JPH02160116A - Method for controlling tension of looper - Google Patents

Abstract

PURPOSE:To improve line efficiency without causing troubles such as meandering by adding and compensating the mechanical loss of a treating section to a tension controller of a drawing motor of a loop car. CONSTITUTION:A steel strip 1 enters a cleaning section 5 from a payoff reel 2 through a welder 3 and an inlet bridle rolls 4 for speed control and enters the next treating section through a horizontal looper 6. A wire drum 7 pulls the looper 6 and a motor 8 drives a wire drum 7. The motor 8 is controlled by a current controller 9, a tension reference signal is inputted from a tension reference generator 10 and a compensation signal DELTAI corresponding to the line speed V from a mechanical loss compensation signal generator 11 is added to this reference signal and controlled. Since the mechanical loss of the treating section is compensated in spite of change of the line speed and a suitable tension is kept, a trouble such as meandering of a matter to the treated does not occur.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a looper tension control method.

[Prior Art] In a conventional tension control method using a looper in a processing line that is equipped with a looper equipped with a horizontal loop car on the exit side of the processing section of a processing line for processing a strip, for example, a metal strip, the tension is controlled by a motor for driving the loop car. In this case, in controlling the silver motor, the set value of the looper tension is held constant regardless of the line speed.

[Problems to be Solved by the Invention] However, in the above-described conventional tension control method for horizontal louvers, the following problems have occurred because mechanical loss in the processing section is not taken into account.

In other words, there are mechanical losses in the processing section of the metal strip, and the causes are various, such as mechanical losses due to rotation of driven and non-driven rolls, frictional resistance between non-driven rolls and the workpiece, brush roll Examples include frictional resistance between the material and the workpiece, and fluid resistance when the workpiece travels in a fluid, but these mechanical losses are often a function of the line speed. In the conventional horizontal looper tension control method, which maintains the set value of the line tension in the loop car drive motor constant despite the change in mechanical loss in response to the change, depending on the line speed, the processing section On the input side, the tension of the processed material may become lower than the tension setting value of the looper, which may cause meandering of the processed material or other drastle. This provides a means to maintain the tension within an appropriate range.

[Means for Solving the Problems] A looper tension control method according to the present invention includes a tension control method for a processing line that includes a looper following a processing section, in which a tension control device for a drive motor of a loop car is connected to a tension control device for a loop car drive motor. This is a looper tension control method that installs a setting device that additionally compensates for mechanical loss.

[Function] The looper tension control method of the present invention provides a tension correction for the mechanical loss of the processing section as a function of line speed to the tension setting device of the tension control device of the driving motor of the loop car. This prevents a drop in tension at the entrance of the processing section due to loss of strength, and maintains the strip tension within an appropriate range over the entire length of the line.

[Embodiment] FIG. 1 is a flowchart showing an embodiment of the present invention. This embodiment, which will be described below with reference to the figure, shows the control of line tension in a section of a steel strip processing line that cleans the surface of the steel strip.

The steel strip y 71 is rewound by the payoff reel 2, the welder 3, and the speed controlled entry side priddle roll 4.
and is charged to the cleaning section 5, which is a processing section. After being cleaned by the cleaning section 5, the strip 1 is transferred via a horizontal looper 6 to the next processing section (not shown).

The horizontal loop car 6 is pulled by a wire drum 7, and the wire drum 7 is driven by a motor 8.

Next, the drive control system of the motor 8 according to the present invention will be explained. The motor 8 performs current control regarding line tension and is controlled by a current controller (ACR) 9. A tension reference signal from the horizontal looper tension reference generator 10 is input to the current controller 9, and feedback control is performed so that the current flows according to the set value.In the present invention, in addition to this tension reference signal, Four mechanical loss compensation signal generators 11 to which signals from one mechanical loss compensation signal generator 11 are added generate a compensation signal Δ■ corresponding to the line speed V. Therefore, even if the line speed changes, the mechanical loss of the cleaning section 5 corresponding to the line speed is compensated. As a result of processing the steel strip in the processing line by the inventive method as described above, the mechanical losses of the cleaning section corresponding to the line speed are compensated, the line tension at the entry side of the cleaning section is kept within a proper range, Problems such as meandering strips have completely disappeared. In the above embodiment, a surface cleaning line equipped with a horizontal loop car was described, but it goes without saying that the present invention can also be applied to other processing lines.

[Effects of the Invention] As described above, according to the present invention, in a processing line having a looper after the processing section, the mechanical loss of the processing section is compensated according to the change in line speed.
The efficiency of the line is improved because troubles such as meandering of the objects to be processed do not occur.

[Brief explanation of the drawing]

FIG. 1 is a flowchart showing one embodiment of the present invention. 1...Strip, 2...Payoff reel, 3...
・Welder, 4... Entrance side priddle roll, 5...
Cleaning section, 6...Loop calf...
Wire drum, 8... Motor 9... Current controller, 10... Looper tension reference generator, 11... Mechanical loss compensation signal generator.

Claims (1)

[Claims] A tension control method for a processing line in which a looper with a loop car is disposed next to the processing section, characterized in that mechanical loss of the processing section is compensated for by adding it to a tension control device of a drive motor of the loop car. Control method.