JPH0543101A - Strip conveying device - Google Patents

Abstract

PURPOSE:To restrain a flying phenomenon or a flapping phenomenon of a strip, and convey the strip stably at a high speed by arranging a guide plate having flat lower surface in the same direction above a conveyor to load/carry the strip. CONSTITUTION:Since the tip rising height of a strip 5 is restricted by arranging a guide plate 6 having flat lower surface above a hot run table 2 in certain height, a flying phenomenon can be prevented from developing completely, and even if flying is once started, the strip 5 is again restored onto the hot run table 2 due to dead weight and flexural rigidity. Furthermore, impact force or frictional force in the case when the tip part of the strip 5 comes into collision with the guide plate 6 is decreased by a function of air, water and so on ejected from holes arranged in the guide plate 6. Further, the thin type strip 5 can be conveyed stably at high speed without turning it up to height higher than the guide plate 6 even in the case of a flapping phenomenon of the rear edge part of the strip 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus capable of conveying thin strips at high speed in hot rolling, and is applicable to cold rolling equipment.

[0002]

2. Description of the Related Art The main structure of a conventional hot rolling facility is shown in FIG. As shown in the figure, a hot run table 2 is disposed on the exit side of the final stand 1, and the direction of the strip 5 is changed by a pinch roll 3 on the front side of the hot run table 2 and wound by a coiler 4. ing.

Here, as shown in FIG. 13, the strip 5
When the tip of the strip 5 is on the hot run table 2 and does not reach the pinch roller 3, the tip of the strip 5 is rolled up, causing a so-called flying phenomenon. When this flying phenomenon occurs, running performance on the hot run table 2 is significantly deteriorated, and winding failure or winding failure on the coiler 4 occurs. This tendency becomes remarkable as the strip 5 becomes thinner and the strip passing speed increases.

For this reason, in general, a method is adopted in which the strip 5 is rolled at a relatively low threading speed until it reaches the coiler 4 and is wound, and is accelerated after the winding on the coiler 4 is completed. Has been. Further, as shown in FIG. 14, when the rear end portion of the strip 5 is off the final stand 1 and on the hot run table 2, the tension acting between the final stand 1 and the coiler 4 is halved. Therefore, a wave phenomenon occurs in the strip 5. Therefore, in order to compensate the tension backward (to the left in the drawing) by the frictional force between the hot run table 2 and the strip 5, the roll rotation speed of the hot run table 2 is reduced, or the winding speed is reduced. Measures were taken.

However, when the thickness of the strip 5 is reduced, the frictional force is reduced and the effect of tension compensation is reduced. As described above, in the conventional strip winding device, the thinner the strip is, the more difficult it is to wind at high speed.

[0006]

The occurrence of the above-mentioned flying phenomenon at the strip leading end and the corrugation phenomenon at the strip trailing end result from the fact that sufficient restraining force is not applied to the strip end. ing. For this reason, for example, as described in JP-A-56-56715, a method of mechanically gripping the strip end portion by a clamp device on the traveling vehicle has been considered, but the traveling vehicle can be operated at high speed in a short time. There were technical development issues such as means for accelerating and a mechanism for surely approaching and gripping the strip end, and it was not realized. Further, as described in Japanese Patent Application No. 02-257428, there is also considered a strip conveying device capable of stably passing a thin strip at a high speed by utilizing the electromagnetic force of a linear motor. However, in some cases, a more economical method is desired.

The present invention has been made in view of the above-mentioned prior art, and by using a guide plate on a relatively short hot run table, a strip transport apparatus which suppresses the complete development of the flying phenomenon and the ripple phenomenon. The purpose is to provide. Further, another object of the present invention is to provide a strip transporting device capable of stably passing a thin strip at high speed by using a DC electromagnet together.

[0008]

According to a first aspect of the present invention which achieves the above object, a guide plate having a flat lower surface is arranged in the same direction as a conveyor above a conveyor on which strips are placed and conveyed. It is characterized by having done. Further, the second configuration of the present invention to achieve the above-mentioned object is to arrange a guide plate having a flat lower surface in the same direction as the conveyor and above the guide plate, above the conveyer on which the strip is placed and conveyed. Hanging a plurality of DC electromagnets in the same direction as the conveyor,
Further, the plurality of DC electromagnets are connected to a power source having a switching device.

