Study of the dependence of efficiency on the load of a drilling machine

Abstract

The question of research of dependence of efficiency on loading of the drilling machine is considered. To achieve this goal in the work were set and solved the following tasks: - to analyze the design and technological features of the drilling machine part; - to develop a new design of a drilling machine with a network analyzer; - to investigate the new design of a drilling machine with a network analyzer. About 80 % of drilling machines at Ukrainian enterprises are operated in excess of the established shelf life, which leads to their low quality of operation, high accident rate and failure of electromechanical equipment. The average shelf life of the electric drive in the industry does not exceed 6 years. Up to 10–18 % of electric motors and up to 30 % of auxiliary equipment fail and are repaired annually. The vast majority of engines can be repaired 4-5 times and after repair often do not work even for one year. The operation of drilling machines with an induction motor (short-circuited rotor), which are in poor technical condition, leads to an increase in financial costs due to increased power consumption. The cost of electricity consumed by the electric drive of drilling machines during the service life is significantly higher than the cost of equipment and maintenance costs and more than 4 times higher than its own. The electricity bill includes a system of surcharges for additional reactive power consumption. Reactive power charges at enterprises account for up to 10% of total electricity costs, and these costs tend to increase. Today, there is a need to apply the latest technical solutions and scientific approaches to solving the problem of improving the quality of operation of asynchronous electric drives of drilling machines. A research stand has been developed to determine the asynchronous motor of a drilling machine, which allows to identify the dependence of efficiency on the magnitude of the load, calculate the parameters of the substitution scheme and energy characteristics for the nominal mode of operation of the electric drive. Key words: drilling machine, network analyzer, research stand