JPH0213474Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a material charging device for a vertical furnace such as a blast furnace for iron-making, a shaft furnace, etc., and particularly to a bellless material charging device.

[Prior art and its problems]

In recent years, bellless type raw material charging devices have come to be widely adopted as raw material charging devices for, for example, blast furnaces for steel manufacturing.

As this bell-less raw material charging device, there is one having a structure as shown in FIG. 5, for example, as described in Japanese Utility Model Application No. 57-59850. In this material charging device, the fixed hopper has two stages of upper and lower fixed hoppers that are concentric with the reactor core, and charging material a is conveyed to the top of the furnace by a belt conveyor b, and from there to a rotating chute c. Therefore, once it is charged into the upper fixed hopper d, it is charged into the lower fixed hopper e, and from there it is transferred to the rotating chute g in the furnace.
It is designed to be charged into the furnace h by the following means.

In such a bellless raw material charging device, the raw material from a belt conveyor or the like is distributed to the upper fixed hopper via a rotating chute, the upper fixed hopper and the lower fixed hopper are arranged in series concentrically with the reactor core, The raw material discharged from these fixed hoppers is characterized by falling vertically, and generally has the advantage that it is easy to uniformize the particle size distribution of the raw material input into the furnace in the direction of the furnace circumference.

However, it is very difficult to adjust the particle size distribution in the furnace radial direction.

Even if the in-furnace rotating chute has a structure in which the tilting angle can be adjusted, it is not practical to carry out a coordinated operation of rotating and tilting because it is too complicated. This is because if there is no change over time in the particle size of the raw material charged from the belt conveyor to the upper fixed hopper, there is theoretically no need for such coordinated operation. Therefore, in the radial direction of the furnace, the ore/coke ratio cannot be sufficiently adjusted to be uniform.

[Problem that the invention attempts to solve]

The present invention focuses on the fact that the particle size distribution of the raw material charged into the furnace in the furnace radial direction in such conventional bell-less type raw material charging equipment is influenced by the history of the particle size distribution of the raw material in the upper fixed hopper. By arbitrarily adjusting the history pattern of the raw material particle size in the fixed hopper, taking into account the change over time in the particle size of the raw material charged into the upper fixed hopper, the raw material in the furnace radial direction in the furnace is The purpose is to adjust the particle size distribution as necessary.

[Means for solving problems]

This invention has a fixed hopper placed concentrically with the reactor core.
In a bell-less raw material charging device in which stages are arranged in series, a rotating hopper is provided at the upper part of the upper fixed hopper, and an in-furnace rotating chute is provided below the lower fixed hopper, a cylinder bent downward at the bottom of the rotating hopper is used. The rotary hopper is characterized in that a shaped chute is provided whose angle can be adjusted in the radial direction of the rotating hopper.

[Effect]

When charging the raw material from the furnace top loading device into the upper fixed hopper via the rotating hopper, the angle of the cylindrical chute is adjusted to take into account the change in particle size of the raw material over time and transfer the raw material into the upper fixed hopper. By adjusting the drop within or between batches, the particle size pattern over time of the raw material discharged from this fixed hopper can be adjusted to a pattern corresponding to the required particle size distribution of the raw material in the furnace radial direction within the furnace.

That is, it is well known that the order in which raw materials are discharged from the upper stationary hopper is determined by the position where the raw materials are deposited in the hopper d, and the raw materials are discharged in the order of A, B, and C, as shown in FIG. It is being

Therefore, by adjusting the average particle size of the raw material at each deposition position within the hopper, the particle size of the raw material discharged from the hopper over time can be adjusted.

The raw material from the upper stationary hopper is discharged vertically to the lower stationary hopper arranged concentrically in series, so the stacking form of the raw material discharged to the lower stationary hopper is almost the same as that of the upper stationary hopper. Since the raw materials are also discharged vertically, the discharge order is almost the same as in the case of the upper fixed hopper.

Therefore, changes over time in the particle size of the raw material discharged from the upper stationary hopper will be expressed in approximately the same way on the rotating chute, for example, the particle size distribution of the raw material from the upper stationary hopper will gradually increase over time. If the discharge order is set as follows, and the material is charged by tilting the rotating chute in the furnace in stages from the furnace wall side to the core side, the particle size distribution of the charged material in the radial direction of the furnace will change gradually from the core side to the furnace wall side. growing.

In particular, the cylindrical chute in the present invention has a downwardly bent shape, which eliminates the directionality of material falling from the rotating hopper and prevents it from spreading toward the furnace wall. You can also make it larger.

Therefore, it is possible to improve the accuracy of adjusting the position of the raw material falling from the rotating hopper to the upper stationary hopper.

〔Example〕

The present invention will be specifically explained below with reference to examples using FIGS. 1 to 3.

Reference numeral 1 designates an upper fixed hopper, and a rotating table 2 that can be freely rotated by a drive mechanism M is mounted on the upper part of the fixed hopper.This rotating table 2 is provided with a rotating hopper (swivel chute) 3.

One side of a downwardly bent cylindrical chute 4 is supported in the lower part of the rotating hopper 3 via an indicator pin 5 so as to be movable in the radial direction of the upper stationary hopper 1. Further, a link mechanism 7 connected to a drive mechanism M via a pin 6 is connected to the other side, and the angle of this cylindrical chute 4 is freely adjustable by the drive mechanism M.

That is, the outline of the drive mechanism M of the rotating hopper 3 and the cylindrical chute ₄ is as shown in FIG.
The gear 1 is rotatably supported by a bearing provided on the upper part of the gear 1, and the peripheral end surface of the gear 1 is provided with teeth.
It's turning 9. This gear 19 is the differential reducer 2
1 and meshes with a swing gear 22 connected to a swing motor 20 which rotates through a swing motor 20.

