JPS63158140A - Mill - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a casing forming a grinding chamber that is rotatable around a vertical axis, and the material to be ground inside the casing is rotated by centrifugal force. A drive device for rotating at high speed so as to be pressed against the inner circumferential surface of the casing is provided, a grinding piece is provided in the casing so as to be rotatable relative to the inner circumferential surface of the casing, and a grinding material discharge port is provided at the upper end side of the casing. and an air supply device for supplying a gas for transporting the ground material inside the casing, a classifier is connected to the discharge port, and a coarse powder return path is provided from the classifier to the casing. Regarding crushers.

[Conventional technology]

Conventionally, as shown in FIG. 10, the casing (4) and the crushed pieces (9) are placed inside the cover (42).
The classifier (A) is connected to the ground material airflow conveying channel (43), and the ground material from the outlet (11) of the grinding chamber (3) is connected to the classifier (A) through the air supply device (18). ), and the coarse powder return path (44) from the classifier (A) is connected to the inner bottom of the casing (4) to transport the material to be ground from the feeder (19) for supplying the material to be ground. It was connected to the central supply path (45) (see, for example, Japanese Unexamined Patent Publication No. 153544/1983).

[Problem that the invention seeks to solve]

However, in the above-mentioned conventional technology, the casing (4) and the classifier (A) are
3) is connected to the coarse powder return path (44), which increases the size of the equipment. ,feeder(
Since the grinding material is mixed with the large material to be ground from No. 19) and supplied to the grinding chamber (3), the grinding efficiency for the coarse powder from the classifier (A) is somewhat inferior, and there is room for further improvement.

An object of the present invention is to improve the equipment so that it can be miniaturized and the efficiency of grinding coarse powder from a classifier can be improved.

[Means for solving problems]

A characteristic configuration of the present invention is that a classifier is directly connected to a casing forming a grinding chamber, and a starting end portion of a coarse powder return path from the classification chamber is placed on the outer periphery of a grinding material discharge port formed at the upper end of the casing. A ring is formed in the casing with a cylindrical partition wall defining a partition, and a ring in which the terminal end side portion of the coarse powder return path is connected to the starting end side portion and the discharge port faces toward the inner circumferential surface of the casing. The structure of the partition wall is provided so as to be freely driven and rotatable around the vertical center, and its functions and effects are as follows.

[For production]

In other words, the classifier is connected directly to the casing, and the ground material is air-flow conveyed from the discharge port of the grinding chamber to the classifier without external piping, and a coarse powder return path is provided on the outer periphery of the discharge port with a cylindrical partition wall. The structure is such that the coarse powder falling in the classifier can be returned to the grinding chamber without external piping, so the classifier described above can be connected to the grinding chamber with two external piping Compared to the conventional connected technology, the entire equipment can now be made sufficiently smaller.

In addition, the coarse powder falling from the starting end of the coarse powder return path is stopped by the ring-shaped partition wall, and the coarse powder is returned toward the inner peripheral surface of the casing by the centrifugal force generated by the drive rotation of the ring-shaped partition wall. Since it is configured so that it can be discharged from the discharge port at the end of the path, the coarse powder from the classifier is not mixed with the large material to be ground that is newly fed into the casing, and the ground pieces are separated. can be immediately sent to the inner circumferential surface of the casing to be ground, and if it is refined by re-grinding, it can be air-flown again to the classifier without being unnecessarily retained in the grinding chamber, allowing for efficient re-grinding. It can be pulverized and recovered by crushing.

〔Effect of the invention〕

As a result, it has become possible to provide a grinder that is small and convenient in terms of installation, has excellent grinding efficiency, and has extremely excellent overall performance and equipment economy.

〔Example〕

Next, an embodiment will be explained with reference to FIGS. 1 to 5.

A bottomed cylindrical casing (4) forming a grinding chamber (3) at the upper end of a vertical rotating cylinder shaft (2) attached to a base (1).
are mounted concentrically, and a drive device (5) consisting of an electric motor (5a), a transmission (5b), etc. is attached to a rotating cylinder shaft (2).
), the casing (4) is configured to drive and rotate so that the material to be ground inside the material to be ground is pressed against the inner peripheral surface (4a) of the casing by centrifugal force; The rotation speed of the casing (4) is configured to be adjustable so that an appropriate centrifugal force can be obtained depending on the properties.

