KR100662755B1 - Method for controlling the operation of a tension-controlling system having a dancer-roll - Google Patents

Abstract

An operation control method of a tension-controlling system having a dancer-roll is provided to supply workpiece with a constant tension not only in an acceleration or a constant speed zone also in a stop or a deceleration zone by positioning the dancer-roll at the middle position in the deceleration or the stop zone. An operation control method of a tension-controlling system having a dancer-roll comprises a step(S41) where first and second inverters drives first and second electric motors; a step(S42) of commanding the fist and the second inverters to stop in order to stop a workpiece from progressing; a step(S43) where the first inverter decelerates or stops the first electric motor; a step(S44) where the second inverter drives the second electric motor to position the dancer-roll at the middle of a position zone by receiving the position information of the dancer-roll; and a step(45,46) of stopping the second electric motor when the dancer-roll is placed at the middle.

Description

METHOD FOR CONTROLLING THE OPERATION OF A TENSION-CONTROLLING SYSTEM HAVING A DANCER-ROLL}

1 is an explanatory diagram of a tension control system having a dancer roll;

Figure 2 is a flow chart of a conventional tension control system operation control method with a dancer roll.

3 is an explanatory view of a conventional tension control system operation control method with a dancer roll.

4 is a flow chart illustrating a method for controlling a tension control system having a dancer roll according to the present invention.

5 is an explanatory view of a method for controlling a motion of a tension control system having a dancer roll of the present invention.

** Description of the symbols for the main parts of the drawings **

S41 to S46: Tension control system motion control method steps with dancer roll according to the present invention

The present invention relates to a motion control method of a tension control system having a dancer roll. In particular, the inverter performs speed control in order to maintain a constant tension of a workpiece even during deceleration or completely stop for stopping. It relates to a motion control method of the tension control system having a dancer roll to maximize the.

The tension control system refers to a system that maintains a constant level of the tension of a workpiece to facilitate processing during transportation of the workpiece.

This tension control system can be in various ways depending on the purpose of the workpiece. Among these, a tension control system having a dancer roll is a system having a dancer roll that applies a constant force to the workpiece, and a constant tension is applied to the workpiece by maintaining a constant position of the dancer roll. Here, the constant force applied to the dancer roll is generated by spring, air pressure, gravity, and the like.

1 is an explanatory view of a tension control system having a dancer roll. As shown in FIG. 1, a workpiece 1, a first roll 2 for advancing the workpiece at the rear end of the workpiece in the traveling direction, and a first roll ( 2) the position of the first electric motor 3 for transmitting a force to the first motor, the first inverter 4 for driving the first electric motor 3, the dancer roll 5 for applying a constant tension to the workpiece, and the dancer roll 5; A converter 6 for converting the change into an electrical signal, a fixed roll 7 for movably supporting the workpiece to be subjected to a constant tension by the dancer roll 5, and the workpiece to advance in the forward direction of the workpiece. It consists of the 2nd roll 8, the 2nd electric motor 9 which transmits a force to the 2nd roll, and the 2nd inverter 10 which drives the 2nd electric motor 9 by receiving the position information of the dancer roll 5, and is input.

Referring to FIG. 1, first, the first electric motor 3 is started by the first inverter 4 and the second electric motor 9 is started by the second inverter 10. During a transient state, it will rock largely up and down.

At this time, the position signal of the dancer roll 5 is converted into an electrical signal and fed back to the second inverter 10. The second inverter 10 outputs a frequency as much as a compensation for the difference between the internally set dancer roll position value and the feedback dancer roll position value which is set in advance, thereby controlling the speed of the second electric motor 9. As a result, the position of the dancer roll 5 stays at the center point which is not biased up and down, thereby transmitting a uniform tension to the workpiece 1.

2 is a flowchart illustrating a method of controlling a tension control system with a conventional dancer roll. As shown in FIG. 2, a step of starting the first and second electric motors by operating commands to the first and second inverters (S21), When the dancer roll is moved upward, the output frequency of the second inverter is lowered to decrease the rotational speed of the second motor (S22). When the dancer roll is moved downward, the output frequency of the second inverter is increased to increase the rotational frequency of the second motor. It is made to increase the step (S23).

Accordingly, the dancer roll is positioned at the middle point of the dancer roll position section, thereby applying a constant tension to the workpiece.

On the other hand, when it is necessary to stop the progress of the workpiece, the stop command is given to the first and second inverters to stop the first and second electric motors, and the first and second inverters are independent of the position of the dancer roll. And stop the second electric motor.

This will be described with reference to FIG. 3.

3 is a diagram illustrating a conventional method for controlling the operation of a tension control system having a dancer roll. As shown in FIG. 3, when a stop command is given to the first and second inverters at a time t1, the first and second inverters The driving of the first and second motors is stopped or the first and second motors are simultaneously decelerated so that the first and second motors are stopped after t2, so that the dancer roll is positioned beyond the intermediate position after the time t1. do.

