Pickling device for metal surface treatment

Abstract

The utility model discloses a pickling device for metal surface treatment, which relates to the technical field of metal surface treatment and is technically characterized by comprising a pickling tank, fluid circulating mechanisms are arranged on two sides in the pickling tank, and a stirring mechanism is arranged at the bottom of the pickling tank; the fluid circulation mechanism comprises a circulation pipe embedded in the side wall of the pickling tank, the circulation pipe is provided with a liquid inlet, the liquid inlet is located at the bottom of the pickling tank, the circulation pipe is provided with two liquid outlets, the two liquid outlets are located in the middle and the upper portion of the pickling tank, and the two liquid outlets are provided with a first circulation pump and a second circulation pump respectively; according to the acid pickling device, the uniformity of acid pickling liquid can be improved, and the consistency of the surface treatment effect is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to metal surface treatment technical field especially is related to a pickling device for metal surface treatment. BACKGROUND

[0002] Metal surface pickling is a key process that removes the oxide layer, rust, welding slag and other contaminants on the surface of metal materials through chemical methods, and is widely used in the pretreatment stage of steel, stainless steel, copper, aluminum and other metals. Its core principle is to use acid solution (such as hydrochloric acid, sulfuric acid, nitric acid, hydrofluoric acid or mixed acid) to react with metal oxides, converting insoluble oxides into soluble salts, thereby exposing clean metal matrix. The pickling process not only improves the smoothness of the metal surface, but also enhances the adhesion of subsequent coating, electroplating or welding processes, and is an indispensable link in the metal processing industry chain.

[0003] The prior art patent application No. CN202421038772.X discloses a kind of metal surface high-efficiency pickling device, although it has certain technical improvement, but it cannot solve the technical problems that the concentration of pickling solution is not uniform, which leads to inconsistent surface treatment effect, and some areas are over-eroded or insufficiently treated.

[0004] When the concentration of pickling solution is too high or locally enriched, the chemical reaction rate between metal matrix and acid solution will significantly increase, leading to excessive dissolution of the metal surface. This not only damages the geometric dimensional accuracy of the metal (such as workpiece thinning, edge depression), but also may cause intergranular corrosion or hydrogen embrittlement, etc., which seriously reduces the mechanical properties and service life of the material. For example, when high-concentration hydrochloric acid is used to pickle stainless steel, if the local concentration is out of control, it may cause pitting or grain boundary corrosion.

[0005] If the concentration of pickling solution is too low or the flow is not smooth, the oxide layer on the metal surface cannot be completely dissolved, resulting in residual oxides or rust adhering to the matrix. These residues will reduce the adhesion of the subsequent coating, and even cause corrosion propagation during service. For example, if the concentration is insufficient during carbon steel pickling, the iron oxide scale may remain in the form of "floating rust", affecting the rust prevention effect.

[0006] Concentration unevenness also leads to significant regional differences in metal surface treatment effect (such as uneven color and roughness), making it difficult to meet the stringent requirements of high-end manufacturing (such as automobiles, aerospace) for surface quality. SUMMARY

[0007] To solve the above technical problems, the purpose of the utility model is to provide a pickling device for metal surface treatment, which improves the uniformity of pickling solution and ensures the consistency of surface treatment effect.

[0008] To achieve the above purpose, the utility model provides the following technical solutions:

[0009] The acid pickling device for metal surface treatment comprises an acid pickling tank, fluid circulation mechanisms arranged on both sides of the acid pickling tank, and a stirring mechanism arranged at the bottom of the acid pickling tank; the fluid circulation mechanism comprises a circulation pipe embedded in the sidewall of the acid pickling tank, the circulation pipe has one liquid inlet, the liquid inlet is located at the bottom of the acid pickling tank, and the circulation pipe has two liquid outlets, the two liquid outlets are located at the middle and upper parts of the acid pickling tank, and the two liquid outlets are respectively provided with a first circulation pump and a second circulation pump.

[0010] Preferably, the first circulation pump is located above the second circulation pump, and the output power of the first circulation pump is greater than that of the second circulation pump.

[0011] Preferably, the two liquid outlets are both directed towards the central axis of the acid pickling tank.

[0012] Preferably, the stirring mechanism comprises a stirring motor embedded in the bottom of the acid pickling tank, the output shaft of the stirring motor extends into the acid pickling tank and is connected with an L-shaped stirring rod, the stirring rod is movably attached to the inner wall of the acid pickling tank, and the output shaft of the stirring motor is rotatably connected with the bottom of the acid pickling tank through a bearing.

