The present invention relates generally to systems for separating desired articles from a stream of articles. More particularly the present invention is directed to systems for recovering selected articles that include a substantial portion of magnetically attractable material.
Prior separation systems using magnetic properties have focused on separating magnetically attractable articles from non-magnetically attractable articles. Thus, the separator devices using magnets have constantly applied their magnetic attraction/repulsion forces to the entire stream of articles. These prior art systems are not suitable for separation of selected magnetically attractable articles from a stream of articles including non-selected magnetically attractable articles.
There is a need for improved separation systems capable of separation of selected magnetically attractable articles from a stream of articles including non-selected magnetically attractable articles.
In one embodiment a method of sorting a selected magnetically attractable article from non-selected magnetically attractable articles in a stream of articles may include steps of:
In another embodiment a sorting apparatus may be provided for sorting selected magnetically attractable articles from a stream of articles including non-selected magnetically attractable articles. A sensor generates sensor signals representative of a property associated with a selected class of magnetically attractable articles. A separator device includes an array of magnets arranged for interaction with the stream of articles. A controller receives sensor signals from the sensor, identifies a location within the stream of articles of a selected magnetically attractable article, and selectively activates one or more magnets of the array of magnets and thereby magnetically attracts the selected magnetically attractable article from a first trajectory into a second trajectory while allowing non-selected magnetically attractable articles to continue along the first trajectory.
In another embodiment a sorting apparatus may include a separator device for addition to a sorting system. The separator device may include an array of electro-magnetic pole pieces each of which can be selectively activated as either a negative or a positive pole piece, and a controller. The controller may be configured to activate a first group of adjacent pole pieces including at least one negative pole piece and at least one positive pole piece thereby creating a first magnetic field extending from the first group of adjacent pole pieces toward the first trajectory.
Numerous objects, features and advantages of the present invention will be readily apparent to those skilled in the art upon reading of the following disclosure when taken in conjunction with the accompanying drawings.
As seen in
The conveyor 12 shown in
The stream of articles 14 may, for example, be shredded automobiles or household appliances and may include many different types of magnetically attractable articles, and of course the stream of articles may also include non-magnetically attractable articles. One group of such articles that may be selected for separation is cores of electric generators or electric motors which include substantial amounts of copper wire windings. These articles are sometimes referred to in the trade as “meatballs”. Such “meatballs” may have a weight in the range of 1 lb to 20 lb or even greater. It may be desired to separate these cores from the other metal scrap so as to recover the valuable copper windings. In one example of a separation system 10 for such articles the conveyor 12 may have a width in a range of from about 36 inches to about 48 inches, and the conveyor may operate at a speed in a range of from about 100 ft/min to about 200 ft/min. The conveyor may be narrower than 36 inches or wider than 48 inches, and the operating speeds may be less than 100 ft/min or greater than 200 ft/min.
In another example, the stream of articles 14 may be shredded electronic waste. In this example again it may be desired to recover articles including copper, or other valuable metals, but the size of the articles to be separated will be smaller by orders of magnitude than the “meatballs” being separated from shredded automobiles and household appliances. The principles of separation described herein apply to each of these examples, and any others which involve a stream of articles including magnetically attractable articles that are desired to be separated from other articles including non-desirable magnetically attractable articles. The separator device for a specific process will have its magnets sized so as to provide the appropriate forces to separate the articles in question.
The sensor 18 may for example be configured to detect the red color of the copper windings. One example of such a color sensor 18 is the L-VIS optical sorter sold by MSS, Inc., the assignee of the present invention, which uses high-resolution camera technology to provide accurate color and shape separation.
Another sensor 18 may for example be the CIRRUS optical sorter sold by MSS, Inc., the assignee of the present invention, which uses a large number of near infrared and color wavelengths to scan the articles.
The sensor 18 may also identify small wire articles by shape as described in U.S. Pat. No. 8,809,718, assigned to the assignee of the present invention, the details of which are incorporated herein by reference.
The sensor 18 may also use induction-based metal detection for identifying different types of metal articles as described in U.S. Pat. No. 10,350,644, assigned to the assignee of the present invention, the details of which are incorporated herein by reference.
A separator 20 located adjacent the discharge end 26 of the conveyor 12 may include an array 22 of magnets arranged across a width 24 of the conveyor 12 and arranged for interaction with the articles passing off the discharge end 26 of the conveyor.
