To prevent fatigue and damage to the explosion-proof pneumatic hoist chain, comprehensive measures need to be taken from six aspects: material selection, installation specifications, usage environment, operation specifications, maintenance, and personnel training. The specific measures are as follows:

1、 Material selection and quality control

Select materials based on working conditions

The material of the chain needs to adapt to the characteristics of the working environment. For example, in corrosive environments such as chemical and offshore platforms, stainless steel or galvanized chains should be selected to avoid stress concentration and fatigue cracks caused by corrosion in ordinary carbon steel.

Strict quality inspection

When purchasing, suppliers are required to provide material testing reports to ensure that the chain meets key parameter standards such as tensile strength and hardness. For example, explosion-proof pneumatic hoist chains need to pass explosion-proof certification to avoid sparks caused by material defects.

2、 Installation specifications and initial state

Avoid installation errors

When installing the chain, it should be kept horizontal to prevent lateral movement or twisting, otherwise it may cause local stress concentration. For example, if the chain and sprocket do not mesh properly, additional friction will be generated during operation, accelerating fatigue.

Adjust the initial tension

The tension of the chain should be controlled within 1% -3% of the span. Insufficient tension can lead to excessive bending of the chain, increasing wear and tear; Excessive tension may cause plastic deformation and reduce fatigue life.

3、 Use environmental control

Temperature range management

The working temperature of the chain should be maintained between -20 ℃ and+120 ℃. In high temperature environments, chains are prone to relaxation and deformation; Low temperature may lead to material embrittlement and increase the risk of fracture.

Anti corrosion measures

In humid or chemically corrosive environments, the chain needs to be regularly oiled or coated. For example, in high humidity scenarios such as coal mines, the use of rust proof grease can significantly extend the life of the chain.

4、 Operating standards and load management

Avoid impact loads

Sudden lifting or emergency stop can generate impact force, causing a sudden increase in chain stress. During operation, start and brake smoothly to reduce dynamic load fluctuations.

Overloading operation is strictly prohibited

Overloading is one of the main causes of chain breakage. Chain specifications should be selected based on the rated load of the hoist, and the maximum load should be prominently marked to prevent accidental operation.

Optimize the lifting angle

Maintain vertical lifting and avoid side pulling or diagonal lifting. When lifting diagonally, the chain needs to bear additional force, which can easily lead to local overload and fatigue damage.

5、 Maintenance and troubleshooting

Regular lubrication and cleaning

Clean and lubricate the chain every 1-3 months based on usage frequency. Use specialized lubricants (such as molybdenum disulfide based grease) to reduce hinge wear and bonding risks.

Appearance inspection and replacement

Check the chain daily for cracks, deformation, or excessive wear. If the following situations are found, they need to be replaced immediately:

Chain elongation exceeds 3% of the original length;

Fatigue striations (small cracks) appear on the surface;

The hinge part is stuck or not rotating flexibly.

Explosion proof special maintenance

Regularly check the sealing of explosion-proof components (such as motors and pneumatic components) to prevent flammable gases from entering and causing explosions. At the same time, clean the oil and dust on the surface of the chain to avoid friction and heat generation.

6、 Personnel training and safety awareness

Operational skills training

Train operators on chain maintenance, load calculation, and emergency response. For example, simulating chain breakage scenarios, training the ability to quickly shut down and isolate hazardous areas.

Implementation of safety regulations

Establish a chain usage file to record each inspection, lubrication, and replacement. Establish a reward and punishment mechanism, punish violations such as overloading and inclined lifting, and strengthen safety awareness.

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