Load measurement method of vertical shaft construction hoisting system based on torque current

At present, load measurement method of mine hoisting system is mainly to measure load by adding a weighing sensor at the bottom of the shaft, but this method cannot be applied to vertical shaft construction hoisting system.The method of measuring hoisting load by analyzing functional relationship between wire rope tension and load has realized dynamic measurement of load. However, it is difficult to solve measurement accuracy problem caused by sensor installation and plastic deformation of wire rope itself, which brings hidden danger of safety. To solve the above problems, in view of situation that electric drive system of hoisting system is AC/AC inverter vector control of asynchronous motor, a hoisting load measurement method based on torque current was proposed according to torque current can be directly output by inverter. By establishing mathematical model and dynamic analysis of hoisting system, correlation between torque current and hoisting load is determined; on the basis, particle swarm optimization-least squares support vector machine was introduced to establish relationship model between torque current and hoisting load at three running stages of acceleration, uniform speed and deceleration;different disturbances are applied to the load at each running stage, and the relationship between hoisting load and torque current is analyzed by Matlab simulation. The simulation results show that there is a correspondence between hoisting load and torque current at each running stage, the torque current can accurately restore the hoisting load and its fluctuation.