JPH0338903B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a grinding device.

[Conventional technology]

This type of grinding and grinding device is described in Japanese Patent Publication No. 39-5584, and as shown in FIGS. 4 and 5, a vertical screw shaft 2 is provided in a vertical processing tube 1, and a steel Filled with a grinding medium b such as a ball, the workpiece a is put into the processing cylinder 1 with the screw shaft 2 turned, and the workpiece a is ground between each other and with the grinding medium b. finer production particles c
The produced particles c are placed on a fluid such as air or water passing through the processing cylinder 1 and led out of the processing cylinder 1.

By the way, in the conventional grinding and pulverizing apparatus, the fluid is introduced from the bottom side wall of the processing cylinder 1, and the product particles c rising with the flow are discharged from the vicinity of the top of the cylinder. In this way, when the pumped fluid is introduced from the side wall, the distribution of production particles c is biased toward one side from the center of the processing tube 1 and accumulated, so they are not drawn out quickly, resulting in relatively low production efficiency and The disadvantage is that the production capacity is small compared to its size.

Therefore, as shown in FIG.
A flow is generated in a radial direction from the center of the inner lower part, and the produced particles c are drawn out from the upper part of the processing cylinder 1, or as shown in Fig. 5, they are sucked from the upper end of the hollow screw shaft 2 and directed toward the lower center of the processing cylinder 1 A device has been devised in which a flow is generated and the produced particles c are drawn out together with the fluid, thereby eliminating the deviation of the produced particles c.

[Problem that the invention seeks to solve]

However, in the case of the one shown in Fig. 4, since the processing cylinder 1 is under positive pressure with respect to the outside air, the processed material a and the produced particles c tend to leak out of the cylinder, and there is a problem that the working environment will deteriorate unless the sealing performance is improved. be.

In addition, in the case of FIG. 5, unpulverized heavy particles settle at the bottom of the processing tube 1, so
There is a risk of inhaling it, and there are many problems with the particle size of the produced particles c that are extracted, and if large particles cannot be inhaled, they will remain.
There is a problem in that the lower end suction portion of the screw shaft 2 is blocked and the produced particles c cannot be drawn out smoothly.

[Purpose of the invention]

The object of the present invention is to solve the problems of the grinding apparatus shown in FIGS. 4 and 5.

[Means to achieve the purpose]

In order to achieve the above object, in the present invention, in a grinding and pulverizing apparatus having a hollow screw shaft, the upper end of the screw shaft is used as a fluid suction port, the lower end is opened at the lower part of the processing cylinder, and the upper end of the screw shaft is opened at the lower part of the processing cylinder. A suction device such as an intake fan or a suction pump was connected.

[Effect]

The apparatus configured in this manner charges the material to be processed into the processing cylinder while rotating the screw shaft, and grinds the material between each other and with a grinding medium to form fine production particles. By suctioning from the top of the processing cylinder, fluid flows into the processing cylinder through the screw shaft, and a radial upward flow is generated from the bottom of the screw shaft, and the produced particles rise along with this flow and are led out of the cylinder. be done.

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG.
The shaft 11 passes through the upper surface of the processing cylinder 10 and is suspended and supported by support means such as a thrust bearing, and is rotated by a motor (not shown).
The screw shaft 11 is a hollow shaft whose upper end is communicated with the outside of the machine, and whose lower end is connected to the processing cylinder 11.
is opened at the lower part of the processing cylinder 10, and by creating a negative pressure inside the processing cylinder 10, air flows into the lower part of the processing cylinder 10 through this shaft 11.

At the top of the processing cylinder 10, there is an input port 1 for the grinding medium b.
2 and a material input port 13 are formed, and the former input port 12 is filled with grinding media b such as ceramics, stones, steel balls, etc. up to the L level shown in the figure, and the latter input port 1 is filled with grinding media b such as ceramics, stones, steel balls, etc.
3, the workpiece a is sent in an airtight manner by a screw conveyor or the like, and the workpiece a is sent to the screw shaft 11
As a result of the rotation, the grinding medium b and the workpiece a are moved and stirred as shown by the arrows in the figure, and the workpiece a is ground into fine product particles c by grinding between them and with the grinding medium b.

