JPS6388086A - Sieving device - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention provides a sieving device which is effective for separating wet powder into powder and granular materials in the field of processing powder and granular materials. (Conventional Technique) As an industrial sieve device, a sieve device consisting of a plurality of substantially parallel rods is generally used as a mesh sieve.

In the case of the former mesh sieve, metallic N4 is most widely used, and a typical sieve has a structure in which the sieve is divided into two levels of particle size: above the mesh and below the mesh by shaking the sieve with a Calo vibration device. It becomes complicated. Therefore, when sieving particles into three or more levels of particle size, sieving is carried out using a plurality of sieving devices each having a vibration device.

However, mesh sieve devices are prone to clogging when separating powder and granular materials, especially wet powder and granular materials.

In addition, when dividing the sieve into several stages, there are problems in that the sieve structure is complicated, resulting in difficulties in terms of workability and maintenance, and in cost increase due to the use of a plurality of sieve devices.

In the case of the latter sieve made of substantially parallel rods and strips, for example, Japanese Patent Publication No. 43-27379 discloses the following.

Two adjacent strips of a plurality of strips arranged in parallel are placed in a substantially horizontal state only at their fixed parts, so that an object riding on one strip does not slide on the strip due to the action of gravity. A sieve surface is formed by gently inclining a strip to a certain extent, and with the tip of the strip as a free end, adjacent strips are arranged at different angles toward the tip of the strip to form a sieve surface. A sieve device has been proposed that vibrates the sieve surface and causes the object to be sieved to fall.

Furthermore, in the above patent publication, in order to further improve the separation accuracy of the object to be sieved, a plurality of sets of one strip material are arranged in the vertical direction,
The vibrating device vibrates each sieve surface and separates the upper sieve material that rolls on one strip and is discharged from the transfer end from the lower sieve material that falls from the gap between the two strips. Furthermore, a configuration is disclosed in which the sieve is affected by Vc once or multiple times.

Furthermore, in Japanese Patent Application Laid-Open No. 56-155676, a sieve element is formed by arranging two adjacent strips of a plurality of strips arranged in parallel at different angles, and the sieve rope is A sieving device has been proposed in which a plurality of sieves are arranged in series to vibrate the sieve and cause the object to be sieved to roll and fall.

(Problems to be Solved by the Invention) However, since these sieve devices made of rods and strips are arranged substantially horizontally at the strip fixing part, it is difficult to handle powder or granular materials, especially wet powder particles. When dividing the body using a sieve, it is necessary to enlarge the sieve surface in order to improve efficiency, but as mentioned above, the l'dJ distance between the strips is Because it is small, the sieve surface is small.

When a large amount of fine powder or sticky wet powder is supplied, the efficiency of the sieving portion decreases significantly as soon as the fine powder or sticky wet powder is deposited in a layer. Furthermore, when the rod-shaped member is attached to a horizontal surface at a small angle, a vibrating 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 sieve device that can obtain any particle size and any sieve step 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 intervals and tilting them in the same direction, and the spacing between the strips becomes wider as they move towards the lower position than towards the higher position. In a sieving device arranged in this manner, one strip is divided into two or more strip groups in the height direction, and the strips of each strip group are Is it arranged so that the shape connecting the sieve surfaces of the strips forms peaks and valleys? This is a unique sieve device.

The strips of each strip group have three shapes connecting the sieve surfaces of the strips when viewed from the longitudinal cross-sectional direction on both the high position side and the low position side.
Mountains and valleys are formed using strips larger than a book.

And only the high position side is fixed with a fixing plate, and the low position 1f! I!
be the free end, and the strips of each strip group have a shape that connects the sieve surfaces of the strips on both the high side and the low side when viewed from the longitudinal cross-sectional direction. forming a valley,
It is also preferable to fix both ends of the high position side and the low position side with fixing plates.

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 to 9 with respect to a cross section of one strip in the longitudinal direction. Hereinafter, three typical examples of arrangement according to the present invention will be explained based on FIGS. 7 to 9.

Hereinafter, a step in one strip means a three-step difference in the arrangement of strips when the ridge surface connecting the sieve surfaces of one strip in each strip group is formed by slanting three 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) Figure 7 shows an example in which when steps are provided in the strips on both the high position side and the low position side, there are more steps in the upper row group than in the lower row group. In the example shown in the figure, there are four steps in the upper row of strips.

The lower row of strips has five steps.

