EP3534098A1

EP3534098A1 - Raw material charging apparatus and charging method therefor

Info

Publication number: EP3534098A1
Application number: EP16919841.3A
Authority: EP
Inventors: Hae Kwon Jeong; Kyung Won Seo; In Taek Lim; Yong In Kim
Original assignee: Posco Co Ltd
Current assignee: Posco Holdings Inc
Priority date: 2016-10-31
Filing date: 2016-12-16
Publication date: 2019-09-04
Also published as: WO2018079933A1; EP3534098A4; CN109891175A; JP2019536967A

Abstract

The present invention relates to a raw material charging apparatus and a charging method thereof. The raw material charging apparatus includes a charging chute disposed between a raw material feeding part and a container to charge a raw material into the container, wherein the charging chute includes a movable roll, which is movable in a direction crossing a width direction of the charging chute, in at least a portion thereof. Thus, the raw material charging apparatus may quickly respond to an operation fluctuation to improve quality and productivity of sintered ore.

Description

TECHNICAL FIELD

The present invention relates to a raw material charging apparatus and a charging method thereof, and more particularly, to a raw material charging apparatus and method, which are capable of improving quality and productivity of sintered ore by rapidly responding to fluctuation in operation.

BACKGROUND ART

In general, in a process of producing sintered ore, fine iron ore, subsidiary raw materials, and fuels (fine coke, anthracite, or the like) are put into a drum mixer to be mixed and humidified so that the sintering mixed raw material that is pseudo-granulated is charged into a sintering car.
The sintering mixed raw material is charged into the sintering car by using a charging chute constituted by an inclined plate and a plurality of rolls or rods. The charging chute generates grain segregation so that large and heavy particles of the sintering mixed raw material are charged into a lower layer of the sintering car, and small and light particles are charged in the upper layer to induce segregation charging so that air permeability is good during the sintering.
In the process of producing the sintered ore, when the fluctuation in operation such as a variation in height (layer thickness) of the raw material layer or a change in moisture content or particle size in the sintering mixed raw material occurs, fluctuation in charging pattern is inevitable. For example, in the case in which it is necessary to reduce the layer thickness rather than the normal operation, since pressure charging occurs in a state in which a height of the lowermost end of the charging chute is fixed, the height of the lowermost end of the charging chute may be lowered, or an inclination of the charging chute may be reduced to reduce a moving speed of the sintering mixed raw material. Also, in a case in which a relatively large amount of moisture is contained in the sintering mixed raw material, the fine raw material of the sintering mixed raw material is attached to the charging chute to reduce the moving speed of the sintering mixed raw material moving along the charging chute, it is necessary to increase in inclination of the charging chute so as to maintain the moving speed of the sintering mixed raw material. Also, in a case in which it is necessary to increase in layer thickness rather than the normal operation, a lower end of the charging chute may contact the raw material layer to press the a surface layer portion, thereby reducing the air permeability during the sintering.
However, when the height or inclination of the charging chute is changed, there is a problem in that it is difficult to quickly respond to the fluctuation in operation because a relationship between peripheral facilities have to be considered.

DISCLOSURE OF THE INVENTION

TECHNICAL PROBLEM

The present invention provides a raw material charging apparatus and a charging method thereof, which are capable of quickly responding to fluctuation in operation.
The present invention provides a raw material charging apparatus and a charging method thereof, which are capable of improving air permeability of a raw material layer to improve quality and productivity of sintered ore.

TECHNICAL SOLUTION

A raw material charging apparatus according to an embodiment of the present invention may include a charging chute disposed between a raw material feeding part and a container to charge a raw material into the container, wherein the charging chute may include a movable roll, which is movable in a direction crossing a width direction of the charging chute, in at least a portion thereof.
The charging chute may include a plurality of fixed rolls that are disposed parallel to each other to form a moving path for the raw material, and the movable roll may be disposed below the fixed rolls from which the raw material breaks away into the container.
The charging chute may include an upper charging chute having an area and a plate shape to form the moving path for the raw material, and the movable roll may be disposed on a lower portion of the upper charging chute from which the raw material breaks away into the container.
The movable roll may be disposed at the lowermost end in a direction in which the raw material moves in the charging chute.
At least a portion of the moving path may have a linear or curved cross-sectional shape.
At least a portion of the moving path may have a cycloid curved cross-sectional shape.
The raw material charging apparatus may further include an elevation unit that allows the movable roll to move.
The elevation unit may include one of a cylinder, a screw shaft, and a hydraulic jack.
The raw material charging apparatus may further include a driving unit that allows the movable roll to rotate.
The movable roll may be movable in a vertical direction.
The movable may be movable in a vertical direction or a direction perpendicular to the moving direction of the raw material that moves along the charging chute.
The movable roll may move forward and backward in the direction crossing the width direction of the charging chute.
A raw material charging method for charging a raw material into a container by using a charging chute forming a moving path for the raw material according to an embodiment of the present invention may include: allowing a movable roll disposed on a lower portion of the charging chute, from which the raw material breaks away into the container, to move in a direction crossing a width direction of the charging chute; and feeding the raw material into the charging chute to charge the raw material into the container.
The allowing of the movable roll to move in the direction crossing the width direction of the charging chute may include allow the movable roll to move according to at least one of a particle size of the raw material, a moisture content of the raw material, or a charging amount of the raw material.
The movable roll may move to adjust at least one of a speed or height at which the raw material breaks away from the charging chute.
The movable roll may move to form a space around the movable roll.
While the raw material is charged into the container, a portion of the raw material may be discharged into the space to charge the raw material into an upper layer portion of a raw material layer formed in the container.
While the raw material is charged into the container, the movable roll may rotate.

