JPH109772A - Sintering raw material charging equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a raw material layer having a particle size distribution segregated in a pallet such that coarse particles are present in a lower layer and fine particles are present in an upper layer by a relatively simple means, and the productivity of a sintered ore is formed. And improve yield. SOLUTION: This is a device for cutting out a raw material accommodated in a surge hopper by a roll feeder and loading the raw material into a pallet of a sintering machine via a feed chute, wherein the chute surface has a lower stage, a middle stage and an upper stage. The raw material is loaded into the pallet using a multi-stage chute that has a structure that reduces the vertical velocity component of the raw material at each bending point on the chute surface. I do.

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 apparatus for a sintering machine, and more particularly to a sintering machine for segregating a coarse raw material into a lower layer and a fine granular material into an upper layer to improve the gas permeability of the raw material layer on the pallet. The present invention relates to a binding material charging device.

[0002]

2. Description of the Related Art A sintering machine ignites the surface of a raw material layer loaded on a pallet with an ignition furnace and advances sintering while suctioning the raw material layer from below with an exhaust fan. When attention is paid to the height, the upper layer is thermally insufficient in heat and the lower layer is excessive in heat. This is because the upper layer is quenched by the cold air sucked from above by burning the coke in the raw material, while the lower layer is gradually heated by the progress of the firing of the upper layer and is sufficiently preheated. This is because the coke is burned afterwards, and is gradually cooled by the residual heat of the upper layer even after the combustion is completed. Therefore, when charging the raw material into the sintering machine pallet, it is necessary to segregate the fine-grained raw material in the upper layer and the coarse-grained raw material in the lower layer.

[0003] A raw material charging device for a sintering machine basically includes a surge hopper, a roll feeder provided below the hopper, and a sintering raw material cut out from the roll feeder on a pallet of the sintering machine. It is generally composed of a feed chute that is tumbled and dropped, and a method of segregating the sintering raw material according to the particle size utilizing the slope classification effect of the raw material is generally used. As the ore feed chute, a flat deflector chute in which a liner of cast steel, stainless steel, ceramics, or the like is stuck on an iron plate is generally used. As means for obtaining a more segregation effect, there are a two-stage charging system and a slit bar type charging device. The two-stage charging system is composed of two systems, i.e., raw material blending and charging. Two types of raw materials having different coke blending ratios and raw material particle sizes are prepared, and are loaded on a sintering machine pallet in two stages. It is a method to enter. The slit bar type charging device is a method in which a feed chute portion is constituted by a horizontal slit bar or a vertical slit bar, and the raw material is classified into coarse particles and fine particles and then charged.

[0004] However, in the case of the raw material charging apparatus in which the raw material is simply rolled and dropped on the feed chute, the mixed raw material adheres to the surface of the deflector chute, and the supply state becomes unstable. Therefore, the variation in air permeability in the raw material layer on the pallet becomes large, and the temperature in the sintering raw material layer on the pallet is disturbed, and the operation becomes unstable. In addition, in the case of a chute with a ceramic liner, it is possible to prevent the adhering of the blended raw material, but the rolling of the raw material is extremely small, so that the pseudo-particles break down or classify, so that the air permeability in the raw material layer on the pallet is reduced. And the productivity is remarkably reduced.

Further, the two-stage charging method has a problem that equipment costs are high because two systems each of a raw material blending / granulating system and a raw material charging device are required. Further, the slit bar type charging apparatus has a drawback that the raw material adheres to the slit bar and causes clogging during continuous use for a long time, so that an effective function cannot be exhibited.

To solve the above-mentioned problems of the prior art, for example, Japanese Patent Application Laid-Open No. Hei 4-21724 discloses that the radius of curvature is fixed or the radius of curvature is fixed so that the slope of the chute on which the sintering material slides is concave. A raw material charging apparatus (hereinafter referred to as an "a apparatus") using a spirally-curved feed chute whose radius increases in proportion to the power of the chute in the vertical direction from 0 to 1 power (not including 0 and 1 power). ) Has been proposed. This device increases the horizontal component ratio of the moving speed without lowering the moving speed of the raw material at the lower end of the chute, thereby increasing the moving speed of the raw material at the lower end of the chute in the pallet. This is to improve the particle size segregation and carbon segregation in the height direction of the charged raw material.

