Full-automatic stainless steel aviation conduit pickling and passivating production system and production process thereof

Abstract

The invention relates to the field of surface treatment, in particular to a full-automatic stainless steel aviation conduit pickling and passivating production system and a production process thereof.The production system comprises a production line data acquisition layer, a system program control layer and a process route setting layer, and the production process comprises the following specific steps that A, inspection is conducted before pickling and passivating; b, preparation before pickling and passivation; c, pre-starting the system; d, full-automatic pickling and passivating treatment; on the basis of a full-automatic stainless steel aviation conduit pickling and passivating production system, large-batch and continuous production of stainless steel aviation conduits can be achieved, the production quality, production efficiency, energy conservation, environmental protection and the like are far better than those of an existing manual pickling and passivating technology, and the problem that the conduit pickling and passivating efficiency is low in the aviation repair process is solved; and the automation level of aviation equipment surface treatment is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of surface treatment, in particular to a fully automatic stainless steel aviation conduit pickling and passivation production system and a production process thereof. Background Art

[0002] Stainless steel conduits are widely used in aircraft hydraulic systems, and their surface quality has a significant impact on aircraft performance. To ensure that the conduits have good corrosion resistance, they are often treated with pickling and passivation before bending.

[0003] The number of stainless steel conduits used in aircraft is huge, and traditional manual production lines are difficult to meet the growing demand for repair tasks. Manual operations have the problems of high labor intensity, insufficient quality stability and consistency. In addition, the passivation solution components contain a certain proportion of nitric acid, and the tank liquid is prone to sputtering during the entry and exit of large-sized conduits, which poses certain safety risks. The present invention provides an automated pickling and passivation technology for stainless steel aviation conduits and its application, and combines intelligent network control and intelligent production management key technologies to form a fully automatic pickling and passivation production technology capability for aircraft equipment repair stainless steel conduits. Summary of the invention

[0004] In order to solve the above problems, the present invention proposes a fully automatic stainless steel aviation catheter pickling and passivation production system and a production process thereof.

[0005] A fully automatic stainless steel aviation catheter pickling and passivation production system includes a production line data acquisition layer, a system program control layer and a process route setting layer, as follows:

[0006] The production line data acquisition layer is used to receive instructions from the upper-level program control layer and control the load;

[0007] System program control layer, to realize the process parameter setting, control and monitoring of the production line;

[0008] At the process route setting layer, we conduct traceability inquiries on product quality and maintain strict archival records of product materials, processes, procedures, and product flows.

[0009] A production process of a fully automatic stainless steel aviation catheter pickling and passivation production system, the specific steps are as follows:

[0010] A. Inspection before pickling and passivation:

[0011] A1: Check the catheter lumen for excess material;

[0012] A2: Check the surface of the catheter for deformation, mechanical scratches, cracks, pits and other damage.

[0013] B. Preparation before pickling and passivation:

[0014] B1: Check that the composition of the tank liquid in each tank meets the requirements, and that the water, electricity and gas meet the requirements;

[0015] B2: Check the equipment status of the fully automatic pickling and passivation system and the integrity of its configured instruments;

[0016] B3: Check the integrity of the catheter hanging basket;

[0017] B4: Place the stainless steel conduits evenly in a special hanging basket, with the conduits tilted 10° to the horizontal direction, and place the special hanging basket loaded with stainless steel conduits in the loading and hanging area;

[0018] C. System pre-start:

[0019] C1: Start the main power supply and open the PLC control panel;

[0020] C2: Log in to the user account, enter the process page, select the "catheter passivation" process, and start the stirring and heating switches;

[0021] C3: Enter the monitoring page to check whether the driving group is waiting in the loading and hanging area, whether the tank liquid has reached the temperature, and whether there is any error message. After confirming that everything is ready, proceed to the next step;

[0022] D. Fully automatic pickling and passivation treatment:

[0023] D1: Click the "Total Start" switch on the PLC control page, and the basket will be automatically lifted through the automatic linkage of two single-arm cranes. Each lifting has an inclination angle to facilitate the drainage of liquid from the pipe;

[0024] D2: Chemical degreasing: the driving group hoists the hanging basket into the chemical degreasing tank for chemical degreasing. During the degreasing process, the ultrasonic system is always on;

[0025] The tank liquid formula in the chemical degreasing tank is: sodium hydroxide, sodium carbonate, sodium phosphate, sodium silicate;

[0026] Degreasing temperature: 80℃;

[0027] Degreasing time: 10min;

[0028] D3: Wash with flowing hot water. The basket after chemical degreasing is hoisted into the hot water tank and washed with flowing hot water. During the process, the ultrasonic system is always on.

