An agricultural non-point source pollution treatment system based on ecological interception and cyclic purification

Abstract

The present invention belongs to the technical field of wastewater purification, and specifically relates to a farmland wastewater treatment system based on ecological interception and cyclic purification, which includes a wastewater drainage channel and a regulating pond communicated with the wastewater drainage channel; it further includes an interception and filtration mechanism, and the interception and filtration mechanism is installed in the wastewater drainage channel, and the interception and filtration mechanism is used for filtering the wastewater. By setting up the interception and filtration mechanism, on the one hand, through multiple filter pipes arranged in the wastewater drainage channel, the filtration area is enlarged, thereby reducing the probability of the wastewater drainage channel being blocked and ensuring continuous filtration of the farmland wastewater. On the other hand, during the process of the liquid level in the wastewater drainage channel rising, the filter pipes are lifted by the floating plates, so that the filter pipes are always close to the liquid level, thereby reducing the probability of the filter pipes being buried by the solid impurities after filtration, and further reducing the probability of the wastewater drainage channel being blocked.

Description

Technical Field

[0001] The present invention belongs to the technical field of treated wastewater purification, and specifically relates to a farmland treated wastewater treatment system based on ecological interception and cyclic purification. Background Art

[0002] In the field of agricultural planting, due to the use of fertilizers and pesticides in farmland, the treated wastewater from farmland contains relatively high levels of elements such as nitrogen and phosphorus. For crops, the treated wastewater is also fertile water, but for river channels, the treated wastewater becomes sewage, which is extremely likely to cause eutrophication of the river channel water body and become one of the important sources of agricultural non-point source pollution.

[0003] With the prevalence of the concept of environmental protection, the treatment of farmland treated wastewater problems has gradually got on the right track in recent years. Based on the basic principles of "no direct discharge of treated wastewater, no fertile water flowing into the river, and recycling of nutrients", existing low-lying areas are utilized according to local conditions to build a fertile water collection and regulation pond to achieve the treatment policy of no fertile water flowing into the river during the rainy season, reuse for farmland irrigation during the dry season, and nutrient recycling. At the same time, the outlets and channels for treated wastewater are dug and laid between the farmland and the fertile water collection and regulation pond, making the flow path of farmland treated wastewater standardized and fixed, and implementing the treatment of farmland treated wastewater. However, in actual treatment, since the treated wastewater not only contains dissolved elements but also is mixed with solid substances such as sand and soil, during the treatment of treated wastewater, biological interception structures, filtration equipment, etc. are also required to reduce the degree of soil and water loss.

[0004] The related art discloses an efficient ecological interception ditch applicable to dryland farmland, application number: CN202311278375X. The ecological interception ditch proposed in this solution can quickly install an interception mechanism with modular design, which is simple and convenient to operate. And the interception mechanism can be used as a sluice to effectively intercept garbage or weeds in the ditch, which can effectively protect the surrounding water environment and has good environmental protection. However, it is found in the actual application process that due to the large content of soil and debris carried in the farmland treated wastewater during heavy rainfall, during the filtration process, the interception mechanism will be blocked. After the interception mechanism is blocked, not only will the water flow efficiency be reduced, but in severe cases, the water in the channel will even overflow, resulting in the unrestricted flow path of farmland treated wastewater and causing environmental pollution.

[0005] In view of this, the present invention proposes a farmland treated wastewater treatment system based on ecological interception and cyclic purification to solve the above technical problems. Summary of the Invention

[0006] To make up for the deficiencies of the prior art and solve the above technical problems, the present invention proposes a farmland treated wastewater treatment system based on ecological interception and cyclic purification.

[0007] The technical solution adopted by the present invention to solve its technical problems is as follows: A farmland wastewater treatment system based on ecological interception and cyclic purification according to the present invention includes a wastewater drainage canal and a storage tank communicated with the wastewater drainage canal;

[0008] It further includes an interception and filtration mechanism, the interception and filtration mechanism is installed in the wastewater drainage canal, and the interception and filtration mechanism is used for filtering wastewater;

[0009] The interception and filtration mechanism includes an interception gate, a filtration pipeline, a floating plate, and a connecting ring;

[0010] A plurality of interception gates are installed in the wastewater drainage canal, and the plurality of interception gates are uniformly arranged along the length direction of the wastewater drainage canal;

[0011] A filtration pipeline is fixedly installed on two adjacent interception gates in common, and the filtration pipeline is a flexible pipe with micropores on its surface;

[0012] A floating plate is installed in the wastewater drainage canal, and the overall density of the floating plate is less than the density of water;

[0013] A connecting ring is installed at the bottom of the floating plate through a rope, and the connecting ring is sleeved on the filtration pipeline.

