METHOD FOR DETERMINING OPERATING PARAMETERS AT QUASI-LINEAR LAW OF THEIR CHANGE IN BAND-AND-SHOE BRAKES OF BORING WINCHES

摘要

FIELD: machine building.;SUBSTANCE: at quasi-linear law of change of rotation frequency of a brake pulley from the steady-state value to zero at startup of a loaded elevator the operating parameters of a band-and-shoe brake, which are included in the first group, are determined in the following sequence: the brake pulley rotation mode is evaluated; then, braking time, tension of a tight strand of a brake band, maximum and minimum specific loads in friction pairs, a brake moment developed by friction assemblies are determined; besides, brake moment reserve coefficient, power consumption of friction assemblies, forces applied by a drill man to a brake control lever, and efficiency coefficient of the brake are determined. Then, subsequent determination of operating parameters included in the second, the third and the fourth groups relative to a band-and-shoe brake of the boring winch takes place.;EFFECT: possible determination of operating parameters at quasi-linear law of their change in band-and-shoe brakes with interconnected power, thermal and wear-friction properties of their friction pairs and limiting allowable restrictions of speed, dynamic and thermal modes, which provide serviceable state of a boring winch brake system.;4 cl, 34 dwg