JPH0795048B2 - Thermal expansion coefficient measuring device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a thermal expansion coefficient measuring device, and more particularly to a thermal expansion coefficient measuring device used for linear glass.

(Prior Art) As an example of a conventional thermal expansion coefficient measuring device, for example, a structure having a structure as shown in FIG. 3 is known.

This conventional thermal expansion coefficient measuring device 1 includes a fixed part 2, a pair of movable parts 3 (3a, 3b) for holding a standard sample A and a measured sample W between the fixed part 2 and both movable parts. 3 (3a,
3b) and a differential transformer 4 for detecting the relative amount of movement of the two, and the movable part 3 (3a, 3b) connected to the movable part 3 (3a, 3b). Holding force adjusting means 5 (5a, 5) for adjusting the holding force applied from the above to each sample A, W
b) and a heater H for heating the samples A and W, and the holding force adjusting means 5 (5a, 5b) is a lever 6 (6a, 6b) rotatably arranged around the branch S. And this lever 6 (6a, 6
Balun weight 7 (7a, 7b) provided at one end of b)
And a balance weight 8 (8a, 8b) for fine adjustment provided in the vicinity of the balance weight 7 (7a, 7b). The movable portion is provided at the other end of the lever 6 (6a, 6b). 3 (3
a, 3b) are engaged.

The thermal expansion coefficient measuring device 1 holds the standard sample A and the measurement sample W between the fixed part 2 and each movable part 3 (3a, 3b), and also each balance weight 7
(7a, 7b), 8 (8a, 8b) is adjusted so that the holding force acting on each sample A, W from the movable part 3 (3a, 3b) becomes zero, and then each sample A, W is adjusted by the heater H. The differential transformer 4 electrically heats W, and the difference in the amount of elongation between the two samples A and W caused by this heating is used as the relative movement amount between the movable parts 3 (3a, 3b) holding them. Then, the thermal expansion coefficient of the measurement sample W is calculated from this data and the characteristics of the standard sample A.

(Problems to be Solved by the Invention) In the thermal expansion coefficient measuring device 1 described above, a balance structure including a lever 6 and balance weights 7 and 8 is used for adjusting the holding force applied to each sample A and W. Therefore, in particular, when the displacement amount of the measurement sample W is large, the holding force set on the measurement sample W changes due to the large rotation amount of the lever 6, and the movable portion 3 (3a, 3b) Is inclined and the line of action of the holding force and the extending direction of the measurement sample W are deviated.

Therefore, the measurement sample having a large displacement amount and the measurement after the softening point are limited.

Further, since the holding force 6 must be set horizontally for setting the holding force, the fixed portion 2 and the movable portion 3 (3a, 3)
The distance between b) is naturally regulated.

As a result, the shape of the measurement sample W is also limited, and it becomes difficult to apply it to a long sample.

In particular, in the measurement requiring accuracy, changes in the above-mentioned various conditions must be strictly controlled, and therefore the shapes of the standard device A and the measurement sample W must be prepared in conformity with the fixed shape, and the work required for the measurement is complicated. There is a problem that it becomes.

The present invention has been made to solve such a problem, and facilitates measurement of a long linear sample, simplifies the work required for measurement, and enables thermal expansion other than the softening point. An object is to provide a coefficient measuring device.

(Means for Solving the Problems) In the present invention, in order to achieve the above-mentioned object, a fixed part fixed to the apparatus main body, and a linear measurement sample is held between the fixed part and the linear measurement sample. Sample holding means composed of a movable part that is moved in the direction of expansion and contraction according to the amount of expansion and contraction, movement amount detection means connected to the movable part to detect the amount of movement, and from the movable part to the measurement sample. Holding force adjusting means for adjusting the holding force applied, wherein the holding force adjusting means has a lever comprising a rotation fulcrum and a fixed fulcrum, and the lever is fixed by a balance weight provided at one end thereof. It rotates about a fulcrum as an axis, and a holding force is applied to the movable portion via a rotation fulcrum located at the other end of the lever,
The thermal expansion coefficient measuring device, wherein the rotation fulcrum moves in accordance with the vertical movement of the lever and is rotated to hold the movable portion in parallel with the longitudinal direction of the measurement sample.

