Sample recovery device and sample recovery method

Abstract

To provide a sample piece recovery system and a sample piece recovery method that can identify which cast piece a sample piece was taken from and achieve space-saving when recovering a sample piece from multiple cast pieces continuously casted in a continuous casting facility.SOLUTION: A sample piece recovery system comprises: a conveying part 10 extending along a conveying direction intersecting a casting direction, and configured to send, toward downstream in the conveying direction, a first sample piece being cut off from a first cast piece and a second sample piece being cut off from a second cast piece; a recovery container 20 that is located near the most downstream end of the conveying part, and includes a first area and a second area on which the first sample piece and the second sample piece are placed, respectively; and a change part configured to change a position or a posture of the collection container so that the first area is adjacent to the most downstream end when the first sample piece falls from the most downstream end and the second area is adjacent to the most downstream end when the second sample piece falls from the most downstream end.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present disclosure relates to a sample piece collection device and a sample piece collection method.

Background Art

[0002] Patent Document 1 discloses a method for collecting a sample piece from a slab (strand) continuously cast in a continuous casting facility. The method includes forming a sample piece by cutting the slab while a cutting torch moves in synchronization with the casting speed of the slab, receiving the sample piece cut from the slab and falling with a carriage, and moving the carriage on which the sample piece is placed in a direction intersecting the casting direction of the slab to take out the sample piece from the carriage at a standby position where it does not interfere with the flow of the slab. The taken-out sample piece is subjected to component analysis, and the quality of the slab corresponding to the sample piece is determined.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in a continuous casting facility for continuously casting a plurality of slabs, molten metal is supplied from one tundish to a plurality of molds, and slabs are respectively drawn out from each mold, and a plurality of slabs are continuously cast in parallel. In this case, if the method of Patent Document 1 is used to collect sample pieces from each slab, a plurality of sample pieces will be mixed in one carriage. Therefore, even if the component analysis of the sample piece is performed, it is impossible to determine which continuous casting slab it is.

[0005] Therefore, it is conceivable to prepare a plurality of carriages so as to correspond to individual slabs. However, a large space is required to move the plurality of carriages to the standby position, and furthermore, the cost for installing the plurality of carriages increases.

[0006] This disclosure describes a sample recovery device and a sample recovery method that can identify which slab a sample was taken from when recovering sample pieces from multiple slabs continuously cast in a continuous casting facility, and that can also save space. [Means for solving the problem]

[0007] An example of a sample recovery device is configured to recover a first sample piece and a second sample piece from a first slab and a second slab that are continuously cast in a predetermined casting direction in a continuous casting facility. The example of a sample recovery device includes a transport section that extends along a transport direction intersecting the casting direction and is configured to transport a first sample piece cut off from the first slab and a second sample piece cut off from the second slab downstream in the transport direction; a recovery container located near the downstream end of the transport section and including a first region and a second region on which the first sample piece and the second sample piece are placed, respectively; and a modification section configured to change the position or orientation of the recovery container so that the first region is adjacent to the downstream end when the first sample piece falls from the downstream end, and the second region is adjacent to the downstream end when the second sample piece falls from the downstream end.

[0008] One example of a sample recovery method includes: forming a first sample piece by cutting a first slab that is continuously cast in a predetermined casting direction in a continuous casting facility; sending the first sample piece cut off from the first slab downstream in the transport direction by a transport unit extending along a transport direction intersecting the casting direction; placing the first sample piece that falls from the downstream end of the transport unit into a first area of ​​a recovery container located near the downstream end; forming a second sample piece by cutting a second slab that is continuously cast in a casting direction in a continuous casting facility; sending the second sample piece cut off from the second slab downstream in the transport direction by a transport unit; and placing the second sample piece that falls from the downstream end into a second area of ​​the recovery container that is different from the first area. [Effects of the Invention]

[0009] According to the sample recovery device and sample recovery method described herein, when recovering sample pieces from multiple cast slabs continuously cast in a continuous casting facility, it is possible to identify which cast slab a sample piece was taken from, and to save space. [Brief explanation of the drawing]

[0010] [Figure 1] Figure 1 is a schematic side view showing an example of a continuous casting facility. [Figure 2] Figure 2 is a schematic top view showing an example of a sample collection device. [Figure 3] Figure 3 is a side view of Figure 2. [Figure 4] Figure 4 is a schematic top view showing another example of a sample recovery device. [Figure 5] Figure 5 is a side view of Figure 4. [Modes for carrying out the invention]

[0011] In the following descriptions, the same reference numeral will be used for identical elements or elements with the same function, and redundant explanations will be omitted. Furthermore, in this specification, when referring to the top, bottom, right, and left of a figure, the direction of the reference numeral in the figure will be used as the reference.

