Method for circularly purifying and recycling PCB (Printed Circuit Board) equipment maintenance solution

Abstract

The invention discloses a method for circularly purifying and recycling a PCB (Printed Circuit Board) equipment maintenance solution, which belongs to the technical field of energy conservation and environmental protection and comprises the following steps: S10: acquiring the inner diameter of a cleaning tank in PCB processing equipment; s20, the cleaning tank is subjected to monitoring point distinguishing according to the size of the inner diameter, the number of the monitoring points is at least five, and the distance between at least one of the five monitoring points and a water outlet of the cleaning tank is 1-2 m; marking the monitoring points as reference monitoring points; s30, after maintenance of the PCB processing equipment is completed, residual components of the maintenance liquid at the distinguished monitoring points are collected, and the residual components comprise the pH value of the maintenance liquid and the concentration of the liquid medicine; through refined monitoring, dynamic analysis, model verification and multi-stage purification treatment, efficient cyclic utilization of the preservative solution is achieved, the management efficiency and the environmental protection performance of the preservative solution are improved, and remarkable economic and social benefits are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of energy conservation and environmental protection, and in particular to a method for circulating, purifying and reusing maintenance fluid for PCB equipment. Background Art

[0002] The PCB industry is a pillar industry of China's electronic information industry. Its growth rate is increasing at the same rate as the electronic information industry, which has led to an increasing use of equipment for manufacturing PCB boards in modern society. Therefore, the maintenance of equipment for manufacturing PCB boards has also become more frequent.

[0003] In the prior art, when maintaining equipment for manufacturing PCBs, the maintenance liquid is mixed and proportioned by the central medicine supply module in the equipment and then passed into the cleaning tank that needs maintenance. After the maintenance is completed, the liquid is directly discharged into the wastewater treatment center.

[0004] The main components of the maintenance fluid include acidic maintenance fluid (such as 1.5% H2SO4) and alkaline maintenance fluid (such as 3% NaOH). The acidic maintenance fluid undergoes an oxidation-reduction reaction with metal oxides (such as rust and copper rust) to generate soluble salts, thereby stripping off the scaling layer; the alkaline maintenance fluid removes grease through saponification reaction, generating soluble sodium fatty acids, emulsifying and stripping off oil stains.

[0005] Although some H2SO4 has reacted with metal oxides to form soluble salts (such as ferrous sulfate and copper sulfate), these salts themselves still have a certain degree of chemical activity and can continue to participate in subsequent reactions. In addition, there may still be unreacted H2SO4 in the maintenance solution.

[0006] Therefore, if the maintenance fluid is directly discharged into the wastewater treatment center after maintenance is completed, it will lead to insufficient utilization of the effective ingredients of the maintenance fluid and cause a waste of resources in the maintenance fluid treatment process. Summary of the Invention

[0007] In view of the above problems existing in the existing energy-saving and environmental protection technical field, the present invention is proposed.

[0008] Therefore, one of the objectives of the present invention is to provide a method for the recycling, purification and reuse of PCB equipment maintenance fluid. Through refined monitoring, dynamic analysis, model verification and multi-stage purification treatment, the method achieves efficient recycling of the maintenance fluid, improves the management efficiency and environmental performance of the maintenance fluid, and has significant economic and social benefits.

