... bridge ,and others 2,durable 3Double drum HJB Double Drum Mortar Mixer 1it is widely used in construction ,road,bridge ,and other ... ,durable 3Double drumApplication :HJB Double Drum Mortar Mixer is main auxiliary equipment of Mortar pump ,it is of double drum ,the upper churn ... mortar ,the lower store the mortar .It is ideal equipment widely used ...