KR20140130865A - Apparatus for manufacturing galvanized steel-sheet and monitoring equipment for manufacturing galvanized steel-sheet - Google Patents

Abstract

The present invention provides an apparatus for manufacturing a hot-dip galvanized steel sheet. The apparatus includes: a container part which stores molten steel and forms a pathway in which a strip, entering from the outside, is impregnated; and an ingot supplying part which is arranged on an upper part of the container part, melts the ingot supplied from the outside, and supplies the molten ingot to the inside of the container part so as to maintain a level of the molten steel in the container part to be a predetermined reference level.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot-dip galvanized steel sheet manufacturing apparatus and a hot-dip galvanized steel sheet manufacturing apparatus,

More particularly, the present invention relates to a hot-dip galvanized steel sheet manufacturing apparatus and a hot-dip galvanized steel sheet manufacturing and monitoring apparatus for a shell, which are excellent in surface quality.

Generally, it is an important factor in the hot dip galvanized steel sheet used for automotive shell plating to exclude surface foreign matter from passing through the hot dip galvanizing bath.

Generally, as the zinc plating operation proceeds, zinc in the hot dip galvanizing bath is consumed and new zinc should be supplied.

This zinc supply is carried out through the ingot charging device. When the charging is performed at a room temperature of about 1 to 2 tons, the peripheral temperature of the zinc is lowered to 465 degrees, which is the bath temperature.

In addition, when the ingot having a weight of 1 ton or more is sedimented in a bath at one time, shaking occurs in the bath surface, and the effect thereof is caused by the swelling of the bath surface in the inside of Snooth which is immersed in the plating bath, Foreign matter such as foreign matter is mixed on the surface of the strip and causes surface defects.

Generally, in the bath, Bottom Dross (FeZn7) formed by combining Fe and Zn eluted from the strip continuously charged for plating, and Floating Dross (Fe2Al5) formed by combining Fe with Fe dissolved in the bath additive element Is present in a sedimented or floating state.

This droplet is adhered to the surface of the strip by the flow in the bath, and when the steel sheet is subsequently press-formed, it causes a problem such as a flaw or a damage of a die. Therefore, it is necessary to prevent dross from occurring in the bath.

The reason why dross is formed is caused by the phenomenon that excess Fe precipitates into the bath when Fe or Al exists in a concentration higher than the solubility in the bath.

Generally, the solubility is a problem in the case where the bath temperature is low, that is, when the ingot is charged, the bath temperature around the ingot supply is greatly lowered and an environment in which the generation of dross can not be avoided is produced, .

In addition, in the case of manufacturing GI and GA steel plates for shell plating, in order to prevent surface defects caused by the swelling of the bath surface at the time of ingot charging, it is necessary to control the ingot loading speed very slowly or to control the filling technology of the ingot by several steps .

In recent years, in the outer plate material manufacturing line, a tendency to operate a pre-melting pot in which a zinc ingot is melted in advance and supplied to the main bath in a molten zinc state in order to improve the peripheral bath temperature and to improve the bath surface dislocation during the ingot charging Is increasing.

However, in such a case, securing a facility space for operating a separate plating bath and increasing the investment cost are obstacles to be applied to all the plating lines. Especially, in case of producing the outer plate material in the installed plating line, There is a problem in that it is impossible to apply the preliminary bathtub to minimize the occurrence of the loss when the installation space is secured.

 Therefore, in order to mass-produce GI and GA products for automotive exterior sheathing with excellent surface quality, research on ingot charging technology that does not cause bath temperature drop while minimizing the fluctuation of the melt level is required.

Prior art related to the present invention is Korean Patent Laid-Open No. 10-2011-0053849 (published on May 24, 2011), which discloses a continuous hot dip galvanizing bath Technology is disclosed.

An object of the present invention is to provide a hot-dip galvanized steel sheet manufacturing apparatus and a hot-dip galvanized steel sheet production monitoring apparatus capable of effectively preventing suspended matter of a molten metal from being mixed into a strip.

It is another object of the present invention to provide a hot dip galvanized steel sheet manufacturing apparatus and hot dip galvanized steel sheet manufacturing apparatus capable of preventing the temperature of the molten metal from being varied rapidly due to ingot charging, Monitoring facilities.

In a preferred embodiment of the present invention, the present invention provides a method for producing a molten metal, comprising: a container for storing a melt to be melted and forming a path through which a strip introduced from the outside is impregnated; And an ingot supply unit disposed on the upper portion of the container unit for heating and melting a gap supplied from the outside so as to maintain a reference level at which the level of the melt in the container unit is preset to supply the molten zinc plated steel sheet to the inside of the container unit. Thereby providing a manufacturing apparatus.

