JP2017192366A - Field water supply and drainage system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a field water supply and drainage system that can remotely operate or automate field water management at low cost.SOLUTION: According to the present invention, a field water supply and drainage system 100 is a system for performing inter-field water management by remote control or automatic control. The system comprises: a first electric actuator attached to a water supply device 104 via a first adapter 60 to operate a valve body, etc. provided in the water supply device; and a second electric actuator attached to a drainage device 106 via a second adapter 70 to operate a partition body 142, etc. of the drainage device. As the first electric actuator and the second electric actuator, electric actuators 10 having the same structure are used.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a field water supply / drainage system, and in particular, for example, a water supply device having a first displacement mechanism for controlling water supply to a field, and a drainage device having a second displacement mechanism for controlling drainage from the field. The present invention relates to a water supply / drainage system for a farm used for water management of the farm.

  Remote operation or automation of water management in the field, which is often performed manually on site, is desired. In order to perform this water management appropriately, it is necessary to control both a water supply device such as a water supply valve that controls water supply to the field and a drainage device such as a water outlet that controls drainage from the field.

  An example of an electric actuator for performing opening / closing control of a water supply apparatus is disclosed in Patent Document 1. Patent Document 1 discloses an automatic faucet opening and closing device that is attached to an existing faucet and automatically opens and closes the faucet. This automatic faucet opening and closing device connects a solar cell, a storage battery for storing electric energy generated by the solar cell, a motor driven by the electric energy, an output shaft of the motor, and a drive shaft of the faucet. And a driving force transmission mechanism for transmitting the driving force of the motor to the driving shaft of the faucet. The driving force transmission mechanism includes a gear mechanism connected to the output shaft of the motor, a first shaft that is provided below the gear mechanism and that does not move up and down, and a second shaft that can move up and down relative to the first shaft. And a rotating shaft.

  Patent Document 1 discloses a water supply weir automatic opening / closing device that is attached to an existing water supply weir and automatically opens and closes the water supply weir. The drive force transmission mechanism of the automatic water supply weir switching device is provided below the gear mechanism connected to the output shaft of the motor, and is movable up and down relative to the first shaft and the first shaft that are not moved up and down. A rotation shaft including the second shaft, a male screw connected to the second shaft, a female screw provided on the bottom of the housing, and an output shaft coupled to a lower portion of the male screw.

  On the other hand, Patent Document 2 discloses an example of a drainage device having a sluice part for controlling drainage from paddy fields. In the drainage device of Patent Document 2, an electric actuator that operates a sluice part is integrated in advance. Specifically, the drainage device of Patent Document 2 includes a sluice part incorporating an overflow plate for changing the overflow water level, and an upright tubular column is welded to the upper surface of the sluice part. Further, an actuator body (control box) including a receiving unit, a control unit, a battery, and a drive mechanism unit is provided on the support column, and the displacement of the drive mechanism unit in the actuator body is caused by an operation rod passing through the support column. It is transmitted to the overflow plate. Furthermore, a solar cell panel is provided on the actuator body.

JP-A-8-70716 JP-A-10-280371

  In the technique of Patent Document 1, electric actuators having different structures are used for the water faucet and the water supply weir. That is, a dedicated electric actuator corresponding to the type (type) of the water supply apparatus must be prepared. Moreover, the electric actuator of Patent Document 1 cannot be applied to a drainage device such as a water outlet.

  Furthermore, in the technique of Patent Document 1, in order to absorb the vertical movement of the driving shaft of the water faucet, the first axis that does not move up and down, and the second axis that can move up and down relative to the first axis, under the gear mechanism. A rotating shaft is provided. For this reason, in the technique of Patent Document 1, a large space in the vertical direction is required as the expansion / contraction space of the rotating shaft under the space where the gear mechanism is provided, and the electric actuator becomes large.

  On the other hand, the technique of Patent Document 2 has a structure in which the electric actuator is previously incorporated into the drainage device, and the electric actuator cannot be installed later on the existing drainage device. Of course, it cannot be applied to a water supply device such as a water supply valve.

  Thus, in the prior art, in order to realize remote operation or automation of field water management, it is necessary to prepare electric actuators having different structures on the water supply device side and the drainage device side. Since it is necessary to prepare individually the electric actuator according to the form of an apparatus and the form of a drainage device, it costs.

  Therefore, a main object of the present invention is to provide a novel field water supply / drainage system.

  Another object of the present invention is to provide a farm water supply / drainage system that can realize remote operation or automation of farm water management at low cost.

  According to a first aspect of the present invention, a water supply device having a first displacement mechanism for controlling water supply to a field and a drainage device having a second displacement mechanism for controlling drainage from the field are installed. A field water supply / drainage system used for water management, wherein a first electric actuator for operating a first displacement mechanism, a first adapter for attaching the first electric actuator to a water supply device, and a second actuator for operating a second displacement mechanism. Two electric actuators, and a second adapter for attaching the second electric actuator to the drainage device, and each of the first electric actuator and the second electric actuator includes a main body case, a solar cell panel attached to the main body case, and a main body A storage battery installed in the case and capable of storing the power generated by the solar panel, installed in the body case A motor driven by electric power, provided in the main body case and controlling the motor drive, a gear provided in the main body case and rotated by the driving force from the motor, and the shaft center of the gear It is provided as mentioned above, It is a water supply / drainage system for fields provided with the rotating shaft which rotates with the said gear and is slidable in the axial direction of the said gear.

  In the first invention, the field water supply / drainage system is applied to a field such as a paddy field in which a water supply device such as a water supply valve and a drainage device such as a water outlet are installed to remotely control or automatically control water management in the field. Etc. The field water supply / drainage system includes a first electric actuator that operates a first displacement mechanism included in the water supply apparatus, a first adapter for attaching the first electric actuator to the water supply apparatus, and a second displacement mechanism included in the drainage apparatus. And a second adapter for attaching the second electric actuator to the drainage device. And as a 1st electric actuator and a 2nd electric actuator, it provided so that a main body case, a solar cell panel, a storage battery, a motor, a control part, a gear, and the shaft center of a gear might rotate, The thing provided with the rotating shaft which can slide to an axial direction is used. That is, an electric actuator having the same basic structure is used as the first electric actuator and the second electric actuator.

  That is, in this field water supply / drainage system, the rotating shaft that rotates together with the main gear and is slidable in the axial direction of the main gear is attached by using an electric actuator provided so as to penetrate the shaft center of the main gear. Only by preparing adapters (first adapter and second adapter) suitable for the water supply device and the drainage device, electric actuators having the same structure can be installed later on the water supply device side and the drainage device side.

