Sulfuric acid automatic liquid preparation device for single-head welding wire and copper plating wire

Abstract

The utility model discloses an automatic sulfuric acid liquid preparation device for a single-head welding wire copper plating wire, which comprises a mounting plate, a storage tank for storing sulfuric acid is arranged at the upper part of one side of the mounting plate, a bracket is arranged at the lower part of one side of the mounting plate and is positioned below the storage tank, and a piston cylinder is fixedly arranged at the top of the bracket; the bottom of the storage tank is communicated with an inner cavity of the piston barrel through an output assembly, the inner cavity of the piston barrel is connected with a piston disc in a sliding mode, and the outer circle face of the piston disc is sleeved with a sealing ring used for preventing the piston disc from making direct contact with the inner wall of the piston barrel. And meanwhile, the sealing ring prevents the piston disc from directly contacting with the inner wall of the piston cylinder, friction abrasion between the piston disc and the piston cylinder is reduced, abrasion is reduced, sealing performance of the piston cylinder is guaranteed, sulfuric acid leakage is prevented, and quantitative precision of sulfuric acid is guaranteed.

Description

Technical Field

[0001] This utility model belongs to the technical field of production equipment for single-ended copper-plated welding wire, specifically relating to an automatic sulfuric acid dispensing device for single-ended copper-plated welding wire. Background Technology

[0002] Copper plating on the surface of the welding wire can reduce resistance, allowing the welding current to pass through the wire more smoothly, thus ensuring the stability of the welding process, improving welding quality, and reducing welding defects. Furthermore, adding sulfuric acid to the copper plating solution can significantly improve the conductivity of the solution. Good conductivity allows the current to be evenly distributed in the plating solution, ensuring that the copper plating layer thickness is uniform throughout the welding wire surface, thereby improving the quality and stability of the copper plating.

[0003] Chinese Patent Publication No. CN222287143U discloses a copper sulfate solution preparation device, including a base, a cylinder fixedly connected to the middle of the base, a motor fixedly connected to the bottom of the cylinder, a rotating shaft rotatably connected to the bottom of the cylinder, the bottom of the rotating shaft fixedly connected to the output end of the motor, a fan blade fixedly connected to the other end of the rotating shaft, a cylinder cover provided on the top of the cylinder, connecting blocks fixedly connected to opposite sides of the outer side of the cylinder, a positioning post rotatably connected inside the connecting block, a limit post fixedly connected outside the positioning post, and a sliding post slidably connected outside the positioning post. In this invention, by pulling the sliding post, the rotating bar is driven to disengage from the locking block, realizing the quick fixing and disassembly of the cylinder and the cylinder cover, thus reducing the trouble of disassembly and installation for workers.

[0004] Although the above-mentioned device enables quick fixing and disassembly of the cylinder and the cylinder cover, reducing the trouble of disassembly and installation for workers, the wear between the slider and the slide rail will cause changes in the sliding resistance, resulting in inaccurate slider movement distance, which in turn affects the quantitative accuracy of the dispensing.

[0005] To address this, an automatic sulfuric acid dispensing device for single-ended copper-plated welding wire is proposed. Utility Model Content

[0006] The purpose of this invention is to provide an automatic sulfuric acid dispensing device for single-head copper-plated welding wire to solve the technical defect of inaccurate dispensing quantity.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] An automatic sulfuric acid dispensing device for single-ended copper plating wire includes a mounting plate. A storage tank for storing sulfuric acid is located on the upper side of one side of the mounting plate. A bracket is located on the lower side of the mounting plate, below the storage tank. A piston cylinder is fixedly mounted on the top of the bracket. The bottom of the storage tank is connected to the inner cavity of the piston cylinder via an output component. A piston disc is slidably connected to the inner cavity of the piston cylinder. A sealing ring is fitted on the outer circumference of the piston disc to prevent direct contact between the piston disc and the inner wall of the piston cylinder. The end of the piston cylinder is connected to a copper plating tank via a connecting component. A pushing component is provided at the opening of the piston cylinder to push the piston disc inward, thereby allowing the sulfuric acid drawn from inside the piston cylinder to enter the copper plating tank through the connecting component. The upper part of the mounting plate is fixedly mounted on the wall of the copper plating tank via a fixing component.

