JPH0321230B2 - - Google Patents

Description

[Detailed description of the invention]

(Field of Industrial Application) The present invention relates to a sieving device that is effective in sieving powder and granule materials, particularly wet powder and granule materials, in the field of processing powder and granule materials. (Prior Art) As an industrial sieve device, a mesh sieve or a sieve device consisting of a plurality of substantially parallel rods are generally used. When the former is a mesh sieve, a metal mesh is most widely used, and a typical sieve uses a vibration device to vibrate the sieve to separate the top and bottom of the sieve.
It has a structure in which it is divided into stages of granularity. Therefore, when sieving particles into three or more levels of particle size, sieving is performed using a plurality of sieving devices each having a vibration device. However, mesh sieve equipment is prone to clogging when separating powder and granular materials, especially wet powder, and the sieve structure becomes complicated when separating powder into multiple stages, making it difficult to work with and maintain. There is a problem of cost increase due to the use of a plurality of sieves or a plurality of sieves. In the case of the latter, a sieve made of almost parallel bars, for example, in Japanese Patent Publication No. 43-27379, two adjacent bars of a plurality of parallel strips are made almost horizontal only at their attached ends. In this state, the strip is gently tilted to the extent that an object resting on the strip does not slide on the strip due to the action of gravity alone, and the tip of the strip is set as a free end. A sieve device has been proposed in which a sieve surface is formed by arranging adjacent strips at different angles toward the object, and the sieve surface is vibrated by a vibrator to cause the object to be sieved to roll and fall. There is. Furthermore, in the above-mentioned patent publication, in order to further improve the separation accuracy of objects to be sieved, multiple sets of strips are arranged in the vertical direction, each sieve surface is vibrated by a vibration device, and the strips roll on the strips. The upper part of the sieve is discharged from the transfer end of the sieve, and the lower part of the sieve which has fallen through the gap between the strips is separated, and the lower part of the upper sieve is further subjected to the sieving action one or more times. There is. Furthermore, in JP-A No. 56-155676, two adjacent strips of a plurality of strips arranged in parallel are made substantially horizontal only at their attached ends, and the tips of the strips are horizontal or slightly downward from the horizontal. A sieve surface is formed by arranging adjacent strips at different angles, and a plurality of strips are arranged in series so that the sieve surface is vibrated by a vibration device and the object to be sieved rolls and falls. A sieving device configured as follows has been proposed. However, since these sieving devices made of rods and strips have adjacent strips arranged almost horizontally at the strip attachment part, it is difficult to separate powder or granular materials, especially wet powder or granules, through the sieve, or when separating the strips. Fine powder or sticky wet powder particles are very likely to clog near the mounting area. In addition, in order to improve the sieve separation efficiency, it is necessary to enlarge the sieve surface, but as mentioned above, the sieve surface is small near the strip attachment part where the strips are arranged horizontally because the spacing between the strips is small. When a large amount of fine powder or sticky wet powder is supplied, they tend to accumulate in layers, resulting in a significant drop in sieving efficiency. Furthermore, in order to cause the object to be sieved to roll and fall from the gap between the strips, a vibrating device is required if the angle at which the bars and strips are attached to a horizontal surface is small. In order to further improve the sieve efficiency, there has been a problem in that it is necessary to consecutively arrange a plurality of sieve devices in multiple stages, each of which has a vibrating device for each sieve surface. (Problems to be Solved by the Invention) An object of the present invention is to solve the problems of the prior art described above, and to develop a sieve that can achieve any sieving step to any particle size with a simple device without the need for a vibration device. The purpose is to provide equipment. A further object is to provide a sieving device that can efficiently sieve wet powder and granular materials. (Means and effects for solving the problem) The gist of the present invention is to arrange the strips at intervals and tilting in the same direction, and the spacing between the strips becomes smaller as the position goes lower. In a sieve device that is arranged so that it becomes wider, the strips are separated by two in the height direction.
