Circulating front-end treatment device based on electroplating wastewater

Abstract

The circulating front-end treatment device comprises a residue filtering tank, a stainless steel filter cover is fixed to the inner wall of the residue filtering tank through bolts, a medicine storage barrel is fixed to the position, located at the top of the stainless steel filter cover, in the residue filtering tank through a support, and a sealing sleeve is slidably connected to the medicine storage barrel; the rotating speed gear of the transmission assembly is used as a control basis, the electroplating wastewater at the liquid inlet is used as a detection object, the rotating shafts are controlled to rotate according to the pH value of the electroplating wastewater, and the rotating shaft I in low-speed rotation drives the rotating shaft II and the elastic scraping plate to rotate, so that large-particle impurities intercepted on the inner wall of the stainless steel filter casing are circularly scraped; the rotating shaft I drives the rotating arm on the rotating shaft II to rotate while increasing the rotating speed, the groove sleeve side friction disc is separated from the friction sleeve on the rotating shaft I under the pulling of the connecting rod, and meanwhile, the sealing sleeve at the bottom of the medicine storage barrel is opened, so that the medicine is automatically added.

Description

Technical Field

[0001] The present invention relates to the technical field of front-end treatment of electroplating wastewater, and specifically relates to a circulating front-end treatment device for electroplating wastewater. Background Art

[0002] Electroplating wastewater refers to the wastewater containing heavy metals, acids, alkalis, organic substances and other pollutants generated during the electroplating production process. It has the characteristics of high toxicity, complex composition and high treatment difficulty. The treatment methods usually include chemical precipitation method, ion exchange method, membrane separation technology, electrolysis method and biological treatment method, etc. For example, the patent text with the publication number CN222476213U relates to the chemical precipitation method. It drives the piston to move upward through a cylinder. When the piston moves upward, the air pressure inside the fixed cylinder decreases, and the reagent will enter the fixed cylinder through the liquid suction pipe. Then the cylinder drives the piston to move downward, and the reagent is discharged from the second one-way valve. The cylinder reciprocates to achieve the purpose of quantitative dosing, ensuring the accuracy of dosing. The entire dosing mechanism is isolated and evacuated through the medicine suction pipe. However, there is a lack of management for the separate storage of reagents, and problems such as uneven components such as stratification will occur due to the long-term storage of reagents during the evacuation process, resulting in large differences in the subsequent reaction effects. Secondly, at the initial stage of electroplating wastewater treatment, large-particle impurities are not intercepted, resulting in an increase in the impurity content of the electroplated wastewater after chemical treatment. For this reason, we propose a circulating front-end treatment device for electroplating wastewater. Summary of the Invention

[0003] The purpose of the present invention is to provide a circulating front-end treatment device for electroplating wastewater to solve the problems raised in the above background art.

[0004] To achieve the above purpose, the present invention provides the following technical solution: A circulating front-end treatment device for electroplating wastewater, including a filter residue tank. The inner wall of the filter residue tank is fixed with a stainless steel filter cover by bolts. Inside the filter residue tank and above the stainless steel filter cover, a medicine storage cylinder is fixed by a bracket. A sealing sleeve is slidably connected to the medicine storage cylinder. Drainage grooves are symmetrically opened on the outer wall of the sealing sleeve. Inside the filter residue tank and on the sealing sleeve, a second rotating shaft is installed, and the sealing sleeve is slidably connected to the second rotating shaft. Elastic scraping plates are symmetrically installed on the outer wall of the second rotating shaft and inside the stainless steel filter cover. On the outer wall of the second rotating shaft and symmetrically at the center of the filter residue tank, a rotating arm is rotatably connected. The end of the rotating arm is fixed with a counterweight ball by welding. The end of the connecting rod on the rotating arm is movably connected to the corresponding outer walls on both sides of the sealing sleeve. A conical sleeve is sleeved and slidably connected on the outer wall of the second rotating shaft and above the rotating arm. The connecting rod at the end of the rotating arm is movably connected to the corresponding outer wall of the conical sleeve.

[0005] Further, a transmission assembly is fixed to the top of the filter residue tank by bolts. The output end of the transmission assembly is fixedly connected to a first rotating shaft, and the end of the first rotating shaft penetrates through the top of the filter residue tank and is fixedly connected with a friction cover by welding.

