Magnetic Coil Flaw Detector 300mm Open-Close Type

The open-close type coil magnetic particle flaw detector makes it easier for the workpiece to enter the coil.

Main Parameter

Function introduction

1. Magnetization - start the electromagnetic field to magnetize the workpiece;

2. Demagnetization - demagnetization field starts to demagnetize the workpiece;

3. Over temperature alarm - the coil has a built-in 75 ℃ temperature sensor. When the set temperature is exceeded, it enters the protection state;

Installation and commissioning

Installation:

1. The equipment shall be installed in a dry environment without metal dust, corrosive gas and inflammable and explosive articles;

2. The temperature of surrounding medium shall not be lower than - 10 ℃ and not higher than + 40 ℃;

3. The relative humidity of the air shall not be greater than 85%;

4. The pipe and wire connection between the installation equipment and each auxiliary facility shall be connected according to the indication sign and plug base;

5. Power supply (power supply, air source, etc., according to equipment installation environment and operation conditions), and the equipment shell is reliably grounded;

Commissioning:

1. After the equipment is installed in place, first check whether all connecting wires and fastening screws are loose and fall off;

2. Use instruments to measure whether the voltage at the upper end of the main switch of the machine meets the requirements of equipment installation environment and operation conditions;

3. Check each function action, manually press or toggle each function switch, and each function action of the equipment shall be executed accordingly;

4. Demagnetization effect inspection: check whether the residual magnetism after demagnetization meets the requirements;

5. After passing the commissioning and inspection, the equipment can be put into production.

Routine maintenance

After the equipment is used, the following operations must be carried out:

1. Turn off the power switch and cut off the power supply of the equipment;

2. Cut off the main switch of external power supply;

3. Clean up the oil stain on the coil surface and keep the whole equipment clean;

4. Check the circuit connecting line, cable and fastener for looseness and aging within one month;

5. Check whether the concentration of magnetic suspension meets the standard every day;

6. Neutral washing must be used to clean the oil stain on the surface of the equipment;

7. If the shell is damaged, it is forbidden to continue to use;

Flaw detection principle

Principles of electromagnetism

The magnetizing current forms an electromagnetic field through the surface of ferromagnetic workpiece (AC and half wave DC have skin effect). The existence of defects will cut off the magnetic line of force, form a leakage magnetic field and adsorb magnetic particles. Magnetic particles accumulate to form magnetic marks. The existence of defects can be judged by observing magnetic marks (magnetic marks are actually enlarged defects).

Longitudinal magnetization method

That is, using the coil method, the workpiece is threaded into the coil or placed between the magnetic yoke composed of two coils. When current is applied to the coil, the longitudinal magnetic field is generated in the coil and passes along the long axis of the workpiece to check the circumferential crack.