Marine cranes are important equipment for offshore operations and are widely used in ship cargo loading and unloading, maritime rescue, marine engineering and other fields. Due to its complex working environment and the fact that it is often in a high-intensity, high-load operating state, abnormal vibration or abnormal noise may occur during use. These problems not only affect the normal operation of the crane, but may also cause equipment damage or safety accidents. Therefore, in-depth analysis of the causes of abnormal vibration or abnormal noise in marine cranes and taking effective preventive and solution measures are of great significance for ensuring the safety of ship operations.
1. Reasons in mechanical structure
1.1 Loose connection parts
The various components of marine cranes, such as slewing bearings, main beams, booms, pulley blocks, etc., are connected by bolts, welding or pins. If these connection parts are loose, it may cause abnormal vibration and even abnormal noise during lifting.
Solution:
Regularly check the tightness of each connection part, and tighten or replace the fasteners in time if looseness is found.
Use anti-loosening devices such as spring washers, double nuts or thread glue.
1.2 Deformation or cracks of structural parts
Marine cranes are subjected to heavy loads and high-frequency use for a long time, which may cause slight deformation or even cracks in the structural parts. These problems will lead to uneven force, causing vibration and abnormal noise.
Solutions:
Perform non-destructive testing (such as ultrasonic testing and magnetic particle testing) regularly to detect cracks.
Repair the slightly deformed structure, and replace the severely deformed or cracked parts in time.
1.3 Bearing wear or damage
Bearings are an important part of the slewing mechanism and lifting mechanism of the crane. If they are used for a long time or lubricated improperly, they may cause bearing wear and ball damage, causing abnormal noise and vibration.
Solutions:
Check the lubrication of the bearings regularly to ensure that the lubricating oil is sufficient and meets the standards.
If the bearing is found to be severely worn or damaged, it should be replaced immediately.
2. Reasons from the hydraulic system
2.1 Hydraulic oil contamination or aging
The hydraulic system is the core power source for the operation of the marine crane. If the hydraulic oil is contaminated (such as water or impurities entering), or if the oil is aged due to long-term non-replacement, it may cause the hydraulic components to get stuck, resulting in vibration or abnormal noise.
Solution:
Check the quality of hydraulic oil regularly and replace it in time if it is contaminated or aged.
Use high-quality filters to reduce oil contamination.
2.2 Failure of hydraulic pump or hydraulic motor
Wear, blade breakage, bearing damage, etc. of hydraulic pump and hydraulic motor will cause system pressure fluctuations, causing abnormal vibration or abnormal noise.
Solution:
Check the working status of hydraulic pump and motor regularly and listen to whether the running sound is abnormal.
Find faulty parts should be repaired or replaced in time.
2.3 Blockage or leakage of hydraulic pipeline
If the hydraulic pipeline is blocked or air enters, it may cause poor operation of hydraulic system, causing vibration or abnormal noise.
Solution:
Clean hydraulic pipeline regularly to prevent blockage.
Make sure all joints are well sealed to prevent air from entering.
3. Causes of electrical system
3.1 Motor failure
The motor is an important driving source of crane. If the motor winding is short-circuited, the insulation is aged or the bearing is damaged, it may cause abnormal vibration or abnormal noise when the crane is running.
Solution:
Check the current, voltage, temperature, and other parameters of the motor regularly and deal with abnormalities in time.
Check the lubrication of the motor bearings and replace the bearings if necessary.
3.2 Failure of the inverter or control system
Modern marine cranes mostly use variable frequency speed regulation systems. If the inverter parameters are improperly set or damaged, the motor may run unstably, causing vibration or abnormal noise.
Solution:
Adjust the inverter parameters in time to match them with the load.
Regularly check the heat dissipation and wiring of the inverter to avoid failures.
4. Impact of environmental factors
4.1 Ship swaying or bad sea conditions
The working environment of marine cranes is special. When the sea conditions are unstable, the swaying of the ship will produce additional impact on the operation of the crane, causing vibration or abnormal noise.
Solution:
Reduce the operating frequency of the crane in bad sea conditions and avoid high-intensity use.
Select a suitable anti-wind swing device to improve the stability of the crane.
4.2 Impact of temperature changes
Extreme temperatures (such as high or low temperatures) may cause changes in the viscosity of the lubricating oil, affect the operating status of mechanical parts, and cause abnormal vibration or abnormal noise.
Solution:
Choose lubricants suitable for different climatic conditions to ensure that the equipment can operate stably in various environments.
Preheat or cool the equipment appropriately under extreme temperature conditions.
The reasons for abnormal vibration or abnormal noise of marine cranes involve mechanical structure, hydraulic system, electrical system and environmental factors. According to different reasons, corresponding inspection, maintenance and preventive measures should be taken to ensure the safe and stable operation of the crane. Regular maintenance, reasonable use and enhanced monitoring can effectively reduce the occurrence of failures, improve the reliability and service life of equipment, and provide solid protection for ship operations.
As a professional marine crane exporter, in order to ensure the stable operation of marine cranes, we not only provide high-quality equipment, but also pay attention to the maintenance and maintenance of equipment in after-sales service. We provide customers with regular technical support and troubleshooting services to ensure timely discovery and resolution of common problems such as vibration and abnormal noise. At the same time, we improve the operating efficiency and safety of marine cranes through optimized product design, strict manufacturing standards and advanced vibration isolation technology. As an industry-leading exporter, we are committed to providing reliable and safe marine crane products to customers around the world, and helping customers maintain efficient operation in complex offshore environments through professional technical support.
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SHANGHAI HAOYO MACHINERY CO., LTD.
