Descaling device

Abstract

To suppress corrosion of peripheral equipment such as a rolling housing due to high pressure water and rebound water.SOLUTION: A descaling device injects high pressure water to a surface of a steel material 40 supported by a feed roller 11 from nozzles 14, 16, and removes scales formed on the surface of the steel material 40. The descaling device comprises a pillar part 10A which supports a chock 11B (bearing box) of the feed roller 11, and a contact possible part at a position where high pressure container from the nozzles 14, 16 can contact in the pillar part 10A is protected by proving a protective member for protecting from high pressure water.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a descaling device for removing scales on the surface of a steel material to be rolled in a rolling line using high-pressure water. [Background technology]

[0002] In a hot rolling line for steel, a slab (steel) is loaded into a heating furnace and heated for several hours at a temperature range of, for example, approximately 1100°C to 1300°C. The heated slab is then hot-rolled into a predetermined shape to produce a rolled steel sheet. Primary scale forms on the surface of the slab in the heating furnace, and secondary scale forms after the slab is removed from the heating furnace. If the slab is rolled without removing this scale, the surface scale will penetrate into the surface of the steel. When the scale is transferred to the steel in this way, scale defects are formed. These scale defects significantly impair the surface properties of the hot-rolled material and also serve as starting points for cracks during bending. Therefore, scale defects have a significant impact on product quality.

[0003] Therefore, descaling devices have conventionally been used to remove scale that forms on the surface of the rolled material. Descaling devices perform descaling by spraying high-pressure water from a descaling nozzle onto the surface of the rolled material to remove the scale. Examples of such descaling devices include those described in Patent Document 1 and Patent Document 2.

[0004] In descaling, if high-pressure water is sprayed when no steel material is present or if the width of the steel material is narrower than the width at which the high-pressure water is sprayed, the high-pressure water may be sprayed onto the surface of the apron. If high-pressure water is sprayed onto the surface of the apron, the high-pressure water may erode the apron, or the high-pressure water that bounces off the surface of the apron may erode surrounding equipment. For this reason, Patent Document 1 provides openings in the apron to prevent apron erosion caused by the collision of high-pressure water.

[0005] Furthermore, Patent Document 2 discloses the provision of a protector to a spray header equipped with a spray unit that sprays a main water flow and an auxiliary spray unit that sprays a covering air flow, thereby suppressing erosion of the spray header due to splashed water. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-14502 [Patent Document 2] Japanese Patent Application Publication No. 2017-170513 Summary of the Invention [Problem to be solved by the invention]

[0007] However, there is a risk that high-pressure water sprayed from the descaling device when the steel material is not present may come into direct contact with equipment around the steel material being descaled, or that high-pressure water may come into contact with the equipment after it has rebounded from the steel material. In particular, the transport rollers that support the steel material during descaling are located nearby, and there is a risk that the high-pressure water may come into contact with the columns that support the chocks of the transport rollers.

[0008] For example, when descaling is performed on the entry side of a rolling roll, high-pressure water is sprayed onto a steel material supported by feed rollers (transport rollers) provided at the entry side of the rolling housing of the rolling mill. In this case, the high-pressure water may come into contact with the rolling housing of the rolling mill body, causing erosion of the rolling housing.

[0009] However, the descaling devices described in Patent Documents 1 and 2 cannot prevent erosion of peripheral equipment other than the descaling device, particularly the rolling housing. The present invention has been made in light of the above-mentioned points, and aims to suppress erosion of surrounding equipment such as rolling mill housings caused by high-pressure water and splashing water. [Means for solving the problem]

[0010] In order to solve the problem, one aspect of the present invention is a descaling device that sprays high-pressure water from a nozzle onto the surface of steel material supported by conveying rollers to remove scale formed on the surface of the steel material, and is provided with a pillar portion that supports the chocks (bearing housings) of the conveying rollers, and a protective member that protects the contactable portion of the pillar portion, which is a position where the high-pressure water from the nozzle can come into contact, from the high-pressure water. [Effects of the Invention]

