Multistage purification treatment device for electroplating waste gas

Abstract

The invention relates to the technical field of waste gas treatment, and discloses an electroplating waste gas multistage purification treatment device which comprises a treatment tank, a gas storage tank and a liquid storage tank, a piston is arranged in the treatment tank in a sleeved mode, a support body is arranged at an upper tank opening of the treatment tank, and a driving element for driving the piston to move in the treatment tank is arranged on the support body. A bottom hole is formed in the lower tank bottom of the treatment tank, a bottom pipe extends from a lower hole opening of the bottom hole, the bottom pipe is connected with the liquid storage tank, a liquid discharging pipe is connected to the outer surface of the bottom pipe, a fifth valve and a one-way valve are arranged on the liquid discharging pipe, and a motor is arranged at the bottom of the bottom pipe; a connecting shaft is coaxially mounted in the bottom pipe and is in power connection with the motor, a fan is arranged at the upper end of the connecting shaft, an ultrasonic nebulizer is further arranged at the bottom of the treatment tank, and the upper end of the ultrasonic nebulizer is lower than the fan.

Description

Technical Field

[0001] The present invention relates to the technical field of waste gas treatment, and in particular to a multi-stage purification treatment device for electroplating waste gas. Background Art

[0002] The spraying method is one of the ways to purify electroplating waste gas. It uses spraying media, such as water, acidic solution, alkaline solution, etc., to spray the waste gas to dissolve the harmful components in the waste gas.

[0003] A search based on the spray treatment of electroplating waste gas was conducted, and a Chinese utility model patent with an authorization announcement number of CN221287312U was found, which discloses an electroplating waste gas treatment device, including an air inlet pipe, a one-way mechanism, a water outlet pipe, a fixing frame, a water inlet pipe, a transverse pipe, a nozzle, a vertical rod and an air outlet mechanism. One end of the air inlet pipe is connected to the lower end of the spray tank, and the other end of the air inlet pipe is connected to the one-way mechanism. The water outlet pipe is connected to the center position of the lower end of the spray tank. When spraying, spray water is introduced into the transverse pipe through the water inlet pipe, and then the spray water is sprayed through multiple nozzles. The spray water can be effectively absorbed by the two-layer nozzles, thereby improving the effect of waste gas treatment and ensuring the effect of use. Although it can make the spray medium and the waste gas fully contact, thereby improving the waste gas treatment efficiency and effect, it only starts from the contact angle and does not take into account the solubility of the spray medium. Therefore, its waste gas treatment efficiency and effect need to be further improved and improved. Based on this, the present invention proposes a multi-stage purification treatment device for electroplating waste gas. Summary of the invention

[0004] In order to solve the problems mentioned in the above background, the present invention provides a multi-stage purification treatment device for electroplating waste gas.

[0005] In order to achieve the above technical objectives, the technical solution adopted by the present invention is as follows.

[0006] The electroplating waste gas multi-stage purification treatment device comprises a treatment tank, a gas storage tank and a liquid storage tank, wherein the gas storage tank is used to store the electroplating waste gas to be treated, and the liquid storage tank stores a liquid medium for treating the waste gas;

[0007] A piston is sleeved in the processing tank, a bracket body is arranged at the upper tank opening of the processing tank, a driving element is arranged on the bracket body, and the driving element is used to drive the piston to move in the processing tank. A connecting hole is arranged through the end surface of the piston, and the connecting hole is connected with the gas storage tank;

[0008] A bottom hole is provided at the bottom of the lower tank of the treatment tank, a bottom pipe extends from the lower opening of the bottom hole, the bottom of the bottom pipe is closed, the bottom pipe is connected to the liquid storage tank, and a drain pipe is also connected to the outer surface of the bottom pipe. A valve 5 and a one-way valve are provided on the drain pipe. The one-way valve is used to allow the fluid in the treatment tank to flow outward in one direction through the drain pipe;

[0009] A motor is arranged at the bottom of the bottom tube, a connecting shaft is coaxially installed inside the bottom tube, a power connection is formed between the connecting shaft and the motor, a fan is arranged at the upper end of the connecting shaft, and an ultrasonic atomizer is also arranged at the bottom of the treatment tank, and the upper end height of the ultrasonic atomizer is lower than the height of the fan.