The container unit includes a plating tank in which a predetermined amount of the molten metal is stored and an upper part is opened, a strip inflow member disposed on the plating tank, introducing the strip into the inside of the molten metal, And a strip moving member disposed inside the plating tank and having a plurality of rollers for impregnating and impregnating the strip drawn out from the strip inflow member into the upper portion of the plating bath.

Wherein the ingot supply unit includes an ingot placing unit disposed on the plating vessel and gripping the goblet and forming a descending path for descending the ingot gripped by receiving power from the outside toward the inside of the plating vessel, A heater disposed at a lower portion of the charging unit and disposed to surround the lowering path of the ingot to be lowered and heating and dissolving the ingot lowered along the lowering path; A molten metal level meter for measuring the level of the molten metal to be stored; an ingot moving mechanism for moving the ingot along the downward path using the ingot inserting machine so that the level of the molten metal measured forms a predetermined reference level; And a controller for dissolving the ingot to supply the ingot to the inside of the plating bath.

The heater includes a heater body formed of a refractory material to form a heating space that opens upward and downward to surround the descending path of the ingot, an ingot formed at a distance from the heater body and moved along the descending path, It is preferable to have a plurality of heaters which are heated to a predetermined temperature.

It is preferable that the plurality of heaters are any one of a gas burner type in which air and gas are supplied from the outside and heated to heat the ingot or an induction heating system.

The heater further includes a molten metal guide portion for guiding the supply of the molten metal.

Wherein the molten metal guide portion includes a vertical partition wall extending along a lower portion of the heater body so as to be positioned in the interior of the contractor at a periphery of the heater body, And a plurality of separators for supplying the plating solution through the guide holes at different positions into the plating vessel.

The size of the guide holes may be different.

It is preferable that the plurality of separators is formed with a gradient downward.

And a shielding plate is further provided at a lower end of the vertical partition wall spaced apart from the inner wall of the plating vessel to have a predetermined length along the vertical direction so as to be positioned inside the plating vessel.

The ingot supply unit includes an ingot charging sensor.

The ingot charging sensor detects the presence of the ingot moved along the descending path and transmits a signal indicating whether or not the ingot exists to the controller,

The controller preferably stops driving the heater when receiving a signal indicating that the ingot does not exist.

INDUSTRIAL APPLICABILITY The present invention has the effect of effectively preventing floating matter of molten metal from being mixed into the strip.

In addition, the present invention has an effect of preventing the temperature of the molten metal from being varied suddenly as the ingot is charged, thereby suppressing the generation of dross and improving the surface quality of the product.

1 is a view showing an apparatus for manufacturing a hot-dip galvanized steel sheet according to the present invention.
2 is a view showing a heater according to the present invention.
3 is a view showing a configuration of a molten metal guide according to the present invention.
4 is a view showing an example of the gradient of the separator according to the present invention.
5 is a view showing an apparatus for manufacturing a hot-dip galvanized steel sheet and a hot-dip galvanized steel sheet production monitoring apparatus according to the present invention.
FIG. 6 is a view showing a direct state of the apparatus for manufacturing a hot-dip galvanized steel sheet according to the present invention.
FIG. 7 is a flowchart showing a direct process of the apparatus for manufacturing a hot-dip galvanized steel sheet according to the present invention.

Hereinafter, an apparatus for manufacturing a hot-dip galvanized steel sheet according to the present invention will be described with reference to the accompanying drawings.

1 is a view showing an apparatus for manufacturing a hot-dip galvanized steel sheet according to the present invention.

Referring to FIG. 1, the apparatus for manufacturing a hot-dip galvanized steel sheet according to the present invention comprises a container unit 100 and an ingot supply unit 200.

In the container portion 100,

The container unit 100 according to the present invention comprises a plating tank 110, a strip inflow member 120, and a strip moving member 130.

The plating tank 110 has a storage space in which a predetermined amount of the molten metal 1 is stored, and an upper portion is opened.

The strip inflow member 120 is disposed upright on the upper side of the plating tank 110, and is preferably disposed at an oblique slope.

One end of the strip inflow member 120, that is, a lower end portion of the strip inflow member 120 is positioned inside the molten metal 1 so as to be immersed in the molten metal 1 stored in the storage space of the plating tank 110.

