KR100801990B1 - Ball mill pulverization drum that use basalt - Google Patents

Abstract

A ball mill crushing drum using basalt is provided to improve crushing efficiency and to prevent damage on a lining by preventing objects and balls from directly bumping against the lining of the drum. A ball mill crushing drum(D) using basalt includes an outer cylinder(10) forming the exterior shape of the ball mill crushing drum; a fixed case(20) detachably installed at the inner peripheral surface of the outer cylinder by a combining unit(40) and provided with a receiving groove formed on one surface; and a drum lining(30) contained and fixed in the receiving groove of the fixed case together with mortar(31), made of basalt of a block unit, and provided with an uneven part(32) comprising protruded and recessed portions formed on the inner surface.

Description

Ball mill pulverization drum that use basalt

1 is a block diagram showing a ball mill grinding drum using a barzalt according to the present invention as a whole.

Figure 2 is a longitudinal cross-sectional view showing the internal structure of the grinding drum shown by cutting the line AA 'of FIG.

3 is an enlarged block diagram of the main portion of FIG.

4A is a schematic illustration of a drum lining for calculating ball deviation angles

4b is a schematic illustration of a drum lining showing the motion trajectory of a ball

Explanation of symbols on the main parts of the drawings

10: outer cylinder 10a: fastener 20: fixed case

22: receiving groove 30: drum lining 31: mortar

32: uneven portion 32a: protrusion 32b: concave portion

34: buried protrusion 40: fastening means

The present invention relates to a ball mill grinding drum using a bazalt, and more particularly, by increasing the impact load of the ball and the grinding object accommodated in the grinding drum of the ball mill, and increasing the grinding efficiency by friction and impact of the ball and the grinding object. The present invention relates to a ball mill grinding drum using a bazalt which prevents damage to lining and prolongs the life of the grinding drum.

In general, a ball mill puts a grinding object such as an ore or cement material, coal, clinker, chemical industrial material, medicine, food, etc. of irregular size into a grinding drum with a ball, and then rotates it to finely collide with the grinding object and the ball. The grinding performance of the ball mill has a drastic difference depending on how the balance of the force composed of gravity and centrifugal force and frictional force acting on the grinding object and the ball is maintained.

Conventionally, the ball mill has a hollow cylindrical grinding drum rotatably supported at both ends by a pair of supports and rotated by a driving means, and installed on the inner surface of the grinding drum to rotate with the grinding drum to collide with the grinding object and the ball. Lining is provided. At this time, the lining of the ball mill was mainly made of structural steel, alumina material, and the grinding drum rotates, and the grinding object and the ball collide with the ball repeatedly, so that the life of the grinding drum is shortened.

Accordingly, Korea Utility Model Registration No. 20-319159 (name: lining for ball mill) installed lining made of butadiene rubber with high resistance to abrasion on the inner surface of ball mill drum, making it hard and bulky in ceramics. Techniques for preventing the wear and breakage of ball mill drums and for reducing noise when finely grinding large objects have been disclosed.

However, the above-described technology has provided a ball mill lining for reducing noise and prolonging the life of the ball mill drum when grinding the grinding object, but many problems have been raised as follows.

First, since the lining is provided with a rubber material, the impact of the grinding object and the ball applied to the drum of the ball mill is partially absorbed, but the impact load is reduced, resulting in a decrease in the grinding performance.

Second, due to the wear of the lining is severe, the inspection has to be carried out from time to time, as well as the cumbersome disadvantages of replacing the worn lining individually, the maintenance was difficult.

Third, the lining is simply installed to protrude on the inner surface of the drum, so that the balance of gravity, centrifugal and friction forces acting on the grinding object and the ball as the grinding drum rotates is not considered at all, and the grinding object and the ball are simply mixed. Not only was the damage to the lining severe by friction, but also the long time required for complete grinding, resulting in a significant reduction in grinding efficiency.

Accordingly, the present invention has been made in view of the above point, and more specifically, the impact of the grinding object and the ball in consideration of the forces consisting of gravity and centrifugal force, frictional force acting on the grinding object and the ball while rotating the grinding drum of the ball mill Ball mill pulverization using a bazalt to improve the crushing efficiency and prevent damage to the lining by increasing the load and preventing the falling objects and balls from colliding directly with the lining of the grinding drum by drawing parabolic trajectories. It is an object to provide a drum.