A vertical rotating shaft (6) attached to the base (1) is arranged so as to pass concentrically through the rotating cylinder shaft (2), and a disk (7) is attached to the upper end of the rotating shaft (6). ) are attached concentrically, and a holed circle i (8) is placed concentrically above the disk (7).
A support member (8) is attached with a large number of blades (10), and a grinding piece (9) for crushing the material to be ground in cooperation with the inner circumferential surface (4a) of the casing is fixed to a disc with holes (8). 8a)
The casing (4) is placed in the grinding chamber (3) and
The grinding piece (9) is provided with an inclined surface formed such that the gap between the grinding piece (9) and the casing (4) becomes narrower on the side in the direction of rotation of the casing (4). ) is interlocked with the lower end of the rotating shaft (6) to drive and rotate the grinding pieces (9) in the same direction and relative rotation to the inner circumferential surface (4a) of the casing. The inner peripheral surface of the casing (4
The rotating speed of the grinding piece (9) can be adjusted so as to rotate relative to the grinding piece (9).

Pipe (1
3), a blower (18) for supplying an appropriate amount of air or inert gas, etc., and a feeder (19) for supplying the material to be ground are connected to the pipe (13), and the rotation of the disk (7) is The structure is such that the material to be ground is sent to the lower part of the inner circumferential surface (4a) of the casing by the accompanying centrifugal force and the flying by the blade fil (10).

A discharge port (11) for the ground material is formed at the upper end of the casing (4), and the inner peripheral surface of the casing (4a) and the ground material (9)
The structure is such that only sufficiently finely ground material is sent out through the discharge port (11) by airflow.

Pass the classifier (A) directly through the casing (4), and connect the classifier (
In A), a vertical rotating shaft (
22) and the second tapered conical body (23) attached to the second
As shown in the figure, a large number of classifying blades (24) are attached to a conical body (23), and a trap collection path (14) is connected to the space surrounded by the classifying blades (24), as shown in Figure 4. As shown, the case (20) and the classification blade (24) are separated by the unevenness of the case (20).
), and use an appropriate ultrafine powder collector such as an electrostatic precipitator (
15) and the exhaust fan (16) in that order through the fine powder collection path (
14).

A starting end portion (25
) and the casing (4).
) is integrally formed with a ring-shaped partition wall (28) forming the terminal side portion (26) of the coarse powder return path, and a large number of blades (2
9) so as to rotate integrally with the casing (4) (see Figure 5), and removes coarse powder that is blown away by the classification blades (24) and slides down on the inner surface of the case (20) of the classifier (A). The coarse powder is sent from the starting end portion (25) of the coarse powder return path to the terminal end portion (26) connected thereto, and is sent to the inner circumferential surface of the casing due to the centrifugal force accompanying the rotation of the ring-shaped partition wall (28) and the flying action of the blades (29). The coarse powder is configured to be sent to the upper part of the inner circumferential surface (4a) of the casing from the discharge port of the terminal end portion (26) toward (4a), and is configured to re-mill the coarse powder.

An outer case (17) is provided that surrounds the casing (4) and the case (20) of the classifier (A), and a blower (18) is connected to the outer case (17) through a flow path (30) with a variable throttle. (4) and the case (20) to prevent powder from flowing out.

The material to be ground may be, for example, mineral products such as calcium carbonate or talc, or various other materials.

The rotation speed of the casing (4) is preferably 10 to 50 m/sec, and the rotation speed of the grinding pieces (9) is 1 to 30 m/sec.
/sec is desirable.

[Another example]

Next, another embodiment will be described.

The shape of the inner peripheral surface of the casing (4) can be changed as appropriate, and the shape, material, number of installed pieces, etc. of the crushed pieces (9) can be changed as appropriate, and an appropriate cooling means for the crushed pieces (9) can be changed. The grinding pieces (9) may be fixed.

The gas sent to the casing (4) can be appropriately selected depending on the material of the material to be ground, and an appropriate air supply means depending on the type of gas, such as an electric blower or a pressurized gas cylinder, can be used. These are collectively referred to as an air supply device (18).

The specific configuration of the classifier (A) can be changed as appropriate, and for example, those shown in the following items (a) or =) can be used.

(b) As shown in Figures 6 and 7, a sieve (31) such as a wire mesh or a membrane with fine holes is stretched over the upper part of the case (20), and a slit-shaped spout is inserted into the sieve (31). A rotary nozzle (32) formed to face the sieve (31) is provided on the downstream side of the sieve (31), an electric motor (33) is interlocked and connected to the rotary nozzle (32), and an air supply installation (18) is connected to the flow path (34) with a variable throttle. ) and a rotary joint (35), and the ejected gas from the rotating nozzle (32) acts on almost the entire surface of the sieve (31) to prevent clogging of the sieve (31).

