JPH0679678B2 - Media stirring type crusher - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention agitates a grinding medium such as a steel ball filled in a cylindrical container together with an object to be ground to cause motion in the medium to grind the object to be ground. The present invention relates to a medium stirring type crushing device.

(Prior Art) As described in the publication "Powder Engineering Term Dictionary (published by Nikkan Kogyo Shimbun), pages 53 and 54", a crushing device of this type includes a cylindrical container installed upright, Screw blades,
A plurality of discs or a plurality of stirring rods are integrally provided with a rotating shaft standing upright in the center of the cylindrical container, and the grinding medium filled with the object to be ground in the cylindrical container is used as a scree blade, disk or stirring rod. It is configured such that the material to be ground is subjected to an impact and a frictional force by the same medium to cause motion by stirring and stirring.

(Problems to be solved by the invention) By the way, in order to improve the pulverization efficiency in the medium agitation type pulverizer, it is necessary to rotate the screw blade, the disc, the agitation rod, etc. at a high speed to cause the pulverizing medium to violently move. In the above-described conventional medium stirring type crushing device, it is difficult to impart strength that can withstand high speed rotation because the structure of the stirring means is complicated, and there is a limit in improving the crushing efficiency.

In view of such problems, an object of the present invention is to provide a medium agitation type crushing device capable of improving crushing efficiency.

(Means for Solving the Problems) A medium stirring type crushing apparatus according to the present invention is provided with a stirring container in which a cylindrical container which is installed upright has a quadrangular cross-sectional shape and which is filled with an object to be crushed and a crushing medium. , A quadrangular prism having a quadrangular cross-sectional shape whose diagonal length is slightly smaller than the inner dimension of the stirring chamber is rotatably provided at the center of the stirring chamber, and the crushing medium is stirred by the quadrangular column. It is characterized in that the portion to be crushed is crushed.

(Operation and Effect of the Invention) According to the above-described configuration, the cross-sectional shape of the space defined by the side surface of the square pole and the inner wall of the stirring chamber changes significantly with the rotation of the square pole, so the grinding medium in the space Irregular movements are induced in the surface, and the object to be ground is ground.

However, according to the present invention, since the quadrangular prism having a simple structure is used as the stirring means, it is possible to easily increase the strength and enhance the durability. Therefore, high speed rotation becomes possible. In addition, by changing the cross-sectional shape of the space defined by the side surface of the square pole and the inner wall of the stirring chamber, motion is induced in the steel ball, so not only the steel ball in direct contact with the square pole but also the stirring chamber It is possible to cause a violent random motion in the entire filled steel ball. Therefore, it is possible to significantly improve the grinding efficiency.

(Example) The present invention will be described below with reference to the drawings. FIGS. 1 and 2 show a medium agitation type pulverizing apparatus according to an example of the present invention. The apparatus is installed upright and has a cylindrical container 1 filled with a steel ball as a grinding medium and an object to be ground, and the container 1
The rotating shaft is rotatably provided at the center of the rotating shaft and is driven by a motor (not shown), and the quadrangular prism fitted to the rotating shaft 2 is provided.

The cylindrical container 1 is provided with a funnel-shaped opening 1a at the upper end and a funnel-shaped outlet 1b at the lower end. Further, four attachments 4 having an arcuate cross-sectional shape are detachably fixed to the inside of the cylindrical container 1 with bolts 5, and the attachment 4 defines a stirring chamber 1c having a square cross-section. ing. The material of each attachment 4 is, for example, chromium molybdenum steel, and is hardened to enhance the surface hardness.

Moreover, a perforated plate 6 is provided at the bottom of the agitating chamber 1c, and the agitating chamber 1c and the discharge port 1b are provided through a plurality of slits 6a formed on the perforated plate 6.
Are in communication. The width of the slit 6a is set smaller than the diameter of the steel ball 7 (see FIGS. 3A and 3B) filled in the stirring chamber 1c.

Next, the square pole 3 has a square cross-sectional shape whose diagonal L1 (see FIG. 3B) is slightly smaller than the inner dimension L2 of the stirring chamber 1c (see FIG. 3B) and the depth of the stirring chamber 1c. A fitting hole 3a having the same overall length and having the rotary shaft 2 fitted therein is formed in the central portion. The rotating shaft 2 and the quadrangular prism 3 are rotated together with a key groove 3b provided along the fitting hole 3a and a key 2a provided integrally with the rotating shaft 2 and fitted in the groove 3b. Connected as possible.

In addition, the rotary shaft 2 has a circular lid 8 that covers the input opening 1a.
Are integrally provided, and the lid 8 is formed with a through hole 8a for introducing the crushed material 9 (see FIGS. 3A and 3B) into the stirring chamber 1c.

The present embodiment is configured as described above, and the steel ball 7 made of nickel chrome steel whose surface hardness is increased by subjecting the stirring chamber 1c to a quenching treatment as a grinding medium, for example, the total volume of the steel ball 7 is the stirring chamber volume.
When the crushed object 9 is charged through the through hole 8a while the square pillar 3 is rotated while being filled up to about 80%, Figs. 3A and 3B are shown.
As shown in the figure, since the cross-sectional shape of the space defined by the side surface of the quadrangular prism 3 and the attachment 4 changes, the steel balls 7 in the space are agitated by irregularly moving horizontally and vertically. . Along with this, the crushed object 9 moves downward by gravity between the steel balls 7 while being crushed by the impact force and frictional force received from the steel balls 7, and the crushed object 9 is crushed by the slits of the eyelet 6.
6a is continuously discharged to the outside of the cylindrical container 1 through the discharge port 1b.

However, according to this embodiment, since the square column 3 having a simple structure is used as the stirring means, the strength can be easily increased and the durability can be enhanced. Therefore, high speed rotation becomes possible. In addition, since the movement is induced in the steel ball 7 by changing the cross-sectional shape of the space defined by the side surface of the square pole and the inner wall of the stirring chamber, not only the steel ball 7 that directly contacts the square pole 3 but also It is possible to cause a violent random motion in the entire steel balls 7 filled in the stirring chamber 1c. Therefore, it is possible to significantly improve the pulverization efficiency.

If the square pole 3 or the attachment 4 is worn, only the square pole 3 or the attachment 4 needs to be replaced.
Since it is not necessary to replace the rotating shaft 2 and the main body of the cylindrical container 1, the replacement cost can be reduced.

In this embodiment, one quadrangular prism 3 was used as the stirring means, but the quadrangular prism was divided into a plurality of upper and lower quadrangular prisms, and the divided quadrangular prisms were attached to the rotary shaft with their phases shifted from each other. By doing so, it is possible to impart more irregular and intense motion to the steel balls 7.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a medium agitation type crushing apparatus according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of the apparatus, and FIGS. 3A and 3B are operation explanatory views of the apparatus. Explanation of symbols 1 ... Cylindrical container, 1c ... Stirring chamber, 2 ... Rotation axis, 3 ...
… Square pillar, 4 …… Attachment.

Claims (1)

[Claims] 1. An upright cylindrical container is provided with a stirring chamber having a quadrangular cross-sectional shape and filled with an object to be ground and a grinding medium, and the length of the diagonal line is slightly larger than the inner dimension of the stirring chamber. A quadrangular prism having a small quadrangular cross-sectional shape is rotatably erected at the center of the stirring chamber, and the crushing medium is stirred by the quadrangular prism to crush the crushed portion. Characteristic medium agitation type crushing device.