JPH044023Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is used to control the opening of a tipping gate installed at a water intake for a river, etc., especially for agricultural or water supply applications that require water level maintenance. Regarding equipment.

[Prior art] A tipping gate that detects the water level and automatically opens the tipping gate when the water level of a river or the like rises abnormally is disclosed in Japanese Utility Model Application Publication No. 55-126334 and Japanese Utility Model Publication No. 55-126334.
It is generally known from Publication No. 49-9621 and the like.

Among these conventional devices, the former device detects the water level by providing a plurality of floats, each of which is connected to a corresponding mechanical switching valve using a separate rope.

The latter device automatically raises and lowers the gate, but its structure is such that outside water flows into the bucket from the water pipe and its weight pushes down the check valve to open the hydraulic passage. In addition, when the water in the bucket is drained by a siphon and the weight of the bucket becomes lighter, a spring pushes up the check valve and blocks the passage.

[Problem to be solved by the invention] Therefore, the former type of conventional device requires a plurality of floats and mechanical switching valves corresponding to each float, and it is difficult to detect the water level. As the system progressed to a new stage, the hydraulic piping for operation became multiple lines, and the configuration was complex, creating problems in terms of operation and maintenance management.

In addition, with the latter device, since the position of the entrance of the water pipe is determined, the overturning water level can only be adjusted within a certain range even if the force of the spring is adjusted, and if it is stepless, multiple water pipes are installed. There is a problem in that it is necessary to do so, and it is inevitable that there will be multiple series.

In particular, this type of overturning gate is controlled during the day by the operator operating the control panel according to the required water level, but at night when the water level is unattended, it is automatically controlled when the water level rises above the set water level. Reliability was a problem because the gate had to be opened to lower the water level. In particular, if the water level is detected using an electric water level gauge, there is a risk that control will be lost during a power outage, leading to an unexpected situation.

The present invention was developed in view of the above-mentioned problems of the conventional technology, and its purpose is to enable stepless detection and adjustment of the water level with a single float. At the same time, it is possible to control the gate in the opening direction at all times, even at night, regardless of power outages, without requiring external operating power, and this stepless control is performed using a single hydraulic piping system. An object of the present invention is to provide an accurate and reliable opening control device for an overturning gate.

[Means for Solving the Problems] In order to achieve the above object, the overturning gate opening control device in the present invention has a lower end hinge portion 1a.
In a device in which an overturning gate 1 which opens and closes a waterway by raising and lowering a range from an upright position to a collapsed position using a fulcrum as a fulcrum, and a hydraulic cylinder 2 for opening and closing the overturning gate are provided at the bottom of the waterway, the hydraulic cylinder 2 for opening and closing the gate is provided with:
A ball valve 4 that opens and closes the valve port 4a and a pilot control valve 6 equipped with a piston 5 that presses the ball valve so as to close with the force of a spring 3 are connected by a pipe 7, and the piston 5 of the pilot control valve 6 A balance lever 9 supported horizontally by an intermediate fulcrum shaft 8 is connected to the upper end of the piston rod 5a projecting upward, and a counterweight 10 is attached to the rear end of the balance lever 9 so that its position can be adjusted. A floating rod 11 is mounted on the upstream water surface and floats on the water surface when the water level rises abnormally.
A connecting portion 23 to the balance lever 9 at the upper end of the piston rod 5a is set between the intermediate fulcrum shaft 8 and the float 11 at its front end, and the piston 5 is attached to the pilot control valve 6. A spring presser 17 is provided which can be operated externally to adjust the spring pressure.

In addition, the intermediate fulcrum shaft 8 of the balance lever 9 is attached to a bracket 2 that is integrated with the main body case of the pilot control valve 6.
2 via a link plate 18 which is pivotally supported to be swingable back and forth about a pivot pin 19 as a fulcrum.

[Operation] FIG. 1 shows a state in which the gate 1 is closed and the water level is maintained at a constant set water level LWL.

In this state, the float 11 is suspended by its own weight on the water surface away from the water surface of the LWL.
It is assumed that the counterweight 10 balances the weight of the hanging rod and the balance lever using the intermediate fulcrum shaft 8 as a fulcrum.

The ball valve 4 of the pilot control valve 6 receives water pressure and hydraulic pressure that supports the gate's own weight from the hydraulic cylinder side.

Now, assuming that the pressing force of spring 3 is 100 Kgf, the pressing force due to the float's own weight is 440 Kgf, the cross-sectional area of the ball valve is 0.3 cm, and the hydraulic pressure from the ² hydraulic cylinder is 18 Kgf/cm ² , (100 + 440 = 540 Kgf) > (0.3 × 18 = 5.4Kgf), and in this state, the hydraulic pressure acting on the ball valve 4 is smaller than the pressing force due to the pressing force of the spring 3 and the float's own weight, so the ball valve does not open.