[0009] In order to solve the above technical problems, the present invention provides the following technical solutions: The present invention provides a method for circulating, purifying and reusing a maintenance fluid for a PCB device, comprising the following steps: S10: Obtain the inner diameter of the cleaning tank in the PCB processing equipment; S20: Divide the cleaning tank into monitoring points according to the inner diameter, and divide the monitoring points into at least 5. Among the 5 monitoring points, at least one monitoring point is 1-2 meters away from the drain outlet of the cleaning tank; mark the monitoring point as a reference monitoring point; S30: After the maintenance of the PCB processing equipment is completed, the remaining components of the maintenance solution at each of the distinguished monitoring points are collected, and the remaining components include the pH value and the concentration of the maintenance solution; S40: When collecting the residual components, a monitoring point farthest from the reference monitoring point is used as an initial monitoring point, and the dynamic changes of the residual components in the maintenance solution are analyzed based on the residual components collected at the initial monitoring point; the dynamic changes include the pH value and the concentration of the liquid and the dynamic flow direction in the cleaning tank; S50: If the residual component is not collected at the initial monitoring point, the residual component of the monitoring point between the initial monitoring point and the reference monitoring point is collected, the residual component is marked as the reference residual component, and the residual component of the reference monitoring point is collected, and the residual component is compared with the reference residual component; S60: Based on the comparison result, if the reference residual component is less than the residual component at the reference monitoring point, it is determined that the pH value and the concentration of the drug solution in the residual component in the cleaning tank are low; otherwise, it is determined that the pH value and the concentration of the drug solution in the residual component are high; S70: If it is determined that the pH value and the concentration of the remaining components are low, the maintenance liquid in the cleaning tank is discharged; otherwise, it is retained for use.

[0010] As a preferred embodiment of the present invention, in S40, the dynamic changes of the remaining components in the maintenance solution are analyzed based on the remaining components collected at the initial monitoring point. The analysis method includes time series analysis. The steps are as follows: Regularly collect pH values ​​and drug solution concentrations at the initial monitoring points; The collected data of pH value and drug solution concentration are plotted on a time series graph, wherein the horizontal axis is time and the vertical axis is pH value and drug solution concentration respectively; Observe the changing trends of pH value and concentration of the drug solution over time, and determine whether the pH value and concentration of the drug solution are increasing, decreasing or stable; and predict the status of the maintenance solution based on the trend; The analysis method also includes numerical simulation, the steps are as follows: A three-dimensional fluid dynamics and chemical reaction model is established based on the geometry, fluid dynamics conditions, and chemical reaction mechanism of the cleaning tank. In the model, the input values ​​are the geometry, fluid dynamics conditions, chemical reaction mechanism, and operating conditions, and the output values ​​are the fluid dynamics parameters and chemical reaction parameters. Solve the model to obtain the pH value and concentration distribution of the maintenance solution in the cleaning tank; The results of the solved model are compared and verified with the actual monitoring data, and the parameters of the model are adjusted according to the results of the comparison and verification.

[0011] As a preferred embodiment of the present invention, the model is solved to obtain the distribution of the pH value and the concentration of the maintenance solution in the cleaning tank, which is calculated according to the following formula: ; Where, Indicates the amount of maintenance fluid input into the cleaning tank. Indicates the density of the fluid in the cleaning tank, Indicates time, which is the entire period from the time the maintenance fluid enters the cleaning tank to the completion of the cleaning process; represents the velocity vector of the fluid in the cleaning tank, represents the divergence operator, which is the rate of change of the fluid mass in the maintenance fluid in the cleaning tank space; Indicates the pressure of the fluid in the cleaning tank. Indicates the dynamic viscosity of the fluid in the cleaning tank, Represents the volume force acting on the fluid. The volume force includes gravity. Gravity is the weight of the pH value and concentration of the maintenance fluid input into the cleaning tank. Represents the tensor product, which represents the velocity vector The outer product of .

[0012] As a preferred embodiment of the present invention, solving the model to obtain the distribution of the pH value and the concentration of the maintenance solution in the cleaning tank also includes calculating according to the following formula: ; Where, Indicates the amount of maintenance fluid input into the cleaning tank. Indicates the density of the fluid in the cleaning tank, It represents the total kinetic energy of the fluid in the cleaning tank, which includes internal energy and kinetic energy; Indicates the temperature of the fluid in the cleaning tank, Indicates the thermal conductivity of the fluid in the cleaning tank, Represents the heat source term per unit mass of fluid in the cleaning tank, represents the velocity vector of the fluid in the cleaning tank, Indicates time, which is the entire period from the time the maintenance fluid enters the cleaning tank to the completion of the cleaning process; Represents the divergence operator, which is the rate of change of the fluid mass in the maintenance fluid in the cleaning tank space.

