turntables slewing rings made in china

1.Causes and treatment methods of overheating of turntables slewing rings

The overheating phenomenon of the turntables slewing rings 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 working efficiency of machinery and equipment, and may cause serious damage to the bearing, increase unnecessary capital investment, and delay the construction period, which is not worth the loss.

The cause of overheating:
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1. Poor lubrication

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

​​When the turntables slewing rings are 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 be deflected, and a moment will be generated when rotating, causing the bearing to overheat, wear, vibrate, and increase noise.
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3. Inspection and replacement are not timely

​​The bearings in operation should be checked in time. If serious fatigue spalling, oxidation corrosion, pits, cracks, etc. are found, new bearings should be replaced in time, otherwise it will cause the bearings to overheat, abnormal noise or even damage the mechanical equipment.
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4. Poor bearing quality or improper selection

​​The turntables slewing rings 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 do not match the equipment. , may cause overheating.

2. Processing method
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1. Purchase bearings with good quality and matching models

​​When purchasing turntables slewing rings, we must strictly control the quality, and comprehensively consider factors such as the nature, size, temperature conditions of the bearing load, and the rotation shape of the inner and outer rings according to the equipment requirements to ensure that the model matches.
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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.
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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.
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4. Timely check the running condition of the turntables slewing rings

​​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.

2.How does slewing ring paint rust form? How to prevent?

First, the cause of the formation of bearing paint rust
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Generally, the slewing ring with paint rust is generally on the end face near the inner side of the motor, and will be seriously rusted. The grease near the edge of the inner and outer rings will first deteriorate, generally yellowish brown.

The reason for the formation of bearing paint rust refers to the fact that during the bearing paint rust test, it was found that the severity of bearing paint rust was closely related to the humidity. Most of the paint rust occurs in the south or the coast to coincide with the imagination of the annual rainy season.
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1. The climate environment is high temperature and high humidity.
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2. The stator drying is incomplete;
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3. Motor bearings are sealed and packaged in storage;
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4. The severity of paint rust mainly depends on the composition of the paint base.
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5. Prevention of paint rust (bearing seal and rust prevention, type of grease).

 

Second, the prevention method of bearing paint rust
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The prevention of slewing ring paint rust must be considered in terms of its mechanism, from the design and manufacture of motors, insulation and bearings. We organize the preventive measures as follows:
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1. Avoid complete sealing and open air holes as much as possible;
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2. The manufacture of traditional Chinese medicine must ensure the drying time of insulating paint. After the stator is dried, it should be placed in a ventilated place for natural ventilation, so that the paint gas can be completely released. The stator should follow the principle of first-in, first-out during use.
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3. During the storage process of the warehouse, it is not close to the walls and corners, and pallets are used on the ground to ensure ventilation, and the humidity should be less than 70%RH as much as possible.
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4. Use stable insulating varnishes (such as epoxy solvent-free insulating varnishes) that do not escape low molecular acid, and produce them in strict accordance with the production process requirements.
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5. When selecting grease, use mineral oil as the base oil.
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6. Sealed bearings are used.