Irrigation gate for paddy field water depth control and water layer depth control method

Abstract

The invention relates to an irrigation gate for controlling the water depth of a paddy field, and the gate comprises a gate body which is rotatably connected with a mounting frame; the rotating mechanism is arranged on the mounting frame, and the rotating mechanism drives the gate body to rotate relative to the mounting frame; the sealing structure is arranged between the gate body and the mounting frame; the mounting frame is used for being arranged at a paddy field gate mounting position; and the control system is used for controlling the rotating mechanism to drive the gate body to rotate. The invention further relates to a water layer depth control method for paddy field water depth control. The irrigation gate provided by the invention can meet the water demands of different stages in the rice growth cycle, effectively optimizes water resource management, improves the irrigation and drainage efficiency, reduces the labor cost, is suitable for modern agricultural production, and belongs to the field of intelligent agricultural machinery equipment.

Description

Technical Field

[0001] The present invention relates to the field of intelligent agricultural machinery and equipment, and in particular to an irrigation gate for controlling the water depth of a paddy field and a water layer depth control method. Background Art

[0002] At present, most irrigation modes are canal irrigation. In the canal irrigation system, the most important part is the control of irrigation gates. However, there are certain problems in the real-time and accuracy of control, because it is difficult to adjust the water volume in time by manpower, and how big the gate is opened and how long it is open are all problems that are difficult to control by manpower. If handled improperly, it will affect crop growth and lead to waste of water resources.

[0003] The existing gates on the market are roughly divided into two categories: left-right rotating opening and closing type and up-and-down moving gate type. A common problem with some rotating gates is that their transmission shafts are set at the bottom of the gates, causing them to be often soaked under water and rusted and damaged. After a period of use, it is easy to get blocked due to the accumulation of some mud, sand and weeds, which makes the gate unable to rotate normally, reducing its service life, resulting in difficulties in repairing the gate in the later stage and high maintenance costs. The up-and-down gate type cannot control the water level in the field well, and the accumulation of weeds or mud and other materials in the field causes the gate to not seal well, and the maintenance of the water layer depth cannot meet the requirements of precise control.

[0004] In summary, it is difficult to control the size and timing of the opening and closing of the current gates, and they cannot meet the water demand at different stages of the rice growth cycle. Summary of the invention

[0005] In view of the technical problems existing in the prior art, the purpose of the present invention is to provide an irrigation gate for controlling the water depth of paddy fields and a water layer depth control method, which solves the problem that the existing gates are difficult to control the size and time of opening and closing, and cannot meet the water demand at different stages of the rice growth cycle.

[0006] In order to achieve the above object, the present invention adopts the following technical solution: An irrigation gate for controlling water depth in a paddy field, comprising: A gate body, which is rotatably connected to the mounting frame; A rotating mechanism, which is arranged on the mounting frame and drives the gate body to rotate relative to the mounting frame; A sealing structure, the sealing structure is arranged between the gate body and the mounting frame; An installation frame, the installation frame is used to be set at the paddy field gate installation location; The control system is used to control the rotating mechanism to drive the gate body to rotate.

[0007] As a preferred embodiment, the gate body includes a gate water retaining plate, a fan-shaped gear plate, a top support tube and a bottom support tube. There are two fan-shaped gear plates, and one straight edge of the two fan-shaped gear plates is respectively fixed to the two sides of the gate water retaining plate, and the other two ends of the straight edge of each fan-shaped gear plate are respectively connected to the end of the top support tube and the bottom support tube, and the two ends of the bottom support tube are respectively rotatably connected to the mounting frame; the arc edge on the fan-shaped gear plate is provided with a rack, and the rack is meshed with the rotating mechanism, the outer side of the fan-shaped gear plate is in contact with the sealing structure, and the outer side of the gate water retaining plate is in contact with the sealing structure.

[0008] As a preferred embodiment, the mounting frame includes a base plate, a vertical plate and a support plate, the number of the vertical plates and the support plates are both two, the bottom ends of the two vertical plates are respectively fixed to the two ends of the base plate, the two support plates are respectively fixed to the top ends of the two vertical plates, a gate top plate is connected between the two support plates, a rotating mechanism is arranged on the vertical plate, the gate body is rotatably connected to the vertical plate, and a sealing structure is arranged on the vertical plate and the base plate.

