How does the portable magnetic particle flaw detection machine classify the quality of different workpieces through pattern recognition? There are roughly four ways:

(1) Record and file detection:

It can provide inspection records up to defect images.

(2) High detection accuracy:

The high speed data acquisition, quantization, calculation and discrimination of analog signals have higher detection accuracy than that of traditional instruments.

(3) High reliability and good stability:

It can comprehensively and objectively collect and store data, and conduct real-time processing or post-processing of the collected data, analyze the signal in time domain, frequency domain or image, and also grade the quality of the workpiece through pattern recognition, reducing the influence of human factors and improving the reliability and stability of retrieval.

(4) Fast detection speed digital:

Generally, it can automatically detect, calculate and record, and some can automatically compensate the depth and automatically set the sensitivity, so the detection speed is fast and the efficiency is high.

Solutions for equipment power outages:

In this case, the first thing we have to check is the line, can not be troubled by this most simple problem, so for the circumference-powered no current inspection transformer connection cable, if loose or fall off, timely reconnection can be.

It is more common for the wire joint to fall off, because the temperature of the cable is relatively high after the power is energized, and when the work is cooled after the end, there is a situation of thermal expansion and contraction, and the loosening of the screw nut may occur.

The electrode shaft of the magnetic particle flaw detection machine is conductive to the workpiece clamping magnetization, and the copper plate on the end face of the two electrode shafts is to prevent the spark from burning the workpiece.

If the customer uses the aqueous magnetic suspension, the magnetic particle flaw detection machine is usually energized without current.

Multi-purpose magnetic particle flaw detector different ways of use

The multi-purpose magnetic particle flaw detector is a mobile magnetic flaw detector, which can carry out AC magnetization and automatic demagnetization of the detected part, and can be used for external magnetic flaw detection and residual magnetic flaw detection. Can be fixed in the workshop or laboratory, can also be carried to the inspection site for use; The various parts of the opposite sex can obtain appropriate magnetization; Large size parts can be partially magnetized. The instrument adopts logic circuit, equipped with phase controller, remanence stability, to ensure the quality of detection, automatic demagnetization can gradually decay from the magnetization current used to zero, so the remanence disappears, easy to operate, good performance.

1. Principle of magnetic particle detection After magnetization of ferromagnetic material parts, continuous magnetic field lines cause local deformation of magnetic field lines due to defects. When the discontinuity point is located on or near the workpiece surface, the local distortion of the magnetic field line will cause part of the magnetic field line to leak out of the workpiece surface and form a leakage magnetic field. Magnetic leakage attracts magnetic particles applied to the surface of the workpiece, forming a magnetic track visible to the naked eye under appropriate lighting, indicating discontinuities in position, shape, and size.

2. The design and manufacture of the detector comply with the testing standards and design principles of the basic J13/T8290-1998 Magnetic particle detector. The position, shape and size of extremely fine defects such as cracks and slag caused by workpiece surface and near surface, forging, quenching, grinding and fatigue can be detected by continuous testing method.

A few tips to reduce the heat of portable magnetic particle flaw detection machine

Source: | Release Date: 2021-09-09

Common steps for portable magnetic particle flaw detection machine to reduce motor heat release:

1. The rotating motor is equipped with a brake device to ensure that the hook tail frame can be accurately in place when rotating.

2, when the motor is in the power input, the coil and the coil of the brake are energized at the same time, at this time the magnet disc of the brake overcomes the spring pressure and is sucked to the side of the magnetic pole group, so that the friction sheet is separated from the brake plate and the motor can be started.

3, when the power is cut off, the magnet disc is pushed out by the spring due to the disappearance of the magnetic field, so that the friction plate on the magnet disc and the brake plate friction, and the motor is quickly braking.

4. Disassembly the brake, the brake skin attached to the magnet disc falls off, resulting in a longer braking distance, up to about 10mm, the electromagnetic suction becomes weak, the magnet disc can not be separated from the system plate, and the friction generates heat.

5, grinding brake disc on the grinder, adjust the brake pad clearance to 0.5mm, test, motor rotation, braking normal.

Quick way to distinguish false magnetic marks of flaw detection machine:

1, the concentration of magnetic powder suspension is too large or may cause unnecessary false magnetic marks, easy to identify, loose powder, the outline of the magnetic track is not clear, and the elimination of magnetic marks after rinsing.

2, the presence of oil, fiber material hair and dirt will adhere to magnetic powder and form magnetic marks. As long as a careful look can be found, and then by cleaning the workpiece profile can be eliminated.

3, the rough surface of the workpiece (such as the depression on both sides of the weld, rough machining and casting surface) will retain magnetic powder to form magnetic marks. The accumulation of very loose powder, the outline of the magnetic track is not clear, the workpiece can be kerosene or wet powder magnetic marking mark can be removed by rinsing.

4, the oxidation and rust of the workpiece profile and the retention of magnetic powder on the edge of the paint spots will form magnetic marks, and the magnetic marks are clearly identifiable after careful inspection.

5, scratches and knife marks: when the magnetizing current is too large, the powder will be absorbed from scratch, but there is no strong magnetic field repeatable.

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