2023-04-10
The chassis of railway freight cars is a rectangular frame composed of various longitudinal and transverse steel beams, generally consisting of center beams, side beams, sleeper beams, crossbeams, end beams, and floor crossbeams. It supports the vehicle body and is the foundation of the vehicle body. The chassis of the vehicle bears the entire weight of the upper body and load, and transmits the weight to the running gear through the upper and lower center plates.
The underframe of railway freight cars is a relatively complex steel structure, with each beam components forming an overall framework. The beams are constrained by each other, and if one part bends, it will cause deformation in other parts. During the maintenance of railway freight cars, clear regulations are made for the bending deformation and adjustment of each beam of the chassis:
◆When the sag between the middle and side beams is greater than 30mm, adjust and repair them to the horizontal line of 0~+12mm; The center beam does not exceed the limit, and while the side beam exceeds the limit, the side beam can be adjusted to the existing deflection of the center beam.
◆Upward and downward deformation of traction beam and pillow beam's outer side beam not over 20mm, otherwise repair and adjust to +-5mm with horizontal level.
◆Adjustment and repair of metal auxiliary beams with bending greater than 20mm
◆When the side bends of center beam and side beams greater than 30mm, adjustment and repair.
◆The traction beam left, right bend no more than 20mm. When exceeds the limit, repair and adjust to no more than 5mm.
◆When the expansion of the traction beam exceeds 20mm on one side or the sum of both sides exceeds 30mm, it shall be adjusted and repaired.
◆For open wagons, when side bend of upper side beam, side bend of upper end beam and vertical bend of upper side beam are over 50mm, repair and adjustment.
◆For open wagons, side column connecting block bending over 20mm, repair and adjustment.
◆The left and right height difference of same end beam is over 20mm, repair and adjustment.
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