How to find the problem of excavator bearing accessories in advance and what to do if there is a problem?

In order to maintain the good performance of excavator bearing accessories, daily maintenance, detection, overhaul and preventive measures must be done well.
For long-term operation of equipment, the usual detection and tracking is particularly important, including the rotation sound, vibration, temperature, lubricant status, etc., of excavator bearing accessories. According to the detection results, equipment maintenance personnel can find and deal with problems in time.

Excavator bearings often ring in the operation of equipment. It may be the quality problem of the bearings themselves, or it may be other reasons. Today, Volvo construction machinery accessories Xiaobian will share with you the cause of bearing rings, hoping to help you.

1. If the excavator bearing is in a good state of continuous rotation, it will emit a low whine or buzzing sound.
Sharp hissing, squeaking and other irregular sounds often indicate that the bearing is in poor continuous rotation.
The shrill squeaking noise may be due to improper lubrication.
Improper bearing clearance can also cause metallic sound.

2. The dent on the outer ring track of the excavator bearing will cause vibration and cause smooth and crisp sound.

3, if there is intermittent noise, it means that the rolling parts may be damaged.
This sound occurs when the damaged surface is rolled, and contaminants in the bearing often cause a hiss sound.
Serious excavator bearing damage will produce irregular and huge noise.

4. If the knocking scars caused by installation also produce noise, the noise will vary with the speed of the bearing.


Excavator bearing fittings



Loud metal noise

Reason 1: Abnormal load. Countermeasures: Study the excavator bearing clearance, adjust the load, and correct the shell shoulder position.
;

Reason 2: Poor installation.
Countermeasures: machining precision of shaft and shell, improve the installation precision and installation method.


Reason 3: Insufficient or inappropriate lubricant.
Countermeasures: supplement lubricant, choose the right lubricant.


Reason 4: Rotating parts have contact.
Countermeasure: Modify the contact part of the curved circuit seal.
;

Rules of the noise

Reason 1: indentation, rust or scars on the rolling surface caused by foreign bodies.
Countermeasures: replace the bearing of the excavator, clean the relevant parts, improve the sealing device, and use clean lubricant.

Reason 2:(after steel carburizing) surface deformation.
Countermeasures: replace the bearing, pay attention to its use.

Reason 3: raceway surface peeling.
Countermeasures: replace bearings.


Irregular noise

Reason 1: Too much clearance.
Countermeasures: Study the fit and excavator bearing clearance, modify the pre-load.

Reason 2: Foreign body invasion.
Countermeasures: replace the bearing, clean the relevant parts, improve the sealing device, use clean lubricant.

Reason 3: Spherical injury and dissection.
Countermeasures: replace bearings.

30 kinds of reasons for the sound of excavator bearings

1. The grease has impurities;

2. Insufficient lubrication (the oil level is too low, improper storage leads to leakage of oil or grease through the seal);

3. Excavator bearing clearance is too small or too large (production plant problem);

4. The bearing is mixed with sand or carbon particles and other impurities to play the role of abrasive;

5. The bearing is mixed with water, acid or paint and other dirt to play a corrosive role;

6. The bearing is clamped flat by the seat hole (the roundness of the seat hole is not good, or the seat hole is distorted and not straight);

7. The bottom surface of the excavator bearing seat is uneven (leading to the deformation of the seat hole and even the crack of the bearing seat);

8. There are sundries in the bearing seat hole (residual chips, dust particles, etc.);

9. Eccentric sealing ring (encounter adjacent parts and friction);

10. The bearing is subjected to extra load (the bearing is axial compression, or there are two fixed end bearings on one shaft);

11. The match between the bearing and the shaft is too loose (the diameter of the shaft is too small or the set sleeve is not tightened);

12. The clearance of the bearing is too small and it is too tight when rotating (the tightening sleeve is too tight);

13. Excavator bearing noise (roller end face or steel ball slip);

14. Excessive thermal elongation of the shaft (bearing is subjected to statically indefinite axial additional load);

15. The shaft shoulder is too large (it touches the seal of the bearing and causes friction);

16. The shoulder of the seat hole is too big (the seal of the bearing is distorted);

17 labyrinth sealing ring clearance is too small (friction with the shaft);

18. The teeth of the lock washer are bent (touching the bearing and causing friction);

19. The position of the oil swing ring is not appropriate (touching the flange cover and causing friction);

20. Pressure pits on the steel ball or roller (caused by hammering the bearing during installation);

21. Excavator bearing has noise (interference from external vibration source);

22. The bearing becomes discolored and deformed when heated (caused by removing the bearing by heating with a spray gun);

23. The actual fit is too tight because the shaft is too thick (resulting in excessive bearing temperature or noise);

24. The diameter of the seat hole is too small (resulting in too high bearing temperature);

25. The diameter of bearing seat hole is too large and the actual fit is too loose (the bearing temperature is too high and the outer ring skids);

26. The bearing seat hole is enlarged (the bearing seat hole of non-ferrous metal is enlarged or enlarged due to thermal expansion);

27. Cage fracture;

28. Rusty of excavator bearing raceway;

29. Wear of steel ball and raceway (unqualified grinding or product damage);

30. Unqualified ring raceway (factory problem).

Precautions for excavator bearing storage

1. Keep the original package and do not open it at will. If it is found that the package is damaged, it must be opened and cleaned carefully and reoiled for packaging.

2. The relative humidity of the storage room can not exceed 60%, and the temperature difference can not be too large. The excavator bearing in the original package can be stored for several years.
Sealed bearings or bearings with dust cover may have lower lubrication characteristics of grease filled in bearings after long-term storage.

3, the storage room should also be shockproof and shaking.
The bearings not stored in the original package should be properly stored. It is forbidden to put the bearings together with corrosive things to prevent corrosion and pollution.

4. When large rolling excavator bearings are stored, they can only be placed flat, and the sides of the inner and outer rings are best supported.
If stored upright, permanent deformation may occur due to heavy inner and outer ring and rolling parts and relatively thin inner and outer ring walls.