U.S. patent number 3,712,472 [Application Number 05/098,498] was granted by the patent office on 1973-01-23 for apparatus for handling magnetically attractive material.
Invention is credited to Eldon G. Elliott.
United States Patent |
3,712,472 |
Elliott |
January 23, 1973 |
APPARATUS FOR HANDLING MAGNETICALLY ATTRACTIVE MATERIAL
Abstract
Apparatus for handling material by magnetic attraction
comprising an elongated tubular member of nonmagnetic material with
a magnet slidably received in the tubular member. The magnet is
movable along the length of the tubular member between starting and
dwell positions to carry magnetically attractive articles or
material along the tubular member. A nonmagnetic barrier engages
the tubular member between the starting and dwell positions to
prevent the articles or material attracted by the magnets from
moving past the position of the barrier as the magnet moves past
the barrier to the dwell position.
Inventors: |
Elliott; Eldon G. (Livonia,
MI) |
Family
ID: |
22269554 |
Appl.
No.: |
05/098,498 |
Filed: |
December 16, 1970 |
Current U.S.
Class: |
210/222; 271/193;
198/619 |
Current CPC
Class: |
B01D
35/06 (20130101); B03C 1/288 (20130101); B03C
1/12 (20130101); B03C 2201/18 (20130101) |
Current International
Class: |
B03C
1/00 (20060101); B01D 35/06 (20060101); B03C
1/28 (20060101); B03C 1/02 (20060101); B01d
035/06 () |
Field of
Search: |
;210/222,223
;209/217,225,229 ;198/41 ;271/63A |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Friedman; Reuben
Assistant Examiner: Granger; T. A.
Claims
I claim:
1. Apparatus for handling material by magnetic attraction
comprising: an elongated tubular member of non-magnetic material; a
magnet slidably received in said tubular member for movement along
the length thereof between a starting position and a dwell
position, said magnet being operable to attract articles of
magnetically responsive material externally of said tubular member;
means for selectively moving said magnet in said tubular member in
opposite directions between said starting and dwell positions; a
barrier engaging said tubular member between said starting and
dwell positions for preventing articles and material attracted by
said magnet from moving past the position of said barrier as the
magnet moves to the dwell position; said magnet being in the form
of a piston in generally fluid-tight relationship with the inner
surface of said tubular member; and said means comprising a fluid
system connected with said tubular member and selectively operable
to cause fluid flow in opposite directions through said tubular
member.
2. Apparatus as claimed in claim 1 wherein said fluid system
includes a reservoir, a pump for delivering fluid from said
reservoir, and a valve for controlling the direction of flow of
fluid from said pump through said tubular member.
3. Apparatus for handling material by magnetic attraction
comprising: a plurality of spaced, parallel tubes of nonmagnetic
material; a magnet supported in each of said tubes for reciprocable
movement along the length thereof; means for moving said magnets
simultaneously in a selected direction through the respective
tubes; and a transverse manifold at each end of said tubes securing
said tubes together in spaced, parallel relationship, said magnets
defining pistons in said tubes and said means comprising a fluid
flow system connected with said manifolds selectively operable to
cause fluid flow in opposite directions in said tubes to cause
corresponding movement of said magnets.
4. Apparatus as claimed in claim 3 including a barrier between said
manifolds for stopping movement of articles or material attracted
by said magnets as the magnets move between said manifolds.
5. Apparatus as claimed in claim 4 wherein said barrier comprises a
sheet member having a plurality of apertures each closely receiving
one of said tubes to thereby block passage of any material
attracted by said magnets as said magnets pass said barrier.
6. Apparatus as claimed in claim 5 further including a collection
chute of nonmagnetic material having its inlet end disposed
adjacent said tubes and barrier to receive material released from
the magnetic field of said magnets as the magnets move past said
barrier.
7. Apparatus as claimed in claim 5 further including a roller of
magnetic material mounted between each adjacent pair of tubes near
said barrier for collecting material released from the magnetic
field of the magnets in said tube as said magnets move past said
barrier, and means for removing material from the surface of said
rollers and conducting such material away from said tubes.
8. Apparatus as claimed in claim 7 wherein said last named means
comprises a collection chute of nonmagnetic material having a
plurality of slots each closely receiving one of said rollers to
wipe material from the surface thereof.
