JP2000063961A - Method and device for charging raw material into sintering machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the collapse (landslide phenomenon) of a packed bed by arbitrarily regulating the angle of inclination of a roller feeder and the number of revolution of each roll to obtain the target grain size segregation of the packed bed of a raw sintering material on a pallet. SOLUTION: It is important to set the grain size segregation large in the vertical direction of a packed bed concerning the coking speed passing in the packed bed on a pallet of a sintering machine. Thus, the regulation is effected by appropriately combining the angle of inclination of roll rows, the number of revolution of each roll and the interval of each roll when a raw material is charged by a roller feeder. Thus, the density distribution in the vertical direction of the packed bed is controlled thereby. That is, by dropping the raw material from a gap between the rolls of the roller feeder, the quantity of the raw material to be dropped from the roller feeder s reduced, the frequency that the angle of inclination at an end part of the loaded raw material layer (packed bed) is larger than the angle of repose is reduced, and generation of the landslide phenomenon can be suppressed.

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 device for supplying and charging raw materials onto a pallet in an endless moving grade type sintering machine and a sintering method using the same.

[0002]

2. Description of the Related Art Sintered ore is manufactured as follows. A raw material obtained by mixing and granulating iron ore powder, powdery coke, powdery flux and the like is supplied into a continuously moving pallet of an endless moving great type sintering machine. The pallet supplied with such a raw material is sequentially passed through the ignition zone and the firing zone, and the powdery coke on the surface of the raw material in the pallet is ignited in the ignition zone, and the combustion gas of high temperature generated by the combustion is burned. In, the raw material in the pallet is heated and fired by sucking downward by a wind box provided below the pallet. Thus, the raw materials in the pallet are fired and become sinter, which is discharged from the downstream end of the sinter machine.

When the sintering raw material is charged into the pallet from the ore feeder, the upper layer portion contains more coke than the lower layer portion,
In addition, it is effective to charge the lower layer so that the grain size of the raw material is coarser than that of the upper layer in order to improve the quality, improve the sintering yield, reduce the basic unit of ignition fuel and improve the productivity. Is well known.

FIG. 14 shows an outline of a conventional raw material charging device.
The raw material charging device shown in FIG. 14 (a) is composed of a hopper 21 into which the raw material M is charged, a drum feeder 22 as a raw material supply mechanism provided at the lower end opening of the hopper 21, and a shout 23 located below the drum feeder. There is. The chute 23 is in the form of a flat plate having substantially the same width as the pallet 24, and is inclined at a predetermined angle in the direction opposite to the moving direction of the pallet 24 indicated by the arrow A. The raw material M in the hopper 21 is continuously discharged by the rotation of the drum feeder 22, and is supplied onto the great bar 25 in the pallet 24 via a flat plate-shaped chute 23 inclined at a predetermined angle.

This device has the following problems. The raw material M supplied from the drum feeder 22 slides down on a flat plate-shaped chute 23 and is supplied into the pallet 24. Therefore, the impact when the raw material M is dropped into the pallet 24 and the angle of repose of the raw material layer increase, and an avalanche phenomenon occurs in the raw material layer and a fault occurs. As a result, the grain size segregation of the raw material M in the layer height direction in the pallet 24 and the distribution of the powder coke accompanying it become non-uniform, and the aeration phenomenon occurs in the fault caused by the avalanche phenomenon, and the sintering pot yield and production Sex decreases. In order to solve the above-mentioned problems, many studies have been made in the past.
No. 83596 proposes a raw material charging device using a rotating roll 26 shown in FIG. 14 (b). In this raw material charging device, a large number of rotating rolls 26 arranged in parallel on the same plane and inclined in the direction opposite to the traveling direction of the pallet 24 of the sintering machine by rotating in the same direction are provided. Gap 27 between rolls 26
It is configured such that it gradually increases as it goes from the upstream side to the downstream side.

According to this invention, when the sintering raw material M is supplied onto the rotating roll 26, the powder particles having a larger particle diameter gradually pass through the respective gaps from the upstream side to the downstream side. In this case, the moving direction of the moving pallet 24 and the sintering raw material M
Since the feeding direction is opposite to the feeding direction, the sintering raw material M charged on the moving pallet 24 becomes a layer in which the grain size is segregated such that the grain size gradually decreases from the lower layer portion to the upper layer portion. In this case, since the sintering raw material M loaded onto the moving pallet 24 is mechanically sieved during the transportation by the rotation of each rotary roll 26, the particle size classification of the sintering raw material M is ensured, and thus the sintering is performed. It is stated that the raw material M can be reliably knitted on the moving pallet 24 and laminated.

