Anti-blocking device for aeration pipe of biochemical pool

Abstract

The invention relates to the technical field of sewage treatment, and provides a biochemical pool aeration pipe anti-blocking device which comprises aeration branch pipes and aeration heads, the multiple aeration heads are sequentially arranged at the upper ends of the aeration branch pipes at intervals, each aeration head comprises an installation sleeve, and an air outlet top plate is arranged at the upper end of each installation sleeve; an annular communicating groove and a plurality of aeration through holes are formed in the air outlet top plate; the anti-blocking mechanism comprises a rotation driving part and an anti-blocking rod which are arranged in the mounting sleeve, when the aeration branch pipe does not input aeration airflow to the mounting sleeve, the rotation driving part is static at a first position, and when the aeration branch pipe inputs upward aeration airflow to the mounting sleeve, the aeration airflow drives the rotation driving part to rotate and rise to a second position, and the anti-blocking rod is located at the second position. At the first position, the anti-blocking rod is located below the air outlet top plate, at the second position, the upper end of the anti-blocking rod extends into the annular communicating groove and rotates along the annular communicating groove, and the anti-blocking device for the aeration pipe of the biochemical pool can effectively prevent the aeration through hole from being blocked.

Description

Technical Field

[0001] This application relates to the field of wastewater treatment technology, and more specifically, to a device for preventing blockage of aeration pipes in a biological treatment tank. Background Technology

[0002] In wastewater treatment processes, the aeration tank is the core biochemical reaction unit. Its function is to provide dissolved oxygen necessary for the metabolism of aerobic microorganisms by forcibly introducing air or oxygen into the wastewater. The activated sludge formed by these microorganisms can efficiently adsorb, decompose, and oxidize organic pollutants in wastewater, thereby achieving the purpose of purifying water quality.

[0003] The aeration system is a key component of an aeration tank, typically consisting of a main aeration pipe, branch pipes, and numerous aeration heads (such as microporous aerators) installed on the branch pipes. The aeration heads have micron-sized pores on their surface, which disperse air into tiny bubbles to increase the gas-liquid contact area, thereby improving oxygen transfer efficiency. The effectiveness of aeration directly determines the rate of biochemical reactions, wastewater treatment efficiency, and the system's operating energy consumption.

[0004] However, in actual operation, aeration systems, especially aeration heads, face a serious risk of clogging. Due to the continuous presence of high concentrations of activated sludge mixed liquor in the aeration tank, sludge flocs naturally settle under gravity. This sludge gradually invades and clogs the aeration holes on the aeration heads, leading to increased aeration resistance, a significant decrease in oxygenation capacity, and a sharp rise in energy consumption. In severe cases, it can even cause partial or complete failure of the aeration system, disrupting the stability of the biological treatment process. Summary of the Invention

[0005] In view of this, this application provides a device to prevent clogging of aeration pipes in a biological treatment tank, in order to solve the technical problem that aeration heads on aeration pipes are easily clogged in the prior art.

[0006] This application provides a device for preventing blockage of aeration pipes in a biological treatment tank. The device includes aeration branch pipes and aeration heads. Multiple aeration branch pipes are sequentially and spaced apart at the bottom of the aeration tank. Multiple aeration heads are sequentially and spaced apart at the upper end of each aeration branch pipe. Each aeration head includes: The mounting sleeve has its axis arranged vertically. The lower end of the mounting sleeve is connected to the upper end of the aeration branch pipe and communicates with the aeration branch pipe. The upper end of the mounting sleeve is provided with an air outlet plate. The air outlet plate has an annular connecting groove and multiple aeration holes. The multiple aeration holes are arranged sequentially and at intervals around the axis of the mounting sleeve. The annular connecting groove passes through each aeration hole so that the multiple aeration holes are sequentially connected. An anti-clogging mechanism is provided, comprising a rotating drive unit disposed within the mounting sleeve and an anti-clogging rod connected to the rotating drive unit. When the aeration branch pipe does not input aeration airflow to the mounting sleeve, the rotating drive unit is stationary in a first position. When the aeration branch pipe inputs upward aeration airflow to the mounting sleeve, the aeration airflow drives the rotating drive unit to rotate and rise to a second position. In the first position, the anti-clogging rod is located below the air outlet top plate. In the second position, the upper end of the anti-clogging rod extends into the annular connecting groove and rotates along the annular connecting groove.

