Evolution of a home-grown product

Built and designed in Australia by Precision Screen?s R&D team, this machine has been a success in the aggregate making process throughout Australia. The Precision Screen Track Crush VSI is now working in some of the harshest conditions to produce some of the best shaped stone around.

Precision Screen has been operating in the quarrying industry for 24 years, with a senior management team that has over 50 years of combined experience in the industry. Precision Screen has grown to become a renowned supplier of crushing and screening equipment and is also the Australian distributor for Sandvik Mining and Construction?s medium mobile range of crushing and screening equipment. Precision Screen has enjoyed great success with its current range of machines but is always looking to meet and exceed the growing expectations of its clients.

One such area of need has been in the production of materials that meets the ever-increasing expectation for better rock. Stage 4 crushing in aggregate manufacturing is becoming more and more important and the key to a top quality product. ?With such a large volume of mobile crushers and screens in the marketplace, it seemed like a matter of time before the push for increasing flexibility provided by a track range opened an opportunity for a mobile VSI,? said Precision Screen?s managing director Harold Kerr. ?This is how the Precision Screen Track Crush VSI crusher came about.?

Precision Screen first began developing its own tracked VSI crusher, utilising the Barmac (8100) crushing chamber, in 2001. Back then, the demand for this type of machine was still quite low but Harold Kerr and his team saw the potential for a high production rock shaping aggregate crusher. This first unit had some very unique features, making it stand out ahead of its time. This machine was the first in the market to contain all of the following features collectively:
? A mobile VSI on tracks.
? A tracked VSI to produce 250 tph consistently.
? A machine that can walk at a workable speed 2.5kW proportional control.
? A hydraulically driven VSI.
? Hydraulic levelling tracks with walking beam style.
? An adjustable discharge height on the tail conveyor to suit other machines in circuit and lowers to 900mm for servicing.
? An ample capacity to allow the engine to run at 1730 rpm (for best fuel economy at full horsepower) while the crusher runs at up to 1800 rpm.

The self-levelling feature has proven to be an invaluable part of the Track Crush VSI as the machine can be positioned level anywhere on the quarry floor, ensuring level flow of materials at all times. Additionally, it saves the operator time and money as there is no need to produce a pad for operation. It also helps eliminate any unwanted stress in the chassis. Some seven years after its development, Precision Screen still carries this as a main feature. From this earlier model, the machine has evolved into a world class mobile VSI, using the latest crushing technology.

A lot has been learned from the earlier models and each one has been improved upon to the stage that the machine is at today. Such improvements included greater horsepower and available hydraulic power, along with new crushing chambers that better complement mobile machines. The outcome today is a 300 tph machine with maximum fuel efficiency and power using the best technology in the market.

Precision Screen has recently launched the first track crush machine to feature the Sandvik Merlin VSI (CV118). Previously, it has used the Barmac and other crushing chambers, but has moved to the latest Sandvik Merlin VSI as it offers enhanced features. Utilising the hurricane rotor in the CV118 VSI chamber, coupled with 350kW of hydraulic power, this crusher is sure to remain unrivalled for some time.

Precision Screen has worked closely with its customers to design and manufacture a high quality, market-leading machine that effectively meets the customer?s needs. A recent case study using the Track Crush VSI uncovered the following results:
? A feed material of minus 26mm basalt rock going to Track Crush VSI for final aggregate shaping.
? The tonnage rate varied from 250 to 300 tph through the rotor using no cascade.
? Fuel consumption ranged from 42 to 50 litres per hour, improving fuel efficiency.
? The unit was the most consistent performer on-site with the most uptime.
Given these encouraging results, the Precision Screen Track Crush VSI is feasible for the serious high end operator wishing to ensure that their product meets certified specifications.

Source: Precision Screen

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