JPH07190970A - Differential thermal expansion measuring instrument - Google Patents

Abstract

PURPOSE:To provide a differential thermal expansion measuring instrument which does not take any nonpredetermined action and, therefore, can measure differential thermal expansion with extremely high accuracy. CONSTITUTION:A plurality of linkage levers 16 and 17 are arranged in parallel so that first and second detecting rods 14 and 15 can move in parallel with each other in accordance with the displacement of a sample 11 and standard sample 12 and both end sections of the levers 16 and 17 are rotatably supported by the rods 14 and 15. Then a mobile lever 19 which passes through and is rotatclbly supported by the midpoints of the levers 16 and 17 is provided in parallel with the rods 14 and 15. In addition, one end sections of supporting levers 31a and 31b and 32a and 32b are respectively connected in horizontally rotatable states to the upper and lower ends of supporting shafts 31d and 32d vertically fixed to a plurality of locations of the mobile lever 19 in its length direction and the other end sections of the levers 31a and 31b and 32a and 32b are respectively connected in horizontally rotatable states to the upper and lower ends of supporting shafts 31c and 32c vertically fixed to a second fixing section 40. Moreover, a load applying means 42 is provided to apply pressing forces to the samples 11 and 12 in the length direction of the mobile lever 19.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved differential thermal expansion measuring device for measuring the differential thermal expansion between a sample and a standard sample.

[0002]

2. Description of the Related Art FIG. 3 is a diagram showing a conventional differential thermal expansion measuring device, and FIG. 4 is an operation explanatory diagram of the conventional differential thermal expansion measuring device. In FIG. 3, one end of each of the rod-shaped sample 11 and the standard sample 12 is in contact with the support tube 13 fixed to the fixed portion E, and the other end is the first and second detection rods 14.
And 15 are respectively abutted on one end and are supported substantially in parallel. These detection rods 14 and 15 are arranged substantially horizontally, and are connected by two connecting rods 16 and 17. That is, these connecting rods 16 and 17
Are arranged in parallel with a certain distance, and both ends of each are rotatably supported by the first and second detection rods 14 and 15. The coil portion 18a of the differential transformer 18 serving as a displacement detecting means is attached to one end of the first detection rod 14, and the iron core of the differential transformer is attached to one end of the second detection rod 15. 18b is attached.

Further, a movable rod 19 disposed in parallel with each of the detection rods 14 and 15 is rotatably supported at the midpoint of each of the connecting rods 16 and 17. In addition, the movable rod 19
Both end portions of the support rods 31 and 32 are rotatably attached to the lower end portions of the two support rods 31 and 32, respectively.
The upper ends of 2 are rotatably attached to sliders 33, respectively. The slider 33 is fixed to the fixing portion 34.
It is attached so as to be movable in a semi-fixed manner along a groove 34a provided in the. That is, by this, the movable rod 19 can be fixed together with the slider 33 at a desired horizontal position. Further, the right end of the movable rod 19 in the figure is bent upward to form a bent portion 19a, and one end of a lever 35a of the load applying means 35 is in contact with the bent portion 19a. The lever 35a has a center portion rotatably supported by a fixed fulcrum 35b, and a weight 35c is placed on the other end portion of the lever 35a to press the movable rod 19 in the horizontal direction, thereby causing the sample 11 and the standard sample 12 to rotate. A desired pressing force (load) is applied to.

According to the above construction, by placing the weight 35c of an appropriate weight on the right end portion of the lever 35a in the figure,
Through the support rod 19 and the connecting rods 16 and 17, the detection rod 14,
One end of the sample 15 can be pressed to one end of the sample 11 and the standard sample 12 with an appropriate force.
And the standard sample 12 can be held between the support tube 13 and the detection rods 14 and 15. In addition, in this case, the detection rods 14 and 15 are connected by the connecting rods 16 and 17 to form a link mechanism, and the respective middle points of these connecting rods are rotatably supported by the movable rod 19. , The force applied by the movable rod 19 is the detection rod 1
Sample 1 always in an even and parallel direction via 4 and 15
1 and standard sample 12. Moreover, the movable rod 19
Is always applied only in the horizontal direction by the load applying means 35, so that only the horizontal pressing force 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 pushed rightward in accordance with the thermal expansion of the samples. 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.
Accordingly, a difference in the amount of movement is produced between the detection rods 14 and 15 by ΔL, and 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.

