Flexible roof drill for low coal. Volume 2. Phase III and Phase IV

Technical Report · Thu Sep 01 04:00:00 EDT 1977

DOI:https://doi.org/10.2172/6610727· OSTI ID:6610727

Shoup, N H

Design specifications were developed for a flexible drilling and bolting system. The system configuration is based on the use of the Galis dual-boom roof drill as a vehicle for the drilling/bolting system. The WSU Flex-drill drivehead is mounted on the Galis drill boom and the Galis parts are modified to accommodate the revised system. The flexible drillhead supports a bolt bender/inserter designed by Bendix Corporation and is integrated into the system operation. A supplemental bolt thruster was designed to complete insertion of the roof bolt following operation and removal of the Bendix bender from the bolt shank. The complete cycle of drilling a 1-3/8-in. diameter bolt hole, bending a roof bolt into the hole, thrusting the bolt head and washer to the roof surface, and final torquing of the bolt is manually controlled by the operator located in the new position behind the bolting line. The new operating position is beneath newly bolted roof in a safer location in back of the stab jack ad roof jacks positioning the drill boom and drivehead. The Flex-drill/bolting system prototype was constructed from both purchased components and parts specially fabricated in the shops for this design. This unit was assembled and test-operated with appropriate support equipment in a laboratory test stand. Numerous test holes were drilled in blocks of concrete at feed rates of 5 ft/min with drill rotation speeds of 360 rpm. The drill feeds uniformly and cuts smoothly with no difficulty in collection of dust or clogging of the drill bit. The holes drilled were straight, as evidence by passage of a 1-1/4-in. diameter bar full depth into the hole with no binding or evidence of curvature. The flexible drill is capable of drilling 8-ft-deep roof bolt holes in low coal 36 in. in height.

• Research Organization: Washington State Univ., Pullman (USA). Dept. of Mechanical Engineering
• DOE Contract Number: AC01-74ET12579
• OSTI ID: 6610727
• Report Number(s): DOE/ET/12579-T1(Vol.2)
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
012000* -- Coal
Lignite
& Peat-- Mining
42 ENGINEERING
420206 -- Engineering-- Mining & Drilling Equipment & Facilities-- (1980-1989)
COAL DEPOSITS
COAL MINING
COAL SEAMS
CONSTRUCTION
CONTROL
DESIGN
DIMENSIONS
DRILLING EQUIPMENT
ENGINEERING
EQUIPMENT
GEOLOGIC DEPOSITS
INSTALLATION
LENGTH
MINERAL RESOURCES
MINING
MINING EQUIPMENT
REMOTE CONTROL
RESOURCES
ROOF BOLTS
SAFETY ENGINEERING
TESTING
THICKNESS
UNDERGROUND MINING