When starting the lever chain hoist, it is necessary to strictly follow the systematic safety inspection process and operating specifications. The following details key precautions from five aspects: equipment status verification, environmental risk assessment, load preparation, operation start-up steps, and emergency measures:

1、 Equipment status verification (core check before startup)

Integrity inspection of chains and hooks

The chain should be free of knots, broken joints, cracks, or excessive wear (if the diameter wear of the chain link is greater than 10% and the pitch elongation is greater than 3%, it should be scrapped); When the wear of the dangerous section of the hook exceeds 10%, the opening degree increases by more than 15%, or the torsional deformation exceeds 10 °, it must be replaced.

The chain should be smoothly threaded along the pulley/sprocket path, with the bottom hook hanging naturally without crossing or knotting; The bracelet has no slipping or falling phenomenon, and the rotation direction is consistent with the sprocket groove.

Reliability verification of braking system

The wear of the brake friction plate is ≤ 25%, and there is no oil or foreign matter affecting the braking effect; The main spring is not loose or broken, and the locking nut is tightened; Adjust the brake clearance to 0.6-1.0mm, ensuring that the contact area between the brake band and the brake wheel is ≥ 75%.

Empty load test braking performance: When the operating handle is released, the chain should immediately lock without slipping; When the load is released, the brake needs to automatically lock under the weight of the load.

Confirmation of Structure and Connection Security

The load-bearing capacity of brackets, crossbeams, and hanging ropes is ≥ 4 times the rated load (safety factor 4:1); The bolts and rivets are not loose, and the welds are not cracked or deformed; The pulley anti slip groove device is effective, and the rope groove wear is ≤ 10%.

The hydraulic system oil level is normal, with no oil leakage or blockage; Electrical equipment has good insulation, reliable grounding protection, and sensitive short-circuit/overcurrent protection devices.

2、 Environmental Risk Assessment and Control

Safety inspection of work environment

Avoid obstacles, high-voltage lines, acidic and alkaline environments, high-temperature areas, and flammable and explosive areas; High altitude operations are prohibited in wind speeds ≥ 6 or rainy or snowy weather; Narrow spaces require unobstructed operating paths and good ventilation.

Set up safety warning zones and assign guardians; High altitude operations require wearing safety belts, setting up safety nets, and anti fall devices; Maintain a safe distance from overhead power lines (such as 10kV lines ≥ 3m).

Load characteristics and lifting point evaluation

The load weight must be accurately calculated, and overloading or inclined lifting is prohibited; Long items should be lifted horizontally to avoid vertical lifting; When lifting with two machines, keep the hook pulley assembly vertical with appropriate spacing, and distribute the load according to 75% of the minimum lifting capacity.

The lifting point should be stable and the load-bearing structure should be reliable; Special measures (such as using a vibrating hammer to loosen) should be taken when lifting buried/solidified heavy objects.

3、 Startup operation steps and specifications

Preparation before lifting

Loosen the lifting chain with the anti pull bracelet to ensure sufficient lifting distance; Slowly lift and check all components for any abnormalities after the chain is tightened (such as the hook being secure and not stuck); When the load hovers for more than 5 minutes, tie the bracelet to the lifting chain to prevent self-locking failure.

Operating standards during operation

The direction of the zipper should be consistent with the rotation direction of the sprocket to avoid chain jamming; When performing horizontal/inclined operations, it is necessary to use padding to support the chain; Stop the machine immediately for troubleshooting if it cannot be pulled by hand. It is forbidden to forcefully add people or use extension bars to pry it.

When the operating handle is placed in the "neutral" position, the chain should be able to manually adjust its position freely (unloaded state); The direction of operation (up/down) should be consistent with the direction of rotation of the handle.

4、 Safety standards and compliance requirements

Qualification and file compliance

The equipment must have a special equipment manufacturing license, qualification certificate, and supervision and inspection certificate; Installation and dismantling units need to hold professional qualifications, prepare special construction plans, and have them verified by experts; Operators need to hold certificates and be familiar with equipment performance and safety standards.

Configuration of protective facilities

Install lightning protection grounding devices and maintain a safe distance from overhead power lines; Set up anti climbing devices, protective shelters, and warning signs; Equip safety nets and fall arresters for high-altitude operations; Choose explosion-proof or corrosion-resistant models for humid/corrosive environments.

5、 Fault prevention and emergency measures

Common fault prevention

Brake malfunction: Regularly adjust brake clearance and clean oil stains; Replace the main spring in a timely manner when it is damaged or the locking nut is loose; Check the oil cleanliness and impeller flexibility of the hydraulic push rod brake.

Chain breakage: avoid overloading and frequent winding of pulleys; Regularly inspect the wear and fatigue cracks of the chain; Do not use extension rods to forcefully operate.

Electrical faults: Regularly check cable insulation, grounding protection, and short-circuit/overcurrent protection devices; Avoid using non explosion proof electrical appliances in humid environments.

Emergency response process

In the event of chain jamming, chain breakage, or brake failure, immediately stop the machine and evacuate personnel; Activate backup equipment or take emergency braking measures (such as manual locking devices); Report to professional maintenance personnel to troubleshoot and prohibit self disassembly or repair.

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