WO2012081716A1 - 鋼板のスケール除去用ノズルおよび鋼板のスケール除去装置並びに鋼板のスケール除去方法 - Google Patents
鋼板のスケール除去用ノズルおよび鋼板のスケール除去装置並びに鋼板のスケール除去方法 Download PDFInfo
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- WO2012081716A1 WO2012081716A1 PCT/JP2011/079271 JP2011079271W WO2012081716A1 WO 2012081716 A1 WO2012081716 A1 WO 2012081716A1 JP 2011079271 W JP2011079271 W JP 2011079271W WO 2012081716 A1 WO2012081716 A1 WO 2012081716A1
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- WIPO (PCT)
- Prior art keywords
- scale
- nozzle
- scale removal
- orifice
- steel plate
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/02—Cleaning by the force of jets or sprays
- B08B3/022—Cleaning travelling work
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
- B05B1/02—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
- B05B1/02—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape
- B05B1/04—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape in flat form, e.g. fan-like, sheet-like
- B05B1/042—Outlets having two planes of symmetry perpendicular to each other, one of them defining the plane of the jet
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
- B05B1/02—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape
- B05B1/08—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape of pulsating nature, e.g. delivering liquid in successive separate quantities ; Fluidic oscillators
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
- B05B15/14—Arrangements for preventing or controlling structural damage to spraying apparatus or its outlets, e.g. for breaking at desired places; Arrangements for handling or replacing damaged parts
- B05B15/18—Arrangements for preventing or controlling structural damage to spraying apparatus or its outlets, e.g. for breaking at desired places; Arrangements for handling or replacing damaged parts for improving resistance to wear, e.g. inserts or coatings; for indicating wear; for handling or replacing worn parts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
- B21B45/06—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing of strip material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
- B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
- B05B1/34—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49316—Impeller making
- Y10T29/4932—Turbomachine making
- Y10T29/49323—Assembling fluid flow directing devices, e.g., stators, diaphragms, nozzles
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49428—Gas and water specific plumbing component making
- Y10T29/49432—Nozzle making
Definitions
- the present invention relates to a scale removing nozzle, a steel plate scale removing device, and a steel plate scale removing method for removing scale on the surface of the steel plate.
- a steel material rolling line steel material is charged into a heating furnace in an oxidizing atmosphere and heated in a temperature range of 1100 to 1300 ° C. for several hours, followed by hot rolling.
- a primary scale generated during heating and a secondary scale generated after extraction from the heating furnace are generated.
- the scale bites into the surface of the steel plate as a product, and remains as scale wrinkles.
- This scale wrinkle significantly deteriorates the surface quality of the steel sheet and also has a significant effect on product quality because it becomes a starting point for cracks during bending.
- an antioxidant is applied to the surface of the steel material (see, for example, Patent Document 1), and (2) the heating temperature of the steel material is set below the melting point (about 1170 ° C.) of the firelight (for example, refer to Patent Document 2), (3) Perform rolling in a completely oxygen-free state (for example, refer to Patent Document 3), (4) Set the temperature before rolling and the temperature during rolling to a high temperature (about 1000 ° C. or higher). (5) A proposal has been made to completely remove the generated scale (see, for example, Patent Document 4).
- the means (1) not only increases the complicated application work, but also increases the manufacturing cost due to the cost of the treatment agent.
- (2) since the steel material is heated at a low temperature, the burden on the rolling mill increases, and there is a standard that cannot be applied from the viewpoint of securing material properties depending on the steel type. Further, (3) is not realistic because the equipment cost becomes enormous. Moreover, since (4) is extracted from the heating furnace at a high temperature, the fuel unit price increases, and the scale loss increases.
- a scale removal nozzle used in a scale removal apparatus that performs descaling normally injects high-pressure water onto the surface of a steel sheet, and peels and removes the scale of the steel sheet by the impact force of the injected water.