[0009] As a preferred embodiment of this utility model, the output component includes a solenoid valve connected to the bottom of one side of the storage tank, the output end of the solenoid valve is connected to a flow meter, the output end of the flow meter is connected to an input pipe, and the end of the input pipe is connected to the upper side of the end of the piston cylinder.

[0010] As a preferred embodiment of this utility model, the connecting component includes a circular shell connected to the center of the piston cylinder end, an output pipe connected to the bottom of one side of the circular shell, and the other end of the output pipe connected to the inner cavity of the copper plating tank. The end of the circular shell is connected to an installation cylinder via a detachable connector, and the inner cavity of the installation cylinder is provided with a sealing component for sealing the outlet of the output pipe when the piston cylinder draws sulfuric acid.

[0011] The detachable connector includes an internal thread on the end surface of the circular housing, and a threaded ring is threadedly connected to the end of the circular housing via the internal thread. The threaded ring is fixedly sleeved on the end of the mounting cylinder.

[0012] As a preferred embodiment of the present invention, the sealing assembly includes a sealing post disposed inside the circular housing. A connecting rod is fixedly connected to the end of the sealing post near the mounting cylinder. The end of the connecting rod penetrates the circular housing and extends into the interior of the mounting cylinder. A sliding disc is fixedly connected to the end of the connecting rod located inside the mounting cylinder. A spring is disposed at the other end of the sliding disc, and the other end of the spring contacts the inner cavity of the mounting cylinder.

[0013] As a preferred embodiment of this utility model, the pushing member includes a fixed plate fixedly installed at the opening of the piston cylinder, an electric push rod fixedly installed on the outer surface of the fixed plate, and the telescopic end of the electric push rod extends into the inner cavity of the piston cylinder and is fixedly connected to the end of the piston disc.

[0014] As a preferred embodiment of this utility model, the fastener includes a fixing bolt threaded to the upper part of the mounting plate. The mounting plate is arranged in a figure-7 shape and the upper end is bent downward to form a slot for engaging with the wall of the copper plating tank.

[0015] As a preferred embodiment of this utility model, a controller and a placement rod are fixedly installed on the front surface of the mounting plate. A wire is placed on the surface of the placement rod. One end of the wire is connected to the signal input terminal of the controller, and the other end of the wire is connected to the sulfuric acid meter. The electric push rod and the solenoid valve are both controlled by the controller. The signal output terminal of the flow meter is connected to the signal input of the controller through a cable.

[0016] Compared with existing technologies, the automatic sulfuric acid dispensing device for single-ended copper-plated welding wire of this utility model has the following advantages:

[0017] 1. This device, through the arrangement of a piston disc and a piston cylinder, and the cooperation between the piston cylinder and the piston disc, achieves the extraction and injection of sulfuric acid by sliding the piston disc. It can accurately control the amount of sulfuric acid delivered. At the same time, the sealing ring prevents the piston disc from directly contacting the inner wall of the piston cylinder, which helps to reduce friction and wear between the two, thereby reducing wear. It also ensures the sealing of the piston cylinder, preventing sulfuric acid leakage and providing a guarantee for ensuring the quantitative accuracy of sulfuric acid.

[0018] 2. This device, through the settings of the controller, controls the operation of the electric push rod and solenoid valve according to the set parameters to achieve automated liquid dispensing. In addition, the sulfuric acid meter monitors the sulfuric acid concentration in the copper plating tank in real time and feeds the data back to the controller. The controller automatically adjusts the amount of sulfuric acid added based on the feedback data and the standard concentration, ensuring the stability and accuracy of the sulfuric acid concentration in the copper plating tank. At the same time, the placement rod facilitates the organization and placement of wires, avoiding messy wires that may affect the normal operation of the equipment.