An inverted conical classifying member 14 is provided at the upper part of the screw shaft 11 inside the processing cylinder 10, and as shown in FIG.
0 inner surface, blades 15 are curved in the direction of rotation of the screw shaft 11 and are provided at equal intervals.
When the airflow passes between the blades 15 and the blades 15, the blades 15 create a swirling flow and classification is performed. An intake port 16 is formed on the upper surface of the upper processing cylinder 10 of the classification member 14, and a back filter,
An intake fan 18 is connected via a product collection device 17 such as a cyclone, and the intake air of this fan 18 creates a negative pressure inside the processing cylinder 10, which causes the screw shaft 11
Air flows in from the top of the

In addition, in order to obtain the production particles c of the desired particle size and to perform smooth operation, it is sufficient to extract various parameters and perform the process based on them. For example,
The raw material level in the processing cylinder 10, the air flow velocity (air volume) in the processing cylinder 10, the product particle size, etc. are detected. The raw material level may be detected directly with a level meter, but the
It may also be calculated using the differential pressure at the upper end of 1). Further, the air flow velocity is detected at the suction portion (the upper end of the screw shaft 11) using an orifice, a vent Urie tube, or the like. The raw material level is controlled by adjusting the raw material input amount, and the air flow rate is controlled by adjusting the fan rotation speed.

In the figure, reference numeral 19 is a port for taking out the grinding media.

The embodiment is configured as described above, and its operation will be explained next.

Now, rotate the screw shaft 11 and remove the workpiece a.
When the material to be processed is suitably added, due to the stirring action of the screw shaft 11, the material to be processed a is ground into fine product particles c by grinding with each other and with the grinding medium b, thereby becoming lighter.

On the other hand, when air is taken in by the intake fan 18, the air flows through the screw shaft 11 into the lower part of the processing cylinder 10, spreads evenly around the periphery, rises, and generates an airflow passing between the classification member 14 and the blades 15. The lightened production particles c rise along with this airflow, and the coarse particles are separated by the classification member 14 and the blades 15, and then passed through the intake port 16 to the collection device 17.
At this point, the produced particles c are collected.

During this action, the airflow spreads evenly from the lower end of the screw shaft 11 to the periphery, and the flow agitates the pulverized particles b and the object to be processed a, so that they do not stagnate.

In addition, the particles c produced by the intake air of the intake fan 18
Since the discharge airflow is generated, the processing cylinder 10
There is a negative pressure inside, so there is no need for sealing to prevent contamination of the working environment, and operation control becomes easier.

Furthermore, since the flow rate and flow rate at the intake port 16 can be easily controlled by the intake fan 18, it is possible to obtain the produced particles c with a uniform particle size.

As shown in FIG. 3, the classifying member 14 is configured as an impeller 14' rotatable with respect to the screw shaft 11, which is separately rotated by an external motor 20, and the inner surface of the processing cylinder 10 is used instead of the impeller 15. An annular member 15' having a triangular cross section may be provided around the entire circumference, and the rotation of the impeller 14' may generate a swirling flow in the airflow passing between the two members 14' and 15' for classification. If the triangular member 15' is provided, the passage becomes narrower and swirling flow is likely to occur, but only the impeller 14' may be used.

However, the classification member 14, the impeller 14', the blade 1
5. It is not always necessary to provide the member 15'; in that case, the object to be treated a is coarse and heavy, and therefore falls without being sucked into the suction port 16.

Further, if the air is turned into hot air, dry pulverization becomes possible, and instead of air as the carrier fluid for the production particles c, other gases may be employed, or liquids such as water may also be used.

Furthermore, the flow of fluid may be closed by connecting the exhaust port of the suction device to the upper end of the screw shaft 11 and the suction port of the collection device 17. In this case, approximately two-thirds of the discharge amount of the suction device is supplied to the screw shaft 11, and even though there is positive pressure inside the screw shaft 11, there is zero pressure near the lower end opening, and the inside of the processing cylinder 1 becomes negative. Control the suction machine to achieve the desired pressure.

〔Effect of the invention〕

Since this invention is configured as described above, it is possible to smoothly obtain uniform production particles, and the working environment is also good because the inside of the processing cylinder is under negative pressure, and the operation is easy. Become something.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of one embodiment of the grinding and crushing apparatus of the present invention, FIG. 2 is a cross-sectional view taken along the line X-X in FIG. 1, and FIG.
The figure is a sectional view of a main part of another embodiment, and FIGS. 4 and 5 are schematic views of each example of a conventional grinding and grinding apparatus. 1, 10... Processing tube, 2, 11... Screw shaft, 13... Processing material inlet, 16... Inlet port,
18... Intake fan, a... Processing object, b... Pulverized particles, c... Production particles.

Claims (1)

[Claims] 1. A vertical screw shaft is provided in the vertical processing cylinder, and a grinding medium is filled with the processing material. The workpiece is placed in the processing cylinder with the screw shaft turned, and the workpiece is inserted between the two. and a grinding and grinding device that produces fine product particles by grinding with the grinding medium, wherein the screw shaft is a hollow shaft with an upper end serving as a fluid suction port and a lower end opening at the bottom of the processing cylinder, and a fluid A grinding and grinding device characterized by being connected to a suction machine.