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Largest Rockbreaking Boom in Australia
Australia and possibly the world's largest Rock Breaking boom has recently been installed in Western Australia. The mammoth Transmin model XXHD 100/70 Rockbreaker is powered by a in-house designed 150kW hydraulic power pack, has 10m boom centres, 7m jib centres and weighs around 30t. The business end comprises of a Rammer model G100 hydraulic hammer, which in itself weighs nearly 4t and delivers an impact energy of 9000 Joules.
The complete machine was fully assembled and test run at Transmin's works prior to delivery. This exercise alone required the fabrication of a special test frame, weighing approximately 20t, which has been cast into the ground at Transmin's manufacturing facility. The purpose built test frame allows for the comparison of calculated loads with actual loads, assisting in boom development. The test frame also allows Transmin to provide the option of full load testing of equipment for clients if required.
To make such a large machine practical, the XXHD model required innovative design in both the boom construction and the hydraulics required to manipulate it.
The XXHD Rockbreaker boom was completely designed from the ground up to be suitable for applications over the biggest available gyratory crushers and dump pockets in the world. Building on the successful XHD Rockbreaker designs implemented at Freeport and Nusa Tengarra mine sites in Indonesia, a finite element analysis computer package was used to allow Transmin to be able to identify and engineer out possible high stress and fatigue areas in the XXHD Rockbreaker boom assembly. High tensile steels and specialised welding techniques were used in the construction of the Rockbreaker boom, allowing a considerable weight reduction and strength increase to be achieved.
The hydraulics used to manipulate the Rockbreaker boom was designed completely in house by Transmin. It is powered by a high pressure piston pump and uses a combination of Transmin designed 8" and 9" cylinders and twin pinion slew drives to provide quick and accurate positioning of the hydraulic hammer, with scope for simple setting changes to increase speed if required.
The result of the work described above has proved yet again Transmin's ability to consistently design and produce the biggest, most rugged machines on the market in the world, able to cope with the unpredictable high loads resulting from manipulating and breaking down oversize rocks. |
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