JPH0830685B2 - Differential thermal expansion measuring device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a differential thermal expansion measuring device for measuring a thermal expansion difference between a sample and a standard sample.

[Prior Art] FIG. 4 is a view showing a conventional differential thermal expansion measuring device.

In FIG. 4, one end of each of the sample 1 and the standard sample 2 formed in a rod shape is brought into contact with the support tube 3 fixed to the fixed portion, and the other ends thereof respectively contact one ends of the detection rods 4 and 5. It is touched. These detection rods 4 and 5 are supported by load applying means 6 and 7, respectively, and at the other end, the difference in the amount of movement of these detection rods in response to the thermal expansion of the sample 1 and the standard sample 2. Displacement detecting means 8 for detecting is attached. In this case, the load applying means 6 and 7 are rotatably attached to the detection rods 4 and 5 at the ends of one arm of each of the main balances 6b and 7b rotatably supported by the fixed fulcrums 6a and 7a. Together with the fixed fulcrum 6
Fixed rods 6c and 7c extending from a and 7a in parallel with the detection rods.
By providing one end of these fixed rods and the detection rod rotatably connected by connecting rods 6d, 7d arranged in parallel to the main balances 6b, 7b, the main balances 6b, 7b By placing the weights 6e, 7e on the end of the other arm, the detection rod
4,5 can be brought into contact with the sample 1 and the standard sample 2 with a desired pressing force (load).

Then, the sample 4 and the standard sample 5 are heated in the heating furnace 9, and the difference in thermal expansion between the sample 4 and the standard sample 5 is detected by the displacement detecting means 8.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional apparatus, two load applying means 6 and 6 are provided in order to bring the detection rods 4 and 5 into contact with the sample 1 and the standard sample 2 with a desired pressing force, respectively. 7 was required, the structure was complicated, and the operations were complicated, such as placing the two weights 6e and 7e separately.

An object of the present invention is to provide a differential thermal expansion measuring device which eliminates the above-mentioned drawbacks.

[Means for Solving Problems] The present invention forms a so-called link mechanism by connecting first and second detection rods that move according to thermal expansion of a sample and a standard sample with a plurality of connecting rods. , A supporting rod arranged in parallel to each of the detection rods passing through the middle point of each of the connecting rods is rotatably supported at the middle point of each of the connecting rods, and a load is applied to the supporting rod. By adding
One load applying means makes it possible to uniformly apply a pressing force to the sample and the standard sample through the respective detection rods. Specifically, one end of the sample and the standard sample arranged in parallel is used. Parts of the first and second detection rods arranged in parallel to the other ends of the sample and the standard sample, respectively, and these detection rods of the sample and the standard sample are in contact with each other. In the differential thermal expansion measurement device for measuring the difference in thermal expansion between the sample and the standard sample by detecting the difference in the amount of movement that moves in accordance with thermal expansion, the first and second detection rods are the samples. And a plurality of connecting rods are arranged in parallel so that they can move in parallel to each other according to the expansion of the standard sample, and both ends of each of the connecting rods are rotatably supported by the respective detection rods. In front of each midpoint of the rod A supporting rod arranged in parallel with each detection rod is provided to rotatably support the supporting rod at the midpoint of each connecting rod, and a load applying means for applying a force in the longitudinal direction of the supporting rod is provided. It has a configuration characterized by that.

[Operation] In the above configuration, the support rod, the detection rod, and the connecting rod form a so-called link mechanism, and the supporting rod is rotatably supported at the midpoint of each connecting rod. When a load is applied to the supporting rod by the load applying means, the force due to the load is evenly divided by the connecting rod into the first and second detection rods and applied to the sample and the standard sample. Can be held in contact with the fixed portion with the same pressing force. Moreover, in this case, even if the detection rods move due to the thermal expansion of the sample and the standard sample, the detection rods are always brought into contact with each other with the same pressing force and are maintained in parallel. The amount corresponds to the amount of thermal expansion of the sample and the standard sample, respectively. Therefore, the difference in thermal expansion between the sample and the standard sample can be measured by measuring the difference in the amount of movement between these two detection rods.

[Embodiment] FIG. 1 is a view showing an embodiment of the present invention.

In FIG. 1, the rod-shaped sample 11 and the standard sample 12 have their upper ends abutted on a support tube 13 fixed to a fixed portion E, and their lower ends have first and second detection rods 14 respectively. And 15 are respectively brought into contact with the upper end portions of and are supported substantially in parallel. These detection rods 14 and 15 are arranged substantially vertically, and are connected by two connecting rods 16 and 17.
That is, the connecting rods 16 and 17 are arranged in parallel at a certain distance, and both ends of each are connected to the first and second ends.
Is rotatably supported by the detection rods 14 and 15. The coil portion 18a of the differential transformer 18 serving as a displacement detecting means is attached to the lower end portion of the first detection rod 15, and the iron core (core) of the differential transformer is attached to the lower end portion of the second detection rod 15. )
It is attached to 18b.

Further, a supporting rod 19 arranged in parallel with each of the detecting rods 14 and 15 is rotatably supported at a middle point of each of the connecting rods 16 and 17, and the supporting rod 19 is supported by a load applying means 20. ing. That is, this load applying means 20,
A main balance 20b rotatably supported by a fixed fulcrum 20a, a fixed rod 20c extending from the fixed fulcrum 20a in parallel with each of the detection rods 14 and 15, and a right end of the fixed rod 20c at the upper end in the drawing. The main rod 20b is rotatably supported by a movable rod 20d, and the lower end of the support rod 19 is rotatably attached to the left end of the main balance 20b in the figure, while the movable rod 20d.
The upper end of the support rod 19 is rotatably attached to the left end in the figure of d. The support tube 13 is housed in a heating furnace 21, and the heating furnace 21 allows the sample 11
Also, the standard sample 12 can be heated.

