MULTI-LAYER ROLLING VIBRATION ISOLATION APPARATUS HAVING LEAD-ZINC DAMPING ROD

A multi-layer rolling vibration isolation apparatus provided with a lead-zinc damping rod applied to an LNG storage tank, the apparatus being characterized in that: an upper connecting cover plate and an upper rolling groove are connected by means of bolts; a lower connecting cover plate and a lower rolling groove are connected by means of bolts; a lower groove of the upper rolling groove corresponds to the position of an upper groove of a middle rolling groove; an upper groove of the lower rolling groove corresponds to the position of a lower groove of the middle rolling groove; and steel balls are placed in the upper and lower grooves respectively. The number of layers of the vibration isolation apparatus is limited so as to reach the maximum vibration isolation period, and the vibration isolation apparatus can achieve variable-rigidity rolling vibration isolation by means of increasing or decreasing the rolling grooves of the middle layer. Meanwhile, a lead-zinc damping rod is inserted in the middle of eac