Water circulation system for agricultural irrigation

Abstract

The invention discloses an agricultural irrigation water circulation system, and relates to the technical field of water treatment.The agricultural irrigation water circulation system comprises a water pumping device, a first-layer filtering device, a dirt scraping device, a purifying device and a water collecting tank, the water pumping device pumps sewage into the first-layer filtering device, and the first-layer filtering device is composed of four sets of filtering plates and a water passing pipe; the four groups of filter plates are respectively mounted in four different directions of the water pipe, a partition plate is mounted between every two groups of filter plates, impurities in sewage are filtered out by the filter plates, the dirt scraping device scrapes the impurities on the filter plates, the water pipe is connected with the upper and lower filter plates to flush out the impurities in the filter holes, and the sewage enters the purification device from the lower filter plate. The purification device is composed of two layers of ultraviolet lamp panels, sewage is purified through ultraviolet rays, the purified water flows into the water collecting tank, the work of replacing a filter plate is omitted, harmful substances in water are purified through the ultraviolet rays, and the harmful substances in water are prevented from harming crops when farmland is recharged.

Description

Technical Field

[0001] The invention relates to the technical field of water treatment, in particular to an agricultural irrigation water circulation system. Background Art

[0002] With the population growth and rapid socio-economic development in my country, water resources are particularly scarce. my country is a large agricultural country with a large water consumption. Especially farmland, as a major water user, accounts for about 63% of the total water consumption in China. However, the irrigation water utilization coefficient in my country in 2022 and 2023 is only 0.572 and 0.576, while the agricultural irrigation water utilization coefficient in other large agricultural countries reaches 0.7-0.8. At present, the agricultural water use efficiency is low and there is huge water-saving potential. Therefore, improving the agricultural irrigation water utilization coefficient is of great significance to the development of my country's agriculture and the improvement of the current increasingly tense water supply and demand problems. However, the traditional agricultural irrigation water circulation system requires frequent replacement of filters, and the water purification effect is not obvious. It is urgent to improve the working efficiency and effect of the agricultural irrigation water circulation system. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide an agricultural irrigation water circulation system to improve the working efficiency and effect of agricultural irrigation water circulation.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solution: an agricultural irrigation water circulation system, comprising:

[0005] A pumping device, the pumping device comprising a pump, a sewage pipe and a first water outlet, the pump pumping sewage out of the sewage pipe;

[0006] The first filtering device comprises a water inlet box, four groups of filter plates, a driving device, a first rotating shaft, a connecting plate, two groups of fixing blocks and a water pipe, the first water outlet is connected to the water inlet box, the four groups of filter plates are respectively installed in four different directions of the water pipe, the water pipe is placed vertically, the two sides of the water pipe are two groups of fixing blocks, the surfaces of the four groups of filter plates are respectively provided with filter holes at equal intervals, the shape of the four groups of filter plates are all concave arc plates, a partition is installed between each group of filter plates, the four groups of filter plates are respectively an upper filter plate, a lower filter plate, a first side filter plate and a second side filter plate, the output end of the water inlet box is connected to the upper filter plate, Two groups of side plates are respectively installed on the side of the partition, and the two groups of side plates are respectively connected to the two ends of each group of the partition and the filter plate, the connecting plate is installed on the surface of the side plate, and the driving device is installed on the surface of the connecting plate, and the driving device includes a first driver and a first rotating shaft, the first rotating shaft is connected to the connecting plate, and the first driver drives the first rotating shaft to rotate, thereby driving the partition and the filter plate to rotate clockwise, when the partition and the filter plate rotate, the two groups of fixed blocks and the water pipe are fixed, and the water filtered by the upper filter plate is used to flush the filter holes in the lower filter plate through the water pipe, so that the impurities in the filter holes of the lower filter plate can be flushed clean;

[0007] A purification device, the purification device is located at the lower side of the first filtering device, the purification device is composed of an ultraviolet lamp panel, and the ultraviolet rays emitted by the ultraviolet lamp panel continuously and evenly irradiate and purify the water flow;

[0008] A water collecting tank is located at the lower side of the purification device and is used to store purified water.

