JP2015063356A - Turnover apparatus for steel plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a turnover apparatus for steel plates which can reverse without occurrence of surface flaws even in steel plates varying significantly in plate thickness difference.SOLUTION: A turnover apparatus for steel plates includes a feed-side table erecting a mounted steel plate and a reception-side table receiving the steel plate erected on the feed-side table, and the feed-side table consists of a feed-side table part on which steel plates are mounted and a feed-side claw part supporting the end part of the erected steel plate. The reception-side table includes a reception-side table part on which steel plates are mounted, a reception-side claw part supporting the end part of the erected steel plate and an ascent/descent table which rotates with the table end part opposite to the claw part as the center and corrects a plate thickness difference. The surface of claw part of the reception-side table coming in contact with the end part of the steel plate is inclined so as to be separated further from the end part of the steel plate with decreasing rotation angle of the ascent/descent table.

Description

  The present invention relates to a reversing device for reversing a thick steel plate having a thickness of several tens to several hundreds of mm obtained by hot rolling or forging with two rotating tables.

  Thick steel plates, especially for steel plates used in nuclear power plants, etc., which have strict requirements not only on internal quality but also on surface quality, are made by hot rolling or forging steel materials (slabs, steel ingots). Thereafter, surface care such as surface inspection and grinding on both the front and back surfaces may be performed, and for that purpose, it is necessary to invert the thick steel plate several times. Hereinafter, the thick steel plate is also simply referred to as “steel plate”.

Conventionally, when reversing a steel plate, for example, the steel plate is lifted and reversed with a crane using a lifting magnet or a wire. However, this method has a problem that the work is dangerous and complicated, and the steel sheet is easily wrinkled. Therefore, as an apparatus for reversing a steel plate, for example, a device for reversing using two tables as in the prior art described in Patent Document 1 has been proposed. As shown in FIG. 1, the reversing device is composed of two tables (feeding side table 2 and receiving side table 3) which are rotatably attached to two rotation shafts provided in parallel. After placing the steel plate 1 on the feed side table 2, both the tables 2 and 3 are rotated in the vertical direction so that the tables 2 and 3 are opposed to each other on the feed side slightly from the vertical. After rotating the steel plate 1 from the vertical direction to the receiving side table 2 and delivering the steel plate 1 to the receiving side table 3, the steel plate 1 was reversed again by rotating both the tables 2 and 3 back to the horizontal state. .
However, the method of Patent Document 1 has a problem that when the steel sheet is delivered, the impact when the steel sheet falls on the table is large, and surface defects are likely to occur.

  As another reversing device, for example, in Patent Document 2, a base that can be raised and lowered, a pair of workpiece mounting plates that are rotatably provided at both ends of the base, and the base is raised. When the base is lowered so that the workpiece placement plate is rotated as much as possible and the workpiece placed on one workpiece placement plate can be transferred to the other workpiece placement plate. A workpiece reversing device comprising a cam mechanism for rotating a workpiece placing plate so as to face each other is disclosed in Patent Document 3, a raising device for raising a steel plate in the width direction, and the raising device in the width direction. A receiving portion that supports the surface side of the steel plate that has been erected so that it does not fall down, and a side surface that is positioned below the steel plate that is supported in an upright state by the receiving portion, and this side surface is moved to the opposite receiving portion side. Steel plate reversing device with conveyor device , Patent Document 4, lift the steel plate by a swing arm front end side is swingable in the vertical direction relative to the conveying device, the steel sheet reversing apparatus for turning in the air have been proposed. However, the devices of Patent Documents 2 and 3 have the problem that surface flaws are likely to occur when reversing the steel sheet, as in Patent Document 1, and in addition to increasing the thickness and weight of steel sheets in recent years. There is a problem of not being able to respond sufficiently. Moreover, since the apparatus of patent document 4 adsorb | sucks a steel plate to an arm with a magnet and inverts, it is not suitable for inversion of a heavy heavy steel plate.

Japanese Patent Laid-Open No. 02-291339 Japanese Utility Model Publication No. 06-027036 Japanese Patent Laid-Open No. 10-072146 Japanese Patent Laid-Open No. 08-073027 JP 2013-123714 A

  By the way, the steel plate obtained by hot rolling or hot forging, which is the subject of the present invention, varies greatly in the thickness range of several tens to several hundreds of meters. However, since the reversing device that reverses while sandwiching the plates between the two tables disclosed in Patent Document 1 does not consider the variation in the thickness of the steel plates, a gap is formed between the two tables, and the steel plates receive when they are reversed. There is a problem that the impact when falling on the side table is large and wrinkles are likely to occur.

  As an apparatus for solving this problem, the applicant applies a table on the receiving side of the two tables, a table on the side sending the steel plate (feeding table) and a table on the side receiving the reversed steel plate (receiving table). An apparatus that prevents the occurrence of surface flaws by attaching a lifting table that corrects the difference in plate thickness has been developed and separately proposed in Patent Document 5.

