Crane wheels generally refer to casting cranes, bin feeding cranes, slab handling cranes, steel coil clamp cranes, disk cranes and other bridge cranes serving metallurgical enterprises. In order to ensure the safe operation of the crane, the crane has put forward clear precision requirements for the diameter of the driving wheel during design. The relative difference in diameter of the corresponding set of driving wheel during design. The relative difference in diameter of the corresponding set of driving wheels running on the two tracks far apart plays a decisive role in the safe operation of the crane. When two corresponding sets of traveling wheels run on the tracks indifferent directions, the running distances per unit time are different, which will cause the asynchronous operation of the crane and affect the safe operation of the crane. Therefore, it is very important to pair the running wheels on the crane to control the relative difference in diameter of the running wheels. The relative difference in diameter of the same group of wheels should generally be controlled within 0.12-0.15mm.
The measurement of large-diameter wheels of cranes is usually carried out with large-scale micrometers. The wheel has a large diameter and heavy weight. When measuring, it often requires the cooperation of multiple people and multiple measurements. Due to a certain batch size, manufacturers have to inspect a large number of wheel forgings each year. This measurement method is labor-intensive and inefficient, and requires high proficiency and technical quality of inspectors. The measurement results are often different due to the different operations of each person. In addition, due to the complexity of the measurement process, even if it is operated by one person, the measurement of each wheel cannot be consistent. Therefore, it is difficult to effectively control the relative difference in diameter of the two wheels when the wheels are assembled. In actual production, we often encounter that when the diameter of the wheel after storage is re-measured, the size of the re-measurement is often quite different from the diameter marked on the wheel before storage. It is especially worth pointing out that after the wheels are assembled on the bridge frame, it is impossible to retest the diameter of the wheels, and it is difficult to determine whether the relative diameter difference between the two wheels in the same group can meet the technical requirements. In this way, the safe operation of the crane cannot be guaranteed.
In view of the above situation, there is a corresponding measuring tool: precision π ruler. Use the π ruler to measure the large diameter wheel of the crane, the measurement process is simple and easy to master. Only one person is required to operate, as long as the two wheels are measured with the same force, the wheels can be effectively paired to control the relative difference in wheel diameter. It is especially superior that after the wheels are installed on the bridge frame, the wheels can still be re-tested to determine the relative difference in diameter of the same group of 2 wheels, which plays an important role in the final inspection of the product and ensuring the safe operation of the crane. Commonly used crane wheel forging materials: 60#, 65Mn, 42CrMo.
Crane wheel tread damage includes road galling, tread peeling and tread wear
Crane wheel tread scratches: the form of tread scratches is related to axle load, vehicle speed, braking force and dry and wet conditions of rail surface.
Crane wheel tread peeling: The traveling wheel slides on the rails to form tread abrasions, and the treads rub against the rails intensely to generate high temperatures. After cooling, the metal on the surface of the abrasions is hard and brittle, which can easily cause small pieces of metal on the treads to fall off or warp in flakes, forming tread peeling.
Crane wheel tread loss: It will deteriorate the wheel-rail contact state, increase the impact vibration between the wheel and rail, easily damage the track, and shorten the service life of the track facilities; increase the up and down vibration of the car body, and easily loosen, break and wear the parts of the vehicle. And produce cracks, causing accidents; the impact force on the bearing is sharp and large, shortening the life of the bearing, and easily causing a hot shaft; under strong impact and vibration, it is easy to damage the transported goods; the tread wear of the wheel damages the taper of the tread, reduces the running stability of the equipment, increases the contact area of the wheel and rail, and increases the running resistance; excessive wear of the wheel tread causes the outer distance of the wheel rim to be too small, the lateral vibration of the wheel is serious, and derailment accidents are prone to occur.