A submerged uniform cavitation assisted electrolytic surface processing device and method

Abstract

This invention discloses a submerged uniform cavitation-assisted electrolytic surface processing device and method. A first switch and a first power supply are connected in series via wires between the positive and negative electrodes. A cavitation water jet generating system is installed between the positive electrode cavity and the processing tank, and between the negative electrode cavity and the processing tank. Each cavitation water jet generating system includes a high-pressure plunger pump connected by a high-pressure water pipe and a cavitation nozzle. The first end of the first high-pressure water pipe extends into the positive electrode cavity, and the first end of the second high-pressure water pipe extends into the negative electrode cavity. Both cavitation nozzles are completely submerged in the water of the processing tank. A moving platform moves the workpiece to be processed directly below the two cavitation nozzles. Two electromagnetic induction coils are sealed inside the platform's fixed base, with a corresponding cavitation nozzle directly above each electromagnetic induction coil. This invention can uniformly polish the workpiece surface and uniformly coat it with a deep coating. Uniform processing is achieved by guiding cavitation bubbles through a magnetic field generated by the specially designed nozzles and magnetic induction coils.

Description

Technical Field

[0001] This invention relates to the fields of machinery manufacturing, metal coating, and special processing, and specifically to a cavitation-assisted electrolytic surface processing device and method. Background Technology

[0002] With the development of modern industry, metal coating technology is increasingly widely used in industrial production and daily life, especially in fields such as automobile manufacturing, electronics manufacturing, machinery manufacturing, and aerospace. Metal coating technology can improve the corrosion resistance, wear resistance, electrical conductivity, and thermal conductivity of materials, while also beautifying the surface and extending service life. Currently, the main methods of metal coating include electroplating, spraying, thermal spraying, and chemical electroplating. Among these, electroplating is the most commonly used method. Consequently, plating types such as nickel-iron plating, iron-tin plating, gold-silver plating, and aluminum-silver plating have emerged. Although these coating types differ, they all suffer from problems such as insufficient adhesion, easy peeling, and insufficient thickness.

[0003] Currently, high-precision surface processing can be achieved using cavitation water jet surface processing technology. This technology utilizes the shock waves, micro-jet streams, and localized high temperatures generated by the collapse of cavitation bubbles to process surfaces, offering advantages such as low cost, high efficiency, environmental friendliness, and wide applicability. However, cavitation water jet processing can create eddies, leading to uneven processing and preventing surface coating during the process. For example, Chinese Patent No. CN201710822849.0 discloses a micro-part stamping and etching device and method based on high-pressure submerged cavitation water jets. This device can process micro-parts using high-pressure submerged cavitation water jets, but this method suffers from uneven processing, low efficiency, and the inability to coat the workpiece. For example, Chinese patent document CN201810562060.0 discloses an apparatus and method for plastic forming of micro-parts with micron-sized parts by artificial submerged cavitation jet. This method utilizes the interaction between abrasive particles and jets, which enhances the polishing and strengthening of the workpiece and is more efficient, but still cannot coat the material. Summary of the Invention

[0004] The purpose of this invention is to solve the above problems by proposing a submerged uniform cavitation assisted electrolytic surface processing device and its processing method, which can uniformly polish the surface and uniformly coat the surface, and improve the strength of the metal coating and the uniformity of cavitation water jet processing.

[0005] To achieve the above objectives, the present invention provides a submerged uniform cavitation-assisted electrolytic surface processing device, employing the following technical solution: It includes a water storage tank containing an electrolyte solution and a processing tank filled with water. The water storage tank is connected to the closed water tank via a water pump. An ion-exchange membrane divides the closed water tank into a positive electrode cavity and a negative electrode cavity, with the positive electrode and the negative electrode connected in series via wires. A first switch and a first power supply are connected in series between the positive electrode cavity and the processing tank, and between the negative electrode cavity and the processing tank. Each cavitation water jet generating system includes a high-pressure plunger pump connected by a high-pressure water pipe and a cavitation nozzle. The first end of the high-pressure water pipe... The first end of the second high-pressure water pipe extends into the positive electrode cavity, and the second end of the high-pressure water pipe extends into the negative electrode cavity. Each high-pressure water pipe is connected to a cavitation nozzle at its end. The two cavitation nozzles have the same structure and are completely submerged in the water of the processing tank. A platform fixing seat is fixedly connected to the bottom of the processing tank. The upper surface of the platform fixing seat is clamped with a positioning clamping device to hold the workpiece to be processed. The movable platform can move and drive the workpiece to be processed to be directly below the two cavitation nozzles respectively. Two electromagnetic induction coils are sealed inside the platform fixing seat. One of the cavitation nozzles is directly above each electromagnetic induction coil. Each electromagnetic induction coil is connected to a second power supply through a switch and a voltage controller.

