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- Equipment, tools, and parts:
- Longwall shields
- Document types:
- Conference papers
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Results 1 - 10 of 10
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1/1/2010 - Conference papersThis paper describes the impact of ground control research by the Bureau of Mines and NIOSH on the safety of underground coal miners.
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7/1/2007 - Conference papersA cooperative study was conducted to evaluate the effectiveness of (partially) pre-driven longwall recovery rooms supported with pumpable roof supports.
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7/1/2007 - Conference papersThis paper addresses both the safety and the operational issues associated with mobile roof support (MRS) usage during shield recovery. It also discusses new developments, including the use of the inherently safer battery powered MRS's.
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6/1/2007 - Conference papersThere are fundamental aspects of support design and ground control that we still do not understand or recognize when designing a support system. These issues are evaluated and a different approach to support design is proposed.
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8/1/2006 - Conference papersThis paper explores the history of longwall shield design over the past 25 years. It also addresses questions such as whether two-legged designs are better than four-legged shields and whether setting pressures should be set as high as possible.
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8/1/2002 - Conference papersA high percentage of longwall shields, which provide ground control in mines, operate well below the rated support capacity due to hydraulic malfunctions. NIOSH developed a computer program to identify shields not performing to rated specifications.
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6/1/2001 - Conference papersA series of controlled laboratory tests were conducted in a test stand simulating shield dust entrainment to evaluate changes in airborne respirable dust levels at different air velocities.
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6/1/2001 - Conference papersThe purpose of this paper is to set goals for the future generations of longwall shields.
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2/1/2001 - Conference papersLaboratory test to simulate dust liberation during shield movement were conducted.
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8/1/1998 - Conference papersThis paper examines the operating principles of hydraulic cylinders and discusses issues pertaining to setting loads, support stiffness, yielding behavior, errors in assessing support loading, and hydraulic failure mechanisms and how to detect them.
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Content source: National Institute for Occupational Safety and Health, Mining Program