Extension spring type quasi-zero stiffness vibration isolator

The utility model discloses an extension spring type quasi-zero stiffness vibration isolator. Including a base, a platform is arranged above the middle part of the base; a pressure spring is arrangedbelow the platform in the vertical direction; the upper end of the pressure spring pushes against the bottom of the platform; the lower end of the pressure spring is propped against the base; more than three fixed supporting seats are arranged above the base in a surrounding manner by taking the platform as a center; the bottom end of each fixed supporting seat is fixedly connected with the base;the top end of each fixed supporting base is provided with a sliding way in the radial direction, the sliding ways penetrate through the edges of the inner sides of the corresponding fixed supportingbases inwards in the radial direction, each sliding way is provided with a sliding block, the end face, facing the platform, of each sliding block is hinged to the outer end of the corresponding supporting rod, and each support