The strips of each strip group are divided into three or more groups, and the shape connecting the sieve surfaces of the strips forms peaks and valleys when viewed from the longitudinal cross-sectional direction on both the high and low sides. This sieving device is characterized in that each group of strips is arranged such that the peak of the group of strips in the lower row is located near the valley of the adjacent group of strips in the upper row. In addition, the ridge surface connecting the sieving surfaces of the strips forming the peaks and valleys of each strip group is formed by three or more strips, and only the high position side of the strip group is fixed with a fixing plate, and the low It is preferable that the position side is a free end, and that the valleys of the upper row of strips and the peaks of the lower row of strips are made of the same strip. According to the present invention, the strips are arranged so that the shapes connecting the sieves of the strips of each strip group form peaks and valleys, and each strip group is arranged so that the ridges of the lower row group are One feature is that the strips are arranged so as to be located near the valleys of the adjacent upper row group of strips.
To explain more specifically the positional relationship between the peaks and valleys between the upper and lower rows of strip groups, the uppermost strip forming the top of the mountain of the lower row of strips is From the middle to the strip 31 between the lowest strip 31 forming the valley of the row of strips and the top strip 32 forming the peak of the upper row of strips, and below it;
That is, it is placed within the area shown by diagonal lines in FIG. Four typical arrangement examples will be described, taking as an example a case where three steps in the upper row and four steps in the lower row are provided on both the high position side and the low position side of the strip group. Below, in each group of strips, when the ridge surface that connects the sieve surfaces of the strips that form the peaks and valleys is formed by three strips, the arrangement of the strips is shown as three steps and four strips. The case where a ridge surface is formed is called a four-step difference, and when the arrangement of the strips arranged at an angle is shown in a side view,
This refers to an arrangement that looks like three or four strips. (1) As shown in FIG. 1A, when the above-mentioned strip 41 of the four lower rows is arranged directly below the lowermost strip 31 of the three upper rows. (2) As shown in FIG. 1B, when the uppermost strip 41 of the four lower rows is arranged so as to be in contact with the lowermost strip 31 of the three upper rows. (3) As shown in FIG. When placed directly below the middle position of the upper strip 32. (4) As shown in FIG. (also serves as the bottom row of the upper row of valleys). With this device configuration, when powder and granules are fed from the high position side of the top row of strips arranged at an angle, the finer the particles are The coarser the particles, the faster they fall from between the strips, the more they roll on or between the strips, and the more they disperse, the more they move to the lower position, and the more they fall toward the valley formed by the sieve surface of the strips mentioned above. However, the powder and granules that fall near this valley fall to the top of the mountain formed by the sieve surface of the group of strips below it, or near the top of the mountain, and subsequently, as in the case of the group of strips in the upper row mentioned above, Similarly, it rolls toward the valley, so
The number of times the powder and granules roll increases, resulting in a sieve surface made of strips with only one row of peaks and valleys, or two or more rows of peaks and valleys, but with peaks and valleys formed indiscriminately. The dispersion effect of the object to be sieved becomes much larger than that of the sieve surface, and the sieve efficiency improves. The operation will be further explained below with reference to FIG. If the sieve surface is made of strip material with only one row of peaks and valleys, the object to be sieved will not roll and fall uniformly over the entire surface of the sieve, as shown in Figure 112A, and will fall in the valleys. As the powder is concentrated in the area, the amount of powder and granules supplied to each strip becomes unbalanced.
