PVC injection molding piece processing tail gas purification treatment device

Abstract

The application discloses a PVC injection molding part processing tail gas purification treatment device, which comprises an adsorption treatment frame and an activated carbon adsorption assembly installed in the adsorption treatment frame, a top plate is fixedly installed at the top of the adsorption treatment frame, an exhaust hole is formed in the top of the top plate, and a connecting plate is fixedly installed at the bottom of the adsorption treatment frame; driving force is generated by utilizing high-speed airflow impact of tail gas on the impeller assembly, the activated carbon adsorption assembly is driven to rotate at low speed without additionally adding a motor, airflow is disturbed by driving the turbulence page plate, equipment power consumption is greatly reduced, energy recycling is realized, the rotary activated carbon structure is matched with a partition separation design, activated carbon particles in each region can be uniformly replaced to contact tail gas, the problems of local rapid saturation of a traditional fixed activated carbon device, and waste of most carbon materials are solved, the overall adsorption utilization rate of activated carbon is effectively improved, and the purification effect of VOCs, acidic gas and particulate matters in PVC injection tail gas is continuously ensured.

Description

Technical Field

[0001] This invention relates to the field of activated carbon adsorption treatment technology for exhaust gas, specifically to a device for purifying exhaust gas from PVC injection molding processes. Background Technology

[0002] PVC bathtubs are large plastic products commonly used in the bathroom industry. They are mainly made from modified PVC raw materials combined with plasticizers, heat stabilizers, lubricants, and other additives, processed through high-temperature melting, high-pressure injection molding, and cooling and shaping. During the bathtub injection molding process, the injection temperature is typically maintained between 180℃ and 220℃. Under such high temperatures, PVC resin is prone to slight thermal decomposition, and various organic additives volatilize in large quantities, producing complex, highly corrosive process exhaust gases with a strong, pungent odor. These exhaust gases mainly contain acidic corrosive gases such as hydrogen chloride, benzene compounds, aldehydes and ketones (VOCs), plastic oil fumes, fine injection dust, and malodorous pollutants. They are characterized by high temperature, large humidity fluctuations, the presence of oil mist and viscous impurities, and significant fluctuations in pollutant concentration. If these exhaust gases are directly emitted without effective purification, they will not only cause air pollution around the factory area, but the volatile organic pollutants will also remain dispersed in the production workshop for a long time, seriously harming the respiratory system and skin health of the operators.

[0003] Currently, traditional purification devices for PVC bathtub injection molding exhaust gases mostly employ a single-layer activated carbon adsorption, simple water washing spray, or filter filtration structure, which has many inherent defects in actual production applications. Firstly, traditional equipment lacks a dedicated, high-efficiency rapid cooling dust removal structure. The high-temperature oily fumes generated during bathtub injection molding directly enter the activated carbon adsorption layer. The high temperature easily leads to a significant decrease in the activated carbon's adsorption activity, and the sticky oil mist and plastic dust in the exhaust gas easily adhere to and clog the activated carbon micropores, causing rapid activated carbon failure, high replacement frequency, and high operating costs. Secondly, traditional activated carbon is mostly fixedly installed, allowing exhaust gases to penetrate the carbon layer only once for adsorption. This results in rapid saturation of some carbon layers and long-term idleness in most activated carbon areas, leading to extremely low overall activated carbon utilization and a high risk of exhaust gas penetration exceeding standards, resulting in poor purification uniformity. Summary of the Invention

[0004] The purpose of this invention is to provide a device for purifying and treating exhaust gas from PVC injection molding processes, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a PVC injection molding exhaust gas purification device, comprising an adsorption treatment frame and an activated carbon adsorption component installed inside the adsorption treatment frame. A top plate is fixedly installed on the top of the adsorption treatment frame, and an exhaust hole is opened on the top of the top plate. A connecting plate is fixedly installed on the bottom of the adsorption treatment frame, and a protective frame is fixedly installed on the bottom of the connecting plate. A cooling and dust removal component is installed inside the protective frame, and an air inlet box is fixedly installed on the bottom of the protective frame. An air inlet pipe is connected to one side of the air inlet box, and a circular groove is opened on one side of the adsorption treatment frame.

