I. Appearance and Structural Inspection
1. Housing Integrity: Carefully inspect the housing for cracks, deformation, damage, or severe corrosion. Minor corrosion should be removed promptly and repainted for protection; severe corrosion requires replacement of the affected parts.
2. Explosion-proof Joints: Check the gaps, widths, and surface roughness of the explosion-proof joints to ensure they are within allowable tolerances. Any wear exceeding tolerances may cause explosion-proof performance failure.
3. Transparent Window: Inspect the transparent window made of high-strength tempered glass or special plastic for scratches, cracks, or damage to ensure clear imaging and impact resistance.
II. Sealing Inspection
1. Cable Inlet Seal: Check the rubber sealing ring at the cable inlet for integrity. It is strictly forbidden to use sealing putty, asbestos rope, or other methods as substitutes. Oil stains on the sealing ring should be wiped clean to prevent aging and deterioration.
2. Cavity Seal: It is strictly forbidden to fill the cavity with any substance, as this will compromise the explosion-proof performance. All inlet and outlet gaskets and metal washers must maintain their factory-sealed condition, and the compression nuts must be tightened to seal the inlet.
3. Protection Rating Verification: For IP68 rated equipment, a 30-minute immersion test at 1 meter underwater can be performed to verify sealing performance.
III. Fastener and Internal Support Inspection
1. Fastener Condition: Check all bolts and nuts for looseness. Loose fasteners must be tightened immediately. Arbitrary replacement or missing fasteners is strictly prohibited.
2. Internal Support Frame: Check the internal support frame for sturdiness to prevent loosening or damage to internal components due to impact.
IV. Electrical Performance and Safety Inspection
1. Grounding System: The grounding connection of the explosion-proof equipment must be carefully inspected weekly to confirm its stability and check for breaks, corrosion, or other defects in the grounding wire. Grounding resistance should be measured regularly to ensure it meets requirements, generally not exceeding 10Ω.
2. Insulation Performance: Monthly insulation resistance tests should be conducted using an insulation resistance tester to ensure the equipment's insulation performance is in good condition.
V. Functional and Operational Status Inspection
1. Start-up and Operation: Each time the equipment is started, observe whether the start-up is normal and whether there are any abnormal sounds, vibrations, or overheating during operation. If any abnormality is found, the machine should be stopped immediately for inspection.
2. Ventilation and Heat Dissipation: Check whether the ventilation openings are unobstructed, whether the ventilation fan is operating normally, and whether the heat sink is free of dust or blockages.
VI. Periodic Inspection and Professional Verification
1. Periodic Inspection: It is recommended to regularly commission a professional testing agency to conduct a systematic safety assessment, including appearance and structural inspection, electrical parameter testing, protection level verification, and temperature group confirmation.
2. Professional Testing: For critical components, impact resistance tests (such as free fall, pendulum impact) and static pressure tests (applying 1.5 times the reference pressure for 10 minutes without structural failure) can be performed.
