Abstract
The aim of this paper is to develop a software which allows to determine the run-down of the rope in boom systems of portal cranes instead of the existing graph analytic methods in order to profile the crane trunk to ensure the movement of the cargo only along the horizontal path when the boom system departure changes. The universal analytical dependencies to determine the rope run-down were obtained, lines of equal run-down of the rope for hinged boom systems were stated. Due to the results of the calculations which were carried out with the help of the developed software, it became possible to obtain nomograms that allow designers to determine the necessary parameters of the boom system taking into account the rope run-down.
Highlights
The main feature of portal cranes is the design of boom devices, which ideally should allow the cargo to move along the horizontal trajectory, ensuring that its potential energy remains unchanged
The analysis of the existing calculation methods of hinged boom systems with a profiled trunk shows, that the proposed methods are based on graph analytic constructions which are labour-intensive and require repeated selection of parameters and their further verification, that is not useful for the development of automated design systems of portal crane elements [1,2,3]
Analytical dependencies are obtained for the determination of the rope run-down value in hinged boom systems of portal cranes
Summary
The main feature of portal cranes is the design of boom devices, which ideally should allow the cargo to move along the horizontal trajectory, ensuring that its potential energy remains unchanged. According to the scheme it can be stated, that the length of the rope branch at maximum run-down Lk is larger than the rope branch Lk at the final run-down, the value of the rope run-down (lowering) at the final position Ukan can be determined according to the following dependence: Ukan = Lk − Lk. The calculations performed for an existing crane, in which the boom and trunk are to be replaced, showed, that the lift value (sample) of the rope Uob taking into account the multiplicity of the polispast does not exceed the recommended [1,2,3] 0,2H.
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