JPH05141878A - Observation device for inside of furnace equipped with filter - Google Patents

Abstract

PURPOSE:To obtain an observation device for the inside of furnace equipped with a filter wherein it is made further compact and handling performance thereof is improved and wherein the device equipped with a filter is insertable into the furnace even through a small device insertion hole. CONSTITUTION:An inside-furnace observation device 50 comprises a cooling box 1 including an observation window 4 provided in the inside thereof, a reflector 5 contained in the cooling box 1 and directed toward the observation window 4, and observation means 6 for photographying an image in the furnace reflected on the reflector 5. An optical filter 7 is disposed between the observation means 6 and the reflector 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-furnace observing device with a filter for observing changes in wall surfaces and various substances inside the furnace in a hot state.

[0002]

2. Description of the Related Art The lining of refractory bricks, etc., applied to the inside of the iron skin of a blast furnace, etc., gradually wears down during operation, and it is necessary to repair it at an appropriate time. In order to judge the degree of wear of the lining of this blast furnace and to judge whether repair is necessary, the most reliable means is to directly observe the condition inside the high temperature furnace during operation.

For this reason, conventionally, there has been used an in-furnace observing device which has an observing means such as a television camera or a fiberscope and can directly observe the state in the blast furnace during operation.

For example, in Japanese Patent Laid-Open No. Sho 58-206681, a fiberscope is provided which is provided with a reflector such as a mirror or a prism so as to point to a peep window provided on the side surface of the apparatus and which picks up an image reflected on the reflector. An in-furnace observing device having a built-in is described. Further, in this apparatus, an optical filter is arranged on the optical axis of the observing means so that harmful rays such as infrared rays and ultraviolet rays emitted from the inside of the high temperature furnace to the camera are cut off.

Further, in JP-A-61-114085, a furnace observation window provided with a quartz glass assembly having excellent heat resistance is provided on the side of a cooling box, and a television camera is provided inside the box. And an in-furnace observing device having a prism for projecting an image of the inside of the furnace through the in-furnace observation window in the television camera.

[0006]

In such an in-furnace observing apparatus, in order to improve the handling property in the furnace and to make the apparatus insertion hole provided in the furnace wall as small as possible, the product is made compact. In particular, there is a strong demand for reducing the cross section.

However, in the former in-furnace observing device, the optical filter for protecting the observing means is arranged in parallel with the protective glass of the observing window on the side of the cooling box, so that the entire device has a large diameter. This is an impediment to downsizing of the device.

Further, in the latter observation device, since the observation means weak to heat and the reflector relatively strong to heat are integrally incorporated in the cooling box of the observation device, the entire cooling box is exposed to heat. It is necessary to cool to a temperature suitable for weak observation means. Therefore, the cooling means for cooling this is also large and complicated.

As described above, the conventional apparatus does not fully meet the demand for product compactness, and therefore the handling performance is poor and the apparatus insertion hole provided in the furnace wall must be large.

The present invention solves the above-mentioned problems in the in-furnace observation device, enables the observation device to be made more compact, improves the handling performance of the in-reactor observation device, and allows a smaller device insertion hole. Another object of the present invention is to provide a furnace observation device with a filter that can be inserted into the furnace.

[0011]

In order to achieve the above-mentioned object, the in-furnace observation apparatus with a filter of the present invention has a cooling box provided with an observation window on its side surface, and a cooling box built in the cooling box and directed to the observation window. In the in-furnace observing apparatus including the reflector and the observing means for capturing an image of the in-furnace image reflected on the reflecting body, an optical filter is arranged between the observing means and the reflector.

Further, the inside of the furnace provided with a cooling box having an observation window on its side surface, a reflector built in the cooling box and pointing to the observation window, and an observation means for taking an image of the inside of the furnace reflected on the reflector. In the observing device, the reflector and the observing means are partitioned by an optical filter assembly to form a reflector accommodating chamber and an observing means accommodating chamber, and a cold air introducing pipe is connected to the observing means accommodating chamber. At the same time, the optical filter assembly is provided with a cool air passage for taking in cool air in the observation means storage chamber into the reflector storage chamber.

Further, the inside of the furnace provided with a cooling box having an observation window on its side surface, a reflector built in the cooling box and pointing to the observation window, and an observation means for taking an image of the inside of the furnace reflected on the reflector. In the observation device, an optical filter is arranged between the observation means and the reflector, and a cooling gas guide for guiding cold air is provided in the optical filter.

