Single-ball adjustable clamp

The invention relates to a clamp, in particular to a single-ball adjustable clamp. The single-ball adjustable clamp comprises a threaded pressure head, an inner cylindrical support, three clamping jaws, connection rods, push rods and an outer fastening sleeve, wherein the three clamping jaws are arranged in an indexing mode by 120 degrees and used for supporting a small ball; the upper end of each clamping jaw is connected with one lug clack of the inner cylindrical support through a pin shaft, and the lower end of each clamping jaw is connected with the corresponding connection rod through a pin shaft; the connection rods are connected with the push rods through pin shafts; the push rods are restrained in cylindrical holes in the wall of the inner cylindrical support and can move only in the radial direction of the inner cylindrical support; the rear end of each push rod is a spherical surface, extends out of the outer wall of the inner cylindrical support, and abuts against the inverted taper-shaped inner wall of the outer fastening sleeve; the outer fastening sleeve and the inner cylindrical support are connected through threads on the upper half portion of the inner wall of the outer fastening sleeve and form self-locking; the middle of the threaded pressure head in the center of the clamp is connected with the upper end face of the inner cylindrical support through threads, the lower end face of the threaded pressure head extends into a cavity in the lower end of the inner cylindrical support and abuts against the clamped small ball, and the upper end face of the threaded pressure head is connected with a moving mechanism, a loading mechanism and other mechanisms.