JP5298711B2 - Method and apparatus for detecting decrease in winding tension of metal band - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and apparatus for detecting a decrease in the metal strip winding tension which correctly determining the decrease in the tension with the generation of slip. <P>SOLUTION: This apparatus includes a no-load torque calculating part calculating the no-load torque of a pay-off reel during no-load running, an accelerating/decelerating torque calculating part calculating the accelerating/decelerating torque of the pay-off reel during accelerating/decelerating running and a tension decrease determining part determining the decrease in the tension from a positive or a negative variation of a value obtained by subtracting the accelerating/decelerating torque and/or the no-load torque from a torque feedback value of the pay-off reel. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention is directed to a line for controlling a tension applied to a metal band between a pay-off reel and a pay-off reel that adjusts the driving of a tension reel that winds the metal band. The present invention relates to a method and an apparatus for detecting a decrease in winding tension of a metal band, which detects a decrease in winding tension.

  When slip occurs between the metal strip and the roll that are continuously conveyed under tension, wrinkles enter the metal strip, leading to a decrease in yield and a decrease in production efficiency.

For this reason, as a method for detecting a decrease in tension of the metal band due to slip between the roll and the metal band, for example, there is a technique disclosed in Patent Document 1. This technique relates to a bridle roll slip detection method for detecting a slip generated between a belt-like material and a bridle roll for restraining the belt-like material. The driving motor torque of the bridle roll to be monitored is monitored, and the slip of the bridle roll itself is detected by comparing with the motor torque to be generated.
JP 2001-252711 A

  In a line having a tension measuring instrument (such as a tension meter roll), it is possible to detect a decrease in tension from the actual tension measured by applying the technique disclosed in Patent Document 1.

  However, in the line that does not have a tension measuring instrument, the actual tension value is calculated from the tension reel torque, so when the tension reel itself slips, it has an unknown amount of friction coefficient between the metal strip and the tension reel. In other words, the actual tension is calculated from the torque value of the tension reel, and there is a problem in that an accurate determination of the tension drop cannot be made.

  If the line stoppage is delayed due to a misjudgment despite slipping and the tension being lowered, the metal band meanders and comes into contact with the line equipment. In other words, the so-called double-folding may cause the metal band to be squeezed or broken in the line equipment. As a result, not only the quality of the product becomes nonconforming, but also the operation rate decreases due to the division processing of the nonconforming portion, the processing of the broken plate, and the like.

  An object of the present invention is to provide a metal belt winding tension decrease detection method and apparatus that can accurately determine a tension decrease associated with the occurrence of a slip, in view of these problems of the prior art.

The above problem can be solved by the following means.
[1] winding the metal strip by controlling the speed of the tension reel, the metal strip intended for Lula in to apply tension to the metal strip between the paying out payoff reel, the metal strip wound in the tension reel taken to detect the lowering of tension, a drop detection process of the metal strip winding tension, the acceleration and deceleration torque value and no-load torque value from a controlled torque value of the pay-off reel to maintain the line speed constant subtracting, reduction detecting how the metal strip winding tension and detecting the decrease of the metal strip winding tension by positive and negative changes in the subtraction after the torque value.

[2] winding the metal strip by controlling the speed of the tension reel, the metal strip intended for Lula in to apply tension to the metal strip between the paying out payoff reel, the metal strip wound in the tension reel A metal belt winding tension lowering detection device for detecting a lowering of the winding tension,
A no-load torque calculator for calculating a no-load torque value during no-load operation of the payoff reel;
A deceleration torque calculation section for calculating the acceleration and deceleration deceleration torque values during operation of the payoff reel, the acceleration and deceleration torque value from a controlled torque value of the pay-off reel to maintain the line speed constant and obtained by subtracting the previous SL unloaded torque, drop detecting equipment of the metal strip winding tension, characterized in that it comprises a tension reducing judging unit for judging tension reducing by positive and negative changes in the subtraction after the torque value.

  The present invention is directed to a line for controlling tension applied to a metal strip between a pay-off reel and a pay-off reel for adjusting the drive of a tension reel that winds up the metal strip, and a metal caused by slip on the tension reel. Since the decrease in belt winding tension is accurately detected, troubles such as squeezing in line equipment, squeezing due to doubling, and breakage can be prevented, product quality can be maintained, and non-conforming parts can be divided and broken plate It is possible to prevent the operating rate from being lowered due to the above process.

  The present invention adjusts the drive of a tension reel that winds up a metal strip such as a steel strip, and controls tension for a line that controls the tension applied to the metal strip between the payoff reel that pays out the metal strip. Slip detection with the tension reel being performed is performed by monitoring the torque of the payoff reel that is attracted by the tension of the metal band, not the tension reel that is controlling the tension of the line tension.

  By accurately detecting a decrease in the winding tension of the metal strip due to the slip on the tension reel, the line is surely stopped, and troubles such as entrainment in the line equipment, squeezing due to doubling, and breakage are prevented in advance. Prevents decline in line operation rate due to processing.

  FIG. 1 is a diagram showing a configuration example of a metal strip winding tension drop detecting device according to the present invention. In the figure, 1 is a metal band, 2 is a payoff reel (POR), 3 is a tension reel (TR), 4 is a speed detection roll, 5 is a speedometer, 6 is a motor, 7 is a drive device, and 8 is a no-load torque calculation. , 9 represents an acceleration / deceleration torque calculation unit, 10 represents a database (DB), and 11 represents a tension drop determination unit.

