WO2022241969A1 - 喷嘴结构及具有该喷嘴结构的锌铝镁专用分段式冷却器 - Google Patents

喷嘴结构及具有该喷嘴结构的锌铝镁专用分段式冷却器 Download PDF

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Publication number
WO2022241969A1
WO2022241969A1 PCT/CN2021/115043 CN2021115043W WO2022241969A1 WO 2022241969 A1 WO2022241969 A1 WO 2022241969A1 CN 2021115043 W CN2021115043 W CN 2021115043W WO 2022241969 A1 WO2022241969 A1 WO 2022241969A1
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Prior art keywords
cooler
zinc
strip
aluminum
magnesium
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PCT/CN2021/115043
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English (en)
French (fr)
Inventor
杨柏松
王之琳
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重庆赛迪热工环保工程技术有限公司
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Publication of WO2022241969A1 publication Critical patent/WO2022241969A1/zh

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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
    • B05B1/005—Nozzles or other outlets specially adapted for discharging one or more gases
    • 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
    • B05B1/044—Slits, i.e. narrow openings defined by two straight and parallel lips; Elongated outlets for producing very wide discharges, e.g. fluid curtains
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/06—Zinc or cadmium or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/26—After-treatment
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36—Elongated material
    • C23C2/40—Plates; Strips

