JP2011163756A - Device for charging material into sintering machine - Google Patents

Abstract

[PROBLEMS] To improve the controllability of particle size distribution and component distribution in a raw material layer of a sintering machine pallet, and to charge the raw material to the sintering machine in order to obtain high quality, high yield and high productivity. Providing the device.
A raw material supply mechanism for supplying a raw material for sintering to a pallet, and a movement direction of the pallet, the upper end of which is located in the vicinity of the raw material supply mechanism and the lower end of the raw material supply mechanism is located above the pallet. Consists of chutes that are inclined in the opposite direction, and the chutes are arranged in parallel in the width direction of the pallet at predetermined intervals from the upper end to the lower end of the pallet. The chute has a concavely curved shape from its upper end to its lower end, and between adjacent rods in a range corresponding to the upper end side 1/3 of the horizontal length of the chute. The average value of the change rate of the connecting gradient is 1.5 to 10 times the average value of the change rate of the gradient in the range corresponding to the lower end side 2/3.
[Selection] Figure 3

Description

  The present invention relates to a raw material charging apparatus for charging a raw material for sintering into a sintering machine for continuously producing sintered ore.

The sintered ore used as a blast furnace raw material is generally produced by the following method.
The granulated raw material for sintering is continuously supplied from the hopper onto the pallet of the sintering machine with a predetermined layer thickness, for example, a layer thickness of about 500 to 700 mm. Next, the carbon material in the surface layer is ignited in an ignition furnace, and the carbon material is burned while forcibly sucking air downward. Sintered ore raw material is sintered and agglomerated by the combustion heat generated during combustion. The “sintered cake” thus fired is crushed and cooled. After cooling, the particles are sized and 3-5 mm or more particles that satisfy the quality standards are charged into the blast furnace as “sintered ore products”. A quality rejected product and a powder sintered ore of 3 to 5 mm or less generated in the crushing / sizing process are used again as a raw material for sintering as a return ore.

  The quality of the sintered ore used as the raw material for the blast furnace produced in this way has a great influence on the stability of the unloading state during the operation of the blast furnace, the ventilation / liquid permeability, the reduction efficiency, the high temperature property, and the like. Accordingly, high quality is required for the sintered ore, strict quality control is performed, and improvement of the product yield of the sintered ore is required to reduce the manufacturing cost.

  One of the most important conditions for maintaining high quality, maintaining high product yield, reducing manufacturing costs, and improving productivity for the above-mentioned sintered ore is the firing to be charged into the sintering machine pallet. It is to appropriately adjust both the in-layer particle size distribution and the component distribution of the binding raw material. By appropriately adjusting both the particle size distribution and the component distribution in the layer, the air permeability in the raw material layer having a height of about 500 to 700 mm is secured to improve the combustion of the carbonaceous material, and by the heat of combustion. It becomes possible to appropriately control the melting and sintering reaction of the sinter raw material. Therefore, conventionally, many raw material charging techniques for adjusting the in-layer particle size distribution and component distribution of the sintering raw material charged in the pallet have been proposed.

  For example, Patent Document 1 proposes a raw material charging apparatus as shown in FIG. The sintering raw material 3 is sent out from the hopper 1 by the roll feeder 2 and falls. The dropped sintering raw material 3 slides down the flat chute 4 that is inclined downwardly facing the roll feeder 2. A plurality of ropes or rods 5 are arranged in a width direction of the sintering machine pallet 6 at a predetermined pitch on a substantially extended line below the flat chute 4 so that a plurality of slit-like gaps 7 are formed. The sintering raw material sliding down falls onto the sintering machine pallet 6 from the plurality of slit-like gaps 7 to form a raw material layer 8 having a predetermined thickness. The downward inclination direction of the particle size segregation charging mechanism 9 which is a structure in which the slits 7 are formed with a plurality of the predetermined pitches is the moving direction of the sintering machine pallet 6 (the direction of the arrow x in FIG. 1). ). The slit-like gap 7 is narrow on the upper plate-like chute 4 side and wide on the lower sintering machine pallet 6 side. Thus, the particle size distribution of the raw material for sintering inside the raw material layer 8 charged in the pallet 6 can be adjusted so that coarse particles are deposited in the lower layer portion and fine particles are deposited in the upper layer portion (hereinafter referred to as the preceding). Technology 1).

