Movable supersonic flame spraying equipment

Abstract

The invention relates to the technical field of spraying equipment, and discloses movable supersonic flame spraying equipment which comprises a movable spraying room, the spraying room is provided with a gas making chamber, a gas supply chamber, a powder feeding chamber and a spraying chamber, a spraying system comprises a mechanical arm, a suspension frame, a spraying gun, a grinding and polishing head and a 3D scanner, and a rail is transversely arranged on the ground of the spraying room; the mechanical arm is arranged on the track in a sliding mode, the suspension frame is fixed to the ground of the spraying chamber, the spray gun, the grinding and polishing head and the 3D scanner are suspended on the suspension frame, and the spray gun communicates with the gas making system, the gas supply system and the powder feeding system through pipelines. According to the equipment, pretreatment of the spraying track before spraying and surface machining after spraying can be conducted, the service life of the spraying pipe is prolonged, spraying powder can be recycled, and the spraying flexibility, portability and spraying efficiency are improved.

Description

Technical Field

[0001] The invention relates to the technical field of spraying equipment, and in particular to a movable supersonic flame spraying device. Background Art

[0002] With the continuous advancement of aviation technology and the improvement of aircraft performance, the demand for aircraft maintenance is also increasing. During the flight, aircraft experience extreme temperature changes, air pressure fluctuations, friction and other harsh conditions, which may cause surface materials to suffer from wear, corrosion and fatigue. Supersonic flame spraying equipment plays a vital role in material repair and protection.

[0003] Supersonic flame spraying equipment can efficiently apply protective coatings to key aircraft components, such as engine fuselages and landing gear, greatly extending the service life of components and improving safety. Traditional maintenance methods often fail to effectively solve these problems. Supersonic flame spraying technology can accurately apply high-performance coatings to damaged surfaces at a high melting temperature and spraying speed, forming a dense protective layer, thereby enhancing the material's wear resistance, oxidation resistance, and corrosion resistance.

[0004] At present, some supersonic flame spraying equipment can only rely on the experience of construction workers to plan the trajectory before spraying, and cannot accurately predict the processing trajectory. The uneven surface after spraying requires secondary processing, which is time-consuming and labor-intensive. At the same time, the inner wall of the nozzle of the spray gun is damaged quickly due to the impact force from the spray powder; during spraying, a large amount of dust will not adhere to the surface of the workpiece, but diffuse in the air, resulting in a waste of spray powder. Summary of the invention

[0005] The invention provides a movable supersonic flame spraying device, which can perform pretreatment of the spraying track before spraying and surface processing after spraying, thereby increasing the service life of the spray pipe, and can also recycle the spraying powder, thereby improving the flexibility, portability and spraying efficiency of the spraying.

[0006] The above-mentioned object of the invention is achieved through the following technical solutions: A movable supersonic flame spraying device comprises a movable spraying room, wherein the spraying room is provided with an air making chamber, an air supply chamber, a powder delivery chamber and a spraying room in sequence from back to front, the air making chamber is provided with an air making system for preparing compressed air, the air supply chamber is provided with an air supply system for providing combustion gas, the powder delivery chamber is provided with a powder delivery system for conveying spray powder, and the spraying room is provided with a spraying system for supersonic flame spraying; the spraying system comprises a mechanical arm, a suspension frame, a spray gun, a grinding and polishing head and a 3D scanner, a track is horizontally provided on the floor of the spraying room, the mechanical arm is slid on the track, the suspension frame is fixed on the floor of the spraying room, the spray gun, the grinding and polishing head and the 3D scanner are hung on the suspension frame, and the spray gun is respectively connected with the air making system, the air supply system and the powder delivery system through pipelines.

[0007] The above-mentioned movable supersonic flame spraying equipment, wherein the suspension frame includes a bracket, the bracket is provided with a plurality of brackets along the circumferential direction, the bracket is provided with a C-shaped slot opening outward, and a spray gun, a grinding and polishing head and a 3D scanner are respectively hung on the C-shaped slots of the plurality of brackets.

