JPH04161511A - Opening-measuring instrument for gate - Google Patents

Abstract

PURPOSE:To reduce costs for production by a method wherein one end of an opening lever is attached to a revolving shaft provided to a dam, and an opening-measuring instrument tube equipped with a detecting tube enclosing the liquid and sensor that detects the pressure produced by the liquid is provided to the lever in its longitudinal direction. CONSTITUTION:A revolving shaft 7 rotatably provided to a dam 1 is turned and an opening lever 9 is swung in the same direction, and the pressure in the perpendicular direction is changed in accordance with swung motion of the lever with the weight of the liquid enclosed in an opening-measuring instrument tube 11. The pressure produced by the liquid in the tube 11 is measured by a quartz pressure sensor 15 provided in the lower part of the tube 11, and the angle of rotation as the opening of the opening lever 9 is precisely detected. Thereby costs for production can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an opening meter for a gate used in a dam, weir, waterway, etc.

(Prior art) Conventionally, as gate opening gauges used for dams, weirs, waterways, etc., there are two types: one is a sensor that connects a Selshin motor to the rotating part of the gate and calculates the opening from the amount of rotation, and the other is the one that measures the opening from the amount of rotation of the gate. A measuring plate with a measuring scale is attached to the side, and a detector is installed at the tip of the opening lever.As the opening lever rotates with the rotation of the gate, the detector reads the measuring scale on the measuring plate and determines the opening. It is generally known that it is produced by

(Problem to be Solved by the Invention) By the way, among the above-mentioned conventional opening degree meters, the former one detects the opening degree by a celsin motor via a drive transmission member such as a rope or wire, so it is prone to errors. There was a problem in that accurate opening accuracy could not be obtained due to this.

Further, although the latter type has better opening precision than the former type, there is a problem in that the construction cost is high and the manufacturing cost is high.

The purpose of this invention is to improve the above-mentioned problems by providing an opening meter for gates used in dams, weirs, waterways, etc., which has good opening accuracy, requires little manufacturing cost, and is easy to install. It is about providing.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention provides a rotatable shaft in a dam, weir, waterway, etc., and attaches an opening lever to this rotary shaft. One end of the opening lever is attached as a gate opening gauge, and the opening lever is equipped with a detection tube filled with liquid in the longitudinal direction of the opening lever, and a opening gauge tube equipped with a sensor that detects the pressure caused by the liquid. The meter was constructed.

(Function) By adopting the opening degree meter of the gate of this invention, when the rotating shaft is rotated, the opening lever also rotates in the same direction, and the opening degree is adjusted according to the rotation of the opening degree lever. The vertical pressure changes depending on the weight of the liquid sealed in the detection tube provided in the meter tube. By detecting this vertical pressure with a sensor, the opening degree of the opening lever can be accurately detected. Note that the longer the length of the opening meter tube attached to the opening lever, the more accurately the opening will be detected. By using a high-precision differential pressure gauge for the pressure t1, the opening accuracy is good, and the opening gauge tube can be integrated into a simple pipe shape, so the manufacturing cost is low and it is easy to install. becomes.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

Referring to FIG. 1, the dam includes a dam body 3 made of concrete, for example, and a lower side wall 3 of the dam body 3.
A freely rotatable rotating shaft 7 extending in a direction perpendicular to the plane of the paper is supported by a plurality of brackets 5. One end (lower end) of an opening/closing lever 9 extending in the longitudinal direction is attached to the rotating shaft 7.

This opening/closing lever 9 is provided with an opening measuring tube 1 which is partially filled with liquid oil that extends in the longitudinal direction, and at the bottom of this opening measuring tube 1 is a valve for detecting pressure. A crystal pressure sensor 13 is provided as a sensor.

One end of a rotating arm 15 is attached to the rotating shaft 7, and a rod fitting 19 is attached to the other end of the rotating arm 15 via a pin 17. On the other hand, a plurality of brackets 21 such as anchor bolts are fixed to the lower wall 3D of the dam body 3, and the rear part of a hydraulic cylinder 25 is pivotally supported to the upper part of the bracket 21 via a pin 23. There is. A piston rod 27 is attached to the front part of the hydraulic cylinder 25, and the tip of the screw rod 27 is provided on the rod mounting bracket 19.

