JP5492945B2 - Measuring device for subject under specific temperature - Google Patents

Description

  The present invention provides a space temperature adjusting means for freely adjusting the temperature of the internal space surrounded by the heat insulating wall, and also provides an installation section for installing the subject in the internal space, so that a predetermined test situation is provided to the subject. A test chamber provided with a test chamber provided with a see-through window capable of seeing through the internal space from an external space, and provided with a measuring device for measuring a subject installed in the installation section The present invention relates to a measurement apparatus for a subject in

  Conventionally, in the measurement apparatus, various tests are performed in an atmosphere adjusted by the space temperature adjusting means, and the object in the installation portion in the internal space is measured with a measuring instrument, for example, in a tensile test. Perform contact-type measurement methods such as attaching a jig to the specimen and measuring with a displacement gauge, attaching a strain gauge to the specimen, and measuring with a strain gauge, or extending the video by attaching a standard line to the specimen. Measurement is performed by a non-contact optical measuring instrument such as a meter (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 11-295041

  However, in measuring with a displacement meter, it takes a lot of time to attach jigs and set the displacement meter at room temperature, and it becomes difficult to operate the displacement meter at extremely low temperatures. In addition, in the measurement with a strain gauge, there is a problem that the strain gauge itself has strength, and in a tensile test of a weak material such as urethane heat insulating material, an accurate measurement value is not obtained depending on the strength of the strain gauge. In addition, it takes time to attach the strain gauge to the subject, and the strain gauge and lead wire are hard and easily deteriorated at extremely low temperatures, resulting in an expensive measurement method.

In addition, measuring with the above-mentioned non-contact optical measuring instrument has the advantage that it can be measured efficiently, but it is necessary to measure from the outside of the test tank through the fluoroscopic window. In this case, there is a problem that stable visualization becomes difficult and the measurement accuracy of the optical measuring instrument is lowered.
In other words, due to the heat conduction of the fluoroscopic window, the heat energy transmitted from the outside on the inner surface of the fluoroscopic window heats the air in contact with the surface and lowers its density, producing a large density difference from the inner air. To do.
Therefore, a fluctuation phenomenon occurs near the inner surface of the transparent window.
Similarly, also on the outer surface of the see-through window, the air contacting the outer surface is cooled by the cold heat transmitted through the see-through window, the density thereof increases, and a large density difference from the outside air occurs.
Therefore, the fluctuation phenomenon occurs near the outer surface of the transparent window.
In addition, there is a problem that condensation may occur on the outer surface of the transparent window if the humidity of the outer space is high.

  The present invention has been invented by discovering the above phenomenon, and an object of the present invention is to provide a measuring apparatus capable of solving the above problems and performing stable measurement with high accuracy even at a specific temperature.

  The first characteristic configuration of the present invention provides a test tank that surrounds the internal space with a heat insulating wall, provides an installation part for installing the subject in the internal space, and gives a predetermined test situation to the subject in the installation part Provided with a testing machine, a space temperature adjusting means for adjusting the temperature of the internal space to a low temperature, a transparent window capable of seeing through the inside of the internal space from an external space, and installed in the installation section. An optical measuring instrument that measures the measured object through the fluoroscopic window is provided outside the test chamber, and a first fan that blows the gas in the internal space onto the inner surface of the fluoroscopic window is disposed inside the fluoroscopic window. And a second fan that blows the gas in the external space onto the outer surface of the see-through window is provided outside the see-through window.

According to the first characteristic configuration of the present invention, in order to perform a predetermined test on a subject under a specific temperature, the temperature is adjusted to a specific temperature by the space temperature adjusting means in a state of being installed in the installation section in the test tank. And test with a testing machine.
When the state changed by the test is measured with an optical measuring instrument from the outside through the fluoroscopic window, a first fan for blowing the gas in the internal space to the inner surface of the fluoroscopic window is provided inside the fluoroscopic window. The second fan for blowing the gas in the external space to the outer surface of the fluoroscopic window is provided on the outer surface of the fluoroscopic window, so that the inner surface of the fluoroscopic window is heated by the heat transmitted from the outside as described above. The air layer having a low density is blown away by the first fan, and the density difference between the air near the inner surface of the viewing window and the air inside can be reduced.
Therefore, it is possible to suppress the occurrence of the fluctuation phenomenon near the inner surface of the transparent window.
Similarly, on the outer surface of the see-through window, the air layer near the outer surface that has been cooled by the see-through window and has an increased density is blown away by the second fan, and the density difference from the outside air can be reduced.
Therefore, the occurrence of the fluctuation phenomenon near the outer surface of the transparent window can be suppressed.
Therefore, it is possible to stably and accurately measure the change of the subject in the test tank by the optical measuring instrument.

