JPH068779B2 - Displacement measuring device for test piece of material testing machine - Google Patents

Description

The present invention relates to a material testing machine for testing a material of a test piece inside a hermetically sealed container, and more particularly to measuring a displacement amount between gauge marks of the test piece. The present invention relates to a test piece displacement amount measuring device.

(B) Conventional technology For example, in order to test a material of a test piece under high temperature and high pressure, it is necessary to store the test piece inside a high temperature and high pressure container. Then, it is necessary to apply a load to the test piece, measure the amount of displacement between the reference points of the test piece, and perform a material test on the test piece inside the high-temperature high-pressure container.

In a material testing machine, a detector such as a differential transformer is usually used when measuring the displacement between gauge marks of a test piece, but this type of detector is sensitive to temperature and pressure. Therefore, it cannot be inserted inside the high temperature and high pressure container. For this reason, conventionally, a pair of detection rods has been made to project from the inside of the high temperature and high pressure container to the outside, and each detection rod has been connected to the reference point of the test piece inside the high temperature and high pressure container. Then, the circumference of each detection rod is sealed by a seal ring. Further, a detector such as a differential transformer is provided outside the high temperature and high pressure container and is connected to each detection rod. Therefore, when a load is applied to the test piece and an amount of displacement between the gauge marks occurs, each detection rod moves in the axial direction following the load. As a result, the displacement between the gauge marks of the test piece is taken out of the high temperature and high pressure container. Therefore, the amount of displacement between the gauge marks of the test piece can be measured by the detector.

However, if the seal ring is sealed around the detection rod, friction between the seal ring and the detection rod is generated when the gauge displacement of the test piece is taken out, and this should not affect the measurement accuracy of the detector. Absent. Therefore, there is a problem that the measurement accuracy of the detector is low.
Furthermore, the internal pressure of the high-temperature high-pressure container acts on the detection rod, which also affects the measurement accuracy of the detector. In addition, in order to create a high temperature and high pressure environment, high temperature and high pressure gas or high temperature and high pressure liquid is usually enclosed in the high temperature and high pressure container, but there is also a problem of leakage and durability of the seal ring against this high temperature and high pressure gas or high temperature and high pressure liquid. . In the case of a toxic gas or a toxic liquid, if the leakage of the toxic gas or toxic liquid occurs, it becomes a particularly serious problem.

(C) Purpose Accordingly, the present invention provides a material testing machine for material testing a test piece inside a sealed container such as a high-temperature high-pressure container, in which the displacement measurement accuracy of the test piece is increased, and the conventional leakage and durability It was made for the purpose of solving the sexual problem.

(D) Structure According to the present invention, the test piece is housed inside the sealed container,
A load is applied to the test piece, the gauge displacement between the gauge marks of the test piece is measured, and in the material testing machine configured to test the material of the test piece inside the sealed container, the load direction of the test piece and A pair of fixed walls opposed to each other at intervals in a parallel direction is fixed to the sealed container, and a pair of gauge length displacement extracting members are arranged between the fixed walls, and a load direction of the test piece. The fixed walls and the take-out members are sealed by bellows that expand and contract in the parallel direction, the inside of the sealed container is communicated with the outside of the bellows, and the inside of the sealed container is projected to the outside of the bellows. Each of the extraction members is connected to a gauge point of the test piece by a connecting member, and a detector is arranged outside the sealed container.
A test piece displacement amount characterized in that the detector is connected to each of the extraction members by a connecting member arranged inside the bellows, and the gauge displacement between gauge points of the test piece is measured by the detector. A measuring device is provided.

