Rock Products

MAR 2019

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Page 44 of 95 ROCK products • March 2019 • 43 EQUIPMENT & TECHNOLOGY DRILLING & BLASTING U.S. Patent No. US 9,770,682 was issued for a fresh air intake system for over- burden drills. This innovative fresh air intake system for overburden drills supplies clean air into the operator's cab simply, reliably and effectively. Air from the cleanest point accessible for an overburden drill – the top of the mast – is routed through an intake designed to passively accommodate the raising and lowering of the mast. The system overcomes common main- tenance concerns. The primary intake filter is adapted from other applica- tions on site, simplifying inventory and reducing cost. A hydraulically driven, industrial blower supplies air under pressure in amounts sufficient to overcome worn or leaking cab air seals. And, the system can be used independently or in conjunction with a variety of traditional cab air condition- ing units. Respirable dust levels at one site were reduced by more than 80 percent with this system performing flawlessly and requiring minimal maintenance – all contributing to increased drilling effi- ciencies and an improved operator working environment. This patented system may also be adaptable to supplying cleaner air to the drill engine and compressor, thereby further improving drilling cost and efficiency. Source: Blake Allan Massey, Jasper, Ala. Jimco offers the JH20/323F drill, con- sisting of the full capacity 20-ft. drill boom option of the John Henry Rock Drill on the Caterpillar excavator plat- form. Excellent penetration rates are achieved by dedicating full power of the excavator to drilling functions. The following components are included: Feed – Heavy Duty tubular steel design with a 20-ft. leading rod capacity. Stain- less steel feed rails are combined with low friction nylon slides for smooth drifter travel. Variable feed pressure is applied through a motor/gearbox/ chain combination providing 30,000-lb. retraction force. An extendable single point foot provides a secure hold for accurate positioning. Hydraulic cen- tralizers with replaceable inserts are included. Drifter – "Dry Fire" model and simple design providing more than 350 ft. of impact energy per blow and up to 2,000 blows per minute. Designed for drilling with T38, T45 or T51 steel, this model provides excellent penetration in holes ranging from 2 ½- to 4.5-in. in diameter. Compressor – The John Henry com- pressor is rear mounted (in lieu of the counterweight) and provides 375 cfm of flushing air at a maximum pres- sure of 150 psi. This oil flooded rotary screw design is powered by a Cummins 130-hp diesel engine. The volume of air delivered for flushing is variable from the operators control panel. Hydraulic System – The excavator is the primary source of power for all hydraulic John Henry drill functions. A dependable pilot operated hydraulic system (not an electric system) is used to direct the flow of oil to the drill pack- age. Standard excavator functions and controls are not affected. Heavy-duty steel tubing is used in combination with hydraulic hosing for all hydraulic connections. Controls – The control panel, located in the operators cab, contains pilot controls for tilt, rotation, air, feed, and impact. Rotation speed, feed pressure, air volume, and water suppression are all fully adjustable from this panel. Feed pressure and air pressure gauges are located here as well. An electronic level indicator is standard. Dust Control – A water suppression system is provided. A hydraulically driven duplex pump transfers water from a stainless steel 60-gal. tank into the flushing air stream. An optional Dry Type 900 CFM dust collection system is available upon request. Jimco/John Henry Drills, Jimco Offers the John Henry JH20/323F Drill New Patent: Fresh Air Intake System For Overburden Drills

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