Sliding beam and spring combined nonlinear ultra-low frequency vibration isolator

The invention discloses a sliding elastic beam and spring combined nonlinear ultra-low frequency vibration isolator, which mainly comprises a sliding elastic beam with negative rigidity and a spring with positive rigidity, and is provided with a connection component and a supporting structure, wherein the spring is connected below the sliding elastic beam; the connection component is used for connecting the sliding elastic beam; the supporting structure is used for supporting the sliding elastic beam; the sliding elastic beam has negative rigidity during deformation; the spring is of positive rigidity; and the entire vibration isolator has the characteristic of near zero rigidity because of combination of the two elastic elements. The entire system, namely the sliding beam and spring combined nonlinear ultra-low frequency vibration isolator provided by the invention has the characteristic of approximately dynamic quasi zero rigidity, can be used for isolating vibration of ultra-low frequency and has an anti-impact effect.