Further, in Japanese Patent Laid-Open No. 5-1335, a screen-shaped chute consisting of a plurality of rods 28 shown in FIG.
A raw material charging device using 23 has been proposed. In this raw material charging device, a chute 23 for supplying raw material into the pallet 24 is used.
The belt feeder 27 and the pallet 24
The pallet 24 is installed so as to be inclined in a direction opposite to the moving direction of the pallet 24. The chute 23 is formed in the width direction of the pallet 24 in the form of a screen consisting of a plurality of rods 28 arranged in parallel with each other at a predetermined distance from the upper end to the lower end, and at least the lower part thereof is a pallet. It is formed in a gentle concave shape toward the lower end located above 24. The interval between the plurality of rods 28 forming the upper portion 23a of the chute 23 is configured to be smaller than the interval between the plurality of rods 28 forming the lower curved portion 23b.

According to the present invention, a part of the coarse material Ma of the sintering material M discharged from the discharge end of the belt type feeder 27 through the guide chute 29 is a plurality of rods.
It slides down on a screen-shaped chute 23 made of 28, and part of it falls from a wide gap between a plurality of rods 28 that form a curved lower portion 23b, and a pallet 24
Supplied on the Great Bar 25 inside. On the other hand, the fine-grained raw material Mb is composed of a plurality of rods 28 that constitute the planar upper portion 23a.
Coarse-grained raw material M in the pallet 24 is dropped from the narrow space between
Supplied on a. Therefore, in the pallet 24, a raw material layer is formed, in which the coarse grain raw material Ma as the lower layer and the fine grain raw material Mb as the upper layer that becomes finer toward the upper portion and whose grain size is segregated. Further, the adjustment of the grain size segregation degree can be changed by adjusting the intervals between the plurality of rods 28, the inclination angle (θ) of the planar upper portion 23a of the chute 23, and the bending degree of the lower chute 23b thereof. Is stated.

Japanese Patent Publication No. 6-27291 proposes a raw material charging device described below. In this raw material charging device, as shown in FIG. 16, a large number of rods 30 extending in the pallet progress are provided above the pallet 24, and at least one end side of the rods 30 is staggered in three stages or more when viewed from the side. Tilt the bar 30 so that the end on the pallet entry side of the bar 30 is lower than the end on the pallet exit side.
It is configured to charge the sintering raw material through 30.

According to the present invention, since the raw material M dropped from the drum feeder 22 is once received by the bar material 30 to reduce the drop energy, it can be loaded into the pallet 24, so that the loading density can be reduced. Further, by making at least one end side of the bar 30 different in three stages or more when viewed from the side, the charging raw material can smoothly pass between the bars 30 and be charged into the pallet 24. Further, by arranging the bar 30 so that the end of the bar 30 on the pallet entry side is lower than the end on the pallet exit side, the supplied raw material M is temporarily placed on the bar 30. After dropping, most of the fine grains pass through the gaps between the rods 30 and fall downward, but the coarser grains roll in the gaps between the rods 30 and move to the lower direction of the inclined rods 30. It is said that since the raw material layer after charging is low in density, it is possible to obtain an ideal packed bed in which segregated charging of fine particles in the upper layer and coarse particles in the lower layer is carried out.

[0011]

However, the sintering raw material is usually composed of 5 to 10 brands of powdered ore, SiO ₂ -based raw material for flux, and powdered limestone. The particle size composition of the raw material changes. If a large amount of so-called low-cost raw material such as highly crystalline water ore is used as the sintering raw material for the purpose of reducing the production cost of the sintered ore, the pressure loss of the packed bed during firing increases, resulting in a large productivity increase. descend. Therefore, when low-priced raw materials are mixed, a raw material charging method for controlling the air permeability of the packed bed is required. Therefore, there is a need for a raw material charging method capable of controlling the particle size segregation, density distribution, etc. of the raw material packed bed according to the mixing ratio of brands such as powdered ore and the quality of the used powdered ore.

