JPH11106973A - Tracking device of specific point of metallic strip in continuous pickling equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the tracking accuracy, and to reduce the installation number of a weld point detector in a continuous pickling equipment in which a rolling mill is provided on the inlet side of a pickling tank. SOLUTION: A weld point detector obtains the required movement distance of the weld point of a steel strip 3 from a first weld point detector 23 to a trimmer device 11 based on the set values of the thickness ratio and the catenary quantity of a pickling tank, and transmits the reach signal when the actual movement distance of the weld point measured by a movement distance detector 25 is agreed with the obtained required movement distance. A learning circuit 35 obtains the catenary learning value based on the deviation between the set value of the catenary quantity and the practical value. The tracking accuracy is improved because the tracking circuit 34 and the learning circuit 35 are provided. The installation number of the weld point detectors can be reduced because the tracking is operated based on the movement distance of the weld point.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous pickling facility, and more particularly to a continuous pickling facility having a rolling mill on the inlet side of a pickling tank, for determining whether or not a singular point of a metal strip has reached a predetermined position. The present invention relates to a tracking device for detecting.

[0002] In the present specification, the term "singular point" refers to a predetermined intermediate position in the longitudinal direction of a metal strip such as a steel strip, and represents, for example, a thickness change point, a sheet width change point, and a steel type change point. I have. The singular point usually means a welding point where these changes are made, and when these changes are made in the same material, it means a manufacturing change point.

[0003]

2. Description of the Related Art Conventionally, a continuous pickling facility for continuously transporting a metal strip, for example, a hot-rolled steel strip (hereinafter, may be abbreviated as a steel strip) to remove oxide scale, is installed in the equipment. In order to give the control timing of various devices
When a singular point of the steel strip reaches a predetermined position, a so-called tracking process of transmitting a reaching signal is performed.

[0004] The tracking process is usually performed by providing a detector for detecting a singular point of a steel strip at a predetermined position. Therefore, as the number of the singular point detectors increases, the tracking accuracy improves. In continuous pickling equipment, since the plate length increases due to the hanging of the steel strip in the pickling tank, the tracking accuracy tends to decrease, especially in continuous pickling equipment equipped with a rolling mill on the entrance side of the pickling tank, Since a factor of lowering the tracking accuracy such as an increase in the plate length is added, the tracking accuracy is more likely to be lowered. Therefore, conventionally, a large number of singularity detectors are installed in the continuous pickling equipment.

[0005]

As described above, in the continuous pickling equipment, tracking accuracy is improved by providing a large number of singular point detectors. However, providing a large number of singular point detectors has problems such as an increase in equipment cost and an increase in the risk of failure. Furthermore, in equipment having a high occupancy rate of the pickling tank, such as continuous pickling equipment, there is a restriction on the position where the singularity detector can be installed, and it is difficult to install the singularity detector at a desired position. However, there is a problem that tracking accuracy is reduced.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide a tracking device for a singular point of a metal strip in a continuous pickling facility which has good tracking accuracy and can greatly reduce the number of singular point detectors to be installed. Is to provide.

Another object of the present invention is to provide a continuous pickling facility having good pickling efficiency and good tracking accuracy.

[0008]

SUMMARY OF THE INVENTION The present invention provides a continuous pickling facility provided with a rolling mill on the entrance side of a pickling apparatus. When a singular point of a traveling metal strip reaches a predetermined position, a continuous pickling signal is output. In a tracking device for transmitting to a predetermined device of the washing equipment, a first singularity detecting means provided on an entrance side of a rolling mill and detecting a singularity of a traveling metal band, a pickling tank, and a traveling direction of the metal band. A second singularity detecting means provided on the output side of the pickling apparatus having a supporting roll and a support roll arranged at intervals, and detecting the singularity of the traveling metal strip, provided on the entrance side of the rolling mill, A moving distance detecting means for measuring the moving distance of the singular point of the metal strip from the installation position of the first singular point detecting means as a starting point, and a sheet thickness ratio between a sheet thickness before rolling and a sheet thickness after rolling of the metal strip or A calculating means for obtaining a ratio corresponding to the plate thickness ratio, and a metal strip in the pickling tank The amount of increase in the sheet length due to drooping is set in advance, and based on the output of the moving distance detecting means, the output of the calculating means, and the set value of the amount of increase in the sheet length, the singular point of the metal strip is shifted in the traveling direction of the metal strip relative to the rolling mill It is determined whether or not it has reached a predetermined position on the downstream side, and when the singular point of the metal band reaches the predetermined position, an arrival signal is transmitted to a predetermined device of the continuous pickling equipment, and the output of the second singular point detecting means, A tracking unit that corrects and updates the set value of the plate length increase amount based on the output of the moving distance detection unit, the output of the calculation unit, and the set value of the plate length increase amount. Is a tracking device for a singular point of a metal band in a continuous pickling facility.