[0019] 3. This device uses the sealing component and the spring force to seal and open the outlet pipe. When the piston cylinder draws sulfuric acid, the spring pushes the sliding plate, which drives the sealing column to close the outlet pipe through the connecting rod. When the piston cylinder injects sulfuric acid, the sulfuric acid pressure overcomes the spring force, causing the sealing column to open the outlet pipe. The structure is simple and reliable, and can effectively prevent sulfuric acid leakage and backflow. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only examples of embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0022] Figure 2 This is a cross-sectional view of the piston cylinder in an embodiment of the present invention;

[0023] Figure 3This is a cross-sectional view of the circular shell in an embodiment of the present invention.

[0024] Figure label:

[0025] 100. Mounting plate; 101. Slot; 102. Fixing bolt; 103. Fixing bracket; 104. Storage tank; 105. Bracket;

[0026] 200. Controller; 201. Placement rod; 202. Wire; 203. Sulfuric acid meter;

[0027] 300. Solenoid valve; 301. Flow meter; 302. Inlet pipe;

[0028] 400. Piston cylinder; 401. Fixed plate; 402. Electric push rod; 403. Piston disc; 404. Circular housing; 405. Output pipe; 406. Sealing ring;

[0029] 500, Internal thread; 501, Threaded ring; 502, Mounting cylinder; 503, Sealing post; 504, Connecting rod; 505, Sliding disc; 506, Spring. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0031] In the description of the embodiments of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0032] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation", "connection" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, an integral connection, or a detachable connection; they can refer to the internal connection of two components; they can refer to a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of this utility model can be understood according to the specific circumstances.

[0033] See appendix Figure 1-3As shown in the figure, an automatic sulfuric acid dispensing device for single-ended copper-plated welding wire according to an embodiment of the present invention includes a mounting plate 100. A storage tank 104 for storing sulfuric acid is provided on the upper part of one side of the mounting plate 100. Fixing frames 103 are fixedly connected to both the upper and lower parts of one side of the storage tank 104. The two sets of fixing frames 103 are respectively fixedly connected to the surface of the mounting plate 100. A bracket 105 is provided on the lower part of one side of the mounting plate 100 and below the storage tank 104. A piston cylinder 400 is fixedly installed on the top of the bracket 105. The bottom of the storage tank 104 is connected to the output component. The inner cavity of the piston cylinder 400 is interconnected, and a piston disc 403 is slidably connected to the inner cavity of the piston cylinder 400. A sealing ring 406 is fitted on the outer circumference of the piston disc 403 to prevent direct contact between the piston disc 403 and the inner wall of the piston cylinder 400. The end of the piston cylinder 400 is connected to a copper plating tank via a connecting assembly. A pushing component is provided at the opening of the piston cylinder 400 to push the piston disc 403 inward, thereby allowing the sulfuric acid extracted from inside the piston cylinder 400 to enter the copper plating tank through the connecting assembly. The upper part of the mounting plate 100 is fixedly installed on the wall of the copper plating tank by a fixing component. The sliding of the piston disc 403 enables the extraction and injection of sulfuric acid, allowing for precise control of the sulfuric acid delivery rate. Simultaneously, the sealing ring 406 prevents the piston disc 403 from directly contacting the inner wall of the piston cylinder 400, helping to reduce friction and wear between the two, thus reducing wear. This also ensures the sealing of the piston cylinder 400, preventing sulfuric acid leakage and guaranteeing the quantitative accuracy of sulfuric acid delivery.

[0034] The output component includes a solenoid valve 300 connected to the bottom of one side of the storage tank 104. The output end of the solenoid valve 300 is connected to a flow meter 301, and the output end of the flow meter 301 is connected to an input pipe 302. The end of the input pipe 302 is connected to the upper end of the piston cylinder 400. The solenoid valve 300 precisely controls the flow of sulfuric acid from the storage tank 104 to the piston cylinder 400, enabling automated control in conjunction with the controller 200, improving the accuracy and efficiency of solution preparation. Furthermore, the flow meter 301 can monitor the sulfuric acid flow rate in real time and feed the data back to the controller 200, allowing the controller 200 to precisely control the amount of sulfuric acid flowing into the piston cylinder 400 according to set parameters, ensuring the accuracy of solution preparation.