  According to the first invention, since the electric actuator having the same structure is used on the water supply device side and the drainage device side, remote operation or automation of farm water management can be realized at low cost.

  Further, since the rotation shaft is provided so as to penetrate the center of the shaft of the gear, the electric actuator can be reduced in size. Therefore, it is possible to prevent the electric actuator from interfering with farm work.

  A second invention is dependent on the first invention, wherein the first displacement mechanism includes a valve body or a partition that moves up and down with the rotation of the support rod, and the rotation shaft of the first electric actuator is the first displacement mechanism. It is connected with the support bar which has.

  In 2nd invention, the 1st displacement mechanism of a water supply apparatus contains the valve body or partition which moves up and down with rotation of support rods, such as a valve shaft. Then, the rotation shaft of the first electric actuator is connected to the support rod included in the first displacement mechanism, and the rotation shaft rotates the support rod, whereby the valve body or the partition body is moved to a predetermined position.

  A third invention is dependent on the first invention, the first displacement mechanism includes a valve body or a partition provided so as to be movable up and down, and the first adapter includes a movable portion that moves up and down by a screw mechanism, The rotating shaft of the first electric actuator is connected to the valve body or the partition body included in the first displacement mechanism via the movable portion of the first adapter.

  In 3rd invention, the 1st displacement mechanism of the water supply apparatus contains the valve body or partition provided so that a vertical motion is possible. That is, the first displacement mechanism itself does not have a mechanism for converting the rotational force into a vertical force. For this reason, in the third invention, a movable portion that moves up and down by a screw mechanism is provided in the first adapter. Then, the rotating shaft of the first electric actuator is connected to the valve body or partition body of the first displacement mechanism via the movable portion of the first adapter, and the rotating shaft operates the screw mechanism to The body or the partition is moved to a predetermined position. However, “connecting via a movable part” includes the case of direct connection and the case of indirect connection via another member.

  A fourth invention is dependent on any one of the first to third inventions, wherein the second displacement mechanism includes a valve body or a partition body that moves up and down with the rotation of the support rod, and the rotation shaft of the second electric actuator. Is coupled to a support bar of the second displacement mechanism.

  In 4th invention, the 2nd displacement mechanism of a drainage device contains the valve body or partition which moves up and down with rotation of support rods, such as a valve shaft. And the rotating shaft of a 2nd electric actuator is connected with respect to the support rod which this 2nd displacement mechanism has, and a valve body or a partition body is moved to a predetermined position by rotating a support rod.

  A fifth invention is dependent on any one of the first to third inventions, the second displacement mechanism includes a valve body or a partition body provided so as to be movable up and down, and the second adapter is moved up and down by a screw mechanism. The rotating shaft of the second electric actuator is coupled to the valve body or the partition body of the second displacement mechanism via the movable portion of the second adapter.

  In 5th invention, the 2nd displacement mechanism of the drainage device contains the valve body or partition provided so that a vertical motion is possible. That is, the second displacement mechanism itself does not have a mechanism for converting a rotational force into a vertical force. For this reason, in the fifth invention, the second adapter is provided with a movable portion that moves up and down by a screw mechanism. Then, the rotary shaft of the second electric actuator is connected to the valve body or the partition body of the second displacement mechanism via the movable portion of the second adapter, and the rotary shaft operates the screw mechanism, whereby the valve The body or the partition is moved to a predetermined position. However, “connecting via a movable part” includes the case of direct connection and the case of indirect connection via another member.

  A sixth invention is dependent on any one of the first to fifth inventions, and the main body case has a cylindrical side wall and a top wall that seals an upper portion of the side wall, and the side wall and the top wall are airtight. It has a structure.

  In 6th invention, the main body case with which a 1st actuator and a 2nd actuator are provided is formed so that a side wall and a top wall may have an airtight structure. As a result, even if the bottom surface of the main unit case is not airtight, air in the main unit case will not escape when the main unit case is submerged during a flood, etc., thus preventing water from entering the main unit case. Can do.

  According to the sixth invention, even if the main body case is submerged, it is possible to prevent parts such as the control unit disposed in the main body case from getting wet.

  According to this invention, since the electric actuators having the same structure are used on the water supply device side and the drainage device side, remote operation or automation of farm water management can be realized at low cost.

  Further, since the rotation shaft is provided so as to penetrate the center of the shaft of the gear, the electric actuator can be reduced in size. Therefore, it is possible to prevent the electric actuator from interfering with farm work.

  The above object, other objects, features, and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

It is an illustration figure which shows the water supply / drainage system for agricultural fields which is one Example of this invention. It is an illustration figure which shows the external appearance of the electric actuator with which the water supply / drainage system for fields of FIG. 1 is provided. It is an illustration figure which shows the internal structure of the electric actuator of FIG. FIG. 4 is a partially enlarged view showing an enlarged peripheral portion of the main gear in FIG. 3. It is an illustration figure for demonstrating the airtight structure of the main body case with which the electric actuator of FIG. 2 is provided. It is an illustration figure which shows the 1st adapter with which the water supply / drainage system for fields of FIG. 1 is provided. It is an illustration figure which shows a mode that the electric actuator of FIG. 2 was attached to the water supply valve. It is an illustration figure which shows the 2nd adapter with which the water supply / drainage system for fields of FIG. 1 is provided. It is an illustration figure which shows a mode that the electric actuator of FIG. 2 was attached to the water outlet. It is an illustration figure which shows a mode that the electric actuator of FIG. 2 was attached to the gate valve. It is an illustration figure which shows a mode that the electric actuator of FIG. 2 was attached to the water level control apparatus. It is an illustration figure which shows another example of an electric actuator. It is an illustration figure which shows another example of an electric actuator. It is an illustration figure which shows another example of an electric actuator.

  Referring to FIG. 1, a field water supply / drainage system 100 (hereinafter simply referred to as “system 100”) according to an embodiment of the present invention includes an electric actuator 10 (hereinafter simply referred to as “actuator 10”). Including. The system 100 is applied to a field 102 such as a paddy field in which a water supply device 104 such as a water supply valve and a drainage device 106 such as a water outlet are installed, and the water management of the field 102 is remotely operated or stored in a pre-stored program. Based on automatic control based on. As will be described in detail later, in this system 100, both the first electric actuator that operates the first displacement mechanism included in the water supply device 104 and the second electric actuator that operates the second displacement mechanism included in the drainage device 106 are actuators. 10 is used.

