JPWO2008126154A1 - Mineral sorting method and sorting apparatus - Google Patents

Abstract

[PROBLEMS] To smoothly sort crushed minerals into a large number of sizes using a compact means. [Solution] A blower means such as a blower fan 3 for separating the input mineral 12 by wind power and a fallen mineral are selected, and the mineral 12 having a certain size or larger is selected and passed through the mineral 12 having a certain size or smaller. A sorting screen 11 is installed. The mineral 12 is blown off by the blowing means, the position where it falls according to the size is changed, the sorting screen 11 is smoothly transmitted, and the sorting means can be made compact.

Description

  The present invention relates to a sorting method for dividing a mineral into a plurality of stages according to its size and an apparatus used therefor.

  Minerals were crushed with a centrifugal crusher to make crushed stones, sorted according to their size, and supplied according to their demand, such as roadbed materials and concrete aggregates.

The applicant of the present application has developed an apparatus described in Japanese Patent Laid-Open No. 2003-175367 as an apparatus for sorting. The sorting device sorts the object to be sorted (crushed stone) that is blown by the wind of the blower using a distance that varies depending on its size (weight).
This is called wind separation.
Under the space to be blown, two screw conveyors that transport minerals are installed at different distances from the blower, and the crushed stones that have fallen are collected on this conveyor and divided into two stages depending on the distance traveled. It is.

  In addition, as another conventional means for sorting minerals, sorting screens having different sieve mesh sizes (mesh dimensions) are arranged up and down in descending order of sieve mesh size, and various sizes are arranged on the screens. A method is also employed in which minerals are dropped at once, a mineral having a size smaller than the sieve mesh is dropped on a screen below the screen, and sieved in order to select a plurality of sizes.

However, when a large number of types of minerals are dropped at the same place at a time, the size of the screening screen for sieving is long because minerals of a size smaller than the sieve mesh roll over the mineral larger than the sieve mesh. In order to be able to roll the distance and ensure sorting, the screen had to be long and wide.
In other words, such a sorting apparatus is very large.
JP 2003-175367 A

  The problem to be solved by the present invention is to solve the problem that the blown-off mineral (crushed stone) could not be efficiently sorted out by a compact means.

The screening method according to the present invention includes:
Air blowing means for separating the input minerals by wind,
In the method of sorting minerals, which has fallen minerals, sorts out minerals of a certain size or larger, and has sorting means for passing minerals of a certain size or smaller,
By blowing means, fly a smaller diameter mineral farther away,
Drop a relatively limited range of size minerals onto the sorting means,
Each sorter sorts minerals of a certain range of sizes.
The mineral sorting apparatus according to the present invention is:
A mineral sorting device that separates the mineral to be sorted by wind and sorts the size of the mineral,
It has a dust collector that collects dust from the space where minerals are separated by wind,
A sorting screen is disposed under a space for separating minerals by wind.
In addition, the mineral sorting apparatus according to the present invention includes:
A mineral sorting device that separates the mineral to be sorted by wind and sorts the size of the mineral,
It has a dust collector that collects dust from the space where minerals are separated by wind,
Under the space where minerals are separated by wind, a sorting screen is installed,
The end of the sorting screen is extended to the position where the mineral to be sorted jumps.
Furthermore, the mineral sorting apparatus according to the present invention includes:
A recovery port that does not have a sorting screen is formed further behind the end of the sorting screen.
Furthermore, the mineral sorting apparatus according to the present invention includes:
In the sorting screen, the minerals to be sorted fly to the position where
An intermediate damper for distributing minerals is provided.

