Cadmium-containing industrial wastewater treatment device

Abstract

The utility model discloses a cadmium-containing industrial wastewater treatment device, which relates to the technical field of environmental protection equipment, and comprises three box covers, a treatment assembly is fixedly arranged below the three box covers, the front surface of the treatment assembly is fixedly connected with two sewage inlet pipes, the outer surfaces of the two sewage inlet pipes are fixedly connected with a control valve II, and the control valve II is fixedly connected with a control valve II. And the right side of the treatment assembly is fixedly connected with a sewage outlet pipe, and the outer surface of the front face of the sewage outlet pipe is fixedly connected with a suction pump. According to the cadmium-containing industrial wastewater treatment device disclosed by the utility model, a motor II fixedly connected with the front part and the rear part of the lower part of a driving rod is used for providing power to drive a gear to rotate and be meshed with a gear block, so that the driving rod is driven to move up and down in an inner cavity of a fixed box and move up and down on three fixedly connected mounting frames on opposite surfaces of the driving rod; and therefore, brush rods fixedly connected with the bottoms of the three mounting frames are driven to play a role in cleaning stains on the surfaces of the nanofiber membrane and the composite nanofiber membrane, and the filtering effect is prevented from being reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of environmental protection equipment, in particular to a cadmium-containing industrial wastewater treatment device. Background Art

[0002] Cadmium is used as a raw material or catalyst to produce batteries, plastics, pigments and reagents; it can also be used as a raw material for the production of stainless steel, alloys, television screens, etc.; in addition, cadmium is one of the materials for control rods for nuclear reactors. The widespread use of cadmium has caused its environmental pollution. Cadmium pollution first pollutes soil and water bodies. Cadmium-containing wastewater mainly includes: wastewater generated by mining and smelting of cadmium-containing mines, cadmium compound industrial wastewater, nickel-cadmium battery production wastewater and electroplating cadmium-containing wastewater. Cadmium is harmful to the human body. It can accumulate in the human body through the food chain, or directly act on the human body to cause acute and chronic cadmium poisoning. Acute cadmium poisoning is mainly manifested by fever, cough, fatigue, chest tightness, limb soreness, etc.; chronic cadmium poisoning is mainly manifested by increased urinary cadmium. If the disease continues to develop, it will cause kidney, liver and lung damage, accompanied by osteoporosis and osteomalacia. Cadmium poisoning has occurred in polluted areas in my country and Japan. The harm of cadmium to the human body has attracted the attention of countries around the world, and all countries have formulated corresponding national standards.

[0003] For example, the Chinese patent with publication number CN203474568U discloses a cadmium-containing industrial wastewater treatment device. It only solves the problem of low treatment cost and low secondary pollution of the cadmium-containing industrial wastewater treatment device. However, it does not solve the problem that the cadmium-containing industrial wastewater treatment device has a single treatment method, thereby reducing the treatment of cadmium in wastewater.

[0004] The existing technology has the following problems:

[0005] However, the problem of the single treatment method of cadmium-containing industrial wastewater treatment equipment has not been solved, which reduces the treatment of cadmium in wastewater. At the same time, when using membrane separation technology to remove cadmium in wastewater, stains will remain on the surface of the membrane, thereby reducing the filtration effect. Utility Model Content

[0006] The utility model provides a cadmium-containing industrial wastewater treatment device to solve the problems raised in the above background technology.

[0007] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0008] A cadmium-containing industrial wastewater treatment device comprises three box covers, treatment components are fixedly installed under the three box covers, two sewage inlet pipes are fixedly connected to the front of the treatment component, the outer surfaces of the two sewage inlet pipes are fixedly connected to control valve 2, the right side of the treatment component is fixedly connected to a sewage outlet pipe, the front outer surface of the sewage outlet pipe is fixedly connected to a pump, the left and right sides of the treatment component are fixedly connected to the back, and a precipitant tube is fixedly connected to the top left side of the front box cover.

