Ground zero-gravity test device for small-space one-dimension extension mechanism

The invention relates to a ground zero-gravity test device for a small-space one-dimension extension mechanism for a spacecraft to overcome the defects of various test devices in the prior art and to solve the problem that the small-space one-dimension extension mechanism simulates the zero-gravity state of in-orbit operation in the ground gravity environment and to further solve the problem about compatibility of the small-space one-dimension extension mechanism with the comprehensive operation of the vacuum test and the thermal test. The ground zero-gravity test device adopts the principle of square teeth meshing and combines the real-time synchronism of a synchronous belt to vertically hang a tested mechanism. The ground zero-gravity test device is simple and feasible in design, small in size and light in weight, convenient to move, and strong in adaptability to the environment, can effectively operate in a vacuum or thermal environment condition, and can be used for testing the expanding characteristic of one-dimension extension mechanisms like a coiled extension arm and a thin-wall tubular extension arm.