The maintenance of the crane needs to be carried out part by part. In this issue, Shandong Hongfu Technology Co., Ltd. will introduce to you how to maintain the crane.

1. crane axle and bearing maintenance

(1) Journal inspection: the ovality and conicity of the journal after maintenance shall not exceed 0.03mm;

(2) Crack inspection: check the shaft with magnetic or ultrasonic flaw detector. There shall be no crack on the shaft, and the scratch depth shall not exceed 0.03mm;

(3) Overhaul of rolling bearing: the axial clearance between inner ring and outer ring of tapered roller bearing is 0.03? 0.18mm。 The adjustment clearance of bearing gland shall be within 0.5? Within 1.5mm.

2. crane gear and reducer maintenance

(1) Disassemble the reducer and check the gear grinding condition;

(2) Tooth surface inspection: the wear of the * * * shaft gear of the reducer of the lifting mechanism shall not exceed 10% of the tooth thickness, and the rest shall be less than 20%; The gear on the reducer * * * shaft of the operating mechanism of large and small vehicles is not worn. It shall be more than 15%, and the rest shall be less than 25%. If the pitting corrosion on the tooth surface damages 30% of the meshing surface and the depth reaches 10% of the original tooth thickness, the gear shall be scrapped. There shall be no crack or gear fracture on the gear teeth. Otherwise replace

(3) Maintenance of shaft: there shall be no crack on the shaft, the total length of the shaft shall not exceed 0.03mm/m, and the exceeded standard shall be straightened.

(4) The joint surface (split surface) of the reducer box shall not be scratched, collided or severely scratched at any part, with high edge, flange rotation, etc., and the gap after splitting shall not be greater than 0.03mm and ensure no oil leakage. Parallelism shall not exceed 0.5 mm above 1 m;

Under no-load condition, the driver shall be driven at the speed of 1000r/min, and the forward and backward shall not be less than 10 minutes respectively. During starting, the motor shall be free from vibration, impact and abnormal or intermittent abnormal sound.

The temperature rise in the box shall not exceed 70 ° C, and the * * * temperature shall not exceed 80 ° C; The temperature rise of the bearing shall not exceed 40 ° C and the * * * value shall not exceed 80 ° C.

3. crane coupling maintenance

(1) Tooth surface inspection of tooth coupling;

(2) Check the swing of the inner and outer gear ring end faces relative to the middle line;

(3) When the middle line of the shaft is not inclined, check the radial displacement of the coupling device;

(4) Check the deflection angle of the outer ring line caused by different cores of the two couplings without radial displacement;

(5) The radial displacement of the tooth type coupling connected to the intermediate shaft (1) can be referred to the reference section.