The strip S is continuously guided to move into the molten bath 1 of the plating bath 110 through the script inflow member 120. [

The strip moving member 130 is composed of a sink roll 131, a collecting roll 132, and an air knife 133.

The sink roll 131 is disposed at a position spaced apart from the lower end of the strip inflow member 120 in the storage space of the plating tank 110 and is rotated by external power.

The sink roll 131 keeps the strip S guided from the strip inflow member 120 to be impregnated into the melt 1 by rotation to guide the movement.

The collecting rolls 132 are constituted as a pair to guide the strip S guided from the sink roll 131 to move along the upper side of the plating tank 110.

The air knife 133 is disposed above the plating tank 110 and serves to clean the outer surface of the strip S drawn out from the molten metal 1 after impregnation by using air.

In the ingot supply unit 200,

The ingot supplying part 200 according to the present invention is disposed on the upper part of the container part 100 and heats the ingot 10 supplied from the outside so as to maintain the reference level at which the melt level in the container part 100 is preset, And is supplied to the interior of the container unit 100.

The ingot supply unit 200 includes an ingot placement unit 210, a heater 220, a melt level meter 240, and a controller 260.

The ingot placing device 210 is disposed on one side of the storage space of the plating tank 110. The ingot fastener 210 grips the ingot 10 and moves the gripped ingot 10 along the descending path p.

The ingot placement machine 210 is an apparatus such as an elevator, and receives the control signal from the controller 260 to descend the gripped ingot 10.

The heater 220 is located on the descending path p and is disposed at an upper end of one side of the storage space of the plating tank 110.

Preferably, the heater 220 is fixed to one edge of the plating tank 110.

2 is a view showing a configuration of a heater according to the present invention.

Referring to FIG. 2, the heater 220 according to the present invention includes a heater body 221 and heaters 222.

The heater body 221 is formed in the shape of a rectangular frame having upper and lower ends.

In addition, the heater body 221 is preferably formed of a refractory material, and the inner wall of the heater body is made of refractory bricks.

The hole formed at the center of the heater body 221 is a hole through which the ingot 10 is moved down and forms a heating space a in which the ingot 10 is heated.

Therefore, the ingot 10 can be heated and melted by the heaters 222 while descending through the heating space a.

The heaters 222 may be composed of gas burners.

The heaters 222, which are the gas burners, are arranged at equal intervals along the upper and lower sides of the heater body 221, and are disposed at intervals in the heater body 221.

The heaters 222 are connected to an air injection line and a gas injection line, which have open / close valves v1 and v2, respectively.

The air injection line supplies external air to the heaters 222, and the gas injection line supplies gas to the heaters 222.

The opening and closing valves v1 and v2 are connected to the controller 260 and the degree of opening and closing is controlled through a control signal from the controller 260 to adjust the amounts of air and gas injected.

In addition, the induction heating method may be applied to the heaters 222 in addition to the gas burner method as described above.

The molten metal level measuring device 240 is disposed at an upper portion of the plating tank 110 and measures the level of the molten metal 1 stored in the plating tank 110.

The melt level meter 240 may use either a distance measuring sensor or an ultrasonic sensor or a light sensor.

Here, the molten metal level can be calculated by the difference between the distance value to the bottom surface of the plating tank 110 and the distance value to the actual molten metal surface.

Then, the controller 260 sets the reference level in advance. The reference level includes a certain error range. The error range is preferably set to 1 mm.

Therefore, the controller 260 moves the ingot 10 along the downward path p by using the ingot fitting 210 so that the measured level of the molten metal forms a predetermined reference level, The ingot 10 is moved to the inside of the plating tank 110 by using the ingot 220.

Meanwhile, the heater 220 in the present invention further includes a molten metal guide portion 230.

The molten metal guide portion 230 includes a vertical partition wall 231 extending along the lower portion of the heater body 221 so as to be positioned inside the plating vessel 110 around the heater body 221, And the melt dissolved in the heating space (a) is supplied to the inside of the plating tank (110) through the guide holes (233a, 234a) at different positions And is composed of a plurality of separators 233 and 234.

Here, the sizes of the guide holes 233a and 234a formed in the separators 233 and 234 may be different from each other.

Preferably, the size of the guide holes 233a and 234a may be gradually reduced along the downward direction from the separators 233 and 234.

In addition, as shown in Fig. A plurality of separators 233 'and 234' may be formed with a gradient downward. This allows the ingot 10 to dissolve so that the melt can easily flow downward through the gradient of the separator plates 233 ', 234'.

