JPH05111276A - Control apparatus for rolling speed - Google Patents

Abstract

PURPOSE:To obtain a control apparatus for rolling speed capable of automatically removing slips and preventing the quality of the rolls and the production efficiency from being lowered among others when any slip occurs between the material and rolling rolls. CONSTITUTION:There are provided a torque current detector 4 for detecting the torque current of a motor M which drives rolling rolls R, and a slip detector 7 for detecting any slip occurring between a material W and rolling rolls R on the basis of the torque current. A speed setting device 1A reduces the speed setting value VR of the rolling rolls R until the slip is removed in accordance with the slip detecting signal SS from the slip detector 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling roll speed control device for controlling the speed of rolling rolls in a rolling device for iron or steel.

[0002]

2. Description of the Related Art FIG. 2 is a block diagram showing a conventional rolling roll speed control device. In the figure, reference numeral 1 denotes the speed of a rolling roll R for rolling a material W such as steel and a schedule D.
It is a speed setter that sets based on ATA and outputs a speed set value VR. Reference numeral 2 denotes a motor drive device that drives a motor M directly connected to the rolling roll R according to the speed set value VR.

Next, the operation of the conventional rolling roll speed control device shown in FIG. 2 will be described. First, the schedule DATA of the speed of the rolling roll R arbitrarily set by the operator is input to the speed setter 1. Speed setter 1
Sets the rolling roll speed such that the material W is smoothly rolled based on the schedule DATA, and inputs the speed set value VR to the drive device 2. The drive device 2 drives and controls a motor M directly connected to the rolling roll R so that the rolling roll R rotates according to the speed set value VR. As described above, the material W is rolled and discharged at a predetermined rolling roll speed.

[0004]

The conventional rolling roll speed control device is configured as described above and has no means for detecting slippage between the material and the rolling roll R when the slippage occurs. The rolling roll R continues to rotate at a predetermined speed. Therefore, in order to eliminate the slip, the speed setting value VR is switched from the automatic setting by the speed setter 1 to the manual setting and the rolling mill is operated manually, or the rolling roll R is once driven. There was a problem that it had to be stopped. Further, there is a problem that the quality of the rolled product is deteriorated and the production efficiency is deteriorated due to the slip during this period.

The present invention has been made to solve the above problems, and when slip occurs between the material and the rolling rolls, the slip can be automatically eliminated, and the quality of the rolled product deteriorates. An object of the present invention is to obtain a rolling roll speed control device that does not cause a reduction in production efficiency.

[0006]

A rolling roll speed control device according to the present invention includes a torque current detector for detecting a torque current of a motor for driving a rolling roll and a material and a rolling roll based on the torque current. A slip detector for detecting the occurrence of slip is provided, and the speed setter reduces the speed set value of the rolling roll according to the slip detection signal from the slip detector until the slip is eliminated.

[0007]

According to the present invention, when the slip between the material and the rolling roll is detected based on the torque current of the motor for driving the rolling roll, the slip is eliminated by reducing the speed of the rolling roll.

[0008]

EXAMPLES Example 1. 1 is a block diagram showing a first embodiment of the present invention, in which 2, M, R and W are the same as those described above. 1A is a speed setter that sets the speed of the rolling roll R and outputs a speed set value VR based on a schedule DATA and a slip detection signal (described later). Three
Is a load cell disposed above the rolling roll R, 4 is a torque current detector that detects the torque current of the motor M and outputs a torque current feedback value TF, and 5 is the speed feedback value VF that detects the speed of the motor M Is a speed detector for outputting the rolling load, and 6 is a rolling load detector for detecting the rolling load according to the output signal of the load cell 3 to output a rolling load feedback value LF. 7 is a torque current feedback value T.
It is a slip detector that detects a slip between a rolling roll R and a material W based on F, a speed feedback value VF, and a rolling load feedback value LF.

Reference numerals 71 to 73 are various detectors provided in the slip detector 7, 71 is a torque abnormality detector for detecting an abnormality in the payout torque of the rolling roll R based on the torque current feedback value TF, and 72 is A speed feedback normal detector that detects that the speed control is normally performed based on the speed feedback value VF and the speed set value VR, and 73 detects that the rolling load is normal based on the rolling load feedback value LF. This is a normal rolling load detector. Reference numeral 74 is an AND circuit that takes the logical product of the torque abnormality signal TS, the speed feedback normal signal VS and the rolling load normal signal LS from each of the detectors 71 to 73,
The slip detection signal SS is output when each of the signals TS, VS, and LS is at "H" level.

