1. What is the service life of an overhead crane?
The designed service life of an overhead crane is generally 20 to 30 years. The utilization level and load status of the bridge crane determine the working level of the crane. In other words, it can be said that the working level is determined, and under a certain load state, it has a certain number of working cycles, that is, its lifespan. Generally speaking, the service life of bridge crane working classes A1~A2 is 30 years, A3~A5 has a life of 25 years, and A6~A7 has a life of 20 years.
Although any bridge crane will undergo multiple overhauls during its entire service life, some wearing parts will be replaced during each overhaul, such as wire ropes, rolling bearings, open gears, wheels, and brake friction. discs, brake wheels and electrical equipment, etc., and the replacement of these partial parts does not mean the end of the working life of the entire crane. However, after a crane has been used for many years, once serious fatigue cracks continue to appear in its structure to the point where the crane or trolley cannot operate normally, it is considered that the entire crane can no longer work safely. Therefore, the safe working life of a bridge crane mainly depends on the working life of its metal structure without fatigue cracks.
2. Factors affecting the service life of the bridge crane
1. Under excessively high or low temperature conditions, the working performance of each mechanism of the bridge crane will be affected. Components are prone to aging and freezing, hydraulic oil is prone to deterioration, the wear of mechanical components is intensified, and the performance of machine parts materials changes. These problems can easily affect the service life of the bridge crane.
2. If dust, metal shavings and other impurities enter the interior of the bridge crane, it will cause surface scratches on the components, obstruction of the relative movement of the components, increased wear of the parts, deterioration of the oil, and destruction of the isolation oil film, etc. , resulting in various failures or damage to the bridge crane, thus affecting its service life.
3. The acidic substances contained in rainwater will cause corrosive damage to the structural surface of the bridge crane, and the components of certain chemical substances will also cause corrosion to the surface of the bridge crane components. This kind of destructiveness will greatly shorten the service life of the bridge crane. Therefore, attention should be paid to the rainproof problem of the bridge crane and the chemical composition of the working environment.
4. Unreasonable use of bridge cranes will put a burden on engines and other mechanical parts, such as overloaded lifting, long-term high-speed operation, etc. The final result is the failure rate and damage rate of the bridge crane. When it becomes larger, its service life will naturally not be guaranteed.
3. Bridge craneHow long is the periodic inspection cycle?
Overhead crane is a commonly used lifting equipment and is widely used in various industrial fields. To ensure its safe use, regular inspections are required. Bridge crane inspection includes initial inspection, periodic inspection and special inspection.
1. Initial inspection: After the bridge crane is installed and debugged, an initial inspection is required to check whether its overall performance and various technical indicators meet the requirements.
2. Periodic inspection: The periodic inspection cycle of bridge cranes is determined according to relevant national regulations and standards. Generally it is 12 months, but the specific period needs to be analyzed based on factors such as the usage of the crane and the working environment. Regular inspections mainly check whether the various performance indicators of the bridge crane meet the standard requirements, and carry out necessary troubleshooting and repairs.
3. Special inspection: Bridge cranes require special inspection under special circumstances. For example, if a bridge crane has been in a special corrosive environment for a long time, or has undergone major modifications and repairs, special inspections are required to ensure its safe and reliable use.
4. Specific items for periodic inspection of bridge cranes
The periodic inspection of bridge cranes mainly includes the following items:
1 . Structural component inspection: Check whether each component is deformed, cracked, worn, rusted, etc.
2. Electrical system inspection: Check whether the electrical system is operating normally and perform necessary cleaning and maintenance.
3. Lubrication system inspection: Check whether there is grease in each lubrication point, and perform necessary filling and replacement.
4. Braking system inspection: Check whether the brakes are working properly and perform necessary cleaning and maintenance.
5. Lifting mechanism inspection: Check whether the lifting mechanism is operating normally and perform necessary cleaning and maintenance.
6. Inspection of the traveling mechanism: Check whether the traveling mechanism is operating normally and perform necessary cleaning and maintenance.
7. Wind resistance stability check: Check whether the bridge crane has sufficient wind resistance.
8. Load test: Carry out necessary load tests to detect performance indicators such as lifting capacity and limiters.
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