Pickling and passivating cleaning tank
By designing a multi-tank structure and recycling system for the pickling and passivation cleaning tank, the problems of pickling solution not being reusable and debris accumulation were solved, realizing the recycling of pickling solution and the recovery of iron filings, thus improving the efficiency and resource utilization of the cleaning tank.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI LANHUA CLEANING TECHNOLOGY CO LTD
- Filing Date
- 2025-08-11
- Publication Date
- 2026-06-23
AI Technical Summary
In the long term, existing pickling and passivation cleaning tanks tend to accumulate debris at the bottom, requiring regular cleaning. Furthermore, the pickling solution cannot be reused, resulting in low efficiency and waste of resources.
A pickling and passivation cleaning tank was designed, comprising a pickling tank, a passivation tank, a neutralization tank, and a final cleaning tank. It is connected to a waste liquid tank through a pipe to realize the recycling of pickling solution and the collection of debris. Fluoroplastic centrifugal pumps and solenoid valves are used to filter the pickling solution and separate debris, enabling the pickling solution to be used multiple times and the iron filings to be recycled.
It improves the service life of pickling tanks, reduces manual intervention steps, realizes the recycling rate of pickling solution, and enables the recycling of pickling solution and iron filings, thereby reducing resource waste.
Smart Images
Figure CN224395036U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of pickling and passivation technology, specifically to a pickling and passivation cleaning tank. Background Technology
[0002] Pickling and passivation is a chemical reaction used to remove rust from the surface of steel. After treatment, the surface becomes uniformly silvery-white, greatly improving its corrosion resistance. The design of pickling and passivation cleaning tanks needs to comprehensively consider chemical processes, material corrosion resistance, and safety and environmental protection requirements.
[0003] Currently, pickling solutions in pickling and passivation cleaning tanks tend to accumulate a lot of debris at the bottom during long-term use, requiring regular cleaning and replacement of the acid solution. Existing cleaning methods mostly involve draining the pickling solution, manually cleaning the debris, and then adding new pickling solution. This method is inefficient, and the pickling solution cannot be reused, resulting in waste. Furthermore, the debris may contain iron filings, which can be recycled, and direct disposal would be a waste of resources. Utility Model Content
[0004] The purpose of this invention is to provide an acid pickling and passivation cleaning tank to solve the problems mentioned in the background art.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a pickling and passivation cleaning tank, comprising an outer shell, an pickling tank disposed inside the outer shell, a first cleaning tank disposed at one end of the pickling tank, a passivation tank disposed on one side of the first cleaning tank, a second cleaning tank disposed at one end of the passivation tank, a neutralization tank disposed on one side of the second cleaning tank, a final cleaning tank disposed at one end of the neutralization tank, a bottom plate disposed at the bottom end of the pickling tank, a through pipe disposed at the middle position of the bottom end of the bottom plate, a waste liquid tank disposed at one end of the through pipe, a vertical pipe disposed at the bottom of the through pipe, a debris collection box disposed at the bottom end of the vertical pipe, a conveying pipe disposed at the bottom end of the waste liquid tank, and one end of the conveying pipe connected to the upper part of one end of the pickling tank.
[0006] Preferably, the bottom of the outer shell is provided with a base frame, which supports the outer shell and provides a certain space at the bottom of the outer shell for easy maintenance. The bottom of the waste liquid tank is provided with support feet at the four corners, which support the waste liquid tank. The top of the waste liquid tank is hinged with two top covers, which seal the top of the waste liquid tank to prevent waste liquid from splashing out. The top covers can be opened to allow the waste liquid to be added to solvent for purification.
[0007] Preferably, one end of the conveying pipe extends into the waste liquid tank, and a fluoroplastic centrifugal pump is provided at the extended end of the conveying pipe. The impeller and pump casing of the fluoroplastic centrifugal pump are coated with PVDF or PFA to resist strong acids, which is simple to maintain and has low cost. When it is necessary to transport the pickling solution in the waste liquid tank to the pickling tank, the fluoroplastic centrifugal pump draws the pickling solution in the waste liquid tank and transports it to the pickling tank through the conveying pipe.
