... in construction ,road,bridge ,and others 2,durable 3Double drum HJB Double Drum Mortar Mixer 1it is widely used in construction ,road ... ,and other work place .2,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 ...