JPH0633349Y2 - Atmospheric shutoff device for continuous sintering machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an atmospheric shutoff device for a continuous sintering machine, which shuts off the air that enters the wind box from the front and rear of the pallet traveling direction.

(Prior Art) As a continuous sintering machine for producing a sintered ore, for example, a Dwightroid type sintering machine is well known.

One of the most important points in such a sintering machine is how to reduce air leakage.

That is, this sintering machine sucks air from a lower side of a pallet, which is loaded with a raw material in which pelletized iron ore and powder coke are mixed and advances, through a wind box by an exhaust fan (not shown). However, air is passed through the raw material to burn the coke, and the raw material is sequentially burned in the lower layer direction to produce a sinter, so that the pallet and the wind box can be reliably shut off. Desirably, various atmospheric shutoff devices are being invented.

Of such an atmosphere blocking device, two examples of an atmosphere blocking device for blocking the entry of air from the front and rear in the traveling direction of the pallet will be described with reference to FIGS. Introduced below.

That is, the atmosphere shutoff device of the first example is called a fixed type, and as shown in FIG. 3, it is located between the lower surface of the main girder (51) of the pallet that supports the great bar (not shown). Has a gap (d) in consideration of thermal deformation of the main girder (51), a dead plate (52) is provided in parallel with the pallet, and one end of the dead plate (52) has a wind box (53). It is configured to be joined to the upper edge of.

Therefore, when the air is sucked through the wind box (53) by the air blower, the air existing above the raw material loaded on the pallet is sucked through between the raw material particles.

Further, the atmosphere shutoff device of the second example is called a weight type, and as shown in FIG. 4, one end side of the U-shaped seal (64) having a U-shaped cross section has a main girder (61 ) Bottom surface and gap
This U-shaped seal is fixed to the end face of the dead plate (62) below the main girder (61) provided with (d).
The outer surface of the lip on the other end of (64) is the wind box (63).
The window box (63) and the end surface of the dead plate (62) are cut off by abutting against the outer surface of the upper edge of the dead plate (62).

Further, at the lower part of the dead plate (62), one ends of two parallel links (66) are pin-connected, respectively, and the other ends thereof are inclined so that they are on the seal (64) side. Each of the central portions is swingably supported by the support frame (65).

Also, the other end side of these two links (66) is a horizontal link (67).
The horizontal link (67) has a weight (68) hanging at the center thereof, which generates a force toward the seal (64) side with respect to the dead plate (62). It has become.

Therefore, the atmospheric shutoff device of the second example has the same atmospheric shutoff performance as the atmospheric shutoff device of the first example.

In addition to the above atmosphere shutoff device, a seal fixed to the end surface of the dead plate is called a spring type in which the spring force of the coil spring presses the seal against the outer surface of the upper edge of the wind box. There is also an air shutoff device that has the same structure.

(Problems to be solved and used by the invention) Although the above-described conventional air shutoff devices are often used in continuous sintering machines, from the viewpoint of air shutoff performance, they are still as described below. I have a problem.

That is, it is well known that the pallet usually receives a temperature history of 200 to 600 ° C. at intervals of 40 to 60 minutes because the powder coke in the raw material burns during sintering. Therefore, since the main girders of the pallet are deformed by thermal strain, as described above, in consideration of this thermal deformation, there is a gap between the lower surface of the main girder and the upper surface of the dead plate that does not hinder the progress of the pallet. It is provided. Therefore, when sucking air with an exhaust fan,
The air present above the raw materials loaded on the pallet is sucked through the inside of the raw material layer, and also the air is sucked into the wind box through the gap. In other words, the air sucked through this gap cannot contribute to the combustion of the powder coke at all. However, there is a problem in that sufficient air for sintering the raw material must be passed through the raw material layer, and wasteful drive power must be supplied to the exhaust fan.

Also, in the atmosphere shutoff device having a U-shaped seal,
In order to press the outer surface of the lip of the U-shaped seal attached to the end surface of the dead plate against the outer surface of the upper edge of the wind box, a plurality of linkage mechanisms including weights or springs are provided in the width direction of the pallet. There is a problem in that the structure of the atmosphere shutoff device itself is inevitably complicated because a group must be provided.