  As another example, Patent Document 2 proposes a raw material charging apparatus as shown in FIG. The sintering raw material 3 is sent out from the hopper 1 by the roll feeder 2 and falls. The dropped sintering raw material is received by the drum feeder 10 that is provided below the roll feeder 2 and rotates in opposition to the falling direction of the sintering raw material. A plurality of rods or ropes 5 are arranged at a predetermined pitch in the width direction of the sintering machine pallet 6 on a curved surface that is inclined downward from the front surface of the drum feeder 10 and gently curved downward. A gap 7 is formed. The raw material for sintering whose dropping speed is reduced by the drum feeder 10 falls onto the sintering machine pallet 6 from the plurality of slit-like gaps 7 to form a raw material layer 8 having a predetermined thickness. The downward inclination direction of the particle size segregation charging mechanism 9 which is a structure having a plurality of the above-mentioned predetermined pitches and formed with slit-like gaps 7 is the moving direction of the sintering machine pallet 6 (the direction of the arrow x in FIG. 2). ). The slit-shaped gap 7 is narrow on the upper drum feeder 10 side and wide on the lower sintering machine pallet 6 side. Thus, the particle size distribution of the raw material for sintering inside the raw material layer 8 charged in the pallet 6 can be adjusted so that coarse particles are deposited in the lower layer portion and fine particles are deposited in the upper layer portion (hereinafter referred to as the preceding). Technology 2).

  As described above, according to the prior arts 1 and 2, as for the particle size of the raw material for sintering inside the raw material layer 8 charged in the sintering machine pallet 6, the lower layer is coarse and the upper layer is fine. Can be formed into a particle size distribution in which they are deposited. However, regarding the adjustment of the distribution of the components in the raw material layer 8, the raw material charging technique to the sintering machine pallet 6 according to the prior art such as the prior art 1 and the prior art 2 described above, the composition of the raw material for sintering It is not possible to adjust the distribution in the layer of components, for example, carbonaceous materials such as powdered coke, which is a solid fuel, and CaO, which is a slag component.

  Further, in the raw material supply device in which the chute described in Patent Document 2 is continuously curved, the avalanche phenomenon can be prevented, but it is difficult to balance the curvature of the particle velocity and the rod arrangement curve, The problem of insufficient classification and the problem that all particles fall from between the rods before reaching the end of the chute occur.

Japanese Utility Model Publication No. 3-43599 JP-A-8-311568

  The purpose of this invention is to improve the controllability of the component distribution in addition to the particle size distribution in the raw material layer of the sintering machine pallet, and to achieve high quality, high yield and high productivity. It is to provide a raw material charging apparatus to a machine.

  In order to achieve the above object, the present invention provides a raw material supply mechanism for supplying a raw material for sintering to a pallet, an upper end thereof being positioned in the vicinity of the raw material supply mechanism, and a lower end thereof being above the pallet. Provided is a raw material charging device for a sintering machine, which is located and is composed of a chute that is inclined in a direction opposite to the moving direction of the pallet.

  The chute is composed of a plurality of rods arranged in parallel at a predetermined interval from the upper end to the lower end in the width direction of the pallet, and curved in a concave shape from the upper end toward the lower end. Has a shape.

  The average change rate of the gradient connecting the adjacent rods in the range corresponding to the upper end side 1/3 of the horizontal length of the chute is the gradient change rate in the range corresponding to the lower end side 2/3. The average value is 1.5 to 10 times.

FIG. 1A is a schematic vertical sectional view showing an example of a raw material charging apparatus for a conventional sintering machine.
FIG.1 (b) is a figure which shows typically the slit-shaped clearance gap in the segregation charging mechanism of the raw material charging device of Fig.1 (a).
FIG. 2 is a schematic vertical sectional view showing another example of a raw material charging apparatus for a conventional sintering machine.
FIG. 3 is a vertical cross-sectional view showing the raw material charging apparatus for the sintering machine according to the first embodiment.
FIG. 4 is a front view showing a chute in the raw material charging apparatus according to the first embodiment.
5 is a cross-sectional view taken along line AA in FIG.
FIG. 6 is a vertical cross-sectional view showing a raw material charging apparatus for a sintering machine according to the second embodiment.
FIG. 7 is a vertical cross-sectional view showing a raw material charging apparatus for a sintering machine according to the third embodiment.
FIG. 8 is a vertical cross-sectional view showing a raw material charging apparatus for a sintering machine according to the fourth embodiment.
FIG. 9 is a graph showing the distance between adjacent rods in the chute used in this embodiment.
FIG. 10 is a graph showing a shape curve of a chute according to an example of the present embodiment.
FIG. 11 is a graph showing the shape curve of the chute of Comparative Example 1 in the present embodiment.
FIG. 12 is a graph showing the shape curve of the chute of Comparative Example 2 in the present embodiment.
FIG. 13A is a graph showing the ratio of CaO in the raw material layer in the example of the present embodiment.
FIG.13 (b) is a graph which shows the ratio of CaO in the raw material layer in the comparative example 1 of this embodiment.
FIG.13 (c) is a graph which shows the ratio of CaO in the raw material layer in the comparative example 2 of this embodiment.
FIG. 14A is a graph showing the average particle diameter and the ratio of C in the raw material layer in the example of the present embodiment.
FIG. 14B is a graph showing the average particle diameter and the ratio of C in the raw material layer in Comparative Example 1 of the present embodiment.
FIG.14 (c) is a graph which shows the average particle diameter and the ratio of C in the raw material layer in the comparative example 2 of this embodiment.

