JPH06337233A - Vibrating fatigue testing machine - Google Patents

Abstract

PURPOSE:To provide a vibrating fatigue testing machine which can accurately measure a change in physical properties by applying a load which is gradually increased to a sample without abruptly applying an excess load even immediately after an operation of the machine is started. CONSTITUTION:A vibrating fatigue testing machine has a mechanism for generating a vibration by rotating an unbalance pendulum 3 by a motor 6 to apply a load to a sample 1 mounted in a sample holder 2. The machine has a mechanism for rotating a rotor 7 of the pendulum 3 to generate a vibration by a centrifugal force, restricting a horizontal component force of the force by a horizontal restraint spring 4 to output a vertical component force, and applying a load to the sample 1 by transmitting the vertical force to one end of the holder 2. Viscous material 10 is sealed in the rotor 7 of the pendulum 3, a movement of a weight 8 is alleviated by its resistance to prevent the force from being abruptly increased, thereby preventing an abrupt application of an excess load to the sample 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration fatigue tester for measuring changes in physical properties by continuously applying vibration to a sample for a long period of time.

[0002]

2. Description of the Related Art FIG. 3 is a block diagram of a conventional vibration fatigue tester, and FIG. 4 is a block diagram of an unbalanced pendulum used in the conventional vibration fatigue tester. Here, 1 is a sample, 2 is a sample holder, 3 is an unbalanced pendulum, 4 is a horizontal restraining spring, 5
Is a load spring, 6 is a motor, 7 is a rotor, and 8 is a weight. The vibration fatigue tester mainly comprises a sample holder 2, an unbalanced pendulum 3, a horizontal restraining spring 4, a load spring 5 and a motor 6. By rotating the unbalanced pendulum 3 with the motor 6, vibration is generated and a load is applied to the sample 1 mounted on the sample holder 2. The unbalanced pendulum 3 is mainly composed of a rotor 7 and a weight 8. The rotor 7 having a weight 8 attached to one end is rotated to generate vibration by centrifugal force, and the horizontal component force of the centrifugal force is restrained by the horizontal restraining spring 4 to take out the vertical component force.
The component force in the vertical direction is transmitted to one end of the sample holder 2 to apply a load to the sample.

[0003]

According to the prior art,
When the unbalanced pendulum rotates at a constant number of rotations, a stable load can be continuously applied to the sample, but immediately after the tester starts operating, the rotational speed of the unbalanced pendulum increases rapidly, so an excessive load is applied. It will be given to the sample. As a result, the sample may be destroyed, or an unstable load may be applied even if it is not destroyed, and changes in the physical properties of the sample cannot be accurately measured immediately after the tester starts operating. It was

The present invention has been made in order to solve the above problems, and its purpose is to increase the load gradually without giving an excessively large load to the sample immediately after the operation of the tester is started. It is an object of the present invention to provide a vibration fatigue tester capable of accurately measuring changes in physical properties by applying the above-mentioned to a sample.

[0005]

The vibration fatigue tester of the present invention relieves the movement of the unbalanced weight by enclosing a viscous substance in the rotor of the unbalanced pendulum, and suddenly becomes excessively large immediately after the start of operation. The change in physical properties is accurately measured by applying a gradually increasing load to the sample without applying a different load to the sample.

[0006]

By encapsulating a viscous substance in the rotor of the unbalanced pendulum, in the vibration fatigue testing machine according to the conventional technique, a load that is rapidly increased immediately after the operation of the testing machine is started as shown in FIG. On the other hand, as shown in FIG. 6, immediately after the operation of the tester is started, a load that gradually increases over time is applied to the sample.

[0007]

1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a block diagram of an unbalanced pendulum used in a vibration fatigue tester of the present invention. Here, 1 is a sample, 2 is a sample holder, 3 is an unbalanced pendulum, 4 is a horizontal restraining spring, 5 is a load spring, 6 is a motor, 7 is a rotor, 8 is a weight, 9 is a piston, 10 is a viscous substance. Is. The vibration fatigue tester mainly comprises a sample holder 2, an unbalanced pendulum 3, a horizontal restraining spring 4, a load spring 5 and a motor 6. Vibration is generated by rotating the unbalanced pendulum 3 with the motor 6,
The mechanism is such that a load is applied to the sample 1 mounted on the sample holder 2. The unbalanced pendulum 3 mainly consists of the rotor 7 and the weight 8
And a piston 9 and a viscous substance 10. A piston 9 is built in a cylindrical rotor, and a rotor 7 having a weight 8 attached to one end of the piston 9 is rotated to generate vibration by centrifugal force, and the horizontal component force of the centrifugal force is generated. The restraint spring 4 restrains the vertical component force, and this vertical component force is transmitted to one end of the sample holder 2 to apply a load to the sample. Before starting the operation of the tester, the piston 9 is pushed toward the innermost part of the rotor 7 to bring the unbalanced pendulum 3 into the equilibrium position. Immediately after the operation of the tester starts, the weight of the unbalanced pendulum 3 is not uniform, so that the weight 8 and the piston 9 move outward due to centrifugal force as the rotor 7 rotates. In the unbalanced pendulum 3 used in the vibration fatigue tester of the present invention, the resistance of the viscous material 10 slows the movement of the piston 9, and the load applied to the sample 1 is the unbalanced pendulum 3 used in the conventional vibration fatigue tester. It gradually increases over a long period of time. After this, the unbalanced pendulum 3 continues to apply a constant load to the sample.

[0008]

As described above, according to the present invention, a load gradually increasing is applied to the sample immediately after the operation of the tester is started without suddenly applying an excessive load to the sample. As a result, it becomes possible to accurately measure changes in physical property values without damaging the sample or applying an unstable load to the sample.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is a configuration diagram of an unbalanced pendulum used in the vibration fatigue tester according to the present invention.

FIG. 3 is a configuration diagram of a vibration fatigue testing machine according to a conventional technique.

FIG. 4 is a configuration diagram of an unbalanced pendulum used in a vibration fatigue testing machine according to a conventional technique.

FIG. 5 is a graph of a load value applied to a sample by a conventional vibration fatigue tester.

FIG. 6 is a graph of a load value applied to a sample by the vibration fatigue testing machine of the present invention.

[Explanation of symbols]

 1 sample 2 sample holder 3 unbalanced pendulum 4 horizontal restraining spring 5 load spring 6 motor 7 rotor 8 weight 9 piston 10 viscous material

Claims (1)

[Claims] 1. A method for measuring changes in physical properties of a sample,
A vibration fatigue tester equipped with an unbalanced pendulum, characterized in that a viscous material is enclosed in the rotor of the unbalanced pendulum consisting of a rotor, a weight and a piston.