[0029] Among them, hot water temperature: 50℃;

[0030] Cleaning time: 2min;

[0031] D4: Wash with flowing cold water. The hanging basket after washing with flowing hot water is hoisted into the cold water tank for washing with flowing cold water. During the process, the ultrasonic system is always on.

[0032] Among them, cold water temperature: room temperature;

[0033] Cleaning time: 2min;

[0034] D5: Pipe pickling: After being washed with running cold water, the hanging basket is hoisted into the pipe pickling tank for pickling;

[0035] The bath solution formula in the catheter pickling tank is: sulfuric acid, nitric acid, hydrofluoric acid, sodium chloride, OP emulsifier;

[0036] Temperature: room temperature;

[0037] Time: 1-10min;

[0038] D6: Wash with running cold water, put the pickled hanging basket into the cold water tank for washing with running cold water;

[0039] Among them, cold water temperature: room temperature;

[0040] Cleaning time: 2min;

[0041] D7: Chemical passivation, the hanging basket washed with flowing cold water is hoisted into the catheter passivation tank for passivation;

[0042] The bath solution formula in the chemical passivation tank is: nitric acid, potassium dichromate;

[0043] Temperature: 50℃;

[0044] Time: 30 minutes;

[0045] D8: Wash with flowing cold water. The hanging basket after chemical passivation is hoisted into the cold water tank for washing with flowing cold water.

[0046] Among them, cold water temperature: room temperature;

[0047] Cleaning time: 2min;

[0048] D9: Neutralization: After washing with running cold water, the hanging basket is hoisted into the neutralization tank for neutralization to neutralize any residual acid;

[0049] Wherein, the formula of the tank liquid in the neutralization tank is: sodium carbonate;

[0050] Temperature: room temperature;

[0051] Time: 1min;

[0052] D10: Wash with running cold water. Put the neutralized hanging basket into the cold water tank for washing with running cold water.

[0053] Among them, cold water temperature: room temperature;

[0054] Cleaning time: 2min;

[0055] D11: Pure water washing, hang the hanging basket after running cold water washing into the pure water tank for washing;

[0056] Among them, pure water temperature: 70℃;

[0057] Cleaning time: 2min;

[0058] D12: Drying: Hang the hanging basket after pure water washing into the hot air tank for hot air drying;

[0059] Wherein, drying temperature: 60℃;

[0060] Time: 30 minutes.

[0061] The single-arm crane of D1 adopts laser positioning.

[0062] The beneficial effects of the present invention are as follows: based on the fully automatic stainless steel aviation catheter pickling and passivation production system, large-scale and continuous production of stainless steel aviation catheters can be achieved, which far exceeds the existing manual pickling and passivation technology in terms of product quality, production efficiency, energy saving and environmental protection, solves the problem of low efficiency of catheter pickling and passivation in the aviation repair process, and greatly improves the level of automation of aviation equipment surface treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0064] Figure 1 It is a schematic diagram of the process structure of the present invention. DETAILED DESCRIPTION

[0065] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below.

[0066] like Figure 1 As shown in the figure, a fully automatic stainless steel aviation catheter pickling and passivation production system includes a production line data acquisition layer, a system program control layer and a process route setting layer, as follows:

[0067] The production line data acquisition layer is used to receive instructions from the upper-level program control layer and control the load to complete the production operation as set;

[0068] The system program control layer realizes the process parameter setting, control and monitoring of the production line, making the automated production line management orderly;

[0069] At the process route setting layer, we conduct traceability inquiries on product quality and maintain strict archival records of product materials, processes, procedures, and product flows to ensure the unity and integrity of all product elements.

[0070] The upper program control layer is a computer.