The mineral sorting method and the sorting apparatus used therefor according to the present invention can obtain the following effects by the above configuration.
<a> Minerals already blown by air blow and separated by size, minerals of almost the same size fall on the surface of a certain range of the sorting means, so when passing through the sorting screen, long distances involving larger minerals It will not roll and will pass smoothly through the mesh (screen), eliminating the need for a large (long) size sorting screen and making the sorting device itself compact.
By providing the <b> dust collector, dust can be collected separately from the sorting screen, and the sorting operation of other minerals can be remarkably facilitated. In other words, fine minerals do not adhere to the mesh (mesh) of the sorting screen, the opening of the mesh is not narrowed, and the sorting operation is not hindered.
<C> Minerals fall to different positions of the sorting means at different sizes, so large-sized minerals do not fall, and fine screen damage is reduced.
<D> By setting the end of each sorting screen to a position where the sorting object to be sorted reaches, the small sorting object that has traveled farther has a small sieve size to be sorted directly. Since it falls onto the sorting screen, it does not occur that it hits the sorting screen having a large mesh size located above several times to prevent smooth fall.
<E> By providing a recovery port that does not have a sorting screen in the back of the sorting screen, fine minerals do not pass through the sorting screen, so the screen performance is further improved.
<F> The sorting screen is provided with an intermediate damper that sorts the mineral at a position where the mineral of the size to be sorted jumps, so that the sorting position can be adjusted according to the scattering state of the mineral.

  In the present invention, the mineral is separated by wind and dropped onto the surface of a certain range of the sorting means, whereby the passing through the sorting screen is made smooth and a compact sorting means is obtained.

<1> Housing FIG. 1 shows a first embodiment of the present invention, wherein the housing housing 1 of the entire apparatus has its upper and lower intermediate side walls connected by upper and lower bellows 1a, and vibration of a vibrator or the like. Is a fluid A that is transmitted.
The fluid A as the sorting means has a plurality of sorting screens 11 to be described later, and these sorting screens 11 vibrate when the vibration of the vibrator is transmitted.
On the upper side of the housing 1, an air outlet 2 is opened. From the blower opening 2, the blower of the blower fan 3, which is a blower, is sent to the mineral sorting space 4 of the housing case 1. In the vicinity of the air blowing port 2, a mineral charging port 5 is opened immediately above.

<2> Dust Collector A dust collector 9 is installed at the upper part of the housing 1 and on the side opposite to the air blowing port 2.
The dust collector 9 has a dust collection port 10 toward the mineral sorting space 4, and fine minerals can be collected by the suction force of the dust collector 9.

<3> Sorting Screen Below the mineral sorting space 4 of the housing housing 1, a plurality of sorting screens 11 having a large number of sieves as sorting means are arranged in a stacked manner.
As the sorting screen 11 goes from top to bottom, the size of the mesh (mesh size) becomes smaller according to the grade to be sorted.
A partition wall 14 is provided at the air outlet 2 side end of each sorting screen 11, and a separate discharge port 15 is formed for each sorting screen 11.

A method for sorting minerals using the sorting apparatus as described above will be sequentially described below.
<4> Blow-off operation Mineral 12 is charged into the apparatus through the mineral inlet 5.
The mineral 12 that has fallen is blown off by the air blown from the blower fan 3.
Larger and heavier minerals 12 do not fly far away. Conversely, the smaller and lighter mineral 12 will fly farther by blowing air.
In other words, the mineral 12 is separated by a certain range of sizes by wind power, which is called wind separation in the present invention.

<5> Sorting operation The sorting screen 11 is a net-like member, and the size of the sieve mesh to be sieved is stacked up and down in order from the largest, and the mineral 12 having a size smaller than the sieve mesh size is the screen. Pass through 11 and fall below.
In FIG. 1, four screens 11a to 11d are arranged from a screen 11d having a mesh size of 20 mm to screens 11c and 11b and further to the lowermost screen 11a in the order of 13 mm, 5 mm, and 3 mm. It is set up.
The smallest and lightest size mineral 12a is blown to the farthest, passes through all the screening screens 11d to 11a, falls down, and is discharged from the discharge port 15a.
The larger size (grade) mineral 12b passes through the screens 11d, 11c and 11b, falls on the screen 11a, rolls on the screen 11a, and is discharged from the discharge port 15b.
Similarly, the larger size (grade) minerals 12c and 12d fall on the screens 11c and 11d, respectively, and are discharged from the outlets 15c and 15d of that grade.
The largest size mineral 12e does not pass through the screens 11a to 11d, rolls on the screen d, and is discharged from the discharge port 15e.
In the present invention, the position where the mineral 12 falls in a certain range falls within a certain range on the surface of the sorting screen 11 by separating the minerals according to the size of the mineral by wind force and the sorting screen 11. This prevents the material from falling so as to be entangled with the mineral and significantly improves the sorting ability of the sorting screen 11.
In other words, it is not only a combination of sorting by wind power and a sorting screen, but also by combining both, the sorting by the sorting screen can be performed smoothly, and the length and width of the sorting screen 11 can be made compact. To achieve an effect.

