System for pretreatment process of steel product coating production line

Abstract

The utility model discloses a system for a pretreatment process of a steel product coating production line, which comprises a plurality of functional areas including a degreasing area, a washing area and a vitrification area; the transition areas and the water storage devices are arranged corresponding to the functional areas, the transition areas are located between the adjacent functional areas, and the water storage devices are communicated with the corresponding transition areas and the functional areas respectively. According to the utility model, the transition area and the water storage device are arranged between the adjacent functional areas, so that the phenomenon of'channeling 'is effectively reduced, and treating fluids with different chemical properties are prevented from being mixed with one another. Meanwhile, a pH detection device, a pH controller and a dosing device are respectively arranged in the degreasing area and the vitrification area, so that closed-loop control is formed, and the concentration of the solution in the medicament tank is monitored and adjusted.

Description

Technical Field

[0001] The utility model relates to the technical field of steel product coating, in particular to a system for a pre-treatment process of a steel product coating production line. Background Art

[0002] In the steel product coating production line, the pre-treatment process is the key link to ensure the coating quality. This process usually includes hot water washing, pre-degreasing, main degreasing, water washing, pure water washing and vitrification. However, in actual production, due to equipment limitations, there are two main problems: "tank cross-linking" and solution dilution.

[0003] 1. "String slot" problem:

[0004] Steel products are suspended on the carousel and pass through each process unit one by one as the line rotates. During the circulation of steel products, the residual water from cleaning in different areas cannot be cleaned up in time, and the steel products enter the next cleaning environment with the steel products themselves. This phenomenon is called "cross-tank" of chemical solution in the industry. The "cross-tank" phenomenon will cause the treatment solutions of different chemical properties to mix with each other.

[0005] "Cross-tank" mainly occurs between adjacent processes, especially between the degreasing tank and the ceramic tank, where the consequences are most obvious. Since the degreasing solution is alkaline (pH 9.5-11) and the ceramic solution is acidic (pH 4.5-5.5), their mixing will cause the agent to fail and the pH value to be out of control. This will directly lead to quality problems such as rust on the surface of steel products.

[0006] 2. Solution dilution problem:

[0007] As the number of steel products treated increases, the concentration of the solution in the reagent tank gradually decreases. The decrease in solution concentration directly affects the surface treatment quality of steel products and may lead to unstable treatment effects of subsequent steel products.

[0008] The existence of these two problems not only affects the treatment quality of steel products, but also causes waste of reagents and increases the burden of sewage treatment. Therefore, a solution is urgently needed that can effectively reduce the cross-tank phenomenon and maintain the concentration of the solution in each reagent tank, thereby ensuring the stability and efficiency of the pre-treatment process of steel products. Utility Model Content

[0009] The main purpose of the utility model is to provide a system for the pre-treatment process of a steel product coating production line, aiming to solve the problems of "tank cross-talk" and solution dilution existing in the prior art.

[0010] The purpose of the utility model can be achieved by adopting the following technical solutions:

[0011] A system for the pre-treatment process of a steel product coating production line, comprising:

[0012] Multiple functional areas, including a degreasing area, a water washing area, and a phosphatizing area;

[0013] Transition areas and water storage devices corresponding to each of the functional areas, where the transition areas are located between adjacent functional areas, and the water storage devices are respectively communicated with their corresponding transition areas and functional areas;

[0014] First pH detection devices respectively arranged in the degreasing area and the phosphatizing area;

[0015] A pH controller electrically connected to the first pH detection device;

[0016] A chemical dosing device electrically connected to the pH controller, used to add corresponding chemicals to the degreasing area and the phosphatizing area respectively.

[0017] Wherein, the water storage device is communicated with the transition area through a recovery pipeline and is communicated with the functional area through a reflux pipeline.

[0018] Wherein, first booster pumps are respectively arranged on the recovery pipeline and the reflux pipeline.

[0019] Wherein, the water storage device is connected with a waste water discharge pipeline, and a second booster pump is arranged on the waste water discharge pipeline.

