JP2749464B2 - 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,
In particular, suitable for use in maintaining a constant strip tension of the processing section in a process line such as rolling,
The present invention relates to an apparatus for passing a strip between a transport roll and a movable transport roll, and controlling the tension of the strip by moving the movable transport roll.

[0002]

2. Description of the Related Art Generally, in a process line such as a rolling process, in order to ensure stable quality of a strip, a continuous operation is performed while applying a constant speed and tension to the strip at a central portion (central section) of the line. It is necessary.

On the other hand, in the entry section or the exit section of the process line, a finite length strip is unwound or wound in a coil unit. As a result, along with switching in coil connection and winding,
A temporary deceleration or stoppage of the strip occurs at the entry or exit section.

In order to cope with such a temporary deceleration or stoppage, a looper is provided in the process line to ensure continuous operation in the central section.

[0005] However, when the operation of the looper occurs as the deceleration, stop, or acceleration of the entrance section or the exit section occurs, the strip of the central section, which is continuously operated, is moved from the entrance section or the exit section. May fluctuate. Such propagation of the tension fluctuation not only adversely affects the quality assurance in the central section, but also has a possibility that the strip may meander due to the tension fluctuation, and may lead to plate breakage.

On the other hand, conventionally, there has been proposed a tension control device in which a dancer roll is installed in the central section so as to suppress the propagation of the tension fluctuation as described above and apply a constant tension to the strip. (See, for example, JP-A-1-30
834 9 JP, etc.).

[0007] A tension control device having a dancer roll as described above has a configuration as shown in FIG. FIG.
In, the strip 1 passes from the transport roll 2 to another transport roll 2 via the dancer roll 3. In this tension control device, the dancer roll 3 is connected to a winding drum 4 and a counterweight 6 via a wire 5, and the winding drum 4 is connected to an electric motor 8 via a speed reducer 7.
It is connected to. The electric motor 8 rotates the winding drum 4 via the speed reducer 7 to move the dancer roll 3 up and down. The torque of the electric motor is controlled to control the tension of the strip 1.

[0008]

However, in the tension control device having the above-mentioned conventional dancer roll, when a sharp tension fluctuation intrudes into the strip of the central section from the outside, for the following reasons, the tension is not increased. There is a problem that the control of the tension is completely powerless and the tension control cannot be performed with high responsiveness and high accuracy to the fluctuation of the tension.

That is, the dancer roll has a large mechanical resistance during its operation. Although not shown in FIG. 4, the actual dancer roll is provided with a guide for determining its operation direction.
And the wire 5 have a mechanical resistance.

The reason is that the dancer roll has a large moment of inertia during operation. For example, in FIG. 4, the motor 8 and the winding drum 4 via the speed reducer 7 affect the moment of inertia of the dancer roll 3 when ascending and descending.

[0011] In addition, mechanical tension (backlash) of the speed reducer causes an operation delay and a new tension fluctuation accompanying the operation of the dancer roll.

Further, the tension control device having the above-mentioned conventional dancer roll has a small mechanical loss due to a large mechanical loss, a backlash in the mechanical system, and a large resistance of the machine. There is also a problem that tension control cannot be performed with high accuracy with respect to such tension fluctuations.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and controls the strip tension with high responsiveness and also with high accuracy even to a sudden change in tension from the outside. A first object is to provide a tension control device that can perform the control.

Another object of the present invention is to provide a tension control device capable of controlling the strip tension with high responsiveness and high accuracy using a small-capacity electric motor even with a small tension fluctuation. 2 issues.

