The operation and maintenance of a Leveraged Chain Gourd crane must strictly follow safety regulations and technical standards. The following are systematic precautions and operation guidelines:

1、 Preparation and inspection before operation

Comprehensive inspection of equipment

Chain and hook: Check the chain for twisting, breakage, cracks, or excessive wear (if the diameter of the chain link is worn by more than 10% and the pitch elongation exceeds 3%, it needs to be scrapped); When the dangerous section wear of the hook exceeds 10%, the opening degree increases by more than 15%, or the torsional deformation exceeds 10 °, it must be replaced.

Braking system: Confirm that the brake is sensitive and reliable, the wear of the 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.

Structure and Connection: Brackets, crossbeams, and hanging ropes must be stable, with a load-bearing capacity of ≥ 4 times the rated load; The bolts and rivets are not loose, and the welds are not cracked or deformed.

Auxiliary device: The pulley anti slip groove device is effective, and the rope groove wear is ≤ 10%; The bracelet has no slipping or falling phenomenon, and the rotation direction is consistent with the sprocket groove.

Environmental and load assessment

Avoid obstacles, high-voltage lines, acidic and alkaline environments, and high-temperature areas; It is prohibited to lift, overload or pull buried/solidified heavy objects diagonally.

The load weight needs to be accurately calculated, and when lifting multiple machines, it should be distributed according to 75% of the minimum lifting capacity, and a dedicated person should be assigned for unified command.

2、 Operation process specification

Basic Operations

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 (such as secure hooks and no jamming) after the chain is tightened.

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, and do not forcefully add people or pull.

Aerial suspension: When a heavy object is suspended for more than 5 minutes, tie the bracelet to the lifting chain to prevent self-locking failure; Personnel are prohibited from standing under suspended objects or in the direction of force.

Special scenario handling

Lifting of long items: Vertical lifting is prohibited, horizontal lifting is required; When lifting with two machines, keep the hook pulley assembly vertical with appropriate spacing.

Narrow space: Prioritize the use of portable models to ensure unobstructed operating paths; Choose explosion-proof or corrosion-resistant models for humid/corrosive environments.

High altitude operations: Wear safety belts, set up safety warning areas, and provide guardians; Work is prohibited during wind speeds ≥ 6 or rainy or snowy weather.

3、 Key points of maintenance and upkeep

routine maintenance

Lubrication and Cleaning: Regularly lubricate rotating components such as chains, bearings, gears, etc. (to avoid lubricating oil contamination of friction plates); Clean electrical equipment, check cable insulation and safety devices (such as overcurrent protection and limiters) for sensitivity.

Component inspection: Check the wire rope for broken wires, wear, and corrosion every month (safety factor ≥ 6); Adjust the brake clearance to 0.6-1.0mm, ensuring that the contact area between the brake band and the brake wheel is ≥ 75%.

**Structural Inspection - Structural Inspection: Check for cracks, corrosion, and deformation in metal structures; The connecting bolts are tightened and the welds are free of cracks; The hydraulic system oil level is normal, with no oil leakage or blockage.

Regular maintenance and storage-**

Periodic maintenance: replace hydraulic oil and lubricating grease according to the manufacturer's recommendations; Quarterly inspection of drum wall thickness (thinning ≤ 18%) and pulley groove wear.

Storage requirements: Store in a dry and clean environment to avoid chain compression; Clean and lubricate before long-term idle, and hang in an unloaded state; Cover with dust-proof cloth after rust prevention treatment.

Scrap standard: When the components such as chains, hooks, gears, etc. reach the scrap standard, they should be replaced immediately. Improper use is prohibited.

4、 Safety standards and fault prevention

safety standards

Qualifications and archives: The equipment must have a special equipment manufacturing license, qualification certificate, and supervision and inspection certificate; The installation and dismantling unit needs to hold professional qualifications, prepare a special construction plan, and have it verified by experts.

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; High altitude operations are equipped with safety nets and fall arresters.

Fault prevention and emergency response

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.

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