PCB grinding section sewage copper powder filtering and recycling water circulation system and method

Abstract

The present application relates to PCB processing wastewater treatment and recycling water supply technical field, specifically a kind of PCB grinding section sewage copper powder filtration recycling water circulation system and method.It includes:including grinding section, filter barrel group, copper powder centralized recovery tower group, sewage tank, clean water tank, state acquisition component, distribution control unit and water inlet distribution valve group.Grinding section produces copper powder and resin impurities containing grinding sewage backflow to sewage tank, after sedimentation and preliminary filtration, into copper powder centralized recovery tower group to carry out centralized filtration and copper powder recovery, filtered clean water enters clean water tank again sedimentation filtration, and after further filtration by filter barrel group, back to grinding section use.State acquisition component collects grinding section operating state, sewage tank water inlet state and each copper powder centralized recovery tower filtration state, distribution control unit determines filtration load distribution result accordingly, and the sewage amount of each copper powder centralized recovery tower is adjusted by water inlet distribution valve group, to improve filtration continuity and recycling water stability.

Description

Technical Field

[0001] This invention relates to the field of PCB processing wastewater treatment and circulating water supply technology, specifically a PCB grinding section wastewater copper powder filtration and recycling water circulation system and method. Background Technology

[0002] During the grinding, brushing, or resin-filled via-board leveling processes of PCBs, a continuous supply of spray water is required to remove copper powder, resin powder, and grinding particles generated during grinding. These impurities, discharged with the spray water, form copper-containing grinding wastewater. Direct discharge into the wastewater treatment system not only increases the load on downstream wastewater treatment but also wastes copper powder resources and increases production water consumption. Therefore, installing a copper powder filtration and recycling system and a circulating water supply in the PCB grinding section is crucial for reducing water costs in the grinding section, minimizing the discharge of copper-containing wastewater, and recovering copper powder.

[0003] Existing technologies already include solutions for sedimentation, filtration, and copper powder recovery of PCB grinding wastewater or brushing wastewater. For example, CN202344397U discloses a copper powder recovery device for a printed circuit board grinding production line. This device uses several sedimentation tanks to allow copper powder-containing wastewater to undergo multiple sedimentation stages before filtration, thus reducing filter clogging and improving copper powder recovery efficiency. While this solution focuses on reducing the risk of filter clogging through multi-stage sedimentation, its overall structure primarily revolves around sedimentation tanks and filtration tanks. It lacks a systematic design for the unified return, centralized sedimentation, centralized entry into the copper powder recovery tower group, and subsequent clean water recycling of wastewater generated from multiple grinding stages.

[0004] For example, CN209396994U discloses a wastewater treatment device for PCB brushing and polishing machines, which includes a wastewater tank, a clean water tank, a circulating pump, and a filter. It uses a multi-stage filtration system consisting of primary filter bags, secondary filter bags, and tertiary filters to allow the treated water to be reused in production. While this solution embodies the concept of wastewater reuse and copper powder filtration, its filtration path primarily involves a fixed series or partial parallel connection of multi-stage filters. It fails to adequately consider the impact of differences in wastewater volume, impurity content, and filtration load across multiple polishing stages on the operating status of the filtration unit when multiple polishing sections generate wastewater simultaneously.

[0005] For example, CN203458886U discloses a copper powder recovery machine for circuit board grinding wastewater. It places a filter tank inside a fixed tank and uses a motor to rotate the filter tank, utilizing centrifugal force to improve filtration efficiency. This solution focuses on improving the filtration efficiency of a single copper powder recovery machine, but it does not address how to centrally return, centrally settle, grade, and filter copper-containing wastewater generated from multiple grinding stages in a PCB grinding production line, as well as the coordination between filter unit cleaning and maintenance and production continuity.

[0006] Therefore, while existing technologies have proposed copper powder recovery methods such as sedimentation filtration, multi-stage filtration, or rotary filtration, most solutions still focus on single filtration devices or single-path filtration structures. When a PCB production line has multiple grinding sections, if the copper-containing grinding wastewater generated by each section still enters its corresponding filtration unit separately, it can easily lead to limited sedimentation space and filtration stages. Especially when the grinding cutting volume in the front section is large and there are many copper powder and resin impurities, the corresponding filtration unit is more prone to clogging, shortening the cleaning cycle and potentially affecting continuous production of the grinding line during cleaning and maintenance. Even if the wastewater is concentrated before entering multiple filtration units, relying solely on fixed pipelines or an evenly distributed water supply method makes it difficult to promptly reflect the differences in load of different grinding sections and the degree of clogging in each filtration unit. Summary of the Invention

[0007] The purpose of this invention is to provide a PCB grinding section wastewater copper powder filtration and recycling water recycling system and method to solve the technical problems mentioned in the background art.

[0008] Based on the above ideas, the present invention provides the following technical solution: A wastewater copper powder filtration and recycling system for PCB grinding sections includes: It includes a grinding section, a filter barrel assembly, a copper powder centralized recovery tower assembly, a wastewater tank, a clear water tank, a status acquisition component, a distribution control unit, and an inlet water distribution valve assembly; The grinding section is used to grind the PCB board and generates grinding wastewater containing copper powder and resin impurities. The wastewater tank is connected to the grinding section via a wastewater return pipeline, and is used to receive the grinding wastewater generated by the grinding section, and to perform sedimentation and preliminary filtration on the grinding wastewater; The copper powder centralized recovery tower group is connected to the sewage tank and is used to centrally filter the sewage after sedimentation and preliminary filtration in the sewage tank, and to intercept and recover copper powder and resin impurities in the sewage. The clear water tank is connected to the copper powder centralized recovery tower group and is used to receive the clear water filtered by the copper powder centralized recovery tower group, and to perform further sedimentation and filtration on the clear water. The filter tank assembly is connected between the clear water tank and the grinding section, and is used to further filter the clear water output from the clear water tank, and to return the filtered clear water to the grinding section for use; The status acquisition components are respectively set up with the grinding section, the sewage tank and the copper powder centralized recovery tower group, and are used to collect the operating status of the grinding section, the water inlet status of the sewage tank and the filtration status of each copper powder centralized recovery tower in the copper powder centralized recovery tower group. The allocation control unit is connected to the status acquisition component and is used to determine the filtration load allocation result of each copper powder centralized recovery tower according to the operation status, the water inlet status and the filtration status. The inlet distribution valve group is connected between the sewage tank and the copper powder centralized recovery tower group, and is connected to the distribution control unit, for adjusting the amount of sewage entering each copper powder centralized recovery tower according to the filtration load distribution result.

