Taiyuan Research Institute Company Limited, China Coal Technology and Engineering Group Shenmu
Zhangjiamao Mining Company Limited, Shaanxi Coal and Chemical Industrial Group

According to the dificult start, unbalanced multi motor driving power and other problems existed in a driving system of the scraper conveyor, a soft start system with a valve controlled flling type hydraulic coupling was researched and developed. The paper introduced the composition, working principle and key technolog y of the soft start system with the valve controlled flling type hydraulic coupling. A flow field simulation technology was applied to the design of the impeller chamber mo de, structure and strength and a high strength copper alloy impeller was successully researched and developed. Based on a magnetic suspension technology, a floatin g support structure of the pump wheel component and a worm wheel support structure were designed and a reliability of the matching electric motor and the speed redu cerDs bearing was improved. A scale inhibiter was set up in a water supply circulated loop to eliminate a coupling operation fault caused by the water scale and to impr ove the reliability of the coupling operation. With a design on a supply water sealing, an overilling phenomenon occurred in the operation process of the coupling was C ompletely eliminated. A segmented vertical type combined control valve and water supply system could be applied to realize a selection of an open or close operation fo r the coupling. The reliable performances of the coupling were approved by the lab experiment and industrial experiment.

山西省科技攻关资助项目(20090321006)；山西省自然科学基金资助项目(2010011036-3)；太原市科技明星专项资助项目(09121017)；