ADVANTAGEOUS EFFECTS

According to the embodiment of the present invention, it may be possible to control the charging pattern of the sintering mixed raw material in response to the fluctuation of the operation condition. That is, the movable roll may be provided in the lower portion of the charging chute, and the movable roll may move according to the operation condition fluctuation to control the breakaway angle and speed of the mixed raw material charged into the sintering car. Since the charging pattern is quickly controlled according to the operation fluctuation, the charging fluctuation of the raw material layer within the sintering car may be minimized. Thus, the sintered ore having the predetermined strength while constantly maintaining the air permeability within the raw material layer during the sintering may be manufactured to improve the process efficiency and the productivity.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic view of a raw material charging apparatus according to an embodiment of the present invention.
FIGS. 2 to 5 are perspective and cross-sectional views of a charging chute constituting the raw material charging apparatus according to an embodiment of the present invention.
FIG. 6 is a schematic view illustrating an example of an elevation unit for driving a movable roll.
FIG. 7 is a schematic view of a raw material charging apparatus according to a modified example of the present invention.
FIG. 8 is a perspective view of a charging chute constituting the raw material charging apparatus according to an embodiment of the present invention.
FIGS. 9 and 10 are views illustrating an example in which a raw material is charged by using the raw material charging apparatus according to an embodiment of the present invention.
FIGS. 11 to 13 are views for explaining another example in which the raw material is charged by using the raw material charging apparatus according to an embodiment of the present invention.
FIGS. 14 to 17 are views illustrating a moving state of a lower charging chute according to a modified example of the present invention.

