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Hopper Controls for Fluidic Materials

IP.com Disclosure Number: IPCOM000086639D
Original Publication Date: 1976-Oct-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Iwata, PG: AUTHOR [+3]

Abstract

A factory control computer automatically maintains fluidible material level in the supply hopper. Fluidible material is generally characterized as being granular.

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Hopper Controls for Fluidic Materials

A factory control computer automatically maintains fluidible material level in the supply hopper. Fluidible material is generally characterized as being granular.

The fluidible material is stored in a raw-material bin and fed through a feed line to a feed hopper under control of a vacuum. A vacuum source is timed on and off by the factory control computer, such that the fluidible material flows from the bin into the feed hopper. The vacuum line pulls air through the raw material bin to fluidize the material in the feed line for moving it to the feed hopper. A valve in the lower end of the drop line, but within the confines of the supply hopper, seals the drop line to prevent air from flowing from the supply hopper to the feed hopper.

After a predetermined time, the factory control computer actuates the vacuum source to stop drawing a vacuum. At this time, the fluidible material in the feed hopper drops through the drop line and the valve into the supply hopper. Depending upon the vibratory nature of the supply hopper and the granularity and surface tension properties of the material, the supply hopper is full when point "x" is reached, with the full lines representing the angle of repose for given fluidible material.

Switch S1 detects a full supply hopper. When the computer turns the vacuum source off, the weight of the material in the drop line overcomes the weight of the counterbalance on the valve, thereby opening the valv...