JPH0732017A - Point-tracking processing equipment for continuous line of steel sheet - Google Patents

Abstract

(57) [Summary] [Purpose] It enables accurate and rapid correction over the entire line. [Arrangement] A displacement amount calculating means 21 for calculating a displacement amount between a welding point and an actual welding point on tracking, a displacement amount history storing means 23 for storing the displacement amount in time series, and an alignment instruction. In this case, a correction amount calculation means 24 for calculating a deviation amount from the alignment fixed point as a correction amount, and a difference between the correction amount obtained by the correction amount calculation means 24 and the correction amount of the upstream singular point is set in advance. If the range is smaller than the given constant α, the same correction as this correction amount is executed,
If the range is larger than the constant value α, the correction amount determining means 25 for determining and executing the correction amount by proportional distribution is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a point / tracking processing device for a continuous steel thin plate line.

[0002]

2. Description of the Related Art Key points in a continuous line for thin steel plates
In a tracking system, tracking for a material is generally started at the time of completion of welding between the material and a preceding material already tracked.
In such a case, tracking does not deviate immediately after welding, and slippage gradually occurs due to slippage in the loop car and meandering in the acid tank. Usually, this amount of deviation is tracked based on the actual welding point position detected by a sensor (for example, a welding point detector, hereinafter referred to as WPD) arranged on the line and the speed of the transfer line. The position correction means for obtaining the difference from the position of the upper welding point and making this difference zero is automatically corrected.

Further, when a deviation that cannot be corrected occurs, the actual welding point is aligned with the alignment fixed point set on the line, and this point is forcibly set as the tracking point. Further, since the length of the coil, which is the material, does not change with respect to each welding point upstream of the alignment target point, the same amount of correction as the alignment point correction amount is uniformly applied.

[0004]

However, all welding points do not shift by the same amount over the entire line, and for example, slippage of the loop car occurs due to poor tension setting value of the loop car for a certain material type. Misalignment often occurs to the extent that automatic correction cannot be performed downstream of the loop car or within the loop car. In this case, there is a problem that the tracking is correctly performed at a certain point from the upstream of the line, and the tracking is deviated from the certain point. The conventional technology does not have a method of appropriately correcting the tracking deviation which shows such a tendency.

As described above, in the conventional tracking correction, if the point / tracking information and the welding point position on the actual material deviate to the extent that they cannot be corrected by the WPD, only one point can be corrected, or In the case of uniformly correcting all the lines, even upstream points that are correctly tracked are displaced, so that it is necessary to correct each time, and there is a problem that tracking correction becomes extremely difficult.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a point / tracking processing device in a continuous steel thin plate line which enables accurate and quick correction over the entire line. It is in.

[0007]

In order to achieve the above object, the first aspect of the invention is to track a singular point on a material in a continuous steel thin plate line as a tracking target, and an actual singular point for each detection point on the line. The actual singular point position is provided with a deviation amount calculating means for obtaining a deviation amount between the position and the singular point position on tracking, and a position correcting means for correcting the position for each detection point based on the obtained deviation amount. When the difference between the singular point position on the tracking and the position of the singular point exceeds the threshold value (correctable width) set in the position correcting means and the correction cannot be performed, the singular point is fixed to the alignment fixed point previously set on the line. In a tracking processing system for a continuous line of thin steel plates for executing a positioning process for matching points, the deviation amount for each detection point obtained by the deviation amount calculating means is shifted. Displacement amount history storage means for storing as amount history data, and a correction amount calculation means for obtaining a correction amount from the alignment fixed point position and the singular point position on tracking when the alignment instruction is output. The correction amount is compared with each deviation amount for each detection point stored in the deviation amount history storage means for the singular point existing upstream from the alignment instruction target singular point, and the difference is within a certain value. In some cases, the obtained correction amount is used as the correction amount of the upstream singularity, and when the difference exceeds the fixed value, a correction amount determining means for calculating and outputting a new correction amount is provided. It is characterized by including.

A second aspect of the invention is characterized by comprising threshold value resetting means for changing and resetting the threshold value after the alignment process is executed.

[0009]

According to the first aspect of the present invention having the above structure, the deviation amount for each detection point obtained by the deviation amount calculating means is stored as deviation amount history data.

When the alignment instruction is output, a correction amount is obtained from the alignment fixed point position and the singular point position on tracking, and the detection amount and the detection point stored in the shift amount history storage means. Each deviation amount is compared with each other, and when the difference is within a fixed value, the obtained correction amount is set as a correction amount, and when the difference exceeds the fixed value, a new correction is performed. Calculate and output the quantity.

