JPS6396205A - Raw material charging apparatus for blast furnace - Google Patents

Abstract

PURPOSE:To reduce the segregation of grain size by charging raw material at the optional position in a furnace top bunker, by changing suitably relative operation with an upper rotary chute rotating on the same axis at the furnace top bunker and a lower rotary chute rotating on the same axis as the lower discharging hole of this chute. CONSTITUTION:The raw material charging apparatus 1 for the blast furnace is composed of the upper rotary chute 2 and the lower rotary chute 7 and the raw material is supplied to the upper charging hole 4, to charge in the furnace top bunker from the discharging hole 9. Then, at the time of driving a first device 12, the upper rotary chute 2 is rotated around the axial center 37 on the same axis as the furnace top bunker toward omega1 direction and the lower rotary chute 7 is rotated toward the same direction at the same speed and rotated around the axial center 38 toward omega2 direction. Further, at the time of driving a second driving device 20, only the lower rotary chute 7 is rotated toward omega2 direction, and at the time of driving the first and second driving apparatuses 12, 20 at the same time, the upper rotary chute 2 is rotated toward omega1 direction and the lower swinging chute 7 is rotated toward omega2 direction. Therefore, by changing suitably the relative operation of the upper and the lower rotary chutes 2, 7, the segregation of grain size in the raw material is reduced.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for charging raw materials in a blast furnace, which receives raw materials from a hoisting device such as a conveyor and charges the raw materials into a top bunker provided on a blast furnace. It is related to the device.

[Prior Art] Generally, a raw material charging station is installed at the top of a top bunker installed at the top of a blast furnace, and the material is received from a hoisting device such as a conveyor that transfers raw material from a raw material source such as on the ground. It is well known that raw materials are charged into the furnace top bunker.

Conventionally, a raw material charging device for a blast furnace has been constructed as shown in FIGS. 7 and 8.

FIG. 7 shows a first conventional example. As shown in the figure, a furnace top bunker b is provided at the upper part of the furnace a.

This furnace top bunker b consists of an upper storage bunker C and a lower pressure equalization bunker d.

A raw material charging device e is rotatably provided on the upper storage bunker C coaxially therewith. This raw material charging device e is formed, for example, by a rotating chute, and its discharge port f is eccentrically formed so as to be inclined outward in the radial direction. A hoisting device such as a conveyor is provided above the raw material charging device e to transport the raw material g from a raw material source such as on the ground.

The raw material g transferred from the raw material source on the ground or the like by the hoisting device is carried into the raw material charging station AA C.

The raw material g is carried into the raw material charging device e while rotating the raw material charging device e. The raw material 9 that has passed through the raw material charging device e is temporarily stored in the storage bunker C. The raw material 9 temporarily stored in the storage bunker C is charged into the pressure equalization bunker a, and after charging is completed, the internal pressure of the pressure equalization bunker d is changed to the blast furnace a to prevent pressure leakage from inside the blast furnace a. After maintaining the internal pressure equal to the internal pressure, the raw material is charged from the pressure equalizing bunker d to the blast furnace a.

[Problems to be Solved by the Invention] By the way, this type of blast furnace raw material charging device C has the following problems.

The raw material 9 to be charged into the storage bunker C is charged by the raw material charging device e formed by a rotating chute in a ring shape or only at an arbitrary point on the ring, resulting in poor controllability of raw material distribution. There was a problem.

In this way, the vertical cross section of the raw material 9 charged and stored in a ring shape is M-shaped, the slope of each mountain is long, and there are coarse particles near the inner wall and in the center of the storage bunker C. Raw material 9
However, fine grain raw material Q was segregated in a ring shape in the mountain area between these.

Therefore, when the raw material Q that had been segregated in the storage bunker C was charged into the pressure equalization bunker a, the coarse and fine raw materials 9 were segregated in layers.

In order to solve the problems in the first conventional material charging device e, a second conventional material charging device i for a blast furnace as shown in FIG. 8(A) was devised. As shown in the figure, the second conventional blast furnace raw material charging device i is rotatably installed on the same axis at the axis J of the raw material inlet of the furnace top bunker b, and the upper charging port k is connected to a conveyor or the like. It opens facing the discharge end of the hoisting device, and a lower discharge port 1 is provided on the rotary chute m provided on the same axis as above, and a lower discharge port 1 of the rotary chute m is provided so as to be freely tiltable in the radial direction. and a tilting chute n.

In this second conventional blast furnace raw material charging device i, the raw material distribution characteristics are improved compared to the first conventional blast furnace raw material charging device e, and as shown in FIG. 8(B), multiple Although the raw material discharge position p has a concentric circular shape, the following problems still exist.

