Design And Research On Braking System Of Mine Unmanned Locomotive

With the rapid development of modern industrialization,coal mine transportation is developing towards intelligence and automation.Mine electric locomotives,which are used as the primary mode of transportation in the extraction of coal,were developed to increase the safety and effectiveness of transportation.For mining electric locomotives,the braking performance directly affects the safety of coal mine transportation.Therefore,it is vital to create a brake system that is straightforward to use,convenient to brake,and can realize automatic control for mining unmanned electric locomotives.First of all,theoretical analysis of the braking process,braking force,adhesion mechanism during wheel-rail contact,and factors affecting the adhesion coefficient are conducted in this thesis.Additionally,the 5t mining battery electric locomotive’s basic technical data are used to assess and compute the key braking system components.Lidar,infrared sensors and camera sensors are used to build an intelligent perception system and selection and arrangement it.,a brake control system based on fuzzy control algorithm is proposed.Secondly,to determine if the fuzzy control technique can be applied to provide quick and effective braking,the braking system’s mathematical model and simulation model are created in MATLAB/Simulink.The simulation shows that the application of the fuzzy control algorithm can realize the rapid response of braking.Its braking distance is less than 20 meters and much less than 40 meters,and the mining electric locomotive’s braking distance complies with coal mine safety norms.Finally,the ANSYS/Workbench disc brake simplified finite element model is established based on the movement characteristics of mine electric locomotive at low speed,overload,theoretical analysis of the friction theory and the theory of heat transfer.In the simulation process,adopt the method of direct coupling simulation calculation.The temperature field and stress field of the brake disc are examined during braking,and the simulation results demonstrate that the temperature rise rises in a zigzag pattern,is rapid in the early stage,tends to be stable in the later stage,and the maximum temperature rises during the later stage,the brake disc’s maximum temperature is substantially lower than150°C,it is significantly less than the maximum allowed stress of 250 MPa,which satisfies the strength requirements of the brake disc material,and which fulfills the maximum temperature requirements of the braking system of mining electric locomotives for the brake disc.The braking system based on fuzzy control algorithm studied in this thesis builds a simulation model of the motor vehicle simulating the underground environment,and the simulation test shows that the autonomous braking of the underground environment can be realized,and the braking control method has certain reference value.