JP2010163647A - Method for correcting meandering of slab in heating furnace - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for correcting a meandering of a slab in a heating furnace by which the meandering of the slab can easily be corrected in a short period of time. <P>SOLUTION: In the method for correcting the meandering of the slab when the slab 12 is conveyed in the walking-beam type heating furnace 15, the difference between the upper surface height positions of respective eccentric wheels 45, 46 constituting an eccentric wheel group 47 causing the meandering of the slab 12, is obtained by actual measurement for every eccentric wheel group 47, and the meandering locus of the slab 12 is simulated based on the difference. When the measuring locus is in the out of the allowable range, the upper surface height positions of the eccentric wheels 45, 46 constituting at least one eccentric wheel group 47 are corrected. Then a process, in which the meandering locus of the slab 12 is simulated again by again obtaining the upper surface height positions of the respective eccentric wheels 45, 46 according to the corrected upper surface height positions, are repeatedly performed until the meandering locus of the slab 12 becomes the allowable range. Thus, the upper surface height positions of the eccentric wheels 45, 46 are adjusted based on the simulated result. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a method for correcting meandering of a slab conveyed in a walking beam type heating furnace.

Conventionally, a walking beam type heating furnace is used as a furnace for heating a slab. In this heating furnace, a plurality of movable beams and fixed beams are arranged in the longitudinal direction in the furnace longitudinal direction of the heating furnace, and arranged side by side with an interval in the furnace width direction. A plurality of eccentric rings, each composed of a plurality of eccentric rings (also referred to as eccentric rings) arranged in the width direction outside the furnace, are provided at predetermined intervals in the longitudinal direction outside the furnace of each movable beam. Thereby, by driving each eccentric wheel synchronously, each movable beam repeats the operation of ascending, advancing, descending, and retreating so that the slab in the heating furnace can be conveyed in the longitudinal direction of the furnace.
When a slab is transported in such a heating furnace, the slab may meander, for example, the slab may fall from a fixed beam or a movable beam, or may contact the furnace wall of the heating furnace and damage the furnace wall. There was a possibility that the productivity of the product would be lowered and the damage to the equipment would be increased.
Therefore, as a method for confirming the meandering state of the slab in the heating furnace, a technique for directly photographing the inside of the heating furnace and confirming the meandering state of the slab in the heating furnace is disclosed (for example, see Patent Document 1).

JP 2007-254789 A

However, even if the meandering situation of the slab in the heating furnace is known, how to adjust each movable beam will quantitatively predict how the meandering situation of the slab will change in the heating furnace. It was difficult to correct the meandering of the slab accurately.

This invention is made | formed in view of this situation, and it aims at providing the slab meandering correction method in a heating furnace which can implement the slab meandering correction easily in a short time.

The gist of the present invention made to solve the above problems is as follows.
(1) A plurality of movable beams provided in a plurality of movable beams arranged side by side in the furnace width direction of the walking beam type heating furnace for heating the slab, and arranged in the width direction outside the furnace of the heating furnace. By providing a plurality of eccentric rings composed of eccentric rings at a predetermined interval in the longitudinal direction outside the furnace of each movable beam, each movable beam is lifted, moved forward, lowered, and moved backward by synchronously driving each eccentric wheel. A method of correcting the meandering of the slab that occurs when the slab in the heating furnace is conveyed in the longitudinal direction of the furnace by repeating the operation of
The difference in the upper surface height position of each eccentric wheel constituting the eccentric wheel group that causes the meandering of the slab is obtained by actual measurement for each eccentric wheel group, and the difference in the heating furnace is determined based on the difference. If the meandering locus of the slab is simulated, and if the meandering locus of the slab is outside the preset allowable range, the height position of the upper surface of the eccentric wheel constituting at least one eccentric wheel group is corrected and corrected. The step of re-determining the difference in the upper surface height position of each eccentric wheel according to the upper surface height position, and re-simulating the meandering locus of the slab based on the difference, the meandering locus of the slab is within the allowable range. The method of correcting the slab meandering in the heating furnace is characterized in that it is repeatedly performed until the upper surface height position of the eccentric ring is adjusted based on the simulation result.

(2) The difference in the upper surface height position of each eccentric wheel constituting the eccentric wheel group is the upper surface of each eccentric wheel when the movable beam comes into contact with the lower surface of the slab during the ascent of each movable beam. Measure the height position A and the upper surface height position B of each eccentric wheel when the movable beam is separated from the lower surface of the slab during the descent of the movable beam, and obtain them based on the measured values. The slab meandering correction method in a heating furnace as described in (1) characterized by these.

