An irrigation structure and method for rice fields with water-saving function

Abstract

The application relates to an irrigation structure and method for rice fields with a water-saving function, and relates to an irrigation structure and method. In order to solve the problems of water resource waste and complicated operation in the process of current rice irrigation, the application has the advantages of simple structure, convenient operation, and the like. Before adjusting the water consumption of each field, the channel gate is closed, and the water supplement gate is automatically opened. The floating gate block rises and falls along with the rise and fall of the water level in the irrigation channel, so that the water distribution tank can dynamically supplement the water in the irrigation channel, and convenience is provided for the irrigation work. Meanwhile, the adjustment of the opening degree of the turnover valve is realized by the rotation of the rack driving gear, so that the water amount in the irrigation channel can be ensured to be sufficient, and overflow in the irrigation channel is avoided, and irrigation water is saved. The application belongs to the irrigation device and rice field irrigation technical field.

Description

TECHNICAL FIELD

[0001] The present application relates to an irrigation structure and an irrigation method, in particular to an irrigation structure and an irrigation method with water-saving function for rice field, belonging to the field of irrigation device and rice field irrigation technology. BACKGROUND

[0002] Intermittent irrigation is a kind of irrigation mode that maintains water layer in the field for a period of time, and then lets it dry naturally, irrigates shallow water layer again, and then dries again, which is helpful for rice root growth and improvement of root activity, has the advantages of fast irrigation speed and low methane emission, and is widely used in rice planting process. In order to ensure that the rice can obtain appropriate amount of water, the rice field is divided into several plots, and the irrigation channel is connected between the rice field and the water source. A water release gate is installed at the water inlet of each plot to realize irrigation of each plot.

[0003] During the irrigation process, due to the influence of factors such as topography, soil condition or rice variety, the irrigation water consumption of each plot is different. If the water quantity in the irrigation channel is insufficient, it will affect the efficiency and quality of irrigation. Therefore, the irrigation personnel need to ensure that the water quantity in the irrigation channel is sufficient, which requires the irrigation personnel to frequently open and close the water supply equipment (such as water pump or water pump) to supply water to the irrigation channel. There is a certain distance between the rice field and the water source. If the water supply equipment is not closed in time, the water in the irrigation channel will overflow.

[0004] In addition, the irrigation personnel also need to adjust the opening degree of each water release gate to ensure that each plot obtains the corresponding water distribution. However, when adjusting the opening degree of a water release gate, the water level in the irrigation channel will also be affected. For example, if the opening degree of a water release gate is reduced, the water level in the irrigation channel will rise and then overflow from the irrigation channel.

[0005] In summary, there is a phenomenon of water resource waste in the process of irrigating the rice field at present, and the operation is complicated during irrigation, which brings great inconvenience to the work of the irrigation personnel. Therefore, how to solve the above technical problems and propose an irrigation structure and an irrigation method with water-saving function has become a problem to be solved by the technical personnel in the field at present. SUMMARY

[0006] The present application provides an irrigation structure and an irrigation method with water-saving function for rice field.

[0007] The technical scheme of the present application is: an irrigation structure with water-saving function for rice field, comprising a water evaporation pool, an irrigation channel, a channel gate, a water supplement gate, a escapement unit, a water distribution tank and a connecting rod.

[0008] The irrigation channel is arranged between the water evaporation pool and the rice field, and the irrigation channel is communicated with the rice field.

[0009] The water distribution tank is arranged at the head of the irrigation channel, the water tank is supplied with water by the water pump, the water distribution tank comprises a turnover valve, a gear, a rack and an overflow pipe.

[0010] The bottom of the water distribution tank is provided with a drain valve port, the drain valve port is communicated with the irrigation channel, the turnover valve is arranged in the drain valve port and is rotationally connected with the water distribution tank, one end of the turnover valve is provided with the gear, the gear is engaged with the rack, the rack is arranged in parallel with the horizontal plane and is slidingly connected with the side wall of the water distribution tank, and the overflow pipe is fixedly connected with the side wall of the water distribution tank and is communicated with the water tank.

[0011] The channel gate and the water replenishing gate are arranged side by side in the irrigation channel, the water replenishing gate comprises a gate frame and a floating gate block, the gate frame is vertically fixedly connected with the irrigation channel, the floating gate block is slidingly connected with the gate frame, the floating gate block is provided with a limiting groove, and the two ends of the connecting rod are respectively hingedly connected with the floating gate block and the rack.