According to the present invention, since the tracking processing of the singular point of the metal band is performed by calculation based on the moving distance of the singular point of the metal band, the singular point detection which is a means for directly detecting the singular point of the metal band. The number of means to be installed can be greatly reduced as compared with the related art. In addition, the tracking processing is performed in consideration of an increase in the plate length due to rolling, which is a factor that lowers the tracking accuracy, and an increase in the plate length due to the hanging of the metal band in the pickling tank, so that the tracking accuracy is improved.

[0010] The tracking means of the present invention comprises: a memory for storing a predetermined correspondence relationship between a thickness, a width, and a specific gravity of the metal band and a set value of the amount of increase in the length of the metal band; Result collection processing for obtaining the set values of the plate length increment corresponding to the plate thickness, plate width and specific gravity based on the correspondence stored in the memory, and collecting the outputs of the moving distance detecting means and the calculating means. From the circuit and the singular point of the metal strip passing through the first singular point detecting means to reaching one or more predetermined positions on the rolling mill exit side including the installation position of the second singular point detecting means. The required moving distance is determined based on the determined thickness ratio or the ratio corresponding to the thickness ratio, and the set value of the plate length increase amount, respectively, and the measured value of the moving distance detection means determines the required required movement. When the distance matches, the singularity of the metal band A signal indicating that the vehicle has reached a predetermined position, a tracking processing circuit for transmitting the signal to a predetermined device of the continuous pickling equipment, and the required moving distance obtained from the first singularity detecting means to the second singularity detecting means. Calculating the deviation from the measured value of the moving distance detecting means when the singular point of the metal band reaches the second singular point detecting means, adding the obtained deviation to the set value of the plate length increase amount, and A learning processing circuit for determining a correction value of the length increase amount and updating a set value of the plate length increase amount stored in the memory based on the obtained correction value.

According to the present invention, the required moving distance is obtained in the tracking processing circuit, and when the actual moving distance measured by the moving distance detecting means coincides with the obtained required moving distance, an arrival signal is transmitted. In addition, it is possible to accurately track the singular point of the metal band. In the learning processing circuit, the deviation is obtained,
A correction value of the plate length increase amount is obtained based on the deviation. Since the deviation represents the difference between the set value of the plate length increase and the measured value, the obtained correction value appropriately reflects the operation results. Further, since the set value of the plate length increase stored in the memory is updated based on the obtained correction value, the proper plate length increase is always set during operation, and a high-precision tracking process is performed. Can be maintained.

According to the present invention, there is provided an acid pickling tank for removing an oxidized scale of a metal strip, comprising a pickling tank, and a supporting roll disposed at intervals in a running direction of the running metal strip, and a pickling apparatus. A rolling mill provided on the entry side of the apparatus and rolling the metal strip; first singularity detection means provided on the entry side of the rolling mill and detecting a singularity of the traveling metal strip; And a second singularity detecting means for detecting a singular point of the traveling metal strip, and a moving distance of the singularity of the metal strip provided on the entry side of the rolling mill, and the installation position of the first singularity detecting means. Moving distance detecting means for measuring from the starting point, a first thickness detecting means for detecting the thickness of the metal strip before rolling, a second thickness detecting means for detecting the thickness of the metal strip after rolling, and In response to the outputs of the first and second sheet thickness detecting means, the sheet thickness ratio between the sheet thickness before rolling and the sheet thickness after rolling is obtained. Means for calculating a ratio corresponding to the sheet thickness ratio, and an amount of plate length increase due to the hanging of the metal band in the pickling tank is set in advance, and the output of the moving distance detecting means, the output of the operation means and the amount of increase of the sheet length are set. Based on the set value, it is determined whether or not the singular point of the metal band has reached a predetermined position on the downstream side of the rolling direction of the metal band from the rolling mill, and when the singular point of the metal band has reached the predetermined position, an arrival signal is generated. The plate length increase amount is transmitted to a predetermined device of the continuous pickling facility, and based on the output of the second singularity detection means, the output of the moving distance detection means, the output of the calculation means, and the set value of the plate length increase amount. And a tracking unit that corrects and updates the set value of the pickling apparatus.

