CA2040749A1 - Rake sorter - Google Patents
Rake sorterInfo
- Publication number
- CA2040749A1 CA2040749A1 CA002040749A CA2040749A CA2040749A1 CA 2040749 A1 CA2040749 A1 CA 2040749A1 CA 002040749 A CA002040749 A CA 002040749A CA 2040749 A CA2040749 A CA 2040749A CA 2040749 A1 CA2040749 A1 CA 2040749A1
- Authority
- CA
- Canada
- Prior art keywords
- cylinder
- particles
- rake
- teeth
- sorter according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B13/00—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices
- B07B13/003—Separation of articles by differences in their geometrical form or by difference in their physical properties, e.g. elasticity, compressibility, hardness
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B13/00—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices
- B07B13/04—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices according to size
Landscapes
- Combined Means For Separation Of Solids (AREA)
Abstract
ABSTRACT
The rake sorter is used to sort particles according to size or shape. It comprises a hollow cylinder rotatable about its axis and arranged with its axis inclined to the horizontal such that particulate material fed into the upper end of the cylindermoves along the bottom of the cylinder towards its lower end as the cylinder rotates. Raking teeth project inwardly from the wall of the cylinder, the teeth being configured to rake through the moving particles and to capture selected particles which are distinguished from other particles by their size or shape for subsequent collection apart from the other particles.
The rake sorter is used to sort particles according to size or shape. It comprises a hollow cylinder rotatable about its axis and arranged with its axis inclined to the horizontal such that particulate material fed into the upper end of the cylindermoves along the bottom of the cylinder towards its lower end as the cylinder rotates. Raking teeth project inwardly from the wall of the cylinder, the teeth being configured to rake through the moving particles and to capture selected particles which are distinguished from other particles by their size or shape for subsequent collection apart from the other particles.
Description
nRAKE SORTER"
BACKGROUND TO THE INVENTION
THIS invention relates to a rake sorter and to a method of sorting particulate material according to size or shape.
It is frequently necessary to separate particles in accordance with their size or shape. For instance, in the mineral processing industry, crushed ore may containsmall lengths of copper wire resulting from underground blasting operations. Before accurate sorting of the ore particles is implemented it would clearly be desirable to remove such lengths of copper wire, the shape of which provides a ready sorting criterion. In another example, it may be necessary to separate particles into fractions composed of particles having different sizes. Conventionally this would be done using sieves, but the problem with sieves is that they are prone to blinding.
There are many other applications in which it would be desirable to separate particles into fractions in accordance with their external shape or size.
^3 -SUMrL~RY OF THE INV~NTION
A first aspect of the invention provides a rake sorter for sorting particles according to size or shape, the rake sorter comprising a hollow cylinder rotatable about its axis and arranged with its axis inclined to the horizontal such that particulatematerial fed into the upper end of the cylinder moves along the bottom of the cylinder towards its lower end as the cylinder rotates, and a plurality of raking teeth projecting inwardly from the wall of the cylinder, the teeth being configured to rake through the moving particles and to capture selected particles which are distinguished from other particles by their size or shape for subsequent collection apart from the other particles.
A collector is preferably located inside the cylinder for collPcting captured particles that are discharged gravitationally by the teeth after having been lifted upwardly from the bottom of the cylinder. The collector is stationary or in the form of amovable conveyor, typically a movable conveyor belt.
In one configuration, the raking teeth are arranged in parallel, axially extending rows on the inner surface of the wall of the cylinder. In another configuration, the raking teeth are arranged in spiral rows on the inner surface of the wall of thecylinder. The raking teeth may be fixed rigidly or resiliently to the inner surface of the wall of the cylinder.
To promote longitudinal orientation of elongate particles which it is desired tocollect, the inner surface of the cylinder wall at the upstream end of the cylinder may be longitudinally grooved. Alternatively, a portion of the length of the cylinder wall, at the upstream end thereof, carries no raking teeth.
The invention extends to a rake sorter of:the kind surnmarised above with a single cylinder, different groups of raking teeth arranged at different axial positions along the length of the cylinder, the raking teeth in each group being configured to select different classes of particles distinguished by size or shape, and a plurality of collectors for collecting particles selected by each group of raking teeth.