  As shown in FIG. 1, the farm field 102 is divided into a plurality of cultivated areas by the bank, and the water supply device 104 and the drainage device 106 are installed for each cultivated area.

  The water supply device 104 is a device for controlling water supply to the cultivation area (the field 102), and has a displacement mechanism (first displacement mechanism) including a valve body or a partition body. In this embodiment, as the water supply device 104, an alfalfa-type water supply valve of an R & R method (a method in which the shaft moves up and down as the shaft rotates) is widely used.

  Briefly described with reference to FIG. 1 and FIG. 7, the water supply apparatus 104 of this embodiment includes a cylindrical valve box 120. The upper half of the valve box 120 is covered with a dome-shaped cap 122, and a plurality of water outlet windows 124 are formed in the circumferential direction in the upper part of the side wall of the valve box 120. The upper end of the valve box 120 is provided with a bearing 126 having an internal thread formed on the inner peripheral surface. The bearing 126 has a valve shaft having an external thread formed on the outer peripheral surface so as to penetrate the cap 122. 128 is screwed together. At the lower end of the valve shaft 128, a disc-shaped valve body 130 having a water stop rubber 130a on the lower surface is provided. Further, a valve seat 132 having a water passage 132a is provided at a substantially central portion in the valve box 120. When a rotational force about the axis is applied to the valve shaft 128, the valve shaft 128 and the valve body 130 are moved up and down by the feed screw mechanism, and the water passage 132a of the valve seat 132 is opened and closed. That is, the water supply device 104 of this embodiment includes a first displacement mechanism including a valve body 130 that moves up and down with the rotation of the valve shaft (support rod) 128.

  Such a water supply device 104 is disposed, for example, in the water tank 108 and is attached to the downstream end of the branch pipe 112 branched from the water pipeline 110 or the water channel. And the actuator 10 is attached to the water supply apparatus 104 via the 1st adapter 60 mentioned later, The 1st displacement mechanism (the valve shaft 128 and the valve body 130) of the water supply apparatus 104 is operated by this actuator 10.

  On the other hand, the drainage device 106 is a device for controlling drainage from the field 102 and has a displacement mechanism (second displacement mechanism) including a valve body or a partition body. In this embodiment, a water outlet having a water level setting function is used as the drainage device 106.

  Briefly described with reference to FIG. 1 and FIG. 9, the drainage device 106 of this embodiment is inserted into the short cylindrical rubber receiving frame member 140 and the receiving frame member 140 and can be moved up and down by the receiving frame member 140. And a cylindrical partition body (weir body) 142 supported by. The upper end opening of the partition 142 functions as a drain outlet. When a force is applied to the partition 142 in the vertical direction (axial direction), the partition 142 moves up and down, and the drain outlet is adjusted to an arbitrary height. That is, the drainage device 106 of this embodiment includes a second displacement mechanism including a partition 142 that is provided so as to be movable up and down.

  Such a drainage device 106 is disposed, for example, in the drainage basin 114 and is attached to an upstream end portion of the drainage pipe 118 extending to the drainage channel 116. Then, the actuator 10 is attached to the drainage device 106 via a second adapter 70 described later, and the actuator 10 operates the second displacement mechanism (partition body 142) of the drainage device 106.

  In FIG. 1, the water supply device 104 is arranged on one end side of the field 102 and the drainage device 106 is arranged on the opposite side, but the arrangement positions of the water supply device 104 and the drainage device 106 can be changed as appropriate. . For example, the water supply device 104 and the drainage device 106 may be disposed in the vicinity.

  Moreover, the system 100 in this embodiment is a system including a plurality of cultivated zones, and at least one actuator among the actuators 10 attached to each of the water supply device 104 and the drainage device 106 installed in each cultivated zone. 10 is a master unit, and the remaining actuators 10 are slave units. The actuator 10 serving as a parent device is connected to a remote operation terminal such as a smartphone, a tablet terminal, a PDA and a PC owned by the user via a network such as the Internet so as to be capable of wireless communication. On the other hand, the actuator 10 serving as a slave unit is connected to the master unit so as to be able to communicate with the master unit directly or via another slave unit by a wireless communication method in accordance with a specific low power wireless standard. Via a wireless connection to a remote control terminal owned by the user. However, a device other than the actuator 10 may be separately installed as the parent device.

  In this wireless communication, cloud computing may be used. For example, information acquired by each actuator 10 (information on the state of the water supply device 104 or the drainage device 106 such as the degree of opening and closing of the valve body, and sensor information such as the field water level and temperature) is transmitted to the cloud server as needed and stored. Keep it. The user checks the information acquired by each actuator 10 by accessing the cloud server from the remote operation terminal, and performs water management of the farm field 102 by remotely operating each actuator 10 using the remote operation terminal. .

  However, the system 100 does not necessarily need to be a system that spans a plurality of cultivated zones, and the farm field 102 to which the system 100 is applied may be a farm field in which at least one water supply device 104 and one drainage device 106 are installed. That's fine.

  Subsequently, the configuration of the actuator 10 will be described in detail. As shown in FIGS. 2 to 4, the actuator 10 includes a main body case 20 formed of a synthetic resin such as hard polyvinyl chloride. The main body case 20 includes a cylindrical side wall 22 and a top wall 24 that seals the upper end of the side wall 22. The lower end portion of the side wall 22 is reduced in a stepped shape, and this reduced diameter portion becomes a fitting portion 26 that is inserted into an upper opening of the first adapter 60 or the second adapter 70 described later. The main body case 20 has a height dimension of, for example, 300 mm, and the main body case 20 has an outer diameter of, for example, 200 mm.

  A solar cell panel 28 is attached to the upper surface of the top wall 24 of the main body case 20. The solar battery panel 28 is formed by packaging a plurality of solar battery cells in a square shape with tempered glass and a sealing material, and is supported by a holding body 30. The holding body 30 is formed of metal or resin, for example, a rectangular frame-shaped frame 30a provided so as to cover the periphery of the solar cell panel 28, and a support provided on the lower surface of the frame 30a and bent at a predetermined angle. Plate 30b.

  Inside the main body case 20, a control panel 32, an antenna 34, a storage battery 36, a motor 38, a main gear 40, and the like are accommodated.

