An environmental protection and recycling processing device for EPP plastic waste parts

Abstract

This utility model relates to an environmentally friendly recycling and processing device for EPP plastic waste parts. The device includes a crusher for feeding and crushing EPP waste material into a mixture of granules and powder; a negative pressure fan connected to the outlet of the crusher to extract the crushed mixture; a cyclone separator including a shell with a material inlet and a gas outlet at the top and a material outlet at the bottom; a sieve with a screening inlet at the top and a granule outlet and a powder outlet at the bottom, with a filter screen between the granule outlet and the powder outlet; and an airlock connected to the granule outlet to allow the granular material to be discharged downwards. This device achieves graded recycling of materials, offering advantages such as improved material utilization, reduced processing costs, and reduced dust pollution.

Description

Technical Field

[0001] This utility model relates to the field of environmentally friendly recycling technology of EPP plastic waste parts, specifically to an environmentally friendly recycling and processing device for EPP plastic waste parts. Background Technology

[0002] EPP products are made from polypropylene foam resin. It is a type of foam plastic, a high-performance and environmentally friendly foam material with excellent properties such as high strength, high resilience, impact and corrosion resistance, and durability. It is widely used in various fields of modern production and daily life. However, in actual production and processing, due to issues with processes and quality, some molded EPP products are defective or scrapped. Manufacturers typically handle these scrapped parts by packaging them and sending them to upstream raw material suppliers for processing. However, because these parts are not usable, upstream suppliers incur additional recycling costs, leading to increased costs in EPP production and low raw material utilization.

[0003] EPP is a 100% recyclable material. Currently, there are generally two methods for recycling EPP: cold-press foam compressors and hot-melt foam machines. The former uses a cold press to crush the foam and compress it into blocks, while the latter involves pulverizing the product and melting it into blocks. Both of these methods result in blocks that can only be processed into specific products, limiting their subsequent processing capabilities and hindering the broad applicability of reuse. Utility Model Content

[0004] The purpose of this utility model is to provide an environmentally friendly recycling and processing device for EPP plastic waste parts, so as to solve the problems of low recycling and processing costs and limited reprocessing of EPP plastic waste parts in the prior art.

[0005] To solve the above problems, the environmentally friendly recycling and processing device for EPP plastic waste parts involved in this utility model adopts the following technical solution:

[0006] EPP plastic waste recycling and processing equipment, including

[0007] A crusher for feeding EPP waste materials and crushing them into a mixture of granules and powder;

[0008] A negative pressure fan is connected to the outlet of the pulverizer to extract the pulverized mixture.

[0009] A cyclone separator includes a shell, with a material inlet and a gas outlet at the top of the shell and a material outlet at the bottom of the shell;

[0010] The sieve has a sieve inlet at the top and a particle outlet and a powder outlet at the bottom, with a filter screen between the particle outlet and the powder outlet.

[0011] The airlock is connected to the particle outlet to allow the granular material to be discharged downwards.

[0012] Furthermore, the screening cylinder includes a cylinder body arranged coaxially with the shell, the inner hole of which forms a screening channel, and the screening inlet and particle outlet are distributed at the upper and lower ends of the cylinder body.

[0013] The filter screen is positioned between the powder outlet and the inner hole to separate the particulate and powder materials when the mixture approaches the filter screen.

[0014] Furthermore, the cylinder body includes an outer sleeve and an inner sleeve with a coaxial insert.

[0015] An annular space is formed between the outer cylinder and the inner cylinder. The filter screen is arranged on the inner cylinder, and the powder outlet is arranged on the bottom side of the side wall of the outer cylinder.

[0016] Furthermore, the inner cylinder includes two coaxially spaced end cylinders arranged in opposite directions. The two end cylinders are respectively inserted and fixed at both ends of the outer cylinder, and the filter screen is cylindrical and connected between the two end cylinders.

[0017] Furthermore, a particle conveying pipe for connecting to a hopper is provided below the particle outlet.

[0018] Furthermore, a powder bag is connected to the powder outlet.

[0019] Furthermore, a bag filter is connected to the gas outlet.

[0020] The beneficial effects of this utility model are as follows: Compared with the prior art, the environmentally friendly recycling and processing device for EPP plastic waste parts involved in this utility model, in actual use, forms a granular powder mixture through a crusher, and combines the synergistic effect of a negative pressure fan, a cyclone separator and a sieve to achieve graded recycling of materials, which has the advantages of improving material utilization, reducing processing costs and reducing dust pollution.