[0013] As a preferred embodiment of the present invention, the maintenance liquid is purified according to the calculated pH value and the distribution of the liquid concentration, and the purification process includes three-stage processing units, as shown below: The first-stage treatment unit uses filter elements with gradient pore sizes of 50μm, 20μm, 10μm, and 5μm in the cleaning tank to intercept suspended particles and mechanical impurities in the maintenance fluid; The second-stage treatment unit is filled with columnar granular activated carbon in the cleaning tank with a particle size of 8-12 mesh and a filling density of 0.45-0.54g / cm³ to absorb organic pollutants and pigments in the maintenance solution; The third-stage treatment unit replenishes the maintenance liquid according to the pH value and concentration of the remaining components in the cleaning tank after passing through the first-stage treatment unit and the second-stage treatment unit.

[0014] As a preferred embodiment of the present invention, when the maintenance fluid is replenished, verification is performed based on the calculated pH value and the distribution of the drug solution concentration. The verification includes collecting the pH value and the drug solution concentration at each distinguished monitoring point, and presetting a critical threshold based on the pH value and the drug solution concentration. At each monitoring point, when the collected pH value and drug solution concentration are lower than the critical threshold, the maintenance fluid is replenished at the corresponding monitoring point, and the remaining monitoring points are not replenished.

[0015] As a preferred solution of the present invention, the method of obtaining the relevant data corresponding to the need to replenish the maintenance fluid includes: After the maintenance liquid enters the cleaning tank, the change of the liquid concentration toward the monitoring point between the initial monitoring point and the reference monitoring point is obtained based on the initial monitoring point; the change includes the flow rate of the liquid; Based on the preset reference interval of the flow rate, when a new maintenance solution is introduced into the cleaning tank of the PCB processing equipment in the future, after the maintenance solution has completely entered the cleaning tank, the change of the solution concentration toward the monitoring point between the initial monitoring point and the reference monitoring point is obtained based on the initial monitoring point; If the change is lower than the reference range, it is determined that the maintenance fluid needs to be added to the cleaning tank; otherwise, it is determined that no addition is required.

[0016] A terminal includes a processor, an input interface, an output interface and a memory, wherein the processor, the input interface, the output interface and the memory are interconnected, wherein the memory is used to store a computer program, the computer program includes program instructions, and the processor is configured to call the program instructions to execute the above method.

[0017] A computer-readable storage medium stores a computer program, wherein the computer program includes program instructions. When the program instructions are executed by a processor, the processor executes the above method. Beneficial effects

[0018] 1. By setting up multiple monitoring points in the cleaning tank to monitor the pH value and concentration of the maintenance solution in real time, the dynamic changes of the maintenance solution can be more accurately grasped, which helps to adjust the maintenance solution usage strategy in a timely manner, thereby improving the maintenance effect of the equipment; 2. Combining time series analysis and numerical simulation analysis, it is possible to predict and manage the dynamic changes of maintenance fluids, helping companies plan the use and replenishment of maintenance fluids in advance and improve production efficiency; 3. Through the three-stage purification treatment unit (filtration, adsorption, pH adjustment), the maintenance fluid is ensured to maintain good performance during the recycling process, which helps to improve the maintenance quality of the equipment, extend the service life of the equipment, and reduce the equipment failure rate; 4. By recycling, purifying and reusing the maintenance fluid, the utilization rate of the maintenance fluid is significantly improved and the use of fresh maintenance fluid is reduced, which not only reduces the maintenance cost, but also reduces the waste of resources caused by frequent replacement of maintenance fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort. Among them: Figure 1 Schematic diagram of a method flow in an embodiment of the present invention; Figure 2 Schematic diagram of the process structure of an embodiment of the present invention. DETAILED DESCRIPTION

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of the present invention.

