Bobbin structure

The utility model discloses a winding tube structure, which is an assembly structure for the wring of the first stage lead and the second stage lead wire of the transformer. The structure includes a first and a second grade tubes, the second grade winding tube is provided with two secondary winding zones for the winding of the secondary lead; and the first and the second grade winding tube sleeve, the second winding tube is provided with two winging tube containing zones that can contain the second grade winding tube, which is used for isolating and protecting the second grad lead, and a first grade winding zone is provided between the two winding tube containing zone; the utility model is mainly to arrange the first grade and the second grade winding tube separately, when the first grade lead is wound, the second grade lead can also be wound at the same time to promote production rate; and arrange the first grad winding zone on the isolating sleeve of the second winding tube, when a transformer is assembled, the transformer has the first grade lead and the second winding tube isolating sleeve, i.e. has efficacy of isolation and protection of the second grade lead, thus, time and cost can be saved.