[0007] Furthermore, the anti-blocking mechanism includes a lower fixed shaft connected to the lower end of the air outlet top plate, and a stop protrusion is provided at the lower end of the lower fixed shaft. The rotation drive part includes a rotating sleeve rotatably sleeved on the lower fixed shaft and a plurality of blades provided on the outside of the rotating sleeve. The anti-blocking rod is arranged in a vertical direction and connected to the outside of the rotating sleeve through a first transverse rod. In the first position, the lower end of the rotating sleeve is supported on the stop protrusion.

[0008] Furthermore, the lower end of the air outlet top plate is connected to a rotation assist sleeve. The rotation assist sleeve includes an outer sleeve that is circumferentially disposed on the outside of the lower fixed shaft and an inner sleeve that is rotatably installed on the inner side of the outer sleeve. A ball bearing is disposed between the outer sleeve and the inner sleeve. The inner side of the inner sleeve is spaced apart from the lower fixed shaft. In the second position, the upper end of the rotation sleeve abuts against the lower end of the inner sleeve.

[0009] Furthermore, the upper end of the anti-blocking rod is provided with a sharp blade.

[0010] Furthermore, the anti-clogging mechanism includes a top support rod connected to the outside of the rotating sleeve via a second transverse rod. The top support rod is arranged vertically, and its upper end face is higher than the upper end face of the anti-clogging rod. The anti-clogging device for the aeration pipe of the biological tank includes a movable cover that is vertically and flexibly disposed above the air outlet top plate. When the rotation drive unit is stationary in the first position, the top support rod is located below the air outlet top plate, and the movable cover blocks the annular connecting groove and multiple aeration holes. When the rotation drive unit is located in the second position, the upper end of the top support rod lifts the movable cover, thereby spacing the movable cover from the air outlet top plate. The top support rod passes through the annular connecting groove and rotates along the annular connecting groove.

[0011] Furthermore, two top support rods are symmetrically connected to the outer side of the rotating sleeve along the radial direction of the rotating sleeve.

[0012] Furthermore, the movable cover includes a lower cover portion and an annular cover portion disposed above the lower cover portion. The shape of the lower cover portion is adapted to the shape of the annular connecting groove and the plurality of aeration holes, and the lower cover portion is aligned with the annular connecting groove and the plurality of aeration holes in the vertical direction. When the rotation drive unit is stationary in the first position, the lower cover portion extends into the annular connecting groove and the plurality of aeration holes, and the annular cover portion seals the annular connecting groove and the plurality of aeration holes.

[0013] Furthermore, a roller is installed at the upper end of the top support rod, and when the rotation drive is in the second position, the roller lifts the movable cover.

[0014] Furthermore, the vent top plate includes an outer top plate located outside the annular connecting groove and an inner top plate located inside the annular connecting groove. The outer top plate is connected to the upper end of the mounting sleeve, and the upper end of the inner top plate is connected to an upper fixing shaft. The upper fixing shaft is connected to the outer wall of the mounting sleeve through a connecting bracket.

[0015] Furthermore, an installation ring is movably fitted onto the upper fixed shaft, the installation ring is connected to the movable cover, a vertical key is provided on the upper fixed shaft, and the inner side of the installation ring has a keyway that cooperates with the vertical key for positioning.

[0016] The beneficial effects of the anti-clogging device for aeration pipes in biological treatment tanks provided by this invention are as follows: Compared to existing technologies, the anti-clogging device for aeration pipes in the biological treatment tank provided by this invention incorporates an anti-clogging mechanism. When the aeration branch pipe inputs an upward aeration airflow to the mounting sleeve, the aeration airflow drives the rotating drive unit to rotate and rise to the second position. In the second position, the upper end of the anti-clogging rod extends into the annular connecting groove and can rotate along the annular connecting groove as the rotating drive unit rotates. Thus, the anti-clogging rod can rotate repeatedly through each aeration hole, clearing or breaking up the sludge that is about to enter or has already entered the aeration hole, effectively preventing the aeration holes from being blocked. When this anti-clogging device for aeration pipes in the aeration tank is used for aeration operations, no additional power source is required. The aeration airflow can drive the rotating drive unit to drive the anti-clogging rod to perform anti-clogging operations on each aeration hole.

