KR102422941B1 - Apparatus for removing floating solids from molten metal - Google Patents

Abstract

The present invention relates to a dross removal device for a hot-dip plating tank that can prevent damage to a hot-dip plating facility caused by interference with a dross removal device when a snorkel part installed in a hot-dip plating tank starts tilting.
A dross removal device for a hot-dip plating bath according to the present invention comprises: a distance measuring means disposed at a position spaced apart from a molten metal surface of a plating bath by a predetermined distance; , a control means for controlling the dross removal means, wherein the distance measuring means measures a distance from a snout or a molten metal surface installed in the plating bath, and the dross removal means measures a predetermined distance from the molten metal surface of the plating bath. a body part movably disposed along a guide rail disposed at a distance apart from each other; and a dross removal part extending from the body part toward the molten metal surface of the plating bath to collect dross floating in the molten metal to a predetermined position; and the control means controls the operation of the dross removal means based on the measurement data of the distance measurement means or generates an alarm signal for the user when the measured distance from the distance measurement means is within a predetermined value characterized in that

Description

Molten surface floating material removal device {APPARATUS FOR REMOVING FLOATING SOLIDS FROM MOLTEN METAL}

The present invention relates to an apparatus for removing dross generated in a hot-dip plating bath, and more particularly, interference between a snorkel constituting the snout and a dross removal device when a snout installed in a hot-dip plating bath is tilted and started. It relates to making it possible to prevent damage to hot-dip plating equipment and/or dross removal equipment caused by

The surface of general steel sheet products are subjected to various plating treatments for the purpose of improving corrosion resistance and durability. In particular, hot-dip plating, which is made by passing a steel sheet through a molten metal in which the material to be plated, is a technology that is widely used even today despite its long history as it exhibits excellent economic efficiency and plating quality.

The management of the molten metal is very important in such hot-dip plating, because during the plating process, the molten metal on the surface is oxidized and formed, and defects in the plating layer are easy to occur due to the floating metal oxides (dross). In particular, when the steel sheet passes through the plating bath, high-pressure gas is used to control the amount of plating adhered to the plating bath surface. At this time, the applied cold air reacts with the molten metal at the top of the plating bath to form dross, which is a lump of metal oxide. easy to make Such dross may be adhered to a roll or an immersion facility, or may be included in a plating layer of a steel sheet to cause product defects, and thus, effective removal is required.

However, the temperature of the plating bath is 400 ~ 650 ℃, and the upper part of the molten metal is about 200 ℃, which is not only high enough for the human body to handle, but also very corrosive metal fume is generated and dross floating in the molten metal in the plating bath. Since it is very difficult for a person to directly remove the dross, an automated dross removal device is required.

The dross removal device collects the dross floating in the plating bath to an easy-to-remove position while operating from the upper portion separated by a predetermined distance from the molten metal surface of the plating bath. However, in the center of the plating bath, a lot of devices such as a snout, snorkel, metal pump, and various roll supports are installed. .

In the case of a snorkel corresponding to the main equipment of the double hot-dip plating tank, a tilting operation to adjust the inclination angle according to the operating conditions is frequently performed. At this time, as shown in FIG. A collision may occur with the snorkel, and in the event of a collision, the product passing through is damaged by giving an impact to the snorkel. roll) and the strip being plated, causing damage to the sink roll, which can lead to serious equipment accidents requiring long-term repair.

Therefore, the conventional operation of the dross removal device made by the operator's judgment is always grasped at the angle of the snorkel, and the dross removal device allows the operation to avoid a collision by itself without the operator's judgment in consideration of the tilting operation. It is necessary to develop a removal device.

Republic of Korea Patent Publication No. 10-1842168

An object of the present invention is to provide a dross removal device for hot-dip plating that can be started in consideration of the tilting state of the snorkel and can prevent serious equipment accidents due to collision between the snorkel and the dross removal device. is to provide

In order to achieve the above object, the present invention provides a distance measuring means disposed at a position spaced apart from a molten metal surface of a plating bath by a predetermined distance, a dross removing means for collecting dross floating in the molten metal of the plating bath to a predetermined position, A dross removal device for hot-dip plating comprising a control means for controlling the loss removal means, wherein the distance measuring means measures a distance to a snout or a molten metal surface installed in the plating bath, and the dross removal means is the plating A body portion that is movably disposed along a guide rail disposed at a position spaced a predetermined distance from the molten metal surface of the bath, and the dross floating in the molten metal extending from the body portion toward the molten metal surface of the plating bath is collected at a predetermined position and a dross removal unit, wherein the control unit controls the operation of the dross removal unit based on the measurement data of the distance measurement unit, or when the measured distance from the distance measurement unit is within a predetermined value, Provided is a dross removal device for hot-dip plating that generates an alarm signal.

According to the present invention, since the tilting angle of the snout can be checked in real time through the data measured by the distance measuring means, the operation of the dross removal means can be controlled by using this to control the operation of the dross removal means, or the user can It is possible to effectively prevent the collision between the dross removal means and the snout (including the snorkel) by allowing the operator to perform the operation of preventing the collision between the distance measuring means and the snout (including the snorkel) from occurring in advance.

In addition, the distance measuring means includes a housing having an opening formed on one side, a distance measuring sensor disposed inside the housing, and gas is injected into the housing to prevent gas generated from the molten metal of the plating bath from penetrating into the opening. It may include a gas injection means to make it possible.

As such, the distance measuring sensor disposed in the distance measuring means is vulnerable to heat and fumes generated in the plating bath, so it is difficult to maintain durability. According to an embodiment of the present invention, the distance measuring sensor is disposed inside the housing, By emitting sound waves or light for distance measurement through the opening and allowing external cooling gas to be continuously injected into the housing through the gas injection means, the distance measurement sensor is protected from the strong heat of the plating bath, and at the same time, the opening It is possible to prevent penetration of highly corrosive fumes. Accordingly, it is possible to secure the durability of the distance measuring sensor and the reliability of the device.

In addition, the gas injection means may include a first gas injection hole formed on one side of the housing, and a gas injection means for injecting gas into the first gas injection hole.

In addition, the opening includes a first protruding tube extending outward by a predetermined distance from the outer periphery of the opening, and a predetermined distance to the outside of the first protruding tube, while accommodating the first protruding tube to the outside compared to the first protruding tube A second protrusion pipe extending longer, and a second gas inlet for injecting gas to one side of the second protruding tube, the gas may be injected into the second gas inlet through the gas injection means.

In this way, when the first and second protruding tubes are formed on the outer periphery of the opening and gas is injected from one side of the second protruding tube, the gas is discharged outside while riding on the outside of the first protruding tube in a cyclone form. Thus, it is possible to effectively prevent the inflow of fume from the outside and the fume from adhering to the outer end of the first protruding pipe or the second protruding pipe.

In addition, the distance measuring means may preferably be a distance measuring sensor using ultrasonic waves or light.

In addition, the snout is composed of a snout part that is subjected to heat treatment by entering the strip from the outside, and a snorkel part that infiltrates the heat-treated strip into the molten metal surface of the plating bath, and the distance measuring means preferably measures the distance to the snorkel part. can do.

The dross removal device for hot-dip plating according to the present invention controls the start of the dross removal device to prevent collision with the snorkel by detecting in real time the tilting operation state of a snout (including a snorkel) that is deformed in a high temperature environment. , it is possible to warn the operator, so that serious equipment accidents that occur during the plating process can be prevented in advance.

In addition, the distance measuring sensor installed in the dross removal device for hot-dip plating according to an embodiment of the present invention can protect the distance measuring sensor from zinc powder, corrosive fumes, and heat generated from the molten metal. Life and reliability can be significantly increased.

1 is a schematic diagram for explaining a state in which a collision between a snorkel and a dross removal device occurs due to the tilting operation of the snorkel in the hot-dip plating facility.
2 is a schematic diagram of a hot-dip plating facility including a dross removal device according to an embodiment of the present invention.
3 is a cross-sectional view of a distance measuring means constituting the hot-dip plating apparatus of FIG. 2 .
4 is a view for explaining a control operation process of the control means provided in the dross removal apparatus according to an embodiment of the present invention.
5 shows a state in which the distance measuring means is arranged to measure the level of the hot water surface of the plating bath.
6 shows a state in which the distance measuring means is arranged to measure the angle of inclination of the snout.

Hereinafter, the configuration and operation of the embodiment of the present invention will be described with reference to the accompanying drawings. In the following description of the present invention, if it is determined that a detailed description of a related well-known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. In addition, when a part 'includes' a certain component, this means that other components may be further included, rather than excluding other components, unless otherwise stated.

2 is a schematic diagram of a hot-dip plating facility including a dross removal device according to an embodiment of the present invention.

As shown in FIG. 2, the hot-dip plating facility includes a snout 10 that is inclined at a predetermined angle to one side of a molten zinc pot accommodated in a plating tank (not shown), and the snout 10. and a dross removal device 20 disposed to be spaced apart from the molten metal by a predetermined distance, and a sink roll 30 installed inside the molten metal.

The snout 10 includes a snout unit 11 that introduces a strip transported for hot-dip galvanizing and maintains the temperature of the strip above a certain temperature, and is fastened to the snout unit 11 to plated the strip. It comprises a snorkel part 12 for immersion into the bath.

A hinge point 13 for enabling rotation and a tilting means 14 for adjusting the inclination angle are disposed on one side of the snout 10 . The tilting means 14 is provided with a device for linear motion of a device such as a hydraulic cylinder, and the linear motion is rotated through the hinge point 13 so that the inclination angle of the snout 10 is to be regulated.

The dross removal device 20 includes a main body 21 movable along a guide rail installed on the upper part of the plating bath by a driving means, and a main body connection part 22 extending from the main body 21 toward the molten metal surface of the plating bath. ), a dross removal part 23 fastened to one side of the main body connection part 22, and a distance measuring means 24 fixed to one side of the main body 21 at a position opposite to the snout 10. and a control unit 25 (not shown) for generating a control signal using the information measured by the distance measuring unit 24 .

A driving means such as a plurality of motors for enabling linear or tilting start of the main body 21 is disposed inside the main body 21, or driving is made through a connection device with a driving means disposed outside. has been

The main body connection part 22 may simply be formed of a fastening means such as a bolt for fastening with the dross removal part 23 . In addition, if necessary, it may be fastened to enable rotation of the dross removal unit 23 .

The dross removal unit 23 includes a skimmer 23a that is partially or completely immersed in the molten metal surface of the plating bath and directly contacts the dross floating in the plating bath to move the dross to a predetermined position in the plating bath, and one end of the skimmer 23a ) and extending in the direction of the body, the other end may include a skimmer arm (23b) connected to the body (21) through the connection (22). The skimmer 23a can have a maximum width so that it can be moved in a wide area even with a single maneuver in order to increase efficiency.

3 is a cross-sectional view of a distance measuring means constituting the hot-dip plating apparatus of FIG. 2 . As shown in FIG. 3, the distance measuring means 24 provides a driving force to the main body 21 and includes an open frame shape or a closed shape holding part 24a for fixing to a non-moving driving means and , a housing 24b having a substantially hexahedral shape fixed to the holder 24a, a distance measuring sensor 24c fixedly disposed inside the housing 24b, and a substantially circular shape formed on one side of the housing 24b an opening 24d of a, a first protruding tube 24e extending outwardly by a predetermined distance from the outer periphery of the opening 24d, and the first protruding tube at a predetermined distance outside the first protruding tube 24e It includes a second protruding pipe 24f having a tapered shape that extends outwardly longer than the first protruding pipe 24e while enclosing the 24e and has a tapered shape that decreases in diameter toward the outside.

In addition, a first gas inlet 24g for injecting gas (eg, air) through an external air pump and a gas injection means (not shown) is formed on one side of the housing 24b. Through this, air is supplied to the inside of the housing 24b by means of a gas injection means to cool the inside of the housing 24b, and at the same time, it is possible to prevent external fumes from penetrating into the inside of the housing 24b.

In addition, a second gas inlet 24h for injecting the gas supplied from the gas injection means is formed on one side of the second protruding tube 24h opposite to the accommodated first protruding tube 24e. Through this, the gas injected into the second gas inlet 24h flows in the form of a cyclone and is discharged to the outside to prevent the metal from attaching to the ends of the first and second protrusions 24e and 24h by fumes. Rather, it is possible to more reliably prevent the fume from penetrating into the housing 24b through the flow in the form of a cyclone formed in the opening 24d.

The distance measuring sensor 24c may use a sensor such as a laser sensor that measures a distance using sound waves like an ultrasonic sensor or a laser sensor that measures a distance using light such as a laser.

The control means 25 is not particularly limited as long as it can generate a control signal for starting and stopping the driving means for driving the main body 21 by calculating the electrical signal measured by the distance measuring sensor 24 . That is, the control means 25 may be a board on which a program installed in the main body is embedded, or a computer disposed at a location spaced apart from the main body.

The sink roll 30 rotates in either a clockwise or counterclockwise direction to pass the strip through the inside of the plating bath and transfer the strip to the upper portion of the plating bath. In addition, air knives (not shown) are disposed on both sides of the strip discharged to the outside to control the plating thickness of the molten zinc attached to both sides of the strip coming out of the plating bath by spraying compressed air or nitrogen.

Next, an operation process of the dross removal apparatus for hot-dip plating according to an embodiment of the present invention will be described.

As shown in Fig. 1, the plating operation condition is changed and the tilting means 14 is operated to change the inclination angle of the snout 10, so that the position of the snout 10 in the plating tank is changed from the solid line to the dotted line. position will be changed.

At this time, when the dross removal device 20 is operated according to the position of the existing snout 10 , the skimmer 23a for transferring the dross collides with the snorkel unit 12 as shown. When such a collision occurs, some parts separated from the dross removal device 20 or the snout 10 may fall into the molten metal, and the parts falling into the molten metal become entangled between the rotating sink roll 30 and the strip in progress. It causes breakage or breakage of the sink roll 30, which causes a major equipment accident that requires repair for a long time by stopping the entire production line.

On the other hand, in the case of the dross removal apparatus 20 according to an embodiment of the present invention, the distance between the snouts 10 is measured in real time through the distance measuring sensor 24c. The distance data obtained in this way is transmitted to the control unit 25 as shown in FIG. 4 , and the control unit 25 compares and calculates the current position information in which the main body 21 is operating, and when a collision is expected, the main body A start control signal capable of preventing a collision is transmitted to the driving means of (21), or an alarm signal for a user is generated. In this case, the start control signal and the alarm signal may be simultaneously generated, or one of the alarm signal and the start control signal may be generated.

The start control signal may be a signal for continuing an operation in progress or stopping an operation in progress. For example, when the safety interval between the snorkel and the skimmer 23a fastened to the body 21 is set to 100 mm, when the safety interval 100 mm is maintained through the distance information measured in real time, the dross removal device 20 is started If it is difficult to maintain the dross as it is, and to maintain a safety distance of 100 mm, the dross removal device 20 may be stopped and an alarm may be generated so that the operator can take follow-up measures.

In addition, when the control means 25 is configured to control the tilting means 13 of the snout 10 together, the distance calculated from the distance measured from the distance measuring sensor 23c is safe. When it is determined that the gap is narrower, a signal for controlling the tilting angle of the snout 10 may be generated.

On the other hand, the distance measuring means 20 can be used differently arranged in two forms.

First, as shown in FIG. 5 , when the distance measuring means is arranged to measure the level of the tang surface of the plating bath, the dross removal device 20 can operate normally without colliding with the snout 10 . In this case, only the hot water surface height of the plating bath is continuously measured, but the angle of the snorkel part 12 of the snout 10 is changed through the tilting operation of the snout 10, so that the distance measuring means is the hot water surface of the plating bath. When detecting the snorkel part 12 floating from the measured distance is reduced. Through the distance measured in this way, it is determined whether the control means 25 can maintain the safety interval and generates the control signal or the alarm signal as described above.

In addition, as shown in FIG. 6 , when the distance measuring means is arranged to measure the distance to the snout, when there is a tilting maneuver of the snout 10, the measured distance information of the snout 10 is used. The change in the inclination angle of the snorkel unit 12 is calculated, and it is determined whether the control means 25 can maintain the safe interval to generate a control signal or an alarm signal as described above.

Through the above process, it is possible to prevent a serious accident such as collision with the dross removal device due to the tilting maneuver of the snout (including the snorkel).

10: Snout
11: snout
12: snorkel unit
13: hinge point
14: tilting means
20: dross removal device
21: body
22: body connection part
23: dross removal unit
24: distance measuring means
25: control means
30: sink roll

Claims (6)

a distance measuring means arranged at a position spaced apart from the molten metal surface of the plating bath by a predetermined distance; As a dross removal device for hot-dip plating,
The distance measuring means measures the distance to the snout or the molten metal surface installed in the plating bath,
The dross removing means includes a body part movably disposed along a guide rail disposed at a location spaced apart from the molten metal surface of the plating tank by a predetermined distance, and extending from the body part toward the molten metal surface of the plating bath to float in the molten metal. and a dross removal unit that collects dross to a predetermined position,
The control means controls the operation of the dross removal means based on the measurement data of the distance measurement means or generates an alarm signal for the user when the measured distance from the distance measurement means is within a predetermined value,
The distance measuring means includes a housing having an opening on one side, a distance measuring sensor disposed inside the housing, and a gas injection for injecting gas into the housing so that the gas generated from the molten metal in the plating bath does not penetrate into the opening. means, including
The gas injection means includes a first gas inlet formed on one side of the housing, and a gas injection means for injecting gas into the first gas inlet,
The opening includes a first protruding tube extending outwardly by a predetermined distance from the outer periphery of the opening, and a predetermined distance to the outside of the first protruding tube, while accommodating the first protruding tube outwardly longer than the first protruding tube a second protruding tube extending, and a second gas inlet for injecting gas through the gas injection means to one side of the second protruding tube,
The second protrusion pipe has a tapered shape that decreases in diameter as it extends outward from the portion accommodating the first protrusion pipe, so that the gas injected into the second gas inlet is discharged to the outside through flow, Dross removal device for hot-dip plating.
delete delete delete The method of claim 1,
The distance measuring means is a distance measuring sensor using ultrasonic waves or light, dross removal device for hot-dip plating. The method of claim 1,
The snout is composed of a snout part that is subjected to heat treatment by entering the strip from the outside, and a snorkel part that infiltrates the heat-treated strip into the molten metal surface of the plating bath, and the distance measuring means measures the distance to the snorkel part, hot-dip plating Dragon dross removal device.

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