Design and Test of a Flow Valve Orifice in a Crane Hoisting System

A combined orifice is designed for the flow valve in a crane hoisting system. The structure and parameters of the combined orifice are calculated and designed according to analysis of the characteristics of the commonly used single orifice and considering the requirements of the crane hoisting system. The equivalent flow area and computational fluid dynamics are adopted in simulating the flow area and pressure loss of the combined orifice. A model of the crane hoisting system is established in AMESim software and the control performance of the combined orifice on the hoisting speed is simulated and analyzed. Simulation results show that the maximum equivalent flow area of the combined orifice is 213 mm2, the pressure loss is 1.28 MPa when the throttle opening is a maximum at the rated flow rate and the maximum hoisting speed is 150 m/min for no load and 110 m/min for a heavy load. A speed regulation performance test of the crane hoisting system shows that the maximum hoisting speed is 150 m/min for no load and 112 m/min for a heavy load and the minimum stable speed of hoisting system is less than 1.83 m/min under different working conditions.