According to the above configuration, the weight 20e having an appropriate weight is placed on the right end portion of the main balance 20b in the drawing, whereby the support rod 1
The upper ends of the detection rods 14 and 15 can be brought into contact with the lower ends of the sample 11 and the standard sample 12 with appropriate pressing force (load) through the connection rod 9 and the connecting rods 16 and 17, respectively. Also, the standard sample 12 can be held between the support tube 13 and the detection rods 14 and 15. Further, in this case, the respective detection rods 14 and 15 are connected by the connecting rods 16 and 17 to form a so-called link mechanism, and the respective middle points of these connecting rods are rotatably supported by the support rods 19. Therefore, the force applied by the support rod 19 is
The sample is always in a uniform and parallel direction via 14 and 15.
11 and standard sample 12 are applied. Moreover, the support rod 19
Is always applied in the vertical direction by a so-called link mechanism composed of the movable rod 20d of the load applying means 20, the fixed rod 20c, and the main balance 20b, so that the sample 11 and the standard sample 12 are always pressed in the vertical direction ( Load) is applied.

Therefore, when the sample 11 and the standard sample 12 are now heated by the heating furnace 21, the detection rods 14 and 15 are lowered in accordance with their thermal expansion. At this time, when there is no difference in thermal expansion between the sample 11 and the standard sample 12, both detection rods move by exactly the same distance, so that the displacement detecting means 18 does not detect any displacement. On the other hand, when the sample 11 and the standard sample 12 have a difference in thermal expansion, as shown in FIG.
There is a difference in the amount of movement with ΔL from 15, and this is detected by the detection means 18. As a result, the differential thermal expansion between the sample 11 and the standard sample 12 can be measured.

According to the above embodiment, only one load applying means is required,
The structure can be simplified as compared with the conventional case where two load applying means are required, and the device can be set by one load applying operation, so that the operation is easy.

 FIG. 3 is a diagram showing another embodiment of the present invention.

This embodiment is, in short, a modified example in which the one embodiment is installed horizontally, and since the main part configuration is the same as the one embodiment, the same parts are denoted by the same reference numerals and detailed description thereof will be given. Omit it.

In FIG. 3, in this embodiment, the sample 11 is attached to the support tube 13.
Further, mounting bases 13a and 13b for mounting the standard sample 12 are provided. Further, both ends of the horizontally arranged support rod 19 are rotatably attached to the lower ends of the two movable rods 31 and 32, and the upper ends of the movable rods 31 and 32 are respectively attached to the semi-fixed piece 33. It is rotatably attached. The semi-fixed piece 33 is semi-fixedly movably attached along the groove 34a provided in the fixed portion 34. That is, the support rod 19 is thereby movable in the horizontal direction. Further, a right end portion of the support rod 19 in the figure is bent upward to form a bent portion 19a, and one end portion of a lever 35a of the load applying means 35 is in contact with the bent portion 19a. The lever 35a is rotatably supported at its center by a fixed fulcrum 35b, and a weight 35c is placed on the other end to horizontally push the supporting rod 19 to the sample 11 and the standard sample 12. A desired pressing force (load) is applied.

This embodiment also has the same advantages as the above-mentioned one embodiment.

In each of the above-mentioned embodiments, the load applying means is constituted by a mechanical means. However, it goes without saying that this may be constituted by an electric means in which an electromagnetic coil and a magnet are combined. .

[Effects of the Invention] As described in detail above, the present invention provides a so-called link mechanism in which the first and second detection rods that move according to the thermal expansion of the sample and the standard sample are connected by a plurality of connecting rods. A support rod is provided which is arranged parallel to each of the detection rods and which passes through the middle point of each of the connecting rods, and rotatably supports the support rod at the middle point of each of the connecting rods. By applying a load to the sample, it is possible to uniformly apply a pressing force to the sample and the standard sample through each of the detection rods by one load applying means. The effect of improving the operability while enabling simplification.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention, FIG. 2 is a diagram for explaining the operation of the embodiment of the present invention, FIG. 3 is a diagram showing another embodiment of the present invention, and FIG. The figure shows a conventional example of the present invention. 11 …… Sample, 12 …… Standard sample, 13 …… Support tube, 14 …… First detection rod, 15 …… Second detection rod, 16,17 …… Connecting rod, 1
8 …… Displacement detection means, 20, 35 …… Load application means, E …… Fixed part.

Claims (1)

[Claims] 1. One of the first and second detection rods arranged in parallel with the other end of each of the sample and the standard sample by abutting one end of the sample and the standard sample in parallel with a fixed portion. Differential thermal expansion that measures the difference in thermal expansion between the sample and the standard sample by contacting one end and detecting the difference in the amount of movement of these detection rods according to the thermal expansion of the sample and the standard sample. In the measuring device, a plurality of connecting rods are arranged in parallel so that the first and second detection rods can move in parallel to each other according to the expansion of the sample and the standard sample, and both ends of each of the connecting rods are arranged. Is rotatably supported on each of the detection rods, and further provided with a support rod which is arranged in parallel with each of the detection rods and passes through the middle point of each of the connecting rods, and the support rod is attached to the middle point of each of the connecting rods. It is rotatably supported and the support rod Differential thermal expansion measuring apparatus characterized in that a load applying means for applying a force to the longitudinal direction.