[0017] Other beneficial effects of the present invention will be described below. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a perspective view of an anti-clogging device for aeration pipes in a biochemical tank according to an embodiment of this application. Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 This is a three-dimensional schematic diagram of the aeration head in the anti-clogging device for the aeration pipe of a biochemical tank according to an embodiment of this application; Figure 4 for Figure 3 Enlarged view of point B in the middle; Figure 5 This is a schematic diagram of the internal structure of the aeration head in the anti-clogging device for the aeration pipe of a biochemical tank according to an embodiment of this application. Figure 6 for Figure 5 Enlarged view of point C in the middle; Figure 7 for Figure 5 Enlarged view at point D; Figure 8 This is a three-dimensional schematic diagram of some components of the aeration head in the anti-clogging device for the aeration pipe of the biochemical tank according to an embodiment of this application; Figure 9 for Figure 8 Enlarged view at point E in the middle; Figure 10 for Figure 8 Enlarged view at point F; Figure 11 This is a perspective view of the movable cover in the anti-clogging device for the aeration pipe of a biochemical tank according to an embodiment of this application; Figure 12 This is a schematic diagram of the rotating drive unit in the anti-clogging device of the aeration pipe of the biochemical tank according to an embodiment of this application, when it is stationary in the first position. Figure 13 This is a schematic diagram of the rotating drive unit in the anti-clogging device of the aeration pipe of the biochemical tank according to an embodiment of this application, when it is in the second position.

[0020] Explanation of reference numerals in the attached figures: 1-Aeration main pipe; 2-Aeration branch pipe; 100-Aeration head; 101-Mounting sleeve; 102-Air outlet top plate; 103-Outer top plate; 104-Inner top plate; 105-Annular connecting groove; 106-Aeration through hole; 107-Anti-clogging rod; 108-Lower fixed shaft; 109-Stop protrusion; 110-Rotating sleeve; 111-Blade; 112-Outer sleeve; 113-Inner sleeve; 114-Sharp blade; 115-First transverse rod; 116-Second transverse rod; 117-Top support rod; 118-Modible cover; 119-Lower cover; 120-Annular cover; 121-Roller; 122-Upper fixed shaft; 123-Mounting ring; 124-Vertical key; 125-Keyway. Detailed Implementation

[0021] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. One or more embodiments of this application are exemplarily shown in the drawings to provide a more accurate and thorough understanding of the technical solutions disclosed herein. However, it should be understood that this application can be implemented in many different forms and is not limited to the embodiments described below.

[0022] In the accompanying drawings of this application, the same or similar reference numerals correspond to the same or similar components. In the description of this application, it should be understood that if terms such as "upper," "lower," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this application. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0023] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously.

[0024] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0025] See Figures 1 to 13 This application provides a device for preventing blockage of aeration pipes in a biological treatment tank. The device includes aeration branch pipes 2 and aeration heads 100. Multiple aeration branch pipes 2 are sequentially and spaced apart at the bottom of the aeration tank. Multiple aeration heads 100 are sequentially and spaced apart at the upper end of each aeration branch pipe 2. The inlet end of each of the multiple aeration branch pipes 2 can be connected to the same main aeration pipe 1. Each aeration head 100 includes: Mounting sleeve 101, the axis of mounting sleeve 101 is arranged in the vertical direction, the lower end of mounting sleeve 101 is connected to the upper end of aeration branch pipe 2 and communicates with aeration branch pipe 2, the upper end of mounting sleeve 101 is provided with an air outlet top plate 102, an annular connecting groove 105 and multiple aeration through holes 106 are formed on the air outlet top plate 102, the multiple aeration through holes 106 are arranged sequentially and at intervals around the axis of mounting sleeve 101, and the annular connecting groove 105 passes through each aeration through hole 106 so that the multiple aeration through holes 106 are connected sequentially. The anti-clogging mechanism includes a rotating drive unit disposed within the mounting sleeve 101 and an anti-clogging rod 107 connected to the rotating drive unit. When the aeration branch pipe 2 does not input aeration airflow into the mounting sleeve 101, the rotating drive unit is stationary in the first position. When the aeration branch pipe 2 inputs upward aeration airflow into the mounting sleeve 101, the aeration airflow drives the rotating drive unit to rotate and rise to the second position. In the first position, the anti-clogging rod 107 is located below the air outlet top plate 102. In the second position, the upper end of the anti-clogging rod 107 extends into the annular connecting groove 105 and rotates along the annular connecting groove 105. After the aeration operation stops, no more aeration airflow enters the mounting sleeve 101 from the aeration branch pipe 2 upwards, and the rotating drive unit falls back to the first position due to its own weight.

