JPH0430808B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to an underground irrigation system for underground tillage or cultivated land constructed with a combination culvert.

``Conventional technology'' Conventionally, in cultivated fields using underground irrigation methods, irrigation water was supplied above and below the rice field through underground pipes, timbered culverts, and bullet culverts. Then, the underground pipe was connected to a water level control weir, and the water level in the cultivated land was controlled by raising and lowering the weir door (Japanese Patent Application Laid-Open No. 185214/1982).In addition, when supplying pressurized water to the underground pipe, a discharge water tank was used. A pressure reducing valve was installed in the tank, and the opening and closing of the valve was adjusted by raising and lowering a float in the tank (Japanese Patent Application No. 60-90394, Patent Application No. 147019-1982). However, the response of the float and pressure reducing valve to fluctuations in the rice field water level is poor. For this reason, an invention was made in which the water was pumped from a water source pond to an underground pipe, and a water level or moisture detector was installed in the cultivated land to maintain the water level by operating a valve, but this required power and a large amount of equipment (especially 1986
−59897). Furthermore, it has been difficult to accurately and stably set appropriate water levels above and below the cultivated land according to the growth of crops.

"Problems to be Solved by the Invention" The present invention uses simple equipment for underground irrigation of cultivated land using pressurized water and does not require external power, and accurately and stably adjusts the water level from above to below the cultivated surface to suit the crops. It is an object of the present invention to provide an underground irrigation automation device using an on-off valve that can be set well, has good responsiveness to the set water level, and is highly safe.

"Means for Solving the Problems" The present invention supplies irrigation water to cultivated land from underground pipes through bullet culverts and timbered culverts installed in the same,
A water transmission pipe is opened in a water tank connected to the underground pipe, an on-off valve is installed in the water transmission pipe, and the underground pipe is connected to a water level adjustment tank equipped with an elevating overflow weir for setting the water level, and the overflow weir is The set water level can be set above and below the cultivated land, and the drive motor for the overflow weir, the drive motor for the on-off valve, and the power supply are connected via a controller, which is detected by a water level detector. An underground irrigation system for cultivated land, characterized in that the water level is compared with the water level set by the overflow weir, and the drive motor for the on-off valve is driven to open and close the on-off valve to control water replenishment. Composed by.

"Function" Therefore, the irrigation water supplied from the opening 16 of the water pipe 15 is stored in the water tank 14, and at the same time, the irrigation water is supplied to the cultivated land 7 via the underground pipe 11, the wood culvert 9, and the bullet culvert 8. and store water in the water level adjustment tank 12. Then, the irrigation water overflows the water level setting lifting overflow weir 6 provided in the adjustment tank 12 and is drained, and the water level of the irrigation water is set at an appropriate level above and below the cultivated land 7. The set water level is stored in the controller 4 in advance. The water level rises and falls above and below the memorized water level due to evaporation from the rice leaf surface and water surface. This rising and falling level is detected by the rice field water level detector 5, and the detection signal operates the controller 4 to compare it with the above-mentioned memorized set water level.If it is lower than the set water level, the on-off valve drive motor 2 is operated to operate the on-off valve. 1, water is sent from the opening 16 of the water pipe 15 to raise the water level in the water tank 14, and accordingly, the water level of the irrigation water in the cultivated land 7 is raised to the set water level and then stopped.

