Plastic electrostatic sorting device and sorting method

Abstract

The invention relates to the technical field of plastic sorting, and provides a plastic electrostatic sorting device and method.The plastic electrostatic sorting device comprises an equipment rack, a feeding barrel, a dehumidification feeding assembly and a circulating air supply assembly, the top of the equipment rack is fixedly provided with a feeding hopper and a discharging hopper, the feeding barrel is fixedly installed at the top of the equipment rack, and the dehumidification feeding assembly is fixedly installed at the top of the equipment rack; the discharging end of the feeding hopper and the feeding end of the discharging hopper are communicated with the two ends of the feeding barrel respectively, a hollow layer is arranged in the feeding barrel, a plurality of air suction holes are formed in the feeding barrel in a circumferential shape at equal angles, the dehumidification feeding assembly is installed in the feeding barrel, and the circulating air supply assembly is installed on an equipment rack. The technical problems that in the prior art, when plastic which easily absorbs water is sorted, due to improper control over the drying temperature or non-uniform drying before sorting, part of plastic sheets are likely to be caked or adhered due to high local humidity, electrostatic characteristics are changed, and electrostatic sorting is affected are solved.

Description

Technical Field

[0001] The embodiments of the present disclosure relate to the technical field of plastic sorting, and in particular, to a plastic electrostatic sorting device and a sorting method. Background Art

[0002] Plastic electrostatic separator is a device that uses electrostatic field to separate charged particles. It is widely used in the recycling and reuse of waste plastics. Its working principle is based on the different charged properties of plastic materials in the electrostatic field, and different types of plastics are separated by electrostatic force.

[0003] In the existing electrostatic sorting process, the plastic material is first charged by friction or contact to obtain different electrostatic charges. When the charged plastic material enters the sorting machine, it passes through a strong electrostatic field. Plastic materials with different charging degrees and charges are subjected to different electrostatic forces in the electrostatic field, thereby producing different movement trajectories. These differences separate different types of plastics. Finally, plastic particles with different trajectories are collected in different containers, thereby achieving effective separation of plastics.

[0004] When sorting plastic sheets of different materials, the plastic sheets are generally cleaned before sorting. When sorting some materials such as PET and PA that are easy to absorb moisture on the surface, if the waste water is not completely dried or drained, and if the storage environment is too humid, it is also easy to cause the plastic sheets to become damp, thereby affecting the sorting process. Therefore, the plastic sheets need to be dried before sorting to reduce the problem of charging failure caused by residual moisture on the plastic sheets, thereby reducing the sorting accuracy. However, during the drying process, if the drying temperature is not properly controlled, the physical or chemical properties of the plastic will be destroyed, causing the plastic sheets to soften and deform, causing the electrostatic properties to change, and resulting in uneven drying, so that some plastic sheets may clump or stick together due to high local humidity, thereby affecting the electrostatic sorting process. Summary of the invention

[0005] In order to overcome the above-mentioned defects, the embodiments of the present disclosure provide a plastic electrostatic sorting device and a sorting method, which solves the technical problem in the prior art that when sorting plastics that are easy to absorb moisture, due to improper control of the drying temperature before sorting or uneven drying, some plastic sheets may agglomerate or stick together due to high local humidity, causing the electrostatic properties to change, thereby affecting the electrostatic sorting.

[0006] The technical solution of the present disclosure is as follows: A plastic electrostatic sorting device comprises an equipment frame, a feed hopper and a discharge hopper are respectively fixedly mounted on the top of the equipment frame, the feed hopper and the discharge hopper are respectively arranged on both sides of the top of the equipment frame, and further comprises: A feeding barrel, the feeding barrel is fixedly mounted on the top of the equipment frame, the discharge end of the feeding hopper and the feeding end of the discharge hopper are respectively connected to the two ends of the feeding barrel, a hollow layer is arranged inside the feeding barrel, a plurality of suction holes are opened at equal angles in a circular shape inside the feeding barrel, and each of the suction holes is connected to the hollow layer; A dehumidification feeding assembly, which is installed inside the feeding barrel and is used to feed the plastic sheets fed into the feeding barrel through the feeding hopper into the discharging hopper, and simultaneously dehumidify the wet plastic sheets and clean impurities; A circulating air supply component is installed on the equipment rack and is used to supply air to the dehumidification feeding component during the dehumidification process.

[0007] On the basis of the above scheme, the dehumidification feeding assembly includes a first drive motor, the first drive motor is fixedly mounted on the equipment frame, and further includes: A driving shaft, the driving shaft is coaxially rotatably mounted inside the feeding barrel, one end of the driving shaft is fixedly connected to the output end of the first driving motor through a first transmission mechanism; Wherein, the interior of the driving shaft is configured as a hollow structure; A spiral conveying plate, wherein the spiral conveying plate is fixedly mounted on the driving shaft, and a gap is left between the spiral conveying plate and the inner wall of the feeding barrel; An exhaust part, which is mounted on the driving shaft and is used to dry the plastic sheet by conveying high-temperature air into the feeding cylinder; A heat transfer part is installed on the feeding barrel and is used to heat the air entering the feeding barrel.

[0008] On the basis of the above scheme, the exhaust part comprises: A cleaning feeding brush, which is fixedly mounted on the spiral conveying plate and abuts against the inner wall of the feeding tube; The jet belt is spirally arranged on the driving shaft, the spirally arranged jet belt and the spiral conveying plate are staggered with each other, the jet belt is composed of a plurality of jet heads, and the plurality of jet heads are connected to the driving shaft.

