Farmland drainage device with trash blocking function

Abstract

The application discloses a farmland drainage device with a trash blocking function, which comprises a drainage and replenishment mechanism, a floating mechanism and a position detection mechanism; the replenishment mechanism comprises a water pump, a water delivery pipe I and a water delivery pipe II, and the tail end of the water delivery pipe I is provided with a water suction port; the floating mechanism comprises a main float, a longitudinal connecting rod, a transverse connecting rod I and a transverse connecting rod II; the main float is sleeved on the water suction port; the longitudinal connecting rod and the transverse connecting rod I are connected in a sliding rotary mode; the position detection mechanism comprises a support shell and a guide assembly and a distance measuring sensor arranged in the support shell; the distance measuring sensor is arranged below a rectangular ring and is used for detecting the distance of the up-and-down movement of the rectangular ring. The application simultaneously solves the problems of sucking mud slurry when the water level of the fixed water suction port is high and sucking air when the water level is low.

Description

Technical Field

[0001] This invention relates to the field of agricultural drainage technology, specifically to a farmland drainage device with a pollution interception function. Background Technology

[0002] In agricultural irrigation and drainage management, in order to maintain a suitable water depth in paddy fields, it is usually necessary to set up drainage outlets or install simple pumping and drainage devices at the field ridges. The water intake installation method commonly used in agricultural irrigation and drainage systems is fixed installation.

[0003] However, in long-term unattended applications in paddy fields, if the suction port is placed high above the field bottom to prevent the intake of bottom sediment, the suction port is easily exposed above the water surface or enters the critical submersion depth when the water level drops due to natural evaporation, crop transpiration, or artificial drainage. At this time, small vortices generated on the water surface will carry air into the pipeline, causing pump cavitation. Cavitation not only leads to a sharp reduction in water output, but the micro-jet impact it generates will also cause metal peeling off the impeller surface, severely shortening the pump's lifespan. If the suction port is buried deep in the field bottom to ensure that water can still be pumped at low water levels, under normal water level conditions, the suction port is too close to the bottom sediment. The bottom flow formed when the pump is working will strongly disturb the bottom sediment, causing a large amount of muddy water with high sand content to be sucked into the pump chamber. Hard, fine mud and sand particles impact the impeller and pump casing at high speed with the water flow, causing abrasive wear. This leads to an increase in the impeller inlet ring clearance and a decrease in volumetric efficiency. In addition, long-term pumping of mud and water not only increases the probability of mechanical seal failure but also discharges fertile topsoil containing a large amount of fertilizer from the field, causing degradation of arable land quality. Fixed suction port structures cannot respond to dynamic changes in water level, forcing farmers to make a passive choice between pumping air and pumping mud, which cannot meet the dual requirements of modern water-saving agriculture for long-term equipment operation and precise water and fertilizer retention.

[0004] Therefore, in order to solve the above problems, a more suitable facility that meets the needs of users is needed. Summary of the Invention

[0005] The present invention aims to provide a farmland pumping and drainage device with a pollution interception function. By setting up a water supply and drainage mechanism, a floating mechanism and a position detection mechanism, the water intake can rise and fall synchronously with the water surface, and at the same time solves the problems of fixed water intakes sucking mud when the water level is high and sucking air when the water level is low.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows.

[0007] A farmland drainage device with pollution interception function includes a water supply and drainage mechanism, a floating mechanism, and a position detection mechanism;

[0008] The water supply and drainage mechanism includes a water pump, a first water supply pipe, and a second water supply pipe; the outlet of the water pump is connected to the first water supply pipe, and the end of the first water supply pipe is equipped with a suction port; the inlet of the water pump is connected to the second water supply pipe.

[0009] The floating mechanism includes a main float, a longitudinal link, a transverse link one, and a transverse link two;

[0010] The main float is fitted onto the water inlet; one end of the longitudinal connecting rod is connected to the main float, and the other end is provided with a pin; one end of the transverse connecting rod is provided with a guide groove, and the other end is provided with a pin; the pin is placed inside the guide groove, so that the longitudinal connecting rod and the transverse connecting rod form a sliding and rotating connection.

