Chromium-free electroplating coarsening system

Abstract

The invention discloses a chromate-free electroplating coarsening system which comprises a coarsening pool, a roughing tank, a roughing tank, a roughing tank and a control system. The hanging tool assembly is used for being arranged in the coarsening cavity and used for loading plastic parts; the temperature control module is connected with the coarsening pool and used for maintaining the temperature of the coarsening liquid in the coarsening cavity within a preset process temperature range; the liquid supplementing adjusting module communicates with the coarsening cavity and is used for supplementing the coarsening liquid raw material to the coarsening cavity and maintaining the chemical concentration of the coarsening liquid raw material; and the control module is in electric signal connection with the hanging tool assembly, the temperature control module and the liquid supplementing adjusting module and is used for controlling the processing duration of the hanging tool assembly loading the plastic part in the roughening cavity and cooperatively regulating and controlling the working state of the temperature control module and the working state of the liquid supplementing adjusting module.

Description

Technical Field

[0001] This application relates to the field of electroplating technology, and more specifically to a chromium-free electroplating roughening system. Background Technology

[0002] Currently, the roughening process in plastic electroplating is crucial for coating adhesion. To replace the heavily polluting chromic acid process, environmentally friendly chromium-free roughening (such as the sulfuric acid-potassium permanganate system) has become the mainstream. However, this process is extremely sensitive to parameters such as temperature, concentration, and time, and existing production systems have significant shortcomings in their control, leading to unstable product quality.

[0003] The existing technology has the following main defects: insufficient temperature control precision, which can easily cause excessive or insufficient roughening of local parts of the workpiece; at the same time, the solution concentration management during the roughening process depends on manual labor, and it is impossible to maintain the stability of the bath solution concentration in real time through timed offline testing and manual replenishment, which can easily cause bubbles in the workpiece coating; the roughening time is prone to being too long or too short, resulting in local pitting on the workpiece and poor overall process stability.

[0004] Therefore, existing coarse production relies heavily on operator experience, and product consistency and yield face bottlenecks. There is an urgent need for a system solution that can achieve precise and collaborative closed-loop control of key parameters. Summary of the Invention

[0005] The purpose of this application is to provide a chromium-free electroplating roughening system to improve the roughening stability of workpieces.

[0006] To achieve the above objectives, the technical solution adopted in this application is as follows: A chromium-free electroplating roughening system is provided, comprising: a roughening tank, which has a roughening cavity inside for containing roughening liquid and chemically etching the surface of plastic parts; a hanger assembly, which is placed inside the roughening cavity for loading plastic parts; a temperature control module, which is connected to the roughening tank to maintain the temperature of the roughening liquid in the roughening cavity within a preset process temperature range; a replenishment and adjustment module, which is connected to the roughening cavity to replenish the roughening liquid raw material to the roughening cavity and maintain its chemical concentration; and a control module, which is electrically connected to the hanger assembly, the temperature control module, and the replenishment and adjustment module respectively, for controlling the processing time of the plastic parts loaded in the roughening cavity by the hanger assembly, and coordinating the working states of the temperature control module and the replenishment and adjustment module.

[0007] As a preferred embodiment, the fluid replenishment and adjustment module further includes a fluid disturbance component, which acts on the roughening chamber to promote the flow of the roughening fluid within the roughening chamber.

[0008] As another preferred embodiment, the temperature control module includes multiple heat exchange tubes, which are evenly spaced and arranged on the side walls of opposite sides of the roughening cavity.

[0009] Further preferably, it also includes an aerosol control module, which is disposed at the edge of the outer wall of the opening of the roughening tank, so as to suppress and collect the aerosol generated during the roughening process.

[0010] Further preferably, the fluid disturbance component includes at least one nozzle disposed on the inner wall of one side of the roughening chamber, and a through hole disposed on the opposite inner wall. The nozzle is used to spray roughening liquid into the roughening chamber, and the through hole is used to allow the roughening liquid to flow out, so as to jointly form a through-flow disturbance in the roughening chamber.