[0009] As a preferred embodiment, a gate fixing plate is provided on the outer side of the vertical plate, and the gate fixing plate is used to connect with both sides of the paddy field gate installation location.

[0010] As a preferred embodiment, a gate inner water retaining plate is provided between the vertical plate and the gate body, and the gate inner water retaining plate is in contact with the outer surface of the gate body.

[0011] As a preferred embodiment, the sealing structure includes a bottom sealing waterstop plate and a side sealing waterstop plate. The bottom sealing waterstop plate is arranged between the bottom of the mounting frame and the gate body. There are two side sealing waterstop plates, which are respectively arranged between the two sides of the gate body and the mounting frame.

[0012] As a preferred embodiment, the rotating mechanism includes a gate rotating shaft, a gear retaining ring, a gear plate and a motor. The motor is arranged on a mounting frame. The gate rotating shaft is rotatably connected to the mounting frame. The motor is connected to the gate rotating shaft to drive the gate rotating shaft to rotate. The gear plate is sleeved on the gate rotating shaft. The gear plate is meshed with the gate body. There are two gear retaining rings. Both gear retaining rings are sleeved on the gate rotating shaft. The two gear retaining rings are respectively located on both sides of the gear plate.

[0013] As a preference, the rotating mechanism further comprises a rotating handle, and the rotating handle is fixedly connected to the gate rotating shaft.

[0014] As a preference, it further comprises a water level detection module, and the water level detection module is connected to the control system via a wireless communication module.

[0015] A method for controlling the water depth of a paddy field, using an irrigation gate, and comprising the following steps: S1: Let the height from the bottom plate to the paddy field mud surface be h1 and the water layer depth be h, and establish the relationship between the height H of the gate retaining plate and the water layer depth h: H = h1 + h. Install the irrigation gate at the gate installation location according to the calculation result. S2: Determine the desired water layer depth h0 according to the water use requirements of the rice growth stage. S3: Detect the real-time water layer depth hs through the water level detection module. S4: Calculate the target angle , α = arcsin (h0 + h1) / L according to the mathematical relationship between the length L of the gate retaining plate and the desired water layer depth h0. S5: Control the gate retaining plate to rotate to the target angle ; S6: If the field water level is higher than the desired water layer depth h0, after the gate retaining plate rotates to the target angle , the water above the gate retaining plate will flow out by gravity until it is flush with the gate retaining plate, which is the desired water layer depth h0. S7: If the field water level is lower than the desired water layer depth h0, detect the real-time water layer depth hs and determine that hs < h0. When drainage and irrigation are carried out separately, the irrigation gate for drainage is adjusted to the angle corresponding to the desired water layer depth h0, and the irrigation gate for irrigation is adjusted to allow the lowest level for irrigation. When drainage and irrigation share the same gate, the gate retaining plate is adjusted to the lowest level. When the water level detection module detects that the real-time water layer depth reaches the desired water layer depth hs = h0, the gate retaining plate is adjusted to the angle corresponding to the desired water layer depth h0, and the excess water will flow out by gravity to ensure that the desired water layer depth is h0. angle, and the irrigation gate for irrigation is adjusted to allow the lowest level for irrigation. When drainage and irrigation share the same gate, the gate retaining plate is adjusted to the lowest level. When the water level detection module detects that the real-time water layer depth reaches the desired water layer depth hs = h0, the gate retaining plate is adjusted to the angle corresponding to the desired water layer depth h0, and the excess water will flow out by gravity to ensure that the desired water layer depth is h0. angle, and the excess water will flow out by gravity to ensure that the desired water layer depth is h0.

[0016] Generally speaking, the present invention has the following advantages: 1. The irrigation gate of the present invention can prevent blockage caused by straw, weeds, mud, etc. in the field, and the rotating mechanism is installed at the top of the gate body, which can effectively avoid problems such as rust and damage caused by the contact of the gate rotating shaft with water, improving its convenience and service life.