Since the sieve surface of the mountain part is not used effectively,
The effect of improving sieve efficiency is small. In addition, two or more rows of peaks and valleys are formed, but if the sieve surface has peaks and valleys arranged indiscriminately, the bottom row of valleys is formed directly below or near the upper row of valleys, or the upper row of valleys is A lower row of peaks may be formed directly below or in the vicinity of the peak. In this case, the rolling and falling condition of the object to be sieved is the same as in case A on the sieve surface of the upper row, and the object to be sieved concentrated in the valley of the upper row continues to fall further into the valley of the sieve of the lower row. Concentrate on that part and fall. In such a sieve configuration, even if the number of sieve surfaces is increased, the amount of powder and granular material supplied to each strip in each row becomes unbalanced, and the sieve surfaces in the peaks of each row are not used effectively. The effect of improving sieve efficiency is small. On the other hand, when the present invention has multiple sieve surfaces, the first
As shown in Figure 2B, the sieving drawings in the upper row are the same as those in the same case, but the objects to be sieved that are concentrated in the valleys in the upper row are mainly concentrated in the mountain regions in the lower row. Since the object falls and rolls while being dispersed along the sieve surface toward the valley, the object to be sieved that has passed through the sieves in the lower row is uniformly dispersed over the entire surface of the sieve. Therefore, the sieve surface is used effectively and the sieve efficiency is improved. Furthermore, the basic function of a sieve is that the horizontal and vertical intervals of each strip in the upper row group and the lower row group when viewed from the longitudinal direction are within the following ranges on both the high and low side. preferred. a ₁ (horizontal spacing of upper row material group)≧a ₂ (horizontal spacing of lower row material group) b ₁ (horizontal spacing of upper row material group)≧b ₂ (vertical spacing of lower row material group) In the present invention, When the strips are arranged so that the peaks of the lower row of strips are close to the valleys of the adjacent upper row of strips, the distance between the upper and lower rows of strips makes the device more compact. , the distance between the lowest row of strips forming the valley in the upper row of strips and the top row of the lower row of strips is within 100 cm, preferably
It is best to keep it within 50cm, most preferably within 30cm. Furthermore, in the present invention, the shape connecting the sieve surfaces of the strips forms peaks and valleys on both the high position side and the low position side of the strips of each strip group, so that the sieve surface especially on the high position side By forming peaks and valleys, an inclination is formed between adjacent strips even near the fixing part of the strips on the high position side, so the sieving surface expands and the object to be sieved is separated from the upper strips. Since it slides smoothly onto the adjacent lower row of strips, even when separating fine powder or sticky wet powder through a sieve, there will be no clogging due to adhesion between the strips near the strip fixing part. . In addition, as mentioned above, the sieve surface expands near the strip fixing part on the high position side of the strips in each strip group, so even when the amount of material to be sieved is large, it is possible to Since rolling and sliding movements of the sifted object in the horizontal and vertical directions are taken into account on all sieve surfaces on the strip elements up to the position side, the sifted object moves between the strips of each strip group. The sieving efficiency is improved because the dispersion and spreading motion is much greater. In order to significantly improve sieving efficiency, it is necessary to use strips that form peaks and valleys on both the high and low sides of each strip group in two or more rows of strips. It is desirable that the ridge surface connecting the sieve surfaces of the sieve is formed of three or more strips, and that only the high position side is fixed with a fixing plate, and the low position side is a free end. By providing three or more steps in this way, the sieve surface made up of all the strips not only near the high-position side strip attachment part but also all the way to the low-position side expands by the amount of the step. Even when a large amount of sieved objects are fed, the objects to be sifted are forced to move between the strips because the objects to be sifted are subject to additional rolling, sliding, and falling movements in the horizontal and vertical directions on all sieving surfaces. dispersed, and the sieving efficiency is significantly improved. In addition, in a group of two or more rows of strips, only the high position of each strip is fixed with a fixing plate, and the lower position side is the free end, so that the impact when the object to be sieved falls onto the strip is reduced. As a result, vibrations according to the slight elastic strain of the strip and the natural frequency of the strip occur randomly in each strip, and even without a forced vibration device, vibration effects between adjacent strips can be generated. is demonstrated.
