CN113167535A

CN113167535A - Furnace roof device

Info

Publication number: CN113167535A
Application number: CN201980077961.3A
Authority: CN
Inventors: 菅原尚文
Original assignee: Paul Wurth IHI Co Ltd
Current assignee: Paul Wurth IHI Co Ltd
Priority date: 2018-11-28
Filing date: 2019-09-26
Publication date: 2021-07-23
Anticipated expiration: 2039-09-26
Also published as: KR102527177B1; JP7202860B2; KR20210053974A; CN113167535B; WO2020110444A1; JP2020085378A

Abstract

The present invention provides a furnace top device (20) comprising: a furnace top hopper (22) provided with a feed opening (50) at the upper part thereof; a movable plate (40) which is arranged above the charging opening (50) and is provided with a furnace top hopper (22) and can move the position of the plate surface; and a first fixing plate (44) which is arranged in the furnace top hopper (22) in an inclined manner relative to the horizontal plane. The furnace top device (20) can control the falling position of the raw material in the furnace top hopper (22) by swinging the movable plate (40).

Description

Furnace roof device

Technical Field

The present disclosure relates to a roof assembly.

Background

Some of the furnace top devices are those in which a plurality of furnace top hoppers whose central axes are eccentric with respect to the furnace center are arranged around the furnace center. Patent document 1 discloses the following technique: an upper baffle capable of adjusting the angle relative to the plumb line is arranged at the upper part in the furnace top hopper, and a lower baffle capable of adjusting the angle relative to the plumb line is arranged at the lower part in the furnace top hopper. In such a technique, the falling position of the raw material in the top hopper can be controlled by changing the angle of the upper baffle.

Documents of the prior art

Patent document

Patent document 1: japanese patent No. 6102495

Disclosure of Invention

Problems to be solved by the invention

In the technique of patent document 1, a driving device for changing the angle of the upper baffle needs to be provided outside the side surface of the furnace top hopper. Therefore, when a plurality of top hoppers are arranged in a row, the installation position of the drive device for the upper shutter may interfere with another top hopper, another drive device for the upper shutter, and the like.

Therefore, when the upper baffle is provided, a plurality of top hoppers cannot be arranged. Further, when a plurality of top hoppers are arranged, the upper baffle cannot be provided.

The present invention aims to provide a furnace top device capable of controlling the dropping position of raw materials even if a plurality of furnace top hoppers are arranged.

Means for solving the problems

In order to solve the above problem, a furnace top device according to one aspect of the present disclosure includes: a furnace top hopper, the upper part of which is provided with a feeding port; a movable plate which is arranged above the charging opening and outside the furnace top hopper and can move the position of the plate surface; and a first fixing plate which is arranged in the furnace top hopper in an inclined manner relative to the horizontal plane.

Further, a plurality of the top hoppers may be provided around the furnace center, a switching chute capable of switching the direction of the discharge port around the furnace center may be further provided vertically above the top hoppers, and the movable plate may be provided between the discharge port of the switching chute and the inlet port of the top hoppers.

The first fixing plate may be inclined such that the furnace center side end is positioned vertically above the furnace outer side end, and a second fixing plate may be further provided in the furnace top hopper, the second fixing plate being positioned horizontally above the first fixing plate on the furnace center side and inclined with respect to the horizontal plane.

Further, a third fixing plate may be further provided in the furnace top hopper, the third fixing plate being positioned between the first fixing plate and the second fixing plate and being inclined with respect to the horizontal plane.

The third fixing plate may have a flow dividing portion that rises with respect to the inclined surface and has a width in a direction perpendicular to the inclined direction that increases from an upstream side end toward a downstream side end.

Further, the furnace top hopper may further include a movable plate control unit that controls an inclination angle of the movable plate before starting charging the raw material into the furnace top hopper or in the middle of a raw material charging step from the start of charging the raw material into the furnace top hopper to the end of charging.

The effects of the invention are as follows.

According to the present disclosure, even if a plurality of top hoppers are arranged, the falling position of the raw material can be controlled.

Drawings

Fig. 1 is a schematic view of a vertical furnace system including the furnace top device of the present embodiment.

Fig. 2 is a partially enlarged view showing the top hopper and the receiving hopper in an enlarged manner.

Fig. 3 is a top view of the receiving hopper.

Fig. 4 is an explanatory view for explaining the operation of the furnace top device in the case where the size of the particles of the discharged raw material is changed with time in the order of large particles → medium particles → small particles.

Fig. 5 is an explanatory view for explaining the operation of the furnace top device in the case where the size of the particles of the discharged raw material is changed over time in the order of small particles → medium particles → large particles.

Fig. 6 is an explanatory view for explaining the operation of the furnace top device in the case where the particle size of the discharged raw material is intended to be constant regardless of the discharge time.

Fig. 7 is an explanatory view for explaining the operation of the furnace top device in the case where the inclination angle of the movable plate is changed in the middle of the raw material charging step.

Fig. 8 is a partially enlarged view of a furnace top device according to a first modification example of the structure for diverting the raw material around the furnace center.

Fig. 9 is a partially enlarged view of the third fixing plate as viewed from the hollow arrow IX direction of fig. 8.

Fig. 10 is an explanatory view for explaining an operation in the case where the raw material is dropped through the flow dividing portion.

Fig. 11 is an explanatory view for explaining an operation in a case where the inclination angle of the movable plate is changed sequentially in the roof apparatus having the flow dividing portion.

Fig. 12 is a partially enlarged view of a roof apparatus according to a second modification.

Fig. 13 is a partially enlarged view of a furnace ceiling device according to a third modification.

Fig. 14 is a partially enlarged view of a furnace ceiling device according to a fourth modification.

Fig. 15 is a partially enlarged view of the roof apparatus in a state where the piston rod is pulled out to the maximum.

Fig. 16 is a partially enlarged view of the roof arrangement with the piston rod partially pulled out.

Detailed Description

Hereinafter, one embodiment of the present disclosure is described in detail with reference to the accompanying drawings. Dimensions, materials, other specific numerical values, and the like shown in the embodiment are mere examples for facilitating understanding, and the present disclosure is not limited thereto unless otherwise specified. In the present specification and the drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, overlapping description of the elements is omitted, and elements not directly related to the present disclosure are not illustrated.

Fig. 1 is a schematic view of a vertical furnace system 1 including a furnace top device 20 according to the present embodiment. In fig. 1, the moving direction of the raw material M is shown by an arrow of a two-dot chain line. In fig. 1, the flow of the control signal is shown by a dashed arrow.

