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Mining Publication: Technology News 480 - Controlled Start for Drill Motors on Roof Bolting Machines
Keywords: Bolters Drills
Original creation date: February 2000
Authors: JP DuCarme
Technology News - February 2000
Download PDF Document (0.20 MB)
NIOSHTIC2 Number: 20000483
Pittsburgh, PA: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, Technology News 480, 2000 Feb :1-4
Operators of roof bolting machines have one of the most dangerous jobs in underground mining. The main hazards include unsupported roof and movement of equipment and machine appendages in confided surroundings. Many bolter operators have been injured because their hands or gloves have been caught by rotating drill steels or bolt wrenches. A bolter operator must manually place the drill steel and wrench into the drill chunk and then hold onto it as the drill is guided to the hole placement or the wrench is raised to the bolt head. During these actions, the inadvertent actuation of the drill's rotation control can catch the operator's hand or glove, which can cause serious injury. NIOSH , Pittsburgh Research Laboratory, has developed a mechanical/hydraulic method to reduce this type of injury. Although an experienced bolter operator can sometimes 'feather' the hydraulic controls on modern bolting machines to achieve a relatively slow rotational speed, the control designs are not normally optimized for this. Inadvertent control actuation invariably results in full-on operation. The main reason for these types of incidents is that the sudden full-speed rotation of the drill catches the operator by surprise. The technique that we developed intentionally limits the rotational speed and torque of the hydraulic drill motor(s) for several seconds during startup. During this time, the operator has the chance to see that drill rotation has started and can stop the rotation or release his/her hand before injury occurs. The technology is suited for incorporation into new machine designs by the manufacturer or implementation by mines or rebuild shops on a retrofit basis.
Image of publication Technology News 480 - Controlled Start for Drill Motors on Roof Bolting MachinesTechnology News - February 2000
Download PDF Document (0.20 MB)
NIOSHTIC2 Number: 20000483
Pittsburgh, PA: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, Technology News 480, 2000 Feb :1-4
See Also
Comparison of Methane Concentrations at a Simulated Coal Mine Face During Bolting
Development of Roof-Bolting Machine Bit and Chuck Isolators for Drilling Noise Reductions
Machine Injury Prediction by Simulation Using Human Models
A Noise Control for A Roof Bolting Machine: Collapsible Drill Steel Enclosure
Roof Screening: Best Practices and Roof Bolting Machines
Sound Power Level Study of a Roof Bolter
Technology News 447 - Dust Collector Discharge Shroud Reduces Dust Exposure to Drill Operators at Surface Coal Mines
Upper Extremity Joint Moment and Force Predictions When Using a Joystick Control
Verification and Validation of Roof Bolter Simulation Models for Studying Events Between a Machine and its Operator
Wearing Hearing Protection Properly: A 3-D Training Aid for Drillers
Page last reviewed: September 21, 2012
Page last updated: September 21, 2012
Content source: National Institute for Occupational Safety and Health, Mining Program
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