JP2007284764A - Facility for cooling loose coil, and cooling method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a facility for cooling a loose coil so as to reduce a nonuniformity of the strength of a steel wire in a longitudinal direction, by improving a cooling rate for edge parts in a width direction of the loose coil, which are cooled by a cooling medium in a cooling tank, and reducing the nonuniformity of a cooling rate in a width direction of the loose coil. <P>SOLUTION: The cooling tank 2 has a spouting nozzle 6 and a suction part 7 installed therein. The spouting nozzle 6 spouts a molten salt 3 to the edge parts 101 in the width direction of the loose coil 4 to improve the cooling rate at the edge parts 101 of the loose coil 4. The cooling method includes adjusting the cooling rate by controlling the flow rate and temperature of the molten salt 3 spouted out through the spouting nozzle 6 with the use of a pump 9 and a circulation circuit of a cooling apparatus 11, and thereby reducing the nonuniformity of the cooling rate in the width direction of the loose coil 4 to reduce the nonuniformity of the strength in the longitudinal direction of the steel wire. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a loose coil cooling facility and a loose coil cooling method, which are steel wires wound non-concentrically.

After hot rolling, the loose coil is cooled by being blown with air or immersed in a cooling fluid. Conventionally, as cooling equipment used for cooling at this time, stealmore using air as a cooling medium (Patent Document 1), EDC using hot water as a cooling medium (Patent Document 2), and DLP using molten salt as a cooling medium (Patent Document 1) Patent Document 3) is known.

However, after the loose coil is cooled by the conventional cooling equipment, the steel wire has a non-uniform strength in the longitudinal direction, and this non-uniformity is a periodic change with a period of the half circumference of the loose coil. I understand.

Therefore, conventionally, it was considered to control the non-uniformity of the cooling rate of the loose coil by stirring the cooling medium in the cooling tank and controlling the flow rate of the cooling medium ejected to the loose coil in the cooling tank. . For example, in the DLP, stirring by air bubbling is performed in order to stir molten salt that is a cooling medium (Patent Document 4). In addition, a cooling method has been proposed in which a cooling medium is sprayed onto a loose coil.
Japanese Patent Laid-Open No. 10-1743 JP-A-6-10054 JP-A-57-92136 Japanese Utility Model Publication No.59-44764

However, in the stirring by the air bubbling, the flow velocity forcibly applied by the cooling medium is small, and it is difficult to make the heat transfer coefficient to the loose coil large and uniform.
In the cooling by spraying, when the cooling medium is sprayed on the loose coil, there is a large difference in heat transfer coefficient between the part where the cooling medium is ejected and the part where the steel wire is shaded and the cooling rate is uneven. Becomes bigger.

Furthermore, the following knowledge was obtained from the research of the present invention about the cause of the uneven cooling rate of the loose coil. Referring to FIG. 4, the loose coil 100 has a different density in the width direction D, and the steel wire rods are densely packed at the width direction ends 101, 101 of the loose coil 100. Therefore, when the loose coil 100 is cooled in a uniform cooling medium, the cooling rate of the loose coil 100 is uneven. That is, the cooling rate at the width direction ends 101, 101 of the loose coil 100 is slower than the cooling rate at the center of the loose coil 100.

The present invention has been made in view of the above points, and improves the cooling rate of the end portion in the width direction of the loose coil by the cooling medium in the cooling tank, and the cooling rate is not uniform in the width direction of the loose coil. The purpose is to increase the average strength of the steel wire rod and reduce the non-uniformity of the strength in the longitudinal direction.

  In order to achieve the above-mentioned object, the loose coil cooling equipment of the present invention comprises a steel wire rod coil wound in a non-concentric circle, continuously immersed in a cooling medium in the cooling tank, In the cooling facility for transporting the loose coil by the transport device and cooling the loose coil, an ejection nozzle for ejecting a cooling medium from above is provided in the cooling tank toward the widthwise end of the loose coil. It is characterized by that.

