JP2568771Y2 - Material testing machine chuck device - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a chuck device of a material testing machine installed in a special atmosphere chamber for radiation or the like, and in particular, to a test piece by remote control using a manipulator from outside the atmosphere chamber. The chuck device of the material testing machine which can be mounted on the chuck device, and can be pulled by the load device of the material testing machine while applying a pressing force to the mounted test piece to apply a compressive load. About.

(Prior Art) Generally, in a material test, it is necessary to firmly grip a test piece in order to apply a load such as tension, compression, and torsion to a material. In an atmosphere chamber that does not pose a danger to the human body, the test piece may be manually chucked with a bolt or hydraulic pressure, and then only the test piece may be surrounded by a specific environmental atmosphere such as high temperature, vacuum, or high pressure.

However, in a material testing machine installed in an atmosphere chamber that poses a danger to the human body due to radiation or the like, the test piece must be mounted on the chuck device from outside the atmosphere chamber. Also, in a high temperature environment, the chuck body and the test piece gripper itself are thermally expanded or plastically deformed, causing loosening of chucking,
There was a problem that an accurate test load could not be applied.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides an environment tank capable of forming a predetermined atmosphere for a material test therein, and an externally inserted inside the environment tank. A load rod connected to a load device of a test machine, a pressing rod which is built inside the load rod so as to be movable in the axial direction, and which can be pressed toward the distal end side of the load rod, and is connected to a distal end of the load rod. A chuck body having a cavity capable of accommodating the gripping portion of the test piece from the side and having a guide portion for centering the test piece, so that the pressing rod can apply a load to the end of the test piece. And a chuck device for a material testing machine.

Hereinafter, in this specification, the load applied to the end of the test piece by the pressing rod is referred to as “chucking pressing force”.

(Operation) According to the present invention, the test piece can be mounted on the chuck body coaxially with the load shaft by simple operation of the manipulator, and the chucking pressing force can be applied to the test piece. Since a constant pressing force is constantly applied to the test piece chucked to the chuck body by the piston rod, the loosening of the chuck is reliably prevented. On the other hand, when the test piece is replaced, if the chucking pressing force is removed, the test piece can be easily taken out of the chuck body by a simple operation of the manipulator.

(Example) Hereinafter, a chuck device of a material testing machine according to the present invention will be described with reference to the drawings.

FIG. 1 shows a material testing machine to which the chuck device according to the present invention is applied. The machine base 1 is provided with guide columns 2 and 2 which can be moved up and down along the guide columns 2 and 2. A simple cross beam 3 is mounted on the guide column 2. The cross beam 3 is moved up and down by hydraulic drive cylinder devices 4 on both sides.

An environmental tank 7 is provided on the machine base 1 via support legs 6, and the inside is maintained in a special atmosphere such as radiation.

An upper chuck device 8 is provided between the environmental tank 7 and the cross beam 3.
And a lower chuck device 9 is installed between the environmental tank 7 and the machine base 1. Since these chuck devices are provided vertically symmetrically and have the same configuration, the configuration of the upper chuck device 8 will be described as a representative with reference to FIGS.

The upper chuck device 8 has a load device 10 fixed to the cross beam 3, and a load rod 11 is connected to a lower end surface thereof. The load rod 11 penetrates the top wall of the environmental tank 7, and a seal ring 12 is disposed in the penetrating portion. Furthermore, the upper surface of the seal ring 12 and the flange 11 of the load rod 11
A bellows 14 which is extendable and contractible in the axial direction is disposed between the bellows 14 and a, and the airtightness in the environmental tank 7 is maintained.

A chuck body 15 is screwed to the lower end surface of the load rod 11, and a test piece is provided in the chuck body 15.
A cavity 17 that can accommodate 16 heads 16a is formed. One side of the cavity 17 is formed with a T-shaped notch 18 that can accommodate the test piece 16 from the side. In addition, a conical guide portion 19 is formed below the cavity 17,
The center of the test piece 16 automatically matches the center of the chuck body 15.