  The second characteristic configuration of the present invention is that a heating means for heating the outer surface of the see-through window is provided.

According to the second characteristic configuration of the present invention, in addition to being able to achieve the above-described operation and effect of the first characteristic configuration of the present invention, the outer surface of the viewing window is heated by the heating means, thereby Even if the humidity of the space is large, it is possible to prevent condensation on the surface of the see-through window.
Therefore, visualization in the test tank can be performed stably, and the measurement accuracy by the optical measuring instrument can be maintained high.

  According to a third characteristic configuration of the present invention, the tester is selected from a tensile tester, a linear shrinkage tester, a bending tester, a compression tester, and a shear tester of a subject, The optical measuring instrument is selected from thermography, shape recognition device displacement measuring instrument, and video extensometer.

  According to the third characteristic configuration of the present invention, the test of the object by the test machine selected from the tensile tester, the linear shrinkage tester, the bending tester, the compression tester, and the shear tester is performed on the optical test. The type measuring machine selected from thermography, shape recognition device displacement amount measuring machine, and video extensometer can stably measure from the outside of the test tank without contact.

  According to a fourth characteristic configuration of the present invention, the see-through window is composed of one or a combination of a plurality of types selected from a transparent resin plate, vacuum glass, and multilayer glass.

  According to the 4th characteristic structure of this invention, a test | inspection tank is comprised by what comprised the transparent window by the 1 type selected from the transparent resin plate, the vacuum glass, and the multilayer glass, or the combination of multiple types. The heat conduction between the inside and the outside can be easily suppressed, the driving energy of the first fan and the second fan can be suppressed, and the economy can be improved.

  According to a fifth characteristic configuration of the present invention, an illumination device that illuminates an internal space through the see-through window is disposed in the external space.

  According to the fifth characteristic configuration of the present invention, by illuminating the internal space with the illumination device, measurement of the test state of the subject in the test tank can be performed with more stable accuracy. In addition, by arranging the lighting device in the external space, the internal space is not affected by the heat generated from the lighting device, and the adjustment and maintenance of the space temperature in the test chamber can be performed stably.

It is a vertical side view of the measuring device of the present invention. It is a principal part perspective view of this invention. (A) is a side view of a 1st fan, (b) is a partially notched side view of a 2nd fan.

Embodiments of the present invention will be described below with reference to the drawings.
As shown in FIGS. 1 to 3, a tester 3 (for example, a tensile tester) that provides a predetermined test situation to the subject 1 in the installation unit 2 while providing an installation unit 2 for installing the subject 1 in the internal space. , A linear shrinkage tester, a bending tester, a compression tester, a shear tester), a space temperature adjusting means 4 for adjusting the temperature of the internal space to a low temperature, and surrounding the internal space with a heat insulating wall 8 for constant temperature. The test tank 5 that can maintain the state is configured.

In the present embodiment, a coolant such as liquid nitrogen is supplied to the inside of the test tank 5 formed by the heat insulating wall 8 in which the inner wall of the stainless steel plate 7 (SUS) is integrally formed on the inner surface of the urethane foam layer 6. For example, a space temperature adjusting means 4 that makes the space an atmosphere at an extremely low temperature of −150 ° C. or less is provided, and a tensile tester is provided as the tester 3. A see-through window 9 to which an acrylic resin plate is attached is provided.
A marked gauge 10 is formed on the plate-like subject 1 attached to the tensile testing machine, and a change in the position of the marked gauge 10 is measured from the outside through the fluoroscopic window 9 and the elongation based on the tensile test is measured. In order to obtain the change value, a video extensometer is arranged as an optical measuring instrument 11 outside the test tank 5.