[0011] According to the aspects of the present invention, it is possible to suppress corrosion of pillars located near the transport rollers that support steel materials during descaling, for example, corrosion of pillars of a rolling housing. The inventors have found that the rolling housing may be eroded by splashing water from high-pressure water, and the present invention makes it possible to suppress the erosion of the rolling housing, i.e., to suppress adverse effects on rolling. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a conceptual diagram illustrating a hot rolling line according to an embodiment of the present invention. [Figure 2] FIG. 2 is a diagram showing an example of the arrangement of feed rollers provided in a rolling housing, nozzles of a descaling device, and the like. [Figure 3] 1A is a diagram illustrating a chock support portion in a column portion of a rolling housing. (a) is a diagram of the inner surface of the column portion of the rolling housing (the surface facing the corresponding column portion). (b) is an enlarged view of the part enclosed by the frame in (a), a perspective view for explaining the installation seat surface, and a diagram illustrating a state in which a part of the protrusion portion is not detachable. [Figure 4] FIG. 10 is a diagram showing a state in which the mounting block is not fixed to the protruding portion. [Figure 5] 1A and 1B are diagrams showing a mounting block, in which (a) is a plan view seen from the mounting surface side, and (b) is a side view. [Figure 6] FIG. 4 is a schematic side view illustrating a protective member. [Figure 7] 10A and 10B are diagrams illustrating bolt fastening for fixing the mounting block and the protective plate. [Figure 8] FIG. 10 is a front view of the protection plate illustrating the flow straightening portion. DETAILED DESCRIPTION OF THE INVENTION

[0013] Next, an embodiment of the present invention will be described with reference to the drawings. An example of the flow of a hot rolling line is shown in Figure 1. In Figure 1, the symbol PL denotes a pass line. In the hot rolling line, a slab 40 (steel material 40) is heated in a heating furnace 2. The slab 40 (steel material 40) extracted from the heating furnace 2 is rough rolled in a roughing mill and then finish rolled in a finishing mill.

[0014] (composition) In this embodiment, as shown in Fig. 2, a descaling device is provided at the entrance side of the roughing mill R1 (rolling mill) located at the most upstream of the row of roughing mills 3. The descaling device is configured to spray high-pressure water onto the surface of the slab 40 to remove scale from the surface layer of the slab 40 before it is rough rolled.

[0015] <Rough rolling mill R1> In this embodiment, the roughing mill R1 has a pair of work rolls WR constituting rolling rolls arranged in a rolling housing 10. On the entry side of the work rolls WR, a feed roller 11 is arranged to feed the slab 40 toward the work rolls WR. The feed roller 11 constitutes a transport roller that transports the steel material 40. In this embodiment, a configuration including two feed rollers 11 is exemplified.

[0016] The feed roller 11 includes a roll 11A, which is the main body of the feed roller, and left and right chocks 11B. The chocks 11B are bearing housings that rotatably support the ends of the roll 11A. In this embodiment, one chock 11B supports the two ends of the two rolls 11A that face the same direction.

[0017] The rolling housing 10 has a pair of left and right column portions on each of the entry side and exit side of the work roll WR. The left and right column portions 10A on the entry side are arranged opposite each other in the axial direction of the feed roller 11. That is, the rolling housing 10 has a pair of column portions 10A that face each other in the width direction of the steel material 40. Each of the column portions 10A has a portion that supports a chock 11B on the surface facing inward in the left-right direction. Specifically, as shown in Fig. 3, each pillar 10A has a protruding portion 19 that protrudes toward the other pillar 10A. The upper surface of the protruding portion 19 forms the mounting seat 12 on which the chock 11B is mounted (see Fig. 6).

[0018] <Descaling device> 2, the descaling device is configured to be able to spray high-pressure water toward the surface of the steel material 40 located between two feed rollers 11. In other words, it is configured to be able to spray high-pressure water toward the surface of the steel material 40 supported by the two feed rollers 11.

[0019] The descaling device comprises an upper descaling header 15 and a lower descaling header 13 . The upper descaling header 15 is disposed above the feed rollers 11 and extends in the width direction of the plate. The upper descaling header 15 is equipped with a plurality of nozzles 16 arranged in the width direction of the plate. Each nozzle 16 is disposed so as to be able to spray high-pressure water toward the upper surface of the steel material 40. As shown in FIG. 2, the spray axis of the water from each nozzle 16 is inclined upstream in the rolling direction and is set so as to spray as far as possible toward the space between the two feed rollers 11.

[0020] The lower descaling header 13 is disposed below the feed rollers 11 and extends in the width direction of the plate. The lower descaling header 13 is equipped with a plurality of nozzles 14 arranged in the width direction of the plate (see FIG. 6). Each nozzle 14 is disposed so that it can spray high-pressure water toward the underside of the steel material 40. As shown in FIG. 2, the spray axis of the water sprayed from each nozzle is inclined upstream in the rolling direction and is set to pass between the two feed rollers 11. In addition, it is set so that the high-pressure water reflected by the underside of the steel material 40 (rebound water) passes between the two feed rollers 11 as much as possible.

[0021] High-pressure water can be supplied to the upper descaling header 15 and the lower descaling header 13 via piping (not shown).

[0022] <Protective materials> In this embodiment, as shown in Fig. 2, the high-pressure water sprayed from the nozzles 14 of the descaling device bounces off the underside of the steel material 40 and heads toward the upstream portion of the side surface of the overhanging portion 19. Then, the high-pressure water from the nozzles 14 located at the ends of the nozzles 14 aligned in the plate width direction (see Fig. 6), i.e., the nozzles closer to the column portion 10A, may come into contact with the upstream portion of the side surface of the overhanging portion 19.

[0023] For this reason, in this embodiment, the upstream portion of the side surface of the protruding portion 19 is set as a contactable portion, which is a position where high-pressure water from the nozzle can come into contact with the protruding portion 19. The contactable portion is an area on the side surface of the protruding portion 19 that is upstream of the dashed line in Fig. 3(b) (to the right in Fig. 3(b)).

[0024] The block portion of the protrusion 19 including the contactable portion (the portion upstream of the dotted line in Figure 3(b)) is made into a mounting block 21 that is detachable from the main body of the column portion 10A. The mounting block 21 is attached to the main body of the column portion 10A by bolting. Note that it is not necessary for part of the protrusion 19 to be configured as a detachable mounting block 21. Figure 3(b) shows a case where part of the protrusion 19 is not configured as a detachable mounting block 21.

[0025] FIG. 4 shows the main body of the column portion 10A with the mounting block 21 removed. Here, the surface 20 on the pillar portion 10A side to which the mounting block 21 is attached is called the block mounting surface 20. The block mounting surface 20 has a recess 20A for positioning the mounting block 21 and a bolt hole 20B for fastening the mounting block 21 with a bolt.

[0026] The upper surface of the mounting block 21 forms part of the mounting seat 12 on which the chock 11B is mounted. The surface of the mounting block 21 facing the block mounting surface 20 is called the abutment surface 21A. The abutment surface 21A is the surface that abuts against the block mounting surface 20. The abutment surface 21A is formed with a protrusion 21a that is shaped to fit into the recess 20A.

[0027] The mounting block 21 has a through hole 21c that forms a bolt hole for a bolt that passes through the mounting block 21 at a position corresponding to the bolt hole 20B that opens in the block mounting surface 20 (see Figures 5 and 7).

[0028] Furthermore, the abutment surface 21A has seal grooves extending along its top and side portions, and seal materials such as O-rings are placed in the seal grooves, thereby providing seal portions 21e and 21f between the block mounting surface 20 and the abutment surface 21A. However, the lower portion of the abutment surface 21A does not have a seal portion.

[0029] Furthermore, a seal groove extends along the outer periphery of the bolt hole opening in the contact surface 21A. The seal groove is annular. A seal material such as an O-ring is placed in the seal groove to form a seal portion 21d. The seal portion 21d constitutes the seal between the block mounting surface 20 and the contact surface 21A.

[0030] As shown in FIG. 7 , the mounting block 21 is bolted and fixed to the main body of the rolling housing 10 by a bolt 30. Specifically, a shank 30B of the bolt 30 passes through a bolt hole 21c that penetrates the mounting block 21. A seal groove 30a extends along the outer periphery of the shank 30B on the bolt seating surface 30A that abuts against the block mounting surface 20. The seal groove 30a is annular. A seal material such as an O-ring is disposed in the seal groove 30a to form a seal between the bolt seating surface 30A and the abutment surface 21A. The bolt 30 has the seating surface 30A midway along the shank 30B, and a nut 32 is threadedly engaged with the end of the shank 30B opposite the tip that threads into the main body of the rolling housing 10.

[0031] Furthermore, holes for fixing a protective plate 24 are formed on the surface side of the mounting block 21 (see FIG. 7). The protective plate 24 constitutes a protective member as will be described later.

[0032] A protective member is provided on the surface of the mounting block 21 bolted to the rolling housing 10 to protect it from high-pressure water. The protective member of this embodiment is provided so as to cover the entire surface of the mounting block 21. In this way, the protective member is provided so as to cover the contactable portions. The protective member of this embodiment includes a padding portion 23 and a protective plate 24. The protective member may be composed of the padding portion 23 or the protective plate 24.

[0033] The padding 23 is made of steel material 40 that is padded to cover the surface of the mounting block 21. The space where the nut 32 that screws onto the end of the bolt 30 that opens into the surface of the mounting block 21 is located is closed by the padding 23, but this space may be filled with silicone to protect the end of the bolt 30 and the nut 32 from water.

