CN116463573A - Strip steel hot galvanizing furnace nose device capable of removing zinc ash impurities - Google Patents
Strip steel hot galvanizing furnace nose device capable of removing zinc ash impurities Download PDFInfo
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- CN116463573A CN116463573A CN202210031790.4A CN202210031790A CN116463573A CN 116463573 A CN116463573 A CN 116463573A CN 202210031790 A CN202210031790 A CN 202210031790A CN 116463573 A CN116463573 A CN 116463573A
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- zinc
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- overflow plate
- ash
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
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Abstract
The invention discloses a strip steel hot galvanizing furnace nose device capable of removing zinc ash impurities. The furnace nose device comprises a furnace nose (2), an overflow plate (3) and an ash discharge pump (6); the zinc extracting cavity is formed by enclosing an overflow plate and a furnace nose shell; a zinc outlet is formed in the lower part of the zinc pumping cavity, the suction pipe end of the ash discharge pump is communicated with the zinc outlet in the lower part of the zinc pumping cavity through a pipeline (5), and the discharge pipe end of the ash discharge pump is communicated to zinc liquid (7) outside the furnace nose through the pipeline; the height of the middle profile base line of the overflow lip of the overflow plate is higher than that of the profile base lines of the two sides of the overflow lip. In the strip steel hot galvanizing furnace nose device capable of removing zinc ash impurities, the profile base line of the overflow lip edge of the overflow plate adopts a shape with high middle and low two sides, so that zinc liquid at two sides of the overflow plate can be ensured to uniformly overflow into the zinc pumping cavity, the overflow amount is convenient to adjust, and the zinc liquid level collected by zinc ash impurities at two sides in the furnace nose is overflowed preferentially, thereby realizing better zinc ash impurity discharge effect.
Description
Technical Field
The invention relates to a strip steel hot galvanizing furnace nose device, in particular to a strip steel hot galvanizing furnace nose device capable of removing zinc ash impurities.
Background
In modern society production, steel is the most commonly used metal material, however, steel has poor corrosion resistance, and if exposed to the atmosphere for a long period of time, the life thereof is greatly shortened. One of the most commonly used techniques for corrosion protection of steel is a hot dip galvanization technique (abbreviated as hot dip galvanization), specifically, a technique of immersing a steel product in a molten zinc bath and plating a zinc alloy plating layer having good adhesion on the surface of the steel product by reaction and diffusion between iron and zinc.
Referring to fig. 1, fig. 1 shows a hot galvanizing process equipment and flow of the current cold-rolled strip steel. As shown in the figure, the strip steel 1 enters the continuous annealing furnace 8 for annealing treatment before the hot galvanizing process, the strip steel 1 leaves the continuous annealing furnace through the furnace nose 2 after annealing treatment and enters the zinc pot 4 for containing high-temperature zinc liquid 7, the outlet of the furnace nose 2 is immersed in the zinc liquid 7, the strip steel 1 completes the hot galvanizing process in the process of passing through the zinc liquid 7, and then the strip steel 1 leaves the zinc pot 4 after being diverted through the diversion roller 9 and is diverted to the subsequent process.
Because some zinc ash impurities (oxide impurities) often float on the liquid surface of the zinc liquid 7 at the inner side of the furnace nose 2, when the strip steel 1 passes through the liquid surface of the zinc liquid 7, the zinc ash impurities on the liquid surface of the zinc liquid 7 are easy to adhere to the surface of the strip steel 1, so that quality defects such as plating omission, zinc slag and the like on the surface of the strip steel 1 are caused, and the quality of a hot galvanizing process is unqualified.
Aiming at the situation that the impurity floats on the liquid surface of the zinc liquid 7, the prior measures are to arrange a furnace nose device with ash discharging function. The furnace nose device comprises a furnace nose and an ash discharge pump. The zinc extracting cavity with the upper opening and the bottom being closed is arranged at the front side and the rear side (or only at the front side) of the furnace nose, the lower part of the zinc extracting cavity is communicated with a discharge pipeline, the outlet of the discharge pipeline is communicated with zinc liquid outside the furnace nose, the ash discharging pump is arranged in the discharge pipeline, and a baffle plate of the zinc extracting cavity, which is close to the center of the furnace nose (close to strip steel), is an overflow plate.
