The invention discloses a
steel ball self-locking mechanical connecting device and method, and belongs to the technical field of buildings. The
steel ball self-locking mechanical connecting device comprises an
upper joint and a lower joint, and further comprises steel balls, a supporting ring, a limiting piece, a supporting piece, a plug and an arc-shaped groove, wherein the steel balls are arranged in the
upper joint; the steel balls are arranged in the circumferential direction of the outer side face of the supporting ring; the limiting piece is used for limiting the downward falling trend of the supporting ring; the supporting piece is used for providing downward and
centripetal force for the steel balls; one end of the plug is connected with the upper end in the lower joint, and the other end of the plug extends out of the upper end of the lower joint; the arc-shaped groove is of a groove structure formed in the side wall of the extending end of the
plug in the circumferential direction; and after the
upper joint and the lower joint abut against each other, the plug penetrates through the limiting piece and jacks up the supporting ring, and the steel balls enter the arc-shapedgroove under the acting force of the supporting piece. The device is easy to assemble, structures are matched with each other after
assembly, automatic triggering and locking can be achieved after theupper joint and the lower joint abut against each other under the action of gravity, triggering is easy and convenient, rigid limitation is formed between the steel balls and the rigid plug arc-shaped groove after triggering, and stable and effective anti-drawing acting force is provided for a precast
pile after connection.