KR19990068297A - Continuous horizontal classifier for metal powder - Google Patents

Abstract

The present invention relates to a horizontal classifier used in the sedimentation fractionation method, the triangular shape having a predetermined interval at the bottom of the classification tube in order to distribute the sediment together with the classification liquid in the classification tube according to the sedimentation rate It is characterized in that a plurality of installment jaw, it is possible to prevent the performance degradation of the classifier and to improve the work efficiency.

Description

Continuous Horizontal Classifier for Metal Powders {CONTINUOUS HORIZONTAL CLASSIFIER FOR METAL POWDER}

The present invention relates to a horizontal classifier used in the sedimentation fractionation method, and more particularly, to a continuous horizontal classifier for metal powder, which focuses on improving the structure of the classifier jaw to prevent performance degradation of the classifier and enhancing work efficiency.

Generally, the classifier which classifies by sedimentation classification method uses different sedimentation time according to particle size. That is, the powder having a large particle size has a short settling time, and the powder having a small particle size has a long settling period. In order to achieve this, a horizontal fluid is used. That is, the fluid flows horizontally to the powder which is settled vertically, converts it into time difference of sedimentation, and classifies it. It is therefore called horizontal classifier.

Horizontal classifiers can be called continuous horizontal classifiers because they can be classified continuously in theory. 1 is a schematic diagram of a conventional horizontal classifier.

Actually, when the horizontal classifier is operated, the nickel that is classified is precipitated while showing the flow as shown in FIG. 2 in the classification pipe 50, and the nickel deposited on the classification jaw 54 remains without being discharged to the valve.

By the way, nickel powder precipitates and accumulates in the classifier jaw for a long time, which in turn hinders the fluid flow in the classifier, thereby degrading the performance of the classifier.

Therefore, it is necessary to remove nickel from the classifier. This disassembly blocks the continuity of the continuous horizontal classifier, reducing the working efficiency in classifying a large amount of powder.

Reference numeral 60 denotes a classification liquid tank, 62 a fine adjustment valve, 70 a slurry tank, and 72 a slurry inlet.

Accordingly, the present invention is to solve the problems of the prior art as described above, to improve the structure of the classing jaw to provide a continuous horizontal classifier for the metal powder with the focus on preventing the performance degradation of the classifier and improving the work efficiency. There is a purpose.

Specific means of the present invention for achieving the above object,

When the sediment flows along with the classification liquid into the classification pipe, it is characterized in that a plurality of triangular shaped jaw are installed at the bottom of the classification pipe at a predetermined interval in order to distribute it to various groups according to the sedimentation rate.

1 is a block diagram of a conventional horizontal classifier,

2 is a flow chart of the case of using a conventional horizontal classifier,

3 is a block diagram of a horizontal classifier according to the present invention,

Figure 4 is a flow chart when using a horizontal classifier of the present invention.

<Explanation of symbols for the main parts of the drawings>

50: classification pipe 52: classification jaw

60: classification liquid tank 62: fine adjustment valve

70 slurry tank 72 slurry receiving stand

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention;

Figure 3 is a block diagram of a horizontal classifier according to the present invention, Figure 4 is a flow chart when using the horizontal classifier of the present invention.

As shown in FIG. 3, the present invention has a triangular-shaped powder having a predetermined interval at the bottom of the classification pipe to distribute the sediment together with the classification liquid into the classification pipe 50, according to the sedimentation rate. A plurality of gold jaw 52 is installed.

According to the present invention configured as described above, the liquid flows from the classification liquid tank 60 through the fine adjustment valve 62 and into the classification pipe 50 through the fine pipe stop 64 of the classification pipe 50 side, as shown in FIG. 4. do. At this time, the nickel slurry flows in the front side of the microtube stop 64 in the distribution pipe 50 along the water inlet 72 at the nickel slurry tank 70 side.

Therefore, the nickel slurry passes through the plurality of classification jaws 52 by the horizontal flow of the liquid.

At this time, when looking at the flow passing through each triangular classification jaw 52, the upper half of the vortex occurs as shown in Figure 4, but the overall fluid flow flows along the slope from the lower portion of the upper classification jaw 52 to the valve.

This can be seen that when the triangular classification jaw 52 is used, the classification jaw 52 can flow down to the valve without accumulating nickel on the classification jaw while exerting performance.

Therefore, according to the present invention, even in a long time use as in the prior art, the flow of fluid flows down the slope, so that the nickel powder is precipitated on the classification jaw 52 so that the classification performance is not deteriorated.

Table 1 below is a chart showing the calculation and experimental values of the partial particle size of the nickel powder when using the conventional rectangular classification jaw and triangular classification jaw as the classification jaw.

TABLE 1

Output position Calculative Mean Size (㎛) Experimental Mean Size (㎛) STD Deviation (㎛) Discrepancy degree Rectangular Classifier One 7.0 6.43 2.80 -7% 2 5.0 5.24 2.12 5% 3 3.2 5.16 2.10 61% 4 2.0 4.89 2.18 145% Triangular classifier One 6.3 6.66 3.09 6% 2 4.7 6.17 2.65 31% 3 3.2 5.74 2.64 73% 4 2.0 5.11 2.25 156%

As shown in Table 1, there was no difference in classification performance according to the geometric shapes of the triangular classification jaw and the square classification jaw.

When the nickel powder of 11.4 µm was classified using a continuous horizontal classifier equipped with a triangular classification jaw, nickel powders having an average particle size of 5.11 µm, 5.74 µm, 6.17 µm and 6.66 µm were obtained from the respective valves. Even if used for a long time, nickel powder does not accumulate on the classification jaw, so it can be continuously worked.

As described above, according to the present invention, by improving the triangular geometry of the classifier jaw installed at the bottom of the classifier pipe, the work efficiency is increased by preventing the accumulation of sediment on the classifier jaw. There is an advantage that does not have to be done.

Claims (1)

For the metal powder, characterized in that a plurality of triangular sieves are installed at a predetermined interval in the bottom of the classification pipe to distribute the sediment together with the classification liquid into the classification pipe in order to distribute them to various groups according to the sedimentation rate. Continuous horizontal classifier.