[0009] On the basis of the above solution, the heat transfer part includes a heater and further includes: A heat-conducting frame is coaxially and fixedly mounted on an end of the feeding barrel away from the first driving motor, one end of the heat-conducting frame is coaxially and rotationally connected to the driving shaft, the heater is fixedly mounted on the heat-conducting frame, and a cavity is arranged inside the heat-conducting frame.

[0010] In addition to the above solutions, it also includes: A heating wire, the heating wire is spirally fixedly installed in the cavity inside the heat-conducting frame, and the heating wire is connected to the output end of the heater; A plurality of heat-conducting sheets are fixedly installed at equal angles in a circular shape inside the heat-conducting frame, and the heat-conducting sheets are fixedly connected to the heating wire.

[0011] Based on the above solution, the circulating air supply component includes: A blower, wherein the blower is fixedly mounted on the equipment frame, and an output end of the blower is connected to an end of the heat-conducting frame away from the driving shaft; A filter return air unit is installed on the blower and is used to extract and filter the air entering the feeding tube, and then re-enter the feeding tube.

[0012] On the basis of the above scheme, the filter return air unit includes a dust collector, which is arranged on the side of the equipment rack, and further includes: A suction pipe, one end of which is connected to the dust collector input end, and the other end of which is connected to the hollow layer of the feeding cylinder; A return air duct is connected between an output end of the dust collector and an output end of the blower.

[0013] On the basis of the above scheme, it also includes an electrostatic sorting component, the electrostatic sorting component is installed inside the equipment frame, the electrostatic sorting component is connected to the discharge end of the discharge hopper, and is used to sort plastic sheets, the electrostatic sorting component includes a vibrating feeder, the vibrating feeder is installed inside the equipment frame, and further includes: A uniform feeding hopper, the uniform feeding hopper is fixedly installed inside the equipment frame, the feeding end of the uniform feeding hopper is connected with the discharging end of the discharge hopper, and the discharging end of the uniform feeding hopper is located on the upper part of the vibrating feeding frame; A lower hopper, the lower hopper is fixedly mounted inside the equipment frame, and a feeding end of the lower hopper is located at a discharging end of the vibrating feeder frame; The sorting part is installed inside the equipment frame and is used to sort plastic sheets of different materials.

[0014] On the basis of the above solution, the sorting part includes a second drive motor, the second drive motor is fixedly mounted on the equipment frame, and further includes: A sorting drum, which is rotatably mounted inside the equipment frame, is located at the bottom of the discharge end of the lower hopper, and one end of the sorting drum is fixedly connected to the output end of the second drive motor through a second transmission mechanism; A corona electrode, wherein the corona electrode is fixedly installed inside the equipment frame and arranged in parallel with the sorting drum; A collecting hopper is fixedly installed inside the equipment frame, and a multi-level slot design is adopted in the collecting hopper to collect plastic materials by type.

[0015] A plastic electrostatic separation method, using the above-mentioned plastic electrostatic separation device, comprises the following steps: The first step is feeding, feeding wet plastic sheets of different materials into the feed hopper respectively; The second step is feeding. After the plastic sheet enters the feeding cylinder, the first drive motor drives the spiral conveying plate to rotate through the drive shaft, and the plastic sheet is gradually pushed to the discharge hopper through the cooperation of the feeding brush. The third step is air supply, where air is supplied to the inside of the drive shaft under the action of the blower; The fourth step is to heat the air. The heater makes the heating wire generate heat through the electric current, and the generated heat is evenly transferred to the heat conducting sheet. When the air flows through multiple heat conducting sheets, the air entering the drive shaft is heated. The fifth step is drying. Through the setting of the jet head, the airflow, the spiral conveyor plate and the rotation of the cleaning feed brush work together to make the wet plastic sheets evenly turn over in the feed barrel, thereby drying; The sixth step is the air impurity removal cycle. The high-temperature air entering the feeding barrel will pass through the suction hole. The air mixed with impurities will be sucked into the dust collector through the hollow layer and the suction pipe under the action of the suction pipe. After being filtered by the dust collector, the return air pipe will send the filtered clean air back to the blower to form a cycle. The seventh step is unloading. With the cooperation of the cleaning feeding brush and the spiral conveyor plate, the plastic sheets are discharged from the discharge hopper into the uniform feeding hopper and evenly fall onto the vibrating feeding rack. After the shaking action of the vibrating feeding rack, the plastic sheets are evenly discharged during transportation and enter the unloading hopper, and then enter the sorting area through the unloading hopper. The eighth step is sorting. The second driving motor is used to drive the sorting drum to rotate. Corona discharge is generated by applying high voltage to the corona electrode. The sorting drum serves as the grounding electrode of the sorting system and forms a closed electric field with the corona electrode. The plastic sheets are charged by contact with the ionized gas in the electric field. The charged plastic sheets are adsorbed to the surface of the sorting drum or detached from the sorting drum under the action of the electric field force. According to the positive and negative polarity of static electricity, the plastic sheets will fall into the collection hoppers of the corresponding levels, thereby realizing the sorting of different types of plastic sheets.

[0016] The beneficial effects of the embodiments of the present disclosure are: 1. In the present invention, by arranging the hollow layer of the driving shaft, the nozzle and the spiral conveying plate, the hot air conveying and material pushing functions are integrated into the same shaft system, thereby reducing the space occupancy rate. Moreover, by adjusting the flow rate of the nozzle, the nozzle can be controlled to spray an airflow with suitable pressure into the feeding barrel, thereby improving the drying effect, so that the wet plastic sheets can be dried quickly and evenly, and the material tumbling and hot air penetration can be achieved. At the same time, the air intake holes are cleaned to prevent impurities on the plastic sheets from clogging the air intake holes when being discharged, thereby ensuring the smoothness and efficiency of the entire drying and dehumidification process.

