An exhaust gas purification device in a plastic particle production process

Abstract

The application belongs to the technical field of waste gas purification, and discloses a waste gas purification device in a plastic particle production process, which comprises a purification box. In the application, when waste gas is refluxed, the first air cylinder at the storage box will drive the ejector rod to push outward, so that the push plate pushes the unused activated carbon plate forward, and the activated carbon plate will fall into the feeding groove. Meanwhile, the second air cylinder at the bottom of the purification box operates, so that the sealing plate can move to the driving groove, and then the used activated carbon plate above falls naturally, and the sealing plate in the feeding groove above moves out, so that the activated carbon plate falls naturally, and then replaces the original activated carbon plate for use, and the waste gas purification operation is continuously realized. Since too many personnel are not required to participate in the whole operation process, the overall labor intensity can be effectively reduced, and shutdown maintenance is not required, the operation continuity can be ensured, the operation efficiency is improved, and the application has the advantages of convenient replacement, small operation influence, etc.

Description

Technical Field

[0001] This utility model relates to the field of waste gas purification technology, and in particular to a waste gas purification device in the production process of plastic pellets. Background Technology

[0002] Plastic pellets refer to granular plastic. In daily life, recycled pellets can be used to manufacture various plastic bags, buckets, basins, toys, furniture, stationery and other household items and various plastic products. When manufacturing plastic pellets, workers will use exhaust gas purification devices to purify the exhaust gas generated during the production of plastic pellets in order to prevent it from polluting the environment.

[0003] Chinese utility model patent application number CN202121045427.5 discloses a waste gas purification device for plastic granule production. Its structural design, consisting of a first waste gas box, a second waste gas box, an activated carbon replacement box, and an atomizing sleeve, allows users to activate the atomizer and spray water through the atomizing tube. Waste gas is then injected into the atomizing sleeve to remove dust. The purified gas then enters the activated carbon replacement box in the second waste gas box for further purification. When new activated carbon is needed, the activated carbon replacement box is removed from the second waste gas box, and another activated carbon replacement box with purification capabilities is placed inside. This facilitates dust removal from the waste gas and optimizes the purification effect.

[0004] Regarding the aforementioned technologies, the inventors believe that the following defects exist: Most current waste gas purification devices used in plastic pellet production primarily filter the gas through a filter screen, followed by purification with activated carbon. After prolonged use, the activated carbon requires replacement by workers wearing protective clothing. However, replacing the activated carbon necessitates shutting down the device, which affects its normal operation. Furthermore, prolonged use weakens the activated carbon, leading to the discharge of unpurified waste gas, resulting in environmental pollution and reducing overall practicality. Utility Model Content

[0005] To address the aforementioned problems, this utility model provides a waste gas purification device for the plastic pellet production process.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a waste gas purification device in the production process of plastic granules, including a purification box, a storage box and a collection box are welded to the surface of both ends of the purification box, and a feeding slot is opened at the contact position between the storage box and the surface of the purification box. A driving slot is opened on one side of the feeding slot at the inside of the surface of the purification box. A second cylinder is installed inside the driving slot. A sealing plate is installed at the telescopic end of the second cylinder. One end of the sealing plate passes through one side of the driving slot and is slidably connected to the feeding slot. A push plate is slidably connected inside the storage box and the inside of the collection box. A top rod is fixedly installed at the middle position of one end of the push plate. One end of the top rod is connected to the telescopic end of the first cylinder, and the first cylinder is located at the middle position of the outer surface of the storage box and the collection box, respectively.