The height of the zinc liquid level in the zinc pot is adjustable, when the hot galvanizing process is carried out on strip steel, the depth of the zinc liquid immersed in the zinc pot by adjusting the height of the zinc liquid level in the zinc pot can be adjusted, namely, the height of the zinc liquid level in the zinc pot relative to the upper edge (overflow lip) of the overflow plate is adjusted, when the height of the zinc liquid level in the zinc pot is higher than the upper edge of the overflow plate, zinc ash impurities can be carried by the zinc liquid on the zinc liquid level in the zinc pot and overflows into the zinc pumping cavity from the upper edge of the overflow plate, and the ash pump pumps the zinc liquid in the zinc pumping cavity to the zinc liquid outside the zinc pot through the discharge pipeline, so that the zinc liquid level in the zinc pot is kept clean and free of impurities, and the surface quality of the hot galvanizing process is ensured.
Referring to fig. 2, fig. 2 is a schematic view of the upper wide area of the current overflow plate 3, wherein the upper edge of the overflow plate 3 is called an overflow lip, and the zinc liquid in the furnace nose overflows from the overflow lip of the overflow plate 3 to the zinc extracting cavity as indicated by an arrow C in the figure. The overflow lip of the overflow plate 3 is currently of straight shape, which, although simple, has certain drawbacks, in particular: firstly, because the left side and the right side of the overflow plate 3 have a certain height difference, the overflow amount of the zinc liquid at the two sides of the overflow plate 3 is often uneven, and the effect of removing zinc ash impurities is also inconsistent; secondly, since the overflow lip of the overflow plate 3 is flat, the overflow amount of the whole overflow plate 3 is difficult to control, the liquid level of the zinc liquid is slightly raised to generate a large overflow amount, and the liquid level of the zinc liquid is slightly lowered to possibly have no overflow, so that the control and the adjustment of the overflow amount of the overflow plate 3 are difficult; thirdly, zinc ash impurities on the liquid level of the zinc liquid in the furnace nose are often gathered on the left side and the right side of the furnace nose, and the overflow lip of the overflow plate 3 adopts a straight shape, so that the whole liquid level of the zinc liquid is uniformly overflowed, and the overflow is not performed on the two sides where the zinc ash impurities are gathered, and the effect of removing the zinc ash impurities is not ideal.
Australian patent (AU 2017257425 A1) discloses a continuous hot dip coating apparatus and associated method for metal strip and in particular discloses that the furnace nose and overflow vessel can be moved in rotation, belonging to a double sided overflow zinc ash pump, however, no innovative modification of the overflow plate shape structure is mentioned in this patent solution.
U.S. patent (US 9745653B 2) discloses a continuous hot dip coating apparatus for metal strip and in particular a pump for supplying filtered clean zinc liquid zinc ash into the furnace nose, however, no innovative modification of the overflow plate shape structure is mentioned in this patent solution.
In addition, some concepts related to the present invention are further described as follows:
the overflow amount of the overflow plate in the furnace nose is adjusted by adjusting the height of the liquid level of the zinc liquid in the zinc pot, the overflow amount can be increased by lifting the liquid level of the zinc liquid, and the overflow amount can be reduced by reducing the liquid level of the zinc liquid.