9. Apparatus for separating magnetically attractive particles from
nonmagnetic material comprising: a container for a mixture of
magnetically attractive material and nonmagnetic material; a pair
of spaced parallel manifolds of nonmagnetic material; a plurality
of spaced, parallel tubes of nonmagnetic material extending between
said manifolds, each end of each tube being in fluid communication
with one of said manifolds; a magnetic piston in each of said
tubes; a fluid flow system connected with said manifolds
selectively operable to cause fluid flow in opposite directions
through said tubes to cause movement of said magnetic pistons in
the same direction in said tubes; one of said manifolds being
located in said container and the other of said manifolds being
located outside said container; and a nonmagnetic barrier mounted
on said tubes outside said container, said barrier being engageable
by magnetically attractive material carried from said container by
the magnetic attraction of said pistons as said pistons move from
said one manifold toward said other manifold to release such
material from the magnetic field of said pistons as the pistons
move past said barrier toward said other manifold.
10. Apparatus as claimed in claim 9 further including a container
for magnetically attractive material located to receive material
falling from said barrier.
11. Apparatus as claimed in claim 9 further including a shaft
mounted on said tubes and extending transversely with respect to
said tubes; a plurality of rollers of magnetic material mounted on
said shaft and spaced from each other such that each of said tubes
is received between an adjacent pair of rollers, said shaft and
rollers being located outside said container on the side of said
barrier opposite said other manifold to receive material falling
from said barrier; and means for removing material from said
rollers and conducting such material away from said rollers.
12. Apparatus as claimed in claim 11 wherein said last named means
comprises a chute having a slot for receiving each of said rollers
with the edges of the slots being disposed in close, wiping
relationship with the respective rollers to wipe material from the
surface thereof upon rotation of the roller.
13. Apparatus for handling material by magnetic attraction
comprising: an elongated tubular member of nonmagnetic material; a
magnet slidably received in said tubular member for movement along
the length thereof between a starting position and a dwell
position, said magnet being operable to attract articles of
magnetically responsive material externally of said tubular member;
means for selectively moving said magnet in said tubular member in
opposite directions between said starting and dwell positions; a
barrier engaging said tubular member between said starting and
dwell positions for preventing articles and material attracted by
said magnet from moving past the position of said barrier as the
magnet moves to the dwell position; said magnet being in the form
of a piston in generally fluid tight relationship with the inner
surface of said tubular member; said means comprising a fluid
system connected with said tubular member and selectively operable
to cause fluid flow in opposite directions through said tubular
member; a powered roller of magnetic material mounted on said
tubular member on the opposite side of said barrier member from
said dwell position; and a collection tray of nonmagnetic material
having a slot therein for receiving said roller and wiping
magnetically attractive particles from the surfaces of said
roller.
14. Apparatus for handling material by magnetic attraction
comprising: an elongated tubular member of nonmagnetic material; a
magnet slidably received in said tubular member for movement along
the length thereof between a starting position and a dwell
position, said magnet being operable to attract articles of
magnetically responsive material externally of said tubular member;
means for selectively moving said magnet in said tubular member in
opposite directions between said starting and dwell positions; a
barrier engaging said tubular member between said starting and
dwell positions for preventing articles and material attracted by
said magnet from moving past the position of said barrier as the
magnet moves to the dwell position; said magnet being in the form
of a piston in generally fluid tight relationship with the inner
surface of said tubular member; said means comprising a fluid
system connected with said tubular member and selectively operable
to cause fluid flow in opposite directions through said tubular
member; and a magnetically attractive carrier supported externally
on said tubular member for movement therealong in response to
movement of said magnet.
15. Apparatus as claimed in claim 14 wherein said carrier comprises
a sleeve member concentrically receiving said tubular member, and a
plurality of balls supporting said sleeve on said tubular
member.
16. Apparatus as claimed in claim 15 wherein said sleeve member and
balls are of nonmagnetic material, and including magnetically
attractive members mounted on each end of said sleeve member.
17. Apparatus as claimed in claim 14 wherein said carrier includes
a bed portion supported for movement along said tubular member, and
a magnet carried by said bed portion for causing movement of said
bed portion in response to movement of the magnet in said tubular
member.
18. Apparatus as claimed in claim 17 wherein said bed portion is
pivotal about an axis parallel to said tubular member.
19. Apparatus as claimed in claim 18 further including means for
pivoting said bed portion to a dump position when the magnet in
said tubular member has passed said barrier.
