Application field and analysis of slewing bearing

Next, we specifically look at the application analysis of the slewing bearing in some areas:

1. Construction machinery

The slewing bearings for construction machinery usually use small-size four-point contact ball slewing bearings with a diameter of no more than 2 meters.

2, marine crane

Marine cranes generally use double-row ball, four-point contact ball, and three-row roller internal gear structure. According to different bearing capacity, three-row roller slewing bearings are usually used for heavy-duty cranes, four-point contact ball turntables and Double row ball slewing bearings for light cranes. Because the crane works in the environment of -20 ° C - 45 ° C, this type of bearing requires high mechanical properties of the material.

3. Port mobile crane

Port cranes typically use three-row roller slewing bearings with internal or external teeth of 4 meters in diameter to withstand high overturning moments.

4, stacker and reclaimer

The slewing bearings for stacker reclaimers are usually ball-column combined, three-row roller type and cross-roller type, and most of them are over 3 meters in diameter. Due to the harsh working environment and large dust, these bearings have the characteristics of high bearing capacity, long service life and good sealing performance.

5, ship unloader

The slewing bearing for the ship unloader usually adopts a three-row roller structure with external teeth and a diameter of about 4 meters.

6, tower crane

The slewing bearings for tower cranes usually use small-size four-point contact ball slewing bearings or double volleyball turntables with a diameter of no more than 2 meters.
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Slewing bearing installation guide points

1. Requirements for mounting brackets: The mounting brackets generally adopt a cylindrical structure, and the cylinder wall is aligned with the center of the raceway. In order to prevent partial overload of the slewing bearing and ensure its flexible operation, the mounting bracket should be subjected to internal stress elimination after all welding procedures, and the mounting plane should be machined. The flatness (including the horizontal deviation of the horizontal plane) should be controlled within a certain range. .

2. Before installing the slewing bearing, the mounting surface of the main machine should be inspected first. The supporting member should have sufficient strength. The connecting surface should be machined and the surface should be smooth without debris and burrs. For the inability to machine to achieve the required flatness, a special plastic with a large injection strength can be used as a filler to ensure the accuracy of the mounting plane and to reduce vibration.

3. The ferrule bearing ferrule has a quenching soft belt zone, which has the mark "S" on the end face of the ferrule. The installation position should be such that the soft belt position is placed in the non-load zone or the non-frequent load zone (the plug hole is always Located at the soft belt).

4. When installing the slewing bearing, firstly perform radial positioning, cross-tighten the mounting bolts, and check the rotation of the bearing. To ensure a smooth bearing rotation, the gears should be inspected for engagement before the mounting bolts are tightened. When tightening the bolts, there should be sufficient pre-tightening force, and the pre-tightening force should be 70% of the yield limit of the bolt material. The mounting bolts should be equipped with a tempering flat washer. Spring washers are strictly prohibited.

5. When the slewing bearing is installed, it should be filled with a proper amount of grease, and the slewing bearing should be filled while filling to make the grease evenly distributed.

6. After the installation is completed, put into operation. After 100 hours of continuous operation, check whether the pre-tightening torque of the mounting bolts meets the requirements. Repeat the above inspection for every 500 hours of continuous operation.
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