JPH08145573A - Material charging device for sintering machine - Google Patents

Abstract

PURPOSE: To provide a material charging device for a sintering machine which is capable of fixing the thickness of a material layer formed on a pallet. CONSTITUTION: A material charging device is constituted of a material supplying machine 1, a screen type chute 3, assembled by a linear member 20 and a guide member 21, and a cut-off plate 41, arranged at the downstream side of the advancing direction of a pallet 40, while a scraper 30, having a plurality of V-shape scraping diodes 32, is installed between the chute 3 and the cut-off plate 41 so that the tip ends of the scraping diodes 32 are faced toward the chute 3. Upon charging material from the chute 3 onto the pallet 40, a trough, in which the thickness of a material layer is thin, is provided in the layer of material at a place, whereat the guide member 21 exists, however, the tip ends of the scraping diodes 32 of the scraper 30 scrapes the material at the place, whereat the thickness of the layer is thick, to the left-and-right from the center of the tip end of the scraping diodes 32 while the scraped material fills up the trough whereby the material layer, having no variety in the thickness thereof, can be formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a raw material charging device for a sintering machine for continuously producing sintered ore, calcined agglomerated ore and the like.

[0002]

2. Description of the Related Art When producing a sinter, a raw material is prepared by mixing coke powder and lime powder having an appropriate particle size with iron ore of about 10 mm or less, and the raw material is placed on a pallet of a moving sintering machine. Charge. Next, the coke on the surface of the raw material charged in the pallet is ignited, the coke is burned while sucking air from the lower side of the pallet, and the iron ore is sintered by the heat of combustion.

At the time of charging the raw material, the raw material layer deposited in the pallet has a special particle size distribution. That is, a raw material of coarse particles is present at the bottom of the raw material layer,
The fine-grained raw material is allowed to exist thereon to segregate the grain size distribution in the thickness direction, thereby improving the air permeability of the raw material layer.

A raw material charging apparatus developed for segregating the particle size distribution of the raw material layer as described above is disclosed in Japanese Patent Laid-Open No. 5-1335.
No. 6,086,045. FIG. 4 is a schematic sectional view of the device.

In the figure, 1 is a belt feeder as a raw material feeder, 2 is a guide chute, 3 is a screen chute, 40 is a pallet of a sintering machine, 41 is a cut-off plate, which is below the pallet 40. The arrow attached indicates the moving direction of the pallet. Further, 50 indicates a raw material and 51 indicates a raw material layer.

The screen type chute 3 is provided in series with the guide chute 2 and is inclined in a direction opposite to the moving direction of the pallet 40. The detailed structure of the screen type chute 3 is as shown in FIGS. FIG. 5 is a schematic front view of the screen type chute, and FIG. 6 is a side view thereof. In this screen type chute 3, linear members 20 such as rods and wire ropes are arranged at intervals in the vertical direction, and the linear members 20 are assembled like a blind by a guide member 21 to form a screen shape. Has been done. The interval between the arranged linear members 20 is wider in the lower portion 3b than in the upper portion 3a, and gradually increases toward the lower portion. Also, this screen-type shoot 3
Is curved downward, and has a bow shape when viewed from the side. Therefore, the inclination angle of the screen type chute 3 is large in the upper part and small in the lower part.

A state in which the raw materials are charged into the pallet by the charging device having the above-mentioned structure will be described. A predetermined amount of raw material supplied from the belt feeder 1 drops onto the screen type chute 3 via the guiding chute 2. The raw material that has dropped onto the screen type chute 3 is charged and accumulated in the moving pallet 40 to form a raw material layer. In the process of charging the raw material by the screen type chute 3, first, the fine particles in the raw material are sieved off in the vicinity of the upper part 3a of the chute where the interval between the linear members is narrow, and the slope of the raw material already deposited (accumulated. It falls to the end of the raw material). Next, the coarse particles are sieved off near the lower part 3b of the chute where the spacing between the linear members is wide, and fall on the raw material slope before the fine particles are deposited. Then, large particles that have not been sieved off even in the lower part 3b of the chute having a wide interval between the linear members fall from the lower end of the screen type chute 3 and are spread on the pallet 40. In this way, the coarse particles are present in the lower part of the raw material layer and the fine particles are present in the upper part, and the raw material layer having a particle size distribution segregated in the thickness direction is formed.