[0020] Wherein, the degreasing area includes a pre - degreasing tank and a main degreasing tank arranged in sequence.

[0021] Wherein, the water washing area includes a first water washing area arranged at the front end of the degreasing area and a second water washing area arranged between the degreasing area and the phosphatizing area.

[0022] Wherein, a conductivity detection device is arranged in the water storage device communicated with the water washing area.

[0023] Wherein, second pH detection devices are respectively arranged in the water storage devices communicated with the degreasing area and the phosphatizing area.

[0024] Wherein, the system further includes a conveying device for passing steel products through each of the functional areas and the transition areas located between adjacent functional areas.

[0025] The beneficial technical effects of the present utility model:

[0026] The utility model effectively reduces the "channeling" phenomenon and prevents the mixing of treatment liquids with different chemical properties by arranging a transition area and a water storage device between adjacent functional areas. At the same time, by respectively arranging a pH detection device, a pH controller and a dosing device in the degreasing area and the phosphatizing area, a closed-loop control is formed, realizing the monitoring and adjustment of the solution concentration in the chemical agent tank. This design not only solves the "channeling" and solution dilution problems in the background technology, but also improves the recycling rate of the treatment liquid. Therefore, this system can improve the stability and efficiency of the pretreatment process of the steel product painting production line, and at the same time reduce the production cost required for chemical agents and the sewage treatment burden. Description of the Drawings

[0027] Figure 1 It is a schematic diagram of the system according to the embodiment of the utility model;

[0028] Figure 2 It is a schematic diagram of the pre-degreasing tank and the main degreasing tank of the system according to the embodiment of the utility model;

[0029] Figure 3 It is a schematic diagram of dosing in the degreasing area of the system according to the embodiment of the utility model;

[0030] Figure 4 It is a schematic diagram of dosing in the phosphatizing area of the system according to the embodiment of the utility model;

[0031] Figure 5 It is a schematic diagram of the degreasing area of the system according to the embodiment of the utility model;

[0032] Figure 6 It is a schematic diagram of the water washing area of the system according to the embodiment of the utility model;

[0033] Figure 7 It is a schematic diagram of the water storage device and the sewage treatment station of the system according to the embodiment of the utility model;

[0034] Figure 8 It is a schematic diagram of the water storage device of the system according to the embodiment of the utility model.

[0035] Description of the reference numerals:

[0036] In the figure: 10 - degreasing area, 11 - pre-degreasing tank, 12 - main degreasing tank, 20 - water washing area, 21 - first water washing area, 22 - second water washing area, 30 - phosphatizing area, 40 - transition area, 50 - water storage device, 51 - recovery pipeline, 52 - reflux pipeline, 53 - waste water discharge pipeline, 54 - sewage treatment station, 60 - first pH detection device, 61 - pH controller, 62 - dosing device, 70 - conductivity detection device, 80 - second pH detection device, 90 - conveying device. Detailed Embodiments

[0037] To make the technical solution of the present utility model clearer and more definite for those skilled in the art, the present utility model will be further described in detail below in conjunction with embodiments and the accompanying drawings. However, the implementation manners of the present utility model are not limited thereto.

[0038] As Figures 1-8 shown, the system for the pretreatment process of the steel product coating production line provided in this embodiment includes multiple functional areas, a transition area 40, a water storage device 50, a first pH detection device 60, a pH controller 61, and a chemical dosing device 62.

[0039] The functional areas include a degreasing area 10, a water washing area 20, and a phosphatizing area 30. These functional areas are arranged in sequence according to the requirements of the pretreatment process of the steel product coating production line and are used to clean and chemically treat the surface of the steel product.

[0040] The transition area 40 is arranged between adjacent functional areas and is used to collect the solution carried out by the steel product from the previous functional area, preventing this solution from entering the next functional area, thereby avoiding the phenomenon of cross-tank. A transition area 40 is correspondingly arranged for each functional area.

[0041] The water storage device 50 is respectively communicated with its corresponding transition area 40 and functional area. The water storage device 50 is used to temporarily store the solution collected by the transition area 40, so as to facilitate the reflux of this solution to this functional area and realize the recycling of the solution.

