CN108732332B - Device and method for measuring drip irrigation soil wetting front expansion - Google Patents
Device and method for measuring drip irrigation soil wetting front expansion Download PDFInfo
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- CN108732332B CN108732332B CN201810792929.0A CN201810792929A CN108732332B CN 108732332 B CN108732332 B CN 108732332B CN 201810792929 A CN201810792929 A CN 201810792929A CN 108732332 B CN108732332 B CN 108732332B
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Abstract
The invention discloses a device for measuring the expansion of a drip irrigation soil wetting front, which comprises: the device comprises a head fixing frame, a tail fixing frame, a water tank, a soil box and a supporting plate; the device comprises a submersible pump, a water return port, a water return valve, a gate valve, a flexible pipe, a timer, a filter and a pressure gauge; the device comprises a box body formed by toughened glass, wherein the box body is separated into a soil box and a water tank through the toughened glass; the head fixing frame is arranged in the middle of the front end of the soil box; the tail fixing frame is arranged in the middle of the rear end of the soil box; the supporting plates are hung in clamping grooves on two sides of the soil box through outer convex bayonets at two ends; the submersible pump is arranged in the water tank; the invention can obtain different water dropper flow through simple operation, and further determine the drip irrigation soil wetting front expansion process.
Description
Technical Field
The invention relates to the technical field of drip irrigation, in particular to a device and a method for measuring the wetting front expansion of drip irrigation soil.
Background
The drip irrigation is an efficient water-saving irrigation method, and can save water by 30-50% compared with the traditional land irrigation methods such as furrow irrigation, flood irrigation and the like. However, since drip irrigation is local irrigation, only the root zone soil is wetted, and the size and shape of the soil wetting body directly determine the growth condition of crops. In order to obtain reasonable drip irrigation design parameters (such as drip emitter flow, water inflow, drip emitter spacing, capillary spacing and the like), the change condition of the soil wetting range along with the parameters under different soil conditions must be known, and previous workers have studied the drip irrigation soil wetting front change process through a drip irrigation soil box test. In the previous study, a needle head is generally adopted to simulate a dripper to regulate the flow of the dripper, and a Marshall bottle is utilized to conduct pressure-stabilizing water supply to measure the expansion of a drip irrigation soil wetting front, but the method also has the disadvantages that firstly, the flow of the dripper needs to be controlled by adjusting the height of the Marshall bottle, a test frame with adjustable height needs to be arranged in the test process, and the risk of being knocked over exists; secondly, the method is not suitable for special drip irrigation modes such as under-film drip irrigation, underground drip irrigation and the like.
Disclosure of Invention
The invention provides a device for measuring the wetting front expansion of drip irrigation soil, which can obtain different drip head flow rates through simple operation and is also suitable for special drip irrigation modes such as under-film drip irrigation, underground drip irrigation and the like.
In order to realize the functions, the invention adopts a technical scheme that: the device for measuring the wetting front expansion of drip irrigation soil comprises a head fixing frame, a tail fixing frame, a water tank, a soil box, a supporting plate, a submersible pump, a water return port, a water return valve, a gate valve, a flexible pipe, a timer, a filter and a pressure gauge; the box body of the device is composed of toughened glass, and the box body is separated into a soil box and a water box through the toughened glass; casters are arranged at four corners of the box body; the head fixing frame is arranged in the middle of the front end of the soil box; the tail fixing frame is arranged in the middle of the rear end of the soil box; angle steel protection frames are arranged at four edges of the box body; clamping grooves are formed in the angle steel protective frames on the same surface of the water tank and the soil tank; the supporting plates are hung in clamping grooves on two sides of the soil box through outer convex bayonets at two ends; the submersible pump is arranged in the water tank; the submerged pump is connected with the PVC pipe; the PVC pipe is divided into two waterways, one waterway is provided with a water return valve and a water return port, and the other waterway is provided with a gate valve; the gate valve is connected with the flexible pipe through a PVC pipe; the flexible pipe is connected with the timer through a pipe clamp; the timer is connected with the filter through a PVC pipe; the filter is connected with the pressure gauge through a PVC pipe; the tail fixing frame is provided with a tail vertical pipe.