[0021] Meanwhile, it effectively solves the problem of granules and powder mixing during EPP waste part recycling. The separated granules can be directly used for injection molding, while the powder can be used as filler material, increasing the utilization rate of recycled materials to over 95%. The material conveying process is carried out in a closed system, avoiding dust pollution and reducing manual intervention. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly described below:

[0023] Figure 1This is a schematic diagram of a specific embodiment of the environmentally friendly recycling and processing device for EPP plastic waste parts of this utility model.

[0024] Figure 2 for Figure 1 Another perspective structural diagram;

[0025] Figure 3 for Figure 2 Cross-sectional view of the separated section;

[0026] Figure 4 for Figure 2 Schematic diagram of the intermediate sieve and powder filter bag;

[0027] Figure 5 for Figure 4 Half-sectional view of the intermediate sieve.

[0028] Explanation of reference numerals in the attached diagram: 1-Pulverizer; 2-Negative pressure fan;

[0029] 3-Cyclone separator; 31-Shell; 32-Material inlet; 33-Material outlet; 34-Exhaust port;

[0030] 4-Sieve separator; 41-Outer sleeve; 42-End sleeve; 43-Filter screen; 44-Sieve inlet; 45-Particle outlet; 46-Powder outlet;

[0031] 5-Airlock; 6-Conveying pipe; 7-Powder filter bag; 8-Bag dust collector; 9-Drive motor. Detailed Implementation

[0032] To make the technical objectives, technical solutions, and beneficial effects of this utility model clearer, the technical solution of this utility model will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model; that is, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0033] Currently, existing EPP waste parts are directly recycled and crushed, then compressed into blocks using cold pressing or hot melting. This complete plasticization limits the wide applicability of the material, and upstream manufacturers incur additional costs during recycling, leading to low raw material utilization and increased processing costs for manufacturers. To address these issues, the applicant's R&D team, through repeated experiments, discovered that when products are cut open, the surface layer, due to direct contact with high-temperature steam, is relatively fully plasticized, forming a relatively tough polypropylene wall. The overall structure is compressed into sheets, resulting in a brittle surface. However, the internal structure, not directly exposed to high-temperature steam, is affected by the high temperature during compression molding, causing internal particles to stack and adhere to each other. Furthermore, the internal structure of the particles, due to foaming technology, forms an independent closed-loop structure, preventing complete plasticization. Based on these material characteristics of existing EPP products, the applicant has developed a related recycling and processing device to recycle and reuse EPP waste parts.

[0034] Specific embodiments of the environmentally friendly recycling and processing device for EPP plastic waste parts involved in this utility model are as follows: Figures 1 to 5 As shown, the surface and internal materials of EPP waste parts exhibit significant differences in particle size after crushing due to varying degrees of heating. By analyzing the material's motion characteristics in the airflow, a method combining negative pressure conveying and centrifugal sieving is proposed to achieve physical separation of particles and powder. Further research into the relationship between material suspension and density leads to the design of a multi-stage separation structure, ensuring efficient classification of materials with different particle sizes during the sieving process.

[0035] The processing device includes a crusher 1, a negative pressure fan 2, a cyclone separator 3, a sieve, and an airlock 5. The crusher 1 crushes EPP plastic waste parts into a mixture, the negative pressure fan 2 pumps the material to the cyclone separator 3 for preliminary separation, and then the material enters the sieve to achieve fine screening of particles and powder through the filter screen 43. The airlock 5 controls the output of the particulate material.

[0036] Specifically, the structure of the crusher 1 is consistent with existing technology. It can mechanically crush EPP waste parts using rotating blades, specifically using a dual-shaft shear crusher 1, with adjustable blade spacing to control the particle size of the crushed material. The negative pressure fan 2 is the power device that generates negative pressure airflow, which can be implemented using a centrifugal fan. The crushed mixture is sucked into the conveying system through a pipeline connection. To simplify the drive, the drive shaft of the negative pressure fan 2 and the drive shaft of the crusher 1 can be coaxially connected. When the drive motor 9 works, it drives the crusher 1 to crush the material and simultaneously drives the negative pressure fan 2 to extract the crushed material. The cyclone separator 3 is a structure that uses centrifugal force to achieve gas-solid separation. It adopts a conical cylindrical structure, with the material inlet 32 ​​located in the top tangential direction to form a vortex, material discharge at the bottom, and exhaust at the top. The sieve separator 4 uses a screen separation method, and the separation accuracy of particles and powder is controlled by adjusting the screen mesh. The structure and principle of the airlock 5 are consistent with existing technology. The rotary valve that controls the material discharge speed can be implemented using a star-shaped discharge valve, and the rotor speed is adjusted to match the downstream conveying speed. At the same time, it prevents gas in the cyclone separator 3 from being discharged from the material outlet 33.

