The application discloses expanded perlite makes and uses expanded furnace, including the vertically boiler tube, and the zone of heating outside the boiler tube is located to the cover in proper order, heat -resistant layer, heat preservation and stove outer covering, the top correspondence of boiler tube is provided with a feed arrangement, feed arrangement is fixed in on the stove outer covering, feed arrangement is a flexible pipe, including first body and second body, the one end of first body is scalable in the second body, the outside cover of first body is equipped with first flange, the outside cover of second body is equipped with the second flange, the first flange outside is located to a pot head of second flange, it is fixed mutually through the bolt between first flange and the second flange, be formed with the sealing washer between second flange and the first body, this sealing washer extrudees between first flange and second flange, the second body is worn to locate the stove outer covering and is fixed in on the stove outer covering. This neotype feed arrangement is scalable, can adjust the feed inlet and extend to the length in the boiler tube, still can avoid warping under the high temperature condition and influence the installation between feed arrangement and the stove outer covering.