JPH0228434Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention relates to a thermal fatigue testing machine that tests specimens for thermal fatigue in an atmospheric chamber such as a vacuum chamber.

(b) Prior Art For example, when a test piece is subjected to a thermal fatigue test in a vacuum chamber, a method is generally adopted in which the test piece is heated by high-frequency induction using a heating coil. To perform high-frequency induction heating, a test piece is placed in a vacuum chamber, a high-frequency induction heating coil is held by a holding member such as a heating coil introduction rod, and this heating coil holding member is installed on the wall of the vacuum chamber. Then, the heating coil of the holding member may be projected into the vacuum chamber. When a heating coil is wound around a test piece in a vacuum chamber and both ends of the test piece are gripped by a pair of grips, the test piece can be heated by high frequency induction by the heating coil. Therefore, the specimen can be subjected to a thermal fatigue test in a vacuum chamber.

In this type of thermal fatigue testing machine, when removing a tested specimen from between the grips, conventionally the heating coil was once removed from the heating coil holding member on the wall of the vacuum chamber. Then, the wound portion of the heating coil is unwound around the test piece. Thereafter, the test piece was removed from between the grips. However, the space within the vacuum chamber is small, and it is not easy to remove the heating coil from the heating coil holding member on the wall thereof. It is also not easy to unwind the wound part of the heating coil from around the test piece. Furthermore, in order to test the next test piece, the heating coil must be wound around the test piece placed between the grips and reconnected to the heating coil holding member. Therefore, there was a problem of poor workability.

In addition, when a test piece is heated by high-frequency induction, the heating coil itself is also heated, and the wound portion of the heating coil may be damaged by the heat. For this reason, cooling water is usually circulated within the heating coil to cool the wound portion thereof. Therefore, when the heating coil is removed from its holding member, cooling water inevitably leaks from the heating coil and flows into the vacuum chamber. Therefore, there was a problem in that the cooling water evaporated within the vacuum chamber, and the vapor affected the degree of vacuum of the vacuum chamber.

(c) Purpose Therefore, this invention eliminates the need to remove the heating coil from the heating coil holding member on the wall of the atmosphere chamber in a thermal fatigue tester that tests specimens for thermal fatigue in an atmosphere chamber such as a vacuum chamber. This was made with the aim of solving the above-mentioned conventional problems.

(d) Configuration This device guides a heating coil holding member that holds a high-frequency induction heating coil so that it can be displaced against the wall surface of an atmosphere chamber, and when a test piece is placed between the grips and removed from between the grips, the heating coil is held in place. The member is displaced relative to the wall of the atmosphere chamber. This feature is characterized in that the wound portion of the heating coil is retracted from between the grips.

(E) Embodiments Hereinafter, embodiments of this invention will be explained with reference to the drawings.

In the figure, a test piece 1 is placed in a vacuum chamber 2, and both ends thereof are held by half-split mounting flanges 4 and bolts 5 of a pair of upper and lower grips 3. The vacuum chamber 2 is shielded by a lid plate 6.

The high-frequency induction heating coil 7 is inserted into the inner hole of the coil introduction rod 8 and is held by the introduction rod 8. A coil introduction rod 8 is mounted on the wall 9 of the vacuum chamber 2, and the heating coil 7 is connected to the transformer 11 by a connector 10. The heating coil 7 of the introduction rod 8 protrudes into the vacuum chamber 2, and the heating coil 7 is wound around the test piece 1 within the vacuum chamber 2. Winding portion 7a of heating coil 7
is cooled by cooling water introduced from the inlet/outlet 12 of the heating coil 7.

In this embodiment, the coil introduction rod 8 is inserted into the inner hole of the boss 13 and equipped. The boss 13 is attached and fixed to the wall surface 9 of the vacuum chamber 2 by bolts 14. Then, the key 15 of the boss 13 is fitted into the key groove 16 of the coil introduction rod 8, and the coil introduction rod 8 is inserted into the key 15 and the key groove 16.
6 so that it can be displaced in the axial direction relative to the wall surface 9. The space between the coil introduction rod 8 and the boss 13 is sealed by an O-ring 17. heating coil 7
The same applies to the space between the coil introduction rod 8 and the boss 13, and the space between the boss 13 and the wall surface 9, which are each sealed with an O-ring 17.

The coil introduction rod 8 is operated by an operating nut 19 having a handle 18. The operating nut 19 is screwed onto the outer peripheral thread 20 of the coil introduction rod 8,
It is attached to the boss 13 by a holder 21 and is rotatably guided.

The transformer 11 is engaged with rollers 23 of the table 22 and is guided movably in the axial direction of the coil introduction rod 8 by the rollers 23.

