JPH0753250B2 - Grinding equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a grinding and pulverizing apparatus for producing granules, and particularly to an apparatus having both a grinding and pulverizing action and a classifying action.

[Conventional technology]

This type of milling and crushing device is called a tower mill, which will be described with reference to FIGS. 1 and 2 in which a vertical screw shaft 13 is provided in a rigid processing cylinder 10.
And a crushing medium b such as a steel ball are provided and the screw shaft 13 is rotated, and the object a is put into the processing cylinder 10 and allowed to flow. The fine production particles c are obtained by grinding with the grinding medium b, and the production particles c are placed on a rising fluid such as air or water passing through the inside of the processing cylinder 10 and led out of the processing cylinder 10. This production particle c
Is sent to a classifier to be supplemented with particles having a required particle size to be a product, and other produced particles c are fed back to a disposal or processing cylinder 10.

In this grinding and pulverizing apparatus, a classification zone by a vertically rising flow is provided above the processing cylinder 10, and thus, Japanese Patent Laid-Open No. 56-1110.
There is one described in Japanese Patent No. 56. The classification zone in this technique improves the sedimentation property of the produced particles c in the zone and enhances the classification efficiency of the coarse particles, thereby increasing the friction pulverization amount to increase the slurry concentration (required diameter The concentration of produced particles c) is improved.

[Problems to be solved by the invention]

Since the technique described in the above publication aims to improve the sedimentation property, the material a or the like to be treated is introduced from above the classification zo. That is, when the object a to be treated is introduced from above the classification tank, the object a to be treated becomes a nucleus of the sedimentation action, and the sedimentation property is improved.

However, when the material to be treated a is charged into the classifying tank, a downward flow is generated, which causes turbulence in the ascending flow, which lowers the original classification efficiency for classifying the product particles c in the ascending flow. . That is, the production particle size c of the required particle size
Even settle. This phenomenon becomes more viscous as the produced particles c have a smaller diameter because the degree to which they are pulled down (settled) by the nuclei increases.

It is an object of the present invention to increase the original classification efficiency of classifying by placing production particles on an ascending flow in a grinding and pulverizing apparatus provided with a classification zone by a vertically ascending flow above the processing cylinder.

[Means for Solving the Problems]

In order to solve the above problems, in the present invention, in the grinding and pulverizing device provided with a classification zone by the conventional vertical upward flow above the processing cylinder, in the classification processing cylinder forming the classification zone, The rectifying means for preventing the swirling flow of the ascending fluid from the processing cylinder is provided, and the workpiece inlet is formed below the cylinder.

The rectifying means has a structure in which a rectifying plate in a vertical direction that is radial with respect to the center of the processing cylinder is provided in the processing cylinder, a structure in which a horizontal porous plate is provided in the processing cylinder, and the rectification plate and the porous plate are used in combination. Configuration, etc.

[Action]

In the grinding and pulverizing apparatus according to the present invention configured as described above, the grinding and crushing action is performed in the processing cylinder, and the classification action is performed in the processing cylinder to obtain the required particle size in the same manner as in the conventional case. The following production particles are derived from the outlet.

At the time of this action, since the object to be treated is loaded from below the processing cylinder, the inside of the processing cylinder above the charging port has a classifying action only by the upward flow. At this time, since the rectifying means is provided, the spiral flow is blocked and the classification efficiency is improved.

〔Example〕

As shown in FIGS. 1 and 2, a cylindrical grinding / grinding processing cylinder 10 is provided in the frame F via a support arm 11 and the like, and a grinding medium b is required in the processing cylinder 10. It is filled up to the height, and when the object b to be processed is charged into the processing cylinder 10 through the charging port 12, the object a and the grinding medium b are moved vertically by the rotation of the screw shaft 13 and stirred (flow). Then, the material to be treated a is pulverized into the production particles c by being pulverized by the mutual grinding and the grinding medium b.

The screw shaft 13 is a hollow shaft, reaches the upper surface of the frame F, penetrates the air box 14 on the upper surface, and is connected to the CAD motor M via a coupling 15 and a bearing 16. Air box 14 has an air inlet
17 is formed, and when air is sent from this inflow port 17, the air is supplied to the screw shaft in the air box 14.
It passes through a through hole (not shown) of 13 to reach the inside of the shaft 13, and jets into the processing cylinder 10 from the lower end thereof. Since the ejection port 18 is located at the center of the processing tube 10, the air is evenly ejected over the entire area of the processing tube 10. The jetted air becomes an upflow in the processing cylinder 10, and the crushed particles (production particles c) are placed on the upflow and rise together. The screw shaft 13
It is preferable that the air ejection port 18 at the lower end of is capable of adjusting the ejection amount by a damper or the like.

On the upper part of the processing cylinder 10, a classification processing cylinder 19 is provided. Inside the processing cylinder 19, there is provided a rectifying plate 20 in the vertical direction that is radial with respect to the center thereof, and in the processing cylinder 10, the upward flow becomes a swirl flow due to the rotation of the screw. When reaching the inside of the processing cylinder 19, the flow straightening plate 20 prevents the spiral flow and makes the flow straight. For this reason, as for the classification action of the produced particles c, only those capable of riding on the air that rises almost straight are discharged from the outlet 21.

Usually, when a centrifugal force acts due to a vortex flow, the classification action is improved, but as the diameter of the desired production particles c becomes smaller, the classification action becomes stronger and even the production particles c having the desired diameter are separated. It becomes difficult to obtain the production particles c having a desired diameter. However, if the swirl flow disappears, the classification is performed depending on whether or not the air flow can be achieved. Therefore, the classification action also becomes gentle and there is no such inconvenience. Therefore, in this embodiment, the outlet port is almost exclusively
The production particle c derived from 21 will be determined.
In this example, the production particles c of several tens to several microns or less could be smoothly produced.

