JPH0429953B2 - - Google Patents

Description

[Detailed description of the invention]

Technical Field of the Invention The present invention relates to a method and device for charging raw materials in a DL type sintering machine, and the present invention relates to a method and device for charging raw materials in a DL type sintering machine, which can charge raw materials by effectively causing grain size segregation in the height direction of a sintering machine pallet. METHODS AND APPARATUS. Conventional technology and its problems During the sintered ore manufacturing process in a DL type sintering machine, when charging raw materials for sintering from the ore feeder to the top of the pallet, the upper layer contains more fuel (coke) than the lower layer. It is also well known that it is more effective to improve the quality and productivity of sintered ore if the raw material grain size is coarser in the lower layer than in the upper layer. In the current DL type sintering machine, as shown in Fig. 11, the raw material is dropped from the ore hopper 1 via the drum feeder 2 or belt feeder (not shown) and is fed onto the sintering machine pallet 4 via the chute 3. The common method is to supply ore to Even with such a well-known charging method, fine coke tends to segregate in the upper layer of the charging raw material layer 5, and in this sense, the coke content in the upper layer tends to be higher than that in the lower layer. , it is not enough to bring about a sufficient improvement effect on the quality and productivity of sintered ore. Therefore, conventionally, several raw material charging devices, for example, two raw material charging devices as shown in FIG. A two-stage charging method has been proposed in which raw materials with a high coke powder content are fed so that a high coke powder blend material layer is formed in the upper part of the charging material layer and a low coke powder blend raw material layer is formed in the lower part of the charging material layer. There is. However, this method requires high equipment costs, and when applied to an existing DL type sintering machine, the ignition furnace must be relocated or the strand length must be extended, which requires a large amount of modification work. It has the disadvantage of being costly. Further, in Japanese Utility Model Application No. 51-58103, as shown in Fig. 12, the lower half of the chute is connected to the mesh plate 3-1.
In addition, a raw material supply device has been proposed in which the upper half is constituted by a blind plate 3-2 and the chute is vibrated from side to side by a vibration device 6. In the case of this device, the raw material supplied from the upper blind plate 3-2 is vibrated and sieved by the lower mesh plate 3-1, and is sloped to the lower end of the chute, onto the coarse raw material on the sieve of the mesh plate. The fine-grain raw material is dropped and deposited under the sieve to obtain two layers of charged raw material, the upper layer being the fine-grain raw material and the lower layer consisting of the coarse-grain raw material.
However, although this method is effective in the short term, when used continuously for a long time, the sintering raw material is wet with a moisture content of 4% or more, so it adheres to the mesh and causes clogging, making it less effective. There is a drawback that it cannot perform its functions. This becomes a particularly serious problem when the opening interval is 10 mm or less. In addition to these, a method using a slit-like chute has been proposed (Utility Model Application No. 49-39805, Utility Model Application No. 39805,
51-55804, etc.), but all of these are based on the dispersion of raw materials using slits, and have little classification effect on particle size segregation, and are not sufficient to improve sintered ore quality and productivity. I have not yet achieved this. Purpose of the Invention The present invention has been made in view of the above-mentioned drawbacks of the conventional art, and in particular, to obtain an optimal raw material segregation charging state that sufficiently improves the strength, product yield, and productivity of sintered ore. The purpose of this project is to propose a new charging method that allows for a large amount of fuel, and a charging device that is inexpensive and has the ability to significantly control the degree of segregation. Structure of the Invention The raw material charging method for the DL type sintering machine according to the present invention is as follows:
A reversing mechanism is installed between the roll feeder and the sintering machine pallet in the raw material feeding section, and the opening interval is 10 mm.
The ore feed chute having the following slits or meshes is installed at an inclination angle of 45 degrees or more, and the raw material is dropped onto the upper surface of the chute to feed the ore onto the sintering machine pallet. Further, in the raw material charging device according to the present invention, the ore feeding chute located between the roll feeder and the pallet is configured with slits or meshes with an opening interval of 10 mm or less, and the slits or meshes are reversed via a link mechanism. The mechanism is characterized in that the ore feeding chute is installed at an angle of inclination of 45 degrees or more. This invention will be explained in detail below. Here, explanation will be given by taking an ore feed chute with a slit structure as an example. FIGS. 1 and 2 schematically show the raw material feeding section according to the present invention, in which 13 has a slit 14 with an opening interval of 10 mm or less (preferably 4 to 9 mm),
The ore feeding chute is also equipped with a reversing mechanism, and is installed inclined at an angle of 45 degrees or more (preferably 50 to 60 degrees) with respect to the horizontal plane. Here, the reason why the interval between the slits 14 of the ore feed chute 13 is set to 10 mm or less (preferably 4 to 9 mm) is because the majority of sintering raw materials usually have a grain size of 10 mm or less, so slits of 10 mm or more are not suitable. This is because the classification of coarse particles and fine particles is insufficient and its effectiveness is reduced. In addition, the reason why the inclination angle of the grade chute 13 is set to 45 degrees or more (preferably 50 to 60 degrees) is because if it is less than 45 degrees, the flow of raw materials will be poor and a stagnation phenomenon will occur, resulting in large raw material charging unevenness. It is. In the case of an ore feed chute having a slit structure, as time passes, the slit portion becomes clogged with raw materials 15 as shown in FIG. 3A, and the classification effect of the slit 14 is reduced. Therefore, in the present invention, as a method of preventing the above-mentioned clogging, a method is adopted in which the slit 14 of the ore feeding chute is reversed. As will be described later, this reversing mechanism may employ a method in which the slit bar 13-1 for forming the slit is reversed by a link mechanism. That is, if the slit part is clogged with coarse ore 15-1 and adhering powder 15-2 as shown in Fig. 3A, the slit part is turned upside down as shown in Fig. 3B. Then, the clogged raw material is swept away by the raw material flow on the same chute, and as shown in Figure C, it detaches from the chute and falls, forming a new slit and restoring the classification action. I can do it. Next, to specifically explain the apparatus for carrying out the method of this invention, in the case of the ore feeding chute 13 shown in FIGS. 1 and 2, as shown in an enlarged view in FIG. Two movable rods 13
-2, a slit bar 13-1 horizontally installed between the movable rods at a predetermined opening interval, a support shaft 13-3 horizontally installed between each slit bar, and each support shaft 13-3 and the slit bar 13-1. Link 13 connecting between
-4, and by moving the movable rod 13-2 back and forth, the entire slit bar 13-1 is reversed using the support shaft 13-3 as a fulcrum.
Reference numeral 13-5 denotes an ore feed chute fixing frame, which is attached so that its inclination angle can be changed. FIG. 5 is an explanatory diagram showing the reversing mechanism of the ore feeding chute, which is normally in the state shown in FIG.
3-1 is placed on the fixed frame 13-5. In this state, when the movable rod 13-2 is pushed forward (downward), the link 13
-4, each slit bar 13-1 is rotated around the support shaft 13-3 as a fulcrum while tracing a semi-circular trajectory, and is stopped on the fixed frame 13-5. Therefore, by moving the movable rod 13-2 back and forth, the entire slit bar 13-1 can be reversed by a series of link mechanisms. Note that the direction of the slits may be parallel to the raw material flow direction as shown in FIG. In other words, in this case, the ore feeding chute shown in Figure 2 may be installed with its orientation changed by 90 degrees. Furthermore, the opening intervals of the slits are not equal throughout, but may be increased toward the lower part of the chute, as shown in FIGS. 7A and 7B. 14- in the figure
1, 24-1 is a narrow slit, 14-2, 24-
2 is a wide slit. Effects of the Invention As described above, the device of the present invention has an ore feed portion for sintering raw material that is composed of an ore feed chute having slits with an opening interval of 10 mm or less and a mechanism for reversing the slits. Explaining based on FIGS. 1 and 2, the raw material cut out from the drum feeder 2 falls onto the ore feed chute 13 in which slits 14 with an opening interval of 10 mm or less are formed, and flows downward along the slit surface. Roll. At this time, coarse raw materials with a particle size of 10 mm or more roll to point A at the lower end of the ore feed chute.
The pallet 4 is charged with an inclined surface formed in the lower layer. Then, while rolling on the raw material accumulation slope B, the raw material is further classified and charged in order from the bottom to the top, starting with coarse grains. On the other hand, fine grain raw materials of 10 mm or less are fed to the ore feed chute 13.
The powder passes through the slit 14 and is charged onto the coarse grain accumulation layer in the pallet 4 without rolling to the lower end point A, but since finer particles tend to pass through the slit at the upper side of the chute, they are moved sequentially. In the pallet 4, the raw materials are deposited in the order of the largest grain size among the fine grains, and the one with the smallest diameter is charged to the top layer. The surface of the packed bed of the raw material charged into the moving pallet 4 is leveled by the raw material surface leveling tool 16. After that, if the ore feeding chute 13 becomes clogged, the movable rods 13-2 on the left and right sides of the chute
By operating the slit 14 and reversing the slit 14, clogging can be eliminated and the classification action can be restored based on the principle shown in FIGS. 3B and 3C.
Figure 8 shows experimental confirmation of the clogging situation in a chute with an opening interval of 5 mm.Clogging occurred as time passed from the start of ore feeding, but the slit was reversed after 2 hours had elapsed. I was able to get it back to normal again. Therefore, by periodically repeating the reversal of the slit, a state without clogging can be always created. Examples Sintered raw materials having the particle size distribution shown in Table 1 were charged into pallets under the conditions shown in Table 2 to produce sintered ore. Table 3 shows the results. For comparison, Table 3 also shows the results obtained using the conventional ore feed chute shown in FIGS. 11 and 12 under the conditions shown in Table 2. The grain size segregation and coke grain size segregation in the pallet height direction in this example are shown in FIGS. 9 and 10, respectively, in comparison with the conventional method. As is clear from the results shown in Figures 9 and 10, this invention results in greater segregation of particle size and coke concentration in the pallet height direction than in the past, and as a result, as is clear from Table 3, sinterability is greatly improved. It has been vastly improved.

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[Table] Effects of the Invention As explained above, according to the method and apparatus of the present invention, coarse grain raw materials and fine grain raw materials are effectively classified, and the coarse grain raw materials are deposited in the lower layer and the fine grain raw materials in the upper layer. As a result, grain size segregation in the pallet height direction is further strengthened, and a sufficient improvement effect can be obtained in sintered ore quality and productivity. Furthermore, since the ore feed chute according to the present invention has a slit reversal mechanism, it is possible to prevent clogging even with wet raw materials, and to prevent particle size segregation in the pallet height direction without reducing the classification effect. can be maintained, and charging with particle size segregation in the pallet height direction can be performed even during long-term continuous operation. Furthermore, even if the segregation degree differs depending on the raw material particle size distribution structure, the classification effect of the slit can be changed by changing the inclination angle of the chute, so adjustments are made according to the raw material particle size, classification effect, and segregation degree. It also has the effect of being able to.
In addition, the charging device itself not only has a simple structure, but also has the advantage of being easily applicable to existing DL type sintering machines, and has great effects in terms of equipment costs and operating costs.

[Brief explanation of drawings]

Fig. 1 is a side view schematically showing the raw material feeding section according to the present invention, Fig. 2 is a front view of the same as above, Fig. 3 is an explanatory diagram showing the principle of preventing clogging of raw materials, and Fig. 4 is a diagram showing the principle of preventing clogging of the raw material. FIG. 5 is an explanatory view showing a reversing mechanism in the chute, and FIG. 6 is a schematic diagram showing the ore feed chute in which the direction of the slit is parallel to the raw material flow direction. , Figure 7 is a schematic diagram showing an ore feeding chute in which the opening interval is widened as it goes downwards, Figure 8 is a chart showing the clogging situation of a chute with an opening interval of 5 mm width, and Figure 9 is a diagram showing the clogging status of a chute with an opening interval of 5 mm A chart showing the particle size distribution in the pallet height direction in an embodiment of the present invention, FIG. 10 is a chart showing the coke concentration distribution in the pallet height direction, and FIGS. 11 and 12 are schematic diagrams of the conventional raw material feeding section. FIG. 1...Ore feeding hopper, 2...Drum feeder,
4... Pallet, 13... Ore feed chute, 13-
1... Slit bar, 13-2... Movable bar, 13
-3...Spindle, 13-4...Link, 13-5...
...Fixed frame, 14...Slit, 14-1, 24-
1... Narrow slit, 14-2, 24-2... Wide slit.

Claims (1)

[Claims] 1. In the raw material feeding section of the DL type sintering machine, an ore feeding chute equipped with a reversing mechanism and having slits or meshes with an opening interval of 10 mm or less is provided between the roll feeder and the sintering machine pallet. A method for charging raw materials into a DL type sintering machine, characterized in that the chute is installed at an inclination angle of 45 degrees or more, and the raw materials are dropped onto the upper surface of the chute to be fed onto the sintering machine pallet. 2 Opening interval of raw material feed chute of DL type sintering machine
A DL type sintering machine characterized by comprising slits or meshes of 10 mm or less, having a mechanism for reversing the slits or meshes via a link mechanism, and having the ore feed chute installed at an inclination angle of 45 degrees or more. raw material charging equipment.