JPS63223120A - Cooling device - Google Patents

Abstract

PURPOSE:To uniformly cool a bar-shaped steel stock from the upper and lower sides, by spouting a refrigerant through a nozzle in the lower part of a moving steel stock so as to cool the lower part of the steel stock and also by catching the spouted refrigerant with a cover and allowing it to flow downward so as to cool the upper part of the steel stock at the time of cooling a high-temp. bar-shaped steel stock. CONSTITUTION:While high-temp. bar-shaped steel stocks 2 after rolling are moved in the direction of an arrow by means of conveyance rollers 10, a refrigerant such as cooling water, etc., is spouted through a cooling nozzle 20 provided in the direction perpendicular to the direction of advance of the steel stocks 2 in the lower part of the steel stocks 2 so as to cool the lower sides of the steel stocks 2. The refrigerant spouted through the stocks 2 collides against the upper wall part 40a of the internal surface of an inverted U-shaped cover body 40 disposed in the upper part and then flows down along a hanging wall part 40b and drops on the upper surfaces of the bar-shaped steel stock 2 to cool them. By cooling the steel stocks 2 with the refrigerant from the upper and lower sides as mentioned above, uniform cooling can be carried out and the occurrence of deformation such as distortion, warpage, etc., in the steel stocks 2 owing to uneven cooling can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a cooling device that is applied to a heat treatment furnace or the like and cools heated steel materials.

(Prior art and its problems) The process of cooling heated steel is an important process in giving desired composition and properties to steel, for example in heat treatment. in case of,
For example, cooling water is injected onto the surface of the steel material 2 heated in the cooling chamber 1d of the heat treatment furnace 1 as shown in FIG. 6 to cool the steel material. More specifically, the heat treatment furnace 1 is composed of a charging table 1a, a preheating chamber 1b, a cooling chamber 1d for the furnace body IC1, and an extraction table le, and the steel materials 2 to be heat treated are sequentially placed and charged on the charging table 1a. After being heated to a required temperature in the preheating chamber 1b and the furnace IC, and cooled in the cooling chamber 1d, it is extracted and transported from the extraction table 1e. Cooling of the steel material in this cooling chamber 1d is achieved by, for example, arranging a cooling nozzle in a direction perpendicular to the feeding direction of the steel material to be cooled,
Cooling water is jetted out from this cooling nozzle to cool the steel material. When cooling is performed with this cooling nozzle,
There may be positional unevenness in the amount of cooling water jetted out, or the jetted cooling water may scatter, causing some locations to be sufficiently cooled and others not, resulting in uneven cooling and cooling. There is a problem that thermal distortion occurs in the steel material, causing the steel material to warp or bend. When warping or bending occurs in the cooled steel material, it takes time and effort to straighten the steel material, which is one of the factors that causes an increase in manufacturing costs.

The present invention has been made to solve such problems, and provides a cooling device that uniformly cools heated steel materials such as bars using a refrigerant such as cooling water, and prevents thermal distortion due to cooling. The purpose is to

(Means for Solving the Problems) In order to achieve the above-mentioned object, according to the present invention, a cooling nozzle disposed below the steel material to be cooled in a direction perpendicular to the feeding direction of the steel material. In a cooling device that cools the steel material by spouting a refrigerant upward, above and parallel to the cooling nozzle, there is a convex shape in an upwardly cross-sectional shape that receives the refrigerant spouted by the cooling nozzle and causes it to drip onto the surface of the steel material. Provided is a cooling device characterized in that a cover body is provided.

(Function) The refrigerant spouted up from the cooling nozzle is caught by the cover body, which is convex upward in cross section, and is not scattered.Then, the caught refrigerant drips downward from the side edge of the cover body, and is absorbed by the cover body. It falls onto the surface of the steel material passing below and is cooled at the location where the cover body is installed.

