Aluminum foil oxidation treatment device and method

Abstract

The application discloses an aluminum foil oxidation treatment device and method, and relates to the field of aluminum foil production equipment. The aluminum foil oxidation treatment device comprises a groove body, the groove body is sequentially provided with an alkali washing pool, a first water washing pool, a stain removing pool, a second water washing pool, an anode oxidation pool, a third water washing pool, a sealing pool and a fourth water washing pool, guide rollers are arranged at both ends of each pool, and anti-deviation components are arranged at both ends of the groove body; mounting frames are arranged at both ends of the anode oxidation pool, upper pressing rollers are arranged on the mounting frames, lower pressing rollers are arranged on the upper pressing rollers, and adjusting mechanisms are arranged on the mounting frames; the lower pressing rollers are adjusted by hydraulic cylinders; the first water washing pool, the neutralization pool, the second water washing pool, the anode oxidation pool, the third water washing pool, the sealing pool and the fourth water washing pool are externally provided with circulating pipelines, spraying devices are arranged in the alkali washing pool, the first water washing pool, the neutralization pool and the second water washing pool, and impurities are prevented from adhering to the surface of the aluminum foil during the pretreatment process. The circulating pipeline of the anode oxidation pool is communicated with an external cooling machine, and the high temperature during the oxidation of the anode oxidation pool is cooled.

Description

Technical Field

[0001] This invention relates to the field of aluminum foil production equipment technology, specifically to an aluminum foil oxidation treatment device and method. Background Technology

[0002] Aluminum foil undergoes electrochemical corrosion and anodizing to form a dense insulating aluminum oxide film on its surface. This process is the core step in manufacturing the anode foil for high-performance aluminum electrolytic capacitors. The quality of the anodizing process (applying direct current to the aluminum foil in an electrolyte such as sulfuric acid) directly determines the uniformity and integrity of the oxide film (dielectric layer).

[0003] Existing large-scale continuous anodizing production lines typically consist of units sequentially arranged for alkaline washing, acid washing, water washing, anodizing, sealing, and drying. The aluminum foil strip continuously passes through each treatment tank under the traction of the unwinding and rewinding devices. During the pretreatment stage before anodizing (such as alkaline washing and acid washing), trace impurities may remain on the aluminum foil surface, or stains that are difficult to completely remove may form due to process fluctuations. When the aluminum foil enters the anodizing tank and comes into contact with the upper pressure roller, these residues can easily cause the lower and upper pressure rollers to press together, resulting in the adhesion of pretreatment impurities to the aluminum foil surface. Consequently, when the aluminum foil enters the anodizing tank for oxidation, it can easily lead to poor contact between the aluminum foil and the electrolyte or increased resistance. The aluminum foil in the area with abnormal contact cannot effectively form an oxide film due to insufficient current density or even current interruption. The formation of strip-shaped "oxidation leakage" or "weak oxide film" defects on the surface of the finished foil seriously affects the product qualification rate and capacitor performance. Secondly, during high-speed continuous production, the upper pressure roller continuously passes through a large number of pre-treated aluminum foils. During the pre-treatment process, chemical heating occurs during alkaline washing and acid washing. The increased surface temperature accelerates the local evaporation and crystallization of the electrolyte, further deteriorating the contact state between the aluminum foil and the upper pressure roller, exacerbating the above-mentioned defects. Furthermore, if the large amount of electrolyte adhering to the surface of the anodized aluminum foil is not replaced or initially diluted in a timely and uniform manner before entering the subsequent water washing and sealing tank, the oxide film may be dissolved again during the transportation process due to uneven electrolyte concentration or local drying, resulting in new surface defects.

[0004] To address the aforementioned issues, particularly to ensure stable, low-resistance electrical contact between the aluminum foil and the upper pressing roller under high current and continuous operation, and to effectively clean the contact interface, control the roller surface temperature, and optimize the initial cleaning effect of the electrolyte on the aluminum foil surface after oxidation, a novel aluminum foil oxidation treatment device and method are urgently needed. Summary of the Invention

[0005] The purpose of this invention is to provide an aluminum foil oxidation treatment apparatus and method to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an aluminum foil oxidation treatment device, comprising a tank, wherein an alkaline washing tank, a first water washing tank, a stain removal tank, a second water washing tank, an anodizing tank, a third water washing tank, a sealing tank, and a fourth water washing tank are sequentially arranged along the traveling direction of the aluminum foil strip within the tank. Guide rollers are provided at both ends of the top of each tank. A feeding roller is provided at the inlet end of the tank, and a take-up roller is provided at the outlet end. The take-up roller is connected to a winding machine that drives its rotation. A drying chamber is provided between the tank and the take-up roller. Anti-deviation components for correcting aluminum foil strip deviation are respectively provided at the inlet and outlet ends of the tank. Mounting frames are provided at the top of both ends of the anodizing tank. An upper pressing roller is arranged side by side, and a lower pressing roller is arranged directly above the upper pressing roller to press the aluminum foil strip. An adjustment mechanism for adjusting the pressing force between the lower pressing roller and the upper pressing roller is installed on the mounting frame. The upper pressing roller has a hollow cooling chamber inside, and a circulation pipe is provided outside the chamber. The circulation pipe is rotatably connected to the cooling chamber of the upper pressing roller through a rotating shaft sleeve for introducing a cooling medium into the cooling chamber. Airbag sleeves are rotatably fitted at both ends of the lower pressing roller. The bottom of the airbag sleeve has an air blowing port that is inclined downward toward the contact area between the upper pressing roller and the aluminum foil strip. An air blowing component for supplying air to the airbag sleeve is provided on the mounting frame.