[0012] When the channel gate is opened, the opening degree of the turnover valve is maximum, the escapement unit locks the floating gate block, and the lower surface of the floating gate block abuts against the channel bottom of the irrigation channel.

[0013] When the channel gate is closed, the escapement unit is disengaged from the floating gate block, the floating gate block can slide along the height direction of the gate frame, when the water level in the irrigation channel reaches the upper limit of the irrigation channel, the turnover valve is just closed, and the opening degree of the turnover valve is adjusted by rotating the gear driven by the rack.

[0014] Further, the escapement unit comprises a cross beam, the cross beam is fixedly connected with a latch, a wedge-shaped block and two slide columns.

[0015] The slide columns are slidingly connected with the frame of the channel gate, the slide columns are provided with springs and nuts, and the nuts and the cross beam are arranged at the two side surfaces of the channel gate respectively, and the two end surfaces of the spring abut against the nut and the frame of the channel gate respectively.

[0016] The wedge-shaped block is arranged between the two slide columns, and the lower surface of the wedge-shaped block abuts against the channel bottom of the irrigation channel.

[0017] When the channel gate is opened, the latch is inserted into the limiting groove, and the lower surface of the floating gate block abuts against the channel bottom of the irrigation channel.

[0018] When the channel gate is closed, the gate plate of the channel gate abuts against the inclined surface of the wedge-shaped block, the wedge-shaped block can drive the cross beam to move away from the channel gate, the latch is extracted from the limiting groove, and the floating gate block can slide along the height direction of the gate frame.

[0019] Further, the cross section of the turnover valve is semicircular, the axial length of the turnover valve is the same as the length of the drain valve port, and the width of the drain valve port is the same as the diameter of the outer circumferential surface of the turnover valve.

[0020] The application further provides a rice field irrigation method with water saving function.

[0021] Step one, initial irrigation

[0022] Step one, in the process of initial irrigation, the water consumption of the rice field is large, so the water discharge gate at each field inlet is opened.

[0023] Step two, in the process of initial irrigation, the water consumption of the rice field is large, so the water discharge gate at each field inlet is opened.

[0024] Step three, in the process of initial irrigation, the water consumption of the rice field is large, so the water discharge gate at each field inlet is opened.

[0025] Step two, middle irrigation

[0026] Step two, in the process of initial irrigation, the water consumption of the rice field is large, so the water discharge gate at each field inlet is opened.

[0027] Step two, in the process of initial irrigation, the water consumption of the rice field is large, so the water discharge gate at each field inlet is opened.

[0028] Step three, late irrigation

[0029] After each field is irrigated, the irrigation personnel close the water pump and the water discharge gate 120 at each field inlet, and the irrigation is completed.

[0030] Compared with the prior art, the application has the following effects:

[0031] 1. The application has simple structure and convenient operation. Before adjusting the water consumption of each field, the irrigation personnel closes the channel gate 110 at the channel head, and the water replenishment gate 200 is automatically opened. The floating gate block 220 rises and falls with the rise and fall of the water level in the irrigation channel 100, so that the water distribution tank 400 can dynamically replenish water for the irrigation channel 100, providing convenience for irrigation work. At the same time, the adjustment of the opening degree of the reversing valve 410 is realized by driving the gear 420 to rotate through the rack 430, which can ensure that the water in the irrigation channel 100 is sufficient, and avoid overflow in the irrigation channel 100, saving irrigation water.

[0032] 2. The application transports the water in the water pond 130 to the water distribution tank 400 through the water pump, and then the water distribution tank 400 supplies water for the irrigation channel 100, which improves the temperature of the irrigation water, meets the physiological needs of water temperature of rice, speeds up the growth period of rice, and helps to increase the yield of rice. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1is an isometric view of the present application;

[0034] Figure 2 is an isometric view of the channel gate 110, the water pool 130, the water replenishing gate 200 and the water distribution tank 400 of the present application;

[0035] Figure 3 is Figure 2 is a partial enlarged view of the I part in the figure;

[0036] Figure 4 is an isometric view of the channel gate 110 and the escapement unit 300 of the present application;

[0037] Figure 5 is Figure 4 is a partial enlarged view of the II part in the figure;

[0038] Figure 6 is an isometric view of the water replenishing gate 200 of the present application;

[0039] Figure 7 is a structural schematic view of the connecting rod 440 of the present application;

[0040] Figure 8 is a schematic view of the water replenishing gate 200 of the present application when it is closed;

[0041] Figure 9 is a schematic view of the water replenishing gate 200 of the present application when it is opened.

