JPH02207854A - Ball mill - Google Patents

Abstract

PURPOSE: To improve polishing efficiency by adopting such constitution as to form the inner peripheral surface of a polishing vessel to a spherical body, to rotate a plurality of polishing members therein and to agitate and polish raw materials to be polished while moving the material in a horizontal direction and a perpendicular direction. CONSTITUTION: The inner peripheral surface of the polishing vessel 23 is formed to the spherical body, such as round shape, elloptospherical shape or polyhedral shape. The vessel is internally provided with a revolving shaft 24 fixed with the plurality of polishing members 35 to 37. The revolving shaft 24 is rotated by a rotating means 26. When the revolving shaft 24 is rotated by this constitution. the raw material to be polished are so agitated and polished as to move in the horizontal direction and perpendicular direction and the friction polishing effect between the raw materials is generated at high frequencies. The fineness of the polishing is made more remarkable and the polishing efficiency is greatly improved.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention uses balls such as glass peas to produce pigments, dyes,
Or it relates to a ball mill for grinding and polishing chemical raw materials such as paints to a predetermined particle size.

(Prior technology) For raw materials that do not like steel balls or iron, porcelain or glass balls are used, and the raw materials are ground or polished by stirring the balls and chemical raw materials in a container. A ball mill conventionally used for this purpose is the one shown in U.S. Pat. No. 4,784.336.

FIG. 7 is a diagram showing the conventional ball mill disclosed in this publication. A cylindrical polishing tube 11 is fixed on the housing 10 of the main body of the device so as to face in the horizontal direction.
A rotary shaft 12 concentric with the rotary shaft 12 is rotatably mounted inside the rotary shaft 1. A plurality of stirring disks 13 are fixed to this rotating shaft 12, and a motor 1 installed in the device main body 10
Each stirring disk 13 is rotated by driving the rotation shaft 12 by the rotation shaft 12 by the rotation shaft 12.

To polish raw materials using such a ball mill, glass beads or balls with a diameter of approximately 2111 mm are injected into the polishing tube 11 in advance, and then a liquid polishing raw material containing powder or granules such as pigments is poured into the polishing tube 11. Raw material population 14 by pump 15
Inject into the polishing cylinder 11 from the inside. In this state, the motor 16
The rotating shaft 12 is rotated to rotate the stirring disk 13. As a result, the glass balls and the liquid raw material are stirred, and the particles in the liquid raw material to be polished are polished by the frictional action between the glass poles, achieving the purpose of pulverization.

(Problems to be Solved by the Invention) In such a conventional ball mill, the polishing tube 11 has a cylindrical shape and is installed in a horizontal direction, so that the stirring disk installed inside the polishing tube 11 has a cylindrical shape. 13 is oriented in the vertical direction, and the glass beads and the raw material to be polished are subjected to a stirring force in the vertical direction by the stirring disk 13.

Therefore, in the past, the frictional action between the glass beads within the polishing tube 11 was limited, and not only was it impossible to obtain a sufficient polishing effect, but the stirring efficiency was also low, making it difficult to achieve pulverization and homogenization. It was not possible to fully satisfy the request.

In addition, in conventional ball mills, the polishing and stirring effects are not good, so it takes a long time and requires repeated polishing to make the particles in the liquid raw material into the desired fine powder. This would be a huge waste of time and energy.

The present invention has been made in view of the problems of the prior art described above, and an object of the present invention is to improve the effect of stirring raw materials in a container so that desired polishing can be performed in a short time.

(Means for Solving the Problems) The present invention for achieving the above object includes a polishing container having a polishing chamber therein, into which a raw material to be polished is injected, and a rotating shaft provided in the polishing container. A plurality of polishing members extending in the outer diameter direction of the polishing container are fixed to the polishing container, a rotating means is connected to the rotating shaft, and the inner peripheral surface of the polishing container is shaped into a spherical shape such as a true sphere, an ellipsoid, a polyhedron, etc. The ball mill is characterized in that the raw material to be polished in the polishing chamber is stirred and polished while being moved in the horizontal direction and the vertical direction by the rotation of the polishing member, and the rotation shaft is This is a ball mill that can be set at any inclination angle between the vertical and horizontal directions.

(Function) The inner peripheral surface of the polishing container into which raw materials are injected into the internal polishing chamber has a spherical shape such as a true sphere, so when the rotating shaft is rotated by a rotating means to rotate the polishing member. The raw material to be polished is stirred and polished while being moved in the horizontal and vertical directions. This improves the polishing efficiency of the material to be polished.In particular, when the rotation axis is tilted, the polishing member also rotates at an angle, and the raw material to be polished is rotated vertically and horizontally within the polishing chamber. The effect of moving to is noticeable.

(Example) Hereinafter, the present invention will be described in detail based on the illustrated example of the present invention.