(3) The contact of the movable beam with the lower surface of the slab and the separation of the movable beam from the lower surface of the slab are the rotation angle positions of the eccentric wheels set in advance or the slab provided on the movable beam. The slab meandering correction method in a heating furnace according to (1) or (2), wherein detection is performed based on detection information of the load detector.
Here, the preset rotation angle position of each eccentric wheel is, for example, (a) the upper surface height position of each eccentric wheel when this movable beam comes into contact with the lower surface of the slab during the ascent of the movable beam, and the movable Angular position at the upper surface height position of each eccentric wheel when this movable beam leaves the lower surface of the slab during beam descent, (b) Timing close to the timing at which the movable beam contacts or separates from the lower surface of the slab Angle position).
In addition, a load cell or the like can be used for the load detector, and using this, detection information that the movable beam has contacted the lower surface of the slab (that is, a load is generated), or detection information that is separated from the lower surface of the slab (that is, The difference in the upper surface height position of each eccentric ring can also be obtained based on (no load applied).

(4) The adjustment of the top surface height position of the eccentric wheel based on the corrected top surface height position of the eccentric wheel is performed by adjusting the phase of the eccentric wheel (1) to (3) To correct the slab meandering in the furnace.
(5) The correction of the upper surface height position of the eccentric wheel group constituting the eccentric wheel group is based on the upstream side of the eccentric wheel group in which the meandering amount of the slab becomes the largest when the meandering locus of the slab is simulated. In addition, the slab meandering correction method in a heating furnace according to any one of (1) to (4), wherein the slab meandering is performed on the eccentric wheel constituting the eccentric wheel group that causes the slab to meander most greatly.
(6) One side in the furnace width direction of the elevating frame in which each movable beam is provided, and the lower surface thereof contacts each eccentric wheel, with respect to the difference in the upper surface height position of each eccentric wheel constituting each eccentric wheel group The slab meandering correction method in the heating furnace according to any one of (1) to (5), characterized in that the measurement is performed by a laser displacement meter provided in the slab.

Since the slab meandering correction method in the heating furnace according to the present invention is obtained by actually measuring the difference in the upper surface height position of each eccentric wheel constituting the eccentric wheel group that causes the slab meandering for each eccentric wheel group. From the difference, the inclination state of the movable beam can be estimated, and the amount of slab displacement can be obtained for each location where each eccentric wheel group is installed. Thereby, between the adjacent eccentric wheel groups, for example, the amount of deviation described above can be integrated, and the slab meandering trajectory in the heating furnace can be simulated, so without directly confirming the state of conveyance of the slab in the heating furnace, Predict the slab meandering situation.
If the meandering trajectory of the slab is outside the allowable range, the upper surface height position of the eccentric wheel constituting at least one eccentric wheel group is corrected, and a new calculation is newly performed according to the corrected upper surface height position. The process of re-simulating the slab meandering trajectory is repeated until the slab meandering trajectory is within the allowable range based on the difference in the height of the top surface of each eccentric wheel. Can be implemented.

Further, the difference in the upper surface height position of each eccentric wheel constituting the eccentric ring group is determined by calculating the upper surface height position A of each eccentric wheel when this movable beam comes into contact with the lower surface of the slab in the course of ascending each movable beam, When the movable beam is separated from the lower surface of the slab during the descent of the movable beam, the upper surface height position B of each eccentric wheel is measured, and when it is obtained based on this measurement value, each eccentricity that causes the meandering of the slab. It is possible to accurately obtain the difference in the height position of the upper surface of the ring.
In addition, the contact of the movable beam to the lower surface of the slab and the separation from the lower surface of the slab are detected based on the preset rotation angle position of each eccentric wheel or the detection information of the load detector of the slab provided on the movable beam. In this case, it is possible to easily detect the difference in the upper surface height position of each eccentric ring that causes the slab to meander.

Then, when the adjustment of the top surface height position of the eccentric wheel based on the corrected top surface height position of the eccentric wheel is performed by adjusting the phase of the eccentric wheel, the meandering correction of the slab can be facilitated.
In addition, when correcting the upper surface height position of the eccentric rings constituting the eccentric ring group, when the slab meandering trajectory was simulated, the slab was the most upstream on the upstream side of the eccentric ring group where the slab meandering amount was the largest. When performing on an eccentric wheel that makes up a large meandering group, the slab meandering correction is performed at a location where the effect of correcting the upper surface height position of the eccentric ring is large, so that the correction effect appears prominently and shortened. Correction in time is possible.
Furthermore, the difference in the upper surface height position of each eccentric wheel constituting each eccentric wheel group is determined by laser displacement provided on one side in the furnace width direction of the lifting frame where each movable beam is provided and its lower surface contacts each eccentric wheel. When measuring with a meter, high-precision measurement can be easily performed with a simple configuration.

