Mine roof bolter

摘要

A mine roof bolter is described which has a rotary drill head with: (1) sufficient rotative mass that breakage of bits and steel is minimized, (2) a dual drive assembly that provides balanced side thrusts against the bearings so that wear thereof is minimized, (3) a sealing assembly that protects the lubricating oil from contamination by dust and mud under very adverse conditions, (4) circulatory lubricating devices that provide oil to the sealing assembly and drive assembly, and (5) a dust collecting assembly which is suitable for fast and simple cleaning. The mine roof bolter additionally has a lift arm which is constructed with three parallelograms providing useful spatial advantages and a panic bar assembly which enables an operator to stop all hydraulic and electrical systems from two sides of the machine.