[0013] Preferably, the surfaces of the stirring rod, the bearing and the inner wall of the circulation pipe are all coated with an anticorrosion coating.

[0014] Preferably, a plurality of turbulence holes are formed in the stirring rod.

[0015] The utility model has the following beneficial effects:

[0016] The fluid circulation mechanism is designed as follows: fluid circulation mechanisms are arranged on both sides of the acid pickling tank, and the circulation pipe embedded in the sidewall has one liquid inlet located at the bottom of the acid pickling tank and two liquid outlets located at the middle and upper parts of the acid pickling tank. This design sends the pickling liquid at the bottom to the middle and upper parts through the circulation pipe, breaks the possible stratification or local concentration difference of the pickling liquid in the acid pickling tank, promotes the flow and mixing of the pickling liquid in the vertical direction, and helps to improve the uniformity of the pickling liquid as a whole.

[0017] The first circulation pump is located above the second circulation pump, and the output power of the first circulation pump is greater than that of the second circulation pump. This arrangement makes the flow rates and flow volumes of the pickling liquid sprayed from the liquid outlets at different heights different, further enhances the stirring and mixing effects of the pickling liquid in the acid pickling tank, and makes the components of the pickling liquid in different parts more uniform, thereby avoiding the situation that the local pickling liquid is too high or too low in concentration, and effectively improving the uniformity of the pickling liquid.

[0018] Liquid outlet orientation design: Both liquid outlets are oriented towards the central axis direction of the pickling tank. This design allows the pickling liquid sprayed from the liquid outlets to flow towards the central area of the pickling tank, forming a convection, increasing the mixing and flow of the pickling liquid in the horizontal direction, helping the pickling liquid to be more evenly distributed in the pickling tank, and improving the uniformity of the pickling liquid.

[0019] The role of the stirring mechanism: The pickling tank is provided with a stirring mechanism. The output shaft of the stirring motor drives the L-shaped stirring rod to rotate, and the stirring rod is movably attached to the inner wall of the pickling tank. The rotation of the stirring rod stirs the pickling liquid, causing the pickling liquid to flow in the horizontal direction, further promoting the mixing between different parts of the pickling liquid. The multiple turbulence holes on the stirring rod can increase the turbulence of the pickling liquid during stirring, making the stirring of the pickling liquid more thorough, and effectively improving the uniformity of the pickling liquid.

[0020] Effect consistency based on pickling liquid uniformity improvement: The above-mentioned multiple designs improve the uniformity of the pickling liquid, so that the metal surface can be in full contact with the pickling liquid of uniform concentration during pickling. No matter where the metal surface is located in the pickling tank, it can be affected by the pickling liquid of the same concentration and properties, avoiding the situation that different parts of the metal surface are pickled to different degrees due to uneven concentration of the pickling liquid, thereby ensuring the consistency of the metal surface treatment effect.

[0021] Design advantage of the stirring rod attached to the inner wall of the pickling tank: The stirring rod is movably attached to the inner wall of the pickling tank, which can fully stir the pickling liquid near the inner wall of the pickling tank during stirring, avoiding the formation of a dead zone of pickling liquid flow near the inner wall of the pickling tank. This ensures that the parts of the metal surface in contact with the inner wall of the pickling tank also receive the same pickling treatment as other parts of the pickling tank, further ensuring the consistency of the surface treatment effect.

[0022] Anti-corrosion coating for effect consistency: The surfaces of the stirring rod, the bearing and the inner wall of the circulating pipe are coated with an anti-corrosion coating to prevent these components from being corroded during pickling and affecting their normal operation. The stirring rod and the circulating pipe and other components can continuously and stably perform the functions of stirring and circulating the pickling liquid, ensuring the long-term stability of the uniformity of the pickling liquid, and thus ensuring the consistency of the metal surface treatment effect. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0024] Figure 1The sectional view of the first embodiment of the utility model.

[0025] Figure 2 The sectional view of the second embodiment of the utility model.

[0026] In the figure: 1, pickling tank; 201, circulating pipe; 202, first circulating pump; 203, second circulating pump; 301, stirring motor; 302, stirring rod; 303, bearing; 304, spoiler hole. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0028] The first embodiment

[0029] As Figure 1 shown, a pickling device for metal surface treatment comprises a pickling tank 1, fluid circulation mechanisms are arranged on both sides in the pickling tank 1, and a stirring mechanism is arranged at the bottom of the pickling tank 1; the fluid circulation mechanisms comprise a circulating pipe 201 embedded in the side wall of the pickling tank 1, the circulating pipe 201 has one liquid inlet, the liquid inlet is located at the bottom of the pickling tank 1, the circulating pipe 201 has two liquid outlets, the two liquid outlets are located at the middle and upper part of the pickling tank 1, and the two liquid outlets are respectively provided with a first circulating pump 202 and a second circulating pump 203.

