WO2022138043A1

WO2022138043A1 - Furnace top device

Info

Publication number: WO2022138043A1
Application number: PCT/JP2021/044241
Authority: WO
Inventors: 尚文菅原
Original assignee: 株式会社Ｉｈｉポールワース
Priority date: 2020-12-23
Filing date: 2021-12-02
Publication date: 2022-06-30
Also published as: JPWO2022138043A1; TWI803107B; TW202233852A

Abstract

This furnace top device 1 comprises: a conveyor head cover 22 enclosing the raw-material-input-side end of a conveyor 20; a switching chute 14 that has a receiving port 52 facing a discharge port 62 of the conveyor head cover 22, and that is capable of rotating about the central axis 56 of the receiving port 52; a plurality of furnace top bunkers 10 disposed in parallel around the furnace core, on the vertically downward side of the switching chute 14; and a movable part 70 provided so as to be movable in the conveyor head cover 22. The movable part 70 can be disposed at an intermediate position, which is a position at which at least some of a raw material falling from the conveyor 20 collides.

Description

Fire top device

This disclosure relates to the furnace top device. This application claims the benefit of priority under Japanese Patent Application No. 2020-21403 filed on December 23, 2020, the contents of which are incorporated herein by reference.

For example, Patent Document 1 discloses an example of a top device in which a plurality of top bunker are arranged in parallel around the core and the top bunker into which the raw material is charged is switched by a switching chute.

Japanese Unexamined Patent Publication No. 2016-17197

When the raw material is charged into the furnace top bunker through the switching chute, the raw material may be charged to a position displaced from the desired charging position in the furnace top bunker depending on the direction of the switching chute.

The object of the present disclosure is to provide a furnace top device capable of accurately charging raw materials to a desired position in a furnace top bunker regardless of the direction of the switching chute.

In order to solve the above problems, the furnace top device according to one aspect of the present disclosure has a conveyor head cover surrounding the raw material input side end of the conveyor and a reception port facing the discharge port of the conveyor head cover. It is equipped with a switching chute that can rotate around the central axis, a plurality of furnace top bunker arranged in parallel around the core on the vertically lower side of the switching chute, and a movable part that is movably provided in the conveyor head cover. The movable portion can be arranged at an intermediate position where at least a part of the raw material falling from the conveyor collides.

In addition, the movable part can be moved to a retracted position outside the area where the raw material falling from the conveyor exists, and when the tilt angle of the bottom surface of the movable part with respect to the horizontal plane at the retracted position is the intermediate position. It may be larger than the inclination angle of the bottom surface portion of the movable portion with respect to the horizontal plane.

In addition, the furnace top device further includes a fixed portion that is fixedly arranged on the side opposite to the retracted position with respect to the area where the raw material falling from the conveyor exists, and the movable portion is located at the receiving position that forms the receiving container together with the fixed portion. It may be movable.

In addition, the furnace top device holds the moving part at an intermediate position between the raw material detection unit that detects the end of the raw material charged from the conveyor and the moving part during the charging of the raw material, and responds to the detection of the end of the raw material by the raw material detection unit. A control unit for moving the movable unit from the intermediate position to the retracted position and then moving the movable unit to the receiving position may be further provided.

Further, in the furnace top device, the rotation angle of the switching chute may be set to a rotation angle corrected in the direction toward the movable portion around the core with respect to the reference angle based on the arrangement of the furnace top bunker.

According to the present disclosure, it is possible to accurately put the raw material into a desired position in the furnace top bunker regardless of the direction of the switching chute.

FIG. 1 is a schematic cross-sectional view showing the configuration of the furnace top device according to the first embodiment. FIG. 2 is a schematic perspective plan view of the conveyor head cover seen from vertically above when the movable portion is in the intermediate position. FIG. 3 is a schematic cross-sectional view showing the configuration of the furnace top device when the movable portion is in the retracted position. FIG. 4 is a schematic cross-sectional view showing the configuration of the furnace top device when the movable portion is in the receiving position. FIG. 5 is a schematic perspective plan view of the conveyor head cover seen from vertically above when the movable portion is in the receiving position. 6A and 6B are diagrams illustrating a comparative example furnace top device not provided with a raw material input adjusting device. 7A and 7B are diagrams illustrating a comparative example furnace top device not provided with a raw material input adjusting device. 8A and 8B are diagrams illustrating the operation and effect of the furnace top device 1 of the present embodiment. 9A and 9B are schematic plan views illustrating the setting of the rotation angle of the switching chute.

An embodiment of the present disclosure will be described in detail with reference to the accompanying drawings below. The dimensions, materials, other specific numerical values, etc. shown in the embodiment are merely examples for facilitating understanding, and do not limit the present disclosure unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are designated by the same reference numerals to omit duplicate explanations, and elements not directly related to the present disclosure are omitted from the illustration. do.

FIG. 1 is a schematic cross-sectional view showing the configuration of the furnace top device 1 according to the first embodiment. The furnace top device 1 is provided vertically above the vertical furnace in order to input raw materials into the vertical furnace. The vertical furnace is assumed to be a blast furnace that produces iron from raw materials such as iron ore and coke, but may be any furnace.

