Technical field
[0001]
The present disclosure relates to scum removing apparatus and scum removal method for removing scum floating in the snout of a production facility dip plated steel sheet.
BACKGROUND
[0002]
In the production facility of hot dip galvanized steel sheets, the zinc evaporated from molten plating bath snout (reduction annealing furnace and the steel strip direct conduit connecting the molten zinc pot) condensing deposited at the inner wall, a powdery scum there is to be floating in the zinc plating bath Te.
[0003]
Therefore, the discharge port and the suction port is provided in the strip width direction on both sides of the steel strip in the snout, and a flow of the steel strip width direction, a technique of sucking the scum suction port is used, sufficient effects but did not make it into the get the, have been proposed following such technology.
[0004]
　For example, Japanese Patent Application Publication 2010-229530 Patent Publication (hereinafter referred to as Patent Document 1.), Respectively a pair of discharge ports and the suction port paired on opposite sides of the steel strip thickness direction, removing the suspended solids measures method is disclosed.
[0005]
　Further, Japanese Patent Application Publication 2000-064015 discloses (hereinafter, referred to as Patent Document 2.) And Japanese Patent Application Publication 2014-114484 discloses (hereinafter, referred to as Patent Document 3.), The one strip width direction a discharge port for discharging molten plating liquid on the side provided structure in which a suction port for sucking molten plating solution to the steel strip width direction other side is disclosed.
[0006]
　Further, Japanese Patent Application Publication 2003-293107 discloses (hereinafter, referred to as Patent Document 4.), The two discharge ports in the steel strip width direction on one side is provided, the one suction port in the steel strip width direction other side structure in which there is disclosed.
[0007]
　Further, Japanese Patent Application Publication 2014-201817 Patent Publication (hereinafter referred to as Patent Document 5.), In order to solve the challenges of providing an injection nozzle for injecting the molten plating solution, reciprocating plate member structure in which a dross mobile device for generating waves and are disclosed.
Summary of the Invention
Problems that the Invention is to Solve
[0008]
　However, in the method of Patent Document 1, a flow towards one flow toward the suction port provided in the steel strip width direction from the discharge port and the steel strip thickness direction provided the inlet occurs. Therefore, some of the scum will be flowing toward the steel strip surface, especially at both ends of the steel strip width direction, scum is likely to adhere to the steel strip surface of the discharge port is provided side.
　The discharge port to become close to the snout wall, the faster the flow of the wall surface, and peeling scum adhering to the wall surface, tends to adhere to the steel strip flows out to the bath surface. Particularly peeled scum from snout inner wall surface in contact with the plating bath has a large size, a problem.
[0009]
　Also it provides a Patent Document 2 and Patent Document 3, to form a flow having directivity to the other side from the one side in the width direction of the steel strip technology. However, the molten coating bath surface, accompanying flow occurs along with the steel strip is drawn into the molten zinc plating solution. Therefore, from one widthwise side of the steel strip just ejected the galvanizing solution toward the other side, the influence of the accompanying flow at the suction port side overcomes, scum will flow toward the steel strip surface .
[0010]
　In Patent Document 2, although configured to be installed parallel partition plate to the steel strip have been proposed, scum adhering to the partition plate surface is likely to fall off from the partition plate by the rectifying directions of the fast flow, the steel strip surface surface defects easily occur by adhering to.
[0011]
　Furthermore, also proposes technology for forcibly generating the bath surface flow away in a direction substantially perpendicular to the plane of the Patent Document 2 steel strip. However, since the strong currents flowing from both ends of the steel strip width direction to sheet width center direction occurs, a problem that has flowed scum tends to adhere to the both end portions of the steel strip width direction of the steel strip is produced.
[0012]
　Then, Patent Document 4, since the suction port is provided on the extension of the width direction, the flow directed from the two discharge ports to the suction port, more closer to the steel strip toward the discharge port to the suction port there is a possibility that the flow.
[0013]
　In Patent Document 5, for generating a wave plate member dross mobile device reciprocates, only scum floating in accordance with the generated waves is displaced vertically, flowing the scum aggressively Can not.
[0014]
　The present disclosure is to provide a scum removing apparatus and scum removal method which can suppress the adhesion of the steel strip scum floating on the molten coating bath surface at the strip full width.
Means for Solving the Problems
[0015]
　The inventors have conducted extensive observation results, we found that when the scum adhering to the snout wall in the plating bath near the surface becomes defective peeled adhered to the steel strip steel strip becomes a particular problem. In order to prevent these, it is difficult to peel off the scum adhering to the snout wall of boundary snout inner surface with the bath surface, and the bath as exfoliated scum does not stick flows on the steel strip surface even scum was peeled it has been found that it is sufficient to control the flow of the surface.
[0016]
　Scum removal apparatus according to one aspect of the present disclosure, the melting and snout which is inserted into the molten plating solution having a hot-dip plating bath surface in the inside of the plating pot, the steel strip width direction of the steel strip entering the position of the molten coating bath surface Meanwhile it disposed on an extension line of the side, and a discharge portion for discharging the molten plating solution, wherein disposed on the extension of the other side of the steel strip width direction of the molten coating bath surface, and a suction portion to suck the molten plating solution, wherein the suction portion includes a first suction portion made from the second suction unit, said second suction portion and the first suction unit, said molten coating bath surface of the steel strip width direction extension of the steel strip entering position across the line they are spaced apart from each other.
Effect of the invention
[0017]
　According to the scum removing apparatus according to the present disclosure, it is possible to suppress the adhesion to the steel strip scum floating on the molten coating bath surface.
BRIEF DESCRIPTION OF THE DRAWINGS
[0018]
FIG. 1 is a schematic sectional view from the side an example of a plating equipment of the steel strip.
It is a schematic cross-sectional view as viewed from line 2-2 direction of FIG. 2 snout internal to FIG.
