JP4702166B2 - Method and apparatus for cooling shape steel - Google Patents

Description

  The present invention relates to a method and apparatus for cooling a section steel, and more specifically, a method for cooling a section steel effective for cooling an extremely thick section steel such as an extremely thick H-section steel or a parallel flange groove section steel. And a cooling device.

  In recent years, shape steels such as extremely thick H-section steel and parallel flange groove-shaped steel with thick flanges and webs are used as pillar materials for high-rise building structures. These extra-thick section steels are required to have high strength, high toughness, and high weldability, and in order to obtain these performances, there is a technology for cooling the extra-thick section steel in a hot rolling line. Many have been proposed.

Recently, as schematically shown in FIG. 5, for example, an H-shaped steel cooling device has been proposed in which inner surface cooling devices 2 and 3 are provided at positions avoiding the gap between both flanges 1 fa and 1 fb of the H-shaped steel 1. .
JP 2001-129607 A

  However, in the cooling device proposed in Patent Document 1, the header pipe 2b and the upper nozzle 2c of the upper flange inner surface cooling device 2 are connected to the flanges 1fa, 4b from the side guides 4a, 4b provided on the outer surface side of the flanges 1fa, 1fb. It is supported by an upper support member 2a projecting to the inner surface side of 1fb. That is, since the upper support member 2a is provided at an upper position relatively close to the flanges 1fa and 1fb of the H-section steel 1, when the H-section steel 1 is warped upward, the H-section steel 1 is There is a risk of collision with 2a.

  Further, since the left and right header pipes 2b attached to the tip of the upper support member 2a are close to each other, the H-section steel 1 having a small inner width of the web 1w, that is, the interval W1 between the inner surfaces of both flanges 1fa and 1fb is used. When cooling, if the left and right upper nozzles 2c are set at predetermined positions, the left and right header tubes 2b and the left and right upper nozzles 2c may interfere with each other.

  In order to avoid this interference, if the left and right upper nozzles 2c are set to positions that do not interfere with each other, that is, positions close to the inner surfaces of the flanges 1fa and 1fb, the injection angle θ is inevitably reduced, so that the inner surface cooling of the flanges 1fa and 1fb is reduced. There is a possibility that it cannot be effectively performed. This phenomenon is the same in the case of the lower flange inner surface cooling device 3.

  Further, when high-pressure cooling water is sprayed onto the H-section steel 1, the scale attached to the surface of the H-section steel 1 is peeled off and dropped. Since this scale is generated every time a new surface of the material is generated by hot rolling, in the case of repeated rolling of a plurality of passes such as intermediate rolling of the H-section steel 1, the scale is in each pass where cooling water is injected. Peel and fall. Therefore, the scale peeled off during cooling may drop and adhere to the lower nozzle 3c provided on the header pipe 3b supported by the lower support member 3a that projects in the direction from the one side guide 4a to the other side guide 4b. is there.

  Further, when the inner surface of the fillet is intensively cooled, it is extremely difficult to concentrate the cooling water on the inner surface of the fillet when the injection angle θ of the upper nozzle 2c is small, and the flanges 1fa, 1fb Cooling water is also injected into the inner surface of the. In order to prevent this, if the upper support member 2a is extended in the direction of the side guide 4b or 4a on the other side, the positions of the left and right upper nozzles 2c become closer, and the width of the web 1w of the H-shaped steel 1 that can be cooled. Will be further limited. The same applies to the lower nozzle 3c.

In view of this, the present applicant has proposed a cooling apparatus for shape steel and a cooling method using this cooling apparatus capable of solving the above-described problems in Patent Document 2.
JP 2003-19510 A

  According to the cooling method using the cooling device proposed in Patent Document 2, when cooling a shape steel such as an H-section steel or a parallel flange groove shape steel after hot rolling such as intermediate rolling or finish rolling, Even a narrow shaped steel can effectively cool its inner surface, especially the inner surfaces of flanges and fillets.