A second aspect of the inventis)n provides a rake sorting apparatus which comprises a plurality of rake sorters as summarised above arranged in series with the configurations of the teeth in the rake sorters being chosen to capture and remove different selected particles from the initial particle feed.
A third aspect of the invention provides a method of sorting particles according to size or shape, the method comprising the steps of causing the particles to move through a hollow cylinder while the cylinder is rotated about its axis, such that inwardly directed teeth on the wall of the cylinder rake through the particles and collecting, apart from other particles, particles that are captured by the teeth.
BRIEF DESCRIPrlON OF THE DR~WINGS
The invention will. now be described in more detail, by way of example only, with reference to the accompanying diagrammatic drawings in which:
Figure 1 shows a side view of a rake sorter of the invention;
Figure 2 shows a cross-section at the line 2-2 in Figure 1;
Figures 3a and 3b show how certain particles are captured by the raking teeth;
Figure 4 shows another embodiment of rake sorter; and igures 5a, Sb and Sc show how different particles are captured by the rake sorter of Figure 4.
DESCRIPIION OF EMBODIMENTS
Referring to Figure 1, there is shown a rake sorter of the invention. The rake sorter has a hollow cylinder 10 which is round in cross-section and which is arranged with its axis 12 inclined at an acute angle to the horizontal. Means (not illustrated) are provided for rotating the cylinder about its axis 12 at a preselected speed.
Arranged adjacent the upper end of the cylinder 10 is a feed hopper 16 containing particulate material which is to be sorted in the rake sorter. The feed hopper 16 discharges the particles into the upper end of the cylinder. The speed of rotation of the cylinder and its inclination to the horizontal are chosen such that the particles 18 accumulate at the bottom of the cylinder as indicated in Figure 2 and move to the lower end of the cylinder under gravity as the cylinder rotates.
' Fixed either rigidly or resiliently to the inner surface of the cylinder wall is a great number of raking teeth 20, typically in the form of short lengths of steel wire. In Figures 1 and 2, the teeth are straight, but other shapes, such as curved or hook-shaped are also possibilities. The straight raking teeth 20 of Figures 1 and 2 are oriented radially in four longitudinally extending rows.
The rake sorter of Figures 1 and 2 is designed to remove from the particulate feed elongate rods or bodies, such as lengths of copper wire, elongate slivers of timber or the like which may be incorporated in the feed. In this application, the constant spacing of the raking teeth 20 in each row is greater than the maximum dimensionof the other particles in the ~eed and less than half the expected lengths of the pieces of elongate rods or bodies which it is desired to remove.
Mounted inside the cylinder by means of a stationary support structure (not shown) is a stationary collector 22 in the form of a shallow tray having upturned longitudinal edges. The collector 22 is inclined to the horizontal at the same angle as the cylinder itself and its elevation corresponds to that of the cylinder axis.
With a suitably high angle of inclination, say 5, of the cylinder relative to the horizontal it will be appreciated that longer particles in the feed will orientate themselves longitudinally on the bottom of the cylinder and will move towards the lower end of the cyli~der at this orientation. The raking teeth 20 rake transversely through the moving stream of particles at the bottom of the cylinder. It will beappreciated that those particles having a relevant dimension less than the longitudinal spacing between the teeth will remain largely unaffected by the passing of the teeth through the stream. However, those particles in the stream, such as any lengths of wire, which have a relevant dimension greater than twice the tooth spacing will be captured by the teeth as illustrated by Figure 3A.
It w~ll also be appreciated that some other particles having a relevant dimension that is merely greater than the tooth spacing, but not twice the tooth spacing, may also be captured if the ends of the particle extend beyond adjacent teeth, as illustrated by Figure 3b.
The captured particles are lifted up by the teeth, as the cylinder continues to rotate, until they are eventually obliged to fall under gravity from the teeth and into the collector 22 Thus the selected particles, in this case lengths of copper wire or the like, are collected by the collector 22 while other uncaptured particles continue rnoving inside the cylinder for eventual discharge into a bin 26 adjacent to the lower end of the cylinder. Of course, this embodiment is not suitable only for separating lengths of wire, but also other particles distinguishable by their larger dimensions, such as slivers of timber or the like.