  Although not shown, the control panel 32 includes a control unit including a CPU and a memory, a wireless communication unit for performing wireless communication with other devices, a switch such as a main power supply, and the like. The CPU of the control unit controls the entire actuator 10 and controls the driving of the motor 38 and the like based on a control program stored in the memory. The wireless communication unit performs wireless communication with the remote operation terminal owned by the user and other actuators 10 through the antenna 34 as described above.

  The storage battery 36 stores the electric power generated by the solar battery panel 28. The motor 38 is driven by electric power stored in the storage battery 36, that is, electric power generated by the solar battery panel 28. A small gear 42 is provided at the tip of the output shaft 38a of the motor 38, and the main gear 40 is connected to the small gear 42 so that it receives a driving force from the motor 38 and rotates around the axis. Rotate.

  In this embodiment, a motor with an encoder is used as the motor 38. The encoder of the motor 38 outputs a pulse signal corresponding to the rotation direction and the rotation speed of the output shaft 38a to the CPU of the control unit. The CPU of the control unit calculates the position of the valve body 130 of the water supply device 104 or the partition body 142 of the drainage device 106 based on the pulse signal input from the encoder, that is, the rotation direction and the rotation speed of the output shaft 38a. That is, the encoder is used as a position detection unit that detects the position of the valve body 130 or the partition body 142. However, the encoder that functions as the position detection unit is not necessarily provided in the motor 38. The encoder is provided in the main gear 40, and the valve body 130 or the partition body 142 is determined based on the rotation direction and the rotation speed of the main gear 40. It is also possible to calculate the position. Further, the control panel 32 is provided with a current value detection unit such as a current sensor (current transformer) for detecting a motor current value, and detection data in the current value detection unit is input to the CPU of the control unit.

  The main gear 40 is a double boss type gear, and includes a cylindrical shaft portion (boss portion) 40a extending in the vertical direction and a disk-like gear portion 40b having gear teeth formed on the outer peripheral surface. A disc-shaped first bearing 44 that also serves as a bottom wall of the main body case 20 is provided at the lower end of the side wall 22 of the main body case 20, and a plurality of support portions are disposed above the first bearing 44. A disc-shaped second bearing 48 supported by 46 is provided. The both end portions of the shaft portion 40a of the main gear 40 are rotatably held by the first bearing 44 and the second bearing 48.

  A substantially cylindrical rotating shaft 50 is inserted into the shaft portion 40 a of the main gear 40. That is, the rotation shaft 50 is provided so as to penetrate the center of the main gear 40. A coupling portion 50a that is non-rotatably connected to a valve shaft 128 of the water supply device 104 or an upper end portion of a connecting shaft 80 of the second adapter 70 described later is formed at the lower end portion of the rotating shaft 50. A key groove 40c extending in the axial direction is formed on the inner peripheral surface of the shaft portion 40a of the main gear 40, and a sliding key 50b fitted to the key groove 40c is formed on the outer peripheral surface of the rotary shaft 50. It is formed so as to extend along the axial direction. As a result, the rotation shaft 50 rotates as the main gear 40 rotates and can slide in the axial direction with respect to the shaft portion 40 a of the main gear 40. Further, a thrust bearing 52 is provided between the upper surface of the gear portion 40b of the main gear 40 and the lower surface of the second bearing 48, and between the lower surface of the gear portion 40b of the main gear 40 and the upper surface of the first bearing 44, respectively. Provided. In addition, although not shown in the drawings, a hook portion for preventing the removal can be formed at the upper end portion of the rotating shaft 50.

  Although not shown, the farm 102 has a water level sensor such as an ultrasonic sensor that detects the farm water level, a temperature sensor that detects air temperature, a pressure sensor that detects atmospheric pressure, and a sensor such as a moisture sensor that detects soil moisture. Is provided as appropriate. Sensor information such as the field water level and temperature detected by each sensor is input to the control unit of the actuator 10.

  Further, the main body case 20 in this embodiment is formed such that the side wall 22 and the top wall 24 have an airtight structure. However, “airtight” in the present invention means that even if the water level of the field 102 reaches the maximum water level assumed at the time of flooding and the main body case 20 is submerged, the air in the main body case 20 does not leak from that portion (the main body case) It means that airtightness and watertightness are maintained during the service life to the extent that water does not enter 20).

  Specifically, the main body case 20 in this embodiment is configured by combining a first case member 20a, a second case member 20b, and a third case member 20c. The first case member 20 a constitutes the upper part of the top wall 24 and the side wall 22 of the main body case 20, the second case member 20 b constitutes the lower part of the side wall 22, and the third case member 20 c is the lower end portion of the side wall 22. And the bottom wall (first bearing 44). Each of the first case member 20a, the second case member 20b, and the third case member 20c is an integrated type without a connecting portion (seam), and the connecting portion between the first case member 20a and the second case member 20b. And the O-ring 54 is provided in the connection part of the 2nd case member 20b and the 3rd case member 20c, respectively. As a result, the side wall 22 and the top wall 24 of the main body case 20 have an airtight structure. Further, the first case member 20a and the second case member 20b are detachably connected, and the second case member 20b and the third case member 20c are detachably connected. When inspecting the components in the main body case 20, the first case member 20a and the second case member 20b are appropriately removed.

  Here, in order to prevent water from entering the main body case 20, it is only necessary that the main body case 20 can be formed to have an airtight structure. However, the actuator 10 includes a rotating shaft 50 that is connected to the valve shaft 128 of the water supply device 104 and the like. It is difficult to make an airtight structure. Therefore, in this embodiment, the side wall 22 and the top wall 24 of the main body case 20 are configured to have an airtight structure, and the rotating shaft 50 is protruded from the lower surface side (bottom wall side) of the main body case 20. Accordingly, even if the lower surface side of the main body case 20 does not have an airtight structure, when the main body case 20 is submerged during a flood or the like, the air in the main body case 20 cannot be removed. Infiltration can be prevented. Therefore, even if the main body case 20 is submerged, it is possible to prevent parts such as the control panel 32 disposed in the main body case 20 from getting wet.

  However, when the lower surface side of the main body case 20 does not have an airtight structure, a slight amount of water enters the main body case 20 from the lower surface side according to the water level when submerged. Therefore, as shown in FIG. 5, at least the control panel (control unit) 32, the contact part of the storage battery 36, and the motor 38, etc. It is good to arrange | position in the main body case 20 above the lower limit height position X calculated | required based on a flooded water level. That is, the maximum water level in the main body case 20 when the maximum water level assumed at the time of flooding is set as the lower limit height position X, and at least the control panel 32 and the storage battery above the lower limit height position X. The electrical parts such as the 36 contact portions and the motor 38 may be arranged. Preferably, driving components such as the main gear 40 and the thrust bearing 52 are also disposed above the lower limit height position X.