[0006] Preferably, the activated carbon adsorption assembly includes two end rings, with an outer mesh cover and an inner mesh cover fixedly installed between the two end rings, the outer mesh cover being located outside the inner mesh cover. Activated carbon particles are filled between the outer mesh cover and the inner mesh cover. An end plate is fixedly installed on one side of one of the end rings. The outer contour dimensions of the end ring and the outer mesh cover are the same as the inner contour dimensions of the circular groove. An installation ring is rotatably and sealingly installed on the outer side of the end plate. An annular sealing strip is fixedly installed on one side of the installation ring. An annular sealing groove is formed on one side of the adsorption treatment frame, and the position of the annular sealing strip is the same as the position of the annular sealing groove. A rotating ring is fixedly installed on the outer side of the end plate. A rotating groove is formed on the inner side of the installation ring, and the rotating ring is rotatably and sealingly installed on the inner side of the rotating groove. A handle is fixedly installed on one side of the end plate.

[0007] Preferably, arc-shaped connecting blocks are fixedly installed on both sides of the adsorption treatment frame, and corrugated bonding blocks are fixedly installed at both ends of the arc-shaped connecting blocks. Bonding rollers are rotatably installed inside the corrugated bonding blocks.

[0008] Preferably, a transmission gear is rotatably mounted on one side of the adsorption treatment frame via a sealed bearing, a transmission wheel is fixedly mounted on one side of the transmission gear, and an assembly sleeve rod is fixedly mounted on the other side of the transmission gear. An assembly sleeve groove is opened inside the assembly sleeve rod, and an assembly insert rod is fixedly mounted on one side of the end plate. The outer contour of the assembly insert rod is adapted to the inner contour of the assembly sleeve groove, and the position of the assembly insert rod corresponds to the position of the assembly sleeve groove.

[0009] Preferably, an impeller rod is rotatably mounted inside the air intake box via a sealed bearing, an impeller blade is fixedly mounted on the outer side of the impeller rod, a second drive wheel is fixedly mounted on one side of the impeller rod, and a drive belt is driven to the outer side of the second drive wheel and the first drive wheel.

[0010] Preferably, four transmission gears II are mounted on one side of the adsorption treatment frame via sealed bearings, and the outer sides of the four transmission gears II mesh with the outer sides of the transmission gear I. A rotating rod is fixedly mounted on one side of each of the four transmission gears II, and a turbulence vane is fixedly mounted on the outer side of each rotating rod.

[0011] Preferably, a plurality of connecting rods are fixedly installed between the two end rings, and a plurality of partition plates are fixedly installed between the two end rings, with the two ends of the partition plates being fixedly connected to the inner side of the outer mesh cover and the outer side of the inner mesh cover, respectively.

[0012] Preferably, the cooling and dust removal assembly includes multiple venturis. The tops of the multiple venturis are fixedly installed on the inner side of the connecting plate and connected to the bottom of the adsorption treatment frame. Each of the multiple venturis has a spray nozzle installed in its throat. The bottom of each of the multiple venturis is connected to a vent hood. A diversion box is fixedly installed on the top of the vent hood. A connecting pipe connects the diversion box and the spray nozzle. A liquid guide pipe connects to the bottom of the diversion box. The end of the liquid guide pipe away from the diversion box passes through the vent hood and the air inlet box and extends to the outside of the air inlet box. A fixing plate is fixedly installed on the bottom of the vent hood. The outer side of the fixing plate is fixedly installed on the inner side of the protective frame.

[0013] Preferably, a protective shell is fixedly installed on one side of the adsorption treatment frame, the protective shell being located outside the transmission gear 2 and the transmission gear 1. A protective shell 2 is fixedly installed on one side of the protective shell 1, the protective shell 2 being located outside the transmission wheel 1, the transmission belt and the transmission wheel 2.