A controller 28 is configured to receive the sensor signals 18S from the sensor 18, to identify a location within the stream of articles of a selected magnetically attractable article, and to then selectively activate one or more magnets of the array 22 of magnets and thereby magnetically attract the selected magnetically attractable article from a first trajectory 30 into a second trajectory 32 while allowing non-selected magnetically attractable articles and non-magnetically attractable articles to continue along the first trajectory 30. Further details of the controller 28 are described below with regard to
At a downstream location within a separator housing 34 a divider 36 physically divides the first and second trajectories 30 and 32. The non-selected articles following the first trajectory 30 may be collected in a first container or collection conveyor 38. The selected articles following the second trajectory 32 may be collected in a second container or collection conveyor 40.
It is noted that in the embodiment of
Electro-Magnet Embodiment
In one embodiment the magnets of the array 22 (or the array 222) of magnets may be electro-magnets. The array 22 of electro-magnets may be constructed as an array of pole pieces 42a, 42b, 42c, etc., each of which can be selectively activated as either a negative or a positive pole piece.
For example, in
Another example, of a magnetic field 48″ of greater influence distance 52″ is shown in
Also in order to maximize the effectiveness of the array 22 of magnets in attracting the selected articles 14 it is desirable to have the end face 56 of the pole pieces as close as possible to the articles 14, preferably no greater than ¼ inch away, more preferably no greater than ⅛th inch away, and even more preferably no more than 1/16th inch away. This can be accomplished, while still protecting the pole pieces 42 from impact by the articles 14, by using the cover sheet 64 and placing the end faces 56 of the pole pieces against the underside of the cover sheet 64. Preferably the end face 56 of each pole piece across the entire end face 56 is located no more than ¼ inch, and more preferably no more than ⅛th inch, and still more preferably no more than 1/16th inch from the underside of the cover sheet 64.
Permanent Magnet Embodiment of
In a further embodiment the movable actuators 72 may be used to move electro-magnets which are switched on and off as described above for the electromagnet embodiment. This combines the magnetic attraction effect of both closer physical proximity and an activated electromagnet.
The Controller:
Details of the controller 28 are further shown schematically in
The controller 28 may also receive other signals indicative of various functions of the sorting apparatus 10. The signals transmitted from the various sensors to the controller 28 are schematically indicated in
Similarly, the controller 28 will generate command signals for controlling the operation of the various actuators, which command signals are indicated schematically in
Controller 28 includes or may be associated with a processor 100, a computer readable medium 102, a data base 104 and an input/output module or control panel 106 having a display 108. An input/output device 110, such as a keyboard or other user interface, is provided so that the human operator may input instructions to the controller. It is understood that the controller 28 described herein may be a single controller having all of the described functionality, or it may include multiple controllers wherein the described functionality is distributed among the multiple controllers.
Various operations, steps or algorithms as described in connection with the controller 28 can be embodied directly in hardware, in a computer program product 112 such as a software module executed by the processor 100, or in a combination of the two. The computer program product 112 can reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, or any other form of computer-readable medium 102 known in the art. An exemplary computer-readable medium 102 can be coupled to the processor 100 such that the processor can read information from, and write information to, the memory/storage medium. In the alternative, the medium can be integral to the processor. The processor and the medium can reside in an application specific integrated circuit (ASIC). The ASIC can reside in a user terminal. In the alternative, the processor and the medium can reside as discrete components in a user terminal.
The term “processor” as used herein may refer to at least general-purpose or specific-purpose processing devices and/or logic as may be understood by one of skill in the art, including but not limited to a microprocessor, a microcontroller, a state machine, and the like. A processor can also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
Methods of Operation
One method of sorting selected magnetically attractable articles from non-selected magnetically attractable articles in a stream 14 of articles may include:
In an embodiment such as illustrated in
It is noted that the term “trajectory” is used in the broad sense to mean a path of the articles in free fall under the control of gravity. Although the trajectories are shown as curved, a trajectory could also be directed straight down.
In one embodiment of this method in step (c) the magnets may be electro-magnets and the selectively activating may include electrically energizing the one or more electro-magnets.
As schematically shown in
As schematically shown in
In another embodiment, as schematically illustrated in
The method may further include shielding the magnets with a non-magnetic cover sheet 64 covering the array 22 of magnets to prevent impact of the articles 14 with the magnets.
Thus, it is seen that the apparatus and methods of the present invention readily achieve the ends and advantages mentioned as well as those inherent therein. While certain preferred embodiments of the present invention have been illustrated and described for purposes of the present disclosure, numerous changes in the arrangement and construction of parts and steps may be made by those skilled in the art which changes are encompassed within the scope and spirit of the present invention as defined by the appended claims
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