According to a first aspect of the present invention, there is provided an apparatus for controlling the tension of a strip by passing a strip between a transport roll and a movable transport roll, and moving the movable transport roll, wherein the apparatus pivots around a support shaft. And an arm provided with the movable transfer roll at the end opposite to the support shaft, and directly connected to the support shaft, and generating a torque around the support shaft on the arm to apply tension to the strip. An electric motor, an angle detector for detecting the angle of the turning movement of the arm, a tension meter for detecting the tension of the strip, and correcting the torque generated in the arm by the detected angle and the detected tension. A tension control means for controlling the tension of the strip to a target tension ;
Controlling the transport speed to the line target speed and detecting the
When the change in angle is large, keep the angle of the arm constant
To correct the transport speed of the strip to maintain
With the provision of the trip speed control means , the first
It is intended to solve the problem.

The structure of the first invention is based on the original application claiming domestic priority (Japanese Patent Application No. 3-16 filed on June 5, 1991).
0941).

[0017] The second invention of the present patent application is to Tsuban strip between the conveying rolls and the movable feed roll by the movement of the movable conveyor roll, an apparatus for controlling the tension of the strip, turning around the support shaft Moving, and the movable transport roll is provided at the end opposite to the support shaft, an arm for applying tension to the strip by torque around the support shaft, and directly connected to the support shaft, An electric motor for generating a torque about the support shaft in the arm; an electric motor torque control means for controlling the torque of the electric motor to control a torque generated by the electric motor on the arm; A counter weight provided on the support shaft such that a position in a perpendicular direction is adjustable, and a counterweight for generating a torque about the support shaft on the arm; Counterweight position adjusting means for adjusting the position of the weight in the perpendicular direction to control the torque generated in the arm, an angle detector for detecting the angle of the turning movement of the arm, and A tension meter for detecting the tension, and a torque to be generated on the arm by the control of the motor torque control means and the counter weight position adjustment means based on the detection angle and the detected tension such that the tension of the strip becomes the target tension. Tension control means for controlling the
Controlling the transport speed to the line target speed and detecting the
When the change in angle is large, keep the angle of the arm constant
To correct the transport speed of the strip to maintain
And the trip speed control means .
It is intended to solve the problem.

The structure of the second invention is basically based on a publication based on the exceptional claim of loss of novelty (Materials and Processes, Vol.
l. 4 (1991) No. 2, p. 598).

[0019]

In the tension control device according to the first aspect of the present invention, the arm which pivots about the support shaft is provided with a movable transfer roll at the end opposite to the support shaft. In addition, an electric motor is directly connected to the support shaft, and a torque is generated around the support shaft in the arm to apply tension to the strip. Further, the angle of the turning movement of the arm is detected by an angle detector, the tension of the strip is detected by a tensiometer, and the torque generated on the arm is corrected by the detected angle and the detected tension, so that the tension of the strip is targeted. Control to tension.

As described above, since the torque of the arm is controlled by the electric motor and the tension is controlled by rotating the movable transfer roll through the arm, unlike the conventional dancer roll, a winding drum or a wire is not required. Therefore, the mechanical resistance becomes extremely small. Further, since these winding drums and the like are not required, the moment of inertia of the mechanical shaft system is reduced. Further, since the electric motor is directly connected to the support shaft, there is no operation delay or new tension fluctuation due to backlash as when a speed reducer is provided. Furthermore, before
When the strip transfer speed is controlled to the line target speed
In both cases, when the change in the detection angle is large, the arm
The strip speed so that the angle of the strip remains constant.
So that when the angle change is large,
Can be controlled quickly. Corrected strip speed
Only when the angle change is large.
There is no adverse effect on speed control accuracy.

[0021] Therefore, it is possible to control the tension of the strip with high responsiveness and with high accuracy even when the tension of the strip suddenly enters the central section or the like from the outside. For this reason, extremely effective tension control that cannot be obtained with a conventional dancer roll can be performed.

In the tension control device of the second invention,
An arm that pivots about a support shaft is provided with a movable transport roll at the end opposite to the support shaft, and a torque is applied to the arm about the support shaft to control the tension of the strip.

