Rainwater recovery system and method for facility agriculture

Abstract

The invention relates to the technical field of rainwater recycling, in particular to a rainwater recycling system and method for facility agriculture. Comprising a planting area, guide rails arranged on the two sides of the planting area, a telescopic greenhouse frame body arranged along the guide rails in a sliding mode to form an arched greenhouse roof, a greenhouse covering film laid and fixed to the outer surface of the greenhouse frame body, a plurality of water collecting umbrellas erected on hollow stand columns, and a sediment box connected with the hollow stand columns through water conveying hoses. The filtering mechanism is connected with the sediment box through a pipeline, the water storage unit is connected with the filtering mechanism through a water pipe, and when the greenhouse covering film is unfolded and the umbrella is supported, the umbrella is in contact with the greenhouse covering film. According to the device, rainwater and snow water can be collected according to the change of seasons, crop soil can be effectively scoured through natural rainwater, redundant salt in the soil is taken away, and sudden soil salinization is prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of rainwater recycling, and in particular to a rainwater recycling system and method for facility agriculture. Background Art

[0002] In the process of social and economic development today, facility agriculture, as a key component of modern agriculture, plays an irreplaceable and important role. Facility agriculture uses closed structures such as greenhouses for planting, with an adaptive temperature control and ventilation system, effectively creating a relatively stable growth environment, greatly improving the efficiency and stability of agricultural production.

[0003] However, in this relatively closed planting environment, irrigation is mostly carried out in a limited space. Unlike traditional open-air agriculture, when it rains, rainwater can naturally irrigate the land. This process not only provides moisture to the soil, but more importantly, it can effectively remove the salt in the soil, thereby maintaining the salt balance of the soil and ensuring the health of the soil. However, in facility agriculture, due to the obstruction of structures such as greenhouses, the natural scouring effect of rainwater cannot be achieved. For a long time, the lack of rainwater scouring has caused salt to accumulate in the soil. After two or three years of continuous planting, the salt content in the soil gradually increased, and the soil began to become compacted, seriously affecting the growth and yield of crops.

[0004] When crops are planted in greenhouses of facility agriculture, all the water needed for crops comes from artificial irrigation. This method completely isolates the rainwater generated by nature outside the greenhouse, resulting in a huge waste of water resources. At present, rainwater collection mechanisms for collecting rainwater have achieved the collection and treatment of rainwater to a certain extent, but when rainwater collection mechanisms encounter snowy environments in winter, there is no effective way to collect snow water. Summary of the invention

[0005] In order to solve the above-mentioned problems, the present invention provides a rainwater recovery system and method for facility agriculture, which can collect rainwater and snow water according to seasonal changes, and can use natural rainwater to effectively flush crop soil, remove excess salt in the soil, and prevent sudden soil salinization.

[0006] In the first aspect, the present invention provides a rainwater recycling system for facility agriculture, which adopts the following technical solution: A rainwater recycling system for facility agriculture comprises a planting area, guide rails arranged on both sides of the planting area, a retractable greenhouse frame body slidingly arranged along the guide rails to form an arched greenhouse roof, a greenhouse film laid and fixed on the outer surface of the greenhouse frame body, a plurality of rain collecting umbrellas erected on hollow columns, a sedimentation box connected to the hollow columns through a water hose, a filtering mechanism connected to the sedimentation box through a pipeline, and a water storage unit connected to the filtering mechanism through a water pipe. When the greenhouse film is unfolded and the rain collecting umbrella is held up, the rain collecting umbrella is in contact with the greenhouse film.

[0007] Furthermore, the filtering mechanism includes a rainwater pollution interception basket and a composite flow filter connected in sequence, the water storage unit includes PP water storage modules stacked in an array, a composite geomembrane wrapping the PP water storage modules stacked in an array, a water delivery well arranged in the water storage unit for delivering water to the planting area, a lifting pump is provided outside the water delivery well, and the composite geomembrane includes a common waterproof layer and a root penetration resistant waterproof layer from the inside to the outside.

[0008] Furthermore, the rainwater sewage interception hanging basket includes a sewage interception finished product well, a hanging basket nested in the sewage interception finished product well, and the hanging basket includes a vertically arranged vertical filter screen, a semi-enclosed filter screen arranged along the inner wall of the sewage interception finished product well, and a sewage storage bin connected to the semi-enclosed filter screen.

[0009] Furthermore, the composite flow filter comprises a composite flow finished product well, a deflection baffle disposed on one side of the composite flow finished product well, and a filter basket disposed on the other side of the composite flow finished product well, wherein the deflection baffle comprises a plurality of transversely staggered metal baffles.

