KR102456643B1 - Internal foreign matter removal apparatus of snout in hot dip galvanizing process - Google Patents

Abstract

The present invention relates to an apparatus for removing foreign substances from a molten metal surface in a steel sheet hot-dip galvanizing process, comprising: a snorkel part for preventing oxidation by enclosing a steel plate flowing into the hot-dip galvanizing bath with an end submerged in the molten metal surface of the hot-dip galvanizing bath; a snout including a dam unit having a dam unit wrapped so as to be spaced apart from the galvanizing bath and having a dam forming part to prevent foreign substances falling on the tang surface in the snorkel part from adhering to the steel plate by allowing the hot-dip galvanizing solution in the hot-dip galvanizing bath to overflow toward the inner peripheral surface of the snorkel part; The hot-dip galvanizing solution installed in the snorkel part, which is lower than the hot-dip galvanizing solution, so that the hot-dip galvanizing solution overflowing the dam forming part of the dam unit and foreign substances floating thereon can be discharged into the hot-dip galvanizing tank outside the snorkel part. an induction guide part located inside the dam and connected by the snorkel part and the inlet to discharge the molten zinc overflowing the dam forming part and formed with an impeller insertion hole into which the drive shaft or the impeller is inserted; a pump housing installed on the lower side of the guide part; An impeller positioned inside the pump housing and installed at the end of a drive shaft driven by a motor, and an impeller insertion hole formed in the induction guide part are blocked, and the hot-dip galvanizing solution and outside air are introduced into the pump housing through the impeller insertion hole It includes a;

Description

Internal foreign matter removal apparatus of snout in hot dip galvanizing process

The present invention relates to a device for removing foreign matter inside a snout, and more particularly, a hot-dip galvanizing process for a steel sheet capable of improving the galvanizing quality of the steel sheet by preventing foreign substances in the snorkel from adhering to the surface of the galvanized steel sheet. It relates to the internal foreign matter removal device of the snout.

In general, in the hot-dip galvanizing process, the steel sheet that has undergone the cold rolling process is heat-treated in a heating furnace to make a coil with excellent formability and plating adhesion, and then passes through a payoff reel and a welding machine continuously to remove residual stress ( annealing furnace). The heat-treated steel sheet flows into a hot-dip galvanizing bath filled with a plating solution, that is, hot-dip zinc, while being maintained at a temperature suitable for galvanizing.

The temperature of the hot-dip galvanizing bath is maintained at approximately 460°C, and the melting point of zinc is 420°C, and since zinc is always in a molten state in the hot-dip galvanizing bath, zinc fume continuously evaporates to the top.

For hot-dip galvanizing, the steel sheet is continuously supplied into the hot-dip galvanizing bath through the inside of the snout and the sink roll is wound and galvanized. After that, the plating amount is controlled by an air knife or the air It enters the alloying furnace at a location away from the knife and undergoes alloying heat treatment. And it is continuously cooled in the air cooling table and goes through the process of advancing toward the top roll.

In this process, the amount of zinc evaporation measured inside the snout varies depending on the size of the hot-dip galvanizing bath, but in the case of the hot-dip galvanizing bath for plating coiled steel sheets, it is known that a fairly large amount of evaporation occurs, about 1-2 liters per hour. have.

Ash (hereinafter, referred to as 'foreign substance'), which is such a zinc vapor, is attached to the inner surface of the snout by spreading to the upper part of the snout, and falls to the molten surface in the snout by its own weight. Ash that has fallen to the hot water surface, that is, foreign substances, are attached to the surface of the plated steel sheet while floating or form intermittent or continuous bands in the steel sheet moving direction, thereby degrading the galvanizing quality of the steel sheet.

In consideration of this problem, the tip of the snout is immersed in a hot-dip galvanizing tank, a dam having a rectangular height is installed inside the tip along the edge of the steel plate, and a suction pipe is installed between the main wall of the dam and the main wall of the end of the snout. It is provided and is connected to a metal pump mounted on the side of the snout so that foreign substances generated when the steel sheet enters the hot-dip galvanizing tank can be discharged to the outside of the dam.

Korean Patent Registration No. 1806078 discloses a metal pump of Snout, and Korean Patent Registration No. 1842168 discloses a dross removal device for galvanizing lines.

The posted snout metal pump includes a housing provided with a discharge pipe at the bottom of the snout; A motor is installed at the open upper end of the housing and coupled to seal the inside of the housing, a screw rotating shaft is connected to a driving shaft of the motor inside the housing, and a screw is installed at the end of the screw rotating shaft to provide a screw bundle disposed in the discharge pipe .