[0009] Preferably: the processing component includes a processing box, the inner cavity of the processing box is provided with a collecting tank, the front of the processing box is fixedly connected to the outer surface of two control valves 2, the rear bottom of the processing box is fixedly connected to a drain pipe, the outer surface of the drain pipe is fixedly connected to a control valve 3, the inner cavity of the processing box is provided with a sedimentation component and the sedimentation component is located behind the collecting tank, the inner cavity of the processing box is provided with an electrolysis component and the electrolysis component is located behind the sedimentation component, the inner cavity of the processing box is provided with a membrane separation component and the membrane separation component is located behind the electrolysis component.

[0010] Preferably: the inner cavity of the treatment box is provided with a secondary sedimentation tank and the secondary sedimentation tank is located behind the membrane separation component, the inner cavity of the treatment box is provided with an external discharge tank and the external discharge tank is located behind the secondary sedimentation tank, and the back of the external discharge tank is fixedly connected to the front end of the drain pipe.

[0011] Preferably: the right bottom of the collecting tank, sedimentation assembly, electrolysis assembly and secondary sedimentation tank are all fixedly connected with a sewage pipe, the outer surfaces of the four sewage pipes are fixedly connected with a control valve 1, and the right side of the control valve 1 is fixedly connected with a sewage outlet pipe.

[0012] Preferably: the sedimentation assembly comprises a sedimentation tank, the inner wall of the sedimentation tank is provided with discharge ports at the front and rear, a pH detector is arranged on the inner cavity side of the sedimentation tank, and the upper bottom end of the pH detector is fixedly mounted on the top of the box cover.

[0013] Preferably: a motor 1 is fixedly installed on the top of the front of the three box covers and is located above the sedimentation tank, a driving shaft is fixedly connected to the bottom of the motor 1 and is located in the inner cavity of the sedimentation tank, and four stirring blades are fixedly connected to the front and rear outer surfaces of the driving shaft.

[0014] Preferably: the electrolytic assembly includes an electrolytic cell, a rectifier is fixedly connected to the top of the front of the three box covers and the rectifier is located above the electrolytic cell, and the rectifier is located behind motor one, and an electrolytic rod is fixedly connected to the bottom of the rectifier and the electrolytic rod is located in the inner cavity of the electrolytic cell.

[0015] Preferably: the membrane separation component includes a filter box, a pH detector is fixedly connected to the top of the filter box and located in the middle of the three box covers, a nanofiber membrane is fixedly installed in the inner cavity of the filter box, a composite nanofiber membrane is fixedly installed in the inner cavity of the filter box and the composite nanofiber membrane is located in front of the nanofiber membrane.

[0016] Preferably, the power assembly comprises two fixed boxes and a driving rod, the opposite surfaces of the two fixed boxes are fixedly connected to the left and right sides of the processing box, and the front ends of the left and right sides of the inner walls of the fixed boxes are fixedly connected with gear blocks.

[0017] Preferably: the lower part of the driving rod is fixedly connected to motor 2 at the front and rear, the output end of motor 2 is fixedly connected to gears at the front and rear, the surface of the gear is meshed with the surfaces of two gear blocks, the upper opposite surfaces of the two driving rods are fixedly connected to mounting frames, the bottom of the mounting frames are fixedly connected to three brush rods, the front and rear opposite surfaces and the middle surfaces away from each other of the three brush rods overlap the front and rear surfaces of the nanofiber membrane and the composite nanofiber membrane.

[0018] Due to the adoption of the above technical solution, the utility model has achieved the following technical progress compared with the prior art:

[0019] 1. The utility model provides a cadmium-containing industrial wastewater treatment device, which has the function of feeding wastewater into a collection tank for sedimentation through two sewage inlet pipes, and then feeding wastewater into a sedimentation tank through a discharge port, thereby feeding a precipitant into the sedimentation tank through a precipitant pipe, and then using a pH detector to detect the pH value of the wastewater, and adjusting the pH to about ., so that the cadmium ions in the wastewater are in a state most suitable for chemical precipitation, and then using a motor to provide power to drive the stirring of a driving shaft and a stirring blade to accelerate the auxiliary mixing and precipitation of cadmium ions, thereby improving efficiency, and then using a rectifier to adjust the motor to use an electrolytic rod to electrolyze the wastewater in the inner cavity of the electrolytic cell to precipitate cadmium ions, and then using a pH detector to detect the wastewater in the inner cavity of the filter box through the wastewater that has been precipitated multiple times, and then using a nanofiber membrane and a composite nanofiber membrane to adsorb cadmium ions from the wastewater, and the cadmium ions after adsorption are eluted, thereby achieving a variety of ways to remove cadmium and improve efficiency.