[0006] Furthermore, the water pump, high-pressure plunger pump, and mobile platform are connected to the control system via their respective control lines.

[0007] Furthermore, the top of each cavitation nozzle is a nozzle inlet connected to a high-pressure water pipe. The middle section of each cavitation nozzle consists of a first cavity, a second cavity, multiple contraction orifices, and multiple expansion cavities that pass through it sequentially from top to bottom. Each contraction orifice is connected to an expansion cavity. The inner diameter of the first cavity is larger than the inner diameter of the second cavity, and the inner diameters of the multiple contraction orifices are smaller than the inner diameters of the expansion cavities. The lower section of each cavitation nozzle is a cavitation generating cavity that communicates with all the expansion cavities.

[0008] The processing method of the submerged uniform cavitation assisted electrolytic surface processing device of the present invention adopts the following technical solution and includes the following steps:

[0009] A water pump draws water to pump the electrolyte solution into a closed water tank. Once the closed water tank is full, the water pump stops pumping. The first switch is closed to connect the positive and negative electrodes. The electrolyte solution in the positive electrode chamber is acidic, and the electrolyte solution in the negative electrode chamber is alkaline. A pH detector is used to detect the pH value of the electrolyte solution in the positive and negative electrode chambers respectively. The first switch is closed when the pH value reaches the required level.

[0010] When the workpiece to be processed needs to be polished, the second high-pressure plunger pump in the second cavitation water jet generating system that extends into the positive electrode cavity is turned on, and at the same time, a second switch connected to the second electromagnetic induction coil is turned on. The second cavitation nozzle is directly above the second electromagnetic induction coil, and the acidic electrolytic medium solution is sprayed out from the second cavitation nozzle.

[0011] When the workpiece to be processed needs to be coated, the first high-pressure plunger pump in the first cavitation water jet generating system that extends into the negative electrode cavity is turned on, and at the same time a third switch connected to the first electromagnetic induction coil is turned on. The first cavitation nozzle is directly above the first electromagnetic induction coil, and the alkaline electrolytic medium solution is sprayed out from the first cavitation nozzle.

[0012] Furthermore, the moving platform moves the workpiece to be processed back and forth to directly below the second cavitation nozzle or the first cavitation nozzle, depending on the needs of polishing or coating.

[0013] The beneficial effects of the above-mentioned technical solution in this invention are:

[0014] (1) This invention combines electrolytic medium with cavitation jet and proposes to use magnetic and electric fields to guide the cavitation water jet for uniform processing, so that the outer wall of the cavitation bubble is coated with electrolytic medium. By utilizing the shock wave and local high temperature generated by the collapse of the cavitation bubble, the electrolytic medium is deeply deposited into the workpiece, which overcomes the problems of insufficient adhesion, easy peeling and insufficient thickness of traditional coating processes. Moreover, the polishing and coating processes are integrated.

[0015] (2) The present invention, through a longer cavitation generating cavity, enables the cavitation water jet to undergo the initial and development stages inside the generating cavity, avoiding excessive vortices formed by the cavitation jet that would lead to strength loss, and also enables the cavitation water jet to uniformly process the specified workpiece position.

[0016] (3) The present invention utilizes an electromagnet device combined with a charged medium. By using the magnetic field and electric field generated by the electromagnet device to influence the charged medium, irregularly moving cavitation bubbles can be effectively guided to a known position and the workpiece can be uniformly processed.

[0017] (4) This invention differs from conventional submerged cavitation water jet processing methods. It utilizes the different acid and alkali properties of the solution after electrolysis to perform integrated processing on the workpiece. It can uniformly polish the workpiece surface and uniformly coat the coating depth. It also uses a special nozzle and magnetic induction coil to generate a magnetic field to guide the cavitation bubbles and achieve uniform processing. Attached Figure Description

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0019] Figure 1 This is a schematic diagram of the structure of a submerged uniform cavitation assisted electrolytic surface processing device according to the present invention;

[0020] Figure 2 for Figure 1 An enlarged cross-sectional view of a cavitation nozzle structure;

[0021] Figure 3 for Figure 2 Sectional view of AA;

[0022] Figure 4 A schematic diagram illustrating the principle of a submerged cavitation water jet acting on the surface of a workpiece through a nozzle;

[0023] Figure 5 for Figure 1 Enlarged schematic diagram of the connection structure of the electromagnet device;

[0024] Figure 6 for Figure 1 Enlarged top view of the China Mobile platform and its related components.