In order to make it easier for the object to be sifted to roll and fall from the high position side to the low position side as a result of this vibration,
It is preferable to adjust the inclination angle according to the substance to be sieved, such as increasing the inclination angle particularly in the case of sticky objects. It is necessary to incline the strip to such an extent that the object that falls onto the strip begins to slide on the strip due to the effect of the impact energy at the time of the fall and the gravity of the object to be sifted. This inclination angle is preferably 15° or more from the high position side to the low position side. Note that the number of steps between the upper row and the lower row is not limited to the above example, and the number of steps between the upper row, the lower row, etc.
Set an arbitrary number of steps for both the bottom rows, and use the above 2 steps.
The four arrangements in the column example are combined as appropriate. In addition, by increasing the number of steps between the strips in each row, the sieving surface increases and the sieve efficiency improves, so the number of steps between the strips in each row is 3.
Levels above are desirable. In addition, in the case of providing three or more rows of strip groups in the present invention, as in the case of the two-row arrangement described above,
The second
As shown in the figure and Figures 1A to 1D, the peaks of the lower row of strips may be located near the valleys of the upper row of strips. The arrangement of the peaks and valleys between the first and second rows and the arrangement of the peaks and valleys between the second and third rows may be exactly the same, or they may be shown as slopes in Figure 2. Within the range, the position of the peak of the lower row of strips may be changed as appropriate between the first and second rows and between the second and third rows of the strips. Further, the number of steps in the strip groups may be the same for each strip group, or may be changed for each strip group. (Examples) Hereinafter, the present invention will be described in detail based on Examples. Example 1 An example in which limestone powder particles having a particle size of 10 mm or less and a moisture content of 6.2% by weight were separated using a sieve will be explained based on FIGS. 3 and 4. In Fig. 3, granular limestone 8 supplied to a hopper 1 is cut out by a belt feeder 3, falls into a chute 4, is sent to a sieving device, and is separated through a sieve while rolling through a strip 6. It was done. In this example, round steel with a diameter of 8 mm was used as the strip material. Figure 4 shows the strip fixing parts 5 and 7 shown in Figure 3.
In this example, the strips 6 are provided with four steps in the upper row and five steps in the lower row, and the top row of the bottom row is the same as the bottom row of the top row. They were arranged using the same strip material. The average inclination angle with respect to the horizontal direction was 18°. In FIG. 4, the horizontal interval a ₁ between the upper row of strips at the higher-position strip fixing portion is 4.6 mm.
Therefore, if there is no step in the upper row of strips,
Particles larger than 4.6 mm cannot be separated using a sieve, but the vertical spacing b ₁ of the strip fixing part on the high side is stepped at intervals of 3.0, and the horizontal spacing a ₁ of the strip fixing part on the low side is 4.6. mm, and vertical spacing b ₁ to 15.0mm
Since there is a step difference in interval, limestone particles larger than 4.6 mm are separated through the sieve while rolling and falling through the upper row of strips, and subsequently fall onto the lower row of strips. The horizontal spacing a ₂ of the lower row of strips at the high position side strip fixing part is 1.5 mm, and the vertical spacing b ₂
Steps are provided at 3.0 mm intervals, and the horizontal distance a ₂ is 1.5 mm at the lower strip fixing part, and the vertical distance b ₂ is 15.0 mm apart.
The limestone is separated through a sieve while rolling and falling through the lower row of strips. That is, finer particles fall faster, and coarser particles roll and fall on the strip material and fall slower. In this embodiment, a collection hopper 1 is placed below the strip.
4 and 15 were provided to collect the fallen limestone after sieving and convey it to a predetermined location by belt conveyors 16 and 17. Example 2 An example in which coke powder having a particle size of 10 mm or less and a moisture content of 4.5% by weight was separated by sieving will be explained based on FIGS. 5 and 6. In FIG. 5, the powdered coke 9 supplied to the hopper 1 is transferred to the belt feeder 3
After falling into a chute 4, it was sent to a sieving device and separated through a sieve via a strip 6 while rolling. In this example, the diameter of the strip is 10 mm.
round steel was used. FIG. 6 is a diagram showing the arrangement of the strip 6 at the fixed part 5 and free end of the strip shown in FIG.