[0017] 2. The irrigation gate of the present invention adjusts the flipping angle of the gate body through the control system, thereby adjusting the water level height required in the field. The water level detection module monitors the field water depth information in real time and transmits the data to the control system. The control system issues a target water level height command to the rotating mechanism to adjust the gate body, realizing controllable water level. When the gate body rotates to a certain angle, the field water depth will remain unchanged. When encountering bad weather such as rain, the excess water in the field will be directly discharged without affecting the field water level, achieving the purpose of maintaining the water depth.

[0018] 3. The irrigation gate of the present invention can match the installation requirements of existing paddy field drainage outlets, can be well adapted to the installation of cement ridges and earth ridges, and has the characteristics of easy installation, wide adaptability, low cost, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a perspective view of the present invention.

[0020] Figure 2 It is a front view of the present invention.

[0021] Figure 3 It is a perspective view of the mounting frame.

[0022] Figure 4 It is a three-dimensional diagram of the rotating mechanism.

[0023] Figure 5 It is a three-dimensional diagram of the gate body.

[0024] Among them, 1 is a vertical plate, 2 is a seat bearing, 3 is a rotating mechanism, 4 is a rotating handle, 5 is a gate body, 6 is a bottom sealing water stop plate, 7 is a gate top plate, 8 is a control box, 9 is a motor, 10 is a latch, and 11 is a side sealing water stop plate.

[0025] 1-1 is the inner water retaining plate of the gate, and 1-2 is the gate fixing plate.

[0026] 3-1 is the gate rotating shaft, 3-2 is the gear retaining ring, 3-3 is the gear plate, and 3-4 is the keyway.

[0027] 5-1 is a gate water retaining plate, 5-2 is a sector gear plate, 5-3 is a top supporting pipe, and 5-4 is a bottom supporting pipe. DETAILED DESCRIPTION

[0028] The present invention will be further described in detail below in conjunction with specific implementation methods.

[0029] Embodiment 1 like Figure 1-Figure 5 As shown, the present embodiment provides an irrigation gate for controlling water depth in a paddy field, comprising: The gate body 5 is rotatably connected to the mounting frame; specifically, the gate body 5 includes a gate water retaining plate 5-1, a fan-shaped gear plate 5-2, a top support tube 5-3 and a bottom support tube 5-4. There are two fan-shaped gear plates 5-2, and one straight edge of the two fan-shaped gear plates 5-2 is respectively fixed to the two sides of the gate water retaining plate 5-1, and the other two ends of the straight edge of each fan-shaped gear plate 5-2 are respectively connected to the ends of the top support tube 5-3 and the bottom support tube 5-4, that is, the top support tube 5-3 and the bottom support tube 5-4 are spaced apart at both ends of a straight edge of the fan-shaped gear plate 5-2, and the top support tube 5-3 and the bottom support tube 5-4 are connected to the two ends of the straight edge of the fan-shaped gear plate 5-2. 5-3 and the bottom support tube 5-4 connect the two fan-shaped gear plates 5-2 to improve the firmness of the entire gate body 5. The two ends of the bottom support tube 5-4 are respectively rotatably connected with the two vertical plates 1. When the gear plate 3-2 rotates to drive the fan-shaped gear plate 5-2 to rotate, the entire gate body 5 rotates with the bottom support tube 5-4 as the rotation center; a rack is provided on the arc edge of the fan-shaped gear plate 5-2, and the rack is meshed with the gear plate 3-3. The outer side of the fan-shaped gear plate 5-2 contacts with the inner water retaining plate 1-1 and the side sealing water stop plate 11 of the gate. The outer side of the gate water retaining plate 5-1 contacts with the bottom sealing water stop plate 6 when it rotates close to the bottom plate.

[0030] It should be noted that, since the bottom support tube 5-4 is connected to the end of the sector gear plate 5-2, and the end of the sector gear plate 5-2 coincides with the end of the gate water retaining plate 5-1, the bottom support tube 5-4 is also connected to the gate water retaining plate 5-1, and the connection method is welding. After the gear plate 3-2 is meshed with the rack, the gear retaining ring 3-2 clamps the rack and the gear plate inside to avoid misalignment between the gear plate 3-2 and the rack, so that the gear sliding and deviation to the left and right will not occur. Internal threads are processed at both ends of the bottom support tube 5-4, and screws are connected to the two ends of the bottom support tube 5-4 through the internal threads. Through holes are opened in the two vertical plates, and the screws and the vertical plates are rotatably connected with the shaft holes.