[0025] In the diagram: 1. Water storage tank; 2. First drain valve; 3. Inlet; 4. Electrolyte storage device; 5. Stirrer; 6. Control system; 7. First switch; 8. Fuse; 9. First power supply; 10. Ion exchange membrane; 11. Sealed water tank; 12. Second pH detector; 13. Second filter; 14. First filter; 15. First pH detector; 16. Exhaust valve; 17. Air purifier; 18. Second high-pressure plunger pump; 19. First high-pressure plunger pump; 20. Second check valve; 21. First check valve; 22. Second regulating valve; 3. First regulating valve; 24. Second flow meter; 25. Second pressure gauge; 26. First flow meter; 27. First pressure gauge; 28. First cavitation nozzle; 29. ​​Second cavitation nozzle; 30. Positioning and clamping device; 31. Moving platform; 32. Second drain valve; 33. Water pump; 34. Platform fixing base; 35. Electromagnet device; 36. Wastewater treatment unit; 37. Cavitation generating chamber; 38. High-pressure jet; 39. Cavitation water jet; 40. Cavitation bubble; 41. Collapsed cavitation bubble; 42. Workpiece to be processed; 43. Processing tank; 44. Water pump;

[0026] 2801. Nozzle inlet; 2802. First cavity; 2803. Second cavity; 2804. Multiple contraction orifices; 2805. Multiple expansion cavities;

[0027] 3401. First limiting device; 3402. Second limiting device; 3403. Guide rail; 3404. First collision sensor; 3405. Second collision sensor;

[0028] 3501. Second power supply; 3502. Second switch; 3503. First voltage controller; 3504. First electromagnetic induction coil; 3505. Third switch; 3506. Second voltage controller; 3507. Second electromagnetic induction coil. Detailed Implementation

[0029] Figure 1 The present invention provides a submerged uniform cavitation assisted electrolytic surface processing device, comprising an electrolyte solution system for producing electrolyte, an electrolyzer, an exhaust gas treatment device, two cavitation water jet generating systems, a wastewater processor, a mobile platform, an electromagnet device, and a control system.

[0030] The electrolyte solution system includes a water storage tank 1, a first drain valve 2, a water inlet 3, an electrolyte storage device 4, and a stirrer 5. The water storage tank 1 stores the electrolyte solution. This system is connected to the electrolyzer via a water pipe and forms a recycling system with the wastewater treatment unit 36. The first drain valve 2 is installed on the bottom side wall of the water storage tank 1. Opening the first drain valve 2 allows the solution in the water storage tank 1 to be discharged. The water inlet 3 is located at the top of the water storage tank 1. The electrolyte storage device 4 contains electrolyte and is connected to the water storage tank 1 via a pipe, allowing the electrolyte to be input into the water storage tank 1. The stirrer 5 is fixed at the bottom inside the water storage tank 1 to fully mix the water and electrolyte to form the electrolyte solution. The stirrer 5 is connected to the control system 6 via a control line, and the control system 6 controls the start and stop of the stirrer 5. The water storage tank 1 is connected to the wastewater treatment unit 36 ​​via a pipe. The wastewater treatment unit 36 ​​outputs treated water that meets the standards and recycles it back into the water storage tank 1 for reuse.

[0031] The electrolyzer includes a sealed water tank 11, a first pH detector 12, a second pH detector 15, a first power supply 9, a fuse 8, a first switch 7, an exhaust valve 16, and an ion exchange membrane 10. The sealed water tank 11 is filled with an electrolyte solution. The ion exchange membrane 10 divides the sealed water tank 11 into two solution chambers, separating the electrolyte solution and forming a positive electrode chamber and a negative electrode chamber. During operation, positive ions move towards the negative electrode, and negative ions move towards the positive electrode, ensuring a clear distinction between the acidity and alkalinity of the solutions on both sides. Furthermore, the sealed space of the sealed water tank 11 does not provide external conditions for ion reduction. A pH detector is installed in both the positive and negative electrode chambers to detect the pH value of the solutions in the positive and negative electrode chambers, respectively. The pH value of the solution in the positive electrode chamber is detected by a second pH detector 12, and the pH value of the solution in the negative electrode chamber is detected by a first pH detector 15. The second pH detector 12 and the first pH detector 15 are connected to the control system 6 by their respective signal lines, transmitting their detected pH values ​​to the control system 6. A positive electrode is provided in the positive electrode chamber, and a negative electrode is provided in the negative electrode chamber. The positive and negative electrodes are connected in series by a first switch 7, a fuse 8, and a first power supply 9 to control the operation of the electrolyzer. When the first switch 7 is closed, the positive and negative electrodes are connected, changing the pH value of the electrolyte solution in the positive and negative electrode chambers.