<6> Dust Collection Work Minerals in a very fine dust state are collected from the mineral sorting space 4 through the dust collection port 10 by the operation of the dust collector 9.
Thus, in the sorting apparatus of FIG. 1, the mineral 12 is sorted into six stages.
In the embodiment shown in the figure, a plurality of sorting screens 11 are provided. However, if the dust collector 9 and the recovery port 17 are combined, even one sorting screen 11 can be sorted into four sizes of minerals 12.
That is, a plurality of sorting screens 11 are not necessarily required.

FIG. 2 shows a second embodiment of the present invention, in which the rearmost part of the housing housing 1 away from the blower opening 2 does not have a sorting screen, but falls below and is collected. A recovery port 17 is provided.
A rear damper 19 capable of changing the inclination angle is attached to the uppermost end of the partition wall 18 forming the recovery port 17.
If there is a slight difference in the flight distance depending on the type of mineral, the angle of the rear damper 19 can be changed in accordance with the flight distance, so that it can be more accurately selected from the smaller mineral 12.
From this collection port 17, the small-sized mineral 12 that has flew farthest is discharged and collected.
As described above, the mineral 12 having the minimum diameter can be collected without passing through the sorting screen, and the sorting efficiency can be increased by eliminating as much as possible the matter that hinders sorting.
In the middle of the partition wall 18, a damper 21 that can be inclined toward the collection port 17 is provided. When the mineral 12 that has flown farther than the partition wall 18 is discharged to the discharge port 15a side and mixed with the mineral 12a that has passed through the sorting screen 11a, the damper 21 is brought down to the recovery port 17 side and moved to the discharge port 15a side. Discharge.

FIG. 3 shows a third embodiment of the present invention in which the end of each sorting screen 11 on the side away from the air blowing port 2 falls on the longest reach of the mineral 12 to be sorted. As far as the position.
The flying distance of the mineral 12 is changed according to the size of the mineral 12 together with the performance of the blower fan 3, and it is obtained in advance as experimental data.
By this experiment, each sorting screen 11a-d can determine the distance over which the minerals 12a-d of the size collected by sieving by the sorting screen 11a-d fly.
Each of the sorting screens 11a to 11d in the third embodiment preferably extends the distal end portion away from the air blowing port 2 to the full distance (longest reach position) determined by experiments, and less than that. It will not stretch until the mineral 12 of the size flies.
As a result, most of the skipped mineral 12 falls almost accurately onto the screen 11 to be sorted without passing through the screen 11 from which the mineral of a larger size is sorted.

1 and 2 showing the first and second embodiments described above, even if the mineral has a smaller diameter than the size of the sieve mesh, It may be repelled in the foreground. When repelled, it stays on the screen with larger sized minerals and does not pass smoothly through the screen.
In the embodiment shown in FIG. 3, the mineral 12 does not fall on the screen 11 which sorts out larger sizes, but directly falls on the screen 11 which sorts out the size.
Therefore, the passage of the screen 11 of the mineral 12 having a smaller size is smooth without being prevented from being dropped by the screen 11 having a larger mesh size.

FIG. 4 shows a fourth embodiment of the present invention. As in the third embodiment, the screen 12 is arranged so that the mineral 12 having a size to be sieved reaches the tip of the sorting screen 11. An intermediate damper 20 is attached to the tip of 11 so that the inclination angle can be changed.
When the flying distance changes slightly depending on the type of the mineral 12, the angle of the intermediate damper 20 is changed, and the boundary position of the selection is adjusted according to the position to which the jump is made, thereby enabling more accurate selection.
Further, in the embodiment of FIG. 4, a collection port 17 that does not have a sorting screen is provided further behind the sorting screen 11.
Such an intermediate damper 20 can also be implemented in the embodiment shown in FIGS. 1 and 2, and the intermediate damper 20 is selected not at the tip of each sorting screen 11 but at a position where the mineral 12 to be sorted reaches. It is provided in the middle of the screen 11.