Preferably, the head fixing frame is fixed on the front wall of the soil box through an adjusting screw, the head fixing frame is provided with a head vertical pipe, the head vertical pipe is marked with scales, the head vertical pipe can move up and down along a pipe clamping opening behind the head fixing frame, a plug is arranged on the head vertical pipe, the head vertical pipe is connected with one end of a drip irrigation belt (pipe) through a three-dimensional tee joint, and one drip head in the drip irrigation belt (pipe) drips into a measuring cup.
Preferably, the tail fixing frame is fixed on the rear wall of the soil box through an adjusting screw, the tail fixing frame is provided with a tail vertical pipe, the tail vertical pipe is marked with scales, the tail vertical pipe can move up and down along a pipe clamping opening behind the tail fixing frame, one end of the tail vertical pipe is connected with the other end of the drip irrigation belt (pipe), and an automatic exhaust valve is arranged on the tail vertical pipe.
Preferably, one side of the soil box is provided with an openable soil box side door, soil is conveniently replaced after the test is finished, horizontal lines are drawn on the front and rear faces of the soil box at intervals of 5cm, the soil filling level in layered tamping is guaranteed, the central positions on the front and rear walls of the soil box are arranged at the positions of 10cm, a round hole is arranged at the intervals of 5cm, the aperture is 1.7cm, and the drip irrigation belt (pipe) penetrates through the drip irrigation belt without being filled with silica gel flat plugs.
Preferably, the positions of the support plate and the drip irrigation belt (pipe) are kept horizontal, the height is adjusted according to the burial depth of the drip irrigation belt (pipe), a timer, a filter, a pressure gauge and the like are arranged on the support plate platform, the support plate is sunken downwards corresponding to the position of the drip irrigation belt (pipe) and is used for placing a measuring cup, one of the drip irrigation belt (pipe) drips by the drip vector cup, and therefore the flow of the drip heads is calibrated.
Preferably, the timer is used for accurately controlling the irrigation quantity, and the irrigation time is calculated according to the irrigation quantity and controlled by the timer because the irrigation quantity of the soil box test is only a few liters generally, and the existing metering devices such as water meters and the like are difficult to accurately meter.
Preferably, the water tank is provided with a water tank cover, dust is prevented from falling into the water tank, and a water drain port is arranged at one end of the water tank.
Preferably, the trowelling device consists of tooth walls, teeth and a rod; teeth are arranged below the tooth walls, and rods are arranged on the tooth walls.
Preferably, the soil ramming device consists of a bottom plate, a scale shaft, a steel plate, a lifting rope and a portable handle; a scale shaft is arranged at the center of the bottom plate; a hand handle is arranged above the scale shaft; a round hole is formed in the middle of the steel plate, and a scale shaft penetrates through the steel plate; four corners of the steel plate are connected with the carrying handle through hanging ropes.
Preferably, the back wall of the soil box is stuck with mighty paper, two sides of the soil box are fixed on the angle iron guard frame by magnetic strips, and the soil wetting front expansion process line can be directly depicted on the mighty paper during the test.
Preferably, the gate valve and the water return valve regulate the operating pressure and flow of the drip tape (tube).
Preferably, the flexible tube communicates the conduit with a timer to ensure lifting of the support plate.
Preferably, the filter is used for filtering out impurities in water.
