A waste gas filtration and recovery device for paint production

Abstract

This invention relates to the field of waste gas treatment technology, and more particularly to a waste gas filtration and recovery device for paint production. The technical solution includes: a filter, a filter assembly, and an emission assembly, with the emission assembly located below the filter assembly. The filter assembly includes a fixed frame and a filter element rotatably mounted inside the filter via a torsion spring. The emission assembly includes a liquid collection box movable up and down below the fixed frame inside the filter, with a drain hole at the bottom. A pull rod is provided on the fixed frame, connected to the liquid collection box via a pull wire, causing the fixed frame to deflect when the liquid collection box moves downwards. Magnetic suction components are provided inside the filter and on the liquid collection box, adsorbing and holding the liquid collection box when it moves to the drain position. The drain hole is closed when the sealing plug is not at the drain position and opens when it reaches the drain position. This invention achieves automatic draining and filter element purging by linking the deflection of the fixed frame and the opening and closing of the drain hole with the gravity change of the liquid collection box, avoiding clogging, ensuring thorough draining, eliminating the need for electrical control, and improving safety.

Description

Technical Field

[0001] This invention relates to the field of waste gas treatment technology, and specifically to a waste gas filtration and recovery device for paint production. Background Technology

[0002] In the paint production process, the mixing, dispersion, grinding, and paint blending of raw materials generate waste gas containing liquid components. This waste gas often contains organic solvents, resin droplets, and paint mist particles. Direct emission not only results in raw material loss but also environmental pollution. Therefore, the waste gas treatment process in paint production typically requires the installation of filtration and recovery devices to intercept and recover the liquid components in the waste gas, while ensuring that the purified gas is used for subsequent treatment or emission. This stage places high demands on both the continuity and safety of production.

[0003] Currently, filtration-type gas-liquid separation devices are commonly used for the filtration and recovery of waste gas from paint production. The basic working principle involves passing the waste gas through a filter element, which uses the filter's interception and coalescence of liquid droplets to separate the liquid from the gas flow. The separated liquid is collected in a collection structure and then discharged through a drain port. Depending on the treatment requirements, some devices employ multi-stage filtration to progressively improve liquid recovery efficiency. Common filter element materials include metal mesh and fiber filter media. Discharge methods include manual periodic discharge, continuous discharge, or discharge controlled by valves.

[0004] The existing technology has the following technical problems in practical applications: 1. Some units rely on manual observation of liquid levels or draining liquid at fixed time intervals. When the liquid content in the waste gas fluctuates, untimely or excessively frequent drainage can easily occur. Untimely drainage leads to excessive liquid in the collection structure, which is easily carried back out by the airflow after the liquid level rises, reducing separation efficiency; excessively frequent drainage increases the operational burden and affects the stability of the unit's operation. The cause lies in the lack of a drainage control structure that directly acts based on the actual liquid accumulation. The consequence is poor unit adaptability and a large maintenance workload.

[0005] 2. During the filtration process, liquid droplets continuously adhere to and accumulate on the filter element surface. If the liquid cannot leave the filter element surface in time, it will gradually clog the filter pores, increasing airflow resistance and reducing filtration efficiency. Most existing devices lack a filter element cleaning structure linked to the filtration process, or require manual cleaning after shutdown, or rely on an external backflushing air source. This results in frequent filter element cleaning or replacement, affecting production continuity.

[0006] 3. When liquid is drained from the collection structure, the drainage rate is significantly affected by the liquid level and viscosity if relying solely on gravity. As the liquid level decreases, the drainage force gradually weakens, and liquid tends to remain at the bottom. This residual liquid occupies space for the next collection, reducing the effective volume of the collection structure; furthermore, long-term retention can lead to sedimentation or deterioration, clogging the drainage channels. This is caused by a lack of auxiliary pressurization for drainage or a structure that allows for complete liquid emptying. The consequences include frequent drainage triggering and increased maintenance difficulty.

[0007] 4. Some automatic drainage devices use electrical components such as level sensors, controllers, and electric valves to control drainage. In the waste gas environment of paint production, there may be flammable and explosive organic gases. Electrical components may generate electrical sparks or experience surface temperature increases during operation, requiring additional design according to explosion-proof requirements. After long-term operation, electrical components may also fail. This not only increases equipment costs but also affects the safety of the device in the operating environment.

