Structural Design And Experimental Research Of Electromechanical Brake Based On Mine Hoist

Mine hoist is an important equipment to realize coal mine mechanization,automation and intelligence.The braking performance of its braking system will directly affect the normal operation of coal mine production.At present,the hydraulic braking system has many hydraulic oil circuits,complex structure and high maintenance cost.In order to simplify the structure of the hoist braking system and reduce the use cost,based on the kinematics theory of the mine hoist braking system and the braking principle of the hydraulic disc brake,this paper puts forward the electro-mechanical braking method,and carries out the structural design,multi-objective optimization The main contents of fatigue life and dynamic simulation analysis,control system construction and experimental research are as follows:(1)Based on the kinematics theory and braking principle of mine hoist system,a design scheme of electromechanical brake suitable for mine hoist is proposed.Through the improvement of the existing disc brake structure,the structural design of "motor-speed reduction and torque increase device-motion reversing-Braking tread" is completed.The indirect braking mode of compressing butterfly spring by motor-driven transmission mechanism is adopted,The conversion of electro-mechanical brake from active braking to passive braking is realized.Through the theoretical calculation of scale experiment,the structural design and parts selection of "motor-speed reduction and torque increase device-motion reversing-Brake tread" are completed.Finally,the overall structure of the electromechanical brake prototype and the dynamic and static test-bed is obtained.(2)The finite element analysis model of the key stressed component shell is established,and the strength,stiffness and vibration characteristic curve are checked;By using multi-objective optimization design method,the mathematical model of shell structure optimization is established,and the modal harmonic response and fatigue life of the optimized shell structure and dish-shaped spring are analyzed,which verify the rationality of brake shell structure design.Finally,the machining of the shell is completed.(3)Based on the multi-body dynamics theory,the dynamic mathematical model is established,and the rigid flexible coupling dynamic simulation model of electromechanical brake is established by using the software Adams and Ansys.Combined with the provisions of coal mine safety regulations,The response performance of brake is analyzed by using control variable method,And the influence of positive braking pressure,initial braking speed,friction coefficient between brake disc and brake shoe on braking performance.(4)Based on PLC,the output voltage,motor forward and reverse control program and data acquisition program are designed by using programmable DC power supply,data acquisition and other equipment.The real object and dynamic and static test-bed of the electromechanical brake prototype are built,the dynamic and static test research of the electromechanical brake is carried out,the response performance and disc spring pressure characteristics of the brake are tested,the relationship between the braking positive pressure and the input voltage and locked rotor displacement is analyzed,and the influence of speed and braking positive pressure on braking performance is studiedFigure [70] Table [17] Reference [84]...