CN103502499A

CN103502499A - Gas wiping device

Info

Publication number: CN103502499A
Application number: CN201280019830.8A
Authority: CN
Inventors: 若林久干; 胜部诚; 西川广
Original assignee: Nittetsu Plant Designing Corp; Nippon Steel Engineering Co Ltd
Current assignee: Nippon Steel Engineering Co Ltd; Nippon Steel Plant Designing Corp
Priority date: 2011-05-09
Filing date: 2012-05-07
Publication date: 2014-01-08
Anticipated expiration: 2032-05-07
Also published as: CN103502499B; EP2708616B1; JP6033558B2; EP2708616A4; KR20130128479A; WO2012153702A1; EP2708616A1; KR101416774B1; JP2012251237A

Abstract

This invention relates to a gas wiping device provided with a gas wiping nozzle which sprays a gas onto the surface of the steel strip to adjust the amount of a molten metal for plating which adheres to said surface, said gas wiping device having excellent overcoat and splash suppression at the ends of the steel strip in the width direction. This gas wiping device (10) is provided in a gas wiping nozzle (1) with a slit (1a') which extends in the width direction of a steel strip (K) and sprays a gas from a hollow space, and with gas inlets (1e) for introducing the gas into the hollow space; in the slit (1a') are provided left and right blocking members (2, 2) which freely slide and block the left and right regions of said slit, and a gas outlet port (1a) is formed between the left and right blocking members (2, 2); in the hollow space are provided left and right rectifier pieces (1c, 1c) which extend from the outlet port-side ends (2a, 2a) of the left and right blocking members (2, 2) to a partition wall (1d), forming a gas flow path (GR) between the left and right rectifier pieces (1c, 1c), wherein the width of the gas outlet port (1a) and the width of the gas flow path (GR) are the same.

Description

Gas wiping apparatus

Technical field

The present invention relates to a kind of gas wiping apparatus, it is to continuous conveying and impregnated in steel strip surface jet flow stream in plating bath is attached to the plating use on this surface adhesion amount of molten metal with adjusting.

Background technology

While carrying out the molten metal plating in the plating bath that makes the steel band continuous impregnating at molten metal, generally carry out not the solidifying the electroplating surface jet flow stream of steel band after dipping regulated the so-called airblast of the adhesion amount of molten metal, for example, the gas wiping apparatus that possesses the airblast nozzle in the steel band both sides configuration of carrying continuously, by carrying out airblast to this steel band both sides blow gas.

The airblast nozzle has and elongated shape corresponding towards the length of the width of the steel band of top conveying in the molten metal that is impregnated in plating tank, by its place ahead, is formed with the slot-shaped gas blow-out mouth of blow gas along this width (vertically).By from this gas blow-out mouth to steel band the end to end linearity ground jet flow stream from the width of steel band, remove on request the molten metal of steel strip surface to regulate its adhesion amount.

But, in above-mentioned airblast, the adhesion amount of the molten metal at the both ends of width of steel band direction cross to apply than other parts are more, or splashing of being dispersed at both ends by the molten metal of airblast becomes problem.These cross the problem that applies or splash becomes near the gas sprayed because of the airblast nozzle from subtend the both ends of steel band and collides each other the reason that produces sinuous flow etc.

For the above-mentioned mistake at the width both ends of reducing steel band applies or splashes, disclose a kind of gas wiping apparatus in patent documentation 1, it has: by the end positions in the gap of a pair of nozzle both sides' of subtend nozzle be set as the inaccessible mechanism in variable gap, the end positions in this gap is adjusted to the wavelength width of a slit regulating mechanism of end positions of steel band and the discharging jet of said nozzle of take rapid-result be the mechanism of certain mode adjusting gas flow.

According to this gas wiping apparatus, by will be across steel band and the end positions in a pair of nozzle both sides' of subtend gap is adjusted to the end positions of steel band, the state that formation can sharply not collided each other from the jet flow of the nozzle of subtend, eliminate the sinuous flow that jet flow collision each other causes, the adhesion amount of the molten metal of steel strip surface is distributed even as much as possible, crossing of the generation that can suppress to splash and both ends applies.

But, in patent documentation 1, disclosed gas wiping apparatus is that the blow-off outlet of inaccessible gas reduces the gas injection width, therefore, the gas circulated in the cavity of nozzle is at blow-off outlet contracted flow significantly, due to this contracted flow, periodically produce eddy current, this eddy current is upset gas flow, the mistake that produces by phased manner the width end of steel band applies or splashes, and can not apply or splash crossing to suppress fully.

