Furnace top device

Abstract

To prevent the reduction in the air tightness of a furnace top bunker while suppressing the machine height.SOLUTION: A furnace top device 1 comprises: a conveyor head cover 20 for surrounding a raw material input side end of a conveyor 18; and a movable part 62 provided at the inside of the conveyor head cover 20, in which raw material is mutually movable between a retreat position so as to pass through an exhaust port 52 of the conveyor head cover 20 and a blockage position in the middle of a drop route of the raw material. In this way, the reduction in the airtightness of a furnace top bunker 10 can be prevented while suppressing the machine height of the furnace top device 1.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present disclosure relates to a furnace top apparatus. [Background technology]

[0002] In the furnace top equipment of a vertical furnace, after the pressure in the furnace top bunker is equalized to the pressure in the vertical furnace, raw materials are charged from the furnace top bunker to the vertical furnace. For example, Patent Document 1 discloses an upper seal valve that seals the raw material charging port at the top of the furnace top bunker. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Registration No. 3000164 Summary of the Invention [Problem to be solved by the invention]

[0004] The top seal valve of the top bunker is closed in response to the detection of the end of the raw materials fed from the conveyor to the top bunker. However, after the end of the raw materials is detected, residual ore, which is the remaining raw materials that have escaped the detection, may be fed from the conveyor. If this happens, the residual ore may get caught between the valve seat and the valve body of the top seal valve of the top bunker, which may reduce the airtightness of the top bunker.

[0005] Therefore, it is possible to provide a funnel-shaped hopper and a receiving gate that opens and closes the bottom end of the hopper between the conveyor head cover and the switching chute. In this embodiment, the receiving gate is closed when the end of the raw material is detected, so that the residual ore can be captured by the receiving gate and it is possible to prevent the residual ore from being pinched by the upper seal valve. However, in this embodiment, the height of the furnace top device becomes high, and the entire facility becomes large.

[0006] The present disclosure aims to provide a furnace top device that can prevent a decrease in airtightness of a furnace top bunker while suppressing the machine height. [Means for solving the problem]

[0007] In order to solve the above problems, a furnace top device according to one embodiment of the present disclosure includes a conveyor head cover that surrounds the raw material input end of the conveyor, a movable part that is provided within the conveyor head cover and is movable between a retracted position where the raw material can pass through the discharge port of the conveyor head cover and a blocking position midway along the falling path of the raw material, A fixing part including at least a first fixing plate fixed and arranged on the opposite side of the withdrawal position with respect to the falling path of the raw material; Equipped with The movable part forms a receiving container together with the fixed part in the blocking position. .

[0008] The furnace top device may further include a raw material detection unit that detects the end of the raw materials fed from the conveyor, and a control unit that moves the movable part from the retracted position to the blocking position in response to detection of the end of the raw materials by the raw material detection unit.

[0009] The movable portion may be movable between the retracted position and the blocking position by swinging about a first rotation shaft extending in the width direction of the conveyor.

[0011] In order to solve the above problems, a furnace top device according to one embodiment of the present disclosure includes a conveyor head cover that surrounds the raw material input end of the conveyor, a movable part that is provided within the conveyor head cover and is movable between a retracted position where the raw material can pass through the discharge port of the conveyor head cover and a blocking position midway along the falling path of the raw material, A fixing section including at least a first fixing plate fixed on the opposite side of the fall path of the raw material from the retreat position. And, The movable part has a bottom surface portion that is inclined with respect to a horizontal plane, and is capable of moving between a retracted position and a blocking position by sliding the bottom surface portion in the inclined direction, and forms a receiving container together with the fixed part at the blocking position. do.

[0012] In order to solve the above problems, a furnace top device according to one embodiment of the present disclosure includes a conveyor head cover that surrounds the raw material input end of the conveyor, a movable part that is provided within the conveyor head cover and is movable between a retracted position where the raw material can pass through the discharge port of the conveyor head cover and a blocking position midway along the falling path of the raw material, A movable container that is located at the tip of the vertically lower end of the movable part in the blocking position and is capable of changing the opening direction of the opening around a second rotation axis extending in the width direction of the conveyor. And, Preparation do.

[0013] In addition, the furnace top device may further include a control unit that opens the movable container vertically above the horizontal when the movable part is in the shut-off position, and opens the movable container vertically below the horizontal when the movable part is in the retracted position. Effect of the Invention

[0014] According to the present disclosure, it is possible to prevent a decrease in airtightness of the top bunker while suppressing the machine height. [Brief description of the drawings]

[0015] [Figure 1] FIG. 1 is a schematic cross-sectional view showing the configuration of a furnace top device according to a first embodiment. [Diagram 2] FIG. 2 is a schematic perspective side view of a conveyor head cover as viewed from the conveyor side when the movable part is in the retracted position. [Diagram 3] FIG. 3 is a schematic perspective plan view of the conveyor head cover as viewed from vertically above when the movable portion is in the retracted position. [Figure 4] FIG. 4 is a schematic cross-sectional view showing the configuration of the furnace top device when the movable part is in the blocking position. [Diagram 5] FIG. 5 is a schematic perspective side view of the conveyor head cover as viewed from the conveyor side when the movable portion is in the blocking position. [Figure 6] FIG. 6 is a schematic perspective plan view of the conveyor head cover as viewed from vertically above when the movable portion is in the blocking position. [Figure 7] FIG. 7 is a schematic cross-sectional view showing the configuration of a furnace top device of a comparative example. [Figure 8] FIG. 8 is a schematic cross-sectional view showing the configuration of a furnace top device according to a modified example of the first embodiment. [Figure 9] FIG. 9 is a schematic cross-sectional view when the movable portion is in the blocking position. [Figure 10] FIG. 10 is a schematic cross-sectional view showing the configuration of a furnace top device according to the second embodiment. [Figure 11] FIG. 11 is a schematic cross-sectional view showing the movable plate in the blocking position. [Figure 12] FIG. 12 is a schematic cross-sectional view showing the configuration of a furnace top device according to the third embodiment. [Figure 13] FIG. 13 is a schematic cross-sectional view when the movable portion is in the blocking position. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] An embodiment of the present disclosure will be described in detail below with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values ​​shown in the embodiment are merely examples for ease of understanding, and do not limit the present disclosure unless otherwise specified. In this specification and drawings, elements having substantially the same functions and configurations are given the same reference numerals to avoid repeated explanations, and elements not directly related to the present disclosure are not illustrated.

[0017] (First embodiment) 1 is a schematic cross-sectional view showing the configuration of a furnace top device 1 according to the first embodiment. The furnace top device 1 is provided vertically above the shaft furnace to feed raw materials into the shaft furnace. The shaft furnace is, for example, a blast furnace that produces iron from raw materials such as iron ore and coke, but may be any furnace.

