The protective measures for a lever hoist need to run through its entire lifecycle, covering four dimensions: pre operation inspection, operation standardization, maintenance, and emergency response. The following is a systematic exposition from four aspects: safety design principles, key points of operation and protection, maintenance standards, and emergency management measures. Combining industry standards and typical cases, measures are ensured to be scientifically effective:

1、 Safety design principle: intrinsic safety protection

Overload protection device

Equipped with mechanical or electronic overload limiters that automatically lock when the load exceeds the rated value, preventing chain breakage or structural damage. For example, industrial grade lever hoists often adopt a dual pawl design, where the pawl automatically locks into the ratchet teeth slot when overloaded, preventing further lifting.

Fall prevention and anti slip design

The hook adopts a self-locking design (such as a safety lock buckle) to prevent accidental detachment of the load; The chain guide adopts wear-resistant materials to reduce friction losses; The braking system adopts a dual braking design (such as spring braking+hydraulic buffering) to ensure stable suspension of the load in a stationary state or emergency situation.

Ergonomic optimization

The length and grip design of the lever handle conform to ergonomics, reducing operational fatigue; Install anti slip rubber sleeve at the end of the handle to prevent slipping; Control switches (such as pawl direction switching) are marked prominently (red/green/yellow) for quick identification of operating status.

2、 Key points of operation protection: standardize the operation process

Pre operation checklist

Appearance inspection: Confirm that the chain has no cracks, twists, corrosion, or excessive wear (the wear amount of the chain ring diameter is ≤ 10%); The hook has no deformation, cracks or welding defects; The lever handle is not bent or cracked; The brake system responds sensitively without any jamming phenomenon.

Functional testing: Conduct no-load operation to test whether the ratchet pawl system is smooth and whether the braking is reliable; During load testing, gradually load to 50% and 100% of the rated load and observe for any abnormal sounds or vibrations.

Environmental inspection: Ensure that the work area is free of obstacles and the ground is flat and solid; When working at heights, it is necessary to build a stable platform, wear safety belts, and connect to independent anchor points.

Standardized operation

Load control: Overloading is strictly prohibited. The load should be evenly distributed to avoid eccentric loads; Maintain a constant speed when ascending or descending, avoiding sudden acceleration or sudden stop.

Direction control: Adjust the pawl direction (lift/lower/neutral) according to the homework requirements. The neutral mode is only used to adjust the chain length and is prohibited from being used under load.

Personnel positioning: Operators should stand on the side of the lever handle to avoid facing the load or chain directly; Do not place any part of the body under a load or on the path of chain movement.

Collaborative operation: Clear command signals are required when multiple people are operating to avoid misoperation; Use walkie talkies or gesture signals to ensure smooth communication.

3、 Maintenance and upkeep standards: Extend equipment lifespan

routine maintenance

Cleaning and lubrication: Regularly clean the oil and dust on the chain, ratchet, and pawl; Apply specialized lubricating grease (such as lithium based grease) to the friction parts of the chain guide, ratchet teeth, and brake system to reduce wear.

Chain management: The chain should be kept moderately loose to avoid excessive stretching or looseness; When storing, the chain should be hung in a dry and ventilated place to avoid moisture or corrosion.

Regular professional maintenance

Annual inspection: Professional personnel conduct a comprehensive disassembly and inspection of the equipment, including internal components such as gearboxes, bearings, springs, etc; Replace parts with excessive wear and tear (such as chain links, claws, brake pads).

Non destructive testing: Using techniques such as magnetic particle testing and ultrasonic testing to detect internal defects in key components such as hooks and chains, ensuring no cracks or fatigue damage.

Certification and recording: After maintenance, a maintenance label should be affixed, indicating the maintenance date, maintenance personnel, and next maintenance time; Establish equipment archives to record the history of use, maintenance, and repair.

4、 Emergency Management Measures: Risk Response and Disposal

Emergency handling of faults

Chain stuck: Stop operation immediately and check if the chain is stuck by foreign objects or if the guide rail is deformed; Use specialized tools (such as chain wrenches) to slowly release the load and avoid forcefully pulling or pulling.

Brake failure: If the brake cannot lock the load, immediately activate the backup brake system (such as manual emergency brake valve); If the backup system fails, slowly reduce the load to the ground to avoid sudden drops.

Load falling: If the load accidentally falls, immediately evacuate the surrounding personnel and set up a warning area; Use backup equipment (such as a jack) to re lift the load and check the cause of equipment failure.

Emergency response for personnel injury

Pinch/compression injury: Stop operation immediately and call the emergency number; Perform preliminary treatment on the wound (such as hemostasis and bandaging) to avoid moving the injured person; If the injured person is trapped, professional rescue personnel need to use specialized tools to rescue them.

High altitude falling: Immediately activate the emergency plan for high-altitude falling and use buffering devices such as safety nets and air cushions; Conduct a preliminary examination of the injured person to confirm if there are any fractures, internal organ injuries, etc., and avoid moving them randomly.

Accident Report and Investigation

Immediately report to superiors and protect the accident scene after an accident occurs; Establish an accident investigation team to analyze the causes of accidents (such as equipment failures, operational errors, environmental factors, etc.), develop corrective measures, and prevent similar accidents from happening again.

5、 Industry norms and standards

International standards: Following ISO 4304-1 "Cranes - Wire Rope - Selection, Maintenance, and Use", OSHA 1926.1401 "Safety Standards for Cranes and Lifting Equipment", etc.

Domestic standards: follow GB/T 14736-2009 "lever type chain block", GB 6067.1-2010 "Safety regulations for lifting equipment", etc.

Manufacturer's Guide: Strictly follow the operation manual and maintenance manual provided by the equipment manufacturer, and regularly participate in training and certification organized by the manufacturer.

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