[0026] Because the anti-clogging device for the aeration pipe of the biochemical tank provided by the present invention is equipped with an anti-clogging mechanism, when the aeration branch pipe 2 inputs an upward aeration airflow to the mounting sleeve 101, the aeration airflow drives the rotating drive unit to rotate and rise to the second position. In the second position, the upper end of the anti-clogging rod 107 extends into the annular connecting groove 105 and can rotate along the annular connecting groove 105 with the rotation drive unit. Thus, the anti-clogging rod 107 can rotate circle by circle and repeatedly pass through each aeration hole 106, clearing or breaking the sludge that is about to enter or has already entered the aeration hole 106, which can effectively prevent each aeration hole 106 from being blocked. When the biochemical tank aeration pipe anti-clogging device is used for aeration in the aeration tank, no additional power source is required. The aeration airflow can drive the rotating drive unit to drive the anti-clogging rod 107 to perform anti-clogging operation on each aeration hole 106.

[0027] According to one embodiment of the present invention, the anti-blocking mechanism includes a lower fixed shaft 108 connected to the lower end of the air outlet top plate 102. The lower end of the lower fixed shaft 108 is provided with a stop protrusion 109. The rotation drive part includes a rotating sleeve 110 rotatably sleeved on the lower fixed shaft 108 and a plurality of blades 111 provided on the outside of the rotating sleeve 110. The anti-blocking rod 107 is arranged in the vertical direction and connected to the outside of the rotating sleeve 110 through a first transverse rod 115. In the first position, the lower end of the rotating sleeve 110 is supported on the stop protrusion 109. After the anti-blocking device of the aeration pipe of the biological tank stops the aeration operation from the aeration operation state, no aeration airflow enters the mounting sleeve 101 from the aeration branch pipe 2 upward. The rotating sleeve 110 falls back to the stop protrusion 109 due to its own weight.

[0028] According to one embodiment of this application, a rotation assist sleeve is connected to the lower end of the air outlet top plate 102. The rotation assist sleeve includes an outer sleeve 112 that is circumferentially disposed on the outside of the lower fixed shaft 108 and an inner sleeve 113 that is rotatably mounted on the inner side of the outer sleeve 112. A ball bearing is provided between the outer sleeve 112 and the inner sleeve 113. The inner side of the inner sleeve 113 is spaced apart from the lower fixed shaft 108. In a second position, the upper end of the rotation sleeve 110 abuts against the lower end of the inner sleeve 113. The rotation of the inner sleeve 113 within the outer sleeve 112 can assist the rotation of the rotation sleeve 110.

[0029] In other embodiments, the rotation assist sleeve may not be provided. In the second position, the upper end of the rotation sleeve 110 can rotate against the lower end of the air outlet plate 102. Preferably, a smooth layer can be provided at the part where the lower end of the air outlet plate 102 contacts the upper end of the rotation sleeve 110.

[0030] According to one embodiment of this application, the upper end of the anti-clogging rod 107 is provided with a sharp blade 114. When the anti-clogging rod 107 rotates and repeatedly passes through each aeration hole 106, the sharp blade 114 can better pry open or cut through the sludge that is about to enter or has already entered the aeration hole 106.

