JP2022152599A - Swing chute inner surface abrasion inspection device and swing chute inner surface abrasion inspection method - Google Patents

Abstract

To provide a swing chute inner surface abrasion inspection device and a swing chute inner surface abrasion inspection method capable of quantitatively and efficiently performing a swing chute inner surface abrasion inspection at an optional time.SOLUTION: A swing chute inner surface abrasion inspection device 9 is a device for inspecting the abrasion of a surface of a liner 32 stretched on the inner surface of the chute 21 installed in a charging device 20 of a blast furnace 10 includes: a non-contact distance measuring device 42 introduced inside of the blast furnace 10 and capable of measuring a measured distance to a surface of the liner 32; and an abrasion determination unit 52 determining the abrasion of the surface of the liner 32 based on a measured distance measured by the distance measurement device 42, and as a distance measuring device 42, a charge surface shape measuring device 40 that measures the three-dimensional shape of the charge surface 24 charged into the blast furnace 10 by irradiating a microwave or millimeter wave measurement beam is also used.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a rotating chute inner surface wear inspection device and a rotating chute inner surface wear inspection method.

A charging device is installed at the top of the furnace to charge raw materials into the blast furnace. A bell type or a swirling chute type is used as a charging device, and by concentrically dispersing the charged material, a conical profile is formed on the surface of the charged material accumulated in the furnace.
Furthermore, in order to inspect whether the surface of the charge has the desired surface profile, an inspection device is introduced into the furnace from an opening near the top of the furnace and irradiated with microwave and millimeter wave measurement beams. Detecting the three-dimensional shape of the surface of the charged material by using a method (see Patent Document 1).

When the charge is spread by the charging device, the charge charged from above collides with the in-furnace chute, which is the spreading member, or friction occurs when it flows through the in-furnace chute. As a result, wear of the furnace body cannot be avoided. In order to prevent such wear of the distributing member, the inner surface of the chute is covered with a liner such as a cast liner block in which cemented carbide particles are cast (see Patent Document 2).
By covering the inner surface of the chute with a liner, it is possible to avoid wear due to the impact of the charged material. However, even wear-resistant liners inevitably wear out over time. Therefore, when the blast furnace is closed, workers visually inspect the surface of the liner through an inspection window provided near the top of the furnace to inspect the progress of wear.

JP 2019-151886 A JP-A-10-46220

Since the above-mentioned wear inspection can only be performed during a wind break once every two to three months, there is a possibility that the blast furnace operation will be affected if the wear progresses rapidly during operation.
In addition, since the inspection is a visual confirmation, it is difficult to make a quantitative judgment, and it is difficult to make a renewal judgment.
In addition, since it is visually confirmed from the opening of the furnace body, safety measures such as prevention of dropping into the furnace are more than necessary.
In particular, when visually checking the liner on the inner surface of the chute, it is necessary to stop the chute facing the opening of the furnace body.
In addition, since the furnace top manhole and the like for visual confirmation are heavy, they require multiple workers and tools, and are large-scale and costly.
In order to solve the above-described problems, it has been desired to be able to inspect the wear of the inner surface of the blast furnace at any time, quantitatively, and efficiently.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a swivel chute inner surface wear inspection device and a swivel chute inner surface wear inspection method that can quantitatively and efficiently inspect the inner surface of a swivel chute at any time.

A rotating chute inner surface wear inspection device of the present invention is a device for inspecting the wear of the inner surface of a chute installed in a charging device of a blast furnace, which can be introduced into the inside of the blast furnace and can measure the measurement distance to the inner surface. a non-contact distance measuring device, and a wear determination unit that determines wear of the inner surface based on the measured distance measured by the distance measuring device.
In the present invention, the distance measuring device is introduced into the interior of the blast furnace under the control of the wear determining section, and the measured distance to the inner surface of the chute is measured, thereby determining the wear of the inner surface of the chute based on the measured distance. can be done. Therefore, even at any time other than when the blast furnace is out of wind, quantitative inspection by mechanical measurement can be efficiently carried out.

In the revolving chute inner surface wear inspection apparatus of the present invention, a charge that measures the three-dimensional shape of the surface of the charge charged into the blast furnace by irradiating a measurement beam of microwave or millimeter wave as the distance measuring device. It is preferable to use a surface shape measuring instrument as well.
In the present invention as described above, by diverting an existing charge surface profile measuring instrument, there is no need to install a new distance measuring instrument, and implementation is easy.

