Screw nut that can realize quick travel is vice

The utility model relates to a mechanical transmission mechanism field especially relates to a screw nut that can realize quick travel is vice. The utility model provides an it is enough that go on fast or feed movement's screw nut is vice at a slow speed. Its technical scheme: a screw nut that can realize quick travel is vice, includes the center pin, is provided with the pinhole on the center pin, and the pinhole in -connection has the spring, and the other end of spring is connected with the locating pin, cup joint threaded sleeve pipe on the center pin, be provided with a plurality of through -holes that are used for the block locating pin on the threaded bush, screw thread casing thread is connected with the nut, the locating pin includes connector and slide head, the one end and the spring coupling of connector, and the other end of connector is connected with the one end of slide head, two sides that the slide head is on a parallel with the center pin axis are the plane, and two sides of slide head per