JP3889142B2 - Raw material breathability homogenizer in the width direction of a sintering machine and method for producing a sintered ore - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention, subscription of the sintering machine - down type shoe - leveling device and sintering of the sintered material surface portion to eliminate the groove filling pallet width direction of breathable variation in the upper portion of the sintering material layer caused by Doo The present invention relates to a method for producing the ore .
[0002]
[Prior art]
For the purpose of improving the air permeability of the entire raw material layer by depositing coarse raw material at the bottom of the pallet and fine raw material at the top when charging the sintering raw material (hereinafter simply referred to as raw material) onto the sintering machine pallet A developed raw material charging apparatus is disclosed in Japanese Patent Laid-Open No. 5-1335. This apparatus is a screen type shunt composed of a linear member such as a wire and a guide member for supporting the linear member. This guide member is provided at several locations in the pallet width direction. However, since the flow of the raw material is obstructed, the amount of raw material deposited immediately below the guide member is smaller than other parts, and a thin groove is formed in the raw material layer. it can. Since this groove is formed by the flow of the surrounding raw material, the raw material density is also reduced. In the raw material layer thus formed, the air permeability of the groove portion is higher than that of other portions in the pallet width direction, and the air permeability in that direction varies. When it becomes larger, an unburned portion of the coke is generated, which causes problems such as a decrease in sintering yield, a decrease in quality, and an increase in the basic unit of coke.
[0003]
In order to solve this problem, the present inventors have proposed a scraper having a plurality of V-shaped scrapers between a screen-type shunt and a cut-off plate. (Japanese Patent Application No. 8-93944).
[0004]
Moreover, in the pallet width direction, as a device that can adjust the raw material thickness without increasing the density of the surface layer portion of the charged raw material, a pair of screw blades whose height and inclination angle can be adjusted above the pallet in the pallet width direction. An apparatus provided on the other hand is disclosed (Japanese Patent Laid-Open No. 8-136152).
[0005]
[Problems to be solved by the invention]
In the scraper having a V-shaped scraping body of Japanese Patent Application No. Hei 8-93944, the scraping body is fixed, so that the bulge of the raw material is always formed on the front surface of the scraping body. . For this reason, a smooth surface can be formed in the width direction of the pallet. However, a pressure is applied from above directly below the raw material bulge portion on the front surface of the scraping body, resulting in density variations in the width direction. As a result, the problems of generation of an unfired portion (short for an unsintered portion), a decrease in yield, a decrease in quality, and an increase in the basic unit of coke remain.
[0006]
Moreover, when the screw blades of JP-A-8-136152 are used as a scraping body, the raw material is scraped from the center of the pallet to both ends, so that the groove is filled without applying pressure to the raw material surface layer to form a smooth surface. However, in this case as well, the low-density region in the vicinity of the groove remains, and thus the density variation in the width direction becomes small but does not disappear.
[0007]
The present invention fills the grooves generated by the screen type shout to form a smooth surface and eliminates the low density region generated in the vicinity of the grooves, thereby making the charging density in the width direction uniform. An object of the present invention is to provide a device for making the air permeability of the raw material layer uniform and a method for producing a sintered ore .
[0008]
[Means for Solving the Problems]
The present invention achieves the above object by the following apparatus or the like .
[0009]
The first apparatus is a screw type having a rotating shaft provided between the screen type shunt of the sintering machine and the ignition furnace and on the sintering raw material layer and extending in the width direction of the pallet. A raw material permeability uniformizing device in the width direction of a sintering machine equipped with a raw material scraping blade, wherein the screw type raw material scraping blade moves up and down, and the screw type raw material scraping blade rotation speed changing device. The screw-type raw material scraping blade is opposite to the left and right with the guide member that supports and guides the screen-type shunt directly above the groove formed on the sintered raw material layer. Uniform air permeability in the width direction of the sintering machine, characterized in that spiral blades that fill the wound groove and further form a raised portion with raised raw material at the groove position are attached to the rotating shaft facing each other. Device.
[0010]
The second device is a material permeability uniformizing device in the width direction of the sintering machine, which includes a vertical movement device for a screw-type raw material scraping blade and a rotation speed changing device for the scraping blade in the first device. is there.
[0011]
The third device is a material permeability uniformizing device in the width direction of the sintering machine in which the first device or the second device is provided with a cut-off plate downstream of the screw-type material scraping blade.
[0012]
"Action"
First invention: A screw-type raw material scraping blade is formed in a groove formed at a fixed position in the pallet width direction immediately below the guide member in the process of charging the raw material onto the pallet through the screen type shunt. The spiral is wound so that the raw material is conveyed to the groove position by rotating the shaft, and the biting depth of the scraping blade into the raw material layer and the number of rotations are determined according to the size of the groove and the pallet speed. If this apparatus is operated, the groove can be filled without applying pressure to the raw material surface layer.
