JPS6279855A - Grinding and crushing apparatus - 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] (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 cylinder 1, and Filled with grinding media such as balls, the workpiece a is put into the processing cylinder 1 with the screw shaft 2 turned, and the workpiece a is
are ground into fine product particles C by grinding between them and with the grinding medium, and the product particles C are placed on a fluid such as air or water passing through the processing cylinder 1 and guided out of the processing cylinder 1. It is something.

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 both tops. In this way, when the pumped fluid is introduced from the side wall, the distribution of the produced particles C is biased toward one side from the center of the processing cylinder 1 and accumulated.
The drawback is that it cannot be derived quickly, the production efficiency is relatively low, and the production capacity is small compared to the size of the aircraft.

Therefore, as shown in Fig. 4, the screw shaft 2 is used as a hollow shaft and the fluid is pumped from its upper end to generate a flow radially upward from the center of the lower part of the processing cylinder 1, and the produced particles C are drawn out from the upper part of the processing cylinder 1. As shown in Fig. 5, suction is applied from the upper end of the hollow screw shaft 2 to create a flow toward the center of the lower part of the processing cylinder 1, and the produced particles C are drawn out together with the fluid, thereby eliminating the deviation of the produced particles C. A new idea has been devised.

[Problem that the invention seeks to solve]

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

In addition, in the case of the one shown in Fig. 5, unpulverized heavy particles settle at the bottom of the processing tube 1, so there is a risk of inhaling them, and there are many problems with the particle size of the produced product particles C, which are large. If the particles cannot be sucked in, they will remain and the lower end suction portion of the screw shaft 2 will be blocked, causing a problem in that the produced particles C cannot be drawn out smoothly.

[Object of the Invention] The object of the present invention is to solve the problems of the grinding and crushing apparatus shown in FIGS. 4 and 5 above.

[Objective 2) Means for Achieving] In order to achieve the above object, the present invention provides a grinding and pulverizing device in which the screw shaft is hollow, with the upper end of the screw shaft serving as a fluid suction port, and the lower end serving as a processing cylinder. It was opened at the bottom, and a suction device such as an intake fan or a suction pump was connected to the top of the processing cylinder.

[Effect]

The device configured in this manner charges the material to be processed into the processing cylinder while rotating the screw shaft, grinds the material between themselves and with a grinding medium, and grinds the material into fine production particles. By suctioning from the upper part of the processing cylinder, fluid flows into the processing cylinder through the screw shaft, and a radial upward flow is generated from the lower part of the screw shaft, and the produced particles rise along with this flow and flow out of the bay. derived.

〔Example〕

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

As shown in FIG. 1, a screw shaft 11 is provided on the central axis of a vertical cylindrical processing tube 10 whose upper and lower surfaces are closed. It is suspended and supported by support means and rotated by a motor (not shown).

The screw shaft 11 is a hollow shaft whose upper end communicates with the outside of the machine and whose lower end opens at the lower part of the processing cylinder 10. By creating a negative pressure inside the processing cylinder 10, this shaft 11
Air flows into the lower part of the processing cylinder 10 through.

At the top of the processing cylinder 10, an input port 12 for a crushing medium and a material input port 13 are formed, and the crushing medium such as ceramics, stones, steel balls, etc. is filled from the former input port 12 to the L level shown in the figure. , the material to be processed a is fed from the latter input port 13 by a screw conveyor or the like in an airtight manner, and by the rotation of the screw shaft 11, the grinding media and the material to be processed are fed.
are moved and stirred as shown by the arrows in the figure, and the material to be processed A is ground between them and with the grinding medium, resulting in fine product particles C.
crushed into

An inverted cone-shaped classification member 14 is provided at the upper part of the screw shaft 11 inside the processing cylinder 10, and as shown in FIG. The airflow is curved in the direction of rotation of the member 14 and arranged at equal intervals, and when the airflow passes between the member 14 and the blades 15, the blades 15 create a swirling flow for classification. An intake port 16 is formed on the upper surface of the upper processing cylinder 10 of the classification member 14, and an intake fan 18 is connected to this intake port 16 via a product collection device 17 such as a back filter or cyclone. The intake air creates a negative pressure inside the processing cylinder 10, and air flows in from the upper end of the screw shaft 11.