The conventional metal pump configured as described above has a problem in that the outside air flows in because the housing is exposed to the upper side of the molten metal. It increases the occurrence of the same foreign material.

In consideration of this point, the inventor of the present application applied for a device for removing foreign substances from the inside of the snout and was registered as Korean Patent Registration No. 0831061.

And Korean Patent No. 10-1353197 discloses a snout device for a steel plate plating line. The published snout device is a snout body connected between a heating furnace and a plating bath filled with a plating solution and a plated steel sheet passes therein, and a snout body on both sides with respect to the plated steel sheet at the end of the plating bath side of the snout body. and a first dam device and a second dam device installed independently of each other, and a metal pump movably installed at a position adjacent to the first dam device and the second dam device outside the snout body.

Since a part of such a metal pump is exposed to the hot water surface, the conventional problems as described above cannot be fundamentally solved. In particular, when the plating solution overflows the first and second dam devices and is pumped by the metal pump, suction power (vacuum) is continuously generated inside the pump room and the water level of the plating solution is lowered, the connection part connecting the pump room and the dam device is opened. . Then, the outside air flows back into the snout through the pump room through the gap of the impeller shaft exposed on the hot water surface by the suction force of the pump room to oxidize the steel sheet, or a large amount of zinc vapor flows into the snout, causing fatal defects on the steel sheet surface. cause to cause In addition, there is a problem in that some of the introduced outside air is pumped into the hot-dip galvanizing bath together with the plating solution, causing oxidation of the molten metal and contamination by foreign substances contained in microbubbles.

Republic of Korea Patent Registration 10-1482319 Republic of Korea Patent Registration 10-1403921 Republic of Korea Patent Registration 10-1461739 Republic of Korea Patent Registration No. 10-1353197

The present invention is to solve the conventional problems as described above, and during the hot-dip galvanizing process, foreign substances floating on the molten metal surface in the snout are moved to the steel sheet in the snout and attached to the steel sheet melting. An object of the present invention is to provide a device for removing foreign matter inside the snout in the galvanizing process.

Another object of the present invention is to prevent oxidation and contamination of a steel sheet caused by outside air flowing into the snout by the hot-dip galvanizing unit, and to prevent oxidation of the molten metal by flowing into the hot-dip galvanizing bath, and hot-dip galvanizing solution An object of the present invention is to provide an internal foreign material removal device for a snout in a steel sheet hot-dip galvanizing process that can prevent foreign substances around the bubbles introduced together with the plating tank from contaminating the plating tank.

In order to achieve the above object, the device for removing foreign matter inside the snout in the hot-dip galvanizing process of the present invention has an end immersed in the molten metal surface of the hot-dip galvanizing bath to wrap the steel sheet flowing into the hot-dip galvanizing bath to prevent oxidation. The snorkel part and the snorkel part are wrapped so as to be spaced apart from the steel plate by a predetermined distance from the end of the snorkel part, and the hot-dip galvanizing solution in the hot-dip galvanizing bath overflows to the inner circumferential side of the snorkel part to prevent foreign substances falling on the hot water surface in the snorkel part from adhering to the steel plate. a snout including a dam unit having a portion;

It is installed in the snorkel part, and is installed in the molten metal lower than the molten metal surface so that the hot-dip galvanizing solution overflowing the dam forming part of the dam unit and foreign substances floating thereon can be discharged into the hot-dip galvanizing tank outside the snorkel part. an induction guide portion positioned and connected by the snorkel portion and the inlet to discharge the molten zinc overflowing the dam forming portion and formed with an impeller inlet into which the drive shaft or the impeller is inserted; a pump housing installed on the lower side of the guide part;

An impeller positioned inside the pump housing and installed at the end of a drive shaft driven by a motor, and an impeller insertion hole formed in the induction guide part are blocked, and the hot-dip galvanizing solution and outside air are introduced into the pump housing through the impeller insertion hole It is characterized in that it includes; a molten zinc discharge unit having an external inflow control plate to block the inflow.

In the present invention, the external inflow control plate is formed with a through hole into which the drive shaft is inserted in the central portion so as to block the impeller insertion port of the pump housing and blocks the impeller insertion port, and on the lower surface it further includes a position coupling unit coupled to the pump housing .

A vortex preventing member for preventing oxidation and erosion of the hot-dip galvanizing solution and the drive shaft by generating a vortex by the rotation of the drive shaft and the impeller on the drive shaft on the upper side of the external inflow control plate is installed.