From this point of view, the above-mentioned Japanese Utility Model Laid-Open No. 63-8359.
No. 6 has the following problems. In the conventional roll feeder, the spacing between the rolls, the inclination, and the rotation speed of each roll are fixed, so changes in the raw material particle size composition directly affect the stacking state (particle size segregation, density distribution) of the sintering raw materials on the pallet. There is a problem that it adversely affects the productivity, strength, and pot yield of sinter. Furthermore, when the charging amount to the sintering machine is changed to change the production amount of the sintered ore, or when the amount of the returned ore is changed and the mixing ratio of the returned ore is changed accordingly, the amount of the charged to the sintering machine is also changed. However, conventional roller feeders cannot handle sieving and changes in the charging state, which adversely affects the operating results of the sintering machine.

Further, Japanese Patent Laid-Open No. 5-1335 has the following problems. In the lower curved chute 23 consisting of rods 28 with different intervals in the upper part and lower part, if the interval and the degree of curvature match the raw material supply amount and the grain size segregation of the raw material ore, the grain size on the pallet 24 is close to ideal. Although a packed layer having segregation can be formed, for example, when the raw material supply amount increases, the thickness of the raw material layer flowing on the chute 23 increases,
Since the amount of the fine-grained raw material that falls from the interval between the rods 28 decreases, a layer in which the fine-grained raw material is mixed is formed in the lower layer portion on the pallet 24. Further, since the amount of raw material flowing in the lower portion 23b (curved portion) of the chute 23 increases, the number of times an avalanche phenomenon and a fault are generated due to a shock at the time of dropping increases. As a result, the grain size segregation in the height direction in the pallet 24 and the accompanying distribution of C and CaO become non-uniform, and the yield of the sintering pot and the productivity decrease.

Further, as the adjustment method when the raw material supply amount or the like changes, there are the inclination angle (θ) of the chute upper portion 23a and the interval adjustment between the plurality of rods 28, and the like. ) Adjustment cannot cope with a large change, and the adjustment of the distance between the rods 28 requires the stop of the sintering machine, which causes an increase in operating cost and an expense of adjusting the distance between the rods 28. The problem arises.

Further, Japanese Patent Publication No. 6-27291 has the following problems. If the intervals and inclination angles of the rods 30 match the raw material supply amount and the grain size segregation of the raw material ore, the pallet
A packed bed having a particle size segregation close to ideal can be formed on 24, but for example, if the amount of raw material supplied increases, the thickness of the raw material layer flowing on the rod 30 will increase and the gap between the rods 30 will increase. Since the proportion of the fine-grain raw material that falls down decreases, a layer in which the fine-grain raw material is mixed is formed in the lower layer portion on the pallet 24. Also, bar material
Since the ratio of raw material flowing in the lower direction of 30 increases, the number of occurrences of avalanche phenomenon and fault due to impact at the time of falling increases. As a result, the grain size segregation in the height direction in the pallet 24 and the accompanying distribution of C and CaO become non-uniform, and the yield of the sintering pot and the productivity decrease.

As a method of adjustment when the raw material supply amount changes, there are adjustments of the inclination angle of the rods 30 and the intervals between the rods 30. This is not possible, and the adjustment of the distance between the rods 30 requires the stop of the sintering machine, which raises the problem of increased operating costs and costs for changing the distance between the rods 30.

The present invention has been made to solve the above-mentioned problems, and a sintering raw material is charged from a feeder under a feed hopper of a sintering machine onto a sintering machine pallet via a roller feeder. In this method, the particle size segregation of the raw material packed bed, the density distribution, etc. are controlled according to the blending ratio of the brand such as powdered ore, the quality of the used powdered ore, and the collapse of the packed bed (avalanche phenomenon)
It is an object of the present invention to provide a raw material charging method and a charging apparatus for suppressing the above.

[0018]

[Summary of the Invention] The gist of the present invention is a method for charging a sintering raw material from a feeder under a feed hopper of a sintering machine onto a sinter machine pallet via a roller feeder. This is a raw material charging method for a sintering machine in which a target grain size segregation of a sintering raw material packed bed is obtained on a pallet by arbitrarily adjusting an angle and a rotation speed of each roll.

