Results of bench tests on the USD-2 dynamic plow

The productivity of coal-cutting machines can be increased and the quality indices of the cut coal improved by means of new, less energy-consuming methods of coal cutting. In certain conditions the percussive method of coal cutting satisfies these requirements. In this connection, increasing attention has recently been paid to finding or devising efficient designs for percussive effector units for dynamic plows. In the plans for attacking this problem, on the basis of combined investigations of cutting Karaganda coals by impulsive mechanical loads, the Giprouglegormash and Karaganda Polytechnic Institutes have together developed a design for an experimental dynamic plow, the USD-2, which was built by the Kargormash group. The USD-2 includes a cutting machine--the SD-1 dynamic plow with bilateral percussive effector unit--together with feed mechanism and face conveyer taken from the commercially produced USB-67 static plow. The USD-2 is intended for cutting coal from flat-lying seams 1.2 to 1.4 m thick with cutting resistances of up to 300 kgf/cm with individual or mechanized supports.