With the above configuration, by activating the hydraulic cylinder 25 and contracting the piston rod 27 to the left, the rotating shaft 7 is rotated counterclockwise via the rotating arm 15. When the rotation shaft 7 is rotated, the opening/closing lever 9 is rotated in the same direction as the rotation shaft 7 as shown by the arrow, and the rotation angle θ as the opening degree is set to a desired angle.

The rotation angle θ of this rotation can be set within a range of about 90 degrees from a vertical state to a horizontal state of the opening lever 9.

In order to accurately obtain this rotation angle θ, the opening/closing lever 9 has an opening measuring tube partially filled with oil extending in the longitudinal direction.
A crystal pressure sensor 13 is installed at the bottom of the opening gauge tube 11.
is provided. Since this crystal pressure sensor 13 itself is already known, its general configuration will be explained as follows.
As shown in FIG. 2, the base plate 29 of the crystal pressure sensor 13 is attached to the opening meter tube 11 with a plurality of screws.
is fixed. A vacuum case 31 is disposed on this base plate 29, and the vacuum case 3
A part of the support arm 35 is provided between the bellows 33 provided above and below.

A detection tube 37 is connected to the upper bellows 33 via three connecting tubes, and a certain amount of oil is sealed in the detection tube 37. A pipe 43 is connected to the lower bellows 33 via a connecting pipe 41, and this pipe 43.
Internal pressure is applied to the lower bellows 33 from the opening gauge tube].

The support arm 35 is provided with a pivot 45, and a crystal oscillator 47 is provided on the right side of the support arm 35.

With the above configuration, when pressure is applied to the pressure inlet (2), the sum of vertical oil pressure and internal pressure is applied to the upper bellows 33 through the detection tube 37, while from the pressure inlet (2) side to the lower bellows 33 as described above. Internal pressure is applied. Only the vertical pressure of the oil, which is the difference in pressure, is transmitted to the crystal oscillator 45 by the support arm 35.

When stress is applied to the oscillator of a crystal, the oscillation frequency changes linearly, so pressure can be directly converted into frequency, making it highly accurate and allowing pressure to be measured as a digital quantity. Note that the oil sealed in the detection tube 37 is subjected to appropriate heat treatment to release the mixed gas, and then the oil sealed in the detection tube 37 is directly evacuated. It is enclosed in the connecting pipe 39 and the upper bellows 33. Furthermore, in order to suppress changes in oil level due to temperature changes, vibrations, etc., and to prevent moisture, it is effective to isolate the opening gauge 11 from the outside and seal it under an appropriate pressure. At this time, it may be sealed with rust-preventing gas.

Now, assuming a gate as shown in FIG. 3(A) and assuming that the opening lever 9 rotates at an angle θ of 0 to 90 degrees, the opening degree G can be determined as follows.

For simplicity, if the pressure gauge is set so that the indicated value of the pressure gauge becomes zero at θ = 90 degrees, then D = Rs-co
sθ・ρ (where: ρ=specific gravity of oil)...(1) Therefore, cos θ−DI(R8・ρ)
...(2), the angle θ is calculated based on the indicated value of the pressure gauge.

The opening degree G in this example is G''RG@CO8θ, (3).

Therefore, the angle θ can be measured by the crystal pressure sensor 13 in the manner described above. In addition,
For example, the length R5 is 1000. RG is 2000″″ρ is 1. If the accuracy of the pressure sensor is ±1 mm, the measurement error of the opening G can be measured within ±2 mm, so a highly accurate opening can be obtained.

Therefore, if the pressure is accurately measured from 0 degrees when the opening lever 9 is vertical to 90 degrees when it is horizontal, the relationship between the pressure and the rotation angle θ can be determined, for example, as shown in Fig. 4. Required in advance. Furthermore, the rotation angle θ and the amount of water to be released are determined by detecting the rotation angle θ at the time when the dam 1 is designed in advance, and the amount of water to be released is determined based on the water level and the shape of the gate.

