engleski

Forces Required for Pulling Out a Winch Steel Cable and Physical Load of Choker-Man

The forces required for pulling out a winch steel cable are essential for evaluating the effect on physical load of choker man. The following parameters have the greatest impact on the size of these forces: diameter and unit weight of steel cable, resistance forces in the winch that occur due to friction in the drum bearings, improper adjustment of winch brake and clutch and also the terrain slope where the rope is pulled. This paper presents the results of in situ measurements: • pulling force of steel cable, • velocity of steel cable pulling, • power consumed in pulling, carried out on a Hittner 2 x 80 winch mounted on a skidder Ecotrac 120V. Changes of measurement values are analyzed as a function of: • length of the pulled steel cable, and • terrain slope (5 different inclinations ranging between -19 ˚ and +19 ˚). Based on the research results, physical load of choker-man is classified as work under heavy load according to the Directive 90/269/EEC, including the possibility of excessive work loading of healthy workers. During this evaluation, due to specific conditions in the forest, it has been observed that the assessment of physical load of choker-man is not satisfactory according to the applicable regulations.

steel cable; forest winch; choker man; pulling forces; physical load

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