JP2664125B2 - Tension control 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 tension control device which is installed in, for example, a process line for producing steel products and controls the tension of a strip passing through the process line.

[0002]

2. Description of the Related Art In a process line for steel or the like, the tension value of a strip passing through the line is determined by the thickness of the product, accuracy, and the like.
Because it has a large effect on the uniform surface treatment of products,
It is required to maintain a constant value even when there are various disturbances. For this reason, in the process line, a bridle device, a dancer roll mechanism, and the like are installed to perform control so as to reduce fluctuation in the tension value of the strip. FIG. 7 shows an example of a conventional tension control device. 7, 1 is a strip, 2 and 3 are bridle rolls, 4 is a dancer roll, 5 is a dancer roll drive, 6 is a dancer roll motor, 7 is a torque controller, 8 is a bridle motor, 9 is a speed controller, 10 is a dancer roll position detecting device, 10
Reference numerals a and 12a denote comparators, 11 denotes a calculating device, 12 denotes a strip tension detecting device, and 13 denotes a calculating device. Strip 1
Moves through the bridle roll 2, the dancer roll 4, and the bridle roll 3, which are speed-controlled by the speed controller 9 and the bridle motor 8. The dancer roll 4 is moved up and down by a dancer roll motor 6 and a dancer roll driving device 5 controlled by a torque control device 7.
By this movement, the strip 1 is pulled up and down. The bridle rolls 2, 3 control the tension of the strip by controlling the rotation speed of these bridle rolls. The tension value of the strip 1 between the bridle rolls 2 and 3 includes a loop length determined by a difference in rotation speed between the adjacent bridle rolls 2 and 3, a loop forced length determined by a position P of the dancer roll 4, and a Young's modulus of the strip. And is determined by The dancer roll operating position also changes according to the generated tension value, the dancer roll load torque determined by the dancer roll position P, and the generated torque of the dancer roll drive system.

Next, the operation of this conventional example will be described.
The computing device 13 compares the tension T obtained by the strip tension detecting device 12 with the set tension value T ′ by the comparator 12a, and controls the torque control device 7 and the dancer roll so as to maintain a constant strip tension value. The tension control of the torque control system including the motor 6 and the dancer roll driving device 5 is performed. The computing device 11 compares the position P obtained by the dancer roll position detecting device 10 with the position set value P ′ with a comparator 10a.
And controls the speed control system including the bridle motor 8 and the speed control device 9 so as to maintain a constant strip tension value. Then, the rotation speeds of the adjacent bridle rolls 2 and 3 are corrected, and control is performed so that the dancer roll position related to the loop length is stably returned to the position of the set value P ′.

[0004]

Since the conventional strip tension control device is configured as described above, no disturbance due to vibration such as backlash of each machine in a process line or torsional vibration of a roll is taken into consideration. Therefore, there is a problem that the vibration causes a change in the tension of the strip, thereby deteriorating the quality of the steel product.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and can reduce the fluctuation of the tension of the strip due to the vibration and improve the stability of the tension control device to improve the quality of the steel product. It is an object of the present invention to obtain a tension control device that can perform the control.

[0006]

According to the first aspect of the present invention, there is provided a tension control device including a dancer roll 4 between a bridle roll 2 and a bridle roll 3, which is generated when a strip passes. Detecting means (vibration detecting device 14) for detecting vibrations such as machine rattling; comparing the detected amount detected by the detecting means with a reference value; outputting a correction amount only when the detected amount is larger than the reference value; And a control means (speed control device 9) for controlling the bridle roll by adjusting the torque by adding the correction amount to the current torque amount of the bridle roll. The tension control device according to the second invention, in addition to the configuration of the first invention, collects numerical data of a vibration value corresponding to the correction amount, and designates a most appropriate correction amount for the current vibration value. Learning means (learning device 20), and the correction amount from the correction means and the detection amount from the detection means are converted into numerical data and output to the learning means, and a predetermined correction amount is instructed by the learning means. And a data conversion means (data converter 19) for outputting the data to the control means.

