JPH0347154B2 - - 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 sieve device consisting of a mesh-like sieve or a plurality of substantially parallel bar members is generally used. In the case of the former mesh sieve, a metal mesh is most widely used, and a typical sieve uses a vibrating 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 sieving devices or the use of multiple sieve devices. In the case of the latter 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 placed in a substantially horizontal state only at their fixed parts. , the strip is gently tilted to such an extent that an object riding 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, and the tip is moved toward the tip of the strip. A sieve device has been proposed in which a sieve surface is formed by arranging adjacent strips at different angles, and the sieve surface is vibrated by a vibrator to cause an object to be sieved to roll and fall. 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 sieve material discharged from the transfer end is separated from the lower sieve material that has fallen from the gap between the strips.
Arrangements are disclosed that undergo one or more sieving operations. Furthermore, in Japanese Patent Application Laid-Open No. 56-155676, two adjacent strips of a plurality of strips arranged in parallel are made substantially horizontal only at their fixed parts, and the tips of the strips are horizontal or slightly inclined downward from the horizontal. A sieve element is formed by arranging adjacent strips at different angles, and a plurality of sieve elements are connected in series so that the sieve element is vibrated by a vibrating device and the object to be sieved rolls and falls. A sieving device configured as follows has been proposed. (Problems to be Solved by the Invention) However, since the sieving devices made of these rods and strips have adjacent strips arranged approximately horizontally at the strip fixing part, it is difficult to handle powder and granular materials, especially wet powders. When separating bodies using a sieve, it is necessary to enlarge the sieve surface in order to improve the sieve separation efficiency, but as mentioned above, the spacing between the strips is small near the strip fixing part where the strips are horizontally arranged. If the sieve surface is small and a large amount of fine powder or sticky wet powder is supplied, these particles tend to accumulate in layers, resulting in a significant decrease in sieving efficiency. moreover,
If the attachment angle of the rod-shaped member with respect to the horizontal plane is small, a vibration device is required to cause the object to be sieved to roll and fall from the gap between the strips. Further, in order to further improve the sieve efficiency, there is 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. SUMMARY OF THE INVENTION An object of the present invention is to solve the problems of the prior art described above, and to provide a sieving device that can achieve any sieving step to any particle size with a simple device even without a vibration device. Still another object is to provide a sieving device that can efficiently sieve wet powder and granular materials. (Means for Solving the Problems) The gist of the present invention is to arrange the strips at an angle so that they extend in the same direction at intervals, with the high position side being a fixed end and the low position side being a free end. , the spacing between the strips is made larger at the lower position side than at the higher position side, and furthermore, the distance between the strips is made to be three or more steps by the plurality of strips in a cross section perpendicular to the axial direction of the strips. A sieve device comprising two or more groups of strips arranged in the vertical direction to form peaks and valleys having In addition to fixing and slanting the side and low-position side shaft ends, the spacing between the strips is made larger at the lower position side than at the higher position side, and furthermore, within a cross section perpendicular to the axial direction of the strips. This is a sieve device in which two or more groups of strips are arranged in the vertical direction so that a plurality of strips form peaks and valleys with three or more steps between the strips. Here, when viewed from the longitudinal cross-sectional direction, the shape connecting the sieve surfaces of the strips is the peak and valley, and in each strip group, among the strips arranged at an angle, the position of the uppermost strip is the peak, and the lowermost strip is the peak. The position of the strip is called the valley. (Function) Examples of the arrangement of the strips on the high-position side and the low-position side of the strip group in the sieve device of the present invention are shown in FIGS. 7 and 8 in cross-section of the strips in the longitudinal direction of the strips. Hereinafter, with reference to FIGS. 7 and 8,
Two typical examples of arrangement in the present invention will be explained. Hereinafter, the height difference in the strips refers to the arrangement of the strips when the ridge surface connecting the sieve surfaces of the strips is formed by slantingly arranging the sieve surfaces of the strips in each group of strips.