(Example) Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 is a side view of a cooling device installed in a cooling chamber of a heat treatment furnace, etc., and FIG. 2 is a front sectional view taken along the arrow line ■-■ in FIG. The rod 2 is the first
The cooling nozzle 20 and cover body 40 of the cooling device according to the present invention, which are being transported at a predetermined speed in the direction of the arrow in the figure, are moved in a direction parallel to each roller axis of the transport roller 1o, that is, the bar 2
The cooling nozzle 20 is disposed below the bar 2 being conveyed, and the cover body 40 is disposed above it in a direction perpendicular to the feeding direction (hereinafter, unless otherwise specified, this is simply referred to as the "width direction"). has been done. Then, the cooling nozzle 20 and the cover body 4
The rollers 0 have substantially the same length as the width of the roller 10, and are arranged horizontally and opposite each other at the same position with respect to the feeding direction of the bar 2.

The type, size, etc. of the cooling nozzle 20 are not limited as long as the cooling nozzle 20 jets a coolant, such as cooling water, upward so as to form a uniform wall of cooling water in the width direction. Figure 5 shows
5 is a sectional view showing an example of a cooling nozzle 20, in order to uniformly jet cooling water from two slit-shaped nozzle holes 21 and 21 extending along the left and right side edges (in FIG. 5) in the width direction. The conduit has a triple structure. That is, the cooling nozzle 20 includes an innermost tube 22, a second conduit 23 on the outer circumference of the innermost tube 22, and a third conduit 24 arranged concentrically with each other on the outer circumference of the innermost tube 22. A cooling water passage 26 a is defined between the inner circumferential walls of the second conduit 23 , and a cooling water passage 26 b is defined between the outer circumferential wall of the second conduit 23 and the inner circumferential wall of the third conduit 24 .

A slit 22a is provided at the bottom of the innermost tube 22 to allow the cooling water to flow out in the axial direction. The second conduit 23 has a slit 22a in the innermost tube 22 at its top.
A slit 23a extending in the axial direction is bored in the same manner. Similarly, the third conduit 24 is provided with a slit 24a at its lowest portion.

Reference numeral 25 in FIG. 5 indicates the third conduit 24 of the cooling nozzle 20.
It is the outermost tube that surrounds the outer periphery of the pipe over the entire width direction and defines a cooling water passage 26C with the outer peripheral wall of the third conduit 24, and supplies the cooling water to the left and right nozzles through the cooling water passage 26c. Guided to hole 21.21. The outermost tube 25 is formed in its lower half, has a curved surface section 25a having an arc-shaped cross section concentric with the third conduit 24, and extends upward from the left and right side edges of the curved surface section 25a, and connects the cooling nozzle 20 along the way. The guide plates 25b, 25b are bent and extended slightly diagonally upward toward the center side, and the guide plates 25b extend vertically upward in a substantially tangential direction from the outer circumferential wall of the third conduit 24, and the upper edges thereof extend along the width direction. Left and right inner guide plates 25c, 25c, which are parallel to the guide plate 25b with a slight distance and define the passage with the guide plate 25b, have open ends to form the nozzle hole 21, and left and right inner guide plates. 2
A support plate 2 is placed between 5c and 25c to support them.
5d, each nozzle hole 21 opens obliquely upward toward the center of the cooling nozzle 20, and injects cooling water aiming at substantially the same outer surface portion of the bar 2 passing above. It looks like this.

Except for both ends of the innermost pipe 22, the other conduit pipes 23, 24 and both ends of the outermost pipe 25 are closed, and one end of the innermost pipe 22 has one end of the cooling water pipe 28 closed, as shown in FIG. One end of the cooling water pipes 29 is connected to each end, and the cooling water pipes 28 and 2
The other ends of the pipes 9 join together and are connected to a pipe 30 communicating with a cooling water storage tank. Valves 32 to 34 for adjusting the amount of cooling water are disposed in the middle of each of the pipes 28 to 30, respectively.

The cover body 40 has an upwardly convex, generally inverted U-shaped groove in cross-section, extends in the width direction, and has an upper wall portion 40a;
The cover body 40 is made up of hanging wall parts 40b, 40b that hang down both side edges of the upper wall part 40a over the entire width direction, and as described above, the cover body 40 is supported by a support member (not shown) at a predetermined position above the cooling nozzle 20. ing. In addition, the cover body 40
The width of the upper wall portion 40a, the wall height of the hanging wall portion 40b, etc. are appropriately determined depending on the distance from the cooling nozzle 20, the required width of the area to be cooled by colliding cooling water against the bar 2, etc. You can set it to

Next, the operation of the device of the present invention will be explained.