MODE FOR CARRYING OUT THE INVENTION

Hereinafter, specific embodiments will be described in detail with reference to the accompanying drawings. The present invention may, however, be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention will be thorough and complete, and will fully convey the scope of the present invention to those skilled in the art.
FIG. 1 is a schematic view of a raw material charging apparatus according to an embodiment of the present invention.
First, a raw material charging apparatus according to an embodiment of the present invention will be described with reference to the accompanying drawings.
Referring to FIG. 1, a raw material charging apparatus may include a raw material feeding part comprising a raw material hopper 100 and a drum feeder 120 and a charging chute 130.
The raw material hopper 100 feeds mixed raw materials 1 such as fine iron ore, subsidiary raw materials, and fine coke to the drum feeder 120 via a hopper gate 110, and the drum feeder 120 mixes the mixed raw materials 1 fed therein while rotating to dispense the mixed raw material 1 to the charging chute 130.
The charging chute 130 is provided between the raw material hopper 1 and a sintering car 200 to charge the mixed raw material 1 into the sintering car 200. In the charging chute 130, a plurality of rolls are disposed parallel to each other to form a moving path, through which the mixed raw material moves, in an upper portion thereof. Here, the charging chute 130 may have the moving path that is formed in an inclined surface or curved surface shape having a predetermined area. Here, when the charging chute 130 is formed in the curved surface shape having the predetermined area, the charging chute 130 may have a transverse sectional shape formed in a cycloid curve shape. Due to the above-described configuration, the charging chute 130 may serve to promote vertical segregation so that the mixed raw material having a relatively large particle size is charged into a lower portion of the sintering car 200, and the mixed raw material having a relatively small particle size is charged into an upper portion of the sintering car 200.
When the mixed raw material 1 is charged into the sintering car 200 by using the raw material charging apparatus to form a raw material layer, a surface layer portion of the raw material layer may be planarized on a surface smoothing plate 140 provided at a front side with respect to a moving direction of the sintering car 200. Sequentially, the surface layer portion is ignited in a igniting burner 150 provided in front of the surface smoothing plate 140, and while the sintering car 200 moves along a sintering section, the fuel material of the mixed raw material within the sintering car 200, for example, the fin coke may be burned by suction force of a wind box to manufacture sintered ore.
The charging chute 130 may include a movable roll 131 that is movable in a direction crossing a width direction of the charging chute 130. Here, in the charging chute 130, the plurality of rolls are disposed parallel to each other to form a moving path for the mixed raw material. The movable roll 131 may be provided in the lower portion of the charging chute 130, i.e., the lower portion from which the mixed raw material brakes away so as to be movable in the direction crossing the width direction of the charging chute 130, e.g., in at least one direction of a vertical direction and a diagonal direction. Here, the diagonal direction may be a direction crossing the moving direction of the raw material, e.g., a direction perpendicular to the moving direction. That is, in the charging chute 130, at least a portion of the plurality of rolls may be a fixed roll 132 of which an installation position is fixed to maintain the moving path for the mixed raw material at a constant angle, and at least a portion may be the movable roll 131 of which an installation position is variable. Here, the fixed roll 132 may be provided from the upper portion of the charging chute 130 in a longitudinal direction of the charging chute 130, and the movable roll 131 may be provided from the lower portion of the charging chute 130 in the longitudinal direction of the charging chute 130. For example, the movable roll 131 may be provided at the lowermost end of the charging chute 130, at which the mixed raw material breaks away from the moving path formed in the charging chute 130. Here, although the structure in which the movable roll 131 is provided at the lowermost end of the charging chute is described, about two or three movable rolls in addition to the roll disposed at the lowermost end may be provided from the lower portion of the charging chute 130.
FIGS. 2 to 5 are perspective and cross-sectional views of the charging chute constituting the raw material charging apparatus according to an embodiment of the present invention, and FIG. 6 is a schematic view illustrating an example of an elevation unit for driving the movable roll.
First, referring to FIGS. 2 and 3, the plurality of rolls of the fixed roll 132 may be disposed parallel to each other to form the moving path through which the mixed raw material moves. Here, the moving path for the mixed raw material, which is formed by the fixed roll 132, may form a moving path having a cycloid curve shape. The fixed roll 132 may be rotatably provided to rotate in a moving direction of the mixed raw material and in a direction opposite to the moving direction. This is done for controlling the rotation direction according to a charging amount of the mixed raw material, a moisture content of the mixed raw material, and a particle size of the mixed raw material.
The movable roll 131 may be provided at the lowermost end of the charging chute 130, for example, may be provided to be movable in an upward/downward direction, e.g., in a vertical direction. Here, the movable roll 131 may be provided to be rotatable at a position adjacent to the lowermost fixed roll 132 of the fixed rolls 132, for example, a first fixed roll 132a. The movable roll 131 may vertically move according to a change in layer thickness, the particle size of the mixed raw material, or the moisture content of the mixed raw material to adjust a moving distance or moving speed of the mixed raw material discharged to the sintering car 200.
Also, referring to FIGS. 4 and 5, the movable roll 131 may be provided at the lowermost end of the charging chute 130 and also be provided to be movable in the direction crossing the moving direction of the mixed raw material, e.g., the direction perpendicular to the moving direction. Here, the movable roll 131 may be provided to be diagonally movable in a direction that is inclined downward with respect to the moving direction of the mixed raw material. Also, the movable roll 131 may be provided to be rotatable at a position adjacent to the lowermost fixed roll 132 of the fixed rolls 132, for example, the first fixed roll 132a. The movable roll 131 may diagonally move in the direction perpendicular to the moving direction of the mixed raw material according to the change in layer thickness, the particle size of the mixed raw material, or the moisture content of the mixed raw material to adjust the moving distance or moving speed of the mixed raw material discharged to the sintering car 200.
As described above, an elevation unit 300 supporting the movable roll 131 to allow the movable roll 131 to move in the vertical direction or in the direction crossing the moving direction of the mixed raw material and a driving unit providing rotation force to allow the movable roll 131 to rotate may be provided.
Various constituents such as a cylinder, a screw shaft, a hydraulic jack, and the like may be used as the elevation unit 300. In this embodiment, an example in which the screw shaft is used as the elevation unit 300 will be described.
Referring to FIG. 6, the elevation unit may include a support frame 310 provided on each of both sides of the movable roll 131 and a connection member 320 connecting the movable roll 131 to the support frame 310 so that the movable roll 131 is movable in the vertical direction. Here, a contact member 330 such as a bearing may be provided between the movable roll 131 and the connection member 320 so that the movable roll 131 is rotatably connected to the connection member 320.