It is a front sectional view of the walking beam type heating equipment to which the method for correcting slab meandering in a heating furnace according to an embodiment of the present invention is applied. It is a sectional side view of the walking beam type heating equipment. (A), (B) is the top view and side view of the drive mechanism of the movable beam of the same walking beam type heating equipment, respectively. (A), (B) is the elements on larger scale of the drive mechanism, respectively, and the elements on larger scale of the gear coupling part of the same drive mechanism. (A)-(D) are explanatory drawings which show the generation | occurrence | production process of a slab meander. It is explanatory drawing of the simulation content of the meandering locus | trajectory of a slab. It is explanatory drawing which shows the simulation result of the meandering locus | trajectory of the slab before correction. It is explanatory drawing which shows the simulation result of the meandering locus | trajectory of the slab after correction.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
First, the walking beam type heating equipment 10 to which the method for correcting the slab meander in the heating furnace according to the embodiment of the present invention is described, and then the slab meander correction in the heating furnace according to the embodiment of the present invention is described. A method will be described.
As shown in FIGS. 1 and 2, a walking beam type heating facility (hereinafter also simply referred to as a heating facility) 10 includes a refractory 11 lined, a carry-in port 13 for carrying a slab 12, and a heated slab 12. It has the heating furnace (namely, heating furnace main body) 15 provided with the carrying-out port 14 which carries out unloading. The slab 12 is heated by a burner (not shown) disposed in the heating furnace 15.
The longitudinal direction of the heating furnace 15 coincides with the conveyance direction of the slab 12, and the width direction of the heating furnace 15 coincides with the direction orthogonal to the conveyance direction of the slab 12. Further, the slab 12 is carried in such a manner that its longitudinal direction is directed to the width direction of the heating furnace 15.

In the heating furnace 15, a plurality of (in this case, two) fixed beams 16 and 17 for mounting and supporting the slab 12 are aligned in the longitudinal direction of the furnace (in the conveying direction of the slab 12). ) And in parallel with a gap in the width direction of the furnace. The fixed beams 16 and 17 include a long fixed mounting portion 18 arranged along the longitudinal direction of the furnace 15 and a plurality of fixed support portions 19 that support the fixed mounting portion 18. Have.
Between the fixed beams 16 and 17, a plurality of (here, two) movable beams 20 and 21 on which the slab 12 is placed are arranged in parallel with a distance from the fixed beams 16 and 17. ing. The movable beams 20 and 21 also have a long movable mounting portion 22 arranged along the longitudinal direction of the furnace 15 and a plurality of movable support portions 23 that support the movable mounting portion 22. is doing.
The lower part of each movable support portion 23 of each movable beam 20, 21 is disposed in a cavity 25 below (outside the furnace) of the heating furnace 15 through a through hole 24 formed in the lower part of the heating furnace 15. The lift frame 26 is erected on both sides in the width direction.

The elevating frame 26 has an integral structure over the longitudinal direction outside the furnace of the heating furnace 10, and is moved up and down by a plurality of drive mechanisms (cam mechanisms) 27 arranged in the cavity 25.
As shown in FIGS. 1 to 4, each drive mechanism 27 includes power transmission gears 30 and 31 that send power from the drive motor 28 to the lifting frame 26 via a power transmission shaft 29. Intermediate shafts 32 and 33 are arranged on both sides of the power transmission gears 30 and 31 with their axis centers (also referred to as shaft cores) aligned, and the rotation shafts to which the intermediate shafts 32 and 33 and pinions 34 and 35 are attached. 36 and 37 are attached and fixed via gear couplings 38 and 39 with their axes aligned. As shown in FIGS. 4A and 4B, the gear couplings 38 and 39 are provided with gears on the intermediate shafts 32 and 33 side and provided with only bosses on the rotary shafts 36 and 37 side. It is configured to be fixed with a plurality of bolts 40.

Large gears 41 and 42 are screwed into the pinions 34 and 35, respectively, and eccentric wheels 45 and 46 are attached to rotary shafts 43 and 44 to which the large gears 41 and 42 are attached. The rotation shafts 43 and 44 are attached with their shaft centers shifted from the rotation centers of the eccentric wheels 45 and 46.
The eccentric wheels 45 and 46 are in contact with the lower surfaces of both sides of the elevating frame 26 in the furnace width direction.
The eccentric wheels 45 and 46 are arranged at intervals on both sides in the outside width direction of the furnace below the heating furnace 15, and the eccentric wheel group 47 constituted by the eccentric wheels 45 and 46 is connected to each movable beam. A plurality are provided at predetermined intervals (for example, about 5 to 10 m) in the longitudinal direction of 20 and 21.
As a result, each of the movable beams 20 and 21 is provided with a plurality of eccentric wheels 45 and 46 via the lifting frame 26, so that the eccentric wheels 45 and 46 are driven in synchronization by the power from the drive motor 28. The frame 26 can be moved up and down and moved forward and backward by a cylinder 48. Accordingly, each movable beam 20, 21 repeats the operation of ascending, advancing, descending, and retreating. Therefore, the slab 12 is alternately placed on the fixed beams 16, 17 and the movable beams 20, 21, and the carry-out port of the heating furnace 15 14 can be transported.

