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Walking beam furnace provided with an apparatus for detecting the position of a material by the use of gamma rays

Patent:

Abstract

A material fed to the vicinity of an extraction port of a walking beam furnace is extracted by the arm of an extractor which is disposed outside the furnace and inserted into the furnace such that the material is placed on the arm. In order that the position of the material in the furnace immediately before the extraction may assume its predetermined condition, it is necessary to measure the material position with the detecting apparatus and to conduct precise positioning. Modulated light has been generally utilized for the measurement. In the prior art, the light is prone to be intercepted by atomized oil or on account of the incomplete combustion of fuel gas, and detector malfunctions often occur. This invention utilizes gamma rays, and measures the material position on the basis of the product between the density and thickness of the object to be detected. When the gamma rays are directed from the ceiling of the furnace perpendicularly towards the hearth, it is difficult to distinguish the material from scale which exfoliates from the material and which deposits on the hearth. When the gamma rays are directed horizontally from the side wall of the furnace, the accurate position of the  More>>
Authors:
Publication Date:
May 27, 1970
Product Type:
Patent
Report Number:
JP 1973-38043; B
Reference Number:
EDB-76-043155
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; DISPLACEMENT GAGES; DESIGN; FURNACES; GAMMA RADIATION; MATERIALS HANDLING; RADIOMETRIC GAGES; TRANSPORT; ELECTROMAGNETIC RADIATION; IONIZING RADIATIONS; MEASURING INSTRUMENTS; RADIATIONS; 440105* - Radiation Instrumentation- Radiometric Instruments- (-1987)
OSTI ID:
7286435
Country of Origin:
Japan
Language:
Japanese
Submitting Site:
INIS
Size:
Pages: 3
Announcement Date:

Patent:

Citation Formats

Tomita, F. Walking beam furnace provided with an apparatus for detecting the position of a material by the use of gamma rays. Japan: N. p., 1970. Web.
Tomita, F. Walking beam furnace provided with an apparatus for detecting the position of a material by the use of gamma rays. Japan.
Tomita, F. 1970. "Walking beam furnace provided with an apparatus for detecting the position of a material by the use of gamma rays." Japan.
@misc{etde_7286435,
title = {Walking beam furnace provided with an apparatus for detecting the position of a material by the use of gamma rays}
author = {Tomita, F}
abstractNote = {A material fed to the vicinity of an extraction port of a walking beam furnace is extracted by the arm of an extractor which is disposed outside the furnace and inserted into the furnace such that the material is placed on the arm. In order that the position of the material in the furnace immediately before the extraction may assume its predetermined condition, it is necessary to measure the material position with the detecting apparatus and to conduct precise positioning. Modulated light has been generally utilized for the measurement. In the prior art, the light is prone to be intercepted by atomized oil or on account of the incomplete combustion of fuel gas, and detector malfunctions often occur. This invention utilizes gamma rays, and measures the material position on the basis of the product between the density and thickness of the object to be detected. When the gamma rays are directed from the ceiling of the furnace perpendicularly towards the hearth, it is difficult to distinguish the material from scale which exfoliates from the material and which deposits on the hearth. When the gamma rays are directed horizontally from the side wall of the furnace, the accurate position of the material cannot be detected when the material is conveyed in the furnace in an inclined state. According to this invention, therefore, a gamma ray source is provided near the end of the ceiling wall of the furnace in the direction of the width, while a detector is provided near the lowermost part of the opposite side wall, so that the gamma rays are directed obliquely across the path of the material.}
place = {Japan}
year = {1970}
month = {May}
}