In the revolving chute inner surface wear inspection device of the present invention, it is preferable that the wear determination unit performs control to place the chute in a predetermined measurement posture facing the distance measuring device.
In this aspect of the invention, the chute is placed in a predetermined measurement posture under the control of the wear determination unit, so that the relative position of the chute with respect to the distance measuring device introduced into the blast furnace can be kept constant, and measurement is always performed under the same conditions. By measuring the distance, it is possible to improve the accuracy of wear determination.
As a configuration for placing the chute in a predetermined measurement posture, the mechanisms installed in the existing charging equipment, namely, a turning mechanism for turning the chute (around the vertical axis) and a tilting mechanism for determining the inclination angle of the chute (horizontal) are used. axis) can be used.
As a predetermined measurement posture, the chute is at a turning angle position (around the vertical axis) toward the rangefinder, and the chute is tilted so that the longitudinal axis of the chute is perpendicular to the measurement beam from the rangefinder. Alternatively, it can be in a state of being in an inclined angle position (around a horizontal axis) where they intersect at an angle close to a right angle.

In the revolving chute inner surface wear inspection device of the present invention, the chute is rotatable around an axis in the extension direction of the chute, and the wear determination section controls the rotation of the chute when measuring the measurement distance. preferably.
In this aspect of the invention, by rotating the chute when measuring the measurement distance, the part to be measured by the distance measuring device can be moved across the inner surface of the chute. For example, when the measurement beam from the rangefinder is swung across the chute to scan the inner surface of the chute, the angle between the measurement beam and the inner surface is shallow near both ends of the chute, which may not be suitable for wear determination. . On the other hand, by rotating the chute, it is possible to expand the area where the crossing angle of the measurement beams is close to a right angle, and to improve the accuracy of wear determination.
As a structure for rotating the chute about the axis in the extension direction, a rotating mechanism installed in an existing charging apparatus can be appropriately used.

In the revolving chute inner surface wear inspection device of the present invention, the wear determination unit stores a reference distance to the inner surface measured in advance by the distance measuring device, and compares the measured distance with the reference distance to determine the It is preferred to determine wear on the inner surface.
In the present invention, when the inner surface of the chute is renewed, such as when the blast furnace starts operating, the distance to the inner surface of the chute without wear is measured and stored as a reference distance. By measuring and comparing with the reference distance, it is possible to properly measure the wear of the inner surface of the chute caused by operation.
The reference distance can be measured when the inner surface of the chute is updated, such as when the protective liner is replaced.

In the revolving chute inner surface wear inspection device of the present invention, the wear determining unit measures a plurality of the measured distances, selects the smallest of the measured distances as a reference distance, and selects the reference distance from the other The wear of the inner surface may be determined based on the difference from the measured distance.
In the present invention, for example, near both ends of the chute in the transverse direction, there is little or no wear, and wear increases in the central part in the transverse direction. It is possible to determine the wear by taking the difference from the measured distance of the large central portion, and to omit the process of separately preparing the reference distance in advance.

A rotating chute inner surface wear inspection method of the present invention is a method for inspecting wear of the inner surface of a chute installed in a blast furnace charging apparatus, wherein a non-contact distance measuring device is introduced into the blast furnace, and the A measured distance to the inner surface is measured by a distance measuring device, and wear of the inner surface is determined based on the measured distance.
According to this aspect of the invention, it is possible to obtain the effects as described for the swivel chute inner surface wear inspection device of the invention.

According to the present invention, it is possible to provide a swivel chute inner surface wear inspection device and a swivel chute inner surface wear inspection method capable of quantitatively and efficiently performing a swivel chute inner surface wear inspection at any time.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic diagram which shows the whole structure of 1st Embodiment of this invention. The top view which shows the chute of the said 1st Embodiment. The front view which shows the chute of the said 1st Embodiment. The schematic diagram which shows the distance measuring device of the said 1st Embodiment. 4A and 4B are schematic diagrams showing the measurement operation of the measurement distance of the first embodiment; FIG. The schematic diagram which shows the measurement distance of the said 1st Embodiment. 4 is a flow chart showing a measurement procedure of the first embodiment; The front view which shows the chute of 2nd Embodiment of this invention. The schematic diagram which shows the reference distance and measurement distance of the said 2nd Embodiment. 6 is a flow chart showing a measurement procedure of the second embodiment; Sectional drawing which shows the measurement distance and the minimum distance of 3rd Embodiment of this invention. 10 is a flow chart showing the measurement procedure of the third embodiment;

[First embodiment]
In FIG. 1, a blast furnace 10 has a furnace body 11 and a charging device 20 is installed at the furnace top 12 .
A controller 50 is connected to the blast furnace 10 . The control device 50 is composed of a computer system, and can control each part and equipment of the blast furnace 10 other than the charging device 20 based on a set program.
The charging device 20 has a revolving chute 21 inside the furnace body 11 and a charging material supply device 22 outside the furnace top 12 .