[0014] Preferably, a drain hole is connected to the bottom of one side of the air inlet box, and a sealing cap is threaded to the end of the drain hole away from the air inlet box. Support legs are fixedly installed at the bottom of the air inlet box. There are four support legs, and the four support legs are installed in a rectangular symmetrical arrangement at the four corners of the bottom of the adsorption treatment frame.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: by utilizing the high-speed airflow of the exhaust gas to impact the impeller assembly and generate driving force, the activated carbon adsorption component can be driven to rotate at low speed without the need for an additional motor. At the same time, the turbulence blades are driven to disturb the airflow, which greatly reduces the power consumption of the equipment and realizes energy recovery and utilization. The rotary activated carbon structure with a partitioned design allows the activated carbon particles to contact the exhaust gas evenly in different areas, which completely solves the problem of local rapid saturation and waste of most carbon material in traditional fixed activated carbon devices. It effectively improves the overall adsorption utilization rate of activated carbon, continuously ensures the purification effect of VOCs, acidic gases and particulate matter in PVC injection molding exhaust gas, and is suitable for stable operation under different exhaust gas flow conditions. In addition, it integrates multiple Venturi cooling and dust removal components, which can simultaneously complete rapid cooling of exhaust gas, dust collection, and preliminary purification of acidic gases. The pretreatment effect is excellent, which can effectively avoid the damage of high temperature and impurities to the downstream activated carbon adsorption components and extend the service life of activated carbon. At the same time, the equipment is equipped with a multi-seal structure. The annular sealing strip and the embedded sealing groove achieve precise sealing of gaps, preventing exhaust gas leakage and pollution of the workshop environment. The overall structure has a high degree of integration and good protection. The transmission components are fully enclosed and protected, not easy to be corroded or jammed, and convenient to operate and maintain, which greatly improves the overall operational stability and service life of the equipment. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the three-dimensional appearance structure of the present invention.

[0017] Figure 2 This is a three-dimensional structural schematic diagram of the present invention from another perspective.

[0018] Figure 3 This is a schematic diagram of the three-dimensional structure of the present invention with the protective shell 1 and the protective shell 2 removed.

[0019] Figure 4 This is a schematic diagram of the three-dimensional structure of the activated carbon adsorption component of the present invention.

[0020] Figure 5 This is a three-dimensional structural diagram of the cooling and dust removal component of the present invention.

[0021] Figure 6 This is a partial three-dimensional structural diagram of the present invention.

[0022] Figure 7 This is a schematic diagram of the three-dimensional structure of the activated carbon adsorption component of the present invention.

[0023] Figure 8 This is a schematic diagram of the three-dimensional structure of the activated carbon adsorption component of the present invention after an explosion.

[0024] Figure 9 This is a cross-sectional view of the activated carbon adsorption component of the present invention.

[0025] In the diagram: 1. Adsorption treatment frame; 2. Air inlet box; 3. Mounting ring; 4. End plate; 5. Top plate; 6. Exhaust port; 7. Handle; 8. Support leg; 9. Air inlet pipe; 10. Protective frame; 11. Connecting plate; 12. Drain hole; 13. Liquid guide pipe; 14. Protective shell two; 15. Protective shell one; 16. Transmission gear two; 17. Transmission wheel one; 18. Transmission gear one; 19. Transmission belt; 20. Transmission wheel two; 21. Baffle plate; 22. Rotating rod; 23. Assembly slot; 24. Ring 25. Corrugated sealing groove; 26. Corrugated bonding block; 27. Bonding roller; 28. Arc-shaped connecting block; 29. ​​Circular groove; 30. Assembly sleeve rod; 31. Venturi device; 32. Liquid sprayer; 33. Diverter box; 34. Connecting pipe; 35. Vent hood; 36. Fixing plate; 37. Inner mesh cover; 38. Outer mesh cover; 39. Assembly insert rod; 40. Annular sealing strip; 41. Impeller blade; 42. Impeller rotor; 43. Divider plate; 44. Connecting rod; 45. Rotating groove; 46. Rotating ring; 47. End ring. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Please see Figures 1-9This invention provides a technical solution: a PVC injection molding exhaust gas purification device, comprising an adsorption frame 1 and an activated carbon adsorption assembly installed inside the adsorption frame 1. A top plate 5 is fixedly installed on the top of the adsorption frame 1, and an exhaust port 6 is opened on the top of the top plate 5. A connecting plate 11 is fixedly installed on the bottom of the adsorption frame 1, and a protective frame 10 is fixedly installed on the bottom of the connecting plate 11. A cooling and dust removal assembly is installed inside the protective frame 10. An air inlet box 2 is fixedly installed on the bottom of the protective frame 10, and an air inlet pipe 9 is connected to one side of the air inlet box 2. A circular groove 28 is opened on one side of the adsorption frame 1. The activated carbon adsorption assembly includes two end rings 46, and an outer mesh cover 37 and an inner mesh cover 36 are fixedly installed between the two end rings 46. 7 is located outside the inner mesh cover 36. Activated carbon particles are filled between the outer mesh cover 37 and the inner mesh cover 36. An end plate 4 is fixedly installed on one side of one end ring 46. The outer contour dimensions of the end ring 46 and the outer mesh cover 37 are the same as the inner contour dimensions of the circular groove 28. An installation ring 3 is rotatably installed on the outer side of the end plate 4. An annular sealing strip 39 is fixedly installed on one side of the installation ring 3. An annular sealing groove 24 is opened on one side of the adsorption treatment frame 1, and the position of the annular sealing strip 39 is the same as the position of the annular sealing groove 24. A rotating ring 45 is fixedly installed on the outer side of the end plate 4. A rotating groove 44 is opened on the inner side of the installation ring 3, and the rotating ring 45 is rotatably installed on the inner side of the rotating groove 44. A handle 7 is fixedly installed on one side of the end plate 4. Arc-shaped connecting blocks 27 are fixedly installed on both sides. Corrugated bonding blocks 25 are fixedly installed at both ends of the arc-shaped connecting blocks 27. Bonding rollers 26 are rotatably installed inside each corrugated bonding block 25. A transmission gear 18 is rotatably installed on one side of the adsorption treatment frame 1 via a sealed bearing. A transmission wheel 17 is fixedly installed on one side of the transmission gear 18. An assembly sleeve rod 29 is fixedly installed on the other side of the transmission gear 18. An assembly sleeve groove 23 is opened inside the assembly sleeve rod 29. An assembly insertion rod 38 is fixedly installed on one side of the end plate 4. The outer contour dimensions of the assembly insertion rod 38 are compatible with the inner contour dimensions of the assembly sleeve groove 23, and the positions of the assembly insertion rod 38 and the assembly sleeve groove 23 correspond. An impeller is rotatably installed inside the air intake box 2 via a sealed bearing. An impeller blade 40 is fixedly installed on the outer side of the impeller rod 41. A transmission wheel 20 is fixedly installed on one side of the impeller rod 41. A transmission belt 19 is installed on the outer side of the transmission wheel 20 and the transmission wheel 17. Multiple connecting rods 43 are fixedly installed between the two end rings 46. Multiple partition plates 42 are fixedly installed between the two end rings 46. The two ends of the partition plates 42 are fixedly connected to the inner side of the outer mesh cover 37 and the outer side of the inner mesh cover 36, respectively. Four transmission gears 16 are installed on one side of the adsorption treatment frame 1 through a sealed bearing. The outer sides of the four transmission gears 16 mesh with the outer sides of the transmission gear 18. A rotating rod 22 is fixedly installed on one side of each of the four transmission gears 16. A turbulence plate 21 is fixedly installed on the outer side of each rotating rod 22.

