Locking device with two rows of steel balls

The utility model relates to a locking device for double rows of steel balls, which comprises a rotary rod of a sliding sleeve and a nut outer sleeve. The utility model is characterized in that the lower part of the outer side of the nut outer sleeve is provided with a casing provided with an extended part; the outer side of the casing is provided with an inner concave ring sheathed with an outer spring, and an outer sliding ring is arranged under the outer spring. The rotary rod of a sliding sleeve on the lower part of the inner side of the nut outer sleeve is sheathed with an inner spring; the lower part of the rotary rod of a sliding sleeve is provided with two grooves; an inner sleeve is arranged between the rotary rod of a sliding sleeve on the lower part of the inner side of the nut outer sleeve and the outer sliding ring; positions which are opposite to the two grooves of the rotary rod of a sliding sleeve on the inner sleeve are provided with two through slots, wherein, the interiors of which are provided with steel balls. The utility model has the advantage of convenience.