Inside the test chamber 5, a first fan 12 that blows the gas in the internal space to the inner surface of the transparent window 9 is provided inside the transparent window 9, and the gas in the external space is applied to the outer surface of the transparent window 9. The second fan 13 to be blown is provided outside the fluoroscopic window 9 and is formed near both the front and back surfaces of the fluoroscopic window 9. Unlike the space, a high-density air layer is formed, and in the vicinity of the inner surface of the transparent window 9, a low-density air layer is formed unlike most of the internal space). 13 prevents the fluctuation phenomenon that occurs near the surface of the fluoroscopic window 9 by being blown off by the optical sensor 13, and the measurement with the optical measuring instrument 11 prevents condensation that occurs by heating the outer surface of the fluoroscopic window 9 with high accuracy and stability. Heater H as a heating means for the second, While attached to § emissions 13, also functions are allowed with a transparent window 9 in hot air to blow warm air blowing device 14 (see FIG. 1, Figure 3 (b)).
As shown in FIG. 1 and FIG. 2, an illuminating device 15 composed of LEDs that illuminate the internal space through the fluoroscopic window 9 is disposed outside the fluoroscopic window 9, and changes based on various tests of the subject 1 are measured. Easy to use.
Further, outside the illumination device 15, the light leakage prevention plate 18 covers the illumination device 15 in order to prevent light from the LED from leaking to the optical measuring instrument 11 side and causing an obstacle to measurement.

  As shown in FIG. 3A, the motor 16 of the first fan 12 is covered with a heat insulating material 17, and a temperature control heater (not shown) is provided to prevent the motor 16 from becoming 0 ° C. or lower. Thus, the drive rotation in the cryogenic atmosphere is prevented from stopping.

[Another embodiment]
Other embodiments will be described below.
<1> In place of the transparent acrylic resin plate, the transparent window 9 is provided with another transparent resin plate and a plurality of plate glasses in a state where a gap is opened via a spacer, and the space in the gap is evacuated. Vacuum glass that is in a sealed state, a plurality of sheet glasses are provided side by side through a spacer, and between these sheet glasses, double-layer glass in which dry air from which moisture has been removed to prevent condensation is contained, It may be composed of a combination of one or more of them, and various materials can be used as long as they are transparent and heat conduction between the front and back surfaces is kept low.
<2> Instead of being attached to the second fan 13 as the heating means, the hot air blowing device 14 may be provided as a separate member from the second fan 13.
<3> Instead of the hot air blowing device 14 as the heating means, a conductive transparent heating element is provided on the outer surface of the see-through window 9 so that the temperature of the see-through window 9 itself can be raised to prevent condensation. Also good.

  In addition, as mentioned above, although the code | symbol was written in order to make contrast with drawing convenient, this invention is not limited to the structure of an accompanying drawing by this entry. In addition, it goes without saying that the present invention can be carried out in various modes without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Subject 2 Installation part 3 Test machine 4 Spatial temperature adjustment means 5 Test tank 8 Heat insulation wall 9 See-through window 11 Optical measuring device 12 1st fan 13 2nd fan

Claims (5)

A test chamber that surrounds the internal space with a heat insulating wall is provided.
While providing an installation unit for installing the subject in the internal space,
A testing machine for providing a predetermined test situation to the subject in the installation unit is provided,
Space temperature adjusting means for adjusting the temperature of the internal space to a low temperature is provided,
The test chamber is provided with a see-through window through which the inside space can be seen from the outside space,
An optical measuring instrument that measures the subject installed in the installation section through the fluoroscopic window is provided outside the test tank,
A first fan for blowing the gas in the internal space to the inner surface of the fluoroscopic window is provided inside the fluoroscopic window,
An apparatus for measuring a subject under a specific temperature, wherein a second fan that blows gas in the external space onto the outer surface of the fluoroscopic window is provided on the outer side of the fluoroscopic window.   The apparatus for measuring a subject under a specific temperature according to claim 1, wherein heating means for heating the outer surface of the fluoroscopic window is provided.   The test machine is selected from a tensile test machine, a linear shrinkage test machine, a bending test machine, a compression test machine, and a shear test machine, and the optical measuring machine is a thermography and shape recognition device. The measuring device for a subject under a specific temperature according to claim 1 or 2, wherein the measuring device is selected from a displacement measuring instrument and a video extensometer.   The said transparent window consists of what was selected from the transparent resin plate, the vacuum glass, and the multilayer glass, or a combination of a plurality of types, at a specific temperature according to any one of claims 1 to 3. A measuring device for a subject. The measurement apparatus for a subject under a specific temperature according to claim 1, wherein an illuminating device that illuminates an internal space through the fluoroscopic window is disposed in the external space.

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