CN108677896B - Automatic control drain gate for field rain accumulation in paddy field - Google Patents
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- 238000009825 accumulation Methods 0.000 title claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 86
- 241000209094 Oryza Species 0.000 claims abstract description 46
- 235000007164 Oryza sativa Nutrition 0.000 claims abstract description 46
- 235000009566 rice Nutrition 0.000 claims abstract description 46
- 238000003860 storage Methods 0.000 claims abstract description 35
- 238000013461 design Methods 0.000 claims description 22
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- 230000001488 breeding effect Effects 0.000 claims 1
- 239000002184 metal Substances 0.000 claims 1
- 238000003973 irrigation Methods 0.000 description 17
- 230000002262 irrigation Effects 0.000 description 17
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
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- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 3
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- 238000004519 manufacturing process Methods 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- 239000011574 phosphorus Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 210000003746 feather Anatomy 0.000 description 2
- 239000003621 irrigation water Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- 238000006073 displacement reaction Methods 0.000 description 1
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- 230000002349 favourable effect Effects 0.000 description 1
- 230000004720 fertilization Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 230000035699 permeability Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
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Abstract
The automatic control drain gate for rain accumulation in paddy field includes gate slot and N overflow gate boards with drain holes and plugs in different specifications, the gate slot is installed on the ridge between the paddy field and the drain ditch or in front of the drain pipe in the field, the upper part of the gate bottom slot is level with the surface of the paddy field, and the top of the gate slot is level with or slightly higher than the ridge; the vertical distance between the plane of the lower edge of the overflow gate plate drain hole and the upper part of the gate bottom groove is equal to the water storage upper limit depth of the rice in the growing period, and the vertical distance between the plane of the top of the overflow gate plate and the plane of the upper part of the gate bottom groove is equal to the temporary water storage upper limit depth of the rice in the growing period; the height of the overflow thin-wall weir and the width of the overflow thin-wall weir are determined by calculating the designed drainage standard, the temporary water storage upper limit and the rice field area; the number, the aperture and the position of the water discharge holes on the overflow flashboard are calculated and determined according to the rice field area, the temporary upper limit of water storage and the upper limit of water storage in a certain growth period and the allowable time for retaining the water. The invention can realize the automatic control of the rain-accumulating and water-draining index in the rice field.
Description
Technical Field
The invention relates to a field drainage building, in particular to an automatic control drainage gate for field rain accumulation in a paddy field, and belongs to the field of irrigation and drainage in farmland water conservancy.
Background
The rice in the growth period of paddy rice in China has more storm, the drainage amount of the paddy field is large, and the paddy field under high fertilization amount is easy to cause a large amount of nitrogen and phosphorus to be lost along with drainage, so that the water body environment is deteriorated. In recent years, the research and application project of the technology of controlling the irrigation by storing rain and controlling the irrigation and discharging by the cooperation of the irrigation and the discharge of paddy fields is developed in universities of river and sea, universities of martial arts and the like, and the technology of controlling the irrigation and discharging by the cooperation of the irrigation and the discharge of paddy fields is proposed, namely, the depth of storing water after rain is improved while the lower limit of the irrigation water is kept, so that the drought resistance and flooding resistance of paddy fields are fully utilized, the rainfall utilization efficiency is improved, meanwhile, the drainage interception is carried out by utilizing farmlands and ditches, the wetland effect of the ditches and farmlands is utilized, the drainage amount and the nitrogen and phosphorus concentration are reduced, the pollutant load is reduced, the achievement is promoted and applied in large areas in paddy fields in China, and the application results of various fields show that: the irrigation quota is reduced by 20-55% compared with the conventional flooding irrigation, the drainage quota is reduced by 25-70%, the rainfall utilization efficiency is increased by 30-50%, the irrigation water production efficiency is increased by 45-85%, the nitrogen and phosphorus load of a farmland in unit area is reduced by 70%, and the effects of good water saving, pollution reduction, pollution prevention, high quality and high efficiency are achieved.
