Expanding centering clamping milling unit

The utility model discloses an expanding centering clamping milling unit belongs to mechanical technical field. The utility model discloses an expanding centering clamping milling unit, including lock nut, spring box, mandrel, reset spring, spring seat plate, the anchor clamps body, supporting sleeve, location extension board, steel wire, pneumatic component, the mandrel passes spring box, reset spring installs in spring box, and the directional pneumatic component's of reset spring one end is connected with spring seat plate, the anchor clamps position is between spring box and pneumatic component, the supporting sleeve is installed on the anchor clamps body, sets up the guide way of radially evenly arranging on the supporting sleeve, the location extension board is installed in the supporting sleeve guide way, the steel wire passes the mounting hole on the extension board of location and fixes a position the bottom circular -arc slope and mandrel conical contact of extension board. The utility model disclos