Abstract
The paper considers the basic principles of motion along the polar cranes circumference. The geometric parameters of the mutual turn of the crane running wheels are shown to be the critical features in the crane motion along the circumference. Noncompliance of the turn determines the transverse slippage of the crane running wheels, while the wheel shape affects only the elastic longitudinal slip. The consequence of slide and slippage is the railhead actuation on one side and the loss of the road stability when the crane moves. Stability of the road-holding rigidity ensures achievement of targeting accuracy of the load-gripping device. These parameters are the main operational characteristics which should be normalized and should be minimal in absolute terms.
Highlights
At modern nuclear power plants under construction at NPP-2006 and WWER-TOI design the polar cranes is the primary transport facility for the main lifting and transport operations in the hermetic volume when installing the equipment of the primary circuit (reactor shell, steam generators, main circulation pumps, pipelines) and refueling (Fig. 1)
At modern nuclear power plants under construction at NPP-2006 and WWER-TOI design the polar cranes is the primary transport facility for the main lifting and transport operations in the hermetic volume when installing the equipment of the primary circuit and refueling (Fig. 1)
One of the main features of the polar cranes is their movement along the circle
Summary
At modern nuclear power plants under construction at NPP-2006 and WWER-TOI design the polar cranes is the primary transport facility for the main lifting and transport operations in the hermetic volume when installing the equipment of the primary circuit (reactor shell, steam generators, main circulation pumps, pipelines) and refueling (Fig. 1). This determines the stringent requirements for the accuracy of the running wheel manufacturing, their installation in small and in main balancers. Manufacturing errors can not be corrected such as in the running gear with the wheel installation in the balancers with the help of rotors.
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