JP2778660B2 - Cooling system for steel bars and wires - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for forcibly cooling a bar or wire (hereinafter abbreviated as "wire") on a rolling line.

[0002]

2. Description of the Related Art For the purpose of upgrading and improving the quality of a wire rod, a technique of performing rapid cooling after hot / warm rolling to densify the structure to improve the strength and toughness of the wire rod has been implemented. . A cooling device for that purpose will be described with reference to the drawings.

FIG. 7 is a principle view of a conventional wire rod cooling device. A cooling device 100 has a plurality of holes 102 formed in a cooling pipe 101 having a diameter one or two times larger than a wire rod B, and these holes 102 are formed in a water jacket. It is wrapped with 103, and the air nozzles 104, 104 face the outlet of the cooling pipe 101.

FIG. 8 is a view for explaining the operation of the cooling device shown in FIG.
03 high-pressure water is injected through the hole 102. This water passes between the wire rod B and the cooling pipe 101 and is mostly at the outlet 101a.
Flows out of This water is blocked by high-pressure air and falls. However, the cooling device 100 has a disadvantage that a part of the cooling water flows out from the inlet 101b of the cooling pipe 101. Originally, the cooling start position should be immediately below the hole 102, but if the cooling is partially performed before that, the predetermined cooling management cannot be performed, resulting in uneven cooling. In addition, although the cooling water is blocked by the high-pressure air at the outlet 101a, the cooling water easily falls on the lower surface of the wire B, but the upper surface of the wire B does not easily fall. .

An improved device of the above device 100 is disclosed in
No. 58207, “Immersion cooling pipe for wires and steel bars”, which closes the entrance and exit of the cooling pipe with a so-called water jet. An apparatus similar to this cooling pipe will now be described. FIG. 9 is a diagram showing the principle of a conventional improved cooling device.
07, an ordinary hole 108 is opened at the center side of these, and these inclined nozzles 106, 107 and the hole 108 are surrounded by an inlet jacket 109 and an outlet jacket 111. A drain hole 112 is formed substantially at the center in the longitudinal direction. High-pressure water is sprayed from the inclined nozzles 106 and 107 facing each other to collect water inside the cooling pipe 105, and the wire B is cooled with the water. The cooling water is supplied to the central outlet 112
To keep balance.

[0006]

However, even in the above-described improved cooling device, air bubbles easily accumulate in the upper portion of the inside of the cooling pipe 105. When the bubbles accumulate, the upper and lower surfaces of the wire B are not evenly cooled. If the drainage from the central drainage hole 112 is insufficient, a part of the cooling water is drawn by the wire B and flows out. Then, the wire B is excessively cooled by the water on the upper surface, and uneven cooling occurs on the upper and lower surfaces. Furthermore, drain holes 11
Since the liquid discharged from 2 is easier to flow in the lower part than in the upper part, the lower part of the wire is sufficiently cooled, so that uneven cooling is likely to occur. Therefore, an object of the present invention is to provide a cooling device that can eliminate uneven cooling and air pockets.

[0007]

According to the present invention, there is provided a gas injection ring, a gas-liquid separation member,
The liquid ejecting rings are arranged in this order.
Specifically, the gas injection ring surrounds the wire and generates at least an upward gas flow along the wire, and the liquid injection ring surrounds the wire, cools the wire with the spray liquid, and drops the liquid downward. The gas-liquid separation member has an opening for receiving a falling liquid on an upper surface, receiving an upward gas flow on a lower surface, and generating a gas dome for passing a wire and supporting the falling liquid with gas in the center.

[0008]

The gas is blown up at the opening of the gas-liquid separation member, and the gas is used to support the falling liquid. This portion is called a gas dome, and forced cooling of the wire is performed between the gas dome and the outlet of the liquid injection ring. There is no cooling unevenness, and there is no fear that air or the like will escape upward and the air will accumulate because the liquid jet ring is vertically oriented.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of reference numerals.
FIG. 1 is a diagram showing an example of the arrangement of a wire rod cooling device according to the present invention. The wire rod B is turned upward from horizontal by a lower roll Rb.
Are forcibly cooled by the cooling devices 1 of the present invention (... denotes a plurality, and in this figure, four cooling devices 1 are vertically arranged), and then reaches the upper roll Rt.

