Troubleshooting of Marine Crane Slewing Bearing

Troubleshooting of Marine Crane Slewing Bearing(Update 2022)

Before learning about large slewing bearings for marine cranes and marine machinery. To understand the standard and precision system of slewing bearing. Accuracy grades: Product accuracy covers four grades: P0, P6, P5, and P4.

Executive standard: general bearing GB/T307; slewing bearing JB/2300; shipbuilding industry CB/T3669; machinery industry JB/T10471; wind power bearing JB/T10705

1. The slewing bearing mechanism is composed of three parts: the supporting device, the slewing drive device and the turntable. Its important mechanical component– slewing bearing, is an important force-bearing component. It not only bears the self-weight of the rotating part of the crane, but also bears the vertical direction of the hoisting load.

The force of action and tipping moment. In the process of use, there must be wear and tear, and the performance of the related mechanical parts will gradually deteriorate or even be damaged. Therefore, the common faults of the slewing mechanism are also related to the mechanical parts. Accordingly, the failure analysis of marine cranes can generally be started from two aspects: mechanical failure and hydraulic system failure.

Experience shows that the common faults of the slewing mechanism mainly include excessive clearance of the slewing bearing (open movement), slow action of the slewing system (weakness) or motionless, abnormal system pressure, oil leakage, and inability to lock the slewing brake valve.

1.marine crane slewing bearing weak or unable to swing (system pressure is normal)

1. The hydraulic motor fails and the power cannot be output normally. Repair or replace it.

2. The failure of the reducer will affect the power transmission, check and adjust.

3. In case of overload, the lifting weight must be rechecked to avoid overload.

4. The overflow valve and manual control valve are faulty, check and adjust.

2. marine crane slewing bearing can not be rotated (system pressure is normal)

2. The large amount of rotation of the slewing bearing of the dock crane may have the following reasons:

1. It may be aged, it will be ground badly without butter, and the gap between the gear and the rotation is too large, all of which are ground.

2. The standard frame of the slewing bearing is less than 1 degree. But there will be some.

3. The steering reducer is broken.

4. There is a gap between the gears. Suggestions: If you want to change this state, you need to replace the slewing bearing and the gear of the slewing oil pump.

3. How to solve the abnormal noise when the ship crane slewing bearing swings back and forth

If the turntable of the ship crane swings back and forth, it will be more likely to cause danger. Therefore, in order to avoid the phenomenon of swinging back and forth, once such a fault occurs, it should be adjusted and repaired in time to avoid the dangerous phenomenon caused by the swinging of the turntable back and forth. Then, if the ship crane swings back and forth, how should it be adjusted?​​

1. Adjust the basic arm of the ship crane slewing bearing, so as to fix the basic arm and reduce the swing amplitude;

2. If the oscillation is caused by the excessive displacement distance of the outer ring, we need to adjust the gear backlash of the slewing bearing and the reducer;

3. When we adjust the slewing bearing of the ship crane, we should pay attention to the amplitude of the swing not exceeding 4mm, which can reduce the occurrence of danger.​​

Therefore, by adjusting the swing range of the turntable of the ship crane in the above manner, the danger of the ship crane caused by the excessive swing range of the turntable can be reduced. When the crane is working, the turntable vibrates or makes abnormal noises.

First, whether the marine crane slewing bearing clearance is too large, the slewing clearance is large, and the starting is not stable, and abnormal noises will occur.

Second, the marine crane slewing bearing motor parts are damaged or the slewing gear box parts are damaged.

Third, the marine crane slewing bearing support ball or raceway is damaged.

The marine crane slewing bearing of the wharf crane operates in a high temperature environment. The slewing bearing produced by our company can work normally at -30-+70. If the user needs a bearing with a lower or higher temperature, our company’s engineering and technical personnel can design it for you.

Our company can customize the high temperature resistant slewing bearing, which can be applied to high temperature 200. The high temperature resistant sealing strinvironment.

2. Precautions for the operation op is made of fluorine rubber, the high temperature resistant isolation block is made of aluminum alloy or copper alloy, and the high temperature resistant lubricating grease is used to ensure the stable performance of the small slewing bearing in the high temperature ef the slewing bearing of the dock crane Before the slewing bearing is installed, the installation surface of the main engine should be checked first. It is required that the support should have sufficient strength, the connecting surface should be machined, and the surface should be smooth and free of debris and burrs.

For those that cannot be machined to achieve the required flatness, special plastics with high injection strength can be used as fillers to ensure the accuracy of the installation plane and to reduce vibration. The ferrule of the wharf crane slewing bearing has a quenched soft belt area, which is marked with S on the end face of the ferrule. When installing, the position of the soft belt should be placed in the non-load area or the non-regular load area (the plug hole is always located in the soft area. belt).

3. How to maintain the slewing bearing of the quay crane in operation? After the slewing bearing of the quay crane is installed and put into operation, after 100 hours of continuous operation, the pre-tightening torque of the mounting bolts should be fully checked whether it meets the requirements, and repeated every 500 hours of continuous operation. Check the above once.

4. The quality requirements of the slewing bearing of the wharf crane The quality inspection of the marine crane  slewing bearing can be divided into axial clearance and radial clearance according to the different detection methods. The radial clearance is the combination of the inner group, outer ring and rolling elements of the bearing. It is an important item for the inspection of ships with much higher quality standards in accordance with the national standard JB/T10471. Relative to CB/T.