Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1989-11-28
1992-11-10
Yeung, James C.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
362 3, 362373, H04N 718
Patent
active
051629062
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to an apparatus for observing the refractories of a furnace or the like, such as a coke oven, blast furnace, metal mixer, melting pot, converter, or vacuum degasifier, with a view to examining them for wear or damage.
2. Description of the Related Art
Generally, the refractory lining of a furnace or the like, such as a coke furnace, blast furnace, metal mixer, melting pot, converter, or vacuum degasifier, is gradually worn away during operation. Hence the necessity for the refractories to be observed to monitor the wear or damage before they become so thin that they can no longer stand operation.
Conventionally, the degree of wear or damage the refractories of a hot furnace have been determined with an apparatus having a camera of a double-water-cooling structure in which cooling air is blown into the camera chamber.
However, in the conventional observing apparatus, equipped with a camera having a double-water-cooling structure in which cooling air is simply blown into the camera chamber, the interior of the camera can suffer damage due to the radiation entering the apparatus and heating it through the glass window thereof when used in a space at a high temperature of 900.degree. C. or more. In addition, the automatic diaphragm of commercial cameras only provides a narrow permissible temperature range of 900.degree. to 1200.degree. C., so that observation cannot be performed to a satisfactory degree.
SUMMARY OF THE INVENTION
This invention has been made with a view to eliminating the above problems experienced with conventional apparatuses. It is accordingly the object of this invention to provide an apparatus for observing the interior of a hot furnace which employs a commercial TV camera capable of remote control of zooming and focusing and in which damage to the camera due to the radiation heat entering through the glass window is avoided, thereby making it possible to conduct observation in a temperature range of from room temperature to 1200.degree. C.
To achieve this object, this invention provides an apparatus for observing the interior of a hot furnace. The apparatus is equipped with a camera arranged in a case whose inner surface is cooled by means of cooling water and into whose inner space cooling air is blown, the apparatus comprising: a quartz-glass plate, a heat-ray-reflecting-glass plate, a heat-ray-absorbing-glass plate, and a heat-ray-transmitting mirror arranged in order of decreasing distance to the camera in an optical path through which a ray of light entering at the front surface of the case is led to the camera; and an illuminating lamp which is provided on the front surface of the case and whose luminance can be remote-controlled.
As stated above, the hot-furnace-interior observing apparatus of this invention, which is equipped with a camera arranged in a case whose inner periphery is cooled by means of cooling water and into whose inner space cooling air is blown, comprises: a quartz-glass plate, a heat-ray-reflecting-glass plate, a heat-ray-absorbing-glass plate, and a heat-ray-transmitting mirror that are arranged in order of decreasing distance to the camera in the optical path through which the ray of light entering at the front surface of the case is led to the camera; and an illuminating lamp which is arranged on the front surface of the case and whose luminance can be remote-controlled. With this construction, the temperature in the case can be kept at 50.degree. C. or less, damage to the camera due to the radiation heat entering through the glass window can be avoided, and the interior of a hot furnace can be observed over a temperature range of room temperature to 1200.degree. C. while remote-controlling the luminance of the illuminating lamp.
BRIEF DESCRIPTION OF THE DRAWINGS
The attached drawing is a diagram showing an embodiment of a hot-furnace-interior observing apparatus in accordance with this invention .
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
An embodiment of this inventio
REFERENCES:
patent: 3114798 (1963-12-01), Jackson
patent: 3718758 (1973-02-01), Ponghis et al.
patent: 4131914 (1978-12-01), Bricmont
Kawano Kazuo
Nonaka Shingo
Yamamura Takashi
Yorita Eiichi
Shinagawa Refractories Co. Ltd.
Yeung James C.
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