In Japanese Patent Application Laid-Open No. Hei 7-110194, a drum chute is provided at a position where a raw material falls from a roll feeder, and a screen-shaped screen is provided following this drum chute and inclined in the direction opposite to the direction of movement of the pallet. A raw material charging device (hereinafter referred to as a “b device”) in which a raw material cut from a roll feeder is dropped on a drum chute and then fed to a pallet via a screen-shaped chute. ) Has been proposed. In this device, the raw material cut out from a roll feeder is dropped on a drum chute, and is gently slid down onto a screen-shaped chute by rotation of the drum chute, thereby giving an impact to a raw material layer in a pallet. It is possible to prevent the avalanche phenomenon on the slope of the raw material formed in the pallet.

[0008]

However, the above-mentioned prior art has the following problems. That is, in the case of the device A, the concave chute can suppress the raw material charging vertical speed and increase the horizontal speed as compared with the flat type chute, but the inclination angle of the concave chute is almost the same as the conventional one, so the vertical speed is suppressed. The effect is not sufficiently obtained, so the classification effect on the chute is small especially in the case of sintering raw material with fine material particle size, and the effect of improving the particle size segregation in the layer height direction of the raw material charged in the pallet is sufficient. It cannot be said. In addition, in the case of the device (b), it is necessary to secure a space for installing a drum chute.
There is a drawback that equipment costs are high.

SUMMARY OF THE INVENTION The present invention has been made to solve the problems of the above-mentioned apparatus and apparatus, and it is possible to improve the grain size segregation in the height direction in the pallet of the sintering machine by relatively simple means, to improve the quality of sinter ore. An object of the present invention is to propose a sintering raw material charging apparatus capable of sufficiently improving the productivity.

[0010]

According to the present invention, a feed chute for cutting out a raw material accommodated in a surge hopper by a roll feeder provided at a lower portion of the hopper and supplying the raw material to a continuously moving pallet is provided. In the sintering raw material charging apparatus provided, the ore feed chute has a multi-stage structure, and the chute inclination angle in each stage can be changed independently, and the gist is that the ore feed chute is vertically moved. The multi-stage chute is divided into three successive stages, a lower stage, a middle stage and an upper stage, and the angle between each stage and the horizontal plane of the pallet is independently variable. Further, the multi-stage chute is constituted by a flat plate, a horizontal slit bar or a vertical slit bar.

In the present invention, the ore feed chute is vertically divided into three stages of a lower stage, a middle stage and an upper stage, and the angle between each stage and the pallet horizontal plane, that is, the chute inclination angle is independently variable. This is for the following reason. In order to increase the classification effect of the feed chute, it is preferable to reduce the feed rate of the raw material, and to measure the classification effect of the raw material on the chute, it is more effective to increase the horizontal velocity component at the lower end of the chute. In order to further reduce the packing density of the raw material in the pallet, it is better to reduce the raw material supply rate. In order to satisfy such a condition, it is necessary to make the falling speed of the raw material different at a plurality of positions in the height direction of the feed chute. This is because it has been found that it is effective to make the inclination angles of the surfaces different so that the inflection points exist on the chute surfaces, and that the inclination angles of the chute surfaces can be independently changed.

The ore feeding chute is vertically divided into three stages of a lower stage, a middle stage, and an upper stage, and the angle between each stage and the pallet horizontal plane, that is, the chute inclination angle is larger in the upper stage, smaller in the middle stage than in the upper stage, The lower part is set smaller than the middle part. This is because, in the upper part of the chute, the inclination angle is increased to increase the scalar amount of the raw material speed (combination of the vertical and horizontal directions), and in the lower part of the chute, the inclination angle is reduced to reduce the velocity in the vertical direction. At the same time, the residence time of the chute is extended to perform slope classification.

By setting the lower, middle, and upper chute surface angles of the mining chute as described above, the inclination angle is large (an angle close to vertical) in the upper chute, so that the raw material speed increases, and From the lower part of the chute, the raw material velocity decreases, and in the lower part of the chute, the horizontal component of the raw material velocity increases. Therefore, as a result, the absolute value of the raw material velocity increases, and the ratio of the horizontal velocity component / vertical velocity component also increases.

That is, in the case of the multistage ore feeding chute of the present invention, there are bending points in the connecting portion between the upper and middle chutes and the connecting portion between the middle and lower chutes in the height direction of the chute surface. At the inflection point, the vertical component of the feed rate decreases. In other words, the raw material that has slid down the upper chute collides with the middle chute at the connection with the middle chute, so that the vertical component of the raw material speed decreases. Since the vertical component is further reduced by colliding with the chute, the classification of the raw material on the chute is enhanced.

Further, since the inclination angle of each chute surface can be changed independently, it is possible to change the inclination angle of each chute surface according to the sintering raw material conditions. In this case, the classification can be strengthened by setting the inclination angle of each chute surface so that the horizontal speed of the raw material is higher and the vertical speed is lower.

[0016]

1 to 3 exemplify a sintering raw material charging apparatus according to the present invention. FIG. 1 is a schematic view showing a flat chute charging type sintering raw material charging apparatus. (A) is a side view, (b) is a front view of a feed chute, FIG. 2 is a schematic view showing a sintering raw material charging apparatus of a horizontal slit bar chute charging system, (a) is a side view, (b) ) Is a front view of an ore feeding chute, FIG. 3 is a schematic view showing a sintering raw material charging apparatus of a vertical slit bar chute charging method, (a) is a side view, and (b) is a front view of an ore feeding chute. 1 is a surge hopper, 2 is a roll feeder, 3 is a multi-stage flat plate chute, 4 is a multi-stage horizontal slit bar chute, 5 is a multi-stage vertical slit bar chute, 6 is a raw material, and 7 is a sintering machine pallet.

That is, the sintering raw material charging apparatus of the flat chute charging type shown in FIG. 1 includes a roll feeder 2 provided at the lower end of a surge hopper 1 for cutting out a raw material 6 contained in the hopper. Between the continuously moving sintering machine pallet 7 and the sintering machine pallet 7, the upper end of which is located directly below the roll feeder 2, and the lower end thereof is located above the sintering machine pallet 7, and the inclined multistage flat plate chute 3 is provided. The multi-stage flat plate chute 3 has an upper chute 3-1, a middle chute 3-2, and a lower chute 3-3, and has an upper chute 3-1, a middle chute 3-2, and a middle chute 3-3.
The lower chute 3 and the lower chute 3-3 are connected to each other by a concave-convex fitting method, and one connecting shaft 3-4b, 3-4c is gently penetrated through the concave-convex fitting portion of each connecting portion, and the shaft is used as a fulcrum. The middle chute 3-2 and the lower chute 3-3 are rotatably connected to each other.
A chute having a divided structure including a middle chute 3-2 and a lower chute 3-3 is pivotally mounted on a pair of left and right side plates 3-5. The mounting structure is such that the top of the upper chute 3-1 is attached to the side plate 3--3. 5 is rotatably supported by one shaft 3-4a, and the connecting shafts 3-4b, 3-4
The concave / convex fitting portions of the connecting portions are set by setting the respective inclination angles θ ₁ , θ ₂ , θ ₃ of the upper chute 3-1, the middle chute 3-2 and the lower chute 3-3 so that the portion c becomes a bending point. Shafts 3-4b, 3-4c loosely penetrating through
Through the side plate 3-5.

