Disclosed is a mechanical arm with a locking-device-contained
motion range changeable link mechanism and used for assembling work. The mechanical arm is characterized by comprising a base 19, a second driving rod 21, a second connecting rod 2, an upper arm 4, a
wrist connecting rod 7, a first driving rod 17, a big arm 9, a fourth connecting rod 14, a first connecting rod 12, a
wrist 27, an assembling clamping paw 28, a
servo driving device and a third connecting rod 10; a first electromagnetic locking device 23 is installed on a second revolute pair 15; a second electromagnetic locking device 24 is installed on a tenth revolute pair 3; the
servo driving device comprises a first
servo motor and a second servo motor, and the first servo motor and the second servo motor are connected to the first driving rod 17 and the second driving rod 21 to drive the first driving rod 17 and the second driving rod 21 to rotate; the first electromagnetic locking device 23 and the second electromagnetic locking device 24 are locked through an
electromagnetism method to jointly complete motion of rising and falling of the big arm and pitching of the
wrist connecting rod and the wrist and the like, and to jointly achieve the assembling work of the assembling clamping paw 28. According to the mechanical arm with the locking-device-contained
motion range changeable link mechanism and used for the assembling work, the
motion range changeable link driving mechanism is utilized to replace a traditional hydraulic drive, and the shortcomings that a
hydraulic pressure assembling work mechanical arm is complicated in hydraulic
system and prone to oil leakage are overcome.