JPH10197429A - Compression tester - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate test preparation and cleaning, by impressing a pressure to the interior of a container via a communication hole from the outside, acting a uniform hydrostatic pressure in a direction inward of a diameter of a measurement sample via a plurality of elastic bodies, and inserting the sample into one elastic body. SOLUTION: A step 13a of a sleeve nut 13 prevents a urethane sleeve 22 from being displaced from a predetermined position when a compression tester 10 is pressured. A pressure transmission rubber is set inside a pressure container 11. A circular ring part 21a expanding in an outer circumferential direction at both end parts of the transmission rubber is held between a flange 12 and a circular ring part 11a of the container 11 and fixed by a bolt 17. The bolt 17 is inserted at a position not to penetrate the circular ring part 21a, thereby letting the circular ring part 21a move freely. A thickness of a boundary part between a cylindrical part 21b and the circular ring part 21a of the pressure transmission rubber is made nearly equal, and therefore durability to a repeated increase/decrease of the pressure is improved. A preparation for testing and cleaning of a jig after the testing can be carried out easily, a time required for the testing is shortened, and test efficiency is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compression tester for measuring the compression strength of a columnar measurement sample.

2. Description of the Related Art Conventionally, a hydrostatic pressure type shown in FIG. 7 has been known as a compression measuring device for measuring the compressive strength of a columnar measurement sample. In this method, a measurement sample 61 having a diameter of 100 mm to 150 mm is wrapped inside a urethane rubber cylinder 75 of 1 to 2 mm thickness formed of urethane rubber having an inner diameter corresponding to the diameter, and both ends of the measurement sample 61 in the longitudinal direction are wrapped. The disc-shaped aluminum plates 71 and 72 are brought into contact with each other. Then, the outer periphery of the urethane rubber 75 is wrapped around with a rubber band 76, a cylindrical pressure vessel 52 is filled with water 51, and the measurement sample 61 treated as described above is submerged therein and pressurized.

[0003]

However, in the conventional compression tester, it takes a long time to wrap the measurement sample 61 with the rubber band 76, and when a large number of measurements are required, a lot of time is required for this operation. There was a problem that the measurement work did not proceed smoothly. Further, since the compression test is performed by submerging the measurement sample 61 in water, if the measurement sample 61 is broken, fragments of the measurement sample 61 may adhere to the urethane rubber cylinder 75. There was a problem that cleaning became complicated.

[0004] The present invention has been made to solve the above problems, and an object of the present invention is to facilitate preparation of a compression test and facilitate cleaning after the compression test.

[0005]

For this purpose, the compression tester of the present invention has an annular portion extending in the outer peripheral direction at both ends, and has an outer wall and an inner wall through which a hydrostatic pressure medium flows. A cylindrical container having a communication hole communicating therewith, and a first elastic member having a ring-shaped portion installed inside the cylindrical container and sealing the pressure medium and having annular portions extending at both ends in an outer peripheral direction. A body, a measurement sample can be installed inside the first elastic body, and a cylindrical second elastic body approximate to the cross-sectional shape of the measurement sample; A support cylinder that supports a lower end and reciprocates in the axial direction of the second elastic body, and supports an upper end of the measurement sample and reciprocates in the axial direction of the second elastic body Pressing the holding cylinder and the annular portion of the first elastic body into the annular portion of the cylindrical container. A ring-shaped crimping member, characterized by comprising a O-ring be disposed between the first elastic body annular portion and said ring-shaped crimping member. Here, it is preferable that the ring-shaped pressure-bonding member and the cylindrical container are pressure-bonded at the outer peripheral portion of the portion where the O-ring is provided, in that the durability of the first elastic body is improved.

Further, it is preferable to have a groove passing through the communication hole on the inner peripheral surface of the cylindrical container because the followability of pressurization and decompression is improved. This is because the pressure medium on the inner peripheral surface of the container can move through the groove. Further, by forming a groove that intersects with this groove, the followability is further improved. Further, the thickness of the boundary between the cylindrical portion and the annular portion of the first elastic body is substantially the same as the thickness of the cylindrical portion and the annular portion of the first elastic body. It is preferable in terms of improving durability. In addition, it is preferable that the boundary between the cylindrical portion and the annular portion of the first elastic body be connected smoothly from the viewpoint of improving the durability of the first elastic body. According to the compression tester of the present invention, when pressure is applied from the outside to the inside of the container via the communication hole, the measurement sample is radially inwardly applied to the measurement sample via the first elastic body and the second elastic body. Even hydrostatic pressure acts. By inserting the measurement sample into the cylindrical second elastic body, preparation for the compression test is possible, which is easy, and the operation of forming a film such as rubber on the measurement sample during the test can be omitted. Even if the measurement sample is destroyed, the debris is removed from the lower side, so that cleaning is simplified.