  The inventors pay attention to the rate of change of the gradient of the straight line connecting adjacent rods (conceptually, a value obtained by second-order differentiation of the shape curve of the chute), and set the rate of change of this gradient within a predetermined range. As a result, it was found that the particles change their traveling direction and the speed is appropriately reduced, and the particles can be dispersed uniformly over the entire length of the chute.

  The raw material charging device to the sintering machine of the present invention includes a raw material supply mechanism for supplying a raw material for sintering to a pallet, an upper end thereof being positioned in the vicinity of the raw material supply mechanism, and a lower end thereof being the pallet And a chute that is inclined in a direction opposite to the moving direction of the pallet. The chute is composed of a plurality of rods arranged in parallel at a predetermined interval from the upper end to the lower end in the width direction of the pallet, and curved in a concave shape from the upper end toward the lower end. Has a shape. The average change rate of the gradient connecting the adjacent rods in the range corresponding to the upper end side 1/3 of the horizontal length of the chute is the gradient change rate in the range corresponding to the lower end side 2/3. The average value is 1.5 to 10 times.

  According to the present invention, an appropriate amount of raw material falls on the chute, and the distribution of the amount of fall in the chute device length direction (the direction of travel of the raw material particles and the charging pallet) is dispersed. Therefore, a raw material layer having large segregation and an appropriate charging density can be obtained, and the sintering yield and the production rate can be improved.

  Hereinafter, the raw material charging apparatus according to the first embodiment will be described with reference to the accompanying drawings. FIG. 3 is a schematic vertical sectional view of the raw material charging apparatus. This raw material charging apparatus includes a raw material supply mechanism for supplying the raw material 107 to the pallet 105 and a chute 114.

  The raw material supply mechanism includes a belt-type feeder 103 that uniformly places the raw material 107 in the width direction and moves the raw material 107 in the direction of the arrow.

  The chute 114 has an upper end positioned near the discharge end of the belt-type feeder 103, a lower end positioned above the pallet 105, and is inclined in a direction opposite to the moving direction of the pallet 105. The guide chute 117 is a plate-like chute positioned between the discharge end of the belt type feeder 103 and the upper end of the chute 114. When the raw material 7 enters the chute 114 at an appropriate angle and speed, the guide chute 117 is not always necessary.

  4 shows a front view of the chute, and FIG. 5 shows a cross-sectional view taken along line AA of FIG. The chute 114 is formed in a screen shape including a plurality of rods 115 arranged in parallel with a predetermined distance from the upper end to the lower end in the width direction of the pallet 105. The rod includes a linear member such as a wire. The chute 114 is formed in a gentle concave shape from the upper end to the lower end. Further, the chute 114 has a range in which the average value of the change rate of the gradient connecting the adjacent rods 115 in the range L1 corresponding to the upper end side 1/3 of the horizontal length L corresponds to the lower end side 2/3. It is formed so as to be 1.5 times to 10 times the average change rate of the gradient in L2. The connecting member 116 connects the plurality of rods 115 constituting the chute 114 to each other at a predetermined interval. For example, four connecting members 116 are attached at a predetermined interval in the width direction of the rod 115. The gap between the rods 115 is generally smaller on the upper end side 114a of the chute 114 than on the lower end side 114b, but does not need to be uniformly enlarged from the upper part to the lower part. For example, in the middle of the rods at the upper end and the lower end, it is possible to arrange the rods so that the lower side becomes smaller at some adjacent rod intervals, and further increases again at the lower portion so that the rod interval is larger than the upper end side. .