[0032] A water pipe connects the water storage tank 1 and the closed water tank 11. A water pump 44 is installed on the water pipe. The water pump 44 is connected to the control system 6 via a control line. After the water pump 44 is turned on, it pumps the electrolyte in the water storage tank 1 into the closed water tank 11.

[0033] A cavitation water jet generating system is installed between the positive electrode cavity and the processing tank 43, and between the negative electrode cavity and the processing tank 43. Each cavitation water jet generating system includes a high-pressure plunger pump and a cavitation nozzle connected by a high-pressure water pipe. The positive electrode cavity of the closed water tank 11 is connected to the first cavitation jet generating system, and the negative electrode cavity of the closed water tank 11 is connected to the second cavitation jet generating system. An exhaust valve 16 is installed at the top of the closed water tank 11, and the closed water tank 11 is connected to the exhaust gas treatment device 17 through the exhaust valve 16. The exhaust gas treatment device 17 is connected to the control system 6 via a control line.

[0034] The two cavitation water jet generating systems have identical compositions. The first cavitation jet system includes a first filter 14, a first high-pressure plunger pump 19, a first check valve 21, a first regulating valve 23, a first flow meter 26, a first pressure gauge 27, and a first cavitation nozzle 28, all connected in sequence by a high-pressure water pipe. The first cavitation nozzle 28 extends vertically into the processing tank 43 and is completely submerged in the water within the tank. Similarly, the second cavitation jet system includes a second filter 13, a second high-pressure plunger pump 18, a second check valve 20, a second regulating valve 22, a second flow meter 24, a second pressure gauge 25, and a second cavitation nozzle 29, all connected in sequence by a high-pressure water pipe. The second cavitation nozzle 29 also extends vertically into the processing tank 43 and is completely submerged in the water within the tank. Therefore, the first end of the high-pressure water pipe in the first cavitation jet system extends into the negative electrode cavity, and the second end connects to the first cavitation nozzle 28. The first end of the high-pressure water pipe in the second cavitation jet system extends into the positive electrode cavity, and the second end connects to the second cavitation nozzle 29. Both the first high-pressure plunger pump 19 and the first high-pressure plunger pump 18 are connected to the control system 6 via control lines to control their start and stop. When the first high-pressure plunger pump 19 and the first high-pressure plunger pump 18 are working, they can pump the electrolyte in the negative electrode chamber and the positive electrode chamber into the corresponding nozzles for spraying. The second flow meter 24, the second pressure gauge 25, the first pressure gauge 27, and the first cavitation nozzle 28 are all connected to the control system 6 via signal lines to transmit the detected flow and pressure signals in the high-pressure water pipe of the water jet generating system to the control system 6.

[0035] A second drain valve 32 is installed at the bottom of the processing tank 43. The second drain valve 32 is connected to the sewage treatment unit 36 ​​via a water pipe. The bottom of the sewage treatment unit 36 ​​is connected to the water storage tank 1 via a water pipe and a water suction pump 33. The water suction pump 33 is connected to the control system 6 via a control line. When the water suction pump 33 is working, it pumps the clean water in the sewage treatment unit 36 ​​into the water storage tank 1 for reuse.

[0036] The processing tank 43 is filled with water, and a platform mounting base 34 is fixedly connected to the bottom of the processing tank 43. The platform mounting base 34 is horizontally positioned, and a movable platform 31 is mounted on the upper surface of the platform mounting base 34. The workpiece 42 to be processed is clamped on the upper surface of the movable platform 31 by a positioning clamping device 30. The movable platform 31 is horizontally positioned and uses a conventional horizontal guide rail platform, which can move back and forth along the XY horizontal plane. The movable platform 31 is connected to the control system 6 via a control line, which drives the movable platform 31 to move on the upper surface of the platform mounting base 34. When the movable platform 31 moves, it can move the workpiece 42 to be processed directly below the first cavitation nozzle 28 or the second cavitation nozzle 29.

[0037] A sealing groove is formed inside the platform mounting base 34, and two electromagnetic induction coils are installed in the sealing groove. The two electromagnetic induction coils are located below the moving platform 31 and the workpiece 42 to be processed. The two electromagnetic induction coils are connected to a power source outside the processing groove 43 via wires. The positions of the two electromagnetic induction coils correspond to the first cavitation nozzle 28 and the second cavitation nozzle 29, with a cavitation nozzle directly above one of the electromagnetic induction coils.

