CN108441801B - Method for improving coating uniformity of hot-dip galvanized steel pipe - Google Patents
Method for improving coating uniformity of hot-dip galvanized steel pipe Download PDFInfo
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- CN108441801B CN108441801B CN201810460797.1A CN201810460797A CN108441801B CN 108441801 B CN108441801 B CN 108441801B CN 201810460797 A CN201810460797 A CN 201810460797A CN 108441801 B CN108441801 B CN 108441801B
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- 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
- C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
- C23C2/16—Removing excess of molten coatings; Controlling or regulating the coating thickness using fluids under pressure, e.g. air knives
- C23C2/18—Removing excess of molten coatings from elongated material
- C23C2/185—Tubes; Wires
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- 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
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- Mechanical Engineering (AREA)
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- Organic Chemistry (AREA)
- Coating With Molten Metal (AREA)
Abstract
The invention relates to a method for improving coating uniformity of a hot-dip galvanized steel pipe, and belongs to the technical field of galvanized steel pipes. The method comprises the following steps: the steel pipe is removed from the galvanizing liquid and penetrates into an external blowing device along the axial direction; introducing heated air or gas into an external blowing device, and blowing the steel pipe with the galvanizing liquid on the surface; preparing the steel pipe subjected to the external blowing into a finished galvanized steel pipe; measuring the thickness of a coating of the galvanized steel pipe; adjusting the pressure of the air introduced into an upper blowing chamber and a lower blowing chamber of the external blowing device according to the measurement result; and (4) producing the galvanized steel pipes in batches. The inside of the external blowing device adopted by the invention is divided into an upper blowing chamber and a lower blowing chamber, and gases with different pressures are introduced, so that the condition that more zinc plating liquid and less zinc plating liquid are generated under the action of gravity is avoided, and the zinc plating layer of the galvanized pipe passing through the external blowing device can still be ensured to be uniform in thickness.
Description
Technical Field
The invention relates to the technical field of galvanized steel pipes, in particular to a method for improving coating uniformity of a hot-dip galvanized steel pipe.
Background
The steel pipe can attach redundant zinc liquid on the surface of the steel pipe when leaving the zinc liquid, the redundant zinc liquid is blown away by the annular air knife and flows back to a zinc pot after the steel pipe leaves the zinc liquid, the prior art adopts the whole cavity type annular air knife, the air pressure in the cavity is equal, the inner diameter of the air outlet is equal, the pressure and the angle of the air outlet are equal, but due to the length limitation of the steel pipe, the steel pipe can only pass through the blowing ring under the horizontal state with a certain upper inclination angle, the zinc liquid on the surface of the steel pipe can flow downwards under the action of gravity, so that the thickness difference of a plating layer is generated after the zinc liquid at the upper end and the lower end of the section of the steel pipe is cooled, namely the thickness of the plating layer at the lower half part of; in order to ensure the requirement of the thickness of the steel pipe coating, the average coating thickness is often more than ten or even twenty microns higher than the requirement of the coating thickness, and the zinc consumption of the product is increased.
Disclosure of Invention
In view of the above analysis, the present invention aims to provide a method for improving the coating uniformity of a hot-dip galvanized steel pipe, so as to solve the problems of uneven coating thickness and/or reduced amount of coating consumables of a galvanized pipe manufactured by the existing method.
The purpose of the invention is mainly realized by the following technical scheme:
a method for improving the coating uniformity of a hot-dip galvanized steel pipe comprises the following steps:
the steel pipe is removed from the galvanizing liquid and penetrates into an external blowing device along the axial direction; introducing gas into an external blowing device, and blowing the steel pipe with the zinc plating solution on the surface; preparing the steel pipe subjected to the external blowing into a finished galvanized steel pipe; measuring the thickness of a coating of the galvanized steel pipe; adjusting the gas pressure of an upper blowing chamber and a lower blowing chamber which are introduced into the external blowing device according to the measurement result; and (4) producing the galvanized steel pipes in batches.
The external blowing device is not communicated with an upper blowing chamber and a lower blowing chamber, and the upper blowing chamber and the lower blowing chamber form a ring shape.
