A farmland irrigation device for purifying and dewatering water

Abstract

This invention discloses a farmland irrigation device for purifying drained water, comprising a primary treatment component. The primary treatment component includes a coarse filter connected to a first inlet pipe and a first reaction mechanism. The coarse filter and the first reaction mechanism are connected via a first connecting pipe, on which a first delivery pump is installed. The first reaction mechanism includes a first reaction tank with a first dosing structure. A secondary treatment component includes a second reaction tank connected to a first outlet via a second connecting pipe. The second connecting pipe is equipped with a second delivery pump and a second dosing structure. The second reaction tank has a second outlet and a second drain outlet. The second outlet is connected to a purifier, which is connected to an outlet pipe. This invention can treat drained water multiple times to meet farmland irrigation water standards, enabling the utilization of drained water and reducing water waste.

Description

Technical Field

[0001] This invention relates to the field of drainage water purification, and in particular to a farmland irrigation device for purifying drainage water. Background Technology

[0002] Coal drain water is wastewater that flows out of the coal seam during the coal mining process. It has high hardness, mineralization, iron and manganese content, and may also contain a large amount of inorganic suspended solids. However, its COD, microbial and total dissolved solids content are generally low, and the output is often large. It is a type of wastewater with high reuse value. Rational utilization of drain water can save water resources. Using drain water for agricultural irrigation is one of the important utilization methods. However, drain water cannot be directly used to irrigate crops and needs to be purified. Therefore, a farmland irrigation device for purifying drain water is proposed to solve the above problems. Summary of the Invention

[0003] The purpose of this invention is to provide a farmland irrigation device for purifying drained water, so as to solve the problems existing in the prior art and purify the drained water to irrigate farmland.

[0004] To achieve the above objectives, the present invention provides the following solution: The present invention provides a farmland irrigation device for purifying and draining water, comprising:

[0005] A primary treatment component includes a coarse filter connected to a first inlet pipe and a first reaction mechanism. The coarse filter and the first reaction mechanism are connected by a first connecting pipe, on which a first delivery pump is installed. The first reaction mechanism includes a first reaction tank with a first dosing structure, a first outlet, and several first sewage discharge holes.

[0006] The secondary treatment component includes a second reaction tank, which is connected to the first outlet via a second connecting pipe. A second delivery pump and a second dosing structure are installed on the second connecting pipe. The second reaction tank has a second outlet and a second sewage outlet. The second outlet is connected to a purifier, which is connected to an outlet pipe.

[0007] Preferably, the first dosing structure includes a first liquid tank, a first sealing cover detachably connected to the first liquid tank, a delivery pipe connected to the first liquid tank, a water pump installed on the delivery pipe, a plurality of branch pipes connected to the end of the delivery pipe away from the first liquid tank, a plurality of spray pipes connected to the branch pipes, the delivery pipe extending into the first reaction tank, a mounting frame fixedly connected to the first reaction tank, the first liquid tank and the water pump fixedly connected to the mounting frame, and a water source connected to the first liquid tank.

[0008] Preferably, a mesh plate is fixedly connected inside the first reaction tank, and several sleeves are rotatably connected to the mesh plate. A worm gear is rotatably connected inside the first reaction tank and extends out of the first reaction tank. An mounting plate is fixedly connected outside the first reaction tank, and a first motor is fixedly connected to the mounting plate. The first motor is driven by the worm gear. A turbine is fixedly connected to the sleeve, and the worm gear meshes with the turbine. The branch pipe extends into the sleeve, and several blades are fixedly connected to the outer edge of the sleeve. The blades are correspondingly arranged with the spray pipe.

[0009] Preferably, a first gear is fixedly connected to the output end of the first motor, and a second gear is fixedly connected to the worm gear. The first gear meshes with the second gear, and the sleeve and the mesh plate are rotatably connected by bearings.