In order to solve the technical problems, the invention provides a method for measuring the wetting front expansion of drip irrigation soil, which comprises the following steps:
firstly, filling soil in layers according to the section and the designed volume weight of the soil box, calculating the required soil weight according to the thickness of each 10cm, pouring the soil into the soil box after weighing, trowelling the soil by using a trowelling device, tamping the soil by using a soil tamping device according to scale marks on the wall of the soil box, roughening the soil by using the trowelling device after the single-layer tamping is finished, and then filling the soil in the next layer;
step two, when soil is filled into the pre-buried soil layer of the drip irrigation belt (pipe), removing sealing and filling silica gel plugs on the front wall and the rear wall of the soil box, penetrating the drip irrigation belt (pipe), and connecting the water inlet end of the drip irrigation belt (pipe) with a head fixing frame with a preset height through a quick screwing joint; the water outlet of the drip irrigation belt (pipe) is connected with an end tail fixing frame with the height adjusted in advance through a quick screwing joint, and then screws of a head fixing frame and a tail fixing frame are adjusted to horizontally tighten the drip irrigation belt (pipe); it should be noted that only one dripper is left in the soil box and abuts against the wall of the soil box during point source drip irrigation, the rest drippers are required to be filled and sealed by glue to ensure no water leakage, and one dripper is left outside the soil box for flow check, so that the line source drip irrigation does not need to be treated;
step three, before the drip irrigation belt (pipe) passes through the soil box to connect the head fixing frame and the tail fixing frame, the pre-opened mighty paper passes through the drip irrigation belt (pipe) to be tightly attached to the rear wall of the soil box, the two sides of the drip irrigation belt (pipe) are fixed on the angle iron guard frame by magnetic strips, and the soil wetting front expansion process line can be directly depicted on the mighty paper during the test;
and step four, before drip irrigation, the relation between the flow of the drip heads of the drip irrigation belt (pipe) and the water supply pressure is required to be clarified, and the simple measurement can be carried out by utilizing the device, namely, different water supply pressures are obtained through the regulation and control of a gate valve and a water return valve before the soil box is filled with soil, and then the flow of the drip heads under the pressures is measured, so as to obtain the flow-pressure curve of the drip heads. According to the designed flow rate of the drippers during the irrigation, the reading of the pressure gauge is adjusted to a required value through a valve, the irrigation time is calculated according to the amount of the irrigated water, the time required by the drip irrigation is set through a timer, finally, the submersible pump is started to supply water from the water tank to the soil box, and the drip irrigation is automatically stopped when the timing is finished;
and fifthly, directly drawing a soil wetting front expansion process line on mighty paper in the drip irrigation process, measuring the soil moisture content distribution condition by using soil drilling after the test is finished, digging a soil wetting section by opening a side door of a soil box during drip irrigation of a line source, taking out and airing the soil through the side door of the soil box, and performing the next test.
Compared with the prior art, the invention has the beneficial effects that:
1. after the flow-pressure relation curve of the dripper is measured, different dripper flows can be obtained by adjusting the opening of the valve, and the method is extremely simple and convenient.
2. The invention does not need to be provided with a test stand with adjustable height in the test process, and does not have the risk of the Margaret bottle being knocked over.
3. The invention is suitable for special drip irrigation modes such as under-film drip irrigation, underground drip irrigation and the like.
Drawings
FIG. 1 is a side view of an apparatus for determining a wetting front of drip irrigation soil in accordance with the present invention;
FIG. 2 is a schematic diagram of a box for measuring the spread of a drip irrigation soil wetting front in accordance with the present invention;
FIG. 3 is a block diagram of a trowelling device for determining the spread of a wet front of drip irrigation soil in accordance with the present invention;
FIG. 4 is a block diagram of a tamper apparatus for determining the spread of a wet front of drip irrigation soil in accordance with the present invention;
in fig. 1-2: 1. the hydraulic pressure type hydraulic pressure device comprises a head fixing frame, a tail fixing frame, a 3-toughened glass, a 4-water tank cover, a 5-angle steel protecting frame, a 6-clamping groove, a 7-water drain hole, a 8-trundle, a 9-water tank, a 10-soil tank, a 11-soil tank side door, a 12-supporting plate, a 13-pipe penetrating hole, a 14-tail vertical pipe, a 15-submersible pump, a 16-water return hole, a 17-water return valve, a 18-gate valve, a 19-flexible pipe, a 20-timer, a 21-filter, a 22-pressure gauge, a 23-head vertical pipe, a 24-drip irrigation belt (pipe), a 25-measuring cup, a 26-trowelling device, 27-teeth, 28-teeth walls, a 29-rod, a 30-ramming device, a 31-base plate, a 32-scale shaft, a 33-steel plate, a 34-lifting rope and a 35-portable handle.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention adopts a technical scheme that: the device for measuring the wetting front expansion of drip irrigation soil comprises a head fixing frame 1, a tail fixing frame 2, a water tank 9, a soil box 10, a supporting plate 12, a submersible pump 15, a water return port 16, a water return valve 17, a gate valve 18, a flexible pipe 19, a timer 20, a filter 21 and a pressure gauge 22; the box body of the device consists of toughened glass 3, and a soil box 10 and a water tank 9 are separated from the box body through the toughened glass 3; the four corners of the box body are provided with casters 8; the head fixing frame 1 is arranged at the middle position of the front end of the soil box 10; the tail fixing frame 2 is arranged in the middle of the rear end of the soil box 10; the four edges of the box body are provided with angle steel protective frames 5; the clamping grooves 6 are formed in the angle steel protective frames 5 on the same surface of the water tank 9 and the soil tank 10; the supporting plate 12 is hung in the clamping grooves 6 at two sides of the soil box 10 through outer convex bayonets at two ends; the submersible pump 15 is arranged in the water tank 9; the submerged pump 15 is connected with the PVC pipe; the PVC pipe is divided into two waterways, one waterway is provided with a water return valve 17 and a water return port 16, and the other waterway is provided with a gate valve 18; the gate valve 18 is connected with the flexible pipe 19 through a PVC pipe; the flexible pipe 19 is connected with the timer 20 through a pipe clamp; the timer 20 is connected with the filter 21 through a PVC pipe; the filter 21 is connected with the pressure gauge 22 through a PVC pipe; the tail mount 2 is provided with a tail standpipe 14.