[0009] Preferably, multiple grinding sections are provided, and each of the multiple grinding sections is connected to the wastewater tank through the wastewater return pipeline, so that the grinding wastewater generated by the multiple grinding sections is centrally returned to the wastewater tank.

[0010] Preferably, the wastewater tank is equipped with a multi-layer overflow structure and a filter screen structure. The grinding wastewater passes through the multi-layer overflow sedimentation and filter screen interception in the wastewater tank before being output to the copper powder centralized recovery tower group.

[0011] Preferably, a filter pump is provided between the wastewater tank and the copper powder centralized recovery tower group, and the filter pump is used to transport the wastewater after sedimentation and preliminary filtration in the wastewater tank to the copper powder centralized recovery tower group.

[0012] Preferably, the copper powder centralized recovery tower group includes multiple copper powder centralized recovery towers, which are arranged in parallel to receive wastewater from the wastewater tank, so that the wastewater after sedimentation and preliminary filtration in the wastewater tank is distributed to the multiple copper powder centralized recovery towers for filtration.

[0013] Preferably, each of the multiple copper powder centralized recovery towers is equipped with an inlet pipe and an outlet pipe, and any one of the copper powder centralized recovery towers can be cleaned or maintained while the other copper powder centralized recovery towers are still in filtration operation.

[0014] Preferably, the clear water tank is equipped with a multiple overflow structure and a filter structure for further overflow sedimentation and filtration of the clear water entering the clear water tank.

[0015] The filter assembly includes two-stage filter barrels, which are connected between the water outlet of the clear water tank and the spray water outlet of the grinding section, for end-point filtration of the clear water output from the clear water tank.

[0016] Preferably, the system further includes a clean water supply pipeline and a wastewater return pipeline. The clean water supply pipeline is connected between the filter assembly and the grinding section, and is used to supply clean water filtered by the filter assembly into the grinding section. The wastewater return pipeline is connected between the grinding section and the wastewater tank, and is used to return the grinding wastewater generated by the grinding section to the wastewater tank.

[0017] A method for recycling copper powder wastewater from PCB grinding stage, employing the aforementioned PCB grinding stage copper powder wastewater recycling system, the method comprising: S1. The grinding section performs grinding operations on the PCB board, generating grinding wastewater containing copper powder and resin impurities. S2. The grinding wastewater is returned to the wastewater tank through the wastewater return pipeline, and undergoes sedimentation and preliminary filtration in the wastewater tank through multiple layers of overflow and filter screen interception. S3. The operation status of the grinding section, the water inlet status of the sewage tank, and the filtration status of each copper powder centralized recovery tower in the copper powder centralized recovery tower group are collected by the status acquisition component, and the filtration load allocation result of each copper powder centralized recovery tower is determined by the allocation control unit based on the operation status, the water inlet status and the filtration status. S4. According to the filtration load allocation result, the sewage after sedimentation and preliminary filtration in the sewage tank is allocated to at least one copper powder centralized recovery tower in the copper powder centralized recovery tower group through the inlet distribution valve group, and the copper powder and resin impurities in the sewage are centrally intercepted and recovered through the copper powder centralized recovery tower. S5. The clean water filtered by the copper powder centralized recovery tower group is returned to the clean water tank, and overflow and filter again in the clean water tank; S6. The clean water output from the clean water tank enters the filter bucket group for further filtration; S7. The clean water filtered by the filter bucket group is re-supplied to the grinding section and used as the spray water for the grinding section.

[0018] The technical solution of the present invention may include the following beneficial effects: This invention recirculates copper-containing grinding wastewater from multiple grinding stages back to a wastewater tank. Within the tank, the wastewater undergoes sedimentation and preliminary filtration through multiple layers of overflow and filter screens, pre-separating copper powder, resin powder, and larger grinding impurities before they enter the centralized copper powder recovery tower. Compared to a decentralized treatment method where each grinding stage and filter tower corresponds to a separate process, this invention expands the wastewater sedimentation space, increases the buffering and interception process before filtration, and reduces the instantaneous filtration load on the subsequent centralized copper powder recovery tower, thereby improving the centralized recovery effect of copper powder and resin impurities.

[0019] This invention sends wastewater treated in a wastewater tank to a centralized copper powder recovery tower group for centralized interception and recovery. The filtered clean water is then returned to a clean water tank, where it undergoes further overflow filtration and final filtration by the filter assembly before being supplied back to the grinding section. This forms a circulating water system that integrates grinding wastewater return, centralized copper powder recovery, clean water purification, and spray reuse. This structure reduces the amount of fresh water replenished in the grinding section and the amount of copper-containing wastewater discharged. Furthermore, multiple centralized copper powder recovery towers can share the filtration task; while one tower requires cleaning or maintenance, the others can continue filtration, thus minimizing the impact of line downtime on continuous production.

[0020] This invention can also determine the filtration load distribution of each copper powder centralized recovery tower based on the operating status of the grinding section, the inlet water status of the wastewater tank, and the filtration status of each copper powder centralized recovery tower. The amount of wastewater entering each copper powder centralized recovery tower can be adjusted via the inlet distribution valve group. Therefore, wastewater distribution no longer relies solely on fixed pipelines or an average distribution method, but can be adjusted according to changes in grinding load, wastewater fluctuations, and the degree of blockage in individual towers. This allows copper powder centralized recovery towers with higher filtration loads to appropriately reduce their inlet water flow, while copper powder centralized recovery towers with better filtration load conditions can undertake more filtration tasks. This further extends the cleaning cycle of the copper powder centralized recovery towers, improves the continuity of the entire filtration line, and enhances the stability of the recycled water quality. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the PCB grinding section wastewater copper powder filtration and recycling water circulation system according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the pipeline connection of the PCB grinding section wastewater copper powder filtration and recycling water circulation system according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the process for recycling copper powder wastewater from PCB grinding section according to Embodiment 1 of the present invention. Figure 4 This is a schematic diagram of the process for the PCB grinding section wastewater copper powder filtration and recycling water recycling method in Embodiment 2 of the present invention.

[0022] Explanation of reference numerals in the attached figures: 1. Grinding section; 2. Filter tank assembly; 3. Copper powder centralized recovery tower assembly; 4. Wastewater tank; 5. Clean water tank. Detailed Implementation

[0023] Example 1 like Figures 1 to 3 As shown, this embodiment provides a PCB grinding section wastewater copper powder filtration and recycling water circulation system, which includes a grinding section 1, a filter tank group 2, a copper powder centralized recovery tower group 3, a wastewater tank 4, a clean water tank 5, a status acquisition component, a distribution control unit, and an inlet distribution valve group. Among them, Figure 1The overall three-dimensional layout of the system in this embodiment is shown. Figure 2 The connection relationship between the clean water pipeline and the sewage pipeline in this embodiment system is shown. Figure 3 The operation flow of the water circulation method in this embodiment is shown.

