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Title:
HEATING MALFUNCTION DETECTION DEVICE AND ELECTRIC HEATING SYSTEM
Document Type and Number:
Japanese Patent JP2013187072
Kind Code:
A
Abstract:

To reduce the whole man hours necessary to check the defect of a work by detecting, with a few man hours, the occurrence of sparks and overheating that can be generated when the work is electrically heated.

A total of four optical sensors 10-13 are installed around contact parts between a work W and respective electrodes 3a-3d, and they detect luminance from the vicinity of the contact parts. The luminance detected by each sensor 10-13 is input into an electric conduction spark detection device 6. The electric conduction spark detection device 6 obtains luminance (background luminance) before electric conduction heating start on the basis of detection signals of the respective optical sensors 10-13 before electric conduction heating by electric conduction from a power supply for heating 2 to the work W is started. The electric conduction spark detection device compares luminance after the electric conduction heating start (luminance at the time of heating) to the background luminance per optical sensor 10-13, and determines that a spark has occurred if the situation is an excess luminance state in which the difference between them is larger than a luminance increment threshold value.


Inventors:
ITO TORU
Application Number:
JP2012000051985
Publication Date:
September 19, 2013
Filing Date:
March 08, 2012
Export Citation:
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Assignee:
CHUO HATSUJO KK
International Classes:
H05B3/00; C21D1/09; C21D1/40; F27D11/04; F27D21/00
Domestic Patent References:
JPH05315051A1993-11-26
JP2009127922A2009-06-11
JPS62223633A1987-10-01
JPH01165595U1989-11-20
Attorney, Agent or Firm:
名古屋国際特許業務法人