[0011] Preferably, a filter element is provided inside the through hole, and the outer wall of the roughening tank has a guide section that flares outward at the position corresponding to the through hole.

[0012] Preferably, the aerosol control module includes a blower assembly disposed at the top of the roughening tank and an aerosol collection hood connected to the air inlet of the blower assembly; wherein the aerosol collection hood has a guide port facing the roughening chamber, and the central axis of the guide port is inclined relative to the vertical direction to guide the aerosol generated in the roughening chamber to flow towards the blower assembly.

[0013] Preferably, the top edge of the roughening tank is provided with a guide rail, and the direction of the guide rail is consistent with the extension direction of the hanging assembly; the aerosol control module also includes a sliding seat slidably mounted on the guide rail, and the fan assembly is fixedly installed on the sliding seat, so that the fan assembly can move relative to the guide rail.

[0014] Preferably, the hanging assembly includes a main hanging rod and a first support rod and a second support rod respectively connected to both sides of the main hanging rod; the first support rod, the second support rod and the main hanging rod are connected at one end by a first connecting part, and at the other end away from the first connecting part, the first support rod and the second support rod form a second connecting part and a third connecting part; wherein, the first connecting part, the second connecting part and the third connecting part are triangularly distributed at the top edge of the roughening tank, so that the hanging assembly is kept stable relative to the roughening tank by three-point support.

[0015] Preferably, the first connecting part, the second connecting part and the third connecting part are respectively provided with lifting hooks, and the three lifting hooks together constitute a lifting structure for realizing the stable lifting and transportation of the hanging assembly.

[0016] Compared with the prior art, the beneficial effects of this application are as follows: The chromium-free electroplating roughening system described in this application transforms the roughening process, which was originally dependent on worker experience and susceptible to environmental interference, into a highly standardized, digitalized, and predictable precision manufacturing process through systematic closed-loop control and multi-parameter coordination. The control module, as the central hub, achieves linkage of the three key process parameters: time, temperature, and concentration. This fundamentally eliminates batch quality defects caused by the loss of control of a single parameter, such as temperature sensor drift leading to an excessively high actual temperature, or untimely replenishment leading to an excessively low concentration. This improves the stability of the roughening process, thereby bringing significant quality and economic benefits. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of one embodiment of this application.

[0018] Figure 2 This is a schematic diagram of the roughening tank in a chromium-free electroplating roughening system, viewed from above.

[0019] Figure 3 This is a side cross-sectional view of the roughening tank facing the nozzle.

[0020] Figure 4 This is a side cross-sectional view of the roughening pool facing the through hole.

[0021] Figure 5 This is a side cross-sectional view of the roughening tank facing the heat exchange tube.

[0022] Figure 6 This is a structural diagram of the fan assembly, air collection hood, and sliding seat.

[0023] Figure 7 This is a schematic diagram of the wind turbine assembly in its first working position on the guide rail.

[0024] Figure 8 This is a schematic diagram of the wind turbine assembly in its second working position on the guide rail.

[0025] Figure 9 This is a schematic diagram of the wind turbine assembly in its third working position on the guide rail.

[0026] In the diagram: 1. Chromium-free electroplating roughening system; 10. Roughening tank; 11. Roughening chamber; 20. Hanging fixture assembly; 21. Hanging fixture main rod; 22. First support rod; 23. Second support rod; 24. First connecting part; 25. Second connecting part; 26. Third connecting part; 27. Lifting hook; 30. Temperature control module; 31. Heat exchange pipe; 40. Liquid replenishment and adjustment module; 41. Fluid disturbance assembly; 411. Nozzle; 412. Through hole; 4121. Filter element; 4122. Guide section; 50. Aerosol control module; 51. Fan assembly; 52. Gas collection hood; 53. Flow guide; 54. Sliding seat; 60. Guide rail. Detailed Implementation

[0027] The present application will be further described below with reference to specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0028] In the description of this application, it should be noted that the directional terms such as "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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. They should not be construed as limiting the specific protection scope of this application.

