Metallurgical Content • • • • Apron Feeders must always be employed to ensure that the feed to a crushing machine is drawn at a constant rate from the bin which serves it. Of the many designs in existence by far the most widely used are the apron and pan feeders, although the Ross Chain Feeder is coming into favour for handling coarse ore.

Aggregate production plants have components such as feeders and scalping units to direct material to be crushed, separated, or stored for later use. Feeders are used mainly to handle input material for the plant. They are of two types: the apron feeders and mechanical, or reciprocating-plate, feeders. Or grizzlies are generally used to feed quarry rock into a primary crusher. They are of a heavy-duty construction to take the shock from rocks dumped directly on them.

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To cushion the blow of material dumped on the feeder, a large hopper may be used to receive the dumped loads. The apron feeder consists of a series of overlapping pans or plates which form a continuous chain like a conveyor belt. They are generally installed on a slight decline and driven to throw material in the downward direction. Widths of feeders range from one to 15 ft and lengths vary from one (for the largest) to five times their width. Feeders are driven by less than one horsepower up to 40-hp motors, depending on feeder size and expected load. The main point to consider in selecting a feeder is that it must provide an even flow of material to the primary crusher.

The size of the feeder and its speed should provide a capacity 25-35% greater than the capacity of the crusher. It may be necessary to provide for hand Controls to regulate the feeder in the case of irregular dumping of the raw material. Apron Feeders The Industrial Apron Feeder is the ‘best of breed feeder’. Earlier I made a statement that feeders are stationary while the rock moves. There is a saying that there is an exception for every rule and this could be classed as that exception. An apron feeder is in fact a conveyor that is constructed from metal.

It regulates the feed by carrying the ore to the delivery point at a controlled rate of speed. The face of the conveyor is made from heavy armour plating, and works like the track on a crawler type tractor.

Due to this type of construction it is able to withstand high impact from large ore. This, coupled to the fact that the feeder can have a very large entrance opening, makes it a good choice to he put under stockpiles and equipment where the ore may have a long fall before it enters the feeder. While the conveyor portion of the Apron feeder doesn’t have a high wear factor from abrasion, the sides, entry and exit points still do. Earobics Installation. These will have to be maintained. Another problem associated with this type of feeder is that it doesn’t handle very fine material well. C Programming Software For Windows 7 on this page. Dust will require special consideration in the design of the equipment, possibly a dust chute prior to the feeder or an easily accessible clean up area to handle spillage as it occurs.