[0031] Rotating mechanism 3, rotating mechanism 3 is arranged on vertical plate 1, rotating mechanism 3 drives gate body 5 to rotate relative to mounting frame; rotating mechanism 3 comprises gate rotating shaft 3-1, gear retaining ring 3-2, gear piece 3-3 and motor 9, motor 9 is arranged on vertical plate 1, gate rotating shaft 3-1 is rotatably connected with vertical plate 1 through seat bearing 2, keyway 3-4 is arranged on gate rotating shaft 3-1, gear piece 3-3 is connected with keyway 3-4 of gate rotating shaft 3-1 through key block, so that gear piece 3-3 is sleeved on gate rotating shaft 3-1, gear piece 3-3 is meshed with rack on sector gear plate 5-2, there are two gear retaining rings 3-2, two gear retaining rings 3-2 are sleeved on gate rotating shaft 3-1, two gear retaining rings 3-2 are respectively located on both sides of gear piece 3-3. The gear piece 3-3 is clamped by two gear retaining rings 3-2, so that one side of the gear retaining ring 3-2 is close to the shaft shoulder, and the other side of the gear retaining ring 3-2 is bolted to the gate rotating shaft 3-1, so that the gear piece 3-3 is fastened to the gate rotating shaft 3-1. The motor 9 and the gate rotating shaft 3-1 are fixedly connected by a latch 10. The motor 9 is fixedly installed on the vertical plate 1 with a screw, and the output shaft of the motor 9 is matched with one end of the gate rotating shaft 3-1 to maintain its coaxiality, and the two are locked together by the latch 10. The gate rotating shaft 3-1 is rotated by the power of the output shaft of the motor 9, thereby driving the gate body 5 to flip. In order to solve the problem of inaccurate gate position control caused by power failure of the motor 9 or manual adjustment of the gate, the motor 9 adopts a multi-turn steering gear control scheme, and the rotation stroke of the steering gear is adjusted by the PWM duty cycle to ensure that the gate position is accurate when the motor 9 is powered off or manually adjusted. The field water level is continuously adjusted by the rotation of the gate to ensure that the rice meets the agronomic requirements of its water consumption at every stage of its growth cycle. By setting the gate rotating shaft 3-1 of the rotating mechanism, the power source for the gate body rotation, above the gate body, and the driven shaft for the gate body rotation, the bottom support tube 5-4, at a relatively low position of the gate body, the drive shaft is prevented from contacting water, effectively avoiding the problem of rust or jamming of the bottom bearing of the traditional gate, thereby improving the durability and reliability of the gate.

[0032] In some embodiments, there are two transmission combinations of the above-mentioned gear plate 3-3 and gear retaining ring 3-2, and the two transmission combinations are spaced apart on the gate rotating shaft 3-1. The two transmission combinations correspond to the racks of the two fan-shaped gear plates 5-2 respectively, thereby achieving stable transmission.

[0033] The rotating mechanism 3 also includes a rotating handle 4, which is fixedly connected to the gate rotating shaft 3-1. By setting the rotating handle 4, it is used for manual flexible operation in power failure or emergency situation to ensure system reliability and safety.

[0034] A sealing structure, which is arranged between the gate body 5 and the mounting frame; specifically, the sealing structure includes a bottom sealing waterstop plate 6 and a side sealing waterstop plate 11, the bottom sealing waterstop plate 6 is arranged between the bottom plate and the gate body 5, and the number of the side sealing waterstop plates 11 is two, and the two side sealing waterstop plates 11 are respectively arranged between the two sides of the gate body 5 and the vertical plate 1, and the gap between the mounting frame and the gate body 5 is blocked by the bottom sealing waterstop plate 6 and the side sealing waterstop plate 11 to prevent water from the canal from flowing from the gap to the paddy field or from the paddy field to the canal.

