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Design considerations for the next generation of longwall shields.

Authors
Barczak-TM
Source
Proceedings of Longwall USA, Pittsburgh, Pennsylvania, June 13-15, 2001. Overland Park, KS: Intertec Publishing Corp., 2001 Jun; :17-38
Link
NIOSHTIC No.
20021250
Abstract
Advancements in support technology have occurred to a large extent because of the demands of the mine operators. Shield supports are no exception. The most notable changes in shield technology in the past decade have been increases in shield capacity and life expectancy, which have increased by a factor of 4 and 7 respectively since the inception of the shield support 25 years ago. The purpose of this paper is to set goals for the future generations of longwall shields. These goals include: (1) 100,000 cycle life expectancy, (2) improved hydraulic diagnostic capability, (3) smart load control with adjustable setting pressure algorithms, (4) composite material design to reduce weight and increase shield width, (5) constant set leg cylinder design, (6) improved joint design to reduce wear and stress, (7) advancements in leg cylinder socket design, and (8) an instrumented shield to measure in-service structural component loading. These design issues will continue to push the envelope in longwall shield technology that has provided the safest and most productive mining system employed in the history of mining. In preparation for this, a historical examination of shield failures is made and recent trends in shield design are evaluated. Design practices to improve structural margins of current designs are also addressed.
Keywords
Mining-industry; Mining-equipment; Longwall-mining; Underground-mining; Engineering-controls; Control-technology
Publication Date
20010601
Document Type
Conference/Symposia Proceedings
Fiscal Year
2001
NTIS Accession No.
NTIS Price
NIOSH Division
PRL
Source Name
Proceedings of Longwall USA, Pittsburgh, Pennsylvania, June 13-15, 2001
State
PA; KS
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