The utility model discloses a light-weight
robot arm structure. The light-weight
robot arm structure comprises a shoulder rotating module, a shoulder stretching module, a large arm rotating module, an
elbow joint stretching module, a small arm rotating module, a
wrist rotating stretching module and a grabbing module which are made of aluminum
alloy. The shoulder rotating module is connected with the large arm rotating module through the shoulder stretching module, one end of the large arm rotating module is connected with the small arm rotating module through the
elbow joint stretching module, the other end of the small arm rotating module is connected with the
wrist rotating stretching module, and the
wrist rotating stretching module is connected with the grabbing module. Wherein the shoulder rotating module, the shoulder stretching module, the large arm rotating module, the
elbow joint stretching module and the small arm rotating module are each internally provided with a
servo driving
assembly, and the wrist rotating stretching module comprises two stacked steering engines. Swinging and rotating of seven
degrees of freedom can be achieved, under the condition of the same driving torque, the lighter the self structure weight is, the larger the load capable of being borne by the
tail end is, the load is relatively large, and installation and debugging are convenient.