TY JOUR TI MATHEMATICAL DESCRIPTION OF STRESS-STRAIN CONDITION OF BALL MILL’S PIN UNDER THE FORCE OF GRAVITY AND ROTATION KW pin of ball mill KW depreciation of equipment KW the mathematical description of the stress-strain condition KW the bending of the rotating pin JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Bondarenko, Y.A. AU Hanin, S.. AU Bestuzheva, O.V. PY 2019 IS 4 PB Belgorod State Technological University named after V.G. Shukhov