Bearing quality inspection operation of tips

After installation of composite bearing to check, should guarantee the bearing installed, flexible rotation, no card lag phenomenon, such as bearing improperly installed, can make the bearing temperature rise quickly and damage, even bearing jammed fracture and other major accidents.
First, the rotation of the bearing with a stethoscope and check, has the strong metal noise, such as vision, irregular note that exception.Its reason has poor lubrication, shaft or precision bearing, bearing damage, foreign body intrusion, etc.
Second, bearing temperature, average according to the external temperature of the bearing.But using the oil hole directly measuring the temperature of the bearing outer ring more accurate.The bearing temperature, starting operation gradually increases, usually 1 ~ 2 hours after the temperature stability.If the bearing installation, the temperature will rise sharply, abnormal high temperature.The reason such as lubricant, bearing clearance is too small, too much bad installation, excessive friction sealing device, etc.High-speed rotation, the choice of the ways of bearing structure, the lubrication error and so on is also the reason.
Third, the small machine can rotate with the hand, to confirm whether to rotate smoothly.Check project has caused by foreign bodies, scars, creasing seized up, due to bad installation, installation of seat processing bad moment is not stable, because the clearance is too small, installation error, seal friction caused by the torque is too big, and so on.If there is no abnormal can start power operation.
Fourth, large machines cannot manual rotation, so after no-load start immediately cut off the power, machine idle, check whether there is presence of vibration, noise, rotating parts contact, etc., confirmed after no abnormalities, into power operation.