JPH04110141U - Continuous air sweep planetary ball mill - Google Patents

Abstract

(57) [Summary] [Purpose] Even if fine media is used in the mill pot of a continuous air swept planetary ball mill, the media may fly out or the mill pot lid may loosely fit into the center of the lid. Prevent media from getting caught in the gaps. [Structure] Screw liners 31 and 33 are provided on the inner walls of the supply side and the outlet side of the mill pot 3, and threads are carved on the inner peripheral surfaces of the screw liners that move toward the inside of the mill pot when the mill pot rotates. be.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is a planetary ball mill, especially by continuously supplying the crushed material, which is the material to be crushed. Continuous air sweep type planetary ball mill for grinding.

0002

[Conventional technology]

The general structure of a planetary ball mill consists of multiple mill pots that revolve around each other as the main shaft rotates. Evenly around the main axis (symmetrically if there are two, radially equidistant from the main axis if there are three or more) ), and the mill pot itself also rotates around its own rotation axis. Specifically, a planetary gear is installed around the outer periphery of a mill pot that rotates together with the main shaft, and this planetary By separately rotating or stopping the sun gear that meshes with the gear, the pot can rotate while orbiting. A typical example is In a normal rolling ball mill, the balls of the grinding medium and the crushed material are placed in one rolling cylinder. It causes a cascade movement, and the crushing and abrasion caused by the gravity fall causes it to shatter. In contrast, a planetary ball mill uses centrifugal force due to high-speed revolution and rotation, and Fine powder with excellent particle size distribution that works synergistically with Liolisca to improve grinding speed. can be obtained in a short time. In particular, the crushing power due to high-speed rotation is outstanding, and For example, when silica sand with a size of a few millimeters is introduced, the average particle size can be reduced to a few millimeters after operating for just a few minutes. A fine powder called chlorine can be obtained.

0003

[Problem that the idea aims to solve]

By the way, in a pulverizer that uses a medium to pulverize the material, the media is generally The smaller the diameter, the more fine powder can be produced, but continuous planetary ball mills Due to its essential structure, traditional methods have not paid much attention when using fine media. Things that did not attract attention will now emerge as new challenges. In other words, the continuous planetary ball mill receives the rotation of the main shaft 1a as shown in Fig. 5. The plurality of mill pots 3a can rotate around their own rotation axis as well as revolve around each other. It is a requirement. In contrast, in order to supply crushed material S to each mill pot without stopping operation, The supply pipe 42a, which revolves with the main shaft, is connected to the inlet of each mill pot. is necessary. In other words, there is a slight gap between the tip of the supply pipe and the mill pot supply side. It is essential to have a configuration in which a bearing must be installed or a bearing must be installed. However, this When the grinding medium B with a small particle size is charged into the mill pot, the medium is bitten into the voids. Products that are clogged and prevent the smooth rotation of the mill pot, resulting in abnormal wear or damage to the grinding media. This may cause problems such as contamination. In manufacturing, this gap is made infinitely small. It is impossible to reduce it. In order to solve the above-mentioned problems, the present invention has been developed in accordance with the structural requirements of this mill. Proposal of a new continuous air sweep type planetary ball mill that prevents special troubles. For the purpose of providing.

0004

[Means to solve the problem]

The continuous air sweep type planetary ball mill according to the present invention has each mill pot There is a screw on the inner peripheral surface of the crushed material supply side that spirals into the mill pot depending on the rotation direction of the mill pot. A strip is engraved on the inner circumferential surface of the mill pot on the outlet side of the mill pot depending on the direction of rotation of the mill pot. The above problem was solved by carving a screw thread that spirals into the mill pot.

[0005]

[Effect]

In the planetary ball mill of this invention, the crushed material is continuously or intermittently pumped together with air at each mill port. supplied to the net. The mill pot revolves around its axis, and the grain size is reached within the mill pot. Only the fine powder pulverized by the air flow is discharged from the outlet side. There are screws carved into the inner walls of the mill pot supply side and outlet side, respectively. This is because it forms a female thread that threads toward the inside of the mill pot as it rotates. , even if there is a medium that tries to escape from inside the mill pot through the doorway, the inside It always stays in the mill pot because it is blocked by the action of sending it back to the mill pot. Also, the grinding is still insufficient. Large particles cannot be discharged in the air, so centrifugal force It is placed on the thread on the exit side and sent back into the mill pot where it is subjected to the pulverizing action again.

