Aluminum coil continuous oxidation production line and process method

Abstract

The invention discloses an aluminum roll continuous oxidation production line which comprises an unwinding machine, a continuous oxidation assembly, an air dryer, a film laminating machine and a winding machine which are sequentially arranged, and the continuous oxidation assembly comprises six reaction devices and six cleaning devices which are sequentially and alternately arranged. The six reaction devices are a degreasing device, an alkali washing device, a neutralizing device, an anodic oxidation device, a dyeing device and a sealing device in sequence along the working procedure sequence, each reaction device comprises a reaction tank, a guide roller, an upper spraying structure and a lower stirring structure, an adding structure is arranged in the alkali washing device, reaction liquid is automatically added according to the concentration of the solution in the reaction tank, and the stirring structure is arranged in the reaction tank. Through the design of an upper spraying structure and a lower stirring structure, the double surfaces of the aluminum coil can be ensured to be in uniform contact with reaction liquid in each reaction tank; an adding structure is arranged in the alkali washing device, reaction liquid can be automatically added, the concentration consistency of the reaction liquid is ensured, and therefore the aluminum roll oxidation process is continuous, the roll-to-roll operation of aluminum rolls is improved, and the production efficiency and the cost effectiveness are ensured.

Description

Technical Field

[0001] The present application relates to the technical field of aluminum coil production, and in particular to an aluminum coil continuous oxidation production line and process method. Background Art

[0002] In the surface treatment process of aluminum coils, oxidation treatment is an important process. By forming a dense oxide film on the surface of the aluminum coil, the corrosion resistance and aesthetics of the aluminum coil can be significantly improved.

[0003] Traditional aluminum coil oxidation production lines usually include multiple reaction steps, such as degreasing, alkali washing, neutralization, anodizing, dyeing and sealing, etc. Each step needs to be carried out in a specific reaction liquid. The aluminum coil passes through these reaction liquids in turn to complete the surface treatment.

[0004] However, when aluminum coils are continuously oxidized, the quality control of the aluminum coils is difficult, and the oxide layer of the aluminum coils is usually uneven. Therefore, the roll-to-roll operation method (that is, the aluminum coils are unwound by the unwinder, and after multiple oxidation operations, they are rewound by the rewinder) is not often used, which affects the production efficiency and cost-effectiveness of the entire production line. Summary of the invention

[0005] The present application aims to solve one of the technical problems in the above-mentioned technology at least to some extent.

[0006] To achieve the above-mentioned purpose, the first aspect of the present application proposes a continuous oxidation production line for aluminum coils, comprising an unwinder, a continuous oxidation assembly, an air dryer, a laminating machine and a rewinder arranged in sequence, wherein the continuous oxidation assembly comprises six reaction devices and six cleaning devices arranged alternately in sequence, and the six reaction devices are a degreasing device, an alkali washing device, a neutralization device, an anodizing device, a dyeing device and a sealing device in order of process steps, each of the reaction devices comprises a reaction tank, a guide roller, an upper spray structure and a lower stirring structure, wherein the reaction tank is filled with a corresponding reaction liquid; the guide roller is rotatably arranged in the reaction tank, and the aluminum coil enters from one side of the top of the reaction tank, and is guided by the guide roller and then led out from the other side of the reaction tank; the upper spray structure and the lower stirring structure are respectively arranged on the upper and lower sides of the aluminum coil, and the guide roller is connected to the driving end of the lower stirring device through a transmission structure; wherein an adding structure is arranged in the alkali washing device to automatically add the reaction liquid according to the concentration of the solution in the reaction tank.

[0007] In addition, the aluminum coil continuous oxidation production line proposed in the present application may also have the following additional technical features:

[0008] As a further description of the above technical solution: the adding structure includes a float, a rotating rod, a trigger head, a contact switch and an adding tank, wherein the rotating rod can be rotatably arranged in the reaction tank; the float is arranged at one end of the rotating rod, and the trigger head is arranged at the other end of the rotating rod; the contact switch is arranged below the trigger head and is electrically connected to the valve switch of the adding tank; wherein, when the concentration of the reaction liquid in the alkali washing device decreases, the float sinks, and the trigger head rises and separates from the contact switch to control the valve switch of the adding tank to open.

[0009] In order to achieve the above-mentioned purpose, the second aspect of the present application proposes a process method for continuous oxidation of aluminum coils, including, S100, unwinding the aluminum coil; S200, degreasing and washing with water; S300, alkali washing and washing with water; wherein, S301, preparing an alkali washing solution; an alkali washing device is provided with an alkali washing agent having a flake caustic soda concentration of 15% and a sodium gluconate concentration of 5%, and the alkali washing agent is heated to 50-90°C by steam heating; S302, uniform alkali washing; the aluminum coil continues to move after passing through the guide roller of the alkali washing device, and the alkali washing time is maintained for 2 minutes; during the alkali washing process, the upper spray in the alkali washing device The shower structure and the lower stirring structure respectively perform uniform alkali washing on the front and back sides of the aluminum coil; S303, automatically adding alkali washing liquid; the adding structure automatically adds alkali washing agent according to the change of alkali washing agent concentration; S304, water washing; the cleaning device uses countercurrent rinsing to clean the aluminum coil; S305, wastewater treatment; the alkali washing wastewater enters the supporting sewage treatment station through a pipeline for treatment; S400, neutralization and water washing; S500, anodizing and water washing; S600, dyeing and water washing; S700, sealing and water washing; S800, air drying and laminating; S900, winding the aluminum coil.

