JP2001131724A - Continuous hot dip metal coating apparatus, and positional adjusting device, and positional adjusting method in continuous hot dip metal coating means - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a continuous hot dip metal coating apparatus with a simple structure and excellent in the maintenance workability and a continuous hot dip metal coating method and a positional adjusting device in the continuous hot dip metal coating means. SOLUTION: Molten metal is continuously coated on a steel strip and a metal coated thickness control means for controlling the metal coated thickness is provided and has the positional adjusting device with which at least one of jointed shaft is provided. In this way, the apparatus has the simple structure and the maintenance is easily executed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous hot-dip metal plating apparatus, a continuous hot-dip metal plating method, and a position adjusting apparatus for a continuous hot-dip metal plating means for continuously performing metal plating on a running steel strip.

[0002]

2. Description of the Related Art Conventionally, when a steel strip is subjected to hot-dip metal plating in a continuous hot-dip metal plating equipment, a steel strip heated and annealed in a heating furnace is introduced into a molten metal bath through a snout in a non-oxidizing atmosphere. It is turned by a sink roll immersed in a molten metal bath, pulled up, and plated.

[0003] In controlling the thickness of the steel strip plating, gas is ejected from a nozzle facing the steel strip surface when the steel strip is pulled up above the molten metal bath to wipe off the excess molten metal adhering to the steel strip. As a result, a so-called gas wiping method for obtaining a predetermined plating thickness is performed. For example, Japanese Patent Application Laid-Open No. Hei 6-81094 is an example.

Conventionally, a nozzle used for controlling the plating thickness is supported by a support structure installed around a molten metal bath, and a nozzle elevating and lowering mechanism comprising a motor, a worm jack and the like installed on the support structure. , Opening and closing, and the nozzle header rotating mechanism change the position.

[0005]

As described above, the plating nozzle is supported by a support structure provided around a molten metal bath, and is constituted by a motor, a worm jack and the like provided on the support structure. Nozzle lifting, opening and closing,
Since the nozzle position is changed by the nozzle header rotating mechanism, the nozzle position adjusting device is complicated, which hinders the work (for example, dross removing work) performed by an operator around the molten metal bath.

Further, in the gas wiping method, the nozzle may be replaced in accordance with the width of the steel strip on which the hot-dip metal plating is performed. In this case, the support structure of the nozzle and the nozzle position adjusting device are complicated and heavy. Because of its heavy weight, it was necessary to transfer it to a storage trolley using a crane for maintenance.
For this reason, the line must be stopped for a long time, causing various losses such as a decrease in the operation rate of the line, a decrease in the yield, and a loss of energy required for holding the heating furnace.

[0007] Also, during maintenance of equipment in a molten metal bath such as a sink roll, it is necessary to move the plating nozzle and the complete nozzle position adjusting device, resulting in the same loss.

An object of the present invention is to provide a continuous hot-dip metal plating equipment, a continuous hot-dip metal plating method, and a position adjusting device for a continuous hot-dip metal plating means having a simple structure and excellent in maintainability.

[0009]

SUMMARY OF THE INVENTION The continuous molten metal plating equipment of the present invention is a continuous molten metal plating equipment provided with plating thickness control means for continuously plating molten steel on a steel strip and controlling the plating thickness. The plating thickness control means includes a position adjusting device provided with at least one joint axis.

Alternatively, the continuous hot-dip metal plating equipment of the present invention is a continuous hot-dip metal plating equipment provided with plating thickness control means for continuously plating molten steel on a steel strip and controlling the plating thickness. It is characterized in that the plating thickness control means is supported via a joint shaft.

Alternatively, the continuous molten metal plating equipment of the present invention is a continuous molten metal plating equipment provided with plating thickness control means for continuously plating molten steel on a steel strip and controlling the plating thickness. The control means is provided with a position adjusting device provided with three or more joint axes for each of a pair of gas injection nozzles arranged opposite to the steel strip surface.

Alternatively, the position adjusting apparatus of the continuous molten metal plating means of the present invention is a continuous molten metal plating means having a plating thickness control means for continuously plating a molten steel on a steel strip and controlling the plating thickness. In the position adjustment device,
The plating thickness control means is characterized in that each of the pair of gas injection nozzles disposed opposite to the steel strip surface is supported by a support device having three or more joint axes.

The position adjusting method of the continuous molten metal plating means of the present invention is to adjust the position of the continuous molten metal plating means provided with plating thickness control means for continuously plating molten steel on a steel strip and controlling the plating thickness. The method is characterized in that three or more joint axes of a support device for supporting the plating thickness control means are operated to move the position of the continuous molten metal plating means.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The plating nozzle position adjusting means in the embodiment of the present invention is characterized in that each of a pair of gas injection nozzles arranged opposite to the steel strip surface has at least one joint shaft. It has a characteristic adjustment mechanism. Here, three or more joint axes are desirable. Using this adjustment mechanism, adjustment of the interval between a pair of plating nozzles, adjustment of the height of the nozzle from the molten metal bath surface, adjustment of the injection angle of the nozzle, the centering of the nozzle in the steel strip width direction, the nozzle and the steel strip Distance control between surfaces can be performed.

Further, the plating nozzle position adjusting apparatus according to the embodiment of the present invention moves the plating nozzle directly to a storage trolley or to a predetermined working position at the time of replacement or maintenance of the plating nozzle and equipment in the molten metal bath. A mechanism is provided to perform replacement work and maintenance easily.

Further, for example, in the gas wiping method, a conventional plating nozzle position adjusting device, which has a complicated structure and deteriorates the workability of the surroundings, uses a conventional plating nozzle position adjusting device which moves the plating nozzle position to three.
By performing adjustment using an adjustment mechanism characterized by comprising at least one joint axis, the mechanism can be simplified, and a plating nozzle position adjustment device can be provided that has a favorable working environment for a worker around a molten metal bathtub. it can.

[0017] Further, the centering control of the plating nozzle in the width direction of the steel strip and the distance control between the nozzle and the steel strip surface are performed by using an adjusting mechanism characterized by comprising three or more joint axes. It is possible to perform plating with good thickness uniformity.

[0018] Further, in contrast to a conventional plating nozzle position adjusting device which had to be moved using a maintenance crane at the time of replacement and maintenance of the plating nozzle and equipment in the molten metal bath, the plating nozzle was moved to a storage cart or to a predetermined position. By providing a mechanism for directly moving to the work position, it is possible to provide a plating nozzle position adjusting device that shortens the line stop time, improves the line operation rate, and reduces energy loss. (Embodiment 1) An embodiment of the present invention will be described below with reference to the drawings. 1, 2, and 3 show a continuous hot-dip metal plating apparatus according to an embodiment of the present invention, which is a side view, a top view, and a front view, respectively.

As shown in FIG. 3, the steel strip 1 heated and annealed in the heating furnace is guided to the molten metal bath 2 through a snout 12 in a non-oxidizing atmosphere. Then, the guided steel strip 1 is turned by a sink roll 10 immersed below the liquid level of the molten metal 3, and travels vertically upward (Z direction) through a shape correction roll 11. .

Steel strip 1 pulled up from molten metal bath 2
, A gas is injected from a plating nozzle 4 which is a pair of gas injection nozzles arranged to face the steel strip surface. The plating nozzle 4 has a gas supply flexible hose 9.
The gas is supplied from the gas supply flexible hose 9 to the plating nozzle 4. By the energy of the gas injected from the plating nozzle 4, the molten metal 3 excessively attached to both sides and the end of the steel strip 1 can be blown off, and the plating thickness can be adjusted to a predetermined thickness.

In such a gas wiping method, the height of the plating nozzle 4 from the molten metal liquid surface, the distance from the surface of the steel strip 1 and the angle of the nozzle header are important parameters.

In this embodiment, as a means for adjusting these parameters, a plating nozzle position adjusting mechanism having a desired joint axis is provided for each of a pair of gas injection plating nozzles 4 which are plating thickness adjusting means.

Next, a description will be given of a plating nozzle supporting mechanism and a position adjusting mechanism.

As shown in FIGS. 1 to 3, the pair of plating nozzles 4 are supported by respective plating nozzle position adjusting mechanisms. The plating nozzle position adjusting mechanism in the present embodiment includes a plating nozzle position adjusting mechanism main body 5 and arms 27 to 3.
1, a plating nozzle position adjusting mechanism main body rotating shaft 21, bending joints 22 to 24, and rotating joints 25 and 26 are provided.

Here, the case where the plating nozzle position adjusting mechanism main body 5 is installed at the position shown in FIGS. 1 to 3 will be described, but it may be installed at another position. In this embodiment,
The joint includes a rotating part and a bending part.

Plating nozzle position adjusting mechanism body rotating shaft 21
Is mounted on a base near the molten metal bath 2. The plating nozzle position adjusting mechanism main body 5 is attached to the plating nozzle position adjusting mechanism main body rotating shaft 21 and is supported so as to be rotatable in a horizontal plane about this axis.

The plating nozzle position adjusting mechanism main body 5 and the arm 27 are connected by a bending joint 22. The bending joint 22 causes the arm 27 to move in a vertical plane.
The arm 27 can be moved by rotating the arm 27 about the axis.

The arm 27 and the arm 28 are connected to the bending joint 23.
Are connected by The arm 28 is rotated by the refraction joint 23 around the refraction joint 23 in a vertical plane,
As a result, the arm 28 can be moved.

The arm 28 and the arm 29 are
5 are connected. The arm 29 can be rotated by the rotating joint 25. As a result, the spray angle of the plating nozzle 4 can be adjusted.

The arm 29 and the arm 30 are connected to the bending joint 2
4 are connected. The arm 30 can be rotated around the bending joint 24 in a horizontal plane by the bending joint 24. As a result, the parallelism between the plating nozzle 4 and the steel strip 1 can be adjusted.

The arm 30 and the arm 31 are
6 are connected. The arm 31 can be rotated by the rotary joint 26. As a result, the parallelism of the plating nozzle 4 with respect to the horizontal plane can be adjusted.

The arm 31 and the plating nozzle 4 are connected, and the plating nozzle 4 is supported. According to the above configuration, for example, by using one joint shaft to support the plating nozzle 4 and operating the joint shaft, it is possible to easily change the position of the plating nozzle 4 with a simple structure. Thus, a time-consuming operation using a conventional crane or the like can be performed simply and in a short time. Also, for example, by supporting the plating nozzle 4 using three joint axes, by operating the three joint axes,
With a simple structure, the position of the plating nozzle 4 can be easily changed, and various positions of the plating nozzle 4 can be easily adjusted, leading to an improvement in the accuracy of plating thickness control. In addition, 3
When two or more joint axes are used, a first joint axis that allows the object to move in a horizontal plane and a vertical plane that is parallel to the steel strip plane near the plating nozzle 4 installation. A second joint axis that allows the object to move, and a third joint axis that allows the object to move in a vertical plane that is perpendicular to the steel strip surface near the installation of the plating nozzle 4. It is desirable to install. With such a configuration, the plating nozzle 4 can be moved in three axes, and various positions can be adjusted. That is, it is desirable that the object can be moved on three planes in the horizontal plane, the first vertical plane, and the second vertical plane orthogonal to the first vertical plane.

Next, a method of adjusting the interval of the plating nozzle 4, adjusting the height, adjusting the position in the steel strip width direction, and adjusting the injection angle in the present embodiment will be described.

FIG. 4 is an operation diagram for adjusting the interval between the plating nozzles 4. The plating nozzle 4 is supported by arms 27 to 31 that are rotatably mounted on the plating nozzle position adjusting mechanism main body rotation shaft 21 in a horizontal plane. That is, by rotating the plating nozzle 4 in a horizontal plane through the plating nozzle position adjusting mechanism main body 5 and the arms 27 to 31 around the plating nozzle position adjusting mechanism main body rotating shaft 21 which is one of the joint axes, The position of the plating nozzle 4 in the horizontal plane can be changed. That is, the adjustment of the injection position, the replacement work of the plating nozzle 4, and the like become easy.

Further, the plating nozzle position adjusting mechanism, which is one of the joint axes, is rotated around the main body rotating shaft 21 and at the same time,
The bending joints 22 to 24 and the rotating joint 26 are operated to maintain the position of the nozzle 4 in the steel strip width direction (Y direction), the position of the steel strip in the traveling direction (Z direction), and the parallelism between the steel strip surface and the molten metal bath surface. Thereby, only the position of the pair of nozzles 4 in the steel strip surface direction (X direction) can be changed, and the interval between the pair of plating nozzles 4 can be changed.

That is, the relative position of the steel strip 1 and the plating nozzle 4 can be changed by rotating the plating nozzle 4 in a horizontal plane about the rotation axis 21 of the plating nozzle position adjusting mechanism main body.

The direction of gas ejection from the plating nozzle 4 can be adjusted so as to be substantially perpendicular to the steel strip surface by the refraction joint 24, and the interval between the pair of plating nozzles 4 can be adjusted.

Next, the adjustment of the height position of the plating nozzle 4 will be described. FIG. 5 shows an operation diagram for adjusting the height (position in the Z direction) of the plating nozzle 4. For example, the refractive joint 23
Is operated, the height of the plating nozzle 4 can be changed.

The height of the arms 30 and 31 is changed by operating the bending joints 22 and 23,
The height position of the plating nozzle 4 can be adjusted by keeping the nozzle 4 parallel to the steel strip surface and the molten metal bath surface using the method described above. Further, by operating the bending joint 24, the accuracy of the set position of the plating nozzle 4 is improved.

Next, adjustment of the position of the plating nozzle 4 in the steel strip width direction will be described. FIG. 6 shows an operation diagram for adjusting the position (Y-direction position) of the plating nozzle 4 in the steel strip width direction. For example, the bending joint 22 can be operated to change the position of the plating nozzle 4 in the steel strip width direction. In addition, refraction joint 2
By operating the members 2 and 23, the position of the plating nozzle 4 in the steel strip width direction can be changed without changing the height position.

Then, the arm 3 is operated by operating the rotating shaft 21 and the bending joints 22 and 23 of the plating nozzle position adjusting mechanism.
At the same time as changing the Y-direction positions of 0 and 31, the plating nozzle 4 is kept parallel to the steel strip surface and the molten metal bath surface by using the refracting joint 24 and the rotating joint 26, so that the Y-direction position of the nozzle 4 is changed. (Position in the width direction of the steel strip) can be adjusted, and centering becomes possible.

Next, adjustment of the spray angle of the plating nozzle 4 will be described. FIG. 7 is an operation diagram when the injection angle of the plating nozzle 4 is changed. The rotating joint 25 is operated to rotate the arm 29 around the axis, and at the same time, the refraction joint 24 and the rotating joint 26 are used to maintain the parallelism of the nozzle 4 with respect to the steel strip surface and the molten metal surface. Can be changed.

As described above, in the present embodiment, by appropriately operating the joint axes described above, the position of the plating nozzle 4 in the X, Y, and Z directions and the spray angle can be freely changed.

As shown in FIG. 1, in this embodiment,
In the vicinity of the plating nozzle 4, a non-contact deflection of the steel strip 1 in the surface direction (X direction) is detected in a non-contact manner with a steel strip width direction position detection sensor 6 for detecting the position of the steel strip 1 in the width direction (Y direction). A steel strip surface direction vibration detection sensor 7 to be detected is attached. The movement in the width direction (Y direction) and the surface direction (X direction) of the steel strip 1 detected by the steel strip width direction position detection sensors 6 and 7 are sent to the plating nozzle position control device 8 as signals.
A signal corresponding to the movement is calculated, and the driving device of the plating nozzle position adjusting mechanism is moved based on the signal, whereby the position of the plating nozzle 4 with respect to the steel strip 1 can be controlled to be constant.