With reference to the schematic diagram shown in Figure 11, this phenomenon is described.Figure 11 has carried out to disclosed gas wiping apparatus W in patent documentation 1 figure simplified, two inaccessible parts H, H in its place ahead, slide (Y1 direction) freely, according to their slip, regulate changeably the width of the gas blow-out mouth E of the central authorities that surrounded by inaccessible parts H, H.The gas (X3 direction) imported from the rear of gas wiping apparatus W forwards circulates via its cavity and from gas blow-out mouth E ejection (X4 direction), but the gas that flows through its cavity and arrive inaccessible parts H, H flows to center side contracted flow (X5 direction) sharp it, because this contracted flow sharply produces above-mentioned eddy current, this eddy current is upset gas flow, and the mistake that produces by phased manner the width end of steel band applies or splashes.

The prior art document

Patent documentation

Patent documentation 1:(Japan) JP 2007-284732 communique

Summary of the invention

Invent problem to be solved

The present invention develops in view of the above problems, it relates to the gas wiping apparatus of the airblast nozzle of the adhesion amount that possesses the molten metal of the steel strip surface jet flow stream being regulated to the plating use that is attached to this surface, the object of the invention is, provides a kind of mistake of width end of steel band to apply or the gas wiping apparatus of the inhibition excellence of splashing.

For solving the means of problem

In order to realize described purpose, the invention provides a kind of gas wiping apparatus, it possesses the airblast nozzle with cavity of adhesion amount of the molten metal of the plating use of the steel strip surface jet flow stream being regulated to this surface, wherein, described airblast nozzle comprises along the width of steel band and extends and arrange and from the gap of described cavity blow gas with possess the dividing plate (next door) that gas is imported to the gas introduction port of this cavity, be equipped with the inaccessible parts according to the zone of width of steel band obturation left and right and the left and right freely of sliding along this gap in described gap, and be formed with the gas blow-out mouth between the inaccessible parts of this left and right separated, be equipped with in described cavity from the inaccessible parts gas blow-out mouth side end separately of described left and right and extend the rectiblock of the left and right arranged to described dividing plate, be formed with gas flow path between the rectiblock of this left and right, the width of described gas blow-out mouth is identical with the width of described gas flow path.

Form the airblast nozzle of gas wiping apparatus of the present invention, in with the steel band subtend and along the width of this steel band, extending the elongated gap arranged, be equipped with the zone of inaccessible its left and right and the inaccessible parts of the left and right freely of sliding along this gap, be formed with the gas blow-out mouth between the inaccessible parts of the left and right in gap, the width of gas blow-out mouth reaches adjusting freely by the slip of the inaccessible parts of left and right.In addition, the sliding type of the inaccessible parts of this left and right has the mode of either party in the inaccessible parts of both sides synchronous and the mode of slip same amount or the left and right of only sliding etc., can pass through the slip of the inaccessible parts of left and right, the width adjusting of gas blow-out mouth is become to the degree identical with width of steel band.More specifically, such as the situation with the width that the width adjusting of the width of steel band of about 700～1800mm and gas blow-off outlet is become to identical situation or the width adjusting of gas blow-out mouth is become to expand respectively from the left and right of width of steel band the 10mm left and right etc.

And, in the cavity of airblast nozzle, be equipped with from the left and right end inaccessible parts to the left and right gas blow-out mouth side end separately of gas introduction port and extend the rectiblock of the left and right arranged, utilize the rectiblock of this left and right to mark off the gas flow path in cavity, thus, from the gas that gas introduction port imports, particularly at the left and right of the gas flow path end gas mobile along rectiblock, via the gas blow-out mouth side end of continuous rectiblock and inaccessible parts, from the gas blow-out mouth, spray swimmingly.

That is, can not produce following situation: flow through gas in the cavity of airblast nozzle at the gas blow-out mouth by (sharply) contracted flow significantly, periodically produce eddy current due to this contracted flow, this eddy current is upset gas flow.Thus, the mistake that can eliminate the width of steel band direction end that gas flow that the eddy current that is generated upsets causes fully applies or splashes.

Be explained, in this manual, so-called " left and right " refers to that the width of the steel band that will carry upward from plating tank is defined as left and right directions, and the width of this steel band of take is benchmark, the zone, left and right in the left and right of address steel band, gap, the left and right end of gas introduction port etc.