The furnace top device 1 includes a furnace top bunker 10, a receiving hopper 12, a switching chute 14, a switching chute drive device 16, a conveyor head pulley 18, a conveyor 20, a conveyor head cover 22, a raw material detection unit 24, a raw material input adjusting device 26, and a movable unit. It includes a drive device 28, an over-deposit prevention sensor 30, and a control unit 32.

The furnace top bunker 10 is a hollow container. A plurality (for example, three) of furnace top bunker 10s are arranged vertically above the vertical furnace, for example. FIG. 1 illustrates one furnace top bunker 10 out of a plurality of top bunker 10. The furnace top bunker 10 is arranged eccentrically with respect to the core of the vertical furnace. The furnace top bunker 10 is arranged in parallel around the core at equal intervals. For example, when the number of the top bunker 10 is 3, the top bunker 10 is arranged in parallel around the core at intervals of 120 degrees. The number of the furnace top bunker 10 is not limited to three, and may be two or four.

At the upper part of the furnace top bunker 10, a raw material input port 40 for communicating the inside and outside of the furnace top bunker 10 is formed. As will be described later, raw materials are charged into the furnace top bunker 10 through the raw material input port 40. The furnace top bunker 10 can store the charged raw materials.

An upper seal valve 42 is provided at the raw material input port 40 of the furnace top bunker 10. The upper seal valve 42 includes a valve seat 44 formed at the end of the raw material input port 40, and a valve body 46 that opens and closes with respect to the valve seat 44. The upper seal valve 42 opens and closes the raw material input port 40, and seals the raw material input port 40 between the valve seat 44 and the valve body 46 when the raw material input port 40 is closed.

Although not shown, a raw material discharge port for communicating the inside and outside of the furnace top bunker 10 is formed at the lower part of the furnace top bunker 10. A flow control gate and a lower seal valve are provided at the raw material discharge port of the furnace top bunker 10. The flow control gate shuts off the discharge of raw materials by closing the raw material discharge port. The lower seal valve shuts off the flow of gas through the raw material outlet. When the flow control gate and the lower seal valve are opened at a predetermined timing, the raw materials in the furnace top bunker 10 are charged into the vertical furnace through the raw material discharge port.

The receiving hopper 12 is arranged vertically above a plurality of furnace top bunker 10s arranged in parallel. The receiving hopper 12 is formed in a hollow shape, and is arranged so that the central axis substantially overlaps the core. In FIG. 1, a part of the receiving hopper is omitted. At the lower part of the receiving hopper 12, lower openings 50 are formed as many as the number of furnace top bunker 10. Each of the lower openings 50 opens toward the raw material input port 40 of the furnace top bunker 10.

The switching chute 14 is arranged at the upper part in the receiving hopper 12. The switching chute 14 is formed in a curved tubular shape that communicates with the inside and outside of the receiving hopper 12. At one end of the switching chute 14, a receiving port 52 that opens vertically upward to the outside of the receiving hopper 12 is formed. At the other end of the switching chute 14, a delivery port 54 that opens toward the lower opening 50 is formed.

The central shaft 56 of the receiving port 52 overlaps the central shaft of the receiving hopper 12 and the core. The switching chute 14 is rotatable around the central axis 56 of the receiving port 52. That is, the switching chute 14 can switch the direction of the delivery port 54, and can select the lower opening 50 facing the delivery port 54.

The switching chute drive device 16 rotates the switching chute 14. The switching chute drive device 16 may be hydraulic or electric. Further, the switching chute driving device 16 has a switching chute position detecting unit that detects the rotation angle of the switching chute 14 (in other words, the rotation position of the switching chute).

The conveyor head pulley 18 is located diagonally above the central axis 56 of the receiving port 52, which is displaced in the radial direction. The conveyor 20 is connected to the conveyor head pulley 18. The conveyor 20 extends from the conveyor head pulley 18 in a direction away from the core. The conveyor 20 is inclined with respect to the horizontal plane so as to proceed vertically downward as the distance from the conveyor head pulley 18 increases.

On the lower end side of the slope of the conveyor 20, a predetermined amount of raw material is placed on the conveyor 20. The conveyor 20 transports the raw material placed on the conveyor 20 to the conveyor head pulley 18 side, which is the upper end side of the inclination. At this time, a predetermined amount of raw materials are continuously transported as a batch in the longitudinal direction of the conveyor 20. The raw material transported to the conveyor head pulley 18 side is charged from the conveyor 20. The alternate long and short dash line in FIG. 1 shows an example of the region where the raw material exists. Further, the arrow of the two-dot chain line in FIG. 1 indicates an example of the moving direction of the raw material. Hereinafter, the end on the conveyor head pulley 18 side of the conveyor 20 may be referred to as the end on the raw material input side.