[0011] The position detection mechanism includes a support housing and a guide assembly and a ranging sensor disposed within the support housing;

[0012] Pin 2 passes through the support shell and is rotatably connected to the support shell. Transverse connecting rod 2 is located inside the support shell. One end of transverse connecting rod 2 is connected to pin 2, and the other end is provided with pin 3.

[0013] The guide assembly includes a guide post 1 and a rectangular ring; the rectangular ring is provided with a guide groove 2, and a pin 3 is located inside the guide groove 2. The guide post 1 is arranged longitudinally, with its lower end connected to the rectangular ring and its upper end extending out of the support shell and slidably connected to the support shell.

[0014] The distance sensor is located below the rectangular ring and is used to detect the distance the rectangular ring moves up and down.

[0015] As a preferred option, two-position four-way reversing valves are installed on water supply pipe one and water supply pipe two to change the direction of water flow in and out.

[0016] When the two-position four-way reversing valve is in working position one, the water supply and drainage mechanism performs the water supply action, the water pump draws water from the pool through water pipe two, and discharges it into the paddy field through water pipe one;

[0017] When the two-position four-way directional valve is in working position two, the water supply and drainage mechanism performs the pumping action. The water pump draws water from the paddy field through water pipe one and discharges it into the water tank through water pipe two.

[0018] Preferably, the position detection mechanism is also equipped with an adjustment component, which includes a friction block, an elastic device, and a height adjustment device.

[0019] The friction block has a concave arc surface that matches the outer surface of the second pin. The elastic device includes a base plate and several springs on the base plate. The upper end of each spring is connected to the friction block, and a spring telescopic rod is sleeved inside each spring. The height adjustment device is connected to the base plate and is used to adjust the height of the friction block.

[0020] Preferably, the height adjustment device includes several threaded rods and a fixing bracket;

[0021] The mounting bracket has through holes corresponding to the threaded rods. The upper end of each threaded rod is connected to the base plate, and the lower end protrudes from the bottom of the support shell and passes through the through hole to connect with the mounting bracket. Two nuts are fitted on each threaded rod, located at the upper and lower ends of the mounting bracket respectively, to lock the position of the threaded rod.

[0022] As a preferred option, a secondary float is also provided on the main float.

[0023] The main float has several longitudinal through slots, and each through slot has a secondary float installed in it. Each secondary float is connected to the mounting base by a connecting rope, and the mounting base is connected to the longitudinal connecting rod.

[0024] The top of the mounting base is provided with a slide groove, in which a slider is slidably mounted. The slider is connected to the inner wall of the slide groove by a compression spring, and the bottom of the slider is connected to the auxiliary float by a connecting rope. A contact switch is also provided below the slider.

[0025] Preferably, a filter device is also provided below the main float;

[0026] The filtration device includes a filter box with an inlet and an outlet. The inlet is connected to the suction port, and the outlet is connected to the paddy field. A rotating shaft is installed inside the filter box, with one end extending out of the filter box and connected to the output end of a waterproof motor. Several partitions are evenly distributed along the circumference of the rotating shaft, and a filter screen is installed between two adjacent partitions.

[0027] As a preferred option, a guide grid cage is also provided on the outer periphery of the main float to intercept floating objects;

[0028] The guide grid cage is set in the paddy field, with its top exceeding the highest water level; the main float is also equipped with guide components adapted to the guide grid cage. The guide components include a support base and a second guide column. The support base is set on the main float, and the second guide column is set on the support base. The second guide column is slidably connected to the guide grid cage, which can limit the longitudinal floating of the main float.

[0029] As a preferred option, an installation bracket is also provided, and the drainage and position detection mechanisms are both mounted on the installation bracket, which is located at the edge of the paddy field.

[0030] Preferably, the bottom of the guide grid cage is provided with anchors.

[0031] Preferably, when the position of the main float exceeds the upper limit threshold set by the position detection mechanism, the water drainage and replenishment mechanism performs a drainage action; when the position of the main float is lower than the lower limit threshold set by the position detection mechanism, the water drainage and replenishment mechanism performs a water replenishment action.