[0007] Preferably, the upper pressing roller has multiple micropores on its roller surface that communicate with its internal cooling cavity, and the roller surface of the upper pressing roller is covered with a hydrophilic filter membrane.

[0008] Preferably, the air-blowing component includes a rotating body mounted on one end of the upper pressure roller. An eccentric block is provided within the rotating body, and a track groove is formed on the rotating body. A compression block is slidably disposed within the track groove, and the compression block contacts the eccentric block. A piston rod is connected to the top of the compression block. A piston sleeve is fixed on a mounting bracket, and one end of the piston rod extends into the piston sleeve. A receiving air pipe is connected to the top of the piston sleeve, and the receiving air pipe communicates with the airbag sleeve via a flexible hose. When the upper pressure roller rotates, it drives the rotating body and the eccentric block to rotate, thereby driving the piston rod to reciprocate within the piston sleeve via the compression block, generating a pulsating airflow.

[0009] Preferably, the adjustment mechanism includes a mounting plate fixedly mounted on the mounting frame, a hydraulic telescopic tube mounted on the mounting plate, an mounting sleeve provided at the output end of the hydraulic telescopic tube, rotating rollers mounted at both ends of the lower pressing roller, and the mounting sleeve sleeved on the rotating roller; a rotating area is opened on the lower pressing roller, and the airbag sleeve is rotatably mounted at the rotating area.

[0010] Preferably, a connecting horizontal tube is connected between the two airbag sleeves, and multiple air holes are distributed on the connecting horizontal tube. Each air hole is equipped with an electrically controlled valve. A connecting sleeve is provided on the outside of the airbag sleeve. The connecting sleeve has an installation groove that mates with the mounting sleeve. A circular hole is opened at the top of the connecting sleeve for the hydraulic telescopic tube to pass through. Multiple fixed connecting rods are connected between the connecting sleeve and the airbag sleeve.

[0011] Preferably, conductive plates are symmetrically distributed on both sides of the aluminum foil strip in the anodizing tank. The conductive plates are connected to an external power supply, and their surfaces facing the aluminum foil strip are wavy.

[0012] Preferably, each of the first, second, third, and fourth washing pools has an independent spraying mechanism. The spraying mechanism includes a U-shaped pipe, which is connected to the inner wall of the washing pool by a mounting bracket. Multiple spray pipes are distributed on the U-shaped pipe, and each spray pipe has multiple water outlet holes. An independent water storage pipe is provided outside the pool, and the water storage pipe is connected to the U-shaped pipe through a bend to supply water to the spraying mechanism.

[0013] Preferably, the anti-deviation assembly includes a base frame, on which a frame body is mounted, and within the frame body is a rotating roller driven by a drive motor, with an anti-deviation roller sleeved on the rotating roller; a photoelectric sensor for detecting the edge position of the aluminum foil strip is mounted on the top of the frame body; an inlet roller is mounted on the outer side of the frame body, and balance rollers are mounted at both ends of the trough.

[0014] Preferably, a sealing cover is installed at the top of each pool in the tank; the circulation pipe is independently connected to each pool, specifically: the upper part of the pool wall of each pool is provided with a water inlet hole connected to the circulation pipe, and the lower part of the pool wall of each treatment pool is provided with a drain hole connected to the circulation pipe, wherein the diameter of the water inlet hole is larger than the diameter of the drain hole.

