Summary of Common Faults of Explosion-Proof Manual Hoist Trolleys

Explosion-proof manual hoist trolleys are critical equipment in hazardous environments, but they can experience several faults during operation. Here’s a summary of the common faults and their causes:

1. Starting Issues

Motor Does Not Start:

Overloading: Exceeding the rated load capacity.

Low Voltage: Voltage drop below 10% of the rated value.

Electrical Faults: Broken wires, poor contacts, or faulty control components.

Brake Locking: Brake wheel or rear cover rusted and stuck.

Motor Sweep: Internal motor damage causing the rotor to rub against the stator.

2. Braking Problems

Unreliable Braking:

Worn Brake Rings: Excessive wear leading to reduced braking force.

Oil Contamination: Brake surfaces contaminated with oil or grease.

Fatigued Springs: Pressure springs losing tension.

Loose Couplings: Misalignment or wear in coupling components.

3. Electrical Faults

Control Circuit Issues:

Broken Wires: Damaged or loose wiring in the control circuit.

Faulty Contactors: Burnt or stuck contactor contacts.

Grounding Issues: Improper grounding causing electrical leakage.

Insulation Damage: Worn insulation on motors or control boxes.

4. Mechanical Failures

Excessive Noise in Reducer:

Poor Lubrication: Insufficient grease or oil in the gearbox.

Worn Gears: Excessive tooth wear or damage.

Bearing Failure: Damaged bearings causing vibration.

Chain or Gear Jamming:

Rust or Corrosion: Accumulation of rust on chains or gears.

Misalignment: Improper installation leading to binding.

5. Buffer Faults

Oil Leakage:

Damaged Seals: Aging or damaged oil seals.

Slippage:

Worn Friction Plates: Excessive wear on friction components.

Failure:

Aging Parts: Exceeding the service life of internal components.

6. Operational Faults

Inability to Stop:

Welded Contactor Contacts: Contactor contacts fused together.

Faulty Limit Switches: Malfunctioning or misadjusted limit switches.

Overheating:

Overloading: Continuous operation beyond rated capacity.

Insufficient Cooling: Inadequate ventilation or overheating due to frequent use.

7. Structural Issues

Cracks or Deformation:

Welding Defects: Poor-quality welds leading to structural weakness.

Material Fatigue: Prolonged use causing metal fatigue.

Corrosion:

Surface Rust: Exposure to moisture or chemicals without proper protection.

8. Handling and Usage Errors

Improper Loading:

Side Loading: Lifting loads at an angle, causing stress on components.

Exceeding Limits: Operating beyond the trolley’s rated capacity or height.

The main equipment produced by Hebei Makita: stage electric hoist, electric chian hoist, wire rope electric hoist，Hand chain hoist, lever hoist, pneumatic hoist and other lifting equipment