DESCRIPTION
The Quantum Leap 80 Rerun Hammer by Atlas Copco is designed for use on drilling machines in conjunction with a top head or kelly drive mounting. The mounting must be capable of supplying sufficient hold down, hold back, rpm, torque, hammer lubrication, air pressure, and air volume.
The Quantum Leap 80 Rerun Hammer achieves high productivity in hard rock applications by adding percussion to the drilling process. Rotary drilling methods use the combination of raw weight and rotation to chip and carve rock from a hole. The rotary method works fine in soft formations where adequate weight and stress can be applied to the rock to initiate fracture and chipping. However, in harder rock the rotary method cannot supply sufficient load on the bit inserts to crack the rock and produce a chip. Percussion drills overcome the rotary bit load limitation by producing a very high load during impact of the hammer. This load is sufficient to drive the cutting inserts into the rock to produce chips.
Quantum Leap® DTH´s are recommended for practically any hard rock application. Depending on the size downhole drill being used, they are suitable for drilling water wells, primary blast holes in quarries, open pit mining, coal stripping operations, oil and gas exploration, and construction jobs where large volume rock excavation is required.
Common DTH´s operate by using the position of a piston to direct supply and exhaust air to and from drive and return volumes. The drive volume ‘’drives’’ the piston toward impact and the return volume ‘’returns’’ the piston in preparation for another impact stroke. In order to maximize impact energy it is desirable to deliver supply pressure to the drive volume while the piston is at the top of its stroke, and, turn off the supply pressure when the piston is nearly at its impacting position.
However, conventional DTH´s which use position dependent fixed porting are not able to alter the position at which supply pressure is delivered and shut off from the drive chamber. As a result, maximum efficiency and power are limited.
The Atlas Copco Quantum Leap® DTH cycle overcomes this inherent limitation by using a poppet valve to maximize efficiency. The poppet valve opens and directs supply air to the drive chamber at the top of the piston stroke and cuts off supply air just before impact. Variable drive volume supply timing is the key difference between the Quantum Leap® cycle and common DTH cycles.
ABOUT ATLAS COPCO
Atlas Copco (Copco from Compagnie Pneumatique Commerciale) is a Swedish industrial company that was founded in 1873. It manufactures industrial tools and equipment.
The Atlas Copco Group is a global industrial group of companies headquartered in Nacka, Sweden. In 2017, global revenues totaled SEK 86 billion, and by the end of that year the company employed about 34,012 people. The company manufactures products at about 100 production sites in more than 20 countries. As of 2016, the United States is the company’s largest single market, followed by China. The firm’s shares are listed on the OMX Stockholm exchange and both ‘A’ and ‘B’ classes form part of the benchmark OMXS30 index.
Atlas Copco companies develop, manufacture, service, and rent industrial tools, air compressors (of which it is the world’s leading producer), construction and assembly systems. The Group operates in four areas: Compressor Technique, Vacuum Technique, Construction Technique and Industrial Technique.
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