[0010] Preferably, a plurality of guide plates are elastically connected inside the first reaction tank. The guide plates are located on both sides of the first drain hole and are inclined. A plurality of second motors are provided outside the first reaction tank. The second motors are fixedly connected to a base, which is fixedly connected to the ground. A rotating shaft is fixedly connected to the output end of the second motor. The rotating shaft extends into the first reaction tank, and the rotating shaft and the guide plates are connected by a transmission mechanism.

[0011] Preferably, the transmission mechanism includes a first disk and a second disk. The first disk is fixedly connected to the rotating shaft. A plurality of first protrusions are fixedly connected to the first disk. The plurality of first protrusions are circumferentially arranged on the first disk. Each first protrusion has a first inclined surface and a first vertical surface. The second disk is fixedly connected to the guide plate through a connecting block. A plurality of second protrusions are fixedly connected to the second disk. The plurality of second protrusions are circumferentially arranged on the second disk. Each second protrusion has a second inclined surface and a second vertical surface. The first inclined surface abuts against the second inclined surface.

[0012] Preferably, the guide plate and the first reaction tank are elastically connected by a plurality of first springs, a plurality of top plates are fixedly connected inside the first reaction tank, and a second spring is fixedly connected to the top plate, with the end of the second spring away from the top plate being fixedly connected to the second disc.

[0013] Preferably, the second dosing structure includes a second medicine tank, a second sealing cap is detachably connected to the second medicine tank, the second medicine tank is connected to the second connecting pipe through a third connecting pipe, a one-way valve is installed on the third connecting pipe, and the second medicine tank is connected to a water source.

[0014] Preferably, a filter layer, a first baffle plate, and a second baffle plate are fixedly connected inside the second reaction tank. The filter layer, the first baffle plate, and the second baffle plate are arranged vertically in sequence. The first baffle plate has a plurality of first through holes, which are inverted conical in shape. A plurality of connecting rods are fixedly connected inside the first through holes, and a conical cap is fixedly connected to the connecting rods. The second baffle plate has a plurality of second through holes, which are tortuous in shape. A plurality of traction ropes are fixedly connected inside the second through holes, and a float is fixedly connected to the traction ropes. The connection position between the second connecting pipe and the second reaction tank is located below the second baffle plate.

[0015] Preferably, the second water outlet and the purifier are connected by a fourth connecting pipe, a third delivery pump is installed on the fourth connecting pipe, and the first sewage outlet is connected to a filter press.

[0016] This invention discloses the following technical effects: In this device, drained water enters a coarse filter through a first inlet pipe. The coarse filter is used to filter out larger impurities in the drained water. The drained water filtered by the coarse filter enters a first reaction tank through a first delivery pump. A first dosing structure adds chemicals to precipitate suspended solids in the drained water. Chemicals that precipitate calcium and magnesium ions can also be added. The drained water after the first treatment is sent to a second reaction tank through a second delivery pump. Chemicals are added through a second dosing structure, and the chemicals enter the second reaction tank with the water flow, further purifying the drained water, for example, removing substances such as iron, manganese, and phosphorus. The drained water after the second treatment flows out through a second outlet and enters a purifier. The purifier is a conventional purifier, further improving water quality. The purified water is discharged through an outlet pipe and can be used for irrigation of farmland. This invention can treat drained water multiple times to meet the standards for farmland irrigation water, utilizing the drained water and reducing water waste. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the farmland irrigation device for purifying and draining water according to the present invention.

[0019] Figure 2 for Figure 1 A magnified view of part 'a';

[0020] Figure 3 for Figure 1 A magnified view of part b;

[0021] Figure 4 for Figure 1 A magnified view of part of c;

[0022] Figure 5 for Figure 1 A magnified view of part d;