It is a schematic cross-sectional view as viewed from line 3-3 direction of FIG. 3 FIG molten coating bath surface in the snout.
4 is a schematic perspective view of a discharge nozzle.
5 is a cross-sectional view taken along line 5-5 of FIG. 4 showing the discharge nozzle.
6 is a schematic enlarged cross-sectional view of a side one in FIG.
7 is a schematic enlarged cross-sectional view of a second side of FIG.
8 is a schematic perspective view of a suction nozzle.
9 is a schematic perspective view illustrating a suction nozzle of the first modification.
FIG. 10 is a schematic perspective view illustrating a suction nozzle of the second modification.
11 is a schematic sectional view of a second modified example of an enlarged other side of FIG.
It is a schematic cross-sectional view showing the flow of the molten plating solution [Figure 12] embodiment.
13 is a schematic sectional view showing the flow of the molten plating solution in the second modification.
14 is a schematic sectional view showing the flow of the molten plating solution in the third modification.
15 is a schematic perspective view illustrating a suction nozzle of the fourth modification.
It is a schematic cross-sectional view of a fourth modified example of an enlarged other side of FIG. 16 FIG.
17 is a diagram showing the flow of scum in the first comparative example in which the suction unit is provided on the other widthwise side discharge portion having no rectifying function in one widthwise side is provided of the steel strip.
18 is a diagram showing the flow of scum in the second comparative example using a discharge nozzle having a rectifying function.
19 is a diagram showing the flow of scum in embodiment with suction unit in two places.
FIG. 20 is a schematic cross-sectional view enlarging a part of FIG. 1 as viewed from the side of the molten coating bath surface in the snout.
Is a graph showing the flow velocity in the snout near the inner surface with respect to FIG. 21 spaced on one side by water model test distance SR1.
It is a diagram showing FIG. 22 the experimental results.
DESCRIPTION OF THE INVENTION
[0019]
　It will be described below with reference to the accompanying drawings of an embodiment.
　Figure 1 is a schematic arrangement of a plating facility 12 with one aspect of the scum removing apparatus 10, and a scum removal method according to the present embodiment is shown as an example. The plating equipment 12 is, for example, a thickness of performing 1 mm ~ 3 mm plated steel strip 14 facilities, plating facility 12 includes a reduction annealing furnace 16 of a continuous type annealing the steel strip 14, the reservoir is melted plating solution 18 and a hot dipping pot 20 that it is.
[0020]
　With zinc which is fused as a melt plating solution 18, but will be described as an example the case of galvanizing by immersing the steel strip 14, but is not limited thereto. For example, with the use of the molten tin, the steel strip 14 can be tin-plated, using the molten aluminum, the strip 14 can be aluminum plated.
[0021]
　From the reduction annealing furnace 16, and out the snout 22 is extended, the snout 22 includes an extended portion 22A extending laterally from the reduction annealing furnace 16, obliquely downward toward from the extended portion 22A to the hot dipping pot 20 and an inclined portion 22B extending to. Snout 22 is formed in a rectangular tubular shape surrounding the steel strip 14, the tip of the snout 22 is inserted into the molten plating solution 18 in the hot dipping pot 20.
[0022]
　Thus, the internal space of the snout 22 is isolated from the outside, snout 22 constitute a conduit for connecting to hold the airtightness of the reducing annealing furnace 16 and the molten plating pot 20.
[0023]
　The inner space of the snout 22, which is a reducing gas filling for suppressing oxidation of the steel strip 14, the strip 14 is immersed in the molten plating solution 18 in the hot dipping pot 20 without contact with air It is.
[0024]
　The base end side of the inclined portion 22B of the snout 22, the feed roll 26 to change the conveying direction 24 of the strip 14 obliquely downward. Reduction annealed in the annealing furnace 16 the strip 14 is conveyed in the longitudinal direction along the snout 22 is drawn into the molten coating bath surface 28 in the snout 22.
[0025]
　Strip 14 includes a guide roll 30 and feed roll 26 is arranged in the molten coating pot 20 are determined in the transport path in the snout within 22 by hot dipping bath surface 28 of the strip 14 is melt plating solution 18 stabilization of positions intruding is achieved in. Then, the steel strip 14, the transport direction 24 by the guide roll 30 is upwardly changed, fed from hot dipping pot 20 to the next step.
[0026]
　Figure 2 is a schematic sectional view showing a state viewed along the internal snout 22 line 2-2 in FIG. 1 schematically. On both sides of the steel strip width direction KH of the inclined portion 22B of the snout 22, viewing window 32 is provided. Strip width direction KH indicates the direction perpendicular to the conveying direction 24 of the strip 14.
[0027]
　The viewing window 32, a camera 34 is provided. The camera 34 photographs the state in which the strip 14 is drawn into the molten coating bath surface 28 in the strip entering position 29.
[0028]
　And the steel strip entering position 29, at the intersection and the steel strip 14 with the molten coating bath surface 28, or a cross is expected positions of the steel strip 14 with the molten coating bath surface 28, the steel strip in a plan view form a long straight line in the width direction KH.
[0029]
　Here, in the plating process, the inner surface of the snout 22, zinc evaporated from the molten plating solution 18 adheres to solidified. A portion of zinc deposited is the fall in vibration by the bath surface varies, the scum 36 floating the molten coating bath surface 28.
[0030]
　This scum 36 is a factor of surface defects adhering to the steel strip 14. Therefore, the snout 22, by providing the scum removing apparatus 10 for more detail below, to suppress the quality defects due to scum 36.
[0031]
(Scum removing apparatus)
　FIG 3 is a schematic sectional view showing a viewed molten coating bath surface 28 from above snout within 22 (snout 22 and has a strip 14 horizontally cut) state. 3, the strip 14 moves from the front of the sheet of FIG direction penetrating the back.