The tension control device according to the third aspect of the present invention is a strip tension control device having a dancer roll 4 between a bridle roll 2 and a bridle roll 3, wherein a machine rattle or the like is generated when a strip passes. Detecting means (vibration detecting device 14) for detecting the vibration of the sensor and a correcting means (correcting means for comparing the detected amount detected by the detecting means with a reference value and outputting a correction amount only when the detected amount is larger than the reference value) An arithmetic unit 15) and control means (speed control unit 9) for controlling the dancer roll by adding the correction amount to the current movement position amount of the dancer roll are provided. The tension control device according to the fourth aspect of the present invention, in addition to the configuration of the third aspect, collects numerical data of a vibration value with respect to the correction amount and instructs the most appropriate correction amount with respect to the current vibration value. The learning means (learning device 20) converts the correction amount from the correction means and the detection amount from the detection means into numerical data and outputs the numerical data to the learning means. Data conversion means (data converter 19) for outputting to the control means.

The tension control device according to the fifth aspect of the present invention is a tension control device having a dancer roll 4 between the bridle roll 2 and the bridle roll 3, wherein the backlash generated when the strip passes is reduced. Detecting means (vibration detecting device 14) for detecting vibration; anti-phase calculating means (opposite-phase vibration calculating device 17) for calculating a signal of the opposite phase to the detection signal detected by the detecting means; A vibration generating means (vibration generating device 18) for generating phase vibration. The tension control device according to the sixth aspect of the present invention includes the tension control device according to the fifth aspect.
In addition to the configuration of the present invention, a reverse-phase calculating means (a negative-phase vibration calculating device 17) for calculating a signal of a reverse phase to the detection signal detected by the detecting means, and a vibration generation for generating a reverse-phase vibration based on the calculated value Means (vibration generating device 18) and numerical data obtained by calculating a vibration value from the above-mentioned antiphase calculating means,
A learning means (learning device 20) for instructing the most appropriate calculation value for the vibration value; a calculation value from the reverse phase calculation means being converted into numerical data and output to the learning means; Data conversion means (data converter 19) for converting numerical data according to the instruction into a calculation value and outputting the converted value to the above-described negative phase calculation means.

[0009]

The tension control device according to the first aspect of the present invention uses a vibration detecting device (vibration detecting device) to detect vibration caused by mechanical play or torsion of the roll generated when the strip 1 passes through the bridle roll 2 and the bridle roll 3. Detect in 14). Next, the correction means (correction calculation device 15) compares the detection amount detected by the detection means with a reference value, and outputs the correction amount only when the detection amount is larger than the reference value. Then, the control means (speed control device 9) adds the correction amount to the current torque amount of the bridle roll to adjust the torque, thereby controlling the bridle roll and controlling the tension of the strip. In the tension control device according to the second aspect of the invention, the learning means (learning device 20) collects numerical data of the vibration value corresponding to the correction amount for correcting the torque of the bridle roll, and obtains the most appropriate vibration value for the current vibration value. Specify the correction amount. Data conversion means (data converter 1
9) Converts the correction amount and the detection amount from the detection unit into numerical data and outputs the numerical data to the learning unit, and outputs a predetermined correction amount according to an instruction of the learning unit to the control unit. Then, the tension of the strip is controlled.

[0010] In the tension control device according to the third aspect of the present invention, the strip 1 includes the bridle roll 2 and the bridle roll 3.
Detection means (vibration detection device 14) detects vibrations caused by mechanical backlash and roll torsional vibrations generated when passing through
To detect. Next, the correction amount (adjacent device correction device 16) compares the detection amount detected by the detection unit with a reference value, and outputs the correction amount only when the detection amount is larger than the reference value. Then, the control means (torque control device 7) adds the correction amount to the torque amount at the current movement position of the dancer roll, thereby controlling the torque of the dancer roll and controlling the tension of the strip. In the tension control device according to the fourth aspect of the invention, the learning means (learning device 20) collects numerical data of the vibration value corresponding to the correction amount for correcting the position of the dancer roll, and obtains the most appropriate value for the current vibration value. Specify the correction amount. The data conversion means (data converter 19) converts the correction amount from the correction means and the detection amount from the detection means into numerical data and outputs the numerical data to the learning means, and a predetermined correction amount according to the instruction of the learning means. Is output to the control means. Then, the tension of the strip is controlled.