Next, a slab meandering correction method in a heating furnace according to an embodiment of the present invention will be described with reference to a walking beam type heating facility 10.
By driving each eccentric wheel 45 and 46 synchronously, each movable beam 20 and 21 repeats the operation | movement which raises, advances, descends, and retracts.
At this time, if the upper surface height positions of the eccentric wheels 45 and 46 constituting each eccentric wheel group 47 are always at the same level, the movable beams 20 and 21 are in contact with the lower surface of the slab at a right angle. The center position in the furnace width direction of the two fixed beams 16 and 17 (hereinafter also referred to as the fixed beam center) and the center position in the furnace width direction of the movable beams 20 and 21 (hereinafter also referred to as the movable beam center) are always present. Match. Therefore, the slab is conveyed in the heating furnace 15 without meandering.

However, in reality, as the heating equipment 10 is used, the upper surface height positions of the eccentric wheels 45 and 46 constituting each eccentric wheel group 47 become different levels. The cause of this is, for example, wear of the eccentric rings 45 and 46 and a phase shift between the two eccentric rings 45 and 46.
Thus, when the upper surface height position of each eccentric wheel 45 and 46 becomes a different level, the center position of the two movable beams 20 and 21 in the in-furnace width direction and the two fixed beams 16 and 17 in the furnace The center position in the width direction is shifted, and the slab is conveyed in the heating furnace 15 while meandering. This phenomenon will be described with reference to FIGS. 5A to 5D, two fixed beams 16 and 17 are arranged between the two movable beams 20 and 21 for the sake of convenience of explanation, but the phenomenon that occurs is the same.
When each movable beam 20, 21 comes into contact with the lower surface of the slab during the ascending of each movable beam 20, 21 (for example, the rotation angle of each eccentric wheel 45, 46 is 90 degrees), as shown in FIG. The movable beams 20 and 21 are in contact with the lower surface of the slab 12 while being inclined. In this case, one movable beam 20 moves away from the fixed beam center, and the other movable beam 21 moves closer to the fixed beam center, that is, a place where the movable beam 20 is originally in contact with the lower surface of the slab (that is, the movable beams 20, 21 are From the place where the slab rises vertically and contacts the lower surface of the slab at a right angle from one side in the inner width direction of the furnace, it is shifted by ΔC1 in the inner width direction.

Then, when the slab is raised most with the slabs placed on the movable beams 20 and 21 (for example, the rotation angle of the eccentric wheels 45 and 46 is 180 degrees), the height of the upper surfaces of the eccentric wheels 45 and 46 is increased. If the position is the same level, as shown in FIG. 5B, the fixed beam center coincides with the movable beam center. However, as shown in FIG. 5 (A), each movable beam 20, 21 is in contact with the lower surface of the slab while being displaced in the furnace width direction by ΔC1 to one side in the furnace width direction. Shift to the other side in the furnace width direction.
Next, immediately before the movable beams 20 and 21 are separated from the lower surface of the slab during the lowering of the movable beams 20 and 21 (for example, the rotation angle 270 degrees of the eccentric wheels 45 and 46), FIG. As shown, the movable beams 20 and 21 are in contact with the lower surface of the slab 12 in an inclined manner. In this case, one movable beam 20 is closer to the center of the fixed beam, and the other movable beam 21 is away from the center of the fixed beam, that is, from the position where it originally contacts the lower surface of the slab to the other side in the furnace width direction. , ΔC2 is shifted in the width direction in the furnace and contacts.

Then, as shown in FIG. 5D, the slab is transferred from the movable beams 20 and 21 to the fixed beams 16 and 17 in a state where the fixed beam center and the movable beam center are shifted from each other. 20 and 21 are lowered to the lowermost position (for example, the rotation angle 360 degrees of the eccentric wheels 45 and 46).
By repeating the operations described above, slab meandering due to the displacement of the height positions of the upper surfaces of the eccentric wheels 45 and 46 occurs.
Therefore, this deviation is obtained by the following method, and the meandering locus of the slab is simulated.
First, for each eccentric ring group 47, the difference in the upper surface height position of each of the eccentric rings 45 and 46 constituting the eccentric ring group 47 is obtained. In obtaining this difference, as shown in FIG. 1, a laser marking device (an example of a laser displacement meter) 49 provided on the eccentric wheel 45 side (one side) of the movable frame 20, 21 on the lifting frame 26 in the furnace width direction. Is used. The laser marking device 49 is attached to the elevating frame 26 directly above the eccentric wheel 45 on one side (within a range of 10 cm upward from the position of the upper surface of the eccentric wheel 45), and directly above the eccentric wheel 46 on the other side. By reading a scale (not shown) attached to the elevating frame 26, the difference in the upper surface height position of each eccentric wheel 45, 46 is obtained.