[0032]
　Further, reference numeral 60 denotes an extension line of the steel strip entering position 29, the extension 60, it refers to a virtual straight line A straight line passing through the thickness direction center of the steel strip 14 extending strip width direction KH. Extension 60, whereas in the position of the substantially equal distances from the inner wall surface 22D and the other inner wall 22E.
[0033]
　As shown in FIGS. 2 and 3, the one widthwise side H1 of the strip 14 (left side in the drawing), the discharge device 40 is provided on an extension line 60 of the steel strip 14.
[0034]

　The discharge device 40 comprises a cylindrical discharge pipe 42 which is bent in a U-shape. Discharge pipe 42 is provided with outer longitudinal tube portion 42A extending longitudinally disposed outside the snout 22, and a communicating portion 42B extending toward the lower end of the outer vertical pipe portion 42A to the snout 22 . Discharge pipe 42 is provided with an inner vertical tube portion 42C disposed inside the extending out snout 22 upward from the front end of the communicating portion 42B.
[0035]
　Proximal end of the outer vertical pipe portion 42A of discharge pipe 42 is extended upward from the molten coating bath surface 28, the proximal end of the outer vertical pipe portion 42A, the motor 46 is provided. The drive shaft of motor 46, screw 48 is provided with a screw 48 is rotated in the molten plating solution 18.
[0036]
　The height position of the outer vertical pipe portion 42A which corresponds to the screw 48, inlet 50 is formed in the snout 22 and opposite side. Thus, pumping from inlet 50 that opens to the outside of the snout 22 of the outer vertical tube portion 42A in the captured molten plating solution 18, a screw 48 to rotate to the communicating portion 42B and the inner vertical tube portion 42C.
[0037]
　The distal end of the inner vertical tube portion 42C, as shown in FIG. 4, the discharge nozzle 52 of rectangular shape for discharging a molten plating solution 18 in a molten coating bath surface 28 of the snout 22 is provided. Ejection nozzle 52 illustrating a direction of ejecting the molten plating solution 18 toward the steel strip 14 side as described later as before.
[0038]
Ejection nozzles 52]
　discharge nozzle 52 includes a bottom plate 52B having a circular hole 52A communicating with the inner vertical tube portion 42C, and a side wall 52C standing upright on both side edges of the bottom plate 52B. The discharge nozzle 52 is provided with a wall 52D was erected rear edge of the bottom plate 52B, a top plate 52E of continuously arranged at the upper edge of the side walls 52C and a rear wall 52D. From the front edge of the top plate 52E, and extends toward the extension plate 52F is the bottom plate 52B side, between the extension plate 52F and the bottom plate 52B, a discharge portion 56 which opens to the steel strip 14 side formed It is. Extension plate 52F, as shown in FIG. 5, suppressing the waving of the molten plating solution 18 discharged from the discharge unit 56.
[0039]
　The bottom plate 52B, as shown in FIG. 4, a pair of rectifying plates 58 are erected, the rectifying plate 58, as shown in FIG. 5, the long upper is supported extension plate 52F It is formed in a rectangular shape having a of. The discharge nozzle 52, the lower side is arranged so as to be positioned in the molten plating solution 18.
[0040]
　The flow of the molten plating solution 18 ejected from the ejection portion 56, as shown in FIGS. 3 and 6, directionality is rectified is improved by the rectifying plate 58 and the side wall 52C to the steel strip width direction KH. Further, the molten plating liquid 18 to be ejected, since it is rectified by the rectifier plate 58 and the side wall 52C, as compared with the case not be rectified, increased flow velocity in the strip 14 near (component of the steel strip width direction KH) is flowing the scum 36 quickly.
[0041]
　The discharge portion 56 is disposed on an extension line 60 of the steel strip 14 which extends in the steel strip width direction KH, substantially widthwise center of the discharge portion 56 is positioned above the extension line 60 of the steel strip 14. Accordingly, the discharge device 40, the molten plating bath to discharge the molten plating liquid 18 taken outside of the snout 22 from the one widthwise side H1 of the strip 14 by the discharge unit 56 to the steel strip 14 side through the inlet 50 forming a flow to the surface 28.
[0042]

　Further, as shown in FIG. 2, in the other widthwise side H2 of the steel strip 14 (the right side in the drawing) is a suction device 62 is provided. The suction device 62 includes a cylindrical inlet pipe 64 which is bent in a U-shape. Suction pipe 64 is provided with outer longitudinal tube portion 64A extending longitudinally disposed outside the snout 22, and a communicating portion 64B extending toward the lower end of the outer vertical pipe portion 64A to the snout 22 . Further, the suction pipe 64 has an inner vertical tube portion 64C disposed inside the extending out snout 22 upward from the front end of the communicating portion 64B.
[0043]
　Proximal end of the outer vertical pipe portion 64A of the suction pipe 64 is disposed so as to extend upward from the molten coating bath surface 28. The proximal end of the outer vertical pipe portion 64A, the discharge port 66 is opened in the snout 22 and opposite side to the high position in the molten plating solution 18.
[0044]
　The proximal end opening portion of the outer vertical pipe portion 64A, the gas supply pipe 68 is inserted for supplying nitrogen gas delivered from a supply source (not shown) (N2). The tip of the gas supply pipe 68 has reached the bottom of the outer vertical pipe portion 64A. Within the outer vertical pipe portion 64A, molten plating solution 18 with nitrogen gas supplied from the gas supply pipe 68 is pressure discharged is reduced from the outlet 66. Melting the plating solution 18 in the inner vertical tube portion 64C with a decrease of the internal pressure to flow into the outer longitudinal tube portion 64A via the communicating portion 64B.
[0045]
　Thus, the ends of the inner vertical tube portion 64C, as shown in FIGS. 3 and 7, constituting the first suction nozzles 71A and the second suction nozzle 71B. Opening of the first suction nozzles 71A and the second suction nozzle 71B is a first suction unit 72 and the second suction unit 74 constitutes a suction to suck molten plating solution 18 by the first suction unit 72 and the second suction unit 74 part 64H (see FIG. 3) is formed.
