JPS6248731B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a strip tension control device in a continuous annealing device installed in a steel processing line.

FIG. 1 is a block diagram showing a conventional strip tension control device of this type, in which 1 is an annealing device installed in a steel process line (not shown), and 2 is a device for winding a strip 3 to be conveyed at a predetermined speed. A plurality of conventionally known bridle rolls are hung, for example, 4 is a drive motor with a speed reducer, 5 is a finger speed generator, 16 is a power supply device, and 7 is a speed adjustment device, and this speed adjustment device 7 is a voltage controller 9. , voltage detector 10, current controller 11, current detector 12, and speed controller 1
It is composed of 3 etc. 14 is a speed command value, 15 is a tension controller, 16 is a tension detector, 17
is the tension setting value.

A conventional strip tension control device of this type is constructed as described above. That is, a bridle roll 2 for conveying the strip 3 at a predetermined speed.
is driven by the drive motor 4, and the speed adjustment device 7 is controlled using the output signal of the command speed generator 5 as a feedback signal so that the speed becomes a predetermined speed set by the speed command value 14. It is done like this. On the other hand, the tension setting value 17 for setting the tension of the strip 3 uses the signal from the tension detector 16 as a feedback signal, and the tension controller 15 changes the control signal to a speed so that the tension of the strip 3 becomes a predetermined tension. By providing an output to the regulating device 7, when tension fluctuations in the strip 3 occur outside the annealing device 1, tension fluctuations are transmitted into the annealing device 1 via this strip 3. The annealing device 1 is configured to prevent tension fluctuations within the annealing device 1 from occurring.

However, in the above-mentioned conventional tension control device, the tension fluctuation of the strip 3 that occurs outside the annealing device 1 is detected only after it is detected that the tension fluctuation occurs inside the annealing device via the bridle roll 2. Since the tension control device 15 is configured to operate so as to suppress the tension fluctuation, there are drawbacks such as difficulty in reliably suppressing the tension fluctuation and obtaining a predetermined tension in a transient state. Ta.

This invention has been made with attention to this point, and by providing a tension detector between two sets of bridle rolls and controlling the tension by separating the bridle roll drive power source, it is possible to control the tension from the outside of the annealing apparatus. An object of the present invention is to provide a tension control device that can suppress the steep tension fluctuations in the annealing device from being transmitted to the inside of the annealing device.

That is, FIG. 2 shows an embodiment of the present invention, in which 1 is an annealing device, 2 and 22 are two sets of bridle rolls, 3 is a strip, 4 and 24 are drive motors, and 5 and 25 are fingers. 6, 26 are power supply devices, 7, 27 are speed regulators, and both speed regulators 7, 27 are voltage controllers 9, 29, voltage detectors 10, 30, current controllers 11, 31. , current detectors 12, 32, and speed controllers 13, 32
It is composed of etc. 14 is a speed command value,
15, 35 is a tension controller, 16 is a tension detector, 1
7 is a tension setting value.

The strip tension control device of the present invention is constructed as described above. That is, bridle rolls 2, 2 for conveying the strip 3 at a predetermined speed.
2 are configured to be driven by a pair of drive motors 4, 24 connected to separate power supplies 6 and 26, respectively, and both power supplies 6,
26 are connected to speed adjusting devices 7 and 27, respectively. One speed regulator 7 is controlled using the signal from one finger speed generator 5 as a feedback signal, and the other speed regulator 27 is controlled using the signal from the other finger speed generator 25 as a feedback signal. is being done. Furthermore, the difference between the tension applied to the strip 3 detected by the tension detector 16 disposed between one bridle roll 2 and the other bridle roll 22 and the tension setting value 17 is: The control output signal of one tension controller 15 is output to one speed controller 7 and is input as an input signal to one speed controller 13. Therefore, the tension at the position of the tension detector 16 is controlled by this, and the tension in the steady state is controlled in the manner described above.

Further, the other tension controller 35 is provided to prevent external tension fluctuations from being transmitted into the annealing device 1.
5, the signal of the tension detector 16 is used as a feedback signal,
The tension setting value 17 is used as a reference signal and its deviation signal is inputted, and furthermore, this tension controller 35 adds the tension control signal to the reference value of the current controller 31 in the other speed regulating device 27. , and is made to be input. The response of the control loop of this current controller 31 is 200rad/S.
Since it has a certain degree of responsiveness, in response to the tension control signal, a load signal corresponding to the tension control signal flows to the other drive motor 25 that drives the other bridle roll 22. It is now possible to absorb tension fluctuations that occur outside the annealing device 1, and steep tension fluctuations from the outside are not transmitted to the annealing device 1, allowing extremely stable operation of the annealing device. It is possible.

As described above, according to the strip tension control device of the present invention, two sets of bridle rolls 2, 22 for winding the strip 3 and conveying it in a predetermined direction can be connected to a plurality of rolls each having a power supply device 6, 26. A tension detector 16 is provided between the two sets of bridle rolls 2, 22, and both the drive motors 4, 2 are driven by the drive motors 4, 24.
Since tension control signals are input to each of the speed adjusting devices 7 and 27 in No. 4, there is no possibility that steep tension fluctuations from outside the annealing device 1 will be transmitted to the inside of the annealing device. This has the excellent effect of providing a highly accurate strip tension control device.

In the above-mentioned embodiment, a case was described in which the strip tension control device was used in an annealing device in a steel process line, but the strip tension control device of the present invention is limited to annealing devices. It goes without saying that the same effect can be obtained even if the method is used in other equipment in a steel process line.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a conventional strip tension control device, and FIG. 2 is a block diagram showing an embodiment of the present invention. In the drawing, 1 is an annealing device, 2 and 22 are bridle rolls, 3 is a strip, 4 and 24 are drive motors, 6 and 26 are power supply devices, 7 and 27 are speed regulators, and 9 and 29 are voltage controllers. , 10, 30 are voltage detectors, 11, 31 are current controllers, 12, 32 are current detectors, 13, 33 are speed controllers, 15, 3
5 is a tension controller. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] 1. A plurality of sets of bridle rolls for winding a strip and conveying the same in a predetermined direction are individually driven by a plurality of drive motors each having a power supply device, and the bridle rolls of the plurality of sets of The strip tension is characterized in that a tension detector is provided between the rolls, and a tension control signal is individually inputted to each of the speed control devices of the two drive motors to prevent sudden tension fluctuations in the strip. Control device. 2. Claim No. 2, characterized in that, in an annealing device installed in a steel process line, steep tension fluctuations from outside the annealing device are not transmitted to the strip in the annealing device. The strip tension control device according to item 1. 3. The strip tension control device according to claim 1, wherein a tension controller is provided between each of the tension detectors and the plurality of speed adjustment devices. 4. The strip according to claim 1, wherein the speed regulating device is constituted by a voltage controller, a voltage detector, a current controller, a current detector, and a speed controller. Tension control device.