JPH06160004A - Length measuring device for steel panel - Google Patents

Abstract

PURPOSE:To measure the length of a moving steel panel in a non-contact state by simple constitution. CONSTITUTION:Magnetizing electromagnets 12A,12B are provided in the moving direction of a steel panel 1 so as to provide a distance L0 between the electromagnets and a pulse of a constant cycle is simultaneously supplied to the electromagnets by a magnetizing pulse generator 11 to magnetize the steel panel 11 with magnetic poles A, B in a non-contact state. A magnetic detector (Hall element) 15 detecting the magnetic poles A, B in a non-contact state is provided on the downstream side of the electromagnets and the detection pulses PA, PB thereof are inputted to counters 20, 21 to count the reference pulse CL between the detection pulses PA, PB and PB, PA and the moving length and speed of the steel panel 1 are calculated from the count values of the counters 20, 21 on the basis of the distance L0 between the electromagnets 12A, 12B by an operation device 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a length measuring device for a steel plate or the like for processing a steel plate or the like sent out by a roll according to the purpose.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 3, a steel plate length measuring device is in contact with a steel plate 1 fed by a feed roll R to rotate a length measuring roll MR in contact, and is rotated by this roll 2. The length or speed of the steel sheet is measured by counting the pulses of the pulse generator PG with a counter.

[0003]

In the steel plate length measuring apparatus using the conventional length measuring rolls, slips occur between the steel plate and the length measuring rolls, or the rolls are worn, so that there is an error in measurement. Occur.

Although this error has been put into practical use by taking measures such as controllably correcting it, accurate length measurement cannot be expected. For this reason, it is possible to measure the length by a non-contact type, but a non-contact type and simple length measuring device has not yet been put to practical use.

The present invention has been made in view of the above conventional problems, and an object thereof is to measure a length of a moving steel plate or the like with a simple structure in a non-contact manner. To provide a device.

[0006]

In order to achieve the above object, the length measuring apparatus of the present invention comprises: (1) a magnetizing pulse generator for outputting a fixed period pulse; and a length direction of a length-measurable body. Two magnetizing electromagnets which are arranged at a predetermined distance and which are magnetized at the same time in a non-contact manner to the length-measuring body by energization of the fixed-cycle pulse, and the length-measuring-body A magnetic pole detector for detecting the magnetic pole magnetized in the non-contact manner, a counter for sampling a reference pulse by the detection pulse of the magnetic pole detector, and a count value of the counter based on the distance between the two electromagnets. And an arithmetic unit for calculating the moving length of the length-measurable body.

Alternatively, (2) a magnetizing pulse generator that outputs a fixed-cycle pulse, an electromagnet that magnetizes the length-measurable body in a non-contact manner by energizing the fixed-cycle pulse, and a predetermined portion downstream of the electromagnet. A magnetic pole detector which is arranged at a distance of 1 to detect a magnetic pole magnetized to the length-measurable body, a counter which samples a reference pulse with the pulse of the magnetizing pulse generator and the detection pulse of the magnetic pole detector, and the electromagnet And an arithmetic unit for calculating the moving length of the length-measurable body from the count value of the counter with the distance between the magnetic pole detectors as a reference.

[0008]

[Action]

In the length measuring device of (1), the two magnetizing electromagnets simultaneously magnetize the length-measurable body in a non-contact manner each time a pulse is supplied from the magnetizing pulse generator. The magnetic pole detector detects this magnetization one after another without contact and outputs a detection pulse.

The counter samples the reference pulse with this magnetic pole detection pulse, and counts the time reference pulse in which the length-measurable body moves a distance between the two magnetizing electromagnets.

The arithmetic unit calculates the moving length of the length-measurable body from the count value of the counter with reference to the distance between the magnetizing electromagnets.

In the length measuring device of (2), the magnetizing electromagnet magnetizes the length-measurable body in a non-contact manner each time a pulse is supplied from the magnetizing pulse generator. When the magnetized magnetic pole moves to the magnetic pole detector, the magnetic pole detector detects it without contact and outputs a detection pulse.

The counter samples the reference pulse with the magnetizing pulse and the detecting pulse, and counts the time reference pulse when the length-measurable body moves a distance between the magnetizing electromagnet and the magnetic pole detector.

The arithmetic unit counts the moving length of the length-measurable body from the count value of the counter with reference to the distance between the magnetizing electromagnet and the magnetic pole detector.

[0014]

Embodiments of the present invention will be described with reference to FIGS.

In FIG. 1, 1 is a strip-shaped steel plate continuously fed by a feed roller R, 11 is a magnetizing pulse generator that generates a pulse at a predetermined cycle T, and 12A and 12B are predetermined in the traveling direction of the steel plate 1. A magnetizing electromagnet that is arranged at a distance L _{0 of 2} and is simultaneously energized with pulses of a period T of the magnetizing pulse generator 11 to simultaneously generate magnetic poles A and B of opposite polarities on the steel plate 1.

A hall element (magnetic pole detector) 15 is arranged downstream of the magnetizing electromagnet 12A and detects the magnetic field H generated by the magnetic poles A and B of the steel plates magnetized by the magnetizing electromagnets 12A and 12B. , 16 are current supply sources of this Hall element.

Reference numeral 18 is a waveform shaping circuit for shaping the signal P detected by the Hall element 18, 19 is a reference pulse generator, and 20 is a reference pulse generator.
2 is a counter for counting the reference pulse CP between the detection pulses P _A and P _B shaped by the waveform shaping circuit 18 as shown in FIG. 2, and 21 is the reference between the detection pulses P _B and P _A from the waveform shaping circuit 18. A counter that counts the pulses CL.

