KR0128545Y1 - Zn-dust removing apparatus in snout - Google Patents

Abstract

The present invention forcibly deposits zinc evaporated powder into the dust collection tube by the temperature difference using the cooling effect of the fin tube inside the snout, and removes it by vacuum suction pressure to unplat the zinc dust strip during plating. The present invention relates to a zinc dust (Zn dust) removal device of a snout of a galvanizing production facility that can keep the inside of the snout clean.

The present invention extends along the inner surface of the snout to form a rectangular structure, and forms a space in which the strip proceeds inside the rectangular structure, and both side ends extend outward of the snout, and the lower surface faces the molten zinc surface. A dust collecting tube each having an enlarged opening; A suction pump connected to one end of the dust collecting tube through a flexible conduit to generate a suction force in the dust collecting tube; And, in the dust collection tube of the inside of the snout and extending along the square structure, both ends are drawn out to the outside of the snout, the outer peripheral surface is equipped with a plurality of heat dissipation fins for increasing the heat transfer area while the coolant flows through the coolant pipe; The present invention provides a zinc dust removal apparatus in a snout of a zinc plating production facility, including collecting zinc powder in a snout into a dust collecting tube by using a temperature difference, and extracting and removing zinc powder to an outside as a suction pump.

Description

Zinc dust removal device in the snout of galvanizing production equipment

1 is a partial cutaway perspective view of the zinc dust removing device according to the present invention equipped with a snout.

2 is a cross-sectional view taken along the line A-A of FIG.

Figure 3 is an explanatory view showing a zinc dust removal method according to the prior art.

4 is an explanatory diagram showing a state in which zinc dust is attached to a snout in a general galvanizing production facility.

5 is an overall process diagram of the galvanizing production equipment.

* Explanation of symbols for main parts of the drawings

10: dust collecting tube 15: on-off valve

20: suction pump 22: opening

25: guide plate 30: cooling water pipe

32: heat sink fin 350: zinc plating bath

353 Snout 358 Molten zinc plating solution

D: Dust S: Strip

The present invention relates to a device for removing zinc dust in a snout by zinc evaporation in a continuous galvanized steel sheet production equipment. In particular, the zinc evaporation powder is forced into a dust collecting tube by a temperature difference using a cooling effect of a fin tube inside the snout. Deposition and removal by vacuum suction pressure prevents the unplating of the strip by zinc dust generated during the plating operation, as well as the zinc dust in the snout of the zinc plating production facility that can keep the inside of the snout clean. Zn dust) removal apparatus.

In general, a continuous galvanized steel sheet production equipment using a cold rolled coil (Coil) is a cold rolled steel sheet in the form of a coil (Coil) from the pay off reel 310 as shown in FIG. After passing through the entrance looper (330) to proceed to the heat treatment furnace 340 and the galvanizing bath 350 is made of plating. The cold-rolled steel sheet plated as described above passes through the air cooling device 360 and the water cooling device 370 to enter a skin pass mill 380 to remove shape correction and internal stress, thereby improving corrosion resistance. It is transferred to the chrome treatment facility 390 for chemical treatment, and again passes through the dryer 400 and passes through the exit looper 410 to the coil form 420 in the tension reel (Tension Reel) as the final demand demand And sheet 430 in a filer and a piler. In addition, in the galvanizing tank 350, as shown in FIG. 4, the strip having passed through the bell roll 352 enters the snout 353 and reacts with zinc (Zn). The direction is changed vertically by the deflection roll (355) inside the bath (350) to proceed from the galvanizing bath 350 to the outside and the plating amount by the air knife (357) on the top of the galvanizing bath (350). This is to be controlled.

On the other hand, the zinc evaporation is carried out from the molten zinc plating solution 358 in the snout 353, the zinc melting point is approximately 420 ℃, the operating temperature of the zinc plating bath is controlled to approximately 455-465 ℃ zinc evaporation amount Is increased and the amount of Zn dust increases in proportion to the temperature rise. Therefore, the zinc dust D evaporated from the molten zinc plating solution 358 is deposited on the bell roll 352, the inner wall surface of the snout 353, and the molten zinc plating solution 358 in the snout 353, respectively. . These zinc dusts (D) are gradually grown in size over time to reach the surface of the strip (S), in this process the zinc dust (D) attached to the surface of the strip (S) in the form of a strip ( During the plating operation of S), the galvanization was not performed well, which left a fatal defect in the finished product.

Therefore, in the prior art of removing the zinc dust (D) in the snout (353), as shown in Figure 3, by opening and closing the gate (Gate Hole) 359 provided in the snout (353) Two workers with the (100) lamp was to remove the zinc dust (D) while illuminating the lamp 120.

However, the conventional method as described above is not only impossible to operate when the production line is operating, but also due to the high temperature generated in the galvanizing bath, the working speed of zinc dust is very slow, and the working conditions are poor, effectively eliminating zinc dust. I could not. As a result, there is a problem that the continuous quality defects of the galvanized steel sheet by the conventional method is impossible to remove the zinc dust effectively.

The present invention is to solve the conventional problems as described above, to effectively recover and remove the zinc dust inside the snout, and to remove the zinc dust during the operation of the production line, by using a vacuum suction force to the zinc dust to the outside The object of the present invention is to provide a zinc dust removal device in a snout of a zinc plating production facility that can improve maintenance work productivity according to effective zinc dust removal and improve the surface quality of a galvanized steel sheet.