[0008] Preferably, a filter plate is installed inside the through pipe near the vertical pipe, a water pump is installed inside the through pipe near the waste liquid tank, and a solenoid valve is installed inside the through pipe near the pickling tank. When the solenoid valve inside the through pipe is opened, the pickling liquid in the pickling tank can be drawn out by the water pump. The pickling liquid carries debris and flows inside the through pipe. The debris is blocked by the filter plate, and the filtered pickling liquid is transported to the waste liquid tank.
[0009] Preferably, the debris collection box is equipped with a separation plate inside, and a connecting pipe port is provided at the bottom of the debris collection box. A solenoid valve is provided inside the connecting pipe port. The blocked debris will settle inside the debris collection box. When it is necessary to remove the debris, the vertical pipe and the through pipe are disconnected. Then, the collection box is installed at the position of the connecting pipe port, and the solenoid valve of the connecting pipe port is opened. At this time, the liquid inside the debris collection box is discharged through the connecting pipe port, and the debris is blocked by the separation plate and remains inside the debris collection box.
[0010] Preferably, a cover is detachably installed on one side of the debris collection box. After the liquid inside the debris collection box is completely drained, the cover is opened to remove the debris, and the iron filings are quickly separated by an electromagnetic separator for collection and recycling.
[0011] Compared with the prior art, the beneficial effects of this utility model are:
[0012] 1. The pickling and passivation cleaning tank of this utility model has a waste liquid tank set at one end of the pickling tank. The waste liquid tank is connected to the bottom of the pickling tank through a pipe. After the pickling solution inside the pickling tank is used multiple times, it can be filtered through the pipe and transported to the waste liquid tank. By adding a neutralizing agent, the acidity of the pickling solution is restored to a predetermined value and then transported back to the pickling tank. This allows the debris deposited at the bottom of the pickling tank to be cleaned in time, improving the service life of the pickling tank. At the same time, the pickling solution is circulated, extending the service life of the acid solution, reducing manual intervention steps, and reducing the time required for pickling.
[0013] 2. The pickling and passivation cleaning tank of this utility model has a vertical pipe at the bottom of the through pipe, and a debris collection box is set at the bottom of the vertical pipe. The debris collection box collects and stores the debris inside the box. After filtration, the debris is collected. The collected debris can be quickly separated into iron filings by an electromagnetic separator. The iron filings are collected and recycled, improving the resource utilization rate. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0015] Figure 2 This is a schematic cross-sectional view of the pickling tank and waste liquid tank structure of this utility model.
[0016] Figure 3 This is a cross-sectional schematic diagram of the pipe and debris collection box structure of this utility model.
[0017] In the diagram: 1. Outer shell; 2. Final cleaning tank; 3. Neutralization tank; 4. Second cleaning tank; 5. Passivation tank; 6. First cleaning tank; 7. Pickling tank; 8. Top cover; 9. Waste liquid tank; 10. Support legs; 11. Base frame; 12. Fluoroplastic centrifugal pump; 13. Vertical pipe; 14. Debris collection box; 15. Connecting pipe port; 16. Cover; 17. Through pipe; 18. Base plate; 19. Conveying pipe; 20. Separation plate; 21. Filter plate. Detailed Implementation
[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0019] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0020] like Figures 1 to 3As shown, the pickling and passivation cleaning tank in this embodiment includes a shell 1. Inside the shell 1 is a pickling tank 7 containing pickling solution for removing metal oxides (such as rust and scale). A first cleaning tank 6 is located at one end of the pickling tank 7. After the material is pickled in the pickling tank 7, it is moved to the first cleaning tank 6 by a robotic arm. The material is then thoroughly rinsed with clean water to remove any remaining pickling solution and prevent contamination of the passivation solution. A passivation tank 5 is located on one side of the first cleaning tank 6. The cleaned material is then transported to the passivation tank 5, where a passivation solution is applied to the clean surface to form a passivation layer. The passivation tank 5 has a second cleaning tank 4 at one end. After passivation, the material is transported to the second cleaning tank 4 to remove any passivation solution residue and prevent impurities from being introduced during the neutralization stage. A neutralization tank 3 is located on one side of