[0015] An aluminum foil oxidation process using an aluminum foil oxidation processing apparatus includes the following steps: S1: Feeding and threading: The aluminum foil roll to be processed is installed on the feed roller, and the aluminum foil strip is pulled through each processing pool and drying box in the tank and fixed to the take-up roller. S2: Pre-treatment: Start the winding machine, and the aluminum foil strip continuously passes through the alkaline washing tank for degreasing. After rinsing in the first water washing tank, it enters the stain removal tank for acid washing to remove surface oxides and residual impurities, and then is thoroughly rinsed in the second water washing tank. S3: Anodizing: The pretreated aluminum foil strip enters the anodizing tank through the upper and lower pressure rollers, where an aluminum oxide film is generated in the electrolyte; The following steps are performed simultaneously during the anodizing process: S31: Contact pressure adjustment: The adjustment mechanism controls the lower pressing roller to apply stable pressure to the aluminum foil strip to ensure good contact between it and the upper pressing roller; S32: Contact area cooling and cleaning: The cooling medium flows into the cooling chamber of the upper pressing roller through the circulation pipe and the rotating shaft sleeve to cool the roller body, and then wets and cleans the contact interface through the micropores of the roller surface and the diffusion of the hydrophilic filter membrane. S33: Interface purging: The air blowing component is triggered when the upper pressure roller rotates, supplying air to the airbag sleeve. The airflow is ejected from the air blowing port to purge any droplets, crystals or tiny impurities that may exist on the surface of the contact area between the upper pressure roller and the aluminum foil strip. S4: Post-processing: After the oxidized aluminum foil strip is initially cleaned in the third washing tank, it enters the sealing tank for sealing treatment, and then undergoes final rinsing in the fourth washing tank. S5: Drying and winding: The rinsed aluminum foil strip enters the drying chamber for drying, and is finally wound into finished product by the winding machine.

[0016] Compared with the prior art, the beneficial effects of the present invention are: This invention ensures continuous, stable, and pressure-controllable contact between the aluminum foil strip and the upper pressing roller by setting an upper pressing roller with cooling chambers at both ends of the anodizing pool, and cooperating with a lower pressing roller and an adjustment mechanism. The air blowing component cleans the impurities between the upper and lower pressing rollers, preventing impurities from adhering to the aluminum foil surface during the pretreatment process, thus providing a foundation for high-quality anodizing.

[0017] The upper pressing roller is cooled directly by circulating cooling medium, which effectively removes the heat generated during the pretreatment of a large number of aluminum foils, preventing the upper pressing roller from overheating, deforming or being damaged. At the same time, it stabilizes the interface temperature of the aluminum foil strip, which is conducive to the formation of a uniform oxide film.

[0018] The unique "cooling + purging" dual cleaning design: the micropores and hydrophilic filter membrane on the surface of the upper pressure roller allow the cooling medium to seep out in small amounts and evenly, forming a thin wetting layer at the contact interface, which washes away some electrolyte crystals or impurities. At the same time, the directional pulsating airflow generated by the air bladder driven by the air blowing component blows the contact area, which can effectively remove droplets and deposits. The two work together to greatly improve the cleanliness of the contact area.

[0019] The air-blowing component of this invention cleverly utilizes the rotation of the upper pressure roller as a power source. Through the eccentric block-piston mechanism, the rotational motion is converted into reciprocating motion to generate airflow. No additional power is required, which is energy-saving and automatically matches the production line speed (i.e., the rotational speed of the upper pressure roller). The airflow frequency changes with the line speed, making it highly adaptable.

[0020] This invention improves washing efficiency and effectiveness through an independent spraying mechanism and optimized washing tank design. The inclusion of anti-deviation components and a sealing cover enhances the stability and environmental friendliness of the production process. The conductive plate employs a corrugated design, increasing the effective reaction area and improving the uniformity of the electric field distribution. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall rear structure of the present invention; Figure 3 This is a schematic diagram of the structure after the sealing cover has been removed; Figure 4 This is a schematic diagram of the structure of the second washing tank, the anodizing tank, and the third washing tank of the present invention; Figure 5 for Figure 4 Schematic diagram of the cross-sectional structure of the middle side; Figure 6 This is a schematic diagram of the structure of a single upper and lower clamping roller of the present invention; Figure 7 for Figure 6 Schematic diagram of the structure after the installation frame is removed; Figure 8 for Figure 7 Schematic diagram of a localized explosion structure; Figure 9 This is a schematic diagram of the airbag structure in this invention; Figure 10 This is a schematic diagram of the structure of the air-blowing component of the present invention; Figure 11 This is a schematic diagram of the spray mechanism of the present invention.

[0022] In the diagram: 1. Tank; 2. Pay-off roller; 3. Take-up roller; 4. Winding machine; 5. Drying box; 6. Anti-deviation assembly; 7. Mounting frame; 8. Upper pressure roller; 9. Lower pressure roller; 10. Adjustment mechanism; 11. Alkali washing tank; 12. First washing tank; 13. Stain removal tank; 14. Second washing tank; 15. Anodizing tank; 16. Third washing tank; 17. Sealing tank; 18. Fourth washing tank; 19. Sealing cover; 61. Base frame; 62. Frame body; 63. Drive motor; 64. Rotating roller; 65. Anti-deviation roller; 66. Photoelectric sensor; 67. Inlet roller; 68. Balance roller; 81. Rotating shaft sleeve; 82. Micropore; 83. Hydrophilic filter membrane; 91. Airbag sleeve; 92. Air blowing component; 00. Circulation pipe; 101. Mounting plate; 102. Hydraulic telescopic pipe; 103. Mounting sleeve; 104. Rotating roller; 105. Rotating area; 121. U-shaped pipe; 122. Mounting bracket; 123. Spray pipe; 124. Water storage pipe; 125. Bend; 151. Conductive plate; 191. Water inlet; 192. Drain hole; 921. Rotating body; 922. Eccentric block; 923. Track groove; 924. Extrusion block; 925. Piston rod; 926. Piston sleeve; 927. Receiving air pipe; 928. Hose; 929. Connecting horizontal pipe; 930. Air hole; 931. Electrically controlled valve; 932. Connecting sleeve; 933. Mounting groove; 934. Round hole; 935. Fixed connecting rod. Detailed Implementation

[0023] 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.

