HCDX-C400S 2000A Manual Locking Magnetic Particle Inspection Coil for Shaft/Disc Workpiece NDT

HCDX-C400S 2000A Manual Locking Magnetic Particle Inspection Coil for Shaft/Disc Workpiece NDT

1. Safety Precautions

1.1 Electrical Safety: The maximum working current of this coil is 2000A. Before operation, it is necessary to ensure that the power circuit complies with electrical safety standards and is reliably grounded; it is prohibited to use it in damp, flammable, or explosive environments to prevent the risk of electric shock or explosion.

1.2 Required Standby Load Rate: The standby load rate of the coil is 20%, meaning that the power-on time within every 10 minutes shall not exceed 2 minutes. It is strictly forbidden to use beyond the standby load rate to avoid overheating and burning of the coil.

1.3 Mechanical Operation: When operating the manual locking mechanism, force should be applied evenly to avoid violent pulling that may cause the coil to deform or the locking mechanism to fail; when opening or closing the coil, it is necessary to confirm that the workpiece is completely placed in position to prevent injury or damage to the workpiece.

1.4 Inspection Environment: During magnetic particle inspection, protective gloves and goggles should be worn to avoid contact of magnetic powder with the skin or entry into the eyes; the working area should be kept well-ventilated and the scattered magnetic powder should be promptly cleaned.

1.5 Emergency Handling: In case of overheating, smoke emission, or abnormal sounds of the coil, the power supply should be immediately cut off. After the coil cools down, the fault should be investigated. It is strictly prohibited to continue using it in the faulty state.

2. Product Overview

2.1 Product Application

This manual locking circular opening and closing coil is specifically designed for magnetic particle inspection. It generates a circumferential magnetic field to detect cracks, folds and other defects on the surface and near-surface of the workpiece. It is suitable for non-destructive testing of circular workpieces such as shafts and discs.

2.2 Technical Parameters

2.3 Structural Composition

It is mainly composed of four parts: the circular coil body, the manual locking device, the current connection terminals, and the insulating handle. The coil body is wrapped with high-strength insulating material around the conductive copper bars to ensure stable current conduction and reliable insulation. The manual locking device achieves the opening and locking of the coil through a snap-fit structure. The current connection terminals are made of copper, which reduces contact resistance. The insulating handle facilitates the safe operation of the coil opening and closing by the operator.

3. Operating Steps

3.1 Preparations before Startup

3.1.1 Inspect the appearance of the coil: Confirm that the insulation layer of the coil is undamaged, the locking device is not deformed, and the connection terminals are not oxidized. If any abnormalities are found, they must be repaired before use.

3.1.2 Connect the power supply: Connect the connection terminals of the coil to the output terminals of the magnetic particle flaw detector's power supply securely to ensure a firm connection and avoid poor contact that may cause current fluctuations.

3.1.3 Prepare the workpiece: Clean the oil stains, rust, and impurities on the surface of the workpiece to be inspected, ensuring that the surface of the workpiece is flat and dry to avoid affecting the magnetic particle adhesion effect.

3.2 Coil Opening and Locking

3.2.1 Unlocking: Grasp the insulated handle and pull up on the locking latch to place the coil in the open position. The opening angle should meet the requirements for placing the workpiece.

3.2.2 Placing the Workpiece: Place the workpiece to be inspected steadily at the center of the coil, ensuring that the axis of the workpiece coincides with the center of the coil. Avoid uneven magnetic field distribution that may affect the detection accuracy.

3.2.3 Locking: Slowly close the coil and, after confirming that the workpiece is not displaced, press down on the locking latch until you hear a "click" sound. Ensure that the coil is fully locked to prevent the coil from loosening during the inspection process.

3.3 Inspection Operation

3.3.1 Parameter Setting: Based on the material and size of the workpiece, set the current value (≤ 2000A) and the energization time (strictly following the ≤ 20% no-load rate requirement) on the magnetic particle inspection machine.

3.3.2 Applying Magnetic Powder: Turn on the magnetic powder spraying device and evenly spray the magnetic suspension liquid or dry powder magnetic particles onto the surface of the workpiece to ensure complete coverage of the magnetic powder.

3.3.3 Energization Inspection: Start the power supply of the inspection machine, energize the coil to generate a magnetic field, keep the energization time within the set value, observe the magnetic powder accumulation on the surface of the workpiece, and determine the location and size of the defect.

3.3.4 Power Off and Demagnetization: After the inspection is completed, first cut off the power supply of the coil, then perform demagnetization treatment on the workpiece to avoid residual magnetism affecting subsequent processing or use.

3.4 Shutdown Procedures

3.4.1 Turn off the power supply of the magnetic particle inspection machine and disconnect the connection between the coil and the power source.

3.4.2 Unlock the coil, remove the workpiece, and clean the residual magnetic powder on the surface of the coil.

3.4.3 Close and lock the coil, and place it in a dry and ventilated storage area.