TECHNOLOGY OF CONSTRUCTION PROCEDURES. MECHANISMS AND EQUIPMENT

Analysis of the possible increase of the excavators productivityafter removing soil adhesion to the scoop

Vestnik MGSU 2/2014
  • Zen'kov Sergey Alekseevich - Bratsk State University (BrGU) Candidate of Technical Sciences, Associate Professor, Department of Construction and Road Building Machinery, Bratsk State University (BrGU), 40 Makarenko street, Bratsk, 665709, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Balakhonov Nikita Aleksandrovich - Bratsk State University (BrGU) Master Student, Department of Integrated Mechanization of Construction, Bratsk State University (BrGU), 40 Makarenko street, Bratsk, 665709, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Ignat'ev Kirill Andreevich - Bratsk State University (BrGU) postgraduate student, Department of Construction and Road Building Machinery, Bratsk State University (BrGU), 40 Makarenko street, Bratsk, 665709, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 98-104

In the process of developing wet cohesive soils (especially at cold temperatures) sticking and freezing of soil on the operating elements essentially reduces the machines performance. The performance decrease happens due to the reduction in the useful capacity of the scoops and due to incomplete unloading, the growth of frontal resistance at cutting (digging) as a result of wet ground sticking to a working part and also the resistance of the input into the scoop and increase of machine downtime due to the need to clean the operating elements. One of the most effective ways to reduce the adhesion of soils at the temperatures below zero is effecting with thermal and vibrothermal intensifiers.The article presents the analysis of shovels performance and soil frictional resistance inside the scoop. The proportionality coefficient or reduced friction coefficient takes into account the shift peculiarities when determining the soil friction force on metal surface, and its value includes deformation and adhesive components and depends on the same parameters as the shear resistance, namely, the time and the contact pressure, humidity and dispersity of soil, temperature in the shear plane, the surface state of the metal.Experimentally with the use of a special bench shift values the proportionality factor was determined depending on the temperature in the shear plane without affecting intensifiers, which reduce adhesion, and also at thermoacoustic and thermal impact. The results will allow calculating the frictional force on the metal surface of the operating element, taking into account adhesion and intensifiers effect. The obtained data will help to select the type of intensifier.

DOI: 10.22227/1997-0935.2014.2.98-104

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