Dosing sewage treatment device

Abstract

The invention discloses a dosing sewage treatment device, and relates to the technical field of sewage treatment equipment.The device comprises a purification tank, a water inlet fixedly penetrates through the left side of the purification tank, a water outlet fixedly penetrates through the right side of the purification tank, a feeding port fixedly penetrates through the top of the purification tank, and a motor is fixedly mounted on the right side of the purification tank; a transmission shaft is fixedly mounted at the output end of the motor; the device further comprises a medicine feeding device, a pressure relief device and a filtering device; wherein the chemical feeding device comprises a stirring rod, a round pipe, a connecting column, a disc, a V-shaped rod, a conical disc, a sliding rod and a fixing block, the stirring rod is fixedly installed on the circumferential surface of the transmission shaft, the round pipe is fixedly installed at the bottom of the feeding port, and the stirring rod rotates to stir chemicals and sewage, so that the chemicals and the sewage are better fused; meanwhile, the medicament feeding amount is controlled, and waste caused by excessive medicament feeding amount is prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment equipment, and specifically relates to a chemical dosing sewage treatment device. Background Art

[0002] During the production and processing of the metal pipe industry, a large amount of industrial wastewater is inevitably generated. This industrial wastewater cannot be directly discharged from the factory and needs to be purified. Some wastewater requires the addition of chemicals to assist in purification during the treatment process. As an important sewage treatment equipment, the chemical dosing sewage treatment device is widely used in the field of industrial sewage treatment due to its high efficiency, economy, strong adaptability, etc.

[0003] The patent with the patent announcement number CN211871435U relates to a chemical dosing sewage treatment device for sewage treatment, including a mixing tank, a flow pump, a connecting pipe, an installation pipe body, a chemical dosing pipe tray, and a mixing component. The installation pipe body is installed on the pipeline between each section of the sewage to be treated. The chemical dosing pipe tray and the mixing component are arranged on the cross-section of the installation pipe body. The mixing tank and the flow pump are arranged on one side of the installation pipe body. The connecting pipe is arranged between the mixing tank and the flow pump and between the flow pump and the chemical dosing pipe tray. The mixing component has two groups, namely a pre-mixing component and a post-mixing component. The pre-mixing component and the post-mixing component are respectively arranged on both sides of the chemical dosing pipe tray. The utility model belongs to the technical field of sewage treatment equipment, and specifically is a chemical dosing sewage treatment device for sewage treatment that can improve the uniformity of chemical dosing, make the chemicals easy to mix after being added, increase the mixing speed of the chemicals in the sewage, can save the number of sewage treatment ponds, simplify the treatment process, and improve the sewage treatment efficiency.

[0004] In the above patent, there is a chemical dosing sewage treatment device for sewage treatment that can increase the mixing speed of the chemicals in the sewage, can save the number of sewage treatment ponds, simplify the treatment process, and improve the sewage treatment efficiency. However, during the process of adding the chemicals to the sewage, it is difficult to control the amount of chemicals added, resulting in waste of chemicals. At the same time, there are precipitates when the chemicals are added to the sewage, and it is difficult to completely dissolve the chemicals in the water. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides a chemical dosing sewage treatment device, which solves the problems raised in the above background art.

[0006] To achieve the above objectives, the present invention is realized through the following technical solutions: A chemical dosing sewage treatment device includes a purification tank. The left side of the purification tank is fixedly penetrated with a water inlet, the right side of the purification tank is fixedly penetrated with a water outlet, the top of the purification tank is fixedly penetrated with a feed inlet, a motor is fixedly installed on the right side of the purification tank, a transmission shaft is fixedly installed at the output end of the motor, and further includes a chemical feeding device, a pressure relief device, and a filtering device; Among them, the medicine feeding device includes a stirring rod, a circular tube, a connecting column, a disc, a V-shaped rod, a conical disc, a sliding rod and a fixing block. The stirring rod is fixedly installed on the circumferential surface of the transmission shaft. The circular tube is fixedly installed at the bottom of the feeding port. The conical disc is slidably installed at the bottom of the inner wall of the feeding port. The connecting column is fixedly installed at the bottom of the conical disc. The disc is fixedly installed on the circumferential surface of the connecting column. The V-shaped rod is fixedly installed at the bottom of the connecting column. The sliding rod is slidably installed on the inner wall of the circular tube. The fixing block is fixedly installed on the inner wall of the circular tube. The stirring rod rotates to contact the V-shaped rod and extrude the V-shaped rod. The V-shaped rod moves upward under the extrusion force. The upward movement of the V-shaped rod drives the connecting column to move upward, the upward movement drives the disc to move upward, and at the same time the upward movement drives the conical disc to move upward, opening the seal of the circular tube and allowing the medicine to enter the purification tank.

