This article discusses the issue of selecting a pick system for cutting mining machinery, concerning the reduction of vibrations in the cutting system, particularly in a load-carrying structure at work. Numerical analysis was performed on a telescopic roadheader boom equipped with transverse heads. A frequency range of the boom’s free vibrations with a set structure and dynamic properties were determined based on a dynamic model. The main components excited by boom vibrations, generated through the process of cutting rock, were identified. This was closely associated with the stereometry of the cutting heads. The impact on the pick system (the number of picks and their arrangement along the side of the cutting head) was determined by the intensity of the external boom load elements, especially in resonance zones. In terms of the anti-resonance criterion, an advantageous system of cutting head picks was determined as a result of the analysis undertaken. The correct selection of the pick system was ascertained based on a computer simulation of the dynamic loads and vibrations of a roadheader telescopic boom.
Bartn icki A., Łopatka M.J., Krogul P., Muszyński T., 2010. Dynamic stability simulations basis on Ł34 wheel loader. In proceedings: TRANSCOMP - XIV International Conference Computer Systems Aide Science, Industry and Transport, Zakopane, 89-98.
Dolipski M ., Cheluszka P., 1998. Method for determining the curve profile of the cutting-force applied by the cone bit fitted to the cutter head of a roadheading machine. Glückauf-Forschungshefte, 59, 4, 123-127.
Dolipski M. , Cheluszka P., Sobota P., 2007. Criterions of cutting heads selecton for energy-saving heading machines. Polish Mining Review, 63, 7-8, 64-70.
Dolipski M. , Cheluszka P., Sobota P., 2014. Numerical tests of roadheader’s boom vibrations. Vibrations in physical systems XXVI, 65-72.
Findeisen D., 2000. System dynamics and mechanical vibrations. Springer-Verlag, Berlin, Heidelberg, New Yourk, 382.
Gehring K., 1973. Möglichkeiten zur Beurteilung des Arbeitsverhaltens von Werkzeuge zur schneidenden Gesteinsbearbeitung. Berg- und Hüttenmännische Monatshefte, 118, Nr. 10, p. 319-327.
Keleş S., 2005 . Cutting performance assessment of a medium weight roadheader at Çayirhan coal mine. Thesis presented in partial fulfillment of the requirements for the degree of Master of Science in the Department of Mining Engineering, Ankara, pp. 58.
Marchelek K., 199 1. Dynamics of machine tools. Scientific & Technical Publishing (WNT), Warsaw, pp. 405.
Rojek J., Oñate E., Labra C., Kazal H., Akerman J., 2009. Optimizing rock cutting through computer simulation. [In:] Technology Innovation in Underground Construction (Gernot Beer, Ed.), CRC Press Inc, 299-314.
Podsiadła B. (ed.) , 2000. Modelling and research into the dynamic phenomena of telescopic booms and mobile cranes. Scientific & Technical Publishing (WNT), Warsaw, pp. 155.
Vašek J., Pinka J, 2006. Research into the “critical state” of rock cutting tools. Archives of Mining Sciences, 51, 3, 355-369.
Van Wyk G., 2012. Simul ation of tribological interactions in bonded particle-solid contacts. Thesis presented in partial fulfilment of the requirements for the degree Master of Science in Engineering, Stellenbosch, 147.
Yu B., Khair A. W., 2007. Numerical modeling of rock ridge breakage in rotary cutting. ARMA General Meeting, Vancouver, Canada, 519-526.