  When the raw material 107 discharged from the discharge end of the belt-type feeder 103 through the guide chute 117 slides down on the chute 114 formed in the concave surface, some particles of the raw material 107 collide with the rod 115. Then, it is bent one after another so as to lift the traveling direction upward. At this time, the average value of the change rate of the gradient connecting the adjacent rods 115 in the range L1 corresponding to the upper end side 1/3 is greater than the average value of the change rate of the gradient in the range L2 corresponding to the lower end side 2/3. If the rod 115 is arranged so as to be 1.5 times to 10 times, specifically, the particles change their traveling direction and their speed is appropriately reduced, and the chute 114 is uniformly distributed over the entire length. Can drop particles. That is, of the raw material discharged through the guide chute 117, a part of the coarse particles slide down on the chute 114 composed of the plurality of rods 115, and the remaining coarse particles pass through the lower part of the chute 114. It drops from a wide gap between a plurality of constituting rods 115 and is supplied onto the great bar 106 in the pallet 105 that continuously moves. On the other hand, the fine raw material falls from a narrow gap between the plurality of rods 115 constituting the upper portion of the chute 114 and is supplied onto the great bar 106 in the pallet 105. Therefore, the amount of raw material particles falling directly below the chute 114 is dispersed in the apparatus length direction. Thus, the coarse raw material is supplied to the lower layer 107a in the pallet 105, the fine raw material is supplied to the upper layer 107b, and the fine raw material layer becomes finer toward the upper part. For this reason, the raw material layer in which the particle size segregated is formed. Moreover, by segregation, C and CaO in the raw material layer gradually increase from the lower layer to the upper layer, and a sintered ore having excellent quality can be manufactured with a high yield. Furthermore, since the raw material 107 is dispersed and dropped, a drop impact on the pallet 105 is reduced, and a raw material layer with good air permeability that is softly charged can be obtained.

When the rod arrangement is on a curve defined by a function, the rate of change of the slope of the straight line connecting the rod centers can be calculated from the second-order differential value at each rod center position of this function. Even when the arrangement of the rod center positions is not defined by a function, it can be simply calculated by Equation 1 below.
{(Y3-y2) / (x3-x2)-(y2-y1) / (x2-x1)} / (x3-x1)
= {(Y3-y2) (x2-x1)-(y2-y1) (x3-x2)} / {(x2-x1) (x3-x2) (x3-x1)}
... Formula 1
If the change rate of the gradient is calculated from the three adjacent rod center positions from the above formula 1 to determine the arrangement of the rods, the effect of the present invention can be achieved.

  Since this simple calculation method is defined by three points, the gradient change rate is not calculated for the rods at both ends of the chute. That is, for a chute composed of n rods, the average value is calculated for the gradient change rate at n-2 points, taking the horizontal range into consideration. Since the effectiveness of this arrangement of the rod is obtained by the flow of the raw material on the rod, the rod arranged at a position where the raw material cannot physically flow does not fall within the range when considering the horizontal length of the chute. exclude.

  Here, the average value of the gradient change rate connecting adjacent rods in the range L1 corresponding to the upper end side 1/3 is equal to the average value of the gradient change rate in the range L2 corresponding to the lower end side 2/3. If it is larger than 10 times, the deceleration of the particles becomes too large, and all the raw material falls in the middle of the chute 114. On the other hand, if it is smaller than 1.5 times, the deceleration of the particles in the range L1 on the upper end side 1/3 of the chute is small, and the particles proceed to the range L2 on the lower end side 2/3 at a large downhill speed. Since the average value of the gradient change rate in the range L2 is smaller than the average value of the gradient change rate in the range L1, a sufficient deceleration effect cannot be obtained, and the rate at which particles fall from the gap between the rods 115 is low. As a result, most of the particles jump out of the lower end of the chute 114.

  It should be noted that changing the traveling direction of the particles, controlling the rate at which the particles are dropped from the gap of the rod 115 without decelerating the particles, and evenly dropping the particles directly under the chute 114 means that the portion to be dropped This can be achieved by adjusting the gap between the rods 115, but if the gap is widened, all particles will fall from the gap, and a raw material layer with segregated particle size cannot be obtained.

  FIG. 6 shows a raw material charging apparatus in the second embodiment. In this raw material charging apparatus, the raw material supply mechanism is composed of a hopper 101 in which the raw material 107 is charged and has a cut-out gate 101a in the lower portion of the side wall, and a roll feeder 102 provided in the lower end opening of the hopper 101. Different from the first embodiment.