In the thermal fatigue testing machine configured as described above, when current is passed through the heating coil 7 by the transformer 11, the test piece 1 is heated by high frequency induction by the heating coil 7. Therefore, vacuum chamber 2
The test piece 1 can be subjected to a thermal fatigue test within the test chamber. The cooling water for the heating coil 7 is supplied through the inlet/outlet 12 of the heating coil 7.
It is introduced from the heating coil 7 and circulates within the heating coil 7. Therefore, the winding portion 7a of the heating coil 7 is cooled by the cooling water, and damage to the winding portion 7a is prevented.

This testing machine holds the tested specimen 1 in gripping tool 3.
There is no need to remove the heating coil 7 from the coil introduction rod 8 when removing it from between. To remove the test piece 1 from between the grips 3, open the lid plate 6 of the vacuum chamber 2. Then, the bolts 5 of the grip 3 are removed, and the half flange 4 is separated from the grip 3 and separated from the test piece 1. Thereafter, the test piece 1 may be held by hand or an instrument, and the operating nut 19 may be rotated using the handle 18. The coil introduction rod 8 is fed by the screw feeding action of the operating nut 19, guided by the key 15 of the boss 13, and displaced in the axial direction with respect to the wall surface 9 of the vacuum chamber 2. The transformer 11 is guided by the rollers 23 of the table 22, and is connected to the connecting tool 10 and the coil introduction rod 8.
move in unison with Therefore, the winding portion 7a of the heating coil 7 is held together with the test piece 1 by the gripping tool 3.
You can evacuate from between. Thereafter, the test piece 1 may be extracted from the wound portion 7a of the heating coil 7. Thereby, the test piece 1 can be removed from between the grips 3. The wound portion 7a of the heating coil 7 can also be taken out from the lid plate 6 of the vacuum chamber 2 to the outside of the vacuum chamber 2. Therefore,
The test piece 1 is heated by a heating coil 7 outside the vacuum chamber 2.
It can also be pulled out from the winding portion 7a. Therefore, there is no need to remove the heating coil 7 from the coil introduction rod 8, which improves workability. There is also no problem of cooling water leaking from the heating coil 7.

The same applies when placing the next test piece 1 between the grips 3. When the test piece 1 is inserted into the wound part 7a of the heating coil 7 outside the vacuum chamber 2 and the coil introduction rod 8 is displaced in the axial direction by the handle 18 of the operating nut 19, the heating coil and the test piece 1 are inserted. 7 can be inserted between the grips 3. Thereafter, both ends of the test piece 1 may be gripped by the half-split flange 4 of the gripper 3 and the bolt 5. There is no need to remove the heating coil 7 from the coil introduction rod 8, and the workability is good.

Note that this invention may include various other modifications of the above embodiment. For example, coil introduction rod 8
The heating coil 7 may be held by a member having a different shape, and the coil holding member may be guided so as to be displaceable with respect to the wall surface 9 of the vacuum chamber 2. Then, when installing the test piece 1 between the grips 3 and when removing the test piece 1 from between the grips 3,
When the heating coil holding member is displaced relative to the wall surface 9 of the vacuum chamber 2, the wound portion 7a of the heating coil 7
can be evacuated from between the grips 3. Therefore, it is not necessary to remove the heating coil 7 from its holding member, and similar effects can be obtained. The heating coil holding member may be guided by a guide mechanism other than the key 15 and the keyway 16. The heating coil holding member may be displaced by an operating mechanism other than the operating nut 19. Further, in the above embodiment, a thermal fatigue tester in which the test piece 1 is placed in a vacuum chamber 2 was described, but this invention is applied to a thermal fatigue tester in which the test piece 1 is placed in an atmosphere chamber other than a vacuum chamber. You can also do that.

(F) Effects As explained above, in this invention, when a test piece is placed between the grips and removed from between the grips, the wound portion of the high-frequency heating coil can be retracted from between the grips. Therefore, there is no need to remove the heating coil from its holding member, resulting in good workability. The intended purpose can be achieved without the problem of cooling water leaking from the heating coil.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of this invention, and FIG. 2 is a sectional view taken along the line -- in FIG. DESCRIPTION OF SYMBOLS 1... Test piece, 2... Vacuum chamber, 3... Grip, 7... High frequency induction heating coil, 8... Coil introduction rod, 9... Wall of vacuum chamber, 15...
...Key, 16...Keyway, 19...Operation nut.

Claims (1)

[Scope of utility model registration request] A test piece is placed in an atmosphere chamber such as a vacuum chamber, and a heating coil holding member for holding a high frequency induction heating coil is equipped on the wall of the chamber,
The heating coil of the holding member is projected into the chamber, the heating coil is wound around the test piece within the chamber, and both ends of the test piece are gripped by a pair of grips, and the heating high-frequency induction heating of the test piece with a coil;
In a testing machine configured to perform a thermal fatigue test, the heating coil holding member is guided so as to be displaceable with respect to the wall surface of the chamber, and when the test piece is placed between the grips and removed from between the grips, the holding member is A thermal fatigue testing machine characterized in that the heating coil is displaced with respect to the wall surface of the chamber, and the wound portion of the heating coil is retracted from between the grips.