JPH06186014A - Measuring method for expansion quantity of elastic member - Google Patents

Abstract

PURPOSE:To reduce the diameter of a measuring cylinder, and to make measurement practicable without turbulence resulting from generated steam by floating a float in fluid in a measuring cylinder, and measuring a distance to the float using a laser type level instrument. CONSTITUTION:Stop valves 7, 8 are severally fully closed and opened, and fluid is supplied from a circuit 9 into a rubber hose 6 and pressurized, and then the valve 8 is fully closed. The fluid contained in the hose 6 and the inside is heated and expanded. When the valve 7 is fully opened, an expanded part of inside fluid is led from a circuit 10 into a measuring cylinder 12 by the restoring force of the hose 6 to float up a float 13 as much as its expanded part. A laser beam 15 is irradiated onto the float 13 at an optional angle (even a vertical direction is acceptable) from a laser type level instrument 14, and the angle of its reflection is measured to measure a distance between the float 13 and the level instrument 14. The above distance equals to the quantity of expansion of the float 13 floating above a reference level, and the quantity of expansion of the hose 6 to given heat is consequently measured. The diameter of the cylinder 12 can be set up less than about 10mm.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an expansion amount measuring device for measuring the expansion amount of hollow elastic members such as rubber hoses, synthetic resin hoses, diaphragms and accumulators.

[0002]

2. Description of the Related Art As a device for measuring the expansion of a rubber hose of this type, for example, the one shown in the circuit of FIG. 2 has been developed.

This is a graduated cylinder 1 which is a glass tube,
An ultrasonic level meter 2 arranged above the graduated cylinder 1,
A stop valve 3 openably and closably connected to the graduated cylinder 1 and a stop valve 4 openably and closably connected to a fluid supply source, and a rubber hose 5 for measurement is connected between the stop valves 3 and 4. is there.

In this measuring apparatus, the stop valve 3 on the graduated cylinder 1 side is fully closed, the stop valve 4 on the fluid supply side is fully opened, and a fluid such as long life cooler oil (LLC) or water is preliminarily stored in the rubber hose 5. And pressurize.

After that, the stop valve 4 is fully closed, the liquid temperature in the rubber hose 5 is raised to a high temperature of 100 to 200 ° C., and the rubber hose 5 and the fluid are expanded.

After that, when the stopper valve 3 on the graduated cylinder 1 side is fully opened, the expanded fluid is guided into the graduated cylinder 1 and the liquid level in the graduated cylinder 1 rises.

At this time, ultrasonic waves are emitted from the ultrasonic level meter to the liquid surface, and the amount of change in the liquid surface is measured by measuring the reflection time to measure the expansion amount of the rubber hose.

[0008]

In the above conventional measuring device, when the fluid in the rubber hose 5 is heated, steam is generated in the graduated cylinder 1 when the stop valve 3 is opened, and ultrasonic waves are generated by this steam. There is a problem that the measurement accuracy is deteriorated due to the disturbance.

When the diameter of the graduated cylinder 1 is, for example, 10 mm or less, the amount of rise of the liquid level in the graduated cylinder 1 is larger than that of the graduated cylinder 1 or more, which facilitates the measurement. The ultrasonic wave cannot be satisfactorily radiated onto the liquid surface because the bore in 1 becomes smaller.

Therefore, it is absolutely necessary to form the graduated cylinder 1 to have a diameter of 10 mm or more. In this case, on the contrary, there is a problem that the amount of change in the liquid surface is small and the detection accuracy deteriorates.

Therefore, an object of the present invention is that even if a fluid is heated to generate steam, measurement can be performed without being disturbed by this steam, and the diameter of the graduated cylinder can be made small so that the amount of change in the fluid can be accurately measured. An object of the present invention is to provide a device for measuring the expansion amount of an elastic member that can measure well.

[0012]

In order to achieve the above-mentioned object, the structure of the present invention has a first hollow elastic member for measurement on both sides.
A laser level meter that opens and closes the valve and the second valve, connects the first valve to a measuring cylinder filled with fluid, floats the float on the fluid in the measuring cylinder, and irradiates the float with a laser beam. It is characterized in that it is arranged above the graduated cylinder, and a fluid supply source is connected to the second valve.

[0013]

When the fluid in the elastic member is heated, the fluid and the elastic member expand, and when the stop valve on the graduated cylinder side is fully opened, the fluid corresponding to the amount of expansion enters the graduated cylinder to raise the floating position of the float.

