A new type of automobile bumper dry spray house structure
By optimizing the structure and filter layout of the dry spray booth, the problems of low paint mist capture rate and high cost in existing spray booths have been solved, achieving efficient paint mist capture and stable equipment operation, and reducing the cost of filter replacement and waste disposal.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- FAW TOYOTA MOTOR (CHENGDU) CO LTD
- Filing Date
- 2025-04-09
- Publication Date
- 2026-06-09
AI Technical Summary
Existing wet spray booths have low paint mist capture rates and high energy and chemical costs. While dry spray booths have high paint mist capture rates, they have higher costs for filter replacement and solid waste disposal, and the stability of the equipment is affected by the fan.
A novel dry spray booth structure for automotive bumpers is designed, featuring a sloping spray booth bottom, a mixed exhaust air box, and an independent filter replacement inlet. Combined with a large-capacity bag filter, the filter layout is optimized to extend service life and reduce costs.
It improves paint mist capture rate, reduces filter replacement and solid waste disposal costs, ensures stable equipment operation, and reduces fan load and duct blockage risk.
Smart Images
Figure CN224332535U_ABST
Abstract
Description
Technical Field
[0001] A novel dry spray booth structure for automotive bumpers is disclosed, which is used for painting bumpers on automotive production lines. This invention relates to the design and manufacturing technology of bumper painting equipment on automotive production lines. Background Technology
[0002] With the continuous development of the painting industry, the demand for car bumpers has also increased significantly. Car bumper production mainly includes injection molding, painting, and assembly. First, the injection molding machine completes the injection molding of the car bumper. Then, the car bumper is mounted on a conveyor trolley on the painting line and transported to the spray booth for painting and baking. Finally, the car bumper is assembled.
[0003] The car bumper is mounted on a conveyor trolley on the painting line and then sequentially transferred to the primer, topcoat, and clear coat spray booths for painting. Currently, there are two types of spray booths used for bumper painting:
[0004] 1. Wet Spray Booth: Traditional painting lines all use wet spray booths, which use water in the process of separating paint mist. In a venturi or water vortex chamber, air carrying paint mist is thoroughly mixed with water. The paint mist in the air is washed away by the water, achieving separation of air and paint mist. The air enters the exhaust duct after passing through the air-water separation baffle, while the paint mist mixed in the water is carried into the paint sludge pool. Two agents are added to the paint sludge pool: one to make the paint lose its stickiness, and the other to make the paint re-flocculate and adhere to the water surface.
[0005] 2. Dry Spray Booth: Dry spray booths do not have water, water circulation, venturi systems, air-water separators, paint sludge pools, or circulating water pumps at the bottom, nor do they use water to absorb paint mist. When purifying paint mist generated by the spraying equipment, the dry spray booth uses the booth's supply and exhaust air as the driving force, allowing the paint mist to pass through the grille and several filters before being purified and discharged outdoors through the exhaust pipe.
[0006] The advantages and disadvantages of existing wet and dry spray booth technologies are as follows:
[0007] Wet spray booths: In general, wet spray booths have higher energy consumption costs, higher chemical costs for treating paint residue in the paint residue tank, and higher costs for treating wet paint residue with water. This is because wet spray booths use water curtains, water swirls, and other water flow to intercept paint mist. However, due to the small size of the paint mist particles, especially solvent-based paints, some particles are not completely adsorbed by water due to surface tension or inertia. The uncaptured paint mist will enter the exhaust system with the airflow. In addition, if flocculants are not added to the circulating water in time or the paint residue is not removed in time, the paint mist in the water will be resuspended. The accumulation of paint residue in the water tank may lead to uneven water flow distribution, forming local capture blind spots, resulting in a low paint mist capture rate of wet spray booths.
[0008] The high humidity environment of a wet spray booth increases air density, and moisture can enter the fan through airflow, increasing the motor load. Long-term operation may lead to overload or efficiency degradation. Furthermore, escaping paint mist easily combines with moisture to form sticky substances that adhere to fan blades, duct walls, or filters, increasing air resistance and significantly reducing fan efficiency. Ultimately, this severely impacts the exhaust capacity of the rear fan, resulting in unstable airflow speed and direction within the spray booth. Existing wet spray booth technologies, such as water curtain booths and Venturi sprayers, address this issue. The interception efficiency of wet spray booths is insufficient, causing a large amount of paint mist to escape to the downstream ducts and fan impellers. Paint mist deposition can clog the ducts, pollute the fans, and affect the normal operation of the equipment. If this unintercepted paint mist enters VOC treatment equipment, such as activated carbon adsorption and catalytic combustion devices, it may clog the filter materials, such as activated carbon pores and impellers. Therefore, the low paint mist capture rate of wet spray booths leads to high risks to downstream VOC equipment, high filter costs for VOC equipment, and increased treatment costs for high COD paint sludge wastewater, resulting in significant environmental risks.