  In the present invention, the cooling rate of the end portion in the width direction of the loose coil can be increased by ejecting the cooling medium from the ejection nozzle to the end portion in the width direction of the loose coil where the steel wire is densely packed. it can. Thereby, since the intensity | strength in the width direction edge part of the said loose coil becomes high, the average intensity | strength of a steel wire will also become high.

  In the cooling facility, the cooling medium suction portion provided on the streamline of the cooling medium ejected from the ejection nozzle and below the loose coil in the cooling tank, and the cooling medium sucked from the suction portion A circulation system that circulates the gas to the ejection nozzle and a cooling device that cools a cooling medium associated with the circulation system may be further included.

  The cooling medium ejected from the ejection nozzle to the end portion in the width direction of the loose coil flows in one direction toward the suction portion, and the cooling rate of the end portion in the width direction of the loose coil can be further increased. The flow of the cooling medium that has passed through the end of the loose coil in the width direction is absorbed by the suction part, and the flow of the cooling medium circulating in the cooling tank becomes slow. This can be reduced compared to the direction end. The cooling medium sucked from the suction portion can control at least the flow rate or temperature of the cooling medium ejected from the ejection nozzle by using the circulation system and the cooling device associated therewith. Therefore, the nonuniformity of the cooling rate can be reduced with respect to the width direction of the loose coil.

  In addition to the ejection nozzle, an opening formed on the streamline of the cooling medium ejected from the ejection nozzle and at the bottom of the cooling tank, and a liquid receiving tank into which the cooling medium from the cooling tank flows A cooling system that circulates the cooling medium in the liquid receiving tank to the ejection nozzle, and a cooling device that cools the cooling medium associated with the circulation system or a heating device that heats the cooling medium. .

According to yet another aspect, in the present invention, in the method of continuously immersing a loose coil in a cooling medium in a cooling bath and cooling the loose coil, the end of the loose coil in the width direction is cooled. It is characterized by ejecting a medium. By this method, the cooling rate of the end portion in the width direction of the loose coil by the cooling medium in the cooling tank can be improved.

In this case, the cooling rate of the loose coil may be controlled by controlling at least the flow rate or temperature of the cooling medium.

Further, when the cooling facility has the liquid receiving tank into which the cooling medium flows from the cooling tank, the temperature of the cooling medium in the cooling tank is set higher than the temperature of the cooling medium in the liquid receiving tank. May be.

ADVANTAGE OF THE INVENTION According to this invention, the cooling rate of the width direction edge part of the loose coil by the cooling medium in a cooling tank can be improved, and the nonuniformity of a cooling rate can be reduced with respect to the width direction of a loose coil. Therefore, since the strength at the end in the width direction of the loose coil is increased, the average strength of the steel wire is also increased, and the non-uniformity of the strength in the longitudinal direction of the steel wire can be reduced.

  Hereinafter, a preferred embodiment of the present invention will be described with reference to FIG. FIG. 1 shows a cross section of a loose coil cooling facility 1 according to the present embodiment.

  The cooling facility 1 according to the present embodiment has a cooling tank 2 having an upper surface opened and continuing in the longitudinal direction. In the cooling tank 2, a molten salt 3 as a cooling medium is stored. In the cooling bath 2, a transport roller 5 as a transport device is disposed at right angles to the longitudinal direction of the cooling bath 2. A plurality of transport rollers 5 are arranged. All of these transport rollers 5 or arbitrary rollers are rotationally driven by an appropriate drive device (not shown) such as a motor. The loose coil 4 is placed on the transport roller 5. Therefore, the loose coil 4 is successively conveyed along the longitudinal direction of the cooling tank 2 by the rotation of the conveying roller 5.