Definitions

  • the invention belongs to the field of strip steel cooling, and relates to a nozzle structure and a zinc-aluminum-magnesium special-purpose sectional cooler with the nozzle structure.
  • the traditional single-stage cooler has been unable to meet the quality control requirements of galvanized spangles and zinc-aluminum-magnesium coatings on strip steel.
  • the core problem is that it is impossible to perfectly combine the nucleation and flowering of galvanized and zinc-aluminum-magnesium coatings; at the same time, it cannot solve the problem of the reaction between magnesium and silicon in the zinc-aluminum-magnesium coating. Therefore, the traditional single-stage cooler cannot meet the requirements of zinc, aluminum and magnesium production in terms of cooling intensity and control method, and it is urgent to develop a new type of cooler to meet the production requirements of zinc, aluminum and magnesium.
  • the traditional single-stage cooler usually uses high-speed injection to increase the cooling intensity, which is easy to damage the surface quality of the strip and affect the product quality.
  • one of the objectives of the present invention is to provide a nozzle structure to solve the problem of uniformity of air supply.
  • the second object of the present invention is to provide a zinc-aluminum-magnesium special-purpose sectional cooler with the nozzle structure, which can achieve the multi-effect integration of nucleation, flowering, oxidation prevention and harmful phase formation in the zinc, aluminum and magnesium coating process.
  • the present invention provides the following technical solutions:
  • a nozzle structure including nozzles and exhaust holes; there are more than one set of nozzles, symmetrically arranged on both sides of the strip along the direction of the strip, and nozzles are provided with spray slots pointing to the surface of the strip; the exhaust holes are set on each side of the strip In the interval area of adjacent groups of nozzles.
  • the spray slot matches the width of the steel strip, or reserves are left on both sides of the width of the steel strip.
  • the spray slot is directly facing the surface of the steel strip, so as to spray vertically to the surface of the steel strip.
  • the spray seam is in the shape of a duckbill closed in parallel.
  • a zinc-aluminum-magnesium-specific sectional cooler including multi-section coolers arranged in sections along the strip steel direction and independently controlled, and the nozzle structure as claimed in claims 1-3; each section of cooler includes symmetrically arranged The spray box on both sides of the steel, the nozzle structure is set on the spray box, and the spray slot of the nozzle sprays the cooling medium to the surface of the strip.
  • the multi-stage cooler specifically has two stages, and the two-stage coolers are arranged up and down, and the direction of the strip steel is vertical from bottom to top.
  • the cooling medium is cooling air.
  • the multi-stage cooler is installed on the mobile trolley, and travels through the mobile trolley.
  • a lifting device is installed on the mobile trolley, and the lifting device controls the segmental or overall lifting of the multi-section coolers.
  • subsections of the multi-section cooler are equipped with plate temperature gauges for detecting the surface temperature of the strip steel, and the temperature is controlled by adjusting the fan speed of the cooler.
  • auxiliary cooler arranged at the rear end of the cooling stroke of the multi-stage cooler along the strip steel direction, so as to meet the requirement of extra-thick strip steel flowering.
  • auxiliary cooler adopts air mist cooling.
  • the spray slit is arranged on the nozzle, and the spray density of a single nozzle is increased to increase the cooling intensity by utilizing the slender structure characteristics of the spray slit itself, so as to quickly nucleate instead of using high-speed spray Blowing is used to increase the cooling intensity, thereby preventing damage to the surface quality of the strip, and at the same time reducing the reaction equivalent of magnesium and silicon.
  • the nozzle structure disclosed in the present invention sends the return air through the exhaust hole, and cooperates with the nozzle of the present invention to ingeniously combine the return air, blowing density, and return air uniformity to solve the problem of air supply uniformity.
  • the cooler disclosed in the present invention adopts a segmented design and is independently controlled.
  • the coolers of each segment can match the requirements of the nucleation and flowering stages respectively, and the cooling rate can be flexibly adjusted to meet the cooling rate of the different cooling stages of the zinc-aluminum-magnesium coating. Requirements; It can also be applied to the process requirements of different strip thicknesses, expanding the scope of application.
  • the cooler disclosed in the present invention can be lifted up and down in sections or as a whole by the lifting device, so that it can be as close as possible to the zinc-aluminum-magnesium coating device, such as a zinc pot and an air knife, which is conducive to increasing the cooling intensity and rapid nucleation.
  • the zinc-aluminum-magnesium coating device such as a zinc pot and an air knife
  • the cooler disclosed in the present invention can effectively prevent the formation of harmful phases such as Mn 2 Zn 11 during the flowering stage, thereby ensuring product quality.
  • the cooler disclosed in the present invention can be moved by a mobile trolley. In the working state, each section of the cooler is translated to the corresponding position of the zinc-aluminum-magnesium coating device. When the zinc-aluminum-magnesium coating device needs to be overhauled, During maintenance, the cooler can be removed for easy operation.