[0008]

In the above-mentioned prior art, the chute 3 for charging the raw material into the pallet 40 has a screen-like shape, and the raw material is classified at the respective positions (fine particles are on the top, Since the coarse particles are charged (below), a raw material layer having a particle size distribution segregated in the thickness direction is formed.
However, the screen chute 3 is provided with a guide member 21 for vertically assembling a large number of linear members 20 in a blind shape, and since the guide member 21 is provided, it is formed on the pallet 40. There arises a problem that the thickness of the formed raw material layer is not constant.

That is, as shown in FIG. 7, the raw material falls from the screen type chute 3 and is deposited on the pallet 40. At this time, the raw material in the vicinity of the guide member 21 drops on both sides thereof. Therefore, the amount of the raw material deposited directly under the guide member 21 is reduced, and the raw material layer 51 has a valley portion (groove) 52 having a thin layer thickness. Therefore, the suction of the outside air is concentrated in the valley portion 52 having a small ventilation resistance, and the burning speed of the coke powder in the combustion zone is different between the valley portion 52 and other portions. You can The formation of this unburned portion causes problems such as a decrease in yield, a decrease in quality, and an increase in the unit of coke.

The present invention has been made in order to solve such a problem, and provides a raw material charging device for a sintering machine which can make the thickness of a raw material layer formed on a pallet constant. The purpose is to provide.

[0011]

SUMMARY OF THE INVENTION In the present invention, a scraper having a plurality of V-shaped scrapers between a screen chute and a cutoff plate has a tip of the scrapers directed toward the screen chute. It is installed towards.

In one aspect of the scraper, the scraper is configured to be movable up and down based on a level signal of a raw material layer level meter provided above the pallet.

[0013]

As described above, when the raw material falls from the screen type chute and is deposited on the pallet, a valley portion having a thin layer thickness is formed at a position below the guide member of the chute, but the scraper is provided. When this is done, the raw material in the thick layer is scraped to the left and right around the tip of the scraping body, and the scraped raw material fills the valleys of the raw material layer, forming a raw material layer with uniform thickness. It

If the scraper configuration is raised or lowered according to the level of the raw material layer, the height of the scraper can be increased even if the layer thickness changes due to fluctuations in the raw material supply amount or changes in the raw material supply amount setting. By changing the amount, the scraping amount of the raw material is adjusted to an appropriate amount, so that the variation of the raw material layer thickness caused by the excessive or excessive scraping amount is prevented.

[0015]

1 is a schematic sectional view showing an embodiment of the present invention. In FIG. 1, the same components as in FIG. 4 are assigned the same reference numerals and explanations thereof are omitted. In this embodiment, the screen chute 3 and the cutoff plate 4 are used.
A scraper 30 is installed between the two. The scraper 30 is configured to move up and down based on a level signal from an ultrasonic type raw material layer level meter 36 provided above the pallet 40.

FIG. 2 is a plan view showing the structure of the scraper. In this figure, 30 is a scraper, and 1
Is a belt feeder as a raw material feeder, 3 is a screen type chute, and 40 is a pallet. The scraper 30 has a V-shaped scraping body 3 formed by bending a plate.
Two or more are attached. This scraping body 32 is V
The tip end of the character shape is directed toward the screen type chute 3, and the tip end is arranged at the downstream portion between the guide members 21 of the chute 3. The scraper 30 has racks 33 attached to both ends of a pedestal 31, and is rotated up and down by rotating a gear 34 that meshes with the racks 33 to adjust the height thereof. Reference numeral 35 is a rotation shaft of the gear. Further, the scraping body 32 has a hinge-like structure at its tip.
The V-shaped angle is adjustable.

FIG. 3 is a perspective view showing a state where raw materials are charged by the apparatus shown in FIG. In FIG. 3, FIG.
The description of the items already described in 1 is omitted. The tip of the scraping body 32 faces in the direction opposite to the moving direction of the raw material layer (moving direction of the pallet 40), and at the portion where the layer thickness of the raw material layer is large (at the downstream portion of the portion where the guide member 21 of the chute 3 does not exist). , The raw material at this portion is scraped to the left and right around the tip of the scraping body 32, and the raw material layer scrapes the valley portion 52 of the raw material layer. Therefore, the thickness of the raw material layer becomes constant.

