Top of built -in connecting portion

The utility model discloses a top of built -in connecting portion, the top appears for bullet head, and inside sets up bullet head type cavity, set up the guide arm mounting in the cavity, the guide arm mounting is the bullet head type, and the setting of laminating cavity sets up the fixed disk in the middle of the guide arm mounting is inside, the fixed disk sets up the snap ring for ring shape in the middle of the fixed disk, the snap ring sets up arc opening and stopper for ring shape on the snap ring, arc opening and stopper are on same straight line, top of built -in connecting portion, with the in -process of guide arm cooperation installation, the operation is simple more, the positioning groove degree of depth of setting is more shallow for the limited position of guide arm entering does benefit to the equipment and the separation of top and guide arm, is difficult for coming off, does not influence the production technology of tub class, and is more convenient, and while snap ring height is less tha