(2) FIG. 8 is an example in which when two steps are provided in the strips on both the high-position side and the low-position side, the number of steps is smaller in the upper row group of strips than in the lower row group. In the example shown in FIG. 8, the upper row group of strips has three steps, and the lower row strip group has two steps.

(3) FIG. 9 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 of strips 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 manner 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 shifting over the sieve surface made of the upper row of strips. In this case, the fine particles fall quickly from between the strips, and the coarse particles move to the lower position side while falling. This sieve surface constitutes the surface that connects the strips in the upper row.

By further providing a sieve surface made of a group of strips under the group of strips in the upper row, the powder and granules that have fallen from the sieve surface in the upper row further fall while being transferred over the sieve surface in the lower row.

In this case as well, the fine particles fall quickly from between the abrasive strips, and the coarse particles move to the lower position and fall. In this way, by forming a plurality of groups of strips in the vertical direction, the sieving efficiency is greatly improved.

Furthermore, the horizontal spacing and vertical spacing of each strip seen from the longitudinal direction in the upper row strip group and the lower row strip group are as follows.

From the viewpoint of the basic function of the sieve, it is preferable that both the high # side and the low # side be within the following ranges.

al (horizontal spacing of the upper row of strips)≧a2 (horizontal spacing of the lower row of strips b, (vertical spacing of the upper row of strips)≧b2 (vertical spacing of the lower row of strips) From the point of view of compactness, the lowest row of strips forming the upper row of strips,
It is preferable that the distance between the uppermost strips of the group of strips in the lower row be within 100, preferably within 50 cm, and most preferably within 30 α.

Note that the number of steps in the upper and lower rows is not limited to the above example, and any number of steps can be set in both the upper and lower rows depending on the particle size of the powder and the required particle size composition after sieving. and suitably combine the three arrays in the two-column example described above. In addition.

By increasing the number of steps between the strips in each row, the sifting surface increases and the sifting efficiency improves.

The number of steps in the strip is preferably three or more.

In addition, in the case where three or more rows of strip groups are provided in the present invention, three or more arrangements in the two rows example described in # are appropriately combined, and the number of steps in one strip group is the same for each strip group. It may also 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 reaching the strip, but it is 45
less than 0°, preferably in the range of 20 to 400.

Regarding the fixing position of 1 strip, if the length of 1 strip is short, the spacing between the strips can be maintained stably by fixing and supporting only one side of 6 strips, so only the high position side can be fixed. fixed,
The lower position side is the free end.

In addition, if the 6-strip material is long, the spacing between the 5-strip materials will become unstable if only one side of the 5-strip material is fixedly supported. Keep the spacing steady. For example, when the supply amount of powder or granular material is small, the length of one strip may be about 5000, and in this case, only the high position side is fixed, and the low position side is the free end. In addition, if the amount of powder or granular material to be supplied is large, the length of one strip should be approximately 1.5 m.
Fix both ends of the high position side and low position side with fixing plates.

In addition, when the length of one 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. Alternatively, both ends of the high position side and the low position side may be fixed with a fixed plate. .

(Example) Hereinafter, the present invention will be explained in detail based on Examples.

Example 1 An example in which limestone powder grains having a grain size of 20.0 m11 or less and a moisture content of 2.3 ffifi% was sieved will be explained based on FIGS. 1 and 2. In FIG. 1, granular limestone 20 supplied to a hopper 1 is cut out by a belt feeder 2, dropped into a chute 3, and then transferred to a sieving device via strips 10 and 11 while being transferred. I divided the flue. In this example, round steel having a diameter of 91 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. 5 steps were added to the floor. The average inclination angle of the longitudinal direction of the strip 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 is:

The distance between the lowermost strip in the upper row and the uppermost strip in the lower row (C7 shown in FIG. 2) was 10 cnt.

In the second factor, the horizontal interval a1 of the upper row of strips at the strip fixing part on the high position side is 3.0 m.

Therefore, if there is no step in the upper row of strips, 3-Ow
Particles larger than m cannot be separated by sieving, but a step of 2.0 cm is provided in the vertical interval b1 of the strip fixing part on the high position side.
The horizontal spacing a at the strip fixing part on the low position side is 3-
4, and the horizontal distance between the lower row of strips at the higher position side strip fixing part is a2: 2.0, and 1.0- for vertical spacing b2
A step is provided in the interval, and the horizontal interval a2 is 2-Otea at the strip fixing part on the lower position side, and the vertical interval b2
This is because there are steps at 25.0 ms intervals.