According to the present invention, since the rolling mill is provided on the inlet side of the pickling apparatus, cracks are generated in the oxide scale, and the pickling time can be greatly reduced. Further, since the tracking function and the learning function are provided, the tracking processing of the singular point of the metal band can be performed with high accuracy.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing a simplified structure of a continuous pickling facility according to an embodiment of the present invention and a tracking device for a singular point of a metal strip provided therein. The continuous pickling facility 1 is a facility for sequentially welding and joining a metal strip, for example, a hot-rolled steel strip 3 having an oxide scale (hereinafter abbreviated as a steel strip), and continuously transporting the strip to remove the oxide scale. . The continuous pickling equipment 1 includes first to third
It includes bridle rolls 4 to 6, first and second sheet thickness detecting means 7 and 8, rolling mill 9, pickling device 10, trimmer device 11, and tracking device 13.
The first bridle roll 4, the first thickness detecting means 7, the rolling mill 9, the second thickness detecting means 8, the second bridle roll 5, the pickling device 10, the third bridle roll 6, and the trimmer device 11 are steel strips. 3 are arranged in this order from the upstream side in the traveling direction.

The first bridle roll 4 and the second bridle roll 5 are provided on the entrance and exit sides of the rolling mill 9, respectively, and control the tension of the steel strip 3 during rolling to a predetermined value. The 2nd bridle roll 5 and the 3rd bridle roll 6 are provided in the entrance and exit of the pickling apparatus 10, respectively, and control the tension of the steel strip 3 during pickling to a predetermined value. A first thickness gauge 7 serving as a first thickness detecting means is provided on the entry side of the rolling mill 9 and measures the thickness of the steel strip 3 before rolling by X-rays. A second thickness gauge 8, which is a second thickness detecting means, is provided on the exit side of the rolling mill 9, and measures the thickness of the steel strip 3 after rolling by X-rays. The rolling mill 9 is, for example, a four-high rolling mill, and cold rolls the steel strip 3 having the oxide scale to a predetermined thickness. Cold rolling is performed while spraying a rolling agent such as water. Therefore, the second bridle roll 5 contacts the steel strip 3 in a wet state, and the first bridle roll 4 contacts the steel strip 3 in a dry state. Further, since cracks are generated in the oxide scale of the steel strip 3 by the cold rolling, the pickling property in the subsequent pickling apparatus 10 is greatly improved.

The pickling apparatus 10 includes a pickling tank 16 and a plurality of support rolls 17 as shown in FIG. The pickling tank 16 is a steel container for storing a pickling solution 18, for example, an aqueous hydrochloric acid solution, and its inner surface is lined with an acid-resistant synthetic resin. The support roll 17 is, for example, a steel roll coated with an acid-resistant synthetic resin film, and rotatably supports the traveling steel strip 3 at intervals in the traveling direction. Support roll 17
The steel strip 3 hangs down between the supporting rolls 17 and is immersed in the pickling solution 18.
The amount of droop of the steel strip 3 is determined by the weight of the steel strip 3 and the tension of the steel strip 3, and the amount of droop increases as the self-weight increases and as the tension decreases. Normally, the tension of the steel strip 3 is kept substantially constant, so the amount of droop of the steel strip 3 is determined by the weight of the steel strip 3. When the amount of droop of the steel strip 3 increases, the length of the steel strip 3 in the pickling tank 16 increases. The pickling tank 1
In FIG. 6, the sheet length increase ΔL due to the hanging of the steel strip 3
As shown in (1), when the plate length of the steel strip 3 in the hanging state is L1 and the plate length of the steel strip 3 in the non-hanging state is L2, (1)
It is represented by an equation. Hereinafter, the amount of increase in the plate length due to the hanging of the steel strip 3 is referred to as the catenary amount. ΔL = L1−L2 (1)

The trimmer device 11 is a device for trimming the end of the steel strip 3 after pickling to a predetermined product width. When changing the trimming width, the trimmer device 11 and the steel strip 3 are removed. Stop and change the trimming width setting. A trimmer control device 20 is connected to the trimmer device 11. When the singular point (hereinafter, referred to as a welding point) of the traveling steel strip 3 reaches a predetermined position, the tracking device 13 transmits a reaching signal to a predetermined device corresponding to the predetermined position, for example, a trimmer control device 20 or the like. And has a configuration as described later.

The steel strip 3 is welded at a welding machine (not shown) provided upstream of the first bridle roll 4 at a rear end of the preceding material and a front end of the following material. A hole having a diameter of about 20 mm was punched at the welding point on the delivery side with a puncher, cold-rolled by a rolling mill 9, oxidized scale was removed by a pickling device 10, a plate end was trimmed by a trimmer device 11, and a trimmer device was formed. It is cut by a cutting machine (not shown) provided on the downstream side of 11 and wound up by a winding device (not shown).

The tracking device 13 includes first singularity detecting means 23, second singularity detecting means 24, moving distance detecting means 25, calculating means 26, and tracking means 27. A first welding point detector 23 (hereinafter, referred to as a first WPD), which is a first singular point detecting means, is a hole detector including a light projector and an optical sensor, and is fixed near the first bridle roll 4. Position. The first WPD 23 detects a hole formed at the welding point of the steel strip 3 and transmits a detection signal. A second welding point detector 24 (hereinafter, referred to as a second WPD) serving as a second singularity detecting means.
Is a hole detector provided close to the entry side of the trimmer device 11, and its configuration is exactly the same as that of the first WPD 23. The weld itself may be directly detected by an eddy current sensor instead of the hole detector.

Moving distance detector 2 as moving distance detecting means
5 includes a pulse generator 29 and a pulse counter 30. The pulse generator 29 is attached to the first bridle roll 4, and the number of generated pulses is counted by a pulse counter 30. As described above, the first bridle roll 4 comes into contact with the steel strip 3 in a dry state and no slip occurs, so that the rotation speed of the first bridle roll 4 and the traveling speed of the steel strip 3 match. Therefore,
The moving distance detector 25 can accurately measure the moving distance of the welding point of the steel strip 3 from the installation position of the first WPD 23 as a starting point. The calculator 26, which is a calculating means, responds to the output of the first thickness gauge 7 and the second thickness gauge 8, and calculates the thickness ratio between the thickness t0 of the steel strip 3 before rolling and the thickness t1 of the steel strip 3 after rolling. α (= t0
/ T1) is calculated. Instead of the plate thickness ratio, a speed ratio between the plate speed after rolling and the plate speed before rolling, which is a ratio corresponding to the plate thickness ratio, may be calculated.

The tracking means 27 is realized by a computer, and comprises a memory 31 and a result collection processing circuit 33.
, A tracking processing circuit 34, and a learning processing circuit 35. The memory 31 is a data storage unit. The memory 31 stores the correspondence between the thickness, the width, and the specific gravity (steel type) of the steel strip 3 and the set value of the catenary amount in the pickling tank 16 in FIG. It is stored as a learning table as shown. Since the catenary amount increases as the weight of the steel strip 3 increases, the learning table shown in FIG. 3 is set so that the catenary amount increases as the plate thickness and the plate width increase. Therefore, the plate thickness is 3.
Set value a (m) of catenary amount of 0 mm and width of 1000 mm
m) is smaller than the set value b (mm) of the catenary amount when the plate thickness is 3.2 mm and the plate width is 1000 mm. This correspondence is predetermined for each steel type.

The result collection processing circuit 33 responds to a command from the operation command transmitting device 36 which is a host computer, and instructs the thickness, width and type of catenary corresponding to the commanded steel strip 3 to be passed. The set value is extracted from the learning table. Further, the result collection processing circuit 33 collects the outputs of the moving distance detector 25 and the calculator 26.

The tracking processing circuit 34 determines whether or not the welding point has reached a predetermined position based on the moving distance of the welding point of the running steel strip 3, and determines that the welding point has reached the predetermined position. The processing circuit transmits a reaching signal to a predetermined device corresponding to a predetermined position when the signal arrives. The predetermined position is set in advance at one or more positions downstream of the rolling mill 9. As the predetermined position, the trimmer device 11,
An installation position of each device constituting the continuous pickling equipment such as a cutting machine and a winding device is selected, and a control start position of each device is selected. In the present embodiment, the installation position of the trimmer device 11 and the control start position 37 of the trimmer device 11 are selected as the predetermined positions, and the trimmer control device 20 is selected as the predetermined device corresponding to the predetermined position. The arrival of the welding point at the predetermined position is determined by calculating the required moving distance from when the welding point passes through the installation position of the first WPD 23 to when the welding point reaches the predetermined position, and is a measured value of the moving distance detector 25. This is performed by determining whether the moving distance matches the required moving distance obtained above.

