Efficient and homogeneous cleaning equipment for color coating of pre-coated metal coiled material

Abstract

The utility model is suitable for the technical field of precoated metal coiled material production, and provides efficient and homogeneous cleaning equipment for precoated metal coiled material color coating, the equipment is sequentially provided with a tensioner, an ultrasonic cleaning device, an alkali liquor scrubbing device, a clear water scrubbing device and a leaching device along the coiled material conveying direction, and all the devices are isolated by pressure-adjustable wringing rollers. A plurality of groups of ultrasonic generators and immersion guide roller groups are arranged in the ultrasonic cleaning tank, and the draping degree of the coiled material is dynamically adjusted by combining a tensioner; the brushing unit adopts up-down staggered roller brushes and an internal circulation spraying device to realize double-sided cleaning; an arranged internal circulation spraying device is used for mixing recycled alkali liquor and desalted water, the homogeneous state of bath liquid is maintained through circulation spraying, it is ensured that cleaning liquid is evenly distributed, and the cleaning effect is improved. The problems that traditional cleaning equipment is low in efficiency, wastes resources and is uneven in cleaning are solved, and the device is suitable for high-linear-speed pretreatment of the pre-coated metal coiled materials.

Description

Technical Field

[0001] This utility model relates to the field of pre-coated metal coil production technology, and in particular to a high-efficiency and homogeneous cleaning device for pre-coated metal coil color coating. Background Technology

[0002] In pre-coated metal coil coating production lines, the surface of the metal substrate needs to be treated to ensure good adhesion between the coating and the substrate. First, grease and dirt adhering to the substrate surface must be cleaned, otherwise the coating adhesion will be affected. This cleaning process primarily removes oil, iron powder, or conversion films (such as zinc passivation films) that negatively impact product quality, providing a clean surface for subsequent processes. Ultimately, this lays the foundation for improved adhesion between the substrate and the paint, as well as enhanced corrosion resistance of the product.

[0003] Currently, most pre-coated metal coil color coating cleaning equipment uses ordinary tanks filled with alkaline solutions or water to perform degreasing and cleaning pretreatment through different combinations of alkaline spraying, alkaline brushing, and water spraying. When the line speed of pre-coated metal coils is low, this traditional cleaning equipment can basically meet the pretreatment requirements of the metal coil surface. However, when high-line-speed production is used, existing equipment often faces the following key problems:

[0004] (1) Uneven cleaning: At high linear speed, the surface of metal coil is prone to inadequate or uneven cleaning, resulting in residual dirt on the substrate surface, which affects the quality of subsequent coating.

[0005] (2) Liquid cross-contamination problem: During the transportation of metal coils, the cleaning liquid from the previous cleaning section is often carried into the next section. This not only leads to dilution or uneven mixing of the cleaning liquid concentration, but may also cause cross-contamination of alkaline solution and demineralized water, further affecting the cleaning effect.

[0006] (3) Decreased lifespan of cleaning solution: Due to frequent liquid cross-contamination, the lifespan of alkaline solution and desalination water is significantly shortened, the frequency of cleaning solution replacement increases, leading to increased solid waste discharge and resource waste.

[0007] Based on the problems of low surface treatment efficiency, uneven cleaning, and serious liquid cross-contamination in existing pre-coated metal coil cleaning equipment under high line speed conditions, there is an urgent need to develop a high-efficiency and homogeneous pre-coated metal coil color coating cleaning equipment that can meet the production needs of high line speed surface treatment of pre-coated metal coils, while taking into account coating quality, resource utilization and environmental protection requirements. Summary of the Invention

[0008] In view of the above situation, the purpose of this utility model is to provide a high-efficiency and homogeneous cleaning equipment for pre-coated metal coil color coating, including a tension machine, an ultrasonic cleaning equipment, an alkaline washing equipment, a clean water washing equipment and a rinsing equipment arranged sequentially along the conveying direction of the metal coil. Each piece of equipment is isolated by a set of squeeze rollers and is equipped with an internal circulation spray device to mix and circulate alkaline solution and demineralized water.

[0009] The ultrasonic cleaning equipment includes an ultrasonic cleaning tank, multiple ultrasonic generators located at the bottom of the tank, guide roller groups at the front and rear ends of the tank, and an internal circulation spray device. The guide roller group includes a conveying roller for flat conveying of metal coils and a pressure roller for pressing down on metal coils.

[0010] The alkaline washing equipment and the clean water washing equipment respectively include a washing tank, a set of roller brushes arranged in a staggered manner, and an internal circulation spray device located in front of the roller brushes.

