When using a marine (or universal) manual hoist for lifting operations, strict control is required from four aspects: pre operation preparation, lifting process control, environmental adaptability, and emergency response to ensure safety and prevent equipment damage. The following are specific precautions:

1、 Preparation before operation

Equipment inspection

Appearance inspection: Confirm that the shell of the manual hoist has no cracks or deformations, the opening size of the hook meets the standard (opening degree ≤ 15% of the original size), and the chain is not twisted, tangled, or broken.

Braking test: Slowly lift under no-load condition to check if the brake can be reliably locked at any height without any sliding phenomenon.

Lubrication inspection: The lubricating oil for moving parts such as gearboxes and chains is sufficient and there is no dryness or leakage.

Overload protection: Confirm whether the equipment is equipped with overload limiting devices (such as mechanical limiters) and test their sensitivity.

Load assessment

Weight verification: Weigh or estimate the load weight before use to ensure that it does not exceed the rated load of the manual hoist (usually 0.5-20 tons).

Center of gravity confirmation: The center of gravity of the load should be located directly below the hook to avoid tilting the equipment or uneven force on the chain caused by unbalanced load.

Binding and fixing: Use a dedicated sling or steel wire rope to bind the load, ensuring that the binding point is firm and preventing slippage.

Environmental Assessment

Space confirmation: Check that there are no obstacles (such as pipes or beams) above the lifting path, and that there are no personnel or vulnerable items below.

Ground conditions: Ensure that the lifting points (such as decks, beams, and columns) have sufficient load-bearing capacity and are not loose or corroded.

Weather factors: in strong wind, rainstorm or high temperature environment, protective measures should be taken (such as strengthening load, suspending operation).

2、 Lifting process control

Lifting operation

Uniform and slow speed: The handle operation should be smooth, avoiding sudden pulling and releasing, and reducing the impact load of the chain.

Vertical lifting: Keep the angle between the chain and the vertical direction ≤ 30 ° to prevent lateral tension from causing equipment to be biased or gears to get stuck.

Height limit: When the lifting height approaches the upper limit, slow down to avoid chain stacking or exceeding the safe range.

Mobile and Positioning

Horizontal movement: If lateral movement of the load is required, pulley blocks or traction equipment should be used, and manual hoists should not be directly subjected to horizontal tension.

Accurate positioning: Slowly operate during descent to ensure the load is accurately placed at the target position and avoid collisions.

Load monitoring

Abnormal sound: If you hear abnormal noises such as gear jamming or chain friction during the lifting process, immediately stop the operation and check.

Chain status: Observe whether the chain jumps or gets stuck, and adjust the load position or rebind it in a timely manner.

Braking reliability: Test whether the brake can remain locked for a long time without any downward trend in the load hovering state.

3、 Environmental adaptability adjustment

Special working conditions for ships

Anti corrosion measures: After working in seawater environment, rinse the surface salt of the equipment with fresh water, wipe dry and apply rust proof oil.

Vibration isolation: When the ship shakes violently, fix the manual hoist on the shock absorber bracket to reduce the impact of vibration on the components.

Temperature control: Before sailing in cold regions, preheat the gearbox to prevent lubricating oil from solidifying and causing operational delays.

Space restriction handling

Narrow space operation: In restricted areas such as cabins, use extended handles or remote control devices to prevent operators from entering dangerous areas with their body parts.

Multi device collaboration: If multiple manual hoists need to be used for joint lifting, unified command is required to ensure synchronous lifting/lowering of each device.

4、 Emergency response and subsequent operations

Emergency response to malfunctions

Chain breakage: Stop operation immediately and use spare lifting equipment to secure the load to prevent falling and injury.

Brake failure: Quickly reverse the handle and attempt to reduce the load speed through gear reverse braking, while calling for support.

Equipment stuck: Do not forcefully pull or tug. Check whether the gears and chains are stuck, clean up foreign objects, and then operate again.

Post homework maintenance

Load unloading: After placing the load completely on the ground, release the hook to avoid a suspended state.

Equipment return: Store the manual hoist in a dry and ventilated dedicated cabinet to avoid contact with corrosive substances.

Record filling: Fill in the operation log, record information such as load weight, operation time, equipment status, etc., for easy traceability in the future.

5、 Personnel safety requirements

personal protection

Operators are required to wear safety helmets, anti slip shoes, gloves, and goggles to prevent injuries from falling objects or chain projectiles from high altitude.

In the three-dimensional intersection operation area, a warning line should be set up and a dedicated person should be arranged for supervision.

Operation qualification

It is strictly prohibited for unlicensed personnel to operate manual hoists. Before operation, they must undergo professional training and pass the assessment.

Do not operate after fatigue or drinking alcohol to ensure that the operator is in good mental condition.

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