Vibrating Grizzly Feeders

Vibrating Grizzly

The vibrating grizzly is used to separate ROM feed material into fractions prior to the primary crushing stage of the process. The pan deck is usually no more that 1 meter long whilst the grizzly bar section can be over 5 meters in length with varying widths from 900mm to 2400mm.

This feeder take a bin load and is often fed by an apron feeder or a pan feeder to feed and scalp the material prior to the primary crusher. Very similar action to the Pan Feeder these robust machines are frequently used in the quarrying and mining industries. The grizzly is generally installed horizontally but to improve material flow they can be installed up to a maximum 10 degree downslope.

Grizzly bars can be arranged as a single, double or even triple row dependent upon the amount of scalping required. Capacities range from 250tph through to 2500tph. The vibrating grizzly can be used as a heavy duty high capacity, non accurate screen due to the grizzly bars being tapered to allow elongated particles to pass through. The Osborn grizzlies operate at a minimum of 4G’s force with an approximate amplitude of 10 mm.

Vibrating Grizzly Feeder

Osborn has a wide selection of VGF’s from the light duty Osborn Obex machines with a vibrator motor drive, a middle duty Osborn Telsmith series with a twin shaft drive (very often used for aggregate production) the heavy duty Osborn Linear series with a twin shaft or quadruple shaft drive and the Osborn Gbex machines with a gearbox drive used extensively for very heavy duty mining applications.

Designed to incorporate a long pan deck and a short section of grizzly bars the VGF is generally used to feed the primary crusher and to take the impact of dumped loads of material from trucks or front end loaders. Often referred to as brute force feeders due to the constant impact loads to which this feeder is subjected which is the main difference between this equipment and the vibrating grizzly Tapered grizzly bars prevent plugging of material and improves separation.

The material load is taken on the pan deck and the grizzly section removes unwanted fines that would otherwise go through the crusher. Available in single or stepped decks configurations with a minimum grizzly length of 1.2 meters up to 3.6 meters. VGF widths are available from 900 mm through to 3000 mm. Also available is a second deck made up of wire screen cloth to provide additional scalping and/or separations in certain sizes.

Types of Drive Mechanism

Twin Motor Type

  • OBEX
  • Double Shaft Type (Linear)

Gearbox Driven

  • GBEX
  • Osborn Double Shaft Type (Telsmith)

BROCHURE: Vibrating Grizzly Feeders