[0011] The rinsing equipment includes a rinsing tank and an internal circulating spray device;

[0012] The internal circulation spraying device includes a lower U-shaped circulation pipe, a spraying pipe and nozzles. One end of the lower U-shaped circulation pipe is connected to a liquid storage tank through a switch valve, and the other end is connected to the spraying pipe through a switch valve. The spraying pipe is equipped with nozzles.

[0013] The ultrasonic cleaning equipment and the alkaline washing equipment are equipped with a first squeezing roller, the alkaline washing equipment and the clean water washing equipment are equipped with a second squeezing roller, the clean water washing equipment and the rinsing equipment are equipped with a third squeezing roller, and the rinsing equipment is equipped with a fourth squeezing roller. The squeezing roller group squeezes the surface of the metal coil to prevent the cleaning liquid from flowing between the tanks of the cleaning equipment and ensures the recycling of the cleaning liquid.

[0014] Each piece of equipment is equipped with an independent liquid supply system, including a liquid storage tank and a delivery pipe with a control valve.

[0015] The cleaning equipment for pre-coated metal coils described above includes an ultrasonic cleaning device and an alkaline cleaning device containing an alkaline cleaning solution with a pH value of 9-11, and a water cleaning device and a rinsing device containing demineralized water with a conductivity of ≤0.3µs / cm. The alkaline solution and demineralized water are mixed and circulated through an internal circulation spray device to ensure the homogeneity and stability of the cleaning solution.

[0016] As described above, the cleaning equipment for pre-coated metal coils includes an ultrasonic cleaning device equipped with multiple ultrasonic generators located below the ultrasonic cleaning tank. The number of ultrasonic generators is set according to the tank length and cleaning requirements. Multiple ultrasonic generators work together to generate high-intensity ultrasonic waves, enabling the surface of the metal coils to be cleaned more uniformly and efficiently, thereby improving cleaning efficiency and effectiveness.

[0017] As described above, the pre-coated metal coil color coating cleaning equipment includes a tensioner installed in front of the ultrasonic cleaning tank. The tensioner adjusts the tension of the metal coil to control its suspension. Combined with the traction and downward pressure of the guide roller group at the front end of the tank, the metal coil is suspended to a depth of one-third to two-thirds of the tank height, ensuring that the metal coil is immersed in the alkaline solution in the ultrasonic cleaning tank, achieving uniform cleaning and wetting.

[0018] As described above, the pre-coated metal coil color coating cleaning equipment has roller brush groups that are staggered vertically by 15-30mm to facilitate comprehensive cleaning of both sides of the metal coil. The internal circulation spray device adopts a double-layer fan-shaped nozzle configuration with a spray pressure of 0.2-0.8MPa and a coverage width ≥ 1.2 times the width of the coil.

[0019] The cleaning equipment for pre-coated metal coils described above, wherein the surface of the squeeze roller is covered with a nitrile rubber layer, and the lifting stroke is 0~75mm.

[0020] As described above, the cleaning equipment for pre-coated metal coil color coating includes a liquid storage tank located below the tank of each cleaning equipment. The liquid delivery pipe is lowered from above each cleaning equipment to one side of the tank and is equipped with a switch valve to facilitate the input of fresh alkaline solution and demineralized water. It is used in conjunction with an internal circulation spray device to achieve the recycling and homogenization of the cleaning solution.

[0021] Compared with the prior art, the advantages of this utility model are as follows:

[0022] This utility model provides a pre-coated metal coil color coating cleaning equipment designed to solve the problems of low efficiency, resource waste, and uneven cleaning in traditional cleaning equipment under high line speed conditions. The equipment employs a multi-stage coordinated cleaning process including ultrasonic cleaning, alkaline brushing, clean water brushing, and rinsing to ensure thorough and uniform cleaning of the metal coil surface. An internal circulation spray device mixes and circulates alkaline and demineralized water solutions, maintaining a homogeneous state of the tank solution through circulating spraying, ensuring uniform distribution of the cleaning solution and improving cleaning effectiveness. The ultrasonic cleaning tank is equipped with multiple sets of ultrasonic generators and guide rollers, combined with a tensioner to dynamically adjust the coil sag, ensuring the metal coil is suspended and immersed in the cleaning solution for efficient cleaning. The brushing unit uses an upper and lower staggered roller brush design, combined with the internal circulation spray device, to achieve comprehensive cleaning of both sides of the metal coil, ensuring uniform surface treatment. Adjustable pressure squeezing rollers are installed between equipment sections to effectively isolate each cleaning stage, preventing cross-contamination of the cleaning solution between different stages and reducing waste.

