The invention relates to an extension type quasi-zero stiffness vibration
isolator and an implementation method thereof. The vibration
isolator is formed by a
negative stiffness mechanism in parallel connection with a positive stiffness main spring, wherein the
negative stiffness mechanism is composed of extension springs, connecting rods, slide blocks and guide rails;
negative stiffness can be generated in the vertical direction, and in addition, the defect that compression springs lose stability can be avoided; and it can be guaranteed that the structure is in
bilateral symmetry when fine adjustment is conducted in the horizontal direction. On the basis of the principle that positive stiffness and negative stiffness counteract each other, after the negative stiffness mechanism is in parallel connection with the positive stiffness spring, stiffness, at the equilibrium position, of the vibration
isolator is close to zero, and inherent frequency is also close to zero, so that starting
vibration isolation frequency is greatly reduced; the
vibration isolation section is increased; and capability of isolating
low frequency or ultralow frequency vibration is achieved. The vibration isolator is simple and compact in structure and convenient to assemble and debug and has certain
engineering application value in the fields such as automobiles, precise instruments, sensitive equipment, precision
machining and
aerospace engineering.