[0010] As a further improvement and optimization of the present invention, a side nozzle is arranged on the outer circumferential surface of the processing tank, an exhaust pipe is connected to the end of the side nozzle, and a valve six is ​​arranged on the exhaust pipe.

[0011] As a further improvement and optimization of the present invention, the air inlet end of the air storage tank is connected to an air inlet pipe and a valve 1 is provided on the air inlet pipe, the air outlet end of the air storage tank is connected to an air supply pipe, the end of the air supply pipe is connected to the air inlet end of the treatment tank and a valve 2 is provided on the air supply pipe.

[0012] As a further improvement and optimization of the present invention, an annular tube is installed above the piston, an upper connecting tube is provided on the upper end surface of the annular tube, the end of the upper connecting tube is connected to the air supply pipe, and a lower connecting tube is provided on the lower end surface of the annular tube, the end of the lower connecting tube is connected to the upper opening of the connecting hole.

[0013] As a further improvement and optimization of the present invention, several lower connecting pipes and connecting holes are arranged in an array along the circumferential direction of the piston, and multiple upper connecting pipes are arranged in an array along the circumferential direction of the piston. The upper connecting pipe is connected to the air supply pipe through a branch pipe, and multiple branch pipes are arranged accordingly.

[0014] As a further improvement and optimization of the present invention, the liquid inlet end of the liquid storage tank is connected to a liquid replenishing pipe and a valve three is provided on the liquid replenishing pipe, the liquid outlet end of the liquid storage tank is connected to a liquid delivery pipe and a valve four is provided on the liquid delivery pipe, and the liquid delivery pipe is connected to the bottom pipe.

[0015] As a further improvement and optimization of the present invention, the bottom height of the liquid storage tank is higher than the bottom height of the processing tank.

[0016] As a further improvement and optimization of the present invention, a sealing unit is provided in the connecting hole;

[0017] The connecting hole consists of a lower tapered hole and an upper thin hole. The sealing unit includes a valve stem sleeved in the upper thin hole. The upper end of the valve stem extends into the lower connecting pipe and is provided with a limit ring. The outer sleeve of the valve stem is provided with a spring located between the limit ring and the upper end surface of the piston. The lower end of the valve stem extends into the lower tapered hole and is provided with a valve plug. The cross-sectional diameter of the lower tapered hole decreases from bottom to top in the vertical direction. The valve plug is in the shape of a cone. Initially, under the action of the spring force, the outer surface of the valve plug fits against the hole wall of the lower tapered hole to block the lower tapered hole.

[0018] As a further improvement and optimization of the present invention, a protrusion extends from the middle position of the lower end surface of the piston, the bottom of the protrusion is set to a hemispherical shape, the connection between the protrusion and the piston is rounded and formed with an arc surface, and the wind force generated when the fan rotates blows from bottom to top.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present application improves the spraying method for treating waste gas, by contacting the atomized liquid medium with the waste gas, increasing the pressure of the treatment environment to improve the efficiency and effect of the dissolution reaction, and further improving the treatment efficiency and effect by pulling the atomized liquid medium to flow. In this way, the multi-stage purification treatment methods cooperate with each other to achieve the purification treatment of electroplating waste gas, and the purification effect and efficiency can be significantly improved. Specifically:

[0021] 1. In a positive pressure environment, the dissolution reaction between the liquid medium and the electroplating waste gas can be accelerated, and the purification of the electroplating waste gas can be achieved more quickly;

[0022] At the same time, the motor drives the connecting shaft to rotate, thereby driving the fan to rotate. The rotation of the fan can pull the nearby air to flow upward, and then guide it along the spherical surface at the bottom of the protrusion and the arc surface at the connection between the protrusion and the piston, and flow toward the wall of the treatment tank, and then flow downward along the tank wall of the treatment tank, and so on and so forth, forming a unidirectional airflow. The unidirectional airflow can, on the one hand, play a stirring role, so that the electroplating waste gas and the liquid medium are fully and evenly contacted, and on the other hand, it can pull the atomized liquid medium to contact with the liquid liquid medium below, so that the atomized liquid medium returns to the liquid liquid medium below, and the newly generated atomized liquid medium is pulled by the airflow and contacts with the electroplating waste gas, and so on and so forth, so that the atomized liquid medium that has dissolved and reacted enough harmful components of the waste gas can be returned, and the new atomized liquid medium can take over to participate in the waste gas purification process, and in this way, the purification effect and purification efficiency can be greatly improved;