Next, when the movable beams 20 and 21 come into contact with the lower surface of the slab while the movable beams 20 and 21 causing the meandering of the slab are raised by the laser marking device 49, that is, the state shown in FIG. The difference σ1 of the upper surface height position A of each eccentric wheel 45, 46 is obtained. The difference σ1 is not necessarily obtained at the position where the movable beams 20 and 21 are in contact with the lower surface of the slab, but is a value set in advance for the rotational angle position of the eccentric wheel (at the timing when the movable beam contacts the lower surface of the slab. (An angular position at a close timing), for example, 90 degrees may be set, and it may be obtained by detecting that the eccentric wheel has rotated to this rotational angle position. The difference σ1 can also be obtained by detecting that the movable beam has contacted the lower surface of the slab using a load cell (an example of a load detector).
The difference σ1 may be obtained by measuring the upper surface height position A of each eccentric wheel 45, 46, respectively.

As shown in FIG. 5 (A), if the difference σ1 at the upper surface height position A of each eccentric wheel 45, 46 is known by actual measurement, the upper surface height position A of each eccentric wheel 45, 46 is assumed to be the same level. The upper surface height of each eccentric wheel 45, 46 when a difference σ1 occurs between the straight line L1 connecting the upper surface height position of each eccentric wheel 45, 46 and the upper surface height position A of each eccentric wheel 45, 46. An angle α1 degree formed by the straight line L2 connecting the positions is obtained. At this time, the movable beam 20 is also inclined with respect to the movable beam 20 in the vertical state at the angle α1 degree, and therefore, the shift amount (hereinafter also simply referred to as a shift amount) ΔC1 is (1) due to the similarity. ).
ΔC1 = H ÷ L × σ1 (1)
Here, H is the height (mm) from the upper surface position of the eccentric wheel 45 to the lower surface position of the slab, and L is the distance (mm) between the left and right eccentric wheels 45, 46.

Similarly, when the movable beams 20 and 21 are separated from the lower surface of the slab during the lowering of the movable beams 20 and 21 by the laser marking device 49, each eccentric wheel 45 in the state shown in FIG. The difference σ2 of the upper surface height position B of 46 is obtained by actual measurement. This difference σ2 can also be obtained by the same method as the above-described difference σ1. The difference σ2 may be obtained by measuring the upper surface height position B of each eccentric wheel 45, 46, respectively.
By knowing this difference σ2, the shift amount ΔC2 can be obtained from the equation (2) based on the same idea as the difference σ1 described above.
ΔC2 = H ÷ L × σ2 (2)
Accordingly, the total deviation amount ΔC generated by one rotation (one cycle) of each eccentric wheel 45, 46 is the sum of the deviation amount ΔC1 and the deviation amount ΔC2 (the deviation amount calculation step).

The total deviation amount ΔC is obtained for each of the eccentric groups 47, and the slab meandering locus in the heating furnace 15 is simulated based on this difference.
As shown in FIG. 6, the simulation method is as follows. First, the total deviation amount ΔC in the eccentric ring group positioned upstream of the adjacent eccentric ring group (that is, the # 1 eccentric ring), and the downstream position. Based on the total deviation amount ΔC in the eccentric ring group (that is, # 2 eccentric ring), the deviation amount for each of a plurality of points between the eccentric ring groups is calculated by linear interpolation (bar graph in FIG. 6). In addition, each point is good to set it as the position which divided | segmented the distance between eccentric ring groups into 5-30 parts so that the meandering locus | trajectory of a slab can be understood clearly.
Next, the amount of displacement of the slab at each point is accumulated to obtain a meandering locus between the eccentric ring groups (a line connecting ◆ in FIG. 6).
Thereby, the meandering locus of the slab can be simulated from the carry-in port 13 to the carry-out port 14 of the slab 12 of the heating furnace 15.
Then, it is determined whether or not the obtained meandering locus of the slab is within a preset allowable range.
Here, the allowable range means, for example, a range in which the slab does not fall from the movable beams 20 and 21 and does not contact the furnace wall of the heating furnace 15 (the meandering trajectory estimation process).

Therefore, if the meandering locus of the slab is out of the allowable range, the upper surface height positions A and B of the eccentric rings 45 and 46 constituting at least one eccentric ring group 47 are obtained, and then the meandering locus of the slab is simulated again. Try again.
Here, the eccentric wheel group 47 for correcting the upper surface height positions A and B of the eccentric wheels 45 and 46 is the eccentric wheel group 47 in which the amount of meandering of the slab 12 is the largest on the simulated meandering locus of the slab 12. An eccentric ring group 47 in which a total displacement amount ΔC that causes the slab 12 to meander most greatly is preferable. At this time, the eccentric ring group 47 to be corrected may be one place or a plurality of places (about 2 to 5 places), but the eccentric ring group 47 that maximizes the total displacement amount ΔC of the slab 12 is most preferable. At most, it is preferable to include the eccentric wheel group 47 having the next largest total deviation amount ΔC. This is because if the number of eccentric wheel groups 47 to be corrected increases, the conveyance path of the slab 12 may change in a complicated manner, and subsequent simulation of correcting the meandering amount becomes difficult, and the meandering locus is within an allowable range. This is because it takes a long time to settle.