To improve the longitudinal orientation of the wires or other elongate particles in the cylinder, the surface of the cylinder in the vicinity of its upper çnd may be longitudinally grooved. Alternatively or in addition, there may be a substantiallength of cylinder which carries no teeth near to the feed end, to give elongateparticles sufficient time to orientate themselves longitudinally before they reach the teeth 20. Where the majority of particles fed to the rake sorter have small sizes, a small diameter cylinder can be used to promote correct longitudinal orientation of the elongate particles.
Also, with a view to preventing agglomeration of particles and promoting smooth and uniform flow through the cylinder, it would be possible to spray liquid, such as water, onto the particles in the cylinder.
Figure 4 shows another embodiment of the invention in which the raking teeth arearranged in spiral rows instead of straight rows as in Figure 1. The rake sorter of Figure 4 may be used to separate selected plate shaped particles from other particles in the feed, assuming of course that the correct tooth spacing is employed.
This is illustrated by Figure 5a which shows how an elongate rod-shaped particle30 that is initially captured by a tooth will, unless perfectly balanced, tilt over and eventually fall down between two adjacent teeth on a spiral. Small blocky particles 32 (Figure Sb) will also fall between adjacent teeth. On the other hand, a generally flat plate-shaped particle 34 will in many cases be captured by the teeth even if it tilts over, as illustrated in Figure 5c. Naturally the tooth spacing and helix angle will be important in each particular application.
It will be seen in Figures 1 and 4 that the collector 22 projects beyond the end of the cylinder 10 and discharges collected particles under gravity into a bin 27 located above the collector 26.
As an alternative to the stationary collector 22 described above, it would be possible to provide a collector in the form of a moving conveyor inside the cylinder 10. The conveyor could, for instance, be a moving conveyor belt positioned to collect on its upper run particles that fall under gravity from the teeth. The conveyor would discharge into a suitable receptacle or bin outside the cylinder 10.
The invention contemplates a particle sorting apparatus comprising a rake sorterof the kind seen in Figures 1 and 2 and a rake sorter of the kind seen in Figure 4 arranged in series to deal sequentially with the same initial feed. In the first rake sorter, with teeth arranged in straight rows, elongate rod-shaped particles are collected in the collector 22 in the manner described above for lengths of wire. At the same time, plate-shaped particles having appropriate minimum dimensions are also collected on the collector 22. Smaller, blocky particles are not captured by the teeth and are collected at the lower end of the cylinder in the bin 26. The rod- and plate-shaped particles collected on the collector 22 are then fed to the second rake sorter with spirally arranged teeth. Here, the plate-shaped particles are collected by the collector æ while the rod-shaped particles report at the lower end of the cylinder. Thus the initial feed can, with appropriate tooth spacings, effectively be divided into three fractions composed essentially of small, blocky particles, plate-shaped particles and elongate particles.
Instead of sequentially arranged rake sorters as just described, it would be possible to provide a single cylinder in which two different tooth configurations are provided in different sections along the length of the cylinder and in which each section is provided with its own collector 22. Naturally a greater degree of selectivity can be attained by using a greater number of different tooth configurations and collectors.
BACKGROUND TO THE INVENTION
THIS invention relates to a rake sorter and to a method of sorting particulate material according to size or shape.
It is frequently necessary to separate particles in accordance with their size or shape. For instance, in the mineral processing industry, crushed ore may containsmall lengths of copper wire resulting from underground blasting operations. Before accurate sorting of the ore particles is implemented it would clearly be desirable to remove such lengths of copper wire, the shape of which provides a ready sorting criterion. In another example, it may be necessary to separate particles into fractions composed of particles having different sizes. Conventionally this would be done using sieves, but the problem with sieves is that they are prone to blinding.
There are many other applications in which it would be desirable to separate particles into fractions in accordance with their external shape or size.