[0006] Further, a groove sleeve is sleeved and slidably connected on the second rotating shaft, and the groove sleeve is slidably connected with the second rotating shaft. A friction disc is fixed to the top of the groove sleeve, and the friction disc is correspondingly abutted against the friction cover. A spring is sleeved and installed on the outer wall of the second rotating shaft, and one side of the spring abuts against the bottom of the groove sleeve.

[0007] Further, folding rods are symmetrically and rotatably connected to the inner wall of the top of the filter residue tank. One end of the folding rod abuts against the notch on the groove sleeve, and the other end of the folding rod abuts against the outer wall of the conical sleeve.

[0008] Further, a chemical adding port is formed in the top of the filter residue tank, and the bottom of the chemical adding port is connected to a medicine storage cylinder through a connecting pipe.

[0009] Further, a liquid inlet is formed in the outer wall of the filter residue tank, and the bottom of the liquid inlet is flush with the stainless steel filter cover. A liquid outlet is formed in the outer wall of the filter residue tank.

[0010] Further, a slag discharge pipe is fixedly connected to the bottom of the filter residue tank in a communicating manner. A ball valve is installed on the filter residue tank, and a control box is fixedly connected to the outer wall of the filter residue tank through a bracket.

[0011] The front-end treatment method for the circulation of electroplating wastewater is as follows: Physical pretreatment: The electroplating wastewater discharged from the side of the liquid inlet enters the inner side of the stainless steel filter cover. After being intercepted and filtered by the stainless steel filter cover, metal chips with a size of ≥5 mm adhere to the inner wall of the stainless steel filter cover. The first rotating shaft driven by the transmission assembly rotates, and the friction cover on the first rotating shaft drives the friction disc to rotate, realizing the rotation of the elastic scraper on the outer wall of the second rotating shaft to remove the adhered metal chips. The accumulated metal chips are located at the bottom of the filter residue tank and are automatically discharged by opening the ball valve. Chemical agent addition: The acidity and alkalinity of the electroplating wastewater are automatically detected according to the pH sensor installed on the side of the liquid inlet. When the detected pH value of the electroplating wastewater is greater than 9 or less than 7, the control box automatically increases the rotation speed of the first rotating shaft. When the first rotating shaft rotates, the counterweight ball at the end of the rotating arm on the second rotating shaft rotates to stir and mix the agents in the medicine storage cylinder. As the rotation speed increases, the rotation height of the rotating arm increases, causing the sealing sleeve connected by the connecting rod to slide on the surface of the second rotating shaft, resulting in the communication between the liquid discharge groove and the medicine storage cylinder, and the agent automatically enters the electroplating wastewater to complete the automatic addition of the agent.

[0012] Compared with the prior art, the beneficial effects of the present invention are: In the present invention, based on the rotational speed gear of the transmission component, the electroplating wastewater at the liquid inlet is taken as the detection object, and the rotation of the rotating shaft is controlled according to the pH value of the electroplating wastewater. When rotating at a low speed, the first rotating shaft drives the second rotating shaft and the elastic scraping plate to rotate, and cyclically scrapes the large-particle impurities intercepted on the inner wall of the stainless-steel filter cover. Along with the opening of the ball valve on the slag discharge pipe, the metal debris is automatically removed, and at the same time, the precipitation of heavy metal ions in the electroplating wastewater is accelerated. When the rotational speed of the first rotating shaft increases, the swivel arm on the second rotating shaft rotates, and under the pulling of the connecting rod, the side friction disc of the groove sleeve is disengaged from the friction sleeve on the first rotating shaft. At the same time, the sealing sleeve at the bottom of the medicine storage cylinder opens, and while automatically adding medicine, without the input of transmission power, the rotational speed of the second rotating shaft decreases, resulting in the end of medicine discharge. Subsequently, after the friction disc and the friction sleeve come into contact again, a new round of rotational speed increase and feeding begins, and the medicine is dosed at intervals and quantitatively to automatically adjust the pH value of the electroplating wastewater. While discharging the medicine, the swivel arm can also stir the medicine to improve the subsequent reaction rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 FIG. is a schematic diagram of the overall structure of the front-end treatment device for the circulation of electroplating wastewater according to the present invention; Figure 2 FIG. is a schematic sectional structure diagram of the front-end treatment device for the circulation of electroplating wastewater according to the present invention; Figure 3 FIG. is a schematic installation structure diagram of the elastic scraping plate on the second rotating shaft according to the present invention; Figure 4 FIG. is a schematic diagram of the abutting structure between the friction cover on the first rotating shaft and the friction disc on the groove sleeve according to the present invention; Figure 5 FIG. is a schematic diagram of the connection of the swivel arm to the conical sleeve and the sealing sleeve through the connecting rod according to the present invention; Figure 6 FIG. is a schematic diagram of the state of the swivel arm when the first rotating shaft rotates at a low speed according to the present invention; Figure 7 FIG. is a schematic diagram of the state of the swivel arm when the first rotating shaft rotates at a high speed according to the present invention.