[0008] Therefore, how to provide a waste gas filtration and recovery device for paint production is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0009] To address the shortcomings of existing technologies, this invention provides a waste gas filtration and recovery device for paint production, which solves the problems mentioned in the background art.

[0010] The solution of the present invention to the above-mentioned technical problems is as follows: The present invention provides a waste gas filtration and recovery device for paint production, including a filter, a filter assembly and an emission assembly, wherein the filter assembly and the emission assembly are installed inside the filter, and the emission assembly is located below the filter assembly; The filter assembly includes a fixed frame and a filter element mounted on the fixed frame. The fixed frame is rotatably mounted inside the filter by a torsion spring. The discharge assembly includes a liquid collection box, which is movably installed inside the filter and located below the fixed frame. The bottom of the liquid collection box is provided with a drain hole. The fixed frame is equipped with a pull rod, which is connected to the liquid collection box via a pull line, so that the fixed frame can be deflected when the liquid collection box moves downward. The filter is equipped with a first magnet, and the liquid collection box is equipped with a second magnet. When the liquid collection box moves downward to the drain position, the second magnet attracts the first magnet, keeping the liquid collection box in the drain position. The discharge assembly also includes a sealing plug for opening and closing the drain hole. When the collection box is not moved to the drain position, the sealing plug closes the drain hole; when the collection box is moved to the drain position, the sealing plug opens the drain hole.

[0011] Based on the above technical solution, the present invention can be further improved as follows.

[0012] Furthermore, the filter is provided with connecting flanges at both ends, and the filter is installed between pipelines through the connecting flanges; the bottom end of the filter is provided with a drain pipe, and the liquid discharged from the drain hole is discharged through the drain pipe at the bottom of the filter.

[0013] The beneficial effects of adopting the above-mentioned further solutions are: The connecting flange allows the filter to be quickly connected to existing pipelines, facilitating installation and disassembly. The drain pipe centrally discharges liquid from the drain hole, preventing liquid accumulation at the bottom of the filter, ensuring a smooth drainage process, and facilitating the unified collection and treatment of recovered liquid.

[0014] Furthermore, the filter assembly also includes two partitions, with a fixing frame located directly above and between the two partitions; the discharge assembly is located directly below the fixing frame.

[0015] The beneficial effects of adopting the above-mentioned further solutions are: The baffle provides clear installation space for the fixed frame and discharge components, allowing the liquid trapped by the filter element to fall accurately into the collection box below, reducing liquid splashing or deviation, ensuring a stable liquid collection path, and improving the orderliness of gas-liquid separation.

[0016] Furthermore, the discharge assembly also includes a support plate, which is installed between two partitions; a limit rod is installed on the support plate by a spring, and a sealing plug is located at the bottom end of the limit rod; the sealing plug is pressed against the drain hole by a spring, and when the collection box moves down to the drain position, the sealing plug disengages from the drain hole.

[0017] The beneficial effects of adopting the above-mentioned further solutions are: The support plate provides a fixed fulcrum for the limit rod and spring. The spring keeps the sealing plug pressed against the drain hole until the collection box reaches the drain position, preventing premature liquid leakage. After the collection box moves to its limit position, the sealing plug separates from the drain hole, and the drain hole opens automatically. The draining action is mechanically linked to the position of the collection box, requiring no additional control and ensuring a reliable structure.

[0018] Furthermore, the liquid collection box is provided with limiting shafts on both sides, and the filter is provided with a sliding groove. The liquid collection box is installed on the filter by moving up and down through the cooperation of the limiting shafts and the sliding groove. The pull rod is installed at one end of the fixed frame located outside the filter, and the pull rod is fixed to the limiting shaft by a pull line.

[0019] The beneficial effects of adopting the above-mentioned further solutions are: The limiting shaft and the sliding groove cooperate to provide linear movement guidance for the collection box, ensuring smooth up-and-down movement and preventing skewing or jamming. A cable transmits the displacement of the collection box to the pull rod and the fixed frame, achieving mechanical linkage between the weight change of the collection box and the deflection of the fixed frame. The transmission path is simple, and the action response is direct.