It may be fixedly installed on the drive shaft of the external inflow control plate, the upper surface of the induction guide portion for discharging the gas in the guide guide to the outside, the outlet is further provided with a gas discharge member located inside the molten metal.

In order to achieve the above object, the device for removing foreign substances inside the snout in the hot-dip galvanizing process includes a snorkel part for preventing oxidation by enclosing the steel sheet flowing into the hot-dip galvanizing bath with an end submerged in the molten metal surface of the hot-dip galvanizing bath; A dam unit having a dam forming part wrapped around the end of the snorkel part so as to be spaced apart from the steel plate by a predetermined distance and allowing the hot-dip galvanizing solution in the hot-dip galvanizing tank to overflow to the inner circumferential side of the snorkel part to prevent foreign substances falling on the hot water surface in the snorkel part from adhering to the steel plate. Snout including;

It is installed in the snorkel part and pumps the hot-dip galvanizing solution overflowing the dam forming part of the dam unit into the hot-dip galvanizing tank outside the snorkel part, so that foreign substances contained in the hot-dip galvanizing solution overflowing the dam forming part are the hot-dip galvanizing solution. It is located inside the molten metal lower than the molten metal to be pumped into the inside of the dam, and the snorkel part and the inlet are connected to discharge the molten zinc overflowing the dam forming part. Wow;

a pump housing installed in a through hole formed on the lower side of the guide part;

Discharge of molten zinc comprising a pump including a support member supported by the pump housing, a motor installed at an end of the support member, and an impeller installed at an end of a drive shaft rotated by the motor and installed inside the housing unit; including

The device for removing foreign substances inside the snout in the hot-dip galvanizing process according to the present invention pumps the hot-dip galvanizing solution and foreign substances flowing into the snorkel part to the molten metal of the snorkel part hot-dip galvanizing tank, and external air is supplied to the inside and outside of the snout through the impeller bearing part. It can prevent inflow into the plating bath.

In addition, the apparatus for removing foreign substances from the molten metal in the hot-dip galvanizing process of the steel sheet according to the present invention enables the impeller to be coupled and separated through the impeller insertion hole formed on the upper part of the induction guide, so that the maintenance and repair of the molten zinc discharging unit is easy. In addition, it is possible to prevent a vortex from being generated at the contact portion between the driving shaft and the molten metal due to the rotation of the driving shaft, and it is possible to prevent the hot-dip galvanizing solution from rising along the driving shaft.

1 is a side cross-sectional view showing an internal foreign material removal device of a snout in a steel sheet hot-dip galvanizing process according to an embodiment of the present invention;
Figure 2 is a cross-sectional view of the molten metal surface foreign material removal device in the steel sheet hot-dip galvanizing process shown in Figure 1;
3 and 4 are cross-sectional views showing an extract of the molten zinc discharge unit shown in FIGS. 1 and 2;
5 is a cross-sectional view showing another embodiment of the molten zinc discharge unit according to the present invention;
6 to 9 are cross-sectional views showing various embodiments of the molten zinc induced discharge unit for changing the discharge direction discharged through the discharge unit of the molten zinc discharge unit;
10 is a cross-sectional view showing another embodiment of the molten zinc discharge unit;
11 to 13 are cross-sectional views showing various embodiments of the external inflow control plate of the molten zinc discharge unit installed on the drive shaft;
14 is a cross-sectional view showing another embodiment of the anti-vortex member of the present invention,
Figure 15 is a side cross-sectional view showing another embodiment of the internal foreign matter removal device of the snout in the steel sheet hot-dip galvanizing process according to the present invention.
16 to 18 are cross-sectional views showing still other embodiments of the apparatus for removing foreign matter inside the snout in the hot-dip galvanizing process for steel sheet according to the present invention.

Examples of the apparatus for removing foreign matter inside the snout in the hot-dip galvanizing process for steel sheet according to the present invention are shown in FIGS. 1 to 5 .

Referring to the drawings, the device for removing foreign matter inside the snout in the hot-dip galvanizing process according to the present invention is installed in the hot-dip galvanizing tank 150 and the steel sheet 200 heat-treated at a high temperature is exposed to the atmosphere. Prevents surface oxidation. In addition, it has a structure to prevent ash formed by condensing the vapor of the hot-dip galvanizing solution from being attached as a foreign material to the surface of the steel sheet 200 to prevent surface defects.

