Large-air-volume low-concentration spraying waste gas treatment device

Abstract

The invention belongs to the technical field of efficient activated carbon waste gas treatment, and particularly relates to a large-air-volume low-concentration spraying waste gas treatment device which comprises a purification machine box. A flow guide box is fixedly connected to the inner wall of the purifier box, a horn mouth is formed in one end of the flow guide box, and an activated carbon layer is arranged in the inner wall of the flow guide box; a fixing frame is fixedly connected to the end, away from the horn mouth, of the flow guide box; a filter screen plate is inserted into the fixing frame; an activated carbon plate is fixedly connected to the filter screen plate; an air draft assembly is arranged at one end of the purifying machine box, and the air draft assembly is used for exhausting air into the purifying machine box; spraying waste gas which is large in air volume and low in concentration is introduced into the purifying machine box through the air draft assembly, and the waste gas is preliminarily adsorbed through a common activated carbon layer till the waste gas reaches a filter screen plate on a fixing frame and is filtered and discharged through an efficient activated carbon plate. The pretreatment and purification effects on large-air-volume low-concentration spraying waste gas can be effectively improved.

Description

Technical Field

[0001] This invention belongs to the field of high-efficiency activated carbon waste gas treatment technology, specifically a large-volume, low-concentration spraying waste gas treatment device. Background Technology

[0002] Automotive painting is a key process in automobile manufacturing where paint is atomized by a spray gun and evenly applied to the surface of the car body. It typically involves multiple layers of coating, including primer, color paint, and clear coat, and is carried out in continuous operating environments such as paint booths, leveling rooms, and drying rooms. To ensure coating quality and operational safety, a large air exchange volume is required to maintain a dust-free, temperature- and humidity-controlled workshop environment, which generates a considerable amount of exhaust gas.

[0003] For this type of spraying exhaust gas with large volume and low concentration, high-efficiency activated carbon is a honeycomb porous adsorbent material made from coal and wood powder as raw materials and modified by flame retardant and hydrophobic treatment. It has the characteristics of large specific surface area and low wind resistance, and can adsorb volatile organic compounds in large volume exhaust gas.

[0004] In traditional automotive painting workshops, exhaust gas treatment devices are essential to ensure suitable air quality. These devices typically use high-efficiency activated carbon plates to filter harmful substances in the exhaust gas. High-efficiency activated carbon plates, with their porous structure and strong adsorption capacity, can effectively adsorb paint mist and volatile organic compounds. However, in practical applications, large volumes of low-concentration painting exhaust gas often enter the high-efficiency activated carbon plate area directly without any pretreatment. This can easily affect the adsorption effect and service life of the high-efficiency activated carbon. Since the exhaust gas has not undergone preliminary purification, direct contact with the high-efficiency activated carbon will result in a large amount of dust and small particulate matter covering the surface of the activated carbon, thereby weakening the adsorption capacity of the activated carbon.

[0005] Therefore, the present invention provides a large-volume, low-concentration spraying exhaust gas treatment device. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical solution adopted by the present invention to solve its technical problem is as follows: The present invention provides a large-volume, low-concentration spraying exhaust gas treatment device, comprising a purification chamber; a flow guide box is fixedly connected to the inner wall of the purification chamber, one end of the flow guide box is configured as a flared opening, and an activated carbon layer is built into the inner wall of the flow guide box; a fixing frame is fixedly connected to the end of the flow guide box away from the flared opening; a filter plate is inserted into the fixing frame; an activated carbon plate is fixedly connected to the filter plate; and an exhaust assembly is provided at one end of the purification chamber for drawing air into the interior of the purification chamber.

[0008] Preferably, two connecting plates are fixedly connected to the filter screen plate; two fixing blocks are fixedly connected to the fixing frame, and the connecting plates are inserted into the inner wall of the fixing blocks; a connecting frame is slidably connected to the fixing frame; two trapezoidal blocks are fixedly connected to the connecting frame, and the trapezoidal blocks are slidably connected to the fixing blocks.

[0009] Preferably, a spraying box is provided at one end of the purification unit; the exhaust assembly includes a sealing plate, a fan frame, a servo motor, exhaust fan blades, and folding curtains; the sealing plate is slidably connected to the spraying box via an electric slider, and two sets of purification units are installed on the purification unit; the fan frame is fixedly connected to the sealing plate; the servo motor is fixedly connected to the fan frame; multiple exhaust fan blades are fixedly connected to the output end of the servo motor; two folding curtains are fixedly connected to both sides of the sealing plate, and the folding curtains are fixedly connected to the inner wall of the purification unit.

[0010] Preferably, a first sleeve is fixedly connected to the inner wall of the flow guide box; a first spiral blade is fixedly connected to the inner wall of the first sleeve; a second sleeve is fixedly connected to the first spiral blade; a second spiral blade is fixedly connected to the inner wall of the second sleeve; and a fixing rod is fixedly connected to the second spiral blade.