[0024] This invention provides a technical solution: an aluminum foil oxidation treatment device, comprising a long strip-shaped tank 1, the interior of which is divided into multiple independent treatment pools, arranged sequentially along the travel direction of the aluminum foil strip (not shown in the figure): alkaline washing pool 11, first water washing pool 12, stain removal pool 13, second water washing pool 14, anodizing pool 15, third water washing pool 16, sealing pool 17, and fourth water washing pool 18. Each pool has guide rollers at both ends. A feed end (left end) of the tank 1 is equipped with a feed roller 2 for carrying the aluminum foil roll to be treated, and a take-up roller 3 is installed at the discharge end (right end). The take-up roller 3 is connected to a winding machine 4 that drives its rotation to provide traction power for the aluminum foil strip. A drying box 5 is set between the tank 1 and the take-up roller 3 for drying the treated aluminum foil strip. To ensure that the aluminum foil strip does not deviate during travel, a set of anti-deviation components 6 is installed at the feed end and discharge end of the tank 1 respectively.

[0025] Mounting brackets 7 are fixedly installed at the top of both ends of the anodizing tank 15. Each mounting bracket 7 has one (or more as needed) upper pressing rollers 8 arranged side by side. A lower pressing roller 9 is arranged directly above the upper pressing roller 8. The lower pressing roller 9 is used to press the aluminum foil strip onto the upper pressing roller 8 to ensure good contact. An adjustment mechanism 10 is also installed on the mounting bracket 7 to precisely adjust the pressing force of the lower pressing roller 9 on the aluminum foil strip and the upper pressing roller 8.

[0026] To address the overheating issue during operation of the upper pressure roller 8, the upper pressure roller 8 is designed with a hollow cooling chamber. A set of circulation pipes 100 is laid outside the tank 1, through which a cooling medium (such as cold water or coolant) flows. The circulation pipes 100 are rotatably connected to the cooling chamber of the upper pressure roller 8 via a rotating bushing 81. The rotating bushing 81 ensures the delivery of the cooling medium without hindering the rotation of the upper pressure roller 8. The cooling medium continuously flows into the cooling chamber, effectively cooling the high-speed rotating upper pressure roller 8.

[0027] To further improve the cleanliness of the contact area and prevent electrolyte residue or crystals from affecting the contact, airbag sleeves 91 are rotatably fitted at both ends of the lower pressure roller 9. An inclined air blowing port is opened at the bottom of the airbag sleeve 91, which is directly facing the contact area between the upper pressure roller 8 and the aluminum foil strip. An air blowing component 92 is provided on the mounting frame 7 to supply air to the airbag sleeve 91. When the air blowing component 92 inflates the airbag sleeve 91, the airflow is sprayed out from the air blowing port to form an air curtain or air jet, which sweeps the surface of the contact area.

[0028] In a preferred embodiment, the upper pressing roller 8 has a large number of micropores 82 communicating with its internal cooling cavity on its roller surface. At the same time, the entire roller surface of the upper pressing roller 8 is covered with a hydrophilic filter membrane 83. The hydrophilic filter membrane 83 allows the cooling medium (such as water) to seep out evenly in a very fine manner, but can prevent solid particles in the electrolyte from entering the micropores 82 in the reverse direction. The seeping coolant forms a wetting layer at the contact interface, washes away the tiny impurities, and forms a synergistic cleaning effect with the airflow blowing from above.

[0029] One specific implementation of the air-blowing component 92 includes: a rotating body 921 fixedly mounted on one end of the upper pressure roller 8; an eccentric block 922 embedded in the rotating body 921; an annular track groove 923 on the rotating body 921; a pressing block 924 slidably disposed within the track groove 923, with one end in contact with the surface of the eccentric block 922; a piston rod 925 connected to the top of the pressing block 924; a piston sleeve 926 fixedly mounted on the mounting bracket 7; the upper end of the piston rod 925 extending into the piston sleeve 926 and capable of reciprocating sliding; and an air receiving pipe 927 connected to the top of the piston sleeve 926. 27 is connected to the airbag sleeve 91 through a hose 928. When the upper pressure roller 8 rotates, it drives the rotating body 921 and the eccentric block 922 inside it to rotate together. The rotation of the eccentric block 922 causes the extrusion block 924 to slide periodically in the track groove 923, thereby driving the piston rod 925 to perform reciprocating piston motion in the piston sleeve 926. The piston sleeve 926, the receiving air pipe 927 and the hose 928 form an air passage. The reciprocating motion of the piston rod 925 generates pulsating airflow in this air passage, which is delivered to the airbag sleeve 91 through the hose 928, so that the airflow supply is automatically synchronized with the production line speed without the need for an additional motor drive.