In order to achieve the above object, the present invention comprises: an outer cylinder constituting the outer shape of the ball mill grinding drum (D); A fixing case 20 in which an accommodating groove 22 is formed while being detachably attached to the inner circumferential surface of the outer cylinder 10 through a fastening means 40; And a concave-convex portion which is received and fixed together with the mortar 31 in the receiving groove 22 of the fixing case 20, and is formed of a barzalt material in a block unit, and includes a protrusion part 32a and a concave part 32b on an inner surface thereof. It characterized in that it comprises a; (32) is provided with a drum lining (30).

At this time, the fastening means 40 is characterized in that the fastening hole (10a) is formed on the outer cylinder 10 corresponding to the fixed case 20 is fastened with the bolt (T).

In addition, the drum lining 30 is characterized in that the concave-convex buried protrusion 34 is formed on one surface to be bonded to the mortar 31.

In addition, the protrusion 32a of the drum lining 30 is characterized in that it is formed to be inclined at an inclination angle (α) of 3 ° ~ 15 °.

In addition, the drum lining 30 has an inclination angle α of the protrusion 32a located at the front portion, which is an inlet side of the grinding drum D, into which the grinding object A is introduced, and an inclination angle of the protrusion 32a at the rear portion thereof. It is formed smaller than ((alpha) '), It is characterized by the above-mentioned.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a configuration diagram showing a ball mill grinding drum using a bazalt according to the present invention as a whole, Figure 2 is a longitudinal cross-sectional view showing the internal configuration of the grinding drum shown by cutting the line AA 'of FIG. Is a block diagram showing the main part of FIG. 1 in an enlarged manner.

The present invention relates to a ball mill grinding drum using a bazalt, wherein the ball mill grinding drum using a bazalt is not shown in detail through the drawings, but is supported rotatably at both ends by a pair of supports, and driving means. Rotating by the inlet is formed at the end is the entrance to the grinding object (A) and the ball (B) is formed, the outer cylinder 10, the fixed case 20 to improve the grinding performance and to prevent damage to the grinding drum (D) during rotation , The drum lining 30 is characterized in that the main configuration.

The outer cylinder 10 according to the present invention constitutes an outer shape of the ball mill grinding drum D, and is formed of a metal material. The outer cylinder 10 is formed in the shape of a hollow circular steel tube, one end of the inlet for accommodating the grinding object (A) and the ball (B) is opened, it is rotated by the drive means with both ends installed on the support.

In addition, the fixing case 20 according to the present invention is provided on the inner circumferential surface of the outer cylinder 10 via a fastening means 40 to be detachably attached to the receiving groove 22. The fixing case 20 is formed in the shape of a metal box provided with a receiving groove 22 so that one side is opened to insert a part of the drum lining 30 to be described later, and the fastening means 40 are engaged with each other on the inner circumferential surface of the outer cylinder 10. Is fixed by.

At this time, the fastening means 40 is fastening hole (10a) is formed on the outer cylinder 10 corresponding to the fixed case 20 is fastened with the bolt (T). Fastening hole (10a) and the bolt (T) is provided in two or more locations at a spaced apart position so that the fixed case 20 is installed in the outer cylinder (10) and is firmly fixed without flow.

In addition, the drum lining 30 according to the present invention is accommodated and fixed together with the mortar 31 in the receiving groove 22 of the fixed case 20, formed of a block unit of bazalt material, the protrusions 32a on the inner surface. And the concave-convex portion 32 formed of the concave portion 32b is provided. The drum lining 30 is made of a basalt material produced by melting and casting basalt, which is a kind of volcanic rock, at a high temperature and then recrystallizing the tissue more precisely through a special heat treatment process. In the meantime, the uneven part 32 which consists of the protrusion part 32a and the recessed part 32b is integrally formed in one surface.

And when the drum lining 30 is inserted into the fixing case 20 is inserted and fixed with the mortar 31, where the drum lining 30 is one side of the receiving groove 22 of the some fixed case 20 Since the joint is inserted in the state to prevent the play by the left and right impact load.

In addition, the drum lining 30 is formed with a concave-convex buried portion 34 on one surface to be bonded to the mortar (31). The buried protrusion 34 is formed in a tooth shape as shown in FIGS. 1 and 2 to extend the joining area of the drum lining 30 and the mortar 31 as well as the buried protrusion 34 is embedded in the mortar 31. Since the joints are joined together, the bonding force of the joints is maintained firmly.