The limestone is separated through a sieve while rolling and falling through the lower row of strips. That is, the fine particles fall quickly, and the coarse particles roll and fall on the strip material and fall slowly.

In this example, a collective ramper of 30°31.
A sieve was installed to collect the fallen limestone and convey it to a predetermined location by a belt conveyor 40,41,42.

Example 2 Particle size 15.01m1! An example in which coke powder having a moisture content of 3.8% by weight or less is sieved will be explained based on FIGS. 3 and 4. In FIG. 3, granular coke 21 supplied to a hopper 1 is cut out by a belt feeder 2 and dropped into a neat 3.

The mixture was sent to a sieve device and separated through a sieve via strips 12 and 13 while rolling. 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 portion 4 and the strip free end 6 shown in FIG. 3. In this embodiment, the upper row strip 12 has five steps.

Three steps are provided in the lower row strip material 13. The average inclination angle of the longitudinal direction of the strip with respect to the horizontal direction was 40°. The distance between the upper row material and the lower row material on the high position side is the distance between the lowest row material in the upper row and the top row material in the lower row (cl shown in 4th iK)
It was set as 30 bi.

In FIG. 4, the horizontal distance a1 between the upper row of strips at the higher-position strip fixing portion is 5.0 m. Therefore, if no step is provided in the upper row of strips, particles with a particle size of more than 5.0 will not be separated by the sieve, but if a step of 3.0aI + interval is provided in the vertical interval b1 of the strip fixing part on the high position side, At the free ends of the strips on the lower side, the horizontal spacing a1 is 5.0 m, and the vertical spacing b1 is stepped at intervals of 15-0 m, so that coke particles exceeding 5-Otxs also fall into the upper row strips. The material is separated by a sieve while falling through the sieve, and subsequently falls onto the lower row of materials.

The horizontal spacing a2 of the lower row of strips at the high position side strip fixing part is 3-Om, and the vertical spacing b2 is 1.0.
Steps at m intervals? The horizontal spacing a2 at the free end of the strip on the low position side is 3.0 m, and the vertical spacing b2
There are steps at 20.0 m intervals, and the coke is separated through a sieve while being transferred and falling through the lower row of strips.

That is, the grains fall quickly, and the coarse grains fall slowly as they move over the grains.

In this embodiment, collecting hoppers 33 and 34 are provided below the strips, and the sieves collect the coke that falls later.

It was conveyed to a predetermined location by belt conveyors 43 and 44.

Example 3 In this example, an example is shown in Figs. 5 and 6 in which iron ore powder grains with a particle size of 15 or less and a moisture content of 4.3 weight t% are separated using a sieve device consisting of three rows of strips. This will be explained based on the diagram.

In Fig. 5, the iron ore powder 22 supplied to the hot rod 1 is cut out by the belt feeder 2, and after falling into the chute 3, it is sent to the sieving device, and the strip material 1 is rolled.
4, 15, and 16 through a sieve. The diameter of the strip is 81
round steel was used.

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. Three steps were provided in the second row of strips 15, and four steps were provided in the bottom row of strips 16. The average inclination angle of the longitudinal direction of the strip with respect to the horizontal direction was 30°. Also, 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 shown in Figure 6). 6 Umbrella - Temple 4. The distance between the second row of strips and the lowest row of strips was 15 steps (c2 shown in FIG. 6) between the bottom of the second row of strips and the top of the bottom row of strips.

In Fig. 6, the horizontal spacing a1 of the top row of strips at the strip attachment part on the high side is 5.5 mm, and a step is provided with a vertical spacing bIK3.0 spacing, and the strips on the low side The horizontal interval a1 in the material fixing part was 5.5 meters, and the vertical interval b1 was provided with steps at intervals of 30.0 m. The iron ore powder particles are separated by a sieve while falling through the top row of strips 14, and then fall onto the second row of strips 15.

The horizontal spacing a2 of the strips in the second row is the same as the horizontal spacing a1 of the strips in the top row, but the vertical spacing b2 of the strips in the second row is the horizontal spacing b1 of the strips in the top row. Very small steps were provided, with the vertical spacing b2 on the high position side being 2.0 m, and the vertical spacing b2 on the low position side being 2.0 m apart. The iron ore powder particles are separated through a sieve while rolling and falling through the second row of strips 15.

Subsequently, it falls onto the bottom row of strips 16.