The arm torque is generated as follows. That is, an electric motor is directly connected to the support shaft, and the electric motor causes the arm to generate torque around the support shaft. Further, a counter weight whose position in a direction perpendicular to the support shaft is adjustable is provided on the support shaft, and the arm generates torque around the support shaft by the counter weight. The torque generated in the arm can be controlled by controlling the motor torque and adjusting the position of the counterweight.

Further, the angle of the pivoting movement of the arm is detected by an angle detector, and the tension of the strip is detected by a tension meter.
The output of the motor and the position of the counterweight are controlled based on the detected angle and the detected tension to control the torque generated in the arm, and the tension of the strip is controlled to the target tension.

Therefore, according to the second aspect, it is possible to use both the torque control by the electric motor and the torque control by the position control of the counter weight.

Therefore, the strip tension can be controlled with good responsiveness and with high accuracy. Therefore, extremely effective tension control that cannot be obtained with a conventional dancer roll can be performed, for example, a minute fluctuation in the tension of the strip can be eliminated with high accuracy.

Further, since the torque control by the position control of the counterweight is used together with the torque control by the electric motor, the torque required for the electric motor can be suppressed low.

For example, the arm torque to be applied fixedly to some extent according to the target tension may be obtained by adjusting the position of the counterweight, and the arm torque having a rapid rise according to the tension variation may be obtained by controlling the torque of the electric motor.
Therefore, since the electric motor only needs to bear the torque corresponding to the tension fluctuation, the electric motor has a small capacity.

Therefore, the motor and its driving device can be inexpensive, which is economically advantageous. or,
Not only that, as the initial setting of the torque that supplements the motor torque, it is possible to realize rational tension control in which the torque is controlled by the position control of the counterweight and dynamic torque control is performed by the motor, and high precision is achieved. Tension control becomes possible.

[0030]

Embodiments of the present invention will be described below in detail with reference to the drawings.

The first embodiment of the present invention is a tension control device having a configuration as shown in FIG.

As shown in FIG. 1, this tension control device
An apparatus for controlling the tension of the strip 1 by passing the strip 1 between the transport roll 2 and the movable transport roll 9 and moving the movable transport roll 9 (vertical movement by pivotal movement about the axis 13), Mainly movable transfer roll 9, arm 10, support shaft 13, arm driving motor 20, arm angle detector 21, tension detector 12, tension controller 22, bridle roll 11, bridle roll driving motor 2
3. It has a strip speed controller 24.

The arm 10 is supported by a support shaft 13 and pivots about the shaft 13.
Is provided with the movable transfer roll 9 at the end opposite to the shaft 13. The support shaft 13 is supported by a bearing 13A. The movable transport roll 9 has arms 10 at both ends.
It is supported by.

The arm driving motor 20 is connected on the same axis as the support shaft 13 to generate a torque around the support shaft 13 on the arm 10 to apply tension to the strip 1. belongs to.

The arm angle detector 21 is provided for detecting the rotation angle of the pivotal movement of the arm 10 or the motor 20 for driving the arm.
, And the detected angle θ is input to the tension control unit 22 and the strip speed control unit 24.

The tension detector 12 is connected to the strip 1
And is provided immediately adjacent to the transport roll 2.

The tension control unit 22 includes the tension detector 1
2 is fed back to a target tension command Tr to be applied to the strip 1 to obtain a torque control command T1, whereby the torque of the electric motor 20 is controlled to change the tension of the strip 1 to the target tension Tr. Is controlled.

More specifically, the tension controller 22 sets the target tension T
The detected tension T is fed back to r and a comparison operation is performed.
The movable transport roll 9 is controlled by a tension controller 30 that outputs a torque control command T1 and a detection angle θ of the angle detector 21.
And a self-weight compensation calculator 33 for compensating for the inertia moment of the own weight of the arm 10, and for compensating (shaft torque compensation) that the relationship between the strip tension and the shaft torque of the electric motor 20 changes depending on the angle of the arm 10. And a tension angle compensation calculator 34.

