Pass-type paint spray booth anti-pollution device

Abstract

The utility model relates to the technical field of paint spray booths, and one embodiment of the utility model provides a pass-type paint spray booth anti-pollution device which comprises a paint spray booth body, a door is arranged on the side wall of the paint spray booth body, an anti-pollution air supply assembly is arranged on the paint spray booth body, and a dispersed air outlet assembly is arranged in the paint spray booth body; the anti-pollution air supply assembly comprises an air inlet cover, a disinfectant fluid cavity is formed in the anti-pollution box, and one end of the extension pipe is inserted into the disinfectant fluid cavity. According to the technical scheme, the core problems of low purification efficiency, high maintenance cost and large environmental protection risk in the existing through-type paint spray booth pollution control in the prior art are solved, most paint spray booths adopt a top single air inlet and bottom air exhaust mode, eddy current is easily formed behind workpieces, the paint mist residence time is as long as more than 2 minutes, and the paint spray quality is improved. The spraying uniformity is influenced, and the contact dosage of an operator is also increased; a traditional air curtain machine cannot form a complete air curtain due to uneven airflow distribution, and paint mist is prone to leaking from the side face of a room body.

Description

Technical Field

[0001] The embodiments disclosed herein relate to the field of spray booth technology, and more specifically, to a pollution prevention device for a through-type spray booth. Background Technology

[0002] In industries such as machinery manufacturing, automotive painting, and furniture production, walk-through spray booths are widely used due to their continuous operation and high efficiency. Their working principle involves conveying workpieces into the booth via a conveyor belt, where spray guns apply the coating. Effective control of paint mist and volatile organic compounds (VOCs) is necessary to meet occupational health and safety and environmental protection requirements. Currently, the core problems in pollution control of existing walk-through spray booths are low purification efficiency, high maintenance costs, and significant environmental risks. Most spray booths use a top-mounted single-inlet and bottom-exhaust system, which easily creates vortices behind the workpieces, resulting in paint mist retention times exceeding 2 minutes. This not only affects the uniformity of the coating but also increases the exposure dose for operators. Traditional air curtain machines, due to uneven airflow distribution, cannot form a complete air curtain, allowing paint mist to easily leak from the sides of the booth.

[0003] Therefore, a pollution prevention device for a pass-through spray booth was developed. Utility Model Content

[0004] To overcome the above-mentioned defects, the embodiments of this disclosure provide a pollution prevention device for a through-type spray booth, which solves the core problems of low purification efficiency, high maintenance cost and high environmental risk in the pollution control of existing through-type spray booths. Most spray booths adopt a top single air inlet and bottom exhaust mode, which easily forms vortices behind the workpiece, resulting in paint mist retention time of more than 2 minutes, which not only affects the uniformity of spraying, but also increases the exposure dose to operators. Traditional air curtain machines cannot form a complete air curtain due to uneven airflow distribution, and paint mist is prone to leak from the side of the booth.

[0005] According to one aspect, at least one embodiment of this disclosure provides a pollution prevention device for a through-type spray booth, comprising:

[0006] A spray booth body, wherein a door is provided on the side wall of the spray booth body;

[0007] A pollution-proof air supply component is installed on the paint booth body;

[0008] A dispersed air outlet assembly is disposed inside the paint spray booth body;

[0009] The pollution prevention air supply assembly includes an air inlet hood, which is disposed on the upper surface of the spray booth. An air inlet pipe is disposed at the upper end of the air inlet hood, and one end of the air inlet pipe is connected to a pollution prevention box. The pollution prevention box is disposed on the spray booth, and an air outlet is disposed at the lower end of the pollution prevention box. The air outlet is inserted into the interior of the spray booth. An air pump is disposed inside the air inlet hood and is connected to the air inlet pipe. An extension pipe is disposed at the end of the air inlet pipe. A disinfection water chamber is disposed inside the pollution prevention box, and one end of the extension pipe is inserted into the disinfection water chamber.