[0017] 2. In the present disclosure, the heating wire generates heat through electric current, and the generated heat is evenly transferred to the heat conductive sheet, thereby heating the air passing through the heat conductive sheet, so that the air entering the driving shaft is heated, and the air temperature at the end of the feeding barrel close to the heat conductive sheet is higher than that at the end far from the heat conductive sheet, thereby improving the drying efficiency, quickly removing moisture from the plastic sheet, achieving an ideal drying effect, and ensuring that the drying process is safer.

[0018] 3. In the present invention, through the setting of the dehumidification feeding component, the plastic sheets are dried while feeding, and the degree of drying can be adjusted according to the degree of dehydration of the plastic sheets. The whole drying process is more uniform, and under the action of the exhaust part, the air circulation is not affected, thereby reducing the occurrence of agglomeration in the undried parts of the plastic sheets during the drying process, facilitating the smooth progress of electrostatic sorting, and under the action of the circulating air supply component, reducing the impact of impurities brought out during drying on the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the description of the embodiments of the present disclosure. Obviously, the drawings described below are only some exemplary embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can be obtained based on the contents of the exemplary embodiments of the present disclosure and these drawings without creative work.

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of a three-dimensional structure in cross section in the present invention; Figure 3 It is a schematic diagram of the three-dimensional structure of the present invention viewed from another angle; Figure 4 It is a cross-sectional structural schematic diagram of the cooperation between the dehumidification feeding assembly and the blower in the present invention; Figure 5 It is a cross-sectional structural schematic diagram of the exhaust part and the heat transfer part in the present invention; Figure 6 It is a schematic diagram of the cross-sectional structure of the electrostatic separation part in the present invention.

[0021] In the figure: 1. Equipment frame; 2. Feed hopper; 3. Discharge hopper; 4. Feeding barrel; 5. Air suction hole; 6. First drive motor; 7. Drive shaft; 8. First transmission mechanism; 9. Screw conveyor plate; 10. Cleaning feeding brush; 11. Injection nozzle; 12. Heater; 13. Heat transfer frame; 14. Heating wire; 15. Heat transfer sheet; 16. Blower; 17. Dust collector; 18. Suction pipe; 19. Return air pipe; 20. Vibrating feeding frame; 21. Uniform feeding hopper; 22. Lower hopper; 23. Second drive motor; 24. Sorting roller; 25. Second transmission mechanism; 26. Corona electrode; 27. Collecting hopper. DETAILED DESCRIPTION

[0022] The present disclosure is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present disclosure, rather than to limit the present disclosure.

[0023] In order to simplify the drawings, only the parts related to the disclosure are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically shown, or only one of them is marked. In this article, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0024] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this disclosure can be understood according to specific circumstances.

[0025] In the present disclosure, unless otherwise expressly specified and limited, a first feature being “above” or “below” a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being “above”, “above”, and “above” a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0026] In the description of this embodiment, terms such as "up", "down", "left", and "right" and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present disclosure.

[0027] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0028] Embodiment 1, as Figures 1 to 6 As shown, it shows a plastic electrostatic sorting device in an embodiment of the present disclosure, including an equipment frame 1, a feed hopper 2 and a discharge hopper 3 are fixedly installed on the top of the equipment frame 1, and the feed hopper 2 and the discharge hopper 3 are respectively arranged on both sides of the top of the equipment frame 1, and also include a feeding barrel 4, a dehumidification feeding component and a circulating air supply component. The feeding barrel 4 is fixedly installed on the top of the equipment frame 1, and the discharge end of the feed hopper 2 and the feeding end of the discharge hopper 3 are respectively connected with the two ends of the feeding barrel 4, and a hollow layer is arranged inside the feeding barrel 4, and a plurality of suction holes 5 are opened at equal angles in a circular shape inside the feeding barrel 4, and each suction hole 5 is connected with the hollow layer, and the dehumidification feeding component is installed inside the feeding barrel 4, and is used to feed the plastic sheets fed into the feeding barrel 4 through the feed hopper 2 into the discharge hopper 3, and synchronously The dehumidification and feeding assembly is used to dehumidify and clean impurities from wet plastic sheets. The dehumidification feeding assembly includes a first driving motor 6, which is fixedly mounted on the equipment frame 1, and also includes a driving shaft 7, a spiral conveying plate 9, an exhaust portion and a heat transfer portion. The driving shaft 7 is coaxially mounted inside the feeding barrel 4, and one end of the driving shaft 7 is fixedly connected to the output end of the first driving motor 6 through a first transmission mechanism 8, wherein the interior of the driving shaft 7 is configured as a hollow structure, the spiral conveying plate 9 is fixedly mounted on the driving shaft 7, and a gap is left between the spiral conveying plate 9 and the inner wall of the feeding barrel 4. The exhaust portion is mounted on the driving shaft 7, and is used to dry the plastic sheets by conveying high-temperature air into the feeding barrel 4. The heat transfer portion is mounted on the feeding barrel 4, and is used to heat the air entering the feeding barrel 4.

[0029] It should be added that the first transmission mechanism 8 adopts a belt drive method. The end of the driving shaft 7 and the output end of the first driving motor 6 are both connected with pulleys. The two pulleys are connected by a transmission belt tensioning connection. At the same time, a tensioning device is provided to maintain appropriate tension to ensure stable and efficient transmission.