[0007] By adopting the above technical solution, the purification box, as the main body of the equipment, is made of welded metal and forms an internal waste gas purification chamber. Storage boxes and collection boxes are welded to both ends, forming an integrated structure to ensure airtightness. The purification box is designed to provide waste gas purification space, housing activated carbon plates to achieve contact adsorption between waste gas and activated carbon. Circulation pipes are installed on both sides of the bottom, and a gas concentration detector and control panel are integrated at the top, forming the core of automated control. The push plate, located inside the storage and collection boxes, is slidably connected to the box's sliding groove. One end of the push plate is fixedly connected to the telescopic end of the first cylinder via a push rod. The cylinder is installed on the outside of the box and fixed with bolts. When new activated carbon plates need to be added, the first cylinder drives the push rod forward, and the push plate pushes the activated carbon plates in the storage box along the sliding groove to the delivery slot. The push plate in the collection box is used to collect used activated carbon plates. Once the collection box is full, it can be disassembled and cleaned. The storage box stores spare activated carbon plates, and the collection box... The box stores expired plates, and an automated feeding and unloading mechanism using a push-plate-cylinder system avoids manual contact with waste gas and activated carbon. The feeding trough is a rectangular channel connecting the purification chamber and the storage / collection box, with grooves on both inner walls that cooperate with the activated carbon plate sliders to guide the plates to fall vertically. The drive trough is located inside the purification chamber wall on one side of the feeding trough, providing installation space for the second cylinder. The second cylinder is bolted to the bottom of the drive trough, and its telescopic end is fixedly connected to a sealing plate. The sealing plate is a rectangular plate with dimensions matching the cross-section of the feeding trough, and rubber sealing rings are provided at the edges to ensure a seal. During normal purification, the sealing plate is inserted into the feeding trough to prevent the activated carbon plates from falling. When replacement is needed, the second cylinder retracts, pulling the sealing plate into the drive trough, opening the feeding trough. The new plate falls from the storage box into the purification chamber, and the old plate falls from the feeding trough on the collection box side into the collection box. Then the cylinder resets, and the sealing plate re-closes the trough opening. Through the cooperation of the sealing plate and the cylinder, gravity automatically completes the replacement of the old and new plates without manual intervention.

[0008] Furthermore, circulation pipes are installed on both sides of the bottom of the purification box, with the two ends of the circulation pipes located at the front and rear sides of the activated carbon plate, respectively.

[0009] By adopting the above technical solution, the circulation pipe is installed on both sides of the bottom of the purification box, with one end connected to the front side of the activated carbon plate and the other end connected to the rear side, forming a U-shaped loop.

[0010] Furthermore, air inlet pipes and air outlet pipes are symmetrically installed on both sides of the purification box.

[0011] By adopting the above technical solution, the inlet pipe and outlet pipe are mainly used for the introduction and discharge of waste gas, so as to ensure the smooth flow of waste gas and facilitate subsequent purification treatment.

[0012] Furthermore, a gas concentration detector is installed at the top of the purification chamber near the outlet pipe.

[0013] By adopting the above technical solution, the gas concentration detector is installed on the top of the purification chamber near the outlet pipe to monitor VOCs, particulate matter and other indicators in the exhaust gas in real time. When the detected value exceeds the preset threshold, a signal is sent to the control panel. In use, after receiving the signal, the control panel operates according to the following procedure: close the outlet pipe solenoid valve, open the circulation pipe solenoid valve, and start the exhaust gas recirculation; trigger the first and second cylinders of the storage box and collection box to complete the automatic replacement of the activated carbon plate; after the replacement is completed, close the circulation pipe solenoid valve, open the outlet pipe solenoid valve, and restore the normal purification process.

[0014] Furthermore, solenoid valves are installed at both ends of the air outlet pipe and the circulation pipe.

[0015] By adopting the above technical solution, a solenoid valve is installed at each end of the circulation pipe and at the outlet pipe, which are electrically connected through the control panel. When the gas concentration detector detects that the purified gas exceeds the standard, the outlet solenoid valve closes and the circulation pipe solenoid valve opens. The waste gas flows back to the front of the activated carbon plate through the circulation pipe for re-filtration. This achieves the dual treatment of waste gas "primary purification + secondary recirculation", ensuring that the emissions meet the standards and avoiding the pollution risk caused by activated carbon failure.

[0016] Furthermore, a control panel is installed on one side of the top of the purification box.

[0017] By adopting the above technical solution, the control panel is a commonly used controller on the market. It can be a microcontroller processor, PLC processor, or MCU processor. The specific model can be adjusted according to personnel needs, which will not be elaborated on here. At the same time, the control circuit of the control panel can be implemented by simple programming by those skilled in the art. It is common knowledge in the field. It is only used and not modified. Therefore, the control method and circuit connection will not be described in detail. The control panel is connected to an external power supply through wires for convenient power supply.

[0018] Furthermore, the activated carbon plate is provided with symmetrical sliding strips on both sides, and the dispensing tank is provided with symmetrical sliding grooves on both sides.