  • the cooler disclosed in the present invention by adding an auxiliary cooler, can realize three-stage cooling for the flowering stage of the ultra-thick strip steel, which fully meets the production process requirements for the production of zinc, aluminum and magnesium for ultra-thick strips.
  • Fig. 1 is the structural representation of the sectional cooler special for zinc, aluminum and magnesium of the present invention
  • Fig. 2 is a structural schematic diagram of the nozzle structure of the present invention.
  • Figure 1 is a sectional cooler dedicated to zinc, aluminum and magnesium, including a first section cooler 2 arranged in sections along the direction of the strip steel 1 and independently controlled and a second section cooler 4 above it, It also includes the nozzle structure as shown in FIG. 2 .
  • the steel strip 1 runs vertically from bottom to top.
  • the first stage cooler 2 and the second stage cooler 4 are installed on the mobile trolley 7, the mobile trolley 7 walks along the rail beam 12 of the factory building, and provides support through the factory building column 8, and the first stage cooling is driven by the mobile trolley 7
  • the cooler 2 and the second stage cooler 4 are running.
  • a lifting device 6 is also installed on the mobile trolley 7, and the lifting device 6 controls the first section cooler 2 and the second section cooler 4 to lift in sections or as a whole. Lifting device 6 can utilize the existing structure that has lifting function to realize, as elevator etc.
  • Each section of cooler includes spray boxes 10 symmetrically arranged on both sides of the strip 1, and the nozzle structure is arranged on the spray box 10. Multiple groups of nozzles 9 are installed symmetrically, and the number of groups of nozzles 9 is flexibly selected.
  • the main part of the nozzle 9 is rectangular, and a duckbill-shaped spray seam 901 extending in parallel to the end of the strip steel 1 is formed.
  • the spray seam 901 is positive For the surface of strip steel 1, blow cooling air vertically to the surface of strip steel 1. A margin of 150mm is left on both sides of the strip width for the spray slot 901 to ensure sufficient spray density. Ventilation holes 11 are provided on the spray box 10 corresponding to the space between the upper and lower adjacent nozzles 9 on each side of the steel strip 1 .
  • the cooling air enters the nozzle 9 through the spray box 10, and hits the surface of the steel strip 1 through the parallel closed duckbill-shaped spray slot 901 to form a return air, returns parallelly along the outside of the nozzle 9, and is discharged through the exhaust hole 11 on the spray box 10 , ingeniously combine the return air, injection density, and return air uniformity to maintain the uniformity of air cooling to the greatest extent.
  • the nozzle structure increases the cooling intensity by increasing the injection density of a single nozzle 9 for rapid nucleation, instead of using high-speed injection to increase the cooling intensity, thereby preventing damage to the surface quality of the strip 1 and reducing magnesium and silicon reaction equivalent.
  • the subsection positions of the first stage cooler 2 and the second stage cooler 4 are provided with plate temperature gauges 3 for detecting the surface temperature of the steel strip 1, and temperature control is carried out through speed regulation of fans of the coolers.
  • an auxiliary cooler 5 is added for the state that the flowering stage of thick zinc, aluminum and magnesium cannot be completely realized.
  • the auxiliary cooler 5 is installed on the mobile trolley 7 and is arranged in the second section along the direction of the strip steel 1.
  • the cooler 4 is above and independently controlled, its number can be flexibly selected according to the actual plate thickness, and its cooling method can be selected as air mist cooling to increase the cooling speed.
  • the working principle of this cooler is: after the zinc-aluminum-magnesium coating device under the first cooler 2 coats the surface of strip steel 1 with zinc-aluminum-magnesium plating, the zinc-aluminum-magnesium plating solution on the surface of strip steel 1 running at high speed is completely in the Enter the first section cooler 2 in a liquid state, and complete the solidification and solidification process in the first section cooler 2; the sign of whether this stage is completed is to detect the surface temperature of the strip steel 1 according to the plate temperature meter 3, and control it by fan speed regulation The cooling rate of the first stage cooler 2;
  • the strip steel 1 continues to go up, and the process of surface blooming is completed after passing through the second stage cooler 4. If the cooling cannot complete the process due to the thickness of the plate, it continues to pass through the auxiliary cooler 5 to complete.
  • the first-stage cooler 2 can be lowered down as much as possible through the lifting device 6, and is as close as possible to the zinc-aluminum-magnesium coating device. In the flowering stage, it can effectively prevent the formation of harmful phases such as Mn 2 Zn 11 and ensure product quality.
  • the cooler When it is necessary to overhaul and maintain the zinc-aluminum-magnesium coating device, the cooler can be removed by the mobile trolley 7 for easy operation.
  • the cooler adopts a segmented design and is independently controlled.
  • the first cooler 2 and the second cooler 4 can respectively match the requirements of the nucleation and flowering stages, and flexibly adjust the cooling rate to meet the needs of different cooling stages of the zinc-aluminum-magnesium coating. Cooling rate requirements; it can also be applied to the process requirements of different strip thicknesses, expanding the scope of application.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Coating With Molten Metal (AREA)

