PROCEDURE FOR CALCULATING THE PARAMETERS OF A REVERSE ACTION HYDRAULIC HAMMER FOR ROCK DESTRUCTION
L. V. Gorodilov1,2
1Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
2Siberian State University of Water Transport, Novosibirsk, Russia
Keywords: Hydraulic hammer, pre-impact speed, impact frequency, constant pressure
Abstract
A procedure for calculating the parameters of a reverse action hydraulic hammer (with an elastic constraint between the striker and the frame) is proposed, which can be used at the stage of its preliminary design. The method is based on the assumption of a constant pressure in the system and linear nature of the constraint between the striker and the frame. This allows obtaining formulas for calculating the dynamics and characteristics of the system using the equations of oscillation theory. Since the problem is iterative in the case of interaction between the striker and outside environment with a non-zero recovery coefficient, recursion is used in the algorithm for calculating the output characteristics of limit cycles. A program is developed and test calculations are performed. The results are compared with similar results obtained using a software for calculating the parameters of hydraulic impact devices based on a system model with a constant flow source. Satisfactory convergence of these results is noted.
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