[0030] One embodiment of the adjusting mechanism 10 includes a mounting plate 101 fixedly mounted on a mounting frame 7. A hydraulic telescopic tube 102 (or other linear drive components such as cylinders or electric push rods) is mounted on the mounting plate 101. An mounting sleeve 103 is connected to the output end of the hydraulic telescopic tube 102. Rotating rollers 104 are mounted on both ends of the lower pressing roller 9 via bearings. The mounting sleeve 103 fits precisely on the rotating roller 104, thereby supporting and driving the lower pressing roller 9 to move up and down. A rotating area 105 is provided on the lower pressing roller 9 corresponding to the position where the airbag sleeve 91 is mounted. The airbag sleeve 91 is rotatably mounted in the rotating area 105 via bearings, so that the airbag sleeve 91 can rotate freely relative to the lower pressing roller 9, reducing friction.

[0031] To enhance the purging effect and flexibility, a connecting horizontal pipe 929 connects the two airbag sleeves 91. Multiple air holes 930 are distributed along the width of the aluminum foil strip on the connecting horizontal pipe 929. Each air hole 930 is equipped with an electrically controlled valve 931. By controlling the opening and closing of the electrically controlled valves 931 at different positions, the distribution of the purging airflow can be adjusted to adapt to aluminum foil strips of different widths or to focus on cleaning certain areas. A connecting sleeve 932 is also provided on the outer side of the airbag sleeve 91. The connecting sleeve 932 has an internal mounting groove 933 that mates with the mounting sleeve 103 of the adjustment mechanism 10. A round hole 934 is provided at the top of the connecting sleeve 932 for the rod of the hydraulic telescopic tube 102 to pass through. The connecting sleeve 932 and the airbag sleeve 91 are connected by multiple fixed connecting rods 935, thereby securely mounting the airbag sleeve 91 assembly onto the adjustment mechanism 10.

[0032] Within the anodic oxidation tank 15, conductive plates 151 are symmetrically distributed on both sides of the aluminum foil strip. The conductive plates 151 are preferably made of inert conductive materials such as titanium or platinum. The surface of the conductive plates facing the aluminum foil strip is processed into a wavy shape (or a sawtooth shape or an uneven shape). This design increases the effective reaction area, while also facilitating the flow of electrolyte and the escape of gas, and making the electric field distribution more uniform, which is beneficial for the formation of a uniform oxide film.

[0033] Anodizing is a surface treatment process for aluminum foil, and the specific steps are as follows: 1. An electrochemical reaction is established. When the aluminum foil strip passes through the anodic oxidation tank 15, it is connected to the circuit as the anode (positive electrode), and the conductive plate 151 is connected to the negative electrode of the DC power supply as the cathode (negative electrode). The plates are symmetrically distributed on both sides of the aluminum foil strip, and the electrolyte (usually an acidic solution or mixed solution such as sulfuric acid, oxalic acid, phosphoric acid, etc.) fills the anodic oxidation tank 15.

[0034] Oxide film formation mechanism, initial oxidation: at the moment of energization, an anodic reaction occurs on the surface of the aluminum foil (Al → Al³⁺ + 3e⁻), and aluminum atoms lose electrons to become aluminum ions. Film-forming reaction: Dissolved aluminum ions react with oxygen ions or hydroxide ions dissociated from water molecules in the electrolyte to form a dense aluminum oxide (Al2O3) barrier layer on the surface of the aluminum foil.

[0035] Porous layer formation: Under the action of an electric field, the barrier layer dissolves locally (due to the combined effect of chemical and electrochemical dissolution of alumina by the electrolyte), forming a honeycomb porous structure perpendicular to the substrate. Dissolution and growth reach a dynamic equilibrium, and the oxide film continues to grow into the aluminum substrate while thickening outward.

[0036] Regarding electrolyte concentration and stirring: The electrolyte concentration needs to be kept stable. The wave-shaped design of the conductive plate 151 and the possible fluid movement in the cell help to make the electrolyte composition uniform.

[0037] 3. Real-time status management: During the oxidation process, hydrogen microbubbles, electrolyte splashes, or a small amount of crystals may be generated at the interface.

[0038] The cooling and cleaning system of this device (liquid seepage through micropores 82 on the upper pressing roller 8 and blowing through airbag sleeve 91) acts on the contact area between the aluminum foil and the upper pressing roller 8 in real time, ensuring that the surface of the aluminum foil is cleaned when it enters and exits the oxidation tank. This is the key guarantee for obtaining a uniform oxide film.

