JP2658738B2 - Wrapper roll failure monitoring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a failure monitoring device provided with an abnormality judging mechanism for a wrapper roll step avoidance control in a winding device for a steel plate or the like, and more particularly to a failure monitoring device capable of automatically monitoring an abnormal jump height of a wrapper roll. The present invention relates to a device for monitoring a failure of a wrapper roll.

[0002]

2. Description of the Related Art For example, a wrapper roll used in a steel sheet winding device is a device that guides the tip of a steel sheet around a mandrel together with a wrapper guide and presses the steel sheet against the mandrel. FIG. 1 shows a control system for one wrapper roll, and other wrapper rolls usually provided with three or more wrappers are omitted for easy understanding.

A steel plate 3 rolled by a rolling mill (not shown) is supplied to a mandrel 2 via an upper pinch roll 4 and a lower pinch roll 5 while being appropriately guided by a guide (not shown). After the tip reaches the mandrel 2, it is sequentially wound around the mandrel 2 along a wrapper guide (not shown).

The timing when the tip of the steel sheet 3 reaches the mandrel 2 and the timing when the tip of the steel sheet passes through the wrapper roll 1 after the second winding, that is, the timing when the pressing of the wrapper roll 1 against the steel sheet 3 is started are determined by lower pinch. The supply speed of the steel plate 3 detected by the pulse generator 6 attached to the roll 5, the laser light blocking timing detected by the laser projector 7 and the laser receiver 8,
That is, it is calculated based on the passing time of the tip.

The servo valve 9 performs CPC (Constant Position Control) control for keeping the wrapper roll 1 at a predetermined distance from the mandrel 2 until the steel plate 3 winds around the mandrel 2. The distance (gap) between the mandrel 2 and the wrapper roll 1
Is detected by the rotary magnescale 11 attached to the rotation fulcrum of each wrapper roll frame 10.

As described above, until one turn, the CPC that separates the wrapper roll 1 from the mandrel 2 by a predetermined distance is used.
Only the control is performed, but after one turn, the CPC control for separating the wrapper roll 1 from the mandrel 2 by a predetermined distance via the servo valve 9 at the timing when the tip of the steel plate 3 reaches each wrapper roll 1 and, in addition to this, When the tip of the steel plate 3 passes through the wrapper roll 1, CPR (constant pressure rolling) control for pressing the steel plate 3 at a constant pressure by the servo valve 9 is also performed.

A CPC control command and a CPR control command to the servo valve 9 are AJ based on detection signals from various sensors.
This is performed by the C control panel 12. In the case where the wrapper roll 1 merely generates a frictional force between the steel plate 3 and the mandrel 2 to facilitate winding, the CPR control is performed at the timing when the front end of the steel plate 3 first passes, and After the winding, the wrapper roll 1 may be separated from the steel plate to perform CPC control. In such a case, the problem of abnormal jump height as described later does not occur.

However, when it is necessary to switch from the CPC control to the CPR control when the wrapper roll 1 passes the above-mentioned tip of the steel sheet, or vice versa, it is necessary to switch these quickly. And
Realization of quick response is required.

If such a response is not made sufficiently quickly, especially when the wrapper roll 1 is working, the pressing force of the wrapper roll against the mandrel is controlled to a predetermined value. If the timing deviates, the wrapper roll 1 is flipped up when the tip of the steel sheet passes every rotation of the mandrel. Therefore, usually, the wrapper roll is jumped in a timely manner every time the tip of the steel sheet is turned to apply pressure while avoiding the tip of the steel sheet.

Therefore, if an abnormal condition such as a jump timing (tracking) shift occurs in the operation of the wrapper roll 1, a flaw or a roll pressing mark may be formed on the steel plate, thereby lowering the yield. In the past, such an abnormal operation of the wrapper roll was not accurate because the operator could see the jump height collection chart or detect the roll pressing mark on the product by the operator. Even if an abnormality occurs, it cannot be detected in real time, so product failures continue to occur until the user notices it, and the yield was inevitably reduced.

[0011]

SUMMARY OF THE INVENTION It is an object of the present invention to solve such a problem in the prior art and to enable automatic and real-time detection of an abnormal operation of a wrapper roll. An object of the present invention is to provide a roll jump height abnormality determination device.