[0035] The solenoid valve 300 can be the Delixi CDMF series fluoropolymer-lined solenoid valve 300, and the flow meter 301 can be the Yokogawa ADMAG AXR series electromagnetic flow meter 301.

[0036] The connecting assembly includes a circular housing 404 connected to the center of the end of the piston cylinder 400. One bottom side of the circular housing 404 is connected to an output pipe 405, and the other end of the output pipe 405 is connected to the inner cavity of the copper plating tank. The end of the circular housing 404 is connected to an installation cylinder 502 via a detachable connector. The inner cavity of the installation cylinder 502 is provided with a sealing assembly that seals the opening of the output pipe 405 when the piston cylinder 400 draws sulfuric acid.

[0037] The detachable connector includes an internal thread 500 on the end surface of the circular housing 404. A threaded ring 501 is threadedly connected to the end of the circular housing 404 via the internal thread 500. The threaded ring 501 is fixedly sleeved on the end of the mounting cylinder 502. The circular housing 404 and the output pipe 405 form a channel for sulfuric acid to flow from the piston cylinder 400 into the copper plating tank, ensuring smooth delivery of sulfuric acid. Furthermore, the detachable connector facilitates the disassembly and installation of the mounting cylinder 502 and the circular housing 404, making it convenient for maintenance and replacement of internal components such as the sealing assembly.

[0038] The sealing assembly includes a sealing post 503 disposed inside a circular housing 404. A connecting rod 504 is fixedly connected to the end of the sealing post 503 near the mounting cylinder 502. The end of the connecting rod 504 penetrates the circular housing 404 and extends into the mounting cylinder 502. A sliding disc 505 is fixedly connected to the end of the connecting rod 504 inside the mounting cylinder 502. A spring 506 is disposed at the other end of the sliding disc 505, and the other end of the spring 506 contacts the inner cavity of the mounting cylinder 502. The sealing post 503 seals and opens the outlet pipe 405 using the elastic force of the spring 506. When the piston cylinder 400 draws sulfuric acid, the spring 506 pushes the sliding disc 505, which in turn drives the sealing post 503 to close the outlet pipe 405 via the connecting rod 504. When the piston cylinder 400 injects sulfuric acid, the sulfuric acid pressure overcomes the elastic force of the spring 506, causing the sealing post 503 to open the outlet pipe 405. The structure is simple and reliable, and can effectively prevent sulfuric acid leakage and backflow.

[0039] The pushing component includes a fixing plate 401 fixedly installed at the inlet of the piston cylinder 400. An electric push rod 402 is fixedly installed on the outer surface of the fixing plate 401. The telescopic end of the electric push rod 402 extends into the inner cavity of the piston cylinder 400 and is fixedly connected to the end of the piston disc 403. As a pushing component, the electric push rod 402 can precisely control the movement of the piston disc 403, realizing the extraction and injection of sulfuric acid, avoiding manual operation, and improving the safety of workers.

[0040] The fasteners include fixing bolts 102 threadedly connected to the upper part of the mounting plate 100. The mounting plate 100 is shaped like a "7" and its upper end is bent downward to form a slot 101 for engaging with the wall of the copper plating tank. The fasteners facilitate the engagement of the mounting plate 100 with the wall of the copper plating tank, providing initial positioning. Furthermore, the fixing bolts 102 further reinforce the connection between the mounting plate 100 and the copper plating tank, ensuring the entire device is securely installed on the copper plating tank and guaranteeing the stability of the equipment during operation.

[0041] A controller 200 and a placement rod 201 are fixedly mounted on the front surface of the mounting plate 100. A wire 202 is placed on the surface of the placement rod 201. One end of the wire 202 is connected to the signal input terminal of the controller 200, and the other end is connected to a sulfuric acid meter 203. The electric actuator 402 and the solenoid valve 300 are all controlled by the controller 200. The signal output terminal of the flow meter 301 is connected to the signal input terminal of the controller 200 via a cable. Through the controller 200, the operation of the electric actuator 402 and the solenoid valve 300 can be controlled according to set parameters to achieve automated solution dispensing. Furthermore, the sulfuric acid meter 203 monitors the sulfuric acid concentration in the copper plating tank in real time and feeds the data back to the controller 200. The controller 200 automatically adjusts the amount of sulfuric acid added based on the feedback data and the standard concentration, ensuring the stability and accuracy of the sulfuric acid concentration in the copper plating tank. Simultaneously, the placement rod 201 facilitates the organization and placement of the wire 202, preventing the wire 202 from becoming tangled and affecting the normal operation of the equipment.

