Exhaust multi-stage purification device for environment-friendly spray booth

Abstract

The invention discloses an exhaust multi-stage purification device for an environment-friendly spray-baking finish house, and relates to the technical field of spray-baking finish house waste gas purification treatment. According to the exhaust multi-stage purification device for the environment-friendly spray booth, through linkage cooperation of the double-layer bottom plate and the winding mechanism, after the lower bottom plate loosens front filter cotton through lifting motion, the winding roller can automatically wind saturated filter cotton, the unwinding roller synchronously releases new filter cotton, manual disassembly and replacement are not needed in the whole process, automation of filter cotton replacement is achieved, and the efficiency is improved. The lifting motion of the double-layer bottom plate is precisely matched with the winding action of the winding mechanism, under the normal state, the pressing effect of the lower bottom plate can prevent the filter cotton from shifting and wrinkling under the negative pressure effect, it is guaranteed that the filtering area is uniform, the filtering efficiency of the filter cotton is improved, and the service life of the filter cotton is prolonged; the filter cotton can be prevented from being torn and damaged due to the fact that the filter cotton is pressed tightly to generate too large tension in the rolling process.

Description

Technical Field

[0001] This invention relates to the field of exhaust gas purification and treatment technology for spray painting booths, specifically to an environmentally friendly multi-stage exhaust purification device for spray painting booths. Background Technology

[0002] During the paint spraying and drying process, automotive paint booths generate a large amount of organic waste gas containing paint mist particles. Direct emission of this waste gas would cause serious air pollution. In addition, the paint mist particles in the waste gas are prone to adhering to the inner wall of the booth and the surface of the heating equipment, affecting the paint quality and the service life of the equipment. Therefore, exhaust purification devices are required to treat the waste gas.

[0003] Existing technologies mostly employ water curtain washing or activated carbon adsorption as core purification methods. Water curtain washing generates a large amount of paint-containing wastewater, causing secondary pollution and incurring high costs for subsequent water treatment. Activated carbon adsorption is a gas-phase adsorption purification method, which is easily saturated, requires frequent replacement, and poses a risk of exhaust gas penetration after adsorption saturation. Furthermore, none of the above methods fall under the category of physical filtration, and their purification principles and structural forms have significant limitations. In addition, purification devices that use filter cotton for physical filtration often have the filter cotton fixedly installed inside the filter chamber. Once the filter cotton becomes saturated and clogged with paint mist, the machine must be shut down and the equipment manually disassembled and replaced. This is not only time-consuming and labor-intensive, increasing manual maintenance costs, but also directly interrupts the paint baking process, seriously affecting the continuous production efficiency of automotive spray painting and making it unsuitable for the needs of industrialized mass production.

[0004] In view of the many shortcomings of the existing technologies, the development of an exhaust purification device for paint spraying booths that can automatically replace filter elements, provide uninterrupted filtration throughout the cotton replacement process, feature compact and reliable mechanical linkage, multi-stage physical purification, and energy-saving hot air circulation has become an urgent technical problem to be solved in this field. Summary of the Invention

[0005] The purpose of this invention is to provide an environmentally friendly multi-stage exhaust purification device for spray painting booths, in order to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a multi-stage exhaust purification device for an environmentally friendly spray painting booth, comprising a body and a sealing and leak-proof assembly. The body has a painting chamber located at the top and a filter chamber located at the bottom. An upper base plate is provided at the connection between the bottom of the painting chamber and the filter chamber, and the upper base plate is a fixed structure used to support equipment and vehicles entering the painting chamber. The sealing and leak-proof assembly is located at the top of the filter chamber and includes a lower base plate located below the upper base plate. A sealing strip is embedded on the outer periphery of the lower base plate, and lifting rods are connected to both sides of the bottom of the lower base plate. The lower base plate has an internal support fixed inside. A torsion spring support is fixedly installed on the inner wall of the recess in the middle of the internal support, and a support roller is rotatably installed at the end of the torsion spring support. A pre-filter cotton is sandwiched between the upper base plate and the lower base plate. The pre-filter cotton is wound around the outer circumference of the unwinding roller, and the unwinding roller is fixedly installed on one side of the bottom of the filter chamber through the support. The paint mist in the paint baking chamber enters the filter chamber through the upper base plate under negative pressure and is intercepted by the fiber filter material of the pre-filter cotton. The pre-filter cotton is pressed tightly against the bottom outer circumference of the upper base plate by the pressure strip on the top outer circumference of the lower base plate to ensure the filtration area and sealing effect.

[0007] Furthermore, a clutch winding assembly is installed on the other side of the bottom of the filter chamber. The clutch winding assembly includes a winding roller that is fixedly installed on the other side of the bottom of the filter chamber by a bracket. A key shaft is coaxially fixed on the side end of the winding roller, and a sliding sleeve is axially slidably installed on the outside of the key shaft. The sliding sleeve is provided with a keyway that cooperates with the key protrusion on the outer periphery of the key shaft.

[0008] Furthermore, the clutch winding assembly also includes a driven disc coaxially fixed to the end of the sliding sleeve. The driven disc is driven by friction with the inner wall of the drive disc cavity. The drive disc is fixedly connected to the rotating end of the motor. When the sliding sleeve moves axially outside the key shaft until the driven disc engages with the drive disc, the transmission link between the motor and the winding roller is established; otherwise, the transmission link is disconnected.