[0006]

However, in the above-mentioned conventional apparatus, the support rods 31 and 32 are inclined by θ in the right direction in the drawing due to the thermal expansion of the sample 11 and the standard sample 12, so that the support rods are inclined. Due to the weights of 31, 32 and the weights of the movable rod 19, the connecting rods 16, 17 and the supporting rods 14, 15 supported by these supporting rods, the force indicated by f in the figure
1 and the standard sample 12 will be additionally operated. Moreover, the force f varies depending on the degree of thermal expansion of the sample 11 or the like. For this reason, there is a possibility that an error may occur in the value of the differential differential thermal expansion in which the sample 11 and the standard sample 12 are compressed by the action of the force f.

The present invention has been made in view of the above circumstances, and an unintended force does not act on a sample and a standard sample, so that the differential thermal expansion can be measured with extremely high accuracy. An object is to provide an expansion measuring device.

[0008]

According to the differential thermal expansion measuring apparatus of the present invention, one end of each of a sample and a standard sample, which are arranged substantially horizontally and parallel to each other, is brought into contact with a first fixing portion, and the sample and the standard sample are standardized. The one end portions of the first and second detection rods arranged in parallel to the other end portion of the sample are brought into contact with each other, and the detection rods move in accordance with the linear displacement amount of the sample and the standard sample. Is a differential thermal expansion measuring device for measuring the thermal expansion difference between the sample and the standard sample by detecting Specifically, a plurality of connecting rods are arranged in parallel so that the first and second detection rods can move in parallel to each other in accordance with the displacement amounts of the sample and the standard sample, and both ends of each of the connecting rods are arranged. Is rotatably supported on each detection rod, and further, a movable rod is arranged parallel to each detection rod passing through the midpoint of each of the connecting rods, and the movable rod is rotated to the midpoint of each connecting rod. The movable rod is freely supported, and one end of a substantially parallel and parallel support rod is rotatably connected to a plurality of positions in the longitudinal direction of the movable rod, and the other end of the support rod is rotatable to a second fixed portion. And a load applying means for applying a force to press the sample and the standard sample in the longitudinal direction of the movable rod.

[0009]

When the sample and the standard sample are linearly distorted (expanded or contracted), the detection rod and the movable rod are displaced accordingly, and the supporting rod is tilted by a predetermined angle in the horizontal plane. In this case, since the inclination of the supporting rod is the inclination in the horizontal plane, even if this inclination occurs, the weight of the supporting rod itself and the weight of the member supported by this do not add to the sample and the standard sample. , There is no possibility of causing an error due to this.

[0010]

1 is a diagram showing a schematic configuration of a differential thermal expansion measuring apparatus according to an embodiment of the present invention, and FIG. 2 is a plan view of the differential thermal expansion measuring apparatus according to an embodiment of the present invention. An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. It should be noted that, in principle, in this embodiment, the supporting rods 3 arranged substantially vertically in the above-mentioned conventional example.
Instead of 1, 32, a horizontally arranged supporting rod is used, and other points are almost the same as the above-mentioned conventional example, and therefore, the same reference numerals are given to the same components as those of the above-mentioned conventional example. The description thereof will be omitted, and the points peculiar to this embodiment and the operation and effect thereof will be mainly described below.

In the figure, reference numeral F is a horizontal fixed surface such as the surface of the mounting table. A stand (second fixing portion) 40 is attached to the horizontal fixing surface F, and support shafts 31c and 32c fixed so that the longitudinal direction is vertical are fixed to both ends in the longitudinal direction of the stand 40. . Also, this support shaft 3
Support rods 31a, 31b and 32a, 32a, 1c, 32c are provided at the upper and lower ends thereof so that their longitudinal directions are horizontal.
Each one end of 32b is rotatably supported in the horizontal direction. In this case, the support rods 31a and 31b have an upper / lower arrangement relationship in the vertical plane. Similarly, the support rods 32a and 32b have an upper / lower arrangement relationship in a vertical plane. In addition, the support rods 31a, 31b and 3
The other end of each of 2a and 32b is rotatably supported in the horizontal direction on the upper and lower ends of support shafts 31d and 32d fixed to the movable rod 19 such that the longitudinal direction thereof is vertical. Therefore, the set of the support rods 31a and 31b and the set of the support rods 32a and 32b are functionally integrated as one support rod which is rotatable in the horizontal direction about the support shafts 31c and 32c. In addition, the mechanism constituted by a set of these support rods is a kind of link mechanism that supports the movable rod 19 movably in the horizontal direction. That is, these support rods 31
a, 31b and 32a, 32b support the movable rod 19 so as to be movable in the horizontal direction, but when the movable rod 19 is displaced, the displacement direction along with this is the horizontal direction. It is different from the conventional one.