[0010] As a further description of the above technical solution: the unwinding machine unwinds the aluminum coil, including S101, using the unwinding machine to unwind the aluminum coil; S102, using pneumatic pressure inlet scissors to neatly cut the ends of the aluminum coil; S103, using a die-punching stitching machine to connect the new aluminum coil with the end of the aluminum coil that is about to be exhausted; S104, using a tension roller to support the aluminum coil to transfer the aluminum coil to the degreasing process.

[0011] As a further description of the above technical solution: the degreasing and water washing include, S201, a degreasing agent with a concentration of 5% to 15% is configured in the degreasing device, and the degreasing agent is heated to 60°C-85°C by steam heating; S202, the aluminum coil passes through the guide roller in the degreasing device and moves continuously, and the degreasing time is maintained for 1 minute; S203, during the degreasing process, the upper spray structure and the lower stirring structure in the degreasing device respectively degrease the front and back sides of the aluminum coil evenly; S204, after the degreasing is completed, the cleaning device cleans the aluminum coil by countercurrent rinsing.

[0012] As a further description of the above technical solution: the neutralization and water washing include, S301, a neutralizing agent with a nitric acid concentration of 2%, a sulfuric acid concentration of 20%, and a hydrogen peroxide concentration of 5% is configured in the neutralization device; S302, the aluminum coil passes through the guide roller in the neutralization device and keeps moving, and the neutralization time at room temperature is maintained for 1 minute; S303, during the neutralization process, the upper spray structure and the lower stirring structure in the neutralization device respectively neutralize the front and back sides of the aluminum coil evenly; S304, after the neutralization is completed, the cleaning device immerses the aluminum coil in a countercurrent rinsing method for 1 minute; S305, the neutralization wastewater enters the supporting sewage treatment facility through a pipeline for centralized treatment.

[0013] As a further description of the above technical solution: the anodizing and water washing include, S501, the anodizing treatment device is configured with a reaction solution with an aluminum ion concentration not higher than 15g / L and a sulfuric acid concentration of 17%-23%, and the temperature is controlled at 20℃±2℃; S502, the aluminum coil continues to move after passing through the guide roller in the anodizing treatment device, and the oxidation time is maintained for about 4 minutes; S503, during the oxidation process, the upper spray structure and the lower stirring structure in the anodizing treatment device respectively uniformly oxidize the front and back sides of the aluminum coil; S504, after the oxidation is completed, the cleaning device adopts a countercurrent rinsing method for continuous cleaning for 2 minutes.

[0014] As a further description of the above technical solution: the dyeing and water washing include, S601, a reaction solution with a dye concentration of 8g / L-12g / L and a colorant concentration of 5g / L-20g / L is configured in the dyeing device; S602, the aluminum coil continues to move after passing through the guide roller in the dyeing device, and the dyeing is continued for 1.5 minutes; S603, during the dyeing process, the upper spray structure and the lower stirring structure in the dyeing device respectively uniformly dye the front and back sides of the aluminum coil; S604, after the dyeing is completed, the cleaning device cleans the aluminum coil with clean water.

[0015] As a further description of the above technical solution: the sealing and water washing include, S701, a sealing agent with a concentration of 5g / L-8g / L is configured in the sealing device, and the sealing agent is heated to 60℃-85℃ by steam heating; S702, the aluminum coil continues to move after passing through the guide roller in the sealing device, and is continuously sealed for 2 minutes; S703, during the sealing process, the upper spray structure and the lower stirring structure in the sealing device respectively evenly seal the front and back sides of the aluminum coil; S704, after the sealing is completed, the cleaning device cleans the aluminum coil with clean water for 20 seconds, and then uses hot water at 60℃-90℃ to continuously clean it again for 20 seconds.

[0016] As a further description of the above technical solution: the air drying and coating includes, S801, each production line is equipped with four wind knife-type air dryers facing each other to air dry the aluminum coil; S802, using continuous double-roll extrusion rollers to perform secondary drying on the surface of the aluminum coil; S803, using a coating machine to coat the aluminum coil.

[0017] According to the aluminum coil continuous oxidation production line of the present application, through the design of the upper spray structure and the lower stirring structure, it can ensure that the aluminum coil in each reaction tank is in uniform contact with the reaction liquid on both sides, avoiding the problem of uneven oxidation layer caused by single-sided treatment; an adding structure is provided in the alkali washing device, which can automatically add reaction liquid according to the concentration of the reaction liquid in the reaction tank, ensuring that the concentration of the reaction liquid is always in an optimal state, thereby improving the reaction effect and product quality, thereby making the aluminum coil oxidation process continuous, improving the roll-to-roll operation of aluminum coil oxidation, and ensuring production efficiency and cost-effectiveness.