[0019] By adopting the above technical solution, sliding strips are provided on both sides of the activated carbon plate, forming a sliding pair with the sliding groove of the feeding slot and the sliding groove of the storage box / collection box, ensuring that the plate remains vertical during pushing and falling, and avoiding jamming; in use, after the new plate falls from the storage box into the purification box through the feeding slot, the sliding strips are embedded in the invisible sliding grooves on the inner wall of the purification box and fixed in the middle of the purification box, forming a horizontal filter layer. After the exhaust gas enters from the air inlet pipe, it passes horizontally through the pores of the activated carbon plate, and harmful substances are adsorbed; when replacing, the failed plate falls into the collection box due to gravity when the sealing plate is opened. The pusher plate pushes it to the end of the box for temporary storage under the action of the first cylinder. After the collection box is full, the whole plate is replaced.

[0020] Furthermore, the spacing between the sealing plates is the same as the working surface size of the activated carbon plate, the internal dimensions of the storage box and the collection box are the same as the size of the activated carbon plate, and the inner wall of the storage box and the inside of the collection box are provided with sliding grooves.

[0021] By adopting the above technical solution, the storage box and the collection box are fixed to both ends of the purification box by welding. A delivery slot is opened on the contact surface with the purification box. The size of the slot is matched with the activated carbon plate. Sliding grooves are provided on the bottom and sides of the interior, which form a sliding fit with the sliding strips on both sides of the activated carbon plate to ensure smooth horizontal movement of the activated carbon plate.

[0022] In summary, this utility model has the following beneficial effects:

[0023] 1. In this application, during the waste gas recirculation, the first cylinder at the storage box drives the push rod to push outward, thereby causing the push plate to push the unused activated carbon plate forward. As the pushing continues, the activated carbon plate falls into the feeding slot. At the same time, the second cylinder at the bottom of the purification box operates, allowing the sealing plate to move to the drive slot, causing the used activated carbon plate above it to fall naturally. After a certain period of operation, the sealing plate returns to its original position, and the sealing plate in the feeding slot above is removed, causing the activated carbon plate to fall naturally and replace the original activated carbon plate for continued waste gas purification. The sealing plate also returns to its original position, thus achieving a sealing operation of the structure, preventing waste gas leakage, and ensuring safety. Since the entire operation does not require much personnel intervention, it can effectively reduce the overall labor intensity, facilitate better use, and eliminate the need for downtime maintenance, ensuring continuous operation, improving work efficiency, and having the advantages of convenient replacement and minimal impact on operation.

[0024] 2. In this application, after a long period of waste gas treatment, the purification effect of the activated carbon plate will decrease. At this time, the gas concentration detector behind the activated carbon plate will detect that the concentration of harmful substances exceeds the preset range. At this time, the solenoid valve at the outlet pipe will close, and the solenoid valve at the circulation pipe will open. This will allow the waste gas that has not been fully treated to flow back to the front of the activated carbon plate, so that this part of the waste gas can be purified again, ensuring the overall purification quality and improving the overall use quality. It has the advantage of strong practicality. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0026] Figure 2 This is a schematic diagram of the dispensing slot according to an embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram of the structure of the activated carbon plate according to an embodiment of the present invention;

[0028] Figure 4 This is a partial cross-sectional view of the collection box according to an embodiment of the present utility model.

[0029] In the diagram: 1. Purification box; 2. Inlet pipe; 3. Control panel; 4. Dispensing trough; 5. Sealing plate; 6. Storage box; 7. Activated carbon plate; 8. Push plate; 9. Top rod; 10. First cylinder; 11. Gas concentration detector; 12. Solenoid valve; 13. Outlet pipe; 14. Circulation pipe; 15. Collection box; 16. Second cylinder; 17. Drive trough. Detailed Implementation

