Bearings are important parts of wear-resistant multi-stage centrifugal pumps used in coal mines. They are also responsible for the overall rotation of the pump operation. They are also parts that are prone to damage. If you do not pay attention to maintenance and maintenance, pay attention to disassembly, distortion and damage will occur. Otherwise, the centrifugal pump will stop running, and the motor will be burned out in severe cases, and the pump casing will be broken.
Maintenance of wear-resistant multi-stage centrifugal pump bearings for coal mines
1. For newly put into use pumps, grease (oil) must generally be replaced after 100 hours of operation, and once every 500 hours of operation thereafter.
2. The fluid bearing is lubricated with grease. After 1500 hours of operation, the grease should be replaced. The amount of oil added should not be too much or too little, because too much or too little grease will cause the bearing to heat up. The amount of oil added is generally controlled by 1/2 to 2/3 of the volume of the bearing chamber is appropriate.
Wear-resistant multi-stage centrifugal pump bearings for coal mines
3. For bearings lubricated with lubricating oil, the amount of oil should be added to the specified position.
4. The container containing lubricating oil or grease should be clean, and should be sealed in normal times, and there should be no dust, iron filings and other debris to avoid damage to the bearing
5. Motor bearings generally use sodium-based grease. This grease is characterized by high temperature resistance (125°C), but it is easily dissolved in water, so it cannot be used for the lubrication of water pump bearings.
Problems to be paid attention to when disassembling and assembling wear-resistant multi-stage centrifugal pump bearings for coal mines:
(1) The drag force should be continued to the extent it should be. For example, when installing the bearing, the screw pump should stop applying force when the bearing is just installed in the correct position to ensure that the end surface of the ring (washer) abuts against the seat hole or the shoulder of the shaft. The end face can neither be squeezed too tightly nor installed in place.
(2) The resultant force of the applied force passes through the axis of the oil-free bearing as much as possible. For plastic pumps, the force application point is required to be uniform, symmetrical and stable, and force applied through a spherical surface or parallel to the axis.
(3) Avoid applying force through rolling elements. For diaphragm pumps, this requires force through the inner ring when assembling and disassembling the inner ring (shaft ring), and force through the outer ring when assembling and disassembling the outer ring.
(4) The applied force should be stable and uniform, and should not have impact. The self-priming pump requires the use of oil pressure or tools that can apply a stable pulling force or pressure. When hammering is really necessary, it must be passed through a copper sleeve, etc. Softer metal without falling chips is cushioned, and the percussive force is as gentle as possible. It is best to use a copper rod or copper hammer for hammering.