The head fixing frame 1 is fixed on the front wall of the soil box 10 through an adjusting screw, the head fixing frame 1 is provided with a head vertical pipe 23, the head vertical pipe 23 is marked with scales, the head vertical pipe 23 can move up and down along a pipe clamping opening behind the head fixing frame 1, a plug is arranged on the head vertical pipe 23, the head vertical pipe 23 is connected with one end of a drip irrigation belt (pipe) 24 through a three-dimensional tee, and one drip of the drip irrigation belts (pipes) 24 drips into a measuring cup 25.
The tail fixing frame 2 is fixed on the rear wall of the soil box 10 through an adjusting screw, the tail fixing frame 2 is provided with a tail vertical pipe 14, the tail vertical pipe 14 is marked with scales, the tail vertical pipe 14 can move up and down along a pipe clamping opening behind the tail fixing frame 2, one end of the tail vertical pipe 14 is connected with the other end of the drip irrigation belt (pipe) 24, and the tail vertical pipe 14 is provided with an automatic exhaust valve.
One side of the soil box 10 is provided with an openable soil box side door 11, soil is conveniently replaced after the test is finished, horizontal lines are drawn on the front and rear faces of the soil box 10 at intervals of 5cm, the soil filling level in layered tamping is guaranteed, the central positions on the front and rear walls of the soil box 10 are set from the 10cm position, a round hole is arranged at the interval of 5cm, the aperture is 1.7cm, the drip irrigation belt (pipe) 24 penetrates, and the drip irrigation belt (pipe) is not filled with silica gel flat plugs.
The positions of the support plate 12 and the drip irrigation belt (pipe) 24 are kept horizontal, the height is adjusted according to the burial depth of the drip irrigation belt (pipe) 24, a timer 20, a filter 21, a pressure gauge 22 and the like are arranged on a platform of the support plate 12, the position of the support plate 12 corresponding to the drip irrigation belt (pipe) 24 is sunken downwards and is used for placing a measuring cup 25, and one of the drip irrigation belt (pipe) 24 drips by the drip vector cup, so that the drip flow is calibrated.
The timer 20 is used for precisely controlling the irrigation amount, and since the test irrigation amount of the soil box 10 is generally only a few liters, the existing metering devices such as a water meter and the like are difficult to accurately meter, and therefore the time for calculating the irrigation according to the irrigation amount is controlled by adopting the timer 20.
The water tank 9 is provided with a water tank cover 4 for preventing the water tank from falling into dust, and one end of the water tank 9 is provided with a water drain port 7.
The trowelling device 26 consists of a tooth wall 28, teeth 27 and a rod 29; teeth 27 are arranged below the tooth wall 28, and a rod 29 is arranged on the tooth wall 28.
The ramming device 30 consists of a bottom plate 31, a scale shaft 32, a steel plate 33, a lifting rope 34 and a carrying handle 35; the center of the bottom plate 31 is provided with a scale shaft 32; a carrying handle 35 is arranged above the scale shaft 32, and the carrying handle 35 is a handle; a round hole is formed in the middle of the steel plate 33, and the scale shaft 32 penetrates through the steel plate 33; the four corners of the steel plate 33 are connected to the carrying handle 35 by a hanging rope 34.