[0034] The protective plate 24 is a steel plate having the same surface shape as the surface of the mounting block 21 when viewed from the front. As shown in Fig. 6, protective plate 24 is fixed to mounting block 21 by abutting against the surface of padding 23. In this example, as shown in Fig. 7, it is fixed by bolt 31. The tip of the bolt is located inside mounting block 21. In other words, protective plate 24 is attached to mounting block 21 via padding 23. Fig. 7 shows an example in which cylindrical protective portion 33 is provided to protect the outer periphery of the bolt head, but this protective portion 33 may be omitted.

[0035] 8, the surface of the protective plate 24 is provided with rectifying portions 25 that guide liquid downward. The rectifying portions 25 in this example protrude from the surface of the protective plate 24, and the protruding portions extend downward, making it possible to guide downward liquid that comes into contact with the surface of the protective plate 24. In this example, the rectifying portions 25 have a narrower width on the lower side of the two rectifying portions 25 that face each other in the plate width direction.

[0036] (Operation etc.) Since the rolling housing 10 is generally made of iron, splashed water coming into contact with the rolling housing 10 may erode the rolling housing 10.

[0037] Therefore, in this embodiment, a part of the protruding portion 19 of the rolling housing 10 that constitutes the mounting seat surface 12 of the chock 11B is configured to be protected from splashing water by a protective member. In this example, a part of the protruding portion 19 is used as a detachable mounting block 21, and the mounting block 21 is attached with bolts to the main body of the rolling housing 10. This makes it possible to replace parts that may come into contact with splashed water.

[0038] Furthermore, the surface of the mounting block 21 is protected by a build-up portion 23 formed by building up steel material (for example, SM490). Furthermore, by attaching a steel protective plate 24 to the surface of the mounting block 21, further protection from splashing water is achieved, thereby suppressing erosion of the surface of the rolling housing 10.

[0039] Here, a protective plate 24 attached to the mounting block 21 with a bolt 31 can protect the surface of the rolling housing 10 from high-pressure splashing water.

[0040] At this time, the high-pressure water may cause problems such as the bolts 31 falling off, which could result in the protective plate 24 falling off. In this embodiment, even if the protective plate 24 falls off, the mounting block 21 detachably attached to the rolling housing 10 can protect the surface of the main body of the rolling housing 10 (block mounting surface 20) from the high-pressure water. The mounting block 21 can then protect the surface of the rolling housing 10 until the protective plate 24 is restored during the next maintenance.

[0041] Furthermore, by providing the surface layer of the mounting block 21 with the build-up portion 23 made of SUS build-up, erosion of the mounting block 21 is suppressed when the protective plate 24 falls off. Furthermore, when the protective plate 24 is attached, contact between the iron mounting block 21 and the steel protective plate 24 can be avoided, preventing electrolytic corrosion.

[0042] In addition, the mounting block 21 also functions as the mounting seat 12 for the chock 11B of the feed roller 11, so that the progress of wear over time can be reduced and the rolling housing 10 can be restored to its original size without damaging the main body of the rolling housing 10. In addition, the protective plate 24 is provided with a flow straightening portion 25. This flow straightening portion 25 can change the main flow of the liquid that contacts it in any direction and drain it.

[0043] The mounting block 21 is mounted using bolts 30, but there is a risk that water may seep in through gaps in the bolt bearing surface 30A due to contact with high-pressure water. Water may accumulate on the shank 30B of the bolt 30, which may corrode the main body of the rolling housing 10. Therefore, in this example, a seal groove equipped with an O-ring or the like is attached to the bolt bearing surface 30A to prevent water from seeping in.

[0044] Additionally, a seal groove is provided between the mounting block 21 and the block mounting surface 20 of the rolling housing 10 to prevent water intrusion and corrosion, similar to the bolts 30. Here, the seal provided on the outer periphery of the block mounting surface 20 is configured so that it is not provided on the lower part of the block. This is in anticipation of a case where the seal on the upper part of the mounting block 21 is partially broken. This is also in anticipation of a case where water infiltrates between the block mounting surface 20 and the abutment surface 21A. In this embodiment, in this case, the sealability of the lower part makes it possible to prevent water from accumulating between the mounting block 21 and the abutment surface 21A of the rolling housing 10, which would cause corrosion of the rolling housing 10. As described above, in this embodiment, it is possible to prevent the rolling housing 10 from being eroded by the descaling water.

[0045] Here, the mounting block 21 is configured as only a part of the protruding portion 19, but the entire protruding portion 19 may also be used as the mounting block 21. However, when the mounting block 21 is configured as only a part of the protruding portion 19, the rigidity of the mounting seat 12 is higher.