[0008] The above-mentioned movable supersonic flame spraying equipment, wherein the spray gun includes a spray gun body with an inner cavity, the front end of the spray gun body is provided with a nozzle connected to its inner cavity, the rear end of the spray gun body is respectively provided with an oxygen delivery pipe, an acetylene delivery pipe and a spray powder pipe connected to its inner cavity, and the rear side of the spray powder pipe is respectively connected to a compressed air delivery pipe and a spray powder delivery pipe.

[0009] In the above-mentioned movable supersonic flame spraying equipment, the inner cavity of the nozzle is a cone from inside to outside, which is narrow inside and wide outside. The angle between the inner wall of the nozzle and the axis of the nozzle is α, and α is 0.001-0.01°.

[0010] The above-mentioned movable supersonic flame spraying equipment, wherein the gas production system includes an air compressor, an air dryer and an air storage tank connected in sequence, the outlet of the air storage tank is connected to the compressed air delivery pipe through a pipeline, and a first flow control valve is provided on the pipeline of the air storage tank outlet.

[0011] In the above-mentioned movable supersonic flame spraying equipment, an air purifier and a flow controller are also connected in series on the outlet pipeline of the gas storage tank.

[0012] The above-mentioned movable supersonic flame spraying equipment, wherein the gas supply system includes an oxygen cylinder and an acetylene cylinder, the oxygen cylinder and the acetylene cylinder are connected to the oxygen delivery pipe and the acetylene delivery pipe respectively through pipelines, and the second flow control valve and the third flow control valve are respectively connected to the pipeline of the oxygen cylinder and the pipeline of the acetylene cylinder.

[0013] The above-mentioned movable supersonic flame spraying equipment, wherein the powder feeding system includes a powder feeder for holding spraying powder, the oxygen cylinder is connected to the inlet of the powder feeder through a pipeline, the outlet of the powder feeder is connected to the spraying powder delivery pipe through a pipeline, and a fourth flow control valve is connected to the pipeline at the outlet of the powder feeder.

[0014] The above-mentioned movable supersonic flame spraying equipment, wherein the air production chamber, the air supply chamber and the powder delivery chamber are respectively provided with air inlets and exhaust outlets, the air inlets and exhaust outlets are arranged opposite to each other and are located at the upper part of the two lateral walls of the spraying room, and a dust collector is also provided in the spraying room.

[0015] The above-mentioned movable supersonic flame spraying equipment, wherein, the bottom of the spray room is provided with a universal roller, the wall panel of the spray room is provided with sound insulation cotton, the rear side of the spray room is provided with a sound insulation door, the gas making chamber, the air supply chamber, the powder delivery chamber and the spraying chamber are all provided with transparent windows, the gas making chamber and the air supply chamber, the air supply chamber and the powder delivery chamber, and the powder delivery chamber and the spraying chamber are all provided with isolation doors, and the top plate of the spraying room is provided with a clamping device for fixing the workpiece to be sprayed.

[0016] In summary, the beneficial technical effects of the present invention are: The present invention includes a movable spraying room, which is provided with a gas-making chamber, an air supply chamber, a powder delivery chamber and a spraying room from back to front, the gas-making chamber is provided with a gas-making system for preparing compressed air, the air supply chamber is provided with an air supply system for providing combustion gas, the powder delivery chamber is provided with a powder delivery system for conveying spray powder, and the spraying room is provided with a spraying system for supersonic flame spraying; the spraying system includes a mechanical arm, a suspension frame, a spray gun, a grinding and polishing head and a 3D scanner, a track is provided horizontally on the floor of the spraying room, the mechanical arm is slid on the track, the suspension frame is fixed on the floor of the spraying room, the spray gun, the grinding and polishing head and the 3D scanner are hung on the suspension frame, and the spray gun is connected to the gas-making system, the air supply system and the powder delivery system respectively through pipelines. The equipment can pre-process the spraying trajectory before spraying and surface process after spraying, improve the service life of the nozzle, and can also recycle the spraying powder to improve the flexibility, portability and spraying efficiency of spraying. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a structural schematic diagram of another perspective of the present invention; Figure 3 is a longitudinal sectional view of the present invention; Figure 4 is a transverse cross-sectional view of the present invention; Figure 5 It is a structural schematic diagram of the suspension frame of the present invention; Figure 6 It is a schematic diagram of the structure of the spray gun of the present invention; Figure 7 It is a partial cross-sectional view of the nozzle of the spray gun of the present invention.

[0018] As shown in the figure, 1. spray room; 11. track; 12. universal roller; 13. air inlet; 14. air outlet; 15. soundproof door; 16. transparent window; 2. gas making room; 21. gas making system; 211. air compressor; 212. air dryer; 213. gas storage tank; 214. first flow control valve; 215. air purifier; 216. flow controller; 3. gas supply room; 31. gas supply system; 311. oxygen cylinder; 3111. second flow control valve; 312. acetylene cylinder; 3121. third flow control valve; 4. powder delivery room; 41. Powder feeding system; 411, powder feeder; 412, fourth flow control valve; 5, spraying room; 51, spraying system; 511, robotic arm; 512, suspension frame; 5121, bracket; 5122, bracket; 5123, C-shaped slot; 513, spray gun; 5131, spray gun body; 5132, nozzle; 5133, oxygen delivery pipe; 5134, acetylene delivery pipe; 5135, spray powder pipe; 5136, compressed air delivery pipe; 5137, spray powder delivery pipe; 514, grinding and polishing head; 515, 3D scanner; 52, dust collector. DETAILED DESCRIPTION

[0019] The following is combined with Figure 1-7 The present invention is described in further detail.

[0020] like Figure 1-4 As shown, a movable supersonic flame spraying equipment includes a movable spraying room 1, and the spraying room 1 is provided with an air making chamber 2, an air supply chamber 3, a powder delivery chamber 4 and a spraying room 5 from back to front. The air making chamber 2 is provided with an air making system 21 for preparing compressed air, the air supply chamber 3 is provided with an air supply system 31 for providing combustion gas, the powder delivery chamber 4 is provided with a powder delivery system 41 for conveying spray powder, and the spraying room 5 is provided with a spraying system 51 for supersonic flame spraying.

[0021] The spraying system 51 includes a robot arm 511, a suspension frame 512, a spray gun 513, a grinding and polishing head 514 and a 3D scanner 515. A track 11 is horizontally provided on the floor of the spraying room 1. The robot arm 511 is slidably arranged on the track 11. The suspension frame 512 is fixed on the floor of the spraying room 5. The spray gun 513, the grinding and polishing head 514 and the 3D scanner 515 are hung on the suspension frame 512. The spray gun 513 is connected to the gas production system 21, the gas supply system 31 and the powder delivery system 41 through pipelines.

[0022] like Figure 5As shown, the suspension frame 512 includes a bracket 5121, and the bracket 5121 is provided with a plurality of brackets 5122 along the circumferential direction. The bracket 5122 is provided with a C-shaped slot 5123 opening outward, and a spray gun 513, a grinding and polishing head 514 and a 3D scanner 515 are respectively suspended on the C-shaped slots 5123 of the plurality of brackets 5122.

[0023] During spraying, the robot arm 511 grabs the spray gun 513 from the bracket 5122 for spraying. When a polishing head 514 or a 3D scanner 515 is needed, the spray gun 513 is placed on the bracket 5122.

[0024] The robot arm 511 can grab the 3D scanner 515 to detect the shape of the workpiece to be sprayed, plan the processing path and record the processing path, that is, by detecting the workpiece before and after processing, by detecting the shape of the workpiece before processing, a more reasonable trajectory planning can be obtained, and the processed surface can be inspected after processing, and the surface morphology of the workpiece can be analyzed. By analyzing the thickness difference of the workpiece before and after spraying, the thickness of the coating can be obtained, and the entire processing process can be recorded to facilitate quality control and defect tracing. The robot arm 511 can perform subtractive processing on the uneven surface after spraying by grabbing the grinding and polishing head 514. Through the grinding and polishing head 514 and the 3D scanner 515, the spraying quality of the spraying equipment is improved, secondary spraying is avoided, and the spraying efficiency is greatly improved.

[0025] The 3D scanner 515 obtains a three-dimensional image of the object to be sprayed. The three-dimensional image includes pixels of different sizes. The order of the above multiple pixels is arranged according to the positions of the multiple pixels. When spraying, the spray gun 513 moves the nozzle 5132 in sequence according to the acquired three-dimensional image pixels and sprays the surface of the object. This process is to move the position of the nozzle 5132 relative to the surface of the object according to the position of the pixel, including adjusting the distance between the nozzle 5132 and the surface of the object according to the size of the pixel, and determining the coating time according to the size of the pixel.

[0026] Specifically, when the size of the three-dimensional image pixel is greater than a preset value, the control system may increase the distance between the nozzle 5132 and the surface of the object; when the size of the three-dimensional image pixel is less than the preset value, the distance between the nozzle 5132 and the surface of the object is reduced.

[0027] The 3D scanner 515 obtains the normal vector information of each pixel of the three-dimensional image, moves the position of the nozzle 5132 relative to the surface of the object according to the position of the pixel, and adjusts the angle of the nozzle 5132 according to the normal vector information of the pixel.

[0028] like Figure 6As shown, the spray gun 513 includes a spray gun body 5131 with an inner cavity, the front end of the spray gun body 5131 is provided with a nozzle 5132 connected with the inner cavity, the rear end of the spray gun body 5131 is respectively provided with an oxygen delivery pipe 5133, an acetylene delivery pipe 5134 and a spray powder pipe 5135 connected with the inner cavity, and the rear side of the spray powder pipe 5135 is respectively connected to a compressed air delivery pipe 5136 and a spray powder delivery pipe 5137.

[0029] like Figure 7 As shown, the inner cavity of the nozzle 5132 is a cone from the inside to the outside, which is narrow inside and wide outside. The angle between the inner wall of the nozzle 5132 and the axis of the nozzle 5132 is α, and α is 0.001-0.01°.

[0030] The inner cavity of the nozzle 5132 adopts a conical structure with a small inside and a large outside, which reduces the impact force of the spray powder on the inner wall of the nozzle 5132 and extends the service life of the nozzle 5132. When the powder passes through the nozzle 5132, the flow rate of the spray powder in the middle position of the nozzle 5132 remains unchanged, and the flow rate at the edge position is reduced. There is a pressure difference between the middle and edge of the nozzle 5132, which can reduce the impact on the inner wall of the nozzle 5132.

[0031] like Figure 3 , 4 As shown, the gas production system 21 includes an air compressor 211, an air dryer 212 and an air tank 213 connected in sequence. The outlet of the air tank 213 is connected to the compressed air delivery pipe 5136 through a pipeline, and a first flow control valve 214 is provided on the pipeline at the outlet of the air tank 213.

[0032] Furthermore, an air purifier 215 and a flow controller 216 are connected in series to the outlet pipeline of the air storage tank 213 .

[0033] The air compressor 211 compresses the air and dries it through the air dryer 212. The dried high-pressure air is stored in the air storage tank 213 and then enters the air purifier 215. The flow rate of the clean high-pressure compressed air output is controlled by the flow controller 216.

[0034] The mixed gas of the ejected oxygen and acetylene flows out of the nozzle 5132 and is ignited to form a flame. The mixed gas outflow speed of the spray gun 513 of the present invention is the same as the flame combustion speed. If the flame speed is higher than the gas outflow speed, it will cause a safety accident of the flame burning in the spray gun body 5131; if the flame speed is higher than the gas outflow speed, the flame will be separated from the nozzle 5132, and the stability of the flame combustion is poor.

[0035] In the present invention, the design pressure of the nozzle 5132 is ≥1.0Mpa.

[0036] The gas supply system 31 includes an oxygen cylinder 311 and an acetylene cylinder 312. The oxygen cylinder 311 and the acetylene cylinder 312 are connected to the oxygen delivery pipe 5133 and the acetylene delivery pipe 5134 through pipelines respectively. The pipeline of the oxygen cylinder 311 and the pipeline of the acetylene cylinder 312 are respectively connected to the second flow control valve 3111 and the third flow control valve 3121.

[0037] The powder feeding system 41 includes a powder feeder 411 for containing spray powder. The oxygen cylinder 311 is connected to the inlet of the powder feeder 411 through a pipeline. The outlet of the powder feeder 411 is connected to the spray powder delivery pipe 5137 through a pipeline. The pipeline at the outlet of the powder feeder 411 is connected to a fourth flow control valve 412.

