Spherical hinge friction performance testing machine

The utility model relates to a spherical hinge friction performance testing machine, comprising a spherical hinge clamp comprising an upper connecting seat, a lower connecting seat and a middle supporting seat which are arranged at intervals up and down; the upper connecting seat and the lower connecting seat are vertically symmetrical and are respectively fixedly connected with a ball head screw of a to-be-tested spherical hinge; the top of the bearing seat is used for supporting a ball cup of a to-be-tested spherical hinge fixed below the spherical hinge clamp; the loading head is used for applying a downward test load to a ball cup of a to-be-tested spherical hinge fixed above the spherical hinge clamp; the second loading device is used for driving the middle supporting seat to rotate around the center position of the middle supporting seat in the vertical plane; the vertical force sensor is used for detecting the pressing force of the first loading device on the to-be-detected spherical hinge; the driving