JP2011245538A - Method and device for controlling stop position of coil tale end in winder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for controlling a stop position of a coil tale end capable of improving the accuracy of stop position control by correcting errors by a method and device different from a method and device of improving the calculation accuracy of the maximum deceleration rate.SOLUTION: In the method for controlling a stop position of a coil tale end, in which a tail part of a steel strip is passed through a pinch roll of a winder, then a rotating speed of a mandrel is controlled based on a predetermined reference speed, and the coil tale end after winding the steel strip, is stopped at a predetermined position, the rotating speed of the mandrel is detected, then it is determined whether or not the rotating speed exceeds the reference speed. If the rotating speed exceeds the reference speed, a rotating speed and a pressing force of a wrapper roll pressing the coil are controlled so that the rotating speed of the mandrel is equal to the reference speed.

Description

  The present invention relates to a tail end fixed position stop control for stopping a tail end of a wound coil at a target position when the steel strip after rolling is wound by a winder, for example.

When the coil rotation is stopped after the coil has been wound by a winder in a steel sheet rolling line, the coil tail end stop position control is performed to stop the coil tail end at the target position in the shortest time. Has been done.
This tail end stop position control is basically performed as follows.

In FIG. 1, a rolled steel strip 1 is wound around a mandrel 3 via a pinch roll 2 and formed into a coil 4. A wrapper roll 5 is installed on the outer winding surface side of the coil, and fluttering of the coil tail end is prevented by pressing the outer winding surface of the coil before winding is completed. The wrapper roll 5 is supported by a cylinder device 6 so that the pressing force against the coil can be adjusted, and is rotated by an electric motor 7.
The motor 8 that drives the mandrel 3 is provided with a pulse generator (PLG) 9 that detects the number of rotations thereof, and a tail end passage detector 10 is provided in front of the pinch roll 2. 11 controls the rotational speed of the electric motor based on these signals and the like.

  After the tail end of the steel strip 1 passes the pinch roll 2, the control device 11 obtains a speed reference from the inertia moment of the coil, etc., controls the rotational speed of the mandrel 3 based on the speed reference, and winds the steel strip. In order to stop the coil tail end after being taken at the target position in the shortest time, the following arithmetic processing and motor rotation speed control are performed.

1) When the detection signal from the tail end passage detector 10 is input to the tail end position calculating means 12, the tail end position calculating means 12 counts the output pulse of the PLG 7 and determines the current position of the coil tail end on the coil. It is calculated by converting to the angle of.
2) The moment of inertia associated with the rotation of the coil is calculated by the moment of inertia calculating means 13 based on the coil diameter obtained separately.
3) Based on the calculated moment of inertia and the braking force of the motor (braking force of the mandrel), the maximum deceleration rate (positive value) that can stop the tail end of the coil at the target position in the shortest time is determined as the maximum deceleration rate. Calculation is performed by the calculation means 14.
4) When the vehicle decelerates from the current rotation speed at the maximum deceleration rate, the rotation angle (stop angle) required until the rotation stops is calculated by the stop angle calculation means 15.
5) The motor control means 16 determines whether or not a deviation between the current position of the tail end calculated by the tail end position calculating means 12 and a separately set target stop position (tail end position deviation) matches the stop angle. If they match, a deceleration start command is output to the mandrel driving motor 8.
6) After the start of deceleration, in order to perform deceleration at the maximum deceleration rate, the motor control means 16 calculates the motor speed reference for the tail end position deviation and outputs it to the mandrel driving motor 8.

  As described above, when the maximum deceleration rate is calculated only by the moment of inertia, an error occurs between the actual rate due to the influence of disturbance and calculation error, and it cannot be stopped at the target position accurately. Therefore, conventionally, as disclosed in Patent Document 1, the maximum deceleration rate is calculated more accurately in consideration of the material and thickness of the steel plate in addition to the moment of inertia.

