JP3401974B2 - Cooling equipment for continuous hot metal plating equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plating apparatus for subjecting a steel strip to heat treatment and then immersing it in a molten metal bath to perform continuous plating, for example, zinc-aluminum alloy plating. And a cooling device for cooling the steel strip after immersion. 2. Description of the Related Art In a continuous hot-dip plating apparatus of this kind, a steel strip immersed in a molten metal is immersed in accordance with requirements such as the type of plating metal, the appearance of a plating metal layer, and the improvement of properties by alloying. On the other hand, various post-treatments have been required. Therefore, conventionally, the cooling zone above the molten metal bath is divided into an upper cooling zone and a lower cooling zone, and the lower cooling zone is moved to the side, and a spangle elimination device or an alloying device is used instead of a pass line. It is used along with temporary placement. In the above method, however, the lower cooling zone, the spangle elimination device, the alloying device, and the like are all laterally moved from the pass line to the refuge when not in use. Because it was made to wait at the position, a large space was required on the side of the pass line, and depending on the type of post-processing, the space on the side of the pass line was not limited to two but three or four sides. This makes it impossible to install the equipment because it interferes with other equipment (for example, a heat treatment furnace) or the wall surface of the building, and it is extremely difficult to install an additional post-processing device especially in an existing building. SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and aims to provide a cooling device for a continuous hot-dip metal plating facility which requires a small installation space by retracting a lower cooling zone upward. It is. SUMMARY OF THE INVENTION A cooling apparatus for a continuous hot-dip metal plating facility according to the present invention is provided on a surface of a steel strip at a use position arranged along a pass line of a steel strip rising from the inside of a molten metal tank. A cold air box comprising an opposing cool air outlet, forming a lower cooling zone, an upper cooling zone arranged above the lower cooling zone and fixed along the pass line, and moving the cold air box from the use position. A guide that guides sideways and upwards to an upper retreat position arranged side by side on the outer shell body side of the upper cooling zone, and the use position and the upper retreat position of the cold air box along the guide. And a duct connected to a cold air supply source having an air supply port at one end that can be connected to and separated from the cold air inlet of the cold air box at the use position. It is characterized by. In the cooling device according to the present invention, if the cool air box at the use position is driven by the lifting drive, the cool air box is guided sideways and upward along the guide,
The upper cooling zone reaches an upper retreat position arranged side by side on the outer shell body side. The cool air box need only be moved to the side by a small distance so as to avoid interference with the outer shell of the upper cooling zone, so that a large space is not required beside the pass line. An embodiment of the present invention will be described below with reference to FIGS. In the figure, reference numeral 1 denotes a steel strip, which is heat-treated by passing through a heat treatment furnace (not shown), immersed in a molten metal (a zinc-aluminum alloy in this embodiment) 3 in a molten metal tank 2, and passed through an upward pass line 4. To run. Reference numeral 6 denotes a cooling device, which comprises a lower cooling zone 10 constituted by cold air boxes 11a and 11b at a use position P indicated by a solid line in FIG. 1, and an upper cooling zone 7 disposed above the lower cooling zone. The cool air box 11 (the cool air box 11a,
Generic term for 11b. Hereinafter, the other parts are also collectively referred to. ) Is a vertically extending box-like body having a plurality of slit-shaped outlets 12 facing one side of the steel strip surface of the steel strip 1 at the use position P, and has a cold air opening laterally at the upper end. An inlet 13 is provided. Further, as shown in FIG. 4, mounting bases 15, 15 fixed to the upper end of the cool air box 11 by brackets 14 have rollers 16, 16 mounted thereon.
Is rotatably supported about an axis extending in the horizontal direction, and has a lower end connected to the mounting base 15.
The cold air boxes 11a and 11b are suspended and driven up and down (details will be described later) by 7a and 17b. The cool air box 11 at the use position P is provided with a guide rail 25 (described later).