The shielding plate 232 is formed at a predetermined length along the vertical direction so as to be positioned inside the plating vessel 110 at a lower end of the vertical partition 231 spaced apart from the inner wall of the plating vessel 110 according to the present invention. Is installed.

Since the shield plate 232 is installed, it is possible to prevent the melt, which dissolves the ingot 10, from flowing downward and rapidly entering the strip moving region in the plating vessel 110.

In addition, the ingot supply unit 200 includes an ingot charging detector 250,

The ingot charging detector 250 senses the presence or absence of the ingot 10 moved along the descending path p and transmits a signal indicating whether the ingot 10 is detected to the controller 260.

When the controller 260 receives a signal indicating that the ingot 10 is not present, the controller 260 stops driving the heater 220.

FIG. 5 is a view showing a monitoring apparatus for manufacturing a hot-dip galvanized steel sheet according to the present invention, FIG. 6 is a view showing a direct-acting state of the hot- FIG.

Next, the operation of the apparatus for manufacturing a hot-dip galvanized steel sheet of the present invention will be described.

Referring to FIG. 5, the apparatus for manufacturing a hot dip galvanized steel sheet according to the present invention includes a plurality of apparatuses, each of which is connected to a controller 260, and a controller 260 is connected to each of the melt level meters 240 are connected to monitors 50 that externally display the levels measured.

1, 6 and 7, the strip S flows into the inside of the molten metal 1 stored in the storage space of the plating tank 110, and flows into the strip inflow member 120 from the outside.

The strip S flowing into the inside moves through the strip moving member 130 in a state of being impregnated into the molten metal 1 and is drawn out through the upper part of the plating tank 110.

The melt level meter 250 disposed on the upper side of the plating vessel 110 measures the level of the melt 1 stored in the plating vessel 110 and transmits the measured level to the controller 260.

The controller 260 determines whether the measured melt level Lm is equal to a preset reference level Ls. Here, the reference level Ls includes a certain error range (1 mm).

When the measured melt level Lm is lower than the reference level Ls, the controller 260 moves the ingot 10 along the descending path p while gripping the ingot 10 using the ingot fastening device 210 .

The ingot charging sensor 250 installed near the descending path p senses the presence or absence of the ingot 10 moved along the descending path p of the ingot 10, To the controller (260).

The controller 260 maintains the driving of the ingot placement unit 210 when the ingot 10 exists.

Then, the ingot 10 is moved along the descending path p through the descending operation of the ingot placing device 210.

The moving ingot 10 is introduced into the heating space a formed in the heater 220.

The controller 260 controls the driving of the on / off valves v1 and v2 so that gas and air are injected into the heaters 222 of the heater 220 by a predetermined amount.

Thus, the heaters 222 such as gas burners can heat the ingot 10 which is drawn into the heating space a. Then, the ingot 10 to be heated is dissolved and can flow downward.

The melted material flowing downward flows into the inner space of the vertical partition wall 231 extending downwardly of the heater body 221, and falls into the multi-layered separators 233 and 234.

The melted material dropped on the separators 233 and 234 flows downward through the guide holes 233a and 234a formed in the separators 233 and 234, respectively.

Therefore, the melt formed by heating the ingot 10 is sequentially dropped through the respective separators 233 and 234, gradually flows into the inner molten metal of the plating tank 110 through the respective guide holes 233a and 234a Therefore, the generation of dross due to the rapid mixing of the molten metal with the molten metal can be effectively prevented.

That is, the zinc dissolved in the heater 220 has a high aluminum (Al) and a low iron (Fe) in comparison with the components of the inner molten metal 1 of the plating bath 110. Therefore, when the zinc is mixed with the molten metal rapidly, A local saturation degree change due to the change of the saturation degree may occur, which may be a main factor of generation of dross. The present invention can solve this problem.

The melted material flowing downward through the separators 233 and 234 flows into the region where the strip S flows even if it is mixed with the molten metal 1 by the shielding plate 232 extending downward from the vertical partition wall 231 It can be prevented that it is mixed.

Therefore, the present invention prevents drastically from being mixed into the strip moving region while the melt is mixed into the molten metal 1, which can also suppress the generation of dross.

Accordingly, the present invention repeats the above process until the measured melt level Lm reaches a preset reference level Ls.

On the other hand, when a signal indicating that the ingot 10 is not present on the descending path p is generated through the ingot charging detector 240, the controller 260 uses the ingot placing device 210 to generate a new ingot And can be positioned on the descending path (p).

