Detailed Product Description
一、Summary：
MJD-1000 is suitable for the magnetic particle testing method. Inspection the different shapes of parts that is made by the ferromagnetic material.Can be found cracks, slag and various other minor defects in parts of the surface and near-surface because of the Casting, forging, hardening, grinding, fatigue and other reasons.
The equipment can communicate magnetization with each equipment parts and demagnetization automatically; can be used to do the flaw detection as a continous method and residual method; can be used fixed or carry to the field. With the correct method,such as the strut or winding method. Can make the special parts get the right magnetization. And can segment detection for large size parts.
The circuit adjust the size of magnetization and demagnetization current by adjusting the size of the thyristor operating angle. The communicate magnetization can control the power phase, make the residual magnetization estable. Using integrated circuit control, make the equipment safe and reliable. The equipment has small volume, light weight, easy to carry, easy to operate,etc.
二、Technical performance:
Magnetizing current: AC：0－1000A (RMS) continuously adjustable.
Repeat utilization rate: ≥20%.
Automatic demagnetization current: AC 1000－0A (RMS) continuously adjustable.
Demagnetization time: 5S.
The output cable: 2×70mm2×3M×2 soft copper core cable.
Power supply: 380V 50HZ±10% 20A.
Exterior size: 600（length）×420（width）×520（height）ｍｍ.
Weight: about 23Kg.
三、The main working principle of the circuit
The machine control circuit adopts integrated circuit output phase shift pulse, phase shifting pulse by the power amplifier to the main circuit of the parallel SCR trigger pole, in the phase of the conduction Angle of silicon controlled rectifier to adjust the size of magnetization and demagnetization current .
When the job selection switch "magnetization" position, the strut probe hand button or foot switch, indicator the light of the magnetization ,magnetization current output.
When need automatic demagnetization, make the work selector switch on the demagnetization gears position, the light of the demagnetization indicator, the strut probe hand button or foot switch, automatic equipment output attenuation alternating current, make the parts from big to small in the magnetic field decay to zero.
四、The characteristics of the structural
This equipment adopts high integrated circuit, a control module, big current controlled, adjustable, small volume, light weight, easy to maintenance.
Equipment power supply into line for a three core cable, 1, 2 feet for the power supply into line, zero line 3 foot, magnetizing current using copper platoon output method.
五、The installation conditions
The temperature of surrounding medium not less than 20 ° c also is not higher than + 40 ° c.
The air relative humidity is not more than 85%.
With a environment not a lot of dust and flammable or corrosive gas.
power supply connection according to each indicator and socket, corresponding wires used in this equipment.
output connected to the desired location, and make a good contact.
The equipment must be reliable and connect with grounding.
六、Trial operation
This equipment need to be used specialist, read the instructions before use.
Ac magnetization current indicator mounted on the panel, dc magnetization current indicator, power light work, power supply, power switch, fuse selection switch (the magnetization and demagnetization), magnetizing current adjust electric appliance, external switch socket, power input terminal and large output current copper platoon.Before work should connect input and output cables.
Actual operation order
1. Close the power switch, the power supply opening, the power indicator.
2. According to the needs of work, select the magnetization current (ac, dc), make the output cable connected to the output of the copper platoon corresponding .
3. According to the process need to adjust the size of the magnetizing current, good cable connection, press work and adjust potentiometer clockwise, from small to large magnetizing current regulation, indicating value of RMS ac magnetization current, dc magnetization current indicated value is twice the average.
4. Press the key magnetization parts and applying magnetic powder and magnetic suspension at the same time;(note: the magnetization time shall not exceed 5 seconds at a time, intermittent time for magnetization time for 3 to 5 times).
5. Observe the artifacts, check the magnetic mark.
6. Work will choose 'demagnetization gear, demagnetization indicator (yellow) on, press work key for demagnetization.
7. When stop using, disconnect the power supply.
七、The fault inspection and maintenance
Equipment failure maintenance personnel need to be familiar With the circuit and working principle of equipment performance and operation method.Not blindly changing parts. The Following are common troubleshooting methods:
1. close the power switch, indicator light is not bright, the whole machine without power supply, check the power cord, power switch and fuse.
2. close the power switch, an external switch is not connected, main circuit has been work, usually is an external switch bad or thyristor occurrence breakdown.
3. press the external switch, the main circuit without output,should check whether the strut probe contact fuse in the main circuit are in good condition, and peripheral components and power supply circuit double 17 v and double 7 v, if all are normal but still no output, the trigger circuit is damaged.
4. the power supply work, the output current is small, usually is the output cable poor contact or load.
5. failure to repair itself, please contact our service department.
八、The attachment
When leaving the factory, the attachment will be subject to the packing list.
