A dust removal drying equipment for plastic sorting

Abstract

The utility model discloses a kind of dust removal drying equipment for plastic sorting, belong to the technical field of plastic recycling, including processing chamber, dust removal component and heating component. The both ends of processing chamber are respectively provided with feed inlet and discharge outlet, and the inside of processing chamber is provided with pusher mechanism. Dust removal component includes air inlet and air outlet respectively arranged at the both ends of processing chamber. Heating component is used to heat processing chamber. Processing chamber is used as the passage of material flow, and the inside is provided with pusher mechanism to ensure that material is continuously conveyed in closed space. Dust removal component provides airflow passage and forms dust removal airflow between air inlet and air outlet, separates dust from plastic. Heating component heats processing chamber, so that material in it is heated and dried during conveying process, and airflow can carry dust and steam out of air outlet. The integration of dust removal and drying is realized, the space occupation and energy consumption caused by equipment series connection are reduced, and the efficiency of simultaneous removal of dust and moisture is improved.

Description

Technical Field

[0001] This utility model belongs to the field of plastic recycling technology, specifically a plastic sorting, dust removal and drying equipment. Background Technology

[0002] In the process of plastic recycling, waste plastics typically come from a wide range of sources, such as household waste, industrial scraps, and packaging materials. After recycling, these plastics often contain impurities such as dust, fibers, sand, and oil. Therefore, large pieces of plastic need to undergo crushing and washing processes to remove these impurities. The mixture after washing and crushing often still contains a large amount of moisture and dust. If it is not adequately pre-treated and directly enters subsequent stages, it can easily cause problems such as impurities affecting product quality, moisture affecting processing stability, equipment wear and blockage.

[0003] To address the aforementioned issues, existing technologies generally employ separate dust removal and drying equipment. Some processes first remove lightweight impurities through air separation or sieving, and then use a hot air dryer or centrifugal dehydrator to remove moisture. For example, patent CN204263406U discloses an integrated device for washing, dehydrating, drying, and dust removal of waste plastics. Small-sized flake or granular plastics are conveyed to a rinsing machine via a feeder for washing, impurity removal, and sorting. The separated plastics are then conveyed to a dehydrator via a floating screw conveyor or a submersible screw conveyor for dehydration. After dehydration, the material is fed into a cyclone separator via an induced draft fan I through a folded duct for drying and dust removal.

[0004] However, this process has the following drawbacks: dust removal and drying are separate units, requiring multiple sets of equipment to be connected in series, which takes up a lot of space, is complicated to operate, and has high energy consumption; dust and moisture often coexist, and it is difficult to improve efficiency at the same time whether dust removal is done first and then drying or drying is done first and then dust removal, which easily leads to residues. Utility Model Content

[0005] The purpose of this invention is to provide a plastic sorting, dust removal, and drying device to solve the problems mentioned in the prior art.

[0006] A plastic sorting, dust removal, and drying device is provided, comprising: The processing chamber has an inlet and an outlet at both ends, and a pushing mechanism is installed inside the processing chamber. The dust removal assembly includes an air inlet and an air outlet respectively located at both ends of the processing chamber; Heating components, used for heating the treatment chamber.

[0007] As a further embodiment of this utility model: multiple processing chambers are connected in series and arranged sequentially in the vertical direction to form a series group.

[0008] Multiple processing chambers are connected vertically in series to form a multi-stage drying and dust removal system. The material is advanced from top to bottom, undergoing multiple heating and airflow treatments in sequence. This arrangement extends the material residence time, improving the thoroughness of drying and dust removal; the vertical layout also helps improve space utilization and reduce equipment footprint.

[0009] As a further embodiment of this utility model: multiple series groups are connected in parallel to each other and arranged sequentially along the horizontal direction to form parallel groups.

[0010] Multiple series units are arranged in parallel along the horizontal direction to form parallel processing units, allowing materials to be diverted into different units for independent processing. This increases overall throughput and capacity, adapts to large-scale plastic recycling scenarios, and avoids the efficiency bottleneck of single-channel processing.

[0011] As a further embodiment of this utility model, an air suction pipe is provided at the discharge collection port of the parallel group.

[0012] The suction duct creates negative pressure to collect the dust-removed and dried plastic granules or fragments from various parallel channels. Utilizing pneumatic conveying principles, the plastic granules are directly sucked away and sent to downstream processing equipment. This achieves seamless integration between the dust removal and drying processes and downstream processes, reducing manual handling and mechanical conveying equipment in intermediate links, simplifying the process, and maintaining the material's dispersed state through pneumatic conveying to prevent the plastic from accumulating again or absorbing moisture.

[0013] As a further embodiment of this utility model: the pushing mechanism is a screw rotatably connected inside the processing chamber.

[0014] The feeding mechanism uses a screw to propel the material forward during rotation, while simultaneously turning and breaking it up. This ensures uniform heating of the material and avoids localized residual moisture or dust; conveying and mixing are carried out simultaneously, improving the uniformity of drying and dust removal.

[0015] As a further embodiment of this invention, the dust removal assembly further includes a filter, which is connected to the air outlet.

[0016] A filter is installed at the air outlet to filter out other phases carried by the airflow before discharge, providing a basis for airflow circulation. The airflow circulation system utilizes the heat provided by the heating components to form a heat circulation, realizing waste heat utilization and reducing energy consumption.

[0017] As a further embodiment of this utility model: the filter includes a dust removal filter and a dehumidifier connected in sequence to the air outlet.

[0018] The filter is equipped with a dust filter and a dehumidifier in sequence. The former traps particulate matter, while the latter further removes moisture from the airflow to ensure that the exhaust is dry and clean, and to prevent the material from becoming damp again due to moisture backflow.

[0019] As a further embodiment of this utility model, the dust removal assembly also includes a supplementary heating chamber located between the inlet and the outlet.

[0020] By continuously replenishing heat in the heating chamber, the temperature of the processing chamber is kept uniform, preventing incomplete drying of materials due to heat loss during transportation, ensuring stable temperature throughout the entire processing process, and improving drying quality.

[0021] As a further embodiment of this utility model: the heating assembly includes a base disposed at the bottom of the processing chamber and an electromagnetic coil disposed inside the base.

[0022] The heating element uses a base and an electromagnetic coil. Electromagnetic heating can quickly heat the bottom metal plate and conduct the heat to the processing chamber. Electromagnetic heating can achieve energy saving and temperature control.

[0023] As a further embodiment of this utility model, the bottom of the processing chamber is composed of an arc-shaped plate.

[0024] The bottom of the processing chamber adopts an arc-shaped plate structure. This arc-shaped plate, combined with electromagnetic heating, improves heating uniformity and prevents material accumulation in corners. This enhances the consistency of material drying, reduces dead corners and residues, and strengthens electromagnetic coupling, thereby improving thermal efficiency.

[0025] Compared with the prior art, the beneficial effects of this utility model are as follows: The processing chamber serves as a channel for material flow, with an internal pushing mechanism ensuring continuous material transport within the enclosed space. The dust removal system provides an airflow channel and creates a dust-removing airflow between the inlet and outlet, separating dust from the plastic. The heating system heats the processing chamber, drying the material during transport, while the cooperating airflow carries dust and steam out through the outlet. This integrated dust removal and drying process reduces space occupation and energy consumption associated with serial equipment, while simultaneously improving the efficiency of simultaneous dust and moisture removal. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this drawing or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this drawing. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0027] Figure 1 A schematic diagram of the overall structure of a dust removal and drying equipment for plastic parts. Figure 2 A partial structural diagram of a dust removal and drying equipment selected for plastic parts.

[0028] In the diagram: 1. Processing chamber; 11. Feed inlet; 12. Discharge outlet; 13. Pushing mechanism; 2. Dust removal assembly; 21. Air inlet; 22. Air outlet; 23. Filter; 231. Dust removal filter screen; 232. Dehumidifier; 24. Compensation chamber; 3. Heating assembly; 31. Base support; 4. Suction pipe. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this application clearer, the application is described and illustrated below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. All other embodiments obtained by those skilled in the art based on the embodiments provided in this application without inventive effort are within the scope of protection of this application.

[0030] Obviously, the accompanying drawings described below are merely some examples or embodiments of this application. Those skilled in the art can apply this application to other similar scenarios based on these drawings without any inventive effort. Furthermore, it is understood that although the efforts made in this development process may be complex and lengthy, for those skilled in the art related to the content disclosed in this application, any changes to design, manufacturing, or production based on the technical content disclosed in this application are merely conventional technical means and should not be construed as insufficient disclosure of the content of this application.

[0031] However, there may be instances where unnecessary detailed descriptions are omitted. For example, detailed descriptions of well-known matters or repetitive descriptions of essentially the same structures may be omitted. This is to avoid unnecessarily lengthy descriptions and to facilitate understanding by those skilled in the art. Furthermore, the accompanying drawings and the following description are provided to enable those skilled in the art to fully understand this application and are not intended to limit the subject matter of the claims.

[0032] Please see Figures 1-2 As shown in the embodiment of this utility model, a plastic particulate dust removal and drying device includes a processing chamber 1, a dust removal component 2, and a heating component 3. The processing chamber 1 has an inlet 11 and an outlet 12 at both ends, and a pushing mechanism 13 is provided inside the processing chamber 1. The dust removal component 2 includes an air inlet 21 and an air outlet 22 respectively located at both ends of the processing chamber 1. The heating component 3 is used to heat the processing chamber 1.

[0033] After crushing and washing, the raw plastic granules containing moisture are fed into the feed inlet 11 by the upstream conveyor and fall into the processing chamber 1. The pushing mechanism 13 begins to push the material axially along the processing chamber 1. The heating component 3 heats the processing chamber 1; the heating component 3 can directly heat the air or conduct heat through the bottom or wall. Heat enters the plastic granules through both conduction and convection, causing the internal and surface moisture of the plastic granules to rise in temperature and vaporize. The dust removal component 2 establishes a directional airflow between the air inlet 21 and the air outlet 22. The airflow passes over the surface of the material layer, generating shear stress, which carries dust, light particles, and water vapor from the surface and pores toward the air outlet 22. After sufficient heating and airflow treatment, the material is further pushed by the pushing mechanism 13 to the discharge outlet 12 and sent out to the downstream process.

[0034] The feeding mechanism 13 is a screw. The screw not only performs the conveying function, but also mixes, tumbles, and shears the material, separating the material particles, reducing agglomeration, and increasing the contact area with air and heat sources, which facilitates the evaporation of moisture and the release of dust from the surface and pores. Inside the processing chamber 1, the tumbling of the screw and the shearing of the airflow work together to ensure that the material is heated evenly, reduce local agglomeration or dead corners, and improve dust removal efficiency.

[0035] In one embodiment, multiple processing chambers 1 are connected in series and arranged vertically to form a series group. The vertically connected multi-stage processing chambers 1 break down a single large-volume processing chamber 1 into several ordered stages. The material enters each chamber from top to bottom, and is subjected to independent and controlled heating and airflow purging at each stage. The purpose is to extend the effective residence time, increase the heat and mass transfer efficiency, and improve the thoroughness of dust removal through staged and spectrum-based processing, while occupying less floor space.

[0036] Specifically, the crushed and washed material enters the first-stage processing chamber 1 through the upper feed inlet 11. Within each stage, the pushing mechanism 13 propels the material to the end of that stage and, driven by gravity, transfers it to the next stage's feed inlet. In each stage, independently controlled heating components 3 provide heat flux to the material, while a controlled airflow creates shear at each stage, carrying away dust and steam. The multi-stage process means the material undergoes multiple cycles of heating, airflow, and propulsion, removing some moisture and dust each time. The final chamber's output is then conveyed to subsequent processes.

[0037] Furthermore, multiple series-connected units are connected in parallel and arranged horizontally to form parallel groups. By arranging multiple vertically connected multi-stage drying and dust removal units in parallel horizontally, materials can be diverted upon entering the equipment, entering different series groups for independent processing. This avoids all materials concentrating in a single channel, reducing the load on individual groups. Each series group, as a relatively independent processing path, can operate simultaneously, achieving parallel processing. The number of parallel groups can be flexibly configured according to capacity requirements. If higher capacity is needed, only additional parallel series groups need to be added without changing the structure of individual groups, facilitating expansion and maintenance. The parallel structure reduces efficiency degradation or blockages caused by single-channel overload, improves the continuity and stability of material handling, and facilitates maintenance.

[0038] Furthermore, a suction pipe 4 is installed at the discharge collection port of the parallel group. The suction pipe 4 creates a negative pressure zone at the collection port, using airflow suction to draw the dust-removed and dried plastic granules or fragments from the discharge ports 12 of each parallel channel. The carrying effect of the airflow is equivalent to a pneumatic conveying system, which can directly send the material from the processing end to the downstream equipment. During the suction conveying process, the plastic granules remain dispersed, avoiding re-accumulation that could cause moisture reabsorption or dust adhesion, thus ensuring the durability of the dust removal and drying effect.

[0039] The dust removal assembly 2 also includes a filter 23, which is connected to the air outlet 22. The airflow at the air outlet 22 carries dust, fine particles, and water vapor released during material processing. The filter 23, located after the air outlet 22, traps dust particles in the airflow through a filter screen or filter element, ensuring only clean gas is discharged or returned, achieving gas-solid separation and providing a clean air foundation for subsequent airflow circulation and energy recovery. The filtered airflow can be returned to the processing chamber 1 as recirculated air, bringing in fresh hot air to contact the materials. The filter 23, in conjunction with the heating assembly 3, keeps the recirculated air warm, reducing the need for fresh air heating. The heat circulation system utilizes the returned filtered airflow to fully utilize waste heat, thereby reducing overall energy consumption.

[0040] Furthermore, filter 23 includes a dust collector filter 231 and a dehumidifier 232 connected sequentially to the air outlet 22. Dust and fine particles carried by the air outlet 22 first pass through the dust collector filter 231. The physical pore size of the filter is selected to suit the dust particle size, trapping most of the particles on the filter, significantly reducing the number of residual particles in the airflow, ensuring the cleanliness of the downstream airflow, and preventing dust from flowing back into the processing chamber 1 or entering the circulation system. The airflow treated by the filter still contains water vapor or high humidity air, and the dehumidifier 232 further reduces the humidity of the airflow. Dehumidification methods can include condensation, adsorption, or desiccants to dry the discharged airflow. The dry return air prevents moisture from being carried back to the processing chamber 1, ensuring that the materials are not re-moistened in subsequent processes.

[0041] The dust removal assembly 2 also includes a supplementary chamber 24 located between the inlet 11 and the outlet 12. The supplementary chamber 24 is located between the airflow circulation system and continuously provides additional heat to the airflow to compensate for the temperature drop caused by heat loss during the conveying process.

[0042] The heating assembly 3 includes a base 31 disposed at the bottom of the processing chamber 1 and an electromagnetic coil disposed inside the base 31. When the electromagnetic coil inside the base 31 is energized, it generates an alternating magnetic field, causing eddy currents to form on the metal plate of the base 31 and rapidly heating it up. The heat is conducted through the base 31 to the bottom of the processing chamber 1, where it comes into contact with the material or heats the air through convection, thereby achieving overall heating of the processing chamber 1.

[0043] The bottom of processing chamber 1 is composed of an arc-shaped plate. This arc-shaped bottom design avoids the pits and sharp corners of flat surfaces, preventing material accumulation or dead zones during screw propulsion and ensuring even material distribution at the bottom of processing chamber 1, thus improving contact efficiency with the heat source and airflow. Furthermore, the arc-shaped plate, in conjunction with the bottom electromagnetic heating mechanism, ensures more uniform bottom eddy currents and heat conduction. The arc-shaped plate reduces areas of excessively high or low temperatures, improving the overall temperature uniformity of processing chamber 1 and guaranteeing consistent heating of the material.

[0044] It should be noted that this application is not limited to the above-described embodiments. The above embodiments are merely examples, and any embodiments with the same structure and effect as the technical concept within the scope of this application are included in the technical scope of this application. Furthermore, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways of constructing by combining some of the constituent elements of the embodiments, without departing from the spirit of this application, are also included in the scope of this application.

Claims

1. A dust removal and drying device for plastic parts, characterized in that, include: The processing chamber (1) has an inlet (11) and an outlet (12) at its two ends respectively, and a pushing mechanism (13) is provided inside the processing chamber (1). The dust removal assembly (2) includes an air inlet (21) and an air outlet (22) respectively located at both ends of the processing chamber (1); Heating component (3), which is used to heat the treatment chamber (1).

2. The plastic sorting, dust removal, and drying equipment according to claim 1, characterized in that, Multiple processing chambers (1) are connected in series and arranged in sequence along the vertical direction to form a series group.

3. The plastic sorting, dust removal, and drying equipment according to claim 2, characterized in that, Multiple series groups are connected in parallel and arranged sequentially along the horizontal direction to form parallel groups.

4. The plastic sorting, dust removal, and drying equipment according to claim 3, characterized in that, A suction pipe (4) is provided at the discharge collection port of the parallel group.

5. The plastic sorting, dust removal, and drying equipment according to claim 1, characterized in that, The feeding mechanism (13) is a screw that is rotatably connected inside the processing chamber (1).

6. The plastic sorting, dust removal, and drying equipment according to claim 1, characterized in that, The dust removal assembly (2) also includes a filter (23) which is connected to the air outlet (22).

7. A plastic sorting, dust removal, and drying equipment according to claim 6, characterized in that, The filter (23) includes a dust removal filter (231) connected in sequence to the air outlet (22) and a dehumidifier (232).

8. A plastic sorting, dust removal, and drying equipment according to claim 1, characterized in that, The dust removal assembly (2) also includes a supplementary chamber (24) located between the feed inlet (11) and the discharge outlet (12).

9. A plastic sorting, dust removal, and drying equipment according to claim 1, characterized in that, The heating assembly (3) includes a base (31) disposed at the bottom of the processing chamber (1) and an electromagnetic coil disposed inside the base (31).

10. A plastic sorting, dust removal, and drying equipment according to claim 9, characterized in that, The bottom of the processing chamber (1) is formed by an arc-shaped plate.

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