[0006]

【Example】 FIG. 1 is a longitudinal sectional front view showing a first embodiment of the present invention, and FIG. 2 is a mill of this embodiment. It is a partial view showing only the pot in detail. As shown in Fig. 1, the basic configuration is the same as the conventional technology, with the main shaft 1 rotating the motor 2A. The transmission rotates a plurality of receiving mill pots 3 evenly arranged around the axis. motor A sun gear 7 is provided around the main shaft 1 which is rotated by 2A, and the sun gear 7 is mounted around the outer periphery of the mill pot 3. It meshes with the planetary gear 21 provided to rotate the mill pot 3, and the mill pot rotates at high speed. While revolving around the main axis, it also rotates around its own central axis. The crushed material S is fed into the hopper 61 of the screw feeder and rotated by the rotation of the screw 62. The supply pipe 42 is inserted through the supply side shaft hole 11 drilled in the shaft center of the main shaft 1 in fixed quantities. is continuously supplied to the inside of the mill pot 3 through the mill pot and charged into the mill pot. Grinding occurs due to the movement of the grinding media. Next, this feature of the present invention will be explained in detail with reference to FIG. In order to continuously supply the crushed material into the mill pot and also to rotate the mill pot, A circular hole is bored in the center of the supply side lid 32 of the mill pot 3, and the supply pipe 42 is inserted into this circular hole. The fixed supply pipe ring 43 is loosely fitted. The supply side lid 32 and the supply pipe pipe Since the ring 43 is in a stationary and rotating relationship, it is fixed to the revolving supply pipe 42. A small gap 37 is formed between the supply pipe ring 43 and the supply side lid 32, and the mill port is closed. This allows for independent rotation of the cut. Furthermore, the supply side and outlet inside the mill pot 3 Screw liners 31 and 33 are installed on the sides at right angles to the axis of the mill pot. This space The screw direction of the clew liners 31 and 33 is both on the supply side and the outlet side. When the mill pot rotates, the grinding media B is pushed into the mill pot from the outside. It is set.

[0007] When the planetary ball mill is operated, the grinding media B filled in the mill pot 3 is By adjusting the strong centrifugal force caused by the rotation and revolution of the Therefore, a surging motion can be made effective for fine pulverization. But that Even at this time, some of the grinding media B is scattered inside the mill pot, and the air gap 37 and the discharge hole 36 Trying to jump outside. At this time, install The mill removes the grinding media B that is about to fly out due to the attached screw liner 31.33. By sending it back into the pot 3, it prevents it from popping out from the discharge hole 36 or entering the gap 37. It can prevent biting and popping out. Now, as shown in FIG. 3, the screw closest to the supply side lid 32 The diameter E of the liner must be equal to or larger than the opening diameter D of the supply side lid 32. There is a point. By doing this, the medium scattered inside the mill pot 3 will be removed from the screw. - Even if you ride on top of Raina's mountain, you will be returned to the inside of the Millpot. Moreover, FIG. 4 shows another embodiment, in which the thread diameters F and L of the female thread of the exit side screw liner are shown. should be equal to or smaller than the thread diameters E and K of the female screw liner on the supply side. Ku. Comparing the two examples shown in Figures 3 and 4, the total length J inside the mill pot is the same, and the inner diameter Even if they are the same, subtract the thread diameter E or K of each screw liner from the inner diameter. The distances H and P in the case of FIG. 4 are clearly larger. In other words, millpot Even if the actual volume of is the same, the effective crushing area expressed as H x J or P x J in is larger in Fig. 4 (tapered thread) and contributes to improving the grinding efficiency.

[0008]

[Effect of the idea]

Since the present invention has the structure and function described above, the supply section and the mill pot are It can prevent the media from getting caught and popping out at the connection part, and at the same time It can also prevent the media from flying out. In addition, unpulverized material is also discharged from the outlet. This improves product quality and grinding efficiency by preventing spilled media from getting mixed in. Contribute to improvement. As a result, the range of selection of grinding media is expanded, and submicron grinding is possible. Effective small-diameter glass beads, resin beads, ceramic beads, steel balls, etc. can also be used. It has the effect of making it more effective.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view showing an embodiment of the present invention.

FIG. 2 is an enlarged partial view of the main part of the same embodiment.

FIG. 3 is a partial view showing the dimensional relationship of the same embodiment.

FIG. 4 is a partial longitudinal sectional front view showing another embodiment.

FIG. 5 is a longitudinal sectional front view showing a conventional technique.

[Explanation of symbols]

1 Main shaft 3 Mil pot 31 Screw liner (supply side) 33 Screw liner (outlet side) 42 Supply pipe S Grinding material B Medium

Claims (2)

[Scope of utility model registration request] Claim 1: A plurality of mill pots that revolve in response to the rotation of the main shaft and that each rotates around its own rotation axis are arranged evenly around the main shaft, and from a supply section that revolves together into the mill pots. In a continuous air-swept planetary ball mill that crushes the supplied crushed material, a screw thread is carved on the inner circumferential surface of the crushed material supply side of each mill pot so that it spirals into the mill pot depending on the rotation direction of the mill pot. A continuous air sweep type planetary ball mill characterized by having a thread carved into the inner circumferential surface on the feed outlet side that spirals into the mill pot depending on the rotation direction of the mill pot. 2. The continuous air swept planetary ball mill according to claim 1, wherein the thread is a female thread, and the thread diameter of the screw liner closest to the mill pot supply side is equal to or larger than the diameter of the mill pot supply side lid.