[0042] The controller 200 can be a TMS320F2812. The sulfuric acid meter 203 is a well-known technical means in the art. For its specific structure and working principle, please refer to the sulfuric acid concentration meter in a copper plating device for welding wire with publication number CN222250977U. Other details will not be elaborated here.

[0043] In this embodiment of the invention, the mounting plate 100 is first attached to the upper wall of the copper plating tank via the slot 101. Then, the fixing bolts 102 are tightened to fix the mounting plate 100. Sufficient sulfuric acid is injected into the storage tank 104 to ensure that the storage tank 104 is well sealed, providing raw materials for subsequent liquid preparation. According to the copper plating process requirements, the controller 200 sets relevant parameters such as the amount of sulfuric acid added. The controller 200 controls the operation of the equipment based on these parameters. The controller 200 issues a command to open the solenoid valve 300 and controls the extension and retraction of the electric push rod 402, thereby driving the piston disc 403 to move outward. As a result, sulfuric acid flows from the bottom of the storage tank 104 through the solenoid valve 300, the flow meter 301, and the input pipe 302 into the piston cylinder 400. The flow meter 301 monitors the sulfuric acid flow rate in real time and feeds the data back to the controller 200. When the amount of sulfuric acid flowing into the piston cylinder 400 reaches the set value, the controller 200 controls the solenoid valve 300 to close.

[0044] The sliding disc 505 in the sealing assembly moves to one side under the push of the spring 506, and then drives the sealing column 503 to move along the inner cavity of the circular housing 404 via the connecting rod 504, thereby sealing the opening of the output pipe 405 and preventing sulfuric acid from flowing out before the designated time.

[0045] The controller 200 controls the electric push rod 402 to start. The telescopic end of the electric push rod 402 pushes the piston disc 403. The piston disc 403 slides inside the piston cylinder 400, squeezing the sulfuric acid inside the piston cylinder 400 towards the circular shell 404. At this time, under the action of sulfuric acid pressure, the sealing column 503 overcomes the elastic force of the spring 506, causing the outlet pipe 405 to open. The sulfuric acid flows into the copper plating tank through the outlet pipe 405.

[0046] The sulfuric acid meter 203 monitors the sulfuric acid concentration in the copper plating bath in real time and feeds the data back to the controller 200 through the wire 202. The controller 200 compares the received concentration data with the set standard concentration. If the concentration is lower than the standard value, sulfuric acid is added. If the concentration reaches or exceeds the standard value, the addition is stopped.

[0047] In summary, this embodiment of the invention achieves the extraction and injection of sulfuric acid through the sliding of the piston disc 403, which can precisely control the amount of sulfuric acid delivered. At the same time, the sealing ring 406 prevents the piston disc 403 from directly contacting the inner wall of the piston cylinder 400, which helps to reduce friction and wear between the two, thereby reducing wear. It also ensures the sealing of the piston cylinder 400, prevents sulfuric acid leakage, and provides a guarantee for ensuring the quantitative accuracy of sulfuric acid.

[0048] The foregoing has shown and described the basic principles of the present invention. The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. The above embodiments and descriptions in the specification are only illustrative of the principles of the present invention. Any modifications, equivalent substitutions, and improvements made within the scope of the present invention without departing from the scope of the present invention should be included within the protection scope of the present invention.

