| In winter the outside temperature is -15℃~-30℃, the wet coal freezes seriously in transportation. The frozen coal thick is about 400mm, sometimes freezes to a whole one, the unloading work is extremely difficult, affects the turnover of coal train, possessing rail cars and the railway, makes the railway transport strength not be fully displayed. It has created national manpower, financial resource loss, but in domestic and foreign, the development of movable frozen coal unloader is the blank. So develops one kind of this unloader is urgent.This article studys the frozen coal microscopic adhesive structure, pointed out the intensity of frozen coal is the synthesis of chemical bond strength, intermolecular action, hydrogen bond strength, electrostatic force and friction force, because the coal freeze situation differents, effect of different factors are also different. Ordinary,the ice layer is the frozen coal structure weak link, when the external force achieved ice layer's intensity, the frozen coal cracks. The frozen coal destruction is the tension stress destroys, and establish the frozen coal cutting model in this foundation, obtains the cutting force, feeding force, tooth spacing according to the smallest energy principle. Bring forward a rotary drilling mothod to unload the frozen coal, the broken ability is strong,without frozen depth limits, then obtains this machine working parameters, has combined this method with a grab and determined the plane of vehicle-carried rotary drilling movable coal-unloader.Using finite element analysis software carry on the stress analysis to the key component, to instruct structural design; made the strict processing and the heat treatment to the feather key, to guarantee feather key stress and the movement request; Has made the strict design of lubrication and the seal to improvement feather key working condition. According to the parameter we carries on the structure, the hydraulic system design and the blueprint, making this machine realize rotary drilling movements, break the frozen coal and unload the frozen coal to the outside of rail car; Carries on the processing, the assembly and the debugging of this machine. achieve the design goal through the approval. Keywords coal unloader, rotary drill, frozen coal, frozen adhesive, finite element... |