[0028] The working principle of the above technical solution: The exhaust gas containing dust, high temperature, VOCs and acidic substances generated at the PVC injection molding station is collected through equipment pipelines and stably sent into the cavity of the air inlet box 2 through the air inlet pipe 9. Under the negative pressure of the fan, the exhaust gas forms a high-speed directional airflow. The high-speed airflow continuously impacts the impeller blade 40 in a positive direction, driving the impeller rotor 41 to rotate uniformly and continuously around the sealed bearing. The entire process relies on the kinetic energy of the exhaust gas itself to do work, without the need for an external motor drive. The impeller rotor 41 synchronously drives the outer transmission wheel 20 to rotate coaxially, and the torque is transmitted through the transmission belt 19, driving the upper transmission wheel 17 and the transmission gear 18 to rotate synchronously. Relying on the precise insertion and positioning structure of the assembly sleeve rod 29 and the assembly insert rod 38, the transmission gear 18 can stably drive the end plate 4 and the entire set of annular activated carbon adsorption components to perform low-speed rotation. At the same time, the four sets of transmission gears on the outer side of the transmission gear 18 mesh with each other. The moving gear 16 synchronously drives the rotating rods 22 and the turbulence-disrupting blades 21 to rotate, uniformly disturbing the airflow inside the adsorption treatment frame 1, breaking up airflow turbulence and dead corners, making the exhaust gas distribution more uniform, and providing good airflow conditions for subsequent stable adsorption. In addition, the arc-shaped connecting block 27 is fixed on both sides of the adsorption treatment frame 1 as an auxiliary positioning and pressure-bearing connection structure, used to stabilize the wavy bonding blocks 25 on both sides, and improve the overall structural bonding stability. The wavy bonding block 25 adopts a wavy bonding structure, which can adapt to the slight radial runout when the activated carbon component rotates, and realize flexible bonding limit. The bonding roller 26 installed inside can bond and roll with the outside of the rotary activated carbon component, greatly reducing the frictional resistance when the component rotates at low speed, avoiding rotation jamming and offset shaking, and at the same time, assisting in limiting the position, ensuring the coaxiality of the annular activated carbon component rotation, further reducing the fluctuation of the sealing gap, and eliminating exhaust gas leakage. The clean, low-temperature exhaust gas, after cooling, dust removal, and pre-acidification, penetrates upward through the connecting channel of the connecting plate 11 and smoothly enters the core adsorption area of ​​the adsorption treatment frame 1. The exhaust gas first penetrates the mesh of the outer mesh cover 37 from the outside of the annular activated carbon component and enters the annular cavity between the outer mesh cover 37 and the inner mesh cover 36 evenly, fully filling the interior of the partitioned granular activated carbon layer. During equipment operation, the entire activated carbon component rotates continuously at a low speed. With the partitioned frame structure composed of the partition plate 42 and the connecting rod 43, the activated carbon layer is divided into multiple independent adsorption areas, effectively avoiding the problems of activated carbon particles sliding, accumulating, collapsing, and airflow short-circuiting during the rotation process. The exhaust gas is fully retained and diffused inside the partitioned carbon layer. Through multi-stage contact adsorption, the residual VOCs organic waste gas, odor molecules, and trace acidic residual impurities in the exhaust gas are completely intercepted, achieving deep purification of the exhaust gas. The rotating structure allows activated carbon particles at different positions to contact the polluted airflow in turn, avoiding premature saturation of local carbon layers due to long-term high-load operation, and greatly improving the overall adsorption uniformity and effective utilization rate. Throughout the entire operation of the equipment, a multi-layer dynamic sealing structure is used to ensure airtightness. The rotating ring 45 on the outer side of the end plate 4 is sealed and embedded in the rotating groove 44 of the mounting ring 3, which can keep the rotating parts sealed at all times while the activated carbon component is rotating. At the same time, the annular sealing strip 39 is precisely engaged and embedded in the annular sealing groove 24 to form an annular closed-loop sealing barrier, effectively preventing unpurified exhaust gas from leaking from assembly gaps and rotating gaps, avoiding the overflow of waste gas and pollution of the workshop environment. The qualified clean exhaust gas after double-layer pretreatment and deep adsorption purification by activated carbon is pushed upward by the airflow and converges to the top plate 5 area, and finally is smoothly discharged to the outside through the evenly distributed exhaust holes 6.