The support frame 310 may be disposed in a longitudinal direction of the movable roll 131, for example, in a direction crossing a width direction of the charging chute 130. That is, since the movable roll 131 is provided to be movable in the vertical direction or the direction crossing the moving direction of the raw material, the support frame 310 may be provided to extend in the moving direction of the movable roll 131. For example, as illustrated in FIG. 2, when the movable roll 131 moves in the vertical direction, the support frame 310 may be provided to extend in the vertical direction. Also, as illustrated in FIG. 4, when the movable roll 131 moves in the direction crossing the moving direction of the raw material, i.e., in the diagonal direction, the support frame 310 may be disposed in the longitudinal direction of the movable roll 131, for example, in the direction crossing the width direction of the charging chute 130. More particularly, a lower portion of the support frame 310 may be disposed to be inclined downward in the moving direction of the mixed raw material. Thus, the movable roll 131 may ascend and descend in the longitudinal direction of the support frame 310 to move in the diagonal direction.
A screw thread may be formed on an outer circumferential surface of the support frame 310. The support frame 310 may be rotatably provided. A grip part 314 may be provided on the support frame 310 so that the support frame 310 directly rotates by a worker. When the support frame 310 automatically rotates, a separate power part (not shown) may be connected. In the latter case, a sensor (not shown) for measuring a height of the movable roll 131 and a control part (not shown) for controlling the power part by using the result measured by the sensor may be provided so that the support frame 310 rotates to automatically adjust the height of the movable roll 131.
Also, the connection member 320 may have a ring shape surrounding at least a portion of the support frame 310. A screw thread may be formed on an inner circumferential surface of the connection member 320 and thus be engaged with a screw thread formed on an outer circumferential surface of the support frame 310. Due to this configuration, when the support frame 310 rotates, the connection member 320 may move in the longitudinal direction of the support frame 310 to allow the movable roll 131 to move in the vertical direction or diagonally move in the direction crossing the moving direction of the raw material.
The contact member 330 may be provided between the movable roll 131 and the connection member 320 so that the rotation force is not transmitted to the connection member even though the movable roll 131 rotates. As described above, the bearing may be used as the contact member 330. One side of the contact member 330, which is connected to the connection member 320, may become a fixed side, and the other side of the contact member 330, which is connected to the movable roll 131, may become a free side.
The driving unit may include a driver 350 providing rotation force and a motion transmitting member 340 transmitting the rotation force provided from the driver 350 to the movable roll 131. Here, the motion transmitting member 340 may be provided between the movable roll 131 and the contact member 330 and be provided as a gear box including various gears.
Due to this configuration, the raw material charging apparatus may adjust a position, e.g., a height of the movable roll 131 without adjusting a position, angle, and height of the charging chute 130 to quickly respond to the fluctuation of the operation condition. That is, when the height of the movable roll 131 is changed, an angle of the lowermost end of the charging chute 130, which has the greatest influence when charging the mixed raw material into the sintering car 200, may be freely adjusted to quickly response the fluctuation of the operation condition.
For example, when the movable roll 131 is disposed to be movable in the vertical direction, the movable roll 131 may have a maximum height of the raw material layer that is capable of being changed into the sintering car 200, for example, a height corresponding to 1500 mm (layer thickness) as an initial height. The initial height herein means a maximum height when the movable roll 131 moves in the vertical direction, and the movable roll 131 may only move downward from the initial height. This is done because, when the movable roll 131 ascends, the movable roll 131 may act as an obstacle with respect to the transferring of the mixed raw material to affect the movement of the mixed raw material.
Thus, when the fluctuation of the layer thickness occurs, for example, the height of the raw material layer charged into the sintering car 200 is less than 1500 mm, the movable roll 131 may move downward according to a difference in height to adjust a height or angle, at which the mixed raw material breaks away from the charging chute 130, thereby preventing pressure charging or light charging within the sintering car 200 from occurring. The detailed contents thereof will be described later.
Also, when the movable roll 131 is disposed to be movable in the direction crossing the moving direction of the raw material, the movable roll 131 may have a reference height of the raw material layer to be charged into the sintering car 200 when common sintered ore is produced, for example, a height corresponding to 1200 mm (layer thickness) as a reference height. The reference height herein may mean a height corresponding to the height of the raw material layer charged into the sintering car 200 when the sintered ore is produced, i.e., a height at which an angle similar to the angle of the movable roll 131 with respect to the moving path formed by the fixed roll 132. Here, the movable roll 131 may be movable upward and downward from the reference height.
Thus, when the fluctuation of the layer thickness occurs, for example, the height of the raw material layer charged into the sintering car 200 is greater or less than 1200 mm, the movable roll 131 may diagonally move according to a difference in height to ascend or descend and thereby to adjust a height or angle, at which the mixed raw material breaks away from the charging chute 130, thereby preventing the pressure charging or the light charging within the sintering car 200 from occurring. The detailed contents thereof will be described later.
Although the case in which the charging chute is provided as the plurality of rolls has been described above, the charging chute may include an inclined plate having a predetermined area.
FIG. 7 is a schematic view of a raw material charging apparatus according to a modified example of the present invention, and FIG. 8 is a perspective view of a charging chute constituting the raw material charging apparatus according to an embodiment of the present invention.
Referring to FIG. 7, a charging chute 1300 is provided between the raw material hopper 100 and a sintering car 200 to charge a mixed raw material 1 into the sintering car 200. The charging chute 1300 may include a movable roll that is movable in a direction crossing a width direction of the charging chute 1300. Here, the charging chute 1300 may include an upper charging chute 1230 extending in one direction and having a plate shape at an upper portion thereof to form a moving path through which the mixed raw material 1 moves and a lower charging chute 1310 provided to be movable in a direction crossing a width direction of the upper charging chute 1320 and having a roll shape at a lower portion thereof, for example, a movable roll. Here, the upper charging chute 1320 may be provided to be inclined downward toward the sintering car 200, and the moving path formed in the upper charging chute 1320 may be formed to have a linear or curved transverse cross-sectional shape. Also, here, when the upper charging chute 1320 has the moving path with the curved cross-sectional shape, the moving path may have a cycloid curve shape.
Also, the lower charging chute 1310 may be disposed along the width direction of the upper charging chute 1320 below the upper charging chute 1320 and provided to be movable in the direction crossing the width direction of the upper charging chute 1320. The lower charging chute 1310 may be rotatably provided to rotate in the moving direction of the mixed raw material and in a direction opposite to the moving direction. Thus, the lower charging chute 1310 may adjust a breakaway speed or angle at which the raw material is charged into the sintering car 200.
Referring to FIG. 8, the charging chute 1300 may include the upper charging chute 1320 having the plate shape and the lower charging chute 1310 having the roll shape and disposed along the width direction of the upper charging chute 1320 below the upper charging chute 1320. Here, the lower charging chute 1310 may be provided to be movable in the direction crossing the width direction of the upper charging chute 1320 below the upper charging chute 1320. Also, the lower charging chute 1310 may be rotatably provided.