However, the technology of controlling irrigation by rain accumulation of paddy rice and cooperative irrigation of paddy rice ditch fields are used as an advanced water-saving and emission-reducing technology promoted in the current southern sixteen-province paddy rice planting area in China, and in the popularization and application process, the existing paddy field drainage gate is generally formed by adopting DN 100-DN 300 concrete prefabricated pipes, PVC pipes or directly digging furrow field stems to drain to waist ditches and hair ditches, no automatic control paddy field drainage facility is currently available in China, and a water drainage operator or farmer decides to open or block a drainage port according to the paddy field drainage experience during rainfall, so that the popularization area cannot strictly realize accurate drainage control according to the water accumulation and irrigation drainage system, and the water management of water saving, emission reduction and high yield of paddy rice is not facilitated; and when thunderstorm is carried out for a long time, a water operator or a farmer can drain the water by taking the thunderstorm out in the field, so that the water drainage workload is high and the operation danger is high.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides the automatic control drainage gate for the rain accumulation in the rice field, which can realize the automatic control of the rain accumulation and drainage indexes in the rice field and can fill the blank of an automatic control drainage building in the field.
The technical scheme adopted for solving the technical problems is as follows: the overflow gate comprises a gate slot and N overflow gate plates with drain holes and hole plugs in different specifications, wherein the gate slot is arranged on a ridge between a paddy field and a drain ditch or in front of a drain pipe in the field, the plane of the upper part of a gate bottom slot is level with the field surface of the paddy field, and the plane of the top of the gate is level with or slightly higher than the ridge; the overflow flashboard is arranged in the gate groove, wherein the vertical distance between the plane of the lower edge of the upper drain hole of the overflow flashboard and the plane of the upper part of the gate bottom groove is equal to the water storage upper limit depth of the rice in the growing period, and the vertical distance between the plane of the top of the overflow flashboard and the plane of the upper part of the gate bottom groove is equal to the temporary water storage upper limit depth of the growing period; the vertical distance from the plane of the top of the gate slot to the plane of the top of the overflow gate is the height of the overflow thin-wall weir, B is the width of the overflow thin-wall weir, and the height and the width of the overflow thin-wall weir are determined by calculating the design drainage standard, the temporary upper limit of water storage and the area of the rice field; the number, the aperture and the position of the water discharge holes on the overflow flashboard are calculated and determined according to the paddy field area and the temporary upper limit and the upper limit of water storage in the growing period and the allowable time delay.
Compared with the prior art, the automatic control drainage gate for the field rain in the paddy field comprises a gate slot and N overflow gate plates with drainage holes and hole plugs in different specifications, and the size, the relative position relation and the number, the aperture and the positions of the drainage holes on the gate slot and the overflow gate plates are determined according to the calculation of the paddy field area and the temporary upper water storage limit and the upper water storage limit of different growth periods, so that the following purposes are realized:
(1) When the rainstorm which is more than or equal to the design drainage standard occurs, the water quantity which is higher than the upper limit of the temporary rain accumulation is rapidly discharged through the upper part of the overflow flashboard in the rainfall period;
(2) In the time of allowing the water to be accumulated (24 hours after rain), the water between the upper limit of temporary rain accumulation and the upper limit of water accumulation is discharged through a water discharge hole on the overflow flashboard;
(3) And when the allowable storage time is over (24 hours after rain), controlling the rice field water storage level at the upper limit position of the water storage.
The invention does not need manual field operation in a heavy rain period, can realize automatic control of drainage of the paddy field according to the design drainage index, can reduce the irrigation and drainage times and irrigation and drainage amount of the paddy field, improves the rainwater utilization efficiency and the water production efficiency, and achieves the aims of saving water, reducing pollution, being efficient and saving labor. The invention has the advantages of simple structure, convenient manufacture, low cost, no power and no manual duty, is suitable for field application in vast rice planting areas, and has wide popularization and application prospects.
Drawings
The invention will be further described with reference to the drawings and examples.
Fig. 1 is a schematic diagram of the structure of an embodiment of the present invention.
Fig. 2 is a block diagram of the plug of fig. 1.
In the figure, 1, gate slot, 2, overflow gate, 3, gate handle, 4, drain hole, 5, ridge, 6, hole plug, 7 and connecting rope.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. 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 fall within the scope of the invention.