However, it is difficult to make the error factor completely zero, and when calculating a deceleration rate larger than the maximum deceleration rate that can be actually taken by the winder, as shown in FIG. The coil tail end position will exceed the target position by the corresponding angle.
In such a case, since the mandrel is re-rotated by manual operation by the operator or by restarting the tail end stop position control, there arises a problem that the time until the tail end is stopped at the target position becomes unnecessarily long.

Japanese Patent Laid-Open No. 7-60347

  Therefore, an object of the present invention is to improve the accuracy of stop position control by correcting an error by another means, not a method of increasing the calculation accuracy of the maximum deceleration rate.

In the present invention, the wrapper roll installed in the winder is used for braking when stopping the rotation of the coil, so that the stop position control of the coil tail end can be performed without improving the accuracy of the calculation processing of the maximum deceleration rate. The accuracy of can be improved.
The gist of the present invention is as follows.
(1) After the tail end of the steel strip has passed the pinch roll of the winder, the rotational speed of the mandrel is controlled based on a predetermined speed standard, and the coil tail end after winding the steel strip is set to the target position. In the stop position control method for stopping the wrapping roll, when the rotation speed of the mandrel is detected and the rotation speed exceeds the reference speed, the wrapper roll pressing the coil so that the rotation speed of the mandrel becomes the speed reference The coil tail end stop position control method of a winder characterized by controlling the rotational speed and pressing force of a winding machine.
(2) A detector for detecting that the tail end of the steel strip has passed through the pinch roll, and after the detector detects the passage of the tail end, the rotational speed of the mandrel based on a predetermined speed reference In the stop position control device having a rotation speed control device that stops the coil tail end after winding the steel strip at the target position by controlling the rotation speed detecting means for detecting the rotation speed of the mandrel, and Rotational speed determination means for determining whether the rotational speed exceeds the reference speed, and the rotational speed of the wrapper roll that presses the coil and the coil pressing of the wrapper roll so that the rotational speed of the mandrel matches the speed reference A coil tail end stop position control device for a winder, comprising wrapper roll drive control means for controlling each of the forces.

  Even when a deceleration rate greater than the actual maximum deceleration rate is calculated due to disturbances or calculation errors, the mandrel rotation speed can be controlled according to the speed reference, and the coil tail end can be moved to the specified position in the shortest time. Can be stopped.

It is a figure which shows the basic composition of a steel strip winder, and the structure of the conventional coil tail end stop position control system. It is a figure which shows the structure of the tail end stop position control system which concerns on the embodiment of this invention. 6 is a time chart showing a change in the rotation speed of the mandrel after the start of deceleration.

In the present invention, in the stop position control of the coil tail end, the error is corrected by another means instead of the method of increasing the calculation accuracy of the maximum deceleration rate as in Patent Document 1.
Therefore, in the present invention, the wrapper roll installed in the winder is used for braking when stopping the rotation of the coil, and the accuracy of the stop position control is improved in the conventional stop position control system of the coil tail end. I was able to do it.

The configuration of the tail end stop position control system in the present invention is shown in FIG.
In this apparatus, in the winding machine shown in FIG. 1, the cylinder 6 that adjusts the pressing force against the coil outer surface of the wrapper roll 5 that suppresses the outer peripheral surface of the coil, and the electric motor 7 that rotationally drives the wrapper roll 5 are controlled. A wrapper roll control device 17 is provided.

  The wrapper roll controller 17 compares the actual deceleration rate of the mandrel based on the output pulse of the PLG 9, and the actual deceleration rate and the maximum deceleration rate calculated by the maximum deceleration rate calculator 14. Then, when the actual deceleration rate is smaller than the calculated maximum deceleration rate, the cylinder device 6 of the wrapper roll 5 is discriminated according to the difference between the rotational speed determination means 19 for determining the magnitude and calculating the difference. And wrapper roll drive control means 20 for controlling the pressing force and rotation speed of the wrapper roll by controlling the driving of the electric motor 7.