[0039] The specific function of conductive plate 151 in the anodizing process is as follows: 1. Forming a complete current loop, serving as the negative electrode of the circuit, and creating an electric field with the aluminum foil serving as the anode, is an essential condition for the electrochemical reaction to proceed.

[0040] 2. Provide the main reaction site for the reduction reaction to occur on the surface of conductive plate 151: 2H⁺ + 2e⁻ → H₂↑ (in acidic electrolyte) or 2H₂O + 2e⁻ → H₂↑ + 2OH⁻ (under neutral or alkaline conditions).

[0041] This reaction consumes electrons, balancing the process of electron loss at the anode (aluminum foil) and maintaining the continuous flow of current.

[0042] 3. Optimize electric field distribution; the wavy surface design provides the following methods: Increased effective area: Compared with flat plates, corrugated surfaces have a larger actual surface area under the same projected area, which reduces the current density of the cathode, reduces polarization, and makes the electric field distribution more uniform.

[0043] Guiding electric field lines: The wavy, uneven structure can "guide" and "disperse" the electric field lines, which helps to reduce the electric field concentration effect (edge ​​effect) at the edge of the aluminum foil, thereby making the oxide film thickness more uniform in the width direction of the aluminum foil.

[0044] Improved flow field: The wave structure breaks the laminar flow state of the electrolyte, promotes slight disturbance and exchange of the electrolyte in the cell, which is conducive to the escape of reaction products (such as hydrogen) and the uniformity of reactant concentration, and prevents local overheating or concentration depletion.

[0045] To improve washing efficiency, each of the first washing tank 12, the second washing tank 14, the third washing tank 16, and the fourth washing tank 18 is equipped with an independent spraying mechanism. Each spraying mechanism includes a rectangular loop pipe 121, which is fixed to the inner wall of the washing tank by mounting brackets 122. Multiple spray pipes 123 are connected downwards to the loop pipe 121, and each spray pipe 123 has a row of small water outlet holes. An independent water storage pipe 124 (a main pipe that can supply water to each washing tank independently) is provided outside the tank body 1. The water storage pipe 124 is connected to the loop pipe 121 in each washing tank through a bend 125 to provide high-pressure clean rinsing water. This multi-angle spraying design can thoroughly and efficiently rinse both sides of the aluminum foil strip that passes through at high speed.

[0046] To prevent the aluminum foil from shifting during movement, an anti-deviation component 6 is used for adjustment. The specific structure of the anti-deviation component 6 includes a base frame 61 fixed to the ground, a frame body 62 mounted on the base frame 61 via bearings, and the frame body 62 can swing within a certain angle around a vertical axis. A rotating roller 64 driven by a drive motor 63 is installed inside the frame body 62, and an anti-deviation roller 65 is fitted on the rotating roller 64. A photoelectric sensor 66 is installed on the top of the frame body 62 to detect the position of the aluminum foil strip edge in real time. When the aluminum foil strip is detected to be deviating, the control system will drive the motor 63 to rotate, and adjust the rotation speed of the rotating roller 64 by adjusting the rotation speed of the drive motor 63. Thus, the rotating roller 64 and the anti-deviation roller 65 work together to generate a lateral correction force on the aluminum foil strip, causing it to return to the correct path. An entry roller 67 is installed on the outside of the frame body 62, and balance rollers 68 are installed at both ends of the trough 1 to guide and stabilize the aluminum foil strip.

[0047] To control the liquid temperature and potential waste gas generated in each treatment tank, an openable and closable sealing cover 19 is installed at the top of each tank in tank 1. The circulation pipe 100 is not only used to cool the upper pressing roller 8, but also has an expandable function to connect independently to each treatment tank for liquid circulation or temperature control. Specifically, an inlet hole 191 communicating with the circulation pipe 100 is provided on the upper part of the tank wall of each tank, and a drain hole 192 communicating with the circulation pipe 100 is provided on the lower part of the tank wall of each tank. Typically, the diameter of the inlet hole 191 is larger than the diameter of the drain hole 192 to facilitate a gentle top-to-bottom circulation of the liquid in the tank and avoid disturbing the aluminum foil strip.