[0018] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0020] Figure 1 is a schematic structural diagram of an aluminum coil continuous oxidation production line according to an embodiment of the present application;

[0021] Figure 2 is a schematic structural diagram of an alkali washing device according to an embodiment of the present application;

[0022] Figure 3 is a schematic diagram of the internal structure of an alkali washing device according to an embodiment of the present application;

[0023] Figure 4 is a schematic diagram of an adding structure according to an embodiment of the present application;

[0024] Figure 5 is a schematic diagram of a connection structure of a laminating machine and a winding machine according to an embodiment of the present application;

[0025] Figure 6 This is a schematic diagram of a process flow of a continuous oxidation process of an aluminum coil according to an embodiment of the present application;

[0026] As shown in the figure:

[0027] 100, unwinding machine; 200, reaction device; 201, reaction tank; 2011, transmission structure; 202, guide roller; 203, upper spray structure; 204, lower stirring structure; 205, adding structure; 2051, float; 2052, rotating rod; 2053, trigger head; 2054, contact switch; 2055, adding tank; 2056, slide; 210, degreasing device; 220, alkali washing device; 230, neutralizing device; 240, anodizing device; 250, dyeing device; 260, closing device; 300, cleaning device; 400, air drying machine; 500, laminating machine; 600, winding machine. DETAILED DESCRIPTION

[0028] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0029] The following describes the aluminum coil continuous oxidation production line according to an embodiment of the present application in conjunction with the accompanying drawings.

[0030] like Figures 1 to 5 As shown, the aluminum coil continuous oxidation production line of the embodiment of the present application includes an unwinder 100, a continuous oxidation component, an air dryer 400, a laminating machine 500 and a reel 600 arranged in sequence, wherein the continuous oxidation component includes six reaction devices 200 and six cleaning devices 300 arranged alternately in sequence, and the six reaction devices 200 are a degreasing device 210, an alkali washing device 220, a neutralization device 230, an anodizing device 240, a dyeing device 250 and a closing device 260 in order of process, and each reaction device 200 includes a reaction tank 201, a guide roller 202, an upper spray structure 203 and a lower stirring structure 204.

[0031] As a possible situation, the upper spraying structure includes a water pump and a spraying pipe. The water pump draws the reaction liquid in the reaction tank 201 to the spraying pipe, and sprays the reaction liquid from the spraying pipe to the surface of the aluminum coil.

[0032] As a possible scenario, the lower stirring structure includes a rotatable paddle, which is rotatably disposed in the reaction tank 201 below the aluminum coil and driven by a motor or other driving unit to rotate the paddle, thereby stirring the reaction liquid in the reaction tank 201, so that the reaction liquid reacts more evenly with the surface of the aluminum coil.

[0033] Among them, the reaction tank 201 is filled with corresponding reaction liquid, the guide roller 202 is rotatably arranged in the reaction tank 201, the aluminum coil enters from one side of the top of the reaction tank 201, and is guided by the guide roller 202 and then led out from the other side of the reaction tank 201. The upper spray structure 203 and the lower stirring structure 204 are respectively arranged on the upper and lower sides of the aluminum coil, and the guide roller 202 is connected to the driving end of the lower stirring device 204 through the transmission structure 2011.

[0034] An adding structure 205 is provided in the alkaline cleaning device 220 to automatically add reaction solution according to the concentration of the solution in the reaction tank 201 .

[0035] It should be noted that the alkaline washing liquid in the alkaline washing device 220 is a sodium hydroxide solution. The natural oxide film of the aluminum coil reacts with sodium hydroxide to generate sodium aluminate and water. The chemical reaction equation is as follows: A12O3+2NaOH=2NaA1O2+H2O. Since the natural oxide film on the aluminum surface is very thin, the reaction is completed quickly and accompanied by gas precipitation. The chemical reaction equation is as follows: 2Al+2NaOH+2H2O=2NaA1O2+3H2↑. In the aqueous solution of strong alkali, sodium aluminate will also undergo the following reaction:

[0036] The above reaction will increase the concentration of sodium aluminate, thereby inhibiting the production of hydrolysis product aluminum hydroxide. Therefore, the concentration of sodium hydroxide must be continuously increased when the concentration of sodium aluminate continues to increase.

[0037] Specifically, when the relevant staff continuously oxidizes the aluminum coil, the aluminum coil is first unwound from the unwinder 100, and passes through the alternately arranged degreasing device 210, cleaning device, alkali cleaning device 220, cleaning device, neutralization device 230, cleaning device, anodizing device, cleaning device, dyeing device 250, cleaning device, sealing device 260 and cleaning device in sequence, and then air-dried by the air-drying device, and then coated by the laminating machine 500 and reeled by the reel 600, so as to realize the roll-to-roll continuous oxidation operation of the aluminum coil.

