JP2004298834A - Ball mill - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ball mill which can control or prevent the accumulation of balls on the side of an outlet or the discharge of the balls outside the machine and can smoothly discharge crushed pieces (product) of a size similar to that of the balls outside the machine. <P>SOLUTION: The ball mill is shaped in a horizontal cylinder rotated around the axis and has a drum 1 in which one end is closed by an end wall 1b having a supply port 2 and the other end is closed by an end wall 1c having a discharge opening 3 and a ball movement controlling/preventing means 5 which is installed on the inner circumference of the drum and controls/prevents only the movement of the balls moving from one end toward the other end of the drum. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a ball mill using balls as a grinding medium, and more particularly, to a cylindrical ball mill.
[0002]
[Prior art]
Conventionally, a cylindrical ball mill has a horizontal cylindrical shape that is rotated around an axis, a drum having one end closed by an end wall provided with a supply port, and a drum closed at the other end by an end wall provided with a discharge port, and a drum. The ball is provided with a great for preventing the discharge of the ball provided at the discharge port of the drum. The ball, which is lifted and dropped by the impact, is crushed by the impact force of the ball, which moves to the discharge port side to reach the discharge port, and only the crushed material (product) having a small particle size through the great aperture passes through the great and out of the drum. While the ball having a diameter larger than the great aperture is not discharged.
On the other hand, the pulverized material discharged out of the drum is sieved to a desired particle size by a discharge trommel connected to the other end of the drum as necessary.
[0003]
[Problems to be solved by the invention]
However, the conventional ball mill can be applied only when the material to be ground is crushed using a ball having a diameter much larger than the desired product particle size. There is a problem that cannot be applied when crushing objects.
That is, the object to be crushed is composed of hard minerals to be collected as a product (for example, diamond ore) and unnecessary soft minerals (for example, soft stones and clay), which have a particle size similar to the diameter of the ball, When only the soft mineral is pulverized and separated without pulverizing the hard mineral, for example, when the object to be pulverized containing the hard ore having a particle size of about 20 mm is pulverized using a ball having a diameter of about 30 mm, the hard mineral as a product is obtained. Cannot pass through the gap between the balls, and the drum becomes full of hard minerals and becomes clogged.
[0004]
Therefore, the present invention can suppress or prevent accumulation of balls on the outlet side or discharge of balls to the outside of the machine, and can smoothly discharge crushed products (products) having a size similar to the balls to the outside of the machine. It is an object to provide a ball mill.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, the ball mill of the present invention has a horizontal cylindrical shape that is rotated around an axis, and one end is provided by an end wall provided with a supply port, and the other end is provided by an end wall provided with a discharge port. It is characterized by comprising a closed drum and ball movement suppressing / blocking means provided on the inner periphery of the drum and for suppressing or preventing only the movement of the ball from one end to the other end.
[0006]
The ball movement suppressing / preventing means is formed in a spiral shape continuously or intermittently on the inner periphery of the drum, and is a band plate having a base portion separated from the inner periphery or a band plate-shaped punching plate having the base portion in contact with the inner periphery. It is preferably metal.
The ball movement suppressing / preventing means is provided in a plurality of rings in a continuous or intermittent ring shape on the inner periphery of the drum, and a circular plate having an outer periphery separated from the inner periphery or a circle having an outer periphery in contact with the inner periphery. A circular plate-shaped punching metal may be used.
Further, the ball movement suppressing / blocking means is provided on the inner periphery of the drum with a plurality of projecting protrusions in the form of a ring intermittently inclined with respect to the direction of rotation, and the base is separated from the inner periphery or brought into contact with the inner periphery. It may be a punched metal having a shape of a plate or a fan-shaped plate.
[0007]
[Action]
In the ball mill according to the present invention, the ball which tends to move toward the discharge port together with the crushed object as the crushed object is crushed is suppressed or prevented by the ball movement suppressing / blocking means.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1, 2, 3, and 4 are respectively a vertical sectional view showing a first embodiment of a ball mill according to the present invention, a view taken along a line II-II in FIG. 1, and a line III-III in FIG. 1. FIG. 4 is a sectional view taken along line IV-IV of FIG. 1.