- JP-A-1-249214 Japanese Patent Publication No.58-1167 Japanese Patent Publication No. 60-15684 Japanese Patent No. 4084295 Japanese Patent No. 31299967
- Patent Document 4 the technique described in Patent Document 4 is to review the internal structure of the nozzle for scale removal, and the orifice (discharge hole) at the tip of the nozzle and the taper angle 30 ⁇ from this orifice.
- a nozzle having a taper portion extending at 80 ° and a large diameter portion connected to the taper portion, wherein the ratio of the inner diameter D1 of the large diameter portion to the short diameter D2 of the orifice (D1 / D2) is 3 or more. ing.
- Patent Document 4 is a technique that optimizes the internal structure of a conventional scale removal nozzle, there is a limit in greatly improving the descaling capability. Therefore, the present inventor has paid attention to such a problem, and has previously proposed to provide a steel plate scale removal nozzle, a steel plate scale removal device, and a steel plate scale removal method that can remove scale more efficiently. The investigation was repeated using a descaling ability evaluation model (see Patent Document 5).
- FIG. 1 is a diagram showing a collision model of water droplets on a steel plate in scale removal by jet water.
- the total impact force (F) and the unit impact force (S) can be expressed by the following equations.
- F total impact force of water sprayed on the steel sheet surface [N]
- S unit impact force of water sprayed on the steel sheet surface [Pa]
- P0 spray pressure [Pa]
- a orifice area [M 2 ]
- C sound velocity [m / s]
- d particle size [m] of water droplet
- ⁇ coefficient
- t time [s] for the shock wave to travel through the droplet.
- the inventors of the present invention have repeatedly studied based on the above descaling capability evaluation model, and have focused on the particle diameter d [m] of the droplet. And if the droplet can be refined, the total impact force (F) and unit impact force (S) increase, and the new finding that the descaling ability can be improved was obtained. Therefore, various nozzles were prototyped and further research was conducted.
- the steel plate scale removal nozzle according to one aspect of the present invention sprays water onto the surface of the steel plate, and removes the scale of the steel plate by the impact of the sprayed water.
- the discharge portion at the tip of the nozzle is a tapered portion provided continuously to the large diameter portion forming the cylindrical flow path, a first orifice formed on the outlet side of the tapered portion, and the first orifice
- a resonance chamber having a radial dimension larger than the major axis of the first orifice and a second orifice formed on the exit side of the resonance chamber is provided on the outlet side of the first orifice.
- the conventional scale removal nozzle discharges a continuous jet from an orifice to form a droplet flow.
- the vibration of a specific frequency depending on the capacity of the resonance chamber is amplified and the periodicity is increased.
- An intermittent (discontinuous) jet (or pulse jet) is formed. Accordingly, the droplet can be refined by promoting the transition to the droplet flow, and thereby the total impact force (F) and unit impact force generated when the droplet collides with the steel surface. (S) can be increased. As a result, the descaling capability was greatly improved compared to the conventional nozzle.
- the cross-sectional shape of the resonance chamber is rectangular. preferable. This is because in order to resonate and amplify, it is preferable to reflect the light vertically to the wall surface.
- the wall surface is a curved surface such as a circular cross section, the flow is diffused and is not easily amplified.
- the second orifice has an elliptical shape
- the resonance chamber has an axial height of 0 relative to the major axis of the second orifice. It is preferably formed in the range of 5 to 10 times.
- a steel plate scale removing apparatus includes a plurality of scale removing nozzles arranged above and below a steel plate that is a rolled material in a rolling process, and each scale removing device.
- a scale removing device that removes scale on the surface of a rolled material by spraying high-pressure water onto the surface of the rolled material from a nozzle for use in a steel sheet, wherein the scale removing nozzle is used as the scale removing nozzle.
- the scale removal nozzle according to any one of the above is mounted.
- each scale removing nozzle is based on the scale removing nozzle according to any one of the scale removing nozzles for the steel sheet according to one aspect of the present invention. Since the effect is exhibited, the scale can be efficiently removed by the above-described action mechanism.
