Journals →  Eurasian Mining →  2018 →  #1 →  Back

ArticleName Recovery of worn-out picks in rock breaking
DOI 10.17580/em.2018.01.06
ArticleAuthor Prokopenko S. A., Vorobiev A. V.

Tomsk Polytechnic University, Tomsk, Russia:

Prokopenko S. A., Professor, Doctor of Engineering Sciences,
Vorobiev A. V., Associate Professor


Mining is the most resource-intensive industry in the world. One of the critical and expensive resources is a rock-breaking tool. Widely used tangential-rotary pick, although advantageous, are expendable. A tool with a worn body (often insignificantly) is discarded. Such rejects are never reclamated. This article authors propose to sort available rejects and select picks with heads worn-out not more than by 50% of initial length. Such picks are suitable for equipment with replaceable cutting noses to be further used in rock breaking. Aside from low cost, the recovered picks become nonexpendable. By computer modeling, the optimal values of diameter and length of the nose shank, which ensure the highest strength characteristics of the picks in operation, are determined. Based on the obtained results, reconditioned picks fitted with noses with the optimal parameters were manufactured. The picks were tested on roadheader KSP-35 in a mine in 2014. Two picks were installed in the second row of the crown-type cutting head. The noses were replaced at wear limit. All in all, 18 noses were tested. The wear and tear process was uniform, no failures were observed. The life of the noses reached 3–4 weeks, which corresponded to heading for a length of 60–90 m. The calculations show that recovery and multiple use of worn picks cut the requirement of mines for purchasing new picks by an order of magnitude. Manufacture of 9 replaceable noses needs 1935 g of metal, which replaces 9 regular picks with a gross weight of 9600 g. Waste level of coal mining with respect to cutting machine picks lowers 5 times. Purchase cost of new picks is cut by 1.5–1.7 times.

The studies have been implemented in the framework of the competitive capacity upgrading program of the Tomsk Polytechnic University.

keywords Mine, pick, wear, rejects, recovery, replaceable nose, design, resource efficiency

1. Troubetzkoy K. N. The main directions and ways of solving problems of resources in complex development of mineral resources with the earth’s surface. Gornyi informatsionno-analiticheskii byulleten. 2011. Vol. S1. pр. 433–446.
2. Umnov V. A. Waste management of mining production. Gornyi informatsionno-analiticheskii byulleten. 1995. Vol. 5. pр. 99–106.
3. Miroshina V. V. Reducing the impact of solid combustible carbon-containing wastes of mining production on the environment through their recycling and disposal. Abstract. PhD Diss. St. Petersburg state mining University St-Petersburg. 2002. p. 35.
4. Komarov M. A., Aliskerov V. A., Kusevich V. I., Zavertkin V. L. Mi ning and industrial wastes is an additional source of mineral raw materials Mineral resources of Russia. Economics and management. 2007. Vol. 4. Available at: (accessed: 02.11.2015).
5. Lin Fu, Changlong Du, Jianping Li, Kehong Zheng. Influence of pick working angle on cutting performance of auger miner’s aiguilles. Advances in Mechanical Engineering. 2015. Vol. 7(5). pp. 1–10.
6. Jonker C. R., Ries B. H., Lachmann F. F. Pick assembly, pick holder for same, pick tool for same and strike ekement for same. Patent US 2014/0015305 A1. Published : 16.01.2014.
7. Dewangad S., Chattopadhyaya S. Performance analysis of two different comical picks used in linear cutting operation of coal. Arabian Journal for Science and Engineering. 2015. pp. 249–265.
8. Dewangad S., Chattopadhyaya S., Hloch S. Critical damage analysis of WC-Co tip of conical pick due to coal excavation in mines. Advances in Material Science and Engineering. 2015. p. 7.
9. Hall D. R. Pick with hardened core assembly. Patent US 8,777,326 B2 Published : 15.07.2014.
10. Chinakhov D. A. Study of thermal cycle and cooling rate of steel 30HGSA single-pass weld joints. Applied Mechanics and Materials. 2011. Vol. 52–54. pp. 442–447.
11. Prokopenko S. A., Ludzish V. S., Kurzina I. A. Design of new-class picks for cutter-loaders. Gornyi Zhurnal. 2017. No. 2. pp. 75–78. DOI: 10.17580/gzh.2017.02.14.
12. Sarwary E., Hagan P. The effect of tool geometry on cutting performance. Mining education Australia — Journal of research projects revie. 2015. Vol. 4. No. 1. pp. 43–48
13. Greenspan G., Greenspan A., Alter G. Mining and demolition tool. Patent US 2014/0191562 A 1. Published: 10.07.2014.
14. Joseph F., Alfred L. Cutting tip and cutting bit having increased strength and penetration capability. European patent specification EP 2 540 959 B1. Applished : 28.06.2011.
15. Liu X., Liu S., Lie Li., Cui X. Experiment on Conical Pick Cutting Rock Material. Assisted with Front and Rear Water Jet. Advances in Materials Science and Engineering. 2015. Article ID 506579.
16. Tompson P. N., Tank K. Cutter pick for mining using hydraulic stream. Patent US 4,902,073. Published: 20.02.1990.
17. Khoreshok A. A., Tsekhin A. M., Borisov A.Yu. Influencing of operation conditions of mining machines on the design of their effectors. Mining equipment and electromechanic. 2012. Vol. 6. pp. 2–6.
18. Kho reshok A. A., Mametyev L. E., Borisov A. Yu., Vorobyev A. V. The distribution of stresses and strains in the mating elements disk tools working bodies of roadheaders. IOP Conference Series: Materials Science and Engineering. 2015. Vol. 91. pp. 1–6.
19. Bolobov V. I., Bobrov V. L., Talerov M. P., Bochkov V. S. The reason of quick wearing of tangential cutters. Notes of Mining Institute. 2012. Vol. 195. pp. 238–240.
20. Kolesnichenko E. A., Kolesnichenko I. E., Lyubomischenko E. I., Demura V. N. Techniques for Face Ventilation According to Dust-making Ability of Roadheader. Ugol. 2012. Vol. 6. pp. 39–42.
21. Bookhamer P. A., Chad A. Stone Cutting tool with insert having a tapered bottom. Patent US 2014/0054951 A1. Published : 27.02.2014.
22. Monyak K., Mouthaan D., Fader J. Reduced volume cutting tip and cutting bit incorporating same. Patent US 8,678,517 B2. Published : 25.03.2014.
23. Parrott G. A. Extraction system for mineral cutter pick. Patent US 8,661,640 B2. Published : 04.03.2014.
24. Bell A. Metal matrix composite mining pick and method of making. Patent US 2013/02-7445 A 1. Published: 15.08.2013.
25. Khoreshok A. A. Production and operation of destructive mining machines tool. Tоmsk. 2013. p. 296.
26. Prokopenko S. A., Kurzina I. A., Lesin Yu. V. Prospects for improvement of mining machines’ cutting pick. IOP Conference Series: Materials Science and Engineering. 2016. Vol. 124(1). pp. 1–5.
27. Buyalich, G. B., Anuchin A. V., Serikov K. P. Influence of the Geometry of Beveled Edges on the Stress-Strain State of Hydraulic Cylinders. IOP Conference Series: Materials Science and Engineering. 2016. Vol. 127. No. 1. pp. 1–6.
28. Prokopenko S. A., Ludzish V. S., Kurzina I. A. Improvement of cutting tools to enhance performance of heading machines in rocks. Journal of Mining Science. 2016. Vol. 52(1). pp. 153–159. DOI: 10.1134/S1062739116010248.

Full content Recovery of worn-out picks in rock breaking