[0014] Preferably, the filtration pipelines are provided in plural, and the installation heights of the filtration pipelines on the interception gates are not completely the same.

[0015] Preferably, the floating plates between two adjacent interception gates are all connected in series through steel wires, and both ends of the steel wires are fixedly tied to the interception gates. An annular brush is fixedly installed on the connecting ring, and the annular brush is sleeved on the outer side of the filtration pipeline.

[0016] Preferably, winding rollers are fixedly installed at both ends of the steel wire respectively, a limiting groove is opened on the interception gate, and the winding roller is rotatably installed in the limiting groove in the initial state.

[0017] Preferably, a through groove is opened on the interception gate, a rotating shaft is rotatably installed in the through groove, a plurality of rotating wheels are fixedly installed on the rotating shaft, the opening of the filtration pipeline corresponds to the rotating wheels, and the rotating shaft and the winding roller are in transmission connection through a transmission group.

[0018] Preferably, the transmission group includes a mounting frame, a bidirectional screw, a sliding wheel, a driving wheel, a driven wheel, and a transmission gear ring;

[0019] A transmission groove is opened between the through groove and the limiting groove, and the mounting frame is fixedly installed in the transmission groove;

[0020] The bidirectional screw is rotatably installed on the mounting frame, one end of the bidirectional screw is in belt transmission connection with the rotating shaft, a nut is slidably installed on the mounting frame, the sliding wheel is sleeved on the nut, and the nut is in screw transmission connection with the bidirectional screw;

[0021] The driving gear ring is rotatably installed on the outer wall of the sliding wheel. The driving wheel is installed on the rotating shaft, and the driven wheel is fixedly installed on the winding roller. When the sliding wheel is located between the driving wheel and the driven wheel, the driving gear ring meshes with both the driving wheel and the driven wheel.

[0022] Preferably, in the initial state, the winding directions of the two ends of the same steel wire rope on the winding roller are the same.

[0023] Preferably, a buffer groove is formed in the nut, the sliding wheel extends into the buffer groove, buffer springs are fixedly installed at both ends of the buffer groove, and the sliding wheel is located between the two buffer springs.

[0024] Preferably, the thickness of the driving wheel is greater than that of the driven wheel, and the centers of the driving wheel and the driven wheel are aligned. During the linear movement of the driving gear ring, it first meshes with the driving wheel.

[0025] Preferably, a locking wheel is installed between the driving wheel and the rotating shaft. The locking wheel is fixedly installed on the rotating shaft. A locking groove is formed in the locking wheel, and a tapered tooth is elastically installed in the locking groove through a spring. A mating groove is formed in the driving wheel, and in the initial state, the tapered tooth extends into the mating groove.

[0026] The beneficial effects of the present invention are as follows:

[0027] 1. For the farmland wastewater treatment system based on ecological interception and cyclic purification described in the present invention, by setting up the interception and filtration mechanism, on the one hand, through multiple filter pipes arranged in the wastewater drainage channel, the filtration area is enlarged, thereby reducing the probability of the wastewater drainage channel being blocked and ensuring continuous filtration of the farmland wastewater. On the other hand, during the rising process of the liquid level in the wastewater drainage channel, the floating plate is used to lift the filter pipe, so that the filter pipe is always close to the liquid level, thereby reducing the probability of the filter pipe being buried by the solid impurities after filtration and further reducing the probability of the wastewater drainage channel being blocked. At the same time, after the filtration is completed, the filter pipe finally stops above the solid impurities, which is convenient for the staff to backfill the solid impurities in the wastewater drainage channel and can also prevent the solid impurities from wrapping the filter pipe, thus facilitating the next filtration operation.

[0028] 2. For the farmland wastewater treatment system based on ecological interception and cyclic purification described in the present invention, during the rotation of the runner, through the transmission of the transmission group, the winding roller is driven to rotate. With the lifting effect of the floating plate on the liquid level rise, when the connecting ring moves along the length direction of the filter pipe, the filter pipe is lifted, and finally most of the filter pipe is located above the solid sediment. At the same time, the movement of the connecting ring can also clean the outer wall of the filter pipe, thereby maintaining the filtration effect of the filter pipe and further reducing the probability of the wastewater drainage channel being blocked. Description of the Drawings

[0029] The present invention will be further described below in conjunction with the accompanying drawings.

[0030] Figure 1 is a perspective view of the present invention;

[0031] Figure 2 is an assembled perspective view of the intercepting sluice and the filtering pipeline;

[0032] Figure 3 is an assembled view of the floating plate, the steel wire rope and the wire winding roller;

[0033] Figure 4 is a structural view inside the through groove;

[0034] Figure 5 is a structural view inside the transmission groove;

[0035] Figure 6 is Figure 5 a partial enlarged view at position A in

[0036] Figure 7 is a sectional view of the intercepting sluice;

[0037] Figure 8 is Figure 7 a partial enlarged view at position B in

[0038] In the figure: 1, drainage canal; 2, intercepting sluice; 21, filtering pipeline; 22, floating plate; 23, connecting ring; 24, steel wire rope; 25, annular brush; 26, wire winding roller; 3, limiting groove; 4, through groove; 41, rotating shaft; 42, runner; 5, mounting bracket; 51, transmission groove; 52, bidirectional screw; 53, nut; 54, sliding wheel; 55, transmission gear ring; 56, driving wheel; 57, driven wheel; 6, buffer groove; 61, buffer spring; 62, locking wheel; 63, locking groove; 64, tapered tooth; 65, mating groove. Specific embodiments

[0039] In order to make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0040] As shown in Figures 1 to 8As shown in the figure, a farmland wastewater treatment system based on ecological interception and cyclic purification according to the present invention includes a wastewater drainage channel 1 and a regulating pond communicated with the wastewater drainage channel 1; further includes an interception and filtration mechanism, the interception and filtration mechanism is installed in the wastewater drainage channel 1, and the interception and filtration mechanism is used for filtering the wastewater; the interception and filtration mechanism includes an interception gate 2, a filtration pipeline 21, a floating plate 22, and a connecting ring 23; a plurality of interception gates 2 are installed in the wastewater drainage channel 1, and the plurality of interception gates 2 are uniformly arranged along the length direction of the wastewater drainage channel 1; a filtration pipeline 21 is fixedly installed on the adjacent two interception gates 2, and the filtration pipeline 21 is a flexible pipe with micropores on the surface; a floating plate 22 is installed in the wastewater drainage channel 1, and the overall density of the floating plate 22 is less than the density of water; a connecting ring 23 is installed at the bottom of the floating plate 22 through a rope, and the connecting ring 23 is sleeved on the filtration pipeline 21.

[0041] The filtration pipelines 21 are provided in plural, and the installation heights of the filtration pipelines 21 on the interception gates 2 are not completely the same.

[0042] In the process of treating farmland wastewater, the wastewater drainage channel 1 can divert and converge the farmland wastewater, effectively reducing the inflow of farmland wastewater into areas such as rivers. In order to enhance the filtration effect of the wastewater drainage channel 1 on the farmland wastewater, an interception and filtration mechanism is provided in the wastewater drainage channel 1 of the present invention. On the premise of reducing the blockage probability of the wastewater drainage channel 1, the farmland wastewater is effectively filtered, so that the soil and sundries washed and carried by the farmland wastewater can be retained in the wastewater drainage channel 1 for the convenience of regular backfilling by the staff.

[0043] Specifically, when there is heavy rainfall or during farmland irrigation operations, the excess water in the farmland flows into the drainage canal 1. During the flowing process, the farmland drainage first passes through the ecological interception layer composed of plants arranged on both sides of the drainage canal 1. Under the coarse filtration effect of the ecological interception layer, large-volume sundries in the farmland drainage are intercepted, and the liquid components carry soil and small-particle impurities into the drainage canal 1. Since the drainage canal 1 is divided into multiple sections by multiple intercepting gates 2, the farmland drainage entering the drainage canal 1 surrounds the filter pipes 21. Under the fine filtration of the filter pipes 21, the liquid components (water) in the farmland drainage enter the interior of the filter pipes 21 and flow along the filter pipes 21, eventually flowing into the storage pond, while the solid components stay in the drainage canal 1. During this process, with the continuous accumulation of solid impurities and the continuous inflow of farmland drainage, the liquid level in the drainage canal 1 will gradually rise. During the rising process of the liquid level in the drainage canal 1, the floating plate 22 installed in the drainage canal 1 gradually rises under the buoyancy force. Since the floating plate 22 is connected to the filter pipe 21 through the connecting ring 23, under the pulling effect of the floating plate 22 and the connecting ring 23, the middle part of the filter pipe 21 moves upward. At the same time, since there are multiple filter pipes 21 arranged and their installation heights on the intercepting gate 2 are different, as the liquid level height in the drainage canal 1 rises, the farmland drainage gradually submerges all the filter pipes 21, thereby improving the filtration efficiency of the farmland drainage. When the heavy rainfall or farmland irrigation operation ends, over time, the farmland drainage in the drainage canal 1 is finally completely filtered, causing the solid impurities carried in the farmland drainage to be intercepted in the drainage canal 1. At this time, the solid impurities not only include soil, but also crop fragments, fertilizers, etc., and their nitrogen, phosphorus and other element contents are relatively high. Excavating and backfilling them into the farmland can not only prevent soil erosion in the farmland, but also supplement soil fertility.

[0044] By setting up the interception and filtration mechanism, on the one hand, through multiple filter pipes 21 arranged in the drainage canal 1, the filtration area is enlarged, thereby reducing the probability of the drainage canal 1 being blocked and ensuring the continuous filtration of the farmland drainage. On the other hand, during the rising process of the liquid level in the drainage canal 1, the floating plate 22 is used to lift the filter pipe 21, so that the filter pipe 21 is always close to the liquid level, thereby reducing the probability of the filter pipe 21 being buried by the solid impurities after filtration and further reducing the probability of the drainage canal 1 being blocked. At the same time, after the filtration is completed, the filter pipe 21 finally stays above the solid impurities, which is not only convenient for the staff to backfill the solid impurities in the drainage canal 1, but also can prevent the solid impurities from wrapping the filter pipe 21, thus facilitating the next filtration operation.

[0045] As a preferred embodiment of the present invention, the floating plates 22 between two adjacent intercepting gates 2 are connected in series by steel wire ropes 24, and both ends of the steel wire ropes 24 are fixedly tied to the intercepting gates 2. An annular brush 25 is fixedly installed on the connecting ring 23, and the annular brush 25 is sleeved outside the filtering pipeline 21.

[0046] By using the steel wire ropes 24 to connect multiple floating plates 22 and extending both ends of the steel wire ropes 24 to the intercepting gates 2, in practical applications, the presence of the steel wire ropes 24 can ensure the distribution interval of the floating plates 22, and try to make the floating plates 22 evenly distributed between the two intercepting gates 2. During the filtering process, the staff can also loosen both ends of the steel wire ropes 24 and cooperate with the manual pulling of the steel wire ropes 24 to cause the connecting ring 23 to move on the filtering pipeline 21, thereby cleaning the sundries, mud, etc. adhered to the surface of the filtering pipeline 21 and reducing the probability of the filtering pipeline 21 being blocked by impurities such as soil.

[0047] As a preferred embodiment of the present invention, winding rollers 26 are fixedly installed at both ends of the steel wire rope 24, and a limiting groove 3 is opened on the intercepting gate 2. In the initial state, the winding rollers 26 are rotatably installed in the limiting groove 3.

[0048] In order to further enhance the convenience of the movement of the connecting ring 23 on the filtering pipeline 21, in the present invention, both ends of the steel wire rope 24 are wound by winding rollers 26, and then the winding rollers 26 are installed in the limiting groove 3. When it is necessary to change the position of the connecting ring 23, the staff opens the limiting groove 3 to cause the winding rollers 26 to rotate. The winding rollers 26 wind or loosen the steel wire ropes 24, which not only facilitates adjusting the distribution positions of the connecting ring 23 and the floating plates 22 in the drainage canal 1, but also facilitates moving the connecting ring 23 to clean the outer wall of the filtering pipeline 21.

[0049] As a preferred embodiment of the present invention, a through groove 4 is opened on the intercepting gate 2, a rotating shaft 41 is rotatably installed in the through groove 4, a plurality of rotating wheels 42 are fixedly installed on the rotating shaft 41, the opening of the filtering pipeline 21 corresponds to the rotating wheels 42, and the rotating shaft 41 is in transmission connection with the winding roller 26 through a transmission group.

[0050] In practical applications, when the agricultural return water flows into the return water channel 1, the filtered water flows into the through groove 4 through the filter pipe 21. During the flowing process, the water pushes the runner 42 to rotate. During the rotation of the runner 42, through the transmission of the transmission group, the winding roller 26 is driven to rotate. With the lifting effect of the floating plate 22 on the liquid level rise, when the connecting ring 23 moves along the length direction of the filter pipe 21, the filter pipe 21 is lifted. Eventually, most of the filter pipe 21 is located above the solid sediment. At the same time, the movement of the connecting ring 23 can also clean the outer wall of the filter pipe 21, thereby maintaining the filtering effect of the filter pipe 21 and further reducing the probability of the return water channel 1 being blocked.

[0051] As a preferred embodiment of the present invention, the transmission group includes a mounting frame 5, a bidirectional screw 52, a sliding wheel 54, a driving wheel 56, a driven wheel 57 and a transmission gear ring 55; a transmission groove 51 is formed between the through groove 4 and the limiting groove 3, and the mounting frame 5 is fixedly installed in the transmission groove 51; the bidirectional screw 52 is rotatably installed on the mounting frame 5, one end of the bidirectional screw 52 is belt-drivenly connected to the rotating shaft 41, a nut 53 is slidably installed on the mounting frame 5, the sliding wheel 54 is sleeved on the nut 53, and the nut 53 is in screw transmission connection with the bidirectional screw 52; the transmission gear ring 55 is rotatably installed on the outer wall of the sliding wheel 54, the driving wheel 56 is installed on the rotating shaft 41, the driven wheel 57 is fixedly installed on the winding roller 26, and when the sliding wheel 54 is located between the driving wheel 56 and the driven wheel 57, the transmission gear ring 55 is meshed with both the driving wheel 56 and the driven wheel 57.

[0052] In the initial state, the winding directions of the two ends of the same steel wire rope 24 on the winding roller 26 are the same.

[0053] In the present invention, the drive wheel set is composed of structures such as a mounting bracket 5, a bidirectional screw 52, a sliding wheel 54, a driving wheel 56, a driven wheel 57, and a transmission gear ring 55. When the water flow in the through groove 4 drives the runner 42 to rotate, the runner 42 drives the rotating shaft 41 to rotate. After transmission, the driving wheel 56 and the bidirectional screw 52 are caused to rotate. The nut 53 slidably mounted on the mounting bracket 5 is simultaneously affected by the mounting bracket 5 and the bidirectional screw 52, so that the nut 53 changes from rotation to linear motion. The nut 53 drives the sliding wheel 54 and the transmission gear ring 55 to perform linear motion. When the sliding wheel 54 and the transmission gear ring 55 are located in the gap between the driving wheel 56 and the driven wheel 57, the transmission gear ring 55 meshes with the driving wheel 56 and the driven wheel 57 simultaneously, so that the runner 42 and the winding roller 26 are transmitted. The rotation of the winding roller 26 will cause the steel wire rope 24 to be tightened or loosened. In practical applications, there are the following several situations. The first situation is that the water flow directions in two adjacent through grooves 4 are the same, which makes the rotation directions of the winding rollers 26 the same. Since the winding directions of the two ends of the steel wire rope 24 on the winding roller 26 are the same, the winding roller 26 winds or loosens the two ends of the steel wire rope 24. When both ends of the steel wire rope 24 are wound, the steel wire rope 24 is tightened, producing an upward pulling effect on the floating plate 22. Then, when the transmission gear ring 55 disengages from the gap between the driving wheel 56 and the driven wheel 57, under the action of the gravity of the floating plate 22, the floating plate 22 pulls the steel wire rope 24, so that the winding roller 26 rotates in the reverse direction, and the floating plate 22 pulls the filter pipe 21 to move up and down, reducing the probability of the filter pipe 21 being buried by solid impurities. The first situation is that the water flow directions in two adjacent through grooves 4 are different, which makes the rotation directions of two adjacent winding rollers 26 different, that is, one end of the steel wire rope 24 is loosened and the other end is tightened, so that the floating plate 22 and the connecting ring 23 move in the length direction of the filter pipe 21, which is convenient for cleaning the outer wall of the filter pipe 21. At the same time, with the buoyancy effect of the liquid on the floating plate 22, the probability of the filter pipe 21 being buried can also be reduced.