The present invention to achieve the above object,

In the device for removing the zinc dust attached to the inside of the snout of the galvanized steel sheet production equipment to the outside,

A dust collection tube extending along the inner surface of the snout to form a space in which the strip proceeds, both end portions extending outward of the snout, respectively, and having an extension opening formed on the lower surface facing the molten zinc plating solution surface;

A suction pump connected to one end of the dust collecting tube through a flexible conduit to generate a suction force; And,

A cooling water pipe extending along the rectangular structure in the dust collecting tube inside the snout and having both end portions drawn out to the outside of the snout, and having a plurality of heat dissipation fins mounted on the outer circumferential surface thereof to allow the heat transfer area to be increased; Including, the zinc dust in the snout into the dust collection tube by using a temperature difference, and the zinc dust in the snout of the zinc plating production equipment characterized in that the zinc dust to be taken out and removed to the outside as a suction pump. By.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

1 shows a zinc dust removal apparatus 1 in a snout of a galvanizing production facility according to the present invention. The zinc dust removing device 1 has a dust collecting tube 10 extending along the inner surface of the snout 353 to form a square structure in the snout 10, and the strip S is formed inside the square structure. Form a free space (P) that can pass through. In addition, the dust collecting tube 10 has both side ends 12a and 12b drawn out through the snout 353, and an opening and closing valve 15 is mounted at one side end 12a and the other end 12b. The suction pump 20 is connected to the automatic opening / closing valve 17 and the flexible conduit 19, while an opening 22 is formed in the lower surface of the dust collecting tube 10 toward the molten zinc plating solution 358. A funnel-shaped guide plate 25 is formed in the opening 22. In addition, the inside of the dust collecting tube 10, the cooling water pipe 30 is located along the square structure of the dust collecting tube 10, the heat dissipation fins for maintaining a plurality of predetermined intervals on the outer surface of the cooling water pipe (30) 32 is attached, and both end portions 31a and 31b of the cooling water pipe 30 extend laterally through the snout 353 and the cooling water flows therein.

On the other hand, the opening 22 has a predetermined interval (G) of about 20m / m, the zinc dust (D) through the guide plate 25 can enter effectively, the lower end portion 25a of the guide plate 25 ) Maintains the height H of the molten zinc plating solution 358 and approximately 30-50 mm.

In the zinc dust removing apparatus 1 of the present invention configured as described above, the strip S proceeds into the space P formed inside the rectangular structure of the dust collecting tube 10 and continuously enters into the molten zinc plating solution 358. In this case, the dust (D) due to zinc evaporation inevitably generated in the zinc plating tank 350 is like a snowflake on the heat dissipation fin 32 of the cooling water pipe 30 through the guide plate 25 of the dust collecting tube 10. Attached. This is because the operating temperature inside the snout 353 is about 460 ° C., but since the cooling water is circulated through the cooling water pipe 30 in the dust collecting tube 10, the convection phenomenon from the high temperature to the low temperature side causes the center of the guide plate 25. Zinc dust (D) is attached to the dust collecting tube (10) through the opening 22 of the. When the collection operation of the zinc dust (D) continues for a certain period of time to periodically operate the suction pump 20 connected to the dust collecting tube 10, the zinc attached to the heat sink fin 32 in the dust collecting tube 10 like a snowflake The dust (D) is taken out of the snout 353 and removed. In this series of operations, zinc dust (D) evaporating from the molten zinc plating solution 358 to the top is a convection phenomenon using a temperature difference together with zinc evaporation force, effectively into the dust collecting tube 10 through the induction plate 25. When the dust is collected and collected in the dust collecting tube 10, the dust is not attached to the inside of the snout 353 because the suction pump 20 is taken out from the dust collecting tube 10 to the outside of the snout 353. As a result, it can always be kept clean. As such, when the zinc dust D is removed by the suction pump 20, the opening / closing valve 15 of one side of the dust collecting tube 10 is opened to adjust the suction force in the dust collecting tube 10.

In addition, during the removal operation of the zinc dust (D) as described above, the strip (S) can continuously enter the molten zinc plating solution 358 in the space (P) formed by the square structure of the dust collecting tube (10). As a result, zinc dust (D) can be removed during operation.

As described above, according to the present proposal, zinc dust continuously evaporating inside the snout is effectively collected in the dust collection tube due to the evaporation power of zinc dust and convection caused by the temperature difference, and then attached to the radiating fin of the cooling water tube. As it is periodically discharged to the outside, zinc dust by zinc evaporation does not grow in the snout. Therefore, the surface quality of the strip entering the molten zinc plating solution is not deteriorated, and since zinc dust can be removed during normal operation of the equipment, maintenance workability is greatly improved.

In addition, since the effective dusting operation is made without a separate operator when the zinc dust removal work is to obtain a practical effect that prevents the worker's safety accident.

Claims (1)

In the apparatus for removing the zinc dust (D) attached to the inside of the snout (353) of the galvanized steel sheet production equipment to the outside, the space (P) is extended along the inner surface of the snout (353) (P) A dust collecting tube 10 having a square structure forming a square shape, each end of which extends to the outside of the snout 353, and an expansion opening 22 formed on each of the lower surfaces facing the molten zinc plating solution 358; A suction pump 20 connected to one end of the dust collecting tube 10 through a flexible conduit 19 to generate a suction force; And, in the dust collection tube 10 inside the snout (353) extends along the square structure, both ends are drawn out to the outside of the snout (353), the heat dissipation fin 32 for increasing the heat transfer area on the outer peripheral surface And a plurality of coolant pipes 30 mounted therein while the coolant is distributed therein. The zinc dust D in the snout 353 is collected into the dust collecting tube 10 using the temperature difference, and the suction pump 20 Zinc dust removal apparatus in the snout of the galvanizing production equipment, characterized in that withdraw the zinc dust (D) to the outside.