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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