JPH0736003B2 - Moving material flaw detector - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a flaw detector, and more particularly, to a flaw detector that detects a flaw in an inspection material such as a coil with a flaw detector and marks this defective portion. Regarding monitoring system.

(Prior Art) Reliable detection of flaws in long coil materials such as thin metal plates, pipes, and wire rods is important in assuring product quality. Auxiliary equipment is attached to the building to improve its sophistication.

For example, generally, as shown in FIG. 2, first, an uncoiler and a coiler are provided in the inspection line, and the inspection material 1 unwound from the uncoiler is straightened by the straightening machine 2 and wound by the coiler. The flaw sensor 4 of the instrument 3 detects a defect (defect) of the inspection material, and the flaw detector 3 outputs a defect signal for a defect of a set level or higher. Record this 5
To record. On the other hand, a length measuring device 6 is provided between the straightening machine 2 and the flaw sensor 4 to detect the length and speed of the inspection material, which are input to the control unit 7 and also control the defect signal of the flaw detector 3. Input to the department. The control unit 7 traces a predetermined portion in the length direction of the inspection material, and therefore when the defective portion reaches the marking device 8 on the downstream side of the flaw sensor, the marking device 8 is instructed to perform marking. The control unit 7
Instructs the buzzer 9 to issue an alarm according to the magnitude of the defect signal of the flaw detector 3 and the defect number counter 10 to count the number of defects. This information is chart-recorded over the entire length of the inspection material.

Further, some flaw detectors have a function of classifying inspection materials according to the size and number of defect signals.

(Problems to be Solved by the Invention) As described above, the location, size, and number of defects of the inspection material are detected by the detection and marking of the defects by the flaw detection device. Even if it is
In this flaw detection system, it is important to surely and clearly attach the defective portion display mark to the defective portion of the inspection material.

However, if the electrical circuit between the flaw detector and the marking device malfunctions or does not operate, the material to be inspected will not be marked even if the flaw detector outputs a defect detection signal. May be mistaken for good material.

Further, if the ink adhesion state of the mark portion becomes poor, the mark portion becomes unclear, and the location of the defective portion becomes unclear.

In such a case, it is determined as a good material despite the fact that there is a defect, and the reliability of product inspection is reduced.

The present invention eliminates the above-mentioned drawbacks of the prior art, and surely without causing a positional deviation in the defective portion detected by the flaw detector,
Moreover, it is an object of the present invention to provide a flaw detector monitoring system that guarantees clear marking.

(Means for Solving the Problems) In order to achieve the above object, the present invention, in short, not only utilizes the defect output signal of the flaw detection device for marking by the marking device, but also the defect mark portion added as a result. It is used for matching with the mark identification signal of the mark sensor for detecting the defect, and the position, length, sharpness, etc. of the defect mark of the inspection material are monitored and guaranteed by this matching.

The flaw detection device for a moving material according to the present invention is a flaw sensor that detects a flaw in a moving material to be inspected, and is arranged on the downstream side of the flaw sensor in the moving direction of the material to be inspected, and marks the material to be inspected. A marking device for attaching a mark, a mark sensor that is arranged on the downstream side of the marking device in the moving direction of the inspection material, detects a mark attached to the inspection material, and detects a defect by the defect sensor. A signal is input, and the time when the flaw detection site reaches the marking device is obtained based on the movement information of the inspection material, and at this time, the marking device is operated to mark the inspection material. A mark detection signal is output from the mark sensor when the flaw site reaches the arrangement position of the mark sensor based on the control means and the detection signal of the flaw and the movement information. And having a mark monitoring means for detecting whether or not.

Hereinafter, the present invention will be described in detail based on examples.

(Embodiment) FIG. 1 shows a flowchart of a flaw detector monitoring system according to an embodiment of the present invention.