[0031] According to one embodiment of this application, the anti-clogging mechanism includes a top support rod 117 connected to the outside of the rotating sleeve 110 via a second transverse rod 116. The top support rod 117 is arranged vertically, and its upper end face is higher than the upper end face of the anti-clogging rod 107. The anti-clogging device for the aeration pipe of the biological tank includes a movable cover 118 that is movably disposed above the air outlet top plate 102. When the rotation drive unit is stationary in the first position, the top support rod 117 is located below the air outlet top plate 102 and the movable cover 118 is positioned below the air outlet top plate 102. When the annular connecting groove 105 and multiple aeration holes 106 are blocked, and the rotating drive unit is in the second position, the upper end of the top support rod 117 lifts the movable cover 118, thus separating the movable cover 118 from the air outlet top plate 102. The top support rod 117 passes through the annular connecting groove 105 and rotates along the annular connecting groove 105. When the aeration branch pipe 2 inputs an upward aeration airflow to the mounting sleeve 101, the aeration airflow drives the rotating drive unit to rotate and rise, and the upper end face of the top support rod 117 lifts the movable cover 118.

[0032] According to a preferred embodiment of this application, two top support rods 117 are symmetrically connected to the outer side of the rotating sleeve 110 along the radial direction of the rotating sleeve 110, which can better support and lift the movable cover 118.

[0033] According to one embodiment of this application, the movable cover 118 includes a lower cover portion 119 and an annular cover portion 120 disposed above the lower cover portion 119. The shape of the lower cover portion 119 is adapted to the shape of the annular connecting groove 105 and the plurality of aeration holes 106, and the lower cover portion 119 is aligned with the annular connecting groove 105 and the plurality of aeration holes 106 in the vertical direction. When the rotation drive unit is stationary in the first position, the lower cover portion 119 extends into the annular connecting groove 105 and the plurality of aeration holes 106, and the annular cover portion 120 seals the annular connecting groove 105 and the plurality of aeration holes 106.

[0034] According to a preferred embodiment of this application, a roller 121 is installed on the upper end of the top support rod 117. When the rotation drive is in the second position, the roller 121 lifts the movable cover 118. The roller 121 rolls under the movable cover 118 as the rotation drive rotates, which can avoid excessive frictional resistance from the movable cover 118 to the top support rod 117 and also avoid wear on the movable cover 118 and the top support rod 117.

[0035] According to one embodiment of this application, the vent top plate 102 includes an outer top plate 103 located outside the annular connecting groove 105 and an inner top plate 104 located inside the annular connecting groove 105. The outer top plate 103 is connected to the upper end of the mounting sleeve 101, and the upper end of the inner top plate 104 is connected to an upper fixing shaft 122. The upper fixing shaft 122 is connected to the outer wall of the mounting sleeve 101 through a connecting bracket 127.

[0036] According to one embodiment of this application, an mounting ring 123 is movably mounted on the upper fixed shaft 122. The mounting ring 123 is connected to the movable cover 118. A vertical key 124 is provided on the upper fixed shaft 122. The inner side of the mounting ring 123 has a keyway 125 that cooperates with the vertical key 124 for limiting, so that the mounting ring 123 is rotated and limited on the upper fixed shaft 122.

[0037] It should be noted that the above embodiments only illustrate preferred embodiments of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting this application. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the concept of this application, such as combining different features in various embodiments, and these should all fall within the protection scope of this application.

Claims

1. A device for preventing blockage of aeration pipes in a biological treatment tank, characterized in that, The anti-clogging device for the aeration pipes in the biochemical tank includes aeration branch pipes and aeration heads. Multiple aeration branch pipes are sequentially and spaced apart at the bottom of the aeration tank, and multiple aeration heads are sequentially and spaced apart at the upper end of each aeration branch pipe. Each aeration head includes: The mounting sleeve has its axis arranged vertically. The lower end of the mounting sleeve is connected to the upper end of the aeration branch pipe and communicates with the aeration branch pipe. The upper end of the mounting sleeve is provided with an air outlet plate. The air outlet plate has an annular connecting groove and multiple aeration holes. The multiple aeration holes are arranged sequentially and at intervals around the axis of the mounting sleeve. The annular connecting groove passes through each aeration hole so that the multiple aeration holes are sequentially connected. An anti-clogging mechanism is provided, comprising a rotating drive unit disposed within the mounting sleeve and an anti-clogging rod connected to the rotating drive unit. When the aeration branch pipe does not input aeration airflow to the mounting sleeve, the rotating drive unit is stationary in a first position. When the aeration branch pipe inputs upward aeration airflow to the mounting sleeve, the aeration airflow drives the rotating drive unit to rotate and rise to a second position. In the first position, the anti-clogging rod is located below the air outlet top plate. In the second position, the upper end of the anti-clogging rod extends into the annular connecting groove and rotates along the annular connecting groove.

2. The anti-clogging device for the aeration pipe of the biological treatment tank according to claim 1, characterized in that, The anti-blocking mechanism includes a lower fixed shaft connected to the lower end of the air outlet top plate. The lower fixed shaft has a stop protrusion at its lower end. The rotation drive unit includes a rotating sleeve rotatably sleeved on the lower fixed shaft and a plurality of blades disposed on the outside of the rotating sleeve. The anti-blocking rod is arranged vertically and connected to the outside of the rotating sleeve through a first transverse rod. In the first position, the lower end of the rotating sleeve is supported on the stop protrusion.

3. The anti-clogging device for the aeration pipe of the biological treatment tank according to claim 2, characterized in that, The lower end of the air outlet plate is connected to a rotation assist sleeve. The rotation assist sleeve includes an outer sleeve that is circumferentially disposed on the outside of the lower fixed shaft and an inner sleeve that is rotatably installed on the inner side of the outer sleeve. A ball bearing is provided between the outer sleeve and the inner sleeve. The inner side of the inner sleeve is spaced apart from the lower fixed shaft. In the second position, the upper end of the rotation sleeve abuts against the lower end of the inner sleeve.

4. The anti-clogging device for the aeration pipe of the biological treatment tank according to claim 1, characterized in that, The upper end of the anti-blocking rod is provided with a sharp blade.

5. The anti-clogging device for the aeration pipe of the biological treatment tank according to claim 2, characterized in that, The anti-clogging mechanism includes a top support rod connected to the outside of the rotating sleeve via a second transverse rod. The top support rod is arranged vertically, and its upper end face is higher than the upper end face of the anti-clogging rod. The anti-clogging device for the aeration pipe of the biological tank includes a movable cover that is vertically mounted above the air outlet top plate. When the rotation drive unit is stationary in the first position, the top support rod is located below the air outlet top plate, and the movable cover blocks the annular connecting groove and multiple aeration holes. When the rotation drive unit is located in the second position, the upper end of the top support rod lifts the movable cover, thereby spacing the movable cover from the air outlet top plate. The top support rod passes through the annular connecting groove and rotates along the annular connecting groove.

6. The anti-clogging device for the aeration pipe of the biological treatment tank according to claim 5, characterized in that, Two top support rods are symmetrically connected to the outer side of the rotating sleeve along the radial direction of the rotating sleeve.

7. The anti-clogging device for the aeration pipe of the biological treatment tank according to claim 5, characterized in that, The movable cover includes a lower cover portion and an annular cover portion disposed above the lower cover portion. The shape of the lower cover portion is adapted to the shape of the annular connecting groove and the plurality of aeration holes, and the lower cover portion is aligned with the annular connecting groove and the plurality of aeration holes in the vertical direction. When the rotation drive unit is stationary in the first position, the lower cover portion extends into the annular connecting groove and the plurality of aeration holes, and the annular cover portion seals the annular connecting groove and the plurality of aeration holes.

8. The anti-clogging device for the aeration pipe of the biological treatment tank according to claim 5, characterized in that, A roller is installed at the upper end of the top support rod. When the rotation drive is in the second position, the roller lifts the movable cover.

9. The anti-clogging device for the aeration pipe of the biological treatment tank according to claim 8, characterized in that, The vent top plate includes an outer top plate located outside the annular connecting groove and an inner top plate located inside the annular connecting groove. The outer top plate is connected to the upper end of the mounting sleeve, and the upper end of the inner top plate is connected to an upper fixing shaft. The upper fixing shaft is connected to the outer wall of the mounting sleeve through a connecting bracket.

10. The anti-clogging device for the aeration pipe of the biological treatment tank according to claim 9, characterized in that, An installation ring is movably mounted on the upper fixed shaft. The installation ring is connected to the movable cover. A vertical key is provided on the upper fixed shaft. The inner side of the installation ring has a keyway that cooperates with the vertical key for positioning.

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