According to the second aspect of the invention, when the difference between the actual singular point position and the singular point position on the tracking cannot be corrected so much that it exceeds the threshold value set in the position correcting means, the correction cannot be performed. , After performing the alignment process to match the singular point with the alignment fixed point set on the line in advance,
Reset the threshold to a new value.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing the functional configuration of a point / tracking processing device in a continuous steel thin plate line according to the present invention, and FIG. 2 shows the overall configuration of a point / tracking processing device in a continuous steel thin plate line. It is a block diagram.

FIG. 2 shows a composite continuous line consisting of a pickling line and a cold rolling line.
The thin plate material 2 wound around is conveyed by the loop car 3 while maintaining a predetermined tension, and washed by the pickling tank 4. The thin plate material 2 after cleaning is rolled into a predetermined plate thickness by a mill 5, cut into a predetermined length by a shear 6 and wound on a tension reel 7.

A welding machine 8 is installed on the transfer line between the payoff reel 1 and the loop car 3 to enable continuous rolling by welding the thin plates of the payoff reels 1.

A pulse transmitter 9 is provided between the loop car 3 and the pickling tank 4 to measure the speed of the thin plate conveying line.

Further, in the present embodiment, the welding point detectors 10 are provided at three positions, ie, the pickling tank inlet side and outlet side, and the mill inlet side.
a, 10b, and 10c are provided, and the spot welded by the welder 8, that is, a singular point is detected.

Positioning fixed points 11 are set at two positions between the welding point detectors 10b and 10c and between the welding point detector 10c and the inlet of the mill 5.

The welding completion signal S8 of the welding machine 8, the PLG carrier signal S9 of the pulse generator 9 and the welding point detector signals of the respective welding point detectors 10a, 10b and 10c (hereinafter W).
S10a, S10b, and S10c are called PD signals.
Is supplied to the / O device 12. This I / O device 12
Are connected to a high-order computer 14 and a low-order PLC (programmable logic controller) 15 via a control LAN 13. In the present embodiment, the point tracking is executed by the high-order computer 14, but it may be executed by the low-order PLC 15.

As shown in FIG. 1, the host computer 14 is functionally provided with a shift amount calculating means 21, a shift amount history storing means 23, a correction amount calculating means 24, and a correction amount determining means 25.
And threshold value resetting means 26.

The deviation amount calculating means 21 includes the welding completion signal S8 and the PLG transfer signal S supplied from the I / O device 12.
9, and each WPD signal S10a, S10b, S10c
Based on the above, each deviation amount between the welding point on the tracking and the actual welding point is calculated, and the deviation amount is supplied to the position correction means 22 and the deviation amount history storage means 23.

The position correction means 22 has a normal automatic correction function, compares the supplied deviation amount with a preset threshold value (correction allowable range), and detects the deviation amount as a threshold value. If it is within the range, the deviation amount is output as a correction amount.

The deviation amount history storage means 23 is composed of a magnetic disk device or the like for storing the calculated deviation amounts in time series.

The correction amount calculating means 24, when a position alignment instruction is issued, the position alignment fixed point 1 set on the line.
The amount of deviation from the tracking position in 1 is calculated as the correction amount.

If the difference between the correction amount obtained by the correction amount calculating means 24 and the correction amount of the singular point on the upstream side is smaller than a preset constant value α, the correction amount determining means 25 , The same correction as this correction amount is executed. If the range is larger than the constant value α, the correction amount is determined by proportional distribution and executed.

The threshold value resetting means 26 edits the deviation amount for each welding point detector 10a, 10b, 10c from the deviation amount history of each welding point stored in the deviation amount history storing means 23, and aligns the position. If the type of material existing upstream at the time of the instruction is the same as the type of material in which the welding point deviation amount is recorded, the range of automatic correction by the position correcting means 22 is reset with the deviation amount stored up to that point. This resetting process is executed periodically, the amount of deviation is monitored, and the WPD correction amount is set gradually smaller.

Next, the operation of this embodiment will be described with reference to FIGS.

<Displacement amount history storage process> In the following description,
As each welding point detector goes downstream, WPD _j , W
, PD _{(j + 1)} , ..., WPD _{(j + m),} and P _i , P _{(i + 1)} , ..., P _{(i + n) as} each welding point goes upstream. .