As described above, the drum lining 30 that is spoken to the inner circumferential surface of the outer cylinder 10 through the fixing case 20 is disposed between the protrusion 32a and the protrusion 32a of the uneven portion 32 when the grinding drum D rotates. It serves as a hopper to pull up in the state in which the grinding object (A) and the ball (B) is accommodated in the concave portion (32b) formed in the, and the grinding object (A) and the ball (B) is constant through the uneven portion (32) If it goes up to a height, it falls by drawing a parabolic trajectory by gravity, and at this time, the object to be crushed is crushed finely by the falling impact load.

Here, the protrusion 32a of the drum lining 30 is formed to be inclined at an inclination angle α of 3 ° to 15 °. This is a large position in the grinding object (A) and the ball (B) in consideration of the balance of gravity and centrifugal force and friction force acting when the drum lining (30) pulls up the falling object (A) and the ball (B) Protrusions 32a are formed at an inclination angle α of 3 ° to 15 ° to prevent damage of the uneven parts 32 of the drum lining 30 due to the impact when the energy falls while acting.

In more detail, when the inclination angle α of the protrusion 32a of the drum lining 30 is smaller than 3 °, the grinding object A and the ball B are raised to a position that is too high, so that the opposite drum is dropped when falling. If the concave-convex portion 32 is damaged by colliding with the lining 30, and larger than 15 °, the crushed object A and the ball B do not rise to a high position and slip and fall, so that large potential energy cannot be secured. .

In addition, the drum lining 30 has an inclination angle α of the protrusion 32a located at the front portion, which is an inlet side of the grinding drum D, into which the grinding object A is introduced, and an inclination angle of the protrusion 32a at the rear portion thereof. It is formed smaller than (α '). This is because the powder of the grinding object A is pushed backward by the grinding object A introduced through the inlet in the front part of the grinding drum D, so that the grinding object A on the uneven part 32 is not present. While the friction coefficient to be operated when the ball and the ball (B) falls, the grinding object (A) and the ball (B) at the rear of the grinding drum (D) due to the powder of the grinding object (A) pushed forward The friction coefficient acting when this falls increases.

Thus, the friction coefficient of the drum lining 30 and the grinding object (A) and the ball (B) acting in the front and rear sections of the grinding drum (D) is different from each other is installed in the front of the friction coefficient as shown in FIG. The inclination angle α of the protrusion 32a of the drum lining 30 is smaller than the inclination angle α 'of the protrusion 32a of another section, whereby the friction coefficient of the entire inner portion of the grinding drum D is kept constant so that the grinding performance This has the advantage of being improved.

The drum lining 30 of the present invention as described above is determined in consideration of the separation angle, the landing point of the ball (B), the friction coefficient of the grinding object (A) and the ball (B) and the basalt, the impact force, etc. It looks at with reference to Figures 4a to 4b.

Figure 4a is a schematic view of the drum lining for calculating the ball deviation angle of the drum lining of the present invention, Figure 4b is a schematic view of the drum lining showing the motion trajectory of the ball.

First, the take-off angle (TAKE-OFF ANGLE) is a ball (B) is pulled up by the recess 32b of the drum lining 30 as the drum lining 30 rotates, the ball (B) is concave at any height In this case, the angle between the straight line connecting the position where the ball B is separated from the center of the drum lining 30 and the horizontal axis of the drum lining 30 is referred to as a separation angle θ. One deviation angle is obtained through equations (1) and (2).

In Equation 1, α is the inclination angle of the protrusion 32a of the uneven portion 32, when the mass of the ball B is m, mg is gravity acceleration, r is the radius of the drum lining 30, w is the drum At the rotational angular velocity of the lining 30, mrw ² is the centrifugal force, mrw ² cosα is the component in the direction parallel to the inclined surface of the projection 32a, mrw ² sinα is the component in the direction perpendicular to the inclined surface, and μ is the coefficient of friction. When the force acting on the ball B becomes '0' as shown in Equation 1, the ball B is separated from the drum lining 30 to start a ballistic movement. In summary, equation (2). In FIG. 4A F is a frictional force.

On the other hand, there may be no departure angle (θ) that satisfies Equation (2), which is a case where the centrifugal force is too large in this case is not a subject of consideration of the present invention, the departure angle satisfies the above equation θ) is calculated through a computer program using the TRIAL AND ERROR METHOD.

