KR20100120112A

KR20100120112A - Ball mill with guide plate

Info

Publication number: KR20100120112A
Application number: KR1020100104301A
Authority: KR
Inventors: 홍성민
Original assignee: 홍성민
Priority date: 2010-10-25
Filing date: 2010-10-25
Publication date: 2010-11-12

Abstract

Ball mills contain metal balls or stones in the cylinders, which are crushed by smashing and rubbing when they are turned and put in objects to break or pulverize. There is a limitation of the grinding efficiency of the existing ball mill. As the ball mill rotates faster, the ball mill rotates along the inner wall of the ball mill, which limits the rotation speed of the ball mill. The present invention is intended to remove the rotation speed limit of the ball mill. A curved guide plate is installed inside the ball mill to guide the ball along the inner wall of the ball due to the rapid rotation of the ball mill.
do. If the guide plate is curved, the impact of the ball and the guide plate is minimized to give maximum impact when dropped to the bottom of the ball mill. Then, space is placed on the guide plate and the inner wall of the ball mill, and as time passes, finely broken materials adhere to the inner wall and rotate. This allows the ball to continue to impact later on with crushed material, resulting in finer results than the basic ball mill.

Description

Ball mill with guide plate

Ball mills are one of the grinders, which contain metal balls or stones in the cylinders that are crushed or crushed when they are turned into objects that will break or pulverize. Ball mill generally

A pulverizer refers to pulverizing a material by using the force of gravity and the mass of a force ball of centrifugal force. The driving principle of the ball mill grinder is that as the ball mill rotates in the ball mill grinder, the balls in the drum move up along the inner wall of the ball mill due to the centrifugal force. Basically, the ball mill grinder is used to grind and mix raw materials in various ranges such as pharmaceutical industry, food industry and chemical industry using this principle.

1 is a cross-sectional view showing a rotating drum of the guide plate ball mill.
Figure 2 is a cross-sectional view of Figure 1
3 is a side view of FIG. 1
<Explanation of symbols for main parts of drawing>
(1,7) Bolt
(2) Guide plate fixing bolt
(3) support
(4) guide plate shaft
(21) Guide board, shaft connecting pin
(5) ball
(16) Guide plate angle adjuster
(6,10,12,17) Bearings
(8) Curved guide
(9) Space between drum and guide board
(11) drum shaft
(13) motor
(14) Curved Guide Plate Angle Adjustment Pin
(15) Drum
(18) ball mill lid
(19) Drum center
(20) Drum inner wall
(a) Upper part of the information board
(A) bottom of the sign

[Issue to solve]

Physical factors that can increase the efficiency of the ball mill include the length of the grinder drum inner diameter, the mass of the ball, rotational force, gravity. Above all, the most effective way to increase the efficiency of the ball mill grinder is to speed up the rotation of the drum. However, if the drum rotation speed rises above the threshold, the centrifugal force causes the ball of the grinder and the material to be broken along the inner wall of the drum, resulting in extremely low efficiency. As such, the existing ball mill grinder has a limitation in that it cannot raise the rotation rate of the drum barrel more than the threshold and thus cannot effectively grind.

[Contents of invention (draft)]

When the rotational force reaches a certain threshold, the grinding force of the general ball mill reaches its limit. The ball rotates along the drum's inner wall due to the rotational force. When the guide plate is mounted on the ball mill by improving the general ball mill, it is not affected by the ball mill's limit torque. By installing a curved guide plate in the ball mill and turning it along the inner wall of the ball due to the rapid rotation of the ball mill, the ball falls along the guide plate to the bottom of the ball mill. If the guide plate is curved, the impact of the ball and the guide plate is minimized to give maximum impact when dropped to the bottom of the ball mill. The increase in rotational force improves the grinding ability of the ball, thereby increasing the physical impact of the ball and the material to be crushed.

The operation principle of the conventional ball mill is one of the grinders that are crushed by the physical impact between the ball and the material to be crushed by rotating the drum by putting a material stronger than the material to be crushed in the drum. There are many ways to increase the grinding efficiency of this ball mill. Increasing the size of the drum to increase the fall time to increase the physical force, increase the ball mill operating time, increase the weight of the ball, or increase the speed of the drum. The best way to increase the grinding efficiency is to increase the speed of the ball to increase the physical impact. However, to increase the speed of the ball, there is a way to increase the rotational speed of the drum, which is due to the characteristics of the ball mill can not increase the rotational speed of the drum more than a certain point.

