Electroplating pretreatment system and control method thereof

Abstract

This application relates to the field of electroplating pretreatment technology, and in particular to an electroplating pretreatment system and its control method. The system includes multiple process tanks arranged sequentially along the workpiece processing direction. Each process tank has a guide plate with multiple guide holes, which separate a processing zone and a distribution zone within the process tank. The guide holes are connected to the processing zone and the distribution zone, respectively. A circulating filtration module, equal in number to and corresponding to each process tank, is also included. One end of the circulating filtration module is connected to the processing zone, and the other end is connected to the distribution zone. The circulating filtration module extracts liquid from the processing zone, filters it, and then sends it to the distribution zone. A detection module, also equal in number to and corresponding to each process tank, is also included. A transport module, positioned above the process tanks, is used to transport workpiece baskets between the multiple process tanks. This application improves the uniformity of the electroplating pretreatment process.

Description

Technical Field

[0001] This application relates to the field of electroplating pretreatment technology, and in particular to an electroplating pretreatment system and its control method. Background Technology

[0002] Electroplating is a surface treatment process that deposits a metal coating on the surface of a metal workpiece using electrochemical methods. It is widely used in automotive parts, electronic components, aerospace parts, and other fields. The quality of the electroplated layer depends on the adhesion between the coating and the substrate, and the quality of this adhesion is largely determined by the quality of the pretreatment process. The purpose of pretreatment is to remove oil, natural oxide films, and other impurities from the workpiece surface and to form an active surface suitable for electroplating adhesion. Taking chromium plating on aluminum alloy workpieces as an example, a typical pretreatment process includes multiple steps such as alkaline etching and degreasing, water washing, descaling, water washing, micro-etching, water washing, zinc immersion, and water washing. The workpiece is sequentially immersed in the corresponding reaction tank for each step of the chemical treatment. Each step has strict requirements for the temperature, concentration, and immersion time of the chemical solution; deviations in any step's parameters can lead to substandard final plating quality.

[0003] In related technologies, electroplating pretreatment production lines typically employ a layout where multiple process tanks are arranged sequentially along the workpiece processing direction. A gantry-type transport device moves workpiece baskets between the tanks, and a controller manages the temperature and electrolyte replenishment of each tank. Regarding chemical solution monitoring, existing production lines typically install a temperature sensor and a concentration sensor in the middle of the side wall of each reaction tank. A single-point measurement represents the overall chemical solution status of the tank, and the controller adjusts the temperature and compensates for concentration based on this measurement. For chemical solution maintenance, existing production lines usually manage solution lifespan through periodic solution changes, i.e., replacing the chemicals in the tank at fixed intervals.

[0004] Regarding the aforementioned technologies: the chemical solutions in the process tank exhibit significant spatial unevenness in temperature and concentration. For example, in the alkaline etching tank, there is a significant temperature difference between the area near and away from the heating pipe. The high-density sodium aluminate produced by the alkaline etching reaction settles to the bottom, resulting in a significant difference in concentration between the upper and lower layers. Relying solely on a single-point sensor installed in the middle of the tank sidewall to obtain an intermediate value to represent the state of the chemical solution in the entire tank is insufficient. This single-point value cannot reflect the spatial distribution of the chemical solution temperature and concentration, nor can it reflect the actual state of the chemical solution in contact with workpieces at different positions within the hanging basket. The controller controls process parameters based on this unrepresentative single-point value, which cannot guarantee that workpieces at different positions within the same hanging basket are all under qualified chemical solution conditions. This can easily lead to inconsistent processing results for the same batch of workpieces, making it difficult to guarantee the uniformity of the electroplating pretreatment process. Summary of the Invention

[0005] To improve the uniformity of the electroplating pretreatment process, this application provides an electroplating pretreatment system and its control method.

[0006] Firstly, this application provides an electroplating pretreatment system, which adopts the following technical solution:

[0007] An electroplating pretreatment system, comprising:

[0008] Multiple process tanks are provided, and the multiple process tanks are arranged sequentially along the workpiece processing direction. A guide plate is provided in the process tank, and multiple guide holes are opened on the guide plate. The guide plate is used to separate a processing area and a distribution area in the process tank. The processing area is located above the distribution area, and the guide holes are respectively connected to the processing area and the distribution area.

[0009] The number of circulating filtration modules is equal to and corresponds one-to-one with the number of the process tanks. One end of the circulating filtration module is connected to the processing area, and the other end of the circulating filtration module is connected to the distribution area. The circulating filtration module is used to extract the liquid in the processing area, filter it, and send it to the distribution area.

[0010] The number of detection modules is equal to the number of the process tanks. Each detection module is set in one of the processing areas. The detection modules are used to detect the liquid temperature and concentration in different areas of the processing area.

[0011] A transport module is disposed above the process tank, and the transport module is used to transport workpiece baskets between multiple process tanks.

[0012] By adopting the above technical solution, the guide plate divides the internal space of the process tank into an upper processing zone and a lower distribution zone. The circulating filtration module extracts the liquid from the upper part of the processing zone, filters it, and sends it to the lower distribution zone. Under pressure, the liquid in the distribution zone flows evenly upward into the processing zone through multiple guide holes on the guide plate, thus forming a uniform flow field from bottom to top within the processing zone. This ensures that the workpiece is always in a flowing, uniform processing liquid environment, effectively eliminating stratification of liquid temperature and concentration and local dead zones within the tank, which is beneficial to improving the uniformity and consistency of the pretreatment effect. Simultaneously, the detection module can monitor the liquid temperature and concentration in different areas of the processing zone in real time, providing a data basis for precise control of process parameters. The handling module realizes automated transfer of workpieces between multiple process tanks, improving production efficiency.

[0013] Optionally, the diameter of the plurality of flow guide holes gradually decreases from the center region of the flow guide plate to the edge region.

[0014] By adopting the above technical solution, since the return liquid pipeline injects liquid from the side wall of the distribution area, the liquid pressure in the edge area near the side wall is higher than the liquid pressure in the center area away from the side wall. By designing the orifice diameter of the guide hole to gradually decrease from the center to the edge, the smaller orifice diameter in the edge area increases the flow resistance in the edge area, while the larger orifice diameter in the center area reduces the flow resistance in the center area. This compensates for the pressure difference between the edge and the center in the distribution area, making the flow rate of liquid through the guide plate more uniform at all positions. This is conducive to forming a uniform upward flow field in the processing area, so that all parts of the workpiece can obtain a consistent processing effect.

