Paddy field water supply device

Abstract

To achieve semi-automation with a simple and inexpensive structure in which water supply is performed manually and water cutoff is performed automatically, which reduces a burden on farmers, and to sufficiently supply water to a paddy field without increasing a flow rate of a water channel even in a place at a low water level of a water channel like a downstream part of a water channel 1.SOLUTION: A paddy field water supplying device in which an opening / closing plate 10 for opening / closing a gate port 4 of a water channel 1 is vertically movably provided in an upright posture includes: a handle 11 that is manually moved up together with the opening / closing plate 10; an engaged part 13 provided on the handle 11 and an engagement part 14 engaged therewith; a paddy field water level meter 26 for detecting that a paddy field water level A reaches a set water level; an electromagnetic solenoid 16 for moving the engagement part by energization based on the detection, and disengaging the engagement between the engagement part and the engaged part 13; and a block 30 for securing a water level of a water channel for raising and securing a water level B of a water channel in the gate port 4.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a paddy field water supply device for supplying water from a water channel to a paddy field.

Background Art

[0002] As a type of paddy field water supply device, a gate opening facing the paddy field is provided in a part of the side wall of the water channel, and an opening / closing plate for opening and closing the gate opening is provided so as to be able to move up and down while standing upright. When the opening / closing plate is raised to open the gate opening, the water flowing in the water channel can be branched from the gate opening and taken into the paddy field (hereinafter simply referred to as "water supply"). When the opening / closing plate is lowered to close the gate opening, the water supply can be stopped (hereinafter simply referred to as "water stop") (Patent Documents 1 to 4).

[0003] In the paddy field water supply device described in Patent Document 1, an adjustment rod extending vertically is attached to the opening / closing plate. During water supply, the opening / closing plate is raised by manually pulling up the adjustment rod. A number of holes are drilled in the adjustment rod at appropriate intervals, and the opening degree of the gate opening by the opening / closing plate can be adjusted by inserting a stop pin into any of the holes and locking it to the water channel. During water stop, the stop pin is removed from the hole and the opening / closing plate is lowered.

[0004] In the paddy field water supply device described in Patent Document 2, a handle is provided on the upper part of the opening / closing plate. During water supply, the opening / closing plate is manually raised. The opening degree of the gate opening by the opening / closing plate can be adjusted by pressing the tip of the bolt against the opening / closing plate. During water stop, the bolt is loosened and the opening / closing plate is lowered.

[0005] In the paddy field water supply device described in Patent Document 3, a shaft extending vertically is attached to the opening / closing plate, a motor for raising and lowering the shaft is provided, and a water level detector is provided in the paddy field. Water supply is performed when the water level detector detects that the paddy field water level has dropped, and the motor raises the opening / closing plate. Water stop is performed when the water level detector detects that the paddy field water level has risen, and the motor lowers the opening / closing plate.

[0006] In the paddy field water supply device described in Patent Document 4, a shaft extending vertically is attached to the opening / closing plate, a motor for raising and lowering the shaft is provided, a timer for setting the water supply time at night is provided, and a paddy field water level gauge for measuring the paddy field water level is provided. Water supply is performed when the motor raises the opening / closing plate at the start of the water supply time set by the timer. Water stoppage is performed when the motor lowers the opening / closing plate at the end of the water supply time set by the timer, or even within the water supply time when the paddy field water level gauge detects that the paddy field water level has risen.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Summary of the Invention

Problems to be Solved by the Invention

[0008] The paddy field water supply devices of Patent Documents 1 and 2 have a simple structure and low cost. However, since both water supply and water stoppage need to be manually performed by the farmer approaching the device, the burden on the farmer is large. On the other hand, the paddy field water supply devices of Patent Documents 3 and 4 can perform water supply and water stoppage automatically, so the burden on the farmer can be eliminated, but the structure is complex and the cost is high.