  A plurality of jet nozzles 6 for the molten salt 3 are arranged above the widthwise end of the loose coil 4. In the present embodiment, the ejection nozzles 6 are provided at four locations. The ejection nozzle 6 is immersed in the molten salt 3. This is to prevent bubbles from entering the molten salt 3 ejected from the ejection nozzle 6.

Suction portions 7 and 7 for the molten salt 3 are arranged on the streamline of the molten salt 3 ejected from the ejection nozzle 6 and below the loose coil 4 in the cooling tank 2. The suction portions 7 and 7 are provided at both ends of the merge header 8a. The merge header 8 a is connected to one end of the suction pipe 8, and the other end of the suction pipe 8 is connected to the pump 9. A discharge pipe 10 is connected to the pump 9, and a branch header 10 a is connected to the discharge pipe 10 above the cooling tank 2. The branch header 10a is provided with four ejection nozzles 6. With such a configuration, the molten salt 3 sucked from the suction portions 7 and 7 is supplied again to the jet nozzle 6 through the suction pipe 8 and the discharge pipe 10, and from the jet nozzle 6 to the loose coil 4. Erupted. That is, the molten salt 3 circulates through this route.
Further, the discharge pipe 10 is provided with a cooling device 11 for cooling the molten salt 3 flowing in the discharge pipe 10. If the temperature of the molten salt 3 sucked from the suction portions 7 and 7 is 450 ° C., the cooling device 11 cools the molten salt 3 to 400 ° C., for example.

  The cooling facility 1 according to the present embodiment is configured as described above, and an example of its operation will be described next. After the hot rolling, the loose coil 4 is conveyed in the cooling tank 2 by the conveying roller 5 and is immersed in the molten salt 3 for cooling treatment. As a result, the loose coil that has been hot-rolled to about 800 ° C. is cooled to about 450 ° C.

  During the cooling of the loose coil 4, the molten salt 3 is ejected from the ejection nozzle 6 toward the width direction end portion 101 where the steel wires of the loose coil 4 are dense. Most of the ejected molten salt 3 is sucked into a suction portion 7 disposed on the streamline and below the loose coil 4. Since the molten salt 3 flows between the ejection nozzle 6 and the suction portion 7 without disturbing the streamline thereof, the widthwise end portion 101 of the loose coil existing on the streamline of the molten salt 3 is effectively cooled. Can do.

The molten salt 3 sucked from the suction portion 7 passes through the merge header 8 a and the suction pipe 8, passes through the discharge pipe 10 and the branch header 10 a by the pump 9, and is again jetted from the jet nozzle 6, but from the loose coil 4. Due to the heat transfer, the molten salt 3 sucked from the suction portion 7 is heated. Therefore, the molten salt 3 is cooled by the cooling device 11 before being sent to the ejection nozzle 6. With this cooling device 11, the molten salt 3 is cooled from 450 ° C. to 400 ° C., for example.
The molten salt 3 cooled by the cooling device 11 is sent to the ejection nozzle 6.

As described above, according to the cooling equipment 1 of this embodiment, the molten salt 3 that is always cooled to the set temperature can be ejected from the ejection nozzle 6 to the end 101 in the width direction of the loose coil 4. Therefore, the cooling rate of the width direction end portion 101 of the loose coil 4 by the molten salt 3 in the cooling tank 1 can be improved, and the nonuniformity of the cooling rate in the width direction of the loose coil 4 can be reduced. . Therefore, the nonuniformity of the strength in the longitudinal direction of the steel wire can be reduced.
Since the flow rate of the molten salt 3 ejected from the ejection nozzle 6 is controlled by this pump 9, the amount of the molten salt 3 ejected from the ejection nozzle 6 can be controlled by controlling this pump 9. It is possible to control the uniformity of the finer cooling rate by further adjusting the cooling rate.

  Next, a cooling facility according to another embodiment will be described with reference to FIG. FIG. 2 shows a cross section of a loose coil cooling facility 20 according to another embodiment.