[0035] The installation frame is used to be installed at the installation location of the paddy field gate; specifically, the installation frame includes a bottom plate, a vertical plate 1 and a support plate, the number of the vertical plates 1 and the support plate are both two, the bottom ends of the two vertical plates 1 are respectively fixed to the two ends of the bottom plate, the two support plates are respectively fixed to the top ends of the two vertical plates 1, a gate top plate 7 is connected between the two support plates, a rotating mechanism 3 is arranged on the vertical plate 1, the gate body 5 is rotatably connected to the vertical plate 1, and a sealing structure is arranged on the vertical plate 1 and the bottom plate. A gate fixing plate 1-2 is arranged on the outside of the vertical plate 1, and the gate fixing plate 1-2 is used to connect with both sides of the installation location of the paddy field gate. A gate inner water retaining plate 1-1 is arranged between the vertical plate 1 and the gate body 5, and the gate inner water retaining plate 1-1 is in contact with the outer surface of the gate body 5.

[0036] The control system is used to control the rotating mechanism 3 to drive the gate body 5 to rotate. The control system adopts the STM32L476RCT6 single-chip microcomputer as the main control, uses 4G communication mode, and transmits data through the MQTT protocol. Remote control is achieved through data communication with the unmanned farm cloud management and control platform.

[0037] The irrigation gate also includes a water level detection module, which is connected to the control system through a wireless communication module (4G antenna). The water level detection module uses an existing water level sensor to monitor field water level data in real time, and remotely and automatically adjusts the angle of the irrigation gate according to the set threshold, thereby achieving dynamic and precise control of the water level and intelligent feedback, thereby meeting the agronomic requirements of rice for water consumption at every stage of its growth cycle.

[0038] In the above embodiment, the gate fixing plate 1-2 is fixed to the inlet and outlet of the field ridge, so that the vertical plate 1 is close to the cement wall at the gap of the field ridge, and is fixed to the field ridge with expansion screws.

[0039] In the above embodiment, the motor 9 and the rotating mechanism 3 are both located above the gate body 5, so as to avoid rust and damage caused by contact with water, thereby improving their convenience and service life.

[0040] The control system of this embodiment also includes a solar panel, a battery, a power management module, a wireless communication module and a data acquisition interface. The solar battery is used for power supply, and is placed in the control box 8 together with the motor 9. The control box 8 is fixed on the outside of the vertical plate 1, and the solar charging panel is placed on the gate top plate 7. The power management module, the wireless communication module (4G), the Bluetooth short-range communication circuit and the data acquisition interface are connected in the control box 8. The power management module is connected to the power input port outside the control box, and the external power is converted into a voltage and current suitable for each hardware device through the internal circuit. The wireless communication module (4G) is connected to the microcontroller (STM32L476RCT6) inside the control box through the serial port, and the SIM card is inserted into the wireless communication module (4G) to ensure that it can be connected to the mobile communication network normally. The Bluetooth short-range communication circuit is connected to the microcontroller through the communication interface, and the antenna part of the Bluetooth short-range communication circuit is placed in a suitable position in the control box to ensure good signal transmission. According to the output interface type of the water level sensor (such as analog signal, digital signal, etc.), it is connected to the corresponding pin of the microcontroller through the data acquisition interface. At the same time, in order to ensure the accuracy and reliability of data acquisition, the collected signals need to be filtered, amplified and processed. The selection of these components is based on the functional requirements, performance stability, cost-effectiveness and ease of maintenance of the system. The integration of intelligent control systems covers data acquisition, transmission, processing and decision-making implementation modules to achieve automated operation and precise water level control.

[0041] The control system communicates data with the cloud management platform through the wireless communication module, and collects field water level data in combination with the water level detection module to achieve remote monitoring and control. The solar panel and battery combination provides environmentally friendly and reliable power support, so that the motor 9 and other electronic components can obtain power supply without pulling power lines from a distance. The control system is connected to the motor 9 and the water level sensor to accurately match the irrigation gate drainage rotation angle with the field water level height.