The required moving distance Ltr (m) from when the welding point passes through the first WPD 23 to when it reaches the trimmer device 11
m) is calculated by equation (2). Ltr = Lti + {(Ltj + Lct) / α} (2) where Lti: the equipment distance (mm) from the first WPC 23 to the rolling mill 9 Ltj: the equipment distance (mm) from the rolling mill 9 to the trimmer device 11 Lct: Catenary amount

(Ltj + Lct), which is the required moving distance of the welding point after rolling in the second term on the right side of the equation (2), is divided by the sheet thickness ratio α. This is for converting the required moving distance of the welding point before rolling. In this way, the required moving distance of the welding point after rolling is converted into the required moving distance of the welding point before rolling, because the moving distance detector 25 is provided on the entrance side of the rolling mill 9. . Further, in the present embodiment, since the moving distance is measured by the pulse generator 29 and the pulse counter 30,
The moving distance can be converted into a count value of the pulse counter 30.

The required pulse integrated value Ptr from when the welding point passes through the first WPD 23 until it reaches the trimmer device 11
(Pulse) is expressed by Expression (3), where Ptr in the first WPD 23 is set to zero. Ptr = Ltr / Rbr (3) where, Rbr: pulse rate of first bridle roll 4 (mm / pulse)

As a result, the required moving distance Ltr from when the welding point passes through the first WPD 23 to when the welding point reaches the trimmer device 11 is converted into the required pulse integrated value Ptr. When the count value Ppi of the pulse counter 30 representing the actual travel distance) reaches Ptr, it is determined that the welding point has reached the trimmer device 11.

The required moving distance from when the welding point passes through the first WPD 23 to when the welding point reaches the control start position 37 of the trimmer device 11 is similarly calculated as the required pulse integrated value Ptc (pulse).
Is converted to The required pulse integrated value Ptc is (4),
It is calculated by equation (5). Ptn = Ntr / Rbr / α (4) where Ptn: a required pulse integrated value (pulse) from when the welding point passes through the control start position 37 to when it reaches the trimmer device 11 Ntr: a trimmer from the control start position 37 Distance to device 11 (mm) Ptc = Ptr−Ptn (5)

Thus, when the count value Ppi of the pulse counter 30 reaches Ptc, it is determined that the welding point has reached the control start position 37. In addition, when it is determined that the welding point has reached the control start position 37 and the trimmer device 11, the tracking processing circuit 34 transmits an arrival signal to the trimmer control device 20.

The learning processing circuit 35 obtains a deviation between the set value of the catenary amount and the actual value, adds the obtained deviation to the set value of the catenary amount, obtains a correction value of the catenary amount, A processing circuit for updating a set value of the corresponding catenary amount in the learning table based on the corrected value. The deviation is obtained by calculating a difference between a required moving distance from when the welding point passes through the first WPD 23 to reach the second WPD 24 and an actual moving distance when the welding point reaches the second WPD 24. The deviation is obtained in this way because the required movement distance includes the set value of the catenary amount, the actual movement distance includes the actual value of the catenary amount, and the catenary This is because the portions other than the pickling tank 16 related to the amount are the same and have no difference in distance. Note that the first WPD2
Since the distance from 3 to the rolling mill 9 is the same both when calculating the required moving distance and when calculating the actual moving distance, it can be excluded in the calculation of the deviation. Therefore, the calculation of the deviation is performed with respect to the distance from when the welding point passes through the rolling mill 9 to when the welding point reaches the second WPD 24.

After the welding point has passed through the rolling mill 9, the second WP
The actual moving distance Lcr (mm) until reaching D24 is calculated by equation (6). Lcr = (Pct · Rbr−Lti) × αav (6) where, Pct: the integrated pulse value (pulse) of the pulse counter 30 when the welding point reaches the second WPD24, αav: the welding point passes through the first WPD23. And then the second W
Average value of thickness ratio α to reach PD24

When the welding point passes through the rolling mill 9, the second WPD 2
The required moving distance Lxx (mm) required to reach 4 is calculated by equation (7). Lxx = Ltk + Lct (7) where, Ltk: equipment distance from the rolling mill 9 to the second WPD 24 (mm).