[0030] Specifically, when sorting plastic sheets of different materials, it is necessary to feed the plastic sheets of different materials into the feed hopper 2 respectively, and adjust the parameters of the dehumidification feeding component at the same time. When the plastic sheets enter the feeding barrel 4, the first driving motor 6 is started, and the first driving motor 6 drives the driving shaft 7 to rotate through the first transmission mechanism 8. The driving shaft 7 drives the spiral conveying plate 9 to rotate, and the plastic sheets are gradually pushed to the discharge hopper 3. At this time, relative rotation occurs between the driving shaft 7 and the heat conduction frame 13. At the same time, the heat transfer part and the exhaust part are opened, and air is fed into the driving shaft 7 through the circulating air supply component. In this process, the air is heated by the heat transfer part, and the maximum temperature is not higher than 100°C. Then, the high-temperature air entering the driving shaft 7 is evenly discharged into the feeding barrel 4 through the exhaust part to dry the plastic sheets. At the same time, the exhaust The flow rate of the part is adjustable, so as to control the discharge flow rate of high-temperature air, ensuring that each material of plastic sheets is properly dehumidified and cleaned in the feeding barrel 4. After the high-temperature air entering the feeding barrel 4 dehumidifies and cleans the plastic sheets, these air are mixed with moisture and impurities, enter the hollow layer through the air suction hole 5, and return to the circulating air supply component through the hollow layer, and are reused after purification, which not only improves efficiency but also saves energy and is environmentally friendly. At the same time, the design of the hollow layer effectively isolates the hot air from the external environment, avoids heat loss, and further improves the dehumidification efficiency. The surface of the treated plastic sheet is dry and clean, and finally, with the cooperation of the exhaust part and the spiral conveyor plate 9, it is discharged into the electrostatic sorting component by the discharge hopper 3 to accurately sort the plastic sheets, ensuring that each material of plastic sheets is effectively separated, thereby improving the sorting efficiency and quality.

[0031] The above, such as Figures 3 to 5 As shown, the exhaust part includes a cleaning feeding brush 10 and a jet belt. The cleaning feeding brush 10 is fixedly mounted on the spiral conveying plate 9, and the cleaning feeding brush 10 abuts against the inner wall of the feeding tube 4. A jet belt is spirally arranged on the driving shaft 7. The spirally arranged jet belt and the spiral conveying plate 9 are staggered with each other. The jet belt is composed of a plurality of jet heads 11, and the plurality of jet heads 11 are connected to the driving shaft 7.

[0032] Specifically, in the process of conveying plastic sheets, the flow rate of the nozzle 11 is adjusted to control the nozzle 11 to spray an airflow with appropriate pressure into the feeding barrel 4. The airflow and the rotation of the spiral conveying plate 9 work together to make the plastic sheets evenly flipped in the feeding barrel 4, so as to improve the drying effect and enable the wet plastic sheets to be dried quickly and evenly. At the same time, the cleaning feeding brush 10 is driven by the rotation of the spiral conveying plate 9 to clean the barrel wall and convey the plastic sheets synchronously to ensure that the plastic sheets do not adhere to the barrel wall and affect the dehumidification effect during the drying process. At the same time, the air intake hole 5 is cleaned to prevent impurities on the plastic sheets from clogging the air intake hole 5 when discharged, thereby ensuring the smoothness and efficiency of the entire drying and dehumidification process.

[0033] The above, such as Figure 5 As shown, the heat transfer part includes a heater 12 and a heat-conducting frame 13. The heat-conducting frame 13 is coaxially and fixedly installed at one end of the feeding barrel 4 away from the first driving motor 6. One end of the heat-conducting frame 13 is coaxially and rotationally connected with the driving shaft 7. The heater 12 is fixedly installed on the heat-conducting frame 13. A cavity is arranged inside the heat-conducting frame 13. The heat-conducting frame 13 also includes a heating wire 14 and a heat-conducting sheet 15. The heating wire 14 is spirally fixedly installed in the cavity inside the heat-conducting frame 13. The heating wire 14 is connected to the output end of the heater 12. A plurality of heat-conducting sheets 15 are fixedly installed at equal angles in a circular shape inside the heat-conducting frame 13. The heat-conducting sheet 15 is fixedly connected to the heating wire 14.

[0034] Specifically, when the plastic sheet needs to be dried, the heater 12 is turned on. Through the setting of the heater 12, the heating wire 14 is heated by the electric current, and the generated heat is evenly transferred to the heat conductive sheet 15. When the air is transported into the driving shaft 7, the air flows through multiple heat conductive sheets 15, so that the air entering the driving shaft 7 is heated, thereby improving the drying efficiency, quickly removing moisture from the plastic sheet, and achieving an ideal drying effect. In order to ensure that the drying process is safer, a corresponding temperature monitoring device can also be provided in the feeding barrel 4 to monitor the temperature changes in the feeding barrel 4 in real time to prevent overheating and ensure stable operation of the equipment.

[0035] like Figure 2 , Figure 3 As shown, the circulating air supply component is installed on the equipment frame 1, and is used to supply air to the dehumidification feeding component during the dehumidification process. The circulating air supply component includes a blower 16 and a filter return air unit. The blower 16 is fixedly installed on the equipment frame 1, and the output end of the blower 16 is connected to the end of the heat conduction frame 13 away from the driving shaft 7. The filter return air unit is installed on the blower 16, and is used to extract the air entering the feeding barrel 4 and filter it, and then re-enter the feeding barrel 4.

[0036] Specifically, when conveying air, start the blower 16 to send air into the driving shaft 7 through the heat-conducting frame 13. After the plastic sheets in the feeding barrel 4 are dried, they are recycled through the filter return air part, ensuring the cleanliness and recycling rate of the air, maintaining smooth air circulation, and thus extending the service life of the equipment.

