JPH0233905Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a powder separation device that separates powder such as sand according to particle size.

[Prior Art] Devices for separating powder according to particle size include sieves, vibrating feeders, rotary separators, cyclones, etc., and each has been used depending on the purpose.

[Problem that the invention attempts to solve]

However, when the conventional separation device as described above is used, the following problems occur.

When using a sieve, a mesh screen of various types is used depending on the purpose, but fine powder particles adhere to the mesh, causing clogging, which is troublesome to dispose of. The amount that can be processed per unit time is small.

In addition, when using a vibrating feeder, a device is required to swing the casing containing the powder at a predetermined pitch, which makes the structure complex and large, and requires measures against dust. ,
Equipment costs are high and the amount of processing per unit time is small.

In addition, in a separation device using a rotating separator,
The separator must be suspended from above inside the tank, making the structure complicated.

Furthermore, when a cyclone is used, all the powder to be treated needs to be dispersed in an air stream, making the device large and expensive, making it unsuitable for separating inexpensive powders such as sand.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention includes an outer container that is sealed between the inner container and has a discharge port for the powder with small particle size and air at the lower part;
An inner container is disposed inside the outer container and forms a powder and air passage leading to the discharge port together with the outer container, and has an open upper part and communicates with the passage. The distribution plate, which is made of a ventilated perforated plate equipped with a mesh to prevent falling, is rotated between a horizontal position across the inner container and an inclined position around a horizontal axis located approximately in the center of the inner container. An air supply port is provided in the inner container below the dispersion plate, an inlet for powder is provided above the dispersion plate of the inner container, and an outlet for large particle size powder is provided in the lower part of the inner container. established,
The dispersion plate is located in a horizontal state during the separation action by air, and when the separation action is completed, it is rotated and tilted so that the large particle size powder remaining on the dispersion plate falls to the lower part.

[Effect]

With the above-mentioned configuration, the rotatable dispersion plate equipped with a net is set in a horizontal state across the inner container during dispersion processing (during separation by air), and a predetermined amount of Powder is introduced and placed. At this time, the powder placed on the dispersion plate is prevented from falling downward by the net. and,
When air is supplied from the bottom of the distribution plate, the air passes through the openings of the distribution plate and the holes in the distribution plate, which is made of a perforated plate, and is dispersed. The following powders are blown up with air inside the inner container to perform a separation action. The upwardly scattered powder passes through the upper opening of the inner container together with air, enters and passes through the passage between the inner container and the outer container, and is discharged through the outlet at the bottom of the outer container.

Further, when the separation action is completed, the powder having a predetermined particle size or more that is not scattered on the dispersion plate and remains is dropped to the lower part of the inner container by rotating and tilting the dispersion plate. taken out.

Therefore, since the dispersion plate itself performs both the action of separating small particles by air and the action of discharging large particles by its rotational action, the The power is reduced and the device is configured compactly. Furthermore, since the dispersion plate rotates about a rotation shaft located in the center of the inner container, the radius of rotation can be kept small, and from this point of view as well, the apparatus can be made smaller.

When starting the powder separation action, the powder placed on the dispersion plate will not fall downward due to the action of the net, and the amount of powder dispersed on the dispersion plate can be adjusted by simply adjusting the amount of air. Since the particle size distribution can be varied, a powder having the desired particle size distribution can be obtained reliably and easily.

〔Example〕

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

FIG. 1 illustrates an embodiment of the present invention.
FIG. 1 shows the schematic structure of the device.

The powder separation device according to the present invention is composed of an outer container 1 and an inner container 2.

The outer container 1 is configured as a sealed casing, and its bottom surface is a bottom plate 3 that surrounds the inner container 2 and forms a slope, and the lowest part of the bottom plate 3 contains powder with small particle size and air. A discharge port 4 is formed.

Further, a ring-shaped air supply pipe 5 is arranged around the outer container 1.
A plurality of air blowing nozzles 6 are provided toward the inside of the external container 1.

On the other hand, the inner container 2 is arranged concentrically within the outer container 1 and has an open upper end.

In addition, a dispersion plate 8 which is rotatable about a shaft 7 which is horizontally suspended is located approximately in the center of the inner container 2.
is provided.

The distribution plate 8 is formed as a perforated plate having a large number of through holes through which air can circulate, and its outer diameter is approximately equal to the inner diameter of the inner container 2.

Furthermore, a net 9 is provided below the dispersion plate 8 to prevent the powder from falling.

The dispersion plate 8 can be changed from a horizontal state across the inner container 2, as shown by a solid line in FIG. 1, to an inclined state by rotating it, as shown by a chain line.

A powder inlet 10 is provided on the side of the internal container 2 and above the dispersion plate 8, and a valve 11 is provided in the middle of the inlet 10.

The lower end of the inner container 2 is a constricted part 2a, and a rotary valve 1 is installed at the lower end of this constricted part 2a.
A second class sealing valve is provided.

