Assembly of blast furnace blower sliding bearings

As the heart equipment of the blast furnace, the blast furnace fan has high technical requirements in the field assembly. In the field construction of the fan, if the sliding bearing assembly is improperly handled, the light will cause the unit to vibrate, and in severe cases, it will bring the burning tile and damage the balance of the rotor.

The author has been responsible for the on-site construction work of the blast furnace fan. Combined with the situation of the D2100 centrifugal blower equipment constructed by Xi'an Jiaotong University Saier Pump Co., Ltd. in 2003, the problems and experience of the sliding bearing assembly are summarized for reference by the relevant peers.

2 unit sliding bearing situation

The structural dimensions of the unit sliding bearing are shown in Table 1:

3 sliding bearing related assembly requirements

3.1 Assembly requirements for sliding bearing housings

The bearing seat and the bottom plate of the equipment are positioned by pins, the connecting bolts must be tightly pressed to make the contact uniform, the contact area should be 75%, and the fixing is firm. When the equipment is running, the relative displacement of the bearing seat is not allowed. After the device is aligned, attach a fixed positioning pin.

It is especially emphasized that the steel locating pin on the motor bearing housing should be replaced with a rigid nylon insulated locating pin to prevent the shaft current generated during the operation of the equipment from damaging the bearing alloy surface.

Considering the thermal expansion factor, the air inlet end of the fan is pressed with a single pad and double nut, and the air outlet end is double-padded and double nut fastened to the bearing seat and the equipment base only has a gap of 0.05 to 0.10 mm.

3.2 bearing and bearing housing coaxiality assembly requirements

Use a scraper or oil stone to polish the burrs and rust on the mating surface of the lower bushing and the bearing housing. The coloring method is also used to check the contact condition (when the equipment is running, the bearing bush diameter is too small, the bearing bush will vibrate in the bearing housing; if the bearing bush diameter is too large, forcible pressing will cause the bearing bush to deform).

The tile back of the fan is generally cylindrical, the lower tile has three adjustment pads, and the upper tile has one adjustment pad. If necessary, adjust the gasket of the tile back to ensure uniform contact of the fixed liner, and the contact area is not less than 75%.

For more information and purchase please visit: https://www.supplyforever.com

Talking about: roughly classified classification of brick machine bearing lubricant

      Brick machine bearing lubricant can be roughly divided into two categories: lithium base and calcium base.

      Bearing lubricants can be broadly divided into two categories: lithium-based and calcium-based. Calcium-based grease - a calcium soap thickened mineral oil made from animal and vegetable fats and lime. Lithium-based grease - a low-condensation point lubricant thickened with natural fatty acid lithium soap. Lithium-based and calcium-based lubricating oils have excellent water resistance, mechanical stability, chemical stability, and thickening ability of lithium soap. After adding extreme pressure agent, anti-rust and other additives to the grease, various kinds are made. Long life fat. Brick machine bearings use harsh environments, long time, heavy load, and difficult maintenance. Therefore, most of them use lithium-based lubricants.

       In the use of lithium molybdenum oxide based lubricants should pay attention to:
       1. Molybdenum disulfide has good water resistance, good mechanical stability and pressure resistance, and is mainly used for mechanical lubrication of heavy loads.
       2. Molybdenum disulfide has a certain corrosive effect on copper and its alloys. It is not suitable for transportation with copper pipes, which will lead to blockage of pipelines and cause oil shortage accidents.
       3. Worm gears that are not suitable for copper alloy manufacturing will cause broken teeth due to corrosion.
       4. It is not suitable for the rolling bearing of copper alloy as the cage, which will cause the cage to break due to corrosion.
       5. When parts of copper and its alloys need to be lubricated, it is best not to use lubricating products containing molybdenum disulfide. This is a lot of equipment accidents to teach

For more information and purchase please visit: https://www.supplyforever.com