[0042] in the figure:

[0043] 100, irrigation channel; 110, channel gate; 120, water releasing gate;

[0044] 130, water pool; 140, rice field;

[0045] 200, water replenishing gate; 210, gate frame; 220, floating gate block;

[0046] 221, first sliding rail; 222, first sliding block; 223, limiting recess;

[0047] 300, escapement unit; 310, crossbeam; 320, sliding column;

[0048] 321, spring; 322, nut; 330, wedge-shaped block;

[0049] 340, bolt;

[0050] 400, water distribution tank; 410, reversing valve; 420, gear;

[0051] 430, rack; 431, second sliding rail; 432, second sliding block;

[0052] 440, connecting rod; 441, inner threaded pipe; 442, articulated rod;

[0053] 450, overflow pipe; DETAILED DESCRIPTION

[0054] In order to make the invention purposes, features, advantages of the present application more obvious and easy to understand, the technical solutions of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application.

[0055] DETAILED DESCRIPTION Figures 1 to 9 The present embodiment is a water-saving irrigation structure for rice fields, which comprises a water evaporation pool 130, an irrigation channel 100, a channel gate 110, a water replenishment gate 200, an escapement unit 300, a water distribution tank 400 and a connecting rod 440.

[0056] The irrigation channel 100 is a spliced channel, which is arranged between the water evaporation pool 130 and a rice field 140, and is in communication with the rice field 140. The rice field 140 is divided into a plurality of field plots, and a water release gate 120 is installed at the water inlet of each field plot.

[0057] The water distribution tank 400 is arranged at the head of the irrigation channel 100, and the water evaporation pool 130 supplies water to the water distribution tank 400 through a water pump. The water distribution tank 400 comprises a turnover valve 410, a gear 420, a rack 430 and an overflow pipe 450.

[0058] The bottom of the water distribution tank 400 is provided with a drain valve port, which is in communication with the irrigation channel 100. The turnover valve 410 is arranged in the drain valve port and is rotationally connected to the water distribution tank 400. One end of the turnover valve 410 is provided with the gear 420, which is engaged with the rack 430. The rack 430 is arranged in parallel with the horizontal plane and is slidingly connected to the side wall of the water distribution tank 400. The overflow pipe 450 is fixedly connected to the side wall of the water distribution tank 400 and is in communication with the water evaporation pool 130.

[0059] The channel gate 110 and the water replenishment gate 200 are arranged side by side in the irrigation channel 100, and the width of the channel gate 110 and the water replenishment gate 200 is equal to the width of the irrigation channel 100. The water replenishment gate 200 comprises a gate frame 210 and a floating gate block 220. The floating gate block 220 is a hollow structure, which reduces the weight of the floating gate block 220 and increases the buoyancy thereof.

[0060] The gate frame 210 is fixedly connected with the irrigation channel 100 perpendicularly, the floating gate block 220 is slidably connected with the gate frame 210, the floating gate block 220 is provided with a limiting groove 223, and the two ends of the connecting rod 440 are hingedly connected with the floating gate block 220 and the rack 430 respectively. In this way, the floating gate block 220, the connecting rod 440 and the rack 430 form a double sliding block mechanism (the floating gate block 220 is one sliding block of the double sliding block mechanism, and the rack 430 is the other sliding block of the double sliding block mechanism). When the floating gate block 220 rises, the included angle between the connecting rod 440 and the horizontal plane becomes smaller, and at the same time, the connecting rod 440 drives the rack 430 to slide, and the rack 430 drives the gear 420 to rotate.

[0061] When the channel gate 110 is opened, the opening degree of the turnover valve 410 is the largest, the escapement unit 300 locks the floating gate block 220, and the lower surface of the floating gate block 220 abuts against the channel bottom of the irrigation channel 100.