And, the width of the gas flow path marked off by the rectiblock of the left and right in the cavity of airblast nozzle and the width of gas blow-off outlet always keep identical, when the slip at the width of gas blow-out mouth by the inaccessible parts of left and right changes, the rectiblock of left and right is slided similarly thereupon, and the width of the width of gas flow path and gas blow-off outlet is changed with identical state.And, because the rectiblock of left and right is slided like this, the rectiblock of present embodiment presents the structure be separated with dividing plate.

In addition, the preferred implementation of gas wiping apparatus of the present invention is, in the described cavity of described airblast nozzle, upper face at described cavity is fixed with the tab that does not arrive lower face, lower face in the position of leaving this tab, be fixed with and do not arrive upper facial erected piece, the gas that imports gas flow path from gas introduction port is able to rectification the process that flows through tab and erected piece.

In gas flow path, by devices spaced apart, tab and erected piece are set, at the gas undulating plain, flow through in the process of these tabs and erected piece, gas is rectified, the pressure of gas or flow velocity on the width of gas flow path by homogenizing as much as possible.

In addition, embodiment as the Sliding Control of the inaccessible parts of relevant left and right, can enumerate following mode, , the inaccessible parts of described left and right utilize respectively as the left slide mechanism of intrinsic slide mechanism and right slide mechanism and reach slip freely, left slide mechanism and right slide mechanism are equipped on shared pedestal, this pedestal is connected with the pedestal slide mechanism and slides freely, be provided with the position transducer that detects the steel band position near described gas blow-out mouth, the inaccessible parts of left and right utilize described left slide mechanism and right slide mechanism to be slided with the width of adjustments of gas blow-off outlet, the position data of the steel band of pedestal slide mechanism based on being detected by described position transducer is slided pedestal, by pedestal the slide right slide mechanism that causes and the slip of left slide mechanism, make the inaccessible parts of left and right maintain the width of the gas blow-out mouth regulated constant and slided.

In the present embodiment, the Sliding Control of the inaccessible parts of left and right utilizes respectively left slide mechanism and right slide mechanism as intrinsic slide mechanism to carry out.At this, so-called " slide mechanism " is by the air cylinder device that inaccessible parts are slided or the formations such as electric sliding block assembly (Electricity Move スライダ device) of sliding on sliding substrate.In the situation that use air cylinder device, formation can be: inaccessible parts are arranged on to the piston nose of the slip of constituent apparatus, with the slip of piston, correspondingly make inaccessible parts horizontally slip freely.In addition, in the situation that use the electric sliding block assembly, formation can be: with line etc., electronic slide block is connected with inaccessible parts, electronic slide block horizontally slips on sliding substrate, correspondingly, inaccessible parts is horizontally slipped freely.

The data that for example are transfused to the relevant width of steel band of process control computer are sent to the slide mechanism of left and right, the width that the slide mechanism of left and right is slided and becomes to require with the width adjusting by the gas blow-out mouth based on these transmission data.

In addition, in molten metal the steel band transported from reductive annealed oven is impregnated in plating tank, via the synchronous roller in plating tank after vertical direction is carried, the gas that utilization blows out from the described gas wiping apparatus of the both sides, conveying road of the steel band that is equipped on this vertical direction, wiping is attached to the part of the molten metal of steel band two sides, to be adjusted to the adhesion amount of requirement.Although the data based on relevant width of steel band have become the width adjusting of gas blow-out mouth the width required,, steel band swans in this course of conveying, and its medullary ray usually departs from the medullary ray of the gas blow-out mouth that width adjusting finished.

So, in the present embodiment, left slide mechanism and right slide mechanism are equipped on shared pedestal, make this pedestal be connected and slide freely with the pedestal slide mechanism.In addition, the position transducer that detects the steel band position is set near the gas blow-out mouth, the position data of the steel band based on from this position transducer (position data of the position of center line data of steel band or the left and right end of steel band), the pedestal slide mechanism is slided pedestal on request, thus, do not change the relative position of the slide mechanism of the left and right of having stipulated gas blow-out mouth width, and they are slided in the mode corresponding with the steel band position.

In addition, this pedestal slide mechanism also can be the same with the slide mechanism of left and right, utilizes the formation such as air cylinder device or electric sliding block assembly.In addition, about " being provided with the position transducer that detects the steel band position near the gas blow-out mouth ", from can more critically carrying out the viewpoint to the gas blow-out of steel band, it is desirable to, position transducer is located near the near as far as possible position of middle distance gas blow-out mouth of gas blow-out mouth, here " near ", comprise the larger scope the top of the equipping position from the bath face in groove to gas wiping apparatus for example.

