A washing device for waste plastic shreds

Abstract

This invention discloses a cleaning device for waste plastic shreds, comprising a coarse washing tank and a fine washing tank. The coarse washing tank is an obliquely placed elongated tank with a mesh frame in the middle. Multiple semi-circular grooves are formed on the surface of the mesh frame, each containing a pushing auger. The fine washing tank is a vertical tank structure with a feed inlet at the top, connected to the discharge side of the coarse washing tank. A rotating cage is installed inside the fine washing tank, containing a brush holder with several rotating brushes. The rotating brushes are rod-shaped and their direction is perpendicular to the rotation axis of the rotating cage. The bottom of the rotating cage is openable, and the bottom of the fine washing tank has an openable discharge port. This cleaning device has a reasonable structure, is easy to operate, has high cleaning efficiency, and low resource consumption. It effectively solves the problems existing in the prior art and has high practical value and market application prospects.

Description

Technical Field

[0001] This invention relates to the field of waste plastic recycling technology, specifically to a washing device for crushed waste plastic materials. Background Technology

[0002] Plastic materials play an increasingly crucial role in modern society and production activities, and their applications have become extremely widespread. However, the resulting waste plastic pollution problem is also becoming increasingly serious, not only exacerbating environmental issues but also causing a significant waste of resources. Against this backdrop, the waste plastic recycling industry has developed rapidly. On the one hand, recycling waste plastics can reduce dependence on petroleum or bio-based raw materials, thereby achieving resource conservation benefits. On the other hand, compared to using petroleum to produce new plastics, using waste plastics to manufacture recycled plastics can reduce energy consumption and carbon dioxide emissions, thus bringing significant environmental benefits.

[0003] In the recycling industry of waste plastics, the first step is to crush and clean the recycled plastic structural parts. Crushing breaks down large pieces of plastic into smaller fragments, which not only facilitates subsequent processing and sorting but also separates other structural materials attached to the plastic parts. This makes it easier to remove labels, glue, oil stains, and other material impurities from the crushed plastic fragments during the cleaning process. The cleaning process further ensures the cleanliness of the plastic fragments. If they are not thoroughly cleaned, the residue may reduce the performance of the plastic during the recycling process or even produce harmful substances, affecting the safety and reliability of the final product.

[0004] Currently, existing machinery for cleaning waste plastic fragments has several shortcomings. Some cleaning equipment has an overly complex design, resulting in bulky equipment and significantly increased costs during use and maintenance. Secondly, some cleaning equipment is inefficient, failing to thoroughly remove all impurities from the plastic fragments, directly impacting the quality of the cleaned fragments. Furthermore, some cleaning equipment consumes large amounts of water and energy during operation. This high consumption not only increases operating costs but also contradicts current environmental protection principles and is detrimental to sustainable development.

[0005] In view of this, the present invention proposes a novel waste plastic pretreatment device, which aims to solve the problems existing in the prior art, improve cleaning efficiency, and reduce resource consumption. Summary of the Invention

[0006] The technical problem solved by the present invention is to provide a washing device for waste plastic crushed material, which can be used to overcome the defects in the above-mentioned technical background.

[0007] The technical problem solved by this invention is achieved by the following technical solution:

[0008] A washing device for waste plastic shreds includes a coarse washing tank and a fine washing tank;

[0009] The coarse washing tank is an obliquely placed elongated tank body, with the feed side located at the bottom and the discharge side located at the top. A mesh frame is set in the middle of the coarse washing tank body. The surface of the mesh frame is formed with multiple parallel semi-circular arc-shaped grooves. The grooves are set along the length of the coarse washing tank. Each groove is equipped with a pusher auger that matches the groove. The rotation direction of the pusher auger is based on pushing the material in the coarse washing tank from the feed side to the discharge side.

[0010] The fine washing tank has a vertical tank structure. The top of the tank is equipped with a feed inlet connected to the discharge side of the coarse washing tank to receive material from it. A rotating drum is installed inside the tank, and a brush holder is installed inside the drum. The brush holder has a stirring frame structure and is equipped with several rotating brushes. The rotation direction of the brush holder is opposite to that of the rotating drum. The rotating brushes are rod-shaped brushes, positioned perpendicular to the axis of rotation of the drum, and rotate synchronously with the drum. The bottom of the rotating drum is an openable structure, and the bottom of the fine washing tank is equipped with an openable discharge port seat.

[0011] As a further limitation, the cleaning device is connected to an alkaline soaking and decomposition tank in front of the coarse washing tank.

[0012] As a further limitation, both the body of the coarse washing tank and the body of the fine washing tank are made of stainless steel to ensure that the entire cleaning device has good corrosion resistance and a long service life.

[0013] As a further limitation, the bottom of the coarse washing tank is also equipped with an ultrasonic generator. The ultrasonic waves generated by the ultrasonic generator can penetrate into the tiny gaps of the material, effectively removing stubborn stains and oil stains attached to the surface of the plastic fragments.

[0014] As a further limitation, the cleaning device is connected to the drying assembly at the rear of the fine washing tank, and the drying assembly is a combination of a perforated conveyor belt and a tunnel drying device.

[0015] As a further limitation, the mesh frame includes a structural frame, and the rough washing tank has a placement protrusion formed on the side wall at the middle position of the tank body, which matches the size of the structural frame. Through the placement protrusion, the mesh frame can be stably installed in the rough washing tank.

[0016] The structural frame has mounting brackets formed between adjacent lower grooves. The independently formed mesh lower grooves have lugs on both sides that match the size of the mounting brackets. Through the cooperation of the mounting brackets and the lugs, the mesh lower grooves can be quickly installed and removed from the mesh frame, which facilitates cleaning and maintenance.

[0017] As a further limitation, the lower part of the fine washing tank is equipped with an aeration device, and the upper part is equipped with a cleaning liquid replenishment pipeline. The cleaning liquid replenishment pipeline is a spray pipeline, which is used to add cleaning liquid during the fine washing cycle and to spray cleaning liquid evenly when the drum rotates, so as to ensure that each piece of waste plastic is thoroughly cleaned.

[0018] As a further limitation, the coarse washing tank and / or fine washing tank are also equipped with a heating device, which can heat the washing water to improve the washing efficiency and effect; the heating device can be an electric heater, a steam heater or other type of heating equipment to ensure that the water temperature is kept within a suitable range during the washing process, so as to better remove stubborn stains such as oil and glue from the plastic fragments.

[0019] As a further limitation, a valve plate is provided at the discharge hole seat position, and the opening and closing of the discharge hole seat is controlled by the valve plate, thereby realizing the automatic discharge of the cleaned plastic fragments.

[0020] As a further limitation, the cleaning device also includes a cleaning fluid circulation system with a filter, which is located at the bottom of the fine cleaning tank to receive the cleaning fluid generated during the fine cleaning process and to filter and purify the cleaning fluid through the filter. The filtered cleaning fluid is continuously recycled by a circulation pump, thereby saving resources and reducing wastewater discharge. The filter is a combination of a sand filter, an activated carbon filter and a precision filter.

[0021] Beneficial Effects: The present invention provides a simple cleaning device for waste plastic fragments, facilitating daily maintenance and cleaning, and effectively reducing long-term operating costs. The device effectively removes most impurities and stains through the initial cleaning in the coarse washing tank, laying a solid foundation for the subsequent fine washing steps. The auger in the coarse washing tank efficiently transports the material from the inlet to the outlet, ensuring the continuity and efficiency of the cleaning process. Furthermore, the rotating drum and brush design in the fine washing tank achieves comprehensive cleaning of the plastic fragments, ensuring cleanliness of every part. The synchronous rotation of the drum and brush not only improves cleaning efficiency but also reduces potential damage to the plastic fragments. Attached Figure Description

[0022] Figure 1 This is an assembly diagram of a preferred embodiment of the present invention.

[0023] Figure 2 for Figure 1Schematic diagram of the longitudinal section of the coarse washing tank.

[0024] Figure 3 for Figure 1 Schematic diagram of the internal structure of the intermediate washing tank.

[0025] The components include: 1. Coarse washing tank; 2. Fine washing tank; 3. Perforated conveyor belt; 4. Tunnel drying device; 5. Discharge hole seat; 6. Valve plate switch; 7. Tank body; 8. Pushing auger; 9. Mounting frame; 10. Auger drive shaft; 11. Groove under the mesh surface; 12. Storage protrusion; 13. Top cover; 14. Feed inlet; 15. Tank cover; 16. Gearbox; 17. Spray head; 18. Cleaning fluid replenishment pipeline; 19. Liquid supply port; 20. Stirring shaft; 21. Brush holder; 22. Rotating cage; 23. Rotating brush; 24. Lifting seat. Detailed Implementation

[0026] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below with reference to specific illustrations.

[0027] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0028] In the following embodiments, those skilled in the art will understand that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have a meaning consistent with their meaning in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless defined as herein.

[0029] See Figures 1-3 A washing device for waste plastic shreds is disclosed in this embodiment. In the recycling and reprocessing of waste plastics, it is used to wash the shredded waste plastic material. A blade crusher is used to crush the waste plastic, which efficiently cuts plastic products into shreds using high-speed rotating blades. This crusher exhibits excellent adaptability to different types and hardnesses of plastic products, and effectively removes non-plastic impurities adhering to the plastic products during the crushing process.

[0030] Before entering the washing unit, the corresponding waste plastic fragments need to undergo alkaline immersion in an alkaline disintegration tank. The purpose of alkaline disintegration is to soak the plastic fragments in an alkaline solution to soften and remove surface oil, glue, and other organic impurities. The concentration of the alkaline solution and the soaking time in the alkaline disintegration tank are adjusted according to the type and degree of contamination of the plastic fragments to ensure optimal disintegration results. The alkaline-disintegrated plastic fragments are then sent to the washing unit.

[0031] The cleaning device includes a coarse washing tank 1 and a fine washing tank 2 connected in sequence. The coarse washing tank 1 has a long strip-shaped tank structure. The tank body 7 is made of stainless steel to take into account both corrosion resistance and performance. The tank body 7 is supported at the bottom by a bracket. The feed side of the inclined coarse washing tank 1 is located at the bottom, while the discharge side is located at the top.

[0032] The coarse washing tank 1 is connected to the upper and lower parts of the discharge side by circulating water channels. The material in the coarse washing tank 1 is rinsed with fresh water by the circulating water flowing from the upper part into the coarse washing tank 1. The rinsing water flowing out from the lower part is returned and filtered before re-entering the circulation to reduce the waste of water resources.

[0033] On both sides of the middle position of the coarse washing tank 1, there are protrusions 12 for placing items. At the same time, two sets of mounting rods 9 are fixedly installed between the protrusions 12 on both sides. The protrusions 12 on both sides and the mounting rods 9, as well as the two sets of mounting rods 9, are equally spaced for mounting the mesh surface grooves 11. The mesh surface grooves 11 have a structural frame and are mounted on the corresponding protrusions 12 or mounting rods 9 on both sides through the structural frame, and are structurally fixed by threaded fasteners. These mesh under-grooves 11 are arranged along the length of the coarse washing tank 1. Each mesh under-grooves 11 is equipped with a matching push auger 8. The auger drive shaft 10 of the push auger 8 is externally connected and can be driven to rotate. The rotation direction of the push auger 8 is designed to push the material in the coarse washing tank 1 from the feed side to the discharge side, so as to ensure that the material is continuously washed in the coarse washing tank 1 in conjunction with the flowing rinsing water. During the rinsing process, the impurities washed off are pushed and agitated by the push auger 8 to leak down through the mesh under-grooves 11 to the bottom of the tank body 7 and discharged with the rinsing water.

[0034] In order to further improve the coarse washing effect of the coarse washing tank 1, an ultrasonic generator is also installed at the bottom of the coarse washing tank 1. This generator can generate ultrasonic waves that penetrate into the tiny gaps of the material and effectively remove stubborn stains and oil stains attached to the surface of the plastic fragments.

[0035] The fine washing tank 2 has a vertical tank structure with an open top surface, which is sealed by a tank cover 15. The tank cover 15 is equipped with a feed inlet 14, which is connected to the discharge side of the coarse washing tank 1 on one side to receive material from the coarse washing tank. At the same time, the top of the feed inlet 14 also has an independent top opening, which can also be used for material discharge. When not discharging material, the top opening is closed by a top cover 13.

[0036] The washing tank 2 is made of stainless steel to ensure corrosion resistance and strength. Inside the washing tank 2, there is a rotating drum 22, and a brush holder 21 is installed inside the rotating drum 22. The brush holder 21 is a stirring frame structure, on which several rotating brushes 23 are installed. The stirring shafts 20 of the rotating drum 22 and the brush holder 21 are assembled on two different output ends of the same gearbox 16. The corresponding gearbox 16 is connected to an external drive motor, which, under the drive of the drive motor, makes the rotating brushes 23 rotate in the opposite direction to the rotating drum 22, so as to ensure that the plastic fragments are cleaned from all angles.

[0037] In this embodiment, the rotating drum 22 is also formed with multiple rotating brushes 23. These rotating brushes 23 are rod-shaped brushes, assembled onto the brush holder 21 via connecting rods, and can be replaced or adjusted according to different cleaning needs. The rotating brushes 23 are made of a wear-resistant material that is friendly to the surface of plastic fragments to reduce damage to the plastic fragments. The structural design of the brush holder 21 allows the rotating brushes 23 to rotate freely within the rotating drum 22 while maintaining full contact with the plastic fragments to achieve the best cleaning effect; and the rotating brushes 23 can be set to rotate actively or passively as needed.

[0038] Furthermore, the rotation speed of the rotating drum 22 can be adjusted via the gearbox 16 to accommodate different types and sizes of plastic fragments. The gearbox 16 is connected to a drive motor; by controlling the motor's speed, the rotation speed of the rotating drum 22 and the rotating brush 23 can be precisely controlled, thus achieving gentle yet effective cleaning of the plastic fragments. This design not only improves cleaning efficiency but also extends the equipment's lifespan.

[0039] To ensure cleaning effectiveness, the bottom of the fine washing tank 2 is equipped with an aeration device, and the top is equipped with a spray system. The spray system consists of multiple spray heads 17 and a cleaning fluid replenishment pipeline 18. The cleaning fluid replenishment pipeline 18 is connected to the cleaning fluid supply device through the liquid supply port 19 on the tank wall of the fine washing tank 2. The spray heads 17 spray high-pressure jets to add cleaning fluid during the fine washing cycle and to evenly spray cleaning fluid when the rotating drum 22 rotates, ensuring that each piece of waste plastic is thoroughly cleaned.

[0040] In another embodiment, a heating device may also be installed in the coarse washing tank 1 and / or the fine washing tank 2 to heat the washing water, thereby improving cleaning efficiency and effectiveness. The heating device may be an electric heater, a steam heater, or other type of heating equipment to ensure that the water temperature is maintained within a suitable range during the cleaning process, thereby better removing stubborn stains such as oil and glue from the plastic fragments.

[0041] The bottom of the rotating drum 22 is an independently formed cage bottom, which is connected to the main body of the rotating drum 22 via a lifting seat 24. By controlling the lifting seat 24 to rise and fall, the cage bottom can be separated from the main body of the rotating drum 22. After separation, the rotating drum 22 rotates to discharge the cleaned plastic fragments. Correspondingly, a discharge port seat 5 is also provided at the bottom of the fine washing tank 2. The discharge port seat 5 cooperates with the cage bottom of the rotating drum 22 to ensure that the cleaned plastic fragments can be smoothly discharged from the fine washing tank 2. The discharge port seat 5 is designed with an adjustable valve, which is controlled by a valve plate switch 6. The discharge speed and flow rate can be adjusted according to the actual needs of the cleaning process, thereby optimizing the cleaning efficiency.

[0042] The cleaning device also includes a cleaning solution circulation system with a filter, located at the bottom of the fine washing tank 2. This system collects the cleaning solution generated during the fine washing process and filters and purifies it. The filtered cleaning solution is continuously recycled using a circulation pump, thereby saving resources and reducing wastewater discharge. The filtration device is a combination of a sand filter, an activated carbon filter, and a precision filter to ensure the cleanliness of the cleaning solution.

[0043] The washing device also includes a drying component at the discharge port seat 5 of the washing tank 2 for drying the washed plastic fragments. The drying system consists of a combination of a perforated conveyor belt 3 and a tunnel drying device 4. After being drained on the perforated conveyor belt 3, the washed plastic fragments are conveyed to the tunnel drying device 4 for drying to remove moisture from the surface of the plastic fragments, ensuring the dryness and cleanliness of the final product.

[0044] In summary, the cleaning device provided by this invention achieves efficient cleaning of waste plastic fragments through the combination of a coarse washing tank 1 and a fine washing tank 2. The preliminary cleaning in the coarse washing tank 1 removes most impurities and stains, laying the foundation for the subsequent fine washing steps. The rotating cage 22 and rotating brush 23 in the fine washing tank 2 enable all-round cleaning of the plastic fragments, ensuring cleanliness of every part. The use of an ultrasonic generator and heating device further improves the cleaning effect, while the setting of the cleaning fluid circulation system and drying components ensures resource conservation and the quality of the final product. Overall, the cleaning device of this invention has a simple structure, is easy to maintain, can effectively reduce long-term operating costs, and has good cleaning efficiency and environmental benefits.

[0045] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A washing device for waste plastic shreds, characterized in that, This includes a pre-wash tank and a fine wash tank connected in sequence; The coarse washing tank is an obliquely placed, elongated tank body, with the feed side at the bottom and the discharge side at the top. There are two placement protrusions on both sides of the middle of the tank body, and two sets of mounting brackets are fixed between these protrusions. Equally spaced grooves for mounting the mesh surface are provided between the placement protrusions and the mounting brackets, as well as between the two sets of mounting brackets. Each groove has a structural frame, which is used to mount the corresponding placement protrusion or mounting bracket on both sides, and is structurally fixed by threaded fasteners. The grooves extend along the length of the coarse washing tank. A matching auger is installed at each groove position. The auger's drive shaft is externally connected and can be driven to rotate. The rotation direction of the auger is designed to push the material in the coarse washing tank from the feed side to the discharge side. The coarse washing tank is connected to the circulating water circuit at the upper and lower parts corresponding to the discharge side. The material in the coarse washing tank is rinsed with fresh water by the circulating water flowing from the upper part into the coarse washing tank, while the rinsing water flowing out from the lower part is returned and filtered before re-entering the circulation. An ultrasonic generator is also installed at the bottom of the coarse washing tank; The fine washing tank has a vertical structure with an inlet at the top that connects to the discharge side of the coarse washing tank to receive material from it. Inside the tank is a rotating drum containing a brush holder, which is a stirring frame structure with several rotating brushes. The brush holder rotates in the opposite direction to the drum. The rotating brushes are rod-shaped, perpendicular to the drum's axis of rotation, and rotate synchronously with the drum. The bottom of the drum is openable, and the bottom of the fine washing tank has an openable discharge port. The bottom of the drum is an independently formed cage bottom, connected to the main body of the drum via a lifting seat. By controlling the lifting seat, the cage bottom can be separated from the main body of the drum. After separation, the washed plastic fragments are discharged by rotating the drum. The lower part of the fine washing tank is equipped with an aeration device, and the upper part is equipped with a cleaning liquid replenishment pipeline, which is a spray pipeline; the rear part of the fine washing tank is connected to a drying component, which is a combination of a perforated conveyor belt and a tunnel drying device. The coarse washing tank and / or fine washing tank are also equipped with a heating device, which is an electric heater or a steam heater; The cleaning device also includes a cleaning fluid circulation system with a filter. The cleaning fluid circulation system is located at the bottom of the fine cleaning tank and is used to receive the cleaning fluid generated during the fine cleaning process. The cleaning fluid is then filtered and purified by the filter.

2. The washing device for waste plastic shredded material according to claim 1, characterized in that, Both the coarse washing tank and the fine washing tank are made of stainless steel.

3. The washing device for waste plastic shredded material according to claim 1, characterized in that, A valve plate is provided at the discharge hole seat position, and the opening and closing of the discharge hole seat is controlled by the valve plate, thereby realizing the automatic discharge of the cleaned plastic fragments.

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