alternating with the vacuuming process to continuously perform a pulsed cycle of vacuum removal and dry air replacement. The cycle continues until the material's moisture content reaches the processing requirements, thus completing the pulsed vacuum deep drying treatment of environmentally friendly plastic materials. At the same time, the auxiliary processing mechanism is activated. When the pulsed drying process reaches the middle stage, after multiple rounds of vacuum and dry air circulation have been completed in the tank, the nitrogen conveyor delivers high-purity nitrogen supplied by an external gas source to the cooling dryer. After further dehumidification and cooling in the cooling dryer, the nitrogen is injected into the processing tank through the side box to participate in the circulation. After the low-temperature dry nitrogen enters the tank, it can quickly replace the saturated wet vapor in the pores of the material, more efficiently breaking the gas-liquid equilibrium interface, and promoting the continuous diffusion of deeply adsorbed water in the material to the surface and being carried out by the airflow.This method can penetrate into the internal pores of thick-walled materials to complete dehydration, effectively solve the problem of external dryness and internal wetness commonly existing in traditional drying processes, and ensure the overall drying uniformity of the materials. In the subsequent melting granulation process, the drying nitrogen gas in the side box enters the molten melt inside the granulation main machine box through the conveying pipe and the dispersion seat in a micro-precise injection manner. The nitrogen gas disperses in the melt to form a large number of tiny bubbles, which can greatly increase the mass transfer contact area of water vapor. During the process of the tiny bubbles floating in the melt, they will continuously entrain the bound water in the molecular gaps and migrate to the melt surface together, and then be quickly removed by the vacuum equipment supporting the granulation main machine box, realizing the deep removal of the molecular bound water that is difficult to remove by ordinary vacuum processes, thereby completing the deep dehydration auxiliary treatment of the environmentally friendly material during the melting granulation process. After that, the terminal granulation mechanism is started. The qualified materials that have been processed through multiple front-end processes and have reached the standard moisture content are sent into the granulation main machine box through the discharge pipe under the negative pressure suction of the material suction conveyor for melting granulation processing. During the granulation process, the staff can adjust various process parameters such as the melting temperature, screw speed, and pelletizing rate in real time through the control chassis. Finally, the uniformly shaped plastic pellets are output and collected through the discharge part, thus completing the full-process granulation processing of the environmentally friendly plastic.

[0015] The present invention provides a plastic granulator for processing environmentally friendly plastics. It has the following beneficial effects: 1. By adding and setting a preliminary separation mechanism, before processing the environmentally friendly plastic by granulation, this mechanism first uses the centrifugal force generated by the high-speed rotation of the separation mesh cover to efficiently remove the free water attached to the surface of the material, complete the primary solid-liquid separation after water washing, reduce the initial moisture content of the material. Secondly, with the radial extrusion of the expandable cylindrical airbag, the water retained in the internal pores of the material is further precipitated, strengthening the depth of mechanical dehydration and reducing the total amount of water entering the subsequent drying process, thus reducing the processing load of the deep dehumidification link from the front end.

[0016] 2. By adding and setting a pulsating separation mechanism, before processing the environmentally friendly plastic by granulation, this mechanism not only reduces the boiling point of water through a vacuum environment, promotes the vaporization and diffusion of the adsorbed water inside the material, breaks through the limitation of traditional hot air drying that can only remove surface water, and realizes the deep removal of the internal water of the material, but also cooperates with the pulsating replacement of constant temperature control and low dew point drying air to break the steam saturation balance on the surface of the material, improve the drying uniformity, and at the same time control the temperature within a safe range throughout the process to avoid the pre-hydrolysis degradation of the material caused by high temperature.

[0017] 3. By adding and setting auxiliary processing mechanisms, this invention can not only enhance the removal of pore water in thick-walled materials by replacing the wet vapor in the pores of the material with dry nitrogen during the pulse drying process, thus improving the defect of external dryness and internal wetness in traditional drying processes, but also remove the bound water between melt molecules through nitrogen gas lifting during the melt granulation stage, thereby further reducing the probability of hydrolysis reaction in the molten state and reducing bubble defects inside the melt.