[0009]

[Operation] When the tip of the strip causes a flying phenomenon, air resistance (lift), its own weight, and bending rigidity
As shown in FIG. 13, a constant shape is maintained. Hereinafter, this state is called full development. At this time, the height of the strip leading end is largely controlled by the strip thickness and the transport speed. According to the present invention, the guide plate is installed on the hot run table at a certain height to limit the lifting height of the strip tip. And again on the hot run table for bending stiffness. Further, by the action of fluid such as air or water ejected from the holes provided in the guide plate, it is possible to reduce the impact force and the frictional force when the strip tip end collides with the guide plate. Further, even when the trailing end of the strip is wavy, the thin strip can be stably conveyed at a high speed without curling up beyond the height of the guide plate.

Further, when a plurality of DC electromagnets installed above the guide plate are energized, a suction force is applied to the strip at a position immediately below the electromagnets. Further, when power is supplied while switching to a plurality of DC electromagnets by the switching device, when the strip has a negative moving speed relative to the magnetic field (static magnetic field) of the DC electromagnets as shown in FIG. , A braking force is induced in the strip in the direction opposite to the moving speed. The braking force can be reduced by exciting the electromagnet synchronously with the transport speed of the strip. Therefore, when passing through the strip leading end, only the electromagnets directly above the leading end are excited to give attractive force, and when passing through the strip rear end, all electromagnets are excited to give attractive force and braking force. As a result, the leading end portion or the trailing end portion of the strip is stably conveyed while floating from the conveyor and being close to the electromagnet.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the drawings. FIG. 1 shows an embodiment of the present invention. The embodiment shown in the figure shows a strip transport device in a hot rolling facility. As shown in the figure, a hot run table 2 is arranged on the exit side of the final stand 1, and a pinch roll 3 and a coiler 4 are arranged in front of the hot run table 2. As the hot run table 2, for example, a conveyor in which a large number of rollers are arranged in a line as shown in the drawing can be used, and is driven by a motor (not shown). Therefore, the strip 5 leaving the final stand 1 is placed on such a hot run table 2 and transferred to the pinch roll 3, and then the direction is changed by the pinch roll 3 and the coiler 4 is moved.
It is designed to be wound around.

Further, in this embodiment, above the hot run table 2 and along the hot run table 2,
At a height of 100 to 200 mm, a flat lower guide plate 6 having a width of more than half the maximum width of the strip 5 is arranged. When the tip of the strip causes a flying phenomenon, air resistance (lift force), its own weight, and bending rigidity cause the phenomenon shown in FIG.
As shown in Fig. 3, the full development of the flying phenomenon in which a constant shape is maintained occurs. At this time, the height of the strip leading end is largely controlled by the strip thickness and the transport speed. For example, when a strip having a plate thickness of 0.8 mm is transported at 1000 m / min, the height of the strip tip when flying occurs is 400 to 500 mm. In this embodiment, the guide plate 6 is installed on the hot run table at a height of 100 to 200 mm to limit the lifting height of the strip tip. Therefore, it is possible to prevent the flying phenomenon from fully developing, and to prevent the flying phenomenon. Even if started, it is restored on the hot run table again due to its own weight and bending stiffness. Therefore, FIG.
As shown in (a), even if the tip of the strip begins to fly while running on the hot run table 2,
The guide plate 6 limits the height of the strip tip. Therefore, as shown in FIG. 4B, the lifting height of the strip 5 is increased by the air resistance (lift force), and the inclination angle is decreased. Then, as shown in FIG. 4C, the lift is reduced, and the strip 5 is restored to the hot run table 2 again due to its own weight and bending rigidity. In addition, as shown in FIG. 5, the hot run table 2 is located at the rear end of the strip.
Even if a wavy phenomenon occurs during traveling on the upper side, the height of the strip rear end portion of the guide plate 6 is limited.

