JPH0280111A - Control device for loop value - Google Patents

Abstract

PURPOSE:To properly control the loop value by deciding the polarity of the deviation of the detected loop value from the set loop value and making the gain value be large to improve responsiveness when the polarity is negative, and, by making the gain value be small to improve stability when the polarity is positive. CONSTITUTION:When the loop 4 height of a steel material is higher than the set value, the deviation between the detecter signal through a loop value detector 6 and the set value on the loop value setter 5 becomes negative value. Through a polarity decider 13, a switching switch 15a of a gain setter 14 is turned off and a switching switch 15b is turned on, the deviation signal is multiplied by the gain K2 of a controller 8b to make the responsibility to be excellent. When the height of the loop 4 is low, the deviation value becomes positive, the gain K1 of the controller 8 is multiplied to the deviation signal to make the stability to be excellent. As the result, in both caces of displacing any side, proper control is performed to operate to quickly reach on the set value. By this method, shape unevenness of the product is reduced and the yield is improved.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a loop amount control device in a rolling facility.

(Prior Art) For example, in rolling equipment for steel materials, if the tension acting on the rolled material fluctuates, the shape of the product will be uneven. For this reason, conventionally a loop is formed in the rolling line and the loop suspension (the height of the loop) is adjusted to control the tension acting on the rolled material to be constant.

FIG. 2 shows a loop forming section in a rolling facility and its control device, and a loop 4 is formed in an upward direction between a rolling roll 2 and a rolling roll 3 from which the m-material 1 is sent out.

Then, when the operator sets the loop length using the loop amount setting device 5, the deviation between the set value and the detected value of the loop fake detected by the loop size detector 6 is determined, and this deviation and difference signal includes the loop size. A gain K is multiplied by the regulator 8 of the control equipment 7.

Thereafter, the deviation signal multiplied by the gain K is amplified by the loop control amplifier 9 and supplied to the drive device 10.

As a result, the motor 11 that drives the rolling roll 2 is controlled, and as a result, the loop distance is controlled to the set value.

In such loop amount control, if the loop suspension is displaced in a direction larger than the set value, that is, if the polarity of the deviation becomes negative, the stability in the control when bringing it closer to the setting 1 + n If the deviation between the loops becomes higher, and if the deviation between the loops is smaller than the set value, then if the polarity of the deviation becomes positive, it will be moved closer to the set value [
Distortion may occur in the loop shape when the loop is rotated, resulting in extremely low stability in control.

However, in the conventional loop mfli' control device, the gain K of the regulator 8 is set to 1Δ, so it has the disadvantage that it is not possible to simultaneously satisfy good control characteristics when displacement occurs in both directions. was occurring.

(Problem that J? Ming tries to solve) In this way, in the conventional loop control device, the stability of the control differs depending on the direction in which the loop is displaced, and the gain of the regulator 8 is Therefore, if the gain is set based on the case where the loop is displaced in a direction smaller than the set value (direction with low stability), the gain is set based on the case where the loop is displaced in a direction larger than the set value (direction with high stability). ), the coordination will be degraded. Then, the time required to reach the set value becomes longer due to the decrease in continuity, resulting in an increase in shape irregularities occurring in the product (rolled material), resulting in a decrease in yield.

The present invention was made to solve such conventional problems, and its purpose is to provide a loop amount control device that can change the gain depending on the direction in which the loop ω is displaced. It is in.

[Structure of the Invention] (Means for Solving the Problem) In order to achieve the above object, the present invention provides looping control that adjusts the deviation between the set loop and the detected loop fft to zero. The apparatus is characterized in that it includes a polarity determining means for determining the polarity of the deviation between the two loop days, and a gain setting means for changing the set gain according to the determination result of the polarity determining means.

(Function) In the loop amount control device according to the present invention, the polarity of the deviation between the set looping and the actually detected looping is determined by the polarity determining means.

If the polarity of this deviation is negative, the gain value is increased to improve coordination, and if it is positive, the gain value is decreased to improve stability. ing.