[0032] The present invention has the following beneficial effects:

[0033] 1. This invention uses a sliding fit between the main float and the guide grid cage, which serves as both a fixed barrier to intercept floating objects and a vertical slide rail for the main float. Regardless of changes in the paddy field water level due to irrigation, drainage, or evaporation, the water intake can rise and fall synchronously with the water surface. This design simultaneously solves the problems of fixed water intakes sucking mud when the water level is high and sucking air when the water level is low.

[0034] 2. Because the relative height difference between the water intake and the water surface is constant, its absolute height from the bottom of the field decreases synchronously with the decrease in water level. This avoids the risk of cavitation at low water levels and automatically rises away from the bottom sediment disturbance area at high water levels, ensuring that the sediment content of the discharged water remains low. This effectively slows down the wear process of the drainage and replenishment mechanism, ensures continuous extraction of clear water from the middle layer without sucking in bottom sediment or surface scum, significantly reduces the impurity content of irrigation water, and reduces energy waste of the drainage and replenishment mechanism caused by filter clogging, meeting the requirements of agricultural water conservation for equipment operating efficiency.

[0035] 3. By utilizing the closed-loop linkage between the position detection mechanism and the water replenishment mechanism, drainage is only initiated when the height of the main float exceeds the preset threshold, and water replenishment is initiated when it falls below the threshold. This avoids frequent start-stop of the water replenishment mechanism due to slight fluctuations in the water surface, thus protecting the lifespan of the water replenishment mechanism. Attached Figure Description

[0036] Figure 1 This is one of the overall structural schematic diagrams of an embodiment of the present invention.

[0037] Figure 2 This is the second schematic diagram of the overall structure of an embodiment of the present invention.

[0038] Figure 3 This is a schematic diagram of the structure of a two-position four-way reversing valve according to an embodiment of the present invention.

[0039] Figure 4 This is a schematic diagram of the overall structure of the valve core according to an embodiment of the present invention.

[0040] Figure 5 This is a cross-sectional structural diagram of the valve core according to an embodiment of the present invention.

[0041] Figure 6 This is a schematic diagram of the structure at the top of the main float in an embodiment of the present invention.

[0042] Figure 7 This is a schematic diagram of the structure at the bottom of the main float in an embodiment of the present invention.

[0043] Figure 8 This is a schematic diagram of the internal structure of the filter box in an embodiment of the present invention.

[0044] Figure 9 This is a schematic diagram of the sub-buoy structure in an embodiment of the present invention.

[0045] Figure 10 This is a schematic diagram of the position detection mechanism according to an embodiment of the present invention.

[0046] Figure 11 This is a schematic diagram of the structure of transverse connecting rod one and transverse connecting rod two in an embodiment of the present invention.

[0047] Figure 12 This is a schematic diagram of the adjustment component structure according to an embodiment of the present invention.

[0048] in:

[0049] 1. Water supply and drainage mechanism; 2. Floating mechanism; 3. Position detection mechanism; 4. Filtration device; 5. Guide grid cage; 6. Mounting bracket;

[0050] 11. Water pump; 12. Water supply pipe one; 13. Water supply pipe two; 14. Inlet; 15. Two-position four-way directional valve;

[0051] 151. Valve core; 152. Waterproof motor II; 153. First water delivery channel; 154. Second water delivery channel; 155. Third water delivery channel; 156. Fourth water delivery channel;

[0052] 21. Main float; 22. Longitudinal connecting rod; 23. Lateral connecting rod one; 24. Lateral connecting rod two; 25. Secondary float;

[0053] 221. Pin 1; 231. Guide groove 1; 232. Pin 2; 241. Pin 3; 251. Through groove; 252. Connecting rope; 253. Mounting base; 254. Slide groove; 255. Slider; 256. Compression spring; 257. Contact switch;

[0054] 31. Support housing; 32. Adjustment assembly; 33. Guide assembly; 34. Distance sensor;

[0055] 331. Guide post one; 332. Rectangular ring;

[0056] 321. Friction block; 322. Concave arc surface; 323. Base plate; 324. Spring; 325. Threaded rod; 326. Fixing bracket; 327. Nut;

[0057] 41. Filter box; 42. Rotating shaft; 43. Waterproof motor 1; 44. Partition plate; 45. Filter screen;

[0058] 51. Support base; 52. Guide column two. Detailed Implementation

[0059] The present invention will now be described in further detail with reference to the accompanying drawings and specific preferred embodiments.

