JPS6136460B2 - - 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 outside the tank 2 from the discharge port 6 on the outer periphery of the upper end, and the discharged slurry and balls are discharged through the discharge pipe 7.
The slurry is sent to a sieve 8, where the slurry and balls are separated, the slurry is sent to a slurry tank 9 through the discharge pipe 8 and stored, and the balls are sent to a feeder 10.
The balls are sent to a ball washing tank 11 where they are washed with water, and the washed balls are passed through a transport pipe 12 and passed through a sieve 1.
3, where the water is drained and only the balls are fed into the hollow rotating shaft 4 again by the feeder 10'. 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, which is a mixture of water and particles to be crushed at a certain ratio, 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 mix the slurry and balls. The particles of the material to be crushed are finely pulverized by stirring, and the drain valve 21 provided at the bottom of the tank
The slurry 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 and put into the tank 17, and the process of pulverizing the particles of the material to be ground in the slurry is repeated. 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 period of 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 from the tank 1.
Tilt 7 90 degrees and eject.

By the way, 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 do the costs for the associated equipment and operation costs become enormous, but also a great deal of labor and time is spent on maintenance, inspection, maintenance, etc. In addition, in each of the media stirring type crushers 1 and 15 shown in FIGS. 1 and 2, the tanks 2 and 17
Since a circulation path for the slurry and balls is not clearly secured within the vessel, the progress of pulverization of the particles to be pulverized in the slurry differs depending on the location within the vessel. As a result, the particles in the product slurry are dispersed, and the particle size range of the particles is widened.

The present invention was made to eliminate such time, and does not circulate the slurry or balls outside the tank.
It is an object of the present invention to provide a wet-type pulverizer that can narrow the particle size range of particles in a product slurry by circulating it in a tank.

An embodiment of the wet-type pulverizer according to the present invention will be described below with reference to FIGS. 3 to 5. Reference numeral 25 denotes a fixed tank supported on a pedestal 26, and a discharge port 27 is provided in the tangential direction of the lower end. A screen 28 is stretched over its proximal opening, and a valve 29 is provided at its distal end. 30 is a rotating tank fitted in the lower half of the fixed tank 25 with a certain gap 31, and bearings 32,
33 to be rotatably supported on the pedestal 26 and supported at the upper end of a vertical rotating shaft 34 passing through the bottom plate of the fixed tank 25. The inner circumferential surface 35 of the rotary tank 30 is formed into a conical shape and the circumferential wall is hollow, and a plurality of openings 36 (four in this example) are provided at equal angular intervals on the outer periphery of the lower end. An impeller 37 that performs a pumping action by the rotation of the rotating tank 30 is provided inside the rotating tank 30, and a plurality of stirring blades 39, four in this example, are provided on the lower surface of the bottom plate 38 of the rotating tank 30. 40 is an upper space within the fixed tank 25, and 41 is an upper casing provided at the upper end of the fixed tank 25. An input port 42 is provided in the center, and a gas passage 43 is provided on the side thereof. 44 is a pulley fixed to the lower end of the vertical rotating shaft 34, 45 is a drive belt, and this drive belt 45 is connected to a pulley (not shown) on the rotating shaft of the electric motor and the pulley 4.
It spans 4.

Next, the operation of the wet pulverizer of the present invention constructed as described above will be explained. A certain amount of small-diameter (approximately 0.5 to 2 mm) balls of steel or ceramic as grinding media are introduced into the machine from the input port 42 in advance, and the tip of the discharge port 27 provided at the lower end of the fixed tank 25 is Keep valve 29 closed. Then, after supplying a slurry containing water and particles to be crushed at a certain ratio through the inlet 42 to a position slightly above the upper end of the rotating tank 30, an electric motor (not shown) is driven, and the drive belt 45 rotates the slurry. Tank 30
When the rotating tank 30 is rotated at high speed, the balls and slurry in the rotating tank 30 descend as a downward swirling flow along the conical inner circumferential surface 35 due to centrifugal action, and an impeller 37 acts as a pump through an opening 36 on the outer periphery of the lower end. It enters the annular gap 31 between the rotating tank 30 and the fixed tank 25. The balls and slurry that have entered this gap 31 rise in 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 transferred between the balls and between the balls and the rotating tank 30. The ball is crushed and ground by collision and slippage between the outer peripheral surface of the ball and the inner peripheral surface of the fixed tank 25. The balls and slurry that have exited the annular gap 31 and reached the upper space 40 of the fixed tank 25 enter the rotating tank 30 from here, and are then transferred to the rotating tank 30→
The circulation of opening 36 → annular gap 31 → upper space 40 → rotary 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, they are crushed and ground to a predetermined level. The grain size is . 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 27, and the balls are retained in the machine by a screen 28 at the base end of the discharge port 27.

In the above-mentioned circulation of the balls and slurry, the balls and particles to be crushed that settle to the bottom of the fixed tank 25 are removed by the stirring blades 3 that rotate at high speed and are integrated with the rotating tank 30.
9 and enters the annular gap 31 while rotating outward along the bottom surface of the dish-shaped tank, and the particles of the material to be ground are subjected to the same grinding and grinding action as described above.

As described above, in the wet type pulverizer of the present invention, the circulation path for the slurry containing the balls as the grinding medium and the slurry mixed with water and particles to be ground at a certain ratio is a rotating tank with a conical inner circumferential surface → a lower end of the rotating tank. The order of opening → annular gap between the inner peripheral surface of the lower half of the fixed tank and the outer peripheral surface of the rotating tank → the upper space of the fixed tank → the rotating tank is clearly secured, so that the particles of the material to be crushed in the slurry are crushed. There is no difference in the progress of pulverization depending on the location within the tank, and pulverization progresses as a whole, and all particles of the material to be pulverized in the slurry pass through the pulverization zone of the annular gap the same number of times. Therefore, it is possible to obtain a product slurry containing particles of a predetermined particle size with a narrow particle size distribution and a sharp particle size distribution without particles in the product slurry. In addition, the wet-type pulverizer of the present invention can achieve
The particle size of particles in the product slurry can be easily adjusted to a predetermined particle size. Furthermore, the wet-type pulverizer of the present invention utilizes all the space inside the machine to form a self-circulating path for the balls and slurry, so unlike conventional media agitation type pulverizers, the circulation circuit is outside the machine. There is no need to set up a machine, the cost of associated equipment and operating costs are eliminated, and maintenance, inspection, maintenance, etc. only need to be done with this machine, so it is extremely simple and has excellent effects such as reducing a lot of labor and time. There is.

[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.
5 is a sectional view taken along line AA in the figure, and FIG. 5 is a sectional view taken along line BB in FIG. 3. 25... Fixed tank, 27... Discharge port, 28... Screen, 30... Rotating tank, 31... Gap, 34... Vertical rotating shaft, 35... Inner peripheral surface, 36... Opening, 37... Impeller, 38... Bottom plate, 39... Stirring Vane, 41...upper casing, 42...inlet.

Claims (1)

[Claims] 1 A fixed tank having a discharge port with a screen in the tangential direction of the lower end, and a conical inner peripheral surface supported by the upper end of a vertical rotating shaft and fitted with a certain gap in the lower half of the fixed tank. a rotary tank, which is formed with openings at equal angular intervals at the lower end thereof, an impeller is provided inside the openings, and a stirring blade is provided on the lower surface of the bottom plate, and an input port provided at the upper end of the fixed tank. A wet pulverizer consisting of an upper casing.