As a method of correcting the upper surface height positions A and B of the eccentric wheels 45 and 46 constituting the eccentric wheel group 47, for example, a method of adjusting the phase of the eccentric wheel 45 or the eccentric wheel 46, the pinion 34 (or the pinion 35), and the like. ) And the large gear 41 (or the large gear 42).
The above operation is repeated until the slab meandering trajectory is within the allowable range (the meandering trajectory correcting step).
As a result, if the meandering trajectory of the slab is within the allowable range, the upper surface height positions A and B of the eccentric rings 45 and 46 constituting the eccentric ring group 47 are actually determined based on this correction information, that is, the simulation result. Adjust and carry the slab. Each of the above-described deviation amount calculating step, meandering locus estimating step, and meandering locus correcting step is calculated by a program based on information input to a computer (calculation means).
Accordingly, it is possible to quantify the relationship between the level difference between the eccentric wheels 45 and 46 constituting each eccentric wheel group 47 and the meandering state of the slab, and the position of the upper surface height of the eccentric wheels 45 and 46 of which eccentric wheel group 47 If A and B are corrected, it becomes possible to quantitatively grasp how the slab meanders, and an optimal improvement method can be derived.

Next, examples carried out for confirming the effects of the present invention will be described.
Here, six eccentric ring groups (shaded portions surrounded by squares shown in FIGS. 7 and 8) are installed at stroke numbers 5, 20, 35, 50, 65, and 80 from the upstream side to the downstream side, respectively. The result of correcting the meandering of the slab using the heated furnace will be described. The stroke means one rotation of each eccentric wheel, and the slab conveyance distance per stroke is about 600 mm. The height H from the upper surface position of the eccentric wheel to the lower surface position of the slab is 5765 (mm), and the distance L between the left and right eccentric wheels is 3200 (mm).

First, as a result of obtaining the difference σ1 of the upper surface height position A of each eccentric wheel for each eccentric wheel group when the movable beam comes into contact with the lower surface of the slab during the ascending of each movable beam, From the upstream side to the downstream side of the furnace, they were 0 mm, -2 mm, 1.5 mm, -0.5 mm, 0.5 mm, and -2 mm.
Further, as a result of obtaining the difference σ2 of the upper surface height position B of each eccentric wheel for each eccentric wheel group when the movable beam is separated from the lower surface of the slab during the descent of the movable beam, From the upstream side to the downstream side, they were −1 mm, −0.5 mm, 3 mm, 0.5 mm, −0.5 mm, and −2 mm.

Based on this result, a deviation amount ΔC1 and a deviation amount ΔC2 were determined for each eccentric wheel group. The shift amount ΔC1 is a value when the movable beam contacts the lower surface of the slab, that is, a value when the rotation angle of each eccentric wheel is 90 degrees, and the shift amount ΔC2 is a value when the movable beam leaves the lower surface of the slab. , That is, the value when the rotation angle of each eccentric wheel is 270 degrees.
Here, the shift amount ΔC1 was 0 mm, −3.60 mm, 2.70 mm, −0.90 mm, 0.90 mm, and −3.60 mm from the upstream side to the downstream side of the heating furnace.
Moreover, deviation | shift amount (DELTA) C2 was 1.80 mm, 0.90 mm, -5.40 mm, -0.90 mm, 0.90 mm, and 3.60 mm from the upstream side of the heating furnace to the downstream side.
As a result of obtaining the total deviation amount ΔC (that is, the sum of the deviation amount ΔC1 and the deviation amount ΔC2) from the deviation amount ΔC1 and the deviation amount ΔC2, 1.80 mm, −2 from the upstream side to the downstream side of the heating furnace. .70 mm, -2.70 mm, -1.80 mm, 1.80 mm, and 0 mm.

Next, FIG. 7 shows the result of simulating the meandering locus of the slab based on the obtained total deviation amount ΔC.
As is clear from FIG. 7, it was found that the slab meanders greatly and the meandering locus is outside a preset allowable range (for example, ± 40 mm).
Therefore, the following procedure is performed.
1) From FIG. 7, the place where the meandering amount of the slab is the largest (that is, stroke number 57: meandering amount of about 73 mm) is obtained.
2) Based on the result of 1) described above, from FIG. 7, an eccentric wheel on the upstream side (ie, stroke number: 1 to 56) where the meandering amount is the largest and which has the largest deviation amount ΔC is determined. .

3) A correction amount ΔC0 of the deviation amount of the eccentric wheel having the largest deviation amount is determined.
The correction amount may be constant regardless of the value of the total deviation amount ΔC in step control, or may be a value corresponding to the value of the total deviation amount ΔC (for example, about 50% of the total deviation amount ΔC).
4) Subtract the deviation correction amount ΔC0 from the total deviation amount ΔC to obtain the remaining ΔC1.
5) The total deviation amount ΔC is changed to the remaining ΔC1 obtained in the above procedure 4), and the simulation is performed again.
6) Repeat the above steps 1) to 5) until the slab meandering trajectory is within the allowable range.