[0009] In addition, in the paddy field water supply devices of Patent Documents 1 to 4, since the water level in the water channel is lower in the downstream part than in the upstream part, there has been a problem that sufficient water supply cannot be achieved from the gate opening in the paddy field in the downstream part. As a countermeasure, until now, the flow rate of the water channel has been increased so that the water level in the water channel is sufficiently high even in the downstream part. However, there has been a problem that a large amount of ineffective discharge occurs at the end of the water channel when doing so.

[0010] Therefore, the main object of the present invention is to realize a semi-automatic operation with a simple and low-cost structure, where water supply is manual and water stop is automatic, and to reduce the burden on farmers. A further object is to enable sufficient water supply to the paddy field without increasing the flow rate of the water channel even in a location where the water level in the water channel is low, such as in the downstream part of the water channel.

Means for Solving the Problems

[0011] [1] In a paddy field water supply device in which a gate opening facing the paddy field is provided in a part of the side wall of the water channel, and an opening / closing plate for opening and closing the gate opening is provided so as to be able to move up and down while remaining in an upright posture, when the opening / closing plate is raised to open the gate opening, water supply is performed, and when the opening / closing plate is lowered to close the gate opening, water stop is performed. A handle attached to the opening / closing plate and extending upward, which is manually raised together with the opening / closing plate, An engaged portion provided on the handle, When the handle rises, the rise is allowed, and when the rise stops, an engaging portion that engages with the engaged portion to stop the descent of the handle, A paddy field water level gauge for detecting that the paddy field water level has reached the set water level, An electromagnetic solenoid that, when energized based on the detection, moves the engaging portion to disengage the engagement between the engaging portion and the engaged portion, and enables the descent of the handle and the opening / closing plate due to their own weights. The paddy field water supply device is characterized by including this.

[0012] [2] In the invention of [1] above, the paddy field water supply device includes a battery and an opening / closing confirmation switch that turns off when the handle descends. The paddy field water level gauge includes a float switch that turns on when the paddy field water level reaches the set water level. An embodiment in which a battery, a float switch, an open / close confirmation switch, and an electromagnetic solenoid are connected in series can be exemplified as a preferred embodiment.

[0013] (Operation) (A) The start of water supply can be performed simply by a farmer manually pulling up a handle when, for example, visually recognizing that the paddy field water level is low during the daily inspection of the paddy field. This pulling-up operation can be done within a few seconds and requires little effort, so the burden on the farmer is light. (B) The start of water stoppage can be automatically performed by a paddy field water level gauge, an electromagnetic solenoid, etc. when the paddy field water level drops as described above, thus reducing the burden on the farmer. (C) Since the paddy field water supply device has a simple structure based on an engaged part, an engaging part, a paddy field water level gauge, and an electromagnetic solenoid, with switches added, it can be introduced at low cost and can be easily dealt with by simple parts replacement in case of failure or the like.

[0014] [3] In the invention of [1] or [2] above, it is preferable to include a waterway water level securing block installed at the bottom of the waterway immediately downstream of the gate opening to raise and secure the waterway water level at the gate opening.

[0015] (Operation) (D) Even in a paddy field in the downstream part where the waterway water level is lower than that in the upstream part, since the waterway water level securing block raises and secures the waterway water level at the gate opening, sufficient water supply can be provided from the gate opening. [Advantages of the Invention]

[0016] According to the paddy field water supply device of the present invention, with a simple and low-cost structure, it realizes a semi-automatic mode where water supply is manual and water stoppage is automatic, and can effectively reduce the burden on farmers. Furthermore, by including the waterway water level securing block, even in a location where the waterway water level is low, such as in the downstream part of the waterway, sufficient water supply can be provided to the paddy field without increasing the water flow rate of the waterway. [Brief Description of the Drawings]

[0017]

Figure 1

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Figure 11

DETAILED DESCRIPTION OF THE INVENTION

[0018] 1. Handle The shape of the handle is not particularly limited, but a rod shape is preferable in terms of being able to be made lightweight. The cross-sectional shape of the handle is not particularly limited, and examples thereof include a U-shaped, L-shaped, flat, square, circular shape, etc.