Therefore, the present invention solves the above-mentioned problems and improves the front-rear direction air barrier performance to enable energy saving and provide an atmosphere barrier device for a continuous sintering machine having a simple structure. With the goal.

(Means for Solving the Problem) The atmosphere shutoff device according to the present invention can be provided by closing the gap between the lower surface of the main girder and the upper surface of the dead plate, which must be provided for thermal deformation due to thermal strain. Therefore, the feature of the atmosphere shutoff device of the present invention is that it has a plurality of parallel main girders in the lower part and is orthogonal to these main girders. Provided on the lower side of the pallet and before and after the pallet in the moving direction of the wind box of the continuous sintering machine having a wind box for sucking air interposed above the pallet. And a bottom plate of the main girder, wherein the dead box is provided with a gap in consideration of thermal deformation of the main girder. Between And a plurality of leaf springs are fixed to the upper edge portion of the box in a direction orthogonal to the traveling direction of the pallet so that the end faces in the width direction of the box springs can be brought into sliding contact with each other. A seal plate that can come into contact with the lower surface of the main girder is fixed to the upper end portion so that the end faces in the width direction can be brought into sliding contact with each other.

(Operation) In the present invention, since the structure of the atmosphere shutoff device is configured as described above, the seal plate is pressed against the lower surface of the main girder of the pallet by the spring force of the leaf spring, and this pressing force shuts off between the lower surface of the pallet and the seal plate. To be done.

Further, the widthwise end faces of the leaf springs are configured to be able to slide alternately, and the widthwise end faces of the seal plate are configured to be slidable alternately, so that the seal plate is formed by the spring force of the leaf springs. Follows the deformation of the bottom surface of the pallet due to thermal strain.

The amount of movement of the leaf spring and the seal plate in the thickness direction due to the movement of the pallet is gradually increased by the plurality of leaf springs and the seal plate arranged at the upper edge of the wind box in the direction of movement of the pallet. Since they are taken care of, there is no discrepancy between leaf springs or seal plates.

(Embodiment) An embodiment of the atmosphere shutoff device of the present invention will be described below with reference to FIG. 1 which is a side sectional view of a main part thereof and FIG. 2 which is a longitudinal sectional view thereof. However, the structure of the atmosphere blocking device provided before and after the wind box pallet in the traveling direction is the opposite structure, so only one will be described.

That is, reference numeral (1) shown in FIG. 1 and FIG. 2 is a pallet, and the pallet (1) is parallel to the bottom of the pallet (1) in a direction orthogonal to the traveling direction of the pallet (1). A plurality of main girders (1a) arranged, a plurality of great bars (1b) installed between adjacent main girders (1a), and pallets (1) on both sides of the main girder (1a) in the longitudinal direction. It consists of a side frame (1c) that is erected in the direction of travel, and a raw material (11) that is a mixture of iron ore and powder coke on the great bar (1b) of this pallet (1). Is loaded. Then, below the pallet (1), there is disposed a wind box (2) through which combustion gas sucked by an exhaust fan (not shown) passes, and before and after the pallet (1) in the traveling direction. A dead plate (3) having a gap (d) in consideration of the deformation of the main girder (1a) due to thermal strain is formed between the wind box (2) and the lower surface of the main girder (1a). It is arranged parallel to the main girder (1a).

Between the wind box (2) and the dead plate (3), the pallet (1) is parallel to the pallet (1).
The seat plate (4) having a plurality of ventilation holes (4a) long in the width direction of the pallet (1) in three rows with respect to the traveling direction of (1) is installed, and the ventilation holes (4) of the seat plate (4) ( One end of each of a plurality of leaf springs (5) is fixed to each of the upper surfaces of the pallets (1) near the traveling direction of the pallets (1) in the width direction of the pallets (1). These leaf springs (5) are arranged in an inclined state, and the end faces in the width direction can be brought into sliding contact with the opposite end faces of the adjacent leaf springs (5). Furthermore, the flat part (5a) parallel to the lower surface of the pallet (1) above these leaf springs (5) has the upper surface of the main girder (1a) due to the spring force of this leaf spring (5). The seal plate (6) pressed against the lower surface is fixed with bolts (6a),
The end faces in the width direction of these seal plates (6) are configured to be capable of sliding contact with each other.