In this steel sheet hot-dip galvanizing process, the internal foreign material removal device 10 of the snout has an end submerged in the hot water surface 1 of the hot-dip galvanizing bath 150 and the steel sheet 200 flowing into the hot-dip galvanizing bath 150. Provided with a snout 40 for preventing oxidation by wrapping. The snout 40 is formed, and a snorkel part 20 is provided on the lower side of the snout, the lower end of which is immersed in the hot-dip galvanizing tank 150 . The snorkel part 20 is extended inwardly upward so as to be adjacent to the outer peripheral surface of the steel plate 200 passing through the snorkel part 20 from its lower end to prevent foreign substances falling on the hot water surface in the snorkel part 20 from adhering to the steel plate. It includes a dam unit (30).

Then, the hot-dip galvanizing solution installed in the snorkel unit 20 and overflowing the dam forming unit 32 of the dam unit 30 is pumped into the hot-dip galvanizing tank 150 to float inside the snorkel unit 20 . A molten zinc discharge unit 50 is provided to prevent foreign substances from adhering to the steel sheet.

The internal foreign matter removal device 10 of the snout in the hot-dip galvanizing process according to the present invention configured as described above will be described in detail for each component as follows.

The snorkel part 20 constituting the snout 40 is installed on the side of the hot-dip galvanizing tank 150 between the heat treatment furnace (not shown) and the hot-dip galvanizing tank 150 and heated for heat treatment ( 200 ) has a structure surrounding the steel sheet 200 guided by rollers and introduced into the hot-dip galvanizing bath 150 to prevent oxidation.

The snout 40 may be formed by combining unit members in the shape of a square tube and the snorkel unit 20 . In addition, the snout 40 may further include a separate actuator (not shown) that rotates a part of the snorkel part 20 at the end to be submerged or lifted in the hot-dip galvanizing bath 150 .

The dam unit 30 may be integrally formed with the snorkel unit 20 or may be separately manufactured and combined. As shown in FIGS. 1 and 2, the dam unit 30 passes through the inside of the snorkel unit 20, that is, the steel sheet introduced into the hot-dip galvanizing bath 150 through the inner space of the snorkel unit 20. A storage space of molten zinc overflowing through the steel plate inlet 31 by connecting the dam forming part 32 forming the steel plate inlet 31 and the lower end of the dam forming part 32 and the lower end of the snorkel part 20 A chamber forming part (33) forming a (34) is provided.

The upper end of the dam forming part 32 of the dam unit 30 has the same height as the hot water surface 1 in the snorkel part 20 while the snorkel part 20 is immersed in the hot-dip galvanizing tank 150, or located in a relatively low position.

Therefore, the molten hot-dip galvanizing solution 2 in the hot-dip galvanizing tank 150 flows in through the steel plate inlet 31 through which the steel plate 200 passes, overflows the dam forming part 32, and the chamber forming part 33. is stored in the storage space 34 formed by

The dam unit 30 is not limited by the above-described embodiment, and the floating matter or foreign material including the ash in the snorkel part 20 is attached to the surface of the steel plate 200 through the steel plate inlet 31 . It is possible if the structure is such that the hot-dip galvanizing solution passing through the steel plate inlet 31 can flow in a direction away from the surface of the steel plate 200 to be plated.

For example, the dam forming portion may be formed in an independent rectangular shape in the central portion of the snorkel portion or may be formed parallel to the front and rear surfaces of the steel plate. At least one induction discharge groove (32a) on the upper end side of the dam forming part (32) so that foreign substances riding on the hot-dip galvanizing solution (2) flowing in through the steel plate inlet (31) can be smoothly discharged into the storage space (32a) can be formed (see Fig. 5).

The molten zinc discharging unit 50 overflows the dam forming part 32 of the dam unit 30 and snorkels the molten zinc plating solution 2 stored in the storage space 34 formed by the chamber forming part 33 . The hot-dip galvanizing solution 2 in the hot-dip galvanizing bath 150 is discharged into the hot-dip galvanizing bath 150 outside the part 20 so that the hot-dip galvanizing solution 2 can be continuously introduced through the steel plate inlet 31 .

At least one inlet part 51 for discharging the molten zinc stored in the storage space 34 by overflowing the dam forming part 32 of the dam unit 30 is formed, and is connected to the induction guide part 55 . The guide part 55 is installed in the snorkel part 20 , has an internal space 56 , and is installed to be located inside the molten metal at a predetermined depth from the molten metal surface 1 . The guide part 55 is installed in the snorkel part 20 at a position lower than the height of the upper surface of the dam forming part 32 of the dam unit 30 . This is to block the inflow of external air through the impeller insertion hole 52 of the induction guide part 55 .