[0019] 2. Engaged part and engaging part The engaged part is not particularly limited, and examples thereof include a hole penetrating laterally in the handle and a recess recessed laterally. The engaging portion is not particularly limited, and examples thereof include a clawed arm provided so as to be tiltable so as to lean against the engaged portion.

[0020] 3. Block for ensuring water channel water level The shape of the block for ensuring the water channel water level is not particularly limited, and examples thereof include a horizontally laid column (the cross-section is a semi-circular shape, trapezoidal shape, triangular shape, etc.), a rectangular parallelepiped, etc. A horizontally laid column with a semi-circular cross-section is preferable in that the resistance to water flow is small and the floating garbage does not get caught because the upper surface shape is round.

[0021] The dimensions of the block for ensuring the water channel water level are not particularly limited, but those satisfying the following two conditions are preferable. Hereinafter, the direction parallel to the length direction of the water channel is simply referred to as the "flow direction", and the direction parallel to the width direction of the water channel is simply referred to as the "width direction". (1) The length in the flow direction of the block bottom surface (L in Fig. 9) shall be twice or more the block height (H in Fig. 9). (2) The block height (H) shall be 0.3 to 0.7 times the inner depth of the water channel (D in Fig. 10).

[0022] It is preferable that chamfers are formed at the corners of the bottom surface of the block for ensuring the water channel water level and each end surface in the width direction to discharge the mud on the bottom surface of the water channel downstream. Since the mud accumulates not only in the center of the bottom surface of the water channel but also near the side walls, by providing chamfers at those positions, the mud can be flowed downstream without being retained in the gap with the water channel. This chamfer also has the function of allowing the inner bottom hunch of the water channel to escape.

[0023] It is preferable that an engaged portion for engaging a lifting jig is formed on the block for ensuring the water channel water level. This makes it easier to lift the block for ensuring the water channel water level with the lifting jig, and the operations of flowing the mud accumulated around the block and changing the position of the block can be made easier. The lifting jig is not particularly limited, and examples thereof include an arm-shaped one, one using a rope or a chain, etc. The engaged portion is not particularly limited, and examples thereof include a hole, a loop, a hook, etc.

[0024] It is also preferable that a groove for fitting a raising plate extending upward from the water channel water level securing block is formed at the upper part of the water channel water level securing block. This is because the water level in the water channel at the gate opening can be further raised.

Embodiment

[0025] Next, embodiments of the present invention will be described with reference to the drawings. Note that the structure, material, shape, and dimensions of each part of the embodiment are illustrative and can be appropriately changed without departing from the spirit of the invention.

[0026] The paddy field water supply device of the embodiment shown in FIGS. 1 to 10 is provided on a part of the side wall of a water channel 1 (open water channel) made of concrete and having a U-shaped cross section. A pair of gate frames 2 spaced apart in the flow direction of the water channel 1 and a gate plate 3 disposed between the two gate frames 2 and fixed to the two gate frames 2 in a watertight manner are provided on a part of the side wall. A gate opening 4 facing the paddy field is formed in the gate plate 3. Further, an opening / closing plate 10 for opening and closing the gate opening 4 is provided so as to be able to move up and down while standing upright. When the opening / closing plate 10 is raised to open the gate opening 4, water is supplied, and when the opening / closing plate 10 is lowered to close the gate opening 4, water is stopped.

[0027] The paddy field water supply device of Embodiment 1 A handle 11 attached to the opening / closing plate 10 and extending upward and manually raised, An engaged portion 13 provided on the handle 11, When the handle 11 rises, the rising is allowed, and when the rising stops, an engaging portion 14 that engages with the engaged portion 13 to stop the descent of the handle 11, A paddy field water level gauge 26 for detecting that the paddy field water level A has reached the set water level, An electromagnetic solenoid 16 that is energized based on the detection and moves the engaging portion 14 to disengage the engaging portion 14 from the engaged portion 13, A water channel water level securing block 30 placed at the bottom of the water channel 1 immediately downstream of the gate opening 4 to raise and secure the water level B in the water channel at the gate opening 4 and is characterized by including.