[0023] 2. The sealing unit is arranged in the connecting hole. On the one hand, when the electroplating waste gas enters the treatment tank, the sealing unit is equivalent to a one-way valve structure, which does not affect the inflow of the electroplating waste gas and can prevent backflow. In the subsequent electroplating waste gas purification process, the connecting hole can be blocked, so that the electroplating waste gas between the connecting hole and the air supply pipe does not participate in the current purification process, but participates in the next purification process. Therefore, there will be no problem of incomplete waste gas purification. On the other hand, during the purification process of the electroplating waste gas, as the pressure in the treatment tank increases, the pressure on the valve plug also increases, the fit between the valve plug and the lower cone hole becomes tighter, and the sealing performance between the two is better, so that the purification process of the electroplating waste gas proceeds smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the present invention;

[0025] Figure 2 is a schematic diagram of a gas storage tank;

[0026] Figure 3 is a schematic diagram of a treatment tank;

[0027] Figure 4 is a cross-sectional view of a treatment tank;

[0028] Figure 5 is a cross-sectional view of the piston;

[0029] Figure 6 Schematic diagram of the tank bottom of the treatment tank.

[0030] The reference numerals in the accompanying drawings are:

[0031] 100. Treatment tank; 101. Bottom pipe; 102. Drain pipe; 103. Side nozzle; 104. Exhaust pipe; 105. Driving element; 106. Motor; 107. Connecting shaft; 108. Fan; 109. Ultrasonic atomizer; 110. Piston; 111. Ring pipe; 112. Upper connecting pipe; 113. Lower connecting pipe; 114. Valve plug; 115. Valve stem; 116. Spring; 200. Gas storage tank; 201. Inlet pipe; 202. Air delivery pipe; 203. Branch pipe; 300. Liquid storage tank; 301. Liquid replenishment pipe; 302. Liquid delivery pipe. DETAILED DESCRIPTION

[0032] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0033] Reference Figure 1-Figure 6 The multi-stage purification treatment device for electroplating waste gas comprises a treatment tank 100, a gas storage tank 200 and a liquid storage tank 300, wherein:

[0034] The gas storage tank 200 is used to store the electroplating waste gas to be treated. Furthermore, the air inlet end of the gas storage tank 200 is connected to the air inlet pipe 201 and the air inlet pipe 201 is provided with a valve 1, and the air outlet end of the gas storage tank 200 is connected to the air supply pipe 202, the end of the air supply pipe 202 is connected to the air inlet end of the treatment tank 100 and the air supply pipe 202 is provided with a valve 2; the valve 1 is opened, the valve 2 is closed, and the electroplating waste gas is drawn into the gas storage tank 200 through the air inlet pipe 201 through the existing technology, such as a compressor or a blower, and stored. During purification treatment, the valve 1 is closed, the valve 2 is opened, and the electroplating waste gas flows to the treatment tank 100 through the air supply pipe 202. It should be noted that the valve 1, the valve 2 and the valves mentioned later are all existing technologies, such as the solenoid valve technology, and will not be described in detail;

[0035] The liquid storage tank 300 stores a liquid medium, and the liquid medium serves as a dissolving medium for treating electroplating waste gas. Furthermore, the liquid inlet end of the liquid storage tank 300 is connected to a liquid replenishing pipe 301 and a valve three is provided on the liquid replenishing pipe 301, and the liquid outlet end of the liquid storage tank 300 is connected to a liquid delivery pipe 302 and a valve four is provided on the liquid delivery pipe 302, and the end of the liquid delivery pipe 302 is connected to the liquid inlet end of the treatment tank 100; valve three is opened, and valve four is closed, and the liquid medium is drawn into the liquid storage tank 300 through the liquid replenishing pipe 301 through existing technologies, such as a water pump, and stored. During purification treatment, valve three is closed and valve four is opened. Since the bottom height of the liquid storage tank 300 is higher than the bottom height of the treatment tank 100, the liquid medium in the liquid storage tank 300 can flow into the treatment tank 100 through the liquid delivery pipe 302.

[0036] Reference Figure 3-Figure 6 A piston 110 is sleeved in the processing tank 100, a bracket body is provided at the upper tank mouth of the processing tank 100, and a driving element 105 is provided on the bracket body. The driving element 105 is used to drive the piston 110 to move in the processing tank 100. The existing hydraulic rod technology or the existing electric telescopic rod technology can be used, and the hydraulic rod technology is preferred.