　Here, the suction unit (first suction unit 72 and the second suction unit 74) is provided in the nozzle (first suction nozzle 71A and the second suction nozzle 71B), an aperture portion to suck molten plating solution 18.
[0046]
　The first suction nozzles 71A and the second suction nozzle 71B, for example can be constituted by the suction pipe 64 of the pair of suction devices 62. Each suction pipe 64, as shown in FIG. 8, are provided apart strip thickness direction KT along the vertical direction (see FIG. 7). The upper end of the inner vertical tube portion 64C of one of the suction pipe 64 constitutes a first pipe 64F. The upper end portion of the inner vertical tube portion 64C of the other suction pipe 64 constituting the second pipe 64G.
[0047]
　First pipe 64F strip entering position 29 side at the tip (see FIG. 7) is cut obliquely, the opening surface so as to open toward the steel strip entering position 29 side in the molten coating bath surface 28 inclined doing. That is, the opening surface of the distal end portion of the first pipe 64F intersects inclined to the molten coating bath surface 28. Thus, the distal end portion of the first pipe 64F constitute a first suction nozzle 71A having a first suction unit 72 for sucking the molten plating solution 18.
[0048]
　Second pipe 64G strip entering position 29 side at the tip (see FIG. 7) have also been cut obliquely, the opening surface so as to open toward the steel strip entering position 29 side in the molten coating bath surface 28 inclined doing. That is, the opening surface of the distal end portion of the second pipe 64G intersect inclined to the molten coating bath surface 28. Thus, the distal end portion of the second pipe 64G constitutes a second suction nozzle 71B having a second suction unit 74 for sucking the molten plating solution 18.
[0049]
　Suction unit 64H is configured to be removed is sucked along with the first suction unit 72 and the second scum 36 floating the molten plating solution 18 by the suction unit 74 (see FIG. 3) to melt the plating solution 18.
[0050]
　As shown in FIG. 9, the first pipe 64F and the second pipe 64G, may be one in which the bifurcated from the main pipes 64I provided on the molten plating solution 18 (first modified example) . In this case, by forming the main pipe 64I at the end of the inner vertical tube portion 64C, it is possible to simplify the structure of the suction device 62.
[0051]
　Each suction nozzle 71A, configuration of 71B is not limited to this shape, as a second modification include those shown in FIG. 10 (only the first suction nozzle 71C) and 11. Note that FIG. 11, the same or equivalent parts as in FIG. 3 and 7, a description thereof will be omitted with denoted by the same reference numerals.
[0052]
　That is, the distal end of the inner vertical tube portion 64C, the first suction nozzle 71C is provided. Sidewall first suction nozzle 71C when the front opening direction of the first suction unit 72, standing upright with a bottom plate 70B having a circular hole 70A communicating with the inner vertical tube portion 64C, upward from both side edges of the bottom plate 70B and a 70C. The first suction nozzle 71C is standing edges rear edge of the bottom plate 70B is provided with a wall 70D after being provided continuously to the side wall 70C.
[0053]
　Sidewall 70C constitute a rectifying plate and the flow of the molten plating solution 18 to suck a function of rectifying the steel strip width direction KH. Also the second suction nozzle 71D is configured similarly to the first suction nozzle 71C.
[0054]
　The first suction nozzle 71C is because it has a side wall 70C, as shown in FIG. 11, regardless of the height of the molten coating bath surface 28, and the opening width SH1 (opening width SH2 of the second suction nozzle 71D) is constant Become.
[0055]
　Will now be described rectifying function of the rectifying plate sidewall 70C constitutes.
　As shown in FIG. 12, the suction nozzle 71A having no side walls, 71B may inhale molten plating solution 18 surrounding around each suction portion 72, 74. Therefore, the molten plating solution 18 in the snout 22, the inner wall surface 22D, may also flow occurs in the vicinity of 22E.
[0056]
　Therefore, the inner wall surface 22D, as the inner wall surface 22D by the flow of the molten plating solution 18 produced in 22E vicinity scum adhering to 22E without being stripped, the suction amount of the molten plating solution 18 in each suction portion 72, 74 require adjustment.
[0057]
　Therefore, as shown in FIG. 13, the suction nozzle 71C having a rectifying function by the side wall 70C, by using a 71D, it is possible to adjust the suction direction in the steel strip width direction KH.
[0058]
　At this time, as shown in FIG. 14, both the suction nozzle 71C, when the spaced the 71D, so that each suction unit 72 faces the steel strip 14 side, disposed both suction nozzles 71C, the 71D obliquely and, each of the inner wall surface 22D, inhibiting the flow of the molten plating solution 18 at 22E vicinity.
[0059]
　As shown in FIGS. 7 and 11, the first suction nozzle 71A, 71C and second suction nozzles 71B, 71D are both suction nozzles 71A, 71B, 71C, the extended line substantially center of the steel strip 14 between 71D 60 It is arranged so as to be located above.
[0060]
　Thus, the first suction nozzle 71A, the first suction unit 72 of the 71C is the extension line 60 of the strip 14 are arranged in one side in the thickness direction T1 of the strip 14 as a boundary, an extension of the strip 14 60 in more one side in the thickness direction T1 sucking molten plating solution 18 in the molten coating bath surface 28. The second suction nozzles 71B, the second suction unit 74 of the 71D is arranged in the thickness direction other side T2 that bordering the extension 60 of the strip 14, the thickness direction other than the extension line 60 of the strip 14 the side T2 sucks molten plating solution 18 in the molten coating bath surface 28.
[0061]
　In such a scum removing apparatus 10, the positional relationship between the snout 22 and the discharge unit 56 and the suction unit 72, 74, 6, it will be described with reference to FIG. 7, and FIG. 11.
