The article discusses the topic of the specific power consumption of a drum mill type SAG 8.5x5.3. The purpose of the study is to determine the influence of some basic parameters like angular velocity of the mill drum, the wear on the drum’s lining, mass of the mill filling, loading rate of the mill with ore and flow rate of incoming water of the product to be milled on the relative power consumption of the mill for maintaining quality. To determine the energy consumption of the mill, the listed parameters were measured and a Fisher matrix was constructed. In accordance with the selected target function, energy consumption patterns are synthesised depending on the loading rate of the mill with ore, the mass of the mill filling,the flow rate of the incoming water and the wear on the drum’s lining. Data processing was performed using the STATGRAPHICS computer programme and an adequate model has been found according to the selected target function. The target function has been found to satisfy the conditions for maintaining quality and reducing costs.

No abstract

In the current development, the object is the icing of drums of belt conveyors that work in open mines located at high altitudes and in winter conditions. A literature review was made of publications related to the problems at low temperatures and the presence of moisture, including the icing of rollers and drums of belt conveyors. Conceptual options are suggested to prevent freezing and related accidents. The options are accompanied by short methods for determining the main technical parameters. Finally, the advantages and disadvantages of the described options are indicated and, in conclusion, the best among them for the specific working conditions. A stationary or a mobile heater is chosen as a better option.

Balancing the excavator structure is a widely considered topic that directly relies on the operation, the wear of nodes connecting the upper and the lower structures of the excavator and especially on the stability of the excavator at the operational site. The present paper considers the balance of the excavator structures of the SRs 2000 excavator with idealization to some static positions and simplification of the interactions to static ones. This allows positional regard of the most used positions under operating conditions. This approach derives some dependences clarifying the static balancing of the super structure of the excavator to the undercarriage, taking into account the interactions of both the weight parameters, as of the structural units, as of the main external forces. There are derived dependences for determining the load of ballast weights during repair and modernization of excavator structures