[0009]
In the figure, reference numeral 1 denotes a drum having a horizontal cylindrical shape. The drum 1 is closed at one end (the right end in FIG. 1) of a cylindrical drum main body 1a by an end wall 1b provided with a supply port 2 at a central portion, Further, the other end is closed by a circular plate-shaped end wall 1c provided with a relatively large discharge port 3, and the inner periphery of the drum main body 1a is prevented from being worn, and the rotation of the drum 1 is prevented. A ball as a grinding medium and a liner 4 (see FIG. 3) for lifting a material to be ground (both not shown) are attached, and only movement of the ball (not shown) from one end to the other end is performed. A ball movement suppressing / blocking means 5 for suppressing or blocking is provided.
The ball movement suppressing / preventing means 5 is formed of a band plate 5b projecting spirally from the inner periphery of the drum 1 and having a base portion appropriately separated from the inner periphery via a plurality of columns 5a.
The ball movement suppressing / blocking means 5 is not limited to a continuous spiral, but may be an intermittent spiral.
Further, the ball movement suppressing / blocking means 5 is not limited to the strip 5b whose base is separated from the inner periphery of the drum 1, but is not shown in the drawing, and is formed in a spiral shape continuously or intermittently formed on the inner periphery of the drum 1. It may be made of a band-shaped punching metal having a base portion abutting on the inner periphery.
Further, it is desirable that the gap between the drum 1 and the strip 5b and the opening of the punched metal be adjusted to be larger than the desired product particle size and smaller than the ball size.
[0010]
Wheels (tires) 6 are concentrically mounted on the outer circumference of both ends of the drum 1 at appropriate distances from the outer circumference, and a ring-shaped driven gear 7 is concentrically mounted on the outer circumference of one end of the drum 1. It is attached in a shape.
The drum 1 is supported via the respective ring members 6 by four support rollers 9 disposed on the base 8 so as to correspond to the two ring members 6 in the longitudinal direction of the drum 1 and in a direction orthogonal thereto. It is rotatably provided around the axis, and is prevented from moving in the longitudinal direction by four holding rollers 10 arranged on the base 8 so as to hold the two metal wheels 6 at the lowermost portion from both sides. The driving gear 11 mounted on the base 8 in conjunction with a rotation driving device (not shown) is engaged with the driven gear 7 so as to be rotatable.
[0011]
Outside the end wall 1c at the other end of the drum 1, the crushed material (product) is sieved from the ball and discharged, and the diameter is reduced toward the tip (the left end in FIG. 1) in order to suppress the discharge of the ball. A discharge trommel 12 having a tapered shape (e.g., a taper angle of 2 to 45 degrees) is connected to the discharge port 3 and is provided continuously through a base end portion. And a size larger than the particle size of the supplied material to be ground.
Also, outside the end wall 1c at the other end of the drum 1, the product sieved from the discharge trommel 12 is received, collected and discharged at one place, so that the diameter increases toward the tip (the left end in FIG. 1). A product collecting / discharging cylinder 13 composed of a circular plate-shaped end wall 13b provided at the distal end of the cylindrical portion 13a so as to surround the outer periphery of the tapered cylindrical portion 13a and the distal end of the discharge trommel 12, concentrically surrounds the outer periphery of the discharge trommel 12. A plurality of product outlets 14 for discharging fine particles are provided at the distal end of the cylindrical portion 13a of the product collecting and discharging cylinder 13 so as to surround the product.
On the other hand, the tip of the discharge trommel 12 is mainly used to collect the ball that could not be returned due to the taper of the discharge trommel 12 and to perform inspection and maintenance in the event that the discharge trommel 12 is clogged. An overflow discharge tube 15 is provided continuously.