In addition, another embodiment as the Sliding Control of the inaccessible parts of relevant left and right, can enumerate following mode, , the inaccessible parts of described left and right utilize respectively as the left slide mechanism of intrinsic slide mechanism and right slide mechanism and reach slip freely, be provided with the position transducer that detects steel plate position near described gas blow-out mouth, the inaccessible parts of left and right utilize described left slide mechanism and right slide mechanism to slide the width of adjustments of gas blow-off outlet, the position data of the steel plate based on being detected by described position transducer, it is constant and slided that left slide mechanism and right slide mechanism make the inaccessible parts of left and right maintain the width of the gas blow-out mouth regulated.

In the present embodiment, utilize the width of left slide mechanism and right slide mechanism adjustments of gas blow-off outlet, identical with the embodiment of having narrated, but the slide mechanism of these left and right is not to be equipped on shared pedestal, and be based on from the location information data of the steel band of position transducer reception, the slide mechanism of left and right is synchronously to the equidirectional identical amount of sliding, and with the width that maintains the gas blow-out mouth regulated, constant and corresponding with the position of steel band mode is carried out Sliding Control to the inaccessible parts of left and right.

In addition, the mode that preferably with the gap from steel band left and right end inaccessible parts gas blow-out mouth side end separately to left and right, becomes identical length s is regulated, and is the scope of 0<=s<=10mm.

The inventor etc. confirm based on the result, in the situation that hold the gap s of the inaccessible parts in left and right gas blow-out mouth side end separately to become the scope of 0<=s<=10mm from the left and right of steel band, the generation of not splashing or splash seldom, and do not produce spray nozzle clogging.

The invention effect

From above explanation, be appreciated that, according to gas wiping apparatus of the present invention, gas blow-out mouth side end by the inaccessible parts in the left and right in the gap that is connected to form the gas blow-out mouth and mark off the so extremely simple improved structure of left and right rectiblock of gas flow path in the cavity of airblast nozzle, the gas that can not be created in circulation in the cavity of airblast nozzle at the gas blow-out mouth by contracted flow significantly, periodically produce eddy current due to this contracted flow, this eddy current is upset the consequence of gas flow and so on, and the mistake of the width of steel band direction end that the gas flow that can eliminate multilated fully causes applies or splashes.

Brief Description Of Drawings

Fig. 1 means the schematic diagram of the structure of molten metal electroplanting device;

Fig. 2 is the stereographic map of an embodiment of gas wiping apparatus;

Fig. 3 is that the III-III of Fig. 2 is to view;

Fig. 4 is that the IV-IV of Fig. 3 is to view;

Fig. 5 is the sectional elevation of another embodiment of gas wiping apparatus, is the figure corresponding with Fig. 3;

Fig. 6 is that the VI-VI of Fig. 5 is to view;

Fig. 7 is the schematic diagram of an embodiment of the slide mechanism of the inaccessible parts in left and right;

Fig. 8 is the schematic diagram of another embodiment of the slide mechanism of the inaccessible parts in left and right;

Fig. 9 (a) is the longitudinal section of analytic model, is (b) that the b-b of (a) is to view;

Figure 10 (a) means the figure of the analysis result of comparative example, (b) means the figure of the analysis result of embodiment;

Figure 11 illustrates that the inaccessible parts that gas is slided freely are the schematic diagram of contracted flow sharp in existing gas wiping apparatus.

The invention embodiment

Below, the embodiment with reference to accompanying drawing to gas wiping apparatus of the present invention describes.

(electroplanting device)

Mean the molten metal electroplanting device with schematic diagram in Fig. 1.About the electroplanting device meaned in this figure, in the plating tank Y formed holding the plating bath that consists of molten metal M such as fused zinc or molten aluminums and side lining cutting within it that not shown refractory brick etc. is arranged, rotation is equipped with synchronous roller R freely, the steel band K sent here from reductive annealed oven via not shown spout etc. is impregnated in molten metal M, and carries (X1 direction) via synchronous roller R to vertical direction.

Although the steel band K carried to vertical direction is attached with molten metal in its two sides, but above plating tank Y, both sides, conveying road at the steel band K carried to vertical direction are equipped with

gas wiping apparatus

10,10, the gas (air, nitrogen, rare gas element etc.) that utilization blows out from these

gas wiping apparatus

10,10, removing is attached to the part of molten metal of the two sides of steel band K, to be adjusted to the adhesion amount of requirement.

