Analysis of possible performance increase of open-pit excavators by elimination of soil adhesion to excavator bucket

[摘要] Soil adhesion to open-pit excavator buckets significantly reduces their performance and affects friction force between soil and the bucket. Thermal and vibrothermal methods are the most efficient among all ways to reduce soil adhesion under subzero temperatures. Performance analysis of single-bucket open-pit excavators and soil frictional resistance inside the bucket was carried out. A coefficient of proportionality and superficial friction factor fsf account for shift characteristics when calculating friction force of soil to metal surface, while its magnitude consists of deformation and adhesion components and depends on the same parameters as shift resistance, which are as following: contact time t and pressure P, soil humidity W and dispersability D, temperature T in shear plane, metal surface condition. By the experimental approach, on a special shift stand, the coefficient of proportionality magnitudes was calculated depending on temperature in a shear plane both without antiadhesion intensifiers and under thermal and thermoacoustic exposure. This will enable one to calculate friction force of the metal surface of working body taking into account adhesion and intensifier effect and using resulting data to choose an intensifier type.

[发布机构] Bratsk State University, Makarenko St. 40, Bratsk; 665709, Russia^1

[效力级别] 电工学

[关键词] Dispersability;Experimental approaches;Friction factors;Frictional resistance;Metal surfaces;Performance analysis;Sub-zero temperatures;Thermoacoustic