[0018] The furnace top equipment 1 includes a furnace top bunker 10, a receiving hopper 12, a switching chute 14, a conveyor head pulley 16, a conveyor 18, a conveyor head cover 20, a raw material detection unit 22, a residual ore treatment unit 24, a drive unit 26 and a residual ore control unit 28.

[0019] The top bunker 10 is a hollow container. For example, a plurality of top bunkers 10 (for example, three) are arranged vertically above the vertical furnace. FIG. 1 illustrates one of the plurality of top bunkers 10. The top bunker 10 is arranged eccentrically with respect to the core of the vertical furnace. The top bunkers 10 are arranged in parallel at equal intervals around the core. For example, when the number of top bunkers 10 is three, the top bunkers 10 are arranged in parallel at 120 degree intervals around the core. The number of top bunkers 10 is not limited to three, and may be two or four.

[0020] A raw material inlet 30 is formed at the top of the top bunker 10, which connects the inside and outside of the top bunker 10. As described later, raw materials are charged into the top bunker 10 through the raw material inlet 30. The top bunker 10 can store the charged raw materials.

[0021] An upper seal valve 32 is provided at the raw material inlet 30 of the top bunker 10. The upper seal valve 32 includes a valve seat 34 formed at the end of the raw material inlet 30 and a valve body 36 that opens and closes with respect to the valve seat 34. The upper seal valve 32 opens and closes the raw material inlet 30, and seals the raw material inlet 30 between the valve seat 34 and the valve body 36 when the raw material inlet 30 is closed.

[0022] Although not shown, a raw material discharge port is formed at the bottom of the top bunker 10 to connect the inside and outside of the top bunker 10. In addition, a flow adjustment gate and a lower seal valve are provided at the raw material discharge port of the top bunker 10. The flow adjustment gate blocks the discharge of raw materials by closing the raw material discharge port. The lower seal valve blocks the flow of gas. When the flow adjustment gate and the lower seal valve are opened at a predetermined timing, the raw materials in the top bunker 10 are charged into the vertical furnace through the raw material discharge port.

[0023] The receiving hopper 12 is disposed vertically above the top bunker 10. The receiving hopper 12 is formed hollow and disposed so that its central axis roughly overlaps with the furnace core. Note that a portion of the receiving hopper 12 is omitted in FIG. 1. The lower portion of the receiving hopper 12 is provided with lower openings 40 equal to the number of the top bunkers 10. The lower openings 40 each open toward the raw material inlet 30 of the top bunker 10.

[0024] The switching chute 14 is disposed at the upper part inside the receiving hopper 12. The switching chute 14 is formed in a curved cylindrical shape that communicates with the inside and outside of the receiving hopper 12. At one end of the switching chute 14, a receiving port 42 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 44 that opens toward the lower opening 40 is formed.

[0025] The switching chute 14 is rotatable about the central axis of the receiving hopper 12 which passes through the center of the receiving port 42. In other words, the switching chute 14 can switch the direction of the delivery port 44, and can select the lower opening 40 facing the delivery port 44. The switching chute 14 is not limited to a rotary type, and may be a so-called damper type or swing type.

[0026] The conveyor head pulley 16 is disposed approximately vertically above the receiving hopper 12. Specifically, the conveyor head pulley 16 is positioned obliquely above and radially displaced from the central axis of the receiving hopper 12. The conveyor 18 is connected to the conveyor head pulley 16. The conveyor 18 extends from the conveyor head pulley 16 in a direction away from the reactor core. The conveyor 18 is inclined with respect to the horizontal plane so as to move vertically downward as it moves away from the conveyor head pulley 16.

[0027] A predetermined amount of raw materials is placed on the conveyor 18 at the lower end of the incline of the conveyor 18. The conveyor 18 transports the raw materials placed on the conveyor 18 to the conveyor head pulley 16 side, which is the upper end of the incline. At this time, the predetermined amount of raw materials is transported in a continuous manner in the longitudinal direction of the conveyor as a batch. The raw materials transported to the conveyor head pulley 16 side are fed from the conveyor 18. The two-dot chain line in FIG. 1 shows an example of the range in which the raw materials exist. Hereinafter, the end of the conveyor 18 on the conveyor head pulley 16 side may be referred to as the raw material feeding end.

[0028] The conveyor head cover 20 is located vertically above the top bunker 10, specifically, vertically above the switching chute 14. The conveyor head cover 20 is a hollow container, and is provided so as to surround the raw material input end of the conveyor 18. The conveyor head cover 20 has an opening 50 in a part of its side that connects the inside and outside of the conveyor head cover 20. A part of the conveyor head pulley 16 and the raw material input end of the conveyor 18 are inserted into the conveyor head cover 20 through the opening 50 of the conveyor head cover 20.

[0029] A discharge port 52 that communicates between the inside and outside of the conveyor head cover 20 is formed at the bottom of the conveyor head cover 20. The discharge port 52 is formed in a circular shape and faces the receiving port 42 of the switching chute 14. The conveyor head cover 20 is constricted so that the internal shape gradually transitions from a square to a circle as it progresses from the top surface 54 side of the conveyor head cover 20 toward the discharge port 52 side, and the internal space gradually becomes narrower.

[0030] The raw material detection unit 22 is provided near the conveyor head pulley 16 on the conveyor 18. The raw material detection unit 22 detects the presence or absence of raw materials being fed from the conveyor 18 based on the weight of the raw materials on the conveyor 18 at the location where the raw material detection unit 22 is installed. Specifically, the raw material detection unit 22 is provided at a location where it is expected that raw materials will be fed from the conveyor 18 a predetermined time after detection. The predetermined time is set to, for example, 10 seconds, but may be set arbitrarily taking into account the transport speed of the conveyor 18.

[0031] When the weight is equal to or greater than the predetermined threshold, the raw material detection unit 22 detects that raw materials are present on the conveyor 18. When the weight is less than the predetermined threshold, the raw material detection unit 22 detects that raw materials are not present on the conveyor 18. For this reason, the raw material detection unit 22 detects the end of the raw materials fed from the conveyor 18 when the weight changes from a state in which the weight is equal to or greater than the predetermined threshold to a state in which the weight is less than the predetermined threshold. The end of the raw materials indicates the side of the raw materials that are fed latest among the raw materials in a series of batches. Also, the raw material detection unit 22 detects the beginning of the raw materials fed from the conveyor 18 when the weight changes from a state in which the weight is less than the predetermined threshold to a state in which the weight is equal to or greater than the predetermined threshold. The beginning of the raw materials indicates the side of the raw materials in a series of batches that are fed earliest.

