Magnetic portable magnetic particle flaw detection machine for electrical insulation performance detection

Inspection steps:

Including the inspection of the insulation resistance of the whole machine and the insulation strength of each circuit of the Su magnet portable magnetic particle inspection machine. We use the HY2675 insulation resistance tester to test the insulation resistance, according to the standard requirements to select the tester's range, turn on the power switch, at this time the instrument is in the working state, the meter shows the high voltage output test end connected to the measured object, at this time the tester should display a certain value. When testing insulation resistance, it must be gradually changed from low resistance to high resistance to ensure the accuracy of measurement. The insulation strength is tested by HY267 type voltage resistance tester, and the tester is adjusted to the corresponding range according to the test voltage, leakage current and test time of the tested object. Turn on the power and start the tester. Slowly turn the Voltage Adjustment knob in a clockwise direction. When the indicating value of the voltmeter reaches the set voltage value, if no excess leakage occurs within the set time, it indicates that the measured insulation strength meets the requirements. When the insulation strength of the measured product is not enough, the leakage current is greater than the set value, the output voltage is automatically cut off, and the "over-leakage" warning is issued, the buzzer is sounded, and the "over-leakage" indicator is lit. If it lasts for 1 minute without flare-up and breakdown, the requirements specified in the standard are met.

Three characteristics of portable magnetic particle flaw detection machine:

① Regulated power supply, cable coil roller, probe toolbox, various flaw detectors, powder distributor are installed on a special light trolley, which brings great convenience to the field flow flaw detection.

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② The compact and reasonable design of the light trolley machine is equipped with a shear type and flexible double shock absorber mechanism. The front and rear wheels are made of acid-resistant and oil-resistant high-strength nylon injection molding. Each wheel is embedded with two rolling bearings, three wheels are triangular, three bearing points, the center of gravity is stable and steering freely, flexible and light. The trolley frame, chassis and upper and lower plates are chrome plated and sprayed to make them both beautiful and durable.

(3) The machine is also equipped with imported high-strength resin molding probe toolbox, the box can be locked, easy to keep the inspection equipment in good condition.

Magnetic portable magnetic particle inspection machine common magnetization mode list

In the process of operation, the magnetization of the workpiece is still a more important part. Magnetization refers to the process of generating a magnetic field inside the workpiece under the action of an external magnetic field called the magnetization of the workpiece. There are many magnetization methods in the detection of magnetic particle flaw detection machine, and we can be divided into different categories according to different standards.

1, according to the use of current direct magnetization method and indirect magnetization method.

2, can be divided into circumferential magnetization method, longitudinal magnetization method, composite magnetization method, in these methods, the detection orientation of circumferential magnetization and the workpiece axial parallel defect direct conduction method, used for magnetic particle flaw detection machine on the rod or rod workpiece magnetization work.

3, according to the type of current used can be divided into direct current magnetization method, alternating current magnetization method.

Magnetization during the operation of the flaw detection machine:

1. Circumferential magnetization

Refers to the direct electricity to the workpiece, or the current through the central hole of the workpiece conductor, designed to establish a closed magnetic field in the workpiece around the workpiece and perpendicular to the axis of the workpiece, the magnetic field line has a closed shape. Circumferential magnetization is mainly used to find defects parallel to the workpiece, that is, defects parallel to the direction of the current.

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2. Longitudinal magnetization

Refers to the method of magnetizing the workpiece in a long direction by passing an electric current through the coil surrounding the workpiece, and the line of magnetic force in the workpiece is parallel to the axis line of the coil. It is mainly used to find defects attached vertically to the workpiece shaft. Magnetizing with an electromagnetic yoke so that the line of magnetic force is parallel to the longitudinal axis of the workpiece also belongs to this category.

3. Multi-directional magnetization

A magnetic field whose size and direction change with time in a circular, elliptical or helical shape is generated in the workpiece by composite magnetization. Because the direction of the magnetic field constantly changes on the workpiece, it is possible to check for defects in different directions.

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