[0048] An aluminum foil oxidation process using an aluminum foil oxidation processing apparatus includes the following steps: S1: Feeding and threading: The aluminum foil roll to be processed is installed on the feed roller 2, and the aluminum foil strip is pulled through the processing pools and drying boxes 5 in the tank 1 and fixed to the take-up roller 3. S2: Pre-treatment: Start the winding machine 4, and the aluminum foil strip continuously passes through the alkaline washing tank 11 for degreasing. After rinsing in the first water washing tank 12, it enters the stain removal tank 13 for acid washing to remove surface oxides and residual impurities, and then is thoroughly rinsed in the second water washing tank 14. S3: Anodizing: The pretreated aluminum foil strip enters the anodizing tank 15 through the upper and lower pressing rollers, where an aluminum oxide film is generated in the electrolyte; The following steps are performed simultaneously during the anodizing process: S31: Contact pressure adjustment: The adjustment mechanism 10 controls the lower pressure roller 9 to apply stable pressure to the aluminum foil strip to ensure good contact between it and the upper pressure roller 8; S32: Contact area cooling and cleaning: The cooling medium flows into the cooling chamber of the upper pressing roller 8 through the circulation pipe 100 and the rotating shaft sleeve 81 to cool the roller body, and then seeps out through the roller surface micropores 82 and diffuses through the hydrophilic filter membrane 83 to moisten and clean the contact interface. S33: Interface purging: The air blowing component 92 is triggered when the upper pressure roller 8 rotates, supplying air to the airbag sleeve 91. The airflow is ejected from the air blowing port to purge any droplets, crystals or tiny impurities that may exist on the surface of the contact area between the upper pressure roller 8 and the aluminum foil strip. S4: Post-processing: After the oxidized aluminum foil strip is initially cleaned in the third washing tank 16, it enters the sealing tank 17 for sealing treatment, and then undergoes final rinsing in the fourth washing tank 18. S5: Drying and winding: The rinsed aluminum foil strip enters the drying box 5 for drying, and is finally wound into the finished product by the winding machine 4.

[0049] 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.

[0050] 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 variations 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. An aluminum foil oxidation treatment apparatus, comprising a tank (1), characterized in that: The tank (1) is provided with an alkaline washing tank (11), a first water washing tank (12), a stain removal tank (13), a second water washing tank (14), an anodizing tank (15), a third water washing tank (16), a sealing tank (17), and a fourth water washing tank (18) in sequence along the direction of aluminum foil strip travel. Each tank is provided with guide rollers at both ends. One end of the tank (1) is provided with a wire feeding roller (2) and the other end is provided with a wire taking roller (3). The wire taking roller (3) rotates through a winding machine (4). A drying box (5) is provided between the tank (1) and the wire taking roller (3). Anti-deviation components (6) for correcting aluminum foil strip deviation are provided at both ends of the tank (1). An mounting frame (7) is provided at the top of both ends of the anodizing pool (15). An upper pressing roller (8) is arranged side by side on the mounting frame (7). A lower pressing roller (9) is provided directly above the upper pressing roller (8) to press the aluminum foil strip. An adjustment mechanism (10) is provided on the mounting frame (7) to adjust the pressing force between the lower pressing roller (9) and the upper pressing roller (8). The upper pressing roller (8) has a hollow cooling chamber inside. The outside of the groove (1) is provided with a circulation pipe (100). The circulation pipe (100) is rotatably connected to the cooling chamber of the upper pressing roller (8) through a rotating bushing (81) for introducing cooling medium into the cooling chamber. The two ends of the lower pressing roller (9) are rotatably fitted with airbag sleeves (91). The bottom of the airbag sleeve (91) is provided with an air blowing port that is inclined towards the contact area between the upper pressing roller (8) and the aluminum foil strip. The mounting bracket (7) is provided with an air blowing component (92) that supplies air to the airbag sleeve (91).

2. The aluminum foil oxidation treatment apparatus according to claim 1, characterized in that: The upper pressing roller (8) has multiple micropores (82) on its roller surface that communicate with its internal cooling cavity, and the roller surface of the upper pressing roller (8) is covered with a hydrophilic filter membrane (83).

3. An aluminum foil oxidation treatment apparatus according to claim 1 or 2, characterized in that: The air-blowing component (92) includes a rotating body (921) installed at one end of the upper pressure roller (8). An eccentric block (922) is provided inside the rotating body (921). A track groove (923) is opened on the rotating body (921). An extrusion block (924) is slidably arranged in the track groove (923). The extrusion block (924) is in contact with the eccentric block (922). A piston rod (925) is connected to the top of the extrusion block (924). A piston sleeve (926) is fixed on the mounting bracket (7), and one end of the piston rod (925) extends into the piston sleeve (926); The top of the piston sleeve (926) is connected to a receiving air tube (927), which is connected to the airbag sleeve (91) via a hose (928); When the upper pressing roller (8) rotates, it drives the rotating body (921) and the eccentric block (922) to rotate, and then drives the piston rod (925) to reciprocate in the piston sleeve (926) through the extrusion block (924), generating pulsating airflow.

4. The aluminum foil oxidation treatment apparatus according to claim 3, characterized in that: The adjustment mechanism (10) includes a mounting plate (101) fixedly mounted on the mounting frame (7), a hydraulic telescopic tube (102) mounted on the mounting plate (101), an mounting sleeve (103) provided at the output end of the hydraulic telescopic tube (102), rotating rollers (104) mounted at both ends of the lower pressing roller (9), and the mounting sleeve (103) sleeved on the rotating roller (104); a rotating area (105) is opened on the lower pressing roller (9), and the airbag sleeve (91) is rotatably mounted at the rotating area (105).