[0042] The first pH detection device 60 is respectively arranged in the degreasing area 10 and the phosphatizing area 30 and is used to monitor the pH value of the solution in these two functional areas. Specifically, a pH detection device is arranged in the degreasing area 10, and another pH detection device is arranged in the phosphatizing area 30.

[0043] This design can respectively monitor the pH values of the degreasing area 10 and the phosphatizing area 30 because the required pH value ranges of these two functional areas are different.

[0044] The pH controller 61 is electrically connected to these two first pH detection devices 60 and is used to receive the pH value information of the two functional areas and perform analysis and processing.

[0045] The chemical dosing device 62 is electrically connected to the pH controller 61 and, according to the instructions of the pH controller 61, adds corresponding chemicals to the degreasing area 10 and the phosphatizing area 30 respectively to maintain the pH value of their respective solutions within the process requirements.

[0046] In this embodiment, when the steel product passes through the corresponding functional area and before entering the next functional area, it will stay above the transition area 40 between these two functional areas for a certain period of time. This staying process enables the solution in the previous functional area carried by the steel product to fall into the transition area 40, effectively avoiding the problem of cross-tank caused by the solution in the previous functional area entering the next functional area.

[0047] In this embodiment, taking the degreasing area 10 and the water washing area 20 distributed front and back as an example, a transition area 40 is provided between them. A water storage device 50 is communicated with the transition area 40, and the water storage device 50 is also communicated with the degreasing area 10.

[0048] This design enables the steel product to pass through the transition area 40 between the degreasing area 10 and the water washing area 20 when moving from the degreasing area 10 to the water washing area 20. The transition area 40 collects the solution dropped from the steel product. The collected solution flows into the water storage device 50 communicated with it. The solution in the water storage device 50 can flow back to the degreasing area 10, thus realizing the recycling of the solution.

[0049] In this embodiment, there are two pH controllers 61 and two dosing devices 62, which are respectively used to add corresponding medicaments to the degreasing area 10 and the phosphatizing area 30. Specifically:

[0050] The dosing device 62 in the degreasing area 10 is used to add an alkaline medicament (such as a degreaser) to the degreasing area 10. When the pH value of the solution in the degreasing area 10 is lower than the set range (usually 9.5 - 11), the dosing device 62 adds an appropriate amount of alkaline medicament to the degreasing area 10 to maintain the alkalinity of the solution.

[0051] The dosing device 62 in the phosphatizing area 30 is used to add an acidic medicament (such as a phosphatizing agent) to the phosphatizing area 30. When the pH value of the solution in the phosphatizing area 30 is higher than the set range (usually 4.5 - 5.5), the dosing device 62 adds an appropriate amount of acidic medicament to the phosphatizing area 30 to maintain the acidity of the solution.

[0052] In one embodiment, the first pH detection device 60 adopts the sensor part of an industrial pH meter, that is, a pH electrode. The pH electrode can generate a corresponding weak voltage signal according to the acidity of the solution.

[0053] Electrically connected to the pH electrode is the controller part of the industrial pH meter, that is, the pH controller 61. The pH controller 61 can receive the weak voltage signal from the pH electrode, amplify and convert it into a standard 4 - 20mA current signal, then convert it into a digital signal for processing, and finally accurately display the pH value.

[0054] The dosing device 62 includes a precision dosing metering pump, which can adjust the dosing amount according to the output signal of the pH controller 61 (mainly a 4 - 20mA analog signal or a digital communication signal). For example, a 4mA signal can correspond to no dosing, a 20mA signal corresponds to the maximum dosing amount, and intermediate values correspond to different dosing values.

[0055] In one embodiment, the water storage device 50 is communicated with the transition area 40 through a recovery pipeline 51 and is communicated with the functional area through a reflux pipeline 52. This design makes the collection and reflux of the solution more controllable.

