In many fields such as industrial production, logistics, container transportation, and construction, purely mechanical lifting equipment serves as a key tool for material handling and loading and unloading, playing an indispensable role. The stability and reliability of its performance are directly related to the safety and efficiency of operations. However, due to long-term operation under high loads and complex environments, the components of lifting equipment gradually wear out and age. If timely and effective maintenance is not carried out, it will not only shorten the service life of the equipment but may also lead to safety accidents. Therefore, carrying out proper maintenance of purely mechanical lifting equipment is of extremely important significance.
2. The Importance of Maintenance and Upkeep
(1) Ensuring Operational Safety
Once a purely mechanical spreader fails, such as a broken wire rope or a deformed hook, lifting heavy objects may result in falling loads, causing significant harm to personnel and equipment below. Regular maintenance and upkeep can timely identify and eliminate potential safety hazards, ensuring the hoist is always in a safe and reliable operating state, maximizing the protection of operators' lives and the company's property.
(2) Extending Service Life
Through proper maintenance measures such as regular lubrication, cleaning, and tightening, wear and corrosion of container spreader components can be reduced, and the aging of parts slowed, effectively extending the overall service life of the hoist and reducing equipment procurement costs for the company.
(3) Improving Operational Efficiency
Well-performing hoists can quickly and accurately complete material handling tasks, reducing downtime caused by hoist failures and improving the continuity and efficiency of production operations, thereby creating greater economic benefits for the company.
3. Daily Inspection Key Points
(1) Appearance Inspection
Before daily operation, operators need to inspect the mechanical container spreader's appearance, checking whether the hook, lifting ring, shackle, and other components have cracks, deformations, or wear; whether the wire rope has broken strands, broken wires, twists, or rust; and whether the chain is bent, deformed, or excessively worn. Additionally, inspect whether the connections of the hoist are firm and free from looseness.
(2) Functional Inspection
Conduct simple functional tests, such as lifting, lowering, and rotating the container spreader, to check whether all mechanisms operate smoothly and flexibly, with no abnormal noise or jamming. For hoists with braking devices, check whether the braking performance is good and whether the braking distance meets requirements.
(3) Safety Device Inspection
Confirm whether the container spreader's safety devices, such as limiters and overload limiters, are functioning properly. The limiter prevents the hoist from exceeding its limit position, avoiding collision accidents; the overload limiter can promptly issue a warning and cut off power when the hoist is overloaded, preventing accidents.
4. Regular Maintenance Measures
(1) Cleaning and Lubrication
Regularly perform comprehensive cleaning of the mechanical spreader to remove dust, oil, debris, etc., preventing them from affecting internal component operation. Lubricate all rotating and friction parts of the mechanical spreader according to regulations, using appropriate lubricants to ensure good lubrication between components and reduce wear. For example, wire ropes should be regularly coated with specialized wire rope grease, and chains can be lubricated with machine oil.
(2) Component Replacement and Repair
According to the usage and wear of the hoist, regularly replace components that meet the discard criteria or are severely worn. For instance, if the number of broken wires per lay of a wire rope reaches the specified proportion, or the hook opening exceeds a certain limit of the original size, it must be replaced promptly. Slightly worn or damaged parts can be repaired, such as correcting a deformed hook, but repaired parts must pass strict inspection before being used again.
5. Common Fault Handling Methods
(1) Wire Rope Faults
If broken strands are found in the wire rope, the decision to continue use should be based on the number and location of the broken strands. If the broken strands are concentrated in a certain section or cluster in a specific area, or reach the discard standard, the wire rope should be replaced immediately. For wire rope rust issues, the surface rust should first be removed, and then anti-rust grease should be applied for protection.
(2) Hook Faults
When cracks appear on the hook, it must be stopped from use immediately and replaced. Welding repair on a cracked hook is strictly prohibited. If the hook is excessively worn or the opening has widened, a new hook should also be replaced in accordance with the regulations.
(3) Brake Faults
If the brake fails, first check whether the gap between the brake wheel and brake pad is appropriate. If the gap is too large or too small, adjust it. Check whether the brake spring is loose or damaged, and if necessary, tighten or replace it. At the same time, check whether the hydraulic system or transmission components of the brake are functioning normally. After eliminating the faults, restore the brake to normal operation.
