JP2588912Y2 - Static tension control circuit - 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 for a process line having a winding / unwinding machine, a looper and an accumulator, and more particularly to a static tension control circuit having a static tension function.

[0002]

2. Description of the Related Art In practical use of a tension control device, if a material to be controlled (steel plate, sheet, etc.) has slackness, the tension feedback signal has no or insufficient value when a static tension is applied. The motor is suddenly accelerated and appears as an excessive tension at the moment when the material is stretched, which causes poor quality of the material, breakage and mechanical stress. Therefore, it is necessary to apply a static tension from a state in which the material is stretched in advance.

[0003] In general practice of a tension control device,
As a method of increasing the static tension, first, loosening of the material is removed by a manual operation by a human, and the static tension is applied from a state where the tension is increased to some extent. Secondly, in order to prevent excessive tension from being applied at the time of static tension, the tension setter itself is cushioned so that the set output has a ramp-like characteristic.

[0004]

However, the conventional static tension control system has a problem in the automatic operation, and when increasing the tension setting output in a ramp form, a loop for taking in a current feedback signal is required. In addition, not only must the control system have a slow response, but if the material is loose, sufficient effects cannot be obtained.

[0005]

The present invention focuses on the fact that the drive motor suddenly accelerates due to lack of a feedback signal at the time of application of static tension, and a minor loop is added to the tension control system without processing the tension setting signal itself. As a control system for applying a rotation speed signal of the drive motor.

[0006]

According to the above-mentioned solution, when the static tension is applied due to the lack of the tension feedback signal or the like, the sudden acceleration of the drive motor is suppressed, and the application of the excessive tension can be prevented, and the stable static tension can be performed. Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

[0007]

FIG. 1 shows a main part of an embodiment of the present invention, wherein 1 is a drive motor for operating a drive motor, 2 is a controller for driving the drive motor, and 3 is a tension setting for applying a tension setting signal. , 4 is a tension detector that generates a tension feedback signal, 5, 7, and 11 are arithmetic units, 6 is a tension adjuster, 8 is a current detector that generates a current signal, and 9 is a rotation speed signal of the drive motor 1. The generated speed detector, 10 is a speed signal conditioner.

The example shown in FIG. 1 is applied to a conventional direct tension control system having a tension detector. However, instead of the tension detector, a well-known method such as obtaining a torque feedback signal is used. Needless to say, the present invention may be applied to the indirect control method. In this embodiment, a speed detector 9, a speed signal adjuster 10, and a calculator 11 for effecting at the time of static tension are added to a known direct tension control system. May be a component of the tension control system of the prior art, and a detailed description thereof will be omitted here. As shown in the figure, the speed signal controller 10 is shown with a specific first-order delay element {K / (1 + TS)}, but is not limited to this.

The operation of the apparatus shown in FIG. 1 is as follows. That is, in the tension control system shown in FIG. 1, according to the known tension calculation system including the tension setter 3, the tension detector 4, the calculator 5, and the tension adjuster 6, the output gain corresponds to the set amount of the tension. As described above, when the material is loosened, the drive motor 1 suddenly accelerates.

Here, the speed detector 9, the speed signal controller 10
And the minor loop of the arithmetic unit 11, the speed detector 9
Suppressing action based on the feedback signal according to the output or the level having the first-order lag of the output of the speed signal controller is exerted, so that the application of excessive tension is prevented and a stable static tension can be obtained.

[0011]

As described above, according to the present invention, it is possible to provide a static tension control circuit having a simple configuration in which sudden acceleration of the drive motor is suppressed particularly when static tension is applied.

[Brief description of the drawings]

[0012]

FIG. 1 is a system diagram showing a configuration of a main part of an embodiment according to the present invention.

[0013]

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drive motor 2 Controller 3 Tension setting device 4 Tension detector 5 Computing device 6 Tension regulator 7 Computing device 8 Current detector 9 Speed detector 10 Speed signal regulator

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H02P 1/00-1/58 H02P 5/00-5/52 H02P 7/00-7/80 B65H 23 / 00-26/08 B21C 45/00-49/00

Claims (1)

(57) [Scope of request for utility model registration] In a tension control device having a static tension function, when a static tension is to be applied, a rotation speed feedback signal of a drive motor is added as a minor operation correction signal to a stage subsequent to the tension control system. Static tension control circuit.