[0012]
In FIG. 1, reference numeral 16 denotes a product discharge chute for discharging the product discharged from the product discharge port 14 of the product collecting / discharging cylinder 13, and 17 denotes a ball discharge chute for discharging the ball discharged from the overflow discharge cylinder 15. Reference numeral 18 denotes a cover for covering the driven gear 6 and the driving gear 11.
[0013]
In the ball mill having the above-described configuration, in order to perform pulverization in a state in which the particle size of the pulverized material (product) and the diameter of the ball are relatively close, a required amount of the ball is accommodated in the drum 1, and then the rotation driving device is operated. When the drum 1 is rotated in the direction of the arrow A in the figure and the crushed object is supplied from the supply port 2, the crushed object is crushed by the impact force of the ball which is lifted and dropped by the rotation of the drum 1 and is discharged by the discharge port. The product moves to the third side to reach the discharge trommel 12, where the product is sieved and discharged out of the machine via the product collecting discharge tube 13 and the product discharge chute 16.
On the other hand, the ball is lifted up by the liner 4 and then guided by the band plate 5b of the ball movement suppressing / blocking means 5 and falls while returning to the supply port 2 side of the drum 1.
Therefore, the ball is prevented from being discharged from the overblow discharge tube 15 at the tip of the discharge trommel 12 to the outside of the machine.
[0014]
FIG. 5 is a longitudinal sectional view showing a second embodiment of the ball mill according to the present invention.
The ball mill according to the first embodiment described above has a spiral projection continuously or intermittently on the inner periphery of the drum 1 in order to suppress or prevent only the movement of the ball from one end of the drum 1 to the other end. The ball movement suppressing / preventing means 5 is provided, which is made of a band plate 5b whose base is separated from the inner periphery via a plurality of pillars 5a or a band-shaped punching metal whose base is in contact with the inner periphery. On the other hand, in order to suppress or prevent only the movement of the ball from one end of the drum 1 to the other end, a plurality of rings are protruded from the drum 1 so as to be continuous with the inner periphery of the drum 1, and the outer periphery is formed through a plurality of columns 19 a. A ball movement suppressing / blocking means 19 comprising a circular plate 19b spaced from the periphery is provided.
The ball movement suppressing / blocking means 19 is not limited to a continuous ring shape, but may be an intermittent ring shape.
The ball movement suppressing / preventing means 19 is not limited to the annular plate 19 b having the outer peripheral edge separated from the inner periphery of the drum 1, but is not shown, but is formed in a ring shape continuous or intermittent with the inner periphery of the drum 1. It may be made of a circular plate-shaped punching metal that is protruded and has an outer peripheral edge in contact with the inner periphery.
The other configuration and operation and effect are almost the same as those of the first embodiment described above, and therefore, the same components and the like are denoted by the same reference numerals and description thereof is omitted.
[0015]
6 and 7 are a development view of a main part showing a third embodiment of the ball mill according to the present invention, and an enlarged sectional view taken along line VII-VII in FIG.
This ball mill suppresses or prevents only the movement of the ball from one end of the drum 1 to the other end. Therefore, the ball mill according to the first embodiment described above spirally projects continuously or intermittently on the inner circumference of the drum 1. Ball movement suppressing / preventing means 5 made of a band plate 5b whose base is separated from the inner periphery through a plurality of columns 5a or a band-shaped punching metal whose base is in contact with the inner periphery; In the second embodiment, a plurality of ring-shaped plates 19b each having a plurality of ring-shaped projections continuously or intermittently provided on the inner periphery of the drum and having an outer periphery separated from the inner periphery by a plurality of columns 19a or an outer periphery. While the ball movement suppressing / preventing means 19 made of a circular plate-shaped punching metal whose peripheral edge is in contact with the inner circumference is provided, the rotation direction (radial direction; arrow A in FIG. ) And an appropriate inclination (for example, 2 to 8). °) is allowed to a plurality of strip projecting ring intermittently, is provided with a ball movement inhibiting and blocking means 20 consisting of fan face shape plate 20b that is spaced apart from the inner periphery of the base via a plurality of struts 20a.
