Variable spring support suspension is mainly composed of cylindrical helical spring, displacement indicator plate, shell and elastic nut. Variable spring support hanger can be divided into seven types, A, B, C, D, E, F and G, according to different installation modes. Type A - upper threaded suspension type; Type B - single ear suspension type; Type C - double ear suspension type; Type D - up adjustable suspension type; Type E - down adjustable suspension type; Type F - support suspension type; Type G - parallel suspension type