The horizontal spacing a3 of the lowest row of strips in the strip attachment section on the high position side is 1.01, and the vertical spacing b6 is 2.0.
! A step with an interval of MlI+ is provided, and the horizontal interval a5 at the strip attachment part on the lower side is 1. At OIm, steps were provided at 25.0 m intervals at the vertical interval b3. The iron ore powder particles are separated through a sieve while being transferred and falling through the strips 16 in the lowest row.

In this embodiment, a collective hopper 35.3 is provided below the 1-strip material 16.
A sieve was installed to collect the fallen iron ore and transported it to a location with a fixed rate of 1Fr by a Peltoco/Pair 45.46.

Note that in the present invention, the number of steps of the strips in the 6-strip fixing portion and the spacing between the strips a1 * a2 * a5, b
l.

b21 b5 m CI I C2 is not limited to 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 results of Examples 1 to 3 will be explained.

Table 1 shows that the limestone sieved according to Example 1 is conveyed to a predetermined location by a belt conveyor.

Table 2 shows the results of the recovered sieve portion, and Table 2 shows the results of the 6 sieve portions recovered after conveying the coke that was sieved according to Example 2 to a predetermined location on a belt conveyor, and Table 3 shows the results of the sieve portion that was sieved according to Example 3. The results are shown for each sieve collected after conveying iron ore to a predetermined location on a belt conveyor.

The results for the sieve fraction were expressed as the sieve recovery rate of the target particle size. As is clear from Tables 1 to 3, K.

By using the sieving device of the present invention, there was no clogging even with wet powder and granules, and a good sieving product was obtained. Sieve Results Table 3 In the sieve results example of Example 3, round steel was used as the strip, but the shape of each strip is not particularly limited, and may be square or nozobe. Also 1
Materials for the strips include various steels, non-ferrous metals, ceramics,
Any material may be used as long as it has rigidity such as synthetic resin, composite material, etc., and the material is not particularly limited.

(Effects of the Invention As described above, 1) According to the present invention, it is possible to extract particles in any particle size range from powder or granular material, especially wet-temperature powder or granular material, and it meets the needs of the field of sieving powder or granular material. It can be done, and the effect is great.

In addition, the sieve device of the present invention can obtain sufficient efficiency as a sieve without providing a vibrating device;
There is no problem in adding an excitation device.

[Brief explanation of the drawing]

FIG. 1 is a road side view showing one embodiment of the sieve device of the present invention, FIG. 21 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. The road side view showing another embodiment of the invention, FIG. 4 is a diagram showing the arrangement of the strips on the high position side and the low position side of the sieve device of FIG. 23, and FIG. 5 shows still another embodiment of the invention. FIG. 6 is a road side view showing an example, and FIG. 7 is a diagram showing the arrangement of the strips on the high position side and low position side of the sieve loading row of FIG. 5. FIGS. 8 and 9 are diagrams showing typical arrangement of strips in the sieve device of the present invention. l...hopper, 2...belt fee/-, 3-°
・Chute, 4... High-level It side strip material fixing part, 5...
・Low position side strip fixing part, 6... Strip free end, 10.
11゜12.13, 14.15.16... Strip material, 20
... Limestone, 21... Coke, 22... Iron ore, 30, 31° 32.33.34.35.36... Collection hopper. 40.41,42,43,44,45.46...belt conveyor. Agent Patent Attorney Masaaki Aki Sawa Mitsunobu 1 talent 1 diagram N Shikiben 3 diagrams (high r'fryI flight'th/]. ] n. 00 Ribirioo o□ ij%T?l,!a group o 1

Claims (3)

[Claims] (1) In a sieve device, the strips are arranged at intervals and tilted in the same direction, and the spacing between the strips is wider at lower positions than at higher positions. The strips of each strip group are divided into two or more groups in the direction, and the shape connecting the sieve surfaces of the strips on both the high side and the low side when viewed from the longitudinal cross-sectional direction has peaks and valleys. A sieve device characterized in that it is arranged so as to form a sieve. (2) The strips in each strip group have a shape that connects the sieve surfaces of the strips on both the high side and the low side when viewed from the longitudinal cross-sectional direction, forming peaks and valleys with three or more strips. The sieve device according to claim 1, wherein only the high position side is fixed by a fixing plate, and the low position side is a free end. (3) The strips of each strip group have a shape that connects the sieve surfaces of the strips on both the high side and the low side when viewed from the longitudinal cross-sectional direction, forming peaks and valleys with three or more strips. The sieve device according to claim 1, wherein both ends of the high position side and the low position side are fixed by fixing plates.