The back wall of the soil box 10 is stuck with mighty paper, two sides of the soil box are fixed on the angle iron guard 5 by magnetic strips, and the soil wetting front expansion process line can be directly depicted on the mighty paper during test.
The gate valve 18 and the return valve 17 regulate the operating pressure and flow of the drip tape (tube) 24.
The flexible tube 19 communicates the tubing with a timer 20 to ensure lifting and lowering of the support plate 12.
The filter 21 filters out impurities in the water.
In order to solve the technical problems, the invention provides a method for measuring the wetting front expansion of drip irrigation soil, which comprises the following steps:
firstly, filling soil in layers according to the section and the designed volume weight of the soil box 10, calculating the required soil weight according to the thickness of each 10cm, pouring the soil into the soil box 10 after weighing, trowelling the soil by using a trowelling device 26, tamping the soil by using a tamping device 30 according to scale marks on the wall of the soil box 10, roughening by using the trowelling device 26 after the monolayer is tamped, and then filling the soil in the next layer;
step two, when soil is filled into the pre-buried soil layer of the drip irrigation belt (pipe) 24, removing sealing silica gel plugs on the front wall and the rear wall of the soil box 10, which correspond to the pipe holes, penetrating the drip irrigation belt (pipe) 24, wherein the water inlet end of the drip irrigation belt (pipe) 24 is connected with a head fixing frame 1 with a preset height through a quick screwing joint; the water outlet of the drip irrigation belt (pipe) 24 is connected with the end tail fixing frame 2 with the height adjusted in advance through a quick-screwing joint, and then screws of the head fixing frame 1 and the tail fixing frame 2 are adjusted to horizontally tighten the drip irrigation belt (pipe) 24; it should be noted that only one dripper is left in the soil box 10 and abuts against the wall of the soil box 10 during point source drip irrigation, the rest drippers are required to be filled and sealed by glue to ensure no water leakage, one dripper is left outside the soil box 10 for flow check, and the line source drip irrigation does not need to be treated in this way;
step three, before the drip irrigation belt (pipe) 24 passes through the soil box 10 to connect the head fixing frame 1 and the tail fixing frame 2, pre-opened mighty paper passes through the drip irrigation belt (pipe) 24 to be tightly attached to the rear wall of the soil box 10, and two sides of the mighty paper are fixed on the angle iron guard 5 by magnetic strips, so that a soil wetting front expansion process line can be directly depicted on the mighty paper during a test;
and step four, before drip irrigation, the relation between the flow rate and the water supply pressure of the drip irrigation tape (pipe) 24 is required to be clarified, and the simple measurement can be carried out by using the device, namely, before the soil box 10 is not filled with soil, different water supply pressures are obtained through the regulation and control of the gate valve 18 and the water return valve 16, and then the flow rates of the drip heads under the pressures are measured, so as to obtain the flow-pressure curve of the drip heads. According to the designed water dropper flow, the pressure gauge is adjusted to a required value through a valve 18, the water pouring time is calculated according to the water pouring amount, the time required by drip irrigation is set through a timer 20, finally, the submersible pump 15 is started to supply water from the water tank 9 to the soil box 10, and the drip irrigation is automatically stopped when the time is finished;
and fifthly, in the drip irrigation process, a soil wetting front expansion process line can be directly drawn on mighty paper, soil can be taken out by using a soil drill after the test is finished to determine the distribution condition of the water content of the soil, the soil box side door 11 can be opened to dig the soil wetting section during the drip irrigation of the line source, and then the soil is taken out and aired through the soil box side door 11 to carry out the next test.