The installation precautions for chain hoists are centered around "safety first, standardized operation, and precise adaptation", running through three stages: pre installation inspection, installation process control, and post installation verification. The specific characteristics and key points are as follows:

1、 Pre installation inspection: comprehensive equipment and site assessment

Equipment integrity check

Verify the equipment model, rated load, factory certificate of conformity, and inspection report to ensure they match the job requirements.

Key inspection of core components: the lifting chain has no broken joints, cracks, or excessive wear; The hook has no deformation or cracks, and the safety tongue is flexible; The brake (ratchet+friction plate) has sensitive action and reliable self-locking; The sprocket and gear rotate flexibly without any jamming; The shell has no deformation or cracks and is well sealed.

Site adaptability assessment

The installation position should be stable and able to withstand the static and dynamic loads of the equipment and load. The bearing capacity of I-beams, crane tracks, or specialized supports needs to be verified through calculation to avoid overloading.

Environmental safety inspection: Avoid high voltage lines, flammable and explosive materials, corrosive gases or liquids; Ensure sufficient operating space and no obstacles; High altitude operations require the installation of protective devices such as safety nets and fall arresters.

2、 Installation process control: precise operation and standardized process

Structural Installation Specification

The installation direction of the chain should be consistent with the rotation direction of the sprocket to avoid twisting or jamming the chain; Double chain/multi chain design requires symmetrical distribution to ensure even load distribution.

The hook fixation requires the use of standard shackles or connecting rings, and the bolt tightening torque should comply with the specifications (such as GB/T 1243-2006) to prevent detachment; The anti slip device (such as safety tongue) needs to be adjusted to an effective position.

Brake adjustment: The clearance between the friction plates should be moderate (usually 0.5-1mm) to ensure sensitive braking and no drag; The depth of engagement between the ratchet and pawl is ≥ 3 teeth to prevent slipping.

Electrical and hydraulic systems (if applicable)

Electric/hydraulic models require inspection of motor wiring and hydraulic pipeline connections to ensure no electrical or oil leakage; The control button and remote control function normally, and the emergency stop device is effective.

Explosion proof scenarios require confirmation that the equipment's explosion-proof level (such as Ex d IIB T4) matches the on-site environment, and that there is no risk of electrical components generating sparks.

3、 Post installation verification: multi scenario testing and dynamic monitoring

no-load test

Manually pull the chain or start the motor to check if the transmission is smooth, without any abnormal noise or jamming; The brake should be able to reliably lock without slipping in the unloaded state.

Test the functions of the upper and lower limit switches and overload protection devices to ensure automatic shutdown when overloaded by 10% -15%, and cut off power when the limit switch is triggered at the limit position.

load testing

Gradually load to 50% and 100% of the rated load, check equipment deformation, temperature, noise and other parameters; When loaded to 125% of the rated load, the equipment should have no permanent deformation or functional failure.

Dynamic testing: Simulate actual work scenarios (such as lifting, lowering, hovering) to verify operational accuracy, stability, and the effectiveness of safety devices.

Long term monitoring and maintenance

After installation, it is necessary to regularly check the wear of the chain (if the diameter of the chain link decreases by ≥ 10%, it needs to be replaced), the performance of the brake, and the cracking of the hook (magnetic particle inspection); The lubrication system needs to be regularly replenished with lithium based grease to maintain good lubrication of transmission components.

Establish equipment files to record installation dates, inspection cycles, maintenance records, and operator information to ensure traceability.

4、 Safety regulations and personnel training

Operator qualification: Professional training and certification are required for the job, familiar with equipment performance, operating procedures, and emergency response measures (such as chain breakage, falling, etc.).

Safety protective equipment: Wear a safety helmet, gloves, and non slip shoes during operation; High altitude operations require wearing safety belts and using fall arresters.

Emergency plan: Develop emergency response procedures for equipment failures, personnel injuries, and other unexpected situations, and equip emergency supplies such as first aid kits and fire extinguishers.

5、 Special scenario adaptation and customization requirements

Explosion proof environment: The equipment must comply with explosion-proof standards (such as GB 3836), and electrical components should be designed with explosion-proof features to avoid sparks; Explosion proof signs must be installed in the installation area, and open flame operations are prohibited.

Narrow space: The equipment needs to be designed compactly to adapt to limited space; Ventilation, lighting, and personnel escape routes should be considered during installation.

High/low temperature environment: The equipment needs to withstand extreme temperatures (such as -20 ℃~150 ℃), and the lubricating grease and sealing materials need to be adapted to the temperature range to avoid hardening or failure.

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