[0010] Furthermore, a photovoltaic panel and a battery are provided on the hollow column, the rain-collecting umbrella comprises an inverted umbrella cover, folding ribs accommodated in the umbrella cover, and a heating wire spirally arranged in the umbrella cover, the heating wire is connected to the battery, a rainwater collector is provided at the upper end of the hollow column, a support frame is arranged on the top of the rainwater collector, a motor connected to the battery is provided in the support frame, a driving screw is longitudinally arranged in the support frame along the axis of the hollow column, a driving plate is arranged on the driving screw, the driving plate is connected to the folding ribs by a pull rod, the umbrella cover is rectangular when it is propped up, the top of the rainwater collector is closed, the rainwater collector has openings around and at the bottom, and the bottom is connected to the hollow column, filters are provided at the openings around the rainwater collector, and the hollow column is connected to the sedimentation tank through a water hose.

[0011] Furthermore, the folding umbrella ribs are hinged on the rainwater collector, one end of the pull rod is hinged on the driving plate, the other end of the pull rod is hinged to the middle part of the folding umbrella ribs, a slider is provided on the folding umbrella ribs, a reinforcing rod is provided between the slider and the support frame, one end of the reinforcing rod is hinged on the slider, and the other end of the reinforcing rod is hinged on the support frame.

[0012] Furthermore, a pressure sensing switch including a pressure sensor is provided on the top of the rainwater collector, a temperature sensing switch including a temperature sensor is provided on the top of the support frame, the pressure sensing switch is connected to the motor, and the temperature sensing switch is connected to the heating wire.

[0013] Furthermore, the greenhouse frame body includes a fixed bracket and a plurality of movable brackets connected to the fixed bracket by a telescopic mechanism, the lower end of the movable bracket is provided with a roller sliding in a guide rail, the telescopic mechanism includes cross braces arranged between the movable brackets and between the movable brackets and the fixed brackets, and the fixed brackets and the movable brackets are both provided with limiting grooves for the sliding of the cross braces.

[0014] Furthermore, a primary treatment mechanism is provided in the sedimentation box, and the primary treatment mechanism includes a first partition and a second partition, and a gap is left between the first partition and the second partition and the top of the sedimentation box. The first partition and the second partition are longitudinally arranged in the middle of the sedimentation box. The first partition and the second partition divide the sedimentation box into a sedimentation area, a treatment area and a clean water area. A fine filter net is horizontally provided in the sedimentation area, and multiple groups of activated carbon adsorption nets are horizontally provided in the treatment area. A discard pipe is provided at the bottom of the sedimentation area.

[0015] Furthermore, an overflow port is provided on the hollow column, the water pipe extends into the water storage unit, and a cut-off mechanism is provided at the lower end of the water pipe extending into the water storage unit. The cut-off mechanism includes a water outlet cavity connected to the water outlet end of the water pipe, a lining net arranged at the bottom of the water outlet cavity, a float arranged on the lining net, a top plate connected by a pull rope, and a cut-off cover plate located on the upper side of the top plate and abutted by the top plate. A water outlet is provided on the outer wall of the water outlet cavity, and a torsion spring is provided at the rotating axis of the top plate. In the initial state, the pull rope pulls the top plate and the cut-off cover plate is opened, and the water outlet is connected to the water outlet cavity.

[0016] In a second aspect, a rainwater recycling method for facility agriculture comprises: Multiple rain collecting umbrellas collect rainwater. When rain falls, the pressure sensor in the umbrella detects the pressure signal of rainwater, and the driving plate moves down to open the folding umbrella ribs. When snow falls, the temperature sensor detects the low temperature signal, and the heating wire is started to heat the snow falling into the umbrella surface. At the same time, the pressure sensor detects the pressure signal, and the driving plate moves down to open the folding umbrella ribs. When the rain stops, the pressure sensor loses the pressure signal, and the driving plate moves up to fold the folding umbrella ribs. The sedimentation tank pre-treats the collected rainwater. The rainwater settles in the sedimentation area. The fine filter screen filters the rainwater flowing into the sedimentation area. The water level is higher than the first partition and flows into the treatment area. Multiple groups of activated carbon adsorption nets adsorb the rainwater flowing into the treatment area. The water level exceeds the second partition and flows into the clear water area and flows into the filtration mechanism through the pipeline. The initial rain flows into the sedimentation area and flows out of the sedimentation tank through the abandoned flow pipe. The filtering mechanism performs interception basket filtration and composite flow filtration on rainwater. After filtration, the rainwater flows into the water storage unit through the interception mechanism. In the water storage unit, when the water surface causes the float of the interception mechanism to float up, the float loses gravity, and the top plate presses against the interception cover plate to close the water inlet end of the water storage unit. When the lifting pump transfers water from the water storage unit to the outside, the float restores gravity after the water surface drops, and the float pulls the top plate to open the interception cover plate. The greenhouse frame is unfolded, and the cross braces are pulled to slide and be fixed in the limiting slide grooves. The greenhouse covering is unfolded and contacts the opened umbrella surface, and the increased contact area between the covering forming the arched roof and the rainwater is utilized to make the rainwater slide down along the arched roof into the rain collecting umbrella.