A case where a ridge surface is formed by four strips is called a four-step difference, and when the arrangement of the strips arranged at an angle is shown in a side view, an arrangement that looks like three or four strips is called. (1) FIG. 7 is an example in which when steps are provided in the strips on both the high position side and the low position side, the number of steps in the lower row group of strips is greater than the number of steps in the upper row group. 7th
In the illustrated example, the upper row of strips has four steps, and the lower row of strips has five steps. (2) Fig. 8 is an example in which the number of steps in the upper row group of strips is the same as the number of steps in the lower row group when steps are provided in the strips on both the high position side and the low position side. In the example of FIG. 9, the height difference between the upper row material group and the lower row material group is three steps. When the strips are arranged in this way and powder or granules are fed from the higher side of the upper row of strips arranged at an angle, the powder first falls while rolling on the sieve surface made of the upper row of strips. In this case, the finer the particles, the faster they fall from between the strips, and the coarser the particles, the more they fall as they move toward lower positions.
This sieve surface constitutes a surface connecting the strips of the upper row. By providing a sieve surface made of a group of strips under the group of strips in the upper row, the powder and granules falling from the sieve surface in the upper row further fall while rolling on the sieve surface in the lower row. . In this case as well, finer particles fall faster from between the strips, and coarser particles fall while moving toward lower positions. In this way, by forming a plurality of groups of strips in the vertical direction, the sieving efficiency is greatly 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 the upper row of strips) ≧a ₂ (Horizontal spacing of the lower row of strips) b ₁ (Vertical spacing of the upper row of strips) ≧b ₂ (Vertical spacing of the lower row of strips) In the present invention, , in order to make the device more compact, the distance between the lowest row of strips forming the upper row of strips and the top row of the lower row of strips is 100 mm.
within cm, preferably within 50 cm, most preferably within 30 cm
It is best to keep it within cm. Note that the number of steps in the upper and lower rows is not limited to the above example, and can be any number of three or more steps in both the upper and lower rows depending on the particle size of the powder and the required particle size configuration after sieving. The number of steps is set, and the two arrangements in the two-column example described above are combined as appropriate. Note that by increasing the number of steps of the strips in each row, the sieve surface increases and the sieve efficiency improves, so the number of steps of the strips is limited to three or more. In addition, in the case of providing three or more rows of strip groups in the present invention, the three arrangements in the two-row example described above may be combined as appropriate, and the number of steps between the strip groups may be the same for each strip group. Alternatively, it may be changed for each group of strips. The average inclination angle of the longitudinal direction of the strip with respect to the horizontal direction varies depending on the falling speed of the powder particles reaching the strip, but is less than 45°, preferably in the range of 20 to 40°. In addition, regarding the fixing position of the strips, if the length of the strip is short, the spacing between the strips can be maintained stably even if only one side of the strip is fixedly supported.
Only the high position side is fixed, and the low position side is the free end.
In addition, if the strip is long, the spacing between the strips will become unstable if only one side of the strip is fixed and supported, so fix both ends of the high position side and low position side with a fixing plate. Keep the spacing steady. For example, when the supply amount of powder or granular material is small, the length of the strip may be about 50 cm. In this case, only the high position side is fixed, and the low position side is the free end. In addition, when a large amount of powder or granular material is supplied, the length of the strip is about 1.5 m, and both ends of the high position side and the low position side are fixed with fixing plates. In addition, when the length of the strip is about 1 m, only the high position side may be fixed and the low position side may be used as a free end, or both ends of the high position side and the low position side may be fixed with fixed plates. . (Examples) Hereinafter, the present invention will be described in detail based on Examples. Example 1 An example in which limestone powder grains having a particle size of 20.0 mm or less and a moisture content of 2.3% by weight was sieved will be explained based on FIGS. 1 and 2. In FIG. 1, powdered limestone 20 supplied to a hopper 1 is transferred to a belt feeder 2
The material was cut out, dropped into a chute 3, sent to a sieve device, and separated through a sieve via strips 10 and 11 while rolling. In this example, round steel with a diameter of 9 mm was used as the strip material. FIG. 2 is a diagram showing the arrangement of the strips 10 and 11 in the strip fixing parts 4 and 5 shown in FIG.
1 has 5 steps. The average inclination angle of the longitudinal direction of the strips with respect to the horizontal direction was 20°. Also,
The vertical distance between the upper row of strips and the lower row of strips on the high position side was 10 cm as the distance between the lowermost strip of the upper row and the uppermost strip of the lower row (c ₁ shown in FIG. 2). In FIG. 2, the horizontal interval a ₁ between the upper row of strips at the higher-position strip fixing portion is 3.0 mm.