[0023] The components include: 1. Coarse filter; 2. First inlet pipe; 3. First connecting pipe; 4. First transfer pump; 5. First reaction tank; 6. First outlet; 7. First drain hole; 8. Second reaction tank; 9. Second connecting pipe; 10. Second transfer pump; 11. Second outlet; 12. Second drain hole; 13. Purifier; 14. Outlet pipe; 15. First chemical tank; 16. Transfer pipe; 17. Water pump; 18. Branch pipe; 19. Spraying pipe; 20. Mounting frame; 21. Mesh plate; 22. Sleeve; 23. Worm gear; 24. Mounting plate; 25. First motor; 26. Turbine; 27. Blade; 28. First... 29. Gear; 30. Second gear; 31. Bearing; 32. Guide plate; 33. Second motor; 34. Shaft; 35. First disc; 36. Second disc; 37. First protrusion; 38. Connecting block; 39. Fourth connecting pipe; 40. Third delivery pump; 41. Second protrusion; 42. First spring; 43. Top plate; 44. Second spring; 45. Second liquid tank; 46. One-way valve; 47. Filter layer; 48. First baffle plate; 49. Second baffle plate; 50. First through hole; 51. Connecting rod; 52. Conical cover; 53. Second through hole; 54. Traction rope; 55. Float; 56. Filter press. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] Reference Figure 1-5 This invention provides a farmland irrigation device for purifying drained water, comprising:

[0027] The primary treatment component includes a coarse filter 1, a first inlet pipe 2 connected to the coarse filter 1, a first reaction mechanism connected to the coarse filter 1, the coarse filter 1 and the first reaction mechanism connected by a first connecting pipe 3, a first delivery pump 4 installed on the first connecting pipe 3, the first reaction mechanism includes a first reaction tank 5, a first dosing structure provided on the first reaction tank 5, a first outlet hole 6 and several first sewage discharge holes 7 provided on the first reaction tank 5;

[0028] The secondary treatment component includes a second reaction tank 8, which is connected to the first outlet 6 via a second connecting pipe 9. A second delivery pump 10 is installed on the second connecting pipe 9, and a second dosing structure is installed on the second connecting pipe 9. The second reaction tank 8 has a second outlet 11 and a second sewage outlet 12. The second outlet 11 is connected to a purifier 13, and the purifier 13 is connected to an outlet pipe 14.

[0029] The drained water enters the coarse filter 1 through the first inlet pipe 2. The coarse filter 1 is used to filter out larger impurities in the drained water. The drained water filtered by the coarse filter 1 enters the first reaction tank 5 through the first transfer pump 4. A chemical dosing structure is used to add chemicals to precipitate suspended solids in the drained water. Chemicals for precipitating calcium and magnesium ions can also be added. The drained water after the first treatment is sent to the second reaction tank 8 through the second transfer pump 10. Chemicals are added through the second dosing structure and enter the second reaction tank 8 with the water flow to further purify the drained water, such as removing iron, manganese, and phosphorus. The drained water after the second treatment flows out through the second outlet hole 11 and enters the purifier 13. The purifier 13 is a conventional purifier that further improves the water quality. The purified water is discharged through the outlet pipe 14 and can be used for irrigation of farmland.

[0030] The scheme is further optimized. The first dosing structure includes a first liquid tank 15, a first sealing cover is detachably connected to the first liquid tank 15, the first liquid tank 15 is connected to a delivery pipe 16, a water pump 17 is installed on the delivery pipe 16, a number of branch pipes 18 are connected to the end of the delivery pipe 16 away from the first liquid tank 15, a number of spray pipes 19 are connected to the branch pipes 18, the delivery pipe 16 extends into the first reaction tank 5, a mounting frame 20 is fixedly connected to the first reaction tank 5, the first liquid tank 15 and the water pump 17 are fixedly connected to the mounting frame 20, and the first liquid tank 15 is connected to a water source.

[0031] When adding the drug for the first time, open the first sealing cap, pour the drug into the first drug tank 15, close the first sealing cap, and then introduce water into the first drug tank 15 to dissolve the drug. The dissolved drug is then sent to the branch pipe 18 by the water pump 17 and finally sprayed out through the spray pipe 19, which extends into the drain water in the first reaction tank 5.

