JP2988296B2 - Magnetization error discrimination method and apparatus in magnetization measuring method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting and discriminating occurrence of a magnetization error in a magnetized measuring method for measuring the length of a magnetic long material such as a steel wire, that is, a magnetic long material. And its device.

[0002]

2. Description of the Related Art As a method for measuring the magnetism of a long material having magnetism, first, as shown in FIG. Then, at a position separated from the magnetizer 2 by a predetermined distance L, a center position (referred to as a magnetization point) of the magnetized position of the long material 1 is detected using the magnetic flux detector 3, The next magnetization is instantaneously performed by the magnetizer 2. By repeating such an operation, the number of times of detection of the magnetization point is accumulated, and the length of the long material is measured based on this. Have been done.

[0003]

In the conventional measuring method, since the magnetizing point is detected by the magnetic flux detector 3 and then magnetized instantaneously, the speed of the magnetized position judging device 4 and the exciter 5 can be increased. Has been measured. As a result, the devices used are sensitive to noise, and various measures against noise have been implemented. However, double magnetization for unknown reasons may occur, though rarely. SUMMARY OF THE INVENTION An object of the present invention is to provide a method for determining a magnetization error in a magnetization measuring method and a device used for the method, which compensate for the above-mentioned disadvantages of the prior art and detect the occurrence of a magnetization error to determine an abnormality. .

[0004]

SUMMARY OF THE INVENTION According to the present invention, a magnetizer magnetizes a predetermined position of a moving magnetic long material, and sets a magnetized point at a predetermined distance from the magnetizer. While repeating the magnetization and the detection of the magnetization point, which are detected by the detector, the number of times the magnetization point is detected is accumulated, and based on this, the length of the long material is measured. During the movement of the material, the amount of movement obtained based on the magnetization detection signal emitted from the detection of the magnetization point to the detection of the subsequent magnetization point,
During this time, a function is provided to detect the occurrence of a magnetization error by comparing the amount of movement of the magnetic long material obtained from the rotation angle of the rotating body that is pressed against and rotates with the magnetic long material, and to determine an abnormality. Things.

[0005]

FIG. 1 shows an apparatus used in the magnetometer method according to the present invention. Magnetic long material 1 moving in the direction of the arrow
The magnetizer 2 and the magnetic flux detector 3 are separated by a predetermined distance along
Is installed. The magnetic flux detector 3 includes a magnetized position determiner 4
Is connected, and when the magnetized position reaches the magnetic flux detector 3, an excitation signal is generated at the center position (magnetized point) and the exciter 5
Send to A rotating body 6 for detecting the movement of the long magnetic material 1 is pressed against the long magnetic material 1, and rotates without slipping with the movement of the long magnetic material 1. And converted into an electric signal by the signal converter 8. Hereinafter, the operation will be described in more detail. In the first magnetization, the excitation signal from the magnetization position determiner 4 is sent to the exciter 5 by manually operating the magnetization command switch 12, and the magnetic elongated member 1 is magnetized by the magnetizer 2.
Next, when the magnetic long material 1 moves and the first magnetized position reaches the magnetic flux detector 3, an excitation signal is sent from the magnetized position determiner 4 to the exciter 5 at the magnetized point, and instantaneously. The next magnetization is performed by the magnetizer 2. On the other hand, at the same time as the first magnetization is performed, the output of the rotation angle detector 7 connected to the rotating body 6 is taken into the magnetization error discriminator 9 via the signal converter 8, and the rotating body at that time is detected. The movement position is recorded as zero. As the rotating body 6 rotates due to the movement of the magnetic long material 1, the angle output from the rotation angle detector 7 is input to the magnetization error discriminator 9 via the signal converter 8. This input is the magnetic flux detector 3
Detect the next magnetization point, and are integrated until the magnetization detection signal from the magnetization position determination unit 4 is input to the magnetization error determination unit 9. When the next magnetization detection signal is input to the magnetization error discriminator 9, the magnetization error discriminator 9 determines the amount of movement of the magnetic long material 1 based on the rotation angle integrated during this time, and the magnetization detection signal. And the amount of movement of the magnetic long material 1 obtained based on the above. The amount of movement of the magnetic long material obtained based on the magnetization detection signal is
It is obtained as follows. As shown in FIG.
The distance between the center positions of the magnetic flux detector 3 and the magnetic flux detector 3 is defined as L, and this distance L is precisely measured in advance. Here, the magnetic flux detector 3
Corresponds to the position for detecting the center position (magnetization point) of the magnetized position. If the magnetization is performed correctly, from when the magnetization detection signal is generated by the detection of the first magnetization point to when the magnetization detection signal is generated by the detection of the next magnetization point,
The magnetic long material moves by a distance L. If the magnetization is not performed correctly, a magnetization detection signal is generated by detecting the first magnetization point, and then a magnetization detection signal is generated by detecting the next magnetization point, as in the above case. Even during this time, the moving amount of the magnetic long material moving during this time is different from L. However, this alone cannot determine the difference. Therefore, in the present invention, the amount of movement is obtained from the rotation angle of the rotating body that is rotated without slipping along with the movement of the magnetic long material, and is compared with this. For example, as a result of the comparison, if the difference exceeds ± 1/10 of L, it is determined that the measurement error is abnormal, the abnormality indicator 10 is operated, and the output device 11 moves the magnetic long material 1. Stop. In the above description, the comparison was made at each time from the magnetization to the next magnetization. However, if the two detected movement amounts are always integrated, the comparison is not possible at each time. Even the slightest missing error can be found when it appears as a large error. The magnetization is automatically performed except for the first time.