An impeller insertion hole 52 into which the drive shaft 63 or the impeller 64 is inserted is formed on the upper surface of the induction guide part 55 as described above, and the pump housing 61 is formed on the lower surface of the induction guide part 55 . is installed The impeller insert 52 may have the same diameter or a larger diameter as the pump housing 61 , and the impeller insert 52 may have a larger diameter than the drive shaft 63 , but limited thereto. it doesn't happen In addition, the discharge portion 61a of the pump housing 61 may be formed in a cylindrical shape substantially the same as the diameter of the impeller insertion hole 52, but is not limited thereto. And it is preferable that the impeller 64 installed in the pump housing 61 be installed at a position relatively lower than the height of the upper end of the inlet part 51 .

As shown in FIGS. 6 to 9, the hot-dip galvanizing solution 2 discharged from the outlet 61a of the pump housing 61 is applied to the discharge part 61a of the pump housing 61 in a hot-dip galvanizing bath ( 150) may further include molten zinc induction discharge portions 69a, 69b, 69c, and 69d for guiding to the side or the molten metal surface side.

As shown in FIG. 10, an opening 61b in the form of a semicircle, square, or rhombus is formed on the outer peripheral surface of the end side of the discharge port 61a of the pump housing 61 to diversify the discharge direction of the hot-dip galvanizing solution 2 and can reduce the discharge resistance.

And the impeller 64 is located inside the pump housing 61 through the impeller insertion hole 52 and installed on the drive shaft 63 driven by the motor 62 installed on the side of the snout. At the upper portion of the induction guide portion 55, the impeller insertion hole 52 is blocked, and the outside air and the molten galvanizing solution 2 on the outside of the snout are supplied through the impeller insertion hole 52 inside the guide guide portion 55. An external inflow control plate 66 is installed to block the inflow into the space 56 and the pump housing 61 . The motor 62 for rotating the drive shaft 63 may be installed on the support members 62a installed on the snorkel part 20 or the external inflow control plate 66 or the upper surface of the induction guide part 55 .

On the other hand, in the molten zinc discharging unit 50 configured as described above, the inner space 56 of the induction guide part 55 installed inside the molten metal of the hot-dip galvanizing bath 150 is the impeller insertion port 52 . The hot-dip galvanizing solution (2) that is introduced through the inlet part (51) connecting the storage space (34) of the dam unit (30) is prevented from being introduced into the snout (40). It is preferable to allow the bubbles contained in the to flow to the upper side so that they can be collected. In particular, since the discharge rate of the hot-dip galvanizing solution discharged through the inlet part 51 is high, the water level of the hot-dip galvanizing solution 2 in the storage space 34 is lowered, so that the bubbles flowing into the inlet part 51 are induced. It is preferable to flow to the upper part of the inner space 56 of the guide part 55 and to be collected. This is preferable.

And on the upper surface side of the guide part 55, a tubular gas exhaust unit 57 for discharging the air collected in the inner space of the guide part 55 to the inside of the hot-dip galvanizing or the outside of the hot water surface is further provided. .

As shown in FIG. 3, the gas discharge unit 57 discharges the air collected in the inner space of the induction guide portion 55 on the upper surface side of the guide guide portion 55 to the inside of the hot-dip galvanizing or to the outside of the hot water surface. It may be made of a gas discharge pipe (57a) for discharging.

As shown in FIGS. 4 and 5 , the inlet 51 is another type of induction discharge pipe connecting the lower surface of the chamber forming part 33 of the dam unit 30 and the side or lower surface of the induction guide part 55 . (58) may also be used. The inlet portion 51 connecting the induction guide portion 55 and the storage space 34 of the dam unit 30 may have a structure connecting the chamber forming portion 33 and the lower surface of the induction guide portion 55 . have.

The external inflow control plate 66 has a through hole 66a into which the drive shaft 63 is inserted in the central portion so as to block the impeller insertion hole 52 of the induction guide part 55, and to block the impeller insertion hole 52. It has a larger diameter than the diameter of the impeller insertion hole (52) to be able to. And on the lower surface of the external inflow control plate 66 and the upper surface of the induction guide part 55, at least one position coupling part 67 for limiting a position coupled to the induction guide part 55 may be further provided. have. The position coupling portion 67 has at least one position coupling protrusion 67a formed on the lower surface of the external inflow control plate 66, and is coupled to the position coupling protrusion 67a on the upper surface of the guide part 55 A position coupling groove (67b) is formed. In addition, the shape of the external inflow control plate 66 can be applied in various shapes such as a plate shape, a rhombus, a triangle.

