JPS6136461B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a wet pulverizer.

There have been various types of wet pulverizers, and among them, the media agitation type pulverizer shown in FIGS. 1 and 2 is widely used because of its high pulverization efficiency.

The medium agitation type crusher 1 shown in FIG. 1 has a rotating body 5 fitted in a tank 2 with a certain gap 3 and attached to a hollow rotating shaft 4. The hollow rotating shaft rotates at high speed. 4, a slurry made by mixing water and particles of the object to be crushed in a constant ratio and balls as a crushing medium are continuously introduced into the tank 2 through the lower end opening 4a,
The slurry and balls are fed into the gap 3 by the pumping action of the blades 5a on the lower surface of the rotating drum 5, which rotates at high speed, and are stirred by the rotating drum 5, which rotates at high speed, to finely pulverize the particles of the material to be crushed. 3 is raised and discharged to the outside of the tank 2 through a discharge port 6 on the outer periphery of the upper end, and the discharged slurry and balls are sent to a sieve 8 through a discharge pipe 7, where the slurry and balls are separated, and the slurry is passed through a discharge pipe 7. The balls are sent to the slurry tank 9 and stored there, and the balls are fed to the feeder 1.
0, the balls are sent to a ball washing tank 11, where they are washed with water, and the washed balls are sent to a sieve 13 through a transport pipe 12, where they are drained, and only the balls are fed into the hollow rotating shaft 4 again by a feeder 10'. Ru. At this point, a new raw material, slurry, is also introduced.

The medium agitation type crusher 15 shown in FIG. 2 has an agitator 20 concentrically arranged in a tank 17 with a cooling jacket 16 provided on the outer circumferential surface and the bottom surface, and an agitator 20 having multiple stages of arms 19 orthogonally arranged on a rotating shaft 18. A predetermined amount of slurry containing a certain ratio of water and particles to be crushed and balls as a grinding medium are put into a tank 17, and the agitator 20 is rotated for a required period of time to agitate the slurry and balls. At the same time, the drain valve 21 provided at the bottom of the tank is opened, and the circulation pump 23 provided in the middle of the circulation pipe 22 is driven to circulate the slurry through the circulation pipe 22 to the tank 1.
7 and repeat the process of pulverizing the particles of the material to be pulverized in the slurry. During this wet pulverization of particles of the material to be pulverized, the balls, which are the pulverizing media, move in the direction of the arrow in the tank 17, but the ball surface B is at a much lower position than the slurry surface S due to natural sedimentation. The product slurry obtained by rotating the agitator 20 for a required time to wet-pulverize the particles to be crushed is discharged by opening the valve 24 downstream of the circulation pump 23 in the circulation pipe 22, and the balls in the tank 17 are discharged. Tilt it 90 degrees and eject it.

By the way, each of the above-mentioned media stirring type crushers 1 and 15
In both cases, the slurry is stirred using balls as the grinding medium, so the inner surfaces of the tanks 2 and 17 are significantly worn and damaged, and the balls, which are the grinding medium, are also damaged.
As a result, impurities such as ball fragments and particles due to wear and tear of the tanks 2 and 17 are mixed into the product slurry, resulting in a decrease in the quality of the product slurry.

Further, in the media agitation type crusher 1 shown in Fig. 1, the balls as the grinding medium are circulated outside the tank 2, and in the medium agitation type crusher 15 shown in Fig. 2, circulation circuits are provided to circulate the slurry outside the tank. Not only does the cost of the associated equipment and operation cost become enormous, but also a great deal of labor and time is spent on maintenance, inspection, maintenance, etc.

Furthermore, in each of the media agitation type crushers 1 and 15 shown in Figs. 1 and 2, circulation passages for the slurry and balls are not clearly secured in the tanks 2 and 17, so that the progress of grinding is limited to the inside of the tanks. Differences occur depending on the part. As a result, the particles in the product slurry are dispersed, and the particle size range of the particles is widened.

The present invention has been made to solve such problems, and it is possible to narrow the particle size range of particles in a product slurry without requiring a grinding medium such as a ball, and without circulating the slurry outside the tank. Moreover, it is an object of the present invention to provide a wet-type pulverizer that can obtain a product slurry of good quality without contamination with impurities.

An embodiment of the wet type pulverizer according to the present invention will be described below with reference to FIGS. A large number of convex portions 27 are provided to form an uneven surface, a discharge port 28 is provided in the tangential direction of the lower end, and a valve 29 is provided at the tip.
A rotary tank 30 is fitted into the lower half of the fixed tank 25 with a certain gap 31 therebetween, and is rotatably supported by the pedestal 26 by bearings 32 and 33, and extends through the bottom plate of the fixed tank 25. It is supported at the upper end of the vertical rotation shaft 34. The outer circumferential surface of the rotating tank 30 is provided with a large number of convex portions 35 along the generatrix line to form an uneven surface, the inner circumferential surface 36 is formed in a conical shape, and the circumferential wall is hollow. Further, a plurality of openings 37 (four in this example) are provided at equal angular intervals on the outer periphery of the lower end of the rotating tank 30, and inside the openings 37, the rotating tank 3
Impeller 38 that performs pumping action by rotation of 0
A plurality of stirring blades 40 (four in this example) are provided on the lower surface of the bottom plate 39 of the rotating tank 30. 41 is an upper space in the fixing tank 25;
Reference numeral 2 denotes an upper casing provided at the upper end of the fixed tank 25, in which an input port 43 is provided in the center and a gas passage 44 is provided on the side thereof. 45 is a pulley fixed to the lower end of the vertical rotating shaft 34, and 46 is a drive belt, which is stretched around the pulley 45 and a pulley (not shown) on the rotating shaft of the electric motor.