[0015] Optionally, the bottom of the process tank is provided with an inclined bottom plate that slopes towards the center. A collection tank is provided at the center of the inclined bottom plate. A drain valve is provided at the bottom of the collection tank. A first turbidity sensor is provided in the collection tank. The sediment that passes through the guide hole and settles into the distribution area slides into the collection tank along the inclined bottom plate.

[0016] By adopting the above technical solution, the inclined bottom plate uses gravity to automatically guide solid particles, sediments, and other impurities generated during the treatment process to the collection tank at the center. The first turbidity sensor can monitor the turbidity of the sediment in the collection tank in real time. When the turbidity reaches a set threshold, the sediment can be discharged through the drain valve, realizing the automatic collection of pollutants at the bottom of the tank and automatic discharge based on turbidity monitoring. This reduces the frequency and labor intensity of manual cleaning while maintaining the cleanliness of the treated liquid.

[0017] Optionally, the circulating filtration module includes an outlet pipe, a circulating pump, a filter, and a return pipe connected in sequence. The end of the outlet pipe away from the circulating pump is connected to the top of the processing zone. A filter screen is provided at the end of the outlet pipe near the processing zone. The end of the return pipe away from the filter is connected to the distribution zone. A second turbidity sensor is provided in the processing zone.

[0018] By adopting the above technical solution, the liquid outlet pipeline draws liquid from the top of the treatment zone, and a filter screen is installed at the inlet for preliminary filtration to prevent large particles of impurities from entering the circulation pump and causing damage. After being pressurized by the circulation pump, the liquid enters the filter for fine filtration, and the filtered clean liquid is sent to the distribution zone through the return pipeline. A second turbidity sensor is installed in the treatment zone to monitor the turbidity changes of the liquid in real time, providing a basis for judging the degree of contamination and filtration effect of the treated liquid. This multi-stage filtration and online monitoring design helps maintain the cleanliness of the circulating liquid.

[0019] Optionally, the end of the return line away from the filter is divided into two paths, which are respectively connected to two opposite side walls of the distribution area.

[0020] By adopting the above technical solution, the end of the return pipeline is divided into two paths and connected to two opposite sidewalls of the distribution zone, allowing the filtered liquid to be symmetrically injected from both sides of the distribution zone, forming a pressure distribution with the center as the axis of symmetry within the distribution zone. This symmetrical pressure distribution is complemented by the design of the guide orifice diameter gradually decreasing from the center region to the edge region. The smaller guide orifice diameter in the edge region increases the flow resistance in the edge region, while the larger guide orifice diameter in the center region reduces the flow resistance in the center region, thereby compensating for the pressure difference between the edge and the center within the distribution zone. This makes the flow rate of the liquid through the guide plate tend to be uniform, which is beneficial for forming a uniform upward flow field within the treatment zone.

[0021] Optionally, a controller is also included. The detection module includes multiple temperature sensors and multiple concentration sensors. The multiple temperature sensors are distributed along the height direction of the process tank, and the multiple concentration sensors are respectively disposed on two opposite side walls of the process tank. The controller is communicatively connected to the temperature sensors and the concentration sensors respectively.

[0022] By adopting the above technical solution, multiple temperature sensors are distributed along the height direction, which can comprehensively reflect the liquid temperature distribution at different depths within the processing zone; multiple concentration sensors are respectively set on two opposite side walls of the process tank, which can detect the liquid concentration differences at different horizontal positions within the processing zone. The controller communicates with each sensor, enabling it to acquire multi-dimensional temperature and concentration data within the processing zone in real time, providing reliable data support for achieving precise process parameter control.

[0023] Optionally, the controller is communicatively connected to the circulating filtration module. The controller is used to control the operation of the circulating filtration module when the workpiece basket is immersed in the process tank, and to control the circulating filtration module to pause operation after the workpiece basket is removed from the process tank, so that the sediment in the processing area can pass through the guide hole and settle into the distribution area under its own gravity and slide into the collection tank along the inclined bottom plate.

[0024] By adopting the above technical solution, the controller switches the circulating filtration module between two operating modes based on the immersion and removal status of the workpiece basket. When the workpiece basket is immersed in the process tank, the circulating filtration module operates, and liquid flows upward into the processing area through the guide holes, forming a uniform upward flow field to ensure the uniformity of workpiece processing. At this time, the upward liquid flow in the guide holes prevents sediment from passing downward through them. During the interval after the workpiece basket is removed from the process tank, the circulating filtration module reduces its power or stops operating. The upward liquid flow in the guide holes weakens or disappears, and the sediment generated by the chemical reaction in the processing area settles into the distribution area under its own gravity. The guide plate acts as a uniform liquid distribution structure when the circulating filtration module is running, and as a sedimentation channel for sediment when the circulating filtration module is paused, realizing the time-sharing reuse of the guide plate's function. Compared with a separate drain channel inside the tank, this design utilizes the guide holes of the guide plate itself as the sedimentation path for sediment, simplifying the internal structure of the tank.

[0025] Optionally, the handling module includes a traveling unit, a lifting unit, a weighing unit, and a hook. The traveling unit can move along the arrangement direction of the multiple process troughs. The lifting unit is disposed on the traveling unit. The weighing unit is connected to the lifting unit and located above the process trough. The hook is disposed on the weighing unit and is used to connect the workpiece hanging basket.

[0026] By adopting the above technical solution, the overhead crane unit moves along the arrangement direction of the process tanks, realizing the horizontal transfer of the workpiece basket between different process tanks; the lifting unit realizes the lifting and lowering operations of the workpiece basket; the weighing unit can monitor the weight change of the workpiece basket in real time, which can be used to determine whether the workpiece is fully loaded and whether there are any abnormalities such as workpiece falling off during the processing, realizing online monitoring of production materials. The hook is used to reliably connect with the workpiece basket to ensure the safety of the handling process.

[0027] Optionally, the hook is provided with a nozzle, which faces the workpiece basket connected to the hook, and the nozzle is used to spray air onto the workpiece in the workpiece basket.

[0028] By adopting the above technical solution, the nozzle is set on the hook and faces the workpiece basket. When the workpiece is lifted from a process tank, the nozzle can spray compressed air onto the workpiece surface to quickly blow away the residual treatment liquid. This not only reduces the amount of liquid carried by the workpiece during transfer between different process tanks and reduces cross-contamination of treatment liquids in subsequent processes, but also prevents defects such as oxidation or watermarks from occurring on the workpiece when it is exposed to air due to residual liquid on its surface.

[0029] Secondly, this application provides a control method for an electroplating pretreatment system, which adopts the following technical solution:

[0030] A control method for an electroplating pretreatment system, applied to the aforementioned electroplating pretreatment system, includes the following steps:

[0031] Data acquisition steps: Before and / or during the soaking process, the temperature and concentration data in the processing area are collected by the detection module.

[0032] Immersion control step: Based on the temperature data and / or the concentration data, control the immersion time of the workpiece basket in the process tank;

[0033] Flow field control steps: During the soaking process, the circulating filtration module is controlled to operate, extracting the liquid in the treatment zone and filtering it before sending it into the distribution zone, so that the liquid flows upward from the distribution zone through the guide holes of the guide plate into the treatment zone, thereby forming a uniform upward flow field in the treatment zone.

[0034] In summary, this application includes at least one of the following beneficial technical effects:

[0035] 1. By setting up a flow guide plate in the process tank and cooperating with a circulating filter module, a uniform flow field from bottom to top is constructed in the treatment area, which effectively eliminates the stratification of liquid temperature and concentration and local dead zones in the tank, and significantly improves the uniformity and consistency of the electroplating pretreatment effect.

[0036] 2. By setting up multiple temperature and concentration sensors at multiple points and at multiple levels in the treatment area, comprehensive and real-time monitoring of the process parameters of the treatment liquid was achieved, providing a reliable data foundation for the precise control of process parameters and improving the controllability and traceability of the pretreatment process;

[0037] 3. By integrating multiple auxiliary functions such as automated sewage discharge, online monitoring of circulating fluid quality, workpiece weighing monitoring, and air blowing after tank discharge, a high degree of automation and intelligent control of the pretreatment process is achieved, reducing manual intervention and improving production efficiency and product quality. Attached Figure Description

[0038] Figure 1 This is a top view of an electroplating pretreatment system according to Embodiment 1 of this application.

[0039] Figure 2 This is a schematic diagram of the workpiece hanging basket in Embodiment 1 of this application.

[0040] Figure 3 This is a partial structural diagram of the transport module in Embodiment 1 of this application.

[0041] Figure 4 This is a schematic diagram of the process tank and the circulating filter module in Embodiment 2 of this application.

[0042] Figure 5 This is a side view of the process tank in Embodiment 2 of this application.

[0043] Figure 6 It is along Figure 5 A partial structural cross-sectional view of line AA in the middle.

[0044] Figure 7 This is a partial structural diagram of the transport module in Embodiment 2 of this application.

[0045] Figure 8 This is a process flow diagram of a control method for an electroplating pretreatment system according to an embodiment of this application.

[0046] Explanation of reference numerals in the attached figures:

[0047] 1. Process tank; 11. Guide plate; 111. Guide hole; 12. Processing area; 13. Distribution area; 14. Inclined bottom plate; 15. Collection tank; 16. Drain valve; 17. First turbidity sensor; 18. Second turbidity sensor; 2. Workpiece hanging basket; 3. Handling module; 31. Crane unit; 32. Lifting unit; 33. Weighing unit; 34. Hook; 35. Nozzle; 4. Circulation filtration module; 41. Liquid outlet pipeline; 42. Circulation pump; 43. Filter; 44. Liquid return pipeline; 45. Filter screen; 46. Differential pressure sensor; 5. Detection module; 51. Temperature sensor; 52. Concentration sensor. Detailed Implementation

[0048] The following is in conjunction with the appendix Figure 1-8 This application will be described in further detail.

[0049] This application discloses an electroplating pretreatment system.

[0050] It should be noted that, in the description of this invention, the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0051] Example 1: Refer to Figure 1 and Figure 2 An electroplating pretreatment system includes multiple process tanks 1 arranged sequentially along the workpiece processing direction, a transport module 3 for transporting workpiece baskets 2 between each process tank 1, and a controller (not shown in the figure) that is communicatively connected to each process tank 1 and the transport module 3.

[0052] The process tank 1 is a rectangular tank structure with an open top. Multiple process tanks 1 are sequentially divided according to the process flow into: a pre-degreasing tank, a water washing tank, a three-stage degreasing tank, a water washing tank, an alkaline etching tank, a four-stage water washing tank, a two-stage descaling tank, a four-stage water washing tank, a micro-etching tank, a four-stage water washing tank, a first zinc immersion tank, a four-stage water washing tank, a micro-etching tank, a four-stage water washing tank, a second zinc immersion tank, and a sixth water washing tank. Among these, the pre-degreasing tank, degreasing tank, alkaline etching tank, descaling tank, micro-etching tank, first zinc immersion tank, and second zinc immersion tank are reaction tanks, and each water washing tank is a cleaning tank. The entire pretreatment process includes 39 workstations.

[0053] It should be noted that for each of the process tanks 1 (degreasing tank, alkaline etching tank, descaling tank, micro-etching tank, first zinc immersion tank, and second zinc immersion tank) where concentration control is required, a replenishment device is provided. The replenishment device includes a replenishment tank and a replenishment pump. The replenishment tank stores the concentrated treatment solution for the corresponding process, and the outlet of the replenishment pump is connected to the corresponding process tank 1 via a replenishment pipeline. When the controller receives concentration data below the lower limit set by the process, the controller controls the corresponding replenishment pump to start, pumping the concentrated treatment solution from the replenishment tank into the process tank 1 until the concentration data returns to the process set range, at which point replenishment stops.

[0054] In terms of heating control, the controller compares the temperature data with the process set temperature and adjusts the heating power using a PID control algorithm. For the pre-degreasing tank and degreasing tank heated by electric heating elements, the controller controls the temperature by adjusting the power of the electric heating elements. For the alkaline etching tank heated by steam, the controller controls the steam flow by adjusting the opening of the electric regulating valve on the steam coil, thereby adjusting the heating power. When the temperature data is higher than the upper limit set by the process, the controller reduces the heating power or shuts off the heating; when the temperature data is lower than the lower limit set by the process, the controller increases the heating power.

[0055] Reference Figure 1 and Figure 3 There are two transport modules 3, one responsible for transporting workpieces from stations 1-20 and the other for stations 18-39. There is an overlap area between the two transport modules 3 in the station 18-20 area. The transport module 3 includes a crane unit 31, a lifting unit 32, a weighing unit 33, and a hook 34.