[0054] As a preferred embodiment of the present invention, a buffer groove 6 is formed in the nut 53, the sliding wheel 54 extends into the buffer groove 6, buffer springs 61 are fixedly installed at both ends of the buffer groove 6, and the sliding wheel 54 is located between the two buffer springs 61.

[0055] The thickness of the driving wheel 56 is greater than that of the driven wheel 57, and the centers of the driving wheel 56 and the driven wheel 57 are aligned. During the linear motion of the transmission gear ring 55, it first meshes with the driving wheel 56.

[0056] When the nut 53 drives the sliding wheel 54 and the transmission gear ring 55 to move linearly, a buffer groove 6 is provided on the nut 53. During the process of the transmission gear ring 55 approaching and engaging with the continuously rotating driving wheel 56, when the driving wheel 56 obstructs the movement of the transmission gear ring 55, the nut 53 continues to move, and the sliding wheel 54 presses the buffer spring 61. As the driving wheel 56 continues to rotate, when the driving wheel 56 matches the transmission gear ring 55, under the action of the buffer spring 61, the transmission gear ring 55 quickly engages with the driving wheel 56, and the sliding wheel 54 moves back to the middle of the buffer groove 6. Subsequently, during the engagement process between the transmission gear ring 55 and the driven wheel 57, the above process is repeated, so that the combination and disengagement process between the transmission gear ring 55 and the driving wheel 56 and the driven wheel 57 during the linear movement are smoother.

[0057] As a preferred embodiment of the present invention, a locking wheel 62 is installed between the driving wheel 56 and the rotating shaft 41. The locking wheel 62 is fixedly installed on the rotating shaft 41. A locking groove 63 is provided on the locking wheel 62. A tapered tooth 64 is elastically installed in the locking groove 63 through a spring. A mating groove 65 is provided on the driving wheel 56. In the initial state, the tapered tooth 64 extends into the mating groove 65.

[0058] In practical applications, for various reasons, the winding roller 26 often cannot rotate. At this time, if the transmission gear ring 55 is located between the driving wheel 56 and the driven wheel 57, and the driven wheel 57 cannot rotate, it will cause the transmission gear ring 55 and the driving wheel 56 to be unable to rotate. At this time, the rotating shaft 41 drives the locking wheel 62 to rotate, so that there is a tendency of relative rotation between the locking wheel 62 and the driving wheel 56. When, under this tendency, the force applied by the rotating shaft 41 to the locking wheel 62 for rotation is greater than the force for the tapered tooth 64 to compress the spring and contract, the tapered tooth 64 contracts into the locking groove 63, so that the locking wheel 62 is separated from the driving wheel 56. At this time, the locking wheel 62 and the driving wheel 56 rotate relatively, thereby reducing the probability of the device being damaged due to overload.