The conveyor head cover 22 is located vertically above the switching chute 14. The conveyor head cover 22 is a hollow container and is provided so as to surround the raw material input side end of the conveyor 20. The conveyor head cover 22 is provided with an opening 60 in a part of the side surface for communicating the inside and outside of the conveyor head cover 22. A part of the conveyor head pulley 18 and the raw material input side end of the conveyor 20 are inserted into the conveyor head cover 22 through the opening 60 of the conveyor head cover 22.

At the lower part of the conveyor head cover 22, an discharge port 62 for communicating the inside and outside of the conveyor head cover 22 is formed. The discharge port 62 is formed in a circular shape. The reception port 52 of the switching chute 14 faces the discharge port 62 of the conveyor head cover 22. The conveyor head cover 22 is narrowed so that the internal space gradually narrows while the internal shape gradually changes from a square shape to a circular shape as the conveyor head cover 22 advances from the top surface 64 side to the discharge port 62 side. As a result, the slope 66 is formed in the conveyor head cover 22.

The raw material detection unit 24 is provided in the vicinity of the conveyor head pulley 18 on the conveyor 20. The raw material detection unit 24 detects the presence or absence of the raw material input from the conveyor 20 based on the weight of the raw material on the conveyor 20 at the installed position. Specifically, the raw material detection unit 24 is provided at a position where it is assumed that the raw material is charged from the conveyor 20 at a timing predetermined time after the detection. After a predetermined time, it is set to, for example, 10 seconds, but it may be arbitrarily set in consideration of the transport speed of the conveyor 20.

The raw material detection unit 24 detects that there is a raw material on the conveyor 20 when the weight is equal to or more than a predetermined threshold value, and detects that there is no raw material on the conveyor 20 when the weight is less than the predetermined threshold value. From this, the raw material detection unit 24 detects the end of the raw material charged from the conveyor 20 when the weight changes from a state of the predetermined threshold value or more to a state of less than the predetermined threshold value. The end of the raw material indicates the side of the raw materials connected as a batch, which has the latest input timing. Further, the raw material detection unit 24 detects the start end of the raw material charged from the conveyor 20 when the weight changes from a state of less than a predetermined threshold value to a state of a predetermined threshold value or more. The starting point of the raw material indicates the side of the raw materials in a series that is input at the earliest timing.

The raw material input adjusting device 26 is provided in the conveyor head cover 22. In other words, the raw material input adjusting device 26 is located vertically above the discharge port 62 of the conveyor head cover 22.

The raw material input adjusting device 26 has a movable portion 70, a fixing portion 72, and a drive mechanism 74. The movable portion 70 is provided so as to be movable in the conveyor head cover 22. As will be described in detail later, the movable portion 70 can be arranged at each of the intermediate position, the retracted position, and the receiving position, and can be moved to each other between the intermediate position, the retracted position, and the receiving position. The intermediate position exists on the way from the retracted position to the receiving position or on the way from the receiving position to the retracted position.

The intermediate position is the position where at least a part of the raw material falling from the conveyor 20 collides. Further, the intermediate position is a position where the raw material collided with the movable portion 70 falls from the movable portion 70, and the falling path of the raw material falling from the movable portion 70 passes through the center of the receiving port 52. FIG. 1 shows a case where the movable portion 70 is in an intermediate position.

The evacuation position is outside the area where the raw material falling from the conveyor 20 exists. Specifically, the evacuation position is on the opposite side of the conveyor 20 with respect to the area where the raw material falling from the conveyor 20 exists. The receiving position is a position where the movable portion 70 forms a receiving container together with the fixed portion 72.

FIG. 2 is a schematic perspective plan view of the conveyor head cover 22 seen from vertically above when the movable portion 70 is in the intermediate position. Further, FIG. 3 is a schematic cross-sectional view showing the configuration of the furnace top device 1 when the movable portion 70 is in the retracted position. Further, FIG. 4 is a schematic cross-sectional view showing the configuration of the furnace top device 1 when the movable portion 70 is in the receiving position. FIG. 5 is a schematic perspective plan view of the conveyor head cover 22 seen from vertically above when the movable portion 70 is in the receiving position. In the following, the raw material input adjusting device 26 will be described in detail with reference to FIGS. 1 to 5.

The fixed portion 72 is fixedly arranged on the side opposite to the retracted position with respect to the area where the raw material falling from the conveyor 20 exists. The fixed portion 72 is supported on the side surface of the conveyor head cover 22 by the fixed support portion 80.

The fixed portion 72 includes a vertical portion 82, an inclined portion 84, and an end face portion 86. The vertical portion 82 is formed in a plate shape extending in the width direction and the vertical direction of the conveyor 20. The length of the vertical portion 82 in the width direction of the conveyor 20 is longer than the width of the region where the raw material exists on the conveyor 20.

The inclined portion 84 is formed in a plate shape and is continuous from the vertically lower edge of the vertical portion 82. The inclined portion 84 is inclined so as to proceed toward the drop path side of the raw material as it advances vertically downward. The angle of the inclined portion 84 with respect to the horizontal plane is equal to or larger than the angle of repose of the raw material.