Therefore, appropriate control can be performed no matter which direction the loop is displaced with respect to the set value.

(Example) FIG. 1 is a block diagram showing an embodiment of the present invention.

As shown in the figure, a loop 4 is formed above a rolling roll 2 and a rolling roll 3 in a steel material 1 to be rolled.

In order to control this loop amount (the height of the loop 4), a loop length setting device 5 that sets the loop interval, a loop detector 6 that detects the actual loop interval, and a loop setting value. A loop amount control device 7 that generates an operation signal based on the deviation from the detected value, and a drive device 10 that controls the drive motor 11 of the rolling roll 2 based on the operation signal are provided.

The loop control device 7 includes a polarity determiner 13 that determines the polarity of the deviation between the set value and the detected value of the loop amount, and a gain setter 14 that changes the set gain according to the determination result of the polarity determiner 13. It consists of a loop control amplifier 9 that amplifies the output signal of the gain setter 14 and outputs an operation signal.

The gain setter 14 includes a changeover switch 15a that is turned on when the polarity determiner 13 determines that the deviation is positive.
and a changeover switch 15b that is turned on when it is determined that the negative value is negative, and respective changeover switches 15a and 1.
It has regulators 8a, 8b connected to the controller 5b.

The regulator 88G is set to a gain value of tK+, and the regulator 8b is set to a gain value of 2. Both gains laK+ and 2 have a relationship of 1<K2.

Next, the operation will be explained.

Now, when the height of the loop 4 formed in the steel material 1 is displaced to a position higher than the set value, the feedback signal of the loop amount detected by the loop T detector 6 and the loop amount setting device 5 The deviation from the set value will be a negative value. Therefore, the polarity determiner 13 determines that the changeover switch 15a of the gain setter 14 is OFF, and the changeover switch 15a of the gain setter 14 is OFF.
5b is turned on, the gain of the adjuster 8b is multiplied by 2 to the obtained deviation signal.

Since the gain of the W adjuster 8b is set to a large value, the coordination in control is improved.

Further, when the height of the loop 4 formed in the steel material 1 is displaced to a position lower than the set value, the deviation between the set value and the detected value of the loop amount becomes a positive value.

Therefore, the changeover switch 15a is turned on and the FJJ changeover switch 15b is turned off, so that the gain of the regulator 8a is multiplied by 1 in the deviation signal.

Since the gain of the regulator 8a is set to a small value, stability in control is improved.

In this way, in this embodiment, when the height of the loop 4 formed in the steel material 1 is displaced in a direction higher than the set value, the regulator 8b set to a large gain value of 2 is selected. , when the height of the loop 4 is displaced in a direction lower than the set value, the controller 8a is switched to select the smaller gain value set to 1.

Therefore, appropriate control is performed no matter which direction the displacement occurs, and as a result, the operation is performed so as to quickly reach the set value, thereby reducing shape irregularities occurring in the product (rolled material) and improving yield.

In this embodiment, a device (up looper) for forming the loop 4 on the upper side of the steel material 1 has been described, but the present invention is not limited to this.
It is also applicable to devices formed on the side (side looper).

[Effects of the Invention] As described above, in the present invention, the deviation between the set value and the detected value of the loop amount is determined, and the set gain is changed according to the polarity of this deviation. Therefore, appropriate control can be performed no matter which direction the loop is displaced with respect to the set value, and the effects of reducing shape irregularities occurring in products and improving yield can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram showing a conventional example. 1... Steel material 2.3... Rolling roll 4... Loop 5... Loop amount setting device 6... Loop amount detector 7
...Loop 8 control device 8.8a, 8b...Adjuster 9...Loop control amplifier 10...Drive device 1
3... Polarity determiner 14... Gain setting device 15a,
15b... Selector switch

Claims (1)

[Scope of Claims] A loop amount control device that adjusts the deviation between a set loop amount and a detected loop amount to zero, comprising: polarity determining means for determining the polarity of the deviation between the two loop amounts; A loop amount control device comprising: gain setting means for changing a set gain according to a determination result in the polarity determining means;