Hydraulic punching, dredging and slag discharge integrated device and method

Abstract

Disclosed is a hydraulic punching, dredging and slag discharge integrated device. The hydraulic punching, dredging and slag discharge integrated device is simple in structure, controls movement of a valve core by regulating hydraulic pressure, changes opening and closing of a punching drill and high pressure water streams in a nozzle through the movement of the valve core, and thereby can change flow directions of the high pressure water steams according to functions of different water pressures, is convenient to operate, and can effectively prevent phenomena of hole blocking and drill jamming, and can prevent hole spraying, drill jacking, gas overrunning and the like from occurring during the hydraulic punching process. A method of the hydraulic punching, dredging and slag discharge integrate device is simple in technology and convenient to implement, can achieve integrated operation of coal body hydraulic punching and dredging slag discharge, generates high pressure water jets which can directly act on coal slime and coal cinder around a drill rod and the punching drill through a dredging slag discharge drill installed at the rear of the punching drill, discharges slag from outside to inside, can prevent the hole blocking and the drill jamming, prevents accidents of the hole spraying, the drill jacking, the gas overrunning and the like from occurring during the hydraulic punching process. During the use process of the hydraulic punching, dredging and slag discharge integrated device, the dredging slag discharge drill can automatically change directions of the water streams by adjusting the water pressures, and a dismantling operation device is not needed during the whole process of drilling, punching and dredging.

Description

technical field [0001] The invention belongs to the technical field of coal mine gas drainage equipment and methods, and in particular relates to a hydraulic punching, dredging and slag discharge integrated device and method suitable for soft coal seams. Background technique [0002] As a process for strengthening gas drainage, hydraulic punching has been widely promoted and applied due to the advantages of simple system equipment and process. [0003] However, when hydraulic punching is applied in soft coal seams, with the continuous progress of hydraulic punching, the deformation of the newly exposed coal body is difficult to fully develop, resulting in the continuous increase of stress gradient, and the gradual accumulation of strain energy and elastic potential, making the coal body With the conditions of sudden failure, the coal body is in an unstable strain softening stage, and failure and collapse occur under the action of stress. While water is discharging slag, it ...

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Problems solved by technology

[0004] In order to avoid the phenomenon of hole blocking, drilling, injection hole, top drilling and gas overrun, the patent No. CN201010512993.2 discloses "a method and device for drilling deep and long gas drainage holes in soft coal seams along the bedding". , this method drills holes in the hard stratification and relieves the pressure on the soft stratification, thereby ensuring the integrity of the drilling and can prevent the borehole from collapsing and holding the drill; however, this method cannot be applied to those without Hard stratified coal seam, more limited

In addition, the patent No. CN201210173486.X discloses a "multi-stage hydraulic punching drill", which is provided with at least two symmetrical jet nozzles on the jet drill installed on the frontmost side of the drill rod to clean the surrounding holes of the drill when punching. Cinder; however, due to the opposite direction of the slag removal water flow and the return water speed, the spray distance is greatly limited, and a certain amount of water needs to be separated for slag removal during the punching process, which reduces the punching energy; in addition If there are phenomena such as hole blocking and drilling during the punching process, the drill bit will inject water into the punching hole, the gas will be squeezed, and the pressure will increase.

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