The landing point of the ball is a landing point obtained when the ball B is separated from the uneven portion 32 at the above-described separation angle θ and the ballistic motion is performed according to the trajectory equation shown in Equation 3 above. Is indicated by a local coordinate system (LOCAL COORDINATES SYSTEM) starting from the point where the ball B leaves the drum lining 30 and starts ballistic motion.

In Equation 3, v ₀ is the initial velocity when the ball B is separated from the drum lining 30, and v ₀ = rw.

In order to find the point where the ball B hits the grinding object A when the grinding object A is filled about 1/3 of the drum lining 30 using Equation 3, the drum lining 30 In order to find the position of the ball (B) falling on the X-axis as the surface layer of the grinding object (A), which is filled about 1/3, substitute y = -rsinθ- (r / 3) in equation (3) and satisfy this. It is obtained by calculating x through a computer program using a test solution.

In addition, the friction coefficient of the bazalt constituting the grinding object A, the ball B, and the drum lining 30 is about 0.5-2, and the size thereof is somewhat changed by the vibration of the drum lining 30.

Considering these points, the above-mentioned drum lining 30 is inclined as indicated by the dotted line of FIG. 4B when the grinding object A filled about one third of the drum lining 30 rotates. If the landing point is too far, the landing point of the ball (B) should not be too far because it will hit the inner circumferential surface of the drum lining (30) without hitting the grinding object (A), causing damage to the drum lining (30). It can be guessed that the limit value, ie, the grinding object A, should _fall within about half of X _bnd , which is the point where the drum lining 30 meets.

If the friction coefficient of the rear part of the drum lining 30 is assumed to be 0.9 in consideration of the vibration of the cylinder, α = 12 ° is appropriate from the result calculated by Equations 1 to 3, and the deviation angle θ of the ball B is obtained. = 53.57 ° and the maximum height (height from the X axis) is Y _max = 3.17 m and landing point x = 1.25 m. At this time, the diameter of the drum lining 30 is 5.2m and the cylinder rotates at 12.6rpm.

On the other hand, the actual coefficient of friction is significantly different depending on the degree of vibration of the cylinder, the landing point is increased when the friction coefficient is increased, and the landing point is decreased when the friction coefficient is smaller, so that the inclination angle of the protrusion 32a of the drum lining 30 in consideration of these points Set to 3-15 °.

According to the above configuration and action, the present invention considers the forces consisting of gravity, centrifugal force and friction force acting on the grinding object and the ball while the grinding drum of the ball mill rotates to greatly increase the impact load of the grinding object and the ball, thereby improving grinding performance. It is effective.

In addition, since the friction coefficient of the entire inner portion of the grinding drum is kept constant, the impact load is evenly applied, thereby improving the grinding efficiency of the grinding object.

In addition, there is a useful effect that the grinding object and ball falling while drawing a parabolic trajectory does not directly collide with the drum lining to prevent damage to the irregularities.

Claims (5)

An outer cylinder constituting an outer shape of the ball mill grinding drum D; A fixing case 20 having a receiving groove 22 formed on one surface thereof while being detachably attached to the inner circumferential surface of the outer cylinder 10 through a fastening means 40; It is received and fixed together with the mortar 31 in the receiving groove 22 of the fixed case 20, and formed of a block unit of bazalt material and formed on the inner surface of the concave-convex portion 32a and the concave portion 32b ( 32 is provided with a drum lining (30); ball mill grinding drum using a basalt. The method of claim 1, The fastening means 40 is a ball mill grinding drum using a bazalt, characterized in that the fastening hole (10a) is formed on the outer casing (10) corresponding to the fixed case 20 to be fastened by a bolt (T). The method of claim 1, The drum lining 30 is a ball mill grinding drum using a bazalt, characterized in that the concave-convex buried protrusion (34) is formed on one surface to be bonded to the mortar (31). The method of claim 1, Protruding portion (32a) of the drum lining (30) is a ball mill grinding drum using a bassalt, characterized in that formed inclined at an inclination angle (α) of 3 ° ~ 15 °. The method of claim 4, wherein The drum lining 30 has an inclination angle α of the protrusion 32a in which the protrusion 32a located at the front side, which is the inlet side of the grinding drum D, into which the grinding object A is introduced. Ball mill grinding drum using the Bazalt, characterized in that formed smaller than ').

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