US3589628A

US3589628A - Rotary shell pulverizer

Info

Publication number: US3589628A
Application number: US779367A
Authority: US
Inventors: Allen S Jackson; Albert E Henderson Jr
Original assignee: FERTILIZER EQUIPMENT SALES COR
Current assignee: FERTILIZER EQUIPMENT SALES COR
Priority date: 1968-11-27
Filing date: 1968-11-27
Publication date: 1971-06-29
Anticipated expiration: 1988-06-29

Abstract

The pulverizer includes a rotary shell or drum which is mounted for rotation on a slightly tilted axis, and in which materials, including fertilizer chemicals and the like, are fed in a solid state to the interior of the drum for comminution. The inside curved surface of the drum is provided with a continuous array of small cups or flights for receiving deposits of larger particles of material received and which carry them to an upper portion of the drum when rotated for emptying therefrom. The drum has covers for the ends of the drum and openings in the center for receiving material at the one end and for spilling it from the other end. Particles dropped from the inclined flights on the upturning side of the drum are passed to a breaker means for pulverizing the material. Large particles that remain are collected at the bottom and are received in the inclined flights for again passing to the breaker means, and the tilt of the drum together with the length thereof provide many passes of the material through the breaker until all material spilled from the exit cover end is finely comminuted.

Description

United States Patent Allen S. Jackson Atlanta, Ga.;

Albert E. Henderson, ,Ir., Jacksonville, Fla. [21] Appl. No. 779,367

[22] Filed Nov. 27, 1968 [72] Inventors [45] Patented June 29, 1971 [73] Assignee Fertilizer Equipment Sales Corporation Doraville, Ga.

[54] ROTARY SHELL PULVERIZER 2,732,136 1/1956 Brewster ABSTRACT: The pulverizer includes a rotary shell or drum which is mounted for rotation on a slightly tilted axis, and in which materials, including fertilizer chemicals and the like, are fed in a solid state to the interior of the drum for comminution. The inside curved surface of the drum is provided with a continuous array of small cups or flights for receiving deposits of larger particles of material received and which carry them to an upper portion of the drum when rotated for emptying therefrom. The drum has covers for the ends of the drum and openings in the center for receiving material at the one end and for spilling it from the other end. Particles dropped from the inclined flights on the upturning side of the drum are passed to a breaker means for pulverizing the material. Large particles that remain are collected at the bottom and are received in the inclined flights for again passing to the breaker means, and the tilt of the drum together with the length thereof provide many passes of the material through the breaker until all material spilled from the exit cover end is finely comminuted.

PATENTEU JUN29I97i FIG. 3

FIG. 6

ALLEN s. JACKSON INVENTORS FIG. 5

FIG. 4

ALBERT E. HENDERSON, JR.

ayw/z w ATTORN Y9 ROTARY SHELL PULVERIZER The present invention relates to an improved rotary shell pulverizer for pulverizing chemical materials and other articles in solid state, and more particularly the invention relates to a construction in which a rotary drum is slightly tilted and of sufficient length to provide many passes of large particles through a classifying stage in repeated passes until the particles are comminuted, collected at an intermediate point of a bed and spilled from the exit cover of the drum.

The primary object of the invention therefore is to provide a continual classifying action of material being pulverized so that the large particles are repeatedly fed to the pulverizing device at a uniform rate.

A further object of the invention is to provide a breaking device means in rotary shell pulverizers for breaking on impact, and to collect oversized material for repassing or recirculating to the breaking device means, while intermediate and finely divided material is spilled from the pulverizer drum.

An additional advantage of the invention is that the drum is accessible for cleaning while operating.

A further advantage of the invention is that since the flights feed the breaker means at a constant rate and since the material overflows out of the discharge end of the drum at approximately the same rate that it enters the drum, no overload due to fluctuation can occur in the pulverizer arrangement of the invention.

The above and other objects and advantages of the invention will become apparent upon full consideration of the following detailed description and accompanying drawings in which:

FIG. 1 is a perspective view of a rotary pulverizer drum according to a preferred embodiment and best mode of the invention;

FIG. 2 is a side elevation view of the exterior of such drum shown in FIG. 1;

FIG. 3 shows an end view from the exit cover of the manner in which pulverized spill is taken from the drum;

FIG. 4 is a cross-sectional view taken along line 4-4 of FIG.

FIG. 5 is a cross-sectional view taken along line 55 of FIG. 2; and

FIG. 6 is a cross-sectional view taken along line 6-6 of FIG. 2

' Referring now to the drawings, there is shown a particle breaker 10 in which there is a rotary drum 12 which is adaptable for mounting upon a frame (not shown) in a slightly tilted arrangement for orientation, as shown in FIG. 2. The drum is provided with an end cover at each end, and the feed end cover 14 is provided with a circular opening 16 so that the drum is adapted to receive large particles fed thereto. The other end cover is the exit end cover 18, shown in FIG. 3, and it has a circular opening for spilling out comminuted material.