[0017] In summary, the present invention has the following beneficial technical effects: 1. The present invention proposes a rainwater recycling system and method for facility agriculture, which has the function of efficiently collecting rainwater and snow water. In the rain-collecting umbrella, the pressure sensor can accurately sense the rainwater pressure and drive the folding umbrella ribs to open and collect rainwater; the temperature sensor can detect the low temperature on snowy days to start the heating wire to melt the snow, and at the same time the pressure sensor cooperates to open the folding umbrella ribs to collect snow water, thereby realizing the effective collection of rainwater and snow water according to seasonal changes, greatly improving the utilization rate of water resources, solving the problem of snow water collection in winter, and making full use of natural precipitation in different forms. At the same time, the rain-collecting umbrella is folded when there is no rain to prevent birds from nesting in it.

[0018] 2. The present invention proposes a rainwater recycling system and method for facility agriculture. The greenhouse frame is retractable. When unfolded, the greenhouse film contacts the rain collection umbrella. The arched roof is used to increase the rainwater contact area, so that the rainwater can slide smoothly into the rain collection umbrella, further improving the rainwater collection efficiency and providing sufficient water for subsequent irrigation. More importantly, when the greenhouse is retracted, natural rainwater can be used to flush the soil of crops, taking away excess salt in the soil, effectively preventing soil salinization, maintaining the healthy state of the soil, and ensuring the growth and yield of crops.

[0019] 3. The primary treatment mechanism in the sedimentation box of the present invention pre-treats rainwater through multiple steps of sedimentation, filtration and adsorption. The fine filter net in the sedimentation area first filters large particles of impurities, and the activated carbon adsorption net in the treatment area adsorbs harmful substances, effectively removing pollutants in rainwater, improving water quality, and providing preliminary guarantee for subsequent irrigation water. The rainwater interception basket and composite flow filter in the filtration mechanism further filter the rainwater. The cylindrical basket, semi-enclosed filter net and sewage storage bin of the rainwater interception basket can effectively intercept impurities and store pollutants; the baffle plate and filter basket of the composite flow filter further remove fine particles and impurities in the water through deflection and filtration, so that the rainwater can be purified more finely.

[0020] 4. The design of the water storage unit of the present invention is scientific and reasonable. The PP water storage module is wrapped by a composite geomembrane, in which the ordinary waterproof layer and the root puncture-resistant waterproof layer can effectively prevent water and prevent damage to the plant root system, ensuring the safety and stability of water storage. Parking lots can be built on the water storage unit or specific types of crops can be planted without affecting the use of the water storage unit. The interception mechanism automatically controls the opening and closing of the water inlet according to the water level in the water storage unit, improving the operating efficiency and reliability of the water storage system.

[0021] 5. Photovoltaic panels and batteries are arranged on the hollow columns of the present invention to provide energy for the heating wire and the motor of the rain collecting umbrella, making full use of solar energy, achieving energy self-sufficiency, and having the advantages of energy saving and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the cooperation between the large shed frame and the rain collecting umbrella in Example 1 of the present invention; Figure 2 is a schematic diagram of a rainwater recycling system for facility agriculture according to Example 1 of the present invention; Figure 3 is a schematic structural diagram of a rain collecting umbrella according to Embodiment 1 of the present invention; Figure 4 is a partial enlarged view of B in the rain collecting umbrella of Example 1 of the present invention; Figure 5 is a schematic diagram of a half-section structure of the intercepting mechanism of Example 1 of the present invention; Figure 6 is a partial enlarged view of A in the large shed frame body of Example 1 of the present invention; Figure 7 It is a structural schematic diagram of the rainwater sewage interception hanging basket according to Example 1 of the present invention.

