JPS648276B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for observing the interior of an enclosure.

The following will be described as an apparatus for observing the inside of a blast furnace, but the blast furnace is merely shown as an example. Therefore, it should be understood that the apparatus of the present invention is not limited to use in blast furnaces.

Now, a charge is put into the blast furnace as its raw material. This charge must be distributed as well as possible within the furnace. For this purpose, it is possible to observe the top surface of the charge in the furnace and obtain information such as changes in the shape of the top surface, distribution of surface temperature from the center to the periphery, and where hot and cold spots occur. It's important.

This information is useful for injecting the coke, ore, and flux into the blast furnace at optimal positions, thereby contributing to the blast furnace operating under optimal conditions.

Therefore, this information must be obtained by accurately observing the top surface of the charge using equipment as reliable as possible. By the way, the inside of a blast furnace is very dusty and under pressure (for example, 2 bar) due to the charged materials, so it is quite difficult to look inside the blast furnace accurately at all times.

However, the applicant proposes that a device for observing the interior of an enclosure a. a measuring instrument, b a stiffening plate arranged in front of and in close proximity to said measuring instrument, opposite said opening in said end of said measuring instrument, also of a very small diameter (preferably 10mm or less)
c) a device for flowing compressed gas into the space between the measuring instrument and the shield plate and causing it to flow out from the opening of the shield plate into the enclosure; , and d. A method has already been proposed which is provided with means for periodically or continuously cleaning the surface of the shield plate on the opposite side from the measuring instrument, and at least the surface of the part containing the opening. There is.

Note that the enclosure may be a blast furnace or any other type of furnace. Also, regarding the measuring instrument, it may be a simple visual device;
Alternatively, it may be a television camera suitable for visible or infrared light in combination with an objective lens or a measuring device (telemeter, pirometer) with or without scanning technology.

By the way, the above-mentioned device which is commonly used at present for observing the inside of an enclosure is sufficient if it is airtightly fixed in a hole of an appropriate size drilled in the wall of the enclosure, but it is expensive and requires a large space. It demands. This is because, in addition to the scraping means for cleaning around the observation opening provided in the shield plate, it is also necessary to protect the inside of the housing in which the measuring instruments are placed from the dusty atmosphere inside the enclosure. This is because a sealing valve is required to fuse the housing and the enclosure.

Incidentally, since dust in the atmosphere that has grown around the opening of the shield plate narrows the observation field of view, the scraping means scrapes off this deposit.

The present invention includes a measuring instrument provided outside the enclosure, a shield plate disposed in front of the measuring instrument and having a very small opening, and a side of the shield plate opposite to the measuring instrument. In an apparatus for observing the inside of an enclosure, the opening of the shield plate is closed during the period of inactivity to protect the measuring instruments from the dusty atmosphere inside the enclosure. The scraping device is characterized by having the function of keeping the opening closed and opening the opening during the observation period. This makes it possible to eliminate the conventional separately provided shutoff valve, making it possible to simplify and downsize the device for observing the inside of the enclosure.

To explain the invention in more detail, the inner surface of the shield plate (the surface opposite the measuring instrument) has an airtight packing around an opening provided for observation;
The scraping means is a scraping plate formed into a flat plate so as to completely cover the airtight packing, and the scraping plate has holes that are aligned with the openings in the shielding plate so as to cover the airtight packing even during the observation period. It has an opening.

Preferably, the reciprocating movement of the scraper plate is effected by the reciprocating rotational movement of a rotating shaft arranged substantially perpendicular to the plane of the scraper plate.

Also preferably, the shingle plate has a groove for slidably receiving the free end of the scraper plate. This groove prevents the ends of the scraper from lifting up and keeps the scraper pressed against the airtight packing of the shingle board.

Still more preferably, the distal end of the scraper plate is configured to automatically clean the grooves of the shingle plate as the scraper plate reciprocates.

Still more preferably, the connection between the scraping board and the rotating shaft for reciprocating the scraping board is relatively free over a certain range, and the rotating shaft is precisely perpendicular to the scraping board. At the very least, make sure that the scraping board is aligned with the sharp board.

Still more preferably, the rotating shaft has a guide so as to surround the arm of the scraping board. This ensures that the scraping board is driven by the rotating shaft.

A more specific explanation will be given below with reference to the drawings. An apparatus for viewing the interior of a walled enclosure through its walls is shown in FIGS. 1 and 2. Of these, FIG. 1 shows a vertical cross section, and FIG. 2 is a plan view seen from below. Now, the plate 3 is sealed in a hole formed through the wall and constitutes a part of the wall. A cylindrical jacket 1 is attached to the outer surface of this plate 3, and another cylindrical jacket 2 is arranged inside this jacket 1 and is also attached to the plate 3. A measuring instrument (for example a pyrometer) is arranged in this double-protected housing.

The plate 3 has a hole, and a shielding plate 5 is placed in the hole. This shield plate 5 has an opening 6 with a very small diameter (10 mm or less). The opening 6 is shaped so that the interior of the enclosure can be observed over an angular range of up to 90°. The shield plate 5 is provided on its inner side 12 with an airtight packing 8 around the opening 6. Inner surface 1 of this flexible plate 5
Scraping means are provided facing this inner surface 12 for cleaning the inner surface 12. This scraping means is a plate type scraping board 9.

