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Development and Testing Results of Output Torque Indicator for Underground Mine Roof Bolting Machine.

Brest Van Kempen CJH; Sweet RM
For Reference Only At Bureau Libraries :197 pages
The objective of this investigation was to provide thrust and torque control and visual output torque readout systems to an existing mine roof bolting machine and to test the consistency of torques obtained under actual field conditions. A Lee Norse TD1 roof bolter was modified by adding a simple torque sensing device to the drill rotation mechanism and a pneumatic logic control circuit that measures torque and controls the hydraulic circuit to the rotation motor. The modification controls and indicates the final installation torque of mine roof bolts. Over 5,000 mechanical roof bolts were installed in an operating coal mine. The installed torque of these bolts were within an error band (standard deviation) of 8 pct.
Publication Date
Document Type
CP; Final Contract Report;
Fiscal Year
Identifying No.
OFR 131-82
NIOSH Division
Source Name
For Reference Only At Bureau Libraries
Performing Organization
Envirotech Corp.
Page last reviewed: November 12, 2021
Content source: National Institute for Occupational Safety and Health Education and Information Division