[0021] In the prior art, the maintenance fluid is directly discharged into the wastewater treatment center after the maintenance is completed, which leads to insufficient utilization of the effective components of the maintenance fluid and a waste of resources in the maintenance fluid treatment process.

[0022] Based on this, the present invention proposes a method for the recycling, purification and reuse of PCB equipment maintenance fluid. Through refined monitoring, dynamic analysis, model verification and multi-stage purification treatment, the method achieves efficient recycling of the maintenance fluid, improves the management efficiency and environmental performance of the maintenance fluid, and has significant economic and social benefits.

[0023] The present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0024] Reference Figures 1 to 2 , is an embodiment of the present invention, which provides a method for recycling, purifying and reusing PCB equipment maintenance fluid, comprising the following steps: S10: Obtain the inner diameter of the cleaning tank in the PCB processing equipment; S20: Divide the cleaning tank into monitoring points according to the inner diameter, and divide the monitoring points into at least 5. Among the 5 monitoring points, at least one monitoring point is 1-2 meters away from the drain outlet of the cleaning tank; mark the monitoring point as a reference monitoring point; In this embodiment, by setting up multiple monitoring points, the distribution of the maintenance liquid in the cleaning tank can be more comprehensively monitored, especially in areas far from the drain outlet, to ensure the representativeness of the monitoring data; This also provides basic data support for subsequent dynamic analysis and purification processing; S30: After the maintenance of the PCB processing equipment is completed, the remaining components of the maintenance solution at each of the distinguished monitoring points are collected, and the remaining components include the pH value and the concentration of the maintenance solution; S40: When collecting the residual components, a monitoring point farthest from the reference monitoring point is used as an initial monitoring point, and the dynamic changes of the residual components in the maintenance solution are analyzed based on the residual components collected at the initial monitoring point; the dynamic changes include the pH value and the concentration of the liquid and the dynamic flow direction in the cleaning tank; S50: If the residual component is not collected at the initial monitoring point, the residual component of the monitoring point between the initial monitoring point and the reference monitoring point is collected, the residual component is marked as the reference residual component, and the residual component of the reference monitoring point is collected, and the residual component is compared with the reference residual component; In this embodiment, by analyzing the dynamic changes, the state of the maintenance fluid can be understood in real time; By comparing data from different monitoring points, even if the data from the initial monitoring point is missing, it can be supplemented by data from other monitoring points to ensure data integrity; S60: Based on the comparison result, if the reference residual component is less than the residual component at the reference monitoring point, it is determined that the pH value and the concentration of the drug solution in the residual component in the cleaning tank are low; otherwise, it is determined that the pH value and the concentration of the drug solution in the residual component are high; S70: If it is determined that the pH value and the concentration of the remaining components are low, the maintenance solution in the cleaning tank is discharged; otherwise, it is retained for use; In S40, the dynamic changes of the remaining components in the maintenance solution are analyzed based on the remaining components collected at the initial monitoring point. The analysis method includes time series analysis. The steps are as follows: Regularly collect pH values ​​and drug solution concentrations at the initial monitoring points; It should be noted that regular collection includes every 10 minutes or every hour; The collected data of pH value and drug solution concentration are plotted on a time series graph, wherein the horizontal axis is time and the vertical axis is pH value and drug solution concentration respectively; Observe the changing trends of pH value and concentration of the drug solution over time, and determine whether the pH value and concentration of the drug solution are increasing, decreasing or stable; and predict the status of the maintenance solution based on the trend; In this embodiment, for example, if the pH value gradually decreases, it may indicate that the acid in the acidic maintenance solution is gradually consumed; If the concentration of the liquid medicine gradually decreases, it may