Research on Preventing Deflection Mechanism of the Auger Mining Machine

Abstract

Auger mining machine which is used in thin coal seam gets coal by drilling. Its drilling distance always is dozens of meters. Because of the long Drilling distance, the deflection of the drilling tool was produced by deviating force . In order to improve auger mining machine’s preventing deflection character and scope of application, the research on preventing deflection mechanism of auger mining machine combining theoretical analysis and experimental research was carried out on the basis of a simplified drilling tool structure. The studies we have performed showed that: increasing the drilling assembly bending rigidity or the drill pipe weight can prevent deflection; reducing the distance between the drilling stabilizer and drill is another method to reduce amount of deflection.

Research on vibration and deflection for drilling tools of coal auger

“…These literatures studied drilling tools' vibration effects of various parameters, including boundary condition, drilling load, structural parameter of drilling tools and so on, but it is scarcely reported on the whole body vibration and deflection of a coal auger drilling tools, which results that their vibration and deflection is not easy to effectively predict, then application and development of coal auger is hindered. In addition, there is currently no effective measure to control deflection [23][24][25][26][27], and research on stabilizers arrangement form only confines to theoretical analysis with little attention to corresponding simulation research. Aiming at this situation, the article firstly builds drilling test bench of a three-bit coal auger' drilling tools and conducts the experiment to study their vibration and deflection performance; it secondly establishes the rigid-flexible coupling simulation model of a three-bit coal auger' drilling tools and analyzes their vibration and deflection performance with different drilling depth; it finally designs a novel drill rod stabilizer, constructs simulation model of a three-bit coal auger with the stabilizer to study vibration and deflection performance for stabilizers' arrangement form, which provides scientific basis for effective control of drilling tools' vibration and deflection.…”