Feeders

For heavy-duty feeding, Osborn offers a range of apron feeders suitable for the most arduous conditions encountered in the mining and quarrying industries. The company’s apron feeders handle heavy, lumpy and abrasive materials with accurate feed rate control.

Osborn also designs and manufactures a complete range of vibrating feeders including the Osborn Linear Grizzly & Pan Feeder, the Osborn Obex Feeder and the Osborn Apron Feeder.

Osborn Apron Feeder

Our Apron Feeders are designed and built in a wide range of sizes from 900 mm to 3500 mm wide to handle heavy, lumpy and abrasive materials, and provide a reliable means of controlling the feed rate to prevent surge loads to primary crushers, belt conveyors and other plant and equipment.

Apron Feeders are usually installed under a hopper or bin and can accept direct dumping by trucks or bulldozers, shovels or a dragline.

Osborn offers a complete range of standard and extra heavy duty apron feeders suited for the most arduous conditions encountered in the Mining and Quarrying industries. Feeders can be supplied in lengths to suit customers' requirements.

With one of the largest and most modern facilities in South Africa, Osborn also offers installation, commissioning, spares, reconditioning and after-sales service, plus the capability to supply the right unit for any type of inquiry.

In addition, these units complement Osborn's wide range of mills, screens, jaw crushers, gyrasphere cone crushers, feeders, scrubbers and idlers. A turnkey plant capability is also available.

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Pan Feeders

Osborn Pan Feeders (Volumetric Feeders)

The main feature of this feeder is the low power consumption, low noise and little maintenance required. Osborn Pan Feeders are generally installed at a 10 degree downslope to provide the best efficiency for the free flow of material. Fitted with replaceable liners and can be floor or suspension mounted.

Skirt boards should be fitted to give an approximate clearance of 30 mm minimum between the deck and the side plates when operating with 4 pole motors and 60 mm for feeders with 6 pole motors. These recommended clearances are measured at the feed end of the deck and will increase to approximately double at the discharge end.

Of significant importance when installing an Osborn Pan Feeder is the design of the feed hopper. (see hopper /chute design). Incorrect hopper design will cause the feeder to underperform to the specified duties. Osborn Pan Feeders are manufactured in many different widths and lengths from 300 mm wide up to a 2400 mm wide and up to 4000 mm long.

Osborn feeders all work on the same principle, that being the extraction of materials from under crushers, bins, hoppers etc, or fed by a conveyor with a regulated flow to promote a steady supply to maximise production in the processing plant.

Sometimes fed by a dump truck or a front end loader, or directly from under a stockpile. Whatever type of feed is required and dependent upon the type of the feeder installed, the feed rate is controlled by the machines vibration frequency and often the controls, which can be manual or automatic and can be programmed to receive a signal from a PLC.

Types of Drive Mechanism

  • Twin Motor Type (OBEX)
  • Double Shaft Type (Linear)
  • Gearbox Driven (GBEX)


Osborn Spreader Feeder

Designed to accept a fast material flow from a relatively narrow feed and convert this into a low velocity and uniform flow across the width of the machine. The Osborn spreader feeder is highly recommended for this.
These feeders are capable of handling a wide range of products including materials such as damp clay and limestone and are ruggedly built for arduous trouble free service. There are two types of Osborn spreader feeders.

These are:

  • Transverse Feeder
  • Central Feeder

 

Reciprocating Plate Feeder (Push-pull Feeder)

The reciprocating plate feeder is generally installed at a primary crushing site and receives a positive feed of material from a bin or hopper. Its “push-pull” action is generated by a link arm that is connected to a crank shaft which is in turn connected to a variable or fixed speed drive unit .

Plate feeders generally operate at low frequencies. Often used in the drawdown of a coal stockpile where large lumps and moisture in the coal is being handled as the flow characteristics of coal are perfect for a reciprocating plate feeder. The hopper or bin cannot be emptied by the plate feeder and feeding is discontinuous thus ensuring a cushion of material on the plate to protect the feeder. The feeding of the material takes place in the return stroke only due to the reciprocating action.

The main advantages of a plate feeder over other feeding equipment are:

  • Minimum damage from impact of large lumps due to cushion of material on the plates
  • With no carry-back of material, plate feeders operate with minimum spillage
  • Wedging damage is minimal
  • Low maintenance and operating costs
     
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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

 

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