Disclosure of Invention
The invention aims to provide a strip steel hot galvanizing furnace nose device capable of removing zinc ash impurities, wherein a profile base line of an overflow lip of an overflow plate adopts a shape with a middle high side and a middle low side, so that a good zinc ash impurity discharge effect is realized.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
a strip steel hot galvanizing furnace nose device capable of removing zinc ash impurities, wherein the furnace nose device is arranged between a continuous annealing furnace and a zinc pot, and the zinc pot is filled with zinc liquid used in a hot galvanizing process; the furnace nose device comprises a furnace nose, an overflow plate and an ash discharge pump; the inlet of the furnace nose is communicated with the outlet of the continuous annealing furnace, and the outlet of the furnace nose is immersed in zinc liquid in the zinc pot; a zinc extracting cavity with an upper opening and a closed bottom is arranged on the inner side of the furnace nose; the zinc extracting cavity is formed by enclosing the overflow plate and the furnace nose shell; the upper edge of the overflow plate is an overflow lip, and the overflow lip of the overflow plate is an edge of an upper opening of the zinc extracting cavity; the lower part of the zinc extracting cavity is provided with a zinc discharging port, the suction pipe end of the ash discharging pump is communicated with the zinc discharging port at the lower part of the zinc extracting cavity through a pipeline, and the discharge pipe end of the ash discharging pump is communicated to zinc liquid outside the furnace nose through a pipeline; the height of the middle profile base line of the overflow lip of the overflow plate is higher than that of the profile base lines of the two sides of the overflow lip, and the heights of the profile base lines of the two sides are symmetrical and consistent.
Further, the profile base line of the overflow lip of the overflow plate is composed of a straight section in the middle and downwardly inclined sections on both sides.
Further, the length of the straight section in the middle of the profile base line of the overflow lip of the overflow plate is selected as the minimum width of strip steel minus 100-200 mm.
Further, the profile base line of the overflow lip of the overflow plate is in an arc shape or a sine curve shape with a positive half period.
Further, the height difference between the highest point in the middle and the lowest points on the two sides of the profile base line of the overflow lip of the overflow plate is 1-10 mm.
Further, the outline of the overflow lip of the overflow plate is wavy.
Further, the outline of the overflow lip of the overflow plate is sine wave-shaped or sawtooth wave-shaped.
Further, the wave-shaped contour line of the overflow lip of the overflow plate has a wavelength of 100-300 mm and an amplitude of 5-30 mm.
Further, the contour line of the overflow lip of the overflow plate coincides with its contour baseline.
Further, the number of the overflow plates is two, two zinc extracting cavities are arranged on the inner side of the furnace nose, and the two zinc extracting cavities are respectively formed by encircling the two overflow plates with the furnace nose shell.
In the furnace nose device, the profile base line of the overflow lip of the overflow plate adopts a shape with high middle and low two sides, and compared with the prior art, the furnace nose device has the beneficial effects that:
1) The zinc liquid at two sides of the overflow plate can be ensured to uniformly overflow into the zinc pumping cavity;
2) Even if the liquid level of the zinc liquid in the zinc pot rises and falls to a certain extent, the overflow amount can not change greatly, so that the overflow amount is convenient to adjust;
3) The zinc liquid level collected by zinc ash impurities at two sides in the furnace nose overflows preferentially, so that a better zinc ash impurity discharging effect is realized.
Drawings
FIG. 1 is a schematic diagram of a hot dip galvanizing process equipment and flow chart of a strip steel;
FIG. 2 is a schematic view of the upper wide-format structure of the overflow plate in the prior art furnace nose device;
FIG. 3 is a schematic view of a hot dip zinc strip furnace nose arrangement for removing zinc ash impurities according to the present invention, showing the strip entering the zinc bath from the furnace nose;
fig. 4 is a schematic view showing the structure of the upper wide surface of the overflow plate in the furnace nose device according to embodiment 1 of the present invention;
fig. 5 is a schematic view showing the structure of the upper wide surface of the overflow plate in the furnace nose device according to embodiment 2 of the present invention;
fig. 6 is a schematic view showing the structure of the upper wide surface of the overflow plate in the furnace nose device according to embodiment 3 of the present invention;
fig. 7 is a schematic view showing the structure of the upper wide surface of the overflow plate in the furnace nose device according to embodiment 4 of the present invention.
In the figure: 1-band steel, 2-furnace nose, 3-overflow plate, 4-zinc pot, 5-pipeline, 6-ash pump, 7-zinc liquid, 8-continuous annealing furnace and 9-steering roller.