The end face portions 86 are provided at both ends of the conveyor 20 in the vertical portion 82 and the inclined portion 84 in the width direction. The end face portion 86 projects vertically upward from the inclined portion 84, and also projects from the vertical portion 82 toward the drop path side of the raw material.

The movable portion 70 includes a rear surface portion 90, a bottom surface portion 92, and a side surface portion 94. As shown in FIG. 4, the rear surface portion 90 is formed in a plate shape that extends in the width direction and the vertical direction of the conveyor 20 at the receiving position. The rear surface portion 90 is arranged to face the vertical portion 82 of the fixing portion 72 with the raw material drop path sandwiched between the rear surface portion 90 at the receiving position. The length of the rear surface portion 90 in the width direction of the conveyor 20 is longer than the width of the region where the raw material exists on the conveyor 20. The vertical upper edge of the rear surface portion 90 is located vertically above the region where the raw material falling from the conveyor 20 exists at the receiving position.

The rear surface portion 90 is provided with a protruding portion 96 protruding from the rear surface portion 90. The protrusion 96 is provided on the side opposite to the conveyor 20 in the vicinity of the vertically upper edge of the rear surface portion 90.

The bottom surface portion 92 is formed in a plate shape and is continuous from the vertically lower edge of the rear surface portion 90. The bottom surface portion 92 is inclined so as to proceed vertically downward from the vertically lower edge of the rear surface portion 90 toward the fixed portion 72.

A protrusion 98 is provided on the upper surface side of the bottom surface portion 92. The protrusion 98 is located near the vertically lower edge. As described above, when the movable portion 70 is in the intermediate position, at least a part of the raw material collides with the bottom surface portion 92. A part of the raw material collided with the bottom surface portion 92 stays on the upper surface of the bottom surface portion 92 by the protrusion 98. Then, the raw material dropped from the conveyor 20 subsequently collides with the raw material on the bottom surface portion 92, and the bottom surface portion 92 is protected by the raw material on the bottom surface portion 92. That is, the protrusion 98 functions as an element of self-lining.

The tilt angle of the bottom surface portion 92 with respect to the horizontal plane at the retracted position is larger than the tilt angle of the bottom surface portion 92 with respect to the horizontal plane at the intermediate position. Therefore, when the movable portion 70 is moved to the retracted position, at least a part of the raw material deposited on the bottom surface portion 92 by the protrusion 98 at the intermediate position falls from the movable portion 70 and is placed on the bottom surface portion 92. Raw materials can be reduced.

The side surface portions 94 are provided at both ends of the conveyor 20 in the rear surface portion 90 and the bottom surface portion 92 in the width direction. The side surface portion 94 projects vertically upward from the bottom surface portion 92 at the receiving position, and also projects from the rear surface portion 90 toward the fixed portion 72.

The drive mechanism 74 includes a drive shaft 100, a drive arm portion 102, a drive connecting portion 104, a driven shaft support portion 106, a driven shaft 108, a driven arm portion 110, and a driven connecting portion 112. The drive shaft 100 is arranged on the side opposite to the conveyor 20 with respect to the movable portion 70 in the retracted position, and extends in the width direction of the conveyor 20. The drive shaft 100 is rotatably supported around the central axis of the drive shaft 100 by the side surface of the conveyor head cover 22.

One end of the drive arm portion 102 is connected to the drive shaft 100. The other end of the drive arm portion 102 is connected to the protruding portion 96 of the movable portion 70 via the drive connecting portion 104. The central axis of the drive connecting portion 104 extends in the width direction of the conveyor 20. The movable portion 70 can revolve around the central axis of the drive shaft 100 and can rotate around the central axis of the drive connecting portion 104.

The driven shaft support portion 106 extends from the rear portion 114 of the conveyor head cover 22 toward the conveyor 20 side. The driven shaft 108 is provided at the tip of the driven shaft support portion 106 and extends in the width direction of the conveyor 20. The driven shaft 108 is located at a position opposite to the conveyor 20 with respect to the drop path of the raw material, and is arranged at a position lower than the height position of the drive shaft 100. The driven shaft 108 is rotatably supported around the central axis of the driven shaft 108 by the driven shaft support portion 106.

One end of the driven arm portion 110 is connected to the driven shaft 108. The other end of the driven arm portion 110 is connected to the side surface portion 94 of the movable portion 70 via the driven connecting portion 112. The central axis of the driven connecting portion 112 extends in the width direction of the conveyor 20. The movable portion 70 can revolve around the central axis of the driven shaft 108 and can rotate around the central axis of the driven connecting portion 112.

The movable part drive device 28 is connected to the drive shaft 100 and rotates the drive shaft 100. The movable portion drive device 28 may be a hydraulic type or an electric type. Further, the movable unit drive device 28 has a movable unit position detection unit that detects the rotation angle (in other words, the rotation position) of the drive shaft 100.

