JPH05107011A - Method and apparatus for measuring long material having magnetic property - Google Patents

Abstract

PURPOSE:To measure a long material having magnetic property at a high speed. CONSTITUTION:The specified position of a long material 1 having magnetic property is magnetized. The position of the magnetized point of the long material 1 is detected with magnetic-flux detectors 12, and the long material 1 is measured. In this measuring method, the high-speed magnetization is performed by using a magnetization accelerating circuit. The measuring apparatus has magnetizing heads 10a and 10b, to which accelerating circuits are attached, the magnetic-flux detecting parts 12 for detecting the position of the magnetizing points of the long material 1 and a signal processing part for processing the detected signals outputted from the magnetic-flux detecting parts 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a measuring method and a measuring device for a long member having magnetism.

[0002]

2. Description of the Related Art When measuring a long magnetic material,
While the long material is moving in a certain direction, the magnetizing head magnetizes a predetermined position of the long material, and the center position of the magnetizing point of the long material is detected by a magnetic flux detector that is a predetermined distance away from the magnetizing head. However, the scale was measured from the moving speed and the distance.

[0003]

However, in the conventional measuring method, when the moving speed of the long material is increased, the exciting speed of the magnetizing head does not follow and stable magnetization cannot be performed. It was difficult for the detector to detect the magnetization point. Therefore, the conventional method cannot measure at a high speed, and the productivity cannot be improved. In addition, when measuring a short distance, it was not possible to measure accurately unless the moving speed of the long material was further reduced.

Therefore, an object of the present invention is to provide a measuring method and a measuring device capable of measuring a long magnetic material at high speed.

[0005]

A measuring method for a long magnetic material according to the present invention is to magnetize a predetermined position of a long magnetic material, and to determine the position of a magnetizing point of the long material. In the method of measuring a long material by detecting it with a magnetic flux detector, magnetization was performed by high-speed magnetization using an acceleration circuit.

The measuring device for a long magnetic material according to the present invention comprises a magnetizing head for magnetizing the long magnetic material,
An accelerating circuit for accelerating the magnetizing operation of the magnetizing head is added to a measuring device including a magnetic flux detector for detecting the position of the magnetizing point of the long material.

The position of the magnetizing point of the long material is detected by a detecting section composed of a plurality of magnetic flux detectors. In this case, the center position of the N pole / S pole is detected as the center position of the magnetizing point of the long material, and the magnetizing is further performed simultaneously with the detection.

[0008]

In the present invention, by adding an accelerating circuit to the magnetizing power source of the magnetizing head, the time required for excitation is extremely shortened, and even if the long material moves at a high speed, it can be magnetized following it. Since it can be performed, it is possible to measure a long material at a high speed. This accelerating circuit has a capacitor as a power supply for supplying a predetermined current to the magnetizing coil, and it performs high-speed magnetization by instantaneous discharge of the capacitor and supports high-speed measurement of long materials by high-speed charging of the capacitor. ..

Although there is a problem that the accuracy of measurement is affected by changes in temperature and pressure applied to the long material, with respect to temperature changes, the magnetizing head and the magnetic flux detector are made of the same material as the long material. It can be ignored by selecting one.
Further, the pressure change can be dealt with by continuously measuring the tension applied to the moving long material and correcting it.

As the material of the long material which can be measured by the present invention, magnetic materials such as Fe, Ni and steel, and composite materials and alloys in combination with these magnetic materials are considered. In particular, a stranded aluminum wire with a steel core is mentioned.

[0011]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a block diagram of a scale device showing an embodiment of the present invention. The scale device includes a magnetizing unit including the magnetizing heads 10a and 10b, a magnetism detecting unit that detects a magnetized portion, and a signal processing unit that processes the detected signal.

As shown in FIG. 2, the magnetizing heads 10a and 10b are formed by winding a conductor wire 2 around an iron core 3 having a through hole 3a, and a magnetic force is generated by passing a current through the conductor wire 2. Then, the long member 1 having magnetism is passed through the through hole 3a to be magnetized. The magnetism detection unit includes a plurality of magnetic flux detectors 12 and detects magnetism at a plurality of points on the long material 1. The signal processing unit includes a level determiner 13, two polarizers 14a, 14
b, AND device 15, trigger generator 16, monostable multi-device 17, and exciter 18. The exciter 18 has an accelerator 2
0 is connected to accelerate the exciting operation of the magnetizing heads 10a and 10b, and the measuring operation is controlled by the scale count magnetizing switching circuit 21. Further, a marking control circuit 22 and a marker nozzle 22a are provided to mark the start and end points of the length measurement of the long material 1 with paint.