[0056] In this embodiment, the traveling unit 31 is a truss-type traveling mechanism arranged along the arrangement direction of the process tank 1, driven by a servo motor, and achieves horizontal movement through a gear and rack mechanism. The lifting unit 32 is mounted on the traveling unit 31 and is a hydraulic cylinder. In other embodiments, the lifting unit 32 may also be configured as an electric hoist or a screw lifting mechanism, etc.

[0057] The weighing unit 33 is connected to the lifting unit 32 and located above the process tank 1, and the weighing unit 33 is communicatively connected to the controller. In this embodiment, the weighing unit 33 is a weighing sensor used to monitor the weight of the object connected to it in real time.

[0058] Reference Figure 2 and Figure 3 The hook 34 is connected to the weighing unit 33 and is used to connect the workpiece basket 2 so that the weighing unit 33 can measure the total weight of the workpiece basket 2 and the workpiece in real time. This makes it easier to confirm whether the number of workpieces in the workpiece basket 2 is correct after loading, monitor whether the workpieces fall during the soaking process in each process, and confirm whether all the workpieces have been taken out when unloading.

[0059] Reference Figure 1 and Figure 3 The motion control logic of the handling module 3 is as follows: The controller determines the number of the next process tank 1 that the workpiece basket 2 needs to go to based on the current process formula; it queries the status of the process tank 1. If the parameters of the process tank 1 are all within the qualified range, it proceeds to the next step. If the parameters are not qualified, it waits for the parameters to be adjusted to be qualified before proceeding to the next step. If the waiting timeout occurs, an alarm is triggered and the fault handling process is initiated; the crane unit 31 is controlled to move directly above the process tank 1; after confirming that the crane unit 31 is in position, the lifting unit 32 is controlled to descend and lift the workpiece basket 2 (refer to...) Figure 2 Immersion tank 1; after lifting unit 32 descends to the designated position, immersion timer is activated; after immersion timer reaches the time set by the process formula, lifting unit 32 is controlled to rise and hang workpiece in basket 2 (refer to...). Figure 2 The lifting unit 32 rises to the position and stays above the process tank 1 (drip time) before moving to the next process tank 1.

[0060] The implementation principle of the electroplating pretreatment system in this application embodiment is as follows: Taking a standard plating process as an example, the equipment is first inspected to ensure that each piece of equipment is working properly. Then, a specified number of cylinders are placed into the workpiece hanging basket 2. The crane unit 31 and the lifting unit 32 operate to connect the hook 34 to the workpiece hanging basket 2 and lift the workpiece hanging basket 2. At this time, the weighing unit 33 automatically weighs the workpiece and compares it with the theoretical weight to ensure that the loading is correct and the loading is completed.

[0061] The processing procedure of the workpiece hanging basket 2 in each process tank 1 is as follows:

[0062] The traveling unit 31 moves the workpiece basket 2 along the guide rail to directly above the target process tank 1. The lifting unit 32 lowers the workpiece basket 2, immersing it in the treatment liquid within the process tank 1. During immersion, the circulation filtration module 4 operates, and liquid flows upward from the distribution area 13 through the guide holes 111 into the treatment area 12, forming a uniform upward flow field. The detection module 5 collects temperature and concentration data in the treatment area 12 in real time. After the immersion reaches the set time, the lifting unit 32 raises the workpiece basket 2, removing it from the process tank 1. The workpiece basket 2 remains above the process tank 1 for a preset time to drip liquid, causing the treatment liquid adhering to the workpiece surface to drip back into the process tank 1, reducing the amount of treatment liquid carried into the next process tank 1. After dripping, the traveling unit 31 moves the workpiece basket 2 directly above the next process tank 1, repeating the immersion, soaking, removal, and dripping process.

[0063] The processes that the workpiece hanging basket 2 passes through in sequence and the corresponding number of process tanks are as follows:

[0064] One pre-wetting water rinse tank is used to wet the surface of the workpiece to facilitate the penetration of the subsequent degreasing solution;

[0065] The degreasing tank consists of three tanks, which sequentially perform coarse degreasing, medium degreasing, and fine degreasing to remove oil stains from the surface of the workpiece step by step.

[0066] Wash one tank with water to remove residual degreasing solution from the surface of the workpiece;

[0067] Alkali etching is performed in one tank to treat the surface of the workpiece with alkaline etching.

[0068] Four water tanks are used to wash the workpiece surface in stages to remove residual alkaline solution.

[0069] Two descaling tanks are used to remove the ash and oxide scale that form on the surface of workpieces after alkaline etching.

[0070] Four tanks are used for water washing to remove residual descaling solution from the workpiece surface in stages.

[0071] The first micro-etching involves one groove to perform micro-roughening treatment on the workpiece surface;

[0072] Four water tanks are used to wash the workpiece surface in stages to remove residual micro-etching solution.

[0073] The first zinc immersion is performed in one tank, forming the first zinc replacement layer on the surface of the workpiece;

[0074] Four water tanks are used to wash the workpiece surface in stages to remove residual zinc immersion solution.

[0075] The second micro-etching involves one tank to remove the first zinc replacement layer and further roughen the workpiece surface microscopically.

[0076] Four water tanks are used to wash the workpiece surface in stages to remove residual micro-etching solution.

[0077] The second zinc immersion is performed in one tank, forming a second zinc replacement layer on the surface of the workpiece. The second zinc replacement layer is denser and more uniform than the first layer.

[0078] The workpiece surface is cleaned in six water tanks through multiple stages to reduce the concentration of residual chemicals on the workpiece surface to below the process requirements.

[0079] After all processes are completed, the crane unit 31 moves the workpiece basket 2 to the unloading station to complete the unloading.

[0080] Example 2: Refer to Figure 4-7 The difference between this embodiment and embodiment 1 is that it also includes a circulating filtration module 4 and a detection module 5, and further improves the internal structure of the process tank 1 and the handling module 3.

[0081] Reference Figure 5 and Figure 6 A guide plate 11 is horizontally arranged inside the process tank 1. The guide plate 11 divides the internal space of the process tank 1 into a processing area 12 located above the guide plate 11 and a distribution area 13 located below the guide plate 11.

[0082] Reference Figure 6 and Figure 7 The guide plate 11 has multiple guide holes 111, which penetrate the upper and lower surfaces of the guide plate 11, allowing the treatment zone 12 and the distribution zone 13 to communicate with each other through the guide holes 111. The treatment zone 12 is the area where the workpiece is immersed in water, and the workpiece hanging basket 2 (refer to...) Figure 2 Under the drive of the transport module 3, it is immersed in the treatment liquid in the treatment zone 12.

