Report of Investigations 9536: Improved Performance of Linear Coal Cutting Compared with Rotary Cutting

Details

• Journal Article:
  Minneapolis, MN: U.S. Department of the Interior, Bureau of Mines, RI 9536
• Personal Author:
  Hanson, Bruce D. ; Myren, Theodore A. ; Olson, Richard C. ; Roepke, Wallace W. ; Wingquist, Carl F.
• Description:
  The linear cutting system, developed by the U.S. Bureau of Mines, uses geometric principles developed by Cardan to produce a nearly constant cut depth. The new system has been extensively tested in a synthetic material under laboratory conditions to verify mechanical capability and to identify operational characteristics. Comparisons between 15-rpm linear cutting and 50-rpm rotary cutting systems show significant improvement in respirable dust entrainment, product size distribution, and energy usage. Respirable dust is reduced by as much as 90 pct. Recovered product showed a 67-pct reduction in -0.32-cm (-1/8-in) material and a 200-pct increase in +5.08 cm (+2 in) material. Average power was reduced by 66 pct for the linear cutting. Because the bit cutting paths differ between linear and rotary cutting, it was necessary to compare the two at the same cut depths and bit types. These comparisons show that low revolution per minute rotary cutting entrains about the same amount of respirable dust as the linear cutting system, but the average shaft torque may be 55 to 130 pct greater for the rotary system. [Description provided by NIOSH]
• Subjects:
  Coal Coal Mining Mining Occupational Health Safety
• Keywords:
  Bits; Continuous-mining; Linear-systems; Rotating-machinery; Rotary-drill-bits; Coal-mining; Cutting-tools; Mining-industry; Mining-equipment
• Source:
  Minneapolis, MN: U.S. Department of the Interior, Bureau of Mines, RI 9536, 1995 Jan; :1-43
• Series:
  NIOSH Numbered Publications   ; Mining Publications  
• Subseries:
  Report of Investigations
• Document Type:
  Text
• Genre:
  Report
• Place as Subject:
  Minnesota ; OSHA Region 5
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  TCRC - Twin Cities Research Center
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  41 pdf pages
• NIOSHTIC Number:
  nn:20039213
• NTIS Accession Number:
  PB95-216941
• Federal Fiscal Year:
  1995
• Peer Reviewed:
  False
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:3c8fccfbcd744bac29d3c558ab193a976e6341c8da13fda220deeebf6382109bc334c0002311cb8f9a87c70e67dba27efbbae6859b5ef465cb566895fd89dc25
• Download URL:
  https://stacks.cdc.gov/view/cdc/10162/cdc_10162_DS1.pdf
• File Type:
  [PDF - 6.93 MB ]