[0038] The powder feeder 411 uses oxygen as carrier gas to continuously and evenly feed the spray powder to the spray powder delivery pipe 5137 of the spray gun 513. The powder delivery rate can be adjusted by the fourth flow control valve 412 to meet the needs of the spraying process. It mixes the spray powder with oxygen into a fluid state and delivers it to the spray powder delivery pipe 5137 of the spray gun 513 at a certain pressure and flow rate. The high pressure of the compressed air delivery pipe 5136 is mixed with the spray powder and delivered to the inner cavity of the spray gun 513. Finally, the oxygen and acetylene gas are mixed and supersonic flame sprayed from the nozzle 5132. With the oxygen-acetylene flame as the heat source, the spray powder is heated to a molten or plastic state. Under the action of the high-speed airflow, the atomized particles are sprayed on the surface of the workpiece to form a coating.

[0039] like Figure 1-3 As shown, the air inlet 13 and the exhaust outlet 14 are respectively arranged in the air making chamber 2, the air supply chamber 3 and the powder delivery chamber 4. The air inlet 13 and the exhaust outlet 14 are arranged opposite to each other and are located at the upper part of the two lateral walls of the spraying room 1. A dust collector 52 is also provided in the spraying room 5.

[0040] The air inlet 13 can introduce fresh air into the spray room 1, and the fresh air gradually diffuses and sinks, bringing the dust to the exhaust port 14. The exhaust port 14 is equipped with an exhaust fan, which forms air convection with the air inlet 13 to complete the ventilation. The air inlet 13 adopts a multi-turn dissipation silent air inlet made of sound insulation material to achieve silent air intake.

[0041] The dust collector 52 can absorb the spray dust diffused in the spray room 5, improve the working environment, and realize the recovery of dust. When the dust collector 52 is in operation, the dust-containing gas enters the dust collector 52 from the top inlet through the filter element. In this process, the dust is captured on the outer surface of the filter element, and the clean air enters the clean air chamber of the dust collector 52 through the center of the filter element, and then is discharged through the outlet of the dust collector 52. When the filter element is cleaned, the control timer will automatically select one or more pairs of filter elements for cleaning, and the control system will open the electromagnetic pulse valve, and the high-pressure air will directly rush into the center of the selected filter element to clean the dust collected on the surface of the filter element. After the dust falls into the ash hopper under the action of gravity, the spray powder can be recycled.

[0042] The present invention is also provided with an alarm system, which includes a temperature and humidity sensor, which is electrically connected to the controller. The temperature and humidity information of each room in the spraying room is detected by the temperature and humidity sensor, the operation of the equipment in each room is monitored in real time, and the temperature and humidity data during the working process are recorded, which is convenient for quality control and defect tracing. If there is any abnormal situation, an alarm can be issued in time.

[0043] The control panel is equipped with pressure gauges, flow meters and regulating valves for various media to ensure that each subsystem works normally according to a certain timing, and to display and monitor the working parameters of the spraying system 51. When the system works beyond the normal process parameter range, it will automatically alarm and make corresponding processing to ensure the normal operation of the system.

[0044] like Figure 1 , 2 As shown, a universal roller 12 is provided at the bottom of the spraying room 1, so that the spraying room can be moved and the spraying work is convenient. The wall panel of the spraying room 1 is provided with soundproof cotton, and a soundproof door 15 is provided at the rear side of the spraying room 1. The air making room 2, the air supply room 3, the powder delivery room 4 and the spraying room 5 are all provided with transparent windows 16. The air making room 2 and the air supply room 3, the air supply room 3 and the powder delivery room 4, and the powder delivery room 4 and the spraying room 5 are all provided with isolation doors. The top plate of the spraying room 5 is provided with a clamping device for fixing the parts to be sprayed.

[0045] The object to be sprayed is fixed by a clamping device, and then the center of the object to be sprayed is positioned, and the object to be sprayed is scanned by a 3D scanner 515 to generate three-dimensional image pixels, and the spraying path is set by arranging the plurality of pixels in an order according to their positions, and the control device issues instructions to control the spray gun 513 to spray the product. After the spraying is completed, the object is scanned again by the 3D scanner 515 to generate three-dimensional image pixels. When defects occur, the product is processed in subsequent steps, that is, according to the above method, the robot arm 511 grabs the grinding and polishing head 514 to polish the defects of the sprayed object. After the processing is completed, the product that has been processed multiple times is scanned by the 3D scanner 515 to generate three-dimensional image pixels. After the inspection is correct, the finished sprayed product is obtained.

