Starting an explosion-proof electric hoist requires strict adherence to safety precautions to ensure safe operation. Below are the key precautions:

1. Pre-Start Inspections

Environmental Check:

Ensure the workspace is clear of obstacles and that the operating area meets explosion-proof requirements (e.g., gas/dust concentration below 25% LEL).

Confirm the working environment temperature is within -20°C to 40°C, relative humidity ≤85%, and altitude ≤1000m.

Equipment Inspection:

Check the integrity of the explosion-proof enclosure, cables, and connectors for damage or loose connections.

Verify that safety devices (e.g., overload limiters, emergency stops) are functional.

Inspect the hook, wire rope, and limit switches for wear or damage.

Ensure the power supply voltage meets requirements (e.g., 380V ±20V).

2. Operational Precautions

Load Handling:

Never exceed the rated load capacity. Perform a trial lift with the load slightly off the ground to ensure stability before full operation.

Avoid side loading or using the hoist as a horizontal pulling tool.

Operator Qualifications:

Only trained personnel with a valid explosion-proof operation certificate should operate the hoist.

Operators must wear appropriate PPE (e.g., safety helmets, gloves, safety shoes).

Prohibited Actions:

Do not leave suspended loads unattended.

Avoid sudden starts/stops to prevent mechanical shock.

Never modify or bypass safety devices (e.g., limit switches).

3. Electrical and Mechanical Checks

Power Supply:

Use explosion-proof power sockets and ensure the power line is properly grounded.

Check for any signs of electrical leakage or loose connections.

Mechanical Components:

Ensure the wire rope is properly lubricated and free of visible broken strands.

Verify that the brake system is functioning correctly (brake slip distance S≤

100

V

, where V is the lifting speed in m/min).

Check that the limit switches are sensitive and reliable.

4. Safety During Operation

Avoiding Collisions:

Ensure the load does not collide with obstacles or the hoist structure during lifting.

When multiple hoists operate on the same track, install anti-collision buffers.

Prohibition of Dangerous Operations:

Do not tilt the load or use the hoist for horizontal dragging.

Never suspend a load in the air for extended periods to prevent permanent deformation of components.

5. Post-Operation Procedures

Shutdown:

Park the hoist in a designated area with the hook raised ≥2 m above ground.

Turn off the main power supply and lock the control panel.

Cleaning and Maintenance:

Remove dust, debris, and corrosive substances from the hoist.

Lubricate moving parts (e.g., chains, gears) with explosion-proof-compatible grease.

Record-Keeping:

Document all inspections, maintenance, and repairs for traceability.

6. Emergency Response

Fault Handling:

Immediately stop operation if abnormal noise, vibration, or overheating is detected.

Do not restart until the issue is resolved by qualified personnel.

Accident Protocols:

Operators must be familiar with evacuation routes and emergency shutdown procedures.

Report incidents promptly and cooperate with investigations.

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