  However, when this device is used, the impact when transferring the steel plate is alleviated, but when the elevating table that corrects the plate thickness difference of the steel plate is lowered, a surface scratch different from the conventional case may occur. It has become clear. For this reason, in destinations where demands on surface quality are severe, reversal was also performed using a crane as usual.

  The present invention has been made in view of the above-mentioned problems of the prior art, and its purpose is to reverse a steel sheet that can be reversed without causing surface flaws even in a steel sheet in which the thickness difference varies greatly. To propose a device.

  As a result, the inventors have intensively studied to solve the above problems, and as a result, the scratches that occur on the steel sheet when the elevating table is lowered are steel sheets that are transferred to the receiving table as the elevating table is lowered. In order to prevent the end part from coming into contact with the claw part of the receiving side table and the steel plate to be displaced on the table accordingly, and therefore to prevent scratches when the lifting table is lowered, the receiving side It has been found that it is effective to give the claw portion of the table a taper so that the end portion of the steel plate is separated from the claw portion of the receiving table as the elevating table is lowered, leading to the development of the present invention. .

  That is, the present invention has a feed-side table that stands on a mounted steel plate that can be rotated 90 ° or more in the vertical direction from a horizontal state around a fixed rotating shaft that extends in the horizontal direction, and is parallel to the fixed rotating shaft. A steel plate reversing device having a receiving side table for receiving a steel plate standing on the sending side table, which is rotatable about 90 ° in a vertical direction from a horizontal state around a fixed rotation axis, the feeding side table comprising: The table portion for placing the steel plate and the claw portion for supporting the standing steel plate end portion, and the receiving table includes a table portion for placing the steel plate, and a claw portion for supporting the standing steel plate end portion. , Which is composed of a lifting table that rotates around the rotation axis of the table end opposite to the claw and corrects the difference in plate thickness, and that is in contact with the steel plate end of the claw of the receiving table But the lifting table The steel plate reversing device is characterized in that the smaller the rotation angle of the bull is, the more inclined it is from the steel plate end.

  The steel plate reversing device according to the present invention is characterized in that the inclination of the receiving table claw portion is provided by providing an inclination to the thickness of the liner.

  According to the present invention, since the steel plate can be reversed without causing impact or slippage on the steel plate, it can be suitably used as a steel plate reversing device for applications in which the demand for surface quality is severe.

It is a figure explaining the inversion method of the steel plate in the conventional inversion apparatus which inverts a steel plate using two tables. It is a figure explaining the inversion method of the steel plate in the conventional steel plate inversion apparatus in which plate | board thickness correction | amendment is possible. In the reversing device of FIG. 2, it is a figure explaining the mechanism in which a damage | wound generate | occur | produces in a steel plate at the time of a raising / lowering table fall. It is a figure explaining the mechanism which prevents the damage | wound at the time of a raising / lowering table fall in the inversion apparatus of this invention.

  FIG. 2 is a reversal method in a steel plate reversing apparatus that eliminates the drawbacks of the method of reversing a steel plate using the reversing device of FIG. FIG. Here, the reversing device shown in FIG. 2 includes a feed-side table 2 that stands up on a mounted steel plate 1 that can be rotated 90 ° or more in a vertical direction from a horizontal state around a fixed rotation shaft 2c extending in a horizontal direction. A steel plate having a receiving side table 3 that receives a steel plate raised from the feeding side table 2 and that is rotatable by 90 ° or more in a vertical direction from a horizontal state around a fixed rotating shaft 3c parallel to the fixed rotating shaft 2c. It is a reversing device. The feed side table 2 is composed of a steel plate placing portion 2a for placing the steel plate 1 and a claw portion 2b for supporting the standing end portion of the steel plate, and the receiving side table 3 places the steel plate. Steel plate placing portion 3a, claw portion 3b that supports the end portion of the upstanding steel plate, and a lifting table that rotates around a rotation shaft 3d of the table end opposite to the claw portion to correct a difference in plate thickness 3e.

  In reversing the steel plate 1 with the apparatus of FIG. 2, first, the steel plate 1 is placed on the steel plate placing portion 2a of the feed side table with the end abutting against the claw portion 2b (FIG. 2 (a). )). Next, in order to prepare for receiving the steel plate 1, the receiving side table 3 is rotated up to an angle (for example, 95 °) slightly larger than 90 ° (FIG. 2 (b)), and then the feeding side table 2 is set. Is rotated to an angle slightly smaller than 90 ° (for example, 85 °) in a state where the steel plate 1 is placed, and the steel plate is erected (FIG. 2C). Next, the lifting / lowering table 3e provided on the receiving side table 3 is brought into contact with the steel plate 1 at the claw portion side end of the lifting / lowering table 3e with the rotation shaft 3d at the upper part (opposite side of the claw portion) of the receiving side table 3b as a center. Rotate (elevate) to (Fig. 2 (d)). At this time, the inclination angle seen from the receiving side of the lifting table is set to be less than 90 °. Next, the steel plate 1 is pressed against the receiving table 3b by a pusher (not shown) provided on the feeding side table 2b and delivered (FIG. 2 (e)). Next, the receiving side table 3 is rotated counterclockwise to return to the horizontal state (FIG. 2 (f)). Finally, the lift table 3e that has been raised is reversely rotated (lowered), and the reversal of the steel sheet 1 is completed (FIG. 2 (g)).