[0028] The opening and closing plate 10 is arranged so as to be slidably in contact with the inner surface of the gate plate 3. The gate plate 3 is provided with a guide member 5 for vertically guiding both side edges of the gate plate 3, a lower restricting member 6 for restricting the downward limit of the opening and closing plate 10, and an upper restricting member 7 for restricting the upward limit of the opening and closing plate 10 (not shown in FIG. 1).

[0029] Above the side wall height of the gate plate 3, a standing support plate 8 is provided integrally and continuously with the gate plate 3. However, the support plate 8 may be separate from the gate plate 3. A box-shaped case 9 is attached to the upper inner side of the support plate 8. A front door is provided on the front of the case 9 so as to be openable and closable by a hinge.

[0030] The handle 11 is made of a stainless steel material with a U-shaped cross section, and a plurality of holes penetrating horizontally are formed in the middle plate of the U-shape at a predetermined interval in the vertical direction. The handle 11 is supported so as to be movable up and down by being loosely inserted into support notches 15 formed in the upper wall and the lower wall of the case 9.

[0031] The engaged portion 13 is the above-mentioned hole formed in the handle 11. Specifically, a part of the plurality of holes located inside the case 9 functions as the engaged portion 13. The engaging portion 14 is a clawed arm pivotally mounted at the lower end on the vertical wall inside the back of the case 9 and provided so as to be tiltable so as to lean against the handle 11. A claw for entering and engaging with the engaged portion 13 (hole) is formed at the upper end of the clawed arm.

[0032] When the handle 11 rises to the maximum and the opening and closing plate 10 hits the upper restricting member 7 (when the gate opening 4 is opened to the maximum), the hole of the handle 11 at the position corresponding to the claw of the engaging portion 14 is the main engaged portion 13. Also, several holes below the engaged portion 13 function as adjusting engaged portions 13 with which the claw of the engaging portion 14 engages when the handle 11 rises to the maximum position before and is stopped (when adjusting to partially open the gate opening 4). The engaged portion 13 and the engaging portion 14 of the present embodiment can be regarded as a kind of ratchet mechanism 12.

[0033] The paddy field water level gauge 26 includes a standing rod 27 that is stabbed into the paddy field and made to stand upright, a float switch 28 that is attached to the standing rod 27 so that the mounting height can be adjusted, and a protective cylinder 29 that covers these to protect them.

[0034] The electromagnetic solenoid 16 is attached to the vertical wall of the case 9, and its plunger 17 and the engaging portion 14 are coupled via a flexible power transmission device 18 that creates a play of a predetermined length in the stroke length direction of the plunger 17. The power transmission device 18 is not particularly limited, and examples thereof include a combination of a pin and a long hole, a chain, a wire, etc. The electromagnetic solenoid 16 is of a type that does not have a spring for retracting the plunger 17 by electromagnetic force when energized and extending the plunger 17 when not energized, but since the plunger 17 is attached so as to face obliquely downward, the plunger 17 extends by its own weight when not energized. Note that the electromagnetic solenoid may be of a type that includes the spring.

[0035] Furthermore, the following are provided inside the case 9. · A regulating pin 19 attached to the vertical wall to regulate the movable range of the engaging portion 14 · A main power switch 22 attached to the vertical wall and manually turned ON / OFF · A battery box 20 attached to the vertical wall and a battery 21 mounted thereon · A switch pusher 23 attached to the middle part of the handle 11 and moving up and down together with the handle 11 · An open / close confirmation switch 24 attached to the vertical wall, which is always ON and is turned OFF when pushed by the lowered switch pusher 23 · A terminal 25 (terminal block)

[0036] And the battery 21, the main power switch 22, the float switch 28, the open / close confirmation switch 24, and the electromagnetic solenoid 16 are connected in series as shown in the circuit diagram of FIG. 8 by wiring at the terminal 25. The main power switch 22 is normally ON and is turned OFF during maintenance or when not in use for a long time.