[0009] Furthermore, the clutch winding assembly also includes an annular groove radially arranged on the outer periphery of the sliding sleeve, a drive pin is engaged inside the annular groove, and the drive pin is fixedly connected to the axial end of the telescopic rod, and the head end of the telescopic rod is fixedly connected to the telescopic end of the electric cylinder.

[0010] Furthermore, a linkage lifting assembly is installed at the bottom center of the filter chamber. The linkage lifting assembly includes a support plate fixedly installed at the bottom center of the filter chamber. A bracket for powering a cylinder is fixed to the outside of the side end of the support plate, and hanging plates are fixed at equal intervals on both sides of the support plate along the long side direction.

[0011] Furthermore, the linkage lifting assembly also includes a V-shaped pin rotatably mounted on the inner side of the hanging plate. A drive shaft is installed at the rotation axis of the V-shaped pin, and the support plate rotates in linkage with the V-shaped pins on both sides through the drive shaft.

[0012] Furthermore, the linkage lifting assembly also includes a trunnion connected to one end of the V-pin. The trunnions are evenly spaced along the axis of the telescopic rod, and the linear motion of the telescopic rod is converted into the oscillating motion of the V-pin around the transmission shaft through the trunnions.

[0013] Furthermore, the linkage lifting assembly also includes a sliding groove at the other end of the V-shaped pin. The sliding groove is slidably engaged with the bottom pin of the lifting rod, and the swaying motion of the V-shaped pin is converted into the lifting motion of the lower base plate through the cooperation of the sliding groove and the lifting rod to adjust the distance between the lower base plate and the upper base plate.

[0014] Furthermore, the side of the machine body is provided with an equipment cavity, and a circulating fan is fixedly installed at the bottom of the equipment cavity. The air inlet of the circulating fan is connected to an air inlet pipe, and the end of the air inlet pipe away from the air inlet of the circulating fan is connected to an air intake module. The air intake module is horizontally arranged at the bottom of the filter cavity, and the air intake module is located below the recess of the support plate.

[0015] Furthermore, the outlet of the circulating fan is connected to a post-filter, and the output end of the post-filter is connected to an air outlet pipe. The end of the air outlet pipe is connected to a heater, and the heater is located at the top of the filter chamber to heat the circulating air for easy drying of the paint surface.

[0016] This invention provides an environmentally friendly multi-stage exhaust purification device for spray painting booths, which has the following beneficial effects; 1. This application utilizes a double-layer base plate and a winding mechanism in a coordinated manner. After the lower base plate releases the pre-placed filter cotton through its lifting motion, the winding roller automatically winds up the saturated filter cotton, and the unwinding roller simultaneously releases new filter cotton. The entire process requires no manual disassembly or replacement, automating filter cotton replacement. The precise coordination between the lifting motion of the double-layer base plate and the winding action of the winding mechanism ensures that the pressure of the lower base plate prevents the filter cotton from shifting or wrinkling under negative pressure, guaranteeing a uniform filtration area and improving the filtration efficiency and lifespan of the filter cotton. During filter cotton replacement, the lower base plate lowers to release the filter cotton, preventing excessive tension during winding that could cause tearing or damage. Simultaneously, the support roller acts as a guide during winding, ensuring flat winding and smooth transport of the filter cotton, reducing filter cotton loss and lowering the cost of filter cotton replacement consumables. Furthermore, the clamping and limiting function of the edge strip prevents the new filter cotton from shifting after installation, ensuring proper installation and further guaranteeing the stability of the filtration effect.

[0017] 2. This application achieves the core advantage of continuous filtration during cotton replacement through the structural design of a double-layer bottom plate and the auxiliary role of the support roller. Under normal conditions, the lower bottom plate tightly presses the pre-filter cotton against the bottom of the upper bottom plate through the outer perimeter pressing strip, ensuring the maximum effective filtration area and preventing exhaust gas from leaking from the edge of the filter cotton. During cotton replacement, although the lower bottom plate descends with the linkage mechanism and the distance between it and the upper bottom plate increases, the torsion spring bracket on the inner support of the lower bottom plate will drive the support roller to rise upward under the action of the torsion spring, tightly fitting the bottom of the pre-filter cotton and pressing the pre-filter cotton against the bottom of the upper bottom plate. This ensures that the pre-filter cotton always remains in contact with the upper bottom plate throughout the cotton replacement process, and the exhaust gas still needs to pass through the pre-filter cotton to enter the filtration chamber. This completely avoids the problem of direct discharge and short circuit of exhaust gas during cotton replacement, ensuring the continuity of purification effect and meeting environmental emission requirements.

[0018] 3. This application precisely converts the linear motion of the telescopic rod into the oscillating motion of the V-shaped pin around the drive shaft via the trunnion. Furthermore, the V-shaped pins on opposite sides of the support plate rotate synchronously via the drive shaft, ensuring that the lifting rods on both sides of the lower base plate are simultaneously stressed and raised / lowered. This effectively avoids the problems of skewing and jamming during the lower base plate's lifting process, ensuring the parallelism between the lower and upper base plates. This, in turn, ensures that the filter cotton is evenly compressed, preventing exhaust gas leakage caused by poor local sealing. It also avoids interference from the lower base plate's skewing on the filter cotton winding and laying, improving the stability and reliability of the device's operation. Under normal conditions, the telescopic rod retracts, and the V-shaped pin drives the lifting rod upwards via the slide groove, pressing the filter cotton against the lower base plate to ensure a sealing effect. When changing the filter cotton, the telescopic rod extends, and the V-shaped pin oscillates in the opposite direction, causing the lower base plate to descend to a suitable distance. This loosens the filter cotton, ensuring smooth winding by the take-up roller and unwinding by the unwind roller, while preventing the support roller from failing to support the filter cotton due to excessive descent of the lower base plate. This balances the sealing requirements of the filter cotton with the efficiency of filter cotton changing.