Specifically, the lower limit height position X is a position obtained by the following equation (Equation 1).
[Equation 1]
ΔH = H + 10−10V / (V−ΔV)
Here, ΔH is a distance [m] from the lower end Y of the main body case 20 to the lower limit height position (maximum flooded water level) X, and H is the maximum water level Z assumed during flooding from the surface Z of the main body case 20. The distance [m] to the lower end Y, V is the gap volume [m ³ ] in the main body case 20, and ΔV is in the main body case 20 from the lower end Y of the main body case 20 to the lower limit height position X. It is a gap volume [m ³ ]. However, the lower end Y of the main body case 20 here means the lower end of the portion having the airtight structure of the main body case 20, and there is a connecting portion or a hole in the state where the top wall 24 or the side wall 22 is not airtight. In some cases, the upper edge position of the connecting portion or hole becomes the lower end Y of the main body case 20. Further, the gap of the gap volume here means a gap connected from the lower end Y of the main body case 20, that is, a gap through which air passes, and is closed in the main body case 20, so that the volume is changed even if the internal air pressure changes. It does not include gaps that exist in a state where no change occurs.

In addition, said Formula 1 is a formula calculated | required from the following equilibrium formula (Formula 2) based on Boyle's law.
[Equation 2]
V = ((H−ΔH) / 10 + 1) (V−ΔV)
The electrical component and the drive component are arranged above the lower limit height position X that satisfies the above formula 1, in other words, by determining the shape and dimensions of the main body case 20 so as to satisfy the above formula 1, It is possible to reliably prevent the drive component from being submerged.

  Although illustration is omitted, the wiring connecting the control unit disposed in the main body case 20 and the solar cell panel 28 disposed outside the main body case 20 passes through a position lower than the lower end Y of the main body case 20. Thus, it is provided outside the main body case 20 so as to reach the solar cell panel. This facilitates maintaining the airtightness of the top wall 24 and the side wall 22 of the main body case 20. Similarly, when the wiring connecting the control unit and each sensor such as a water level sensor is provided outside the main body case 20 so as to pass through a position lower than the lower end Y of the main body case 20, it is provided so as to reach each sensor. Good.

  Furthermore, although illustration is omitted, an operation panel for driving the motor 38 manually (electrically operated manual) is provided on the outer surface of the main body case 20 or a position above the lower limit height position X in the main body case 20. You may do it. The operation panel is provided with an up button, a down button, a selection button for switching an operation mode (such as a remote mode, an automatic mode, or a manual mode) of the actuator 10. Basically, the actuator 10 is remotely operated or automatically controlled. However, the operation panel is arranged near the actuator 10 when the actuator 10 is initially set or when an abnormality occurs in the actuator 10. Used when However, instead of providing an operation panel, the actuator 10 can be manually controlled using a remote controller for short distance.

  Next, an example of the first adapter 60 for attaching the actuator 10 to the water supply device 104 will be described with reference to FIG. As shown in FIG. 6, the first adapter 60 includes a cylindrical portion 62, a bowl-shaped first connection portion 64 that protrudes outward from the upper end portion of the cylindrical portion 62, and an inward direction from the lower end portion of the cylindrical portion 62. And an annular plate-like second connection portion 66 that protrudes and has a through hole 66a at the center thereof. The first connection portion 64 is formed with a plurality of bolt holes (not shown) arranged in the circumferential direction. The second connection portion 66 is also formed with a plurality of bolt holes (not shown) arranged in the circumferential direction. The bolt hole of the second connection portion 66 may be a long hole that is long in the circumferential direction.

  As shown in FIG. 7, when the actuator 10 is attached to the water supply device 104 using the first adapter 60, the fitting portion 26 of the main body case 20 is fitted into the cylindrical portion 62 of the first adapter 60, and the first The first connection portion 64 of the adapter 60 and the bottom wall of the main body case 20 of the actuator 10 are bolted. Moreover, the 2nd connection part 66 of the 1st adapter 60, the cap 122 of the water supply apparatus 104, and the bearing 126 are bolted. At this time, the first adapter 60 and the actuator 10 can be angle-adjusted in the circumferential direction with respect to the water supply device 104 by setting the bolt holes formed in the second connection portion 66 as long holes in the circumferential direction. Further, the upper end portion of the valve shaft 128 of the water supply device 104 protrudes upward from a through hole 66 a formed in the second connection portion 66 of the first adapter 60, and enters the coupling portion 50 a of the rotating shaft 50 of the actuator 10. On the other hand, it is connected so as not to rotate.

  In the water supply apparatus 104 to which the actuator 10 is attached in this manner, for example, when the user transmits an operation instruction (control signal) indicating fully closed, fully opened, or an arbitrary opening degree to the actuator 10 using the remote operation terminal. The control unit (CPU) of the actuator 10 drives the motor 38 according to the operation instruction. The driving force of the motor 38 is transmitted to the main gear 40, and the main gear 40 rotates and the rotating shaft 50 rotates. Thereby, a rotational force is applied to the valve shaft 128 fixedly connected to the rotation shaft 50. The valve shaft 128 to which the rotational force is applied is moved up and down by a feed screw mechanism between itself and the bearing 126, and the valve body 130 is moved to the fully open position, the fully closed position, and the like. Further, the rotary shaft 50 moves up and down so as to penetrate the shaft portion 40a of the main gear 40 as the valve shaft 128 moves up and down. Thus, the vertical movement of the valve shaft 128 is absorbed without requiring a large space in the vertical direction.

  Next, an example of the second adapter 70 for attaching the actuator 10 to the drainage device 106 will be described with reference to FIG. As described above, the partition 142 of the drainage device 106 in this embodiment is only provided so as to be movable up and down, and does not move up and down even when it receives a rotational force. For this reason, the rotational force of the rotary shaft 50 of the actuator 10 needs to be converted into an axial (vertical) force and transmitted to the partition 142 of the drainage device 106. Therefore, as shown in FIG. 8, in this embodiment, a movable portion 82 that moves up and down by a screw mechanism is provided in the second adapter 70, and the rotary shaft 50 and the partition 142 are connected via the movable portion 82. I have to.