[0014]

In the present invention, by disposing the optical filter between the observing means and the reflector, it is possible to cut harmful rays without increasing the diameter of the device. In addition, an optical filter assembly divides and forms a reflector storage chamber and an observation means storage chamber, and an optical filter is arranged between the observation means and the reflector to provide a cooling gas guide for guiding cold air to the optical filter assembly. By providing, efficient cooling can be performed without waste according to the heat resistance characteristics of the reflector and the observation means.

[0015]

FIG. 1 is a sectional view showing an embodiment of the in-furnace observation device with a filter of the present invention.

The in-furnace observation device 50 with a filter is composed of a cylindrical cooling box 1 and a support rod 2 connected to the base end of the box 1.

The support rod 2 is a cold air introduction pipe 2 provided in the central portion.
a and a cooling water conduit 2b provided on the outer periphery thereof are built-in, and a cable for controlling a camera or the like 2c is provided in the cold air introducing pipe 2a.
Is provided.

The cooling box 1 is a metallic cooling case 1.
A heat insulating material 1b is stretched outside a, and a water jacket 3 including an inner pipe 3a and an outer pipe 3b through which cooling water circulates is further provided.

Reference numeral 4 denotes a transparent observation window provided on the side surface of the cooling box 1 for observing the inside of the furnace. Prevents devitrification and damage due to high heat.

Inside the cooling box 1, a reflector 5 directed to the observation window 4 (the reflector in the present invention is not only a normal plate-shaped mirror but also a prism or the like capable of changing the image angle). Are collectively referred to). 6 is
The television camera is an observation device that captures an image of the inside of the furnace reflected on the reflector 5, and is connected to an observation monitor (not shown) provided outside the furnace. Reference numeral 8 is a cool air discharge hole provided to cool the observation window 4.

A set of three infrared filters 7 is arranged between the reflector 5 and the television camera 6. This infrared filter 7 prevents the inside of the television camera 6 from melting by reflecting infrared rays emitted from a high-temperature subject, and for example, heat-resistant glass whose surface is covered with a metal oxide film can be used. it can. The number of infrared filters 7 to be installed and the interval between the filters can be arbitrarily determined according to the conditions such as the subject temperature and the required cooling amount, and the temperature can be controlled by increasing or decreasing the number of filters. At this time, since the infrared filter 7 is arranged between the reflector 5 and the television camera 6, the miniaturization (diameter) does not change even if the number of filters is increased. Further, since the cooling gas flows between the infrared filters 7 to be cooled,
Furthermore, a stable filter effect and protection of the television camera 6 are possible. In particular, as shown in FIG. 2, one infrared filter 7 is provided adjacent to the observation window 4 and the other two filters are arranged between the reflector 5 and the television camera 6 to remove the reflector 5. Can also be protected from the effects of infrared rays.

By thus disposing the infrared filter 7 between the reflector 5 and the television camera 6, the television camera 6 is protected from harmful light rays without increasing the diameter of the device 50, and the resolution of the resolution is reduced. It is possible to take excellent images.

In this embodiment, the infrared filter 7 for cutting harmful infrared rays has been described, but the present invention is not limited to this, and an infrared absorption filter, Various optical filters such as an infrared transmission filter, an ultraviolet filter, and a single wavelength transmission filter can be used, and it is also possible to use a combination of several kinds of these filters.

FIG. 3 is a sectional view showing another embodiment, in which the reflector 5 and the television camera 6 are partitioned by the optical filter assembly 10, and the reflector storage chamber 11 and the observation means storage chamber 12 are provided.
Is formed. In the examples below,
The same parts as those in the above-described embodiment are designated by the same reference numerals and the description thereof will be omitted.

The optical filter assembly 10 according to the present embodiment is attached to a metallic partition 13 which is hermetically attached to the inner circumference of the cooling box 1 and a substantially central portion of the partition 13 with a space therebetween. And a set of two optical filters 14 arranged. As the optical filter 14, various ones can be used as described in the previous embodiment. A slit-like cold air inlet 15 communicating with the space between the two optical filters 14 is provided in the lower part of the optical filter assembly 10 on the observation means housing chamber 12 side, and further on the reflector housing chamber side 11 upper part. Forms a cool air discharge port 16 communicating with the insertion port 15 and connects them to the observation means storage chamber 12
To the reflector storage chamber 11 as a cold air passage. Therefore, cold air with a pressure in the observation means storage chamber 12 (arrow)
Will pass through the cold air inlet 15 between the two optical filters 14, and will be taken into the reflector housing chamber 11 from the cold air outlet 16. Further, the cool air in the reflector storage chamber 11 is discharged to the outside while cooling the heat resistant glass of the observation window 4. Further, since the cool air discharge port 16 is arranged on the opposite side of the observation window 4, that is, on the back side of the reflector 5, the cool air from the discharge port 16 can effectively cool the reflector 5. it can.