[0019] 4. In this application, when the telescopic rod extends, the drive pin at its end drives the sliding sleeve to move axially along the key shaft through the annular groove. When the sliding sleeve moves to the point where the driven plate engages with the drive plate, the motor establishes a transmission connection with the winding roller, and the winding roller starts winding. At the same time, the extension of the telescopic rod drives the lower base plate to descend through the linkage of the V-shaped pin, loosening the filter cotton and realizing the synchronous action of loosening the cotton and winding. When the telescopic rod retracts, the drive pin drives the sliding sleeve to move in the opposite direction, the driven plate separates from the drive plate, disconnects the transmission connection, and the winding roller stops winding. At the same time, the retraction of the telescopic rod drives the V-shaped pin to swing in the opposite direction, the lower base plate rises and resets, and presses the new filter cotton, realizing the synchronous action of stopping winding and pressing the filter cotton. This synchronous linkage design completely avoids the filter cotton tearing and winding roller jamming caused by starting winding before the filter cotton is loosened, or the exhaust gas leakage and filter cotton displacement caused by the filter cotton being loosened but winding not starting. It greatly improves the reliability and stability of the device operation. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the external structure of the device of the present invention; Figure 2 This is a longitudinal sectional view of the device of the present invention; Figure 3 This is a schematic diagram of the transverse cross-sectional structure of the device of the present invention; Figure 4 This is a partial exploded structural diagram of the device of the present invention; Figure 5 This is a schematic diagram illustrating the cooperation method of the clutch winding assembly, the linkage lifting assembly, and the edge pressing and leak-proof assembly of the present invention; Figure 6 This is a cross-sectional view of the clutch and rewind assembly of the present invention; Figure 7 This is a cross-sectional view of the linkage lifting component of the present invention; Figure 8 This is an enlarged structural schematic diagram of the edge-pressing and leak-proof component of the present invention.

[0021] In the diagram: 1. Machine body; 2. Paint baking chamber; 3. Filter chamber; 4. Upper base plate; 5. Edge pressing and leak-proof assembly; 501. Lower base plate; 502. Edge pressing strip; 503. Lifting rod; 504. Inner support; 505. Torsion spring support; 506. Support roller; 6. Front filter cotton; 7. Unwinding roller; 8. Clutch and rewinding assembly; 801. Rewinding roller; 802. Key shaft; 803. Sliding sleeve; 804. Driven disc; 805. Drive disc; 806. Motor; 807. Ring groove; 808. Drive pin; 809. Telescopic rod; 810. Electric cylinder; 9. Linkage lifting assembly; 901. Support plate; 902. Hanging plate; 903. V-pin; 904. Drive shaft; 905. Trunnion; 906. Slide groove; 10. Equipment cavity; 11. Circulating fan; 12. Air inlet pipe; 13. Air inlet module; 14. Post-filter; 15. Air outlet pipe; 16. Heater. Detailed Implementation