  Specifically, like the first adapter 60, the second adapter 70 includes a cylindrical portion 72, a bowl-shaped first connection portion 74 that protrudes outward from the upper end portion of the cylindrical portion 72, and the cylindrical portion 72. An annular plate-like second connection portion 76 that protrudes inward from the lower end portion and has a through hole 76a at the center thereof is provided. The bolt holes formed in the second connection portion 76 are preferably long holes in the circumferential direction.

  A cylindrical holding portion 78 is provided in the through hole 76 a of the second connection portion 76. An upper portion of a connecting shaft 80 connected to the rotating shaft 50 of the actuator 10 is rotatably inserted into the holding portion 78. Further, a male screw is formed on the outer peripheral surface of the lower portion 80a of the connecting shaft 80, and a cylindrical movable portion 82 having a female screw formed on the inner peripheral surface is screwed into the lower portion 80a of the connecting shaft 80. . The movable portion 82 is provided with a fixing portion 84 for connecting and fixing the partition 142 to the movable portion 82. In addition, on the lower surface side of the second connection portion 76, a base 86 for placing the actuator 10 on the upper end portion of the drainage basin 114 is provided. Further, a rod-like detent portion 88 for preventing the movable portion 82 from rotating (following) with the connecting shaft 80 is provided so as to connect the fixed portion 84 and the pedestal 86. In such a second adapter 70, when a rotational force around the axis is applied to the connecting shaft 80, the movable portion 82 and the fixed portion 84 move up and down by the feed screw mechanism.

  As shown in FIG. 9, when the actuator 10 is attached to the drainage device 106 using the second adapter 70, the fitting portion 26 of the main body case 20 is fitted into the cylindrical portion 72 of the second adapter 70, and the second The first connecting portion 74 of the adapter 70 and the bottom wall of the body case 20 of the actuator 10 are bolted. In addition, a pedestal 86 is attached to the upper end portion of the drainage basin 114, and the end portion of the fixing portion 84 is bolted to the partition body 142. Further, the upper end portion of the connecting shaft 80 is non-rotatably connected to the coupling portion 50a of the rotating shaft 50 of the actuator 10.

  In the drainage device 106 to which the actuator 10 is thus attached, for example, an operation instruction (control) for the user to change the height position of the drainage port (the upper end opening of the partition 142) with respect to the actuator 10 using a remote operation terminal. Signal) is transmitted, the control unit (CPU) of the actuator 10 drives the motor 38 in accordance with the operation instruction. The driving force of the motor 38 is transmitted to the main gear 40, and the main gear 40 rotates and the rotating shaft 50 rotates. Thereby, a rotational force is applied to the connecting shaft 80 of the second adapter 70 fixedly connected to the rotating shaft 50. When a rotational force around the axis is applied to the connecting shaft 80, the movable portion 82 moves up and down by a feed screw mechanism between the connecting shaft 80 and the movable portion 82, and accordingly, the partition connected and fixed to the movable portion 82. The body 142 is moved to a predetermined height position.

  As described above, in the system 100 of this embodiment, electric actuators having the same structure are attached to the water supply device 104 side and the drainage device 106 side. This is because the actuator 10 provided with a rotating shaft 50 that rotates with the main gear 40 and is slidable in the axial direction of the main gear 40 so as to penetrate the axial center of the main gear 40 is used as the electric actuator. Realized. That is, in the system 100 of this embodiment, by using the actuator 10, only the mounting adapters (the first adapter 60 and the second adapter 70) are prepared according to the water supply device 104 and the drainage device 106. An electric actuator having the same structure can be retrofitted on the 104 side and the drainage device 106 side.

  According to this embodiment, since the actuator 10 having the same structure is used on the water supply device 104 side and the drainage device 106 side, remote operation or automation of farm water management can be realized at low cost.

  Further, since the rotating shaft 50 is provided so as to penetrate the center of the main gear 40, the actuator 10 can be downsized. Therefore, the actuator 10 can be prevented from interfering with farm work.

  In the above-described embodiment, the R & R alfalfa type water supply valve is illustrated as the water supply device 104, but is not limited thereto. The water supply apparatus 104 installed in the agricultural field 102 may be various water supply apparatuses such as a ball valve, a gate valve, and a sluice gate.

  As an example, FIG. 10 shows a state where an internal threaded valve rod non-rising gate valve is used as the water supply device 104 and the actuator 10 is attached to the gate valve. Briefly described, the water supply device (gate valve) 104 shown in FIG. 10 includes a valve box 150 having a main pipe portion and an upright portion, and a rotation of a valve rod (support rod) 152 is provided in the valve box 150. A disc-shaped valve body (partition body) 154 that moves up and down is provided.

  As the 1st adapter 200 for attaching the actuator 10 to such a water supply apparatus 104, it protrudes outward from the same thing as the above-mentioned 1st adapter 60, ie, the cylindrical part 202, and the upper end part of the cylindrical part 202. One including a bowl-shaped first connection portion 204 and an annular plate-like second connection portion 206 protruding inward from the lower end portion of the cylindrical portion 202 and passing through the center portion thereof is used. And the rotating shaft 50 of the actuator 10 is connected with the upper end part of the valve rod 152 of the water supply apparatus 104 so that rotation is impossible. When a rotational force is applied to the valve stem 152 from the rotary shaft 50 of the actuator 10, the valve body 154 moves up and down by a feed screw mechanism between the valve stem 152 and the valve body 154, and the main pipe portion of the valve box 150 is moved. Opened and closed.

  10 shows a gate valve of a type that does not move up and down even when the valve stem 152 rotates. However, the water supply device 104 is a type in which the valve stem itself also moves up and down as the valve stem rotates (valve stem). An ascending gate valve may be used.

  Moreover, in the above-mentioned Example, although the 1st displacement mechanism with which the water supply apparatus 104 is provided included the valve body or partition which moves up and down with rotation of a support rod, it is not limited to this. The first displacement mechanism may include a valve body or a partition body that can be moved up and down, such as a manual sluice (water supply weir) that does not have a screw mechanism. In other words, the first displacement mechanism itself does not necessarily have a structure for converting the rotational force of the rotation shaft 50 of the actuator 10 into an axial force. In this case, as the first adapter for attaching the actuator 10 to the water supply device 104, the same adapter as the second adapter 70 shown in FIG. 8 having a movable portion that moves up and down by a screw mechanism is used. The rotary shaft 50 of the actuator 10 and the valve body or partition body of the water supply device 104 may be connected via each other.

