Siberian Federal University (Krasnoyarsk, Russia):

Shigin A. O., Assistant Professor, Candidate of Engineering Sciences, e-mail: shigin27@rambler.ru

Drilling in complicated-structure rocks with depth-wise variable physico-mechanical properties is often affected by high impact loading and vibration that result in increased repeated stress over the drill tool. It is possible to escape durability degradation of drill bits by raising their strength and reliability, or by introducing a new element to balance the impact loading, or else by applying an adaptable rotary–feed mechanism capable to early detect alteration of rock properties and duly adjust drilling regime. After the theoretical research and experimental analysis, mechanical characteristics of the adaptable rotary–feed mechanism of drilling machine were obtained. The adaptable rotary–feed mechanism will allow taking advantage of a narrow gap between stresses in rolling bodies and ultimate strength of material, owing to which durability of rolling drill bits will greatly increase at the same or even higher capacity of drilling machine. Majority of available rotary–feed mechanisms lack the special-purpose system adaptable to alteration of rock properties. The author describes designs of the adaptable rotary–feed mechanisms applicable with the modernized existing rotary drilling machines and with the newly designed rock drills.

1. Tekhnika, tekhnologiya i opyt bureniya skvazhin na karerakh (Technics, technology and experience of well-sinking at open pits). Under the editorship of V. A. Peretolchin. Moscow : Nedra, 1993, 286 p.
2. Goldshteyn M. I., Grachev S. V., Veksler Yu. G. Spetsialnye stali : uchebnik dlya vuzov (Special steels : tutorial for universities). Moscow : Metallurgiya, 1985, 408 p.
3. Anurev V. I. Spravochnik konstruktora-mashinostroitelya : v trekh tomakh. Tom 2. Vosmoe izdanie, pererabotannoe i dopolnennoe (Reference book of designer and mechanic engineer : in three volumes. Volume 2. Eighth edition, revised and enlarged). Under the editorship of I. N. Zhestkova. Moscow : Mashinostroenie, 2001, 912 p.
4. Gilev A. V., Shigin A. O. Fundamentalnye issledovaniya – Fundamental research, 2010, No. 11, pp. 4.
5. Shigin A. O. Vestnik mashinostroeniya – Russian Engineering Research, 2011, No. 5, pp. 3.
6. Poderni R. Yu. Gornye mashiny i kompleksy dlya otkrytykh rabot : uchebnoe posobie. Chetvertoe izdanie (Mining machines and complexes for open casting : tutorial. Forth edition). Moscow : Publishing House of Moscow State Mining University, 2001, 422 p.
7. Poderni R. Yu. Analiz konstruktsiy i tekhnologicheskikh vozmozhnostey sovremennykh stankov vrashchatelnogo bureniya vzryvnykh skvazhin na otkrytykh rabotakh (Analysis of designs and technological possibilities of modern rotary rigs of blast hole drilling during the open casting). Gornaya tekhnika (Mining engineering). 2008, pp. 116–125.
8. Filippovskiy Yu. V. Rezultaty ispytaniy otechestvennykh i zarubezhnykh sharoshechnykh dolot na karerakh Aktsionernoy Kompanii «ALROSA» (Results of testings of Russian and foreign rolling cutters at open pits of «ALROSA» JSC). Aktualnye problemy razrabotki kimberlitovykh mestorozhdeniy: sovremennoe sostoyanie i perspektivy resheniya : sbornik dokladov (Urgent problems of development of kimberlite deposits: modern status and prospects of solution : collection of reports). «ALROSA» JSC. Moscow : «Ore and Metals» Publishing House, 2002, pp. 64–70.
9. Reshetnyak S. P. Gornaya promyshlennost – Mining industry, 2009, No. 5, pp. 18–29.