As shown in FIG. 3, the deviation amount calculating means 21 finds the deviation amount of the welding point P _i in the welding point detector WPD _{j as} L ″ _ij, and the welding point detector WPD of this welding point P _{i. If} the shift amount at _{(j + m)} is calculated as L ″ _{i (j + m)} ,
As shown in FIG. 4, each welding point P _i , P _{(i + 1)} , ..., P
_For each _{(i + n)} , each welding point detector WPD _j , WPD _{(j + 1)} ,
The deviation amount and the material type in WPD _{(j + m)} are stored in the deviation history storage means 23 as deviation amount history data.

<Correction Amount Determination Process> Next, the correction amount determination process will be described with reference to the explanatory view of FIG. 5 and the flowchart of FIG.

As shown in FIG. 5, the welding point P _i is L
_i (m) are modified, for P from the welding point P _{(i + 1)} located upstream of the welding point P _{i (i + n),} respectively L
_{Assuming that only (i + 1)} (m) and L _{(i + n)} (m) are modified, the process of determining this modification amount as a correction amount is executed as follows.

When the alignment command is given, first, the difference between the alignment fixed point 11 and the tracking information of the target welding point P _i is calculated to obtain the position correction amount L _i (step ST1 in FIG. 6).

Next, the deviation amount L "between each welding point P _{(i + n)} (n = 1,2, ...) upstream of the target welding point P _i and the actual welding point"
_{The difference between (i + n) j} and the deviation amount L ″ _ij between the actual welding point of the target welding point P _i is obtained (step ST2).

ΔL ″ _{i (i + n) j} = L ″ _ij −L ″ _{(i + n) j} (1) If the obtained difference ΔL ″ _{i (i + n) j} is less than a constant value α (Step ST3 YES), the tracking correction amount of the welding point P _{(i + n)} is set to L _i similarly to the target welding point P _i (step ST4).

The calculated difference ΔL ″ _{i (i + n) j} is equal to or greater than the constant value α, and the deviation amount history L _{(i + n) j of the} welding point P _{(i + n)} is the correction range of WPD _j . If it exceeds (step ST3N
O, ST5 YES), the correction amount of P _{(i + n)} is proportionally calculated by the following equation (step ST6).

L _{(i + n)} = L _i × L ″ _{(i + n) j} / L ″ _ij (2) Further, when the obtained difference ΔL ″ _{i (i + n) j} is a constant value α or more. Yes, and the welding amount history L _{(i + n) j of the} welding point P _{(i + n )} is WPD
_If the correction range of _j is not exceeded (step ST3 NO,
₍ ST5NO), P _{(i + n)} deviation correction is unnecessary (step ST7).

The above steps ST2 to ST7
The processing up to the above is executed for all the detected upstream welding points (step ST8).

By executing the correction amount determining process in this way, even if the welding point position on the tracking is deviated from the actual welding point position, all welding points on the upstream side of the welding point to be aligned are detected. On the other hand, the tracking position can be corrected to the actual position.

<Threshold Resetting Process> Next, the threshold resetting process executed at the time of welding point alignment in the WPD _j correction range setting process will be described.

With respect to WPD _j in which the deviation exceeding the correction range is recorded from the deviation amount history of the welding point P _{i to be} aligned, each of the passed welding points P _{(i + n)} (n = 0 to) A deviation amount L ″ _{(i + n) j} is obtained (step ST11).

Next, if the deviation amount L ″ _LASTj of P _LAST that has passed the last WPD _j exceeds the threshold value (steps 12YES, ST13YES), the maximum value L ″ _jmax in the deviation amounts is _set . A value obtained by adding the constant β is reset as a new correction range of WPD _j , that is, a new threshold value (step ST14).

Further, the deviation amount L _"LASTj does not exceed the correction range (step ST13NO) is, upstream of the coil than WPD _j keeps track of the shift exceeds the correction range, and the coil is detected the P _LAST When the coil is of the same type (YES in step ST15), similarly, the maximum value L ″ _jmax + β (β is a constant) in the deviation amount is reset as the correction range of WPD _j , that is, the threshold value (step ST).
14).

On the other hand, shift amount L _"LASTj does not exceed the correction range when (step ST13NO), and upstream of the coil than WPD _j is not coil the same type which records the deviation exceeds a correction range (step ST15NO) Is WPD
_It is not necessary to change the correction range of _j (step ST1)
6).