[0032] During normal raw material charging, the raw material is transported by the conveyor 18, so the weight of the raw material at the raw material detection unit 22 is equal to or greater than a predetermined threshold value. The raw material transported by the conveyor 18 is introduced into the conveyor head cover 20 and charged from the conveyor 18. Then, as shown by the two-dot chain arrow in FIG. 1, the raw material is charged into the top bunker 10 through the conveyor 18, the conveyor head cover 20, the switching chute 14, the receiving hopper 12, and the raw material charging port 30 in that order.

[0033] When the end of the raw material is detected by the raw material detection unit 22, the upper seal valve 32 is closed after a predetermined time. The predetermined time is appropriately set in consideration of the time it takes for the raw material to move from the detection position of the raw material detection unit 22 to the top bunker 10. The top bunker 10 is sealed by closing the upper seal valve 32 with the lower seal valve closed. The top bunker 10 is then pressurized so that the pressure in the top bunker 10 is equal to the pressure in the vertical furnace. By equalizing the pressure in the top bunker 10 to the pressure in the vertical furnace, the raw materials in the top bunker 10 can be appropriately charged into the vertical furnace later.

[0034] Here, near the end of the raw materials, the raw materials may collapse during transportation on the conveyor 18, causing the raw materials to scatter on the conveyor 18. The weight of the scattered raw materials is smaller than that of raw materials normally placed on the conveyor 18, and there is a high possibility that the weight will be less than the predetermined threshold value in the raw material detection unit 22. In this case, the raw material detection unit 22 will regard the position where the weight becomes less than the predetermined threshold value as the end of the raw materials before it reaches the actual end including the scattered raw materials. In other words, the scattered part of the raw materials will not be detected by the raw material detection unit 22. Hereinafter, the remainder of the raw materials that has not been detected at the end, in other words, the raw materials after the detected end, may be referred to as residual ore.

[0035] If there is residual ore after the end of the raw materials is detected, the residual ore may be fed from the conveyor 18 to the upper seal valve 32 of the top bunker 10. The upper seal valve 32 is closed in response to the detection of the end of the raw materials as described above. If this happens, the residual ore may be caught between the valve seat 34 and the valve body 36 of the upper seal valve 32, which may reduce the airtightness of the top bunker 10. As a result, the pressure in the top bunker 10 may be reduced relative to the pressure in the vertical furnace, which may affect the operation of the vertical furnace.

[0036] Therefore, the furnace top device 1 according to the first embodiment includes a residual ore processing device 24, a drive device 26, and a residual ore control device 28. The residual ore processing device 24 is provided inside the conveyor head cover 20. In other words, the residual ore processing device 24 is located vertically above the discharge port 52 of the conveyor head cover 20.

[0037] The residual ore processing unit 24 has a fixed part 60, a movable part 62, and a drive mechanism 64. The movable part 62 is movable between a retracted position and a blocking position, as will be described later. The retracted position indicates a position where the raw material can pass through the discharge port 52 of the conveyor head cover 20. For example, the retracted position is set on the opposite side of the conveyor 18 with respect to the fall path of the raw material falling from the raw material input end of the conveyor 18. The blocking position indicates a position in the middle of the fall path of the raw material falling from the raw material input end of the conveyor 18. For example, the blocking position is set so as to prevent the normal fall of the raw material in the middle of the fall path. FIG. 1 shows a case where the movable part 62 is in the retracted position.

[0038] FIG. 2 is a schematic perspective side view of the conveyor head cover 20 seen from the conveyor 18 side when the movable part 62 is in the retracted position. FIG. 3 is a schematic perspective plan view of the conveyor head cover 20 seen from vertically above when the movable part 62 is in the retracted position. FIG. 4 is a schematic cross-sectional view showing the configuration of the furnace top device 1 when the movable part 62 is in the blocking position. FIG. 5 is a schematic perspective side view of the conveyor head cover 20 seen from the conveyor 18 side when the movable part 62 is in the blocking position. FIG. 6 is a schematic perspective plan view of the conveyor head cover 20 seen from vertically above when the movable part 62 is in the blocking position. The residual ore processing unit 24 will be described in detail below with reference to FIGS. 1 to 6.

[0039] The fixing portion 60 of the residual ore processing section 24 includes a first fixing plate 70 and a second fixing plate 72. The first fixing plate 70 is formed in a plate shape that expands in the width direction and vertical direction of the conveyor 18. The first fixing plate 70 becomes wider in the width direction of the conveyor 18 as it moves from the vertical lower edge to the vertical upper edge. The length of the first fixing plate 70 in the width direction of the conveyor 18 is longer than the width of the area where the raw materials exist on the conveyor 18 at the vertical upper edge of the first fixing plate 70. The length of the first fixing plate 70 in the vertical direction is determined based on the residual ore capacity, which indicates the amount of residual ore to be processed.

[0040] The first fixed plate 70 is connected to a first support portion 74 extending in the width direction of the conveyor 18. The first support portion 74 is connected to a side surface of the conveyor head cover 20 and supports the first fixed plate 70. The first fixed plate 70 is fixedly disposed on the conveyor 18 side with respect to the path through which the raw materials fall from the conveyor 18. In other words, since the retracted position is set on the opposite side of the conveyor 18 with respect to the path through which the raw materials fall, the first fixed plate 70 is fixedly disposed on the opposite side of the retracted position with respect to the path through which the raw materials fall.

[0041] The second fixed plate 72 is formed in a plate shape that expands in the width direction and vertical direction of the conveyor 18. The second fixed plate 72 becomes wider in the width direction of the conveyor 18 as it moves from the vertical lower edge to the vertical upper edge. The length of the second fixed plate 72 in the width direction of the conveyor 18 is longer at the vertical upper edge of the second fixed plate 72 than the width of the area on the conveyor 18 where the raw materials are present.

[0042] The second fixed plate 72 is connected to a second support portion 76 extending in the vertical direction. The second support portion 76 is connected to the top surface 54 of the conveyor head cover 20 and supports the second fixed plate 72. The second fixed plate 72 is fixedly arranged on the opposite side of the conveyor 18 with respect to the path through which the raw materials fall from the conveyor 18. In other words, since the retracted position is set on the opposite side of the conveyor 18 with respect to the path through which the raw materials fall, the second fixed plate 72 is fixedly arranged on the retracted position side with respect to the path through which the raw materials fall. The second fixed plate 72 is arranged opposite the first fixed plate 70 with a gap therebetween.

