JP3957212B2 - Actuator for rolling gate equipment - Google Patents

Description

  The present invention relates to an operating device for an undulating gate facility that automatically undulates a gate installed across a waterway such as a river according to a set water level.

  The undulating gate equipment that undulates the gate installed across the waterway is installed mainly for storing water upstream of the gate equipment, and its opening and closing methods are hydraulic, wire type, etc. Yes. In general, in the gate facility, when the upstream water level exceeds a certain level, the mechanism that has been held upright by the float device etc. is released to avoid the overflow of the river water, and the mechanism automatically operates for overturning. Is adopted.

For example, in Patent Document 1, in a lock gate and lock pipe gate provided in a river, a dike, etc., it is installed in a hinged manner on the lower floor of the waterway, and is automatically powered by the fluctuation of the river water level and automatically. Floating type undulating gate equipment with an actuating device for preventing backflow comprising a floating type undulating gate that rises and inclines so as to open or close the water flow cross section is described.
JP 2001-159126 A

  In the conventional operation device for undulating gate facilities, when the gate is automatically lowered and erected, the water level gauge measures the upstream and downstream water levels of the gate and starts the erection operation based on this water level information. Although an electrical automation system is implemented, the control device is complicated and advanced, the maintenance cost of each device is expensive, and the use of electrical circuits responds to power outages in the event of a disaster. There was a problem that was difficult.

  In recent years, as part of river water purification facilities, or in facilities intended to remove sediments in rivers, etc., the system can stand up automatically and stably at regular time intervals or according to river water level conditions. There is now a need for a undulating gate facility that can carry out lodging. In addition, in order to facilitate long-term maintenance of facilities, there is a need to develop automated mechanisms that do not require equipment that is complicated and difficult to manage, or that requires periodic repairs and parts replacement. .

  Thus, the present invention provides an operating device for a undulating gate facility that can automatically and stably perform automatic standing and overturning of a gate by a simple mechanism and can maintain and manage the facility for a long period of time. is there.

The present invention crosses a water channel, stands up with respect to the direction of water flow by driving the gate drive shaft, and stores up and down to store water , a gate drive device that drives the gate drive shaft, and water from the water channel In the operating device of the undulating gate facility in which a water channel and a gate driving device room are arranged through the side wall of the channel provided with a water intake port and a drain port for discharging water to the water channel, the gate of the gate driving device room The drive device includes a drive arm in which the gate drive shaft extending through the water channel side wall and extending into the gate drive device chamber is driven to rotate by a hydraulic cylinder, and a float arm that supports the drive float that moves up and down by the water level in the gate drive device chamber. The rotational drive force of the drive arm and the rotational drive force of the float drive shaft are coupled to the float drive shaft that is rotationally driven by raising and lowering the drive float. Reached is coupled to raising and lowering operation of the gate, the said drain outlet, the drain open mouth drain pipe on-off valve is provided in a state where the gate by the float arm and linked off valve actuating rod is fully laid down And the hydraulic cylinder is connected to a lowering hydraulic circuit that drives the hydraulic cylinder in a contracting direction to fall the gate , and an upright hydraulic circuit that drives the hydraulic cylinder in the extending direction to stand the gate, The lodging hydraulic circuit has a first switching valve that communicates with the hydraulic cylinder to operate the gate in a direction to collapse when the upper limit water level detection float rises and exceeds the upper water level, and the standing hydraulic circuit detects the lower limit water level Has a second switching valve that communicates with the hydraulic cylinder to actuate the gate to stand when the float falls below the lower water level And wherein the are.

  According to the present invention, when the water level in the gate driving device chamber is below a certain level due to the water level state of the water channel, the gate is erected by the weight of the float, and when the water level in the gate driving device chamber is above a certain level, the gate is overlaid. It is possible to automatically and stably perform the automatic standing and overturning of the gate by a simple mechanism and to maintain and manage the facility for a long time.

  Embodiments of the present invention will be described with reference to the drawings.

  1A and 1B are perspective views showing the arrangement of the gate equipment of the present invention, in which FIG. 1A shows a state where the gate 3 is standing, and FIG. 1B shows a state where the gate 3 is lying down.

  The gate 3 is installed across the water channel 1, stands up with respect to the water flow direction a, stores water upstream of the gate 3, falls down, and opens the water channel. Side watertight rubber 3 a is attached to both sides of the gate 3, and lower watertight rubber 3 b is attached to the lower part, and both sides and lower part of the gate 3 are stopped. When the gate 3 is standing and lying down, the side water-tight rubber 3a slides on the side door hardware 4 to stop water.