That is, the turning table 2 includes a turning gear 22 that is rotated by a turning motor 20 via a differential reduction gear 21.
The rotating hopper is rotated by the rotating table 2.
It is a structure that rotates with the robot.

Further, the link mechanism 7 connected to the cylindrical chute 4 is inserted into the hole ₂₀ of the turning table 2,
Its tip is fixed to the shaft of the worm gear 24. This worm gear 24 is engaged with a worm 25, and a gear 26 is provided on the shaft of this worm 25, and this gear 26 engages with the upper part of the turning ring ₂₁ of the turning table 2 to rotate a gear 27. meshes with the inner teeth of

The external teeth of this gear 27 are connected to the tilting motor 28.
This meshes with a tilting gear 23 which rotates via a differential reducer 21.

That is, the cylindrical chute 4 is connected to the tilting gear 2 which is rotated by the tilting motor 28 via the differential reducer 21.
3. It has a structure in which it can be tilted via a gear 26, worm gears 24 and 25, and a link mechanism 7.

In the figure, 10 and 12 are discharge valves, 11 and 13 are seal valves, 15 and 16 are pressure equalization devices, and 17 is a discharge valve.

In this way, the raw material a conveyed to the top of the furnace by the charging belt conveyor b is dropped to a desired position in the upper stationary hopper by the rotation of the rotating hopper 3 and the tilting of the cylindrical chute 4, where it is temporarily stored. Thereafter, the material is distributed and charged into the furnace via the lower fixed hopper 8 by rotating and tilting the in-furnace rotating chute 9.

The falling position of the raw material by the rotating hopper 3 and the cylindrical chute 4 is determined by taking into account the change over time in the particle size of each batch of raw material carried in by the charging belt conveyor b, and determines the position of the raw material required to be input into the furnace. The position is adjusted to obtain a time-dependent particle size pattern of the raw material from the upper fixed hopper, which is determined in accordance with the particle size distribution in the radial direction of the furnace. Therefore, even if the particle size of each batch of raw material carried in by the charging belt conveyor b changes over time, the particle size pattern of the raw material discharged from the upper fixed hopper over time can be adjusted to the desired pattern. be able to.

Therefore, by the general rotation and tilting of the in-furnace rotating chute 9 via the lower fixed hopper 8, the particle size distribution of the raw material fed into the furnace, particularly in the radial direction of the furnace, can be easily adjusted.

In addition, it is easy to arbitrarily adjust the furnace conditions by adjusting the gas flow distribution and stabilize the furnace operation.

In this embodiment, a cylindrical chute 4 is provided at the lower part of the chute part of the revolving hopper 3 so that the tilting angle can be adjusted freely.The chute part of the revolving hopper and the cylindrical chute are integrated, and this chute part can be freely adjusted in the tilting angle. You may also do so. Therefore, these drive mechanisms are not limited to those of this embodiment.

FIG. 3 shows another embodiment of the present invention. In this embodiment, a rotating hopper having a cylindrical chute whose tilt angle can be adjusted is provided in the upper fixed hopper, and a material flow adjustment is provided in the lower fixed hopper. Member 29
The position can be freely adjusted.

In this embodiment, the deposition form of the raw material is also adjusted in the lower fixed hopper 8, and the lower fixed hopper 8 is
Since the particle size pattern of the raw material discharged from the furnace can be adjusted over time, compared to the case of the above embodiment in which only the deposition form in the upper fixed hopper was adjusted, it is possible to adjust the grain size pattern of the raw material discharged from the lower fixed hopper. The particle size pattern of the raw material discharged over time can be adjusted more precisely.

[Effect of idea]

In this invention, since the particle size pattern over time of the raw material discharged from the upper stationary hopper can be adjusted arbitrarily, it is possible to adjust the particle size pattern over time of the raw material discharged into the rotating chute in the furnace via the lower stationary hopper. becomes.

Therefore, the particle size distribution of the raw material input into the furnace can be easily adjusted by the in-furnace rotating chute, and the furnace condition can be easily adjusted by adjusting the particle size distribution of the raw material, so that stable operation of the furnace can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional explanatory diagram showing one embodiment of the present invention, FIG. 2 is a detailed cross-sectional diagram of the M section in FIG. 1, and FIG. 3 is a vertical cross-sectional explanatory diagram showing another embodiment of the present invention. , FIG. 4 is an explanatory diagram showing the stacking position and discharge order of raw materials in the hopper, and FIG. 5 is a longitudinal cross-sectional explanatory diagram showing an example of a conventional raw material charging device. 1: Upper fixed hopper, 2: Swivel table,
3: Rotating hopper, 4: Cylindrical chute, 5: Support pin, 6: Pin, 7: Link mechanism, 8: Lower fixed hopper, 9: Furnace rotating chute, 19: Gear,
20: Swing motor, 21: Differential reducer, 22: Swing gear, 23: Tilting gear, 24: Worm gear,
25: Worm, 26: Gear, 27: Gear, 2
8: Tilt motor.

Claims (1)

[Scope of utility model registration request] Fixed hoppers are installed in two stages, upper and lower, concentrically with the reactor core.
In a bell-less raw material charging device that has a rotating hopper above the upper hopper and an in-furnace rotating chute below the lower fixed hopper, a cylindrical chute that bends downward is installed at the bottom of the rotating hopper above the upper fixed hopper. A raw material charging device for a vertical furnace characterized by a hopper that can be freely adjusted in angle in the radial direction.