Improving the efficiency of the coal-cutting process by combining cutting teeth on the drum of the coal-cutting machine used in underground coal mining

  • Affiliations:

    Hanoi University of Mining and Geology, Hanoi, Vietnam

  • *Corresponding:
    This email address is being protected from spambots. You need JavaScript enabled to view it.
  • Received: 26th-May-2023
  • Revised: 4th-Sept-2023
  • Accepted: 30th-Sept-2023
  • Online: 31st-Oct-2023
Pages: 10 - 16
Views: 748
Downloads: 13
Rating: , Total rating: 0
Yours rating

Abstract:

Nowadays, coal mining is primarily carried out by underground method. The shearer is the main equipment used in underground coal mining in developed mining countries and it is gradually applied in underground coal mines in Viet Nam. With coal-cutting machines, using the cutting drum is applied mainly because of its simple structure, high productivity, and reliability. However, during the coal-cutting process, the fine coal content of about 40÷50% of the total mining output causes dust generation as well as energy consumption because the coal is cut too small. According to previous studies, this problem is solved by increasing the thickness of the slices, which is achieved by using larger drums with large cutting teeth, and in combination with increased speed movement of the stage machine. This increases machine size, large investment costs and reduces machine flexibility due to the tight space of mining areas. Through the research of previous authors, it is possible to increase the cross-sectional area of the slices by forming slices in pairs and groups, and at the same time enhance the failure by tensile stress instead of mostly compressive stress. In addition, the overlap of stresses around the slice, when using the coal-cutting teeth group, also reduces the cutting force on the cutting teeth. In this study, a new solution is proposed to increase the height of the cutting teeth and the width of the cutting step without increasing the local load acting on the cutting teeth by combining the cutting teeth in groups thereby reducing dust, increasing the particle size of the cutting teeth coal, reducing specific energy and increasing cutting capacity of the coal cutting machine.

How to Cite
Nguyen, L.Khac and Pham, T.Van 2023. Improving the efficiency of the coal-cutting process by combining cutting teeth on the drum of the coal-cutting machine used in underground coal mining (in Vietnamese). Journal of Mining and Earth Sciences. 64, 5 (Oct, 2023), 10-16. DOI:https://doi.org/10.46326/JMES.2023.64(5).02.
References

Chupin,S.A. (2016).Increasing the wear resistance of rotary cutters of tunneling combines for the development of rocks of medium strength.Thesis,... candidate of technical sciences. SPb: Gorny, 162 p.

Gabov, V. V., Xuan, N. V., Zadkov, D. A., and Tho, T. D. (2022). Increasing the content of coarse fractions in the mined coal mass by a combine using paired cuts. Journal of Mining Institute, 257, 764-770.

Gabov, V. V., Zadkov, D. A., Linh, N. K. (2019). Features of elementary burst formation during cutting coals and isotropic materials with reference cutting tool of mining machines. Journal of Mining Institute 236, 153-161.

Hekimoglu, O. Z., and Ozdemir, L. (2004). Effect of angle of wrap on cutting performance of drum shearers and continuous miners. Mining Technology, 113(2), 118-122.

Phạm, V. T., Nguyễn, K. L., Đoàn, V. G., Lê, T. H. T. (2018). Nâng cao hiệu quả khai thác than hầm lò bằng việc lựa chọn phương pháp cắt than tối ưu từ gương khai thác. Tạp chí Khoa học Kỹ thuật Mỏ - Địa chất, Tập 59(1), 22-25.

Peng,S.S. (2006). Longwall Mining. U.S.: 2nd edition, 621 p.

Sun, Y., and Li, X. S. (2013). Determination of attack angle and tilt angle of a cutting pick. Advanced Materials Research, 705, 415-418.

Solod,V.I., Getopanov,V.N., Rachek,V.M. (1982). Design and construction of mining machines and complexes. -M.: Nedra, 350 p.

Vinacomin (2016). Báo cáo và tham luận tổng kết công tác cơ giới hóa khai thác đào lò 2013÷2015 và định hướng đến 2020. Quảng Ninh, 299 p.

Yong, S., Li X. (2018). Slant Angle and Its Influence on Rock Cutting Performance. Advances in Civil Engineering. Article ID 6519029. 11p.

Other articles