Detailed Description
The invention is further described with reference to the drawings and the specific embodiments below:
embodiment 1:
referring to fig. 3, embodiment 1 provides a hot dip zinc plating furnace nose device capable of removing zinc ash impurities, which is arranged between a continuous annealing furnace and a zinc pot 4, wherein the zinc pot 4 contains zinc liquid 7 used in a hot dip zinc plating process.
The furnace nose device of embodiment 1 includes a furnace nose 2, two overflow plates 3, and an ash pump 6.
The inlet of the furnace nose 2 is communicated with the outlet (not shown in the figure) of the continuous annealing furnace, and the outlet of the furnace nose 2 is immersed in the zinc liquid 7 in the zinc pot 4.
Two zinc extracting cavities with upper openings and closed bottoms are arranged on the inner side of the furnace nose 2, and are respectively formed by enclosing two overflow plates 3 with the furnace nose 2 shell as indicated by an arrow A and an arrow B in the figure.
The upper edge of the overflow plate 3 is an overflow lip, the overflow lip of the overflow plate 3 is an edge of an opening at the upper part of the zinc extracting cavity, the overflow plate 3 is used for overflowing zinc ash impurities on the liquid surface of the zinc liquid 7 in the furnace nose 2 to the zinc extracting cavity, and during overflow, the zinc liquid on the liquid surface of the zinc liquid 7 in the furnace nose 2 can overflow into the zinc extracting cavity from the overflow lip of the overflow plate 3 with the zinc ash impurities. The lower part of the zinc pumping cavity is provided with a zinc discharging port, the suction pipe end of the ash discharging pump 6 is communicated with the zinc discharging port at the lower part of the zinc pumping cavity through a pipeline 5, and the discharge pipe end of the ash discharging pump 6 is communicated to zinc liquid 7 outside the furnace nose 2 through the pipeline 5.
Referring to fig. 4, in the furnace nose device of embodiment 1, the outline of the overflow lip of the overflow plate 3 is not a flat straight line, but has a shape with a high middle and a low side. Specifically, the height of the profile line in the middle of the overflow lip is higher than that of the profile lines on two sides of the overflow lip, the heights of the profile lines on two sides are symmetrical and consistent, the profile line of the whole overflow lip consists of a straight section in the middle and downward inclined sections on two sides, and the profile line of the overflow lip is in an upper half trapezoid shape as a whole. The length of the straight section in the middle of the outline of the overflow lip is preferably the minimum width of the strip steel minus 100-200 mm. The height difference between the highest point of the middle part and the lowest points of the two sides of the profile line of the overflow lip is preferably 1-10 mm.
In the furnace nose device of embodiment 1, when the overflow plate 3 overflows, in the process of adjusting the level of the zinc liquid 7 to rise gradually, the zinc liquid 7 in the furnace nose 2 overflows from both sides of the overflow lip of the overflow plate 3 into the zinc extracting cavity, and then slowly overflows from the middle part of the overflow lip, and the overflow amount of both sides of the overflow lip of the overflow plate 3 is larger than that of the middle part.
In embodiment 1, the contour line of the overflow lip of the overflow plate 3 is formed to have a high middle and low sides, and the advantage is that: the zinc liquid 7 at two sides of the furnace nose 2 can be ensured to uniformly overflow into the zinc extracting cavity; even if the liquid level of the zinc liquid 7 in the zinc pot rises and falls to a certain extent, the overflow amount can not change greatly, so that the overflow amount is convenient to adjust; the zinc liquid level collected by zinc ash impurities at two sides in the furnace nose overflows preferentially, so that a better zinc ash impurity discharging effect is realized.
Embodiment 2:
referring to fig. 5, embodiment 2 provides a hot dip zinc-ash-free strip steel furnace nose device, which is basically identical to that of embodiment 1 in terms of basic concept, and differs from that of embodiment 1 only in terms of the outline shape of the overflow lip of the overflow plate 3. In embodiment 2, the outline of the overflow lip of the overflow plate 3 is circular arc-shaped.