^3 -SUMrL~RY OF THE INV~NTION
A first aspect of the invention provides a rake sorter for sorting particles according to size or shape, the rake sorter comprising a hollow cylinder rotatable about its axis and arranged with its axis inclined to the horizontal such that particulatematerial fed into the upper end of the cylinder moves along the bottom of the cylinder towards its lower end as the cylinder rotates, and a plurality of raking teeth projecting inwardly from the wall of the cylinder, the teeth being configured to rake through the moving particles and to capture selected particles which are distinguished from other particles by their size or shape for subsequent collection apart from the other particles.
A collector is preferably located inside the cylinder for collPcting captured particles that are discharged gravitationally by the teeth after having been lifted upwardly from the bottom of the cylinder. The collector is stationary or in the form of amovable conveyor, typically a movable conveyor belt.
In one configuration, the raking teeth are arranged in parallel, axially extending rows on the inner surface of the wall of the cylinder. In another configuration, the raking teeth are arranged in spiral rows on the inner surface of the wall of thecylinder. The raking teeth may be fixed rigidly or resiliently to the inner surface of the wall of the cylinder.
To promote longitudinal orientation of elongate particles which it is desired tocollect, the inner surface of the cylinder wall at the upstream end of the cylinder may be longitudinally grooved. Alternatively, a portion of the length of the cylinder wall, at the upstream end thereof, carries no raking teeth.
The invention extends to a rake sorter of:the kind surnmarised above with a single cylinder, different groups of raking teeth arranged at different axial positions along the length of the cylinder, the raking teeth in each group being configured to select different classes of particles distinguished by size or shape, and a plurality of collectors for collecting particles selected by each group of raking teeth.
A second aspect of the inventis)n provides a rake sorting apparatus which comprises a plurality of rake sorters as summarised above arranged in series with the configurations of the teeth in the rake sorters being chosen to capture and remove different selected particles from the initial particle feed.
A third aspect of the invention provides a method of sorting particles according to size or shape, the method comprising the steps of causing the particles to move through a hollow cylinder while the cylinder is rotated about its axis, such that inwardly directed teeth on the wall of the cylinder rake through the particles and collecting, apart from other particles, particles that are captured by the teeth.
BRIEF DESCRIPrlON OF THE DR~WINGS
The invention will. now be described in more detail, by way of example only, with reference to the accompanying diagrammatic drawings in which:
Figure 1 shows a side view of a rake sorter of the invention;
Figure 2 shows a cross-section at the line 2-2 in Figure 1;
Figures 3a and 3b show how certain particles are captured by the raking teeth;
Figure 4 shows another embodiment of rake sorter; and igures 5a, Sb and Sc show how different particles are captured by the rake sorter of Figure 4.
DESCRIPIION OF EMBODIMENTS
Referring to Figure 1, there is shown a rake sorter of the invention. The rake sorter has a hollow cylinder 10 which is round in cross-section and which is arranged with its axis 12 inclined at an acute angle to the horizontal. Means (not illustrated) are provided for rotating the cylinder about its axis 12 at a preselected speed.
Arranged adjacent the upper end of the cylinder 10 is a feed hopper 16 containing particulate material which is to be sorted in the rake sorter. The feed hopper 16 discharges the particles into the upper end of the cylinder. The speed of rotation of the cylinder and its inclination to the horizontal are chosen such that the particles 18 accumulate at the bottom of the cylinder as indicated in Figure 2 and move to the lower end of the cylinder under gravity as the cylinder rotates.
' Fixed either rigidly or resiliently to the inner surface of the cylinder wall is a great number of raking teeth 20, typically in the form of short lengths of steel wire. In Figures 1 and 2, the teeth are straight, but other shapes, such as curved or hook-shaped are also possibilities. The straight raking teeth 20 of Figures 1 and 2 are oriented radially in four longitudinally extending rows.
The rake sorter of Figures 1 and 2 is designed to remove from the particulate feed elongate rods or bodies, such as lengths of copper wire, elongate slivers of timber or the like which may be incorporated in the feed. In this application, the constant spacing of the raking teeth 20 in each row is greater than the maximum dimensionof the other particles in the ~eed and less than half the expected lengths of the pieces of elongate rods or bodies which it is desired to remove.
Mounted inside the cylinder by means of a stationary support structure (not shown) is a stationary collector 22 in the form of a shallow tray having upturned longitudinal edges. The collector 22 is inclined to the horizontal at the same angle as the cylinder itself and its elevation corresponds to that of the cylinder axis.