[0038] When the aluminum coil passes through the degreasing device 210, the alkali washing device 220, the neutralizing device 230, the anodizing device, the dyeing device 250 and the sealing device 260, the reaction liquid in the corresponding reaction tank 201 reacts to the aluminum coil, and the upper spray structure 203 and the lower stirring structure in the corresponding reaction tank 201 react to both sides of the aluminum coil respectively.

[0039] Among them, when the aluminum coil enters the alkali cleaning device 220, as the concentration of sodium aluminate in the alkali cleaning component increases, the density of the overall solution decreases, and the adding device automatically adds reaction liquid (i.e., sodium hydroxide solution) to ensure that the aluminum coil always maintains the optimal reaction liquid concentration when entering the alkali cleaning device 220, thereby ensuring the consistency of the aluminum coil during the reaction, thereby ensuring the uniformity of the aluminum coil surface.

[0040] To clarify the above embodiment, in one embodiment of the present application, Figure 4 As shown, the adding structure 205 includes a float 2051 , a rotating rod 2052 , a trigger head 2053 , a contact switch 2054 and an adding tank 2055 .

[0041] The rotating rod 2052 is rotatably disposed in the reaction tank 201 , the floating ball 2051 is disposed at one end of the rotating rod 2052 , and the trigger head 2053 is disposed at the other end of the rotating rod 2052 .

[0042] As a possible situation, a slide groove 2056 is provided in the alkaline washing device 220, and the slide groove 2056 is arranged on the moving range of the floating end of the float 2051. Through the setting of the slide groove 2056, the reaction liquid fluctuation in the alkaline washing device 220 can be prevented from causing the float 2051 to become unstable.

[0043] The contact switch 2054 is disposed below the trigger head 2053 and is electrically connected to the valve switch of the adding tank 2055 .

[0044] When the concentration of the reaction liquid in the alkaline washing device 220 decreases, the float 2051 sinks, and the trigger head 2053 rises and separates from the contact switch 2054 to control the valve switch of the adding tank 2055 to open.

[0045] Specifically, when the concentration of sodium hydroxide in the alkali washing device 220 is normal, the buoyancy of the float 2051 is greater due to the higher density of the overall concentration, and the float 2051 is in a floating state. The float 2051 drives the rotating rod 2052 to rotate, and the rotating rod 2052 drives the trigger head 2053 downward to trigger the closing switch, and the control valve in the adding tank 2055 is closed.

[0046] As the aluminum coil reacts in the alkali washing device 220, the sodium aluminate solution in the alkali washing device 220 increases and the sodium hydroxide concentration decreases, thereby reducing the overall concentration of the reaction solution, thereby reducing the buoyancy of the float 2051. The float 2051 begins to sink and drives the rotating rod 2052 to rotate, so that the rotating rod 2052 drives the trigger head 2053 upward and separates the trigger head 2053 from the contact switch 2054. The control valve in the adding tank 2055 is opened, and the sodium hydroxide solution in the adding tank 2055 is injected into the reaction tank 201 to increase the overall concentration of the reaction solution.

[0047] like Figures 1 to 6 As shown, a process method for continuous oxidation of an aluminum coil according to an embodiment of the present application includes, S100, unwinding the aluminum coil.

[0048] In one embodiment of the present application, the unwinding machine 100 unwinds the aluminum coil, including S101, unwinding the aluminum coil using the unwinding machine 100; S102, neatly shearing the end of the aluminum coil using a pneumatic pressure-type inlet scissors; S103, connecting the new aluminum coil with the end of the aluminum coil that is about to be exhausted using a die-punching stitching machine;

[0049] S104, using a tension roller to support the aluminum coil to transfer the aluminum coil to the degreasing process.

[0050] As a possible situation, the unwinding machine 100 can use an expansion-contraction unwinding machine with a load-bearing capacity of 3-18 tons to unwind the aluminum coil.

[0051] It should be noted that after the aluminum coil is unwound from the unwinding machine 100, the end of the aluminum coil is neatly sheared by a pneumatic pressure-type inlet scissors, so that the end of the unwound aluminum coil is neat, so as to facilitate connection with the aluminum coil that is about to be used up. When unwinding, the aluminum coil is supported by a tension roller to transport the aluminum coil.

[0052] S200, degreased and washed.

[0053] In one embodiment of the present application, degreasing and water washing include, S201, configuring a degreasing agent with a concentration of 5% to 15% in the degreasing device 210, and heating the degreasing agent to 60° C.-85° C. by steam heating.

[0054] It should be noted that the reaction tank 201 of the degreasing device 210 has a size of 6m long × 2.2m wide × 0.83m high. When the reaction liquid is poured into the reaction tank 201, the reaction liquid occupies 90% of the volume of the reaction tank 201, and half of the tank is replaced every month during use.

[0055] S202, the aluminum coil passes through the guide roller 202 in the degreasing device 210 and moves continuously, and the degreasing time is maintained for 1 minute.

[0056] When necessary, the degreasing agent may be a solution of sulfuric acid, phosphoric acid or nitric acid to remove grease and other substances on the surface of the aluminum coil.

