Rapid jacking method for online rotor extraction of large motors

Abstract

The invention relates to the field of maintenance of steel equipment, in particular to a quick lifting method for online drawing a rotor of a large motor. The quick lifting method comprises the steps as follows: dismantling a cardan shaft of the motor; dismantling an upper tile of a bearing base of the motor, an outer cover of the motor and a foundation bolt of a stator of the motor; dismantling an encoder of the motor and a thrust bearing. The quick lifting method is characterized in that a lifting beam of the rotor is lifted by a traveling crane and arranged at the top of the stator of the motor; chain blocks and steel cables are hung at the two ends of the lifting beam of the rotor; the rotor of the motor is lifted through the chain blocks, and is not contacted with the interior of the stator of the motor; electric hydraulic jacks are erected at the four corners of the stator of the motor and used for synchronously lifting the stator of the motor and the rotor, fixed through the lifting beam of the rotor, of the motor; when the electric hydraulic jacks are lifted to the lowest position of the rotor of the motor beyond the plane of the bearing base, the lifting beam of the rotor is lifted by the traveling crane, and the rotor of the motor is drawn out. The quick lifting method can quickly and safely lift the large motor and finish the rotor drawing operation, and overcomes the defects in the traditional large motor lifting operation.

Description

technical field [0001] The invention relates to the field of steel rolling equipment maintenance, in particular to a rapid jacking method for a large-scale electric motor to extract a rotor online. Background technique [0002] In the current metallurgical enterprises, the online rotor extraction of large motors generally adopts the method of motor jacking - pumping the rotor. The jacking method is based on the fact that the rated lifting capacity of the driving in the workshop where the main motor of the rolling mill is located is generally less than the total weight of the motor, which cannot be lifted with one hook. The rotor and the stator of the motor, therefore, the rotor and the stator must be used as separate components, and at the same time, the crane and the jack are used to realize the principle of multiple alternate lifting. The general idea of ​​this method is to use the crane to hang the motor rotor, use mechanical jacks evenly distributed on the four feet of t...

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