JPH037805Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a high-temperature fatigue testing machine that heats a test piece and then applies a repeated load to the test piece.

[Conventional technology and problems]

First, a conventional high-temperature fatigue testing machine of this type will be explained with reference to FIG.

In FIG. 2, a fixed shaft 3 is supported on a fixed base 1 via a load cell 2.
A gripper 5 for gripping one end of the test piece 4 is protruded from the tip of the test piece 4 . On the other hand, the intermediate part of a lever 9 is connected via a support part 8 to the proximal end of a movable shaft 7 from which a gripper 6 for gripping the other end of the test piece 4 is protruded. A spring fulcrum 10 is provided in the section. Further, a drive device 13 is connected to the other end of the lever 9 via an eccentric cam 11 and a clutch 12.
The lever 9 is driven by the lever 9 to apply a repeated load or the like to the test piece 4.

Further, the test piece 4 is placed in a heating furnace 14, and the test piece 4 is heated to a predetermined temperature by the heating furnace 14 to perform a high temperature fatigue test. Furthermore, cold water pipes 15 and 16 are wound around the outer peripheries of the fixed shaft 3 and the movable shaft 7, respectively, so that the heat of the heating furnace 14 is not conducted to the load cell 2, the support portion 8, etc.

According to the above-described configuration, a high-temperature fatigue test is performed on the test piece 4 by heating the test piece 4 in a heating furnace and then driving the lever 9 with the driving device 13 to apply a repetitive load or the like to the test piece 4. I can do it.

However, in such a conventional high-temperature fatigue testing machine, the heat of the heating furnace 14 for heating the test piece 4 escapes from the fixed shaft 3 and the movable shaft 7 toward the load cell 2 and the support section 8.
In addition, in order to prevent heat from being transferred to the load cell 2, the support part 8, etc., the cold water pipes 15, 16 and the inside of the cold water pipes 15, 16 are heated to a predetermined temperature. The problem was that a cooling device was required to cool the water passing through it, making the equipment expensive.

[Purpose of invention]

In view of these points, it is an object of the present invention to provide a high-temperature fatigue testing machine that can reduce the power consumption of a heating furnace compared to conventional ones, and can also reduce equipment costs.

[Summary of the idea]

In this invention, one of a pair of test machine shafts connected to a test piece is fixed via a load detection device, a drive device is connected to the other test machine shaft, and a means for heating the test piece is further provided. In the testing machine, each testing machine shaft is formed into an inner and outer double shaft, and the double shaft is divided in the axial direction to form a pair of double shaft parts, and the space between the divided ends of both double shaft parts is It is characterized in that the two shafts are separated from each other and then connected by bolts through a heat insulating material, and an adjustment bolt for eliminating play is provided at the end of the double shaft portion on the side that is spaced from the test piece.

[Example of idea]

The present invention will be explained below with reference to embodiments shown in the drawings.

FIG. 1 shows an embodiment of the present invention, and this figure shows the main parts of a high temperature fatigue testing machine.

In FIG. 1, both ends of a test piece 4 placed in a heating furnace 14 are held by gripping tools 20, 21, and each gripping tool 20, 21 is connected to a fixed shaft 22 and a movable shaft 23, which are the test machine axes. Although the fixed shaft 22 and 23 have the same structure, only the fixed shaft 22 will be described. In addition, the movable shaft 23
A lever (not shown) is connected to the lever, and this lever is connected to a drive device via an eccentric cam and a clutch, but since these structures are the same as those shown in FIG. 2, illustration thereof is omitted.

A load cell 2 is attached to the fixed base 1, and an end of a fixed shaft 22 is fixed to the load cell 2. This fixed shaft 22 is composed of two shaft parts 24A, 24B divided in the axial direction, and each shaft part 24A, 24B is composed of an outer shaft 25A, 25B and an inner shaft that are relatively movable in the axial direction. 26
A and 26B form a double shaft portion. The outer shaft 25A of the first double shaft portion 24A is fixed to the load cell 2, and the first double shaft portion 24A is inserted through the through holes 27 and 28 formed in the load cell 2 and the fixing base 1. It extends in the gripper 20 direction. Inner shaft 26A of this first double shaft portion 24A
The end on the load cell 2 side is the female thread 29 of the outer shaft 25A.
An adjustment bolt 30 is screwed into the adjustment bolt 30, and by rotating a knob 31 of the adjustment bolt 30, the inner shaft 26A is moved in the axial direction with respect to the outer shaft 25A. This movement adjustment is performed in order to eliminate the gap between the inner shafts 26A and 26B that occurred during the test.