[0060] In the description of this invention, it should be understood that the terms "left side," "right side," "upper part," "lower part," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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. "First," "second," etc., do not indicate the importance of the components, and therefore should not be construed as a limitation of this invention. The specific dimensions used in this embodiment are only for illustrating the technical solution and do not limit the scope of protection of this invention.

[0061] like Figures 1-12 As shown, a farmland drainage device with pollution interception function includes a water supply and drainage mechanism 1, a floating mechanism 2, and a position detection mechanism 3.

[0062] The water supply and drainage mechanism 1 includes a water pump 11, a first water supply pipe 12, and a second water supply pipe 13. The outlet of the water pump 11 is connected to the first water supply pipe 12, and the end of the first water supply pipe 12 is provided with a suction port 14, which is placed in the paddy field; the inlet of the water pump 11 is connected to the second water supply pipe 13, which is placed in a water tank.

[0063] Two-position four-way directional valves 15 are installed on water supply pipe 12 and water supply pipe 23 to change the direction of water flow. When the two-position four-way directional valve 15 is in working position one, the water supply and drainage mechanism 1 performs water replenishment, and the water pump 11 draws water from the water tank through water supply pipe 213 and discharges it into the paddy field through water supply pipe 12; when the two-position four-way directional valve 15 is in working position two, the water supply and drainage mechanism 1 performs water pumping, and the water pump 11 draws water from the paddy field through water supply pipe 12 and discharges it into the water tank through water supply pipe 213.

[0064] The floating mechanism 2 includes a main float 21, a longitudinal connecting rod 22, a first transverse connecting rod 23, and a second transverse connecting rod 24. The main float 21 is fitted onto the water inlet 14 of the water supply pipe 12, so that the water inlet 14 floats at a preset position below the water surface and can float up and down with the change of the paddy field water level.

[0065] One end of the longitudinal connecting rod 22 is connected to the main float 21, and the other end is provided with a pin 221; one end of the transverse connecting rod 23 is provided with a guide groove 231, and the other end is provided with a pin 232. The pin 221 is placed inside the guide groove 231 and can slide back and forth along the guide groove 231 and rotate circumferentially relative to the guide groove 231, so that the longitudinal connecting rod 22 and the transverse connecting rod 23 form a sliding and rotating connection.

[0066] The position detection mechanism 3 includes a support shell 31 and an adjustment component 32, a guide component 33 and a distance sensor 34 disposed within the support shell 31.

[0067] Pin 232 passes through the support shell 31 and is rotatably connected to the support shell 31. Transverse connecting rod 24 is located inside the support shell 31. One end of transverse connecting rod 24 is connected to pin 232, and the other end is provided with pin 341. Transverse connecting rod 24 rotates together with pin 232.

[0068] The guide assembly 33 includes a guide post 331 and a rectangular ring 332. A guide groove 2 is provided within the rectangular ring 332, and a pin 341 is located inside the guide groove 2, allowing it to slide back and forth along the guide groove 2 and rotate circumferentially relative to it. The guide post 331 is longitudinally positioned, with its lower end connected to the rectangular ring 332 and its upper end extending from the support shell 31 and slidably connected to it. The guide post 331 provides longitudinal positioning for the rectangular ring 332 and can also indicate the lifting height of the main float 21.

[0069] A ranging sensor 34 is positioned below the rectangular ring 332 to detect the vertical movement distance of the rectangular ring 332. A detector for detecting the rotation angle of the second pin 232 is also provided on the support housing 31.