[0062] When the channel gate 110 is closed, the escapement unit 300 is disengaged from the floating gate block 220, so that the floating gate block 220 can slide along the height direction of the gate frame 210. When the water level in the irrigation channel 100 reaches the upper limit of the irrigation channel 100, the turnover valve 410 is just closed, and the opening degree of the turnover valve 410 is adjusted by driving the gear 420 to rotate through the rack 430.

[0063] In the embodiment, the number of teeth of the gear 420 is N1, the number of teeth of the rack 430 is N2, and N1=4N2. In this way, when all the teeth of the rack 430 and the gear 420 complete one meshing, the turnover valve 410 rotates one fourth of a circle (that is, 90°).

[0064] Specific implementation method two: in combination with Figure 2 , Figure 4 and Figure 6 the embodiment is described. In the embodiment, the escapement unit 300 includes a cross beam 310, a latch 340, a wedge-shaped block 330 and two slide columns 320 fixedly connected with the cross beam 310.

[0065] The slide columns 320 are slidably connected with the frame of the channel gate 110, and the slide columns 320 are provided with springs 321 and nuts 322. The nuts 322 and the cross beam 310 are arranged on the two side surfaces of the channel gate 110 respectively, and the two end surfaces of the spring 321 abut against the nut 322 and the frame of the channel gate 110 respectively.

[0066] The wedge-shaped block 330 is arranged between the two slide columns 320, and the lower surface of the wedge-shaped block 330 abuts against the channel bottom of the irrigation channel 100.

[0067] When the channel gate 110 is opened, the latch 340 is inserted into the limiting groove 223, so that the lower surface of the floating gate block 220 abuts against the channel bottom of the irrigation channel 100.

[0068] When the channel gate 110 is closed, the gate plate of the channel gate 110 abuts against the inclined surface of the wedge-shaped block 330, the wedge-shaped block 330 can drive the cross beam 310 away from the channel gate 110 to realize the extraction of the bolt 340 from the limiting groove 223, so that the floating gate block 220 can slide along the height direction of the gate frame 210.

[0069] Further, the cross section of the wedge-shaped block 330 is a right trapezoid or a right triangle.

[0070] The other components and connection manners are the same as those in the first embodiment.

[0071] The third embodiment is described below. Figure 2 、 Figure 3 、 Figure 8 and Figure 9 The cross section of the turnover valve 410 is semicircular, and the center of the semicircle is the rotation center of the turnover valve 410.

[0072] When the opening of the turnover valve 410 is the largest, the straight edge of the semicircle is perpendicular to the bottom of the distribution tank 400, and the straight edge faces the overflow pipe 450. At this time, the rack 430 has not been engaged with the gear 420, so the turnover valve 410 remains stationary and does not rotate.

[0073] To make the opening adjustment process of the turnover valve 410 more obvious and easy to understand, the stroke of the rack 430 away from the floating gate block 220 is the feeding stroke, and the stroke of the rack 430 close to the floating gate block 220 is the return stroke (as shown in Figure 8 and Figure 9 When the water level in the irrigation channel 100 rises, the floating gate block 220 also gradually rises with the water level, the rack 430 starts to feed, and then the rack 430 is engaged with the gear 420, and the opening of the turnover valve 410 gradually becomes smaller. Since N1 (the number of teeth of the gear 420) = 4N2 (the number of teeth of the rack 430), when the last tooth of the rack 430 exits the engagement, the turnover valve 410 has just rotated one quarter (i.e. 90°), and the turnover valve 410 is closed (i.e. the straight edge of the semicircle is parallel to the bottom of the distribution tank 400). At this time, the water level in the irrigation channel 100 reaches the upper limit of the irrigation channel 100, so that the distribution tank 400 stops supplying water to the irrigation channel 100.

[0074] Conversely, when the water level in the irrigation channel 100 decreases, the floating gate block 220 also gradually decreases with the water level, the rack 430 is in the return stroke, and the opening of the turnover valve 410 gradually becomes larger. The rise or fall of the water level realizes that the distribution tank 400 can dynamically supplement water to the irrigation channel 100, and avoids the overflow of water in the irrigation channel 100.

[0075] Further, the axial length of the flip valve 410 is the same as the length of the drain valve port, and the width of the drain valve port is the same as the diameter of the outer circumferential surface of the flip valve 410.