In the method of charging the sintering raw material from the feeder under the feed hopper of the sintering machine onto the pallet of the sintering machine via the roller feeder, the roll interval of the roller feeder is set between the upstream side and the downstream side of the roller feeder. This is a raw material charging method for a sintering machine, which is modified to control the particle size segregation and density distribution of the sintering raw material packed layer on the pallet and to suppress the collapse (avalanche phenomenon) of the sintering raw material packed layer on the pallet. .

Further, the roll interval of the roller feeder is set to be narrower on the upstream side of the roller feeder than on the downstream side, and in addition to controlling the particle size segregation and the charging density distribution of the sintering raw material packed bed on the pallet, This is a method for charging a raw material for a sintering machine, which suppresses the collapse (avalanche phenomenon) of the sintering raw material packed bed on the pallet.

In the raw material charging apparatus of the present invention, a feed mechanism (usually a drum feeder) is installed under the feed hopper, the upper end is connected to the feed mechanism, and the lower end is arranged on the sinter machine pallet. Consists of multiple shots,
A row of lateral rolls, each of which is provided so as to be changeable at a predetermined interval, a support stand on which bearings that support both ends of the row are placed, an inclination changing means provided on the support stand, and the rolls. Is a raw material charging device for a sintering machine, which is provided with a driving means capable of varying the rotation speed.

The sintering time depends on the burning rate of the flame passing through the packed bed on the pallet of the sintering machine, and becomes shorter as the burning rate becomes faster. Further, the burn-off speed is proportional to the particle size segregation of the raw material in the height direction of the packed bed. This particle size segregation has a large value when the supplied raw material is charged in the vertical direction of the packed bed on the pallet, the upper part has a finer average particle size, and the lower part is coarser. The above-mentioned relationship between the sintering time and the grain size segregation is as shown in Fig. 13 from the past sintering operation data.

Therefore, it is important to increase the particle size segregation in the vertical direction of the packed bed. It is possible to increase this grain size segregation in the vertical direction of the packed bed by optimally combining the inclination angle of the roll row, the rotation speed of each roll, and the interval between each roll when charging the feedstock raw material with the roller feeder. Becomes Further, by adjusting the inclination angle of the roll row, the rotation number of each roll and the interval between the rolls in this way, the density distribution in the vertical direction of the packed bed can be controlled, and the avalanche phenomenon due to the collapse of the packed bed is more effective. Can be suppressed.
That is, by dropping the raw material from the gap between the rolls of the roller feeder, the amount of raw material that falls from the lower end of the roller feeder is reduced, and the inclination angle of the end portion of the stacked raw material layer (filled layer) is at a rest. The occurrence of the avalanche phenomenon can be suppressed by reducing the frequency of becoming larger than the corner.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be specifically described below with reference to Examples.

[0025]

[Example 1] Using a real-scale roller feeder having the configuration shown in Fig. 11 as a raw material for sintering, the charging speed, the feeder inclination angle, and the roll rotation speed were changed under the following experimental conditions,
Loaded on a moving pallet. After that, each part was cut out in the vertical direction of the packed bed on the pallet and the particle size distribution was measured to calculate the average particle size. The result is shown in FIG. Then, it was determined whether the degree of segregation was good, good, or bad according to the gradient of the average particle size in the height direction of the packed bed.

Roller feeder equipment conditions Roll diameter: 60mm Number of rolls: 8 Roll speed: 100-250rpm Shooting angle: 30-50 ° Roll gap: 20mm

Experimental conditions Raw material used: Pseudo particles collected from actual sintering plant Water content: 7.0% by mass Raw material charging speed: 175kg / min, 264kg / min Shoot angle: 30 °, 40 °, 50 ° Roll rotation speed: 100 rpm, 150 rpm, 200 rpm, 250 rpm Roll interval: constant (20mm)

[0028]

[Table 1]

From this table, when the sintering raw material was loaded on the pallet via the roller feeder, the segregation degree was changed by changing the operating elements (angle, rotation speed) of the roller feeder according to the loading amount. It can be seen that adjustments can be made to obtain the proper sinter loading. In other words, it is possible to improve the productivity by shortening the sintering time under the given conditions of the sintering raw material. Further, as shown in FIG. 1, it is possible to adjust the average particle size in the height direction of the filling layer by changing the angle of the roller feeder.