(embodiment 1 of gas wiping apparatus)

Fig. 2 be with stereographic map, mean the figure of an embodiment of gas wiping apparatus of the electroplanting device of pie graph 1, Fig. 3 be the III-III of Fig. 2 to view, Fig. 4 is that the IV-IV of Fig. 3 is to view.

The gas wiping apparatus 10 meaned in Fig. 2～Fig. 4, roughly by the airblast nozzle 1 with cavity, be located at its rear and form to the not shown gas supply device (gas supply source) of the gas inflow pipe 1b supply gas that gas is provided in the cavity to this airblast nozzle 1.

And, airblast nozzle 1 has along the width of steel band K and extends and arrange and from the gap 1a ' (its integral width is T) of its cavity blow gas, in the 1a ' of this gap, the

inaccessible parts

2,2 in (Y1 direction) left and right that are equipped with inaccessible its zone, left and right and slide freely along this gap 1a ', the gap area between the

inaccessible parts

2,2 in this left and right separated at these is formed with gas blow-out mouth 1a.

At the rear, inside of airblast nozzle 1, be communicated with gas inflow pipe 1b, in the place ahead of gas inflow pipe 1b, be provided with the dividing plate 1d that possesses a plurality of gas introduction port 1e.The gas provided by not shown gas supply device, via gas inflow pipe 1b(X2 direction) import in airblast nozzle 1, then import in cavity via gas introduction port 1e.

In addition, in the cavity of airblast nozzle 1, be equipped with

inaccessible parts

2,2 gas blow-out mouth side end 2a, the 2a separately from left and right and extend left and right rectiblock 1c, the 1c arranged to dividing plate 1d, with the space that upper face and lower face marked off of this left and

right rectiblock

1c, 1c and cavity, become gas flow path GR.

Gas wiping apparatus 10 with the width t of the width t of the gas flow path GR that forms between left and

right rectiblock

1c, 1c and gas blow-off outlet 1a always identical mode form.; with respect to the

inaccessible parts

2,2 in left and right, gas blow-out

mouth side end

2a, 2a's end that presents left and

right rectiblock

1c, 1c separately is fixed with the quadrature posture; and the structure that the other end of left and

right rectiblock

1c, 1c and dividing plate 1d break away from fully; thereby, can be with the width t of identical variable-width adjustments of gas blow-off outlet 1a and the width t of gas flow path GR.

Slip (Y1 direction) by the

inaccessible parts

2,2 in left and right, the width t of gas blow-out mouth 1a regulates freely, be adjusted to identical regulative mode or the width t of gas blow-out mouth 1a be adjusted to the regulative mode etc. of the width of expanding respectively the 10mm left and right from the width left and right of steel band K such as the width t of the width with the steel band K will changed between about 700～1800mm and gas blow-off outlet 1a, can with the change width of the steel band K width t of adjustments of gas blow-off outlet 1a on request correspondingly.

In addition, the sliding type of the

inaccessible parts

2,2 in left and right, have both sides synchronously only the slide mode of same amount or mode that only either party of the inaccessible parts in left and right is slided etc.

As shown in Figure 3, the gas (X3 direction) in a plurality of gas introduction port 1e import gas flow path GR, the gas mobile along

rectiblock

1c, 1c at the left and right of gas flow path GR end particularly, spray swimmingly (X4 direction) via the gas blow-out mouth side end 2a of continuous rectiblock 1c and inaccessible parts 2 from gas blow-out mouth 1a.

That is, can not produce following impact: the gas circulated in the cavity of airblast nozzle 1 is at gas blow-out mouth 1a by contracted flow sharp, and because this contracted flow periodically produces eddy current, and this eddy current is upset gas flow.Thus, the mistake that can eliminate the width of steel band direction end that gas flow that the eddy current that is generated upsets causes fully applies or splashes.

(embodiment 2 of gas wiping apparatus)

Fig. 5 is the sectional elevation of another embodiment of gas wiping apparatus, is the figure meaned with the form corresponding with Fig. 3, and Fig. 6 is that the VI-VI of Fig. 5 is to view.

Illustrated gas wiping apparatus 10A is in gas flow path GR, upper face at cavity is fixed with the tab 3a that does not arrive lower face, lower face at the cavity of the position of leaving this tab 3a is fixed with the erected piece 3b that does not arrive face, and the gas that imports gas flow path GR from gas introduction port 1e is able to rectification the process that flows through these tabs 3a and erected piece 3b (X3 ').

