TWI803107B - Furnace top device - Google Patents

Abstract

A furnace top device 1 is provided with a conveyor belt head cover 22 surrounding the raw material input side end of the conveyor belt 20, a switching chute 14 that has an inlet 52 facing an outlet 62 of the conveyor belt head cover 22 and is rotatable around the central axis 56 of the inlet 52, a plurality of furnace top bunkers 10 arranged around the periphery of the furnace core at the vertical lower side of the switching chute 14, and a movable part 70 movably disposed within the conveyor belt head cover 22. The movable part 70 may be arranged at an intermediate position of the positions where at least a part of the raw material falling from the conveyor belt 20 collides.

Description

stove top unit

The present invention relates to a furnace top installation. This application claims the benefit of priority based on Japanese Patent Application No. 2020-214036 filed on December 23, 2020, and the content thereof is incorporated herein by reference.

For example, Patent Document 1 discloses an example of a furnace top device. In this furnace top device, a plurality of furnace top hoppers are arranged in a row around the furnace core, and the furnace top chute to receive raw material input is switched by switching the chute.

[Prior technical literature]

[Patent Document 1: Patent Document]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2016-17197

When feeding raw materials into the furnace roof chute through the switching chute, sometimes the raw material is fed to a position deviated from the desired charging position in the furnace top chute due to the direction of the switching chute.

The object of the present invention is to provide a furnace top device, which can accurately put raw materials into the desired position in the furnace top chute regardless of the direction of the switching chute.

In order to solve the above-mentioned problems, a furnace roof device according to an aspect of the present invention is provided with: a conveyor belt cover that surrounds the raw material input side end of the conveyor belt; a switching chute that has a receiving port facing the discharge port of the conveyor belt cover, and It may be able to rotate around the central axis of the receiving port; a plurality of furnace top troughs are arranged around the furnace core on the vertically lower side of the switching chute; and the movable part is movably arranged in the conveyor belt head cover; and the movable The part may be disposed at an intermediate position between positions hit by at least a part of the material falling from the conveyor belt.

In addition, the movable part can move to a retracted position outside the area where materials falling from the conveyor belt exist, and the inclination angle of the bottom surface of the movable part with respect to the horizontal plane at the retracted position is larger than that of the movable part at the intermediate position. The angle of inclination of the bottom face relative to the horizontal plane.

In addition, the furnace roof device may further include a fixed part that is fixedly arranged on the opposite side of the retracted position relative to the area where the raw materials falling from the conveyor belt are located; and the movable part can move to form a receiving container together with the fixed part. receiving location.

In addition, the furnace roof device may further include: a raw material detection unit that detects the end of the raw material to be fed from the conveyor belt; To detect the end of the raw material, the movable part moves from the intermediate position to the retracted position, and then moves to the receiving position.

In addition, the furnace roof device may set the rotation angle of the switching chute to a rotation angle corrected in the direction of the movable part around the periphery of the furnace core relative to the reference angle based on the arrangement of the furnace top chute.

According to the present disclosure, regardless of the direction of the switching chute, the raw material can be accurately put into the desired position in the furnace top chute.

1: furnace top device

10, 10A, 10B, 10C: top hopper

12: Receiving hopper

14: Switch chute

16:Switch chute driving device

18: Conveyor head pulley

20: conveyor belt

22: Conveyor belt hood

24: Raw material testing department

26: Raw material input adjustment device

28: Movable part driving device

30: Prevent excessive accumulation of sensors

32: Control Department

40: Raw material input port

42: Upper closing valve

44: valve seat

46: valve body

50: Lower opening

52: Receiving port

54: send exit

56: Central axis

60: opening

62: export

64: top surface

66: Bevel

70: Movable part

72: fixed part

74: Driving mechanism

80: fixed support

82: vertical part

84: inclined part

86: end face

90: back face

92: Bottom face

94: side face

96: protrusion

98: protrusion

100: drive shaft

102: drive arm

104: Drive link

106: Driven shaft support part

108: driven shaft

110: Slave arm

112: Driven connection part

114: Rear

120B: a little chain line

120C: a little chain wire

122B: A little chain line

122C: A little chain wire

124B: Arrow

124C: Arrow

A: Furnace top device

B10: Arrow

B12: Arrow

Fig. 1 is a schematic cross-sectional view showing the configuration of a furnace roof apparatus according to a first embodiment.

Fig. 2 is a schematic perspective top view of the conveyor belt hood seen from vertically above when the movable part is in the middle position.

Fig. 3 is a schematic cross-sectional view showing the structure of the furnace roof apparatus when the movable part is located at the retracted position.

Fig. 4 is a schematic cross-sectional view showing the structure of the furnace roof apparatus when the movable part is located at the receiving position.

Fig. 5 is a schematic perspective top view of the conveyor belt hood seen from vertically above when the movable part is at the receiving position.

Fig. 6 is a diagram illustrating a furnace top device of a comparative example in which a raw material input adjustment device is not installed.

Fig. 7 is a diagram illustrating a furnace top device of a comparative example in which a raw material input adjustment device is not installed.

Fig. 8 is a diagram illustrating the function and function of the furnace top device 1 of the present embodiment.

Fig. 9 is a schematic plan view illustrating the setting of the rotation angle of the switching chute.

An embodiment of the present invention will be described in detail below with reference to the drawings. The dimensions, materials, and other specific numerical values shown in this embodiment are only examples for easy understanding, and are not intended to limit the present disclosure unless otherwise specified. In addition, in this specification and drawings, elements having substantially the same functions and configurations are assigned the same reference numerals, and repeated explanations are omitted, and illustration of elements not directly related to the present disclosure is omitted.

Fig. 1 is a schematic cross-sectional view showing the configuration of a furnace roof apparatus 1 according to a first embodiment. The furnace top device 1 is installed vertically above the vertical furnace for feeding raw materials into the vertical furnace. The vertical furnace may be, for example, a blast furnace for producing iron from raw materials such as iron ore and coke, and may be any furnace.

Furnace top device 1 includes furnace top chute 10, receiving hopper 12, switching chute 14, switching chute driving device 16, conveyor belt head pulley 18, conveyor belt 20, conveyor belt head cover 22, raw material detection part 24, raw material input adjustment Device 26 , movable part drive device 28 , excessive accumulation prevention sensor 30 and control part 32 .

Furnace top hopper 10 is a hollow container. A plurality of (for example, three) top hoppers 10 are arranged, for example, vertically above the vertical furnace. FIG. 1 is an example of a furnace top chute 10 among a plurality of furnace top hoppers 10 . The furnace top chute 10 is arranged eccentrically with respect to the hearth of the vertical furnace. Furnace top hoppers 10 are arranged at equal intervals around the furnace core. For example, when the number of furnace top hoppers 10 is three, the furnace top hoppers 10 are arranged around the furnace core at intervals of 120 degrees. Furthermore, the number of furnace top hoppers 10 is not limited to three, but may be two or four.

A raw material inlet 40 that communicates the inside and outside of the top chute 10 is formed on the upper portion of the top chute 10 . The raw materials are put into the furnace top hopper 10 through the raw material inlet 40, which will be described in detail later. Furnace top feed chute 10 can store the input raw material.

The raw material input port 40 of the top chute 10 is provided with an upper closing valve 42 . The upper closing valve 42 includes a valve seat 44 formed at the end of the raw material inlet 40 and a valve body 46 that opens and closes with respect to the valve seat 44 . The upper closing valve 42 opens and closes the raw material input port 40 , and closes the raw material input port 40 between the valve seat 44 and the valve body 46 when closing the raw material input port 40 .

The lower part of the top chute 10 is formed with a raw material discharge port that communicates with the inside and outside of the top chute 10, but the illustration is omitted here. The raw material outlet of furnace top hopper 10 is provided with a flow adjustment gate and a lower closing valve. The flow adjustment gate is used to block the discharge of raw materials when closing the raw material discharge port. The lower closed valve system blocks the The flow of gas through the raw material discharge port. If the flow adjustment gate and the lower closing valve are opened at a predetermined timing, the raw materials in the furnace top chute 10 will be put into the vertical furnace through the raw material discharge port.

The receiving hopper 12 is arranged vertically above the plurality of furnace top hoppers 10 arranged in line. The receiving hopper 12 is formed hollow, and is arranged such that its central axis substantially overlaps the furnace core. Here, a part of the receiving hopper is omitted in FIG. 1 . The lower part of the receiving hopper 12 is formed with the lower opening part 50 corresponding to the number of the top hoppers 10 . The respective lower openings 50 are respectively opened toward the raw material inlets 40 of the respective furnace top hoppers 10 .

The switching chute 14 is arranged on the upper part of the receiving hopper 12 . The switching chute 14 is formed in a curved cylindrical shape communicating with the inside and outside of the receiving hopper 12 . One end of the switching chute 14 is formed as a receiving port 52 that opens to the outside of the receiving hopper 12 facing vertically upward. The other end of the switching chute 14 is formed as a delivery port 54 that opens toward the lower opening 50 .

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

The switch chute driving device 16 makes the switch chute 14 rotate. The switching chute driving device 16 can be a hydraulic device or an electric device. In addition, the switch chute driving device 16 has a switch chute position detection unit that detects the rotation angle of the switch chute 14 (in other words, the rotation position of the switch chute).

The conveyor head pulley 18 is located obliquely above the central axis 56 of the receiving port 52 radially offset. The conveyor belt 20 is connected to the conveyor head pulley 18 . The conveyor belt 20 is extended from the conveyor head pulley 18 toward the direction away from the furnace core. The conveyor belt 20 is tilted with respect to the horizontal plane and deviates vertically downward as it moves away from the conveyor head pulley 18 .

A predetermined amount of raw material is placed on the conveyor belt 20 at the inclined lower end side of the conveyor belt 20 . The conveyor belt 20 conveys the material placed on the conveyor belt 20 to the side of the conveyor head pulley 18 on the inclined upper end side. At this time, a predetermined amount of raw material is continuously conveyed in batches along the longitudinal direction of the conveyor belt 20 . The raw material conveyed to the conveyor head pulley 18 side falls from the conveyor belt 20 . The two-point chain line in FIG. 1 shows an example of the area where the raw material exists. Moreover, the arrow of the two-point chain line in FIG. 1 shows an example of the movement direction of a raw material. Hereinafter, the conveyor belt head pulley 18 side end of the conveyor belt 20 may also be referred to as the raw material input side end.

Conveyor belt head cover 22 is positioned at the vertical top of switching chute 14. The conveyor head cover 22 is a hollow container, and is provided so as to surround the raw material input side end of the conveyor belt 20 . The conveyor hood 22 is provided with an opening 60 connecting the inside and outside of the conveyor hood 22 to a part of the side. A part of the conveyor belt head pulley 18 and the raw material input side end of the conveyor belt 20 extend into the conveyor belt head cover 22 through the opening 60 of the conveyor belt head cover 22 .

A discharge port 62 that communicates the inside and outside of the conveyor hood 22 is formed at the lower portion of the conveyor hood 22 . The discharge port 62 is formed in a circular shape. The receiving port 52 of the switching chute 14 is opposite to the discharge port 62 of the conveyor head cover 22 . The inner shape of the conveyor hood 22 gradually changes from an angular shape to a circle as it extends from the top surface 64 side of the conveyor hood 22 toward the discharge port 62 side, and the inner space gradually shrinks and narrows, whereby the conveyor hood 22 A slope 66 is formed inside.

The raw material detection part 24 is provided in the vicinity of the conveyor head pulley 18 of the conveyor belt 20 . The raw material detection unit 24 detects the presence or absence of raw materials to be fed from the conveyor belt 20 based on the weight of the raw materials on the conveyor belt 20 at the installed position. Specifically, the installation position of the raw material detection part 24 is set to the position where a raw material will fall from the conveyor belt 20 when predetermined time elapses from detection of a raw material. The predetermined time is set to, for example, 10 seconds or the like, but may be set arbitrarily in consideration of the conveyance speed of the conveyor belt 20 .

The raw material detection unit 24 detects that there is a raw material on the conveyor belt 20 when the weight is equal to or greater than a predetermined threshold, and detects that there is no raw material on the conveyor belt 20 when the weight is less than the predetermined threshold. Therefore, the raw material detection unit 24 detects the end of the raw material falling from the conveyor belt 20 when the weight changes from a state above a predetermined threshold value to a state below a predetermined threshold value. The end of the raw material means the side where the timing of dropping is the latest among the raw materials continuously supplied in batches. And, the raw material detection part 24 detects the beginning of the raw material which falls from the conveyer belt 20 when the weight changes from the state which has not reached a predetermined threshold value to the state which is more than a predetermined threshold value. The starting end of the raw material means the side where the timing of dropping is earliest among the raw materials continuously supplied in batches.

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

The raw material input adjustment device 26 has a movable part 70 , a fixed part 72 and a drive mechanism 74 . The movable part 70 is provided movably within the conveyor head cover 22 . The movable part 70 can be configured to be located at an intermediate position, a retracted position, and a receiving position, and can move among the intermediate position, the retracted position, and the receiving position, which will be described in detail later. The intermediate position exists in the middle of moving from the retracted position to the receiving position, or in the middle of moving from the receiving position to the retracted position.

The intermediate position refers to a position that is hit by at least a part of the material falling from the conveyor belt 20 . Furthermore, the intermediate position refers to a position where the falling path of the material falling from the movable portion 70 passes through the center of the receiving port 52 when the material colliding with the movable portion 70 falls from the movable portion 70 . FIG. 1 shows the situation where the movable part 70 is in the middle position.

The evacuation position is located outside the area where the materials falling from the conveyor belt 20 exist. Specifically, the retracted position is located on the opposite side of the conveyor belt 20 with respect to the existence area of the raw material falling from the conveyor belt 20 . The receiving position is a position where the movable part 70 forms a receiving container together with the fixed part 72 .

Fig. 2 is a schematic perspective top view of the conveyor belt head cover 22 seen from vertically above when the movable part 70 is in the middle position. FIG. 3 is a schematic cross-sectional view showing the configuration of the furnace roof apparatus 1 when the movable portion 70 is located at the retracted position. Fig. 4 is a schematic cross-sectional view showing the configuration of the furnace roof apparatus 1 when the movable part 70 is located at the receiving position. Fig. 5 is a schematic perspective top view of the conveyor head cover 22 seen from vertically above when the movable part 70 is at the receiving position. Hereinafter, the raw material input adjustment device 26 will be described in detail with reference to FIGS. 1 to 5 .