[0020] 2. The utility model provides a cadmium-containing industrial wastewater treatment device, which provides power through a motor 2 fixedly connected to the front and rear of the lower part of the driving rod, driving the rotation of the gear and engaging with the tooth block, thereby driving the driving rod up and down in the inner cavity of the fixed box, and then driving the three fixedly connected mounting brackets on the opposite sides of the driving rod up and down, thereby driving the brush rod fixedly connected to the bottom of the three mounting brackets to clean the surface stains of the nanofiber membrane and the composite nanofiber membrane to prevent the filtration effect from being reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the utility model;

[0022] Figure 2 This is a schematic diagram of the structure of the processing component of the utility model;

[0023] Figure 3 It is a schematic diagram of the structure of the precipitation component and the electrolysis component of the utility model;

[0024] Figure 4 This is a schematic diagram of the structure of the membrane separation component of the utility model;

[0025] Figure 5 It is a schematic diagram of the enlarged structure of the power component of the utility model.

[0026] In the figure: 1, treatment component; 11, treatment box; 12, collection tank; 13, sedimentation component; 131, sedimentation tank; 132, outlet; 133, pH detector 1; 134, motor 1; 135, drive shaft; 136, stirring blade; 14, electrolysis component; 141, electrolysis cell; 142, rectifier; 143, electrolysis rod; 15, membrane separation component; 151, filter box; 152, pH detector 2; 153, nanofiber Membrane; 154, composite nanofiber membrane; 16, secondary sedimentation tank; 17, external discharge tank; 18, control valve one; 19, sewage pipe; 110, drainage pipe; 111, control valve three; 2, box cover; 3, sewage inlet pipe; 4, control valve two; 5, sewage outlet pipe; 6, pump; 7, power assembly; 71, fixing box; 72, gear block; 73, driving rod; 74, motor two; 75, gear; 76, mounting bracket; 77, brush rod; 8, precipitant tube. DETAILED DESCRIPTION

[0027] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0028] like Figure 1 As shown, a cadmium-containing industrial wastewater treatment device includes three box covers 2, a treatment component 1 is fixedly installed under the three box covers 2, two sewage inlet pipes 3 are fixedly connected to the front of the treatment component 1, the outer surfaces of the two sewage inlet pipes 3 are fixedly connected to the control valve 4, the right side of the treatment component 1 is fixedly connected to the sewage outlet pipe 5, the front outer surface of the sewage outlet pipe 5 is fixedly connected to the pump 6, the left and right sides of the treatment component 1 are fixedly connected to the back, and the top left side of the front box cover 2 is fixedly connected to the precipitant tube 8.

[0029] The processing assembly 1 assists the three box covers 2, the two sewage inlet pipes 3, and the sewage outlet pipe 5 to be stably installed at the predetermined positions. The control valve 2 4 controls the inlet and outlet of the sewage inlet pipe 3 and the pump 6 provides power to discharge sewage from the sewage outlet pipe 5. The precipitant pipe 8 fixedly connected to the left side of the top of the box cover 2 plays a role in supplying the precipitant into the sedimentation tank 131 to assist sedimentation.

[0030] like Figure 2 As shown, the treatment component 1 includes a treatment box 11, the inner cavity of the treatment box 11 is provided with a collection tank 12, the front of the treatment box 11 is fixedly connected to the outer surfaces of the two control valves 4, the bottom of the rear of the treatment box 11 is fixedly connected to a drain pipe 110, the outer surface of the drain pipe 110 is fixedly connected to a control valve 111, the inner cavity of the treatment box 11 is provided with a precipitation component 13 and the precipitation component 13 is located behind the collection tank 12, the inner cavity of the treatment box 11 is provided with an electrolytic component 14 and the electrolytic component 14 is located behind the precipitation component 13, the inner cavity of the treatment box 11 is provided with a membrane separation component 15 and the membrane separation component 16 is provided with a membrane separation component 17, and the membrane separation component 18 is provided with a membrane separation component 19. The membrane separation component 15 is located behind the electrolytic component 14, the inner cavity of the treatment box 11 is provided with a secondary sedimentation tank 16 and the secondary sedimentation tank 16 is located behind the membrane separation component 15, the inner cavity of the treatment box 11 is provided with an external discharge tank 17 and the external discharge tank 17 is located behind the secondary sedimentation tank 16, the back of the external discharge tank 17 is fixedly connected to the front end of the drain pipe 110, the right bottom of the collecting tank 12, the sedimentation component 13, the electrolytic component 14 and the secondary sedimentation tank 16 are all fixedly connected to a sewage pipe 19, the outer surfaces of the four sewage pipes 19 are fixedly connected to a control valve 18, and the right side of the control valve 18 is fixedly connected to a sewage outlet pipe 5.