The vertical furnace system 1 includes a vertical furnace 10 and a furnace top device 20. The ceiling device 20 includes a ceiling hopper 22, a receiving hopper 24, a switching chute 26, a conveyor head pulley 28, a conveyor 30, a collecting hopper 32, a vertical chute 34, a distribution chute (rotary chute) 36, a distribution chute driving device (rotary chute driving device) 38, a movable plate 40, a movable plate control portion 42, a first fixed plate 44, a second fixed plate 46, and a third fixed plate 48.

The vertical furnace 10 is a blast furnace that generates iron from a raw material M such as iron ore and coke. The vertical furnace 10 is not limited to a blast furnace. The vertical furnace 10 is formed in a substantially cylindrical shape.

A plurality of (e.g., three) top hoppers 22 are disposed above the vertical furnace 10. The top hopper 22 is a hollow vessel. Each top hopper 22 is disposed eccentrically with respect to the furnace center of the vertical furnace 10. The top hoppers 22 are arranged at equal intervals (for example, 120-degree intervals) around the furnace center. With respect to the top hoppers 22 on the right in fig. 1, one of the three top hoppers 22 is shown in cross-section. With respect to the top hopper 22 on the left side of fig. 1, the other top hopper 22 of the three is shown in side view.

The number of top hoppers 22 is not limited to three, and may be, for example, two or four. In the case where the number of the top hoppers 22 is two, the top hoppers 22 are arranged at 180-degree intervals around the furnace center. In the case where the number of the top hoppers 22 is four, the top hoppers 22 are arranged at intervals of 90 degrees around the furnace center.

A charging port 50 for communicating the inside and outside of the furnace top hopper 22 is formed in the upper portion of the furnace top hopper 22. The inlet 50 opens vertically upward.

The receiving hopper 24 is disposed vertically above the furnace top hopper 22. The receiving hopper 24 is formed to be hollow and is arranged substantially on the extension line of the furnace core. A plurality of (for example, three) lower opening portions 52 that open toward the respective top hoppers 22 are formed in the lower portion of the receiving hopper 24. The lower opening portions 52 are formed at equal intervals (for example, at intervals of 120 degrees) around the furnace core. The lower opening 52 is located vertically above the inlet 50 of the top hopper 22.

The switching groove 26 is disposed at an upper portion in the receiving hopper 24. The switching chute 26 is formed in a curved tubular shape that communicates the inside and outside of the receiving hopper 24. A receiving opening 54 that opens vertically upward to the outside of the receiving hopper 24 is formed at one end of the switching chute 26. A discharge port 56 that opens toward the lower opening 52 of the receiving hopper 24 is formed at the other end of the switching chute 26.

The receiving opening 54 is centered on the extension of the core. The switching chute 26 is rotatable about a central axis passing through the center of the receiving opening 54. That is, the switching chute 26 can switch the direction of the discharge port 56 around the furnace center, and thus the switching chute 26 can select the lower opening portion 52 facing the discharge port 56. The switching chute 26 is not limited to the rotary type, and may be a so-called flap type or a swing type.

The conveyor head pulley 28 is disposed vertically above the receiving hopper 24. The conveyor 30 is coupled to the conveyor head pulley 28. The conveyor 30 extends in a manner separated from the receiving hopper 24.

The conveyor 30 conveys the raw material M to be charged into the vertical furnace 10 to the conveyor head pulley 28. The conveyor head pulley 28 feeds the material M into the switching chute 26 through the receiving port 54. The switching chute 26 distributes the charged raw material M to any one of the plurality of (e.g., three) top hoppers 22. The top hopper 22 temporarily stores the raw material M charged through the switching chute 26.

The collecting hopper 32 is disposed between the top hopper 22 and the vertical furnace 10. The collecting hopper 32 is formed in a hollow conical shape and is arranged substantially on the extension line of the furnace core. The lower part of each top hopper 22 is guided to the upper part of the collecting hopper 32.

The vertical chute 34 is formed in a hollow cylindrical shape and extends vertically downward from the collecting hopper 32. The lower end of the vertical chute 34 is inserted into the vertical furnace 10.

A distribution chute 36 is located within the vertical furnace 10. The distribution chute 36 is formed in a cylindrical shape, for example. One end of the distribution chute 36 is connected to the lower end of the vertical chute 34. The distribution chute 36 is inclined such that the furnace wall side is positioned vertically below the furnace core side (the vertical chute 34 side).

The distribution chute driving device 38 is disposed at an upper portion of the vertical furnace 10. The distribution chute 36 is rotatable (turnable) about a rotation axis along the furnace core by a distribution chute driving device 38, and the furnace wall side is tiltable about the furnace core side as a fulcrum.

The top hopper 22 discharges the stored raw material M to the collecting hopper 32 at a predetermined timing. The collecting hopper 32 discharges the raw material M supplied from the top hopper 22 to the distribution chute 36 through the vertical chute 34. The distribution chute 36 feeds the raw material M supplied from the collecting hopper 32 into the vertical furnace 10 while rotating and tilting the raw material M. The vertical furnace 10 reduces the charged raw material M to produce iron.

The movable plate 40 is provided above (vertically above) the inlet 50 of the furnace top hopper 22 outside the furnace top hopper 22. Specifically, the movable plate 40 is disposed within the receiving hopper 24. The movable plate 40 can swing about a rotation axis in the horizontal direction. That is, the movable plate 40 can change the inclination angle with respect to the horizontal plane.

The movable panel control section 42 is constituted by a semiconductor integrated circuit including a Central Processing Unit (CPU), a ROM storing programs and the like, a RAM as a work area, and the like. The movable plate control unit 42 controls the inclination angle of the movable plate 40 by swinging (rotating) the movable plate 40 according to the method of depositing the raw material M in the furnace top hopper 22.

The movable plate control section 42 controls the inclination angle of the movable plate 40 before starting the charging of the raw material M into the top hopper 22. The movable plate control unit 42 may control the inclination angle of the movable plate 40 in the middle of the raw material charging step from the start of charging the raw material M into the top hopper 22 to the end of charging.

The first fixing plate 44, the second fixing plate 46, and the third fixing plate 48 are formed in a plate shape, and are provided in the furnace top hopper 22. The first fixing plate 44, the second fixing plate 46, and the third fixing plate 48 are positioned above the center positions in the vertical direction in the furnace top hopper 22. The first fixing plate 44, the second fixing plate 46, and the third fixing plate 48 are arranged in a horizontal direction. The first, second and

third retaining plates

44, 46, 48 are inclined to the horizontal and are secured to the top hopper 22. Hereinafter, the first fixing plate 44, the second fixing plate 46, and the third fixing plate 48 are sometimes collectively referred to simply as a fixing plate.

The movable plate 40, the first fixed plate 44, the second fixed plate 46, and the third fixed plate 48 function as a control plate for controlling the dropping position (deposition position) of the raw material M in the top hopper 22.

