Journals →  Obogashchenie Rud →  2019 →  #2 →  Back

ArticleName Design and process parameters of an air hammer for oversize reduction
DOI 10.17580/or.2019.02.01
ArticleAuthor Yungmeyster D. A., Brichkin V. N., Isaev A. I.

St. Petersburg Mining University (St. Petersburg, Russia):

Yungmeyster D. A., Professor, Doctor of Engineering Sciences,
Brichkin V. N., Head of Chair, Doctor of Engineering Sciences,
Isaev A. I., Associate Professor, Candidate of Engineering Sciences,


The article discusses oversize reduction in the operation of crushers, in handling of frozen rocks on receiving hopper grizzly grates at metallurgical enterprises and processing plants, when crushing large metallurgical castings, and in a number of other applications. Within the framework of the problem, a hammer drill design is presented, enabling operation in the impact and impact-rotation modes, which significantly increases the scope of application of the presented oversize reduction device actuator. The design of the oversize reduction actuator is considered, including a double hammer drill installed on a handling unit chassis. The article presents the results of experimental studies to identify the main parameters of the proposed hammer actuator and describes the dependencies for the peak penetration value at different cutting edge angles for the rock being cut by establishing the dependence in the power form as a function of its energy and impact frequency. A formula is proposed for calculating the theoretical performance of the hammer drill, taking into account the impact frequency and the cutting edge angle of the rock-cutting tool. The article highlights that the use of pneumatic impactors with increased impact system efficiency in crushers enables the application of compressed air jets for cleaning the receiving openings, grates and conveyor belts, which expands the applications for this design.

keywords Crusher, hammer drill, oversize, handling unit, rockcutting tool, impact actuator, performance

1. Kutuzov B. N., Tyupin V. N. Drilling and blasting design method to ensure preset fragmentation of rocks in open pit mining. Gornyi Zhurnal. 2017. No. 8. pp. 66–69.
2. Sinev S. V. Rock drillability and the most efficient drilling tool selection. Gornyi Zhurnal. 2018. No. 12. pp. 59–64.
3. Eremenko V. A., Neguritsa D. L. Efficient and active monitoring of stresses and strains in rock masses. Eurasian Mining. 2016. No. 1. pp. 21–24.
4. URL:
5. Boyko P. F., Titievsky E. M., Timiryazev V. A. Process features of operation, repair, reconditioning and modernization of cone crushers of high unit capacity. Gornyi Zhurnal. 2017. No. 4. pp. 71–75.
6. Belov A. S. Application of screw-toothed crushers at kimberlite deposits. Obogashchenie Rud. 2016. No. 5. pp. 3–7.
7. Tretyak A. A., Grossu A. N., Borisov K. A. Influence of structural features of diamond carbide drill bits on rock drilling efficiency. Gornyi Zhurnal. 2018. No. 2. pp. 85–90.
8. Rahimdel M. J., Ataei M. Application of analytical hierarchy process to selection of primary crusher. International Journal of Mining Science and Technology. 2014. Vol. 24, Iss. 4. pp. 519–523.
9. Pat. 2599115 Russian Federation.
10. Kallel M., Zouch F., Antar Z., Bahri A., Elleuch K. Hammer premature wear in mineral crushing process. Tribology International. 2017. Vol. 115. pp. 493–505.
11. Bruchmueller T., Huegel N., Wacker S., Matthiesen S. Modelling of tool workpiece interactions — coefficient of restitution for Hammer drilling of concrete. Forschung im Ingenieurwesen. 2018. Vol. 82. pp. 1–10.
12. Chang-Heon Song, Ki-Beom Kwon, Min-Gi Cho, Joo-Young Oh, Dae-Young Shin, Jung-Woo Cho. Development of lab-scale rock drill apparatus for testing performance of a drill bit. International Journal of Precision Engineering and Manufacturing. 2015. Vol. 16, Iss. 7. pp. 1405–1414.
13. Yungmeyster D. A., Isaev A. I. Tunneling systems fitted with duplex-impact operating member for the short relieving tunnel driving with tubbing lining. Journal of Industrial Pollution Control. 2017. Vol. 1, Iss. 33. pp. 914–919.
14. Yungmeyster D. A. Research of modernized perforatorhammer for special roadway the underground mines «Metrostroy». Zapiski Gornogo Instituta. 2016. Vol. 218. pp. 281–288.

Language of full-text russian
Full content Buy