Explosion proof Manual Hoist Trolley is prone to damage under specific working conditions due to environmental, operational, or maintenance factors. The following are three typical risk scenarios and failure mechanism analyses:

1. Corrosive environment: Material failure caused by chemical attack

Scene description:

In chemical industrial areas, laboratories, or coastal operations, equipment is exposed to acidic gases (such as HCl), alkaline solutions (such as NaOH), or salt spray for a long time.

Damage mode:

Chain corrosion: Ordinary carbon steel chains may experience pitting corrosion after 3 months in a salt spray environment, and may fracture when the cross-sectional area decreases by more than 15%.

Brake failure: The copper alloy brake band is corroded, causing grooves and a decrease in friction coefficient of more than 40%.

Corrosion of explosion-proof surface: Stainless steel frame in contact with chloride ions may cause intergranular corrosion and failure of explosion-proof gaps.

Preventive measures:

Upgraded material: Use 316L stainless steel chain+tungsten carbide coating, and replace the brake band with PTFE impregnated copper based material.

Protection design: Add PVC protective cover, rinse and spray anti rust wax after operation.

2. Overload impact: Structural fatigue caused by dynamic loads

Scene description:

Frequently lifting objects that exceed 10% of their rated load (such as unsecured shaking equipment), or suddenly releasing loads (such as brakes not fully locked).

Damage mode:

Chain fatigue fracture: When overloaded, the chain is subjected to impact loads, resulting in microcracks at stress concentration points (such as welding points).

Gear tooth breakage: Copper alloy gears undergo plastic deformation and tooth surface peeling under instantaneous overload.

Frame deformation: Overloading causes the main beam to deflect more than L/500 (L is the span), affecting operational stability.

Preventive measures:

Install load sensors, trigger sound and light alarms and mechanically lock when overloaded.

Operator training: Implement the "three inspection system" (check the load status before, during, and after lifting).

3. Lack of lubrication: abnormal wear of the friction pair

Scene description:

Continuous operation in high temperature (>60 ℃) or high dust environment without adding lubricating grease according to the prescribed cycle (such as every 8 hours).

Damage mode:

Chain wear: Insufficient lubrication leads to direct contact between the pin shaft and the sleeve, resulting in an increase in clearance of more than 5% of the original size.

Bearing jamming: When deep groove ball bearings lack lubrication, the operating resistance increases by 3-5 times and the temperature skyrockets by more than 120 ℃.

Brake failure: Dry friction causes the wear rate of the brake band to accelerate by 10 times, requiring replacement after 300 operations.

Preventive measures:

Adopting an automatic lubrication system, the oil supply is automatically adjusted according to the ambient temperature.

Monitoring technology: Deploy vibration sensors to trigger maintenance alerts when abnormal vibrations occur.

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