The torque control command T1 is compensated by the outputs of the calculators 33 and 34, and the compensation torque command T1
It becomes 1 'and is inputted to the current controller 31.

The power supply line of the motor 20 is provided with a current detector 25 for detecting a current flowing through the power supply line and feeding it back to the compensation torque command T1 '. The feedback compensation torque command value T1 ', that is, the current command, is input to the current controller 31.

The current controller 31 inputs a command for controlling the input current (torque) of the motor 20 to the motor driver 32 according to the input current command.

The self-weight compensation performed by the self-weight compensation calculator 33 is, for example, as follows.

That is, the weight of the movable transfer roll 9, the arm 10, etc. is W, the distance between the center of gravity of the movable roll 9 and the fulcrum is Lo, and the angle of deviation of the arm 10 from the horizontal (the angle is 0 °) is θ. At this time, the torque compensation amount Tqs for its own weight is given by the following equation (1).

Tqs = W · Lo · cos θ (1)

This torque compensation amount Tqs is used as the tension command Tl.
To compensate for the torque of its own weight.

The shaft torque compensation performed by the tension angle compensation calculator 34 is, for example, as follows.

That is, assuming that the strip tension is To and the distance between the arm 10 and the support shaft 13 is Lr, the shaft torque compensation Tqt for compensating the shaft torque according to the angle θ is expressed by the following equation (Tqt). Given in 2).

Tqt = 2To · Lr · cosθ (2)

The shaft torque is compensated by adding the shaft torque compensation Tqt to the tension command.

The strip speed control unit 24 controls the transport speed of the strip 1 so as to set the strip transport speed to the target line speed Vr and to control the angle θ of the arm 10 to the target angle Ar. is there.

That is, the speed control unit 24 sets the target angle Ar
The detection angle and angles controller 40 you outputs a speed correction instruction for comparing the θ to correct the angle of the arm 10, the speed correction blocked the transient small angular variation of the velocity correction instruction The speed of the bridle roll drive motor 23 and, consequently, the rotation speed of the drive conveyance roll 11 are controlled by a dead band (dead zone) generator 41 for inputting a command to the speed controller 42 and the corrected speed correction command. And a speed controller 42 for keeping the angle of the arm constant through the transport speed of the strip 1.

[0052] Incidentally, a dead band generator 41, if the speed correction signal for angle correction including transient small angular variation, since the harmful if it is inputted as the speed correction signal, said fine angular The change is removed.

Next, the operation of the first embodiment will be described.

In the tension control device shown in FIG. 1, the strip 1 is wound around a bridle roll 11, and is transported by a transport roll 2, a movable transport roll 9, and another transport roll 2.
After passing through the plate, it is sent to the downstream. In this case, the tension T of the strip 1 is detected by the tension detector 12 and the angle θ of the arm 10 provided with the movable transport roll 9 with respect to the horizontal is detected by the angle detector 21. The detected tension T and the detected angle θ are input to the tension controller 22, and a target tension Tr is set in the controller 22. In the control unit 22, the detected tension T is fed back to the target tension Tr to obtain a torque control command T1.

On the other hand, the detection angle θ is determined by the
3 and input to the tension angle compensation calculator 34. The calculators 33 and 34 calculate the torque compensation amount Tqs corresponding to the own weight and the shaft torque compensation amount Tqt of the tension by the equations (1) and (2). . These compensations are added to the tension command T1.
The tension command T1 is compensated and becomes a compensation torque command T1 '.

The compensation torque command T1 'is input to the current controller 31 as a torque command value, that is, a current command value. The current controller 31 controls the electric motor driver 32 according to the torque command T1 ', thereby controlling the torque of the electric motor 20 for driving the arm and, consequently, the tension of the strip 1. In this case, the motor current detected by the current detector 25 is fed back to the compensation torque command T1 'and input to the current controller 31. The current controller 31
Controls the current supplied from the motor driver 32 to the arm driving motor 20 in accordance with the torque command T1 ', and controls the motor current so that the torque of the motor 20 becomes the command value Tl'.