The upper charging chute 1320 may form a substantial moving path through which the raw material fed from the raw material hopper 100 moves, and the lower charging chute 1310 may adjust an angle and height at which the mixed raw material 1 breaks away from the charging chute 1300 when the mixed raw material 1 moving along the upper charging chute 1320 is charged into the charging car 200. That is, the upper charging chute 1320 may be fixed in installation position to maintain the path, through which the mixed raw material moves, at a constant angle, and the lower charging chute 1310 may be changeable in position to adjust the angle and height, at which the mixed raw material breaks away from the charging chute 1300 just before the mixed raw material 1 is charged into the sintering car 200. Here, although the lower charging chute 1310 is provided as one roll, the lower charging chute 1310 may include a plurality of rolls as necessary.
The upper charging chute 1320 may form the moving path through which the mixed raw material moves so that the mixed raw material discharged from a drum feeder 120 is maintained in a state in which particles of the mixed raw material are granulated and classified.
The lower charging chute 1310 may be provided to be movable in the direction crossing the width direction of the upper charging chute 1320. Here, the direction crossing the width direction of the upper charging chute 1320 may mean at least one direction of a vertical direction, a diagonal direction, and a horizontal direction.
As described above, the lower charging chute 1310 may move in the direction crossing the width direction of the upper charging chute 1320 according to an operation condition, for example, a change in layer thickness, a particle size of the mixed raw material, or a moisture content of the mixed raw material to adjust at least one of the height and angle at which the mixed raw material breaks away from the charging chute 1300 and thereby to adjust a moving distance or moving speed of the mixed raw material discharged to the sintering car 200, thereby controlling a charging pattern of the mixed raw material.
An elevation unit 300 supporting the lower charging chute 1310 to allow the lower charging chute 1310 to move and a driving unit providing rotation force to allow the lower charging chute 1310 to rotate may be provided.
The elevation unit 300 may have a structure that is substantially similar to that of the elevation unit according to the foregoing embodiment and may change an arranged shape of a support frame 310 according to the moving direction of the lower charging chute 1310. That is, the support frame 310 may be disposed in one direction of the vertical direction, the diagonal direction, and the horizontal direction according to the moving direction of the lower charging chute 1310 and thus used as the moving path of the lower charging chute 1310. When the lower charging chute 1310 move in the vertical direction, the support frame 310 may be disposed to extend in a direction perpendicular to a horizontal surface. Also, when the lower charging chute 1310 moves in the diagonal direction, i.e., in the direction perpendicular to the moving direction of the mixed raw material, a lower portion of the support frame 310 may be disposed to be inclined downward. Also, both sides of the support frame may be disposed to be inclined downward in the moving direction of the mixed raw material. Also, when the lower charging chute 1310 moves in the horizontal direction, the support frame 310 may be disposed parallel to the horizontal surface or the ground surface.
Hereinafter, a method for charging a mixed raw material into a sintering car by using the raw material charging apparatus according to the present invention will be described.
FIGS. 9 and 10 are views illustrating an example in which a raw material is charged by using the raw material charging apparatus according to an embodiment of the present invention, FIGS. 11 to 13 are views for explaining another example in which the raw material is charged by using the raw material charging apparatus according to an embodiment of the present invention, and FIGS. 14 to 17 are views illustrating a moving state of a lower charging chute according to a modified example of the present invention.
First, an example in which a movable roll 131 moves in a vertical direction will be described with reference to FIGS. 9 and 10.
An arrangement relationship between fixed rolls 132 and the movable roll 131, which constitute a charging chute 130, will be described.
When a virtual line connecting centers of the plurality of fixed rolls 132 to each other is defined as a first line L1, the first line L1 may have the same curvature as that of a moving path formed in an upper portion of each of the fixed rolls 132. Also, a line extending from a center of a first fixed roll 132a, which is disposed at the lowermost end, of the fixed rolls 132 in a horizontal direction may be defined as a second line L2. Also, an angle that is defined by the first line L1 and the second line L2 may be a first angle a, and the first angle a may be an angle at which the mixed raw material moves on the fixed rolls 132. However, when the fixed roll 132 forms a moving path having a cycloid curve shape, an angle at which the mixed raw material moves may vary while the mixed raw material moves above the fixed roll 132.
Also, a line connecting a center of the first fixed roll 132a to a center of the movable roll 131 is defined as a third line L3, and a line extending from the center of the movable roll 131 in th horizontal direction is defined as a fourth line L4. Here, an angle defined by the third line L3 and the fourth line L4 is defined as a second angle a0 that is an angle at which the mixed raw material breaks away from the charging chute 130.
According to the present invention, the movable roll 131 may move in the vertical direction according to an operation condition to change the second angle a0, thereby controlling a height and speed at which the mixed raw material breaks away from the charging chute 130.
For example, as illustrated in FIGS. 9(a) and 9(b), when the mixed raw material is charged at a maximum height H0, for example, 1500 mm at which the mixed raw material is charged into the sintering car 200, the movable roll 131 may be maintained at an initial height. Here, the first angle a and the second angle a0 may be the same or similar to each other.
On the other hand, as illustrated in FIG. 10(a), when the mixed raw material is charged at a height H1, i.e., 900 mm, the movable roll 131 may move downward. Here, since the center of the movable roll 131 moves downward, as illustrated in FIG. 10(b), the second angle a1 defined by the third line L3 and the fourth line L4 may further increase than the second angle a0 defined by the third line L3 and the fourth line L4 before the movable roll 131 moves.
When a raw material layer formed in the sintering car 200 decreases in height, the mixed raw material may break away from the charging chute 130 to increase in moving distance up to the sintering car 200, and thus, pressure charging may occur by acceleration due to the increase of the moving distance. Thus, the movable roll 131 may move downward to reduce a distance between the movable roll 131 and the sintering car 200. When the distance between the movable roll 131 and the sintering car 200 is reduced, the moving distance of the mixed raw material that breaks away from the charging chute 130 may be reduced, and also, the acceleration added to the moving speed of the mixed raw material by the reduced moving distance may be reduced to suppress the pressure charging within the sintering car 200 or prevent the pressure charging within the sintering car 200 from occurring. Also, since the angle at which the mixed raw material breaks away from the charging chute 130, i.e., the angle a1 defined by the third line L3 and the fourth line L4 increases to change the moving path of the mixed raw material, when the mixed raw material breaks away from the movable roll 131 because it is difficult to maintain the moving speed of the mixed raw material on the fixed roll 132, the mixed raw material may be charged into the sintering car 200 in a state in which the moving speed of the mixed raw material is reduced to prevent the pressure charging from occurring.
As described above, when the pressure charging within the sintering car 200 is suppressed or prevented, air permeability within the raw material layer may be secured to improve sintering efficiency, thereby obtaining sintered ore having the uniform strength.
When the movable roll 131 descends, the movable roll 131 and the first fixed roll 132a may be spaced apart from each other to form a space around the movable roll 131. Thus, the mixed raw material having a relatively small particle size, e.g., fine coke may be discharged through the space so as to be charged into an upper layer portion of the raw material layer within the sintering car 200. As described above, when the mixed raw material having the relatively small particle size is charged into the upper layer portion of the raw material layer within the sintering car 200, the air permeability within the raw material layer may be improved to perform smooth sintering reaction, thereby improving quality and productivity of the sintered ore.