[0059] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A farmland drainage treatment system based on ecological interception and circulation purification, comprising a drainage channel (1) and a storage pond connected to the drainage channel (1); Features: It also includes an intercepting and filtering mechanism, which is installed in the drainage channel (1) and is used to filter the drainage water; The interception and filtration mechanism comprises an interception gate (2), a filtration pipe (21), a floating plate (22), and a connecting ring (23); A plurality of interception gates (2) are installed in the drainage channel (1), and the plurality of interception gates (2) are evenly arranged along the length direction of the drainage channel (1); A filtering pipe (21) is fixedly mounted on two adjacent interception gates (2), and the filtering pipe (21) is a flexible pipe with micropores on its surface; A floating plate (22) is installed in the drainage channel (1), and the overall density of the floating plate (22) is less than the density of water; A connecting ring (23) is installed at the bottom of the floating plate (22) via a rope, and the connecting ring (23) is sleeved on the filtering pipe (21); The floating plates (22) between two adjacent intercepting gates (2) are connected in series via a steel wire rope (24), and winding rollers (26) are fixedly mounted at both ends of the steel wire rope (24); The intercepting gate (2) is provided with a through groove (4), a rotating shaft (41) is rotatably mounted in the through groove (4), a plurality of rotating wheels (42) are fixedly mounted on the rotating shaft (41), the opening of the filtering pipe (21) corresponds to the rotating wheels (42), and the rotating shaft (41) is connected to the winding roller (26) through a transmission group; The transmission group comprises a mounting frame (5), a bidirectional screw rod (52), a sliding wheel (54), a driving wheel (56), a driven wheel (57) and a transmission gear ring (55); A transmission groove (51) is provided between the through groove (4) and the limiting groove (3), and the mounting frame (5) is fixedly mounted in the transmission groove (51); The bidirectional screw (52) is rotatably mounted on the mounting frame (5), one end of the bidirectional screw (52) is connected to the rotating shaft (41) by belt transmission, a nut (53) is slidably mounted on the mounting frame (5), the sliding wheel (54) is sleeved on the nut (53), and the nut (53) is connected to the bidirectional screw (52) by spiral transmission; The transmission gear ring (55) is rotatably mounted on the outer wall of the sliding wheel (54), the driving wheel (56) is mounted on the rotating shaft (41), and the driven wheel (57) is fixedly mounted on the winding roller (26). When the sliding wheel (54) is located between the driving wheel (56) and the driven wheel (57), the transmission gear ring (55) is meshed with the driving wheel (56) and the driven wheel (57).

2. The farmland drainage treatment system based on ecological interception and circulation purification according to claim 1 is characterized by: The filtering pipes (21) are arranged in plural numbers, and the installation heights of the filtering pipes (21) on the intercepting gate (2) are not completely the same.

3. The farmland drainage treatment system based on ecological interception and circulation purification according to claim 1 is characterized by: The two ends of the steel wire rope (24) are fixedly tied to the interception gate (2), and an annular brush (25) is fixedly mounted on the connecting ring (23), and the annular brush (25) is sleeved on the outside of the filtering pipe (21).

4. The farmland drainage treatment system based on ecological interception and circulation purification according to claim 3 is characterized by: The intercepting gate (2) is provided with a limit groove (3), and in an initial state, the winding roller (26) is rotatably installed in the limit groove (3).

5. The farmland drainage treatment system based on ecological interception and circulation purification according to claim 4 is characterized by: In an initial state, the two ends of the same steel wire rope (24) are wound on the winding roller (26) in the same direction.

6. The farmland drainage treatment system based on ecological interception and circulation purification according to claim 5 is characterized by: The nut (53) is provided with a buffer groove (6), the sliding wheel (54) extends into the buffer groove (6), buffer springs (61) are fixedly mounted at both ends of the buffer groove (6), and the sliding wheel (54) is located between the two buffer springs (61).

7. The farmland drainage treatment system based on ecological interception and circulation purification according to claim 6 is characterized by: The thickness of the driving wheel (56) is greater than that of the driven wheel (57), and the middle parts of the driving wheel (56) and the driven wheel (57) are aligned. During the linear motion of the transmission gear ring (55), it first meshes with the driving wheel (56).

8. The farmland drainage treatment system based on ecological interception and circulation purification according to claim 7 is characterized by: A locking wheel (62) is installed between the driving wheel (56) and the rotating shaft (41); the locking wheel (62) is fixedly installed on the rotating shaft (41); a locking groove (63) is provided on the locking wheel (62); a conical tooth (64) is elastically installed in the locking groove (63) by means of a spring; a matching groove (65) is provided on the driving wheel (56); in an initial state, the conical tooth (64) extends into the matching groove (65).

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