[0038] The first cavitation nozzle 28 and the second cavitation nozzle 29 have the same structure, as follows: Figure 2 Taking the first cavitation nozzle 28 as an example: The top of the first cavitation nozzle 28 is the nozzle inlet 2801, which connects to a high-pressure water pipe. The middle section of the first cavitation nozzle 28, from top to bottom, consists of a first cavity 2802, a second cavity 2803, multiple contraction orifices 2804, and multiple expansion cavities 2805, each contraction orifice 2804 connected to an expansion cavity 2805. The nozzle inlet 2801 communicates with the first cavity 2802. The inner diameter of the first cavity 2802 is larger than the inner diameter of the second cavity 2803. The inner diameters of the multiple contraction orifices 2804 are smaller than the inner diameters of the expansion cavities 2805, and the inner diameter of the expansion cavities 2805 is much smaller than the inner diameter of the second cavity 2803. The lower section of the second cavitation nozzle 28 is the cavitation generating chamber 37, which communicates with all the expansion cavities 2805 above it. The length of the cavitation generating chamber 37 is at least twice the total length of all cavities in the middle section of the first cavitation nozzle 28, and it is elongated.

[0039] like Figure 3 As shown, the multiple contraction cavities 2804 and expansion cavities 2805 are arranged in an array and are relatively dense.

[0040] like Figure 4As shown, when the first cavitation nozzle 28 and the second cavitation nozzle 29 are working, the high-pressure jet 38 ejected from the high-pressure water pipe enters the first cavity 2802 through the nozzle inlet 2801, and then enters the second cavity 2803. In the second cavity 2803, the jet is further accelerated, and after acceleration, the jet enters multiple contraction orifice cavities 2804. In the multiple contraction orifice cavities 2804, the jet is split, and each orifice generates a cavitation jet 39, which interferes with each other at the jet contact surface, causing the vortex to become turbulent or even disappear. Because the volume becomes instantly smaller in the contraction orifice cavities 2804, the jet is greatly accelerated, thus generating a cavitation effect, and finally ejected through multiple expansion cavities 2805. Because the jet is ejected through multiple orifices and the gap between the orifices is small, the mutual interference of the jets further enhances the cavitation conditions. When the jet collides with the generating cavity 37, some cavitation bubbles collapse 41, forming collapsed cavitation bubbles 41. Therefore, the porous structure of the first cavitation nozzle 28 and the second cavitation nozzle 29 enhances the uniformity of cavitation generation, producing a cavitation water jet 39 in the cavitation generation chamber 37. Using a relatively long cavitation generation chamber 37 extends its height, causing irregularly moving cavitation bubbles 40 to collapse prematurely or controlling the movement direction of the cavitation bubbles 40 by restricting the jet direction. Some cavitation bubbles 40 are further guided by the cavitation generation chamber 37 and are perpendicularly ejected onto the surface of the workpiece 42.

[0041] like Figure 1 and Figure 5 The electromagnet device 35 shown includes a power supply, a switch, a voltage controller, and two electromagnetic induction coils. Sealed inside the platform mounting base 34 are the first electromagnetic induction coil 3504 and the second electromagnetic induction coil 3507. The first electromagnetic induction coil 3504 is directly below the first cavitation nozzle 28, with their center lines coinciding; the second electromagnetic induction coil 3507 is directly below the second cavitation nozzle 29, with their center lines coinciding. Each electromagnetic induction coil is connected to the second power supply 3501 via a switch and a voltage controller. The power supply, switch, and voltage controller are all located outside the processing tank 43. The first electromagnetic induction coil 3504 is connected to the second power supply 3501 via the second switch 3502 and the first voltage controller 3503, and the second electromagnetic induction coil 3507 is connected to the second power supply 3501 via the third switch 3505 and the second voltage controller 3506. The two electromagnetic induction coils are switched on and off by the second switch 3502 and the third switch 3505 respectively. The first voltage controller 3503 and the second voltage controller 3506 control the voltage to change, thereby changing the current in the branch. This causes the two electromagnetic induction coils to generate a variable magnetic field, which affects the charged medium of ions generated by the ionization of the electrolyte. This guides the cavitation bubble 40 with the charged medium to move toward the workpiece 42 to be processed, and further guides the cavitation bubble 40 to be uniformly processed at a fixed point on the workpiece 42.