[0018] 4. By adding and setting a terminal granulation mechanism, this invention enables the processing of environmentally friendly plastics. On the one hand, it relies on the deep dehydration of multiple front-end processes to complete the melting, plasticizing and granulation process under low moisture content conditions, effectively inhibiting the hydrolysis and chain breaking of ester bonds and avoiding a significant decrease in the mechanical properties of recycled materials. On the other hand, it can reduce the internal pores formed by the vaporization of water vapor in the melt, reduce appearance defects such as pitting and silver streaks on the particle surface, ensure the overall quality of recycled particles, and broaden the downstream application range of recycled materials. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the front structure of the present invention; Figure 2 This is a schematic diagram of the rear structure of the present invention; Figure 3 This is a cross-sectional view of the internal structure of the processing tank of the present invention; Figure 4 This is a schematic diagram of the internal structure of the separation mesh cover of the present invention; Figure 5 This is a partial structural diagram of the side box of the present invention; Figure 6 This is a partial structural diagram of the bottom box of the present invention; Figure 7 This is a cross-sectional view of the internal structure of the bottom box of the present invention; Figure 8 This is a partial structural diagram of the granulation main unit box of the present invention.

[0020] The components include: 1. Base box; 2. Constant temperature circulating pump; 3. Discharge seat; 4. One-way valve; 5. One-way exhaust valve; 6. Drive motor; 7. Miniature air pump; 8. Sealing cover; 9. Rotary vane vacuum pump; 10. Side box; 11. Suction conveyor; 12. Dispersion seat; 13. Conveying pipe; 14. Granulation main unit box; 15. Control box; 16. Gas generator; 17. Nitrogen conveyor; 18. Cooling dryer; 19. Refrigerator; 20. Discharge section; 21. Processing tank; 22. Discharge pipe; 23. Separation mesh cover; 24. Columnar airbag; 25. Rubber protrusion; 26. Annular limiting sleeve; 27. Sponge seat; 28. Metal conduction plate; 29. ​​Guide channel; 30. Bending flow channel; 31. One-way valve; 32. Temperature control chamber. Detailed Implementation

[0021] The technical solutions in 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.

[0022] Please see the appendix Figure 1 - Appendix Figure 2 This invention provides an environmentally friendly plastic granulator for plastic processing, including a bottom box 1. The top of the bottom box 1 is provided with a processing tank 21 for dehumidifying recycled plastic. A granulation main unit box 14 is provided on one side of the processing tank 21. The granulation main unit box 14 granulates the recycled plastic that has undergone multiple processing in the processing tank 21. Please see the appendix Figure 3 - Appendix Figure 4 The preliminary processing unit, which is located inside the processing tank 21, is used to perform preliminary dehumidification processing on the recycled plastic raw materials after the cleaning process. The preliminary processing mechanism includes a separation screen 23. The separation screen 23 is installed inside the processing tank 21. A sealing cover 8 is installed on one side of the processing tank 21. A drive motor 6 is installed in the middle of the sealing cover 8. When the drive motor 6 is running, its drive end drives the separation screen 23 inside the processing tank 21 to rotate. A discharge seat 3 is installed in the middle of the bottom end of the processing tank 21. A one-way valve 4 is installed in the middle of one side of the discharge seat 3.

[0023] When the preliminary treatment mechanism is started, the staff opens the sealing cover 8 on the top of the treatment tank 21 and puts the pre-treated polyester environmentally friendly plastic raw material into the separation mesh cover 23 inside the treatment tank 21. After the material is fed in, the staff puts the sealing cover 8 back in place and locks it to ensure the airtightness of the tank. Then, the drive motor 6 installed on the treatment tank 21 starts running. When the drive motor 6 runs, it drives the separation mesh cover 23 inside the treatment tank 21 to rotate synchronously at high speed. The high-speed centrifugal force generated by the rotation of the separation mesh cover 23 quickly throws the free water on the surface of the material out through the water-permeable grid on the side wall of the mesh cover, realizing the initial separation of solid and liquid.

[0024] The preliminary processing mechanism also includes a cylindrical airbag 24. A cylindrical airbag 24 is provided in the middle of the inner side of the separation mesh cover 23. A miniature air pump 7 is provided in the upper middle part of one side of the sealing cover 8 to inflate the cylindrical airbag 24. A one-way exhaust valve 5 is provided in the lower middle part of one side of the sealing cover 8 to exhaust the cylindrical airbag 24 after use. Multiple sets of rubber protrusions 25 are provided at equal intervals on the outer wall of the cylindrical airbag 24. Multiple annular limiting sleeves 26 are provided at equal intervals on the outer wall of the cylindrical airbag 24 to prevent it from deforming after inflation.

[0025] During the rotation, the cylindrical airbag 24 located at the center of the separation mesh 23 and the rubber protrusions 25 on its surface can drive the material to turn synchronously, preventing the material from adhering to the inner wall of the mesh and forming a fixed material layer. At the same time, the elastic deformation of the cylindrical airbag 24 will generate a rebound force on the material, causing the material to continuously turn up and down and collide with each other during the rotation, further enhancing the removal effect of surface free water, thereby completing the primary centrifugal preliminary dehydration treatment of environmentally friendly plastic raw materials.