Through the above-described structure and operation, in order to solve the problem that the ingot at room temperature is settled directly in the plating bath to cause the deterioration of the bath temperature, the embodiment according to the present invention is characterized in that the ingot is placed on the molten bath surface, By controlling the driving of the heater to dissolve the ingot by preventing the generation of dross due to the lowering of the bath temperature due to the dissolution and replenishment of the ingot and by interfering with the fluctuation of the bath surface due to the supply of a large amount of zinc, It has the advantage of improving the yield.

As described above, the concrete embodiments of the apparatus for manufacturing a hot-dip galvanized steel sheet according to the present invention have been described. However, it is apparent that various modifications can be made without departing from the scope of the present invention.

Therefore, the scope of the present invention should not be limited to the above-described embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

It is to be understood that the foregoing embodiments are illustrative and not restrictive in all respects and that the scope of the present invention is indicated by the appended claims rather than the foregoing description, It is intended that all changes and modifications derived from the equivalent concept be included within the scope of the present invention.

10: Ingot 100:
110: Plating tank 120: Strain inlet member
130: strip moving member 200: ingot supply unit
210: ingot 220: heater
230: Ingot guide portion 231: Vertical partition
232: shield plate 233, 234: separator plate
240: Melting pot level meter 250: Ingot charging sensor
260:

Claims (11)

A container for storing the molten metal to be melted and forming a path for impregnating the strip introduced from the outside; And
And an ingot supply unit disposed on the upper portion of the container unit for heating and melting a gap supplied from the outside so as to maintain a reference level at which the melt level in the container unit is preset, Galvanized steel sheet manufacturing apparatus.
The method according to claim 1,
The container portion
A plating bath in which a predetermined amount of the molten metal is stored,
A strip inflow member disposed at an upper portion of the plating bath and introducing the strip into the molten metal and having one end located inside the molten metal;
And a strip moving member disposed inside the plating tank and having a plurality of rollers for impregnating and impregnating the strip drawn out from the strip inflow member into an upper portion of the plating bath, Manufacturing apparatus.
3. The method of claim 2,
The ingot supply unit,
An ingot placing unit disposed on the plating vessel for gripping the gaps and forming a descending path for descending the ingot gripped by receiving power from the outside toward the inside of the plating vessel;
A heater disposed at a lower portion of the ingot charging unit and disposed to surround the descending path of the ingot to be lowered and heating and melting the ingot lowered along the descending path,
A molten metal level measuring device disposed on the plating tank for measuring the level of the molten metal stored in the plating tank;
The ingot is moved along the descending path by using the ingot inserting device so that the level of the molten metal measured forms a predetermined reference level and the ingot moved by using the heater is melted and supplied to the inside of the plating bath And a controller for controlling the temperature of the molten zinc plated steel sheet.
The method of claim 3,
The heater
A heater body formed of a refractory material to form a heating space opened up and down so as to surround the descending path of the ingot,
And a plurality of heaters formed at intervals in the heater body and heating the ingot moved along the descending path to a predetermined temperature.
5. The method of claim 4,
Wherein the plurality of heaters comprises:
Wherein the ingot is one of a gas burner system which is supplied with air and gas from the outside and which is ignited to heat the ingot or an induction heating system.
5. The method of claim 4,
The heater further includes a molten metal guide portion for guiding the supply of the molten metal.
The molten-
A vertical partition wall extending along a lower portion of the heater body so as to be positioned in the interior of the contractor at a periphery of the heater body,
And a plurality of separators formed in the plurality of layers in the vertical partition wall for supplying the molten metal dissolved in the heating space through the guide holes at different positions into the plating vessel. Steel plate manufacturing apparatus.
The method according to claim 6,
Wherein the guide holes have different sizes from each other.
The method according to claim 6,
Wherein the plurality of separator plates are formed with a gradient downward.
The method according to claim 6,
At the lower end of the vertical partition wall spaced apart from the inner wall of the plating vessel,
Wherein a shielding plate having a predetermined length along a vertical direction is further provided so as to be positioned inside the plating bath.
The method of claim 3,
The ingot supply unit includes an ingot charging sensor,
The ingot charging sensor detects the presence of the ingot moved along the descending path and transmits a signal indicating whether or not the ingot exists to the controller,
Wherein the controller stops driving the heater when receiving a signal indicating that the ingot does not exist.
A galvanized steel sheet manufacturing apparatus according to any one of claims 1 to 10,
And monitors for monitoring the melt level in real time in the hot dip galvanized steel sheet manufacturing apparatuses.

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