Komatsu has released the P&H 77XR surface mining drill rigs, the first of a new line drills offering safer operation, higher productivity and increased maintainability, as well as including semi-autonomous or fully autonomous capabilities.
Designed to work in a wide range of applications, from coal to hard rock mining, the 77XR has a bit loading of 77,000 lb (35,000 kg), and has been designed for maximum versatility, including the ability to carry out rotary tricone drilling or DTH percussive hammer drilling, in single or multi-pass operations.
According to Mark Petersen, Komatsu’s National Product Manager, Mining, the new rig incorporates a number of features that are unique to Komatsu P&H drills, including a new auto bit-changing system and a new boxer-style mast with P&H’s exclusive rack-and-pinion pulldown.
“Auto bit changing is a major step forward for surface mining rigs, and the 77XR is the first rig on the market to offer this. Quite a few manufacturers have tried to achieve this, and we are the first to come up with a solution,” says Mr Petersen.
“Our new bit carousel system eliminates the need to change bits manually, speeding up the entire process and minimising the operator’s handling of bits, reducing the risk of strain or injury.
“It’s a major safety and productivity advance, as it takes operators out of the line of fire, and it allows bit changes to be carried out within five minutes.
“The 77XR’s auto bit changing – in conjunction with other automated features available, including auto rod changing, high-precision GPS hole-to-hole navigation, auto drilling, auto levelling and auto mast raise – are key steps towards fully autonomous drill rig operation,” he said.
“This makes a perfect fit with Komatsu’s industry-leading commitment to autonomous and semi-automated operations across its haul trucks, dozers and excavators.”
Mr Petersen said the new rig’s rack-and-pinion pulldown has been a standard – and exclusive – feature on P&H drills for many years; the only difference to the rest of the P&H Drill product line is the introduction of the boxer style mast.
“The combination of the boxer-style mast and rack-and-pinion pulldown give significant advantages in productivity, reliability, bit-loading performance and maintainability.
The Komatsu boxer-style masts have only four weld joints running the length of the mast compared with the multiple weld-points of conventional lattice-style masts, making it easier to identify any cracks or other issues, and simpler and quicker to repair.
“Again, that strongly aligns with Komatsu’s commitment to ensuring our products have a high degree of maintainability, minimising downtime for service and repairs, and optimising availability and productivity.”
He said P&H’s proven rack-and-pinion carriage system delivers the same amount of retract force as pulldown force, to assist operators in the toughest conditions.
“Our optimised single rack design engages the pinion in tandem to improve reliability and maximise bit-loading performance.”
Other improvements on the 77XR include a new and improved lightweight rotary head, allowing the operator to raise and lower the mast with the carriage in the top position and the complete drill string attached.
“This reduces non-productive pipe handling time and streamlines the process of tramming between patterns,” said Mr Petersen.
“Our redesigned mast and carriage also enable effective single and multi-pass angled drilling.”
To further add to drilling safety and efficiencies, the 77XR can be fitted with P&H’s high-precision automation solution.
“Our auto navigation sensors create a three-dimensional grid that calculates size and distance for obstacle detection and collision mitigation,” said Mr Petersen.
“Once over the hole location, the drill auto-initiates the drilling process and drills to the proper depth, the first time every time.”
Combined with a HawkEye camera system, the drill control system is alerted to any objects or hazards in the drill’s path and can take appropriate action.
“Our P&H drill automation system improves safety and removes variability, leading to increased utilisation and, ultimately, higher drill performance.”
Petersen said the innovations and advances on the new rig helped minimise non-drilling time, translating into up to 12 per cent more drilling, reducing maintenance costs by as much as 10 per cent and increasing productivity by up to 5 per cent.
“With drilling and blasting at the heart of any surface mining process, the more quickly, precisely and efficiently a mine can execute its drill patterns, the more effective the resulting blasts.
“Our aim with the 77XR has been to better protect mine workers and equipment, while further increasing mine productivity,” he said.
Brief specs of the P&H77XR are: Bit loading, 35,000 kg (77,000 lb); bit diameters, 200-270 mm; maximum drill depth, single pass, 16.3 m/multi-pass, 85 m; rotary head power, 158 kW; torque, 14,900 [email protected]; engine, Cummins QST30 rated at 783 kW (6.3 kV electric option available).
*Article published in the July-September 2019 issue of The Asia Miner