In addition, in order to obtain the production particles C with the desired particle size and to perform smooth operation, it is sufficient to extract various parameters and perform the operation based on them. For example, the raw material level in the processing cylinder 10, Detects the airflow speed (airflow rate), product particle size, etc. The raw material level may be detected directly with a level needle, but may also be calculated based on the differential pressure between the air inlet and outlet of the processing cylinder 10 (intake port 16 and the upper end of the screw shaft 11). Further, the air flow velocity is detected at the suction portion (the upper end of the screw shaft 11) using an orifice, a Venturi tube, or the like. The raw material level is controlled by adjusting the raw material input amount, and the air flow speed is controlled by adjusting the fan rotation speed.

In M, 19 is an outlet for the grinding media.

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

Now, when the screw shaft 11 is rotated and the material to be processed a is thrown in as appropriate, the material to be processed a is ground into fine production particles C by the stirring action of the screw shaft 11 and by grinding between them and the grinding medium. It is crushed and becomes lighter.

On the other hand, when air is taken in by the intake fan 18, the air flows into the lower part of the processing cylinder 10 through the screw shaft 11, 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 are transferred to the classification member 14 and the blade 1.
Coarse particles are separated by the air intake port 16 and sent to the collection bag W17, where 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, since the intake air of the intake fan 18 generates an airflow for discharging the produced particles C, the inside of the processing cylinder 10 becomes negative pressure, and there is no need for sealing performance to prevent contamination of the working environment. Operation control also becomes easier.

Furthermore, the flow velocity and flow rate at the intake port 16 are determined by the intake fan 1
8, production particles C having a uniform particle size can be obtained.

As shown in FIG. 3, the classification member 14 is configured as an impeller 14' that is rotatable with respect to the screw shaft 11 and rotated separately by an external motor 20, and the inner surface of the processing cylinder 10 is used instead of the impeller 1S. An annular member 15' having a triangular cross section is provided around the entire circumference, and both 14' are rotated by the rotation of the impeller 14'.
, 15' may be classified by creating a swirling flow in the airflow passing between the airflow.

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 blades 15, and the member 15' are not necessarily provided, and in that case, the material to be processed a is coarse and heavy, so it falls without being sucked into the intake 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 used, 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 machine is supplied to the screw shaft 11.
The suction machine is controlled so that even if the pressure inside is positive, the pressure is zero near the bottom opening, and the inside of the processing cylinder 1 is under negative 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 drawings]

FIG. 1 is a cross-sectional view of an embodiment of the grinding device of the present invention;
Fig. 2 is a sectional view taken along the line X-X of Fig. 1, Fig. 3 is a sectional view of main parts of another embodiment, and Figs. 4 and 5 are schematic views of each side of a conventional grinding device. be. 1.10... Processing cylinder, 2.11... Screw shaft, 13... Processing material inlet, 16.
...Intake port, 18...Intake fan, a.
...Product to be processed, b...Crushed particles, C...
...Produced particles. Patent applicant: Kubota Iron Works Co., Ltd. Agent: Kama 1) Bun 2

Claims (1)

[Claims] A vertical processing cylinder is provided with a vertical screw shaft and filled with a grinding medium, and while the screw shaft is turned, a workpiece is put into the processing cylinder, and the workpiece is separated between each other and In the grinding and grinding device that produces fine product particles by grinding with the grinding medium, the screw shaft is a hollow shaft whose upper end serves as a fluid suction port and whose lower end opens at the bottom of the processing cylinder, and the screw shaft is a hollow shaft whose upper end serves as a fluid suction port and whose lower end opens at the bottom of the processing cylinder. A grinding and grinding device characterized by a connected machine.