Research On Dynamic Characteristics Of Belt Conveyor Based On Hydraulic Drive Technology

As the most ideal modern bulk material transport equipment, belt conveyor has been widely applied to electric power, metallurgy, chemical, coal, mining, ports, and food and many other departments. The continuous conveyor has the characteristic of long distance, large capacity, reliable operation, high efficiency and automation. As the continuous development of science and technology and industrial demand, the belt conveyor is developing towards long distance, high speed, heavy load and high power. The dynamic characteristics of the large belt conveyor shown in the unsteady running condition (starting, braking), makes the traditional static design method fail to meet the request of the conveyor on the working performance and reliability. It is necessary to study on the dynamic characteristics of large belt conveyor. Based on quickly achieving the purpose of the modeling and simulation by AMESim software, analyzing and optimizing of the design of the conveyor can reduce exploit cost and shorten the cycle.At first, the dynamic frame structure model of conveyor was established. The vogit model was adopted to establish the kinetic equation of discrete model of conveyor belt based on the finite element analysis method. At the same time, the kinetic equation of driving system, tension system, direction changing system and braking system in the same way was built. The dynamic simulation model of the belt conveyor was set up in AMESim, and the relevant simulation parameters of conveyor were determined according to the engineering example.This paper mainly analyzed the dynamic characteristics of the conveyor controllable hydraulic drive system. Under the starting and braking condition, the principle of conveyor hydraulic drive system was analyzed briefly. The dynamic analysis verified the validity of the mathematical model and the AMESim simulation model of constant pressure variable piston pump system. Under the premise of the mathematical model of valve-controlled motor system, the pressure pulsation in the process of starting and braking based on AMESim was analyzed and buffer device was added on the system for optimization. The effect on pressure pulsation is analyzed when different reasonable parameters of the buffer device are adapted. And the best result is obtained that the accumulator volume islOLand the charge pressure is 110 bar. Using the AMESim simulation platform to build the simulation model of conveyor hydraulic drive system, the PID controller of hydraulic drive system dynamic models was simulated, and optimization experiments of the hydraulic system was conducted based on genetic algorithm. Verified by simulation test, the three indicators, stability, accuracy and rapidity, of the hydraulic drive system based on genetic algorithm has been improved.Completely setting up the mechanical electronic hydraulic integrated systematic dynamics simulation model of belt conveyor, the different dynamic characteristic of the starting and braking curve is compared and analyzed. According to the variation of belt tension, speed and acceleration, finally the conclusion is reached that Harrison starting acceleration curve and corresponding Harrison braking curve is the optimal starting and braking curve.