It is explanatory drawing of the 1st Example of the sorting device concerning this invention. It is explanatory drawing of the 2nd Example which provided the discharge port in the innermost part. It is explanatory drawing of the 3rd Example which made the mineral which should be sorted reach the edge part of a sorting screen. It is explanatory drawing of 4th Example which made the mineral which should be sorted reach the edge part of a selection screen, and provided the intermediate damper in the edge part.

Explanation of symbols

A: Fluic 1: Housing 2: Blower port 3: Blower fan 4: Sorting space 5: Input port 9: Dust collector 11: Sorting screen 12: Mineral 15: Discharge port 17: Recovery port

[0006]
The largest-sized mineral 12e does not pass through the screens 11a to 11d, rolls on the screen d, and is discharged from the discharge port 15e.
In the present invention, the position where the mineral 12 falls in a certain range falls within a certain range on the surface of the sorting screen 11 by separating the minerals according to the size of the mineral by wind power and the sorting screen 11. This prevents the falling so as to be entangled with the mineral, and the sorting ability by the sorting screen 11 is remarkably improved.
In other words, it is not only a combination of sorting by wind power and a sorting screen, but also by combining both, the sorting by the sorting screen can be performed smoothly, and the length and width of the sorting screen 11 can be made compact. To achieve an effect.
[0015]
<6> Dust Collection Work Minerals in a very fine dust state are collected from the mineral sorting space 4 through the dust collection port 10 by the operation of the collecting device 9.
Thus, in the sorting apparatus of FIG. 1, the mineral 12 is sorted into six stages.
In the embodiment shown in the figure, a plurality of sorting screens 11 are provided. However, if the dust collector 9 and the recovery port 17 are combined, even one sorting screen 11 can be sorted into four sizes of minerals 12.
Example 2
[0016]
FIG. 2 shows a second embodiment of the present invention, in which the rearmost part of the housing housing 1 away from the blower opening 2 does not have a sorting screen, but falls below and is collected. A recovery port 17 is provided.
A rear damper 19 capable of changing the inclination angle is attached to the uppermost end of the partition wall 18 forming the recovery port 17.
If there is a slight difference in the flight distance depending on the type of mineral, the angle of the rear damper 19 is changed according to the flight distance, and the selection with the smaller mineral 12 is more effective.

Claims (5)

Air blowing means for separating the input minerals by wind,
In the method of sorting minerals, which has fallen minerals, sorts out minerals of a certain size or larger, and has sorting means for passing minerals of a certain size or smaller,
By blowing means, fly a smaller diameter mineral farther away,
Drop a relatively limited range of size minerals onto the sorting means,
Sorting a range of sizes of minerals by sorting means;
A method for sorting minerals. A mineral sorting device that separates the mineral to be sorted by wind and sorts the size of the mineral,
It has a dust collector that collects dust from the space where minerals are separated by wind,
The sorting screen was placed under the space where the minerals were separated by wind,
Mineral sorting device characterized by. A mineral sorting device that separates the mineral to be sorted by wind and sorts the size of the mineral,
It has a dust collector that collects dust from the space where minerals are separated by wind,
Under the space where minerals are separated by wind, a sorting screen is installed,
The end of the sorting screen was to the position where the mineral to be sorted flew,
Mineral sorting device characterized by. A mineral sorting device according to claim 2 or 3,
Forming a collection port that does not have a sorting screen deeper than the end of the sorting screen,
Mineral sorting device characterized by. A mineral sorting apparatus according to claim 2, 3 or 4,
In the sorting screen, the mineral to be sorted will fly to the position where
An intermediate damper to distribute minerals,
Mineral sorting device characterized by.

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