The more anterior position of the other end of left and

right rectiblock

1c, 1c in erected piece 3b or tab 3a, according to the width variation of gas blow-out mouth 1a, slided in the front of erected piece 3b and tab 3a.

By this rectification, the flow velocity of the gas imported from a plurality of gas introduction port 1e or pressure are by homogenizing as much as possible on the width of gas flow path GR, and the whole width that spreads all over steel band K provides flow velocity or the equal gas of pressure.

Utilize equally the gas wiping apparatus 10A of present embodiment, the gas in a plurality of gas introduction port 1e import gas flow path GR, the gas mobile along

rectiblock

1c, 1c at the left and right of gas flow path GR end particularly, gas blow-out mouth side end 2a via continuous rectiblock 1c and inaccessible parts 2 sprays swimmingly from gas blow-out mouth 1a, can not produce the impact of upsetting gas flow and so on because forming eddy current.

(embodiment 1 of the slide mechanism of the inaccessible parts in left and right)

Then, with reference to Fig. 7, take the embodiment 1 of gas wiping apparatus 10 as the slide mechanism of the inaccessible parts in example explanation left and right.

In illustrated slide mechanism, the

inaccessible parts

2,2 in left and right utilize respectively intrinsic left slide mechanism 5A and right slide mechanism 5B and horizontally slip freely, in addition, left slide mechanism 5A and right slide mechanism 5B are equipped on common-base 6, this common-base 6 is connected with pedestal slide mechanism 7, in order to slide freely.

The electronic slide block of left inaccessible parts 2 and the left slide mechanism 5A of formation, connect into roughly ring-type by two line W1, W1 via pulley 9, thus, when left slide mechanism 5A horizontally slips (Z1 direction), left inaccessible parts 2 also synchronously slide to the left and right freely (Z1 ' direction).Equally, the electronic slide block of right inaccessible parts 2 and the right slide mechanism 5B of formation, also by two line W2, W2, via pulley 9, connect into roughly ring-type, when right slide mechanism 5B horizontally slips (Z2 direction), right inaccessible parts 2 also synchronously slide to the left and right freely (Z2 ' direction).

In addition, carry the common-base 6 of left slide mechanism 5A and right slide mechanism 5B, utilize the electric cylinder that forms pedestal slide mechanism 7 and slide freely, under the state that the position of the horizontally slip 5A of mechanism, the 5B of the slip of the

inaccessible parts

2,2 in left and right that are positioned in the mode of the gas blow-out mouth 1a that can carry out being required with regulation width t fixes, pedestal 6 utilizes pedestal slide mechanism 7 to be slided, thus, carry out the centre line C L 2 make the steel band K that swans in carrying way and the consistent control of centre line C L 1 of gas blow-off outlet 1a.

Particularly, the data of the width of the relevant steel band K carried by process control computer PC are sent to slide mechanism 5A, the 5B of left and right, horizontally slipping, the 5A of mechanism, 5B are slided based on this transmitted signal so that the

inaccessible parts

2,2 in left and right slide, and form the gas blow-out mouth 1a that requires width t.

On the other hand, detected near being equipped on the left and right ends of 4,4 pairs of two groups of position transducers gas blow-out mouth 1a steel band K by carrying road near, these detection data are sent to pedestal slide mechanism 7.According to the detection data from left and right position transducer 4,4, the centre line C L 2 of calculating near the steel band K of the position of gas blow-out mouth 1a, in the inconsistent situation of centre line C L 1 of calculating centre line C L 2 and gas blow-out mouth 1a, pedestal slide mechanism 7 and pedestal 6 slips are this residual quantity (Z3 direction) only, slip by this pedestal 6, the horizontally slip 5A of mechanism, the 5B that are equipped on pedestal 6 carry out synchronous slide, correspondingly, the

inaccessible parts

2,2 in left and right carry out Sliding Control, so that gas blow-out mouth 1a and steel band K both sides' centre line C L 1, CL2 are consistent.

(embodiment 2 of the slide mechanism of the inaccessible parts in left and right)

Then, with reference to Fig. 8, take the embodiment 2 of gas wiping apparatus 10 as the slide mechanism of the inaccessible parts in example explanation left and right.