indicate that the active ingredients in the maintenance liquid are gradually consumed; This analysis method can intuitively show the dynamic change trend of the maintenance fluid; The analysis method also includes numerical simulation, the steps are as follows: A three-dimensional fluid dynamics and chemical reaction model is established based on the geometry, fluid dynamics conditions, and chemical reaction mechanism of the cleaning tank. In the model, the input values ​​are the geometry, fluid dynamics conditions, chemical reaction mechanism, and operating conditions, and the output values ​​are the fluid dynamics parameters and chemical reaction parameters. It should be noted that, in terms of input values, the geometric shape is the three-dimensional geometric model of the cleaning tank, including size, shape and internal structure; Fluid dynamic conditions, including fluid velocity, fluid pressure, fluid viscosity, fluid density and boundary conditions. Boundary conditions include the inlet and outlet conditions of the cleaning tank, such as flow rate and pressure; Chemical reaction mechanisms, including reaction rate constants and reactant concentrations; Operating conditions, including the temperature distribution in the cleaning tank and the residence time of the maintenance solution in the cleaning tank; Fluid dynamics parameters include fluid velocity distribution, fluid pressure distribution, fluid viscosity distribution, and fluid density distribution; In terms of output values, fluid dynamics parameters include fluid velocity distribution, fluid pressure distribution, fluid viscosity distribution, and fluid density distribution; Chemical reaction parameters include reactant concentration distribution and product concentration distribution; Solve the model to obtain the pH value and concentration distribution of the maintenance solution in the cleaning tank; Compare and verify the results of the solved model with the actual monitoring data, and adjust the model parameters according to the results of the comparison and verification; Adjusting the model parameters according to the results of comparative verification can improve the simulation accuracy of the model; The dynamic changes of maintenance fluid in the cleaning tank can be predicted, which helps to optimize the design and operating conditions of the cleaning tank; It should be emphasized that through time series analysis, the future state of the maintenance fluid can be predicted; By comparing numerical simulation with actual data, the accuracy of the model is verified and the reliability of the model is improved; Furthermore, the model results can be used to optimize the design and operating conditions of the cleaning tank and improve the utilization efficiency of the maintenance fluid; Solve the model to obtain the distribution of the pH value and concentration of the maintenance solution in the cleaning tank, which are calculated according to the following formula: ; Where, Indicates the amount of maintenance fluid input into the cleaning tank. Indicates the density of the fluid in the cleaning tank, Indicates time, which is the entire period from the time the maintenance fluid enters the cleaning tank to the completion of the cleaning process; represents the velocity vector of the fluid in the cleaning tank, represents the divergence operator, which is the rate of change of the fluid mass in the maintenance fluid in the cleaning tank space; Indicates the pressure of the fluid in the cleaning tank. Indicates the dynamic viscosity of the fluid in the cleaning tank, Represents the volume force acting on the fluid. The volume force includes gravity. Gravity is the weight of the pH value and concentration of the maintenance fluid input into the cleaning tank. Represents the tensor product, which represents the velocity vector The outer product of , Solve the model to obtain the distribution of pH and concentration of the maintenance solution in the cleaning tank, including calculations based on the following formula: ; Where, Indicates the amount of maintenance fluid input into the cleaning tank. Indicates the density of the fluid in the cleaning tank, It represents the total kinetic energy of the fluid in the cleaning tank, which includes internal energy and kinetic energy; Indicates the temperature of the fluid in the cleaning tank, Indicates the thermal conductivity of the fluid in the cleaning tank, Represents the heat source term per unit mass of fluid in the cleaning tank, represents the velocity vector of the fluid in the cleaning tank, Indicates time, which is the entire period from the time the maintenance fluid enters the cleaning tank to the completion of the cleaning process; represents the divergence operator, which is the rate of change of the fluid mass in the maintenance fluid in the cleaning tank space; It should be noted that the above two formulas jointly describe the dynamic behavior of the maintenance fluid in the cleaning tank, including the dynamic characteristics of the