[0030]

[Example 2] A sintering raw material was charged using a full-scale roller feeder under the following facility conditions, the charging speed, the feeder inclination angle,
The roll rotation speed and roll interval were changed under the following experimental conditions, and the rolls were placed on a moving pallet. After that, each part was cut out in the vertical direction of the packed bed on the pallet, and the particle size distribution measurement and the charging density distribution measurement were performed. The state of avalanche phenomenon was observed during charging.

Roller feeder equipment conditions Roll diameter: 60mm Number of rolls: 8 Roll speed: 70 ~ 250rpm Shoot angle: 30 to 50 ° Roll gap: 17-22mm

Experimental conditions Raw material: Water content of pseudo particles taken from the actual sintering plant: 7.0 mass% Raw material charging speed: 126kg / min Shoot angle: 40 ° Roll rotation speed: 70rpm, 118rpm Roll interval: Constant (20mm) , Uneven (upstream side 17mm, downstream side 22mm)

As shown in FIG. 6, the roll spacing in the comparative example is 8 rolls at a 20 mm spacing for the constant roll spacing, and the non-uniform roll spacing in the invention is 4 upstream rolls at a 17 mm spacing. Five rolls on the downstream side are set at 22 mm intervals.
Further, as a comparative example, charging was performed using a flat plate-shaped sloping chute.

The raw material particle size distribution in the vertical direction of the packed bed is shown in FIG. FIG. 2 shows the particle size ratio at each position of the packed bed when the average particle size of the entire raw material is set to 1. In the example of the present invention, the roll spacing is narrower on the upstream side and wider on the downstream side. , The particle size ratio is from the top to the middle of the packed bed (100 to 200 mm from the surface
) Is smaller than the lower part of the packed bed (300 to 400 mm from the surface). On the other hand, in the charging by the sloping chute of the comparative example, the particle size ratio in the upper part of the packed bed is larger than that of the example of the present invention.

The slope of the average particle size distribution curve for each charging mode is shown in FIG. The degree of particle size segregation can be evaluated by the slope of the average particle size distribution curve, and the smaller the slope of the average particle size distribution curve, the greater the degree of particle size segregation. Therefore, as shown in FIG. 3, it can be seen that the example of the present invention in which the roll intervals are nonuniform has a small slope of the average particle size distribution curve and a large particle size segregation degree.
On the other hand, in the charging by the sloping chute of the comparative example, it can be seen that the slope of the average particle size distribution curve is large and the degree of particle size segregation is small.

FIG. 4 shows the raw material charge density distribution in the vertical direction of the packed bed.
Fig. 5 shows the frequency of occurrence of the avalanche phenomenon for each charging mode.
As shown in FIG. 4, in the raw material charging density, in the present invention example, the roll interval on the upstream side is narrower than that on the downstream side, and small raw material particles are dropped on the upstream side.
The raw material charging density in) is smaller. Further, as the raw material charging density in the upper part of the packed bed becomes smaller, the frequency of occurrence of the avalanche phenomenon is reduced to one half or less of the comparative example, as shown in FIG.

From the above results, when charging the sintering raw material onto the pallet through the roller feeder, the grain size segregation and the raw material charging density are controlled by making the roll interval on the upstream side narrower than that on the downstream side. It can be seen that the avalanche phenomenon can be suppressed and the raw material can be properly charged into the sintering machine. In other words, under the condition of the given sintering raw material, it is possible to charge the raw material while ensuring the air permeability, and it is possible to shorten the sintering time and improve the productivity.

[0038]

[Embodiment 3] As shown in FIG. 8 below the roller feeder, the first and second boundaries of a 100 mm long sampling box are placed directly below the center of the uppermost roll.
No. 10 to No. 11, a total of 11 sampling boxes were installed. The distance between the center of the roll at the bottom and the top of the sampling box is 355 mm. After supplying the raw material for a predetermined time, the weight of the raw material accumulated in the sampling box was measured. The result is shown in FIG. 7. The average particle size of the sintering raw material is 3.30 mm.