[0010] As a further technical solution, a blower is provided inside the air outlet of the pollution prevention box, an air inlet is provided on the side wall of the air inlet cover, and a filter cotton layer is provided inside the air inlet cover.

[0011] As a further technical solution, the dispersed air outlet assembly includes an air outlet pipe, which is disposed at the inner top of the paint booth and fitted onto the air outlet. An air guide pipe is disposed inside the air outlet pipe and is connected to the air outlet. Air supply pipes are disposed on opposite side walls of the air guide pipe, and an air curtain machine is connected to the end of the air supply pipe. The air curtain machine is disposed on the inner side wall of the paint booth.

[0012] As a further technical solution, a flow divider is provided on the inner wall of the air duct, and the flow divider is spliced ​​with the bottom surface of the air supply duct.

[0013] As a further technical solution, the upper surface of the anti-pollution box has an operating port, and a sealing buckle is connected to the operating port by a pin. The side wall of the anti-pollution box has a water outlet, which is located on the side wall of the disinfection water chamber.

[0014] As a further technical solution, the number of filter cotton layers is several, and the multiple filter cotton layers are arranged in an orderly manner inside the air inlet hood.

[0015] As a further technical solution, the side wall of the air duct is provided with a plug-in pad, and the plug-in pad is sealed and fitted to the paint spray booth body.

[0016] As a further technical solution, an air outlet is provided at the lower end of the air duct, and the air duct is installed inside the paint booth.

[0017] As a further technical solution, the interior of the pollution prevention box is provided with a mounting plate, and the air duct is connected to the mounting plate.

[0018] As a further technical solution, exhaust fans are installed on both sides of the interior bottom surface of the spray booth and at the door, and a wind compressor is connected to the air inlet on the air inlet hood.

[0019] The beneficial effects of the embodiments disclosed herein are as follows:

[0020] 1. In this disclosure, the design of the extension tube immersing the disinfectant water chamber allows the air and disinfectant water to come into full contact (contact time ≥2 seconds). Utilizing the principle of droplet inertial collision, the removal rate of paint mist particles ≥1μm can reach more than 95%, which is significantly improved compared to traditional single filter cotton.

[0021] 2. In this disclosure, the residence time of paint mist in the chamber is shortened from more than 2 minutes in the traditional mode to less than 30 seconds, reducing the secondary adhesion of paint mist on the workpiece surface and improving the smoothness and gloss of the coating; at the same time, the stable airflow field can reduce the fluctuation of paint output from the spray gun and save paint consumption. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments of this disclosure will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this disclosure and these drawings without any creative effort.

[0023] Figure 1 This is a schematic diagram of a structure in one embodiment of the present disclosure;

[0024] Figure 2 This is a cross-sectional view of the air inlet shroud disclosed herein;

[0025] Figure 3 This is a cross-sectional view of the spray booth structure disclosed herein;

[0026] Figure 4 This is a cross-sectional view of the air outlet duct disclosed herein;

[0027] In the diagram: 1. Spray booth body; 2. Door; 3. Anti-pollution air supply assembly; 3-1. Air inlet hood; 3-2. Air inlet duct; 3-3. Anti-pollution box; 3-4. Air outlet; 3-5. Air pump; 3-6. Extension pipe; 3-7. Disinfectant water chamber; 3-8. Air blower; 3-9. Air inlet; 3-10. Filter cotton layer; 4. Dispersed air outlet assembly; 4-1. Air outlet duct; 4-2. Air guide duct; 4-3. Air supply duct; 4-4. Air curtain machine; 4-5. Diverter hood; 5. Operating port; 6. Sealing cover; 7. Water outlet; 8. Insertion pad; 9. Air supply outlet; 10. Mounting plate; 11. Exhaust fan; 12. Air compressor. Detailed Implementation

[0028] The present disclosure will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present disclosure and are not intended to limit the scope of the disclosure.