- the scale removal method of the steel plate which concerns on 1 aspect of this invention WHEREIN:
- the high-pressure water is supplied from the scale removal nozzle to the scale of the surface of the steel plate which is a rolling material in a rolling process.
- removing the scale by using the scale removal nozzle according to any one of the scale removal nozzles of the steel sheet according to one aspect of the present invention as the scale removal nozzle.
- a plurality of nozzles are arranged above and below the rolled material in the rolling step, and high-pressure water is sprayed from the scale removing nozzles onto the surface of the rolled material to remove the scale on the surface of the rolled material.
- the scale removal nozzle to be used is the scale removal nozzle according to any one of the scale removal nozzles for a steel sheet according to the aspect of the present invention.
- the scale can be efficiently removed by the above-described action mechanism.
- the scale on the surface of the rolled material can be efficiently removed.
- FIG. 1 is an explanatory view showing a collision model of water droplets on a steel plate in scale removal by spray water.
- FIG. 2 is a schematic configuration diagram showing an example of a rolling line equipped with a steel plate scale removing device according to the present invention.
- FIG. 3 is a schematic perspective view showing an example of the scale removing nozzle of the present invention.
- FIG. 4 is a schematic cross-sectional view taken along line XX of FIG.
- FIG. 5 is a schematic front view of the nozzle discharge section of FIG.
- FIG. 6 is a diagram showing a discharge portion of a conventional scale removal nozzle used in the comparative example.
- the rolling process of the steel sheet includes a heating furnace 50 that heats the rolled material (steel sheet) K, and a heating furnace 50 exit side to remove scale from the rolled material K taken out from the heating furnace 50.
- HTB comprises a heating furnace outlet-side deskeler 60, followed by a rough rolling mill 70 that performs rough rolling, and a finish rolling mill 80 that subsequently performs finish rolling.
- the scale removing device of the present invention is arranged in each rolling process. That is, the heating furnace outlet-side descaler 60 is provided with adapters 61 for attaching the heating furnace outlet-side scale removing nozzles above and below the rolled material K. Similarly, a scale removal nozzle mounting adapter 62 is provided on the rough rolling entry side (RSB) of the rough rolling mill 70, and a scale removal nozzle attachment adapter 63 is provided on the finishing rolling entry side (FSB) of the finish rolling mill 80. Are arranged above and below the rolled material K, respectively. Each of the scale removal nozzle mounting adapters 61, 62, 63 is equipped with a scale removal nozzle 1 (hereinafter also simply referred to as “nozzle”).
- nozzle scale removal nozzle 1
- the scale removal nozzle 1 attached to the adapter 61, 62, 63 for attaching the scale removal nozzle is connected to the pump 30 and the accumulator 40 through a pipe, and sprays high-pressure water onto the surface of the rolled material K. Can do.
- this scale removal apparatus since this scale removal apparatus has the several pump 30 and the accumulator 40, it can always ensure the pressure and discharge amount of the high pressure water injected stably.
- FIG. 3 is a schematic perspective view of the nozzle 1
- FIG. 4 is a schematic cross-sectional view taken along line XX of FIG. 3
- FIG. 5 is a schematic front view of a discharge portion at the nozzle tip of FIG.
- the nozzle 1 is mainly composed of a casing 2, a nozzle case 11, and a nozzle tip 12.
- a flow path (or nozzle hole) is formed in the axial direction of the nozzle 1 by these members.
- the casing 2 has a substantially cylindrical shape and is provided with a flow path (or nozzle hole) inside so that water can flow into the flow path from one end on the upstream side of the nozzle 1.
- a nozzle case 11 is attached to the other end of the casing 2.
- the nozzle case 11 has a substantially cylindrical shape, and a nozzle tip 12 is mounted on the tip end side of the nozzle 1.
- the nozzle tip 12 is made of cemented carbide, and ejects a discharge flow therefrom.
