JPH01142446A - Apparatus for measuring differential thermal expansion - Google Patents

Abstract

PURPOSE:To simplify a structure and to facilitate measuring operation, by applying load to two detection rods brought into contact with a specimen and a standard specimen by one load applying means through a link mechanism. CONSTITUTION:A rod-shape specimen 11 and a standard specimen 12 are brought into contact with a support pipe 13 and supported in the state brought into contact with detection rods 14, 15 at the lower end parts thereof. The detection rods 14, 15 are connected by connection levers 16, 17, and the coil part 18a and iron core 18b of a differential transformer 18 being a displacement detection means are mounted to the lower end parts of the detection rods 14, 15. A support lever 19 is supported at the middle points of the connection levers 16, 17 and further supported by a load applying means 20. The load applying means 20 applies the load due to a wt. 20e to the specimen 11 and the standard specimen 12 by a link mechanism constituted of the main balance 20b supported at a fixing fulcrum 20a, a fixed lever 20c and a movable lever 20d. In measurement, the output of the detection means 18 at the time of heating in a heating furnace is calculated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a differential thermal expansion measuring device that measures the difference in thermal expansion between a sample and a standard sample.

[Conventional technology] FIG. 4 is a diagram showing a conventional differential thermal expansion measuring device.

In FIG. 4, one end of a sample 1 and a standard sample 2 each formed in a rod shape is in contact with a support tube 3 fixed to a fixed part, and the other end is in contact with one end of detection rods 4 and 5, respectively. being touched. These detection rods 4 and 5 are supported by load application means 6 and 7, respectively, and the difference in the amount of movement of these detection rods according to the thermal expansion of the sample 1 and the standard sample 2 is shown at the other end. Displacement detection means 8 for detecting is also housed therein. In this case, the load applying means 6 and 7
The detection rods 4 and 5 are rotatably attached to the end of one arm of each of the main balances 6b and 7b, which are both rotatably supported by the fixed supports 6a and 7a, and the Fixing rods 6c and 7c are provided that extend parallel to each detection rod, and one end of these fixed rods and the detection rod can be freely rotated by connecting rods 6d and 7d arranged parallel to the main balances 6b and 7b. By placing weights 6e and 7e on the ends of the other arms of the main balances 6b and 7b, the detection rod 4.5 can be pressed against the sample 1 and standard sample 2 in a desired manner. pressure (load)
It is designed so that it can be brought into contact with the

Then, the sample 4 and the standard sample 5 are heated in a 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 conventional device, two load applying means 6 and 5 are used to bring the detection rods 4 and 5 into contact with the sample 1 and the standard sample 2 with desired pressing forces, respectively. 7 is required,
The structure was complicated, and the operation was also complicated, as the two weights 6e and 7e were placed separately.

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

[Means for Solving the Problems] The present invention comprises a so-called link mechanism in which first and second detection rods, which move in accordance with the thermal expansion of the sample and the standard sample, are linked by a plurality of linking rods. , a support rod is provided that passes through the center point of each of these connecting rods and is arranged parallel to each of the detection rods, and the support rod is rotatably supported at the center point of each of the connection rods, and a load is applied to the support rod. By adding 1
It is possible to apply pressing force equally to the sample and the standard sample through each of the detection rods using two load applying means, specifically, to one end of the sample and the standard sample arranged in parallel. are brought into contact with the fixed part, and one ends of first and second detection rods arranged parallel to each other are brought into contact with the other ends of the sample and the standard sample, and these detection rods absorb the heat of the sample and the standard sample. By detecting the difference in the amount of movement according to expansion,
In the differential thermal expansion measuring device that measures the difference in thermal expansion between the sample and the standard sample, the first and second detection rods are arranged in plurality so that they can move in parallel to each other in accordance with the expansion of the sample and the standard sample. The connecting rods are arranged in parallel, and both ends of each of these connecting rods are rotatably supported by each of the detection rods, and further, the connecting rods are arranged parallel to each of the detection rods, passing through the midpoint of each of the connecting rods. A support rod is provided, the support rod is rotatably supported at the midpoint of each of the connecting rods, and a load applying means for applying force in the longitudinal direction of the support rod is provided. .

[Function] In the above configuration, the support rod, the detection rod, and the connecting rod constitute a so-called link mechanism, and since the support rod is rotatably supported at the midpoint of each connecting rod, the above-mentioned When a load is applied to the support rod by the load application means, the resulting force is equally divided between the first and second detection rods by the connecting rod and applied to the sample and the standard sample. can be held in contact with the fixing part with the same pressing force. Moreover,
In this case, even if the detection rods move due to the thermal expansion of the sample and standard sample, the detection rods are always brought into contact with the same pressing force and are maintained in parallel, so the amount of movement of both detection rods is Each corresponds to the amount of thermal expansion of the sample and standard sample.

Therefore, by measuring the difference in the amount of movement of both detection rods, it is possible to measure the difference in thermal expansion between the sample and the standard sample.

[Example] FIG. 1 is a diagram showing an embodiment of the present invention.

In FIG. 1, a sample 11 and a standard sample 12 each formed into a rod shape have their upper ends abutted on a support tube 13 fixed to a fixing part E, and their lower ends contact the first and second detection rods 14. and 15, respectively, and are supported substantially parallel to each other. These detection rods 14 and 15 are arranged substantially vertically, respectively, and are connected by two connecting rods 16 and 17. That is, these connecting rods 16 and 17 are arranged in parallel at a certain distance, and both ends of each are rotatably supported by the first and second detection rods 14 and 15. A coil portion 1 of a differential transformer 18 serving as a displacement detecting means is attached to the lower end of the first detection rod 15.
8a is attached to the lower end of the second detection rod 15, which is attached to the iron core 18b of the differential transformer.

