As a core component of the crane's traveling mechanism, the quality of the crane's traveling wheel assembly directly impacts the crane's service life and operating efficiency. The crane wheel assembly, consisting of the wheel, axle, bearings, and bearing housing, primarily bears the crane's load and supports it, while also enabling the crane's travel and operation on the track.
Common Forms of
Crane Wheel Damage:
Wear: The surface of the crane wheel gradually becomes thinner due to friction.
Crushing of the Hardened Layer: Excessive hardness of the crane wheel material causes crushing of the surface layer.
Pitting: Small pits appear on the surface of the crane wheel.
Crane Wheel Material Selection:
Crane wheels are typically made of ZG430-640 cast steel, which undergoes a heat treatment to enhance wear resistance and hardness. The tread hardness should reach HB330-380, with a hardened layer depth of at least 20mm to enhance the crane wheel's wear resistance and impact resistance.
The Importance of Crane Wheel Horizontal Deflection:
Wheel horizontal deflection is a key technical parameter for cranes. Excessive skew can cause rail gnawing, increased operating resistance, vibration and noise, and increased track and wheel wear, significantly shortening the crane's service life. Therefore, the manufacturing standards for various crane types specify the permissible range for horizontal wheel skew.
Inspecting the
crane's traveling wheel assembly:
Inspecting the wear of the crane's wheels: Observe the degree of wear on the crane's wheel surface.
Inspecting the wheel-axle fit: Ensure a tight fit between the wheels and the axle.
Replacement requirements: When the uniform wear of the crane wheel reaches 15-20% of the original rim thickness, or the flange wear exceeds 60% of the original thickness, the wheel should be replaced.
Quality requirements for new wheels: The wheel must be free of cracks, the rolling surface must be smooth and free of unevenness, and the axle-hole fit must meet design requirements. Crane wheel assembly quality requirements: The crane wheel and axle must fit securely, with a runout of no more than 0.10mm; the wheel's vertical tilt must be no more than 1mm; the bearing planes of the two bearing housings must be parallel to the wheel's width center plane, with an error of no more than 0.07mm; and the crane wheel must be positioned so that its width center plane aligns with the symmetry center of the two bearing housings.
Following these maintenance steps, you can ensure the proper operation of the crane's traveling wheel assembly, extend the crane's service life, and improve operational efficiency.
