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EQUIPMENT AND MATERIALS
ArticleName Loading of coal mining machine tools after change in spatial orientation of picks
DOI 10.17580/em.2019.01.10
ArticleAuthor Zakharov V. N., Linnik V. Yu., Linnik Yu. N., Averin E. A.
ArticleAuthorData

Institute of Integrated Mineral Development – IPKON, Russian Academy of Sciences, Moscow, Russia:

Zakharov V. N., Director, Corresponding Member of the Russian Academy of Sciences

 

Federal state educational institution of the higher-education "State University of Management, Moscow, Russia:

Linnik V. Yu., Professor of Chair, Doctor of Economic Sciences, vy_linnik@guu.ru
Linnik Yu. N., Professor of Chair, Doctor of Engineering Sciences

 

Skuratovskiy opytno-ehksperimental’nyy zavod LLC, Tula, Russia:

Averin E. A., Engineer-Designer, Candidate of Engineering Sciences

Abstract

The parameters of the cutters and their spatial orientation relative to the end of the blade of the screw Executive body have a significant impact on the power and energy performance of coal-mining combines. In the designs of the Executive bodies of combines, both domestic and foreign, equipped with tangential cutters cutting edge of the latter is located above the surface of the blade end. With such a spatial orientation of the cutter for certain values of the flow velocities, which are maximum permissible for the particular design of the harvester, the clearance between the end of the blade and the bottom becomes commensurate with the broken chunks of coal, and they are getting there begin to crush. The crushing process is accompanied by the consumption of additional energy. At the same time, the energy intensity of cutting increases and the grade of coal deteriorates. In this regard, studies were carried out to identify the extent to which the spatial orientation of the cutter affects the power and energy parameters of the cutting process. The studies were conducted with tangential prismatic (not rotary) cutters and compared with the results of cutting with radial cutters. In experiments with tangential cutters, the angle of inclination relative to the cutting plane and the angle of rotation relative to the cutting speed vector were changed. It was found that at cutting radial blades for cutting forces and feed is optimum for small values of angle of inclination of the cutter 8–12, and the lateral component of the load on the cutter from the unloaded array with increasing angle of inclination decreases, and the opposite — increasing. When cutting with tangential cutters, there is also a minimum of effort in the area of the turning angle of about 12, which corresponds to the angle of inclination of the cutter 6 degrees. In this case, there is a complete balancing of lateral loads to the right and left of the cutter at a relatively low absolute level. Due to the reduction of coal overdrawing, the energy consumption of cutting has decreased and the yield of large coal (+40 mm) has increased significantly.

keywords Cutter, executive body, coal face, spatial orientation, cutting forces, energy intensity, coal grade
References

1. Tsypin Ya. L. Study and design procedure of loads on rotary picks of coal shearer drums. Candidate of Engineering Sciences Dissertation. Moscow : IGD Skochinskogo, 1986.
2. Pozin E. Z., Melamed V. Z., Azovtseva S. M. Coal Grinding in Cutting. Moscow : Nauka, 1977. 138 p.
3. Pozin E. Z., Melamed V. Z., Azovtseva S. M. Determination Procedure of Coal Grindability in Cutting. Moscow : IGD Skochinskogo, 1974. 17 p.
4. Arsentiev Yu. A., Soloviev N. V., Nazarov A. P., Limitovsky A. M. Effect of PDC cutter rake on penetration rate of wing bit drilling in variable hardness rocks. Gornyi Zhurnal. 2018. No. 11. pp. 47–50. DOI: 10.17580/gzh.2018.11.08
5. Melnov K. V., Gavrilin A. N., Khairullin A. R. Design and manufacturing methods to reduce dynamic loads on PDC cutters in drilling. Proceedings of XXVII International Innovation-Oriented Conference of Young Scientists and Students MIKMUS-2016. 2017. pp. 376–379.
6. Bugaev V. G., Eresko S. P., Bugaev I. V. Experimental load tests and force relationships on picks in various strength frozen soil drilling. Stroitelnye i dorozhnye mashiny. 2018. No. 6. pp. 53–59.
7. Zhabin A. B., Lavit I. M., Chebotarev P. N., Polyakov A. V. Methods of failure mechanics in calculation of loads on coal cutting machine picks. Gornoe oborudovanie i elektromekhanika. 2017. No. 3(130). pp. 28–34.
8. Isakow Z. Geotomography with the help of a cutter–loader working organ as a source of imaging waves. International Journal of Rock Mechanics and Mining Sciences. 2009. Vol. 46, Iss. 7. pp. 1235–1242.
9. Bin Yu, Jun Zhao, Tiejun Kuang, Xiangbin Meng. In situ investigations into overburden failures of a super-thick coal seam for longwall top coal caving. International Journal of Rock Mechanics and Mining Sciences. 2015. Vol. 78. pp. 155–162.
10. Naeimipour A., Rostami J., Buyuksagis I. S., Frough O. Estimation of rock strength using scratch test by a miniature disc cutter on rock cores or inside boreholes. International Journal of Rock Mechanics and Mining Sciences. 2018. Vol. 107. pp. 9–18.
11. Wang G., Pang Y. Surrounding rock control theory and longwall mining technology innovation. International Journal of Coal Science & Technology. 2017. Vol. 4, Iss. 4. pp 301–309.
12. Wang J., Yu B., Kang H. et al. Key technologies and equipment for a fully mechanized top-coal caving operation with a large mining height at ultra-thick coal seams. International Journal of Coal Science & Technology. 2015. Vol. 2, Iss.2. pp. 97–161.
13. Zhang C., Wang L., Du J., Tian Y. Numerical modelling rock deformation subject to nitrogen cooling to study permeability evolution. International Journal of Coal Science & Technology. 2015. Vol. 2, Iss. 4. pp. 293–298.
14. Li M., Luo Y., Jiang H. Effects of proper drilling control to reduce respirable dust during roof bolting operations. International Journal of Coal Science & Technology. 2016. Vol. 3, Iss. 4. pp. 370–378.
15. Cheng Y., Wang L., Liu H. et al. Definition, theory, methods, and applications of the safe and efficient simultaneous extraction of coal and gas. International Journal of Coal Science & Technology. 2015. Vol. 2, Iss. 1. pp. 52–65.
16. Ju Y., Luxbacher K., Li X. et al. Micro-structural evolution and their effects on physical properties in different types of tectonically deformed coals. International Journal of Coal Science & Technology. 2014. Vol. 1, Iss. 3. pp. 364–375.

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