[0012]

Means for Solving the Problems As means for achieving the above object, the present inventors compare the minimum positions of the jump height before and after the jump of the wrapper roll, and judge that the wrapper roll is abnormal when it exceeds a reference range. It has been found that it is effective to carry out the present invention, leading to the present invention.

That is, the present invention provides a jump height detecting means for detecting a jump height of a wrapper roll, a means for detecting a minimum value (Ync, min) of a wrapper roll height at the start of CPC control of the wrapper roll, Means for detecting a wrapper roll height minimum value (Ync ', min) during CPR control;
This is a failure monitoring device for a winding device, comprising: a wrapper roll jump height abnormality determining means for comparing these two values and determining an abnormality when the result is out of the following condition. (t−α) <(Ync ′, min−Ync, min) <(t + α) where, t: plate thickness α: constant (considering actual thickness variation etc.) Therefore, according to the present invention, the jump height of the wrapper roll In this case, the height detection means for detecting the jump height of the wrapper roll and the jump height detected before and after the jump of the wrapper roll are compared with a reference value to determine whether the height is outside this range. In this case, the abnormality is determined by the jump height abnormality determination means, and the operator is notified of the abnormality by an appropriate means, so that prompt recovery and elimination means can be taken.

[0014]

The jump height abnormality is caused by a collision with the front end of the steel plate due to a jump timing shift, an abnormality in the hydraulic system, and the like. Since such an abnormality first appears as insufficient jump height, the difference between the height of the wrapper roll before and after the jump is regarded as the jump height, and the height is determined by whether the amount is larger than the plate thickness. Is determined to be sufficient. Therefore, according to the present invention, since the determination is made for each jump, it is possible to detect a jump height abnormality accurately and in real time.

[0015]

An embodiment of the present invention will be described below. The apparatus according to the present invention will be described below with reference to FIG. The steel sheet winding device itself incorporating the abnormality determination device according to the present invention is the same as the conventional one shown in FIG. 1, which is as described above. FIG. 2 is a conceptual diagram showing the configuration of the fault monitoring device according to the present invention.

In FIGS. 1 and 2, the height of the wrapper roll 1 is measured using, for example, a rotary magnescale 11, and the data is sent to an AJC control panel 12, where the wrapper including a comparison device with a reference value is provided. The processing is performed by jump height detecting means for detecting the jump height of the roll 1. Especially,
Means for detecting the minimum value of the wrapper roll height (Ync, min) at the start of CPC control of the wrapper roll 1 and means for detecting the minimum value of the wrapper roll height (Ync ', min) during CPR control And this AJC control panel
It may be configured to be incorporated into 12.

Next, these two values are compared, and the arithmetic unit
The difference is calculated at 14 and then the difference is calculated as a reference value (t ±
α) is compared with the comparator 15, and when the thickness is substantially smaller than the steel sheet thickness or greatly deviates from the thickness, it is determined to be abnormal.
For example, when the jump height abnormality determining means of the wrapper roll at the time of the CPC control determines that there is an abnormality,
For example, the worker may be notified by appropriate means such as a buzzer.

That is, the wrapper roll height detection signal obtained from the rotating magnescale 11 is held by the sample and hold means 13 at the timing of starting the CPC control. The subtraction step 14 detects a difference in the wrapper roll height by subtracting the hold value from the wrapper roll height detection signal obtained after the end of the CPC control. The comparing means 15 compares the detected difference in the height of the wrapper roll with a reference value to determine a jump timing abnormality.

As described above, by using the apparatus according to the present invention, the wrapper roll 1 is moved from the mandrel 2 via the servo valve 9 at the timing when the tip of the steel plate 3 reaches each wrapper roll after the second turn. The CPC control is performed so that the jump is separated by a distance, that is, a jump is performed, and the jump height at that time is controlled so as to be always within a certain range.

When the tip of the steel plate 3 passes through the wrapper roll 1, the control is changed to CPR (constant pressure rolling) control in which the servo valve 9 presses the steel plate 3 at a constant pressure. The above determination by the device according to the present invention is performed for each jump. Therefore, abnormality detection is performed in real time, and product defects are minimized by prompt recovery.