As described above, as a result of suppressing the flying phenomenon and the waviness phenomenon, the strip 5 can be stably conveyed at high speed even when the strip 5 is thin. Also,
In the above embodiment, the guide plate 6 is installed at an appropriate height on the hot run table 2 (usually about 100 to 200 mm), so that the strip 2 can be stably transported at a high speed, but it is more stably transported. In order to do so, as shown in the second embodiment shown in FIG. 2, a jet flow of water may be used together.
That is, as shown in FIG. 2, the water chamber 7 is provided above the guide plate 6 arranged on the hot run table 2, and the guide plate 6 is provided.
A large number of ejection holes 9 are formed in the hole. The water chamber 7 is connected to a pump 8 so that water can be supplied.
Therefore, the water supplied to the water chamber 7 is ejected downward through the ejection holes 9 to mitigate the impact force when the strip 5 collides with the guide plate 6, and acts on the contact portion between the guide plate 6 and the strip 5. It has the effect of reducing the frictional force. Therefore, the strip 5 can be transported more stably.

Although water is used in the above embodiment, air may be used as in the third embodiment shown in FIG. That is, in this embodiment, the air chamber 10 is installed above the guide plate 6, and the guide plate 6 is provided with a large number of ejection holes 9. The air chamber 10 is connected to the compressor 11 and supplied with compressed air. Therefore, the compressed air supplied to the air chamber 10 is ejected downward through the ejection holes 9 and the strip 5
Reduces the impact force when it collides with the guide plate 6 and reduces the frictional force between the guide plate 6 and the strip 5, so that the transport of the strip 5 can be further stabilized. FIG. 6 shows a fourth embodiment of the present invention. The embodiment shown in the figure shows a strip transport device in a hot rolling facility. As shown in the figure, a hot run table 2 is arranged on the exit side of the final stand 1, and a pinch roll 3 and a coiler 4 are arranged in front of the hot run table 2. As the hot run table 2, for example, a conveyor in which a large number of rollers are arranged in a line as shown in the drawing can be used, and is driven by a motor (not shown). Therefore, the strip 5 leaving the final stand 1 is placed on such a hot run table 2 and transferred to the pinch roll 3, and then the direction is changed by the pinch roll 3 and wound on the coiler 4. Is becoming

Further, in this embodiment, a guide plate 6 is arranged above the hot run table 2 along the hot run table 2 and a plurality of direct current type DC plates are provided on the guide plate 6. Electromagnet 1
2 are arranged along the hot run table 2. Therefore, as shown in FIG. 10, while the strip tip is running on the hot run table 2, the DC electromagnet 12 is synchronized with the movement of the tip of the strip 5 by a power source (not shown) having a switching device. When excited, a suction force acts upward on the strip tip. Therefore, the tip of the strip is lifted from the hot run table 2, approaches the electromagnet 6, and a constant interval is maintained while the attraction force and the weight of the strip are balanced. Since the strip 5 travels in such a stable state, the strip tip portion does not curl up and the phenomenon in which the strip tip portion collides with the roll of the hot run table is avoided, and thus the flying phenomenon is suppressed. It will be.

Further, as shown in FIG. 11, when the strip rear end runs in a DC magnetic field which is entirely excited by a power source (not shown) and the strip 5 has a negative relative speed with respect to the moving magnetic field. At the rear end of the strip, an upward suction force and a horizontal braking force act simultaneously. Tension (back tension) is generated in the strip 5 by such a braking force, so that the ripple phenomenon is suppressed. As described above, as a result of suppressing the flying phenomenon and the waviness phenomenon, even when the strip 5 is thin, it can be stably conveyed at high speed. Even if the strip 5 is going to be wound up further, the guide plate 6
Is installed at a certain height on the hot run table, the guide plate 6 limits the lifting height of the tip of the strip 5, and it is possible to prevent the flying phenomenon from fully developing. It will be restored on the hot run table again due to its own weight and bending rigidity. Further, in the above-mentioned embodiment, the strip 5 can be stably transported at high speed by utilizing the electromagnetic force of the DC electromagnet 12, but in order to make the traveling more stable, the fifth embodiment shown in FIG. As shown in the example, the electromagnetic force of the DC electromagnet 12 and the jet of water may be used together.

