JPS62114689A - Screening device - Google Patents

Abstract

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

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to the field of processing powder.

In particular, the present invention relates to a sieving device that is effective for sieving wet powder.

(Prior Art) Sieve nets are generally used in industrial sieve machines, and there are many types of metal nets in particular, and they are widely used. These general sieves have a structure in which the sieves are separated into two levels of particle size: on the screen and under the screen. In the case of sieving into three or more levels of particle size, the sieve is divided into two or more stages, or the sieving is performed using a plurality of sieving machines.

(Problems to be Solved by the Invention) The conventional sieving device described above tends to clog when separating powder, especially wet powder, and the sieve is complicated when separating it into multiple stages. However, there is a problem in that the cost increases due to the use of S or a plurality of sieving machines, which causes difficulties in terms of workability and maintenance.

It is an object of the present invention to solve the problems of the prior art and to provide a sieving device that can achieve any sieving step to any particle size with a simple YE setting.

Still another object is to provide a sieving device that can efficiently sieve wet powder.

(Means 2 for determining the problem) The present invention is characterized by arranging the strips at intervals and tilting them in the same direction.
A step is provided on at least a part of the low position side or both the low position side and the high position side, and the interval between the strips becomes wider as the position goes lower than on the higher position side. This is a sieving device that If necessary, add a means to vibrate the sieve machine or blow gas onto the strips to eliminate clogging.

With this device configuration, if powder is supplied from the higher side of the inclined strips, the fine powder will fall quickly from between the strips, and the coarse particles will roll on or between the strips. while moving to a lower position and falling.

Therefore, by providing a partition plate at the bottom of this sieve device and adjusting the interval between the partition plates, it is possible to separate particles of arbitrary particle size. In addition, it is also possible to set a plurality of moving belts in the direction across the longitudinal direction of the strip using the lower blade of the strip without providing the partition plate, and collect the falling powder separately by belt, so that the powder can be divided into a predetermined particle size range. Can be separated.

(Example 1) Hereinafter, an example in which coke powder having a moisture content of 7.5% is separated will be explained based on FIG. 1.

The coke powder 2 supplied to the hot groove 1 is cut out by a belt feeder 3, falls into a chute 4, is sent to a sieve device, and is separated through a sieve via a steel wire 6 while rolling.

The present invention is characterized in that the steel wire is tilted and at the same time, at least a portion of the wire is attached with a step.

In this embodiment, the horizontal spacing between the steel wires 6 in the steel wire upper attachment portion 5 is 1.01. Therefore, if both ends of the steel wire 6 are not stepped, particles exceeding 1.0 part cannot be separated by a sieve, but the steel wire 6 is attached to the steel wire 6 for 20 m at the lower attachment part 7 of the steel wire.
Since the interval is stepped, even coke particles larger than 1.01 are separated through the sieve while rolling and falling through the steel wire 6.

In other words, the fine particles fall quickly, and the coarse particles roll on the steel wire and fall slowly. At this time, three partition plates 16 were provided below the steel wire at equal intervals, and the falling coke was sieved into four groups using the partition plates 16. For the sieving portion, post-cokes 8 to 11 were conveyed by belt conveyors 12 to 15.

Table 1 shows the conditions for the sieve, and Table 2 shows the conditions for the sieve.
Indicates the weight percentage of the stages.

As is clear from Table 2, it was possible to sieve the particles into four levels of particle size. In this case, by increasing or decreasing the number or spacing of the partition plates 16, the particle size level of the sieve can be freely set.

(Example 2) The fine coke of 1.0 m or less that was sieved in Example 1 was granulated into mini pellets of 5.0 m or less using an Eilich mixer, and then the fine coke was sieved into mini-pellets, as shown in Figure 4 below. I will explain based on.

Same as Example 1, mini pellet coke 26 after granulation
The material was cut out from the hopping 1 by a belt conveyor 3, dropped into a chute 4, and then sieved into a sieve device via a steel feed line 6.

In this example, a nobbler 19 was attached to the lower steel wire attachment portion 7, and the steel wire was separated through a sieve while applying vibrations. By applying vibration, clogging can be prevented and sieving can be done easily.

Partition plate 1 prevents the mini pellet coke falling from between the steel wires.
6, the particles were separated into particles with a particle size above 1.0 and particles below 1.0.

After the sieving, the mini pellet coke 20.21 was conveyed by a belt conveyor 12.13.

Table 3 shows the conditions for sieving.

Table 3 Conditions for the sieve The steel wire 6 was attached to the lower steel wire attachment portion 7 in a V-shape as in Example 1.

Table 4 shows the weight ratio after sieving.

Table 4 The sieve fraction was divided into h2 particle sizes as is clear from the weight ratio No. 48 below.

(Example 3) Below, the particle size is 3. The flow of limestone powder of Om+ or less will be explained based on FIGS. 5 and 6.

