Influence of rock type on regularities of excavator bucket tooth crown wear

Regularities of the process of wear of the crowns of an excavator bucket tooth made of high-carbon chromium-manganese steels are investigated, depending on the work on coarse (granite for blasting) and fine (quarry sand) abrasive rock in order to establish the sides of the crown that require increased wear resistance. Based on the analysis of the nature of the change in the geometric profile of the crown, depending on the type of rock, the location, type and size of defects on the lower and upper surfaces of the tooth crown, the results of measuring the hardness of the working surfaces of the crowns, a conclusion is drawn up on the difference in the mechanism of wear of the upper and lower sides of the crown when working on large lumpy rock. rock — in the case of the upper side, this is shock-abrasive wear, characterized by a relatively low rate of weight loss, in the case of the lower side, it is purely abrasive wear, proceeding with high intensity. As a result, the lower side wears out at a faster rate than the upper side and the crown loses its symmetry. For fine rock, both sides of the crown are purely abrasive and wear at the same rate while maintaining the symmetry of the crown shape. It is concluded that in order to increase the service life of the crowns in the case of coarse rock, it is necessary to increase the wear resistance, mainly of the lower side, and when working on the finely dispersed, both sides.

Keywords: excavator, excavator bucket tooth crown, crown top surface, crown bottom surface, granite, coarse abrasive rock, fine abrasive rock, sand, abrasive wear, shock-abrasive wear.
For citation:

Bolobov V. I., Akhmerov E. V., Rakitin I. V. Influence of rock type on regularities of excavator bucket tooth crown wear. MIAB. Mining Inf. Anal. Bull. 2022;(6−2):189—204. [In Russ]. DOI: 10.25018/0236_1493_2022_62_0_189.

Acknowledgements:
Issue number: 6
Year: 2022
Page number: 189-204
ISBN: 0236-1493
UDK: 621.879.31
DOI: 10.25018/0236_1493_2022_62_0_189
Article receipt date: 14.01.2022
Date of review receipt: 04.04.2022
Date of the editorial board′s decision on the article′s publishing: 10.05.2022
About authors:

Bolobov V. I.1, Dr. Sci. (Eng.), professor, ORCID ID: 0000-0002-0810-0132, email: boloboff@mail.ru;
Akhmerov E. V.1, graduate student, ORCID ID: 0000-0003-1692-4745, email: s195040@stud.spmi.ru;
Rakitin I. V.1, student, ORCID ID: 0000-0002-7874-1859, email: ilja.rakitin@mail.ru;
1 Saint-Petersburg Mining University, 21st Line, St Petersburg 199106, Russia.

 

For contacts:

Akhmerov Erik Viktorovich, email: s195040@stud.spmi.ru.

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