The configuration of the cooling facility 20 is different from the configuration of the cooling facility 1 in FIG.
First, the cooling facility 20 employs a cooling tank 2 that is smaller than the cooling tank 2, and a liquid receiving tank 22 that is larger than the cooling tank 2 is disposed below the cooling tank 2. Openings 21 and 21 are formed on the flow line of the ejection nozzle 6 at the bottom of the cooling tank 2. The liquid level of the molten salt 3 in the liquid receiving tank 22 is below the openings 21 and 21. The pump 9 is provided inside the liquid receiving tank 22.

The cooling facility 20 according to another embodiment is configured as described above. According to the cooling facility 20, most of the molten salt 3 ejected from the ejection nozzle 6 is sucked into the opening 21 formed on the streamline and at the bottom of the cooling tank 2. The molten salt 3 sucked into the opening 21 falls and flows into a liquid receiving tank 22 provided below the opening 21. Further, when there is an overflow 23 in the molten salt 3 in the cooling tank 2, this overflow 23 also flows into the liquid receiving tank 22. The molten salt 3 in the liquid receiving tank 22 flows through the discharge pipe 10 by the pump 9 and is sent to the ejection nozzle 6.
Thus, according to the cooling facility 20, the flow of the molten salt 3 from the ejection nozzle 6 to the opening 21 is formed without providing the suction portion 7 employed in the cooling facility 1 according to the above-described embodiment. be able to.

Furthermore, a heating device may be installed in place of the cooling device 12 provided in the discharge pipe 10. Thereby, the temperature of the molten salt 3 in the cooling tank 2 can be made higher than the temperature of the molten salt 3 in the liquid receiving tank 22. For example, when the temperature of the molten salt 3 in the liquid receiving tank 22 is 550 ° C., the molten salt 3 in the cooling tank 2 is heated from the liquid receiving tank 22 to the cooling tank 2 by heating with a heating device. The temperature of 3 can be set to 600 ° C., which is higher than the temperature of the molten salt 3 in the liquid receiving tank 22.
Further, the temperature of the molten salt 3 in the cooling bath 2 tends to increase due to the heat transferred from the loose coil 4 to the molten salt 3 in the cooling bath 2. Thus, when operating continuously, the temperature of the molten salt 3 in the cooling tank 2 is controlled by controlling the amount of the molten salt 3 circulating to the cooling tank 2 without operating the heating device. The temperature can be controlled to be higher than the temperature of the molten salt 3 in 22.
Thus, the loose coil is at the upper limit of the usable temperature of the molten salt 3 and higher than the usable temperature of the cooling device 12 that cools the molten salt 3 circulating from the liquid receiving tank 22 to the cooling tank 2. 4 can be performed, and the usable temperature range of the cooling facility 20 can be expanded.

  Further, a cooling facility according to another embodiment will be described with reference to FIG. FIG. 3 shows a cross section of a loose coil cooling facility 40 according to another embodiment.

The cooling facility 40 further includes an ejection nozzle 41 above the central portion of the loose coil 4 in the cooling facility 20 in FIG. By this jet nozzle 41, the molten salt 3 can be jetted also to the center part of the loose coil 4, and the whole loose coil 4 can be cooled more rapidly.
Even in such a case, it is preferable to adjust the flow rate of the molten salt 3 ejected from the ejection nozzles 6 and 41 in order to preferentially cool the widthwise end portion 101 of the loose coil 4. When a plurality of ejection nozzles 6 are arranged, the diameters of the nozzles may be different. As a result, a finer cooling rate can be controlled. Further, by arranging a plurality of ejection nozzles 6 in the width direction, it is possible to appropriately correct this according to the non-uniformity of the loose coil 4.
In this way, the nozzle 6 is arranged at the end portion 101 in the width direction of the loose coil 4 and the nozzle 41 is arranged at the center portion, so that the flow rate of the molten salt 3 as a whole in the width direction of the loose coil 4 is increased and the width is increased. By further increasing the flow rate of the molten salt 3 ejected to the directional end portion 101, the loose coil 4 can be cooled more quickly and with less unevenness.
Furthermore, by optimizing the position or opening area of the opening 21 or making them variable, the loose coil 4 can be cooled more quickly and with less unevenness.

