FACILITY FOR FIELD TESTS OF ROCK Russian patent published in 2010 - IPC E21C39/00 G01N3/00 

FIELD: mining.

SUBSTANCE: facility consists of cylinder case, of puncheon with force indicator installed in case perpendicular to its axis, of hinged torque link, central hinge of which is connected to puncheon, of two sliders whereon two end hinges of torque link are arranged, of bar with two stops wherein between two slides are installed, of guide for displacement of bar and of spring loaded inertia load. The facility is equipped with three electro-magnets; the first electro-magnet is secured on the cylinder case. The first and the second electro-magnets are attached to the bar and are designed to interact with the inertia load. The latter is made out of electro-magnet material and is placed between the second and the third electro-magnets.

EFFECT: increased scope of information by alternating constant continuous affecting loads with not damped cyclic loads and with damped cyclic loads with beginning of oscillations of utmost or zero initial loads.

1 cl, 1 dwg