[0083] Reference Figure 4 and Figure 6 The distribution area 13 is located below the guide plate 11 and is used to receive the filtered clean liquid fed in by the circulating filter module 4, and to distribute the liquid evenly to the processing area 12 above through the guide hole 111.

[0084] In this embodiment, the guide plate 11 is made of corrosion-resistant material, such as polypropylene (PP), polyvinyl chloride (PVC), or stainless steel, to adapt to the chemical environment of different treatment liquids. The guide plate 11 is fixedly installed on the inner wall of the process tank 1 by a support structure. The support structure can be a support angle steel or a support boss welded to the inner wall of the process tank 1. The guide plate 11 rests on the support structure and is fixed by bolts or clips.

[0085] Multiple guide holes 111 on the guide plate 11 are arranged in an array. In this embodiment, the diameter of the multiple guide holes 111 gradually decreases from the center region to the edge region of the guide plate 11. Since the return liquid pipe 44 injects liquid from the side wall of the distribution zone 13, the liquid diffuses towards the center after entering from the side wall of the distribution zone 13. The liquid pressure in the edge region near the side wall is relatively high, while the liquid pressure in the center region far from the side wall is relatively low. By designing the guide holes 111 in the edge region with a smaller diameter, the flow resistance in the edge region is increased, suppressing the excessive flow rate caused by the higher pressure in the edge region; at the same time, the guide holes 111 in the center region are designed with a larger diameter, reducing the flow resistance in the center region and compensating for the smaller flow rate caused by the lower pressure in the center region. This makes the flow rate of liquid through the guide plate 11 more uniform at all positions, forming a more uniform upward flow field in the processing zone 12.

[0086] In other embodiments, the guide hole 111 may also adopt a uniform aperture design, or other forms of differentiated aperture design may be adopted according to the actual pressure distribution in the distribution area 13.

[0087] The bottom of the process tank 1 is provided with an inclined bottom plate 14. The inclined bottom plate 14 gradually slopes downward from the four edges of the bottom of the process tank 1 towards the center, forming a funnel-shaped structure. A collection tank 15 is provided at the center of the inclined bottom plate 14. The collection tank 15 is a downwardly recessed tank structure used to collect solid particles, precipitates and other impurities generated during the processing. Under the action of gravity, these impurities automatically slide down the inclined surface of the inclined bottom plate 14 into the collection tank 15.

[0088] A drain valve 16 is provided at the bottom of the collection tank 15. In this embodiment, the drain valve 16 is a solenoid valve, used to control the discharge of sediment in the collection tank 15. In other embodiments, the drain valve 16 may also be a pneumatic valve.

[0089] A first turbidity sensor 17 is installed inside the collection tank 15 to monitor the turbidity value of the liquid in the collection tank 15 in real time. When the turbidity value exceeds a preset threshold, it indicates that a large amount of sediment has accumulated in the collection tank 15. At this time, the controller can control the drain valve 16 to open, discharging the sediment from the process tank 1, thus achieving automated sewage discharge. After the sewage discharge is completed, the drain valve 16 closes.

[0090] Reference Figure 4 and Figure 6 The number of circulating filtration modules 4 is equal to that of the process tanks 1, and they are set up one-to-one. The circulating filtration module 4 includes an outlet pipe 41, a circulating pump 42, a filter 43, and a return pipe 44. The outlet pipe 41, the circulating pump 42, the filter 43, and the return pipe 44 are connected in series to form a complete liquid circulation path.

[0091] The end of the outlet pipe 41 away from the circulation pump 42 is connected to the upper side wall of the treatment zone 12, and the connection point is below the liquid surface of the treatment liquid. A filter screen 45 is provided at the end of the outlet pipe 41 near the treatment zone 12. In this embodiment, the filter screen 45 is a coarse filter screen, which is used to perform preliminary filtration before the liquid enters the outlet pipe 41, intercepting large particulate impurities, workpiece debris, etc. in the treatment liquid, and preventing these impurities from entering the circulation pump 42 and causing pump wear or blockage.

[0092] A circulation pump 42 is installed between the outlet pipe 41 and the filter 43 to provide power for liquid circulation. The circulation pump 42 draws liquid from the upper part of the treatment zone 12 through the outlet pipe 41, pressurizes it, and sends it into the filter 43.

[0093] Filter 43 is installed between circulating pump 42 and return pipeline 44 for fine filtration of the liquid. In this embodiment, filter 43 is a cartridge filter with an internal PP cotton filter element or activated carbon filter element. The filtration accuracy of the filter element is selected according to the requirements of the treated liquid, typically 1-50 microns. After the liquid passes through filter 43, the tiny particles and impurities are trapped by the filter element, and the clean liquid flows out from the outlet of filter 43.

[0094] The end of the return liquid line 44 away from the filter 43 is connected to the distribution zone 13. The filtered clean liquid enters the distribution zone 13 through the return liquid line 44, diffuses in the distribution zone 13, and then flows evenly upward into the treatment zone 12 through the guide holes 111 on the guide plate 11, thereby forming a uniform flow field from bottom to top in the treatment zone 12.

[0095] In other embodiments, the end of the return line 44 is divided into two paths, which are respectively connected to the two opposite side walls of the distribution area 13.

[0096] A second turbidity sensor 18 is installed in the treatment zone 12. The second turbidity sensor 18 is used to monitor the turbidity value of the liquid in the treatment zone 12 in real time to assess the overall contamination level of the treated liquid and the filtration effect of the circulating filtration module 4.

[0097] The circulating filtration module 4 also includes a differential pressure sensor 46. The differential pressure sensor 46 is connected to both the inlet and outlet of the filter 43, and is used to monitor the pressure difference between the inlet and outlet of the filter 43 in real time. When the filter 43 is operating normally, there is a certain pressure difference between the inlet and outlet, which is related to the filtration resistance of the filter element. As the filter 43 is used for longer periods, the amount of impurities trapped on the filter element gradually increases, increasing the filtration resistance of the filter element and causing the pressure difference of the filter 43 to gradually rise.

[0098] When the differential pressure value detected by the differential pressure sensor 46 exceeds a preset threshold, it indicates that the filter element is nearing saturation and needs to be cleaned or replaced. The controller can send a filter element maintenance reminder signal to the operator based on the data from the differential pressure sensor 46, or automatically switch to the standby filter 43 in a highly automated system.

