Research Of The Lightweight Method On Overhead Crane Trolley

Under the condition of the modernized production, overhead crane has become the special equipment from auxiliary equipment in the continuous production process. As material handling equipment, overhead crane plays a crucial role in mechanical processing, chemical industry, electric power, energy, railway, transport, storage, metallurgy, mining and so on. But at present the weight and the energy consumption of overhead crane is large, the production cost and operation cost is higher. The purpose of the paper is to study the lightweight of overhead crane trolley to decrease the overall dimension, weight and wheel pressure of the trolley, increase the working space of the crane and reduce the cost of building. The paper main jobs are as follows:(1) Research on the scheme optimization of the trolley. The scheme optimization of the trolly is actually the scheme optimization of hoisting mechanism. The paper utilizes the fuction analysis method and analytic hierarchy process to analyse the scheme of hoisting mechanism from the quantitative and qualitative aspects, and get the optimal scheme.(2) Research on the lightweight method of drum. Over the years, the thickness of the welded drum is determined by the empirical formula, that the thickness of drum is equal to the diameter of the wire rope, then checking the strength and stability of the drum. This method is simple and practical, and the safety of the drum is high, but the thickness of drum tends to conservative, the bearing capacity of the material has not been fully utilized. The paper analyses the single coiling drum from the characteristics of the working load and the diameter optimization of wire rope, finally gives the relationship between the thickness of drum and the diameter of wire rope.(3) Predict the weld fatigue life of trolley frame on the basis of the equivalent structure stress method. Utilizing the equivalent structure stress method to analyse the weld of the lightweight trolley frame, analyzing the typical working load of trolley, establishing the finite element model of trolley frame including weld, through the post-processing, obtaining the structural stress of the corresponding place, applying the fracture mechanics to determine the related stress parameters of the weld fatigue, finally using the transformation equation of equivalent stress to process the data, and completing the weld fatigue life prediction of trolley frame.