Osborn launches new Vertical Shaft Impact Crusher

Vertical shaft impact crushers
Vertical shaft impact crushers

A full range of robust vertical shaft impact crushers has been added to the product offering of Johannesburg-based Osborn. Manufactured in the USA by sister company KPI-JCI, these versatile, low-maintenance vertical shaft impactors (VSIs) have proved their mettle in the USA, Canada and Europe.

With the Government’s planned increase in infrastructure spend in the second half of 2013, Product specialist Shane Beattie believes that the addition of the new VSIs to Osborn’s range means the company is perfectly-placed to reap some of the rewards of the accompanying demand for sand.

“The timing is ideal for these exceptional machines to make their debut in the South African market,” he asserts. “Sand is becoming an increasingly sought-after commodity – with growing demand from manufacturers of bricks, blocks, concrete products and kerb stones, as well as for mineral sands like quartzite and limes. Demand is particularly high in the Eastern Cape at present,” he adds.

Beattie states that a unique feature of KPI-JCI’s vertical shaft impactors is their versatility. The same machine can be configured to run in standard, semi-autogenous and fully autogenous modes. “This is what really sets them apart from other VSI crushers on the market,” he stresses. “Customers can configure their machines according to their needs, to suit their applications. This versatility provides for significant cost savings, since one VSI can effectively be turned into three different machines, with some simple adjustments and changes within the internal components.”

The KPI-JCI VSI crushers deliver highly consistent end products, are available in both stationary and portable configurations and crank out up to 500 tph production output. They are best applied in tertiary and quaternary applications and various secondary applications. Beattie explains their operation: “Rock fed to the crusher’s accelerator mechanism (table or rotor) is flung outwards by centrifugal force against the stationary anvils or hybrid rock shelf for free-body impacting. The proper chamber configuration is application dependent. As a fully autogenous crusher, this VSI features a rotor and hybrid rock shelf. Rock-on-rock crushing occurs with variable reduction ratios between 6:1 and 3:1 achievable. As a semi-autogenous crusher, with rotor and anvil, the crushing chamber has an autogenous rotor and standard stationary anvils for specialised crushing and problem materials. With feed sizes of 38mm to 51mm, reduction ratios between 8:1 and 3:1 are achieved. With a standard configuration, featuring shoe and anvil, with a maximum feed size of 152mm, variable reduction ratios between 10:1 and 3:1 are possible,” he says.

“The major crushing advantages of the KPI-JCI vertical shaft impactor include precise gradation control; the production of chips and asphalt aggregates fines; and compliance with cubical and fracture count specifications for today’s tight specification requirements in asphalt paving.” Beattie goes on to explain that the autogenous configuration of the VSI produces more in spec material in a single pass than that of more conventional compressive crushers. “The autogenous rotor and hybrid rock-self design delivers proper internal crusher geometry for maximum production at the lowest cost,” he notes.

“Whatever configuration a customer opts for, however, they can be assured that the KPI-JCI VSI crusher’s efficient design decreases horsepower requirements. Reversible, replaceable and adjustable wear parts also reduce operating costs”, he adds.

Other noteworthy features of the crushers include feed tube inspection doors and a unique, low-maintenance lubrication system. Beattie elaborates: “The externally adjustable, reversible and replaceable feed tube allows for quick, easy adjustment though the Inspection door located on the top lid for easy access to the impact chamber. Bearing housing on this VSI runs in an oil lubrication system, so there is little to no maintenance on bearings and housing, and no hassle with greasing every eight hours, as required with other machines.”

Safety is also a key element in the KPI-JCI VSI crusher’s design and a hydraulically operated arm, called the “Hydra-Arm”, is available as an option on the machine, to lift and rotate the crusher lid, allowing safe and unobstructed access to the crushing chamber for maintenance. Bolt-on wear liners protect the tub and lid surface, for long service life, and allowing safe and easy maintenance with no welding required.

The addition of these VSI’s to Osborn’s range really rounds off the company’s product line-up, Beattie stresses. “With our full crusher offering – including jaw and cone crushers, vertical and horizontal shaft impactors - we can give customers the best machine for their needs, whatever crusher they require, whether it’s a track, skid or static unit.”

The KPI-JCI VSI crushers, like the rest of Osborn’s range, come with the company’s 24/7 after-sales service, back-up and spares, Beattie says. "We hold spares, to minimise downtime and ensure that our customers can be back in business as quickly as possible.”

Local customers interested in the VSI will also have the benefit of Osborn’s understanding of the South African market and materials, as well as research and development being undertaken here and in the USA at KPI-JCI. Beattie elaborates: “Together with our Astec sister companies, Osborn is undertaking lab tests for prospective customers, to provide them with information on exactly what this machine can do for them. We take client’s material and conduct graded analysis at Astec’s state-of-the-art laboratories, to work out their estimated cost per ton and other rates. Our aim is to help our customers maximise output and reduce costs by giving them the Osborn crushing solution best suited to their needs,” he concludes