The limestone powder 27 supplied to the hora-zo-1 was cut out by the belt feeder 3, fell into the chute 4, and then sent to the sieve device, where it was separated into sieves through the steel +1!6 while rolling. In this example, a gas blowing device 28 is provided on the top of the sieve device, and the sieve portion is sometimes connected to the air blowing nozzle 2.
Air was blown at a wind speed of 4 to 0.7 m/s.

By blowing air, the sieves can be separated easily and clogging is reduced. In this case, as shown in FIG. 6, the steel wire is also attached to the steel wire upper attachment portion 5 with a zero diameter.
I added a step of 5sm.

Separate the falling limestone from over 0.50m and 0.50m using the partition plate 16.
The sieved limestone 22 of 0.50 tm or less was separated into powdered limestone 22 on the belt conveyor 12r, and the sifted limestone 23 of more than 50 tm was conveyed on the belt conveyor 13.

Table 5 shows the conditions for sieving.

The steel wire 6 was attached to the lower steel wire attachment portion 7 in a V-shape as in Example 1.

In Table 6, the sieve portion shows the latter *amount ratio.

Table 6 As is clear from Table 6 of the weight ratio, the sieve fraction was divided into two particle sizes.

In the above embodiments, all of the strips are arranged in a V-shape with steps, but they may also be arranged in a U-shape, or they may be arranged in a U-shape, or they may be arranged in a U-shape as shown in FIG. 7(a). Furthermore, steps may be provided only in a part of the strips arranged as shown in FIGS. ), it is also effective to arrange a certain number of mounting holes at two or more levels in the vertical direction (example where No. 71A(C) is arranged at two levels). The materials can also be arranged regularly or irregularly over the entire surface of the mounting plate.

In this way, by providing a step at least in part of the arranged strips, the rolling of the charged powder is promoted, and at this time, the coarse particles move downward, so classification by particle size is promoted. Ru. In addition, since the portion provided with a one-step difference also acts as a flow path for the powder, the efficiency of classification is improved.

On the other hand, arranging one strip in parallel in the horizontal direction without providing any steps is suitable for separating grains into two groups, one above and below a specific grain size determined by the set spacing of the strips, but this Unlike the invention, the powder rarely rolls on or between the strips, so the classification ability is poor, and it is difficult to further separate the powder under the sieve into multiple particle size ranges. Not suitable for use.

In addition to the wire rods shown in the embodiments, the wire rods used in the sieve of the present invention may be round rods or FIGS. 8(a) and 8(b).
), (C), and (d) may be used, or it may be made of double nozzle and rotated by a bearing as shown in (e) of the same figure.

Alternatively, as shown in FIG. 2(f), the strips can be made into grooves and ventilation can be carried out through pipes.

It is also effective to connect the mounting portions of the strips with springs to provide tension and prevent clogging.

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, according to the present invention, it is possible to extract particles in any particle size range from powder, especially wet powder, and it is possible to meet the needs in the field of sieving powder. The effect is great.

[Brief explanation of drawings]

FIG. 1 is a schematic side view of a sieve device showing an embodiment of the present invention. FIGS. 2 and 3 are diagrams showing how the strip is taken into the lower attachment part, and FIG. 4 is a schematic side view of a sieve device showing another embodiment of the present invention. FIG. 85 is a schematic side view of a sieve device showing still another embodiment of the present invention. Fig. 6 is a diagram showing the installation of the strip to the upper mounting part, and Fig. 7 is a diagram showing another example of the situation of the installation of the strip. FIG. 8 is a diagram showing an example of the shape of the strip. l...Popper, 2...Coke powder, 3...Belt eye 1der, 4...Chute, 5...Steel wire upper attachment part. 6... Steel wire, 7... Steel wire lower attachment part, 8, 9, 10
゜11...Flue portion is post-coke, 12. 13.1
4゜15...Belt conveyor m16"" partition plate, 17
...Steel wire step at lower steel wire attachment part, 18-...Steel wire interval,
19... Vibrator, 20, 21... Sieve portion is rear mini pellet coke, 22.23-... Sieve portion is rear powder limestone, 24... Air blowing nozzle, 25.
...Steel wire upper mounting part steel wire step, 26...Mini pellet coke, 27...Limestone powder, 28...Gas blowing device. Agent Patent Attorney Masamitsu Akizawa and 2 others Voluntary procedure amendment March 20, 1986

Claims (4)

[Claims] (1) The strips are arranged at intervals and tilted in the same direction, and a step is provided on at least a part of the low position side or both the low position side and the high position side, and the low position side is provided with a step. I see, the sieving device is characterized in that it is configured such that the spacing between the strips becomes wider from the higher position side. (2) The sieve device according to claim 1, which is provided with means for imparting vibration to the strip material. (3) The sieve device according to claim 1, wherein a gas blowing means is provided adjacent to the strip. (4) The sieve device according to claim 1, 2 or 3, wherein a partition plate is provided below the strip and in a direction intersecting the extending direction of the strip.