JPH06182438A - Method for controlling transportation speed of steel strip - Google Patents

Abstract

PURPOSE:To provide a method for controlling transportation speed by which congestion of strip is prevented beforehand. CONSTITUTION:When the strip 1 that is transported on a transporting roller 2 is coiled by a winder 8 through a first pinch roll 4, a flying cutter 5, a conveyor type transportation device 6 for steel sheets and a second pinch roll 7 which are successively arranged, all these speeds under a normal state are controlled uniformly through a speed controller 10. Simultaneously, at the point of time when the strip 1 is cut off by the flying cutter 5, by controlling the speed of the subsequent transportation device 6 for steel sheets, the second pinch roll 7 and the winder 8 successively in a higher range against the circumferential speed of the flying cutter 5, the smooth winding is made possible without producing the congestion of the strip 1 at the transportation device 6 for steel sheets.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling the conveying speed of steel strip.

[0002]

2. Description of the Related Art Usually, when a steel strip such as a cold rolled steel sheet is processed in a refining line, as shown in FIG. 3, it is conveyed by a conveying roller 2 and tension is applied by a bridle roll 3, and
In general, it is wound up by the winder 8 through the pinch roll 4, the cutting machine 5, the conveyor type steel plate conveying device 6, and the second pinch roll 7.

By the way, at that time, the steel strip 1 is cut by the running machine 5.
Although the steel strip 1 is cut into a predetermined length by the method, the cut steel strip 1 needs to be wound up promptly, and therefore the following control is performed. The steel strip 1 to be wound up by the winder 8 is tension-controlled before cutting, but it should be wound after being switched to speed control after cutting. The steel plate conveying device 6 provided between the running cutting machine 5 and the winder 8 is subjected to speed control with a drooping characteristic (hereinafter referred to as droop), and has the same speed as the speed of the steel strip 1. Being controlled.

[0004]

However, in the conventional control method as described above, it is difficult to synchronize the speeds of the steel plate conveying device 6 and the winder 8 after the steel strip 1 is cut. Therefore, there are problems that the surface of the steel strip 1 is scratched and that the steel strip 1 is congested on the steel plate conveying device 6.

It is an object of the present invention to provide a method for controlling the conveying speed of a steel strip which solves the problems of the prior art as described above.

[0006]

According to the present invention, steel strips conveyed on a conveyance line are continuously arranged with a first pinch roll, a cutting machine, a conveyor type steel plate conveying device, and a second steel sheet conveying device.
A method of controlling the conveying speed when winding the steel strip on the winding machine via the pinch roll, in which both speeds are controlled to be the same in the steady state, and when the steel strip is cut by the running cutter, A method for controlling the speed of transporting a steel strip is characterized in that the speeds of a steel plate transporting device, a second pinch roll, and a winder following the peripheral speed of the running cutter are sequentially increased.

[0007]

[Operation] According to the present invention, a steel plate conveying device, a second steel plate conveying device for increasing the speed after cutting the steel strip with respect to the peripheral speed of the hot-dip cutting machine.
Since the speed of the pinch roll and winder of the above has been increased sequentially, it becomes possible to smoothly convey and wind up,
Tension is generated between the winder and the second pinch roll, and backward tension can be obtained even between the second pinch roll and the steel plate conveying device, so that the congestion of the steel strip on the steel plate conveying device is suppressed in advance. It is possible to

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a conceptual diagram showing an embodiment of the present invention. In the figure, the same members as those in the conventional example are designated by the same reference numerals and the description thereof will be omitted. In FIG. 1, 10 is a speed control device, 11 to 14 are automatic speed control devices (ASR), 15 is a droop, 16 to 19 are cutting machines 5, a steel plate conveying device 6, and a second device.
Is a drive motor for individually driving each of the pinch roll 7 and the winder 8.

As shown in FIG. 2, the speed controller 10 has a first speed setter 21 for setting the line speed before cutting.
And the second speed setter 22 that sets the line speed after cutting
And a changeover switch 23 for switching each control signal in response to a disconnection start signal, a first speed multiplier 24, and a second speed multiplier 25. Now, the steady line speed set value V _REF1 is _stored in the first speed setter 21
The line speed setting value V after cutting
_REF2 (however, V _REF2 > V _REF1 ) is set, and the first speed multiplier 24 has a calculation coefficient (1 + α).
And a calculation coefficient of (1 + β) is set in the second speed calculator 25. Note that α and β are very small values of 0.1 or less.

First, in the steady state, the setting signal of V _REF1 output from the first speed setting unit 21 is a changeover switch.
It is given to each ASR 11 to 14 via the contact point a of 23, and is driven by each drive motor 16 to 19 to the cutting machine 5, the steel plate conveying device 6,
The second pinch roll 7 and the winder 8 are controlled at the same speed. Therefore, when the steel strip 1 is cut by the cross cutting machine 5, the changeover switch 23 is activated and switched by the cutting start signal, and the second speed setting device 22 outputs to the ASR 12 of the steel plate conveying device 6. Setting signal V _REF2 is applied. Hereinafter, V _REF2 is applied to ASR13 of the second pinch roll 7.
The setting signal of × (1 + α) is V in the ASR14 of the winder 8.
A setting signal of _REF2 × (1 + α) × (1 + β) is given, and the speed control is performed based on the setting signal. In addition,
At this time, the peripheral speed of the cross-cutting machine 5 serves as a reference, so the setting signal given to the ASR 11 is the same V as in the steady state.
_It remains _REF1 .

In this way, the tip of the steel strip 1 can be quickly reached to the winder 8 by sequentially increasing the speeds of the steel plate transport device 6, the second pinch roll 7 and the winder 8. At the same time, a tension is generated between the winder 8 and the second pinch roll 7, and a rearward tension can be obtained between the second pinch roll 7 and the steel plate transport device 6 as well. No belt congestion will occur.

When the steel strip 1 is started to be wound by the winder 8, the changeover switch 23 returns to its original state and V _REF1 output from the first speed setting device 21 via the contact point a. The setting signal of (1) is given to each ASR 12 to 14 in the same manner as the ASR 11, and is wound in a steady state.

[0013]

As described above, according to the present invention,
At the time of cutting the steel strip, the speed of the following steel strip conveyor, pinch roll and winder was sequentially increased based on the peripheral speed of the hot strip cutter to give backward tension to the steel strip. The steel strip can be smoothly wound around the winder without congestion and contributes to the improvement of product quality and yield.

[Brief description of drawings]

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

FIG. 2 is a block diagram of a speed control device used in the present invention.

FIG. 3 is a schematic diagram of a conventional transfer line.

[Explanation of symbols]

 1 Steel strip 2 Conveyor roller 4 First pinch roll 5 Cross-cutting machine 6 Steel plate conveying device 7 Second pinch roll 8 Winder 10 Speed controller 11-14 Automatic speed controller (ASR) 15 Droop ) 16 to 19 Drive motor 21 First speed setter 22 Second speed setter 23 Changeover switch 24 First speed multiplier 25 Second speed multiplier

Claims (1)

[Claims] 1. A steel strip carried on a carrying line is wound via a continuously arranged first pinch roll, a cross cutting machine, a conveyor type steel plate carrying device, and a second pinch roll. A method for controlling a conveying speed when winding the steel strip on a machine, in which both speeds are controlled to be the same in a steady state, and when the steel strip is cut by the traveling machine, the peripheral speed of the traveling machine is cut. A method for controlling the speed of transporting a steel strip, characterized in that the speed of the subsequent steel plate transporting device, the second pinch roll, and the winder is controlled to be sequentially increased.