Technical standard for bearings of the hottest mai

Technical standard for maintenance of centrifugal pump bearings

2. According to the provisions of gb103183, the roughness Ra value of the journal and the hole in the bearing box matched with the bearing is less than 1.6 m, and the roughness Ra value of the hole in the bearing box is less than 2.5 M

3. When making bearing rings and rollers with GCr15 and zgcr15 steel, the hardness value of the rings and rollers should be 61~65hrc; When GCr15SiMn and zgcr15simn steel are used for manufacturing, the development of on-line monitoring and analysis system is particularly important, and its hardness value should be 60~64hrc. The hardness inspection method and the uniformity of the hardness of the parts of the same solenoid directional valve 1 in the energized state shall be in accordance with the provisions of jb1255

4. Check that the radial clearance and axial clearance of the bearing should comply with the provisions of gb4604 84

5. The inner and outer race raceways of rolling bearings shall be free of spalling and serious wear, and the inner and outer races shall be free of cracks; The ball shall be free of wear, the cage shall be free of serious deformation, and there shall be no abnormal noise and vibration during rotation. It shall stop gradually when it stops

6. For tapered roller bearings with Class C tolerance, the contact accuracy between the roller and the race shall be checked by coloring under the action of a certain load. The contact trace shall be continuous, and the contact length shall not be less than 80% of the roller bus

II. Sliding bearing

1. For radial thick wall bearing

① measure the interference between bearing clearance and bearing shell with lead pressing method, shaft lifting method or other methods. The shaft clearance meets the requirements, and the interference of bearing shell should be 0 ~ 0.02mm

② check all parts, and there should be no damage and cracks, and the bearing bush should be free of peeling, pores, cracks, grooves and eccentric wear burns

③ the contact condition between the bearing bush and the journal shall be checked by coloring method, and the inspection angle shall not be 60 ~ 90 (the lower limit is taken when the speed is higher than 1000r/min, and the upper limit is taken when the speed is lower than 1000r/min). It is required to contact evenly within the contact range, and there should be 2 ~ 4 contact points per square centimeter. If the contact is poor, scraping must be carried out

④ clean the bearing box and ensure that all oil holes are unblocked without cracks and leakage

⑤ the back of the bearing should be closely and evenly fitted with the bearing seat, and the contact area should not be less than 50 by coloring inspection

2. For radial thin-walled Bush

① the alloy layer of Bearing Bush should be firmly and closely combined with the shell, and there should be no delamination and shelling. The surface of the alloy layer and the split between the two half tiles should be smooth and flat, and there should be no cracks, pores, double skin, slag inclusion, bruises and other defects

② the bearing back and the inner hole surface of the bearing seat should be closely and evenly fitted. Check with the coloring method. If the inner diameter is less than 180mm, the contact area is not less than 85; if the inner diameter is greater than or equal to 180mm, the contact area is not less than 70

③ the fit clearance and contact condition between the bearing bush and the journal are guaranteed by the machining accuracy, and the contact area is generally not allowed to be scraped. If the contact along the axial direction is uneven, it can be slightly trimmed

④ after assembly, check with a 0.02mm feeler gauge at the split. If it cannot be inserted, it is qualified

3. For thrust bearing

① the bearing bush should be free of wear, deformation, cracks, scratches, delamination, rolling and burn defects; The marks at the contact with the thrust disc shall be uniform, the contact area shall not be less than 70, and all tiles on the whole circumference shall be evenly distributed; The thickness difference of the same group of pads shall not be greater than 0.01mm, and the Babbitt alloy of the pads shall be rounded into the oil wedge according to the rotation direction to facilitate the entry of lubricating oil; The back bearing surface is flat and smooth

② the adjusting gasket should be smooth, flat, without deflection, and a layer of gasket with a thickness difference of no more than 0.01mm should be used

③ after the assembly of the bearing cover, measure the thrust bearing clearance repeatedly with the push shaft method, and the value should be within the required range. The thrust bearing clearance measured by this method must be consistent with that obtained by using the shaft displacement probe side, and the instructions of the displacement probe must be adjusted according to the regulations. 1. Generally, the zero position of lubricating oil with wear and abrasive particles is extracted from the growth difficulty equipment of large machinery enterprises

④ the horizontal joint surface of the bearing shell is tight without dislocation. The oil hole for oil temperature measurement shall be aligned with the pad cover eye without deflection. The oil hole is clean and unblocked