[0022] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention. Please see Figures 1 to 8This invention provides a technical solution: an environmentally friendly multi-stage exhaust purification device for a spray painting booth, comprising a body 1 and a sealing and leak-proof assembly 5. The body 1 has a painting chamber 2 located at its upper interior and a filter chamber 3 located at its lower interior. An upper base plate 4 is provided at the connection between the bottom of the painting chamber 2 and the filter chamber 3. The upper base plate 4 is a fixed structure used to support equipment and vehicles entering the painting chamber 2. The sealing and leak-proof assembly 5 is located at the top of the filter chamber 3 and includes a lower base plate 501 located below the upper base plate 4. A sealing strip 502 is embedded around the outer periphery of the lower base plate 501. Lifting rods 503 are connected to both sides of the bottom of the lower base plate 501. An inner support 504 is fixedly installed in the middle of the inner support 504. A torsion spring support 505 is fixedly installed on the inner wall of the recess in the middle of the inner support 504. A support roller 506 is rotatably installed at the end of the torsion spring support 505. A pre-filter cotton 6 is sandwiched between the upper bottom plate 4 and the lower bottom plate 501. The pre-filter cotton 6 is wound around the outer periphery of the unwinding roller 7. The unwinding roller 7 is fixedly installed on one side of the bottom of the filter chamber 3 through the support. The paint mist in the paint baking chamber 2 enters the filter chamber 3 through the upper bottom plate 4 under negative pressure and is intercepted by the fiber filter material of the pre-filter cotton 6. The pre-filter cotton 6 is pressed tightly against the bottom outer periphery of the upper bottom plate 4 by the pressure strip 502 on the top outer periphery of the lower bottom plate 501 to ensure the filtration area and sealing effect. The specific operation is as follows: This application uses a double-layer bottom plate and a winding mechanism in linkage, so that after the lower bottom plate 501 loosens the pre-filter cotton 6 through its lifting movement, the winding roller 801 can automatically wind up the saturated filter cotton, and the unwinding roller 7 simultaneously releases the new filter cotton. The entire process requires no manual disassembly or replacement, achieving automated filter cotton replacement. The lifting movement of the double-layer bottom plate and the winding action of the winding mechanism are precisely coordinated. Under normal conditions, the pressing action of the lower bottom plate 501 can prevent the filter cotton from shifting or wrinkling under negative pressure, ensuring uniform filtration area and improving the filtration efficiency and service life of the filter cotton. When changing the cotton, the lower bottom plate 501 descends to loosen the filter cotton, preventing excessive tension on the filter cotton during winding, which could lead to tearing or damage. Simultaneously with the descent of the lower bottom plate 501, the torsion spring bracket 505 on its inner support 504 drives the support roller 506 to rise under the action of the torsion spring. The support roller 506 tightly supports the bottom of the pre-filter cotton 6, ensuring that the pre-filter cotton 6 remains in place during the cotton replacement process. Finally, the upper base plate 4 is adhered to maintain the filtration area and sealing effect. This application achieves the core advantage of continuous filtration during cotton replacement through the double-layer base plate structure design and the auxiliary role of the support roller 506. Under normal conditions, the lower base plate 501 tightly presses the pre-filter cotton 6 against the bottom of the upper base plate 4 through the outer peripheral pressing strip 502, ensuring the maximum effective filtration area and preventing exhaust gas from leaking from the edge of the filter cotton. During cotton replacement, although the lower base plate 501 descends with the linkage mechanism and the distance between it and the upper base plate 4 is increased, the lower base plate 501 remains firmly attached to the upper base plate 4. Under the action of the torsion spring force, the torsion spring bracket 505 on the inner bracket 504 will drive the support roller 506 to lift up and fit tightly against the bottom of the pre-filter cotton 6, pressing the pre-filter cotton 6 against the bottom of the upper base plate 4. This ensures that the pre-filter cotton 6 remains in contact with the upper base plate 4 throughout the cotton replacement process, and the exhaust gas still needs to pass through the pre-filter cotton 6 to enter the filter chamber 3. This completely avoids the problem of direct discharge and short circuit of exhaust gas during the cotton replacement process, ensuring the continuity of the purification effect and meeting the environmental emission requirements. Please see Figures 5 to 6A clutch winding assembly 8 is installed on the other side of the bottom of the filter chamber 3. The clutch winding assembly 8 includes a winding roller 801 fixedly mounted on the other side of the bottom of the filter chamber 3 by a bracket. A key shaft 802 is coaxially fixed to the side end of the winding roller 801, and a sliding sleeve 803 is axially slidably mounted on the outside of the key shaft 802. The sliding sleeve 803 has a keyway inside that mates with the key protrusion on the outer periphery of the key shaft 802. The clutch winding assembly 8 also includes a driven disc 804 coaxially fixed to the end of the sliding sleeve 803. The driven disc 804 and the inner wall of the drive disc 805 are driven by friction. The disc 805 is fixedly connected to the rotating end of the motor 806. When the sliding sleeve 803 moves axially outside the key shaft 802 until the driven disc 804 engages with the drive disc 805, the transmission link between the motor 806 and the take-up roller 801 is established. Otherwise, the transmission link is disconnected. The clutch take-up assembly 8 also includes an annular groove 807 radially arranged on the outer periphery of the sliding sleeve 803. A drive pin 808 is engaged inside the annular groove 807. The drive pin 808 is fixedly connected to the axial end of the telescopic rod 809. The head end of the telescopic rod 809 is fixedly connected to the telescopic end of the electric cylinder 810. The specific operation is as follows: During the extension of the telescopic rod 809, the drive pin 808 at its end drives the sliding sleeve 803 to move axially along the key shaft 802 through the annular groove 807 until the driven disk 804 at the end of the sliding sleeve 803 engages with the drive disk 805 at the rotating end of the motor 806, establishing a transmission connection between the motor 806 and the take-up roller 801. The take-up roller 801 starts to take up the saturated pre-filter cotton 6, and the unwind roller 7 releases the new filter cotton simultaneously. The support roller 506 simultaneously realizes the filter cotton conveying and guiding. After the new filter cotton is laid in place, the electric cylinder 810 drives the telescopic rod 809 to retract, the driven plate 804 separates from the drive plate 805, disengaging the transmission. The V-shaped pin 903 rotates in the opposite direction, causing the lower base plate 501 to rise and reset. The edge clamping strip 502 re-clamps and limits the new front filter cotton 6, and the device returns to normal circulation filtration. In this application, when the telescopic rod 809 extends, its end drive pin 808 drives the sliding sleeve 803 to move axially along the key shaft 802 through the annular groove 807. When the sliding sleeve 80... When the driven disc 804 engages with the drive disc 805, the motor 806 establishes a