[0037] An annular tube 111 is installed above the piston 110, and an upper connecting tube 112 is provided on the upper end face of the annular tube 111, and the end of the upper connecting tube 112 is connected to the air supply pipe 202, and a lower connecting tube 113 is provided on the lower end face of the annular tube 111. A connecting hole is penetrated through the end face of the piston 110, and the end of the lower connecting tube 113 is connected to the upper orifice of the connecting hole; the electroplating waste gas flows into the treatment tank 100 through the air supply pipe 202, the upper connecting tube 112, the annular tube 111, the lower connecting tube 113 and the connecting hole.

[0038] In a preferred embodiment, in order to make the electroplating waste gas flow into the treatment tank 100 more evenly, that is, to be more evenly distributed in the treatment tank 100, a plurality of lower connecting pipes 113 and connecting holes are arranged in an array along the circumferential direction of the piston 110, and a plurality of upper connecting pipes 112 are also arranged in an array along the circumferential direction of the piston 110. The upper connecting pipe 112 is connected to the air supply pipe 202 via a branch pipe 203, and a plurality of branch pipes 203 are correspondingly arranged, two of which are shown in the attached figure of this scheme.

[0039] A bottom hole is provided at the bottom of the lower tank of the processing tank 100, and a bottom pipe 101 extends from the lower hole mouth of the bottom hole. The bottom of the bottom pipe 101 is closed, and the liquid supply pipe 302 is connected to the bottom pipe 101. The outer surface of the bottom pipe 101 is also connected to the drain pipe 102. The drain pipe 102 is provided with a valve 5 and a one-way valve. The one-way valve is used to allow the fluid in the processing tank 100 to flow outward in one direction through the drain pipe 102. The one-way valve can be realized by existing technology and will not be described in detail.

[0040] A motor 106 is arranged at the bottom of the bottom tube 101, and a connecting shaft 107 is coaxially installed inside the bottom tube 101. A power connection is formed between the connecting shaft 107 and the motor 106. A fan 108 is arranged at the upper end of the connecting shaft 107. An ultrasonic atomizer 109 is also arranged at the bottom of the treatment tank 100, and the upper end height of the ultrasonic atomizer 109 is lower than the height of the fan 108.

[0041] Reference Figure 3 and Figure 4 The outer circumferential surface of the processing tank 100 is provided with a side nozzle 103, the end of the side nozzle 103 is connected to an exhaust pipe 104, and the exhaust pipe 104 is provided with a valve six.

[0042] Working principle of the present invention:

[0043] Valve 3 is closed and valve 4 is opened. Since the bottom height of the liquid storage tank 300 is higher than the bottom height of the processing tank 100, the liquid medium in the liquid storage tank 300 can flow into the processing tank 100 through the liquid delivery pipe 302. When the liquid level in the processing tank 100 is between the upper end of the ultrasonic atomizer 109 and the fan 108, valves 3 and 4 are both closed.

[0044] Then, valve 1 is closed, valve 2 is opened, and electroplating waste gas flows into the treatment tank 100 through the gas supply pipe 202, the upper connecting pipe 112, the ring pipe 111, the lower connecting pipe 113 and the connecting hole. When the treatment tank 100 is filled with electroplating waste gas, valve 1 and valve 2 are both closed.

[0045] Then, the piston 110 is driven downward by the driving element 105 to increase the internal air pressure of the treatment tank 100, and the ultrasonic atomizer 109 is started to atomize the liquid medium and contact the electroplating waste gas. Since the solubility of the liquid medium increases with the increase of pressure, the dissolution reaction between the liquid medium and the electroplating waste gas can be accelerated in a positive pressure environment, and the electroplating waste gas can be purified more quickly. At the same time, the motor 106 drives the connecting shaft 107 to rotate, thereby driving the fan 108 to rotate, which plays a stirring action, so that the contact between the electroplating waste gas and the liquid medium is faster and more sufficient, and the processing efficiency and processing effect are further improved;

[0046] After the preset time, the purification is completed, the motor 106 stops running, the valve five is opened, and the driving element 105 drives the piston 110 to move downward, thereby pushing out the liquid medium that has dissolved the harmful components of the exhaust gas. Then, the valve five is closed, the driving element 105 drives the piston 110 to move upward, and the valve six is ​​opened at the same time. When the piston 110 is higher than the side nozzle 103, the purified exhaust gas is discharged through the side nozzle 103 and the exhaust pipe 104.

