JP3172563U - Blast furnace monitoring device - Google Patents

Abstract

Provided is a blast furnace monitoring device capable of monitoring the inside of a blast furnace through the whole tuyeres of a blast furnace even when the tuyere sight tube is greatly inclined with respect to the blow pipe.
A blast furnace monitoring device includes an observation window 4 for visually observing a tuyere through a tuyere sight tube 3 connected to a rear end of a blow pipe 2 for blowing hot air to the tuyere of a blast furnace, and an observation window. 4, a half mirror 5 disposed between the tuyere peep tube 3, an imaging unit 6 that receives the light reflected by the half mirror 5 and images the tuyere, and a housing 7 that houses the imaging unit 6. It has. The casing 7 is curved in an arc shape around the optical axis 17 of the light reflected by the half mirror 5, and the radius of curvature is smaller than the optical path length from the tip of the tuyere sight tube 3 to the imaging unit 6, and the tuyere sight. A field adjustment mechanism is provided that adjusts the imaging field of the imaging unit 6 along a curved surface that is larger than the optical path length from the rear end of the tube 3 to the imaging unit 6.
[Selection] Figure 1

Description

  The present invention relates to a blast furnace monitoring device that monitors the inside of a blast furnace through a tuyere of the blast furnace.

In general, during the blast furnace operation, raw materials such as iron ore and coke are charged from the top of the blast furnace, hot air is blown into the blast furnace from the blow pipe connected to the tuyere of the blast furnace, and pig iron is taken out from the outlet of the blast furnace. In order to monitor the combustion state of the raw material charged in the blast furnace, the tuyere is visually observed through a tuyere sight tube connected to the rear end of the blow pipe.
However, such in-furnace monitoring by visual observation has nearly 40 tuyere and the blast furnace area is in a severe temperature environment. There was a problem of requiring time and great effort.

  Therefore, as a device for monitoring the inside of the blast furnace, an observation window for visually observing the tuyere through the tuyere sight tube, a half mirror disposed between the observation window and the tuyere sight tube, and this half mirror Patent Document 1 describes a blast furnace monitoring device including an imaging unit that receives reflected light and images a tuyere. Also, Patent Documents 2 and 3 describe blast furnace monitoring devices that include an imaging unit that receives light reflected by a half mirror and images the tuyere.

Utility Model Registration No. 3160453 Japanese Utility Model Publication No. 58-84533 JP-A-60-187608

  According to the blast furnace monitoring device described in Patent Document 1, it is possible for the supervisor to monitor the inside of the blast furnace without visually observing all tuyere, but there are the following problems. That is, in the device described in Patent Document 1, the half mirror is held by a cylindrical mirror holder, and the angle of the half mirror is adjusted by pressing the tip of the adjusting screw against the outer peripheral surface of the mirror holder from above. ing. For this reason, the range in which the field of view can be adjusted is small, and as shown in FIG. 12, when the tuyere sight tube 3 is greatly inclined with respect to the blow pipe 2, the field of view is lost, and the entire blast furnace tuyeres There was a possibility that it could not be monitored.

In order to enable a large field of view adjustment range by adjusting the angle of the half mirror, for example, it is conceivable to increase the inner diameter of the tuyere sight tube, but since there are nearly 40 tuyere, major equipment modifications are required. Because it is, it is not a realistic method.
In addition, there is no description about adjusting the angle of the half mirror of the blast furnace monitoring apparatus described in Patent Documents 2 and 3.
The present invention has been made in view of the above-mentioned problems, and can monitor the inside of the blast furnace through the whole blast furnace tuyeres even when the tuyere sight tube is greatly inclined with respect to the blow pipe. An object is to provide an apparatus.

  In order to solve the above-mentioned problems, the invention of claim 1 is directed to a tuyere sight tube connected to a rear end of a blow pipe for blowing hot air to a tuyere of a blast furnace, and the tuyere is visually observed through the tuyere sight tube. An observation window for observation, a half mirror disposed between the observation window and the tuyere sight tube, an imaging unit that receives the light reflected by the half mirror and images the tuyere, and A blast furnace monitoring device including a housing for storing an imaging unit, wherein the imaging field of view of the imaging unit is adjusted along a curved surface that is curved in an arc shape around the optical axis of light reflected by the half mirror The visual field adjustment mechanism is provided in the casing, and the curvature radius of the curved surface is made larger than the optical path length from the half mirror to the imaging unit.

