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Structural characteristics of three gear shaft box for rolling mill
The shafts in the three gear shaft box for rolling mill can be divided into active shafts, driven shafts and intermediate shafts according to their active and passive relationships. The extended parts of the first-stage driving shaft and the last-stage driven shaft are used to install half couplings, which are connected with the wind wheel hub or the motor drive shaft. In order to improve reliability and reduce external dimensions, sometimes the half coupling (flange) is made into one body with the shaft. The journals of the mating parts on the shaft need to be ground. In order to reduce stress concentration, the transition fillet at the shoulder of the shaft and the transition part of the spline to a larger shaft diameter should be treated with necessary treatment, such as polishing, to improve the fatigue strength of the shaft.
In the interference fit, in order to reduce the stress concentration on the edge of the hub, the shaft diameter of the three gear shaft box for rolling mill should be 5% larger than the shaft diameter of the adjacent part, or a relief groove should be opened on the hub. The parts installed on the shaft should be reliably fixed in the axial direction, and the working load should be borne by the thrust shoulder on the shaft as much as possible, and nuts or other fasteners can be used for fixing in the opposite direction. In order to prevent the threads from loosening, stop washers, double nut washers, lock screws or tandem iron wires can be used. Sometimes in order to save space and simplify the structure, spring retaining rings can also be used instead of nuts and stop washers, but they cannot be used in places with excessive axial loads.
The shaft material of the three gear shaft box for rolling mill adopts carbon class and alloy class. The commonly used heat treatment method is quenching and tempering, and the important parts are quenched. When the requirements are higher, high-quality low-carbon alloys can be used for carburizing and quenching treatment to obtain higher surface hardness and higher core toughness.
The three gear shaft box for rolling mill is one of the important parts and must be used and maintained correctly to extend the service life. The three gear shaft box for rolling mill should be overhauled every six months. The spare parts should be manufactured in accordance with the regular drawings. After replacing the new spare parts, the gear box should meet the technical requirements and be used after trial operation and load test.