Since the tilting chute n is operated against the falling pressure of the raw material g, the drive output of the tilting chute n is large.
There was a problem in that the drive device became large.

In addition, since the angle at which the raw material 9 is ejected from its discharge port 0 differs depending on the tilting angle of the tilting chute n, for example, when the discharge port q of the storage bunker C is branched into a plurality of branches, each discharge port When selecting q, there was a problem in that it was difficult to charge the raw material g concentrically.

Furthermore, for example, when charging the raw material Q to an arbitrary position in the storage bunker C, the tilting angle of the tilting chute n allows the raw material 9 to be
There was a problem in that the drop curve changed and the drop point control accuracy was poor.

In view of the above-mentioned problems, the present invention improves the controllability of raw material distribution and the accuracy of falling point control, reduces the segregation of raw materials in the top bunker, and downsizes the drive device. The purpose of this invention is to provide a raw material charging device for a blast furnace that can perform the following steps.

[Means for Solving the Problems] In order to solve the problems in the prior art, the present invention is provided at the raw material inlet of the furnace top bunker so as to be rotatable on the same axis, and the upper loading inlet is connected to the hoisting device. An upper rotating chute that opens facing the discharge end and is eccentrically provided so that the lower discharge port is inclined outward in the radial direction, and a lower discharge port of the upper rotating chute that is rotatably provided coaxially with , and a lower swing chute eccentrically arranged so that the discharge port is inclined radially outward.

[Function] The rotating speed of the upper rotating chute, which is constructed as described above and is coaxially provided with the furnace top bunker, and the lower rotating chute that is rotatably provided coaxially with the lower discharge port of the upper rotating chute is changed. The raw material can be charged to any position in the top bunker by changing the mutual operations by stopping one of the chutes.

[Example] An example of the blast furnace raw material charging apparatus of the present invention will be described in detail below with reference to the accompanying drawings.

Similar to the conventional method, the blast furnace charging device 5A of the present invention includes a top bunker b consisting of a top bunker C and a pressure equalizing bunker d provided at the top of the blast furnace a for charging raw materials into the blast furnace a; It is provided above the bunker b, and is located between the hoisting wave Hh of a conveyor or the like that transfers raw materials from a raw material source such as on the ground.

As shown in FIG. 1 (A), the upper part of the raw material charging device 1 is formed by an upper rotating chute 2. This upper rotating chute 2 is connected to the raw material inlet of the furnace top bunker b on the same axis From the fixed side of the furnace top bunker, etc., so that it can rotate freely.
It is supported by a bearing 3. This upper rotating chute 2
The upper loading port 4 is opened facing the discharge end of the hoisting device such as the conveyor. Further, the lower discharge port 5 of the upper rotating chute 2 is eccentrically formed so as to be inclined outward in the radial direction. That is, the upper rotating chute 2 is a bottomed cylindrical body in which the lower discharge port 5 is formed eccentrically from the axis at the bottom 6 of the chute 2, and the bottom 6 is inclined toward the lower discharge port 5. A lower swing chute 7 is attached to the lower discharge port 5 of the upper swing chute 2, which is formed by a lower swing chute 2, and a second bearing 8 is mounted on the upper swing chute 2 so as to be rotatable coaxially with the lower swing chute 7. It is supported by The discharge port 9 of the lower rotating chute 7 is eccentrically formed so as to be inclined radially outward from the axis of the lower discharge port 5. That is, the lower rotating chute 7 is formed of a cylindrical body whose diameter is gradually reduced toward the discharge port 9, and is attached to the lower discharge port 5 of the upper rotating chute 2 at an angle. In order to rotate the upper rotating chute 2 and the lower rotating chute 7, the following gear-like structure is constructed. A first externally toothed gear 10 is attached to the upper part of the main body of the upper swing chute 2 along its outer periphery, and this '1st externally toothed If7 wheel 10 is supported by the first bearing 3. ing. This first external gear 10 is
This second external gear 11 meshes with a first pinion gear 13 attached to the first drive device 12. The drive shaft of this first drive device 12 is supported by a third bearing 14 provided on the fixed side. An internal gear 16 of a planetary gear 15 is suspended and integrally attached to the second outward gear 11. This planetary gear 15, as shown in FIG.
It consists of a sun gear 19 which is sandwiched between 7 and 18 and meshes with each other. A drive shaft of a second drive device 2o is attached to one of the sun gears by passing through the second external gear 11, and this drive shaft is attached to a fourth bearing 21 which is disposed on the fixed side. and a fifth wheel supported by the second outer mm wheel 11.
It is supported by a bearing 22.