- the casing 2 is composed of a first casing 2a that can be fixed to the nozzle case 11 with screws and a second casing 2b that can be fixed to the first casing 2a with screws. ing.
- a plurality of slits (or inlets) 3 extending in the axial direction are formed at predetermined intervals in the circumferential direction on the circumferential surface and end surface (flat surface) at the upstream end of the second casing 2b.
- the plurality of slits 3 serve as filters for allowing water to flow in while restricting the inflow of impurities.
- a rectifying unit (or rectifier or stabilizer) 4 is disposed in the flow path in the second casing 2b.
- the rectifying unit 4 is for guiding the water flowing in from the slit 3 to the nozzle hole, and includes a plurality of rectifying plates (rectifying blades) 5 extending in the radial direction from the core, and upstream and downstream of the core.
- the casing 2 that constitutes such a filter and includes the rectifying unit can also be referred to as a filter unit or a rectifying casing.
- the rectifying plate 5 of the rectifying unit 4 is in contact with the inner wall of the second casing 2b, and the rectifying unit 4 is restricted from moving downstream by fixing means (for example, locking, welding, fixing, etc.). ing.
- the flow path of the casing 2 extends from the upstream end (inlet) of the second casing 2b to the downstream end of the rectifying unit 4, and has substantially the same inner diameter (that is, the inner diameter of the upstream end of the casing 2b).
- a cylindrical flow path P1 having the same inner diameter, and an inclined flow path (annular inclination) that reaches a middle portion of the first casing 2a from the downstream end of the rectifying unit 4 toward the downstream direction and narrows in a tapered shape with a gentle inclination.
- the inclined wall (tapered portion) forming the inclined channel (annular inclined channel) P2 has a taper angle of about 5 to 10 °, for example.
- a cemented carbide nozzle tip 12 and a flow path having substantially the same inner diameter as the downstream end of the first casing 2a are formed from the tip of the nozzle 1 toward the upstream direction.
- Bushings (or annular side walls) 17 are sequentially attached.
- the nozzle tip 12 is regulated by the latching step portion 13 in the direction toward the tip.
- a nozzle tip 12 serving as a discharge portion at the tip thereof is continuously provided on a taper portion 16 provided continuously with a large diameter portion forming a cylindrical flow path, and on the outlet side of the taper portion 16.
- a resonance chamber 19 having a radial dimension larger than a major axis of the first orifice 20 is formed continuously on the outlet side of the first orifice 20. Since the resonance chamber 19 is structured to divide the nozzle tip 12 to create a space, the material of the resonance chamber 19 is made of the same cemented carbide as the nozzle tip 12.
- a cross-sectional shape may be circular, a rectangular shape is preferable. This is because, if the cross-sectional shape of the resonance chamber 19 is a rectangular shape, in order to amplify the resonance, it is preferable to reflect it perpendicularly to the wall surface.
- the tip surface of the nozzle tip 12 is formed with a curved groove 14 having a U-shaped cross section in the radial direction, and an elliptical discharge hole 15 is formed on the curved concave surface of the curved groove 14 as shown in FIG. Are provided continuously on the exit side of the resonance chamber. Note that the bottom surface of the curved groove 14 may be a curved bottom surface with both end portions raised as it extends in the extending direction (or radial direction) with the discharge hole 15 as the lowermost portion.
- the nozzle flow path (nozzle hole) extending in the axial direction of the nozzle 1 has an elliptical opening in the curved groove 14 (second orifice) 15 and a rectangular tube-like resonance formed in the nozzle tip 12.
- a resonance flow path P6 including a chamber 19 and a first orifice 20 formed on the entry side of the resonance chamber 19, and a taper portion extending linearly from the first orifice 20 toward the upstream side of the axis.
- the flow paths extending in a uniform inner diameter from the upstream end of the tapered portion 16 (in this example, the cylindrical flow paths P3 and P4 from the upstream end of the tapered section 16 to the downstream end of the gently inclined flow path P2) have a large diameter.