  A gate drive device chamber 2 (FIG. 2) is installed on the side of the water channel 1 through a water channel side wall 2b, and is usually covered with a cover 2a to prevent entry of foreign matter.

  On the upstream side of the gate 3, a water intake 18 for taking water from the water channel 1 by a float chamber water injection pipe penetrating from the side of the water channel 1 to the gate driving device chamber 2 is provided. Is poured into the gate drive unit chamber 2. Reference numeral 18 a denotes a water intake fitting installed in the water intake 18. Reference numeral 39 denotes a hydraulic operation unit.

  2A and 2B are perspective views showing an outline of the gate equipment of the present invention. FIG. 2A shows an installation state of each device in the water channel 1 and the gate drive device chamber 2, and FIG. 2B shows a drive arm 7 and a hydraulic cylinder 8. The arrangement of

  3A is a cross-sectional view of the gate facility as viewed from the downstream side of the water channel, FIG. 3B shows the arrangement of the gate 3, the driving arm 7 and the hydraulic cylinder 8, and FIG. 3C shows the arrangement of the gate 3 and the driving float 13. Indicates.

  4A is a perspective view showing an outline of the gate facility, and FIG. 4B is a perspective view showing an outline of the drain pipe on / off valve 20 of the float chamber drain pipe 19.

  As shown in FIGS. 2 and 3, the gate drive shaft 6 fixedly attached to the gate 3 penetrates the water channel side wall 2 b and is fixedly attached to the drive arm 7 in the gate drive device chamber 2. The double rod type hydraulic cylinder 8 is swingably mounted by a cylinder bearing 9. The hydraulic cylinder 8 and the drive arm 7 are connected by a cylinder pin 8a.

  As shown in FIG. 2B, the gate drive shaft 6 and the float drive shaft 11 are concentrically connected by a shaft coupling metal 10 so that the drive force can be transmitted.

  In FIG. 3B, when the hydraulic cylinder 8 is extended, the drive arm 7 is rotated downward, the gate drive shaft 6 is rotated, and the gate 3 is erected. On the contrary, when the hydraulic cylinder 8 is contracted, the drive arm 7 is rotated upward, the gate drive shaft 6 is rotated, and the gate 3 is tilted.

  When the hydraulic cylinder 8 is switched to a state where it can be freely expanded and contracted by an external force, the hydraulic cylinder 8 is extended when the gate 3 is erected, and the hydraulic cylinder 8 is contracted when the gate 3 is laid down.

  As shown in FIGS. 3 (c) and 4 (a), two float arms 12 are fixedly attached to the float drive shaft 11, and a drive float 13 is attached to the tip of the float arm 12 as a float connection pin 13a. Are connected by

  The drive float 13 has a center of gravity below the connection position by the float connection pin 13a, and is constructed so that the buoyancy center is above the connection position in water, regardless of the operating state of the float arm 12. , So that it can always maintain a horizontal state.

  The drive float 13 is constructed to have a drainage volume corresponding to the amount of water that is slightly higher than its own weight. Therefore, the float arm 12 is rotated in the upright direction when the buoyancy exceeds the dead weight when the gate drive device chamber 2 has water, and the float arm 12 is lowered by the dead weight when the gate drive device chamber 2 has no water. To generate a force to rotate.

  As shown in FIG. 3C, the gate 3 and the float arm 12 are installed with an internal angle of 90 degrees or more. When the float arm 12 falls down due to the weight of the driving float 13, the gate 3 comes to stand up. ing.

  As shown in FIGS. 2B and 4B, the drain pipe 19 in the chamber of the gate driving device chamber 2 is installed so that the water in the gate driving device chamber 2 can be drained to the water channel side. A drain pipe opening / closing valve 20 is attached to the second drain port 20a. The drain pipe opening / closing valve 20 is connected to the float arm 12 by an opening / closing valve operating rod 21, and has a mechanism that opens and closes by rotating the float arm 12.

  As shown in FIG. 3A, the gate 3 is rotatably supported by a gate support 3c. Further, the bearing hardware 14 that supports the gate support 3 c, the gate drive shaft 6, and the float drive shaft 11 is accurately fixed on the mechanical mount hardware 5 with reference to the rotation center of the gate 3. The machine mount hardware 5 is embedded and installed in the civil engineering structure.

  FIGS. 5A to 5C are perspective views showing the operating state of the gate equipment.