(E) Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

In the figure, a test piece (1) is housed inside a high-temperature high-pressure container (2) and is fixed to a push-pull rod (3) and a receiving plate (4). The high temperature and pressure vessel (2) is inserted inside the heating furnace (5). Therefore, by enclosing high-temperature high-pressure gas or high-temperature high-pressure liquid inside the container (2) and heating the container (2) by the heating furnace (5), a high-temperature high-pressure environment can be generated inside the container (2). . Also, attach a pressure balancer to the lid plate (6) of the container (2).
(7) is fixed, push-pull rod (3) is pressure balancer
It is inserted inside (7) and is connected to a load mechanism (not shown) such as a hydraulic actuator. The backing plate (4) is a fixed frame
It is fixed to (8) and the lid plate (6). Therefore, when the load mechanism is driven, a tensile load can be applied to the test piece (1) by the push-pull rod (3). It is also possible to apply a tensile compression repeated load. The reaction force is the receiving plate (4),
It is transmitted to and supported by the fixed frame (8) and the cover plate (6). The pressure balancer (7) balances the internal pressure of the high temperature high pressure vessel (2) acting on the push-pull rod (3) and cancels it. Therefore, the internal pressure of the container (2) does not affect the load of the test piece (1).

This tester has a bellows case (1) containing a bellows (9).
0), and the case (10) is screwed and fixed to the lid plate (6) of the container (2). In addition, the case (10) has an upper end wall (11),
It has a lower end wall (12) and a peripheral side wall (13), and the upper end wall (11) and the lower end wall (12) face each other with a gap in a direction parallel to the load direction (X) of the test piece (1). It is located in. The bellows (9) has a cylindrical shape and is arranged so as to expand and contract in a direction parallel to the load direction (X) of the test piece (1), and its radius is constant over the entire length of the bellows (9). In addition, a pair of flanges (14A) and (14B) are used as the gauge length displacement amount extracting members for extracting the gauge point displacement amount of the test piece (1).
4A) and (14B) are arranged between the end walls (11) and (12) of the case (10). Also, in this embodiment, the top wall of the case (10)
In addition to (11) and the lower end wall (12), an intermediate wall (15) is provided,
The intermediate wall (15) is arranged between the flanges (14A) and (14B). Then, each end wall (11), (1
2), the flanges (14A), (14B) and the intermediate wall (15) are sealed, and the inside of the container (2) communicates with the communication hole (16) of the case (10) and the outside of the rose (9). Is configured.

Also, this tester has a connecting pipe (17A) and a connecting rod (17B).
And the connecting pipe (17A) is inside the container (2) and the case (10).
It is inserted in the connecting hole (16). The connecting rod (17B) is inserted inside the container (2) and inside the connecting pipe (17A). The pair of arms (18A) and (18B) are fixed to the reference point of the test piece (1), and the connecting pipe (17A) and the connecting rod (17B) are fixed to the arms (18A) and (18B). . Furthermore, the connecting bars (19A) and (19B) penetrate the lower end wall (12) of the case (10) and project to the outside of the bellows (9), and the flanges (14A) are connected by the connecting bars (19A) and (19B). , (14B) are connected to the connecting pipe (17A) and the connecting rod (17B). Therefore, the connecting members, that is, the arms (18A), (18B), the connecting pipe (17A), the connecting rod (17B) and the connecting bar (19A), projecting from the inside of the high temperature and high pressure container (2) to the outside of the bellows (9). , (19B) connect each flange (14A), (14B) to the gauge point of the test piece (1).

Further, this tester has a differential transformer (20), which is composed of a coil (21A) and an iron core (21B), and is provided above the bellows case (10). And bellows
Connecting rods (22A) and (22B) are arranged inside (9), the coil (21A) is connected to the flange (14A) by the connecting rod (22A), and the iron core (21B) is flanged by the connecting rod (22B).
It is linked to (14B).

The bellows case (10) has a cooling chamber (23A) for circulating the cooling liquid.
With a bellows (9), connecting pipe (17A) and connecting rod (1
7B) can be cooled.