  Furthermore, in the above-mentioned Example, although the water outlet provided with the cylindrical partition 142 is illustrated as the drainage apparatus 106, it is not limited to this. The drainage device 106 installed in the agricultural field 102 may be various drainage devices such as a gate valve and a sluice as shown in FIG.

  As an example, FIG. 11 shows a state in which a water level controller capable of setting the groundwater level in the field is used as the drainage device 106 and the actuator 10 is attached to the water level controller. Briefly described, the drainage device (water level controller) 106 shown in FIG. 11 includes an outer cylinder 160, an inner cylinder (not shown) provided in the outer cylinder 160 and having a lower end connected to an underground water supply pipe. Is provided. The inner cylinder is provided with a slide tube (partition body) 162 that can be moved up and down.

  As the 2nd adapter 210 for attaching the actuator 10 to such a drainage device 106, it is the same as the above-mentioned 2nd adapter 70, ie, the cylindrical part 212, the 1st connection part 214, the 2nd connection part 216, holding | maintenance Part 218, connecting shaft 220, movable part 222, fixed part 224, base 226 for mounting the actuator 10 on the upper end of the outer cylinder 160, and a detent for slidably connecting the inner tube and the slide tube 162. What is provided with the part 228 grade | etc., Is used. Then, the slide tube 162 of the drainage device 106 and the rotating shaft 50 of the actuator 10 are connected via the connecting shaft 220 and the movable portion 222. When a rotational force is applied from the rotary shaft 50 of the actuator 10 to the connecting shaft 220, the movable portion 222 moves up and down by a feed screw mechanism between the connecting shaft 220 and the movable portion 222, and accordingly, the movable portion 222 is connected to the movable portion 222. The fixed slide tube 162 is moved to a predetermined height position.

  Furthermore, in the above-described embodiment, the second displacement mechanism included in the drainage device 106 includes a valve body or a partition body provided so as to be movable up and down, but is not limited thereto. The second displacement mechanism may include a valve body or a partition body that moves up and down with the rotation of the support rod, like the gate valve shown in FIG. In this case, the second adapter for attaching the actuator 10 to the drainage device 106 is the same as the first adapter 60 shown in FIG. 6, and the actuator is used with respect to the support rod of the second displacement mechanism of the drainage device 106. Ten rotation shafts 50 may be connected.

  As described above, the actuator 10 can be retrofitted to various existing water supply devices 104 and drainage devices 106, and the system 100 is provided with various existing water supply devices 104 and drainage devices 106. It can correspond to the field 102.

  In the actuator 10 in the above-described embodiment, the solar cell panel 28 is attached to the top surface of the top wall 24 of the main body case 20 via the holding body 30 including the frame 30a and the support plate 30b. The shape or configuration of the holding body 30 for attaching the solar cell panel 28 to 20 can be appropriately changed.

  In addition, as shown in FIG. 12, a rectangular frame-shaped frame portion 90 is formed on the top wall 24 of the main body case 20, and the solar cell panel 28 is attached in an airtight state so as to be embedded in the top wall 24. You can also.

  Further, the solar cell panel 28 can be provided so as to be detachable and rotatable with respect to the main body case 20. For example, as shown in FIG. 13, a cylindrical attachment portion 92 extending upward is formed on the lower end portion of the side wall 22 of the main body case 20. Further, as the holding body 30 for holding the solar cell panel 28, for example, a rectangular frame-shaped frame 30a provided so as to cover the periphery of the solar cell panel 28, a support plate 30b bent at a predetermined angle, and a column 94 are fitted. What is provided with the attaching part 30c to be used is used. The cylindrical support column 94 is connected to the mounting portion 30c of the holding body 30 in an airtight state, and the lower end portion of the support column 94 is connected to the mounting portion 92 formed in the main body case 20 so as to be fitted. . At this time, an O-ring 54 is provided at a connection portion between the support column 94 and the attachment portion 92 of the main body case 20. As a result, the support column 94 and the attachment portion 92 of the main body case 20 are hermetically connected, and the support column 94 (and thus the solar cell panel 28) can be attached to and detached from the attachment portion 92 and can be rotated. Connected. In addition, you may connect the support | pillar 94 and the holding body 30 so that attachment or detachment and rotation are possible.

  Like the actuator 10 shown in FIG. 13, by making the solar cell panel 28 detachable from the main body case 20, the solar cell panel 28 can be detached from the main body case 20 and installed at another position. In addition, by making the solar cell panel 28 rotatable with respect to the main body case 20, the orientation of the solar cell panel 28 can be set in an arbitrary direction. As a result, it becomes possible to flexibly cope with the situation of the field 102 (such as the presence or absence of an obstacle), and good solar radiation can be secured.

  Further, in the actuator 10 shown in FIG. 13, the installation height of the solar panel 28 can be arbitrarily set by changing the length of the column 94 by adding a column for adjusting the length, etc. It can cope with the situation of the field 102.

  Further, in the actuator 10 shown in FIG. 13, the antenna 34 is disposed in the support column 94. In the actuator 10 shown in FIG. 3 and the like, the main body case 20 is made of a resin in consideration of the point that the manufacturing cost can be reduced and the antenna 34 can be disposed and protected in the main body case 20, but FIG. In the actuator 10 shown, if only the support column 94 is made of resin, the main body case 20 can be made of metal having excellent durability (weather resistance). However, the arrangement position of the antenna 34 can be changed as appropriate, and the main body case 20 may be made of metal as long as the antenna 34 is disposed outside the main body case 20.

  Furthermore, as a modification of the actuator 10 shown in FIG. 13, as shown in FIG. 14, as shown in FIG. 14, a concave portion that is recessed inward is formed on the side wall 22 of the main body case 20, and the mounting portion passes through the concave portion. 92 and struts 94 can also be provided. Thereby, the actuator 10 can be further downsized.

  Further, in the actuator 10 of the above-described embodiment, the wiring connecting the control unit, the solar battery panel 28, each sensor, and the like passes through a position lower than the lower end Y of the main body case 20, but is not limited thereto. . These wires may pass through holes formed in the side wall 22 or the top wall 24 of the main body case 20. In this case, it is preferable to secure an airtight structure in a portion through which the wiring passes by filling a gap between the hole and the wiring with a caulking material (sealing material). Alternatively, it is good to secure the airtight structure of the part through which the wiring passes by compressing and inserting an elastic body such as rubber made slightly larger than the gap part and filling the gap or filling with sticky butyl rubber .