[0023] Through the above innovative design, this utility model significantly improves cleaning efficiency and homogeneity, reduces resource waste and environmental pressure, is suitable for high-speed pretreatment of pre-coated metal coils, and is widely used in metal coil coating production lines, laying a solid foundation for improving product coating quality and high added value. Attached Figure Description

[0024] The following figures are intended only to illustrate and explain the present invention and do not limit the scope of the present invention. Wherein:

[0025] Figure 1 This is a schematic diagram of the layout and structure of the cleaning equipment for pre-coated metal coil color coating provided by this utility model.

[0026] The following are the reference numerals: 1. Tensioner, 2. Ultrasonic cleaning equipment, 3. Alkaline washing equipment, 4. Clean water washing equipment, 5. Rinsing equipment, 6. Liquid supply system, 7. Squeeze roller assembly;

[0027] Ultrasonic cleaning tank, 202. Ultrasonic generator, 203. Guide roller assembly, 301. Brushing tank, 302. Roller brush assembly, 501. Rinse tank, 502. Internal circulation spray device, 601. Storage tank, 602. Control valve, 603. Infusion pipe, 701. Squeeze roller one, 702. Squeeze roller two, 703. Squeeze roller three, 704. Squeeze roller four;

[0028] 2031. Conveyor roller, 2032. Pressure roller, 5021. U-shaped circulation pipe, 5022. Spray pipe, 5023. Nozzle. Detailed Implementation

[0029] To provide a clearer understanding of the technical solution, purpose, and effects of this utility model, the specific embodiments of this utility model are now described in conjunction with the accompanying drawings.

[0030] like Figure 1 As shown, this utility model provides a high-efficiency and homogeneous cleaning device for pre-coated metal coil color coating. The cleaning device includes: a tension machine 1, an ultrasonic cleaning device 2, an alkaline washing device 3, a clean water washing device 4, and a rinsing device 5, arranged sequentially along the metal coil conveying direction. Each device is isolated by a squeezing roller group 7 and is equipped with an internal circulating spray device 502 for mixing and circulating alkaline and demineralized water solutions to ensure homogeneity of the cleaning solution. The equipment has a reasonable structure, and the squeezing roller group 7 isolates each process, preventing liquid cross-contamination and improving cleaning efficiency and resource utilization.

[0031] The ultrasonic cleaning equipment includes an ultrasonic cleaning tank 201, multiple ultrasonic generators 202 located at the bottom of the tank, guide roller groups 203 (including conveyor rollers 2031 for horizontally conveying the metal coil and pressure rollers 2032 for downwardly pressing the metal coil) located at the front and rear ends of the tank, and an internal circulation spray device 502. The ultrasonic generators 202 are distributed at the bottom of the ultrasonic cleaning tank 201, and their number is set according to the tank length and cleaning requirements to ensure uniform distribution of ultrasonic energy within the cleaning area. The guide roller groups 203, through horizontally conveying and downwardly pressing the metal coil, ensure that the metal coil remains stable during the cleaning process, avoiding vibration or displacement.

[0032] The alkaline washing equipment 3 and the clean water washing equipment 4 each include a washing tank 301, a set of vertically staggered roller brushes 302, and an internal circulation spray device 502 located in front of the roller brushes. The vertically staggered design of the roller brushes 302 facilitates thorough washing of both sides of the metal coil. Simultaneously, the internal circulation spray device 502 sprays alkaline solution or clean water evenly onto the surface of the metal coil through nozzles 5023. Combined with the washing action of the roller brushes, this ensures sufficient contact between the cleaning solution and the surface of the metal coil. The vertically staggered distance of the roller brushes 302 is 15-30mm, the spray pressure of the internal circulation spray device 502 is 0.2-0.8MPa, and the nozzles 5023 adopt a double-layer fan-shaped design, with a coverage width reaching 1.2 times the width of the coil, ensuring uniformity of the cleaning effect.

[0033] The rinsing equipment 5 includes a rinsing tank 501 and an internal circulation spray device 502. The internal circulation spray device 502, through a combination of a U-shaped circulation pipe 5021, a spray pipe 5022, and nozzles 5023, circulates the cleaning solution onto the surface of the metal coil, ensuring the homogeneity of the rinsing effect. One end of the U-shaped circulation pipe 5021 is connected to a liquid storage tank 601 via a switch valve, and the other end is connected to the spray pipe 5022 via a switch valve. The spray pipe 5022 is equipped with nozzles 5023, facilitating adjustment of the spray flow rate and pressure to ensure uniform distribution of the cleaning solution on the surface of the metal coil.

