Daily maintenance and maintenance of Tower-Cranes

 Daily inspection and maintenance of machinery and equipment

1. Always keep each mechanism clean, and clean all parts of dust in time; always check whether each mechanism is running normally and whether there is any noise. If a fault is found, it must be eliminated in time.
2. Check the lubrication of the gearbox, external gears and other parts. Oil and smear according to the requirements in the table. When changing the oil, remove the iron filings and impurities in the box. When refueling, pay attention to the cleanliness and filling degree of the oil.
3. Check whether the vent plugs of each reducer can be freely exhausted, and if they are blocked, they should be cleared in time;
4. Check the performance of each brake, if it is not sensitive and reliable, it should be adjusted in time;
5. Check the bolts at each connection. If they are loose or fall off, they should be tightened and supplemented in time; the connection bolts of the tower body should be checked for tightness when the tower body is under pressure.
6. Check various safety devices, and adjust them in time if they are found to be malfunctioning; each transmission mechanism must have a protective cover, which cannot be removed at will.
7. Check each part of the wire rope for broken wires and loose strands. If the number of broken wires exceeds 5% or the nominal diameter wear exceeds 5%, new wire ropes should be replaced. Check the pulley, if excessive wear is found, it should be dealt with in time;
8. Check the lubrication of each lubricating part and add grease in time.
9. When installing, disassembling and adjusting the slewing mechanism, pay attention to ensure that the center line of the planetary gear reducer of the slewing mechanism is parallel to the center line of the gear, its meshing surface is not less than 70%, and the meshing clearance should be appropriate.
Maintenance of metal structures
1. Strictly implement the scrapping standard of crane steel structure parts.
2. The metal fatigue strength, weld cracks, structural deformation, damage, etc. should be checked for the main stressed structural parts. Exception should be handled. The inspection of structural parts shall be carried out according to the following procedures.
a. Daily inspection: The tower crane should carry out a daily inspection every 80 hours of operation. When the tower crane driver is handing over the shift, he should check the tightening of the bolts of each connection part, and if they are loose, they should be tightened in time.
b. When the tower crane makes abnormal sound, or has misoperation, or finds that the tower crane safety protection device fails, it should be checked and recorded.
c. When a project is completed and the tower crane is dismantled, it should be inspected in detail by engineering technicians and professional maintenance personnel, and records should be made.
3. Try to prevent deformation and collision damage of components during transportation.
4. During the service period, it must be regularly inspected and maintained for one week and half a month to prevent corrosion, especially the torque limiter, often check whether the sensitivity is reliable, other slewing brakes, and lifting weight limiters must also be checked frequently.
5. Frequently check structural connection bolts, welds and components for damage, deformation and loosening.
6. Spray paint every 1-2 years. The rust, oil and other dirt on the metal surface should be removed before painting.
7. The trolley basket is limited to one person, and the cab is limited to 150kg. These regulations are often not noticed and are not strictly enforced.
8. Special attention should be paid to the above terms, and the hidden danger inspection of these parts must not be careless.