The difference of the slide mechanism shown in illustrated slide mechanism and Fig. 7 is that, in illustrated slide mechanism, the horizontally slip 5A of mechanism, 5B are not equipped on common-base; After illustrated the horizontally slip 5A of mechanism, 5B form the gas blow-out mouth 1a of the width t that requires, with swaning correspondingly of steel band K, both sides' only identical amount of synchronously sliding, thus, follow swaning of steel band K.Also have, although only the right-hand member ed of steel band K is detected with 1 position transducer 4A, this position transducer 4A utilizes position transducer slide mechanism 8 to slide freely.

To follow the mode swaned of steel band K, position transducer 4A is detected the right-hand member ed of steel band K on one side by 8 slips of position transducer slide mechanism on one side, these detection data are sent to the horizontally slip 5A of mechanism, 5B, the twocouese equidirectional identical amount of sliding, thus, the

inaccessible parts

2,2 in left and right, to the equidirectional identical amount of sliding, are positioned required position to be controlled to the right-hand member ed that makes steel band K with respect to gas blow-out mouth 1a.

[checking splash the sinuous flow of degree resolve and its result]

The analytic model that the inventor etc. simulate in construction drawing 9a, b in computer, and carry out the parsing of LES sinuous flow (LES: be not contrast resolution unit (resolve セ Le) large eddy current carries out modeling, but the non-constant sinuous flow analytic method directly calculated).As shown in Figure 9 b, the width t1 of steel band is made as 150mm, the insied width t2 of gas vent, the jet width t3 of gas also are made as 150mm, and the height t 4 of gas vent is made as 1.2mm, across steel band and the gas vent interval t5 of two gas wiping apparatus of subtend is made as 20mm.In addition, the air pressure in gas vent is made as 40kPa.

When carrying out modeling, as shown in Figure 9 b, will be apart from the scope modeling (total unit number of model is 2654640) at steel band center 1/2nd.In the analysis result figure formed, will carry out modeled analysis result diagram for Figure 10 a to the conventional example of Figure 11 on computer picture, will carry out to the embodiment suitable with the present invention modeled analysis result diagram for Figure 10 b.

Right-hand member zone at Figure 10 a, the flow direction of air tilts and flow (this confirmation is splashed larger) the oblique below of oblique upper and the right side to the right, in contrast, and in the right areas of Figure 10 b, the flow direction of the air ratio that the oblique below of oblique upper or the right side tilts to the right is considerably less, confirms that the generation of splashing is few.

[experiment and its result of steel band plate speed (transfer rate) scope during about electroplating processes]

The inventor etc. have carried out determining the experiment of the possible range of the relevant steel band plate speed while having applied respectively the existing gas wiping apparatus (comparative example) shown in the gas wiping apparatus (embodiment) shown in Fig. 3,4 and Figure 11.Particularly, the size that the thickness of steel band of take is 1200mm as 0.4mm, width, will hold the gap of gas blow-out mouth end to be set as 0mm from the left and right of steel band, verify that the adhesion amount made as electroplating with the zinc of molten metal becomes 120g/m on the steel band two sides ²the plate speed scope.Be explained, although with the gas wiping apparatus of the embodiment 2 shown in Fig. 5,6, carry out this experiment, but in the situation that the gas wiping apparatus of embodiment 2, can further expect to the gas wiping apparatus of embodiment 1 the gas rectification effect that tab and erected piece produce, therefore in this additional disclosure once, very clear and definite, than the experiment effect of the gas wiping apparatus shown in Fig. 3,4, more prove effective.

The following table 1 that the results are shown in by experiment.In table 1, the 0th, the generation of splashing is less and not to the result of again adhering to of steel band, △ be due to the generation of splashing exist to nozzle adhere to but not to the result of again adhering to of steel band, * be the generation of splashing many and exist to nozzle adhere to and to the result of again adhering to of steel band.

As shown in table 1, in the gas wiping apparatus of embodiment, in the situation that plate speed until the scope of the highest 240mpm lead to plate, confirming splashes does not again adhere on steel band.

On the other hand, in the gas wiping apparatus of comparative example, the plate speed scope that can expect effect same is for until the scope of the highest 180mpm.

Confirm according to this experimental result, compare with the situation of the existing gas wiping apparatus of application, can be made the fast operation more than 30% of plate speed.

[table 1]

[verifying experiment and its result of the optimum range in the gap of holding gas blow-out mouth end from the left and right of steel band]

The inventor etc. further make to hold from the left and right of steel band the gap of gas blow-out mouth end to carry out various variations, carry out about producing the size of splashing and the experiment of again adhering to that undirected steel band is arranged.Various conditions and experimental result have been shown in the table 1 of having narrated.