[0012] [Configuration of a continuous casting facility] First, the configuration of the continuous casting equipment 100 will be explained with reference to Figure 1. The continuous casting equipment 100 includes a ladle 101, a tundish 102, a mold 103, a secondary cooling zone 104, pinch rolls 105, multiple light reduction devices 106, multiple slab support rolls 107, a slab reduction device 108, a cutting machine 109, and a sample recovery device 1.

[0013] The ladle 101 is a container for storing molten metal (molten steel) M. The tundish 102 is positioned below the ladle 101. The tundish 102 has the function of storing the molten metal M that flows out of the ladle 101 and removing inclusions (for example, granular solids made of alumina, etc.) present in the molten metal M.

[0014] The mold 103 is positioned below the tundish 102. The mold 103 forms a cast slab St (strand) by cooling the molten metal that flows out from a nozzle provided on the bottom wall of the tundish 102 and shaping it into a predetermined form.

[0015] The secondary cooling zone 104 is located downstream of the mold 103 and further cools the cast slab St that has been withdrawn from the mold 103. During this cooling process, solidification gradually occurs from the surface side of the cast slab St. In other words, unsolidified molten steel exists inside the cast slab St that has passed through the secondary cooling zone 104. The pinch roll 105 is located downstream of the secondary cooling zone 104 and withdraws the cast slab St downstream along the casting direction Ar1 while bending and straightening it.

[0016] Here, the cast slab St formed by the mold 103 consists of a solidified portion (solidified shell) where the surface has solidified, and a molten portion (unsolidified molten steel) which is molten metal in an unsolidified state inside the solidified shell. As the cast slab St moves downstream, it is cooled in the secondary cooling zone 104, etc., and the molten portion gradually solidifies, causing the solidified shell to grow. That is, as the solidified shell grows, the molten portion shrinks and the thickness of the solidified shell increases. The cast slab St is completely solidified before it reaches the cast slab reduction device 108.

[0017] Multiple light reduction devices 106 are located downstream of the secondary cooling zone 104. The light reduction devices 106 are configured to apply pressure to the solidifying cast slab St from above and below using a pair of light reduction rolls. Specifically, the light reduction devices 106 reduce the area of ​​the cast slab St near the point where the molten portion is nearing the end of solidification using a pair of light reduction rolls. This suppresses the occurrence of internal cracks and central segregation in the cast slab St.

[0018] A plurality of strand support rolls 107 are arranged side by side along the extending direction of the strand St on the downstream side of the soft reduction device 106. The strand support rolls 107 have a function of conveying the strand St downstream while cooling it.

[0019] The strand reduction device 108 is located on the downstream side of the soft reduction device 106. The strand reduction device 108 is configured to press the solidified strand St from above and below with a pair of reduction rolls. Thereby, generation of minute cavities extending in the extending direction of the strand St at the central portion of the strand St is suppressed.

[0020] The cutter 109 is located on the downstream side of the strand reduction device 108. The cutter 109 is, for example, a gas cutting torch, and cuts the strand St that has reached the cutter 109 in the width direction. Thereby, a metal piece P or a sample piece Sp as a product is formed. The sample piece Sp is subjected to component analysis by a component analysis device (not shown) or the like in order to determine the quality of the original strand St from which it was taken.

[0021] Although not shown in FIG. 1, the continuous casting facility 100 is configured to manufacture a plurality of strands St in parallel. Therefore, the continuous casting facility 100 includes a plurality of units each including a mold 103, a secondary cooling zone 104, pinch rolls 105, a plurality of soft reduction devices 106, a plurality of strand support rolls 107, a strand reduction device 108, and a cutter 109. These units may be arranged side by side, for example, along a direction perpendicular to the plane of FIG. 1.

[0022] A plurality of nozzles extending toward the mold 103 of each unit are provided on the bottom wall of the tundish 102. Thereby, the molten metal supplied to the mold 103 of each unit becomes a solidified strand St via the secondary cooling zone 104, pinch rolls 105, a plurality of soft reduction devices 106, and the strand reduction device 108 of each unit, as described above.