Fig. 2 is a partially enlarged view showing the top hopper 22 and the receiving hopper 24 in an enlarged manner. In fig. 2, a furnace core (an extension line of the furnace core) is shown by a one-dot chain line C1, and a central axis of the furnace top hopper 22 is shown by a one-dot chain line C2. Hereinafter, the side relatively close to the furnace core is referred to as the furnace core side, and the side relatively far from the furnace core is referred to as the furnace outer side.

The top hopper 22 is divided into a cylindrical portion 60 located above approximately half of the vertical direction and a conical portion 62 located below approximately half of the cylindrical portion 60 in the vertical direction. The inlet 50 is formed in the upper portion of the cylindrical portion 60. The inlet 50 is located on the furnace center side with respect to the central axis (one-dot chain line C2) of the furnace top hopper 22. The inlet 50 is provided with a sealing valve 64 for opening and closing the inlet 50.

The conical portion 62 is formed in a hollow conical shape in which the horizontal cross-sectional area gradually decreases vertically downward. A furnace top hopper discharge port 66 for communicating the inside and outside of the furnace top hopper 22 is provided at the lower portion of the conical portion 62. The top hopper discharge port 66 is located on the core side with respect to the central axis of the top hopper 22. The top hopper discharge port 66 is provided with a shutter 68 for opening and closing the top hopper discharge port 66.

The first fixing plate 44, the second fixing plate 46, and the third fixing plate 48 are positioned vertically above the conical portion 62 (in the cylindrical portion 60). The first fixing plate 44, the second fixing plate 46, and the third fixing plate 48 are disposed with the surfaces of the plates facing upward. The first fixing plate 44, the second fixing plate 46, and the third fixing plate 48 are arranged such that the surfaces of the plates are inclined with respect to a horizontal plane. The first fixing plate 44, the second fixing plate 46, and the third fixing plate 48 are inclined such that the furnace core side end is positioned vertically above the furnace outer side end. The upward surface of the first fixing plate 44 is a first inclined surface 44a, the upward surface of the second fixing plate 46 is a second inclined surface 46a, and the upward surface of the third fixing plate 48 is a third inclined surface 48 a.

The center side end of the first fixing plate 44 is located closer to the center side than the center axis of the top hopper 22 and vertically below the inlet 50. The furnace outer end of the first fixing plate 44 is located outside the furnace with respect to the central axis of the furnace top hopper 22. That is, the first fixing plate 44 extends from the furnace core side to the furnace outside with respect to the central axis of the furnace top hopper 22.

The position in the vertical direction of the second fixing plate 46 is substantially equal to the position in the vertical direction of the first fixing plate 44. The second fixing plate 46 is located on the furnace core side in the horizontal direction with respect to the first fixing plate 44. That is, the second fixing plate 46 is positioned on the furnace center side with respect to the central axis of the furnace top hopper 22 and vertically below the inlet 50.

The third fixing plate 48 is located between the first fixing plate 44 and the second fixing plate 46. The vertical position of the third fixing plate 48 is substantially equal to the vertical positions of the first fixing plate 44 and the second fixing plate 46. The furnace core side end of the third fixing plate 48 is located vertically below the inlet 50. The furnace outer end of the third fixing plate 48 is located closer to the furnace center than the center axis of the furnace top hopper 22. The furnace outside end of the third fixing plate 48 is located relatively close to the central axis of the furnace top hopper 22.

The core-side end of the third fixing plate 48 is located outside the furnace than the core-side end of the second fixing plate 46. The core-side end of the first fixing plate 44 is located outside the furnace with respect to the core-side end of the third fixing plate 48.

The inclination angle of the third fixing plate 48 changes in the middle of the third inclined surface 48 a. This is for adjusting the position of the core side end, the position of the furnace outside end, and the inclination direction of the third slope 48a at the furnace outside end in the third fixing plate 48. In addition, when the adjustment is not strictly necessary, the inclination angle of the third fixing plate 48 may be made constant from the furnace core side end to the furnace outer side end.

Here, in the conventional furnace top device, the falling position of the raw material M in the furnace top hopper 22 is controlled by moving a control plate (e.g., an upper shutter) in the furnace top hopper 22. In this method, it is necessary to provide a driving device for moving the control panel in the top hopper 22 outside the side surface of the top hopper 22. Therefore, when a plurality of top hoppers 22 are arranged in a row, the installation position of the drive device of the control board may interfere with another top hopper 22, another drive device, and the like.

As a result, according to the conventional technique, it is not possible to control the position of the fall of the raw material M in the top hopper 22 and to arrange a plurality of top hoppers 22 at the same time.

In contrast, in the furnace top device 20 of the present embodiment, the positions and postures of the first fixing plate 44, the second fixing plate 46, and the third fixing plate 48 are fixed in the furnace top hopper 22. Thus, in the furnace top device 20 of the present embodiment, it is not necessary to provide a driving device for moving the control plate in the furnace top hopper 22 outside the side surface of the furnace top hopper 22.

Therefore, in the furnace top device 20 of the present embodiment, a plurality of furnace top hoppers 22 can be arranged in a row. In the furnace top device 20 of the present embodiment, the drop position of the raw material M in the furnace top hopper 22 is controlled by moving the movable plate 40 in the receiving hopper 24.

An upper opening 70 is provided in an upper portion of the receiving hopper 24. The upper opening 70 communicates the inside and outside of the receiving hopper 24. The upper opening 70 is provided with a lid 72 for opening and closing the upper opening 70.

The movable plate 40 is located below the upper opening 70. Therefore, in the roof arch system 20, maintenance of the movable panel 40 can be easily performed.

The movable plate 40 is located outside the furnace with respect to the exhaust port 56. The movable plate 40 is located above the lower opening 52 located above the inlet 50. Movable plate 40 is located below the uppermost portion of discharge port 56. That is, the movable plate 40 is positioned between the discharge port 56 of the switching chute 26 and the inlet port 50 of the top hopper 22. In other words, the height position of the movable plate 40 in the vertical direction is between the discharge port 56 and the inlet port 50. The movable plate 40 is provided so as to be able to enter the middle of the dropping path of the raw material M dropping from the discharge port 56 to the inlet port 50.

The movable plate 40 includes a rotary shaft 80, a base 82, and a plate 84. The rotation shaft 80 is formed in a rod shape and extends in a direction intersecting the vertical direction and the radial direction of the receiving hopper 24. The rotating shaft 80 is supported to the receiving hopper 24. The rotating shaft 80 can rotate about its central axis. The rotary shaft 80 is located above the lowermost portion of the discharge port 56 of the switching chute 26.

