Characteristics of different rocks cut by helical cutting mechanism
- 129 Downloads
To research the loading characteristic of rocks with different structures cut by helical cutting mechanism (HCM), three different structures of rock (hard-soft-hard rock, soft-hard rock and soft-hard-soft rock) were built. And each type model was further divided into three types when the experiments were carried out. To reduce the errors of cutting load caused by manually configured rock in each test, the cutting load of soft rock was taken as a benchmark, and the differences of the cutting load of the different structures of rocks and the soft rock were used to reflect the cutting load change rules of the HCM. The results indicate that, the cutting load of only the HCM top cutting hard rock is larger than that of only the HCM bottom cutting hard rock for dextral HCM, and the cutting load fluctuation is larger, too. However, when the top and the bottom of the HCM cutting hard rock simultaneously, its cutting load is the largest, but the cutting load fluctuation is the least. And the HCM cutting load increment is increased linearly with the increase of rock compressive strength. The HCM cutting load increment is increased exponentially with the increase of hard rock cutting thickness.
Key wordshelical cutting mechanism rock model cutting load load fluctuation compressive strength
Unable to display preview. Download preview PDF.
- HEKIMOGLY O Z, OZDEMIR L. Effect of angle of wrap on cutting performance of drum shearers and continuous miners [J]. Transactions of the Institutions of Mining and Metallurgy, 2004, 113(2): 118–122.Google Scholar
- BO Yu. Numerical simulation of continuous miner rock cutting process [D]. West Virginia: College of Engineering and Mineral Resources, West Virginia University. 2005.Google Scholar
- XIA Yi-min, NIE Si-jun, BU Ying-yong, ZHAO Hai-ming. Distribution properties of cutting tooth’s maximum load of spiral mining head for cobalt-crust [J]. Journal of Central South University: Science and Technology, 2007, 38(3): 512–516. (in Chinese)Google Scholar
- AYHAN M, EYYUBOGLU E M. Comparison of globoid and cylindrical shearer drums’ loading performance [J]. The Journal of South African Institute of Mining and Metallurgy, 2006, 106(1): 51–56.Google Scholar
- BILGIN N, DEMIRCM M A, COPUR H, BALCIA C, TUNCDEMIRA H, AKCIN N. Dominant rock properties affecting the performance of conical picks and the comparison of some experimental and theoretical results [J]. International Journal of Rock Mechanics & Mining Sciences, 2006, 43(1): 139–156.CrossRefGoogle Scholar
- MISHRA B. Analysis of cutting parameters and heat generation on bits of a continuous miner-using numerical and experimental approach [D]. West Virginia: College of Engineering and Mineral Resources, West Virginia University. 2007.Google Scholar
- LI Xiao-huo, SONG Bo, WANG Dan, LIN Qi-yue. Design and Simulation study of man-machine contact surface system for grooving section pattern of horizontal cutting head [J]. Journal of Liaoning University of Technology: Natural Science Edition, 2009, 29(6): 392–395. (in Chinese)Google Scholar
- LIU Song-yong, DU Chang-long, CUI Xin-xia. Experimental research on picks arrangement of shearer drum [J]. Journal of Central South University: Science and Technology, 2009, 40(5): 1281–1287. (in Chinese)Google Scholar