[0056] In this embodiment, in order to ensure the smooth flow of the solution, a first booster pump is respectively provided on the recovery pipeline 51 and the reflux pipeline 52. The first booster pump can overcome the pipeline resistance and the height difference to ensure that the solution can smoothly flow from the transition zone 40 to the water storage device 50 connected thereto, and reflux from the water storage device 50 to the functional zone connected thereto.

[0057] In one embodiment, the transition zone 40 adopts a funnel-shaped structure, the upper opening width is equivalent to the width of the functional zone tank body, and the lower part is narrowed and connected to the recovery pipeline 51.

[0058] In one embodiment, considering the need to discharge unqualified solution, the water storage device 50 is further connected with a waste water discharge pipeline 53, and this pipeline is communicated with an external sewage collection device. To ensure that the waste water discharge pipeline 53 can discharge the solution to the sewage collection device, a second booster pump is provided on this pipeline.

[0059] This design is mainly used in the following situations: when the solution in the water storage device 50 does not meet the reflux conditions (such as parameters such as pH value and conductivity exceed the allowable range), this solution can be discharged to the sewage treatment station 54. This can maintain the quality stability of the solution in the system.

[0060] In one embodiment, the water storage device is a tank structure, and simple pretreatment can be carried out on the recovered solution, such as allowing the solution to naturally precipitate to reduce the influence of possible impurities brought in on the solution in the functional zone.

[0061] In one embodiment, the degreasing zone 10 includes a pre-degreasing tank 11 and a main degreasing tank 12 arranged in sequence. According to the process requirements, the steel products are first pre-degreased and then main-degreased.

[0062] In this embodiment, for each of the two tanks of the pre-degreasing tank 11 and the main degreasing tank 12, there is a corresponding first pH detection device 60, a pH controller 61 and a dosing device 62 to accurately control the pH value of each tank.

[0063] In this embodiment, the water washing zone 20 includes a first water washing zone 21 provided at the front end of the degreasing zone 10, and a second water washing zone 22 provided between the degreasing zone 10 and the phosphatizing zone 30.

[0064] Specifically, the first water washing zone 21 includes a hot water tank, which is used to preliminarily clean the steel products entering the degreasing zone 10 and prepare for the degreasing process. The second water washing zone 22 includes two ordinary water washing tanks, which are used to clean the degreased steel products and prepare for the phosphatizing process.

[0065] In this embodiment, between the first water washing area 21 and the pre-degreasing tank 11, and between the main degreasing tank 12 and the second water washing area 22, a transition area 40 and a water storage device 50 are provided to prevent cross-tank between different functional areas. This design can effectively isolate solutions with different pH values and ensure the treatment effect of each process.

[0066] In one embodiment, a conductivity detection device 70 is provided in the water storage device 50 communicated with the water washing area 20. The conductivity detection device 70 can monitor the conductivity of the recycled solution in the water washing area 20 to ensure that the quality of the recycled water meets the requirements.

[0067] Specifically, when the conductivity of the solution in the water storage device 50 is lower than 1000 μS / cm, it indicates that the solution can be directly recycled. This not only saves water resources but also reduces the amount of wastewater to be treated.

[0068] When the conductivity is higher than 1000 μS / cm, the solution needs to be discharged to the sewage treatment station 54 instead of being recycled to the water washing area 20. This can ensure that the water quality in the water washing area 20 is always suitable, which is beneficial to maintaining the cleaning quality of steel products.

[0069] In this embodiment, the detection probe of the conductivity detection device 70 can adopt a two-electrode conductivity sensor of the InPro7001 / 120-VP model.

[0070] In one embodiment, second pH detection devices 80 are respectively provided in the water storage device 50 communicated with the degreasing area 10 and the phosphatizing area 30. The second pH detection devices 80 can monitor the pH value of the recycled solution to ensure that the recycled solution does not affect the solution concentration in the corresponding functional area. The pH value requirements of these two functional areas are different, so they need to be monitored separately.

[0071] Specifically, for the water storage device 50 communicated with the degreasing area 10:

[0072] When the pH value of the solution in the water storage device 50 is between 9.5 and 11, it indicates that the recycled degreasing solution still maintains an appropriate alkalinity and can be directly recycled to the degreasing area 10. This not only saves chemical agent resources but also reduces the amount of wastewater to be treated.