[0031] Cadmium is removed by precipitation in various ways through the collection tank 12, the sedimentation component 13, the electrolysis component 14 and the membrane separation component 15. The removed wastewater enters the secondary sedimentation tank 16 for sedimentation, and the sewage pipe 19 fixedly connected at the bottom is combined with the sewage outlet pipe 5, so that the control valve 18 can control the sewage discharge of the collection tank 12, the sedimentation component 13, the electrolysis component 14 and the secondary sedimentation tank 16 separately, and the treated wastewater is collected in the external discharge tank 17 and the control valve three 111 controls the discharge of the drain pipe 110.

[0032] like Figure 3 As shown, the sedimentation assembly 13 includes a sedimentation tank 131, and the inner wall of the sedimentation tank 131 is provided with a discharge port 132 at the front and rear. A pH detector 133 is provided on the inner cavity side of the sedimentation tank 131. The upper bottom end of the pH detector 133 is fixedly installed with the top of the box cover 2. A motor 134 is fixedly installed on the top of the front of the three box covers 2 and the motor 134 is located above the sedimentation tank 131. The bottom of the motor 134 is fixedly connected with a drive shaft 135 and the drive shaft 1 35 is located in the inner cavity of the sedimentation tank 131, and the outer surface of the driving shaft 135 is fixedly connected with four stirring blades 136 at the front and rear. The electrolytic assembly 14 includes an electrolytic cell 141. The top of the front of the three box covers 2 is fixedly connected with a rectifier 142 and the rectifier 142 is located above the electrolytic cell 141, and the rectifier 142 is located behind the motor 134. The bottom of the rectifier 142 is fixedly connected with an electrolytic rod 143 and the electrolytic rod 143 is located in the inner cavity of the electrolytic cell 141.

[0033] The wastewater is introduced into the collection tank 12 for sedimentation through two sewage inlet pipes 3, and then introduced into the sedimentation tank 131 through the discharge port 132, so that the precipitant is introduced into the sedimentation tank 131 through the precipitant tube 8, and the pH value of the wastewater is detected by a pH detector 133, and the pH is adjusted to about 7.5, so that the cadmium ions in the wastewater are in a state most suitable for chemical precipitation, and then the motor 134 is used to provide power to drive the driving shaft 135 and the stirring blades 136 to accelerate the mixing and precipitation of the cadmium ions to improve the efficiency, and then the rectifier 142 adjusts the motor to use the electrolytic rod 143 to electrolyze the cadmium ions in the inner cavity of the electrolytic cell 141 to precipitate.

[0034] like Figure 4 , Figure 5 As shown, the membrane separation component 15 includes a filter box 151, a pH detector 152 is fixedly connected to the top of the filter box 151 and located in the middle of the three box covers 2, a nanofiber membrane 153 is fixedly installed in the inner cavity of the filter box 151, a composite nanofiber membrane 154 is fixedly installed in the inner cavity of the filter box 151 and the composite nanofiber membrane 154 is located in front of the nanofiber membrane 153, and the power component 7 includes two fixed boxes 71 and a driving rod 73, and the opposite surfaces of the two fixed boxes 71 are fixedly connected to the left and right sides of the processing box body 11, and the fixed The front ends of the left and right sides of the inner wall of the fixed box 71 are fixedly connected with tooth blocks 72, the front and rear ends of the lower part of the driving rod 73 are fixedly connected with motor 2 74, the output ends of the front and rear motor 2 74 are fixedly connected with gears 75, the surface of the gear 75 is meshed with the surfaces of the two tooth blocks 72, the upper opposite surfaces of the two driving rods 73 are fixedly connected with mounting frames 76, the bottom of the mounting frames 76 are fixedly connected with three brush rods 77, the front and rear opposite surfaces and the middle surfaces away from each other of the three brush rods 77 overlap with the front and rear surfaces of the nanofiber membrane 153 and the composite nanofiber membrane 154.

[0035] The wastewater that has been precipitated many times is detected by using a pH detector 152 in the inner cavity of the filter box 151, so that the nanofiber membrane 153 and the composite nanofiber membrane 154 adsorb cadmium ions from the wastewater. After the adsorption, the cadmium ions are eluted, and then the motor 74 fixedly connected to the front and back of the lower part of the driving rod 73 provides power to drive the gear 75 to rotate and engage with the tooth block 72, thereby driving the driving rod 73 up and down in the inner cavity of the fixed box 71, and driving the three fixedly connected mounting frames 76 on the opposite sides of the driving rod 73 up and down, thereby driving the brush rod 77 fixedly connected to the bottom of the three mounting frames 76 to clean the surface stains of the nanofiber membrane 153 and the composite nanofiber membrane 154 to prevent the filtration effect from being reduced.

[0036] The working principle of the utility model is as follows: wastewater is fed into the collection tank 12 for precipitation through two sewage inlet pipes 3, and then the wastewater is fed into the sedimentation tank 131 through the discharge port 132, so that the precipitant is fed into the sedimentation tank 131 through the precipitant pipe 8, and the PH value of the wastewater is detected by a PH detector 133, and the PH is adjusted to about 7.5, so that the cadmium ions in the wastewater are in a state most suitable for chemical precipitation, and then the motor 134 is used to provide power to drive the driving shaft 135 and the stirring blade 136 to accelerate the auxiliary mixing and precipitation of cadmium ions, thereby improving the efficiency, and then the rectifier 142 adjusts the motor to use the electrolytic rod 143 to electrolyze the wastewater cadmium ions in the inner cavity of the electrolytic cell 141 to precipitate, and then through the precipitation The wastewater is repeatedly tested by a pH meter 152 in the inner cavity of the filter box 151, and the nanofiber membrane 153 and the composite nanofiber membrane 154 adsorb cadmium ions from the wastewater. The cadmium ions are eluted after adsorption, and then the motor 74 fixedly connected to the front and back of the lower part of the driving rod 73 provides power to drive the gear 75 to rotate and engage with the tooth block 72, thereby driving the driving rod 73 up and down in the inner cavity of the fixed box 71, and driving the three fixedly connected mounting brackets 76 on the opposite sides of the driving rod 73 up and down, thereby driving the brush rod 77 fixedly connected to the bottom of the three mounting brackets 76 to clean the surface stains of the nanofiber membrane 153 and the composite nanofiber membrane 154 to prevent the filtration effect from being reduced.

[0037] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A cadmium-containing industrial wastewater treatment device, comprising three box covers (2), characterized in that: A processing assembly (1) is fixedly installed below the three box covers (2); two sewage inlet pipes (3) are fixedly connected to the front of the processing assembly (1); the outer surfaces of the two sewage inlet pipes (3) are fixedly connected to control valve 2 (4); a sewage outlet pipe (5) is fixedly connected to the right side of the processing assembly (1); a pump (6) is fixedly connected to the front outer surface of the sewage outlet pipe (5); a power assembly (7) is fixedly connected to the rear of the left and right sides of the processing assembly (1); and a precipitant pipe (8) is fixedly connected to the left side of the top of the front box cover (2).

2. A cadmium-containing industrial wastewater treatment device according to claim 1, characterized in that: The treatment component (1) comprises a treatment box (11), the inner cavity of the treatment box (11) is provided with a collection tank (12), the front of the treatment box (11) is fixedly connected to the outer surfaces of two control valves (4), the bottom of the rear of the treatment box (11) is fixedly connected to a drain pipe (110), the outer surface of the drain pipe (110) is fixedly connected to a control valve (111), the inner cavity of the treatment box (11) is provided with a sedimentation component (13), and the sedimentation component (13) is located behind the collection tank (12), the inner cavity of the treatment box (11) is provided with an electrolysis component (14), and the electrolysis component (14) is located behind the sedimentation component (13), and the inner cavity of the treatment box (11) is provided with a membrane separation component (15), and the membrane separation component (15) is located behind the electrolysis component (14).

3. A cadmium-containing industrial wastewater treatment device according to claim 2, characterized in that: The inner cavity of the treatment box (11) is provided with a secondary sedimentation tank (16), and the secondary sedimentation tank (16) is located behind the membrane separation component (15); the inner cavity of the treatment box (11) is provided with an external discharge tank (17), and the external discharge tank (17) is located behind the secondary sedimentation tank (16); the rear of the external discharge tank (17) is fixedly connected to the front end of the drainage pipe (110).

4. A cadmium-containing industrial wastewater treatment device according to claim 3, characterized in that: The right bottoms of the collecting tank (12), the sedimentation assembly (13), the electrolysis assembly (14) and the secondary sedimentation tank (16) are all fixedly connected to a sewage discharge pipe (19); the outer surfaces of the four sewage discharge pipes (19) are fixedly connected to a control valve 1 (18); and the right side of the control valve 1 (18) is fixedly connected to a sewage outlet pipe (5).

5. The cadmium-containing industrial wastewater treatment device according to claim 2, characterized in that: The sedimentation assembly (13) comprises a sedimentation tank (131), the inner wall of which is provided with discharge ports (132) at the front and rear ends, and a pH detector (133) is provided on the inner cavity side of the sedimentation tank (131), wherein the upper bottom end of the pH detector (133) is fixedly mounted on the top of the box cover (2).

6. A cadmium-containing industrial wastewater treatment device according to claim 5, characterized in that: A motor 1 (134) is fixedly mounted on the top of the front of the three box covers (2), and the motor 1 (134) is located above the sedimentation tank (131); a driving shaft (135) is fixedly connected to the bottom of the motor 1 (134), and the driving shaft (135) is located in the inner cavity of the sedimentation tank (131); and four stirring blades (136) are fixedly connected to the front and rear outer surfaces of the driving shaft (135).

7. A cadmium-containing industrial wastewater treatment device according to claim 2, characterized in that: The electrolytic assembly (14) includes an electrolytic cell (141), a rectifier (142) is fixedly connected to the top of the front of the three box covers (2), and the rectifier (142) is located above the electrolytic cell (141), and the rectifier (142) is located behind the motor 1 (134), and an electrolytic rod (143) is fixedly connected to the bottom of the rectifier (142), and the electrolytic rod (143) is located in the inner cavity of the electrolytic cell (141).

8. The cadmium-containing industrial wastewater treatment device according to claim 2, characterized in that: The membrane separation component (15) includes a filter box (151), a pH detector 2 (152) is fixedly connected to the top of the filter box (151) and located in the middle of the three box covers (2), a nanofiber membrane (153) is fixedly installed in the inner cavity of the filter box (151), and a composite nanofiber membrane (154) is fixedly installed in the inner cavity of the filter box (151), and the composite nanofiber membrane (154) is located in front of the nanofiber membrane (153).

9. The cadmium-containing industrial wastewater treatment device according to claim 8, characterized in that: The power assembly (7) comprises two fixed boxes (71) and a driving rod (73). The opposite surfaces of the two fixed boxes (71) are fixedly connected to the left and right sides of the processing box (11). The front ends of the left and right sides of the inner walls of the fixed boxes (71) are fixedly connected with tooth blocks (72).

10. The cadmium-containing industrial wastewater treatment device according to claim 9, characterized in that: The lower part of the driving rod (73) is fixedly connected to the motor 2 (74) at the front and rear ends, and the output ends of the motor 2 (74) are fixedly connected to the gear (75), and the surface of the gear (75) meshes with the surfaces of the two gear blocks (72). The upper opposite surfaces of the two driving rods (73) are fixedly connected to the mounting frame (76), and the bottom of the mounting frame (76) is fixedly connected to three brush rods (77), and the front and rear opposite surfaces and the middle surfaces away from each other of the three brush rods (77) overlap with the front and rear surfaces of the nanofiber membrane (153) and the composite nanofiber membrane (154).

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