[0007]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described with reference to FIGS. The compression tester 10 includes an iron cylindrical pressure vessel 11, an annular iron flange 12 having a fixed width at both ends in the longitudinal direction of the compression tester 10, and urethane rubber installed inside the pressure vessel 11. A cylindrical pressure transmitting rubber 21, a urethane sleeve 22 made of urethane rubber set inside the pressure transmitting rubber 21, an air vent plug 46, and the above jig.

The compression tester 10 is fixed to a base 45 of a compression test apparatus to which the embodiment of the present invention shown in FIG. Pressurized container 11
An annular portion 11 a extending in the outer peripheral direction is formed at both ends, and the annular portion 11 a is fixed to the flange 12 by bolts 17. The pressurizing container 11 is formed with three pressurizing holes 11b to which a pressurizing tube of a pressurizing device (not shown) is connected.

The step 13a on the stairs of the sleeve stopper 13
Prevents the urethane sleeve 22 from coming off a predetermined position when the compression tester 10 is pressurized by a pressurizing device (not shown). The pressure transmitting rubber 21 is
A ring portion 21 a is formed at both ends of the pressure transmitting rubber 21 and extends in the outer peripheral direction. This annular part 21
a is sandwiched between the flange 12 and the annular portion 11 a of the pressurized container 11, and is fixed by bolts 17. At this time, the O-ring 23 is disposed between the flange 12 and the annular portion 21a. The bolt 17 is inserted outside the annular portion 21a so as not to penetrate the annular portion 21a. When the bolt 17 is fixed by penetrating the annular portion 21a, the force acting on the pressure transmitting rubber 21 when pressurizing / depressurizing is applied to the contact point between the bolt 17 and the through hole of the annular portion 21a. It may be broken from the through hole of the annular portion 21a. The position where the bolt 17 is inserted is defined by the annular portion 21a.
Is prevented from penetrating through the annular portion 21a.
Can be given freedom of movement. The annular portion 21
Even if a moves, a seal against pressure is ensured by the function of the O-ring 23. Further, by disposing the O-ring 23 between the flange 12 and the annular portion 21a, the amount of movement of the annular portion 21a during pressurization is reduced, and the sealing performance is improved.

The cylindrical portion 21b of the pressure transmitting rubber 21 and the annular portion 2
1a, the thickness of the cylindrical portion 21b and the annular portion 21
It is assumed to be substantially the same as the thickness of a. Further, the boundary between the cylindrical portion 21b and the annular portion 21a is made a smooth surface. Thereby, the durability of the pressure transmitting rubber 21 with respect to the repetition of pressurization / decompression is improved.

The urethane sleeve 22 has two steps at both ends.
2a is formed, and the step 22a is formed on the sleeve stopper 13
When the compression tester 10 is pressurized, the urethane sleeve 22 is prevented from coming off from a predetermined position. The urethane sleeve 22
A cavity in which the honeycomb structure 31 can move is formed inside the longitudinal direction. Cross-sectional shape of this cavity and honeycomb structure 3
1 have substantially the same cross-sectional shape.

The compression test procedure for the honeycomb structure 31 will be described below with reference to FIG. The support cylinder 41 is moved to the upper part of the compression tester 10, and the honeycomb structure 31 is placed on the support cylinder 41 such that the directions of the plurality of through holes of the honeycomb structure are vertical. The support cylinder 41 is lowered to the lower part of the compression tester 10, and the honeycomb structure 3 sandwiched between the support cylinder 41 and the holding cylinder 42
A force of about 10 kgf / cm ² is applied to the support cylinder 41 and the presser cylinder 42 so that 1 does not move due to pressurization.

A groove 27 is formed in the longitudinal direction of the outer peripheral surface of the support cylinder 41. When the honeycomb structure 31 is broken during the compression test, the broken debris falls on the tray 28, thereby reducing the time and effort for cleaning.