The external inflow control plate 66 may be installed on the drive shaft 63 and rotated together with the drive shaft 63 as shown in FIGS. 11 to 13 . In this case, it is shown in FIG. 12 to prevent the hot-dip galvanizing solution 2 in the hot-dip galvanizing bath 150 from flowing into the impeller insertion hole 52 of the induction guide part 55 through the impeller insertion hole 52. As described above, the edge of the impeller insertion hole 52 or the edge of the external inflow control plate 66 may be formed with skirt portions 52b and 66b of a predetermined width.

On the other hand, while the molten galvanizing solution 2 is pumped to the upper driving shaft 63 of the external inflow control plate 66 by the rotation of the driving shaft 63 and the impeller 64, the eddy is prevented from being generated and the vortex is generated. A vortex prevention member 70 for preventing the inflow of air bubbles into the inner space 56 of the outside air guide portion 55 and oxidation and erosion of the drive shaft 63 is further provided. The vortex prevention member 70 may be formed of a tube type, a disk type, a truncated cone type, etc. fitted to the drive shaft 63, but is not limited thereto and has a structure capable of preventing the occurrence of a vortex. For example, as shown in FIG. 14 , the cylindrical cover 75 supported by the motor 62 surrounds the drive shaft 63 and the end thereof may be submerged in the hot water surface or may be configured to be slightly spaced apart from the hot water surface. In addition, although not shown in the drawing, an inert gas such as nitrogen may be supplied to the inside of the cover 75 . In addition, the anti-vortex member 70 and the cover 75 may be made of a material such as carbon or ceramic to which molten zinc is not attached.

Another embodiment of the molten zinc discharging unit 50 is shown in FIG. 15 . In the above embodiments, the same reference numerals as in other embodiments indicate the same components.

The induction guide part 55 pumps the hot-dip galvanizing solution 2 overflowing the dam forming part 32 of the dam unit 30 into the hot-dip galvanizing tank 150 outside the snorkel part 20 to form a dam. It is located inside the molten metal lower than the hot-dip galvanizing bath 150 so that foreign substances contained in the hot-dip galvanizing solution overflowing the part 32 can be pumped into the hot-dip galvanizing bath 150, and the dam unit 30 is stored. It is connected by the space 34 and the inlet 51 .

A support hole 91 is formed on the lower surface of the guide part 55 . And the induction guide part 55, the external inflow control plate 66 and the pump housing 92 is installed in the motor 62, the drive shaft 63, and the impeller 64 and the integrally configured pump (90).

The pump housing 92 of the pump 90 has a cylindrical shape, and a flange part 93 is formed thereon to be supported on the edge of the support hole 91 . A support member 94 is installed on the flange portion 93 of the pump housing 92 . The support member 94 extends to the upper portion of the hot water surface through the impeller insertion hole 52 formed on the upper surface of the guide part 55 to support the motor 62 . And the external inflow control plate 66 is supported on the support member 94 . An impeller 64 installed inside the pump housing 92 is installed at an end of the drive shaft 63 rotated by the motor 62 .

On the other hand, in the above embodiments, the inlet portion 51 connecting the guide portion 55 is located at a lower position than the upper end of the dam forming portion (32). In addition, the drive shaft 63 and the rotation shaft of the motor 62 are connected by a coupler 97, in the coupler 97 to prevent heat from the drive shaft 63 from being transmitted to the rotation shaft of the motor 62. Insulation material 98 for may be installed.

16 to 18 show another embodiment of the apparatus for removing foreign matter inside the snout in the hot-dip galvanizing process for steel sheet according to the present invention. In this embodiment, the same reference numerals as in the above embodiment indicate the same components.

The induction guide part 55 of the foreign matter removal device according to this embodiment applies the hot-dip galvanizing solution 2 overflowing the dam forming part 32 of the dam unit 30 to the outer side of the snorkel part 20 by hot-dip galvanizing. It is located inside the molten metal lower than the molten metal surface so that foreign substances contained in the hot-dip galvanizing solution pumped into the tank 150 and overflowed the dam forming part 32 can be pumped into the hot-dip galvanizing tank 150 , and the dam unit It is connected by the storage space 34 of the 30 and the inlet part 51 .

A pump housing 61 is formed on the lower surface of the induction guide part 55 , and is located in the pump housing 61 at the end of the drive shaft 63 rotated by the motor 62 through the inlet part 51 . An impeller 64 for discharging the hot-dip galvanizing solution 2 flowing into the induction guide part 55 through the discharge part 61a is installed.