[0043] The edge of the second fixed plate 72 on the vertical upper side is located vertically above the area where the raw materials are present when they fall from the conveyor 18. The second fixed plate 72 may be arranged so that a part of the falling raw materials collides with the surface on the conveyor 18 side. Although not shown, the surface of the second fixed plate 72 may be self-lined. For example, a steel material extending in the width direction of the conveyor 18 may be provided on the surface of the second fixed plate 72 so as to protrude from the surface of the second fixed plate 72. The raw materials are accumulated on the surface of the second fixed plate 72 by this steel material. Since the surface of the second fixed plate 72 is protected by the accumulated raw materials, it is possible to reduce collision wear caused by raw materials that collide with it later.

[0044] The movable portion 62 includes a rotating shaft 80, a bottom surface portion 82, a side surface portion 84, an auxiliary plate portion 86, and a connecting portion 88. The rotating shafts 80 are provided on both side surfaces of the conveyor head cover 20 in the width direction of the conveyor 18. The central axes of both rotating shafts 80 are positioned on the same straight line extending in the width direction of the conveyor 18. The rotating shafts 80 are supported rotatably around their central axes.

[0045] The bottom surface portion 82 is formed in a curved plate shape so that the center of curvature is the central axis of the rotating shaft 80. The length of the bottom surface portion 82 in the width direction of the conveyor 18 is approximately equal to the length of the vertical lower edge of the first fixed plate 70 and the length of the vertical lower edge of the second fixed plate 72.

[0046] The side portions 84 are connected to each edge of the bottom portion 82 in the width direction of the conveyor 18. The side portions 84 are formed in a plate shape extending from the bottom portion 82 in a direction generally toward the rotation shaft 80. The side portions 84 are inclined so that the distance between the side portions 84 increases as they move away from the bottom portion 82. The side portions 84 are formed from one edge to the other edge in the curved direction of the bottom portion 82.

[0047] The auxiliary plate portions 86 are provided on each of the side surface portions 84, and are connected to the side surface portion 84 and the bottom surface portion 82. The auxiliary plate portions 86 are located on the edge of the side surface portion 84 on the top surface 54 side in the curved direction of the bottom surface portion 82. The auxiliary plate portions 86 protrude from the side surface portion 84 to which they are connected in a direction toward the opposite side surface portion 84. There is a gap between the two auxiliary plate portions 86.

[0048] The connecting portion 88 connects the side portion 84 and the rotation shaft 80. Therefore, the movable portion 62 is capable of swinging around the rotation shaft 80. In other words, the movable portion 62 is capable of moving between the retracted position and the blocking position by swinging around the rotation shaft 80.

[0049] 1 to 3, when the movable part 62 is in the retracted position, the bottom part 82 is located on the opposite side of the conveyor 18 with respect to the second fixed plate 72. As a result, when the movable part 62 is in the retracted position, the raw material input from the conveyor 18 can pass between the first fixed plate 70 and the second fixed plate 72, and as a result, can pass through the discharge port 52.

[0050] In addition, the side surface portion 84 is retracted to the retracted position together with the bottom surface portion 82. Therefore, in the furnace top device 1, clogging of the fixing portion 60 with raw materials when the raw materials are charged can be prevented, compared to an embodiment in which the side surface portion 84 is fixed to the blocking position as the fixing portion 60.

[0051] When the movable portion 62 is in the blocking position, as shown in Figs. 4 to 6, the vertically lower edge of the first fixed plate 70 and the vertically lower edge of the second fixed plate 72 are combined with the bottom surface portion 82. That is, the bottom surface portion 82 is disposed from the vertically lower edge of the first fixed plate 70 to the vertically lower edge of the second fixed plate 72. In this case, the edge of the conveyor 18 in the width direction of the first fixed plate 70 is combined with the side surface portion 84. In this case, the edge of the conveyor in the width direction of the second fixed plate 72 is combined with the auxiliary plate portion 86, and as a result, is combined with the side surface portion 84 via the auxiliary plate portion 86.

[0052] That is, the movable part 62, in the blocking position, forms a receiving container together with the first fixed plate 70 and the second fixed plate 72. This receiving container is open only vertically upward. Thus, when the movable part 62 is in the blocking position, the raw material input from the conveyor 18 is contained in the receiving container formed by the movable part 62 and the fixed part 60, and as a result, does not reach the discharge port 52.

[0053] The drive mechanism 64 includes a drive shaft 90, a first arm 92a, a second arm 92b, a third arm 92c, a first connecting portion 94a, and a second connecting portion 94b.

[0054] The drive shaft 90 is disposed on the opposite side of the conveyor 18 with respect to the movable part 62 in the retracted position. The drive shaft 90 is supported on a side surface of the conveyor head cover 20 and is rotatable around a central axis extending in the width direction of the conveyor 18.

[0055] One end of the first arm 92a is connected to the drive shaft 90. The other end of the first arm 92a is rotatably connected to one end of the second arm 92b via a first connecting portion 94a. The other end of the second arm 92b is rotatably connected to one end of the third arm 92c via a second connecting portion 94b. The other end of the third arm 92c is connected to the bottom surface portion 82.

[0056] The drive unit 26 is coupled to the drive shaft 90 and rotates the drive shaft 90. The drive unit 26 may be hydraulic or electric.

[0057] As shown in Figs. 1 to 3, in a state where the end of the first arm 92a on the side of the first connecting portion 94a is lifted vertically upward, the movable portion 62 is held in the retracted position. From this state, when the drive shaft 90 is rotated so that the end of the first arm 92a on the side of the first connecting portion 94a is lowered vertically downward as shown in Figs. 4 to 6, the movable portion 62 swings around the rotation shaft 80 and moves to the blocking position. Thereafter, when the drive shaft 90 is rotated so that the end of the first arm 92a on the side of the first connecting portion 94a is lifted vertically upward, the movable portion 62 swings around the rotation shaft 80 and moves again to the retracted position. In this way, the movable portion 62 swings around the rotation shaft 80 in accordance with the rotation of the drive shaft 90, and is held at a position according to the rotation angle of the drive shaft 90.

[0058] A stopper 96 may be provided on the inner surface of the conveyor head cover 20. The stopper 96 protrudes near the end of the first arm 92a on the first connecting portion 94a side when the movable portion 62 is in the retracted position. When the first arm 92a is raised beyond an angle corresponding to the retracted position, the stopper 96 comes into contact with the first arm 92a to restrict excessive lifting of the first arm 92a.

[0059] The residual ore control unit 28 is a computer composed of semiconductor integrated circuits including a central processing unit, a ROM in which programs and the like are stored, and a RAM as a work area. The residual ore control unit 28 functions by working with the program. The residual ore control unit 28 sequentially acquires the detection results of the raw material detection unit 22. The residual ore control unit 28 sequentially controls the position of the movable unit 62 based on the acquired detection results.