fluid, which are used to describe the velocity and pressure distribution of the fluid, and also used to describe the temperature and energy distribution of the fluid. These two equations are coupled together through common factors such as time variables, velocity vectors, density and divergence operators, reflecting the mutual influence of fluid dynamics and thermodynamic processes. By solving these two equations, we can fully understand the distribution of pH value and chemical concentration of the maintenance fluid in the cleaning tank; The maintenance solution is purified based on the calculated pH value and the distribution of the solution concentration. The purification process includes three treatment units, as shown below: The first-stage treatment unit uses filter elements with gradient pore sizes of 50μm, 20μm, 10μm, and 5μm in the cleaning tank to intercept suspended particles and mechanical impurities in the maintenance fluid; The second-stage treatment unit is filled with columnar granular activated carbon in the cleaning tank with a particle size of 8-12 mesh and a filling density of 0.45-0.54g / cm³ to absorb organic pollutants and pigments in the maintenance solution; The third-stage treatment unit replenishes the maintenance solution according to the pH value and concentration of the remaining components in the cleaning tank after passing through the first-stage treatment unit and the second-stage treatment unit; In this embodiment, the three-stage treatment unit can effectively remove impurities and pollutants in the maintenance liquid, thereby improving the purity of the maintenance liquid; And it is replenished according to the actual remaining ingredients to ensure that the maintenance fluid is always in the best condition and extend the service life of the maintenance fluid; Reduces the discharge of maintenance fluid and reduces sewage treatment costs; When replenishing the maintenance solution, verification is performed based on the calculated pH value and the distribution of the drug solution concentration. The verification includes collecting the pH value and the drug solution concentration at each of the identified monitoring points, and presetting critical thresholds based on the pH value and the drug solution concentration. At each monitoring point, when the collected pH value and drug solution concentration are lower than the critical threshold, the maintenance solution is replenished at the corresponding monitoring point, and the remaining monitoring points are not replenished. It should be noted that when the collected pH value and liquid concentration are lower than the critical threshold, it indicates that the pH value and liquid concentration at certain monitoring points have been too low during the entire period from the time the maintenance liquid enters the cleaning tank to the completion of the cleaning process. Therefore, replenishment is required at this monitoring point. Factors that cause such uneven pH value and liquid concentration include fluid dynamics. For example, if the flow rate distribution in the cleaning tank is uneven, the degree of mixing of the maintenance liquid in different areas will be different. The maintenance liquid in the high flow rate area is better mixed, and the pH value and liquid concentration may be more uniform. However, at low flow rates or in dead zones, the maintenance liquid is not mixed enough, resulting in uneven distribution of pH value and liquid concentration. In this embodiment, a verification mechanism is used to ensure that maintenance fluid is replenished only when necessary, thus avoiding waste of resources; Moreover, the verification mechanism can realize automated management, reduce manual intervention and improve management efficiency; Obtain data related to whether maintenance fluid needs to be replenished. The methods for obtaining data include: After the maintenance liquid enters the cleaning tank, the change of the liquid concentration toward the monitoring point between the initial monitoring point and the reference monitoring point is obtained based on the initial monitoring point; the change includes the flow rate of the liquid; Based on the preset reference interval of the flow rate, when a new maintenance solution is introduced into the cleaning tank of the PCB processing equipment in the future, after the maintenance solution has completely entered the cleaning tank, the change of the solution concentration toward the monitoring point between the initial monitoring point and the reference monitoring point is obtained based on the initial monitoring point; If the change is lower than the reference range, it is determined that the maintenance fluid needs to be added to the cleaning tank; otherwise, it is determined that no replenishment is required; In this embodiment, the replenishment strategy of the maintenance fluid is dynamically adjusted according to real-time data to ensure the stable performance of the maintenance fluid and reduce unnecessary replenishment.