(0) As shown in Figure 8, an oscillator (3
The vibrator of 6) is brought into contact with the sieve (31) to prevent clogging of the sieve (31) due to the vibration of the sieve (31).

(c) As shown in Figure 9, the downstream space of the sieve (31) (
37) is connected to the compressor (38) by a pressure path (39), and a solenoid valve (41) that is repeatedly opened and closed in short cycles by the controller (40) is installed in the pressure path (39), and the downstream space is The structure is such that an impact force is applied to the sieve (31) by the pressure fluctuation of (37) to prevent clogging of the sieve (31).

(d) An ultrasonic generator is attached, and the sieve (31) is vibrated by the ultrasonic waves emitted toward the sieve (31) to prevent clogging of the sieve (31).

The cylindrical partition wall (27) and the ring-shaped partition wall (38) are ground into pieces (9).
) may be installed so that it rotates integrally with the Further, the cylindrical partition wall (27) and the ring-shaped partition wall (28) are formed separately,
The cylindrical partition wall (27) may be fixed to the case (20), and only the ring-shaped partition wall (28) may be provided so as to be freely rotatable. Furthermore, a dedicated drive device for the cylindrical partition wall (27) and the ring-shaped partition wall (28) may be provided.

The auxiliary equipment of the grinder, such as the equipment for supplying the material to be ground to the grinding chamber (3) and the equipment for collecting the ground material, can be freely changed, added, or omitted.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of the drawing]

1 to 5 show embodiments of the present invention, FIG. 1 is an overall conceptual diagram, FIG. 2 is a sectional view taken along line nn in FIG. 1, and FIG. 3 is a III-I line in FIG. The line sectional view, FIGS. 4 and 5 are partially enlarged views, respectively. FIG. 6 is a partially cutaway conceptual diagram showing another embodiment of the present invention, and FIG. 7 is a sectional view taken along the line ■--■ in FIG. 6. FIGS. 8 and 9 are explanatory diagrams of main parts showing different embodiments of the present invention. FIG. 10 is an overall conceptual diagram of a conventional example. (3)...Friction chamber, (4)...Casing, (4a)...Inner peripheral surface of casing, (5)
...... Drive device, (9) ...... Grinding pieces, (
11)...Discharge port, (18)...Air supply device, (25)...Start end side of coarse powder return path,
(26)...Terminal side portion of the coarse powder return path, (27
)...Cylindrical partition wall, (28)...Ring-shaped partition wall, (29)...Blade, (A)...
・Classifier.

Claims (1)

[Claims] 1. A casing (4) forming a grinding chamber (3) is provided rotatably around a vertical axis, and the material to be ground inside the casing (4) is rotated by centrifugal force. Inner peripheral surface (4a)
A drive device (5) is provided that rotates at high speed so as to be pressed against the casing, and a grinding piece (9) is provided in the casing (4) so as to be rotatable relative to the inner circumferential surface (4a) of the casing.
The ground material discharge port (11) is located on the upper end side of the casing (4)
), an air supply device (18) is attached to the inside of the casing (4) for supplying a gas for transporting the ground material, a classifier (A) is connected to the discharge port (11), and the classifier (A) is connected to the discharge port (11). (A)
The grinder is provided with a coarse powder return path from the casing (4) to the casing (4), the classifier (A) being connected to the casing (4).
A cylindrical partition wall (27) that directly communicates with the discharge port (11) and defines a starting end portion (25) of the coarse powder return path on the outer periphery of the discharge port (11).
) is provided inside the casing (4), and the terminal end portion (26) of the coarse powder return path is connected to the starting end portion (25), and the discharge port is directed toward the inner circumferential surface (4a) of the casing. This grinder is provided with a ring-shaped partition wall (28) that is formed in a vertical direction and is rotatably driven around the center. 2. The cylindrical partition wall (27) and the ring-shaped partition wall (28)
The grinder according to claim 1, wherein the grinder is integrally formed with the casing (4) and is attached to the casing (4) so as to rotate integrally with the casing (4). 3. The ring-shaped partition wall (28) is attached to the casing (4)
A member attached to the casing inner peripheral surface (4a
) The second claim is a wing (29) that flies off to the side.
The grinder described in section.