Electro-hydraulic type high-frequency fatigue testing machine and design method thereof

Abstract

The invention discloses a fatigue testing machine and a design method thereof. An electro-hydraulic type high-frequency fatigue testing machine comprises a movable disk and a static disk which are in contact with each other from the end surfaces, wherein shells are arranged outside the movable disk and the static disk for sealing the movable disk and the static disk; the contact end surface of the movable disk is hinged to a plurality of circular movable disk pressure oil holes and movable disk oil return holes; static disk pressure oil holes and static disk oil return holes are formed in the static disk end surface in contact with the movable disk; the oil holes in the static disk correspond to the oil holes in the movable disk; when the movable disk rotates, the movable disk pressure oil holes and the movable disk oil return holes can be respectively communicated with the static disk pressure oil holes and the static disk oil return holes; a channel for pumping pressure oil into the end face and a device for controlling the pressure oil amount of the channel are arranged on the end part, which is far away from the movable disk, of the static disk. The high-frequency generator of the testing machine is reasonable in structural design and favorable for processing and high-frequency demand implementation; furthermore, the sealing pressure on the movable disk and the static disk in the high-frequency generator can be adjusted, so that the driving power of a servo motor and the energy loss can be reduced.

Description

technical field [0001] The invention relates to a fatigue testing machine, in particular to an electro-hydraulic high-frequency fatigue testing machine and a design method thereof. Background technique [0002] Ordinary hydraulic fatigue testing machines usually control the reciprocating motion of the actuator with a certain pressure and a certain flow of hydraulic oil through the servo valve, and alternately pull and compress the load on the specimen to realize the fatigue test. The actuator is a high-precision double-rod double-extension fully symmetrical oil cylinder. A load sensor is installed at the front end of the actuator to detect the load force value, and a hysteresis displacement sensor (or external LVDT displacement sensor) is installed at the end of the actuator. sensor) to detect the displacement (or amplitude) of the movement; through the measurement and control system, the load force or displacement (amplitude) value can be selected to control reciprocating l...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the oil hole design of the arc-shaped grooves on the moving disk and the static disk existing in the prior art. Due to the requirement of high-frequency vibration of the high-frequency generator, and the lack of uncontrollable sealing force of the joint surface of the moving plate and the static plate, an electro-hydraulic high-frequency fatigue testing machine is provided. The structural design of the high-frequency generator of the testing machine is more Reasonable, conducive to processing and realizing high-frequency requirements, and can also adjust the sealing pressure of the dynamic and static discs in the high-frequency generator to reduce the loss of drive power and energy consumption of the servo motor

Images