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Shield the typical cutter combination rock breaking force characteristics

Author: OuYangTao
Tutor: XiaYiMin
School: Central South University
Course: Mechanical Engineering
Keywords: Tool combination Mechanical model Disc cutter Scraper First knife
CLC: U455.3
Type: Master's thesis
Year: 2011
Downloads: 115
Quote: 1
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Abstract


With the underground space construction needs and improve the level of science and technology in recent years, the Shield Law as a primary means of underground space construction, the shield tunneling machine construction technology in our country has been widely used in the development of the shield tunneling machine technology also attaches great importance to the relevant departments of the State and construction enterprises. Main shield shield cutting tool on the shield cutter rock breaking boring, but because of the complex geological conditions, a tool often unable to adapt to a variety of geological conditions, therefore, the shield cutter is often used in engineering and more kinds of tool combinations arranged, multi-tool combination cutting the mechanical properties of the rock breaking become a key issue, and therefore must be multi-tool combination of cutting the mechanical properties of the rock breaking study, which enhance the use of the tool performance optimization tool configuration, and improve tool life has important significance. In-depth analysis of a single hob and hob combination of cutting rock breaking mechanism, and hob pressure head under the stress state of the rock material analysis through the hob structural parameters and combinations of parameters to hob rotary cutting process research proposed adjacent hob Q phase difference caused by the hob tunneling interface is not flat and hob installation radius the smaller the larger the difference between the amount of rock breaking hob inside and outside conclusion, this combined hob combination of cutting-breaking Rock mechanism, establish hob three-way rotary cutting force model. Build a rotary tool cutting performance test platform, with the three-way the hob rotary cutting force model, the test-bed for experimental verification, through the hob cutting three-force model, expand on the Hob three forces with structural parameters, The study of the changing characteristics of the operating parameters as well as the parameters of the hob combination hob rotary cutting three force variation with different parameters Finally, a brief discussion of each combination of parameters selected project. Cutting characteristics and cutting class first knife and scraper combination tool rock breaking mechanism, the use of large-scale simulation software ANSYS / LS-DYNA finite element model established first knife scraper combination of cutting, on the the first knife scraper combination of cutting simulation defined the amount of rock breaking and cutting force ratio of the first the knife scraper combination of cutting energy efficiency, energy efficiency through the simulation proceeds cutting and cutting force analysis, and ultimately get the optimal height difference combination of the first and scraper combinations, and an engineering case verified by the simulation results, confirming the correctness of the results of the simulation, and then as a known quantity to the optimal combination of height difference, the cutting speed and depth of cut on the first knife and scraper combination force, the first knife and scraper combination cutting force with the cutting speed and depth of cut variation.

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CLC: > Transportation > Road transport > Tunnel project > Tunnel construction > Construction machinery
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