Precision rotational transmission mechanism

A precision rotational transmission mechanism, comprising a fixing support (1), wherein the fixing support (1) is provided with a rotational case (112);

• the rotational case (112) rotates around an axis of the rotational case (112);
• output surfaces (1121) used for connection with a load are arranged on the rotational case (112);
• the rotational case (112) is connected with a motor;
• a first transmission mechanism (1122), a second transmission mechanism (33) and an output member (19) are arranged in the rotational case (112);
• one end of the first transmission mechanism (1122) is connected with the motor, and the other end is connected with the second transmission mechanism (33);
• the second transmission mechanism (33) drives the rotational case (112) to rotate synchronously through the output member (19);
• the first transmission mechanism (1122) comprises a worm gear (5), a worm (8) meshed with the worm gear (5), a motor flange (7), a worm connecting shaft (21), and a worm connecting gear (201);
• the worm (8) is connected with the motor through the motor flange (7);
• one end of the worm connecting shaft (21) is connected with the worm (8), and the other end is connected with the motor;
• a spline shaft (18) is arranged on the motor;
• the spline shaft (18) is connected with the worm connecting gear (201) through the motor flange (7);
• and the worm connecting gear (201) is connected with the worm connecting shaft (21).