[0007] According to the above technical solution, a first filter screen is fixedly installed on the inner wall of the purification tank, a second filter screen is fixedly installed on the inner wall of the purification tank. A reciprocating thread groove is provided on the circumferential surface of the transmission shaft. The transmission shaft threadedly penetrates the reflux plate. A long rod is fixedly installed on the right side of the second filter screen. The reflux plate is slidably installed on the surface of the long rod, filtering the impurity solids in the sewage to improve the purification effect. At the same time, the reflux plate reciprocates the sewage, enabling the medicine to better blend with the sewage and improving the purification efficiency.

[0008] According to the above technical solution, a first spring is provided between the sliding rod and the fixing block. An arc-shaped hole is provided on the surface of the disc. The V-shaped rod is an arc surface close to the stirring rod, facilitating the reset of the sliding rod, enabling the conical disc to reciprocate, controlling the medicine feeding, and at the same time enabling the disc to reciprocate to disperse the medicine.

[0009] According to the above technical solution, the pressure relief device includes an exhaust pipe, a pressure relief disc, a sealing disc, an L-shaped rod, a cross bar, an elastic telescopic rod and a third filter screen. The exhaust pipe fixedly penetrates the inner and outer walls of the purification tank. The pressure relief disc is slidably installed on the inner wall of the exhaust pipe. The sealing disc is slidably installed on the side of the pressure relief disc close to the first filter screen. The L-shaped rod is fixedly installed on the side of the sealing disc close to the first filter screen. The cross bar is fixedly installed on the side of the L-shaped rod close to the disc. One end of the elastic telescopic rod is fixedly installed on the top of the cross bar, and the other end of the elastic telescopic rod is slidably installed on the bottom of the exhaust pipe. The pressure relief disc is provided with a round hole, and the third filter screen is fixedly installed on the inner wall of the round hole. The cross bar moves in the direction close to the disc to contact the disc. When the disc moves upward, it drives the cross bar to move upward. The upward movement of the cross bar drives the L-shaped rod to move upward. The upward movement of the L-shaped rod drives the sealing disc to move upward, and the upward movement of the sealing disc releases the seal of the disc.

[0010] According to the above technical solution, a second spring is provided between the pressure relief disc and the exhaust pipe. The side of the cross bar close to the disc is inclined, which facilitates the reset of the pressure relief disc and reciprocally exhausts the air pressure inside the purification tank.

[0011] According to the above technical solution, the filtering device includes a sliding rod, a threaded column, an activated carbon box, a rotating ring, a circular ring, a fan blade and an arc-shaped block. The sliding rod slidably penetrates the inner and outer walls of the exhaust pipe. The threaded column is rotatably installed at the top of the sliding rod. The activated carbon box is fixedly installed on the inner wall of the exhaust pipe. The rotating ring is threadedly connected to the circumferential surface of the threaded column. The circular ring is sleeved on the circumferential surface of the rotating ring. The fan blade is fixedly installed on the circumferential surface of the circular ring. The arc-shaped block is fixedly installed at the bottom of the inner wall of the activated carbon box. When the cross bar moves upward to contact the sliding rod and extrude the sliding rod, the sliding rod moves upward under the extrusion force. The upward movement of the sliding rod drives the threaded column to move upward. The upward movement of the threaded column drives the rotating ring to rotate through the threaded groove. The rotation of the rotating ring drives the circular ring to rotate, and the rotation drives the fan blade to rotate.

[0012] According to the above technical solution, a reciprocating threaded groove is provided on the circumferential surface of the threaded column. The threaded column slidably penetrates the activated carbon box, enabling the rotating ring to rotate forward and backward, better enabling the fan blade to stir the activated carbon and improving the purification efficiency.

[0013] According to the above technical solution, square holes are provided on the surface of the reflux plate. The transmission shaft rotatably penetrates the first filter screen and the second filter screen, filtering and refluxing the sewage, and facilitating the rotation of the rotating shaft.

