Showing papers on "Material flow published in 1969"

System for maintaining constant the dry material flow to a sheet material manufacturing machine

Abstract: The stockline valve of a paper making machine is regulated by comparing by means of a digital computer successive readings of the consistency of the paper pulp carried by a water carrier. Any resultant difference between such readings is converted to analog information and coupled to the set point of an analog flow control unit which is responsive to the actual flow rate to control the stock valve. The digital computer will perform changes of the flow controller set point in such a manner that the product of consistency and flow set point is constant. This provides control of the pulp flow in the line.

Measurement of rate of material flow

Abstract: 1,161,973. Measuring rate of flow. F. L.SMIDTH & CO. A/S. April 9, 1968, No.16980/68. Heading G1A. [Also in Division G3j The weight per unit time of moving bulk material is measured by allowing the material to fall freely through a vertical shaft 7 and measuring the absorption by the falling material of radiation from a radio-active source 8 using a detector 9. In the arrangement shown, the cross-section of the material measured is chosen so that the absorption is a logarithmic function of the flow-rate. The detector output is fed to a regulator unit 10 which operates on drive 6 to control the speed of the conveyer 3, feeding material to the shaft, so that the amount of material supplied per unit time is either constant or varying according to a predetermined programme. Alternatively, the flow to the conveyer 3 from silo 1 is controlled by the regulator operating on slide gate 2.