When the water level rises abnormally and reaches the upper limit abnormal water level HWL, the float 11 floats up on the water surface, generating buoyancy and pushing up the hanging rod 11a, so the balance lever 9 rotates clockwise around the intermediate fulcrum shaft 8. Then, pull up the piston rod to remove the spring pressure acting on the ball valve.

When the spring pressure is removed, the ball valve 4 is pushed up by the cylinder oil pressure, the hydraulic oil flows out to the outlet 6b, and the gate 1 starts to open.

Now, the cross-sectional area of the piston 5 is 30cm ^{, and} the hydraulic pressure from the hydraulic cylinder at HWL is 50Kgf/
cm ² Piston rod pulling force due to float buoyancy640
Kgf, (100 + 440 = 540 Kgf) < (30 x 50 + 640 = 2140 Kgf), and the hydraulic oil that has passed through the ball valve is pushing up the piston 5, so the gate continues to open.
The water level will drop.

When the water level approaches LWL, the float moves away from the water surface, so the pressing force due to its own weight, spring pressure, and hydraulic pressure from the cylinder act on the piston rod of the pilot control valve.

Since the LWL has not been reached yet, the hydraulic pressure is 18Kg.
If the hydraulic pressure is now 20Kgf/ ^cm2 , then (100+440=540Kgf)<(30×20=600Kgf), ^the ball valve is still open and the gate continues to open.

When it reaches LWL, the hydraulic pressure becomes 18Kgf/cm ² (100 + 440 = 540Kgf) = (30 x 18 = 540Kgf) When it goes below LWL, the spring pressure and the float's own weight become greater than the oil pressure, so the pilot control valve closes and the gate closes. It will stop automatically.

The operation of returning gate 1 from position B to position A is performed manually.

In this case, the pump 16 is driven to generate hydraulic pressure within the cylinder 2, and the cylinder 2 is raised up by the hydraulic pressure.

When the pump 16 is driven, hydraulic pressure acts on both the cylinder 2 side and the ball valve 4 side through the piping 7.

Now, if the pump pressure is 70Kgf/ ^cm2 , (100 + 440 = 540Kg) > (0.3 x 70 = 21Kgf), and the force acting on the ball valve is smaller than the pressing force due to the spring pressure and the float's own weight, so the ball valve is will not open.

When lowering the gate from position A to position B, if you want to stop the gate before or past B without stopping at B, move the counterweight 10 to the left (arrow A) or to the right (arrow A). (b), and either increase or decrease the pushing force of the piston rod due to the float's own weight, or operate the spring holder 17 to increase or decrease the spring pressure.

Alternatively, the float 11 may be replaced to adjust the buoyancy and dead weight.

For example, if you want to stop gate 1 between B and C, move counterweight 10 to the right (arrow B) and increase _L2 . Then, the pressing force against the piston rod due to the float's own weight becomes smaller, so the hydraulic pressure from the cylinder side pushes the piston up and the hydraulic oil flows out to the outlet 6b, so the gate 1 does not stop at B but at a position past B. Stop.

If you want the gate to fully open, move the counterweight 10 further to the right (arrow B),
The force applied to the piston rod may be reduced to less than the cylinder pressure due to the gate's own weight, or it may be replaced with an equivalently heavier one.

If the hydraulic pressure due to the gate's own weight is large, it may be possible to do this simply by minimizing the spring pressure.

In this way, it is possible to adjust the set water level LWL steplessly.

[Example] The length of the balance lever 9 is the distance L1 from the intermediate fulcrum shaft 8 to the float 11, the distance _L2 from the counterweight 10, and the distance _L from the intermediate fulcrum shaft 8 to the connection part 23 to the piston rod. ₃ , but _L1 and _L2 can be changed as appropriate.

In addition, the height H of gate 1 is the water depth from the normal water level LWL of water depth _H2 to the abnormal water level HWL.
Although it is specified to be a constant height in consideration of _H1 , the lifting height (position) of the float 11 with respect to the respective water levels HWL and LWL is targeted.

The gate 1 has a hinge part 1a fixed to the bottom of the waterway.
The gate is installed so that it can rise and fall freely using the gate as a fulcrum, and when the gate is opened, it is made to lie down to the downstream side.

The hydraulic cylinder 2 is installed at the bottom of the waterway on the downstream side of the gate 1, and is mounted so as to be tiltable about a pivot shaft 12 in the intermediate portion as a fulcrum.
The upper end of the piston rod 13a is connected to the gate 1, and the gate 1 is pushed up by hydraulic pressure.

The pilot control valve 6 consists of a ball valve 4 fitted into a valve port 4a so as not to come off, a piston 5 that presses the ball valve 4 with a spring 3, and a spring retainer 17 that adjusts the pressure of the spring 3. Valve inlet 6
a is connected to the back pressure side hydraulic port 2a of the hydraulic cylinder 2 through a pipe 7. A branch pipe 14 is provided in this pipe 7, and a check valve 15 and a pump 16 are provided therein.

A valve outlet 6b from the valve port 4a communicates with an oil tank 21 via a pipe 20.

The piston 5 is integrally provided with a piston rod 5a at its upper portion, and projects outwardly through the spring retainer 17, with its upper end protruding portion pivotally connected to the balance lever 9. Further, this piston 5 is integrally provided with a thin rod-shaped ball presser 5b at its lower part, and its lower end is brought into contact with the top of the ball valve 4.

The balance lever 9 is supported by a bracket 22 integrally fixed to the pilot control valve 6 via a link plate 18 so as to be able to swing about an intermediate fulcrum shaft 8, and a float 11 is attached to the front end of the lever and a float 11 is attached to the rear end. A counterweight 10 is provided respectively. The link plate 18 is supported so as to be able to swing left and right about a pivot pin 19 at the lower end.

The float 11 is pivotally supported by the front end of the balance lever 9 via a rod 11a, and is suspended so as to be swingable, and is attached so that its suspension length can be adjusted.

The mounting position of the counterweight 10 can be adjusted by moving it to the left (arrow A) or right (arrow B) with respect to the balance lever 9.

The connecting portion 23 of the upper end of the piston rod 5a of the pilot control valve 6 to the balance lever 9 is located close to the front of the intermediate fulcrum shaft 8 with the link plate 18, and the balance lever 9 swings up and down about the intermediate fulcrum shaft 8. The piston rod 5a is configured to move smoothly and not be restricted when the piston rod 5a is moved.

[Effects of the invention] Since the present invention is configured as described above,
This produces the following effects.

By operating the spring holder, the water level can be adjusted steplessly by increasing or decreasing the spring pressure to artificially open the gate or stop the gate from collapsing.

Such stepless adjustment of the water level can be performed not only by adjusting the spring pressure but also by adjusting the counterweight.

If the water level exceeds the set value and becomes abnormally high during unattended conditions, such as at night, the float is pushed up by the water surface and the pressure on the ball valve is released, thereby reducing the back pressure on the hydraulic cylinder. Since it can be released through a ball valve, the gate can be opened automatically to lower the water level to the set value.

The water level can be adjusted steplessly with a single float, and this stepless control can be performed with a single hydraulic piping system, resulting in accurate operation, high reliability, and simple configuration. It can be carried out at low cost.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional side view showing the entire opening control device for an overturning gate according to the present invention, and FIG. 2 is an enlarged sectional view of the pilot control valve. 1...Tipping gate, 2...Hydraulic cylinder, 3
... Spring, 4 ... Ball valve, 5 ... Piston, 6
... Pilot control valve, 7 ... Piping, 8 ... Intermediate fulcrum shaft, 9 ... Balance lever, 10 ... Counterweight, 11 ... Float, 17 ... Spring holder, 18 ... Link plate, 19 ... Pivot pin, 22...Bracket, 23...Connection portion.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) An overturning gate 1 that opens and closes a waterway by raising and lowering the range from an upright position to a collapsed position with the lower end hinge portion 1a as a fulcrum, and a hydraulic cylinder 2 for opening and closing the overturning gate at the bottom of a waterway. In this device, a pilot control valve 6 is installed in a hydraulic cylinder 2 for opening and closing a gate, and is equipped with a ball valve 4 that opens and closes a valve port 4a, and a piston 5 that presses the ball valve so as to close it with the force of a spring 3. A balance lever 9 horizontally supported by an intermediate fulcrum shaft 8 is connected to the upper end of the piston rod 5a of the pilot control valve 6, which is connected to the piston 7 through a piping 7, and a counter is connected to the rear end of the balance lever 9. A weight 10 is attached to the front end of the balance lever 9 so that its position can be adjusted, and a float 11, which is above the water surface on the upstream side and floats on the water surface when the water level rises abnormally, is attached via a hanging rod 11a. A connecting portion 23 to the balance lever 9 is set between the intermediate fulcrum shaft 8 and the float 11 at its front end, and the pilot control valve 6 is provided with an externally operated spring pressure adjustment to the piston 5. An opening control device for an overturning gate, characterized in that it is provided with a spring presser 17. (2) The intermediate fulcrum shaft 8 of the balance lever 9 is provided via a link plate 18 that is pivotally supported on a bracket 22 integral with the main body case of the pilot control valve 6 so as to be swingable back and forth about a pivot pin 19 as a fulcrum. An opening degree control device for an overturning gate according to claim 1, which comprises the above-mentioned utility model registration claim 1.