On the other hand, the deviation of the angle θ of the arm 10 is as follows.
The speed controller 40 outputs a speed correction command for the line speed Vr in order to correct the angle in comparison with the predetermined target angle Ar. In this case, to prevent the failure to remove the angular variation of the transient micro caused by deadband generator 41.

The speed correction signal after the dead band is added to the target line speed Vr and input to the speed controller 42 as a speed command. The speed control unit 42 controls the bridle roll drive motor 23 according to the input speed command to control the strip conveyance speed to the target speed Vr,
The angle θ of the arm 10 is controlled to the target angle Ar.

[0059] Here, the tension control apparatus embodying the first invention, as compared the conventional Dan Salo Lumpur the tension controller, the effect shown in Figure 2 was confirmed. In this case, the compared specifications are the moment of inertia GD ² of the machine shaft,
It is mechanical loss (mechanical loss) and backlash. The moment of inertia of the device of the present invention has been reduced to about half that of the conventional device as compared with the moment of inertia of the conventional device. In addition, the mechanical loss was reduced from about 50 kg in the conventional apparatus to about 2 kg in the present apparatus in terms of the tension of the strip. This is because the above-mentioned conventional apparatus has a mechanical loss of Dan Salo Lumpur vertically moving mechanism, the first invention apparatus because with only friction torque of the bearing of the support shaft.

The backlash is present in the conventional apparatus, but is not present in the first invention apparatus. This is because the motor is directly connected to the arm support shaft.

Next, a second embodiment of the present invention will be described.

The second embodiment of the present invention is a tension control device having a configuration as shown in FIG.

As shown in FIG. 3, this tension control device
The device is the same as that of the first embodiment, and further includes a counter weight 60, a motor 50 for moving (shifting) the counter weight position, and a counter weight position detector 51.

The counterweight 60 is provided on the arm 10 so as to be movable in the longitudinal direction of the arm 10 (corresponding to the direction perpendicular to the axis 13). The counterweight 60 is positioned at the position in the longitudinal direction. The torque generated in the arm 10 is controlled by the adjustment. The movement of the counter weight 60 is performed by driving the motor 50 for shifting the counter weight. The position of the counter weight is detected by the counter weight position detector 51 and is input to the tension controller 22 (the self-weight compensation calculator 33 in the tension controller 22).

More specifically, the tension controller 22 sets the target tension T
The detected tension T is fed back to r and a comparison operation is performed.
A tension controller 30 for outputting a torque control command T1, a weight compensation calculator 33 for compensating an inertia moment of the weight of the movable transfer roll 9 and the arm 10 based on the detection angle θ of the angle detector 21; The position of the counter weight 60 is determined based on the target tension Tr and the tension angle compensation calculator 34 for compensating for the change in the relationship between the strip tension and the shaft torque of the electric motor 20 depending on the angle of the arm 10 (shaft torque compensation). And a counter weight position setting device 53 for setting.

The counter weight position setting device 53
According to the set target tension Tr, the counter weight 6
The position St of 0 is obtained by calculation, and the position St signal is input to the counter weight drive unit 52. The contents of the calculation of the counter weight position St will be described later in detail.

The counter weight driving section 52 moves the counter weight 60 by driving the counter weight position shifting motor 50 based on the input position signal, and the position of the counter weight 60 is obtained by the setting unit 53. It is set to the position that was set.

The strip speed controller 24 compares the target angle Ar with the detected angle θ and outputs a speed correction command to correct the angle of the arm 10 to output an angle controller 40.
And the output speed correction command, the speed of the bridle roll drive motor 23, and thus the bridle roll 1
Speed controller 4 for controlling the rotation speed of the arm 1 so as to keep the angle of the arm constant through the conveying speed of the strip 1
And 2.

