Centrifugal fan causes high bearing temperature

1. Poor lubrication, deterioration of oil (fat) or lack of oil (fat).

2. The assembly quality of the bearing is poor, the pre-tightening force is too large, and the working clearance is small.

3, the bearing itself is of poor quality, such as the original clearance is not required, or the roller or ferrule is defective.

4, the fan vibration large bearing withstand the impact load.

5, the bearing cooling is not good, ventilation or water shortage is insufficient.

The selection of the centrifugal fan bearing, the unit of use will generally be replaced according to the original model of the equipment manufacturer, without paying much attention to whether the selection is appropriate, from the above examples, it is caused by improper selection of bearings. Because the shaft and bearing of the centrifugal fan are generally selected with H7/js6 (or H7/k6), the matching between the bearing and the bearing housing hole is generally JS7/h6. This kind of cooperation is not too tight, and the impact on the bearing clearance is limited. For centrifugal fans with higher rotational speed and higher working temperature, the tightening of the connecting bolts of the bearing seat and the upper cover is generally not carried out by torque. In order to prevent loosening, the tightening force is often too large, so that the working clearance becomes variable. Small, which causes the bearing to heat up and cause high temperature; or because the bearing working clearance is small, the free end bearing can not automatically move with the thermal expansion of the shaft, so that the axial load of the two bearings is too large, causing the bearing to heat damage. Therefore, when replacing the bearing in production, especially the bearing of the centrifugal fan with higher speed and higher working temperature, pay attention to the selection of the bearing. First, pay attention to whether the limit speed is suitable. Second, choose C3 with large original clearance. Group bearings.
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8 major precautions for laser engraving machin

The use of laser engraving machines can improve the efficiency of engraving, reduce the temperature of the non-metallic materials being carved, and reduce the deformation and internal stress of the engraved objects.

 

So what issues should you pay attention to when using the laser engraving machine? The author has compiled 8 notes and hopes to help everyone.

 

First, after each boot, it is necessary to check whether the submersible pump can discharge water. If it does not discharge water, it is forbidden to start the work: and ensure that the circulating water has moderate water temperature and water quality, it must be free of impurities and change the circulating water regularly.

 

2. When using the eagle, you must turn the fan over to avoid contaminating the lens and focusing mirror.

 

3. It is strictly forbidden to place flammable or explosive materials on the left side of the equipment; when the machine is working, it is necessary to cover the top cover of the machine to prevent laser misalignment from causing fire or injury.

 

4. When the voltage is unstable, stop the power on. If there are special conditions, use a voltage regulator.

 

5. During the working process, the operator must check the working condition of the machine at any time, such as whether the paper laid on the hook can be blocked by the air pump, the abnormal sound of the machine, the water temperature of the circulating water, and so on.

 

6. The environment in which the machine is located is free of pollution, no strong electricity, strong magnetic interference, etc.

 

Seven, the continuous use of laser engraving machine working time should not exceed 5 hours, the machine needs half an hour in the middle.

 

8. It is forbidden to turn on the maximum state of the ammeter to avoid breakdown of the laser power.