Roller feeder equipment conditions Roll diameter: 60mm Number of rolls: 8 Roll speed: 100-250rpm Shooting angle: 30-50 ° Roll gap: 17-22mm

Experimental conditions Raw material used: Pseudo particles collected from actual sintering plant Water content: 7.0% by mass Raw material charging speed: 523kg / min Shoot angle: 40 °, 50 ° Roll rotation speed: 0 rpm, 100 rpm, 150 rpm Roll interval: constant (17 mm)

As shown in FIG. 7, when the chute angle is 50 °, the form of dispersion of the raw material does not change much even if the roll speed is changed, but when the chute angle is 40 °, the roll speed is 0, As the speed is increased to 100 rpm and 150 rpm, the amount of raw material that falls between the rolls decreases, and the amount of raw material that falls away from the roller feeder (the lowest roll) increases. In other words, when the chute angle is 40 °, the roll rotation speed can be changed to adjust the dropping position of the raw material. When the chute angle is 50 °, the speed of the raw material flowing on the roller feeder increases as the angle increases.Therefore, even if the roll speed is changed, the dispersion form of the raw material should be changed as much as when the chute angle is 40 °. It is presumed that this is impossible.

As described above, the form of raw material dispersion charging can be controlled only by adjusting the roll rotation speed if the chute angle is set to 35 to 45 °. When the raw material supply amount is significantly increased, the ratio of the raw material falling between the rolls is relatively reduced. However, if the roll rotation speed is set to a low speed, it is possible to make the ratio of the raw materials falling from between the rolls constant. On the contrary, when the raw material supply amount is drastically reduced, it is possible to make the ratio of the raw material falling from between the rolls constant by increasing the rotation speed of the rolls. These controls are
It can be carried out without stopping the operation of the sintering machine.

An example in which the present invention and the prior art raw material charging method are compared is shown in FIGS. 9 and 10. Fig. 9 compares the average particle size of the pseudo particles in the height direction of the raw material packed bed due to the difference in the raw material charging method. The symbol □ indicates charging using a sloping plate, and the symbol ◇ indicates Japanese Unexamined Patent Publication No. 5-1335. Charge using a screen-shaped chute made of the proposed rod (Fig. 15
In the above), the mark ● indicates charging using the roller feeder of the present invention. As shown in FIG. 9, charging using the roller feeder of the present invention can greatly change the average particle size (particle size segregation) in the height direction of the raw material packed bed.

FIG. 10 is a comparison of the raw material feed rate and the grain size segregation degree due to the difference in the raw material charging method. The symbol ⋄ indicates charging using a sloping plate, and the symbol Δ indicates Japanese Patent Publication No. 6-27291.
Charging via slanted bar as proposed in
In the above), the mark ● indicates charging using the roller feeder of the present invention. The data marked with △ is CAMP-ISIJ Vol.1 (19
88) -1054 (Materials and Processes).
As shown in FIG. 10, it is understood that the charging using the roller feeder of the present invention has a high controllability of the particle size segregation degree regardless of the raw material supply rate. The particle size segregation degree is a value obtained by dividing the difference between the average particle size of the lowermost layer and the average particle size of the uppermost layer by the average particle size of the entire layer.

[0045]

Example 4 An example of a sintering machine raw material charging device is shown in FIGS. A drum feeder 2 is installed below the ore feeding hopper 1 as a feeder, and a chute 3 for receiving raw materials falling from a reflector plate of the drum feeder 2 is arranged in a state of being connected to an upper end of a roller feeder 4.

The roll of the roller feeder 4 is a long cylindrical roll 7, which has support shafts at both ends and is supported by bearings 9a and 9b of the pedestal 16. The roll 7 is usually made of steel and has a wear resistance elastic material such as rubber or urethane, or stainless steel is used because it has no adhesion of raw materials and requires wear resistance.

One side of the support shaft 8 is extended to serve as a drive shaft 10 for rotating the rolls, and each roll is driven by a motor with a speed reducer (not shown).
Alternatively, it is possible to arbitrarily select whether all the drive shafts of the roll are chained and driven by one variable speed motor 14 with a speed reducer. The drive by the chain 12 is performed by connecting the chain wheel 13 of the output of the reduction gear and the driven side chain wheel 11.

The row of rolls consisted of seven rolls, the width of which was almost the same as the width of the sinter, the rows of rolls were perpendicular to the length of the sinter and parallel to each other, and the interval 18 between the rolls. The structure is such that the roll main body and the roll bearings are slidably fixed on the pedestal so that it is possible to arbitrarily select whether the intervals 18 are the same or different depending on places, although the same over the entire column length.

The inclination angle of the roller feeder 4 is changed by extending the support beams 17 at both ends of the pedestal 16 and providing an electric jack 19 between the support beams 17 and the beam on which the feed hopper is placed.
This is done by expanding and contracting. It is possible to use a hydraulic cylinder or a pneumatic cylinder instead of the electric jack 19. The direction of the inclination angle of the roller feeder 4 is opposite to the traveling direction of the sintering machine pallet 5 (arrow A).

An example of the charging device is as follows. Roller feeder width: 4300mm Roll diameter: 115mm Roll gap: 10-40mm Number of rolls: 7 Roll drive motor: 5.5kW Shooting angle: 20-50 ° Electric jack: 500kg, 800mm Stroke drum feeder diameter: 1300mm

Explaining the operation of charging the sintering raw material into the sintering machine, the sintering raw material M in the feed hopper 1 is cut out by the drum feeder 2 which has almost the same width as the sintering machine, and is removed from the drum by the reflector plate. It separates and falls naturally, and is once received by the chute 3 and supplied to the upper end of the roller feeder 4. The operating specifications (tilt angle, roll rotation number, roll interval) of the roller feeder 4 are set according to the properties of the sintering raw material (particle size distribution, mixing brand, mixing ratio, etc.), and the sintering raw material M is partially It passes through the gap of the roll 7, and the rest is charged into the sintering machine from the final roll.

At this time, the inclination of the roll row is opposite to the traveling direction of the pallet 5 of the sintering machine, and as shown in the figure, a slope is formed which is opposite to the traveling direction. The raw material M supplied by dropping and rolling from the roller feeder 4 is accumulated on this slope, but since the pallet is moving, the shape of this slope is similar. Further, the raw material that has fallen from the roll gap is also deposited on this slope to segregate the grain size to form the packing layer 6 on the pallet. In the packed bed thus formed, a predetermined grain size segregation and a raw material charge density are obtained in the vertical direction, the avalanche phenomenon is suppressed, and a stable sintering operation becomes possible.

[0053]

As is apparent from the above description,
ADVANTAGE OF THE INVENTION According to this invention, when charging a sintering raw material on a sinter pallet, the target particle size segregation and charging density can be obtained, and the avalanche phenomenon can be suppressed more effectively. . In addition, since the operating elements of the roller feeder of the raw material charging device can be easily and easily adjusted, stable sintering operation can be performed according to the raw material conditions, and the productivity, yield, and yield of the sintering machine can be improved. It can be expected to improve quality.

[Brief description of drawings]

FIG. 1 is a diagram showing the relationship between the degree of segregation and the average particle size of each part of the packed bed in Example 1.

FIG. 2 is a view showing a raw material particle size distribution in a vertical direction of a packed bed of Example 2.

FIG. 3 is a diagram showing the slope of the average particle size distribution curve for each charging mode of Example 2.

FIG. 4 is a view showing a raw material charging density distribution in a vertical direction of a packed bed of Example 2.

FIG. 5 is a diagram showing the frequency of occurrence of an avalanche phenomenon for each charging mode according to the second embodiment.

FIG. 6 is a conceptual diagram illustrating a roll interval according to the embodiment.

FIG. 7 is a view showing the influence of a chute angle and a roll speed on the raw material dispersion of Example 3, where (a) is the chute angle.
40 ° and (b) show the results when the shoot angle was 50 °.

FIG. 8 is a diagram showing a relationship between a roller feeder and a sampling box of Example 3, where (a) shows a chute angle of 40.
°, (b) has a shoot angle of 50 °.

FIG. 9 is a view comparing the pseudo particle average particle diameters in the height direction of the raw material packed bed according to the difference in the raw material charging method.

FIG. 10 is a diagram comparing a raw material supply rate and a particle size segregation degree according to a difference in a raw material charging method.

FIG. 11 is a side sectional view of an example of a sintering machine ore feeder.

FIG. 12 is a plan view of a roller feeder that is an example.

FIG. 13 is a diagram showing a relationship between sintering time of a sintering machine and particle size segregation.

FIG. 14 is a conventional ore feeder.

FIG. 15 is a conventional ore feeder.

FIG. 16 is a conventional ore feeder.

[Explanation of symbols]

1 ... Mining hopper, 2 ... Drum feeder, 3 ... Chute, 4 ... Roller feeder, 5 ... Pallet, 6 ... Packing layer, 7 ... Roller, 8 ... Support shaft, 9a, 9b ... Bearing, 10 ...
Drive shaft, 11 ... Driven side chain wheel, 12 ... Chain, 13 ... Chain wheel, 14 ... Drive motor with variable speed reducer, 15 ... Structure fixed by sliding, 16 ... Stand, 17 ... Support beam, 18 … Interval, 19… electric jack, 21… hopper, 22…
Drum feeder, 23 ... Shute, 24 ... Pallet, 25 ... Great bar, 26 ... Rotary roll, 27 ... Belt type feeder,
28 ... Rod, 29 ... Guiding chute, 30 ... Bar material, 31 ... Bar material upper mounting plate, 32 ... Bar material lower mounting plate, 33 ... Sloping plate, 34 ... Wind box, 35 ... Sampling box, M ... Sintering material.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Shinji Amano             1 Kanazawa Town, Kakogawa City, Hyogo Prefecture             To Steel Works, Kakogawa Works (72) Inventor Akihiro Nishiguchi             1 Kanazawa Town, Kakogawa City, Hyogo Prefecture             To Steel Works, Kakogawa Works (72) Inventor Nobuo Mizoue             1 Kanazawa Town, Kakogawa City, Hyogo Prefecture             To Steel Works, Kakogawa Works (72) Inventor Yukio Kakitsubo             1 Kanazawa Town, Kakogawa City, Hyogo Prefecture             To Steel Works, Kakogawa Works (72) Inventor Ryoji Ito             1 Kanazawa Town, Kakogawa City, Hyogo Prefecture             To Steel Works, Kakogawa Works (72) Inventor Koji Ano             1 Kanazawa Town, Kakogawa City, Hyogo Prefecture             To Steel Works, Kakogawa Works

Claims (6)

[Claims] 1. In a method of charging a sintering raw material from a feeder under a feed hopper of a sintering machine onto a sinter machine pallet via a roller feeder, the inclination angle of the roller feeder and the rotation number of each roll are set. A raw material charging method for a sintering machine, which is arbitrarily adjusted to obtain a target grain size segregation of a sintering raw material packed bed on a pallet. 2. In a method of charging a sintering raw material from a feeder under a feed hopper of a sintering machine onto a sinter machine pallet via a roller feeder, the roll interval of the roller feeder is set to the upstream side and the downstream side of the roller feeder. The raw material charging method of the sintering machine, which is changed on the side to control the particle size segregation and the density distribution of the sintering raw material packed bed on the pallet. 3. In a method of charging a sintering raw material from a feeder under a feed hopper of a sintering machine onto a sintering machine pallet via a roller feeder, the roll spacing of the roller feeder is set to the upstream side and the downstream side of the roller feeder. The method of charging the raw material of the sintering machine, which is changed on the side to suppress the collapse of the sintering raw material packed bed on the pallet. 4. In a method of charging a sintering raw material from a feeder under a feed hopper of a sintering machine onto a pallet of a sintering machine via a roller feeder, the roll interval of the roller feeder is set to the upstream side of the roller feeder. Is set to be narrower than the downstream side, and the raw material charging method of the sintering machine is controlled to control the particle size segregation and the density distribution of the sintering raw material packed bed on the pallet. 5. In a method of charging a sintering raw material from a feeder under a feed hopper of a sintering machine onto a pallet of a sintering machine through a roller feeder, the roll interval of the roller feeder is set to the upstream side of the roller feeder. Is set to be narrower than that on the downstream side to suppress the collapse of the sintering raw material packed bed on the pallet. 6. A supply mechanism is installed below the mining hopper,
A roller roll chute having an upper end connected to the supply mechanism and a lower end arranged on a sinter machine pallet, which comprises a plurality of rolls, each of which is provided so as to be changeable at a predetermined interval, and both ends thereof. Of a sintering machine provided with a support pedestal on which a bearing for bearing is mounted, an inclination changing means provided on the support pedestal, and a drive means provided on the roll and capable of varying the rotation speed. Raw material charging device.