A delivery device for delivering stock material into a blast furnace includes a transition channel for the stock material, a chute for delivering the stock material, a first annular body, coaxial to and outside the transition channel, adapted to rotate about a first axis, and a second annular body, coaxial to and outside the first annular body, adapted to translate along the first axis with respect to said first annular body and/or to rotate about the first axis together with said first annular body. When the second body translates along the first axis, at least one fixed rack rotates at least one toothed wheel and a respective shaft about a second axis transversal to the first axis, thus causing a change in the inclination of the chute with respect to the first axis.

A delivery device for delivering stock material into a blast furnace includes a transition channel for the stock material, a chute for delivering the stock material, a first annular body, coaxial to and outside the transition channel, adapted to rotate about a first axis, and a second annular body, coaxial to and outside the first annular body, adapted to translate along the first axis with respect to said first annular body and/or to rotate about the first axis together with said first annular body. When the second body translates along the first axis, at least one fixed rack rotates at least one toothed wheel and a respective shaft about a second axis transversal to the first axis, thus causing a change in the inclination of the chute with respect to the first axis.

Disclosed is a blast furnace apparatus includes: a rotating chute; a plurality of tuyeres; a profile measurement device configured to measure surface profiles of a burden charged into the blast furnace through the rotating chute; and a blowing amount controller configured to control a blowing amount of at least one of hot blast or pulverized coal in each of the plurality of tuyeres, in which the profile measurement device includes: a radio wave distance meter installed on the blast furnace top and configured to measure the distance to the surface of the burden charged; and an arithmetic unit configured to derive the surface profiles of the burden on a basis of distance data for the entire blast furnace related to distances to the surface of the burden obtained by scanning a detection wave of the radio wave distance meter in the blast furnace in a circumferential direction.

Disclosed is a blast furnace apparatus includes: a rotating chute; a plurality of tuyeres; a profile measurement device configured to measure surface profiles of a burden charged into the blast furnace through the rotating chute; and a blowing amount controller configured to control a blowing amount of at least one of hot blast or pulverized coal in each of the plurality of tuyeres, in which the profile measurement device includes: a radio wave distance meter installed on the blast furnace top and configured to measure the distance to the surface of the burden charged; and an arithmetic unit configured to derive the surface profiles of the burden on a basis of distance data for the entire blast furnace related to distances to the surface of the burden obtained by scanning a detection wave of the radio wave distance meter in the blast furnace in a circumferential direction.

A metal material supply device which is annexed to a metal melting furnace has a vibration trough for transporting metal material to be supplied to a crucible; the transported metal material is discharged from a material discharge port that is provided at the front end of the vibration trough; the metal material supply device is movable between a material supply position where the material discharge port is disposed above the crucible and a retracted position from the material supply position, and supplies the metal material to the crucible at the material supply position; the upper end of the metal material supplied to the crucible and piled up is detected by a microwave level meter, and the material supply operation by driving the vibration trough is controlled on the basis of the detected value.

A metal material supply device which is annexed to a metal melting furnace has a vibration trough for transporting metal material to be supplied to a crucible; the transported metal material is discharged from a material discharge port that is provided at the front end of the vibration trough; the metal material supply device is movable between a material supply position where the material discharge port is disposed above the crucible and a retracted position from the material supply position, and supplies the metal material to the crucible at the material supply position; the upper end of the metal material supplied to the crucible and piled up is detected by a microwave level meter, and the material supply operation by driving the vibration trough is controlled on the basis of the detected value.

[OBJECT] To provide a fractionating device capable of stably fractionating powders such as cement raw materials by a simple configuration.

[SOLUTION] A fractionating device 1 for fractionating some of a powder (cement raw material) R falling in a chute (main body) 2, wherein the fractionating device is equipped with a screw conveyor 5 which passes through the chute, a part of a casing 5a opening inside the chute, and receives part of the powder from an opening (inlet) 5b, and a collision separation member (collision separation rod) 4 which is provided above the screw conveyor in the chute and collides with an object when an object of a predetermined size or larger falls, and prevents the object from falling directly onto the screw conveyor. A rotation shaft 5d of the screw conveyor may be inclined from 5° to 20° with respect to the horizontal plane so that the end of the discharge port side of the screw conveyor is positioned above the other end and may be equipped with a guide member 3 that guides the powder falling in the chute in the direction of the opening of the screw conveyor.

[OBJECT] To provide a fractionating device capable of stably fractionating powders such as cement raw materials by a simple configuration.

[SOLUTION] A fractionating device 1 for fractionating some of a powder (cement raw material) R falling in a chute (main body) 2, wherein the fractionating device is equipped with a screw conveyor 5 which passes through the chute, a part of a casing 5a opening inside the chute, and receives part of the powder from an opening (inlet) 5b, and a collision separation member (collision separation rod) 4 which is provided above the screw conveyor in the chute and collides with an object when an object of a predetermined size or larger falls, and prevents the object from falling directly onto the screw conveyor. A rotation shaft 5d of the screw conveyor may be inclined from 5° to 20° with respect to the horizontal plane so that the end of the discharge port side of the screw conveyor is positioned above the other end and may be equipped with a guide member 3 that guides the powder falling in the chute in the direction of the opening of the screw conveyor.

A method for charging raw materials into a blast furnace is provided. The blast furnace includes a bell-less charging device that includes a plurality of main hoppers and an auxiliary hopper. The auxiliary hopper has a smaller capacity than the main hoppers. The method includes discharging ore charged in at least one of the plurality of main hoppers and then sequentially charging the ore from a furnace center side toward a furnace wall side by using a rotating chute. After charging of the ore is started, only the ore is charged from the rotating chute at least until charging of 15 mass % of the ore is completed based on a total amount of the ore to be charged per batch; then discharging of small-size coke charged in the auxiliary hopper is started; and then, the small-size coke is charged together with the ore from the rotating chute.

A method for charging raw materials into a blast furnace is provided. The blast furnace includes a bell-less charging device that includes a plurality of main hoppers and an auxiliary hopper. The auxiliary hopper has a smaller capacity than the main hoppers. The method includes discharging ore charged in at least one of the plurality of main hoppers and then sequentially charging the ore from a furnace center side toward a furnace wall side by using a rotating chute. After charging of the ore is started, only the ore is charged from the rotating chute at least until charging of 15 mass % of the ore is completed based on a total amount of the ore to be charged per batch; then discharging of small-size coke charged in the auxiliary hopper is started; and then, the small-size coke is charged together with the ore from the rotating chute.