In order to prolong the service life of the crane, improve the use rate of the equipment and ensure safe production, the daily maintenance and planned maintenance of the lifting equipment must be done well.
Doing a good job in crane maintenance during the inspection interval is the basis for ensuring the continuous operation of the crane. Correctly do the maintenance during the maintenance interval. Maintenance work can extend the maintenance interval, reduce the workload of maintenance and improve the productivity of the equipment. Maintenance of the crane during the inspection interval is divided into: on-duty inspections, including maintenance, external inspections, cleaning, lubrication, and tightening. The first-level maintenance is a regular maintenance work, and the crane operator is responsible for it, mainly including the inspection, lubrication, tightening and adjustment of wire ropes, reels, pulleys, bearings, couplings, reducers, brakes, etc. First-level maintenance is regular maintenance work, which is responsible for maintenance workers, including the maintenance of various mechanisms and equipment of the entire crane.
A planned overhaul of an overhead crane is the maintenance and repair of the crane within the dates specified in the plan. The purpose is to prevent excessive wear or accidental damage of the crane, eliminate hidden dangers of equipment in time, keep the crane in a good technical state, ensure the safe operation of the crane, and complete the maintenance of the crane with the shortest downtime and the minimum maintenance cost to achieve the purpose of increasing production, saving and reducing costs. Planned maintenance can be divided into minor repairs, medium repairs, and major repairs.
The task of minor repairs is to eliminate faults found in the operation and maintenance of the mechanism and restore the machinery to normal operation by repairing and replacing parts. Minor repairs are local repairs, which take a short time and repair what is broken. The main repair contents include carrying out a comprehensive inspection of the mechanical rotating parts, electrical equipment parts and metal structure parts of the entire crane. Clean all lubrication points according to their respective lubrication cycles and change oil for lubrication. Disassembly, replacement, or repair of individual components. Repair or replacement of certain electrical components. For electro-mechanical parts with a tendency to be damaged, technical preparations should be made as a foreseeable repair content so that they can be dealt with in the next repair cycle.
Intermediate repair is to partially decompose the crane, repair or replace the worn parts, correct the geometric position and accuracy of the crane, and maintain the technological performance of the crane. In addition to the entire contents of minor repairs, its maintenance content also includes: disassemble, inspect, clean, repair, or replace and lubricate the electro-mechanical components that work frequently and are heavily loaded. Technically ready electro-mechanical components are replaced on schedule. Conduct a comprehensive inspection of the electrical wiring of the crane, and replace some aging wiring and damaged electrical components
Overhaul is to dismantle all parts, disassemble and inspect each component, repair repairable parts, replace non-repairable parts or individual components, and require the crane to meet or approach the technical standards and mechanical properties specified in the factory after overhaul. Its maintenance mainly includes: all the mechanisms in the mechanism parts are decomposed, including the reducer, coupling, reel group, wheel group and clothing storage and other components, and the replacement is damaged and has reached the end of life. Standard parts, cleaned and reassembled and lubricated, replaced wire ropes, brakes of various mechanisms and their opening devices. The motors of each mechanism should be dispersed, dried, assembled and lubricated, and the severely damaged motors should be replaced. Replace the opening device of the brake of each mechanism; replace the damaged cam controller of each mechanism; overhaul the protection cabinet or replace the protection cabinet; replace the wiring of all lines, re-wiring and install; replace the control board of the lighting signal system, etc. For the metal structure part, correct, repair and reinforce the main girder that has been bent downward or sideways: clean the whole crane, and paint it twice for protection. After the overhaul, the crane should be debugged and be identified according to the static and dynamic load test procedures. Then it can be put into production and use after passing the test.
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