Hot charging of large motor couplings

The coupling of large motor, many are hot sleeve on the shaft at the same time of installing the motor. Coupling shaft hole and shaft matching is the manufacturer according to the nature of the work and requirements to determine.

The hot sleeve coupling is heated on the shaft using different methods to expand the coupling to the required size. Generally speaking, heating methods can be divided into boiling hot oil, burning wood, charcoal and coke, or using oxygen acetylene and induction heating. If the coupling shaft is light in weight and small in volume, the operation is more convenient and the method of hot oil cooking and wood burning can be used. However, burning with wood is dirty and not easy to heat evenly. Using oil cooking and induction heating method. For large couplings, most of the induction heating method. Because of the heavy weight of the large coupling, it is necessary to rely on the main cell crane to lift it when it is heated or fitted. Induction heating can be carried out in the main electric room without affecting other construction because of its small footprint. It is relatively clean when heating and can accurately control the thermal expansion of the inner hole of the coupling.

The method of induction heating is: the coupling is wrapped around the number of turns of wire as an induction winding, and the induction winding produces magnetic flux with the alternating current. At this time the heated coupling will produce alternating magnetic field (that is, produce eddy current), and make the coupling heat, temperature.