transmission connection with the take-up roller 801, and the take-up roller 801 starts winding. Simultaneously, the extension of the telescopic rod 809, through the linkage of the V-pin 903, causes the lower base plate 501 to descend, releasing the filter cotton and achieving a synchronous action of releasing the cotton and immediately winding it up. When the telescopic rod 809 retracts, the drive pin 808 causes the sliding sleeve 803 to move in the opposite direction, separating the driven disc 804 from the drive disc 805, disconnecting the transmission connection, and resuming winding. When roller 801 stops winding, the telescopic rod 809 retracts, causing the V-shaped pin 903 to swing in the opposite direction. The lower base plate 501 rises and resets, pressing the new filter cotton. This achieves the synchronous action of stopping winding and pressing the filter cotton simultaneously. This synchronous linkage design completely avoids misoperations such as filter cotton tearing and winding roller 801 jamming caused by starting winding before the filter cotton is loosened, or exhaust gas leakage and filter cotton displacement caused by the filter cotton being loosened but winding not starting. This greatly improves the reliability and stability of the device operation. Please see Figures 5 to 7 A linkage lifting assembly 9 is installed at the bottom center of the filter chamber 3. The linkage lifting assembly 9 includes a support plate 901 fixedly installed at the bottom center of the filter chamber 3. A bracket for mounting a power cylinder 810 is fixed to the outside of the side end of the support plate 901. Hanging plates 902 are fixed at equal intervals on both sides of the support plate 901 along the long side. The linkage lifting assembly 9 also includes a V-shaped pin 903 rotatably installed inside the hanging plate 902. A drive shaft 904 is installed at the rotation axis of the V-shaped pin 903. The support plate 901 rotates in linkage with the V-shaped pins 903 on both sides through the drive shaft 904. It also includes a trunnion 905 connected to one end of the V-pin 903. The trunnion 905 is evenly spaced along the axis of the telescopic rod 809. The linear motion of the telescopic rod 809 is converted into the oscillating motion of the V-pin 903 around the transmission shaft 904 through the trunnion 905. The linkage lifting assembly 9 also includes a slide groove 906 opened at the other end of the V-pin 903. The slide groove 906 is slidably engaged with the bottom pin of the lifting rod 503. The oscillating motion of the V-pin 903 is converted into the lifting motion of the lower base plate 501 through the engagement of the slide groove 906 and the lifting rod 503 to adjust the distance between the lower base plate 501 and the upper base plate 4. The specific operation is as follows: Under the automatic replacement condition of filter cotton saturation, when the front filter cotton 6 becomes saturated and clogged with paint mist, the differential pressure sensor detects that the differential pressure exceeds the standard and triggers the automatic replacement process. The electric cylinder 810 on the side of the support plate 901 is activated, driving the telescopic rod 809 to extend. The linear motion of the telescopic rod 809 is converted into the oscillating motion of the V-shaped pin 903 on the inner side of the hanging plate 902 around the transmission shaft 904 through the trunnion 905. The V-shaped pins 903 on both sides of the support plate 901 rotate synchronously through the transmission shaft 904. The sliding groove 906 at the other end of the V-shaped pin 903 slides and engages with the bottom pin of the lifting rod 503, converting the oscillating motion into the descending motion of the lower base plate 501, thus widening the gap between the lower base plate 501 and the upper base plate 4. In this application, the linear motion of the telescopic rod 809 is precisely converted into the oscillating motion of the V-shaped pin 903 around the transmission shaft 904 through the trunnion 905, and the V-shaped pins 903 on both sides of the support plate 901 rotate synchronously through the transmission shaft 904. This ensures that the lifting rods 503 on both sides of the lower base plate 501 are subjected to force and rise and fall synchronously, effectively avoiding the problems of skewing and jamming during the lifting and lowering of the lower base plate 501. It also ensures the parallelism between the lower base plate 501 and the upper base plate 4, thereby ensuring that the filter cotton is evenly compressed, avoiding exhaust gas leakage caused by localized poor sealing. Furthermore, it prevents interference from skewing of the lower base plate 501 on the winding and laying of the filter cotton, improving the stability and reliability of the device operation. Under normal conditions, the telescopic rod 809 retracts. The V-pin 903 drives the lifting rod 503 to rise through the slide groove 906, and the lower base plate 501 presses the filter cotton to ensure the sealing effect. When changing the cotton, the telescopic rod 809 extends, and the V-pin 903 swings in the opposite direction, driving the lower base plate 501 to fall to a suitable distance. This can loosen the filter cotton, ensuring that the winding roller 801 can be wound up smoothly and the unwinding roller 7 can be unwound smoothly. At the same time, it will not cause the support roller 506 to fail to support the filter cotton due to the lower base plate 501 falling too low. This balances the sealing requirements of the filter cotton and the efficiency of cotton changing. Please see Figures 1 to 4 The machine body 1 has an equipment cavity 10 on its side, and a circulating fan 11 is fixedly installed at the bottom of the equipment cavity 10. The air inlet of the circulating fan 11 is connected to an air inlet pipe 12, and the end of the air inlet pipe 12 away from the air inlet of the circulating fan 11 is connected to an air intake module 13. The air intake module 13 is horizontally arranged at the bottom of the filter cavity 3, and the air intake module 13 is located below the recess of the support plate 901. The air outlet of the circulating fan 11 is connected to a post-filter 14, and the output end of the post-filter 14 is connected to an air outlet pipe 15. The end of the air outlet pipe 15 is connected to a heater 16, and the heater 16 is arranged at the top of the filter cavity 3 to heat the circulating air for easy paint drying. The specific operation is as follows: Under normal circulating filtration conditions, the circulating fan 11 in the equipment chamber 10 is started. The fan forms a negative pressure environment at the bottom of the filter chamber 3 through the air inlet pipe 12 and the horizontally arranged air inlet module 13. The paint mist exhaust gas in the paint baking chamber 2 passes through the fixed upper bottom plate 4 under the action of negative pressure, enters the filter chamber 3, and is sandwiched between the upper bottom plate 4 and the lower bottom plate 501. The pre-filter cotton 6 achieves primary physical purification through fiber interception. The pressing strip 502 on the outer periphery of the top of the lower bottom plate 501 tightly adheres the pre-filter cotton 6 to the outer periphery of the bottom of the upper bottom plate 4, ensuring complete filtration area and sealing effect, and preventing exhaust gas side leakage and short circuit. The gas filtered by the pre-filter cotton 6 enters the bottom of the filter chamber 3 and is transported by the circulating fan 11 to the post-filter 14 to complete the secondary deep physical filtration. The purified gas is transported through the air outlet pipe 15 to the heater 16 at the top of the filter chamber 3. After heating, it flows back to the paint baking chamber 2 for paint drying, forming a closed-loop system of hot air circulation and exhaust gas purification.

