Analysis Of Thermal Coupling And Mechanism Vibration Of Safety Brake In Casting Crane

In metallurgical industry, casting crane is the essential equipment, and its task is very dangerous at the same time. Therefore, the braking system on the casting crane is particularly important. Especially, the fail-safe emergency braking is very vital to avoid accidents and casualties of the staff.For the fail-safe emergency braking of the casting crane, this topic uses the LS-DYNA software to make thermal coupling analysis of friction pair’s temperature field of the brake. Then, the impact of the vibration induced by the fail-safe emergency braking on the load chain of the casting crane is analyzed from the angle of vibration.The simulation results of friction pair’s thermal coupling analysis in temperature field show that the temperature distribution of ductile iron brake disc is better than the one of cast iron brake disc. In an emergency braking, if the braking energy is constant, then the braking safety factor is inversely proportional the braking time. The larger the braking safety factor, the shorter the braking time. Meanwhile, the rate of heat conversion is faster. Compared with the small braking safety factor, the temperature field distribution formed by the greater braking safety factor has the shortcomings that the surface temperature is higher and the radial temperature gradient is greater.The vibration analysis of the impact on the load chain, which is induced by the fail-safe emergency braking in mid-air, shows that the amplitude of the vibration caused by the emergency braking is 182 mm which is almost equal to the free space height of steel ladle 200 mm. So, the molten steel may spill out because of the vibration caused by emergency braking, which suggest that the free space height of the steel ladle should be larger, it is best to 300 mm. In this case, the dynamic tension generated in the winding rope of the hoisting mechanism is 16711 N, and the vibration impact factor of the hook caused by vibration of emergency braking is 1.013, which is smaller than the lifting dynamic load factor caused by vibration when lifting off the ground.