[0047] In the preferred embodiment, during the purification process of electroplating waste gas, part of the waste gas is located in the ring pipe 111, the branch pipe 203 and the part of the air supply pipe 202 between the valve 2 and the branch pipe 203. This part of the waste gas is difficult to be purified. At the same time, the positive pressure environment will be transmitted to the valve 2, and the pressure on the valve 2 is relatively large. Over a long period of time, it is easy to affect the sealing of the valve 2. In order to solve this problem, refer to Figure 4 and Figure 5 , a sealing unit is provided in the connecting hole.

[0048] Specifically, the connecting hole is composed of a lower tapered hole and an upper fine hole, and the sealing unit includes a valve stem 115 sleeved in the upper fine hole, the upper end of the valve stem 115 extends into the lower connecting pipe 113 and is provided with a limit ring, the outer sleeve of the valve stem 115 is provided with a spring 116 located between the limit ring and the upper end surface of the piston 110, the lower end of the valve stem 115 extends into the lower tapered hole and is provided with a valve plug 114, the cross-sectional diameter of the lower tapered hole decreases from bottom to top along the vertical direction, and the valve plug 114 is in a cone shape. Initially, under the elastic force of the spring 116, the outer surface of the valve plug 114 fits with the hole wall of the lower tapered hole, thereby blocking the lower tapered hole; the advantage of this is that the electroplating waste gas enters the treatment tank 100 During the process, the sealing unit is equivalent to a one-way valve structure, which does not affect the inflow of the electroplating waste gas and can prevent backflow. In the subsequent electroplating waste gas purification process, the connecting hole can be blocked, so that the electroplating waste gas located between the connecting hole and the air supply pipe 202 does not participate in this purification process, but participates in the next purification process. Therefore, there will be no problem of incomplete waste gas purification. In addition, during the purification process of the electroplating waste gas, as the pressure in the treatment tank 100 increases, the pressure on the valve plug 114 also increases, the fit between the valve plug 114 and the lower cone hole is tighter, and the sealing performance between the two is better, so that the purification process of the electroplating waste gas proceeds smoothly.

[0049] Preferred embodiment, refer to Figure 4A protrusion extends from the middle position of the lower end surface of the piston 110, and the bottom of the protrusion is set to a hemispherical shape. The connection between the protrusion and the piston 110 is rounded and formed with an arc surface. The wind force generated by the rotation of the fan 108 blows from bottom to top; the advantage of this is that during the electroplating waste gas purification process, the fan 108 rotates, which can pull the nearby air to flow upward, and then guide it along the spherical surface of the bottom of the protrusion and the arc surface of the connection between the protrusion and the piston 110, and flow toward the wall of the processing tank 100, and then flow downward along the wall of the processing tank 100, and so on and so forth, forming a unidirectional flow. The unidirectional airflow can, on the one hand, play a stirring role, so that the electroplating waste gas and the liquid medium are fully and evenly contacted. On the other hand, it can pull the atomized liquid medium into contact with the liquid liquid medium below, so that the atomized liquid medium returns to the liquid liquid medium below, and the newly generated atomized liquid medium is pulled by the airflow and contacts with the electroplating waste gas. This process is repeated, so that the atomized liquid medium that has dissolved enough harmful components in the waste gas can be returned, and the new atomized liquid medium can take over the waste gas purification process. In this way, the purification effect and efficiency can be greatly improved.