[0013]
2nd invention: A convex part is formed in a groove part. Simply flattening makes the air permeability of the groove part slightly higher than other parts, but the unevenness of the air permeability in the width direction is further improved by the convex part.
[0014]
Third invention: If this convex part is leveled to the extent that the other raw material layer surface can be slightly pressed by a downstream cut-off plate, the groove and the low-density region in the vicinity thereof are simultaneously smoothed. It is possible to eliminate the non-uniformity of the air permeability in the width direction.
[0015]
Therefore, the problem of the method of using the V-shaped scraping body and the pair of screw blades as the scraping body can be solved.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0017]
FIG. 1 is a front view of the apparatus of the present invention (viewed along arrow BB in FIG. 3). FIG. 2 is a view taken along arrow EE of FIG. It is a perspective view of what provided the cut-off plate in the downstream.
[0018]
In FIG. 3, the raw material 2 is charged into the pallet 1 by a screen type shunt 4. The screen type shunt 4 is composed of a large number of linear members 4a and guide members 4b for supporting and guiding them. Reference numeral 5 denotes a groove formed by the guide member 4b. The screw type raw material scraping blade 6a is installed between the screen type shunt 4 and the ignition furnace 3, and the rotary shaft is rotated to scrape the raw material on the surface layer of the raw material layer to fill the groove. Make it more convex. The raw material surface projection 7 forms a raw material deposit 9 on the front surface of a cut-off plate 8 provided downstream of the screw-type raw material scraping blade 6. The surface of the raw material layer is smoothed by applying pressure to the portion where the groove 5 was present with the cut-off plate 8. Thereby, a raw material layer having a uniform density in the pallet width direction is obtained.
[0019]
As shown in FIG. 1, the device of the present invention rotates a screw-type scraping blade 6a, which is attached by rotating a blade plate around a rotating shaft 6b in a spiral shape, and rotates the rotating shaft 6b, and changes the rotational speed. It is comprised from the principal part of the rotation change apparatus 15 which can be moved, and the vertical movement apparatus 17 which moves these up and down. The rotating shaft 6 b of the screw type scraper 6 is supported by bearings 12 attached to the lower surfaces of both end portions of the support frame 19. One end of the rotating shaft 6 b protrudes from the bearing 12. A driven sprocket 13 is mounted on the output shaft of a rotation speed changing device 15 including an electric motor mounted on a mounting base 20 provided on the side of the support frame 19. It has been. A chain 16 is wound between the drive sprocket 14 and the driven sprocket 13 so that the screw-type raw material scraping body 6 is rotated by the rotation speed changing device 15. A pair of vertical movement devices 17 are attached to the beam 21, and a screw rod 18 of the vertical movement device holds a support frame 19. The screw-type raw material scraping body 6 is installed along the width direction of the pallet 1. 11 in the raw material layer 2 is a low density region formed in the vicinity of the groove.
[0020]
In order to scrape the raw material toward the groove 5 (in this example, there are four strips), the rotating shaft 6b is attached with spiral blades wound in opposite directions on the right and left sides of the rotating shaft 6b. (The end 6c of the spiral blade on the groove and the end 6d of the spiral blade at the center of the adjacent groove and the groove are shifted by 180 ° about the axis). That is, in this example having four grooves, four blocks of spiral blades wound in opposite directions on the left and right are attached along the rotation shaft 6b. In addition, the terminal ends 6c and 6c of the left and right spiral blades may be connected, or an interval may be provided according to the groove width or the like. The ends 6d and 6d of the left and right spiral blades may also be connected depending on the situation or may be spaced apart.
[0021]
In FIG. 2, an arrow 10 indicates the traveling direction of the pallet 1. The vertical movement device 17 is operated according to the size of the four grooves 5 generated in the raw material surface layer portion, and the biting depth of the raw material scraping blade 6a into the raw material layer 2 is set. When the rotation shaft 6b is rotated in the direction of the broken line arrow 22 with the number of rotations corresponding to the size of the groove, the raw material of the surface layer other than the groove is scraped in the direction of the arrow 23 to fill each groove, and further, the screw type scraping A convex portion 7 that is raised by a predetermined amount after passing through the gathering body 6 is formed. The biting depth h of the raw material scraping blade 6a into the raw material layer 2 is determined by the amount of scraping by the raw material scraping blade 6a (the sum of the embedding amount and the rising amount of the groove 5) q and the axial feed speed of the screw. Since it is a function of the composite speed v of the pallet, the biting depth h can be determined by q and v.
[0022]
FIG. 4 is a cross-sectional view of the raw material layer in the pallet width direction upstream of the screw-type scraping blade. A low density region 11 is formed near the lower portion of the groove 5 generated by the guide member.
[0023]
FIG. 5 is a cross-sectional view of the raw material layer in the pallet width direction at the position of the raw material deposition portion that is blocked by the front surface (upstream side) of the cut-off plate 8. Since this raw material deposition portion 9 is pressed by the cut-off plate 8 and leveled to a flat surface, the low density region 11 in the vicinity of the groove is eliminated.
[0024]
FIG. 6 is a cross-sectional view in the pallet width direction of the raw material layer after passing through the cut-off plate. The raw material layer has a smooth raw material surface and a uniform density in the pallet width direction.
[0025]
【Example】
FIG. 7 shows a method using a scraper having a V-shaped scraper (Japanese Patent Application No. 8-93944); Prior Art 1, a method using a pair of screw blades at the center of the pallet (special Kaihei 8-136152); Prior art 2, the method of claim 1 of the present invention; the methods of inventions 1 and 2; the methods of invention 2 and claim 3; It is the figure which represented the result of having investigated property variation degree and sintering yield (%) in the bar graph. This shows the following.
[0026]
(1) Compared with the prior arts 1 and 2, the present invention 1-3 is smaller in the air permeability variation degree of the pallet width direction. In the present invention, the degree of variation decreases in the order of the present invention 1> the present invention 2> the present invention 3.
(2) Compared with the prior arts 1 and 2, the yields of the present inventions 1 to 3 are further improved. In the present invention, the yield is improved in the order of the present invention 1 <the present invention 2 <the present invention 3.
[0027]
【The invention's effect】
According to the first or second device of the present invention and the method of the present invention , the convex portion that squeezes the raw material around the groove to fill the groove without applying pressure over the entire raw material surface, and further swells the raw material at the groove position Thus, substantially uniform air permeability can be obtained in the pallet width direction.
[0028]
Furthermore, if a cut-off plate is added as in the third device, the material deposition layer is formed on the front surface of the cut-off plate, so that the low-density region near the groove can be eliminated. Uniform air permeability can be secured in the pallet width direction. As a result, it is possible to prevent the occurrence of an unburned portion, a decrease in yield, a decrease in quality, and an increase in the basic unit of coke.
[Brief description of the drawings]
FIG. 1 is a front view of a device of the present invention.
FIG. 2 is a view taken in the direction of arrows EE in FIG.
FIG. 3 is an arrow view of the apparatus of the present invention provided with a cut-off plate.
FIG. 4 is a cross-sectional view of a raw material layer in the width direction upstream of a screw-type scraping blade.
FIG. 5 is a cross-sectional view of the raw material layer in the pallet width direction at the position of the raw material deposition portion that is blocked by the front surface (upstream side) of the cut-off plate.
FIG. 6 is a cross-sectional view in the width direction of the raw material layer after passing through the cut-off plate.
FIG. 7 is a bar graph showing the variation in the width direction of a pallet and the sintering yield of the prior art and the method of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Pallet 2 Sintering raw material 3 Ignition furnace 4 Screen type | mold shout 5 Groove 6 Screw type raw material scraper 7 Raw material surface convex part 8 Cut-off plate 9 Raw material deposition part 11 Low density area | region 12 Bearing 13 Drive sprocket 14 Drive sprocket 15 Speed change device 16 Chain 17 Vertical motion device 18 Screw rod 19 Support frame 20 Mounting base 21 Beam

Claims (3)

A screw-type raw material scraping blade having a rotating shaft provided between the screen type shunt of the sintering machine and the ignition furnace and on the sintered raw material layer and extending in the width direction of the pallet is provided. A raw material permeability uniformizing device in the width direction of the sintering machine, comprising: a vertical movement device for the screw-type raw material scraping blade; and a rotation speed changing device for the screw-type raw material scraping blade. -The raw material scraping blade is wound in the opposite direction right and left with the guide member that supports and guides the screen type shunt on the sintered raw material layer as a boundary to fill the groove, Further, the raw material permeability uniformizing device in the width direction of the sintering machine, characterized in that spiral blades for forming a raised portion of the raw material at the groove position are attached to the rotary shaft so as to face each other. The raw material air permeability uniformizing device in the width direction of the sintering machine according to claim 1, further comprising a cut-off plate downstream of the screw-type raw material scraping blade. By using a screen-type chute made up of a guide member for supporting the linear member and the linear member to supply sintering material to the pallet, screw - with sintering machine to have a formula feed scraper blade baked in the manufacturing method of ore, the screw - a buried groove formed directly below the guide member by scrape a sintering material using equation material scraper blade, further convex portion raised raw material into the groove position method for producing sintered ore according to claim formation allowed sintering to Rukoto.

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