  FIG. 6 shows a front view of a cooling device that implements the method for cooling a shape steel disclosed in Patent Document 2. In this case, both sides sandwiching the shape steel (in the case of FIG. 6, H-section steel 1) from both sides in the width direction. The gap d between the inside of the guides 4a and 4b and the outer surface of the flanges 1fa and 1fb of the H-section steel 1 is generally set to about several tens of mm. This occurs in the rolling process in the previous stage of cooling the H-section steel 1 or to the side guide 4a or 4b of the H-section steel 1 being cooled by the bending in the left-right direction generated in the cooling process of the H-section steel 1. This is to prevent the H-shaped steel 1 from being disabled due to the bumps or excessive frictional force generated between the side guide 4a or 4b and the H-shaped steel 1. In addition, 5 in FIG. 6 shows the outer surface cooling device provided with the header pipe | tube 5a and the nozzle 5b.

  However, from the viewpoint of cooling efficiency, it is desirable to set the gap d between the side guides 4a, 4b and the H-section steel 1 as small as possible. Because, as the distance L between the inner surfaces of the side guides 4a and 4b is larger than the width W of the H-section steel 1, the H-section steel 1 is more likely to meander or swing in the width direction in the cooling process. As the distance between the nozzles 2c, 3c for cooling the inner surface of the steel 1 and the flanges 1fa, 1fb of the H-shaped steel 1 and the inner surface of the fillet and the fillet change, the cooling regions of the flanges 1fa, 1fb and the fillet fluctuate. This is because cooling in the cross section of the section steel 1 and in the longitudinal direction becomes non-uniform.

  That is, when the gap d between the left and right side guides 4a, 4b and the H-section steel 1 is large, the H-section steel 1 is biased in the horizontal direction indicated by, for example, the white arrow in FIG. 7A, and the cooling nozzles 2c, 3c A region (indicated by a dotted circle) where the injected cooling water does not sufficiently hit the inner surfaces of the flanges 1 fa and 1 fb of the H-shaped steel 1, that is, an insufficient cooling region occurs. This problem is the same when the parallel flange channel steel 6 is cooled as shown in FIG.

Note that Patent Document 3 discloses an H-shaped steel cooling device that can keep the distance between the cooling device and the surface to be cooled substantially constant even when the H-shaped steel being cooled has a left / right bend. .
JP-A-8-257621

However, the cooling device disclosed in Patent Document 3 has the following problems.
In Patent Document 3, the left and right sides of the guide member are in contact with the flange inner surface of the H-shaped steel, which is the material to be cooled, and the lower surface thereof is in sliding contact with the web. When guiding the guide member, there is a possibility that a bumping trouble or the like occurs. Such a stagnation trouble is more likely to occur because the left and right bends, the up and down warp, and the meandering are more likely to occur as the dimension of the H-section steel becomes smaller.

  In addition, the cooling device disclosed in Patent Document 3 is considerably large in equipment configuration, such as a guide member, a cooling device installed adjacent to the guide member, and a guide rail installed across the material to be cooled. The production and installation costs of the are very high.

Furthermore, since the cooler of the cooling device disclosed in Patent Document 3 requires piping for guiding the cooling water from the outside, it can be easily estimated that the structure is considerably large. When the guide member or the cooling device is guided into the groove-shaped portion of the shape steel, piping of the cooling device may hit the H-shaped steel. Further, when cooling the H-shaped steel with a small size, the installation of the piping becomes a bottleneck, and it is very likely that the installation of the cooling device cannot be realized.
In short, the H-section steel cooling device disclosed in Patent Document 3 is a device with poor feasibility.

  The problem to be solved by the present invention is that in conventional cooling, when cooling a shape steel such as an H-section steel or a parallel flange groove shape steel after hot rolling such as intermediate rolling or finish rolling, If there is a left / right bend, vertical warping, or meandering, the flange of the shape steel and the inner surface of the fillet are uniform in the same cross section and in the longitudinal direction without causing any trouble to the cooling device. It is a point that it cannot cool effectively.

  The inventors of the structural steel cooling device disclosed in Patent Document 2 adjust the cooling water injection angle of the cooling nozzle according to the position in the horizontal direction with respect to the side guide of the structural steel as the material to be cooled. The present inventors have found that problems can be solved and have completed the present invention.

