According to the structure synthesis theory of parallel robot mechanism
and using single opened chain as unit
a kind of 3-DOF translational parallel mechanism which can realize three-dimensional spacial floating is put forward.The structural performance parameters such as degree of freedom
virtual constraint
coupling degree of this parallel mechanism are calculated.And the motion characteristics and kinematical direct and inverse solution of the mechanism are analyzed.So the singularity configuration is obtained.The mechanism has better symmetry and decoupling performance on structure.