[0046] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A mobile supersonic flame spraying equipment, characterized in that: The invention comprises a movable spraying room, which is provided with an air making chamber, an air supply chamber, a powder delivery chamber and a spraying room in sequence from back to front, the air making chamber is provided with an air making system for preparing compressed air, the air supply chamber is provided with an air supply system for providing combustion gas, the powder delivery chamber is provided with a powder delivery system for conveying spray powder, and the spraying room is provided with a spraying system for supersonic flame spraying; the spraying system comprises a mechanical arm, a suspension frame, a spray gun, a grinding and polishing head and a 3D scanner, a track is provided horizontally on the floor of the spraying room, the mechanical arm is slid on the track, the suspension frame is fixed on the floor of the spraying room, the spray gun, the grinding and polishing head and the 3D scanner are hung on the suspension frame, and the spray gun is connected with the air making system, the air supply system and the powder delivery system respectively through pipelines.

2. The mobile supersonic flame spraying equipment according to claim 1, characterized in that: The suspension frame comprises a bracket, and a plurality of brackets are arranged along the circumferential direction of the bracket. The bracket is provided with a C-shaped slot opening outward, and a spray gun, a grinding and polishing head and a 3D scanner are respectively hung on the C-shaped slots of the plurality of brackets.

3. The movable supersonic flame spraying equipment according to claim 1 is characterized in that: The spray gun includes a spray gun body with an inner cavity, the front end of the spray gun body is provided with a spray pipe connected with the inner cavity, the rear end of the spray gun body is respectively provided with an oxygen delivery pipe, an acetylene delivery pipe and a spray powder pipe connected with the inner cavity, and the rear side of the spray powder pipe is respectively connected with a compressed air delivery pipe and a spray powder delivery pipe.

4. The movable supersonic flame spraying equipment according to claim 3 is characterized in that: The inner cavity of the nozzle is tapered from inside to outside, narrow inside and wide outside. The angle between the inner wall of the nozzle and the axis of the nozzle is α, and α is 0.001-0.01°.

5. The movable supersonic flame spraying equipment according to claim 3 is characterized in that: The gas production system comprises an air compressor, an air dryer and an air storage tank which are connected in sequence. The outlet of the air storage tank is connected to a compressed air delivery pipe through a pipeline. A first flow control valve is arranged on the pipeline at the outlet of the air storage tank.

6. The movable supersonic flame spraying equipment according to claim 5, characterized in that: An air purifier and a flow controller are also connected in series on the outlet pipeline of the gas storage tank.

7. The movable supersonic flame spraying equipment according to claim 3 is characterized in that: The gas supply system includes an oxygen cylinder and an acetylene cylinder, which are connected to an oxygen delivery pipe and an acetylene delivery pipe through pipelines, respectively. A second flow control valve and a third flow control valve are connected to the pipeline of the oxygen cylinder and the pipeline of the acetylene cylinder, respectively.

8. The movable supersonic flame spraying equipment according to claim 3 is characterized in that: The powder feeding system includes a powder feeder for containing spray powder, the oxygen cylinder is connected to the inlet of the powder feeder through a pipeline, the outlet of the powder feeder is connected to the spray powder delivery pipe through a pipeline, and the pipeline at the outlet of the powder feeder is connected to a fourth flow control valve.

9. The movable supersonic flame spraying equipment according to claim 1, characterized in that: The air making chamber, the air supply chamber and the powder delivery chamber are respectively provided with air inlets and air outlets, the air inlets and air outlets are arranged opposite to each other and are located at the upper part of the two lateral walls of the spraying room, and a dust collector is also provided in the spraying room.

10. The movable supersonic flame spraying equipment according to claim 1, characterized in that: The bottom of the spray room is provided with a universal roller, the wall panel of the spray room is provided with sound insulation cotton, the rear side of the spray room is provided with a sound insulation door, the air making chamber, the air supply chamber, the powder delivery chamber and the spray room are all provided with transparent windows, the air making chamber and the air supply chamber, the air supply chamber and the powder delivery chamber, and the powder delivery chamber and the spray room are all provided with isolation doors, and a clamping device for fixing the workpiece to be sprayed is provided on the top plate of the spray room.

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