[0026] After the environmentally friendly plastic raw material is initially centrifuged and dehydrated, the micro air pump 7 on the sealed cover 8 is started. When the micro air pump 7 is running, it continuously fills the cylindrical airbag 24 with gas. The cylindrical airbag 24 gradually expands as the internal air pressure increases. During the expansion process, the radial deformation of the airbag is constrained by the annular limiting sleeve 26 to ensure that the airbag always maintains the cylindrical shape coaxial with the separation net cover 23 and avoids displacement and misalignment.

[0027] As the volume of the cylindrical airbag 24 continues to increase, the material-accommodating gap between the outer wall of the airbag and the inner wall of the separation mesh 23 gradually narrows. Under the combined action of the high-speed centrifugal force of the separation mesh 23 and the radial extrusion force of the cylindrical airbag 24, the residual water in the pores inside the material is continuously squeezed out, achieving a deeper level of mechanical dehydration. The precipitated water flows through the separation mesh 23 into the discharge seat 3 at the bottom of the treatment tank 21, and is finally discharged into the external water collection device for unified collection through the one-way valve 4 and the external connecting pipe, thereby completing the secondary extrusion-enhanced dehydration treatment of the environmentally friendly plastic raw material.

[0028] Please see the appendix Figure 5 - Appendix Figure 7 The pulse separation mechanism is located on both sides of the processing tank 21 and is used to perform pulse-type reprocessing on the recycled plastic raw materials after the preliminary processing mechanism. The pulsating separation mechanism includes a rotary vane vacuum pump 9. The rotary vane vacuum pump 9 is installed at the top center of the processing tank 21 to evacuate its internal chamber. Side boxes 10 are installed on both sides of the processing tank 21. The front and rear side boxes 10 connect the processing tank 21 to the interior of the bottom box 1. A cooling dryer 18 is installed in the middle of the front side box 10. A gas generator 16 is installed in the upper front part of the cooling dryer 18.

[0029] When the pulse separation mechanism is started, after two-stage mechanical dehydration, most of the free water and pore water in the material have been removed. At this time, the rotary vane vacuum pump 9 installed on the side of the processing tank 21 starts to run. As the vacuum pump continues to pump air, a high vacuum environment is gradually formed inside the processing tank 21. Under the high vacuum environment, the boiling point of the water inside the material is greatly reduced, and the adsorbed water inside quickly vaporizes and migrates and diffuses to the surface of the material.

[0030] After the vacuum vaporization and diffusion stage in the treatment tank 21 has run for the set time, the gas generator 16 starts to run. The gas generator 16 sends clean air purified by the external filter into the cooling dryer 18. After being processed into low dew point dry air by the cooling dryer 18, it is evenly injected into the interior of the treatment tank 21 through the side box 10. After the low dew point dry air is filled in, it will break the vapor saturation equilibrium layer formed on the surface of the material, providing sufficient mass transfer power for the continuous outward migration of internal moisture. Combined with the constant temperature heating of the temperature control chamber 32 and the low-speed turning action of the separation screen 23, the material is dried evenly inside and out. The temperature is controlled within a safe range throughout the process to avoid pre-hydrolysis degradation of polyester material caused by high temperature.

[0031] The pulsating separation mechanism also includes a temperature control chamber 32. The processing tank 21 has two independent temperature control chambers 32 inside. A constant temperature circulation pump 2 is provided on one side of the bottom of the discharge seat 3. The constant temperature circulation pump 2 is connected to the inside of the two independent temperature control chambers 32 inside the processing tank 21 through a connecting pipe.

[0032] At the same time, the constant temperature circulating pump 2 continuously circulates the heat-conducting medium in the temperature-controlled cavity 32 inside the jacket of the barrel 21 through the external pipeline, so that the temperature inside the barrel remains stable during the vacuum pumping process. This avoids the material temperature from dropping due to vaporization heat absorption and weakening the moisture vaporization power. The stable temperature environment and the high vacuum environment work synergistically to further accelerate the precipitation rate and vaporization diffusion efficiency of the moisture inside the material.

[0033] The pulsating separation mechanism also includes a cooler 19. The cooler 19 is located at the top center of the bottom box 1. A sponge seat 27 is located at the bottom inner side of the bottom box 1. Multiple metal conduction plates 28 are located at the top of the inner wall of the bottom box 1. The intervals between the multiple metal conduction plates 28 form a bent flow channel 30 for the airflow to flow out of the rear side box 10. Multiple guide grooves 29 are evenly spaced on the surface of the metal conduction plates 28.