[0042] like Figure 6As shown, a guide rail 3403 is provided on the upper surface of the platform mounting base 34. The guide rail 3403 is arranged along the direction between the first cavitation nozzle 28 and the second cavitation nozzle 29. The guide rail 3403 cooperates with the moving platform 31, allowing the moving platform 31 to move back and forth along the guide rail 3403. The upper surface of the moving platform 31 is the workpiece 42 to be processed, which is moved to a position directly below the first cavitation nozzle 28 and the second cavitation nozzle 29. The moving platform 31 has its own motor and lead screw and nut mechanism, which are sealed and isolated from water. The workpiece 42 is fixed on both sides by positioning clamping devices 30, which are fixed to the moving platform 31. Limiting devices and collision sensors are provided on both sides of the moving platform 31. The limiting devices limit the movement position of the moving platform 31, and the moving platform 31 stops when it contacts the collision sensor. The limiting devices are the first limiting device 3401 and the second limiting device 3402, and the collision sensors are the first collision sensor 3404 and the second collision sensor 3405. The first collision sensor 3404 and the second collision sensor 3405 are connected to the control system 6 via signal lines.

[0043] See Figure 1-6 As shown, when the processing device of this invention is working, an electrolyte aqueous solution is electrolyzed into an acid-base solution using an electrolyzer. The alkaline solution contains a large number of metal ions, and the acidic solution contains a large number of hydroxide ions. The shock wave generated by the collapse of cavitation bubbles in a high-pressure submerged cavitation water jet, combined with the localized high temperature and the metal ions in the alkaline solution, is used to apply a deep metal coating to the material. The shock wave generated by cavitation bubble collapse, the micro-jet, and the localized high temperature combined with the acidic solution are also used to polish the workpiece, achieving integrated polishing and coating. Two specially designed nozzles and the electric and magnetic fields generated by a controllable voltage electromagnet guide the charged dielectric in the cavitation bubbles to achieve uniform cavitation. Specifically:

[0044] First, water is poured into the processing tank 43, completely submerging the workpiece 42, the first cavitation nozzle 28, and the second cavitation nozzle 29. The water level is lowered to 20cm from the top of the processing tank 43. Then, electrolyte from the electrolyte storage device 4 is added to the water storage tank 1 as needed. The electrolyte is a type of electrolyte such as NaCl or CaCO3. The control system 6 controls the stirrer 5 to start working, stirring the electrolyte solution evenly before stopping. The control system 6 then controls the water pump 44 to pump water, and the evenly stirred electrolyte solution enters the closed water tank 1. Once the closed water tank 1 is full, the water pump 44 stops pumping water.

[0045] After the sealed water tank 1 is filled with electrolyte solution, the first switch 7 is closed to turn on the power and start working, connecting the positive and negative electrodes, and electrolyzing the electrolyte solution to produce positive and negative ions. The positive ions move towards the negative electrode through the ion membrane 10, and the negative ions move towards the positive electrode through the ion membrane 10, thereby generating an acidic electrolytic medium at the positive electrode in the positive electrode cavity, and the electrolyte solution in the positive electrode cavity is acidic. At the negative electrode in the negative electrode cavity, an alkaline electrolytic medium is generated, and the electrolyte solution in the negative electrode cavity is alkaline. The solutions on both sides are separated by the ion membrane 10.

[0046] When the workpiece 42 only requires polishing, the acidic electrolytic medium solution is ejected from the second cavitation nozzle 29. Therefore, the first cavitation water jet generating system does not work, and only the second cavitation water jet generating system works. When the second pH detector 12 detects that the pH value of the acidic solution in the positive electrode cavity reaches the required level (pH < 3), the first switch 7 closes, and the electrolyzer stops working. Then, the control system 6 controls the second switch 3502 to open, energizing the second electromagnetic induction coil 3507 directly below the second cavitation nozzle 29 to generate a magnetic field. During this process, the voltage is changed by the second voltage controller 3503, thereby changing the magnitude of the magnetic field of the second electromagnetic induction coil 3507. Subsequently, the control system 6 controls the moving platform 31 to translate towards the second cavitation nozzle 29. When the second cavitation nozzle 29 contacts the second limit device 3403, it stops moving. The second collision sensor 3405 feeds a signal back to the control system 6. At this time, the second cavitation water jet generating system starts working: the second high-pressure plunger pump 18 is turned on, and the inlet pressure of the second cavitation nozzle 29 is adjusted by regulating the second regulating valve 22 and observing the second pressure gauge 25. The acidic electrolytic medium passes through the second filter 13 and the second high-pressure plunger pump 18, and is monitored by the second flow meter 24 and the second pressure gauge 25, which feeds back to the control system 6. Finally, the acidic cavitation jet generated by the second cavitation nozzle 29 polishes the surface of the workpiece 42. After the workpiece 42 is processed, all working devices are stopped and the power is turned off.

