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Hydracore Drills Ltd. We manufacture lightweight drills and drilling equipment for mineral exploration |
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| GOPHER 2000 SPECIFICATIONS |
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Like most Hydracore Drills it is the most compact machine of this capacity available. Everything has been designed for maximum efficiency while keeping the machine simple so that it can still be repaired in the field by the average driller. Capacity is rated at 2000 feet B or 1500 feet N, although 3000 feet B has been achieved.
The Drill Head and Hydraulic Chuck The Drill head has a standard Longyear hydraulic chuck A though H size jaws can be fitted. One well known weakness in the design of the Longyear chuck is the opening cylinder. The seals in this cylinder wear quickly and are difficult to replace. On the Hydracore 2000 head the cylinder is replaced with two side mounted cylinders with more durable seals that are easily replaced. The 2 main bearings are grease lubricated, oil leaks and contamination are avoided. A Gates toothed polyurethane belt transmits power from the Rexroth variable displacement bent axis motor. The standard reduction ratio is 3.6 : 1 . The Gates Poly Chain belt is highly efficient, long lasting, and requires no lubrication. The displacement of the motor can be varied by adjusting a valve on the control panel while drilling to vary the speed from 470 to 1550 RPMs. At the low speed the maximum torque is 819 ft lbs. For rod breaking in reverse low speed and extra high pressure is automatically engaged so that 1200 ft lbs. are available. The total weight of the head is only 510 lbs.
The Feed Frame The Feed Frame is of simple, strong, and compact design. A very unique, and simple double telescopic cylinder is used that drives the head directly with no chains required. The cylinder is completely protected from damage inside the feed frame. The standard stroke is 60 ½"; the maximum thrust and pullback is 9420 lbs. The carriage rides on 12 easily replaceable cam follower bushings. The steel rails that the head rolls on bolt onto the feed frame so that they can also be easily replaced. The total weight of the feed frame with the foot clamp is only 460 lbs. The length of the feed frame is only 100" which is 24" to 45" shorter that competitive drills. A definite advantage where space is at a premium.
The Foot Clamp The foot clamp will hold B, N or H rods with the standard carbide tipped jaws (no jaw change required). The clamp is held closed by the pressure in a gas charged accumulator, mounted alongside the feed frame. If hydraulic pressure is lost, the rod clamp closes automatically.
The Drill Positioner The drill can be mounted three different ways. For small mines where space is limited the double mine bar mounting system is best. Where there is enough room for unitizing the drill and power pack can be mounted on a single skid that can be moved by fork lift or scoop tram. The drill would then be either pedestal or skid mounted depending on operator preference. Normally the drill is always bolted to the rock face just below the drill hole.
The Hydraulic Power Pack The hydraulic system is simple and uses the highest quality components for maximum efficiency and durability. None of the hydraulic components are used at maximum capacity on a continuous basis, insuring long component life. The power pack has a 75 HP motor driving 3 independent hydraulic pumps. All the pumps suck from a common reservoir through suction strainers. The reservoir is made from aluminum and has a removable lid for easy cleaning. The reservoir also has a oil level gauge, a temperature gauge, and a built in tank top return filter. Two heat exchangers are fitted With 3 independent hydraulic pumps oil can be supplied to the various circuits at 3 different pressures without any circuits having to be back pressured. The two main pumps are load sensing; they put out only the exact amount of pressure and flow required by whatever function is being used. The hydraulic valves arranged so that the normal tasks are easily accomplished. The clamp and chuck are controlled by a single valve making rod pulling easy. Gauges are installed so that drilling torque and bit weight can be estimated. A 20 or 45 GPM water pump can be mounted in the power pack just behind the control panel.
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