Abstract
Safety couplings, also called overload couplings, are used to mechanically protect the drive systems of machines – especially mining machines – against sudden overloads. Among these, couplings with shear pins are characterized by the simplest structure. The material and the diameter of the pin is selected by the designer based on the threshold moment at which the shearing should occur. The paper presents a theoretical method of selecting protective pins for specified threshold moment values for a selected Dodge®Raptor series coupling that shall find its application in the drives of mining machines (such as conveyors, crushers, pumps, etc.). Subsequently, a verification of the calculations has been performed by means of an experiment conducted on a special stand. Notable discrepancies between the results of calculations and experiments have been noted. The authors have attempted to explain that fact by testing the hardness of the pins in two planes. Incorrectly performed heat treatment of two batches of pins provided for testing has been discovered.
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