It is assumed that the drive shaft is rotated in the direction in which the end of the drive arm portion 102 on the drive connecting portion 104 side is tilted downward. Then, in conjunction with the drive arm portion 102, the side end of the driven arm portion 110 on the side surface portion 94 is tilted downward with the driven shaft 108 as a fulcrum. As a result, the movable portion 70 moves in the direction approaching the fixed portion 72. The movable portion 70 is rotated in a direction in which the inclination of the bottom surface portion 92 with respect to the horizontal plane becomes smaller as the moving portion 70 approaches the fixed portion 72. Then, when the receiving position is reached, the fixed portion 72 and the movable portion 70 are combined to form a receiving container that opens vertically upward in the middle of the raw material drop path.

Further, it is assumed that the drive shaft 100 is rotated in a direction in which the end on the drive connecting portion 104 side of the drive arm portion 102 is lifted upward. Then, in conjunction with the drive arm portion 102, the side end of the driven arm portion 110 on the side surface portion 94 is lifted upward with the driven shaft 108 as a fulcrum. As a result, the receiving container is disassembled into a movable portion 70 and a fixed portion 72, and the movable portion 70 moves in a direction away from the fixed portion 72. The movable portion 70 is rotated in a direction in which the inclination of the bottom surface portion 92 with respect to the horizontal plane increases as the moving portion 70 moves away from the fixed portion 72.

The over-deposit prevention sensor 30 is arranged in the conveyor head cover 22. The over-deposition prevention sensor 30 is vertically above the movable portion 70 in which the receiving position is arranged, and is located outside the region where the raw material falling from the conveyor 20 exists. Depending on the state of the raw material charged from the conveyor 20, even if the movable portion 70 is arranged at an intermediate position, the raw material may be clogged in the gap between the movable portion 70 and the fixed portion 72. When the raw material is clogged, the raw material may be excessively deposited on the movable portion 70, and the input of the raw material from the conveyor 20 may be hindered. The over-deposit prevention sensor 30 detects when the raw material is excessively deposited on the movable portion 70.

When over-deposition is detected by the over-deposit prevention sensor 30, the movable portion 70 may be temporarily moved to the retracted position to increase the gap between the movable portion 70 and the fixed portion 72. Further, when the over-deposition is resolved, the movable portion 70 may be arranged at the intermediate position again.

The control unit 32 is a computer composed of a central processing unit, a ROM in which a program or the like is stored, a RAM as a work area, and a semiconductor integrated circuit. The control unit 32 functions by cooperating with the program.

When the raw material charging is instructed or the predetermined raw material charging timing is reached, the control unit 32 transmits a charging start command to each unit and starts a preparatory operation for accepting the raw material. Upon receiving the charging start command, the drive unit of the upper seal valve 42 opens the upper seal valve 42 of the furnace top bunker 10 to be received. Further, when the switching chute drive device 16 receives the charging start command, the switching chute 14 rotates the switching chute 14 so that the direction of the delivery port 54 is directed to the furnace top bunker 10 to be received. Upon receiving the closing start command, the movable unit drive device 28 rotates the drive shaft 100 so that the rotation angle of the drive shaft 100 is an angle corresponding to the intermediate position (intermediate position rotation angle). As a result, the movable portion 70 is moved to an intermediate position and held. Then, on the lower end side of the conveyor 20, loading of raw materials on the conveyor 20 is started.

The control unit 32 sequentially acquires the detection results of the raw material detection unit 24 after transmitting the charging start command. When the start end of the raw material is detected, the control unit 32 confirms whether or not the preparatory operation of each unit is completed at that timing. If the preparatory operation has already been completed when the starting point of the raw material is detected, the control unit 32 considers that it is normal and continuously controls each unit. On the other hand, if the preparatory operation is not completed when the start end of the raw material is detected, the control unit 32 stops the entire furnace top device 1.

When the raw material feeding is normally started in this way, the movable portion 70 is in the intermediate position. Therefore, as shown in FIG. 1, at least a part of the raw material falling from the raw material feeding side end of the conveyor 20 is the movable portion. It collides with the bottom surface portion 92 of 70. The raw material that collides with the bottom surface portion 92 moves downward along the bottom surface portion 92 and falls from the vertically lower edge of the bottom surface portion 92. Further, among the raw materials dropped from the conveyor 20, the raw materials that do not collide with the bottom surface portion 92 are combined with the raw materials that collide with the bottom surface portion 92 and fall from the bottom surface portion 92, and the falling direction is the falling direction of the raw materials falling from the bottom surface portion 92. It is changed to and falls.

Then, since the movable portion 70 is in the intermediate position, the raw material falling from the movable portion 70 passes through a predetermined region including the center of the inlet 52 of the entire inlet 52 of the switching chute 14, as shown in FIG. .. After that, the raw material falls on the rotation center of the switching chute 14 on the inner surface of the switching chute 14 and flows along the switching chute 14.

