CA1122925A - Multi-projection belt conveyor in a suction sorting system - Google Patents
Multi-projection belt conveyor in a suction sorting systemInfo
- Publication number
- CA1122925A CA1122925A CA315,873A CA315873A CA1122925A CA 1122925 A CA1122925 A CA 1122925A CA 315873 A CA315873 A CA 315873A CA 1122925 A CA1122925 A CA 1122925A
- Authority
- CA
- Canada
- Prior art keywords
- belt
- stream
- suction
- particulate material
- multiplicity
- 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.)
- Expired
Links
Landscapes
- Belt Conveyors (AREA)
- Sorting Of Articles (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The invention provides a concentrating method in which a thin stream of particulate material is supported on a multiplicity of spaced projections projecting from an endless belt. The material is moved past at least one device for detecting specific types of particles in the material and then past a suction nozzle which removes the portions of the stream including the detected particles.
The invention provides a concentrating method in which a thin stream of particulate material is supported on a multiplicity of spaced projections projecting from an endless belt. The material is moved past at least one device for detecting specific types of particles in the material and then past a suction nozzle which removes the portions of the stream including the detected particles.
Description
~l'Z292S
THIS INVENTION relates to a concentrating method and apparatus of the type wherein selected portions of a stream of feed material are removed to provide a concentrate and a tails fraction.
Methods and apparatuses of this type are described in our co-pending Canadian Patent Applications Nos. 312,300 and 313,446 filed September 28, 1978 and October 13, 1978 respactively. Both of these applications disclose a method ! whereby a stream of particulate material is supported on a suitable belt and more particularly on a mesh belt. Select-ed portions are removed by a venturi-operated suction apparatus which is triggered by a suitable detection means, for example, X-ray detection in the case of diamond concentration.
An object of this invention is to provide an improvement to the above methods and apparatuses.
According to one aspect of the invention a concen-trating method comprises feeding a thin stream of particu-late materi.al past at least one particle detection device and suction nozzle and removing selected portions of the ~ b stream by rapidly applying sucti~n to the suction
THIS INVENTION relates to a concentrating method and apparatus of the type wherein selected portions of a stream of feed material are removed to provide a concentrate and a tails fraction.
Methods and apparatuses of this type are described in our co-pending Canadian Patent Applications Nos. 312,300 and 313,446 filed September 28, 1978 and October 13, 1978 respactively. Both of these applications disclose a method ! whereby a stream of particulate material is supported on a suitable belt and more particularly on a mesh belt. Select-ed portions are removed by a venturi-operated suction apparatus which is triggered by a suitable detection means, for example, X-ray detection in the case of diamond concentration.
An object of this invention is to provide an improvement to the above methods and apparatuses.
According to one aspect of the invention a concen-trating method comprises feeding a thin stream of particu-late materi.al past at least one particle detection device and suction nozzle and removing selected portions of the ~ b stream by rapidly applying sucti~n to the suction
2~
nozzle, wherein the stream of particula-~e material is supported from below in the region of the nozzle by a multiplicity of primary projections spaced across and along a flexible belt.
Preferably the belt is of suitable reinforced flexible plastics or rubber material and the material is a laminate comprising a fibre reinforcing layer sandwiched between a thin polyester backing layer and a thick elastomeric layer in which the supporting pro-jections are formed.
In the preferred embodiment, each primary pro-jection has at least two secondary projections projecting from the top thereof.
According to another aspect of the invention, a concentrating apparatus comprises an endless flexible belt adapted to support a thin stream of particulate matter the belt including a multiplicity of closely spaced primary projections projecting from the support sur-face thereof and at least one particle detection device and suction nozzle for removing selected portions of the stream from the belt.
In an embodiment of the invention, described by way of example only, a method of concentrating diamondiferous particulate material comprises feeding a closely-sized fraction of the wet material onto an endless belt so that it forms a mono-layer thereon. Part 1 of the belt is illustrated in the accompanying figure which is an isometric section thereof.
Z9~S
The particles 2 of material are supported by a multiplicity of primary projections 3 which project upwardly from the surface of the belt and each of which includes at least two small secondary pro-jections 4 projecting from the top thereof. Belting of this type is readily commercially available and consists of a laminated material comprising a fibre reinforcing layer 5 sandwiched between a thin polyester backing layer 6 and al comparatively thick elastomer support layer 7. The belt is thus both flexible and strong.
As the primary projections are evenly spaced and as the material is closely sized, the particles do not clog the interstices between the primar~ projections. Thus they are supported in such a manner that they are rapidly drained and a ~ood air supply and flow is available from below them. I
The belt moves the particles at a speed of about 2,25 metres per second past at least one and preferably two X-ray diamond detection devices and suction nozzles for removing selected portions of the stream from the belt.
These detection device~ and suction nozzles are fully des-~ribed in the aforementioned Canadian Patent Applications Nos. 312,300 and 313,446.
Preliminary tests conducted to date indicate that the suction devices operate particularly well when removing particles from a belt of the type described and that shorter suction periods are achievable.