[0047] When only a metal coating is needed on the workpiece 42, the alkaline electrolytic medium solution is ejected from the first cavitation nozzle 28. Therefore, the second cavitation water jet generating system does not work, and only the first cavitation water jet generating system works. When the first pH detector 15 detects that the pH value of the alkaline solution in the negative chamber reaches the required level (pH>11), the first switch 7 closes to stop the electrolyzer from working and feeds back to the control system 6. The control system 6 controls the second switch 3502 to open, and the first electromagnetic induction coil 3504 starts working. During this process, the voltage is changed by the first voltage controller 3503, thereby changing the magnetic field strength of the first electromagnetic induction coil 3504. Subsequently, the control system 6 controls the moving platform 31 to move towards the first cavitation nozzle 28. When the moving platform 31 contacts the first limit device 3401, it stops moving. The first collision sensor 3404 feeds a signal back to the control system 6, and the first cavitation water jet generating system starts working: the first high-pressure plunger pump 19 is turned on, and the inlet pressure of the first cavitation nozzle 28 is adjusted by regulating the first regulating valve 23 and observing the first pressure gauge 27. The electrolytic medium containing metal ions passes through the first filter 14 and the first high-pressure plunger pump 19, and is monitored by the first flow meter 26 and the first pressure gauge 27, and the feedback is fed back to the control system 6. Finally, the cavitation jet containing the medium containing metal ions is generated through the first cavitation nozzle 28 to perform metal coating treatment on the workpiece 42 to be processed. After the workpiece 42 to be processed is completed, all working devices are stopped and the power is turned off.

[0048] When polishing and coating of the workpiece 42 are required simultaneously, the workpiece 42 is processed according to the required sequence of polishing and coating processes. During this process, the moving platform 31 moves the workpiece back and forth to the area directly below the second cavitation nozzle 29 or the first cavitation nozzle 28, depending on the needs of polishing or coating. For example, if polishing is required before coating, the second pH detector 12 detects that the pH value of the acidic solution has reached the required level (pH < 3), the electrolyzer stops working, and feedback is sent to the control system 6, which turns on the third switch 3505. The second electromagnetic induction coil 3507 starts working, the moving platform 31 moves towards the second cavitation nozzle 29, and the second high-pressure plunger pump 18 is turned on. Finally, an acidic cavitation jet is generated through the second cavitation nozzle 29 to polish the surface of the workpiece 42. After the required polishing time is reached, the second high-pressure plunger pump 18 is turned off, and the third switch 3505 is closed. Then, the coating process is performed: the control platform 31 moves towards the first special nozzle 28, the second switch 3502 is turned on, the first electromagnetic induction coil 3504 starts working, and the first high-pressure plunger pump 19 is turned on. The electrolytic medium containing metal ions passes through the first filter 14 and the first high-pressure plunger pump 19, and is monitored by the first flow meter 26 and the first pressure gauge 27, which provides feedback to the control system 6. Finally, the cavitation jet containing metal ions is generated through the first cavitation nozzle 28 to perform metal coating treatment on the workpiece 42. At this point, the polishing and coating process is completed, and the electromagnet device 35 stops operating.

[0049] The waste gas generated during electrolysis enters the air purifier 17 through the exhaust valve 16 for purification and is then discharged. The wastewater generated during processing enters the wastewater treatment unit 36 ​​through the second drain valve 32. After the wastewater is treated, it is sucked up by the water pump 33 and returned to the water storage tank 1 for reuse.

Claims

1. A submerged uniform cavitation-assisted electrolytic surface processing device, comprising a water storage tank (1) containing an electrolyte solution and a processing tank (43) filled with water, characterized in that: The water storage tank (1) is connected to the closed water tank (11) via a water pump (44). The ion membrane (10) divides the closed water tank (11) into a positive electrode cavity with a positive electrode and a negative electrode cavity with a negative electrode. The positive electrode and the negative electrode are connected in series via wires to a first switch (7), a fuse (8) and a first power supply (9). A cavitation water jet generating system is provided between the positive electrode cavity and the processing tank (43) and between the negative electrode cavity and the processing tank (43). Each cavitation water jet generating system includes a high-pressure plunger pump and a cavitation nozzle connected by a high-pressure water pipe. The first end of the first high-pressure water pipe extends into the negative electrode cavity, and the first end of the second high-pressure water pipe extends into the positive electrode cavity. Each end of the high-pressure water pipe is connected to a cavitation nozzle. The two cavitation nozzles have the same structure and are completely submerged in the water in the processing tank (43). The bottom of the processing tank (43) is fixedly connected to the platform fixing seat (34). The upper surface of the platform fixing seat (34) is clamped with the workpiece to be processed by the positioning clamping device (30). The moving platform (31) can move and drive the workpiece to be processed to move directly below the two cavitation nozzles respectively. The platform mounting base (34) has two electromagnetic induction coils sealed inside. Above each electromagnetic induction coil is a corresponding cavitation nozzle. Each electromagnetic induction coil is connected to a second power supply (3501) through a switch and a voltage controller.