Here, FIGS. 6A, 6B, 7A and 7B are diagrams illustrating a comparative example furnace top device A in which the raw material input adjusting device 26 is not provided. In the fire top device A of the comparative example, three fire top bunker 10s are arranged in parallel, and the direction of the switching chute 14 is switched every 120 degrees according to the arrangement of the fire top bunker 10. FIG. 6A shows a cross-sectional view of the furnace top device A of the comparative example in the case where the horizontal direction of the switching chute 14 is the same as the horizontal direction of the conveyor 20. FIG. 6B shows a plan view of the furnace top device A of the comparative example in the case where the horizontal direction of the switching chute 14 is the same as the horizontal direction of the conveyor 20. Further, FIG. 7A shows a cross-sectional view of the furnace top device A of the comparative example in the case where the horizontal direction of the switching chute 14 is the direction rotated by 120 degrees with respect to the horizontal direction of the conveyor 20. FIG. 7B shows a plan view of the furnace top device A of the comparative example in the case where the horizontal direction of the switching chute 14 is the direction rotated by 120 degrees with respect to the horizontal direction of the conveyor 20.

In the case of FIGS. 6A and 6B, the raw material dropped from the raw material input side end of the conveyor 20 collides with the slope 66 in the conveyor head cover 22 and flows downward along the slope of the conveyor head cover 22. The raw material discharged from the conveyor head cover 22 passes near the peripheral edge of the receiving port 52 of the switching chute 14. Then, the raw material that has entered the switching chute 14 collides with the inner surface of the switching chute 14 and moves downward along the inner surface of the switching chute 14. At this time, the inclination direction of the slope 66 of the conveyor head cover 22 and the inclination direction of the inner surface of the switching chute 14 are opposite to each other. Therefore, as shown by the solid arrow B10 in FIG. 6B, the lateral (horizontal) speed when the raw material passes through the switching chute 14 is decelerated due to the influence of the reverse speed when passing through the slope 66. Will be done. As a result, the raw material falls relatively toward the radial core side in the furnace top bunker 10.

On the other hand, in the case of FIGS. 7A and 7B, the inclination direction of the slope 66 of the conveyor head cover 22 and the inclination direction of the inner surface of the switching chute 14 are not opposite to each other. Therefore, as shown by the solid arrow B12 in FIG. 7B, the lateral speed when the raw material passes through the switching chute 14 is increased by the influence of the speed when passing through the slope 66. As a result, the raw material falls relatively outward in the radial direction in the furnace top bunker 10.

Further, in the case of FIGS. 7A and 7B, due to the influence of the speed when passing through the slope 66, the raw material is displaced with respect to the rotation angle of the switching chute 14 in a direction approaching the conveyor 20 around the core, and the switching chute. It flows through 14. As a result, the raw material may fall to a position displaced around the core in the furnace top bunker 10.

In this way, when a plurality of furnace top bunker 10s are arranged in parallel, the raw material charging position may differ for each furnace top bunker 10 depending on the direction of the switching chute 14. As a result, the accuracy of control for charging the raw materials in the furnace top bunker 10 into the vertical furnace may decrease.

8A and 8B are diagrams illustrating the operation and effect of the furnace top device 1 of the present embodiment. FIG. 8A shows a case where the horizontal direction of the switching chute 14 is the same as the horizontal direction of the conveyor 20. FIG. 8B shows a case where the horizontal direction of the switching chute 14 is a direction rotated by 120 degrees with respect to the horizontal direction of the conveyor 20.

As shown in FIGS. 8A and 8B, in the furnace top device 1 of the present embodiment, the movable portion 70 is provided so as to be movable in the conveyor head cover 22, and the movable portion 70 is provided during charging of the raw material into the furnace top bunker 10. Is held in the middle position. As a result, in the furnace top device 1, the falling direction of the raw material is changed by the movable portion 70 before the raw material falling from the conveyor 20 reaches the slope 66 of the conveyor head cover 22. Therefore, in the furnace top device 1, the raw material can be dropped by a path passing through the center of the receiving port 52. That is, in the furnace top device 1 of the present embodiment, the raw material can be dropped at the position of the rotation center of the switching chute 14 on the inner surface of the switching chute 14.

Further, the vertically lower end of the movable portion 70 is located higher than the vertically lower end of the slope of the conveyor head cover 22. That is, in the furnace top device 1, the falling distance from the bottom surface portion 92 of the movable portion 70 to the inner surface of the switching chute 14 can be made longer than the falling distance from the slope 66 of the conveyor head cover 22 to the inner surface of the switching chute 14. .. As a result, in the furnace top device 1, by dropping the raw material from the movable portion 70, the lateral velocity component can be sufficiently consumed in the middle of the falling path, and the raw material is used in a state where the lateral velocity component is small. It is possible to reach the inner surface of the switching chute 14. That is, in the furnace top device 1 of the present embodiment, the raw material does not collide with the inner surface of the switching chute 14 from the direction inclined with respect to the vertical direction, but collides with the inner surface of the switching chute 14 in the vertical downward direction. Can be made to.

From these, as shown in FIGS. 8A and 8B, in the furnace top device 1, the drop position of the raw material on the switching chute 14 is constant at the position of the rotation center of the switching chute 14 regardless of the direction of the switching chute 14. Will be done. Further, in the furnace top device 1, since the influence of the lateral speed component of the raw material before colliding with the switching chute 14 is suppressed, the magnitude of the speed of the raw material passing through the switching chute 14 is determined by the direction of the switching chute 14. It can be almost the same regardless of.