In this embodiment, the strips 6 are provided with three steps in the upper row and three steps in the lower row so that the top step forming the peaks in the lower row is near the bottom step forming the valleys in the upper row. Arranged in Average inclination angle to horizontal direction is 30°
And so. In Figure 5, the horizontal spacing a ₁ of the upper row of strips at the high position side strip fixing part is 1.0 mm, and the vertical spacing b ₁ has a step of 3.0 mm, and the strips on the low side are free. At the ends the horizontal spacing a ₁ is 1.0 mm,
In addition, steps were provided at 15.0 mm intervals at the vertical interval _b1 . The coke particles are separated through a sieve while rolling and falling through the upper row of strips, and subsequently fall onto the lower row of strips. The horizontal spacing a ₂ of the lower row of strips at the high position side strip fixing part is 1.0 mm, and the vertical spacing b ₂
Because steps are provided at 2.0 mm intervals, the horizontal distance a ₂ at the free end of the strip on the low position side is 1.0 mm, and the vertical distance b ₂ is provided with steps at 15.0 mm intervals.
The coke is separated through a sieve while rolling and falling through the lower row of strips. In this embodiment, a collection hopper 1 is placed below the strip.
8 and 19 were provided to collect the fallen coke after sieving and convey it to a predetermined location by belt conveyors 20 and 21. Example 3 An example in which iron ore powder having a grain size of 15 mm or less and a moisture content of 5.6% by weight was separated by sieving will be described with reference to FIGS. 7 and 8. In FIG. 7, iron ore powder 10 supplied to a hopper 1 is cut out by a belt feeder 3, falls into a chute 4, is sent to a sieving device, and is separated by a sieve through a rolling strip 6. Ta. In this example, round steel with a diameter of 8 mm was used as the strip material. FIG. 8 is a diagram showing the fixing status of the strips 6 in the strip fixing part 5 on the high side shown in FIG. 7 and the arrangement of the strips in the strip fixing part 7 on the low side shown in FIG. , the strip material 6 has 3 steps in the upper row and 4 steps in the lower row.
A difference in level was provided so that the uppermost level forming the mountain in the lower row was arranged almost directly below the strip material in the second level of the upper row. The average inclination angle with respect to the horizontal direction was set to 40°. In Figure 8, the horizontal spacing a ₁ of the upper row of strips at the high-position side strip fixing part is 7.0 mm, and the vertical spacing b ₁ is 2.0 mm apart, and the strips on the low-position side are fixed. The horizontal spacing a ₁ is 7.0 mm at
In addition, steps at 20.0 mm intervals were provided at the vertical interval _b1 . The iron ore particles are separated through a sieve while rolling and falling through the upper row of strips, and subsequently fall onto the lower row of strips. The horizontal spacing a ₂ of the lower row of strips at the high position side strip fixing part is 2.0 mm, and the vertical spacing b ₂
Steps are provided at 1.5 mm intervals, horizontal distance a ₂ is 2.0 mm at the lower strip fixing part, and vertical distance b ₂ is provided with steps at 20.0 mm intervals.
The iron ore is separated through a sieve while rolling and falling through the lower row of strips. In this embodiment, the collecting hopper 2 is placed below the strip material.