[0024] Grinding section 1 is used for grinding PCB boards, especially for grinding resin-filled PCB boards. During the grinding process, grinding section 1 requires water spraying in conjunction with grinding brushes, grinding wheels, or other grinding mechanisms for rinsing. The wastewater generated after grinding contains copper powder, resin powder, grinding particles, and other fine impurities, thus forming grinding wastewater. Multiple grinding sections 1 can be set up, arranged sequentially along the production line. The wastewater discharge end of each grinding section 1 is connected to a wastewater return pipeline, so that the grinding wastewater generated by each grinding section 1 no longer enters a separate filter tower, but instead flows back to wastewater tank 4 for centralized treatment.

[0025] Wastewater tank 4 is connected to grinding section 1 via a wastewater return pipeline. The grinding wastewater generated in grinding section 1 enters wastewater tank 4 through the wastewater return pipeline and undergoes sedimentation and preliminary filtration within it. Specifically, wastewater tank 4 is equipped with a multi-layer overflow structure and a filter screen structure. The multi-layer overflow structure can be formed by multiple baffles, overflow ports, or overflow channels, allowing the grinding wastewater entering wastewater tank 4 to flow sequentially through multiple sedimentation zones. The filter screen structure is located in the water flow channel or overflow channel of wastewater tank 4 to intercept larger particulate impurities in the wastewater. Through this structure, copper powder, resin powder, and some grinding impurities can settle or be intercepted by the filter screen within wastewater tank 4, thereby reducing the filtration load on the subsequent copper powder centralized recovery tower group 3.

[0026] A filter pump is installed between the wastewater tank 4 and the copper powder centralized recovery tower group 3. The inlet of the filter pump is connected to the outlet area of ​​the wastewater tank 4, and the outlet of the filter pump is connected to the main inlet pipe of the copper powder centralized recovery tower group 3. The wastewater, after sedimentation and preliminary filtration in the wastewater tank 4, is sent to the copper powder centralized recovery tower group 3 by the filter pump, thereby ensuring that the wastewater can stably enter the subsequent filtration and recovery stage.

[0027] The copper powder centralized recovery tower group 3 comprises multiple copper powder centralized recovery towers connected in parallel. Each copper powder centralized recovery tower has an inlet and an outlet, and its interior is equipped with a filtration and interception structure for intercepting copper powder, resin powder, and abrasive impurities. After the wastewater enters the copper powder centralized recovery tower group 3 through the inlet main pipe, it can be distributed to multiple copper powder centralized recovery towers for filtration. The copper powder and resin impurities in the wastewater are intercepted and collected by the copper powder centralized recovery towers. The filtered water flows from the outlets of the copper powder centralized recovery towers into the clear water tank 5.

[0028] Multiple copper powder centralized recovery towers are each equipped with corresponding inlet and outlet branches. This structure allows other centralized recovery towers to continue filtration operations while one tower needs cleaning or maintenance, avoiding the production line shutdown issue common in traditional structures where a filter tower in a specific grinding section needs clogging or maintenance. In this embodiment, wastewater from multiple grinding sections 1 is first collected in wastewater tank 4 for sedimentation before being sent to the copper powder centralized recovery tower group 3 for filtration. This prevents the first grinding section from continuously burdening a single filter tower due to its large cutting volume and high impurity content, thus extending maintenance cycles and improving continuous production efficiency. The briefing also clarifies that this system achieves multiple filtration stages and sedimentation space through centralized sedimentation and distribution filtration, and allows for the cleaning and maintenance of filter towers one by one while the production line is operating normally.

[0029] The clear water tank 5 is connected to the copper powder centralized recovery tower group 3 and is used to receive the clear water filtered by the copper powder centralized recovery tower group 3. The clear water tank 5 is also equipped with a multi-overflow structure and a filter screen structure, so that the water entering the clear water tank 5 can be subjected to overflow sedimentation and filter screen filtration again. The clear water tank 5 serves two purposes: firstly, to buffer and store the filtered clear water, and secondly, to further improve the quality of the recycled water and reduce the risk of fine copper powder, resin powder, or other impurities entering the spray system with the clear water.

[0030] Filter assembly 2 is connected between the clear water tank 5 and the grinding section 1. The outlet of the clear water tank 5 is connected to filter assembly 2 via a clear water supply pipeline, and the outlet of filter assembly 2 is connected to the spray water outlet of the grinding section 1 via a clear water supply pipeline. Filter assembly 2 is used to further filter the clear water output from the clear water tank 5, ensuring that the clear water completes final filtration before being returned to the grinding section 1. Filter assembly 2 may include two-stage filter barrels arranged along the direction of clear water flow; alternatively, parallel filter barrels may be used at each filtration stage to meet the needs of continuous water supply to the grinding section 1 and filter barrel cleaning and maintenance. The clear water filtered by filter assembly 2 is re-supplied to the grinding section 1 and recycled as spray water for the grinding section 1.

[0031] like Figure 2 As shown, the system includes a clean water supply pipeline and a wastewater return pipeline. The wastewater return pipeline is used to return the grinding wastewater generated in the grinding section 1 to the wastewater tank 4; the clean water supply pipeline is used to resupply the clean water that has been treated by the copper powder centralized recovery tower group 3, the clean water tank 5 and the filter barrel group 2 back into the grinding section 1. Figure 2 The direction marked "wastewater" indicates the direction in which grinding wastewater flows from grinding section 1 to wastewater tank 4, and the direction marked "clean water" indicates the direction in which filtered clean water is returned from clean water tank 5 and filter assembly 2 to grinding section 1. Thus, this embodiment forms a closed water circulation path of centralized return of grinding wastewater, centralized recovery of copper powder, re-filtration of clean water, and recycling of spray water.

[0032] This embodiment also includes a status acquisition component, a distribution control unit, and an inlet distribution valve group. The status acquisition component is correspondingly configured with the grinding section 1, the wastewater tank 4, and the copper powder centralized recovery tower group 3, respectively, and is used to acquire the operating status of the grinding section 1, the inlet status of the wastewater tank 4, and the filtration status of each copper powder centralized recovery tower in the copper powder centralized recovery tower group 3. The distribution control unit is connected to the status acquisition component and is used to determine the filtration load distribution result of each copper powder centralized recovery tower based on the operating status, inlet status, and filtration status. The inlet distribution valve group is connected between the wastewater tank 4 and the copper powder centralized recovery tower group 3, and is also connected to the distribution control unit, and is used to adjust the amount of wastewater entering each copper powder centralized recovery tower according to the filtration load distribution result. The specific acquisition methods, judgment methods, and distribution control methods of the status acquisition component, distribution control unit, and inlet distribution valve group are not further elaborated in this embodiment, but will be specifically described in subsequent embodiments.