The charge 23 fed from the charge supply device 22 falls and is received by the chute 21, then flows down along the slope of the chute 21, and is dispersed inside the furnace body 11 from the tip of the chute 21. be. The charge 23 scattered from the chute 21 changes its radial position where it lands on the charge surface 24 according to the inclination angle of the chute 21 .
As shown in FIG. 2, the charge 23 spread from the chute 21 is concentrically spread by the revolving of the chute 21 and deposited inside the furnace body 11 to form a charge surface 24 .

As shown in FIG. 3, the chute 21 is connected to a pair of support members 25 on both sides of its base end, and is suspended and supported by the charge supply device 22 via the support members 25 .
The chute 21 is rotatable about the vertical axis A1 by a turning drive mechanism (not shown), and the chute 21 is turned by this.
In addition, the chute 21 can also rotate the support member 25 around the horizontal axis A2 by a tilting drive mechanism (not shown), thereby performing a tilting operation for adjusting the tilt angle of the chute 21 .

The axis A3 in the extending direction of the chute 21 changes from substantially horizontal to substantially vertically downward due to the tilting motion of the chute 21 .
The turning motion, tilting motion, and rotating motion of these chutes 21 are controlled by the control device 50 respectively.

The inner surface of the chute 21 is lined with a liner 32, such as a cast liner block with cemented carbide particles.
Forming the inner surface of the chute 21 with the liner 32 suppresses abrasion of the chute 21 due to collision or flowing down of the charge 23 . However, the wear of the liner 32 due to the charging material 23 cannot be eliminated, and the liner 32 is replaced when wear is determined by periodic inspection.

As also shown in FIGS. 1 and 4, the furnace body 11 is provided with a charge surface shape measuring device 40 .
The charge surface shape measuring instrument 40 has a measuring instrument main body 41 that can be introduced into the furnace from the opening 14 of the furnace body 11, and a distance measuring instrument 42 is installed at the tip thereof.
The distance measuring device 42 is an existing non-contact distance measuring device that irradiates an object to be measured with measurement beams 43 and 44 of microwaves or millimeter waves and detects the beams reflected by the object to be measured, and measures the distance to the object to be measured. It is measurable.
The distance measuring device 42 is normally placed inside the blast furnace 10 during operation or even when the air is not blown, and is retracted outside the furnace as necessary, such as when conditions inside the furnace differ from normal conditions.

A surface profile measuring section 51 is formed in the control device 50 .
The surface profile measuring unit 51 controls the distance measuring device 42 to irradiate the charge surface 24 with the measurement beam 43 and scan the charge surface 24 to determine the three-dimensional shape of the charge surface 24 (charge object surface shape) can be measured.
The resulting three-dimensional shape of the charge surface 24 is referenced by the controller 50 in controlling the charging operation of the charging device 20 .

A wear determination unit 52 is further formed in the control device 50 .
The wear determining unit 52 can determine the wear of the surface of the liner 32 by controlling the distance measuring device 42 to irradiate the inner surface of the chute 21 with the measurement beam 44 and measuring the distance to the surface of the liner 32. .
As shown in FIG. 4 , when performing the determination, the wear determination unit 52 rotates the chute 21 to face the distance measuring device 42 and tilts the chute 21 to measure the extension direction of the chute 21 and the wear determination unit 52 . The chute 21 is arranged at an angle substantially orthogonal to the beam 44, thereby setting the chute 21 in a predetermined measurement posture.