[0037] The above, such as Figure 3 As shown, the filtering return air section includes a dust collector 17, which is arranged on the side of the equipment frame 1, and also includes a suction pipe 18 and a return air pipe 19. One end of the suction pipe 18 is connected to the input end of the dust collector 17, and the other end of the suction pipe 18 is connected to the hollow layer of the feeding barrel 4. The return air pipe 19 is connected between the output end of the dust collector 17 and the output end of the blower 16.

[0038] Specifically, in the process of feeding and drying the plastic sheets in the feeding barrel 4, the high-temperature air entering the feeding barrel 4 will pass through the suction hole 5, and the air mixed with impurities will be synchronously sucked into the hollow layer under the action of the suction pipe 18, and then sucked into the dust collector 17 through the suction pipe 18. After being filtered by the dust collector 17, the impurities are effectively removed, and the return air pipe 19 returns the filtered clean air to the blower 16, forming a relatively closed circulation system, which not only reduces energy consumption, but also reduces the influence of the external environment on the drying quality of the plastic sheets in the feeding barrel 4, thereby achieving an efficient and energy-saving drying effect during continuous operation.

[0039] The above, such as Figure 6 As shown, it also includes an electrostatic sorting component. The electrostatic sorting component is installed inside the equipment frame 1. The electrostatic sorting component is connected to the discharge end of the discharge hopper 3 and is used to sort plastic sheets. The electrostatic sorting component includes a vibrating feeder frame 20, which is installed inside the equipment frame 1. It also includes a uniform feeding hopper 21, a lower hopper 22 and a sorting part. The uniform feeding hopper 21 is fixedly installed inside the equipment frame 1, and the feed end of the uniform feeding hopper 21 is connected to the discharge end of the discharge hopper 3. The discharge end of the uniform feeding hopper 21 is located on the upper part of the vibrating feeding frame 20. The lower hopper 22 is fixedly installed inside the equipment frame 1, and the feed end of the lower hopper 22 is located at the discharge end of the vibrating feeding frame 20. The sorting part is installed inside the equipment frame 1, and is used to sort plastic sheets of different materials.

[0040] Specifically, after the wet plastic sheets are dried, they are conveyed to the discharge hopper 3, where they can be sorted. At this time, the plastic sheets enter the uniform feeding hopper 21 and fall evenly onto the vibrating feeding rack 20. The vibrating feeding rack 20 is then turned on. Through the shaking action of the vibrating feeding rack 20, the plastic sheets are evenly dropped during transportation and enter the lower hopper 22. Then, they enter the sorting section through the lower hopper 22, where the plastic sheets can be sorted.

[0041] The above, such as Figure 6As shown, the sorting part includes a second drive motor 23, which is fixedly mounted on the equipment frame 1, and also includes a sorting roller 24, a corona electrode 26 and a collecting hopper 27. The sorting roller 24 is rotatably mounted inside the equipment frame 1, and the sorting roller 24 is located at the bottom of the discharge end of the lower hopper 22. One end of the sorting roller 24 is fixedly connected to the output end of the second drive motor 23 through a second transmission mechanism 25. The second transmission mechanism 25 also adopts a belt drive method. The end of the sorting roller 24 and the output end of the second drive motor 23 are both connected with a pulley. The two pulleys are tensioned and connected by a transmission belt. At the same time, a tensioning device is provided to maintain appropriate tension to ensure stable and efficient transmission. The corona electrode 26 is fixedly mounted inside the equipment frame 1. The corona electrode 26 is arranged parallel to the sorting roller 24 and maintains a certain distance to form a non-uniform electric field. The collecting hopper 27 is fixedly mounted inside the equipment frame 1. The collecting hopper 27 adopts a multi-stage slot design to collect and classify plastic materials according to their types.

[0042] Specifically, when the plastic sheets discharged from the lower hopper 22 are sorted, the sorting drum 24 is driven to rotate by the setting of the second driving motor 23, and at the same time, a corona discharge is generated by applying a high voltage of 10-50kV to the corona electrode 26, so that the air is ionized to form a corona electric field. The sorting drum 24 serves as the grounding electrode of the sorting system and forms a closed electric field with the corona electrode 26. The plastic sheets are charged by contact with the ionized gas in the electric field. The charged plastic sheets are adsorbed to the surface of the sorting drum 24 or detached from the sorting drum 24 under the action of the electric field force. The rotation speed of the sorting drum 24 is adjusted to control the residence time of the plastic sheets in the electric field. According to the positive and negative polarity of the static electricity, the plastic sheets will fall into the collection hopper 27 of the corresponding level respectively. In this way, plastic sheets of different materials and weights can be effectively separated, and finally the purpose of recycling and reuse is achieved.