[0057] S203, during the degreasing process, the upper spraying structure 203 and the lower stirring structure 204 in the degreasing device 210 respectively degrease the front and back surfaces of the aluminum coil evenly.

[0058] S204, after degreasing is completed, the cleaning device 300 cleans the aluminum coil by countercurrent rinsing.

[0059] It should be noted that countercurrent rinsing means that the flow direction of the cleaning liquid is opposite to the movement direction of the aluminum coil. Specifically, when the aluminum coil moves forward on the continuous production line, the cleaning liquid flows in from the opposite direction, forming a countercurrent effect to remove chemical residues and impurities on the surface of the aluminum coil and ensure the quality of the oxide film.

[0060] S300, alkali washing and water washing;

[0061] Among them, alkali washing and water washing include S301, preparing alkali washing solution.

[0062] It should be noted that the alkaline cleaning device 220 is equipped with an alkaline cleaning agent having a flake caustic soda concentration of 15% and a sodium gluconate concentration of 5%, and the alkaline cleaning agent is heated to 50-90° C. by steam heating.

[0063] As a possible situation, the dimensions of the reaction tank 201 in the alkaline washing device 220 are 12 m long×2.2 m wide×0.83 m high, the reaction liquid accounts for 90% of the area of ​​the reaction tank body 201, and half of the tank is replaced every month during use.

[0064] S302, uniform alkali washing.

[0065] It should be noted that the aluminum coil continues to move after passing through the guide roller 202 of the alkali cleaning device 220, and the alkali cleaning time is maintained for 2 minutes; during the alkali cleaning process, the upper spray structure 203 and the lower stirring structure 204 in the alkali cleaning device 220 respectively perform uniform alkali cleaning on the front and back sides of the aluminum coil.

[0066] S303, automatically adding alkaline washing liquid.

[0067] It should be noted that when the concentration of the reaction solution in the alkali cleaning device 220 changes, the adding structure 205 automatically adds the alkali cleaning agent according to the change in the concentration of the alkali cleaning agent.

[0068] S304, water washing.

[0069] It should be noted that the cleaning device 300 uses a countercurrent rinsing method to clean the aluminum coil. The size of the water washing tank of the cleaning device is 2m long×2.2m wide×1.32m high, and the tank liquid is discharged in an overflow manner.

[0070] S305, wastewater treatment.

[0071] It should be noted that the tank liquid is replaced regularly, and the alkaline corrosion wastewater generated after the replacement is piped into the supporting sewage treatment station for treatment.

[0072] S400, neutralized and washed.

[0073] In one embodiment of the present application, neutralization and water washing include, S401, configuring a neutralizing agent with a nitric acid concentration of 2%, a sulfuric acid concentration of 20%, and a hydrogen peroxide concentration of 5% in the neutralization device 230 to neutralize the residual liquid on the surface of the aluminum coil.

[0074] S402, the aluminum coil passes through the guide roller 202 in the neutralization device 230 and keeps moving, and the neutralization time at room temperature is maintained for 1 minute.

[0075] It should be noted that nitric acid, sulfuric acid and hydrogen peroxide are regularly added into the reaction tank 201 and are circulated and not discharged.

[0076] S403, during the neutralization process, the upper spray structure 203 and the lower stirring structure 204 in the neutralization device 230 uniformly neutralize the front and back surfaces of the aluminum coil respectively.

[0077] S404, after neutralization, the cleaning device 300 immerses the aluminum coil in a countercurrent rinsing manner for 1 minute, and tap water is used for washing without heating.

[0078] S405, the neutralized wastewater enters the supporting sewage treatment facilities through pipes for centralized treatment.

[0079] S500, anodized and washed.

[0080] It should be noted that this process mainly produces an anti-corrosion oxide film on the surface of aluminum through electrolysis. The principle is to use aluminum coil as anode and aluminum plate as cathode material (the aluminum plate only conducts electricity and releases hydrogen and is basically not consumed), place it in an electrolyte solution (reaction solution), and use electrolysis to form an aluminum oxide film on its surface.

[0081] Direct current sulfuric acid anodizing is the most widely used method because it is suitable for oxidation polishing of aluminum and most aluminum alloys. The film is thicker, harder and more wear-resistant, and can achieve better corrosion resistance after sealing. The film is colorless and transparent, has strong adsorption capacity and is very easy to dye. The processing voltage is low and power consumption is low.

[0082] In one embodiment of the present application, anodizing and water washing include, S501, the anodizing treatment device 240 is configured with a reaction solution with an aluminum ion concentration not higher than 15g / L and a sulfuric acid concentration of 17%-23%, and the temperature is controlled at 20°C±2°C.

[0083] S502, the aluminum coil continues to move after passing through the guide roller 202 in the anodizing treatment device 240, and the oxidation time is maintained for about 4 minutes.

[0084] S503, during the oxidation process, the upper spray structure 203 and the lower stirring structure 204 in the anodizing treatment device 240 uniformly oxidize the front and back surfaces of the aluminum coil respectively;

[0085] S504, after the oxidation is completed, the cleaning device 300 uses a countercurrent rinsing method to continue cleaning for 2 minutes.