[0023] Among them, 1. greenhouse frame; 101. greenhouse film; 102. fixed bracket; 103. movable bracket; 104. roller; 105. track; 106. cross brace; 107. limit slide; 2. rain collecting umbrella; 201. umbrella surface; 202. folding umbrella rib; 203. heating wire; 204. rainwater collector; 205. support frame; 206. motor; 207. drive screw; 208. drive plate; 209. pull rod; 210. slider; 211. reinforcement rod; 212. photovoltaic panel; 3. hollow column; 301. overflow port; 302. water delivery hose; 4. sedimentation box; 401. first partition; 40 2. Second partition; 403. Fine filter screen; 404. Activated carbon adsorption screen; 405. Abandoned flow pipe; 5. Filter mechanism; 501. Rainwater sewage interception hanging basket; 502. Sewage interception finished product well; 503. Vertical filter screen; 504. Semi-enclosed filter screen; 505. Sewage storage bin; 506. Composite flow filter; 6. Water storage unit; 601. PP water storage module; 602. Water transfer well; 603. Lifting pump; 7. Intercepting mechanism; 701. Water outlet cavity; 702. Lining screen; 703. Float; 704. Pull rope; 705. Top plate; 706. Intercepting cover plate; 707. Water outlet; 708. Torsion spring; 8. Ultraviolet disinfector. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0025] Example 1 Reference Figure 1 and Figure 2 A rainwater recycling system for facility agriculture in this embodiment includes a planting area, guide rails arranged on both sides of the planting area, a retractable greenhouse frame 1 slidingly arranged along the guide rails to form an arched roof, a greenhouse covering 101 laid and fixed on the outer surface of the greenhouse frame 1, a plurality of rain collecting umbrellas 2 erected on hollow columns 3, a sedimentation box 4 connected to the hollow columns 3 through a water hose 302, a filtering mechanism 5 connected to the sedimentation box 4 through a pipeline, and a water storage unit 6 connected to the filtering mechanism 5 through a water pipe. When the greenhouse covering 101 is unfolded and the rain collecting umbrella 2 is held up, the rain collecting umbrella 2 is in contact with the greenhouse covering 101.

[0026] The combination of the retractable greenhouse frame 1 and the greenhouse film 101 forms a relatively closed planting space. When the greenhouse frame 1 is unfolded, the arched structure allows rainwater to slide naturally along the roof, reducing the accumulation of rainwater on the roof. The rain collecting umbrella 2 is in close contact with the greenhouse film 101, achieving seamless collection of rainwater and improving the efficiency of the rain collecting umbrella 2 in collecting rainwater.

[0027] The filtering mechanism 5 includes a rainwater pollution interception basket 501 and a composite flow filter 506 connected in sequence, the water storage unit 6 includes an array-stacked PP water storage module 601, a composite geomembrane wrapping the array-stacked PP water storage module 601, a water delivery well 602 arranged in the water storage unit 6 for delivering water to the planting area, a lifting pump 603 is provided outside the water delivery well 602, and the composite geomembrane includes a common waterproof layer and a root penetration resistant waterproof layer from the inside to the outside.

[0028] The rainwater sewage interception hanging basket 501 includes a sewage interception finished product well 502, a hanging basket nested in the sewage interception finished product well 502, and the hanging basket includes a vertically arranged vertical filter screen 503, a semi-enclosed filter screen 504 arranged along the inner wall of the sewage interception finished product well 502, and a sewage storage bin 505 connected to the semi-enclosed filter screen 504.

[0029] The composite flow filter 506 includes a composite flow finished product well, a baffle plate disposed on one side of the composite flow finished product well, and a filter basket disposed on the other side of the composite flow finished product well, wherein the baffle plate includes a plurality of transversely staggered metal baffles.

[0030] The water inlet end of the rainwater interception basket 501 is provided with a sewage storage bin 505, which can store larger impurities and pollutants that mistakenly flow into the rainwater, such as leaves, branches, mud and sand, etc. The semi-enclosed filter screen 504 can further filter out fine impurities. The combination of the vertical filter screen 503 and the semi-enclosed filter screen 504 improves the filtering efficiency. The composite flow filter 506 is composed of a plurality of transversely staggered metal baffles. When rainwater passes through the baffle, the direction of the water flow will change many times, forming a baffle. This baffle effect increases the contact time and contact area between rainwater and the filter, so that the tiny particles and impurities in the rainwater can be better intercepted and precipitated. The filter basket is made of fine filter material, which can effectively remove the fine impurities remaining in the rainwater. A variety of filtering measures can effectively reduce the impurities in the water entering the water storage unit 6 and extend the service life of the PP water storage module 601.