A portion of the movable rod 19 on the left side in the drawing is pivotally supported by the connecting rods 16 and 17 as in the conventional example, but a magnet 43 is attached to the right end portion in the drawing.
Around the magnet 43, a coil 44 fixed to the external fixing portion is arranged. As a result, the weight applied to the sample 11 and the standard sample 12 can be adjusted by adjusting the current applied to the coil 44, and the magnet 43 and the coil 44 constitute the weight applying means 42.

Next, the operation of the differential thermal expansion measuring device having the above structure will be described. First, by supplying an electric current to the coil 44, the coil 44 is excited and a force acting to the left side in the drawing acts on the magnet 43. By this force, the movable rod 19
And one end of the detection rods 14 and 15 are pressed against the one ends of the sample 11 and the standard sample 12 through the connecting rods 16 and 17 with appropriate forces, and the sample 11 and the standard sample 12 are supported by the support tube 1.
It is held between 3 and the detection rods 14 and 15. Next, when the sample 11 and the standard sample 12 are heated by the heating furnace 21, the detection rods 14 and 15 move to the right side in accordance with the thermal expansion of these, and the movable rod 19 also moves to the right side accordingly. In this case, since the movable rod 19 is supported by the support rods 31 and 32 which are parallel to each other, the movable rod 19 moves in parallel, but since the support rods 31 and 32 are arranged substantially horizontally, the support rods are substantially horizontal. The weight of 31, 32 is not applied to the movable rod. Therefore, since only the force P by the weight applying means 42 is applied to the movable rod 19, the sample 11 and the standard sample 12 are not compressed by an unexpected force, and the differential thermal expansion is measured with extremely high accuracy. can do.

Although the weight applying means is composed of the magnet 43 and the coil 44 in the above embodiment, it may be of a balance type structure as shown in FIG.

[0015]

As described above in detail, according to the present invention, 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 displacement amounts of the sample and the standard sample. And movably support the both ends of each of the connecting rods to the detection rods, and further provide movable rods that pass through the midpoints of the connecting rods and are parallel to the detection rods. The movable rods are rotatably supported at the midpoints of the respective connecting rods, and one end portions of the supporting rods that are substantially horizontal and parallel to each other are rotatably connected to a plurality of positions in the longitudinal direction of the movable rods. The other end is rotatably connected to the second fixed part, and a load applying means for applying a force to press the sample and the standard sample in the longitudinal direction of the movable rod is provided. There are no unintended forces acting and therefore the differential thermal expansion It can be measured with high accuracy Te.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration of a differential thermal expansion measuring device according to an embodiment of the present invention.

FIG. 2 is a plan view of a differential thermal expansion measuring device according to an embodiment of the present invention.

FIG. 3 is a side view showing a conventional differential thermal expansion measuring device.

FIG. 4 is a diagram for explaining the operation of the differential displacement measuring device.

[Explanation of symbols]

 11 sample 12 standard sample 13 support tube 14 first detection rod 15 second detection rod 16, 17 connecting rod 18 displacement detecting means 19 movable rods 31a, 31b, 32a, 32b support rod 31c, 31d, 32c, 32d support shaft 40 stand (second fixing part) 42 load applying means.

Claims (1)

[Claims] 1. A first and a first samples, which are arranged substantially horizontally and parallel to each other, have one ends of the sample and the standard sample respectively abutting against the first fixing part and the other ends of the sample and the standard sample, respectively. And one end portion of the second detection rod are brought into contact with each other, and the difference in the movement amount of these detection rods that move in accordance with the displacement amount of the sample and the standard sample in the linear direction is detected, whereby thermal expansion of the sample and the standard sample A differential thermal expansion measuring device for measuring a difference, wherein 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 thermal expansion of the sample and the standard sample. Then, both ends of each of the connecting rods are rotatably supported by the detection rods, and further, movable rods that are arranged parallel to the detection rods through the respective midpoints of the connecting rods are provided. The movable rod is rotatably supported at the midpoint of each of the connecting rods. , One end of a substantially parallel and parallel supporting rod is rotatably connected to a plurality of longitudinal positions of the movable rod, and the other end of the supporting rod is rotatably connected to a second fixed portion. A differential thermal expansion measuring device, further comprising load applying means for applying a force for pressing the sample and the standard sample in the longitudinal direction of the movable rod.