[0073] When the pH value is lower than 9.5, it means that the content of alkaline substances in the recycled solution is insufficient and it is not suitable to be directly recycled to the degreasing area 10. At this time, the batch of solution can be discharged to the sewage treatment station 54.

[0074] For the water storage device 50 communicated with the phosphatizing area 30:

[0075] When the pH value of the solution in the water storage device 50 is between 4.5 and 5.5, it indicates that the recycled phosphatizing solution maintains the correct acidity and can be directly recycled to the phosphatizing area 30.

[0076] When the pH value is higher than 5.5, it indicates that the content of acidic substances in the recycled solution is insufficient and it is not suitable for direct reflux to the phosphatizing area 30. At this time, the solution of this batch can be discharged to the sewage treatment station 54.

[0077] This design can ensure that the pH value of the solution refluxed to the degreasing area 10 or the phosphatizing area 30 is always within the process requirements, avoiding the impact on product quality due to sudden changes in pH value. At the same time, it maximizes the recycling rate of the solution, improving production efficiency and reducing environmental impact.

[0078] In this embodiment, the second pH detection device 80 uses an industrial pH meter, which includes a detection probe and a digital display converter (not shown in the attached drawing) that cooperate with each other. The detection probe is the pH electrode, which can generate corresponding weak voltage signals according to the acidity and alkalinity of the solution. The digital display converter can receive the weak voltage signals from the pH electrode and convert them into pH values for display.

[0079] In one embodiment, the system further includes a conveying device 90. The conveying device 90 is used to make the steel products pass through each functional area and the transition area 40 located between adjacent functional areas.

[0080] Specifically, the conveying device 90 can be a hanging conveyor chain (not shown in the attached drawing), and the steel products are suspended on the chain through hanging tools and move through each processing area with the chain.

[0081] The steel products pass through the hot water tank, the pre-degreasing tank 11, the main degreasing tank 12, the water washing tank and the phosphatizing area (tank) 30 in sequence through the conveying device 90. Between each functional area, the steel products will pass through the corresponding transition area 40, thus effectively reducing the occurrence of cross-tank phenomenon.

[0082] Based on the above embodiments, the working process of the system is as follows:

[0083] 1. The steel products enter each functional area for processing in sequence through the conveying device 90. The specific sequence is: hot water tank (the first water washing area 21), pre-degreasing tank 11, main degreasing tank 12, water washing tank (the second water washing area 22) and phosphatizing area 30.

[0084] 2. When the steel products leave one functional area and enter the next functional area, they will pass through the transition area 40 set between the two functional areas.

[0085] 3. The transition area 40 collects the solution dropped from the steel products. These solutions pass through the recovery pipeline 51 and can be transported to the corresponding water storage device 50 under the action of the first booster pump.

[0086] 4. The solution in the water storage device 50 can be naturally precipitated and then refluxed to the corresponding functional area through the reflux pipeline 52 to achieve the recycling of the solution. The specific treatment process is as follows:

[0087] For the recycled solution in the water washing area 20:

[0088] The conductivity detection device 70 monitors the conductivity of the solution in the corresponding water storage device 50;

[0089] If the conductivity is lower than 1000 μS / cm, the solution can be directly reused;

[0090] If the conductivity is higher than 1000 μS / cm, the solution will be discharged to the sewage treatment station 54 through the waste water discharge pipeline 53.

[0091] For the recycled solutions in the degreasing area 10 and the phosphatizing area 30:

[0092] The second pH detection device 80 monitors the pH values of the solutions in the corresponding water storage devices 50 respectively;

[0093] For the recycled solution corresponding to the degreasing area 10, if the pH value is between 9.5 - 11, it can be directly reused; if it is lower than 9.5, it can be optionally discharged to the sewage treatment station 54.

[0094] For the recycled solution corresponding to the phosphatizing area 30, if the pH value is between 4.5 - 5.5, it can be directly reused; if it is higher than 5.5, it can be optionally discharged to the sewage treatment station 54.