- Part 18 may be used.
- the elliptical first orifice 20 and the discharge hole 15 both have a major axis / minor axis ratio of about 1.5 to 1.8.
- the large diameter portion 18 (cylindrical flow path) with respect to the short diameter D2 of the first orifice 20 and the discharge hole 15
- the ratio (D1 / D2) of the inner diameter D1 of P3 and P4 or the downstream end of the inclined flow path P2 extending in the downstream direction from the rectifying unit is set to about 4.5 to 6.9.
- the angle (taper angle) ⁇ of the tapered portion 16 is set to about 45 to 55 ° in order to increase the impact force even when the jetted water has a low pressure and / or a low flow rate.
- a flange for attaching the nozzle 1 to a conduit (not shown) using an adapter (not shown) at an appropriate place of the nozzle case 11 and the casing 2 (in this example, the nozzle case 2).
- Etc. can be formed.
- the nozzle case 11 may be provided with a positioning convex portion 25 for the conduit in order to increase the positioning accuracy and inject the discharge flow in a flat or strip shape in a predetermined direction.
- the nozzle 1 is attached to the adapters 61, 62, and 64 for attaching the scale removing nozzle of the scale removing device.
- the discharge portion at the tip of the nozzle 1 includes a tapered portion 16 provided continuously to the large diameter portion 18 forming the cylindrical flow path, a first orifice 20 formed on the outlet side of the tapered portion 16, and a first orifice.
- the vibration of a specific frequency depending on the capacity of the resonance chamber 19 is amplified to form an intermittent (discontinuous) jet (or pulse jet) having periodicity. Accordingly, the droplet can be refined by promoting the transition to the droplet flow. Therefore, the total impact force (F) and unit impact force (F) generated when the droplet collides with the steel surface. It has become possible to increase S).
- the descaling capability was greatly improved compared to the conventional nozzle. Therefore, according to the scale removing device, the scale removing nozzle 1 attached thereto, and the steel plate scale removing method using the nozzle 1, both the descaling performance and efficiency can be greatly improved.
- the standard plate width is 1.2 m
- the standard plate thickness is 220 mm for the outlet side 220 mm of the heating furnace 50
- the rough rolling inlet side (RSB) 62 is 220 to 70 mm
- the finishing rolling inlet side (FSB) 63 is 60 to 40 mm was used.
- the results of comparison experiments with the conventional type are shown in Table 1 below.
- the height h of the resonance chamber 19 is set to the first and second orifices 15 and 19 according to the injection pressure P0 [Pa], the descaling flow rate [l / min], and the spray distance H [m]. Adjustment is made in the range of 0.5 to 10 times the major axis D3.
- the descaling capability is 1.3 to 1.5 times the improvement of the descaling capability in any process compared to the conventional one, the power consumption at the pump 30 is 70%, and Reduced flow rate by improving descaling capability is reduced by 30%, and the occurrence rate of quality defects due to descaling capability is less than 50% compared to the conventional one.
- this scale removal nozzle 1 the descaling performance It can be seen that the efficiency has been greatly improved.
- the height of the resonance chamber 19 depends on the injection pressure P0 [Pa], the descaling flow rate [l / min], and the spray distance H [m]. It was confirmed that a sufficient effect can be obtained by adjusting the length h in the range of 0.5 to 10 times the major axis D3 of the orifices 15 and 19.
- the steel plate scale removal nozzle, the steel plate scale removal device, and the steel plate scale removal method according to the present invention are not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention. Of course, it is possible.
