JPH0356404B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for contactlessly detecting the coil diameter of a coil on a winding or unwinding reel.

One way to detect this type of coil diameter is to use an eddy current distance detector, but in the past, the distance detector was fixedly placed relative to the coil, and the output varied in response to increases and decreases in the coil diameter. I am trying to find the coil diameter from

However, since this distance detector is a non-contact type, it has many advantages over a contact type that uses Tatsuchiroll, but since it uses magnetism, the measurable range is small, and the maximum coil diameter and reel The disadvantage is that it cannot be put to practical use in the case of large-diameter coils with large differences in diameter.

The present invention has been made to eliminate the above-mentioned drawbacks of the conventional technology, and has a configuration in which the distance detector is displaced by an amount corresponding to an increase or decrease in the coil diameter, and the coil diameter is calculated based on this displacement amount. Therefore, it is an object of the present invention to provide a coil diameter detection method that can accurately detect the coil diameter of a large diameter coil, which has been impossible in the past.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

In Fig. 1, 1 is the unwinding reel of the rolling line (reel diameter: r), 2 is the coil of rolled material wound on this unwinding reel (maximum coil diameter
Rmax), and in this example, it is assumed that the rolled material is unwound under a constant tension. ,
3 is a reel driving motor for the reel 1, and its speed is controlled by a speed control device (not shown). 4 is a pulse generator connected to the reel drive motor 3, and 5 is a counter, which counts the pulses P output by the pulse generator 4 as a rotation speed detector and outputs a counted value P(n). Reference numeral 6 denotes a non-contact type distance detector, which is supported by the drive shaft of the detector drive device 7 and faces the surface of the coil 2, and receives a facing distance signal f(g ) occurs. The detector drive device 7 is a linear reciprocating device and drives the distance detector 6 in the radial direction of the coil 2. A position detector 8 is connected to this detector drive device 7, and generates a detector position signal f(x) proportional to the forward/reverse movement amount x of the drive shaft 7A. Reference numeral 9 denotes a position control device, which is supplied with a deviation ε between the reference opposing distance signal Go output from the reference opposing distance setting device 10 and the above-mentioned opposing distance detection signal f(g), and outputs a correction of a magnitude corresponding to the deviation. A reverse drive signal is sent to the detector drive device 7. 11 is a coil diameter calculating device which samples the detector position signal f(x) output from the position detector 8 and calculates the coil diameter R(t)=Rmax-f(x) from the sampling value f(x)... …(1) is calculated and output.

This sampling time point t is determined by the sampling condition determiner 12, and the sampling condition determiner 12 calculates the count value P(n) output from the counter 5.
A sampling command signal S is generated every time the output (number of pulses) reaches a predetermined value Po, that is, every time the rewind reel 1 rotates no more. The predetermined value Po is given from the sampling condition setter 13.

In this configuration, when the coil 2 is unwound and the coil diameter decreases by ΔR, ε=f(g)−Go is input to the position control device 9, and a drive signal proportional to ε is generated. Since the signal is supplied to the detector driving device 7, the driving device 7 drives the distance detector 6 by Δx in the direction that makes the deviation ε 0, and the distance G between the distance detector 6 and the surface of the coil 2 is always the reference facing distance.
Keep in Go. In this way, as the coil diameter of the coil 1 decreases, the distance detector 8 moves by the amount of decrease.

On the other hand, the rotational speed N of the reel 1 is
The count value P(n) is taken out via the predetermined value
When Po is reached, the sampling condition determiner 12 generates the sampling command signal S, and the distance and the movement amount f(x) of the distance detector 6, which is the output of the position detector, are input to the coil diameter calculation device 11. ,
The coil diameter calculating device 11 calculates and outputs the coil diameter R(t) of the above equation (1).

In this embodiment, the coil diameter is calculated by the coil diameter calculation device 11 every time the output of the position detector 8 is sampled.
However, it goes without saying that the coil diameter may be determined as an average value by averaging the sampled values at a predetermined period.

The above embodiment describes the case where the reel is a rewinding reel, but when the reel 1 is used for rewinding, the coil diameter calculation device 11 calculates the coil diameter R(t)=f(x). ……(2) can be calculated.

As explained above, the present invention has a non-contact distance detector facing the coil surface at a predetermined spacing, and moves the distance detector by following the coil surface as the coil diameter increases or decreases. By adopting a configuration that detects the coil diameter from the amount, the distance between the distance detector and the coil is constant regardless of the size of the coil diameter, so even if the difference between the maximum coil diameter and the reel diameter is large, the coil diameter can be adjusted Can be detected without contact.

[Brief explanation of drawings]

The figure is a block diagram showing one embodiment of the present invention. 1... Reel, 2... Coil, 3... Reel drive motor, 4... Pulse generator, 5... Counter,
6...Non-contact distance detector, 7...Reel drive device, 8...Position detector, 9...Position control device, 1
0...Reference opposing distance setter, 11...Coil diameter calculator, 12...Sampling condition determiner, 13...
...Sampling condition setter.

Claims (1)

[Claims] 1. A non-contact distance detector disposed facing the coil on the winding or unwinding reel so as to be movable in the radial direction of the coil, and a detector drive for driving the non-contact distance detector in the radial direction of the coil. a position detector that is connected to the detector drive device and detects the amount of movement of the coil in the radial direction of the non-contact distance detector; Control with the position controller so that it is equal to the output value of the reference facing distance setter,
On the other hand, the number of revolutions of the reel is taken out via a number of revolutions detector, and each time the value of the output signal of the number of revolutions reaches a predetermined value, the amount of movement in the radial direction of the coil detected by the position detector is sampled. A method for detecting a coil diameter, characterized in that a coil diameter of the coil is calculated by a coil diameter calculation device based on the sampled value.