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. A device for determining the wetting front expansion of drip irrigation soil, characterized in that: the device comprises a head fixing frame (1), a tail fixing frame (2), a water tank (9), a soil box (10), a supporting plate (12), a submersible pump (15), a water return port (16), a water return valve (17), a gate valve (18), a flexible pipe (19), a timer (20), a filter (21) and a pressure gauge (22); the box body of the device consists of toughened glass (3), and the box body is separated into a soil box (10) and a water tank (9) through the toughened glass (3); casters (8) are arranged at four corners of the box body; the head fixing frame (1) is arranged in the middle of the front end of the soil box (10); the tail fixing frame (2) is arranged in the middle of the rear end of the soil box (10); the four edges of the box body are provided with angle steel protective frames (5); clamping grooves (6) are formed in the angle steel guard frames (5) on the same surface of the water tank (9) and the soil tank (10); the supporting plate (12) is hung in the clamping grooves (6) at two sides of the soil box (10) through the bayonet with two protruding ends; the submersible pump (15) is arranged in the water tank (9); the submerged pump (15) is connected with the PVC pipe; the PVC pipe is divided into two waterways, one waterway is provided with a water return valve (17) and a water return port (16), and the other waterway is provided with a gate valve (18); the gate valve (18) is connected with the flexible pipe (19) through a PVC pipe; the flexible pipe (19) is connected with the timer (20) through a pipe clamp; the timer (20) is connected with the filter (21) through a PVC pipe; the filter (21) is connected with the pressure gauge (22) through a PVC pipe; the tail fixing frame (2) is provided with a tail vertical pipe (14); the tail fixing frame (2) is fixed on the rear wall of the soil box (10) through an adjusting screw, the tail fixing frame (2) is provided with a tail vertical pipe (14), the tail vertical pipe (14) is marked with scales, one end of the tail vertical pipe (14) is connected with the other end of the drip irrigation belt or the drip irrigation pipe (24), and the tail vertical pipe (14) is provided with an automatic exhaust valve;
the head fixing frame (1) is fixed on the front wall of the soil box (10) through an adjusting screw, the head fixing frame (1) is provided with a head vertical pipe (23), the head vertical pipe (23) is marked with scales, a plug is arranged on the head vertical pipe (23), the head vertical pipe (23) is connected with one end of a drip irrigation belt or a drip irrigation pipe (24) through a three-dimensional tee, and one drip irrigation head of the drip irrigation belt or the drip irrigation pipe (24) drips into a measuring cup (25); each interval distance is 5cm on the front and back of soil box (10) draws the horizon, guarantees to laminate the dress soil level when ramming, and central point put on the wall of two sides around soil box (10) is put, and from 10cm position, interval 5cm has a round hole, aperture 1.7cm.
2. The apparatus for determining the spread of a wet front of drip irrigation soil according to claim 1, wherein: the back wall of the soil box (10) is stuck with mightiness paper, and two sides of the soil box are fixed on the angle iron guard frame (5) by magnetic stripes.
3. The apparatus for determining the spread of a wet front of drip irrigation soil according to claim 1, wherein: the support plate (12) and the drip irrigation belt or the drip irrigation pipe (24) are kept horizontal, the height is adjusted according to the burial depth of the drip irrigation belt or the drip irrigation pipe (24), the timer (20), the filter (21) and the pressure gauge (22) are arranged on the platform of the support plate (12), the support plate (12) is downwards sunken corresponding to the drip irrigation belt or the drip irrigation pipe (24) and is used for placing the measuring cup (25), and one of the drip irrigation belt or the drip irrigation pipe (24) drips through the drip vector cup.
4. A method of determining drip irrigation soil wetting front extension using an apparatus for determining drip irrigation soil wetting front extension as claimed in any one of claims 1 to 3, comprising the steps of:
firstly, filling soil in layers according to the section and the designed volume weight of a soil box (10), calculating the required soil weight according to the thickness of each 10cm, pouring the soil into the soil box (10), trowelling the soil by using a trowelling device (26), tamping the soil by using a soil tamping device (30) according to scale marks on the wall of the soil box (10), and after the single-layer tamping is finished, roughening the soil by using the trowelling device (26), and then filling the soil in the next layer;