(Operation) The thermal expansion measuring device of the present invention adjusts the holding force applied to the linear measurement sample by an upward external force generated by the balance weight provided at one end of the lever via the pivot point. In addition to the movable part, this holds the magnitude and direction of the holding force applied to the measurement sample irrespective of the moving position of the movable part, and expands the movable range of the movable part. It is a thing.

(Example) Hereinafter, an example of the present invention will be described with reference to FIG.

In FIG. 1, reference numeral 9 indicates a thermal expansion measuring device according to this embodiment, which holds a linear measurement sample W between a fixed part 10 fixed to the device main body A and the fixed part 10, and A moving amount detecting means 19 connected to a movable part 11 that is moved in the expansion / contraction direction according to the expansion / contraction amount of the linear measurement sample W to detect the movement amount, and the linear measurement sample from the movable part 11 And a holding force adjusting means 12 for adjusting the holding force applied to W,
The holding force adjusting means 12 includes a lever 13 fixed to the apparatus body A, a balance weight 14 provided at one end of the lever 13, and a fine adjustment provided at an intermediate portion between the lever 13 and the balance weight 14. It has a basic structure consisting of 15 auxiliary balance weights.

Next, these will be described in detail.
Is a support tube 16 fixed to the apparatus main body A along the vertical direction.
And a disc-shaped support plate 17 fixed above the support pipe 16 (upper part in the figure). This support plate 17
Has 20 fixing notches 18 for holding one end (upper end) of the linear measurement sample W, and the movable portion 11 is formed immediately below the fixing notch, and the linear sample W A movable part 11 composed of a detection rod locked to the other end (lower end) of the is movable up and down.

Then, the rotation fulcrum S1 of the lever 13 that constitutes the holding force adjusting means 12 is attached to the lower end of the movable portion 11 so that the movable portion 11 does not tilt even when the lever 13 rotates. is there.

Further, the auxiliary balance weight 15 provided between the lever 13 and the balance weight 14 allows the linear measurement sample W to be applied with an appropriate load.

As the moving amount detecting means 19, a differential transformer 19 is used in this embodiment, and a core 21 of the differential transformer 19 is attached to a fulcrum S1 provided under the movable portion 11 so that the movable portion is movable. It is movable up and down together with 11, and the field 20 of the differential transformer 19 is fixed to the apparatus main body A. Therefore, when the fixed portion 10 and the movable portion 11 move relative to each other, the movement causes the core 21 and the field 20 to move.
The relative movement with and is done at the same time.

In FIG. 1, a detailed view of the holding force adjusting means indicated by reference numeral 12 is shown in FIG.

In FIG. 2, the holding force adjusting means 12 has a lever 13 composed of a rotation fulcrum S1 and a fixed fulcrum S2, and the lever 13 is adapted to be vertically rotated about the fixed fulcrum S2. That is, the movable fulcrum 11 is always vertical with respect to the apparatus main body A because the pivotal fulcrum S1 also moves following the vertical movement of the lever 13 and the fulcrum S1 is pivotable. It is kept.

A balance weight is attached to the other end of the lever 13 having the above structure.
By providing 14 and moving the balance weight 14 back and forth, adjustment is performed so as to balance with the weight of the core 21 and the movable portion 11 of the movement amount detecting means 19.

Further, by moving the auxiliary balance weight 15 provided on the upper part of the lever to the left and right, an appropriate load can be applied to the linear measurement sample W.

The thermal expansion coefficient measuring device 9 of the present embodiment configured as described above
The procedure for measuring the coefficient of thermal expansion will be described below.