The measuring operation of the measuring apparatus having the above structure is as follows. First, the magnetizing operation is started by the manual magnetizing switch 19, and the long member 1 is moved in the direction of the arrow to pass through the magnetizing heads 10a and 10b for magnetizing. The marking 22b is attached to the long material 1 through the measuring scale. The two magnetization heads are appropriately selected and operated by the magnetization switching relays 11a and 11b.

When the magnetized portion also moves with the movement of the long material 1 and reaches the position of the magnetic flux detector 12, the magnetic flux detector 1
A detection signal is emitted from 2 and the position of the magnetized portion is detected. The detected signal is discriminated into noise and signal by the level determiner 13, and then the center position of magnetization is precisely detected, and signal processing of "1" or "0" is performed using the magnetizer 14a. Also in the polariser 14b, signal processing of "1" or "0" of the detection signal is performed. Then, when the AND device 15 confirms the existence of the AND condition, the trigger generator 16 and the monostable multi-device 17 output a signal at a predetermined moment "1". Based on this signal, the long material is automatically magnetized again while controlling the exciter 18, and this operation is repeated over the entire length of the long material 1. The scale accuracy is about ± 1 / 10,000.

FIG. 3 is a circuit diagram showing a specific configuration of the magnetizing heads 10a and 10b, the exciter 18 and the accelerator 20. In this circuit, electric charge is stored in the capacitor 34 via the resistor 32. The thyristors 36a to 36d are operated by the magnetization trigger signal, and the magnetization switching relay 11a
Alternatively, when one of the contacts of 11b is closed, the electric charge stored in the capacitor 34 is instantly discharged, and either of the magnetizing heads 10a or 10b is excited to magnetize the long material 1. The operation of the magnetizing head 10a is performed by the thyristor 36c,
36b and the relay 11a are turned on, and the operation of the magnetizing head 10b is performed by the thyristors 36d and 36a and the relay 1a.
It is performed by turning on 1b. The excitation by the capacitor 34 can be performed at a higher speed than the excitation by a normal AC power supply.

The magnetic flux generated from this magnetized portion is detected as a magnetic signal by the magnetic flux detector 12, and the thyristor 35 is turned on after 0.8 seconds. When the resistance value of the resistor 33 is smaller than that of the resistor 32, the thyristor 3
When 5 is turned on, a current flows through the resistor 33 to charge the capacitor 34 at high speed.

The thyristor 35 is automatically turned off after being turned on for 0.5 seconds. Charging is completed in 2/3 of the time from detection to the next detection with respect to the moving speed of the long material 1. In this way, high-speed measurement is possible. That is, the scale accuracy is the same as that of the conventional one (± 1 / 10,000), and the maximum speed is twice that of the conventional one. Comparator 3 is used for measuring the time of 0.8 seconds, 0.5 seconds, etc.
7 by comparing the potential of the capacitor 34 with the respective reference value. When the measurement is completed, the marking 22b is applied again.

By attaching a magnetizing head for a short scale, a scale of 1 m can be maintained at the conventional speed.

[0019]

As described above, according to the present invention, a long member having magnetism can be measured at high speed, productivity is improved, and workability is improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a scale device of the present invention.

FIG. 2 is an enlarged view of the magnetizing head 10a or 10b in FIG.

3 is a circuit diagram showing an example of a configuration of an exciter 18 and an accelerator 20 of FIG.

[Explanation of symbols]

 1 Long Material 2 Conductor 3 Iron Core 3a Through Hole 10a, 10b Magnetizing Head 11a, 11b Magnetization Switching Relay 12 Magnetic Flux Detector 13 Level Judge 14 Magnetizer 15 AND Generator 16 Trigger Generator 17 Monostable Multi-Layer 18 Excitation 19 Manual magnetizing switch 20 Accelerator 21 Scale counting magnetizing switching circuit 22 Marking 30 AC current sources 31a, 31b, 31c, 31d Diode 32, 33 Resistor 34 Capacitor 35, 36a, 36b, 36c, 36d Thyristor 37 Comparator

Claims (2)

[Claims] 1. A method for measuring a long material by magnetizing a predetermined position of a long material having magnetism and detecting a position of a magnetization point of the long material by a magnetic flux detector. A method for measuring a long material having magnetism, characterized by performing magnetization by high-speed magnetization using. 2. A measuring device comprising a magnetizing head for magnetizing a long member having magnetism, and a magnetic flux detector for detecting a position of a magnetizing point of the long member. A measuring device for a long member having magnetism, which is characterized by adding an accelerating circuit for accelerating a magnetizing operation.