As a predetermined measurement posture, the chute 21 is at the turning angle position (around the vertical axis A1) toward the distance measuring device 42, and the inclination angle position (around the horizontal axis A2) of the chute 21 is the extension direction of the chute 21. and the measuring beam 44 from the distance measuring device 42 intersect at a right angle or an angle close to a right angle.
As shown in FIG. 5, by changing the irradiation angle of the measurement beam 44 and the tilt angle of the chute 21 while maintaining the above-described predetermined measurement posture, the irradiation position of the measurement beam 44 with respect to the surface of the liner 32 can be adjusted to the chute. It can be changed over a predetermined length from the base end side of the chute 21 to the tip end side of the chute 21 .
By performing such a measurement operation, the measured distance Dt can be intermittently or continuously measured at a plurality of points in the range from one end to the other end of the surface of the liner 32, and the measured distance Dt can be measured. The distance Dt is stored as the measured shape Pt of the range from one end of the surface of the liner 32 to the other end.

As shown in FIG. 6, in the measurement shape Pt from the proximal end side to the distal end side of the liner 32, there is a valley with a large measurement distance Dt near the proximal end, and a shallow region continues toward the distal end side. This is because the charge 23 fed from the charge supply device 22 drops in the vicinity of the base end of the chute 21 and the surface of the liner 32 is greatly worn. As the charge 23 received by the liner 32 flows down toward the tip side of the chute 21, the surface of the liner 32 is worn, but the degree of wear is smaller in this area than near the base end.
On the other hand, at the proximal end of the liner 32, the charge 23 is less likely to fall, and the wear of the surface of the liner 32 is the smallest. Therefore, this minimum measured distance Dt can be used as the reference distance Dr. Then, the difference Wt=Dt−Dr between the selected reference distance Dr and the reference distance Dr at another point recorded in the measured shape Pt is sequentially calculated. If the wear determination value Ws is exceeded, it can be determined that replacement or the like is necessary due to wear.

In this way, the wear determining unit 52 sets the smallest one of the plurality of measured distances Dt recorded in the measured shape Pt as the reference distance Dr, and compares the other measured distances Dt to the difference Wt at each position. By calculating =Dt-Dr, the wear at each point can be measured. Then, by comparing the obtained difference Wt at each point with the predetermined wear determination value Ws of the liner 32, it is possible to determine that the liner 32 is in a worn state and needs to be replaced if it exceeds this value.
The revolving chute inner surface wear inspection device 9 of the present invention is configured by the distance measuring device 42 and the wear determination unit 52 .

In FIG. 7, the following operations are performed in this embodiment.
When the blast furnace 10 is in an operating state (including during operation or during shutdown) (process P1), the control device 50 maintains the operation until the execution timing of the wear inspection (process P2). When instructed by the user or when the regular execution time comes, the control device 50 transfers control to the wear determination unit 52, and the wear determination unit 52 executes the wear determination operation (processes P3 to P6).

In the wear determination operation, the wear determination unit 52 places the chute 21 in a predetermined measurement posture (process P3).
Subsequently, the wear determination unit 52 changes the irradiation angle of the measurement beam 44 while changing the tilt angle of the chute 21, and while maintaining the state in which the measurement beam 44 is substantially perpendicular to the axis A3 in the extension direction, Measured distances Dt to the surface of the liner 32 are measured at a plurality of points from the base end side to the tip side, and stored as a measured shape Pt indicating the transverse shape of the inner surface of the chute 21 (process P4).

The wear determining unit 52 selects the smallest one of the plurality of measured distances Dt recorded in the obtained measured shape Pt as the reference distance Dr (process P5).
Then, the difference Wt=Dt−Dr between the selected reference distance Dr and the measured distance Dt of the other point recorded in the measured shape Pt is sequentially calculated. If the wear determination value Ws is exceeded, it is determined that replacement or the like is necessary due to wear.
After completing the friction determination, the wear determination unit 52 returns control to the control device 50 .

According to this embodiment, the following effects can be obtained.
In this embodiment, by measuring the measured distance Dt to the inner surface of the chute 21 with the distance measuring device 42 introduced inside the blast furnace 10, the surface of the liner 32 stretched on the inner surface of the chute 21 is measured based on the measured distance Dt. wear can be determined. Therefore, even at any time other than when the blast furnace 10 is out of wind, quantitative inspection by mechanical measurement can be efficiently carried out.

In this embodiment, as the distance measuring device 42, a charge surface shape measuring device 40 that measures the three-dimensional shape of the charge surface 24 charged into the blast furnace 10 by irradiating a microwave or millimeter wave measurement beam. , there is no need to install a new distance measuring device, and implementation is easy.
In the present embodiment, by placing the chute 21 in a predetermined measurement posture under the control of the wear determination unit 52, the relative position of the chute 21 with respect to the distance measuring device 42 introduced into the blast furnace 10 can be made constant and always the same. By measuring the measurement distance Dt under certain conditions, it is possible to improve the accuracy of wear determination.