[0029] In another implementation scheme, such as Figures 1-9 As shown, the cooling and dust removal assembly includes multiple venturis 30. The tops of the multiple venturis 30 are all fixedly installed on the inner side of the connecting plate 11 and are connected to the bottom of the adsorption treatment frame 1. Each of the multiple venturis 30 has a spray nozzle 31 installed in its throat. Each of the multiple venturis 30 has a ventilation hood 34 connected to its bottom. A diversion box 32 is fixedly installed on the top of the ventilation hood 34. A connecting pipe 33 connects the diversion box 32 and the spray nozzle 31. A liquid guide pipe 13 is connected to the bottom of the diversion box 32. The end of the liquid guide pipe 13 away from the diversion box 32 passes through the ventilation hood 34 and the air inlet box 2 and extends to the outside of the air inlet box 2. A fixing plate 35 is fixedly installed on the bottom of the ventilation hood 34. The outside of the fixing plate 35 is fixedly installed on the inner side of the protective frame 10.

[0030] The collected exhaust gas smoothly enters the internal cavity of the protective frame 10 under the action of air pressure difference, and is evenly distributed into the interior of multiple sets of parallel Venturi 30s. The externally configured washing solution is introduced into the diversion box 32 through the liquid guide pipe 13 to complete the uniform liquid distribution, and then accurately delivered to the corresponding sprayer 31 through multiple sets of connecting pipes 33. The sprayer 31 atomizes the washing solution into micron-sized droplets in the high-speed negative pressure zone of the throat of the Venturi 30. When the exhaust gas passes through the throat, the flow rate increases sharply, and it is fully and vigorously mixed and contacted with the atomized solution. The heat of the exhaust gas is quickly absorbed by the evaporation heat absorption principle of water, which quickly cools down the high-temperature injection molding exhaust gas of PVC, and prevents the high-temperature airflow from burning the activated carbon material at the back end. At the same time, the atomized droplets can efficiently capture plastic dust and smoke particles in the exhaust gas, and achieve dust settling through wetting and agglomeration. It can also initially neutralize acidic harmful gases such as hydrogen chloride in the exhaust gas, which significantly reduces the pollutant load of the back end adsorption unit. The mixed waste liquid after washing settles freely under the action of gravity and collects at the bottom of the air inlet box 2.