the second cleaning tank 4. Sodium carbonate neutralizing agent is added to the neutralization tank 3 to eliminate any residual acidic or alkaline substances on the material surface and prevent corrosion. A final cleaning tank 2 is located at one end of the neutralization tank 3. Finally, the material is transported to the final cleaning tank 2 and rinsed with pure water to ensure no residual chemicals remain on the surface. A bottom plate 18 is located at the bottom of the pickling tank 7. A through-pipe 17 is installed at the middle of the end. A solenoid valve is installed inside the through-pipe 17 near the bottom plate 18. When the pickling solution inside the pickling tank 7 needs to be replaced, the solenoid valve of the through-pipe 17 is opened, and the pickling solution inside the pickling tank 7 is discharged through the through-pipe 17. A waste liquid tank 9 is installed at one end of the through-pipe 17, and the pickling solution inside the pickling tank 7 is transported to the waste liquid tank 9 through the through-pipe 17. A vertical pipe 13 is installed at the bottom of the through-pipe 17. When the pickling solution flows inside the through-pipe 17, debris in the pickling solution will enter the vertical pipe 13. A debris collection box 1 is installed at the bottom of the vertical pipe 13. 4. The debris falls into the debris collection box 14 through the vertical pipe 13 for storage. The collected debris can be taken out and the iron filings are quickly separated by an electromagnetic separator. The iron filings are collected for recycling. A conveying pipe 19 is provided at the bottom of the waste liquid tank 9. The pickling solution is filtered and stored in the waste liquid tank 9. Then, sodium bicarbonate neutralizer is added to the waste liquid tank 9 to make the acidity of the liquid reach a predetermined value. One end of the conveying pipe 19 is connected to the upper part of one end of the pickling tank 7. When the pickling solution reaches the predetermined value, the pickling solution is conveyed to the pickling tank 7 through the conveying pipe 19 to complete the pickling solution circulation.
[0021] Specifically, a base frame 11 is provided at the bottom of the outer shell 1, which supports the outer shell 1 and provides a certain space at the bottom of the outer shell 1 for easy maintenance. Support legs 10 are provided at the four corners of the bottom of the waste liquid tank 9 to support the waste liquid tank. Two top covers 8 are hinged to the top of the waste liquid tank 9 to seal the top of the waste liquid tank 9 and prevent the waste liquid from splashing out. The top covers 8 can be opened to allow the waste liquid to be added to solvent for purification.
[0022] Furthermore, one end of the conveying pipe 19 extends into the waste liquid tank 9, and a fluoroplastic centrifugal pump 12 is installed at the extended end of the conveying pipe 19. The impeller and pump casing of the fluoroplastic centrifugal pump 12 are coated with PVDF or PFA to resist strong acids, which is simple to maintain and has a low cost. When it is necessary to transport the pickling solution in the waste liquid tank 9 to the pickling tank 7, the fluoroplastic centrifugal pump 12 draws the pickling solution in the waste liquid tank 9 and transports it to the pickling tank 7 through the conveying pipe 19.
[0023] Furthermore, a filter plate 21 is installed inside the through pipe 17 near the vertical pipe 13, a water pump is installed inside the through pipe 17 near the waste liquid tank 9, and a solenoid valve is installed inside the through pipe 17 near the pickling tank 7. When the solenoid valve inside the through pipe 17 is opened, the pickling liquid in the pickling tank 7 can be drawn out by the water pump. The pickling liquid carries debris and flows inside the through pipe 17. The debris will be blocked by the filter plate 21, and the filtered pickling liquid will be transported to the waste liquid tank 9.
[0024] Furthermore, the debris collection box 14 is equipped with a separation plate 20 inside, and a connecting pipe port 15 is provided at the bottom of the debris collection box 14. A solenoid valve is provided inside the connecting pipe port 15. The blocked debris will settle inside the debris collection box 14. When the debris needs to be removed, the vertical pipe 13 and the through pipe 17 are disconnected. Then, the collection box is installed at the position of the connecting pipe port 15, and the solenoid valve of the connecting pipe port 15 is opened. At this time, the liquid inside the debris collection box 14 is discharged through the connecting pipe port 15, and the debris is blocked by the separation plate 20 and remains inside the debris collection box 14.
[0025] Furthermore, a cover 16 is detachably installed on one side of the debris collection box 14. After the liquid inside the debris collection box 14 is completely drained, the cover 16 is opened to remove the debris, and the iron filings are quickly separated by an electromagnetic separator and collected for recycling.