[0031] The hollow column 3 is provided with a photovoltaic panel 212 and a battery. The rain collecting umbrella 2 includes an inverted umbrella 201, a folding umbrella rib 202 accommodated in the umbrella 201, and a heating wire 203 spirally arranged in the umbrella 201. The heating wire 203 is connected to the battery. A rainwater collector 204 is provided at the upper end of the hollow column 3. A support frame 205 is set on the top of the rainwater collector 204. A motor 206 connected to the battery is provided in the support frame 205. A driving screw 207 is longitudinally arranged in the support frame 205, and a driving plate 208 is arranged on the driving screw 207. The driving plate 208 is connected to the folding umbrella rib 202 through a pull rod 209. The umbrella surface 201 is rectangular after being propped up. The top of the rainwater collector 204 is closed, and the rainwater collector 204 has holes around and at the bottom, and the bottom is connected to the hollow column 3. Filters are provided at the openings around the rainwater collector 204, and the hollow column 3 is connected to the sedimentation tank 4 through a water hose 302.

[0032] Reference Figure 3 and Figure 4 , B represents Figure 3 A partial enlarged view of the Zhongji umbrella 2, wherein the folding rib 202 is hinged to the rainwater collector 204, one end of the pull rod 209 is hinged to the driving plate 208, and the other end of the pull rod 209 is hinged to the middle part of the folding rib 202, a slider 210 is provided on the folding rib 202, a reinforcing rod 211 is provided between the slider 210 and the support frame 205, one end of the reinforcing rod 211 is hinged to the slider 210, and the other end of the reinforcing rod 211 is hinged to the support frame 205.

[0033] A pressure sensing switch including a pressure sensor is provided on the top of the rainwater collector 204 , a temperature sensing switch including a temperature sensor is provided on the top of the support frame 205 , the pressure sensing switch is connected to the motor 206 , and the temperature sensing switch is connected to the heating wire 203 .

[0034] The photovoltaic panel 212 on the hollow column 3 converts solar energy into electrical energy and stores it in the battery. The battery provides power support for the heating wire 203 and the motor 206 of the rain collecting umbrella 2. When the temperature sensor detects a low temperature signal (snowy weather) and detects the pressure of the snow falling into the rain collecting umbrella 2, the heating wire 203 starts to melt the snow falling into the umbrella surface 201. At the same time, the motor 206 rotates to make the driving plate 208 descend, and the folding umbrella ribs 202 unfold, so that the snow water can be smoothly collected and processed. When the rain or snow stops, when the pressure sensor cannot detect the pressure, the motor 206 drives the reverse rotation to make the driving plate 208 rise, and the folding umbrella ribs 202 close. The pressure sensor and the temperature sensor work together to ensure that both rainwater and snowwater can be efficiently collected and processed. The openings around the rainwater collector 204 are provided with filters to filter out fallen leaves or other large impurities.

[0035] After a period of time, the overflow port 301 on the hollow column 3 is closed, the water delivery hose 302 is disassembled from the sedimentation tank 4, and the collected rainwater is used to reversely fill the rain collecting umbrella 2, so that the impurities in the rain collecting umbrella 2 can be cleaned.

[0036] Reference Figure 6 , A represents Figure 1 A partial enlarged view of a medium-sized shed frame body 1, wherein the shed frame body 1 comprises a fixed bracket 102, and a plurality of movable brackets 103 connected to the fixed bracket 102 via a telescopic mechanism, wherein the lower end of the movable bracket 103 is provided with a roller 104 sliding in a guide rail, and the telescopic mechanism comprises a cross brace 106 arranged between the movable bracket 103 and the movable bracket 103 and between the movable bracket 103 and the fixed bracket 102, and both the fixed bracket 102 and the movable bracket 103 are provided with a limiting slide groove 107 for sliding of the cross brace 106.

[0037] Reference Figure 2 A primary treatment mechanism is provided in the sedimentation box 4, and the primary treatment mechanism includes a first partition 401 and a second partition 402. A gap is left between the first partition 401 and the second partition 402 and the top of the sedimentation box 4. The first partition 401 and the second partition 402 are longitudinally arranged in the middle of the sedimentation box 4. The first partition 401 and the second partition 402 divide the sedimentation box 4 into a sedimentation area, a treatment area and a clean water area. A fine filter screen 403 is transversely provided in the sedimentation area, and multiple groups of activated carbon adsorption screens 404 are transversely provided in the treatment area. A discard pipe 405 is provided at the bottom of the sedimentation area.

[0038] Reference Figure 5An overflow port 301 is provided on the hollow column 3, the water pipe extends into the water storage unit 6, and a cut-off mechanism 7 is provided at the lower end of the water pipe extending into the water storage unit 6. The cut-off mechanism 7 includes a water outlet cavity 701 connected to the water outlet end of the water pipe, a lining net 702 arranged at the bottom of the water outlet cavity 701, a floating ball 703 arranged on the lining net 702, a top plate 705 connected by a pull rope 704, and a cut-off cover plate 706 located on the upper side of the top plate 705 and abutted by the top plate 705. A water outlet 707 is provided on the outer wall of the water outlet cavity 701, and a torsion spring 708 is provided at the rotating axis of the top plate 705. In the initial state, the pull rope 704 pulls the top plate 705 and the cut-off cover plate 706 is opened, and the water outlet 707 is communicated with the water outlet cavity 701.

