Lock fixed ring and have this lock fixed ring's retractor subassembly

The utility model provides a lock fixed ring includes: the stalk portion, annular portion, annular portion can overlap and establish on the passageway pipe to centre gripping passageway pipe, and the sticking department, the sticking department is connected between stalk portion and annular portion, and includes a locking mechanical system, and wherein, a locking mechanical system's regulation causes the size of annular portion to change to press from both sides tightly or loosen the centre gripping of annular portion to the passageway pipe. This lock fixed ring can detachably and passageway union coupling to it is applicable in not unidimensional passageway pipe. The retractor subassembly including this lock fixed ring is still disclosed. 种锁定环包括：柄部；环形部，环形部能够套设在通道管上，以夹持通道管；以及锁定部，锁定部连接在柄部和环形部之间，且包括第锁定机构，其中，第锁定机构的调节致使环形部的尺寸改变，从而夹紧或松开环形部对通道管的夹持。该锁定环能够可拆卸地与通道管连接，从而可适用于不同尺寸的通道管。还公开了种包括该锁定环的牵开器组件。