In the testing machine configured as described above, when a load is applied to the test piece (1) and a displacement amount between the gauge points occurs, the arm
(18A) and (18B) follow each other and are displaced in the direction parallel to the load direction (X) of the test piece (1). The connection pipe (17A) and the connection rod (17B) move integrally with the arms (18A) and (18B) and are displaced in the axial direction. Therefore, the flanges (14A) and (14B) of the bellows case (10) and the connecting bar (19
A) and (19B) move integrally with the connecting pipe (17A) and the connecting rod (17B). Bellows (9) is the load direction (X) of the test piece (1)
It expands and contracts in the direction parallel to and absorbs the movement of the flanges (14A) and (14B). As a result, the displacement between the gauge marks of the test piece (1) is taken out of the high temperature and high pressure container (2). Furthermore, the coil (21A) of the differential transformer (20) moves integrally with the flange (14A) and the connecting rod (22A), and the iron core (21B) moves to the flange (14A).
B) and connecting rod (22B) move integrally. Therefore, the coil (21A) and the iron core (21B) are relatively displaced, and the differential transformer (20) detects and measures the gauge length displacement amount of the test piece (1). Therefore, the test piece (1) can be material tested under the high temperature and high pressure environment of the container (2).

Further, this tester can accurately take out the displacement amount between the gauge marks of the test piece (1). When the connecting rods (17A), (17B) and the flanges (14A), (14B) move, the bellows (9) only expands and contracts in the direction parallel to the load direction (X) of the test piece (1), Unlike the conventional case, the problem of friction does not occur. Therefore, the measurement accuracy of the differential transformer (20) is high. Further, the internal pressure is guided to the outside of the bellows (9) by the high temperature and high pressure container (2),
Connecting pipe (17A), connecting rod (17B) and each flange (14
A) and (14B) receive the internal pressure of the high temperature and high pressure container (2), but the internal pressure causes the connecting pipe (17A), connecting rod (17B) and each flange.
The upward and downward forces applied to (14A) and (14B) are substantially the same and cancel each other out. Therefore, the container
The internal pressure of (2) does not affect the measurement accuracy of the differential transformer (20),
It is possible to accurately measure the gauge displacement between the test pieces (1).

Further, the bellows (9) of the bellows case (10) hermetically seals between the end walls (11) and (12) and the flanges (14A) and (14B), and there is no problem of leakage and durability. Therefore, there is no problem even if the high temperature high pressure gas or the high temperature high pressure liquid is enclosed in the container (2). It is also possible to enclose toxic gas or toxic liquid.

It should be noted that various modifications of the present invention are possible in addition to the above-described embodiment. For example, the flanges (14A) and (14B) do not necessarily have to be arranged between the upper end wall (11) and the lower end wall (12) of the bellows case (10), and a structure different from that of the bellows case (10) may be used. A suitable pair of fixed walls may be opposed to each other at intervals in a direction parallel to the load direction (X) direction of the test piece (1).

Then, the flanges (14A) and (14B) are arranged between the fixed walls and the bellows (9) are used to fix the fixed walls and the flanges (14B).
Even if the space between (A) and (14B) is sealed, the amount of displacement between the gauge marks of the test piece (1) can be taken out by the flanges (14A) and (14B). Therefore, improve the measurement accuracy of the differential transformer (20),
Problems such as leakage and durability can be solved, and similar effects can be obtained. Detectors other than the differential transformer (20) can also be used. Connecting pipe (17A), connecting rod (17B), connecting bar (19A), (19B) and connecting rod (22
Instead of A) and (22B), connecting members of other shapes may be used. In short, each flange (14A), (14B) is connected to the gauge point of the test piece (1) by the connecting member protruding from the inside of the high temperature high pressure vessel (2) to the outside of the bellows (9), and the bellows is connected.
The detector may be connected to the flanges (14A) and (14B) by a connecting member arranged inside (9). Depending on the case, instead of the flanges (14A) and (14B), a gauge length displacement amount attachment member having other shape may be provided. The present invention can also be applied to a tester that uses a sealed container other than the high temperature and high pressure container (2), for example, a tester that arranges test pieces inside a vacuum container.