[0011] In the tension control device according to the fifth aspect of the present invention, the strip 1 includes the bridle roll 2 and the bridle roll 3.
(Vibration detecting device 14) that is generated when the vehicle passes through and vibration caused by mechanical backlash or roll torsion. Next, a signal having a phase opposite to that of the detection signal detected by the detecting device is calculated by a negative-phase vibration calculating means (a negative-phase vibration calculating device 17). Next, the vibration generating means (vibration generating device 18) generates reverse-phase vibration based on the calculated value to eliminate the vibration and reduce the influence of the vibration on the tension of the strip. In the tension control device according to the sixth aspect of the invention, the vibration generated when the strip passes through the bridle roll is detected by the detection means (vibration detection device 4). Next, a calculation value corresponding to the detected amount is calculated by the negative-phase calculating means (the negative-phase vibration calculating device 17), and based on the calculated value, the vibration generating means generates a negative-phase vibration to eliminate the vibration. On the other hand, the learning means (learning device 20) collects, via the data conversion means (data converter 19), numerical data based on a calculation value for the vibration value from the above-described negative phase calculation means,
The most appropriate calculation value for the vibration value is instructed to the above-mentioned reverse phase calculation means. And the influence of the vibration on the strip is reduced.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Embodiment 1 FIG. FIG. 2 is a configuration diagram of the tension control device according to the first embodiment of the present invention. In FIG. 1, 1 is a strip, 2 and 3 are bridle rolls, 4 is a dancer roll, 5 is a dancer roll drive device, 6 is a dancer roll motor, 7 is a torque control device, 8 is a bridle motor, 9 is a speed control device, 10 is a dancer roll position detecting device, 10a is a comparator, 11 is a calculating device, 12 is a strip tension detecting device, 13 is a calculating device as control means, 13a is a comparator, 14 is a vibration detecting device as detecting means, 15 Denotes a correction operation device as correction means. The vibration detection device 14 is a bridle roll 2
Vibration is detected from the vicinity and converted into a voltage, and the voltage is output to the correction operation device 15. Vibrations generated from the vicinity of the bridle roll 2 include friction fluctuations when the strip 1 passes, mechanical play, and torsional vibration of the bridle roll. The correction calculating device 15 receives the voltage due to the vibration from the vibration detecting device 14 and compares it with a set value (reference value). When the input voltage is smaller than the set value, the correction amount is set to zero or the bridle rolls 2, 3
Increase the control gain of. If the correction amount α (actually negative) is output from the correction operation device 15, the speed control device 9 controls the bridle motor based on the added control amount in addition to the control amount β from the operation device 11. Then, the rotation speed of the bridle motor 2 is reduced to reduce vibration.

Next, the operation of the tension control device according to the first embodiment of the present invention will be described. Strip 1 passes through bridle roll 2, dancer roll 4, and bridle roll 3. At this time, the tension T of the strip 1 is
The tension is detected by the tension detecting device 12. The comparator 13a compares the preset strip tension set value T 'with the detection value from the strip tension detector 12, and outputs the comparison value. The arithmetic unit 13 calculates the position of the dancer roll from the comparison value. Is calculated, converted into a position control amount based on the calculated value, and output. The torque control device 7 is a computing device 1
Based on the control amount of 3, the position of the dancer roll 4 is controlled via the dancer roll motor 6 and the dancer roll driving device 5, and the strip 1 is pulled. As described above, the dancer roll drive control system controls the vertical position of the dancer roll 4 and controls the tension of the strip 1 so that the tension control value T 'of the strip is always kept constant. On the other hand, the vertical position P of the dancer roll 4 is converted into a voltage value by the dancer roll position detecting device 10. The comparator 10a compares a preset bridle roll tension set value P ′ with a position detection value (P) from the dancer roll position detection device 10 and outputs the comparison value. The computing device 11 computes a voltage value β suitable for input to the speed control device 9 from the comparison value, and outputs a control amount β proportional to the computed value.

On the other hand, the vibration detected by the vibration detecting device 14 in the vicinity of the bridle roll 2 is converted into a voltage and input to the correction calculating device 15. The correction arithmetic unit 15 sets the input voltage to a preset value (reference value).
When the input voltage is larger than the set value, the output value (correction amount) is output. When the input voltage is smaller than the set value, the output value is set to zero. That is, when the vibration is somewhat large, the correction is made, and when the vibration is not so large, no correction is made. The speed control device 9 corrects the control amount β from the calculation device 11 and corrects the control amount β from the correction calculation device 15 when there is a correction. The amount α is added, and when there is no correction, the rotation speed of the bridle roll 2 is controlled via the bridle motor 8 with only the control amount β to control the tension of the strip 1. As described above, the tension control device according to the first embodiment can control the tension of the strip in consideration of disturbance due to vibration.

