A passivation adjusting device for adjusting the thickness of a passivation film after zinc-aluminum-magnesium plating

Abstract

The utility model discloses a kind of passivation adjusting devices of adjustable zinc-aluminum-magnesium plating layer plating post-passivation film thickness, including passivation treatment box, conveying mechanism, passivation liquid spraying assembly and thickness detection component;The conveying mechanism is through the passivation treatment box, for conveying zinc-aluminum-magnesium plating layer workpiece;The passivation liquid spraying assembly is installed in the passivation treatment box inside, and it is located above the conveying mechanism, for passivation liquid is sprayed to workpiece surface;The thickness detection component is set to the outlet end of the passivation treatment box, for detecting the thickness of workpiece surface passivation film, operator can according to the thickness data of thickness detection component feedback, the utility model structure design is novel, can realize the accurate control of passivation film thickness, improve product quality stability, reduce production cost, suitable for different specifications zinc-aluminum-magnesium plating layer workpiece's passivation treatment.

Description

Technical Field

[0001] This utility model relates to the field of metal surface treatment technology, specifically a passivation adjustment device that can adjust the thickness of the passivation film after zinc, aluminum and magnesium plating. Background Technology

[0002] Zinc-aluminum-magnesium (ZAM) coatings possess excellent corrosion resistance, wear resistance, and formability, making them widely used in the automotive, home appliance, and construction industries. Post-coating passivation is a crucial step in the ZAM production process. By forming a passivation film on the coating surface, the corrosion resistance and adhesion of the coating can be further improved, extending the product's service life.

[0003] The thickness of the passivation film directly affects the performance of the product. If the passivation film is too thin, it cannot provide effective protection, leading to a decrease in the product's corrosion resistance. If the passivation film is too thick, it will increase production costs and may affect the subsequent processing performance of the coating (such as welding performance and coating performance). Therefore, precise control of the passivation film thickness is crucial.

[0004] In existing technologies, passivation treatment of zinc-aluminum-magnesium coatings typically employs a fixed-parameter spraying method, where the conveying speed and passivation solution spraying volume are preset and maintained throughout the production process. However, due to variations in workpiece specifications (such as width and thickness), fluctuations in passivation solution concentration, and differences in equipment operating conditions, the fixed-parameter spraying method struggles to guarantee consistent passivation film thickness, easily leading to thickness deviations. Furthermore, existing devices lack convenient thickness detection and manual adjustment mechanisms, requiring periodic manual sampling inspections, which is not only inefficient but also fails to promptly detect and correct thickness deviations, resulting in poor product quality stability and a high defect rate. Therefore, it is necessary to design a passivation adjustment device that can adjust the thickness of the passivation film after zinc-aluminum-magnesium coating plating. Utility Model Content

[0005] The purpose of this invention is to provide a passivation adjustment device that can adjust the thickness of the passivation film after zinc-aluminum-magnesium plating, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a passivation adjustment device for adjusting the thickness of the passivation film after zinc-aluminum-magnesium plating, comprising: The passivation treatment box forms a closed passivation treatment space inside; A conveying mechanism, passing through the passivation treatment box, is used to carry and convey zinc-aluminum-magnesium coated workpieces; A passivation liquid spraying assembly is installed inside the passivation treatment box and located above the conveying mechanism. The passivation liquid spraying assembly includes a storage tank, a pump, a spraying pipe, and multiple nozzles. The storage tank is connected to the spraying pipe through the pump, and the multiple nozzles are spaced apart on the spraying pipe for uniformly spraying passivation liquid onto the workpiece surface. A thickness detection component is located outside the outlet end of the passivation treatment box. The thickness detection component is an eddy current thickness gauge, which is used to detect the thickness of the passivation film on the workpiece surface in real time.

