HEADING MACHINE Russian patent published in 2008 - IPC E21C27/24 

FIELD: engines and pumps.

SUBSTANCE: heading machine contains a frame supporting the running gear, an actuator reduction gear. A rotary actuator is fitted on the output shafts of the said reduction gear and consists of a cross-piece with four beams provided with loading scoops, the supplied loading ladles, a borer and starting borer, an electric equipment and hydraulic system. A space with volume not less than that of the bucket is arranged inside every rotary actuator cross-piece beam. All the said spaces communicate, via inlets and outlets, by means of a system of pipes, the inlets and outlets incorporating shut-off valves. The spaces of two adjacent cross-piece beams are filled with high-density a liquid. Note also, that an independent pump with a position pickup is built in the space of every beam, the said pickup being coupled with the cross-piece beam inlet and outlet shut-off valves.

EFFECT: automatic balancing of the rotary actuator cross-piece and ruling out its deviation from rectilinear movement.

5 dwg