According to this experimental result, embodiment compares with comparative example, and the zone high in the former pressure of gas, that plate speed is fast all obtains good result.In addition, according to the experimental result of embodiment, confirm, from the left and right of steel band, hold the gap of gas blow-out mouth end to be preferably the scope of 0mm～10mm.

Above, use accompanying drawing to describe in detail embodiments of the present invention, but concrete structure is not limited to this embodiment, under the scope that does not break away from aim of the present invention, can carry out design alteration etc., these are also contained in the present invention.

Nomenclature

1: the airblast nozzle, 1a: gas blow-out mouth, 1a ': gap, 1b: gas inflow pipe, 1c: rectiblock, 1d: dividing plate, 1e: gas introduction port, 2: inaccessible parts, 2a: the gas blow-out mouth side end of inaccessible parts, 3a: tab, 3b: erected piece, 4, 4A: position transducer, 5A: left slide mechanism, 5B: right slide mechanism, 6: pedestal (common-base), 7: the pedestal slide mechanism, 8: the position transducer slide mechanism, 10, 10A: gas wiping apparatus, M: molten metal (plating bath), K: steel band, Y: plating tank, R: synchronous roller, W1, W2: line, PC: process control computer, CL1: the medullary ray of gas blow-out mouth, CL2: the medullary ray of steel band, ed: the right-hand member edge of steel band

Claims

1. a gas wiping apparatus, it possesses regulates the airblast nozzle with cavity of the plating on this surface with the adhesion amount of molten metal to the steel strip surface jet flow stream, wherein,

Described airblast nozzle comprises along the width of steel band and extends and arrange and from the gap of described cavity blow gas, and has the dividing plate that gas is imported to the gas introduction port of this cavity,

In described gap, be equipped with according to width of steel band and come the zone of inaccessible left and right and the inaccessible parts of left and right freely that slide along this gap, and be formed with the gas blow-out mouth between the inaccessible parts of this left and right separated,

In described cavity, be equipped with from the inaccessible parts gas blow-out mouth side end separately of described left and right and extend the rectiblock of the left and right arranged to described dividing plate, be formed with gas flow path between the rectiblock of this left and right,

The width of described gas blow-out mouth is identical with the width of described gas flow path.

2. gas wiping apparatus as claimed in claim 1, wherein, the inaccessible parts of described left and right and the rectiblock synchronous slide of described left and right, with the width of adjustments of gas blow-off outlet and the width of gas flow path.

3. gas wiping apparatus as claimed in claim 1 or 2, wherein, in the described cavity of described airblast nozzle, at the upper face of described cavity, be fixed with the tab that does not arrive lower face, lower face in the position of leaving this tab is fixed with the erected piece that does not arrive face

The gas that imports gas flow path from gas introduction port is able to rectification the process that flows through tab and erected piece.

4. gas wiping apparatus as described as any one in claim 1～3, wherein, the inaccessible parts of described left and right utilize respectively as the left slide mechanism of intrinsic slide mechanism and right slide mechanism and slide freely,

Left slide mechanism and right slide mechanism are equipped on shared pedestal, and this pedestal is connected with the pedestal slide mechanism, in order to slide freely,

Be provided with the position transducer that detects the steel band position near described gas blow-out mouth,

The inaccessible parts of left and right utilize described left slide mechanism and described right slide mechanism to be slided, and carry out the width of adjustments of gas blow-off outlet,

The position data of the steel band of pedestal slide mechanism based on being detected by described position transducer is slided pedestal, the right slide mechanism that slip by pedestal brings and the slip of left slide mechanism, make the inaccessible parts of left and right maintain the width of the gas blow-out mouth regulated constant and slided.

5. gas wiping apparatus as described as any one in claim 1～3, wherein, the inaccessible parts of described left and right utilize respectively as the left slide mechanism of intrinsic slide mechanism and right slide mechanism and slide freely,

The position data of the steel band based on being detected by described position transducer, it is constant and slided that left slide mechanism and right slide mechanism make the inaccessible parts of left and right maintain the width of the gas blow-out mouth regulated.

6. gas wiping apparatus as described as claim 4 or 5, wherein, hold the gap of the inaccessible parts gas blow-out mouth side end separately of left and right to be adjusted to as identical length s, and be the scope of 0<=s<=10mm from the left and right of steel band.