[0086] As a possible situation, the anodizing device includes two reaction tanks 201, namely a conductive tank and an oxidation tank, wherein the dimensions of the conductive tank are 6m long × 2.2m wide × 0.83m high, and the dimensions of the oxidation tank are 28m long × 2.2m wide × 0.83m high, and the aluminum coil passes through the conductive tank and the oxidation tank continuously.

[0087] It should be noted that a series of reactions occur during the anodic oxidation process: At the cathode, H2 is released according to the following reaction: 2H+2e→H2.

[0088] At the anode, 4OH-4e→2H2O+O2, the oxygen released is not only molecular oxygen O2, but also atomic oxygen O and ionic oxygen O2-, which is usually represented by molecular oxygen in the reaction.

[0089] The aluminum serving as the anode is oxidized by the oxygen released therefrom to form an anhydrous Al2O3 film: 4Al+3O2=2Al2O3. In addition to serving as an electrolyte, sulfuric acid also participates in the film-forming process: Al2O3+SO42-+H2O→﹝Al2O3〕x﹝SO4〕y·H2O.

[0090] According to "Aluminum Alloy Anodizing and Surface Treatment Technology" (written by Zhu Zufang, January 2010, second edition), during the sulfuric acid oxidation polishing process, the amount of sulfuric acid participating in the film-forming reaction is about 5kg / (t aluminum material).

[0091] The production line uses a trough surface gas collection pipeline to collect waste gas, which is then treated by alkali solution spraying and then discharged from a 20m exhaust chimney. The total collection efficiency of the project's waste gas can reach more than 95%; 5% of the uncollected waste gas escapes in the workshop and finally escapes into the atmosphere through doors and windows.

[0092] The acid preparation area for anodizing, degreasing, etc. is carried out on one side of the production line to facilitate the absorption of acid mist. At the same time, a gas collecting device is set in the preparation area to collect the acid mist generated. Since the preparation time is short and relatively concentrated, a soft curtain is set under the gas collecting device in the preparation area, which is closed on three sides to increase the collection efficiency of organized waste gas and ensure that the collection efficiency is not less than 95%.

[0093] S600, dyed and washed.

[0094] It should be noted that the oxidized polished film has high porosity, strong adsorption capacity, and is easy to dye. The dyeing method is to immediately immerse the aluminum coil that has just been oxidized and polished in a solution containing dyes after washing. The pores of the oxidized film are dyed with various colors due to the adsorption of dyes. This method is fast, bright, and easy to operate; after dyeing, the pores are sealed, and the dye can be firmly attached to the pores of the film, which improves the corrosion resistance and anti-fouling ability of the film layer and can maintain beautiful color. For this reason, the dyeing method has been rapidly developed and widely used. The anodized film obtained by aluminum in sulfuric acid solution is colorless and porous, so it is most suitable for dyeing.

[0095] In one embodiment of the present application, dyeing and washing include, S601, configuring a reaction solution with a dye concentration of 8g / L-12g / L and a colorant concentration of 5g / L-20g / L in the dyeing device 250.

[0096] As a possible situation, the dimensions of the reaction tank 201 in the dyeing device 250 are 9m long×2.2m wide×0.83m high, and the reaction liquid occupies 90% of the volume of the reaction tank 201. When in use, half of the tank is replaced every 2 months to half a year.

[0097] S602, the aluminum coil continues to move after passing through the guide roller 202 in the dyeing device 250, and the dyeing continues for 1.5 minutes.

[0098] S603, during the dyeing process, the upper spray structure 203 and the lower stirring structure 204 in the dyeing device 250 uniformly dye the front and back sides of the aluminum coil respectively.

[0099] S604, after dyeing is completed, the cleaning device 300 cleans the aluminum coil with clean water.

[0100] S700, sealing and washing.

[0101] It should be noted that for unsealed anodized films, due to the large number of micropores, the effective area of ​​the workpiece exposed to the environment increases by dozens to hundreds of times, and the corresponding corrosion rate also increases greatly. Therefore, sealing treatment is necessary to improve corrosion resistance and pollution resistance.

[0102] In one embodiment of the present application, sealing and water washing include, S701, configuring a sealing agent with a concentration of 5g / L-8g / L in the sealing device 260, and heating the sealing agent to 60°C-85°C by steam heating.

[0103] It should be noted that the main function of the sealant is to seal the tiny pores on the surface of the aluminum coil, making the aluminum material corrosion-resistant. The dimensions of the reaction tank 201 in the sealing device 260 are 12m long × 2.2m wide × 0.83m high. The reaction liquid accounts for 90% of the volume of the reaction tank 201. When in use, half of the tank is replaced every 1 month to half a year.

[0104] S702, the aluminum coil continues to move after passing through the guide roller 202 in the closing device 260, and the closing is continued for 2 minutes.

[0105] S703, during the sealing process, the upper spray structure 203 and the lower stirring structure 204 in the sealing device 260 respectively evenly seal the front and back sides of the aluminum coil.