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- Cleaning By Liquid Or Steam (AREA)
Abstract
Description
そこで、本発明者は、このような問題点に着目し、スケールを一層効率よく除去できる鋼板のスケール除去用ノズルおよび鋼板のスケール除去装置並びに鋼板のスケール除去方法を提供すべく、以前に提案したデスケーリング能力評価モデル(特許文献5参照)を用いて検討を重ねた。
F=P0×a×C×(3/d)×α×t
S=F/A
但し、F:鋼板表面での噴射された水の総衝撃力[N],S:鋼板表面での噴射された水の単位衝撃力[Pa],P0:噴射圧力[Pa],a:オリフィス面積[m2],C:音速[m/s],d:水滴の粒子径[m],α:係数,t:衝撃波が液滴中を伝わる時間[s]である。
また、本発明の一態様に係る鋼板のスケール除去用ノズルにおいて、前記第二オリフィスは、楕円状をなし、前記共振室は、その軸方向の高さが第二オリフィスの長径に対して、0.5~10倍の範囲に形成されていることは好ましい。
本発明の一態様に係る鋼板のスケール除去装置によれば、各スケール除去用ノズルが、上記本発明の一態様に係る鋼板のスケール除去用ノズルのうちいずれか一の態様のスケール除去用ノズルによる作用効果を奏するので、上述の作用機序により、スケールを効率よく除去することができる。
図2に示すように、鋼板の圧延工程は、圧延材(鋼板)Kを加熱する加熱炉50と、この加熱炉50から取り出された圧延材Kからスケールを除去するために加熱炉50出側(HSB)に設置された加熱炉出側デスケラ60と、それに続いて粗圧延を行なう粗圧延機70と、それに続いて仕上げ圧延を行なう仕上げ圧延機80とから構成されている。
図3~図5に示すように、ノズル1は、ケーシング2と、ノズルケース11と、ノズルチップ12とから主に構成されている。これらの部材によってノズル1の軸線方向に流路(又はノズル孔)が形成されている。
なお、この例では、ケーシング2は、ノズルケース11に対してねじによって固定可能な第1のケーシング2aと、第1のケーシング2aに対してねじによって固定可能な第2のケーシング2bとから構成されている。
ケーシング2の流路は、第2のケーシング2bの上流側端部(流入口)から整流ユニット4の下流端に至り、かつ実質的に同じ内径(つまり、ケーシング2bの上流側端部の内径と同じ内径)の円筒状流路P1と、前記整流ユニット4の下流端から下流方向に向かって第1のケーシング2aの途中部に至り、かつ緩やかな傾斜でテーパ状に狭まる傾斜流路(環状傾斜流路)P2と、この傾斜流路の下流端から下流方向に向かって延び、かつ実質的に同じ内径(つまり、傾斜流路P2の下流側端部の内径と同じ内径)の円筒状流路P3とを備えている。この例では、傾斜流路(環状傾斜流路)P2を形成する傾斜壁(テーパ部)のテーパ角は、例えば5~10°程度に形成されている。
ノズルチップ12の先端面は、断面U字状の湾曲溝14が半径方向に形成されるとともに、湾曲溝14の湾曲凹面に、図5に示すように、楕円形状の吐出孔15が第二オリフィスとして共振室の出側に連続して設けられている。なお、湾曲溝14の底面は、吐出孔15を最下部として延出方向(又は半径方向)に向かうにつれて両端部が隆起した湾曲状底面であってもよい。
スケール除去装置の、スケール除去用ノズルの装着用アダプター61、62、64には、ノズル1が装着されている。ノズル1の先端の吐出部は、円筒状流路を形成する径大部18に連続して設けられたテーパ部16と、テーパ部16出側に形成された第一オリフィス20と、第一オリフィス20の出側に連続して当該第一オリフィス20の長径よりも径方向寸法が大きく設けられた共振室19と、共振室19の出側に形成された吐出孔(第二オリフィス)15とを有する。したがって、吐出噴流周囲のせん断層で発生した振動のうち、共振室19の容量に依存した特定周波数の振動が増幅して周期性をもつ間欠(不連続)噴流(又はパルスジェット)を形成する。これにより、液滴流への移行を促進することで液滴を微細化することができ、したがって、同液滴が鋼材表面に衝突する際に発生する総衝撃力(F)および単位衝撃力(S)を増大させることが可能になった。この結果、従来ノズルに比べてデスケーリング能力が大幅に向上した。よって、このスケール除去装置およびこれに装着されたスケール除去用ノズル1、並びにノズル1を用いた鋼板のスケール除去方法によれば、デスケーリングの性能、効率ともに大幅に改善することができる。