Table 1 below shows a moving distance of the movable roll 131, i.e., a spaced distance between the first fixed roll 132a and the movable roll 131 according to the downwardly moving distance and the angle (the second angle) at which the mixed raw material breaks away from the movable roll 131. Table 1 shows an example in which the distance between the first fixed roll 132a and the movable roll 131 or a numerical value of the second angle may be variously changed.

[Table 1]

Vertical moving distance (hmm)	Distance between first fixed roll and movable (pmm)	Second angle (a1°)
0	4.12	41.4
10	8.82	44.1
20	13.34	46.55
30	17.64	48.8
40	21.73	50.9
50	25.59	52.78

Referring to Table 1 above, when the movable roll 131 moves downward, the moving distance of the movable roll 131 may increase to increase in distance between the first fixed roll 132a and the movable roll 131. Here, when the distance between the first fixed roll 132a and the movable roll 131 excessively increases, since vertical segregation of the raw material layer within the sintering car 200 may not be performed smoothly, it is preferable that the movable roll 131 does not excessively move. Also, it is seen that the more the moving distance of the movable roll 131 increases, the more the angle at which the mixed raw material breaks away from the movable roll 131 increases. Here, when the breakaway angle of the mixed raw material excessively increases, the excessive breakaway angle may adversely affect the vertical segregation of the raw material layer within the sintering car 200. Thus, it is preferable that the movable roll 131 properly moves to smoothly perform the charging pattern and the vertical segregation of the raw material layer within the sintering car 200.
Also, it may be possible to control a rotation direction of the movable roll 131 together with the movement of the movable roll 131 according to a particle size, a moisture content, and a charging amount of the mixed raw material charged into the sintering car 200.
For example, when the particle size of the mixed raw material is small, or the moisture content is high, the mixed raw material may be attached to the charging chute 130 or be reduced in moving speed due to friction thereof to cause light charging . In this case, the movable roll 131 may rotate in the moving direction of the mixed raw material to increase in charging speed of the mixed raw material, i.e., a speed at which the mixed raw material breaks away from the charging chute 130. Here, the movable roll 131 may rotate at a speed quicker than the moving speed of the mixed raw material. On the other hand, when an amount of mixed raw material charged into the sintering car 200 is large, pressure charging may occur. In this case, it is necessary that the movable roll 131 rotates in a direction opposite to the moving direction of the mixed raw material to reduce the charging speed of the mixed raw material. Here, when the rotation speed of the movable roll 131 is excessively high, the vertical segregation of the raw material layer within the sintering car 200 may not be formed. Thus, the movable roll 131 may rotate at a speed less than the moving speed of the mixed raw material.
In this method, when the mixed raw material is charged into the sintering car 200, a charging pattern within the sintering car 200 may be constantly maintained by quickly responding to the operation condition without changing the overall structure of the charging chute 130. Thus, even though the operation condition is fluctuated, the occurrence of the pressure charging or the light charging within the sintering car 200 may be suppressed to constantly maintain the air permeability, thereby producing the high-quality sintered ore having the uniform strength.
Next, an example in which the movable roll 131 moves in the direction crossing the moving direction of the raw material will be described with reference to FIGS. 11 to 13.
First, an arrangement relationship between the fixed roll 132 and the movable roll 131, which constitute the charging chute 130, will be described with reference to FIGS. 11 to 13.
When a virtual line connecting centers of the plurality of fixed rolls 132 to each other is defined as a first line L1, the first line L1 may have the same curvature as that of a moving path formed in an upper portion of each of the fixed rolls 132. Also, a line extending from a center of a first fixed roll 132a, which is disposed at the lowermost end, of the fixed rolls 132 in a horizontal direction may be defined as a second line L2. Also, an angle that is defined by the first line L1 and the second line L2 may be a first angle a, and the first angle a may be an angle at which the mixed raw material moves on the fixed rolls 132. However, when the fixed roll 132 forms a moving path having a cycloid curve shape, an angle at which the mixed raw material moves may vary while the mixed raw material moves above the fixed roll 132.
Also, a line connecting a center of the first fixed roll 132a to a center of the movable roll 131 is defined as a third line L3, and a line extending from the center of the movable roll 131 in th horizontal direction is defined as a fourth line L4. Here, when the movable roll 131 is disposed at the reference height, the third line L3 may be the moving path for the mixed raw material, and an angle defined by the third line L3 and the fourth line L4 may be a second angle a0 that is an angle at which the mixed raw material breaks away from the charging chute 130.
Also, when the movable roll 131 is disposed at the reference height, a line extending perpendicular to the third line L3 that is the moving path of the mixed raw material is defined as a moving line L0.
According to the present invention, the movable roll 131 may move along the moving line L0 according to the operation condition to change the second angle a0 that is the angle at which the mixed raw material breaks away from the charging chute 130, thereby controlling a height and speed at which the mixed raw material breaks away from the charging chute 130.
For example, as illustrated in FIGS. 11(a) and 11(b), when the height of the mixed raw material charged into the sintering car 200 under the common operation condition, e.g., a first height H0 is 1200 mm, the movable roll 131 may be maintained at the reference height. Here, the first angle a and the second angle a0 may be the same or similar to each other.
On the other hand, as illustrated in FIG. 12(a), when the mixed raw material is charged at a second height H1 that is less than the first height H0, i.e., 900 mm, the movable roll 131 may move downward along the moving line L0. Here, since the center of the movable roll 131 moves downward, as illustrated in FIG. 12(b), an angle a1 defined by a third line L3' and the fourth line L4 may further increase than the angle a0 defined by the third line L3 and the fourth line L4 before the movable roll 131 moves.
When a raw material layer formed in the sintering car 200 decreases in height, the mixed raw material may break away from the charging chute 130 to increase in moving distance up to the sintering car 200, and thus, pressure charging may occur by acceleration due to the increase of the moving distance. Thus, the movable roll 131 may diagonally move downward from the reference height to reduce a distance between the movable roll 131 and the sintering car 200. When the distance between the movable roll 131 and the sintering car 200 is reduced, the moving distance of the mixed raw material that breaks away from the charging chute 130 may be reduced, and also, the acceleration added to the moving speed of the mixed raw material by the reduced moving distance may be reduced to suppress the pressure charging within the sintering car 200 or prevent the pressure charging within the sintering car 200 from occurring. Also, since the angle at which the mixed raw material breaks away from the charging chute 130, i.e., the angle a1 defined by the third line L3' and the fourth line L4 increases to change the moving path of the mixed raw material, when the mixed raw material breaks away from the movable roll 131 because it is difficult to maintain the moving speed of the mixed raw material on the fixed roll 132, the mixed raw material may be charged into the sintering car 200 in a state in which the moving speed of the mixed raw material is reduced to prevent the pressure charging from occurring.
As described above, when the pressure charging within the sintering car 200 is suppressed or prevented, air permeability within the raw material layer may be secured to improve sintering efficiency, thereby obtaining sintered ore having the uniform strength.
When the movable roll 131 moves, the movable roll 131 and th first fixed roll 132a may be spaced apart from each other, and thus, the mixed raw material having a relatively small particle size, e.g., fine coke may be discharged through the space so as to be charged into an upper layer portion of the raw material layer within the sintering car 200. As described above, when the mixed raw material having the relatively small particle size is charged into the upper layer portion of the raw material layer within the sintering car 200, the air permeability within the raw material layer may be improved to perform smooth sintering reaction, thereby improving quality and productivity of the sintered ore.
Also, as illustrated in FIG. 13(a), when the mixed raw material is charged at a third height H2 that is greater than the first height H0, i.e., 1500 mm, the movable roll 131 may move upward along the moving line L0. Here, the center of the movable roll 131 moves upward, and as illustrated in FIG. 13(b), an angle a1 defined by a third line L3' and the fourth line L4 may further decrease than the angle a0 defined by the third line L3 and the fourth line L4 before the movable roll 131 moves.
When a raw material layer formed in the sintering car 200 increases in height, the mixed raw material may break away from the charging chute 130 to decrease in moving distance up to the sintering car 200, and thus, light charging may occur. Thus, the movable roll 131 may diagonally move upward from the reference height to increase in distance between the movable roll 131 and the sintering car 200. When the distance between the movable roll 131 and the sintering car 200 increases, the moving distance of the mixed raw material that breaks away from the charging chute 130 may increase, and also, the acceleration added to the moving speed of the mixed raw material by the increasing moving distance may increase to suppress the light charging within the sintering car 200 or prevent the light charging within the sintering car 200 from occurring.

Table 2 below shows a moving distance of the movable roll 131, i.e., a spaced distance between the first fixed roll 132a and the movable roll 131 according to the diagonally moving distance and the angle (the second angle) at which the mixed raw material breaks away from the movable roll 131. Table 2 shows an example in which the distance between the first fixed roll 132a and the movable roll 131 or a numerical value of the second angle may be variously changed.

[Table 2]

Diagonal moving distance (hmm)	Distance between first fixed roll and movable (pmm)	Second angle (a1°)
20 (Upward)	6.65	34.06
10 (Upward)	4.62	37.71
(Reference height)	4.12	41.4
10 (Downward)	3.66	45.15
20 (Downward)	3.65	48.88
30 (Downward)	3.98	52.58