The invention of claim 2 is characterized in that, in the blast furnace monitoring device of claim 1, the radius of curvature of the curved surface is made larger than the optical path length from the rear end of the tuyere sight tube to the imaging unit. .
The invention according to claim 3 is the blast furnace monitoring device according to claim 2, wherein the radius of curvature of the curved surface is made smaller than the optical path length from the tip of the tuyere sight tube to the imaging unit.

  The device of claim 4 is the blast furnace monitoring device according to any one of claims 1 to 3, wherein the two visual field adjustment knobs are rotatably provided on the outside of the casing, and the visual field adjustment knobs. Two visual field adjusting shafts that protrude perpendicularly to the inside of the housing and are eccentric with respect to the rotation center of the visual field adjustment knob, and two visual fields that have engagement holes that engage with the visual field adjustment shafts The visual field adjustment mechanism includes an adjustment shaft engaging member and two imaging unit support members that support the imaging unit so as to be movable in the axial direction of the visual field adjustment shaft via the visual field adjustment shaft engaging member. It is characterized by.

According to a fifth aspect of the present invention, in the blast furnace monitoring device according to the fourth aspect, one of the two visual field adjusting shaft engaging members is fixed to the imaging unit, and the other visual field adjusting member is adjusted. A shaft engaging member is connected to one of the imaging unit support members.
The invention of claim 6 is the in-furnace monitoring apparatus according to claim 5, wherein the visual field adjustment shaft engaging member which is not connected to the visual field adjustment shaft engaging member of the two imaging unit support members is the It is fixed to the housing.
The invention of claim 7 is the blast furnace monitoring device according to any one of claims 4 to 6, wherein the dovetail groove fitted into the dovetail fitting portion formed in the visual field adjusting shaft engaging member is the An imaging unit support member has, and the dovetail groove is curved in an arc shape with the same radius of curvature as the curved surface.

The invention of claim 8 is characterized in that, in the blast furnace monitoring device according to any one of claims 4 to 7, the engagement hole is formed in a slit shape along the optical axis.
The invention of claim 9 is the blast furnace monitoring device according to any one of claims 4 to 8, wherein a through-hole formed in a circular shape with a radius larger than the amount of eccentricity of the visual field adjustment shaft is provided in the imaging unit support member. And the visual field adjusting shaft is engaged with the engaging hole through the through hole.

  According to the present invention, it is possible to adjust the imaging field of view of the imaging unit without adjusting the angle of the half mirror with the adjusting screw. Therefore, even when the tuyere sight tube is inclined with respect to the blow pipe, The inside of the blast furnace can be monitored throughout the tuyere.

It is a partial cross section side view of the blast furnace monitoring device concerning one embodiment of the present invention. It is a figure which shows the AA cross section of FIG. It is a figure which shows the BB cross section of FIG. It is a figure which shows CC cross section of FIG. It is a figure which shows the DD cross section of FIG. It is a figure which shows the EE cross section of FIG. It is a figure which shows the FF cross section of FIG. It is a figure which shows the GG cross section of FIG. It is a figure which shows the state of an imaging unit when one visual field adjustment knob of the visual field adjustment mechanism shown in FIG. 2 is rotationally operated. It is a figure which shows the state of an imaging unit when the other visual field adjustment knob of the visual field adjustment mechanism shown in FIG. 2 is rotated. It is a figure which shows the curvature center of the curved surface curved in circular arc shape centering | focusing on the optical axis of the light reflected with the half mirror. It is a figure for demonstrating the problem of a prior art in case a tuyere sight tube is inclined with respect to a blowpipe.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a partial sectional side view of a blast furnace monitoring apparatus according to an embodiment of the present invention. As shown in FIG. 1, the blast furnace monitoring apparatus 1 according to an embodiment of the present invention includes an observation window 4. , Half mirror 5, imaging unit 6, housing 7, connector unit 9, seal unit 10, purge gas introduction unit 13, and IR filter 14.

The observation window 4 is for visually observing the tuyere (not shown) of the blast furnace through the tuyere sight tube 3 connected to the rear end of the blow pipe 2, and is a glass plate having heat resistance such as cobalt glass. Formed from.
The half mirror 5 divides the light from the tuyere sight tube 3 into transmitted light and reflected light, and is disposed between the tuyere sight tube 3 and the observation window 4 at an angle of 45 °, for example.

