Weifang 250 kw generator bearing high temperature through the reason and repair method

Weifang 250 kw generator bearing high temperature through the reason and repair method 1, smooth oil unclean response: smooth change oil. 2, shaft bending, the center line is not allowed. Response: find center again. 3, in the ball or roller bearing damage. Response: a change in the new bearing. 4, root screws is loose. Response: tighten the foundation screw. 5, smooth oil use time is too long, not to change. Response: bearing to clean, smooth change oil. Diesel generator set with the bearing can be roughly divided into three categories, namely: bearing is analyzed. studying yaw bearings, bearings, transmission system, Spindle and gearbox bearing) 。 A, materials. Rules and yaw, specification is analyzed. studying choose 42 crmo bearing ring material, heat treatment of the overall conditioning treatment, after tempering hardness is 229 hb - 269 hb, raceway parts adopt appearance quenching, quenching hardness of 55 HRC - 62HRC. Due to wind turbine yaw, variable propeller bearing stress state is complex, and bearing accept compare with shock and vibration is big, therefore, request bearing can accept, and can accept large load. This bearing ring matrix hardness of hb - 229 269 hb, can receive impact than the onset of plastic deformation, and race quenching hardness reaches 55 HRC - local appearance 62 HRC, can increase the contact fatigue life, so as to ensure the using request of bearing short-lived life. Second, the impact energy at low temperature. The current specification for yaw, paddle wheel bearing ring low-temperature impact work request: - 20 ℃ Akv should not less than 27 j, under the cold Akv value can negotiate with the user. Generator may work in extremely cold area, the bearing under the condition of low temperature required can accept large impact load, thus, the request of the bearing ring data after tempering treatment of low-temperature impact experimental work, must do take a locally made samples of bearing ring or the same as the ring the same performance and heat treatment under the condition of sample. Third, bearing ring gear. As a result of the diesel generator set, the transmission accuracy is not high, and the big gear ring diameter compare, module of gear match is big, therefore, ordinary request gear precision grade according to GB/T10095. 2 - — The magnitude 9 or 10, 2001. But due to the work condition between pinion and ring gear bearing impact, therefore, bearing ring gear tooth surface quenching, small gear tooth surface hardness is common in 60 HRC, thinking to life such as design, big gear tooth surface quenching hardness rules for not less than 45 HRC. Four, anti-corrosion treatment. Generator equipment work in the field, and yaw, variable propeller bearing a partial is exposed, by atmospheric pollution, high humidity environment may also be corrosion bearing matrix, therefore, is analyzed. studying exposed yaw and bearing parts of the request to stop appearance anticorrosion treatment, common use galvanized treatment. According to the demand, on the outside of the zinc coating paint stop maintenance treatment. More than 15 kw diesel generator set electric ball mostly adopted by the single bearing. Generator bearing front because of its high load, high speed normal is to use a large single row deep groove ball bearings and double row deep groove ball bearing, the back-end using single row deep groove ball bearings.