JPH0679677B2 - Planetary ball mill with temperature adjustment function - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is most suitable for a planetary ball mill, particularly a mill for finely pulverizing a crushed material charged in each batch type, but also for a continuous type. Applicable.

[Prior Art] The general structure of a planetary ball mill is to equip a plurality of mill pots that revolve around the rotation of the spindle evenly around the spindle (if there are two or more, symmetrically and equidistantly from the spindle if there are three or more). The mill pot itself is also arranged to rotate on its own axis of rotation.

Specifically, the mill case is fixed to the casing that rotates together with the main shaft, and the sun gear around the main shaft meshes with the planetary gears around the outer periphery of the mill case, causing the mill case to rotate while revolving. It is typical to interlock the mill pot fitted and locked in the inside of the container with the case, and when the crushing is completed, remove only the mill pot from the mill case and collect the fine powder in the pot.

In the normal rolling ball mill, the balls of the grinding medium and the ground material cause a cascade motion in one rolling cylinder, and the particles are crushed and crushed by the gravity drop, and the planetary ball mill is used. Has a synergistic effect of the centrifugal force due to the above-mentioned orbital and rotational movements and Coriolisca, and the crushing force has been remarkably strengthened and boasts excellent efficiency.

In particular, the frictional force due to high-speed rotation is strong, and fine powder having an average particle size of several microns can be obtained by charging silica sand of, for example, several millimeters and operating for only a few minutes.

[Problems to be Solved by the Invention] As described above, the planetary ball mill is characterized by a strong crushing efficiency in a short time. However, the bearing that supports the mill case is harsh due to the intense planetary motion of revolving at high speed and adding rotation. Are concentrated under heavy load and face adverse conditions of heat generation and wear. Of course, all conventional planetary ball mills also cope with adverse conditions by circulating lubricating oil (mainly mineral) to the bearings of the mill case, but in this case a separate circulation device is required, As a result, the device is large and expensive.

Furthermore, the biggest problem of the planetary ball mill is that the strong grinding action in the mill pot causes the steel balls, which are the grinding media, to receive centrifugal force and continue to collide with violent sliding motion, so a large amount of grinding friction heat is generated. There is a risk that the crushed product may be heated and the quality of the crushed product may be altered or a chemical reaction may occur to cause quality defects. This problem is important because this device is evaluated for its characteristics and is targeted for fine grinding of fine chemicals and chemicals.

Moreover, if not only the prevention of heat generation but also the function of maintaining the grinding condition at a constant temperature above normal temperature can be added, for example, a special gas is enclosed in the mill pot to enable surface modification of powder and mechanical alloying. It is also possible to further extend the range of applicability of this type of device.

In order to solve the above problems, an object of the present invention is to provide a planetary ball mill that additionally has a temperature adjusting function under grinding conditions.

[Means for Solving the Problems] A planetary ball mill having a temperature adjusting function according to the present invention has a plurality of mill cases arranged at equal intervals in parallel with a main shaft, and is inserted into a mill pot that is fitted and locked in the mill case. In a configuration in which a crushing medium and an object to be crushed are accommodated and the rotation of the mill case is added to the revolution around the spindle, an annular hollow portion is formed between the inner peripheral surface of the mill case and the outer peripheral surface of the mill pot, The above problems were solved by forcibly circulating liquids of the same quality into the bearing part and the annular hollow part at the same time.

Even more specifically, said liquid is water or a water-lubricating agent,
It has been clarified that it is the most desirable embodiment that a rust preventive agent or the like is added, or that the liquid is an oil, and that the passage is provided with a means for heating or cooling the liquid. .

[Operation] Due to the above-mentioned configuration, the liquid whose temperature is controlled always flows into the annular hollow portion between the mill case and the mill pot, and acts so as to maintain the grinding conditions at a constant temperature. Generally, most of the purpose is to act as a refrigerant to take away the heat generated and cool the pot, but sometimes there is a request to exert the function of constantly maintaining at a specific temperature to form special conditions. Can also respond.

At the same time, this liquid also forcibly enters the bearing portion that supports the mill case, so that heating and seizing of the bearing is prevented and smooth high-speed rotation is guaranteed.

Regarding cooling itself, water or a water bearing mainly composed of water and reinforced with additives has a large capacity, and while it has an excellent value of about 10 times or more compared with general mineral lubricants, it is priced. It has the advantage of being extremely cheap.

In the case of oils, the cooling effect is inferior to that of water, but it also has an advantage of preventing rusting of the flow path and preventing deterioration such as corrosion of members. In addition, it is possible to forcibly lubricate the rotation bearing and the revolution bearing around the main shaft with the same oil. Regarding the liquid to be selected, it is necessary to select the most suitable liquid depending on the grinding conditions and the design of the device.

[Embodiment] FIGS. 1 to 3 show a first embodiment of the present invention, which has a structure suitable for using water or a water-based adjusting liquid as a temperature adjusting medium.

