Moving mechanism for mechanical arm of injection molding machine

The utility model discloses a moving mechanism for a mechanical arm of an injection molding machine, a second moving assembly is mounted on a first moving assembly, a third moving assembly is mounted on the second moving assembly, and a clamp holder is mounted at the bottom end of a slide rail of the third moving assembly. In the process that a motor A on a moving block drives a gear A to rotate, the motor A drives the gear A to move on a rubber rack meshed with the gear A, so that the moving block moves on a sliding rail, and in the moving process, different moving assemblies on a mechanical arm of the injection molding machine are locked after moving to a fixed point position so that the mechanical arm of the injection molding machine can conveniently pick up injection molding parts on the injection molding machine; a locking mechanism is arranged at the top end of a gear A on the moving block, after a motor B on the locking mechanism is started, a positioning plate connected with a connecting rod is driven