That is, a means for detecting the vibration of the steel strip is provided in the vicinity of the plating nozzle 4 and the position of the plating nozzle 4 is controlled based on the detected value. The movement corresponding to the deflection in the width direction and the plane direction can be performed.

Next, the maintenance work will be described. FIG. 8 is an operation diagram when the plating nozzle 4 is transferred to the storage trolley 40 during the nozzle replacement operation. As shown in FIG. 8, by appropriately operating each joint axis, the nozzle 4 can be directly transferred to the storage cart 40 without using an external device such as a crane.

That is, since the plating nozzle 4 is supported by the support mechanism having the joint axis, the plating nozzle 4 can be easily moved at the time of nozzle replacement or maintenance by operating the joint axis.

FIG. 9 shows that the plating nozzle 4 is moved to a predetermined working position 41 during maintenance of the plating nozzle 4 or maintenance of equipment in the molten metal bath such as the sink roll 10 and the shape correcting roll 11. It is an operation | movement figure in a case. For simple nozzle maintenance, plating nozzle 4
Can be moved to a predetermined work position 41, maintenance work can be performed without removing the work from the nozzle position adjusting mechanism, and the nozzle 4 can be returned to the operation position immediately after the work. Furthermore, the nozzle 4 can be quickly moved from above the molten metal bath even during maintenance of equipment in the molten metal bath such as the sink roll 10 and the shape correction roll 11. That is, the efficiency of the maintenance work is improved by a simple operation. (Embodiment 2) FIG. 10 shows an example of equipment arrangement when the main bodies 5 of the pair of plating nozzle position adjusting mechanisms are installed on both sides of the steel strip 1. The nozzle position adjusting mechanism is composed of the main body 5 and the bending joint 22.
To 24 and arms 27 to 29.

FIGS. 11 and 12 are operation diagrams when the nozzle interval (nozzle position in the X direction) and the nozzle height (Z direction position) are changed.

By appropriately operating the three joint axes of the bending joints 22 to 24, the nozzle interval and the nozzle height can be freely changed.

FIG. 13 is an operation diagram when the injection angle of the plating nozzle 4 is changed. By operating the refraction joint 24, the ejection angle of the nozzle 4 can be changed.

Therefore, by using the nozzle position adjusting mechanism having the three joint axes 22 to 24, it is possible to change three parameters, which are important in the gas wiping method, such as a nozzle interval, a nozzle height, and a nozzle injection angle.

The plating nozzle position adjusting device of this embodiment is
By adopting the adjusting mechanism including three or more joint axes, the conventional complicated nozzle position adjusting mechanism can be simplified, and the workability of the operator around the molten metal bath can be improved.

Further, by performing centering control of the plating nozzle 4 in the steel strip width direction and distance control between the nozzle and the steel strip surface using the nozzle position adjusting mechanism, the steel strip 1 can be moved in the width direction and the traveling direction. Plating with good plating thickness uniformity can be performed.

At the time of replacement and maintenance of the plating nozzle 4 and the equipment in the molten metal bath, the plating nozzle 4 can be directly moved to the nozzle storage trolley or a predetermined working position by using the nozzle position adjusting mechanism. This simplifies the process and shortens the line stop time, thereby improving the line operation rate and yield, and reducing the energy loss required for holding the heating furnace.

[0056]

According to the present invention, it is possible to obtain a continuous molten metal plating facility, a continuous molten metal plating method, and a position adjusting device of the continuous molten metal plating means which have a simple structure and excellent maintainability. .

[Brief description of the drawings]

FIG. 1 is a side view showing an outline of a plating nozzle position adjusting device of the present invention.

FIG. 2 is a top view showing an outline of a plating nozzle position adjusting device of the present invention.

FIG. 3 is a front view showing an outline of a plating nozzle position adjusting device of the present invention.

