Solid material comminution or disintegration – Apparatus – Loose grinding body comminutor
Reexamination Certificate
1999-03-12
2001-04-24
Husar, John M. (Department: 3725)
Solid material comminution or disintegration
Apparatus
Loose grinding body comminutor
C241S179000, C241S183000
Reexamination Certificate
active
06220536
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a milling machine which produces crushed stones by crushing an arbitrary ore through use of predetermined crushing members stored in a shell main unit, to a method of crushing an ore through use of the milling machine, and to a method of manufacturing the milling machine.
2. Description of the Related Art
In principle, a shell main unit of a conventional milling machine is formed into the shape of a hollow cylinder. A milling machine has a shell main unit of one of the below-described types intended for improving the efficiency of crushing ore by dropping and rotating grinding members provided in the shell main unit. For example, when the shell main unit is viewed from the side, an ore-feeder portion of the shell main unit is formed into the shape of a hollow cylinder, whereas an outlet portion of the shell main unit is formed into the shape of a hollow truncated cone tapered toward the direction of discharge. Another type of shell main unit has a reverse structure; namely, the ore-feeder portion of the shell main unit is formed into the shape of hollow truncated cone, whilst the outlet portion of the same is formed into the shape of a hollow cylinder. The grinding member is formed into the shape of a sphere or a deformed rectangular polyhedron.
The efficiency of crushing ore has been known to be improved by uniform and balanced distribution of grinding members within the shell main unit. The reason for this is that uniform distribution of grinding members results in crushing action uniformly acting on ore, thereby enabling excessive crushing of ore and energy loss. Since the amount of crushing energy to be dissipated is proportional to the size of a substance to be crushed, crushing action is uniformly exerted on ore by uniform distribution of crushing members, thereby improving the quality of crushed stones.
However, in the milling machine which has conventionally been utilized, the shape of the milling machine makes attainment of uniform distribution of crushing members within the shell main unit difficult. For this reason, the conventional milling machine experiences difficulty in greatly improving the efficiency of crushing ore and is apt to cause excessive crushing of ore.
SUMMARY OF THE INVENTION
Accordingly, the object of the present invention is to provide a milling machine which enables an improvement in an efficiency of crushing ore through uniform distribution of grinding members within a shell main unit and an improvement in the quality of crushed stones by prevention of excessive crushing of ore.
More specifically, according to a first aspect of the present invention, there is provided a milling machine for crushing ore into crushed stones comprising:
a hollow shell main unit which rotates about a rotation axis, wherein the shell main unit further includes
a first hollow cylindrical section which is disposed on an ore supply side of the shell main unit and is tapered such that the inner diameter thereof becomes greater toward the ore supply side, and
a second hollow cylindrical section which is disposed on the ore outlet-port side, is tapered such that the inner diameter thereof becomes greater toward the ore supply side, and has an internal space continuing from the first cylindrical section.
In this milling machine, the shell main unit assumes the foregoing shape, grinding members can be uniformly distributed within the entire shell main unit. Accordingly, the efficiency of crushing the ore can be improved to a much greater extent, thereby enabling a reduction in energy loss.
Preferably, the cone angle of the second cylindrical section is greater than the cone angle of the first cylindrical section. Since the first cylindrical section is tapered, the grinding members can be prevented from accumulating in a specific location of the first cylindrical section. Since the cone angle of the second cylindrical section is greater than that of the first cylindrical section, crushed stone and the grinding members are conveyed to the crushed-stone-outlet side through utilization of a difference in peripheral speed arising from rotation of the shell main unit, thereby enabling effective output of the ore to the outside. Accordingly, ore to be conveyed is prevented from accumulating in a connection section between the first cylindrical section and the second cylindrical section, thereby enabling uniform arrangement of the grinding members.
Preferably, the cone angle of the first cylindrical section is very small, and the cone angle of the second cylindrical section is significantly larger than that of the first cylindrical section. As a result, the ore and the milling members can be distributed more uniformly within the entire shell main unit. In other words, since the first cylindrical section assumes a very small cone angle, the grinding members can be uniformly distributed without accumulating in a specific location. Since the cone angle of the second cylindrical section is made so as to become significantly larger than that of the first cylindrical section, the crushed ore and the grinding members are conveyed to the outlet side through utilization of a difference in peripheral speed arising from rotation of the shell main unit, thereby effectively outputting the ore to the outside. Accordingly, the ore to be conveyed is prevented from accumulating in a connection section between the first cylindrical section and the second cylindrical section, thereby rendering the grinding members more uniform.
The large grinding members and the large pieces of ore concentrate in the first cylindrical section. In the second cylindrical section, the grinding members and the pieces of ore are uniformly arranged so as to become smaller in diameter toward the crushed-stone-outlet side. Therefore, the first cylindrical section provides the grinding members and the ore with the maximum drop and peripheral speed. Since the ore is crushed by the grinding members of large diameters, the ore is crushed with maximum physical impact. In the second cylindrical section, the grinding members and the pieces of ore become gradually smaller in drop and peripheral speed toward the crushed-stone-outlet side. The ore is crushed by the grinding members having smaller diameters, thereby preventing excessive crushing of the ore and resulting in an improvement in quality of crushed stones.
Preferably, the longitudinal center of the shell main unit resides in the first cylindrical section. As a result of the cylindrical section tapered with a very small cone angle being made longer than the cylindrical section tapered with a significantly large cone angle, the ore and the grinding members are prevented from accumulating in the vicinity of the exit of the shell main unit, which would otherwise be caused by an excessive increase in the efficiency of discharge.
Preferably, the ratio between the cone angle of the first cylindrical section and the cone angle of the second cylindrical section and the ratio between the axial length of the first cylindrical section and the axial length of the second cylindrical section are set such that the grinding members achieve a substantially uniform distribution within the shell main unit. Consequently, uniform distribution of the grinding members within the shell main unit enables improvement in the efficiency of crushing ore, as well as improvement in the quality of crushed stone.
Preferably, a liner is provided on the internal wall surface of the first and second cylindrical sections in the shell main unit. As a result, the efficiency of crushing ore can be improved in association with uniform distribution of the grinding members within the shell main unit.
Preferably, the milling machine further comprising: an ore storage section for storing ore which is to be fed; an ore conveying section for conveying the ore stored in the ore storage section to the shell main unit; at least a pair of outer ring members provided around the outer periphery of the shell main unit; and a drive apparatus fo
Isaji Kazutoshi
Kudo Yorizo
Mori Tsukasa
Birch & Stewart Kolasch & Birch, LLP
Husar John M.
Shinwa Plant Kikou Co., Ltd.
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