[0014] In the figure: 1, filter residue tank; 2, transmission component; 3, first rotating shaft; 4, control box; 5, liquid inlet; 6, liquid outlet; 7, slag discharge pipe; 8, ball valve; 9, medicine adding port; 10, stainless-steel filter cover; 11, second rotating shaft; 12, elastic scraping plate; 13, medicine storage cylinder; 14, friction cover; 15, groove sleeve; 16, friction disc; 17, swivel arm; 18, sealing sleeve; 19, liquid discharge groove; 20, conical sleeve; 21, folding rod; 22, spring. DETAILED DESCRIPTION OF THE INVENTION

[0015] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0016] Please refer to Figures 1-7 , the present invention provides a technical solution: Embodiment 1: The components of electroplating wastewater are complex, containing heavy metals, acids and alkalis, and organic substances. High-efficiency pretreatment is required to achieve recycling. The grille and filter set up in the early stage are used to remove large-particle solid impurities in the wastewater. Subsequently, the pH adjustment of the wastewater is carried out. The core of adjusting the pH value to promote metal precipitation lies in using the solubility difference of metal hydroxides. By controlling the pH value of the solution, heavy metal ions are converted into insoluble hydroxide precipitates to promote metal precipitation. Metal ions such as Cu²⁺, Ni²⁺, Cr³⁺, etc. will combine with hydroxide ions in water to form hydroxide precipitates. As Figure 1 shown, the front-end treatment device for the recycling of electroplating wastewater is based on the traditional sewage filter residue tank 1, and the relatively existing stainless steel filter cover 10 is used for impurity interception. Therefore, a liquid inlet 5 and a liquid outlet 6 are provided on the outer wall of the filter residue tank 1. As Figure 2 shown, the liquid inlet 5 is flush with the stainless steel filter cover 10. The discharged electroplating wastewater comes to the inside of the stainless steel filter cover 10. After being filtered by the stainless steel filter cover 10, large-particle metal debris adheres to the inner wall of the stainless steel filter cover 10, and the filtered electroplating wastewater is discharged through the liquid outlet 6 for subsequent in-depth treatment. As the interception time increases, the amount of debris on the inner wall of the stainless steel filter cover 10 increases, affecting the liquid flow rate, and debris cleaning is required. As Figure 2 shown, a rotating shaft two 11 is installed inside the stainless steel filter cover 10, and an elastic scraper 12 is connected and fixed to the rotating shaft two 11. As the rotating shaft two 11 rotates, the elastic scraper 12 is driven to clean the inner wall of the stainless steel filter cover 10 to scrape off the debris. At the same time, in cooperation with the opening of the ball valve 8 on the bottom slag discharge pipe 7, a small amount of wastewater with a high impurity content is automatically discharged. After centralized filter residue treatment, the electroplating solution is re-fed into the filter residue tank 1 for treatment. Regarding the rotation of the rotating shaft two 11, as Figure 3 and Figure 4As shown in the figure, the end of the second rotating shaft 11 is installed in the groove sleeve 15, which facilitates the rotation of the second rotating shaft 11. The friction disc 16 is installed on the top of the groove sleeve 15, and the transmission assembly 2 is installed on the top of the filter residue tank 1. The output end of the motor in the transmission assembly 2 is connected to the first rotating shaft 3. The motor drives the entire first rotating shaft 3 to rotate. The first rotating shaft 3 and the second rotating shaft 11 are not in direct contact. The end of the first rotating shaft 3 is fixedly connected with a friction cover 14. The friction disc 16 on the second rotating shaft 11 abuts against the friction cover 14 to realize the rotation of the second rotating shaft 11. For this purpose, a spring 22 is installed on the outer wall of the second rotating shaft 11. The spring 22 applies an upward elastic force to abut against the groove sleeve 15, and finally realizes the rotation of the second rotating shaft 11 with the continuous discharge of electroplating wastewater for cyclic treatment.