[0071] The production line data acquisition layer includes each plating tank and the load components on the plating tank at the production site, realizing direct control of the production line, and real-time positioning of the laser positioning linkage crane, plating tank liquid temperature, plating tank liquid level, and plating tank water supply and drainage valve status.

[0072] The plating tanks are degreasing tanks, water washing tanks, pickling tanks, passivation tanks, pure water tanks, and hot air tanks. The electroplating tanks are all chemical processes such as chemical oxidation and passivation reactions, and there are no electrochemical reactions. Therefore, the overall system control is relatively simple, the process flow is relatively simple, the cost of infrastructure construction and information system establishment is relatively low, and it has good production efficiency and economic benefits.

[0073] The load components are sensors, single-arm cranes, circulating pumps, rectifiers, water pipes, thermocouples, liquid level gauges, and steam pipes.

[0074] The process route setting layer includes a PLC control center, an output terminal, and a database, and is responsible for the preparation of process routes and the setting of process parameters, the collection and processing of process data, the production of process data reports, and the traceability query of product quality.

[0075] A production process of a fully automatic stainless steel aviation catheter pickling and passivation production system, the specific steps are as follows:

[0076] A. Inspection before pickling and passivation:

[0077] A1: Check the catheter lumen for excess material;

[0078] A2: Check the surface of the catheter for deformation, mechanical scratches, cracks, pits and other damage.

[0079] B. Preparation before pickling and passivation:

[0080] B1: Check that the composition of the tank liquid in each tank meets the requirements, and that the water, electricity and gas meet the requirements;

[0081] B2: Check the equipment status of the fully automatic pickling and passivation system and the integrity of its configured instruments;

[0082] B3: Check the integrity of the catheter hanging basket;

[0083] B4: Place the stainless steel conduits evenly in a special hanging basket, with the conduits tilted 10° to the horizontal direction, and place the special hanging basket loaded with stainless steel conduits in the loading and hanging area;

[0084] C. System pre-start:

[0085] C1: Start the main power supply and open the PLC control panel;

[0086] C2: Log in to the user account, enter the process page, select the "catheter passivation" process, and start the stirring and heating switches;

[0087] C3: Enter the monitoring page to check whether the driving group is waiting in the loading and hanging area, whether the tank liquid has reached the temperature, and whether there is any error message. After confirming that everything is ready, proceed to the next step;

[0088] D. Fully automatic pickling and passivation treatment:

[0089] D1: Click the "Total Start" switch on the PLC control page, and the basket will be automatically lifted through the automatic linkage of two single-arm cranes. Each lifting has an inclination angle to facilitate the drainage of liquid from the pipe;

[0090] D2: Chemical degreasing: the driving group hoists the hanging basket into the chemical degreasing tank for chemical degreasing. During the degreasing process, the ultrasonic system is always on;

[0091] The tank liquid formula in the chemical degreasing tank is: sodium hydroxide, sodium carbonate, sodium phosphate, sodium silicate;

[0092] Degreasing temperature: 80℃;

[0093] Degreasing time: 10min;

[0094] The temperature is set according to production experience and saponification mechanism, and the degreasing temperature can fully meet the production efficiency requirements; when the temperature is higher, although it can improve the solubility of the saponification product, increase the saponification and emulsification reaction speed, speed up the circulation of the solution, reduce the viscosity of the oily substance, and strengthen the convection of the degreasing solution, but when the temperature is too high, the energy consumption will increase greatly, the solution will evaporate faster, which is not conducive to the indoor environment and safe operation;

[0095] D3: Wash with flowing hot water. The basket after chemical degreasing is hoisted into the hot water tank and washed with flowing hot water. During the process, the ultrasonic system is always on.

[0096] Among them, hot water temperature: 50℃;

[0097] Cleaning time: 2min;

[0098] D4: Wash with flowing cold water. The hanging basket after washing with flowing hot water is hoisted into the cold water tank for washing with flowing cold water. During the process, the ultrasonic system is always on.