  FIG. 7 shows a raw material charging apparatus in the third embodiment. In this raw material charging apparatus, the raw material supply mechanism has a hopper 101 in which the raw material 107 is charged and has a cut-out gate 101a at the lower portion of the side wall, and a roll feeder 102 provided at the lower end opening of the hopper 101, and further a second Unlike the first embodiment, the roll feeder 118 is provided obliquely below the roll feeder 102. The roll feeder 118 is provided obliquely below the cutting gate 101a. By rotating the roll feeder 118, it is possible to adjust the entry angle of the raw material to the chute and the auxiliary speed.

  FIG. 8 shows a raw material charging apparatus in the fourth embodiment. In this raw material charging apparatus, the raw material supply mechanism has a hopper 101 in which a raw material 107 is charged and has a cut-out gate 101a at the lower portion of the side wall, and a roll feeder 102 provided at the lower end opening of the hopper 101, and below that. It has a plurality of rollers 119 arranged in a straight line. The entrance angle of the raw material into the chute can be adjusted by the roller 119.

Examples of the invention will be described in comparison with comparative examples. The raw material charging apparatus of one embodiment shown in FIGS. 3 to 5 was used to supply the raw material into the pallet. The configuration of the chute in the apparatus is as follows.
1) Chute shape curve:
y = − {√ (0.456 + 0.12x)} / 0.06 + 11.26, where x ≧ 0 was used. However, x and y are cm values 2) Rod diameter: 11.5 mm
3) Number of rods: 22 4) Rod spacing: as shown in FIG. In this figure, the horizontal axis indicates the rod number, and the vertical axis indicates the distance between adjacent rods (wires). The rods are numbered 1, 2, 3,... 21 in order from the upper end side to the lower end side. The distance between the rods is set so that the upper end side is smaller than the lower end side, and gradually increases from the vicinity of the upper end side 1/3.
5) [Average value of change rate of gradient connecting adjacent rods in the range corresponding to the upper end side 1/3 of the horizontal length] / [corresponding to the lower end side 2/3 of the horizontal length] Average value of change rate of gradient connecting adjacent rods in range L2] = R
R = 6.5
A chute shape curve is shown in FIG. In FIG. 10, the horizontal axis indicates the horizontal distance (cm) from the upper end of the chute, and the horizontal axis indicates the vertical distance (cm) from the upper end of the chute. From this figure, it can be seen that the chute is formed as a parabola.

Next, the configuration of the chute of the comparative example will be described. First, Comparative Example 1 will be described.
1) Chute shape curve:
In y ⁼ 0.012x 2 -1.483x, with curved portions of the x ≧ 0. However, x and y are cm values 2) The diameter and the number of rods are the same as in the embodiment 3) R = 1.0
The chute shape curve of Comparative Example 1 is shown in FIG. In FIG. 11, the horizontal axis indicates the horizontal distance (cm) from the upper end of the chute, and the horizontal axis indicates the vertical distance (cm) from the upper end of the chute. From this figure, it can be seen that the chute is formed as a parabola. When the comparative example is compared with the embodiment, in the comparative example, the change rate of the gradient in the range of the upper end side 1/3 of the chute is smaller than the change rate of the gradient in the lower end side 2/3 of the chute. Recognize.

Next, Comparative Example 2 will be described.
1) Chute shape curve:
The curve of y = 50000 / (x + 12) ³ −28.94 and x ≧ 0 was used. However, x and y are cm values 2) The diameter and the number of rods are the same as in the embodiment 3) R = 88
The shape curve of the chute of Comparative Example 2 is shown in FIG. In FIG. 12, the horizontal axis indicates the horizontal distance (cm) from the upper end of the chute, and the horizontal axis indicates the vertical distance (cm) from the upper end of the chute. From this figure, it can be seen that the chute is formed in a cubic curve. When the comparative example is compared with the example, in the comparative example, the rate of change of the gradient in the range of the upper end side 1/3 of the chute is extremely large compared to the rate of change of the gradient in the lower end side 2/3 of the chute. I understand.

  FIG. 13 and FIG. 14 show the height in the layer direction and the average particle size in the layer, the proportion of C and CaO when the raw materials are supplied into the pallet using the devices of the above-described examples and comparative examples. It is a graph which shows a relationship.

