1. Shandong Vocational College of Science and Technology, Weifang, PR China
2. Associated Engineering Research Center of Mechanics and Mechatronic Equipment, Shandong University, Weihai, PR China
3. School of Machinery and Automation, Weifang University, Weifang, PR China
4. Sinosteel Zhengzhou Steel Wire Productis Research Institute Co, Ltd, Zhengzhou, PR China