  Further, in the actuator 10 of the above-described embodiment, the rotation shaft 50 rotates with the main gear 40 and can slide in the axial direction with respect to the main gear 40. Although the key groove 40c is formed on the surface and the sliding key 50b is formed on the outer peripheral surface of the rotating shaft 50, this arrangement may be reversed. That is, a sliding key may be formed on the inner peripheral surface of the shaft portion 40 a of the main gear 40 and a key groove may be formed on the outer peripheral surface of the rotating shaft 50. A plurality of sliding keys and key grooves may be formed. Furthermore, the rotating shaft 50 may be a spline, a serration, or the like.

  Furthermore, in the second adapter shown in FIG. 8 described above, when the feed screw mechanism is provided in the mounting adapter, the female screw side is moved up and down as a movable part, but the male screw side (connection shaft side) is used as a movable part. It is also possible to connect the rotary shaft 50 and the partition 142 or the like by this connecting shaft (movable part) so as to move up and down. This is the same when the feed screw mechanism is provided in the first adapter.

  Moreover, in the above-mentioned Example, although the main body case 20 was formed by combining several case member 20a, 20b, 20c, it is not limited to this. Although illustration is omitted, the side wall 22 and the top wall 24 of the main body case 20 may be integrated with no connecting portion. As a result, the side wall 22 and the top wall 24 of the main body case 20 can be more reliably formed into an airtight structure as compared with the case where the airtight structure is formed using the O-ring 54 or the like. Further, the position and number of connecting portions provided in the main body case 20 are not particularly limited. For example, the first case member 20a and the second case member 20b can be integrated with no connecting portion.

  Furthermore, in the above-described embodiment, the rotary shaft 50 of the actuator 10 is directly connected to the valve shaft 128 of the water supply device (water supply valve) 104. However, the valve shaft and the rotary shaft are connected to a shaft adapter (see FIG. (Not shown). That is, the first adapter for attaching the actuator 10 to the water supply device 104 (same for the second adapter) can also include a shaft adapter. Since the tip (upper end) shape of the valve shaft of the water supply device or drainage device varies depending on the manufacturer and the device size, a shaft adapter having a connection portion matching the tip shape of the valve shaft at the lower end portion is manufactured. The rotating shaft of the actuator 10 is attached to the valve shaft via the shaft adapter. At this time, the connecting shape of the shaft adapter and the rotating shaft is common. That is, the shape of the connecting portion of the rotating shaft may be one type.

  Furthermore, when the valve shaft and the rotary shaft are connected via the shaft adapter, an opening used for mounting or removing the shaft adapter is provided on the side surface of the mounting adapter (for example, the cylindrical portion 62 of the first adapter 60). It is good to keep. The opening may be opened and closed with a lid.

  In the above-described embodiment, the solar battery panel 28 and the storage battery 36 are provided so that the actuator 10 can be applied even in the field 102 where it is difficult to secure a commercial power source. However, other power sources such as a commercial power source can be used. When installed in the environment, the actuator 10 does not necessarily need to include the solar battery panel 28 and the storage battery 36. When another power source provided at a location different from the main body case 20 is used, the cable for connecting the other power source and the actuator 10 passes through a position lower than the lower end Y of the main body case 20 to the main body. It is preferable to be guided into the case 20.

  In addition, in this invention, "connecting via" includes the case where it connects directly and the case where it connects indirectly also through another member. The “same structure” actuator means that the basic structure is the same, and includes not only completely the same but also substantially the same.

  In addition, the specific numerical values such as dimensions and the specific shape described above are merely examples, and can be appropriately changed according to the needs of the product specifications and the like.

DESCRIPTION OF SYMBOLS 10 ... Electric actuator 20 ... Main body case 22 ... Side wall 24 ... Top wall 28 ... Solar cell panel 32 ... Control panel (control part)
34 ... Antenna 36 ... Storage battery 38 ... Motor 40 ... Main gear (gear)
40c ... Key groove 50 ... Rotating shaft 50b ... Sliding key 52 ... Thrust bearing 60, 200 ... First adapter 70, 210 ... Second adapter 100 ... Agricultural field water supply / drainage system 102 ... Agricultural field 104 ... Water supply apparatus 106 ... Drainage apparatus 128 ... Valve Shaft 130 ... Valve body 142 ... Partition

Claims (6)

A water supply device having a first displacement mechanism for controlling water supply to the field and a drainage device having a second displacement mechanism for controlling drainage from the field are used for water management of the field. A water supply / drainage system for a farm,
A first electric actuator for operating the first displacement mechanism;
A first adapter for attaching the first electric actuator to the water supply device;
A second electric actuator for operating the second displacement mechanism; and a second adapter for attaching the second electric actuator to the drainage device;
Each of the first electric actuator and the second electric actuator is
Body case,
A solar cell panel attached to the main body case,
A storage battery provided in the main body case and capable of storing electric power generated by the solar cell panel,
A motor provided in the body case and driven by the electric power;
A controller provided in the main body case for controlling driving of the motor;
A gear provided in the main body case and rotated by a driving force from the motor, and provided so as to penetrate the shaft center of the gear, rotate together with the gear, and can slide in the axial direction of the gear. A field water supply and drainage system comprising a rotating shaft. The first displacement mechanism includes a valve body or a partition body that moves up and down with rotation of the support rod,
The field water supply / drainage system according to claim 1, wherein the rotation shaft of the first electric actuator is connected to the support rod of the first displacement mechanism. The first displacement mechanism includes a valve body or a partition body provided to be movable up and down,
The first adapter includes a movable portion that moves up and down by a screw mechanism,
The field water supply / drainage according to claim 1, wherein the rotation shaft of the first electric actuator is connected to the valve body or the partition body of the first displacement mechanism via the movable portion of the first adapter. system. The second displacement mechanism includes a valve body or a partition body that moves up and down with rotation of the support rod,
The field water supply / drainage system according to any one of claims 1 to 3, wherein the rotation shaft of the second electric actuator is coupled to the support rod of the second displacement mechanism. The second displacement mechanism includes a valve body or a partition body provided to be movable up and down,
The second adapter includes a movable portion that moves up and down by a screw mechanism,
The rotating shaft of the second electric actuator is connected to the valve body or the partition body of the second displacement mechanism via the movable part of the second adapter. The water supply and drainage system for fields described in 1. The main body case has a cylindrical side wall and a top wall that seals an upper portion of the side wall,
The field supply and drainage system according to claim 1, wherein the side wall and the top wall have an airtight structure.

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