As substances applicable to the present invention, substances having magnetism, that is, iron, Ni, steel, and composite materials and alloys made by combining them can be considered. Particularly, an aluminum stranded wire containing a steel core is suitable.

[0007] The temperature change can be neglected by selecting and using an alloy material having the same coefficient of thermal expansion as the magnetic long material for the magnetic flux detector and the magnetizer. Further, with respect to the change in the tension applied to the magnetic long material, the tension applied to the magnetic long material during the movement is continuously measured and corrected.

[0008]

According to the present invention, if a magnetization error occurs, it can be detected immediately. If the magnetization error exceeds a preset error range, an abnormality is notified and the apparatus is started. Because it can be stopped, it was possible to respond quickly and the cause investigation became easier to carry out. The measuring accuracy is the same as before, or ±
The difference of 1/10000 is to some extent.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an apparatus used in the measuring method of the present invention.

FIG. 2 is a schematic view of an apparatus used in a conventional measuring method.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Magnetic long material 7 Rotation angle detector 2 Magnetizer 8 Signal converter 3 Magnetic flux detector 9 Magnetization mistake discriminator 4 Magnetization position judging device 10 Abnormality indicator 5 Exciter 11 Output device 6 Rotating body 12 Magnetization command switch

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-7-193931 (JP, A) JP-A-5-107011 (JP, A) JP-A-61-262601 (JP, A) JP-A-56-196 117101 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) G01B 7/00-7/34 102 G01B 21/00-21/32 H01F 13/00

Claims (3)

(57) [Claims] 1. A magnetizer and a magnetic flux detector installed at a predetermined distance along a traveling direction of a magnetic long material to repeat magnetization and detection of a magnetization point, and a magnetization detection signal. A method for determining a magnetization error in a magnetization measuring method that measures the length of a magnetic long material based on a rotating body that is pressed against the magnetic long material and rotates while the magnetic long material moves. The amount of movement of the magnetic long material is detected from the rotation angle of the magnetic long material, and the amount of movement is compared with the amount of movement of the magnetic long material detected based on the magnetization detection signal to detect a magnetization error, A method for determining a magnetization error, comprising determining. 2. A magnetizer and a magnetic flux detector installed at a predetermined distance along a traveling direction of a long magnetic material repeat magnetization and detection of a magnetization point, and detect magnetization. A magnetizing error discrimination device used in a magnetometer method for measuring the length of a magnetic long material based on a signal, wherein the rotating body is pressed against the magnetic long material and rotates, and is connected to the rotating body. A rotation angle detector, a signal converter that converts the detected rotation angle into an electric signal, a signal from the signal converter, and a magnetization detection signal generated by detecting a magnetization point are input, A magnetization error discriminating device comprising a magnetization error discriminator for detecting and discriminating a magnetization error based on both signals. 3. An indicator for displaying an abnormal magnetization error based on an output from a magnetization error discriminator issued when an abnormal magnetization error is detected, and an output device for stopping the movement of the magnetic long material. 3. The magnetizing error determination device according to claim 2, comprising: