CN113167535B

CN113167535B - Furnace top device

Info

Publication number: CN113167535B
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: 2024-01-16
Anticipated expiration: 2039-09-26
Also published as: KR102527177B1; JP7202860B2; KR20210053974A; CN113167535A; WO2020110444A1; JP2020085378A

Abstract

The present invention provides a furnace roof device (20), which comprises: a furnace roof hopper (22) provided with a charging port (50) at the upper part; a movable plate (40) which is provided outside the furnace roof hopper (22) above the inlet (50) and can move the position of the plate surface; and a first fixing plate (44) which is disposed in the furnace roof hopper (22) obliquely with respect to the horizontal plane. The furnace roof device (20) can control the falling position of the raw material in the furnace roof hopper (22) by swinging the movable plate (40).

Description

Furnace top device

Technical Field

The present disclosure relates to a stove top arrangement.

Background

The furnace top device includes a furnace top hopper having a plurality of center shafts arranged in an array around a furnace core and being eccentric with respect to the furnace core. Patent document 1 discloses the following technique: an upper baffle capable of adjusting an angle relative to the plumb line is arranged at the upper part in the furnace top hopper, and a lower baffle capable of adjusting an 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 roof hopper can be controlled by changing the angle of the upper baffle.

Prior art literature

Patent literature

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 roof hopper. Therefore, when a plurality of roof hoppers are arranged in an aligned manner, the position of the upper baffle driving device may interfere with other roof hoppers, other upper baffle driving devices, and the like.

Therefore, when the upper baffle is provided, a plurality of roof hoppers cannot be arranged. Further, in the case where a plurality of roof hoppers are disposed, the upper baffle cannot be provided.

The invention aims to provide a furnace top device capable of controlling the falling 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 problems, a stove top device according to one aspect of the present disclosure includes: a furnace top hopper provided with a charging port at the upper part; a movable plate which is provided above the charging port outside the furnace roof hopper and which can move the position of the plate surface; and a first fixing plate which is arranged obliquely relative to the horizontal plane in the furnace roof hopper.

The furnace top hopper may be provided with a plurality of switching slide grooves which are provided vertically above the furnace top hopper and which can switch the direction of the discharge port around the furnace core, and the movable plate may be provided between the discharge port of the switching slide grooves and the charging port of the furnace top hopper.

The first fixing plate may be inclined so that the core side end is vertically above the furnace outer side end, and a second fixing plate may be provided in the furnace roof hopper, the second fixing plate being provided at a position on the core side in the horizontal direction with respect to the first fixing plate and being inclined with respect to the horizontal plane.

A third fixing plate may be provided in the roof hopper, the third fixing plate being provided 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 diverting portion that rises with respect to the inclined surface and has a width in a direction perpendicular to the inclined direction that increases from the upstream side end toward the downstream side end.

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

The effects of the invention are as follows.

According to the present disclosure, even if a plurality of roof 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 a furnace roof device according to the present embodiment.

Fig. 2 is a partial enlarged view showing the roof 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 illustrating the operation of the furnace roof device when the size of particles of the discharged raw material is to be changed in the order of large particles, medium particles, and small particles with time.

Fig. 5 is an explanatory view illustrating the operation of the furnace roof device when the particle size of the discharged raw material is to be changed in the order of small particle, medium particle, and large particle with time.

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

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

Fig. 8 is a partially enlarged view of a furnace roof device according to a first modification of the structure for diverting raw materials around a furnace core.

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

Fig. 10 is an explanatory view for explaining an operation in the case where the raw material is dropped via the split portion.

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

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

Fig. 13 is a partial enlarged view of a roof apparatus according to a third modification.

Fig. 14 is a partial enlarged view of a roof apparatus according to a fourth modification.

Fig. 15 is a partial enlarged view of the stove top assembly with the piston rod pulled out to the maximum.

Fig. 16 is a partial enlarged view of the stove top assembly with the piston rod partially pulled out.

Detailed Description

Hereinafter, an embodiment of the present disclosure will be described in detail with reference to the accompanying drawings. The dimensions, materials, other specific numerical values, and the like shown in this embodiment are merely 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 functions and structures are denoted by the same reference numerals, and repetitive description of these elements is omitted, and illustration of elements not directly related to the present disclosure is omitted.

Fig. 1 is a schematic view of a vertical furnace system 1 including a furnace roof 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 the arrow of the broken line.

The vertical furnace system 1 includes a vertical furnace 10 and a furnace roof device 20. The furnace roof apparatus 20 includes a furnace roof hopper 22, a receiving hopper 24, a switching chute 26, a conveyor head pulley 28, a conveyor 30, a collection hopper 32, a vertical chute 34, a distribution chute (swing chute) 36, a distribution chute drive (swing chute drive) 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, for example, 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) roof hoppers 22 are arranged above the vertical furnace 10. The roof hopper 22 is a hollow vessel. Each of the roof hoppers 22 is arranged eccentrically with respect to the core of the vertical furnace 10. The furnace roof hoppers 22 are arranged at equal intervals (for example, at intervals of 120 degrees) around the furnace core. Regarding the roof hoppers 22 on the right side of fig. 1, one roof hopper 22 of the three is shown in cross-section. With respect to the left-hand roof hopper 22 of fig. 1, another roof hopper 22 of the three is shown in a side view.

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

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

The receiving hopper 24 is disposed vertically above the roof hopper 22. The receiving hopper 24 is formed hollow and is disposed substantially on the extension of the core. A plurality of (for example, three) lower opening portions 52 are formed in the lower portion of the receiving hopper 24 so as to open toward each of the roof hoppers 22. The lower opening portions 52 are formed at equal intervals (for example, at intervals of 120 degrees) around the core. The lower opening 52 is located vertically above the inlet 50 of the roof 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 port 54 that opens to the outside of the receiving hopper 24 vertically upward is formed at one end of the switching chute 26. A discharge port 56 that opens to the lower opening 52 of the receiving hopper 24 is formed at the other end of the switching chute 26.

The center of the receiving opening 54 is located on the extension of the core. The switching chute 26 is rotatable about a central axis passing through the center of the receiving port 54. That is, the switching chute 26 can switch the direction of the discharge port 56 around the core, whereby 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 baffle type or 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 separate manner from the receiving hopper 24.

The conveyor 30 carries the raw material M to be charged into the vertical furnace 10 to the conveyor head pulley 28. The conveyor head pulley 28 inputs the raw 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 (e.g., three) of roof hoppers 22. The furnace roof hopper 22 temporarily stores the raw material M fed through the switching chute 26.

The collection hopper 32 is disposed between the roof hopper 22 and the vertical furnace 10. The collection hopper 32 is formed in a hollow conical shape and is disposed substantially on the extension line of the furnace core. The lower portion of each roof hopper 22 is directed to the upper portion of the collection hopper 32.

The vertical chute 34 is formed in a hollow cylindrical shape and extends vertically downward of the collection 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 so that the furnace wall side is positioned vertically downward with respect to the core side (vertical chute 34 side).

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

The top hopper 22 discharges the stored raw material M to the collection hopper 32 at a predetermined timing. The collection hopper 32 discharges the raw material M supplied from the roof hopper 22 through the vertical chute 34 to the distribution chute 36. The distribution chute 36 rotates and tilts the raw material M supplied from the collection hopper 32, and loads the raw material M into the vertical furnace 10. The vertical furnace 10 reduces the charged raw material M to produce iron.

The movable plate 40 is provided outside the roof hopper 22 above (vertically above) the inlet 50 of the roof hopper 22. Specifically, the movable plate 40 is disposed within the receiving hopper 24. The movable plate 40 can swing around 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 plate control unit 42 is constituted by a semiconductor integrated circuit including a Central Processing Unit (CPU), a ROM in which a program and the like are stored, a RAM as a work area, and the like. The movable plate control unit 42 swings (rotates) the movable plate 40 according to the method of depositing the raw material M in the roof hopper 22, thereby controlling the inclination angle of the movable plate 40.

The movable plate control unit 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 course of the raw material charging process from the start of charging the raw material M into the top hopper 22 to the end of charging.

The first, second and third fixing plates 44, 46, 48 are formed in a plate shape and are provided in the roof hopper 22. The first fixing plate 44, the second fixing plate 46, and the third fixing plate 48 are located above the center position in the vertical direction in the roof hopper 22. The first fixing plate 44, the second fixing plate 46, and the third fixing plate 48 are arranged in the horizontal direction. The first, second and third fixing plates 44, 46, 48 are inclined with respect to the horizontal plane and are fixed to the roof hopper 22. Hereinafter, the first fixing plate 44, the second fixing plate 46, and the third fixing plate 48 are sometimes collectively referred to as fixing plates.

The movable plate 40, the first fixed plate 44, the second fixed plate 46, and the third fixed plate 48 function as control plates for controlling the falling position (stacking position) of the raw material M in the roof hopper 22.

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

The roof 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 vertical direction of the cylindrical portion 60. The inlet 50 is formed in an upper portion of the cylindrical portion 60. The charging port 50 is located on the core side with respect to the central axis (single-dot chain line C2) of the roof 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 decreases toward the vertical direction. A roof hopper discharge outlet 66 for communicating the inside and outside of the roof hopper 22 is provided at the lower part of the conical part 62. The roof hopper discharge outlet 66 is located on the core side with respect to the central axis of the roof hopper 22. A shutter 68 for opening and closing the roof hopper discharge port 66 is provided in the roof hopper discharge port 66.

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

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

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

The third fixing plate 48 is located between the first fixing plate 44 and the second fixing plate 46. The position of the third fixing plate 48 in the vertical direction is substantially equal to the positions of the first fixing plate 44 and the second fixing plate 46 in the vertical direction. The 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 on the core side with respect to the center axis of the roof hopper 22. The furnace outer end of the third fixing plate 48 is located relatively close to the central axis of the roof 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 than the core-side end of the third fixing plate 48.

The inclination angle of the third fixing plate 48 is changed in the middle of the third inclined surface 48 a. This is to adjust the position of the core side end, the position of the furnace outside end, and the inclination direction of the third inclined surface 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 core side end to the outer side end.

In the conventional furnace roof apparatus, the falling position of the raw material M in the furnace roof hopper 22 is controlled by moving a control plate (for example, an upper baffle plate) in the furnace roof hopper 22. In this embodiment, a driving device for moving a control plate in the roof hopper 22 is required to be provided outside the side surface of the roof hopper 22. Therefore, when a plurality of roof hoppers 22 are arranged in an aligned manner, the position of the drive device of the control board may interfere with other roof hoppers 22, other drive devices, and the like.

As a result, the control of the falling position of the raw material M in the furnace roof hoppers 22 and the arrangement of a plurality of furnace roof hoppers 22 at the same time cannot be achieved by applying the conventional technique.

In contrast, in the roof apparatus 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 roof hopper 22. In this way, in the roof apparatus 20 of the present embodiment, it is not necessary to provide a driving device for moving the control plate in the roof hopper 22 outside the side surface of the roof hopper 22.

Therefore, in the furnace roof apparatus 20 of the present embodiment, a plurality of furnace roof hoppers 22 can be arranged in an aligned manner. In the furnace roof apparatus 20 of the present embodiment, the movable plate 40 in the receiving hopper 24 is moved to control the falling position of the raw material M in the furnace roof hopper 22.

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. A lid 72 for opening and closing the upper opening 70 is provided in the upper opening 70.

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

The movable plate 40 is located outside the furnace with respect to the discharge port 56. The movable plate 40 is located above the lower opening 52 located above the inlet 50. The movable plate 40 is positioned below the uppermost portion of the discharge port 56. That is, the movable plate 40 is located between the discharge port 56 of the switching chute 26 and the charging port 50 of the roof 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 falling path of the raw material M falling from the discharge port 56 to the inlet 50.

The movable plate 40 includes a rotation shaft 80, a base portion 82, and a plate portion 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 rotation shaft 80 is supported by the receiving hopper 24. The rotation shaft 80 is rotatable about its center axis. The rotation shaft 80 is located above the lowest part of the discharge port 56 of the switching chute 26.

Here, pressure is applied within the roof hopper 22. Therefore, in the conventional stove top device in which the movable control plate is located in the stove top hopper 22, it is necessary to seal the rotary shaft that moves the control plate with air or the like, and the structure of the rotary shaft becomes complicated.

In contrast, the pressure in the receiving hopper 24 may not be applied. Therefore, in the roof apparatus 20 of the present embodiment, it is not necessary to seal the rotary shaft 80 with gas or the like, and the structure of the rotary shaft 80 can be simplified.

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

As shown by arrow A1 in fig. 2, the base portion 82 and the plate portion 84 can swing around the rotation shaft 80 with rotation of the rotation shaft 80. 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 with respect to the horizontal plane (the inclination angle of the movable plate 40) can be set by swinging the base portion 82 and the plate portion 84.

In the furnace roof apparatus 20 of the present embodiment, the falling path of the raw material M charged into the furnace roof 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 roof apparatus 20 of the present embodiment, by controlling the inclination angle of the movable plate 40, the fixed plate through which the raw material M falls can be selected 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 lower opening portions 52. That is, the movable plate 40 is provided for each of the roof hoppers 22.

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

A movable plate driving portion 88 is provided at one end of the rotation shaft 80. The movable plate driving portion 88 includes, for example, a lever extending radially from the rotation shaft 80 and a driver tilting the lever around the rotation 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 to the outside of the furnace with respect to the center axis of the roof hopper 22, the length of the control plate in the roof hopper 22 increases. In the conventional furnace roof apparatus for moving the control plate in the furnace roof hopper 22, a large torque is required to move the control plate having a long length, and the size of the drive device for moving the control plate is increased.

In contrast, the movable plate 40 in the present embodiment has a smaller size (see fig. 2) than the control plate (e.g., the first fixed plate 44) in the roof hopper 22. Therefore, in the roof apparatus 20 of the present embodiment, the torque for moving the movable plate 40 is smaller than in the conventional roof apparatus. Therefore, in the roof apparatus 20 of the present embodiment, the size of the movable plate driving section 88 can be reduced.

As a result, in the roof apparatus 20 of the present embodiment, interference between the installation position of the movable plate driving unit 88 and other devices such as other movable plate driving units 88 can be avoided.

The movable plate 40 is provided with a position detecting unit 90 that detects the position (i.e., the inclination angle) of the movable plate 40. The position detecting unit 90 is, for example, an absolute encoder. The position detecting section 90 is provided at the movable plate driving section 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 detecting unit 90 detects the rotation angle of the rotation shaft 80. The movable plate control unit 42 obtains the rotation angle of the rotation shaft 80 from the position detection unit 90, and derives the position of the movable plate 40. The movable plate control unit 42 operates the movable plate driving unit 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 device 20 according to the present embodiment will be described. In the furnace roof apparatus 20 of the present embodiment, when the raw material M is discharged from the furnace roof hopper 22, the inclination angle of the movable plate 40 is set according to the change in the particle size of the discharged raw material M with the passage of the discharge time. 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 over time in the order of large particles, medium particles, and 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, and large particles. In the third mode, the particle size 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 furnace roof device 20 when the size of the particles of the discharged raw material M is to be changed in time in the order of large particles, medium particles, and 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 with a two-dot chain line.

When the raw material M is to be discharged in the order of large grains, medium grains, and small grains, the movable plate 40 is swung outside the furnace in the furnace top device 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 located vertically below the rotary shaft 80 and outside the furnace. The plate surface 86 of the movable plate 40 is retracted outside 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 falls down in a parabolic manner toward the lower opening 52 of the receiving hopper 24 and the charging port 50 of the roof hopper 22. At this time, since the plate surface 86 is retracted toward the outermost side of the furnace, the raw material M directly passes through the lower opening 52 and the inlet 50 without contacting the plate surface 86.

Then, the raw material M falls down in the roof hopper 22 to the vicinity of the upper end of the first inclined surface 44a of the first fixing plate 44. The raw material M that falls onto the first fixing plate 44 slides down the first inclined surface 44a, and falls down freely in a parabolic shape from the lower end of the first inclined surface 44 a. Thus, the raw material M falls to the outside of the central axis of the furnace roof hopper 22, and is deposited in a mountain shape with its falling position as a vertex.

Here, relatively small (powdery) raw material M is accumulated near the top of the mountain. On the other hand, relatively large-sized (block-shaped) raw materials M slide down the slope of the mountain and are deposited near the feet 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 roof hopper 22, large-sized raw materials M are stacked on the side of the furnace center with respect to the central axis of the furnace roof hopper 22. In addition, relatively small-sized raw materials M are deposited outside the furnace with respect to the central axis of the furnace roof hopper 22. That is, in this case, the ratio of large particles per horizontal cross-sectional area in the roof hopper 22 is large and the ratio of small particles is small in the vicinity of the roof hopper discharge port 66. Further, the smaller the ratio of large particles from the vicinity of the roof hopper discharge port 66 to the vertically upper side, the larger the ratio of small particles.

After that, when the gate 68 of the roof hopper 22 is opened, the raw material M in the roof hopper 22 is discharged vertically downward from the roof 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. Thus, as the discharge time passes, the raw material M is discharged in the order of large grains, medium grains, and small grains.

Therefore, when the discharge in the order of large grains, medium grains, and small grains is desired, the movable plate control unit 42 is caused to control the swing of the movable plate 40 in advance so that the inclination angle of the movable plate 40 becomes the first inclination angle before the start of the charging of the raw material M into the roof hopper 22.

Fig. 5 is an explanatory view for explaining the operation of the furnace roof device 20 when 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, and 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 to be discharged in the order of small grains, medium grains, and large grains, the movable plate 40 is swung toward the furnace center in the furnace top device 20. In this case, the movable plate 40 is inclined at an angle (second inclination angle) such that the tip of the plate portion 84 is located below the rotary shaft 80 and on the core side. The plate surface 86 of the movable plate 40 advances toward the core.

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

Then, the raw material M falls down in the roof hopper 22 to the vicinity of the upper end of the second inclined surface 46a of the second fixing plate 46. The material M that has fallen onto the second fixing plate 46 slides down on the second inclined surface 46a, and falls down from the lower end of the second inclined surface 46a in a parabolic shape. Thus, the raw material M falls down toward the center of the center axis of the furnace roof hopper 22, and is deposited in a mountain shape with its falling position as a vertex.

As shown in fig. 5, when the top of the mountain is located on the core side from the central axis of the roof hopper 22, relatively small-sized raw materials M are stacked on the core side with respect to the central axis of the roof hopper 22. In addition, relatively large-sized raw material M is deposited on the outside of the furnace with respect to the central axis of the furnace roof hopper 22. That is, in this case, the ratio of large particles per horizontal cross-sectional area in the roof hopper 22 is small and the ratio of small particles is large near the roof hopper discharge outlet 66. Further, the larger the ratio of large particles is, the smaller the ratio of small particles is, as the furnace roof hopper discharge outlet 66 is directed vertically upward.

After that, when the gate 68 of the roof hopper 22 is opened, the raw material M in the roof hopper 22 is discharged vertically downward from the roof 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. Thus, the raw material M is discharged in the order of small grains, medium grains, and large grains as the discharge time elapses.

Therefore, when the discharge in the order of small grains, medium grains, and large grains is desired, the movable plate control unit 42 is caused to control the swing of the movable plate 40 in advance so that the inclination angle of the movable plate 40 becomes the second inclination angle before the start of the charging of the raw material M into the roof hopper 22.

Fig. 6 is an explanatory view for explaining the operation of the furnace roof device 20 in the case where the particle size of the discharged raw material M is to be kept constant irrespective 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.

When the particle size of the raw material M is to be kept constant, the movable plate 40 is swung to a position substantially in the middle of the swing range in the furnace roof device 20. That is, the movable plate 40 is located between a position at the first inclination angle and a position at the second inclination angle. In this case, the movable plate 40 is positioned on the furnace center side with respect to the first inclination angle and on the outside with respect to the second inclination angle (third inclination angle) at the front end of the plate portion 84. The plate surface 86 of the movable plate 40 is advanced toward the core side at the first inclination angle and retreated toward the outside 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 falls down in a parabolic shape. At this time, since the plate surface 86 extends toward the middle of the falling path of the raw material M, the raw material M hits the plate surface 86 at the middle of the falling path. Thereby, the falling direction of the raw material M is changed by the movable plate 40. Further, since the plate surface 86 is retreated toward the outside of the furnace than at the second inclination angle, the changed falling direction is a direction toward the outside of the furnace than at the second inclination angle and toward the core side than at the first inclination angle.

Then, the raw material M falls down in the roof hopper 22 to the vicinity of the upper end of the third inclined surface 48a of the third fixing plate 48. The material M that has fallen onto the third fixing plate 48 slides down on the third inclined surface 48a and falls down from the lower end of the third inclined surface 48a in a parabolic shape. Thus, the raw material M falls down near the central axis of the roof hopper 22, and is deposited in a mountain shape with its falling position as a vertex.

As shown in fig. 6, when the top of the mountain is located near the central axis of the top hopper 22, small-sized raw materials are relatively stacked near the central axis of the top hopper 22. The large-sized raw material M is relatively deposited on the side of the center of the furnace roof hopper 22 and on the outside of the furnace. That is, in this case, the ratio of large particles and the ratio of small particles per horizontal cross-sectional area in the roof hopper 22 are substantially constant from the roof hopper discharge outlet 66 to the vertically upper side.

After that, when the gate 68 of the roof hopper 22 is opened, the raw material M in the roof hopper 22 is discharged vertically downward from the roof 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. Thus, 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 kept constant, the movable plate control unit 42 is caused to control the swing of the movable plate 40 so that the inclination angle of the movable plate 40 becomes the third inclination angle in advance before starting the charging of the raw material M into the top hopper 22.

When the size of the particles of the discharged raw material M is to be kept constant, the method is not limited to a method in which the inclination angle of the movable plate 40 is set to the third inclination angle before the start of the charging of the raw material M. For example, the size of the particles of the discharged raw material M may be made constant by changing the inclination angle of the movable plate 40 during the raw material charging process from the start of charging the raw material M to the end of charging.

Fig. 7 is an explanatory view for explaining the operation of the furnace roof device 20 in the case where the inclination angle of the movable plate 40 is changed in the middle of the raw material charging process. 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 with a two-dot chain line.

The movable plate control unit 42 sequentially changes the inclination angle of the movable plate 40 every time a predetermined time elapses in the raw material charging process. Specifically, before the start of the charging of the raw material M, the movable plate control unit 42 sets the inclination angle of the movable plate 40 to the second inclination angle in advance. When the raw material M starts to be charged in this state, the raw material M falls to the side of the center axis of the furnace roof hopper 22 via the movable plate 40 and the second fixed plate 46.

When a predetermined time has elapsed since the raw material M was put in, the movable plate control unit 42 changes the inclination angle of the movable plate 40 to the third inclination angle. Then, the raw material M falls down to the vicinity of the central axis of the roof hopper 22 via the movable plate 40 and the third fixed plate 48.

After that, when a predetermined time elapses, the movable plate control unit 42 changes the inclination angle of the movable plate 40 to the first inclination angle. Then, the raw material M falls to the outside of the furnace of the central shaft of the roof hopper 22 via the first fixing plate 44.

When a predetermined time has elapsed in the state of the first inclination angle, the movable plate control unit 42 changes the inclination angle of the movable plate 40 to the third inclination angle. Then, the raw material M falls down to the vicinity of the central axis of the roof hopper 22 via the movable plate 40 and the third fixed plate 48.

After that, when the predetermined time elapses, the movable plate control unit 42 changes the inclination angle of the movable plate 40 to the second inclination angle. Then, the raw material M falls down to a position on the core side of the center axis of the roof hopper 22 via the movable plate 40 and the second fixed plate 46.

In this way, the movable plate control unit 42 repeats the swinging of the movable plate 40 every predetermined time elapses until the raw material charging process is completed.

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

The predetermined time for changing the inclination angle of the movable plate 40 is set such that, for example, a period for maintaining the first inclination angle, a period for maintaining the second inclination angle, and a period for maintaining the third inclination angle are equal to each other in the raw material charging process.

In the raw material charging step, the weight of the raw material M in the top hopper 22 increases. Therefore, a measuring unit 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 roof apparatus 20 of the present embodiment, the movable plate 40 is provided outside the furnace roof hopper 22 and above the charging port 50, and the first fixed plate 44, the second fixed plate 46, and the third fixed plate 48 are provided in the furnace roof hopper 22. In the roof apparatus 20 of the present embodiment, the movable plate 40 is swung (the position of the plate surface 86 is moved), whereby the fixed plate on which the raw material M falls can be selected.

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

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

In addition, in the roof apparatus 20 of the present embodiment, since the movable plate 40 is provided outside the roof hopper 22, maintenance of the movable plate 40 can be easily performed as compared with a case where a movable control plate is provided inside the roof hopper 22.

In the stove 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 stove top hopper 22. Therefore, in the furnace roof apparatus 20 according to the present embodiment, the raw material M can be accurately dropped to the target drop position.

In the furnace roof apparatus 20 of the present embodiment, the inclination angle of the movable plate 40 can be controlled before the start of the raw material M feeding or during the raw material feeding process. Therefore, in the furnace roof apparatus 20 of the present embodiment, the falling position of the raw material M can be more reliably controlled.

In the present embodiment, the first, second, and third fixing plates 44, 46, and 48 are provided in the roof hopper 22. However, the first fixing plate 44, the second fixing plate 46, and the third fixing plate 48 are not limited to the manner in which they are all provided in the roof hopper 22. In the roof apparatus 20, at least the first fixing plate 44 may be provided in the roof hopper 22, and the second fixing plate 46 and the third fixing plate may be omitted. In this case, the furnace roof apparatus 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 roof hopper 22 can be controlled.

In the stove top assembly 20, the first fixing plate 44 and the second fixing plate 46 may be provided in the stove top hopper 22, and the third fixing plate 48 may be omitted. In this case, the second fixing plate 46 may be inclined such that the core side end is located vertically downward. In this embodiment, the falling position of the raw material M in the roof hopper 22 can 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 drop the raw material M in a divided manner around the center axis of the roof hopper 22.

Fig. 8 is a partially enlarged view of a furnace roof device 120 according to a first modification of the structure for diverting the raw material M around the furnace core. The roof apparatus 120 differs from the roof apparatus 20 in that the third fixing plate 48 is provided with a split portion 122. The diverting portion 122 is provided to stand up with respect to 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 seen from the direction of the hollow arrow IX in fig. 8. The split portion 122 is formed in a triangular shape in which the width perpendicular to the inclination direction of the third inclined surface 48a increases from the upstream side end (the core side end) toward the downstream side end (the furnace outside end) of the third fixing plate 48. The top 122a on the upstream side of the flow dividing portion 122 is located at the widthwise center of the third fixing plate 48. The diverting portion 122 has: a downstream side end is located at a slope 122b on one side (left side in fig. 9) of the third fixing plate 48 in the width direction; and a slope 122c whose downstream side end is located on the other side (right side in fig. 9) of the third fixing plate 48 in the width direction.

When the raw material M is dropped onto the third fixing plate 48 of the furnace top device 120, the raw material M is branched by the branching portion 122 in the width direction of the third fixing plate 48 when the raw material M slides off from the top 122a of the branching portion 122 toward the downstream side end on the third inclined surface 48 a. Then, substantially half of the raw material M slides down the third inclined surface 48a and the inclined surface 122b to fall 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 to fall into the top hopper 22.

Fig. 10 is an explanatory view for explaining the operation in the case where the raw material M is dropped via the diversion section 122. In fig. 10, the height of the deposited raw material M is indicated by a contour line. Hereinafter, a plane passing through the center axis of the roof hopper 22 and the core is referred to as a reference plane. In fig. 10, a reference plane is indicated by a one-dot chain line C3.

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

In this way, in the furnace roof device 120, the number of mountains of the raw material M is larger than that of the system in which the diversion portion 122 is not provided. Therefore, in the roof apparatus 120, the ratio of large grains and the ratio of small grains per horizontal cross-sectional area in the roof hopper 22 can be made more constant.

In addition, the movable plate control unit 42 of the furnace roof device 120 may sequentially change the inclination angle of the movable plate 40 every time a predetermined time elapses in the raw material charging process.

Fig. 11 is an explanatory view for explaining an operation in a case where the inclination angle of the movable plate 40 is sequentially changed in the roof apparatus 120 having the shunt portion 122. In fig. 11, the height of the deposited raw material M is indicated by a contour line.

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

(second modification)

Fig. 12 is a partial enlarged view of a roof apparatus 220 according to a second modification. The roof arrangement 220 differs from the roof arrangement 20 in that a second fixing plate 246 is provided instead of the second fixing plate 46.

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

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

Accordingly, in the furnace roof apparatus 220, similarly to 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 grains, medium grains, and large grains when the raw material M is discharged from the furnace roof hopper 22.

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

(third modification)

Fig. 13 is a partial enlarged view of a roof apparatus 320 according to a third modification. The roof apparatus 320 is different from the roof apparatus 20 in that a movable plate 340 is provided in place of the movable plate 40. In the roof apparatus 320, the upper opening 70 and the cover 72 of the receiving hopper 24 are provided on the side surfaces 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 an 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. The base portion 383 is connected to the second arm 382. The plate 384 is coupled to the base 383 such that the plate 386 faces the core with respect to the plate 384.

In addition, a driver 387 is provided in the roof apparatus 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 with respect to the cylinder 388.

When the piston rod 389 is pulled into the cylinder 388, the plate 384 swings outward about the rotation shaft 380. When the piston rod 389 is pulled out of the cylinder 388, the plate 384 swings toward the core around the rotation shaft 380. That is, the plate 384 can swing around the rotation shaft 380 as indicated by a double arrow a31 in fig. 13.

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

(fourth modification)

Fig. 14 is a partial enlarged view of a roof apparatus 420 according to a fourth modification. The roof apparatus 420 differs from the roof apparatus 20 in that a movable plate 440 is provided in place of the movable plate 40.

The movable plate 440 includes a plate portion 480. The plate portion 480 has a second plate surface 482 and a third plate surface 483 facing the core side. The second plate surface 482 is positioned above the third plate surface 483. The second plate surface 482 is inclined such that the lower end is located closer to the core than the upper end. The third plate surface 483 is inclined such that the lower end is positioned outside the furnace as compared with the upper end. That is, the inclination angle of the second plate surface 482 is different from that of the third plate surface 483.

Further, a driver 487 is provided in the furnace roof device 420. Driver 487 includes a cylinder 488 and a piston rod 489. One end of piston rod 489 is inserted into cylinder 488, and the other end is coupled to plate 480. Actuator 487 is disposed such that piston rod 489 extends in the vertical direction. Movable plate control unit 42 slides piston rod 489 with respect to cylinder 488.

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

In fig. 14, piston rod 489 is shown pulled in to its maximum extent. 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 piston rod 489 is pulled in to the maximum extent, plate 480 is separated from the falling path of raw material M falling from discharge port 56 to inlet port 50. In this case, the raw material M falls into the roof hopper 22 via the first fixing plate 44.

Fig. 15 is a partial enlarged view of stove top assembly 420 with piston rod 489 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 with a two-dot chain line.

When piston rod 489 is pulled out to the maximum, plate 480 enters the path along which raw material M falls from discharge port 56 to inlet port 50, and second plate surface 482 is positioned midway along the path along which raw material M falls. Accordingly, 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 falls into the roof hopper 22 via the second fixing plate 46.

Fig. 16 is a partial enlarged view of stove top assembly 420 with a portion of piston rod 489 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 with a two-dot chain line.

When piston rod 489 is partially pulled out, plate 480 enters the falling path of raw material M falling from discharge port 56 to inlet port 50, and third plate surface 483 is positioned midway along the falling path of raw material M. Accordingly, the raw material M hits the third plate surface 483 in the middle of the falling path, and the falling direction is changed. In this case, the raw material M falls into the roof hopper 22 via 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 roof apparatus 420, the second plate surface 482 and the third plate surface 483 move in the vertical direction. In the furnace roof apparatus 420, the second plate surface 482 and the third plate surface 483 are moved, whereby a fixed plate for dropping the raw material M can be selected.

Therefore, in the furnace roof apparatus 420, as in the above-described embodiment, even if a plurality of furnace roof hoppers 22 are arranged, the falling position of the raw material M in the furnace roof 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, so that 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 that various modifications and modifications can be made by those skilled in the art within the scope of the present disclosure, and these modifications and modifications are of course within the technical scope of the present disclosure.

For example, the movable plate 40 may be configured to be slidable in the radial direction of the rotation shaft 80 with respect to the base portion 82. For example, the movable plate 40 may be configured such that the plate 84 is retracted radially inward of the rotary shaft 80 when the movable plate swings in the outward direction, and such that the plate 84 is advanced radially outward of the rotary shaft 80 when the movable plate swings in the core direction. According to this aspect, the degree of contact between the raw 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 utilized in a roof arrangement.

Description of symbols

20. 120, 220, 320, 420-roof arrangement, 22-roof hopper, 26-switching chute, 40, 340, 440-movable plate, 42-movable plate control section, 44-first fixed plate, 46, 246-second fixed plate, 48-third fixed plate, 50-inlet, 56-outlet, 122-diverter section.

Claims

1. A furnace roof apparatus, comprising:

a plurality of furnace top hoppers arranged around a furnace core and provided with charging ports at the upper part;

a movable plate which is provided above the charging port outside the furnace roof hopper and is capable of moving the position of the plate surface; and

a first fixing plate which is arranged obliquely relative to the horizontal plane in the furnace roof hopper,

the furnace roof device is configured to be able to select whether or not to drop the raw material charged into the furnace roof hopper to the first fixed plate by moving the position of the plate surface of the movable plate.

2. The roof arrangement according to claim 1, wherein,

a switching chute is arranged above the furnace top hopper, the switching chute can switch the direction of the discharge port around the furnace core,

The movable plate is provided between the discharge port of the switching chute and the charging port of the roof hopper.

3. The stove top arrangement according to claim 1 or 2, characterized in that,

the first fixing plate is inclined in such a manner that the side end of the furnace core is located vertically above the outer end of the furnace,

the furnace roof hopper is also provided with a second fixing plate which is arranged on the side of the furnace core in the horizontal direction compared with the first fixing plate and is inclined relative to the horizontal plane,

the furnace roof device is configured to be able to select a fixed plate from the first fixed plate and the second fixed plate, in which the raw material falls, by moving the position of the plate surface of the movable plate.

4. A roof arrangement according to claim 3, wherein,

the furnace roof hopper is also provided with a third fixed plate which is positioned between the first fixed plate and the second fixed plate and is arranged obliquely relative to the horizontal plane,

the furnace roof device is configured to be able to select a fixed plate from the first fixed plate, the second fixed plate, and the third fixed plate by moving the position of the plate surface of the movable plate.

5. The furnace roof apparatus according to claim 4, wherein,

the third fixing plate has a branching portion provided to stand up with respect to an inclined surface provided in the third fixing plate, and a width in a direction perpendicular to a normal line direction of the inclined surface and a direction perpendicular to an inclined direction increases from an upstream side end toward a downstream side end.

6. The roof arrangement according to claim 1, wherein,

the apparatus further comprises a movable plate control unit for controlling the inclination angle of the movable plate before starting the raw material charging into the top hopper or during a raw material charging process from the start of raw material charging into the top hopper to the end of raw material charging.