Here, pressure is applied in the top hopper 22. Therefore, in the conventional roof apparatus in which the movable control plate is located in the roof hopper 22, it is necessary to perform air sealing or the like on the rotary shaft in which the control plate is movable, and the structure of the rotary shaft becomes complicated.

In contrast, no pressure may be applied to the inside of the receiving hopper 24. Therefore, in the furnace roof apparatus 20 of the present embodiment, it is not necessary to perform gas sealing or the like on the rotary shaft 80, and the structure of the rotary shaft 80 can be simplified.

The base portion 82 and the plate portion 84 are disposed below the rotating shaft 80. The base portion 82 is coupled to the rotating shaft 80. The base portion 82 extends radially from the rotary shaft 80. The plate portion 84 is formed in a plate shape. The plate portion 84 is connected to the base portion 82 such that the plate surface 86 faces the core side with respect to the plate portion 84. The height of the movable plate 40 may be set to be between the discharge port 56 and the inlet 50.

As indicated by an arrow a1 in fig. 2, the base portion 82 and the plate portion 84 can swing about the rotation shaft 80 as the rotation shaft 80 rotates. That is, the movable plate 40 can move the position of the plate surface 86. In the roof apparatus 20 of the present embodiment, the inclination angle of the plate surface 86 (the inclination angle of the movable plate 40) with respect to the horizontal plane can be set by swinging the base portion 82 and the plate portion 84.

In the furnace top device 20 of the present embodiment, the falling path of the raw material M charged into the furnace top hopper 22 can be controlled by changing the inclination angle of the movable plate 40 (plate surface 86), which will be described in detail below. If the falling path of the raw material M is changed, the fixing plate located in the falling path of the raw material M is changed. That is, in the furnace top 20 of the present embodiment, by controlling the inclination angle of the movable plate 40, it is possible to select a fixed plate through which the raw material M passes in the process of falling from the first fixed plate 44, the second fixed plate 46, and the third fixed plate 48.

Fig. 3 is a top view of the receiving hopper 24. The movable plate 40 is provided with the same number as the number of the lower openings 52. That is, the movable plate 40 is provided for each furnace top hopper 22.

Both ends of the rotary shaft 80 of the movable plate 40 penetrate the outside of the receiving hopper 24. A bearing (not shown) is provided between the receiving hopper 24 and the rotary shaft 80. The receiving hopper 24 supports the rotary shaft 80 rotatably by a bearing.

A movable plate driving unit 88 is provided at one end of the rotary shaft 80. The movable plate driving section 88 includes, for example, a rod extending in the radial direction from the rotary shaft 80 and a driver tilting the rod about the rotary shaft 80. The specific configuration of the movable plate driving unit 88 is not limited to this example. The movable plate control unit 42 controls the movable plate 40 by operating the movable plate driving unit 88.

However, when the raw material M is dropped toward the outside of the furnace with respect to the central axis of the top hopper 22, the length of the control plate in the top hopper 22 becomes long. In the conventional furnace top device in which the control plate in the furnace top hopper 22 is movable, a large torque is required to move the control plate having a long length, and the size of the drive device in which the control plate is movable is increased.

In contrast, the movable plate 40 in the present embodiment is smaller in size than the control plate (e.g., the first fixing plate 44) in the furnace top hopper 22 (see fig. 2). Therefore, in the roof apparatus 20 of the present embodiment, the torque for moving the movable plate 40 is smaller than that of the conventional roof apparatus. Therefore, in the roof system 20 of the present embodiment, the movable panel driving portion 88 can be reduced in size.

As a result, in the roof system 20 of the present embodiment, the installation position of the movable panel driving section 88 can be prevented from interfering with other devices such as other movable panel driving sections 88.

The movable plate 40 is provided with a position detection unit 90 that detects the position (i.e., the tilt angle) of the movable plate 40. The position detecting unit 90 is, for example, an absolute encoder. The position detection unit 90 is provided at the movable plate drive unit 88 side end of the rotary shaft 80. The position detecting unit 90 is not limited to an encoder, and may be a limit switch or the like.

Specifically, the position detection unit 90 detects the rotation angle of the rotating shaft 80. The movable plate control unit 42 obtains the rotation angle of the rotary shaft 80 from the position detection unit 90, and derives the position of the movable plate 40. The movable plate control section 42 operates the movable plate driving section 88 so that the position (inclination angle) of the movable plate 40 becomes the set position (inclination angle).

Next, the operation of the furnace roof apparatus 20 of the present embodiment will be described. In the furnace top device 20 of the present embodiment, the inclination angle of the movable plate 40 is set according to what kind of particle size of the discharged raw material M is to be changed as the discharge time elapses, when the raw material M is discharged from the furnace top hopper 22. The following 3 modes are examples of the transition of the particle size. In the first mode, the size of the particles of the discharged raw material M is changed with time in the order of large particles → medium particles → small particles. In the second mode, the size of the particles of the discharged raw material M is changed with time in the order of small particles → medium particles → large particles. In the third mode, the size of the particles of the discharged raw material M is made constant regardless of the discharge time.

Fig. 4 is an explanatory view for explaining the operation of the roof apparatus 20 in a case where the size of the particles of the discharged raw material M is to be changed with time in the order of large particles → medium particles → small particles. In fig. 4, the range in which the raw material M exists is indicated by a two-dot chain line. In fig. 4, the moving direction of the raw material M is indicated by an arrow of a two-dot chain line.

When the raw material M is discharged in the order of large grain → medium grain → small grain, the movable plate 40 is swung out of the furnace in the furnace top 20. In this case, the movable plate 40 is inclined at an angle (first inclination angle) such that the tip of the plate portion 84 is positioned vertically below the rotary shaft 80 and outside the furnace. Further, the plate surface 86 of the movable plate 40 is retreated toward the outside of the furnace.

In this state, when the raw material M is discharged from the discharge port 56 of the switching chute 26, the raw material M freely falls in a parabolic shape toward the lower opening 52 of the receiving hopper 24 and the inlet 50 of the top hopper 22. At this time, since the plate surface 86 is retreated to the outermost side of the furnace, the raw material M passes through the lower opening 52 and the charging port 50 without contacting the plate surface 86.

Then, the raw material M falls in the top hopper 22 to the vicinity of the upper end of the first slope 44a of the first fixing plate 44. The raw material M dropped on the first fixing plate 44 slides down the first inclined surface 44a, and freely drops in a parabolic shape from the lower end of the first inclined surface 44 a. Thereby, the raw material M falls to the outside of the furnace from the central axis of the top hopper 22, and is deposited in a mountain shape with the falling position as the apex.

Here, relatively small-sized (powdery) raw material M is accumulated near the top of the mountain. On the other hand, the relatively large-sized (lump) raw material M slides down the slope of the mountain and is deposited near the foot of the mountain.

As shown in fig. 4, when the top of the mountain is located outside the furnace with respect to the central axis of the furnace top hopper 22, large raw material M is deposited on the furnace core side with respect to the central axis of the furnace top hopper 22. Further, relatively small particles of the raw material M are deposited outside the furnace with respect to the central axis of the top hopper 22. That is, in this case, the ratio of large particles per horizontal cross-sectional area in the top hopper 22 is large and the ratio of small particles is small in the vicinity of the top hopper discharge port 66. The larger the proportion of large particles is, the larger the proportion of small particles is, the further upward the furnace top hopper is vertically from the vicinity of the discharge port 66.

Thereafter, when the gate 68 of the top hopper 22 is opened, the raw material M in the top hopper 22 is discharged vertically downward from the top hopper discharge port 66. At this time, the raw material M deposited on the lower portion of the conical portion 62 is discharged first, and the raw material M deposited on the upper portion of the conical portion 62 is discharged later. Thus, the raw material M is discharged in the order of large grains → medium grains → small grains with the lapse of the discharge time.

Therefore, when the discharge is intended in the order of large grain → medium grain → small grain, the swing of the movable plate 40 is controlled in advance by the movable plate control section 42 so that the inclination angle of the movable plate 40 becomes the first inclination angle before the charging of the raw material M into the top hopper 22 is started.

Fig. 5 is an explanatory view for explaining the operation of the furnace top 20 in a case where the size of the particles of the discharged raw material M is to be changed in time in the order of small particles → medium particles → large particles. In fig. 5, the range in which the raw material M exists is indicated by a two-dot chain line, and the moving direction of the raw material M is indicated by an arrow of the two-dot chain line.

When the raw material M is discharged in the order of small grain → medium grain → large grain, the movable plate 40 is swung toward the furnace center side in the furnace top device 20. In this case, the movable plate 40 has an inclination angle (second inclination angle) at which the tip of the plate portion 84 is positioned vertically below the rotation shaft 80 and on the core side. Further, the plate surface 86 of the movable plate 40 advances toward the core side.

In this state, when the raw material M is discharged from the discharge port 56 of the switching chute 26, the raw material M freely falls in a parabolic shape. At this time, the plate surface 86 protrudes (enters) halfway through the falling path of the material M, and therefore the material M contacts the plate surface 86 halfway through the falling path. Thereby, the falling direction of the raw material M is changed by the movable plate 40, and the raw material M falls toward the lower opening 52 and the inlet 50.

Then, the raw material M falls in the top hopper 22 to the vicinity of the upper end of the second slope 46a of the second fixing plate 46. The raw material M dropped on the second fixing plate 46 slides down the second inclined surface 46a, and freely drops in a parabolic shape from the lower end of the second inclined surface 46 a. Thereby, the raw material M falls toward the center axis of the top hopper 22, and is deposited in a mountain shape with the falling position as the apex.

As shown in fig. 5, when the top of the mountain is located closer to the furnace center than the central axis of the furnace top hopper 22, a relatively small-sized raw material M is deposited closer to the furnace center than the central axis of the furnace top hopper 22. Further, relatively large particles of the raw material M are deposited outside the furnace with respect to the central axis of the top hopper 22. That is, in this case, the ratio of large particles per horizontal cross-sectional area in the top hopper 22 is small and the ratio of small particles is large in the vicinity of the top hopper discharge port 66. The larger the proportion of large particles is, the smaller the proportion of small particles is, the more vertically upward from the top hopper discharge port 66.

Thereafter, when the gate 68 of the top hopper 22 is opened, the raw material M in the top hopper 22 is discharged vertically downward from the top hopper discharge port 66. At this time, the raw material M deposited on the lower portion of the conical portion 62 is discharged first, and the raw material M deposited on the upper portion of the conical portion 62 is discharged later. Thus, the raw material M is discharged in the order of small → medium → large with the lapse of discharge time.

Therefore, when the discharge is intended in the order of small grain → medium grain → large grain, the swing of the movable plate 40 is controlled in advance by the movable plate control portion 42 so that the inclination angle of the movable plate 40 becomes the second inclination angle before the charging of the raw material M into the top hopper 22 is started.

Fig. 6 is an explanatory view for explaining the operation of the furnace top device 20 in the case where the particle size of the discharged raw material M is intended to be constant regardless of the discharge time. In fig. 6, the range in which the raw material M exists is indicated by a two-dot chain line, and the moving direction of the raw material M is indicated by an arrow of the two-dot chain line.

In the furnace top 20, when the particle size of the raw material M is to be made constant, the movable plate 40 is swung to a position substantially at the middle of the swing range. That is, the movable plate 40 is located between the position at the first inclination angle and the position at the second inclination angle. In this case, the movable plate 40 is formed at an angle (third inclination angle) at which the tip end of the plate portion 84 is positioned on the furnace core side at the first inclination angle and outside the furnace at the second inclination angle. The plate surface 86 of the movable plate 40 moves forward toward the core side at the first inclination angle and moves backward toward the outside of the furnace at the second inclination angle.

In this state, when the raw material M is discharged from the discharge port 56 of the switching chute 26, the raw material M freely falls in a parabolic shape. At this time, the plate surface 86 protrudes to the middle of the falling path of the material M, and therefore the material M hits the plate surface 86 in the middle of the falling path. Thereby, the falling direction of the raw material M by the movable plate 40 is changed. Further, since the plate surface 86 is retreated further to the outside of the furnace than when the second inclination angle is set, the changed falling direction is a direction closer to the outside of the furnace than when the second inclination angle is set and closer to the core than when the first inclination angle is set.

Then, the raw material M falls in the top hopper 22 to the vicinity of the upper end of the third inclined surface 48a of the third fixing plate 48. The raw material M dropped on the third fixing plate 48 slides down the third inclined surface 48a, and freely drops in a parabolic shape from the lower end of the third inclined surface 48 a. Thereby, the raw material M falls down to the vicinity of the central axis of the top hopper 22, and is deposited in a mountain shape with the falling position as the apex.

As shown in fig. 6, when the top of the mountain is positioned near the central axis of the top hopper 22, small-sized raw materials are relatively deposited near the central axis of the top hopper 22. Large raw material M is relatively deposited on the furnace core side and the furnace outer side away from the central axis of the furnace top hopper 22. That is, in this case, the ratio of large particles and the ratio of small particles per horizontal cross-sectional area in the top hopper 22 are substantially constant from the top hopper discharge port 66 toward the vertically upper side.