[0026] The usage method of this embodiment is as follows: When using the pickling and passivation cleaning tank, the material is driven by a robotic arm to first immerse it in the pickling tank 7 to remove metal oxides (such as rust and scale). The material is then moved by the robotic arm to the first cleaning tank 6, where it is thoroughly rinsed with clean water to remove any remaining pickling solution and prevent contamination of the passivation solution. After cleaning, the material is transported to the passivation tank 5, where a passivation film is formed on the clean surface using the passivation solution. After passivation, the material is transported to the second cleaning tank 4 to remove any remaining passivation solution and prevent the introduction of impurities during the neutralization stage. After cleaning, the material is transported to the neutralization tank 3 to eliminate any residual acidic or alkaline substances on the material surface and prevent corrosion. Finally, the material is transported to the final cleaning tank 2 and rinsed with pure water to ensure no residual chemicals remain on the surface. The pickling solution in the pickling tank 7 needs to be replaced after multiple uses. At this time, the solenoid valve of the connecting pipe 17 is opened to drain the pickling solution from the pickling tank 7 through the connecting pipe 17. The pickling solution is transported to the waste liquid tank 9 through the pipe 17. The pickling solution carries debris and flows inside the pipe 17. The debris is blocked by the filter plate 21 and deposited into the debris collection box 14. When the debris needs to be removed, the vertical pipe 13 is disconnected from the pipe 17. Then, the collection box is installed at the connection port 15 and the solenoid valve of the connection port 15 is opened. At this time, the liquid inside the debris collection box 14 is discharged through the connection port 15. After the liquid inside the debris collection box 14 is completely discharged, the cover 16 is opened and the debris is taken out. The iron filings are quickly separated by an electromagnetic separator and collected for recycling. The filtered pickling solution is transported to the waste liquid tank 9. The pickling solution is stored in the waste liquid tank 9 after filtration. Then, sodium bicarbonate neutralizer is added to the waste liquid tank 9 to make the acidity of the liquid reach a predetermined value. When the pickling solution reaches the predetermined value, it is transported to the pickling tank 7 through the conveying pipe 19 to complete the pickling solution circulation.
[0027] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A pickling and passivation cleaning tank, comprising a shell (1), characterized in that: The shell (1) is provided with an acid pickling tank (7) inside. A first cleaning tank (6) is provided at one end of the acid pickling tank (7). A passivation tank (5) is provided on one side of the first cleaning tank (6). A second cleaning tank (4) is provided at one end of the passivation tank (5). A neutralization tank (3) is provided on one side of the second cleaning tank (4). A final cleaning tank (2) is provided at one end of the neutralization tank (3). A bottom plate (18) is provided at the bottom end of the acid pickling tank (7). A through pipe (17) is provided at the middle position of the bottom end of the bottom plate (18). A waste liquid tank (9) is provided at one end of the through pipe (17). A vertical pipe (13) is provided at the bottom of the through pipe (17). A debris collection box (14) is provided at the bottom end of the vertical pipe (13). A conveying pipe (19) is provided at the bottom end of the waste liquid tank (9). One end of the conveying pipe (19) is connected to the upper part of one end of the acid pickling tank (7).
2. The pickling and passivation cleaning tank according to claim 1, characterized in that: The bottom of the outer shell (1) is provided with a base frame (11), and the bottom of the waste liquid tank (9) is provided with four corner supports (10). The top of the waste liquid tank (9) is hinged with two top covers (8).
3. The pickling and passivation cleaning tank according to claim 1, characterized in that: One end of the conveying pipe (19) extends into the waste liquid tank (9), and a fluoroplastic centrifugal pump (12) is provided at the extended end of the conveying pipe (19).
4. The pickling and passivation cleaning tank according to claim 1, characterized in that: A filter plate (21) is provided inside the through pipe (17) near the vertical pipe (13).
5. The pickling and passivation cleaning tank according to claim 1, characterized in that: The debris collection box (14) is equipped with a separation plate (20) inside, and a connecting pipe port (15) is provided at the bottom end of the debris collection box (14).
6. The pickling and passivation cleaning tank according to claim 1, characterized in that: The debris collection box (14) has a detachable cover (16) on one side.