[0030] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0031] like Figures 1-4As shown in the embodiment of this application, a waste gas purification device in the production process of plastic granules is disclosed, including a purification box 1. A storage box 6 and a collection box 15 are welded to the surface of both ends of the purification box 1, respectively. A feeding groove 4 is opened at the contact position between the storage box 6 and the collection box 15 and the surface of the purification box 1. A drive groove 17 is opened on one side of the feeding groove 4 inside the surface of the purification box 1. A second cylinder 16 is installed inside the drive groove 17. A sealing plate 5 is installed on the telescopic end of the second cylinder 16. One end of the sealing plate 5 passes through one side of the drive groove 17 and is slidably connected to the feeding groove 4. A push plate 8 is slidably connected inside the storage box 6 and the collection box 15. A top rod 9 is fixedly installed at the middle position of one end of the push plate 8. One end of the top rod 9 is connected to the first cylinder 1. The telescopic ends are connected, and the first cylinder 10 is located at the middle of the outer surface of the storage box 6 and the collection box 15. The purification box 1, as the main body of the equipment, is made of metal and welded together. It forms an exhaust gas purification chamber inside. The storage box 6 and the collection box 15 are welded to the two ends respectively. The three form an integrated structure to ensure airtightness. The purification box 1 is set to provide exhaust gas purification space. It contains activated carbon plates 7 to achieve contact adsorption between exhaust gas and activated carbon. Circulation pipes 14 are installed on both sides of the bottom. The top integrates a gas concentration detector 11 and a control panel 3 to form the core of automatic control. Push plate 8: Located inside the storage box 6 and the collection box 15, it is slidably connected to the box body slide groove. One end of the push plate 8 is fixed to the telescopic end of the first cylinder 10 through the push rod 9. The cylinder is installed on the outside of the box body and fixed with bolts. When a new activated carbon plate 7 needs to be added, the first cylinder 10 drives the push rod 9 to push forward, and the push plate 8 pushes the activated carbon plate 7 in the storage box 6 along the slide groove to the delivery slot 4. The push plate 8 in the collection box 15 is used to collect the used activated carbon plate 7. When the collection box 15 is full, it can be disassembled and cleaned as a whole. The storage box 6 stores spare activated carbon plates 7, and the collection box 15 collects the used plates. The push plate 8-cylinder mechanism realizes automatic replenishment and unloading, avoiding manual contact with waste gas and activated carbon. The delivery slot 4 is a rectangular channel that runs through the purification box 1 and the storage box 6 / collection box 15. The inner walls on both sides are opened with slide grooves, which cooperate with the slide strips of the activated carbon plate 7 to guide the plate to fall vertically. The drive slot 17 is located in the delivery slot. The second cylinder 16 is installed inside the wall of the purification box 1 on one side. The second cylinder 16 is fixed to the bottom of the drive groove 17 by bolts. The telescopic end is fixedly connected to the sealing plate 5. The sealing plate 5 is a rectangular plate with dimensions matching the cross-section of the delivery groove 4. Rubber sealing rings are provided on the edge to ensure sealing. During normal purification, the sealing plate 5 is inserted into the delivery groove 4 to prevent the activated carbon plate 7 from falling. When replacement is required, the second cylinder 16 retracts, pulling the sealing plate 5 into the drive groove 17. The delivery groove 4 opens, and the new plate falls from the storage box 6 into the purification box 1. The old plate falls from the delivery groove 4 on the side of the collection box 15 into the collection box 15. Then the cylinder resets, and the sealing plate 5 re-closes the groove. Through the cooperation of the sealing plate 5 and the cylinder, the replacement of the old and new plates is automatically completed by gravity without manual intervention.

[0032] likeFigure 1 As shown, circulation pipes 14 are installed on both sides of the bottom of the purification box 1, and the two ends of the circulation pipes 14 are located on the front and rear sides of the activated carbon plate 7, respectively. The circulation pipes 14 are installed on both sides of the bottom of the purification box 1, with one end connected to the front side of the activated carbon plate 7 and the other end connected to the rear side, forming a U-shaped loop.

[0033] like Figure 1 As shown, air inlet pipe 2 and air outlet pipe 13 are symmetrically installed on both sides of the purification box 1. The air inlet pipe 2 and air outlet pipe 13 are mainly used for the introduction and discharge of waste gas to ensure the smooth flow of waste gas and facilitate subsequent purification treatment.