The present invention is useful for cooling a loose coil of a steel wire wound in a non-concentric shape after hot rolling.

It is a longitudinal cross-sectional view of the cooling equipment of the loose coil concerning this Embodiment. It is a longitudinal cross-sectional view of the cooling equipment of the loose coil concerning other embodiment. It is a longitudinal cross-sectional view of the cooling equipment of the loose coil concerning other embodiment. It is a top view of a loose coil.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Loose coil cooling equipment 2 Cooling tank 3 Molten salt 4 Loose coil 5 Transport roller 6 Jet nozzle 7 Suction part 8 Suction pipe 8a Merge header 9 Pump 10 Discharge pipe 10a Branch header 11 Cooling device 12 Cooling equipment or heating device 20 Loose Coil cooling equipment 21 Opening portion 22 Receiving tank 23 Overflow 100 Loose coil 101 Loose coil width direction end

Claims (10)

After the hot rolling, the loose coil of the steel wire wound in a non-concentric circle is continuously immersed in the cooling medium in the cooling tank, and the loose coil is transferred by the transfer device in the cooling tank, and the loose coil In the cooling facility for cooling the coil,
A loose coil cooling facility, wherein a jet nozzle for jetting a cooling medium from above is provided in the cooling tank toward an end of the loose coil in the width direction. A cooling medium suction portion provided on a streamline of the cooling medium ejected from the ejection nozzle and below the loose coil in the cooling tank;
A circulation system for circulating the cooling medium sucked from the suction section to the ejection nozzle;
The loose coil cooling system according to claim 1, further comprising: An opening formed on the streamline of the cooling medium ejected from the ejection nozzle and formed at the bottom of the cooling tank;
A liquid receiving tank into which a cooling medium from the cooling tank flows;
A circulation system for circulating the cooling medium in the liquid receiving tank to the ejection nozzle;
The loose coil cooling system according to claim 1, further comprising: The loose coil cooling system according to claim 2 or 3, wherein the circulation system further includes a cooling device for cooling the cooling medium. The loose coil cooling system according to claim 3, wherein the circulation system further includes a heating device for heating the cooling medium. In the method of cooling a loose coil by continuously immersing a loose coil of a steel wire wound in a non-concentric circle after hot rolling into a cooling medium in a cooling bath,
A cooling method for a loose coil, characterized in that a cooling medium is ejected to the widthwise end of the loose coil in the cooling tank. The method for cooling a loose coil according to claim 6, wherein a cooling rate of the loose coil is controlled by controlling at least a flow rate or a temperature of the cooling medium. 6. The cooling equipment according to claim 5, wherein after the hot rolling, the loose coil of the steel wire wound up in a non-concentric circle is continuously immersed in a cooling medium in a cooling bath, and the loose coil is cooled. And cooling the temperature of the cooling medium in the cooling tank to be higher than the temperature of the cooling medium in the liquid receiving tank into which the cooling medium from the cooling tank flows. . The cooling medium is ejected from an ejection nozzle;
Installing the cooling medium suction portion on the streamline of the cooling medium ejected from the ejection nozzle and below the loose coil in the cooling tank;
The method for cooling a loose coil according to claim 6, wherein the cooling medium is sucked out from the suction portion and circulated to the ejection nozzle. The cooling medium is ejected from an ejection nozzle;
Forming an opening at the bottom of the cooling tank on the streamline of the cooling medium ejected from the ejection nozzle and below the loose coil in the cooling tank;
The method for cooling a loose coil according to claim 6, wherein the cooling medium is caused to flow out from the opening and circulate to the ejection nozzle.

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