That is, as shown in FIG. 7, a water chamber 7 is formed in the guide plate 6 arranged on the hot run table 2. A large number of ejection holes 9 are formed on the lower surface of the water chamber 7, that is, on the surface facing the strip 5. The water chamber 7 is connected to a pump 8 so that water can be supplied. Therefore, the water spouted downward through the spout holes 9 generates a large repulsive force with respect to the strip 5 as the strip approaches, and the interval is kept constant, so that the transport of the strip 5 is further stabilized. Become.

Although water is used as the fluid in the above embodiment, air may be used as in the sixth embodiment shown in FIG. That is, in this embodiment, the air chamber 10 is installed above the guide plate 6, and the guide plate 6 has a large number of ejection holes 9
Has been opened. The air chamber 10 is connected to the compressor 11 and supplied with compressed air. Therefore,
The compressed air supplied to the air chamber 10 is ejected downward through the ejection holes 9 to mitigate the impact force when the strip 5 collides with the guide plate 6 and reduce the frictional force between the guide plate 6 and the strip 5. Therefore, the transport of the strip 5 can be further stabilized.

[0019]

As described above in detail with reference to the embodiments, since the present invention can limit the lifting height of the strip by using the guide plate, the flying phenomenon and the waviness phenomenon of the strip can be prevented. The strip can be suppressed and the strip can be stably conveyed at high speed. The present invention can be applied not only to hot rolling equipment but also to cold rolling equipment. Furthermore,
According to the present invention, since the electromagnetic force of the electromagnet is applied to the strip as an attraction force or a braking force, the flying phenomenon and waviness phenomenon of the strip can be suppressed and the strip can be stably conveyed at high speed. The present invention can be applied not only to hot rolling equipment but also to cold rolling equipment.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a strip transport device in hot rolling according to a first embodiment of the present invention.

FIG. 2 is an arrow view of a portion corresponding to the line AA in FIG. 1 according to the second embodiment of the present invention.

FIG. 3 is an arrow view of a portion corresponding to the line AA in FIG. 1 according to the third embodiment of the present invention.

FIG. 4 is an explanatory diagram showing suppression of a flying phenomenon at the tip of the strip.

FIG. 5 is an explanatory diagram showing suppression of a waviness phenomenon at a rear end portion of the strip.

FIG. 6 is a configuration diagram of a strip transport device in hot rolling according to the first embodiment of the present invention.

FIG. 7 is an arrow view of a portion corresponding to the line AA in FIG. 6 according to the second embodiment of the present invention.

8 is an arrow view of a portion corresponding to the line AA in FIG. 6 according to the third embodiment of the present invention.

FIG. 9 is an explanatory view showing an electromagnetic force when a strip is transported in a static magnetic field.

FIG. 10 is an explanatory view showing suppression of a flying phenomenon at the rear end portion of the strip.

FIG. 11 is an explanatory diagram showing suppression of a waviness phenomenon at the rear end portion of the strip.

FIG. 12 is a configuration diagram of a conventional strip transport device.

FIG. 13 is an explanatory diagram showing a flying phenomenon of a strip.

FIG. 14 is an explanatory diagram showing a waviness phenomenon of a strip.

[Explanation of symbols]

 1 Final Stand 2 Hot Run Table 3 Pinch Roll 4 Coiler 5 Strip 6 Guide Plate 7 Water Chamber 8 Pump 9 Jet Hole 10 Air Chamber 11 Compressor 12 DC Electromagnet

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ritsuo Hashimoto 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima-shi, Hiroshima Mitsubishi Heavy Industries, Ltd. Hiroshima Works (72) Inventor Akira Kaya Shinmachi, Nishi-ku, Hiroshima-shi, Hiroshima 6-22 No. 22 Mitsubishi Heavy Industries Ltd. Hiroshima Works

Claims (2)

[Claims] 1. A strip transporting device, wherein a guide plate having a flat lower surface is arranged above a conveyor for placing and transporting strips in the same direction as the conveyor. 2. A guide plate having a flat lower surface is arranged above a conveyor for mounting and transporting strips in the same direction as the conveyor, and a plurality of DC electromagnets are provided above the guide plate. A strip conveying device in hot rolling, which is hung in the same direction, and further, the plurality of DC electromagnets are connected to a power source having a switching device.