[0037] Specifically, after EPP waste parts are fed into the crusher 1, they are crushed into a mixture. The airflow generated by the negative pressure fan 2 transports the material to the cyclone separator 3. Inside the cyclone separator 3, the mixture and gas move downwards along the separator shell 31 in a swirling direction to the material outlet 33. Due to the setting of the airlock 5, the gas pressure increases. At this time, the air pressure near the central axis of the shell 31 is relatively small, and the gas is discharged outwards through the exhaust port 34 along the axis. The mixture, due to its own weight and centrifugal force, remains near the material outlet 33. In the screener 4, the granular material is blocked by the filter screen 43 and falls into the bottom particle outlet 45 for discharge, while the powder material passes through the filter screen 43 and is discharged from the side through the powder outlet 46. The airlock 5 uses rotating blades to quantitatively transport the granular material to the downstream silo, completing the graded recycling of the material.

[0038] Traditional cold pressing and hot melting methods compress materials into blocks, limiting subsequent processing. This solution achieves refined recycling of granules and powders through separation and screening. Furthermore, the hot melting method damages the physical structure of the material. This solution preserves the complete shape of the granules, which can be directly mixed with the raw material foamed granules. It eliminates the need for multiple manual sorting processes and achieves continuous processing through negative pressure conveying and automatic screening, significantly improving production efficiency, reducing enterprise production costs, and increasing material utilization.

[0039] Preferably, to further satisfy the sieving of granular and powder materials, the sieve 4 includes a cylinder, which is coaxially arranged with the shell 31. Its inner hole forms a sieving channel, and the sieving inlet 44 and granular outlet 45 are distributed at the upper and lower ends of the cylinder. A filter screen 43 is positioned between the powder outlet 46 and the inner hole to sieve the granular and powder materials when the mixture approaches the filter screen 43. The cylinder is a cylindrical structure, coaxially arranged with the shell 31 of the cyclone separator 3, and its inner diameter is consistent with the inner diameter of the material outlet 33, ensuring that the mixture remains uniformly distributed during sieving and remains in a centrifugal swirling flow state within the cylinder. The sieving inlet 44 and granular outlet 45 are distributed at both ends of the cylinder, which can promote the separation of granules and powders by gravity, while the filter screen 43 achieves dynamic sieving of the mixture.

[0040] The design of keeping the inner diameter of the sieve 4 consistent with the inner diameter of the material outlet 33 has the main function of effectively extending the swirling flow path of the gas and the mixture, so that the gas and the mixture still maintain a swirling downward flow path in the cylinder, which facilitates the subsequent separation of powder and particles by centrifugal force.

[0041] Specifically, the mixture of material and gas enters the screen 4 through the material outlet 33 in a swirling direction. After passing through the screening inlet 44, it flows downwards along the side wall of the cylinder under the action of gravity and centrifugal force. During the flow, due to centrifugal force, the mixture of material and gas always tends to flow outwards radially. When the mixture is close to the filter screen 43, large particles are blocked in the filter screen 43 by centrifugal force and gas propulsion, while small powder particles are discharged outwards along with a small amount of gas through the powder outlet 46. Due to the airlock effect of the airlock device 5 at the bottom of the cylinder and the fact that the outlet diameter of the powder outlet 46 is smaller than the inner diameter of the cylinder, the gas pressure inside the cylinder is greater than the gas pressure inside the separator. Most of the gas enters vertically upwards from near the central axis of the cylinder into the cyclone separator 3 and is discharged outwards through the exhaust port 34 along the central axis of the cyclone separator 3. The cylinder and the cyclone separator 3 are arranged coaxially with the same inner diameter, so that the material forms a spiral motion trajectory under the multiple effects of centrifugal force, gravity and wind force, which enhances the separation effect of granular material and powder material.

[0042] The three-dimensional screening space formed by the cylinder, combined with the synergistic effect of centrifugal force, gravity and wind, allows the material to be screened during dynamic rotation, significantly improving screening efficiency. At the same time, it avoids screen blockage caused by local accumulation, and the three-dimensional screening channel extends the screening path of the material, improving separation accuracy.

