JPH0370556B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a classification device that efficiently classifies powder and granules into fine particles and coarse particles even if the particles contain a large amount of water.

(Prior Art) Some powder and granule classification apparatuses have conventionally been configured as follows.

That is, a slope body that slopes downward and forward is provided. This inclined body causes the powder and granular material supplied to its upper part to fall toward the lower part along its upper surface side. A large number of slits extending in the left-right direction are formed in the inclined frame. Among the powder particles falling on the slope, the fine particles smaller than the longitudinal dimension of the slit pass through the slit on the way down and fall below the slope, while the remaining coarse particles fall at the bottom of the slope. It is expelled from the side. In this way, the granular material is classified into fine particles and coarse particles according to the front and rear dimensions of the slit.

(Problems to be Solved by the Invention) Incidentally, wet powder particles tend to adhere to other objects. Therefore, when classifying such wet powder and granular materials using the above classification device,
The powder particles adhere to the inclined body and cause clogging of the slit. In such a case, the particle size of the granular material that can pass through the slit becomes smaller than a desired value, resulting in a disadvantage that the classification efficiency of the classification device is reduced.

Further, if the classification operation is continued in this state, the slits will become more clogged, so it will be necessary to periodically clean the slits, but such operations are troublesome.

(Object of the Invention) The present invention was made in view of the above-mentioned circumstances, and it is possible to obtain the desired classification efficiency even when the powder or granular material is in a wet state, and to reduce the slit cleaning work. The purpose is to make it easier.

(Structure of the Invention) A feature of the present invention for achieving the above object is that a detector is provided to detect the moisture content of the powder or granular material to be supplied onto the bar member group, and the moisture content The front and rear dimensions of the slit in plan view are made variable to correspond to the above, and each of the bar members is fitted to the inclined frame supporting each of the above bar members so as to be movable in the left and right direction, and the left and right sides of each of the above bar members are fitted. The dimension is set to be more than twice the left and right inner width dimension of the inclined frame.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

In the figure, reference numeral 1 denotes a powder classifier. This classifier 1 separates powder M, such as iron ore, discharged from an ore storage site onto a belt conveyor 2 by a reclaimer into fine particles S and coarse particles L. It is classified and discharged. Then, the classified fine particles S and coarse particles L are conveyed to the pellet ore storage tank and the sintering ore storage tank by separate conveyors.

The above-mentioned classification device 1 will be explained. For convenience of explanation, the direction indicated by arrow Fr in the figure is assumed to be the front of this classification device 1.

The classification device 1 has a tilting body 6. Further, this inclined body 6 has an inclined frame 7 which is inclined toward the front and lower side, and left and right (referring to the direction toward the front, the same shall apply hereinafter) side plates 8, 8 forming this inclined frame 7. A large number of bar members 9 extending horizontally in the horizontal direction of the inclined body 6 are supported at both ends thereof, and slits 11 are formed between the adjacent bar members 9, respectively.

The longitudinal dimension a of the slit 11 increases from 15 mm to 18 mm to 21 mm to 24 mm as it progresses from the rear end to the front end.

At the inner rear part of the inclined frame 7, there is provided a buffer plate 1 for receiving the granular material M supplied from above the belt conveyor 2.
0 has been set up. Therefore, the powder M once falls from the belt conveyor 2 onto the buffer plate 10, and then is supplied to the upper surface of the group of bar members 9 inside the inclined frame 7.

The granular material M supplied as described above is fed to the bar member 9
It falls forward and downward along the top side of the group. During this fall, the fine particles S of the powder or granular material M pass through the slit 11 and fall below the group of bar members 9. On the other hand, the remaining coarse particles L are discharged from the front end side of the bar member 9 group without passing through the slit 11.
As a result, the powder M is classified into fine particles S and coarse particles L.

In particular, as shown in FIG. 2, the rear end of the inclined frame 7 is pivotally supported by a pivot shaft 12 on a pedestal (not shown), and the front end is vertically movable. The front end of this inclined frame 7 and the first motor cylinder 31 are interlocked and connected by a coupling member 46, and the extending and contracting operation of this first motor cylinder 31 (arrow H in FIG. 1) causes the inclined body 6 to rotate downward. Rotating posture (second
(indicated by a solid line in the figure) and an upwardly rotated posture (indicated by a dashed-dotted line in FIG. 2).

When the tilted body 6 is in a downward rotating posture, the tilt angle of the tilted body 6 with respect to the horizontal plane is α=60°,
On the other hand, the inclination angle in the upward rotational posture is β=45°.

If the angle of inclination of the inclined body 6 is α, then the longitudinal dimension l' of the slit 11 in plan view becomes narrow, ranging from 7.5 mm to 12.0 mm, as shown in FIG.

On the other hand, the above-mentioned inclination angle is set to the above-mentioned β which is smaller than the above-mentioned α.
Then, as shown in FIG. 4, the front-to-back dimension l of the slit 11 in plan view becomes as wide as 10.6 mm to 17.0 mm.

The classification device 1 is provided with a deposit removing device 48 that removes the powder M deposited on the bar member 9 and cleans the slit 11.

A long hole 49 extending in the longitudinal direction is formed in the side plate 8 of the inclined frame 7, and each bar member 9 is fitted into the long hole 49 so as to be able to move left and right. The horizontal dimension w of each of these bar members 9 is more than twice the horizontal internal width dimension w' of the inclined frame 7, and the horizontal internal width dimension w' of this inclined frame 7 corresponds to the horizontal dimension of the belt conveyor 2. I have let you. In addition, each of the above bar members 9
Both ends are connected by a pair of left and right connecting plates 50, 50'. A second motor cylinder 51 is operatively connected to the left side connecting plate 50 of the two connecting plates 50, 50'.