The opposing ends of the inner shafts 26A, 26B end inside the opposing ends of the inner shafts 26A, 26B,
Both outer shafts 25A, 25 are connected between both inner shafts 26A, 26B.
A cylindrical heat insulating material 33 is interposed to be supported at the ends of the through holes 32A and 32B of B.
This heat insulating material is made of a material having sufficient strength and high heat insulating properties, such as ceramic.

Further, the opposing ends of the outer shafts 25A, 25B are spaced apart in the axial direction, and flanges 34A, 34B are provided on the outer peripheries of the opposing ends of the outer shafts 25A, 25B.
are fixed, among which the first double shaft portion 24A
A plurality of screw holes 35, 35... are formed in the flange 34A of the outer shaft 25A of the second double shaft portion 24B at intervals in the circumferential direction. A plurality of holes 36, 36, . . . are formed coaxially with the hole 35. Furthermore, both flanges 34A, 34B have grooves 37A, 37A located around the screw hole 35 and the screw hole 36,
37B, 37B... are formed. Then, a collar 38 made of a heat insulating material such as ceramic is fitted into these grooves 37A and 37B to connect both outer shafts 2.
5A and 25B, and then open the hole 3 of the flange 34B of the outer shaft 25B of the second double shaft portion 24B.
Insert the bolt 39 from 6 to the first double shaft portion 24A.
By screwing the bolt 39 into the screw hole 35 of the flange 34A of the outer shaft 25A, both outer shafts 25A, 2
5B is connected. In addition, the head 40 of the bolt 39
A washer 41 and a collar 42 made of a heat insulating material such as ceramic are interposed between the outer shaft 25B and the flange 34B, respectively, to prevent heat from being conducted from the outer shaft 25B to the outer shaft 25A via the bolt 39.

A male thread 43 is formed at the tip of the outer shaft 25B of the second double shaft portion 24B.
3 is screwed into a female thread 45 formed in the cylindrical body 44 of the gripper 20. On the other hand, the test piece 4
A nut 46 is screwed onto the end of the main body 44, and this nut 46 engages with a stepped portion 47 formed in the main body 44, and is held under pressure by the inner shaft 26B of the second double shaft portion 24B.

According to the above-described configuration, even when the test piece 4 is heated in the heating furnace 14 in order to perform a high temperature fatigue test on the test piece 4, this heat is transferred to the collars 38 and 4 made of a heat insulating material.
1 and is not transmitted to the first double shaft portion 24A, no temperature error occurs in the load cell 2, and the power consumption of the heating furnace 14 is also reduced.
Furthermore, since cold water pipes like conventional ones are not required, equipment costs are also reduced. Furthermore, even if a gap occurs between the inner shafts 26A and 26B during the test, it can be removed by tightening the adjusting bolt 30.

[Effect of idea]

As explained above, the high temperature fatigue tester according to the present invention fixes one of the pair of tester shafts connected to the test piece via the load detection device, and connects the drive device to the other of the tester shafts, Furthermore, in a high-temperature fatigue testing machine equipped with a heating means for the test piece, each testing machine shaft is formed into an inner and outer double shaft, and the double shaft is divided in the axial direction to form a pair of double shaft parts. , the split ends of both double shaft parts are separated and connected by bolts through a heat insulating material, and an adjustment is made to remove play at the end of the double shaft part on the side that is spaced from the test piece. Since the bolt is provided, not only can power consumption be reduced, but equipment costs can also be reduced, and the entire device can be made smaller, which is an excellent effect.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of essential parts showing an embodiment of a high temperature fatigue testing machine according to the present invention, and FIG. 2 is an explanatory diagram showing a conventional high temperature fatigue testing machine. 1... Fixed table, 2... Load cell, 4... Test piece, 20, 21... Gripping tool, 22... Fixed shaft, 2
3...Movable shaft, 24A, 24B...Double shaft part, 2
5A, 25B...Outer shaft, 26A, 26B...Inner shaft, 30...Adjustment bolt, 33...Insulation material, 34
A, 34B...Flange, 38, 42...Collar, 39...Bolt, 44...Gripper body, 46
...Natsuto.

Claims (1)

[Scope of utility model registration request] In a high temperature fatigue testing machine, one of a pair of test machine shafts connected to a test piece is fixed via a load detection device, a drive device is connected to the other of the test machine shafts, and a means for heating the test piece is further provided. Each test machine shaft was formed into an inner and outer double shaft, and the double shaft was divided in the axial direction to form a pair of double shaft parts, and the divided ends of both double shaft parts were spaced apart. A high-temperature fatigue testing machine, characterized in that the two shaft parts are connected by bolts through a heat insulating material, and an adjustment bolt for removing clearance is provided at the end of the double shaft part on the side remote from the test piece.