[0050] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A multi-stage purification treatment device for electroplating waste gas, comprising a treatment tank (100), a gas storage tank (200) and a liquid storage tank (300), characterized in that: The gas storage tank (200) is used to store electroplating waste gas to be treated, and the liquid storage tank (300) stores a liquid medium for treating the waste gas; A piston (110) is sleeved in the processing tank (100), a bracket body is arranged at the upper tank opening of the processing tank (100), a driving element (105) is arranged on the bracket body, and the driving element (105) is used to drive the piston (110) to move in the processing tank (100), and a connecting hole is arranged through the end surface of the piston (110), and the connecting hole is communicated with the gas storage tank (200); A bottom hole is provided at the bottom of the lower tank of the treatment tank (100), a bottom pipe (101) extends from the lower opening of the bottom hole, the bottom of the bottom pipe (101) is closed, the bottom pipe (101) is connected to the liquid storage tank (300), and a drain pipe (102) is also connected to the outer surface of the bottom pipe (101), a valve 5 and a one-way valve are provided on the drain pipe (102), and the one-way valve is used to allow the fluid in the treatment tank (100) to flow outward in one direction through the drain pipe (102); A motor (106) is arranged at the bottom of the bottom tube (101), a connecting shaft (107) is coaxially installed inside the bottom tube (101), a power connection is formed between the connecting shaft (107) and the motor (106), a fan (108) is arranged at the upper end of the connecting shaft (107), and an ultrasonic atomizer (109) is also arranged at the bottom of the treatment tank (100), and the height of the upper end of the ultrasonic atomizer (109) is lower than the height of the fan (108).

2. The multi-stage purification device for electroplating waste gas according to claim 1 is characterized in that: The outer circumferential surface of the treatment tank (100) is provided with a side nozzle (103), the end of the side nozzle (103) is connected to an exhaust pipe (104), and a valve six is ​​provided on the exhaust pipe (104).

3. The multi-stage purification treatment device for electroplating waste gas according to claim 1 is characterized in that: The air inlet end of the air storage tank (200) is connected to an air inlet pipe (201) and a valve 1 is provided on the air inlet pipe (201); the air outlet end of the air storage tank (200) is connected to an air supply pipe (202); the end of the air supply pipe (202) is connected to the air inlet end of the processing tank (100) and a valve 2 is provided on the air supply pipe (202).

4. The multi-stage purification treatment device for electroplating waste gas according to claim 3 is characterized in that: An annular tube (111) is installed above the piston (110), an upper connecting tube (112) is arranged on the upper end surface of the annular tube (111), the end of the upper connecting tube (112) is connected to the air supply pipe (202), and a lower connecting tube (113) is arranged on the lower end surface of the annular tube (111), the end of the lower connecting tube (113) is connected to the upper opening of the connecting hole.

5. The multi-stage purification treatment device for electroplating waste gas according to claim 4 is characterized in that: A plurality of lower connecting pipes (113) and connecting holes are arranged in an array along the circumferential direction of the piston (110); a plurality of upper connecting pipes (112) are arranged in an array along the circumferential direction of the piston (110); the upper connecting pipe (112) and the air supply pipe (202) are connected via a branch pipe (203), and a plurality of branch pipes (203) are arranged accordingly.

6. The multi-stage purification treatment device for electroplating waste gas according to claim 1 is characterized in that: The liquid inlet end of the liquid storage tank (300) is connected to a liquid replenishing pipe (301) and a valve three is provided on the liquid replenishing pipe (301); the liquid outlet end of the liquid storage tank (300) is connected to a liquid delivery pipe (302) and a valve four is provided on the liquid delivery pipe (302); the liquid delivery pipe (302) is connected to the bottom pipe (101).

7. The multi-stage purification treatment device for electroplating waste gas according to claim 6 is characterized in that: The bottom height of the liquid storage tank (300) is higher than the bottom height of the processing tank (100).

8. The multi-stage purification device for electroplating waste gas according to claim 4 is characterized in that: A sealing unit is provided in the connecting hole; The connecting hole is composed of a lower conical hole and an upper fine hole. The sealing unit includes a valve stem (115) sleeved in the upper fine hole. The upper end of the valve stem (115) extends into the lower connecting pipe (113) and is provided with a limit ring. The outer sleeve of the valve stem (115) is provided with a spring (116) located between the limit ring and the upper end surface of the piston (110). The lower end of the valve stem (115) extends into the lower conical hole and is provided with a valve plug (114). The cross-sectional diameter of the lower conical hole decreases from bottom to top along the vertical direction. The valve plug (114) is in a cone shape. Initially, under the elastic force of the spring (116), the outer surface of the valve plug (114) fits against the hole wall of the lower conical hole to block the lower conical hole.

9. The multi-stage purification treatment device for electroplating waste gas according to claim 8 is characterized in that: A protrusion extends from the middle position of the lower end surface of the piston (110), and the bottom of the protrusion is set in a hemispherical shape. The connection between the protrusion and the piston (110) is rounded and forms an arc surface. The wind force generated by the rotation of the fan (108) blows from bottom to top.

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