A device for automatically controlling pH and chromium content in electrolytic copper foil production section

Abstract

The utility model discloses a device of automatic control pH and chromium content of electrolytic copper foil preparation liquid section, including pH detection unit, chromium content detection unit, control unit, dosing system, stirring device and man -machine interface, pH detection unit, chromium content detection unit Control unit electric connection respectively, the utility model discloses a real -time detection of the electrolyte pH value and chromium content in preparation liquid tank has been realized to pH detection unit and chromium content detection unit, and pH electrode real -time detection pH value and is passed through the transmitter to control unit, and sampling pump continuously draws electrolyte sample to the on -line atomic absorption spectrometer analysis chromium content, and the data obtained also timely transmission gives control unit, and control unit can make the judgement and send the instruction to dosing system according to these real -time accurate data, and control corresponding metering pump and inject the appropriate amount of acid and alkali liquid or chromium regulator, and the pH value and chromium content are stably controlled in the standard range.

Description

Technical Field

[0001] This utility model mainly relates to the field of electrolytic copper foil production technology, specifically a device for automatically controlling pH and chromium content in the electrolytic copper foil solution preparation section. Background Technology

[0002] Electrolytic copper foil production is a crucial step in copper foil manufacturing. It involves depositing copper ions onto a cathode via electrolysis under specific process conditions to form copper foil. This process has a decisive impact on the quality and performance of the copper foil and is fundamental to ensuring its effective application.

[0003] In the production of electrolytic copper foil, the electrolyte plays a crucial role. The electrolyte is a solution containing copper ions and other related components. It provides a medium for ion migration during the electrolysis process, allowing copper ions to move towards the cathode and deposit to form copper foil under the influence of an electric field. The composition and properties of the electrolyte, such as pH value and chromium content, have a direct impact on the quality of the copper foil. However, existing electrolytic copper foil preparation processes have many problems. In terms of pH control, traditional processes rely heavily on manual periodic testing, such as intermittent measurement using test strips or portable instruments, and mainly on manual addition of acid and alkali solutions. This not only fails to achieve real-time pH monitoring, leading to data feedback delays, but also makes it difficult to accurately control the dosage when adding chemicals, resulting in problems of over- or under-addition. In terms of chromium content control, existing methods rely more on offline testing, requiring sampling from the preparation tank to the testing instrument at fixed intervals. From sampling to testing, there is often a certain amount of time. During this period, the chromium content in the electrode solution may deviate from the standard range and cannot be detected and adjusted in time, further exacerbating the instability of the electrolyte performance. At the same time, the intensity of manual operation is also high. More importantly, the pH and chromium content control systems are independent of each other, lacking a unified control unit to integrate, analyze, and adjust the data of both. Utility Model Content

[0004] This utility model addresses the problem of overly simplistic solutions in existing technologies by providing an automatic pH and chromium content control device for the electrolytic copper foil preparation process. This solves the problems mentioned in the background section, where existing electrolytic copper foil preparation processes rely on manual or simple automatic systems for pH control, resulting in insufficient accuracy and performance fluctuations. Furthermore, chromium content control depends on periodic testing and manual adjustment, leading to detection delays and difficulty in real-time regulation.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: An automatic control device for pH and chromium content in an electrolytic copper foil solution preparation section includes a pH detection unit, a chromium content detection unit, a control unit, a dosing system, a stirring device, and a human-machine interface. The pH detection unit, the chromium content detection unit, the dosing system, and the human-machine interface are electrically connected to the control unit. The reagent output end of the dosing system is connected to the solution preparation tank through a pipeline for adding reagents into the solution preparation tank. The stirring device is located inside the solution preparation tank.

[0006] The dosing system includes a pH adjustment subsystem and a chromium adjustment subsystem.

[0007] Furthermore, the pH detection unit includes a pH electrode and a transmitter. The signal output terminal of the pH electrode is electrically connected to the signal input terminal of the transmitter, and the output terminal of the transmitter is electrically connected to the corresponding input terminal of the control unit. The pH extends into the interior of the electrolyte preparation tank to detect the pH value of the electrolyte.

[0008] Furthermore, the chromium content detection unit includes an online atomic absorption spectrometer and a sampling pump. The inlet of the sampling pump is connected to the sampling interface in the middle of the side wall of the liquid preparation tank through a sampling pipe, and is used to extract electrolyte samples in the liquid preparation tank. The outlet of the sampling pump is connected to the sample inlet of the online atomic absorption spectrometer through a delivery pipe, and delivers the sample to the online atomic absorption spectrometer. The online atomic absorption spectrometer is electrically connected to the control unit.

[0009] Furthermore, the pH adjustment subsystem includes an acid storage tank, an alkali storage tank, and a metering pump connected to the outlet of the acid storage tank and the alkali storage tank, respectively. The outlet of the metering pump is connected to the pH dosing interface of the liquid preparation tank through a pipeline.

[0010] Furthermore, the chromium conditioning subsystem includes a chromium conditioning agent storage tank and a metering pump connected to its outlet pipe. The outlet of the metering pump is connected to the chromium dosing interface of the liquid preparation tank. The inner walls of the acid storage tank, alkali storage tank, and chromium conditioning agent storage tank are all provided with an anti-oxidation coating, and each is equipped with a liquid level sensor inside.

[0011] Furthermore, the liquid preparation tank is a vertical, enclosed tank with a detachably connected cover plate at the top. The cover plate has corresponding mounting holes for the stirring device and the pH electrode of the pH detection unit to penetrate. The side wall of the liquid preparation tank has, from top to bottom, a sampling interface connected to the sampling pump inlet of the chromium content detection unit, and a dosing interface connected to the metering pump outlet of the dosing system. The dosing interface includes a pH dosing interface and a chromium dosing interface, as well as a return interface connected to the return pipe of the chromium content detection unit. Each interface is a tubular structure with a flange and is welded and fixed to the tank. The bottom of the liquid preparation tank has a conical structure, with a drain port with a valve at the lowest point.

[0012] Furthermore, the stirring device includes a support and a stirring component. The support is L-shaped, with one end fixed to the top edge of the liquid preparation tank by bolts, and the other end extending horizontally and fixedly connected to the housing at the top of the stirring component. The stirring component includes a magnetic rotor disposed inside the liquid preparation tank.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. Real-time detection of pH and chromium content in the electrolyte in the preparation tank is achieved through pH and chromium content detection units. The pH electrode detects the pH value in real time and transmits it to the control unit via a transmitter. The sampling pump continuously draws electrolyte samples to an online atomic absorption spectrometer for chromium content analysis. The obtained data is also transmitted to the control unit in a timely manner. Based on this real-time and accurate data, the control unit can quickly make judgments and issue precise instructions to the dosing system to control the corresponding metering pumps to inject appropriate amounts of acid or alkali solutions or chromium regulators, so as to stably control the pH value and chromium content within the standard range, effectively solving the problems of insufficient control precision and detection lag in traditional processes.

[0014] 2. The control unit can process two sets of data, pH value and chromium content, respectively. Based on their comparison with the standard value range, it controls the dosing of the pH adjustment subsystem and the chromium adjustment subsystem, changing the previous situation where pH and chromium content control were independent of each other. At the same time, the operator can view the data and device status and adjust the parameters in real time through the human-machine interface, making the entire electrolytic copper foil solution preparation process more efficient and stable.

[0015] The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0016] Figure 1 This is a partial plan view of the present utility model; Figure 2 This is a process flow diagram of the present invention.

[0017] The diagram is labeled as follows: 1. pH detection unit; 2. Chromium content detection unit; 21. Online atomic absorption spectrometer; 22. Sampling pump; 3. Control unit; 4. Dosing system; 41. pH adjustment subsystem; 411. Acid storage tank; 412. Alkali storage tank; 42. Chromium adjustment subsystem; 421. Chromium regulator storage tank; 5. Stirring device; 6. Human-machine interface; 7. Liquid preparation tank. Detailed Implementation

[0018] To facilitate understanding of this utility model, a more comprehensive description of the utility model will be given below with reference to the accompanying drawings, which show several embodiments of the utility model. However, the utility model can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the disclosure of the utility model more thorough and comprehensive.

[0019] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0020] Please refer to the appendix carefully. Figure 1-2 An automatic control device for pH and chromium content in an electrolytic copper foil solution preparation section includes a pH detection unit 1, a chromium content detection unit 2, a control unit 3, a dosing system 4, a stirring device 5, and a human-machine interface 6. The pH detection unit 1, the chromium content detection unit 2, the dosing system 4, and the human-machine interface 6 are electrically connected to the control unit 3. The reagent output end of the dosing system 4 is connected to the solution preparation tank 7 through a pipeline for adding reagents into the solution preparation tank 7. The stirring device 5 is located inside the solution preparation tank 7.

[0021] The dosing system 4 includes a pH adjustment subsystem 41 and a chromium adjustment subsystem 42.

[0022] In this embodiment, as Figure 1 and Figure 2 As shown, the pH detection unit 1 includes a pH electrode and a transmitter. The signal output terminal of the pH electrode is electrically connected to the signal input terminal of the transmitter, and the output terminal of the transmitter is electrically connected to the corresponding input terminal of the control unit 3. The pH extends into the interior of the electrolyte preparation tank 7 to detect the pH value of the electrolyte.

[0023] With the above structure, the pH electrode extends into the liquid preparation tank 7, which can detect the pH value of the electrolyte in real time and promptly reflect the actual situation inside the liquid preparation tank 7, and then transmit it to the control unit 3. In this way, the control unit 3 can make a judgment based on the pH value signal data and send corresponding instructions to the dosing system 4.

[0024] In this embodiment, as Figure 1 and Figure 2As shown, the chromium content detection unit 2 includes an online atomic absorption spectrometer 21 and a sampling pump 22. The inlet of the sampling pump 22 is connected to the sampling interface in the middle of the side wall of the liquid preparation tank 7 through a sampling pipe, and is used to extract electrolyte samples in the liquid preparation tank 7. The outlet of the sampling pump 22 is connected to the sample inlet of the online atomic absorption spectrometer 21 through a delivery pipe, and delivers the sample to the online atomic absorption spectrometer 21. The online atomic absorption spectrometer 21 is electrically connected to the control unit 3.

[0025] With the above structure, the sampling pump 22 is connected to the sampling interface in the middle of the liquid preparation tank 7, which can continuously and stably extract the internal electrolyte sample. When the online atomic absorption spectrometer 21 analyzes the chromium content of the sample, it is based on the absorption characteristics of atoms to light of a specific wavelength. When light of a specific wavelength emitted by the light source passes through the sample vapor containing chromium atoms, the chromium atoms will absorb part of the light. The degree of absorption is proportional to the concentration of chromium atoms in the sample. By measuring the degree of light absorption, the chromium content in the sample can be calculated. This is existing technology and will not be elaborated further. When the chromium content data obtained by the online atomic absorption spectrometer 21 is transmitted to the control unit 3 in a timely manner, the control unit 3 can quickly make a decision on whether to adjust the chromium content based on the real-time and accurate chromium content information.

[0026] In this embodiment, as Figure 1 and Figure 2 As shown, the pH adjustment subsystem 41 includes an acid storage tank 411, an alkali storage tank 412, and a metering pump connected to the outlet of the acid storage tank 411 and the alkali storage tank 412 respectively. The outlet of the metering pump is connected to the pH dosing interface of the liquid preparation tank 7 through a pipeline.

[0027] Through the above structure, the acid storage tank 411, alkali storage tank 412, and chromium regulator storage tank 421 each have their own metering pumps and corresponding reagents. When the control unit 3 determines that the pH value or chromium content value of the electrolyte in the solution preparation tank 7 deviates from the standard range based on the pH value signal fed back by the pH detection unit 1 or the chromium content signal fed back by the chromium content detection unit 2, it can start the corresponding metering pump through the control body 3, and open the pipeline according to the selected metering pump, so that the acid, alkali, or chromium regulator corresponding reagent is injected into the solution preparation tank 7 from the dosing interface, effectively adjusting the pH and chromium content of the electrolyte and ensuring that it is always maintained within a stable standard range.

[0028] In this embodiment, as Figure 1 and Figure 2 As shown, the chromium conditioning subsystem 42 includes a chromium conditioning agent storage tank 421 and a metering pump connected to its outlet pipe. The outlet of the metering pump is connected to the chromium dosing interface of the liquid preparation tank 7. The inner walls of the acid storage tank 411, the alkali storage tank 412 and the chromium conditioning agent storage tank 421 are all provided with an anti-oxidation coating, and each is equipped with a liquid level sensor.

[0029] With the above structure, the liquid level sensor built into each storage tank can detect the liquid level of the reagent in the tank in real time, so that the operator can understand the reagent inventory in time through the human-machine interface 6, arrange the replenishment of reagent in advance, and ensure the continuity and stability of the entire electrolytic copper foil preparation process.

[0030] In this embodiment, as Figure 1 and Figure 2 As shown, the liquid preparation tank 7 is a vertical enclosed tank. The top of the tank is equipped with a cover plate that can be detachably connected to it. The cover plate has corresponding mounting holes for the stirring device 5 and the pH electrode of the pH detection unit 1 to penetrate. The side wall of the liquid preparation tank 7 is provided with a sampling interface connected to the inlet of the sampling pump 22 of the chromium content detection unit 2 and a dosing interface connected to the outlet of the metering pump of the dosing system 4, from top to bottom. The dosing interface includes a pH dosing interface and a chromium dosing interface. Each interface is a tubular structure with a flange and is welded and fixed to the tank body. The bottom of the liquid preparation tank 7 has a conical structure, and a drain port with a valve is provided at the lowest point of the bottom.

[0031] With the above structure, the electrolyte preparation tank 7 is made of 316L stainless steel, which has good corrosion resistance and can effectively resist the erosion of electrolyte, extending the service life of the electrolyte preparation tank 7. The removable cover plate on the top facilitates maintenance and cleaning of the inside of the tank, and can prevent impurities from entering, ensuring the purity of the electrolyte. The corresponding interfaces set in the electrolyte preparation tank 7 ensure the smooth operation of the entire electrolyte preparation process.

[0032] In this embodiment, as Figure 1 and Figure 2 As shown, the stirring device 5 includes a support and a stirring component. The support is L-shaped, with one end fixed to the top edge of the liquid preparation tank 7 by bolts, and the other end extending horizontally and fixedly connected to the top shell of the stirring component. The stirring component includes a magnetic rotor disposed inside the liquid preparation tank 7.

[0033] With the above structure, the stirring device 5 adopts a magnetic stirrer, whose speed can be flexibly adjusted within a wide range of 0-1000 rpm. It can control the stirring intensity according to different stages of drug addition and actual mixing needs. When adding acid or alkali solutions or chromium regulators to the liquid preparation tank 7, the speed can be increased to a suitable range so that the newly added agents can be quickly and fully dispersed into the electrolyte, accelerating the speed at which the pH value and chromium content reach the standard range. When the electrolyte properties are relatively stable, the speed can be reduced to reduce unnecessary energy consumption. At the same time, this non-contact magnetically driven stirring method can more effectively ensure the uniform mixing of the electrolyte in the entire liquid preparation tank 7 compared to traditional stirring structures.

[0034] The specific operating procedure of this utility is as follows: When the device is running, the pH electrode in the pH detection unit 1 is continuously immersed in the electrolyte in the liquid preparation tank 7 to detect the pH value in the electrolyte in real time. The detected signal is transmitted to the transmitter connected to it. After the transmitter converts and processes the signal, it is transmitted to the control unit 3. The control unit will continuously receive the signal and analyze the signal data of the pH value.

[0035] Meanwhile, the sampling pump 22 in the chromium content detection unit 2 continuously draws electrolyte samples from the sampling interface of the liquid preparation tank 7. The drawn samples are then transported via a delivery pipeline to the sample inlet of the online atomic absorption spectrometer 21. The online atomic absorption spectrometer 21 accurately detects and analyzes the chromium content in the sample and transmits the detected chromium content data to the control unit 3.

[0036] After receiving the pH value and chromium content data, the control unit 3 compares them with the standard value range preset on the human-machine interface 6. If the control unit 3 determines that the pH value is lower than the lower limit of the standard value range, it will send a command to the pH adjustment subsystem 41 of the dosing system 4. Upon receiving the command, the metering pump corresponding to the alkali storage tank 412 starts, injecting the alkali solution from the alkali storage tank 412 through the pipeline and into the electrolyte in the liquid preparation tank 7 through the pH dosing interface to increase the pH value. If the pH value is higher than the upper limit of the standard value range, the control unit 3 controls the metering pump corresponding to the acid storage tank 411 to start, so that the acid solution flows from the acid storage tank 411 through the pipeline and into the electrolyte in the liquid preparation tank 7 through the pH dosing interface, thereby reducing the pH value.

[0037] When the chromium content detected by the control unit 3 is lower than the standard value range, it sends a command to the chromium adjustment subsystem 42. The metering pump corresponding to the chromium regulator storage tank 421 is then started, introducing the chromium regulator from the chromium regulator storage tank 421 through the pipeline and the chromium dosing interface of the liquid preparation tank 7, and adding it to the electrolyte in the liquid preparation tank 7 to increase the chromium content. If the chromium content is higher than the standard value range, the control unit 3 will stop adding the chromium regulator.

[0038] During the dosing process, the stirring device 5 runs continuously to fully stir the electrolyte in the liquid preparation tank 7, which allows the newly added agent to be quickly and evenly dispersed into the electrolyte, accelerating the speed at which the pH value and chromium content reach the standard range, and also ensuring that the electrolyte in the entire liquid preparation tank 7 is uniform in properties.

[0039] Operators can view the pH value and chromium content data received by the control unit 3 in real time through the human-machine interface 6, as well as the operating status of the device, the dosing status of the dosing system 4, and other information. According to actual production needs, operators can adjust parameters such as the standard value range on the human-machine interface 6. The control unit 3 will continue to control the pH value and chromium content according to the new parameter settings to ensure the stable operation of the electrolytic copper foil solution preparation section.

[0040] The present invention has been described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvement made by adopting the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, shall be within the protection scope of the present invention.

Claims

1. A device for automatically controlling pH and chromium content in the electrolytic copper foil preparation process, characterized in that, include: The system comprises a pH detection unit (1), a chromium content detection unit (2), a control unit (3), a dosing system (4), a stirring device (5), and a human-machine interface (6). The pH detection unit (1), the chromium content detection unit (2), the dosing system (4), and the human-machine interface (6) are electrically connected to the control unit (3). The dosing system (4) has its reagent output end connected to the liquid preparation tank (7) via a pipe for adding reagents to the liquid preparation tank (7). The stirring device (5) is located inside the liquid preparation tank (7). The dosing system (4) includes a pH adjustment subsystem (41) and a chromium adjustment subsystem (42).

2. The device for automatically controlling pH and chromium content in the electrolytic copper foil preparation section according to claim 1, characterized in that: The pH detection unit (1) includes a pH electrode and a transmitter. The signal output terminal of the pH electrode is electrically connected to the signal input terminal of the transmitter. The output terminal of the transmitter is electrically connected to the corresponding input terminal of the control unit (3). The pH extends into the interior of the liquid preparation tank (7) to detect the pH value of the electrolyte.

3. The device for automatically controlling pH and chromium content in the electrolytic copper foil preparation section according to claim 1, characterized in that: The chromium content detection unit (2) includes an online atomic absorption spectrometer (21) and a sampling pump (22). The inlet of the sampling pump (22) is connected to the sampling interface in the middle of the side wall of the liquid preparation tank (7) through a sampling pipe, and is used to extract the electrolyte sample in the liquid preparation tank (7). The outlet of the sampling pump (22) is connected to the sample inlet of the online atomic absorption spectrometer (21) through a delivery pipe, and delivers the sample to the online atomic absorption spectrometer (21). The online atomic absorption spectrometer (21) is electrically connected to the control unit (3).

4. The device for automatically controlling pH and chromium content in the electrolytic copper foil preparation section according to claim 1, characterized in that: The pH adjustment subsystem (41) includes an acid storage tank (411), an alkali storage tank (412), and a metering pump connected to the outlet of the acid storage tank (411) and the alkali storage tank (412), respectively. The outlet of the metering pump is connected to the pH dosing interface of the liquid preparation tank (7) through a pipeline.

5. The device for automatically controlling pH and chromium content in the electrolytic copper foil preparation section according to claim 4, characterized in that: The chromium conditioning subsystem (42) includes a chromium conditioning agent storage tank (421) and a metering pump connected to its outlet pipe. The outlet of the metering pump is connected to the chromium dosing interface of the liquid preparation tank (7). The inner walls of the acid storage tank (411), alkali storage tank (412) and chromium conditioning agent storage tank (421) are all provided with an anti-oxidation coating, and each is equipped with a liquid level sensor.

6. The device for automatically controlling pH and chromium content in the electrolytic copper foil preparation section according to claim 1, characterized in that: The liquid preparation tank (7) is a vertical closed tank. The top of the tank is provided with a cover plate that can be detachably connected to it. The cover plate is provided with corresponding mounting holes for the stirring device (5) and the pH electrode of the pH detection unit (1) to penetrate. The side wall of the liquid preparation tank (7) is provided with a sampling interface connected to the inlet of the sampling pump (22) of the chromium content detection unit (2) and a dosing interface connected to the outlet of the metering pump of the dosing system (4) from top to bottom. The dosing interface includes a pH dosing interface and a chromium dosing interface. Each interface is a tubular structure with a flange and is welded and fixed to the tank. The bottom of the liquid preparation tank (7) is a conical structure with a drain port with a valve at the lowest point.

7. The device for automatically controlling pH and chromium content in the electrolytic copper foil preparation section according to claim 1, characterized in that: The stirring device (5) includes a support and a stirring component. The support is L-shaped, with one end fixed to the top edge of the liquid preparation tank (7) by bolts, and the other end extending horizontally and fixedly connected to the top shell of the stirring component. The stirring component includes a magnetic rotor disposed inside the liquid preparation tank (7).

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