JPH0432703B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to improvements in cage mills for grinding hard materials such as rocks and gravel.

BACKGROUND OF THE INVENTION Various types of cage mills have been proposed and put into practice. However, in any conventional cage mill, a rotating disk within the casing is configured to be rotatable in both directions as necessary. Therefore, each pin installed in the rotating disk has a circular cross section so that it can be used for rotation in both directions. For example, in the case of clockwise rotation, the right side of the circular pin was mainly used, and conversely, in the case of counterclockwise rotation, the left side of each pin was mainly used.

Problems to be Solved by the Invention In conventional cage mills, the pins have a circular shape as described above, so the shaft for supporting each pin is fixed by passing through a long through hole in each pin. I had to. However, in reality, it is not easy to pass a long shaft through a long through hole in the pin and firmly fix the shaft and the pin. Furthermore, once the shaft and pin are fixed, it is impossible to repair the shaft by replacing only the pin later and using the shaft as is. Therefore,
It was impossible to replace just the pins.

Purpose of the Invention The present invention solves the problems of the prior art as described above (for example, the pins could not be replaced without disassembling the entire cage), and makes it easier to install the pins. The purpose is to provide a cage mill that can be replaced later.

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a disk rotated by a horizontal rotating shaft in a casing, a large number of pins are fixed to the disk, and pulverization is performed by these pins. The cage mill is characterized in that the horizontal rotating shaft is rotated in only one direction, and each pin has a substantially semicircular cross section, so that the surface of the ceramic pin faces only toward the front in the direction of rotation. The gist is cage mill.

Means for Solving the Problems An embodiment of the invention shown in FIGS. 2 and 3 will be described.

Disks 3 and 4 rotated by horizontal drive rotation shafts 5 and 6 are provided in the casing 2, and the disks 3,
A large number of ceramic pins 7, 8 are fixed to 4, and pulverization is carried out by these ceramic pins 7, 8.

The rotating shafts 5 and 6 are rotated in only one direction, and each pin has a substantially semicircular cross section. The surface of the ceramic pin is placed only at the front in the direction of rotation.

Action The raw material collides with the ceramic pin at the front in the direction of rotation and is crushed.

Since the pin is not circular, it is easy to attach the pin. It is also possible to replace only the pins later.

Embodiment In Embodiment 1 of the cage mill according to the present invention shown in FIG. 1, a casing 2 is provided on a base 1 via a frame F. As shown in Figure 2, inside the casing 2 are two discs 3 and 4.
are arranged concentrically.

The center of the disc 3 is connected to a horizontal driving rotation shaft 5. The center of the other disc 4 is connected to another horizontal drive rotation shaft 6. These driving rotation shafts 5 and 6 are rotatably supported by bearings (not shown).

The disc is arranged in the casing so as to be rotatable by a drive rotation shaft, but the rotation direction of the drive rotation shaft and the disc is one-way. For example, for clockwise rotation, only clockwise rotation is possible, and counterclockwise rotation is disabled. The same goes for the opposite: when rotating to the left, the structure is configured so that it never rotates to the right.

Therefore, in the first embodiment, the drive rotation shaft 5 is rotated only in the direction of arrow B in FIG. 3 by a motor (not shown). The drive rotation shaft 6 is configured to be rotated only in the direction of arrow A by a motor (not shown). The arrows A and B are in opposite directions.

On the premise of such one-way rotation, a large number of pins fixed to the rotating disk and a supporting and fixing structure for those pins are designed to have a structure completely different from the conventional one. If the rotation is one-way, the shape of the pin used for crushing does not need to be circular as in the conventional case, and it is sufficient that only the pin used as the crushing surface is made of ceramic. Therefore, the cross-sectional shape of the ceramic pin is approximately semicircular. Then, crushing is performed on the surface of the semicircular ceramic pin.

If the cross-sectional shape of the ceramic is approximately semicircular in this way, one side of the ceramic pin is open, and means for supporting the ceramic is installed in the open part to fix the ceramic. Therefore, it becomes extremely easy to fix the ceramic to a fixing means such as a support member. Moreover, even if the ceramic is replaced with a new one if necessary, the conventional fixing means can be used as is.

Therefore, in Example 1, ceramic pins 7, 8
are removably fixed to the supporting members 11 and 12 in the following manner.

Between the disc 3 and the ring 9, a plurality of support members 11 are removably attached via nuts 13, 33 at equal intervals and concentrically. Further, between the disc 4 and the ring 10, a plurality of support members 12 are removably attached via nuts 14 and 34 at equal intervals and concentrically. The reason why the support member is fixed to the disk or ring with two nuts is to prevent the support member from rotating due to loosening due to vibration.

Ring 9 is arranged concentrically with ring 10, but its diameter is larger than that of ring 10. Further, although the length of the support member 11 is longer than the length of the support member 12, the structures of the two are substantially the same.

As shown in FIGS. 2 and 3, a ceramic pin 7 is detachably attached to the support member 11. Further, a ceramic pin 8 is detachably attached to the support member 12. Both ceramic pins 7, 8 have different lengths, but have a substantially semicircular cross section.

However, the ceramic pin 7 of each support member 11
The front surface, that is, the surface 7a against which the raw material collides, faces in the direction of rotation B in FIG. 3. Further, the ceramic pin 8 of the support member 12 has a third surface 8a.
It faces in the direction of arrow A in the figure.