Within the drum and onthe circular inner side of the drum, there are disposed a continuous array of small blades or flights 20 that cup or carry large particles that are received therein and, due to the overlying bed 22 of material, the large particles are carried within the blades upward in a clockwise direction, as shown in FIGS. 4, 5, and 6, so that the large particles are dropped upon a breaker means, for example, a chain array breaker means 26, which is mounted upon a shaft 28 shown in FIG. 1, and is driven by any drive means (not shown). The breaking device or chain breaker means 26, for example, may be any fast revolving set of chains impacting against the material, or it may be a breaking or hammer set or a pair of rollers for crushing the material disposed between them, or a set of reciprocating jaws for crushing the material that is fed to it. Material is fed to the breaker means by the emptying of the flights which are disposed on the drum as it rotates. The flights are tilted at an angle to best deposit the material in the breaking means, and the flights are used to lift the larger particles that have concentrated near the bottom of the bed 22 and are collected in the flights 20. As the drum rotates in its clockwise direction, the flights retaining the larger material reach a top position, such as at 30, and the flights then empty so that the material is poured upon the breaker means 26, and as a result of the breaking, the particles are broken into smaller components which are then collected upon the bed 22. Due to the upturning side of the drum 12, the

bed 22 of materials is such that the larger particles concentrate near the shell of the drum for being again received in the inclined deposits of the flights, while small particles collect and concentrate at an intermediate or central portion of the bed 22 so that when the bed traverses from the upper to the lower end of the drum 12, the finely divided and small particles of the material at the intermediate portion of the bed 22 spill out through the exit end cover 18 in accordance with the invention. Thus, the spill from the exit end cover is constant in volume where the feed of the material is constant when fed into the feed cover end 14 of the drum.

The drum 12 is of sufficient length and is adequately tilted to provide many passes of the material being comminuted so that the many passes of the material through the drum and being applied to the breaker means results in substantially complete and efficient breaking of the material without overload to the rotary shell pulverizer.

The uniform feed of the breaking device or pulverizer means is accomplished by the rotating drum and the breaker means, irrespective of the feed load applied to the drum.

Described above is the manner in which the small flights 20 pick up material near the periphery and at the bottom of the bed and drop the larger particles into the breaker device 26 at or near the top of the drum 12. Thus the material applied to the rotating drum for pulverizing results in a natural classifying action in the rolling drum for causing the larger particles to concentrate near the shell and at the bottom of the bed for being received in the flights 20 and being discharged at point 30 as the drum rotates in its clockwise direction. The small particles that have been pulverized tend to collect at the intermediate portion of the bed for being spilled out of the drum in the material flow 40, as shown in FIG. 3.

Additional embodiments of the invention in this specification will occur to others and therefore it is intended that the scope of the invention be limited only by the appended claims and not by the embodiment described hereinabove. Accordingly, reference should be made to the following claims in determining the full scope of the invention.

I claim: I

1. A pulverizer comprising a rotating cylindrical drum having its axis slightly inclined to the horizontal, a cover for each end of the drum, each cover having a central substantially circular opening of a diameter substantially less than that of the drum, so that an annular flange surrounding each opening is provided, the upper opening being adapted to receive material to be pulverized and the lower opening being adapted to discharge pulverized material from the drum, a continuous array of small flights attached to the inner surface of the drum, extending longitudinally thereof and inclined to receive deposits of larger particles, carry them up the ascending side of the drum and drop them, and a breaker means mounted in the path of such dropped particles, for breaking them into smaller particles, said breaker being located in the upper portion of the drum and being arranged to drop the broken particles in to the lower portion thereof.

2. A pulverizer as in claim I wherein the breaker is located closer to the descending side of the drum than to the ascending side, so that the larger particles are carried by the flights beyond the top position before being dropped.

3. A pulverizer as in claim 2 wherein the drum is of such a length that the larger particles make several passes through the breaking means in passing from one end of the drum to the other.

4. A pulverizer as in. claim 2 wherein the breaking means comprises a set of rotating chains.

5. A pulverizer as in claim 4 wherein said chains are mounted on a shaft extending longitudinally of the drum and rotatable on an axis above and on the descending side of the drum from the axis on which the drum rotates.

6. A pulverizer as in claim 5 wherein the flights are impreforate.

Claims

2. A pulverizer as in claim 1 wherein the breaker is located closer to the descending side of the drum than to the ascending side, so that the larger particles are carried by the flights beyond the top position before being dropped.

4. A pulverizer as in claim 3 wherein the breaking means comprises a set of rotating chains.

6. A pulverizer as in claim 5 wherein the flights are impreforate.