[0030] As Figure 1 shown, the fluid circulation mechanisms realize the circulating flow of pickling liquid through the circulating pipe 201. The liquid inlet of the circulating pipe 201 is arranged at the bottom of the pickling tank 1, and in the pickling process, the pickling liquid at the bottom of the pickling tank 1 may have relatively high concentration or poor flowability due to gravity and chemical reaction and other factors. The circulating pipe 201 sucks the pickling liquid at the bottom and then retransports it back into the pickling tank 1 through the two liquid outlets located at the middle and upper part of the pickling tank 1. The first circulating pump 202 and the second circulating pump 203 provide power for the flow of pickling liquid in the circulating pipe 201. Since the two liquid outlets are respectively provided with circulating pumps of different powers (the first circulating pump 202 is located above the second circulating pump 203 and has a power greater than that of the second circulating pump 203), the flow rates and flow volumes of the pickling liquid sprayed from the two liquid outlets are different. This differentiated spraying mode can promote the pickling liquid to form a complex and effective flow mode in the pickling tank 1, promote the mixing and exchange of the pickling liquid in the vertical direction, break the possible stratification or local concentration difference of the pickling liquid, and make the pickling liquid more uniformly distributed in the pickling tank 1.

[0031] As shown in Figure 1 , the stirring mechanism at the bottom of the pickling tank 1 further enhances the uniformity of the pickling solution. When the stirring mechanism is working, the stirring rod 302 rotates to produce stirring effect on the pickling solution, causing the pickling solution to flow in the horizontal direction. Combined with the circulation mechanism, which circulates the flow of the pickling solution in the vertical direction, the two work together to comprehensively promote the mixing and flow of the pickling solution in both horizontal and vertical dimensions. This synergistic effect can ensure that the pickling solution in the pickling tank 1 always remains uniform, regardless of the position of the metal surface in the pickling tank 1, it can fully contact with the pickling solution of uniform concentration and properties, thereby ensuring the consistency of the metal surface treatment effect, and achieving efficient metal surface pickling treatment.

[0032] As shown in Figure 1 , the first circulation pump 202 is located above the second circulation pump 203, and the output power of the first circulation pump 202 is greater than that of the second circulation pump 203. When the device is running, the first circulation pump 202 and the second circulation pump 203 respectively drive the pickling solution to be sprayed from the liquid outlets located in the middle and upper parts of the pickling tank 1. Since the first circulation pump 202 has greater output power, it drives the pickling solution to flow at a faster speed and with a larger flow rate; the second circulation pump 203 has smaller output power, and the pickling solution driven by it flows at a relatively slower speed and with a smaller flow rate. This differentiated design causes the pickling solution sprayed from the two liquid outlets to form a complex flow state in the pickling tank 1. The pickling solution with fast flow rate and large flow rate can quickly spread around, while the pickling solution with slow flow rate and small flow rate fills the space relatively slowly, and the two work together to produce a strong stirring and mixing effect in the pickling tank 1. On the one hand, it promotes the flow and exchange of the pickling solution in the vertical direction, so that the pickling solution with possibly higher concentration at the bottom fully mixes with the pickling solution in the middle and upper parts; on the other hand, combined with the design that both liquid outlets are directed towards the central axis direction of the pickling tank 1, it further enhances the convection of the pickling solution in the horizontal direction, breaks the possible stratification or local concentration difference of the pickling solution, and makes the pickling solution more uniformly distributed in the pickling tank 1.

[0033] As shown in Figure 1 , in the stirring mechanism, the stirring motor 301 is embedded in the bottom of the pickling tank 1, and its output shaft is connected with the bottom of the pickling tank 1 through a bearing 303, providing stable support for the rotation of the stirring rod 302. The stirring rod 302 is L-shaped and movably attached to the inner wall of the pickling tank 1, and when the stirring motor 301 is started, the output shaft drives the stirring rod 302 to rotate. The rotation of the stirring rod 302 produces a horizontal stirring effect on the pickling solution, causing the pickling solution to flow horizontally in the pickling tank 1, further promoting the mixing between different parts of the pickling solution. At the same time, the stirring rod 302 movably attaches to the inner wall of the pickling tank 1, which can effectively stir the pickling solution near the inner wall of the pickling tank 1, avoiding the formation of flow dead zones, and ensuring that the parts of the metal surface in contact with the inner wall of the pickling tank 1 can also be uniformly pickled.