[0070] The adjusting assembly 32 includes a friction block 321, an elastic device, and a height adjusting device. The friction block 321 has a concave arc-shaped surface 322, which matches the outer surface of the second pin 232. The elastic device includes a base plate 323 and several springs 324 mounted on the base plate 323. The upper end of each spring 324 is connected to the friction block 321, and each spring 324 has a spring telescopic rod fitted inside it. The height adjusting device is connected to the base plate 323 and is used to adjust the height of the friction block 321.

[0071] The height adjustment device is preferably a threaded lifting and locking assembly, comprising several threaded rods 325 and a fixing frame 326. The fixing frame 326 has through holes corresponding to the threaded rods 325. The upper end of each threaded rod 325 is connected to the base plate 323, and the lower end extends from the bottom of the support shell 31, passing through the through holes and connecting to the fixing frame 326. Two nuts 327 are fitted onto each threaded rod 325, located at the upper and lower ends of the fixing frame 326 respectively, to lock the position of the threaded rod 325. In this embodiment, two threaded rods 325 are provided.

[0072] Adjusting the threaded rod 325 upwards causes the concave arc surface 322 of the friction block 321 to press against the outer surface of the second pin 232, which increases the friction between the second pin 232 and the concave arc surface 322. When the water level fluctuates within a certain range, increasing the friction can stabilize the rotation of the second pin 232, thereby keeping the detection signal of the ranging sensor 34 stable and obtaining accurate water level data.

[0073] The main float 21 is also provided with a secondary float 25. Specifically, the main float 21 is provided with a plurality of longitudinal through slots 251 (two through slots 251 are symmetrically arranged in this embodiment), and a secondary float 25 is installed in each through slot 251. Each secondary float 25 is connected to a mounting base 253 by a connecting rope 252, and the mounting base 253 is connected to a longitudinal connecting rod 22. The main float 21 and the secondary float 25 are preferably made of HDPE high-density polyethylene.

[0074] The top of the mounting base 253 is provided with a slide groove 254, and a slider 255 is slidably arranged in the slide groove 254. The slider 255 is connected to the inner wall of the slide groove 254 by a compression spring 256. The bottom of the slider 255 is connected to the auxiliary float 25 by a connecting rope 252. A contact switch 257 is also provided below the slider 255.

[0075] Under normal circumstances, the auxiliary float 25 is located inside the main float 21 and moves with the water level along with the main float 21. When the longitudinal connecting rod 22 and the transverse connecting rod 23 malfunction, such as when sediment particles are stuck relative to the support shell 31 and cannot rotate, preventing the main float 21 from moving down with the water level, the auxiliary float 25 will slide out of the through groove 251. The auxiliary float 25 will drive the slider 255 down through the connecting rope 252, and the slider 255 will press against the contact switch 257, closing the contact switch 257. When the contact switch 257 remains pressed and the distance sensor 34 always detects that the height of the rectangular ring 332 remains unchanged, it can be determined that the longitudinal connecting rod 22 and the transverse connecting rod 23 have malfunctioned, and the staff will then repair the equipment.

[0076] A filter device 4 is also installed below the main float 21. The filter device 4 includes a filter box 41, which has an inlet and an outlet. The inlet is connected to the suction port 14, and the outlet is connected to the paddy field. A rotating shaft 42 is installed inside the filter box 41. The rotating shaft 42 is horizontally positioned, and one end of the rotating shaft 42 extends out of the filter box 41 and is connected to the output end of the waterproof motor 43. Several partitions 44 are evenly distributed along the circumference of the rotating shaft 42, and a filter screen 45 is provided between two adjacent partitions 44.

[0077] When the water draining and replenishing mechanism 1 performs the pumping action, the waterproof motor 43 drives the rotating shaft 42 to rotate, thereby driving the partition 44 and the filter screen 45 to rotate, completing the switching of multiple filter screens 45 and improving the filtration efficiency; when the water draining and replenishing mechanism 1 performs the replenishing action, it draws clean water from the water tank into the filter box 41, which can wash the filter screen 45, remove impurity particles adhering to the filter screen 45, and ensure its filtration performance.