As described above, the cold air once taken into the observing means storage chamber 12 first cools the television camera 6 which is weak against heat to the heat resistant temperature of 40 to 50 ° C., and further cools the entire surface of the optical filter 14. While being incorporated into the reflector storage chamber 11. Then, the cool air whose temperature has risen by cooling the camera 6 cools the reflector 5 relatively resistant to heat to 200 to 300 ° C. which is the heat resistant temperature. As a result, it is possible to appropriately cool the television camera 6 and the reflector 6 without wasting them, without cooling the reflector 5 more than necessary. Therefore,
Compared to the conventional one in which both the reflector 5 and the TV camera 6 are cooled to the same temperature, the supply amount of cooling air can be significantly reduced, which simplifies and downsizes the entire device. It is possible and safety is improved.

In the embodiment shown in FIG. 3, an example in which the reflector storage chamber 11 and the observation means storage chamber 12 are divided is described. However, it is not completely divided into two storage chambers in this way, and FIG. 4, a plurality of infrared filters 14 are arranged between the television camera 6 and the reflector 5, and a cooling gas guide 17 for guiding a cooling gas is provided between the infrared filters 14. It may be one. The cooling gas guide 17 can be formed by appropriately arranging a plate-shaped member or a pipe-shaped member to guide the cool air toward the infrared filter 14. By doing so, an air curtain is formed around the infrared filter 14 by the flow of cold air, and a space for housing the reflector 5 and a space for housing the television camera 6 are substantially enabled.

[0028]

As described above, according to the present invention, by disposing the optical filter between the observing means and the reflector, harmful light rays can be cut without increasing the diameter of the device. It became possible to make the device compact.
A cooling gas guide for guiding cool air to the reflector by arranging an optical filter assembly between the observing means and the reflector by partitioning and forming the reflector housing and the observing means housing. By providing the above, it becomes possible to efficiently cool the reflector and the observation means according to the heat resistance characteristics of the reflector with a small amount of cool air, and it is also possible to make the apparatus compact. Therefore, the handling performance of the apparatus is improved, and it is possible to provide an in-furnace observation apparatus with a filter that can be inserted into the furnace through a very small apparatus insertion hole.

[Brief description of drawings]

FIG. 1 is a sectional view of an in-furnace observation device with a filter according to the present embodiment.

FIG. 2 is an explanatory diagram showing another arrangement example of the optical filter.

FIG. 3 is a cross-sectional view of another embodiment of the in-furnace observation device with a filter.

FIG. 4 is a cross-sectional view of another embodiment of the in-furnace observation device with a filter.

[Explanation of symbols]

 1 Cooling Box 1a Metal Container 1b Insulation Material 2 Support Rod 2a Cold Air Introduction Pipe 2b Cooling Water Introduction Path 2c Cable Piping 3 Water Jacket 3a Inner Pipe 3b Outer Pipe 4 Observation Window 5 Reflector 6 Television Camera (Observation Means) 7 Infrared Filter (Optical Filter) 8 Cold Air Discharge Hole 10 Optical Filter Assembly 11 Reflector Storage Room 12 Observing Means Storage Room 13 Partition 14 Optical Filter 15 Cold Air Insertion Port 16 Cold Air Discharge Port 17 Cooling Gas Guide 50 In-Furnace Observation Device with Filter

Claims (3)

[Claims] 1. A cooling box provided with an observation window on a side surface,
An in-furnace observing device comprising a reflector built in the cooling box and directed to the observing window, and an observing means for picking up an in-furnace image reflected on the reflecting body, wherein an optical filter is provided between the observing means and the reflector. An in-furnace observation device with a filter characterized in that. 2. A cooling box provided with an observation window on a side surface,
An in-furnace observing device comprising a reflector built in the cooling box and directed to the observation window, and an observing means for picking up an in-furnace image reflected on the reflecting body, wherein an optical filter is provided between the reflector and the observing means. A reflector storage chamber and an observation means storage chamber are formed by partitioning with an assembly, and a cold air introduction pipe is further connected to the observation means storage chamber, and cold air in the observation means storage chamber is transferred to the reflector storage chamber. An in-furnace observation device with a filter, wherein a cool air passage for taking in is provided in the optical filter assembly. 3. A cooling box provided with an observation window on a side surface,
An in-furnace observing device comprising a reflector built in the cooling box and directed to the observing window, and an observing means for picking up an in-furnace image reflected on the reflecting body, wherein an optical filter is provided between the observing means and the reflector. And a cooling gas guide that guides cold air to the optical filter.