  First, the average particle diameter will be described. The average particle size of the example gradually increases from the upper layer to the lower layer. The difference between the particle size of the upper layer and the particle size of the lower layer is about 4.5 mm−2.5 mm = 2 mm. On the other hand, the particle size difference of Comparative Example 1 is 4.2 mm-2.75 mm = 1.45 mm. Moreover, the difference of the particle size of the comparative example 2 is 4.1 mm-2.8 mm = 1.3 mm. Therefore, it can be seen that in the Examples, a raw material layer having a large classification effect, that is, a large particle size segregation is obtained. Further, in the examples, the average particle diameter increases from the upper layer to the lower layer at a substantially constant ratio, whereas in Comparative Examples 1 and 2, the increase ratio of the average particle diameter is higher in the upper layer. And the lower part of the layer.

  Next, the ratio of C will be described. The proportion of C in the example gradually increases from the lower layer to the upper layer. The difference between the lower layer ratio and the upper layer ratio is 3.75 wt. % -3.1 wt. % = 0.65 wt. %. On the other hand, the difference in the ratio of Comparative Example 1 is 3.7 wt. % -3.25 wt. % = 0.45 wt. %. Moreover, the difference of the ratio of the comparative example 2 is 3.7 wt. % -3.35 wt. % = 0.35 wt. %. Therefore, in the Example, it turns out that a raw material layer with a large C segregation is obtained. Further, in the examples, the C ratio increases at a substantially constant ratio from the lower layer to the upper layer, whereas in Comparative Examples 1 and 2, the change rate of the C ratio is the upper layer and the lower layer. And will change.

  Finally, the proportion of CaO will be described. FIG. 13 is a graph showing the relationship between the height in the layer direction and the ratio of CaO in the layer when the raw materials are supplied into the pallet using the devices of the above-described examples and comparative examples. The proportion of CaO in the example increases from the lower layer to the upper layer. The difference between the lower layer ratio and the upper layer ratio is 10.1 wt. % -7.9 wt. % = 2.2 wt. %. On the other hand, the difference in the ratio of Comparative Example 1 is 9.6 wt. % -8.2 wt. % = 1.4 wt. %. Moreover, the difference of the ratio of the comparative example 2 is 9.6 wt. % -8.5 wt. % = 1.1 wt. %. Therefore, in the Example, it turns out that a raw material layer with a large CaO segregation is obtained. In the examples, the CaO ratio increases from the lower layer to the upper layer at a substantially constant ratio, whereas in Comparative Examples 1 and 2, the rate of change of the CaO ratio is the upper layer and the lower layer. And will change.

DESCRIPTION OF SYMBOLS 1 Hopper 2 Roll feeder 3 Raw material for sintering 4 Flat plate chute 5 Rope or rod 6 Sinter pallet 7 Slit-shaped gap 8 Raw material layer 9 Grain segregation charging mechanism 10 Drum feeder 101 Hopper 101a Cutting gate 102 Roll feeder 103 Belt type Feeder 105 Pallet 106 Great bar 107 Raw material 107a Lower layer 107 of raw material 107 Upper layer of raw material 107 114 Chute 114a Upper end side of chute 114 114b Lower end side of chute 114 115 Rod 116 Connecting member 117 Guide chute 118 Roll feeder 119 Roller

Claims (4)

The raw material charging equipment to the sintering machine consists of:
A raw material supply mechanism for supplying sintering raw materials to the pallet;
A chute that is inclined in a direction opposite to the moving direction of the pallet, the upper end of which is located in the vicinity of the raw material supply mechanism, and the lower end of which is located above the pallet;
The chute is composed of a plurality of rods arranged in parallel at a predetermined interval from the upper end to the lower end in the width direction of the pallet,
The chute has a concave curved shape from its upper end to its lower end,
The average change rate of the gradient connecting the adjacent rods in the range corresponding to the upper end side 1/3 of the horizontal length of the chute is the gradient change rate in the range corresponding to the lower end side 2/3. The average value is 1.5 to 10 times.   2. The raw material charging apparatus for a sintering machine according to claim 1, wherein the raw material supply mechanism comprises a belt type feeder.   2. The raw material charging apparatus for a sintering machine according to claim 1, wherein the raw material supply mechanism includes a hopper charged with the raw material and having a cut-out gate at a lower portion and a roll feeder provided at a lower end of the hopper.   The raw material supply mechanism comprises a hopper charged with raw materials and having a cut-out gate at the bottom, a roll feeder provided at the lower end of the hopper, and a plurality of rollers arranged linearly below the roll feeder. The raw material charging apparatus to the sintering machine of Claim 1.

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