[0009] Dry spray booths, lacking water circulation systems, venturi systems, air-water separators, paint sludge pools, and circulating water pumps at the bottom, eliminate the need for water to absorb paint mist. Instead, the paint mist generated during spraying is carried to the bottom of the booth by the air supply and enters the dry exhaust system through the exhaust vents. It then passes through a mixing exhaust box, a primary box filter, and a secondary filter, with most of the paint mist adhering to the surfaces of the ducts and filters, ultimately achieving paint mist collection. Therefore, dry spray booths have relatively low energy costs and zero chemical costs. Compared to wet waste, solid waste treatment costs are lower, and there is no wastewater, making it more environmentally friendly. Furthermore, dry spray booths have a high paint mist capture rate. Because the rear-end fans are unaffected by paint mist, their operation is stable, resulting in consistent airflow speed and direction within the booth and eliminating color variations or quality defects. Due to the high paint mist capture rate, the rear-end VOC equipment also operates stably, and the cost of VOC filters is lower. Utility Model Content
[0010] The purpose of this utility model is to extend the service life of the filter by adjusting and optimizing the structure of the dry spray booth and the filter form, and to design a new type of dry spray booth structure for automobile bumpers that reduces the cost of filter use, filter replacement and solid waste disposal.
[0011] A novel dry spray booth structure for automotive bumpers includes an air supply chamber, a painting chamber, and an exhaust system.
[0012] The air supply chamber includes a dynamic pressure chamber for the spray chamber, a static pressure chamber for the spray chamber, an air supply side regulating baffle, and a top filter;
[0013] The bottom surface of the spray booth is set as a slope, with the sides of the spray booth being higher and the middle being lower;
[0014] The spray booth has a rectangular structure with a sloping bottom surface that is higher on both sides and lower in the middle. A barrier is installed along the air vent of the spray booth at the lowest point in the middle of the bottom surface.
[0015] A waste liquid tank is installed at the lowest point in the middle of the bottom surface of the spray booth to prevent waste liquid from flowing into the air duct when the waste liquid recovery equipment malfunctions.
[0016] No filter is installed at the exhaust vent of the spray booth; instead, a high-strength stainless steel mesh with large gaps is installed.
[0017] Preferably, an air supply side regulating baffle is provided between the dynamic pressure chamber and the static pressure chamber of the spray booth;
[0018] Preferably, an air outlet regulator is provided on the air supply side regulating baffle, and the opening of the regulator can be adjusted.
[0019] The spray booth includes a coating equipment chamber, a spray booth bottom surface, and a grating plate. The coating equipment chamber is arranged on both sides, and the grating plate is arranged between the coating equipment chamber and the spray booth bottom surface.
[0020] Preferably, the coating equipment room is equipped with tracks for moving the coating transport trolley;
[0021] The exhaust system includes a main exhaust duct, a mixed exhaust box, a primary box filter, a secondary bag filter, and a secondary filter replacement inlet.
[0022] The rear end of the main exhaust duct is connected to the exhaust fan, and the front end is connected to the secondary bag filter. A secondary filter replacement inlet is set between the primary box filter and the secondary bag filter.
[0023] The exhaust end of the mixed exhaust air box is connected to the air inlet end of the primary box filter, and the air inlet end of the mixed exhaust air box receives the discharged mist through the exhaust port of the spray booth.
[0024] Preferably: the exhaust air from the bottom of the spray booth is not split after exhaust, and enters the mixed exhaust air box as a whole. The exhaust air is split at the rear end of the mixed exhaust air box and enters the independent box-type filters respectively.
[0025] Preferably, the mixed exhaust air box is located on the side of the exhaust vent of the spray booth, which can change the exhaust air path multiple times;
[0026] Preferably, the secondary bag filter is a bag filter with a large paint capacity, and the number can be four or six depending on the space.
[0027] The beneficial technical effects of this utility model are as follows:
[0028] 1. The bottom of the spray booth is sloped and equipped with a waste liquid tank and overflow plate to prevent waste liquid from flowing into the air duct when the waste liquid recovery equipment malfunctions.
[0029] 2. The mixed exhaust air box is set off-center and located on the side of the spray booth exhaust vent. The mixed exhaust air box has a large area and can change the airflow direction multiple times, which can absorb more paint mist, reduce the amount of paint mist adhering to the filter, and thus reduce the amount of filter used, thereby reducing costs.