FIG. 4 is an operation diagram of a plating nozzle position adjusting device of the present invention.
One.

FIG. 5 is an operation diagram of the plating nozzle position adjusting device of the present invention.
2.

FIG. 6 is an operation diagram of the plating nozzle position adjusting device of the present invention.
3.

FIG. 7 is an operation diagram of the plating nozzle position adjusting device of the present invention.
4.

FIG. 8 is an operation diagram of the plating nozzle position adjusting device of the present invention.
5.

FIG. 9 is an operation diagram of the plating nozzle position adjusting device of the present invention.
6.

FIG. 10 is a front view-2 showing an outline of a plating nozzle position adjusting device of the present invention.

FIG. 11 is an operation diagram -7 of the plating nozzle position adjusting device of the present invention.

FIG. 12 is an operation diagram -8 of the plating nozzle position adjusting device of the present invention.

FIG. 13 is an operation diagram -9 of the plating nozzle position adjusting device of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Steel strip, 2 ... Molten metal bath, 3 ... Molten metal, 4 ... Plating nozzle, 5 ... Plating nozzle position adjusting mechanism main body, 6 ... Steel strip width direction position detection sensor, 7 ... Steel strip surface direction vibration detection sensor, Reference Signs List 8: Plating nozzle position control device, 9: Flexible hose for gas supply, 10: Sink roll, 11: Shape correction roll, 12: Snout, 21: Plating nozzle position adjusting mechanism body rotating shaft, 22 to 24: Refraction joint, 25 , 26
... Rotating joint, 27-31 ... Arm,

Claims (9)

[Claims] 1. A continuous hot-dip metal plating facility provided with a plating thickness control means for continuously plating a molten metal on a steel strip and controlling the plating thickness, wherein the plating thickness control means comprises at least one joint shaft. A continuous hot-dip metal plating facility comprising the provided position adjusting device. 2. A continuous hot-dip metal plating facility comprising a steel strip which is continuously plated with a molten metal and a plating thickness control means for controlling the plating thickness, wherein said plating thickness control means is provided through at least one joint shaft. A continuous hot-dip metal plating facility characterized by supporting 3. A continuous hot-dip metal plating facility provided with a plating thickness control means for continuously plating a molten metal on a steel strip and controlling the plating thickness, wherein the plating thickness control means faces the steel strip surface. A continuous hot-dip metal plating facility, comprising: a position adjusting device provided with three or more joint shafts for each of a pair of gas injection nozzles arranged in a row. 4. A continuous hot-dip metal plating facility according to claim 3, wherein at least one of an interval, a height position, an injection angle, and a position in a steel strip width direction of the pair of gas injection nozzles is adjusted. Continuous hot-dip metal plating equipment equipped with. 5. The continuous molten metal plating equipment according to claim 3, further comprising a control device for controlling a distance between the pair of gas injection nozzles and the steel strip surface. Plating equipment. 6. The continuous hot-dip metal plating equipment according to claim 3, wherein at least one of the joint shafts can rotate the pair of gas injection nozzles in a horizontal plane. Continuous hot metal plating equipment characterized by a rotating joint shaft. 7. The continuous melting metal plating equipment according to claim 3, further comprising a control device for controlling a position in a width direction of said pair of gas injection nozzles with respect to said steel strip. Metal plating equipment. 8. A position adjusting device for a continuous molten metal plating means, comprising: continuously plating a molten metal on a steel strip; and a plating thickness control means for controlling a plating thickness of the steel strip. A position adjusting device for a continuous hot-dip metal plating means, wherein a pair of gas injection nozzles disposed opposite to a belt surface are supported by a support device having three or more joint axes. 9. A method for adjusting the position of a continuous molten metal plating means, comprising continuously plating a molten metal on a steel strip and comprising a plating thickness control means for controlling the plating thickness, wherein the support for supporting the plating thickness control means is provided. A position adjusting method for a continuous hot-dip metal plating means, wherein three or more joint axes of the apparatus are operated to move the position of the continuous hot-dip metal plating means.