Here, the grinding and crushing zone in the processing cylinder 10 and the charging port 12
The optimal flow velocities in the upper classification zones are typically different, the latter usually slower. For this reason, the cross-sectional area of the processing cylinder 19 is larger than that of the processing cylinder 10, and is appropriately determined by actual operation, experiment, or the like. Further, the length (height) of the processing cylinder 19 is appropriately determined by an actual operation / experiment or the like so as to obtain a residence time in which the above-described upward flow classification can be sufficiently performed. The residence time is usually 1 to 20 seconds in the case of the dry type as in this example, and 0.5 to 10 in the case of the wet type.
It's about a minute.

This embodiment has the above-mentioned configuration. Now, by suctioning air from the take-out port 21, an ascending flow is generated in the processing cylinder 10 and the processing cylinder 19, and the object a is charged from the charging port 12. Then, as in the conventional case, the grinding and crushing action is performed in the treatment cylinder 10, the classification action is performed in the treatment cylinder 19, and the production particles c having the required particle diameter or less are led out from the take-out port 21. .
The derived production particles c are further classified through a classifier and then collected to be a product. The classifier may be removed, and the classified particles are fed back into the processing cylinder 10.

Instead of the flow straightening plate 20 described above, a perforated plate 22 shown in FIG. 4 may be horizontally provided immediately above the inlet 12 as shown by the chain line in FIG. This perforated plate 22 has a plurality of holes for each plate.
The axis of 22a may be shifted, and in that case, a required interval may be provided. The holes 22a may have various shapes such as circles and triangles, and the porous plate 22 may have a honeycomb structure.
It is also possible to use a plate having a lattice structure or the like. The straightening plate 20 and the perforated plate 22 may be used together.

Further, as shown by the chain line in FIGS. 1 and 3, the screw shaft 13 in the processing cylinder 19 is covered with the cylinder 23, and the screw shaft 13
It is advisable not to generate the influence of the rotation on the upward flow, that is, the rotation force.

The charging port 12 may be anywhere below the processing cylinder 19, that is, any position below the position where the residence time for classification can be obtained, for example, the middle of the processing cylinder 10, the lower part, etc. can do.

A plurality of outlets 21 can be provided in the circumferential direction of the processing cylinder 19, and in this case, it is preferable that they are equidistant. In the case of a plurality, the air outflow (outlet) from the processing cylinder 19 becomes uniform in the circumferential direction,
Disturbance of the ascending flow in the processing cylinder 19 due to the deflection derivation is prevented.

The present invention is not limited to the intake as in the embodiment,
Needless to say, the present invention can be applied not only to a type in which compressed air is sent from the air inlet 17 but also to a wet type as well as a dry type.

〔The invention's effect〕

Since the present invention is configured as described above and has no influence on the classification action of the object to be treated, the classification action due to the upward flow is smoothly performed. This ascending flow classification is advantageous for classification of fine particles, and therefore the present invention provides
It is very advantageous for the production of fine particles.

Since the rectifying means is provided in the cylindrical body, the classification action is rectified by the vortex flow and is made smoother, and the efficiency is improved.

[Brief description of drawings]

FIG. 1 is a front view of a main part of an embodiment of a grinding and pulverizing apparatus according to the present invention, FIG. 2 is a right side view of FIG. 1, and FIG. 3 is a sectional view taken along line XX of FIG. FIG. 4 is a perspective view of a perforated plate as a rectifying means of another embodiment. 10 …… Processing tube for grinding and crushing, 11 …… Support arm, 12 …… Injection port for workpiece, 13 …… Screw shaft, 14 …… Air box, 15 …… Coupling, 16 …… Bearing, 17… … Air inlet, 18 …… Air jet, 19 …… Classification processing cylinder, 20 …… Rectifier plate, 21 …… Outlet port, 22 …… Perforated plate, 23 …… Cylinder, F …… Frame, M …… Gard motor, a …… Processing object, b …… Crushing medium, c …… Production particles.

Claims (4)

[Claims] 1. A rigid processing cylinder (10) is provided with a vertical screw shaft (13) and is filled with a grinding medium (b), and the object (a) is put into the processing cylinder (10) while the screw shaft (13) is being rotated. And finely pulverize the object a to be treated between them and with the crushing medium b, and the fine particles c are placed on the ascending fluid in the processing cylinder 10 to generate the particles c outside the processing cylinder 10. In the milling and pulverizing apparatus led to the above, in the above-mentioned processing cylinder 10, a classification processing cylinder 19 by vertical upward flow is provided.
Are continuously provided, and the produced particles c are provided on the upper part of the processing cylinder 19.
Of the processing cylinder 19 is formed below the processing cylinder 19 and the processing cylinder 19 is provided with an inlet 12 for the object to be processed a.
A grinding and crushing device, characterized in that a rectifying means for preventing a swirling flow of the ascending fluid from the processing cylinder (10) is provided in the inside (19). 2. A grinding and crushing apparatus according to claim 1, wherein said rectifying means comprises a vertical rectifying plate 20 radially arranged with respect to the center of the processing cylinder 19 in the processing cylinder. . 3. The straightening means is constituted by providing a horizontal perforated plate 22 in the processing cylinder 19 (1).
The grinding and crushing device described. 4. The grinding mill according to claim 1, wherein the rectifying means is configured by using the rectifying plate 20 according to claim (2) and the perforated plate 22 according to claim (3) together. apparatus.