[0034] After mass transfer is completed in the processing tank 21, the humidified airflow is discharged from the side box 10 on the other side and flows into the bottom box 1 at the bottom of the equipment. After entering the bottom box 1, the airflow flows slowly along the curved flow channel 30 composed of multiple metal conduction plates 28. The cooler 19 continuously cools the metal conduction plates 28. The water vapor carried in the airflow condenses rapidly into liquid water after contacting the low-temperature metal plate surface. The condensed water flows down along the guide groove 29 on the surface of the metal conduction plate 28 and finally drips into the sponge seat 27 at the bottom and is absorbed and collected. The dehydrated dry gas continues to circulate along the flow channel and is sent back into the processing tank 21. It alternates with the vacuuming process to continuously perform the pulsed cycle of vacuum removal and dry air replacement. The cycle continues until the moisture content of the material reaches the processing requirements and then stops, thus completing the pulsed vacuum deep drying treatment of environmentally friendly plastic materials.

[0035] An auxiliary processing mechanism is located on both sides of the processing tank 21 and is used to assist in the discharge of moisture from the plastic raw materials recovered during the pulse separation process. The auxiliary processing mechanism includes a nitrogen conveyor 17. The nitrogen conveyor 17 is installed in the lower middle part of the front end of the cooling dryer 18. A dispersion seat 12 is installed on one side of the top of the granulation main unit box 14. One side of the front side box 10 is connected to the interior of the dispersion seat 12 through a conveying pipe 13. A one-way valve 31 is installed at the end of the conveying pipe 13.

[0036] When the auxiliary processing unit is started, after the pulse drying process has reached the middle stage and multiple rounds of vacuum and dry air circulation have been completed inside the barrel, the nitrogen conveyor 17 delivers high-purity nitrogen supplied by the external air source to the cooling dryer 18. After further dehumidification and cooling by the cooling dryer 18, the nitrogen is injected into the processing barrel 21 through the side box 10 to participate in the circulation. After the low-temperature drying nitrogen enters the barrel, it can quickly replace the saturated wet vapor in the pores of the material, more efficiently break the gas-liquid balance interface, and promote the continuous diffusion of the deeply adsorbed water in the material to the surface and carry it out with the airflow. This method can penetrate into the internal pores of thick-walled materials to complete dehydration, effectively solving the problem of external dryness and internal moisture that is common in traditional drying processes, and ensuring the overall uniformity of material drying.

[0037] In the subsequent melting and granulation process, the dry nitrogen in the side box 10 is introduced into the molten melt inside the granulation main unit box 14 through the conveying pipe 13 and the dispersion seat 12 in a micro-precise injection manner. The nitrogen disperses in the melt to form a large number of micro bubbles, which can greatly increase the mass transfer contact area of ​​water vapor. As the micro bubbles float in the melt, they will continuously carry the bound water in the intermolecular gaps to migrate to the surface of the melt. Then, they are quickly removed by the vacuum equipment matched with the granulation main unit box 14, realizing the deep removal of molecular bound water that is difficult to remove by ordinary vacuum processes. This completes the deep dehydration auxiliary treatment of environmentally friendly materials in the melting and granulation process.

[0038] Please see the appendix Figure 8 The terminal granulation unit, which is located on the granulation host box 14, is used to granulate the processed recycled plastic raw materials.

[0039] The terminal granulation mechanism includes a discharge pipe 22. The discharge pipe 22 is provided on one side of the processing tank 21. The discharge pipe 22 is connected to the inlet of the granulation main unit box 14. A suction conveyor 11 is provided on the discharge pipe 22. A control box 15 is provided on one side of the front end of the granulation main unit box 14. A discharge section 20 is provided on the upper middle part of one side of the granulation main unit box 14.

[0040] When the terminal granulation mechanism is started, qualified materials that have undergone multiple front-end processes and meet the moisture content standards are sent into the granulation host box 14 through the discharge pipe 22 under the negative pressure suction of the suction conveyor 11 for melt granulation processing. During the granulation process, the operator can control the melting temperature, screw speed, pelletizing rate and other process parameters in real time through the control box 15. The uniform plastic granules that are finally processed are discharged and collected through the discharge section 20, thus completing the whole process of granulation processing of environmentally friendly plastics.