The support shaft of the intermediate gear 17.18 is a sixth bearing 23.2.
4 is supported. The sixth bearings 23 and 24 are attached to both ends of a support arm 26 erected on the third external gear 25. The support shaft of the third external tooth width 25 is supported by a seventh bearing 27 provided on the fixed side. The third external gear 25 meshes with the upper external gear 29 of the two-stage external gear 28. This two-stage external tooth 128
is supported by an eighth bearing 3o attached to the middle part of the main body of the upper swing chute 2 along its outer periphery. The lower external gear 31 of the two-stage external gear 28 meshes with the upper binion gear 33 of the two-stage binion gear 32. This two-stage binion gear 32 is connected to the upper rotating chute 2.
It is supported by a ninth bearing 34 attached to the lower part of the main body.

Further, the lower binion gear 35 of the two-stage binion gear 32 meshes with a fourth external gear 36 provided along the outer periphery of the lower rotating chute 7.

In addition, the tooth number ratio of these tooth widths is, for example, the upper rotating chute 2.
It is determined that the lower swing chute 7 rotates once to the right when the rotating chute 7 rotates once to the right.

Next, the operation of one embodiment of the raw material charging device 1 of the present invention constructed as described above will be described.

FIG. 1(B) shows the operation of the upper rotating chute 2 and the lower rotating chute 7. Upper rotating chute 2
The driving force of the first drive device 12 is the first pinion gear 1
3 to the first external gear 10 via the second external gear 11
As a result, it rotates around a first axis 37 coaxial with the furnace top bunker b (indicated by W1 in the figure). Next, the lower swing chute 7 is rotated by the first driving vJ device 12 and the second driving device 20.

First drive! The driving force of A position 12 is the first pinion gear 1
3. Second external gear 11, internal gear 16, intermediate gear 17
, 18, support arm 26, third external gear 25, two-stage external gear 28, two-stage binion gear 32, and fourth external gear 36
The lower rotating chute 7 is rotated around the second axis 38 of the lower discharge port 5 of the upper rotating chute 2, which is formed eccentrically from the first axis 37 (at W2 in the figure). (show) In addition, the driving force of the second drive unit @20 includes the sun gear 19, intermediate gears 17 and 18, support arm 26,
Transmitted in this order to the third external gear 25, the two-stage external gear #A wheel 28, the two-stage binion gear 32, and the fourth external gear 36,
The lower swing chute 7 is rotated W2 around the second axis 38.

That is, by driving the first drive device 12, the upper rotating chute 2 rotates wIL, and in synchronization with this, the lower rotating chute 7 and the upper rotating chute 2 rotate W2 in the same direction at the same speed. As shown in FIG. 4, the relative positions of the upper rotating chute 2 and the lower rotating chute 7 are always maintained constant. In addition, FIG. 3 shows the operation of the upper rotating chute 2 and the lower rotating chute 7 and the raw material discharge position 39 when the relative positions of the upper rotating chute 2 and the lower rotating chute 7 are not constant due to the planetary gear mechanism.
It shows the relationship between According to this, the raw material discharge position 39 is located eccentrically from the first axis 37.

However, if the relative positions of the upper rotating chute 2 and the lower rotating chute 7 shown in FIG. It turns out. Since the raw material discharge position 39 is thus configured to be prevented from eccentrically shifting from the first axis 37, the raw material discharge position 39 can be easily aligned.

Further, by driving the second drive device 20, only the lower swing chute 7 rotates W2.

Furthermore, the first kaku vJ! Device 12 and second drive device 20
When driven simultaneously, the upper rotating chute 2 is rotated W1 by the first drive device 12, and the lower rotating chute 7 is driven by the second drive due to the relative relationship between the upper rotating chute 2 and the lower rotating chute 7! It is rotated W2 by the A position 20.

By the way, when changing the raw material discharge position 39 in multiple concentric circles as shown in FIG. 5, the upper swing chute 2 is continuously rotated W1 by the first drive device 12 as shown in FIG. 1(B). The position of the lower swing chute 7 is changed by the second drive device 20 every several rotations of the upper swing chute 2 to α in the figure.
, β, γ, the radii Rα, Rβ
, Rγ, three raw material discharge positions can be located in multiple concentric circles. This makes it possible to reduce particle size segregation of the raw material 9 in the furnace top bunker.

In addition, as shown in Fig. 6, there are multiple discharge ports q in the furnace top bunker b.
are formed, and different kinds of raw materials 9 are formed around these discharge ports q.
When charging, the upper swing chute 2 is rotated W1 by the first drive device 12 to adjust and fix the position of the second axis 38 above one of the discharge ports q. Next, the lower rotating chute 7 is continuously rotated W2 by the second drive device 20 to open each discharge port q.
Different kinds of raw materials 9 can be charged to the container. For example, from a hoisting device such as a conveyor, 01. Q2. g3. The different kinds of raw materials g transferred in the order of Q4 are transferred to the outlet of the furnace top bunker b (
11゜q2. q3. q4, and cut out the raw material 9 from the furnace top bunker b at gl, g2. (J3
．． (If the procedure is carried out in the order of 14, it is possible to charge the raw material while rotating the lower rotating chute 7 W2 when charging the raw material over time, and the segregation of the raw material 9 around each discharge port q of the furnace top bunker can be reduced. can be done.

Furthermore, when charging the raw material 9 to any position in the furnace top bunker, the positions of the upper rotating chute 2 and the lower rotating chute 7 are adjusted by the first drive device 12 and the second drive device 20. This improves the accuracy of controlling the falling point of the raw material 9.

[Effects of R-light] As described above, according to the present invention, the following excellent effects are exhibited.

(1) Appropriately change the mutual operation of the upper rotating chute, which is rotatably provided coaxially with the furnace top bunker, and the lower rotating chute, which is coaxially and rotatably provided with the lower discharge port of the upper rotating chute. By doing so, the 1iI material can be charged at any arbitrary position in the furnace top bunker, and segregation of raw material grains can be reduced.

(2) Since the raw material can be charged at any position in the furnace top bunker without tilting the chute as in the conventional method, the drive device can be downsized.

(3) The discharge port of the lower rotating chute is eccentrically formed so as to be inclined outward in the radial direction, so that the ejecting angle of the falling material is always constant, and the accuracy of controlling the falling point of the material is improved compared to the conventional tilting chute. can be improved.

[Brief explanation of the drawing]

FIG. 1 (A> is a block diagram showing an embodiment of the blast furnace raw material charging device of the present invention, and FIG. 1 (8) is an explanation showing the operation of one embodiment of the blast furnace raw material charging device of the present invention. Fig. 2 is a schematic diagram showing the planetary gear adopted in the blast furnace raw material charging device of the present invention, and Fig. 3 is a schematic diagram showing the planetary gear used in the blast furnace raw material charging device of the present invention. FIG. 4 is an explanatory diagram showing the raw material discharge position when the relative positions of the upper rotating chute and the lower rotating chute are kept constant, and FIG. 5 is an explanatory diagram showing the raw material discharge position of the raw material of the present invention. An explanatory diagram showing a first example of raw material charging by the charging device, FIG. 6 is an explanatory diagram showing a second example of raw material charging by the raw material charging device of the present invention, and FIG. 7 is an explanatory diagram showing the first conventional example. Schematic diagram shown in Figure 8 (A)
is a schematic diagram showing the second conventional example, and FIG. 8(B) is an explanatory diagram showing the operation of the second conventional example. In the figure, 1 is a raw material charging device, 2 is an upper rotating chute, 4 is an upper charging port, 5 is a lower discharge port, 7 is a lower rotating chute,
9 is a discharge port. Patent Applicant: Ishikawajima-Harima Heavy Industries Co., Ltd. Representative Patent Attorney Nobuo Kinutani Figure 1 Figure 4 Figure 5 Figure 6 Figure 7 Procedure Neho (Method) % Formula % 1. Indication of the case Tokugakusho No. 61-242167 2.
Name of 8 Mei Blast Furnace Raw Material Charging Device 3, Relationship with the Amendment Person Case Patent Applicant (009) Ishikawajima Harima Heavy Industries Co., Ltd. 4, Agent Postal Code 105 1-6-7 Atago, Minato-ku, Tokyo @ Showa January 27, 1962 (light transmission date) 6. Comparative specification of amendment (column for brief explanation of drawings) 7. Contents of amendment (1) [1st Figure (A> is...
...Construction diagram, and Fig. 1 (B) is an explanatory drawing.""Fig." is corrected.

Claims (1)

[Claims] Located between a top bunker installed above the blast furnace to charge raw materials into the blast furnace and a hoisting device installed above the top bunker to transfer the raw materials from a raw material source such as on the ground. The raw material charging device is rotatably provided on the same axis at the raw material inlet of the furnace top bunker, and the upper charging port opens facing the unloading end of the hoisting device, and the lower discharge port opens in the radial direction. An upper rotating chute is eccentrically provided so as to be inclined outward, and a lower outlet of the upper rotating chute is rotatably provided on the same axis, and the outlet is eccentrically provided so as to be inclined outwardly in the radial direction. A material charging device for a blast furnace, characterized in that it is equipped with a lower rotating chute.