A water injection valve (not shown) is opened, and water is injected between the pressurized container 11 and the pressure transmitting rubber 21. At this time, the air vent plug 46 is opened, the air between the pressurized container 11 and the pressure transmitting rubber 21 is vented according to the water injection, and the air vent plug 46 is closed. The pressure transmitting rubber 21 is pressurized through a pressurizing tube by a pressurizing device (not shown), and the urethane sleeve 22 is pressed.
Pressure is transmitted to the honeycomb structure 31 through the. Pressurization is completed in about 10 seconds. When the pressure is applied, the urethane sleeve 22 comes into close contact with the outer peripheral surface of the honeycomb structure 31, and the pressure is uniformly applied to the entire outer peripheral surface of the honeycomb structure 31. FIG. 6 shows the state of the compression tester 10 during pressurization. The pressurized container 1
In order to improve the responsiveness of the water injection and dehydration at the time of pressurization / decompression, the inner peripheral surface of
And three grooves 26 in the horizontal direction. One of the grooves 26 was located at a position passing through the communication hole.

[0015]

According to the compression tester of the present invention, the preparation of the compression test and the cleaning of the test jig after the test are facilitated, so that the time required for the test can be shortened. There is an effect that durability is improved and efficiency of a compression test is improved.

[Brief description of the drawings]

FIG. 1 is a perspective sectional view of a compression tester according to an example of an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of a compression tester according to an example of an embodiment of the present invention.

FIG. 3 is an exploded view of a compression tester according to an example of the embodiment of the present invention.

FIG. 4 is a longitudinal sectional view of a compression tester according to an example of the embodiment of the present invention.

5 is a view in the direction of arrow A in FIG. 4;

FIG. 6 is a schematic side view of a compression test apparatus to which a compression test machine according to an example of the embodiment of the present invention is applied.

FIG. 7 is a schematic perspective view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Compression testing machine 11 Pressurized container (container) 11a Ring part 11b Press part 12 Flange 13 Sleeve stopper 13a Step 15 Screw 16 Bolt 17 Bolt 21 Pressure transmitting urethane rubber (First elastic body) 21a Ring part 21b Cylinder part 22 Urethane sleeve (second elastic body) 23 O-ring 24 Push plate 25 Push plate 26 Groove 27 Groove 28 Receiving tray 31 Honeycomb structure 41 Support cylinder 42 Holding cylinder 45 Base 46 Air vent plug 51 Water 52 Pressurized container ( Container) 61 Measurement sample 71 Aluminum plate 72 Aluminum plate 75 Urethane rubber cylinder 76 Rubber band

Claims (5)

[Claims] 1. A cylindrical container having an annular portion extending at both ends in an outer peripheral direction and having a communication hole communicating an outer wall and an inner wall through which a hydrostatic pressure medium flows. A first elastic body, which is installed inside the container and has a cylindrical shape that seals the pressure medium and has annular portions that extend in the outer peripheral direction at both ends, and is installed inside the first elastic body. And a second elastic body having a cylindrical shape approximate to the cross-sectional shape of the measurement sample, and a lower end of the measurement sample supported, and a shaft of the second elastic body. A support cylinder capable of reciprocating in a direction, a support cylinder supporting an upper end of the measurement sample, and capable of reciprocating in an axial direction of the second elastic body, and an annular portion of the first elastic body. A ring-shaped pressure-bonding member that is pressed against a ring portion of the cylindrical container; and a ring of the first elastic body. Compression tester, wherein the O-ring be disposed, further comprising a between the ring-shaped crimping member and. 2. The compression tester according to claim 1, wherein the ring-shaped crimping member and the cylindrical container are crimped at an outer peripheral portion where the O-ring is provided. 3. The compression tester according to claim 1, wherein the inner peripheral surface of the cylindrical container has a groove passing through a communication hole. 4. The thickness of the boundary between the cylindrical portion and the annular portion of the first elastic body is substantially the same as the thickness of the cylindrical portion and the annular portion of the first elastic body. Item 4. The compression tester according to any one of Items 3 to 7. 5. The compression tester according to claim 1, wherein a boundary between the cylindrical portion and the annular portion of the first elastic body is smoothly connected.