In the figure, 1 is an inspection material, which is rewound from the uncoiler, is straightened by the straightening machine, is supplied in the direction of the arrow in the figure, and is wound up by the coiler, as in the line shown in FIG. As shown in FIG. 1, a length measuring device 6, a flaw sensor 4, a marking device 8 and a mark sensor 11 are sequentially installed on the downstream side of the straightening machine. A recorder is connected to the flaw detector 3.

The length measuring device 6 measures the transfer speed of the inspection material 1 to detect the transfer length, and its pulse signal is input to the control unit 7 and the monitoring device 12. On the other hand, the flaw of the inspection material 1 is detected by the flaw sensor 4, and when the flaw is equal to or higher than the level set by the flaw detector 3, a defect signal is input to the control unit 7 and the monitoring device 12.

In the control unit 7, the defect signal input from the flaw detector 3 is shifted by the pulse signal from the length measuring device 6 using a shift register, and the defective portion is moved by a distance L between the flaw sensor 4 and the marking device 8 to perform marking. Immediately before passing through the device 8, the marking device 8 is operated to instruct to mark a certain length.

In the monitoring device 12, the defect signal input from the flaw detector 3 is shifted by the pulse register from the length measuring device 6 using a shift register, and the defect signal is l ± with respect to the distance l between the flaw sensor 4 and the mark sensor 11. Position of α, for example, l-300mm
Mark sensor 1 while moving to the position of ~ l + 300mm
Turn on the function of 1. If a defect mark is detected during this distance in which the mark sensor 11 is operating, the marking device 8 operates in response to the defect signal and marks at a predetermined position and definition, and thus is determined to be normal. On the contrary, if the defective mark is not identified within this distance, it is determined that the position shift or the mark blurring of the marking has occurred due to the malfunction of the control unit 7 or the marking device 8, and the monitoring device 12 determines this inspection line. Command to stop immediately.

A buzzer and a defect number counter can be connected to the control unit 7 as in the conventional case.

Further, in the above embodiment, the case where the inspection material is a coil such as a thin metal plate, a wire rod or a pipe has been described, but it goes without saying that the invention can be applied to the case where the inspection material is not a coil material such as a thick metal plate. However, in the latter case, it is relatively easy to find the defective portion based on the chart recording even if a problem occurs in marking, but in the former case, such work is substantially impossible. The effect of the present invention is remarkable.

(Effects of the Invention) As described in detail above, according to the present invention, with respect to the defect of the inspection material, the defect signal of the flaw detector and the mark by the mark sensor of the defect mark portion attached to the inspection material by the marking device. Since the identification signal is constantly collated, it can be confirmed whether or not the defect mark portion is clearly marked according to the position and length of the defect, and therefore the reliability of the flaw-tested inspection material can be improved.

[Brief description of drawings]

FIG. 1 is a flow chart of a flaw detector monitoring system according to an embodiment of the present invention, and FIG. 2 is a flow chart of a conventional flaw detector. 1 ... Inspection material, 2 ... Straightener, 3 ... Flaw detector, 4 ... Defect sensor, 5 ... Recorder, 6 ... Length measuring device, 7 ... Control unit, 8 ... Marking device, 9 …… Buzzer, 10 …… Defect number counter, 11 …… Mark sensor, 12 …… Monitoring device.

Claims (1)

[Claims] 1. A flaw sensor for detecting flaws in a moving material to be inspected, and a marking device arranged on the downstream side of the flaw sensor in the moving direction of the material to be inspected and for marking the material to be inspected. , A mark sensor that is arranged on the downstream side of the marking device in the moving direction of the inspected material and detects the mark attached to the inspected material, and a flaw detection signal by the flaw sensor is input, Based on the movement information of the inspection material, the time point at which the detected part of the defect reaches the marking device is determined, and at this time, the marking device is operated to put a mark on the material to be inspected, and the defect A marker for detecting whether or not a mark detection signal is output from the mark sensor when the flaw portion reaches the position where the mark sensor is arranged, based on the detection signal and the movement information. Flaw detection apparatus for a mobile material characterized by having a click monitoring means.