CN116139552B - Sedimentation tank for sewage treatment - Google Patents

Abstract

The invention discloses a sedimentation tank for sewage treatment, which belongs to the technical field of sewage treatment, and comprises a tank body with a water inlet and a water outlet, and further comprises: the sedimentation plates are positioned in the box body and provided with upper and lower layers, a plurality of accommodating areas with preset heights are arranged among the sedimentation plates, and the edges of the sedimentation plates are attached to the inner wall of the box body; the sedimentation plate is internally provided with a main channel and a first through hole communicated with the main channel, and the first through hole is arranged on the upper surface of the sedimentation plate; the main channel is communicated with a pipeline capable of being opened and closed, and the lower end of the pipeline extends to the outer side of the box body. The invention can improve the sedimentation speed of the vertical sedimentation equipment and is convenient for discharging impurities.

Description

Sedimentation tank for sewage treatment

technical field

The invention belongs to the technical field of sewage treatment, in particular to a sedimentation tank for sewage treatment.

Background technique

The sedimentation tank is a water purification equipment that uses sedimentation to remove suspended solids in water. It has advection, vertical, radial and other styles. Among them, the advantage of vertical sedimentation equipment is that it occupies less ground space and has a high utilization rate of space. For the filtered sewage, that is, the sewage does not contain large particles of impurities, but only contains small particles of impurities, such as sediment, a vertical sedimentation tank can be used for precipitation. The disadvantage is that the liquid level of the sewage is high, and the precipitated impurities in the sewage All need to fall on the bottom wall, the journey required for sedimentation is long, and the sedimentation speed is slow. Moreover, because the bottom wall area of the vertical sedimentation equipment is small, the accumulation of precipitated impurities will be higher, so it is not easy to discharge the precipitated impurities.

Contents of the invention

Aiming at the problems existing in the prior art, the present invention provides a sedimentation tank for sewage treatment, which has the advantages of improving the sedimentation speed of the vertical sedimentation equipment and facilitating the discharge of impurities, and solves the problem of high liquid level of sewage in the prior art. All the precipitated impurities in the sewage need to fall on the bottom wall, the journey required for sedimentation is long, and the sedimentation speed is slow. Moreover, due to the small area of the bottom wall of the vertical sedimentation equipment, the accumulation of precipitated impurities will be higher, so it is not easy to discharge The problem of precipitated impurities.

The present invention is achieved in this way. A settling box for sewage treatment includes a box body with a water inlet and a water outlet, and also includes: settling plates with upper and lower levels located in the box body, and there are several settling plates between the settling plates. accommodating area with a predetermined height; the inside of the precipitation plate has a main channel and a first through hole communicating with the main channel, and the first through hole is opened on the upper surface of the precipitation plate; the main channel communicates with a An open and closed pipeline, the lower end of which extends to the outside of the box.

As preferred in the present invention, the lower end of the pipeline extends out of the box, the lower end of the pipeline communicates with the impurity collection box through a connecting pipe, and the connecting pipe has a valve.

As preferred in the present invention, the lower surface of the settling plate has several second through holes communicating with the main channel, and the several second through holes are equidistantly distributed.

As preferred in the present invention, an air supply element and/or a liquid supply element are communicated above the pipeline;

There is a third through hole on the outer peripheral surface of the pipeline, the gas supply part and/or liquid supply part enters and exits gas and/or liquid into the pipeline 7, and the gas and/or liquid passes through the third through hole When sprayed, the upper surface and/or lower surface of the settling plate can be scoured.

As preferred in the present invention, the inner cavity of the box is a cylindrical cavity, the pipeline is arranged vertically and coaxially with the inner cavity of the box, the shape of the precipitation plate is spiral, and the The settling plate is arranged around the pipeline;

There are several first through holes arranged in a strip shape, and the several first through holes are arranged equidistantly in a ring shape.

As preferred in the present invention, the sedimentation tank for sewage treatment also includes a rotation drive mechanism for driving the pipeline to rotate; the rotation drive mechanism includes a first motor, and the output end of the first motor is connected with a first Gear: a second gear is fixedly installed on the outer peripheral surface of the pipeline, and the first gear meshes with the second gear.

As preferred in the present invention, the upper edge of the settling plate is provided with a first waste removal channel that communicates with the main channel, and when the pipeline is opened, the settling plate can accumulate on the inner wall of the box when the settling plate rotates once. The precipitated impurities on it are discharged.

As preferred in the present invention, the surface of the inner cavity of the box is provided with several cleaning mechanisms; the cleaning mechanism includes a vertically arranged slide rail, and a slide block is slidably connected to the slide rail, and the slide block is fixed An upper driving rod and a lower driving rod are connected, the lower surface of the upper driving rod is attached to the upper surface of the precipitation plate, and the upper surface of the lower driving rod is attached to the lower surface of the precipitation plate.

As preferred in the present invention, the lower edge of the settling plate is attached to the upper surface of the bottom wall of the box, the lower edge of the settling plate has a second miscellaneous passage, and the second miscellaneous passage and the The main channel is connected.

As preferred in the present invention, the water outlet is provided with a baffle that can be opened and closed. When the baffle is closed at the upper end of the water outlet, the upper surface of the baffle and the upper surface of the bottom wall of the box body flush;

A waterproof pusher is connected to the lower side of the baffle, which is used to push the baffle to open and close;

The settling tank for sewage treatment also includes a control switch, the output end of the control switch is connected to the push member for signal, and when the control switch is touched, the baffle can be driven to open or close.

Compared with the prior art, the beneficial effects of the present invention are as follows:

In the present invention, after the sewage enters the box, it is divided into several accommodation areas. In each accommodation area, the sediment in the sewage can be settled as long as it falls on the upper surface of the sedimentation plate, without falling into the bottom of the box. bottom wall, thus shortening the stroke required for settling and improving settling efficiency. When it is necessary to remove the precipitated impurities on the upper surface of the sedimentation plate, the pipeline is opened, and the sewage near the sedimentation plate flows into the first through hole under the action of gravity, and the precipitated impurities on the upper surface of the sedimentation plate are driven into the first through hole, and then pass through the main channel in turn , the pipeline, and finally discharge the box, and finally close the pipeline, so that other sewage is discharged from the outlet and enters the next treatment process. Since the sewage is separated into several accommodation areas, the sediment accumulation in each accommodation area will not be too high, so the discharge of impurities is also facilitated.

Description of drawings

Fig. 1 is the schematic diagram of the three-dimensional structure of the sedimentation tank for sewage treatment provided by the embodiment of the present invention;

Fig. 2 is a top view structural schematic diagram of a sedimentation tank for sewage treatment provided by an embodiment of the present invention;

Fig. 3 is a schematic cross-sectional structure diagram of part A-A in Fig. 2 provided by an embodiment of the present invention;

Fig. 4 is a structural schematic diagram of a first viewing angle of a precipitation plate and a cleaning mechanism provided by an embodiment of the present invention;

Fig. 5 is an enlarged structural schematic diagram of part B in Fig. 4 provided by an embodiment of the present invention;

Fig. 6 is a schematic diagram of an enlarged structure of part C in Fig. 4 provided by an embodiment of the present invention;

Fig. 7 is a structural schematic diagram of a second viewing angle of a sedimentation plate and a cleaning mechanism provided by an embodiment of the present invention;

Fig. 8 is a schematic diagram of a cutaway structure at the bottom wall of a box provided by an embodiment of the present invention;

FIG. 9 is a schematic diagram of an enlarged structure of part D in FIG. 8 provided by an embodiment of the present invention.

In the figure: 1. Water inlet; 2. Water outlet; 3. Box body; 4. Settling plate; 5. Main channel; 6. First through hole; 7. Pipeline; 71. Connecting pipe; 8. Impurity collection box; 9. Valve; 10. Second through hole; 20. Third through hole; 11. First motor; 12. First gear; 13. Second gear; 14. First miscellaneous discharge channel; 15. Slide rail; 16 , slider; 17, upper lever; 18, lower lever; 19, second miscellaneous channel; 21, baffle; 22, second motor; 23, rotating shaft; 24, eccentric wheel.

Detailed ways

In order to further understand the content, features and effects of the present invention, the following examples are given, and detailed descriptions are given below with reference to the accompanying drawings.

The structure of the present invention will be described in detail below in conjunction with the accompanying drawings.

Please refer to Fig. 1-Fig. 3, a kind of sedimentation box for sewage treatment provided by the embodiment of the present invention includes a box body 3 with a water inlet 1 and a water outlet 2, and also includes: a settling box with upper and lower layers located in the box body 3 plate 4, and there are accommodating areas of several predetermined heights between the settling plates 4 (see FIG. 3); the settling plate 4 has a main channel 5 and a first through hole 6 communicating with the main channel 5 inside, The first through hole 6 is opened on the upper surface of the precipitation plate 4 ; the main channel 5 communicates with an openable and closable pipeline 7 , and the lower end of the pipeline 7 extends to the outside of the box 3 .

In this setting, after the sewage enters the tank 3 from the water inlet 1, it is divided into several accommodation areas. In each accommodation area, the sediment in the sewage can be settled as long as it falls on the upper surface of the sedimentation plate 4. It does not need to fall to the bottom wall of the box body 3, thus shortening the stroke required for sedimentation and improving the sedimentation efficiency. When it is necessary to remove the precipitated impurities on the upper surface of the sedimentation plate 4, the pipeline 7 is opened, and the sewage near the sedimentation plate 4 flows into the first through hole 6 under the action of gravity, and the precipitated impurities on the upper surface of the sedimentation plate 4 are driven into the first through hole 6 , and then pass through the main channel 5 and the pipeline 7 in turn, finally discharge the box body 3, and finally close the pipeline 7, so that other sewage is discharged from the water outlet 2 and enters the next treatment process. Since the sewage is separated into several accommodation areas, the sediment accumulation in each accommodation area will not be too high, so the discharge of impurities is also facilitated.

Further, for the settling plates 4, in one embodiment, several settling plates 4 may be provided, and the settling plates 4 are arranged in a single row or in multiple rows, and the settling plates 4 in the same row are aligned up and down so that An accommodation area is formed between the settling plates 4, and the above purpose can be achieved through this arrangement.

In another embodiment, please refer to FIG. 3 and FIG. 4 , the inner cavity of the box body 3 is a cylindrical cavity, the pipeline 7 is vertically arranged, and is coaxial with the inner cavity of the box body 3 Set, the shape of the precipitation plate 4 is spiral, and the precipitation plate 4 is arranged around the pipeline 7 .

Through this setting, on the one hand, when the sewage is injected, the sewage can rotate and move down on the sedimentation plate 4, thereby cleaning the upper surface of the sedimentation plate 4 from top to bottom, and can play a flushing role every time sewage is injected; on the other hand, This setting takes up less horizontal space.

It should be noted that the ratio of the screw pitch to the outer diameter of the usual precipitation plate 4 is 1:1-2, but in this configuration, the ratio of the screw pitch to the outer diameter of the precipitation plate 4 is 1:4-10. When the ratio of the pitch to the outer diameter is higher than 1:4, the pitch of the sedimentation plate 4 is larger at this time, and the inclination of the precipitation plate 4 is larger, and the precipitated impurities on the precipitation plate 4 are easy to slide down. When the ratio of the pitch to the outer diameter is lower than 1:10, the pitch is too small at this time, so that the height of the accommodation area is small. On the one hand, the time required for sedimentation cannot be significantly reduced; Aspects such as process and technology will cause waste, and in subsequent settings, the energy consumption of driving the precipitation plate 4 to rotate increases. When the ratio of the pitch to the outer diameter of the precipitation plate 4 is 1:4-10, the height of the accommodation area is moderate, and the precipitated impurities on the precipitation plate 4 are not easy to slide down.

Further, the edge of the precipitation plate 4 is attached to the inner wall of the box body 3 . If there is a gap between the settling plate 4 and the inner wall of the box body 3, the sediment in the gap will fall to the bottom wall of the box body 3, and the stroke will be longer, which is not conducive to increasing the sedimentation speed. Therefore, sticking the edge of the precipitation plate 4 to the inner wall of the box body 3 can solve this problem. Moreover, the upper surface of the precipitation plate 4 can be set as a non-smooth surface (such as a frosted surface) to prevent the precipitated impurities from sliding down.

Please refer to FIG. 1 and FIG. 3 , the lower end of the pipeline 7 extends out of the box body 3 , and the lower end of the pipeline 7 communicates with the impurity collection box 8 through a connecting pipe 71 with a valve 9 on the connecting pipe 71 .

Through this setting, the opening and closing of the pipeline 7 can be controlled by opening and closing the valve 9. When the precipitation is over, the valve 9 is opened, and the water in the box 3 can drive the precipitated impurities on the precipitation plate 4 to enter the first through hole 6. , and then enter the impurity collection box 8 through the main channel 5, the pipeline 7 and the connecting pipe 71 in sequence, and then close the valve 9 to complete the discharge of the impurities. Preferably, there are several impurity collection boxes 8, which can accommodate more impurities. In actual implementation, the pipeline 7 and the connecting pipe 71 can be connected through a pump (such as a sludge pump), so as to generate suction to the pipeline 7 and facilitate the discharge of precipitated impurities.

For example, please refer to FIG. 3 and FIG. 4 , there are several first through holes 6 arranged in a strip shape, and the several first through holes 6 are arranged equidistantly in a ring shape. On the one hand, even if the precipitated impurities on the upper surface of the precipitation plate 4 slide down, they will slide down into the first through hole 6 and then enter into the main channel 5 . On the other hand, it is also convenient for the subsequent cleaning mechanism to move the precipitated impurities on the precipitation plate 4 into the first through hole 6, thereby facilitating the discharge of the precipitated impurities.

Please refer to FIG. 4 and FIG. 5 , the lower surface of the settling plate 4 has a plurality of second through holes 10 communicating with the main channel 5 , and the plurality of second through holes 10 are equidistantly distributed.

Through this setting, in a holding area, while the sedimented impurities in the sewage sink, the floating impurities in the sewage will float up to the lower surface of the upper layer of sedimentation plate 4, and when the pipeline 7 is opened to discharge the sediment, the water flow can also Drive the floating impurities into the main channel 5 through the second through hole 10, and then discharge through the lower end of the pipeline 7. Through this setting, not only precipitated impurities can be removed, but also floating impurities can be removed. In addition, since the floating impurities only need to float up in the containment area, the stroke of floating is smaller, so the speed of removing the floating impurities can be increased.

It should be noted that when the width dimension of the first through hole 6 and the second through hole 10 is relatively large (the ratio of the length dimension to the width dimension is below 10:1), the second through hole 10 and the first through hole The through holes 6 are distributed in a staggered manner, or there is a partial misalignment between the two, so that a large amount of precipitated impurities will not pass through the first through holes 6 and the second through holes 10 in turn and fall into the next containing interval, and will not A large amount of floating matter and impurities pass through the second through hole 10 and the first through hole 6 in sequence and float up to the previous accommodation area, thereby limiting the movement space of sediment and floating matter in the accommodation area.

Of course, when the width dimension of the first through hole 6 and the second through hole 10 is small (the ratio of the length dimension to the width dimension is above 10:1), in order to facilitate the processing of the first through hole 6 and the second through hole 10 It is also possible to align the two, because the width of the first through hole 6 and the second through hole 10 is small, and the amount of impurities passing through is within the process requirements and will not affect the operation.

Further, an air supply element and/or a liquid supply element (not shown in the figure) communicates above the pipeline 7 .

With this arrangement, firstly, the dissolved flocculant can be directly injected into each accommodation area through the pipeline 7, so as to improve the injection efficiency of the flocculant. Second, the first through hole 6 and the second through hole 10 can be backwashed to prevent clogging. Thirdly, gas can be supplied to the pipeline 7 through the gas supply part, so that the gas can be discharged from the first through hole 6, so that the floating speed of the floating objects can be increased (applicable to the case where the precipitated impurities have been discharged). In specific implementation, the air supply element or the liquid supply element can be provided separately, or the air supply element and the liquid supply element can be provided, and the two communicate with the upper end of the pipeline 7 through the switching valve. The air supply and liquid supply can be set as high-pressure or common liquid pumps or air pumps according to the needs of the distance, and will not be repeated here.

The outer peripheral surface of the pipeline 7 has a third through hole 20, and the third through hole 20 is provided with a one-way valve, which allows the fluid to flow into the cavity through the pipeline 7 and prevents the fluid in the cavity from flowing into the pipeline 7. The gas supply part and/or liquid supply part enters and exits the gas and/or liquid into the pipeline 7, and when the gas and/or liquid is ejected from the third through hole 20, it can wash the upper surface of the precipitation plate 4. surface and/or subsurface. In a specific implementation, the third through hole 20 can be inclined in different directions, so as to increase the cleaning area.

Please refer to Fig. 1 and Fig. 3, this device also includes a rotation drive mechanism for driving the rotation of the pipeline 7; the rotation drive mechanism includes a first motor 11, and the output end of the first motor 11 is connected with a first Gear 12; a second gear 13 is fixedly installed on the outer peripheral surface of the pipe 7, and the first gear 12 and the second gear 13 mesh.

For example, if the output end of the first motor 11 is connected to the first gear 12 by transmission, the output end of the first motor 11 is connected to the first gear 12 through a gearbox. Through this arrangement, on the one hand, the pipeline 7 and the sedimentation plate 4 can be driven to rotate, and on the other hand, the connection between the upper end of the pipeline 7 and the air supply element and/or liquid supply element through the pipeline 7 will not be hindered.

The advantage that precipitation plate 4 rotates is:

First, brushes can be arranged on the edge of the sedimentation plate 4, so that when the sedimentation plate 4 rotates, the inner wall of the box body 3 can be cleaned. Please refer to Fig. 4-Fig. 6, the upper edge of settling plate 4 is provided with the first miscellaneous channel 14 that communicates with described main channel 5, under the situation of opening pipeline 7, when settling plate 4 rotates a circle, can gather in The precipitated impurities between the inner wall of the box body 3 and the edge of the sedimentation plate 4 are discharged. Moreover, it is also convenient to discharge the impurities on the inner wall cleaned by the brush. Preferably, the output volume ratio of the first through hole 6 : the second through hole 10 : the first miscellaneous discharge channel 14 is 4:2:1. Through this setting, when discharging various impurities, the discharge of sewage can be reduced.

Second, a cleaning mechanism can be set on the inner wall of the box body 3, and through the rotation of the sedimentation plate 4, the precipitated impurities on the sedimentation plate 4 and/or the floating objects under the sedimentation plate 4 can be moved into the first through hole 6 or the second through hole 6. Through hole 10. For example:

Please refer to Fig. 5 and Fig. 7, described clearing mechanism comprises the slide rail 15 that has vertical arrangement, described slide rail 15 is slidably connected with slide block 16, and described slide block 16 is fixedly connected with upper lever 17 and lower The driving rod 18, the lower surface of the upper driving rod 17 is attached to the upper surface of the precipitation plate 4, and the upper surface of the lower driving rod 18 is attached to the lower surface of the precipitation plate 4.

Through this arrangement, when the impurities are discharged, the precipitation plate 4 is driven to rotate, so that the upper driving lever 17 moves the impurities on the upper surface of the precipitation plate 4 into the first through hole 6, and the lower driving lever 18 pushes the precipitation plate 4 Impurities on the lower surface are moved into the second through hole 10, thereby facilitating the discharge of impurities.

The upper lever 17 and the lower lever 18 can be made of materials such as rubber that are easy to deform and reset, or the main body of the lever is made of rigid material, and the part that fits the precipitation plate 4 is made of rubber that is easy to deform and reset. Further, a vertical chute is provided on the surface of the inner cavity of the box body 3 , and the slider 16 and the slide rail 15 are both arranged in the chute, so that the adhesion between the precipitation plate 4 and the inner cavity surface of the box body 3 will not be hindered.

Referring to Fig. 3 and Fig. 7, the lower edge of the settling plate 4 is attached to the upper surface of the bottom wall of the box body 3, and the lower edge of the settling plate 4 has a second miscellaneous channel 19, the second The miscellaneous passage 19 communicates with the main passage 5, and by rotating the settling plate 4, the impurities on the upper surface of the bottom wall of the box body 3 can be discharged, and the upper surface of the bottom wall of the box body 3 can also be cleaned.

Further, please refer to FIG. 8 and FIG. 9, the water outlet 2 is provided with a baffle 21 that can be opened and closed. When the baffle 21 is closed on the upper end of the water outlet 2, the baffle 21 The surface is flush with the upper surface of the bottom wall of the box body 3;

The lower side of the baffle 21 is connected with a waterproof pusher for pushing the baffle 21 to open and close;

The settling tank for sewage treatment also includes a control switch, the output terminal of the control switch is connected to the push member for signal, and when the control switch is touched, the baffle 21 can be driven to open or close.

Through this setting, when cleaning the precipitated impurities on the upper surface of the bottom wall of the box body 3 at the lower edge of the precipitation plate 4, due to the setting of the baffle plate 21, the precipitated impurities will not fall into the water outlet 2, and when the precipitation plate 4 rotates a circle, the cleaning is completed. At this time, the control switch is toggled, so that the pusher pushes the baffle 21 to open, and now the sewage after the sedimentation has been removed can be discharged from the water outlet 2.

For example, the pusher includes a second motor 22, a rotating shaft 23 and an eccentric wheel 24, the second motor 22 is fixedly connected to the outside of the water outlet 2, one end of the rotating shaft 23 and the second motor 22 The output end is fixedly connected, the rotating shaft 23 is connected to the water outlet 2 through a sealed bearing, and the other end of the rotating shaft 23 extends to the outside of the water outlet 2, and the eccentric wheel 24 is fixedly connected to the rotating shaft 23 . The second motor 22 drives the eccentric wheel 24 to rotate through the rotating shaft 23, thereby pushing the baffle plate 21 upwards. tilt.

For example, the control switch setting can be a contact control switch, which is arranged on the upper surface of the bottom wall of the box body 3 or the bottom wall of the box body 3. When the precipitation plate 4 rotates 360 °, the impurities on the bottom wall of the box body 3 can be removed. After cleaning, the settling plate 4 touches the control switch, so that the baffle plate 21 is opened to discharge the sewage.

Working principle of the present invention:

The first step is to close the water outlet 2 and open the water inlet 1. The sewage enters the box body 3 from the water inlet 1, and slides down the spiral along the sedimentation plate 4 until it is poured into the predetermined volume of the box body. At this time, the sewage is Separated in several containment areas;

In the second step, the lower end of the pipeline 7 is closed by closing the valve 9, and then the flocculant in a liquid state is poured from the upper end of the pipeline 7, and the flocculant passes through the first through hole 6, the second through hole 10 and the third through hole 20 poured into the containment area;

The third step is to start settling. In each holding area, the settling in the sewage can be completed as long as it falls on the upper surface of the settling plate 4, without falling to the bottom wall of the box body 3, thus shortening the time required for settling. Stroke, improve the sedimentation efficiency;

In the fourth step, when it is necessary to remove the precipitated impurities on the upper surface of the precipitation plate 4, the pipeline 7 is opened, and the sewage near the precipitation plate 4 flows into the first through hole 6 under the action of gravity, and drives the precipitated impurities on the upper surface of the precipitation plate 4 into the first through hole 6. A through hole 6, then through the main channel 5 and the pipeline 7 in turn, and finally discharge the box 3;

The fifth step is to close the pipeline 7, open the water outlet 2, and discharge the settled sewage from the water outlet 2.

It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is a relationship between these entities or operations. There is no such actual relationship or order between them. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications and substitutions can be made to these embodiments without departing from the principle and spirit of the present invention. and modifications, the scope of the invention is defined by the appended claims and their equivalents.

Claims (9)

1. The utility model provides a sedimentation tank for sewage treatment, includes box (3) that have water inlet (1) and delivery port (2), its characterized in that still includes: a sedimentation plate (4) which is positioned in the box body (3) and provided with an upper layer and a lower layer, and a plurality of containing areas with preset heights are arranged among the sedimentation plates (4); the sedimentation plate (4) is internally provided with a main channel (5) and a first through hole (6) communicated with the main channel (5), and the first through hole (6) is arranged on the upper surface of the sedimentation plate (4); the main channel (5) is communicated with an openable pipeline (7), and the lower end of the pipeline (7) extends to the outer side of the box body (3);

the lower surface of the sedimentation plate (4) is provided with a plurality of second through holes (10) communicated with the main channel (5), and the second through holes (10) are distributed at equal intervals.

2. A settling tank for sewage treatment as claimed in claim 1, wherein:

the lower end of the pipeline (7) extends out of the box body (3), the lower end of the pipeline (7) is communicated with an impurity collecting box (8) through a connecting pipe (71), and a valve (9) is arranged on the connecting pipe (71).

3. A settling tank for sewage treatment as claimed in claim 1, wherein:

an air supply piece and/or a liquid supply piece are/is communicated above the pipeline (7);

the outer peripheral surface of the pipeline (7) is provided with a third through hole (20), and the gas supply piece and/or the liquid supply piece can input and output gas and/or liquid into the pipeline (7), and when the gas and/or the liquid is sprayed out of the third through hole (20), the upper surface and/or the lower surface of the sedimentation plate (4) can be flushed.

4. A settling tank for sewage treatment as claimed in claim 1, wherein:

the inner cavity of the box body (3) is a cylindrical cavity, the pipeline (7) is vertically arranged and is coaxial with the inner cavity of the box body (3), the sedimentation plate (4) is a spiral blade (41), and the spiral blade (41) is arranged on the pipeline (7) in a surrounding mode;

the first through holes (6) are in a plurality of shapes and are arranged in a strip shape, and the first through holes (6) are arranged in an annular equidistant mode.

5. A settling tank for sewage treatment as claimed in claim 4, wherein:

the sedimentation tank for sewage treatment further comprises a rotation driving mechanism for driving the pipeline (7) to rotate; the rotary driving mechanism comprises a first motor (11), and the output end of the first motor (11) is in transmission connection with a first gear (12); the outer peripheral surface of the pipeline (7) is fixedly provided with a second gear (13), and the first gear (12) is meshed with the second gear (13).

6. A settling tank for sewage treatment as in claim 5, wherein:

the upper edge of the spiral blade (41) is provided with a first impurity discharging channel (14) communicated with the main channel (5), and under the condition that the pipeline (7) is opened, the spiral blade (41) can discharge the precipitated impurities accumulated on the inner wall of the box body (3) when rotating for one circle.

7. A settling tank for sewage treatment as in claim 6, wherein:

the surface of the inner cavity of the box body (3) is provided with a plurality of cleaning mechanisms; the cleaning mechanism comprises a sliding rail (15) with a vertical setting, a sliding block (16) is connected to the sliding rail (15) in a sliding mode, an upper deflector rod (17) and a lower deflector rod (18) are fixedly connected to the sliding block (16), the lower surface of the upper deflector rod (17) is attached to the upper surface of the helical blade (41), and the upper surface of the lower deflector rod (18) is attached to the lower surface of the helical blade (41).

8. A settling tank for sewage treatment as claimed in claim 4, wherein:

the lower edge of the spiral blade (41) is attached to the upper surface of the bottom wall of the box body (3), the lower edge of the spiral blade (41) is provided with a second impurity discharging channel (19), and the second impurity discharging channel (19) is communicated with the main channel (5).

9. A settling tank for sewage treatment as claimed in claim 1, wherein:

the water outlet (2) is provided with a baffle (21) which can be opened and closed, and when the baffle (21) is closed at the upper end of the water outlet (2), the upper surface of the baffle (21) is flush with the upper surface of the bottom wall of the box body (3);

the lower side of the baffle plate (21) is connected with a waterproof pushing piece for pushing the baffle plate (21) to open and close;

the sedimentation tank for sewage treatment further comprises a control switch, wherein the output end of the control switch is in signal connection with the pushing piece, and when the control switch is triggered, the baffle (21) can be driven to be opened or closed.

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