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Improved performance of linear coal cutting compared with rotary cutting.

Authors
Roepke-WW; Hanson-BD; Olson-RC; Wingquist-CF; Myren-TA
Source
Minneapolis, MN: U.S. Department of the Interior, Bureau of Mines, RI 9536, 1995 Jan; :1-43
Link
NIOSHTIC No.
20039213
Abstract
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.
Keywords
Bits; Continuous-mining; Linear-systems; Rotating-machinery; Rotary-drill-bits; Coal-mining; Cutting-tools; Mining-industry; Mining-equipment
Publication Date
19950101
Document Type
Report of Investigations
Fiscal Year
1995
NTIS Accession No.
PB95-216941
NTIS Price
A03
Identifying No.
RI-9536
NIOSH Division
TCRC
Source Name
Minneapolis, MN: U.S. Department of the Interior, Bureau of Mines, RI 9536
State
MN
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