[0043] In a preferred embodiment, the sieve 4 includes an outer sleeve 41 and a coaxially inserted inner cylinder, forming an annular space between the outer sleeve 41 and the inner cylinder. A filter screen 43 is arranged on the inner cylinder, and a powder outlet 46 is arranged on the bottom side wall of the outer sleeve 41. The inner cylinder is coaxially inserted inside the outer sleeve 41, and can be implemented using a multi-segment spliced ​​cylinder. The filter screen 43 is arranged on its surface to achieve the sieving function. By adjusting the diameter difference between the inner and outer cylinders, an annular gap area is formed between the outer sleeve 41 and the inner cylinder to accommodate the powder material passing through the filter screen 43. After the mixed material enters the sieving channel of the inner cylinder from the sieving inlet 44, the granular material, due to its larger volume, is blocked by the filter screen 43 and falls down the inner cylinder to the particle outlet 45, while the powder material passes through the filter screen 43 and enters the annular space. Since the powder outlet 46 provided on the bottom side wall of the outer sleeve 41 is connected to the annular space, the powder moves downward along the annular space under the action of swirling wind force and is discharged from the powder outlet 46. The separate structure of the inner and outer cylinders allows the inner cylinder to be disassembled and operated separately during the maintenance of the filter screen 43. The design of the circumferential space avoids the accumulation and blockage of powder during the sieving process, and realizes the directional discharge of powder.

[0044] More preferably, the inner cylinder includes two coaxially spaced end cylinders 42 arranged in opposite directions. The two end cylinders 42 are respectively inserted and fixed at both ends of the outer cylinder 41. The filter screen 43 is cylindrical and connected between the two end cylinders 42. The cylindrical filter screen 43 is a filter structure arranged circumferentially around the inner cylinder. Specifically, it can be made of rolled metal wire mesh or nylon mesh and connected between the two end cylinders 42 to form a continuous filter surface, realizing full circumferential screening of the mixed material. After the mixed material enters the screening channel of the inner cylinder from the screening inlet 44, the particulate material falls directly to the particulate outlet 45 under the action of gravity, and the powder material passes through the cylindrical filter screen 43 with the airflow and enters the circumferential space, and is finally discharged from the powder outlet 46. The two end cylinders 42 are fixed to both ends of the outer cylinder 41 by inserts, so that the inner cylinder forms a detachable split structure. When the filter screen 43 needs to be replaced or maintained, only the end cylinders 42 need to be separated to complete the operation. Of course, in other embodiments, the end cylinders 42 and the outer cylinder 41 can also be formed by welding. The cylindrical filter screen 43 forms a continuous filter surface through a full circumferential arrangement, which has higher screening efficiency and is less prone to material accumulation. It increases the effective screening area, making the screening of powder materials more thorough, while avoiding the blockage caused by local accumulation of materials on the filter surface.

[0045] In addition, in order to achieve separate conveying of the mixed materials and gas, a particle conveying pipe 6 for connecting to the silo is connected below the particle outlet 45; a powder filter bag 7 is connected to the powder outlet 46; and a bag filter dust collector 8 is connected to the gas outlet.

[0046] In this process, after the granular material is discharged from the granule outlet 45 of the screen 4, the material flow rate is controlled by the airlock 5, and then it enters the granule conveying pipe 6. The granule conveying pipe 6 continuously conveys the material to the silo through mechanical or negative pressure pneumatic means. The silo is connected to the conveying pipe 6 through a sealed interface to ensure that the conveying process is in a closed state. During this process, the granular material and the powder material are completely isolated to avoid secondary mixing, and at the same time, the material's contact with air is reduced to prevent moisture or contamination. This ensures that the granular material is quickly transferred to a dedicated storage space after screening to avoid changes in physical properties caused by environmental exposure, while improving material conveying efficiency and providing a pure and stable supply of raw materials for subsequent reprocessing stages.

[0047] The powder filter bag 7 is a filtration device used to collect and store the sieved powder material. It is made of a breathable textile material that blocks powder passage, such as polyester or nylon, and is fixed to the end of the powder outlet 46 by a flange or clamp. During the sieving process, the powder filter bag 7 effectively intercepts fine powder particles, preventing powder from drifting into the external environment during discharge, and facilitates centralized collection and processing. After the separator 4 separates the particles from the powder, the powder material enters the powder filter bag 7 through the powder outlet 46. The breathability of the powder filter bag 7 allows airflow while trapping the powder inside the bag, thus achieving closed-loop powder collection. When a certain amount of powder accumulates inside the bag, it can be cleaned by disassembling or opening the bottom discharge port, and the collected powder can be transported to a designated area for cold pressing or hot melting reprocessing. This achieves directional collection and closed-loop storage of powder material, avoiding environmental pollution caused by powder drift, and improving the convenience of powder reuse.