First, the auxiliary balance weight 15 is moved to the fixed fulcrum S2 side, and the balance weight 14 is moved back and forth to achieve balance. As a result, the holding force of the sample holding means 12 is once set to zero, and then the auxiliary balance weight 15 is moved to the rotation fulcrum S1 side to apply a constant load.

Then, the linear measurement sample W is mounted between the fixed part 10 and the movable part 11.

In this state, the heater H is driven to drive the linear measurement sample W.
To a predetermined temperature.

By such an operation, the movable portion 11 is pushed down in accordance with the thermal expansion of the linear measurement sample W, and the core 21 is also pushed down and moved relative to the field 20.
When the core 21 and the field 20 are moved relative to each other, the amount of this movement is electrically detected as the amount of thermal expansion of the linear measurement sample W under the heating temperature.

Then, the thermal expansion coefficient of the linear measurement sample W is calculated by correcting the measurement result by the calculation in consideration of the mechanical characteristics.

When measuring such a coefficient of thermal expansion, the expansion and contraction direction of the linear measurement sample W and the acting direction of the holding force applied to the linear measurement sample W are substantially in line with each other. Regardless of the above, a constant holding force is applied to the linear measurement sample W from a constant direction.

Therefore, the moving amount of the movable portion 11 can be made large,
It enables effective measurement of long objects.

Further, even when the characteristics of the linear measurement sample W itself or a large change such as when reaching the viscous flow region past the softening point, the allowable movement amount of the movable portion 11 is large, and
As described above, since various conditions at the time of setting are held substantially constant regardless of the moving position of the movable portion 11, it is possible to measure in a wide displacement range.

Further, since processing of the sample is unnecessary, the labor required for the inspection process can be reduced, and the measurement operation can be simplified.

Although two linear measurement samples W are shown in FIG. 1, at least four samples can be simultaneously measured by mounting samples around the support plate 17.

(Effects of the Invention) As described above, according to the present invention, as a means for adjusting the holding force with respect to a sample, a lever having a rotation fulcrum and a fixed fulcrum is provided, and the lever is associated with the fixed fulcrum as an axis. Since the holding force is applied to the movable portion via the rotation fulcrum, the following excellent effects can be obtained.

The rotation fulcrum can be moved and held in the movable part without being tilted, and the movable part can be held parallel to the longitudinal direction of the measurement sample. Therefore, the magnitude of the holding force applied to the sample, the direction of action, etc. As a result, the movable range of the movable part can be expanded to measure a sample with a large amount of displacement, or a viscous flow region past the softening point, etc. By reducing the processing to the sample, the measurement operation can be simplified.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of the present invention, FIG. 2 is an explanatory view of the holding force adjusting means in FIG. 1, and FIG. 3 is a schematic view showing a conventional structure example. A: device body, W: linear measurement sample, 10: fixed part, 11: movable part, 12: holding force adjusting means, 13: lever, 19: moving amount detecting means, S1: Rotation fulcrum, S2 ... Fixed fulcrum

Claims (1)

[Claims] 1. A fixed part fixed to an apparatus main body, and a movable part which holds a linear measurement sample between the fixed part and the movable part in the expansion / contraction direction according to the expansion / contraction amount of the linear measurement sample. A sample holding means composed of a moving part, a moving amount detecting means connected to the movable part for detecting the moving amount thereof, and a holding force adjusting means for adjusting the holding force applied from the movable part to the measurement sample. The holding force adjusting means has a lever composed of a rotation fulcrum and a fixed fulcrum, and the lever is rotated about the fixed fulcrum by a balance weight provided at one end thereof, and the other end of the lever is provided. A holding force is applied to the movable portion via the rotation fulcrum positioned at, the rotation fulcrum moves in accordance with the vertical movement of the lever, and the rotation fulcrum rotates to move the movable portion of the measurement sample. Thermal expansion characterized by being held parallel to the longitudinal direction Number measuring device.