May, 2022

The overheating phenomenon of the slewing bearing during operation is one of the common faults of the bearing. Once the overheating phenomenon is found, it needs to be stopped in time for investigation and treatment. Improper handling will reduce the efficiency of mechanical equipment, and may cause serious damage to the bearing, increase unnecessary capital investment, and delay the construction period, which is not worth the loss. So what are the reasons for the overheating of the slewing bearing? How to deal with it? Next, the editor of Hengguan will give you a detailed introduction.

1. The cause of overheating

1. Poor lubrication

Good lubrication is a necessary condition to ensure the normal operation of the bearing. If the bearing grease is insufficient or deteriorated, it will increase the friction and wear of the bearing, causing the bearing to overheat.

2. Improper installation

When the bearing is installed, it is required that the center line of the shaft and the bearing hole need to be coincident. If the installation is not correct, the bearing will have deflection, and torque will be generated when rotating, causing the bearing to overheat, wear, vibrate, and increase noise.

3. Inspection and replacement are not timely

The bearings in operation should be checked in time. If serious fatigue spalling, oxidation rust, pits, cracks, etc. are found, new bearings should be replaced in time, otherwise the bearings will be overheated, abnormal noise or even damage the mechanical equipment.

4. Poor bearing quality or improper selection

The slewing bearing generally works for a long time under strong stress. The accuracy, life and reliability of the main engine largely depend on the bearing. If the bearing itself is of poor quality or improperly selected at the time of purchase, its limit speed and load capacity will not match the equipment. , may cause overheating.
Slewing bearing
2. Processing method

1. Purchase bearings with good quality and matching models

When purchasing bearings, the quality must be strictly controlled, and factors such as the nature, size, temperature conditions, and rotation of the inner and outer rings of the bearing load should be comprehensively considered according to the equipment requirements to ensure that the model matches.

2. Install the bearing according to the operating procedures

When the bearing is installed, the coordination between the inner diameter of the bearing and the shaft, the outer diameter and the outer casing is very important. In addition, the center line of the shaft and the bearing hole needs to be coincident to prevent the bearing from overheating, vibration, abnormal noise, etc. caused by wear caused by improper installation.

3. Regularly check and replenish grease

Bearings should be regularly inspected for grease. If the lubrication is insufficient, it should be replenished in time. If the grease deteriorates, it should be replaced in time. Different types of grease cannot be mixed.

4. Timely check the running condition of the bearing

Timely check whether the bearing is bitten and worn, check whether there are cracks, rust, pits and other defects inside and outside the bearing, measure whether the bearing clearance exceeds the standard, and repair or replace the new bearing in time if there is an abnormality.

Slewing bearing is a large bearing that can withstand comprehensive loads. It is widely used in many construction machinery, such as our common excavators, road rollers, etc. Bearing failure during operation is a headache for many construction machinery operators. Next, Hengguan Xiaobian will introduce to you the common failures of slewing bearings during daily operation and how to deal with them.

Common faults and solutions

1. Inflexible rotation

The inflexible operation of the slewing bearing during use is generally due to insufficient grease, damage to the sealing strip, and foreign matter entering the raceway.

Treatment method: add or replace grease, remove foreign matter and replace sealing strip. If the slewing bearing still cannot operate flexibly after taking the above measures, there may be a fault in the raceway, and it is necessary to contact the bearing after-sales service.

2. Abnormal noise

First of all, it is necessary to determine whether it is the sound from the slewing bearing. You can stop the rotation of the slewing bearing and other components operate normally to determine the source of the sound. Generally, the causes of abnormal noise in bearings include insufficient lubrication, which makes the rolling elements collide with the spacer, and foreign objects are mixed in the raceway.

Treatment method: replenish grease in time. If the sealing strip is damaged, replace it and remove the internal foreign matter. If the bolt is loose, it needs to be tightened according to relevant standards.

3. Shake

The shaking of the slewing bearing is generally due to loose mounting bolts, insufficient rigidity of the steel structure supporting the slewing bearing, and overloading operations.

Treatment method: If the bolts are loose, check all the inner and outer ring mounting bolts and tighten them as required; if the rigidity of the steel structure is not enough to produce elastic deformation, the strength of the supporting slewing bearing steel structure needs to be increased; do not overload.

4. Broken teeth

Most of the broken teeth are related to the non-standard installation. For example, the backlash of the large and small gears is improperly adjusted, which causes the two gears to mesh badly during operation, resulting in broken teeth; The mounting bolts are not tightly fixed, and the large and small gears are poorly meshed, resulting in broken teeth. In use, if overloaded and rotated at high speed, the host collides with obstacles, and foreign objects are stuck, it may also cause broken teeth.

Treatment method: When installing, adjust the backlash strictly according to the requirements to ensure that the axes of the two gears are parallel, and the bolts should be tightened as required; the operation should be carried out in accordance with the operating procedures.

The above are the common faults and treatment methods of slewing bearings in daily use of construction machinery summarized by Xiaobian. I hope it will be helpful to your operation. If you have any other questions or needs, you can leave a message or contact us by phone.

Causes and treatment methods of overheating of slewing bearing

Common faults and treatment methods of slewing bearing

Archive for month: May, 2022