The other configuration is the same as that of the first embodiment, and therefore the same reference numerals are given and the description is omitted.

Next, portions of the operation of the second embodiment that differ from the first embodiment will be described.

The target tension Tr is input to a counter weight position setting device 53, which calculates the position St of the counter weight 60 in accordance with the input target tension Tr, and generates a counter weight driving unit. Set to 52.

Here, when the target tension is set and when the setting of the target tension is changed, the counter weight position St is set.
Is set as follows.

First, the torque Tq required for the arm driving motor 50 is given by the following equation (3), where T is the strip tension.

Tq = 2 · T · Lr + Wm · Lm− (Ww · St + Wr · Lr + Wf · Lf) (3)

Here, Lr is the central axis of the movable transfer roll 9 and the axis 1 of the arm 10.
Lf: distance between the center of gravity of the arm 10 and the shaft 13; Lm: distance between the center of gravity of the motor 50 (including a detector, etc.) for the counter weight shift and the shaft 13; Weight, Ww: weight of counter weight 60, Wf: weight of arm 10, Wm: weight (including detector) of motor 50 for counter weight shift.

In the second embodiment, as shown in FIG. 3, the counterweight shift motor 50 is provided on the opposite side of the movable transport roll 9 with the shaft 13 interposed therebetween. The torque Wm.St acting on the arm 10 by Ww is in the same direction as the direction acting on the arm 10 due to the tension of the strip, as shown in the first term of the equation (3).

If the torque of the arm driving motor 20 is Ctq and the tension target value is Tref, the above (3)
From the equation, the position St of the counter weight is given by the following equation (4).

St = {2Tref · Lr + Wm · Lm− (Wr · Lr + Wf · Lf + Ctq)} / Ww (4)

The movable range of the counter weight 60 (the range between the maximum value and the minimum value of the position St) is defined by the maximum value and the minimum value of the tension target value Tref required for operation.
In consideration of the torque Ctq of the electric motor 20 and the other constants in the equation (4), a value that is economical and can satisfy required performance by keeping the moment of inertia as low as possible may be determined.

After the range in which the counterweight 60 can be moved is determined in this manner, the counterweight 60 is moved as close as possible to the shaft 13 of the arm 10 as far as the torque Ctq of the motor 20 allows. Determine the position St. As a result, the moment of inertia is reduced, and a state in which the tension control can be performed with high sensitivity is obtained.

After the position St of the counter weight is determined as described above, the counter weight 60 is moved to the position St of the determined counter weight when the timing for tension setting or the timing for changing the tension setting comes. The target tension Tref is obtained.

At this time, since the counter weight 60 is positioned at the position St with a certain speed pattern from the stop state, the tension is applied to the strip 1 at the same time as the tension setting timing or the tension setting change timing. The target value Tref cannot be obtained, and the tension control is delayed.

Therefore, in order to eliminate the control delay, first, the position of the counter weight 60 is detected by the detector 51 and fed back to the tension controller 22 to obtain the above (3).
The torque T of the electric motor 20 which becomes the target tension value Tref in the equation
Calculate q dynamically. Next, by inputting the calculated torque Tq to the current controller 31, the arm drive motor 20 applies the torque Tq to the arm 10.

In this way, it is possible to control the tension of the strip 1 to the target tension Tref without compensating for the delay in the tension control of the counterweight 60 and delaying the tension setting timing or the tension setting change timing. it can.

In the second embodiment, the counterweight 60 is provided movably on the arm 10 so that the position of the counterweight 60 in the direction perpendicular to the support shaft 13 can be adjusted. However, the provision of the counterweight in the second invention is not limited to the arm, if means that is movable in the perpendicular direction of the support shaft, it is also possible to provide a counterweight by any means.

[0086]

As described above, according to the first aspect, it is possible to control the tension with high responsiveness and high accuracy even to a steep strip fluctuation that has entered the central section or the like from the outside. It becomes possible.

