Chromium-free passivation treatment device for aluminum alloy

Abstract

The invention discloses an aluminum alloy chromate-free passivation treatment device, and relates to the technical field of passivation treatment, the aluminum alloy chromate-free passivation treatment device comprises a cleaning box and a treatment box, the cleaning box and the treatment box are fixedly connected, and the cleaning box is provided with a multi-dimensional cleaning assembly; the multi-dimensional cleaning assembly comprises a driving pump installed on the inner side of the cleaning box, a first gear rotationally connected with the inner side of the cleaning box, an annular spray head arranged on the inner side of the first gear in a sliding mode, a plurality of hemispherical blocks installed on the inner side of the cleaning box and a movable ball installed at the bottom of the annular spray head, and the driving pump is started to enable the annular spray head to spray; according to the multi-dimensional cleaning device, the annular spray head rotates back and forth around the outer side of the workpiece for spraying through the multi-dimensional cleaning assembly, the annular spray head moves up and down for spraying while rotating back and forth, the surface of the workpiece can be covered more comprehensively through the multi-dimensional spraying mode, and the cleaning efficiency is improved; cleaning dead angles are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of passivation treatment, in particular to a chromium-free passivation treatment device for aluminum alloys. Background Art

[0002] The chromium-free passivation treatment device for aluminum alloys is a device used to perform chromium-free passivation treatment on aluminum alloy workpieces. The traditional chromate passivation process used for passivation of aluminum alloy workpieces contains harmful elements such as hexavalent chromium, posing a threat to the environment and human health. Chromium-free passivation is an environmentally friendly, safe, and efficient surface treatment method that forms a chemical conversion film on the aluminum alloy surface, enhancing the workpiece's corrosion resistance. Chromium-free passivation, because it completely contains no chromium ions or any other harmful substances such as heavy metals, meets modern environmental standards. The passivation film formed after chromium-free passivation has the advantages of being dense, fine, uniform, and resistant to salt spray for a long time. It also has good adhesion to metal coatings and has a wide range of applications.

[0003] When passivating aluminum alloy workpieces, the workpieces need to be cleaned. Traditional chromium-free passivation treatment devices usually have a single spraying function, which makes it difficult to achieve multi-dimensional spraying when cleaning workpieces. When the workpieces are complex in shape, a single spraying method is prone to problems such as blind spots that cannot be cleaned, and the accuracy of workpiece cleaning is low. Different workpieces have different degrees of contamination and sizes. Traditional devices often cannot automatically adjust the spraying pressure and spraying range according to the degree of contamination of the workpieces. They usually use fixed spraying parameters and cannot accurately clean workpieces of different contamination levels and sizes. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the present invention provides a chromium-free passivation treatment device for aluminum alloy, which can fully cover the surface of the workpiece and perform efficient cleaning.

[0005] The technical solution adopted by the present invention to solve the above technical problems is: The chromium-free passivation treatment device for aluminum alloy comprises a cleaning box and a treatment box, wherein the cleaning box and the treatment box are fixedly connected, and a multi-dimensional cleaning component is provided on the cleaning box, and the multi-dimensional cleaning component comprises a driving pump installed inside the cleaning box, a first gear rotatably connected inside the cleaning box, an annular nozzle slidingly arranged inside the first gear, a plurality of hemispherical blocks installed inside the cleaning box, and a movable ball installed at the bottom of the annular nozzle, wherein the driving pump is started to cause the annular nozzle to spray, and the first gear drives the annular nozzle to rotate back and forth to spray, and the movable ball squeezes the hemispherical block to drive the annular nozzle to move up and down for spraying. This multi-dimensional spraying method can more comprehensively cover the surface of the workpiece, improve the cleaning efficiency, and reduce the cleaning dead angle. A servo motor is installed at the bottom of the annular nozzle, and a threaded rod is installed at the output end of the servo motor. A circular plate is slidably arranged on the inner side of the annular nozzle, and the threaded rod is threadedly connected to the circular plate to achieve adaptive and precise cleaning of workpieces of different sizes. A control system is provided on the cleaning box, and the control system comprises: A contamination degree detection module is used to obtain contamination degree data on the workpiece surface in real time through an optical sensor; A data processing and analysis module is used to analyze the pollution level data obtained by the pollution level detection module through a convolutional neural network, and select the spraying pressure required to drive the pump through a preset spraying strategy library; The pressure regulating module is used to adjust the spraying pressure of the driving pump in real time according to the selection results of the data processing and analysis module.

[0006] The above technical solution further includes: A first servo motor is installed inside the cleaning box, and a second gear is installed at the output end of the first servo motor. The second gear is meshed with the first gear, and the first servo motor can drive the first gear to rotate back and forth through the second gear.

[0007] A sliding groove is symmetrically provided on the outer side of the annular nozzle, a sliding block is slidingly provided inside the sliding groove, the sliding block is fixedly connected to the first gear, a spring is installed at the bottom of the sliding block, and the end of the spring away from the sliding block is fixedly connected to the inner wall of the sliding groove, and the first gear and the annular nozzle move upward along the sliding groove through the sliding block.

[0008] A first support plate is installed at the bottom of the annular nozzle, the movable ball is installed on the side of the first support plate away from the annular nozzle, an arc plate is installed on the inner side of the cleaning box, and the hemispherical blocks are installed on the upper part of the arc plate. The number of the hemispherical blocks is multiple groups and is evenly distributed in a circle. The hemispherical blocks are above the movement trajectory of the movable ball, and the movable ball squeezes the hemispherical blocks when it moves.

[0009] An annular groove is provided on the inner side of the annular nozzle, and the circular plate is slidably arranged on the inner side of the annular groove. A second support plate is installed at the bottom of the annular nozzle, and the servo motor is installed on the outer side of the second support plate. Guide plates are symmetrically installed on the outer side of the second support plate. Both guide plates are slidably connected to the circular plate. The circular plate is supported by the guide plate and moves upward to block part of the nozzle of the annular nozzle.

[0010] The size of the annular groove opening is adapted to the size of the circular plate, and the circular plate fits tightly against the inner wall of the annular groove.

[0011] A support rail is installed on the upper part of the cleaning box, a moving device is slidably provided on the outer side of the support rail, a cylinder is installed on the bottom of the moving device, and a clamping device is installed on the end of the cylinder away from the moving device for adjusting the position of the workpiece.

[0012] The data processing and analysis module includes a data receiving unit, a data analysis unit and a control signal generating unit. The data receiving unit receives the pollution level data from the pollution level detection module. The data analysis unit analyzes the pollution level data, classifies and identifies the pollution level data through a convolutional neural network, and selects the required spraying pressure through a preset spraying strategy library. The control signal generating unit generates a control signal based on the analysis result of the data analysis unit and sends it to the pressure regulation module.

[0013] The analysis process of the data analysis unit is as follows: Feature extraction: Based on the image data of pollution degree data, color, texture and shape features are selected and meaningful features are extracted through SIFT feature extraction method; Classification identification: The convolutional neural network model is trained using the preprocessed data and extracted features. During the training process, the model parameters are adjusted by the backpropagation algorithm to minimize the loss function. The model is verified using the validation set data and the hyperparameters are adjusted to avoid overfitting. The backpropagation algorithm calculates the gradient of the loss function with respect to the model parameters by the chain rule. ,in, Is a vector containing the loss function For all parameters The partial derivative of Classification recognition execution: New pollution level data is input into the trained convolutional neural network model. The convolutional neural network model automatically classifies and identifies the pollution level based on the characteristics of the input data and outputs classification results, such as light pollution, moderate pollution, and heavy pollution. Spraying pressure selection: In combination with a preset spraying strategy library, a spraying strategy is selected according to the classification recognition result, wherein the spraying strategy library corresponds to light pollution, moderate pollution and heavy pollution with light pressure, moderate pressure and heavy pressure respectively.

[0014] The pressure regulating module includes a pressure regulating device unit and a signal receiving and executing unit. The pressure regulating device unit includes a pressure regulating valve. The signal receiving and executing unit receives the control signal of the data processing and analysis module and drives the pressure regulating valve to adjust the spraying pressure of the driving pump.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, the annular nozzle rotates back and forth around the outside of the workpiece and sprays through a multi-dimensional cleaning component. The annular nozzle moves up and down while rotating back and forth to spray. This multi-dimensional spraying method can cover the surface of the workpiece more comprehensively, improve cleaning efficiency, and reduce cleaning dead angles.

