What is turntable bearing?

As an important basic component of construction machinery, turntable bearings have been widely used in the past ten years with the rapid development of the host industry. In addition to supporting excavators, tower cranes, truck cranes and various cranes, they are also widely used in light industry. Machinery, metallurgical machinery, medical machinery, industrial robots, tunnel boring machines, stackers and reclaimers, rotating stages, etc.

• What is the root cause of the early failure of the turntable bearing due to broken teeth?

• What should I pay attention to when installing turntable bearing?

• What should I pay attention to after installing the turntable bearing?

What is the root cause of the early failure of the turntable bearing due to broken teeth?

The working condition of the excavator is worse than that of the main engine in most industries that use turntable bearings, such as tower cranes and truck cranes. Therefore, the modulus of the turntable bearing for excavators is one step larger than that of the turntable bearing for the main engine of other industries with the same raceway diameter, and it is a hard tooth surface (generally, different hardness segments are selected between 47HRC and 58HRC), which basically meets the requirements. Excavator requirements for turntable bearing gears. Although statistics show that the probability of early tooth breakage of the turntable bearing for excavators is greater than that of other main engines, it is limited to very few two or three types of excavators, and most models rarely have turntable bearing early broken teeth accidents.

What should I pay attention to when installing turntable bearing?

When installing the turntable bearing, radial positioning should be performed first, the mounting bolts should be cross-tightened, and the rotation of the bearing should be checked. To ensure smooth bearing drive, the gears should be checked for meshing before the mounting bolts are not tightened. There should be sufficient pre-tightening force when tightening the bolt, and the pre-tightening force should be 70% of the yield limit of the bolt material. Mounting bolts should be equipped with quenched and tempered flat washers, and spring washers are strictly prohibited. After the turntable bearing 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 the above inspection should be repeated every 500 hours of continuous operation.

What should I pay attention to after installing the turntable bearing?

After the turntable bearing is installed, an appropriate amount of grease should be filled, and the turntable bearing should be filled while slewing the bearing to make the grease evenly distributed. After the turntable bearing works for a period of time, it will inevitably lose a part of the grease, so the turntable bearing in normal operation should be replenished with grease every 50 to 100 hours. For turntable bearings that work in high temperature environment or under dusty conditions, the period of adding lubricating grease should be appropriately shorter. When the machine is to be shut down for storage, it must also be filled with sufficient grease.

If you want to get more information about the turntable bearing, please connect LYXQL Slewing Bearing Co., Ltd. founded, they will be very pleased to help you.