[0042] The gate rotating shaft 3-1 is driven to rotate by the motor 9, and the gate rotating shaft 3-1 drives the gear plate 3-3 to rotate, meshing with the rack of the fan-shaped gear plate 5-2, driving the entire gate body 5 to flip smoothly. The bottom sealing water stop plate 6 and the side sealing water stop plate 11 are both highly elastic and corrosion-resistant sealing water stop plates (rubber water stop plates). The bottom sealing water stop plate 6 is clamped by the fixed shaft and the bottom plate, and the side sealing water stop plate 11 is clamped by the inner water retaining plate 1-1 and the vertical plate 1 of the gate, which significantly improves the sealing performance and effectively prevents leakage. To ensure long-term excellent sealing. The mounting frame is used to firmly install the gate on the paddy field ridge to adapt to different terrain environments. The fan-shaped gear plate 5-2 is made of high-strength anti-corrosion alloy material.

[0043] Embodiment 2 A method for controlling the water layer depth of paddy fields provided in this embodiment. The method uses an irrigation gate and includes the following steps: S1: Taking the height from the bottom plate to the mud surface of the paddy field as h1 and the water layer depth as h, establish the relationship between the height H of the gate baffle 5-1 and the water layer depth h: H = h1 + h. Install the irrigation gate at the gate installation location according to the calculation result; S2: Determine the desired water layer depth h0 according to the water demand during the rice growth stage; S3: Detect the real-time water layer depth hs through the water level detection module; S4: Calculate the target angle according to the mathematical relationship between the length L of the gate baffle 5-1 and the desired water layer depth h0 , α = arcsin (h0 + h1) / L; S5: Control the gate baffle 5-1 to rotate to the target angle ; S6: If the field water level is higher than the desired water layer depth h0, after the gate baffle 5-1 rotates to the target angle , the water above the gate baffle 5-1 will flow out automatically until it is flush with the gate baffle 5-1, which is the desired water layer depth h0; S7: If the field water level is lower than the desired water layer depth h0, detect the real-time water layer depth hs and determine that hs < h0. When drainage and irrigation are carried out separately, the irrigation gate for drainage is adjusted to the angle corresponding to the desired water layer depth h0 , and the irrigation gate for irrigation is adjusted to allow the lowest level for irrigation. When drainage and irrigation share the same gate, the gate baffle 5-1 is adjusted to the lowest level. When the water level detection module detects that the real-time water layer depth reaches the desired water layer depth hs = h0, the gate baffle 5-1 is adjusted to the angle corresponding to the desired water layer depth h0 , and the excess water will flow out automatically to ensure that the desired water layer depth is h0.

[0044] The parts not mentioned in this embodiment are the same as those in Embodiment 1.

[0045] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention shall be equivalent replacement methods and are all included in the protection scope of the present invention.

Claims

1. An irrigation gate for controlling water depth in paddy fields, characterized in that: include: A gate body, which is rotatably connected to the mounting frame; A rotating mechanism, which is arranged on the mounting frame and drives the gate body to rotate relative to the mounting frame; A sealing structure, the sealing structure is arranged between the gate body and the mounting frame; An installation frame, the installation frame is used to be set at the paddy field gate installation location; The control system is used to control the rotating mechanism to drive the gate body to rotate.

2. An irrigation gate for controlling water depth in paddy fields according to claim 1, characterized in that: The gate body includes a gate water retaining plate, a fan-shaped gear plate, a top support tube and a bottom support tube. There are two fan-shaped gear plates. One straight edge of the two fan-shaped gear plates is fixed to the two sides of the gate water retaining plate respectively. The other two ends of the straight edge of each fan-shaped gear plate are respectively connected to the end of the top support tube and the bottom support tube, and the two ends of the bottom support tube are respectively connected to the mounting frame for rotation. The arc edge on the fan-shaped gear plate is provided with a rack, which is meshed with the rotating mechanism. The outer side of the fan-shaped gear plate is in contact with the sealing structure, and the outer side of the gate water retaining plate is in contact with the sealing structure.

3. An irrigation gate for controlling water depth in paddy fields according to claim 1, characterized in that: The mounting frame includes a bottom plate, a vertical plate and a supporting plate. There are two vertical plates and two supporting plates. The bottom ends of the two vertical plates are respectively fixed at the two ends of the bottom plate, and the two supporting plates are respectively fixed at the top ends of the two vertical plates. A gate top plate is connected between the two supporting plates. The rotating mechanism is arranged on the vertical plate. The gate body is rotatably connected to the vertical plate. A sealing structure is arranged on the vertical plate and the bottom plate.