[0037] As shown in FIGS. 1, 9, and 10, the block 30 for ensuring the water level of the water channel is a horizontally laid columnar body with a semi-circular cross-section formed of concrete. The dimensions of the block 30 for ensuring the water level of the water channel satisfy the above-mentioned two conditions. Chamfers 31 are formed at the corners between the bottom surface of the block 30 for ensuring the water level of the water channel and each end surface in the width direction to discharge the mud on the bottom surface of the water channel downstream. As shown in FIG. 10, since the mud M accumulates not only at the center of the bottom surface of the water channel but also near the side walls, by providing chamfers at those positions, the mud M can flow downstream without being retained in the gap with the water channel 1. This chamfer also has the function of allowing the inner bottom hunch 40 of the water channel 1 to pass through.

[0038] Even when the mud M accumulates, the block 30 for ensuring the water level of the water channel is lifted to let the mud M flow downstream. At this time, since a hole is formed in the block 30 for ensuring the water level of the water channel as the engaged portion 32, the block 30 for ensuring the water level of the water channel can be easily lifted by the lifting jig 33 engaged with the engaged portion 32.

[0039] FIGS. 3 and 8(a) show the paddy field water supply device and the circuit diagram in the initial state. In FIGS. 3 to 7, in order to make it easier to see the engagement state between the engaged portion 13 and the engaging portion 14, the cross-section of the handle 11 is shown. At this time, the opening / closing plate 10 descends together with the handle 11 to close the gate opening 4. The opening / closing confirmation switch 24 is pushed by the switch pusher 23 that descends together with the handle 11 and is turned off. The float switch 28 of the paddy field water level gauge 26 is adjusted in position to the set water level of the previously set paddy field water level A. However, at this time, the paddy field water level A is low and has not reached the float switch 28, so it is assumed that the float switch 28 is turned off. Since the electromagnetic solenoid 16 is not energized, the plunger 17 extends by its own weight, and through the power transmission device 18 that exceeds the play, the engaging portion 14 (arm with claws) is allowed to tilt by its own weight so as to lean against the handle 11.

[0040] Figs. 4 and 8(b) show the paddy field water supply device and the circuit diagram when starting water supply. When the farmer manually pulls up the handle 11, the opening and closing plate 10 is lifted together with the handle 11, and the gate opening 4 begins to open. As the switch pusher 23 rises together with the handle 11, the opening / closing confirmation switch 24 is no longer pressed, and the opening / closing confirmation switch 24 turns ON. However, since the float switch 28 is OFF, the state of the electromagnetic solenoid 16 remains unchanged. During the upward movement of the handle 11, the engaging portion 14 jumps over between the holes of the handle 11 so as to allow the upward movement. At this time, the engaging portion 14 approaches the electromagnetic solenoid 16 in the above state, but the approach is absorbed by the play created by the power transmission device 18.

[0041] Fig. 5 shows the paddy field water supply device when water is being supplied. The circuit diagram remains as in Fig. 8(b). Since the manual upward movement of the handle 11 is completed and stopped, the engaging portion 14 enters and engages with the engaged portion 13 by its own weight, stopping and locking the downward movement of the handle 11. Since the opening and closing plate 10 opens the gate opening 4, water is supplied from the water channel to the paddy field. As described above, by appropriately selecting whether to raise the handle 11 to the maximum or just before that, the engaged portion 13 with which the engaging portion 14 engages can be changed, and the degree to which the gate opening 4 opens can also be adjusted. When this adjustment is not necessary, the engaged portion 13 only needs to be the main engaged portion 13 (hole) described above.

[0042] Figs. 6 and 8(c) show the paddy field water supply device and the circuit diagram when starting water stoppage. When the paddy field water level A rises due to the above water supply and reaches the float switch 28 of the paddy field water level gauge 26, the float switch 28 turns ON. For the first time at this time, the electromagnetic solenoid 16 is energized, the plunger 17 retracts, and through the power transmission device 18, the engaging portion 14 is tilted away from the handle 11 to disengage from the engaged portion 13. At this time, the regulating pin 19 properly regulates the movable range of the engaging portion 14 to prevent the engaging portion 14 from running wild. By disengaging in this way, the handle 11 and the opening and closing plate 10 begin to descend due to their own weight.