2. The submerged uniform cavitation assisted electrolytic surface processing device according to claim 1, characterized in that: The water pump (44), high-pressure plunger pump, and mobile platform (31) are connected to the control system (6) via their respective control lines.

3. The submerged uniform cavitation assisted electrolytic surface processing device according to claim 1, characterized in that: The top of each cavitation nozzle is a nozzle inlet (2801) connected to a high-pressure water pipe. The middle section of each cavitation nozzle consists of a first cavity (2802), a second cavity (2803), multiple contraction cavities (2804), and multiple expansion cavities (2805) that pass through it sequentially from top to bottom. Each contraction cavity (2804) is connected to an expansion cavity (2805). The inner diameter of the first cavity (2802) is larger than the inner diameter of the second cavity (2803), and the inner diameter of the multiple contraction cavities (2804) is smaller than the inner diameter of the expansion cavity (2805). The lower section of each cavitation nozzle is a cavitation generating cavity (37), which is connected to all the expansion cavities (2805).

4. A submerged uniform cavitation-assisted electrolytic surface processing apparatus according to claim 1, 2, or 3, characterized in that: The water storage tank (1) is equipped with a first drain valve (2) at the bottom side wall and a water inlet (3) at the top. A stirrer (5) is fixedly installed at the bottom of the water storage tank (1). An exhaust valve (16) is installed at the top of the closed water tank (11) and is connected to the waste gas treatment device (17) through the exhaust valve (16).

5. A submerged uniform cavitation-assisted electrolytic surface processing apparatus according to claim 1, 2, or 3, characterized in that: Each high-pressure water pipe in each cavitation water jet generating system is sequentially connected to a filter, a high-pressure plunger pump, a check valve, a regulating valve, a flow meter, a pressure gauge, and a cavitation nozzle.

6. A submerged uniform cavitation-assisted electrolytic surface processing apparatus according to claim 1, 2 or 3, characterized in that: A second drain valve (32) is installed at the bottom of the processing tank (43). The second drain valve (32) is connected to the sewage processor (36) via a water pipe. The bottom of the sewage processor (36) is connected to the water storage tank (1) via a water pipe and a water pump (33).

7. A submerged uniform cavitation-assisted electrolytic surface processing apparatus according to claim 1, 2, or 3, characterized in that: A guide rail (3403) is provided on the upper surface of the platform fixing base (34). The guide rail (3403) is arranged in the direction between the first cavitation nozzle (28) and the second cavitation nozzle (29). The guide rail (3403) cooperates with the mobile platform (31). Limiting devices and collision sensors are provided on both sides of the mobile platform (31).

8. A processing method for the submerged uniform cavitation assisted electrolytic surface processing apparatus as described in claim 1, characterized in that... It includes the following steps: The water pump (44) pumps water and pumps the electrolyte solution into the closed water tank (11). After the closed water tank (11) is full, the water pump (44) stops pumping water. The first switch (7) is closed to connect the positive and negative electrodes. The electrolyte solution in the positive electrode chamber is acidic and the electrolyte solution in the negative electrode chamber is alkaline. The pH value of the electrolyte solution in the positive and negative electrode chambers is detected by a pH value detector. The first switch (7) is closed when the pH value reaches the required level. When the workpiece (42) to be processed needs to be polished, the second high-pressure plunger pump (18) of the second cavitation water jet generating system that extends into the positive electrode cavity is turned on, and at the same time a second switch connected to the second electromagnetic induction coil (3507) is turned on. The second cavitation nozzle (29) is directly above the second electromagnetic induction coil (3507), and the acidic electrolytic medium solution is sprayed out from the second cavitation nozzle (29). When the workpiece (42) to be processed needs to be coated, the first high-pressure plunger pump (19) of the first cavitation water jet generating system that extends into the negative electrode cavity is turned on, and at the same time a third switch connected to the first electromagnetic induction coil (3504) is turned on. The first cavitation nozzle (28) is directly above the first electromagnetic induction coil (3504), and the alkaline electrolytic medium solution is sprayed out from the first cavitation nozzle (28).

9. The processing method according to claim 8, characterized in that: The moving platform (31) moves the workpiece to be processed back and forth to the direct below the second cavitation nozzle (29) or the first cavitation nozzle (28) as needed for polishing or coating.

10. The processing method according to claim 8, characterized in that: The voltage is changed by a voltage controller, which in turn changes the magnitude of the magnetic field in the two electromagnetic induction coils.

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