Simulation research on pressure shock of load sensing system of large boom tower crane

Abstract

Large boom tower cranes have large masses, heavy loads, and large inertial dynamic loads during the conversion of working conditions. Even if there is a buffer device, hydraulic shock will still occur. The problem of hydraulic shock seriously affects the leakage of hydraulic oil and decreases system reliability. Now the closed hydraulic system of a certain type of boom tower crane is taken as the research object, and the joint modeling of machinery and hydraulic is completed in AMESim. Without changing the basic hydraulic components, the hydraulic system of the whole machine just adjusts the ratio of the pulley block or changes the hydraulic speed regulation method to study the hydraulic shock of the servo-sensitive hydraulic system. AMESim simulation results show that in this load-sensitive system, the double-rate hoisting of the pulley block is compared with the single-rate hoisting of the pulley block, the maximum dynamic load generated by the load off the ground is increased by 5.4%; Speed regulation of the variable pump and variable motor combination is compared with the speed control of only variable motor, the maximum dynamic load of the hydraulic system is reduced by 7.6%.