[0025] A terminal includes a processor, an input interface, an output interface and a memory, wherein the processor, the input interface, the output interface and the memory are interconnected, wherein the memory is used to store a computer program, the computer program includes program instructions, and the processor is configured to call the program instructions to execute the above method.

[0026] A computer-readable storage medium stores a computer program, wherein the computer program includes program instructions. When the program instructions are executed by a processor, the processor executes the above method.

[0027] In summary, this application achieves efficient recycling of maintenance fluid through refined monitoring, dynamic analysis, model verification and multi-stage purification treatment, and improves the management efficiency and environmental performance of maintenance fluid, with significant economic and social benefits.

[0028] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for recycling, purifying and reusing PCB equipment maintenance fluid, characterized in that: The following steps are involved: S10: Obtain the inner diameter of the cleaning tank in the PCB processing equipment; S20: Divide the cleaning tank into monitoring points according to the inner diameter, wherein the monitoring points are divided into at least five, and at least one of the five monitoring points is 1-2 meters away from the drain outlet of the cleaning tank; and mark the monitoring point as a reference monitoring point; S30: After the maintenance of the PCB processing equipment is completed, the remaining components of the maintenance solution at each of the distinguished monitoring points are collected, and the remaining components include the pH value and the concentration of the maintenance solution; S40: When collecting the residual components, a monitoring point farthest from the reference monitoring point is used as an initial monitoring point, and dynamic changes of the residual components in the maintenance solution are analyzed based on the residual components collected at the initial monitoring point; the dynamic changes include the pH value and the dynamic flow direction of the liquid concentration in the cleaning tank; S50: If the remaining component is not collected at the initial monitoring point, collecting the remaining component at a monitoring point between the initial monitoring point and the reference monitoring point, marking the remaining component as a reference remaining component, collecting the remaining component at the reference monitoring point, and comparing the remaining component with the reference remaining component; S60: If, based on the comparison result, the reference residual component is less than the residual component at the reference monitoring point, it is determined that the pH value and the concentration of the drug solution in the residual component in the cleaning tank are low; On the contrary, it is judged that the pH value and the concentration of the drug solution in the remaining components are high; S70: If it is determined that the pH value and the concentration of the remaining components are low, the maintenance liquid in the cleaning tank is discharged; otherwise, it is retained for use.

2. The method for recycling, purifying and reusing a PCB equipment maintenance fluid according to claim 1, characterized in that: In S40, the dynamic changes of the remaining components in the maintenance solution are analyzed based on the remaining components collected at the initial monitoring point. The analysis method includes time series analysis. The steps are as follows: Regularly collecting the pH value and drug solution concentration of the initial monitoring point; The collected data of pH value and drug solution concentration are plotted on a time series graph, wherein the horizontal axis is time and the vertical axis is pH value and drug solution concentration respectively; Observe the changing trends of pH value and concentration of the drug solution over time, and determine whether the pH value and concentration of the drug solution show an increasing, decreasing or stable trend; and predict the state of the maintenance solution based on the trend; The analysis method also includes numerical simulation, the steps are as follows: Establishing a three-dimensional fluid dynamics and chemical reaction model based on the geometry, fluid dynamics conditions, and chemical reaction mechanism of the cleaning tank; in the model, the input values ​​are the geometry, fluid dynamics conditions, chemical reaction mechanism, and operating conditions, and the output values ​​are the fluid dynamics parameters and chemical reaction parameters; Solving the model to obtain the distribution of pH value and concentration of the maintenance solution in the cleaning tank; The results of solving the model are compared and verified with the actual monitoring data, and the parameters of the model are adjusted according to the results of the comparison and verification.

3. The method for recycling, purifying and reusing a PCB equipment maintenance fluid according to claim 2, characterized in that: Solve the model to obtain the pH value and concentration distribution of the maintenance solution in the cleaning tank, which are calculated according to the following formula: ； Where, Indicates the amount of maintenance fluid input into the cleaning tank. Indicates the density of the fluid in the cleaning tank, Indicates the time, which is the entire period from the time the maintenance liquid enters the cleaning tank to the completion of the cleaning process; represents the velocity vector of the fluid in the cleaning tank, represents a divergence operator, which is the rate of change of the fluid mass in the maintenance fluid in the cleaning tank; Indicates the pressure of the fluid in the cleaning tank. Indicates the dynamic viscosity of the fluid in the cleaning tank, Represents the volume force acting on the fluid, which includes gravity, which is the weight of the pH value and concentration of the maintenance liquid input into the cleaning tank. represents the tensor product, which represents the velocity vector The outer product of .

