JPH1048024A - Water level measuring device and water level automatic measuring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To rapidly measure a water level with high accuracy, by irradiating a laser beam onto the water surface from a sensor part, and detecting the spot position on a light reception detecting element, of the reflected light. SOLUTION: A sensor part of a laser displacement meter drives a driving circuit 13, so that the laser beam outgone from a semiconductor laser 11 is condensed by a light projecting lens 14, for irradiating the water surface 8 of a container. A part of the laser beam diffused and reflected by the water surface 8, forms a spot on a photo detecting element 12 through a photo receiving lens 15. The spot is moved every time the water surface 8 is moved, so that the displacement to the water surface 8 can be detected by detecting the spot. The displacement detected by the photo detecting element 12, is amplified by a signal amplifing circuit 16, to be input to a personal computer through a controller part. And the water level is measured by the computer processing by multiplying the correction coefficient. Thereby the water level can be rapidly measured with high accuracy by an unit of 1/100mm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water level measuring device and a water level automatic measuring device, and more particularly to a metal for holding a shaft of a turbine generator at a center position, which is carried out when disassembling and assembling the turbine generator. The present invention relates to a water level measuring device and a water level automatic measuring device used for measuring the level of each bracket for supporting the water turbine and measuring the displacement of a building accommodating the turbine generator.

[0002]

2. Description of the Related Art The shaft of a water turbine generator is disposed vertically at the center of each metal. For this reason, the metal support for supporting each metal is also arranged vertically. In order for the metal support base to be vertical, a surface orthogonal to the vertical surface of the bracket for mounting the metal support base is required to be a horizontal plane. Since the bracket is required to have a high degree of horizontality of 1/100 mm, a water level measuring device capable of measuring 1/100 mm is used.

In a conventional water level measuring apparatus, an indicated value at the moment when a pointed tip such as a needle of a depth micrometer attached to a measuring table comes into contact with the water surface is visually read, and a required value is calculated manually. I was

[0004]

According to the conventional water level measuring device as described above, a skilled person is required for the measurement by the depth micrometer, and since the skilled person has individual differences, it is necessary to determine the person to be measured. Yes, the measurement was performed carefully several times, and after all the measurements were taken, the data was collected manually, which took a considerable amount of time.

[0005]

In view of the above circumstances, the present invention provides a measuring table on a water-filled container so that the water level can be quickly and accurately measured in units of 1/100 mm. Place the sensor part of the laser displacement meter attached to
The water level measuring device is configured to irradiate a laser beam onto the water surface from the sensor unit and detect a spot position of the reflected light on the light receiving / detecting element to measure a distance to the water surface.

[0006] Further, according to the present invention, a sensor portion of a laser displacement meter attached to a measuring table is placed on a water-filled container placed on an object to be measured, and the water surface is irradiated with laser light from the sensor portion. The distance to the water surface is measured by detecting the position of the spot on the light-receiving element of the reflected light, and the sensor output is input to the personal computer via the controller of the laser displacement meter, and the level of the measured table is calculated by computer processing. And a water level automatic measuring device.

Further, the present invention does not require a skilled person,
In order to make it possible for anyone to measure, place the sensor of the laser displacement meter on the measuring table on a water-filled container placed on the object to be measured at the required angle to minimize the transmission of laser light into water. The sensor is irradiated with laser light from the sensor unit, and the distance to the water surface is measured by detecting the position of the spot of the reflected light on the light receiving and detecting element. A water level automatic measuring device is provided which is inputted to a personal computer via a controller unit, multiplied by a correction coefficient, and obtained by computer processing to obtain the level of the object to be measured.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on specific embodiments shown in the accompanying drawings. FIG. 1 shows an automatic water level measuring apparatus according to the present invention. A container 3 filled with water 2 is placed on a predetermined portion of a measured object 1 such as a bracket.

The laser displacement meter 4 includes a sensor section 5 and a controller section 6. The sensor section 5 is supported by a measuring table 7 mounted on the object 1 to be measured, and is provided on a water surface 8 of the water 2 of the container 3. They are arranged at opposing positions. The sensor unit 5 and the controller unit 6 of the laser displacement meter 4 are connected by a cord 9 having a length of 3 m. The controller 6 includes a personal computer 10
Are connected, and both the controller unit 6 and the personal computer 10 are connected to an AC 100 V power supply.