By the way, in this embodiment, the leaf spring (5) and the seal plate (6)
As can be seen from the figure, the assembly consisting of
There are three rows. This is, for example, in the figure
Assuming that (1) is traveling to the left, before the main girder (1a) is disengaged from the underside of the main girder (1a) with the seal plate (6) on the left side in FIG. , Right main girder (1a)
The right side seal plate (6) is in contact with the lower surface of the main girder.
(1a) It is a consideration for making the seal plate (6) better follow the deformation of the respective lower surfaces. Of course, the number of rows of the assembly may be two rows or less, or four rows or more, but if it is, for example, one row, the followability to the deformation of the lower surface of each of the main girders (1a) is poor, and the air leakage prevention function deteriorates, and four rows Since the above is disadvantageous in terms of cost, the number of rows is set in consideration of the leakage prevention function and the cost.

Further, a seat plate corresponding to the opening position of each of the ventilation holes (4a)
A discharge pipe in which three dust chutes (7) communicating with the ventilation holes (4a) are provided on the lower surface side of (4), and an opening / closing valve (9) is provided on the lower side of the dust chutes (7). (8) is connected, and the lower side of this discharge pipe (8) is connected to the wind box.
The configuration is such that it is connected to the collecting and discharging pipe (10) communicating with the duct (2a) below the (2).

The purpose of installing the dust chute (7) is to pass between the great bars (1b) and to seal the three rows of seal plates.
(6) Leakage (12) etc. falling between the two is automatically discharged to prevent the accumulation of leaky (12) etc. on the upper surface of the seat plate (4), This is to prevent the movement of the leaf spring (5) from being obstructed by (12) or the like.

By the way, since the ventilation hole (4a) is configured to be closed by a removable cover, the cover may be removed as needed or periodically to remove the accumulated leaked minerals, etc. The dust chute (7) is not always necessary.

Next, the operation of the atmosphere shutoff device having such a configuration will be described.

The negative pressure inside the wind box (2) when sucked by the blower, so the raw materials (11) loaded on the pallet (1)
The air present near the upper part of the is sucked through the gaps between the particles of the raw material (11), and the ignition furnace (not shown)
The powder coke ignited by is burned, and the combustion heat at this time sinters the raw material (11). Then, during sintering, deformation occurs due to the combustion heat of the powder coke on the lower surface in the width direction of the main girder (1a), but the leaf spring (5) follows such deformation. Since the upper surface of the seal plate (6) is pressed against the lower surface of the main girder (1a), the lower surface of the main girder (1a) and the seal plate (6) are shut off from each other.

On the other hand, air is the bottom surface of the main girder (1a) and the dead plate (3).
While flowing into the dust chute (7) through the gap (d) between the two, the end faces of the leaf springs (5) of the plurality of assemblies can be slidably contacted with each other. Seal plates (6)
Since the end surfaces of the two springs are also configured to be capable of sliding contact with each other, the air flowing in through the gaps (d) passes between the sliding contact surfaces of the leaf springs (5) and the seal plates (6). It rarely flows into the wind box (2).

By the way, these leaf springs (5) and seal plates (6) are the main girders (1a).
It is conceivable that when following the deformation of No. 1, the air in the dust chute (7) flows into the wind box (2) due to a gap in the plate thickness direction due to the discrepancy. Regarding this point, a plurality of leaf springs (5) are arranged in the width direction of the pallet (1).
And the seal plate (6) are arranged to reduce the amount of movement each leaf spring (5) and the seal plate (6) take to reduce the gap between the end faces of the adjacent leaf springs (5) and the seal. Care is taken not to cause a discrepancy between the end faces of the plate (6).