Claims

1. An automatic sulfuric acid dispensing device for single-ended copper-plated welding wire, comprising a mounting plate (100), characterized in that: A storage tank (104) for storing sulfuric acid is provided on the upper side of one side of the mounting plate (100). A bracket (105) is provided on the lower side of one side of the mounting plate (100) and below the storage tank (104). A piston cylinder (400) is fixedly installed on the top of the bracket (105). The bottom of the storage tank (104) is connected to the inner cavity of the piston cylinder (400) through an output assembly. A piston disc (403) is slidably connected to the inner cavity of the piston cylinder (400). 03) The outer circular surface is fitted with a sealing ring (406) to prevent the piston disc (403) from directly contacting the inner wall of the piston cylinder (400). The end of the piston cylinder (400) is connected to the copper plating tank through a connecting component. The opening of the piston cylinder (400) is provided with a pusher that pushes the piston disc (403) inward so that the sulfuric acid extracted from the piston cylinder (400) enters the copper plating tank through the connecting component. The upper part of the mounting plate (100) is fixedly installed on the wall of the copper plating tank by a fixing component.

2. The automatic sulfuric acid dispensing device for single-ended copper-plated welding wire according to claim 1, characterized in that: The output component includes a solenoid valve (300) connected to the bottom of one side of the storage tank (104), the output end of the solenoid valve (300) is connected to a flow meter (301), the output end of the flow meter (301) is connected to an input pipe (302), and the end of the input pipe (302) is connected to the upper side of the end of the piston cylinder (400).

3. The automatic sulfuric acid dispensing device for single-ended copper-plated welding wire according to claim 2, characterized in that: The communication assembly includes a circular housing (404) connected to the center of the end of the piston cylinder (400). One bottom side of the circular housing (404) is connected to an output pipe (405), and the other end of the output pipe (405) is connected to the inner cavity of the copper plating tank. The end of the circular housing (404) is connected to an installation cylinder (502) via a detachable connector. The inner cavity of the installation cylinder (502) is provided with a sealing assembly that seals the opening of the output pipe (405) when the piston cylinder (400) draws sulfuric acid. The detachable connector includes an internal thread (500) on the end surface of the circular housing (404), and a threaded ring (501) is threadedly connected to the end of the circular housing (404) through the internal thread (500). The threaded ring (501) is fixedly sleeved on the end of the mounting cylinder (502).

4. The automatic sulfuric acid dispensing device for single-ended copper-plated welding wire according to claim 3, characterized in that: The sealing assembly includes a sealing post (503) disposed inside a circular housing (404). A connecting rod (504) is fixedly connected to one end of the sealing post (503) near the mounting cylinder (502). The end of the connecting rod (504) penetrates the circular housing (404) and extends into the mounting cylinder (502). A sliding disc (505) is fixedly connected to the end of the connecting rod (504) inside the mounting cylinder (502). A spring (506) is disposed at the other end of the sliding disc (505). The other end of the spring (506) contacts the inner cavity of the mounting cylinder (502).

5. The automatic sulfuric acid dispensing device for single-ended copper-plated welding wire according to claim 4, characterized in that: The pusher includes a fixed plate (401) fixedly installed at the opening of the piston cylinder (400), and an electric push rod (402) is fixedly installed on the outer surface of the fixed plate (401). The telescopic end of the electric push rod (402) extends into the inner cavity of the piston cylinder (400) and is fixedly connected to the end of the piston disc (403).

6. The automatic sulfuric acid dispensing device for single-ended copper-plated welding wire according to claim 5, characterized in that: The fastener includes a fixing bolt (102) threaded to the upper part of the mounting plate (100), the mounting plate (100) being arranged in a figure-7 shape and the upper end being bent downward to form a slot (101) for engaging with the wall of the copper plating tank.

7. An automatic sulfuric acid dispensing device for single-ended copper-plated welding wire according to claim 5 or 6, characterized in that: The front surface of the mounting plate (100) is fixedly mounted with a controller (200) and a placement rod (201). A wire (202) is placed on the surface of the placement rod (201). One end of the wire (202) is connected to the signal input terminal of the controller (200), and the other end of the wire (202) is connected to a sulfuric acid meter (203). The electric push rod (402) and the solenoid valve (300) are both controlled by the controller (200). The signal output terminal of the flow meter (301) is connected to the signal input of the controller (200) through a cable.

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