[0011] Preferably, both the first and second helical blades are provided with multiple flow holes, and the flow holes are provided at an angle.

[0012] Preferably, a separation plate is fixed to the outside of the first sleeve. The separation plate is composed of multiple thin plates of different widths and is set in an inclined and curved shape.

[0013] Preferably, a filter frame is fixedly connected to the side of the sealing plate away from the purification chamber; a filter screen is fixedly connected to the inner wall of the filter frame.

[0014] Preferably, a connecting rod is fixedly connected to the output end of the servo motor; a scraper is fixedly connected to the connecting rod; and a scraper blade is fixedly connected to the scraper.

[0015] Preferably, the scraper has a flow cavity inside; a collection cylinder is connected to the scraper by bolts and threads, and the collection cylinder is connected to the flow cavity.

[0016] Preferably, a sliding blade is slidably connected to the scraper plate, a counterweight is fixed to the sliding blade, and the sliding blade is in contact with the surface of the scraper blade.

[0017] The beneficial effects of this invention are as follows: 1. The present invention discloses a high-volume, low-concentration spray painting exhaust gas treatment device. High-volume, low-concentration spray painting exhaust gas is introduced into the purification chamber by an exhaust assembly. A common activated carbon layer initially adsorbs the exhaust gas until it reaches the filter plate on the fixed frame, where it is filtered and discharged by a high-efficiency activated carbon plate. This device, through this multi-stage filtration structure, effectively improves the pretreatment and purification effect of high-volume, low-concentration spray painting exhaust gas. The funnel-shaped flow guide box not only increases the contact area for the exhaust gas but also acts as a buffer and guide, allowing the exhaust gas to be evenly distributed on the activated carbon layer, improving the adsorption effect. The funnel-shaped opening of the flow guide box presents a gradually narrowing channel, which can effectively guide the high-volume exhaust gas... The low-concentration spraying exhaust gas is transformed into high-concentration and rapidly flowing exhaust gas. This transformation facilitates the adsorption of pollutants in the exhaust gas by the subsequent activated carbon layer and activated carbon plate, making the adsorption process more thorough and efficient. The filter screen plate inserted into the fixed frame serves as a supporting structure, stably supporting the high-efficiency activated carbon plate, ensuring that the exhaust gas is fully filtered and purified as it passes through. When the activated carbon plate needs to be replaced, it can be quickly removed and replaced by releasing the fixing of the filter screen plate, facilitating rapid replacement of the activated carbon plate. The exhaust component serves as the power source of the entire device, and its stable air extraction capacity ensures that the exhaust gas can be continuously and stably introduced into the exhaust gas treatment device, thereby achieving an efficient and continuous exhaust gas treatment process.

[0018] 2. The large-volume, low-concentration spray painting exhaust gas treatment device of the present invention introduces large-volume, low-concentration spray painting exhaust gas into the funnel-shaped opening of the guide box. The converted high-concentration, rapidly flowing exhaust gas is then diverted. Part of the exhaust gas flows through the four-corner channel formed by the first sleeve and the inner wall of the guide box, and is pre-treated and filtered by the activated carbon layer on the inner wall of the guide box. Part of the exhaust gas is spirally conveyed through the first spiral blade between the first and second sleeves, and another part is spirally conveyed through the second spiral blade between the second sleeve and the fixed rod. The exhaust gas then passes through the paint funnel at the funnel opening. The exhaust gas is accelerated and then transported through two spiral channels. The denser paint mist particles are thrown against the wall, which collects the paint mist particles contained in the exhaust gas. This effectively reduces the clogging and pollution of the high-efficiency activated carbon plates by the paint mist particles, extends the service life of the activated carbon plates, and reduces the maintenance cost and replacement frequency of the exhaust gas treatment device. At the same time, this multi-channel spiral conveying design also increases the flow path and residence time of the exhaust gas in the guide box, allowing the pollutants in the exhaust gas to come into more complete contact with and be adsorbed, further improving the effect of exhaust gas pretreatment. Attached Figure Description

[0019] The invention will now be further described with reference to the accompanying drawings.

[0020] Figure 1 This is a perspective view of the present invention; Figure 2 This is a schematic diagram of the sealing plate in this invention; Figure 3 This is a schematic diagram of the separation plate in this invention; Figure 4 This is a schematic diagram of the flow guide box in this invention; Figure 5 This is a schematic diagram of the structure of the first sleeve in this invention; Figure 6 This is a schematic diagram of the flow hole structure in this invention; Figure 7 This is a schematic diagram of the structure of the scraper plate in this invention.