[0020] Furthermore, the filter element has its filter surface facing the air inlet end, and the filter element is normally inclined to guide the air inlet to the top of the filter; the top of the filter is arc-shaped corresponding to the fixed frame, which is used to buffer the airflow and facilitate the deflection of the fixed frame.

[0021] The beneficial effects of adopting the above-mentioned further solutions are: The angled design of the filter element allows trapped droplets to flow quickly downwards along its surface into the collection box, reducing droplet retention and the risk of clogging. The filter surface facing the air inlet facilitates direct droplet collision and trapping. The arc-shaped structure at the top of the filter buffers and guides the incoming airflow, reducing local flow resistance and providing space for the fixed frame to deflect, preventing movement interference.

[0022] Furthermore, the bottom outer surface of the liquid collection box is provided with the second magnet, and the first magnet is provided inside the filter corresponding to the second magnet; when the liquid collection box moves to its limit, the second magnet and the first magnet attract each other, so that the liquid collection box is limited to the bottom of the filter.

[0023] The beneficial effects of adopting the above-mentioned further solutions are: The magnetic attraction temporarily secures the collection box when it reaches the drain position, preventing it from being prematurely pulled back by the torsion spring due to the decrease in liquid weight during draining. This ensures the sealing plug remains separated from the drain hole, keeping the drain channel unobstructed and guaranteeing complete emptying of the collection box, minimizing residue.

[0024] Furthermore, after the fixed frame deflects, it guides the airflow to the collection box. The airflow purifies the filter element, blowing off the liquid adhering to the filter element. At the same time, the airflow guided by the filter element increases the air pressure in the collection box. After the collection box is drained, the torsion spring force of the fixed frame overcomes the gravity of the collection box and the magnetic force between the first magnet and the second magnet, lifting the collection box back to its original position. The fixed frame automatically resets through the torsion spring force.

[0025] The beneficial effects of adopting the above-mentioned further solutions are: The deflection of the fixed frame changes the airflow direction, creating a backflushing effect on the filter element to clear the liquid, reducing the continuous accumulation of liquid on the filter element surface and extending the filter element's service life. After the airflow enters the collection box, it increases the internal pressure. During drainage, the liquid is subjected to the combined effects of gravity and air pressure, increasing the drainage speed and reducing residue. After drainage is complete, the torsion spring force automatically returns the collection box and fixed frame to their initial positions, allowing the device to resume operation without external power and achieve continuous cycle operation.

[0026] Therefore, the waste gas filtration and recovery device for paint production provided by this invention has the following beneficial effects: I. This invention achieves automatic liquid collection and discharge through the cooperation of a liquid collection box, a fixed frame torsion spring, a pull wire, a sealing plug, and a first and second magnet. When the liquid in the collection box reaches a certain weight, it moves downwards, opening the drain hole. After the liquid is emptied, the restoring force of the torsion spring causes the collection box to automatically reset, and the drain hole closes again. Before the collection box reaches the drain position, the sealing plug remains pressed firmly against the drain hole to prevent premature leakage. During the draining process, the magnetic attraction prevents the collection box from prematurely resetting, ensuring complete emptying of the liquid. The entire process requires no manual operation, solving the problem of existing devices requiring shutdown or manual draining, and the device can operate continuously.

[0027] Second, this invention utilizes a pull rod pulled by a cable as the collection box moves downwards, causing the fixing frame to deflect and altering the airflow direction. This directs the airflow towards the filter element surface, blowing off the liquid adhering to the filter element and carrying it into the collection box, thus delaying filter element clogging and extending its service life. Simultaneously, the airflow from the deflected fixing frame enters the collection box, increasing the internal air pressure. Once the drain hole opens, the liquid is discharged under the combined action of gravity and internal air pressure, increasing the drainage speed, reducing liquid residue, and making the drainage process more thorough.

[0028] Third, this invention tilts the filter element in its normal operating state, with the filter surface facing the air inlet direction, allowing trapped droplets to quickly flow downwards along the filter element surface into the collection box, reducing droplet retention on the filter element surface. The top of the filter is arc-shaped to buffer the incoming airflow, reducing local flow resistance, minimizing secondary entrainment of droplets by the airflow, and improving gas-liquid separation and liquid recovery efficiency.