[0034] The internal circulation spray device 502 is the core innovative component of this equipment, used to mix and circulate alkaline solution and demineralized water to ensure the homogeneity and stability of the cleaning solution. In the ultrasonic cleaning device 1, the internal circulation spray device 502 works in conjunction with the guide roller group 203 to ensure that the surface of the metal coil is thoroughly cleaned under the action of ultrasound. In the alkaline solution brushing device 3 and the clean water brushing device 4, the internal circulation spray device 502 works in conjunction with the roller brush group 302 to achieve comprehensive cleaning of both sides of the metal coil. In the rinsing device 5, the internal circulation spray device 502 sprays the cleaning solution evenly onto the surface of the metal coil through the nozzle 5023 to ensure the homogeneous distribution of the cleaning solution.

[0035] The squeeze roller assembly 7 is used to isolate different cleaning sections, prevent the cleaning solution from mixing, and ensure the recycling of the cleaning solution. The surface of the squeeze roller is coated with a nitrile rubber layer, which has good wear resistance and corrosion resistance. The lifting stroke of the squeeze roller is 0~75mm, and the pressure of the squeeze roller can be adjusted according to actual needs to ensure uniform distribution of cleaning solution on the surface of the metal coil, while avoiding excessive cleaning solution residue. The squeeze roller assembly includes squeeze roller 1 701 (between the ultrasonic cleaning equipment and the alkaline washing equipment), squeeze roller 2 702 (between the alkaline washing equipment and the clean water washing equipment), squeeze roller 3 703 (between the clean water washing equipment and the rinsing equipment), and squeeze roller 4 704 (after the rinsing equipment). Each squeeze roller can independently adjust its pressure and height to adapt to the needs of different cleaning sections.

[0036] Each cleaning device is equipped with an independent liquid supply system 6, including a storage tank 601 and a delivery pipe 603 with a control valve 602. The storage tank 601 is located below the tank body of each cleaning device, and the delivery pipe 603 is lowered from above the cleaning device to one side of the tank body and is equipped with a switch valve to facilitate the introduction of fresh alkaline solution and demineralized water. Through the coordinated operation of the internal circulation spray device 502 and the independent liquid supply system, the cleaning solution can be recycled and homogenized, reducing the discharge of cleaning waste liquid and improving resource utilization.

[0037] In summary, after the tension of the metal coil is adjusted by the tensioner 1, it enters the ultrasonic cleaning equipment 2. The ultrasonic generator 201 generates high-intensity ultrasonic waves to clean the oil and impurities on the surface of the metal coil. At the same time, the roller brush assembly 302 brushes the surface of the metal coil in both directions to initially remove stubborn dirt. The internal circulation spray device 502 sprays alkaline cleaning solution (pH value 9-11) evenly onto the surface of the metal coil to ensure the homogeneity of the cleaning solution. The metal coil then enters the alkaline washing equipment 3 from the ultrasonic cleaning equipment 2. The roller brush assembly 302 is staggered vertically by 15-30mm to brush the surface of the metal coil in both directions, combined with the internal circulation spray device. The spraying action of 502 further removes dirt from the surface of the metal coil. The metal coil enters the clean water washing equipment 4 from the alkaline washing equipment 3. The roller brush group 302 and the internal circulation spraying device 502 work together to use desalinated water with a conductivity ≤0.3µs / cm to wash the surface of the metal coil and remove residual alkaline substances. Finally, the metal coil enters the rinsing equipment 5. The internal circulation spraying device 502 sprays desalinated water with a conductivity ≤0.3µs / cm evenly onto the surface of the metal coil to thoroughly remove residual cleaning liquid and impurities, ensuring that the surface of the metal coil is clean and hygienic, providing a good foundation for subsequent coating processes.

[0038] This invention achieves efficient and homogeneous cleaning through multi-stage coordinated cleaning, internal circulation spray homogenization design, and anti-liquid cross-contamination design. It solves the problems of uneven cleaning, severe liquid cross-contamination, and resource waste associated with traditional cleaning equipment under high linear speed conditions. The equipment is suitable for high-linear-speed pretreatment of pre-coated metal coils, effectively improving cleaning efficiency and coating quality, reducing production costs and environmental pollution, and providing an efficient and environmentally friendly cleaning solution for coating production lines of pre-coated metal coils.

