| The mine hoist is an important transportation equipment connecting the underground and the underground.During normal operation,the hydraulic station realizes the opening and braking of the hoist by controlling the oil pressure of the disc brake.When there is an emergency,the hoist is safely braked,and the torque is now constant.The secondary safety brake no longer meets the braking performance requirements.The use of a constant deceleration hydraulic station to safely brake the hoist can improve the stability of the braking process and reduce the impact of hydraulic circuit oil pressure.Aiming at the shortcomings of the existing constant deceleration hydraulic station design,a multi-channel constant deceleration hydraulic brake system is designed in combination with coal mine safety regulations and hydraulic station industry standards.The series pressure regulating design of the double proportional relief valve of the working circuit ensures the reliability of the working brake.When the hoist performs constant deceleration safety braking,if the constant deceleration fails,the failure circuit can be cut off in time.After the system switches the standby constant deceleration channel,the constant deceleration safe braking can continue,and the braking is more reliable.The various links of the constant deceleration braking system model are analyzed and the system mathematical model is established.The hoist speed curve is obtained from the constant deceleration closed-loop control system built in AMESim,and the mathematical model is identified by the Matlab model identification toolbox to obtain the hoist Constant deceleration safe braking process transfer function.Use Simulink to build an ADRC controller to control the constant deceleration process,and the parameters that need to be adjusted by the ADRC controller are tuned using differential evolution algorithm.According to the simulation results,the ADRC controller has a good control effect on the constant deceleration control.A constant deceleration hydraulic braking system based on Simulink and AMESim was built.The stability of the constant deceleration safe braking process and the constant deceleration switching constant deceleration process were studied through joint simulation,and the multi-channel constant deceleration hydraulic braking system was verified.reliability.The hoist speed monitoring and hydraulic station pressure monitoring are respectively used as the criteria for judging the safety brake failure of constant deceleration.The oil pressure fluctuation of the system during the process of switching the standby constant deceleration circuit is compared and analyzed,and the multiple criteria for judging the failure of the constant deceleration and the standby constant deceleration are established.The data collected at the constant deceleration field of the hoist and the simulation result data are compared,and the causes of the fluctuation of the system oil pressure and the hoist speed in the actual constant deceleration braking process are analyzed.The paper has 53 pictures,12 tables,and 82 references. |
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