[0029] To keep the drawings concise, each drawing only schematically shows the parts relevant to the disclosure; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0030] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0031] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0032] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0033] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0034] like Figures 1-4 As shown, it illustrates a pollution prevention device for a through-type spray booth according to this disclosure, comprising:

[0035] The spray booth body 1 has a door 2 on its side wall;

[0036] Pollution-proof air supply component 3 is installed on the paint booth body 1;

[0037] Dispersed air outlet component 4 is installed inside the paint spray booth body 1;

[0038] The anti-pollution air supply component 3 includes an air inlet hood 3-1, which is located on the upper surface of the paint booth body 1. An air inlet pipe 3-2 is located at the upper end of the air inlet hood 3-1. One end of the air inlet pipe 3-2 is connected to an anti-pollution box 3-3, which is located on the paint booth body 1. An air outlet 3-4 is located at the lower end of the anti-pollution box 3-3 and is inserted into the interior of the paint booth body 1. An air pump 3-5 is located inside the air inlet hood 3-1 and is connected to the air inlet pipe 3-2. An extension pipe 3-6 is located at the end of the air inlet pipe 3-2. A disinfection water chamber 3-7 is located inside the anti-pollution box 3-3, and one end of the extension pipe 3-6 is inserted into the interior of the disinfection water chamber 3-7.

[0039] The dispersed air outlet assembly 4 includes an air outlet 4-1, which is located at the top inside the paint booth 1. The air outlet 4-1 is fitted onto the air outlet 3-4. An air guide 4-2 is installed inside the air outlet 4-1 and is connected to the air outlet 3-4. Air supply pipes 4-3 are installed on the opposite side walls of the air guide 4-2. An air curtain machine 4-4 is connected to the end of the air supply pipe 4-3. The air curtain machine 4-4 is located on the inner side wall of the paint booth 1.

[0040] In some examples, a door 2 is installed on the side wall of the spray booth 1. The door 2 can be an automatic sensor door or a manual sliding door. If an automatic sensor door is used, it needs to be equipped with a sensor that automatically opens when an object is detected approaching, facilitating the entry and exit of workpieces from the spray booth 1. For manual sliding doors, it is necessary to ensure that the track is smooth and easy to push, and that the door and the booth body are well sealed. This can be achieved by installing a sealing strip to prevent paint mist leakage during the spraying process. The frame of the spray booth 1 is made of a sturdy metal material, such as stainless steel or high-strength aluminum alloy. The welded joints must be strong to ensure the booth can withstand various external forces and internal airflow pressure. The inner wall of the booth can be made of corrosion-resistant and smooth materials, such as epoxy-coated steel plates, to facilitate the cleaning of adhering paint mist. The air inlet hood 3-1 is fixed to the upper surface of the paint booth 1, and can be connected by bolts or welding to ensure a firm and sealed connection. The upper end of the air inlet hood 3-1 is connected to the air inlet pipe 3-2. The connection between the air inlet pipe 3-2 and the air inlet hood 3-1 must be sealed, which can be done using sealant or rubber sealing rings. The other end of 2 is connected to the anti-pollution box 3-3, ensuring a tight connection to prevent air leakage. An air pump 3-5 is installed inside the air inlet hood 3-1. The power of the air pump 3-5 should be selected according to the size of the paint booth 1 and the required air volume. The air pump 3-5 is connected to the air inlet pipe 3-2. After starting the air pump 3-5, outside air is drawn into the air inlet pipe 3-2. The air pump 3-5 can be controlled by an electronic control system, setting different wind speed levels to adapt to different painting operation needs. The anti-pollution box 3-3 is installed in the paint booth. The body 1 can be fixed by hanging or bracket support. The anti-pollution box 3-3 is equipped with a disinfection water chamber 3-7. One end of the extension tube 3-6 is inserted into the disinfection water chamber 3-7. The length of the extension tube 3-6 should be appropriate to ensure that it can penetrate into the disinfection water chamber 3-7 to a certain depth so that the air is fully purified when passing through the disinfection water. The lower end of the anti-pollution box 3-3 is equipped with an air outlet 3-4. The air outlet 3-4 is inserted into the interior of the spray booth body 1. The connection between the air outlet 3-4 and the spray booth body 1 should also be sealed.