In the embodiment shown in fig. 1 and 2, the overflow gate plate 2 with drain holes 4 and plugs 6 in different specifications comprises a gate groove 1, wherein the gate groove 1 is arranged on a ridge 5 between a paddy field and a drain ditch or at the front part of the drain pipe in the field, a gate bottom groove (the gate bottom groove refers to a part of the gate groove 1 buried under the field surface, the upper part of the gate bottom groove is the bottom of the gate with clear height, the plane (i.e. the plane at A in the drawing) where the gate is inserted into the gate bottom groove) is flush with the field surface of the paddy field, and the plane at the top of the gate groove 1 (i.e. the plane at D in the drawing) is flush with the ridge 5 or slightly higher than the ridge 5; the overflow gate plate 2 is arranged in the gate slot 1, wherein the vertical distance between the plane of the lower edge of the drain hole 4 on the overflow gate plate 2 (i.e. the plane of the position B1 in the figure) and the plane of the upper part of the bottom slot (the field surface) is equal to the water storage upper limit depth H of a certain growth period of rice 2 The vertical distance between the top plane of the overflow gate plate 2 (i.e. the plane of C in the figure) and the upper plane of the gate bottom groove (the field plane) (i.e. the plane of A in the figure) is equal to the temporary water storage upper limit depth H of the growing period 1 The method comprises the steps of carrying out a first treatment on the surface of the The vertical distance from the plane of the top of the gate slot 1 (i.e. the plane of the D position in the figure) to the plane of the top of the overflow gate 2 (i.e. the plane of the C position in the figure) is the height of the overflow thin-wall weir, B is the width of the overflow thin-wall weir, and the height and the width of the overflow thin-wall weir are determined by the design drainage standard, the temporary upper limit of water storage and the calculation of the rice field area; the number, the aperture and the position of the water discharge holes 4 on the overflow flashboard 2 are calculated and determined according to the rice field area and the temporary upper limit and the upper limit of water storage in a certain growth period and the allowable time delay.
As a further development, one end of the plug 6 is provided with a connecting rope 7 connected to the ram handle 3. A gate handle 3 can also be arranged at the top of the overflow gate 2 so as to replace the overflow gate 2 during different growth periods of rice.
In this embodiment, the hole plug 6 may be made of rubber, wood, PVC, or concrete. The shape of the drain hole 4 on the overflow gate 2 can be a polygon such as a circle, a rectangle, a square or a triangle. The gate slot 1 and the overflow gate plate 2 are identical in shape and are rectangular, trapezoidal or triangular. The overflow flashboard 2 and the gate slot 1 are made of PVC, steel, wood or concrete materials and the like.
The invention is mainly invented for promoting the popularization and application of the rice rain-accumulating control irrigation and ditch field cooperative control irrigation and drainage technology, and the main control indexes are as follows:
table 1 field moisture control index for Rice ditch-field cooperative irrigation and drainage control technique
In the popularization and application of the rice ditch-field cooperative control irrigation and drainage technology, in order to strictly realize the water storage and drainage control indexes of rice in each growth period, the problems that the drainage gate is in existence but cannot automatically control the drainage indexes or the field control-free drainage gate optionally excavates the ridge 5 for drainage in the present situation are solved, and the accurate automatic control of field drainage is realized according to the rainfall water storage design indexes. Other paddy rice, paddy fields, dry fields, impounding reservoirs, pond and dam drainage systems and the like can refer to the design concept of the invention.
Technical principle:
(1) Design of drainage criteria
The automatic control drainage gate for the field rain accumulation of the paddy field disclosed by the invention is used for controlling the drainage gate according to the high-standard design standard of field drainage: and the waste water is discharged 1 day after 200mm of daily rain.
(2) Design of aperture of water drain hole 4 on overflow flashboard 2
The average rainfall intensity method is adopted in this example to calculate the water level and water storage capacity and drainage of paddy field.
The rice field is generally a grid field or a furrow field, and the area F (m 2 )；
The upper drain hole 4 of the overflow flashboard 2 needs to drain the temporary upper limit H of water storage in a certain growth period of rice 24 hours after rain 1 Upper limit of water storage H 2 Depth of water H between 0 ，H 0 ＝H 1 -H 2 (m)；
The common need of dischargingTime-lapse water storage capacity of w=f×h 0 ＝F*(H 1 -H 2 )(m 3 )；
The number of the drainage holes 4 of the overflow flashboard 2 can be one or N, the height of the lower edge of the lowest drainage hole 4 is equal to the upper limit of rice water storage, and one drainage hole 4 is adopted for design in the embodiment;
the height difference between the drain hole 4 and the field surface is H 2 Is higher than the water level of the downstream drainage ditch, is free outflow, and has a flow formula of
Q t For orifice flow (m 3 /s)；
A is the aperture area a=pi D 2 /4(m 2 ) D is the orifice diameter (m);
H t the water head (m) of the orifice at a certain point in time,
g is gravity acceleration;
μ is the orifice flow coefficient; for a thin-walled circular small orifice,ε＝0.63～0.64，/>μ＝0.60～0.62；
t is drain duration, t=1 to 24 (h), other symbols are the same as before;
Q t an average flow rate of the shutter water drain hole 4 at a certain time period, (m) 3/ s)；
Ht is the height difference between the field water level and the center point of the flashboard drainage hole 4 in a certain period of time, (m);
from the above formula, it can be assumed that the aperture of the shutter drain hole 4 is D, and H in a certain period is calculated by an Excel table in time periods t And Qt, the sum of the flows equals the design drainage by accumulating 24 hoursThe quantity W is calculated in a trial way to obtain the aperture D value of the flashboard drain hole 4, and the aperture D of the drain hole 4 is determined; or by field drainage test observations.
The rice field area is as follows: 20 x 50m 2 ＝500m 2 The temporary water storage upper limit of the returning period is 100mm, the water storage upper limit after rain is 70mm, and the water quantity which is required to be discharged through the water discharge hole 4 is W=500m 2 *(100mm-70mm)/1000＝15m 3 The drainage time was 24 hours after rain. The pore diameter was determined to be 29mm by trial calculation in the following table.
Table 2 drain hole aperture D and design displacement trial meter on overflow gate
The aperture of the drain hole 4 under the drain indexes of different rice field areas and different growth periods can be calculated by the method, and the following table is shown below:
table 3 table of paddy field block area and gate drainage aperture relation
Note that: for example, the rice field area is 1000m 2 The reversion period is 5 x 25, wherein 5 represents 5 drain holes 4 and 25 represents a hole diameter of 25mm.
As can be seen from the above table, when the rice field area is less than 500m 2 1 water drain hole 4; when the rice field area is more than 500m 2 The aperture of one drainage hole 4 may be larger than the distance between the temporary upper limit of water storage and the upper limit of water storage after rain, and a plurality of drainage holes 4 need to be arranged, for example, the area of a paddy field is 2000m 2 The overflow flashboard 2 in the returning green stage can be adjusted to 4 pieces of 500m 2 4 phi 29mm holes are formed in the field, or 5 holes are formed according to 400m 2 The field is provided with 5 phi 25mm holes or 8 holes of 200m 2 8 phi 18mm holes are formed in the field.
TABLE 4 clear height L of overflow gate and drain hole position
| Overflow gate plate reference numeral | 1# flashboard | 2# flashboard | 3# flashboard | 4# flashboard |
| Clear height H (mm) of overflow gate | 100 | 150 | 150 | 200 |
| Height H of lower edge of drain hole from field surface 2 (mm) | 70 | 80 | 100 | 150 |
(3) Design of gate width B
The invention is designed in such a way that when the runoff depth of the storm water is larger than the upper limit of temporary rain accumulation, water can freely flow out and drain into the rough groove or the waist groove through the rectangular thin-wall weir formed by the upper part of the overflow flashboard 2 and the gate slot 1 in the rainfall period.
1) Design the radial depth and drainage of the storm rain larger than the upper limit of temporary rain accumulation
Radial flow depth: r is R Rice ＝P-S-E Rice
Wherein: p—design rainfall, p=200mm;
s-temporary water storage depth of paddy fields, wherein the upper limit of temporary rain storage in the growing period-the depth of a water layer before rain is taken to be mm; taking mid-tillering as an example, the upper limit of temporary rain accumulation is 150mm, and the depth of a water layer before rain is 10mm, and s=140 mm;
e-paddy field water consumption intensity (mm/d);
paddy field water consumption intensity E Rice Can be determined according to test data or the permeability coefficient (mm/d) of soil, and the rice field water yield R can be calculated according to the parameters Rice 。
Designing overflow drainage volume: w=r Rice *F/1000
Wherein: w-total overflow drainage, (m) 3 )；
F-area of rice field, (m) 2 )。
2) Overflow drain time of overflow gate 2
In order to reduce drainage and improve the effective rainfall utilization rate of the paddy field, the drainage hole 4 of the overflow flashboard 2 before rain is in a closed state of the hole plug 6, if the design heavy rain occurs, the flashboard drainage hole 4 is opened to drain water after the rain, and when the design heavy rain occurs, the overflow starting time of the overflow flashboard 2 is calculated according to the average rainfall intensity and the water consumption intensity of the paddy field.
Overflow start time T of overflow gate 2 1 ＝24S/(P-E Rice ),(h)；
Overflow drainage total time T 2 ＝24—T 1 ，(h)。
3) Overflow drain flow rate
When the design storm water produces the water level that the runoff degree of depth is greater than interim rain upper limit that holds, the drainage is discharged into the feather ditch, the waist ditch through overflow flashboard 2 top and the rectangular thin wall weir free outflow that gate slot 1 constitutes, is applicable to there is side shrink rectangular thin wall weir free flow formula, and the formula is:
wherein: h is a weir crest head, (m);
b is the width of the weir crest, namely the clear width of the gate, (m);
m 0 for the flow coefficient, it can be determined by the equation for the island Gu Yishou:
B 0 is the width of the field surface, (m);
p is the height difference between the field surface and the top of the flashboard, and (m).
4) The rice field area is 20 x 50m 2 The following are examples:
designing storm as daily rain of 200mm, and assuming that the depth of a water layer of a paddy field before rain is 10mm, wherein E is the water consumption intensity of the paddy field of 4mm/d; the upper limit of temporary rain accumulation in the green-turning period with the largest drainage quantity is 100mm;
radial flow depth: r is R Rice ＝P-S-E Rice ＝200-100-4＝96mm
Designing overflow drainage total amount: w=r Rice *F/1000＝96m 3 ；
(1) Overflow drain time of overflow gate 2
Overflow start time T of overflow gate 2 1 ＝24S/(P-E Rice )＝24*100/(200-4)＝12.24(h)；
Overflow drainage total time t2=24-T 1 ＝11.76(h)。
(2) Overflow drain flow rate
The drainage flow rate Q was calculated in accordance with the less favorable conditions in which the runoff produced by rainfall was concentrated to be discharged within 1 hour: q=p 1 *A/3600＝96*1000/1000/3600＝0.02667m 3 /s；
When the design storm water produces the water level that the runoff degree of depth is greater than interim rain upper limit that holds, the drainage is discharged into waist ditch, feather ditch through overflow flashboard 2 top and the rectangular thin wall weir free outflow that gate slot 1 constitutes, in the drainage period, is applicable to there is side shrink rectangular thin wall weir free flow formula, and the average flow formula is:
wherein: h is a water head of a weir crest, and the net height of the ridge 5 is generally 0.30m, and the net height of the flashboard in the green returning period is 0.10 (m), so that the maximum allowable water head on the flashboard is 0.20m for avoiding the overflow of the water level of the paddy field from the ridge 5;
b is the width of the weir crest, namely the clear width of the gate, (m);
m 0 for the flow coefficient, the method can calculate by referring to the one-hand island formula of the grain-keeping, and take the approximate value of m 0 ＝0.41；
Clear width of gate in green-returning period
The design drainage amount in other growth periods is smaller than that in the turning green period, so that the net width of the field water outlet gate is determined by the turning green period, and is 500m 2 The net width of the overflow drainage gate is 0.15m below the field, so that the drainage requirement can be met; the clear width of the overflow drain gates for other paddy fields is shown in Table 5.
TABLE 5 relation between areas of different paddy fields and gate clearance B
The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the invention in any way, but any simple modification and equivalent variation of the above embodiment according to the technical spirit of the present invention falls within the scope of the present invention.