[0023] [Configuration of Sample Piece Recovery Device] Next, the details of the sample recovery device 1 will be described with reference to Figures 2 and 3. In the example shown in Figures 2 and 3, the continuous casting equipment 100 is equipped with six units, and six cast slabs St are formed. Hereinafter, these six cast slabs St may be referred to as cast slabs St1 to St6. Also, the sample pieces Sp taken from cast slabs St1 to St6 may be referred to as sample pieces Sp1 to Sp6. In the example shown in Figures 2 and 3, sample pieces Sp1 to Sp5 are shown being cut from cast slabs St1 to St5, respectively, almost simultaneously. However, sample pieces Sp may be cut from at least one of the cast slabs St1 to St6, or sample pieces Sp may be cut from at least two of the cast slabs St1 to St6, either almost simultaneously or at different timings.

[0024] The sample collection device 1 includes a transport unit 10, a collection container 20, a changing unit 30, and a lifting unit 40.

[0025] The transport unit 10 includes a support member 11, a chute 12 (the downstream end), a pair of chains 13, a plurality of extrusion members 14, and a drive source 15. The support member 11 extends horizontally along the transport direction Ar2, which is a direction intersecting the casting direction Ar1. The support member 11 is, for example, flat. The support member 11 extends from the vicinity of the cast slab St6 to the vicinity of the chute 12. One end (upstream end) of the support member 11 is located on the cast slab St6 side, and the other end (downstream end) of the support member 11 is located on the chute 12 side. The support member 11 is configured to support the sample piece Sp that has been cut out from the cast slab St and fallen. The support member 11 may be made of, for example, metal.

[0026] The chute 12 is positioned adjacent to the downstream end of the support member 11. The chute 12 extends downward from the downstream end of the support member 11 toward the collection container 20, sloping downwards. The chute 12 may be made of, for example, metal.

[0027] A pair of chains 13 are positioned to the sides of the support member 11. The pair of chains 13 are annular in shape. They are stretched across sprockets 16 located at the upstream and downstream ends of the support member 11, respectively. As a result, the upper parts of the pair of chains 13 extend along the transport direction Ar2 at approximately the same height as the upper surface of the support member 11. The lower parts of the pair of chains 13 may bend downward.

[0028] Multiple extrusion members 14 extend between pairs of chains 13 to connect them. The multiple extrusion members 14 are arranged at predetermined intervals in the direction in which the pairs of chains 13 extend. The spacing of the multiple extrusion members 14 may correspond, for example, to the spacing between adjacent cast slabs St1 to St6. In this case, multiple sample pieces Sp cut and dropped substantially simultaneously from at least two of the cast slabs St1 to St6 will not simultaneously be located within a single region enclosed by two adjacent extrusion members 14 and the pair of chains 13.

[0029] The drive source 15 is configured to rotate the sprocket 16. The drive source 15 may be composed of, for example, a motor. As the drive source 15 rotates the sprocket 16, the upper part of the pair of chains 13 moves along the transport direction Ar2 from the upper end to the lower end of the support member 11, and the lower part of the pair of chains 13 moves along the transport direction Ar2 from the lower end to the upper end of the support member 11. In the example in Figure 3, the pair of chains 13 rotate clockwise. As a result, the multiple extrusion members 14 also move along the transport direction Ar2 from the upper end to the lower end of the support member 11 on the upper surface of the support member 11.

[0030] When a sample piece Sp is placed on the support member 11, the extrusion member 14, which has moved from the upstream side of the sample piece Sp, comes into contact with the sample piece Sp and pushes it to the lower end of the support member 11. The sample piece Sp, pushed to the lower end of the support member 11 by the extrusion member 14, falls towards the chute 12, slides down the chute 12, and then falls into the collection container 20. In other words, the transport unit 10 is configured to transport the sample piece Sp downstream in the transport direction Ar2 to the collection container 20.

[0031] The collection container 20 is located near the lower end of the chute 12, adjacent to the lower end of the chute 12 (i.e., the downstream end of the transport section 10). The collection container 20 is configured to collect the sample pieces Sp transported by the transport unit 10. The collection container 20 has a bottomed cylindrical shape. In the examples shown in Figures 2 and 3, the collection container 20 has a circular shape when viewed from above.

