... 1. Simple structure 2. national patent 3. smooth operation rotary screener / material Product Introduction: Simple structure, smooth operation, ... is located in Zhangqiu an ancient city in Shandong Province, China . Zhangqiu Yulong Machinery Co., Ltd is hi- tech ... shredding, grinding two series; air flow drier and cooler , rotary drier two series; and conveyors, screeners other related equipments. ...