[0031] In another implementation scheme, such as Figures 1-9As shown, a protective shell 15 is fixedly installed on one side of the adsorption treatment frame 1. The protective shell 15 is located outside the transmission gear 16 and transmission gear 18. A protective shell 14 is fixedly installed on one side of the protective shell 15. The protective shell 14 is located outside the transmission wheel 17, transmission belt 19 and transmission wheel 20. A drain hole 12 is connected to the bottom of one side of the air inlet box 2. A sealing cap is threaded to the end of the drain hole 12 away from the air inlet box 2. A support leg 8 is fixedly installed at the bottom of the air inlet box 2. There are four support legs 8, and the four support legs 8 are installed in a rectangular symmetrical arrangement at the four corners of the bottom of the adsorption treatment frame 1.

[0032] Protective shell 15 and protective shell 2 14 completely enclose all gears, transmission wheels, transmission belts and other transmission components, isolating them from corrosive exhaust gas, dust and water vapor, preventing transmission components from rusting, jamming and failure, ensuring long-term continuous, stable and low-failure operation of the entire equipment, and allowing the drain hole 12 to be opened periodically for sewage discharge, so as to achieve continuous and stable pretreatment operation.

[0033] Working Principle: The exhaust gas containing dust, high temperature, VOCs, and acidic substances generated at the PVC injection molding station is collected through equipment pipelines and stably sent into the air inlet chamber 2 through the air inlet pipe 9. Under the negative pressure of the fan, the exhaust gas forms a high-speed directional airflow. The high-speed airflow continuously impacts the impeller blade 40, driving the impeller rotor 41 to rotate uniformly and continuously around the sealed bearing. The entire process relies on the kinetic energy of the exhaust gas itself to do work, without the need for an external motor drive. The impeller rotor 41 synchronously drives the outer transmission wheel 20 to rotate coaxially, and the torque is transmitted through the transmission belt 19, driving... The upper drive wheel 17 and drive gear 18 rotate synchronously. Relying on the precise insertion and positioning structure of the assembly sleeve rod 29 and assembly insert rod 38, the drive gear 18 can stably drive the end plate 4 and the entire ring activated carbon adsorption assembly to make low-speed rotation. At the same time, the four sets of drive gears 16 mesh on the outside of the drive gear 18, synchronously driving each set of rotating rods 22 and turbulence blades 21 to rotate, uniformly disturbing the airflow inside the adsorption treatment frame 1, breaking up airflow turbulence and dead corners, making the exhaust gas distribution more uniform, and providing good airflow conditions for subsequent stable adsorption. The collected exhaust gas, under the influence of pressure difference, smoothly enters the internal cavity of the protective frame 10 and is evenly distributed into multiple sets of parallel-arranged venturis 30s. The externally prepared washing solution is introduced into the distribution box 32 through the liquid guide tube 13 to complete the uniform distribution, and then precisely delivered to the corresponding sprayer 31 through multiple sets of connecting pipes 33. The sprayer 31 atomizes the washing solution into micron-sized droplets in the high-speed negative pressure zone of the venturi throat 30. When the exhaust gas passes through the throat, the flow velocity increases sharply, and it mixes and contacts the atomized solution thoroughly and vigorously, utilizing the heat absorption of water evaporation. The system rapidly absorbs heat from the exhaust gas, quickly cooling the high-temperature PVC injection molding exhaust gas and preventing the high-temperature airflow from burning the activated carbon material at the back end. At the same time, the atomized droplets can efficiently capture plastic dust and smoke particles in the exhaust gas, achieving dust settling through wetting and agglomeration. It can also initially neutralize acidic harmful gases such as hydrogen chloride in the exhaust gas, significantly reducing the pollutant load of the back end adsorption unit. The mixed waste liquid after washing settles freely under gravity and collects at the bottom of the air inlet box 2. The sealing cap of the drain hole 12 can be opened periodically to discharge sewage, achieving continuous and stable pretreatment operation. The clean, low-temperature exhaust gas, after cooling, dust removal, and pre-acidification, penetrates upward through the connecting channel of the connecting plate 11 and smoothly enters the core adsorption area of ​​the adsorption treatment frame 1. The exhaust gas first penetrates the mesh of the outer mesh cover 37 from the outside of the annular activated carbon component and enters the annular cavity between the outer mesh cover 37 and the inner mesh cover 36 evenly, fully filling the interior of the partitioned granular activated carbon layer. During equipment operation, the entire activated carbon component rotates continuously at a low speed. With the partitioned frame structure composed of the partition plate 42 and the connecting rod 43, the activated carbon layer is divided into multiple independent adsorption areas, effectively avoiding the problems of activated carbon particles sliding, accumulating, collapsing, and airflow short-circuiting during the rotation process. The exhaust gas is fully retained and diffused inside the partitioned carbon layer. Through multi-stage contact adsorption, the residual VOCs organic waste gas, odor molecules, and trace acidic residual impurities in the exhaust gas are completely intercepted, achieving deep purification of the exhaust gas. The rotating structure allows activated carbon particles at different positions to contact the polluted airflow in turn, avoiding premature saturation of local carbon layers due to long-term high-load operation, and greatly improving the overall adsorption uniformity and effective utilization rate. Throughout the entire operation of the equipment, a multi-layer dynamic sealing structure ensures airtightness. The rotating ring 45 on the outer side of the end plate 4 is sealed and embedded inside the rotating groove 44 of the mounting ring 3, maintaining the seal of the rotating parts even when the activated carbon components are rotating. At the same time, the annular sealing strip 39 is precisely engaged and embedded inside the annular sealing groove 24, forming a closed-loop sealing barrier that effectively prevents unpurified exhaust gas from leaking from assembly gaps and rotating gaps, avoiding waste gas overflow and pollution of the workshop environment. After double-layer pretreatment and deep adsorption purification by activated carbon, the qualified clean exhaust gas is continuously pushed upwards by the airflow and converges to the top plate 5 area, and finally is smoothly discharged outwards through the evenly distributed exhaust holes 6. In addition, the protective shell 15 and the protective shell 2 14 completely enclose and wrap all gears, transmission wheels, transmission belts and other transmission components, isolating them. Corrosive exhaust gases, dust, and water vapor erosion prevent transmission components from rusting, jamming, and failing, ensuring long-term continuous, stable, and low-failure operation of the entire equipment. In addition, the arc-shaped connecting block 27 is fixed on both sides of the adsorption treatment frame 1 as an auxiliary positioning and pressure-bearing connection structure, used to stabilize the corrugated bonding blocks 25 on both sides of the assembly, improving the overall structural bonding stability. The corrugated bonding block 25 adopts a corrugated bonding structure, which can adapt to the slight radial runout when the activated carbon component rotates, achieving flexible bonding and limiting. The bonding roller 26 installed inside can roll and bond with the outer side of the rotary activated carbon component, greatly reducing the frictional resistance when the component rotates at low speed, avoiding rotation jamming and offset shaking, while also providing auxiliary limiting, ensuring the coaxiality of the annular activated carbon component rotation, further reducing the fluctuation of the sealing gap, and eliminating exhaust gas leakage.