[0043] The working principle or usage process of this application is: When sorting plastic sheets of different materials, it is necessary to feed the plastic sheets of different materials into the feed hopper 2 respectively, and adjust the parameters of the first drive motor 6, the blower 16 and the heater 12 at the same time. When the plastic sheets enter the feeding tube 4, the first drive motor 6 is started, and the first drive motor 6 drives the drive shaft 7 to rotate, and the drive shaft 7 drives the spiral conveying plate 9 to rotate, and the feeding brush rotates synchronously at the same time, and the plastic sheets are gradually pushed to the discharge hopper 3. At this time, the drive shaft 7 and the heat-conducting frame 13 rotate relative to each other. At the same time, under the action of the blower 16, air is continuously fed into the drive shaft 7. In this process, through the setting of the heater 12, the heating wire 14 is heated by the current, and the heat generated is evenly transferred to the heat-conducting sheet 15. When the blower 16 conveys air into the drive shaft 7, the air flows through Multiple heat-conducting sheets 15 are provided to heat the air entering the driving shaft 7. At the same time, the flow rate of the nozzle 11 is adjusted, and the nozzle 11 is controlled to spray an airflow with suitable pressure into the feeding barrel 4. Through the combined effect of the airflow and the rotation of the spiral conveying plate 9, the plastic sheets are evenly turned over in the feeding barrel 4, which has a drying effect, so that the wet plastic sheets can be quickly and evenly dried. At the same time, the cleaning feeding brush 10 is driven by the rotation of the spiral conveying plate 9 to clean the barrel wall and synchronously convey the plastic sheets to ensure that the plastic sheets do not adhere to the barrel wall during the drying process and affect the dehumidification effect. At the same time, the air intake hole 5 is cleaned to prevent impurities on the plastic sheets from clogging the air intake hole 5 when discharged, thereby ensuring the smoothness and efficiency of the entire drying and dehumidification process, quickly removing moisture from the plastic sheets, and achieving an ideal drying effect.

[0044] During the process of feeding and drying the plastic sheets in the feeding barrel 4, the high-temperature air entering the feeding barrel 4 will pass through the setting of the air suction hole 5, and the air mixed with impurities will be synchronously sucked into the hollow layer under the action of the suction pipe 18, and then sucked into the dust collector 17 through the setting of the suction pipe 18. After being filtered by the dust collector 17, the impurities are effectively removed, and the return air pipe 19 returns the filtered clean air to the blower 16, forming a relatively closed circulation system, which not only reduces energy consumption, but also reduces the influence of the external environment on the drying quality of the plastic sheets in the feeding barrel 4. The design of the hollow layer effectively isolates the hot air from the external environment, avoids heat loss, and further improves the dehumidification efficiency.

[0045] The surface of the treated plastic sheet is dry and clean. Finally, with the cooperation of the cleaning feeding brush 10 and the spiral conveying plate 9, the plastic sheet is discharged from the discharge hopper 3 into the uniform feeding hopper 21 and falls evenly onto the vibrating feeding rack 20. Then, the vibrating feeding rack 20 is turned on. Through the shaking action of the vibrating feeding rack 20, the plastic sheet is uniformly dropped into the lower hopper 22 during transportation, and then enters the sorting area through the lower hopper 22. At this time, the second driving motor 23 is set to drive the sorting drum 24 to rotate, and at the same time, a corona discharge is generated by applying a high voltage of 10-50kV to the corona electrode 26. The air is ionized to form a corona electric field, and the sorting drum 24 serves as the grounding electrode of the sorting system, forming a closed electric field with the corona electrode 26. The plastic sheets are charged by contact with the ionized gas in the electric field, and the charged plastic sheets are adsorbed to the surface of the sorting drum 24 or separated from the sorting drum 24 under the action of the electric field force. The rotation speed of the sorting drum 24 is adjusted to control the residence time of the plastic sheets in the electric field. According to the positive and negative polarities of static electricity, the plastic sheets will fall into the collection hopper 27 of the corresponding level respectively. In this way, plastic sheets of different materials and weights can be effectively separated, and ultimately the purpose of recycling and reuse is achieved.

[0046] Embodiment 2: Based on a plastic electrostatic separation device, this embodiment 2 also proposes a plastic electrostatic separation method, which includes the following steps: The first step is to feed the wet plastic sheets of different materials into the feed hopper 2, and adjust the parameters of the first drive motor 6, the blower 16 and the heater 12; The second step is feeding. When the plastic sheet enters the feeding tube 4, the first driving motor 6 is started, and the first driving motor 6 drives the driving shaft 7 to rotate, and the driving shaft 7 drives the spiral conveying plate 9 to rotate. At the same time, the feeding brush rotates synchronously to gradually push the plastic sheet to the discharge hopper 3. At this time, the driving shaft 7 and the heat conduction frame 13 generate relative rotation; The third step is to supply air, under the action of the blower 16, continuously supply air to the inside of the drive shaft 7; The fourth step is to heat the air. The heater 12 is set so that the heating wire 14 generates heat through the current, and the generated heat is evenly transferred to the heat conductive sheet 15. When the blower 16 delivers air into the drive shaft 7, the air flows through the plurality of heat conductive sheets 15, so that the air entering the drive shaft 7 is heated. The fifth step is drying. The flow rate of the nozzle 11 is adjusted, and the nozzle 11 is controlled to spray an airflow with suitable pressure into the feeding barrel 4. Through the joint action of the airflow, the spiral conveying plate 9 and the rotation of the cleaning feeding brush 10, the plastic sheets are evenly turned in the feeding barrel 4, which has a drying effect, so that the wet plastic sheets can be quickly and evenly dried. At the same time, the cleaning feeding brush 10 is driven by the rotation of the spiral conveying plate 9 to clean the barrel wall and synchronously convey the plastic sheets to ensure that the plastic sheets do not adhere to the barrel wall during the drying process and affect the dehumidification effect. At the same time, the air intake hole 5 is cleaned to prevent impurities on the plastic sheets from clogging the air intake hole 5 when being discharged, thereby ensuring the smoothness and efficiency of the entire drying and dehumidification process, quickly removing moisture from the plastic sheets, and achieving an ideal drying effect. The sixth step is air impurity removal circulation. In the process of feeding and drying the plastic sheets in the feeding barrel 4, the high-temperature air entering the feeding barrel 4 will pass through the setting of the air suction hole 5. The air mixed with impurities will be synchronously sucked into the hollow layer under the action of the air suction pipe 18, and then sucked into the dust collector 17 through the setting of the air suction pipe 18. After being filtered by the dust collector 17, the impurities are effectively removed, and the return air pipe 19 returns the filtered clean air to the blower 16, forming a relatively closed circulation system, which not only reduces energy consumption, but also reduces the influence of the external environment on the drying quality of the plastic sheets in the feeding barrel 4. The design of the hollow layer effectively isolates the hot air from the external environment, avoids heat loss, and further improves the dehumidification efficiency; The seventh step is unloading. The surface of the processed plastic sheet is dry and clean. Finally, under the cooperation of the cleaning feeding brush 10 and the spiral conveying plate 9, the plastic sheet is discharged from the discharge hopper 3 into the uniform feeding hopper 21 and falls evenly onto the vibrating feeding rack 20. Then, the vibrating feeding rack 20 is turned on. Through the shaking action of the vibrating feeding rack 20, the plastic sheet is evenly discharged during transportation and enters the lower hopper 22. Then, the plastic sheet enters the sorting area through the lower hopper 22. The eighth step is sorting. The second driving motor 23 is used to drive the sorting drum 24 to rotate. At the same time, a high voltage of 10-50kV is applied to the corona electrode 26 to generate corona discharge, so that the air is ionized to form a corona electric field. The sorting drum 24 serves as the grounding electrode of the sorting system and forms a closed electric field with the corona electrode 26. The plastic sheets are charged by contact with the ionized gas in the electric field. The charged plastic sheets are adsorbed to the surface of the sorting drum 24 or separated from the sorting drum 24 under the action of the electric field force. The rotation speed of the sorting drum 24 is adjusted to control the residence time of the plastic sheets in the electric field. According to the positive and negative polarity of the static electricity, the plastic sheets will fall into the collection hopper 27 of the corresponding level respectively. In this way, plastic sheets of different materials and weights can be effectively separated, and finally the purpose of recycling and reuse is achieved.