The method for cooling the shaped steel of the present invention comprises:
When cooling a shape steel, if the shape steel is bent left and right, up and down, or meandering, or even if the shape of the web has a small inner width, it will not cause a trouble with the cooling device. In order to allow uniform and effective cooling of the inner surface of the flange and fillet of the section steel in the cross section and in the longitudinal direction,
A plurality of side guides provided along the pass line on at least one of the upper and lower sides of each of the pair of side guides provided across the pass line in the transport path of the shaped steel so as to be movable in the direction of contacting and separating from each other. When cooling the flange inner surface and web surface of the shape steel conveyed on the pass line with the cooling nozzle, or the flange inner surface or web surface,
Detecting a relative position of the outer surface of the flange in the steel frame to be conveyed with respect to the side guide facing the outer surface of the flange;
Cooling while adjusting the spray angle of the cooling nozzle according to the detected relative position is the main feature.

The method for cooling the shaped steel of the present invention comprises:
A pair of side guides provided across the pass line in the shaped steel conveyance path so that movement in the direction of contact with each other is possible;
A plurality of cooling nozzles provided along at least one of the upper and lower sides of each of the pair of side guides along a pass line, for cooling the flange inner surface and the web surface of the shape steel, or the flange inner surface or the web surface;
An injection angle adjusting mechanism for adjusting the injection angle of these cooling nozzles;
A detector for detecting a relative position of the outer surface of the flange in the section steel conveyed on the pass line with respect to the side guide facing the outer surface of the flange;
The present invention can be implemented using the structural steel cooling device according to the present invention, which is provided with a control device that adjusts the injection angle of the cooling nozzle in accordance with the relative position detected by the detector.

  According to the present invention, when the shape steel is cooled after hot rolling, even if the shape steel is bent left and right, warped up or down, or meanders, the groove shape region surrounded by the web and the flange is not greatly affected. Even when cooling a structural steel with a relatively small web width, which is difficult to incorporate the device, the inner surface of the flange and fillet of the structural steel must be uniformly and effectively cooled in the same cross section and in the longitudinal direction. Can do.

  Moreover, if the detector of the relative position of a side guide and a shape steel is integrated in a side guide, since the whole cooling device can be made compact, the expense concerning manufacture and installation of equipment can be reduced.

Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to FIGS.
FIG. 1 is a diagram schematically showing an example of a structural steel cooling device of the present invention that implements the method of cooling a structural steel of the present invention, and FIG. 2 is a diagram of FIG. 1 viewed from above.

  In FIG. 1, 11 a and 11 b are a pair of side guides that are long in the direction of the pass line P and are provided in the path of the H-shaped steel 1 to be cooled with the pass line P interposed therebetween. Slide bases 12a and 12b are provided at the bottom of the position.

  These slide bases 12a and 12b are mounted on a plurality of mounts 13 provided between the transport rollers 7 that transport the H-section steel 1, and for example, racks provided on the slide bases 12a and 12b and the mounts 13 By the pinion, the pair of side guides 11a and 11b move horizontally in synchronism with the direction in which they come into contact with and away from each other.

  The positions of the side guides 11a and 11b are adjusted so that the distance L between the opposing inner sides is larger than the distance W between the outer surfaces of the flanges 1fa and 1fb of the H-section steel 1 by a predetermined amount. Prevents bending and misalignment of the shape steel 1 in the left-right direction.

  Further, the side guides 11a and 11b are provided with holes in the longitudinal direction thereof to insert long header pipes 14a and 14b, and the header pipes 14a and 14b are arranged at a plurality of positions with their tips directed in the direction of the pass line P. The outer surface cooling nozzles 15a and 15b are provided.

  In addition, one end of the links 16a and 16b is fixed to, for example, both end positions of the header pipes 14a and 14b, and the other ends of the links 16a and 16b are rod ends of cylinders 17a and 17b provided on the slide bases 12a and 12b. It is pivotally supported. That is, the links 16a and 16b and the cylinders 17a and 17b constitute an injection angle adjusting mechanism for the outer surface cooling nozzles 15a and 15b, and the header pipes 14a and 14b are rotated around the axis by driving the cylinders 17a and 17b. The direction of the outer surface cooling nozzles 15a and 15b is adjusted.

  Above the side guides 11a and 11b, for example, the upper bases 18a and 18b that are long in the longitudinal direction of the side guides 11a and 11b, whose lower surfaces are inclined downwardly toward the pass line P, are formed on the upper surfaces. It is provided via wedges 19a and 19b which are inclined surfaces having a downward slope in the same direction as the lower surfaces of the upper bases 18a and 18b.