[0048] The baghouse dust collector 8 is designed to trap micron-sized dust particles carried by the gas on the surface of the filter bags as they pass through the gaps between the filter fibers during the separation of the mixed materials. The purified gas is then discharged from the exhaust pipe. The separated gas, carrying residual dust, rises and exits from the gas outlet. At this point, the filter bags of the baghouse dust collector 8 perform secondary filtration of the dust-laden gas. When a certain thickness of dust layer accumulates on the surface of the filter bags, the accumulated dust is periodically removed by a pulse-jet cleaning device to maintain the filtration resistance within a controllable range. This process achieves deep purification of the exhaust gas before emission, preventing pollution of the production environment.

[0049] The above-mentioned processing device is implemented as follows:

[0050] Based on the different degrees of heating and plasticization of the surface and internal materials of EPP waste products, the EPP waste parts are crushed into a mixture of materials with different particle sizes, and the particulate materials in the mixture are recycled and reused; including the following steps:

[0051] (1) Crushing: Crushing the waste parts into a mixture, wherein the surface material is crushed into powder and the internal material is crushed into granules;

[0052] (2) Screening: The crushed mixture is screened according to its volume, density and suspension degree to separate the internal particles from the surface powder.

[0053] (3) Store separately, transporting granular materials and powdered materials to different silos for storage;

[0054] (4) Reprocessing: mixing granular materials with granular raw materials for reprocessing, and cold pressing or hot melting of powder materials for reprocessing.

[0055] The surface material is pulverized into powder by utilizing its high temperature and plasticity, which increases its brittleness and toughness. During pulverization, the surface particles are preferentially broken into smaller powdery substances. The internal material is pulverized into granules by utilizing its low plasticity and low density. During pulverization, particles are preferentially separated to form larger granules. The volume and density differences in the sieving step are used to separate particles and powders based on their suspension velocities in the airflow. This can be achieved using a cyclone separation method combining centrifugal and gravitational fields, which improves sorting efficiency. Separate storage involves using independent sealed containers to store particles and powders separately. This can be achieved by configuring six pneumatic conveying pipes and an automatic metering device, preventing cross-contamination. The mixing ratio control in the reprocessing step involves blending recycled and virgin particles at a preset ratio. This can be achieved using a loss-in-weight feeder for continuous mixing, ensuring the stability of the recycled material's performance.

[0056] After being processed by the shredder 1, the waste parts form a mixture. The brittle surface material is preferentially crushed into powder due to thermal differences, while the internal incompletely plasticized material remains in granular form. The mixture is conveyed to the screening system by negative pressure airflow. Under the combined action of centrifugal force and gravity, the larger particles fall along the screening channel to the particle outlet 45, while the smaller powder is carried by the airflow through the filter screen 43 and enters the powder collection device. The sorted particles and powder enter independent silos through the airlock 5 and conveying pipe 6, respectively. The granular material is proportioned and injection molded together with the virgin material, while the powder material is cold-pressed or hot-melt granulated to form recycled raw materials.

[0057] Through step-by-step crushing and multi-stage screening, the recycled materials are formed into two forms: granules and powder. The granules can be directly mixed into virgin materials to restore their performance, while the powder can be processed into low-density filler materials through molding processes. This solves the problem of limited processing when recycling EPP waste parts. The mixed use of granular materials and virgin materials can reduce raw material procurement costs. The cold pressing molding of powder materials avoids the energy loss of hot melting processes. The sorting and storage process enables materials of different forms to be adapted to various processing methods such as injection molding and compression molding, effectively improving the application range and utilization rate of recycled materials.

[0058] Preferably, the screening process described above employs centrifugal filtration screening. During centrifugation, smaller powder particles are filtered out, while larger particles fall due to gravity. In the centrifugal filtration screening process, the mixture is fed into a rotating screening device, which contains a cylindrical screen. When the device rotates at high speed, powder particles are thrown towards the screen under centrifugal force and discharged through the screen openings to an external collection device; while larger particles cannot pass through the screen and slide down the inner wall of the screen to the bottom outlet under their own gravity. The rotation speed of the screening device is adjustable to accommodate the separation requirements of materials with different particle sizes.