[0033] The PCB grinding section wastewater copper powder filtration and recycling water recycling method in this embodiment includes the following steps: S1. Grinding section 1 performs grinding operations on the PCB board. The spray water in grinding section 1 washes the surface of the PCB board and the grinding position, so that the copper powder, resin powder and grinding particles generated during grinding are discharged with the water flow, forming grinding wastewater containing copper powder and resin impurities.

[0034] S2. Grinding wastewater is returned to wastewater tank 4 through the wastewater return pipeline. In wastewater tank 4, it undergoes sedimentation and preliminary filtration through multiple layers of overflow and filter screen interception. Larger particles of impurities are intercepted by the filter screen, while some copper powder, resin powder and grinding impurities settle in wastewater tank 4.

[0035] S3. The operating status of grinding section 1, the influent status of wastewater tank 4, and the filtration status of each copper powder centralized recovery tower in copper powder centralized recovery tower group 3 are collected by the status acquisition component. The allocation control unit determines the filtration load allocation result of each copper powder centralized recovery tower according to the operating status, influent status, and filtration status. This step is only used to connect the subsequent wastewater allocation process. The specific status parameters, calculation rules, and allocation algorithms are not elaborated in this embodiment.

[0036] S4. Based on the filtration load allocation results, the wastewater after sedimentation and preliminary filtration in wastewater tank 4 is distributed to at least one copper powder centralized recovery tower in copper powder centralized recovery tower group 3 via the inlet distribution valve group. The copper powder centralized recovery tower centrally intercepts and recovers copper powder and resin impurities in the wastewater. Multiple copper powder centralized recovery towers jointly undertake the filtration task, so that the grinding wastewater enters the multi-tower filtration stage after centralized sedimentation, avoiding a single filter tower from bearing excessively high impurity loads for a long time.

[0037] S5. The clean water filtered by the copper powder centralized recovery tower group 3 is returned to the clean water tank 5, and then overflows and is filtered again in the clean water tank 5, so that the filtered clean water is further buffered, settled and purified in the clean water tank 5.

[0038] S6. The clean water output from the clean water tank 5 enters the filter assembly 2 for further filtration. The filter assembly 2 intercepts residual fine impurities in the clean water at the end to improve the quality of the recycled water entering the spray system of the grinding section 1.

[0039] S7. The clean water filtered by the filter tank group 2 is re-supplied to the grinding section 1 and used as the spray water for the grinding section 1. Thus, the grinding wastewater generated in the grinding section 1 is treated in stages by the wastewater tank 4, the copper powder centralized recovery tower group 3, the clean water tank 5 and the filter tank group 2 before being returned to the grinding section 1, realizing the copper powder filtration and recovery and water recycling of the copper-containing wastewater in the PCB grinding section.

[0040] Through the above structure and method, this embodiment centrally recirculates the grinding wastewater generated by multiple grinding sections 1 to the wastewater tank 4 for treatment, then centrally intercepts and recovers it by the copper powder centralized recovery tower group 3, and finally further filters it through the clear water tank 5 and the filter barrel group 2 before resupplying it to the grinding section 1. Compared with the structure where the grinding sections and copper powder filter towers correspond one-to-one, this embodiment has a larger sedimentation space and more filtration stages, which can improve the interception effect of copper powder, resin impurities and grinding particles; at the same time, the parallel operation of multiple copper powder centralized recovery towers is beneficial for cleaning and maintaining individual copper powder centralized recovery towers without interrupting the production line, thereby improving the continuity of wastewater treatment and circulating water supply in the PCB grinding section.

[0041] Example 2 Based on the PCB grinding section wastewater copper powder filtration and recycling water circulation system and method described in Example 1, this example further optimizes the distribution method of the grinding wastewater after centralized sedimentation in wastewater tank 4 when it enters the copper powder centralized recovery tower group 3. This ensures that the status acquisition component, distribution control unit, and inlet distribution valve group form an executable closed-loop coordination relationship.

[0042] Specifically, the method of this embodiment includes the following steps: S1, Grinding section 1 performs grinding operations on the PCB board. During the grinding process, water is sprayed to wash the surface of the PCB board and the grinding position, so that the copper powder, resin powder and grinding particles generated during grinding are discharged with the water flow, forming grinding wastewater containing copper powder and resin impurities.

[0043] S2. Grinding wastewater is returned to wastewater tank 4 through the wastewater return pipeline. In wastewater tank 4, it undergoes sedimentation and preliminary filtration through multiple layers of overflow and filter screen interception. Larger particles of impurities are intercepted by the filter screen, while some copper powder, resin powder and grinding impurities settle in wastewater tank 4.

[0044] S3. The operation status of grinding section 1, the water inlet status of sewage tank 4, and the filtration status of each copper powder centralized recovery tower in copper powder centralized recovery tower group 3 are collected by the status acquisition component, and the filtration load allocation result of each copper powder centralized recovery tower is determined by the allocation control unit based on the operation status, the water inlet status and the filtration status.

[0045] Specifically, S3 includes the following steps: S3.1 The system status data at the current sampling time is formed by collecting the operating status of grinding section 1, the water inlet status of sewage tank 4, and the filtration status of each copper powder centralized recovery tower in copper powder centralized recovery tower group 3 through the status acquisition component.

[0046] S3.2 The allocation and control unit calculates the comprehensive load factor X on the sewage side based on the operating status of the grinding section 1, the water inlet status of the sewage tank 4, and the solid content of the sewage. The comprehensive load factor X on the sewage side is used to characterize the total load of the sewage to be treated currently entering the copper powder centralized recovery tower group 3.

[0047] S3.3 The distribution control unit calculates the clogging load coefficient Y of each copper powder centralized recovery tower according to the inlet water state of sewage tank 4, the solid content state of sewage and the filtration state of each copper powder centralized recovery tower. The clogging load coefficient Y is used to characterize the filtration load state of each copper powder centralized recovery tower under the current inlet water conditions.

[0048] S3.4 The distribution control unit generates a filtration load distribution result based on the comprehensive load coefficient X on the sewage side and the blockage load coefficient Y of each copper powder centralized recovery tower. The filtration load distribution result includes the number of the copper powder centralized recovery tower participating in filtration, the target influent flow rate of the corresponding copper powder centralized recovery tower, and the target opening degree of the corresponding valve in the influent distribution valve group.