Embodiment 2 FIG. FIG. 2 is a configuration diagram of a tension control device according to Embodiment 2 of the present invention. In FIG. 2, 19 is a data converter as data conversion means, and 20 is a learning device as learning means. Other configurations are the same as those of the first embodiment. The data converter 19 converts the control amount of the speed control device 9 into numerical data and outputs it to the learning device. Further, it converts the numerical data instructed from the learning device 20 into a control amount (voltage value) and outputs it to the speed control device 9. Then, the speed control device 9 controls the rotation of the bridle roll based on the output value. The learning means 20 stores the control value data from the data converter 19 and the control value data of the entire steel process line. When disturbance due to vibration is considered in the entire steel process line, the most appropriate control value data is calculated, and the calculated data is output to the data converter 19.

Embodiment 3 FIG. FIG. 3 is a configuration diagram of a tension control device according to Embodiment 3 of the present invention. In FIG. 3, reference numeral 16 denotes an adjacent device correction device. In the apparatus according to the first embodiment, the vibration of the bridle roll is detected by the vibration detection device 14 and the correction operation device 15 and the control is performed so as to correct the control gain of the bridle roll itself. As shown in FIG. 3, an adjacent machine correction arithmetic unit 16 for converting the vibration of the bridle roll into a torque correction amount of the dancer roll 4 at the subsequent stage is provided. By doing so, even when the bridle roll vibration cannot be corrected by the bridle roll itself, stable tension control can be performed by performing correction with the adjacent device, and the quality of the product can be improved. . Further, in the above case, the case where the control gain of the dancer roll is corrected from the vibration of the bridle roll has been described.

Embodiment 4 FIG. FIG. 4 is a configuration diagram of the tension control device according to the embodiment of the present invention. The data converter 19 converts the control amount of the torque control device 7 into numerical data and outputs it to the learning device. Further, it converts the numerical data instructed by the learning device 20 into a control amount (voltage value) and outputs it to the torque control device 7. Then, it causes the torque control device 7 to control the position of the dancer roll based on the output value. Learning means 20
Stores the control value data from the data converter 19 and the control value data of the entire steel process line. When disturbance due to vibration is considered in the entire steel process line, the most appropriate control value data is calculated, and the calculated data is output to the data converter 19.

Embodiment 5 FIG. FIG. 5 is a configuration diagram of a tension control device according to Embodiment 5 of the present invention. In FIG. 5, reference numeral 17 denotes an anti-phase vibration calculating device, and reference numeral 18 denotes a vibration generating device. The negative-phase vibration calculating device 17 calculates the negative-phase voltage fluctuation based on the voltage fluctuation due to the vibration from the vibration detecting device 14. That is, if the voltage fluctuation due to the vibration is a peak value (detection value × detector magnification) a (volt) at time t1, −a (volt) is calculated. Then, the negative-phase generator 18 generates a negative voltage waveform from the calculated value, and
Output near. The vibration output from the reverse phase generator 18 cancels the positive vibration. Of course, since there is a time lag between the vibration detected by the vibration detecting device and the anti-phase vibration generated by the vibration generating device 18, the anti-phase vibration calculating device 17 is caused to calculate a high speed. As described above, in the devices of the first and second embodiments, the control gain is corrected by the vibration detecting device. However, in the device of the fifth embodiment, as shown in FIG. A negative-phase vibration calculating device 17 for calculating the negative-phase vibration of the detected vibration and a negative-phase generating device 18 for realizing the calculation result are provided to positively suppress the vibration of the vibrating device.

Embodiment 6 FIG. FIG. 6 is a configuration diagram of a tension control device according to Embodiment 6 of the present invention. In the device of the sixth embodiment, the functions of the data converter 19 and the learning device 20 are the same as those of the devices of the second and fourth embodiments, but handle different data. That is, the data converter 19 exchanges data with the anti-phase vibration calculating device 17 to generate anti-phase vibration. In the above-described first to fourth embodiments, the bridle roll and the dancer roll of the process line in steel are described. However, a similar device in a looper of the process line or a papermaking line may be used.