The control devices 11 and 17 in FIG. 2 perform the following arithmetic processing and wrapper roll drive control in addition to the processing 1) to 6) described above.
7) Upon receiving a deceleration start command from the motor rotation control means 16, the rotation speed detecting means 18 calculates the rotation speed of the mandrel after starting deceleration based on the output pulse of the PLG 9, and calculates the actual deceleration rate.
8) The rotational speed discriminating means 19 compares the actual deceleration rate with the maximum deceleration rate calculated by the maximum deceleration rate calculating means 14 to determine the magnitude and calculate the difference.
9) When it is determined that the calculated actual deceleration rate is smaller than the calculated maximum deceleration rate, the wrapper roll drive control means 20 applies a pressing force to the cylinder device 6 according to the magnitude of the difference between the two. A command to increase and a command to decrease the rotation speed are output to the electric motor 7.

  As a result, the rotation of the wrapper roll acts as a braking force, and the rotation speed of the mandrel can be reduced at a deceleration rate equal to or higher than the maximum deceleration rate restricted by the mandrel motor capability.

  Therefore, even if a deceleration rate larger than the actual maximum deceleration rate is calculated due to disturbance or calculation error, the mandrel rotation speed can be controlled according to the speed reference, and the coil tail end can be controlled in the shortest time. It can be stopped at a predetermined position.

  In the above embodiment, the case where the control system of the wrapper roll is applied to the method of calculating and controlling the maximum deceleration rate based on the moment of inertia and the braking force of the mandrel has been described. The main control means for controlling the rotational speed of the electric motor is not limited to the case described above, and the mandrel is rotated based on a predetermined speed standard after the tail end of the steel strip passes through the pinch roll. Of course, the present invention is applicable to any stop position control method that controls the speed and stops the coil tail end after winding the steel strip at the target position.

  According to the present invention, since the accuracy of stop position control can be improved in a conventional coil tail end stop position control system, a great industrial applicability can be expected.

DESCRIPTION OF SYMBOLS 1 Steel strip 2 Pinch roll 3 Mandrel 4 Coil 5 Wrapper roll 6 Cylinder device 7 Motor for rotating wrapper roll 8 Motor for driving mandrel 9 Pulse generator (PLG)
DESCRIPTION OF SYMBOLS 10 Tail end passage detector 11 Control apparatus which carries out deceleration control of mandrel 12 Steel strip tail end position calculation means 13 Inertia moment calculation means 14 Maximum deceleration rate calculation means 15 Stop angle calculation means 16 Electric motor rotation control means 17 Wrapper roll control apparatus 18 Rotation Speed detection means 19 Rotational speed discrimination means 20 Wrapper roll drive control means

Claims (2)

After the tail end of the steel strip passes through the pinch roll of the winder, the rotational speed of the mandrel is controlled based on a predetermined speed standard, and the coil tail end after winding the steel strip is stopped at the target position. In the stop position control method,
When the rotation speed of the mandrel is detected and the rotation speed exceeds the reference speed, the rotation speed and pressing force of the wrapper roll pressing the coil are controlled so that the rotation speed of the mandrel becomes the speed reference. A coil tail end stop position control method for a winder. A detector that detects that the tail end of the steel strip has passed the pinch roll, and after the detector detects the passage of the tail end, the rotational speed of the mandrel is controlled based on a predetermined speed criterion. In the stop position control device having a rotation speed control device for stopping the coil tail end after winding the steel strip at the target position,
Rotation speed detection means for detecting the rotation speed of the mandrel, rotation speed determination means for determining whether or not the detected rotation speed exceeds the reference speed, and the rotation speed of the mandrel so as to match the speed reference, A coil tail end stop position control device for a winder, comprising wrapper roll drive control means for controlling a rotation speed of a wrapper roll pressing a coil and a coil pressing force of the wrapper roll.

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