Abstract

一种喷嘴结构及具有该喷嘴结构的锌铝镁专用分段式冷却器，喷嘴结构包括喷嘴(9)和排风孔(11)；喷嘴(9)有一组以上，沿带钢(1)走向对称布置在带钢(1)两侧，喷嘴(9)上设有指向带钢(1)表面的喷缝(901)；排风孔(11)开设在带钢(1)每侧的相邻组喷嘴(9)的间隔区域内。锌铝镁专用分段式冷却器包括沿带钢(1)走向分段布置且独立控制的多段冷却器和安装在其上的喷嘴结构。该喷嘴结构在保证带钢表面质量前提下加大喷吹密度，增加冷却强度；冷却器采用分段式设计且独立控制，适应带钢镀层不同冷却阶段要求及不同带钢板厚要求。

Description

喷嘴结构及具有该喷嘴结构的锌铝镁专用分段式冷却器 技术领域
本发明属于带钢冷却领域，涉及一种喷嘴结构及具有该喷嘴结构的锌铝镁专用分段式冷却器。
背景技术
传统的单段式冷却器已经无法满足带钢镀铝锌小锌花和锌铝镁镀层质量控制的要求。其核心问题是无法将镀铝锌和锌铝镁镀层的形核和出花完美结合；同时也无法解决锌铝镁镀层中镁与硅的反应问题。因此，传统的单段式冷却器，无论在冷却强度还是控制方式上都无法满足锌铝镁生产的要求，迫切需要开发一种新型冷却器来满足锌铝镁的生产要求。
传统的单段式冷却器通常采用高速喷吹的方式来增加冷却强度，容易对带钢表面质量造成破坏，影响产品质量。
发明内容
有鉴于此，本发明的目的之一在于提供一种喷嘴结构，解决送风均匀性问题。
本发明的目的之二在于提供一种具有该喷嘴结构的锌铝镁专用分段式冷却器，达到锌铝镁涂镀过程将形核、出花、防氧化、防止有害相生成多效合一的目的，解决传统单段式冷却器存在的不足。
为达到上述目的，本发明提供如下技术方案：
一种喷嘴结构，包括喷嘴和排风孔；喷嘴有一组以上，沿带钢走向对称布置在带钢两侧，喷嘴上设有指向带钢表面的喷缝；排风孔开设在带钢每侧的相邻组喷嘴的间隔区域内。
进一步，喷缝与带钢宽度相匹配，或者在带钢宽度两侧分别留有余量。
进一步，喷缝正对带钢表面，以垂直向带钢表面进行喷吹。
进一步，喷缝呈平行收口的鸭嘴状。
一种锌铝镁专用分段式冷却器，包括沿带钢走向分段布置且独立控制的多段冷却器，以及如权利要求1～3所述的喷嘴结构；每段冷却器包括对称布置在带钢两侧的喷箱，喷嘴结构设置在喷箱上，喷嘴的喷缝向带钢表面喷吹冷却介质。
进一步，多段冷却器具体有两段，两段冷却器上下布置，同时带钢走向为从下至上竖直走向。
进一步，冷却介质为冷却空气。
进一步，多段冷却器安装在移动台车上，通过移动台车走行。
进一步，移动台车上还安装有升降装置，通过升降装置控制多段冷却器分段或整体升降。
进一步，多段冷却器的分段位置设有用于检测带钢表面温度的板温计，通过冷却器的风机调速进行温度控制。
进一步，还包括沿带钢走向设于多段冷却器的冷却行程后端且独立控制的辅助冷却器，以适应超厚带钢出花要求。
进一步，辅助冷却器采用气雾冷却。
本发明的有益效果在于：
(1)本发明公开的喷嘴结构，喷嘴上设置喷缝，利用喷缝自身的细长结构特点，加大了单个喷嘴的喷吹密度来增加冷却强度，以便快速形核，而非采用高速喷吹的方式来增加冷却强度，从而防止破坏带钢表面质量，同时减少镁和硅的反应当量。
(2)本发明公开的喷嘴结构，通过排风孔将回风送出，配合本发明的喷嘴，将回风、喷吹密度、回风均匀性巧妙结合，解决了送风均匀性问题。
(3)本发明公开的冷却器，采用分段式设计且独立控制，各段冷却器可以分别匹配形核和出花阶段要求，灵活调整冷速，满足锌铝镁镀层不同冷却阶段的冷速要求；还能适用于不同带钢板厚的工艺要求，扩大了应用范围。
(4)本发明公开的冷却器，通过升降装置分段或整体升降，可以最大限度靠近锌铝镁涂镀装置，如锌锅和气刀，有利于增加冷却强度，快速形核。
(5)本发明公开的冷却器，在出花阶段能够有效防止形成Mn 2Zn 11等有害相，保障产品质量。
(6)本发明公开的冷却器，可以通过移动台车进行走行，在工作状态下，各段冷却器平移到锌铝镁涂镀装置对应位置，当需要对锌铝镁涂镀装置进行检修、维护时，则可以移开冷却器，方便操作。
(7)本发明公开的冷却器，通过增设辅助冷却器，针对超厚带钢出花阶段可以实现三段式冷却，完全满足超厚板生产锌铝镁的生产工艺要求。
本发明的其他优点、目标和特征在某种程度上将在随后的说明书中进行阐述，并且在某种程度上，基于对下文的考察研究对本领域技术人员而言将是显而易见的，或者可以从本发明的实践中得到教导。本发明的目标和其他优点可以通过下面的说明书来实现和获得。
附图说明
为了使本发明的目的、技术方案和优点更加清楚，下面将结合附图对本发明作优选的详 细描述，其中：
图1为本发明锌铝镁专用分段式冷却器的结构示意图；
图2为本发明喷嘴结构的结构示意图。
