Valve-Control Hydraulic Coupling Used In Belt Conveyor’s Start-Up Progress

Controllable starting technology of belt conveyor is the key technology of the development of modern belt conveyor. Valve-control coupling has a soft start with good performance, is the main way of belt conveyor soft start. Take research on valve-control coupling can solve the stability and precision problem in start-up progress.Analyze the characteristics of the conveyor belt, find that it needs times to spread speed, acceleration and tension in the conveyor belt, in a form of wave propagation. Therefore, the speed, acceleration and tension of the whole length of the conveyor belt is a function of time. Its impact on the low speed, short distance conveyor is not too big, but case on long distance and large capacity conveyor belt conveyor this dynamic phenomenon will be clearly demonstrated, especially in the starting and braking condition. These will reduce the fatigue life of the belt, the transmission device and other components. Consider these, the S type starting curve with the climbing segment can limit the peak dynamic tension to a safe range. The output of the speed is relatively stable, there is no instantaneous mutation.Hydraulic coupling belongs to the complex of the hydraulic transmission device, the study of the flow state can achieve the goal of high precision speed control. This paper analyzes the numerical calculation principle and gas-liquid two-phase, compression, three-dimensional unsteady turbulent flow in CFX. And then, present gas-liquid two-phase setting, boundary setting, dynamic coordinate system, the wall setting and the turbulence model.This paper calculate a □562 peach shaped chamber with aqueous media in different filling rate and different ratio.Comparing the pressure distribution of the flow field, the pressure of the blade surface and the velocity vector distribution in the middle section of the flow passage, come to the conclusion that internal flow field of hydraulic coupling is circulation flow, and with the increase of filling ratio, the output torque increases gradually. In addition, the prediction of the output torque is obtained by the numerical integration of the pressure on the blade.Valve-control hydraulic coupling is a typical mechanical electrical and hydraulic integration system, the charge discharge system is the key to control the filling rate changes. This paper established the simulation model of the valve in AMESim, analyzed hydraulic system pressure and flow rate requirements, and determine the charging valve, exhaust valve and a hydraulic circulating valve specifications.According to the inlet and exhaust liquid outlet structure as well as the body for the pilot solenoid control valve, liquid system model in AMESim environment was conducted to establish, in order to lay the foundation for the control of the whole system simulation. Control object contains valve and hydraulic coupler, due to the latter’s nonlinearity, parameter tuning fuzzy-PID controller was used to charge filling process, in order to realize the starting process of belt conveyor in parabola type. At last, we did a AMESim-Simulink simulation, which verify that the intelligent fuzzy-PID system has the advantages of stable, small error in automatic control system.