[0076] Further, the overflow speed of the overflow pipe 450 is greater than the water supply speed of the distribution tank 400 to the irrigation channel 100.

[0077] Further, the flip valve 410 is hollow, which reduces the weight of the flip valve 410.

[0078] The other components and connection methods are the same as those in the first or second embodiment.

[0079] The fourth embodiment is described in combination with Figure 2 , Figure 3 and Figure 6 This embodiment includes a first sliding rail 221 mounted on the gate frame 210 and a first sliding block 222 mounted on the floating gate block 220, and the first sliding block 222 is in sliding connection with the first sliding rail 221.

[0080] Further, it also includes a second sliding rail 431 mounted on the side wall of the distribution tank 400 and a second sliding block 432 mounted on the rack 430, and the second sliding block 432 is in sliding connection with the second sliding rail 431.

[0081] The other components and connection methods are the same as those in the first, second, or third embodiment.

[0082] The fifth embodiment is described in combination with Figure 2 , Figure 3 , Figure 6 , Figure 7 , Figure 8 and Figure 9 This embodiment includes a length-adjustable connecting rod 440, which includes an internally threaded pipe 441 and two articulated rods 442.

[0083] The two articulated rods 442 are respectively articulated with the floating gate block 220 and the rack 430, and one of the articulated rods 442 is provided with left-handed threads, and the other is provided with right-handed threads.

[0084] The internally threaded pipe 441 has two segments of threads with opposite directions, and the two articulated rods 442 are screwed on the internally threaded pipe 441.

[0085] In this way, when the internally threaded pipe 441 is screwed clockwise or counterclockwise, the length of the screwing of the threads changes, thereby adjusting the length of the connecting rod 440, which facilitates the on-site installation of the distribution tank 400.

[0086] Other components and connection modes are the same as those in Embodiments I, II, III or IV.

[0087] Embodiment VI: Combination Figures 1 to 9 To illustrate the embodiment, the irrigation method for rice field with water-saving function is performed according to the following steps:

[0088] Step I: Initial irrigation stage

[0089] Step I: During the initial irrigation stage, the water consumption of the rice field 140 is large, so the water release gate 120 at each field inlet is opened;

[0090] Step II: The channel gate 110 is opened, and the pin 340 is inserted into the limiting groove 223 of the floating gate block 220;

[0091] Step III: The water pump is started to transport water in the water pond 130 to the distribution tank 400, which supplies water to the irrigation channel 100 through the water outlet valve, thereby realizing the transportation of irrigation water to each field;

[0092] Step II: Mid-irrigation stage

[0093] Step II: The irrigation personnel close the channel gate 110 at the channel head, and when the channel gate 110 is closed, the water supplement gate 200 is opened, and the irrigation channel 100 continues to supply water to each field;

[0094] Step II: The irrigation personnel go to the rice field 140 and adjust each water release gate 120 according to the water consumption of each field to realize the corresponding water consumption of each field;

[0095] During this process, if the opening degree of a water release gate 120 decreases, the water level in the irrigation channel 100 will rise, and the floating gate block 220 will also rise with the water level, the included angle between the connecting rod 440 and the horizontal plane will decrease, and then the rack 430 drives the gear 420 to rotate to reduce the opening degree of the reversing valve 410, thereby reducing the water supply of the distribution tank 400 to the irrigation channel 100. If the water level in the irrigation channel 100 reaches the upper limit of the irrigation channel 100, the reversing valve 410 is closed, so that the distribution tank 400 stops supplying water to the irrigation channel 100; on the contrary, when the opening degree of a water release gate 120 increases, the water level in the irrigation channel 100 decreases, the opening degree of the reversing valve 410 increases, the water supply of the distribution tank 400 to the irrigation channel 100 increases, thereby realizing the dynamic water supplement of the distribution tank 400 to the irrigation channel 100, and avoiding the overflow of water in the irrigation channel 100.

[0096] Step III: Late irrigation stage

[0097] After each field is irrigated, the irrigation personnel close the water pump and the water release gate 120 at each field inlet, and the irrigation is completed.