In this embodiment, the wear determination unit 52 measures a plurality of measured distances Dt, selects the smallest measured distance Dt as the reference distance Dr, and determines the difference between the reference distance Dr and the other measured distances Dt. Since the wear of the surface of the liner 32 is determined based on the difference Wt, it is possible to easily set the reference distance Dr as a reference for comparison determination.

[Second embodiment]
A second embodiment of the present invention is shown in FIGS. 8-10.
This embodiment has the same basic configuration as the swivel chute inner surface wear inspection device 9 of the first embodiment described above, so redundant description of the common configuration will be omitted, and only differences will be described below.
In the first embodiment described above, the distance to the liner 32 is measured along the extension direction of the chute 21 (axis A3 direction), and the change in the amount of wear of the liner 32 along the same direction is detected.
In contrast, in the present embodiment, the distance to the liner 32 is measured along the transverse direction of the chute 21 (the direction of the axis A2), and the change in the amount of wear of the liner 32 along the same direction is detected.

In the charging device 20 of this embodiment, the chute 21 is rotatable about the axis A3 in its extension direction by a chute rotating mechanism (not shown). The rotation angle of the chute 21 in this case is 360 degrees .
Furthermore, the wear determination unit 52 of the present embodiment can irradiate the measurement beam 44 on both side regions of the liner 32 at right angles as much as possible by rotating the chute 21 around the axis A3 in the extension direction.

4, by rotating the chute 21 around the axis A3 while irradiating the measurement beam 44 from the distance measuring device 42, the inner surface of the liner 32 shown in FIG. It is possible to scan and measure the distance to the surface of liner 32 from the "-90 degrees" direction through the "0 degrees" direction to the "+90 degrees" direction. The measured distance can be represented as a developed graph shown in FIG.
In the graph of FIG. 9, the "-90 degrees" position on the left end indicates the "-90 degrees" side end of the liner 32 in FIG. 8, and the "+90 degrees" position on the right side indicates the " -90 degrees” side end.

As shown in FIG. 9A, when the liner 32 is new and not worn, the surface of the liner 32 is the new surface 321 . By rotating the chute 21 while irradiating the new surface 321 with the measurement beam 44, the reference distance Ds is measured intermittently or continuously at a plurality of points in the range from one end to the other end of the new surface 321. can be measured. The resulting plurality of reference distances Ds can be recorded as a reference shape Ps, the transverse shape from one end of the new surface 321 to the other.

As shown in FIG. 9(B), the new surface 321 is abraded and changed into surfaces 322 and 323 as the charge 23 is introduced. The wear of the surfaces 322 and 323 is conspicuous in the transverse central portion (near the 0 degree direction) of the chute 21, which is the bottom of the chute 21 in the normal posture, and the wear of the chute 21, which is the side of the chute 21 in the normal posture. There is less wear at the transverse ends (near the -90 and +90 degree directions).

As shown in FIG. 9C, by rotating the chute 21 while irradiating the measurement beam 44 on the worn surface 323, the area from one end of the surface 323 to the other end is measured. The measurement distance Dt can be measured intermittently or continuously at multiple points. The resulting plurality of measured distances Dt can be recorded as a measured profile Pt, ie a transverse profile across the surface 323 from one end to the other.

In the wear determination unit 52, for a plurality of measured distances Dt recorded in the measured shape Pt, the reference distances Ds at the corresponding points are selected from the reference shape Ps, and the difference Wt=Dt−Ds is calculated. , the wear at each point can be measured. The obtained difference Wt is compared with a predetermined wear determination value Ws of the liner 32, and if it exceeds this, it can be determined that the liner 32 is worn and needs to be replaced.
The revolving chute inner surface wear inspection device 9 of the present invention is configured by the distance measuring device 42 and the wear determination unit 52 .

In FIG. 10, the following operations are performed in this embodiment.
When the blast furnace 10 is in a trial operation state after being newly constructed or refurbished (process P10), the control device 50 transfers control to the wear determination unit 52 according to an external command or predetermined timing, and the wear determination unit 52 performs the reference shape measurement operation. (Processes P11 to P16) are executed.