[0099] Among them, cold water temperature: room temperature;

[0100] Cleaning time: 2min;

[0101] D5: Pipe pickling: After being washed with running cold water, the hanging basket is hoisted into the pipe pickling tank for pickling;

[0102] The bath solution formula in the catheter pickling tank is: sulfuric acid, nitric acid, hydrofluoric acid, sodium chloride, OP emulsifier;

[0103] Temperature: room temperature;

[0104] Time: 1-10min;

[0105] The pickling time is set according to the state of the catheter during the receiving inspection. If there is no obvious oxide scale in the inner cavity of the catheter, a shorter pickling time is allowed. If there is obvious oxide scale in the inner cavity of the catheter, the pickling time should be set according to the upper limit of the allowable limit.

[0106] D6: Wash with running cold water, put the pickled hanging basket into the cold water tank for washing with running cold water;

[0107] Among them, cold water temperature: room temperature;

[0108] Cleaning time: 2min;

[0109] D7: Chemical passivation, the hanging basket washed with flowing cold water is hoisted into the catheter passivation tank for passivation;

[0110] The bath solution formula in the chemical passivation tank is: nitric acid, potassium dichromate;

[0111] Temperature: 50℃;

[0112] Time: 30 minutes;

[0113] D8: Wash with flowing cold water. The hanging basket after chemical passivation is hoisted into the cold water tank for washing with flowing cold water.

[0114] Among them, cold water temperature: room temperature;

[0115] Cleaning time: 2min;

[0116] D9: Neutralization: After washing with running cold water, the hanging basket is hoisted into the neutralization tank for neutralization to neutralize any residual acid;

[0117] Wherein, the formula of the tank liquid in the neutralization tank is: sodium carbonate;

[0118] Temperature: room temperature;

[0119] Time: 1min;

[0120] D10: Wash with running cold water. Put the neutralized hanging basket into the cold water tank for washing with running cold water.

[0121] Among them, cold water temperature: room temperature;

[0122] Cleaning time: 2min;

[0123] D11: Pure water washing, hang the hanging basket after running cold water washing into the pure water tank for washing;

[0124] Among them, pure water temperature: 70℃;

[0125] Cleaning time: 2min;

[0126] D12: Drying: Hang the hanging basket after pure water washing into the hot air tank for hot air drying;

[0127] Wherein, drying temperature: 60℃;

[0128] Time: 30 minutes

[0129] In the above, during each process D2--D11, the special hanging basket must be lifted once to drain the liquid in the catheter to replace the solution or cleaning water in the catheter to ensure the effects of degreasing, pickling, passivation and water washing; the whole process of each process D2--D11 is automatically executed by the single-arm crane group without human intervention.

[0130] Based on the fully automatic stainless steel aviation catheter pickling and passivation production system, large-scale and continuous production of stainless steel aviation catheters can be achieved. In terms of product quality, production efficiency, energy saving and environmental protection, it far exceeds the existing manual pickling and passivation technology, solves the problem of low efficiency of catheter pickling and passivation in the aviation repair process, and greatly improves the level of automation of aviation equipment surface treatment.

[0131] The single-arm crane of D1 adopts laser positioning.

[0132] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A fully automatic stainless steel aviation catheter pickling and passivation production system, characterized by: It includes the production line data acquisition layer, the system program control layer and the process route setting layer, as follows: The production line data acquisition layer is used to receive instructions from the upper-level program control layer and control the load; System program control layer, to realize the process parameter setting, control and monitoring of the production line; At the process route setting layer, we conduct traceability inquiries on product quality and maintain strict archival records of product materials, processes, procedures, and product flows.

2. The fully automatic stainless steel aviation catheter pickling and passivation production system according to claim 1 is characterized by: The upper program control layer is a computer.

3. The fully automatic stainless steel aviation catheter pickling and passivation production system according to claim 1 is characterized by: The production line data acquisition layer includes each plating tank at the production site and the load components on the plating tank.

4. The fully automatic stainless steel aviation catheter pickling and passivation production system according to claim 3 is characterized by: The plating tanks are degreasing tanks, water washing tanks, pickling tanks, passivation tanks, pure water tanks, and hot air tanks.

5. The fully automatic stainless steel aviation catheter pickling and passivation production system according to claim 3 is characterized by: The load components are sensors, single-arm cranes, circulating pumps, rectifiers, water pipes, thermocouples, liquid level gauges, and steam pipes.

