Electrohydraulic vibration exciter

Abstract

The invention discloses an electrohydraulic vibration exciter which comprises a step motor and a vibration excitation device. An accommodation cavity inside a case of the vibration excitation device is divided into a first chamber and a second chamber by a clapboard. The first chamber is divided into a rod cavity and a rodless cavity by a piston with a single-acting piston rod. A single-shoulder valve plug provided with a valve sleeve is arranged inside the second chamber and is connected with a main shaft of the step motor through a coupling. The second chamber is divided into a third cavity and a fourth cavity by the shoulder of the single-shoulder valve plug, an oil return port is arranged on the wall of the third cavity, and an oil inlet port is arranged on the wall of the fourth cavity. A first flow channel and a second flow channel are arranged on the wall of the accommodation cavity; the rodless cavity is communicated with the second chamber through the first flow channel, and the rod cavity is communicated with the oil inlet port through the second flow channel. First and second grooves which can be communicated with the first flow channel are arranged on the two sides of the shoulder of the single-shoulder valve plug along the circumferential direction at intervals. Along with the rotation of the single-shoulder valve plug, an opening at the other end of the first flow channel is communicated with either of the first and second grooves all the time.

Description

technical field [0001] The invention relates to an electro-hydraulic vibrator, which is mainly used in the technical field of engineering to realize high-speed reciprocating motion of an external load. Background technique [0002] The exciter is a device attached to the mechanical equipment to destroy the original state of the excited object and produce a certain form and size of disturbance or excitation to the excited object. It is widely used in earthquake simulation experiments, automobiles, aerospace, Performance and life fatigue tests of electromechanical systems and their components, as well as important engineering and technical fields such as mechanical tamping, vibration rock breaking and drilling. [0003] According to the different excitation methods, the exciters are mainly divided into mechanical, electric, electrostrictive or magnetostrictive effect, and electro-hydraulic exciters. And other inherent advantages are widely used in heavy load, high power o...

AI Technical Summary

Problems solved by technology

Due to the limitation of the working structure and frequency response characteristics of the servo valve, the high-frequency performance of the electro-hydraulic vibrator is poor, and the desired vibration waveform is difficult to achieve, and the waveform distortion is larger than that of the electric vibration, which is sensitive to the dynamic change of the load and the stability of the valve. To a large extent depends on the load dynamics, it is prone to instability, the whole system is complex, the cost is high, and the anti-pollution performance is also poor

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