The imaging unit 6 receives light reflected by the half mirror 5 and images the blast furnace tuyere, and is composed of, for example, an objective lens and a CCD camera.
The housing 7 accommodates the image pickup unit 6 together with the half mirror 5, and is formed in a box shape by a plurality of metal plates made of, for example, aluminum. The housing 7 has a purge air supply port 8, and the interior of the housing 7 is less than the atmospheric pressure by the purge air supplied from the purge air supply pipe connected to the purge air supply port 8. High pressure.

The connector unit 9 is for connecting the imaging unit 6 to an image display device such as a power source or a monitor television (not shown), and is provided in the housing 7.
The seal unit 10 is for sealing a daylighting opening window formed in the housing 7 so as to face the half mirror 5, and for example, a seal body 11 made of a transparent glass plate, and this seal body 11 is connected to the tuyere A cylindrical seal body holder 12 held between the viewing tube 3 and the housing 7 is configured.

The purge gas introduction unit 13 is for introducing an inert gas such as nitrogen gas as a purge gas between the tuyere sight tube 3 and the seal unit 10, and the purge unit introduced by the purge gas introduction unit 13 uses the seal unit 10. This prevents dust and the like from adhering to the seal body 11.
The IR filter 14 cuts infrared rays generated in the blast furnace, and is disposed between the half mirror 5 and the seal unit 10.

  2 is a cross-sectional view taken along line AA in FIG. 1, FIG. 3 is a cross-sectional view taken along line BB in FIG. 2, FIG. 4 is a cross-sectional view taken along line CC in FIG. FIG. 6 is a diagram showing a D cross section, FIG. 6 is a diagram showing a EE cross section of FIG. 2, FIG. 7 is a diagram showing a FF cross section of FIG. 2, and FIG. 8 is a diagram showing a GG cross section of FIG. As shown in FIG. 2, the housing 7 has a visual field adjustment mechanism 16. The visual field adjustment mechanism 16 adjusts the imaging visual field of the imaging unit 6 along a curved surface that is curved in an arc shape around the optical axis 17 (see FIG. 1) of the light reflected by the half mirror 5. If the optical path length from the tip of the viewing tube 3 (the rear end of the blow pipe 2) to the imaging unit 6 is L1, and the optical path length from the rear end of the tuyere viewing tube 3 to the imaging unit 6 is L2, the optical axis 17 is the center. In this embodiment, the radius of curvature R of the curved surface that is curved in an arc shape is L1> R> L2.

  The visual field adjustment mechanism 16 has visual field adjustment knobs 18 and 19, and these visual field adjustment knobs 18 and 19 are provided on the outside of the housing 7 so as to be rotatable. The visual field adjustment mechanism 16 has visual field adjustment shafts 20 and 21 (see FIGS. 3 and 7). These visual field adjustment shafts 20 and 21 are orthogonal to each other from the visual field adjustment knobs 18 and 19 to the inside of the housing 7. And is eccentric with respect to the center of rotation of the visual field adjustment knobs 18 and 19.

  The visual field adjustment mechanism 16 includes plate-shaped visual field adjustment shaft engaging members 22 and 23, and one of the visual field adjustment shaft engaging members 22 and 23 is a visual field adjustment shaft engaging member. The imaging unit 6 is fixed to the joint member 22. The visual field adjusting shaft engaging members 22 and 23 have engaging holes 24 and 25 (see FIGS. 3 and 7) that engage with the visual field adjusting shafts 20 and 21. These engaging holes 24 and 25 are half-shaped. A slit is formed along the optical axis 17 of the light reflected by the mirror 5.

The visual field adjustment mechanism 16 also includes plate-shaped imaging unit support members 26 and 27 that support the imaging unit 6 movably in the axial direction of the visual field adjustment shafts 20 and 21 via the visual field adjustment shaft engaging members 22 and 23. Have. Of these imaging unit support members 26, 27, for example, the imaging unit support member 26 is connected to the visual field adjustment shaft engaging member 23 on which the imaging unit 6 is not fixed, and the imaging unit support member 27 is an inner surface of the housing 7. It is fixed to.
The imaging unit support members 26 and 27 are fitted with dovetail grooves 30 and 31 (FIG. 4) to be fitted with dovetail fitting portions 28 and 29 (see FIGS. 3 and 4) formed in the visual field adjusting shaft engaging members 22 and 23, respectively. The dovetail grooves 30 and 31 are curved in an arc shape with the same curvature radius as that of the curved surface described above.

The imaging unit support members 26 and 27 have through holes 32 and 33 (see FIGS. 4 and 8) formed in a circle with a radius larger than the eccentric amount of the visual field adjustment shafts 20 and 21, and these through holes 32. , 33 and the front end portions of the visual field adjusting shafts 20 and 21 are engaged with the engaging holes 24 and 25 of the visual field adjusting shaft engaging members 22 and 23, respectively.
FIG. 9 is a diagram illustrating a state of the imaging unit 6 when the visual field adjustment knob 18 of the visual field adjustment mechanism 16 is rotated. FIG. 10 is a state of the imaging unit 6 when the visual field adjustment knob 19 of the visual field adjustment mechanism 16 is rotated. When the visual field adjustment knob 18 of the visual field adjustment mechanism 16 is rotationally operated, the visual field adjustment shaft 20 moves circularly in accordance with this. When the visual field adjustment shaft 20 moves circularly, as shown in FIG. 9, the visual field adjustment shaft engaging member 22 extends in the axial direction of the visual field adjustment shaft 21 along the dovetail groove 30 formed in the imaging unit support member 26. Accordingly, the imaging field of the imaging unit 6 is adjusted by the field adjustment knob 18.

  On the other hand, when the visual field adjustment knob 19 of the visual field adjustment mechanism 16 is rotated, the visual field adjustment shaft 21 is caused to perform a circular motion. Then, when the visual field adjustment shaft 21 moves circularly, the visual field adjustment shaft engaging member 23 extends in the axial direction of the visual field adjustment shaft 20 along the dovetail groove 31 formed in the imaging unit support member 27, as shown in FIG. Accordingly, the imaging field of the imaging unit 6 is adjusted by the field adjustment knob 19.

  Therefore, as in the above-described embodiment of the present invention, the visual field adjustment mechanism that adjusts the imaging visual field of the imaging unit 6 along the curved surface that is curved in an arc shape around the optical axis 17 of the light reflected by the half mirror 5. By providing 16 on the housing 7, the imaging field of view of the imaging unit 6 can be adjusted without adjusting the angle of the half mirror 5 with the adjusting screw. Even if it is tilted, the inside of the blast furnace can be monitored through the whole tuyere of the blast furnace.

  FIG. 11 is a view showing the center of curvature of a curved surface that is curved in an arc shape around the optical axis 17 of the light reflected by the half mirror 5. FIG. 11A shows the radius of curvature R of the curved surface after the tuyere peeping tube 3. The case where it is made smaller than the optical path length L2 from the end to the imaging unit 6 is shown. (B) makes the radius of curvature R of the curved surface smaller than the optical path length L1 from the tip of the tuyere sight tube 3 to the imaging unit 6, and the tuyere The case where it is made larger than the optical path length L2 from the rear end of the viewing tube 3 to the imaging unit 6 is shown.

  When the curvature radius R of the curved surface curved in an arc shape around the optical axis 17 of the light reflected by the half mirror 5 is made smaller than the optical path length L2 from the rear end of the tuyere peeping tube 3 to the imaging unit 6, FIG. As shown in a), the center of curvature O of the curved surface is located on the optical axis between the tuyere sight tube 3 and the imaging unit 6. When the curvature center O of the curved surface is on the optical axis between the tuyere sight tube 3 and the imaging unit 6, the range in which the imaging field of view of the imaging unit 6 can be adjusted by the visual field adjustment mechanism 16 is indicated by an angle θ1. It becomes.

  On the other hand, the curvature radius R of the curved surface that is curved in an arc shape around the optical axis 17 of the light reflected by the half mirror 5 is made smaller than the optical path length L1 from the tip of the tuyere sight tube 3 to the imaging unit 6, and the tuyere If it is larger than the optical path length L2 from the rear end of the viewing tube 3 to the imaging unit 6, the curvature center O of the curved surface is positioned inside the tuyere viewing tube 3 as shown in FIG. . When the curvature center O of the curved surface is inside the tuyere peeping tube 3, the range in which the field of view of the imaging unit 6 can be adjusted by the field of view adjusting mechanism 16 is the range indicated by the angle θ2 (> θ1).

  Therefore, as in the embodiment of the present invention described above, by setting the curvature radius R of the curved surface curved in an arc shape around the optical axis 17 of the light reflected by the half mirror 5 as L1> R> L2, Since it is possible to secure a large range in which the imaging field of the imaging unit 6 can be adjusted by the visual field adjustment mechanism 16, even when the tuyere peeping tube 3 is largely inclined with respect to the blowpipe 2, the whole tuyere of the blast furnace is used. The inside of the blast furnace can be monitored.