[0009] Preferably, the purification device comprises two layers of ultraviolet lamp panels, the two layers of ultraviolet lamp panels form a vertically distributed S-shaped channel, a guide plate and a fourth water outlet are installed at the lower part of the lower filter plate, the guide plate directs the filtered water flow from the fourth water outlet to the bottom of the S-shaped channel formed by the two layers of ultraviolet lamp panels, and due to the effect of gravity, the sewage passes through the S-shaped channel formed by the two layers of ultraviolet lamp panels and flows out from the top of the S-shaped channel, and a number of evenly distributed spoiler tubes are installed in the S-shaped channel, the spoiler tubes contain arc-shaped partitions distributed horizontally at equal intervals, and the arc-shaped channel formed between the arc-shaped partitions is used to disrupt the passing water flow.

[0010] Preferably, a waste storage box is respectively installed on one side of the first side filter plate and the second side filter plate, a waste channel is arranged at the bottom of the waste storage box, and a scraping device is respectively arranged inside the two groups of waste storage boxes, and the scraping device comprises a second driver, a sleeve, a telescopic rod, a spring and a scraper, the telescopic rod slides in the sleeve, a scraper is installed at one end of the telescopic rod, rubber particles are attached to the surface of the scraper, a spring is arranged between the scraper and the sleeve, the spring is sleeved in the telescopic rod, the output end of the second driver is connected to the sleeve, the spring controls the two groups of scrapers to be respectively close to the surface of the first side filter plate and the second side filter plate, the second driver drives the sleeve and the scraper to rotate back and forth, and when the filter plate rotates When the filter plate stops rotating, the scraper device will scrape the filter plate again. After the water filtered by the upper filter plate is flushed through the filter holes in the lower filter plate through the water pipe, there will still be residues adhering to the surface of the filter plate. One group of scrapers is used to clean the waste residue of the first side filter plate into the waste residue storage box, and the other group of scrapers is used to clean the residue on the surface of the second side filter plate after flushing into the waste residue storage box. The scraper device can scrape off the sludge adhering to the surface of the filter plate, and combined with the flushing effect of the water pipe on the filter holes in the lower filter plate, all-round cleaning of the filter plate is achieved, repeated replacement and cleaning of the filter plate is avoided, and the working efficiency of sewage filtration is increased.

[0011] Preferably, a limiting plate is provided at one end of the second driver, the limiting plate is used to limit the position of the scraping device, and one end of the partition plate can slide on the surface of the limiting plate.

[0012] Preferably, a second filter device is installed between the first filter device and the purification device, and a baffle is installed on one side of the output end of the lower filter plate, and the baffle is used to drain water seeping from the lower filter plate into the second filter device. The second filter device comprises a ceramic filter layer, a quartz sand filter layer and an activated carbon filter layer, and the ceramic filter layer, the quartz sand filter layer and the activated carbon filter layer are distributed layer by layer from top to bottom, the ceramic filter layer is used to remove microorganisms, suspended particles and organic matter in the water, the quartz sand filter layer is used to filter suspended matter in sewage, and the activated carbon filter layer is used to further adsorb organic matter, heavy metal ions and foreign colors and odors in the water. The first filter device mainly removes larger granular waste residues in the sewage, and the second filter device is mainly used to remove foreign matter, foreign colors and odors in the water and provide pretreatment measures for the ultraviolet purification device. If the filtering effect of the filter device is not good, it will directly affect the light transmittance of the sewage, and the purification effect of ultraviolet rays will be greatly reduced.

[0013] Preferably, reflective plates are respectively arranged at the bottom and top of the S-shaped channel formed by the second layer of ultraviolet lamp panels, and the reflective plates are used to reflect the ultraviolet rays emitted by the ultraviolet lamp panels, and the reflected ultraviolet rays are used to purify the water flow. During this process, the ultraviolet lamp panels continuously irradiate the sewage and purify the microorganisms, bacteria and viruses in the water. This method can effectively prevent harmful substances in the water from causing harm to crops when recharging farmland.

[0014] Preferably, an aerator is provided at the bottom of the water collecting tank, and the aerator is used to increase the oxygen content of the water in the water collecting tank. The increase in the oxygen content in the sewage improves the oxygen transfer effect in the water and the metabolic capacity of the microorganisms, thereby ensuring that the microorganisms in the pool can oxidize and decompose organic matter in the sewage under the condition of sufficient dissolved oxygen.