Thereafter, when the gate 68 of the top hopper 22 is opened, the raw material M in the top hopper 22 is discharged vertically downward from the top hopper discharge port 66. At this time, the raw material M deposited on the lower portion of the conical portion 62 is discharged first, and the raw material M deposited on the upper portion of the conical portion 62 is discharged later. Thereby, the raw material M is discharged with a substantially constant particle size as the discharge time elapses.

Therefore, when the particle size of the raw material M is to be made constant, the movable plate control section 42 controls the swing of the movable plate 40 in advance so that the inclination angle of the movable plate 40 becomes the third inclination angle before the charging of the raw material M into the top hopper 22 is started.

When the particle size of the discharged raw material M is to be made constant, the inclination angle of the movable plate 40 is not limited to the third inclination angle before the start of charging the raw material M. For example, the particle size of the discharged raw material M may be made constant by changing the inclination angle of the movable plate 40 in the middle of the raw material charging step from the start of charging the raw material M to the end of charging.

Fig. 7 is an explanatory diagram for explaining the operation of the furnace top device 20 in the case where the inclination angle of the movable plate 40 is changed in the middle of the raw material charging step. In fig. 7, the range in which the raw material M exists is indicated by a two-dot chain line. In fig. 7, the moving direction of the raw material M is indicated by an arrow of a two-dot chain line.

The movable plate control unit 42 sequentially changes the inclination angle of the movable plate 40 every predetermined time in the raw material charging step. Specifically, the movable plate control section 42 sets the inclination angle of the movable plate 40 to the second inclination angle in advance before the start of charging the raw material M. When the charging of the raw material M is started in this state, the raw material M drops to a position closer to the furnace center than the center axis of the furnace top hopper 22 via the movable plate 40 and the second fixed plate 46.

When a predetermined time has elapsed from the charging of the raw material M, the movable plate control section 42 changes the inclination angle of the movable plate 40 to the third inclination angle. Then, the raw material M drops through the movable plate 40 and the third fixed plate 48 toward the vicinity of the central axis of the top hopper 22.

After that, when a predetermined time has elapsed, the movable plate control section 42 changes the tilt angle of the movable plate 40 to the first tilt angle. Then, the raw material M drops to the outside of the furnace of the central axis of the top hopper 22 via the first fixing plate 44.

When a predetermined time has elapsed while the first tilt angle is in the first state, the movable plate control unit 42 changes the tilt angle of the movable plate 40 to the third tilt angle. Then, the raw material M drops through the movable plate 40 and the third fixed plate 48 toward the vicinity of the central axis of the top hopper 22.

After that, when a predetermined time has elapsed, the movable plate control section 42 changes the inclination angle of the movable plate 40 to the second inclination angle. Then, the raw material M drops through the movable plate 40 and the second fixed plate 46 to a position closer to the furnace center than the center axis of the furnace top hopper 22.

Thus, the movable plate control section 42 repeats the swinging of the movable plate 40 every predetermined time until the raw material charging step is completed.

Thus, a mountain located on the furnace center side with respect to the central axis, a mountain near the central axis, and a mountain located outside the furnace with respect to the central axis are formed in the furnace top hopper 22. That is, in this case, the ratio of large particles and the ratio of small particles per horizontal cross-sectional area in the top hopper 22 become more constant from the top hopper discharge port 66 toward the vertically upper side.

The predetermined time for changing the tilt angle of the movable plate 40 is set so that, for example, a period during which the first tilt angle is maintained, a period during which the second tilt angle is maintained, and a period during which the third tilt angle is maintained are equal in the raw material charging step.

In the raw material charging step, the weight of the raw material M in the top hopper 22 increases. Therefore, a measuring portion for measuring the weight of the raw material M in the top hopper 22 may be provided in the top hopper 22. The movable plate control unit 42 may sequentially change the inclination angle of the movable plate 40 based on the detection result of the measuring unit.

As described above, in the furnace top device 20 of the present embodiment, the movable plate 40 is provided outside the furnace top hopper 22 and above the inlet 50, and the first fixing plate 44, the second fixing plate 46, and the third fixing plate 48 are provided in the furnace top hopper 22. In the furnace top device 20 of the present embodiment, by swinging the movable plate 40 (moving the position of the plate surface 86), a fixed plate from which the material M falls can be selected.

In the furnace top device 20 of the present embodiment, it is not necessary to provide a driving device for controlling the position of dropping the raw material M outside the side surface of the furnace top hopper 22, and interference with the installation position of the driving device does not occur. Therefore, in the furnace top device 20 of the present embodiment, a plurality of furnace top hoppers 22 can be arranged in a row.

Therefore, according to the furnace top device 20 of the present embodiment, even if a plurality of furnace top hoppers 22 are arranged, the falling position of the raw material M in the furnace top hoppers 22 can be controlled.

In the roof system 20 of the present embodiment, the movable panel 40 is provided outside the roof hopper 22, and therefore maintenance of the movable panel 40 can be performed more easily than in the case where the movable control panel is provided inside the roof hopper 22.

In the furnace top device 20 of the present embodiment, the first fixing plate 44, the second fixing plate 46, and the third fixing plate 48 are provided in the furnace top hopper 22. Therefore, in the furnace top device 20 of the present embodiment, the raw material M can be accurately dropped to the target drop position.

In the furnace top device 20 of the present embodiment, the inclination angle of the movable plate 40 can be controlled before the start of charging of the raw material M or in the middle of the raw material charging process. Therefore, in the furnace top device 20 of the present embodiment, the falling position of the raw material M can be controlled more reliably.

In the present embodiment, the first fixing plate 44, the second fixing plate 46, and the third fixing plate 48 are provided in the furnace top hopper 22. However, the present invention is not limited to the embodiment in which all of the first fixing plate 44, the second fixing plate 46, and the third fixing plate 48 are provided in the furnace top hopper 22. In the furnace top device 20, at least the first fixing plate 44 may be provided in the furnace top hopper 22, and the second fixing plate 46 and the third fixing plate may be omitted. In this case, the furnace top device 20 can select whether or not the raw material M is dropped onto the first fixed plate 44 by swinging the movable plate 40. In this embodiment, the falling position of the raw material M in the top hopper 22 can also be controlled.

In the furnace top 20, the first fixing plate 44 and the second fixing plate 46 may be provided in the furnace top hopper 22, and the third fixing plate 48 may be omitted. In this case, the second fixing plate 46 may be inclined so that the core side end is positioned vertically downward. In this embodiment, the falling position of the raw material M in the top hopper 22 can also be controlled.

(first modification)

The third fixing plate 48 of the above embodiment drops the raw material M toward the vicinity of the central axis of the top hopper 22. However, the third fixing plate 48 may be configured to drop the raw material M by dividing the raw material M around the center axis of the furnace top hopper 22.

Fig. 8 is a partially enlarged view of a furnace top device 120 according to a first modification example of the structure for diverting the raw material M around the furnace center. The roof assembly 120 differs from the roof assembly 20 in that the third retaining plate 48 is provided with a tap portion 122. The shunt portion 122 stands on the third inclined surface 48a of the third fixing plate 48.

Fig. 9 is a partially enlarged view of the third fixing plate 48 as viewed from the hollow arrow IX direction of fig. 8. The flow dividing portion 122 is formed in a triangular shape in which the width perpendicular to the direction of inclination of the third inclined surface 48a increases from the upstream side end (core side end) of the third fixing plate 48 toward the downstream side end (furnace outer side end). The upstream side apex 122a of the flow dividing portion 122 is located at the widthwise center of the third fixing plate 48. The shunt section 122 has: a slope 122b having a downstream-side end located on one side (left side in fig. 9) in the width direction of the third fixing plate 48; and a slope 122c having a downstream-side end located on the other side (right side in fig. 9) in the width direction of the third fixing plate 48.

When the raw material M is dropped onto the third fixing plate 48 of the furnace ceiling device 120, the raw material M is divided by the dividing portion 122 in the width direction of the third fixing plate 48 when sliding down from the ceiling portion 122a of the dividing portion 122 toward the downstream side end on the third inclined surface 48 a. Substantially half of the raw material M slides down the third inclined surface 48a and the inclined surface 122b and falls into the top hopper 22, and the remaining half of the raw material M slides down the third inclined surface 48a and the inclined surface 122c and falls into the top hopper 22.

Fig. 10 is an explanatory view for explaining an operation in the case where the raw material M is dropped through the flow dividing portion 122. In fig. 10, the stacking height of the raw material M is indicated by contour lines. Hereinafter, a plane passing through the center axis of the top hopper 22 and the furnace center is referred to as a reference plane. In fig. 10, the reference plane is indicated by a one-dot chain line C3.

The raw material M sliding down the third inclined surface 48a and the inclined surface 122b falls down to one side (lower side in fig. 10) with respect to the reference surface, and is accumulated in a mountain shape having a position P1 as an apex. On the other hand, the raw material M sliding down the third inclined surface 48a and the inclined surface 122c falls down to the other side (upper side in fig. 10) with respect to the reference surface, and is accumulated in a mountain shape having a position P2 as an apex. That is, in this case, two mountains of the raw material M are formed.

In this way, in the furnace top device 120, the number of mountains of the raw material M is larger than in the case where the flow dividing portion 122 is not provided. Therefore, in the furnace top device 120, the ratio of large particles and the ratio of small particles per horizontal cross-sectional area in the furnace top hopper 22 can be made more constant.

In the raw material charging step, the movable plate control section 42 of the furnace roof apparatus 120 may change the inclination angle of the movable plate 40 sequentially every predetermined time.

Fig. 11 is an explanatory diagram for explaining an operation in the case where the inclination angle of the movable plate 40 is changed sequentially in the roof system 120 having the flow dividing portion 122. In fig. 11, the stacking height of the raw material M is indicated by contour lines.

When the inclination angle of the movable plate 40 is changed in order, the mountain of the raw material M is formed with the positions P1, P2, P3, and P4 as vertexes. That is, in this embodiment, the number of peaks of the raw material M is larger than that in the embodiment in which only the raw material M is dropped onto the third fixing plate 48. Therefore, in this embodiment, the ratio of large particles and the ratio of small particles per horizontal cross-sectional area in the top hopper 22 can be further made constant.

(second modification)

Fig. 12 is a partially enlarged view of a furnace ceiling device 220 according to a second modification. The roof assembly 220 differs from the roof assembly 20 in that it has a second retaining plate 246 instead of the second retaining plate 46.

The second fixing plate 246 is inclined such that the furnace core side end is positioned vertically below the furnace outer side end. The furnace outside-side end of the second fixing plate 246 is located near the core-side end of the third fixing plate 48. The upwardly facing surface of the second fixing plate 246 becomes a second inclined surface 246 a.

When the plate surface 86 of the movable plate 40 is moved further toward the furnace core side than when the material M falls down to the third fixed plate 48, the material M that has collided with the plate surface 86 falls down to the vicinity of the upper end of the second slope 246a of the second fixed plate 246. The raw material M dropped onto the second fixed plate 246 slides down on the second inclined surface 246a, and freely drops in a parabolic shape from the lower end of the second inclined surface 246 a. Thereby, the raw material M falls toward the center axis of the top hopper 22, and is deposited in a mountain shape with the falling position as the apex.

Therefore, in the furnace top device 220, as in the above-described embodiment, by dropping the raw material M through the second fixing plate 246, the raw material M can be discharged in the order of small grain → medium grain → large grain when the raw material M is discharged from the furnace top hopper 22.

In the roof top 220, the upper end of the second fixed plate 246 is located closer to the third fixed plate 48 than the second fixed plate 46 of the above-described embodiment, and therefore the amount of swing of the movable plate 40 can be reduced.

(third modification)

Fig. 13 is a partially enlarged view of a furnace ceiling device 320 according to a third modification. The roof assembly 320 differs from the roof assembly 20 in that it has a movable panel 340 in place of the movable panel 40. In the furnace top device 320, the upper opening portion 70 and the lid portion 72 of the receiving hopper 24 are provided on the side surface of the receiving hopper 24.

The movable plate 340 includes a rotation shaft 380, a first arm 381, a second arm 382, a base portion 383, and a plate portion 384. One end of the first arm 381 is fixed to the inner surface of the receiving hopper 24. The second arm 382 is rotatably coupled to the other end of the first arm 381 via a rotation shaft 380. Base portion 383 is connected to second arm 382. The plate part 384 is coupled to the base part 383 such that the plate surface 386 faces the core side with respect to the plate part 384.

Further, a driver 387 is provided to the roof system 320. The driver 387 includes a cylinder 388 and a piston rod 389. One end of the piston rod 389 is inserted into the cylinder 388, and the other end is coupled to the base portion 383. The movable plate control unit 42 slides the piston rod 389 relative to the cylinder 388.

When the piston rod 389 is pulled in with respect to the cylinder 388, the plate 384 swings outside the furnace about the rotation shaft 380 as a rotation center. When the piston rod 389 is pulled out from the cylinder 388, the plate 384 swings toward the furnace center around the rotation shaft 380 as a rotation center. That is, the plate part 384 can swing about the rotation shaft 380 as indicated by a double arrow a31 in fig. 13.

Therefore, in the furnace top apparatus 320, as in the above-described embodiment, even if a plurality of furnace top hoppers 22 are arranged, the falling position of the raw material M in the furnace top hoppers 22 can be controlled.