In the reference shape measurement operation, the wear determination unit 52 places the chute 21 in a predetermined measurement posture (process P11).
Subsequently, the wear determination unit 52 selects a measurement position on the axis A3, which is the extension direction of the chute 21 (process P12). At least one measurement position is arranged for each liner 32 stretched over the chute 21 .
After selecting the measurement position, the reference distance Ds to the surface of the liner 32 is measured by the distance measuring device 42 (process P13), and is stored as the reference shape Ps indicating the cross-sectional shape of the inner surface of the chute 21 (process P14). In the reference shape Ps for each measurement position, the reference distances Ds of a plurality of points in the transverse direction of the chute 21 are stored together with the transverse position of the chute 21 (angular position about the axis A3).
After measuring the reference shape Ps (including a plurality of reference distances Ds) for one measurement position, it is determined whether there is an unmeasured measurement position (process P15), and if there is, the next measurement position is selected ( Process P12) and similar processes P13 to P15 are repeated.

When there are no more unmeasured measurement positions in process P15, the wear determination unit 52 returns control to the control device 50. FIG.
When the blast furnace 10 is in operation (including during operation or when the wind is not blowing) (process P20), the control device 50 maintains the operation until the execution timing of the wear inspection (process P21). When instructed by the user or when the regular execution time comes, the control device 50 transfers control to the wear determination unit 52, and the wear determination unit 52 executes the wear determination operation (processes P22 to P27).

In the wear determination operation, the wear determination unit 52 places the chute 21 in a predetermined measurement posture (process P22).
Subsequently, the wear determination unit 52 selects a measurement position on the axis A3 that is the extension direction of the chute 21 (process P23), and measures the measurement distance Dt from the selected measurement position to the surface of the liner 32 (process P24 ), and stored as a measured shape Pt indicating the transverse shape of the inner surface of the chute 21 (process P25). In the measurement shape Pt for each measurement position, the measured distances Dt of a plurality of points in the transverse direction of the chute 21 are stored together with the transverse position of the chute 21 (angular position about the axis A3).

The wear determining unit 52 compares the measured distance Dt of each point of the obtained measured shape Pt with the reference distance Ds of the corresponding point of the previously stored reference shape Ps, and determines the difference Wt at each point. =Dt-Ds is calculated, and if any of the differences Wt is greater than a preset wear determination value Ws, it is determined that the liner 32 including that point is worn (process P26).
When the wear inspection for one measurement position is completed, the wear determination unit 52 determines whether there is an unmeasured measurement position (process P27), selects the next measurement position if there is (process P23), and performs similar operations. Processes P24 to P27 are repeated.
When there are no more unmeasured measurement positions in process P27, the wear determination unit 52 returns control to the control device 50. FIG.
The controller 50 returns to the operation of the blast furnace 10 (processes P20-P21).

According to this embodiment, the same effects as those of the above-described first embodiment can be obtained, and the following effects can be obtained.

In this embodiment, when measuring the measurement distance Dt, the chute rotation mechanism 28 rotates the chute 21 around the axis A3 so that the part to be measured by the distance measuring device 42 traverses the inner surface of the chute 21. can be transferred to For example, when the measuring beam 44 from the distance measuring device 42 is swung across the chute 21 to scan the inner surface of the chute 21, the measuring beam 44 forms a shallow angle with respect to the inner surface in the vicinity of both ends of the chute 21, making it difficult to determine wear. may not be preferred. On the other hand, by rotating the chute 21, it is possible to expand the area where the crossing angle of the measurement beams 44 is close to a right angle, and to improve the accuracy of wear determination.
As a structure for rotating the chute 21 around the axis A3 in the extension direction, the chute rotation mechanism 28 installed in the existing charging apparatus 20 can be used, and complication of the apparatus can be avoided. .

In the present embodiment, the inner surface of the chute 21 is renewed when the blast furnace 10 starts operating, that is, the distance to the inner surface of the chute 21 that is not worn, that is, the surface of the new liner 32 (new surface 321 in FIG. 9) is measured and stored as the reference distance Ds, and the measured distance Dt is measured after the operation is completed and compared with the reference distance Ds, so that the wear of the liner 32 caused by the operation can be properly measured.