First, the valves 32 to 32 installed in the cooling water pipes 28 to 30
When cooling water is supplied into the innermost pipe 22 from both ends of the innermost pipe 22 by opening the valve 34 to an appropriate degree, the cooling water flows through the slit 22a.
It flows out equally into the left and right passage spaces 26a. This outflowing cooling water ascends the passage 26a along the outer wall of the innermost pipe 22, and evenly flows out from the slit 23a of the second conduit 23 into the left and right passage spaces 26b. And the left and right passages 26
b, flows out equally from the slot 7) 24a of the third conduit 24 to the left and right passages 26c, ascends the left and right passages 26c, and is guided to the nozzle holes 21.21. In this way, the cooling water flows from both ends of the innermost pipe 22 through the triple conduits 22 to 24.
Since it is guided to the nozzle hole 21.21 through the nozzle hole 2
1.21 The cooling water spouted from the left and right nozzle holes 21.
The liquid can be ejected evenly from 21 and evenly in the width direction.

A portion of the cooling water squirted diagonally upward from the nozzle holes 21, 21 collides with the lower surface of the bar 2 being conveyed by the conveying roller 10, thereby sequentially cooling the bar 2 from the lower surface. On the other hand, the remaining cooling water that did not collide with the bar 2 is further blown upward. This remaining cooling water is received by the cover body 40 and prevented from scattering, and the cover body 40
Most of the cooling water that collided with the wall 40a flows along the inner wall surfaces of the earthen wall 40a and the hanging wall 40b, and the cooling water collides with the wall 40b.
A portion of the six drops of cooling water dripping downward from the lower edge of the bar 2 falls onto the bar 2 being conveyed and cools it from the upper surface. At this time, the position where the cooling water falls onto the bar 2 is not far away from the position where the lower surface of the bar 2 is cooled by the cooling nozzle 20, and the cover body 40 prevents the cooling water from scattering. The second cooling position can be limited to required positions.

In the above-mentioned embodiment, the cover body 40 has a groove shape with an inverted U-shape in cross section, but the cross-sectional shape of the cover body 40 is not limited to this. Various shapes can be used as long as they have a shape that can prevent the problem. For example, a chevron-shaped cross-sectional shape having an upwardly convex shape as shown in FIG. 4 may be used.

Further, the number of pairs of cooling nozzles 20 and cover bodies 40 arranged in the direction of feeding the steel material is not limited to one, and may be appropriately arranged as required.

(Effects of the Invention) As described in detail above, according to the cooling device of the present invention, a cross section is provided above and parallel to the cooling nozzle that receives the refrigerant spouted by the cooling nozzle and causes it to drip onto the surface of the steel material. Since the convex cover body is placed above, the cooling water spouted up by the cooling nozzle does not scatter freely.
Although the cooling position of the steel material is limited, the steel material can be cooled uniformly from the bottom and top surfaces, and the occurrence of thermal distortion can be suppressed by cooling the steel material, and bending and warping of the steel material can be prevented. .

[Brief explanation of drawings]

FIG. 1 is a partially sectional side view of a cooling device according to the present invention, and FIG.
The figure is a cross-sectional front view taken along arrow m-n in FIG. 1, FIG. 3 is a perspective view of a cover body 40 according to the present invention, and FIG. 4 is a perspective view showing another aspect of the cover body according to the present invention. 5 is a cross-sectional configuration diagram of the cooling nozzle 20 taken along the arrow line V-V in FIG. 2, and FIG. 6 is a block diagram showing the configuration of a heat treatment furnace to which the cooling device of the present invention is applied. 1... Heat treatment furnace, 1d... Cooling chamber, 2... Bar material (
steel material), 10... Conveyance roller, 20... Cooling nozzle, 21... Nozzle hole, 40... Cover body.

Claims (1)

[Claims] In a cooling device that cools the steel material, a cooling nozzle is disposed below the steel material to be cooled and is disposed perpendicular to the feeding direction of the steel material, and a refrigerant is ejected upward from the cooling nozzle. receiving the refrigerant spouted by the cooling nozzle and causing it to drip onto the surface of the steel material;
A cooling device characterized in that a convex cover body is disposed above the cross section.