Design And Simulation Analysis On A Pawl Type Anti-running-Away Mine Car

Mine-car transportation is the important tool of coal mine transportation. Because of the factors bad work environment, big load, high using frequency, clearance between parts, which cause parts prone to failure at work and running-away accident. If this accident happened, it would have caused damaging equipment, interrupting transportation, serious economic losses and casualties. In order to improve the safety of transportation under the mine should be according to the characteristics of transportation under the mine designed a new type of device to protect mine car in running-away. Compared with the traditional protection device, the device should be nimble, short braking time and reliable, etc.The paper based on speed difference of two states that before and after running-away to set out three feasible devices and using the method of fuzzy comprehensive evaluation to evaluate the three kinds of devices’economy, labor protection, reliability and functional. Eventually determine the plan one for the optimal device. Then, Then, according to the actual size MGC3.3-9 type mine-car has carried on the design for plan one and to determine the dimensions of different parts.By using simulation software ANSYS Workbench, obtain the relationship between effective stress and the collision time dangerous parts when the collision of brake pawl and wood and use these relationships to braking pawl is optimized. By using simulation software ANSYS Workbench, obtain the relationship between the dangerous parts by static stress and the contact time, the deformation and contact time and use these curves and contours to braking mechanism is optimized.By using simulation software ADAMS, obtain the relationship between running-away time and wheel speed change, brake reset spring forced, speed sensors reset spring forced, braking pawl displacement and use these relationships to the device structure is verified and checking.Through the above simulation analysis, the result shows that mechanical braking equipment is a reasonable design and the braking time is less than 0.4s. It has the reset function after troubleshooting and real-time capture function. It is effective to protecting the mine-car in running-away accident and has great significance to improve the safety of the coal transportation.