Next, the operation of the first embodiment of the present invention shown in FIG. 1 will be described. First, in a normal operation state, similarly to the above, the material W is rolled and discharged at a predetermined rolling roll speed in accordance with the speed set value VR based on the schedule DATA.

On the other hand, when a slip occurs between the material W and the rolling roll R, the rolling roll R applied to the motor M
Since the driving load of is reduced, the torque current feedback value TF detected by the torque current detector 4 is also reduced. The torque current feedback value TF is input to the torque abnormality detector 71 and compared with a preset slip detection value. When the slip occurs, it is determined that the torque current feedback value TF has become smaller than the slip detection value, and the torque abnormality detector 71 outputs the "H" level torque abnormality signal TS.

The speed feedback value VF detected by the speed detector 5 is input to the speed feedback normal detector 72 and compared with the speed set value VR of the rolling roll R. Even if slip occurs, the rolling roll R
As long as the speed control system is normal, the speed of the rolling roll R matches the speed set value VR, so the speed feedback normal detector 72 outputs the "H" level speed feedback normal signal VS.

Further, the rolling load feedback value LF detected by the rolling load detector 6 is input to the rolling load normality detector 73 and compared with a preset rolling detection value. Even when slip occurs, the rolling load shows a normal value and the rolling load feedback value LF also shows a normal value, so the rolling load normal detector 73 outputs the rolling load normal signal LS at the “H” level.

As described above, the slip occurs when the torque current is normal and the speed feedback and rolling load are abnormal. Only at this time, the "H" level abnormal torque signal TS, the speed feedback normal signal VS, and the rolling load normal signal LS are both output, and the AND circuit 74 that takes the logical product of these signals detects the "H" level slip. The signal SS is output. Speed setter 1A
When the slip detection signal SS is input, the drive device 2
The speed setting value VR input to the rolling roll R and the material W
Until there is no speed difference between them, i.e. until the slip is cleared.

When the slip is eliminated by the above operation, the drive load of the rolling roll R on the motor M increases again and the torque current feedback value TF also increases. Then, when the torque abnormality detector 71 determines that the torque current feedback value TF has become larger than the slip detection value, the torque abnormality signal TS indicates OF.
It is set to F. Since one input of the AND circuit 74 is turned off, its output signal, that is, the slip detection signal SS
Turn off. In response to this, the speed setter 1A gradually increases the speed set value VR to the value before the slip occurs, and returns to the same control as before the slip occurred.

[0016]

As described above, according to the present invention, the slip occurs between the material and the rolling roll based on the torque current detector for detecting the torque current of the motor for driving the rolling roll and the torque current. And a slip detector for detecting, the speed setter reduces the speed set value of the rolling roll according to the slip detection signal from the slip detector until the slip is eliminated, so that a slip occurs between the material and the rolling roll. In this case, there is an effect that a slip can be automatically eliminated, and a rolling roll speed control device that does not cause deterioration of the quality of rolled products, deterioration of production efficiency, and the like can be obtained.

[Brief description of drawings]

FIG. 1 is a block diagram showing a first embodiment of the present invention.

FIG. 2 is a configuration diagram showing a conventional rolling roll speed control device.

[Explanation of symbols]

 1A Speed setting device 4 Torque current detector 7 Slip detector R Rolling roll M Motor SS Slip detection signal VR Speed setting value W Material

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[Procedure amendment]

[Submission date] August 10, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction content]

As described above, the slip occurs because the torque current is abnormal and the speed feedback and rolling load are positive.
It's time to show forever. Only at this time, the "H" level abnormal torque signal TS, the speed feedback normal signal VS, and the rolling load normal signal LS are both output, and the AND circuit 74 that takes the logical product of these signals outputs "H" level slip detection. The signal SS is output. Speed setter 1A
When the slip detection signal SS is input, the drive device 2
The speed setting value VR to be input to the rolling roll R and the material W
Until there is no speed difference between them, i.e. until the slip is eliminated.

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 1

[Correction method] Change

[Correction content]

[Figure 1]

Claims (1)

[Claims] 1. A rolling roll speed control device comprising a speed setting device for setting the speed of a rolling roll for rolling a material, comprising a torque current detector for detecting a torque current of a motor for driving the rolling roll, A slip detector for detecting that a slip has occurred between the material and the rolling roll based on the torque current, and the speed setting device is provided.
According to a slip detection signal from the slip detector, the rolling roll speed control device is configured to reduce the speed set value of the rolling roll until the slip is eliminated.