4. An irrigation gate for controlling water depth in paddy fields according to claim 3, characterized in that: A gate fixing plate is provided on the outer side of the vertical plate, and the gate fixing plate is used to be connected with both sides of the paddy field gate installation location.

5. An irrigation gate for controlling water depth in paddy fields according to claim 3, characterized in that: An inner water retaining plate of a gate is arranged between the vertical plate and the gate body, and the inner water retaining plate of the gate is in contact with the outer surface of the gate body.

6. An irrigation gate for controlling water depth in paddy fields according to claim 1, characterized in that: The sealing structure includes a bottom sealing waterstop plate and a side sealing waterstop plate. The bottom sealing waterstop plate is arranged between the bottom of the installation frame and the gate body. There are two side sealing waterstop plates, which are respectively arranged between the two sides of the gate body and the installation frame.

7. An irrigation gate for controlling water depth in paddy fields according to claim 1, characterized in that: The rotating mechanism includes a gate rotating shaft, a gear retaining ring, a gear plate and a motor. The motor is arranged on a mounting frame. The gate rotating shaft is rotatably connected to the mounting frame. The motor is connected to the gate rotating shaft to drive the gate rotating shaft to rotate. The gear plate is sleeved on the gate rotating shaft. The gear plate is meshed with the gate body. There are two gear retaining rings. Both gear retaining rings are sleeved on the gate rotating shaft. The two gear retaining rings are respectively located on both sides of the gear plate.

8. An irrigation gate for controlling water depth in paddy fields according to claim 7, characterized in that: The rotating mechanism also includes a rotating handle, which is fixedly connected to the gate rotating shaft.

9. An irrigation gate for controlling water depth in paddy fields according to claim 1, characterized in that: It also includes a water level detection module, which is connected to the control system through the wireless communication module.

10. A method for controlling the water depth of a paddy field, characterized in that: The method adopts the irrigation gate according to any one of claims 1 to 9, and the method comprises the following steps: S1: With the height from the bottom plate to the paddy field mud surface as h1 and the water layer depth as h, establish the relationship between the gate water retaining plate height H and the water layer depth h: H=h1+h. According to the calculation results, install the irrigation gate at the gate installation location; S2: Determine the expected water layer depth h0 according to the water demand during the rice growth stage; S3: Detect the real-time water layer depth hs through the water level detection module; S4: Calculate the target angle based on the mathematical relationship between the gate water retaining plate length L and the desired water layer depth h0 , α=arcsin (h0+h1) / L; S5: Control the gate water retaining plate to rotate to the target angle ; S6: If the field water level is higher than the expected water layer depth h0, the gate water retaining plate rotates to the target angle After that, the water above the gate water retaining plate will be discharged by gravity until it is flush with the gate water retaining plate, which is the expected water layer depth h0; S7: If the field water level is lower than the expected water layer depth h0, the real-time water layer depth hs is detected and it is determined that hs < h0. When drainage and irrigation are carried out separately, the irrigation gate for drainage is adjusted to the angle corresponding to the expected water layer depth h0, and the irrigation gate for irrigation is adjusted to the lowest level allowed for irrigation. When drainage and irrigation share the same gate, the gate baffle is adjusted to the lowest level. When the water level detection module detects that the real-time water layer depth reaches the expected water layer depth hs = h0, the gate baffle is adjusted to the angle corresponding to the expected water layer depth h0, and the excess water will flow out by gravity to ensure that the expected water layer depth is h0. When drainage and irrigation are carried out separately, the irrigation gate for drainage is adjusted to the angle corresponding to the expected water layer depth h0, and the irrigation gate for irrigation is adjusted to the lowest level allowed for irrigation. When drainage and irrigation share the same gate, the gate baffle is adjusted to the lowest level. When the water level detection module detects that the real-time water layer depth reaches the expected water layer depth hs = h0, the gate baffle is adjusted to the angle corresponding to the expected water layer depth h0, and the excess water will flow out by gravity to ensure that the expected water layer depth is h0. The excess water will flow out by gravity to ensure that the expected water layer depth is h0.

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