Therefore, according to the furnace top device 1 of the present embodiment, the raw material can be accurately charged to a desired position in the furnace top bunker 10 regardless of the direction of the switching chute 14.

Further, in the vicinity of the end of the raw material transported by the conveyor 20, the load of the raw material may collapse during transportation by the conveyor 20, and the raw material may be scattered on the conveyor 20. The weight of the scattered raw material is smaller than that of the raw material normally placed on the conveyor 20, and there is a high possibility that the weight of the scattered raw material will be less than a predetermined threshold value in the raw material detection unit 24. Then, the raw material detection unit 24 considers the position where the weight is less than the predetermined threshold value as the end of the raw material before reaching the actual end including the scattered raw material. That is, the scattered portion of the raw material leaks from the detection of the end by the raw material detecting unit 24. Hereinafter, the remaining raw material leaked from the detection of the terminal, in other words, the raw material after the detected terminal may be referred to as residual ore.

If there is residual ore after the end of the raw material is detected, this residual ore may be input from the conveyor 20 and reach the upper seal valve 42 of the furnace top bunker 10. The upper seal valve 42 is closed in response to the detection of the end of the raw material as described above. Then, the residual ore may be sandwiched between the valve seat 44 of the upper seal valve 42 and the valve body 46, and the airtightness of the furnace top bunker 10 may decrease. As a result, the pressure in the furnace top bunker 10 decreases with respect to the pressure in the vertical furnace, which may affect the operation of the vertical furnace.

Therefore, in the furnace top device 1 of the present embodiment, the residual ore is treated as follows. When the end of the raw material is detected during the feeding of the raw material, the control unit 32 transmits a retracted position command for moving the movable unit 70 to the retracted position to the movable unit driving device 28. Upon receiving the retracted position command, the movable unit drive device 28 rotates the drive shaft 100 so that the rotation angle of the drive shaft 100 becomes an angle corresponding to the retracted position (retracted position rotation angle). As a result, the movable portion 70 moves to the retracted position.

Then, the raw material remaining on the bottom surface portion 92 of the movable portion 70 falls according to the evacuation of the movable portion 70. At the retracted position, the inclination angle of the bottom surface portion 92 is larger than that at the intermediate position, so that more raw materials can be dropped on the bottom surface portion 92. The raw material dropped at this time passes through the discharge port 62, the switching chute 14, and the raw material input port 40, and is charged into the furnace top bunker 10. Further, by moving the movable portion 70 to the evacuation position, it becomes possible to receive a larger amount of residual ore when the movable portion 70 is subsequently moved to the receiving position.

When a predetermined time elapses after the movable unit 70 reaches the retracted position, the control unit 32 transmits a receiving position command for moving the movable unit 70 to the receiving position to the movable unit driving device 28. The predetermined time here corresponds to the time for the movable portion 70 to stay in the retracted position. The predetermined time is set to a time during which the raw material on the bottom surface portion 92 can be sufficiently dropped, and is movable until the end of the raw material moves from the raw material detection unit 24 to the raw material input side end of the conveyor 20. The time at which the unit 70 can reach the receiving position via the retracting position is set. Upon receiving the acceptance position command, the movable portion drive device 28 rotates the drive shaft 100 so that the rotation angle of the drive shaft 100 becomes an angle corresponding to the acceptance position (reception position rotation angle). As a result, the movable portion 70 moves to the receiving position.

When the movable portion 70 reaches the receiving position, the fixed portion 72 and the movable portion 70 are combined to form a receiving container in the middle of the raw material drop path. The residual ore leaked from the detection of the end of the raw material is captured and held in this receiving container before reaching the discharge port 62. After the receiving container is formed, the control unit 32 causes the drive unit of the upper seal valve 42 to close the upper seal valve 42.

In the furnace top device 1, even if the upper seal valve 42 is closed, it is possible to prevent the residual ore from being caught between the valve seat 44 of the upper seal valve 42 and the valve body 46. As a result, the fire top device 1 can prevent the airtightness of the fire top bunker 10 from being lowered.

Further, as described above with reference to FIG. 7B, in the furnace top device A of the comparative example, the charging position of the raw material in the furnace top bunker 10 may be displaced around the core depending on the direction of the switching chute 14. On the other hand, in the furnace top device 1 of the present embodiment, the lateral velocity component when the raw material reaches the inner surface of the switching chute 14 can be reduced, and the core regarding the charging position of the raw material in the furnace top bunker 10 can be reduced. It is possible to suppress the displacement around.

However, there may be cases where you want to further improve the accuracy of the raw material input position in the furnace top bunker 10. Therefore, in the furnace top device 1 of the present embodiment, the rotation angle of the switching chute 14 may be set as follows.