[0017] Embodiment 2: Since the heavy metal ion content in the electroplating wastewater exceeds the standard, in order to further pre-treat the wastewater, a medicine adding assembly is installed in the entire filter residue tank 1 to adjust the pH value during the preliminary filtration of the electroplating wastewater. For this purpose, a medicine storage cylinder 13 is installed in the filter residue tank 1; As Figure 5 shown, the medicine storage cylinder 13 is fixed on the inner wall of the filter residue tank 1, and the second rotating shaft 11 directly passes through it. A sealing sleeve 18 is sleeved and slidably connected at the position where the second rotating shaft 11 passes through the medicine storage cylinder 13. The medicine adding port 9 provided at the top of the filter residue tank 1 is responsible for feeding the prepared medicine into the medicine storage cylinder 13. Along with the installation of the sealing sleeve 18 for plugging the medicine discharging hole, the rotation of the second rotating shaft 11 drives the sealing sleeve 18 to rotate. A rotating arm 17 is also rotatably connected to the outer wall of the second rotating shaft 11. A counterweight ball is provided at the end of the rotating arm 17. The connecting rod on the rotating arm 17 is connected to the sealing sleeve 18, and the other end of the rotating arm 17 is connected to a conical sleeve 20 sleeved on the second rotating shaft 11 through a connecting rod; When cleaning the inner wall of the stainless steel filter cover 10 in Embodiment 1, the low-speed first rotating shaft 3 drives the second rotating shaft 11 to rotate synchronously. At this time, due to the low rotation speed, the rotating arm 17 on the second rotating shaft 11 cannot rotate and open. At this time, only the elastic scraper 12 plays an accompanying cleaning role; When the on-line pH sensor at the liquid inlet 5 at the front end of the filter residue tank 1 detects that the pH value of the electroplating wastewater is abnormal, the abnormal value can be input into the control box 4 in advance. The abnormal value of the electroplating wastewater is determined according to the optimal precipitation pH range of different metals. Usually, the abnormal value of the electroplating wastewater is that the pH value is greater than 9 or less than 7. Most heavy metals have the best precipitation effect in the pH range of 7-9. This is also the reason why this range is often selected in the treatment of electroplating wastewater. Therefore, when the pH value of the electroplating wastewater is detected to be abnormal, medicine is actively added for adjustment. The medicine is usually sulfuric acid or sodium hydroxide. For the electroplating wastewater containing chromium, sodium metabisulfite will also be added to reduce Cr 6 ⁺ to Cr³⁺, and the ORP is controlled at -200 mV~-300 mV. Usually, the medicine adding operation is carried out step by step. First, the pH value is adjusted, and then other medicines are added; When performing the automatic addition operation of the medicament, the control box 4 on the outer wall of the filter residue tank 1 adjusts the rotation speed of the entire first rotating shaft 3. After the rotation speed of the first rotating shaft 3 is increased, when the rotating arm 17 on the second rotating shaft 11 rotates, it begins to unfold in the medicine storage cylinder 13, as Figure 7 shown. The connecting rod on the rotating arm 17 starts to pull up the sealing sleeve 18 on the second rotating shaft 11. There is also a liquid discharge groove 19 on the outer wall of the sealing sleeve 18. The rising sealing sleeve 18 causes the liquid discharge groove 19 to communicate with the medicine storage cylinder 13, and the medicament flows into the stainless steel filter cover 10 along the liquid discharge groove 19, completing the automatic addition of the medicament; Since the rotation speed of the first rotating shaft 3 is the core of the entire dosing adjustment, to avoid the transmission component 2 frequently adjusting the rotation speed of the first rotating shaft 3 to achieve the automatic dosing operation, as Figure 5 and Figure 6 shown, the connecting rod at the end of the rotating arm 17 is also movably connected with a tapered sleeve 20. The folding rods 21 are symmetrically and rotatably connected to the inner wall of the top of the filter residue tank 1. Along with the rotation of the high-speed first rotating shaft 3, while the rotating arm 17 rotates and floats, it pulls down the entire tapered sleeve 20, causing the folding rod 21 in contact with one side to touch the inclined surface of the tapered sleeve 20, resulting in the folding rod 21 rotating towards the bottom. The groove sleeve 15 abutted against the other end of the folding rod 21 moves downward synchronously under pressure, causing the friction disc 16 to disengage from the friction cover 14. At this time, the transmission component 2 normally drives the first rotating shaft 3 to rotate at a high speed, while the rotation speed of the second rotating shaft 11 without the input of transmission energy begins to decrease. At the same time, the floating height of the rotating arm 17 on the second rotating shaft 11 decreases synchronously until the tapered sleeve 20 resets, and with the spring 22 pushing up the groove sleeve 15, the friction disc 16 contacts the friction cover 14 again, driving the second rotating shaft 11 to rotate at a high speed again; The low-speed rotation of the second rotating shaft 11 causes the sealing sleeve 18 to seal the medicine storage cylinder 13. Therefore, the cyclic variable-speed rotation of the second rotating shaft 11 realizes the intermittent dosing operation of the entire filter residue tank 1. At the same time, the rotation of the rotating arm 17 in the medicine storage cylinder 13 can also realize the stirring and mixing of the medicament, avoiding the precipitation problem of the medicament stored for a long time. Through the gear adjustment of the transmission component 2, the automatic addition of the medicament in the medicine storage cylinder 13 can be realized, and the intermittent quantitative dosing can realize the automatic adjustment of the pH value of the electroplating wastewater. When discharging the medicine, rotating the rotating arm 17 can also stir the medicament, improving the subsequent reaction rate.

[0018] The working principle of the present invention is as follows: The electroplating wastewater discharged from the side of the liquid inlet 5 enters the inner side of the stainless steel filter cover 10. After being intercepted and filtered by the stainless steel filter cover 10, metal chips with a size of ≥5 mm adhere to the inner wall of the stainless steel filter cover 10. Driven by the transmission component 2, the first rotating shaft 3 rotates, and the friction cover 14 on the first rotating shaft 3 drives the friction disc 16 to rotate, realizing the rotation of the elastic scraping plate 12 on the outer wall of the second rotating shaft 11 to remove the adhered metal chips. The accumulated metal chips are located at the bottom of the filter residue tank 1 and are automatically discharged by opening the ball valve 8; The pH sensor installed on the side of the liquid inlet 5 is used to automatically detect the pH value of the electroplating wastewater. When it is detected that the pH value of the electroplating wastewater is greater than 9 or less than 7, the control box 4 automatically increases the rotation speed of the rotating shaft 3. The rotation of the rotating shaft 3 causes the counterweight ball at the end of the rotating arm 17 on the rotating shaft 2 11 to rotate, so as to stir and mix the medicine in the medicine storage cartridge 13. As the rotation speed increases, the rotation height of the rotating arm 17 increases, causing the sealing sleeve 18 connected to the connecting rod to slide on the surface of the rotating shaft 2 11, causing the drainage groove 19 to be connected to the medicine storage cartridge 13, and the medicine automatically enters the electroplating wastewater, completing the automatic addition of the medicine.

[0019] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A front-end treatment device for recycling electroplating wastewater, including a filter residue tank (1), characterized in that, The inner wall of the filter residue tank (1) is fixed with a stainless steel filter cover (10) by bolts. Inside the filter residue tank (1) and at the top of the stainless steel filter cover (10), a medicine storage cylinder (13) is fixed by a bracket. A sealing sleeve (18) is slidably connected to the medicine storage cylinder (13). Drainage grooves (19) are symmetrically formed on the outer wall of the sealing sleeve (18). Inside the filter residue tank (1) and on the sealing sleeve (18), a second rotating shaft (11) is installed, and the sealing sleeve (18) is slidably connected to the second rotating shaft (11). Elastic scraping plates (12) are symmetrically installed on the outer wall of the second rotating shaft (11) and inside the stainless steel filter cover. On the outer wall of the second rotating shaft (11) and symmetrically at the center inside the filter residue tank (1), a rotating arm (17) is rotatably connected. The end of the rotating arm (17) is fixed with a counterweight ball by welding. The end of the connecting rod on the rotating arm (17) is movably connected to the corresponding outer walls on both sides of the sealing sleeve (18). A conical sleeve (20) is sleeved and slidably connected on the outer wall of the second rotating shaft (11) and above the rotating arm (17). The connecting rod at the end of the rotating arm (17) is movably connected to the outer wall of the conical sleeve (20).

2. The front-end treatment device for recycling based on electroplating wastewater according to claim 1, wherein On the top of the filter residue tank (1), a transmission assembly (2) is fixed by bolts. The output end of the transmission assembly (2) is fixedly connected with a first rotating shaft (3). The end of the first rotating shaft (3) penetrates through the top of the filter residue tank (1) and is fixed with a friction cover (14) by welding.

3. The recycling front-end treatment device for electroplating wastewater according to claim 2, wherein, A groove sleeve (15) is sleeved and slidably connected on the second rotating shaft (11), and the groove sleeve (15) is slidably connected to the second rotating shaft (11). A friction disc (16) is fixed on the top of the groove sleeve (15). The friction disc (16) is in corresponding abutment with the friction cover (14). A spring (22) is sleeved and installed on the outer wall of the second rotating shaft (11). One side of the spring (22) abuts against the bottom of the groove sleeve (15).

4. The circular front-end treatment device based on electroplating wastewater according to claim 3, wherein, On the top inner wall of the filter residue tank (1), folding rods (21) are symmetrically rotatably connected. One end of the folding rod (21) abuts against the notch on the groove sleeve (15), and the other end of the folding rod (21) abuts against the outer wall of the conical sleeve (20).

5. The recycling front-end treatment device for electroplating wastewater according to claim 4, wherein, A medicine adding port (9) is formed on the top of the filter residue tank (1). The bottom of the medicine adding port (9) is connected to the medicine storage cylinder (13) through a connecting pipe.

6. The front-end treatment device for recycling based on electroplating wastewater according to claim 5, wherein A liquid inlet (5) is formed on the outer wall of the filter residue tank (1), and the bottom of the liquid inlet (5) is flush with the stainless steel filter cover (10). A liquid outlet (6) is formed on the outer wall of the filter residue tank (1).

7. The front-end treatment device for recycling based on electroplating wastewater according to claim 6, characterized in that, A slag discharge pipe (7) is connected and fixed to the bottom of the filter residue tank (1). A ball valve (8) is installed on the filter residue tank (1). A control box (4) is fixedly connected to the outer wall of the filter residue tank (1) through a bracket.

8. The recycling front-end treatment device based on electroplating wastewater according to claim 7, characterized in that The front-end treatment method for the circulation of electroplating wastewater is as follows: Physical pretreatment: The electroplating wastewater discharged from the side of the liquid inlet (5) enters the inner side of the stainless steel filter cover (10). After being intercepted and filtered by the stainless steel filter cover (10), metal chips with a size of ≥5 mm adhere to the inner wall of the stainless steel filter cover (10). The rotation of the first rotating shaft (3) driven by the transmission component (2) causes the friction disc (16) to rotate driven by the friction cover (14) on the first rotating shaft (3), realizing the rotation of the elastic scraper (12) on the outer wall of the second rotating shaft (11) to remove the adhered metal chips. The accumulated metal chips are located at the bottom of the filter residue tank (1) and are automatically discharged by opening the ball valve (8). Chemical reagent addition: The acidity and alkalinity of the electroplating wastewater are automatically detected according to the pH sensor installed on the side of the liquid inlet (5). When the pH value of the electroplating wastewater is detected to be greater than 9 or less than 7, the control box (4) automatically increases the rotation speed of the first rotating shaft (3). When the first rotating shaft (3) rotates, the counterweight ball at the end of the rotating arm (17) on the second rotating shaft (11) rotates, stirring and mixing the reagents in the reagent storage cylinder (13). As the rotation speed increases, the rotation height of the rotating arm (17) increases, causing the sealing sleeve (18) connected by the connecting rod to slide on the surface of the second rotating shaft (11), resulting in the communication between the liquid discharge groove (19) and the reagent storage cylinder (13), and the reagent automatically enters the electroplating wastewater to complete the automatic addition of the reagent.

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