[0030] 3. The mixed exhaust air box can redistribute the air volume very well. If the pressure difference of a certain group of filters at the back end increases, the exhaust volume of that part will decrease. The reduced air volume will automatically flow to the other groups of filters, which can better distribute the air volume on the exhaust side and ensure the overall exhaust air volume.
[0031] 4. A secondary filter inlet is provided between the primary box filter and the secondary bag filter. When replacing the filter, each can be replaced independently. This solves the problem that in the prior art, the primary box filter must be removed before the secondary bag filter unit can be inspected or replaced. It makes it easier to replace or inspect the secondary filter, making the inspection and replacement of the secondary bag filter 15 more convenient.
[0032] 5. The mixed exhaust air box and filter are both set off from the center line of the spray booth and are located on the side of the mixed exhaust air box and filter. This effectively integrates the scattered and small area on the ground and expands a more spacious passage. Such a passage can not only meet the replacement of the box filter 13, but also provide a centralized space for storage. Attached Figure Description
[0033] Figure 1 This is a schematic diagram showing the layout and distribution of this utility model;
[0034] Figure 2 This utility model Figure 1 A schematic diagram of the AA-surface structure. Detailed Implementation
[0035] To clearly illustrate the layout of this utility model, the preferred embodiment of this utility model is given below in conjunction with the accompanying drawings.
[0036] In the diagram: 01-Spray booth dynamic pressure chamber, 02-Air supply side adjustment baffle, 03-Spray booth static pressure chamber, 04-Filter, 05-Coating equipment room, 06-Spray booth painting room, 07-Sprayed workpiece, 08-Transfer trolley, 09-Grating plate, 10-Spray booth bottom surface, 11-Spray booth exhaust vent, 12-Mixed exhaust air box, 13-Primary box filter, 14-Secondary filter replacement inlet, 15-Secondary bag filter, 16-Main exhaust duct, 17-Waste liquid tank.
[0037] A novel dry spray booth structure for automotive bumpers. The system includes an air supply chamber, a painting chamber, and an exhaust system: the air supply chamber includes a spray booth dynamic pressure chamber 01, a spray booth static pressure chamber 03, an air supply side adjustment baffle 02, and a top filter 04.
[0038] The spray booth includes a coating equipment chamber 05, a spray booth bottom surface 10, and a grating plate 09. The coating equipment chamber 05 is arranged on both sides, and the grating plate 09 is located between the coating equipment chamber 05 and the spray booth bottom surface 10. The spray booth has a rectangular structure with a sloping bottom, meaning the sides of the spray booth are higher than the middle. A barrier is set along the exhaust vent 11 at the lowest point of the spray booth structure, and a waste liquid tank 17 is set in the middle of the lowest point of the spray booth. This arrangement can prevent waste liquid from flowing into the air duct when the waste liquid recovery equipment malfunctions.
[0039] Eleven exhaust vents in the spray booth are not equipped with filters, but instead feature high-strength stainless steel mesh with large gaps. This ensures smooth exhaust while preventing personnel from falling.
[0040] An air supply side regulating baffle 02 is provided between the dynamic pressure chamber 01 and the static pressure chamber 03 of the spray booth. An air outlet regulator is provided on the air supply side regulating baffle 02, and the opening of the regulator can be adjusted.
[0041] The painting room includes a painting equipment room 05, which is arranged on both sides; the painting equipment room 05 is equipped with a track for the painting transport trolley to move.
[0042] The exhaust system includes a main exhaust duct 16, a mixed exhaust box 12, a primary box filter 13, a secondary bag filter 15, and a secondary filter replacement inlet 14.
[0043] The rear end of the main exhaust duct 16 is connected to the exhaust fan, and the front end is connected to the secondary bag filter 15. A secondary filter replacement inlet 14 is provided between the primary box filter 13 and the secondary bag filter 15. The secondary filter inlet 14 provided between the primary box filter 13 and the secondary bag filter 15 can not only independently inspect the condition of the secondary filter unit, but also make it easier to replace the secondary filter. When replacing, it is not necessary to pull out the primary box filter, which makes the inspection and replacement of the secondary bag filter more convenient.
[0044] The exhaust end of the mixed exhaust air box 12 is connected to the air inlet end of the primary box filter 13. The air inlet end of the mixed exhaust air box 12 receives the exhaust mist through the air vent 11 of the spray booth. After the air is exhausted from the air vent of the spray booth bottom 10, it is not split and enters the mixed exhaust air box 12 as a whole. The exhaust air is split through the rear end of the mixed exhaust air box 12 and enters the independent box filters 13 respectively.