附图标记：带钢1、第一段冷却器2、板温计3、第二段冷却器4、辅助冷却器5、升降装置6、移动台车7、厂房立柱8、喷嘴9、喷缝901、喷箱10、排风孔11、厂房轨梁12。
具体实施方式
以下通过特定的具体实例说明本发明的实施方式，本领域技术人员可由本说明书所揭露的内容轻易地了解本发明的其他优点与功效。本发明还可以通过另外不同的具体实施方式加以实施或应用，本说明书中的各项细节也可以基于不同观点与应用，在没有背离本发明的精神下进行各种修饰或改变。需要说明的是，以下实施例中所提供的图示仅以示意方式说明本发明的基本构想，在不冲突的情况下，以下实施例及实施例中的特征可以相互组合。
其中，附图仅用于示例性说明，表示的仅是示意图，而非实物图，不能理解为对本发明的限制；为了更好地说明本发明的实施例，附图某些部件会有省略、放大或缩小，并不代表实际产品的尺寸；对本领域技术人员来说，附图中某些公知结构及其说明可能省略是可以理解的。
本发明实施例的附图中相同或相似的标号对应相同或相似的部件；在本发明的描述中，需要理解的是，若有术语“上”、“下”、“左”、“右”、“前”、“后”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此附图中描述位置关系的用语仅用于示例性说明，不能理解为对本发明的限制，对于本领域的普通技术人员而言，可以根据具体情况理解上述术语的具体含义。
请参阅图1，为一种锌铝镁专用分段式冷却器，包括依次沿带钢1走向分段布置且独立控制的第一段冷却器2和位于其上方的第二段冷却器4，还包括如图2所示的喷嘴结构。本实施例中，带钢1走向为从下至上竖直走向。
第一段冷却器2和第二段冷却器4安装在移动台车7上，移动台车7沿厂房轨梁12走行，并通过厂房立柱8提供支撑，通过移动台车7带动第一段冷却器2和第二段冷却器4走行。移动台车7上还安装有升降装置6，升降装置6控制第一段冷却器2和第二段冷却器4分段或整体升降。升降装置6可以利用具有升降功能的现有结构来实现，如升降机等。
每段冷却器包括对称布置在带钢1两侧的喷箱10，喷嘴结构设置在喷箱10上，具体来说，带钢1两侧的每段冷却器的喷箱10上沿带钢1走向对称安装多组喷嘴9，喷嘴9的组数 灵活选定，喷嘴9的主体部分呈矩形，朝向带钢1的一端延伸出呈平行收口的鸭嘴状的喷缝901，该喷缝901正对带钢1表面，以垂直向带钢1表面喷吹冷却空气。喷缝901在带钢宽度两侧分别留有150mm的余量，保证足够的喷吹密度。带钢1每侧的上下相邻喷嘴9的间隔区域对应的喷箱10上设有排风孔11。冷却空气经过喷箱10进入喷嘴9，经平行收口的鸭嘴状的喷缝901冲击到带钢1表面形成回风，顺着喷嘴9外侧平行返回，经过喷箱10上的排风孔11排出，将回风、喷吹密度、回风均匀性巧妙结合，最大限度保持风冷的均匀性。该喷嘴结构通过加大单个喷嘴9的喷吹密度来增加冷却强度，以便快速形核，而非采用高速喷吹的方式来增加冷却强度，从而防止破坏带钢1表面质量，同时减少镁和硅的反应当量。
第一段冷却器2和第二段冷却器4的分段位置设有用于检测带钢1表面温度的板温计3，通过冷却器的风机调速进行温度控制。
作为本实施例的改进，针对厚板锌铝镁出花阶段无法完整实现的状态而增设辅助冷却器5，辅助冷却器5安装在移动台车7上，沿带钢1走向设于第二段冷却器4上方且独立控制，其数量可以根据实际板厚需要灵活选择，其冷却方式可以选择气雾冷却，以提高冷却速度。
该冷却器的工作原理是：第一段冷却器2下方的锌铝镁涂镀装置对带钢1表面涂镀锌铝镁后，高速运行的带钢1在其表面锌铝镁镀液完全处于液态的状态下进入第一段冷却器2，在第一段冷却器2内完成凝固固化过程；该阶段是否完成的标志是根据板温计3检测带钢1表面温度，通过风机调速来控制第一段冷却器2的冷却速度；
带钢1继续上行，经第二段冷却器4后完成表面出花的过程，如冷却因板厚无法完成该过程，则继续向上经过辅助冷却器5来完成。
为了快速形核，可以通过升降装置6将第一段冷却器2尽可能地向下降低，最大限度靠近锌铝镁涂镀装置。在出花阶段，能够有效防止形成Mn 2Zn 11等有害相，保障产品质量。
当需要对锌铝镁涂镀装置进行检修、维护时，可以通过移动台车7移开冷却器，方便操作。
该冷却器采用分段式设计且独立控制，第一段冷却器2和第二段冷却器4可以分别匹配形核和出花阶段要求，灵活调整冷速，满足锌铝镁镀层不同冷却阶段的冷速要求；还能适用于不同带钢1板厚的工艺要求，扩大了应用范围。
最后说明的是，以上实施例仅用以说明本发明的技术方案而非限制，尽管参照较佳实施例对本发明进行了详细说明，本领域的普通技术人员应当理解，可以对本发明的技术方案进行修改或者等同替换，而不脱离本技术方案的宗旨和范围，其均应涵盖在本发明的权利要求范围当中。