Therefore, if there is no step in the upper row of strips,
Particles larger than 3.0 mm cannot be separated using a sieve, but a 2.0 mm step is provided at the vertical spacing b ₁ of the strip fixing part on the high side, and a horizontal spacing a ₁ of the strip fixing part on the low side is 3.0mm, and vertical spacing b ₁ to 25.0
Since steps are provided at mm intervals, limestone particles larger than 3.0 mm are also 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 2.0 mm, and the vertical spacing b ₂
Since steps are provided at 1.0 mm intervals, horizontal distance a ₂ is 2.0 mm at the low-position side strip fixing part, and steps are provided at 25.0 mm intervals at vertical distance b ₂ .
The limestone is separated through a sieve while rolling and falling through the lower row of strips. That is, fine grains fall faster, and coarser grains roll and fall on the strip material and fall slower. In this embodiment, a collection hopper 3 is placed below the strip.
0, 31, and 32 were provided to collect the fallen limestone after sieving and convey it to a predetermined location by belt conveyors 40, 41, and 42. Example 2 An example in which coke powder having a particle size of 15.0 mm or less and a moisture content of 3.8% by weight was separated through a sieve will be described with reference to FIGS. 3 and 4. In FIG. 3, the powdered coke 21 supplied to the hopper 1 is cut out by the belt feeder 2, and after falling into the chute 3, it is sent to the sieve device, and the strips 12 and 13 are rolled.
It was separated through a sieve. In this example, round steel with a diameter of 9 mm was used as the strip material. FIG. 4 is a diagram showing the arrangement of the strips 12 and 13 in the strip fixing part 4 and the strip free end 6 shown in FIG.
Three steps are provided in the lower row strip material 13. The average inclination angle of the longitudinal direction of the strips with respect to the horizontal direction was 40°.
Further, the distance between the upper row of strips and the lower row of strips on the high position side was set to 30 cm as the distance between the lowest row of upper row and the uppermost strip of the lower row (c ₁ shown in FIG. 4). In FIG. 4, the horizontal interval _a1 between the upper row of strips at the higher-position strip fixing portion is 5.0 mm. Therefore, if there is no step in the upper row of strips, the value is 5.0.
Particles larger than mm cannot be separated using a sieve, but the vertical spacing b ₁ of the fixed part of the strip on the high side is provided with steps of 3.0 mm, and the horizontal spacing a ₁ is 5.0 at the free end of the strip on the low side. mm, and steps are provided at 15.0 mm intervals in the vertical direction b ₁ , so coke particles larger than 5.0 mm are also separated through the sieve as they roll and fall through the upper row of strips, and are subsequently separated into the lower row of strips. fall on top. The horizontal spacing a ₂ of the lower row of strips at the high position side strip fixing part is 3.0 mm, and the vertical spacing b ₂
Since steps are provided at 1.0 mm intervals, the horizontal distance a ₂ is 3.0 mm at the free end of the strip on the low position side, and the vertical distance b ₂ is provided with steps at 20.0 mm intervals.
The coke 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 3 is placed below the strip.
3 and 34 were provided to collect the fallen coke after sieving and convey it to a predetermined location by belt conveyors 43 and 44. Example 3 In this example, an example is shown in which iron ore powder grains with a particle size of 15 mm or less and a moisture content of 4.3% by weight are sieved using a sieve device consisting of three rows of strips, based on Figures 5 and 6. explain. In FIG. 5, the iron ore powder 22 supplied to the hopper 1 is cut out by the belt feeder 2, and after falling into the chute 3, it is sent to the sieve device and passed through the strips 14, 15, 16 while rolling. I divided the flue. Round steel with a diameter of 8 mm was used as the strip. FIG. 6 is a diagram showing how the three strip groups are fixed in the strip fixing parts 5 and 6 shown in FIG. In this embodiment, the top row of strips 14, the second row of strips 1
A three step difference is provided in the strip material 5, and a four step difference is provided in the strip material 16 of the lowest row. The average inclination angle of the longitudinal direction of the strip with respect to the horizontal direction was set to 30°. In addition, the distance between the top row of strips and the second row of strips on the high position side is 20 cm as the distance between the bottom of the top row and the top of the second row (c ₁ shown in Figure 6). The distance between the second row of strips and the bottom row of strips was 15 cm as the distance between the bottom of the second row and the top of the bottom row (c ₂ shown in FIG. 6). In Figure 6, the horizontal spacing a ₁ of the top row of strips at the high-position side strip attachment part is 5.5 mm, and the vertical spacing b ₁ is provided with a step of 3.0 mm, and the strips on the low-position side are The horizontal distance a ₁ at the material fixing part is