The upper blowing chamber and the lower blowing chamber are of an integrated structure, and the upper blowing chamber and the lower blowing chamber are separated by a partition plate.
The upper blowing chamber and the lower blowing chamber are both in a semicircular ring shape, the upper blowing chamber is provided with an upper air inlet, and the lower blowing chamber is provided with a lower air inlet.
The inner side surface of the external blowing device is the side surface of the circular truncated cone, and the taper angle of the inner side surface of the external blowing device is 30-70 degrees;
the inner side surface of the external blowing device is provided with an air outlet, and the included angle between the axis of the air outlet and the axis of the external blowing device is 45-70 degrees.
48 air outlets are formed, the air outlets are located on the same plane perpendicular to the axis of the external blowing device, and the inner side face of the external blowing device is uniformly distributed along the circumferential direction.
The axes of the upper air inlet and the lower air inlet are overlapped, and the axes of the upper air inlet and the lower air inlet are vertical to the clapboard.
The lateral surface of outer blast apparatus is equipped with 2 fixed knot and constructs, and fixed knot constructs and the plane parallel at baffle place for be connected and fixed with the mount.
The fixing structure is a thin plate and is provided with a U-shaped groove with an opening facing the direction far away from the axis of the external blowing device.
When the thickness of the coating of the galvanized steel pipe is larger than the target thickness, increasing the pressure of gas introduced into the external blowing device;
when the thickness of the coating of the galvanized steel pipe is smaller than the target thickness, reducing the pressure of gas introduced into the external blowing device;
and when the thickness of the coating of the galvanized steel pipe is equal to the target thickness, the pressure of the gas introduced into the external blowing device is not adjusted.
The invention has the beneficial effects that:
the inside of the external blowing device is divided into an upper blowing chamber and a lower blowing chamber, and gases with different pressures are introduced, so that the condition that more zinc plating liquid and less zinc plating liquid are generated on the surface of the steel pipe under the action of gravity is avoided, and the zinc plating pipe passing through the external blowing device can still ensure the uniform thickness of a zinc plating layer; and the blowing pressure is adjusted by measuring the thickness of the coating, so that the qualified galvanized steel pipe can be continuously produced.
In the invention, the technical schemes can be combined with each other to realize more preferable combination schemes. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout.
Fig. 1 is a front view of an external blowing device used in the present invention;
fig. 2 is a sectional view of a section a-a in a front view of an external blowing device used in the present invention;
fig. 3 is a perspective view of an external blowing device used in the present invention;
fig. 4 is a sectional view of a perspective view of an external blowing device used in the present invention.
Reference numerals: 101-an upper inlet; 102-lower inlet; 201-an upper blowing chamber; 202-down blowing chamber; 3-a separator; 4-air outlet holes.
Detailed Description
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate preferred embodiments of the invention and together with the description, serve to explain the principles of the invention and not to limit the scope of the invention.
A method for improving the coating uniformity of a hot-dip galvanized steel pipe comprises the following steps:
s1, moving the steel pipe out of the galvanizing liquid, penetrating the steel pipe into an external blowing device along the axial direction, performing preparation work, setting the speed of the steel pipe entering the external blowing device, and keeping the speed unchanged to ensure that the thickness of the galvanizing liquid on the steel pipe is consistent after external blowing;
s2, introducing the heated gas into the external blowing device, and setting the pressure of the gas, wherein the pressure of the gas can be set generally according to experience or according to a test result carried out in advance; blowing air outside the steel pipe with the galvanizing liquid on the surface to blow off the excessive galvanizing liquid on the outer surface of the steel pipe;
s3, preparing the steel pipe subjected to external blowing into a finished galvanized steel pipe, wherein the finished galvanized steel pipe can be prepared by adopting a traditional process;
s4, measuring the thickness of the coating of the galvanized steel pipe, and directly measuring the thickness of the coating by using the prior art;
s5, adjusting the pressure of the air introduced into the upper blowing chamber and the lower blowing chamber of the external blowing device according to the measurement result; when the thickness of the coating of the galvanized steel pipe is larger than the target thickness, increasing the gas pressure introduced into the external blowing device; when the thickness of the coating of the galvanized steel pipe is smaller than the target thickness, reducing the pressure of gas introduced into the external blowing device; when the thickness of the coating of the galvanized steel pipe is equal to the target thickness, the pressure of the gas introduced into the external blowing device is not adjusted;
and S6, taking the pressure adjusted in the previous step as the pressure of the gas introduced into the external blowing device, and carrying out batch production on the galvanized steel pipes, namely, the batch production can be carried out on the premise of ensuring that the thickness of the coating meets the requirement.