On the other hand, as described above, leakage occurred between the Great Bars (1b).
(12) etc., and if these leaks (12) etc. are deposited on the upper surface of the seat plate (4), the movement of the leaf spring (5) is obstructed by the accumulated leaks (12) etc. If the ore (12) falls from the ventilation hole (4a) and accumulates a predetermined amount on the bottom of the dust chute (7),
The accumulated leaked ore (12) and the like are passed through the discharge pipe (8) and the collection and discharge pipe (10) by opening the open / close valve (9), and are sucked by a blower to the bottom of the wind box (2). Is discharged to the outside through the duct (2a) communicating with the blower from the side. In addition, when the leakage ore (12) is being discharged from the dust chute (7), the air flowing in from the gap (d) between the upper surface of the dead plate (3) and the lower surface of the main girder (1a) is Since it flows into the duct (2a) at the lower part of the wind box (2), it has the same atmospheric barrier performance as the conventional one.

However, during normal sintering work that does not discharge leakage ore (12), etc., the production of sintered ore equivalent to that of a conventional sintering machine equipped with an atmospheric shutoff device can be achieved by operating the blower with less power than before. Can be secured.

(Effects of the Invention) As described above, according to the present invention, the seal plate is pressed against the lower surface of the main girder of the pallet by the spring force of the leaf spring, and the pressing force disconnects the lower surface of the main girder from the seal plate. To be done.
Further, since the end faces of a plurality of assemblies composed of leaf springs and seal plates are arranged in the width direction of the pallet so that they can be slidably contacted with each other, the lower surface of the main girder caused by the progress of the pallet. The seal plate follows the movement of the plate spring by the spring force of the plate spring, and the amount of movement generated in the thickness direction of the plate spring and the seal plate due to the progress of the pallet is gradually taken over by the plate spring and the seal plate. Therefore, a gap is not created based on the discrepancy in the plate thickness direction.

Therefore, as a result of reducing the amount of air flowing in between the seal plate and the lower surface of the pallet, and between the adjacent leaf spring and the end surface of the seal plate, it becomes possible to operate the exhaust fan with less electric power than before, Further, since the structure is composed of the leaf spring and the seal plate, the structure can be made simpler than that of the conventional air shutoff device having a plurality of weight type or spring type linkage mechanisms.

Therefore, it is possible to realize energy saving, and to realize an atmosphere shutoff device for a continuous sintering machine which has a simple and extremely excellent structure and is useful.

[Brief description of drawings]

1 is a side sectional view of an essential part of an embodiment of the present invention, FIG. 2 is a vertical sectional view of an essential part of an embodiment of the present invention, and FIG. The figure is an explanatory view of a main part configuration of a second conventional example. (1) …… pallet, (1a) …… main girder, (2) …… wind box, (3) …… dead plate, (4) …… seat plate, (4a) ……
Ventilation hole, (5) …… leaf spring, (6) …… seal plate, (7) …… dust chute, (8) …… exhaust pipe, (9) …… open / close valve, (10)…
… Intake and exhaust pipe, (11) …… raw material, (12) …… leakage, (d) …… gap.

Claims (1)

[Scope of utility model registration request] 1. A pallet having a plurality of parallel main girders in its lower part and advancing in a direction orthogonal to these main girders, and sucking air existing above the pallet below the pallet. It is provided in front of and behind the pallet in the traveling direction of the wind box of the continuous sintering machine equipped with a wind box, and is provided with a gap between the lower surface of the main girder and the thermal deformation of the main girder. In an atmosphere shutoff device for a continuous sintering machine, which comprises a dead plate, a plurality of upper edge portions are provided between the wind box and the dead plate and in a direction orthogonal to the traveling direction of the pallets of the box. Of the leaf springs are fixed so that the end faces in the width direction thereof can be slidably contacted with each other, and the upper end portion of each of the leaf springs is provided with a seal plate capable of contacting the lower surface of the main girder. Can slide into Atmosphere shutoff device a continuous sintering machine, characterized in that fixed to.