Showing papers on "Material flow published in 1973"

Flow gate for a fluidizing gravity conveyor

Abstract: A flow gate which is in the general form of a rectangular butterfly gate for use with a fluidizing gravity conveyor for granular particulate material such as cement or alumina. The flow control apparatus includes an open body having a wall dividing the body into upper and lower flow paths. The upper flow path is contiguous with the material chamber of the conveyor and the lower flow path is contiguous with the air plenum of the conveyor. A butterfly gate is mounted in the upper flow path for rotation about an axis parallel to the wall means and spaced between the wall means and the top of the body. A motor or manual means is provided for rotating the butterfly between a position which permits material to flow through the conveyor and a position which prevents such material flow. The butterfly gate is generally rectangular to conform to the shape of the conveyor.

Apparatus for cooling solid particulate material

Abstract: Apparatus for cooling solid particulate material treated in a kiln comprising a plurality of elongated cylinders attached to the periphery of a rotary kiln. Particulate material is discharged from the kiln into the material inlet of the cooler while cooling air is introduced into the cooler countercurrent to the material flow. The particulate material is uniformly advanced from the material inlet to the outlet by means of a helical plate means which is continuous throughout its length. Annularly offset openings in the plate means deflect the cooling air from its initial flow path in order to increase the rate of heat transfer between the cooling gas and the particulate material, plate means and walls of the cooler. The plate means is easily manufactured and installed. The plate means is designed to prevent clogging by the particulate material. The interior of the cooler and the entire plate means are easily accessible for maintenance or repair by means of access doors near the material inlet and outlet. Spent gas is returned to the kiln to be used as preheated air of combustion.

Nucleonic conveyor weighing

Abstract: With the increasing use of conveyors for handling bulk materials such as ores, coal, coke, limestone, fertilizers, cement, sand and gravel, there is a need for methods of continuously monitoring feed rates both for production control and for inventory purposes. A weigh hopper is accurate and easily calibrated but necessitates an interruption in the material flow, and the installation is expensive and bulky as it involves storage bunkers and materials handling equipment.