The invention provides a high-storage-ratio controllable truss spreading device for a
spacecraft. The high-storage-ratio controllable truss spreading device includes a triangular-
prism truss and a controllable spreading device; the triangular-
prism truss comprises an upper triangular frame, upper support rods, hinges, lower support rods, a lower triangular frame, limit bolts and tensile bolts; thecontrollable spreading device comprises tensile arms, a trapezoidal lead screw, limit arms, a lead screw nut, a support frame, a guide rod and the like; the upper triangular frame is located on the upper support rods, the hinges are located between the upper support rods and the lower support rods, the lower triangular frame is located between the lower support rods and the limit bolts, the tensile bolts are located below the limit bolts, the lower triangular frame is located under the upper support rods, the upper triangular frame is located above the tensile bolts, and the tensile arms arelocated on the trapezoidal lead screw. According to the high-storage-ratio controllable truss spreading device for the
spacecraft, by adopting the
single lead screw and a television, controllable spreading of the triangular-
prism truss is achieved; compared with a method using three lead screws, weight reduction of products is achieved, the reliability of a
system is improved, and at the same time, the radical size of the
system is reduced.