The external blowing device used in the embodiment of the invention: the air blower comprises an upper blowing chamber 201 and a lower blowing chamber 202 which are not communicated with each other, wherein the upper blowing chamber 201 and the lower blowing chamber 202 form a ring shape. When the galvanized steel pipe passes through the external blowing device, the galvanized liquid on the upper half part of the steel pipe is less and the galvanized liquid on the lower half part of the steel pipe is more due to the action of gravity, so that the external blowing device is arranged into an upper cavity and a lower cavity, the gas pressure in the upper blowing chamber and the lower blowing chamber is adjusted according to different requirements, the thickness of the galvanized layers on the upper half part and the lower half part of the galvanized steel pipe is ensured to be consistent, and the consumption of plating materials is also saved.
The upper blowing chamber 201 and the lower blowing chamber 202 are connected through a detachable structure, so that the installation and the disassembly are convenient, and the maintenance is convenient. Alternatively, the upper blowing chamber 201 and the lower blowing chamber 202 are of an integral structure, and the upper blowing chamber 201 and the lower blowing chamber 202 are separated by the partition plate 3. The two modes ensure that the upper blowing chamber 201 and the lower blowing chamber 202 are not communicated with each other and are integrally formed into a ring shape.
The upper blowing chamber 201 and the lower blowing chamber 202 are both semicircular, the upper blowing chamber 201 is provided with an upper air inlet 101, the lower blowing chamber 202 is provided with a lower air inlet 102, and air with different pressures is respectively introduced into the upper air inlet 101 and the lower air inlet 102. The upper blowing chamber 201 and the upper air inlet 101, and the lower blowing chamber 202 and the lower air inlet 102 are connected in an integrated structure or in a threaded manner, and sealing rings are arranged at the threaded connection positions.
The inner side surface of the external blowing device is the side surface of the circular truncated cone, and the taper angle of the inner side surface of the external blowing device is 30-70 degrees. The angle is set to be beneficial to the external blowing device to blow off the redundant galvanizing liquid on the galvanized steel pipe.
The inner side surface of the external blowing device is provided with an air outlet 4, and the included angle between the axis of the air outlet 4 and the axis of the external blowing device is 45-70 degrees. The angle is set to be beneficial to the external blowing device to blow off the redundant galvanizing liquid on the galvanized steel pipe. The air outlet holes 4 are arranged in a plurality of the planes which are perpendicular to the axis of the external blowing device and are at least 1, at least 2 air outlet holes 4 are arranged on each plane, and the air outlet holes 4 on the same plane are uniformly distributed along the circumferential direction.
In order to ensure good and uniform air blowing effect, in the embodiment of the invention, 48 air outlet holes 4 are arranged and are all positioned on the same plane vertical to the axis of the external air blowing device, and the inner side surfaces of the external air blowing device are uniformly distributed along the circumferential direction.
The axes of the upper intake port 101 and the lower intake port 102 coincide, and the axes of the upper intake port 101 and the lower intake port 102 are perpendicular to the partition plate 3. By the design, the production and the manufacture of the whole external blowing device are facilitated.
Considering that the external blowing device needs to be fixed when in use, the outer side surface of the external blowing device is provided with at least 1 fixing structure for being connected and fixed with the fixing frame.
The fixing structure is a thin plate and is used for ensuring the purposes of connection and fixation while ensuring the structural strength; the fixing structure is provided with a U-shaped groove with an opening facing the direction far away from the axis of the external blowing device, so that the fixing structure is convenient to fix.
Fixed knot constructs and is equipped with 2, and is parallel with 3 place planes of baffle, can further improve overall structure's intensity with 3 coplaner fixed knot of baffle, prevents that equipment from damaging.
