The BT or Flat Bar flight is primarily used for horizontal conveyors and inclined conveyors up to 15° depending on the bulk solids being conveyed.Slippage results in premature wear, and loss of volumetric efficiency (Reduced Capacity). When the velocity of the upper layers of the bulk solid decreases, slippage occurs. If the bulk solid becomes too deep the friction between the sidewalls of the housing and the bulk solid will decrease the velocity of the upper layers of the material relative to the actual chain speed.A square cross-section housing is the most efficient.

FIGURE 1Ī few of the basic principles of En-Masse conveying are: The bulk solid is conveyed by the motion imparted on the bottom surface of the trough by the chain and the shear friction between the particles of the bulk solid material conveyed. The Efficiency of En-Masse Drag Chain ConveyingĮn-Masse Drag conveying works by pulling a single strand of endless chain centered in an enclosed housing with flights attached on both sides of the chain (skeletal looking) through a rectangular section of bulk solid material. (Horizontal, Inclined, or Vertical.)įull tall flights also produce excessive chain weight that requires more horsepower to merely move the chain, and increased trough wear, rather than concentrating on the amount of product to be moved. The capacity capabilities of each drag chain conveyor type are determined by their flight design, cross-sectional area available, chain speed, commodity characteristics, and the direction of flow from point A to point B. While this is effective, it eliminates the available cross-sectional area within the enclosed trough to around 50% of the physical area of the conveyor. The scraper/paddle style chain conveyors work on the physical push/pull principles of moving a product at the height of a tall full flight. The difference relates to how this is accomplished. The word “Drag” relates to all styles scraper, paddle or en-masse because each type of conveyance moves the chain and product forward to the discharge. While each individual type functions somewhat differently, their purpose is to accelerate and move a bulk commodity from inlet to discharge at a specific rate.

Drag Chain Conveyor Operation Understanding the Functional Differences Between Drag Conveyor and En-Masse Drag Conveyor INTRODUCTIONĬhain conveyors whether known as Drags, Scraper, Paddle, or En-Masse all start out with a continuous chain and fixed flights operating within an enclosed trough.

Principle app drag begin