In this state, when the laser beam is irradiated from the laser type level meter onto the float at an arbitrary angle, the laser beam is reflected and the distance is measured from the reflection angle to detect the expansion amount.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIG.

A stop valve 7 as a first valve and a stop valve 8 as a second valve are openably and closably provided on both sides of a rubber hose 6 as a hollow elastic member for measurement, and one stop valve 7 is connected via a circuit 10. Connected to a graduated cylinder 12 such as a glass tube, the other stop valve 8
Is connected via a circuit 9 to a fluid supply source such as long life coolant oil or water.

The stop valves 7 and 8 are a cylinder 21, a passage provided in the cylinder, and a poppet valve 2 for opening and closing the passage.
0, and the pressure fluid is selectively supplied to or discharged from the circuits 16, 17, 18, and 19 to fully open or fully close the poppet valve 20.

The graduated cylinder 12 has a graduated diameter 10
A transparent body having a diameter of less than or equal to millimeters is formed, a fluid is sealed inside, a float made of cork or the like is floated on the liquid surface, and an upper portion of the graduated cylinder 12 is opened.

The diameter of the graduated cylinder 12 is not limited to 10 mm or less, and may be more than 10 mm.

The scale can be visually confirmed. The graduated cylinder 12 is supported by the support base 11 and has a lower portion connected to the circuit 10 so as to communicate therewith.

A laser type level meter 14 is provided above the support base 11 so as to face the graduated cylinder 12 and irradiate the float 13 with a laser beam at an arbitrary angle. The laser beam may be irradiated vertically.

Next, the operation will be described.

First, the stop valve 7 on the graduated cylinder 12 side is fully closed, and the other stop valve 8 is fully opened to create a circuit 9
More fluid is supplied into the rubber hose 6 to be pressurized, and then the stop valve 8 is fully closed to seal the fluid in the rubber hose 6.

Next, the rubber hose 6 and the fluid inside are heated at a high temperature of about 100 to 200 degrees Celsius. Therefore, the fluid and the rubber hose 6 expand.

At this time, it is preferable that the fluid is expanded at the same rate as the rubber hose 6.

Next, when the stop valve 7 on the side of the graduated cylinder 12 is fully opened, the fluid expanded by the restoring force of the rubber hose 6 is introduced into the graduated cylinder 12 from the circuit 10 and the expanded float 13 is floated. Let

In this case, the floating amount of the float 13, in other words, the expansion amount can be confirmed by the scale on the scale, but the laser type level meter 14 is used to measure remotely and more accurately by an electric signal.

That is, the laser beam 15 is irradiated onto the float 13 from the laser level meter 14 at an arbitrary angle, and the reflection angle is measured to measure the distance between the float 13 and the laser level meter 14.

This distance is equal to the amount of expansion of the float 13 above the reference level, and as a result, the amount of expansion of the rubber hose 6 with respect to heat is measured.

Since the laser beam is used as the measuring means, the laser beam can be irradiated linearly, and even if the diameter of the measuring cylinder 12 is small, the laser beam can be irradiated onto the float reliably and accurately.

Further, since it is irradiated onto the float 13, the influence of the surface tension of the fluid is small, and it is not affected by the vapor generated from the fluid during heating.

The object to be measured can also be applied to synthetic resin hoses, diaphragms, accumulators and the like.

[0033]

The present invention has the following effects.

1) Since the float is irradiated with a laser beam and the distance is measured from the reflection angle to measure the expansion amount of the rubber hose or the like, it is possible to measure even if the diameter of the graduated cylinder is small.

Moreover, when the diameter of the graduated cylinder is small, the floating amount of the float becomes larger than that of a large diameter cylinder, which facilitates measurement and can be visually confirmed.

2) Since the laser beam is used, the measurement is not disturbed by the vapor generated when the fluid is heated.

3) Since the float is used, it is hardly affected by the surface tension of the fluid in the graduated cylinder.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a measuring device according to the present invention.

FIG. 2 is a circuit diagram showing a main part of a conventional measuring device.

[Explanation of symbols]

 6 Elastic member 7 1st valve 8 2nd valve 12 Measuring cylinder 13 Float 14 Laser type level meter 15 Laser beam

Claims (1)

[Claims] 1. A first valve and a second valve are provided on both sides of a hollow elastic member for measurement so as to be openable and closable, and a graduated cylinder in which a fluid is sealed is connected to the first valve, and A laser type level meter that floats the float on the float and irradiates the float with a laser beam is placed above the graduated cylinder.
An expansion amount measuring device for an elastic member, wherein a fluid supply source is connected to the second valve.