[0014] The present invention provides a dosing sewage treatment device. It has the following beneficial effects: (1) In this invention, when sewage needs to be treated, the motor is started. The start of the motor drives the transmission shaft to rotate. The rotation of the transmission shaft drives the stirring rod to rotate, stirring the sewage and the medicament, enabling better dissolution of the water and the medicament, and better purifying the sewage. At the same time, the rotation of the stirring rod contacts and squeezes the V-shaped rod. The V-shaped rod moves upward under the extrusion force, controlling the dosage of the medicament, preventing excessive dosage of the medicament and causing waste of the medicament. At the same time, the upward movement of the V-shaped rod drives the disc to move upward, dispersing the medicament and preventing the medicament from concentrating and piling up, making it difficult to dissolve.

[0015] (2)When the invention treats sewage, the reagent dissolves with the sewage to generate gas. When the air pressure inside the purification tank is too high, the air pressure pushes the pressure relief disc to move towards the direction close to the disc. The movement of the pressure relief disc drives the cross bar to move. When the cross bar contacts the disc, the upward movement of the disc drives the cross bar to move upward, releasing the seal on the pressure relief disc and discharging the gas inside the purification tank, preventing the air pressure inside the purification tank from being too high and affecting the purification efficiency. At the same time of discharging the air pressure, it is discharged through the third filter screen to prevent the reagent from flowing out with the gas during pressure relief, resulting in waste of the reagent.

[0016] (3)When the invention relieves pressure, the cross bar contacts the sliding rod and squeezes the sliding rod. The upward movement of the sliding rod drives the threaded column to move upward, and drives the rotating ring to rotate through the thread on the surface of the threaded column, stirring the activated carbon inside the activated carbon box, enabling the activated carbon to fully contact the gas, preventing the discharge of toxic gas and harming people's bodies. At the same time, the fan blade rotates and contacts the arc-shaped block, causing the fan blade to move upward under the extrusion force, stirring the activated carbon up and down, better increasing the contact area between the activated carbon and the toxic gas, and purifying the toxic gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic sectional structure diagram of the purification tank of the present invention; Figure 3 is a schematic structure diagram of the position of the round tube and the feed port of the present invention; Figure 4 is a schematic structure diagram of the position of the sliding rod and the round tube of the present invention; Figure 5 is a schematic structure diagram of the position of the purification tank and the exhaust pipe of the present invention; Figure 6 is the present invention Figure 5 an enlarged schematic structure diagram of A in; Figure 7 is a schematic structure diagram of the position of the sliding rod and the exhaust pipe of the present invention; Figure 8 is the present invention Figure 7 an enlarged schematic structure diagram of B in; Figure 9 is a schematic structure diagram of the position of the rotating ring and the threaded column of the present invention.

[0018] In the figure: 1, purification tank; 2, water inlet; 3, water outlet; 4, feed inlet; 5, motor; 6, transmission shaft; 7, first filter screen; 8, second filter screen; 9, reflux plate; 101, stirring rod; 102, round tube; 103, connecting column; 104, disc; 105, V-shaped rod; 106, conical disc; 107, sliding rod; 108, fixing block; 111, exhaust pipe; 112, pressure relief disc; 113, sealing disc; 114, L-shaped rod; 115, cross bar; 116, elastic telescopic rod; 117, third filter screen; 121, slide bar; 122, threaded column; 123, activated carbon box; 124, rotating ring; 125, ring; 126, fan blade; 127, arc-shaped block; 13, long rod. Detailed implementation manner

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0020] Please refer to Figures 1-9 , an embodiment of the present invention is: a chemical dosing sewage treatment device, including a purification tank 1, a water inlet 2 is fixedly penetrated through the left side of the purification tank 1, a water outlet 3 is fixedly penetrated through the right side of the purification tank 1, a feed inlet 4 is fixedly penetrated through the top of the purification tank 1, a motor 5 is fixedly installed on the right side of the purification tank 1, a transmission shaft 6 is fixedly installed at the output end of the motor 5, and a chemical dosing device is further included; Among them, the chemical dosing device includes a stirring rod 101, a round tube 102, a connecting column 103, a disc 104, a V-shaped rod 105, a conical disc 106, a sliding rod 107 and a fixing block 108. The stirring rod 101 is fixedly installed on the circumferential surface of the transmission shaft 6, the round tube 102 is fixedly installed at the bottom of the feed inlet 4, the conical disc 106 is slidably installed on the inner wall bottom of the feed inlet 4, the connecting column 103 is fixedly installed at the bottom of the conical disc 106, the disc 104 is fixedly installed on the circumferential surface of the connecting column 103, the V-shaped rod 105 is fixedly installed at the bottom of the connecting column 103, the sliding rod 107 is slidably installed on the inner wall of the round tube 102, the fixing block 108 is fixedly installed on the inner wall of the round tube 102. By rotating the stirring rod 101, the chemical agent and sewage are stirred, so that the chemical agent and sewage are better fused, and at the same time, the chemical agent input amount is controlled to prevent excessive input of the chemical agent and cause waste. By reciprocating the disc 104, the chemical agent is dispersed to prevent the chemical agent from accumulating in one place and being difficult to dissolve.

