Well type closed cell automatic control pearl stone swelling furnace

The utility model relates to a well type obturator foramen automatic control perlite expanding furnace which utilizes heat emission to carry out controllable 'blind fire' cleaning expansion to ore. The furnace comprises a furnace body which is composed of a main body steel structure, a heat-insulating layer which is located in the main body steel structure and an insulating refractory layer, wherein a high temperature resistance stainless furnace inner container is hoisted in the center of the furnace body from the top to the bottom, an inner electric heat source steel cylinder which is provided with an inner heat source electric-heat wire is hoisted on the upper half part of the furnace inner container, electrical bar heating components and temperature measuring thermal couples which are connected with an outer electric controller are installed in the insulating refractory layer in a layered mode, the lower portion of the furnace inner container is a material outlet, a material feeder is arranged on the uppe