Therefore, by executing this threshold value resetting process, it is possible to automatically correct the deviation that occurs in a certain type of material due to an inappropriate threshold value, and always make an appropriate adjustment according to the material type. Correction is possible.

<Threshold Threshold Restoration Process> FIG. 8 shows that the new correction range (threshold value) set in the threshold value resetting process is monitored during the normal operation after the alignment is completed, and a certain standard is set. A process procedure for returning to the original correction range when the condition is satisfied is shown.

When the deviation of WPD _j does not exceed the threshold value (correction range) (YES in step ST21), the deviation amount of WPD _j is evaluated every time the welding point passes, and the phenomenon of exceeding the threshold value occurs t times. It is checked whether or not they appear continuously (step ST21). When continuous (step ST22
YES), the maximum value L ″ _tjmax of the deviation history for t times is _obtained from the deviation amount history storage means 23 (step ST2).
3).

When the maximum value L " _tjmax is smaller than the lower limit value of the threshold value, the lower limit value is set as a new threshold value (steps ST24 YES, ST25), and the maximum value L" _{tj max} is the threshold value. Is greater than the lower limit of
A value obtained by adding the constant γ to the maximum value L ″ _tjmax is set as a new threshold value (steps ST24NO, ST26).

On the other hand, the phenomenon that the deviation amount exceeds the threshold value is t
If not consecutively (step ST22 NO), W
PD _j is not changed (step ST27).

Therefore, by this threshold value restoration processing, correction processing with an appropriate threshold value is always possible.

[0049]

As described above, according to the present invention, even when the singular point position on tracking is deviated from the actual singular point position, all the singular points on the upstream side of the alignment target singular point are detected. On the other hand, the tracking position can be corrected to the actual position.

Further, the threshold value (correction range) set in the position correction means can be reset to an appropriate value, and accurate correction according to the material type can be performed.

[Brief description of drawings]

FIG. 1 is a block diagram showing a functional configuration of a point / tracking processing device in a steel thin plate continuous line according to the present invention.

FIG. 2 is a block diagram showing an overall configuration of a point / tracking processing device in a steel thin plate continuous line.

FIG. 3 is an explanatory diagram showing a shift correction process.

FIG. 4 is an explanatory diagram showing an example of data stored in a shift amount history storage unit.

FIG. 5 is an explanatory diagram showing a correction process when a position alignment command is issued.

FIG. 6 is a flowchart showing a procedure of correction amount determination processing.

FIG. 7 is a flowchart showing a procedure of threshold value reset processing.

FIG. 8 is a flowchart showing a procedure of threshold value restoration processing.

[Explanation of symbols]

 1 Payoff reel 2 Thin plate material 3 Loop car 4 Pickling tank 5 Mill 6 Shear 7 Tension reel 8 Welder 9 Pulse transmitter 10a, 10b, 10c Welding point detector 11 Positioning fixed point 12 I / O device 13 Control LAN 14 Upper Calculator 15 Lower programmable controller 21 Deviation amount calculation means 22 Position correction means 23 Deviation amount history storage means 24 Correction amount calculation means 25 Correction amount determination means 26 Threshold value resetting means

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Claims (2)

[Claims] 1. A deviation amount calculating means for obtaining a deviation amount between an actual singular point position and a singular point position on tracking for each singular point on a material in a continuous line of a thin steel plate and tracking target. And a position correction means for performing position correction for each detection point based on the obtained deviation amount, and the difference between the actual singular point position and the singular point position on tracking is set in the position correction means. If the deviation cannot exceed the threshold value and cannot be corrected, a point tracking system in a continuous line for thin steel plates that executes a positioning process to match the singular point with the positioning fixed point set on the line in advance is used. A displacement amount history storage unit that stores the displacement amount for each detection point obtained by the amount calculation unit as displacement amount history data, and an alignment finger. Is output, a correction amount calculation means for obtaining a correction amount from the alignment fixed point position and the singular point position on tracking, and the singularity existing upstream of the obtained correction amount and alignment instruction target singular point. Point is compared with each deviation amount for each of the detection points stored in the deviation amount history storage means, and if the difference is within a certain value, the obtained correction amount is set to the upstream singular point. When the difference exceeds the constant value as a correction amount, the correction amount determining means for calculating and outputting a new correction amount, and Tracking processor. 2. The point tracking processing device in a continuous line for steel thin plates according to claim 1, further comprising a threshold value resetting means for changing and resetting the threshold value after the alignment processing is executed. A point / tracking processing device for a continuous line for thin steel plates, which is characterized by being provided.