[0059] Centrifugal filtration and sieving combine centrifugal force with sieving to quickly separate powders from granules, while reducing the risk of screen clogging. This method is particularly suitable for materials with small density differences. It ensures thorough separation of granular and powder materials, preventing performance degradation caused by mixing during subsequent processing, reducing equipment maintenance frequency, and improving the overall stability of the processing flow.

[0060] Furthermore, preferably, the weight percentage of the granular material in the mixture of granular material and foamed granular raw material is no more than 30%. The granular material is recycled material formed by crushing the internal material of waste parts; specifically, it can be formed by crushing the incompletely plasticized portion of waste EPP parts, with its particle size controlled within a specific range. The granular raw material is unused new polypropylene foaming resin raw material; specifically, it can be original granules with a particle size similar to the recycled granules to ensure uniform mixing.

[0061] In the reprocessing stage, granular materials are mixed with granular raw materials in a preset ratio. During the mixing process, the amount of granular material incorporated is controlled to be within 30% of the total mass. By limiting the proportion of recycled particles, it is ensured that the mixed material maintains sufficient fluidity during the melt plasticizing stage, avoiding processing temperature fluctuations or molding defects caused by an excessively high proportion of recycled material. In the injection molding process, when the proportion of recycled particles exceeds 30%, the melt viscosity may increase significantly, affecting the mold filling effect; however, by controlling the ratio, the material processing stability can be maintained. By limiting the proportion of recycled particles, efficient utilization of waste materials is achieved while ensuring material performance, and the impact of excessive incorporation on processing equipment and the quality of the final product is avoided. While maintaining injection molding efficiency and product strength, the amount of recycled particles can be increased to a critical value, which reduces raw material consumption and avoids problems such as decreased melt fluidity and increased product shrinkage caused by excessive incorporation.

[0062] Of course, in other embodiments, the mixing ratio of particulate material and foamed granule raw material can also be arbitrarily designed according to the actual plasticization of the material particles.

[0063] Finally, it should be noted that the above embodiments are only for illustration and not for limiting the technical solutions of this utility model. Any equivalent substitutions and modifications or partial substitutions that do not depart from the spirit and scope of this utility model should be covered within the scope of protection of the claims of this utility model.

Claims

1. An environmentally friendly recycling and processing device for EPP plastic waste parts, characterized in that, include A crusher for feeding EPP waste materials and crushing them into a mixture of granules and powder; A negative pressure fan is connected to the outlet of the pulverizer to extract the pulverized mixture. A cyclone separator includes a shell, with a material inlet and a gas outlet at the top of the shell and a material outlet at the bottom of the shell; The sieve has a sieve inlet at the top and a particle outlet and a powder outlet at the bottom, with a filter screen between the particle outlet and the powder outlet. The airlock is connected to the particle outlet to allow the granular material to be discharged downwards.

2. The environmentally friendly recycling and processing device for EPP plastic waste parts according to claim 1, characterized in that, The screening cylinder includes a cylinder body arranged coaxially with the shell, the inner hole of which forms a screening channel, the inner diameter of the cylinder body is consistent with the inner diameter of the material outlet, and the screening inlet and particle outlet are distributed at the upper and lower ends of the cylinder body. The filter screen is positioned between the powder outlet and the inner hole to separate the particulate and powder materials when the mixture approaches the filter screen.

3. The environmentally friendly recycling and processing device for EPP plastic waste parts according to claim 2, characterized in that, The cylinder body includes an outer sleeve and an inner sleeve with a coaxial insert. An annular space is formed between the outer cylinder and the inner cylinder. The filter screen is arranged on the inner cylinder, and the powder outlet is arranged on the bottom side of the side wall of the outer cylinder.

4. The environmentally friendly recycling and processing device for EPP plastic waste parts according to claim 3, characterized in that, The inner cylinder includes two coaxially spaced end cylinders facing away from each other. The two end cylinders are respectively inserted and fixed at both ends of the outer cylinder. The filter screen is cylindrical and connected between the two end cylinders.

5. The environmentally friendly recycling and processing device for EPP plastic waste parts according to any one of claims 1-4, characterized in that, Below the particle outlet is a particle conveying pipe for connecting to the silo.

6. The environmentally friendly recycling and processing device for EPP plastic waste parts according to any one of claims 1-4, characterized in that, A powder bag is connected to the powder outlet.

7. The environmentally friendly recycling and processing device for EPP plastic waste parts according to any one of claims 1-4, characterized in that, A bag filter is connected to the gas outlet.

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