[0062]
　Figure 6 is a diagram showing one widthwise side H1 of the snout 22. Discharge portion 56 to discharge nozzle 52 of the ejection device 40 is formed, the widthwise center is strip thickness direction KT are arranged so as to roughly coincide with the extension line 60 of the steel strip 14, the strip of the discharge portion 56 opening width TH of the thickness direction KT is a least 50mm. The arrangement of the opening width TH and the discharge portion 56, discharge regions TR of the discharge portion 56 is defined.
[0063]
　The discharge unit 56 is disposed from the inner surface of the snout 22 facing the steel strip 14 entering from the steel strip entering position 29 spaced above 100 mm. In other words, the distance SR1 of one to the inner wall surface 22D of the snout 22 from one end of the discharge portion 56 is the least 100mm. Further, the distance SR2 from the other end to the other inner wall surface 22E of the snout 22 discharge portion 56, which is the least 100mm, the distance SR1 and distance SR2, is set to approximately the same dimensions.
[0064]
　7 and FIG. 11 is a diagram showing the other side in the widthwise direction H2 of the snout 22. The first suction nozzle 71A of the suction device 62, 71C and the second suction nozzle 71B, the center of the strip thickness direction KT between 71D is arranged so as to roughly coincide with the extension line 60 of the steel strip 14.
[0065]
　The first suction nozzle 71A, 71C, the protruding amount from the molten coating bath surface 28 is adjusted. Accordingly, the first suction nozzle 71A, the opening width SH1 of the first suction unit 72 of 71C, in the height of the molten coating bath surface 28, there is a more than 40mm. The first suction nozzle 71A, the distance CR1 from extension 60 side edge of the steel strip 14 of 71C up to the extension line 60 is a 30mm or more. Incidentally, the first suction nozzle 71C is because it has a side wall 70C, as described above, regardless of the height of the molten coating bath surface 28, the opening width SH1 and distance CR1 is constant.
[0066]
　Second suction nozzles 71B, 71D, the protruding amount from the molten coating bath surface 28 is adjusted. Thus, the second suction nozzle 71B, the opening width SH2 of the second suction unit 74 of the 71D is a 40mm or more. The second suction nozzles 71B, distance CR2 from extension 60 side edge of the steel strip 14 of the 71D until extension 60 is a 30mm or more. Incidentally, the second suction nozzle 71D is because it has a side wall 70C, as described above, regardless of the height of the molten coating bath surface 28, the opening width SH2 and distance CR2 is constant. Each suction nozzles 71A ~ 71D of this embodiment, with respect to the extension line 60 is provided roughly in line symmetry.
[0067]
　Then, the center of the first suction unit 72 is located on one side in the thickness direction T1 from the end of one side in the thickness direction T1 of the discharge portion 56. The center of the second suction unit 74 is located on one side in the thickness direction T1 from the end of the thickness direction other side T2 of the discharge portion 56.
[0068]
　Furthermore, as the fourth modification include those shown in FIGS. 15 and 16.
　That is, the distal end of the inner vertical pipe 46C, the suction nozzle 70 is provided. Suction nozzle 70 when the front opening direction of the suction unit 72, 74, standing a bottom plate 70B having a circular hole 70A communicating with the inner vertical tube portion 64C, from the both side edges of the bottom plate 70B to the oblique direction top and a side wall 70C of the side is extended in the vertical direction. Further, the suction nozzle 70 is standing edges rear edge of the bottom plate 70B and the wall 70D after being provided continuously to the side wall 70C, the standing edge to the front edge of the bottom plate 70B is provided continuously to the side wall 70C before and a wall 70E, are formed in the opened box-shaped upward.
[0069]
　The upper edge of the front wall 70E, a rectangular cutout portion 70F is formed on both sides. The first suction unit 72 and the second suction unit 74 is an example of a first opening opened to the steel strip 14 side and the second opening is formed by the cutout portions 70F, site between both suction unit 72, 74 , there is a shield portion 76 is a front wall 70E top of the uncut part.
[0070]
　The lower edge of the suction portion 72, 74, the upper edge of the molten coating bath surface 28 is arranged so as to be positioned below the side walls 70C and on the rear wall 70D edge and the front wall 70E of the shield portion 76 the part, extending above the molten coating bath surface 28. Thus, the scum 36 floating medium melt plating solution 18 by the first suction unit 72 and the second suction unit 74 can be removed by sucking with molten plating solution 18, the shielding unit 76, the suction of the molten plating solution 18 to prevent.
[0071]
　The suction nozzle 70, as shown in FIG. 16, a substantially widthwise center is arranged to be positioned on an extension line 60 of the steel strip 14. The first suction portion 72 of the suction nozzle 70 as a boundary the extension 60 of the strip 14 are arranged in one side in the thickness direction T1 of the steel strip 14, with an extension 60 from the hand the thickness direction T1 of the strip 14 inhale molten plating solution 18 in the molten coating bath surface 28. The second suction unit 74 is disposed in the thickness direction other side T2 that bordering the extension 60 of the strip 14, molten coating bath surface 28 extended line 60 of the steel strip 14 in the thickness direction other side T2 inhale the molten plating solution 18.
[0072]
　The suction nozzle 70 has a width-direction center is strip thickness direction KT are arranged so as to roughly coincide with the extension line 60 of the steel strip 14, the suction nozzle 70 is part of an extension 60 of the strip 14 There has been closed by the blocking portion 76.
[0073]
　Opening width SH1 of the first suction unit 72 is a 40mm or more, the distance CR1 to the width direction center of the suction nozzle 70 from the widthwise center of the edge of the suction nozzle 70 is a 30mm or more. The opening width SH2 of the second suction unit 74 is a 40mm or more, the distance CR2 to the width direction center of the suction nozzle 70 from the widthwise center of the edge of the suction nozzle 70 is a 30mm or more there. Then, the suction nozzle 70 of the embodiment, there is a roughly axisymmetrical with respect to the width direction center, i.e. the extension line 60.