FIG. 3 shows a CPC in the apparatus according to the present invention.
FIG. 4 is an explanatory diagram of control and CPR control timings. In the present invention, abnormality is determined based on a difference in wrapper roll height between position A and position B in the figure. FIG.
FIG. 3 is a schematic explanatory diagram of a specific determination method. This is a schematic view of the movement of the wrapper roll when the tip tracking is normal and when the tip tracking is abnormal.

In the normal state (A), the state before the start of CPC control and the state of CP
The difference in the height of the wrapper roll during the R control (when the plate and the wrapper roll are touching) is the difference in the plate thickness t. Therefore, the minimum height of the wrapper roll during the CPR control: Ync'min to the minimum height of the wrapper roll before the start of the CPC control: Ync min
, The jump timing is normal. The actual thickness may vary to some extent, and the constant α considering the play of the magnescale mounting part etc.
Considering the above, the accuracy increases.

An abnormal state (B) shows an example in which the stepped portion has passed during CPR control. In this case, the difference between the heights of the wrapper rolls before starting the CPC control and during the CPR control (when the plate and the wrapper roll are touching) is zero. Therefore, the minimum height of the wrapper roll during the CPR control: from Ync'min to the minimum height of the wrapper roll before the start of the CPC control: Ync m
If in is subtracted from 0, the jump timing becomes abnormal.

However, as described above, the value is not zero because of the influence of the play of the magnescale mounting portion and the like. Therefore,
Absolute value of difference in height of wrapper roll using constant β considering the effect of backlash etc. of scale mounting part | Ync'min -Ync mi
Comparing n |

The abnormal state (C) is when the CPR control is started, that is, when the wrapper roll matches with the step when the plate is pressed. In this case, the difference between the height of the wrapper roll before the start of the CPC control and the time of the CPR control (because the wrapper roll touches the plate) is smaller than the plate thickness and is not zero. Therefore, the value obtained by subtracting the minimum height of the wrapper roll before the start of the CPC control: Ync min from the final height of the wrapper roll during the CPR control: Ync'min is (t−
If it is smaller than α), it is determined to be abnormal.

As a method of determining a wrapper roll jump height abnormality, as disclosed in JP-A-3-180208,
By subtracting the hold value Pos (I) from the wrapper roll height detection signal Posc obtained momentarily in the control period to detect the wrapper roll height variations in the CPR control period, comparing the variation tolerance X _PR . And within the CPR control period,
Abnormality determining method is proposed when the> of X _PR condition occurs | Pos (I) -Pos.

[0027] However, the determination of the variation tolerance method (reference height variation range) X _PR is because of the difficulty by backlash or the like of a magnetic scale ages, there is a disadvantage that lacks accuracy. In addition, even if the allowable fluctuation value is determined once, the absolute value of the detected value is compared for the above-described reason. Therefore, in order to maintain the accuracy, the play of the magnescale must be constantly controlled.

Therefore, as in the present invention, the present invention for judging pass / fail of the jump timing by comparing the minimum position of the wrapper roll before and after the wrapper roll jumps can be a relative comparison between the detected values. Compared with the invention disclosed in 18208, the influence of the aging of the magnescale and the like is less.

[0029]

As described above, according to the present invention, jump timing abnormalities can be monitored automatically and in real time, so that operation abnormalities can be accurately and immediately determined to reduce product defects and to reduce the yield. Can be enhanced.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a winding device to which the device according to the present invention is applied.

FIG. 2 is a flowchart of a method of determining an abnormality in wrapper roll step avoidance control.

FIG. 3 shows CPC control and CP in the apparatus according to the present invention.
FIG. 9 is an explanatory diagram of R control timing.

FIG. 4 is a chart showing a specific method of determining a wrapper roll.

Claims (1)

(57) [Claims] 1. A jump height detecting means for detecting a jump height of a wrapper roll, a means for detecting a wrapper roll height minimum value (Ync, min) at the start of CPC control of the wrapper roll, and a jump height detecting means at the time of CPR control. A means for detecting the minimum value of the wrapper roll height (Ync ', min) and a means for comparing these two values and determining a jump height abnormality of the wrapper roll to determine that the result is abnormal when the result is out of the following conditions. A failure monitoring device for a wrapper roll in a winding device comprising: (t−α) <(Ync ′, min−Ync, min) <(t + α) where t: thickness α: constant (considering actual thickness variation etc.)