JPH08188862A - Cooling device for continuous hot-dip metal coating equipment - Google Patents

Abstract

PURPOSE: To dispense with a large space at the side of the pass line by providing a mechanism which is continuously arranged on the side of an upper cooling zone when a cooling air duct constituting a lower cooling zone is retracted. CONSTITUTION: After the steel strip l is dipped in the molten metal 3 in a molten metal tank 2, the steel strip is fed to an upper cooling zone 7 through a lower cooling zone 10 consisting of cooling air boxes 11a, 11b. When the plating specification is changed, e.g. the alloying equipment is used, the positioning of the cooling air boxes 11a, 11b by a connecting rod 20 is released to separate an air inlet port part of ducts 52a, 52b from an air inlet port part. Elevating equipment 32a, 32b are driven, the cooling air boxes 11a, 11b are hoisted by wire ropes 17a, 17b, to be elevated to the upper waiting position located continuously on each side of an outer shell body of an upper cooling zone 7 along guide rails 25a, 25b. In addition, the alloying equipment is moved to a pass line 4 to achieve the desired alloying treatment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plating facility for heat-treating a steel strip and then immersing it in a molten metal bath to perform continuous plating such as zinc-aluminum alloy plating. Cooling device.

[0002]

2. Description of the Related Art In this type of continuous hot-dip galvanizing equipment, various types of steel strips after immersion in the molten metal are required depending on the type of the plated metal, the appearance of the plated metal layer, and the properties required for alloying. Post-treatment became necessary. Therefore, in the past, the cooling zone above the molten metal tank was divided into two, an upper cooling zone and a lower cooling zone, and the lower cooling zone was moved laterally. It is used along with the temporary placement.

[0003]

However, in the above method, the lower cooling zone, the spangle erasing processing device, the alloying processing device, etc. are all moved laterally from the pass line to the standby position when not in use. Therefore, a large space is required on the side of the pass line, and depending on the type of post-processing, the space on the pass line is required not only on two sides but also on three or four sides. Therefore, it cannot be installed due to interference with other equipment (for example, heat treatment furnace) and the wall surface of the building, and it is extremely difficult to install the post-treatment device in the existing building.

The present invention solves the above-mentioned conventional problems, and aims to provide a cooling device for continuous hot-dip galvanizing equipment in which the installation space is small by retracting the lower cooling zone upward. Is.

[0005]

A cooling device for continuous hot-dip galvanizing equipment according to the present invention is a cooling device that faces a steel strip surface at a use position arranged along a path line of a steel strip rising from the molten metal bath. A cold air box having a wind outlet and forming a lower cooling zone, an upper cooling zone arranged above the lower cooling zone and fixed along the pass line, and the cold air box from the use position to the upper side. A guide for guiding laterally and upwardly to an upper shelter position arranged side by side on the outer shell of the cooling zone and between the use position and the upper shelter position of the cold air box along the guide. And a duct connected to a cold air supply source having an air supply opening at one end that can be connected to and separated from the cold air supply opening of the cold air box at the use position.

[0006]

In the cooling device of the present invention, when the cold air box in the use position is driven by the lifting drive device, the cold air box is guided laterally and upward along the guide,
Reach the upper retreat position, which is arranged side by side on the outer shell side of the upper cooling zone. The cold air box does not need to have a large space on the side of the pass line because it can be moved laterally by a small distance to avoid interference with the outer shell of the upper cooling zone.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the figure, 1 is a steel strip, which is heat-treated by passing through a heat treatment furnace (not shown), immersed in a molten metal (zinc / aluminum alloy in this embodiment) 3 in a molten metal tank 2, and then an upward pass line 4 is applied. To run. Reference numeral 6 denotes a cooling device, which is composed of a lower cooling zone 10 constituted by the cool air boxes 11a and 11b at a use position P shown by a solid line in FIG. 1, and an upper cooling zone 7 arranged above this.

Cold air box 11 (cold air box 11a,
A generic term for 11b. Hereinafter, the other parts will also be collectively referred to. ) Is a box-shaped body that extends in the up-down direction and has a large number of slit-shaped outlets 12 facing the steel strip surface of the steel strip 1 at a use position P, and has a cool wind that opens laterally at the upper end. It has an entrance 13. Further, as shown in FIG. 4, the rollers 15, 16 are attached to the mounting bases 15, 15 fixed to the upper end of the cold air box 11 by the brackets 14.
Is rotatably supported about an axis extending in the horizontal direction, and the lower end of the wire rope 1 is connected to the mounting base 15.
The cold air boxes 11a and 11b are suspended by the 7a and 17b and driven up and down (details will be described later). The cold air box 11 at the use position P has a guide rail 25 (described later).
Roller 16 abutting a stopper 24 fixed to the lower end of the roller 16
Is suspended and held.

Reference numeral 20 designates a connecting rod which is rotatable about a vertical axis 21. The recesses 22a and 22b shown in FIG. 4 are engaged with and disengaged from the lower side end portions 23 of the cold air boxes 11a and 11b. This is for preventing the positional deviation of the cold air box 11. The connecting rod 20 is driven to rotate by a predetermined angle (about 90 degrees) by an air cylinder type driving device (not shown). Instead of the connecting rod 20, a stopper with which the lower end of the cold air box 11 engages or disengages, or both cold air boxes 11a and 11b may be connected to each other by a link.

25a and 25a are a pair of guide rails for guiding the cold air box 11a, and 25b and 25b are a pair of guide rails for guiding the cold air box 11b, both of which are vertically spaced apart from the pass line 4. The linear portion 26 is extended and curved portions 27a and 27b that are connected to the lower end of the linear portion 26 and are curved toward the pass line 4 are provided.
It has a U-shaped cross section for accommodating the la 16 with a small clearance, and is fixed to the floors 28 and 29 of the building by brackets (not shown).

The above wire rope 17a is wound around a deflecting wheel 31a pivotally supported on a frame 30a fixed on the floor 28, and then lifted and lowered 32a installed on the floor 28.
Is wound around the winding drum 33a. 34a is a motor for driving the winding cylinder, and 35a is a deflecting vehicle for avoiding interference with the upper cooling zone 7, and is pivotally supported by a beam 36 fixed to the building.
The wire rope 17b is also driven by a similar device, and is shown by the reference numeral with a subscript b attached to the corresponding portion, and detailed description thereof will be omitted.

Further, as shown in FIG. 5, the upper cooling zone 7 has a partition wall 43 provided with a large number of slit-shaped outlets 42 inside a stepped box-shaped outer shell 41 extending in the vertical direction. The cold air chambers 44a and 44b are provided as the auxiliary cooling zone 45, and the holding zone 46 surrounded by the outer shell 41 is formed on the auxiliary cooling zone 45. The cold air is supplied to the cold air chamber 44 on the floor 28. It is performed by the duct 48 connected to the discharge port of the blower 47. The outer shell 41 is fixedly attached to the beam 36 and the floor 28.

On the other hand, the supply of cold air to the cold air boxes 11a and 11b is carried out by the air ducts 52a and 52b connected to the outlets of the air blowers 51a and 51b provided on the floor 29. As shown in FIGS. 3 and 4, a bellows-shaped expansion joint 53 that expands and contracts in the duct axial direction is attached to the tip of the duct 52, and an air cylinder 54 is provided above and below the duct tip (only the upper side is shown). The air supply port 55 at the end of the expansion joint is driven to approach and separate from the cold air inlet 13 of the cold air box 11. Reference numeral 56 is a linear motion guide that guides the rod 57 attached to the air supply port 55 in a linear direction.

2 and 5, reference numeral 70 denotes an alloying treatment apparatus, which is mounted on a carriage 73 which travels on a rail 72 laid on a support beam 71 fixed to the building.

In the cooling device 6 having the above-described structure, in order to cool the steel strip 1 and the molten metal adhered thereto by using the cold air box 11, as shown in FIGS. 1 and 2, the cold air box 11 is at the lowest position. The cold air blown from the blower 51 is blown into the cold air box 11 from the cold air inlet 13 through the duct 52, and is blown from the blowout port 12 to both sides of the steel strip 1 which is traveling upward. In the upper cooling zone 7, the blower 47 is operated as necessary, and the air outlet 42
Spray cold air from.

Next, when the alloying apparatus 70 is used by changing the plating specifications of the steel strip 1 and the like, the positioning of the cold air boxes 11a and 11b by the connecting rod 20 is released, and the air supply port 55 of the duct 52 is released. When the elevating / lowering drive devices 32a and 32b are operated by separating the cold air inlet 13 from the cold air inlet 13, the cold air boxes 11a and 11b are lifted by the wire rope 17 and lifted laterally and upward along the guide rail 25. When driven, as shown in FIG. 5, the outer shell 4 of the upper cooling zone 7
The upper shelter position Q, which is located in parallel on both sides of 1, is reached.
At this position, the limit switch (not shown) stops the motor 34 of the elevating / lowering drive device 32, and the brake of the motor portion holds the cold air box 11 at the upper retracted position Q.

In this state, for example, a lock device (not shown) of a type in which the rod fixed to the piston rod of the air cylinder provided in the frame 30 is engaged with the hole of the hanging ear fixed to the cold air box 11 is used to cool the wind. Box 1
It is more preferable for safety if 1 is mechanically held.