According to the second aspect of the present invention, a small-capacity motor can provide a good response to a minute strip fluctuation, and
It is possible to control the tension with high accuracy.

Further, in any of the inventions, it is possible to control a desired target tension even when setting or changing the tension. Therefore, it is possible to perform highly effective tension control which can not be obtained by conventional Dan Salo Lumpur.

According to the investigation by the inventor, in the apparatus of the present invention, as a result of the improvement of the above-mentioned specifications, high-accuracy tension control is realized, and the effect of suppressing the fluctuation of the tension to about one third of the conventional one is obtained. It was confirmed that it was obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an overall configuration of a first embodiment of the present invention, including a partial arrangement diagram.

FIG. 2 is a diagram showing the effect of the first embodiment.

FIG. 3 is a block diagram showing an entire configuration of a second embodiment of the present invention, including a partial arrangement diagram.

Figure 4 is a layout diagram showing a configuration example of a tension control device according to the prior Dan Salo Lumpur.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Strip, 2 ... Transport roll, 9 ... Movable transport roll, 10 ... Arm, 11 ... Bridle roll, 12 ... Tension detector, 13 ... Support shaft, 20 ... Motor for driving an arm, 21 ... Arm angle detector, 22 ... Tension control unit, 23 ... Bridle roll drive motor, 24 ... Strip speed control unit, 25 ... Current detector, 30 ... Tension controller, 31 ... Current (torque) controller, 32 ... Motor drive, 33 ... Self-weight Compensation calculator, 34: Tension angle compensation calculator, 40: Angle controller, 41: Dead band generator, 42: Speed controller, 50: Electric motor for counter weight movement (shift), 51: Counter weight position detector, 52: counter weight driving unit, 53: counter weight position setting unit, 60: counter weight.

Continuation of the front page (56) References JP-A-1-308349 (JP, A) JP-A-2-86534 (JP, A) JP-A-2-169458 (JP, A) JP-A-57-38262 (JP) , A) JP-A-62-121166 (JP, A) JP-A-56-153552 (JP, A) JP-A-2-270754 (JP, A) Fully open 1980-164247 (JP, U) 3-53544 (JP, U) JP-B-51-146556 (JP, B2)

Claims (2)

(57) [Claims] An apparatus for controlling the tension of a strip by moving a strip between a transport roll and a movable transport roll, and moving the movable transport roll, wherein the apparatus pivots about a support shaft and the support shaft. An arm provided with the movable transfer roll at the opposite end, an electric motor directly connected to the support shaft, and generating a torque around the support shaft in the arm to apply tension to the strip; An angle detector for detecting the angle of the pivoting movement of the arm; a tension meter for detecting the tension of the strip; and a detection angle and the detected tension to correct the torque generated in the arm, and to adjust the tension of the strip. Tension control means for controlling to a target tension, and controlling the transport speed of the strip to a line target speed
When the change in the detection angle is large,
Transport speed of the strip so that the angle of the
A tension control device for correcting the strip speed . 2. A device for passing a strip between a transport roll and a movable transport roll, and controlling the tension of the strip by moving the movable transport roll. An arm for applying tension to the strip by a torque around the support shaft, the arm being directly connected to the support shaft, the arm being centered on the support shaft; And a motor for controlling the torque of the motor to control the torque generated by the motor on the arm, and a position in a direction perpendicular to the support shaft can be adjusted. A counter weight provided on the support shaft for generating a torque around the support shaft on the arm; Counter weight position adjusting means for adjusting the angular position and controlling the torque generated in the arm; an angle detector for detecting the angle of the turning movement of the arm; and detecting the tension of the strip. And a torque meter for controlling the motor torque control means and the counterweight position adjusting means based on the detected angle and the detected tension so that the strip tension becomes the target tension. Tension control means for controlling the strip conveying speed to the line target speed
When the change in the detection angle is large,
Transport speed of the strip so that the angle of the
A strip speed control means for correcting the tension.