Experimental device and experiment method for breaking rock by means of ultrasonic waves

Abstract

The invention discloses an experimental device and experiment method for breaking rock by means of ultrasonic waves. The device is composed of an ultrasonic generator, a vibration system and a cooling system; the vibration system comprises a Langevin vibrator, a connecting piece and a fixing device; the cooling system includes a cooling cylinder, cooling liquid and a cooling groove; the connecting piece is fixed on the Langevin vibrator by a screw, the horizontal fixing device is installed on the wall of the cooling groove, and a rock sample is bonded to the lower end of the connecting piece through strong glue. The ultrasonic generator provides power to the Langevin vibrator and drives the Langevin vibrator to work, and after being converted by the Langevin vibrator, an input electrical signal stimulates the rock sample to vibrate so as to make the rock sample damaged and broken; after being electrified, the cooling system injects the cooling liquid in the cooling cylinder in a circulating mode to cooling the Langevin vibrator. By changing the size of the rock sample, the relationship of the rock breaking effect, ultrasonic power and ultrasonic frequency can be studied, the rock sample is connected with the Langevin vibrator through the connecting piece, the vibration transmission efficiency is high, the vibrator can be used repeatedly, and the service life is long.

Description

technical field [0001] The invention belongs to the intersection field of ultrasonics and rock crushing, specifically a method of using ultrasonic waves to excite rocks to promote the development of cracks inside the rocks, damage and rupture, thereby reducing the strength of rocks to study the crushing effects of different types of rocks and ultrasonic power, frequency and rock mass. Experimental device and experimental method of inter-quantitative law. Background technique [0002] Ultrasonic wave is a form of mechanical vibration state and energy transmission. During the transmission process, it will cause the medium particles to compress and stretch alternately, resulting in pressure changes between the media. This pressure change will cause mechanical effects between the media. Studies have shown that: the ultrasonic frequency is high and the wavelength is short, and when it acts on a solid medium, the vibration acceleration of the particle is very large, and the partic...

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Problems solved by technology

[0003] The traditional drilling and blasting method has low drilling strength, slow hole forming speed, poor efficiency, difficulty in mechanical cutting and crushing when crushing hard rock, machine wear, large maintenance and low penetration rate (insufficient cutting depth), so far there is no more efficient method. There is no experimental device for crushing rocks using ultrasonic waves, and there are no systematic reports on the mechanism of rock crushing using ultrasonic excitation at home and abroad. The relevant research is still in the exploratory test stage.

When the applicant used water to directly cool the Langevin vibrator in the exploratory test of using ultrasonic excitation to break rocks, cavitation would occur on the surface of the test piece, which would affect the experimental results.

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