[0098] In this process, as the water in the irrigation channel 100 cannot continue to drain, the water level in the irrigation channel 100 continues to rise, when the water level in the irrigation channel 100 reaches the upper limit of the irrigation channel 100, the reversing valve 410 is just closed, so that the water distribution tank 400 stops supplying water to the irrigation channel 100, thereby avoiding the water in the irrigation channel 100 from overflowing from the channel, and the water in the irrigation channel 100 can be temporarily stored in the channel, and when irrigation is performed next time, the water drain gate 120 is opened to drain the water to the field; on the other hand, when the water level in the water distribution tank 400 rises to the height of the overflow pipe 450, the water overflows to the water drying pool 130, further saving irrigation water.

[0099] Working principle

[0100] The irrigation channel 100 is arranged between the water drying pool 130 and the rice field 140, the irrigation channel 100 is communicated with the rice field 140, the channel gate 110 and the water replenishing gate 200 are arranged side by side in the irrigation channel 100, and the width of the channel gate 110 and the water replenishing gate 200 is equal to the width of the irrigation channel 100, the channel gate 110 and the water replenishing gate 200 cannot be opened or closed at the same time, and the specific implementation principle is as follows:

[0101] When the channel gate 110 is opened, the gate plate of the channel gate 110 cannot be in contact with the inclined surface of the wedge-shaped block 330, so the cross beam 310 is in abutment with the frame of the channel gate 110 under the spring force of the spring 321, in this process, the opening degree of the reversing valve 410 is maximum, and the pin 340 is inserted into the limiting groove 223, so that the lower surface of the floating gate block 220 is in abutment with the channel bottom of the irrigation channel 100, that is, when the channel gate 110 is opened, the water replenishing gate 200 remains closed.

[0102] When the channel gate 110 is closed, the gate plate of the channel gate 110 is in abutment with the inclined surface of the wedge-shaped block 330, the spring 321 is compressed, the wedge-shaped block 330 drives the cross beam 310 away from the channel gate 110, and also drives the pin 340 out of the limiting groove 223, so that the floating gate block 220 can slide along the height direction of the gate frame 210, thereby realizing the opening of the water replenishing gate 200.

[0103] The water distribution tank 400 is arranged at the channel head of the irrigation channel 100, the water drying pool 130 supplies water to the water distribution tank 400 through the water pump, the tank bottom of the water distribution tank 400 is provided with a drain valve port, and the drain valve port is communicated with the irrigation channel 100.

[0104] The floating gate block 220 is in sliding connection with the gate frame 210, the two ends of the connecting rod 440 are respectively hinged with the floating gate block 220 and the rack 430, the rack 430 is in sliding connection with the water distribution tank 400, the rack 430 is in engagement with the gear 420, the gear 420 is installed at one end of the turnover valve 410, and the turnover valve 410 is in rotary connection with the water distribution tank 400, therefore, the floating gate block 220, the connecting rod 440 and the rack 430 form a double sliding block mechanism, the adjustment of the opening of the turnover valve 410 is realized by driving the gear 420 to rotate through the rack 430, when the water level in the irrigation channel 100 reaches the upper limit of the irrigation channel 100, the turnover valve 410 is just closed, thereby realizing that the water distribution tank 400 can dynamically supplement water to the irrigation channel 100, and avoiding the water in the irrigation channel 100 from overflowing from the channel, saving irrigation water.

[0105] The present application has been disclosed in the above-mentioned preferred embodiments, however, it is not intended to limit the present application, any person skilled in the art, without departing from the technical solution of the present application, according to the technical essence of the present application, any simple modification, equivalent change and modification of the above-mentioned embodiments, still belongs to the technical solution range of the present application.