Embodiment 3:
referring to fig. 6, embodiment 3 provides a hot dip zinc-ash-free strip steel furnace nose device, which is basically identical to that of embodiment 1 in terms of basic concept, and differs from that of embodiment 1 only in terms of the shape of the outline of the overflow lip of the overflow plate 3. In embodiment 3, the contour of the overflow lip of the overflow plate 3 has a positive half-cycle sinusoidal shape.
Embodiment 4:
referring to fig. 7, embodiment 4 provides a hot dip zinc-ash-free strip steel furnace nose device, which is basically identical to that of embodiment 1 in terms of basic concept, and differs from that of embodiment 1 only in terms of the outline shape of the overflow lip of the overflow plate 3. In embodiment 4, the outline of the overflow lip of the overflow plate 3 is entirely wavy, and the middle line of the wavy outline of the overflow lip is defined as the outline base line of the overflow lip (broken line in fig. 7), so that the outline base line of the overflow lip takes on a form with a high middle and a low side. Specifically, the height of the profile base line in the middle of the overflow lip is higher than that of the profile base lines on two sides of the overflow lip, the heights of the profile base lines on two sides are symmetrical and consistent, the profile base line of the whole overflow lip consists of a straight section in the middle and downward inclined sections on two sides, and the profile base line of the overflow lip is in an upper half trapezoid shape as a whole. The length of the straight section in the middle of the profile base line of the overflow lip is preferably the minimum width of the strip steel minus 100-200 mm. The height difference between the highest point of the middle part and the lowest points of the two sides of the profile base line of the overflow lip is preferably 1-10 mm.
Preferably, the outline of the overflow lip is in a sine waveform, the wavelength of the sine waveform is preferably 100-300 mm, and the amplitude of the sine waveform is preferably 5-30 mm.
In other embodiments, the profile of the overflow lip may also take the form of a saw tooth waveform.
In embodiment 4, the overflow lip of the overflow plate 3 adopts a wavy contour, which has the advantage that: even under the condition of larger adjustment range of the liquid level of the zinc liquid in the zinc pot, the whole overflow plate can still be ensured to overflow normally and uniformly.
In other embodiments, the profile base line of the overflow lip of the overflow plate may also take the form of a circular arc or a positive half-cycle sinusoidal curve, etc., the form of which may be referred to the profile of the overflow lip described in embodiments 2 and 3.
With respect to embodiments 1, 2 and 3, it should be noted that in these embodiments, the overflow lip of the overflow plate may also be considered to have a contoured base line, and the contour of the overflow lip may be considered to be coincident with the contoured base line, or alternatively, the contour of the overflow lip may be the contoured base line.
With reference to the furnace nose devices provided in the above embodiments 1 to 4, the overflow plate 3 thereof can be summarized as follows: the height of the middle profile base line of the overflow lip of the overflow plate 3 is higher than that of the profile base lines at the two sides of the overflow lip, and the heights of the profile base lines at the two sides are symmetrical and consistent.
In other embodiments, the profile base line shape of the overflow lip of the overflow plate is not limited to the upper half trapezoid shape, the circular arc shape and the positive half-cycle sine curve shape mentioned in the above embodiments, but may be other shapes as long as the profile base line height in the middle of the overflow lip of the overflow plate is higher than the profile base line heights on both sides thereof and the profile base lines on both sides are symmetrically identical in height.
The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention, therefore, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A strip steel hot galvanizing furnace nose device capable of removing zinc ash impurities, wherein the furnace nose device is arranged between a continuous annealing furnace and a zinc pot (4), and the zinc pot (4) is used for containing zinc liquid (7) used in a hot galvanizing process;
the furnace nose device comprises a furnace nose (2), an overflow plate (3) and an ash discharge pump (6); the inlet of the furnace nose (2) is communicated with the outlet of the continuous annealing furnace, and the outlet of the furnace nose (2) is immersed in zinc liquid (7) in the zinc pot (4); a zinc extracting cavity with an upper opening and a closed bottom is arranged on the inner side of the furnace nose (2);
the method is characterized in that: the zinc extracting cavity is formed by enclosing the overflow plate (3) and the shell of the furnace nose (2); the upper edge of the overflow plate (3) is an overflow lip, and the overflow lip of the overflow plate (3) is an edge of an upper opening of the zinc extracting cavity; the lower part of the zinc extracting cavity is provided with a zinc discharging port, the suction pipe end of the ash discharging pump (6) is communicated with the zinc discharging port at the lower part of the zinc extracting cavity through a pipeline (5), and the discharge pipe end of the ash discharging pump (6) is communicated to zinc liquid (7) outside the furnace nose (2) through the pipeline (5);
the height of the middle profile base line of the overflow lip of the overflow plate (3) is higher than that of the two side profile base lines of the overflow plate, and the heights of the two side profile base lines are symmetrical and consistent.