[0015] Preferably, a nutrient solution pipe is installed inside the water collecting tank, and the nutrient solution flows into the water collecting tank through the nutrient solution pipe, thereby increasing the nutrients required by the crops in the water body.

[0016] Preferably, a stirring device is arranged inside the water collecting tank, and the stirring device includes a stirring motor, a second rotating shaft and stirring blades. The stirring motor is placed on the top of the water collecting tank, and the second rotating shaft is connected to the stirring blades. The stirring motor drives the stirring blades to rotate via the second rotating shaft. The stirring device is used to stir the water in the water collecting tank. The stirring device can not only increase the oxygen content in the water, but also can fully and evenly stir the nutrient solution injected from the business liquid pipe with the water.

[0017] Preferably, a second water outlet is provided at the output end of the S-shaped channel, and the purified sewage is stored in a water collecting tank through the second water outlet. A third water outlet is provided at the bottom of the water collecting tank, and the third water outlet is used to discharge the water in the water collecting tank.

[0018] Beneficial effects: The present invention provides an agricultural irrigation water circulation system, wherein the first filtering device adopts four groups of rotatable filter plates, and utilizes the impact of the water body and the scraping device to remove the filter holes in the filter plates and the waste residue on the surface of the filter plates, thereby avoiding the influence of frequent replacement of the filter plates on reduced work efficiency, and provides a second filtering device to further filter the microorganisms, suspended particles and organic matter in the sewage, and purifies the microorganisms, bacteria and viruses in the water through the purification device, effectively preventing the harmful substances in the water from causing harm to crops when recharging the farmland, and arranging the aerator and the stirring device in the water collecting tank to increase the oxygen concentration in the water, thereby ensuring that the microorganisms in the pool can oxidize and decompose the organic matter in the sewage under the condition of sufficient dissolved oxygen, and a nutrient solution pipe is provided to inject the nutrient solution required by the crops into the water body, thereby ensuring the content of the nutrients required by the crops in the water body. The present invention greatly increases the efficiency and effect of the recycling of agricultural irrigation water. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0020] In the attached picture:

[0021] Figure 1 It is an overall schematic diagram of the agricultural irrigation water circulation system of the present invention;

[0022] Figure 2 is a schematic diagram of a first filtering device and a dirt scraping device of the present invention;

[0023] Figure 3 is a partial schematic diagram of the first filtering device of the present invention;

[0024] Figure 4 It is a schematic diagram of the interior of the water collecting tank of the present invention.

[0025] Figure 5 It is a partial schematic diagram of the spoiler tube of the present invention

[0026] Numbers in the figure: 1, water pump; 2, sewage pipe; 3, first water outlet; 4, water inlet tank; 5, limit plate; 6, scraper; 7, waste residue storage box; 8, waste residue channel; 9, baffle; 10, first filter device; 11, ceramic filter layer; 12, quartz sand filter layer; 13, activated carbon filter layer; 14, ultraviolet light board; 15, reflector; 16, second water outlet; 17, water collection tank; 18, nutrient solution pipe; 19, third water outlet; 20, stirring motor; 21, second rotating shaft; 22. stirring blade; 23. aerator; 24. water pipe; 25. partition; 26. upper filter plate; 27. first side filter plate; 28. lower filter plate; 29. ​​second side filter plate; 30. second driver; 31. sleeve; 32. telescopic rod; 33. spring; 34. filter hole; 35. fixing block; 36. first driver; 37. side plate; 38. first rotating shaft; 39. connecting plate; 40. scraper; 41. guide plate; 42. fourth water outlet; 43. arc partition; 44. spoiler tube. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. The following text is only used to describe an implementation method of an agricultural irrigation water circulation system of the present invention, and does not strictly limit the scope of protection specifically requested by the present invention.

[0028] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features.

[0029] Example: Figure 1-Figure 5 As shown, an agricultural irrigation water circulation system comprises:

[0030] Pumping devices, such as Figure 1 As shown, the pumping device includes a pump 1, a sewage pipe 2 and a first water outlet 3, and the pump 1 pumps sewage out of the sewage pipe 2;

[0031] The first filtering device 10, such as Figure 2 and Figure 3 As shown, the first filtering device 10 includes a water inlet box 4, four groups of filter plates, a driving device, a first rotating shaft 38, a connecting plate 39, two groups of fixing blocks 35 and a water pipe 24, the first water outlet 3 is connected to the water inlet box 4, the four groups of filter plates are respectively installed in four different directions of the water pipe 24, the water pipe 24 is placed vertically, and the two sides of the water pipe 24 are two groups of fixing blocks 35, the surfaces of the four groups of filter plates are respectively provided with filter holes 34 with equal spacing, the shape of the four groups of filter plates are all concave arc plates, and a partition plate 25 is installed between each group of filter plates, and the four groups of filter plates are respectively an upper filter plate 26, a lower filter plate 28, a first side filter plate 27 and a second side filter plate 29, the output end of the water inlet box 4 is connected to the upper filter plate 26, and the side of the partition plate 25 is connected to the upper filter plate 26. Two groups of side plates 37 are respectively installed on the surface, and the two groups of side plates 37 are respectively connected to the two ends of each group of the partition plates 25 and the filter plates. The connecting plates 39 are installed on the surface of the side plates 37, and the driving device is installed on the surface of the connecting plates 39. The driving device includes a first driver 36 and a first rotating shaft 38. The first rotating shaft 38 is connected to the connecting plate 39. The first driver 36 drives the first rotating shaft 38 to rotate, thereby driving the partition plates 25 and the filter plates to rotate clockwise. When the partition plates 25 and the filter plates rotate, the two groups of fixed blocks 35 and the water pipe 24 are fixed to the water pipe 24. The water filtered by the upper filter plate 26 is flushed to the filter holes 34 in the lower filter plate 28 through the water pipe 24, so that the impurities in the filter holes 34 of the lower filter plate 28 can be flushed clean;

[0032] A purification device, the purification device is located at the lower side of the first filtering device 10, the purification device is composed of an ultraviolet lamp panel 14, and the ultraviolet rays emitted by the ultraviolet lamp panel 14 continuously and evenly irradiate and purify the water flow;

[0033] Water collecting tank 17, such as Figure 4As shown, the water collecting tank 17 is located at the lower side of the purification device, and the water collecting tank 17 is used to store purified water.

[0034] In an embodiment, Figure 1 and Figure 5 As shown, the purification device includes two layers of ultraviolet lamp panels 14, and the two layers of ultraviolet lamp panels 14 form a vertically distributed S-shaped channel. The guide plate 41 and the fourth water outlet 42 are installed at the lower part of the lower filter plate 28. The guide plate 41 guides the filtered water flow from the fourth water outlet 42 to the bottom of the S-shaped channel formed by the two layers of ultraviolet lamp panels 14. Because of the effect of gravity, the sewage flows out from the top of the S-shaped channel through the S-shaped channel formed by the two layers of ultraviolet lamp panels. A number of evenly distributed spoiler tubes 44 are installed in the S-shaped channel. The spoiler tubes 44 contain arc partitions 43 with equal intervals and horizontal distribution. The arc partitions 43 form an arc channel. The ultraviolet lamp panel 14 has different purification effects on water flows at different distances. The arc channel is used to disturb the flowing water, and the disturbed water flow can be evenly irradiated and purified by the ultraviolet rays emitted by the ultraviolet lamp panel 14, thereby improving the purification effect of the ultraviolet lamp panel 14 on sewage.