[0007] Preferably, the conveying mechanism includes a drive roller, a driven roller, a conveyor belt, and a drive motor. The drive roller and the driven roller are rotatably mounted at both ends of the passivation treatment box, the conveyor belt is sleeved on the drive roller and the driven roller, and the drive motor is connected to the drive roller in a transmission manner.

[0008] Preferably, the spraying pipe is equipped with a manual flow regulating valve, and the infusion pump is a manually adjustable variable pump.

[0009] Preferably, the passivation treatment box is further provided with a guide plate, which is located above the conveying mechanism and parallel to the conveying direction of the conveyor belt. The guide plate is used to limit the workpiece.

[0010] Preferably, the bottom of the passivation treatment box is provided with a liquid collection tank, the liquid collection tank is connected to the liquid storage tank through a return pipe, and a filter is provided on the return pipe.

[0011] Preferably, the thickness detection assembly further includes a mounting bracket, which is fixed to the outlet end of the passivation treatment box. The detection probe of the eddy current thickness gauge is mounted on the mounting bracket by adjusting bolts to adjust the distance between the detection probe and the workpiece surface.

[0012] Beneficial effects: This utility model features a novel structural design that enables precise control of the passivation film thickness, improves product quality stability, reduces production costs, and is suitable for passivation treatment of zinc, aluminum, and magnesium coated workpieces of different specifications.

[0013] This invention employs a high-precision eddy current thickness gauge, which can acquire passivation film thickness data immediately after the workpiece leaves the passivation treatment box. This avoids the lag and randomness of traditional manual sampling inspection, ensuring that the thickness data of each workpiece can be monitored in real time, and further improving the passivation film thickness control accuracy.

[0014] The inclined liquid collection tank at the bottom of the passivation treatment box of this utility model can efficiently collect the passivation liquid dripping during the spraying process, avoiding the waste and environmental pollution caused by direct discharge of passivation liquid; the high-precision filter on the return pipe can effectively remove workpiece debris, dust and other impurities from the passivation liquid, ensuring that the purity of the recycled passivation liquid meets the process requirements and avoiding impurities from affecting the quality of the passivation film; the filtered passivation liquid flows back into the storage tank through the return pipe, realizing the reuse of the passivation liquid.

[0015] The above description is merely an overview of the technical solutions of the embodiments of this application. In order to better understand the technical means of the embodiments of this application and to implement them in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the embodiments of this application more apparent and understandable, specific implementation methods of this application are described below. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the passivation liquid spraying assembly of this utility model. Figure 3 This is a schematic diagram of the installation of the thickness detection component of this utility model. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims and drawings of this application are intended to cover non-exclusive inclusion.

[0019] Furthermore, the terms "first," "second," etc., in the specification and claims of this application or in the aforementioned drawings are used to distinguish different objects rather than to describe a specific order, and may explicitly or implicitly include one or more of the features.

[0020] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, "connection" or "joining" in mechanical structures can refer to a physical connection, such as a fixed connection, for example, a connection fixed by fasteners, such as a connection fixed by screws, bolts, or other fasteners; a physical connection can also be a detachable connection, such as a snap-fit ​​or interlocking connection; a physical connection can also be an integral connection, such as a connection formed by welding, bonding, or integral molding. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0021] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0022] Please see Figures 1-3 This utility model discloses a passivation adjustment device that can adjust the thickness of the passivation film after zinc-aluminum-magnesium plating, comprising: Passivation treatment box 1 is made of stainless steel and has internal reinforcing ribs welded to ensure structural stability. High-temperature resistant sealing strips are pasted on the inner side of the box wall to ensure that a closed passivation treatment space is formed inside, preventing the passivation liquid from evaporating or external impurities from entering. The conveying mechanism includes a drive roller 6, a driven roller 7, a conveyor belt 8, and a drive motor 9. First, the drive roller 6 and driven roller 7 are rotatably mounted on the outer ends of the passivation treatment box 1 via bearing seats, ensuring that the axes of the drive roller 6 and driven roller 7 are on the same horizontal plane to ensure smooth operation of the conveyor belt 8. The conveyor belt 8 is made of corrosion-resistant polytetrafluoroethylene (PTFE), with uniformly distributed micro-ventilation holes on its surface to prevent the workpiece from sticking to the conveyor belt 8 due to residual passivation liquid. The drive motor 9 is a servo motor, connected to the drive roller 6 via a coupling, and is equipped with a speed controller to adjust the conveying speed of the conveyor belt 8 according to the workpiece specifications and passivation process requirements.