[0032] The scheme is further optimized as follows: a mesh plate 21 is fixedly connected inside the first reaction tank 5, and several sleeves 22 are rotatably connected to the mesh plate 21; a worm gear 23 is rotatably connected inside the first reaction tank 5 and extends out of the first reaction tank 5; an installation plate 24 is fixedly connected to the outside of the first reaction tank 5, and a first motor 25 is fixedly connected to the installation plate 24; the first motor 25 is connected to the worm gear 23 in a transmission connection; a turbine 26 is fixedly connected to the sleeve 22, and the worm gear 23 meshes with the turbine 26; a branch pipe 18 extends into the sleeve 22; and several blades 27 are fixedly connected to the outer edge of the sleeve 22, with the blades 27 corresponding to the spray pipe 19.

[0033] The sleeve 22 is rotatably connected to the mesh plate 21. When adding medicine to the first reaction tank 5, the first motor 25 drives the worm 23 to rotate, the worm 23 drives the turbine 26 to rotate, the turbine 26 drives the sleeve 22 to rotate on the mesh plate 21, and the sleeve 22 drives the blade 27 to rotate. The blade 27 is close to the height of the spray pipe 19. When the spray pipe 19 sprays out medicine, it spreads rapidly to the surroundings under the action of the rotation of the blade 27, so that the medicine is more evenly distributed in the drain water.

[0034] In a further optimized design, a first gear 28 is fixedly connected to the output end of the first motor 25, and a second gear 29 is fixedly connected to the worm gear 23. The first gear 28 and the second gear 29 mesh with each other, and the sleeve 22 and the mesh plate 21 are rotatably connected by a bearing 30.

[0035] The first motor 25 drives the first gear 28 to rotate, the first gear 28 drives the second gear 29 to rotate, and the second gear 29 drives the worm gear 23 to rotate.

[0036] In a further optimized design, several guide plates 31 are elastically connected inside the first reaction tank 5. The guide plates 31 are located on both sides of the first drain hole 7 and are inclined. Several second motors 32 are installed outside the first reaction tank 5. The second motors 32 are fixedly connected to the base, and the base is fixedly connected to the ground. The output end of the second motors 32 is fixedly connected to a rotating shaft 33, which extends into the first reaction tank 5. The rotating shaft 33 and the guide plates 31 are connected by a transmission mechanism.

[0037] After the drug is added to the first reaction tank 5, the drain water will undergo a flocculation reaction, and some substances will precipitate. The guide plate 31 will guide these substances to the first drain hole 7 to facilitate the discharge of the precipitated substances. After a long reaction, there may be precipitates attached to the guide plate 31. The second motor 32 drives the rotating shaft 33 to rotate. The rotating shaft 33 drives the guide plate 31 to move through the transmission mechanism, so that the precipitates on the guide plate 31 slide off.

[0038] The scheme is further optimized. The transmission mechanism includes a first disc 34 and a second disc 35. The first disc 34 is fixedly connected to the rotating shaft 33. A plurality of first protrusions 36 are fixedly connected to the first disc 34. The plurality of first protrusions 36 are circumferentially arranged on the first disc 34. The first protrusions 36 have a first inclined surface and a first vertical surface. The second disc 35 is fixedly connected to the guide plate 31 through a connecting block 37. A plurality of second protrusions 40 are fixedly connected to the second disc 35. The plurality of second protrusions 40 are circumferentially arranged on the second disc 35. The second protrusions 40 have a second inclined surface and a second vertical surface. The first inclined surface abuts against the second inclined surface.

[0039] The inclined surfaces of the first protrusion 36 and the second protrusion 40 are attached together. When the rotating shaft 33 drives the first disk 34 to rotate, the first protrusion 36 and the second protrusion 40 will move relative to each other. Since the guide plate 31 is elastically connected in the first reaction tank 5, the second disk 35 will be lifted. As the first disk 34 rotates, the first protrusion 36 and the second protrusion 40 that were originally in contact will separate. After separation, the second disk 35 will suddenly fall under the drive of the guide plate 31, thereby causing the guide plate 31 to vibrate and causing the sediment attached to the guide plate 31 to slide off.

