Gear pump maintenance of various components

When the gear pump parts appear serious wear and tear, how to repair it Now Xiaobian will introduce gear pump shaft, pump body, two end caps and other parts after wear repair method. Maintenance of gear pump components 1. Gear pump shaft wear repair Gear pump shaft wear is mainly due to friction between the shaft ends and support needle roller wear, so that the smaller shaft diameter. If it is slightly worn, the shaft can be enlarged by plating a hard chrome to make the shaft repaired. If the shaft wear serious, 45 steel or 40cr steel should be re-manufactured, the rough rough shaft, fine car, the bearing parts to be heat treated, the hardness hrc60-65, and then grinding, so that the bearing surface roughness ra parts do not Greater than 0.32μm; shaft circularity and cylindrical tolerance of 0.005mm; with the gear with h7 / h6, the surface roughness ra should not be greater than 0.63μm. 2. Gear pump body wear repair Pump body surface wear is mainly oil-absorbing section arc-shaped face. If there is slight wear, grinding stone can be used to burr deburring. The pump body is made of cast iron casting blank, severe wear and tear should be replaced when the new pieces. If both ends of the gear in the pump are repaired by grinding, the width of the pump should be changed to the same size as that of the two ends of the gear. The two ends of the pump after reworking should meet the technical requirements as shown in Fig.3. 3. Gear pump after the wear of both ends of the cover gear pump gear cover made of wear and tear, the phenomenon of wear, slightly flat grinding flat, wear more serious grind surface grinding machine. After grinding the end cap and the pump body with the connection plane contact should not be less than 85% flatness tolerance, the end of the hole centerline vertical tolerance, the tolerance of the parallelism of both ends and the center of the two axis hole The parallelism tolerance of the line is o.olmm. After grinding the surface roughness ra should not be greater than 1. 5μm. 4. Gear pump needle roller bearings repair replacement parts in the pump repair, the needle roller bearings should be replaced. Needle on the needle is: the size of the needle roller diameter error should not exceed 0.003mm, the length tolerance of 0.1mm, and the shaft with the gap should be around o.olmm; needle roller assembly according to the number of requirements filled bearing shell, Needle roller to be arranged parallel to each other. Extended reading: China Construction Water Expo Guangzhou World Expo pump manufacturers ranked Industrial Internet (Xiamen) Technology Co., Ltd. Asia Pump Network Editor: He Daohui (QQ / WeChat:) http://beng.liuti.cn/ (Service Hotline:)

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