Upper chute 3-1 and middle chute 3-2
And the inclination angles θ ₁ and θ of the lower chute 3-3, respectively.
_2, theta ₃ angle as an adjustment method of, for example, side plates 3-5 to the coupling shaft 3-4b, a shaft support hole 3 for angular adjustment a plurality by the hole through the support allowed to hole the 3-4c
-6, and any one of these holes is selected to allow the connecting shafts 3-4b and 3-4c to penetrate and support the upper and lower chutes 3-1, 3-2 and 3-3. A method of independently adjusting the angles of the inclination angles θ ₁ , θ ₂ , and θ ₃ can be used. That is, when changing the inclination angle theta ₁ of the upper chute 3-1, change the support position of the connecting shaft 3-4b, when changing the inclination angle theta ₂ of the middle chute 3-2, connecting shaft Change the support position of 3-4b or 3-4c,
When changing the inclination angle theta ₃ of the lower chute 3-3 can easily change the angle of each chute surface by changing the supporting position of the connecting shaft 3-4C.

Next, in the sintering raw material charging apparatus of the horizontal slit bar chute charging system shown in FIG. 2, a multi-stage horizontal slit bar is installed between the surge hopper 1 and the sintering machine pallet 7. The chute 4 has a pair of left and right side plates 4-1a, 4-2a and 4 respectively.
-3a comprises an upper slit bar chute 4-1 comprising a plurality of slit bars, a middle slit bar chute 4-2 and a lower slit bar chute 4-3, the upper slit bar chute 4-1 and the middle slit bar. The chute 4-2, the middle slit bar chute 4-2, and the lower slit bar chute 4-3 are rotatably connected to joints of the side plates by connecting pins 4-4a and 4-4b, respectively. A chute having a split structure including a chute 4-1, a middle slit bar chute 4-2 and a lower slit bar chute 4-3 is pivotally mounted on a pair of left and right support plates 4-5. The top of the slit bar chute 4-1 is rotatably supported on a support plate 4-5 by a support shaft 4-6a. 4b portions upper slit-shoot so that the bending points 4-1, respectively of the inclination angle theta ₁ of the middle slit-shoot 4-2 and lower slit-shoot _4-3, theta _2, wherein each connecting with a theta ₃ The connecting pins 4-4a and 4-4b are supported by the support plate 4-5.

The method of adjusting the inclination angles θ ₁ , θ ₂ , and θ ₃ of the upper slit bar chute 4-1, the middle slit bar chute 4-2, and the lower slit bar chute 4-3 is as described above. The support plate 4-5 is provided with a shaft support hole 4-6 for adjusting the angle for penetrating and supporting the connection pins 4-4a and 4-4b.
-1, each inclination angle θ _{1 of} the middle slit bar chute 4-2 and the lower slit bar chute 4-3,
A method of independently adjusting the angles θ ₂ and θ ₃ can be used.

The sintering raw material charging apparatus of the vertical slit bar chute charging system shown in FIG. 3 has a multi-stage vertical slit bar chute provided between the surge hopper 1 and the sintering machine pallet 7. In the structure, the upper and lower ends of a plurality of vertical slit bars are respectively attached to a pair of left and right side plates 5-1a, 5-2a, 5-3a by a shaft 5-.
4a, 5-4b, and 5-4c, and side plates of an upper slit bar chute 5-1 and a middle slit bar chute 5-2, a middle slit bar chute 5-2, and a lower slit bar chute 5-3. Is composed of an upper slit bar chute 5-1, a middle slit bar chute 5-2 and a lower slit bar chute 5-3, which are rotatably connected by shafts 5-4a and 5-4b. A chute having a divided structure composed of a bar chute 5-1, a middle slit bar chute 5-2 and a lower slit bar chute 5-3 is pivotally mounted on a pair of left and right support plates 5-5. Shaft 5 of upper and lower ends of upper slit bar chute 5-1
4a and the shaft 5-4b at the lower end of the middle slit bar chute 5-2 are connected to the upper slit bar chute 5-2.
The upper slit bar chute 5-1, the middle slit bar chute 5-2 and the upper slit bar chute 5-1 such that the shaft 5-4a at the lower end of the shaft slit 5 and the shaft 5-4b at the lower end of the middle slit bar chute 5-2 are bent. The lower slit bar chute 5-3 penetrates and supports the support plate 5-5 at the respective inclination angles θ ₁ , θ ₂ , θ ₃ .