FIG. 1 is a diagram showing a ball mill 20 according to an embodiment of the present invention.
2 is fixed, and a perfect spherical polishing container 23 is attached to this pedestal portion 22.

A rotary shaft 24 is rotatably mounted in the pedestal 22 by bearings 25a and 25b, and the rotary shaft 24 is inclined at a predetermined angle with respect to the horizontal line as shown in the figure. The upper end portion protrudes from the pedestal portion 22.

In order to drive this rotating shaft 24, a pulley 28 is fixed to the main shaft 27 of a motor 26 installed in the casing 22, and a pulley 29 is fixed to the upper end of the rotating shaft 24.
A belt 30 is stretched between the pulley 28 and the pulley 28 .

Heat is generated from the bearings 25a, 25b due to the rotation of the rotating shaft 24 driven by the motor 26. Therefore, in order to cool the bearings 25a, 25b, the base portion 22
A coolant jacket 31 into which a coolant is injected is formed inside. A plug 32 that closes an inlet for injecting coolant into the jacket 31 is detachably attached to the pedestal portion 22, and a plug 33 that closes an outlet for discharging the coolant is detachably attached. Can be installed freely. Note that the cooling liquid may be constantly circulated within this jacket 31.

The polishing container 23 has a spherical inner wall 38 with a circular cross section, and an outer wall 39 with a predetermined gap therebetween, and these have hemispherical casings facing each other. It is formed by joining with bolts 46.

By interposing a spacer in the gap formed between these two walls, a spiral coolant passage 40 is formed between the two walls. In this cooling liquid passage 40, a cooling liquid passage 41 is opened at one end of the cooling liquid passage 40 and attached to the outer wall 39 of the polishing container 23, and a cooling liquid passage 41 is opened at the other end of the cooling liquid passage 40 and attached to the outer wall 39 of the polishing container 23. A liquid such as cooling water flows toward a cooling liquid outlet 42 attached to an outer wall 39 of 23.

A perfect spherical polishing chamber 45 is formed inside the inner wall 38,
Raw material population 43 for supplying raw materials into this polishing chamber 45
is attached to the inner wall 38 and opens into the polishing chamber 45, and a raw material outlet 44 for discharging the raw material to the outside similarly opens into the polishing chamber 45.
It is opened to the inner wall 38 and attached to the inner wall 38. From this raw material inlet 43, balls or glass beads used for polishing and a material to be polished which is in the form of liquid or slurry and includes granules and powder are supplied into the polishing chamber 45.

A cylindrical member 34 is fitted into the lower end of the rotating shaft 24, and three disk-shaped polishing members 35, 36, and 37 are fixed to the rotating shaft 24 by this cylindrical member 34. These polishing members 35 to 37 not only each have a diameter smaller than the diameter of the inner wall 38, but also have different lengths. Further, each of the polishing members 35 to 37 includes
A plurality of holes are formed in order to reduce the weight of the member and allow the passage of raw materials. Note that the number of these polishing members is not limited to three, but can be any number.Furthermore, instead of using a disc-shaped member, it is possible to use a member extending from the rotating shaft 24 in the outer radial direction of the rotating shaft 24. If so, move the bar material etc. to the rotating shaft 24.
It is also possible to form an abrasive member by fixing it radially to the abrasive member.

2 to 4 are force line diagrams showing the acting force applied to the glass beads and the material to be polished in the specific example of the ball mill described above, and in these figures, the reference numeral 24a indicates the rotation center axis of the rotation shaft 24. The rotating shaft 24 is inclined at an angle θ with respect to the horizontal line H. Further, in these figures, the rotation locus of the tip of the polishing member 35 is shown as an ellipse, and the tips of the other polishing members 36 and 37 also move to positions parallel to this locus.

When the glass beads or the raw material to be polished, located at the polishing site indicated by point P in FIG.
acts, and the own weight W of beads, etc. at this polishing point P
As a result, the resultant force R will act on that part. In other words, since the rotating shaft 24 is inclined and the inner wall 38 is spherical, the glass beads and the material to be polished that are stirred by the polishing members 35 to 37 are acted upon in the horizontal and vertical directions. You will receive power.

As shown in FIG. 3, the resultant force R at the polishing point P can be divided into a component force RV in the direction along the vertical plane and a component force R11 in the direction along the horizontal plane. Furthermore, as shown in FIG. 4, the component force RV can be divided into a tangential component force RVT and a normal component force TVR along the plane shown by the virtual circle S. In particular, due to the presence of this component force RVT, a force that moves the glass beads and the raw material to be polished in the direction along the central axis of the rotating shaft 24 acts at the polishing point P.

FIG. 5 is a diagram showing a ball mill according to another embodiment of the present invention, in which members common to those in the previous embodiment are given the same reference numerals.

