JP2808936B2 - Particle impact test equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a particle collision test apparatus for evaluating impact resistance of ceramic products and the like.

[0002]

2. Description of the Related Art In order to evaluate the impact resistance of a ceramic turbine rotor and the like, it is necessary to measure the impact strength and bending strength of a product after colliding minute particles with a test device as shown in FIG. Is being done.

In the drawing, reference numeral 1 denotes a sabot for holding particles made of a hard material in a holding hole provided at the distal end. The sabot 1 is inserted into a discharge port at the base end of a guide tube 2, A gas chamber 4 separated by a diaphragm 3 is formed, and a high pressure gas (helium gas) of a cylinder 5 is filled in the gas chamber 4 by a valve 6.
Is filled through.

After the setting, when a firing button (not shown) is pressed, the hammer 7 collides with the needle 8, and the tip of the needle 8 which has protruded forward breaks the diaphragm 3, and the high pressure of the gas chamber 4 is accordingly increased. The gas intensely flows into the guide tube 2 while expanding, and the Sabot 1 is accelerated to a high speed.

[0005] The accelerated Sabot 1 collides with a stopper 9 provided at the tip of the guide cylinder 2 and stops.
The particles held by the sabot 1 fly forward from the holding holes by inertia and collide with the sample 10.

A speed detector (coil) 11 is arranged in the middle of the guide tube 2, and an oscilloscope 12 reads an electromotive force waveform when the magnet 13 attached to the sabot 1 passes through the detector 11. Thus, the passing speed of the Sabot 1 is measured. 14 and 15 are O-rings (CERAM
ICS JAPAN 25 (1990) No. 2) See the Japan Ceramics Association.

[0007]

However, in such an apparatus, the higher the required particle velocity, the higher the gas pressure filled in the gas chamber 4, but the diaphragm 3 plays the role of a pressure partition. The higher the gas pressure, the higher the gas pressure
It requires a diaphragm having a thickness that can secure the strength to withstand the pressure.

For this reason, even if the tip of the needle 8 collides with and ruptures the diaphragm 3, a sufficient rupture hole cannot be obtained due to the thickness of the diaphragm 3, and the diaphragm 3 tends to rupture along the needle shape.

Therefore, when the high-pressure gas expands, the guide cylinder 2
In addition to the fact that a sufficient opening area to the side cannot be obtained, the area is not stable, and as a result, the desired high speed cannot be obtained, and the speed variation becomes large, resulting in a problem that the experimental efficiency becomes extremely poor. there were.

An object of the present invention is to solve such a problem.

[0011]

According to a first aspect of the present invention, there is provided a sabot having a holding hole for holding particles at a tip end surface, a gas chamber filled with high-pressure gas, and an opening device for opening the gas chamber toward the sabot. A guide cylinder that guides the sabot, and accelerates the sabot with high-pressure gas, and collides against a stopper provided at the tip of the guide cylinder to eject particles in the holding hole. It is formed by a valve with a shaft having a spherical valve body at the tip of a shaft movable in the cylinder direction, and a valve seat of the spherical valve body provided at the opening of the partition wall of the gas chamber.

According to a second aspect of the present invention, there is provided an opening mechanism for urging the valve with a shaft of the opening device to a valve seat via an elastic member and for urging the valve with a shaft to open.

According to a third aspect of the present invention, a throttle portion is provided between the opening device and the guide tube so as to be exchangeable.

[0014]

The valve with a spherical valve element starts to open and separates from the valve seat of the partition wall, and the valve opening area (the area of the gap between the spherical valve element and the valve seat) immediately reaches a certain area. .

Therefore, by opening the valve with a shaft, the high-pressure gas in the gas chamber rapidly flows into the guide cylinder side while expanding from the opening having a predetermined area. Accelerated to speed.

If the valve with shaft is opened by an impulse, the valve opens at a higher speed, so that the high-pressure gas in the gas chamber flows into the guide cylinder from the opening more rapidly.

Further, if a throttle valve is provided between the guide cylinder and the guide cylinder,
The flow rate of the high-pressure gas into the guide cylinder can be accurately set.

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a first embodiment, in which reference numeral 20 denotes a sabot for holding particles made of a hard material in a holding hole opened on the distal end surface, and reference numeral 21 denotes a sabot 20 loaded in a base end discharge port. The guide cylinder 22 is a gas chamber that is filled with high-pressure gas (helium gas) from a cylinder 23 via a valve 24 at the rear side of the guide cylinder 21.