  In the state where the gate 3 shown in FIG. 5A is standing, the hydraulic cylinder 8 is in the extended state, the float arm 12 is in the lying down state, the drive float 13 is in the lowest position, and the on-off valve 20 closes the drain port 20a. ing.

  In the state where the gate 3 shown in FIG. 5B is in an intermediate standing state, the rotation operation of the gate 3 is transmitted by the gate drive shaft 6 and the float drive shaft 11, and the drive arm 7 and the float arm 12 are rotated. As a result, the drive float 13 is lifted, and the hydraulic cylinder 8 is contracted.

  In the state where the gate 3 shown in FIG. 5 (c) is completely lying down, the float arm 12 stands up, the drive float 13 is lifted to the maximum height, and simultaneously connected by the float arm 12 and the on-off valve operating rod 21. The drainage pipe opening / closing valve 20 thus opened is opened and the drainage port 21 is opened.

  FIG. 6 is a diagram showing a hydraulic circuit for controlling the hydraulic cylinder 8. In the figure, 8b is a hydraulic cylinder front oil chamber, 8c is a rear oil chamber of the hydraulic cylinder, 30 is a first switching valve, 31 is a second switching valve, 32 is a switching valve operating lever, 33 is a check valve, and 34 is a check valve. A flow rate adjusting valve, 35 is an automatic circuit switching valve, 36 is a relief valve, 37 is a directional control valve, 38 is a hydraulic pump, and 39 indicates a hydraulic operation unit.

  The water level symbol A1 indicates the upper limit water level in the gate driving device chamber 2, and the water level symbol A2 indicates the lower limit water level in the gate driving device chamber 2. An arrow A indicates the extending direction of the hydraulic cylinder 8, and an arrow C indicates the contracting direction of the hydraulic cylinder 8.

  A hydraulic circuit constituted by the first switching valve 30 connected to the upper limit water level detection float 15, the flow rate adjusting valve 34, and the check valve 33 is a lodging hydraulic circuit.

  The hydraulic circuit constituted by the second switching valve 31 connected to the lower limit water level detection float 16, the flow rate adjustment valve 34, and the check valve 33 is a standing operation hydraulic circuit.

  By opening the automatic circuit switching valve 35 in the operation unit 39, the lodging hydraulic circuit and the standing hydraulic circuit are opened, and the automatic opening / closing operation is executed by the operation of the upper limit water level detection float 15 and the lower limit water level detection float 16. be able to.

  When the automatic circuit switching valve 35 in the operation unit 39 is closed, the lodging hydraulic circuit and the standing hydraulic circuit are closed, and the hydraulic cylinder 8 is expanded and contracted by operating the hydraulic pump 38 and the directional valve 37, and the gate 3 is raised. , Or can be operated in a lying manner.

  In addition, when the gate 3 is in the standing state and the external pressure more than expected is generated in the gate 3, the pressure oil is released by the relief valve 36, and the gate 3 is allowed to fall down.

  FIGS. 7A to 7C are explanatory diagrams of a hydraulic circuit for automatic overturning operation. In FIG. 7, the water level symbol A is the water level in the gate drive device chamber 2, the arrow D is the upward operation direction of the upper limit water level detection float 15, the arrow O is the operation direction of the first switching valve 30 (valve opening), Indicates the flow direction of hydraulic oil in the hydraulic circuit (hydraulic cylinder contraction direction), arrow key indicates the lowering operation direction of the upper limit water level detection float 15, and arrow mark indicates the operation direction (valve closing) of the first switching valve 30.

  As shown in FIG. 7A, the first switching valve 30 is closed until the water level in the gate driving device chamber reaches the upper limit water level A1, and when the water level in the gate driving device chamber exceeds the upper limit water level A1, As shown in FIG. 7B, the first switching valve 30 is opened. That is, as shown in FIG. 7 (b), when the water level in the gate driving device chamber exceeds the upper limit water level A1, the upper limit water level detection float 15 rises in the direction indicated by the arrow D, and the switching valve operating lever via the float rod 17 32 is moved, the 1st switching valve 30 is open | released, and a hydraulic circuit is made into a communication state.

  When the first switching valve 30 is opened, the non-return valve 33 allows the hydraulic oil to flow only in the direction of the arrow F. This is because the hydraulic oil flows from the rear oil chamber 8c of the hydraulic cylinder 8 to the front oil chamber 8b. Since it becomes a flow, the hydraulic cylinder 8 can only be contracted.

