JPH0672413A - Band binding method of high-temperature coil binder - Google Patents

Abstract

PURPOSE:To provide a band binding method by automatic binder, in which no slackness is generated in the outer periphery of a wound high-temperature coil in the manufacturing process of hot-roled sheet steel. CONSTITUTION:At the time of tightening and binding the outer periphery of a high-temperature coil being a material to be bound with a band by an automatic binder equipped with a band-guiding means, a band-feeding, -supplying and-tightening means, and a band overlapping parts-bonding means, the coil is held for a predetermined period of time in the state of being tightened with the band and the temperature of the band is raised, and thereafter the overlapping parts of the band are bonded together. Thus, it is possible to prevent the generation of a harmful damage due to a slackness in the outer periphery of the high-temperature coil and to contrive to improve a yield to a large extent.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a band binding method for high temperature coils by an automatic binding machine.

[0002]

2. Description of the Related Art In a hot rolled steel sheet manufacturing process, an automatic binding machine is provided for the purpose of preventing loosening of the outer peripheral portion of a coiled high temperature coil. As a conventional automatic binding machine, the one described in JP-A-3-240620 is generally used.

As shown in FIG. 2, this automatic binding machine comprises an upper band guiding device 1, a lower band guiding device 2, a band feeding and tightening device 3, a band overlapping portion joining device 4, and a band holder 5. When the band is pulled out of the band holder 5 by the band feeding / tightening device 3 and swung around the upper and lower band guiding devices 1 and 2 surrounding the coil 6, and then the band is pulled back by the band feeding / tightening device 3, the band is guided by the upper and lower band guiding devices. It will be tightened with a band around the outer periphery of the coil 6 deviating from 1, 2, and then joined by the band superposition unit joining device 4,
As shown in FIG. 3, the outer periphery of the coil 6 is bound by the band 7.

[0004]

The problem with the above-mentioned conventional automatic binding machine is that when the high temperature coil wound in the hot rolled steel sheet manufacturing process is bound with a band, the elongation due to the band tightening tension causes the band to become hot. It is canceled by expansion due to expansion, the tightening force by the band is lost, and slack is generated in the coil outer peripheral portion during coil transportation, which causes harmful scratches on the steel plate surface.

The temperature of the coil wound in the hot rolling step is usually about 400 to 800 ° C., and the elongation due to thermal expansion when the temperature of the band rises from room temperature to high temperature is 0.5 to
It reaches about 0.9%. On the other hand, the band tightening force by a normal automatic binding machine is about 1000 to 1600 kg, and the band elongation due to the tightening tension is 0.1 to 0.3%.
It is only a degree. However, in the conventional band bundling method, the band is brought into close contact with the coil and the band overlap portion is joined in about 3 to 4 seconds, so that the thermal expansion of the band is large and the outer periphery of the coil is loosened. That is, it is as shown in FIG.

The present invention solves this problem.

[0007]

SUMMARY OF THE INVENTION The gist of the present invention is to use an automatic binding machine equipped with a band guiding device, a band feeding and tightening device, and a band overlapping portion joining device to tighten the outer periphery of a high temperature coil, which is the object to be bound, with a band. In the binding method, a band binding method for a high-temperature coil binding machine is characterized in that the coil is held in a band-tightened state for a predetermined period of time to raise the temperature of the band, and then the band overlapping portion is joined.

[0008]

According to the present invention, when the band is tightly wound around the outer periphery of the high temperature coil which is the object to be bound, the band contacts the coil in order to reduce the temperature difference due to the room temperature and the coil being high temperature. The predetermined time is secured, and the band overlap portion is joined after waiting for the temperature difference to decrease due to the temperature rise of the band.

In the α region of FIG. 4, even if the temperature of the band rises to the same temperature as that of the coil, the elongation due to the tightening tension remains. In the β region, when the temperature of the band rises to the same temperature as the coil, not only the elongation due to the tightening tension is released, but also the thermal expansion of the band is large, the band does not adhere to the coil, and slack occurs on the outer circumference of the coil. . Therefore, in order to prevent the slack from occurring in the outer circumference of the coil during transportation even when the band binds the high temperature coil, the band superposition part is joined after raising the band temperature so that the following equation 1 is satisfied. There is a need.

[0010]

[Formula 1] L _B −L _T ≧ 0, where L _B : elongation of the band due to tightening tension L _T : elongation due to temperature rise of the band after joining the band overlapped parts

That is, in order for the band elongation due to the tightening tension to remain even if the temperature of the band rises to the same temperature as the coil, the band is kept in tight contact with the coil and held for a predetermined time or more, It is necessary to join the band-polymerized portion after the temperature of the band rises above a predetermined temperature. Actually, there is a tensioning effect due to spring back (bending return restoring force) due to the outermost peripheral end of the coil,
Although the adhesion retention time of the band is not constant, the calculated adhesion and elongation of the band due to the thermal expansion of the band and the trial results of the actual coil show that the adhesion time between the band and the coil is at least 5-10 seconds. is there. As a result, it is possible to prevent the occurrence of slack in the outer peripheral portion of the coil even after the high temperature coil is transported and the coil is cooled to room temperature.

[0012]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a flow chart of the operation of binding the coil 6 with the band 7. First, the band feeding / tightening device 3 feeds the band 7 from the band holder 5 to the upper band guiding device 1 and the lower band guiding device 2. Next, the band 7 is pulled back by the band feeding / tightening device 3 to draw the band 7 from the band guiding devices 1 and 2 to the outer circumference of the coil 6. Then, the band feeding and tightening device 3 tightens the coil 6 with the band 7. Here, in order to bring the temperature of the band 7 close to the temperature of the coil 6 and reduce the temperature difference between the two, the band 7 and the coil 6 are held in tight contact for a predetermined time while the band 7 is tightened.
After a lapse of a predetermined time, the band 7 is joined by the band superimposing unit joining device 4, and the binding of the outer circumference of the coil 6 is completed.

Further, the same effect can be obtained by using means for reducing the amount of thermal expansion of the band, such as preheating the band or using a band having a small thermal expansion coefficient.

[0015]

EFFECTS OF THE INVENTION According to the present invention, it is possible to prevent the generation of harmful scratches due to slack in the outer peripheral portion of the high temperature coil wound in the hot rolled steel sheet manufacturing process, and to greatly improve the yield.

[Brief description of drawings]

FIG. 1 is a diagram showing an operation flow of an embodiment of the present invention.

FIG. 2 is a diagram showing a conventional automatic binding machine.

FIG. 3 is a diagram showing a state in which the outer peripheral portion of the coil is bound with a band.

FIG. 4 is a diagram showing a relationship between a temperature difference (ΔT ° C.) between a band and a coil and a band elongation (%) at the time of joining a band overlapping portion.

[Explanation of symbols]

 1 Upper band guide device 2 Lower band guide device 3 Band feeding and tightening device 4 Band overlapping section joining device 5 Band holder 6 Coil 7 band

Claims (1)

[Claims] 1. A band guiding device, a band feeding and tightening device,
In the method of tightening and binding the outer circumference of the high temperature coil, which is the object to be bound, with an automatic binding machine equipped with a band overlapping portion joining device, the temperature of the band was raised by holding the coil for a predetermined time in the tightened state with the band A band tying method for a high temperature coil tying machine, characterized in that the band superposition portion is subsequently joined.