[0034] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for purifying exhaust gas from PVC injection molding processing, comprising an adsorption treatment frame (1) and an activated carbon adsorption assembly installed inside the adsorption treatment frame (1), characterized in that: The top of the adsorption treatment frame (1) is fixedly installed with a top plate (5), and the top of the top plate (5) is provided with an exhaust hole (6). The bottom of the adsorption treatment frame (1) is fixedly installed with a connecting plate (11), and the bottom of the connecting plate (11) is fixedly installed with a protective frame (10). The interior of the protective frame (10) is equipped with a cooling and dust removal component. The bottom of the protective frame (10) is fixedly installed with an air inlet box (2). One side of the air inlet box (2) is connected to an air inlet pipe (9). A circular groove (28) is provided on one side of the adsorption treatment frame (1).

2. The PVC injection molding exhaust gas purification device according to claim 1, characterized in that: The activated carbon adsorption assembly includes two end rings (46), with an outer mesh cover (37) and an inner mesh cover (36) fixedly installed between the two end rings (46), and the outer mesh cover (37) located outside the inner mesh cover (36). Activated carbon particles are filled between the outer mesh cover (37) and the inner mesh cover (36). An end plate (4) is fixedly installed on one side of one of the end rings (46). The outer contour dimensions of the end rings (46) and the outer mesh cover (37) are the same as the inner contour dimensions of the circular groove (28). The outer side of the end plate (4) is sealed. An installation ring (3) is installed on one side of the installation ring (3). An annular sealing strip (39) is fixedly installed on one side of the adsorption treatment frame (1). An annular sealing groove (24) is opened on one side of the frame. The position of the annular sealing strip (39) is the same as the position of the annular sealing groove (24). A rotating ring (45) is fixedly installed on the outer side of the end plate (4). A rotating groove (44) is opened on the inner side of the installation ring (3). The rotating ring (45) is sealed and rotated on the inner side of the rotating groove (44). A handle (7) is fixedly installed on one side of the end plate (4).