The fixing part 72 is fixedly arranged on the opposite side of the retracted position with respect to the area where the raw material dropped from the conveyor belt 20 exists. The fixing part 72 is supported by the side of the conveyor head cover 22 through the fixing support part 80 .

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

The inclined portion 84 is formed in a plate shape and continues to the vertically downward edge of the vertical portion 82 . The inclination part 84 deviates and inclines toward the falling path side of a raw material as it extends vertically downward. The angle of the inclined portion 84 with respect to the horizontal plane is equal to or greater than the angle of repose of the raw material.

The end face part 86 is provided in the width direction both ends of the conveyor belt 20 of the vertical part 82 and the inclined part 84. The end portion 86 protrudes vertically upward from the inclined portion 84 and protrudes from the vertical portion 82 toward the falling path side of the raw material.

The movable part 70 includes a rear part 90 , a bottom part 92 and a side part 94 . As shown in FIG. 4 , the rear surface portion 90 is formed in a plate shape that expands in the width direction and the vertical direction of the conveyor belt 20 in the receiving position. When the rear part 90 is located at the receiving position, it is arranged to face the vertical part 82 of the fixing part 72 with the vertical part 82 of the fixing part 72 sandwiching the falling path of the raw material therebetween. The length of the back surface part 90 along the width direction of the conveyer belt 20 is extended beyond the width of the area|region where the raw material on the conveyer belt 20 exists. back face 90's When the edge on the vertically upper side is at the receiving position, it is located vertically above the area where the material dropped from the conveyor belt 20 exists.

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

The bottom portion 92 is formed in a plate shape and continues to the edge of the rear portion 90 on the vertically downward side. The bottom portion 92 is inclined toward the fixing portion 72 side as it extends vertically downward from the vertically downward side edge of the rear portion 90 .

A protrusion 98 is provided on the upper surface side of the bottom portion 92 . The protrusion 98 is located in the vicinity of the edge on the vertically downward side. As described above, when the movable part 70 is located in the intermediate position, at least a part of the raw material collides with the bottom surface part 92 . A part of the raw material which collided with the bottom surface part 92 stays on the upper surface of the bottom surface part 92 by the protrusion part 98. As shown in FIG. In this way, the material falling from the conveyor belt 20 collides with the material on the bottom surface 92 , and the bottom surface 92 is protected by the material on the bottom surface 92 . That is, the protruding portion 98 also functions as an element of the self-protector.

The inclination angle of the bottom surface portion 92 relative to the horizontal plane when located in the retracted position is larger than the inclination angle of the bottom surface portion 92 relative to the horizontal plane when located in the intermediate position. Therefore, when the movable part 70 moves to the retracted position, at least a part of the raw material accumulated on the bottom surface 92 by the protrusion 98 in the intermediate position falls from the movable part 70, and the raw material on the bottom surface 92 can be reduced.

The side parts 94 are provided at both ends in the width direction of the conveyor belt 20 of the rear part 90 and the bottom part 92 . The side surface portion 94 protrudes vertically upward from the bottom surface portion 92 when located at the receiving position, and protrudes from the rear surface portion 90 toward the fixing portion 72 side.

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

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

The driven shaft support portion 106 extends from the rear portion 114 of the conveyor head cover 22 toward the conveyor belt 20 side. The driven shaft 108 is provided at the front end of the driven shaft support portion 106 and extends along the width direction of the conveyor belt 20 . The driven shaft 108 is arranged at a position opposite to the conveyer belt 20 with respect to the falling path of the raw material, and is arranged at a lower position than the height position of the drive shaft 100 . The driven shaft 108 is supported by the driven shaft support portion 106 so as to be rotatable around the central axis of the driven shaft 108 .

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

The movable part driving device 28 is connected to the drive shaft 100 and rotates the drive shaft 100 . The movable part driving device 28 may be a hydraulic device or an electric device. Moreover, the movable part driving device 28 has a movable part position detection part which detects the rotation angle (in other words, the rotation position) of the drive shaft 100. As shown in FIG.

It is assumed here that the drive shaft rotates in a direction in which the end portion of the drive arm portion 102 on the drive connection portion 104 side falls downward. In this way, the end portion of the driven arm portion 110 on the side surface portion 94 side is linked with the drive arm portion 102 and falls downward with the driven shaft 108 as a fulcrum. Thereby, the movable part 70 is directed towards the solid The direction of the fixed part 72 moves. The movable part 70 rotates in a direction in which the inclination of the bottom surface part 92 with respect to the horizontal plane becomes smaller as it approaches the fixed part 72 . Then, when the receiving position is reached, the fixed part 72 and the movable part 70 are combined with each other to form a receiving container opened vertically upward in the middle of the falling path of the raw material.

In addition, it is assumed here that the drive shaft 100 rotates in a direction in which the end portion of the drive arm portion 102 on the drive coupling portion 104 side is lifted upward. In this way, the end portion of the driven arm portion 110 on the side surface portion 94 side is linked to the driving arm portion 102 and lifted upward with the driven shaft 108 as a fulcrum. Thereby, the receiving container is decomposed into the movable part 70 and the fixed part 72 , and the movable part 70 moves away from the fixed part 72 . The movable part 70 rotates in the direction in which the inclination of the bottom surface part 92 with respect to the horizontal plane becomes larger as it moves away from the fixed part 72 .

An over-accumulation prevention sensor 30 is located within the conveyor hood 22 . The over-accumulation prevention sensor 30 is located vertically above the movable part 70 when it is arranged at the receiving position, and is located outside the area where the material falling from the conveyor belt 20 exists. Even if the movable part 70 is arranged in the middle position, there is a possibility that the raw material will be clogged in the gap between the movable part 70 and the fixed part 72 due to the state of the raw material about to fall from the conveyor belt 20 . When the raw material is clogged, the raw material is excessively accumulated on the movable portion 70 and the falling of the raw material from the conveyor belt 20 is hindered. The excessive accumulation prevention sensor 30 detects when the material is excessively accumulated on the movable part 70 .

Here, when the excessive accumulation prevention sensor 30 detects excessive accumulation, the movable part 70 may temporarily move to the withdrawn position to increase the gap between the movable part 70 and the fixed part 72 . And, when the situation of excessive accumulation is eliminated, the movable part 70 can be arranged to the middle position again.

The control unit 32 is a computer composed of a semiconductor integrated circuit. This semiconductor integrated circuit system includes a central processing unit, a ROM storing programs and the like, a RAM as a work area, and the like. The control unit 32 functions in cooperation with the program.

When the control unit 32 receives an instruction to inject raw materials, or when a predetermined raw material input timing comes, it transmits an input start command to each unit, and starts preparation operations for receiving raw materials. The driving unit of the upper closing valve 42 opens the upper closing valve 42 of the furnace top chute 10 to be received when receiving the charging start command. And the switching chute drive device 16 rotates the switching chute 14 so that the direction which becomes the delivery port 54 may face the furnace top chute 10 which becomes a receiving object, when receiving the input start command. The movable part driving device 28 rotates the driving shaft 100 until the rotation angle of the driving shaft 100 becomes an angle corresponding to the middle position (the middle position rotation angle) when receiving the input start command. Thereby, the movable part 70 is moved to the intermediate position and held at the intermediate position. Then, loading of raw materials on the conveyor belt 20 starts at the lower end side of the conveyor belt 20 .

The control part 32 acquires the detection result of the raw material detection part 24 sequentially after sending an input start command. The control part 32 confirms whether the preparatory operation|movement of each part is complete|finished at the time when the start of a raw material is detected. When the preparatory operation is completed when the start of the raw material is detected, the control unit 32 determines that it is normal and continues to control each unit. On the other hand, when the preparatory operation is not completed when the start of the raw material is detected, the control unit 32 stops the entire furnace roof apparatus 1 .

In this way, when the feeding of raw materials starts normally, since the movable part 70 is in the middle position, as shown in FIG. The raw material colliding with the bottom surface 92 moves downward along the bottom surface 92 and falls from the vertically downward edge of the bottom surface 92 . In addition, among the raw materials falling from the conveyor belt 20, the raw materials that did not collide with the bottom portion 92 meet the raw materials that fell from the bottom portion 92 after colliding with the bottom portion 92, and the falling direction becomes that of the raw materials that fell from the bottom portion 92. direction and fall.

In this way, since the movable part 70 is located in the middle position, the raw material falling from the movable part 70 will pass through the center of the receiving port 52 in the whole of the switching chute 14 including the receiving port 52 as shown in FIG. predetermined area. Thereafter, the raw material falls onto the rotation center of the switching chute 14 on the inner surface of the switching chute 14 and flows along the switching chute 14 .

Here, FIG. 6(A), (B) and FIG. 7(A), (B) are diagrams illustrating a furnace roof apparatus A of a comparative example in which the raw material input adjustment device 26 is not provided. The furnace top device A of the comparative example is arranged in a row with three top material troughs 10 , and the direction of the switching chute 14 is switched at 120 degrees according to the configuration of the furnace top material hoppers 10 . FIG. 6(A) is a cross-sectional view of the furnace roof apparatus A of the comparative example when the direction of the horizontal direction of the switch chute 14 is the same as the direction of the horizontal direction of the conveyor belt 20 . FIG. 6(B) is a plan view of the furnace roof apparatus A of the comparative example when the direction of the horizontal direction of the switching chute 14 is the same as the direction of the horizontal direction of the conveyor belt 20 . 7(A) is a cross-sectional view of the furnace roof apparatus A of the comparative example when the horizontal direction of the chute 14 is switched to a direction rotated by 120 degrees with respect to the horizontal direction of the conveyor belt 20 . FIG. 7(B) is a plan view of the furnace roof apparatus A of the comparative example when the horizontal direction of the chute 14 is switched to a direction rotated by 120 degrees with respect to the horizontal direction of the conveyor belt 20 .

In the situation shown in Fig. 6 (A), (B), the raw material system falling from the raw material input side end of the conveyor belt 20 collides with the slope 66 in the conveyor belt head cover 22, and moves downward along the slope of the conveyor belt head cover 22 flow. The raw materials discharged from the conveyor head cover 22 pass through the vicinity of the receiving port 52 of the switching chute 14 . Moreover, the raw material entering the switching chute 14 will collide with the inner surface of the switching chute 14 and move downward along the inner surface of the switching chute 14 . At this time, the inclination direction of the inclined surface 66 of the conveyor head cover 22 is opposite to the inclination direction of the inner surface of the switching chute 14 . Therefore, as shown by the arrow B10 of the solid line in FIG. As a result, the raw material falls relatively in the furnace top chute 10 to the radially side of the furnace core.

On the other hand, in the situation shown in FIG. 7(A), (B), the inclination direction of the inclined surface 66 of the conveyor head cover 22 is not opposite to the inclination direction of the inner surface of the switching chute 14 . Therefore, the solid line in Figure 7(B) Shown by the arrow B12 of the arrow B12, the transverse speed when the raw material passes through the switching chute 14 is accelerated due to the influence of the speed when passing through the inclined surface 66. As a result, the raw materials are relatively dropped to the radially outer side of the furnace in the top chute 10 .

In addition, in the situation shown in Fig. 7 (A) and (B), due to the influence of the speed when passing through the slope 66, the rotation angle of the raw material system relative to the switching chute 14 is closer to the direction of the conveyor belt 20 along the periphery of the furnace core. Offset and flow in the switch chute 14. As a result, the raw materials fall in the top chute 10 to a position shifted along the periphery of the furnace core.

In this way, when a plurality of top hoppers 10 are arranged in a row, there is a possibility that the input position of raw materials for each top chute 10 will be different due to the difference in the direction of the switching chute 14 . As a result, there is a possibility that the precision of the control for charging the raw materials in the top chute 10 into the vertical furnace may decrease.

8(A) and (B) are diagrams illustrating the action and effect of the furnace top device 1 of this embodiment. FIG. 8(A) shows the situation that the orientation of the horizontal direction of the switching chute 14 is the same as that of the conveyor belt 20 . FIG. 8(B) shows a case where the orientation of the horizontal direction of the switch chute 14 is rotated by 120 degrees with respect to the orientation of the conveyor belt 20 in the horizontal direction.

As shown in Fig. 8(A) and (B), in the furnace top device 1 of this embodiment, the movable part 70 is movably arranged in the conveyor head cover 22. 70 remains in the middle position. Thereby, the furnace roof apparatus 1 changes the falling direction of the raw material by the movable part 70 before the raw material falling from the conveyor belt 20 reaches the slope 66 of the conveyor head cover 22 . Therefore, the furnace roof unit 1 can cause the raw material to fall in a path passing through the center of the receiving port 52 . That is, the furnace roof apparatus 1 of the present embodiment can drop the raw materials to the position of the rotation center of the switching chute 14 on the inner surface of the switching chute 14 .

In addition, the vertically downward side end of the movable part 70 is positioned higher than the vertically downward side end of the slope of the conveyor head cover 22 . That is, the furnace roof device 1 can make the bottom surface 92 of the movable part 70 switch to the switching chute. The falling distance of the inner surface of 14 is longer than the falling distance of the inclined surface 66 of the conveyor head cover 22 to the inner surface of the switching chute 14 . Thereby, in the furnace roof apparatus 1, when the raw material is dropped from the movable part 70, the lateral velocity component can be sufficiently consumed in the middle of the falling path, and the raw material can reach the switching chute 14 in a state where the lateral velocity component is small. inside. That is to say, the furnace roof device 1 of this embodiment can make the raw material collide with the inner surface of the switching chute 14 toward the vertical downward direction instead of making the raw material collide with the inner surface of the switching chute 14 from a direction inclined relative to the vertical direction.

Thereby, as shown in FIG. 8(A) and (B), in the furnace top device 1, the falling position of the raw material on the switching chute 14 can be fixed at the rotation center of the switching chute 14 regardless of the direction of the switching chute 14. s position. In addition, in the furnace roof apparatus 1, since the influence of the lateral velocity component of the raw material before hitting the switching chute 14 is suppressed, the speed of the raw material passing through the switching chute 14 can be substantially the same regardless of the direction of the switching chute 14. .

Therefore, according to the furnace top device 1 of this embodiment, no matter what the direction of the switching chute 14 is, raw materials can be accurately injected into the desired position in the furnace top chute 10 .

In addition, near the end of the raw materials conveyed by the conveyor belt 20 , the stack of raw materials may collapse during conveyance by the conveyor belt 20 , and the raw materials may be scattered on the conveyor belt 20 . The weight of scattered raw materials is less than that normally placed on the conveyor belt 20 , so that the detection by the raw material detection unit 24 may not reach a predetermined threshold. If this is the case, the raw material detecting unit 24 regards the position where the weight does not reach a predetermined threshold value as the end of the raw material before the raw material including the scattered part reaches the actual end. That is, the detection of the end by the raw material detection unit 24 misses the part where the raw material is scattered. Hereinafter, the remaining portion of the raw material missed by such an end detection, in other words, the raw material located after the detected end may also be referred to as residual ore.

If there is residual ore after the end of the raw material is detected, the residual ore is fed from the conveyor belt 20 to the upper closing valve 42 of the furnace top chute 10 . The upper closing valve 42 is closed according to the detection result of the end of the raw material as described above. In this way, the residual ore may be caught between the valve seat 44 and the valve body 46 of the upper closed valve 42 , so that the airtightness of the furnace top chute 10 may be lowered. As a result, the pressure in the top hopper 10 decreases with respect to the pressure in the vertical furnace, which may affect the operation of the vertical furnace.

In view of this, the furnace roof apparatus 1 of this embodiment performs the following treatment on residual ore. When the control unit 32 detects the end of the raw material during feeding of the raw material, it transmits a retracted position command to temporarily move the movable portion 70 to the retracted position to the movable portion drive device 28 . The movable part driving device 28 rotates the drive shaft 100 until the rotation angle of the drive shaft 100 becomes an angle corresponding to the retracted position (retracted position rotation angle) when receiving the retracted position command. Thereby, the movable part 70 is moved to a retracted position.

In this way, the raw material remaining on the bottom surface portion 92 of the movable portion 70 falls as the movable portion 70 retracts. Since the inclination angle when the bottom surface part 92 is in a retracted position is larger than the inclination angle when it is an intermediate position, more raw materials on the bottom surface part 92 can be dropped. At this time, the falling raw materials are put into the furnace top chute 10 through the discharge port 62 , the switch chute 14 and the raw material input port 40 . In addition, when the movable part 70 is moved to the retreat position first, and then the movable part 70 is moved to the receiving position, more residual ore can be received.

The control unit 32 transmits an accepted position command to move the movable unit 70 to the accepted position to the movable unit driving device 28 when a predetermined time has elapsed since the movable unit 70 reached the retracted position. This predetermined time corresponds to the time during which the movable portion 70 remains at the retracted position. The predetermined time is set to allow the material on the bottom surface 92 to fall sufficiently, and is set to be the period during which the end of the material can be moved from the material detection unit 24 to the material input side end of the conveyor belt 20 by the movable portion 70. The time from the back-off position to the receiving position. The movable part driving device 28 rotates the drive shaft 100 to the drive shaft 100 when receiving the position command. The rotation angle of 100 becomes the angle corresponding to the receiving position (receiving position rotation angle). Thereby, the movable part 70 is moved to the receiving position.

When the movable part 70 reaches the receiving position, the fixed part 72 and the movable part 70 are combined with each other to form a receiving container in the middle of the falling path of the raw material. The residual ore missed by the detection of the end of the raw material is captured and held by the receiving container before reaching the discharge port 62 . After the receiving container is formed, the control unit 32 causes the driving unit of the upper closing valve 42 to close the upper closing valve 42 .

In the furnace top device 1 , even if the upper closing valve 42 is closed, residual ore can be prevented from being caught between the valve seat 44 and the valve body 46 of the upper closing valve 42 . As a result, the furnace roof apparatus 1 can prevent the airtightness of the furnace roof bunker 10 from being lowered.

In addition, referring to FIG. 7(B), as mentioned above, in the furnace roof device A of the comparative example, the input position of the raw material in the furnace top chute 10 will be shifted along the periphery of the furnace core due to switching the direction of the chute 14. situation. In contrast, the furnace top device 1 of this embodiment can reduce the lateral velocity component when the raw material reaches the inner surface of the switching chute 14, and can suppress the relative position of the raw material input position in the furnace top chute 10 relative to the furnace core. Offset around.

In addition, there are cases where it is desired to further improve the accuracy of the feeding position of the raw material in the top chute 10 . On the other hand, the furnace roof apparatus 1 of this embodiment can also set the rotation angle of the switching chute 14 as follows.

9(A) and (B) are schematic plan views illustrating the setting of the rotation angle of the switching chute 14 . The furnace top chute 10A is located substantially directly below the movable part 70 in plan view. When viewed from above, the top chute 10B is shifted 120 degrees from the top chute 10A in the clockwise direction around the furnace core. When viewed from above, the top chute 10C is arranged offset by 120 degrees from the top chute 10A in the counterclockwise direction around the furnace core. Fig. 9 (A) shows the situation that the switching chute 14 is directed to the furnace top chute 10B. Figure 9(B) shows that the switching chute 14 points to the furnace top chute 10C case. In Fig. 9(A) and (B), a one-point chain line 120B shows a reference angle based on the arrangement of the furnace top chute 10B. One point chain line 120C shows a reference angle based on the arrangement of furnace top chute 10C.

When raw materials are to be put into the top chute 10B, during the process of the raw materials passing through the switching chute 14, there is a reference angle (one point chain line 120B) relative to the top chute 10B that is biased toward the top chute 10C around the furnace core. side (conveyor belt 20 side) flow tendency.

In this regard, when the raw materials are to be put into the furnace top chute 10B, as shown by the one-point chain line 122B in FIG. The angle of rotation corrected in the direction of the movable part 70 around the core. Thereby, as shown by the arrow 124B of a solid line, the raw material which passed the switching chute 14 can be made to flow in the direction of the reference angle of the top chute 10B. As a result, the raw material can be injected into a desired position of the top chute 10B, and the accuracy of the input position of the raw material in the top chute 10B can be further improved.

In addition, when raw materials are to be put into the furnace top chute 10C, during the process of the raw materials passing through the switching chute 14, there is a reference angle (one point chain line 120C) relative to the furnace top chute 10C that is biased towards the top material around the furnace core. The tendency of flow on the tank 10B side (conveyor belt 20 side).

In this regard, when feeding raw materials into the top chute 10C, the rotation angle of the switching chute 14 is set to deviate from the reference angle of the top chute 10C as shown by a one-point chain line 122C in FIG. 9(B). The angle of rotation corrected in the direction of the movable part 70 around the core. Thereby, as shown by the arrow 124C of a solid line, the raw material which passed the switching chute 14 can be made to flow in the direction of the reference angle of 10 C of furnace top chutes. As a result, the raw material can be injected into a desired position of the top chute 10C, and the accuracy of the input position of the raw material in the top chute 10C can be further improved.

The control unit 32 rotates the switching chute 14 by making the rotation angle of the switching chute 14 the above-mentioned set rotation angle by the switching chute driving device 16 when switching the receiving target furnace top chute 10 . change. Here, the amount of correction of the rotation angle of the switching chute 14 can be determined by, for example, performing a test run in advance to confirm the relationship between the rotation angle of the switching chute 14 and the feeding position of the raw material.

An implementation has been described above with reference to the drawings, but the present disclosure is not limited to the above implementation. It should be clear to those skilled in the art that various variations or amendments conceivable within the scope described in the scope of claims are also naturally included in the technical scope of the present disclosure.

1: furnace top device

10: Furnace top trough

12: Receiving hopper

14: Switch chute

16:Switch chute driving device

18: Conveyor head pulley

20: conveyor belt

22: Conveyor belt hood

24: Raw material testing department

26: Raw material input adjustment device

28: Movable part driving device

30: Prevent excessive accumulation of sensors

32: Control Department

40: Raw material input port

42: Upper closing valve

44: valve seat

46: valve body

50: Lower opening

52: Receiving port

54: send exit

56: Central axis

60: opening

62: export

64: top surface

66: Bevel

70: Movable part

72: fixed part

74: Driving mechanism

80: fixed support

82: vertical part

84: inclined part

86: end face

90: back face

92: Bottom face

94: side face

96: protrusion

98: protrusion

100: drive shaft

102: drive arm

104: Drive link

106: Driven shaft support part

108: driven shaft

110: Slave arm

112: Driven connection part

114: Rear

Claims (5)

A furnace top device is provided with: Conveyor belt head cover, which surrounds the raw material input side end of the conveyor belt; The switching chute has a receiving port opposite to the discharge port of the aforementioned conveyor belt head cover, and can rotate with the central axis of the aforementioned receiving port; A plurality of furnace top feed troughs are arranged around the furnace core at the vertically lower side of the aforementioned switching chute; and The movable part is movably arranged in the aforementioned conveyor belt head cover; The movable part may be disposed at an intermediate position where at least a part of the raw material falling from the conveyor belt collides. The furnace roof apparatus according to claim 1, wherein the movable part is movable to a retracted position outside the area where raw materials falling from the conveyor belt are present; The inclination angle of the bottom surface of the movable part relative to the horizontal plane when located in the retracted position is larger than the inclination angle of the bottom surface of the movable part relative to the horizontal plane when located in the intermediate position. The furnace roof device as described in Claim 2 further includes a fixing part, and the fixing part is fixedly arranged on the opposite side of the aforementioned retracted position relative to the area where the raw materials falling from the aforementioned conveyor belt are located; The aforementioned movable portion is movable to a receiving position where it forms a receiving container together with the aforementioned fixed portion. The furnace top device as described in claim 3 is further equipped with: The raw material detection part detects the end of the raw material to be input from the aforementioned conveyor belt; and The control unit maintains the movable part at the intermediate position during feeding of the raw material, and moves the movable part from the intermediate position to the retracted position in response to the detection of the end of the raw material by the raw material detection part, and then Move to the aforementioned receiving location. The roof device according to any one of Claims 1 to 4, wherein the rotation angle of the switching chute is set to deviate toward the periphery of the furnace core relative to the reference angle based on the configuration of the furnace top chute The rotation angle of the direction correction of the aforementioned movable part.

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