JPS56166339A - Auxiliary material hopper for vacuum degassing device - Google Patents

Abstract

PURPOSE: To improve the cutting accuracy of auxiliary materials by correcting the auxiliary material weighing value by the weighing machine of a hopper body by the numerical value obtained from the product of the difference between the internal and external pressures of the hopper and the sectional area of a joint member.

CONSTITUTION: The inside diameter area S of a joint member 19 and the atmospheric pressure difference P between the internal atmospheric pressure P₂ and external atmospheric pressure P₀ of a vacuum hopper body 11 are inputted to an operator 20, by which a weight correcting value PXS is obtained. The weighing value W₂ at the dispensing of auxiliary materials with a weighing machine 16 is inputted to the 20. An atmospheric pressure correcting weight value w₂=W₂-PXS is displayed by these values. Further, the difference between the atmospheric pressure correcting weight value w₁ prior to dispensing of auxiliary materials having beforehand been stored and the atmospheric correcting weight value w₂ at the dispensing is displayed as a net dispensing amount. Thereupon, the dispensing amount w₀ is set and according to the net dispensing amount w₁-w₂, the weight value w₂ at the dispensing is deducted from the weight value w₁ prior to dispensing of the auxiliary materials in the body 11, and the balance is commanded to a rotary feeder 18, whereby the dispensing of a required amount is accomplished. When the dispensing amount w₁-w₂ equals to the set dispensing amount w₀, a stop command is given, thereby ending the dispensing.

COPYRIGHT: (C)1981,JPO&Japio