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Impact crusher’s improved performance

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article image Barmac crusher -- competitive edge.

METSO Minerals has developed a new vertical shaft impact (VSI) crusher aimed at aggregate producers who are looking for a competitive edge.

The Barmac B7150SE VSI crusher incorporates all the features of the standard range and adds a number of new ones to provide even better performance, reliability and serviceability.

Suitable for processing almost any competent, abrasive, friable or sticky material, the single drive crushing and grinding unit has a maximum throughput capacity of 260-490tph for general crushing duties. Maximum feed size is 66mm.

Revised geometry in the crushing chamber has improved crushing performance and the retention of build-up. As a result the crusher body is less likely to be damaged by material falling from the chamber.

A re-designed, more durable mechanism for the chamber inspection door makes it easier to access the rotor for inspecting wear parts.

The roof lifter is now a standard option that can be retrofitted at a later date. Operated by one person, it provides quick and easy access for rapid replacement of the rotor and wear parts.

When used in conjunction with a Barmac Service Boom, the roof lifter allows for the removal and replacement of rotors without a crane or other lifting equipment.

Service technicians can access the rotors in less than two minutes after the machine stops running, ensuring maintenance downtime and costs are kept to a minimum.

Improvements to the feed hopper components further enhance the performance of the Barmac's unique cascade feed system, which introduces a second stream of material into the crushing chamber.

In combination with other variables such as rotor diameter, speed and crushing chamber profile, the cascade system enhances power efficiency, reduces wear and provides an efficient means of controlling the grinding and crushing action to either maximise or minimise fines and product shape.

Cable ducting facilities are incorporated into the crusher body of the Barmac B7150SE to facilitate the wiring of the VSI operational control system (VOCS) crusher protection and monitoring system.

The VOCS provides the operator with constantly updated information on the operating condition of vital mechanical components. VOCS is a standard option.

A more robust motor mount and transmission structure allows the B7150SE to support motors rated up to 300kW (400hp). This enables the use of high voltage equipment and higher power, low voltage equipment, without sacrificing drive design or V-belt life.

For particularly tough applications a new-style laminated rotor tip option is available. Laminated tips use the properties of different tungsten grades to increase impact and abrasion resistance. Tips can be tailored to suit various applications.

The high velocity impact crushing improves soundness and shape of stone, reduces product moisture and eases the screening task while producing superior products at a minimum cost.

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