[0035] In an embodiment, Figure 2As shown, a waste storage box 7 is respectively installed on one side of the first side filter plate 27 and the second side filter plate 29, a waste storage box 7 is provided with a waste channel 8 at the bottom of the waste storage box 7, and a scraping device 6 is respectively arranged inside the two groups of the waste storage boxes 7, and the scraping device 6 includes a second driver 30, a sleeve 31, a telescopic rod 32, a spring 33 and a scraper 40, the telescopic rod 32 slides in the sleeve 31, and a scraper 40 is installed at one end of the telescopic rod 32, and rubber particles are attached to the surface of the scraper 40 to increase the friction force on the surface of the scraper 40, a spring 33 is arranged between the scraper 40 and the sleeve 31, and the spring 33 is sleeved in the telescopic rod 32, and the output end of the second driver 30 is connected to the sleeve 31, and the spring 33 controls the two groups of scrapers 40 to be respectively close to the surface of the first side filter plate 27 and the second side filter plate 29, and the second driver 30 drives the scrapers 40 to be moved to the first side filter plate 27 and the second side filter plate 29. The sleeve 31 and the scraper 40 rotate back and forth. When the filter plate rotates, the scraper device 6 rotates to a side that does not affect the rotation of the filter plate. When the filter plate stops rotating, the scraper device 6 scrapes the filter plate again. After the water filtered by the upper filter plate 26 is flushed through the filter holes 34 in the lower filter plate 28 by the water pipe 24, there will still be residues adhering to the surface of the filter plate. One group of the scrapers 40 is used to clean the waste residue of the first side filter plate 27 into the waste residue storage box 7, and the other group of the scrapers 40 is used to clean the residue on the surface of the flushed second side filter plate 29 into the waste residue storage box 7. The scraper device 6 can scrape off the sludge adhering to the surface of the filter plate. Combined with the flushing effect of the water pipe 24 on the filter holes 34 in the lower filter plate 28, the filter plate is fully cleaned, the repeated replacement and cleaning of the filter plate is avoided, and the working efficiency of sewage filtration is improved.

[0036] In an embodiment, Figure 2 As shown, a limiting plate 5 is disposed at one end of the second driver 30 , and the limiting plate 5 is used to limit the position of the scraping device 6 , and one end of the partition plate 25 can slide on the surface of the limiting plate 5 .

[0037] In an embodiment, Figure 1 and Figure 2As shown, a second filter device is installed between the first filter device 10 and the purification device, and a baffle 9 is installed on one side of the output end of the lower filter plate 28. The baffle 9 is used to drain the water seeping from the lower filter plate 28 to the second filter device. The second filter device includes a ceramic filter layer 11, a quartz sand filter layer 12 and an activated carbon filter layer 13. The ceramic filter layer 11, the quartz sand filter layer 12 and the activated carbon filter layer 13 are distributed layer by layer from top to bottom. The ceramic filter layer 11 is used to remove microorganisms, suspended particles and organic matter in the water. The quartz sand filter layer 12 is used to filter suspended matter in sewage. The activated carbon filter layer 13 is used to further adsorb organic matter, heavy metal ions and foreign colors and odors in the water. The first filter device 10 mainly removes larger granular waste residues in sewage. The second filter device is mainly used to remove foreign matter, foreign colors and odors in water and provide pretreatment measures for the ultraviolet purification device. If the filtering effect of the filter device is not good, it will directly affect the light transmittance of the sewage, and the purification effect of ultraviolet rays will be greatly reduced.

[0038] In an embodiment, Figure 1 As shown, reflecting plates 15 are respectively arranged at the bottom and the top of the S-shaped channel formed by the second layer of ultraviolet lamp panels 14. The reflecting plates 15 are used to reflect the ultraviolet rays emitted by the ultraviolet lamp panels 14. The reflected ultraviolet rays are used to purify the water flow. During this process, the ultraviolet lamp panels 14 continuously irradiate the sewage and purify the microorganisms, bacteria and viruses in the water. This method can effectively prevent harmful substances in the water from causing harm to crops when recharging farmland.

[0039] In an embodiment, Figure 4 As shown, an aerator 23 is provided at the bottom of the water collecting tank 17, and the aerator 23 is used to increase the oxygen content of the water in the water collecting tank 17. The increase in the oxygen content in the sewage improves the oxygen transfer effect in the water and the metabolic capacity of the microorganisms, thereby ensuring that the microorganisms in the pool can oxidize and decompose organic matter in the sewage under the condition of sufficient dissolved oxygen.

[0040] In an embodiment, Figure 4 As shown, a nutrient solution pipe 18 is installed inside the water collecting tank 17, and the nutrient solution flows into the water collecting tank 17 through the nutrient solution pipe 18, thereby increasing the nutrients required by the crops in the water body.

[0041] In an embodiment, Figure 4As shown, a stirring device is arranged inside the water collecting tank 17, and the stirring device includes a stirring motor 20, a second rotating shaft 21 and a stirring blade 22. The stirring motor 20 is placed on the top of the water collecting tank 17, and the second rotating shaft 21 is connected to the stirring blade 22. The stirring motor 20 drives the stirring blade 22 to rotate via the second rotating shaft 21. The stirring device is used to stir the water in the water collecting tank 17. The stirring device can not only increase the oxygen content in the water, but also fully and evenly stir the nutrient solution injected from the business liquid pipe with the water.