And the impeller insertion port 52 corresponding to the pump housing 61 is provided with an upper pumping part 80 for discharging the molten infant feeding solution 2 flowing in through the induction guide part 55 to the upper part. An upper pump housing 81 is installed on the upper surface of the induction guide part 55 corresponding to the pump housing 61 to constitute the upper pumping part 80 . The upper pump housing 81 has a cylindrical shape, and a support flange 82 is formed on the upper end in a radial direction. 16, the diameter of the pump housing 61 and the diameter of the upper pump housing 81 are formed to have the same diameter. In addition, an upper impeller 83 rotated by the drive shaft 63 is installed in the upper pump housing 81 to apply the hot-dip galvanizing solution 2 in the induction guide part 55 to the hot-dip galvanizing bath 150 . It is pumped to the hot water surface (1) side. And the upper impeller 83 and the impeller 64 are fixed to the same drive shaft 63 and rotate at the same time, but the discharge direction of the impellers may be configured differently to discharge in different directions, but is not limited thereto.

On the other hand, as shown in FIG. 17 , the upper impeller 83 makes the diameters of the upper pump housing 81 and the upper impeller 83 smaller than the diameters of the pump housing 61 and the impeller 64, so that the The hot-dip galvanizing solution in the unit may be mainly discharged through the discharge port 61a of the pump housing 61 .

In addition, as shown in FIG. 18 , the diameters of the upper pump housing 81 and the upper impeller 83 are larger than the diameters of the pump housing 61 and the impeller 64 positioned on the lower side of the induction guide part 55 . Thus, the hot-dip galvanizing solution in the induction guide part can be mainly discharged through the upper pumping part 80 .

The operation of the internal foreign material removal device of the snout in the hot-dip galvanizing process according to the present invention configured as described above will be described as follows.

First, as shown in FIGS. 1 and 5 , the lower part of the snorkel part 20 is placed in the molten metal of the hot-dip galvanizing bath 150 so that the end of the snorkel part 20 is located at a position lower than the water level of the hot water surface 1 . When partially immersed, the hot-dip galvanizing solution 2 in the hot-dip galvanizing tank 150 overflows the dam forming unit 32 and is stored in the storage space 34 partitioned by the chamber forming unit 33 . At this time, the pump housing 61 in which the induction guide part 55 and the impeller 64 formed in the snorkel part 20 are installed is the molten galvanized degree drawn in from the hot water surface 1 of the hot-dip galvanizing tank 150 to a predetermined depth. It is locked in the amount (2).

In this state, when the motor 62 of the molten zinc discharging unit 50 is operated, the impeller 64 is rotated and the hot-dip galvanizing solution 2 in the storage space 34 is transferred to the inner space of the induction guide part 55 . After flowing into the pump housing 61, the hot-dip galvanizing solution in the hot-dip galvanizing tank 150 is 2) is discharged.

In this process, the hot-dip galvanizing solution 2 flowing into the storage space 34 after being introduced through the steel plate inlet 31 of the dam unit 30 is the gas containing the ash inside the snout and the inlet 51. It may be introduced into the inner space 56 of the induction guide portion 55 through.

As described above, the gas (bubbles) contained in the hot-dip galvanizing solution 2 introduced into the inner space of the induction guide part 55 is separated and moved upward, and the hot-dip galvanizing solution 2 is discharged from the discharge part 61a. is emitted through Accordingly, it is possible to prevent the gas inside the snout from riding on the hot-dip galvanizing solution 2 pumped by the impeller and flowing out into the molten metal in the hot-dip galvanizing tank 150 , that is, the hot-dip galvanizing solution.

And the induction guide portion 55 is configured to be submerged in the hot water surface and the swirl prevention member 70 is provided, so that the inflow of outside air is fundamentally prevented, but if it is introduced through the impeller insertion hole 52 or the through hole 66a The external gas that can be formed is discharged toward the hot water surface 1 through the tubular gas discharge member 57 located on the upper portion of the inner space of the induction guide portion 55 . Accordingly, oxidation of the steel sheet or the hot-dip galvanizing solution can be prevented by air, that is, bubbles riding on the pumped hot-dip galvanizing solution 2 as described above, and these bubbles are introduced into the snorkel unit 20 for plating. It can be prevented from being attached to the surface of the steel plate 200 to be used and causing defects.