[0040] In a further optimized design, the guide plate 31 and the first reaction pool 5 are elastically connected by several first springs 41. Several top plates 42 are fixedly connected inside the first reaction pool 5, and second springs 43 are fixedly connected on the top plates 42. The end of the second spring 43 away from the top plate 42 is fixedly connected to the second disc 35.

[0041] The first spring 41 is used to connect the guide plate 31 and the first reaction tank 5. The top plate 42 is used to install the second spring 43. When the second disc 35 rises, the second spring 43 will be compressed. When the second disc 35 suddenly falls, the second spring 43 will cause the second disc to fall faster, increasing the vibration effect of the guide plate 31.

[0042] The scheme is further optimized. The second dosing structure includes a second medicine tank 44, a second sealing cover is detachably connected to the second medicine tank 44, the second medicine tank 44 is connected to the second connecting pipe 9 through a third connecting pipe, a one-way valve 45 is installed on the third connecting pipe, and the second medicine tank 44 is connected to a water source.

[0043] When adding medicine to the second medicine tank 44, open the second sealing cover, add the medicine to the second medicine tank 44, then close the second sealing cover and introduce water into the second medicine tank 44 to dissolve the medicine. The one-way valve 45 can prevent water in the third connecting pipe from flowing into the second medicine tank 44. The solution containing the medicine will enter the second connecting pipe 9 and then enter the second reaction tank 8.

[0044] The scheme is further optimized. A filter layer 46, a first baffle plate 47, and a second baffle plate 48 are fixedly connected inside the second reaction tank 8. The filter layer 46, the first baffle plate 47, and the second baffle plate 48 are arranged vertically. The first baffle plate 47 has several first through holes 49, which are inverted cone-shaped. Several connecting rods 50 are fixedly connected inside the first through holes 49, and conical caps 51 are fixedly connected to the connecting rods 50. The second baffle plate 48 has several second through holes 52, which are tortuous. Several traction ropes 53 are fixedly connected inside the second through holes 52, and floats 54 are fixedly connected to the traction ropes 53. The second water outlet 11 is located above the filter layer 46, and the connection position of the second connecting pipe 9 and the second reaction tank 8 is located below the second baffle plate 48.

[0045] The drained water and the chemicals continue to react in the second reaction tank 8 to remove substances such as iron, manganese, and phosphorus. The second connecting pipe 9 sends the drained water into the second reaction tank 8. To prevent sediment from flowing out of the second outlet hole 11, the second baffle plate 48 blocks it. The tortuous second through hole 52 contains a traction rope 53 and a float 54 to block the sediment. The first through hole 49 on the first baffle plate 47 is equipped with a conical cover 51 to further block the sediment. The filter layer 46 further blocks the sediment, thereby increasing the amount of water discharged from the second outlet hole 11.

[0046] The scheme is further optimized so that the second water outlet 11 and the purifier 13 are connected by the fourth connecting pipe 38, the fourth connecting pipe 38 is equipped with the third delivery pump 39, and the first sewage outlet 7 is connected to the filter press 55.

[0047] The third pump 39 delivers the drained water to the purifier 13, where the filter press 55 filters the sediment for easier subsequent processing.

