JPS5825964B2 - Band coil diameter measuring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for measuring the diameter of a coil of a strip in the process of winding or unwinding.

Sheets and plates are often manufactured continuously as strips.

In that case, the strip is wound into a coil at each step, and unwound at the beginning of the next step.

In order to control the winding or winding process, it is necessary to measure the diameter of the coil during the winding process.

A conventional example of such a device is a device that determines the coil diameter from the ratio of the rotation speed of the reel around which the coil is wound and the rotation speed of the roll that feeds the strip. You have to set the diameter of the
Furthermore, since the error caused by the slip between the roll and the strip material is large, there is a practical problem.

SUMMARY OF THE INVENTION An object of the present invention is to provide an apparatus that can accurately measure the diameter of a coil in a strip during the winding or unwinding process.

The device of the present invention is such that a mark is placed on the strip and the coil diameter is determined from the number of rotations of the coil while the mark travels a certain distance, and is not dependent on the number of rotations of the roll.

The present invention will be explained below with reference to the drawings.

The figure is a conceptual configuration diagram of an embodiment of the present invention, and is an example applied to the winding and unwinding process of a steel plate coil.

In the figure, CLl. CL2 is a steel plate coil, ST is a steel plate, and RL1 to RL3 are rollers.

Steel plate coil CL or steel plate S unwound from CL2
T is roller RL1 to RL3 or roller RL2, respectively.
．． It is sent to the next stage by RL3.

One of the steel plate coils CLI and CL2 is always unwound, and when the remaining amount of the unwound coil reaches a predetermined limit, it is switched to the other one, and a new steel plate coil is set in the meantime.

At the time of switching, welding is performed so that the steel plate S° C. is not interrupted.

During welding, the feed of the steel plate ST must be decelerated.

For this reason, it is necessary to measure the diameter of the coil while it is being wound to constantly know the remaining capacity, and to issue a deceleration command when the limit is reached.

D is a magnetic mark magnetizing head, Sl and S2 are magnetic mark detection heads, DC is a magnetic mark magnetizer, and SC1 and SC2 are magnetic mark detectors.

The magnetic mark magnetizer DC excites the magnetic mark magnetizer head D to attach a magnetic mark to the steel plate ST.

The magnetic mark is detected by the magnetic mark detection head S1. It is picked up at S2 and detected by magnetic mark detectors SC1 and SC2.

The magnetic mark detection heads S1 and 82 are arranged upstream and downstream of the steel plate ST, respectively, with a distance between them.

The magnetic mark magnetizing head D is arranged upstream of the magnetic mark detection head S1.

PG□~PG3 are pulse generators, CON is a control device, I
F is its input/output interface.

Each of the pulse generators PG1 and PG2 is a steel plate coil SC.
,.

The pulse generator PG3 generates a pulse proportional to the rotation speed of the roller RL3, that is, the feed speed of the steel plate ST.

These pulses are applied to the control device CON through the input/output interface IF.

There is also a magnetic mark magnetizer D on the input/output interface IF.
C and magnetic mark detectors SC1 and SC2 are connected.

The magnetic mark magnetizer DC excites the magnetizing head D according to commands from the control device CON.

The outputs of the magnetic mark detectors sc, , sc2 are given to the control device CON through the input/output interface IF.

The control device CON consists of a computer and the like.

The control device CON gives a command to the magnetic mark magnetizer DC to attach a magnetic mark to the steel plate ST, and generates a pulse 1PGr while this magnetic mark passes the detection head 81282.
(i = 1, 2), calculate the radius R of the steel plate coil CL using the formula described below, and if this value reaches the predetermined limit R8, the steel plate feeding device (surrounding road) with deceleration finger◆
give.

The formula for the radius R of the steel plate coil CLi is derived as follows.

When the magnetic mark moves by a distance, that is, the steel plate S
When T is unwound by length L, if the steel plate coil CLi rotates N times, then the following formula % formula % (1) During such rotation, the pulse generator PCi generates P pulses. , and the number of pulses generated per revolution is PC, then the following equation holds true.