In particular, as shown in FIG. 14 , a vortex prevention member 70 is installed on the drive shaft 63 at the portion in contact with the hot water surface, so that a part of the hot-dip galvanizing solution 2 passes through the through hole 66a to the guide part. In addition to blocking the inflow into the inner space (56) of the 55, it is possible to prevent the occurrence of a vortex phenomenon due to the rotation of the drive shaft (63). In addition, it is possible to prevent the hot-dip galvanizing solution 2 from rising along the drive shaft 63 .

In order to repair the molten zinc discharge unit 50, the pump housing 61 and the induction guide portion 55 are not separated from the snorkel portion 20, and the motor 55, the support member and the external inflow control plate 66 are removed. It is possible to separate the impeller inserted into the pump housing 61 like the drive shaft through the impeller insertion hole 52 by separation. Therefore, maintenance of the molten zinc discharge unit is easy.

On the other hand, as shown in FIGS. 16 to 18, the upper pumping part 80 is formed on the upper surface side of the induction guide part 55, and the pump housing 61 and the impeller 64 for discharging the lower part are the driving shafts. Since the galvanizing solution 2 introduced into the induction guide part 55 through the inflow part 51 is discharged to the upper and lower sides of the induction guide part 55 because it is installed in the guiding part (63). Accordingly, it is possible to improve the discharge characteristics of the hot-dip galvanizing solution 2 in the induction guide part 55 , and to fundamentally prevent the inflow of external air from the upper surface side of the induction guide part 55 to the inner space 56 . .

As described above, in the device for removing foreign matter inside the snout in the hot-dip galvanizing process of the present invention, when the hot-dip galvanizing solution flowing into the storage space of the dam unit by the hot-dip galvanizing discharge unit is pumped, the existing impeller shaft side The occurrence of defects in the steel sheet due to the inflow of the outside air into the snout, which is generated by being configured to communicate with the outside air, and the outside air in the form of air bubbles flowing into the hot-dip galvanizing bath 150 together with the hot-dip galvanizing solution and oxidation of the plating solution It is possible to prevent foreign substances contained in the surrounding air bubbles from adhering to the surface of the plated steel sheet and causing defects.

Although the device for removing foreign matter inside the snout in the hot-dip galvanizing process according to the present invention described above has been described with reference to the accompanying drawings, this is only an example, and those of ordinary skill in the art can It will be understood that various modifications and equivalent other embodiments are possible.

Accordingly, the scope of true technical protection of the present invention should be defined only by the technical spirit of the appended claims.

Claims (4)

delete The end of the snorkel part 20 is immersed in the hot water surface of the hot-dip galvanizing bath 150 and surrounds the steel plate 200 flowing into the hot-dip galvanizing bath to prevent oxidation; Dam having a dam forming part 32 that wraps around the hot-dip galvanizing bath so that the hot-dip galvanizing solution overflows to the inner circumferential side of the snorkel part 20 to prevent foreign substances falling on the hot water surface 1 in the snorkel part from adhering to the steel plate a snout 40 comprising a unit 30 ;
It is installed in the snorkel part 20, and is connected by the dam unit 30 and the inlet 51 to discharge the molten zinc overflowing the dam forming part 32, and the drive shaft 63 or An induction guide portion 55 having an impeller insertion hole 52 into which the impeller 64 is inserted, and the impeller insertion hole is set to be located inside the molten metal at a predetermined depth from the molten metal surface 1 of the hot-dip galvanizing bath 150 guide portion 55;
a pump housing (61) installed on the lower side of the induction guide part (55) and having a discharge part (61a) through which the hot-dip galvanizing solution is discharged;
an impeller (64) located inside the pump housing (61) and installed at an end of a drive shaft (63) driven by a motor (62); and
and an upper pumping part (80) installed in the impeller insertion port (52) of the induction guide part (55) to discharge the molten galvanizing solution in the induction guide part (55) to the upper part;
The upper pumping unit 80,
An upper pump housing 81 installed on the upper side of the induction guide part 55 corresponding to the pump housing 61, and
An apparatus for removing foreign matter inside a snout in a steel sheet hot-dip galvanizing process, characterized in that it is fixed to the drive shaft (63) and includes an upper impeller (83) installed inside the upper pump housing (81). 3. The method of claim 2,
The internal foreign material removal device of the snout in the hot-dip galvanizing process, characterized in that the diameter of the upper impeller (83) is larger or smaller than the diameter of the impeller (64). 3. The method of claim 2,
The upper impeller 83 and the impeller 64 are installed on the same drive shaft 63, and the discharging directions of the respective impellers are opposite to each other. .

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