[0048] The working principle of this device is as follows: Drained water enters the coarse filter 1 through the first inlet pipe 2. After being filtered by the coarse filter 1, the drained water enters the first reaction tank 5 through the first delivery pump 4. The first sealing cover is opened, and the medicine is poured into the first medicine tank 15. After the first sealing cover is closed, water is introduced into the first medicine tank 15 to dissolve the medicine. The dissolved medicine is sent to the branch pipe 18 by the water pump 17 and sprayed out through the spray pipe 19. When the medicine is sprayed out of the spray pipe 19, the first motor 25 drives the worm gear 23 to rotate. The worm gear 23 drives the turbine 26 to rotate. The turbine 26 drives the sleeve 22 to rotate on the mesh plate 21. The sleeve 22 drives the blade 27 to rotate. Under the rotation of blade 27, the drug rapidly diffuses to all sides, making the drug more evenly distributed in the drain water. After the drug is added to the first reaction tank 5, the drain water will undergo a flocculation reaction, resulting in sedimentation. The guide plate 31 will guide these substances to the first drain hole 7 to facilitate the discharge of sediment. After a long reaction, sediment may adhere to the guide plate 31. The second motor 32 is started, which drives the rotating shaft 33 to rotate. The rotating shaft 33 drives the first disc 34 to rotate, and the first protrusion 36 and the second protrusion 40 will move relative to each other. Since the guide plate 31 is elastically connected in the first reaction tank 5, the second disc 35 will be lifted. As the disc 34 rotates, the first protrusion 36 and the second protrusion 40, which were originally in contact, will separate. After separation, the second disc 35 will suddenly fall under the influence of the guide plate 31. The second spring 43 will accelerate the fall of the second disc, causing the guide plate 31 to vibrate and causing the sediment attached to the guide plate 31 to slide off. When adding medicine to the second medicine tank 44, the second sealing cover is opened, the medicine is added to the second medicine tank 44, and then the second sealing cover is closed, allowing water to flow into the second medicine tank 44 to dissolve the medicine. The one-way valve 45 prevents water in the third connecting pipe from flowing into the second medicine tank 44, allowing the solution containing the medicine to enter the second connecting pipe 9. The water then enters the second reaction tank 8, where the drained water and chemicals continue to react, removing substances such as iron, manganese, and phosphorus. To prevent sediment from flowing out of the second outlet 11, a second baffle plate 48 is used to block it. The tortuous second through hole 52 contains a traction rope 53 and a float 54 to block the sediment. A conical cover 51 is installed in the first through hole 49 on the first baffle plate 47 to further block the sediment. The filter layer 46 further blocks the sediment, thereby improving the water discharged from the second outlet 11. The purifier 13 further improves the water quality. The purified water is discharged through the outlet pipe 14 and can be used for irrigation of farmland.

[0049] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0050] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A farmland irrigation device for purifying and draining water, characterized in that, include: A primary treatment component includes a coarse filter (1), a first inlet pipe (2) connected to the coarse filter (1), a first reaction mechanism connected to the coarse filter (1), the coarse filter (1) and the first reaction mechanism being connected through a first connecting pipe (3), a first delivery pump (4) installed on the first connecting pipe (3), the first reaction mechanism including a first reaction tank (5), a first dosing structure provided on the first reaction tank (5), a first outlet hole (6) and several first sewage discharge holes (7) provided on the first reaction tank (5); The secondary treatment component includes a second reaction tank (8), which is connected to the first outlet (6) via a second connecting pipe (9). A second delivery pump (10) is installed on the second connecting pipe (9), and a second dosing structure is installed on the second connecting pipe (9). The second reaction tank (8) has a second outlet (11) and a second drain hole (12). The second outlet (11) is connected to a purifier (13), and the purifier (13) is connected to an outlet pipe (14). The first reaction tank (5) is elastically connected with several guide plates (31). The guide plates (31) are located on both sides of the first drain hole (7). The guide plates (31) are inclined. The first reaction tank (5) is provided with several second motors (32). The second motors (32) are fixedly connected to the base. The base is fixedly connected to the ground. The output end of the second motors (32) is fixedly connected to a rotating shaft (33). The rotating shaft (33) extends into the first reaction tank (5). The rotating shaft (33) and the guide plates (31) are connected by a transmission mechanism. The transmission mechanism includes a first disc (34) and a second disc (35). The first disc (34) is fixedly connected to the rotating shaft (33). A plurality of first protrusions (36) are fixedly connected to the first disc (34). The plurality of first protrusions (36) are circumferentially arranged on the first disc (34). The first protrusions (36) have a first inclined surface and a first vertical surface. The second disc (35) is fixedly connected to the guide plate (31) through a connecting block (37). A plurality of second protrusions (40) are fixedly connected to the second disc (35). The plurality of second protrusions (40) are circumferentially arranged on the second disc (35). The second protrusions (40) have a second inclined surface and a second vertical surface. The first inclined surface abuts against the second inclined surface. The guide plate (31) and the first reaction tank (5) are elastically connected by a number of first springs (41). A number of top plates (42) are fixedly connected inside the first reaction tank (5). A second spring (43) is fixedly connected on the top plate (42). The end of the second spring (43) away from the top plate (42) is fixedly connected to the second disc (35).