[0021] In the diagram: 1. Purification unit housing; 11. Flow guide box; 12. Fixing frame; 13. Filter screen plate; 14. Activated carbon plate; 2. Connecting plate; 21. Fixing block; 22. Connecting frame; 23. Trapezoidal block; 3. Sealing plate; 31. Fan frame; 32. Servo motor; 33. Exhaust fan blade; 34. Folding curtain; 35. Spraying box; 4. No. 1 sleeve; 41. No. 1 spiral blade; 42. No. 2 sleeve; 43. No. 2 spiral blade; 44. Fixing rod; 5. Flow hole; 6. Separation plate; 7. Filter screen frame; 71. Filter screen; 8. Connecting rod; 81. Scraper plate; 82. Scraper; 9. Collection cylinder; 91. Sliding blade. Detailed Implementation

[0022] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0023] like Figures 1 to 4As shown in the embodiment of the present invention, a high-volume, low-concentration spray painting exhaust gas treatment device includes a purification chamber 1; a guide box 11 is fixedly connected to the inner wall of the purification chamber 1, one end of the guide box 11 is configured as a funnel opening, and an activated carbon layer is built into the inner wall of the guide box 11; a fixing frame 12 is fixedly connected to the end of the guide box 11 away from the funnel opening; a filter plate 13 is inserted into the fixing frame 12; an activated carbon plate 14 is fixedly connected to the filter plate 13; an exhaust assembly is provided at one end of the purification chamber 1, which is used to draw air into the interior of the purification chamber 1; when treating the exhaust gas generated in the automotive painting workshop, the high-volume, low-concentration spray painting exhaust gas is introduced into the interior of the purification chamber 1 by the exhaust assembly, and then a large amount of exhaust gas passes through the funnel opening of the guide box 11 to reach the ordinary activated carbon layer, and the exhaust gas in the guide box 1... During the internal flow process, the waste gas is initially adsorbed by the ordinary activated carbon layer until it reaches the filter plate 13 on the fixed frame 12, where it is filtered and discharged by the high-efficiency activated carbon plate 14. The core of the high-efficiency activated carbon plate 14 is high-efficiency activated carbon, which is a high-performance adsorption material made from high-quality coal or wood raw materials through physical or chemical activation treatment. It is usually processed into honeycomb or porous granular form, with extremely high specific surface area and rich microporous structure, which can efficiently capture volatile organic compounds in waste gas. It is often optimized through hydrophobic modification and flame retardant impregnation processes to cope with high humidity environment and reduce the risk of spontaneous combustion. It has the characteristics of fast adsorption speed, low wind resistance and strong treatment capacity. Through this multi-stage filtration structure, the device can effectively improve the pretreatment and purification effect of large volume and low concentration spraying waste gas. The funnel-shaped flow guide box 11 not only increases the contact area for the incoming exhaust gas, but also acts as a buffer and guide, allowing the exhaust gas to be evenly distributed on the activated carbon layer, thus improving the adsorption effect. The funnel-shaped flow guide box 11 has a gradually narrowing channel, which can convert the large volume of low-concentration spraying exhaust gas into high-concentration and fast-flowing exhaust gas. This conversion is beneficial to the subsequent adsorption of pollutants in the exhaust gas by the activated carbon layer and activated carbon plate 14, making the adsorption process more complete and efficient. The filter screen plate 13 inserted into the fixed frame 12 serves as a support structure, firmly supporting the high-efficiency activated carbon plate 14, ensuring that the exhaust gas can be fully filtered and purified when passing through. When the activated carbon plate 14 needs to be replaced, the filter screen plate 13 can be quickly removed and replaced, facilitating the rapid replacement of the activated carbon plate 14. The exhaust assembly serves as the power source of the entire device, and its stable exhaust capacity ensures that the exhaust gas can be continuously and stably introduced into the exhaust gas treatment device, thereby achieving an efficient and continuous exhaust gas treatment process.

[0024] like Figures 1 to 5As shown, two connecting plates 2 are fixedly attached to the filter plate 13; two fixing blocks 21 are fixedly attached to the fixing frame 12, and the connecting plates 2 are inserted into the inner wall of the fixing blocks 21; a connecting frame 22 is slidably connected to the fixing frame 12; two trapezoidal blocks 23 are fixedly attached to the connecting frame 22, and the trapezoidal blocks 23 are slidably connected to the fixing blocks 21; when pre-treating and replacing the activated carbon plate 14 after long-term filtration before work, the operator first holds the connecting frame 22 and slides it upwards, and the connecting frame 22 simultaneously drives the two trapezoidal blocks 23 to slide upwards. At this time, the two trapezoidal blocks 23 release the restriction on the two connecting plates 2, and then pull the two connecting plates 2 out from the two fixing blocks 21. The filter plate 13 and the activated carbon plate 14 are also pulled out from the fixing frame 12. Then, the operator can easily remove the blockage. The activated carbon plate 14 is removed from the filter screen plate 13 and replaced with a new high-efficiency activated carbon plate 14. After the replacement, the operator holds the filter screen plate 13 and inserts it back into the fixing frame 12. The two connecting plates 2 are also inserted into the inner walls of the two fixing blocks 21. The two connecting plates 2 press against the inclined surfaces of the two trapezoidal blocks 23, causing them to slide upward synchronously with the connecting frame 22 until the two connecting plates 2 pass over the two trapezoidal blocks 23. Then, the two trapezoidal blocks 23 slide down and limit the two connecting plates 2 within the two fixing blocks 21, ensuring that the filter screen plate 13 and the new activated carbon plate 14 are securely installed in the fixing frame 12. This design makes the operation process simple and quick when the pretreatment to replace the clogged activated carbon plate 14 is required, shortens the equipment downtime, and improves the operating efficiency of the waste gas treatment device.