(F) Effect As described above, according to the present invention, the pair of fixed walls (11) and (12) facing each other with a space in the direction parallel to the load direction (X) of the test piece (1) are provided. Is fixed to the sealed container (2),
A pair of gauge length displacement extraction members (14A) and (14B) are attached to each fixed wall (1
Each fixed wall (11), by means of a bellows (9) which is arranged between 1) and (12) and expands and contracts in the direction parallel to the load direction (X) of the test piece (1).
The space between (12) and each mounting member (14A), (14B) is sealed. Furthermore, the inside of the sealed container (2) communicates with the outside of the bellows (9),
Each extraction member (14A), (14B) is connected to the reference point of the test piece (1) by the connecting members (17A), (17B) protruding from the inside of the sealed container (2) to the outside of the bellows (9), Detector (20) is a sealed container (2)
Of the detector (20) by the connecting members (22A) and (22B) arranged outside the rose and inside the rose (9).
It is connected to A) and (14B). Therefore, when the gauge-to-mark displacement of the test piece (1) occurs, each connecting member (17
A), (17B), (22A), (22B) and each extraction member (14A), (14
B) moves in the direction parallel to the load direction (X) of the test piece (1), the bellows (9) expands and contracts in the direction parallel to the load direction (X) of the test piece (1), and the detector (20 ) Detects the movement of the connecting members (22A) and (22B). Thereby, the amount of displacement between the reference points of the test piece (1) can be measured.

Therefore, according to the present invention, even with the test piece (1) inside the sealed container (2), it is possible to measure the gauge displacement between the gauge marks of the test piece (1) by the external detector (20). it can. Moreover, the connecting members (17A), (17B), (22A), (22B) and the ejecting members (14A), (14B) move in the direction parallel to the load direction (X) of the test piece (1). , Between each fixed (11), (12), bellows
(9) only expands and contracts in the direction parallel to the load direction (X) of the test piece (1), and the problem of friction does not occur. Also a sealed container
The internal pressure of (2) is guided to the outside of the bellows (9), and the connecting members (1
7A), (17B) and each extraction member (14A), (14B) are hermetically sealed containers
Although receiving the internal pressure of (2), in the direction parallel to the load direction (X) of the test piece (1), each connecting member (17A), (17B) is applied by the internal pressure.
And the unidirectional and reverse forces exerted on each ejection member (14A), (14B) are substantially the same and cancel each other out.
Therefore, the internal pressure of the sealed container (2) does not affect the measurement accuracy of the detector (20), and the amount of displacement between the gauge marks of the test piece (1) can be accurately measured. Each fixed wall (1 by the bellows (9)
1), (12) and each extraction member (14A), (14B) are sealed, there is no problem of leakage and durability, and even if high temperature high pressure gas or high temperature high pressure is sealed inside the sealed container (2). There is no problem. It is also possible to enclose toxic gas or toxic liquid.

[Brief description of drawings]

 The drawings are sectional views showing an embodiment of the present invention. (1) …… Test piece (2) …… High temperature and high pressure container (9) …… Bellows (11) …… Upper end wall of bellows case (12) …… Lower end wall of bellows case (14A), (14B) …… Flange (16) ... Bellows case communication hole (17A) ... Connection pipe (17B), (22A), (22B) ... Connection rod (20) ... Differential transformer

Claims (1)

[Claims] 1. A test piece is housed in a sealed container, a load is applied to the test piece, the displacement between gauge marks of the test piece is measured, and the test piece is subjected to a material test inside the sealed container. In the material testing machine configured to do so, a pair of fixed walls opposed to each other at intervals in the direction parallel to the load direction of the test piece is fixed to the sealed container, and a pair of gauge point displacement amount extraction members is provided. A bellows which is arranged between the fixed walls and expands and contracts in a direction parallel to the load direction of the test piece seals between the fixed walls and the extraction members, and the inside of the sealed container is communicated with the outside of the bellows. Along with, the respective extraction members are connected to the reference point of the test piece by a connecting member that is projected from the inside of the sealed container to the outside of the bellows, and a detector is arranged outside the sealed container, and the bellows of Inside Said detector is connected to the respective output members, said detector by said specimen test piece displacement measuring device, characterized in that the gauge between the displacement amount so as to measure the by the connecting member.