Research On Hydraulic-viscous Controlled Soft Start Technology For Mining Large Belt Conveyer

This thesis proves one new hydraulic-viscous controlled drive device on the base of analyzing ones for belt conveyers in home and abroad . This device , integrating mechanism ,electricity/electron and hydraumatic as a whole , has many characteristics , such as controlled start , controlled brake , overload protection , no-load start , power balance , testing belt speed and so on .This thesis introduces the mechanism principle of the device and makes mechanism movement simulation on the base of its parametrical model . It researches on the structure and work principle of hydraulic-viscous clutch , analyses hydraulic-viscous drive characteristics ,efficiency , heating and so on . According to request for controlled soft start device working performance , This thesis designs its hydraulic control system which includes clutch press control system ,cooling system and lubricating system . Taking a drive device which a large power belt conveyer requires into consideration , it shows out idea speed curve and acceleration one when the belt conveyer starts . In succession , it designs electrical control system for soft start device . Finally , in order to verify whether this designing theory is right , it assemblies modular which can run solely ,and makes many tests which approach actual work condition . Results of tests indicate this device can realize controlled soft start for belt conveyers , and it reaches to designing aim .This thesis mainly researches on following aspects: the structure , the working principle and the whole device parametrical model of soft start device for belt conveyer ; mechanism movement simulation; and properties of hydraulic-viscous friction drive . It also designs the hydraulic control systems and electrical control systems. This thesis proves that , soft start device, adjusting gaps among friction plates to precisely control multiple motors drive power balance and soft brake , can greatly reduce belt's dynamic tension , make conveyers start and brake more stationary, and reduce cost of devices greatly.