[0029] IV. This invention employs mechanical weight sensing and a pull-wire, torsion spring, and magnetic attraction structure to control liquid discharge. It eliminates the need for electric sensors, controllers, or actuators, thus eliminating the risk of ignition from electrical sparks in flammable and explosive gas environments, thereby enhancing the inherent safety of the equipment. The filters are equipped with connecting flanges at both ends, allowing for individual pipe connections or the installation of multiple filters in series as needed. Each filter independently traps droplets and automatically discharges liquid; multi-stage series connection enables step-by-step separation of liquid from the waste gas, improving overall liquid recovery capacity and treatment efficiency. Attached Figure Description

[0030] The accompanying drawings, which are provided to further illustrate the invention and constitute a part of this invention, are illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention.

[0031] In the attached diagram: Figure 1 This is a schematic diagram of the main appearance of the present invention; Figure 2 This is a bottom view of the present invention; Figure 3 This is a schematic diagram of the internal structure of the present invention from the front view. Figure 4 This is a schematic diagram of the fixed frame and liquid collection box in their normal state according to the present invention; Figure 5 This is a schematic diagram of the internal structure of the present invention in the draining state; Figure 6 This is a schematic diagram of the deflection state structure of the fixed frame and the liquid collection box according to the present invention; Figure 7 This is a schematic diagram showing the assembly state of the partition and the liquid collection box according to the present invention; Figure 8 This is a bottom view of the liquid collection box structure of the present invention; Figure 9 This is a schematic diagram of the filter element deflection process of the present invention.

[0032] The attached diagram lists the components represented by each number as follows: 1. Filter; 101. Connecting flange; 102. Drain pipe; 103. First magnet; 2. Filter assembly; 201. Partition plate; 202. Pull rod; 203. Filter element; 204. Fixing frame; 3. Discharge assembly; 301. Limiting rod; 302. Collection box; 303. Spring; 304. Sealing plug; 305. Second magnet; 306. Support plate; 307. Limiting shaft; 308. Drain hole. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Please see Figures 1 to 9 As shown, the embodiments provided by the present invention are as follows: Example 1 This embodiment provides a waste gas filtration and recovery device for paint production, including a filter 1, a filter assembly 2, and an emission assembly 3. Both the filter assembly 2 and the emission assembly 3 are installed inside the filter 1, with the emission assembly 3 located below the filter assembly 2.

[0035] Filter 1 has a cylindrical structure. Both ends of filter 1 are equipped with connecting flanges 101, which are used to connect filter 1 to the exhaust gas conveying pipeline. The bottom end of filter 1 is equipped with a drain pipe 102, which connects to the bottom interior of filter 1. A first magnet 103 is fixed to the inner wall of filter 1 near the bottom.

[0036] The filter assembly 2 includes a partition 201, a pull rod 202, a filter element 203, and a fixing frame 204. Two partitions 201 are fixed to both sides of the inner wall of the filter 1, forming an installation space between them. The fixing frame 204 is located directly above the space between the two partitions 201. Both sides of the fixing frame 204 are rotatably connected to the inner wall of the filter 1 via torsion springs, allowing the fixing frame 204 to deflect around the axis of the torsion springs. One end of the torsion spring shaft of the fixing frame 204 extends out of the outer wall of the filter 1, and the pull rod 202 is fixedly installed at the extended end. The filter element 203 is installed inside the fixing frame 204, with its filter surface facing the direction of exhaust gas inflow; under normal conditions, the filter element 203 is tilted.