When the rotation speed of the drum is increased, at some point or more, the ball and the material to be crushed rotate along the inner wall of the drum. If so, the grinding efficiency of the ball mill will be extremely low.

This invention is provided with the curved guide plate 8.

The key in this figure is the curved guide plate 8. The curved guide plate 8 is connected with the guide plate axis 4.

The curved guide plate 8 and the guide plate shaft 4 are connected and fixed to each other by the guide plate and the shaft fixing pin 21. The guide plate and the shaft fixing pin 21 are elliptical in order to minimize the impact with the ball 5. It is.

The guide plate shaft 4 is connected to bearings 12 and 17 on both sides.

The drum 15 and the drum shaft 11 are connected, and the drum shaft 11 is connected to the motor 13.

As the motor 13 rotates, the drum 15 rotates, and the curved guide plate 8 and the guide plate shaft 4 are fixed by guide plate fixing bolts 2 located outside the drum. Even if the drum rotates due to the bearings 12 and 17, the curved guide plate 8 may be fixed without being rotated. Therefore, even if the drum 15 rotates at a high speed, the ball that rotates along the inner wall due to the fixed guide plate 8 falls to the central portion 19 under the drum.

Here, the curved guide plate 8 is curved because the physical impact is applied at the moment when the ball 5 that has rotated along the inner wall meets the curved guide plate 8. The physical impact with the material to be destroyed will drop significantly. The curved guide plate 8 is curved to minimize the impact of the ball 5 and the guide plate and to maximize the physical impact between the ball and the material to be broken.

The curved guide plate 8 removes the curved guide plate angle adjusting pin 14, removes the curved guide plate angle adjuster 16, removes the ball mill lid 18, and pulls out the curved guide plate 8 to remove the drum 15. ) Can be separated.

When the curved guide plate 8 is separated from the drum 15, the foreign matter adhered to the curved guide plate 8 can be wiped off after using the ball mill.

In addition, the curved guide plate 8 and the guide plate shaft 4 can be separated from each other, so that the type and curve angle of the curved guide plate 8 can be changed and adjusted separately later.

Bolts (1), (7) is a device for fixing the drum lid (18). The support 3 secures the drum 15 and the curved guide plate 8 without tilting it. The guide plate angle adjuster 16 moves left and right to adjust the angle of the curved guide plate 8 in the drum to fix the curved guide plate angle. The pin 14 may be fixed to adjust the grinding efficiency according to the angle. The material of the curved guide plate 8 also selects a material stronger than the ball 5 to prevent deformation of the curved guide plate 8 and the ball 5 during the operation of the ball mill. For material selection, for example, if the ball 5 is selected as ordinary steel, the curved guide plate 8 is selected as heat-treated steel.

And the basic ball mill does not pulverize any more after the crushing to some extent when a large amount of material to be crushed. This is because the material to be crushed is concentrated in the drum central portion 19, and the ball 5 and the crushed material are accumulated to some extent, so that the impact is alleviated. The space 9 is a space between the curved guide plate 8 and the inner wall 20, which is a slight space 9 although it will vary depending on the size of the ball mill.

When the ball mill finely pulverizes the material, the material does not accumulate in the center of the drum 19 between the spaces 9 and rotates together along the drum inner wall 20, and the ball 5 is again driven by the curved guide plate 8. While falling to the drum center 19, the fine material that has rotated along the drum inner wall 20 may be pulverized more finely again. This is much faster and finer grinding than conventional ball mills.

Claims

Guide plate-type ball mill in which the curved guide plate 8 is mounted on the cylindrical drum 15 so that the drum rotates and falls under the influence of the curved guide plate 8, thereby being crushed by the impact of the grinding material and the ball.

Guide plate-type ball mill of the curved guide plate 8 is made of a material stronger than the ball in 1

Curved guide plate (8) in the paragraph 1 is a guide plate-type ball mill that minimizes the impact between the ball (5) and the curved guide plate (8) and maximizes the grinding efficiency

Curved guide plate 8 is a guide plate-type ball mill that can adjust the closing position of the ball (5) and the curved guide plate (8) by the guide plate angle adjuster (16)