Reference numeral 22 is an arithmetic unit for calculating the length and speed from the count values M and N from the counters 20 and 21, and the count values M and N from the counters 20 and 21 and the electromagnets 12A and 1A.
An arithmetic unit 23 that calculates the moving length of the steel sheet 1 from the distance L _{0 of} 2B to the period T of the magnetizing pulse; and an arithmetic unit 24 that accumulates the calculation results of the arithmetic unit 23 and outputs the length. It is composed of a calculation result of the calculation unit 23 and a calculation unit 25 which outputs the speed V from the period T of the magnetizing pulse.

Reference numeral 26 is a stop judging circuit for judging the stop of the steel sheet feeding from the magnetizing pulse and the detection signal having the waveform formed.

Next, the operation of this embodiment will be described.

The magnetizing electromagnets 12A and 12B are energized with a pulse having a period T from the magnetizing pulse generator 11, and the moving steel plate 1 has magnetic poles A and B having opposite polarities at a distance L ₀ at every period T. Be magnetized.

The magnetized magnetic pole is detected by the Hall element 15 when it reaches the position of the Hall element 15 as the steel sheet moves. The polarity of the detection signal P is alternately inverted because the magnetized magnetic poles A and B have opposite polarities. The detection signal P is waveform-shaped by the waveform shaping circuit 18 to become detection pulses P _A and P _B as shown in FIG.

As shown in FIG. 2, the counter 20 counts the reference pulse CP between the detection pulses P _A and P _B ,
The counter 21 counts the reference pulse CP during the detection pulse P _B to P _A and outputs the count values M and N, respectively.

The arithmetic unit 23 in the arithmetic unit 22 calculates the length of the steel sheet moving during the period T seconds of the magnetizing pulse as [(M +
N) / N] × L ₀ . However, if the length of movement during this T seconds is integrated by the calculation unit 24 for each cycle of the pulse P _A , the length L of movement during the integration period of the steel sheet can be obtained.

Further, the length of movement in T seconds obtained by the arithmetic unit 23 is divided by the period T in the arithmetic unit 25 to obtain the steel plate 1
The speed V can be calculated.

If the period T or the distance L ₀ is set to a unit time and a unit length, the arithmetic processing becomes simple.

The stop determination circuit 26 when the next pulse P _A is detected before the pulse P _B after the pulse P _A has been detected is detected, or the pulse P _A is after a predetermined generated time If the pulse P _A is not detected, the steel plate stop is determined.

Although two magnetizing electromagnets are used in the above embodiment, one magnetizing electromagnet is used and the distance between this electromagnet and the Hall detector is set to L ₀ , similar to the above embodiment. Can be processed by the principle of. Further, in the above embodiment, the length measurement and speed detection of the steel sheet have been described, but needless to say, the present invention is not limited to the steel sheet and can be performed in the same manner as long as the material can be magnetized such as shaped steel and pipe.

[0029]

Since the present invention is configured as described above, it has the following effects.

(1) Since the moving length and speed of a moving steel plate or the like can be measured in a non-contact manner, there is no error due to wear or slip of the contact roll as in a contact type length measuring device, and stable. The measured length can be performed.

(2) A moving steel plate or the like is magnetized at a constant period, and the length and speed are obtained by detecting the magnetization and counting and calculating reference pulses. It is possible to be configured to be economically advantageous.

[Brief description of drawings]

FIG. 1 is a structural explanatory view of a length measuring device according to an embodiment.

FIG. 2 is a functional explanatory diagram of a counter in the embodiment.

FIG. 3 is a structural explanatory view of a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Steel plate 11 ... Magnetization pulse generator 12A, 12B ... Magnetization electromagnet 15 ... Hall element (magnetic pole detector) 16 ... Current supply source to a hall element 18 ... Waveform shaping circuit 19 ... Reference pulse generator 20, 21 ... counter 22 ... computing unit 23 - 25 ... computing unit 26 ... stop decision circuit A, B ... pole CP ... reference pulse L ₀ ... distance MR ... length measuring roller P ... detection signal P _A, P _B ... detection pulse PG ... Pulse generator R ... Roll for feeding

Claims (2)

[Claims] 1. A magnetizing pulse generator that outputs a fixed-cycle pulse and a magnetizing pulse generator that are arranged at a predetermined distance in the length direction of the length-measuring body and are energized by the fixed-cycle pulse without contacting the length-measuring body at the same time. Two magnetizing electromagnets that are magnetized, a magnetic pole detector that is arranged downstream of the two electromagnets and that detects the magnetic pole magnetized by the length-measurable body in a non-contact manner, and the detection of the magnetic pole detector A counter for sampling a reference pulse with a pulse; and an arithmetic unit for calculating the moving length of the length-measurable body from the count value of the counter with reference to the distance between the two electromagnets. Measuring equipment for steel plates, etc. 2. A magnetizing pulse generator that outputs a constant period pulse, an electromagnet that magnetizes the length-measurable body in a non-contact manner by energizing the constant period pulse, and a predetermined distance downstream of the electromagnet. A magnetic pole detector arranged to detect a magnetic pole magnetized to the object to be measured, a counter for sampling a reference pulse with the pulse of the magnetizing pulse generator and the detection pulse of the magnetic pole detector, the electromagnet and the magnetic pole detection A length measuring device for a steel plate or the like, comprising: a calculation device that calculates a moving length of a length-measurable body from a count value of the counter with a distance between the devices as a reference.