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An ultrasonic excitation caving or coal caving device and method

An ultrasonic and ultrasonic technology, which is applied in earth drilling, surface mining, underground mining, etc., can solve the problems of complex construction steps, damage to mining equipment, and high ventilation requirements, and achieve wide practicability, smooth coal discharge, and strong penetration Effect

Active Publication Date: 2019-12-03
CHINA UNIV OF MINING & TECH
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AI Technical Summary

Problems solved by technology

Light ones cause damage to mining equipment, and severe ones cause casualties
[0003] At present, the commonly used forced caving methods are blasting caving and high-pressure water injection. The construction method of blasting caving involves explosives. During the caving process, the requirements for construction personnel and ventilation are high; especially in high-gas mines, its applicability Restricted; during the construction process of injecting high-pressure water into the roof, water supply and drilling and sealing problems need to be considered, and the construction steps are complicated

Method used

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  • An ultrasonic excitation caving or coal caving device and method
  • An ultrasonic excitation caving or coal caving device and method
  • An ultrasonic excitation caving or coal caving device and method

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Embodiment Construction

[0023] Embodiments of the invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0024] The ultrasonic excitation caving or top coal device of the present invention comprises an ultrasonic fracturing device (4), a wire (7) and an ultrasonic driving power supply (9). One end of the wire (7) is connected with the ultrasonic cracking device, and the other end is connected with the ultrasonic driving power supply (9). The ultrasonic cracking device (4) is composed of a transducer (6) and a cracking control device (A). The crack control device (A) includes a V-shaped spring piece (5) and an iron wire (12). The V-shaped spring piece (5) is welded with the transducer (6) to fix the ultrasonic cracking device (4). Described V-shaped spring leaf (5...

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Abstract

The invention discloses an ultrasonic excited roof (coal) caving apparatus and a method thereof, and belongs to the field of energy engineering. Advance boreholes are constructed in a roof (roof coal) in front of a working surface at intervals by using a drilling machine, an ultrasonic excitation device is placed in one of the boreholes, is fixed, and is used to carry out ultrasonic excited cracking on the selected borehole in order to make the roof and the roof coal have cracks, destroy the integrity of coal rocks and reduce the strength, so the weighting step and the strength of the roof are reduced, sudden large-area weighting is prevented, and the safety is guaranteed; and the roof coal is effectively pre-cracked, the coal caving is smooth, and the roof coal recovery rate is high. The method provides a new technical means for the hard roof (coal) mining, and has the advantages of simplicity, convenience in construction, safety and reliability, and good effect.

Description

technical field [0001] The invention relates to a device and method for caving or coal caving by ultrasonic excitation fracturing, in particular to a fracturing method suitable for roof or top coal with high hardness, high strength and good integrity. Background technique [0002] In many mining areas in my country (such as Yulin Shendong mining area, Datong mining area, etc.), there are hard roofs with high strength, large thickness, strong integrity, and no joints and fissures directly on the coal seam or on the thinner direct roof. The large-area overhang of the hard and thick roof behind the goaf of the working face will often cause high stress concentration in the stope. When the area of ​​the suspended roof above the goaf reaches a certain level, the high stress accumulated in the roof coal or rock body is released suddenly, and the accompanying dynamic effect seriously threatens the safe mining. Light ones cause damage to mining equipment, and severe ones cause casua...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21C37/20E21C41/18
CPCE21C37/20E21C41/18
Inventor 王旭锋文杰李晓辉王选琳李鹏曹文豪秦冬冬
Owner CHINA UNIV OF MINING & TECH
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