[0025] like Figures 1 to 4 , Figure 7As shown, a spraying box 35 is provided at one end of the purification chamber 1; the exhaust assembly includes a sealing plate 3, a fan frame 31, a servo motor 32, exhaust fan blades 33, and folding curtains 34; the sealing plate 3 is slidably connected to the spraying box 35 via an electric slider, and two sets of purification chambers 1 are installed on the purification chamber 1; the fan frame 31 is fixedly connected to the sealing plate 3; the servo motor 32 is fixedly connected to the fan frame 31; multiple exhaust fan blades 33 are fixedly connected to the output end of the servo motor 32; two folding curtains 34 are fixedly connected to both sides of the sealing plate 3, and the folding curtains 34 are fixedly connected to the inner wall of the purification chamber 1; when spraying paint on automobiles... Vehicles can be driven into the spray box 35 for spraying, making it easy to collect the exhaust gas generated during car painting. Then, the electric slider moves the sealing plate 3 to the front of a purification box 1, allowing the exhaust assembly to connect with it. The inner wall of the purification box 1 is connected to both ends of the sealing plate 3 via two folding curtains 34. One folding curtain 34 unfolds to seal the other unconnected purification box 1. The output of the servo motor 32 on the fan frame 31 rotates, driving multiple exhaust fan blades 33 to agitate and extract the large volume of low-concentration spraying exhaust gas generated in the spray box 35, drawing the large volume of low-concentration spraying exhaust gas into the guide box 11. The waste gas is converted into high-concentration, rapidly flowing exhaust gas. After initial adsorption by the activated carbon layer, it undergoes further filtration by the high-efficiency activated carbon plate 14 fixed to the filter screen 13, ensuring that the emitted waste gas meets environmental standards. When the activated carbon plate 14 on one of the purification chambers 1 becomes clogged and needs replacement, the electric slider can move the sealing plate 3 to another purification chamber 1 for docking, switching the waste gas treatment channel. This allows for non-stop maintenance or short-term shutdown switching, depending on the specific site conditions. During short-term shutdown switching, staff can use this time to clean the clogged activated carbon plate 14. 4. Quick replacement is possible, as the entire replacement process is simple and fast, without significantly delaying the overall operation of the exhaust gas treatment device. Moreover, this switchable channel design greatly improves the flexibility and practicality of the exhaust gas treatment device, allowing for flexible adjustments based on actual production needs and equipment maintenance conditions, ensuring the continuous and efficient operation of exhaust gas treatment in the automotive painting workshop. At the same time, the design of the folding curtain 34 not only provides a stable connection when the exhaust component is connected to the purification box 1, but also effectively seals off any disconnected purification box 1 when switching channels, reducing exhaust gas leakage and ensuring the safety and environmental friendliness of the exhaust gas treatment process.

[0026] like Figures 1 to 6As shown, a first sleeve 4 is fixedly connected to the inner wall of the flow guide box 11; a first spiral blade 41 is fixedly connected to the inner wall of the first sleeve 4; a second sleeve 42 is fixedly connected to the first spiral blade 41; a second spiral blade 43 is fixedly connected to the inner wall of the second sleeve 42; and a fixing rod 44 is fixedly connected to the second spiral blade 43. When a large volume of low-concentration spraying exhaust gas is introduced into the funnel-shaped opening of the flow guide box 11, the converted high-concentration and rapidly flowing exhaust gas is diverted. Part of the exhaust gas flows through the four-corner channel formed by the first sleeve 4 and the inner wall of the flow guide box 11, and is pre-treated and filtered by the activated carbon layer on the inner wall of the flow guide box 11. Part of the exhaust gas passes through the spiral blade 41 between the first sleeve 4 and the second sleeve 42. In addition to the conveying process, some of the exhaust gas is conveyed through the spiral blades 43 between the second sleeve 42 and the fixed rod 44. The paint mist exhaust gas passing through the flared mouth is accelerated and then conveyed through two spiral channels. The denser paint mist particles are thrown against the wall, which can collect the paint mist particles contained in the exhaust gas. This effectively reduces the clogging and pollution of the high-efficiency activated carbon plate 14 by the paint mist particles, extends the service life of the activated carbon plate 14, and reduces the maintenance cost and replacement frequency of the exhaust gas treatment device. At the same time, this multi-channel spiral conveying design also increases the flow path and residence time of the exhaust gas in the guide box 11, so that the pollutants in the exhaust gas can be more fully contacted and adsorbed, further improving the effect of exhaust gas pretreatment.