[Third Embodiment]
11 and 12 show a third embodiment of the invention.
This embodiment has the same basic configuration as the revolving chute inner surface wear inspection device 9 of the second embodiment described above, so redundant description of the common configuration will be omitted, and only differences will be described below.
In the above-described second embodiment, the chute 21 is rotated about the axis A3 while the measurement beam 44 is irradiated, the reference distance Ds of the non-worn liner 32 is measured, and the measured distance Dt of the worn liner 32 is measured. Wear was determined by the difference Wt.
On the other hand, in the present embodiment, the chute 21 is rotated about the axis A3 while the measurement beam 44 is emitted, but the minimum measured distance Dt is selected as the reference distance Dr. Wear is determined based on the difference Wt=Dt-Dr between the reference distance Dr and another measured distance Dt.

As shown in FIG. 11(A), the new surface 321 is abraded and changed to surfaces 322 and 323 by introducing the charge 23 (similar to FIG. 9(B) of the second embodiment). .
As shown in FIG. 11B, by rotating the chute 21 while irradiating the measurement beam 44 on the worn surface 323, the area from one end of the surface 323 to the other end is measured. The measured distances Dt are intermittently or continuously measured at a plurality of points, and the obtained plurality of measured distances Dt are recorded as the measured shape Pt (similar to FIG. 9C of the second embodiment).

Here, the abrasion of the surface 323 is conspicuous in the transverse central portion (near the 0 degree direction) of the chute 21, which is the bottom portion of the chute 21 in the normal posture, and the measured distance Dt becomes relatively large.
On the other hand, both lateral end portions of the chute 21 (near the −90 degree direction and the +90 degree direction), which are the side portions of the chute 21 in the normal posture, are less worn and the measured distance Dt is smaller.

As shown in FIG. 11(C), the wear determining unit 52 selects the smallest measured distance Dt recorded in the measured shape Pt as the reference distance Dr. This is usually the measured distance Dt measured at the transverse ends of the chute 21 .
A difference Wt=Dt−Dr between the selected reference distance Dr and the measured distance Dt at another point recorded in the measured shape Pt is sequentially calculated, and one of the obtained differences Wt is the predetermined wear of the liner 32. If the determination value Ws is exceeded, it can be determined that the wear state requires replacement or the like.

In FIG. 12, the following operations are performed in this embodiment.
When the blast furnace 10 is in operation (including during operation or when the wind is not blowing) (process P30), the control device 50 maintains the operation until the execution timing of the wear inspection (process P31). When instructed by the user or when the regular execution time comes, the control device 50 transfers the control to the wear determination section 52, and the wear determination section 52 executes the wear determination operation (processes P32 to P38).

In the wear determination operation, the wear determination unit 52 places the chute 21 in a predetermined measurement posture (process P32).
Subsequently, the wear determining unit 52 selects a measurement position on the axis A3, which is the extension direction of the chute 21 (process P33), and measures the measurement distance Dt from the selected measurement position to the surface of the liner 32 (process P34). ), and stored as a measured shape Pt indicating the transverse shape of the inner surface of the chute 21 (process P35). In the measurement shape Pt for each measurement position, the measured distances Dt of a plurality of points in the transverse direction of the chute 21 are stored together with the transverse position of the chute 21 (angular position about the axis A3).

The wear determining unit 52 selects the smallest one of the plurality of measured distances Dt recorded in the obtained measured shape Pt as the reference distance Dr (process P36).
Then, the difference Wt=Dt−Dr between the selected reference distance Dr and the measured distance Dt of the other point recorded in the measured shape Pt is sequentially calculated. If the wear determination value Ws is exceeded, it is determined that replacement or the like is necessary due to wear.

After finishing the wear inspection for one measurement position, the wear determination unit 52 determines whether there is an unmeasured measurement position (process P38), selects the next measurement position if there is (process P33), and performs the same operation. Processes P34 to P37 are repeated.
When there are no more unmeasured measurement positions in process P37, the wear determination unit 52 returns control to the control device 50. FIG.
The controller 50 returns to the operation of the blast furnace 10 (processes P30-P31).

According to this embodiment, the same effects as those of the second embodiment described above can be obtained. , the process of measuring the reference distance Ds in advance and storing it as the reference shape Ps in the second embodiment is not required, and the process can be simplified more than the second embodiment.