[0047] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure rather than to limit it. Although the present disclosure has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present disclosure may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present disclosure, which should be included in the scope of the claims of the present disclosure.

Claims

1. A plastic electrostatic sorting device, comprising an equipment frame (1), wherein a feed hopper (2) and a discharge hopper (3) are fixedly mounted on the top of the equipment frame (1), and the feed hopper (2) and the discharge hopper (3) are respectively arranged on two sides of the top of the equipment frame (1), characterized in that: Also includes: A feeding barrel (4), wherein the feeding barrel (4) is fixedly mounted on the top of the equipment frame (1), the discharge end of the feeding hopper (2) and the feeding end of the discharge hopper (3) are respectively connected to the two ends of the feeding barrel (4), a hollow layer is arranged inside the feeding barrel (4), and a plurality of suction holes (5) are opened at equal angles in a circular shape inside the feeding barrel (4), and each of the suction holes (5) is connected to the hollow layer; A dehumidification feeding assembly, the dehumidification feeding assembly is installed inside the feeding barrel (4), and is used to feed the plastic sheets fed into the feeding barrel (4) through the feeding hopper (2) into the discharge hopper (3), and simultaneously perform a dehumidification and impurity removal operation on the wet plastic sheets; A circulating air supply component is installed on the equipment rack (1) and is used to supply air to the dehumidification feeding component during the dehumidification process.

2. According to the plastic electrostatic separation device of claim 1, the dehumidification feeding assembly comprises a first driving motor (6), and the first driving motor (6) is fixedly mounted on the equipment frame (1), characterized in that: Also includes: A drive shaft (7), the drive shaft (7) being coaxially rotatably mounted inside the feeding barrel (4), one end of the drive shaft (7) being fixedly connected to an output end of the first drive motor (6) via a first transmission mechanism (8); Wherein, the interior of the driving shaft (7) is configured as a hollow structure; A spiral conveying plate (9), wherein the spiral conveying plate (9) is fixedly mounted on the driving shaft (7), and a gap is left between the spiral conveying plate (9) and the inner wall of the feeding barrel (4); an exhaust portion, the exhaust portion being mounted on the driving shaft (7) and being used to dry the plastic sheets by conveying high-temperature air into the feeding cylinder (4); A heat transfer portion, the heat transfer portion being mounted on the feeding barrel (4) and being used to heat the air entering the feeding barrel (4).

3. A plastic electrostatic separation device according to claim 2, characterized in that: The exhaust section comprises: A cleaning feeding brush (10), wherein the cleaning feeding brush (10) is fixedly mounted on the spiral conveying plate (9), and the cleaning feeding brush (10) abuts against the inner wall of the feeding cylinder (4); A jet belt is spirally arranged on the driving shaft (7), the spirally arranged jet belt and the spiral conveying plate (9) are staggered with each other, and the jet belt is composed of a plurality of jet heads (11), and the plurality of jet heads (11) are connected to the driving shaft (7).

4. A plastic electrostatic separation device according to claim 3, wherein the heat transfer portion comprises a heater (12), characterized in that: Also includes: A heat-conducting frame (13) is coaxially and fixedly mounted on an end of the feeding barrel (4) away from the first driving motor (6), one end of the heat-conducting frame (13) is coaxially and rotationally connected to the driving shaft (7), the heater (12) is fixedly mounted on the heat-conducting frame (13), and a cavity is provided inside the heat-conducting frame (13).