[0034] like Figure 1 As shown, a gas concentration detector 11 is installed at the top of the purification chamber 1 near the outlet pipe 13. The gas concentration detector 11 monitors VOCs, particulate matter, and other indicators in the exhaust gas in real time. When the detected value exceeds a preset threshold, it sends a signal to the control panel 3. During use, after receiving the signal, the control panel 3 operates as follows: it closes the solenoid valve 12 of the outlet pipe 13, opens the solenoid valve 12 of the circulation pipe 14, and initiates exhaust gas recirculation; it triggers the first cylinder 10 and the second cylinder 16 of the storage box 6 and the collection box 15 to complete the process. The activated carbon plate 7 is automatically replaced; after replacement, the solenoid valve 12 of the circulation pipe 14 is closed, and the solenoid valve 12 of the outlet pipe 13 is opened to restore the normal purification process; the gas concentration detector 11 can be selected according to the requirements, such as: PID photoionization detector, which uses ultraviolet lamp to ionize VOCs molecules and measures the concentration by current change; FTIR Fourier transform infrared spectrometer, which qualitatively and quantitatively analyzes the characteristic peaks of the molecular absorption infrared spectrum. Since gas concentration detection technology is a mature existing technology and is frequently used in the field of gas detection, it will not be described in detail.

[0035] like Figure 1 As shown, solenoid valves 12 are installed at both ends of the outlet pipe 13 and the circulation pipe 14. One solenoid valve 12 is installed at each end of the circulation pipe 14 and at the outlet pipe 13. They are electrically connected through the control panel 3. When the gas concentration detector 11 detects that the purified gas exceeds the standard, the solenoid valve 12 of the outlet pipe 13 closes and the solenoid valve 12 of the circulation pipe 14 opens. The exhaust gas flows back to the front of the activated carbon plate 7 through the circulation pipe 14 for re-filtration. This achieves the dual treatment of exhaust gas "primary purification + secondary recirculation" to ensure that the emission meets the standards and avoids the pollution risk caused by activated carbon failure.

[0036] like Figure 1As shown, a control panel 3 is installed on one side of the top of the purification box 1. The control panel 3 is a commonly used controller on the market, which can be a microcontroller processor, PLC processor or MCU processor. The specific model can be adjusted according to personnel needs, which will not be elaborated here. At the same time, the control circuit of the control panel 3 can be implemented by simple programming by those skilled in the art. It is common knowledge in the field. It is only used and not modified. Therefore, the control method and circuit connection will not be described in detail. The control panel 3 is connected to an external power supply through wires for convenient power supply.

[0037] like Figure 1 and Figure 3 As shown, symmetrical sliding strips are provided on both sides of the activated carbon plate 7, and symmetrical sliding grooves are provided on both sides of the surface of the feeding slot 4. The sliding strips on both sides of the activated carbon plate 7 form a sliding pair with the sliding grooves of the feeding slot 4 and the sliding grooves of the storage box 6 / collection box 15, ensuring that the plate remains vertical during pushing and falling, and avoiding jamming. In use, after the new plate falls from the storage box 6 into the purification box 1 through the feeding slot 4, the sliding strips are embedded in the invisible sliding grooves on the inner wall of the purification box 1 and fixed in the middle of the purification box 1, forming a horizontal filter layer. After the exhaust gas enters from the air inlet pipe 2, it passes horizontally through the pores of the activated carbon plate 7, and harmful substances are adsorbed. When replacing, when the sealing plate 5 is opened, the failed plate falls into the collection box 15 due to gravity. The push plate 8 pushes it to the end of the box for temporary storage under the action of the first cylinder 10. The whole plate is replaced when the collection box 15 is full.

[0038] like Figure 1 and Figure 3 As shown, the spacing between the sealing plates 5 is the same as the working surface size of the activated carbon plate 7. The internal dimensions of the storage box 6 and the collection box 15 are the same as the dimensions of the activated carbon plate 7. The inner wall of the storage box 6 and the inside of the collection box 15 are provided with sliding grooves. The storage box 6 and the collection box 15 are fixed to both ends of the purification box 1 by welding. The surface in contact with the purification box 1 is provided with a delivery slot 4. The slot opening size matches the activated carbon plate 7. The bottom surface and both sides of the interior are provided with sliding grooves, which form a sliding fit with the sliding strips on both sides of the activated carbon plate 7 to ensure smooth horizontal movement of the activated carbon plate 7.