The deviation Lln between the set value of the catenary amount and the actual value is calculated by equation (8). Lln = Lxx−Lcr (8)

However, the deviation Lln is used for calculating the correction value of the catenary amount only when the following expression (9) is satisfied. This is because the first WPD 23 and the second WPD 2
This is to prevent an error in the correction value of the catenary amount due to erroneous detection of No. 4 from being reflected in the learning table. Llnmin ≦ Lln ≦ Llnmax (9) where Llnmin: the lower limit of the deviation Llnmax: the upper limit of the deviation

The catenary learning value Lctnew, which is a correction value of the catenary amount, is calculated by the equation (10). Lctnew = Lct + Lln (10)

The calculation cycle of the tracking processing circuit 34 and the learning processing circuit 35 is set by a cycle timer 38. The calculation cycle is, for example, 50 msec.

As described above, in the continuous pickling equipment of the present embodiment, since the rolling mill 9 is provided on the entrance side of the pickling apparatus 10, pickling is performed in a state where cracks are formed on the oxide scale by rolling. Can be performed, and the pickling efficiency can be greatly improved. Further, since the tracking device 13 including the tracking processing circuit 34 and the learning processing circuit 35 is provided, highly accurate tracking processing can be performed.

FIG. 4 is a flow chart for explaining the operation of the tracking processing circuit of the tracking device shown in FIG. The operation is started in step s1, and an operation command is issued in step s2. The operation command is instructed by the operation command transmitting device 36, and the sheet thickness, the sheet width, and the steel type of the steel strip 3 to be passed are sent to the result collection processing circuit 33. In step s3, the welding point passes through the first WPD 23, and a passing signal is transmitted from the first WPD 23. In step s4, the set value Lct of the catenary amount corresponding to the sheet thickness, the sheet width, and the steel type of the steel strip 3 to be passed is extracted from the learning table stored in the memory 31. Further, the count value Ppi of the pulse counter 30 of the pulse generator 29 is set to zero, and counting is subsequently started. Step s5
Then, the thickness ratio α is calculated. The calculation of the sheet thickness ratio α is performed after the welding point passes through the rolling mill 9 and the first and second sheet thickness gauges 7,
8 is performed based on the output.

In step s6, the required pulse integrated value Pt
r and Ptc are calculated based on the equations (2) to (5). The required pulse integrated values Ptr and Ptc are such that the welding point is the first.
The required moving distance from the passage through the WPD 23 to the arrival at the trimmer device 11 and its control start position 37 is shown. In step s7, it is determined whether or not the count value Ppi of the pulse counter 30 has reached the required pulse integrated value Ptc. If this determination is affirmative, the process proceeds to step s8, and if negative, the process waits until the determination becomes positive. In step s8, a signal indicating that the welding point has reached the control start position 37 of the trimmer device 11 is transmitted to the trimmer control device 20. When changing the trimming width, the trimmer control device 20 reduces the rotation speed of the trimmer device 11 and the traveling speed of the steel strip 3 at this timing.

At step s9, it is determined whether or not the count value Ppi of the pulse counter 30 has reached the required pulse integrated value Ptr. If the determination is affirmative, the process proceeds to step s10, and if the determination is negative, the process waits until the determination becomes affirmative. In step s10, a signal indicating that the welding point has reached the trimmer device 11 is transmitted to the trimmer control device 20. When changing the trimming width, the trimmer control device 20 stops the trimmer device 11 and the steel strip 3 at this timing, and changes the trimming width setting to the following material setting. If the blade replacement time has come, the blade replacement is performed. If the trimming width is not changed, neither the deceleration nor the stop is performed. In step s11,
The above series of operations ends.

As described above, the required moving distance of the welding point is obtained based on the plate thickness ratio and the catenary set value, and when the actual moving distance matches the required moving distance, an arrival signal is transmitted. Processing can be performed accurately. Therefore, an appropriate control start timing can always be given to a device such as the trimmer device 11 that requires high-accuracy tracking processing regardless of the specifications of the steel strip 3.

FIG. 5 is a flow chart for explaining the operation of the learning processing circuit of the tracking device shown in FIG. In steps c1 to c4, exactly the same processes as those in steps s1 to s4 shown in FIG. 4 are performed, and a description thereof will be omitted. In Step c5, it is determined whether or not the welding point has reached the second WPD 24. If the determination is affirmative, the process proceeds to step c6. If the determination is negative, the process waits until the determination becomes affirmative. In step c6, the pulse integrated value Pct when the welding point reaches the second WPD 24 is measured. In step c7, the average value αav of the plate thickness ratio is calculated. αav is calculated by averaging the sheet thickness ratio between when the welding point reaches the second WPD 24 after passing through the first WPD 23.