[0020]

According to the first aspect of the present invention, the vibration of the backlash of the machine when the strip passes through the dancer roll is detected by the detecting means, and when the detected amount is larger than the reference value, the correction is made by the correcting means. The amount is output, and the control unit adjusts the amount of torque of the bridle roll based on the correction amount to control the tension on the strip, so that stable tension control of the strip can be realized and high quality can be achieved. There is an effect that the product can be manufactured. According to the second aspect, when the correction amount is added to the control means, the learning means
The vibration value corresponding to the correction amount is converted into numerical data by the data conversion means and collected, and the most appropriate correction amount for the current vibration value is instructed to the control means. As compared with the case of the above, it is possible to realize more stable tension control on the strip and to produce a high quality product.

According to the third aspect of the invention, the vibration of the backlash or the like of the machine when the strip passes through the bridle roll is detected by the detecting means, and when the detected amount is larger than the reference value, the correction amount is determined by the correcting means. Output, and the control means adjusts the position of the dancer roll device based on this correction amount to control the tension on the strip, so that stable tension control of the strip can be realized and a product of good quality can be realized. There is an effect that can be manufactured. According to the fourth aspect, when the correction amount is added to the control unit, the learning unit converts the vibration value corresponding to the correction amount into numerical data by the data conversion unit and collects the vibration value. On the other hand, since the most appropriate correction amount is instructed to the control means, it is possible to realize more stable tension control on the strip and produce a high quality product than the first invention. .

According to the fifth aspect of the invention, the vibration of the backlash or the like of the machine when the strip passes through the dancer roll is detected by the detecting means, and this detector is calculated by the reverse-phase vibration calculating means.
Since the vibration generating means is configured to generate the opposite-phase vibration based on the calculated value, the tension of the strip can be controlled stably, and there is an effect that a high quality product can be manufactured. According to the sixth aspect, in order to set the operation value of the negative-phase vibration calculating means to an appropriate value, a learning means and a data converting means are provided in addition to the detecting means and the negative-phase vibration calculating means. With this configuration, the tension of the strip can be controlled more stably than that of the fifth aspect, and there is an effect that a high quality product can be manufactured.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a tension control device according to a first embodiment of the first invention.

FIG. 2 is a configuration diagram of a tension control device according to a second embodiment of the second invention.

FIG. 3 is a configuration diagram of a tension control device according to a third embodiment of the third invention.

FIG. 4 is a configuration diagram of a tension control device according to a fourth embodiment of the fourth invention.

FIG. 5 is a configuration diagram of a tension control device according to a fifth embodiment of the fifth invention.

FIG. 6 is a configuration diagram of a tension control device according to a sixth embodiment of the sixth invention.

FIG. 7 is a configuration diagram of a conventional tension control device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Strip 2, 3 Bridle roll 4 Dancer roll 5 Dancer roll drive 6 Dancer roll motor 7 Torque control device 8 Bridle motor 9 Speed control device 10 Dancer roll position detecting device 11 Computing device 12 Strip tension detecting device 13 Computing device 14 Vibration detection Apparatus 15 Correction operation device 16 Adjacent machine correction device 17 Negative phase vibration operation device 18 Vibration generator 19 Data converter 20 Learning means

Claims (6)