Referring to Table 2 above, when the movable roll 131 moves diagonally, the moving distance of the movable roll 131 may increase to increase in distance between the first fixed roll 132a and the movable roll 131. Here, when the distance between the first fixed roll 132a and the movable roll 131 excessively increases, since vertical segregation of the raw material layer within the sintering car 200 may not be performed smoothly, it is preferable that the movable roll 131 does not excessively move.
Also, it is seen that when the movable roll 131 diagonally moves upward, the second angle a2 that is the breakaway angle of the mixed raw material decreases, and when the movable roll 131 diagonally moves downward, the second angle a1 that is the breakaway angle of the mixed raw material increases. As described above, the movable roll 131 may diagonally move to adjust the breakaway angle of the mixed raw material, thereby properly adjusting the charging pattern within the sintering car according to the fluctuation of the operation condition.
It may be possible to control a rotation direction of the movable roll 131 together with the diagonal movement of the movable roll 131 according to a particle size, a moisture content, and a charging amount of the mixed raw material charged into the sintering car 200.
For example, when the particle size of the mixed raw material is small, or the moisture content is high, the mixed raw material may be attached to the charging chute 130 or be reduced in moving speed due to friction thereof to cause light charging . In this case, the movable roll 131 may rotate in the moving direction of the mixed raw material to increase in charging speed of the mixed raw material, i.e., a speed at which the mixed raw material breaks away from the charging chute 130. Here, the movable roll 131 may rotate at a speed quicker than the moving speed of the mixed raw material. On the other hand, when an amount of mixed raw material charged into the sintering car 200 is large, pressure charging may occur. In this case, it is necessary that the movable roll 131 rotates in a direction opposite to the moving direction of the mixed raw material to reduce the charging speed of the mixed raw material. Here, when the rotation speed of the movable roll 131 is excessively high, the vertical segregation of the raw material layer within the sintering car 200 may not be formed. Thus, the movable roll 131 may rotate at a speed less than the moving speed of the mixed raw material.
In this method, when the mixed raw material is charged into the sintering car 200, a charging pattern within the sintering car 200 may be constantly maintained by quickly responding to the operation condition without changing the overall structure of the charging chute 130. Thus, even though the operation condition is fluctuated, the occurrence of the pressure charging or the light charging within the sintering car 200 may be suppressed to constantly maintain the air permeability, thereby producing the high-quality sintered ore having the uniform strength.
Next, a method for charging the mixed raw material into the sintering car by using the raw material charging apparatus according to the modified example of the present invention will be described with reference to FIGS. 14 to 17.
First, an arrangement relationship between an upper charging chute 1320 and a lower charging chute 1310, which constitute a charging chute 1300, in an initial state before the lower charging chute 1310 moves will be described with reference to FIG. 14.
A line formed along a top surface of the upper charging chute 1320 is defined as a first line L1. Here, the first line L1 may be the same as a moving path formed in an upper portion of the upper charging chute 1320. Also, a line extending from an end of the upper charging chute 1320 adjacent to the lower charging chute 1310 in a horizontal direction is defined as a second line L2. Also, an angle that is defined by the first line L1 and the second line L2 may be a first angle a, and the first angle a may be an angle at which the mixed raw material moves on the upper charging chute 1320. However, when the upper charging chute 1320 forms a moving path having a cycloid curve shape, an angle at which the mixed raw material moves may vary while the mixed raw material moves above the upper charging chute 1320.
A line connecting an end of the upper charging chute 1320 to an outer circumferential surface of the lower charging chute 1310 is defined as a third line L3, and a line extending from the third line L3 contacting the outer circumferential surface of the lower charging chute 1310 in a horizontal direction is defined as a fourth line L4. Also, an angle defined by the third line L3 and the fourth line L4 is defined as a second angle a0. Here, the third line L3 may indicate a direction in which the mixed raw material breaks away from the charging chute 130, and the second angle a0 may indicate an angle at which the mixed raw material breaks away from the charging chute 130.
According to the present invention, the lower charging chute 1320 may move in a direction crossing a width direction of the upper charging chute 1320 according to the operation condition to change the second angle a0 that is the angle at which the mixed raw material breaks away from the charging chute 130, thereby controlling a height and speed at which the mixed raw material breaks away from the charging chute 130.
FIG. 15 illustrates an example in which the lower charging chute 1310 moves in the vertical direction, i.e., a state in which the lower charging chute 1310 moves downward in the initial state illustrated in FIG. 14. Here, the lower charging chute 1310 may descend in a direction that is vertical or perpendicular to the ground surface.
For example, the mixed raw material is charged at a maximum height at which the mixed raw material is capable of being charged into the sintering car, for example, a height of 1200 mm, the lower charging chute 1310 may be maintained in the initial state. Here, the first angle a and the second angle a0 may be the same or similar to each other.
On the other hand, when the mixed raw material is charged at a height of 900 mm into the sintering car, the lower charging chute 1310 may descend. Here, the lower charging chute 1310 may move along the line extending from a center of the lower charging chute 1310 in the direction perpendicular to a horizontal surface, e.g., the moving line L0. As illustrated in FIG. 15, the second angle a1 defined by the third line L3 and the fourth line L4 may further increase than the second angle a0 defined by the third line L3 and the fourth line L4 before the lower charging chute 1310 moves.
When a raw material layer formed in the sintering car 200 decreases in height, the mixed raw material may break away from the charging chute 130 to increase in moving distance up to the sintering car 200, and thus, pressure charging may occur by acceleration due to the increase of the moving distance. Thus, the lower charging chute 1310 may move downward to reduce a distance between the lower charging chute 1310 and the sintering car 200. When the distance between the lower charging chute 1310 and the sintering car 200 is reduced, the moving distance of the mixed raw material that breaks away from the charging chute 130 may be reduced, and also, the acceleration added to the moving speed of the mixed raw material by the reduced moving distance may be reduced to suppress the pressure charging within the sintering car 200 or prevent the pressure charging within the sintering car 200 from occurring. Also, since the angle at which the mixed raw material breaks away from the charging chute 130, i.e., the angle a1 defined by the third line L3 and the fourth line L4 increases to change the moving path of the mixed raw material, when the mixed raw material breaks away from the lower charging chute 1310 because it is difficult to maintain the moving speed of the mixed raw material on the upper charging chute 1320, the mixed raw material may be charged into the sintering car 200 in a state in which the moving speed of the mixed raw material is reduced to prevent the pressure charging from occurring.
FIG. 16 illustrates an example in which the lower charging chute 1310 moves in a direction perpendicular to the moving direction of the mixed raw material, i.e., in a diagonal direction. Here, like the example in which the lower charging chute 1310 moves in the vertical direction, the lower charging chute 1310 may move downward to adjust the angle and height at which the mixed raw material breaks away from the charging chute 130. However, this example is different from the above-described example in that the direction in which the lower charging chute 1310 moves is a direction perpendicular to the moving direction of the mixed raw material. Here, the moving line L0 of the lower charging chute 1310 may extend from the center of the lower charging chute 1310 in the moving direction of the mixed raw material in the upper charging chute 1320, i.e., the first lien L1.
FIG. 17 illustrates an example in which the lower charging chute 1310 moves in the horizontal direction. Here, the lower charging chute 1310 may move forward or backward in a longitudinal direction of the lower charging chute 1310, i.e., the direction perpendicular to the width direction of the upper charging chute 1320 in a state in which the height of the lower charging chute 1310 is maintained as it is. Here, the moving line of the lower charging chute 1310 may extend from the center of the lower charging chute 1310 in the horizontal direction.
When the lower charging chute 1310 moves backward, as illustrated in FIG. 17(a), the angle at which the mixed raw material breaks away from the charging chute 130, i.e., the second angle a1 may further increase than that in the initial state. Thus, when the mixed raw material charged into the sintering car 200 decreases in height, for example, when the height of the mixed raw material is lower than that when the lower charging chute 1310 is maintained in the initial state, this may be applied.
On the other hand, when the lower charging chute 1310 moves backward, as illustrated in FIG. 17(b), the angle at which the mixed raw material breaks away from the charging chute 130, i.e., the second angle a1 may further decrease than that in the initial state. Thus, when the mixed raw material charged into the sintering car 200 increases in height, for example, when the moisture content within the mixed raw material is higher, or the particle size of the mixed raw material is larger than when the lower charging chute 1310 is maintained in the initial state, this may be applied.
As described above, the lower charging chute 1310 may move according to the fluctuation of the operation condition to adjust the breakaway angle of the mixed raw material, thereby properly adjusting the charging pattern within the sintering car according to the fluctuation of the operation condition.
Also, although not shown, it may be possible to control a rotation direction of the lower charging chute 1310 together with the movement of the lower charging chute 1310 according to a particle size, a moisture content, and a charging amount of the mixed raw material charged into the sintering car 200.
For example, when the particle size of the mixed raw material is small, or the moisture content is high, the mixed raw material may be attached to the upper charging chute 1320 or be reduced in moving speed due to friction thereof to cause light charging . In this case, the lower charging chute 1310 may rotate in the moving direction of the mixed raw material to increase in charging speed of the mixed raw material, i.e., a speed at which the mixed raw material breaks away from the charging chute 130. Here, the lower charging chute 1310 may rotate at a speed quicker than the moving speed of the mixed raw material. On the other hand, when an amount of mixed raw material charged into the sintering car 200 is large, pressure charging may occur. In this case, it is necessary that the lower charging chute 1310 rotates in a direction opposite to the moving direction of the mixed raw material to reduce the charging speed of the mixed raw material. Here, when the rotation speed of the lower charging chute1310 is excessively high, the vertical segregation of the raw material layer within the sintering car 200 may not be formed. Thus, the lower charging chute 1310 may rotate at a speed less than the moving speed of the mixed raw material.
In this method, when the mixed raw material is charged into the sintering car 200, a charging pattern within the sintering car 200 may be constantly maintained by quickly responding to the operation condition without changing the overall structure of the charging chute 130. Thus, even though the operation condition is fluctuated, the occurrence of the pressure charging or the light charging within the sintering car 200 may be suppressed to constantly maintain the air permeability, thereby producing the high-quality sintered ore having the uniform strength.
As described above, while this invention has been particularly shown and described with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the scope of the invention is defined not by the detailed description of the invention but by the appended claims, and all differences within the scope will be construed as being included in the present invention.