[0027] Both the first spiral blade 41 and the second spiral blade 43 are provided with multiple flow holes 5, and the flow holes 5 are set at an angle. When the exhaust gas is introduced into the first spiral blade 41 and the second spiral blade 43 for spiral flow, the multiple angled flow holes 5 are evenly distributed on the first spiral blade 41 and the second spiral blade 43, so that some exhaust gas can flow through multiple flow holes 5, reducing the situation of excessive exhaust gas pressure in the spiral channel caused by poor exhaust gas flow, and avoiding the problem of reduced exhaust gas treatment efficiency due to uneven pressure. At the same time, these angled flow holes 5 can also play a certain guiding role, so that the exhaust gas flows more smoothly in the spiral channel, further optimizing the exhaust gas pretreatment process.

[0028] A separation plate 6 is fixedly connected to the outside of the first sleeve 4. The separation plate 6 is composed of multiple thin plates of different widths and is set in an inclined and curved shape. When some exhaust gas enters the four-corner channel formed by the first sleeve 4 and the inner wall of the guide box 11, multiple thin plates of different widths are assembled in the four-corner channel, and each separation plate 6 is set in an inclined and curved shape. This allows the exhaust gas to adsorb more paint mist particles after passing through the thin plates. The inclined and curved design of the thin plates can increase the contact area and contact time between the exhaust gas and the thin plates, thereby more effectively capturing and adsorbing paint mist particles, and further reducing the clogging and pollution of the subsequent high-efficiency activated carbon plate 14 by paint mist particles. This design not only improves the effect of exhaust gas pretreatment, but also enhances the stability and durability of the entire exhaust gas treatment device.

[0029] like Figure 1 and Figure 2 As shown, a filter frame 7 is fixedly connected to the side of the sealing plate 3 away from the purification chamber 1; a filter screen 71 is fixedly connected to the inner wall of the filter frame 7; when multiple exhaust fan blades 33 rotate to draw in a large volume of low-concentration spraying exhaust gas, the filter frame 7 is fixed to the sealing plate 3 as a support for the filter screen 71. The filter screen 71 can perform the initial pre-treatment filtration of impurities in the large volume of low-concentration spraying exhaust gas, intercepting larger particles of impurities in the exhaust gas on the filter screen 71, preventing these impurities from entering the subsequent exhaust gas treatment channel and causing unnecessary blockage and damage to the activated carbon layer and the high-efficiency activated carbon plate 14. This extends the service life of key filter components in the entire exhaust gas treatment device, reduces the cost of frequent maintenance and replacement of parts due to impurity blockage, and improves the overall operational stability and economy of the exhaust gas treatment device. Moreover, the pre-treatment filtration of the filter screen 71 can also reduce the filtration burden of subsequent filter components, making the entire exhaust gas treatment process more efficient and smooth, and ensuring that the treated exhaust gas can better meet environmental emission standards.

[0030] like Figure 1 , Figure 2 and Figure 7As shown, a connecting rod 8 is fixedly connected to the output end of the servo motor 32; a scraper plate 81 is fixedly connected to the connecting rod 8; and a scraper blade 82 is fixedly connected to the scraper plate 81. When a large amount of impurities are filtered onto the filter screen 71, as the output end of the servo motor 32 drives the connecting rod 8 to rotate, the scraper plate 81 also rotates. The scraper blade 82, located at the front end of the scraper plate 81, scrapes against the surface of the filter screen 71, effectively cleaning the impurities accumulated on the filter screen 71 in a timely manner. This reduces the impact of impurities accumulating on the filter screen 71 for a long time, thus preventing them from affecting its filtration effect or even causing the filter screen 71 to become clogged and affecting the normal operation of the entire exhaust assembly. Moreover, the scraping action of the scraper blade 82 is continuous and stable, ensuring that the surface of the filter screen 71 remains relatively clean, further extending the service life of the filter screen 71, improving the automation level and operating efficiency of the exhaust gas treatment device, and making the entire exhaust gas treatment process more efficient and stable.

[0031] The scraper plate 81 has a flow cavity inside; a collection cylinder 9 is connected to the scraper plate 81 by bolts and threads, and the collection cylinder 9 is connected to the flow cavity; when the scraper 82 rotates with the connecting rod 8 to scrape the impurities on the surface of the filter screen 71, the impurities fall off and can fall into the flow cavity inside the scraper plate 81, and then fall into the collection cylinder 9 for collection and temporary storage. When too many impurities are collected, the operator only needs to remove the collection cylinder 9 from the scraper plate 81 by bolts to easily clean the temporarily stored impurities. After cleaning, the collection cylinder 9 is reinstalled on the scraper plate 81 for subsequent collection of impurities. This design makes the impurity cleaning process convenient and quick, without the need for large-scale disassembly of the entire exhaust assembly, reducing equipment downtime and improving the operating efficiency of the exhaust gas treatment device; at the same time, the setting of the flow cavity and the collection cylinder 9 effectively reduces the accumulation and scattering of impurities around the filter screen 71, keeping the working environment of the exhaust assembly clean.