[0043] Figs. 7 and 8(d) show the paddy field water supply device and the circuit diagram when water is stopped. Since the lowering of the handle 11 is completed, the opening / closing confirmation switch 24 is pushed by the switch pusher 23 that is lowering together with the handle 11 and is in the OFF state. Since the electromagnetic solenoid 16 is not energized, the plunger 17 extends by its own weight. When the paddy field water level A drops from this state, it returns to the state of Fig. 3.

[0044] According to the paddy field water supply device configured as described above, the following operational effects can be obtained. (a) The start of water supply can be carried out simply by the farmer manually pulling up the handle 11, for example, during the daily inspection of the paddy field. The pulling-up operation can be completed in a few seconds and requires almost no effort, so the burden on the farmer is light. (b) The start of water stoppage can be automatically carried out by the paddy field water level gauge 26, the electromagnetic solenoid 16, etc. when the paddy field water level A drops as described above, so the burden on the farmer can be reduced. (c) The paddy field water supply device has a simple structure based on the engaged part 13, the engaging part 14, the paddy field water level gauge 26, and the electromagnetic solenoid 16, plus switches, so it can be introduced at low cost and can be easily dealt with by simply replacing parts in case of failure or the like.

[0045] (d) Even in a paddy field in the downstream part where the water channel water level B is lower than that in the upstream part, since the water channel water level securing block 30 raises the water channel water level B at the gate opening 4 to secure it, sufficient water supply can be achieved from the gate opening 4. (e) Since the engaged portion 32 for engaging the lifting jig 33 is formed on the water channel water level securing block 30, it becomes easier to lift the water channel water level securing block 30 by the lifting jig 33, and the work of flowing the mud accumulated around the block or changing the block position can be made easier.

[0046] The detailed reason for making the water supply semi-automatic, i.e., manual for water supply and automatic for water stoppage, as described above is as follows. (1) During the period when labor is required for water management, the start of water supply cannot be entrusted to a machine. In the open water channel (different from the pipeline), a certain amount of water is constantly flowing, and the amount of water diverted to the paddy fields upstream is subtracted and then flows downstream. The water supply to the upstream farmers affects the water supply to the downstream farmers. Especially when the amount of water that can flow into the water channel is small, that is, when water conservation is necessary, the impact on the downstream farmers is significant. Therefore, the upstream farmers must consider the downstream and supply water while looking at the flow rate of the water channel. Both the water and the water channel are the shared property of the upstream and downstream farmers. It is impossible to obtain the understanding of the downstream farmers if the upstream farmers supply water arbitrarily with machines. Therefore, when water conservation is necessary, that is, during the period when a great deal of labor is required for careful water management, the automatic water supply start device cannot be activated.

[0047] (2) Even if the water supply start operation is manual, the farming work time does not increase significantly. Even if water management is automated, farmers still go to the fields every day or every other day to check the condition of the rice. Then, if the water supply start operation is performed manually, it can be done in a short time. In the case of this paddy field water supply device, it is an operation of pulling up the handle for only a few seconds. (In the case of a device equipped with an automatic water supply start function with an electronic circuit and a drive motor, about 5 to 10 minutes are required for manual operation.)

[0048] (3) To automate the water supply start, it becomes a complex machine that requires a motor, gears, a battery, a solar panel, and a control circuit. Therefore, it becomes expensive, and the risk of failure also increases.

[0049] (4) It is considered that few farmers will introduce a device equipped with an automatic water supply start function that requires a large amount of funds, cannot be used when it is most needed, does not result in a significant reduction in labor time even if used, and has a risk of failure.

