How To Do Electric Hoist Overhead Crane Maintenance
How to maintain your overhead crane? Check general requirement, Planned & Unplanned maintenance,Adjustment maintenance & lubrication , etc. Read on.
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√Overhead Crane Type: HD, √ Capacity : 1~30 ton, √ Span: ≥6m, √ Working Class: A5
Maintenance is to keep the crane or restored to perform its required function of the state by a series of work: monitoring, detection, replace, adjust, and repair management.
Maintenance procure.
Maintenance work should have some certain procure, and the procures should made according to the manufacture instruction, if no the manufacture instruction, the maintenance procure should be done be a qualified person, to record the original records.
Maintenance stuff
The lowest requirement of the maintenance stuff : qualified title, have a good master of the crane structure and the common obstacle and accidents, trained by special maintenance technical dep, familiar with the crane safety requirement.
Planned maintenance
The planned maintenance is regular maintenance, to reduce the crane fault or the probability of function fault reoccur, to maintain according to the specified standard.
Unplanned maintenance
Unplanned maintenance belongs to the maintenance or overhaul, refers to the malfunction or failure after inspection, in order to repair a crane to perform its required function state maintenance.
Adjustment maintenance.
In accordance with the maintenance routine inspection requirements of the program, if there are any dangerous situation, should resume operation in the crane before be excluded, all the hidden dangers of parts for repair or adjustment change, to ensure its normal function.
Hoist crane which has the following dangerous parts should maintain and adjust.
- Cracked, broken, severe corrosion and bending deformation of the crane parts.
- Cracked, broken, severe corrosion and bending deformation of the crane steel structures.
- Damaged or excessive wear of the hook.
- For the depressing or burning plug should replace with a set of adjustment.
- Control button and warning sign should be legible.
The quality of the replace parts should be the same with the manufacturers, if use the repair welding method, steelwork shall be in accordance with the provisions, welding specification, welding repair parts of the material and identification.
Precautions before maintenance.
- Crane should be removed to the minimum interference areas.
- When maintaining, the suspended load should be shed.
- All control equipment should be closed.
- Use the logo lock procedures, and the “maintenance” signal and the control and manipulate electrical switch gear must be locked in the “off”.
- Use warning signs and fence on the ground when there are maintenance tasks on the top.
- Turn down the power when maintaining.
- When removing the hydraulic device, release pressure.
- Preventive measures after maintenance.
- Reinstall the protective device.
- Restore the role of security device, and calibrate again if necessary.
- Remove the replaced spare parts and loose items.
- Remove the maintenance tools and equipment.
- lubricating maintenance.
All need lubrication parts in crane should regularly check, and check whether the lubrication delivery is clear, as for the lubrication parts and numbers and types, all should abide by the manufacturer’s suggestion. When applying lubricant crane should be still provide protective measures, unless it is equipped with automatic or remote lubrication device.
- Friction lubrication maintenance work: control, reduce wear and tear, reduce the temperature, to prevent corrosion, sealing.
Llubricating method.
- Dispersion lubricating oil cup, nozzle, oil gun, etc.
- Centralization lubrication.
- Glycerin lubrication: manually lubrication oil pump, oil filter oil feeder
- electric glycerin: motor, reducer, pump, oil reservoir oil pool
- lubrication points: slow down the body.
Common lubrication points.
Hook nut bearing, dynamic and fixed pulley bearings ; wire rope, roll end bearing, the bearing , gear reducer, coupling gear, brake intersection, motor bearings, wheel bearing.
- Remove the dirt and rust corrosion in daily maintenance.
- Clean the cab’s room windows.
- Clean the dust in cab’s room ,walkway, ladder.
- Clean the dust in the motor, electrical equipment, reducer, and the bearing block.
- Remove dirt with snow and ice on the tracks,etc.
- In the bare and there is relative motion friction, oil and remove dirt on time.
- Missing paint, paint touch-up in a timely manner.
- Increase the cover on the parts.
- Electric circuit part should pay attention to prevent the electric wire and cable aging, cracking, leakage and short circuit.