Claims (10)
1. An automatic control drainage door for field rain accumulation in paddy fields is characterized in that: the overflow gate plate (2) with drain holes (4) and hole plugs (6) in N different specifications comprises a gate groove (1), wherein the gate groove (1) is arranged on a ridge (5) between a paddy field and a drain ditch or at the front part of a drain pipe in the field, the plane of the upper part of a gate bottom groove is level with the field surface of the paddy field, and the plane of the top of the gate groove (1) is level with the ridge (5) or slightly higher than the ridge (5); the overflow flashboard (2) is arranged in the gate groove (1), wherein the vertical distance between the plane of the lower edge of the drain hole (4) of the overflow flashboard (2) and the plane of the upper part of the gate bottom groove is equal to the water storage upper limit depth of the rice in the growing period, and the vertical distance between the plane of the top of the overflow flashboard (2) and the plane of the upper part of the gate bottom groove is equal to the temporary water storage upper limit depth of the growing period; the vertical distance from the top of the gate slot (1) to the top of the overflow gate (2) is the height of the overflow thin-wall weir, B is the width of the overflow thin-wall weir, and the height and the width of the overflow thin-wall weir are determined by calculating the design drainage standard, the temporary water storage upper limit and the rice field area; the number, the aperture and the position of the water discharge holes (4) on the overflow flashboard (2) are calculated and determined according to the paddy field area and the temporary upper limit and the upper limit of water storage in the growing period and the allowable time delay.
2. The automatic control drain door for paddy field rain accumulation according to claim 1, wherein: the number of the drainage holes (4) on the overflow flashboard (2) is one or N; when the rice field area is less than 500m 2 1 water draining hole (4) on overflow gate plate (2) is measured, when rice field area is larger than 500m 2 Preferably, a plurality of drainage holes (4) are arranged, and the specific number value refers to table 3:
table 3 table of paddy field block area and number of gate drainage holes and aperture arrangement
。
3. The automatic control drain door for paddy field rain accumulation according to claim 2, wherein: clear height H of overflow flashboard (2) adopted in different growth periods of rice 1 Value and height H of the plane of the lower edge of the drain hole (4) from the field surface 2 Referring to table 4:
TABLE 4 clear height of flashboard and drainage hole position for rice different breeding
。
4. The automatic control drain door for paddy field rain accumulation according to claim 2, wherein: the clear width B of the overflow flashboard (2) is determined according to the designed drainage flow rate of the turning green period; 500m 2 The field blocks B are preferably uniformly taken to be 0.15m and 500m 2 The above field blocks are specifically valued with reference to table 5:
TABLE 5 relation between areas of different paddy fields and gate clearance B
5. An automatic control drainage gate for paddy field rain accumulation according to claim 1 or 2 or 3 or 4, characterized in that: and a flashboard handle (3) is also arranged at the top of the overflow flashboard (2).
6. An automatic control drainage gate for rain accumulation in paddy fields according to claim 1 or 2 or 3 or 4, characterized in that; one end part of the hole plug (6) is provided with a connecting rope (7) connected with the flashboard handle (3).
7. The automatic control drain door for paddy field rain accumulation according to claim 6, wherein: the hole plug (6) is made of rubber, wood, PVC, metal or concrete materials.
8. An automatic control drainage gate for paddy field rain accumulation according to claim 1 or 2 or 3 or 4, characterized in that: the shape of the upper drain hole (4) of the overflow flashboard (2) is round, rectangular, square or triangular.
9. An automatic control drainage gate for paddy field rain accumulation according to claim 1 or 2 or 3 or 4, characterized in that: the gate slot (1) and the overflow gate plate (2) are identical in shape and are rectangular, trapezoidal or triangular.
10. An automatic control drainage gate for paddy field rain accumulation according to claim 1 or 2 or 3 or 4, characterized in that: the overflow flashboard (2) and the gate groove (1) are made of PVC, steel, wood or concrete materials.
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| CN201810281475.0A CN108677896B (en) | 2018-04-02 | 2018-04-02 | Automatic control drain gate for field rain accumulation in paddy field |
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| CN201810281475.0A CN108677896B (en) | 2018-04-02 | 2018-04-02 | Automatic control drain gate for field rain accumulation in paddy field |
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| CN108677896B true CN108677896B (en) | 2023-12-19 |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR19990042888A (en) * | 1997-11-28 | 1999-06-15 | 구본준 | Manufacturing method of semiconductor device |
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