Patent Application
20200246807
This invention relates to the output end pulley or output end roll component of a continuous loop belt magnetic materials separating conveyor. More particularly, this invention relates to the character and arrangement of permanent magnets which are incorporated into such rolls.
Conventional and commonly known magnetic separating conveyors include a continuous loop conveyor belt which rollably cycles about an upstream or input end pulley or roll, and which rollably cycles about a downstream output end pulley or roll. Permanent magnets are known to be mounted within and as a part of the output rolls of such separating conveyors in order to extract ferrous materials from a body of source materials which is conveyed along the upper flight of the conveyor's continuous loop belt.
Non-ferrous materials conveyed by such magnetic separating conveyors typically fall along a conveyor exiting trajectory which is directed downwardly and slightly forwardly from the output end of the conveyor. In contrast, ferrous materials which are attracted by the output rolls' magnets during such materials' arcuate path about the output roll fall along exit trajectories which are skewed rearwardly with respect to the downward and slightly forward exit trajectories of the non-ferrous materials.
Where a collection bin is positioned beneath the output end of such magnetic separating conveyor at a position which coincides with such rearwardly skewed exit trajectories, the magnetic separating conveyor may advantageously collect an extract of the source materials which substantially exclusively consists of ferrous materials. However, where the source materials carried by such conventional magnetic separating conveyors include a mixture of ferrous materials, electrically conductive non-ferrous materials, and non-conductive non-ferrous materials, such conveyors are often incapable of collecting such substantially exclusive ferrous materials extract.
Such deficit in conventional separators' ability to collect an exclusive ferrous materials extract may be attributed to the orientations of those separators' magnetic fields. During rotating operation, the output roll of a conventional magnetic separating conveyor commonly produces orbiting magnetic fields whose looped lines of magnetic flux lie within planes which cross or intersect the roll's rotation axis. As electrically conductive and non-ferrous materials begin to travel within their conveyor exiting trajectories, the orbiting magnetic fields such materials' paths. As the conventional roll's magnetic fields orbitally intersect the exit trajectories of the non-ferrous and electrically conductive materials, Lenz effect inductions of electric micro-currents occur within such materials. Just as such roll's orbiting magnetic flux loops lie within planes which intersect the roll's rotation axis, portions of the work exerted by the flux upon such materials via Lenz effects is directed rearwardly. Such Lenz effect generated forces tend to undesirably skew such materials' exit trajectories rearwardly.
Such Lenz effect skewing of the exit trajectories of electrically conductive non-ferrous materials are known to divert such materials into a collection bin which is intended to exclusively collect a ferrous metal extract of the source materials, undesirably tainting the purity of such extract.
The instant inventive magnetic separating conveyor output roll solves or ameliorates the problems, defects, and deficiencies of conventional magnetic separating conveyor rolls by specially configuring the magnets of the roll to substantially exclusively generate orbiting magnetic fields whose looping lines of magnetic flux lie within planes which include rather than intersect the roll's rotation axis.
A first structural component of the instant inventive magnetic separating conveyor output roll comprises a first plurality of magnetic rings. In the preferred embodiment, each ring among the first plurality of magnetic rings has a rectangular or square radial cross sectional shape. Circular rotations of such rectangular cross sections about the rotation axis of the roll geometrically define outer and inner ends or surfaces which extend completely annularly or circumferentially. In the preferred embodiment, each ring among the first plurality of magnetic rings presents annularly extending north and south poles which are respectively positioned at said each ring's annular outer and inner ends.
A further structural component of the instant inventive magnetic separating conveyor output roll comprises a second plurality of magnetic rings which are configured similarly with the first plurality of magnetic rings, with the exception that the annular north and south poles of each second magnetic ring is respectively positioned at said each ring's inner and outer ends. The first and second pluralities of magnetic rings are stacked in a series along the axis of rotation of the roll, such series preferably arranging the first and second magnetic rings in an alternating fashion wherein each first magnetic ring is axially adjacent either a pair of the second magnetic rings or one of such rings, and wherein each second magnetic ring is axially adjacent either a pair of the first magnetic rings or one of such rings.
During rotating operation of the instant inventive magnetic separating conveyor output roll, each of the roll's orbiting lines of magnetic flux extends and loops between north and south poles within a plane which includes the roll's rotation axis. Similarly with the function of conventional magnetic separating conveyors, such orbiting magnetic flux loops intersect the exit trajectories of items of non-ferrous electrically conductive material which fall from the output end of the conveyor. However, unlike the conventional separating conveyors, the flux lines generated by instant inventive roll advantageously skew the exit trajectories of the non-ferrous electrically conductive materials only in the axial or lateral direction.
The instant inventive roll assures that Lenz effects which are experienced by the non-ferrous electrically conductive material during travel along their exit trajectories tend to skew those trajectories only laterally with respect to the longitudinally moving conveyor, or axially with respect to the roll's rotation axis.
The axial plane oriented magnetic flux which is generated by the instant inventive roll advantageously prevents rearward skewing of the exit trajectories of electrically non-conductive non-ferrous components of the source material. Accordingly, the instant inventive roll prevents such electrically conductive non-ferrous materials from becoming intermingled with a desirably pure stainless steel extract of the source materials.
Accordingly, objects of the instant invention include the provision of a magnetic separating conveyor output roll which incorporates structures as described above, and which arranges those structures in manners described above for the achievement and performance of beneficial functions described above.
Other and further objects, benefits, and advantages of the instant invention will become known to those skilled in the art upon review of the Detailed Description which follows, and upon review of the appended drawings.
Referring now to the drawings, and in particular to Drawing
A further structural component of the instant inventive magnetic separating conveyor output roll 1 comprises a second plurality of magnetic rings which are referred to generally by Reference Arrows 4. In the exemplary roll 1 of Drawing
As indicated in
In use of the instant inventive roll 1, referring to
The exclusive axial alignments of the polar axes of the roll 1 assure that each north to south looping line of magnetic flux 40 resides within a plane 41 which also includes the roll's rotation axis 30. As a result of such axial plane orientations of the magnetic flux 40, Lenz effect generated force vectors applicable to electrically conductive items (e.g., screws 46, 48) moving within and relative to such flux 40 point substantially exclusively within such axial planes 41. Accordingly, in operation of the instant invention, Lenz effects imposed upon the non-ferrous electrically conductive screws 46, 48 exclusively skew those screws' exit trajectories in the axial direction or leftwardly and rightwardly, with little or no skewing in the rearward direction. Screws 46, 48 advantageously fall into collection bin 54 instead of into bin 52. Accordingly, the magnetic rolls' creation and facilitation of such axial plane oriented magnetic flux lines 40 prevents fouling of the stainless steel extract collected within bin 52.
Referring simultaneously to
Referring to
While axial armaturing of magnetic flux at the radially outer ends of the magnetic rings 2 and 4 is desirably avoided to prevent dissipation of the rolls' magnetic strength, magnetic armaturing at the radially inner ends of such magnetic rings is preferably established in order to enhance the roll's magnetic strength. To facilitate radially inner magnetic armaturing, a mild steel or iron sleeve or substrate 29 is preferably provided, such substrate 29 overlying the roll's cylindrical core 31 and immediately underlying the radially inner ends of the magnetic rings 2 and 4.
The magnetic rings 2 and 4 are inherently held in the alternating series of
While the principles of the invention have been made clear in the above illustrative embodiment, those skilled in the art may make modifications to the structure, arrangement, portions and components of the invention without departing from those principles. Accordingly, it is intended that the description and drawings be interpreted as illustrative and not in the limiting sense, and that the invention be given a scope commensurate with the appended claims.