With a suitably high angle of inclination, say 5, of the cylinder relative to the horizontal it will be appreciated that longer particles in the feed will orientate themselves longitudinally on the bottom of the cylinder and will move towards the lower end of the cyli~der at this orientation. The raking teeth 20 rake transversely through the moving stream of particles at the bottom of the cylinder. It will beappreciated that those particles having a relevant dimension less than the longitudinal spacing between the teeth will remain largely unaffected by the passing of the teeth through the stream. However, those particles in the stream, such as any lengths of wire, which have a relevant dimension greater than twice the tooth spacing will be captured by the teeth as illustrated by Figure 3A.
It w~ll also be appreciated that some other particles having a relevant dimension that is merely greater than the tooth spacing, but not twice the tooth spacing, may also be captured if the ends of the particle extend beyond adjacent teeth, as illustrated by Figure 3b.
The captured particles are lifted up by the teeth, as the cylinder continues to rotate, until they are eventually obliged to fall under gravity from the teeth and into the collector 22 Thus the selected particles, in this case lengths of copper wire or the like, are collected by the collector 22 while other uncaptured particles continue rnoving inside the cylinder for eventual discharge into a bin 26 adjacent to the lower end of the cylinder. Of course, this embodiment is not suitable only for separating lengths of wire, but also other particles distinguishable by their larger dimensions, such as slivers of timber or the like.
To improve the longitudinal orientation of the wires or other elongate particles in the cylinder, the surface of the cylinder in the vicinity of its upper çnd may be longitudinally grooved. Alternatively or in addition, there may be a substantiallength of cylinder which carries no teeth near to the feed end, to give elongateparticles sufficient time to orientate themselves longitudinally before they reach the teeth 20. Where the majority of particles fed to the rake sorter have small sizes, a small diameter cylinder can be used to promote correct longitudinal orientation of the elongate particles.
Also, with a view to preventing agglomeration of particles and promoting smooth and uniform flow through the cylinder, it would be possible to spray liquid, such as water, onto the particles in the cylinder.
Figure 4 shows another embodiment of the invention in which the raking teeth arearranged in spiral rows instead of straight rows as in Figure 1. The rake sorter of Figure 4 may be used to separate selected plate shaped particles from other particles in the feed, assuming of course that the correct tooth spacing is employed.
This is illustrated by Figure 5a which shows how an elongate rod-shaped particle30 that is initially captured by a tooth will, unless perfectly balanced, tilt over and eventually fall down between two adjacent teeth on a spiral. Small blocky particles 32 (Figure Sb) will also fall between adjacent teeth. On the other hand, a generally flat plate-shaped particle 34 will in many cases be captured by the teeth even if it tilts over, as illustrated in Figure 5c. Naturally the tooth spacing and helix angle will be important in each particular application.
It will be seen in Figures 1 and 4 that the collector 22 projects beyond the end of the cylinder 10 and discharges collected particles under gravity into a bin 27 located above the collector 26.
As an alternative to the stationary collector 22 described above, it would be possible to provide a collector in the form of a moving conveyor inside the cylinder 10. The conveyor could, for instance, be a moving conveyor belt positioned to collect on its upper run particles that fall under gravity from the teeth. The conveyor would discharge into a suitable receptacle or bin outside the cylinder 10.
The invention contemplates a particle sorting apparatus comprising a rake sorterof the kind seen in Figures 1 and 2 and a rake sorter of the kind seen in Figure 4 arranged in series to deal sequentially with the same initial feed. In the first rake sorter, with teeth arranged in straight rows, elongate rod-shaped particles are collected in the collector 22 in the manner described above for lengths of wire. At the same time, plate-shaped particles having appropriate minimum dimensions are also collected on the collector 22. Smaller, blocky particles are not captured by the teeth and are collected at the lower end of the cylinder in the bin 26. The rod- and plate-shaped particles collected on the collector 22 are then fed to the second rake sorter with spirally arranged teeth. Here, the plate-shaped particles are collected by the collector æ while the rod-shaped particles report at the lower end of the cylinder. Thus the initial feed can, with appropriate tooth spacings, effectively be divided into three fractions composed essentially of small, blocky particles, plate-shaped particles and elongate particles.