[0078] The main float 21 is also equipped with a guide grid cage 5 around its outer perimeter to intercept floating objects. The guide grid cage 5 is placed in the paddy field, with its top exceeding the highest water level and its bottom equipped with several anchors for secure insertion into the paddy field. The main float 21 is also equipped with guide components adapted to the guide grid cage 5. The guide components include a support base 51 and a second guide post 52. The support base 51 is mounted on the main float 21, and the second guide post 52 is mounted on the support base 51. The second guide post 52 is slidably connected to the guide grid cage 5, which can limit the longitudinal floating of the main float 21.

[0079] This application also includes an installation bracket 6, on which the drainage mechanism and the position detection mechanism 3 are both mounted. The bottom of the installation bracket 6 is provided with several anchors, and the installation bracket 6 is fixed to the edge of the paddy field by the anchors.

[0080] The working principle of this application is as follows: Under the constraint of the guide grid cage 5, the main float 21 moves vertically in response to the rise and fall of the paddy field water level. When the position of the main float 21 exceeds the upper limit threshold set by the position detection mechanism 3, the water drainage and replenishment mechanism 1 performs a drainage action; when the position of the main float 21 is lower than the lower limit threshold set by the position detection mechanism 3, the water drainage and replenishment mechanism 1 performs a water replenishment action. During the process of the main float 21 sliding along the guide grid cage 5, the filter device 4 is always maintained within the preset pumping depth range below the water surface.

[0081] The two-position four-way directional valve 15 specifically includes a valve core 151 and a waterproof motor 152 that controls the rotation of the valve core 151. The valve core 151 has a first water supply channel 153, a second water supply channel 154, a third water supply channel 155, and a fourth water supply channel 156. The first water supply channel 153 is used to connect the first water supply pipe 12 and the inlet of the water pump 11; the second water supply channel 154 is used to connect the second water supply pipe 13 and the outlet of the water pump 11; the third water supply channel 155 is used to connect the second water supply pipe 13 and the inlet of the water pump 11; and the fourth water supply channel 156 is used to connect the first water supply pipe 12 and the outlet of the water pump 11.

[0082] This invention precisely controls the depth of the water layer on the field surface, preventing excessive water replenishment that could cause the water level to overflow the field ridges. This also prevents excess water from flowing away directly, reducing ineffective overflow. Since the vertical seepage rate of the soil at the bottom of the paddy field is proportional to the hydrostatic pressure generated by the water layer depth, water that seeps below the crop root system cannot be absorbed by the roots. Furthermore, this water dissolves nitrogen, phosphorus, and potassium fertilizers in the field and carries them away. By precisely controlling the depth of the water layer on the field surface, the hydrostatic pressure generated by the water layer depth meets the standards for shallow irrigation, reducing the downward movement of gravity water, thereby reducing the frequency of topdressing and preventing water waste.

[0083] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and these equivalent transformations all fall within the protection scope of the present invention.

Claims

1. A farmland drainage device with pollution interception function, characterized in that, This includes a water supply and drainage mechanism, a floating mechanism, and a position detection mechanism; The water supply and drainage mechanism includes a water pump, a first water supply pipe, and a second water supply pipe; the outlet of the water pump is connected to the first water supply pipe, and the end of the first water supply pipe is equipped with a suction port; the inlet of the water pump is connected to the second water supply pipe. The floating mechanism includes a main float, a longitudinal link, a transverse link one, and a transverse link two; The main float is fitted onto the water inlet; one end of the longitudinal connecting rod is connected to the main float, and the other end is provided with a pin; one end of the transverse connecting rod is provided with a guide groove, and the other end is provided with a pin; the pin is placed inside the guide groove, so that the longitudinal connecting rod and the transverse connecting rod form a sliding and rotating connection. A secondary float is also provided on the main float; The main float has several longitudinal through slots, and each through slot has a secondary float installed in it. Each secondary float is connected to the mounting base by a connecting rope, and the mounting base is connected to the longitudinal connecting rod. The top of the mounting base is provided with a slide groove, in which a slider is slidably mounted. The slider is connected to the inner wall of the slide groove by a compression spring, and the bottom of the slider is connected to the auxiliary float by a connecting rope. A contact switch is also provided below the slider. The position detection mechanism includes a support housing and a guide assembly and a ranging sensor disposed within the support housing; Pin 2 passes through the support shell and is rotatably connected to the support shell. Transverse connecting rod 2 is located inside the support shell. One end of transverse connecting rod 2 is connected to pin 2, and the other end is provided with pin 3. The guide assembly includes a guide post 1 and a rectangular ring; the rectangular ring is provided with a guide groove 2, and a pin 3 is located inside the guide groove 2. The guide post 1 is arranged longitudinally, with its lower end connected to the rectangular ring and its upper end extending out of the support shell and slidably connected to the support shell. The distance sensor is located below the rectangular ring and is used to detect the distance the rectangular ring moves up and down.