After the cold air box 11 is moved to the upper retracted position Q as described above, the alloying treatment apparatus 70 is moved to the pass line 4 as shown by the chain line in FIG. 5 to carry out the desired alloying treatment. You can do it. At this time, the upper cooling zone 7
It is also possible to use the entire upper cooling zone 7 as the slow cooling zone or the holding zone without performing the cold air blowing in the case as required. Similarly, a spangle erasing processing device (not shown) or the like can be used by moving it from the side of the pass line to the pass line portion.

In order to return the cold air box 11 to the use position P after using the alloying treatment device 70 or the like, the lifting drive device 32 is used.
It is sufficient that the cold air box 11 is lowered along the guide rails 25 by the reverse operation to return to the state of FIG. 1 and FIG.

As described above, since the cold air box 11 is retracted to the upper position where it moves a small distance laterally with respect to the pass line 4, there is no need for a large space on the lateral side of the pass line 4 and the existing building is In addition, in the case where the alloying treatment apparatus 70 or the like already exists, it is easy to add a new lower cooling zone 10, and the existing lateral refrigerating lower cooling zone is changed to the method of the present invention to change the alloying treatment apparatus. It is easy to install additional post-processing equipment such as.

The present invention is not limited to the above embodiment, and for example, the guide rail 25 has an inclined straight line portion instead of the curved portion 27 and a straight line portion extending in the horizontal direction indicated by an arrow X in FIG. Good. In the above embodiment, the cold air boxes 11a and 11b, which are obtained by dividing the lower cooling zone 10 into the steel strip 1 and divided into two, are provided laterally in the direction orthogonal to the steel strip surface (the arrow X direction in FIG. 4). Since it is moved, it has the advantage that the space required for the evacuation of the outer shell 41 of the upper cooling zone 7 can be small, but as shown by the arrow Y in FIG. The cold air box may be moved laterally in a direction parallel to the plane. In this case, both the cold air boxes 11a and 11b can be integrated, for example, in a U-shaped horizontal cross section, and can be lifted and lowered by a single lift driving device. The air supply port of the air supply duct to the cold air box may be detachably connected to the cold air inlet of the cold air box by an automatic or manual clamp tool or the like.

[0022]

As described above, according to the present invention,
The cool air duct forming the lower cooling zone is guided from the use position below the upper cooling zone to the upper shelter position which is arranged side by side on the outer shell of the upper cooling zone and stands by at that position. Therefore, the space on the side of the outer shell of the upper cooling body can be effectively used, a large space is not required on the side of the pass line, the installation space can be small, and it can be installed in an existing building. It will also be easy to install additional post-treatment devices and lower cooling zones.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a cooling device for continuous hot-dip galvanizing equipment showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG.

FIG. 4 is a partial perspective view showing a guide structure of the cold air box in FIG. 1 and a connection state of ducts.

5 is a longitudinal sectional view (equivalent to FIG. 1) showing a retracted state of the cold air duct in the cooling device of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Steel strip, 2 ... Molten metal tank, 3 ... Molten metal, 4 ... Pass line, 6 ... Cooling device, 7 ... Upper cooling zone, 10 ... Lower cooling zone, 11a ... Cold air box, 11b ... Cold air box, 1
2 ... Discharge port, 13 ... Cold air inlet, 17a ... Wire roll
, 17b ... wire rope, 25a ... guide rail, 2
5b ... Guide rail, 32a ... Elevating / lowering drive device, 32b ...
Lifting / lowering device, 33a ... Winding cylinder, 33b ... Winding cylinder, 34a ...
Motor, 34b ... Motor, 41 ... Outer shell, 45 ... Auxiliary cooling zone, 46 ... Holding zone, 51a ... Blower, 51b ... Blower, 52a ... Duct, 52b ... Duct, 53 ... Expansion joint, 55 ... Air supply port, P ... use position, Q ... upper retracted position.

Claims (1)

[Claims] 1. A cold air box forming a lower cooling zone, having a cold air outlet facing a steel strip surface at a use position arranged along a pass line of a steel strip rising from the molten metal tank, and the lower portion. An upper refrigeration zone arranged above the cooling zone and fixed along the pass line and the cold air box are arranged in parallel from the use position to the outer shell side of the upper cooling zone. Up to a guide for guiding sideways and upwards, a lifting drive device for moving the cold air box along the guide between the use position and the upper retracted position, and cold air feeding of the cold air box in the use position. A cooling device for a continuous hot-dip galvanizing facility, comprising: an inlet having a freely connectable air inlet at one end and a duct connected to a cold air supply source.