7) Based on the total deviation amount ΔC when it is within the allowable range, find the correction amount of the gear (gear teeth, bolt mounting holes) from Table 1, and adjust the actual gear based on this. Adjust the height of the top surface of the eccentric ring.
Table 1 is a conversion table in which the relationship between the correction amount of the gear (gear teeth, bolt mounting hole) and the changing deviation amount ΔC0 is obtained in advance with an actual machine. Numerical values are omitted. In addition, although there are numerical values for the reverse rotation of the gear teeth 39 or less and the forward rotation 11 or more, and the reverse rotation 8 or less and the forward rotation 6 or more of the bolt mounting hole, there are numerical values, but they are omitted here.

Here, a method for adjusting the gears (gear teeth, bolt mounting holes) of the clutch will be specifically described using a method for adjusting the phase of the eccentric wheel 45 or the eccentric wheel 46.
The gear coupling 38 (gear coupling 39) is provided with fourteen bolt mounting holes at an equal angle with the axis as the center. Further, the intermediate shaft 32 (intermediate shaft 33) is provided with 50 gear teeth at an equal angle around the axis. Therefore, the bolt mounting hole is provided in the gear coupling 38 at an angle of 25.71 degrees (= 360 degrees / 14), and the gear teeth are 7.20 degrees (= 360 degrees / 50) in the intermediate shaft 32. It is provided at an angle.
Here, for example, if a phase shift of 1.02 degrees occurs between the eccentric ring 45 and the eccentric ring 46, the intermediate shaft 32 is rotated forward (or reverse) as shown in FIG. 4B. Turn seven gear teeth in the direction (rotation angle: 7.20 × 7 = 50.40 degrees) and rotate the bolt mounting holes in the reverse (or forward) direction two (rotation angle: 25.71 × 2 = 51. 42 degrees).
Accordingly, a phase shift of 1.02 degrees (= 51.42-50.40) can be eliminated.
The correction amount ΔC0 of the shift amount that changes at this time is 2.70.

As a result, the top surface height position of each eccentric wheel of the eccentric wheel group to be corrected is corrected, and the top surface height position A of each eccentric wheel group for each eccentric wheel group is again measured by the laser ink extractor 49. The difference σ1 in the upper surface height position of the eccentric ring was 0 mm, 1 mm, 3 mm, 0.5 mm, 1 mm, and −1.5 mm from the upstream side to the downstream side of the heating furnace.
Further, as a result of measuring the upper surface height position B of each eccentric wheel for each eccentric wheel group again with the laser marking device 49 in the same manner as described above, the difference σ2 in the upper surface height position of each eccentric wheel is It became 0.5 mm, 1 mm, 3 mm, 1 mm, 0 mm, and -1 mm from the side to the downstream side.

Based on this result, a deviation amount ΔC1 (a deviation amount at 90 degrees) and a deviation amount ΔC2 (a deviation amount at 270 degrees) were obtained again for each eccentric wheel group.
The shift amount ΔC1 was 0 mm, 1.80 mm, 5.40 mm, 0.90 mm, 1.80 mm, and −2.70 mm from the upstream side to the downstream side of the heating furnace.
Moreover, deviation | shift amount (DELTA) C2 was -0.90mm, -1.80mm, -5.40mm, -1.80mm, 0mm, and 1.80mm from the upstream of the heating furnace to the downstream.
As a result of obtaining the total shift amount ΔC from the shift amount ΔC1 and the shift amount ΔC2, from the upstream side to the downstream side of the heating furnace, −0.90 mm, 0 mm, 0 mm, −0.90 mm, 1.80 mm, and -0.90 mm.

Next, FIG. 8 shows the result of simulating the meandering trajectory of the slab based on the obtained total deviation amount ΔC.
As is apparent from FIG. 8, it was found that the amount of meandering of the slab was greatly reduced and the meandering locus was within the allowable range.
Furthermore, when the slab was transported and the transport trajectory was measured with a measuring instrument, the slab could be transported without greatly deviating from the allowable range.
From the above, it was confirmed that prediction of the slab meandering state and correct meandering correction could be easily performed in a short time without confirming the state of slab conveyance in the heating furnace.

As described above, the present invention has been described with reference to the embodiment. However, the present invention is not limited to the configuration described in the above embodiment, and the matters described in the scope of claims. Other embodiments and modifications conceivable within the scope are also included. For example, a case where the slab meandering correction method in the heating furnace of the present invention is configured by combining some or all of the above-described embodiments and modifications is also included in the scope of the present invention.
For example, the configuration of the drive mechanism is not limited to the above-described configuration as long as the operation of ascending, advancing, descending, and retreating a plurality of movable beams can be repeated using an eccentric wheel.
In the above embodiment, the case where the fixed beam is arranged on both sides of the movable beam in the width direction when the inside of the furnace is viewed from the front is described. However, the movable beam is arranged on both sides of the fixed beam. You may arrange.

And in the said embodiment, although the case where the number of the eccentric rings which comprise one eccentric ring group was two was demonstrated, according to the scale of a heating furnace, it is set as three or more (for example, four pieces). Also good. In this case, for example, the height position of the upper surface of the eccentric wheel can be measured by measuring the height positions of the other lifting frames with a laser displacement meter provided on one side of the lifting frame in the furnace width direction.
Furthermore, in the above-described embodiment, the case where the laser inking device is used to determine the difference in the upper surface height position of each eccentric wheel constituting the eccentric wheel group has been described. However, the present invention is not limited to this. . For example, laser distance meters may be attached to both sides of the lifting frame in the furnace width direction to measure the distance from the floor surface, or may be measured using a measure or the like.

10: walking beam type heating equipment, 11: refractory material, 12: slab, 13: carry-in port, 14: carry-out port, 15: heating furnace, 16, 17: fixed beam, 18: fixed mounting part, 19: fixed Support part, 20, 21: Movable beam, 22: Movable mounting part, 23: Movable support part, 24: Through hole, 25: Cavity part, 26: Lifting frame, 27: Drive mechanism, 28: Drive motor, 29: Power transmission shaft, 30, 31: Power transmission gear, 32, 33: Intermediate shaft, 34, 35: Pinion, 36, 37: Rotating shaft, 38, 39: Gear coupling, 40: Bolt, 41, 42: Large gear 43, 44: Rotating shaft, 45, 46: Eccentric ring, 47: Eccentric ring group, 48: Cylinder, 49: Laser marking device (laser displacement meter)

Claims (6)

Provided on a plurality of movable beams arranged side by side in the furnace width direction of the walking beam type heating furnace that heats the slab, and from a plurality of eccentric wheels arranged in the width direction outside the furnace of the heating furnace A plurality of eccentric rings are provided at a predetermined interval in the longitudinal direction of the movable beam, and the movable beams are moved upward, forward, downward, and backward by synchronously driving the eccentric wheels. Repetitively, a method of correcting the meandering of the slab generated when the slab in the heating furnace is conveyed in the longitudinal direction of the furnace,
The difference in the upper surface height position of each eccentric wheel constituting the eccentric wheel group that causes the meandering of the slab is obtained by actual measurement for each eccentric wheel group, and the difference in the heating furnace is determined based on the difference. If the meandering locus of the slab is simulated, and if the meandering locus of the slab is outside the preset allowable range, the height position of the upper surface of the eccentric wheel constituting at least one eccentric wheel group is corrected and corrected. The step of re-determining the difference in the upper surface height position of each eccentric wheel according to the upper surface height position, and re-simulating the meandering locus of the slab based on the difference, the meandering locus of the slab is within the allowable range. The method of correcting the slab meandering in the heating furnace is characterized in that it is repeatedly performed until the upper surface height position of the eccentric ring is adjusted based on the simulation result. 2. The method for correcting slab meandering in a heating furnace according to claim 1, wherein the difference in the upper surface height position of each of the eccentric rings constituting the eccentric ring group is that the movable beam is in the middle of the ascent of the movable beam. The upper surface height position A of each eccentric wheel when contacting the lower surface, and the upper surface height position B of each eccentric wheel when the movable beam is separated from the lower surface of the slab while the movable beam is descending, respectively. A method for correcting meandering of a slab in a heating furnace, characterized in that it is measured and obtained based on the measured value. The slab meandering correction method in a heating furnace according to any one of claims 1 and 2, wherein the movable beam is brought into contact with the lower surface of the slab and the movable beam is detached from the lower surface of the slab. A method for correcting meandering of a slab in a heating furnace, wherein detection is performed based on a preset rotation angle position of each eccentric wheel or detection information of a load detector of the slab provided on the movable beam. The slab meandering correction method in a heating furnace according to any one of claims 1 to 3, wherein the adjustment of the upper surface height position of the eccentric wheel based on the corrected upper surface height position of the eccentric wheel is performed by the eccentric wheel. The method for correcting the slab meandering in the heating furnace is characterized by adjusting the phase of the slab. The slab meandering correction method in the heating furnace according to any one of claims 1 to 4, wherein the correction of the upper surface height position of the eccentric wheel constituting the eccentric wheel group simulates the meandering locus of the slab. In this case, the heating is performed on the eccentric wheel constituting the eccentric wheel group that is upstream of the eccentric wheel group in which the amount of meandering of the slab becomes the largest and that causes the slab to meander most greatly. How to correct slab meandering in the furnace. The slab meandering correction method in a heating furnace according to any one of claims 1 to 5, wherein each movable beam provides a difference in an upper surface height position of each eccentric wheel constituting each eccentric wheel group. A method for correcting meandering of a slab in a heating furnace, characterized in that the measurement is performed by a laser displacement meter provided on one side in the furnace width direction of an elevating frame whose lower surface is in contact with each eccentric wheel.

Images