[0060] When the residual ore control unit 28 is instructed to charge raw materials or when a predetermined raw material charging timing is reached, it sends a charging start command to each unit to start preparation operations for receiving raw materials. When the drive unit of the upper seal valve 32 receives the charging start command, it opens the upper seal valve 32 of the top bunker 10 to be received. When the drive unit of the switching chute 14 receives the charging start command, it turns the direction of the delivery port 44 toward the top bunker 10 to be received. When the drive unit 26 receives the charging start command, it rotates the drive shaft 90 so that the rotation angle of the drive shaft 90 becomes an angle (retraction rotation angle) corresponding to the retraction position. As a result, the movable unit 62 moves to the retraction position and is held there. Then, at the lower end side of the conveyor 18, loading of raw materials onto the conveyor 18 begins.

[0061] When the start of the raw material is detected, the residual ore control unit 28 checks whether the preparation operation of each unit has been completed at that timing. If the preparation operation has already been completed when the start of the raw material is detected, the residual ore control unit 28 assumes that the operation is normal and continues to control each unit. On the other hand, if the preparation operation has not been completed when the start of the raw material is detected, the residual ore control unit 28 stops the entire furnace top device 1.

[0062] When the end of the raw material is detected after the raw material input has started normally, the residual ore control unit 28 transmits a cutoff command to the drive unit 26 to position the movable unit 62 at the cutoff position a predetermined time after the end of the raw material is detected. The predetermined time is set based on the time it takes for the end of the raw material to move from the raw material detection unit 22 to the raw material input end of the conveyor 18. When the drive unit 26 receives the cutoff command, it rotates the drive shaft 90 so that the rotation angle of the drive shaft 90 becomes an angle (cutoff rotation angle) corresponding to the cutoff position. Then, the drive unit 26 maintains the cutoff rotation angle until it receives the next input start command. As a result, the movable unit 62 moves to and is held at the cutoff position.

[0063] When the movable part 62 moves to the blocking position in response to the detection of the end of the raw material, the fixed part 60 and the movable part 62 are combined to form a receiving container in the middle of the falling path of the raw material. The residual ore that has escaped from the detection of the end of the raw material is captured and held in this receiving container.

[0064] Thereafter, when the residual ore control unit 28 is instructed to charge the next batch of raw materials, or when the timing for charging the next batch of raw materials arrives, it transmits a command to start charging the next batch to each unit. When the drive unit 26 receives the command, it rotates the drive shaft 90 so that the rotation angle of the drive shaft 90 becomes the retraction rotation angle. This causes the receiving container to be disassembled into the fixed part 60 and the movable part 62.

[0065] Then, the residual ore captured in the receiving vessel falls from the residual ore treatment section 24 as the movable section 62 is retracted. In addition, in the retracted position, the angle of the bottom section 82 with respect to the horizontal plane is set to be equal to or greater than the angle of repose of the raw material. Therefore, in the retracted position, the residual ore on the bottom section 82 can be reliably dropped. The residual ore then passes through the discharge port 52 of the conveyor head cover 20 and the raw material inlet port 30 of the top bunker 10 and is charged into the top bunker 10.

[0066] In this way, the residual ore control unit 28 moves the movable part 62 from the retreat position to the blocking position in response to the detection of the end of the raw material by the raw material detection unit 22. Then, the movable part 62 and the fixed part form a receiving container, and the residual ore, which is the raw material after the detected end, can be captured by the receiving container before it reaches the discharge port 52. In other words, when the end of the raw material is detected, the residual ore is prevented from reaching the upper seal valve 32. As a result, in the furnace top device 1 of the first embodiment, even if the upper seal valve 32 of the furnace top bunker 10 is closed in response to the detection of the end of the raw material, it is possible to prevent the residual ore from being caught between the valve seat 34 and the valve body 36 of the upper seal valve 32. As a result, in the furnace top device 1 of this embodiment, it is possible to prevent the airtightness of the furnace top bunker 10 from decreasing.

[0067] FIG. 7 is a schematic cross-sectional view showing the configuration of the furnace top device A of the comparative example. In the furnace top device A of the comparative example shown in FIG. 7, a funnel-shaped residual ore hopper A10 and a receiving gate A12 that opens and closes the bottom end of the residual ore hopper A10 are provided between the conveyor head cover 20 and the switching chute 14. In the furnace top device A of the comparative example, the receiving gate A12 is closed in response to detection of the end of the raw material. This makes it possible for the residual ore to be captured by the receiving gate A12 in the furnace top device A of the comparative example.

[0068] However, in the furnace top equipment A of the comparative example, the height of the furnace top equipment A is increased by the height of the residual ore hopper A10 and the receiving gate A12, as shown by the double arrow A14 in Fig. 7. If the height of the furnace top equipment A is increased, for example, the length of the conveyor 18 needs to be increased, and the entire equipment becomes larger.

[0069] In addition, when adding the residual ore hopper A10 and the receiving gate A12 to an existing furnace top equipment that does not have the residual ore hopper A10 and the receiving gate A12, the machine height increases, so the existing equipment needs to be significantly modified. If the residual ore hopper A10 and the receiving gate A12 are provided while maintaining the machine height of the existing furnace top equipment, for example, it is necessary to reduce the capacity of the furnace top bunker to adjust the machine height, which may reduce the efficiency of operation.

[0070] In contrast, in the furnace top equipment 1 of the first embodiment, the residual ore processing unit 24, such as the movable part 62, is provided inside the conveyor head cover 20, so the residual ore processing unit 24 does not increase the height of the furnace top equipment 1. As a result, in the furnace top equipment 1 of the first embodiment, it is possible to prevent the machine height from increasing, and to suppress the size of the entire facility.

[0071] In addition, when the residual ore processing unit 24 is added to an existing furnace top apparatus that does not have the residual ore processing unit 24 to form the furnace top apparatus 1 of the first embodiment, the residual ore processing unit 24 can be added without increasing the height of the machine. Therefore, the furnace top apparatus 1 of the first embodiment can be easily applied to an existing furnace top apparatus. In addition, the furnace top apparatus 1 of the first embodiment does not need to reduce the capacity of the existing furnace top bunker, and it is possible to prevent a decrease in the efficiency of operation.

[0072] As described above, according to the furnace top apparatus 1 of the first embodiment, it is possible to prevent a decrease in airtightness of the furnace top bunker 10 while suppressing the machine height.

[0073] In the first embodiment, the movable part 62 of the residual ore treatment part 24 includes the auxiliary plate part 86. However, the auxiliary plate part 86 may be omitted. In this case, when the movable part 62 is in the blocking position, the edge of the conveyor 18 in the width direction of the second fixed plate 72 may be combined with the side part 84 to form a receiving container.