[0032] Multiple partition members 21 are provided inside the collection container 20. In the example shown in Figure 2, the multiple partition members 21 are provided inside the collection container 20 so as to divide the space inside the collection container 20 into six sections. As a result, the collection container 20 is divided into multiple regions (six regions R1 to R6 in Figure 2) by the multiple partition members 21. These regions R1 to R6 are arranged along a circular shape (along the circumferential direction of the collection container 20).

[0033] The modification unit 30 is configured to change the orientation of the collection container 20. In the examples shown in Figures 2 and 3, the modification unit 30 includes a rotating shaft 31, a rotating base 32, and a plurality of rollers 33.

[0034] The rotating shaft 31 is provided on the floor surface so as to extend vertically upward from the floor surface, as illustrated in Figure 3. The rotating shaft 31 is configured to be rotatable relative to the floor surface. The rotating platform 32 is provided at the upper end of the rotating shaft 31. Therefore, the rotating platform 32 is configured to rotate around the rotating shaft 31 which extends vertically. The rotating platform 32 may be rotated manually by an operator, or it may be rotated by a drive source (not shown). A collection container 20 can be placed on the upper surface of the rotating platform 32.

[0035] Multiple rollers 33 are arranged in a line along the circumferential direction of the rotation axis 31. Multiple rollers 33 support the lower surface of the turntable 32. Therefore, when the turntable 32 rotates, it rotates more smoothly due to the multiple rollers 33.

[0036] The modification unit 30, having the above configuration, is configured to allow the collection container 20, which is placed on the turntable 32, to rotate around the rotation axis 31 (see arrow Ar3 in Figure 2). As a result, the positions of regions R1 to R6 relative to the chute 12 change as the collection container 20 rotates. For example, when region R1 is positioned adjacent to the chute 12 due to the rotation of the collection container 20 (see Figure 2), the sample pieces Sp transported by the transport unit 10 are contained in region R1 of the collection container 20. The same applies to the other regions R2 to R5. In other words, by rotating the collection container 20 and collecting the sample pieces Sp into the collection container 20 so that each of the sample pieces Sp1 to Sp6 is contained in regions R1 to R6, mixing of sample pieces Sp1 to Sp6 is prevented.

[0037] The lifting unit 40 is configured to lift the recovery container 20 and move it between the turntable 32 and a position away from the conveying unit 10 (for example, a position that does not interfere with the cast slab St being produced by the continuous casting equipment 100) (see arrow Ar4 in Figure 3). The lifting unit 40 may be, for example, an overhead crane or hoist installed on the ceiling of the building of the continuous casting equipment 100.

[0038] [Effect] In the above example, sample pieces Sp1 to Sp6, each cut off from slabs St1 to St6, are collected in the same collection container 20. Moreover, during collection, sample pieces Sp1 to Sp6 are placed in different regions R1 to R6 of the collection container. Therefore, when collecting sample pieces Sp from multiple slabs St continuously cast in the continuous casting equipment 100, it is possible to identify which slab St each sample piece Sp was taken from based on the region in the collection container 20 where the sample piece Sp is placed. Furthermore, since the identification of sample pieces Sp can be achieved simply by changing the orientation of a single collection container 20, space can also be saved.

[0039] In the above example, the collection container 20 includes a partition member 21 that divides regions R1 to R6. Therefore, the presence of the partition member 21 prevents, for example, sample piece Sp1 from entering other regions R2 to R6. As a result, mixing of sample pieces Sp is eliminated, making it possible to reliably identify which cast slab St each sample piece Sp was taken from.

[0040] In the above example, the modification unit 30 is configured to allow the recovery container 20 to rotate around the rotation axis 31, and regions R1 to R6 are arranged along the circumferential direction of the recovery container 20 (the circumferential direction of the rotation axis 31). Therefore, since the identification of sample fragments Sp can be achieved by simply rotating one recovery container 20, further space saving is possible.

[0041] In the above example, the collection container 20 is lifted by the lifting unit 40 and transported between the turntable 32 and a position away from the transport unit 10. Therefore, by moving the collection container 20 containing the sample fragments Sp to a location away from the transport unit 10 using the lifting unit 40, it becomes possible for an operator to safely remove the sample fragments Sp from the collection container 20. Furthermore, while the sample fragments Sp are being removed from the collection container 20, another collection container can be placed on the turntable 32, allowing for the collection of sample fragments Sp using that other container. This makes it possible to continuously collect sample fragments Sp.