5. A plastic electrostatic separation device according to claim 4, characterized in that: Also includes: A heating wire (14), the heating wire (14) being fixedly mounted in a spiral shape in a cavity inside the heat-conducting frame (13), the heating wire (14) being connected to an output end of the heater (12); A plurality of heat-conducting sheets (15) are fixedly mounted at equal angles in a circular shape inside the heat-conducting frame (13), and the heat-conducting sheets (15) are fixedly connected to the heating wire (14).

6. A plastic electrostatic separation device according to claim 5, characterized in that: The circulating air supply component comprises: A blower (16), the blower (16) being fixedly mounted on the equipment frame (1), the output end of the blower (16) being in communication with an end of the heat-conducting frame (13) away from the driving shaft (7); A filter return air section is installed on the blower (16) and is used to extract and filter the air entering the feeding barrel (4) and then re-enter the interior of the feeding barrel (4).

7. A plastic electrostatic separation device according to claim 6, wherein the filter return air section comprises a dust collector (17), and the dust collector (17) is arranged on the side of the equipment frame (1), characterized in that: Also includes: an air suction pipe (18), one end of the air suction pipe (18) being connected to the input end of the dust collector (17), and the other end of the air suction pipe (18) being connected to the hollow layer of the feeding cylinder (4); A return air duct (19), the return air duct (19) being connected between an output end of the dust collector (17) and an output end of the blower (16).

8. A plastic electrostatic separation device according to claim 7, further comprising an electrostatic separation component, wherein the device frame (1) is provided with an electrostatic separation component, wherein the electrostatic separation component is connected to the discharge end of the discharge hopper (3) and is used for separating plastic sheets, wherein the electrostatic separation component comprises a vibrating feeder (20), wherein the vibrating feeder (20) is provided inside the device frame (1), and wherein: Also includes: A uniform feeding hopper (21), the uniform feeding hopper (21) being fixedly mounted inside the equipment frame (1), the feeding end of the uniform feeding hopper (21) being connected to the discharging end of the discharge hopper (3), and the discharging end of the uniform feeding hopper (21) being located on the upper part of the vibrating feeding frame (20); A lower hopper (22), the lower hopper (22) being fixedly mounted inside the equipment frame (1), and the feeding end of the lower hopper (22) being located at the discharging end of the vibrating feeding frame (20); A sorting section, the sorting section is installed inside the equipment frame (1) and is used to sort plastic sheets of different materials.

9. A plastic electrostatic separation device according to claim 8, wherein the separation part comprises a second drive motor (23), and the second drive motor (23) is fixedly mounted on the equipment frame (1), characterized in that: Also includes: a sorting roller (24), the sorting roller (24) being rotatably mounted inside the equipment frame (1), the sorting roller (24) being located at the bottom of the discharge end of the lower hopper (22), one end of the sorting roller (24) being fixedly connected to the output end of the second driving motor (23) via a second transmission mechanism (25); A corona electrode (26), wherein the corona electrode (26) is fixedly mounted inside the equipment frame (1), and the corona electrode (26) is arranged in parallel with the sorting drum (24); A collecting hopper (27) is fixedly installed inside the equipment frame (1), and a multi-level slot design is adopted inside the collecting hopper (27), so as to collect plastic materials by type.

10. A method for electrostatically separating plastics, using the electrostatically separating plastics device according to claim 9, characterized in that: The following steps are involved: The first step is feeding, feeding wet plastic sheets of different materials into the feed hopper (2) respectively; The second step is feeding. After the plastic sheet enters the feeding barrel (4), the first drive motor (6) drives the spiral conveying plate (9) to rotate via the drive shaft (7), and the plastic sheet is gradually pushed into the discharge hopper (3) through the cooperation of the feeding brush. The third step is to supply air, where air is supplied into the interior of the drive shaft (7) under the action of the blower (16); The fourth step is to heat the air. The heater (12) causes the heating wire (14) to generate heat through the electric current, and the generated heat is evenly transferred to the heat conducting sheet (15). When the air flows through the plurality of heat conducting sheets (15), the air entering the driving shaft (7) is heated. The fifth step is drying, through the setting of the nozzle (11), the air flow and the rotation of the spiral conveying plate (9) and the cleaning feeding brush (10) work together to make the wet plastic sheets evenly turn over in the feeding barrel (4), thereby drying; The sixth step is air impurity removal cycle. The high-temperature air entering the feeding tube (4) passes through the air suction hole (5). The air mixed with impurities is sucked into the dust collector (17) through the hollow layer and the air suction pipe (18) under the action of the air suction pipe (18). After being filtered by the dust collector (17), the return air pipe (19) sends the filtered clean air back to the blower (16), forming a cycle. The seventh step is to discharge the plastic sheets. Under the cooperation of the cleaning feeding brush (10) and the spiral conveying plate (9), the plastic sheets are discharged from the discharge hopper (3) into the uniform feeding hopper (21) and evenly fall onto the vibrating feeding rack (20). The vibrating feeding rack (20) causes the plastic sheets to fall evenly during transportation and enter the discharge hopper (22). The plastic sheets then enter the sorting area through the discharge hopper (22). The eighth step is sorting. The second drive motor (23) is used to drive the sorting drum (24) to rotate. A corona discharge is generated by applying high voltage to the corona electrode (26). The sorting drum (24) serves as the grounding electrode of the sorting system and forms a closed electric field with the corona electrode (26). The plastic sheets are charged by contact with the ionized gas in the electric field. The charged plastic sheets are adsorbed onto the surface of the sorting drum (24) or detached from the sorting drum (24) under the action of the electric field force. According to the positive and negative polarities of the static electricity, the plastic sheets fall into the corresponding level of the collecting hopper (27), thereby realizing the sorting of different types of plastic sheets.

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