Technical standard for gear, reducer and coupling of single beam crane (III)

Single beam crane is composed of many parts, including gear and reducer coupling, etc. what technical standards do these parts have and what inspection should be done? The following is a brief introduction to the names of individual parts and technical standards of mine cranes.

7 Single beam crane gear and reducer

1.  Disassemble the reducer, clean and check the gear grinding condition
2.  Tooth surface inspection
3.  Maintenance of shaft
4.  Maintenance of bearing
5.  Assembly inspection
   1.  Center distance: measure the center distance of gear with micrometer or special vernier caliper
   2.  The clearance between tooth side and tooth top can be measured by pressing lead wire
   3.  Maintenance of meshing area
6.  Operation test
   1.  the gear wear on the first shaft of the reducer of the lifting mechanism shall not exceed 10% of the tooth thickness, and the rest shall be less than 20%; The wear of the gear on the first shaft of the reducer of the trolley running mechanism shall not exceed 15%, and the rest shall be less than 25%.
   2.  When the tooth surface pitting damages 30% of the meshing surface and the depth reaches 10% of the original tooth thickness, the gear shall be scrapped, and the gear teeth shall not have cracks or broken teeth. Otherwise, replace it.
   3.  There shall be no cracks on the shaft, and the total bending length of the shaft shall not exceed 0.03mm/m. If it exceeds the standard, it shall be straightened.
   4.  Allowable deviation of radial clearance of bearing after overhaul (unit: mm)
      1. Allowable clearance of shaft diameter and inner diameter
      2. 17~30 0.02
      3. 35~50 0.03
      4. 55~90 0.04
   5.  During assembly, check the following three items: center distance, tooth side clearance and meshing area deviation (mm)
      1.  Allowable deviation of center distance
         • Center distance < 100 ~ 200 250 ~ 400 > 500
         • Allowable deviation ± 0.07 ± 0.09 ± 0.12 ± 0.15
      2.  The allowable deviation of tooth side clearance and tooth top clearance is 0.25m, m-modulus
         • Center distance 80 ~ 120 ~ 200 200 ~ 300 320 ~ 500 500 ~ 800
         • Tooth side clearance 0.13 ~ 0.26 0.17 ~ 0.34 0.21 ~ 0.4 026 ~ 0.53 0.34 ~ 0.67
         • Center distance 80 ~ 120 ~ 200 200 ~ 300 320 ~ 500 500 ~ 800
      3.  Check with red lead. The meshing area shall not be less than 45% of the tooth height and 60% of the tooth width
   6.  The joint surface (split surface) of the reducer box shall not be smashed, bumped and seriously scratched at any part, high point of the edge, flanging, etc., and the clearance after the split surface is fitted shall not exceed 0.03mm, and no oil leakage shall be ensured. Parallelism above 1m shall not be greater than 0.5mm; Under no-load condition, the motor shall be driven at 1000r / min, and the forward and reverse rotation shall not be less than 10 minutes respectively. During startup, the motor shall not have vibration, impact and violent or intermittent abnormal sound; The temperature rise in the box shall not exceed 70 ℃, and the absolute temperature shall not be higher than 80 ℃; The temperature rise of bearing shall not exceed 40 ℃, and its absolute value shall not exceed 80 ℃

8 Single beam crane coupling coupling

1.  Maintenance of tooth surface of gear coupling
2.  Inspection of swing of inner and outer gear ring end faces to centerline
3.  When the center line of the shaft is not inclined, check the radial displacement of the coupling installation
4.  When there is no radial displacement, check the skew angle of the outer ring turning line caused by the non concentricity of the two couplings
5.  The radial displacement
   1.  of the coupling in the form of teeth connected by the intermediate shaft can be referred to in the section
   2.  Allowable swing of inner and outer ring end faces (mm)
      • Diameter D
      • Allowable swing 40 ~ 100 ~ 200 200 ~ 400 400 ~ 800 80 ~ 120000
      • ±0.01 ±0.02 ±0.0 ±0.08 ±0.120
   3.  The allowable radial displacement of two shafts is 0.4 ~ 3.2mm according to different modulus
      • Modulus (m) 2.5 2.5 3 4 4
      • Number of teeth (z) 30 38 40 48 56 62
      • Radial displacement (mm) 0.4 0.65 0.8 1 1.25 1.35 1.6 1.8
   4.  The skew angle of the internal gear ring axis is allowed to be within 0 ° 30 '
   5.  Maximum radial displacement ymax = 0.00873a, a - length of intermediate shaft measured from the center of two external teeth

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