Coating process for transformer chip heat sink

Abstract

The application discloses a transformer sheet radiator coating process method, relates to the technical field of transformer oil dirt removal, and comprises the following steps: sheet scattering processing welding, sheet scattering processing welding, sheet scattering internal treatment, and sheet scattering external treatment steps, wherein the sheet scattering external treatment further comprises the following steps: sheet scattering external shot blasting, sheet scattering external oil removal, sheet scattering rust inhibitor immersion, water immersion, and sheet scattering external paint spraying; the shot blasting system needs to be regularly cleaned by shot blasting with oxide scale waste to remove oil dirt in the shot blasting system; oil is removed by using a cleaning agent; a layer of protective film is formed on the sheet scattering by immersing the sheet scattering in the rust inhibitor to prevent rusting; then the sheet scattering is immersed in water containing a small amount of rust inhibitor, and is dried by self-drying or hot air blowing; the sheet scattering can be guaranteed to be rust-free within 72 hours; and the whole process method greatly improves the adhesion and corrosion resistance of the sheet scattering paint.

Description

Technical Field

[0001] This invention relates to a coating process for transformer plate radiators. Background Technology

[0002] Currently, the common pretreatment coating process for sheet metal is as follows: sheet metal steel plate felt oiling or laser degreasing --- sheet metal welding --- sheet metal pressure repair welding --- sheet metal shot blasting --- filling of inner wall paint --- hot air drying of inner wall paint --- sheet metal exterior primer coating --- sheet metal exterior drying --- sheet metal exterior topcoat coating --- sheet metal exterior drying.

[0003] The disadvantages of this process are: ① Felt degreasing: The degreasing rate of the felt flakes is poor on the surface and inside, leaving residual oil on the surface, resulting in poor paint film adhesion and easy peeling. The degreasing rate of felt is about 70-30%. The degreasing effect is good when the felt is newly installed, but the degreasing effect deteriorates as the oil content increases with use, with an average degreasing rate of about 50%.

[0004] ② Laser degreasing: Thoroughly removes oil from the surface or interior of the flakes. Flakes are prone to rust during production, and subsequent rust removal is ineffective, resulting in poor paint adhesion and easy peeling. Laser degreasing is relatively thorough, but the steel plate may rust during production, and the rust inside the flakes cannot be removed, affecting the corrosion resistance of the inner paint.

[0005] ③ Shot blasting can remove oil. This is fine when the shot is new and the machine is new. However, after several months of use, the steel shot and the shot blasting system will contain oil. The surface of the steel plate after shot blasting will have oil stains and will be dark black instead of shiny. This indicates that oil and dust are adhering to the surface of the steel plate. Applying paint directly after shot blasting will affect the adhesion and corrosion resistance. Summary of the Invention

[0006] To solve the above-mentioned technical problems, the present invention provides a coating process method for transformer plate heat sinks, the technical solution of which is as follows: The process includes the following steps: sheet processing and welding, sheet pressure repair welding, sheet internal treatment, and sheet external treatment. S1, sheet metal processing and welding, uses lightly oiled cold-rolled steel plates. The front end of the sheet metal production line uses oil-absorbing cotton to remove oil, eliminating the need for expensive laser degreasing equipment. At the end of the sheet metal production line, a 2-meter-long handling robot is used in conjunction with pneumatic clamps to directly and accurately place the heat sinks from the production line onto the sheet metal CNC assembly machine. The heat sinks and oil collection pipes are manually fixed, and then a welding machine and a six-axis robot are used to perform full welding between the heat sinks and the oil collection pipes. S2, pressure testing and welding of the loose material: Install a pressure testing flange on the end of the loose material's oil collection pipe, hoist the loose material into a clean water tank, inflate it with 0.2MPa of air, illuminate the weld seam with a strong flashlight, mark any leaks with a stone pencil, thoroughly check all weld seams, release the gas until the pressure is 0, then weld the marked leak points; inflate again with 0.2MPa of air to find and weld any remaining air bubbles; if no leaks are found, place the loose material in a pressure holding tank and hold it for 30 minutes, maintaining a pressure of 0.2MPa for compliance. S3, internal processing of flakes and bulk materials, including internal cleaning agent rinsing and degreasing of flakes and bulk materials, internal drying of flakes and bulk materials, and internal coating of the inner wall of the can. S3-1, internal cleaning agent for degreasing of flakes and powders. First, rinse the inside of the flakes and powders with a cleaning agent at 5~45℃ and pH value 12-13. Use a water pump to circulate and rinse for 5-7 minutes. Then rinse with clean water and 1-2% cleaning and rust inhibitor for 3 minutes. Then stand the flakes and powders upright to drain until no more water drips. S3-2, Drying the inside of the flakes: After draining, the inside of the flakes is dried with a hot air blower. S3-3, the inner wall paint of the flakes is filled with a diaphragm pump, with the paint flowing out from the bottom and the top. The paint only needs to flow out for 5-8 seconds. Then the flakes are placed upright to drain the paint completely. Finally, the inner wall paint is dried with hot air. S4, external treatment of flakes, including external shot blasting of flakes, external degreasing of flakes, immersion in flake rust inhibitor, immersion in water with 1-2% rust inhibitor (the above three stations need to be equipped with iron powder and dust filtration devices) and external spraying of flakes. S4-1, external shot blasting of loose metal, with the oil collection pipe sealed with a flange plate, and a track-through shot blasting system is used to blast the surface of loose metal. The shot diameter is 0.8mm. Since there is oil on the surface of the loose metal plate, the oil stains of the shot blasting system need to be cleaned regularly (generally every 7-10 days) with waste containing oxide scale for several hours each time until the metal surface is bright. S4-2, external degreasing of flakes, using cleaning agent immersion to remove oil. The water tank is made according to the size of the flakes. It is recommended to make a steel plate water tank with a length of 3 meters, a width of 2 meters, and a depth of 0.8 meters, and a height of 0.7 meters, for a total volume of 4.2 cubic meters. The cleaning agent accounts for about 6-8% of the volume. The pH value is required to be 12-13. The pH value is maintained by adding cleaning agent every day during production. The water tank is cleaned and the tank solution is completely replaced every 30 days. S4-3, rust inhibitor immersion: The water tank is constructed according to the size of the flakes. It is recommended to construct a steel plate water tank with a length of 3 meters, a width of 2 meters, a depth of 0.8 meters, and a height of 0.7 meters, for a total volume of 4.2 cubic meters. The rust inhibitor should account for about 6-8% of the volume, and the pH value should be 8-9. Immerse the flakes in the rust inhibitor for 2-3 minutes. Add the rust inhibitor daily to maintain the pH value. Clean the water tank and completely replace the solution every 30 days. S4-4 is rinsed with clean water. The water tank is made according to the size of the flakes. It is recommended to make a steel plate water tank with a length of 3 meters, a width of 2 meters, and a depth of 0.8 meters, and a height of 0.7 meters, for a total volume of 4.2 cubic meters. Add 1-2% rust inhibitor to tap water to clean the surface of the flakes, and then let it air dry, air dry, or dry at 70-80℃. Clean the water tank thoroughly and change the tank solution every 3 days. S4-5, Iron powder and dust filtration device. S4-2, S4-3, and S4-4 all require filtration devices, as shown in the figure below. After three stages of filtration and one stage of iron powder magnetic attraction, the water in the pool is continuously filtered. The first stage filter cotton has a pore size of 100 microns, the second stage filter cotton has a pore size of 50 microns, and the third stage filter cotton has a pore size of 10 microns. Magnetic rods are installed at the water outlet, with a gap of 2-3 mm between the two magnetic rods.

[0007] S4-6, external coating of flakes, two coats of primer for C3 environment and three coats for C5 environment, drying after each coat, then one to two coats of topcoat, leveling, removing drips and spraying on the sides of the flakes, and then drying in the oven.

[0008] Furthermore, the cleaning agent is composed of potassium carbonate, activator, dispersant and corrosion inhibitor, which has both degreasing function and anti-flammation function.

[0009] Furthermore, the rust inhibitor is composed of triethanolamine, a complexing agent, and a silane coupling agent, forming a protective film on the surface of the steel plate, which can ensure that the steel plate will not rust within 3 days.

[0010] The beneficial effects of this invention are as follows: This invention provides a coating process for transformer plate radiators. After the plate radiators are pressure-tested and welded, the interior is first rinsed with a cleaning agent, then rinsed with water and rust inhibitor, using a water pump for circulating rinsing. The plate radiators are then stood upright to drain water and dried with a hot air blower. A diaphragm pump is used to fill the inner wall paint of the plate radiators, with the bottom inlet and the top outlet. The inner wall paint is drained clean by standing the plate radiators upright and then dried with a hot air blower. The exterior of the plate radiators is shot-blasted with shot with a diameter of 0.8 mm. Since there is oil on the plate radiator surface, the shot blasting system needs to be cleaned regularly with shot blasting waste containing oxide scale to remove oil stains. The cleaning agent is used to remove oil, and the plate radiators are immersed in rust inhibitor to form a protective film to prevent rusting. Then, the plate radiators are immersed in water with a trace amount of rust inhibitor and air-dried or blown dry with hot air, which can ensure that the plate radiators will not rust for 72 hours. Finally, the plate radiators are coated with primer and topcoat. This invention relates to the welding of sheet metal parts, shot blasting of sheet metal parts, and internal degreasing and coating process for sheet metal parts. Through this coating process, the adhesion and corrosion resistance of the paint on sheet metal parts are significantly improved. Attached Figure Description

[0011] Figure 1 For existing technology flowcharts; Figure 2 This is a process flow diagram of the present invention patent; Figure 3 This is a schematic diagram of the equipment structure for step 1; Figure 4 It is a schematic structural diagram of the iron powder and dust filtering device in Step 4; Specific Embodiment

[0012] As shown in the figure, the present invention is a coating process method for transformer sheet radiators, and the process flow is: sheet radiator processing and welding - sheet radiator pressure testing and repair welding - internal cleaning agent flushing of the sheet radiator - internal hot air drying of the sheet radiator - internal filling of the inner wall paint of the sheet radiator - internal hot air drying of the sheet radiator - external shot blasting of the sheet radiator - external degreasing of the sheet radiator - immersion washing of the sheet radiator with rust inhibitor - water washing of the sheet radiator (adding a small amount of rust inhibitor) - external primer spraying of the sheet radiator - primer drying - external topcoat spraying of the sheet radiator - topcoat drying.

[0013] S1: Sheet radiator processing and welding assembly welding, using a single-piece full-automatic production line for sheet radiators to produce single pieces. As Figure 3 shown, a handling robot with a load capacity of 220 Kg and an arm span of 3100 mm automatically places it into a numerical control sheet assembling machine. This scheme includes one handling robot, two manual welding areas and a set of turnover material platforms. Before the robot starts to handle the workpieces, the protective plate in the welding area is in the lowered state. When all the required workpieces are handled, the protective plate is in the raised state. The power head at the 2nd end of the positioner moves towards the middle to clamp the radiator fins, and the operator starts welding. The robot starts to handle the required workpieces in the next welding area. When there is material in both spot welding stations, the assembly line supplies materials, and the robot grabs the workpieces and places them on the turnover material platform. There is no need to use expensive laser degreasing equipment.

[0014] Full welding of the sheet radiator, a special welding machine with 4 welding torches is used for the arc part, and a 6-axis robot plus two external axes (linear movement and rotation of the sheet radiator) is used for the linear part.

[0015] S2: Sheet radiator pressure testing and repair welding, install a pressure testing flange at the end of the oil collecting pipe of the sheet radiator, hoist the sheet radiator and place it in a clear water tank, inflate to 0.2 MPa, irradiate the weld seam with a strong flashlight, mark the leaking air bubble points with a stone pen. After completely checking all the weld seams, release the gas until the air pressure is 0 and then repair weld the marked leakage points; inflate to 0.2 MPa again to find the air bubble points for repair welding; if there are no leakage points, place it in a pressure-holding tank for pressure holding for 30 minutes, and the air pressure remains at 0.2 MPa as qualified.

[0016] S3-1: Internal cleaning agent flushing of the sheet radiator, first use a cleaning agent with a temperature of 5 - 45 °C and a pH value of 12 - 13 to flush the inside of the sheet radiator, use a water pump to circulate and flush for 5 - 7 minutes, then use clear water plus 1 - 2% cleaning and rust inhibitor to flush for 3 minutes, and then let the sheet radiator stand upright to drain water until it no longer drips; S3-2: Internal hot air drying of the sheet radiator, use a hot air blower to dry the inside of the sheet radiator after draining water, and the power of the hot air blower is 3 - 5 KW.

[0017] S3-3: The inner wall paint of the flakes is filled with a diaphragm pump. The paint is filled from the bottom and exits from the top. The paint flows out of the top opening for 5-8 seconds. Then the flakes are placed upright to drain the paint completely. Finally, the inner wall paint is dried with hot air. S4-1: External shot blasting of loose metal sheets. The oil collection pipe is sealed with a flange plate. A track-type shot blasting system is used to blast the surface of loose metal sheets. The shot diameter is 0.8mm. Since there is oil on the surface of the loose metal sheets, the oil stains of the shot blasting system need to be cleaned regularly (usually every 7-10 days) with waste containing oxide scale for several hours each time until the metal surface is bright. S4-2: External degreasing of flakes. Use a cleaning agent to soak and remove oil. Build a water tank according to the size of the flakes. It is recommended to build a 3-meter long, 2-meter wide, and 0.8-meter deep steel plate water tank with a surface height of 0.7 meters, totaling 4.2 cubic meters. The cleaning agent should account for approximately 6-8% of the volume. The pH value should be between 12 and 13. Add cleaning agent daily to maintain the pH value. Clean the water tank and completely replace the solution every 30 days.

[0018] S4-3: External rust inhibitor immersion for flakes. The water tank is constructed according to the size of the flakes. It is recommended to construct a steel plate water tank with a length of 3 meters, a width of 2 meters, a depth of 0.8 meters, and a height of 0.7 meters, for a total volume of 4.2 cubic meters. The rust inhibitor should account for about 6-8% of the volume, and the pH value should be 8-9. Immerse the flakes in the rust inhibitor for 2-3 minutes. Add the rust inhibitor daily to maintain the pH value. Clean the water tank and completely replace the solution every 30 days.

[0019] S4-4: Rinse the surface of the flakes with clean water. Construct a water tank according to the size of the flakes. It is recommended to make a steel plate water tank with a length of 3 meters, a width of 2 meters, a depth of 0.8 meters, and a height of 0.7 meters, for a total volume of 4.2 cubic meters. Add 1-2% rust inhibitor to tap water to clean the surface of the flakes, and then let them air dry, air dry, or dry at 70-80℃. Clean the water tank thoroughly and change the tank solution every 3 days.

[0020] S4-5: Iron powder and dust filtration device; filtration devices are required in all three water tanks, such as... Figure 4 As shown, the water in the pool is continuously filtered through three stages of filtration and one stage of iron powder magnetic attraction. The first stage filter cotton has a pore size of 100 microns, the second stage filter cotton has a pore size of 50 microns, and the third stage filter cotton has a pore size of 10 microns. Magnetic attraction rods are installed at the water outlet, with a gap of 2-3 mm between the two magnetic attraction rods.

[0021] S4-6: Apply paint to the exterior of the flakes, apply primer to the exterior of the flakes, 2 coats for C3 environment and 3 coats for C5 environment. Dry after each coat, then apply 1-2 coats of topcoat. After leveling, remove any drips and spray the sides of the flakes before putting them into the oven to dry.

[0022] This invention relates to a coating process for transformer finned radiators. After pressure welding and repair of the finned sections, the interior is first rinsed with a cleaning agent, then rinsed again with water and a rust inhibitor, using a water pump for circulating rinsing. The finned sections are then stood upright to drain and dried internally with a hot air blower. A diaphragm pump is used to fill the inner wall of the finned sections with paint, with the paint flowing from the bottom to the top. The finned sections are then stood upright to drain the paint completely, and the inner wall paint is dried with a hot air blower. The exterior of the finned sections is shot-blasted with 0.8mm diameter shot. Due to oil on the surface of the finned sections, the shot-blasting system needs to be periodically cleaned with waste shot containing oxide scale to remove oil stains. The finned sections are then degreased using a cleaning agent, immersed in a rust inhibitor to form a protective film to prevent rusting, and then immersed in water containing a trace amount of rust inhibitor. They are then air-dried or blown dry with hot air, ensuring they will not rust for 72 hours. Finally, the finned sections are coated with primer and topcoat. This invention relates to the processing and welding of sheet metal, shot blasting of sheet metal, internal degreasing and coating of sheet metal, and external degreasing and coating of sheet metal, which significantly improves the adhesion and corrosion resistance of sheet metal coatings.

[0023] The above-described process flow is merely a specific illustration of a feasible implementation of the present invention and is not intended to limit the scope of protection of the present invention. All equivalent implementations or modifications made without departing from the core of the present invention are included within the scope of the present invention.

Claims

1. A coating process for a transformer finned radiator, characterized in that, The process includes the following steps: sheet welding, sheet pressure repair welding, sheet internal treatment, and sheet external treatment. S1, sheet welding, uses lightly oiled cold-rolled steel plate. Oil-absorbing cotton is used to remove oil at the front end of the sheet welding production line, and a 2-meter-long handling robot is used with pneumatic clamps at the end of the sheet welding line to place the heat sink from the production line onto the sheet welding CNC assembly machine. The heat sink and oil collection pipe are manually fixed, and then a six-axis robot is used to perform full welding between the heat sink and the oil collection pipe. S2, pressure testing and welding of the loose material: Install a pressure testing flange on the end of the loose material's oil collection pipe, hoist the loose material into a clean water tank, inflate it with 0.2MPa of air, shine a strong flashlight on the weld seam, mark any leaks with a stone pencil, thoroughly check all weld seams, release the air until the pressure is 0, then weld the marked leak points; inflate again with 0.2MPa to find and weld any remaining air bubbles; if no leaks are found, place the loose material in a pressure gauge and maintain pressure for 30 minutes, maintaining a pressure of 0.2MPa is considered acceptable; S3, internal processing of flakes and bulk materials, including internal cleaning agent rinsing and degreasing of flakes and bulk materials, internal drying of flakes and bulk materials, and internal coating of the inner wall of the flakes and bulk materials. S4, external treatment of flakes, including external shot blasting of flakes, external degreasing of flakes, immersion in flake rust inhibitor, immersion in clean water and external painting of flakes, with filtration devices added to the external degreasing, immersion in flake rust inhibitor and immersion in clean water respectively. S4-1, external shot blasting of loose metal parts, with the oil collection pipe sealed with a flange plate, and a track-through shot blasting system is used to blast the surface of loose metal parts. The shot diameter is 0.8mm. Since there is oil on the surface of the loose metal parts, the shot blasting system needs to be cleaned regularly with waste containing oxide scale for several hours each time until the metal surface is bright. S4-2, external degreasing of flakes and powders, using cleaning agent to remove oil by immersion. A water tank with an area of ​​4-5 cubic meters is constructed according to the size of the flakes and powders. The cleaning agent accounts for 6-10% of the total amount. The pH value is required to be 12-13. The pH value is maintained by adding cleaning agent daily during production. The water tank is cleaned and the tank solution is replaced regularly. S4-3, rust inhibitor immersion: construct a water tank with an area of ​​4-5 cubic meters according to the size of the flakes, in which the rust inhibitor accounts for 6-10%, and the pH value is required to be 8-9. Immerse the flakes in the rust inhibitor for several minutes. Add the rust inhibitor daily to maintain the pH value. Clean the water tank and change the tank solution regularly. S4-4 is rinsed with clean water. A water tank with an area of ​​4-5 cubic meters is made according to the size of the flakes. A certain amount of rust inhibitor is added to the tap water to clean the surface of the flakes. Then, the flakes are air-dried, air-dried, or dried at 70-80℃. The water tank is cleaned and the tank solution is replaced regularly. S4-5, Iron powder and dust filtration device. Filtration devices are respectively installed in S4-2, S4-3, and S4-4. The filtration devices are filter cotton. The first-stage filter cotton has a pore size of 100 micrometers, the second-stage filter cotton has a pore size of 50 micrometers, and the third-stage filter cotton has a pore size of 10 micrometers. Magnetic suction rods are installed at the water outlet. The gap between the two magnetic suction rods is 2-3mm. After the three-stage filtration and the first-stage iron powder magnetic attraction, the water in the pool is continuously filtered. S4-6, external coating of flakes, external coating of primer, drying after each coat, then coating and drying the topcoat, removing any remaining drips, spraying the topcoat with a spray gun and then drying.

2. The coating process method for a transformer finned radiator as described in claim 1, characterized in that, The cleaning agent is composed of potassium carbonate, activator, dispersant and corrosion inhibitor, which has both degreasing function and anti-flammation function.

3. The coating process method for a transformer finned radiator as described in claim 1, characterized in that, The rust inhibitor is composed of triethanolamine, complexing agent, and silane coupling agent, which forms a protective film on the surface of the steel plate, ensuring that the steel plate will not rust within 3 days.

4. The coating process method for a transformer finned radiator as described in claim 1, characterized in that, The internal processing steps for fragmentation include: S3-1, internal cleaning agent for degreasing of flakes and powders. First, rinse the inside of the flakes and powders with a cleaning agent at 5~45℃ and pH value 12-13 using a water pump for circulating rinsing. Then, rinse with clean water and a cleaning rust inhibitor. Finally, stand the flakes and powders upright to drain until no more water drips. S3-2, Drying the inside of the flakes: After draining, the inside of the flakes is dried with a hot air blower. S3-3, the inner wall paint of the flakes is filled with a diaphragm pump, with the paint flowing out from the bottom and exiting from the top. The paint only needs to flow out for 5-8 seconds. Then the flakes are placed upright to drain the paint completely. Finally, the inner wall paint is dried with hot air.

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