9A and 9B are schematic plan views illustrating the setting of the rotation angle of the switching chute 14. The furnace top bunker 10A is located approximately directly below the movable portion 70 in a plan view. The furnace top bunker 10B is arranged so as to be displaced by 120 degrees from the furnace top bunker 10A in the clockwise direction around the core in a plan view. The furnace top bunker 10C is arranged so as to be displaced by 120 degrees from the furnace top bunker 10A in the counterclockwise direction around the core in a plan view. FIG. 9A shows a case where the switching chute 14 is directed to the furnace top bunker 10B. FIG. 9B shows a case where the switching chute 14 is directed toward the furnace top bunker 10C. In FIGS. 9A and 9B, the alternate long and short dash line 120B indicates a reference angle based on the arrangement of the top bunker 10B. The alternate long and short dash line 120C indicates a reference angle based on the arrangement of the furnace top bunker 10C.

When the raw material is charged into the furnace top bunker 10B, the raw material is on the furnace top bunker 10C side (conveyor 20 side) around the core with respect to the reference angle (dotted chain line 120B) of the furnace top bunker 10B while passing through the switching chute 14. ) Tends to flow.

Therefore, when the raw material is charged into the furnace top bunker 10B, as shown by the alternate long and short dash line 122B in FIG. 9A, the rotation angle of the switching chute 14 is the movable portion 70 around the core with respect to the reference angle of the furnace top bunker 10B. The rotation angle is set to be corrected in the direction toward. As a result, as shown by the solid arrow 124B, the raw material passing through the switching chute 14 can flow in the direction along the reference angle of the furnace top bunker 10B. As a result, the raw material can be charged into the desired position of the furnace top bunker 10B, and the accuracy of the charging position of the raw material in the furnace top bunker 10B can be further improved.

When the raw material is charged into the furnace top bunker 10C, the raw material is on the furnace top bunker 10B side (conveyor) around the core with respect to the reference angle (dotted chain line 120C) of the furnace top bunker 10C while passing through the switching chute 14. 20 side) tends to flow.

Therefore, when the raw material is charged into the furnace top bunker 10C, as shown by the alternate long and short dash line 122C in FIG. 9B, the rotation angle of the switching chute 14 is the movable portion 70 around the core with respect to the reference angle of the furnace top bunker 10C. The rotation angle is set to be corrected in the direction toward. As a result, as shown by the solid arrow 124C, the raw material passing through the switching chute 14 can be flowed in the direction along the reference angle of the furnace top bunker 10C. As a result, the raw material can be charged into the desired position of the furnace top bunker 10C, and the accuracy of the charging position of the raw material in the furnace top bunker 10C can be further improved.

When switching the furnace top bunker 10 to be received, the control unit 32 rotates the switching chute 14 on the switching chute driving device 16 so that the rotation angle of the switching chute 14 becomes the rotation angle set above. The correction amount of the rotation angle of the switching chute 14 may be determined in advance by, for example, performing a trial run for confirming the relationship between the rotation angle of the switching chute 14 and the feeding position of the raw material.

Although one embodiment has been described above with reference to the attached drawings, it goes without saying that the present disclosure is not limited to the above embodiment. It is clear that a person skilled in the art can come up with various modifications or modifications within the scope of the claims, and it is understood that these also naturally belong to the technical scope of the present disclosure. Will be done.

1:

Top device

10, 10A, 10B, 10C: Top bunker 14: Switching chute 20: Conveyor 22: Conveyor head cover 24: Raw material detection unit 32: Control unit 52: Inlet 62: Discharge port 70: Moving part 72: Fixed part 92: Bottom part

Claims

A conveyor head cover that surrounds the end of the conveyor on the raw material input side,
A switching chute that has an inlet facing the discharge port of the conveyor head cover and can rotate around the central axis of the inlet.
A plurality of furnace top bunkers arranged in parallel around the core on the vertically lower side of the switching chute, and
Movable parts provided in the conveyor head cover and
Equipped with
The movable portion is a furnace top device that can be arranged at an intermediate position where at least a part of the raw material falling from the conveyor collides.
The movable part can be moved to a retracted position outside the area where the raw material falling from the conveyor exists.
The furnace top device according to claim 1, wherein the inclination angle of the bottom surface portion of the movable portion at the retracted position with respect to the horizontal plane is larger than the inclination angle of the bottom surface portion of the movable portion with respect to the horizontal plane at the intermediate position.
Further, a fixing portion is further provided, which is fixedly arranged on the side opposite to the retracted position with respect to the area where the raw material falling from the conveyor exists.
The furnace top device according to claim 2, wherein the movable portion can be moved to a receiving position forming a receiving container together with the fixed portion.
A raw material detection unit that detects the end of the raw material input from the conveyor,
While the raw material is being charged, the movable portion is held in the intermediate position, and the movable portion is moved from the intermediate position to the retracted position in response to the detection of the end of the raw material by the raw material detecting unit, and then the receiving position. With the control unit to move to
The furnace top device according to claim 3, further comprising.
One of claims 1 to 4, wherein the rotation angle of the switching chute is set to a rotation angle corrected in a direction toward the movable portion around the core with respect to a reference angle based on the arrangement of the furnace top bunker. The furnace top device described in.