[0074] In the first embodiment, the fixed portion 60 of the residual ore processing section 24 includes the first fixed plate 70 and the second fixed plate 72. However, it is sufficient that the fixed portion 60 of the residual ore processing section 24 includes at least the first fixed plate 70, and the second fixed plate 72 does not have to be fixedly disposed. In this case, the second support portion 76 is omitted, and the second fixed plate 72 may be connected to the bottom surface portion 82 and function as a part of the movable portion 62.

[0075] In the first embodiment, the fixed part 60 is provided as a part of the residual ore processing part 24. However, the fixed part 60 may be omitted. In this case, the receiving container does not need to be formed when the movable part 62 is in the blocking position. This is because the movable part 62 including the bottom part 82 is arranged in the blocking position, so that the movable part 62 can suppress the residual ore from falling. However, an aspect in which the fixed part 60 that forms the receiving container together with the movable part 62 is provided can capture the residual ore more reliably.

[0076] Furthermore, the drive mechanism 64 in the first embodiment includes the first arm 92a, the second arm 92b, the third arm 92c, the first connecting portion 94a, and the second connecting portion 94b. However, the drive mechanism 64 is not limited to the illustrated configuration, and any configuration that causes the movable portion 62 to swing can be applied.

[0077] In the first embodiment, the drive mechanism 64 for swinging the movable part 62 is provided separately from the swinging rotation shaft 80. However, the drive mechanism 64 may be omitted, and the drive device 26 may directly drive the rotation shaft 80 to swing the movable part 62.

[0078] (Modification of the first embodiment) Fig. 8 is a schematic cross-sectional view showing the configuration of a furnace top apparatus 100 according to a modified example of the first embodiment. This furnace top apparatus 100 differs from the first embodiment in that it has a residual ore processing section 124 instead of the residual ore processing section 24 and a drive mechanism 164 instead of the drive mechanism 64. The residual ore processing section 124 differs from the first embodiment in that it has a movable section 162 instead of the movable section 62. Fig. 8 shows the case where the movable section 162 is in the retracted position.

[0079] The residual ore processing unit 124 is provided inside the conveyor head cover 20. The bottom surface portion 182 of the movable part 162 is formed in a flat plate shape. The bottom surface portion 182 is arranged inclined to the horizontal plane by an angle of repose or more of the raw material. The drive shaft 190 of the drive mechanism 164 is connected to the bottom surface portion 182. The movable part 162 can slide along the inclination direction of the bottom surface portion 182 according to the rotation of the drive shaft 190. The movable part 162 can move between the retracted position and the blocking position by sliding in the inclination direction of the bottom surface portion 182. The side surface portion 184 of the movable part 162 is connected to each edge of the conveyor 18 in the width direction of the bottom surface portion 182. The side surface portion 184 is formed in a plate shape extending vertically upward from the bottom surface portion 182.

[0080] 9 is a schematic cross-sectional view of the movable part 162 in the blocking position. In response to detection of the end of the raw material by the raw material detection part 22, the residual ore control part 28 moves the movable part 162 to the blocking position via the drive device 26. In the blocking position, the movable part 162 forms a receiving container together with the fixed part 60. The residual ore is captured by this receiving container before it reaches the discharge port 52.

[0081] Therefore, in the furnace top apparatus 100 of the modified example of the first embodiment, it is possible to prevent a decrease in the airtightness of the furnace top bunker 10 while suppressing the machine height, similarly to the first embodiment.

[0082] Second embodiment 10 is a schematic cross-sectional view showing the configuration of the furnace top apparatus 200 according to the second embodiment. The furnace top apparatus 200 of the second embodiment differs from the first embodiment in that it has a residual ore processing unit 224 instead of the residual ore processing unit 24 and omits the drive mechanism 64. The residual ore processing unit 224 is provided in the conveyor head cover 20. The residual ore processing unit 224 includes a movable plate 260 and a movable container 262.

[0083] The movable plate 260 is formed in a plate shape that spreads in the width direction of the conveyor 18. The movable plate 260 is bent in stages from the vertical upper edge to the vertical lower edge. The vertical upper edge of the movable plate 260 is connected to a first rotating shaft 264. The first rotating shaft 264 is supported on the side of the conveyor head cover 20 and is rotatable around a central axis extending in the width direction of the conveyor 18. The driving device 26 can drive the first rotating shaft 264. Therefore, the movable plate 260 can swing around the first rotating shaft 264, and can move between a retracted position and a blocking position by swinging around the first rotating shaft 264.

[0084] The movable container 262 is located between the conveyor head pulley 16 and the discharge port 52. The movable container 262 is a container that is long in the width direction of the conveyor 18, and is formed, for example, in a rectangular shape. The movable container 262 has an opening 266 that opens in one direction intersecting the width direction of the conveyor 18. The end face of the movable container 262 in the width direction of the conveyor 18 is connected to the end of a second rotating shaft 268. The second rotating shaft 268 is supported by the side of the conveyor head cover 20 and is rotatable around a central axis extending in the width direction of the conveyor 18. In other words, the movable container 262 is capable of changing the opening direction of the opening 266 around the second rotating shaft 268 extending in the width direction of the conveyor 18. The driving device 26 can drive the second rotating shaft 268.

[0085] Therefore, the movable container 262 can rotate around the second rotation shaft 268, and can be switched between a discharging position and a receiving position. The discharging position is a position in which the opening 266 of the movable container 262 opens vertically downward from the horizontal. The receiving position is a position in which the opening 266 of the movable container 262 opens vertically upward from the horizontal.

[0086] 10 shows the movable plate 260 in the retracted position. When the movable plate 260 is in the retracted position, the tip of the movable plate 260 on the vertically lower side is in a position outside the falling path of the raw material. Also, when the movable plate 260 is in the retracted position, the movable container 262 is in the discharge position.

[0087] A tongue portion 270 is formed in part of the opening 266 of the movable container 262, extending from the opening 266 along the side surface of the movable container 262. The tongue portion 270 is provided so as to be located vertically below the opening 266 when the movable container 262 is in the discharging position. Furthermore, when the movable container 262 is in the discharging position, the side surface of the tongue portion 270 located vertically below forms a slope that is equal to or larger than the angle of repose of the raw material.

[0088] 11 is a schematic cross-sectional view showing the movable plate 260 in the blocking position. In response to detection of the end of the raw material by the raw material detection unit 22, the residual ore control unit 28 moves the movable plate 260 to the blocking position via the drive unit 26. As a result, the movable plate 260 is swung in a direction in which the vertically lower end approaches the conveyor 18, blocking the raw material fall path. Then, in the middle of the raw material fall path, the actual falling direction of the raw material is changed by the movable plate 260 to a direction along the movable plate 260. The residual ore then falls along the movable plate 260, and falls from the vertically lower end of the movable plate 260.