[0049] S4. Based on the filtration load allocation result, the wastewater after sedimentation and preliminary filtration in the wastewater tank 4 is allocated to at least one copper powder centralized recovery tower in the copper powder centralized recovery tower group 3 through the inlet water distribution valve group. The copper powder and resin impurities in the wastewater are centrally intercepted and recovered through the copper powder centralized recovery tower.

[0050] S5. The clean water filtered by the copper powder centralized recovery tower group 3 is returned to the clean water tank 5, and then overflows and is filtered again in the clean water tank 5, so that the filtered clean water is further buffered, settled and purified in the clean water tank 5.

[0051] S6. The clean water output from the clean water tank 5 enters the filter assembly 2 for further filtration. The filter assembly 2 intercepts residual fine impurities in the clean water at the end.

[0052] S7. The clean water filtered by the filter group 2 is re-supplied to the grinding section 1 and used as the spray water for the grinding section 1.

[0053] In this embodiment, the status acquisition component includes a grinding section operation status acquisition device, a sewage tank inlet status acquisition device, and a recovery tower filtration status acquisition device. The grinding section operation status acquisition device is configured corresponding to grinding section 1 and is used to acquire the operation status of grinding section 1. Optionally, the grinding section operation status acquisition device includes at least one of a grinding motor current acquisition module, a conveying speed acquisition module, a grinding section operation signal acquisition module, and a spray start signal acquisition module. The grinding motor current acquisition module is used to acquire the operating current of the grinding motor in grinding section 1, and the distribution control unit converts this current into the equivalent grinding power of grinding section 1; the conveying speed acquisition module is used to acquire the conveying speed of the PCB board through grinding section 1; the grinding section operation signal acquisition module is used to acquire the start / stop status of each grinding section 1; and the spray start signal acquisition module is used to determine whether the corresponding grinding section 1 is in actual water use and drainage status. Preferably, when there are multiple grinding sections 1, each grinding section 1 is equipped with at least one grinding section operation status acquisition device so that the distribution control unit can obtain the comprehensive operating load of multiple grinding sections 1.

[0054] A wastewater inlet status acquisition device is installed corresponding to wastewater tank 4 to collect the inlet status of wastewater tank 4. Optionally, the wastewater inlet status acquisition device includes a wastewater tank level gauge, a wastewater tank outlet main flow meter, and a wastewater solids content acquisition device. The wastewater tank level gauge is used to collect the liquid level height in wastewater tank 4, with a sampling resolution preferably of 1 mm to 5 mm; the wastewater tank outlet main flow meter is installed on the inlet main pipe from wastewater tank 4 to copper powder centralized recovery tower group 3 to collect the total inlet flow rate of wastewater tank 4 to copper powder centralized recovery tower group 3, with a sampling resolution preferably of 0.01 m. 3 / h to 0.05m 3 / h; Wastewater solids state sampling devices are used to characterize the combined content of copper powder, resin powder, and abrasive particles in wastewater. Optionally, the wastewater solids state sampling device can be a turbidity sensor, a suspended solids concentration sensor, or a sampling online solids content detector; when a turbidity sensor is used, the distribution control unit can convert the turbidity signal into a solids concentration, in units of kg / m³, based on a pre-calibrated relationship between turbidity and solids content. 3 .

[0055] The filtration status acquisition devices for each copper powder centralized recovery tower in copper powder centralized recovery tower group 3 are respectively installed. Each copper powder centralized recovery tower has a pre-tower pressure acquisition device on its inlet branch and a post-tower pressure acquisition device and a branch flow acquisition device on its outlet branch. The pre-tower and post-tower pressure acquisition devices are used to obtain the filtration pressure difference of the corresponding copper powder centralized recovery tower, and the branch flow acquisition device is used to obtain the actual branch flow of the corresponding copper powder centralized recovery tower. Each copper powder centralized recovery tower can also be equipped with an operation timing unit to record the cumulative operating time of the copper powder centralized recovery tower since the last cleaning and maintenance. Preferably, the sampling resolution of the pre-tower and post-tower pressure acquisition devices is 0.1 kPa to 1 kPa, and the sampling resolution of the branch flow acquisition device is 0.01 m... 3 / h to 0.05m 3 / h, the recording unit for the running timing unit is 1min.

[0056] The distribution control unit can be a PLC controller, an industrial controller, or a control module with analog input, digital input, valve control output, and data storage functions. The distribution control unit is connected to the status acquisition component and the inlet distribution valve group, receiving flow rate, liquid level, pressure, operating status, grinding current, spray opening status, and valve position feedback signals output by the status acquisition component. It then outputs valve control signals based on the calculation results in S3.2, S3.3, and S3.4. The distribution control unit stores the rated processing flow rate from wastewater tank 4 to copper powder centralized recovery tower group 3, the designed solids concentration, the rated total grinding power of multiple grinding sections 1, the rated branch flow rate of each copper powder centralized recovery tower, the rated filtration differential pressure of each copper powder centralized recovery tower, the rated operating cycle of each copper powder centralized recovery tower, and the calibration relationship between valve opening and branch flow rate.

[0057] The inlet distribution valve assembly is connected between the wastewater tank 4 and the copper powder centralized recovery tower assembly 3. The inlet distribution valve assembly includes multiple inlet branches connected to the main inlet pipe of the copper powder centralized recovery tower assembly 3. Each inlet branch is connected to one copper powder centralized recovery tower, and each inlet branch is equipped with an electric regulating valve or an electric shut-off valve. Preferably, each inlet branch is equipped with an electric regulating valve and a valve position feedback device. The valve position feedback device feeds back the current valve opening to the distribution control unit. The distribution control unit adjusts the opening of each electric regulating valve according to the filtration load distribution result, so that each copper powder centralized recovery tower receives wastewater according to the target inlet flow rate. Optionally, when only electric shut-off valves are used, the distribution control unit achieves distribution by switching the number of copper powder centralized recovery towers participating in filtration and the opening time ratio of each inlet branch valve; when electric regulating valves are used, the distribution control unit continuously adjusts the valve opening according to the target inlet flow rate to achieve a more stable wastewater distribution.