  The wedges 19a and 19b are horizontally moved in the direction of the pass line P by screw fitting with screw shafts 21a and 21b that are rotated forward and backward by motors 20a and 20b, and upper bases 18a and 18b provided on the upper sides thereof. 18b is moved up and down to adjust the vertical positions of upper inner surface cooling nozzles 22a and 22b and header pipes 23a and 23b, which will be described later. The wedges 19a and 19b, motors 20a and 20b, screw shafts 21a and 21b, and the like constitute an upper nozzle position adjusting mechanism.

  Support members 24a and 24b are provided at a plurality of positions in the longitudinal direction including the vicinity of both ends of the upper bases 18a and 18b. The headers are supported by the support members 24a and 24b and are long in the longitudinal direction of the upper bases 18a and 18b. Tubes 23a and 23b are provided. Then, upper inner surface cooling nozzles 22a and 22b are provided at a plurality of positions in the longitudinal direction of these header pipes 23a and 23b with their tips directed toward the inner surface of the flange 1f on the other side with respect to the pass line P. Yes.

  For example, as shown in FIG. 2, the upper inner surface cooling nozzles 22a and 22b have an arrangement interval in the pass line P direction of one upper inner surface cooling nozzle 22a and an arrangement interval in the pass line P direction of the other upper inner surface cooling nozzle 22b. It is provided to be the same.

  In addition, the upper inner surface cooling nozzles 22a and 22b, like the outer surface cooling nozzles 15a and 15b, are configured by the links 25a and 25b and the cylinders 26a and 26b to form an injection angle adjustment mechanism for the upper inner surface cooling nozzles 22a and 22b. By driving the cylinders 26a and 26b, the header pipes 23a and 23b are rotated around their axes, and the orientation of the upper inner surface cooling nozzles 22a and 22b is adjusted.

  Below the side guides 11a and 11b, a lower base (not shown) that is long in the longitudinal direction of the side guides 11a and 11b is provided via wedges 27a and 27b. These wedges 27a and 27b move horizontally in the direction of the pass line P by screw fitting with screw shafts 29a and 29b that are rotated forward and backward by motors 28a and 28b, and move up and down the lower base provided at the lower part thereof. Thus, the vertical positions of lower inner surface cooling nozzles 30a and 30b and header pipes 31a and 31b, which will be described later, are adjusted. The wedges 27a and 27b, the motors 28a and 28b, the screw shafts 29a and 29b, and the like constitute a lower nozzle position adjusting mechanism.

  Support members 32a and 32b are provided at a plurality of positions in the longitudinal direction of the lower base, and header pipes 31a and 31b which are supported by the support members 32a and 32b and are long in the longitudinal direction of the lower base are connected to the side guide 11a. , 11b is provided on the side opposite the pass lie P from the front surface. Then, at a plurality of positions in the longitudinal direction of these header pipes 31a and 31b, lower inner surface cooling nozzles 30a and 30b are provided with their tips facing flanges 1fb and 1fa on the other side with respect to the pass line P. ing. Further, the lower inner surface cooling nozzles 30a and 30b are arranged in the same manner as the upper inner surface cooling nozzles 22a and 22b, and the arrangement interval of the one lower inner surface cooling nozzle 30a in the pass line P direction and the other lower inner surface cooling nozzle 30b. Are arranged so that the arrangement intervals in the pass line P direction are the same.

  The lower inner cooling nozzles 30a and 30b also form the injection angle adjusting mechanism of the lower inner cooling nozzles 30a and 30b by the links 33a and 33b and the cylinders 34a and 34b, similarly to the outer cooling nozzles 15a and 15b. Then, by driving the cylinders 34a and 34b, the header pipes 31a and 31b are rotated around their axes, and the orientation of the lower inner surface cooling nozzles 30a and 30b is adjusted.

  The header tubes 14a and 14b provided with the outer surface cooling nozzles 15a and 15b, the header tubes 23a and 23b provided with the upper inner surface cooling nozzles 22a and 22b, and the lower inner surface cooling nozzles 30a and 30b were provided. Pressure water is supplied to the header pipes 31a and 31b via a pressure water supply pipe (not shown).