The support members 11, 12 are of substantially the same construction, and the ceramic pins 7, 8 are also of substantially the same construction. Therefore, referring to Figures 4 and 5,
The structure for fixing the ceramic pin 7 to the support member 11 will be described as a representative example.

The support member 11 has a mounting portion 20 with a rectangular cross section,
It has threaded portions 11a at both ends. This mounting portion 20 has a plurality of bolt holes 21 formed therein.
A plurality of bolts 22 are attached to the inside of the ceramic pin 7.
2 is passed through the bolt hole 21 and fixed with a nut 23. An elastic sheet 24 for shock absorption is preferably interposed between the ceramic pin 7 and the mounting portion 20. This prevents the ceramic pin 7 from cracking.

Further, as shown in FIG. 4, a gap S of about 1 to 3 mm is preferably set at the end of each ceramic pin 7, 8 to prevent direct contact.

Referring to FIG. 2, the aforementioned large number of ceramic pins 7 and 8 constitute a cage-shaped rotor having different dimensions. in general,
The large-diameter disk 3 and the ceramic pin 7 fixed thereon are called a large cage, and the small-diameter disk 4 and the ceramic pin 8 fixed thereon are called a small cage.

In use, the raw material is supplied from the hopper 15 in FIGS. 1 and 2 to the center of the small cage, that is, the drive rotation shaft 6, and is first hit by the surface 8a of the ceramic pin 8 of the small cage. , it is thrown in the outer circumferential direction, and is then hit by the surface 7a of the ceramic pin 7 of the large cage rotating in the opposite direction, and is further crushed into fine pieces.

Finally, the raw material is released from the ceramic pin 7 of the large cage to the outer periphery, and is finally crushed by the breaker plate 17 provided on the inner peripheral surface of the housing 2. Thereafter, the crushed material is discharged from the outlet 16 at the bottom of the housing 2 due to its own weight.

Next, FIG. 6 shows a second embodiment of the present invention. The shapes of each part other than the shape of the ceramic pin 47 are the same as in the first embodiment.

In the second embodiment, in order to facilitate the repair of the ceramic pin, the ceramic pin is not made into a single long piece, but is instead made up of a plurality of sub-divided bodies 48 to 5 divided into three parts.
0 are lined up to form one long ceramic pin 47. Bolts 51 to 53 are provided inside each of the divided bodies 48 to 50, respectively. Each of the bolts 51 to 53 can be passed through the bolt hole 21 of the mounting portion 20 of the support member 11 and fixed with a nut 23.

In this case, even if a part of the ceramic pin is damaged, it is only necessary to replace the divided part of the damaged part, and repair can be easily performed. Furthermore, the length can be easily changed by increasing or decreasing the number of each segment of the ceramic pin 47.

The ceramic pin can be made of alumina porcelain, but is preferably made of silicon nitride.

This type of cage mill has extremely significant effects, especially when used in large-sized mills. Furthermore, there is no need to remove the ring-shaped band during repair, allowing for extremely efficient repair.

By the way, in the example shown in the figure, there are two rows of pins, but there are other types such as one row format (in that case, one disk), four row format, six row format, etc. be. As the size to be crushed or crushed becomes finer, the number of rows of pins generally increases. The particle size can also be changed by changing the rotation speed of the disk.

Further, the shape of the ceramic pin is not limited to that of the embodiment, and may be any shape as long as it is approximately semicircular.

As shown in FIG. 7 as a third embodiment, a groove 72 is formed in the rear surface 71 of a ceramic pin 70, a sleeve bolt 74 is fixed therein via a rubber 73, and the sleeve bolt 74 is used as a support member. You can also do that. Note that the third embodiment can be constructed in the same manner as the first embodiment in other respects.

Further, the shape of the mounting portion of the support member may be, for example, a round bar shape in accordance with the shape of the ceramic pin. At this time, be sure to install the ceramic pin so that its surface faces in the direction of rotation.

Effects of the Invention As explained above, by rotating the horizontal axis of rotation only in a certain direction, each pin of the disk has a substantially semicircular cross section, so that the surface of the ceramic pin faces only toward the front in the direction of rotation. Therefore, there is no need to provide long through holes in the pins and pass long shafts through them, making it easy to install the pins, and also making it possible to replace only the pins later, greatly improving the maintainability of the cage mill. Furthermore, the cost of ceramic pins can be reduced, and the price and maintenance costs of cage mills can be reduced.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing Embodiment 1 of the cage mill of the present invention, Fig. 2 is a sectional view showing the inside, Fig. 3 is a schematic sectional view taken along line X-X in Fig. 2, and Fig. 4 is a support member. and an enlarged view showing the ceramic pin; FIG. 5 is an exploded perspective view showing the support member and the ceramic pin;
FIG. 6 is an exploded perspective view showing a second embodiment of the invention;
FIG. 7 is a schematic sectional view showing another embodiment of the present invention. 3, 4...Disc, 5, 6...Horizontal drive rotation shaft, 7, 8...Ceramic pin, 7a, 8a...
Surface, 11, 12...Supporting member.

Claims (1)

[Claims] 1. In a cage mill in which a disk rotated by a horizontal rotating shaft is provided in a casing, a large number of pins are fixed to the disk, and the grinding is performed by these pins, the horizontal rotating shaft is rotated only in one direction. and each pin has an approximately semicircular cross section,
A cage mill characterized in that the surface of the ceramic pin faces only toward the front in the direction of rotation.