Open-wheel Set: wheel, axle , axile bearung. Technical conditions execute JB/T6992-1993.
1. Before wheel set assembly ,should clean the iron filings and blockage and cleaning all parts; during bearing assembly, should adopt no shock load method; After loading bearing, wheel rotation should be flexibility.
2. Surface heat treatment hardeness of wheel set tread of≥40HRC.
3. Wheel set seals should be tight and reliable.
Assembling Requirements
Before assembling,all the parts should be inspection qualified.
All parts should be clean, and assembly in a clean environment.
Assembled dimension deviation: the total width of mine material car and the high traction deviation of ± 3 mm, total high deviation of ± 8 mm, length deviation of ± 10 mm.
Trunk installed symmetrically to the longitudinal centre plane of the frame, the symmetry tolerance to 5mm.
Assemble mine car should be placed in a special straight road to check, and does not allow a clearance between wheel and rail is greater than 2mm.
Closed Wheel Set
Grease, dirt, the scrap iron and blockage should be removed before attempting assembling.
Wheel should not appear crack, 10 mm in length range appeared on top of the rim and the end part of the profile of tiny crack, should not be more than two.
Tread should not be welded,except within the following:
a) Each of the small dense surface pinholes and hemp holes which the diameter less than 1mm,depth less than 2mm , should not exceed 225mm2, the total area should not exceed 900 mm2;
b) The amount of pores that diameter and depth within 3 mm , sand holes, slag shall not exceed six, distance from each other in more than 30 mm.But distance unlimited when diameter and depth exceed 2mm;
c) The cold shut that length does not exceed 400mm, the width does not exceed 2mm, depth does not exceed 1mm .
Surface defects such as trachoma, porosity of round hole,that the area smaller than 16 mm2, the depth is less than 3 mm, 30 mm apart or more, shall not exceed three.
To die casting wheel, the round beating quantity of the wheel diameter D should not be larger than 1 mm;To sand casting wheel, the circular runout amount should not be larger than 0.5 mm.
The wheel after normalizing organization should not shown network structure, its grain size should not be larger than 6.
Coaxial degree of axle bearing installed omply with the provisions of the figure below.
Unit: mm
| Diameter |
50 |
55~80 |
| Coaxial Degree |
0.04 |
0.06 |
Connection device is composed of connection three-ring chain, bolt.
Connection three-ring chain conforms with the standard requirements of" MT 244.1 - 2005 coal mine narrow gauge vehicle fittings connection chain ".
Connecting pin conforms with the standard requirements of"MT 244.2-2005 mine narrow gauge vehicle connector connecting pin".
Bumper technical conditions in accordance with JB/T6992-1993
Buffer has enough strength, cushioning material toughness value of not less than 30J/cm2,cast steel bumpers there shall be no crack, on the surface of cast steel bumper bolt hole and end face not allowed any defects and shall not carry out welding.
