Paint fading method for aircraft component

Abstract

The invention discloses a paint fading method for an aircraft component, which can improve the production efficiency, and comprises the following steps: (1) chemical paint fading: coating the surface of the part of the aircraft component to be subjected to paint fading with a paint fading agent, and then carrying out paint fading reaction to loosen a paint layer and strip the paint layer from the aircraft component; after the reaction is finished, washing the surface of the aircraft component with water to remove a stripped paint layer, and finally, carrying out water-cutting air drying with compressed air to remove all liquid on the surface of the aircraft component and in a bearing hole; and (2) sand blasting and paint fading are conducted, specifically, the aircraft component subjected to chemical paint fading treatment in the step (1) is fed into a sand blasting machine to be subjected to sand blasting till a paint layer on the surface of the part, needing paint fading, of the aircraft component is completely removed, and paint fading is completed.

Description

Technical Field

[0001] The present invention relates to the technical field of aircraft maintenance, and particularly to a method for removing paint from aircraft components. Background Art

[0002] With the booming development of the civil aviation industry, each airline has vigorously expanded its fleet size. In order to ensure the safe and stable operation of flights, airlines need to regularly inspect and maintain various components of the aircraft. The main aircraft components to be sent for repair include: wheels, brake master cylinders, heat exchangers, etc., and the maintenance steps include paint removal and painting.

[0003] Facing the increasing volume of repair business while ensuring the painting quality and the timely delivery of the aircraft, this poses a severe test for the maintenance manufacturers. In order to better improve the painting quality, the paint removal quality before painting is particularly important. According to the existing maintenance manuals and construction specifications, methods such as sandpaper grinding, sandblasting, shot peening, and chemical paint removal can be used to remove paint from aircraft components such as wheels, heat exchangers, and brake master cylinders; currently, maintenance manufacturers usually choose one of the above methods to remove paint from aircraft components. However, the production efficiency of using sandpaper grinding, sandblasting, and shot peening for paint removal is very low. For example, sandblasting can only complete the paint removal of 4 sets of aircraft wheels in one day (8 hours), which cannot meet the existing production capacity requirements. Chemical paint removal often cannot achieve 100% paint removal in order to ensure that the body of the aircraft component is not corroded by the paint remover, and the paint removal effect is not good.

[0004] In addition, the existing chemical paint removal process is to manually brush the paint remover on the surface of the aircraft component, and then perform manual rinsing after the paint layer falls off. However, since the paint remover is a strongly corrosive and pungent-smelling solution, it is extremely harmful to human organs such as the skin, respiratory tract, and eyes. Therefore, it poses a great hazard to the safety and health of the operators during the entire chemical paint removal operation. Moreover, the existing chemical paint removal process uses manual brushing of the paint remover and manual rinsing, resulting in low production efficiency and a decline in the paint removal effect. Summary of the Invention

[0005] The purpose of the present invention is to provide a method for removing paint from aircraft components to improve production efficiency.

[0006] To achieve the above purpose, the present invention provides the following technical solutions.

[0007] A method for removing paint from aircraft components, comprising the following steps:

[0008] (1) Chemical paint removal: Make the surface of the part of the aircraft component to be painted with the paint remover, and then carry out the paint removal reaction to make the paint layer loose and peeled off from the aircraft component; after the reaction is completed, rinse the surface of the aircraft component with water to remove the peeled paint layer, and finally use compressed air for water cutting and air drying to remove all the liquid on the surface of the aircraft component and in its bearing holes;

[0009] (2) Sandblasting paint stripping: Feed the aircraft components that have undergone chemical paint stripping in step (1) into a sandblasting machine for sandblasting until the paint layer on the surface of the parts of the aircraft components that need paint stripping is completely removed, thus completing the paint stripping.

[0010] The method of the present invention is applicable to different types of aircraft components, including wheel hubs, heat exchangers, master brake cylinders, etc.