[0074]
　Then, the center of the first suction unit 72 is located on one side in the thickness direction T1 from the end of one side in the thickness direction T1 of the discharge portion 56. The center of the second suction unit 74 is positioned in the thickness direction other side T2 from the end of the thickness direction other side T2 of the discharge portion 56.
[0075]
　Scum removing apparatus 10 according to the present embodiment, and the effects of scum removal method will be described as compared to the prior art according to the above configuration.
　17, the one widthwise side H1 of the strip 14, no discharge portion 56 the rectifying function of the molten plating solution 18 is provided for discharging, the suction portion 84 is provided on the other widthwise side H2 of the strip 14 was the most basic configuration (Comparative example 1).
　18, instead of the discharge portion 56 of FIG. 17, a configuration using a discharge nozzle 52 having a rectifying function by rectifying plate 58 and the side wall 52C shown in FIG. 4 (Comparative Example 2).
　19, instead of the suction unit 84 of FIG. 18 is an example of the present embodiment with two suction portions 72, 74.
[0076]
　In these configurations, scum 36a adhering to the wall surface of the snout 22, 36b, the flow of when 36c is peeled off from the same position of the wall surface will be described.
　Incidentally, FIG. 20 is a diagram showing a state of a molten coating bath surface 28 of the snout 22, the molten coating bath surface 28 of the snout 22, melt plating solution 18 drawn with the steel strip 14 to be fed to the conveying direction 24 accompanying flow is generated by being.
[0077]
　In the basic configuration of FIG. 17 (Comparative Example 1), melt plating solution 18 by the wave of concentrically discharges radially from the discharge unit 56. Thus, the extent that the strip 14 is present, the average flow occurs over the snout 22 widthwise direction throughout a strip thickness direction KT. Therefore, the flow of the molten plating solution 18, also a relatively large flow rate in a wall surface of the snout 22. Therefore, scum 36a adhering to the wall surface of the snout 22 is easy to peel.
[0078]
　Further, the flow rate of the steel strip width direction KH of the strip 14 near is comparable with the wall surface near the snout 22. Therefore, the flow velocity of the steel strip width direction KH, the more flow scum 36a in a direction away from the end of the steel strip width direction KH is not large. Therefore, scum 36a by the accompanying flow of the molten plating liquid 18 with the strip 14 is drawn is being attracted to the steel strip 14, a defect adhering to the steel strip 14.
[0079]
　18, since the use of a discharge unit 56 having a rectifying function, to slow down the flow rate of the steel strip width direction KH in snout 22 with the vicinity of the wall surface of the snout 22, to suppress the falling of scum 36b from the wall surface. Further, the flow rate of the steel strip width direction KH increased in the steel strip 14 near flow scum 36b to the steel strip width direction KH against the accompanying flow. Therefore, compared basic configuration of FIG. 17 (Comparative Example 1), can be suppressed from adhering to the steel strip 14 of scum 36b.
[0080]
　However, even with this method, the steel strip 14 of the suction unit 84 side in some cases scum 36b is attached.
[0081]
　Therefore, to investigate the flow of observation of the molten coating bath surface 28, the position of the scum 36b adhered to the steel strip 14. Then, in a distance portion to the steel strip thickness direction KT of the steel strip 14, but flows almost strip width direction KH occurs, it is suction unit 84 side that flow occurs toward the steel strip 14 ends I understood.
[0082]
　Therefore, as shown in FIG. 19 was performed the first suction unit 72 and the second suction unit 74 is disposed apart in strip thickness direction KT experiment as an example of an embodiment. Then, the flow was toward the steel strip 14 end 18, can be diverted away from the strip 14 to the strip thickness direction KT, the scum 36c first suction unit 72 and the second suction portion I was able to inhale at 74.
[0083]
　It will now be described preferred arrangement and advantages of embodiments of the present invention.
　That is, scum removing apparatus 10 forms a flow by ejecting molten plating solution taken from the outside of the snout 22 from the discharge portion 56 to melt the plating solution 18 in the snout 22. Thus, it flows toward the scum 36 floats snout 22 to the first suction unit 72 and the second suction unit 74. In this case, the configuration in which the discharge region TR and the suction region are matched (e.g., the configuration of FIG. 17), the flow of the molten plating solution flowing from the one widthwise side H1 of the strip 14 to the other widthwise side H2 is drawn into the associated flow It would be.
[0084]
　In contrast, the flow from the discharge portion 56 first suction unit 72 or melt plating solution toward the second suction unit 74, the steel strip toward the one side in the width direction H1 of the strip 14 to the other widthwise side H2 away from the 14. Thus, the accompanying flow to suppress the movement of the steel strip 14 side of scum 36 drawn with molten plating solution 18 to the steel strip 14 side, the adhesion to the steel strip 14 of scum 36 floating the molten coating bath surface 28 it can be suppressed.
[0085]
　The center of the first suction unit 72 is located on one side in the thickness direction T1 from the end of one side in the thickness direction T1 of the discharge portion 56. The center of the second suction unit 74 is positioned in the thickness direction other side T2 from the end of the thickness direction other side T2 of the discharge portion 56.
[0086]
　Therefore, it the suction portions 72, 74 to flow as compared with the case provided in the discharge region TR, melt plating solution 18 discharged from the both sides in the width direction of the discharge portion 56 in a direction away from the strip 14 can. Thus, it is possible to suppress the adhesion to the steel strip 14 of the floating to scum 36.