[0039] The hollow column 3 is provided with an overflow port 301, mainly to prevent the sedimentation tank 4 from processing rainwater slowly, causing rainwater to flow back and overflow.

[0040] Reference Figure 2 In the sedimentation tank 4, rainwater first enters the sedimentation area. The fine filter 403 in the sedimentation area performs preliminary filtration on the incoming rainwater and intercepts large particles of impurities. As the rainwater continues to flow in, the water level gradually rises. When it is higher than the first partition 401, the rainwater flows into the treatment area. The multiple groups of activated carbon adsorption nets 404 in the treatment area adsorb harmful substances in the rainwater. After the treated rainwater exceeds the second partition 402, it flows into the clean water area and finally enters the filter mechanism 5 through the pipeline.

[0041] Reference Figure 7 The rainwater interception basket 501 and the composite flow filter 506 in the filtering mechanism 5 perform deep filtration on the rainwater. The rainwater first enters the cylindrical basket in the interception product well 502, and the impurities are stored in the sewage storage bin 505 at the water inlet end of the basket, and the semi-enclosed filter net at the water outlet further filters the fine impurities. Then, the rainwater enters the composite flow product well, and the tiny particles and impurities remaining in the water are removed through the deflection and countercurrent effect of the baffle on one side.

[0042] Reference Figure 5 , the filtered rainwater flows into the water storage unit 6 through the water pipe. When the water level in the water storage unit 6 rises, the float 703 of the interception mechanism 7 floats up, and pulls the top plate 705 through the pull rope 704, so that the top plate 705 supports the interception cover 706, thereby closing the water inlet. When water is needed, the lifting pump 603 outside the water well 602 pumps water out of the water storage unit 6, and the pumped water passes through the ultraviolet sterilizer 8 and is then transported to the planting area for irrigation. As the water level drops, the float 703 restores gravity, pulls the top plate 705 to open the interception cover 706, and continues to receive the filtered rainwater. Among them, the water pipe connected to the interception mechanism 7 is provided with a vertical overflow pipe. When the water storage unit 6 is full of water, the overflow pipe is used to flow out excess water.

[0043] In facility agriculture, due to the obstruction of the greenhouse, the process of natural soil flushing by rainwater cannot be achieved, resulting in soil salt accumulation. By using a telescopic greenhouse, rainwater flushing of the soil can be achieved. When the soil needs to be flushed with salt, the greenhouse frame 1 can be retracted, and rainwater will penetrate into the soil, dissolving the salt in the soil and taking it away from the soil surface, thereby reducing the salt content of the soil surface and effectively preventing the occurrence of soil salinization. Regular rainwater flushing can not only take away salt, but also improve the physical structure of the soil. The flow of rainwater can dredge the pores between soil particles, improve the air permeability and water permeability of the soil, which is beneficial to the growth and respiration of crop roots, further promote the growth and development of crops, and improve the stress resistance and yield of crops.

[0044] When it is necessary to protect the crops in the greenhouse, pull the greenhouse frame 1 so that one side of the rain collecting umbrella 2 is close to the greenhouse film 101. The unfolding of the greenhouse film 101 increases the rain collecting area and allows more rainwater to flow into the rain collecting umbrella 2. Regardless of whether the greenhouse is used or not, the rain collecting umbrella 2 can collect rainwater and even snow water.

[0045] Example 2 This embodiment provides a rainwater recycling method for facility agriculture, comprising: Multiple rain collecting umbrellas collect rainwater. When rain falls, the pressure sensor in the umbrella detects the pressure signal of rainwater, and the driving plate moves down to open the folding umbrella ribs. When snow falls, the temperature sensor detects the low temperature signal, and the heating wire is started to heat the snow falling into the umbrella surface. At the same time, the pressure sensor detects the pressure signal, and the driving plate moves down to open the folding umbrella ribs. When the rain stops, the pressure sensor loses the pressure signal, and the driving plate moves up to fold the folding umbrella ribs. The sedimentation tank pre-treats the collected rainwater. The rainwater settles in the sedimentation area. The fine filter screen filters the rainwater flowing into the sedimentation area. The water level is higher than the first partition and flows into the treatment area. Multiple groups of activated carbon adsorption nets adsorb the rainwater flowing into the treatment area. The water level exceeds the second partition and flows into the clear water area and flows into the filtration mechanism through the pipeline. The initial rain flows into the sedimentation area and flows out of the sedimentation tank through the abandoned flow pipe. The filtering mechanism performs interception basket filtration and composite flow filtration on rainwater. After filtration, the rainwater flows into the water storage unit through the interception mechanism. In the water storage unit, when the water surface causes the float of the interception mechanism to float up, the float loses gravity, and the top plate presses against the interception cover plate to close the water inlet end of the water storage unit. When the lifting pump transfers water from the water storage unit to the outside, the float restores gravity after the water surface drops, and the float pulls the top plate to open the interception cover plate. The greenhouse frame is unfolded, and the cross braces are pulled to slide and be fixed in the limiting slide grooves. The greenhouse covering is unfolded and contacts the opened umbrella surface, and the increased contact area between the covering forming the arched roof and the rainwater is utilized to make the rainwater slide down along the arched roof into the rain collecting umbrella.

