Primary Causes and Analysis of Rail Biting in Bridge Cranes

The primary causes of rail biting in bridge cranes include the following:

Wheel Issues:

1. Unequal wheel diameters: If the two driven wheels of a bridge crane have unequal diameters,

each wheel will travel a different distance per revolution. This causes the crane body to skew,

resulting in rail biting.

2. Inaccurate wheel mounting position: Excessive horizontal or vertical deviation of wheels 

can cause rail biting. Horizontal deviation should not exceed 1/1000, and vertical

deviation should not exceed 1/400. If wheels on the same axle have inconsistent tilt directions,

rail biting may also occur.

3. Inconsistent Wheel Tightness: Uneven tightness in wheel assembly causes drive asynchrony,

resulting in body tilt and rail biting. Primary Causes and Analysis of Rail Biting.

Rail Issues:

1. Rail Installation Errors:

Non-compliant rail elevation, span, and straightness cause lateral movement during crane operation,

leading to rail gouging.

2. Oil or Frost on Rail Surface:

Oil, water, or frost on the rail surface causes wheel slippage, resulting in derailment and rail gouging.

3. Excessive Horizontal Track Deflection: When track horizontal deflection exceeds span tolerance,

it causes wheel flanges to rub against the track flange side.

Metal Structure Issues:

1. Main Girder Deformation: Reduced camber or lateral deflection of the main girder causes

imbalance in the horizontal inertial

 forces during crane operation, leading to rail gouging by the trolley or crane.
2. End beam deformation: Deformation of the end beams causes misalignment of the main crane

wheels, resulting in rail biting.
3. Diagonal structural deviation: Deformation of the truss structure formed by the main and end

beams causes the drive wheels and driven wheels to move out of alignment, resulting in rail biting.

The hazards of rail biting include:

1. Reduced service life of wheels and rails: Rail biting accelerates wear on wheels and rails,

shortening their operational lifespan.
2. Increased operational resistance: Lateral forces generated by rail gnawing increase running

resistance, placing greater load on motors and reducers, potentially causing equipment damage.
3. Structural damage: Rail gnawing induces vibration and impact in bridge cranes, leading to

loosening, fracture, or weld separation at connection points like main girders and end beams,

and may even trigger safety incidents. Primary causes of rail gnawing in bridge cranes.

HG Crane operates state-of-the-art production lines for complete machinery. Our professional

engineering team will deliver cost-effective, customized solutions tailored to your unique

requirements. We cordially invite both new and existing clients to place orders and enjoy a

collaboration experience that combines exceptional quality with outstanding value!