4. The method for recycling, purifying and reusing a PCB equipment maintenance fluid according to claim 3, characterized in that: Solving the model to obtain the distribution of the pH value and concentration of the maintenance solution in the cleaning tank also includes calculating according to the following formula: ； Where, Indicates the amount of maintenance fluid input into the cleaning tank. Indicates the density of the fluid in the cleaning tank, represents the total kinetic energy of the fluid in the cleaning tank, which includes internal energy and kinetic energy; Indicates the temperature of the fluid in the cleaning tank, Indicates the thermal conductivity of the fluid in the cleaning tank, Represents the heat source term per unit mass of fluid in the cleaning tank, represents the velocity vector of the fluid in the cleaning tank, Indicates the time, which is the entire period from the time the maintenance liquid enters the cleaning tank to the completion of the cleaning process; represents a divergence operator, which is the rate of change of the fluid mass in the maintenance liquid in the space of the cleaning tank.

5. The method for recycling, purifying and reusing a PCB equipment maintenance fluid according to any one of claims 3 to 4, characterized in that: The maintenance solution is purified according to the calculated pH value and the distribution of the concentration of the liquid medicine. The purification process includes three processing units as shown below: The first-stage treatment unit uses filter elements with gradient pore sizes of 50 μm, 20 μm, 10 μm, and 5 μm in the cleaning tank to intercept suspended particles and mechanical impurities in the maintenance liquid; The second-stage treatment unit is filled with columnar granular activated carbon in the cleaning tank, with a particle size of 8-12 mesh and a filling density of 0.45-0.54g / cm³, to absorb organic pollutants and pigments in the maintenance solution; The third-stage processing unit replenishes the maintenance liquid according to the pH value and concentration of the remaining components in the cleaning tank after the maintenance liquid passes through the first-stage processing unit and the second-stage processing unit.

6. The method for recycling, purifying and reusing a PCB equipment maintenance fluid according to claim 5, characterized in that: When the maintenance fluid is replenished, verification is performed based on the calculated pH value and distribution of the drug solution concentration. The verification includes collecting the pH value and drug solution concentration at each of the distinguished monitoring points, and presetting a critical threshold based on the pH value and drug solution concentration. At each monitoring point, when the collected pH value and drug solution concentration are lower than the critical threshold, the maintenance fluid is replenished at the corresponding monitoring point, and the remaining monitoring points are not replenished.

7. The method for recycling, purifying and reusing a PCB equipment maintenance fluid according to claim 6, characterized in that: Obtaining relevant data corresponding to whether the maintenance fluid needs to be replenished, including: After the maintenance liquid has entered the cleaning tank, the change of the liquid concentration toward a monitoring point between the initial monitoring point and the reference monitoring point is obtained based on the initial monitoring point; the change includes the flow rate of the liquid; According to the preset reference interval of the flow rate, when a new maintenance solution is introduced into the cleaning tank of the PCB processing equipment in a future period, after the maintenance solution has completely entered the cleaning tank, the change of the concentration of the solution toward a monitoring point between the initial monitoring point and the reference monitoring point is obtained based on the initial monitoring point; If the change is lower than the reference interval, it is determined that the maintenance liquid needs to be replenished in the cleaning tank; otherwise, it is determined that no replenishment is required.

8. A terminal, characterized in that: The method comprises a processor, an input interface, an output interface and a memory, wherein the processor, the input interface, the output interface and the memory are interconnected, wherein the memory is used to store a computer program, the computer program includes program instructions, and the processor is configured to call the program instructions to execute the method according to any one of claims 1 to 7.

9. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, wherein the computer program includes program instructions. When the program instructions are executed by a processor, the processor is caused to perform the method according to any one of claims 1 to 7.

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