Tubular Drag Conveyors (TDCs) are mechanically driven conveyors that 'drag' material along the inside of a totally enclosed tube. They are designed to transfer a wide variety of bulk materials from a single or multiple in-feed points to a single or multiple discharge points through various configurations of totally enclosed tubing. TDCs use close-running discs connected by a cable or various styles of chain. They have been used successfully throughout a range of industries for over fifty years.
A continuous loop of cable or chain with discs spaced along its length is pulled by a motor driven sprocket within an enclosed tube. Changes in direction are facilitated by bends in the tubing or by corner housings with drive or idler sprockets for tighter radii. Discharge of the product is through either tube outlets or housing outlet boxes. Cable or chain and casing are routed back to the in-feed point in an endless loop.
By nature, a tubular drag conveyor absorbs all the reactions to its own conveying forces internally. The forces are transferred by compression of the flanged casing sections in the Dynaflow and Chainflow chain drag conveyors and by compression couplings in the Cableflow cable drag conveyor. As a result, the only external supports required are those necessary to support the weight of the conveyor and load of material being conveyed. The process of designing and installing supports for a TDC is identical to hanging pipe/tubing. Spiroflow engineers can recommend support locations.
Generally, the construction materials of a tubular conveyor are determined by the application and the product being handled. Materials that are corrosive or contaminable would normally dictate stainless steel construction on metallic material contact surfaces. In applications where corrosion or contamination is not a concern, carbon steel construction is a far more economical alternative. The most common materials of construction, in order of increasing costs, are carbon steel, 304 stainless steel, and 316 stainless steel. External components not in contact with the product are carbon steel unless specified otherwise. Other materials of construction can be quoted upon request.
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