[0021] The inner wall of the purification tank 1 is fixedly installed with a first filter screen 7, and the inner wall of the purification tank 1 is fixedly installed with a second filter screen 8. A reciprocating thread groove is provided on the circumferential surface of the transmission shaft 6. The transmission shaft 6 threadedly penetrates through the reflux plate 9. A long rod 13 is fixedly installed on the right side of the second filter screen 8. The reflux plate 9 is slidably installed on the surface of the long rod 13, filtering the impurity solids in the sewage, improving the purification effect. At the same time, the reflux plate 9 reciprocates the sewage, enabling the medicament to better blend with the sewage and improving the purification efficiency.

[0022] A first spring is arranged between the sliding rod 107 and the fixed block 108. An arc-shaped hole is provided on the surface of the disc 104. The surface of the V-shaped rod 105 close to the stirring rod 101 is an arc surface, facilitating the reset of the sliding rod 107, enabling the tapered disc 106 to reciprocate, controlling the feeding of the medicament, and preventing waste caused by excessive addition of the medicament.

[0023] When this embodiment works: When sewage needs to be purified, the sewage is pumped into the purification tank 1 from the water inlet 2. At the same time, the motor 5 is started. The motor 5 drives the reflux plate 9 to reciprocate, performing reflux treatment on the sewage, enabling the sewage to better contact with the medicament. At the same time, the motor 5 drives the transmission shaft 6 to rotate. The transmission shaft 6 drives the stirring rod 101 to rotate, stirring the sewage to make the medicament better dissolve in the sewage. The stirring rod 101 rotates and contacts the V-shaped rod 105 and extrudes the V-shaped rod 105. The V-shaped rod 105 moves upward under the extrusion force. The upward movement of the V-shaped rod 105 drives the connecting column 103 to move upward. The upward movement of 103 drives the disc 104 to move upward. At the same time, the upward movement of the connecting column 103 drives the tapered disc 106 to move upward, opening the seal of the round tube 102, enabling the medicament to enter the interior of the purification tank 1. At the same time, when the stirring rod 101 is separated from the V-shaped rod 105, the connecting column 103 moves downward under the elastic force of the first spring. The downward movement of the connecting column 103 drives the tapered disc 106 to move downward, sealing the round tube 102, enabling the tapered disc 106 to reciprocate, controlling the feeding of the medicament, preventing excessive feeding of the medicament and causing waste. At the same time, the downward movement of the connecting column 103 drives the disc 104 to move downward, enabling the disc 104 to reciprocate, dispersing the medicament, and preventing the medicament from accumulating in one place and being difficult to dissolve.

[0024] Please refer to Figures 1-9, on the basis of the above embodiments, in another embodiment of the present invention, a pressure relief device and a filtering device are further included. The pressure relief device includes an exhaust pipe 111, a pressure relief disc 112, a sealing disc 113, an L-shaped rod 114, a cross bar 115, an elastic telescopic rod 116, and a third filter screen 117. The exhaust pipe 111 is fixedly penetrated through the inner and outer walls of the purification tank 1. The pressure relief disc 112 is slidably installed on the inner wall of the exhaust pipe 111. The sealing disc 113 is slidably installed on the side of the pressure relief disc 112 close to the first filter screen 7. The L-shaped rod 114 is fixedly installed on the side of the sealing disc 113 close to the first filter screen 7. The cross bar 115 is fixedly installed on the side of the L-shaped rod 114 close to the disc 104. One end of the elastic telescopic rod 116 is fixedly installed on the top of the cross bar 115, and the other end of the elastic telescopic rod 116 is slidably installed on the bottom of the exhaust pipe 111. The pressure relief disc 112 is provided with a round hole, and the third filter screen 117 is fixedly installed on the inner wall of the round hole. The air pressure inside the purification tank 1 is discharged through the exhaust pipe 111 to prevent the air pressure inside the purification tank 1 from being too large, which affects the sewage purification effect and reduces the sewage purification efficiency. At the same time, when the gas is discharged through the third filter screen 117, the medicine is filtered to prevent the medicine from being discharged following the air flow when the air pressure is discharged, resulting in waste of the medicine. A second spring is arranged between the pressure relief disc 112 and the exhaust pipe 111. The side of the cross bar 115 close to the disc 104 is a slope, which is convenient for the pressure relief disc 112 to reset and reciprocally exhaust the air pressure inside the purification tank 1.