[0095] 5. The first pH detection devices 60 set in the degreasing area 10 and the phosphatizing area 30 respectively monitor the pH values of the solutions in these two functional areas and transmit the data to the corresponding pH controllers 61.

[0096] 6. The pH controller 61 controls the dosing device 62 to add appropriate agents to the degreasing area 10 or the phosphatizing area 30 respectively according to the received pH value information of different functional areas to maintain the pH values of their respective solutions within a suitable range. The pH value of the degreasing area is usually maintained between 9.5 - 11, and the pH value of the phosphatizing area is usually maintained between 4.5 - 5.5.

[0097] 7. During the whole process, the conveying device 90 runs continuously to ensure that the steel products pass through each processing area in sequence according to the predetermined path and time.

[0098] The system effectively reduces the phenomenon of slot cross - flow through the transition zone and its corresponding water - storage device, improves the coating quality of steel products, and at the same time realizes the efficient utilization of the solution through solution circulation, reducing production costs and environmental pollution. In addition, the system controls the dosing device 62 to add corresponding chemicals by monitoring the pH values of the solutions in the degreasing zone 10 and the phosphatizing zone 30 respectively, avoiding the dilution of the solutions during the processing of steel products, thereby ensuring the stability of the pretreatment process of the steel product coating production line.

[0099] As described above, it is only a further embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the scope disclosed by the present utility model, according to the technical solution and its concept of the present utility model, makes equivalent replacements or changes, all belong to the protection scope of the present utility model.

Claims

1. A system for the pretreatment process of a steel product painting production line, characterized in that, Comprising: A plurality of functional zones, which include a degreasing zone (10), a water washing zone (20) and a phosphatizing zone (30); A transition zone (40) and a water storage device (50) correspondingly arranged for each of the functional zones, wherein the transition zone (40) is located between adjacent functional zones, and the water storage device (50) is respectively communicated with the corresponding transition zone (40) and functional zone; A first pH detection device (60) respectively arranged in the degreasing zone (10) and the phosphatizing zone (30); A pH controller (61) electrically connected to the first pH detection device (60); A chemical dosing device (62) electrically connected to the pH controller (61), for adding corresponding chemicals to the degreasing zone (10) and the phosphatizing zone (30) respectively.

2. The system for the pretreatment process of the steel product painting production line according to claim 1, characterized in that, The water storage device (50) is communicated with the transition zone (40) through a recovery pipeline (51) and is communicated with the functional zone through a reflux pipeline (52).

3. The system for the pretreatment process of the steel product painting production line according to claim 2, characterized in that, First booster pumps are respectively arranged on the recovery pipeline (51) and the reflux pipeline (52).

4. The system for the pretreatment process of the steel product painting production line according to claim 3, wherein, The water storage device (50) is connected with a waste water discharge pipeline (53), and a second booster pump is arranged on the waste water discharge pipeline (53).

5. The system for the pretreatment process of the steel product painting production line according to claim 1, characterized in that, The degreasing zone (10) includes a pre-degreasing tank (11) and a main degreasing tank (12) arranged in sequence.

6. The system for the pretreatment process of the steel product painting production line according to claim 1, characterized in that, The water washing zone (20) includes a first water washing zone (21) arranged at the front end of the degreasing zone (10) and a second water washing zone (22) arranged between the degreasing zone (10) and the phosphatizing zone (30).

7. The system for the pretreatment process of the steel product painting production line according to claim 1, characterized in that, A conductivity detection device (70) is arranged in the water storage device (50) communicated with the water washing zone (20).

8. The system for the pretreatment process of the steel product painting production line according to claim 1, characterized in that, Second pH detection devices (80) are respectively arranged in the water storage devices (50) communicated with the degreasing zone (10) and the phosphatizing zone (30).

9. The system for the pretreatment process of the steel product painting production line according to any one of claims 1-8, characterized in that, The system further includes a conveying device (90) for enabling the steel products to pass through each of the functional zones and the transition zone (40) located between adjacent functional zones.

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