  The metal strip 1 paid out from the payoff reel (POR) 2 is taken up by a tension reel (TR) 3. A speedometer 1 such as a PLG is installed on the installed speed detection roll 4 to measure the line speed. The payout due to the rotation of the payoff reel (POR) 2 in the + direction shown in the figure is referred to as “POR upper payout”, and conversely, the payout due to the rotation in the −direction is referred to as “POR lowering”.

Normally, it controls the tension reel (TR) 3 at the target speed that is faster than the line the target speed, and tension in the metal strip 1. Therefore, in order to control the speed of the payoff reel (POR) 2 to the line target speed, the motor 6 that drives the payoff reel (POR) 2 generates torque in the reverse direction of rotation, and balances with the tension reel tension. doing.

  As the inner diameter of the tension reel slips, there is no tension in the metal band, and there is no force to rotate the payoff reel in the forward direction. . A change in the torque generated on the payoff reel is detected, and a decrease in tension on the tension reel is detected.

  Specifically, it is obtained by subtracting the acceleration / deceleration torque value calculated by the acceleration / deceleration torque calculation unit 9 and the no-load torque value calculated by the no-load torque calculation unit 8 from the torque feedback value obtained from the drive device 7. Based on the post-subtraction torque value, the tension drop determination unit 11 determines whether a tension drop has occurred.

  That is, the torque value after subtraction changed from a negative value to a positive value when the POR was raised, and when the POR was lowered, the torque value changed from a positive value to a negative value. It is determined that a decrease has occurred. If it is determined that a tension drop has occurred, a tension drop detection signal is output to quickly connect to necessary processing such as line stoppage.

The calculation of the acceleration and deceleration torque, the acceleration and deceleration torque calculation unit 9 from the DB 10, acceleration and deceleration rate, plate width, POR within, outside diameter, data such as a motor GD ² is transmitted is calculated. Further, the calculation of the no-load torque representing the generated torque during the no-load operation is performed by the no-load torque calculation unit 8 from the function or table of the motor speed feedback value based on the test data of the motor manufacturer or the like.

  One embodiment of the present invention will be described below. FIG. 2 is a diagram showing an outline of a recoiling line to which the present invention is applied. FIG. 3 is a diagram illustrating an example of an application result in the embodiment. The reference numerals in the figure are the same as those in FIG. 1, and the configuration of the metal belt winding tension drop detecting device according to the present invention is the same as the configuration shown in the lower part of FIG.

  The time-series data in FIG. 3 shows that when the metal strip 1 paid out from the payoff reel (POR) in the POR extended state is reversed and wound by the tension reel (TR) 3 in the negative direction, the tension reel ( 3 shows a series of line data in which a slip occurs at TR) 3, the slip is detected according to the present invention, and the operator performs a line stop operation (about 2.5 seconds after detection). Here, MRH is an abbreviation for master rheostat, and is a master speed command value that is a speed command value for the entire line. In this example, MRH is operated at a speed command value of 150 mpm constant. Usually, the tension reel and the payoff reel are controlled so as to become the master speed command value MRH.

  Due to the TR slip, the TR speed becomes 155 mpm by adding the speed bias of 5 mpm to the speed command 150 mpm, and the TR torque is an unstable value near zero. POR generates negative torque in the direction opposite to the rotation direction, but because the tension of the metal band is reduced by TR slip, POR generates positive torque in the payout direction by speed control.

  Thus, according to the present invention, by detecting the slip of TR by reversing the sign of the value of the POR torque, it is possible to quickly take a line stop treatment as in this example. As a result, it is possible to prevent troubles such as squeezing in line equipment, squeezing due to doubling, and breakage, maintenance of product quality, and prevention of reduction in operating rate due to division processing of nonconforming parts and processing of broken plates.

It is a figure which shows the structural example of the fall detection apparatus of the metal strip winding tension | tensile_strength which concerns on this invention. It is a figure which shows the recoiling line outline | summary to which this invention is applied. It is a figure which shows the example of an application result in an Example.

Explanation of symbols

1 Metal band 2 Payoff reel (POR)
3 Tension reel (TR)
4 Speed detection roll 5 Speedometer 6 Motor 7 Drive device 8 No-load torque calculator 9 Acceleration / deceleration torque calculator 10 Database (DB)
11 Tension drop judgment part

Claims (2)

By controlling the speed of the tension reel winding the metal strip, the metal strip to target the Lula-in to apply tension to the metal strip between the payout to payoff reel, of the metal strip winding tension in the tension reel A method for detecting a decrease in a metal belt winding tension that detects a decrease,
The deceleration torque value and no-load torque value from a controlled torque value of the pay-off reel to maintain the line speed constant by subtracting the reduction of the metal strip winding tension by positive and negative changes in the subtraction after the torque value A method for detecting a decrease in winding tension of a metal band, characterized by detecting. By controlling the speed of the tension reel winding the metal strip, the metal strip to target the Lula-in to apply tension to the metal strip between the payout to payoff reel, of the metal strip winding tension in the tension reel A device for detecting a decrease in a metal belt winding tension that detects a decrease,
A no-load torque calculator for calculating a no-load torque value during no-load operation of the payoff reel;
A deceleration torque calculation section for calculating the acceleration and deceleration deceleration torque values during operation of the payoff reel, the acceleration and deceleration torque value from a controlled torque value of the pay-off reel to maintain the line speed constant and before SL by subtracting the no-load torque value, drop detecting device for a metallic strip winding tension, characterized in that and a tension reducing judging unit for judging tension reducing by positive and negative changes in the subtraction after the torque value.