2. The steel strip hot galvanizing furnace nose device capable of removing zinc ash impurities according to claim 1, wherein: the profile base line of the overflow lip of the overflow plate (3) is composed of a straight section in the middle and downward inclined sections on two sides.
3. The steel strip hot galvanizing furnace nose device capable of removing zinc ash impurities according to claim 2, wherein: the length of the straight section in the middle of the profile base line of the overflow lip of the overflow plate (3) is selected as the minimum width of strip steel minus 100-200 mm.
4. The steel strip hot galvanizing furnace nose device capable of removing zinc ash impurities according to claim 1, wherein: the profile base line of the overflow lip of the overflow plate (3) is in an arc shape or a sine curve shape with a positive half period.
5. The steel strip hot galvanizing furnace nose device capable of removing zinc ash impurities according to claim 1, wherein: the height difference between the highest point in the middle and the lowest points on the two sides of the profile base line of the overflow lip of the overflow plate (3) is 1-10 mm.
6. The steel strip hot galvanizing furnace nose arrangement which can remove zinc ash impurities according to any of claims 1-5, characterized in that: the outline of the overflow lip of the overflow plate (3) is wavy.
7. The steel strip hot galvanizing furnace nose device capable of removing zinc ash impurities according to claim 6, wherein: the outline of the overflow lip of the overflow plate (3) is in a sine wave shape or a sawtooth wave shape.
8. The steel strip hot galvanizing furnace nose device capable of removing zinc ash impurities according to claim 6, wherein: the wave-shaped contour line of the overflow lip edge of the overflow plate (3) has a wavelength of 100-300 mm and an amplitude of 5-30 mm.
9. The steel strip hot galvanizing furnace nose arrangement which can remove zinc ash impurities according to any of claims 1-5, characterized in that: the contour line of the overflow lip of the overflow plate (3) coincides with the contour base line thereof.
10. The steel strip hot galvanizing furnace nose device capable of removing zinc ash impurities according to claim 1, wherein: the number of the overflow plates (3) is two, two zinc extracting cavities are arranged on the inner side of the furnace nose (2), and the two zinc extracting cavities are respectively formed by encircling the two overflow plates (3) with the furnace nose (2) shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210031790.4A CN116463573A (en) | 2022-01-12 | 2022-01-12 | Strip steel hot galvanizing furnace nose device capable of removing zinc ash impurities |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210031790.4A CN116463573A (en) | 2022-01-12 | 2022-01-12 | Strip steel hot galvanizing furnace nose device capable of removing zinc ash impurities |
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| CN116463573A true CN116463573A (en) | 2023-07-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210031790.4A Pending CN116463573A (en) | 2022-01-12 | 2022-01-12 | Strip steel hot galvanizing furnace nose device capable of removing zinc ash impurities |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117966067A (en) * | 2024-04-02 | 2024-05-03 | 上海东新冶金技术工程有限公司 | Heating mechanism for hot galvanizing furnace nose |
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2022
- 2022-01-12 CN CN202210031790.4A patent/CN116463573A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117966067A (en) * | 2024-04-02 | 2024-05-03 | 上海东新冶金技术工程有限公司 | Heating mechanism for hot galvanizing furnace nose |
| CN117966067B (en) * | 2024-04-02 | 2024-06-11 | 上海东新冶金技术工程有限公司 | Heating mechanism for hot galvanizing furnace nose |
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