[0042] In an embodiment, a second water outlet 16 is provided at the output end of the S-shaped channel, and the purified sewage is stored in a water collecting tank 17 through the second water outlet 16. A third water outlet 19 is provided at the bottom of the water collecting tank 17, and the third water outlet 19 is used to discharge the water in the water collecting tank 17.

[0043] When the present invention is in use, the water pump 1 draws sewage from the sewage pipe 2 and enters the water inlet box 4 through the first water outlet 3. The upper filter plate 26 performs the first step of filtering the residue in the sewage. The filtered water flows from the filter hole 34 of the lower filter plate 28 through the water pipe 24 to the second purification device. When the waste residue in the upper filter plate 26 accumulates to a certain extent, the first driver 36 drives the first filtering device 10 to rotate, and the scraping device 6 scrapes the waste residue in the first side filter plate 27 to the waste residue storage box 7. When the first side When the waste residue adhering to the surface of the filter plate 27 is scraped off, the first driver 36 drives the first filter device 10 to rotate, and the water flowing through the water pipe 24 flushes the filter holes 34 of the lower filter plate 28 to flush out the waste residue in the filter holes 34. When the filter holes 34 in the lower filter plate 28 are flushed clean, the first driver 36 drives the first filter device 10 to rotate, and the scraping device further scrapes the waste residue still adhering to the second side filter plate 29 flushed out from the surface of the second side filter plate 29. When the surface of the second side filter plate 29 is scraped clean, The first driver 36 drives the first filter device 10 to rotate, and the sewage flows from the cleaned upper filter plate 26 to the water pipe 24, thereby cleaning the filter plate and avoiding the influence of reduced work efficiency caused by frequent replacement of the filter plate. The water body passes through the ceramic filter layer 11, the quartz sand filter layer 12 and the activated carbon filter layer 13 of the second filter device to further filter the microorganisms, suspended particles and organic matter in the sewage. The filtered water flows to the purification device. The second layer of the ultraviolet lamp board 14 constitutes an S-shaped channel, and a turbulent flow is arranged inside the S-shaped channel. Pipe 44, the disruptor pipe 44 disturbs the flowing water and then flows through the S-shaped channel, the purified water flows into the water collecting tank 17, a nutrient solution pipe 18 is arranged in the water collecting tank 17, the nutrient solution required by the crops is injected into the water body, thereby ensuring the content of nutrients required by the crops in the water body, the aerator 23 and the stirring device are arranged in the water collecting tank 17 to increase the oxygen concentration in the water, thereby ensuring that the microorganisms in the pool can oxidize and decompose organic matter in the sewage under the condition of sufficient dissolved oxygen, and the present invention greatly increases the efficiency and effect of recycling water for agricultural irrigation.

[0044] Finally, it should be noted that the above is only a preferred example of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An agricultural irrigation water circulation system, characterized in that: include: A pumping device, the pumping device comprising a pump, a sewage pipe and a first water outlet, the pump pumping sewage out of the sewage pipe; The first filtering device comprises a water inlet box, four groups of filter plates, a driving device, a first rotating shaft, a connecting plate, two groups of fixing blocks and a water pipe. The first water outlet is connected to the water inlet box. The four groups of filter plates are respectively installed in four different directions of the water pipe. The water pipe is placed vertically. There are two groups of fixing blocks on both sides of the water pipe. The surfaces of the four groups of filter plates are respectively provided with filter holes at equal intervals. The shape of the four groups of filter plates is a concave arc plate. A partition is installed between each group of filter plates. The four groups of filter plates are respectively an upper filter plate, a lower filter plate, a first side filter plate and a second side filter plate. The output end of the water inlet box The partition plate is connected to the upper filter plate, and two groups of side plates are respectively installed on the side of the partition plate, and the two groups of side plates are respectively connected to the two ends of each group of the partition plate and the filter plate, and the connecting plate is installed on the surface of the side plate, and the driving device is installed on the surface of the connecting plate, and the driving device includes a first driver and a first rotating shaft, and the first rotating shaft is connected to the connecting plate, and the first driver drives the first rotating shaft to rotate, thereby driving the partition plate and the filter plate to rotate clockwise, and when the partition plate and the filter plate rotate, the two groups of fixed blocks and the water pipe are fixed, and the water filtered by the upper filter plate is washed to the filter holes in the lower filter plate through the water pipe; A purification device, the purification device is located at the lower side of the first filtering device, the purification device is composed of an ultraviolet lamp panel, and the ultraviolet rays emitted by the ultraviolet lamp panel continuously and evenly irradiate and purify the water flow; A water collecting tank is located at the lower side of the purification device and is used to store purified water.

2. The agricultural irrigation water circulation system according to claim 1, characterized in that: The purification device comprises two layers of ultraviolet lamp panels, which form a vertically distributed S-shaped channel. A guide plate and a fourth water outlet are installed at the lower part of the lower filter plate. The guide plate directs the filtered water flow from the fourth water outlet to the bottom of the S-shaped channel formed by the two layers of ultraviolet lamp panels. Under the action of gravity, the sewage flows out from the top of the S-shaped channel through the S-shaped channel formed by the two layers of ultraviolet lamp panels. A plurality of evenly distributed spoiler tubes are installed in the S-shaped channel. The spoiler tubes contain arc partitions that are evenly spaced and horizontally distributed. The arc channel formed between the arc partitions is used to disturb the passing water flow.

3. The agricultural irrigation water circulation system according to claim 1, characterized in that: A waste storage box is respectively installed on one side of the first side filter plate and the second side filter plate, a waste storage box is provided at the bottom of the waste storage box, and a scraping device is respectively arranged inside the two groups of waste storage boxes, and the scraping device comprises a second driver, a sleeve, a telescopic rod, a spring and a scraper, the telescopic rod slides in the sleeve, a scraper is installed at one end of the telescopic rod, rubber particles are attached to the surface of the scraper, a spring is arranged between the scraper and the sleeve, the spring is sleeved in the telescopic rod, the output end of the second driver is connected with the sleeve, the spring controls the two groups of scrapers to be respectively close to the surface of the first side filter plate and the second side filter plate, and the second driver drives the sleeve and the scraper to rotate.

4. The agricultural irrigation water circulation system according to claim 3, characterized in that: A limiting plate is disposed at one end of the second driver, and the limiting plate is used to limit the position of the scraping device, and one end of the partition plate can slide on the surface of the limiting plate.

5. The agricultural irrigation water circulation system according to claim 1, characterized in that: A second filter device is installed between the first filter device and the purification device, and a baffle is installed on one side of the output end of the lower filter plate. The baffle is used to drain water seeping from the lower filter plate to the second filter device. The second filter device includes a ceramic filter layer, a quartz sand filter layer and an activated carbon filter layer. The ceramic filter layer, the quartz sand filter layer and the activated carbon filter layer are distributed layer by layer from top to bottom.

6. The agricultural irrigation water circulation system according to claim 1, characterized in that: Reflecting plates are respectively arranged at the bottom and the top of the S-shaped channel formed by the second layer of ultraviolet lamp panels, and the reflecting plates are used to reflect the ultraviolet rays emitted by the ultraviolet lamp panels.

7. The agricultural irrigation water circulation system according to claim 1, characterized in that: An aerator is arranged at the bottom of the water collecting tank.

8. The agricultural irrigation water circulation system according to claim 1, characterized in that: A nutrient solution pipe is installed inside the water collecting tank, and the nutrient solution flows into the water collecting tank through the nutrient solution pipe.

9. The agricultural irrigation water circulation system according to claim 1, characterized in that: A stirring device is arranged inside the water collecting tank, and the stirring device includes a stirring motor, a second rotating shaft and stirring blades. The stirring motor is placed on the top of the water collecting tank, and the second rotating shaft is connected to the stirring blades. The stirring motor drives the stirring blades to rotate via the second rotating shaft, and the stirring device is used to stir the water in the water collecting tank.

10. The agricultural irrigation water circulation system according to claim 1, characterized in that: A second water outlet is arranged at the output end of the S-shaped channel, and the purified sewage is stored in a water collecting tank through the second water outlet. A third water outlet is arranged at the bottom of the water collecting tank, and the third water outlet is used to discharge the water in the water collecting tank.

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