The gas chamber 22 is formed in a housing 25 that supports the proximal end of the guide cylinder 21, and a partition wall 26 is disposed on the guide cylinder 21 side of the gas chamber 22.

An opening device 27 for opening the gas chamber 22 is provided.

The opening device 27 comprises a valve 30 with a shaft provided with a spherical valve body 29 at the tip of a shaft 28 and a valve seat 31 of the spherical valve body 29. The valve 30 with a shaft passes through the housing 25. The actuator 32 is connected to the rear end of the shaft 28 so as to be movable in the direction of the guide cylinder 21.

The valve seat 31 is provided on the periphery of the opening 33 having a predetermined area provided in the center of the partition wall 26, and is formed in a conical shape in which the spherical valve body 29 of the valve 30 with a shaft is tightly adhered. Is done.

As the actuator 32, an electromagnetic or pneumatic actuator having a high operating speed is used. When a firing button (not shown) is pressed, the actuator 32 is operated, and the valve with shaft 30 is pulled in the opening direction.

An annular stopper 34 is provided at the tip of the guide tube 21. The passing speed of the sabot 20 is controlled by a magnet 35 attached to the sabot 20, a coil 36 disposed in the guide tube 21 and an oscilloscope 37. It is measured using 38 and 39 are O-rings and 40 is a sample piece.

In such a configuration, the sabot 20 holding the particles in the holding holes is loaded into the discharge port at the base end of the guide cylinder 21, and after the high-pressure gas in the cylinder 23 is charged into the gas chamber 22 to a predetermined pressure, the valve 24 is closed to complete the setting.

Then, when a fire button (not shown) is pressed,
Actuator 32 operates to pull valve 30 with a shaft, and opening 33 of partition wall 26 is opened.
At this time, the spherical valve body 2
As soon as 9 moves away from the valve seat 31 of the opening 33, the valve opening area (the area of the gap between the spherical valve body and the valve seat) reaches a certain area.

For this reason, the high-pressure gas in the gas chamber 22 rapidly flows into the guide cylinder 21 side while expanding from the opening 33 of the partition wall 28, and accelerates the Sabot 20 at high speed.

FIGS. 2 and 3A show the movement of the shafted valve 30 and the change over time of the valve opening area. The valve opening area is uniquely determined with respect to the movement of the shafted valve 30. With the movement, the valve opening area quickly reaches the fully opened state.

Therefore, the speed of the sabot 20 is accelerated to a high speed according to the set gas pressure of the gas chamber 22 without variation. Then, the accelerated Sabot 20 collides with the stopper 34 provided at the tip of the guide cylinder 21 and stops, while the particles held by the Sabot 20 fly forward from the holding hole at a predetermined high speed by inertia force, It is collided with the sample piece 40.

As described above, the required high particle velocity and the stability of the particle velocity are ensured, and the reproducibility thereof is guaranteed. As a result, the experimental efficiency is improved, and the high reliability as a test apparatus is obtained. Can be.

Since the opening device 27 does not need to be replaced unlike the conventional diaphragm, the cost can be reduced.

FIG. 4 shows a second embodiment, in which a shaft-mounted valve 51 of an opening device 50 is opened by impact.

The spherical valve body 29 is connected to the valve 51 with a shaft via a retainer 53 provided on the shaft 52.
A spring 54 biasing the shaft 52 is interposed, and a disk-shaped flange portion 55 is formed at the rear end of the shaft 52.

A cylindrical hook 57 forming an opening mechanism is provided at the rod end of an actuator 56 for operating the valve 51 with a shaft. The flange portion 55 has a predetermined gap in the hook 57 in the axial direction. It is loosely fitted.

The other structure is the same as that of FIG.

That is, when a fire button (not shown) is pressed, the hook 57 is retracted by the operation of the actuator 56. At this time, when the actuator 56 starts to move and the speed of the hook 57 increases to some extent, the hook 57 The collision with the flange portion 55 of the shaft-mounted valve 51 causes the shaft-mounted valve 51 to be pulled.

According to this, as shown in FIGS. 2 and 3B, a high valve opening speed of the shafted valve 51 is secured, and the valve opening area is instantaneously fully opened. Suddenly flows into the guide cylinder 21 side, and higher speed acceleration of the sabot 20 is obtained.