[Other embodiments]
It should be noted that the present invention is not limited to the above-described embodiments, and includes modifications within the scope of achieving the object of the present invention.
In the above-described embodiment, as the distance measuring device 42, a charge surface profile measuring device that measures the three-dimensional shape of the charge surface 24 charged into the blast furnace 10 by irradiating a microwave or millimeter wave measurement beam 43. 40 is also used, but a non-contact distance measuring device or the like with a different measurement principle may be installed exclusively.
In the above-described embodiment, the liner 32 is installed inside the chute 21 and its surface is used as the inner surface of the chute 21. However, the liner 32 is omitted and the surface of the chute 21 itself is used as the inner surface of the chute 21 for wear inspection. good too.

INDUSTRIAL APPLICABILITY The present invention can be used for a rotating chute inner surface wear inspection device and a rotating chute inner surface wear inspection method.

9... Turning chute inner surface wear inspection device, 10... Blast furnace, 11... Furnace body, 12... Furnace top, 14... Opening, 20... Charging device, 21... Chute, 22... Charge supply device, 23... Charging Material 24 Charge surface 32 Liner 321 New surface 322, 323 Surface 40 Charge surface shape measuring instrument 41 Measuring instrument body 42 Distance measuring instrument 43, 44 Measuring beam 50 Control device 51 Surface profile measuring unit 52 Wear determining unit A1 Axis of turning operation A2 Axis of tilting operation A3 Axis in chute extending direction Ds, Dr Reference distance , Dt: measured distance, Ps: reference shape, Pt: measured shape, Ws: wear determination value, Wt: difference.

In the revolving chute inner surface wear inspection device of the present invention, it is preferable that the wear determination section performs control to dispose the chute in a predetermined measurement posture facing the distance measuring device.
In this aspect of the invention, the chute is placed in a predetermined measurement posture under the control of the wear determination unit, so that the relative position of the chute with respect to the distance measuring device introduced into the blast furnace can be kept constant, and measurement is always performed under the same conditions. By measuring the distance, it is possible to improve the accuracy of wear determination.
As a configuration for placing the chute in a predetermined measurement posture, the mechanisms installed in the existing charging equipment, namely, a turning mechanism for turning the chute (around the vertical axis) and a tilting mechanism for determining the inclination angle of the chute (horizontal) are used. axis) can be used.
As a predetermined measurement posture, the chute is at a turning angle position (around the vertical axis) toward the rangefinder, and the chute is tilted so that the longitudinal axis of the chute is perpendicular to the measurement beam from the rangefinder. Alternatively, it can be in a state of being in an inclined angle position (around a horizontal axis) where they intersect at an angle close to a right angle.

Claims (7)

A device for inspecting wear of the inner surface of a chute installed in a blast furnace charging device,
a non-contact distance measuring device that can be introduced into the interior of the blast furnace and that can measure the measurement distance to the inner surface;
a wear determination unit that determines wear of the inner surface based on the measured distance measured by the distance measuring device. In the revolving chute inner surface wear inspection device according to claim 1,
The inner surface of the revolving chute, which also serves as the distance measuring instrument as a charge surface shape measuring instrument for measuring the three-dimensional shape of the surface of the charge charged into the blast furnace by irradiating it with a microwave or millimeter wave measurement beam. Abrasion inspection device. In the revolving chute inner surface wear inspection device according to claim 1 or claim 2,
The inner surface wear inspection device of the revolving chute, wherein the wear determination unit performs control to place the chute in a predetermined measurement posture facing the distance measuring device. In the revolving chute inner surface wear inspection device according to claim 3,
The rotating chute inner surface wear inspection device, wherein the chute is rotatable around an axis in an extension direction of the chute, and the wear determination section performs control to rotate the chute when measuring the measurement distance. In the revolving chute inner surface wear inspection device according to any one of claims 1 to 4,
The wear determination unit stores a reference distance to the inner surface measured in advance by the distance measuring device, and compares the measured distance with the reference distance to determine wear of the inner surface of the revolving chute. inspection equipment. In the revolving chute inner surface wear inspection device according to any one of claims 1 to 4,
The wear determination unit measures a plurality of the measured distances, selects the smallest of the measured distances as a reference distance, and wears the inner surface based on the difference between the reference distance and the other measured distances. A swivel chute inner surface wear inspection device that determines the wear of the A method for inspecting the wear of the inner surface of a chute installed in a blast furnace charging apparatus, comprising:
introducing a non-contact distance measuring device inside the blast furnace,
Measure the measured distance to the inner surface with the distance measuring device,
A swivel chute inner surface wear inspection method for determining wear of the inner surface based on the measured distance.

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