[0029] It should be noted that the terms "first," "second," etc., in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0030] The terms “comprising” and “having” in the specification and claims of this application are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product or device.

[0031] In a preferred embodiment, see Figures 1 to 9 This application provides a chromium-free electroplating roughening system 1, comprising: a roughening tank 10, which has a roughening cavity 11 for containing roughening liquid and chemically etching the surface of plastic parts; a hanger assembly 20, which is placed in the roughening cavity 11 for loading plastic parts; a temperature control module 30, which is connected to the roughening tank 10 to maintain the temperature of the roughening liquid in the roughening cavity 11 within a preset process temperature range; a replenishment adjustment module 40, which is connected to the roughening cavity 11 to replenish the roughening liquid raw material to the roughening cavity 11 and maintain its chemical concentration; and a control module, which is electrically connected to the hanger assembly 20, the temperature control module 30 and the replenishment adjustment module 40 respectively, for controlling the processing time of the plastic parts loaded in the roughening cavity 11 by the hanger assembly 20, and coordinating the working state of the temperature control module 30 and the replenishment adjustment module 40.

[0032] The present invention system decomposes the complex roughening process into several precisely controllable functional modules, and organically integrates and coordinates them through a central intelligent unit. The core physical carrier of the system is the roughening pool 10, which has sufficient structural rigidity and thermal stability. The roughening cavity 11 is used to contain the chromium-free roughening liquid with concentrated sulfuric acid and potassium permanganate as the core components. The geometry of the roughening cavity 11, such as the depth and aspect ratio of the cuboid, has been optimized by fluid dynamics simulation, aiming to cooperate with the disturbance module described later to minimize the fluid dead zone.

[0033] To ensure the roughening reaction proceeds under optimal and controlled conditions, the system is equipped with three main functional modules: a temperature control module 30, a liquid replenishment and adjustment module 40, and a control module. The core of the temperature control module 30 is to establish and maintain a uniform and stable thermal environment. Temperature not only directly affects the etching rate but also influences the selectivity of the reaction and the formation of the microstructure. The chromium-free electroplating roughening system 1 in this application uses a high-precision temperature sensor to monitor the liquid temperature at the upper, middle, lower, and different horizontal positions of the roughening chamber 11 in real time and feeds the data back to the control module. The actuator of the temperature control module 30, according to instructions, dynamically heats or cools the roughening liquid through its heat exchange elements to ensure that the temperature fluctuations within the entire roughening chamber 11 are strictly limited within a preset process window, for example, maintaining the temperature stably within the range of 60°C to 70°C, thereby providing a thermodynamic reference platform for the chemical reaction.

[0034] The replenishment and adjustment module 40 is responsible for maintaining the stability of the chemical kinetics of the reaction system. During the roughening process, sulfuric acid and potassium permanganate are continuously consumed, while water is lost due to evaporation and workpiece removal, causing changes in the concentration and volume of the bath solution. This module, through an integrated high-precision metering pump, solution storage tank, and online concentration analyzer, such as a sensor capable of measuring specific ion concentrations, forms a closed-loop concentration management system. Based on the concentration deviation signal fed back by the sensor, the control module directs the metering pump to quantitatively replenish the roughening chamber 11 with pre-prepared concentrated mother liquor or deionized water, achieving fine-tuning of the chemical composition of the bath solution and ensuring that the concentrations of its key components are always maintained near the target values, such as controlling the sulfuric acid concentration at 400±20 ml / L and the potassium permanganate concentration at 60±5 g / L. This dynamic balance maintains a constant reaction driving force, which is the fundamental guarantee to avoid insufficient roughening due to concentration decrease or excessive corrosion due to excessively high local concentrations.

[0035] The control module, which regulates the temperature control module 30 and the liquid replenishment adjustment module 40, is the central hub of the system's intelligence and automation. It typically consists of an industrial programmable logic controller (PLC), a human-machine interface, and a data acquisition and monitoring system. The primary function of the control module is precise time control. It accurately directs the crane or lifting mechanism to control the immersion, lifting, and transfer of the workpieces loaded on the fixture assembly 20 within the roughening chamber 11, ensuring that each batch of workpieces undergoes the same precise roughening treatment duration, for example, 5 to 10 minutes. Furthermore, the control module's function lies in coordinated regulation. That is, the control module does not control temperature, concentration, or time in isolation, but rather, based on an internal process model, it creates linkages between the modules. For example, when the sensor detects a slight drop in local temperature due to a large liquid replenishment, the control module can simultaneously fine-tune the power output of the temperature control module and, within a preset elastic range, appropriately extend the processing time of that batch of workpieces to compensate for the subtle impact of the brief temperature drop on the reaction process. This multi-parameter coordinated optimization capability enables the entire system to cope with minor fluctuations in production and improves the stability of the roughening process.

[0036] It should also be noted that the chromium-free electroplating roughening system 1 in this application is suitable for modern continuous electroplating production lines, that is, a complete, efficient, and high-quality plastic electroplating roughening process, which typically follows the steps of "pre-roughening → water washing → pre-immersion → chromium-free roughening → post-immersion". This system is responsible for the chromium-free roughening step. In the pre-roughening stage, the workpiece undergoes preliminary surface activation and homogenization under relatively mild chemical conditions. After water washing, it enters the pre-immersion tank, where it reaches thermal and chemical equilibrium in a concentrated sulfuric acid environment, preparing it for entry into the main roughening tank. Subsequently, the workpiece is transferred by an automated transfer system to the roughening chamber 11 of this system, where it undergoes deep micro-etching under the aforementioned precise control environment to form an ideal anchor-like structure. After roughening, it is washed again and enters the post-immersion tank, where the residual oxidant is thoroughly neutralized by a reducing solution, terminating the reaction and providing a clean surface for subsequent activation processes. This system ensures that the core etching reaction steps are carried out under optimal and stable conditions, thereby transforming the uniform surface state created by the preceding steps into a uniform and high-quality roughening result, which is the decisive hub for the quality of the entire process.

[0037] Therefore, the chromium-free electroplating roughening system 1 in this application transforms the roughening process, which originally relied on worker experience and was susceptible to environmental interference, into a highly standardized, digitalized, and predictable precision manufacturing process through systematic closed-loop control and multi-parameter coordination. The control module, as the central hub, realizes the linkage of the three key process parameters of time, temperature, and concentration, fundamentally eliminating batch quality defects caused by the loss of control of a single parameter, such as temperature sensor drift leading to an excessively high actual temperature, or untimely replenishment leading to an excessively low concentration. This improves the stability of the roughening process, thereby bringing significant quality and economic benefits.

[0038] As a preferred embodiment, the liquid replenishment and adjustment module 40 further includes a fluid disturbance component 41, which acts on the roughening chamber 11 to promote the flow of the roughening liquid within the roughening chamber 11. This component is not a standalone agitator, but rather integrated with the liquid replenishment process. By actively intervening in the fluid state within the roughening chamber 11, it addresses uneven roughening of the plastic part surface caused by insufficient solution settling or natural convection.

[0039] Therefore, in a specific implementation, see Figures 3 to 4 The fluid disturbance component 41 includes at least one nozzle 411 disposed on one side of the inner wall of the roughening chamber 11, and at least one through hole 412 on the opposite side of the inner wall. A one-way valve is disposed outside the through hole 412 to prevent the roughening liquid from flowing back. The nozzle 411 is configured with a thin tube to ensure that the jet can penetrate a certain distance while maintaining convergence. At the same time, the nozzle 411 can be directly connected to the high-precision metering pump and fresh tank liquid storage tank of the replenishment and adjustment module 40 through a pressure-resistant pipe. It belongs to the external pipeline structure and is not shown in this figure. The through hole 412 is the target outlet of the jet. Its diameter is slightly larger than that of the nozzle 411 to reduce back pressure.

[0040] Specifically, in the replenishment and adjustment module 40, the nozzle 411 sprays out the roughening liquid for two purposes: one is to replenish the concentration of the roughening liquid in the roughening chamber 11, and the other is to work with the through hole 412 to enhance the convection of the roughening liquid in the roughening chamber 11. The roughening chamber 11 in this application has two layers of four nozzles 411 on its sidewall. When the control module triggers a replenishment command based on the concentration signal, the metering pump injects a predetermined volume of high-concentration roughening liquid mother liquor into the roughening chamber 11 at a certain pressure through the two upper nozzles 411. At this time, the upper layer of the inner wall of the roughening chamber 11... The two nozzles 411 perform the function of replenishing the solution. When the roughening process continues, the solution concentration in the roughening chamber 11 is sufficient. At this time, the two nozzles 411 at the bottom can cooperate with the through hole 412 to connect to the two nozzles 411 at the bottom through the external pipeline of the through hole 412 to form a self-circulation structure. Then, by driving the pump, the nozzles 411 spray the roughening liquid that has entered through the through hole 412, realize the convection circulation of the solution in the roughening chamber 11, improve the convection effect of the roughening liquid in the roughening chamber 11, thereby improving the bonding degree of the coating on the plastic parts and avoiding blistering on the surface of the plastic parts.

[0041] Preferred, see Figure 4 and Figure 7A filter element 4121 is installed inside the through hole 412. The filtration accuracy can be selected according to the process requirements. These particles mainly include manganese dioxide precipitate continuously generated during the roughening reaction, trace plastic debris falling off the workpiece, and mechanical impurities that may be introduced from the outside, to avoid clogging of the external pipeline. The outer wall of the roughening tank 10 has a guide section 4122 that expands outward at the position corresponding to the through hole 412. By smoothly expanding the cross-sectional area of ​​the flow channel, the velocity and dynamic pressure of the fluid flow out are reduced, so that the fluid can be smoothly diffused and discharged, realizing the stable discharge of liquid flow and energy recovery. It effectively prevents liquid splashing and eddy generation, making the entire discharge process quiet and orderly. At the same time, the flared structure also provides a convenient operating window for the periodic inspection, cleaning or replacement of the filter element 4121.

[0042] As another preferred option, participate Figure 5 The temperature control module 30 includes multiple heat exchange tubes 31, which are evenly spaced on the side walls of opposite sides of the roughening chamber 11. The heat exchange tubes 31 can be connected in parallel or series, and are tightly fitted or embedded in the jacket walls on both sides of the roughening tank 10 in a serpentine or parallel shape. The spacing between the tubes is determined by thermal simulation calculation to ensure that the heat released or absorbed from any heat exchange tube 31 can fully overlap with the influence range of the adjacent tubes, thereby forming a continuous and uniform temperature radiation surface on the side wall plane.

[0043] Meanwhile, compared with the traditional method of placing the heating tube at the bottom of the pool, the sidewall arrangement avoids direct contact with the impurities settling at the bottom of the pool, preventing the heat exchange efficiency from decreasing and local overheating caused by the covering of impurities. This ensures that the temperature of the roughening liquid in the upper and lower layers of the roughening chamber 11 with a certain depth remains consistent, reducing the uneven roughening phenomenon caused by temperature factors.

[0044] Further preferably, it also includes an aerosol control module 50. The sulfuric acid mist and possible trace aerosols emitted by the chromium-free roughening liquid at high temperatures pose a threat to the production environment and human health. The aerosol control module 50 provided in this application is disposed at the edge of the opening of the roughening tank 10 to suppress and collect the aerosol generated during the roughening process, aiming to capture it at the source and prevent its diffusion.

[0045] Specifically, the aerosol control module 50 includes a blower assembly 51 disposed on the top of the roughening tank 10, and an aerosol collection hood 52 connected to the air inlet of the blower assembly 51; wherein, the aerosol collection hood 52 has a guide port 53 facing the roughening chamber 11, and the central axis of the guide port 53 is inclined relative to the vertical direction to guide the aerosol generated in the roughening chamber 11 to flow to the blower assembly 51.

[0046] The blower assembly 51 provides stable negative pressure suction power; the gas collection hood 52 serves as the collection terminal. The gas collection hood 52, resembling an inverted hood, is suspended at a suitable height above the opening of the coarsening chamber 11, with a guide port 53 at its lower part serving as the channel for the entry of the mist. Furthermore, in the spatial orientation of the guide port 53, its central axis is not perpendicular to the vertical direction of the liquid surface, but rather tilted at an angle relative to the vertical direction, for example, at 30-40 degrees. At this angle, the plane of the guide port 53 forms an acute angle with the liquid surface, creating a partial lateral suction effect. This allows a layer of airflow to be formed above the liquid surface, gently and effectively sweeping the evaporated and diffused mist into the interior of the gas collection hood 52.

[0047] Preferably, a guide rail 60 is mounted on the top edge of the roughening tank 10. The direction of the guide rail 60 is consistent with the extension direction of the hanging assembly 20, ensuring that the presence of the guide rail 60 will not encroach on the hanging of the hanging assembly 20 relative to the edge of the roughening tank 10, thus eliminating the movement interference between the two. The aerosol control module 50 also includes a sliding seat 54 slidably mounted on the guide rail 60. The fan assembly 51 is fixedly mounted on the sliding seat 54, so that the fan assembly 51 can move relative to the guide rail 60.

[0048] On this guide rail 60, the installation method of the fan assembly 51 of the aerosol control module 50 is changed. The fan assembly 51 is no longer fixedly installed in a certain position, but is supported by a sliding seat 54 that is slidably mounted on the guide rail 60; see Figures 7 to 9 The blower assembly 51 is fixed on the sliding seat 54, allowing it to move freely along the length of the roughening tank 10. This enables one blower assembly 51 to flexibly serve different sections of the long roughening tank 10. For example, in this application, the blower assembly 51 can have multiple different working positions, such as... Figure 7 At this time, the fan assembly 51 is located at one end of the guide rail 60, and the fan assembly 51 is running in the first working position. When the roughening enters the intermediate stage, the fan assembly 51 can be adjusted to... Figure 8 As shown, it is operating in the second working position. When coarsening enters the final stage, the fan assembly 51 can be adjusted to... Figure 9 It operates in the third working position shown; furthermore, guide rails 60 can be provided on both sides of the roughening tank 10, and the sliding seat 54 can be disassembled and assembled relative to a single guide rail 60, thereby realizing the suction of aerosols on both sides of the roughening tank 10 according to different working conditions.

[0049] Meanwhile, to ensure the overall layout of the roughening tank 10 is extremely compact and functionally integrated, the bottom of the guide rail 60 is directly connected to and supports the downward-extending heat exchange tube 31. The heat exchange tube 31 extends downward in an orderly manner from the bottom of the guide rail 60 and is eventually connected to the side wall heat exchange jacket of the roughening tank 10 in a predetermined arrangement or directly forms part of the side wall.

[0050] Preferred, Participate Figure 2 The hanging assembly 20 includes a main hanging rod 21 and a first support rod 22 and a second support rod 23 respectively connected to both sides of the main hanging rod 21. The first support rod 22, the second support rod 23 and the main hanging rod 21 are connected at one end by a first connecting part 24. At the other end away from the first connecting part 24, the first support rod 22 and the second support rod 23 form a second connecting part 25 and a third connecting part 26. The first connecting part 24, the second connecting part 25 and the third connecting part 26 are triangularly distributed at the top edge of the roughening tank 10 so that the hanging assembly 20 can be kept suspended stably relative to the roughening tank 10 by three-point support.

[0051] The main rod 21 of the hanger is made of high-strength stainless steel, and its length is adapted to the top width of the roughening tank 10, ensuring that the hanger assembly 20 can be installed above the roughening tank 10. The first support rod 22 and the second support rod 23 are made of the same material as the main rod 21, and their lengths are consistent. By setting the hanger assembly 20 as a combination structure of the main rod 21, the first support rod 22 and the second support rod 23, and with three triangularly distributed connecting parts, a three-point support structure is formed. Compared with the traditional two-point support, the triangular support has extremely strong stability, which can effectively prevent the hanger assembly 20 from shaking, tilting or even falling off during the suspension process. This ensures that the hanger assembly 20 and the suspended workpiece can be stably positioned above the roughening tank 10, ensuring the smooth progress of the roughening process. At the same time, the three-point support makes the force on the hanger assembly 20 more even, which can distribute the weight of the hanger assembly 20 and the workpiece, reduce the stress load on individual connecting parts, prevent damage to the connecting parts due to excessive force, and extend the service life of the hanger assembly 20.

[0052] Preferably, the first connecting part 24, the second connecting part 25 and the third connecting part 26 are respectively provided with lifting hooks 27, and the three lifting hooks 27 together constitute a lifting structure for realizing the smooth lifting and transportation of the hanging assembly 20.

[0053] To achieve automated transport that seamlessly integrates with the aforementioned stable suspension structure, the mounting assembly 20 of this invention features functional extensions at three stress points. Specifically, dedicated lifting hooks 27 are extended from the first connecting portion 24, the second connecting portion 25, and the third connecting portion 26. The spatial positions of these three lifting hooks 27 strictly correspond to the three support points at the bottom. Together, they constitute the lifting structure of the mounting assembly 20, specifically designed for docking with the gripping mechanism of the automated guided vehicle, typically a three-jaw chuck or a beam with three lifting points. This ensures that the entire mounting assembly 20 remains stable during lifting, aerial operation, and descent without tilting, twisting, or swaying.

[0054] Furthermore, in a specific implementation scenario, to condense all the aforementioned technological innovations into a production scenario that can be intuitively understood, a complete embodiment applied to the electroplating production of a high-end automotive ABS interior component is described below. System parameters are set according to the workpiece material and surface area. In the chromium-free primary roughening process, the roughening solution consists of sulfuric acid (concentration 420 ml / L) and potassium permanganate (concentration 65 g / L). The control module sets the core process parameters as follows: temperature 65.0℃ (temperature control module 30 maintains a range of 60-70℃), processing time 420 seconds.

[0055] System collaborative operation process: Loading and transfer: After the pre-roughening, washing, and pre-immersion processes are completed, the workpiece is smoothly picked up by the automatic crane through the three lifting hooks 27 of the hanger assembly 20 and transferred to the top of this roughening system. Immersion and start-up: The crane precisely places the hanger assembly 20 at the edge of the roughening tank 10 with a three-point support method, and then smoothly descends until the workpiece is completely immersed; the control module simultaneously starts a 350-second countdown; Temperature control: The temperature control module 30 immediately starts working, evenly distributed in the heat exchange tubes 31 on both side walls; Concentration management and fluid disturbance: The online concentration meter of the replenishment adjustment module 40 checks every 30 seconds. When the potassium permanganate concentration is detected to be below 63g / L, the control module commands the start-up. The metering pump injects 2 liters of concentrated mother liquor into the side wall through two nozzles 411 on the upper part of the side wall in a pulse within 5 seconds, which can create a flow disturbance. The coarsening liquid can be replenished 1-2 times in one coarsening process. During the continuous coarsening process, the coarsening liquid is continuously output through two nozzles 411 on the lower part of the side wall and flows out through the through hole 412 on the opposite side wall, forming a convection circulation.

[0056] In synchronous mode, the fan of the aerosol control module 50 starts as soon as the workpiece is immersed, and the aerosol evaporating from the liquid surface is steadily drawn away through the gas collection hood 52 of the inclined guide port 53 and sent to the alkaline spray tower for treatment.

[0057] Tank removal and transfer: When the roughening time ends, the crane smoothly lifts the hanger, the workpiece leaves the liquid surface, and after a short drip of the attached liquid, the hanger is transferred to the subsequent water washing and immersion tank.

[0058] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by this application is defined by the appended claims and their equivalents.

Claims

1. A chromium-free electroplating roughening system, characterized in that, include: The roughening tank has a roughening chamber inside for containing the roughening liquid and chemically etching the surface of the plastic part; A mounting bracket assembly, which is placed within the roughening cavity for loading plastic parts; A temperature control module is connected to the roughening tank to maintain the temperature of the roughening liquid in the roughening chamber within a preset process temperature range. A replenishment and adjustment module is connected to the roughening chamber and is used to replenish the roughening liquid raw material to the roughening chamber and maintain its chemical concentration; The control module is electrically connected to the hanger assembly, the temperature control module, and the liquid replenishment adjustment module, respectively. It is used to control the processing time of the plastic parts loaded in the roughening chamber by the hanger assembly, and to coordinate and regulate the working status of the temperature control module and the liquid replenishment adjustment module.

2. The chromium-free electroplating roughening system as described in claim 1, characterized in that, The fluid replenishment and adjustment module also includes a fluid disturbance component, which acts on the roughening chamber to promote the flow of the roughening fluid within the roughening chamber.

3. The chromium-free electroplating roughening system as described in claim 1, characterized in that, The temperature control module includes multiple heat exchange tubes, which are evenly spaced and arranged on the side walls of opposite sides of the roughening cavity.

4. The chromium-free electroplating roughening system as described in claim 1, characterized in that, It also includes an aerosol control module, which is disposed at the edge of the outer wall of the opening of the roughening tank, so as to suppress and collect the aerosol generated during the roughening process.

5. The chromium-free electroplating roughening system as described in claim 2, characterized in that, The fluid disturbance component includes at least one nozzle disposed on one inner wall of the roughening chamber and a through hole disposed on the opposite inner wall. The nozzle is used to spray roughening liquid into the roughening chamber, and the through hole is used to allow the roughening liquid to flow out, so as to jointly form a flow disturbance in the roughening chamber.

6. The chromium-free electroplating roughening system as described in claim 5, characterized in that, A filter element is provided inside the through hole, and the outer wall of the roughening tank has a guide section that expands outward at the position corresponding to the through hole.

7. The chromium-free electroplating roughening system as described in claim 4, characterized in that, The aerosol control module includes a blower assembly installed at the top of the roughening tank, and an air collection hood connected to the air inlet end of the blower assembly. The gas collection hood has a guide port facing the roughening chamber, and the central axis of the guide port is inclined relative to the vertical direction to guide the gas mist generated in the roughening chamber to the fan assembly.

8. The chromium-free electroplating roughening system as described in claim 7, characterized in that, The top edge of the roughening tank is equipped with a guide rail, and the direction of the guide rail is consistent with the extension direction of the hanging assembly. The aerosol control module also includes a sliding seat that is slidably mounted on the guide rail, and the fan assembly is fixedly installed on the sliding seat, thereby allowing the fan assembly to move relative to the guide rail.

9. The chromium-free electroplating roughening system according to any one of claims 1-8, characterized in that, The hanging assembly includes a main hanging rod, and a first support rod and a second support rod respectively connected to both sides of the main hanging rod; The first support rod, the second support rod and the main rod of the hanger are connected at one end by a first connecting part, and at the other end away from the first connecting part, the first support rod and the second support rod form a second connecting part and a third connecting part; The first connecting part, the second connecting part, and the third connecting part are arranged in a triangle at the top edge of the roughening pool so that the hanging assembly is kept stable relative to the roughening pool by three-point support.

10. The chromium-free electroplating roughening system as described in claim 9, characterized in that, The first connecting part, the second connecting part and the third connecting part are respectively provided with lifting hooks, and the three lifting hooks together constitute a lifting structure for realizing the smooth lifting and transportation of the hanging assembly.

Images