Further, at the midpoint of each of the connecting rods 16 and 17, a support rod 1 is arranged parallel to each of the detection rods 14 and 15.
9 is rotatably supported, and this support rod 19 is supported by a load applying means 20. That is, this load applying means 20 includes a main balance 20b rotatably supported on 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 this fixed rod. It consists of a movable rod 20d whose right end in the figure is rotatably supported at the upper end of the main balance 20C, and the lower end of the support rod 19 is rotatably attached to the left end in the figure of the main balance 20b. On the other hand, the upper end of the support rod 19 is rotatably attached to the left end in the figure of the movable rod 20CI. Note that the support tube 13 is housed in a heating furnace 21, and the sample 1 is heated by the heating furnace 21.
1 and the standard sample 12 can be heated.

According to the above configuration, by placing a weight 20e of an appropriate weight on the right end portion of the main balance 20b in the figure, the detection rod 14.
The upper end of the sample 11 and the standard sample 12 can be brought into contact with the lower ends of the sample 11 and the standard sample 12 with an appropriate pressing force (load), and the sample 11 and the standard sample 12 can be brought into contact with the support tube 13.
and the detection rods 14 and 15. In this case, the detection rods 14 and 15 are connected by connecting rods 16 and 17 to form a so-called link R.
Since the middle points of these connecting rods are rotatably supported by the supporting rod 19, the force exerted by the supporting rod 19 is applied to these detection rods 14 and 1.
5 to the sample 11 and the standard sample 12 in equal and parallel directions. Moreover, the support rod 19
are the movable rod 20d and the fixed rod 20c of the load applying means 20.
Since force is always applied in the vertical direction by a so-called link mechanism consisting of the main balance 20b and the main balance 20b, a pressing force (load) in the vertical direction is always applied to the sample 11 and the standard sample 12.

Therefore, when the sample 11 and the standard sample 12 are heated by the heating furnace 21, the detection rods 14 and 15 are respectively lowered downward in response to their thermal expansion. At this time, if there is no difference in thermal expansion between the sample 11 and the standard sample 12, both detection rods move the same distance, so the displacement detection means 18 does not detect any displacement.

On the other hand, if there is a difference in thermal expansion between the sample 11 and the standard sample 12, as shown in FIG. This is detected by the detection means 18. Thereby, the differential thermal expansion between the sample 11 and the standard sample 12 can be measured.

According to the above-mentioned embodiment, only one load application means is required, which simplifies the structure compared to the conventional case where two load application means are required. The operation is easy because the device can be set by applying the voltage.

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

This embodiment is, in short, a modification of the previous embodiment arranged horizontally, and the main structure is the same as that of the above embodiment, so the same parts are given the same reference numerals and detailed explanations will be given. Omitted.

In FIG. 3, in this embodiment, the sample 1 is placed in the support tube 13.
Mounting tables 13a and 13b are provided for mounting 1 and standard sample 12. Further, both ends of the horizontally arranged support rod 19 are rotatably attached to the lower ends of each of the two movable rods 31 and 32.
and 32 are rotatably housed in semi-fixed pieces 33, respectively. The semi-fixed piece 33 is attached so as to be semi-fixed and movable along a groove 34a provided in the fixed part 34. That is, this allows the support rod 19 to move freely in the horizontal direction. Further, the right end portion of the support rod 19 in the figure is bent upward to form a bent portion 19a.
is formed, and one end of a lever 35a of the load applying means 35 is in contact with this bent portion 19a. This lever 3
5a is rotatably supported at its center by a fixed fulcrum 35b, and by placing a weight 35C on the curved end, the support rod 19 is horizontally pressed to form a desired shape on the sample 11 and standard sample 12. It applies pressing force (load).

This embodiment also provides the same advantages as the previous embodiment.

In each of the above embodiments, the load applying means is constructed by mechanical means, but it goes without saying that it may be constructed by electrical means combining an electromagnetic coil and a magnet, for example. .

[Effects of the Invention] As described above in detail, the present invention connects the first and second detection rods, which move according to the thermal expansion of the sample and the standard sample, using a plurality of connecting rods to form a so-called link mechanism. configure,
A support rod is provided that passes through the center point of each of these connecting rods and is arranged parallel to each of the detection rods, and the support rod is rotatably supported at the center point of each of the connection rods, and a load is applied to the support rod. By doing so, it is possible to apply a pressing force equally to the sample and the standard sample through each of the detection rods using one load applying means, which simplifies the structure of the device. This has the effect of not only making it possible to do this, but also improving operability.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing one embodiment of the present invention, FIG. 2 is a diagram for explaining the operation of one 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. DESCRIPTION OF SYMBOLS 11... Sample, 12... Standard sample, 13... Support tube, 14... First detection rod, 15... Second detection rod, 16.17... Connecting rod, 18 ...Displacement detection means, 20.35...Load application means, E...Fixing part. Applicant MacScience Co., Ltd. Agent Patent Attorney Setsuo Ani-ya Figure 4

Claims (1)

[Scope of Claims] First and second detection rods are arranged such that one end of a sample and a standard sample arranged in parallel are in contact with a fixed part, respectively, and the other ends of the sample and the standard sample are respectively arranged in parallel. A differential thermal sensor that measures the difference in thermal expansion between the sample and the standard sample by touching one end of the detection rod and detecting the difference in the amount of movement of the sample and standard sample according to the thermal expansion of the sample and standard sample. In the expansion 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 in parallel. A support rod is rotatably supported on each of the detection rods, and a support rod is provided that passes through the midpoint of each of the connection rods and is arranged parallel to each of the detection rods, and the support rod is inserted into each of the connection rods. 1. A differential thermal expansion measuring device, which is rotatably supported at a point and is provided with a load applying means for applying force in the longitudinal direction of the support rod.