JPS597935B2 - High precision water level meter verification device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention mainly relates to a verification device for highly accurate verification of various water level gauges for hydraulic models.

The conventional method for verifying water level gauges is to suspend the water level gauge or use a similar support, raise and lower the supporting part with a micrometer, and verify the output of the water level gauge based on the micrometer reading. How to do it, etc.
These verification methods have drawbacks such as measurement errors due to wear of the screws of the micrometer, which is a movable part.

In view of the above, the present invention, instead of moving the support part up and down with a micrometer, places a water level gauge on a drive stand and moves the stand up and down, and uses a height detector to measure the value of a linear scale installed separately from the drive mechanism. It is designed to detect distance with high precision and perform comparison tests with the output of a water level gauge.

Hereinafter, the embodiment of the present invention shown in the drawings will be described in detail. In FIG. A screw 4 is provided which is screwed into the screw hole of the base 3 to move it up and down, and this screw 4 is operated by a coarse movement hand 5 and a fine movement knob 6 which are protruded from the base 1 or the support 2. It is configured to be rotatable, and a drive stand 3 on which a water level gauge T is placed can be moved up and down.

The moving distance of the drive base 3 is determined by reading the value of a linear scale 9 provided on a column separate from the drive unit with high precision using a height detector. As shown in the figure.

In Figure 2, the linear scale 9 fixed to another support
is a glass scale with lines of 0.02cm width printed at intervals of 0.02mm as shown in Figure 4a,
On the other hand, the movable scale 10 disposed opposite thereto has a length that allows four light receiving transistors 11 to be vertically disposed behind it as shown in FIG. As shown in FIG.
Except that there is an interval of 0.03 genus for each position facing , it is 0.02 as in the above linear scale 9! fL7n line is 0
．． It is baked at intervals of 02 hawk dew. Then, sandwiching the linear scale 9 and the moving scale 10,
Four vertical light emitting diodes 12 provided on the drive base 3 are arranged to face the four light receiving transistors 11, and the output detected by the light receiving transistors 11 is electrically processed and then displayed on a reading counter 13. I try to let them do it. Further, the output of the water level gauge T is displayed on a water level gauge output counter 15 connected via a cable 14.
In the figure, 16 indicates a cable connecting the light receiving transistor 11 and the reading counter 13, 17 indicates a light emitting diode cable, and 18 indicates a container containing water.

In the water level gauge verification device having the above configuration, the line pattern of the moving scale of the height detector 8 has the function of delaying the phase of light entering the light receiving transistor 11 by 90 degrees, for example, the topmost light receiving transistor On the other hand, the output of the second one will be delayed by exactly 90 degrees in phase, similarly, the third one will be delayed by 90 degrees compared to the second one, and the fourth one will be delayed by 90 degrees than the third one. become.

Therefore, when the electrode needle of the water level gauge 7 placed on the drive stand 3 is put into the water in the container 18 and the drive stand 3 is moved up and down, the moving scale 10 moves with the movement, and the linear scale 9 and The light receiving transistor at the top of the moving scale 10 has a sine wave, the second one has a wave close to a COs wave, and the third and fourth ones have -sin waves and -
Waves similar to COs waves appear.

Therefore, by sending these outputs to a waveform shaping circuit and shaping the waveforms, pulses with different phases (a1 to A4 in Figure 5) are generated.
), then differentiated and synthesized (see Figure 5 b1 to B4), the obtained pulse group (see Figure 5 c) is 0.0
2R7! Since this corresponds to dividing the interval between the lines of L into 1/2, highly accurate reading can be performed by counting the pulse group.

Note that two Sis with the same period and a phase difference of π/2
By superimposing waves close to the n wave to form a third sine wave, and changing the amplitude of the two original waves at that time, the phase of the third wave can be changed appropriately, as described above. If the waveforms are shaped into pulses, differentiated, and synthesized in the same way as in the case of , pulses with even shorter periods can be obtained, and reading accuracy can be further improved. In this way, by comparing and examining the value displayed on the reading counter 13 with the value of the water level gauge output counter 15 operated by the output from the water level gauge 7, the water level gauge can be verified.

According to the testing device of the present invention described in detail above, as listed below, the drawbacks of conventional testing can be overcome, excellent effects can be achieved, and water level gauges can be rigorously tested. (a) Since the linear scale is separated from the pillar of the drive section, there is no distortion due to wear or load.

If the linear scale is directly attached to the pillar that supports the drive unit that carries the water level gauge and moves it up and down, the load of the water level gauge (
1009 to K9) are applied to the threaded rods and columns supporting the drive platform, causing load strain, deflection, etc. Furthermore, the temperature characteristics of the structural material occur, resulting in the scale itself of the linear scale attached to it becoming out of order. However, by installing a linear scale perpendicularly to the pedestal separately from the support of the drive section, it is possible to eliminate the effects of load strain, etc., and temperature characteristics of the structural material. b) Since the linear scale is installed separately from the column of the drive section, the column supporting the drive section does not need to be particularly strong or large. If the linear scale is directly attached to the support of the drive unit, the water level gauge should be mounted on the threaded rod or support that supports the drive stand that moves up and down. As mentioned above, this occurs as a scale error of the linear scale. The only way to minimize these distortions and errors is to make the device itself more robust and larger. However, the temperature characteristics of the structural material will affect the linear scale unless it is separate from the support etc. The present invention does not solve these problems with a simple structure. c)
If the reference linear scale is not separate from the column,
In order to eliminate temperature distortion in the constituent materials, it is necessary to do things such as doing it in an environment where the temperature is constant throughout the year, or making it from a material with small temperature characteristics.

In addition, the screw rods and columns that support the drive platform that carries water level gauges of various sizes and move up and down are subject to strain and deflection under load, so in order to reduce the effects of this, they must be strong and robust.
It needs to be large. However, in the present invention, since the linear scale is provided on a column separate from the drive section, special considerations for maintaining measurement accuracy are not required in the design of the column of the drive section.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a high-precision water level meter verification device v to which the present invention is applied, Fig. 2 is an enlarged plan view of the height detector, Fig. 93 is a front view of its main parts, and Fig. 4 A and b are linear Front views of the scale square and the moving scale, FIGS. 1... Base, 2... Pillar, 3...
...Drive base, 4...Screw, 7...Water level gauge, 8...Height detector.

Claims (1)

[Claims] 1. A screw for vertically moving the drive platform on which the water level gauge is placed is provided on a column erected on the base, and a drive unit is configured to move the drive platform up and down by rotation of a handle or knob, and this drive unit A high-precision water level meter verification device, characterized in that a linear scale is provided on a separate column, and a height detector for reading the linear scale is provided on the drive stand.