The whole external blowing device is made of stainless steel or cast iron materials, and the stainless steel has good structural strength.
When the hot-dip galvanized steel pipe leaves from the molten zinc and enters through one side of the inner side of the outer blowing device, the air flow blown out from the air outlet 4 forms an air knife to blow off the redundant molten zinc on the surface of the steel pipe, and the pressure of the air blown out from the air outlet 4 of the upper blowing chamber 202 and the pressure of the air blown out from the air outlet 4 of the lower blowing chamber 202 are different, so that the thickness of the coating on the surface of the steel pipe is controlled under the dual effects of the air knife blowing pressure difference and the gravity of the molten zinc, the thickness difference of the coatings on the upper surface and the lower surface of the steel pipe is reduced.
The galvanized steel pipes with the wall thicknesses of 10mm and 5mm are prepared by the method and are marked as example 1 and example 2, the coating thickness in the circumferential direction of the section is measured, four measuring points are sequentially taken during measurement, the upper end, the left end, the lower end and the right end on the circumference of the section are sequentially corresponding, and the coating thickness corresponding to each measuring point is respectively recorded. For comparison, galvanized steel pipes with the wall thicknesses of 10mm and 5mm are prepared by using a traditional process and are marked as a comparative example 1 and a comparative example 2, the coating thickness in the circumferential direction of the cross section is measured, four measuring points are sequentially taken during measurement, the upper end, the left end, the lower end and the right end on the circumference of the cross section are sequentially corresponding, and the coating thickness corresponding to each measuring point is respectively recorded. Specific measurement results are shown in table 1.
TABLE 1 comparison of measurement results
| Comparative example 1 | Comparative example 2 | Example 1 | Example 2 | |
| Wall thickness | 10mm | 5mm | 10mm | 5mm |
| Measuring point 1 | 76.4μm | 62.6μm | 83.6μm | 69.2μm |
| Measuring point 2 | 86.7μm | 70.3μm | 84.7μm | 69.8 |
| Measuring point | ||||
| 3 | 92.5μm | 77.4μm | 86.1μm | 71.1 |
| Measuring point | ||||
| 4 | 82.1μm | 70.4μm | 85.6μm | 69.7μm |
As is apparent from the data in Table 1, the thickness of the coating of the galvanized steel pipe is significantly more uniform after the method of the present invention is used. When the galvanized steel pipe is produced and prepared, the average thickness of the coating is 85 micrometers for the galvanized steel pipe with the wall thickness of more than 6mm, and the average thickness of the coating is 70 micrometers for the galvanized steel pipe with the wall thickness of less than or equal to 6mm and more than or equal to 3mm, so that the difference between the coating thickness of the galvanized steel pipe prepared by the method and the requirement on the coating thickness in the production standard is smaller
Those skilled in the art will appreciate that all or part of the flow of the method implementing the above embodiments may be implemented by a computer program, which is stored in a computer readable storage medium, to instruct related hardware. The computer readable storage medium is a magnetic disk, an optical disk, a read-only memory or a random access memory.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (4)
1. A method for improving the coating uniformity of a hot-dip galvanized steel pipe, which is characterized by comprising the following steps:
the steel pipe is removed from the galvanizing liquid and penetrates into an external blowing device along the axial direction; introducing heating gas into an external blowing device, and blowing the steel pipe with the zinc plating solution on the surface; preparing the steel pipe subjected to the external blowing into a finished galvanized steel pipe; measuring the thickness of a coating of the galvanized steel pipe; adjusting the pressure of the gas introduced into an upper blowing chamber (201) and a lower blowing chamber (202) of the external blowing device according to the measurement result; producing galvanized steel pipes in batches;
the upper blowing chamber (201) and the lower blowing chamber (202) are not communicated and form a ring shape;
the upper blowing chamber (201) and the lower blowing chamber (202) are of an integrated structure, and the upper blowing chamber (201) and the lower blowing chamber (202) are separated by a partition plate (3);
the upper blowing chamber (201) and the lower blowing chamber (202) are both semicircular, the upper blowing chamber (201) is provided with an upper air inlet (101), and the lower blowing chamber (202) is provided with a lower air inlet (102);
the inner side surface of the external blowing device is a side surface of a circular truncated cone, and the taper angle of the inner side surface of the external blowing device is 30-70 degrees;
an air outlet hole (4) is formed in the inner side face of the external blowing device, and the included angle between the axis of the air outlet hole (4) and the axis of the external blowing device is 45-70 degrees;
the axes of the upper air inlet (101) and the lower air inlet (102) are superposed, and the axes of the upper air inlet (101) and the lower air inlet (102) are vertical to the partition plate (3);
the outer side face of the outer blowing device is provided with 2 fixing structures, and the fixing structures are parallel to the plane where the partition plate (3) is located and used for being connected with and fixed to the fixing frame.