[0087]
　Further, in the present embodiment, the first suction unit 72 and the second suction unit 74 is arranged at a distance from the extension line 60 of the strip 14 30 mm or more (CR1 ≧ 30mm, CR2 ≧ 30mm). Therefore, both the suction portion 72, 74 as compared with the case of provision of the extension 60 of the strip 14 to less than 30 mm, the flow in the width direction on both sides from the discharged molten plating solution 18 in the discharge portion 56 by the accompanying flow it is possible to suppress that the closer to the steel strip 14. Thus, it is possible to suppress the adhesion to the steel strip 14 of the floating to scum 36.
[0088]
　Also, the opening width of the first suction unit 72 and the second suction unit 74 SH1, SH2 is a 40mm or more. Accordingly, the opening width SH1, SH2, compared with the case of less than 40 mm, the suction region the spread of the molten plating solution 18 from the suction unit 72, 74, increases the efficiency of removal of floating to scum 36.
[0089]
　In particular, the suction nozzle 71C having a rectifying function, the use of 71D, it is possible to adjust the suction direction in the steel strip width direction KH. Thus, the inner wall surface 22D, while suppressing the separation of scum adhering to 22E, as compared with the case without a rectification function, can increase the suction amount of the molten plating solution 18 in each suction portion 72, 74.
[0090]
　At this time, as the suction portion 72, 74 facing the steel strip 14 side, by arranging the two suction nozzles 71C, the 71D obliquely, the inner wall surface 22D, inhibiting the flow of the molten plating solution 18 at 22E near can (see Figure 14).
[0091]
　The discharge unit 56 is spaced apart 100mm or more from the inner surface of the snout 22 facing the steel strip 14 entering from the steel strip entering position 29 (SR1 ≧ 100mm, SR2 ≧ 100mm). Therefore, it is possible spacing between the discharge portion 56 and the inner surface in comparison with the case of less than 100 mm, to suppress separation due to flow of the molten plating solution scum 36 adhered to the inner surface of the snout 22.
[0092]
　21, while the water model test for a change in the flow rate was measured in the snout 22 near the inner surface when the distance SR1 was varied up to the inner wall surface 22D (water bath snout 22 from the width direction one end of the discharge portion 56 which is the test) results.
[0093]
　The conditions of the water model test below.
　　Flow rate of the discharge portion 56 near the steel strip width direction KH: 250 mm / s
　　whereas the flow rate measurement position on the inner wall surface 22D near: the steel strip width direction KH center
[0094]
　As shown in FIG. 21, by setting the distance SR1 or more 100 mm, can verify that the decreased flow rate in the inner surface (on the other hand the inner wall surface 22D) near expected peeling prevention effect of scum 36 attached to the inner surface .
[0095]
　The opening width TH of the discharge portion 56 is a least 50mm. Accordingly, the opening width TH is compared with the case of less than 50 mm, to increase the discharge amount of the molten plating solution from the discharge portion 56, it is possible to enhance the effect of preventing adhesion scum 36 to the strip 14.
[0096]
　It is shown in Table experimental results in FIG. 22. This table, first passing mark 2 Comparative Example and the first and second experimental example is shown.
[0097]
　That is, Comparative Example No. 1 Comparative Example, which is provided discharge portions having no rectifying function in one widthwise side H1, and experiments provided a suction portion on an extension 60 of the steel strip 14 at the other widthwise side H2 is (arrangement of FIG 17). In this first comparative example, a large number of scum toward the suction side from the steel strip width direction KH central portion of the steel strip 14 is attached.
[0098]
　The second comparative example was a rectifying function provided in the discharge portion of the first comparative example (configuration of Figure 18). In this second comparative example, scum adheres mainly to the suction-part-side end portion of the steel strip 14.
[0099]
　The first embodiment, the provided discharging portion having no rectifying function in one widthwise side H1, the other widthwise side thickness direction hand that the border on the extension 60 of the strip 14 to the H2 side T1 and the thickness direction other side spaced suction unit paired in T2 is an example of an experiment are provided. In the first embodiment, the attachment of negligible scum steel strip 14 was observed, the coating weight can be greatly improved.
[0100]
　The second embodiment has a rectifying function provided in the discharge unit in the first embodiment (the configuration of FIG. 19). In this second embodiment, scum did not adhere to the steel strip 14.
[0101]
　It is a description of the code below.
10 scum removing apparatus
14 steel strip
18 melt plating solution
22 snout
22D whereas the inner wall surface
22E other inner wall
28 molten coating bath surface
36 scum
56 discharge portion
60 extension
72 first suction portion
74 the second suction unit
CR1 distance
CR2 distance
H1 one widthwise side
H2 other widthwise side
KH steel strip width direction
KT steel strip thickness direction
SH1 aperture width
SH2 opening width
SR1 distance
SR2 distance
T1 one side in the thickness direction
T2 thickness direction other side
TH opening width
TR ejection region
«note »
　from the specification, the following aspects are conceptualized.
　That is, scum removing apparatus according to the first embodiment includes a snout which is inserted into the molten plating solution of hot dipping pot having a melting plating bath surface to the inside, the steel strip width direction of the steel strip entering the position of the molten coating bath surface of located on one side of an extension, and a discharge portion for discharging the molten plating solution, wherein disposed on the extension of the other side of the steel strip width direction of the molten coating bath surface, and a suction portion to suck the molten plating solution , wherein the suction unit includes a first suction portion made from the second suction unit, said second suction portion and the first suction section, the steel strip width direction of the steel strip entering the position of the molten coating bath surface across the extension line they are spaced apart from each other.
　Scum removing apparatus according to the second aspect, in the first aspect, the discharge unit includes a rectifying plate for rectifying a flow of the discharged molten plating solution to the steel strip width direction.
　Scum removing apparatus according to the third aspect, in the first or second aspect, the second suction portion and the first suction unit includes a rectifier for rectifying the flow of the discharged molten plating solution to the steel strip width direction It provided with a plate.