This ball mill has the same structure as the previous embodiment except that the inner wall 38a and the outer wall 39a have an elliptical cross section with a long sleeve extending along the central axis of the rotating shaft 24. There is. Therefore, the polishing chamber 45 has an oval spherical shape like a rugby ball. Also in this case,
A stirring polishing action similar to that of the above-mentioned ball mill is applied to the glass beads and the raw material to be polished.

FIG. 6 is a diagram showing a ball mill according to still another embodiment of the present invention, in which members common to each of the embodiments described above are given the same reference numerals.

In this case, the inner wall 38b and the outer wall 39b have a polygonal cross section as shown, and the polishing chamber 45 has a spherical shape made of a polyhedron.

In this case, as in the case where the inner surface of the polishing container 23 is made into a spherical body whose cross section is close to a perfect circle or an ellipse as in the above embodiment, glass beads or the raw material to be polished can be A stirring and polishing action is added to the process.

Further, in the present invention, the shape of the inner circumferential surface of the polishing container 23 is not limited to the shape shown in each of the above-mentioned embodiments, and may be other than the perfect circular sphere, elliptical sphere, polyhedral sphere, etc. What is the shape of the inner circumferential surface of the polishing container 23, that is, the outer circumferential surface of the polishing chamber 45, if each part constituting this outer circumferential surface is curved or inclined with respect to the center of the polishing chamber 45? It may be set to any shape.

The present invention focuses on the shape of the inner peripheral surface of the polishing container 23, that is, the shape of the polishing chamber 4.
The basic principle is that the shape of 5 is a spherical body, and when set to such a shape, the rotation axis 2
Even if the polishing container 4 is not tilted, the inner circumferential surface of the polishing container 23 is entirely curved or inclined with respect to the center of the polishing chamber 45. As a result, the glass beads and the raw material to be polished, which have been subjected to centrifugal force by the polishing members 35 to 37, not only move in the outer diameter direction of the rotating shaft 24, but also move into the polishing container 2.
3, the material to be polished also moves in the direction along the central axis of the rotating shaft 24, and as a result, the material to be polished moves in the vertical and horizontal directions. It will be subjected to stirring polishing action. Therefore, the present invention can be applied to cases where the polishing container 23 and rotating shaft 24 are not tilted, that is, when the rotating shaft 24 is installed horizontally, and when the rotating shaft 24 is installed vertically.

(Effects of the Invention) As described above, according to the present invention, the inner circumferential surface of the polishing container is formed into a spherical shape such as a true sphere, an ellipsoidal sphere, and a ζ polyhedron, and the rotation of the polishing member causes the polishing chamber to be Since the material to be polished is stirred and polished while moving in the horizontal and vertical directions, when the material to be polished is stirred in the polishing chamber by the polishing member, it may collide with the inner circumferential surface of the polishing container. In other words, it will collide with the inclined or curved inner peripheral surface. As a result, the raw material to be polished is agitated and polished while repeatedly moving horizontally and vertically, and the frictional polishing action between the raw materials occurs frequently per unit time, making the fineness of the polishing even more noticeable. This resulted in a significant improvement in polishing efficiency. Since the polishing efficiency has been improved, it has become possible to significantly save the time and power required for stirring polishing work. Furthermore, by tilting the rotation axis, the above-mentioned movement of the material to be polished in the horizontal and vertical directions becomes significant, and an increase in the polishing action is achieved.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing a ball mill according to an embodiment of the present invention, and FIGS. 2 to 4 are force diagrams showing the stirring and polishing force applied to the raw material to be polished in the ball mill shown in FIG. 1. , FIG. 5 is a cross-sectional view showing a ball mill according to another embodiment of the present invention, FIG. 6 is a cross-sectional view showing a ball mill according to still another embodiment of the present invention, and FIG. 7 is a cross-sectional view showing a conventional ball mill. It is a diagram. 21... Casing of the device main body, 22... Pedestal part,
23... Polishing container, 24... Rotating shaft, 26... Motor (rotating means), 35-37... Polishing member, 38...
...Inner wall, 39...Outer wall, 45...Polishing room.

Claims (2)

[Claims] (1) A polishing container having a polishing chamber inside and into which the raw material to be polished is poured is provided with a rotating shaft, and a plurality of polishing members extending in the outer diameter direction of the rotating shaft are fixed to the rotating shaft; A rotating means is connected to the rotating shaft, and the inner peripheral surface of the polishing container is formed into a spherical shape such as a true sphere, an elliptical sphere, a polyhedron, etc., and the raw material to be polished in the polishing chamber is rotated by rotating the polishing member. A ball mill characterized in that the ball mill is agitated and polished while moving in the horizontal and vertical directions. (2) The ball mill according to claim 1, wherein the rotation axis is set at an arbitrary inclination angle between a vertical direction and a horizontal direction.