Study On The Mechanical Analysis Of The Extendible Beam Of Airborne Roofbolter And Its Construction Technology

It is normally in china to use cantilever type roadheader and monoblock rock bolt drilling machine to drive roadways in coal seam, which is also called fully mechanized driving method. With this driving method, the coal cutting of the driving machine and the supporting of the roadway are separated, the supporting of the roadway occupys a long time that the operating rate of the driving machine and the driving velocity is influenced. In order to fully develop the function of the driving machine and realize high efficient driving of coal roadway, it is essential to study the airborne roofbolter with the coorperation of cantilever type roadheader. It has significance on improving the coal roadway mechanical driving level, realizing the the intergration of driving and bolting and mitigrating the passive situation of tensioned mining and driving subsequence.In this paper, based on the structure characteristics of EBJ-120TP type cantilever type roadheader, and combining with the geological condition of Meihuajing Coal Mine in Ningdong coal field, with the comparative analysis of several installation solutions of airborne roofbolter, the airborne single arm hydraulic roofbolter installation method is determined finally. This method is flexible and reliable with high adaptability, which can satisfy the requirement of all kinds of roadway profile. Meanwhile, in order to make sure that the extendible beam of airborne roofbolter can be used normally in the coal mine, the mechanical calculation and ANSYS finite element numerical simulation methods are applied to study the extendible beam theoretically.The study shows that, the maximum bending moment is located in the middle part of the extendible beam, and its value has relation with the support point. The lenghth of the inner beam has first power relation with the strength of the extendible beam, and third power relation with stiffness. So, the lenghth of the inner beam should be determined with the considerasion of the stiffness condition, and then determine the suitable position of the support point of the extendible beam. The numerical simulation results show that, the middle support position of the extendible beam will generate stress concentrate, it will break at this point firtly, and it is the key part of the extendible beam. What's more, the stress at the connection part of the inner and outer beam is smallest, so the support point of the extendible beam should be at the this area, which can fully develop the load-bearing role furtherestly.Finally, the main influence factors in the process of quick driving of coal roadway and the rock bolt support construction technology are studied, which can promote the support velocity of the of airborne single arm roofbolter, and realize the aim of quick driving.