Names and technical standards of individual parts of single beam crane (II)

This paper will briefly introduce the major repair items and technical standards of wheels, wheel shafts and bearings of single beam crane.

5 wheel

1.  Wheel tread wear
2.  Diameter deviation of two matching wheels
3.  The rim is worn, broken and deformed
4.  Wheel crack
5.  Tread ovality
6.  Wheel set assembly
   1.  when the wear of wheel tread exceeds 15% of the original thickness, it shall be replaced with a new part. If it does not exceed this value, it can be re turned and repaired by heat treatment. The wheel diameter shall be within the tolerance range, the surface quenching hardness shall be hb300 ~ 500, and the wheel diameter shall be greater than Φ The quenching layer thickness of 400mm shall be greater than 20mm; less than Φ When 400mm, the quenching layer thickness shall not be less than 15mm.
   2.  The diameter deviation of the driving wheel shall not exceed 0.1% of the nominal diameter, that of the driven motor car wheel shall not exceed 0.2%, that of the electric hoist wheel shall not exceed 1% of the nominal diameter, and that of the driven motor car wheel shall not exceed 0.2%; The wheel diameter deviation of electric hoist shall not exceed 1% of the nominal diameter
   3.  If the wear amount of the rim reaches 50% of the original thickness or the broken area exceeds 30mm2, it shall be scrapped, and if the bending deformation of the rim thickness reaches 20% of the original thickness, it shall be scrapped.
   4.  The wheel shall be scrapped if cracks are found
   5.  If the ovality of wheel tread reaches 1mm, it shall be scrapped
   6.  The installed wheel assembly shall be able to rotate flexibly by hand. Several wheels installed on the same balance frame are in the same vertical plane, and the allowable deviation is 1mm

6 wheel axle and bearing

1.  Maintenance of Journal
2.  Crack repair
3.  Maintenance of rolling bearing
4.  Inspection of pulley bearing clearance
5.  Shaft key clearance inspection
   1.  the ovality and conicity of the journal after overhaul shall not be greater than 0.03mm
   2.  Check the shaft with magnetic or ultrasonic flaw detector. There shall be no cracks on the shaft and the scratch depth shall not exceed 0.03mm
   3.  Axial clearance within the range of 0.03 ~ 0.18mm is allowed between the inner and outer rings of tapered roller bearing. The adjustment clearance of bearing gland shall be within the range of 0.5 ~ 1.5mm
   4.  The allowable clearance between shaft and bearing bush (mm) is shown in table a
      • Journal driving shaft clearance driven shaft clearance
      • 20~40 0.6 1.2
      • 40~90 0.8 1.6
   5.  The allowable radial clearance between shaft and key (mm) is shown in table B
      • The shaft diameter is 20 ~ 40, and the allowable radial clearance is 0.1 ~ 0.3
      • 41~90 0.1~0.4
      • The allowable lateral clearance between keyway and key (mm) is shown in table C
      • The shaft diameter is 20 ~ 40, and the allowable radial clearance is 0.1 ~ 0.2
      • 41~80 0.2~0 >80 0.3~0.5