[0023] In this invention, the passivation liquid spraying assembly includes a storage tank 2, a pump 3, a spraying pipe 4, and multiple nozzles 5. The storage tank 2 is placed on a bracket outside the passivation treatment box 1. A liquid level sensor is installed inside the tank to monitor the remaining passivation liquid level in real time, issuing an alarm signal when the level falls below a preset value. The pump 3 is a manually adjustable variable pump; its inlet is connected to the bottom of the storage tank 2 via a pipe, and its outlet is connected to the spraying pipe 4 via a high-pressure hose. The spraying pipe 4 is made of stainless steel and is fixed to a crossbeam inside the passivation treatment box 1 with clips, located directly above the conveyor belt 8, with the pipe axis perpendicular to the conveying direction of the conveyor belt 8. The multiple nozzles 5 are fan-shaped atomizing nozzles, evenly installed at 10-15cm intervals at the bottom of the spraying pipe 4. The spray angle of the nozzles 5 can be adjusted using adjusting nuts to ensure that the spray area of ​​all nozzles 5 covers the entire width of the conveyor belt 8, achieving uniform spraying of the passivation liquid. In addition, a manual flow regulating valve 10 is installed on the spraying pipe 4, and the operator can adjust the flow rate of the passivation liquid by rotating the valve handle; In this invention, the thickness detection component includes an eddy current thickness gauge 5 and a mounting frame 15. The mounting frame 15 is made of welded angle steel and is fixed to the outside of the outlet end of the passivation treatment box 1 by expansion bolts. The height of the mounting frame 15 can be adjusted by adjusting screws. A high-precision eddy current thickness gauge is selected, with a detection accuracy of ±1μm. The detection probe is installed below the crossbeam of the mounting frame 15 by adjusting bolts, and the axis of the detection probe is perpendicular to the surface of the conveyor belt 8. By loosening the adjusting bolts, the detection probe can be moved up and down to adjust its distance from the workpiece surface, typically controlled at 2-5mm to ensure the accuracy of the detection data. The display screen and operation buttons of the eddy current thickness gauge are located on the side of the mounting frame 15 for easy observation of the detection data by the operator. The thickness gauge also supports data storage and export functions, recording continuous 24-hour detection data for subsequent process analysis.

[0024] In this invention, inside the passivation treatment box 1, a guide plate 11 is installed on each side above the conveyor belt 8. The guide plate 11 is made of wear-resistant nylon and is fixed to the internal support of the box with bolts. The length of the guide plate 11 is consistent with the internal length of the passivation treatment box 1, and its extension direction is parallel to the conveying direction of the conveyor belt 8. The distance between the two guide plates 11 can be adjusted by adjusting bolts, with an adjustment range of 10-100cm, to accommodate zinc-aluminum-magnesium coated workpieces of different widths. This serves to limit the workpiece, prevent it from shifting during conveying, and ensure that the workpiece surface can uniformly receive the passivation liquid spraying.

[0025] In addition, an inclined liquid collection tank 12 is provided at the bottom of the passivation treatment tank 1, with an inclination angle of 5°-10°. A drain outlet is provided at the lowest end, which is connected to the top of the storage tank 2 through a return pipe 13. A filter 14 is installed on the return pipe 13. The filter 14 has a double-layer filtration structure, with a stainless steel filter screen on the upper layer and an activated carbon filter layer on the lower layer, which can effectively remove workpiece debris, dust and other impurities from the passivation solution. In addition, a one-way valve is also installed on the return pipe 13 to prevent the passivation solution in the storage tank 2 from flowing back into the liquid collection tank 12.