Claims (12)

  1. 一种喷嘴结构，其特征在于：包括喷嘴和排风孔；喷嘴有一组以上，沿带钢走向对称布置在带钢两侧，喷嘴上设有指向带钢表面的喷缝；排风孔开设在带钢每侧的相邻组喷嘴的间隔区域内。
  2. 根据权利要求1所述的喷嘴结构，其特征在于：所述喷缝与带钢宽度相匹配，或者在带钢宽度两侧分别留有余量。
  3. 根据权利要求1所述的喷嘴结构，其特征在于：所述喷缝正对带钢表面，以垂直向带钢表面进行喷吹。
  4. 根据权利要求1所述的喷嘴结构，其特征在于：所述喷缝呈平行收口的鸭嘴状。
  5. 一种锌铝镁专用分段式冷却器，其特征在于：包括沿带钢走向分段布置且独立控制的多段冷却器，以及如权利要求1～4所述的喷嘴结构；每段冷却器包括对称布置在带钢两侧的喷箱，喷嘴结构设置在喷箱上，喷嘴的喷缝向带钢表面喷吹冷却介质。
  6. 根据权利要求5所述的锌铝镁专用分段式冷却器，其特征在于：所述多段冷却器具体有两段，两段冷却器上下布置，同时带钢走向为从下至上竖直走向。
  7. 根据权利要求5所述的锌铝镁专用分段式冷却器，其特征在于：所述冷却介质为冷却空气。
  8. 根据权利要求5所述的锌铝镁专用分段式冷却器，其特征在于：所述多段冷却器安装在移动台车上，通过移动台车走行。
  9. 根据权利要求8所述的锌铝镁专用分段式冷却器，其特征在于：所述移动台车上还安装有升降装置，通过升降装置控制多段冷却器分段或整体升降。
  10. 根据权利要求5所述的锌铝镁专用分段式冷却器，其特征在于：所述多段冷却器的分段位置设有用于检测带钢表面温度的板温计，通过冷却器的风机调速进行温度控制。
  11. 根据权利要求5所述的锌铝镁专用分段式冷却器，其特征在于：还包括沿带钢走向设于多段冷却器的冷却行程后端且独立控制的辅助冷却器，以适应超厚带钢出花要求。
  12. 根据权利要求11所述的锌铝镁专用分段式冷却器，其特征在于：所述辅助冷却器采用气雾冷却。
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