On the other hand, a pressing rod 20 is accommodated inside the load rod 11 so as to be movable in the axial direction, and a piston 21 at an upper end of the pressing rod 20 is accommodated in a cylinder chamber 22 and a piston 21
A spring 23 is incorporated at the lower end of the housing. A pressure oil supply port 24 is open in the cylinder chamber 22.

The pressing rod 20 extends through the load rod 11 and into the cavity 17 of the chuck body 15. The pressing rod 20 is always urged by a coil spring 23,
When pressure oil is sent from the supply port 24 into the
Is pushed inward of the environmental tank 7A against the spring force of the coil spring 23.

As shown in FIG. 1, the chuck device is provided as a pair on both sides of the environmental tank 7 and is configured to chuck both ends of the test piece 16.

Next, the operation of the chuck device of the material testing machine according to the present embodiment will be described.

The test piece 16 is grasped by the hand of the manipulator, the test piece 16 is inserted into the cavity 17 from the side through the notch 18 of the chuck body 15, and the load rod 11 is moved by operating the material testing machine, and the head of the test piece 16 is moved. 16a is dropped into the guide part 19. In this state, the test piece 16 is mounted coaxially with the load rod 11 and the chuck body 15. Next, pressure oil is fed from the supply port 24 into the hydraulic chamber 22, and the pressing rod 20 is pressed down to press the end of the test piece 16. This pressing force acts as a chucking pressing force, and the test piece 16 is fixed to the chuck body 15 without any gap. When the pressure oil is discharged from the hydraulic chamber 22, the pressing rod 20 is pushed back by the spring force of the coil spring 23.

After the test piece 16 is fixed to the chuck body 15 without any gap, the test piece 16 is fixed via the load rod 11 of the material testing machine.
, A material test can be performed.

(Effects of the Invention) As is clear from the above description, according to the present invention, the test piece can be attached to the chuck body by a simple operation of the manipulator from outside the atmosphere chamber, and the guide piece is used to center the test piece. Can be easily performed. Also, since the chucking pressing force is constantly applied to the test piece mounted on the chuck body via the piston rod by the operation of the hydraulic pressure, loosening does not occur when the test piece is chucked.

[Brief description of the drawings]

FIG. 1 is a front view showing a material testing machine to which the present invention is applied,
FIG. 2 is an enlarged longitudinal sectional view of the chuck device of the material testing machine according to the present invention, and FIG. 3 is a transverse sectional view cut along the line AA of FIG. 7 ... Environment tank, 8,9 ... Chuck device, 11 ... Load rod, 15 ... Chuck body, 16 ... Test piece, 17 ... Cavity, 18 ... Notch, 19 ... Guide, 20 ... … Pressing rod,
22 ... Hydraulic chamber, 23 ... Coil spring.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masao Omi 3607 Niibori, Narita-cho, Oarai-machi, Higashiibaraki-gun, Ibaraki Pref. Japan Atomic Energy Research Institute Oarai Research Institute (72) Inventor Tsutomu Fujii 315 Mitsui, Tsukui-cho, Tsukui-gun, Kanagawa Prefecture (72) Inventor: Tatsuya Furusawa, 315, Mitsui-cho, Tsukui-cho, Tsukui-gun, Kanagawa Pref., Japan Sagami Plant, Tokyo Koki Plant (56) References JP-A-60-66131 (JP, A) Japanese Utility Model 1-137454 (JP, U) Japanese Utility Model 48-69089 (JP, U) Japanese Utility Model 62-158347 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] An environment tank capable of forming a predetermined atmosphere for material testing therein, a load rod inserted into the environment tank from outside and connected to a load device of a material testing machine,
It is built inside the load rod so that it can move in the axial direction,
A pressure rod that can be pressed toward the distal end of the load rod;
A chuck body connected to the distal end of the load rod, having a cavity capable of receiving a gripping portion of the test piece from the side, and having a guide portion for centering the test piece; A chuck device for a material testing machine, wherein a load can be applied to one end.