,~' E~ ~ , ~ 4 ~L~L'~ 9 2 S
This type of belt has the Further advantages over a steel mesh belt in that it is less expensive, more durable and has a better longi~
tudinal strength.
Other embodiments are envisaged within the scope of the invention particularly with respect to the configuration of both the primary and secondary projections and the materials and construction of the belt. It should furthermore be noted that the invention may be appli~d to the sorting of other materials where different types of de~ection apparatus are used.
nozzle, wherein the stream of particula-~e material is supported from below in the region of the nozzle by a multiplicity of primary projections spaced across and along a flexible belt.
Preferably the belt is of suitable reinforced flexible plastics or rubber material and the material is a laminate comprising a fibre reinforcing layer sandwiched between a thin polyester backing layer and a thick elastomeric layer in which the supporting pro-jections are formed.
In the preferred embodiment, each primary pro-jection has at least two secondary projections projecting from the top thereof.
According to another aspect of the invention, a concentrating apparatus comprises an endless flexible belt adapted to support a thin stream of particulate matter the belt including a multiplicity of closely spaced primary projections projecting from the support sur-face thereof and at least one particle detection device and suction nozzle for removing selected portions of the stream from the belt.
In an embodiment of the invention, described by way of example only, a method of concentrating diamondiferous particulate material comprises feeding a closely-sized fraction of the wet material onto an endless belt so that it forms a mono-layer thereon. Part 1 of the belt is illustrated in the accompanying figure which is an isometric section thereof.
Z9~S
The particles 2 of material are supported by a multiplicity of primary projections 3 which project upwardly from the surface of the belt and each of which includes at least two small secondary pro-jections 4 projecting from the top thereof. Belting of this type is readily commercially available and consists of a laminated material comprising a fibre reinforcing layer 5 sandwiched between a thin polyester backing layer 6 and al comparatively thick elastomer support layer 7. The belt is thus both flexible and strong.
As the primary projections are evenly spaced and as the material is closely sized, the particles do not clog the interstices between the primar~ projections. Thus they are supported in such a manner that they are rapidly drained and a ~ood air supply and flow is available from below them. I
The belt moves the particles at a speed of about 2,25 metres per second past at least one and preferably two X-ray diamond detection devices and suction nozzles for removing selected portions of the stream from the belt.
These detection device~ and suction nozzles are fully des-~ribed in the aforementioned Canadian Patent Applications Nos. 312,300 and 313,446.
Preliminary tests conducted to date indicate that the suction devices operate particularly well when removing particles from a belt of the type described and that shorter suction periods are achievable.
,~' E~ ~ , ~ 4 ~L~L'~ 9 2 S
This type of belt has the Further advantages over a steel mesh belt in that it is less expensive, more durable and has a better longi~
tudinal strength.
Other embodiments are envisaged within the scope of the invention particularly with respect to the configuration of both the primary and secondary projections and the materials and construction of the belt. It should furthermore be noted that the invention may be appli~d to the sorting of other materials where different types of de~ection apparatus are used.
Claims (7)
OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A concentrating method comprising feeding a thin stream of particulate material past at least one particle detection device and suction nozzle and removing selected portions of the stream by rapidly applying suction to the suction nozzle, wherein the stream of particulate material is supported from below in the region of the nozzle by a multiplicity of primary projections spaced across and along a flexible belt.
2. A method as claimed in claim 1 in which the thin stream is essentially a mono-layer of particulate material.
3. A method as claimed in claim 1 in which there are at least two particle detection devices and suction nozzles in series.
4. A method as claimed in claim 1 in which at least some of the particles are supported by secondary projections projecting from the first projection.
5. Concentrating apparatus comprising an endless flexible belt adapted to support a thin stream of particulate matter the belt including a multiplicity of closely spaced primary projections pro-jecting from the support surface thereof and at least one particle detection device and suction nozzle for removing selected portions of the stream from the belt.
6. Apparatus as claimed in claim 5 in which the belt includes at least two secondary projections projecting from each primary projection in a direction away from the belt.
7. Apparatus as claimed in claim 5 in which there are at least two detection devices and suction nozzles in series.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ZA00777044A ZA777044B (en) | 1977-11-28 | 1977-11-28 | An improved concentrating method and apparatus |
| ZA77/7044 | 1977-11-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1122925A true CA1122925A (en) | 1982-05-04 |
Family
ID=25572315
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA315,873A Expired CA1122925A (en) | 1977-11-28 | 1978-11-06 | Multi-projection belt conveyor in a suction sorting system |
Country Status (3)
| Country | Link |
|---|---|
| AU (1) | AU506519B2 (en) |
| CA (1) | CA1122925A (en) |
| ZA (1) | ZA777044B (en) |
-
1977
- 1977-11-28 ZA ZA00777044A patent/ZA777044B/en unknown
-
1978
- 1978-11-06 CA CA315,873A patent/CA1122925A/en not_active Expired
- 1978-11-15 AU AU41608/78A patent/AU506519B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| ZA777044B (en) | 1978-12-27 |
| AU506519B2 (en) | 1980-01-10 |
| AU4160878A (en) | 1979-06-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |