Marine aluminum alloy paddle surface repairing equipment and repairing method

Abstract

The invention relates to the technical field of paddle maintenance, and discloses marine aluminum alloy paddle surface repairing equipment and a repairing method.The equipment comprises a shell, a connecting frame, a transmission shaft, a grinding wheel, an annular clamping base and other parts, a motor drives a worm, a worm gear and other transmission structures, and the grinding action combining rotation and front-back reciprocating motion of the grinding wheel is achieved. The repair method comprises the steps of pretreatment, layered gradient filling repair, controllable environment curing, surface polishing and activation, layered paint spraying and multi-dimensional performance verification. The pretreatment adopts combined operation of high-pressure air sand blowing, chemical degreasing and laser cleaning to ensure that the inner wall of the pit is clean; different modes are adopted according to the depth of the pit during filling, and the bonding strength is improved; and the efficiency and quality are improved through multi-direction movement during grinding. The corrosion pit of the paddle can be effectively repaired, the stability and durability of the repaired part are enhanced, and the service life of the paddle is prolonged.

Description

Technical Field

[0001] This invention relates to the field of propeller repair technology, specifically to a surface repair device and method for marine aluminum alloy propeller blades. Background Technology

[0002] Marine aluminum alloy propeller blades are key components of marine propulsion systems. They operate in open-air environments with salt spray, mold, and oil mist for extended periods. They are also subjected to splashing water, sand and dust, and impacts from hard objects such as sand and shells. This can lead to paint peeling, exposure of the oxide layer, and even corrosion of the aluminum alloy itself, resulting in varying degrees of corrosion pits. These pits can affect the safety and lifespan of the propeller blades, making effective repair an important issue in the field of marine maintenance.

[0003] In common marine aluminum alloy propeller surface repair techniques, the equipment used for grinding often only allows for rotation in one direction, making it difficult to perform comprehensive and uniform grinding of the propeller surface. This not only easily leads to localized repetitive work, resulting in low grinding efficiency, but also can cause inconsistent surface treatment due to uneven force, leading to stress concentration at the edges of pits, and even excessive local friction between the sanding roller and the propeller surface, affecting the repair quality. Furthermore, in terms of repair methods, the pre-treatment cleaning methods are relatively simple, failing to thoroughly remove impurities, oil, and oxide layers from corrosion pits, causing subsequent repair agents to adhere poorly. During the filling process, pits of different depths are often filled in a single step, which can easily cause air bubbles or stress concentration within the adhesive, affecting the bonding strength between the filled area and the propeller body. Summary of the Invention

[0004] To achieve the above objectives, the present invention provides the following technical solution: a surface repair device for marine aluminum alloy propeller blades, comprising:

[0005] The outer casing has a handle mounted on its outer side, a motor mounted on the left side of the inner cavity of the outer casing, and mounting plates connected to both sides of the bottom of the inner cavity of the outer casing, with worm gears inserted inside the mounting plates.

[0006] A connecting frame is installed at the top of the inner cavity of the housing. A worm gear is inserted into the inner side of the connecting frame through a bearing. A mounting block is installed at the top of the inner cavity of the housing on the side of the connecting frame.

[0007] A drive shaft is coaxially connected to the outer end of the worm gear. A swing frame is hinged to the outside of the mounting block via a bearing. A bushing is fitted on the outside of the drive shaft, and the outer end of the bushing passes through the corresponding position of the outer shell.

[0008] A grinding wheel is fitted on the outside of a bushing. A cam is coaxially connected to the front side of the worm gear. A transmission frame is fitted on the outside of the cam. The outer end of the transmission frame is connected to the outside of the swing frame through a bearing.

[0009] An annular retainer is fitted onto the outside of the bushing, and the lower inner side of the swing frame is equipped with retaining wheels, which are inserted into the annular retainer.

[0010] This invention provides a method for repairing the surface of marine aluminum alloy propeller blades, based on the aforementioned equipment for repairing the surface of marine aluminum alloy propeller blades, comprising the following steps:

[0011] S1 Preprocessing:

[0012] First, high-pressure air sandblasting is used to remove loose corrosion products and impurities from the corrosion pits on the blade surface. Then, chemical degreasing is performed on the pitted area after sandblasting. Finally, laser cleaning technology is used to scan and clean the inner wall of the pit. Through the combined operation of high-pressure air sandblasting, chemical degreasing and laser cleaning, various impurities, oil stains and oxide layers in the corrosion pit can be removed layer by layer, ensuring that the inner wall of the pit is exposed to a clean and fresh aluminum alloy substrate. This creates a solid bonding foundation for subsequent filling and repair, and effectively avoids the problem of poor adhesion of the repair agent due to incomplete surface cleaning.

[0013] S2 hierarchical gradient filling repair:

[0014] For shallow pits less than 0.5mm deep, J-349 blue adhesive is used to fill them directly to the same level as the blade surface in one go. For deep pits deeper than 0.5mm deep, J-349 blue adhesive is first filled to two-thirds of the pit depth. After curing at room temperature for 2 hours, the remaining part is filled. By adopting a layered gradient filling strategy and taking targeted treatment according to the difference in pit depth, the efficiency of shallow pit repair is ensured. In addition, by filling and curing deep pits in stages, air bubbles or stress concentration that may be caused by excessive filling of the adhesive at one time are reduced, which significantly improves the bonding strength between the filled area and the blade body.

[0015] S3 Controlled Environment Curing:

[0016] After filling in step S2, the blade is placed in a curing chamber at 20-30 degrees Celsius and cured for 8 hours. During this period, the filled area is subjected to infrared temperature measurement every 1-2 hours.

[0017] S4 Surface Polishing and Activation:

[0018] The cured blades are placed on the surface of the grinding platform. Then the motor is started to drive the worm gear to rotate, which in turn drives the transmission frame and the swing frame to move with the help of the worm wheel. After the grinding wheel contacts the grinding point on the blade surface, the filling area is ground by high-speed rotation and forward and backward and left and right movements. Then the ground area is subjected to plasma surface activation treatment.

[0019] S5 layered paint:

[0020] First, spray a layer of epoxy primer on the blade surface. After the primer dries, use putty to repair the tiny air bubbles and pinholes that were not painted. After sanding it smooth, spray polyurethane topcoat.

[0021] S6 Multi-Dimensional Performance Verification:

[0022] The adhesion of the laser-repaired blades was tested using the cross-cut test, followed by salt spray test, water erosion impact test, and sand and gravel impact test.

[0023] Preferably, a wire hole is provided at the bottom of the housing corresponding to the position of the motor. The outer end of the motor rotor is coaxially connected to the outside of the worm. The worm meshes with the worm wheel. The wire hole facilitates the reasonable arrangement of the motor wiring and avoids messy wiring affecting the operation of the equipment. The coaxial connection between the motor and the worm and the meshing between the worm and the worm wheel ensure the stability and efficiency of power transmission, ensuring that the grinding wheel can stably perform the grinding action.

[0024] Preferably, the cam passes through the corresponding position of the connecting frame, and a limiting plate is installed at the outer end of the cam. The diameter of the limiting plate is larger than the diameter of the cam, and the thickness of the cam is the same as the thickness of the transmission frame. The limiting plate can effectively limit the axial displacement of the transmission frame, prevent it from detaching from the cam, and ensure the stability of the transmission process. The cam thickness is the same as the transmission frame thickness, so that the two are in full contact, the transmission is smoother, and the accuracy of the grinding action is improved.

[0025] Preferably, both outer sides of the drive shaft are provided with protrusions, and the inner sides of the bushing are provided with limit grooves corresponding to the protrusions. The cooperation between the protrusions and the limit grooves can limit the relative rotation between the drive shaft and the bushing, ensure that the power is efficiently transmitted to the grinding wheel, and prevent the bushing from slipping, thus ensuring the continuity and reliability of the grinding process.

[0026] Preferably, the chemical degreasing treatment in step S1 uses a neutral and environmentally friendly degreasing agent. During the treatment, the blade pit area is completely immersed in the degreasing agent, while ultrasonic vibration is used. After the ultrasonic treatment, compressed air is used to blow away any residual degreasing agent in the pit. Simultaneously, the laser cleaning technology uses a spiral scanning path, that is, it gradually advances from the edge of the pit to the center. During the laser cleaning process, the laser output power is adjusted by monitoring the intensity of reflected light in real time. After the cleaning is completed, strong light is used to check whether there are any uncleaned local areas on the inner wall of the pit. If so, the area is scanned and cleaned a second time. The neutral and environmentally friendly degreasing agent combined with ultrasonic vibration can more thoroughly remove oil stains and is environmentally friendly and harmless. Compressed air drying avoids residues that may affect subsequent treatment. The spiral scanning path and real-time power adjustment ensure that the laser cleaning is thorough and does not damage the substrate. The secondary inspection further guarantees the cleaning effect and provides a better surface foundation for filling and repair.

[0027] Preferably, in step S2, before using J-349 blue adhesive, the adhesive is first placed at room temperature to allow the internal air bubbles to rise and dissipate naturally. Then, a stirring tool is used to stir the adhesive to ensure that the adhesive components are evenly mixed. When filling deep pits for the first time, a flat applicator is used to evenly apply the adhesive to the inner wall of the pit. When filling for the second time, the adhesive surface is made higher than the blade body surface. Allowing the adhesive to stand to remove air bubbles and stirring ensure that the adhesive is free of air bubbles and has a uniform composition, thus improving the bonding quality. Applying the adhesive with a flat tool makes it adhere more tightly to the inner wall of the pit. The second filling leaves an allowance for subsequent polishing, ensuring the flatness of the filled area and the blade surface.

[0028] Preferably, in step S3, when performing infrared temperature measurement, a multi-point measurement method is adopted, that is, temperature measurement points are set at the center, edge and joint of the filling area with the blade body, and the temperature value of each point is recorded after each measurement. If a temperature difference is found between a certain point and the surrounding area, the temperature circulation system in the curing chamber is adjusted synchronously to make the temperature of each part of the filling area consistent. Multi-point temperature measurement can comprehensively grasp the curing temperature distribution of the filling area, and timely adjustment can ensure that the temperature of each part is uniform, avoid poor curing effect due to local temperature abnormalities, and enhance the overall strength and stability of the repair agent after curing.

[0029] Preferably, in step S4, the plasma surface activation treatment uses a mixture of inert gas and a small amount of active gas as the working gas. During the treatment, the plasma spray gun is kept at a distance from the polishing area. At the same time, the surface color change is observed in real time during the activation process to judge the activation effect. Using a mixed gas as the working gas can enhance the activation effect. Setting a reasonable distance avoids surface damage. Real-time observation of color changes can accurately control the degree of activation, ensure that the surface activity is moderate, and improve the adhesion of subsequent coatings.

[0030] Compared with the prior art, the present invention provides a surface repair device and method for marine aluminum alloy propeller blades, which has the following beneficial effects:

[0031] 1. The surface repair equipment and method for marine aluminum alloy propeller blades utilizes a motor to drive the rotation of a worm gear, which in turn drives the rotation of a cam. This synchronously drives the movement of the transmission frame and the swing frame, causing the bushing and grinding wheel to reciprocate while rotating. This continuous cutting and grinding of the propeller blade surface, combined with the reciprocating motion, expands the grinding coverage, allowing the grinding wheel to work on more areas per unit time. This avoids localized repetitive work that occurs with grinding in a single direction, significantly improving the overall grinding speed. It also avoids uneven surface treatment caused by unidirectional movement, eliminates stress concentration at the edges of corrosion pits on the propeller blade surface, reduces excessive localized friction between the grinding wheel and the propeller blade surface, and improves the quality of propeller blade repair.

[0032] 2. The surface repair equipment and method for marine aluminum alloy propeller blades utilizes a combination of high-pressure air sandblasting, chemical degreasing, and laser cleaning during the pretreatment stage. This process thoroughly removes various impurities, oil stains, and oxide layers from corrosion pits, ensuring that the inner walls of the pits are exposed to a clean and fresh aluminum alloy substrate. This creates a solid bonding foundation for subsequent filling and repair, effectively avoiding the problem of poor adhesion of the repair agent due to incomplete surface cleaning. Furthermore, the layered gradient filling strategy employs targeted treatment methods based on the pit depth differences. This ensures high efficiency in repairing shallow pits while reducing air bubbles or stress concentration that may occur when the adhesive is filled too thickly at once by filling and curing deep pits in stages. This significantly improves the bonding strength between the filled area and the propeller blade body. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the structure of the present invention;

[0034] Figure 2 This is a schematic cross-sectional view of the outer casing of the present invention;

[0035] Figure 3 This is a schematic diagram of the transmission shaft structure of the present invention;

[0036] Figure 4 This is a schematic diagram of the assembly of the cam and transmission frame structure of the present invention;

[0037] Figure 5 This is a schematic diagram of the swing frame and bushing structure of the present invention;

[0038] Figure 6 This is a schematic diagram of the card-mounted wheel structure of the present invention;

[0039] Figure 7 This is a schematic diagram of the cross-sectional structure of the bushing of the present invention;

[0040] Figure 8 This is a flowchart of the repair method of the present invention.

[0041] In the diagram: 1. Outer shell; 2. Handle; 3. Motor; 4. Assembly plate; 5. Worm gear; 6. Connecting frame; 7. Worm wheel; 8. Mounting block; 9. Drive shaft; 10. Cam; 11. Limiting plate; 12. Transmission frame; 13. Swing frame; 14. Bushing; 15. Grinding wheel; 16. Snap-fit ​​wheel; 17. Annular seat; 18. Protrusion; 19. Limiting groove. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] This invention provides a technical solution: a surface repair device for marine aluminum alloy propeller blades, comprising a housing 1, a handle 2, a motor 3, an assembly plate 4, a worm gear 5, a connecting frame 6, a worm wheel 7, a mounting block 8, a drive shaft 9, a cam 10, a limiting plate 11, a transmission frame 12, a swing frame 13, a bushing 14, a grinding wheel 15, a clamping wheel 16, an annular clamping seat 17, a protrusion 18, and a limiting groove 19.

[0044] Please see Figure 1 A handle 2 is mounted on the outer side of the outer casing 1. Please refer to [link / reference]. Figure 2 A motor 3 is installed on the left side of the inner cavity of the outer shell 1, and an assembly plate 4 is connected to both sides of the bottom of the inner cavity of the outer shell 1. A worm gear 5 is inserted into the inside of the assembly plate 4.

[0045] A connecting frame 6 is installed on the top of the inner cavity of the housing 1. A worm gear 7 is inserted into the inner side of the connecting frame 6 through a bearing. An mounting block 8 is installed on the top of the inner cavity of the housing 1 at the side of the connecting frame 6. A wire hole is opened at the bottom of the housing 1 at the position corresponding to the motor 3. The outer end of the rotor of the motor 3 is coaxially connected to the outside of the worm 5. The worm 5 meshes with the worm gear 7.

[0046] Please see Figure 3 The drive shaft 9 is coaxially connected to the outer end of the worm gear 5. Please refer to [link / reference]. Figure 5 A swing frame 13 is hinged to the outside of the mounting block 8 via a bearing, and a bushing 14 is sleeved on the outside of the drive shaft 9, with the outer end of the bushing 14 penetrating through the corresponding position of the outer shell 1.

[0047] Grinding wheel 15 is fitted outside of bushing 14. Please refer to [link / reference]. Figure 4 A cam 10 is coaxially connected to the front side of the worm gear 7, and a transmission frame 12 is sleeved on the outside of the cam 10. Please refer to [link / reference]. Figure 3 The outer end of the transmission frame 12 is connected to the outside of the swing frame 13 through a bearing. The cam 10 passes through the corresponding position of the connecting frame 6. The outer end of the cam 10 is equipped with a limiting plate 11. The diameter of the limiting plate 11 is larger than the diameter of the cam 10. The thickness of the cam 10 is the same as the thickness of the transmission frame 12.

[0048] Please see Figure 6 and Figure 7 The annular retainer 17 is sleeved on the outside of the bushing 14. The lower inner side of the swing frame 13 is equipped with a retaining wheel 16, which is inserted into the inside of the annular retainer 17. The outer sides of the drive shaft 9 are equipped with protrusions 18, and the inner sides of the bushing 14 are provided with limit grooves 19 corresponding to the protrusions 18.

[0049] Please see Figure 8 This invention provides a method for repairing the surface of marine aluminum alloy propeller blades, based on the aforementioned equipment for repairing the surface of marine aluminum alloy propeller blades, comprising the following steps:

[0050] S1 Preprocessing:

[0051] First, high-pressure air is used to blow sand to remove loose corrosion products and impurities from the corrosion pits on the blade surface. Then, the pitted area after sand blowing is chemically degreased. Finally, laser cleaning technology is used to scan and clean the inner wall of the pit.

[0052] Chemical degreasing uses a neutral and environmentally friendly degreasing agent. During the process, the blade pit area is completely immersed in the degreasing agent, and ultrasonic vibration is used in conjunction with it. After the ultrasonic treatment, compressed air is used to blow away the residual degreasing agent in the pit. Meanwhile, the laser cleaning technology uses a spiral scanning path, that is, it gradually advances from the edge of the pit to the center. During the laser cleaning process, the laser output power is adjusted by monitoring the intensity of reflected light in real time. After the cleaning is completed, strong light is used to check whether there are any uncleaned local areas on the inner wall of the pit. If so, the area is scanned and cleaned a second time.

[0053] S2 hierarchical gradient filling repair:

[0054] For shallow pits less than 0.5mm deep, J-349 blue adhesive is used to fill them directly until they are flush with the blade surface. For deep pits greater than 0.5mm deep, J-349 blue adhesive is first filled to two-thirds of the pit depth, and after curing at room temperature for 2 hours, the remaining part is filled.

[0055] Before using J-349 blue adhesive, let the adhesive stand at room temperature until the air bubbles inside rise to the surface and are eliminated. Then, use a stirring tool to stir the adhesive to ensure that the components are mixed evenly. When filling deep pits for the first time, use a flat applicator to apply the adhesive evenly to the inner wall of the pit. When filling for the second time, make sure that the adhesive surface is higher than the blade body surface.

[0056] S3 Controlled Environment Curing:

[0057] After filling in step S2, the blade is placed in a curing chamber at 20-30 degrees Celsius and cured for 8 hours. During this period, the filled area is subjected to infrared temperature measurement every 1-2 hours.

[0058] When performing infrared temperature measurement, a multi-point measurement method is adopted, that is, temperature measurement points are set at the center, edge and junction of the filling area and the blade body. The temperature value of each point is recorded after each measurement. If a temperature difference is found between a certain point and the surrounding area, the temperature circulation system in the curing chamber is adjusted synchronously to keep the temperature of each part of the filling area consistent.

[0059] S4 Surface Polishing and Activation:

[0060] The cured blades are placed on the surface of the grinding platform. Then, the motor 3 is started to drive the worm gear 5 to rotate, which in turn drives the transmission frame 12 and the swing frame 13 to move with the help of the worm wheel 7. Then, after the grinding wheel 15 contacts the grinding point on the blade surface, the filling area is ground by high-speed rotation and forward and backward and left and right movements. Then, the ground area is subjected to plasma surface activation treatment.

[0061] The plasma surface activation treatment uses a mixture of inert gas and a small amount of active gas as the working gas. During the treatment, the plasma spray gun is kept at a distance from the grinding area. At the same time, the surface color change is observed in real time during the activation process to judge the activation effect.

[0062] S5 layered paint:

[0063] First, spray a layer of epoxy primer on the blade surface. After the primer dries, use putty to repair the tiny air bubbles and pinholes that were not painted. After sanding it smooth, spray polyurethane topcoat.

[0064] S6 Multi-Dimensional Performance Verification:

[0065] The adhesion of the laser-repaired blades was tested using the cross-cut test, followed by salt spray test, water erosion impact test and sand and gravel impact test.

[0066] During multi-dimensional performance verification, after the salt spray test, in addition to checking whether corrosion occurs in the filled area, it is also necessary to observe the bonding state between the primer and the topcoat, and check whether there is any blistering or peeling of the coating. When conducting the water erosion impact test, the water flow angle is simulated to make the water flow obliquely impact the filled area and the surrounding transition parts.

[0067] This solution uses motor 3 to drive the rotation of worm gear 5, which in turn drives cam 10 through worm wheel 7. This synchronously drives the movement of transmission frame 12 and swing frame 13, causing bushing 14 and grinding wheel 15 to reciprocate while rotating. This continuous cutting and grinding of the blade surface, along with the reciprocating motion, expands the grinding coverage, allowing grinding wheel 15 to work on more areas per unit time. This avoids localized repetitive work that occurs with grinding in a single direction, significantly improving the overall grinding speed. It also avoids uneven surface treatment caused by unidirectional movement, eliminates stress concentration at the edges of corrosion pits on the blade surface, reduces excessive localized friction between grinding wheel 15 and blade surface, and improves the quality of blade repair.

[0068] This solution utilizes a combination of high-pressure air sandblasting, chemical degreasing, and laser cleaning during the pretreatment stage to thoroughly remove various impurities, oil stains, and oxide layers from corrosion pits layer by layer. This ensures that the inner walls of the pits are exposed to clean and fresh aluminum alloy substrate, creating a solid bonding foundation for subsequent filling and repair. This effectively avoids the problem of poor adhesion of the repair agent due to incomplete surface cleaning. At the same time, the layered gradient filling strategy adopts targeted treatment methods according to the differences in pit depth. This ensures the high efficiency of shallow pit repair and reduces the possibility of air bubbles or stress concentration in the adhesive due to excessive thickness of the filler in one go by filling and curing the deep pits in stages. This significantly improves the bonding strength between the filled area and the blade body.

[0069] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0070] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A surface repair device for marine aluminum alloy propeller blades, characterized in that, include: The outer shell (1) has a handle (2) installed on its outer side, a motor (3) installed on the left side of the inner cavity of the outer shell (1), and mounting plates (4) connected to both sides of the bottom of the inner cavity of the outer shell (1). A worm gear (5) is inserted into the inside of the mounting plate (4). A connecting frame (6) is installed on the top of the inner cavity of the outer shell (1). A worm gear (7) is inserted into the inner side of the connecting frame (6) through a bearing. An mounting block (8) is installed on the top of the inner cavity of the outer shell (1) at the side of the connecting frame (6). The drive shaft (9) is coaxially connected to the outer end of the worm (5). The outside of the mounting block (8) is hinged to a swing frame (13) through a bearing. The drive shaft (9) is fitted with a bushing (14), and the outer end of the bushing (14) passes through the corresponding position of the outer shell (1). A grinding wheel (15) is fitted on the outside of a bushing (14). A cam (10) is coaxially connected to the front side of the worm gear (7). A transmission frame (12) is fitted on the outside of the cam (10). The outer end of the transmission frame (12) is connected to the outside of the swing frame (13) through a bearing. An annular retainer (17) is sleeved on the outside of the bushing (14). The lower inner side of the swing frame (13) is equipped with a retaining wheel (16), which is inserted into the annular retainer (17).

2. The marine aluminum alloy propeller surface repair equipment according to claim 1, characterized in that: The bottom of the outer casing (1) is provided with a wire hole corresponding to the position of the motor (3). The outer end of the rotor of the motor (3) is coaxially connected to the outside of the worm (5). The worm (5) meshes with the worm wheel (7).

3. The marine aluminum alloy propeller surface repair equipment according to claim 1, characterized in that: The cam (10) passes through the corresponding position of the connecting frame (6). The outer end of the cam (10) is equipped with a limiting plate (11). The diameter of the limiting plate (11) is larger than the diameter of the cam (10). The thickness of the cam (10) is the same as the thickness of the transmission frame (12).

4. The marine aluminum alloy propeller surface repair equipment according to claim 1, characterized in that: The transmission shaft (9) is provided with protrusions (18) on both outer sides, and the bushing (14) is provided with limit grooves (19) on both inner sides corresponding to the protrusions (18).

5. A method for repairing the surface of marine aluminum alloy propeller blades, based on the surface repair equipment for marine aluminum alloy propeller blades according to any one of claims 1-4, characterized in that, Includes the following steps: S1 Preprocessing: First, high-pressure air is used to blow sand to remove loose corrosion products and impurities from the corrosion pits on the blade surface. Then, the pitted area after sand blowing is chemically degreased. Finally, laser cleaning technology is used to scan and clean the inner wall of the pit. S2 hierarchical gradient filling repair: For shallow pits less than 0.5mm deep, J-349 blue adhesive is used to fill them directly until they are flush with the blade surface. For deep pits greater than 0.5mm deep, J-349 blue adhesive is first filled to two-thirds of the pit depth, and after curing at room temperature for 2 hours, the remaining part is filled. S3 Controlled Environment Curing: After filling in step S2, the blade is placed in a curing chamber at 20-30 degrees Celsius and cured for 8 hours. During this period, the filled area is subjected to infrared temperature measurement every 1-2 hours. S4 Surface Polishing and Activation: The cured blades are placed on the surface of the grinding platform. Then the motor (3) is started to drive the worm (5) to rotate. With the cooperation of the worm wheel (7), the transmission frame (12) and the swing frame (13) can be driven to move. Then, after the grinding wheel (15) contacts the grinding point on the blade surface, the filling area is ground by high-speed rotation and forward and backward movement. Then the ground area is subjected to plasma surface activation treatment. S5 layered paint: First, spray a layer of epoxy primer on the blade surface. After the primer dries, use putty to repair the tiny air bubbles and pinholes that were not painted. After sanding it smooth, spray polyurethane topcoat. S6 Multi-Dimensional Performance Verification: The adhesion of the laser-repaired blades was tested using the cross-cut test, followed by salt spray test, water erosion impact test, and sand and gravel impact test.

6. A method for repairing the surface of a marine aluminum alloy propeller blade according to claim 5, characterized in that: The chemical degreasing treatment in step S1 uses a neutral and environmentally friendly degreasing agent. During the treatment, the blade pit area is completely immersed in the degreasing agent, and ultrasonic vibration is used in conjunction. After the ultrasonic treatment, compressed air is used to blow away the residual degreasing agent in the pit. At the same time, the laser cleaning technology adopts a spiral scanning path, that is, it gradually advances from the edge of the pit to the center. During the laser cleaning process, the laser output power is adjusted by monitoring the intensity of reflected light in real time. After the cleaning is completed, strong light is used to check whether there are any uncleaned local areas on the inner wall of the pit. If so, the area is scanned and cleaned a second time.

7. A method for repairing the surface of a marine aluminum alloy propeller blade according to claim 5, characterized in that: In step S2, before using J-349 blue adhesive, the adhesive is placed at room temperature and allowed to stand until the air bubbles inside rise and are eliminated. Then, a stirring tool is used to stir the adhesive components to ensure they are evenly mixed. When filling the deep pit for the first time, a flat applicator is used to apply the adhesive evenly to the inner wall of the pit. When filling for the second time, the adhesive surface is made to be higher than the blade body surface.

8. A method for repairing the surface of a marine aluminum alloy propeller blade according to claim 5, characterized in that: In step S3, when performing infrared temperature measurement, a multi-point measurement method is adopted, that is, temperature measurement points are set at the center, edge and junction of the filling area with the blade body. After each temperature measurement, the temperature value of each point is recorded. If a temperature difference is found between a certain point and the surrounding area, the temperature circulation system in the curing chamber is adjusted synchronously to keep the temperature of each part of the filling area consistent.

9. A method for repairing the surface of a marine aluminum alloy propeller blade according to claim 5, characterized in that: The plasma surface activation treatment in step S4 uses a mixture of inert gas and a small amount of active gas as the working gas. During the treatment, the plasma spray gun is kept at a distance from the polishing area. At the same time, the surface color change is observed in real time during the activation process to judge the activation effect.

10. A method for repairing the surface of a marine aluminum alloy propeller blade according to claim 5, characterized in that: In step S6, during the multi-dimensional performance verification, after the salt spray test, in addition to checking whether corrosion occurs in the filled area, it is also necessary to observe the bonding state between the primer and the topcoat, and check whether there is any coating blistering or peeling. When conducting the water erosion impact test, the water flow angle is simulated to make the water flow obliquely impact the filled area and the surrounding transition parts.

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