Claims

1. A water-saving irrigation structure for paddy fields, comprising a water-drying pond (130) and an irrigation channel (100), wherein the irrigation channel (100) is arranged between the water-drying pond (130) and the paddy field (140), and the irrigation channel (100) is connected to the paddy field (140); Its features are, It also includes a channel gate (110), a water supply gate (200), an escapement unit (300), a water distribution tank (400), and a connecting rod (440). The water distribution tank (400) is located at the head of the irrigation canal (100). The water-drying pool (130) supplies water to the water distribution tank (400) through a water pump. The water distribution tank (400) includes a flip valve (410), a gear (420), a rack (430), a second slide rail (431), a second slider (432), and an overflow pipe (450). The bottom of the water distribution tank (400) has a drain valve port, which is connected to the irrigation channel (100). The flip valve (410) is arranged inside the drain valve port and is rotatably connected to the water distribution tank (400). The cross-section of the flip valve (410) is semi-circular. The axial length of the flip valve (410) is the same as the length of the drain valve port, and the width of the drain valve port is the same as the diameter of the outer circumference of the flip valve (410). A gear (420) is installed at one end of the tilt valve (410). The gear (420) meshes with a rack (430). The number of teeth on the gear (420) is... N 1. The number of teeth on the rack (430) is N 2; and N 1=4 N 2; The rack (430) is arranged parallel to the horizontal plane and is slidably connected to the side wall of the water distribution tank (400); the overflow pipe (450) is fixed to the side wall of the water distribution tank (400) and is connected to the sun-drying pool (130). The second slide rail (431) is installed on the side wall of the water distribution tank (400), and the second slider (432) is installed on the rack (430). The second slider (432) is slidably connected to the second slide rail (431). The channel gate (110) and the water supply gate (200) are arranged side by side in the irrigation channel (100). The water supply gate (200) includes a first slide rail (221), a first slider (222), a gate frame (210), and a floating gate block (220). The gate frame (210) is vertically fixed to the irrigation channel (100), the floating gate block (220) is slidably connected to the gate frame (210), the floating gate block (220) has a limit groove (223) on it, and the connecting rod (440) is an adjustable length connecting rod. The two ends of the connecting rod (440) are respectively hinged to the floating gate block (220) and the rack (430); The first slide rail (221) is installed on the gate frame (210), the first slider (222) is installed on the floating gate block (220), and the first slider (222) is slidably connected to the first slide rail (221); The escapement unit (300) includes a crossbeam (310), on which a pin (340), a wedge block (330) and two sliding pins (320) are fixedly connected. The sliding column (320) is slidably connected to the frame of the channel gate (110). A spring (321) and a nut (322) are installed on the sliding column (320). The nut (322) and the crossbeam (310) are respectively arranged on the two sides of the channel gate (110). The two ends of the spring (321) abut against the nut (322) and the frame of the channel gate (110) respectively. The wedge block (330) is arranged between two sliding columns (320), and the lower surface of the wedge block (330) abuts against the bottom of the irrigation channel (100). The cross-section of the wedge block (330) is a right trapezoid or a right triangle. When the channel gate (110) is opened, the opening of the flip valve (410) is at its maximum, the escapement unit (300) locks the floating gate block (220), and the pin (340) is inserted into the limiting groove (223) so that the lower surface of the floating gate block (220) abuts against the bottom of the irrigation channel (100); When the channel gate (110) is closed, the gate plate of the channel gate (110) abuts against the inclined surface of the wedge block (330). The wedge block (330) can drive the crossbeam (310) away from the channel gate (110) so that the pin (340) can be pulled out from the limiting groove (223). The escapement unit (300) is disengaged from the floating gate block (220), so that the floating gate block (220) can slide along the height direction of the gate frame (210). When the water level in the irrigation channel (100) reaches the upper limit of the irrigation channel (100), the flip valve (410) is just closed. The opening degree of the flip valve (410) is adjusted by the rack (430) driving the gear (420) to rotate.

2. A water-saving irrigation method for paddy fields using the irrigation structure described in claim 1, characterized in that: This method is specifically carried out in the following steps: Step 1: Initial Irrigation Step 1: During the initial irrigation process, the paddy fields (140) require a large amount of water, so open the water gates (120) at the water inlet of each field. Step 12: Open the channel gate (110) and ensure that the pin (340) is inserted into the limiting groove (223) of the floating gate block (220); Step 13: Start the pump to transport the water in the water-drying pond (130) to the water distribution tank (400). The water distribution tank (400) supplies water to the irrigation canal (100) through the drain valve, thereby realizing the delivery of irrigation water to each field. Step 2, Mid-Irrigation Step 21: Irrigation personnel close the canal gate (110) at the head of the canal. When the canal gate (110) is closed, the water supply gate (200) is opened, and the irrigation canal (100) continues to deliver water to each field. Step 22: Irrigation personnel go to the paddy fields (140) and adjust the water gates (120) in sequence according to the water consumption of each field to ensure that each field receives the corresponding amount of water. Step 3: Later Stages of Irrigation After irrigation of all fields is completed, the irrigation personnel close the water pumps and the water gates (120) at the water inlets of each field to end the irrigation.

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