2. The farmland drainage device with pollution interception function according to claim 1, characterized in that, Two-position four-way reversing valves are installed on water supply pipe one and water supply pipe two to change the direction of water flow in and out; When the two-position four-way reversing valve is in working position one, the water supply and drainage mechanism performs the water supply action, the water pump draws water from the pool through water pipe two, and discharges it into the paddy field through water pipe one; When the two-position four-way directional valve is in working position two, the water supply and drainage mechanism performs the pumping action. The water pump draws water from the paddy field through water pipe one and discharges it into the water tank through water pipe two.

3. A farmland drainage device with pollution interception function according to claim 1, characterized in that, The position detection mechanism is also equipped with an adjustment component, which includes a friction block, an elastic device, and a height adjustment device. The friction block has a concave arc surface that matches the outer surface of the second pin. The elastic device includes a base plate and several springs on the base plate. The upper end of each spring is connected to the friction block, and a spring telescopic rod is sleeved inside each spring. The height adjustment device is connected to the base plate and is used to adjust the height of the friction block.

4. A farmland drainage device with a pollution interception function according to claim 3, characterized in that, The height adjustment device includes several threaded rods and a fixing bracket; The mounting bracket has through holes corresponding to the threaded rods. The upper end of each threaded rod is connected to the base plate, and the lower end protrudes from the bottom of the support shell and passes through the through hole to connect with the mounting bracket. Two nuts are fitted on each threaded rod, located at the upper and lower ends of the mounting bracket respectively, to lock the position of the threaded rod.

5. A farmland drainage device with pollution interception function according to claim 1, characterized in that, A filter device is also installed below the main buoy; The filtration device includes a filter box with an inlet and an outlet. The inlet is connected to the suction port, and the outlet is connected to the paddy field. A rotating shaft is installed inside the filter box, with one end extending out of the filter box and connected to the output end of a waterproof motor. Several partitions are evenly distributed along the circumference of the rotating shaft, and a filter screen is installed between two adjacent partitions.

6. A farmland drainage device with pollution interception function according to claim 1, characterized in that, The outer periphery of the main float is also equipped with a guide grid cage to intercept floating objects; The guide grid cage is set in the paddy field, with its top exceeding the highest water level; the main float is also equipped with guide components adapted to the guide grid cage. The guide components include a support base and a second guide column. The support base is set on the main float, and the second guide column is set on the support base. The second guide column is slidably connected to the guide grid cage, which can limit the longitudinal floating of the main float.

7. A farmland drainage device with pollution interception function according to claim 1, characterized in that, It is also equipped with an installation bracket, on which the drainage and replenishment mechanism and the position detection mechanism are mounted. The installation bracket is located at the edge of the paddy field.

8. A farmland drainage device with a pollution interception function according to claim 6, characterized in that, Anchors are provided at the bottom of the guide grid cage.

9. A farmland drainage device with a pollution interception function according to claim 1, characterized in that, When the position of the main float exceeds the upper limit threshold set by the position detection mechanism, the water drainage and replenishment mechanism performs a drainage action; when the position of the main float is lower than the lower limit threshold set by the position detection mechanism, the water drainage and replenishment mechanism performs a water replenishment action.

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