From these equations (1) and (2), it is given by the steel plate coil CLi equation.

In the following equation (3), L and PC are constants given in advance, so the radius of the steel plate coil CLi can be determined based on the output pulse number P of the pulse generator PG.

The control device CON repeats the operation of magnetizing a magnetic mark on the steel plate ST at a certain sampling period and determining the radius of the steel plate coil CLi.

Equation (3) assumes that the radius of the steel plate coil CLi does not change while the steel plate ST is unwound by a length L.

However, in reality, the radius of the steel plate coil CL1 decreases by an amount corresponding to L, so when the value of L is equal to or larger than the circumference of the steel plate coil CLi, it cannot be ignored.

While the radius R of the steel plate coil CLi is far from the predetermined limit R8, the steel plate coil CL is adjusted based on the value including such an error.
There is no particular problem in determining the diameter of i, but when it approaches the limit R8, it must be determined based on a more precise value.

Therefore, a precise value can be obtained as follows.

At the n-th sampling, the steel plate coil CLj is determined by equation (3).
Find the radius Rn of and when this value is close to R8, the nth +
At the time of one sampling, the steel plate coil CLi is determined by the following formula.
Find the radius Rn+1.

However, t... Thickness of steel plate ST, Pl... Number of output pulses of pulse generator PGi during which magnetic mark detection heads S1 and 82 detect magnetic marks, P2... Magnetic mark detection head S2... The number of output pulses of the pulse generator PCi from the time when the magnetic mark is detected until the end of the n+1 sampling period.

In equation (4), the first term is the radius determined by equation (3) and includes an error corresponding to L.

The second term is a correction term, and is based on the rotation speed P1 of the steel plate coil CLi corresponding to L, and gives the reduction in the coil thickness due to unwinding.

Therefore, the sum of these represents the actual radius of the steel plate coil CLi at the time when the magnetic mark detection head S2 detects the magnetic mark.

The third term is the decrease in the coil thickness due to winding from the time when the magnetic mark detection head S2 detects the magnetic mark to the end of the (n+1)th sampling period.

Accordingly, equation (4) represents the actual radius of the steel plate coil CLi at the end of the n+1 sampling period.

Thereafter, in each sampling period, the radius of the steel plate coil CLi is determined by equation (4) and compared with a predetermined limit R8.

This allows the steel plate coil diameter to be monitored based on precise measurements.

The above is an example of the case where the present invention is applied to the winding of a steel plate coil, but the present invention is not limited thereto, and can be applied to the winding or winding of a strip-like coil.

Note that the marking on the band-shaped body is not limited to magnetic marking.

Furthermore, although the case of automatic deceleration has been described as an application example of the present invention, the application of the present invention is not limited thereto.

[Brief explanation of drawings]

The figure is a conceptual configuration diagram of an embodiment of the present invention. CLl, C10... Steel plate coil, RL1~RL
3...Roller, D...Magnetic mark magnetizing head, Sl, S2...Magnetic mark detection head, DC...Magnetic mark magnetizer, SC1, SC2
...Magnetic mark detector, PG1~PG3...
...Pulse generator, CON...Control device, I
F...Input/output ink face.

Claims (1)

[Claims] 1. A pulse generator that generates Pc pulses per revolution in proportion to the number of revolutions of the strip coil during winding or unwinding, a mark applicator that attaches marks to the strip, and marks attached to the strip. a first mark detector for detecting;
a second mark detector disposed a distance downstream from the first mark detector to detect a mark attached to the strip, the mark attached to the strip passing through the first mark detector; means for counting the number of output pulses P1 of the pulse generator from the time when the output pulse passes through the second mark detector; The diameter R of the strip coil is determined by the following formula using the output pulse Pc of the pulse generator per rotation of the strip coil and the distance between the first mark detector and the second mark detector. have the means to obtain