Next, the operation of the wet pulverizer of the present invention constructed as described above will be explained. The valve 29 at the tip of the discharge port 28 provided at the lower end of the fixed tank 25 is closed, and the slurry containing water and particles to be crushed at a certain ratio is poured into the input port 43 slightly above the upper end of the rotating tank 30. After supplying the slurry to a certain position, an electric motor (not shown) is driven to rotate the rotary tank 30 at high speed by the drive belt 4, and the slurry in the rotary tank 30 is rotated downward along the conical inner circumferential surface 36 due to centrifugal action. The rotary tank 30 is moved downward by the impeller 8 which acts as a pump through the opening 37 on the outer periphery of the lower end.
and the fixed tank 25 into the annular gap 31.
The slurry that has entered this gap 31 becomes an upward swirling flow due to the rotational force of the rotating tank 30 that is rotating at high speed, and the particles of the material to be crushed in the slurry are given velocity energy and are transferred to the inner peripheral surface of the fixed tank 25. The convex portion 3 on the outer peripheral surface of the rotating tank 30 is crushed by colliding with the uneven surface of the
5 and the convex portion 27 on the inner circumferential surface of the fixing tank 25, the particles are further pulverized and transported upward, exiting from the annular gap 31 and reaching the upper space 41 of the fixing tank 25. , from here it enters the rotating tank 30 again. Thereafter, the circulation of the rotating tank 30 → opening 37 → circulation gap 31 → upper space 41 → rotating tank 30 is repeated for a certain period of time, and each time the particles of the material to be crushed in the slurry pass through the crushing zone of the annular gap 31. The powder is crushed to a predetermined particle size. The product slurry is stored in a slurry tank through a transport pipe (not shown) by opening a valve 29 at the tip of the discharge port 28.

During the circulation of the slurry, the particles to be crushed that settle to the bottom of the fixed tank 25 are stirred by the stirring blades 40 that rotate at high speed and are integrated with the rotating tank 30, and are moved outward along the bottom surface of the dish-shaped tank. It enters the annular gap 31 while rotating and is subjected to a crushing action.

In addition, in the circulation of the slurry, the slurry coming out from within the annular gap 31 is actively and smoothly transferred to the rotating tank 3.
0, the rotary tank 3 is placed at a position opposite to the upper inner peripheral surface of the fixed tank 25 as shown in FIGS. 6 and 7.
If a guide 47 having an arc-shaped cross section is provided toward the inside of the tube, the slurry can be circulated even more efficiently.

As described above, the wet-type pulverizer of the present invention can pass slurry containing water and particles to be pulverized at a certain ratio into a rotating tank with a conical inner peripheral surface → an opening at the lower end of the rotating tank → an inner periphery of the lower half of the fixed tank. The particles of the material to be crushed in the slurry are pulverized in the annular gap by repeatedly circulating the order of the annular gap between the uneven surface of the surface and the uneven surface of the outer peripheral surface of the rotating tank → the upper space of the fixed tank → the rotating tank for a certain period of time. Since the powder can be ground to a predetermined particle size each time it passes through a zone, there is no need for grinding media such as balls as in conventional wet mills. In addition, since grinding media such as balls are not required, the inner surface of the fixed tank and the inner and outer surfaces of the fixed tank will not be damaged by wear, and impurities such as particles due to wear and tear of the fixed tank and rotating tank can be contained in the product slurry. Since there is no contamination, it is possible to prevent the quality of the product slurry from deteriorating. Furthermore, all the particles of the product to be crushed in the circulating slurry pass through the crushing zone of the annular gap the same number of times, so there is no scattering of particles in the product slurry, and the particles have a sharp particle size distribution with a narrow particle size range. A product slurry containing particles of granular size can be obtained. In addition, the wet type pulverizer of the present invention can easily adjust the particle size of particles in the product slurry to a predetermined particle size by adjusting the operating time, the rotation speed of the rotary tank, etc. Furthermore, since the wet-type pulverizer of the present invention is of a type that uses all the space inside the machine to form a self-circulating path for the slurry, a circulation circuit is provided outside the machine like a conventional media agitation type pulverizer. There is no need for such equipment, the cost of associated equipment and operating costs are eliminated, and maintenance, inspection, maintenance, etc. are only required with this machine, making it extremely simple, and has many excellent effects such as saving a lot of labor and time. be.

[Brief explanation of the drawing]

1 and 2 are schematic sectional views showing a conventional medium stirring type pulverizer, respectively, FIG. 3 is a longitudinal sectional view showing an embodiment of the wet pulverizer of the present invention, and FIG.
Figure 5 is a cross-sectional view taken along line A--A in the figure, and Figure 5 is B- in Figure 3.
6 is a longitudinal sectional view of a main part of another embodiment of the wet type pulverizer of the present invention, and FIG. 7 is a sectional view taken along the line CC in FIG. 6. 25... Fixed tank, 27... Convex part, 28... Outlet, 3
0...Rotating tank, 31...Gap, 34...Vertical rotating shaft, 3
5... Convex portion, 37... Opening, 38... Impeller, 39
...bottom plate, 40...stirring blade, 42...upper casing, 43...inlet.

Claims (1)

[Claims] 1. A fixed tank having a number of convex portions along the generatrix line in the lower half of the inner peripheral surface and a discharge port in the tangential direction of the lower end, and a lower half in the fixed tank supported by the upper end of the vertical rotating shaft. The inner circumferential surface is formed into a conical shape, the inner circumferential surface is formed into a conical shape, the outer circumferential surface has a number of convex portions along the generatrix line, and the lower end thereof is provided with openings at equal angular intervals. A wet-type pulverizer comprising a rotating tank with an impeller installed inside and a stirring blade provided on the lower surface of the bottom plate, and an upper casing provided at the upper end of the fixed tank and having an input port.