The scraping board 9 consists of a solid part and a perforated part,
The hole 14 in the perforated portion is connected to the opening 6 in the shield plate 5.
has dimensions substantially the same as the dimensions of. The scraper plate 9 is arranged substantially parallel to the shingle plate 5 and at a small distance from said inner surface 12 of the shingle plate 5. In this state, the airtight packing 8 is pressed against the scraper plate 9. This scraper plate 9 can reciprocate on the inner surface 12 of the shield plate 5 between an observation position and a rest position, and in the observation position, the hole 14 of the scraper plate 9 and the opening 6 of the shield plate 5 are connected to each other. coincide, and in the rest position the solid portion of the scraper plate 9 covers the opening 6 of the shield plate 5. The shape and dimensions of the scraping board 9 are such that the scraping board 9
The flat surface 13 of the airtight packing 8 always covers the airtight packing 8.

The shielding plate 5 is thus cleaned around the opening 6 by the reciprocating movement of the scraping plate 9, and in the rest position the dusty atmosphere inside the enclosure does not enter around the opening 6.

The reciprocating motion of the scraper plate 9 is brought about by the rotation of the rotating shaft 11. The rotation axis 11 is substantially perpendicular to the inner surface 12 of the shield plate 5 and is arranged outside the observation field. Note that the scraping board 9 is the arm 10
This arm 10 is connected to a rotating shaft 11.

Rotating shaft 11 with respect to inner surface 12 of shield plate 5
The scraping board 6 is supported in such a way that its plane 13 always faces substantially parallel to the inner surface 12 of the stiffening board 5 during the reciprocating movement of the scraping board 9, even if it is not completely vertical. The arm 10 is attached with some play to a small-diameter central shaft 18 extending from the inner end of a rotary shaft 11 that rotates reciprocatingly. In order to reliably transmit the rotational motion of the rotating shaft 11 to the arm 10, there is a guide 19 fixed to the rotating shaft 11.
The arm 10 is engaged with. Note that there is a cylindrical surface engaging portion 17 between the rotating shaft 11 and a nut screwed onto the inner end of the small-diameter central shaft 18 .

The end 16 of the scraper plate 9 is positioned farthest from the rod 10 so that the flat surface 13 of the scraper plate 9 is always in pressure contact with the airtight packing 8 while the scraper plate 9 reciprocates on the inner surface 12 of the stiffener plate 5. It is engaged with the groove 15 and guided. This groove 15 is provided in the shield plate 5. The shape of the end 16 of the scraper plate 9 is made at an acute angle so that the groove 15 is automatically cleaned during the reciprocating movement of the scraper plate 9.

The inner surface of the flat scraper plate 9 is preferably cleaned by one or more auxiliary scrapers 20.
Such an auxiliary scraping tool 20 is, for example, a shield plate 5.
is fixedly attached to.

Preferably, the plate 3 is provided with a window 4 at a position outside the shield plate 5 in the hole in which the shield plate 5 is provided. This window 4 is made of a material that allows the line to be sensed by the measuring instrument to pass through. The space 7 between the window 4 and the shield board 5
Then, dry, deoiled compressed air is fed from a supply device (not shown). This compressed air flows into the enclosure through the opening 6, and
clean.

[Brief explanation of drawings]

FIG. 1 shows, in vertical section, a device for monitoring the interior of an enclosure according to the invention. FIG. 2 is a horizontal view of the device of FIG. 1 from below. In the figure, 5 is a thin plate, 6 is an opening, 8 is an airtight packing, 9 is a scraping plate, 10 is an arm, 11 is a rotating shaft, 12 is an inner surface, 14 is a hole, 15 is a groove, 1
6 is the end, 19 is the guide.

Claims (1)

[Scope of Claims] 1. A device for observing the inside of an enclosure surrounded by a wall through the wall, comprising a shield plate disposed in a hole formed through the wall. The shielding plate has an inner surface and an outer surface and has an opening of very small dimensions passing through the plate, with a scraper placed facing the inner surface for cleaning said inner surface. In an apparatus for observing the inside of an enclosure, the scraping means is a plate-type scraping board, and the scraping board is composed of a solid part and a perforated part, and the perforated part has a hole. having substantially the same dimensions as the dimensions of the opening in the shield plate, the scraper plate being substantially parallel to the shield plate and a short distance from the inner surface of the shield plate; the scraper plate is rotatable in its own plane between an observation position and a rest position, in which the hole in the scraper plate coincides with the opening in the shield plate, and the scraper plate is rotatable in its own plane between an observation position and a rest position; In position, the solid portion of the shingle board is arranged to cover the opening in the shingle board, and between the shingle board and the shingle board, the solid part is arranged around the opening in the shingle board from inside the enclosure. A device for observing the inside of an enclosure, characterized in that airtight packing is arranged to prevent any dissipation of atmosphere. 2. The shingle plate is characterized in that it is provided with one groove for receiving the end of the scraper plate and for keeping this scraper in contact with the air-tight packing during its movement on the shield plate. An apparatus as claimed in claim 1. 3. A patent claim characterized in that the contour of the distal end of the scraping board fitted into the groove of the cutting board to be cleaned has a shape that ensures automatic cleaning of the groove as the scraping board moves. Range 1 or 2
Equipment described in Section. 4. The mechanism of coupling of the scraping board to its axis of rotation on the surface of the shivering board is characterized in that it exhibits one degree of freedom that also rotates the scraping board at right angles to the plane of the shivering board. Claims 1 to 3
Equipment described in any of the preceding paragraphs. 5. Claims 1 to 4 are characterized in that they include one guiding device surrounding the arm of the scraping board in order to correctly rotate the scraping board perpendicular to the plane of the cutting board to be scraped. Devices listed in any of the above.