The method for adjusting the inclination angles θ ₁ , θ ₂ , θ ₃ of the upper slit bar chute 5-1, the middle slit bar chute 5-2 and the lower slit bar chute 5-3 is shown in FIG. As with the multi-stage horizontal slit bar chute 4, the shafts 5-4b and 5-5
-4c through which the shaft support hole for adjusting the angle which supports through
6, a method of independently adjusting the inclination angles θ ₁ , θ ₂ , and θ ₃ of the upper slit bar chute 5-1, the middle slit bar chute 5-2, and the lower slit bar chute 5-3 is used. be able to.

In addition, the upper stage, the middle stage,
As described above, the inclination angle of each lower chute is set so that the segregation state of the raw material is always optimal according to the sintering raw material conditions.

[0024]

EXAMPLE A sintering raw material was charged into a pallet using the sintering raw material charging apparatus shown in FIGS. Table 1 shows the raw material conditions in this example, and Table 2 shows the equipment conditions of each charging device.
Table 3 shows the results. In Table 3,
For comparison, the results of a case where the same raw material is loaded on a pallet using the conventional apparatus A and the apparatus B described above are also shown.

The segregation index in this example is defined by the following equation (1), and the larger the value, the more the particle size segregates. The permeability (JPU) of the raw material packed layer is defined by the following equation (2), and the higher the value, the lower the packing density.

[0026]

[0027]

As is clear from the results shown in Table 3, when the apparatus of the present invention shown in FIGS. 1 to 3 is used, the segregation index and the raw material permeability are all improved as compared with the prior art, and the yield and the yield are improved. It was confirmed that the production rate was improved.

[0029]

[Table 1]

[0030]

[Table 2]

[0031]

[Table 3]

[0032]

As described above, according to the apparatus of the present invention, the chute surfaces on which the sintering raw material cut out from the surge hopper through the roll feeder slides are formed in a multistage type having different inclination angles, and each chute surface is formed. Of the sintering raw material at the lower end of the chute without increasing the horizontal component of the moving speed. The raw material segregation index and raw material permeability in the layer height direction of the inserted sintering raw material can be improved, and the heat history is made uniform, thereby greatly improving the productivity and yield of sinter. be able to. Furthermore, the device according to the invention has the advantage that existing chutes can be easily retrofitted at low cost.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a sintering raw material charging apparatus of a flat chute charging type according to the present invention, wherein (a) is a side view, and (b) is a front view of an ore feeding chute.

FIG. 2 is a schematic view showing a sintering raw material charging apparatus of a horizontal slit bar chute charging system according to the present invention, wherein (a) is a side view and (b) is a front view of a mining chute.

FIG. 3 is a schematic view showing a sintering raw material charging apparatus of a vertical slit bar chute charging system according to the present invention, wherein (a) is a side view and (b) is a front view of a mining chute.

[Explanation of symbols]

 Reference Signs List 1 surge hopper 2 roll feeder 3 multi-stage flat plate chute 4 multi-stage horizontal slit bar chute 5 multi-stage vertical slit bar chute 6 raw material 7 sintering machine pallet

Claims (2)

[Claims] Claims 1. A raw material stored in a surge hopper is
Cut out with a roll feeder provided at the bottom of the hopper,
In a sintering raw material charging apparatus provided with an ore feeding chute for feeding into a continuously moving pallet, the ore feeding chute is divided into three stages of a lower stage, a middle stage and an upper stage which are vertically continuous, and each stage is divided into three stages. A sintering raw material charging apparatus characterized in that a multi-stage chute in which the angle between the pallet and the horizontal plane is independently variable is formed. 2. The sintering raw material charging apparatus according to claim 1, wherein the multi-stage chute is constituted by a flat plate, a horizontal slit bar, or a vertical slit bar.