[0089] 11, the movable container 262 is located at the tip of the vertically downward side of the movable plate 260 in the blocking position. In other words, the movable container 262 is located midway along the falling path of the raw material falling from the movable plate 260 in the blocking position. Therefore, when the movable plate 260 is placed in the blocking position, the actual falling direction of the raw material is changed to a direction toward the movable container 262.

[0090] The residual ore control unit 28 switches the movable container 262 to the receiving position via the drive unit 26 in conjunction with the movement of the movable plate 260 to the blocking position. When the movable plate 260 reaches the blocking position, the movable container 262 takes the receiving position and is combined with the tip of the movable plate 260 on the vertically lower side. Specifically, the tongue portion 270 of the movable container 262 is combined with the tip of the movable plate 260 on the vertically lower side.

[0091] Then, the residual ore is guided into the movable container 262 from the vertically lower tip of the movable plate 260. As a result, the residual ore is captured and held by the movable container 262 before reaching the discharge port 52.

[0092] When the movable container 262 is in the receiving position, the movable container 262 may be in contact with the movable plate 260 in the blocking position, or may be separated from the movable plate 260 in the blocking position. However, the mode in which the movable container 262 is in contact with the movable plate 260 can more reliably capture the residual ore.

[0093] In addition, the residual ore control unit 28 changes the movable container 262 from the receiving position to the discharging position in response to the detection of the raw materials of the next batch, and moves the movable plate 260 from the blocking position to the retreat position. This separates the movable plate 260 from the movable container 262. When the movable plate 260 is moved to the blocking position, the raw materials during normal raw material charging pass between the movable container 262 and the movable plate 260, and are charged into the top bunker 10 through the discharge port 52. In addition, the residual ore held in the movable container 262 is discharged outside the movable container 262 and charged into the top bunker 10 by taking the discharging position.

[0094] Therefore, in the furnace top apparatus 200 of the second embodiment, similarly to the first embodiment, it is possible to prevent a decrease in the airtightness of the furnace top bunker 10 while suppressing the machine height.

[0095] In the second embodiment, the first rotation shaft 264 of the movable plate 260 is directly driven by the driving device 26. However, as in the first embodiment, a configuration may be used in which the movable plate 260 is indirectly swung around the first rotation shaft 264 by rotating a drive shaft separate from the first rotation shaft 264.

[0096] In the second embodiment, the movable plate 260 is configured to swing around the first rotation shaft 264. However, as in the modified example of the first embodiment, the movable plate 260 may be configured to be tilted and slid in the tilted direction.

[0097] Third embodiment 12 is a schematic cross-sectional view showing the configuration of the furnace top apparatus 300 according to the third embodiment. The furnace top apparatus 300 of the third embodiment differs from the first embodiment in that it has a residual ore processing unit 324 instead of the residual ore processing unit 24. The residual ore processing unit 324 is provided inside the conveyor head cover 20. The residual ore processing unit 324 has a fixed part 360, a movable part 362, and a drive mechanism 364.

[0098] The fixing portion 360 includes a first fixing plate 370. The first fixing plate 370 is supported on a side surface of the conveyor head cover 20 by a first support portion 74. The first fixing plate 370 is fixedly disposed on the opposite side to the retracted position with respect to the falling path of the raw materials.

[0099] The first fixed plate 370 includes a vertical portion 370a, an inclined portion 370b, and an end surface portion 370c. The vertical portion 370a is formed in a plate shape extending in the width direction and vertical direction of the conveyor 18. The length of the vertical portion 370a in the width direction of the conveyor 18 is longer than the width of the area where the raw material exists on the conveyor 18 at the vertical upper edge of the vertical portion 370a.

[0100] The inclined portion 370b is continuous with the edge of the vertical portion 370a on the vertically lower side. The inclined portion 370b is inclined so as to proceed toward the falling path of the raw material as it proceeds vertically downward. The angle of the inclined portion 370b with respect to the horizontal plane is equal to or larger than the angle of repose of the raw material.

[0101] The end surface portions 370c are formed on both ends of the vertical portion 370a and the inclined portion 370b in the width direction of the conveyor 18. The end surface portions 370c protrude vertically upward from the inclined portion 370b, and protrude from the vertical portion 370a toward the raw material falling path.

[0102] The movable part 362 is capable of moving between a retracted position and a blocking position. Fig. 12 shows the movable part 362 in the retracted position. In contrast, Fig. 13 is a schematic cross-sectional view of the movable part 362 in the blocking position. Hereinafter, the movable part 362 and the drive mechanism 364 will be described with reference to Figs. 12 and 13.

[0103] The movable part 362 includes a rotating shaft 380, a rear surface part 381, a bottom surface part 382, ​​a side surface part 384, and an auxiliary arm part 386. The rotating shaft 380 extends in the width direction of the conveyor 18. The rotating shaft 380 is located on the opposite side of the conveyor 18 with respect to the falling path of the raw materials, and is provided at a lower height position than the drive shaft 90. The rotating shaft 380 is supported by a rotating shaft support part 380a connected to the conveyor head cover 20 so as to be rotatable around the central axis of the rotating shaft 380.

[0104] As shown in FIG. 13, the rear surface portion 381 is formed in a plate shape that expands in the width direction and vertical direction of the conveyor 18 when in the blocking position. When in the blocking position, the rear surface portion 381 is disposed opposite the vertical portion 370a of the first fixed plate 370, with the raw material falling path therebetween. The length of the rear surface portion 381 in the width direction of the conveyor 18 is longer than the width of the raw material presence area on the conveyor 18. The vertical upper edge of the rear surface portion 381 is located vertically above the raw material presence area when the raw material falls from the conveyor 18 when in the blocking position. The rear surface portion 381 is provided with a protruding portion 381a that protrudes from the rear surface portion 381. The protruding portion 381a is provided on the opposite side of the conveyor 18, near the vertical upper edge of the rear surface portion 381.

[0105] The bottom surface portion 382 includes a lower surface portion 382a and an inclined portion 382b. As shown in Fig. 13, the lower surface portion 382a is formed in a plate shape that extends in the width direction and horizontal direction of the conveyor 18 when in the blocking position. The inclined portion 382b is continuous with the vertically lower edge of the rear surface portion 381. The inclined portion 382b is inclined so as to approach the lower surface portion 382a as it proceeds vertically downward from the vertically lower edge of the rear surface portion 381. The vertically lower edge of the inclined portion 382b is continuous with the edge of the lower surface portion 382a on the rear surface portion 381 side.