The bearing stand 2 is erected on the pedestal 1 to support the entire apparatus, and the driving force of the motor 20 is from the drive vehicle 5 via the driven vehicle 4 to the spindle 3
Is transmitted to. A liquid passage hole 31 is provided at the center of the main shaft 3,
From the middle of the main shaft to a liquid chamber 73 through a communication hole 71 that communicates with the disk-shaped rotating body 7.

The rotating body 7 is provided with holes at equal intervals in parallel with the center line of the main shaft, and the cylindrical submerged bearings 14 are fitted therein.
Are supported by the submerged bearing 14.

The mill case 8 is formed with a bottom hole 81 and a side hole 82, and the mill pot 10 is detachably fitted inside the mill case 8 with an annular hollow portion (cooling chamber) 80 interposed therebetween to lock the two via a connecting pin 9. Rotate together.

The cooling chamber 80 has fins 83 in order to enhance the heat conduction ability.
It is one of the preferred embodiments to spirally wind around the peripheral wall from the bottom to the top. A communication hole 72 is bored from the top end of the cooling chamber 80 to pass through the sleeve-shaped submerged bearing 15 and the rotating body 7 in common and to the cover 16 that forms a flow path outside the rotating body.

In operation of the apparatus, first, the lid 11 on the upper part of the mill case 8 is removed, the mill pot 8 containing the raw material to be crushed is inserted into the mill case, and locked by the pin 9. The rotating body 7 revolves by the rotation of the main shaft 3 and the sun gear fixed to the main shaft.
The rotation of the planetary gear 12 meshing with the gear 13 causes the mill case 8 to start rotating in the rotating body.

As shown in FIG. 3, the liquid stored in the liquid tank 30 is a heater.
The temperature is adjusted within a predetermined range by the action of the cooling device 33 or the cooler 32, and is pumped by the pump 34 through the rotary joint 6 through the passage hole 31 in the main shaft to reach the communication hole 71 and the liquid chamber 73. The medium that has entered the cooling chamber 80 through the bottom hole 81 rotates efficiently in a spiral manner and efficiently exchanges heat, and the casing 16 through the communicating hole 72.
And then flow back into the liquid tank 30 through the discharge port 17. The other separated liquid passes through the mill case side surface hole 82, passes through a minute gap between the submerged bearing 15 and the outer periphery of the mill case 8, and performs a lubricating action. The other liquid chamber 73 directly pushes up the minute gap between the submerged bearing 14 and the mill case 8 to form a system passage that joins with the flow passage on the outer periphery of the mill case 8. In the end, the sliding surfaces of both bearings are always rich. A sufficient liquid can intervene to provide a sufficient lubricating action. FIG. 2 is a plan view of this embodiment.

Next, FIG. 4 shows a second embodiment of the present invention,
Rather, it is a configuration suitable for adopting oils as the liquid. Almost the same as the previous example, but instead of the submerged bearing 14 of the previous example, a rolling bearing 18 is adopted, the same oil is forcibly lubricated for the rotation bearing, and the flow path of the liquid is slightly different and different from water. It has been changed to a system that takes into account the liquidity of various types.

[Advantages of the Invention] Since the present invention has the configuration and operation described above, it absorbs the heat generated by the extreme crushing operation to ensure the quality of the fine powder and forcibly applies the lubricant to the bearing portion. By circulating, the frictional resistance of the bearing can be reduced, the life of the bearing can be extended, and the power consumption can be reduced. In addition, it corresponds to the condition setting under the specific temperature required by the special crushing use, and enables a wide range of applications and precise quality control. It can be said that such a function greatly expands the characteristics of the conventional planetary ball mill and has developed the possibility of a new fine powder manufacturing method.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a first embodiment of the present invention, and FIG.
The same drawing is a plan view, FIG. 3 is an overall front view, and FIG. 4 is a vertical sectional view showing another embodiment. 3 ... Spindle, 8 ... Mill case, 10 ... Mill pot, 80 ... Annular hollow part (cooling chamber) 14,15, 18 ... Bearing

Claims (4)

[Claims] 1. A plurality of mill cases are provided at equal intervals in parallel with a spindle, and a grinding pot and an object to be ground are housed in a mill pot which is fitted and locked in the mill case, and revolves around the spindle. In a planetary ball mill that exerts a strong crushing force under centrifugal force by adding the rotation of the mill case, an annular hollow part is formed between the inner peripheral surface of the mill case and the outer peripheral surface of the mill pot, and the bearing part of the mill case is formed. And a planetary ball mill having a temperature adjusting function, characterized in that the liquid of the same quality is forcedly circulated simultaneously to the annular hollow portion. 2. A planetary ball mill having a temperature adjusting function, wherein the liquid is water or water to which a lubricant, a rust preventive and the like are added. 3. A planetary ball mill having a temperature adjusting function, wherein the liquid is oils according to claim 1. 4. A planetary ball mill having a temperature adjusting function, characterized in that the passage is provided with means for heating or cooling a liquid according to any one of claims 1 to 3.