Steps of 5.5 mm and 30.0 mm intervals were provided at the vertical interval _b1 . The iron ore powder particles are separated through a sieve while rolling and falling through the strips 14 in the top row, and then fall onto the strips 15 in the second row. The horizontal spacing _a 2 of the second row of strips is the same as the horizontal spacing a ₁ of the top row of strips, but the vertical spacing b ₂ of the second row of strips is the same as the horizontal spacing of the top row of strips. direction spacing
b smaller than ₁ , and the vertical spacing on the high position side b ₂
A step with an interval of 25.0 mm was provided at the vertical interval b ₂ on the lower position side. Iron ore powder grains are the second row of strips 15
The material is separated by a sieve while rolling and falling through the sieve, and subsequently falls onto the strip material 16 in the lowest row. The horizontal spacing a ₃ of the lowest row of strips at the high-position side strip attachment part is 1.0 mm, and the vertical spacing b ₃
Steps were provided at intervals of 2.0 mm, horizontal intervals a ₃ at the lower side strip attachment portion were 1.0 mm, and steps were provided at vertical intervals b ₃ at intervals of 25.0 mm. The iron ore powder particles are separated through a sieve while rolling and falling through the lowest row of strips 16. In this embodiment, collecting hoppers 35 and 36 are provided below the strip 16 to collect the fallen iron ore after sieving and convey it to a predetermined location by belt conveyors 45 and 46. In addition, in the present invention, the number of steps of the strip at the strip fixing part and the spacing between the strips a ₁ , a ₂ , a ₃ , b ₁ ,
b ₂ , b ₃ , c ₁ , and c ₂ are not limited to those in this example, and can be 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 3 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 sieve sorting results recovered after the iron ore sieved according to Example 3 was conveyed to a predetermined place by a belt conveyor. The sieving performance was expressed as the sieve recovery rate of the target particle size. As is clear from Tables 1 to 3,
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] In the examples, round steel was used as the strip, but the shape of the strip is not particularly limited, and may be a square bar or a pipe. Further, the material of the strip material may be any of various steels, non-ferrous metals, ceramics, synthetic resins, composite materials, and other materials having rigidity, 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 powder or granular material, especially wet powder, and it meets the needs in the field of sieving powder or granular material. 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]

FIG. 1 is a schematic side view showing one embodiment of the sieve device of the present invention, FIG. 2 is a diagram showing the arrangement of strips on the high position side and low position side of the sieve device in FIG. 1, and FIG. 4 is a schematic side view showing another embodiment of the present invention, FIG. 4 is a diagram showing the arrangement of strips on the high position side and low position side of the sieve device of FIG. 3, and FIG. 5 is a schematic side view showing another embodiment of the present invention. 6 is a schematic side view showing the embodiment; FIG. 6 is a diagram showing the arrangement of strips on the high position side and low position side of the sieve device in FIG.
8 are diagrams showing typical arrangement of strips in the sieve device of the present invention. 1...Hopper, 2...Belt feeder, 3
...Chute, 4...Strip fixing part on the high position side, 5
... Strip fixing part on the low position side, 6 ... Strip free end, 10, 11, 12, 13, 14, 15, 16
... Strip material, 20 ... Limestone, 21 ... Coke,
22...Iron ore, 30, 31, 32, 33, 3
4, 35, 36...Collection hopper, 40, 41,
42, 43, 44, 45, 46...belt conveyor.

Claims (1)

[Claims] 1. The strips are arranged at an angle so that they extend in the same direction at intervals, with the higher position side being a fixed end and the lower position side being a free end, and the lower the position, the higher the side. The distance between the strips is made larger than the above, and furthermore, in a cross section perpendicular to the axial direction of the strips, a plurality of strips form peaks and valleys having three or more steps between the strips. A sieve device in which two or more groups of strips are arranged in the vertical direction. 2. The shaft ends of the high position side and the low position side are fixed and arranged at an angle so that the strips extend in the same direction at intervals, and the spacing between the strips is smaller on the lower side than on the higher side. A group of strips arranged such that a plurality of strips form peaks and valleys having three or more steps between the strips in a cross section perpendicular to the axial direction of the strips. , a sieve device that is arranged in two or more groups in the vertical direction.