| Mine hoist braking system is the security link of mine hoist system, which has great significance on productivity and work performance of mine hoist. Mine hoist braking system consists of two parts, the hydraulic station and the brake whose performance directly affects the stability and security of the hoisting system. The key of the study on braking system is dynamics simulation and analysis in emergency braking state.This paper introduced the structure and working principle of hydraulic station and brakes briefly. And then calculated the relevant important parameters, summarized the evaluation requirements and affect factors for braking performance of hoist braking.According to the its working principle, we built the hydraulic system model and did simulation in AMESim software environment. In emergency braking process, put different accumulators’ spring stiffness, air content, hydraulic pipe length and diameter, the electromagnetic directional valve’s port flow crosssectional area and the natural frequency as the control variables, then got the curve of brake oil pressure, positive brake pressure, brake shoe clearance respectively, and compared the effects of different variables above on hoist braking performance.Built 3D models of hoist disc brake and the spindle apparatus with UG and import the models into ADAMS, then set the appropriate constraints and parameters. At the same time, import 3D models of two brake discs and brake shoe into ANSYS to do the freedom modal analysis and generate modal neutral file, and then import the file into ADAMS to replaces the original rigid body with flexible body. After that, we can complete the establishment of the braking system’s flexible multi-body dynamics model in ADAMS.Co-simulation of the emergency braking process has been finished with the models of hydraulic systems simulation model in AMESim and flexible multibody dynamics simulation model in ADAMS. put different accumulators’ spring stiffness, air content, hydraulic pipe length and diameter, the electromagnetic directional valve’s port flow cross-sectional area and the natural frequency as the control variables, then got the time history curve of spindle’s angular velocity, angular deceleration velocity and shaft radial vibration acceleration, and compared the effects of different variables above on spindle apparatus’ s operating state in emergency braking process.This paper introduced related equipment of hoist test platform briefly and analyze the advantages and disadvantages of the protection device. In order to analyze the impact of brake pressure, brake shoe clearance and spindle vibration in emergency braking process, test project and procedures have been determined, and then compared data analysis results with the one of simulation to verify the correctness of the model. |
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