In step c8, the actual moving distance Lcr from when the welding point passes through the rolling mill 9 to when it reaches the second WPD 24 is calculated based on the equation (6). Step c
In 9, after the welding point has passed through the rolling mill 9, the second WPD 2
The required moving distance Lxx required to reach No. 4 is calculated based on equation (7). In step c10, the deviation Lln between the set value of the catenary amount and the actual value is calculated based on the equation (8). In step c11, the obtained deviation Lln is within a predetermined deviation range, that is, the upper limit value Lln of the deviation.
It is determined whether the value is equal to or less than max and equal to or more than the lower limit value Llnmin of the deviation. If this determination is affirmative, the process proceeds to step c12, and if negative, the process proceeds to step c14. That is, if the judgment is affirmative, the deviation Lln is adopted, and if the judgment is negative, the deviation Lln is regarded as an abnormal value and is excluded. In step c12, the catenary learning value Lctnew is calculated based on equation (10). In step c13, the set value of the catenary amount in the learning table is updated, and the calculated catenary learning value Lctnew is stored in the corresponding area of the learning table. In step c14, the series of operations ends.

As described above, the catenary learning value is obtained based on the deviation between the set value of the catenary amount and the actual value, and the set value of the catenary amount in the learning table is updated based on the obtained catenary learning value. Therefore, even if the specifications of the steel strip 3 change, an appropriate catenary amount is always set during operation.
In addition, since the tracking accuracy is automatically adjusted during operation, high-accuracy tracking processing can be maintained.

Incidentally, such a tracking processing circuit 3
4 and the operation of the learning processing circuit 35 can be similarly applied not only to the trimmer device 11 but also to a cutting machine and a winding device.

As described above, in the present embodiment, the tracking processing of the welding point of the steel strip 3 is performed based on the moving distance of the welding point of the steel strip 3, and therefore, the detector for directly detecting the welding point is the second detector. Only two 1WPD23 and second WPD24 are required, and the number of welding point detectors to be installed can be significantly reduced as compared with the conventional case.

[0047]

As described above, according to the present invention, since the tracking processing of the singular point of the metal band is performed by the calculation, the number of singular point detecting means can be greatly reduced as compared with the related art. Therefore, the equipment cost can be significantly reduced, and the occurrence rate of problems caused by the singularity detecting means can be significantly reduced. Further, the tracking processing is performed in consideration of an increase in the plate length due to rolling, which is a factor for reducing the tracking accuracy, and an increase in the plate length due to the hanging of the metal band in the pickling tank, so that the tracking accuracy is improved.

Further, according to the present invention, since the tracking processing of the singular point of the metal band can be performed with high accuracy, it is possible to always provide appropriate control timing to various devices regardless of the size and material of the metal band. . Therefore, the product yield is improved. Further, a correction value of the plate length increase amount appropriately reflecting the operation results is obtained, and the content of the memory is updated to the obtained correction value. The appropriate increase in the plate length is always set. Therefore, highly accurate tracking processing can be maintained. In addition, the intervention of the worker is reduced, and labor can be saved.

Further, according to the present invention, since the rolling mill is provided on the entrance side of the pickling apparatus, cracks are generated on the oxide scale, and the pickling efficiency can be greatly improved. Further, since the tracking processing circuit and the learning processing circuit are provided, the tracking processing of the singular point of the metal band can be performed with high accuracy.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a simplified configuration of a continuous pickling facility according to an embodiment of the present invention and a tracking device for a singular point of a metal strip provided therein.

FIG. 2 is a cross-sectional view showing a simplified configuration of the pickling apparatus shown in FIG.

FIG. 3 is a schematic diagram showing contents of a learning table.

FIG. 4 is a flowchart for explaining an operation of a tracking processing circuit of the tracking device shown in FIG. 1;

FIG. 5 is a flowchart for explaining the operation of the learning processing circuit of the tracking device shown in FIG. 1;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 continuous pickling equipment 3 hot-rolled steel strip 4 first bridle roll 9 rolling mill 10 pickling device 11 trimmer device 13 tracking device 16 pickling tank 20 trimmer control device 23 first welding point detector 24 second welding point detection Unit 25 moving distance detector 26 arithmetic unit 29 pulse generator 30 pulse counter 31 memory 33 result collection processing circuit 34 tracking processing circuit 35 learning processing circuit 36 operation command transmitting device 37 control start position 38 cycle timer

Claims (3)

[Claims] 1. A continuous pickling equipment provided with a rolling mill on the entrance side of a pickling apparatus, and when a singular point of a traveling metal strip reaches a predetermined position, a reaching signal is transmitted to a predetermined apparatus of the continuous pickling equipment. A first singularity detecting means for detecting a singularity of a traveling metal strip, and a pickling tank; and a picking tank disposed at an entrance side of the rolling mill and arranged at intervals in a traveling direction of the metal strip. A second singularity detecting means provided on the exit side of the pickling apparatus having a supporting roll and detecting a singularity of the traveling metal strip; and a moving distance of the singularity of the metal strip provided on the entry side of the rolling mill. Moving distance detecting means for measuring the installation position of the first singularity detecting means as a starting point, and a sheet thickness ratio of the metal sheet before and after the rolling or a ratio corresponding to the sheet thickness ratio. The calculation means to be found and the amount of increase in plate length due to the hanging of the metal strip in the pickling tank The singular point of the metal band reaches a predetermined position downstream of the rolling mill in the running direction of the metal band based on the output of the moving distance detecting unit, the output of the calculating unit, and the set value of the plate length increase amount set in advance. Determine whether or not, when the singular point of the metal band reaches a predetermined position, send a reaching signal to a predetermined device of the continuous pickling equipment,
The output of the second singularity detecting means, the output of the moving distance detecting means,
And a tracking means for correcting and updating the set value of the plate length increase amount based on the output of the arithmetic means and the set value of the plate length increase amount. Tracking device for singular points of metal strip. 2. The tracking means comprises: a memory for storing a predetermined correspondence relationship between a thickness, a width, and a specific gravity of a metal strip and a set value of the increase in the length of the metal strip; A result collection processing circuit for determining a set value of the plate length increase amount corresponding to the thickness, the plate width and the specific gravity based on the correspondence stored in the memory, and collecting outputs of the moving distance detection unit and the calculation unit; After the singular point of the metal band has passed through the first singular point detecting means,
The required moving distance to reach one or more predetermined positions on the exit side of the rolling mill, including the installation position of the second singularity detection means, a ratio corresponding to the obtained thickness ratio or thickness ratio, Each obtained based on the set value of the plate length increase amount, when the measured value of the moving distance detecting means coincides with the obtained required moving distance, a signal indicating that the singular point of the metal band has reached a predetermined position. A tracking processing circuit for transmitting to a predetermined device of the continuous pickling facility; a required singular distance of the metal band from the first singularity detecting means to the second singularity detecting means; Calculating a deviation from the measured value of the moving distance detecting means when the sheet reaches the output means, adding the obtained deviation to the set value of the sheet length increasing amount to obtain a correction value of the sheet length increasing amount, Stored in the memory based on the correction value 2. A tracking device for a singular point of a metal strip in a continuous pickling facility according to claim 1, further comprising: a learning processing circuit for updating a set value of the plate length increment. 3. A pickling apparatus, comprising: a pickling tank; and a support roll disposed at intervals in a traveling direction of a traveling metal strip, and an pickling apparatus for removing an oxidized scale of the metal strip; A rolling mill for rolling the metal strip, a first singularity detecting means provided on the entry side of the rolling mill and detecting a singularity of the traveling metal strip, and a rolling mill provided on the exit side of the pickling apparatus. A second singularity detecting means for detecting a singularity of the traveling metal strip, and a moving distance of the singularity of the metal strip is provided on the entrance side of the rolling mill, and a moving distance of the first singularity detecting means is set as a starting point. Moving distance detecting means for measuring, first thickness detecting means for detecting the thickness of the metal strip before rolling, second thickness detecting means for detecting the thickness of the metal strip after rolling, first and second (2) In response to the output of the sheet thickness detecting means, a sheet thickness ratio or a sheet thickness ratio between a sheet thickness before rolling and a sheet thickness after rolling of the metal strip. Calculating means for obtaining a ratio corresponding to the following: a plate length increase due to the hanging of the metal band in the pickling tank is set in advance, and based on the output of the moving distance detecting means, the output of the calculating means and the set value of the plate length increase To determine whether or not the singular point of the metal band has reached a predetermined position on the downstream side of the rolling mill in the traveling direction of the metal band, and when the singular point of the metal band reaches the predetermined position, a reaching signal is sent to the continuous pickling equipment. To a predetermined device,
The output of the second singularity detecting means, the output of the moving distance detecting means,
A continuous pickling facility comprising: a tracking unit that corrects and updates the set value of the plate length increase amount based on the output of the arithmetic unit and the set value of the plate length increase amount.