Bulk materials systems - Import export

Grizzly screens are typically constructed by welding steel rails, rods, or bars into grids with a specific pattern. The selection of rails can vary in size, ranging from about 7.4 kg/m to approximately 225 kg/m. These rails generally run parallel to each other along the entire length of the screening surface. The spacing between the rails typically range from 5 to 200 mm. To facilitate the smooth flow of materials, the openings are often tapered, with the top being wider than the bottom. Heavy-duty grizzly bars are commonly cast from manganese steel and feature double tapers. These grizzly screens are designed to receive large lumps of ore from sources such as railroad wagons, tipper cars, and other bulk material handling systems that discharge materials from considerable heights. As a result, they are constructed to be exceptionally robust to withstand the impact and handling of heavy materials.

An apron feeder is a crane, hardwearing, specialized bulk material handling machine found in the industries mentioned above. Apron feeders contain series of overlapping heavy steel pans or plates that are mounted upon high-powered chains. The chains pull the material along the feeder, therefore conveying the material from one point to the other. Apron Feeders are designed for a wide variety of materials, from large rocks down to ores and other very abrasive materials that may prove problematic for other feeder types. The difference in an apron feeder from the other types of feeders can be seen in its well-built design and the capability to endure heavy impact, besides intense abrasion, typically experienced in heavy industrial applications. They run at a regulated speed, delivering a constant flow of material to the downstream process equipment such as crushers, screens, and conveyors—important for ensuring that the overall processing system operates at optimum efficiency and producti