[0041] The air outlet duct 4-1 is installed inside the top of the paint booth 1 and fitted onto the air outlet 3-4. The air outlet duct 4-1 and the air outlet 3-4 must be sealed together, which can be done using sealant or a sealing ring. An air guide duct 4-2 is installed inside the air outlet duct 4-1 and is connected to the air outlet 3-4. The connection method must ensure that the airflow can pass through smoothly. Air supply ducts 4-3 are installed on the opposite side walls of the air guide duct 4-2. The connection between the air supply duct 4-3 and the air guide duct 4-2 must be firm and sealed, which can be done by welding or using special pipe fittings. The air curtain machine 4-4 is connected to the end of the air supply duct 4-3 and is installed on the inner side wall of the paint booth 1. The installation height and angle of the air curtain machine 4-4 should be adjusted according to the actual situation of the paint booth 1 to ensure that the blown air curtain can effectively block the diffusion of paint mist.

[0042] like Figures 1-4 As shown in the figure, this embodiment proposes that the air outlet 3-4 inside the pollution prevention box 3-3 is equipped with a blower 3-8, the side wall of the air inlet hood 3-1 is equipped with an air inlet 3-9, and the inside of the air inlet hood 3-1 is equipped with a filter cotton layer 3-10.

[0043] In some examples, a blower 3-8 is installed inside the air outlet 3-4 inside the anti-pollution box 3-3. The blower 3-8 is used to accelerate the entry of purified air into the paint booth 1. Its power and blowing direction should be adjusted according to the airflow distribution inside the paint booth 1. An air inlet 3-9 is set on the side wall of the air inlet hood 3-1. A filter cotton layer 3-10 is installed at the air inlet 3-9. The filter cotton layer 3-10 can be made of multiple layers of filter cotton with different pore sizes, such as coarse filter cotton for filtering large dust particles and medium-efficiency filter cotton for filtering smaller impurities.

[0044] For example, such as Figure 4 As shown, a diversion hood 4-5 is provided on the inner wall of the air duct 4-2, and the diversion hood 4-5 is spliced ​​with the bottom surface of the air supply duct 4-3.

[0045] In some examples, a diversion hood 4-5 is installed on the inner wall of the air duct 4-2. The diversion hood 4-5 is spliced ​​with the bottom surface of the air supply duct 4-3, and the splice is sealed. The shape and size of the diversion hood 4-5 are designed according to the structure of the air duct 4-2 and the air supply duct 4-3. Its function is to evenly divert the air entering the air duct 4-2 from the air outlet 3-4 to the air supply ducts 4-3 on both sides, so that the air blown out by the air curtain machine 4-4 is more uniform.

[0046] For example, such as Figure 2 As shown, the upper end face of the anti-pollution box 3-3 has an operation port 5, and a sealing buckle 6 is connected to the operation port 5 by a pin. The side wall of the anti-pollution box 3-3 has a water outlet 7, which is located on the side wall of the disinfection water chamber 3-7.

[0047] In some examples, the upper surface of the anti-pollution box 3-3 has an operation port 5, and a sealing cover 6 is connected to the operation port 5 by a pin. The sealing cover 6 must be sealed well, and a rubber sealing gasket can be installed at the edge. The operation port 5 is used to add disinfectant or to inspect the inside of the anti-pollution box 3-3. The side wall of the anti-pollution box 3-3 has a water outlet 7, which is located on the side wall of the disinfectant water chamber 3-7. The water outlet 7 can be connected to a drainage pipe for periodically discharging the sewage in the disinfectant water chamber 3-7. A valve should be installed at the water outlet 7 to control the drainage time and flow rate.

[0048] For example, such as Figure 2 As shown, there are several filter cotton layers 3-10, and multiple filter cotton layers 3-10 are arranged in an orderly manner inside the air inlet hood 3-1.

[0049] In some examples, multiple filter cotton layers 3-10 are arranged in an orderly manner inside the air inlet hood 3-1, and the filter cotton layers 3-10 need to be replaced regularly to ensure the filtration effect. An easy-to-open maintenance door can be set on the air inlet hood 3-1 to facilitate the replacement of the filter cotton.

[0050] For example, such as Figure 2 As shown, the side wall of the air duct 4-2 is provided with a plug-in pad 8, which is sealed and fitted with the paint spray booth body 1.

[0051] In some examples, the side wall of the air duct 4-2 is provided with a plug-in pad 8, which is sealed and fitted with the paint booth body 1. The plug-in pad 8 can be made of a material with good sealing performance such as rubber or silicone. Its function is to further ensure the airtightness between the air duct 4-2 and the paint booth body 1 and prevent air leakage.

[0052] For example, such as Figure 4 As shown, an air outlet 9 is provided at the lower end of the air outlet duct 4-1, and the air supply duct 4-3 is installed inside the paint booth body 1.

[0053] In some examples, an air outlet 9 is provided at the lower end of the air outlet 4-1. The shape and number of air outlets 9 should be designed according to the airflow distribution requirements inside the paint booth 1 to ensure that the purified air can be evenly delivered into the paint booth 1. The air supply duct 4-3 is fitted into the interior of the paint booth 1 and can be fixed with brackets or clamps to ensure the stability of the air supply duct 4-3.

[0054] For example, such as Figure 2 As shown, the interior of the pollution prevention box 3-3 is equipped with a mounting plate 10, and the air duct 4-2 is connected to the mounting plate 10.

[0055] In some examples, a mounting plate 10 is installed inside the pollution prevention box 3-3, and the air duct 4-2 is connected to the mounting plate 10. The mounting plate 10 is used to support and fix the air duct 4-2 to ensure the stability of the air duct 4-2 during operation, and also helps to optimize the airflow distribution inside the pollution prevention box 3-3. The mounting plate 10 can be made of metal and fixed inside the pollution prevention box 3-3 by welding or bolting.

[0056] For example, such as Figure 2 As shown, exhaust fans 11 are installed on both sides of the bottom surface of the spray booth 1 and at the door 2. Air compressors 12 are connected to the air inlets 3-9 on the air inlet hood 3-1.

[0057] In some examples, the air compressor 12 pressurizes the air intake hood 3-1, while the exhaust fan 11 is used to exhaust the air that has been circulating into the paint booth 1.

[0058] When in use, open the operation port 5 of the anti-pollution box 3-3, inject disinfectant water to the "standard line" of the level gauge (immerse the end of the extension tube 3-6 by 25cm), close the sealing buckle 6 (torque 15-20N・m), after the air pump 3-5 starts, the air enters from the air inlet hood 3-1, is purified by the multi-layer filter cotton layer 3-10 and enters the air pump 3-5, and is blown into the air inlet pipe 3-2 under high pressure. After passing through the extension tube 3-6, it enters the disinfectant water for filtration, and the air enters the air guide pipe 4-2 from the air outlet 3-4. After being blown again by the blower 3-8, it enters the air outlet pipe 4-1. After passing through the diverter hood 4-5, part of the air enters the air supply pipe 4-3 and is blown out by the air curtain machine 4-4, and the other part of the air is blown directly onto the spray painting workbench through the air supply port 9.

[0059] First, the air blown out from 4-1 is sent into the static pressure chamber, and then sent into the spray booth 1 through the filter screen on the static pressure chamber, ensuring that the air sent into the spray booth 1 flows evenly.

[0060] In addition, the air curtain machine 4-4 is also distributed inside the paint booth 1, above the door 2, so that the air curtain machine 4-4 delivers air more evenly and comprehensively.

[0061] It should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure and are not intended to limit it. Although this disclosure has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this disclosure without departing from the spirit and scope of the technical solutions of this disclosure, and all such modifications and substitutions should be covered within the scope of the claims of this disclosure.