  35a and 35b are detectors for detecting the relative positions of the outer surfaces of the flanges 1fa and 1fb of the H-section steel 1 conveyed on the pass line P with respect to the side guides 11a and 11b facing the outer surfaces of the flanges 1fa and 1fb. . In this example, six touch roller sensors that contact the outer surfaces of the flanges 1fa and 1fb of the H-section steel 1 using springs (not shown) are provided at the opposing portions of the side guides 11a and 11b (per side of the side guides 11a and 11b). 3) A sensor that detects the position of the H-section steel 1 in the left-right direction (horizontal direction) through these touch roller sensors is shown.

  And according to the position in the left-right direction (horizontal direction) of the H-section steel 1 detected by the detectors 35a, 35b, the control device 36 is independent for each of the header tubes 14a, 14b, 23a, 23b, 31a, 31b. Then, the optimum injection angles of the cooling nozzles 15a, 15b, 22a, 22b, 30a, 30b are calculated, and the adjustment of the injection angle is commanded to each cooling nozzle injection angle adjusting mechanism.

  A case where the H-section steel 1 is cooled using the cooling device having the above-described configuration will be described with reference to FIG. FIG. 3 is a diagram showing a case where the other inner surface 1 nozzle inner surface and the upper surface of the web 1w are cooled by the other upper inner surface cooling nozzle 22b.

  As shown in FIG. 3, in the structural steel cooling device of the present invention, the upper inner surface cooling located above the side guide 11b according to the change in the relative position (distance) between the H-section steel 1 and the side guide 11b. By changing the injection angle of the nozzle 22b by driving the cylinder 26b, it is possible to cool without changing the inner surface of the flange 1fa of the H-section steel 1 or the cooling region of the fillet portion.

  That is, when the gap d between the outer surface of the flange 1fb of the H-section steel 1 and the side guide 11b is increased (FIG. 3A), the cylinder 26b is driven so that the upper inner surface cooling nozzle 22b faces upward by a predetermined amount. Conversely, when the gap d between the outer surface of the flange 1fb of the H-section steel 1 and the side guide 11b is reduced, the cylinder 26b is driven so that the upper inner surface cooling nozzle 22b faces downward by a predetermined amount. By adjusting the injection angle of the upper inner surface cooling nozzle 22b in this way, even if the H-section steel 1 is bent left and right or oscillated in the side guides 11a and 11b, the target area of the H-section steel 1 is set. Cooling can be performed with almost no change.

  The cooling device of the present invention is not limited to the nozzle arrangement shown in FIG. 1 as long as nozzles for cooling the upper and lower surfaces of the shape steel web and the inner surface of the upper and lower flanges are arranged. For example, as shown in FIG. It may be a nozzle arrangement.

  In addition, the detector constituting the cooling device of the present invention may also use contact sensors (displacement meters) and non-contact sensors (displacement meters) of various structures in addition to the touch roller sensor. Needless to say.

Further, a plurality of header pipes may be provided in each side guide instead of one each.
Furthermore, the injection direction adjusting mechanism of the cooling nozzle, the nozzle position adjusting mechanism, etc. are not limited to the above-described configuration, and any device may be used as long as it exhibits the same action.

Next, the present invention will be described more specifically with reference to examples.
The cooling device A of the present invention was provided on the upstream side of the first rough universal mill C1 in the hot rolling equipment row shown in FIG. The cooling device A employs the structure shown in FIG. 1 and FIG. 2 except that the header provided with the outer surface cooling nozzle is provided in two upper and lower stages.

  The continuous cast slab having a width of 1600 mm and a thickness of 300 mm is heated to 1250 to 1300 ° C. in a heating furnace by the hot rolling equipment row shown in FIG. It was a steel piece. Subsequently, the first coarse universal mill C1, the edger mill D and the second coarse universal mill C2 perform 19-pass reciprocating rolling to form an intermediate material, and then the finish universal mill E performs one-pass shaping and rolling to obtain a flange width. H-shaped steel having a tensile strength of 500 MPa and a width of 612 mm, a web inner width of 520 mm, a flange thickness of 70 mm, and a web thickness of 80 mm.

  In the manufacturing process of the H-shaped steel, the flange outer surface of the intermediate material and the four fillets were cooled by the cooling device A having the following specifications for each pass when being rolled into the intermediate material under the following cooling conditions. At that time, the injection angle of the nozzles located above and below the cooling device for cooling the fillet is controlled during cooling so that the cooling water always hits the fillet even if the H-shaped steel swings horizontally in the cooling device. I made it.

