Generally, it is more objective to judge the severity of the rail by the amount of wear of the wheel rim. The wear of the rim is greater than 1 mm, which is a serious rail and must be repaired.
Adjustment of the cart transmission mechanism: the bridge cranes driven separately, the bearings and brakes of the two groups of drive mechanisms should be adjusted to the same degree of tightness. If the gear unit and the coupling transmission parts are replaced, it is advisable to replace both sides at the same time. The motors of the two carts should be the same parameter of the same model.
The clearance of tapered roller bearings should be the same: the axial clearance of tapered roller bearings should be in accordance with the table.
Adjustment of vertical deflection of large and small wheels: The vertical deflection value a of the size wheel, that is, the distance from the lower end of the measurement length L to the vertical line, should not exceed L/350. The vertical deflection direction of the wheels on both sides should be "V", that is, the upper part of the wheel should be outward, and the wheel will approach vertical when the bridge crane is loaded. In order to correct the vertical deflection value a of the wheel, it should be solved by padding between the angle box and the horizontal positioning key or the horizontal positioning and the end beam bending plate. Which side of the wheel is to be padded according to the direction of deflection of the wheel, if the wheel is biased to the right, padding on the left side; otherwise, padding on the right side. The thickness of the pad when padding is calculated as follows: t = Ba / L. Where: B-wheel bearing box center distance; a-vertical skew value; L-measure length. When adjusting, if the positioning bolt of the bearing housing cannot be worn, the bolt hole on the curved plate can be enlarged. After adjustment, the positioning key and the adjusting pad should be spot welded on the end beam bending plate.
Adjustment of the horizontal deflection of the wheel: the measurement of the horizontal deflection of the wheel. First, find two parallel lines as the baseline to measure the horizontal skew. Horizontal skew adjustment. The horizontal deflection value C of the wheel is specified in the table. In order to correct the horizontal deflection, the pad can be padded after the vertical positioning key of the angular bearing box, and the padding position depends on the skew direction. The thickness t of the pad is calculated by the following formula: t=BC/L. Where: B-wheel bearing box center distance; C-horizontal skew value; L-measured length.
Reduce the difference in wheel forging diameter: the difference between the diameter of a pair of active wheels exceeds 0.2% of its diameter. When the driven wheel exceeds 0.5%, it should be reworked to the same basic size. The difference between the diameter of the active wheel and the passive wheel should not exceed 3 mm.
Adjustment of wheel span, diagonal and homodyne: the deviation of the wheel span and diagonal of the cart should be no more than ±7mm; the deviation of the wheel span and diagonal of the cart should be no more than ±3mm, the wheel equidistance should not be More than 2mm. When adjusting, the wheel can be moved by reducing the side of the spacer ring of the wheel bearing and increasing the other side accordingly. Or expand the bolt holes on the end beam to the bearing housing, and move the positioning keys to adjust the span, diagonal and homolocation of the wheel.