FIG. 5 shows a block diagram of the configuration of the opening degree gauge. In FIG. 5, the CPU 49 in the control device is connected to the crystal pressure sensor 13 and the counter, and the relationship between the oil pressure and the rotation angle θ as shown in FIG. 4 is set. 51 is connected. Further, an output section 53 is connected to the CPU 49.

With the above configuration, when the hydraulic cylinder 25 is operated,
When the opening lever 9 rotates, the oil pressure in the detection tube 37 provided on the opening lever 9 is detected by the crystal pressure sensor 1.
Detected at 3. The oil pressure detected by this crystal pressure sensor 13 is used as a frequency count value by the CPU 4.
9, and after predetermined calculations are performed based on the relationship between the oil pressure and the rotation angle θ shown in FIG. 4, the opening degree is output.

In this way, the detection tube 37 filled with oil is installed to the desired length in the longitudinal direction of the opening lever 9, and this detection tube 3
Since the crystal pressure sensor 13 is provided at one end (lower part) of the opening 7, by detecting the oil pressure with the crystal pressure sensor 13, the rotation angle θ can be accurately detected as the opening degree. Furthermore, the longer the length of the detection tube 37 is, the more the accuracy of the rotation angle θ can be improved.

Furthermore, since the opening gauge tube 11 provided with the crystal pressure sensor 13 is simply attached to the lower part of the opening lever 9, the installation is simple and the manufacturing cost is less than that of the prior art.

Further, as shown in FIG. 6, a rotating shaft 7 is rotatably supported on the dam body 3 of the dam 1.

One side of a gate arm 55 is attached to this rotating shaft 7, and a skin plate 57 is provided on the other side of the gate arm 55. One end of a wire 59 is attached to one side of the skin plate 57, and the other end of the wire 59 is attached to a wire winding facility 61.

Then, the wire hoisting equipment 61 is activated, and the wire 5
Even in a position gauge in which the opening is determined by rotating the skin plate 57 about the rotating shaft 7 via the gate arm 55, the opening measuring tube 1 and the sensor 1 are connected to the gate arm 55.
3 and measure the opening degree.

Note that this invention is not limited to the embodiments described above, and can be implemented in other forms by making appropriate changes. In this embodiment, the dam gate can be applied not only to the one shown in FIG. 1 but also to the radial (dish-shaped) one shown in FIG. 6. The pressure sensor may be other than a crystal pressure sensor.

[Effects of the Invention] As can be understood from the above description of the embodiments, according to the present invention, an opening π1 tube partially filled with liquid is installed in the longitudinal direction of the rotatable opening lever, By installing a sensor that detects pressure at the bottom of this old opening tube, the sensor measures the pressure of the liquid in the opening meter tube, and accurately determines the opening and rotation angles from -11 to -11 on the opening lever. can be detected. Also,
Since the opening gauge tube is simply installed in the longitudinal direction of the opening lever and the sensor is provided at the bottom of the opening gauge tube, the installation is simple and the manufacturing cost is much lower than in the past.

[Brief explanation of drawings]

Fig. 1 is a side cross-sectional view of a dam gate in a dam according to an embodiment of the present invention, Fig. 2 is an enlarged detailed view of the part shown by the ■ arrow in Fig. 1, and Fig. 3 is a view when the opening lever is rotated. Figure 4 is an example diagram showing the relationship between oil pressure and rotation angle, and Figure 5 is an illustration of the control device that actually detects the rotation angle. Configuration block diagram,
FIG. 6 is a diagram showing another embodiment of the opening degree meter in place of FIG. 1. ■...Dam 7...Rotary shaft 9...Opening lever 11...Opening meter tube 13...Crystal pressure sensor (sensor)] 5...Rotating arm 25.
・Hydraulic cylinder 27...Piston rod 37...
Detector tube 5] ・Setting department agent Patent attorney Hidekazu Miyoshi-13~ Taeguchi

Claims (1)

[Claims] A rotary shaft that can rotate freely is provided in a dam, weir, waterway, etc., and one end of an opening lever is attached to this rotating shaft to make a gate opening gauge, and a liquid is sealed in the longitudinal direction of the opening lever. An opening meter for a gate, comprising a detection tube and an opening meter tube equipped with a sensor for detecting the pressure caused by the liquid.