[0034] As Figure 1 shown, the surface of the stirring rod 302, the surface of the bearing 303 and the inner wall of the circulation pipe 201 are coated with an anticorrosion coating. During the pickling process, the pickling solution has strong corrosive properties, which can cause corrosion to the metal parts in contact with it, affecting the service life and working performance of the parts. The anticorrosion coating can form a dense protective film on the surface of the metal parts, isolating the metal parts from the pickling solution and preventing the corrosive substances in the pickling solution from directly contacting the metal, thereby preventing the metal parts from being corroded. This can ensure that the stirring mechanism and fluid circulation mechanism and other components can operate stably for a long time, maintain the stability of the pickling solution uniformity, and thus ensure the consistency of the metal surface treatment effect.

[0035] Second embodiment

[0036] As Figure 2 shown, the stirring rod 302 is provided with a plurality of turbulence holes 304. When the stirring motor 301 drives the stirring rod 302 to rotate in the pickling tank 1, the stirring rod 302 itself will produce a stirring effect on the pickling solution, pushing the pickling solution to flow. The plurality of turbulence holes 304 provided on the stirring rod 302 further enhance this stirring effect. During the rotation of the stirring rod 302, the pickling solution will pass through these turbulence holes 304. Due to the presence of the turbulence holes 304, the flow direction and speed of the pickling solution will change when it passes through, forming local turbulence. This turbulence breaks the originally relatively stable flow state of the pickling solution, increasing the mixing degree of the pickling solution inside. The area of the pickling solution that may not be fully mixed due to the simple rotation of the stirring rod 302 can better exchange and mix with the pickling solution in other areas under the action of the turbulence generated by the turbulence holes 304. At the same time, the turbulence generated by the turbulence holes 304 also makes the contact between the pickling solution and the metal surface more sufficient and uniform. The pickling solution can more comprehensively cover the metal surface under the action of the turbulence, timely take away the substances generated by the reaction on the metal surface, and promote the progress of the pickling reaction, thereby helping to improve the uniformity of the pickling solution, ensuring the consistency of the metal surface treatment effect, and improving the quality and efficiency of the pickling treatment.

[0037] The above is only a specific embodiment of the present application, but the technical features of the present application are not limited to this. Any simple change, equivalent replacement or modification made on the basis of the present application to solve basically the same technical problem and achieve basically the same technical effect is covered by the protection scope of the present application.

Claims

1. An acid pickling device for metal surface treatment, comprising an acid pickling tank (1), characterized in that: The acid washing tank (1) is provided with fluid circulation mechanisms on both sides, and is provided with a stirring mechanism at the bottom; the fluid circulation mechanism comprises a circulation pipe (201) embedded in the side wall of the acid washing tank (1), the circulation pipe (201) has one liquid inlet, the liquid inlet is located at the bottom of the acid washing tank (1), the circulation pipe (201) has two liquid outlets, the two liquid outlets are located at the middle and upper part of the acid washing tank (1), and the two liquid outlets are respectively provided with a first circulation pump (202) and a second circulation pump (203).

2. The pickling device for metal surface treatment according to claim 1, characterized by: The first circulation pump (202) is located above the second circulation pump (203), and the output power of the first circulation pump (202) is greater than that of the second circulation pump (203).

3. The pickling device for metal surface treatment according to claim 2, characterized by: Both of the two liquid outlets are directed towards the central axis of the acid washing tank (1).

4. The pickling apparatus for metal surface treatment according to claim 1, characterized by: The stirring mechanism comprises a stirring motor (301) embedded in the bottom of the acid washing tank (1), the output shaft of the stirring motor (301) extends into the acid washing tank (1) and is provided with an L-shaped stirring rod (302) connected thereto, the stirring rod (302) is movably attached to the inner wall of the acid washing tank (1), and the output shaft of the stirring motor (301) is rotatably connected to the bottom of the acid washing tank (1) through a bearing (303).

5. The pickling device for metal surface treatment according to claim 4, characterized by: The surface of the stirring rod (302), the surface of the bearing (303) and the inner wall of the circulation pipe (201) are all coated with an anti-corrosion coating.

6. The pickling apparatus for metal surface treatment according to claim 5, characterized by: A plurality of turbulence holes (304) are formed in the stirring rod (302).

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