  When the contraction operation of the hydraulic cylinder 8 becomes free, as described with reference to FIG. 3 above, when the contraction operation of the hydraulic cylinder 8 becomes free, the drive arm 7 can stand up and the gate 3 can automatically fall down.

  As shown in FIG. 7C, when the water level A in the gate driving device chamber falls below the upper limit water level A1 above a certain level, the upper limit water level detection float 15 descends in the direction indicated by the arrow K, and the switching valve is connected via the float rod 17. By moving the operating lever 32 and moving the first switching valve 30 in the direction indicated by the arrow K to close the hydraulic circuit, the free compression operation of the hydraulic cylinder 8 is controlled.

  FIGS. 8A to 8C are explanatory diagrams of a hydraulic circuit for automatic standing operation. In FIG. 8, the arrow indicates the lowering operation direction of the upper limit water level detection float 16, the arrow C indicates the operation direction of the second switching valve 31 (valve opening), and the arrow S indicates the flow direction of the hydraulic oil in the hydraulic circuit (cylinder extension). Direction), the arrow S indicates the upward operation direction of the upper limit water level detection float 16, and the arrow indicates the operation direction (valve closing) of the second switching valve 31.

  As shown in FIG. 8A, the second switching valve 31 is closed until the water level in the gate driving device chamber reaches the lower limit water level A2.

  As shown in FIG. 8 (b), when the water level A in the gate driving device chamber falls below the lower limit water level A 2, the lower limit water level detection float 16 descends in the direction indicated by the arrow and the switching valve operating lever 32 is connected via the float rod 17. Moves the second switching valve 31 in the direction of the arrow C to open it, and puts the hydraulic circuit in a communicating state.

  When the second switching valve 31 is opened, the non-return valve 33 allows hydraulic oil to flow only in the direction of the arrow S. This is because the hydraulic oil from the front oil chamber 8b of the hydraulic cylinder 8 to the rear oil of the hydraulic cylinder. Since the hydraulic oil flows into the chamber 8c, the hydraulic cylinder 8 can only extend.

  As described with reference to FIG. 3A, when the hydraulic cylinder 8 can be freely extended, the drive arm 7 can fall down and the gate 3 can be automatically erected.

  As shown in FIG. 8 (c), when the water level A in the gate drive device chamber 2 rises above the lower limit water level A2 by more than a certain level, the lower limit water level detection float 16 rises in the direction indicated by the arrow S and passes through the float rod 17. Then, the switching valve operating lever 32 moves and closes the second switching valve 31 in the direction of the arrow to close the hydraulic circuit, so that the free extending operation state of the hydraulic cylinder 8 is stopped.

  Since the gate facility is a balance gate that automatically operates based on the weight of each device, the water pressure generated by the water in the water channel, and buoyancy, the relational expression of each operating force that enables reliable automatic standing and lying down operation will be described with reference to FIG. To do.

  FIG. 9A is an explanatory diagram of the operating force in the automatic standing state, in which the arrow C acts in the gate collapse direction (or the direction of the force resisting the standing operation of the gate 3), and the arrow H is the driving float 13. The direction of the force acting in the gate standing direction due to the weight of the cylinder, and the arrow F indicate the direction of the force resisting the extension operation of the hydraulic cylinder 8.

  FIG. 9B is an explanatory diagram of the operating force in the automatic lying down state. In the figure, the arrow indicates the direction of the force acting in the gate falling direction, the arrow H indicates the direction of the force resisting the gate falling action, and the arrow N indicates the direction of the force acting in the gate collapse direction due to the buoyancy of the driving float 13, and the arrow D indicates the direction of the force resisting the contraction operation of the hydraulic cylinder 8. Here, each moment value is defined as follows.

M1: Moment value in the lodging direction according to the weight characteristic value of the gate
M2-U: Moment value due to assumed hydraulic load during automatic standing operation
M2-D: Moment value due to assumed hydraulic load during automatic overturning operation
M3-U: Resistance moment value due to sliding resistance of watertight rubber / bearing part due to gate operation during automatic standing operation
M3-D: Resistance moment value due to sliding resistance of watertight rubber / bearing part due to gate operation during automatic overturning operation
M4-U: Hydraulic cylinder expansion / contraction operating resistance during automatic standing operation and resistance moment value due to operating resistance of drive arm
M4-D: Hydraulic cylinder expansion / contraction action resistance during automatic overturning action and resistance moment value due to actuation resistance of drive arm
M5: Float for driving (in dewatering state of float chamber) and moment value in the gate standing direction due to the weight of the float arm
M6: Specified as the moment value in the gate collapse direction due to the buoyancy of the driving float (in the float chamber dewatered state).