[0023] In summary, this device is based on negative pressure circulation and multi-stage physical filtration, combined with a single-power driven mechanical linkage lifting and clutch winding mechanism to achieve continuous purification of paint baking exhaust gas and automatic replacement of filter cotton. The specific working process is divided into normal circulation filtration mode and automatic filter cotton replacement mode. First, under normal circulating filtration conditions, the circulating fan 11 in the equipment chamber 10 is started. The fan, through the air inlet pipe 12 and the horizontally arranged air inlet module 13, creates a negative pressure environment at the bottom of the filter chamber 3. Under the action of negative pressure, the paint mist exhaust gas in the paint baking chamber 2 passes through the fixed upper bottom plate 4, enters the filter chamber 3, and is sandwiched between the upper bottom plate 4 and the lower bottom plate 501. The pre-filter cotton 6 achieves primary physical purification through fiber interception. The pressing strip 502 on the outer periphery of the top of the lower bottom plate 501 tightly presses the pre-filter cotton 6. The filter is tightly attached to the outer periphery of the bottom of the upper base plate 4 to ensure complete filtration area and sealing effect, preventing side leakage and short circuit of exhaust gas. After being filtered by the pre-filter cotton 6, the gas enters the bottom of the filter chamber 3 and is transported by the circulating fan 11 to the post-filter 14 for secondary deep physical filtration. The purified gas is then transported through the exhaust pipe 15 to the heater 16 at the top of the filter chamber 3. After being heated, the gas flows back to the paint baking chamber 2 for paint drying, forming a closed-loop system of hot air circulation and exhaust gas purification. This application uses the linkage between the double-layer base plate and the winding mechanism to enable the lower base plate 501 to release the pre-filter cotton 6 through lifting and lowering movement. The winding roller 801 can automatically wind up the saturated filter cotton, and the unwinding roller 7 releases the new filter cotton simultaneously. The entire process does not require manual disassembly or replacement, realizing the automation of filter cotton replacement. The lifting and lowering movement of the double-layer base plate and the winding action of the winding mechanism are precisely coordinated. Under normal conditions, the pressing action of the lower base plate 501 can prevent the filter cotton from shifting or wrinkling under negative pressure, ensuring uniform filtration area and improving the filtration efficiency and service life of the filter cotton. When changing the filter cotton, the lower plate 501 descends to loosen the filter cotton, which can prevent the filter cotton from being pulled too tightly during the winding process, thus avoiding excessive tension that could cause the filter cotton to tear or be damaged. At the same time, the support roller 506 plays a guiding role during the winding process, ensuring that the filter cotton is wound flat and conveyed smoothly, reducing filter cotton loss and lowering the consumable cost of filter cotton replacement. In addition, the clamping and limiting function of the edge strip 502 can prevent the new filter cotton from shifting after it is laid, ensuring that the new filter cotton is installed in place and further ensuring the stability of the filtration effect. Secondly, under the automatic replacement condition of filter cotton saturation, when the front filter cotton 6 becomes saturated and clogged with paint mist, the differential pressure sensor detects that the differential pressure exceeds the standard and triggers the automatic replacement process. The electric cylinder 810 on the side of the support plate 901 is activated, driving the telescopic rod 809 to extend. The linear motion of the telescopic rod 809 is converted into the yaw motion of the V-shaped pin 903 on the inner side of the hanging plate 902 around the drive shaft 904 through the trunnion 905. The V-shaped pins 903 on both sides of the support plate 901 rotate synchronously through the drive shaft 904. The sliding groove 906 at the other end of the V-shaped pin 903 slides with the bottom pin of the lifting rod 503, converting the yaw motion into the downward motion of the lower base plate 501, thus widening the gap between the lower base plate 501 and the upper base plate 4. This application accurately converts the linear motion of the telescopic rod 809 into the yaw motion of the V-shaped pin 903 around the drive shaft 904 through the trunnion 905, and the V-shaped pins 903 on both sides of the support plate 901 rotate synchronously through the drive shaft 904, ensuring The lifting rods 503 on both sides of the lower base plate 501 are subjected to force and rise and fall synchronously, effectively avoiding the problems of skewing and jamming during the lifting of the lower base plate 501, ensuring the parallelism between the lower base plate 501 and the upper base plate 4, thereby ensuring that the filter cotton is evenly compressed, avoiding exhaust gas leakage caused by local poor sealing, and also avoiding interference caused by the skewing of the lower base plate 501 on the winding and laying of the filter cotton, improving the stability and reliability of the device operation. Under normal conditions, the telescopic rod 809 retracts, V The V-shaped pin 903 drives the lifting rod 503 to rise through the slide groove 906, and the lower base plate 501 presses the filter cotton to ensure the sealing effect. When changing the cotton, the telescopic rod 809 extends, and the V-shaped pin 903 swings in the opposite direction, driving the lower base plate 501 to fall to a suitable distance. This can loosen the filter cotton, ensuring that the winding roller 801 can smoothly wind up and the unwinding roller 7 can smoothly unwind, and also prevent the support roller 506 from failing to support the filter cotton due to the lower base plate 501 falling too low. This balances the sealing requirements of the filter cotton and the efficiency of cotton changing. Then, as the lower base plate 501 descends, the torsion spring bracket 505 on its inner support 504 lifts the support roller 506 under the action of the torsion spring. The support roller 506 is tightly supported and cooperates with the bottom of the pre-filter cotton 6, ensuring that the pre-filter cotton 6 always adheres to the upper base plate 4 during the cotton replacement process, maintaining the filtration area and sealing effect. This application achieves the core advantage of continuous filtration during cotton replacement through the double-layer base plate structure design and the auxiliary role of the support roller 506. Under normal conditions, the lower base plate 501 tightly presses the pre-filter cotton 6 against the bottom of the upper base plate 4 through the outer peripheral pressing strip 502, ensuring the maximum effective filtration area and preventing exhaust gas. Leakage from the edge of the filter cotton occurs during cotton replacement. Although the lower base plate 501 descends with the linkage mechanism and widens the gap with the upper base plate 4 during cotton replacement, the torsion spring bracket 505 on the inner support 504 of the lower base plate 501 will drive the support roller 506 to rise upward under the action of the torsion spring force, and fit tightly against the bottom of the front filter cotton 6. This ensures that the front filter cotton 6 remains in contact with the upper base plate 4 throughout the entire cotton replacement process. The exhaust gas still needs to pass through the front filter cotton 6 to enter the filter chamber 3, which completely avoids the problem of direct discharge and short circuit of exhaust gas during cotton replacement, ensuring the continuity of purification effect and meeting environmental emission requirements. Finally, during the extension of the telescopic rod 809, the drive pin 808 at its end drives the sliding sleeve 803 to move axially along the key shaft 802 through the annular groove 807 until the driven disc 804 at the end of the sliding sleeve 803 engages with the drive disc 805 at the rotating end of the motor 806, establishing a transmission connection between the motor 806 and the take-up roller 801. The take-up roller 801 starts to take up the saturated pre-filter cotton 6, and the unwind roller 7 simultaneously releases the new filter cotton. The support roller 506 simultaneously guides the filter cotton conveying. After the cotton is laid in place, the electric cylinder 810 drives the telescopic rod 809 to retract, the driven plate 804 separates from the drive plate 805, disengaging the transmission. The V-shaped pin 903 rotates in the opposite direction, causing the lower base plate 501 to rise and reset. The edge clamping strip 502 re-clamps and limits the new front filter cotton 6, and the device returns to normal circulation filtration. In this application, when the telescopic rod 809 extends, its end drive pin 808 drives the sliding sleeve 803 to move axially along the key shaft 802 through the annular groove 807. When the sliding sleeve 803 is in position... When the driven disc 804 engages with the drive disc 805, the motor 806 establishes a transmission connection with the take-up roller 801, and the take-up roller 801 starts winding. Simultaneously, the extension of the telescopic rod 809, through the linkage of the V-pin 903, causes the lower base plate 501 to descend, releasing the filter cotton and achieving a synchronous action of releasing the cotton and immediately winding it up. When the telescopic rod 809 retracts, the drive pin 808 causes the sliding sleeve 803 to move in the opposite direction, separating the driven disc 804 from the drive disc 805, disconnecting the transmission connection, and the take-up roller... At step 801, winding stops. Simultaneously, the telescopic rod 809 retracts, causing the V-shaped pin 903 to swing in the opposite direction. The lower base plate 501 rises and resets, pressing the new filter cotton. This achieves a synchronous action where winding stops and the filter cotton is pressed. This synchronous linkage design completely avoids misoperations such as filter cotton tearing or winding roller 801 jamming caused by starting winding before the filter cotton is loosened, or exhaust gas leakage or filter cotton displacement caused by the filter cotton being loosened but winding not starting. This significantly improves the reliability and stability of the device operation.

[0024] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0025] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only for the purpose of helping to understand the method and core ideas of the present invention. The above are only preferred embodiments of the present invention. It should be noted that due to the limitations of textual expression, and the objective existence of infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of the present invention.

Claims

1. An environmentally friendly multi-stage exhaust purification device for spray painting booths, comprising a main body (1) and a sealing and leak-proof assembly (5), characterized in that, The upper part of the body (1) is provided with a paint baking chamber (2), and the lower part of the body (1) is provided with a filter chamber (3). An upper base plate (4) is provided at the bottom of the paint baking chamber (2) and the filter chamber (3). The upper base plate (4) is a fixed structure used to support equipment and vehicles entering the paint baking chamber (2). The edge-pressing anti-leakage component (5) is set on the top of the filter chamber (3). The edge-pressing anti-leakage component (5) includes a lower base plate (501) set below the upper base plate (4). An edge-pressing strip (502) is embedded on the outer periphery of the lower base plate (501). Lifting rods (503) are connected to both sides of the bottom of the lower base plate (501). An inner bracket (504) is fixed inside the lower base plate (501). A torsion spring bracket (505) is fixedly installed on the inner wall of the central recess, and a support roller (506) is rotatably installed at the end of the torsion spring bracket (505). A pre-filter cotton (6) is sandwiched between the upper base plate (4) and the lower base plate (501), and the pre-filter cotton (6) is wrapped around the outer periphery of the unwinding roller (7). The unwinding roller (7) is fixedly installed on one side of the bottom of the filter chamber (3) by the bracket. The paint mist in the paint baking chamber (2) enters the filter chamber (3) through the upper base plate (4) under negative pressure and is intercepted by the fiber filter material of the pre-filter cotton (6). The pre-filter cotton (6) is pressed tightly against the bottom outer periphery of the upper base plate (4) by the pressure strip (502) on the top outer periphery of the lower base plate (501) to ensure the filtration area and sealing effect.

2. The multi-stage exhaust purification device for an environmentally friendly spray painting booth according to claim 1, characterized in that, A clutch winding assembly (8) is installed on the other side of the bottom of the filter chamber (3). The clutch winding assembly (8) includes a winding roller (801) fixedly installed on the other side of the bottom of the filter chamber (3) by a bracket. A key shaft (802) is coaxially fixed on the side end of the winding roller (801), and a sliding sleeve (803) is axially slidably installed on the outside of the key shaft (802). The sliding sleeve (803) is provided with a keyway that cooperates with the key protrusion on the outer periphery of the key shaft (802).

3. The multi-stage exhaust purification device for an environmentally friendly spray painting booth according to claim 2, characterized in that, The clutch and take-up assembly (8) also includes a driven disk (804) coaxially fixed to the end of the sliding sleeve (803). The driven disk (804) is driven by friction with the inner wall of the cavity of the drive disk (805). The drive disk (805) is fixedly connected to the rotating end of the motor (806). When the sliding sleeve (803) moves axially outside the key shaft (802) until the driven disk (804) engages with the drive disk (805), the transmission link between the motor (806) and the take-up roller (801) is established. Otherwise, the transmission link is disconnected.

4. The multi-stage exhaust purification device for an environmentally friendly spray painting booth according to claim 3, characterized in that, The clutch winding assembly (8) further includes an annular groove (807) radially arranged on the outer periphery of the sliding sleeve (803). A drive pin (808) is engaged inside the annular groove (807), and the drive pin (808) is fixedly connected to the axial end of the telescopic rod (809). The head end of the telescopic rod (809) is fixedly connected to the telescopic end of the electric cylinder (810).

5. The multi-stage exhaust purification device for an environmentally friendly spray painting booth according to claim 4, characterized in that, The filter chamber (3) is equipped with a linkage lifting assembly (9) at the bottom middle. The linkage lifting assembly (9) includes a support plate (901) fixedly installed at the bottom middle of the filter chamber (3). The support plate (901) has a bracket for installing a power cylinder (810) fixed on the outside of its side end. The support plate (901) has hanging plates (902) fixed at equal intervals along its long side on both sides.

6. The multi-stage exhaust purification device for an environmentally friendly spray painting booth according to claim 5, characterized in that, The linkage lifting assembly (9) also includes a V-shaped pin (903) rotatably installed on the inner side of the hanging plate (902). A transmission shaft (904) is installed at the rotation axis of the V-shaped pin (903), and the support plate (901) rotates in linkage with the V-shaped pins (903) on both sides through the transmission shaft (904).

7. The multi-stage exhaust purification device for an environmentally friendly spray painting booth according to claim 6, characterized in that, The linkage lifting assembly (9) also includes a trunnion (905) connected to one end of the V-pin (903). The trunnion (905) is arranged at equal intervals along the axis of the telescopic rod (809), and the linear motion of the telescopic rod (809) is converted into the oscillating motion of the V-pin (903) around the transmission shaft (904) through the trunnion (905).

8. The multi-stage exhaust purification device for an environmentally friendly spray painting booth according to claim 7, characterized in that, The linkage lifting assembly (9) also includes a slide groove (906) opened at the other end of the V-shaped pin (903). The slide groove (906) is slidably engaged with the bottom pin of the lifting rod (503), and the swaying motion of the V-shaped pin (903) is converted into the lifting motion of the lower base plate (501) through the engagement of the slide groove (906) and the lifting rod (503) to adjust the distance between the lower base plate (501) and the upper base plate (4).

9. The multi-stage exhaust purification device for an environmentally friendly spray painting booth according to claim 8, characterized in that, The machine body (1) has a device cavity (10) on its side, and a circulating fan (11) is fixedly installed at the bottom of the device cavity (10). The air inlet of the circulating fan (11) is connected to an air inlet pipe (12), and the end of the air inlet pipe (12) away from the air inlet of the circulating fan (11) is connected to an air inlet module (13). The air inlet module (13) is horizontally arranged at the bottom of the filter chamber (3), and the air inlet module (13) is located below the recess of the support plate (901).

10. The multi-stage exhaust purification device for an environmentally friendly spray painting booth according to claim 9, characterized in that, The outlet of the circulating fan (11) is connected to a post-filter (14), and the output end of the post-filter (14) is connected to an air outlet pipe (15). The end of the air outlet pipe (15) is connected to a heater (16), and the heater (16) is arranged at the top of the filter chamber (3) to heat the circulating air for easy drying of the paint surface.

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