(Upper and lower cooling device specifications and cooling conditions)
Cooling zone length: 10m
Cooling range of flange outer surface cooling: 300mm
Cooling water volume for external cooling per flange: 600 l / m ² per minute
Cooling range for fillet cooling: 100mm
Cooling water volume per fillet: 260 liters / m ² per minute
Material transport speed during cooling: 3m / sec

  The manufactured H-shaped steel was cut at the center in the rolling direction, and the temperature of the cut surface was measured with a scanning thermometer. As a result, the temperature of the cross section of the H-shaped steel was 750 to 850 ° C.

  For comparison, the method of not controlling the injection angle of the nozzle for cooling the four fillets during the cooling of the H-shaped steel (comparative example), that is, the method of keeping the injection angle of the nozzle constant is used. The manufactured H-shaped steel was cut at the center in the rolling direction, and the temperature of the cut surface was measured with a scanning thermometer.

  As a result, the temperature of the cross section of the H-section steel produced by the cooling device of the comparative example was 700 to 900 ° C., and the temperature variation was larger than that of the method of the present invention using the cooling device of the present invention. Moreover, compared with the H-section steel cooled by the cooling apparatus of the present invention, the H-section steel manufactured by the cooling apparatus of the comparative example becomes a product with a large left / right bend after finishing rolling, and the subsequent correction process It took a lot of man-hours.

  The present invention is not limited to the above example, and it goes without saying that the embodiment may be appropriately changed within the scope of the technical idea described in each claim.

  The present invention can be applied not only to cooling H-shaped steel but also to cooling parallel flange channel steel.

It is a figure which shows typically an example of the cooling device of the shape steel of this invention which enforces the cooling method of the shape steel of this invention. It is the figure which looked at FIG. 1 from the upper direction. It is explanatory drawing of the cooling method of H-section steel using the cooling device of this invention, (a) is a case where the clearance gap between the flange outer surface of H-section steel and a side guide is large, (b) is the flange outer surface and side of H-section steel It is a figure in case the gap | interval of a guide is small. It is an arrangement drawing showing an example of a hot rolling equipment row of section steel provided with a shape steel cooling device of the present invention. It is a figure which shows typically the cooling device disclosed by patent document 1. FIG. It is a figure which shows typically the cooling device disclosed by patent document 2. FIG. It is a figure explaining the problem in the cooling method using the cooling device disclosed by patent document 2, (a) is a case where H-section steel is cooled, (b) is a figure in the case of cooling parallel flange channel steel. It is.

Explanation of symbols

A Cooling device 1 H section steel 1fa, 1fb Flange 1w Web 11a, 11b Side guide 12a, 12b Slide base 22a, 22b Upper inner surface cooling nozzle 23a, 23b Header pipe 25a, 25b Link 26a, 26b Cylinder 30a, 30b Lower inner surface cooling Nozzle 31a, 31b Header pipe 33a, 33b Link 34a, 34b Cylinder 35a, 35b Detector 36 Control device

Claims (3)

A plurality of side guides provided along the pass line on at least one of the upper and lower sides of each of the pair of side guides provided across the pass line in the transport path of the shaped steel so as to be movable in the direction of contacting and separating from each other. When cooling the flange inner surface and web surface of the shape steel conveyed on the pass line with the cooling nozzle, or the flange inner surface or web surface,
Detecting a relative position of the outer surface of the flange in the steel frame to be conveyed with respect to the side guide facing the outer surface of the flange;
A method for cooling a shape steel, wherein cooling is performed while adjusting an injection angle of the cooling nozzle in accordance with the detected relative position. A pair of side guides provided across the pass line in the shaped steel conveyance path so that movement in the direction of contact with each other is possible;
A plurality of cooling nozzles that are provided along a pass line at least above or below each of the pair of side guides, and that cool the flange inner surface and the web surface of the shape steel, or the flange inner surface or the web surface;
An injection angle adjusting mechanism for adjusting the injection angle of these cooling nozzles;
A detector for detecting a relative position of the outer surface of the flange in the section steel conveyed on the pass line with respect to the side guide facing the outer surface of the flange;
A shape steel cooling device comprising a control device for adjusting an injection angle of the cooling nozzle according to the relative position detected by the detector. The shape detector according to claim 2, wherein the detector is built in the side guide.

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