[0025] The filtering device includes a slide bar 121, a threaded column 122, an activated carbon box 123, a rotating ring 124, a ring 125, a fan blade 126, and an arc-shaped block 127. The slide bar 121 slidably penetrates through the inner and outer walls of the exhaust pipe 111. The threaded column 122 is rotatably installed on the top of the slide bar 121. The activated carbon box 123 is fixedly installed on the inner wall of the exhaust pipe 111. The rotating ring 124 is threadedly connected to the circumferential surface of the threaded column 122. The ring 125 is sleeved on the circumferential surface of the rotating ring 124. The fan blade 126 is fixedly installed on the circumferential surface of the ring 125. The arc-shaped block 127 is fixedly installed on the bottom of the inner wall of the activated carbon box 123, purifying the gas generated by the dissolution of the medicine and the sewage. At the same time, the fan blade 126 stirs the activated carbon inside the activated carbon box 123, enabling the activated carbon to better contact the gas, thereby better purifying the toxic gas.

[0026] The circumferential surface of the threaded column 122 is provided with a reciprocating thread groove. The threaded column 122 slidably penetrates through the activated carbon box 123, causing the rotating ring 124 to rotate forward and backward, enabling the fan blade 126 to better stir the activated carbon and improving the purification efficiency.

[0027] The surface of the reflux plate 9 is provided with square holes. The transmission shaft 6 rotatably penetrates through the first filter screen 7, and the transmission shaft 6 rotatably penetrates through the second filter screen 8, filtering and refluxing the sewage to improve the sewage purification effect.

[0028] When the medicament dissolves in the sewage, gas is generated. When the air pressure inside the purification tank 1 is too high, the air pressure will push the pressure relief disc 112 to move towards the disc 104. The movement of the pressure relief disc 112 towards the disc 104 drives the L-shaped rod 114 to move towards the disc 104. The movement of the L-shaped rod 114 towards the disc 104 drives the cross bar 115 to move towards the disc 104. The movement of the cross bar 115 towards the disc 104 causes it to contact the disc 104. When the disc 104 moves upward, it drives the cross bar 115 to move upward. The upward movement of the cross bar 115 drives the L-shaped rod 114 to move upward. The upward movement of the L-shaped rod 114 drives the sealing disc 113 to move upward. The upward movement of the sealing disc 113 releases the seal on the disc 104, allowing the gas to be discharged from the round hole, preventing the air pressure inside the purification tank 1 from being too high and affecting the purification efficiency. The gas is discharged through the third filter screen 117, preventing the medicament from being discharged when the gas is discharged and causing waste of the medicament.

[0029] When the gas is discharged, the toxic gas moves upward through the exhaust pipe 111 and contacts the activated carbon box 123. The activated carbon box 123 purifies the gas to prevent the toxic gas from being discharged and affecting the surrounding environment. At the same time, the cross bar 115 moves upward and contacts the sliding rod 121 and exerts pressure on the sliding rod 121. The sliding rod 121 moves upward under the extrusion force. The upward movement of the sliding rod 121 drives the threaded column 122 to move upward. The upward movement of the threaded column 122 drives the rotating ring 124 to rotate through the threaded groove. The rotation of the rotating ring 124 drives the circular ring 125 to rotate. The rotation of the circular ring 125 drives the fan blade 126 to rotate, increasing the contact area between the toxic gas and the activated carbon and purifying the toxic gas. At the same time, the fan blade 126 contacts the arc-shaped block 127, and the arc-shaped block 127 exerts pressure on the fan blade 126, causing the fan blade 126 to move upward and stirring the activated carbon box 123 up and down to better allow the toxic gas to contact the activated carbon and purify the toxic gas.

[0030] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A dosing sewage treatment device, comprising a purification tank (1), characterized in that: A water inlet (2) is fixedly penetrated through the left side of the purification tank (1), a water outlet (3) is fixedly penetrated through the right side of the purification tank (1), a feed inlet (4) is fixedly penetrated through the top of the purification tank (1), a motor (5) is fixedly installed on the right side of the purification tank (1), a transmission shaft (6) is fixedly installed at the output end of the motor (5), and a medicine feeding device, a pressure relief device and a filtering device are further included; Among them, the medicine feeding device includes a stirring rod (101), a circular tube (102), a connecting column (103), a disc (104), a V-shaped rod (105), a conical disc (106), a sliding rod (107) and a fixing block (108). The stirring rod (101) is fixedly installed on the circumferential surface of the transmission shaft (6). The circular tube (102) is fixedly installed at the bottom of the feed inlet (4). The conical disc (106) is slidably installed on the inner bottom wall of the feed inlet (4). The connecting column (103) is fixedly installed at the bottom of the conical disc (106). The disc (104) is fixedly installed on the circumferential surface of the connecting column (103). The V-shaped rod (105) is fixedly installed at the bottom of the connecting column (103). The sliding rod (107) is slidably installed on the inner wall of the circular tube (102). The fixing block (108) is fixedly installed on the inner wall of the circular tube (102).

2. The dosing sewage treatment device according to claim 1, characterized in that: A first filter screen (7) is fixedly installed on the inner wall of the purification tank (1), a second filter screen (8) is fixedly installed on the inner wall of the purification tank (1). A reciprocating thread groove is formed on the circumferential surface of the transmission shaft (6). The transmission shaft (6) is threadedly penetrated through a reflux plate (9). A long rod (13) is fixedly installed on the right side of the second filter screen (8). The reflux plate (9) is slidably installed on the surface of the long rod (13).

3. The chemical dosing sewage treatment device according to claim 2, wherein: A first spring is arranged between the sliding rod (107) and the fixing block (108). An arc-shaped hole is formed on the surface of the disc (104). The V-shaped rod (105) is an arc surface near the stirring rod (101).

4. The dosing sewage treatment device according to claim 3, characterized in that: The pressure relief device includes an exhaust pipe (111), a pressure relief disc (112), a sealing disc (113), an L-shaped rod (114), a cross bar (115), an elastic telescopic rod (116) and a third filter screen (117). The exhaust pipe (111) is fixedly penetrated through the inner and outer walls of the purification tank (1). The pressure relief disc (112) is slidably installed on the inner wall of the exhaust pipe (111). The sealing disc (113) is slidably installed on the side of the pressure relief disc (112) close to the first filter screen (7). The L-shaped rod (114) is fixedly installed on the side of the sealing disc (113) close to the first filter screen (7). The cross bar (115) is fixedly installed on the side of the L-shaped rod (114) close to the disc (104). One end of the elastic telescopic rod (116) is fixedly installed on the top of the cross bar (115). The other end of the elastic telescopic rod (116) is slidably installed on the bottom of the exhaust pipe (111). A circular hole is formed in the pressure relief disc (112). The third filter screen (117) is fixedly installed on the inner wall of the circular hole.

5. The chemical dosing sewage treatment device according to claim 4, characterized in that: A second spring is provided between the pressure relief disc (112) and the exhaust pipe (111), and the side of the cross bar (115) close to the disc (104) is an inclined surface.

6. The dosing sewage treatment device according to claim 5, characterized in that: The filtering device includes a sliding rod (121), a threaded column (122), an activated carbon box (123), a rotating ring (124), a circular ring (125), a fan blade (126) and an arc-shaped block (127). The sliding rod (121) slidably penetrates the inner and outer walls of the exhaust pipe (111). The threaded column (122) is rotatably installed at the top of the sliding rod (121). The activated carbon box (123) is fixedly installed on the inner wall of the exhaust pipe (111). The rotating ring (124) is threadedly connected to the circumferential surface of the threaded column (122). The circular ring (125) is sleeved on the circumferential surface of the rotating ring (124). The fan blade (126) is fixedly installed on the circumferential surface of the circular ring (125). The arc-shaped block (127) is fixedly installed at the bottom of the inner wall of the activated carbon box (123).

7. A chemical dosing sewage treatment device according to claim 6, characterized in that: A reciprocating thread groove is provided on the circumferential surface of the threaded column (122), and the threaded column (122) slidably penetrates the activated carbon box (123).

8. The chemical dosing sewage treatment device according to claim 1, characterized in that: Square holes are provided on the surface of the reflux plate (9). The transmission shaft (6) rotatably penetrates the first filter screen (7), and the transmission shaft (6) rotatably penetrates the second filter screen (8).

Images