[0016] 2. The present invention adjusts the position of the circular plate so that the upper and lower widths of the usable nozzle of the annular nozzle are equal to the size of the workpiece, thereby realizing adaptive and precise cleaning of workpieces of different sizes. The pollution degree data is analyzed and identified by the data processing and analysis module, and the pollution degree of the workpiece is divided into three categories: light pollution, moderate pollution and heavy pollution. According to the pollution degree of the workpiece, the pressure regulation module adjusts the spraying pressure of the driving pump to realize precise spraying according to the pollution degree. This precise spraying pressure adjustment can ensure that workpieces with different pollution degrees are properly cleaned, and neither insufficient cleaning nor excessive cleaning will be caused. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the overall structure of the chromium-free passivation treatment device for aluminum alloys of the present invention; Figure 2 This is a schematic diagram of the front cross-sectional structure of the cleaning box of the present invention; Figure 3 It is a schematic diagram of the rear cross-sectional structure of the cleaning box in the present invention; Figure 4 Schematic diagram of the control system in the present invention; Figure 5 for Figure 2 A schematic diagram of the structure at center A; Figure 6 for Figure 2 A magnified schematic diagram of the structure at point B in the middle; Figure 7 for Figure 3 A magnified schematic diagram of the structure at point C in the middle; Figure 8 for Figure 3 Enlarged schematic diagram of the structure at point D in the middle.

[0018] In the figure: 1. Cleaning box; 2. Processing box; 3. Support rail; 4. Moving device; 5. Cylinder; 6. Clamping device; 7. First gear; 8. Annular nozzle; 9. Sliding groove; 10. Spring; 11. Sliding block; 12. First servo motor; 13. Second gear; 14. First support plate; 15. Movable ball; 16. Arc plate; 17. Hemispherical block; 18. Annular groove; 19. Circular plate; 20. Second support plate; 21. Servo motor; 22. Threaded rod; 23. Guide plate; 24. Contamination degree detection module; 25. Data processing and analysis module; 26. Pressure regulation module; 27. Drive pump; 28. Control module; 29. ​​Connecting pipe. DETAILED DESCRIPTION

[0019] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and specific embodiments.

[0020] like Figure 1 - Figure 8 As shown, the chromium-free passivation treatment device for aluminum alloy proposed by the present invention includes a cleaning box 1 and a treatment box 2, the cleaning box 1 and the treatment box 2 are fixedly connected, and a multi-dimensional cleaning component is provided on the cleaning box 1, and the multi-dimensional cleaning component includes a driving pump 27 installed inside the cleaning box 1, a first gear 7 rotatably connected inside the cleaning box 1, an annular nozzle 8 slidingly arranged inside the first gear 7, a plurality of hemispherical blocks 17 installed inside the cleaning box 1, and a movable ball 15 installed at the bottom of the annular nozzle 8. The driving pump 27 is started to make the annular nozzle 8 spray, and the first gear 7 drives the annular nozzle 8 to spray. The nozzle 8 rotates back and forth to spray, and the movable ball 15 squeezes the hemispherical block 17 to drive the annular nozzle 8 to move up and down for spraying. This multi-dimensional spraying method can more comprehensively cover the surface of the workpiece, improve cleaning efficiency, and reduce cleaning dead angles. A servo motor 21 is installed at the bottom of the annular nozzle 8, and a threaded rod 22 is installed at the output end of the servo motor 21. A circular plate 19 is slidingly provided on the inner side of the annular nozzle 8. The threaded rod 22 is threadedly connected to the circular plate 19, thereby achieving adaptive and precise cleaning of workpieces of different sizes. A control system is provided on the cleaning box 1, and the control system includes: The contamination level detection module 24 is used to obtain the contamination level data of the workpiece surface in real time through an optical sensor; The data processing and analysis module 25 is used to analyze the pollution level data obtained by the pollution level detection module 24 through a convolutional neural network, and select the spraying pressure required by the driving pump 27 through a preset spraying strategy library; The pressure regulating module 26 is used to adjust the spraying pressure of the driving pump 27 in real time according to the selection result of the data processing and analysis module 25 .

[0021] A first servo motor 12 is installed inside the cleaning box 1. A second gear 13 is installed at the output end of the first servo motor 12. The second gear 13 is meshed with the first gear 7. The first servo motor 12 can drive the first gear 7 to rotate back and forth through the second gear 13.

[0022] A sliding groove 9 is symmetrically provided on the outside of the annular nozzle 8, and a sliding block 11 is slidingly provided inside the sliding groove 9. The sliding block 11 is fixedly connected to the first gear 7. A spring 10 is installed at the bottom of the sliding block 11. The end of the spring 10 away from the sliding block 11 is fixedly connected to the inner wall of the sliding groove 9. The first gear 7 and the annular nozzle 8 move upward along the sliding groove 9 through the sliding block 11.

[0023] A first support plate 14 is installed at the bottom of the annular nozzle 8, and a movable ball 15 is installed on the side of the first support plate 14 away from the annular nozzle 8. An arc plate 16 is installed on the inner side of the cleaning box 1, and a hemispherical block 17 is installed on the upper part of the arc plate 16. The number of hemispherical blocks 17 is multiple groups and is evenly distributed around the circumference. The hemispherical blocks 17 are above the movement trajectory of the movable ball 15, and the movable ball 15 squeezes the hemispherical blocks 17 when it moves.

[0024] A support rail 3 is installed on the upper part of the cleaning box 1, and a moving device 4 is slidingly set on the outer side of the support rail 3. A cylinder 5 is installed at the bottom of the moving device 4, and a clamping device 6 is installed at the end of the cylinder 5 away from the moving device 4 for adjusting the position of the workpiece.

[0025] An annular groove 18 is provided on the inner side of the annular nozzle 8, and a circular plate 19 is slidably arranged on the inner side of the annular groove 18. A second support plate 20 is installed at the bottom of the annular nozzle 8, and a servo motor 21 is installed on the outer side of the second support plate 20. Guide plates 23 are symmetrically installed on the outer side of the second support plate 20. Both guide plates 23 are slidably connected to the circular plate 19. The circular plate 19 is supported by the guide plate 23 to move upward to block part of the nozzle of the annular nozzle 8.

[0026] The size of the opening of the annular groove 18 is adapted to the size of the circular plate 19 , and the circular plate 19 fits tightly against the inner wall of the annular groove 18 .

[0027] The data processing and analysis module 25 includes a data receiving unit, a data analysis unit and a control signal generating unit. The data receiving unit receives the pollution level data from the pollution level detection module 24. The data analysis unit analyzes the pollution level data, classifies and identifies the pollution level data through a convolutional neural network, and selects the spraying pressure to be adopted through a preset spraying strategy library. The control signal generating unit generates a control signal according to the analysis result of the data analysis unit and sends it to the pressure regulating module 26.

[0028] The analysis process of the data analysis unit is: Feature extraction: Based on the image data of pollution degree data, color, texture and shape features are selected and meaningful features are extracted through SIFT feature extraction method; Classification identification: The convolutional neural network model is trained using the preprocessed data and extracted features. During the training process, the model parameters are adjusted through the back propagation algorithm to minimize the loss function. The model is verified using the validation set data, and the hyperparameters are adjusted to avoid overfitting. Back propagation calculates the gradient of the loss function with respect to the model parameters through the chain rule. ,in, Is a vector containing the loss function For all parameters The partial derivative of Classification recognition execution: New pollution level data is input into the trained convolutional neural network model. The convolutional neural network model automatically classifies and identifies the pollution level based on the characteristics of the input data and outputs classification results, such as light pollution, moderate pollution, and heavy pollution. Spraying pressure selection: Combined with the preset spraying strategy library, the spraying strategy is selected according to the classification and recognition results. The spraying strategy library corresponds to light pressure, moderate pressure and heavy pressure for light pollution, moderate pollution and heavy pollution respectively.

[0029] The pressure regulating module 26 includes a pressure regulating device unit and a signal receiving and executing unit. The pressure regulating device unit includes a pressure regulating valve. The signal receiving and executing unit receives the control signal from the data processing and analysis module 25 and drives the pressure regulating valve to drive the pump 27 to adjust the spraying pressure.

[0030] In this embodiment, when the aluminum alloy workpiece needs to be subjected to chromium-free passivation treatment, the workpiece is first clamped by the clamping device 6, and then the cylinder 5 is started. The workpiece clamped on the clamping device 6 is driven downward by the cylinder 5 until it moves to the inner side of the annular nozzle 8, and then the first servo motor 12 and the drive pump 27 can be started at the same time. The drive pump 27 transmits the water source to the annular nozzle 8 through the control module 28, and then the water is sprayed through the annular nozzle 8. When the output shaft of the first servo motor 12 rotates, the first gear 7 can be driven to rotate back and forth through the second gear 13. When the first gear 7 rotates back and forth, the annular nozzle 8 can be driven to rotate back and forth to spray and clean the workpiece. At the same time, when the annular nozzle 8 rotates back and forth, it can drive the movable ball 15 to squeeze the hemispherical block 17. The force generated by the ball 15 squeezing the hemispherical block 17 can drive the first gear 7 and the annular nozzle 8 to move upward along the sliding groove 9 through the sliding block 11. At this time, the spring 10 is stretched. When the movable ball 15 moves to the other side of the hemispherical block 17 and no longer squeezes the hemispherical block 17, the stretched spring 10 is reset, and at the same time drives the annular nozzle 8 to reset, so that the annular nozzle 8 rotates back and forth and sprays while moving up and down. After the spraying and cleaning is completed, the cylinder 5 is started to drive the workpiece clamped on the clamping device 6 to move upward, and the mobile device 4 moves along the support rail 3 to drive the workpiece to move, and the workpiece is moved to the top of the processing box 2. Finally, the workpiece clamped on the clamping device 6 is driven by the cylinder 5 to move down into the processing liquid for chromium-free passivation treatment. In this embodiment, when the workpiece needs to be sprayed and cleaned, the servo motor 21 can be started, and the threaded rod 22 can be driven to rotate by the servo motor 21. The force generated by the rotation of the threaded rod 22 can drive the circular plate 19 to move upward through the support of the guide plate 23, thereby blocking part of the nozzle of the annular nozzle 8, so that the upper and lower widths of the nozzle of the annular nozzle 8 are equal to the size of the workpiece. When the annular nozzle 8 sprays and cleans the workpiece, the pollution degree detection module 24 obtains the pollution degree data of the workpiece, and then the data processing and analysis module 25 analyzes and identifies the pollution degree data obtained by the pollution degree detection module 24, and divides the pollution degree of the workpiece into three categories: light pollution, moderate pollution and heavy pollution. Light pollution, moderate pollution and heavy pollution correspond to light pressure, moderate pressure and heavy pressure, respectively. The spraying pressure corresponding to the drive pump 27 is selected according to the pollution degree of the workpiece, and then the pressure regulating valve is driven by the pressure regulating module 26 to adjust the spraying pressure of the drive pump 27, so as to achieve precise spraying according to the pollution degree.

[0031] While preferred embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, and substitutions may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A chromium-free passivation treatment device for aluminum alloy, comprising a cleaning box (1) and a treatment box (2), characterized in that: The cleaning box (1) and the processing box (2) are fixedly connected, and a multi-dimensional cleaning component is provided on the cleaning box (1), and the multi-dimensional cleaning component comprises a driving pump (27) installed inside the cleaning box (1), a first gear (7) rotatably connected inside the cleaning box (1), an annular nozzle (8) slidingly arranged inside the first gear (7), a plurality of hemispherical blocks (17) installed inside the cleaning box (1), and a movable ball (15) installed at the bottom of the annular nozzle (8); the driving pump (27) is started to cause the annular nozzle (8) to spray, and the The first gear (7) drives the annular nozzle (8) to rotate back and forth and spray, and the movable ball (15) squeezes the hemispherical block (17) to drive the annular nozzle (8) to move up and down to spray; a servo motor (21) is installed at the bottom of the annular nozzle (8), and a threaded rod (22) is installed at the output end of the servo motor (21); a circular plate (19) is slidably provided on the inner side of the annular nozzle (8), and the threaded rod (22) is threadedly connected to the circular plate (19); a control system is provided on the cleaning box (1), and the control system includes: A contamination level detection module (24) is used to obtain contamination level data of the workpiece surface in real time through an optical sensor; A data processing and analysis module (25) is used to analyze the pollution degree data obtained by the pollution degree detection module (24) through a convolutional neural network, and select the spraying pressure required to drive the pump (27) through a preset spraying strategy library; The pressure regulating module (26) is used to adjust the spraying pressure of the driving pump (27) in real time according to the selection result of the data processing and analysis module (25).

2. The chromium-free passivation treatment device for aluminum alloy according to claim 1, characterized in that: A first servo motor (12) is installed inside the cleaning box (1), and a second gear (13) is installed at the output end of the first servo motor (12), and the second gear (13) is meshed with the first gear (7).

3. The chromium-free passivation treatment device for aluminum alloy according to claim 2, characterized in that: A sliding groove (9) is symmetrically provided on the outer side of the annular nozzle (8), a sliding block (11) is slidably provided inside the sliding groove (9), the sliding block (11) is fixedly connected to the first gear (7), a spring (10) is installed at the bottom of the sliding block (11), and the end of the spring (10) away from the sliding block (11) is fixedly connected to the inner wall of the sliding groove (9).

4. The chromium-free passivation treatment device for aluminum alloy according to claim 1, characterized in that: A first support plate (14) is installed at the bottom of the annular nozzle (8), the movable ball (15) is installed on the side of the first support plate (14) away from the annular nozzle (8), an arc plate (16) is installed on the inner side of the cleaning box (1), and the hemispherical blocks (17) are installed on the upper part of the arc plate (16). The number of the hemispherical blocks (17) is multiple groups and is evenly distributed around the circumference. The hemispherical blocks (17) are above the movement trajectory of the movable ball (15).

5. The chromium-free passivation treatment device for aluminum alloy according to claim 4, characterized in that: An annular groove (18) is provided on the inner side of the annular nozzle (8), and the circular plate (19) is slidably arranged on the inner side of the annular groove (18). A second support plate (20) is installed on the bottom of the annular nozzle (8), and the servo motor (21) is installed on the outer side of the second support plate (20). Guide plates (23) are symmetrically installed on the outer side of the second support plate (20), and the two guide plates (23) are slidably connected to the circular plate (19).

6. The chromium-free passivation treatment device for aluminum alloy according to claim 5, characterized in that: The size of the opening of the annular groove (18) is adapted to the size of the circular plate (19), and the circular plate (19) is tightly fitted to the inner wall of the annular groove (18).

7. The chromium-free passivation treatment device for aluminum alloy according to claim 1, characterized in that: A support rail (3) is installed on the upper part of the cleaning box (1), a moving device (4) is slidably provided on the outer side of the support rail (3), a cylinder (5) is installed at the bottom of the moving device (4), and a clamping device (6) is installed at one end of the cylinder (5) away from the moving device (4).

8. The chromium-free passivation treatment device for aluminum alloy according to claim 1, characterized in that: The data processing and analysis module (25) includes a data receiving unit, a data analysis unit and a control signal generating unit. The data receiving unit receives the pollution degree data from the pollution degree detection module (24). The data analysis unit analyzes the pollution degree data, classifies and identifies the pollution degree data through a convolutional neural network, and selects the spraying pressure to be adopted through a preset spraying strategy library. The control signal generating unit generates a control signal based on the analysis result of the data analysis unit and sends it to the pressure regulating module (26).

9. The chromium-free passivation treatment device for aluminum alloy according to claim 8, characterized in that: The analysis process of the data analysis unit is as follows: Feature extraction: Based on the image data of pollution degree data, color, texture and shape features are selected and meaningful features are extracted through SIFT feature extraction method; Classification identification: The convolutional neural network model is trained using the preprocessed data and extracted features. During the training process, the model parameters are adjusted by the backpropagation algorithm to minimize the loss function. The model is verified using the validation set data and the hyperparameters are adjusted to avoid overfitting. The backpropagation algorithm calculates the gradient of the loss function with respect to the model parameters by the chain rule. ,in, Is a vector containing the loss function For all parameters The partial derivative of Classification recognition execution: New pollution level data is input into the trained convolutional neural network model. The convolutional neural network model automatically classifies and identifies the pollution level based on the characteristics of the input data and outputs classification results, such as light pollution, moderate pollution, and heavy pollution. Spraying pressure selection: In combination with a preset spraying strategy library, a spraying strategy is selected according to the classification recognition result, wherein the spraying strategy library corresponds to light pollution, moderate pollution and heavy pollution with light pressure, moderate pressure and heavy pressure respectively.

10. The chromium-free passivation treatment device for aluminum alloy according to claim 1, characterized in that: The pressure regulating module (26) includes a pressure regulating device unit and a signal receiving and executing unit. The pressure regulating device unit includes a pressure regulating valve. The signal receiving and executing unit receives a control signal from the data processing and analyzing module (25) and drives the pressure regulating valve to adjust the spraying pressure of the driving pump (27).

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