Hinge joint mechanism with angular displacement sensor

The utility model relates to a hinge joint mechanism with an angular displacement sensor. According to the hinge joint mechanism with the angular displacement sensor, a driving wheel is fixed on a first section of step on a stepped nail, a second section of step of the stepped nail penetrates through a main rod, a third section of step of the stepped nail is positioned on a secondary rod through the secondary rod, a threaded hole is formed in the lower end portion of the stepped nail, the stepped nail and constructional elements installed on the stepped nail are positioned on the main rod and on the secondary rod in the axial direction through a positioning mechanism to form a movable hinge, a sensor fixing frame is fixed on the main rod, a sensor is installed on the sensor fixing frame, the sensor and the stepped nail are coaxial, a rotary shaft of the sensor is inserted into the upper end portion of the stepped nail and is fixed on the stepped nail through a stopper screw, two step holes are formed in the lateral end of the sensor fixing frame, a line pipe is fixed in the large pore of a first step hole, a rope is installed in the line pipe, and then a complete drive system return circuit is formed by the rope, the driving wheel and a drive system. The hinge joint mechanism with the angular displacement sensor can effectively integrate the sensor with a joint and the drive system.