  In the embodiment of the present invention described above, the curvature radius R of the curved surface that is curved in an arc shape around the optical axis 17 of the light reflected by the half mirror 5 is set from the tip of the tuyere sight tube 3 to the imaging unit 6. The optical path length L1 is smaller than the optical path length L1 and larger than the optical path length L2 from the rear end of the tuyere sight tube 3 to the imaging unit 6. For example, the radius of curvature of the curved surface may be larger than the optical path length from the half mirror 5 to the imaging unit 6 or may be larger than the optical path length from the rear end of the tuyere peeping tube 3 to the imaging unit 6.

DESCRIPTION OF SYMBOLS 1 ... Blast furnace monitoring apparatus 2 ... Blow pipe 3 ... Feather sight tube 4 ... Observation window 5 ... Half mirror 6 ... Imaging unit 7 ... Housing 8 ... Purge air supply port 9 ... Connector unit 10 ... Seal unit 11 ... Seal Body 12 ... Seal body holder 13 ... Purge gas introduction unit 14 ... Filter 16 ... Field of view adjustment mechanism 17 ... Optical axis 18, 19 ... Field of view adjustment knob 20, 21 ... Field of view adjustment shaft 22, 23 ... Field of view adjustment shaft engaging member 24, 25 ... engaging hole 26, 27 ... imaging unit support member 28, 29 ... dovetail groove fitting part 30, 31 ... dovetail groove 32, 33 ... through hole

Claims (9)

A tuyere sight tube connected to the rear end of a blow pipe for blowing hot air to the tuyere of the blast furnace, an observation window for visually observing the tuyere through the tuyere sight tube, the observation window and the tuyere A blast furnace monitoring device comprising a half mirror disposed between the viewing tube, an imaging unit that receives light reflected by the half mirror and images the tuyere, and a housing that houses the imaging unit Because
A visual field adjustment mechanism for adjusting an imaging visual field of the imaging unit along a curved surface curved in an arc shape around the optical axis of the light reflected by the half mirror is provided in the housing, and the curvature radius of the curved surface is A blast furnace monitoring apparatus characterized in that it is longer than the optical path length from a half mirror to the imaging unit.   2. The blast furnace monitoring apparatus according to claim 1, wherein a radius of curvature of the curved surface is made larger than an optical path length from a rear end of the tuyere sight tube to the imaging unit.   The blast furnace monitoring apparatus according to claim 2, wherein a radius of curvature of the curved surface is made smaller than an optical path length from a tip of the tuyere sight tube to the imaging unit.   Two visual field adjustment knobs provided on the outside of the casing so as to be rotatable, and projecting from the visual field adjustment knobs to the inside of the casing so as to be orthogonal to each other and being eccentric with respect to the rotation center of the visual field adjustment knob Two visual field adjustment shafts, two visual field adjustment shaft engaging members having engagement holes engaged with the visual field adjustment shafts, and the imaging unit via the visual field adjustment shaft engaging members. The blast furnace monitoring apparatus according to any one of claims 1 to 3, wherein the visual field adjustment mechanism includes two imaging unit support members that are movably supported in an axial direction.   One of the two visual field adjustment shaft engaging members is fixed to the imaging unit, and the other visual field adjustment shaft engaging member is connected to one of the imaging unit support members. The blast furnace monitoring apparatus according to claim 4, wherein the blast furnace monitoring apparatus is a blast furnace monitoring apparatus.   6. The blast furnace according to claim 5, wherein a visual field adjustment shaft engaging member which is not connected to the visual field adjustment shaft engaging member among the two imaging unit support members is fixed to the casing. Inside monitoring device.   The imaging unit support member has a dovetail groove that fits into a dovetail fitting portion formed in the visual field adjustment shaft engaging member, and the dovetail groove is curved in an arc shape with the same radius of curvature as the curved surface. The blast furnace monitoring device according to any one of claims 4 to 6, wherein the monitoring device is a blast furnace monitoring device.   The blast furnace monitoring apparatus according to any one of claims 4 to 7, wherein the engagement hole is formed in a slit shape along the optical axis.   The imaging unit support member has a through hole formed in a circular shape with a radius larger than the amount of eccentricity of the visual field adjustment shaft, and the visual field adjustment shaft is engaged with the engagement hole through the through hole. The blast furnace monitoring apparatus according to any one of claims 4 to 8, wherein the monitoring apparatus is a blast furnace monitoring apparatus.

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