Mechanical-impedance method in research on the interaction between a powerful activated plough and solid coal

Abstract

In connection with the construction of powerful activated ploughs with impact energies of 700-1000 kg 9 m [1-3], it is becoming important to investigate the optimum conditions of force interaction between the blade and the cut rock. It is known [4] that the effectiveness of the impact method of cutting largely depends on the duration of the rising front of the power pulse, its shape, and the physical properties of the cut medium. The aim ofthemethod suggested in this article is to estimate the elastic and viscous properties of the blade-medium system and to determine the parameters of the power pulse which will give the maximum breaking effect.In static breaking, which is realized in the case of a continuous power action, the loading characteristics for driving the blade into the coal can be fairly accurately approximated by a linear relation. With this characteristic, the resistive forces increase in proportion to the depth of penetration; the mechanical resistance is quasielastic and can be represented by a stiffness K [5] which is equal to the angular coefficient (slope) of the load characteristic.