JP2792884B2 - A method for promoting the segregation of loose particles on a belt conveyor. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention promotes particle size segregation of bulk materials on a belt conveyor, which promotes the action of bulk materials segregated on a belt conveyor during transportation. It is about the method.

<Conventional technology> Sinter ore and coke used in a blast furnace are generally crushed and sized by a crusher or a screen, but the particle size range is large, for example, 3 to 75 mm for sinter. In the blast furnace on the side of use, the smaller the particle size range is desirable, the smaller the particle size range. As a method of reducing the particle size range, the above-mentioned conventional sintered ore or coke is classified into two groups, large and small, and each is individually loaded into the blast furnace. Grain size charging methods are known.

As a classification method, a method using a normal screen can be considered.
As shown in the figure, a classifying damper 2 is disposed upwardly below the vicinity of a head portion of a belt conveyor 1 for transporting bulk materials 3,
It is effective to classify the bulk material 3 falling from the head portion discharge end of the belt conveyor 1 into bulk materials 3a and 3b by the classifying damper 2.

Classification in this way is based on the fact that the bulk material 3 segregates on the belt conveyor 1 in particle size.
As shown in the figure, the bulk material 3 is composed of upper large particles and lower small particles because small particles pass through the large particle gap and accumulate downward during transportation. When this is divided by the classifying damper 2, the transported goods 3a on the right side of the classified damper 2 are large particles and the transported goods 3b on the left side.
This is because classification is performed as small particles.

<Problems to be Solved by the Invention> However, individual shapes of bulk materials such as sinter and coke are complicated and different. For this reason, the bulk material 3 on the belt is not actually segregated from the upper surface to the lower surface as shown in FIG. As a result, even if the bulk material 3 is divided by the classifying damper 2, efficient classification cannot be performed.

The present invention solves the above-mentioned problems of the prior art, and improves the performance of classifying coarse and fine particles of bulk materials by a classifying damper disposed below the head portion of the belt conveyor. The purpose is to promote the particle size segregation of the goods transported.

<Means for Solving the Problems> In the belt conveyor head, when bulk materials such as sinter and coke are classified by a classifying damper, in order to improve the classifying performance, segregation on the belt conveyor is further promoted. There is a need to. Accordingly, the present inventor has conducted intensive studies and investigations on the method of promoting segregation. As a result, the present inventors have found that it is sufficient to apply an impact or an external force to the transported bulk material as described below, and have completed the present invention.

(1) To change the carrier roller trough angle of a part of the conveyor; (2) To change the belt profile by raising the height of the carrier roller; and (3) To apply vibration to the carrier roller stand.

According to a first invention of the present invention based on the above-mentioned knowledge, the method for promoting segregation of bulk materials on a belt conveyor includes a method for classifying bulk materials by a classifying damper disposed below a head of a belt conveyor for transporting bulk materials. (1) changing the trough angle of a part of the plurality of carrier rollers arranged in the longitudinal direction of the belt conveyor; and (2) changing the trough angle of the carrier rollers arranged in the longitudinal direction of the belt conveyor. At least one means or combination of raising the height of some of the carrier rollers to change the height of the belt profile in the longitudinal direction promotes the particle size segregation of the bulk material on the belt conveyor, and improves the classification performance of the bulk material by the classifying damper. The method of promoting the segregation of loose particles on a belt conveyor characterized by That.

2. The method according to claim 1, wherein the carrier stand supporting the carrier roller is vibrated. 4. The method of claim 1, wherein the carrier stand supports the carrier roller.

Hereinafter, the configuration and operation of the present invention will be described with reference to the drawings. FIG. 1 shows a case in which the trough angle of the carrier rollers 4 on both sides of the three carrier rollers 4 in the width direction is changed for a part of the plurality of carrier rollers 4 arranged in the length direction of the belt conveyor. 2 shows the state of the bulk material 3 loaded on the belt conveyor 1 of FIG.