[0041] 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. An environmentally friendly plastic granulator for plastic processing, characterized in that, include, The bottom box (1) has a processing tank (21) for dehumidifying recycled plastics on the top of the bottom box (1). A granulation main unit box (14) is provided on one side of the processing tank (21). The granulation main unit box (14) granulates the recycled plastics that have undergone multiple treatments in the processing tank (21). The preliminary processing unit is located inside the processing tank (21) and is used to perform preliminary dehumidification processing on the recycled plastic raw materials after the cleaning process; The pulse separation mechanism is located on both sides of the processing tank (21) and is used to perform pulse-type reprocessing on the recycled plastic raw materials after the preliminary processing mechanism. An auxiliary processing mechanism is set on both sides of the processing tank (21) to assist in the discharge of moisture from the plastic raw materials recovered during the pulse separation process. The terminal granulation mechanism is set on the granulation host box (14) and is used to granulate the processed recycled plastic raw materials.

2. The environmentally friendly plastic granulator for plastic processing according to claim 1, characterized in that, The preliminary processing mechanism includes a separation mesh cover (23), the processing barrel (21) is provided with a separation mesh cover (23), a sealing cover (8) is provided on one side of the processing barrel (21), a drive motor (6) is provided in the middle of the sealing cover (8), when the drive motor (6) is running, its drive end drives the separation mesh cover (23) inside the processing barrel (21) to rotate, a discharge seat (3) is provided in the middle of the bottom end of the processing barrel (21), and a one-way valve (4) is provided in the middle of one side of the discharge seat (3).

3. The environmentally friendly plastic granulator for plastic processing according to claim 2, characterized in that, The preliminary processing mechanism also includes a cylindrical airbag (24). A cylindrical airbag (24) is provided in the middle of the inner side of the separation mesh cover (23). A miniature air pump (7) for inflating the cylindrical airbag (24) is provided in the upper middle part of one side of the sealing cover (8). A one-way exhaust valve (5) for venting the cylindrical airbag (24) after use is provided in the lower middle part of one side of the sealing cover (8). Multiple sets of rubber protrusions (25) are provided at equal intervals on the outer wall of the cylindrical airbag (24). Multiple annular limiting sleeves (26) for preventing deformation after inflation are provided at equal intervals on the outer wall of the cylindrical airbag (24).

4. The environmentally friendly plastic granulator for plastic processing according to claim 2, characterized in that, The pulsating separation mechanism includes a rotary vane vacuum pump (9). The top center of the processing barrel (21) is equipped with a rotary vane vacuum pump (9) to evacuate the internal chamber. Side boxes (10) are provided on both sides of the processing barrel (21). The front and rear side boxes (10) connect the processing barrel (21) to the interior of the bottom box (1). A cooling dryer (18) is provided in the middle of the front side box (10). A gas generator (16) is provided in the upper middle part of the front end of the cooling dryer (18).

5. The environmentally friendly plastic granulator for plastic processing according to claim 4, characterized in that, The pulsating separation mechanism also includes a temperature control chamber (32). The processing tank (21) has two independent temperature control chambers (32) inside. A constant temperature circulation pump (2) is provided on one side of the bottom of the discharge seat (3). The constant temperature circulation pump (2) is connected to the inside of the two independent temperature control chambers (32) in the processing tank (21) through a connecting pipe.

6. The environmentally friendly plastic granulator for plastic processing according to claim 1, characterized in that, The pulsating separation mechanism also includes a cooler (19). The cooler (19) is provided at the top center of the bottom box (1). A sponge seat (27) is provided at the bottom inner side of the bottom box (1). Multiple metal conduction plates (28) are provided at the top of the inner wall of the bottom box (1). The interval between the multiple metal conduction plates (28) forms a bend flow channel (30) for the airflow to be discharged from the rear side box (10). Multiple guide grooves (29) are provided at equal intervals on the surface of the metal conduction plates (28).

7. The environmentally friendly plastic granulator for plastic processing according to claim 4, characterized in that, The auxiliary processing mechanism includes a nitrogen conveyor (17). The nitrogen conveyor (17) is provided at the lower middle part of the front end of the cooling dryer (18). A dispersion seat (12) is provided on one side of the top of the granulation main unit box (14). One side of the front side box (10) is connected to the interior of the dispersion seat (12) through a conveying pipe (13). A one-way valve (31) is provided at the end of the conveying pipe (13).

8. The environmentally friendly plastic granulator for plastic processing according to claim 1, characterized in that, The terminal granulation mechanism includes a discharge pipe (22). The discharge pipe (22) is provided on one side of the processing tank (21). The discharge pipe (22) is connected to the inlet of the granulation host box (14). A suction conveyor (11) is provided on the discharge pipe (22). A control box (15) is provided on one side of the front end of the granulation host box (14). A discharge section (20) is provided on the upper middle part of one side of the granulation host box (14).

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