As shown in FIG. 2, the sensor section 5 uses a semiconductor laser 11 and a light position detecting element 12 as light emitting elements. When the drive circuit 13 is driven, the semiconductor laser 1
The laser light emitted from 1 is condensed by the light projecting lens 14 and irradiates the water surface 8. A part of the laser light diffusely reflected by the water surface 8 passes through the light receiving lens 15 and the light position detecting element 1
Connect a spot on 2. Since the spot moves each time the water surface 8 moves, the displacement up to the water surface 8 can be known by detecting the position of the spot. The displacement detected by the light position detection element 12 is amplified by the signal amplification circuit 16 and output to the controller 6.

The working distance L ₁ shown in FIG.
0 is 50 mm, the measuring range L ₂ is ± 8 mm, the resolution.
5 μm. Next, an example of measurement by the above-mentioned automatic water level measuring device will be described. FIG. 3 shows an example of the vertical shaft turbine generator.
The upper part is a generator 31, the lower part is a water turbine 32, and a turbine generator shaft 33 standing in the center is rotatably supported by an upper metal 34, a thrust metal 35, a lower metal 36, and a water turbine metal 37. . Reference numeral 38 denotes a rotor, and reference numeral 39 denotes a runner.

In the measurement of the upper bracket 40 supporting the upper metal 34, as shown in FIG. 4, water containers 42 are arranged at eight equally distributed locations on the circumference, and connected by a vinyl hose 43 to allow water to communicate. After water was filled and the water level was stabilized, the measurement was performed five times at each of the eight locations. The data is as shown in Table 1.

[0013]

[Table 1]

As shown in Table 1, an average value of five times is obtained.
When the difference from the minimum average value is obtained, 0, 1, 2, 3 (unit:
1/100 (mm)). Also, in the measurement of the turbine wheel metal table 41 supporting the turbine wheel metal 37 shown in FIG. 3, as shown in FIG.
The measurement was performed five times for each of the eight locations. The data is as shown in Table 2.

[0015]

[Table 2]

As shown in Table 2, an average value of five times is obtained.
The difference from the minimum average value is 0, 2, 3, 5, 7 (unit: 1/100 (mm)). Next, FIG. 6 shows a horizontal axis turbine generator, in which the turbine and the generator are rotatably supported by a turbine bearing A, a generator mountain side bearing E, and a generator river side bearing F. These bearings A, E, F Each is supported by a bearing stand.

Two water containers 4 for each of these bearing bases
2 and all the water containers 42
By connecting with water so that the water can communicate, fill the water and wait for the water level to stabilize, then measure the water level of each container,
It is to compare the relative levels of each metal. As shown in FIG. 7, two measurement points of each of the bearings A, E, and F were measured five times. The data is as shown in Table 3.

[0018]

[Table 3]

By the way, the object to be measured this time is a water surface,
If the laser light is irradiated perpendicularly to the water surface, the laser light will penetrate into the water and the amount of reflected light will be small, making measurement impossible. Therefore, if the amount of reflected light is increased by adjusting the mounting angle of the sensor unit, the linear relationship with the distance is lost, but direct measurement of the water surface is possible. As a result of the measurement, it was found that when the mounting angle of the sensor section was set to 11 °, the amount of reflected light was maximized. The measurement can also be performed by floating a reflector on the surface of the water, but it is practically difficult to adopt it.

As shown in FIG. 8, when the sensor unit 5 was tilted 11 ° in the regular reflection direction, the maximum amount of reflected light was obtained. When the sensor unit 5 is tilted by 11 °, the amount of reflected light can be maximized, but since there is no linear relationship with the distance, it is necessary to correct it. The measurement of the correction coefficient was performed using a vertical machining center 21 shown in FIG.

As shown in FIG. 9, the machining center 21
11 ° on a measuring table on a container 3 filled with water 2 placed on
The sensor unit 5 mounted at an angle is placed. Next, when the display of the sensor unit 5 is 0, the machining center 21 is also set to 0. The display of the sensor unit 5 is read by moving the machining center 21 by 1.000 mm with respect to the reference. Table 4 shows an example of the measurement.

[0022]

[Table 4]

This correction coefficient is incorporated in the personal computer 10 so that, even if the sensor section 5 is tilted by 11 ° and measured by computer processing, the correction coefficient is corrected so that the accurate distance from the sensor section 5 to the water surface 8 is obtained. I have.

[0024]

According to the present invention, as described above, the sensor section of the laser displacement meter attached to the measuring table is placed on a container filled with water, and the water surface is irradiated with laser light from the sensor section, and the reflected light is reflected. Since this is a water level measuring device that measures the distance to the water surface by detecting light, the water level is reduced to 1/1.
Accurate and quick measurement in units of 00 mm.

Further, according to the present invention, a sensor section of a laser displacement meter having a measuring table mounted thereon is placed on a water-filled container arranged on an object to be measured, and the water surface is irradiated with laser light from the sensor section. By detecting the reflected light, the distance to the water surface is measured, and the sensor output is input to a personal computer via the controller of the laser displacement meter, and the water level is automatically measured by computer processing to obtain the level of the object to be measured. Since it is a device, the water level can be measured accurately and quickly automatically in units of 1/100 mm.

Further, according to the present invention, the sensor unit of the laser displacement meter is provided on a measuring table on a water-filled container placed on the object to be measured, in order to minimize the transmission of laser light into water. The sensor unit irradiates the surface of the water with laser light, detects the reflected light, measures the distance to the surface of the water, and outputs the sensor output to the personal computer via the controller unit of the laser displacement meter. Since it is an automatic water level measuring device which is inputted and multiplied by a correction coefficient to obtain the level of the object to be measured by computer processing, the water level is reduced to 1/10
Since it can be performed automatically and quickly with accuracy of 0 mm,
Anyone can measure without requiring a skilled person.

[Brief description of the drawings]

FIG. 1 is a schematic view of an automatic water level measuring device of the present invention.

FIG. 2 is a schematic diagram of a sensor unit according to the present invention.

FIG. 3 is a diagram showing an outline of a longitudinal sectional view of a water turbine shaft.

FIG. 4 is a diagram showing measurement points of an upper bracket A according to the present invention.

FIG. 5 is a view showing measurement points of a water turbine metal stand F according to the present invention.

FIG. 6 is a diagram showing an outline of a bearing stand of the horizontal shaft turbine generator.

FIG. 7 is a diagram showing measurement points of a water turbine bearing base A, a generator mountain side bearing base E, and a generator river side bearing base F.

FIG. 8 is a schematic diagram showing a state where the sensor unit according to the present invention is arranged at an angle.

FIG. 9 is a front view schematically showing a machining center for measuring a correction value.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Measurement object 2 ... Water 3 ... Container 4 ... Laser displacement meter 5 ... Sensor part 6 ... Controller part 7 ... Measurement stand 8 ... Water surface 9 ... Code 10 ... PC 11 ... Semiconductor laser 12 ... Optical position detecting element 13 ... Drive Circuit 14: Projection lens 15: Light receiving lens 16: Signal amplification circuit 21: Machining center

Claims (3)

[Claims] 1. A sensor unit of a laser displacement meter having a measuring table mounted thereon is placed on a container filled with water, and the surface of the water is irradiated with laser light from the sensor unit, and the reflected light is detected to detect the reflected light. A water level measurement device that measures distance. 2. A sensor section of a laser displacement meter to which a measuring table is attached is placed on a water-filled container placed on a measurement object, and a laser beam is irradiated on the water surface from the sensor section, and the reflected light is emitted. An automatic water level measuring device that measures the distance to the water surface by detecting, and outputs the sensor output to a personal computer via the controller of the laser displacement meter, and obtains the level of the object by computer processing. 3. A sensor unit of a laser displacement gauge is mounted on a measuring table on a container filled with water, which is disposed on the object to be measured, at a required angle to minimize transmission of laser light into water. The sensor unit irradiates laser light to the water surface from the sensor unit and measures the distance to the water surface by detecting the reflected light.The sensor output is input to the personal computer via the controller unit of the laser displacement meter and corrected. An automatic water level measuring device that multiplies a coefficient and obtains the level of an object by computer processing.