SAFETY SPINDLE OF STAND DRIVE OF ROLLS Russian patent published in 1998 - IPC

FIELD: rolling, protection of main lines of stand of rolls against technological overloads. SUBSTANCE: safety spindle has left and right heads coupled by destroyable bushing screwed on their threaded ends. Bushing can be destroyed by three different methods. If bushing is made from fragile material and thread is self-locking most probable destruction is by break-off. With this in mind friction spacer is put between faces of heads. If bushing is made from plastic material and thread is power screw thread then most probable destruction is by displacement. Thrust bearing is installed between faces of heads for this purpose. Cutting of thread of bushing is also possible in addition. Heads are produced from high-strength material and can be used many times. Loosened section of destroyable bushing is separated by smooth groove to avoid concentration of stresses. After destruction of bushing heads do not fall out from clutches and keep rectilinearity of axis thanks to availability of tie in the form of cylindrical boss of one head that freely enters cylindrical hole of another head. For resetting of serviceability of safety spindle of rolls stand after operation it will be necessary to remove destroyed parts of bushing and to screw new bushing on threaded ends of heads. Usage of proposed safety spindle allows downtime of stand related to resetting of serviceability of destroyed safety links to be diminished 2.0-2.5 times as compared with the prototype, expenses for replacement of destroyed member to be reduced by 1.5-2.0 times, labor input of resetting operations to be decreased by 2.0-4.0 times. EFFECT: increased quality of rolled products and provision of accident-free functioning of equipment. 9 cl, 4 dwg