[0045] The mixed exhaust air box 12 is located on the side of the exhaust vent 11 of the spray booth, which can change the exhaust air path multiple times. Both the mixed exhaust air box and the filter are set off from the center line of the spray booth and are located on the side. This effectively integrates the scattered and small ground area into a more spacious channel, which can not only meet the needs of filter replacement, but also provide a centralized space for storage.
[0046] The secondary bag filter 15 is a bag filter with a large paint capacity, and the number can be four or six depending on the space.
[0047] Furthermore: The combination of the mixed exhaust air box 12, the primary box filter 13 and the secondary bag filter 15 adopted in this embodiment can be adapted to different numbers of filter combinations and different forms of filter according to different requirements of the spray booth size and wind speed. Therefore, it will not be described in detail here.
[0048] Furthermore, the mixed exhaust fan box 12 used in this utility model can realize the change of paint mist flow direction and paint mist absorption. The mixed exhaust fan box 12 has strong scalability, and its size can be adjusted by those skilled in the art according to the actual number of coatings, and the number of filter units can be adjusted accordingly. The secondary filter replacement inlet is set up so that those skilled in the art can skillfully use it as the filter inspection port according to the set inspection and filter replacement time regulations, and can also independently carry out secondary filter inspection or replacement. The specific method will not be described in detail here.
[0049] Furthermore, the secondary bag filter 15 adopts a bag filter with a larger paint capacity. The specific paint capacity needs to be designed and selected in combination with the capacity and exhaust volume of the production line. The size of the production line and the exhaust volume of the coating are clearly required in the production line design. Those skilled in the art can design the required paint capacity bag filter according to the requirements of the production line design. Such a bag filter with a large paint capacity can also use a different number of bag filters. If a different number of bag filters is used, those skilled in the art know how to replace a large-capacity bag filter with multiple bag filters, as long as the combined capacity of the multiple bag filters is equal to or slightly greater than that of the original bag filter. These details will not be elaborated here.
Claims
1. A novel dry spray booth structure for automotive bumpers, comprising an air supply chamber, a spray booth, and an exhaust system, characterized in that: The air supply chamber includes a dynamic pressure chamber (01), a static pressure chamber (03), an air supply side regulating baffle (02), and a top filter (04); the air supply side regulating baffle (02) is provided between the dynamic pressure chamber (01) and the static pressure chamber (03). The spray booth includes a coating equipment chamber (05), a spray booth bottom surface (10), and a grating plate (09). The coating equipment chamber (05) is arranged on both sides, and the grating plate (09) is located between the coating equipment chamber (05) and the spray booth bottom surface (10). The spray booth is a rectangular structure with a sloping bottom (10) that is high on both sides and low in the middle. A barrier is set along the exhaust vent (11) of the spray booth at the lowest point in the middle of the bottom (10). A waste liquid tank is set at the middle position of the lowest point in the bottom surface (10) of the spray booth; The exhaust system includes a main exhaust pipe (16), a mixed exhaust box (12), a primary box filter (13), a secondary bag filter (15), and a secondary filter replacement inlet (14). The rear end of the main exhaust duct (16) is connected to the exhaust fan, and the front end is connected to the secondary bag filter (15). A secondary filter replacement inlet (14) is provided between the primary box filter (13) and the secondary bag filter (15).
2. The novel dry spray booth structure for automobile bumpers according to claim 1, characterized in that: A stainless steel mesh is installed at the exhaust vent (11) of the spray booth.
3. The novel dry spray booth structure for automobile bumpers according to claim 1, characterized in that: An air outlet regulator is provided on the air supply side regulating baffle (02), and the opening of the regulator is adjustable.
4. The novel dry spray booth structure for automobile bumpers according to claim 1, characterized in that: The coating equipment room (05) is equipped with a track for the coating transport trolley to move.
5. The novel dry spray booth structure for automobile bumpers according to claim 1, characterized in that: The exhaust end of the mixed exhaust box (12) is connected to the air inlet end of the primary box filter (13), and the air inlet end of the mixed exhaust box (12) receives the exhaust mist through the spray chamber exhaust port (11).
6. The novel dry spray booth structure for automobile bumpers according to claim 1, characterized in that: After exhausting from the bottom surface (10) of the spray booth, the exhaust air does not split and enters the mixed exhaust air box (12) as a whole. The exhaust air is split at the rear end of the mixed exhaust air box (12) and enters the independent box filter (13) respectively.
7. The novel dry spray booth structure for automobile bumpers according to claim 1, characterized in that: The mixed exhaust air box (12) is located on the side of the exhaust port (11) of the spray booth.
8. The novel dry spray booth structure for automobile bumpers according to claim 1, characterized in that: The secondary bag filter (15) is a bag filter with a large paint capacity, and the number is four or six depending on the space.