なお、本発明に係る鋼板のスケール除去用ノズルおよび鋼板のスケール除去装置並びに鋼板のスケール除去方法は、上記実施形態に限定されるものではなく、本発明の趣旨を逸脱しなければ種々の変形が可能であることは勿論である。
2 ケーシング
4 整流ユニット
11 ノズルケース
12 ノズルチップ
14 湾曲溝
15 吐出孔(第二オリフィス)
16 テーパ部(又は円錐状傾斜壁)
17 ブシュ(又は環状側壁)
18 径大部
19 共振室
20 第一オリフィス
30 ポンプ
40 アキュムレータ
50 加熱炉
60 加熱路出側デスケラ
61、62、63 スケール除去用ノズルの装着用アダプター
70 粗圧延機
80 仕上げ圧延機
K 圧延材(鋼板)
P1 円筒状流路
P2 傾斜流路
P3 円筒状流路
P4 円筒状流路
P5 円錐状流路
P6 共振流路
Claims (5)
- 鋼板の表面に水を噴射し、その噴射された水の衝撃によって鋼板のスケールを除去するスケール除去用ノズルであって、
ノズル先端の吐出部は、円筒状流路を形成する径大部に連続して設けられたテーパ部と、該テーパ部出側に形成された第一オリフィスと、該第一オリフィス出側に連続して当該第一オリフィスの長径よりも径方向寸法が大きく設けられた共振室と、該共振室の出側に形成された第二オリフィスとを有することを特徴とする鋼板のスケール除去用ノズル。 - 前記共振室は、横断面が矩形であることを特徴とする請求項1に記載の鋼板のスケール除去用ノズル。
- 前記第二オリフィスは楕円状をなし、前記共振室は、その軸方向の高さが第二オリフィスの長径に対して、0.5~10倍の範囲に形成されていることを特徴とする請求項1または2に記載の鋼板のスケール除去用ノズル。
- 圧延工程における圧延材である鋼板の上下に配置される複数のスケール除去用ノズルを備え、各スケール除去用ノズルから高圧の水を圧延材表面に噴射して圧延材表面のスケールを除去するスケール除去装置であって、
前記スケール除去用ノズルとして、請求項1~3のいずれか一項に記載のスケール除去用ノズルが装着されていることを特徴とする鋼板のスケール除去装置。 - 圧延工程における圧延材である鋼板の表面のスケールを、スケール除去用ノズルから高圧の水を圧延材表面に噴射して除去する方法であって、
前記スケール除去用ノズルとして、請求項1~3のいずれか一項に記載のスケール除去用ノズルを用い、当該スケール除去用ノズルを圧延工程での圧延材の上下に複数配置し、各スケール除去用ノズルから高圧の水を圧延材表面に噴射して圧延材表面のスケールを除去することを特徴とする鋼板のスケール除去方法。
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US13/994,110 US9321084B2 (en) | 2010-12-14 | 2011-12-13 | Descaling nozzle for removing scale from steel sheet, descaling apparatus for removing scale from steel sheet, and descaling method for removing scale from steel sheet |
CN201180059767.6A CN103260779B (zh) | 2010-12-14 | 2011-12-13 | 钢板的氧化皮除去用喷嘴及钢板的氧化皮除去装置以及钢板的氧化皮除去方法 |
KR1020137014820A KR101506827B1 (ko) | 2010-12-14 | 2011-12-13 | 강판의 스케일 제거용 노즐과 강판의 스케일 제거 장치 및 강판의 스케일 제거 방법 |
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