[0106] The side surface portion 384 is connected to each edge of the conveyor 18 in the width direction at the bottom surface portion 382. The side surface portion 384 is formed in a plate shape extending vertically upward from the bottom surface portion 382 when in the blocking position. The side surface portion 384 is also connected to each edge of the conveyor 18 in the width direction at the rear surface portion 381.

[0107] One end of the auxiliary arm portion 386 is connected to the rotating shaft 380. The other end of the auxiliary arm portion 386 is connected to the side portion 384 via an auxiliary connecting portion 386a. The central axis of the auxiliary connecting portion 386a extends in the width direction of the conveyor 18. The movable portion 362 is capable of revolving around the central axis of the rotating shaft 380 and is also capable of rotating about its own axis around the central axis of the auxiliary connecting portion 386a.

[0108] The drive mechanism 364 includes a drive shaft 90, an arm portion 392, and a connecting portion 394. The drive shaft 90 is disposed on the opposite side of the conveyor 18 with respect to the movable portion 362 in the retracted position. The drive shaft 90 is supported on a side surface of the conveyor head cover 20, and is rotatable around a central axis extending in the width direction of the conveyor 18.

[0109] One end of the arm portion 392 is connected to the drive shaft 90. The other end of the arm portion 392 is connected to the protruding portion 381a of the movable portion 362 via a connecting portion 394. The central axis of the connecting portion 394 extends in the width direction of the conveyor 18. The movable portion 362 is capable of revolving around the central axis of the drive shaft 90 and is also capable of rotating around the central axis of the connecting portion 394.

[0110] When the drive device 26 receives the closing start command, it rotates the drive shaft 90 so that the rotation angle of the drive shaft 90 becomes the retraction rotation angle. As a result, the movable part 362 moves to and is held at the retraction position as shown in FIG.

[0111] 12, when the drive device 26 receives a cut-off command, it rotates the drive shaft 90 so that the rotation angle of the drive shaft 90 becomes the cut-off rotation angle. Then, the end of the arm portion 392 on the side of the connecting portion 394 is tilted downward. In response to the tilt of the arm portion 392, the end of the auxiliary arm portion 386 on the side of the side portion 384 is tilted downward with the rotation shaft 380 as a fulcrum. As a result, the movable portion 362 moves in a direction approaching the fixed portion 360, and rotates on its own axis so that the lower surface portion 382a of the bottom surface portion 382 is horizontal, thereby adjusting its posture.

[0112] As shown in Fig. 13, when the movable part 362 is moved to the blocking position and held there, the fixed part 360 and the movable part 362 are combined to form a receiving container in the middle of the falling path of the raw material. The residual ore that escapes from the detection of the end of the raw material is captured and held in this receiving container.

[0113] When the drive unit 26 receives the next input start command, it rotates the drive shaft 90 so that the rotation angle of the drive shaft 90 becomes the retraction rotation angle. Then, the end of the connecting portion 394 of the arm portion 392 is lifted upward, and the end of the side portion 384 of the auxiliary arm portion 386 is lifted upward with the rotating shaft 380 as a fulcrum. As a result, the movable portion 362 separates from the fixed portion 360, and the receiving container is disassembled into the fixed portion 360 and the movable portion 362.

[0114] The movable part 362 is rotated in a direction in which the inclination of the inclined part 382b with respect to the horizontal plane increases as the movable part 362 moves away from the fixed part 360. In the retracted position, the angle of the lower part 382a with respect to the horizontal plane is set to be equal to or greater than the angle of repose of the raw material. Therefore, in the retracted position, the residual ore on the bottom part 382 can be reliably dropped.

[0115] In this way, in the furnace top apparatus 300 of the third embodiment, similarly to the first embodiment, it is possible to prevent a decrease in the airtightness of the furnace top bunker 10 while suppressing the mechanism.

[0116] Furthermore, in the furnace top device 300 of the third embodiment, the rear surface portion 381 is configured as part of the movable portion 362, so that it is possible to suppress wear of the rear surface portion 381 compared to the first embodiment having the second fixed plate 72.

[0117] Although one embodiment has been described above with reference to the accompanying 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 think of various modified or altered examples within the scope of the claims, and it is understood that these also naturally belong to the technical scope of the present disclosure. [Explanation of symbols]

[0118] 1, 100, 200, 300 Furnace top device 10 Furnace Bunker 18 Conveyor 20 Conveyor head cover 22 Raw material detection unit 28 Residual ore control section 32 Upper seal valve 52 Outlet 60, 360 fixed part 62, 162, 362 moving parts 70, 370 1st fixed plate 80, 380 rotation axis 260 Movable plate 262 Movable container 264 First Rotation Axis 266 Opening 268 Second Rotation Axis

Claims

1. a conveyor head cover that surrounds the raw material input end of the conveyor; a movable portion provided within the conveyor head cover and movable between a retreat position where the raw material can pass through the discharge port of the conveyor head cover and a blocking position midway along the falling path of the raw material; A fixing part including at least a first fixing plate fixed and arranged on the opposite side of the withdrawal position with respect to a falling path of the raw material; Equipped with The movable part forms a receiving vessel together with the fixed part in the blocking position.

2. A raw material detection unit that detects the end of the raw material fed from the conveyor; a control unit that moves the movable unit from the retreat position to the cutoff position in response to detection of an end of the raw material by the raw material detection unit; The furnace top apparatus of claim 1 further comprising:

3. The furnace top apparatus according to claim 1 or 2, wherein the movable part is capable of moving between the retracted position and the blocking position by swinging about a first rotation axis extending in a width direction of the conveyor.

4. a conveyor head cover that surrounds the raw material input end of the conveyor; a movable portion provided within the conveyor head cover and movable between a retreat position where the raw material can pass through the discharge port of the conveyor head cover and a blocking position midway along the falling path of the raw material; A fixing part including at least a first fixing plate fixed and arranged on the opposite side of the withdrawal position with respect to a falling path of the raw material; Equipped with The movable part has a bottom surface portion inclined with respect to a horizontal plane, and is capable of moving between the retracted position and the blocking position by sliding the bottom surface portion in the inclined direction, and forms a receiving container together with the fixed part at the blocking position.

5. a conveyor head cover that surrounds the raw material input end of the conveyor; a movable portion provided within the conveyor head cover and movable between a retreat position where the raw material can pass through the discharge port of the conveyor head cover and a blocking position midway along the falling path of the raw material; a movable container that is located at a tip end of a vertically lower end of the movable portion at the blocking position and that is capable of changing an opening direction of an opening portion about a second rotation axis that extends in a width direction of the conveyor; A furnace top device comprising:

6. The furnace top apparatus according to claim 5, further comprising a control unit that opens the movable container vertically above the horizontal when the movable part is in the blocking position, and opens the movable container vertically below the horizontal when the movable part is in the retracted position.

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