[0099] The number of detection modules 5 is equal to that of the process tanks 1, and they are set up one-to-one. Each detection module 5 is located in the corresponding processing area 12. The detection module 5 includes multiple temperature sensors 51 and multiple concentration sensors 52.

[0100] Multiple temperature sensors 51 are distributed along the height direction of the process tank 1. In this embodiment, the multiple temperature sensors 51 are divided into three groups: an upper group, a middle group, and a lower group. The three groups of temperature sensors 51 are distributed from top to bottom along the height direction of the process tank 1. The temperature sensors 51 of the upper group are located in the upper region of the processing area 12, the temperature sensors 51 of the middle group are located in the middle region of the processing area 12, and the temperature sensors 51 of the lower group are located in the lower region of the processing area 12, that is, above the guide plate 11.

[0101] Each group of temperature sensors 51 includes at least two temperature sensors 51, and multiple temperature sensors 51 in the same group are respectively arranged on two opposite side walls of the process tank 1, so that each group of temperature sensors 51 can not only detect the liquid temperature at that height, but also determine the uniformity of the liquid temperature in the horizontal direction by comparing the temperature data at the two side walls at the same height.

[0102] In this embodiment, the installation height of the temperature sensor 51 in the middle layer group is relative to the workpiece hanging basket 2 (refer to...). Figure 2 The center height of the workpiece is roughly corresponding to the liquid temperature in the core area where the workpiece is located, so as to more accurately reflect the liquid temperature in the core area where the workpiece is located.

[0103] Multiple concentration sensors 52 are respectively disposed on two opposite side walls of the process tank 1. In this embodiment, two concentration sensors 52 are disposed, respectively installed on the left and right side walls of the process tank 1, and the installation height is the same as or similar to the installation height of the temperature sensor 51 in the middle layer group.

[0104] Concentration sensor 52 is used to detect the concentration of effective components in the treatment solution within the treatment zone 12 in real time. The type of concentration sensor 52 is selected according to the type of treatment solution; for example, an acidity sensor or conductivity sensor can be used for pickling solutions, and an alkalinity sensor can be used for degreasing solutions.

[0105] Multiple temperature sensors 51 and multiple concentration sensors 52 are respectively connected to the controller for communication. The communication connection can be wired (such as RS485 bus, 4-20mA analog signal, etc.) or wireless (such as WiFi, ZigBee, etc.). The controller receives the detection data from each temperature sensor 51 and concentration sensor 52 in real time and controls each actuator of the system according to the preset control strategy.

[0106] In this embodiment, the controller is a programmable logic controller (PLC) or an industrial computer. The controller is also communicatively connected to the circulating pump 42, the drain valve 16, the first turbidity sensor 17, the second turbidity sensor 18, and the differential pressure sensor 46, etc., to realize centralized control and management of the entire electroplating pretreatment system.

[0107] In this embodiment, the controller uses the weighted average of the three sets of temperature sensors 51 as the feedback signal for temperature control. The weighting coefficient of the middle group of temperature sensors 51 is greater than that of the upper and lower group temperature sensors 51. For example, the weighting coefficient of the upper group is 0.2, the weighting coefficient of the middle group is 0.6, and the weighting coefficient of the lower group is 0.2. This weighted averaging method makes the temperature control more focused on the actual temperature of the core area of ​​the workpiece, improving the accuracy and specificity of temperature control.

[0108] Reference Figure 2 and Figure 7 A nozzle 35 is provided on the hook 34. The nozzle 35 is oriented towards the workpiece basket 2 connected to the hook 34, that is, the spray direction of the nozzle 35 is directed towards the area where the workpiece is located in the workpiece basket 2. The nozzle 35 is used to spray air onto the workpiece in the workpiece basket 2.

[0109] In this embodiment, the nozzle 35 is connected to a compressed air source via an air pipe, which is arranged along the structure of the lifting unit 32 and the hook 34. When the workpiece basket 2 is lifted from a process tank 1 (refer to...) Figure 4 After the process is proposed in the document, the controller controls the compressed air source to turn on, and the compressed air is delivered to the nozzle 35 through the air pipe. The nozzle 35 sprays the compressed air onto the surface of the workpiece to quickly blow away the residual treatment liquid on the surface of the workpiece.

[0110] Multiple nozzles 35 are provided, distributed around the workpiece basket 2 to ensure that the surface of the workpiece within the basket 2 can be swept from multiple directions, thereby improving the sweeping effect. The nozzles 35 can be flat nozzles to generate a fan-shaped airflow and increase the sweeping coverage area.

[0111] The implementation principle of Example 2 is as follows: After the transport module 3 transports the workpiece basket 2 to the top of the process tank 1, the controller reads the current data of the temperature sensor 51 and concentration sensor 52 in the processing area 12, calculates the temperature uniformity index and concentration uniformity index, and allows the workpiece basket 2 to be immersed after all indicators are qualified. For short-time processes with a standard immersion time of less than 30 seconds, the controller pre-calculates the adaptive immersion time based on the current data of the middle layer temperature sensor 51 and concentration sensor 52 before the workpiece basket 2 is immersed and issues it as a fixed value, which is not modified during the immersion process. For long-time processes with a standard immersion time of more than 30 seconds, the controller continuously reads the data of the middle layer temperature sensor 51 and concentration sensor 52 during the immersion process, calculates the remaining required immersion time in real time, and dynamically adjusts the timing of removal.

[0112] After the lifting unit 32 slowly lowers the workpiece basket 2 into the process tank 1, the circulation filtration module 4 continues to operate. The circulation pump 42 draws out the liquid in the upper part of the processing zone 12 through the outlet pipe 41. After the liquid is filtered by the filter 43 to remove suspended impurities, the cleaning liquid is simultaneously injected into the distribution zone 13 from two return ports through the return pipe 44. After the cleaning liquid is evenly diffused in the distribution zone 13, it flows evenly upward into the processing zone 12 through the guide holes 111 on the guide plate 11, forming a uniform upward flow field in the processing zone 12.

