COMPARATIVE ANALYSIS OF INFLUENCES OF MULTIWHEEL TRAVELLING CRANES OF NATIONAL AND FOREIGN PRODUCERS

The article is dedicated to the comparative analysis of foreign and national multiwheel overhead travelling cranes. Multiwheel travelling cranes are an essential part of any large production and are used to perform various kinds of handling of especially heavy loads. Therefore an installation of modern travelling cranes will improve economy of constructions of industrial buildings of heavy production. The industrial buildings in our country are often equipped with foreign crane equipment. Among foreign cranes travelling cranes of the group Demag were taken into consideration. Demag is one of the largest German companies that has sales offices in all continents. Different codes which govern the operation conditions of cranes were reviewed. Geometrical parameters of cranes were analyzed in details. Load and weight characteristics of overhead cranes were compared. The comparison of characteristics of multiwheel travelling cranes by GOST 6711-81 [14] with Demag cranes ZKKE with two bridges was done. The cranes with carrying capacity of 80/20 ton with middle operation mode were taken to the review. Travelling cranes were compared by geometry, weight and power parameters. By comparing the geometric characteristics, it was found that Demag cranes are more compact. Smaller dimensions entail reducing of weight of the foreign cranes. The weight of the bridges and crabs of cranes company Demag is smaller than weight of elements of cranes by GOST 6711-81. We can conclude that the designers of concern Demag managed to reduce weight and geometry of overhead cranes and thus reduce the loads on the construction of industrial buildings. Vertical and horizontal loads per wheel were calculated. Comparison of this loads showed that the load per wheel of Demag cranes are less then loads from influences of national travelling cranes. To calculate the loads on the lateral frame of industrial building, travelling cranes were placed in the most unfavorable manner. Vertical and horizontal loads which appear in the left column of the lateral frame from two adjacent cranes were estimated. To get maximum loadings in the crane girders the most unfavorable variants of bridge cranes location on girders were identified. According to these schemes the maximum values of bending moments and transverse forces were obtained. With the values of these eternal forces the crane girders with the span of 6 m and 12 m were designed. The comparison of the cross-sections of crane girders showed that with the use of overhead cranes of concern Demag possible to achieve savings of materials of crane girders. Comparison of loadings of multiwheel overhead cranes on constructions of one story industrial buildings was done. Analysis of strength and weight parameters of national cranes by GOST 6711-81 and foreign overhead cranes Demag showed high adaptability and benefits of foreign light cranes. The use of crane equipment of Demag group will reduce the cost of structures of industrial buildings with multiwheel overhead travelling cranes.