(fourth modification)

Fig. 14 is a partially enlarged view of a furnace ceiling device 420 according to a fourth modification. The roof assembly 420 differs from the roof assembly 20 in that it has a movable panel 440 in place of the movable panel 40.

The movable plate 440 includes a plate portion 480. The plate section 480 has a second plate surface 482 and a third plate surface 483 facing the core side. The second plate surface 482 is located above the third plate surface 483. The second plate surface 482 is inclined such that the lower end is located closer to the furnace core than the upper end. The third plate surface 483 is inclined so that the lower end is located outside the furnace than the upper end. That is, the second plate surface 482 and the third plate surface 483 are inclined at different angles.

Further, a driver 487 is provided in the furnace ceiling device 420. The driver 487 comprises a cylinder 488 and a piston rod 489. One end of the rod 489 is inserted into the cylinder 488, and the other end is coupled to the plate 480. The actuator 487 is disposed so that the piston rod 489 extends in the vertical direction. The movable plate control unit 42 slides the piston rod 489 relative to the cylinder 488.

When the rod 489 is pulled in with respect to the cylinder 488, the plate 480 moves upward. When the rod 489 is pulled out of the cylinder 488, the plate portion 480 moves downward. That is, the plate portion 480 is movable in the vertical direction (vertical direction) as indicated by a double-headed arrow a41 in fig. 14.

In fig. 14, a case where the piston rod 489 is maximally drawn in is shown. In fig. 14, the range in which the raw material M exists is indicated by a two-dot chain line, and the moving direction of the raw material M is indicated by an arrow of the two-dot chain line.

When the piston rod 489 is maximally drawn in, the plate portion 480 is separated from the falling path of the raw material M falling from the discharge port 56 to the inlet port 50. In this case, the raw material M drops into the top hopper 22 through the first fixing plate 44.

Fig. 15 is a partially enlarged view of the roof apparatus 420 in a state where the piston rod 489 is pulled out to the maximum. In fig. 15, the range in which the raw material M exists is indicated by a two-dot chain line. In fig. 15, the moving direction of the raw material M is indicated by an arrow of a two-dot chain line.

When the piston rod 489 is pulled out to the maximum extent, the plate portion 480 enters the dropping path of the raw material M dropping from the discharge port 56 to the inlet 50, and the second plate surface 482 is positioned in the middle of the dropping path of the raw material M. As a result, the raw material M hits the second plate surface 482 in the middle of the falling path, and the falling direction is changed. In this case, the raw material M drops into the top hopper 22 through the second fixing plate 46.

Fig. 16 is a partially enlarged view of the roof apparatus 420 in a case where a part of the piston rod 489 is pulled out. In fig. 16, the range in which the raw material M exists is indicated by a two-dot chain line. In fig. 16, the moving direction of the raw material M is indicated by an arrow of a two-dot chain line.

When the piston rod 489 is partially pulled out, the plate portion 480 enters a dropping path of the raw material M dropping from the discharge port 56 to the inlet port 50, and the third plate surface 483 is positioned in the middle of the dropping path of the raw material M. Thereby, the raw material M hits the third plate surface 483 halfway in the falling path, and the falling direction is changed. In this case, the raw material M drops into the top hopper 22 through the third fixing plate 48.

In this way, in the roof apparatus 420, the movable plate 440 moves in the vertical direction. That is, in the furnace top device 420, the second plate surface 482 and the third plate surface 483 move in the vertical direction. In the furnace top device 420, the second plate surface 482 and the third plate surface 483 are moved to select a fixing plate for dropping the material M.

Therefore, in the furnace top device 420, as in the above-described embodiment, even if a plurality of furnace top hoppers 22 are arranged, the falling position of the raw material M in the furnace top hoppers 22 can be controlled.

In the fourth modification, the movable plate 440 is moved in the vertical direction. However, the movable plate 440 may be moved in the horizontal direction. In this embodiment, the second plate surface 482 and the third plate surface 483 are moved in the horizontal direction, whereby the falling position of the raw material M can be controlled.

While one embodiment has been described above with reference to the drawings, the present disclosure is not limited to the above embodiment. It is obvious to those skilled in the art that various modifications and variations can be made within the scope of the claims, and it is needless to say that these modifications and variations also fall within the technical scope of the present disclosure.

For example, the movable plate 40 may be configured to be able to slide the plate portion 84 relative to the base portion 82 in the radial direction of the rotary shaft 80. For example, the movable plate 40 may move the plate 84 back toward the radial inner side of the rotary shaft 80 when it swings outward of the furnace, and move the plate 84 toward the radial outer side of the rotary shaft 80 when it swings toward the furnace center. According to this embodiment, the degree of contact between the material M and the plate surface 86 can be accurately controlled according to the inclination angle of the movable plate 40.

Industrial applicability

The present disclosure can be applied to a furnace roof device.

Description of the symbols

20. 120, 220, 320, 420-furnace top device, 22-furnace top hopper, 26-switching chute, 40, 340, 440-movable plate, 42-movable plate control part, 44-first fixed plate, 46, 246-second fixed plate, 48-third fixed plate, 50-input port, 56-discharge port, 122-diversion part.

Claims

1. A furnace top device is characterized by comprising:

a furnace top hopper, the upper part of which is provided with a feeding port;

a movable plate which is provided above the inlet outside the furnace top hopper and which can move the position of the plate surface; and

and a first fixing plate provided in the furnace top hopper so as to be inclined with respect to a horizontal plane.

2. The roof arrangement according to claim 1,

a plurality of the furnace top hoppers are arranged around the furnace core,

a switching chute is further provided vertically above the furnace top hopper, the switching chute being capable of switching the direction of the discharge port around the furnace center,

the movable plate is provided between the discharge port of the switching chute and the inlet of the furnace top hopper.

3. The roof arrangement according to claim 1 or 2,

the first fixing plate is inclined so that the furnace core side end is positioned vertically above the furnace outer side end,

the furnace top hopper further includes a second fixing plate that is positioned on the furnace core side in the horizontal direction with respect to the first fixing plate and is provided so as to be inclined with respect to the horizontal plane.

4. The roof arrangement according to claim 3,

the furnace top hopper further includes a third fixing plate disposed between the first fixing plate and the second fixing plate and inclined with respect to a horizontal plane.

5. The roof arrangement according to claim 4,

the third fixing plate has a flow dividing portion that rises with respect to the inclined surface and that increases in width in a direction perpendicular to the direction of inclination from an upstream side end toward a downstream side end.

6. The roof arrangement according to any of claims 1 to 5,

the furnace top hopper is provided with a movable plate control section for controlling the inclination angle of the movable plate before starting charging the raw material into the furnace top hopper or in the middle of a raw material charging step from the start of charging the raw material into the furnace top hopper to the end of charging.