  In FIG. 9A, the force acting in the direction of arrow C is M1, M2-U, M3-U, the force acting in the direction of F is M4-U, and the force acting in the direction of arrow H is M5. . As is clear from FIG. 9 (a), in order to perform the automatic standing operation, the force acting in the direction of the arrow H must be larger than the sum of the forces acting in the direction of the arrow C.

  In FIG. 9B, the force acting in the direction of the arrow is M1, M2-D, the force acting in the direction of the arrow N is M6, the force acting in the direction of the arrow H is M3-D, and the arrow D The force acting in the direction of is M4-D. As is clear from FIG. 9 (b), in order to perform the automatic collapse operation, the sum of the forces acting in the direction of the arrow must be greater than the sum of the forces acting in the direction of the arrows E and D. Don't be.

As described above, when the gate is automatically erected, the force acting in the direction of arrow H must be greater than the sum of the forces acting in the direction of arrow C. Therefore,
│M1 + M2u + M3 + M4u│ <│M5│ (Condition 1)
Must.

As described above, the sum of the forces acting on the arrow in the direction of the arrow must be larger than the sum of the forces acting on the arrows e and d when the gate automatically collapses. Therefore,
│M1 + M2d + M6│> │M3 + M4d│ (Condition 2)
Must.

  From the above, it is possible to execute the automatic standing / falling operation by the driving float 13 having the weight satisfying the above-described conditional expressions M5 and M6 and the amount of drainage in water.

  Based on the above description, the operation explanatory diagram of the outline of the automatic operation of the gate shown in FIGS. 10 and 11 will be described.

  When the gate 3 shown in FIG. 10A stands up and the upstream side of the gate 3 in the water channel 1 is in the water storage state, the water in the water channel 1 flows into the gate driving device chamber 2 from the intake port 18. If A1 has not been reached, the hydraulic circuit is closed and the gate 3 remains upright.

  As shown in FIG. 10 (b), the water level in the water channel 1 rises, and the water level in the gate drive device chamber becomes the same as that in the water channel 1 due to the water flowing in through the water intake 18.

  In the gate driving device chamber shown in FIG. 10C in the state of FIG. 10B, the gate 3 is standing up, so that the driving float 13 is underwater and buoyancy is generated. When the water level A in the gate drive unit chamber exceeds the set upper limit water level A1, the first switching valve 30 of the hydraulic circuit that automatically operates as described above with reference to FIG. Is in a state in which the contraction operation is free, and at the same time, the condition of the conditional expression 2 is satisfied by the rise of the water level in the gate drive device chamber 2, the drive float 13 starts to rise, and the gate 3 starts the automatic collapse operation.

  When the gate 3 shown in FIG. 10D is in a completely lying state, the drain pipe opening / closing valve 20 in the gate driving device chamber is opened as described with reference to FIG. 5C, and the water in the gate driving device chamber 2 is opened. Is drained through the drain pipe 19 into the water channel 1 through the drain port 19a.

  As shown in FIG. 11 (a), the water level of the water channel 1 is lowered, and as shown in FIG. 11 (b), when the water level A in the gate driving device chamber 2 is lower than the lower limit water level A2, FIG. As described above, when the lower limit water level detection float 16 is operated, the second switching valve 31 is switched from the closed state to the opened state, so that the hydraulic cylinder 8 is free to extend. The conditions shown are satisfied, and the gate 3 performs an automatic standing operation by lowering due to the weight of the driving float 13.

  When the gate 3 completes the automatic standing operation and the driving float 13 is lowered to the lowest position, the drain pipe opening / closing valve 20 closes the drain port 21a, and water can be stored in the gate driving device chamber.

  As shown in FIG. 11 (c), the water level of the water channel 1 rises due to the standing gate 3, and the standing state is maintained until the water level in the gate driving device chamber reaches the upper limit water level A1.

  If the water level in the water channel 1 does not drop due to a flood or the like, the water level in the gate drive device room also does not drop, so the gate 3 maintains a completely lying state and keeps the water channel 1 in an appropriate safe state.

  In addition, the water level height of the upper limit water level A1 in the gate drive device chamber is set to about the standing height of the gate 3, and the water flow cross section of the intake port 18 is adjusted to adjust the water level rise time in the gate drive device chamber 2. It is possible to execute automatic lodging / automatic standing operation at regular intervals.