[0106] S704, after the sealing is completed, the cleaning device 300 cleans the aluminum coil with clean water for 20 seconds, and then uses hot water at 60°C-90°C to clean it again for 20 seconds continuously.

[0107] It should be noted that the reaction liquid in the closed device 260 is added regularly and recycled without being discharged, and the overflow of the water washing tank is discharged.

[0108] S800, air dry and laminate.

[0109] In one embodiment of the present application, air drying and coating includes S801, where each production line is equipped with four air knife-type air dryers 400 that are opposite to each other in pairs to air dry the aluminum coil.

[0110] It should be noted that after the sealed aluminum coil is air-dried, since the thickness of the aluminum coil itself is relatively thin, there is less liquid on the surface of the aluminum coil, and it is easy to air-dry.

[0111] S802 uses continuous double-roll extrusion rollers to perform secondary drying on the surface of the aluminum coil.

[0112] It should be noted that most of the liquid can be filtered out during the rolling process. The surface of the aluminum coil after water washing has less water content. After air drying and extrusion, the surface of the aluminum coil can be kept dry.

[0113] S803, use the laminating machine 500 to perform laminating operation on the aluminum coil.

[0114] S900, coiling aluminum coil.

[0115] It should be noted that after air drying and laminating operations, the aluminum coil can be directly rolled up by the winder 600.

[0116] In summary, according to the continuous oxidation production line of the aluminum coil of the embodiment of the present application, through the design of the upper spray structure 203 and the lower stirring structure 204, it can ensure that the aluminum coil is in uniform contact with the reaction liquid on both sides in each reaction tank 201, thereby avoiding the problem of uneven oxidation layer caused by single-sided treatment; an adding structure 205 is provided in the alkali washing device 220, which can automatically add reaction liquid according to the concentration of the reaction liquid in the reaction tank 201, ensuring that the concentration of the reaction liquid is always in an optimal state, thereby improving the reaction effect and product quality, thereby making the oxidation process of the aluminum coil continuous, improving the roll-to-roll operation of the aluminum coil oxidation, and ensuring production efficiency and cost-effectiveness.

[0117] In the description of this specification, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0118] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0119] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A continuous oxidation production line for aluminum coils, characterized in that: The invention comprises an unwinding machine (100), a continuous oxidation assembly, an air dryer (400), a laminating machine (500) and a winding machine (600) which are arranged in sequence, wherein the continuous oxidation assembly comprises six reaction devices (200) and six cleaning devices (300) which are arranged alternately in sequence, and the six reaction devices (200) are a degreasing device (210), an alkali cleaning device (220), a neutralizing device (230), an anodizing device (240), a dyeing device (250) and a sealing device (260) in sequence of processes, and each of the reaction devices (200) comprises a reaction tank (201), a guide roller (202), an upper spraying structure (203) and a lower stirring structure (204), wherein: The reaction tank (201) is filled with a corresponding reaction liquid; The guide roller (202) is rotatably arranged in the reaction tank (201), and the aluminum coil enters from one side of the top of the reaction tank (201), and is guided by the guide roller (202) and then led out from the other side of the reaction tank (201); The upper spray structure (203) and the lower stirring structure (204) are respectively arranged on the upper and lower sides of the aluminum coil, and the guide roller (202) is connected to the driving end of the lower stirring structure (204) via a transmission structure (2011); Wherein, the alkaline washing device (220) is provided with an adding structure (205) for automatically adding reaction liquid according to the concentration of the solution in the reaction tank (201).

2. The aluminum coil continuous oxidation production line according to claim 1, characterized in that: The adding structure (205) includes a floating ball (2051), a rotating rod (2052), a trigger head (2053), a contact switch (2054) and an adding tank (2055), wherein: The rotating rod (2052) is rotatably disposed in the reaction tank (201); The floating ball (2051) is arranged at one end of the rotating rod (2052), and the trigger head (2053) is arranged at the other end of the rotating rod (2052); The contact switch (2054) is arranged below the trigger head (2053) and is electrically connected to the valve switch of the adding tank (2055); When the concentration of the reaction liquid in the alkaline washing device (220) decreases, the float (2051) sinks, and the trigger head (2053) rises and separates from the contact switch (2054) to control the valve switch of the adding tank (2055) to open.

3. The process method of the aluminum coil continuous oxidation production line according to any one of claims 1-2, characterized in that: include, S100, unwinding aluminum coil; S200, degreasing and water washing; S300, alkali washing and water washing; among them, S301, preparing alkaline washing solution; An alkali cleaning agent having a flake caustic soda concentration of 15% and a sodium gluconate concentration of 5% is arranged in the alkali cleaning device (220), and the alkali cleaning agent is heated to 50-90° C. by steam heating; S302, uniform alkali washing; After the aluminum coil passes through the guide roller (202) of the alkali washing device (220), it continues to move, and the alkali washing time is maintained for 2 minutes; During the alkali washing process, the upper spray structure (203) and the lower stirring structure (204) in the alkali washing device (220) respectively perform uniform alkali washing on the front and back surfaces of the aluminum coil; S303, automatically adding alkaline washing liquid; The adding structure (205) automatically adds the alkaline cleaning agent according to the change of the concentration of the alkaline cleaning agent; S304, water washing; The cleaning device (300) cleans the aluminum coil by countercurrent rinsing; S305, wastewater treatment; Alkaline washing wastewater enters the supporting sewage treatment station for treatment through pipelines; S400, neutralization and water washing; S500, anodized and washed; S600, dyeing and washing; S700, sealing and washing; S800, air-dry and laminate; S900, reeling aluminum coil.

