Abstract: Abstract:The structure of the ring type coal crusher was introduced. The outoflimit vibration of the ring type coal crusher bearing, which frequently occurred in operation of the coal crusher due to failure of the vibration damping platform, was expounded. The reasons of outoflimit vibration of the ring type coal crusher bearing were analyzed, and the method for preventing the outoflimit vibration was proposed.

Key words: Keywords:ring type coal crusher, vibration damping platform, reinforced concrete foundation, vibration