3. The PVC injection molding exhaust gas purification device according to claim 2, characterized in that: Both sides of the adsorption treatment frame (1) are fixedly installed with arc-shaped connecting blocks (27), and both ends of the arc-shaped connecting blocks (27) are fixedly installed with wave-shaped bonding blocks (25). The inside of the wave-shaped bonding blocks (25) is rotatably installed with bonding rollers (26).

4. The PVC injection molding exhaust gas purification device according to claim 3, characterized in that: One side of the adsorption treatment frame (1) is rotatably mounted with a transmission gear (18) via a sealed bearing. One side of the transmission gear (18) is fixedly mounted with a transmission wheel (17). The other side of the transmission gear (18) is fixedly mounted with an assembly sleeve rod (29). An assembly sleeve groove (23) is opened inside the assembly sleeve rod (29). An assembly insert rod (38) is fixedly mounted on one side of the end plate (4). The outer contour of the assembly insert rod (38) is adapted to the inner contour of the assembly sleeve groove (23), and the position of the assembly insert rod (38) corresponds to the position of the assembly sleeve groove (23).

5. The PVC injection molding exhaust gas purification device according to claim 4, characterized in that: Inside the air intake box (2), an impeller rod (41) is rotatably mounted via a sealed bearing. An impeller blade (40) is fixedly mounted on the outside of the impeller rod (41). A transmission wheel two (20) is fixedly mounted on one side of the impeller rod (41). A transmission belt (19) is driven on the outside of the transmission wheel two (20) and the transmission wheel one (17).

6. The PVC injection molding exhaust gas purification device according to claim 5, characterized in that: Four transmission gears (16) are installed on one side of the adsorption treatment frame (1) via a sealed bearing, and the outer sides of the four transmission gears (16) mesh with the outer side of the transmission gear (18). A rotating rod (22) is fixedly installed on one side of each of the four transmission gears (16), and a turbulence plate (21) is fixedly installed on the outer side of each rotating rod (22).

7. The PVC injection molding exhaust gas purification device according to claim 6, characterized in that: Multiple connecting rods (43) are fixedly installed between the two end rings (46), and multiple partition plates (42) are fixedly installed between the two end rings (46), with the two ends of the partition plates (42) respectively fixedly connected to the inner side of the outer mesh cover (37) and the outer side of the inner mesh cover (36).

8. The PVC injection molding exhaust gas purification device according to claim 7, characterized in that: The cooling and dust removal assembly includes multiple venturis (30), the tops of which are fixedly installed on the inner side of the connecting plate (11) and connected to the bottom of the adsorption treatment frame (1). Each venturi (30) has a sprayer (31) installed on its throat. Each venturi (30) has a ventilation hood (34) connected to its bottom. A diversion box (32) is fixedly installed on the top of the ventilation hood (34). A connecting pipe (33) connects the diversion box (32) and the sprayer (31). A liquid guide pipe (13) is connected to the bottom of the diversion box (32). The end of the liquid guide pipe (13) away from the diversion box (32) passes through the vent hood (34) and the air inlet box (2) and extends to the outside of the air inlet box (2). A fixing plate (35) is fixedly installed at the bottom of the vent hood (34). The outside of the fixing plate (35) is fixedly installed on the inside of the protective frame (10).

9. The PVC injection molding exhaust gas purification device according to claim 8, characterized in that: A protective shell (15) is fixedly installed on one side of the adsorption treatment frame (1). The protective shell (15) is located outside the transmission gear (16) and the transmission gear (18). A protective shell (14) is fixedly installed on one side of the protective shell (15). The protective shell (14) is located outside the transmission wheel (17), the transmission belt (19), and the transmission wheel (20).

10. A PVC injection molding exhaust gas purification device according to claim 9, characterized in that: The bottom of one side of the air inlet box (2) is connected to a drain hole (12), and the end of the drain hole (12) away from the air inlet box (2) is threaded with a sealing cap. The bottom of the air inlet box (2) is fixedly installed with support legs (8). There are four support legs (8), and the four support legs (8) are installed in a rectangular symmetrical arrangement at the four corners of the bottom of the adsorption treatment frame (1).

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