　Scum removing apparatus according to a fourth aspect, in the first or second aspect, the first suction unit, so that the opening of the pipe tip sucking molten plating liquid is opened toward the steel strip entering position side opening surface is constituted by a first pipe which is inclined, the second suction portion, the opening portion of the pipe tip sucking molten plating liquid is opened surface inclined so as to open toward the steel strip entering position side It is constructed in two pipes.
　Scum removing apparatus according to a fifth aspect is the fourth aspect, the first pipe and the second pipe is formed bifurcated from the main pipe.
　Scum removal apparatus according to a sixth aspect, in the third embodiment from the first, the suction unit is constituted by a suction nozzle with a front wall facing the steel strip entering position side, said suction write nozzle the front wall, a shield portion that is disposed on the extension of the other side of the steel strip width direction to prevent the suction of the molten plating solution, provided on one side portion of the shield portion toward the steel strip entering position side a first opening which opens Te, provided on the other side of the shield portion toward the steel strip entering position side and a second opening that opens is formed, the first suction portion in the first opening together but are configured, the second suction unit is constituted by the second opening.
　Scum removing apparatus according to a seventh embodiment of the sixth aspect of the first, the discharge portion is spaced 100mm or more from the inner surface of the snout extending along the steel strip entering position.
　Scum removing method according to the eighth aspect, the hot dipping pot are inserted into the molten plating solution in within snout having a melt plating bath surface in the inside of the steel strip width direction of the steel strip entering the position of the molten coating bath surface Meanwhile ejecting molten plating solution from the extension line of the side, the other side of the steel strip width direction of the molten coating bath surface and across the strip width direction extension line of the steel strip entering the position of the molten coating bath surface in sucking molten plating liquid at a position spaced apart from each other.
　Further, from the specification, the following other aspects are conceptualized.
　The first alternative embodiment, "in the snout for coupling the reduction annealing furnace of the production facility of hot dip galvanized steel sheet and molten zinc pot, in order to remove the scum floating in a molten zinc bath, molten zinc a scum removal apparatus comprising a suction nozzle for sucking a scum with molten zinc in terms, the suction nozzle, a first suction nozzle disposed on one side of the steel strip passing through the snout, the steel scum removing apparatus comprising a second suction nozzle disposed on the other surface side of the band. "
　The second alternative embodiment, "the first and second suction nozzle is arranged in the snout in the end portion in the width direction of the steel strip passing through the snout, according to the first other embodiment scum removing apparatus. "
　the third another aspect," the first and / or second suction nozzle, with respect to the width direction extension line of the steel strip, at least 30mm in the thickness direction of the steel strip are spaced apart over, scum removing apparatus according to a second other embodiment. "
　the fourth other embodiment," the first and / or second suction nozzle, of the steel strip has at least 40mm above the opening diameter in the thickness direction, scum removing apparatus according to the second or third other embodiment. "
　Japanese Patent application No. 2015-251230, filed on 2015, December 24, disclosure, entirely incorporated herein by reference in .
　Further, all documents described herein, patent applications and technical standards, each individual publication, to the same extent as if the patent and technical standards are incorporated by reference marked specifically and individually, It incorporated by reference herein.

The scope of the claims
[Requested item 1]
A snout which is inserted into the molten plating solution of hot dipping pot having a melting plating bath surface to the inside,
is placed on the extension of one side of the steel strip width direction of the steel strip entering the position of the molten coating bath surface, the molten plating a discharge section for discharging a liquid,
　comprising the disposed on the extension of the other side of the steel strip width direction of the molten coating bath surface, and a suction portion to suck the molten plating solution, the,
　the suction unit includes a first suction unit When made from the second suction unit,
　said second suction portion and the first suction unit, said molten coating bath surface the steel strip entering the position of the steel strip width direction extension line sandwiched therebetween and spaced from each other in being arranged scum removal device.
[Requested item 2]
　The discharge section, scum removing apparatus according to claim 1, further comprising a rectifying plate for rectifying a flow of the discharged molten plating solution to the steel strip width direction.
[Requested item 3]
　Wherein the second suction portion and the first suction unit, scum removing apparatus according to claim 1 or claim 2 comprising a rectifying plate for rectifying a flow of the discharged molten plating solution to the steel strip width direction.
[Requested item 4]
　The first suction unit is constituted by a first pipe opening face is inclined such that the opening of the pipe tip sucking molten plating liquid is opened toward the steel strip entering position,
　the second suction unit, melt plating solution scum removal apparatus according to claim 1 or claim 2 is constituted by a second pipe opening surface is inclined such that the opening of the pipe tip is open toward the steel strip entering position side inhale .
[Requested item 5]
　It said first pipe and said second pipe is scum removal apparatus according to claim 4 which is formed bifurcated from the main pipe.
[Requested item 6]
　The suction unit is constituted by a suction nozzle with a front wall facing the steel strip entering position side,
　the said front wall of suction write nozzles are arranged on the extension of the other side of the steel strip width direction the a shielding portion that prevents the suction of the molten plating solution, a first opening that opens provided on one side portion of the shield portion toward the steel strip entering position side, provided on the other side of the shielding portion and the a second opening is formed which is open toward the steel strip entering position side,
　together with the first suction portion in the first opening is configured, the second suction unit in the second opening is configured scum removal apparatus according to any one of claims 1 to 3 that.
[Requested item 7]
　The discharge section, scum removal apparatus according to any one of claims 1 to 6 which is spaced 100mm or more from the inner surface of the snout extending along the steel strip entering position.
[Requested item 8]
　In is inserted into the molten plating solution of hot dipping pot snout having a melt plating bath surface in the inside,
　discharging the molten plating liquid from one side of the extension line of the steel strip width direction of the steel strip entering the position of the molten coating bath surface and,
　on the other side of the steel strip width direction of the molten coating bath surface, and sucking the molten plating solution at a location spaced apart from each other across the steel strip width direction extension line of the steel strip entering the position of the molten coating bath surface scum removal method.