The three typical cases of rapid damage to explosion-proof chain hoists and their causes are analyzed as follows:

1、 Overloading use: directly causing structural failure

Phenomenon: Abnormal increase in hand tension, chain breakage, hook deformation, or brake pad failure.

Cause:

The rated load of explosion-proof chain block is based on the strength design of copper alloy material. Overloading can cause chain link overload, gear tooth breakage, or excessive wear of brake pads.

For example, when an 80 level lifting chain is overloaded, the chain links may break due to metal fatigue, causing the heavy object to fall.

consequence:

Chain breakage can cause heavy objects to lose control, the hook to deform and possibly fall off, and the brake pad to fail, making it impossible to hover the load, all of which directly threaten operational safety.

Long term overloading can accelerate gear wear and shorten equipment lifespan.

Preventive measures:

Strictly follow the rated load and prohibit overloading.

Confirm the load weight before operation and conduct a no-load test before use.

2、 Improper operation: Violation accelerates wear and tear

Phenomenon: Chain twisting, jamming, or damage to transmission components.

Cause:

Diagonal pulling of heavy objects: The chain deviates from the centerline of the sprocket, causing poor operation and increasing the risk of friction and tooth jumping.

Lateral traction: Non vertical lifting causes the chain to bear lateral forces, leading to deformation or breakage.

Chain knot: Lifting the chain directly without straightening it out can cause jamming or component breakage.

Throwing equipment: Impact may damage the explosion-proof casing or internal gears, damaging the explosion-proof performance.

consequence:

Twisting the chain can jam the gears, causing a sudden increase in operating force and even breaking the chain.

Lateral traction may cause the hook to break and heavy objects to fall.

Preventive measures:

Ensure that the chain is suspended vertically and avoid diagonal or lateral pulling.

Before lifting, straighten out the chain and prohibit throwing or dropping the equipment.

Regularly check the wear of the hook and replace it immediately if it exceeds 10%.

3、 Lack of maintenance: environmental erosion and insufficient lubrication

Phenomenon: Corrosion of components, lubrication failure, or decreased explosion-proof performance.

Cause:

Damp environment: Moisture infiltration causes oxidation of copper alloy components, reducing strength.

Corrosive gases: Chemical substances corrode chains and gears, accelerating wear.

Insufficient lubrication: Failure to regularly apply explosion-proof grease increases friction and heat, which may cause sparks.

Improper storage: The dirty and humid environment causes equipment corrosion, affecting explosion-proof sealing.

consequence:

Corrosion will weaken the load-bearing capacity of the chain and increase the risk of breakage.

Insufficient lubrication may cause gear jamming and brake pad failure.

The decrease in explosion-proof performance may lead to explosion accidents.

Preventive measures:

Store in a dry and ventilated environment, avoiding contact with chemicals.

Regularly clean the equipment and apply explosion-proof grease.

Clean dust and oil stains after use, and apply rust proof grease.

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