employee
Moscow, Moscow, Russian Federation
graduate student
Moscow, Moscow, Russian Federation
employee
Moscow, Moscow, Russian Federation
BBK 399 Промышленный транспорт
For import substitution, it is necessary to maintain the operability of available equipment that has suffered failures, especially since the sanctions imposed by unfriendly countries do not allow receiving spare parts and components from manufacturing companies. In particular, failures of slewing devices of self-propelled jib cranes with a lifting capacity of over 50 tons, the service life of which, by definition, should be equal to the service life of the machine as a whole. However, as it is shown from experience, a catastrophic failure of slewing devices occurs after 3 ... 5 years of operation. At the same time, it is obvious that any, even minor, failure of this crane structural element, as well as any other type of equipment, leads to repair work comparable to overhaul in terms of labor intensity. The determination of the causes of slewing device failure depends on changes in the stress-strain state of its elements (ball and roller supports), the loads on which are transmitted from the drive system, one of the main elements is a gear train, which type depends on the model of the crane manufactured (cylindrical or conical). Uneven wear of the teeth of the wheel and gear along the width of the tooth leads to a change in the kinematics of the wheel movement and uneven load on the elements of the pivoting device. Uneven height wear of the wheel is found out, and its upper part wears out to a greater extent than the lower one, which leads to slippage between the gear teeth in the upper part to a greater extent than in the lower one. The wear of the gear teeth and the rotary wheel leads to uneven and increased wear of the cassettes and separators of the slewing device and, accordingly, to the loss of rolling elements. The found unevenness of wheel wear in its various segments enables to make proposals for improving the wheel design. The essence of the improvement is in the manufacture of not a single wheel, but one consisting of four interchangeable parts with the ability to rearrange them as they wear out during operation. This will increase the service life of the slewing devices by 3-4 times and bring it up to the specified rated characteristics of the machine.
wear, slewing device, crane, character, wear, failure, empirical dependencies
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