[0037] The discharge assembly 3 includes a limiting rod 301, a collection box 302, a spring 303, a sealing plug 304, a second magnet 305, a support plate 306, a limiting shaft 307, and a discharge hole 308. The support plate 306 is elongated and fixed at both ends between two partitions 201. A hole is opened in the middle of the support plate 306, through which the limiting rod 301 passes. A spring 303 is installed between the upper end of the limiting rod 301 and the support plate 306, and a sealing plug 304 is fixed to the bottom end of the limiting rod 301. The width of the support plate 306 is smaller than the width of the top opening of the collection box 302, allowing liquid to bypass the support plate 306 and fall into the collection box 302. The collection box 302 has a top-opening structure and is installed directly below the filter assembly 2. Limiting shafts 307 are fixed to both sides of the collection box 302. The filter 1 has grooves on both sides of its inner wall. A limiting shaft 307 is inserted into the grooves, with its end extending out of the outer wall of the filter 1. The collection box 302 moves up and down along the grooves via the limiting shaft 307. A pull rod 202 is connected to the extended end of the limiting shaft 307 via a pull wire, which is kept taut between the pull rod 202 and the limiting shaft 307. The collection box 302 has a drain hole 308 at its bottom. A sealing plug 304 is located above the drain hole 308 and is pressed against the drain hole 308 by a spring 303. A second magnet 305 is fixed to the outer surface of the bottom of the collection box 302, and the second magnet 305 is vertically aligned with the first magnet 103.

[0038] Example 2 This embodiment further defines the preferred parameters and additional structures based on Embodiment 1.

[0039] This angle range ensures that the trapped liquid flows smoothly down the surface of the filter element 203 into the collection box 302, while maintaining sufficient filtration area to reduce airflow resistance. The deflected fixing frame 204 can concentrate and guide the airflow to the lower part of the filter element 203 and the top opening of the collection box 302.

[0040] The lower end of the sealing plug 304 is conical, and the upper end of the drain hole 308 is a matching conical opening to improve sealing reliability.

[0041] Both the first magnet 103 and the second magnet 305 are neodymium iron boron permanent magnets. The attractive force when they are attracted together should be less than the restoring force of the torsion spring of the fixed frame 204 in the deflected state, and greater than the weight of the collection box 302 when it is empty, so as to ensure that the collection box 302 will not prematurely reset during the drainage process. The total weight of the collection box 302 when it is full of liquid should be greater than the initial holding force of the torsion spring of the fixed frame 204, so as to ensure that the collection box 302 can smoothly begin to move downward.

[0042] The grooves on both sides of the inner wall of filter 1 are vertical elongated grooves, the length of which is the same as the vertical movement stroke of the liquid collection box 302. Limiting blocks are provided at both ends of the grooves to prevent the limiting shaft 307 from dislodging from the groove. The top inner wall of filter 1, corresponding to the fixed frame 204, has an arc-shaped structure. This arc-shaped structure buffers the airflow, reduces airflow resistance, and provides space for the fixed frame 204 to deflect.

[0043] Example 3 This embodiment provides several alternative implementation methods.

[0044] The pull cord can be replaced with a connecting rod. The two ends of the connecting rod are hinged to the pull rod 202 and the limiting shaft 307, respectively. When the collection box 302 moves downwards, the connecting rod directly pushes the pull rod 202, causing the fixed frame 204 to deflect. Using a connecting rod structure provides better transmission rigidity and avoids the problem of the pull cord elongating or breaking after long-term use.

[0045] At least one of the first magnet 103 and the second magnet 305 can be replaced with an electromagnet. For example, the second magnet 305 is an electromagnet, and the first magnet 103 is a ferromagnetic block. By switching the electromagnet on and off, the locking and unlocking of the liquid collection box 302 can be actively controlled, thereby realizing timed or manual liquid drainage.

[0046] Spring 303 can be replaced with an elastic rubber column or a gas spring.

[0047] In addition to a conical structure, the sealing plug 304 can also adopt a ball valve core or a flat valve plate structure. The ball valve core and the drain hole 308 are sealed by a spherical surface, while the flat valve plate covers the upper end face of the drain hole 308 to achieve a seal.

[0048] A valve can also be installed on the drain pipe 102.

[0049] Example 4 This embodiment illustrates the combined use of multiple filters.

[0050] In the exhaust gas treatment pipeline, multiple filters 1 can be installed in series. Each filter 1 is connected to an adjacent pipeline or adjacent filter through connecting flanges 101 at both ends. Multiple filters 1 can intercept droplets of different particle sizes, thereby improving the overall recovery efficiency.

[0051] The drain pipe 102 of each filter 1 can be connected to the same main collection pipe, which centrally transports the recovered liquid to the storage tank. Each filter 1 independently completes the liquid collection and automatic draining operations without affecting each other.

[0052] The filter element 203 is detachable. An openable top cover or side latches can be installed on the fixing frame 204, allowing operators to open the fixing frame 204 and remove the filter element 203 for cleaning or replacement. An inspection port can also be provided on the side wall of the filter 1; this port is normally sealed and closed, but opens during maintenance.

[0053] Working principle: The device is connected to the waste gas delivery pipeline via connecting flanges 101 at both ends of the filter 1. Multiple filters 1 can be installed in series on the pipeline as needed. The filter 1 contains a filter assembly 2 and a discharge assembly 3, with the discharge assembly 3 located below the filter assembly 2. A drain pipe 102 is installed at the bottom of the filter 1 to discharge the separated liquid.

[0054] The filter assembly 2 includes a fixed frame 204 and a filter element 203. The fixed frame 204 is installed inside the filter 1 by a torsion spring, and the filter element 203 is fixed on the fixed frame 204. The filter element 203 is normally tilted, with the filter surface facing the side where the exhaust gas enters. The discharge assembly 3 includes a liquid collection box 302, which is located below the fixed frame 204 and can move up and down along a groove on the inner wall of the filter 1. Limiting shafts 307 are provided on both sides of the liquid collection box 302, and the limiting shafts 307 are inserted into the groove. A pull rod 202 is mounted on the fixed frame 204, and the pull rod 202 is connected to the limiting shaft 307 by a pull line. A drain hole 308 is opened at the bottom of the liquid collection box 302, and a sealing plug 304 is correspondingly provided above the drain hole 308. The sealing plug 304 is installed on a support plate 306 by a limiting rod 301 and a spring 303, and the support plate 306 is fixed between two partitions 201. Two partitions 201 are disposed inside the filter 1, and a fixing frame 204 is located directly above and between the two partitions 201. A first magnet 103 is provided inside the filter 1, and a second magnet 305 is provided at the bottom of the collection box 302.

[0055] After entering filter 1, the exhaust gas first passes through filter element 203. Filter element 203 is inclined, with its filter surface facing the air inlet direction. Filter element 203 traps liquid droplets in the exhaust gas and simultaneously directs the airflow towards the top of filter 1. The top of filter 1 is arc-shaped, where the airflow is briefly buffered. The gas continues to pass through filter element 203 and is discharged from the outlet. The trapped liquid flows downwards along the surface of filter element 203 into collection box 302.

[0056] As the liquid in the collection box 302 increases, its total weight gradually increases. When the liquid weight exceeds the supporting force of the torsion spring in the fixed frame 204, the collection box 302 begins to move downwards. The collection box 302 moves smoothly downwards along the slide groove, with the limiting shaft 307 acting as a guide. As the collection box 302 moves downwards, the pull rod 202 is pulled by the pull line, causing the fixed frame 204 to rotate around the torsion spring, and the filter element 203 changes its angle accordingly.

[0057] After the fixed frame 204 deflects, the airflow is directed towards the liquid collection box 302. The airflow blows across the inclined surface of the filter element 203, blowing off the liquid adhering to the filter element 203 and carrying it into the liquid collection box 302. At the same time, the airflow increases the air pressure inside the liquid collection box 302.

[0058] Before the collection box 302 reaches its lowest position, the sealing plug 304, under the elastic force of the spring 303, presses against the drain hole 308, keeping the drain hole 308 closed. The liquid inside the collection box 302 will not leak prematurely. When the collection box 302 reaches its lowest position, the second magnet 305 engages with the first magnet 103, fixing the collection box 302 to the bottom of the filter 1. At this time, the sealing plug 304 separates from the drain hole 308, and the drain hole 308 opens. Under the influence of gravity and internal air pressure, the liquid inside the collection box 302 drains through the drain hole 308 to the bottom of the filter 1, and then exits the device through the drain pipe 102.

[0059] After the liquid is drained, the weight of the collection box 302 is significantly reduced. The restoring force of the torsion spring in the fixing frame 204 is transmitted to the collection box 302 via a pull wire. This restoring force is greater than the weight of the collection box 302 itself and the magnetic attraction force, so the collection box 302 is pulled upwards. After the collection box 302 is reset, the fixing frame 204 returns to its initial tilted position under the action of the torsion spring. The sealing plug 304 presses down on the drain hole 308 again, closing the drain hole 308. The device returns to its initial state, awaiting the next round of liquid collection and discharge.

[0060] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the scope of the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0061] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A waste gas filtration and recovery device for paint production, comprising a filter (1), a filter assembly (2), and an emission assembly (3), wherein the filter assembly (2) and the emission assembly (3) are installed inside the filter (1), and the emission assembly (3) is located below the filter assembly (2), characterized in that: The filter assembly (2) includes a fixed frame (204) and a filter element (203) mounted on the fixed frame (204). The fixed frame (204) is rotatably mounted inside the filter (1) by a torsion spring. The discharge assembly (3) includes a liquid collection box (302), which is movably installed in the filter (1) and located below the fixed frame (204). The bottom of the liquid collection box (302) is provided with a drain hole (308). The fixed frame (204) is provided with a pull rod (202), which is connected to the liquid collection box (302) via a pull wire, so that the fixed frame (204) can be deflected when the liquid collection box (302) moves downward; The filter (1) is provided with a first magnet (103), and the collection box (302) is provided with a second magnet (305). When the collection box (302) moves downward to the drain position, the second magnet (305) attracts the first magnet (103) and keeps the collection box (302) in the drain position. The discharge assembly (3) also includes a sealing plug (304) for opening and closing the drain hole (308). When the collection box (302) is not moved to the drain position, the sealing plug (304) closes the drain hole (308); when the collection box (302) is moved to the drain position, the sealing plug (304) opens the drain hole (308).

2. The waste gas filtration and recovery device for paint production according to claim 1, characterized in that: The filter (1) is provided with connecting flanges (101) at both ends, and the filter (1) is installed between pipelines through the connecting flanges (101); the bottom end of the filter (1) is provided with a drain pipe (102), and the liquid discharged from the drain hole (308) is discharged through the drain pipe (102) at the bottom end of the filter (1).

3. The waste gas filtration and recovery device for paint production according to claim 1, characterized in that: The filter assembly (2) also includes a partition (201), there are two partitions (201), and the fixing frame (204) is located directly above the two partitions (201); the discharge assembly (3) is located directly below the fixing frame (204).

4. The waste gas filtration and recovery device for paint production according to claim 3, characterized in that: The discharge assembly (3) also includes a support plate (306), which is installed between two partitions (201). A limit rod (301) is installed on the support plate (306) by a spring (303), and a sealing plug (304) is located at the bottom of the limit rod (301). The sealing plug (304) is pressed against the drain hole (308) by the spring (303). When the collection box (302) moves down to the drain position, the sealing plug (304) disengages from the drain hole (308).

5. The waste gas filtration and recovery device for paint production according to claim 1, characterized in that: The liquid collection box (302) is provided with limiting shafts (307) on both sides, and the filter (1) is provided with a sliding groove. The liquid collection box (302) is installed on the filter (1) in a way that allows it to move up and down through the cooperation of the limiting shafts (307) and the sliding groove. The pull rod (202) is installed at one end of the fixed frame (204) located outside the filter (1), and the pull rod (202) is fixed to the limiting shafts (307) by a pull line.

6. The waste gas filtration and recovery device for paint production according to claim 1, characterized in that: The filter surface of the filter element (203) faces the air inlet end. The filter element (203) is normally inclined to guide the air inlet to the top of the filter (1). The top of the filter (1) is arc-shaped, which is used to buffer the airflow and facilitate the deflection of the fixed frame (204).

7. The waste gas filtration and recovery device for paint production according to claim 5, characterized in that: The bottom outer surface of the liquid collection box (302) is provided with the second magnet (305), and the filter (1) is provided with the first magnet (103) corresponding to the second magnet (305); when the liquid collection box (302) moves to the limit, the second magnet (305) and the first magnet (103) attract each other, so that the liquid collection box (302) is limited to the bottom of the filter (1).

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