Instead of sequentially arranged rake sorters as just described, it would be possible to provide a single cylinder in which two different tooth configurations are provided in different sections along the length of the cylinder and in which each section is provided with its own collector 22. Naturally a greater degree of selectivity can be attained by using a greater number of different tooth configurations and collectors.
Claims (18)
1.
A rake sorter for sorting particles according to size or shape, the rake sorter comprising a hollow cylinder rotatable about its axis and arranged with its axisinclined to the horizontal such that particulate material fed into the upper end of the cylinder moves along the bottom of the cylinder towards its lower end as thecylinder rotates, and a plurality of raking teeth projecting inwardly from the wall of the cylinder, the teeth being configured to rake through the moving particles and to capture selected particles which are distinguished from other particles by their size or shape for subsequent collection apart from the other particles.
A rake sorter for sorting particles according to size or shape, the rake sorter comprising a hollow cylinder rotatable about its axis and arranged with its axisinclined to the horizontal such that particulate material fed into the upper end of the cylinder moves along the bottom of the cylinder towards its lower end as thecylinder rotates, and a plurality of raking teeth projecting inwardly from the wall of the cylinder, the teeth being configured to rake through the moving particles and to capture selected particles which are distinguished from other particles by their size or shape for subsequent collection apart from the other particles.
2.
A rake sorter according to claim 1 and comprising a collector inside the cylinder for collecting captured particles that are discharged gravitationally by the teeth after having been lifted upwardly from the bottom of the cylinder.
A rake sorter according to claim 1 and comprising a collector inside the cylinder for collecting captured particles that are discharged gravitationally by the teeth after having been lifted upwardly from the bottom of the cylinder.
3.
A rake sorter according to claim 2 wherein the collector is stationary.
A rake sorter according to claim 2 wherein the collector is stationary.
4.
A rake sorter according to claim 2 wherein the collector is in the form of a movable conveyor.
A rake sorter according to claim 2 wherein the collector is in the form of a movable conveyor.
5.
A rake sorter according to claim 4 wherein the conveyor comprises a movable conveyor belt.
A rake sorter according to claim 4 wherein the conveyor comprises a movable conveyor belt.
6.
A rake sorter according to claim 2 and comprising a bin into which the collectordischarges under gravity.
A rake sorter according to claim 2 and comprising a bin into which the collectordischarges under gravity.
7.
A rake sorter according to claim 1 and comprising a bin into which non-selected particles are discharged from the lower end of the cylinder.
A rake sorter according to claim 1 and comprising a bin into which non-selected particles are discharged from the lower end of the cylinder.
8.
A rake sorter according to claim 1 wherein the raking teeth are arranged in parallel, axially extending rows on the inner surface of the wall of the cylinder.
A rake sorter according to claim 1 wherein the raking teeth are arranged in parallel, axially extending rows on the inner surface of the wall of the cylinder.
9.
A rake sorter according to claim 1 wherein the raking teeth are arranged in spiral rows on the inner surface of the wall of the cylinder.
A rake sorter according to claim 1 wherein the raking teeth are arranged in spiral rows on the inner surface of the wall of the cylinder.
10.
A rake sorter according to claim 1 wherein the raking teeth are fixed rigidly to the inner surface of the wall of the cylinder.
A rake sorter according to claim 1 wherein the raking teeth are fixed rigidly to the inner surface of the wall of the cylinder.
11.
A rake sorter according to claim 1 wherein the raking teeth are fixed resiliently to the inner surface of the wall of the cylinder.
A rake sorter according to claim 1 wherein the raking teeth are fixed resiliently to the inner surface of the wall of the cylinder.
12.
A rake sorter according to claim 1 wherein the raking teeth are straight, curved or hook-shaped.
A rake sorter according to claim 1 wherein the raking teeth are straight, curved or hook-shaped.
13.
A rake sorter according to claim 1 wherein the inner surface of the cylinder wall at the upstream end of the cylinder is longitudinally grooved.
A rake sorter according to claim 1 wherein the inner surface of the cylinder wall at the upstream end of the cylinder is longitudinally grooved.