3 and 24 were provided to collect the fallen iron ore after sieving and convey it to a predetermined location by belt conveyors 25 and 26. Example 4 In this example, iron ore powder with a grain size of 15 mm or less and a moisture content of 4.3% by weight was sieved using a sieve device consisting of three rows of strips, based on Figs. 9 to 11. explain. In this example, as a comparative example in addition to the inventive example, iron ore powder was sieved using a sieve device with three groups of strips in which peaks and valleys were arranged indiscriminately. FIG. 9 is a schematic side view showing the sieving device of this example, and in the same figure, the arrangement of the strips seen from the side of the example of the present invention and the comparative example are completely the same. In FIG. 9, iron ore powder 11 supplied to the hopper 1
is cut out by belt feeder 3, and chute 4
After falling to the ground, it was sent to a sieving device, where it was separated through a sieve through a strip 6 while rolling. A round steel strip with a diameter of 8 mm was used. 10 shows the fixing status of the strips 6 of the three rows of strips in the strip fixing section 5 on the high position side and the arrangement of the free ends of the strips on the low side in the example of the present invention shown in FIG. 9. It is a diagram. In the example of the present invention, the top row of strips 6 is provided with three steps, the second row is provided with three steps, and the bottom row is provided with four steps, so that the top row of strips forming the second row of peaks is formed. are arranged so that they are near the bottom row of strips that form the top row of valleys, and the top row of strips that form the bottom row of peaks is directly below the bottom row of strips that form the second row of valleys. I arranged it so that it comes to . The average inclination angle with respect to the horizontal direction was 35°. In Fig. 10, the horizontal spacing a ₁ of the top row of strips at the strip fixing part on the high position side is 5.5 mm;
And a step with a 3.0 mm interval is provided in the vertical interval b ₁ ,
Horizontal spacing at the free end of the strip on the low position side a ₁
was 5.5 mm, and steps were provided at 30.0 mm intervals at the vertical interval _b1 . The iron ore powder particles are separated through a sieve while rolling and falling through the top row of strips, and subsequently fall onto the second row of strips. In Fig. 10, the horizontal spacing a ₂ of the strips in the second row is the same as the horizontal spacing a ₁ of the strips in the top row, but the vertical spacing is reduced, and the vertical spacing on the high position side is b ₁ to 1.0mm, vertical spacing on the low position side
Steps with a spacing of 25.0 mm were provided on b ₂ . The iron ore powder particles roll down through the strips, are separated by a sieve, and then fall onto the bottom row of strips. In Figure 10, the horizontal spacing a ₃ of the lowest row of strips at the high-position strip fixing part is 1.0 mm;
And a step with a 2.0 mm interval is provided at the vertical interval b ₃ ,
Horizontal spacing at the free end of the strip on the lower side a ₃
was 1.0 mm, and steps were provided at vertical intervals _b3 of 25.0 mm. The sintered ore powder particles are separated through a sieve as they roll and fall through the bottom row of strips. In this embodiment, the collecting hopper 2 is placed below the strip material.
7 and 28 were provided to collect the fallen iron ore after sieving and convey it to a predetermined location by belt conveyors 29 and 30. FIG. 11 shows the fixing status of the strips 6 of the three rows of strips in the strip fixing part 5 on the high position side and the arrangement of the free ends of the strips on the low side in the comparative example shown in FIG. 9. FIG. In the comparative example, three steps are provided in the top row, three steps are provided in the second row, and four steps are provided in the bottom row. Near the top strip forming the
The top row of strips forming the bottom row of mountains is the second
The strips were arranged so as to be near the top strip forming the pile of rows. Average inclination angle to horizontal direction is 35°
And so. The horizontal spacing a ₁ , a ₂ , a ₃ and the vertical spacing b ₁ , b ₂ , of the group of strips in the comparative example shown in FIG.
_b3 was set to be the same as the spacing in the example of the present invention shown in FIG. The iron ore powder particles are separated through a sieve as they roll and fall through the top row of strips, fall onto the second row of strips, and are subsequently rolled through the second and third rows of strips. It is separated by a sieve while falling. In the case of the comparative example, as in the inventive example, collecting hoppers 27 and 28 were provided below the strips to collect the fallen iron ore after sieving, and conveyed it to a predetermined location by belt conveyors 29 and 30. In addition, in the present invention, the number of steps of the strips at the strip fixing part and the intervals a ₁ , a ₂ , a ₃ , b ₁ ,
b ₂ and b ₃ are not limited to this example, and are set depending on the particle size and wetness level of the powder or granule, or the required particle size configuration after sieving. Next, the sieving results of Examples 1 to 4 will be explained. Table 1 shows the results of sifting the limestone collected in accordance with Example 1 after conveying it to a predetermined location using a belt conveyor, and Table 2 shows the results of sifting the coke collected in accordance with Example 2 using a belt conveyor. Table 3 shows the iron ore sorted by sieving according to Example 3, and Table 4 shows the iron ore sorted by sieving according to Example 4. Shows the sieving results collected after being transported to a designated location. The sieving performance was expressed as the sieve recovery rate of the target particle size. As is clear from Tables 1 to 4,
By using the sieving device of the present invention, good sieving results were obtained without clogging even with wet powder or granules.

【table】

【table】

【table】

[Table] In the above examples, round steel was used as the strip material, but
The shape of the strip is not particularly limited, and may be a square piece or a pipe. Further, the material of the strip may be any material having rigidity such as various steels, non-ferrous metals, ceramics, synthetic resins, composite materials, etc., and the material is not particularly limited. (Effects of the Invention) As described above, according to the present invention, it is possible to extract particles in any particle size range from a powder or granule, especially a wet powder, thereby meeting the needs for separating the powder or granule using a sieve. It can be done, and the effect is great. Further, although the sieve device of the present invention can obtain sufficiently excellent sieve separation efficiency without providing a vibrating device, there is no problem even if a vibrating device is added.

[Brief explanation of drawings]

Figure 1 A, B, C, and D are diagrams showing examples of the arrangement of upper and lower rows of strip groups, Figure 2 is a diagram showing the arrangement relationship of upper and lower rows of strip groups, and Figure 3 is a sieving device of the present invention. FIG. 4 is a schematic side view of the sieve device shown in FIG. 3; FIGS. 5 and 7 are schematic side views of the sieve device showing other embodiments of the present invention; 6 is a diagram showing the arrangement of strips in the upper and lower rows of the sieve device shown in FIG. 5, FIG. 8 is a diagram showing the arrangement of strips in the upper and lower rows of the sieve device shown in FIG. A schematic side view of a sieving device showing an example, FIG. 10 is a diagram showing the arrangement of strips in the top row, second row, and bottom row of the example of the present invention in FIG. 9, and FIG. 11 is a diagram of the comparative example in FIG. 9. Diagram showing the arrangement of strips in the top row, second row, and bottom row, 1st
Figures 2A and 2B are diagrams showing the dispersion effect of the sieved object on the sieve surface. 1...Hopper, 3...Belt feeder, 4
...Chute, 5...Strip material fixing part on the high position side, 6
...Strip material, 7...Strip material fixing part on the low position side, 8...
Limestone, 9... Coke, 10, 11... Iron ore powder, 14, 15, 18, 19, 23, 24, 2
7, 28... Gathering hopper, 16, 17, 20,
21, 25, 26, 29, 30...belt conveyor.

Claims (1)

[Scope of Claims] 1. A sieve device in which strips are arranged at intervals and tilted in the same direction, and the intervals between the strips are wider at lower positions than at higher positions. The material is divided into two or more groups of strips in the height direction, and the strips of each group have a shape that connects the sieve surfaces of the strips when viewed from the longitudinal cross-sectional direction on both the high and low sides. The strips are arranged to form peaks and valleys, and each strip group is characterized by arranging the strips so that the peaks of the lower row of strips are located near the valleys of the adjacent upper row of strips. sieving device. 2 The ridge surface connecting the sieve surfaces of the strips forming the peaks and valleys of each strip group is formed by three or more strips, and only the high position side of the strip group is fixed with a fixing plate, and the low position A sieve device according to claim 1, wherein the side is a free end. 3. Claims 1 or 2 in which the valleys of the upper row group of strips and the peaks of the lower row group of strips are made of the same strip material.
The sieve device described in Section 1.