4. The process according to claim 3, characterized in that: The unwinding machine unwinds the aluminum coil, comprising S101, unwinding the aluminum coil using an unwinding machine (100); S102, uses pneumatic pressure-type inlet shears to neatly cut the ends of aluminum coils; S103, using a die-punching stitching machine to connect the new aluminum coil with the end of the aluminum coil that is about to be used up; S104, using a tension roller to support the aluminum coil to transfer the aluminum coil to the degreasing process.

5. The process according to claim 3, characterized in that: The degreasing and water washing comprises, S201, a degreasing agent with a concentration of 5% to 15% is placed in the degreasing device (210), and the degreasing agent is heated to 60° C. to 85° C. by steam heating; S202, the aluminum coil passes through the guide roller (202) in the degreasing device (210) and then moves continuously, and the degreasing time is maintained for 1 minute; S203, during the degreasing process, the upper spraying structure (203) and the lower stirring structure (204) in the degreasing device (210) respectively degrease the front and back surfaces of the aluminum coil uniformly; S204, after degreasing is completed, the cleaning device (300) cleans the aluminum coil by countercurrent rinsing.

6. The process according to claim 3, characterized in that: The neutralization and water washing include, S401, a neutralizing agent having a nitric acid concentration of 2%, a sulfuric acid concentration of 20%, and a hydrogen peroxide concentration of 5% is placed in the neutralizing device (230); S402, the aluminum coil passes through the guide roller (202) in the neutralization device (230) and keeps moving, and the neutralization time at room temperature is maintained for 1 minute; S403, during the neutralization process, the upper spray structure (203) and the lower stirring structure (204) in the neutralization device (230) respectively uniformly neutralize the front and back surfaces of the aluminum coil; S404, after neutralization, the cleaning device (300) immerses the aluminum coil in a countercurrent rinsing manner for 1 minute; S405, the neutralized wastewater enters the supporting sewage treatment facilities through pipes for centralized treatment.

7. The process according to claim 3, characterized in that: The anodizing and water washing include, S501, a reaction solution having an aluminum ion concentration of no more than 15 g / L and a sulfuric acid concentration of 17%-23% is placed in the anodizing treatment device (240), and the temperature is controlled at 20°C ± 2°C; S502, the aluminum coil continues to move after passing through the guide roller (202) in the anodizing treatment device (240), and the oxidation time is maintained for about 4 minutes; S503, during the oxidation process, the upper spray structure (203) and the lower stirring structure (204) in the anodizing treatment device (240) respectively uniformly oxidize the front and back surfaces of the aluminum coil; S504, after the oxidation is completed, the cleaning device (300) uses a countercurrent rinsing method to continue cleaning for 2 minutes.

8. The process according to claim 3, characterized in that: The dyeing and washing include, S601, a reaction solution having a dye concentration of 8 g / L-12 g / L and a colorant concentration of 5 g / L-20 g / L is placed in the dyeing device (250); S602, the aluminum coil continues to move after passing through the guide roller (202) in the dyeing device (250), and the dyeing continues for 1.5 minutes; S603, during the dyeing process, the upper spray structure (203) and the lower stirring structure (204) in the dyeing device (250) uniformly dye the front and back surfaces of the aluminum coil respectively; S604, after dyeing is completed, the cleaning device (300) cleans the aluminum coil with clean water.

9. The process according to claim 3, characterized in that: The sealing and washing include, S701, a sealing agent with a concentration of 5 g / L-8 g / L is placed in the sealing device (260), and the sealing agent is heated to 60° C.-85° C. by steam heating; S702, the aluminum coil continues to move after passing through the guide roller (202) in the sealing device (260), and the sealing is continued for 2 minutes; S703, during the sealing process, the upper spray structure (203) and the lower stirring structure (204) in the sealing device (260) respectively evenly seal the front and back sides of the aluminum coil; S704, after the sealing is completed, the cleaning device (300) cleans the aluminum coil with clean water for 20 seconds, and then uses hot water at 60°C-90°C to clean it again for 20 seconds continuously.

10. The process according to claim 3, characterized in that: The air drying and film coating comprises: S801, each production line is equipped with four air knife type air dryers (400) facing each other to air dry the aluminum coils; S802, uses continuous double-roll extrusion rollers to perform secondary drying on the surface of the aluminum coil; S803, use a laminating machine (500) to perform laminating operation on the aluminum coil.

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