[0032] A sliding blade 91 is slidably connected to the scraper plate 81, and a counterweight is fixed to the sliding blade 91. The sliding blade 91 is in contact with the surface of the scraper 82. When the scraper 82 scrapes impurities on the filter screen 71 for a long time, some impurities may adhere to the scraper 82 and affect its operation. By utilizing the sliding blade 91 as the connecting rod 8 rotates, the counterweight on the sliding blade 91 slides up and down and fits tightly against the surface of the scraper 82 under the action of gravity. This can scrape off the impurities adhering to the scraper 82 in time, ensuring that the scraping effect of the scraper 82 is not affected and maintaining the cleanliness of the filter screen 71 surface. The weight of the counterweight does not affect the normal exhaust of the exhaust fan blade 33, further ensuring the efficiency of exhaust gas treatment. Moreover, the sliding design of the sliding blade 91 is ingenious. It does not require an additional power source and can achieve automatic cleaning function by relying only on its own counterweight. This reduces the energy consumption and maintenance cost of the equipment and improves the practicality and economy of the entire exhaust gas treatment device.

[0033] Working Process: When treating exhaust gas generated in an automotive painting workshop, a large volume of low-concentration painting exhaust gas is introduced into the purification chamber 1 by the exhaust system. Subsequently, a large amount of exhaust gas passes through the funnel of the guide box 11 to the ordinary activated carbon layer. During the flow of the exhaust gas within the guide box 11, the ordinary activated carbon layer performs initial adsorption until it reaches the filter plate 13 on the fixed frame 12, where it is filtered and discharged by the high-efficiency activated carbon plate 14. This device, through this multi-stage filtration structure, effectively improves the pretreatment and purification effect of large volume, low-concentration painting exhaust gas. When replacing the activated carbon plate 14 after prolonged filtration before operation, the operator first holds the connecting frame 22 and slides it upwards. The connecting frame 22 simultaneously drives the two trapezoidal blocks 23 upwards. At this time, the two trapezoidal blocks 23 release the restriction on the two connecting plates 2, and then the two connecting plates 2 are pulled out from the two fixed blocks 21. Plate 13 and activated carbon plate 14 are also pulled out from the fixing frame 12. Then, the operator can easily remove the clogged activated carbon plate 14 from the filter plate 13 and replace it with a new high-efficiency activated carbon plate 14. After the replacement is completed, the operator holds the filter plate 13 and reinserts it into the fixing frame 12. The two connecting plates 2 are also inserted into the inner wall of the two fixing blocks 21. The two connecting plates 2 press against the inclined surface of the two trapezoidal blocks 23, causing them to slide upward synchronously with the connecting frame 22 until the two connecting plates 2 pass over the two trapezoidal blocks 23. Then, the two trapezoidal blocks 23 slide down and limit the two connecting plates 2 in the two fixing blocks 21, ensuring that the filter plate 13 and the new activated carbon plate 14 are firmly installed in the fixing frame 12. This design makes the operation process simple and quick when the clogged activated carbon plate 14 needs to be replaced, shortens the equipment downtime, and improves the operating efficiency of the waste gas treatment device. When painting a car, the vehicle can be driven into the paint spraying box 35 for painting, making it easy to collect the exhaust gas generated during the painting process. Then, the electric slider moves the sealing plate 3 to the front of a purification box 1, allowing the exhaust assembly to connect with the purification box 1. The inner wall of the purification box 1 is connected to both ends of the sealing plate 3 via two folding curtains 34. One folding curtain 34 unfolds to seal the other purification box 1 that is not connected. The servo motor 32 on the fan frame 31 rotates, driving multiple exhaust fan blades 33 to agitate and extract the large volume of low-concentration painting exhaust gas generated in the paint spraying box 35. This large volume of low-concentration painting exhaust gas is drawn into the guide box 11 and converted into high-concentration, rapidly flowing exhaust gas. After initial adsorption by the activated carbon layer, the exhaust gas undergoes further filtration by the high-efficiency activated carbon plate 14 fixed to the filter screen plate 13, ensuring that the emitted exhaust gas meets environmental standards. When the activated carbon plate 14 on a purification box 1 becomes clogged and needs replacement, the electric slider... The block can drive the sealing plate 3 to slide to another purification box 1 for docking, switching the spray painting exhaust gas treatment channel. It can be used for non-stop maintenance or short-term shutdown switching. The specific machine operation status depends on the site conditions. During short-term shutdown switching, the staff can use this time to quickly replace the blocked activated carbon plate 14. Since the whole replacement process is simple and quick, it will not delay the overall operation of the exhaust gas treatment device. Moreover, this switchable channel design greatly improves the flexibility and practicality of the exhaust gas treatment device. It can be flexibly adjusted according to actual production needs and equipment maintenance conditions to ensure the continuous and efficient operation of exhaust gas treatment in the automotive painting workshop. At the same time, the design of the folding curtain 34 not only plays a role in the stable connection when the exhaust component docks with the purification box 1, but also effectively seals the unconnected purification box 1 when switching channels, reducing exhaust gas leakage and ensuring the safety and environmental protection of the exhaust gas treatment process. When a large volume of low-concentration spraying exhaust gas is introduced into the funnel opening of the guide box 11, the converted high-concentration and rapidly flowing exhaust gas is diverted. Part of the exhaust gas flows through the four-corner channel formed by the first sleeve 4 and the inner wall of the guide box 11, and is pre-treated and filtered by the activated carbon layer on the inner wall of the guide box 11. Part of the exhaust gas is spirally conveyed through the first spiral blade 41 between the first sleeve 4 and the second sleeve 42, and another part of the exhaust gas is spirally conveyed through the second spiral blade 43 between the second sleeve 42 and the