According to the method of FIG. 2 described above, since the impact when the steel plate falls on the receiving table is small, the steel plate can be reversed without causing surface scratches until the step of FIG. However, a surface flaw occurs in the process of FIG.
FIG. 3 explains the mechanism by which surface flaws occur during the transition from (f) to (g) in FIG. As can be seen from FIG. 3 (a), when the raised lift table is lowered, the end portion of the steel plate 1 placed on the lift table 3e in contact with the claw portion 3b of the receiving table is clawed. It descends so as to bite into the inside of the part 3b. As a result, the end portion of the steel plate 1 descends while sliding on the surface of the claw portion 3b, and slides on the lifting table 3e so that the entire steel plate 1 is pushed back from the claw portion 3b. As a result, as shown in FIG. 3 (b), scratches are generated on the end portion and the lower surface side of the steel plate.

  Therefore, in order to avoid the above problems, the present invention prevents the end of the steel plate placed on the lifting table from being caught in the claw when the lifting table is lowered. The surface which contacts a steel plate edge part is provided with the inclination, and it was made to separate from a steel plate edge part, so that a raising / lowering table fell.

  FIG. 4 shows the positional relationship between the steel plate end and the claw surface (liner surface) that accompanies the lowering of the lifting table when the liner attached to the claw of the receiving table shown in FIG. 3 is inclined. It is shown. In FIG. 4, the liner is inclined and the steel plate end and the claw surface (liner surface) are separated from each other as the elevating table is lowered. Therefore, as shown in FIG. Can be lowered together with the lifting table without the end portion contacting or biting into the claw surface (liner surface). Therefore, in the reversing device shown in FIG. 4, the steel plate can be reversed without causing scratches on the end or lower surface of the steel plate.

  Here, the inclination provided in the claw part of the receiving table is given by giving the liner 4 attached to the claw part an inclination in FIG. 4, but the claw part itself is provided with an inclination so that the liner 4 has the same thickness. It is good. In addition, the inclination provided in the claw portion does not need to be linear as shown in FIG. 4 as long as the lift table is lowered, as long as the steel plate end portion and the claw surface (liner surface) are separated from each other, For example, it may be arcuate. If the slope to be applied is too large, the end of the steel sheet is in line contact with the claw part, stress is concentrated on the end of the steel sheet, and conversely, scratches are likely to occur. .

A steel plate with a width of 5000 mm, a length of 4520 mm, and a thickness of 450 mm and a mass of 80 tons used for the containment vessel of the principle furnace is manufactured by forging. Went.
In addition, the inversion method of the steel plate at the time of grinding and quality inspection of the steel plate surface was performed under the following three conditions, and the time required for the inversion and the presence or absence of surface flaws accompanying the inversion were compared.
<Inversion method>
・ Method 1: Lifting with a wire using a crane and inverting (Comparative example)
Method 2: Method using the inverting device shown in FIG. 2 (comparative example)
Method 3: Method using the reversing device shown in FIG. 4 (invention example)

  The results are shown in Table 1. From Table 1, it can be seen that according to the method (No. 3) of the present invention, the steel sheet can be reversed in a short time without generating surface defects on the steel sheet surface.

  The technology of the present invention can be applied not only to thick steel plates but also to the reversal of semi-finished products such as slabs.

1: Thick steel plate (steel plate)
2: Feed-side table 2a: Feed-side table steel plate placement portion 2b: Feed-side table claw portion 2c: Feed-side table rotating shaft 3: Receive-side table 3a: Receive-side table steel plate placement portion 3b: Receiving side Table claw portion 3c: Rotating shaft of receiving table 3d: Rotating shaft of lifting table 3e: Lifting table of receiving table 4: Liner

Claims (2)

A feed-side table that stands on a mounted steel plate that can be rotated 90 ° or more in a vertical direction from a horizontal state around a fixed rotating shaft that extends in the horizontal direction, and a fixed rotating shaft that is parallel to the fixed rotating shaft. A steel plate reversing device having a receiving table for receiving a steel plate standing upright on the sending side table, which is rotatable to 90 ° or more in a vertical direction from a horizontal state,
The feeding side table is composed of a table portion for placing a steel plate and a claw portion for supporting an upright steel plate end,
The receiving side table rotates about the rotation axis of the table portion on which the steel plate is placed, the claw portion supporting the standing steel plate end portion, and the table end portion on the side opposite to the claw portion, and the difference in thickness It is composed of a lifting table that corrects, and
A steel plate reversing device, wherein a surface of the pawl portion of the receiving table that comes into contact with the steel plate end portion is inclined so as to be separated from the steel plate end portion as the rotation angle of the elevating table is smaller. 2. The steel sheet reversing device according to claim 1, wherein the inclination of the receiving table claw portion is provided by giving an inclination to the thickness of the liner.

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