Affiliation:
1. Beijing Forest University, Beijing / China
Abstract
In the abandoned mine area with Karst landform in China, soils are few and thin but rocks are common, traditional planting hole diggers are unequal to work in rocks for vegetation restoration. A reamer bit with variable lateral drilling radius was designed based on the PDC (polycrystalline diamond compact) bit technology and metamorphic mechanism. Two lateral camber blades with PDC teeth were installed inside the bit body, a screw mechanism was employed as the actuation and a spatial double triangle mechanism was taken for the transmission. The curve of the camber blade was specially defined thus the reaming load was decentralized to 85.7% teeth on the blade. The kinematics of the lateral reamer bit was analysed, the mapping models from the actuation to the reaming radius and speed were established. Concrete samples were reamed indoors from 240mm to 407mm in diameter, the reaming cutting load and time length were measured and analysed. The lateral reamer bit was approved with the experiment results, this study provided equipment support for digging the planting hole in rocky abandoned mine areas and also expanded the PDC bit application.
Subject
Industrial and Manufacturing Engineering,Mechanical Engineering,Food Science
Reference17 articles.
1. Akbari B, Miska S. (2016). The effects of chamfer and back rake angle on PDC cutters friction[J]. Journal of Natural Gas Science and Engineering, 33, 347-353.
2. Abugharara A.N, Mohamed B, Hurich C, Molgaard J. (2019). Experimental investigation of the effect of shale anisotropy orientation on the main drilling parameters influencing oriented drilling performance in shale[J]. Journal of Energy Resources Technology-Transactions of the ASME, 141(10).
3. Dai XW, Huang ZW, Shi HZ, Cheng Z. (2020). Rock failure analysis based on the cutting force in the single PDC cutter tests[J]. Journal of Petroleum Science and Engineering, 194.
4. Dai QH, Yan YJ. (2018). Advances in studies on rocky desertification and soil erosion in Karst regions in southwest China [J]. Journal of Soil and Water Conservation, 32(02), 1-10.
5. Hu ZH. (2020). Design and Construction of hydraulic reaming device [J]. Construction Technology, 49(01), 48-50.