5. The aluminum foil oxidation treatment apparatus according to claim 4, characterized in that: A connecting horizontal tube (929) is connected between the two airbag sleeves (91). Multiple air holes (930) are distributed on the connecting horizontal tube (929), and an electric control valve (931) is provided at each air hole (930). A connecting sleeve (932) is provided on the outside of the airbag sleeve (91). The connecting sleeve (932) has an installation groove (933) that cooperates with the mounting sleeve (103) inside. A round hole (934) is opened at the top of the connecting sleeve (932) for the hydraulic telescopic tube (102) to pass through. Multiple fixed connecting rods (935) are connected between the connecting sleeve (932) and the airbag sleeve (91).

6. The aluminum foil oxidation treatment apparatus according to claim 1, characterized in that: The anodic oxidation pool (15) contains symmetrically distributed conductive plates (151) on both sides of the aluminum foil strip. The conductive plates (151) are connected to an external power supply, and their surfaces facing the aluminum foil strip are wavy.

7. The aluminum foil oxidation treatment apparatus according to claim 1, characterized in that: Each of the first washing pool (12), the second washing pool (14), the third washing pool (16), and the fourth washing pool (18) has an independent spraying mechanism. The spraying mechanism includes a loop pipe (121), which is connected to the inner wall of the washing pool by a mounting bracket (122). Multiple spray pipes (123) are distributed on the loop pipe (121), and multiple water outlet holes are provided on the spray pipes (123). The tank (1) is provided with an independent water storage pipe (124) outside. The water storage pipe (124) is connected to the loop pipe (121) through a bend pipe (125) and is used to supply water to the spraying mechanism.

8. The aluminum foil oxidation treatment apparatus according to claim 1, characterized in that: The anti-deviation assembly (6) includes a base frame (61), a frame body (62) is mounted on the base frame (61), a rotating roller (64) driven by a drive motor (63) is installed inside the frame body (62), and an anti-deviation roller (65) is sleeved on the rotating roller (64); a photoelectric sensor (66) for detecting the edge position of the aluminum foil strip is installed on the top of the frame body (62); an entry roller (67) is installed on the outside of the frame body (62), and balance rollers (68) are installed at both ends of the groove (1).

9. The aluminum foil oxidation treatment apparatus according to claim 1, characterized in that: Each pool in the tank (1) is equipped with a sealing cover (19) at the top of each pool; the circulation pipe (100) is independently connected to each pool, specifically: each pool has an inlet hole (191) connected to the circulation pipe (100) at the upper part of the pool wall, and each treatment pool has a drain hole (192) connected to the circulation pipe (100) at the lower part of the pool wall, and the diameter of the inlet hole (191) is larger than the diameter of the drain hole (192).

10. A method for aluminum foil oxidation treatment based on the aluminum foil oxidation treatment apparatus according to any one of claims 1-9, characterized in that, Includes the following steps: S1: Feeding and threading: The aluminum foil roll to be processed is installed on the feed roller (2), and the aluminum foil strip is pulled through the processing pools and drying box (5) in the tank (1) and fixed to the take-up roller (3). S2: Pretreatment: Start the winding machine (4), and the aluminum foil strip continuously passes through the alkaline washing tank (11) for degreasing. After rinsing in the first water washing tank (12), it enters the stain removal tank (13) for pickling to remove surface oxides and residual impurities, and then is thoroughly rinsed in the second water washing tank (14). S3: Anodizing: The pretreated aluminum foil strip enters the anodizing pool (15) through the upper pressing roller (8) and the lower pressing roller (9) to generate an aluminum oxide film in the electrolyte; The following steps are performed simultaneously during the anodizing process: S31: Contact pressure adjustment: The lower pressing roller (9) is controlled by the adjustment mechanism (10) to apply stable pressure to the aluminum foil strip to ensure good contact with the upper pressing roller (8); S32: Contact area cooling and cleaning: The cooling medium flows into the cooling chamber of the upper pressing roller (8) through the circulation pipe (100) and the rotating sleeve (81) to cool the roller body, and then seeps out through the roller surface micropores (82) and diffuses through the hydrophilic filter membrane (83) to wet and clean the contact interface. S33: Interface purging: The air blowing component (92) is triggered when the upper pressing roller (8) rotates, supplying air to the airbag sleeve (91), and the airflow is ejected from the air blowing port to purge any droplets, crystals or tiny impurities that may exist on the surface of the contact area between the upper pressing roller (8) and the aluminum foil strip. S4: Post-processing: After the oxidized aluminum foil strip is initially cleaned in the third washing tank (16), it enters the sealing tank (17) for sealing treatment, and then is finally rinsed in the fourth washing tank (18). S5: Drying and winding: The rinsed aluminum foil strip enters the drying box (5) for drying, and is finally wound into finished product by the winding machine (4).

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