Roller 16 in contact with a stopper 24 fixed to the lower end of the roller 16
Is suspended. Reference numeral 20 denotes 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 end portions 23 of the cool air boxes 11a and 11b. This is for preventing the displacement of the cool air box 11. The connecting rod 20 is turned 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 cool air box 11 is disengaged may be used, or the cool air boxes 11a and 11b may be connected to each other by a link. Reference numerals 25a and 25a denote a pair of guide rails for guiding the cold air box 11a, and reference numerals 25b and 25b denote a pair of guide rails for guiding the cold air box 11b. A linear portion 26 extending from the lower end of the linear portion 26 and curved portions 27a and 27b curved toward the pass line 4;
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-mentioned wire rope 17a is wound around a deflecting wheel 31a pivotally supported on a frame 30a fixedly mounted on the floor 28, and then is moved up and down by a lifting drive 32a mounted on the floor 28.
Is wound around the winding drum 33a. 34a is a motor for driving the winding drum, and 35a is a deflecting wheel for avoiding interference with the upper cooling zone 7, and is supported by a beam 36 fixed to the building.
The wire rope 17b is also driven by a similar device, and corresponding parts are denoted by reference numerals with a subscript b, and detailed description is omitted. As shown in FIG. 5, the upper cooling zone 7 has a partition wall 43 provided with a number of slit-shaped outlets 42 in a stepped box-shaped outer shell 41 extending in the vertical direction. The cooling air chambers 44a and 44b are provided to form an auxiliary cooling zone 45, and a holding zone 46 surrounded by an outer shell 41 is formed on the auxiliary cooling zone 45. The supply of the cold air to the cooling air chamber 44 is provided on the floor 28. This is performed by a 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 cool air to the cool air boxes 11a and 11b is performed by blow ducts 52a and 52b connected to the discharge ports of the blowers 51a and 51b provided on the floor 29. As shown in FIGS. 3 and 4, a bellows-like expansion joint 53 that expands and contracts in the duct axis direction is attached to the distal end of the duct 52, and is provided by air cylinders 54 provided above and below the duct distal end (only the upper side is shown). The air supply port 55 at the distal end of the expansion joint is driven toward and away from the cool air inlet 13 of the cool air box 11. Reference numeral 56 denotes a linear motion guide for guiding a 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 running on a rail 72 laid on a support beam 71 fixed to a building. To cool the steel strip 1 and the molten metal adhered thereto using the cold air box 11 in the cooling device 6 having the above structure, the cold air box 11 is moved to the lowermost position as shown in FIGS. The cool air blown from the blower 51 is sent into the cool air box 11 from the cool air inlet 13 through the duct 52, and is blown from the outlet 12 to both surfaces of the steel strip 1 running upward. In the upper cooling zone 7, the blower 47 is operated if necessary,
Blow cold air from Next, when using the alloying apparatus 70 due to a change in the plating specification of the steel strip 1, the positioning of the cool air boxes 11 a and 11 b by the connecting rod 20 is released, and the air supply port 55 of the duct 52 is released. When the elevators 32a and 32b are operated while separating the cooling air inlet 13 from the cold air inlet 13, the cold air boxes 11a and 11b are lifted by the wire rope 17 and rise sideways and upward along the guide rails 25. The outer shell 4 of the upper cooling zone 7 is driven as shown in FIG.
1 reaches an upper retreat position Q which is located in a side-by-side relationship on both sides.
At this position, the motor 34 of the lifting drive 32 is stopped by a limit switch (not shown), and the cool air box 11 is held at the upper retract position Q by the brake of the motor. In this state, for example, a lock device (not shown) such as a type in which a rod fixed to a piston rod of an air cylinder provided in the frame 30 is engaged with a hole of a suspension lug fixed to the cool air box 11 is used. Box 1
It is more preferable from the viewpoint of safety to hold 1 mechanically. After the cold air box 11 is moved to the upper retract position Q as described above, the alloying apparatus 70 is moved to the pass line 4 as shown by the dashed line in FIG. You can do it. At this time, the upper cooling zone 7
The blowing of the cold air in the above can be performed as necessary, and the entire upper cooling zone 7 can be used as a slow cooling zone or a holding zone. Similarly, a spangle erasing device (not shown) can be used by moving from the side of the pass line to the pass line portion. In order to return the cool air box 11 to the use position P after using the alloying apparatus 70 or the like, the lifting drive 32
Can be reversed to lower the cool air box 11 along the guide rail 25 to return to the state shown in FIGS. As described above, since the cold air box 11 is retracted to the upper position moved to the side by a small distance with respect to the pass line 4, a large space is not required on the side of the pass line 4, and the existing building is not required. In the case where the alloying treatment device 70 or the like is already installed, it is easy to additionally install a new lower cooling zone 10, and the existing side-retractable lower cooling zone is changed to the method of the present invention, and the alloying treatment device Such an additional post-processing device can be easily installed. The present invention is not limited to the above-described embodiment. For example, the guide rail 25 may have an inclined straight portion or a straight portion extending in the horizontal direction indicated by an arrow X in FIG. Is also good. Further, in the above embodiment, the cold air boxes 11a and 11b obtained by dividing the lower cooling zone 10 into two parts on the left and right sides of the steel strip 1 are laterally arranged in a direction perpendicular to the steel strip surface (the direction of arrow X in FIG. 4). Since the moving member is moved, the space required for the side of the outer shell 41 of the upper cooling zone 7 can be reduced, which is advantageous. However, as shown by an arrow Y in FIG. The cold air box may be moved laterally in a direction parallel to the plane. In this case, both cold air boxes 11a and 11b may be integrated into, for example, a U-shape in horizontal section, and may be driven up and down by one lifting and lowering drive device. Further, 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. As described above, according to the present invention,
The cold air duct constituting the lower cooling zone is guided from the use position below the upper cooling zone to the upper retreat position arranged in parallel on the side of the outer shell of the upper cooling zone, and stands by at this position. Therefore, the space on the side of the outer shell of the upper cooling body can be used effectively, and there is no need for a large space on the side of the pass line. It is easy to additionally install a post-processing device and a lower cooling zone.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of a cooling device for a continuous hot-dip metal plating facility showing one embodiment of the present invention. FIG. 2 is a sectional view taken along line AA of FIG. FIG. 3 is a sectional view taken along line BB of FIG. 1; FIG. 4 is a partial perspective view showing a guide structure of a cold air box and a connection state of a duct in FIG. FIG. 5 is a longitudinal sectional view (corresponding to FIG. 1) showing a retracted state of the cool air duct in the cooling device of FIG. 1; [Description of Signs] 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 wire
17b: wire rope, 25a: guide rail, 2
5b: guide rail, 32a: lifting drive, 32b ...
Elevating drive device, 33a ... winding cylinder, 33b ... winding cylinder, 34a ...
Motor, 34b motor, 41 outer shell, 45 auxiliary cooling band, 46 holding band, 51a blower, 51b blower, 52a duct, 52b duct, 53 expansion joint, 55 ... Air supply port, P: use position, Q: upper retract position.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) C23C 2/00-2/40

Claims (1)

(1) A cold air outlet facing a steel strip surface at a use position disposed along a pass line of the steel strip rising from the molten metal tank, and a lower cooling zone. A cold air box, an upper cooling zone arranged above the lower cooling zone and fixed along the pass line, and the cold air box is moved from the use position to an outer shell of the upper cooling zone. A guide that guides laterally and upward to an upper retreat position arranged in parallel, an elevating drive device that moves the cold air box between the use position and the upper retreat position along the guide, A cooling device for a continuous hot-dip metal plating facility, comprising: a cooling air supply inlet of the cold air box at a use position;