(57) [Claims] 1. A dancer roll is provided between a bridle roll and another bridle roll adjacent to the bridle roll, and the dancer roll is arranged such that a tension value of a strip passing through both bridle rolls maintains a set tension value. To adjust the tension of the strip by pulling the strip in a direction different from the passing direction of the strip, so that the deviation between the moving position from the reference position of the dancer roll and the set position becomes zero, In a tension control device for adjusting the strip tension by correcting the rotation speed of the bridle roll, a detection means for detecting vibration of a mechanical backlash generated when the strip passes, and a detection amount detected by the detection means Is compared with the reference value,
A correction unit that outputs a correction amount only when the detected amount is larger than a reference value, and a control unit that controls the bridle roll by adding the correction amount to the current control amount of the bridle roll. Tension control device. 2. A dancer roll is provided between a bridle roll and another bridle roll adjacent to the bridle roll, and the dancer roll is arranged so that a tension value of a strip passing through both bridle rolls maintains a set tension value. To adjust the tension of the strip by pulling the strip in a direction different from the passing direction of the strip, so that the deviation between the moving position from the reference position of the dancer roll and the set position becomes zero, In a tension control device for adjusting the strip tension by correcting the rotation speed of the bridle roll, a detection means for detecting vibration of a mechanical backlash generated when the strip passes, and a detection amount detected by the detection means Is compared with the reference value,
Correction means for outputting a correction amount only when the detected amount is larger than a reference value; control means for controlling the bridle roll by adding the correction amount to the current control amount of the bridle roll; and vibration for the correction amount. Learning means for collecting the numerical data of the value, and instructing the most appropriate correction amount for the current vibration value, and converting the correction amount from the correction means and the detection amount from the detection means into numerical data, A tension control device comprising: a data conversion unit that outputs a predetermined correction amount to the control unit in response to an instruction from the learning unit and outputs the correction amount to the learning unit. 3. A dancer roll is provided between a bridle roll and another bridle roll adjacent to the bridle roll, and the dancer roll is arranged so that a tension value of a strip passing through both bridle rolls maintains a set tension value. To adjust the tension of the strip by pulling the strip in a direction different from the passing direction of the strip, so that the deviation between the moving position from the reference position of the dancer roll and the set position becomes zero, In a tension control device for adjusting the strip tension by correcting the rotation speed of the bridle roll, a detection means for detecting vibration of a mechanical backlash generated when the strip passes, and a detection amount detected by the detection means Is compared with the reference value,
A correction unit that outputs a correction amount only when the detected amount is greater than a reference value; and a control unit that controls the torque of the dancer roll by adding the correction amount to the torque amount of the current movement position of the dancer roll. A tension control device, characterized in that: 4. A dancer roll is provided between a bridle roll and another bridle roll adjacent to the bridle roll, and the dancer roll is arranged such that a tension value of a strip passing through both bridle rolls maintains a set tension value. To adjust the tension of the strip by pulling the strip in a direction different from the passing direction of the strip, so that the deviation between the moving position from the reference position of the dancer roll and the set position becomes zero, In a tension control device for adjusting the strip tension by correcting the rotation speed of the bridle roll, a detection means for detecting vibration of a mechanical backlash generated when the strip passes, and a detection amount detected by the detection means Is compared with the reference value,
Correction means for outputting a correction amount only when the detected amount is larger than a reference value, and control means for controlling the torque of the dancer roll by adding the correction amount to the torque amount of the current movement position of the dancer roll; A learning unit that collects numerical data of a vibration value with respect to the correction amount and instructs the most appropriate correction amount with respect to a current vibration value; And a data conversion means for outputting a predetermined correction amount to the control means in accordance with an instruction of the learning means, and a data conversion means. Tension control device. 5. A dancer roll is provided between a bridle roll and another bridle roll adjacent to the bridle roll, and the dancer roll is arranged such that a tension value of a strip passing through both bridle rolls maintains a set tension value. To adjust the tension of the strip by pulling the strip in a direction different from the passing direction of the strip, so that the deviation between the moving position from the reference position of the dancer roll and the set position becomes zero, In a tension control device for adjusting the rotation speed of the bridle roll to adjust the tension of the strip, a detection means for detecting vibration of a mechanical backlash generated when the strip passes, and a detection signal detected by the detection means -Phase vibration calculating means for calculating a signal of the opposite phase of the above, and vibration generation for generating a reverse-phase vibration based on the calculated value And a tension control device. 6. A dancer roll is provided between a bridle roll and another bridle roll adjacent to the bridle roll, and the dancer roll is arranged such that a tension value of a strip passing through both bridle rolls maintains a set tension value. To adjust the tension of the strip by pulling the strip in a direction different from the passing direction of the strip, so that the deviation between the moving position from the reference position of the dancer roll and the set position becomes zero, In a tension control device for adjusting the rotation speed of the bridle roll to adjust the tension of the strip, a detection means for detecting vibration of a mechanical backlash generated when the strip passes, and a detection signal detected by the detection means -Phase vibration calculating means for calculating a signal of the opposite phase of the above, and vibration generation for generating a reverse-phase vibration based on the calculated value Means, learning means for collecting numerical data based on the calculated value for the vibration value from the reverse phase calculating means, and indicating the most appropriate correction amount for the vibration value, and calculating the calculated value from the negative phase calculating means as a numerical value. Data converting means for converting the data into data and outputting the data to the learning means, and converting the numerical data instructed by the learning means into a calculated value and outputting the calculated value to the negative phase calculating means. .