[0058] In S3.1, the distribution control unit receives data from the status acquisition component at a fixed sampling period. Preferably, the sampling period is 1 to 5 seconds, with a rolling time window of 30 to 120 seconds for smoothing. In this embodiment, the preferred sampling period is 1 second, and the rolling time window is 60 seconds. For pressure, flow, and level signals, the distribution control unit first uses median filtering of 5 consecutive sampling points to remove instantaneous spikes, and then calculates the average value within the 60-second time window. For grinding section operation signals and spray start signals, the distribution control unit adopts a switch-state hold mode, which does not change the current judgment result when the duration of the same state is less than 3 seconds, thus avoiding frequent operation of the inlet distribution valve group caused by the instantaneous start and stop of grinding section 1. For wastewater solids-containing state signals, when the change in the amplitude of two adjacent sampled values ​​exceeds the preset abrupt change threshold and the duration is less than 5 seconds, the allocation control unit uses the effective value of the previous time window for calculation; when the signal missing time does not exceed 5 seconds, the data of the previous effective time window is used; when any key acquisition signal is missing for more than 5 seconds and cannot be replaced by other signals, the allocation control unit enters a degraded operation state, evenly distributing wastewater according to the number of available copper powder centralized recovery towers, and issuing a maintenance signal. If the liquid level in wastewater tank 4 is higher than the preset high liquid level threshold, the allocation control unit prioritizes increasing the number of copper powder centralized recovery towers participating in filtration; if the filtration pressure difference of any copper powder centralized recovery tower is higher than the maintenance threshold, that copper powder centralized recovery tower will no longer be a priority allocation target.

[0059] In S3.2, the allocation control unit calculates the comprehensive load factor X on the wastewater side based on the total influent flow rate from the wastewater tank 4 to the copper powder centralized recovery tower group 3, the equivalent solids concentration of the wastewater, and the equivalent grinding power of the multiple grinding sections 1. The total influent flow rate reflects the water load of the wastewater transported from the wastewater tank 4 to the copper powder centralized recovery tower group 3, the equivalent solids concentration of the wastewater reflects the material load of copper powder, resin powder, and grinding particles, and the equivalent grinding power of the multiple grinding sections 1 reflects the current grinding and cutting intensity. Among the above parameters, the total influent flow rate and the equivalent solids concentration of the wastewater are used as state parameters in both S3.2 and S3.3, and the equivalent grinding power is used as the working intensity parameter in S3.2, so that the comprehensive load factor X on the wastewater side simultaneously reflects changes in water volume, solids content, and grinding load.

[0060] The comprehensive load factor X on the wastewater side is calculated according to the following formula: ; Where X(t) is the comprehensive load coefficient of the sewage side at time t, which is dimensionless and ranges from 0 to 1; Q Σ (t) represents the total influent flow rate from wastewater tank 4 to the influent main pipe of copper powder centralized recovery tower group 3 at time t, in m³ / s. 3 / h;Q N The rated treatment flow rate is given by the main inlet pipe from wastewater tank 4 to copper powder centralized recovery tower group 3, in m³ / s.3 / h;C s (t) represents the solids concentration of the wastewater output from wastewater tank 4 at time t, in kg / m³. 3 C N The design solids concentration is given in kg / m³; P m (t) represents the equivalent grinding power of multiple grinding sections 1 at time t, in kW; P N Q represents the rated total grinding power of multiple grinding sections 1, in kW. N C N and P N These are all rated parameters determined during system design or debugging. m X(t) can be calculated from the grinding motor current, rated voltage, and power factor of each grinding section 1, or it can be obtained directly from the grinding power signal output by the equipment control system. Through the above formula, X(t) can increase with the increase of total influent flow rate, increase of solids concentration, or increase of grinding power, thus reflecting the comprehensive sewage treatment pressure before entering the copper powder centralized recovery tower group 3.

[0061] In S3.3, the allocation control unit calculates the clogging load factor Y for each copper powder centralized recovery tower in the copper powder centralized recovery tower group 3. The clogging load factor Y simultaneously considers the total influent flow rate of the wastewater tank 4, the equivalent solids concentration of the wastewater, the filtration differential pressure of a single copper powder centralized recovery tower, the single-tower branch flow rate, and the cumulative operating time of the copper powder centralized recovery tower since its last cleaning and maintenance. The total influent flow rate and the equivalent solids concentration of the wastewater are the same parameters as in S3.2, ensuring that the comprehensive wastewater load obtained in S3.2 and the single-tower clogging load obtained in S3.3 are under the same wastewater source conditions. The filtration differential pressure, branch flow rate, and cumulative operating time are unique single-tower filtration status parameters in S3.3, used to reflect the actual degree of clogging and the continuous load capacity of each copper powder centralized recovery tower.

[0062] For the i-th copper powder centralized recovery tower, its blockage load factor Y i Calculate using the following formula: ; Among them, Y i (t) represents the blockage load coefficient of the i-th copper powder centralized recovery tower at time t, which is dimensionless; Δp i (t) represents the filtration pressure difference of the i-th copper powder centralized recovery tower at time t, in kPa; Q iN The rated branch flow rate of the i-th copper powder centralized recovery tower is expressed in m³ / s. 3 / h;Δp iN q represents the rated filtration pressure difference of the i-th copper powder centralized recovery tower under the rated branch flow rate, in kPa; i(t) represents the actual branch flow rate of the i-th copper powder centralized recovery tower at time t, in m³ / s. 3 / h;τ i (t) represents the cumulative operating time of the i-th copper powder centralized recovery tower since the last cleaning and maintenance, in hours; τ iN The rated operating cycle of the i-th copper powder centralized recovery tower is expressed in hours (h). Copper powder centralized recovery towers that are shut down or under maintenance are not included in the current clogging load coefficient allocation. For newly commissioned copper powder centralized recovery towers, the allocation control unit first controls the corresponding inlet branch to perform a short-term trial run at no more than 30% of the rated branch flow rate. Only after obtaining effective filtration differential pressure and branch flow rate are they included in the calculation. Using the above formula, when a copper powder centralized recovery tower experiences an increase in filtration differential pressure at the same flow rate, a decrease in branch flow rate at the same differential pressure, or a cumulative operating time approaching the rated operating cycle, the clogging load coefficient Y of that copper powder centralized recovery tower is calculated. i As the amount of wastewater allocated to the copper powder centralized recovery tower increases, the amount of wastewater allocated to it in subsequent S3.4 will decrease accordingly.

[0063] In S3.4, the allocation control unit generates a filtration load allocation result based on the wastewater-side comprehensive load coefficient X and the clogging load coefficient Y of each copper powder centralized recovery tower. This filtration load allocation result is not simply an average flow rate value, but includes the set of copper powder centralized recovery towers participating in filtration, the target influent flow rate of each participating copper powder centralized recovery tower, and the target opening degree of the corresponding valve in the influent distribution valve group. Preferably, the allocation control unit first determines the number of copper powder centralized recovery towers that need to participate in filtration based on X, and then determines the specific participating towers and target influent flow rate based on the Y value of each copper powder centralized recovery tower. Copper powder centralized recovery towers with smaller Y values ​​indicate that their current filtration capacity is better and can handle a relatively high wastewater volume; copper powder centralized recovery towers with larger Y values ​​indicate that their current clogging load is higher, and their allocation should be reduced or they should be removed from priority allocation.