14.
A rake sorter according to claim 1 wherein a portion of the length of the cylinder wall, at the upstream end thereof, carries no raking teeth.
A rake sorter according to claim 1 wherein a portion of the length of the cylinder wall, at the upstream end thereof, carries no raking teeth.
15.
A rake sorter according to claim 1 comprising a single cylinder, different groups of raking teeth arranged at different axial positions along the length of the cylinder, the raking teeth in each group being configured to select different classes of particles distinguished by size or shape, and a plurality of collectors for collecting particles selected by each group of raking teeth.
A rake sorter according to claim 1 comprising a single cylinder, different groups of raking teeth arranged at different axial positions along the length of the cylinder, the raking teeth in each group being configured to select different classes of particles distinguished by size or shape, and a plurality of collectors for collecting particles selected by each group of raking teeth.
16.
A rake sorting apparatus which comprises a plurality of rake sorters according to claim 1 arranged in series with the configurations of the teeth in the rake sorters being chosen to capture and remove different selected particles from the initialparticle feed.
A rake sorting apparatus which comprises a plurality of rake sorters according to claim 1 arranged in series with the configurations of the teeth in the rake sorters being chosen to capture and remove different selected particles from the initialparticle feed.
17.
A rake sorter according to claim 1 wherein means are provided to spray liquid onto the particles in the cylinder to disagglomerate particles that are wet or damp.
A rake sorter according to claim 1 wherein means are provided to spray liquid onto the particles in the cylinder to disagglomerate particles that are wet or damp.
18.
A method of sorting particles according to size or shape, the method comprising the steps of causing the particles to move through a hollow cylinder while the cylinder is rotated about its axis, such that inwardly directed teeth on the wall of the cylinder rake through the particles and collecting, apart from other particles, particles that are captured by the teeth.
A method of sorting particles according to size or shape, the method comprising the steps of causing the particles to move through a hollow cylinder while the cylinder is rotated about its axis, such that inwardly directed teeth on the wall of the cylinder rake through the particles and collecting, apart from other particles, particles that are captured by the teeth.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ZA90/2957 | 1990-04-19 | ||
| ZA902957 | 1990-04-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2040749A1 true CA2040749A1 (en) | 1991-10-20 |
Family
ID=25580083
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002040749A Abandoned CA2040749A1 (en) | 1990-04-19 | 1991-04-18 | Rake sorter |
Country Status (3)
| Country | Link |
|---|---|
| AU (1) | AU641749B2 (en) |
| CA (1) | CA2040749A1 (en) |
| GB (1) | GB2243093B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT2514U1 (en) * | 1997-12-17 | 1998-12-28 | Burgstaller Gmbh H | SCREEN DRUM FOR DRUM SCREENING MACHINE |
| CN103482364A (en) * | 2013-09-29 | 2014-01-01 | 瓮福紫金化工股份有限公司 | Coal dust filter unit of boiler ribbon conveyor |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1075779A (en) * | 1965-07-19 | 1967-07-12 | James Donald Cota | Bean separator |
| GB1299445A (en) * | 1969-08-22 | 1972-12-13 | Keith Toule | Improvements in or relating to apparatus for harvesting root crops |
| DD142798A3 (en) * | 1976-03-30 | 1980-07-16 | Hans Jarausch | SIEVING DEVICE FOR PLASTIC GRANULATE |
| AT395549B (en) * | 1989-02-02 | 1993-01-25 | Evg Entwicklung Verwert Ges | DEVICE FOR FEEDING A GRID WELDING MACHINE WITH LENGTH ELEMENTS |
-
1991
- 1991-04-18 CA CA002040749A patent/CA2040749A1/en not_active Abandoned
- 1991-04-19 AU AU75159/91A patent/AU641749B2/en not_active Ceased
- 1991-04-19 GB GB9108380A patent/GB2243093B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| GB2243093A (en) | 1991-10-23 |
| GB9108380D0 (en) | 1991-06-05 |
| AU641749B2 (en) | 1993-09-30 |
| AU7515991A (en) | 1991-10-24 |
| GB2243093B (en) | 1993-12-01 |
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