step two, when soil is filled into a pre-buried soil layer of the drip irrigation belt or the drip irrigation pipe (24), taking off sealing silica gel plugs on the front wall and the rear wall of the soil box (10) corresponding to the pipe penetrating holes, penetrating the drip irrigation belt or the drip irrigation pipe (24), and connecting the water inlet end of the drip irrigation belt or the drip irrigation pipe (24) with a head fixing frame (1) with a preset height through a quick screwing joint; the water outlet of the drip irrigation belt or the drip irrigation pipe (24) is connected with an end tail fixing frame (2) with the height adjusted in advance through a quick-screwing joint, and then screws of the head fixing frame (1) and the tail fixing frame (2) are adjusted to horizontally tighten the drip irrigation belt or the drip irrigation pipe (24); it should be noted that only one dripper is left in the soil box (10) and abuts against the wall of the soil box (10) during point source drip irrigation, the rest drippers are required to be filled with glue to ensure no water leakage, one dripper is left outside the soil box (10) for flow check, and the line source drip irrigation does not need to be treated in this way;
step three, before a drip irrigation belt or a drip irrigation pipe (24) passes through a soil box (10) to connect a head fixing frame (1) and a tail fixing frame (2), passing pre-opened mighty paper through the drip irrigation belt or the drip irrigation pipe (24) to be tightly attached to the rear wall of the soil box (10), fixing two sides of the mighty paper on angle iron protective frames (5) by magnetic strips, and directly drawing a soil wetting front expansion process line on the mighty paper during a test;
step four, before drip irrigation, the relation between the flow of the drip irrigation tape or the drip irrigation pipe (24) and the water supply pressure is needed to be clarified, the simple measurement can be carried out by using the device, namely, before the soil box (10) is not filled with soil, different water supply pressures are obtained through the regulation and control of the gate valve (18) and the water return valve (16), and then the flow of the drip heads under the pressures is measured, so as to obtain the flow-pressure curve of the drip heads; according to the designed water dropper flow, the pressure gauge is adjusted to a required value through a valve (18), the water pouring time is calculated according to the water pouring amount, the time required by drip irrigation is set through a timer (20), finally, a submersible pump (15) is started to supply water from a water tank (9) to a soil box (10), and drip irrigation is automatically stopped when the time is finished;
and fifthly, directly drawing a soil wetting front expansion process line on mighty paper in the drip irrigation process, measuring the soil moisture content distribution condition by using soil drilling after the test is finished, digging a soil wetting section by opening a soil box side door (11) during drip irrigation of the line source, taking out and airing the soil through the soil box side door (11), and performing the next test.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| US5341831A (en) * | 1991-05-02 | 1994-08-30 | Technion Research And Development Foundation Ltd. | Method and apparatus for irrigation control |
| CN206696116U (en) * | 2017-03-13 | 2017-12-01 | 四川农业大学 | A kind of soil infiltration experimental provision |
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| CN101256120A (en) * | 2008-04-03 | 2008-09-03 | 中国农业大学 | Simple apparatus for testing combination property of drip irrigation douche |
| CN203365275U (en) * | 2013-04-12 | 2013-12-25 | 新疆维吾尔自治区水利水电科技信息中心 | Point source infiltration wetting front testing device based on Markov bottle |
| CN104729845B (en) * | 2015-03-23 | 2017-06-06 | 大禹节水（天津）有限公司 | Drip irrigation below the surface device anti-blocking performance test device |
| CN105181304B (en) * | 2015-06-01 | 2017-08-08 | 中国农业科学院农田灌溉研究所 | A kind of foldable multi-functional drip irrigation pipe belt comprehensive test device and application thereof |
| CN104949826A (en) * | 2015-06-08 | 2015-09-30 | 东莞一翔液体肥料有限公司 | Device and method for rapidly measuring water pressure influence on flow rate of to-be-measured drippers |
| CN206281850U (en) * | 2016-12-23 | 2017-06-27 | 中国农业科学院烟草研究所 | Portable field soil wetting front drawing apparatus |
| CN206709891U (en) * | 2017-05-09 | 2017-12-05 | 内蒙古自治区水利科学研究院 | A kind of laboratory testing rig of underground drip irrigation system clogging against negative pressure |
| CN206906376U (en) * | 2017-06-02 | 2018-01-19 | 陕西地建土地工程技术研究院有限责任公司 | A kind of water infiltration determines device |
| CN108168626B (en) * | 2018-03-26 | 2024-03-15 | 中国水利水电科学研究院 | Device and method for rapidly measuring pressure and flow of underground water irrigator |
| CN208459383U (en) * | 2018-07-18 | 2019-02-01 | 中国农业科学院农田灌溉研究所 | A kind of device of measurement trickle irrigation soil wetting front extension |
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| US5341831A (en) * | 1991-05-02 | 1994-08-30 | Technion Research And Development Foundation Ltd. | Method and apparatus for irrigation control |
| CN206696116U (en) * | 2017-03-13 | 2017-12-01 | 四川农业大学 | A kind of soil infiltration experimental provision |
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