As shown in FIG. 1 (a), when the normal trough angle is set, small particles 3 remain on the upper surface layer of the bulk material 3;
As shown in FIG. 1B, when the trough angle of the carrier rollers 4 on both sides is increased and an external force is applied to the bulk material 3, small-sized particles permeate into the lower layer, and as shown in FIG. 1C. Particle size segregation of the loose pieces 3 becomes remarkable. Although the trough angle is increased in FIG. 1, the same effect can be obtained when the trough angle is reduced and an external force is applied to the bulk 3.

FIG. 2 shows that a plurality (three in the drawing) of the plurality of carrier rollers 4 arranged in the length direction of the belt conveyor are raised to change the profile of the belt conveyor 1 in the length direction. Loose things 3
Shows the situation. FIG. 2 is a cross-sectional view corresponding to the view AA of FIG. In this case, the belt conveyor 1
Since the bulk material 3 is shaken at the portion of the upward slope, small particles having a small particle size are gathered downward by the permeation action, and the particle size segregation is promoted. FIG. 3 shows a carrier stand 5 supporting a carrier roller 4 having a vibrator 6 such as a vibrator attached thereto. Since the loose objects 3 on the belt conveyor 1 are vibrated by the vibrator 6, the loose objects 3 Particle size segregation is promoted.

If the above three means are applied independently, it is possible to promote the particle size segregation of the bulk material. However, if two means are combined, or if all three means are applied, the particle size segregation effect becomes large. Thus, the classification performance by the classification damper is improved.

<Example> In the present invention, a means for changing a trough angle of a carrier roller was applied, and a sintered ore was classified by a classification damper. FIG. 4 (a) shows the classification performance when there is no change in the trough angle, and FIG. 4 (b) shows the case where there is a change. 4 (a) and 4 (b) are bar graphs showing the particle size distribution of the sintered ore divided into two parts by the classifying damper by weight, the white bar graph shows the particle size distribution of the upper layer side on the belt conveyor, and the hatched bar graph shows the belt conveyor. The upper particle size distribution of the lower layer is shown.

4 (a) and 4 (b), it was confirmed that changing the trough angle of the carrier roller and applying an external force to the bulk material can greatly contribute to the improvement of the classification performance. The various conditions of this example are as follows.

Belt speed 120m / min Belt width 1050mm Transport amount 900t / h Divided weight ratio 70 (large particle size): 30 (small particle size) Also tested by other means, the same effect as this example can be obtained. did it.

<Effects of the Invention> As described above, according to the present invention, since the bulk material loaded on the belt conveyor can promote the action of segregating the particle size during the transportation, the bulk material is disposed below the vicinity of the head of the belt conveyor. The classification performance of the classified damper is improved.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a mode of changing the trough angle of the carrier roller of the first invention of the present invention, FIG. 2 is an explanatory view showing an aspect of raising the carrier roller of the first invention of the present invention, and FIG. FIG. 4 is an explanatory view showing a mode of attaching the vibrator of the second invention of the present invention, FIG. 4 is a bar graph showing the particle size distribution of the sintered ore, FIG. 5 is an explanatory view showing a classification state by a general classification damper, and FIG. The figure is an explanatory view showing the state of segregation of bulk materials on a conventional belt. 1 ... belt conveyor, 2 ... classifying damper, 3 ... bulk material, 4 ... carrier roller, 5 ... carrier stand, 6 ... vibrator.

Claims (2)

(57) [Claims] When a bulk material is classified by a classifying damper provided below a head of a belt conveyor for transporting the bulk material, (1) a large number of carrier rollers provided in a longitudinal direction of the belt conveyor. Changing the trough angle of a part of the carrier rollers, (2) changing the height of the part of the carrier rollers arranged in the longitudinal direction of the belt conveyor to a longitudinal belt profile by raising the height of the carrier rollers. A method for promoting particle size segregation of bulk materials on a belt conveyor, which promotes the particle size segregation of bulk materials on a belt conveyor by at least one means or combination thereof, and improves the classification performance of the bulk materials by a classifying damper. 2. The method for promoting segregation of loose particles on a belt conveyor according to claim 1, wherein vibration is applied to a carrier stand that supports the carrier roller.