[0050] (5) In the open water channel, since the upstream water supply affects the downstream water supply, the upstream farmers supply water considering the water channel flow rate and the farming situation downstream. However, this is impossible with machines. Especially when careful water management is required, it is when the water channel flow rate is low and the impact on the downstream is large. Therefore, automatic water supply start without considering the surrounding situation is not acceptable in the local community. When farmers pull up the handle of the sluice gate during a field tour to check the growth status of rice, etc., the additional labor time for starting water supply is less. Thus, starting water supply by machine may cause social problems, and even if farmers perform the water supply start operation on-site, it does not require much additional effort. Therefore, this paddy field water supply device is a semi-automatic water supply machine that automatically performs only water supply stop, which is directly related to water conservation and labor reduction.

[0051] Next, in the modification example of the water channel water level securing block 30 shown in FIG. 11, a groove 34 for fitting a raised plate 35 extending upward above the water channel water level securing block 30 is formed at the upper part of the water channel water level securing block 30. According to this modification example, the water channel water level B at the gate opening 4 can be further raised.

[0052] Note that the present invention is not limited to the above-described embodiments, and can be appropriately modified and embodied without departing from the spirit of the invention.

Explanation of Reference Numerals

[0053] 1 Water channel 2 Gate frame 3 Gate plate 4 Gate opening 8 Support plate 9 Case 10 Sluice gate 11 Handle 12 Ratchet mechanism 13 Engaged portion 14 Engaging portion 16 Electromagnetic solenoid 17 Plunger 21 Battery 22 Main power switch 24 Opening / closing confirmation switch 26 Paddy field water level gauge 28 Float switch 30 Block for ensuring water level in water channel 31 Chamfer 32 Engaging portion 33 Lifting jig 34 Groove 35 Raising plate A Paddy field water level B Water channel water level M Mud

Claims

1. In a paddy field water supply device in which a gate opening facing a paddy field is provided in a part of a side wall of a water channel, an opening and closing plate for opening and closing the gate opening is provided so as to be movable up and down while remaining in an upright posture, and water is supplied when the opening and closing plate is raised to open the gate opening, and water is stopped when the opening and closing plate is lowered to close the gate opening, a handle (11) attached to the opening and closing plate (10) and extending upward to be manually raised together with the opening and closing plate (10); an engaged portion (13) provided on the handle (11); an engaging portion (14) that allows the handle (11) to rise when the handle (11) rises and engages with the engaged portion (13) to stop the descent of the handle (11) when the rise stops; a paddy field water level gauge (26) for detecting that the paddy field water level (A) has reached a set water level; and an electromagnetic solenoid (16) that, when energized based on the detection, moves the engaging portion (14) to disengage the engaging portion (14) from the engaged portion (13) and allows the handle (11) and the opening and closing plate (10) to descend due to their own weights. The paddy field water supply device is characterized by including this.

2. The paddy field water supply device includes a battery (21) and an opening / closing confirmation switch (24) that turns off when the handle (11) descends, the paddy field water level gauge (26) includes a float switch (28) that turns on when the paddy field water level (A) reaches a set water level, The paddy field water supply device according to claim 1, wherein the battery (21), the float switch (28), the opening / closing confirmation switch (24), and the electromagnetic solenoid (16) are connected in series.

3. The paddy field water supply device according to claim 1 or 2, including a water channel water level securing block (30) installed at the bottom of the water channel immediately downstream of the gate opening (4) to raise and secure the water channel water level (B) at the gate opening (4).

4. The paddy field water supply device according to claim 3, wherein the water channel water level securing block (30) is a columnar body with a horizontally laid semi-circular cross-section.

5. The paddy field water supply device according to claim 3 or 4, wherein chamfers (31) are formed at the corners of the bottom surface and the end surface in the width direction of the water channel water level securing block (30) to allow the inner bottom hunch of the water channel to escape and for drainage.

6. The paddy field water supply device according to claim 3, 4, or 5, wherein an engaged portion (32) for engaging a lifting jig (33) is formed on the water channel water level securing block (30).

7. The paddy field water supply device according to claim 3, 4, 5, or 6, wherein a groove (34) for fitting a raising plate (35) extending upward from the water channel water level securing block (30) is formed at the upper part of the water channel water level securing block (30).

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