In particular, in this case, since the maximum acceleration state is entered from the beginning of the valve opening, a higher particle velocity can be obtained and a more stable particle ejection velocity can be secured.

FIGS. 5 and 6 show another embodiment in which a throttle portion is provided between the opening device 60 and the guide cylinder 61, respectively.

FIG. 5 shows a case where a circular diaphragm plate 62 is exchangeably fitted to the base end of the guide cylinder 61. FIG. 6 shows a case where a diaphragm 65 is formed in the opening 64 of the partition wall 63, and the whole partition wall 63 is replaceable. It has become.

Reference numerals 66 and 67 are O-rings.

According to this, as the aperture diameter becomes smaller, the speed of the sabot 20 is reduced as shown in FIG. 7, but the speed of the sabot 20 can be set in a wide range by replacement thereof, and the speed of the sabot 20 can be set. Can be controlled accurately.

[0044]

As described above, the first aspect of the present invention relates to a sabot having a holding hole for holding particles at its tip end surface, a gas chamber for filling high-pressure gas, and an opening device for opening the gas chamber toward the sabot. A guide cylinder that guides the sabot, and accelerates the sabot with high-pressure gas, and collides against a stopper provided at the tip of the guide cylinder to eject particles in the holding hole. Since it is formed of a valve with a shaft having a spherical valve body at the tip of a shaft movable in the cylinder direction and a valve seat of the spherical valve body provided at the opening of the partition wall of the gas chamber, the release of high-pressure gas At the same time, the Sabot is accurately accelerated, and the required particle velocity can be obtained stably and easily, and the experimental efficiency and reliability are greatly improved.

Further, in the second invention, the opening mechanism for urging the shaft-mounted valve of the opening device to the valve seat portion via the elastic member and for urging the shaft-mounted valve to the open side is provided. The gas is released instantaneously, resulting in a higher speed acceleration of the sabot.

According to the third aspect of the present invention, the throttle portion is freely exchanged between the opening device and the guide cylinder, so that the speed of the sabot can be set over a wide range and with high accuracy.

[Brief description of the drawings]

FIG. 1 is an overall schematic configuration diagram.

FIG. 2 is a characteristic diagram showing a valve moving speed.

FIG. 3 is a characteristic diagram showing a time change of a valve opening area.

FIG. 4 is a schematic configuration diagram of another embodiment.

FIG. 5 is a partial sectional view of another embodiment.

FIG. 6 is a partial cross-sectional view of another embodiment.

FIG. 7 is a graph showing the relationship between the aperture diameter and the speed of the Sabot.

FIG. 8 is a schematic configuration diagram of a related art.

[Explanation of symbols]

 Reference Signs List 20 Sabot 21 Guide cylinder 22 Gas chamber 26 Partition wall 27 Opening device 29 Valve element 30 Shaft-mounted valve 31 Valve seat 32 Actuator 33 Opening 34 Stopper 50 Opening device 51 Shaft-mounted valve 52 Filter 54 Spring 55 Flange 56 Actuator 57 Hook Reference Signs List 60 opening device 61 guide cylinder 62 aperture plate 63 partition wall 64 opening 65 aperture

──────────────────────────────────────────────────続 き Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G01N 3/00-3/62 G01M 7/00

Claims (3)

(57) [Claims] 1. A sabot having a holding hole for holding particles at an end surface thereof, a gas chamber filled with high-pressure gas, an opening device for opening the gas chamber toward the sabot, and a guide cylinder for guiding the sabot. In a particle collision test apparatus that accelerates the Sabot with high-pressure gas and collides with a stopper provided at the tip of the guide cylinder to eject particles in the holding hole, the opening device has a spherical tip at a shaft end movable in the guide cylinder direction. A particle collision test apparatus comprising: a shaft-equipped valve having the following valve body; and a valve seat of the spherical valve body provided at an opening of a partition wall of the gas chamber. 2. The valve with a shaft of the opening device is provided with an opening mechanism which is urged to a valve seat via an elastic member and urges the valve with a shaft to the open side. A particle collision test apparatus according to item 1. 3. The particle collision test apparatus according to claim 1, wherein a throttle portion is provided between the opening device and the guide cylinder, and the throttle portion is freely replaceable.