[0039] The working principle of the waste gas purification equipment in the plastic granule production process in this embodiment is as follows: During use, the waste gas generated during the production of plastic granules, after dust removal, can be introduced. At this time, the waste gas will enter the purification box 1 through the air inlet pipe 2, and be adsorbed and purified by the activated carbon on the activated carbon plate 7 inside the purification box 1. The purified gas can be discharged through the air outlet pipe 13, which is convenient for subsequent purification or release operations. Moreover, after a long period of waste gas treatment, the purification effect of the activated carbon plate 7 will decrease. At this time, the gas concentration detector 11 behind the activated carbon plate 7 will detect that the concentration of harmful substances exceeds the preset range. At this time, the solenoid valve 12 at the air outlet pipe 13 will close, and the solenoid valve 12 at the circulation pipe 14 will open, so that the waste gas that has not been fully treated will flow back to the front of the activated carbon plate 7, so that this part of the waste gas can be purified again. When the waste gas flows back, the first cylinder 10 at the storage box 6 will drive the push rod 9 to push outward. The pusher plate 8 pushes the unused activated carbon plate 7 forward. As the push continues, the activated carbon plate 7 falls into the feeding trough 4. At the same time, the second cylinder 16 at the bottom of the purification box 1 operates, allowing the sealing plate 5 to move to the drive trough 17, causing the used activated carbon plate 7 above it to fall naturally. After a certain period of operation, the sealing plate 5 returns to its original position, and the sealing plate 5 in the feeding trough 4 above it moves out, causing the activated carbon plate 7 to fall naturally and replace the original activated carbon plate 7 for continued use in the waste gas purification operation. The sealing plate 5 also returns to its original position, thus achieving a sealing operation of the structure, preventing waste gas leakage and ensuring safety. Since the entire operation does not require much personnel intervention, it can effectively reduce the overall labor intensity, making it easier to use. At the same time, it does not require downtime maintenance, ensuring continuous operation and improving work efficiency. The device as a whole has the advantages of convenient replacement, minimal operational impact, and strong practicality.

[0040] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A waste gas purification device for the production process of plastic pellets, comprising a purification chamber (1), characterized in that: The purification box (1) has a storage box (6) and a collection box (15) welded to its two ends respectively. The storage box (6) and the collection box (15) are provided with a feeding slot (4) at the contact position with the surface of the purification box (1). A drive slot (17) is provided on one side of the feeding slot (4) inside the surface of the purification box (1). A second cylinder (16) is installed inside the drive slot (17). A sealing plate (5) is installed on the telescopic end of the second cylinder (16). One end of the sealing plate (5) passes through the drive slot (17) and is slidably connected to the feeding slot (4). A push plate (8) is slidably connected inside the storage box (6) and the collection box (15). A top rod (9) is fixedly installed at the middle position of one end of the push plate (8). One end of the top rod (9) is connected to the telescopic end of the first cylinder (10). The first cylinder (10) is located at the middle position of the outer surface of the storage box (6) and the collection box (15) respectively.

2. The waste gas purification equipment in the plastic pellet production process according to claim 1, characterized in that: The purification box (1) is equipped with circulation pipes (14) on both sides of the bottom, and the two ends of the circulation pipes (14) are located on the front and rear sides of the activated carbon plate (7), respectively.

3. The waste gas purification equipment in the plastic pellet production process according to claim 1, characterized in that: The air inlet pipe (2) and air outlet pipe (13) are symmetrically installed on both sides of the purification box (1).

4. The waste gas purification equipment in the plastic pellet production process according to claim 1, characterized in that: A gas concentration detector (11) is installed at the top of the purification box (1) near the outlet pipe (13).

5. The waste gas purification equipment in the plastic pellet production process according to claim 3, characterized in that: Solenoid valves (12) are installed at both ends of the air outlet pipe (13) and the circulation pipe (14).

6. The waste gas purification equipment in the plastic pellet production process according to claim 1, characterized in that: A control panel (3) is installed on one side of the top of the purification box (1).

7. The waste gas purification equipment in the plastic pellet production process according to claim 2, characterized in that: The activated carbon plate (7) is provided with sliding strips symmetrically on both sides, and the feeding trough (4) is provided with sliding grooves symmetrically on both sides.

8. The waste gas purification equipment in the plastic pellet production process according to claim 1, characterized in that: The spacing of the sealing plate (5) is the same as the working surface size of the activated carbon plate (7). The internal dimensions of the storage box (6) and the collection box (15) are the same as the size of the activated carbon plate (7). The inner wall of the storage box (6) and the inside of the collection box (15) are provided with sliding grooves.

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