Jaw crusher upgrading at a primary crushing site of an underground mine at Gaisky GOK

Currently, mining enterprises, including non-ferrous and ferrous metal ores, pay great attention to the reengineering of existing equipment, introduction of new advanced technologies, full automation of process control using high-performance computer systems, improvement of labor organization and the professional development of working personnel. The issues of modernization of Nordberg C150 jaw crusher at the primary crushing site of the underground mine of PJSC Gaisky GOK in order to reduce the cost of its repair and maintenance were considered. The operation of the jaw crusher is characterized by a cyclic mode, which leads to an uneven load on the electric motors and their failure. In addition, the V-belt drive and friction clutches are subject to increased wear, which reduces overall production efficiency. To improve the reliability of the crushing plant, it is proposed to replace the old drive, including an electric motor, a friction clutch and a V-belt drive, with a new drive composed of gear motor and a gear clutch. The kinematic scheme and design of the upgraded jaw crusher are developed, and the type of gear motor and gear clutch is selected. The volume and design of a hydraulic concentrate tank made of sheet steel by welding are determined. As a result of the modernization of the jaw crusher drive, it is possible to simplify its design and reduce the complexity of maintenance and repair by 20 hours per year. Replacing the old drive with a new drive allows increasing the maintenance period and thereby reducing the operating costs. The calculations show that the implementation of the design solutions leads to a decrease in the cost of one ton of extracted ore by 0.12%, to an increase in the profitability of production by 0.67% and to an increase in the profit from sales by 0.80%. Additional capital expenditures are not higher than 2.8 million rubles and are paid off in less than 3 years.