The inner side of both side plates 8, 8 and both connecting plates 50, 5
A scraping plate 53 is provided inside each 0'. Each of these scraping plates 53 is formed with a notch 54 corresponding to a predetermined mounting pitch of the bar member 9, and each bar member 9 is fitted into each of these notches 54 so as to be movable left and right. The mounting plate 53 is fastened to the side plate 8, the connecting plate 50, etc. using screw members 55.

When the second motor cylinder 51 is expanded and contracted (as shown by arrow P in FIG. 1), each bar member 9 repeats reciprocating movement in the left and right direction (the
(From the figure to the arrow R shown in Fig. 7). At this time, deposits M' on the bar member 9 shown in FIG.
It is removed from the bar member 9 by being scraped off by both scraping plates 53, 53 provided inside each of the bar members 8. Therefore, the longitudinal dimension of each slit 11 is maintained at a predetermined value, and the slit 11 allows the powder and granular material M to be
is accurately classified into fine particles S and coarse particles L.

A detector 21 that continuously detects the moisture content of the powder M on the belt conveyor 2 is provided. The detector 21 is connected to the first motor cylinder 31 and the second motor cylinder 51 via the control panel 22, and the detection signal of the detector 21 causes the cylinders 31, 51 to
can be operated as described above.

When the moisture content of the granular material M on the belt conveyor 2 is in a dry state, for example, less than 4%, the first motor cylinder 31 is actuated by the detection signal of the detector 21 that detects this, and the inclined body 6 is in a downward rotating position, and the deposit removing device 48 is kept in a stopped state.

In the above case, the powder M is coarse particles L with a particle size of 3.0 mm.
It can be classified into fine particles S with a particle size of 1.5 mm. In these cases, the coarse particles L are used for sintering, and the fine particles S are used as pellets.

On the other hand, if the moisture content of the granular material M on the belt conveyor 2 is wet, for example, 4% or more, a detection signal from the detector 21 that detects this causes the first motor cylinder 31 and the second motor cylinder to move. Both cylinders 51 are activated automatically.

As a result, the inclined body 6 assumes an upward rotational posture, and when the wet powder M adheres to the bar member 9 with the front and back dimensions of the slit 11 widened, this causes the front and back of the slit 11 to be moved. On the contrary, the dimensions will be optimized. Therefore, the supplied wet powder M is classified at a predetermined classification particle size while falling on the bar member 9.

On the other hand, when each bar member 9 reciprocates,
The deposit M' is removed.

In the above case, for example, the powder M has an average particle size of 2.5 mm.
+3 mm and a ratio of 33% can be classified into coarse particles L with a particle size of 3.7 mm and fine particles S with a particle size of 1.9 mm.

In addition, since each bar member 9 moves relative to the scraping plate 53 when removing the deposit M',
At this time, both scraping plates 53, 53 are worn out. However, if the screw member 55 is removed, both scraping plates 5
3 and 53 can be attached and detached from both side plates 8 and 8, the two scraping plates 53 and 53 can be easily replaced.

(Effects of the Invention) According to the present invention, since the front and rear dimensions of the slit in plan view are made variable to correspond to the moisture content of the powder or granule M detected by the detector, when the powder or granule is in a wet state, It is sufficient to make the width of the slit wider in plan view than in the dry state, and in this way, even if the slit is somewhat clogged with powder or granules, the desired classification efficiency can be maintained. be able to.

Therefore, the desired classification efficiency can be obtained even when the powder or granular material is in a wet state.

Furthermore, since each of the bar members is fitted to the inclined frame so as to be movable in the left and right directions, if the bar members are moved in the left and right directions depending on the clogging of the slits, the attachments attached to these bar members can be removed. The kimono is scraped off by the inclined frame, and the slits are cleaned.

Therefore, the progress of the clogging is suppressed, and the front-back dimension of the slit is maintained at a predetermined value, and in this respect, the desired classification efficiency can also be maintained. Further, since the slits are cleaned by simply moving the bar member left and right, this cleaning work is easily accomplished.

Moreover, since the left and right dimensions of the bar member are more than twice the left and right inner width dimensions of the inclined frame, for example, from a state where approximately the right half of the bar member is positioned within the inclined frame, this can be moved to the right. When the left half is positioned within the slanted frame, the entire left half is cleaned, and the subsequent classification work can be carried out without any trouble.

[Brief explanation of drawings]

The figures show an embodiment of the present invention; FIG. 1 is a perspective view, FIG. 2 is a side view, FIGS. 3 and 4 are partially enlarged views of FIG. 2, and FIG. 5 is a plan view, and FIG. Figure 6 is a partial perspective view of the scraping device, and Figure 7 is a partial perspective view of the scraping device.
It is a line arrow view. DESCRIPTION OF SYMBOLS 1... Classifier, 7... Inclined frame, 9... Bar member, 11... Slit, 21... Detector, M...
Powder, L...coarse particles, S...fine particles.

Claims (1)

[Claims] 1. A slanted frame that slopes forward and downward is provided, and a number of bar members that extend in the left-right direction and are supported at both ends by the slanted frame are provided, and a slit is formed between each of these adjacent bar members, and the slanted frame is In a powder and granule material classification device configured to supply powder and granule to the upper surface of a group of bar members inside the bar member, a detector is provided to detect the moisture content of the powder and granule to be supplied onto the group of bar members. The front and rear dimensions of the slit in plan view are made variable to correspond to the moisture content, and each of the above bar members is fitted to the inclined frame so as to be movable in the left and right direction, and the left and right dimensions of each of the above bar members are made variable. A powder and granular material classification device having a size that is at least twice the left and right inner width dimension of the above-mentioned inclined frame.