[0064] The filter load allocation result is determined according to the following formula: ; ; ; Where R(t) is the set of filtration load allocation results at time t; i is the number of the copper powder centralized recovery tower; Ω(t) is the set of copper powder centralized recovery towers participating in filtration at time t; The target influent flow rate for the i-th copper powder centralized recovery tower is expressed in m³. 3 / h;u i (t) represents the target valve opening on the inlet branch corresponding to the i-th copper powder centralized recovery tower, in %; g iThe valve opening-flow calibration function for the i-th inlet branch is pre-stored in the distribution control unit. Ω(t) is selected by the distribution control unit from copper powder centralized recovery towers that are not under maintenance and whose clogging load coefficient Y is lower than the shutdown judgment threshold. The selection is based on the order of clogging load coefficient Y from smallest to largest. The number of copper powder centralized recovery towers participating in filtration is determined based on the comprehensive load coefficient X on the wastewater side, the total inlet flow from wastewater tank 4 to copper powder centralized recovery tower group 3, and the rated branch flow of a single copper powder centralized recovery tower. The shutdown judgment threshold is preferably between 1.3 and 1.8. If the target inlet flow of a copper powder centralized recovery tower exceeds its rated branch flow, the distribution control unit limits the target inlet flow of that copper powder centralized recovery tower to within the rated branch flow and redistributes the remaining flow according to the reciprocal of the clogging load coefficient Y of the remaining participating copper powder centralized recovery towers. If the number of copper powder recovery towers that can participate in filtration is insufficient to handle the current total influent flow, the distribution control unit will issue a maintenance or reduce influent prompt, and prioritize maintaining a stable spray water supply from the clear water tank 5 to the grinding section 1.

[0065] In this embodiment, the allocation control unit adopts a hierarchical execution architecture. The first layer is the data acquisition layer, which receives analog signals, digital signals, and valve position feedback signals output by the status acquisition component. The second layer is the data preprocessing layer, which performs sampled value verification, median filtering, time window averaging, outlier removal, and missing value processing. The third layer is the load calculation layer, which calculates the comprehensive load coefficient X on the wastewater side according to S3.2 and the blockage load coefficient Y of each copper powder centralized recovery tower according to S3.3. The fourth layer is the allocation decision layer, which forms the filtration load allocation result according to S3.4. The fifth layer is the valve execution layer, which converts the filtration load allocation result into valve opening commands for the inlet distribution valve group. The above execution architecture can be deployed in a PLC controller or industrial controller. The status acquisition component is connected to the allocation control unit through an analog input module, a digital input module, or a fieldbus. The inlet distribution valve group receives control commands from the allocation control unit through an analog output module, a digital output module, or a fieldbus.

[0066] In terms of variable representation, the allocation control unit generates a set of system state data at each sampling time. This system state data includes the total influent flow rate from wastewater tank 4 to copper powder centralized recovery tower group 3, the equivalent solids concentration in the wastewater, the equivalent grinding power of multiple grinding sections 1, the liquid level in wastewater tank 4, and the filtration differential pressure, branch flow rate, cumulative operating time, and valve position feedback for each copper powder centralized recovery tower. If the number of copper powder centralized recovery towers is M, the system state data includes fields related to the overall wastewater state and multiple sets of fields corresponding to each of the M copper powder centralized recovery towers. The control results output by the allocation control unit include a target influent flow vector and a valve opening vector. Each item in the target influent flow vector corresponds to the target influent flow rate of a copper powder centralized recovery tower, and each item in the valve opening vector corresponds to the target opening of a valve in the influent distribution valve group. Thus, the input data, calculated variables, and output control quantities correspond one-to-one with the physical structure of the copper powder centralized recovery tower group 3, enabling direct control of the wastewater distribution process in S4.

[0067] This embodiment does not rely on an offline training model. To ensure that the calculation parameters are consistent with the field equipment, calibration is performed before the system is put into use. First, with clean water, the inlet branches corresponding to each copper powder centralized recovery tower are opened, and the branch flow rates at different valve openings are recorded to obtain the valve opening-flow rate calibration function g. i Secondly, when the filter media of the copper powder centralized recovery tower is in a clean state, it operates at the rated branch flow rate, and the rated filtration pressure difference ΔpiN of each copper powder centralized recovery tower is recorded; thirdly, based on the sampling and testing results under normal grinding conditions of the production line, the output value of the wastewater solids state acquisition device is calibrated as the solids concentration C. s Finally, Q is determined based on the rated processing capacity of the equipment. N C N P N Q iN Q T and τ iN Optionally, the calibration data can be corrected using data from 3 to 7 consecutive production shifts; when the filter media model, number of grinding sections 1, or pipeline structure of the copper powder centralized recovery tower changes, the valve opening-flow rate calibration and rated filtration differential pressure calibration should be performed again.

[0068] During online operation, the allocation control unit executes cycles from S3.1 to S3.4. In each cycle, the allocation control unit first reads the valid status data within the most recent time window, then calculates the comprehensive load coefficient X on the wastewater side and the clogging load coefficient Y of each copper powder centralized recovery tower. Subsequently, it determines the number of copper powder centralized recovery towers participating in filtration based on X, and selects the copper powder centralized recovery towers to participate in filtration in ascending order of Y value. When the Y value of a copper powder centralized recovery tower is higher than the shutdown judgment threshold for multiple consecutive time windows, the allocation control unit removes that copper powder centralized recovery tower from the priority allocation list and lowers or closes its corresponding inlet branch valve, putting it into a state awaiting cleaning and maintenance; other copper powder centralized recovery towers continue to receive wastewater according to the filtration load allocation results, thereby ensuring the continuity of the entire filtration line. Preferably, to avoid frequent operation of the inlet distribution valve group, the distribution control unit is set with a minimum holding time, which is 30s to 180s; when the change in the target valve opening calculated for two consecutive time windows is less than 3%, the current valve opening is maintained unchanged; when the liquid level in the sewage tank 4 rises rapidly, the minimum holding time is allowed to be shortened and the number of copper powder centralized recovery towers participating in filtration is increased in priority.

[0069] Through the structure and method described in this embodiment, after the copper-containing grinding wastewater generated from multiple grinding sections 1 enters the wastewater tank 4, the system can identify the overall load on the wastewater side and the blockage load of each copper powder centralized recovery tower before the wastewater enters the copper powder centralized recovery tower group 3, and adjust the inlet water flow of each copper powder centralized recovery tower through the inlet distribution valve group. Compared with fixed pipelines or average distribution methods, this embodiment can reduce the long-term high-load operation of some copper powder centralized recovery towers, extend the cleaning cycle of copper powder centralized recovery towers, and maintain the filtration of other copper powder centralized recovery towers when a single copper powder centralized recovery tower needs cleaning and maintenance, thereby improving the continuous operation capability and the stability of the recycled water quality of the PCB grinding section wastewater copper powder filtration and recovery water circulation system.