FIG. 2 is a cross-sectional view of a cooling device for a wire rod according to the present invention. The cooling device 1 of the present invention, which is a so-called vertical device for cooling a wire rod B moving vertically from bottom to top, moves from bottom to top. , A gas injection ring 2, a gas-liquid separation cone 10 as a gas-liquid separation member, and a liquid injection ring 12. The gas injection ring 2 forms a container with the inner cylinder 3 and the outer cylinder 4, and opens the lower nozzle 5 and the upper nozzle 6 in the inner cylinder 3,
Further, gas supply pipes 7, 8 are attached to the outer cylinder 4,
The inner diameter of the inner cylinder 3 is larger than the outer diameter of the wire rod B by a predetermined dimension.
The gas-liquid separation cone 10 has an opening 11 at the upper end, and in the present embodiment, is a simple conical cone with a small diameter at the top and a large diameter at the bottom. The cone 10 is a member that separates liquid and gas by receiving a liquid such as water on the upper surface 10a and receiving a gas such as air on the lower surface 10b, as will be described later in the section of the operation. Called. The liquid injection ring 12
A container is formed by the inner cylinder 13 for cooling and the outer cylinder 14, a nozzle 15 and an inclined nozzle 16 are opened in the inner cylinder 13 for cooling, and a liquid supply pipe 17 is attached to the outer cylinder 14. This cooling inner cylinder 13 is characterized in that the lower inlet 13a has a relatively large diameter and the upper outlet 13b has a small diameter.

FIG. 3 is a perspective view of the wire rod cooling device of the present invention, in which a gas-liquid separation cone 10 is disposed so as to cover the lower gas injection ring 2, and a liquid injection ring 12 is disposed above the cone 10. Is done. And gas injection ring 2
Hoses 21 and 22 are connected to the gas supply pipes 7 and 8, respectively, and a hose 23 is connected to the liquid supply pipe 17 of the liquid ejection ring 12.
Gases such as compressed air and nitrogen gas are supplied by the hoses 21 and 22, and coolants such as water, coolant and oil are supplied by the hose 23.

The operation of the wire cooling device having the above configuration will be described below. FIGS. 4A to 4C are explanatory views of the operation of the cooling device of the present invention. Although (a) and (b) are described for ease of explanation, (c) is actually the main operation diagram. (A) shows the case where only the gas is supplied without supplying the liquid. After the gas G is stored in the gas injection ring 2, it is ejected from the upper nozzle 6 and the lower nozzle 5 thereof, and the inlet of the inner cylinder is opened. 3a and exit 3b,
In particular, the gas from the outlet 3b rises and the gas-liquid separation cone 10
Blows out further from the opening 11. (B) shows a case where only the liquid is supplied without supplying the gas, and the liquid W is accumulated in the liquid ejecting ring 12 and then ejected from the hole 15 and the inclined nozzle 16 into the cooling inner cylinder 13. I do. The inclined nozzle 16 generates a downward component force, and the entire amount thereof flows out from the lower inlet 13 a because the liquid W falls by gravity, and most of the liquid W reaches the vicinity of the opening 11 of the gas-liquid separation cone 10.

FIG. 3C shows a case in which the gas G and the liquid W are supplied together. The gas G blows up from below the gas-liquid separation cone 10 and the liquid W falls from above. Then, the gas dome 2 as shown in the figure near the opening 11 of the gas-liquid separation cone 10
4 can be done. As a result, the falling liquid W flows along the upper surface 10a of the gas-liquid separation cone 10, and conversely, the gas G flows along the lower surface 10b of the gas-liquid separation cone 10. Therefore, the cooling of the wire rod B moving upward from the bottom is started at the position of the gas dome 24, and the cooling is ended at the outlet 13 b of the liquid jet ring 12. The liquid W filling the cooling inner cylinder 13 of the liquid injection ring 12 is basically at the same level as the outlet 13b. However, even if the liquid leaks from the outlet 13b due to excessive supply, the liquid remains in the liquid state. Since it immediately flows down through the upper surface of the injection ring 12, the liquid level does not substantially increase. Further, since the cooling inner cylinder 13 is vertically oriented, the air that has entered the inside thereof rises and is efficiently discharged from the upper outlet 13b. Therefore, there is no possibility that gas such as air may accumulate inside the cooling inner cylinder 13.