[0046] The above are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A rainwater recycling system for facility agriculture, characterized in that: The invention comprises a planting area, guide rails arranged on both sides of the planting area, a retractable greenhouse frame (1) slidingly arranged along the guide rails to form an arched greenhouse roof, a greenhouse covering film (101) laid and fixed on the outer surface of the greenhouse frame (1), a plurality of rain collecting umbrellas (2) erected on a hollow column (3), a sedimentation box (4) connected to the hollow column (3) through a water hose (302), a filtering mechanism (5) connected to the sedimentation box (4) through a pipeline, and a water storage unit (6) connected to the filtering mechanism (5) through a water pipe. When the greenhouse covering film (101) is unfolded and the rain collecting umbrellas (2) are held up, the rain collecting umbrellas (2) are in contact with the greenhouse covering film (101).

2. A rainwater recycling system for facility agriculture according to claim 1, characterized in that: The filtering mechanism (5) comprises a rainwater interception basket (501), the water storage unit (6) comprises PP water storage modules (601) stacked in an array, a composite geomembrane wrapping the PP water storage modules (601) stacked in an array, a water delivery well (602) arranged in the water storage unit (6) for delivering water to a planting area, a lifting pump (603) being arranged outside the water delivery well (602), and the composite geomembrane comprising a common waterproof layer and a root-penetration-resistant waterproof layer from the inside to the outside.

3. A rainwater recycling system for facility agriculture according to claim 2, characterized in that: The rainwater sewage interception hanging basket (501) includes a sewage interception finished product well (502), a hanging basket nested in the sewage interception finished product well (502), and the hanging basket includes a vertical filter screen (503) arranged vertically, a semi-enclosed filter screen (504) arranged along the inner wall of the sewage interception finished product well (502), and a sewage storage bin (505) connected to the semi-enclosed filter screen (504).

4. A rainwater recycling system for facility agriculture according to claim 1, characterized in that: The hollow column (3) is provided with a photovoltaic panel (212) and a storage battery. The rain collecting umbrella (2) comprises an inverted umbrella-shaped umbrella surface (201), a folding umbrella rib (202) accommodated in the umbrella surface (201), and a heating wire (203) spirally arranged in the umbrella surface (201), wherein the heating wire (203) is connected to the storage battery. A rainwater collector (204) is provided at the upper end of the hollow column (3), and a support frame (205) is arranged on the top of the rainwater collector (204). A motor (206) connected to the storage battery is provided in the support frame (205). A driving screw rod (207) is longitudinally arranged in the support frame (205), and a driving plate (208) is arranged on the driving screw rod (207). The driving plate (208) is connected to the folding umbrella rib (202) through a pull rod (209). The umbrella surface (201) is rectangular after being propped up. The top of the rainwater collector (204) is closed. The rainwater collector (204) has holes around and at the bottom, and the bottom is connected to the hollow column (3). Filters are arranged at the holes around the rainwater collector (204). The hollow column (3) is connected to the sedimentation tank (4) through a water hose (302).

5. A rainwater recycling system for facility agriculture according to claim 4, characterized in that: The folding umbrella rib (202) is hinged on the rainwater collector (204), one end of the pull rod (209) is hinged on the driving plate (208), the other end of the pull rod (209) is hinged on the middle part of the folding umbrella rib (202), a slider (210) is provided on the folding umbrella rib (202), a reinforcing rod (211) is provided between the slider (210) and the support frame (205), one end of the reinforcing rod (211) is hinged on the slider (210), and the other end of the reinforcing rod (211) is hinged on the support frame (205).

6. A rainwater recycling system for facility agriculture according to claim 5, characterized in that: A pressure sensing switch including a pressure sensor is provided on the top of the rainwater collector (204), a temperature sensing switch including a temperature sensor is provided on the top of the support frame (205), the pressure sensing switch is connected to the motor (206), and the temperature sensing switch is connected to the heating wire (203).