[0113] During the processing interval between two adjacent workpiece baskets 2, the controller controls the circulating pump 42 to reduce its operating power or stop operating. At this time, the upward liquid flow velocity at the guide hole 111 decreases or disappears. The precipitate in the processing zone 12 passes through the guide hole 111 and settles into the distribution zone 13 under its own gravity, and slides along the inclined surface of the inclined bottom plate 14 to the collection tank 15 at the center for collection. In addition, for precipitate particles with higher density, even during normal operation of the circulating pump 42, when the gravity of the particles is greater than the drag force generated by the upward liquid flow, the precipitate particles can still pass through the guide hole 111 and settle into the distribution zone 13.

[0114] Meanwhile, the controller dynamically adjusts the operating flow rate of the circulation pump 42 based on the data from the second turbidity sensor 18. When the turbidity is low, it operates at the basic flow rate, and when the turbidity increases, the flow rate is increased to enhance filtration and circulation.

[0115] During the immersion process in the workpiece hanging basket 2, the controller continuously monitors the data from the temperature sensor 51 and concentration sensor 52 within the processing zone 12. When the weighted average temperature fed back by the temperature sensor 51 is lower than the lower limit of the process set temperature, the controller increases the heating power of the corresponding process tank 1: for process tank 1 heated by electric heating tubes, the controller increases the power supplied to the electric heating tubes; for process tank 1 heated by steam, the controller increases the opening of the electric regulating valve on the steam coil to increase the steam flow. When the weighted average temperature returns to the process set range, the controller adjusts the heating power back to the normal level. When the weighted average temperature fed back by the temperature sensor 51 is higher than the upper limit of the process set temperature, the controller reduces the heating power or shuts off heating.

[0116] When the concentration data fed back by concentration sensor 52 is lower than the lower limit of the process set concentration, the controller controls the start of the replenishment pump in the corresponding process tank 1 to pump the concentrated treatment solution in the replenishment tank into process tank 1 through the replenishment pipeline. During the replenishment process, the controller continuously monitors the data from concentration sensor 52. When the concentration data returns to the process set range, the controller controls the replenishment pump to stop running. If the concentration data remains below the lower limit and the replenishment volume has reached the preset upper limit for a single replenishment, the controller stops replenishment and issues an alarm signal, prompting the operator to check the status of the treatment solution.

[0117] After the soaking time is reached, the lifting unit 32 lifts the workpiece basket 2 from the process tank 1 to the set height. The nozzle 35 on the hook 34 sprays compressed air onto the workpiece surface to blow away any residual solution on the workpiece surface and in the cavity. After the air spraying is completed, the transport module 3 transports the workpiece basket 2 to the next process tank 1, and repeats the above process until the workpiece has completed all the pretreatment processes in sequence.

[0118] This application also discloses a control method for an electroplating pretreatment system.

[0119] Reference Figure 6 and Figure 8 A control method for an electroplating pretreatment system includes the following steps:

[0120] Data acquisition: In workpiece hanging basket 2 (refer to...) Figure 2 Before immersion in the process tank 1 and / or during the soaking process, temperature and concentration data in the treatment zone 12 are collected by the detection module 5.

[0121] Specifically, before the workpiece basket 2 is immersed in the process tank 1, the controller first collects the current temperature and concentration data in the processing zone 12 through multiple temperature sensors 51 and multiple concentration sensors 52. The controller performs a weighted average calculation on the collected temperature data to obtain the comprehensive temperature value in the processing zone 12; at the same time, the controller analyzes the collected concentration data to obtain the current concentration value of the processing liquid.

[0122] During the soaking process after the workpiece basket 2 is immersed in the process tank 1, the detection module 5 continuously collects temperature and concentration data in the processing area 12, and the controller updates the comprehensive temperature and concentration values ​​in real time.

[0123] Immersion control steps: Based on temperature data and / or concentration data, control the immersion time of the workpiece hanging basket 2 in the process tank 1.

[0124] Specifically, the controller compares the collected comprehensive temperature and concentration values ​​with standard process parameters based on a preset process parameter table. When both the comprehensive temperature and concentration values ​​are within the standard range, the controller controls the soaking process of the workpiece basket 2 according to the standard soaking time. When the comprehensive temperature value is lower than the standard value, it indicates that the treatment solution temperature is too low and the chemical reaction rate is reduced. The controller appropriately extends the soaking time to compensate for the impact of the low temperature. When the concentration value is lower than the standard value, it indicates that the concentration of effective components in the treatment solution is insufficient. The controller also appropriately extends the soaking time and can simultaneously issue a replenishment reminder signal.

[0125] After the soaking time is reached, the controller controls the transport module 3 to lift the workpiece basket 2 from the current process tank 1 and transfer it to the next process tank 1.

[0126] Flow field control: During the soaking process, the circulating filter module 4 is activated, so that the liquid flows from the treatment zone 12 to the distribution zone 13 and flows upward from the distribution zone 13 through the guide hole 111 of the guide plate 11, so as to form a uniform upward flow field in the treatment zone 12.

[0127] Specifically, after the workpiece basket 2 is immersed in the process tank 1, the controller starts the circulation pump 42. The circulation pump 42 draws out the liquid from the upper part of the processing zone 12 through the liquid outlet pipe 41. The liquid first undergoes preliminary filtration through the filter screen 45 at the inlet of the liquid outlet pipe 41, and then is pressurized by the circulation pump 42 and sent to the filter 43 for fine filtration. The filtered clean liquid enters the distribution zone 13 through the liquid return pipe 44. Under pressure, the liquid in the distribution zone 13 flows upward evenly into the processing zone 12 through multiple guide holes 111 on the guide plate 11, forming a uniform flow field from bottom to top in the processing zone 12.

[0128] During the soaking process, the controller adjusts the operating power of the circulation pump 42 based on the detection data from the second turbidity sensor 18 to control the circulation flow rate. When the turbidity of the liquid in the treatment zone 12 is high, the controller increases the operating power of the circulation pump 42 to accelerate the liquid circulation and filtration speed, thereby reducing the turbidity of the liquid as quickly as possible. When the turbidity returns to the normal range, the controller adjusts the operating power of the circulation pump 42 back to the normal level.

[0129] Meanwhile, the controller monitors the operating status of the filter 43 based on the detection data from the differential pressure sensor 46. When the differential pressure exceeds a preset threshold, the controller issues a filter element maintenance reminder signal.

[0130] During the process of lifting the workpiece basket 2 from the process tank 1, the controller controls the nozzle 35 to spray compressed air onto the workpiece surface to blow away any residual treatment liquid. Simultaneously, the weighing unit 33 monitors the weight change of the workpiece basket 2, and the controller uses the weight data to determine if there are any abnormalities such as workpiece detachment.