FIGS. 5A to 5C are views showing a modification of the gas injection ring of the present invention.
Had a cylindrical appearance, but is not limited to this.
The upper cone of (a) may be a lower cylinder, and the truncated cone of (b) may be used. Further, as shown in (c), the inner cylinder is abolished, and instead, pressure adjusting mechanisms 26 such as valves are provided. In other words, it is sufficient that a predetermined amount of gas is blown upward so as to surround the wire rod B.

FIGS. 6A to 6D are views showing a modification of the gas-liquid separation member of the present invention, and FIG.
Is a simple cone, but is not limited to this.
The upper cylinder of (a) may be a lower cone, the upper cone of (b) may be a lower cylinder, (c) a dome shape, or (d) a cylindrical shape. And an upper surface 10a for receiving the liquid and a lower surface 10b for receiving the gas.

The shape of the liquid ejecting ring 12 is also arbitrary. In particular, it is preferable to make the upper surface a conical surface so that the overflowed liquid can be discharged quickly. The liquid jet ring 12 has a small-diameter outlet 13b and a large-diameter inlet 13a.
It is also characterized in that the cooling liquid is positively dropped from the large-diameter inlet 13a and the liquid is prevented from flowing out from the small-diameter outlet 13b as much as possible.

In this embodiment, the wire is run from bottom to top. However, the wire may be run from top to bottom.
Further, the cooling device 1 of the present invention may be used alone or in plural sets (see FIG. 1). When arranging a plurality of sets, it is also possible to combine cooling apparatuses 1 having the same shape or to combine cooling apparatuses 1 having different sizes and shapes.

[0018]

As described above, according to the present invention, a wire is run vertically, and a cooling process is performed by a gas injection ring, a gas-liquid separation member and a liquid injection ring arranged in order from bottom to top. Blow up gas at the opening of the separation member,
This gas was used to support the falling liquid, and forced cooling of the wire rod was performed between the gas dome generated there and the outlet of the liquid injection ring, so the start and end points of cooling became clear and good. The forced cooling can be performed. Further, since there is no unnecessary water loading, there is no cooling unevenness, and since the liquid ejecting ring is vertically oriented, there is no fear that air or the like escapes upward and air accumulates, and a high-quality coolant can be obtained.

[Brief description of the drawings]

FIG. 1 is a layout example of a wire rod cooling device according to the present invention.

FIG. 2 is a cross-sectional view of a wire rod cooling device according to the present invention.

FIG. 3 is a perspective view of a wire rod cooling device according to the present invention.

FIG. 4 is a diagram illustrating the operation of the cooling device of the present invention.

FIG. 5 is a view showing a modification of the gas injection ring.

FIG. 6 is a view showing a modification of the gas-liquid separation member of the present invention.

FIG. 7 is a principle diagram of a conventional wire rod cooling device.

FIG. 8 is an operation explanatory view of the cooling device of FIG. 7;

FIG. 9 is a principle diagram of a conventional improved cooling device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Cooling device of wire rod (cooling device of steel bar and wire rod), 2 ... Gas injection ring, 3 ... Inner cylinder, 4 ... Outer cylinder, 7, 8 ... Gas supply pipe, 10 ... Gas-liquid separation member (Gas-liquid separation cone) ), 10a ...
Upper surface of gas-liquid separation member, lower surface of gas-liquid separation member, 1b
DESCRIPTION OF SYMBOLS 1 ... Opening of gas-liquid separation member, 12 ... Liquid jet ring, 13
... inner cylinder for cooling, 14 ... outer cylinder, 17 ... liquid supply pipe, B ... wire rod / steel bar, G ... gas, W ... liquid.

Claims (1)

(57) [Claims] 1. A cylindrical cooling device for running a high-temperature steel bar or wire rod in a vertical direction and forcibly cooling in the middle thereof.
The cooling device includes a gas injection ring that surrounds the bar and wire and generates at least an upward gas flow along the bar and wire, and a bar and bar that is disposed above the gas injection ring and surrounds the bar and wire. A liquid ejecting ring that cools the wire with the ejected liquid and drops the liquid downward, receives the dropped liquid on the upper surface, receives an upward gas flow on the lower surface,
A gas-liquid separation member having an opening for generating a gas dome for passing a steel bar or a wire rod in the center and supporting a falling liquid with gas, and the gas injection ring, the gas-liquid separation member, and the liquid injection ring from bottom to top A bar and wire rod cooling device, which is arranged in the following order.