2. The method according to claim 1, wherein 48 air outlet holes (4) are provided, all of which are located on the same plane perpendicular to the axis of the external blowing device, and the inner side surfaces of the external blowing device are uniformly distributed along the circumferential direction.
3. The method according to claim 1, characterized in that the fixed structure is a thin plate provided with a U-shaped slot opening away from the axis of the external blowing device.
4. The method according to any one of claims 1 to 3, wherein when the coating thickness of the galvanized steel pipe is greater than a target thickness, the pressure of gas introduced into the external blowing device is increased;
when the thickness of the coating of the galvanized steel pipe is smaller than the target thickness, reducing the pressure of gas introduced into the external blowing device;
and when the thickness of the coating of the galvanized steel pipe is equal to the target thickness, the pressure of the gas introduced into the external blowing device is not adjusted.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810460797.1A CN108441801B (en) | 2018-05-15 | 2018-05-15 | Method for improving coating uniformity of hot-dip galvanized steel pipe |
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| CN201810460797.1A CN108441801B (en) | 2018-05-15 | 2018-05-15 | Method for improving coating uniformity of hot-dip galvanized steel pipe |
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| CN108441801B true CN108441801B (en) | 2020-07-07 |
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| CN109355607A (en) * | 2018-12-21 | 2019-02-19 | 重庆佰鸿机械设备有限公司 | A kind of steel tube hot galvanizing device |
| CN110408876B (en) * | 2019-09-03 | 2020-06-26 | 南通鑫祥锌业有限公司 | Hot galvanizing hanger |
| CN113005385A (en) * | 2019-12-20 | 2021-06-22 | 新绛天地和金属制品有限公司 | Method for improving coating uniformity of hot-dip galvanized steel pipe |
| CN117265449B (en) * | 2023-11-21 | 2024-03-19 | 江苏友发钢管有限公司 | Steel pipe galvanization wind ring control system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013080910A1 (en) * | 2011-11-28 | 2013-06-06 | 株式会社Ｎｅｏｍａｘマテリアル | Gas nozzle for controlling plated membrane thickness and hot-dip apparatus using same |
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| BE896703A (en) * | 1983-05-09 | 1983-11-09 | Centre Rech Metallurgique | Thickness control of molten metal coatings - blowing gas stream onto coating, esp. during hot dip zinc coating of steel strip or wire |
| CN1170953C (en) * | 2000-12-22 | 2004-10-13 | 吕一民 | Alloy hot-dipping process and equipment for high-precision thin-wall pipe |
| CN201144275Y (en) * | 2007-12-27 | 2008-11-05 | 大庆石油学院 | Simple highly-effective multi-group hot dip ring-shaped air knife device |
| CN204022927U (en) * | 2014-06-23 | 2014-12-17 | 宝钢集团新疆八一钢铁有限公司 | Blow gun in improved hot-dip galvanized steel pipe production line |
| CN206706182U (en) * | 2017-03-29 | 2017-12-05 | 天津源泰德润钢管制造集团有限公司 | Residual liquid processing apparatus in a kind of zinc-plated rear steel pipe |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013080910A1 (en) * | 2011-11-28 | 2013-06-06 | 株式会社Ｎｅｏｍａｘマテリアル | Gas nozzle for controlling plated membrane thickness and hot-dip apparatus using same |
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