The ball movement suppressing / preventing means 20 is not limited to the fan-shaped plate 20b whose base is separated from the inner periphery of the drum 1, but is not shown, but is appropriately inclined with respect to the rotation direction on the inner periphery of the drum 1. It may be made of a fan-shaped plate-shaped punching metal projecting in a plurality of intermittent ring shapes and having a base portion in contact with the inner periphery.
The arrangement of the ball movement suppressing / blocking means 20 is not limited to the illustrated one, but may be freely arranged (for example, staggered).
Other configurations and operational effects are almost the same as those of the first and second embodiments described above, and therefore, the same components and the like are denoted by the same reference numerals and description thereof is omitted.
[0016]
In each of the above embodiments, the case where the discharge trommel 12 is connected to the other end of the drum 1 has been described. However, a ball mill without the discharge trommel 12 may be used.
Further, the case where the discharge trommel 12 has a tapered shape whose diameter is reduced toward the tip has been described. However, the present invention is not limited to this, and the discharge trommel may have a straight cylindrical shape or a tapered shape whose diameter is increased toward the tip. Good.
Further, the sieving of the product and the ball is not limited to the trommel, and a product in which a plurality of grade bars are arranged in a cylindrical shape may be used as the sieving means.
Further, the instruction of the drum 1 is not limited to the tire support system, but may be a trunnion support system.
[0017]
【The invention's effect】
As described above, according to the ball mill of the present invention, the ball moving toward the discharge port together with the crushed object along with the crushing of the crushed object is prevented from moving by the ball movement suppressing / blocking means. Since the ball is suppressed or prevented, the accumulation of the ball on the outlet side or the discharge of the ball to the outside of the machine can be suppressed or prevented, and the crushed material (product) similar in size to the ball can be smoothly out of the machine. Can be discharged.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a first embodiment of a ball mill according to the present invention.
FIG. 2 is a view taken along line II-II in FIG.
FIG. 3 is a sectional view taken along line III-III in FIG.
FIG. 4 is a sectional view taken along line IV-IV in FIG. 1;
FIG. 5 is a longitudinal sectional view showing a second embodiment of the ball mill according to the present invention.
FIG. 6 is a development view of a main part of a ball mill according to a third embodiment of the present invention.
FIG. 7 is an enlarged sectional view taken along line VII-VII in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Drum 1a Drum main body 1b End wall 1c End wall 2 Supply port 3 Discharge port 5 Ball movement suppressing / blocking means 5a Column 5b Strip 19 Ball movement suppressing / blocking means 19a Column 19b Ring plate 20 Ball movement suppressing / blocking means 20a Prop 20b Fan-shaped plate

Claims (4)

A drum having a horizontal cylindrical shape that is rotated around an axis and having one end closed by an end wall provided with a supply port and the other end closed by an end wall provided with a discharge port, and provided on an inner periphery of the drum; And a ball movement suppressing / blocking means for suppressing or preventing only the movement of the ball from one end to the other end. The ball movement suppressing / preventing means is helically protruded continuously or intermittently on the inner periphery of the drum, and a band plate having a base portion separated from the inner periphery or a band plate-shaped punching plate in which the base portion is in contact with the inner periphery. 2. The ball mill according to claim 1, wherein the ball mill is metal. A plurality of the ball movement suppressing / blocking means are protruded in a ring shape continuous or intermittent on the inner periphery of the drum, and a circular plate having an outer periphery separated from the inner periphery or a circle having an outer periphery in contact with the inner periphery. 2. The ball mill according to claim 1, wherein the ball mill is a wheel-shaped punching metal. A fan-shaped plate in which a plurality of the ball movement suppressing / inhibiting means are protruded from the inner periphery of the drum in a ring shape intermittently inclined with respect to the rotation direction, and the base is separated from the inner periphery or abuts against the inner periphery. 2. The ball mill according to claim 1, wherein the ball mill is a fan-shaped plate-shaped punching metal.

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