[0042] [Differentiation] The disclosures herein should be considered in all respects to be illustrative and not restrictive. Various omissions, substitutions, and modifications may be made to the above examples without departing from the claims and the gist thereof.

[0043] (1) Multiple rollers 33 may be provided on the bottom surface of the collection container 20. In this case as well, the collection container 20 can change its position or orientation.

[0044] (2) The collection container 20 may have a shape other than a circle. For example, as illustrated in Figures 4 and 5, the collection container 20 may have a rectangular shape. In this case, the multiple partition members 21 are arranged to line up along the longitudinal direction of the collection container 20. Therefore, regions R1 to R6 are also lined up along the longitudinal direction of the collection container 20. In the example of Figures 4 and 5, the modification unit 30 may be a plurality of wheels rotatably attached to the collection container 20. The modification unit 30 may be configured to allow the collection container 20 to move linearly along the movement direction Ar5, which is a direction intersecting the transport direction Ar2.

[0045] In this case as well, similar to the examples in Figures 2 and 3, the position of regions R1 to R6 relative to the chute 12 changes as the collection container 20 moves. Therefore, by moving the collection container 20 and collecting the sample pieces Sp1 to Sp6 into the collection container 20 so that each sample piece Sp1 to Sp6 is contained in a region R1 to R6, mixing of sample pieces Sp1 to Sp6 is prevented. Thus, in the examples in Figures 4 and 5, it is possible to identify which slab St a sample piece Sp was taken from, depending on the region in the collection container 20 where the sample piece Sp is placed. Moreover, since the identification of sample pieces Sp can be achieved by simply changing the position of one collection container 20, space saving is also possible.

[0046] [Other examples] Example 1. An example of a sample recovery device is configured to recover a first sample piece and a second sample piece from a first slab and a second slab that are continuously cast in a predetermined casting direction in a continuous casting facility. The example of a sample recovery device includes a transport section that extends along a transport direction intersecting the casting direction and is configured to transport a first sample piece cut off from the first slab and a second sample piece cut off from the second slab downstream in the transport direction; a recovery container located near the downstream end of the transport section and including a first region and a second region on which the first sample piece and the second sample piece are placed, respectively; and a modification section configured to change the position or orientation of the recovery container so that the first region is adjacent to the downstream end when the first sample piece falls from the downstream end, and the second region is adjacent to the downstream end when the second sample piece falls from the downstream end. In this case, the first and second sample pieces, cut from the first and second slabs respectively, are collected in the same collection container. Moreover, during collection, the first and second sample pieces are placed in different areas of the collection container, the first and second areas, respectively. Therefore, when collecting sample pieces from multiple slabs continuously cast in a continuous casting facility, it is possible to identify which slab a sample piece was taken from based on the area in the collection container where the sample piece is placed. Furthermore, since the identification of sample pieces can be achieved simply by changing the position or orientation of a single collection container, space can also be saved.

[0047] Example 2. In the apparatus of Example 1, the collection container may include a partition member that separates the first region and the second region. In this case, the presence of the partition member prevents the first sample piece from entering the second region, and vice versa. Therefore, since the mixing of sample pieces is eliminated, it becomes possible to reliably identify which casting the sample piece was taken from.

[0048] Example 3. In the apparatus of Example 1 or Example 2, the modified part is configured such that the collection container can be rotated around a rotation axis extending in the vertical direction, and the first region and the second region may be aligned along the circumferential direction of the rotation axis. In this case, since the identification of sample pieces can be achieved by simply rotating a single collection container, further space saving becomes possible.

[0049] Example 4. In the apparatus of Example 1 or Example 2, the modified part is configured to allow the collection container to move in a direction of movement intersecting the transport direction, and the first region and the second region may be aligned along the direction of movement. In this case, since the identification of sample pieces can be achieved by moving a single collection container in a predetermined direction of movement, further space saving is possible.

[0050] Example 5. The apparatus of Example 1 or Example 2 may further include a lifting unit configured to lift and move the collection container between the vicinity of the downstream end and a location away from the transport unit. In this case, by moving the collection container containing the sample pieces to a location away from the transport unit using the lifting unit, it becomes possible for an operator to safely remove the sample pieces from the collection container.