Claims

1. A wastewater copper powder filtration and recycling system for PCB grinding sections, characterized in that, include: It includes a grinding section (1), a filter barrel group (2), a copper powder centralized recovery tower group (3), a sewage tank (4), a clear water tank (5), a status acquisition component, a distribution control unit, and an inlet distribution valve group; The grinding section (1) is used to grind the PCB board and generate grinding wastewater containing copper powder and resin impurities. The wastewater tank (4) is connected to the grinding section (1) through a wastewater return pipeline, and is used to receive the grinding wastewater generated by the grinding section (1) and to perform sedimentation and preliminary filtration on the grinding wastewater; The copper powder centralized recovery tower group (3) is connected to the sewage tank (4) and is used to centrally filter the sewage after sedimentation and preliminary filtration in the sewage tank (4) and intercept and recover copper powder and resin impurities in the sewage. The clear water tank (5) is connected to the copper powder centralized recovery tower group (3) and is used to receive the clear water filtered by the copper powder centralized recovery tower group (3) and to perform further sedimentation and filtration on the clear water; The filter tank assembly (2) is connected between the clear water tank (5) and the grinding section (1) for further filtering the clear water output from the clear water tank (5) and returning the filtered clear water to the grinding section (1) for use. The status acquisition components are respectively set up with the grinding section (1), the sewage tank (4) and the copper powder centralized recovery tower group (3) to collect the operation status of the grinding section (1), the water inlet status of the sewage tank (4) and the filtration status of each copper powder centralized recovery tower in the copper powder centralized recovery tower group (3). The allocation control unit is connected to the status acquisition component and is used to determine the filtration load allocation result of each copper powder centralized recovery tower according to the operation status, the water inlet status and the filtration status. The inlet distribution valve group is connected between the sewage tank (4) and the copper powder centralized recovery tower group (3), and is connected to the distribution control unit, for adjusting the amount of sewage entering each copper powder centralized recovery tower according to the filtration load distribution result.

2. The PCB grinding section wastewater copper powder filtration and recycling water circulation system according to claim 1, characterized in that, The grinding section (1) is provided in multiple ways. Each of the multiple grinding sections (1) is connected to the sewage tank (4) through the sewage return pipeline, so that the grinding sewage generated by the multiple grinding sections (1) is concentrated and returned to the sewage tank (4).

3. The PCB grinding section wastewater copper powder filtration and recycling water circulation system according to claim 2, characterized in that, The wastewater tank (4) is equipped with a multi-layer overflow structure and a filter screen structure. The grinding wastewater passes through the multi-layer overflow sedimentation and filter screen interception in the wastewater tank (4) and is then output to the copper powder centralized recovery tower group (3).

4. The PCB grinding section wastewater copper powder filtration and recycling water circulation system according to claim 3, characterized in that, A filter pump is installed between the sewage tank (4) and the copper powder centralized recovery tower group (3). The filter pump is used to transport the sewage after sedimentation and preliminary filtration in the sewage tank (4) to the copper powder centralized recovery tower group (3).

5. A PCB grinding section wastewater copper powder filtration and recycling water circulation system according to claim 4, characterized in that, The copper powder centralized recovery tower group (3) includes multiple copper powder centralized recovery towers, which are connected in parallel to receive sewage from the sewage tank (4) and distribute the sewage after sedimentation and preliminary filtration in the sewage tank (4) to the multiple copper powder centralized recovery towers for filtration.

6. A PCB grinding section wastewater copper powder filtration and recycling water circulation system according to claim 5, characterized in that, Each of the copper powder centralized recovery towers is equipped with an inlet water pipe and an outlet water pipe, and any one of the copper powder centralized recovery towers can be cleaned or maintained while the other copper powder centralized recovery towers are still in filtration operation.

7. A PCB grinding section wastewater copper powder filtration and recycling water circulation system according to claim 6, characterized in that, The clear water tank (5) is equipped with a multiple overflow structure and a filter screen structure, which are used to allow the clear water entering the clear water tank (5) to overflow and settle again and be filtered by the filter screen.

8. A PCB grinding section wastewater copper powder filtration and recycling water circulation system according to claim 6, characterized in that, The filter assembly (2) includes two-stage filter barrels, which are connected between the water outlet of the clear water tank (5) and the spray water outlet of the grinding section (1) for end-of-pipe filtration of the clear water output from the clear water tank (5).

9. A PCB grinding section wastewater copper powder filtration and recycling water circulation system according to claim 6, characterized in that, The system also includes a clean water supply pipeline and a wastewater return pipeline. The clean water supply pipeline is connected between the filter barrel group (2) and the grinding section (1) and is used to supply clean water filtered by the filter barrel group (2) into the grinding section (1). The wastewater return pipeline is connected between the grinding section (1) and the wastewater tank (4) and is used to return the grinding wastewater generated by the grinding section (1) to the wastewater tank (4).

10. A method for filtering and recycling copper powder wastewater from PCB grinding processes, characterized in that, The PCB grinding section wastewater copper powder filtration and recycling water circulation system according to any one of claims 1 to 9, the method comprising: S1, Grinding section (1) performs grinding operations on the PCB board, generating grinding wastewater containing copper powder and resin impurities; S2, the grinding wastewater is returned to the wastewater tank (4) through the wastewater return pipeline, and is settled and initially filtered in the wastewater tank (4) through multiple layers of overflow and filter screen interception; S3. The operation status of the grinding section (1), the water inlet status of the sewage tank (4) and the filtration status of each copper powder centralized recovery tower in the copper powder centralized recovery tower group (3) are collected by the status acquisition component, and the filtration load allocation result of each copper powder centralized recovery tower is determined by the allocation control unit based on the operation status, the water inlet status and the filtration status. S4. According to the filtration load allocation result, the sewage after sedimentation and preliminary filtration in the sewage tank (4) is allocated to at least one copper powder centralized recovery tower in the copper powder centralized recovery tower group (3) through the inlet water distribution valve group, and the copper powder and resin impurities in the sewage are centrally intercepted and recovered through the copper powder centralized recovery tower. S5. The clean water filtered by the copper powder centralized recovery tower group (3) is returned to the clean water tank (5) and overflowed and filtered again in the clean water tank (5). S6. The clean water output from the clean water tank (5) enters the filter bucket group (2) for further filtration; S7. The clean water filtered by the filter bucket group (2) is re-supplied to the grinding section (1) and used as the spray water for the grinding section (1) in a cycle.

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