"Example" A plurality of bullet culverts 8 (unwooded culverts) are formed in the cultivated land 7 of rice fields, etc., and deep timbered culverts 9 (filled with rice husks, etc.) are provided orthogonally communicating with the culverts 8. An underground pipe 11 communicating with the timber culvert 9 through a pipe 10 is provided below. One end of this buried pipe 11 is connected to a discharge pipe 13 via a water level adjustment tank 12 equipped with a water level setting overflow weir 6 (shown in Figures 1 and 3) that can be raised and lowered, and the other end is connected to a water tank. Connect to the bottom of 14. As shown in FIG. 1, a water pipe 15 is inserted into this water tank 14 and opened upward, and the opening 1
6 is provided with an elevator opening/closing valve 1. This on-off valve 1 has a cylinder 1 provided in the opening 16 as shown in FIG.
It consists of a cylindrical valve 1' that is slidably fitted on the outer periphery of the cylinder 17, and a downward valve seat 1'' that is fixed to the cylinder 17 by a frame 17'. A lifting rod 20 is connected to the center of the lifting tool 18, and a ball screw is screwed into the spiral part 20' formed at the upper end of the lifting tool 18. By meshing the provided gear with the gear provided on the output shaft of the forward/reverse drive motor 2, the operating rod 20 is raised and lowered, and the on-off valve 1 is opened and closed.The internal pressure of the water pipe 15 is adjusted to approximately 0.2 kg/cm. The on-off valve 1 is regulated by the valve 21, and is opened and closed without being affected by the level of internal pressure.The electric motor 2
The power source is a solar cell 3 mounted on a stand 22 above the water tank 14, and connected via a controller 4. The overflow weir 6 is provided with a lifting weir door 6' as shown in Fig. 1, but it can also be provided with an elevating pipe 6'' as shown in Fig. 3. By connecting the upper end of the rod 23 to the driving electric motor 24, the weir door 6' or elevator pipe 6'' can be adjusted up and down.
A ball screw screwed into the spiral is rotated by the electric motor 24 to raise and lower it, and in FIG. The driving electric motor 24 is connected to the solar cell 3 via the controller 4, and by manually operating a push button on the controller 4, the electric motor 24 is operated in forward and reverse directions to open the overflow weir 6. Set the water level by raising and lowering the water level and store it in the controller 4. It is sufficient if the capacity of the electric motors 2 and 24 is about 15W.The water level can be set from 10 cm above the rice field to 80 cm below the rice field, or
cm or less, and intermittent flooding can be adjusted at 10 cm intervals using the cam switch. A rice field water level detector 5 is provided in the cultivated land 7, and the detector 5 is connected to the controller 4, so that the detected water level and the stored water level can be compared based on the detection signal. If the detected water level is lower than the set water level, an operation command signal is sent to the drive motor 2, and the motor 2 is operated to open the on-off valve 1 to raise the water level and reach the set water level. 5, this can be detected, the controller 4 can be operated in response to the detection signal, and the electric motor 2 can be stopped in response to the command signal. 25 in the figure
The one indicated by 26 is the water level sensor in the water tank 14.
27 is a cam switch provided on the operating rod 23, and 28 is a general drain gate.

"Effects" Since the present invention is based on the above-mentioned device, the water level can be remotely controlled from above to below the cultivated land 7 via the controller 4, and can be accurately and stably set to an appropriate water level, thereby improving the growth of crops. Not only can the water level be adapted to the situation, but it also has the effect of automatically responding to fluctuations in the detected water level relative to the set water level and automatically maintaining the set water level.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view showing the underground irrigation system for cultivated land according to the present invention, FIG. 2 is an enlarged vertical cross-sectional view of a lifting valve, and FIG. 3 is an enlarged vertical cross-sectional view of an embodiment of an overflow weir. 1... Lifting on/off valve, 2... Drive motor, 3...
Solar cell, 4...Controller, 5...Water level detector, 6...Elevating and overflowing weir for water level setting, 7...Cultivated land, 24...Driving electric motor.

Claims (1)

[Claims] 1. Supply irrigation water to the cultivated land from underground pipes through bullet culverts and material underdrains installed in the cultivated land, open a water pipe into a water tank connected to the buried pipe, and install an on-off valve in the water pipe, and the buried pipe is connected to a water level adjustment tank equipped with an elevating overflow weir for setting the water level, so that the water level set by the overflow weir can be set above and below the cultivated land,
The drive motor for the overflow weir, the drive motor for the on-off valve, and the power supply are connected via a controller, and the controller compares the water level detected by the water level detector with the water level set by the overflow weir. An underground irrigation system for cultivated land, characterized in that water replenishment is controlled by driving a drive motor for the on-off valve to open and close the on-off valve.