fixed rod 44. The paint mist exhaust gas passing through the funnel opening is accelerated and then conveyed through the two spiral channels. The denser paint mist particles are thrown towards the wall surface, which can collect the paint mist particles contained in the exhaust gas, effectively reducing the clogging and pollution of the high-efficiency activated carbon plate 14 by paint mist particles, extending the service life of the activated carbon plate 14, and reducing the cost of the exhaust gas treatment device. This design reduces maintenance costs and replacement frequency. Simultaneously, the multi-channel spiral conveyor design increases the flow path and residence time of the exhaust gas within the guide box 11, allowing pollutants in the exhaust gas to come into more complete contact with and be adsorbed, further improving the exhaust gas pretreatment effect. When the exhaust gas is introduced into the spiral flow at the first spiral blade 41 and the second spiral blade 43, multiple inclined flow holes 5 are evenly distributed on the first spiral blade 41 and the second spiral blade 43, allowing some exhaust gas to flow through multiple flow holes 5, reducing the excessive exhaust gas pressure in the spiral channel caused by poor exhaust gas flowability, and avoiding the problem of decreased exhaust gas treatment efficiency due to uneven pressure. At the same time, these inclined flow holes 5 also play a certain guiding role, allowing the exhaust gas to flow more smoothly in the spiral channel, further optimizing the exhaust gas pretreatment process. When some of the exhaust gas flows into the four-corner channel formed by the inner wall of the first sleeve 4 and the guide box 11, multiple thin plates of different widths are assembled in the four-corner channel, and each separation plate 6 is inclined and bent, so that the exhaust gas can adsorb more paint mist particles after passing through the thin plates. The inclined and bent design of the thin plates can increase the contact area and contact time between the exhaust gas and the thin plates, thereby more effectively capturing and adsorbing paint mist particles, further reducing the blockage and pollution of the subsequent high-efficiency activated carbon plate 14 by paint mist particles. This design not only improves the effect of exhaust gas pretreatment, but also enhances the stability and durability of the entire exhaust gas treatment device. When multiple exhaust fan blades 33 rotate to draw in a large volume of low-concentration spray painting exhaust gas, the filter screen frame 7, fixed to the sealing plate 3, serves as support for the filter screen 71. The filter screen 71 performs preliminary pre-treatment filtration of impurities in the large volume of low-concentration spray painting exhaust gas, intercepting larger particles and preventing them from entering subsequent exhaust gas treatment channels and causing unnecessary blockage and damage to the activated carbon layer and high-efficiency activated carbon plate 14. This extends the service life of key filter components in the entire exhaust gas treatment device, reduces the cost of frequent maintenance and replacement of parts due to impurity blockage, and improves the overall operational stability and economy of the exhaust gas treatment device. Furthermore, the pre-treatment filtration by the filter screen 71 also reduces the burden on subsequent filter components. The reduced filtration burden makes the entire exhaust gas treatment process more efficient and smooth, ensuring that the treated exhaust gas can better meet environmental emission standards. When a large amount of impurities are filtered onto the filter screen 71, as the output end of the servo motor 32 drives the connecting rod 8 to rotate, the scraper plate 81 also rotates. The scraper blade 82, located at the front end of the scraper plate 81, scrapes against the surface of the filter screen 71, which can promptly clean the impurities accumulated on the filter screen 71, reducing the impact of impurities accumulating on the filter screen 71 for a long time, thus preventing them from affecting its filtration effect or even causing the filter screen 71 to become clogged and affecting the normal operation of the entire exhaust assembly. Moreover, the scraping action of the scraper blade 82 is continuous and stable, which can ensure that the surface of the filter screen 71 is always kept relatively clean, further extending the service life of the filter screen 71. This design extends the service life of the waste gas treatment device, improving its automation level and operational efficiency, making the entire waste gas treatment process more efficient and stable. When the scraper 82 rotates with the connecting rod 8 to scrape impurities from the surface of the filter screen 71, the impurities fall into the flow chamber inside the scraper plate 81. Subsequently, the impurities pass through the flow chamber and fall into the collection cylinder 9 for temporary storage. When too many impurities are collected, the operator simply needs to remove the collection cylinder 9 from the scraper plate 81 using bolts to easily clean the temporarily stored impurities. After cleaning, the collection cylinder 9 is reinstalled on the scraper plate 81 for continued impurity collection. This design makes the impurity cleaning process convenient and quick, eliminating the need for large-scale disassembly of the entire exhaust assembly and reducing equipment downtime. The operating efficiency of the exhaust gas treatment device is improved. At the same time, the arrangement of the flow chamber and the collection cylinder 9 effectively reduces the accumulation and scattering of impurities around the filter screen 71, keeping the working environment of the exhaust component clean. When the scraper 82 scrapes the impurities on the filter screen 71 for a long time, some impurities are easy to stick to the scraper 82 and affect its operation. By using the sliding blade 91 to slide with the rotation of the connecting rod 8, the counterweight on the sliding blade 91 slides up and down and fits tightly against the surface of the scraper 82 under the action of gravity, which can scrape off the impurities adhering to the scraper 82 in time, ensuring that the scraping effect of the scraper 82 is not affected, maintaining the cleanliness of the surface of the filter screen 71. The weight of the counterweight does not affect the normal exhaust of the exhaust fan blade 33, further ensuring the exhaust gas treatment efficiency.Moreover, the sliding blade 91 features a clever sliding design, requiring no additional power source and relying solely on its own counterweight to achieve automatic cleaning. This reduces energy consumption and maintenance costs, improving the practicality and economy of the entire waste gas treatment device.

