A scraper conveyor uses a driven chain loop with crossbars to move coarse materials short distances, up moderate grades, or even underwater. It is cost-effective and reliable, making it an ideal alternative to belt conveyors for heavy and irregularly shaped objects.
A scraper conveyor is a material conveying device using a continuous, driven chain loop equipped with regularly spaced crossbars. The chain travels through a trough or trough which prevents the conveyed materials from falling off the conveyor as the cross beams drag or “scrape” them forward to the discharge point. Scraper conveyors are generally used for coarse and heavy materials such as raw coal, iron ore, molten metal parts and scrap metal. The design is ideal for slower transport speeds over short distances, on moderate gradients or even in submerged applications. This type of conveyor is typically more cost effective to install and maintain than a belt conveyor of similar capacity and length.
Most industrial processes require the constant transport of raw materials, finished items or by-products from one point to another. The conveyor, in all its many forms, is probably one of the most commonly used methods of moving materials in manufacturing and production environments. The scraper conveyor is one such conveyor and sees extensive use in these industries as a low-cost, efficient method of moving coarse, non-abrasive materials. These systems are ideal for moving large, heavy objects or aggregates over fairly short distances, up moderate grades, or even underwater. They are relatively inexpensive to install and maintain and are reliable under a wide range of conditions.
A scraper conveyor has, internally, a continuous flexible chain or set of chains typically driven by an electric motor equipped with sprockets. A single chain arrangement runs down the center of the conveyor; double-chain setups feature chains running up either side. This chain is equipped at regular intervals with scrapers which protrude on both sides of a single chain or are supported on both ends by double chains. These scrapers travel with the chain scraper material on the conveyor forward to the discharge end. The return path of the chain can be above or below the conveyor depending on the specific configuration.
The chain or chains run within a partially enclosed channel or channel which forms a contained path for the conveyed material and prevents it from escaping. These conveyors can also be used in submerged configurations such as the ash removal systems on coal-fired generators. The scraper conveyor is an ideal and low cost alternative to other conveying systems such as belt conveyors due to its competitive cost and ease of maintenance. Scraper conveyor systems are also less prone to damage when transporting heavy and irregularly shaped objects such as foundry castings and scrap metal.
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