[0011] The present invention uses an automatic chemical paint stripping device to complete the steps of the chemical paint stripping; the automatic chemical paint stripping device includes an equipment housing, and a dipping tank, a spraying tank, a reaction tank, a flushing and air-drying tank, a paint stripping agent storage tank, a single-arm gantry manipulator, and a PLC programmable controller provided inside the equipment housing;

[0012] The dipping tank is used for dipping the aircraft components with the paint stripping agent therein;

[0013] The spraying tank is used for spraying the aircraft components with the paint stripping agent therein, and a spraying pipe is provided inside it; the spraying pipe in the spraying tank is connected to the liquid outlet of the paint stripping agent storage tank through a spraying pump, and its drain outlet is also connected to the waste liquid inlet of the paint stripping agent storage tank, thereby forming a circulating spraying system;

[0014] The reaction tank is used for the paint stripping reaction of the aircraft components coated with the paint stripping agent;

[0015] The flushing and air-drying tank is provided with a spraying and air-drying pipe for flushing and water-shedding air-drying of the aircraft components after the paint stripping reaction;

[0016] The single-arm gantry manipulator is used to drive the aircraft components to move into each tank for processing;

[0017] The PLC programmable controller is used to control the single-arm gantry manipulator, pumps, and valves in the equipment according to the technological process and time.

[0018] The present invention uses the automatic chemical paint stripping device to realize the mechanized operation of chemical paint stripping, and its steps include: ① Move the aircraft components to the dipping tank to dip the paint stripping agent, or move them to the spraying tank to spray the paint stripping agent; ② Then send the aircraft components to the reaction tank for the paint stripping reaction to make the paint layer loose and peel off from the aircraft components; ③ After the reaction is completed, move the aircraft components to the flushing and air-drying tank, wash with water to remove the peeled paint layer, and finally use compressed air for water-shedding air-drying to remove all the liquid on the surface of the aircraft components and in their bearing holes. Using the automatic chemical paint stripping device can process multiple aircraft components in batches at the same time.

[0019] Preferably, after the aircraft components are dipped with the paint stripping agent in the dipping tank or sprayed with the paint stripping agent in the spraying tank, they stay above the liquid level in the tank for 5 - 10 minutes to make the paint stripping agent fall back into the tank as much as possible, so as to reduce the loss and waste of the paint stripping agent.

[0020] Preferably, the time for the paint stripping reaction is 2.5 to 5 hours. This reaction time can cause the paint film to fall off while avoiding corrosion damage to the aircraft component body.

[0021] Preferably, the spray drying pipe in the flushing and air drying tank is connected to a high-pressure blower through a valve and can also be connected to a compressed hot air source. Different air sources can be switched to thoroughly dry the aircraft components after flushing.

[0022] Furthermore, the automatic chemical paint stripping equipment further includes a water storage tank, which is arranged inside the equipment housing; the spray drying pipe in the flushing and air drying tank is connected to the liquid outlet of the water storage tank through a spray pump and a valve, and its drain outlet is also connected to the waste liquid inlet of the water storage tank; the water storage tank is arranged inside the equipment housing and is connected to a clear water pipeline. In this way, the spray drying pipe serves as both a spraying mechanism and a water draining and air drying mechanism, and its function can be switched through a valve.

[0023] Preferably, in the flushing and air drying tank, the aircraft components are flushed with water at a water pressure of 20 to 30 Psig; water draining and air drying are performed using dry and oil-free compressed air at 20 to 30 Psi.

[0024] Preferably, a solid-liquid separator is arranged between the liquid outlet and the waste liquid inlet of the water storage tank to prevent paint waste residues from entering the spray drying pipe in the flushing and air drying tank. Similarly preferably, a solid-liquid separator is arranged between the liquid outlet and the waste liquid inlet of the paint stripping agent storage tank to prevent paint waste residues from entering the spray pipe in the dipping and coating tank. The solid-liquid separator is a filter screen or a filter basket.

[0025] Preferably, a filter is provided on the connecting pipeline between the liquid outlet of the paint stripping agent storage tank and the spray pipe in the dipping and coating tank; a filter is provided on the connecting pipeline between the liquid outlet of the water storage tank and the spray drying pipe in the flushing and air drying tank; further preventing the influence of paint waste residues on the paint stripping operation and improving reliability. The filter is a stainless steel core type filter.

[0026] Preferably, the tops of the dipping tank, the dipping and coating tank, the reaction tank, and the flushing and air drying tank are all equipped with tank covers, which can be electric or pneumatic and are controlled by a PLC programmable controller for their opening and closing.

[0027] Preferably, the tank bodies of the dipping tank, the dipping and coating tank, the reaction tank, the flushing and air drying tank, the paint stripping agent storage tank, and the water storage tank are all formed by welding stainless steel plates. The single-arm gantry manipulator is also made of stainless steel.

[0028] Preferably, the waste liquid outlets of the dipping tank, the reaction tank, the paint stripping agent storage tank, and the water storage tank are connected to the main sewage pipe. The dipping tank, the reaction tank, and the paint stripping agent storage tank are respectively connected to the clear water pipeline.

[0029] Furthermore, a set of exhaust pipes is installed on the top of the automatic chemical paint stripping equipment and connected to the main exhaust pipe.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] Compared with using a single method (such as sandpaper grinding, sandblasting, shot peening, chemical paint stripping, etc.), the present invention combines chemical paint stripping and sandblasting paint stripping to improve production efficiency. Moreover, through repeated research and evidence collection, the combination of chemical paint stripping and sandblasting paint stripping in the present invention has the best paint stripping effect and the highest efficiency; among them, chemical paint stripping is carried out first and then sandblasting paint stripping, which can achieve a 100% paint stripping effect on aircraft components without being corroded by the paint stripper, and chemical paint stripping first can greatly reduce the operation time of subsequent sandblasting paint stripping to the target effect, thus improving production efficiency.

[0032] The present invention uses an automatic chemical paint stripping equipment to improve the effect of chemical paint stripping, and further improves production efficiency when combined with sandblasting paint stripping. Furthermore, using the automatic chemical paint stripping equipment to realize the mechanized treatment of chemical paint stripping can reduce the harm to operators caused by long-term direct contact with the paint stripper and ensure the physical health of operators. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic structural diagram of the automatic chemical paint stripping equipment of the present invention.

[0034] Reference numerals: 1 - equipment outer cover, 2 - dipping tank, 3 - spraying tank, 4 - reaction tank, 5 - rinsing and air drying tank, 6 - paint stripper storage tank, 7 - water storage tank, 8 - circulating liquid flow pipeline, 9 - spray pipe, 10 - spray and air drying pipe, 11 - high-pressure blower, 12 - compressed hot air source, 13 - solid-liquid separator, 14 - clear water pipeline, 15 - main sewage pipe, 16 - filter, 17 - pump, 18 - valve. DETAILED DESCRIPTION OF THE INVENTION

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0036] As Figure 1 shown, the automatic chemical paint stripping equipment adopted by the present invention includes an equipment outer cover 1, and a dipping tank 2, a spraying tank 3, a reaction tank 4, a rinsing and air drying tank 5, a paint stripper storage tank 6, a water storage tank 7, a single-arm gantry manipulator and a PLC programmable controller arranged inside the equipment outer cover 1.

[0037] The dipping tank 2 is used for dipping the aircraft parts with paint stripper. Its tank body is welded by SUS304 δ2.0mm stainless steel plates. There is 10mm thermal insulation cotton pasted on the outside of the tank body, and a pneumatic tank cover is installed on the top. Stainless steel heating rods are provided inside the dipping tank 2. A circulating liquid flow pipeline 8 with a pump 17 and a filter 16 is arranged outside the dipping tank. The liquid inlet of this pipeline is located at the bottom of the dipping tank, and the liquid outlet is located at the upper part of the dipping tank.

[0038] The spraying tank 3 is used for spraying the aircraft parts with paint stripper. Its tank body is welded by SUS304 δ2.0mm stainless steel plates. There is 10mm thermal insulation cotton pasted on the outside of the tank body, stainless steel heating rods are provided inside, and a pneumatic tank cover is installed on the top. Spraying pipes 9 are installed on both sides of the tank body of the spraying tank, with three rows of spraying pipes 9 on each side, and 11 nozzles are installed on each row of pipes. The spraying pipes 9 are connected to the liquid outlet of the paint stripper storage tank 6 through a spraying pump 17 and a filter 16, and its drain outlet is also connected to the waste liquid inlet of the paint stripper storage tank 6. The paint stripper storage tank 6 is used for storing paint stripper and supplying paint stripper to the spraying tank 3. Its tank body is welded by SUS304 δ1.5mm stainless steel plates. There is 10mm thermal insulation cotton pasted on the outside of the tank body, and stainless steel heating rods are provided inside. A solid-liquid separator 13, which is a filter screen or a filter basket, is installed between the liquid outlet and the waste liquid inlet of the paint stripper storage tank 6. During the operation, the liquid in the paint stripper storage tank is pumped through the spraying pump, injected into the spraying pipes after passing through the filter, and then sprayed out by the nozzles to spray the aircraft parts. The waste liquid then flows back into the paint stripper storage tank, forming a set of circulating spraying system. A low liquid level protection device and a manual liquid filling port are also set inside the paint stripper storage tank 6. When the liquid level is too low, an automatic alarm will prompt the operator to add liquid to the tank.

[0039] The reaction tank 4 has a tank body welded by SUS304 δ2.0mm stainless steel plates and a pneumatic tank cover installed on the top. It is used for the paint stripping reaction of the aircraft parts that have been processed by the dipping tank or the spraying tank. During the operation, after the aircraft parts are dipped or sprayed with paint stripper, they are moved to the reaction tank and left standing for the paint stripping reaction.

[0040] The flushing and air drying tank 5 is used for flushing and air drying the aircraft parts after the paint stripping reaction. Its tank body is welded by 304 plates δ3mm. A pneumatic tank cover is installed on the top. Spraying and air drying pipes 10 are provided inside the tank, which serve as both a spraying mechanism and a water cutting and air drying mechanism. Specifically, the spraying and air drying pipes 10 are installed on both sides of the tank body, with seven rows of spraying and air drying pipes 10 on each side, and 11 nozzles are installed on each row of pipes. The spraying and air drying pipes 10 are connected to the liquid outlet of the water storage tank 7 through a spraying pump 17, a filter 16, and a valve 18, and its drain outlet is also connected to the waste liquid inlet of the water storage tank 7. The spraying and air drying pipes 10 are also respectively connected to a high-pressure blower 11 and a compressed hot air source 12 through corresponding valves 18.

[0041] The tank body of the water storage tank 7 is welded by SUS304 δ1.5mm stainless steel plates, and a solid-liquid separator 13, which is a filter screen or a filter basket, is installed between the liquid outlet and the waste liquid inlet.

[0042] During the operation, the liquid in the water storage tank is pumped by the spray pump, injected into the spray air drying pipe through the filter, and then the solution is sprayed out by the nozzle to spray and wash the aircraft parts in the washing and air drying tank, and the waste water flows back into the water storage tank; after washing, the high-pressure fan is switched by the valve to perform water cutting and air drying on the aircraft parts; after the water cutting and air drying are completed, hot air can also be introduced for drying.

[0043] The single-arm gantry manipulator, including a transverse movement mechanism, a lifting mechanism and a manipulator, is located above the dipping tank, the spraying tank, the reaction tank and the washing and air drying tank, and is used to drive the aircraft parts to move correspondingly into each tank for processing during operation.

[0044] The PLC programmable controller controls the operation of the single-arm gantry manipulator, pumps, valves, pneumatic tank covers, heating rods, etc. in the equipment.

[0045] The dipping tank 2, the reaction tank 4, the paint stripper storage tank 6 and the water storage tank 7 are respectively connected to the clean water pipeline 14; the waste liquid outlets of the dipping tank 2, the reaction tank 4, the paint stripper storage tank 6 and the water storage tank 7 are connected to the total sewage pipe 15. A group of exhaust pipes are installed at the top of the equipment and connected to the total exhaust pipe.

[0046] Example 1

[0047] Taking the main hub of the aircraft part wheel hub B737-800 as an example, the paint stripping is carried out according to the following steps:

[0048] (1) Chemical paint stripping:

[0049] ① Before chemical paint stripping, use masking tape to shield and protect the parts that do not need paint stripping, and expose the parts that need paint stripping; keep the surface of the aircraft parts dry; put the aircraft parts into the stainless steel hanging basket and move them to the feeding table of the chemical paint stripping equipment; at room temperature, preferably below 26°C, carry out chemical paint stripping.

[0050] ② Turn on the automatic chemical paint stripping equipment and use the semi-automatic or full-automatic mode of the PLC programmable controller; inject the paint stripper CEE-BEE R-256 (SAE-AMS-1375) into the dipping tank or the paint stripper storage tank;

[0051] ③ The manipulator moves the stainless steel hanging basket with the aircraft parts into the dipping tank and stays briefly in the paint stripper for one second. After the aircraft parts are coated with the paint stripper, immediately move the aircraft parts above the liquid level in the dipping tank; stay above the liquid level for 5-10 minutes (the stay time depends on the amount of the paint stripper coated on the aircraft parts), so that the paint stripper can fall back into the dipping tank as much as possible to reduce the loss and waste of the paint stripper.

[0052] Alternatively, a manipulator moves a stainless-steel hanging basket containing aircraft components into the dip-coating tank; then, the paint remover stored in the paint remover storage tank is pumped to the spray pipe and sprayed onto the aircraft components until the surfaces of the aircraft components are evenly covered with the paint remover; after spraying, the aircraft components stay for 5 to 10 minutes to allow the paint remover to fall back into the dip-coating tank as much as possible, and the excess paint remover flows back to the paint remover storage tank and is reused after filtration.

[0053] ④ Move the aircraft components with the paint remover onto the reaction tank for reaction, allowing the paint remover to penetrate the paint layer and make it loose and peeled; for the wheel hub of this embodiment, specifically, the reaction time is 2.5 to 3 hours.

[0054] ⑤ After the reaction is completed, lift the aircraft components into the flushing and air-drying tank, and spray municipal water with a water pressure of 20 to 30 Psig through the spray and air-drying pipe to spray and wash the aircraft components from multiple angles to remove the loose and peeled paint layer as much as possible; after flushing, the spray and air-drying pipe is converted into a water-shedding and air-drying mechanism, and the high-pressure blower is turned on to use dry and oil-free compressed air at 20 to 30 Psi to remove all the liquid on the surface of the aircraft components and in their bearing holes to prevent the residual paint remover from corroding the components; it can also be switched to a compressed hot air source to introduce dry and oil-free hot air at 20 to 30 Psi to thoroughly dry the aircraft components.

[0055] ⑥ After the above step ⑤ is completed, the chemical paint removal is completed, and a manipulator moves the aircraft components out to the discharge table; take out the aircraft components that have completed chemical paint removal from the equipment.

[0056] At this time, upon inspection of the aircraft components, it is found that the paint removal effect reaches over 70%.

[0057] (2) Sandblasting paint removal:

[0058] ① Use a sandblaster of model P400S from ODLINGS MCR Company in the UK to fix the rinsed, dried, and incompletely paint-removed aircraft components in the main cabin of the sandblaster.

[0059] ② Turn on the compressed air source, power supply, and lamp switch of the sandblaster, prepare the foot switch, and close the cabin door of the sandblaster.

[0060] ③ Put on the rubber sandblasting gloves in the main cabin of the sandblaster, hold the sandblasting gun with a caliber of 10 mm, and the sand material ejected is 20 - 30 mesh MIL-P-85891 Type II plastic sand. Adjust the best distance between the sandblasting gun and the aircraft components to 30 - 40 mm, and continuously rotate the anti-static rotating plate until the surface paint layer is completely removed.

[0061] ④ After the paint layer is completely removed, use the built-in gun of the sandblaster to eject clean compressed air without water, oil, and solid particles at 20 - 30 Psi to remove all the dust from the sandblasted components.

[0062] After the above steps, 100% paint stripping of the aircraft component is completed. Using the method of this embodiment, 12 sets of aircraft components can be paint-stripped in one day (8 hours).

[0063] Comparative Example 1

[0064] The main hub of the aircraft component wheel hub B737-800 is paint-stripped by using the existing chemical paint stripping method combined with sandblasting paint stripping.

[0065] The difference between Comparative Example 1 and Example 1 in the chemical paint stripping step is that the paint stripper for the aircraft component is applied by manual brushing, and the aircraft component is manually rinsed and dried after the paint stripping reaction is completed; the sandblasting paint stripping step is the same as that of Example 1.

[0066] After the chemical paint stripping step, it is found by inspecting the aircraft component that only 50-60% paint stripping effect is achieved.

[0067] Due to the low efficiency of manual chemical paint stripping and the poor effect resulting in an extended sandblasting time, therefore, using the method of Comparative Example 1, only 8 sets of aircraft components can be paint-stripped in one day (8 hours).

[0068] Comparative Example 2

[0069] The main hub of the aircraft component wheel hub B737-800 is chemically paint-stripped by using the existing chemical paint stripping method.

[0070] The difference between Comparative Example 2 and Comparative Example 1 is that the aircraft component is not sandblasted for paint stripping, and the aircraft component is chemically paint-stripped alone.

[0071] As in the result of Comparative Example 1, at this paint stripping reaction time, manual chemical paint stripping cannot make the aircraft component achieve 100% paint stripping effect; if the paint stripping reaction time is appropriately extended while ensuring that the component is not corroded, at most 70% paint stripping effect can be achieved.

[0072] Comparative Example 3

[0073] The main hub of the aircraft component wheel hub B737-800 is sandblasted for paint stripping.

[0074] The difference between Comparative Example 3 and Example 1 is that the aircraft component is not chemically paint-stripped, and sandblasting paint stripping is used until 100% paint stripping is completed.

[0075] Using the method of Comparative Example 3, only 4 sets of aircraft components can be paint-stripped in one day (8 hours).

Claims

1. A paint stripping method for an aircraft component, characterized in that, It includes the following steps: (1) Chemical paint stripping: Apply a paint stripper to the surface of the area of the aircraft component that needs to have the paint stripped, and then carry out the paint stripping reaction to make the paint layer loose and peel off from the aircraft component; after the reaction is completed, rinse the surface of the aircraft component with water to remove the peeled paint layer, and finally use compressed air to drain the water and dry it to remove all the liquid on the surface of the aircraft component and in its bearing holes; (2) Sandblasting paint stripping: Feed the aircraft component that has been chemically paint stripped in step (1) into a sandblaster and carry out sandblasting until the paint layer on the surface of the area of the aircraft component that needs to have the paint stripped is completely removed, thus completing the paint stripping.

2. The paint stripping method for aircraft components according to claim 1, characterized in that, The step of chemical paint stripping is completed by using an automatic chemical paint stripping device; The automatic chemical paint stripping device includes an equipment outer cover, and a dipping tank, a spraying tank, a reaction tank, a rinsing and air-drying tank, a paint stripper storage tank, a single-arm gantry manipulator, and a PLC programmable controller arranged inside the equipment outer cover; The dipping tank is used for dipping the aircraft component with the paint stripper therein; The spraying tank is used for spraying the aircraft component with the paint stripper therein, and a spraying pipe is arranged inside it; the spraying pipe in the spraying tank is connected to the liquid outlet of the paint stripper storage tank through a spraying pump, and its drain outlet is also connected to the waste liquid inlet of the paint stripper storage tank, thereby forming a circulating spraying system; The reaction tank is used for carrying out the paint stripping reaction on the aircraft component coated with the paint stripper; The rinsing and air-drying tank is provided with a spraying and air-drying pipe for rinsing and draining the water and drying the aircraft component after the paint stripping reaction; The single-arm gantry manipulator is used to drive the aircraft component to move into each tank for treatment; The PLC programmable controller is used to control the single-arm gantry manipulator, pumps, and valves inside the equipment according to the technological process and time.

3. The paint stripping method for aircraft components according to claim 2, characterized in that, The steps of chemical paint stripping using the automatic chemical paint stripping device include: ① Move the aircraft component to the dipping tank to dip the paint stripper, or move it to the spraying tank to spray the paint stripper; ② Then send the aircraft component into the reaction tank for the paint stripping reaction to make the paint layer loose and peel off from the aircraft component; ③ After the reaction is completed, move the aircraft component to the rinsing and air-drying tank, rinse it with water to remove the peeled paint layer, and finally use compressed air to drain the water and dry it to remove all the liquid on the surface of the aircraft component and in its bearing holes.

4. The paint stripping method for aircraft components according to claim 3, characterized in that the aircraft After the component dips the paint stripper in the dipping tank or sprays the paint stripper in the spraying tank, it stays above the liquid level in the tank for 5 - 10 minutes to make the paint stripper fall back into the tank as much as possible to reduce the loss and waste of the paint stripper.

5. The paint stripping method for aircraft components according to claim 4, characterized in that, The time of the paint stripping reaction is 2.5 - 5 hours.

6. The paint stripping method for aircraft components according to claim 5, characterized in that, during In the rinsing and air-drying tank, rinse the aircraft component with water with a water pressure of 20 - 30 Psig; use dry and oil-free compressed air of 20 - 30 Psi for draining the water and drying.

7. The paint stripping method for aircraft components according to claim 6, characterized in that, The automatic chemical paint stripping device further includes a water storage tank arranged inside the equipment outer cover, which is connected to a clear water pipeline; The spraying and air-drying pipe in the rinsing and air-drying tank is connected to the liquid outlet of the water storage tank through a spraying pump and a valve, and its drain outlet is also connected to the waste liquid inlet of the water storage tank; the spraying and air-drying pipe is also connected to a high-pressure blower through a valve, making it both a spraying mechanism and a water-draining and air-drying mechanism.

8. The paint stripping method for aircraft components according to claim 7, characterized in that, in A solid-liquid separator is provided between the liquid outlet and the waste liquid inlet of the water storage tank to prevent paint waste residues from entering the spray drying pipe of the flushing and air drying tank. Similarly, a solid-liquid separator is provided between the liquid outlet and the waste liquid inlet of the paint remover storage tank to prevent paint waste residues from entering the spray pipe of the dip coating tank. The solid-liquid separator is a filter screen or a filter basket.

9. The paint stripping method for aircraft components according to claim 8, characterized in that, On the connecting pipes between the liquid outlet of the paint remover storage tank and the spray pipe in the dip coating tank, and between the liquid outlet of the water storage tank and the spray drying pipe in the flushing and air drying tank, there are stainless steel core filters.

10. The paint stripping method for aircraft components according to claim 9, characterized in that, The tops of the dip coating tank, the spray coating tank, the reaction tank and the flushing and air drying tank are all equipped with electric or pneumatic tank covers, and their opening and closing are controlled by a PLC programmable controller.

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