INDUSTRIAL APPLICABILITY

In the raw material charging apparatus and the charging method thereof according to the embodiment of the present invention, the air permeability within the raw material layer in the sintering process may be constantly maintained to produce the sintered ore having the uniform strength, thereby improving the process efficiency and the productivity.

Claims

A raw material charging apparatus, which comprises a charging chute disposed between a raw material feeding part and a container to charge a raw material into the container,
wherein the charging chute comprises a movable roll, which is movable in a direction crossing a width direction of the charging chute, in at least a portion thereof.
The raw material charging apparatus of claim 1, wherein the charging chute comprises a plurality of fixed rolls that are disposed parallel to each other to form a moving path for the raw material, and
the movable roll is disposed below the fixed rolls from which the raw material breaks away into the container.
The raw material charging apparatus of claim 1, wherein the charging chute comprises an upper charging chute having an area and a plate shape to form the moving path for the raw material, and
the movable roll is disposed on a lower portion of the upper charging chute from which the raw material breaks away into the container.
The raw material charging apparatus of any one of claims 1 to 3, wherein the movable roll is disposed at the lowermost end in a direction in which the raw material moves in the charging chute.
The raw material charging apparatus of claim 4, wherein at least a portion of the moving path has a linear or curved cross-sectional shape.
The raw material charging apparatus of claim 5, wherein at least a portion of the moving path has a cycloid curved cross-sectional shape.
The raw material charging apparatus of claim 6, further comprising an elevation unit that allows the movable roll to move.
The raw material charging apparatus of claim 7, wherein the elevation unit comprises one of a cylinder, a screw shaft, and a hydraulic jack.
The raw material charging apparatus of claim 8, further comprising a driving unit that allows the movable roll to rotate.
The raw material charging apparatus of claim 9, wherein the movable roll is movable in a vertical direction.
The raw material charging apparatus of claim 9, wherein the movable is movable in a vertical direction or a direction perpendicular to the moving direction of the raw material that moves along the charging chute.
The raw material charging apparatus of claim 9, wherein the movable roll moves forward and backward in the direction crossing the width direction of the charging chute.
A raw material charging method for charging a raw material into a container by using a charging chute forming a moving path for the raw material, the raw material charging method comprising:
allowing a movable roll disposed on a lower portion of the charging chute, from which the raw material breaks away into the container, to move in a direction crossing a width direction of the charging chute; and

feeding the raw material into the charging chute to charge the raw material into the container.
The raw material charging method of claim 13, wherein the allowing of the movable roll to move in the direction crossing the width direction of the charging chute comprises allow the movable roll to move according to at least one of a particle size of the raw material, a moisture content of the raw material, or a charging amount of the raw material.
The raw material charging method of claim 14, wherein the movable roll moves to adjust at least one of a speed or height at which the raw material breaks away from the charging chute.
The raw material charging method of claim 15, wherein the movable roll moves to form a space around the movable roll.
The raw material charging method of claim 16, wherein, while the raw material is charged into the container, a portion of the raw material is discharged into the space to charge the raw material into an upper layer portion of a raw material layer formed in the container.
The raw material charging method of claim 17, wherein, while the raw material is charged into the container, the movable roll rotates.