  INDUSTRIAL APPLICABILITY The present invention can be used for an undulating gate facility that automatically undulates a gate according to a set water level.

It is a perspective view which shows arrangement | positioning of the gate installation of this invention, (a) shows the state in which the gate 3 is standing, (b) shows the state in which the gate 3 is lying down. In addition, the arrow a in the figure indicates the water flow direction of the water channel. It is a perspective view which shows the outline | summary of the gate installation of this invention, (a) shows the installation state of each apparatus in the water channel 1 and the gate drive device room | chamber 2, (b) shows the drive arm 7 and the hydraulic cylinder 8. FIG. (A) is a sectional view of the gate facility as viewed from the downstream direction of the water channel, (b) shows the arrangement of the gate 3, the drive arm 7, and the hydraulic cylinder 8, (c) shows the arrangement of the gate 3 and the driving float 13. . (A) is a perspective view which shows the outline | summary of a gate installation, (b) is a perspective view which shows the outline | summary of the drain pipe on-off valve 20 of the drain pipe 19. FIG. It is a perspective view which shows the operating state of a gate installation. 2 is a diagram illustrating a hydraulic circuit that controls a hydraulic cylinder 8. FIG. It is explanatory drawing of the hydraulic circuit of an automatic lodging action. It is explanatory drawing of the hydraulic circuit of automatic standing operation. (A) is an operation force explanatory diagram at the time of automatic standing operation, and (b) is an operation force explanatory diagram at the time of automatic lying down operation. It is operation | movement explanatory drawing which shows the outline | summary of the automatic lodging operation | movement of a gate. It is operation | movement explanatory drawing which shows the outline | summary of the automatic standing operation of a gate.

Explanation of symbols

1: Water channel, 2: Gate drive unit room, 2a: Cover, 2b: Water channel side wall, 3: Gate, 3a: Side watertight rubber, 3b: Bottom watertight rubber, 3c: Gate support metal, 4: Side door metal 5: mechanical mount hardware, 6: drive shaft, 7: drive arm, 8: hydraulic cylinder, 8a: cylinder pin, 8b: front oil chamber of hydraulic cylinder, 8c: rear oil chamber of hydraulic cylinder, 9: cylinder bearing, 10: Shaft coupling hardware, 11: Float drive shaft, 12: Float arm, 13: Drive float, 13a: Float connection pin, 14: Bearing hardware, 15: Upper limit water level detection float, 16: Lower limit water level detection float, 17 : Float rod, 18: Water intake, 18a: Water intake fitting, 19: Drain pipe, 20: Drain pipe open / close valve, 20a Drain outlet, 21: Open / close valve operating bar, 30: First switching valve, 31: Second Switching valve b, 32: Switching valve actuating lever, 33: Check valve, 34: Flow rate adjusting valve, 35: Automatic circuit switching valve, 36: Relief valve, 37: Directional control valve, 38: Hydraulic pump, 39: Hydraulic operation unit

Claims (1)

Waterway to cross, incorporating a gate and lowering can installed to water upstream stands up against flowing water direction by the driving of the gate drive shaft, a gate driving unit for driving the gate drive shaft, the water from the water channel intake In the operating device of the undulating gate equipment in which the gate driving device room is arranged through the water channel and the side wall of the water channel, provided with a drain port for discharging water to the mouth and the water channel,
The gate drive of the gate drive chamber, the gate drive shaft extending to the gate drive chamber through the channel sidewall includes a drive arm for rotating the hydraulic cylinder, for driving the lift by the water level of the gate drive chamber The gate is raised and lowered by transmitting the rotational drive force of the drive arm and the rotational drive force of the float drive shaft to the float drive shaft connected to the float arm that supports the float and rotationally driven by raising and lowering the drive float. Are combined as
The drain port is provided with a drain pipe on / off valve that opens the drain port in a state where the gate is completely lying down by an on / off valve operating rod connected to the float arm,
The hydraulic cylinder is connected to an overlying hydraulic circuit that drives the hydraulic cylinder in the contracting direction to invert the gate , and an upright operating hydraulic circuit that drives the hydraulic cylinder in the extending direction to stand the gate ,
The overturn hydraulic circuit has a first switching valve that communicates with a hydraulic cylinder to operate the gate in the direction of overturning when the upper limit water level detection float rises and exceeds the upper limit water level,
The upright hydraulic circuit has a second switching valve that communicates with a hydraulic cylinder in order to operate the gate in a direction to erect when the lower limit water level detection float descends and falls below the lower limit water level. Actuator for gate equipment.

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