The invention provides a
ball joint mechanism with a compact structure, which comprises a
solid ball body and a shell capable of accommodating the ball body, and a ball
handle is arranged at the upper part of the ball body; a stepped through hole is formed in the position, corresponding to the ball
handle, of the ball body, the stepped through hole is composed of a
small hole section and a large hole section, the
small hole section is a threaded hole, the large hole section is an unthreaded hole, an opening of the
small hole section faces upwards and is located on the ball
handle, and an opening of the large hole section faces downwards and is located on the spherical surface of the ball body; an adjusting screw plug, a spring and a
plunger are sequentially installed in the stepped through hole from top to bottom, one part of the adjusting screw plug is in threaded fit with the small hole section, the other part of the adjusting screw plug is located in the large hole section, the outer side end of the
plunger can extend outwards from an opening of the large hole section under the elastic force action of the spring, and the end face of the outer side end of the
plunger is a spherical surface; a curved surface seat is arranged on the lower portion of the shell, the curved surface seat is provided with an inner
concave surface, and the outer side end face of the plunger is in contact fit with the inner
concave surface of the curved surface seat. The ball body in the structure can obtain large damping feeling during rotation and is very smooth during rotation.