JPS63141656A - Crusher - 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 (Field of Industrial Application) The present invention relates to a pulverizer used for pulverizing coal, cement clinker, ceramic raw materials, etc., and in particular to a wet tube mill suitable for ultrafine pulverization. be.

(Prior Art) FIG. 2 shows an outline of a crushing device called a wet tube mill, which has been widely used in the past.

In the figure, reference numeral 1 indicates a hollow cylindrical main body disposed approximately horizontally. A crushed slurry supply pipe 2 and a product slurry take-out pipe 3 are connected to both ends of the main body 1 with the same axis. A steel ball 4 as a grinding medium is housed in the main body 1.

Although not shown in the drawings, the main body 1 is rotated about its axis by a rotating device having an appropriate speed reduction device.

For example, slurry of coarse coal particles and water or crushed slurry supply pipe 2
The ball enters the rotating main body 1, rotates and falls together with the ball 4, and is crushed. The pulverized coal and water are discharged from the product slurry take-out pipe 3.

The principle of pulverization in this conventional wet tube mill is based on the repeated motion of the balls 4 being scraped up and falling as the main body 1 rotates. The crushing action in this case is impact crushing due to the impact force caused by the falling of the ball 4,
It can be divided into grinding due to frictional force generated between the balls 4 and between the balls 4 and the inner wall of the main body 1, but it is well known that the former is mainly caused by impact grinding.

According to research conducted by the present inventors, impact pulverization is generally effective for pulverization with an average particle size of several tens of microns to several hundred microns, and therefore the pulverizing effect of the conventional wet tube mill described above is large.

However, results have shown that grinding is much more effective for ultra-fine grinding, where the average particle size is a few microns or less, and conventional wet tube mills cannot be expected to be as effective as grinding. become.

(Problems to be Solved by the Invention) The present invention was developed to solve the problem that conventional wet tube mills are unsuitable for ultrafine pulverization with a small average particle size. .

(Means for Solving the Problems) Therefore, the present invention provides a hollow cylindrical main body disposed approximately horizontally, a grinding medium housed in the main body, and a means for rotating the main body about an axis. In the crushing device, an outer cylinder is disposed on the outside of the main body with the same axis, and a space between the outer cylinder and the main body is filled with a grinding medium. It is intended as a means of solving problems.

(Function) In the pulverizing device of the present invention, pulverization, mainly impact pulverization, is performed in the main body as in the conventional method. On the other hand, in the space between the outer cylinder and the main body, the grinding medium filled in the space is stirred to perform grinding, mainly grinding.

(Example) Hereinafter, the crushing apparatus of the present invention will be described with reference to an example of the apparatus shown in FIG. In FIG. 1, the same parts as the conventional one shown in FIG. 2 are given the same reference numerals.
Since its function is also the same as that shown in FIG. 2, the different points will be mainly explained here.

Reference numeral 5 denotes an outer cylinder, which is disposed on the same axis as the main body 1, leaving a desired space on the outside thereof, and the space between it and the main body 1 forms an annular crushing chamber 6. 7 is a pulverized slurry supply branch pipe that communicates with the pulverization chamber 6, and 8 is a product slurry discharge branch pipe that also communicates with the pulverization chamber 6. Balls 9 are grinding media and are filled in the grinding chamber 6.
It does not have to be the same as the grinding medium 4 housed in the main body 1, and the weight, size, etc. are determined as appropriate.

A paddle 10 is attached to the outer peripheral surface of the main body 1 and the inner peripheral surface of the outer cylinder 5 so as not to interfere with each other.

Now, pulverization within the main body 1 is carried out in the main body 1 as in the conventional case.
This is done by rotating the unit by a rotating device (not shown). As mentioned above, the crushing here is mainly impact crushing.
The slurry is discharged from the product slurry take-out pipe 4.

On the other hand, the main body 1 and the outer cylinder 5 are connected by the pulverized slurry supply branch pipe 7.
The slurry supplied to the grinding chamber 6 formed between the two is stirred together with the balls 9 by the paddle 10 and ground. The product slurry ground here is discharged from a product slurry discharge branch pipe 8.

As described above, according to the crushing device of this embodiment, while impact crushing is mainly performed in the main body 1, crushing mainly including attrition is performed in the annular shape between the main body 1 and the outer cylinder 5. Since the grinding is carried out in the grinding chamber 6, ultrafine grinding can be carried out in parallel with the conventional normal grinding.

Therefore, by using the apparatus of this embodiment, it is possible to separately obtain the product slurry discharged from the main body 1, which mainly performs impact crushing, and the product slurry discharged from the grinding chamber 6, which mainly performs grinding. Of course, by appropriately mixing these two product slurries having different average particle sizes, it is possible to obtain a slurry having a desired particle size distribution.

In addition to this embodiment, although not shown in the drawings, the product take-out pipe 3
The slurry discharged from the product slurry take-out pipe 3 of the main body 1 can be directly supplied to the grinding chamber 6 by connecting the pulverized slurry supply branch pipe 7 to the main body 1, or the outer cylinder 5 and the main body 1 can be connected in opposite directions. It can also be configured to rotate.

(Effects of the Invention) As described above in detail, according to the crushing device of the present invention,
Since the wet tube mill, which was conventionally considered unsuitable, can also perform grinding, it is possible to perform both normal grinding and ultra-fine grinding in the same device, making it extremely useful industrially.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view of a crushing device showing an embodiment of the present invention, and FIG. 2 is a schematic cross-sectional view of a conventional crushing device. Explanation of the main parts of the figures 1 - Main body 4 - Grinding media 5 - Outer cylinder 6 - Grinding chamber 9 - Grinding media Fig. 1 Fig. 2

Claims (1)

[Claims] A crushing device having a hollow cylindrical body disposed substantially horizontally, a crushing medium housed in the body, and a means for rotating the body around an axis, wherein the axis is arranged on the outside of the body. 1. A crushing device, characterized in that an outer cylinder is arranged, and a space between the outer cylinder and the main body is filled with a grinding medium.