6. The fully automatic stainless steel aviation catheter pickling and passivation production system according to claim 1 is characterized by: The process route setting layer includes a PLC control center, an output terminal, and a database, and is responsible for process route compilation and process parameter setting.

7. A production process using a fully automatic stainless steel aviation catheter pickling and passivation production system according to any one of claims 1 to 6, characterized in that: The specific steps are as follows: A. Inspection before pickling and passivation: A1: Check the catheter lumen for excess material; A2: Check the catheter surface for deformation, mechanical scratches, cracks, pits and other damage; B. Preparation before pickling and passivation: B1: Check that the composition of the tank liquid in each tank meets the requirements, and that the water, electricity and gas meet the requirements; B2: Check the equipment status of the fully automatic pickling and passivation system and the integrity of its configured instruments; B3: Check the integrity of the catheter hanging basket; B4: Place the stainless steel conduits evenly in a special hanging basket, with the conduits tilted 10° to the horizontal direction, and place the special hanging basket loaded with stainless steel conduits in the loading and hanging area; C. System pre-start: C1: Start the main power supply and open the PLC control panel; C2: Log in to the user account, enter the process page, select the "duct passivation" process, and start the stirring and heating switches; C3: Enter the monitoring page to check whether the driving group is waiting in the loading and hanging area, whether the tank liquid has reached the temperature, and whether there is any error message. After confirming that everything is ready, proceed to the next step; D. Fully automatic pickling and passivation treatment: D1: Click the "Total Start" switch on the PLC control page, and the basket will be automatically lifted through the automatic linkage of two single-arm cranes. Each lifting has an inclination angle to facilitate the drainage of liquid from the pipe; D2: Chemical degreasing: the driving group hoists the hanging basket into the chemical degreasing tank for chemical degreasing. During the degreasing process, the ultrasonic system is always on; The tank liquid formula in the chemical degreasing tank is: sodium hydroxide, sodium carbonate, sodium phosphate, sodium silicate; Degreasing temperature: 80℃; Degreasing time: 10min; D3: Wash with flowing hot water. The basket after chemical degreasing is hoisted into the hot water tank and washed with flowing hot water. During the process, the ultrasonic system is always on. Among them, hot water temperature: 50℃; Cleaning time: 2min; D4: Wash with flowing cold water. The hanging basket after washing with flowing hot water is hoisted into the cold water tank for washing with flowing cold water. During the process, the ultrasonic system is always on. Among them, cold water temperature: room temperature; Cleaning time: 2min; D5: Pipe pickling: After being washed with running cold water, the hanging basket is hoisted into the pipe pickling tank for pickling; The bath solution formula in the catheter pickling tank is: sulfuric acid, nitric acid, hydrofluoric acid, sodium chloride, OP emulsifier; Temperature: room temperature; Time: 1-10min; D6: Wash with running cold water, put the pickled hanging basket into the cold water tank for washing with running cold water; Among them, cold water temperature: room temperature; Cleaning time: 2min; D7: Chemical passivation, the hanging basket washed with flowing cold water is hoisted into the catheter passivation tank for passivation; The bath solution formula in the chemical passivation tank is: nitric acid, potassium dichromate; Temperature: 50℃; Time: 30 minutes; D8: Wash with flowing cold water. The hanging basket after chemical passivation is hoisted into the cold water tank for washing with flowing cold water. Among them, cold water temperature: room temperature; Cleaning time: 2min; D9: Neutralization: After washing with running cold water, the hanging basket is hoisted into the neutralization tank for neutralization to neutralize any residual acid; Wherein, the formula of the tank liquid in the neutralization tank is: sodium carbonate; Temperature: room temperature; Time: 1min; D10: Wash with running cold water. Put the neutralized hanging basket into the cold water tank for washing with running cold water. Among them, cold water temperature: room temperature; Cleaning time: 2min; D11: Pure water washing, hang the hanging basket after running cold water washing into the pure water tank for washing; Among them, pure water temperature: 70℃; Cleaning time: 2min; D12: Drying: Hang the hanging basket after pure water washing into the hot air tank for hot air drying; Wherein, drying temperature: 60℃; Time: 30 minutes.

8. The production process according to claim 7, characterized in that: The single-arm crane of D1 adopts laser positioning.

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