[0046] Furthermore, this embodiment illustrates a case where a descaling device is provided inside the rolling housing 10 from the viewpoint of shortening the rolling line, but the present invention is not limited to this. The present invention is also applicable to a configuration where descaling is performed during transport using table rollers. In this case, it is sufficient to cover the areas of the pillars (body) that support the chocks of the table rollers that support the steel material 40 during descaling, which come into contact with high-pressure water, with the protective member of this example. Furthermore, at least a portion of the extension 19 does not have to be configured with the detachable mounting block 21 .

[0047] (others) The present disclosure may also have the following configuration. (1) Disclosure 1 is a descaling device that sprays high-pressure water from a nozzle onto the surface of a steel material supported by a conveying roller to remove scale formed on the surface of the steel material, A column portion is provided to support a chock (bearing housing) of the conveying roller, A protective member is provided to protect a contactable portion of the column portion, which is a position where the high-pressure water from the nozzle can come into contact with the contactable portion, from the high-pressure water. Descaling device. (2) Disclosure 2 discloses that the column portion includes a protruding portion having an installation seat on an upper surface thereof for installing the chock, and the contactable portion is provided on a side surface of the protruding portion, The protective member is provided so as to cover the contactable portion. (3) In Disclosure 3, the block portion of the protrusion, which includes at least the contactable portion, is an attachment block that can be attached to and detached from the column, and the attachment block is fixed to the surface of the column by bolting. (4) Disclosure 4 has a seal portion extending along the outer periphery of the shank of the bolt between the bearing surface that abuts against the surface of the column portion of the bolt for attaching the mounting block and the surface of the column portion, The mounting block has a seal portion extending along the top and sides between the surface of the post and the surface of the post, and no seal portion is provided below the abutting surface. (5) In Disclosure 5, the protective member includes a steel buildup portion that is built up on the surface of the contactable portion so as to cover the surface, and a protective plate that is fixed to the surface of the buildup portion. (6) Disclosure 6 provides a flow straightening portion on the surface of the protective plate for guiding downward the liquid that comes into contact with the surface. (7) In disclosure 7, the pillar portion is a pillar portion of a rolling housing, and the transport roller is a feed roller that feeds the steel material toward the rolling roll. [Explanation of symbols]

[0048] 10 Rolled housing 10A pillar part 11 Feed roller (transport roller) 11A Roll 11B Chock 12 Installation seat 13 Lower descaling header 14 nozzles 15 Upper descaling header 16 nozzles 19 Overhang 20 Block mounting surface 20A recess 20B bolt hole 21 Mounting block 21A Contact surface 21a Protrusion 21c Bolt hole (through hole) 21d Seal around the bolt 21e, 21f Outer periphery seal 23 Meat Section 24 Protective Plate 25 Rectifier 30 bolts (bolts for mounting the mounting block) 30A Bolt seat 30A Seat 30B Shaft 31 Bolts (Bolts for attaching the protection plate) 32 Nut 33 Protection Department 40 Slab (steel) R1 rough rolling mill WR Work Roll

Claims

1. A descaling device that sprays high-pressure water from a nozzle onto the surface of a steel material supported by a conveying roller to remove scale formed on the surface of the steel material, a column portion for supporting the chock of the conveying roller; A protective member is provided to protect a contactable portion of the column portion, which is a position where the high-pressure water from the nozzle can come into contact with the contactable portion, from the high-pressure water. Descaling device.

2. the column portion includes a protruding portion having an installation seat on an upper surface thereof for installing the chock, and the contactable portion is provided on a side surface of the protruding portion; The protective member is provided so as to cover the contactable portion.

2. A descaling device according to claim 1.

3. A block portion of the protruding portion including at least the contactable portion is an attachment block that is detachable from the column portion, and the attachment block is fixed to a surface of the column portion by bolt connection.

3. A descaling device according to claim 2.

4. a seal portion extending along the outer periphery of the shank of the bolt between the surface of the column portion and a seat surface of the bolt for attaching the mounting block that abuts against the surface of the column portion, a seal portion extending along the top and sides of the mounting block between a surface of the mounting block abutting against the surface of the post portion and the surface of the post portion, and no seal portion being present below the abutting surface; 4. A descaling device according to claim 3.

5. The protective member includes a steel padded portion that is padded on a surface of the contactable portion so as to cover the surface, and a protective plate that is fixed to a surface of the padded portion.

2. A descaling device according to claim 1.

6. a flow straightening portion provided on the surface of the protective plate for guiding liquid that comes into contact with the surface downward; 6. A descaling device according to claim 5.

7. The pillar portion is a pillar portion of a rolling housing, and the conveying roller is a feed roller that feeds the steel material toward the rolling roll. A descaling device according to any one of claims 1 to 6.

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