Telescopic propelling frame for drilling machine

The utility model relates to a telescopic propelling frame for a drilling machine, which comprises an outer mast frame, an inner mast frame slidably connected in the outer mast frame through a slide rail roller component, a top pulley component mounted at the top end of the inner mast frame, a bottom roller component mounted at the bottom end of the inner mast frame, and a power head mounting plate component movably mounted on the inner mast frame. The upper part of the chain mounting plate is connected with one end of a lifting chain, and the other end of the lifting chain bypasses the top pulley assembly and is connected with the upper part of the power head mounting plate assembly. A sliding rail mechanism is formed by the inner mast and the outer mast, and large-stroke displacement which cannot be achieved by a common propelling frame is achieved. The inner mast and the outer mast are formed by welding rectangular pipes and reinforced I-shaped steel, a box type structure is formed, the strength is good, a