[0051] Example 6. The apparatus of Example 3 may further include a lifting section configured to lift and move the recovery container between the vicinity of the downstream end and a location away from the conveying section. In this case, the same effects and advantages as in Example 5 can be obtained.

[0052] Example 7. The apparatus of Example 4 may further include a lifting section configured to lift and move the recovery container between the vicinity of the downstream end and a location away from the conveying section. In this case, the same effects and advantages as the apparatus of Example 5 can be obtained.

[0053] Example 8. An example of a sample piece recovery method includes: forming a first sample piece by cutting a first slab that is continuously cast in a predetermined casting direction in a continuous casting apparatus; sending the first sample piece cut off from the first slab downstream in the transport direction by a transport section extending along a transport direction intersecting the casting direction; placing the first sample piece that falls from the downstream end of the transport section into a first area of ​​a recovery container located near the downstream end; forming a second sample piece by cutting a second slab that is continuously cast in a casting direction in a continuous casting apparatus; sending the second sample piece cut off from the second slab downstream in the transport direction by a transport section; and placing the second sample piece that falls from the downstream end into a second area of ​​the recovery container different from the first area. In this case, the same effects and advantages as the apparatus in Example 1 can be obtained. [Explanation of Symbols]

[0054] 1...Sample recovery device, 10...Conveying unit, 12...Cute (downstream end), 20...Recovery container, 21...Partition member, 30...Change unit, 40...Lifting unit, 100...Continuous casting equipment, Ar1...Casting direction, Ar2...Conveying direction, Ar5...Movement direction, R1~R6...Region, Sp,Sp1~Sp5...Sample pieces, St,St1~St6...Casting slabs.

Claims

1. A sample recovery device configured to recover a first sample piece and a second sample piece from a first slab and a second slab, respectively, which are continuously cast in a predetermined casting direction in a continuous casting facility and are arranged in parallel in a direction intersecting the casting direction, A conveying unit extending along a conveying direction intersecting the casting direction, and configured to transport the first sample piece cut off from the first cast slab and the second sample piece cut off from the second cast slab downstream in the conveying direction, A collection container located near the downstream end of the transport section and including a first region and a second region on which the first sample piece and the second sample piece are placed, A sample recovery device comprising a modification unit configured to change the position or orientation of the recovery container such that when the first sample piece falls from the downstream end, the first region is adjacent to the downstream end, causing the first sample piece to fall into the first region, and when the second sample piece falls from the downstream end, the second region is adjacent to the downstream end, causing the second sample piece to fall into the second region.

2. The apparatus according to claim 1, wherein the collection container includes a partition member that separates the first region and the second region.

3. The modified part is configured to allow the collection container to rotate around a rotation axis extending in the vertical direction, The apparatus according to claim 1 or 2, wherein the first region and the second region are aligned along the circumferential direction of the rotation axis.

4. The modified part is configured to allow the collection container to move in a direction intersecting the transport direction, The apparatus according to claim 1 or 2, wherein the first region and the second region are aligned along the direction of movement.

5. The apparatus according to claim 1 or 2, further comprising a lifting unit configured to lift and move the collection container between the vicinity of the downstream end and a location away from the transport unit.

6. The apparatus according to claim 3, further comprising a lifting unit configured to lift and move the collection container between the vicinity of the downstream end and a location away from the transport unit.

7. The apparatus according to claim 4, further comprising a lifting unit configured to lift and move the collection container between the vicinity of the downstream end and a location away from the transport unit.

8. In a continuous casting apparatus, a first cast slab is continuously cast along a predetermined casting direction, and a first sample piece is formed by cutting the slab. The first sample piece cut off from the first cast slab is sent downstream in the conveying direction by a conveying section extending along the conveying direction intersecting the casting direction, The first sample piece falling from the downstream end of the transport section is placed in the first area of ​​the collection container located near the downstream end, In the continuous casting apparatus, a second cast slab is continuously cast along the casting direction and is arranged in parallel with the first cast slab in a direction intersecting the casting direction. This second cast slab is then cut to form a second sample piece. The second sample piece cut off from the second cast slab is sent downstream in the conveying direction by the conveying unit, A method for recovering a sample piece, comprising placing the second sample piece falling from the downstream end into a second region of the recovery container that is different from the first region.

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