[0034] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for treating large-volume, low-concentration spraying exhaust gas, characterized in that: The device includes a purification chamber; a flow guide box is fixedly connected to the inner wall of the purification chamber, one end of which is configured as a flared opening, and an activated carbon layer is built into the inner wall of the flow guide box; a fixing frame is fixedly connected to the end of the flow guide box away from the flared opening; a filter plate is inserted into the fixing frame; an activated carbon plate is fixedly connected to the filter plate; and an exhaust assembly is provided at one end of the purification chamber for drawing air into the interior of the purification chamber.

2. The large-volume, low-concentration spraying exhaust gas treatment device according to claim 1, characterized in that: Two connecting plates are fixedly attached to the filter screen plate; two fixing blocks are fixedly attached to the fixing frame, and the connecting plates are inserted into the inner wall of the fixing blocks; a connecting frame is slidably connected to the fixing frame; two trapezoidal blocks are fixedly attached to the connecting frame, and the trapezoidal blocks are slidably connected to the fixing blocks.

3. The large-volume, low-concentration spraying exhaust gas treatment device according to claim 1, characterized in that: A spraying box is provided at one end of the purification unit; the exhaust assembly includes a sealing plate, a fan frame, a servo motor, exhaust fan blades, and folding curtains; the sealing plate is slidably connected to the spraying box via an electric slider, and two sets of purification units are installed on the purification unit; the fan frame is fixedly connected to the sealing plate; the servo motor is fixedly connected to the fan frame; multiple exhaust fan blades are fixedly connected to the output end of the servo motor; two folding curtains are fixedly connected to both sides of the sealing plate, and the folding curtains are fixedly connected to the inner wall of the purification unit.

4. The large-volume, low-concentration spraying waste gas treatment device according to claim 1, characterized in that: A first sleeve is fixedly connected to the inner wall of the flow guide box; a first spiral blade is fixedly connected to the inner wall of the first sleeve; a second sleeve is fixedly connected to the first spiral blade; a second spiral blade is fixedly connected to the inner wall of the second sleeve; and a fixing rod is fixedly connected to the second spiral blade.

5. The large-volume, low-concentration spraying waste gas treatment device according to claim 4, characterized in that: Both the first and second helical blades are provided with multiple flow holes, and the flow holes are set at an angle.

6. The large-volume, low-concentration spraying exhaust gas treatment device according to claim 4, characterized in that: The first sleeve is fixed to the outside with a separation plate, which is composed of multiple thin plates of different widths and is set to be inclined and curved.

7. The large-volume, low-concentration spraying waste gas treatment device according to claim 3, characterized in that: A filter frame is fixedly connected to the side of the sealing plate away from the purification chamber; a filter screen is fixedly connected to the inner wall of the filter frame.

8. The large-volume, low-concentration spraying waste gas treatment device according to claim 7, characterized in that: A connecting rod is fixedly connected to the output end of the servo motor; a scraper is fixedly connected to the connecting rod; and a scraper blade is fixedly connected to the scraper.

9. A large-volume, low-concentration spraying waste gas treatment device according to claim 8, characterized in that: The scraper plate has a flow cavity inside; a collection cylinder is connected to the scraper plate by bolts and threads, and the collection cylinder is connected to the flow cavity.

10. A large-volume, low-concentration spraying exhaust gas treatment device according to claim 9, characterized in that: A sliding blade is slidably connected to the scraper plate, a counterweight is fixed to the sliding blade, and the sliding blade is in contact with the surface of the scraper blade.

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