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根据89年国家级新产品试创(鉴定)计划编号(65—985—370200—0)和机电部89年机械工业科技术发展计划(89146002),由天津大学和青岛第四铸造机械厂共同研制开发的S1420转子混砂机于1989年12月1日在山东省平度市青岛第四铸造机械厂通过部级鉴定。该机的混砂机构是很据自行探索的冲击一剪切原理设计的,用中速转动的转子和低速转
According to the 1989 National New Product Trial Creation (Appraisal) Plan No. (65-985-370200-0) and the Electrical and Mechanical Department 89 Machinery Industry Technology Development Plan (89146002), jointly developed by Tianjin University and Qingdao No.4 Foundry Machinery Factory Developed S1420 rotor mixer in December 1, 1989 in Pingdu City, Shandong Province, the fourth-casting Machinery Factory passed the ministerial level appraisal. The machine’s sand mixing mechanism is designed according to the principle of impact-cutting explored by oneself. The rotor with medium speed rotation and the low speed rotation