7. A rainwater recycling system for facility agriculture according to claim 1, characterized in that: The greenhouse frame body (1) comprises a fixed support (102), and a plurality of movable supports (103) connected to the fixed support (102) via a telescopic mechanism, wherein the lower end of the movable support (103) is provided with a roller (104) sliding in a guide rail, and the telescopic mechanism comprises a cross brace (106) arranged between the movable support (103) and between the movable support (103) and the fixed support (102), and both the fixed support (102) and the movable support (103) are provided with a limiting slide groove (107) for sliding the cross brace (106).

8. The rainwater recycling system for facility agriculture according to claim 1, characterized in that: A primary treatment mechanism is provided in the sedimentation box (4), and the primary treatment mechanism comprises a first partition (401) and a second partition (402), wherein a gap is left between the first partition (401) and the second partition (402) and the top of the sedimentation box (4), and the first partition (401) and the second partition (402) are longitudinally arranged in the middle of the sedimentation box (4), and the first partition (401) and the second partition (402) divide the sedimentation box (4) into a sedimentation area, a treatment area and a clean water area, and the sedimentation area is transversely provided with a fine filter net (403), and the treatment area is transversely provided with multiple groups of activated carbon adsorption nets (404), and a discard pipe (405) is provided at the bottom of the sedimentation area.

9. A rainwater recycling system for facility agriculture according to claim 1, characterized in that: The hollow column (3) is provided with an overflow port (301), the water pipe extends into the water storage unit (6), and a cut-off mechanism (7) is provided at the lower end of the water pipe extending into the water storage unit (6), the cut-off mechanism (7) comprising a water outlet cavity (701) connected to the water outlet end of the water pipe, a lining net (702) arranged at the bottom of the water outlet cavity (701), a floating ball (703) arranged on the lining net (702), and a floating ball (703) connected by a pull rope (704). A top plate (705), a flow intercepting cover plate (706) located on the upper side of the top plate (705) and abutted by the top plate (705), a water outlet (707) is provided on the outer wall of the water outlet cavity (701), a torsion spring (708) is provided at the rotation axis of the top plate (705), and in an initial state, the pull rope (704) pulls the top plate (705) and the flow intercepting cover plate (706) is opened, and the water outlet (707) is connected to the water outlet cavity (701).

10. A rainwater recycling method for facility agriculture, comprising: A plurality of rain collecting umbrellas (2) collect rainwater. When rainwater falls, a pressure sensor in an umbrella surface (201) detects a pressure signal of rainwater, and a driving plate (208) moves downward to open the folding umbrella ribs (202). When snow falls, a temperature sensor detects a low temperature signal, and a heating wire (203) is activated to heat the snow falling into the umbrella surface (201). At the same time, the pressure sensor detects a pressure signal, and the driving plate (208) moves downward to open the folding umbrella ribs (202). When the rain stops, the pressure sensor loses the pressure signal, and the driving plate (208) moves upward to fold the folding umbrella ribs (202). The sedimentation box (4) pre-treats the collected rainwater, and the rainwater is precipitated in the sedimentation area. The fine filter net (403) filters the rainwater flowing into the sedimentation area. When the water level is higher than the first partition (401), it flows into the treatment area. The multiple groups of activated carbon adsorption nets (404) adsorb the rainwater flowing into the treatment area. When the water level exceeds the second partition (402), it flows into the clean water area and flows into the filtering mechanism (5) through the pipeline. The initial rainwater flows into the sedimentation area and flows out of the sedimentation box (4) through the abandoned flow pipe (405); The filtering mechanism (5) performs interception basket filtration and composite flow filtration on rainwater. After filtration, the rainwater flows into the water storage unit (6) through the interception mechanism (7). In the water storage unit (6), when the water surface causes the float (703) of the interception mechanism (7) to float, the float (703) loses gravity, and the top plate (705) presses against the interception cover plate (706) to close the water inlet end of the water storage unit (6). When the lifting pump (603) transports water from the water storage unit (6) to the outside, the float (703) recovers gravity after the water surface drops, and the float (703) pulls the top plate (705) to open the interception cover plate (706). The greenhouse frame (1) is unfolded, and the movable bracket (103) is pulled to make the cross braces (106) slide and be fixed in the limiting slide groove (107), so that the greenhouse covering film (101) is unfolded and contacts the opened umbrella surface (201), and the contact area between the covering film forming the arched roof and the rainwater is increased, so that the rainwater slides downward along the arched roof into the rain collecting umbrella (2).

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