[0131] In this embodiment, sedimentation and sewage discharge control is also included: after the workpiece basket 2 is removed from the process tank 1, the circulation filtration module 4 is stopped, and the sediment in the treatment area 12 passes through the guide hole 111 and settles into the distribution area 13 under its own gravity. The sediment passes through the large-diameter guide hole 111 in the central area of ​​the guide plate 11 and slides into the collection tank 15 along the inclined bottom plate 14. Before the next workpiece basket 2 is immersed in the process tank 1, the circulation filtration module 4 is restarted.

[0132] The processing interval between two adjacent workpiece baskets 2 is used as a settling window for sediment. During this window, the circulation filter module 4 is paused. Sediment preferentially passes through the larger-diameter guide holes 111 in the central area of ​​the guide plate 11 and settles into the distribution zone 13, concentrating near the collection tank 15. After sliding down the inclined bottom plate 14 into the collection tank 15, it is discharged through the drain valve 16. The circulation filter module 4 resumes operation before the next workpiece basket 2 is immersed, and an upward liquid flow is re-formed in the guide holes 111, preventing residual fine particles in the distribution zone 13 from being carried back to the processing zone 12. This control method switches the guide plate 11 between processing mode and settling mode in a time-sharing manner, achieving periodic removal of sediment in the processing zone 12 without affecting the workpiece processing cycle. At the same time, the gradual change in the diameter of the guide holes 111 guides the sediment to concentrate in the central area during settling mode, improving the sediment collection efficiency.

[0133] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An electroplating pretreatment system, characterized in that, include: Multiple process tanks (1) are provided, and the multiple process tanks (1) are arranged sequentially along the workpiece processing direction. A guide plate (11) is provided in the process tank (1), and multiple guide holes (111) are opened on the guide plate (11). The guide plate (11) is used to separate a processing area (12) and a distribution area (13) in the process tank (1). The processing area (12) is located above the distribution area (13). The guide holes (111) are connected to the processing area (12) and the distribution area (13) respectively. The number of circulating filtration modules (4) is equal to that of the process tanks (1) and they correspond one-to-one. One end of the circulating filtration module (4) is connected to the processing area (12), and the other end of the circulating filtration module (4) is connected to the distribution area (13). The circulating filtration module (4) is used to extract the liquid in the processing area (12), filter it, and send it to the distribution area (13). The number of detection modules (5) is equal to that of the process tank (1). One detection module (5) is set in one of the processing areas (12). The detection module (5) is used to detect the liquid temperature and concentration in different areas of the processing area (12). The transport module (3) is disposed above the process tank (1) and is used to transport the workpiece basket (2) between the multiple process tanks (1).

2. The electroplating pretreatment system according to claim 1, characterized in that: The diameter of the plurality of flow guide holes (111) gradually decreases from the center region of the flow guide plate (11) to the edge region.

3. The electroplating pretreatment system according to claim 2, characterized in that: The bottom of the process tank (1) is provided with an inclined bottom plate (14) that slopes towards the center. A collection tank (15) is provided at the center of the inclined bottom plate (14). A drain valve (16) is provided at the bottom of the collection tank (15). A first turbidity sensor (17) is provided in the collection tank (15). The sediment that passes through the guide hole (111) and settles into the distribution area (13) slides into the collection tank (15) along the inclined bottom plate (14).

4. The electroplating pretreatment system according to claim 3, characterized in that: The circulating filtration module (4) includes an outlet pipe (41), a circulating pump (42), a filter (43), and a return pipe (44) connected in sequence. The end of the outlet pipe (41) away from the circulating pump (42) is connected to the top of the processing zone (12). A filter screen (45) is provided at the end of the outlet pipe (41) near the processing zone (12). The end of the return pipe (44) away from the filter (43) is connected to the distribution zone (13). A second turbidity sensor (18) is provided in the processing zone (12).

5. The electroplating pretreatment system according to claim 4, characterized in that: The return line (44) splits into two paths at the end away from the filter (43), and is connected to the opposite side walls of the distribution area (13) respectively.

6. The electroplating pretreatment system according to claim 3, characterized in that: It also includes a controller. The detection module (5) includes multiple temperature sensors (51) and multiple concentration sensors (52). The multiple temperature sensors (51) are distributed along the height direction of the process tank (1). The multiple concentration sensors (52) are respectively set on two opposite side walls of the process tank (1). The controller is communicatively connected to the temperature sensors (51) and the concentration sensors (52).

7. The electroplating pretreatment system according to claim 6, characterized in that: The controller is communicatively connected to the circulating filter module (4). The controller is used to control the operation of the circulating filter module (4) when the workpiece basket (2) is immersed in the process tank (1), and to control the circulating filter module (4) to stop operating after the workpiece basket (2) is lifted out of the process tank (1), so that the sediment in the treatment area (12) passes through the guide hole (111) under its own gravity and settles into the distribution area (13) and slides into the collection tank (15) along the inclined bottom plate (14).

8. The electroplating pretreatment system according to claim 1, characterized in that: The transport module (3) includes a traveling unit (31), a lifting unit (32), a weighing unit (33), and a hook (34). The traveling unit (31) can move along the arrangement direction of the multiple process tanks (1). The lifting unit (32) is mounted on the traveling unit (31). The weighing unit (33) is connected to the lifting unit (32) and located above the process tank (1). The hook (34) is mounted on the weighing unit (33) and is used to connect the workpiece basket (2).

9. The electroplating pretreatment system according to claim 8, characterized in that: The hook (34) is provided with a nozzle (35), which faces the workpiece basket (2) connected to the hook (34) and is used to spray air into the workpiece in the workpiece basket (2).

10. A control method for an electroplating pretreatment system, applied to the electroplating pretreatment system as described in claim 1, characterized in that, Includes the following steps: Data acquisition steps: Before and / or during the soaking process, the temperature and concentration data in the processing area (12) are collected by the detection module (5); Immersion control steps: Based on the temperature data and / or the concentration data, control the immersion time of the workpiece hanging basket (2) in the process tank (1); Flow field control steps: During the soaking process, the circulating filtration module (4) is controlled to operate, and the liquid in the treatment zone (12) is extracted and filtered before being sent to the distribution zone (13), so that the liquid flows upward from the distribution zone (13) through the guide hole (111) of the guide plate (11) into the treatment zone (12) to form a uniform upward flow field in the treatment zone (12).

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