As described above, the method for controlling the operation of the tension control system having the dancer roll according to the prior art stops or decelerates the first and second motors simultaneously when the movement of the workpiece is to be stopped, so that the dancer roll is out of the intermediate position. As a result, there is a problem that can not provide a constant tension to the workpiece. This can be a factor that greatly deteriorates the quality of the workpiece.

Accordingly, the present invention has been made in view of the above problems, and even when the progress of the work is to be stopped, the dancer roll is maintained at an intermediate position to provide a constant tension to the work. It is an object of the present invention to provide a method for controlling a motion of a tension control system having a dancer roll to improve quality.

The operation control method of the tension control system with a dancer roll of the present invention for achieving the above object, by using the first and second motors respectively driven by the first and second inverters at both ends of the workpiece A tension control system for generating tension and maintaining the tension constant using a dancer roll in the middle of the workpiece, the tension control system comprising: inputting a stop command to the first and second inverters; After receiving the stop command, the first inverter stops driving the first motor, and the second inverter drives the second motor for a preset time to maintain the position of the dancer roll. Characterized in that configured to include.

In one embodiment of the present invention, the second electric motor is characterized in that the tension is generated to receive the dancer roll position information at the front end of the work direction of the workpiece to keep the dancer roll position constant.

In another embodiment of the present invention, the preset time is characterized in that it comprises a dancer roll, characterized in that the time when the change value of the dancer roll position converges within a preset range.

In another embodiment of the present invention, the second inverter receives a signal indicating a position of the dancer roll, detects a deviation between the position of the dancer roll and a preset position, and reduces the deviation. It is characterized by maintaining the position of the said dancer roll by driving two electric motors.

In another embodiment of the present invention, the preset position is characterized by having a dancer roll, characterized in that the middle of the position section of the dancer roll.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

4 is a flowchart illustrating a method for controlling a motion of a tension control system having a dancer roll according to an embodiment of the present invention, in which the first and second inverters drive the first and second electric motors (S41), Stop command to the first and second inverter to stop the process (S42), the first inverter stops or decelerates the first motor (S43), the second inverter receives the dancer position information to the dancer Step (S44) of driving the second electric motor so that the roll is maintained in the intermediate position of the position section, step (S45, S46) of stopping the driving of the second electric motor when the dancer roll is located in the intermediate position.

Here, the first electric motor may transmit the tension to the workpiece at the rear end of the work direction, and the second motor may transmit the tension to the workpiece at the front end of the work direction of the workpiece. In addition, the position information of the dancer roll may be provided by a transducer that detects the position of the dancer roll and converts it into an electrical signal.

Referring to FIG. 4, even when a drive stop command of the first and second motors is input to the first and second inverters, the second inverter does not immediately stop driving the second motor, and the dancer roll is not maintained in the intermediate position. If not, drive the second motor to maintain the dancer roll in the intermediate position.

5 is an explanatory diagram of a method for controlling a motion of a tension control system having a dancer roll according to the present invention. As shown in FIG. 5, a stop command is input to t1 and a second inverter during driving of the first motor and the second motor. If the first inverter immediately stops or decelerates the first motor to stop the second motor at t2, the second inverter continues to drive the second motor even after t1 so that the position of the dancer roll is maintained at the intermediate position. do.

As described above, although the embodiments of the present invention have been described in detail with reference to the drawings, the spirit and scope of the present invention should not be construed as being limited to the above embodiments, but rather in the appended claims and their equivalents. It must be decided by.

As described in detail above, the present invention drives the motor to maintain the dancer roll in the intermediate position even in the deceleration or stop region, thereby providing a constant tension to the workpiece in the deceleration or stop region as well as in the acceleration or constant speed region operation. The effect of maximizing the quality of the workpiece can be obtained over the entire part of the motor operation area.

Claims (5)

Tension is generated using first and second electric motors driven by the first and second inverters at both ends of the workpiece, and the tension is kept constant using a dancer roll in the middle of the workpiece. In the tension control system, Inputting a stop command to the first and second inverters; After receiving the stop command, the first inverter stops driving the first motor, and the second inverter drives the second motor for a preset time to maintain the position of the dancer roll. Motion control method of the tension control system comprising a dancer roll, characterized in that configured to include. The method of claim 1, The second motor is provided with a dancer roll, characterized in that for generating a tension to receive the dancer roll position information at the front end of the work direction of the workpiece to maintain the dancer roll position constant. How to control the behavior of the system. The method according to claim 1 or 2, The preset time is a motion control method of the tension control system, characterized in that the dancer roll characterized in that the time when the change value of the dancer roll position converges within a preset range. The method according to claim 1 or 2, The second inverter receives a signal indicating the position of the dancer roll, detects a deviation between the position of the dancer roll and a preset position, and drives the second electric motor in a direction to reduce the deviation, thereby providing the dancer. And a dancer roll for maintaining the position of the roll. The method of claim 4, wherein The preset position is a motion control method of the tension control system comprising a dancer roll, characterized in that the middle of the position section of the dancer roll.

Images