[0039] The cleaning equipment for pre-coated metal coils described above is merely an illustrative embodiment of this utility model and is not intended to limit the scope of this utility model. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of this utility model should fall within the protection scope of this utility model.

Claims

1. A high efficient and homogeneous pre-coated metal coil cleaning equipment for color coating, characterized in that The device comprises a tensioner, an ultrasonic cleaning device, an alkali liquid brushing device, a clean water brushing device and a rinsing device arranged in sequence along the conveying direction of the metal coil, each device is isolated by a squeezing roller group and is provided with an internal circulation spraying device for mixing and circulating the alkali liquid and desalted water; The ultrasonic cleaning device comprises an ultrasonic cleaning tank, a plurality of ultrasonic generators arranged at the bottom of the tank, guide roller groups arranged at the front and rear ends of the tank and an internal circulation spraying device, the guide roller groups comprise conveying rollers for conveying the metal coil and pressing rollers for pressing the metal coil; The alkali liquid brushing device and the clean water brushing device each comprise a brushing tank, an upper and lower staggered roller brush group and an internal circulation spraying device arranged in front of the roller brush group; The rinsing device comprises a rinsing tank and an internal circulation spraying device; The internal circulation spraying device comprises a lower U-shaped circulation pipe, a spraying pipe and a nozzle, one end of the lower U-shaped circulation pipe is connected to a liquid storage tank through a switch valve, the other end is connected to the spraying pipe through a switch valve, and the spraying pipe is provided with a nozzle; The ultrasonic cleaning device and the alkali liquid brushing device are provided with a first squeezing roller, the alkali liquid brushing device and the clean water brushing device are provided with a second squeezing roller, the clean water brushing device and the rinsing device are provided with a third squeezing roller, and the rinsing device is provided with a fourth squeezing roller, the squeezing roller groups squeeze the surface of the metal coil to avoid the cross-contamination of the cleaning liquid between the tanks of the cleaning devices and ensure the recycling of the cleaning liquid; Each device is provided with an independent liquid supply system comprising a liquid storage tank and a liquid supply pipe with a control valve.

2. The pre-coated metal coil cleaning apparatus for color coating according to claim 1, wherein The ultrasonic cleaning device and the alkali liquid brushing device are filled with an alkaline cleaning liquid with a pH value of 9-11, and the clean water brushing device and the rinsing device are filled with desalted water with an electrical conductivity of ≤0.3 µs / cm, the alkaline cleaning liquid and the desalted water are mixed and circulated by the internal circulation spraying device to ensure the homogeneity and stability of the cleaning liquid.

3. The pre-coated metal coil cleaning apparatus for color coating according to claim 1, wherein The ultrasonic cleaning device is provided with a plurality of ultrasonic generators arranged below the ultrasonic cleaning tank, the number of the ultrasonic generators is determined according to the length of the tank and the cleaning requirement, the plurality of ultrasonic generators work cooperatively to generate high-intensity ultrasonic waves, the surface of the metal coil is cleaned more uniformly and efficiently, and the cleaning efficiency and effect are improved.

4. The pre-coated metal coil cleaning apparatus for color coating according to claim 1, wherein The ultrasonic cleaning device is provided with a tensioner arranged in front of the ultrasonic cleaning tank, the tension of the metal coil is adjusted by the tensioner, the size of the tension is adjusted to control the suspension of the metal coil, the metal coil is pulled and pressed by the guide roller groups at the front end in the tank, the suspension depth of the metal coil is one third to two thirds of the height of the tank, the metal coil is ensured to be immersed in the alkali liquid in the ultrasonic cleaning tank, and uniform cleaning and infiltration are realized.

5. The pre-coated metal coil cleaning apparatus for color coating according to claim 1, wherein The roller brush group of the brushing device is staggered by 15-30 mm, the internal circulation spraying device is provided with double-layer fan-shaped nozzles, the spraying pressure is 0.2-0.8 MPa, and the coverage width is ≥1.2 times the width of the coil.

6. The pre-coated metal coil cleaning apparatus for color coating according to claim 1, wherein The surface of the squeezing roller is coated with a nitrile rubber layer, and the lifting stroke is 0-75 mm.

7. The pre-coated metal coil cleaning apparatus for color coating according to claim 1, wherein The liquid storage tank is arranged below each cleaning equipment tank body, the liquid delivery pipe is lowered from above each cleaning equipment to one side of the tank body, and a switch valve is arranged, so that fresh lye and desalted water can be conveniently input, and the switch valve is combined with the internal circulation spraying device to realize recycling and homogeneous mixing of the cleaning liquid.

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