2. The farmland irrigation device for purifying and draining water according to claim 1, characterized in that: The first dosing structure includes a first liquid tank (15), a first sealing cover is detachably connected to the first liquid tank (15), the first liquid tank (15) is connected to a delivery pipe (16), a water pump (17) is installed on the delivery pipe (16), a number of branch pipes (18) are connected to the end of the delivery pipe (16) away from the first liquid tank (15), a number of spray pipes (19) are connected to the branch pipes (18), the delivery pipe (16) extends into the first reaction tank (5), a mounting frame (20) is fixedly connected to the first reaction tank (5), the first liquid tank (15) and the water pump (17) are fixedly connected to the mounting frame (20), and the first liquid tank (15) is connected to a water source.

3. The farmland irrigation device for purifying and draining water according to claim 2, characterized in that: A mesh plate (21) is fixedly connected inside the first reaction tank (5). Several sleeves (22) are rotatably connected to the mesh plate (21). A worm (23) is rotatably connected inside the first reaction tank (5). The worm (23) extends out of the first reaction tank (5). An installation plate (24) is fixedly connected to the outside of the first reaction tank (5). A first motor (25) is fixedly connected to the installation plate (24). The first motor (25) is connected to the worm (23) in a transmission connection. A worm wheel (26) is fixedly connected to the sleeve (22). The worm (23) meshes with the worm wheel (26). The branch pipe (18) extends into the sleeve (22). Several blades (27) are fixedly connected to the outer edge of the sleeve (22). The blades (27) are correspondingly arranged with the spray pipe (19).

4. The farmland irrigation device for purifying and draining water according to claim 3, characterized in that: The output end of the first motor (25) is fixedly connected to a first gear (28), and the worm (23) is fixedly connected to a second gear (29). The first gear (28) meshes with the second gear (29), and the sleeve (22) and the mesh plate (21) are rotatably connected by a bearing (30).

5. The farmland irrigation device for purifying and draining water according to claim 1, characterized in that: The second dosing structure includes a second liquid tank (44), a second sealing cover is detachably connected to the second liquid tank (44), the second liquid tank (44) is connected to the second connecting pipe (9) through a third connecting pipe, a one-way valve (45) is installed on the third connecting pipe, and the second liquid tank (44) is connected to a water source.

6. The farmland irrigation device for purifying and draining water according to claim 1, characterized in that: The second reaction tank (8) is fixedly connected to a filter layer (46), a first baffle plate (47) and a second baffle plate (48). The filter layer (46), the first baffle plate (47) and the second baffle plate (48) are arranged vertically. The first baffle plate (47) has several first through holes (49). The first through holes (49) are inverted cone shape. Several connecting rods (50) are fixedly connected in the first through holes (49). A conical cover (51) is fixedly connected to the connecting rods (50). The second baffle plate (48) has several second through holes (52). The second through holes (52) are tortuous. Several traction ropes (53) are fixedly connected in the second through holes (52). A float (54) is fixedly connected to the traction ropes (53). The second water outlet (11) is located above the filter layer (46). The connection position of the second connecting pipe (9) and the second reaction tank (8) is located below the second baffle plate (48).

7. The farmland irrigation device for purifying and draining water according to claim 1, characterized in that: The second water outlet (11) and the purifier (13) are connected by a fourth connecting pipe (38), on which a third delivery pump (39) is installed, and the first sewage outlet (7) is connected to a filter press (55).

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