When the amount of raw material supply changes and the layer thickness changes, the scraper 30 is lifted by an elevator (not shown).
The height of is adjusted. Then, the amount of the raw material that is stopped by the scraping body 32 and distributed to the left and right is the valley portion 5.
It is adjusted so that it is almost the same as the filling amount of 2. The scraping amount of the raw material by the scraping body 32 is the scraper 30.
This is done by adjusting the height of. The height of the scraper 30 is controlled based on the calculation result of the measured values by the plurality of level gauges 36a, 36b, 36c arranged between the chute 3 and the scraper 30.

Further, when the range for scraping the raw material layer is not appropriate and the valley portion is not sufficiently filled or the amount of raw material moving to the valley portion is too large, the scraping body 32 is V-shaped. Change the angle of and adjust appropriately.

Next, the operation results of charging the raw materials by the apparatus described in FIGS. 1 to 3 will be described. This operation was carried out at a raw material supply rate of 950 T / H. The dimensions of the device used were as follows.

Screen-type chute Width 7,500 mm Number of guide members 6 Scraper scraper arrangement number 5 Width W 800 mm to 1200 mm (adjustable range) Angle α 40 ° to 60 ° (adjustable range) Regarding the above operation results, FIG. 8 shows the air permeability of the raw material layer, and Table 1 shows specifications such as the quality of the sintered ore, the yield, and the unit of coke. The air permeability here is defined as a flow through a unit volume of raw material under a certain pressure gradient, and is a value obtained by the following equation.

[0022]

[Equation 1]

In order to compare the results according to the present invention with the results according to the prior art, the air permeability of the raw material layer when the conventional apparatus is used is shown in FIG. 9, and the operating specifications are also shown in Table 1.

First, comparing the air permeability with reference to FIGS. 8 and 9, in the raw material layer according to the prior art, the air permeability of the valley portion formed immediately below the guide member of the screen type chute and having a small layer thickness and other than that. Whereas the difference in air permeability between portions, that is, the difference between the maximum and minimum values of air permeability in the width direction of the pallet was about 0.2 to 0.4, in the raw material layer of the present invention, the guide Since the valley is not formed directly below the member, the difference between the maximum and minimum values of air permeability is approximately 0.1 to 0.2.
And decreased to 1/2.

Then, as shown in Table 1, the quality (cold strength) and yield of the sintered ore was significantly improved, and the basic unit of coke was also reduced.

[0026]

[Table 1]

[0027]

According to the present invention, a scraper having a plurality of V-shaped scrapers is installed between the screen chute and the cut-off plate with the tip of the scrapers directed toward the screen chute. The material in the thick layer is scraped to the left and right around the tip of the scraping body, and the scraped material fills the valleys of the raw material layer, resulting in uneven thickness. No raw material layer is formed.

When the raw material is charged by the apparatus of the present invention,
The difference in the air permeability of the raw material layer becomes extremely small, the quality and yield of the sintered ore are greatly improved, and the unit of coke is also reduced.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing one embodiment of the present invention.

FIG. 2 is a plan view showing a structure of a scraper in the apparatus shown in FIG.

FIG. 3 is a perspective view showing a state where raw materials are being charged by the apparatus of FIG.

FIG. 4 is a schematic sectional view of a conventional raw material charging device.

FIG. 5 is a schematic front view of a screen chute.

FIG. 6 is a schematic side view of a screen chute.

FIG. 7 is a diagram schematically showing a raw material layer formed by a conventional device.

FIG. 8 is a diagram showing the air permeability of a raw material layer when the present invention is used.

FIG. 9 is a diagram showing the air permeability of a raw material layer when a conventional device is used.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Raw material supply machine 3 Screen type chute 20 Linear member 21 Guide member 30 Scraper 31 Frame 32 Scrapers 36, 36a, 36b, 36c Raw material layer level meter 40 Pallet 41 Cutoff plate 50 Raw material 51 Raw material layer 52 Raw material layer Tanibe

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Takashi Watanabe 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd.

Claims (2)

[Claims] 1. A raw material feeder, a chute for charging the raw material fed from the raw material feeder into a pallet, and a cut-off plate arranged downstream of the chute in the traveling direction of the pallet. In the raw material charging device of the sintering machine, wherein the chute is a screen-type chute assembled by a linear member and a guide member, and the guide members are arranged in the width direction at intervals, A scraper having a plurality of V-shaped scrapers is installed between the chute and the cut-off plate with the tip of the scrapers directed toward the chute, and the raw material device of the sintering machine. Input device. 2. The raw material charging of a sintering machine according to claim 1, wherein the scraper is configured to be vertically movable based on a level signal of a raw material layer level meter provided above the pallet. apparatus.