Further, below the distribution plate 8, an air supply port 13 is provided on the side surface of the inner container 2, which can supply an air flow having a predetermined superficial velocity.

Next, the operation of this embodiment configured as above will be explained.

First, set the dispersion plate 8 in a horizontal position, and then open the valve 1.
1 is opened, a predetermined amount of powder is supplied onto the dispersion plate 8 from the powder inlet 10, and the valve 11 is closed.

At this time, the amount of powder introduced is such that it reaches the vicinity of the connection between the input port 10 and the inner container 2, as shown by the dotted line in FIG.

In this state, an air flow having a predetermined superficial velocity is sent from the air supply port 13 located below the distribution plate 8.

This air flow passes through the mesh of the net 9, passes through the small holes of the distribution plate 8 having a perforated plate structure, and blows up powder such as sand that is being supplied onto the distribution plate.

That is, the powder is brought into a fluid state by the air flow,
It depends on the particle size, mass and superficial velocity, but
Powder with a small diameter and small mass is scattered by the air flow, rises with the air flow, is ejected into the outer container 1 from the opening at the upper end of the inner container 2, and exits from the outlet 4 at the bottom of the outer container 1. The powder is extracted and captured by a collector (not shown).

At this time, an air stream is ejected from the nozzle 6 into the outer container 1 and is blown onto the inclined bottom plate 3 and the inner wall of the outer container 1, thereby preventing powder from adhering to the bottom plate 3 and the inner wall of the container. Residue is prevented.

After supplying the air flow for a predetermined time in this way and scattering the powder with a small diameter and small mass, the supply port 13
The distribution plate 8 is rotated and tilted as shown by the chain line in FIG. 1.

As a result, the large-diameter, large-mass powder remaining on the dispersion plate 8 without being scattered is collected in the constricted portion 2a at the bottom of the inner container 2, taken out from the rotary valve 12 to the outside, and collected.

In this way, one separation operation is completed.

Thereafter, by repeating the same operation, the separation of the powder is performed sequentially in batches.

Here, FIG. 2 shows the results of a powder separation test conducted using the separation apparatus of the present invention.

In Figure 2, the curve indicated by symbol A indicates the particle size distribution of the sand used, and the curve B indicates the superficial velocity of 7.3 m/
The particle size distribution of the scattered sand in case of s is shown. Also,
Curves C and D have a superficial velocity of 9.3 m/s and
The particle size distribution of the scattered sand is shown in the case of 13.1m/s.

As is clear from Figure 2, sand with a larger particle size is obtained as the superficial velocity is increased, and sand with the desired particle size can be obtained by adjusting the superficial velocity to the desired speed. This was confirmed. In addition, when the separation device of the present invention is used, powder with a small particle size is scattered upward from the dispersion plate 8 and obtained from the discharge port 4, and powder that remains on the dispersion plate 8 and is discharged from the rotary valve 12 is obtained. Powders having various particle size distributions can also be obtained by mixing powders with large particle sizes at various mixing ratios.

[Effect of idea]

As is clear from the above explanation, since the present invention has the structure described in the claims of the utility model registration, it is possible to reliably and easily produce powder with a desired particle size composition even with a simple and compact device. At the same time, a large amount of powder can be separated efficiently and easily.

In addition, since the powder separation action does not require large-sized powder to be conveyed in an air flow, the amount of air can be reduced, and the power required for air conveyance can also be reduced. In addition, since the device is sealed, no dust escapes and there is no pollution.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional side view of a separation device illustrating an embodiment of the present invention, and Fig. 2 is a diagram showing the results of a sand separation test, showing the particle size distribution of the sand used and at various superficial velocities. It is a diagram showing the particle size distribution of scattered sand. 1... External container, 2... Inner container, 4... Discharge port, 5... Pipe, 6... Nozzle, 7... Shaft, 8
... Dispersion plate, 9 ... Net, 10 ... Powder inlet, 1
1... Valve, 12... Rotary valve, 13... Air supply port.

Claims (1)

[Scope of utility model registration request] an outer container that is sealed between itself and the inner container and has a discharge port for powder with a small particle size and air at the bottom thereof; and a passage for the powder and air that is arranged inside the outer container and communicates with the outer container to the discharge port. and an inner container having an open upper part and communicating with the passage, and within the inner container, a dispersion plate made of a perforated plate that can be ventilated and equipped with a mesh to prevent falling of powder is placed across the inner container. An air supply port is provided in the inner container below the dispersion plate, and an air supply port is provided in the inner container below the dispersion plate. An inlet for powder is provided on the upper side of the dispersing plate, and an outlet for discharging powder with a large particle size is provided at the lower part of the inner container, and the dispersing plate is located in a horizontal state during the separation action by air. 1. A powder separation device characterized in that when the dispersion plate is rotated and tilted, the large particle size powder remaining on the dispersion plate is dropped to the lower part.