[0026] In this device, a conveying mechanism passes through the passivation treatment chamber, delivering the zinc-aluminum-magnesium coated workpiece into the enclosed space inside. The passivation solution spraying assembly's storage tank, via a manually adjustable variable pump and a spraying pipe with a manual flow control valve, evenly sprays the passivation solution onto the workpiece through a nozzle. Waste liquid is collected in a pool at the bottom of the chamber, filtered, and then returned to the storage tank for recycling. An eddy current thickness gauge at the chamber outlet monitors the passivation film thickness in real time. Operators adjust the pump flow rate, valve opening, or conveying speed based on the data to achieve precise control of the passivation film thickness.

[0027] In summary, this utility model has a novel structural design, which enables precise control of the passivation film thickness, improves product quality stability, reduces production costs, and is suitable for passivation treatment of zinc-aluminum-magnesium coated workpieces of different specifications.

[0028] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A passivation adjustment device for adjusting the thickness of the passivation film after zinc-aluminum-magnesium plating, characterized in that: include: The passivation treatment box (1) forms a closed passivation treatment space inside; A conveying mechanism, passing through the passivation treatment box (1), is used to carry and convey zinc-aluminum-magnesium coated workpieces; A passivation liquid spraying assembly is installed inside the passivation treatment box (1) and located above the conveying mechanism. The passivation liquid spraying assembly includes a storage tank (2), a pump (3), a spraying pipe (4), and multiple nozzles (5). The storage tank (2) is connected to the spraying pipe (4) through the pump (3). Multiple nozzles (5) are spaced apart on the spraying pipe (4) for uniformly spraying passivation liquid onto the workpiece surface. A thickness detection assembly is located outside the outlet end of the passivation treatment box (1). The thickness detection assembly is an eddy current thickness gauge for real-time detection of the thickness of the passivation film on the workpiece surface.

2. The passivation adjustment device for adjusting the thickness of the passivation film after zinc-aluminum-magnesium plating according to claim 1, characterized in that: The conveying mechanism includes a drive roller (6), a driven roller (7), a conveyor belt (8), and a drive motor (9). The drive roller (6) and the driven roller (7) are rotatably mounted on both ends of the passivation treatment box (1). The conveyor belt (8) is sleeved on the drive roller (6) and the driven roller (7). The drive motor (9) is connected to the drive roller (6) in a transmission manner.

3. The passivation adjustment device for adjusting the thickness of the passivation film after zinc-aluminum-magnesium plating according to claim 1, characterized in that: The spraying pipe (4) is equipped with a manual flow regulating valve (10), and the infusion pump (3) is a manually adjustable variable pump.

4. The passivation adjustment device for adjusting the thickness of the passivation film after zinc-aluminum-magnesium plating according to claim 1, characterized in that: The passivation treatment box (1) is also provided with a guide plate (11). The guide plate (11) is located above the conveying mechanism and is parallel to the conveying direction of the conveyor belt. The guide plate (11) is used to limit the workpiece.

5. The passivation adjustment device for adjusting the thickness of the passivation film after zinc-aluminum-magnesium plating according to claim 1, characterized in that: The bottom of the passivation treatment box (1) is provided with a liquid collection tank (12), which is connected to the storage tank (2) through a return pipe (13). A filter (14) is provided on the return pipe (13).

6. The passivation adjustment device for adjusting the thickness of the passivation film after zinc-aluminum-magnesium plating according to claim 1, characterized in that: The thickness detection assembly also includes a mounting bracket (15), which is fixed to the outlet end of the passivation treatment box (1). The detection probe of the eddy current thickness gauge is mounted on the mounting bracket (15) by adjusting bolts to adjust the distance between the detection probe and the workpiece surface.

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