Main construction features: High strength due to one piece casting by using top quality materials for machine body. Smooth running, big pressure and low noise are obviously remarked as 3 to 4-step helical gear mechanism is adopted. Single plate electromagnetic clutch is sensitive reliable. Operational altitude is reasonably arranged , moving-bed opens to its optimum. Electrical system is designed in conformity with IEC standard. Single , continuous operation and opening dwell. Time lag range is adjustable. Safety protection system is reliable ( 3 safty) Lubricating system is advanced designed .