When using a lever chain crane, it is necessary to strictly follow the following systematic precautions, covering the five core dimensions of equipment inspection, operation specifications, environmental adaptation, maintenance, and emergency management, and comply with national standards such as GB/T 20776-2023 and TSG 51-2023:

1、 Comprehensive inspection before operation

Equipment body inspection

Confirm that the chain has no broken joints, cracks, or severe corrosion (wire breakage rate ≤ 10%), the hook has no deformation or cracks (opening degree ≤ 15% of the original size), the brake clearance is normal and there is no oil leakage, and the pulley system rotates flexibly without jamming.

Check the quality of track laying: track spacing deviation ≤ 10mm, elevation difference ≤ 5mm, straightness ≤ 3mm/10m, fixed pressure plate firmly without looseness, avoiding the risk of rail gnawing.

Verify the effectiveness of safety devices: Overload limiters, limiters, anti fall devices, layer door interlocks, etc. need to be regularly tested to ensure sensitive and reliable action.

Environmental adaptability inspection

Temperature/humidity: Ensure an ambient temperature of 0-40 ℃ and a relative humidity of ≤ 50% (40 ℃) or ≤ 90% (20 ℃); High temperature environments require the use of H-grade insulated motors, while low-temperature environments are equipped with heaters or low-temperature lubricating grease.

Dust/Corrosion: High dust environments require protection of IP5X or higher. Stainless steel or nickel plated alloy components should be selected for corrosive environments to avoid galvanic corrosion.

Vibration/Shock: In areas with frequent vibrations, shock-absorbing brackets, elastic connections, or seismic components should be used to avoid loose contacts or structural fatigue.

2、 Standardize operational procedures

Personnel qualifications and behavior

Operators must hold certificates and receive regular safety training and emergency drills; Unauthorized personnel are prohibited from operating or commanding, and it is strictly prohibited to use diagonal braces, overload operations, or lift when the signal is unclear.

Strictly implement the "Ten No Lifting" principle: Do not lift if overloaded, if the signal is unclear, if the binding is not secure, if there is someone on the lifted object, if the safety device is ineffective, if the edge of the heavy object is sharp and unprotected, if the buried object is not lifted, if the light is dark and the line of sight is unclear, if the sharp object is not cushioned, and if the weather is bad, do not lift.

Homework process control

Before lifting, confirm that the lifting equipment is fixed and the weight is balanced to avoid load eccentricity; Slowly accelerate during lifting to avoid sudden start causing impact; Maintain a constant speed while walking and avoid sudden stops and starts.

The drive motors on both sides need to be synchronously controlled by installing synchronizers or using PLC variable frequency speed regulation+encoder feedback system to ensure consistent walking speed and prevent deviation.

Set up a warning zone in the work area, and prohibit unrelated personnel from entering; During high-altitude operations, operators must wear safety helmets, safety belts, and install anti fall devices.

3、 Environmental adaptation and protection

Ground and Road Management

Ensure that the roadbed is flat and solid, without accumulated water, mud, or open or hidden ditches; Soft ground needs to be paved with steel plates or reinforced with roadbeds to prevent sinking or slipping.

Drainage ditches shall be set up on both sides of the track to prevent water accumulation from corroding the track or affecting the stability of walking.

Climate and weather response

Strengthen heat dissipation management during high temperature weather and regularly clean the radiator; Use low-temperature lubricating grease in low-temperature weather to avoid component jamming.

Stop outdoor work when wind speed exceeds level 6 to prevent wind pressure from causing deflection or overturning; Strengthen electrical system waterproofing on rainy and foggy days to avoid short circuits or electrical leakage.

4、 Maintenance and Inspection

routine maintenance

Daily inspection of chain lubrication status, brake clearance, and hook opening degree; Lubricate rotating parts weekly and check the insulation of the electrical system monthly.

Regularly clean dust and oil stains to prevent contamination from entering and causing poor contact or corrosion; Increase cleaning frequency in high dust environments.

Regular testing and calibration

Quarterly inspection of metal structure cracks (such as welds, connecting bolts) and track deviations; Conduct comprehensive testing every year, including non-destructive testing and load testing.

Timely replace worn parts (such as broken steel wire ropes, cracked hooks, and stuck chains) to avoid working with defects; The deformation of metal structures needs to be corrected or replaced in a timely manner.

5、 Emergency Management and Accident Handling

emergency measures

Equip with first aid kits, fire extinguishers, emergency lighting and other equipment; Develop emergency plans, including procedures for handling broken ropes, rescuing trapped personnel, and handling equipment overturning.

Regularly organize emergency drills to ensure that operators are familiar with emergency procedures and can quickly respond to and handle unexpected events.

accident handling

Immediately stop work in case of an accident, protect the scene and report to relevant departments; Cooperate with accident investigation, analyze the causes and take improvement measures to prevent similar accidents from happening again.

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