Claims

1. A pollution prevention device for a through-type spray booth, characterized in that, include: A spray booth (1) is provided with a door (2) on the side wall of the spray booth (1); Anti-pollution air supply component (3), wherein the anti-pollution air supply component (3) is installed on the paint booth body (1); Dispersed air outlet assembly (4), wherein the dispersed air outlet assembly (4) is disposed inside the paint spray booth body (1); The pollution prevention air supply assembly (3) includes an air inlet hood (3-1), which is located on the upper surface of the paint booth body (1). An air inlet pipe (3-2) is located at the upper end of the air inlet hood (3-1). One end of the air inlet pipe (3-2) is connected to a pollution prevention box (3-3), which is located on the paint booth body (1). An air outlet (3-4) is located at the lower end of the pollution prevention box (3-3). The air outlet (3-4) is inserted into the interior of the paint booth body (1). An air pump (3-5) is installed inside the air inlet hood (3-1). The air pump (3-5) is connected to the air inlet pipe (3-2). An extension pipe (3-6) is installed at the end of the air inlet pipe (3-2). A disinfection water chamber (3-7) is installed inside the anti-pollution box (3-3). One end of the extension pipe (3-6) is inserted into the interior of the disinfection water chamber (3-7).

2. The pollution prevention device for a through-type spray booth according to claim 1, characterized in that, The air outlet (3-4) inside the pollution prevention box (3-3) is equipped with a blower (3-8), the side wall of the air inlet hood (3-1) is equipped with an air inlet (3-9), and the inside of the air inlet hood (3-1) is equipped with a filter cotton layer (3-10).

3. The pollution prevention device for a through-type spray booth according to claim 1, characterized in that, The dispersed air outlet assembly (4) includes an air outlet pipe (4-1), which is located at the top inner part of the paint spray booth (1). The air outlet pipe (4-1) is fitted onto the air outlet (3-4). An air guide pipe (4-2) is provided inside the air outlet pipe (4-1), which is connected to the air outlet (3-4). Air supply pipes (4-3) are provided on the opposite side walls of the air guide pipe (4-2). An air curtain machine (4-4) is connected to the end of the air supply pipe (4-3), which is located on the inner side wall of the paint spray booth (1).

4. The anti-pollution device for a through-type spray booth according to claim 3, characterized in that, The inner wall of the air duct (4-2) is provided with a flow divider (4-5), which is spliced ​​with the bottom surface of the air supply duct (4-3).

5. The anti-pollution device for a through-type spray booth according to claim 1, characterized in that, The upper end face of the anti-pollution box (3-3) has an operation port (5), and a sealing buckle (6) is connected to the operation port (5) by a pin. The side wall of the anti-pollution box (3-3) has a water outlet (7), and the water outlet (7) is located on the side wall of the disinfection water chamber (3-7).

6. The anti-pollution device for a through-type spray booth according to claim 2, characterized in that, The number of filter cotton layers (3-10) is several, and the multiple filter cotton layers (3-10) are arranged in an orderly manner inside the air inlet hood (3-1).

7. The pollution prevention device for a through-type spray booth according to claim 3, characterized in that, The side wall of the air duct (4-2) is provided with a plug-in pad (8), and the plug-in pad (8) is sealed and fitted with the paint spray booth body (1).

8. A pollution prevention device for a through-type spray booth according to claim 3, characterized in that, The lower end of the air outlet pipe (4-1) is provided with an air inlet (9), and the air supply pipe (4-3) is installed inside the paint spray booth body (1).

9. A pollution prevention device for a through-type spray booth according to claim 3, characterized in that, The anti-pollution box (3-3) is equipped with a mounting plate (10), and the air duct (4-2) is connected to the mounting plate (10).

10. A pollution prevention device for a through-type spray booth according to claim 2, characterized in that, Exhaust fans (11) are provided on both sides of the inner bottom surface of the spray booth (1) and at the door (2). A wind compressor (12) is connected to the air inlet (3-9) on the air inlet hood (3-1).

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