How to maintain the slewing bearing of crane?

The slewing bearing of crane is an important joint of crane, so its maintenance is very necessary. For the maintenance of slewing bearing, we should do the following procedures：

Check the bolts on the slewing bearing

1. check the bolts on the slewing bearing visually before each operation of the crane.

2. After the operation of the slewing bearing for the first 100 working hours, we should check whether the bolt is loose or not; check again when operating for 300 working hours; check every 500 working hours thereafter. If bolt is found loose in inspection, please stop the operation and ask the professional technician to check.

3. Fill the slewing bearing with lithium grease before installation.

4. When changing bolts, wipe them clean and fasten them after using retainer; use cranes according to operation manual and lifting performance table; check fastening bolts as required.

Regular check of slewing bearing

1. Check the flexibility of rotation regularly. If noise and impact are found, we should should stop the machine immediately and do troubleshooting.

2. Check whether there are cracks or breakage in the gear ring. 

3. Check the seal condition regularly. If the seal is damaged, replace it in time. 

Bearing Manufacturers are equipped with their own performance

The actual performance of the Bearing manufacturer are fitted with the bearing not only its own performance, but also on the bearing is closely related to the specific installation conditions, therefore, to the bearing is installed with the form, fit the neutral center study, the actual use of the Dental bearing in able to get better performance.

Ceramic Ball Bearings with high temperature resistance

Ceramic Ball Bearings with high temperature resistance, wear resistance, corrosion resistance, no mercy, electrical insulation, self-lubricating, high-speed and other features. Can be used in extremely harsh environments and special conditions, can be widely used in aviation, aerospace, marine, petroleum, chemical, automotive, electronics, metallurgy, electric power, textile, pumps, medical equipment, scientific research and national defense and military fields, is the application of new materials, high-tech products; Cylindrical roller bearing  nd rolling silicon nitride (SI3N4) or zirconia ceramic materials, maintaining PTFE, nylon 66, polyimide, stainless steel or special aviation aluminum, thus expanding the application of ceramic bearing surfaces. Such as: high-speed bearings, high temperature bearings, corrosion-resistant bearings, magnetic bearings, electrical insulation bearings. Is internationally recognized as the future of the mainstream products bearing, bearing market will occupy 40 to 60 percent share. Recent market of 10 billion, mainly used in high-speed machine tools, high-speed motor, cryogenic equipment, the current development and production of precision can be gradually replaced, the speed above all bearing in all applications.

For some high-precision bearings

You need higher speeds (ie, high-speed machining centers or internal grinding), you need to find a different bearing solutions.
For some high precision bearing, its clutch bearing  requirements is very high, today we have to introduce a configuration problem on precision bearings.
Precision bearings spindle traditional application areas, according to different processes, machine tool spindle have different requirements. In general, the lathe spindle is used at lower speeds and larger cutting metal cutting load. This type of spindle are usually transmitted through the pulley or gear drive torque. This means that the load on the drive end shaft is quite large.

Precision bearings Definition

Precision bearing Precision bearings according to ISO grading standards are divided into: P0, P6, P5, P4, P2. Successively higher level, where P0 is the general accuracy, other grades are precision level. Of course, different classification standards, different types of bearings, their classification method somewhat different, but the meaning is to the. The use of performance requirements of precision bearings rotating body with high runout accuracy, High speed Spindle and small changes in friction and friction.

Roundness error and there are four main methods.

roundness measurement error and there are four main methods.
① minimum zone method: the outline of an inclusive circle radius difference measured radius of the smallest difference of two concentric circles as roundness error.
② method of least squares the circle: circular contour corresponding to the measured points to the square of the distance and the circumference of the smallest circle center of a circle, made inclusive measured radius of two concentric circular contour difference is the roundness error.
③ Minimum circumcircle method: apply only to the outer. Inclusive test circle contour and a minimum radius of circumcircle center of a circle, a circle made inclusive measured two concentric contour radius difference is roundness error.
④ maximum inscribed circle method: apply only to the inner circle. Connected to the test within a radius of two concentric circular contour and circular contour difference between the measured radius of the largest inscribed circle center of a circle, simulation testing the roundness error is made inclusive.

double row and multi- sleeve bearing

Thrust needle roller bearings
Separated by a Precision bearing  raceway ring and needle roller and cage components , (WS) can be used with any combination punching thin raceway ring (W) or processing of thick -cut raceway ring . Non-separable bearings are precision stamping by a raceway ring and needle roller and cage assemblies maintain overall bearing constituted . This class can withstand axial load bearing . Small footprint , compact design in favor of mechanical , they use only the needle roller and cage assemblies , and the Bearing test machine mounting surface of the shaft and housing to use as a raceway .
The basic structure of the bearing inner ring with the NU -type cylindrical roller bearings the same , but because of the use of the needle , the volume can be reduced , and can withstand high radial load bearing without inner ring should have a suitable mounting surface accuracy and hardness of the shaft as raceway use .