20. Apparatus for handling material by magnetic attraction
comprising: a plurality of spaced, parallel tubes of nonmagnetic
material; a magnet supported in each of said tubes for reciprocable
movement along the length thereof; means for moving said magnets
simultaneously in a selected direction through the respective
tubes; a transverse manifold at each end of said tubes securing
said tubes together in spaced, parallel relationship, said magnets
defining pistons in said tubes and said means comprising a fluid
flow system connected with said manifolds selectively operable to
cause fluid flow in opposite directions in said tubes to cause
corresponding movement of said magnets; and a plurality of rollers
each mounted between an adjacent pair of said tubes, said rollers
being spaced from each other along the length of said tubes and
each being rotatable about an axis transverse to said tubes with
its periphery projecting beyond said tubes for engaging sheet
material attracted by said magnets.
21. Apparatus as claimed in claim 20 wherein at least one of said
rollers is of magnetic material to inhibit transverse sliding of
sheet material engaging said rollers.
22. Apparatus as claimed in claim 20 including a barrier member
engageable by sheet material attracted to said tubes by said
magnets to release such sheet material from the attraction of said
magnets as said magnets pass said barrier during travel of said
magnets through said tubes.
23. Apparatus for handling material by magnetic attraction
comprising: a plurality of spaced, parallel tubes of nonmagnetic
material; a magnet supported in each of said tubes for reciprocable
movement along the length thereof; means for moving said magnets
simultaneously in a selected direction through the respective
tubes; a transverse manifold at each end of said tubes securing
said tubes together in spaced, parallel relationship, said magnets
defining pistons in said tubes and said means comprising a fluid
flow system connected with said manifolds selectively operable to
cause fluid flow in opposite directions in said tubes to cause
corresponding movement of said magnets; and magnetically attractive
carrier means supported externally on said tubes for movement along
the length thereof in response to movement of said magnets.
24. Apparatus as claimed in claim 23 wherein said carrier means
comprises a carriage supported on said plurality of tubes for
movement along the length thereof, and a plurality of magnetically
attractive elements carried by said carriage to cause movement
thereof in response to movement of said magnets within said
tubes.
25. Apparatus as claimed in claim 24 wherein said magnetically
attractive elements each comprises an external magnet projecting
from said carriage between adjacent pairs of said tubes.
26. Apparatus as claimed in claim 25 including a retainer
projecting from said carriage and receiving one of the outer tubes
of said plurality of tubes to prevent displacement of said carriage
from said one tube but permit said carriage to pivot about said one
tube.
27. Apparatus as claimed in claim 26 including a plurality of
spaced, parallel shafts mounted on said carriage and extending
transversely of said tubes, and a plurality of rollers rotatably
mounted on each of said shafts, each of said rollers engaging one
of said tubes to movably support said carriage on said tubes.
28. Apparatus as claimed in claim 27 wherein the polarity of said
external magnets is reversed with respect to the polarity of the
magnets in said tubes.
29. Apparatus as claimed in claim 23 wherein said carrier means
comprises a plurality of sleeve members, each of which is
concentrically mounted on one of said tubes, and anti-friction
means carried by each of said sleeve members supporting the sleeve
member on the respective tubes.
30. Apparatus as claimed in claim 29 wherein said anti-friction
means comprises a plurality of ball members carried by each sleeve
member.
31. Apparatus as claimed in claim 30 including magnetically
attractive material mounted on each end of said sleeve members.
Description
This invention relates generally to material handling apparatus and
is particularly concerned with apparatus for handling material by
magnetic attraction.
There are many industrial processes wherein it is necessary to
separate ferrous, or magnetically attractive material, from
nonmagnetic material. Frequently, it is necessary to separate metal
particles, chips and filings from a liquid slurry for the purpose
of cleaning the liquid and also for recovering the metal particles.
Existing apparatus for performing this function is expensive to
operate, and requires high maintenance cost.
There are also many operations in industry requiring the frequent
movement of material from one fixed location to another for further
processing, storage, packaging or shipment. For example, in the
handling of sheet material, it is frequently necessary to move the
sheet material from one location to another location where it is
stacked for storage or shipment. In some factories and
manufacturing plants, it is necessary to move parts, scrap and
other material over the same route between two locations.
An object of this invention is to provide apparatus for handling
material by magnetic attraction wherein magnets are slidably
received in nonmagnetic tubes so that movement of the magnets
through the tubes can cause magnetically attractive material or
carts or carriages to move along the length of the tubes.
Another object is to provide the apparatus for handling material by
magnetic attraction wherein all of the moving parts can be
completely enclosed and protected from liquid, dust, and other
deleterious substances.
Another object is to provide apparatus for handling material by
magnetic attraction wherein a magnetic member is caused to move
along a fixed path, the magnetic field of the magnetic member
serving as the propelling force for moving the material to be
handled, the magnet being enclosed by nonmagnetic material so that
movement of the magnetic member beyond a barrier engaged by
material attracted to the magnet will release the material from the
field of the magnetic member.
In carrying out the foregoing, and other objects of the invention,
apparatus according to the present invention includes an elongated
tubular member of nonmagnetic material with a magnet slidably
received in the tubular member for movement along the length
thereof between a starting position near one end of the tubular
member, and a dwell position near the other end thereof. The magnet
is operable to attract articles of magnetically responsive material
externally of the tubular member when the magnet is caused to move
between the starting and dwell positions. A barrier engages the
tubular member between the starting and dwell positions for
preventing articles and material moved along the tubular member by
the magnet from moving past the position of the barrier as the
magnet moves past the barrier to the dwell position.
In one arrangement, the magnet is in the form of a piston, having a
generally fluid-tight relationship with the inner surface of the
tubular member, and is caused to move through the tubular member by
a fluid flow system. The fluid flow system is connected with the
tubular member and is selectively operable to cause fluid flow in
opposite directions through the tubular member, the fluid flow
forcing the magnetic piston to move in the direction of flow
through the tubular member. The fluid system includes a reservoir,
a pump for delivering fluid from the reservoir and a valve for
controlling the direction of flow of fluid from the pump through
the tubular member.
In one embodiment of the invention, the magnet is caused to move
through the tube by mechanical apparatus, including a pair of
shafts extending transversely to the tube with a flexible connector
having one end connected with one of the shafts and its other end
connected with a magnet, and a second flexible connector having one
of its ends connected with the other shaft and its other end
connected with the magnet. Simultaneous rotation of the shafts in
one direction causes one of the flexible connectors to wind around
its shaft and the other flexible connector to simultaneously unwind
from its shaft, and the magnet is carried through the tubes by the
winding and unwinding of the respective connectors. One of the
shafts is powered by a motor to rotate in one direction, and the
other shaft is spring loaded to resist rotation in the direction of
the powered rotation of the shafts. Consequently, when the motor
causes the shaft to rotate in one direction to move the magnet from
the starting position to the dwell position, and is then turned
off, the spring causes the magnet to return from the dwell position
to the starting position.
One specific embodiment of the invention includes a container for a
mixture of magnetically attractive material and nonmagnetic
material; a pair of spaced parallel manifolds of nonmagnetic
material with a plurality of spaced, parallel tubes of nonmagnetic
material extending between the manifolds, each end of each tube
being in fluid communication with one of the manifolds. A magnetic
piston is received in each of the tubes and a fluid flow system is
connected with the manifold including a valve which is selectively
operable to cause fluid flow in opposite directions through the
tubes to cause movement of the magnetic pistons in the same
direction. One of the manifolds is supported in the container and
the other manifold is located outside the container. A nonmagnetic
barrier is mounted on the tubes outside the container for engaging
magnetically attractive material carried from the container by the
magnetic attraction of the pistons as the pistons move from the
manifold within the container toward the manifold that is located
outside the container. As the pistons move past the barrier, the
material carried from the container is released from the magnetic
field.
When the tubes are located in substantially vertical position with
respect to the container of magnetic and nonmagnetic material, one
embodiment of the invention includes a shaft mounted on the tubes
and extending transversely with respect to the tubes, and a
plurality of rollers of magnetic material mounted on the shaft and
spaced from each other such that each of the rollers is received
between an adjacent pair of tubes of the shaft, the rollers being
located outside the container near the barrier so as to collect by
magnetic attraction material falling from the barrier. A chute
having a slot for receiving each of the rollers with the edge of
the slots being disposed in close, wiping contact with the rollers,
wipes the material collected onto the magnetic rollers from the
surfaces of the rollers as the rollers rotate through the slots,
and the material wiped from the rollers is conducted by the chute
to a container or remote location.
In another embodiment of the invention, the apparatus includes a
plurality of spaced parallel tubes of nonmagnetic material with a
magnet slidably received in each of the tubes. A plurality of
rollers, each of which is mounted between an adjacent pair of the
tubes, is rotatable about an axis transverse to the tubes. The
rollers are spaced from each other along the length of the tubes
with the periphery of each roller projecting beyond the outer
periphery of the tubes for supporting sheet material attracted by
the magnets. As the magnets move through the tubes, the sheet
material moves along the rollers until striking a nonmagnetic
barrier. As the magnets move past the barrier, the sheet material
is released from the magnetic field and drops from the tubes, the
sheets being successively stacked beneath the tubes.
In another embodiment of the invention particularly suitable for
handling sheet material, a plurality of tubes of nonmagnetic
material is disposed in substantially horizontal relationship above
a floor with a magnet slidably received in each of the tubes. A
magnetically attractive sleeve member is concentrically mounted on
each of the tubes with antifriction means in the form of balls
carried by the sleeve, the balls supporting the sleeves for
substantially frictionless movement along the tube in response to
movement of the respective magnets in the tubes. Sheet material
attracted by the magnetic field of the magnets engages the sleeve
members and is carried by movement of the sleeve members along the
lengths of the tube due to the magnetic attraction between the
magnets and the sleeve members until the magnets move past the
barrier to release the sheet from the magnetic field and permit
them to drop from the tubes and sleeve members. When the magnets
are returned to the other end of the tubes, the sleeves are carried
to the starting position due to the magnetic attraction.
Another specific arrangement for moving material from one location
to another includes tubes of nonmagnetic material with a magnet
slidably received in each of the tubes and a material transporting
carriage movably mounted on the tubes. The carriage has magnetic
attractive elements for causing movement of the carriage in
response to movement of the magnets in the tubes. As the magnets
are forced to move through the tubes, the carriage is carried by
the magnetic attraction along the length of the tube.
Other objects, advantages and features of the invention will become
apparent from the following description taken in connection with
the accompanying drawings in which:
FIG. 1 illustrates an arrangement for separating magnetically
attractive particles from nonmagnetic material by apparatus
embodying the invention;
FIG. 2 is a perspective view of the separating apparatus used in
FIG. 1;
FIG. 3 illustrates another arrangement for separating magnetically
attractive particles from nonmagnetic material;
FIG. 4 is a view taken along lines 4--4 of FIG. 3;
FIG. 5 is an elevational view of apparatus according to the
invention as utilized in handling sheet material;
FIG. 6 is a view taken along lines 6--6 of FIG. 5;
FIG. 7 is an enlarged detailed view of a modified version of the
arrangement of FIGS. 5 and 6;
FIG. 8 is a sectional view taken along lines 8--8 of FIG. 7;
FIG. 9 is an elevational view, partially in section, of another
embodiment of the invention;
FIG. 10 is a view taken along lines 10--10 of FIG. 9;
FIG. 11 is a sectional perspective view of an alternative
arrangement;
FIG. 12 is a view, partially in section, of an alternative
construction embodying the invention; and
FIG. 13 is a sectional view taken on lines 13--13 of FIG. 12.
In FIG. 1, the invention is utilized to separate ferrous or
magnetically attractive particles from a liquid. Reference numeral
2 designates a container for a mixture of magnetically attractive
material and non-magnetic material, the nonmagnetic material being
a liquid in the illustrated system. Container 2 has a bottom wall
4, an inclined end wall 6, a vertical end wall 8, and a cover 10. A
wire 12 projects upwardly from the bottom wall 4 of the container
2. The liquid containing the metallic particles is fed into the
container 2 by a conduit 14, and the cleaned liquid is removed
through a conduit 16 from the opposite side of the weir 12 from the
conduit 14.
The magnetically attractive particles are removed from the liquid
by apparatus designated generally by reference numeral 18 supported
at its lower end of the container 2. The apparatus 18 includes a
plurality of spaced, parallel tubes 20 of nonmagnetic material; a
magnet 22 supported in each of the tubes 20 for reciprocable
movement along the length thereof; and means designated generally
by reference numeral 24 for moving the magnets 22 simultaneously in
a selected direction through the respective tubes 20. Apparatus 18
includes a transverse manifold at each end of the group tubes 20
which secures the tubes together in spaced parallel relationship.
The manifold at the lower end is designated by reference numeral
26, and the manifold at the upper end is designated by reference
numeral 28. Manifold 26 is shown in FIG. 1 as being supported on
the support bracket 19.
The magnets 22 define pistons in the tubes 20, and the means 24 for
moving the magnets comprises a fluid flow system connected with the
manifolds 26 and 28 which is selectively operable to cause fluid
flow in opposite directions in the tubes 20 to cause corresponding
movement of the respective magnets 22.
Again referring to FIG. 1, when the magnets 22 are located in the
portions of the respective tubes 20 received in the container 2,
the particles of magnetically attractive material are attracted to
the outer surface of the tubes 20 by the field of the magnets 22.
As the magnets 22 are caused to move toward the manifold 28 from
the manifold 26, the particles are carried upwardly from the liquid
toward the upper end of the tubes 20. Apparatus 18 includes a
barrier 30 located between the manifold 26 and 28 for stopping or
interrupting movement of the particles or material attracted by the
magnets as the magnets move between the manifolds. The barrier 30
comprises a sheet-like member having a plurality of apertures, each
closely receiving one of the tubes 20 to block passage of any
material attracted by the magnets 22 as the magnets move past the
barrier. As the magnets 22 move past the barrier 30 as shown in
FIG. 1, any particles carried to the barrier by the magnets 22 are
released from the magnetic field so that they can fall into a
collection bin or container 32. An air or water spray device 34 may
be employed to assist in removing any particles from the surface of
the barrier 30.
The magnets 22 thus move cyclically from a starting position
adjacent the manifold 26 to a dwell position adjacent the manifold
28 by fluid flow from the fluid flow system 24. When the magnets 22
are in the starting position adjacent manifold 26, fluid is caused
to flow into the manifold 26 and force the magnets 22 to move
upwardly along the lengths of the tubes 20 to the dwell position
adjacent the upper manifold 28. The magnets remain in the dwell
position adjacent manifold 28 until the flow is reversed in the
system causing fluid to be introduced into manifold 28 forcing the
magnets 22 to return to the starting position. Each time the
magnets move from the starting position to the dwell position,
magnetically attractive material is carried by the magnets to the
barrier 30, which material falls into the collection bin 32 as the
magnet 22 moves past the barrier to release the material from the
field of the magnet. The magnets remain in the dwell position for a
time adequate to permit removal of particles from the barrier
30.
The fluid flow system 24 is schematically illustrated in FIG. 2 and
includes a reservoir 36 for hydraulic fluid, a pump 38 having its
intake connected with the reservoir for delivering fluid from the
reservoir, and a control valve 40 for controlling the direction of
flow of fluid from the pump to the tubular members 20. The control
valve 40 is illustrated in its neutral position in FIG. 2 wherein
the output line 41 of the pump is connected with a return line 43
so that fluid will return directly to the reservoir by the pump 38.
The lines 42 and 44 connected respectively with manifold 26 and 28
are blocked so that fluid cannot flow in either direction in these
lines.
When valve 40 is shifted to the right from the neutral position
shown in FIG. 2, the output line 41 is connected with line 42, and
line 44 is connected with the return line 43 so that fluid is
pumped by pump 38 into manifold 26 and is drained from manifold 28
as the magnets 22 move upwardly in the respective tubes 20.
Conversely, when the valve 40 is shifted to the left from the
position shown in FIG. 2, the output line 41 is connected with line
44 and the drain line 43 is connected with line 42 so that fluid is
pumped into manifold 28 through line 44 and is drained from
manifold 26 through the drain line 43. Relief valves 46 and 48 may
also be provided in the lines 42 and 44, respectively, to return
excess fluid to the reservoir when the pump continues to run with
the magnets located at either end of the tubes 20.
It may be desirable in some installations for the polarity of
adjacent pairs of the magnetic pistons 22 to be reversed with
respect to each other. By reversing the polarity of the adjacent
pairs of magnets 22, a mutual attraction will be maintained between
the magnets to assist in maintaining the magnets in aligned
relationship with each other in the respective tubes against the
tendency of any of the magnets to fall behind the other magnets,
particularly when a heavy load of particles is being carried by any
one particular magnet compared to the others.
The tubes 20 and barrier 30 may be of nonmagnetic stainless steel
or other material. The magnets 22 may be permanent or
electromagnets. Appropriate conductors may be provided within the
tubes 20 to connect the magnets with a source of current when
electromagnets are used instead of permanent magnets. The
conductors may, for example, extend along the inner surfaces of the
tubes, the magnets having a sliding electrical contact with the
conductors.
Thus, FIGS. 1 and 2 disclose apparatus 18 for handling material by
magnetic attraction comprising an elongated tubular member 20 of
nonmagnetic material; a magnet 22 slidably received in the tubular
member 20 for movement along the length thereof between a starting
position (at 26) and a dwell position (at 28); means 24 for
selectively moving magnet 22 in the tubular member 20 in opposite
directions between the starting and dwell positions; and a barrier
30 on the tubular member 20 between the starting and dwell
positions for preventing articles and other material attracted by
the magnet 22 from moving past the position of the barrier as the
magnet 22 moves to the dwell position.
More specifically, FIGS. 1 and 2 disclose apparatus 18 for
separating magnetically attractive particles from non-magnetic
material comprising a container 2 for a mixture of magnetically
attractive material and nonmagnetic material; a pair of spaced
parallel manifolds 26 and 28 of nonmagnetic material; a plurality
of spaced, parallel tubes 20 of nonmagnetic material extending
between said manifolds 26 and 28, each end of each tube 20 being in
fluid communication with one of the manifolds; a magnetic piston 22
in each of the tubes 20; a fluid flow system 24 connected with the
manifolds 26 and 28; the fluid flow system being selectively
operable to cause fluid flow in opposite directions through the
tubes 20 to cause movement of the magnetic pistons 22
simultaneously in the same direction in the tubes 20; means 19
supporting one of the manifolds 26 in the container 2 with the
other manifold 28 located outside the container 2; and a
nonmagnetic barrier 30 mounted on the tubes 20 outside the
container, the barrier 30 being engageable by magnetically
attractive material carried from the container by the magnetic
attraction of the pistons 22 as the pistons move from manifold 26
toward manifold 28 to release such material from the magnetic field
of the pistons as the pistons move past the barrier 30 toward the
other manifold 28.
FIGS. 3 and 4 disclose another arrangement embodying the invention
wherein ferrous metallic fines, particles, or chips are removed
from liquid received in a container or tank 102. Reference numeral
118 collectively designates apparatus which may be of identical
construction to the apparatus 18 of the embodiment of FIGS. 1 and
2. The apparatus 118 includes a pair of spaced parallel manifolds
126 and 128 of nonmagnetic material with a plurality of spaced,
parallel tubes 120 extending between the manifolds, each end of
each tube 120 being in fluid communication with the manifolds 126
and 128. A magnetic piston 122 is received in each of the tubes for
reciprocable movement along the length thereof. One of the
manifolds 126 is located in the container 102 and the other
manifold 128 is located outside the container. A nonmagnetic
barrier 130 is mounted on the tubes 120 outside of the container
and is engageable by magnetically attractive material carried from
the container by the magnetic attraction of the magnets 122 as the
magnets 122 move from a starting position at manifold 126 toward
the other manifold 128. As the magnets move past the barrier toward
manifold 128, material carried by the magnets from the container
102 is released from the magnetic field of the magnet 122.
A shaft 131 is rotatably mounted on brackets 132 carried by each of
the tubes 120, and a plurality of rollers 134 of magnetic material
is mounted on shaft 131. The magnetic rollers 134 are spaced from
each other along shaft 131 such that each of the tubes 120 is
received between an adjacent pair of rollers as shown in FIG. 4. As
the magnets 122 move past barrier 130 toward the manifold 128, the
magnetically attractive particles carried to the barrier 130 by the
magnets 122 fall from the barrier 130 and are attracted to the
surface of the rollers 134. Reference numeral 136 collectively
designates a chute for removing material from the rollers 134 and
conducting the material away from the rollers.
The chute 136 is inclined downwardly and has a slot 142 receiving
each of the rollers 134 as shown in FIG. 4. The slots 142 have each
of their edges in close, wiping relationship with the respective
rollers 134 to wipe material from the surface of the rollers upon
rotation of the rollers in a clockwise direction as shown in FIG.
3. The chute 136 is of nonmagnetic stainless steel or other
nonmagnetic material and is inclined downwardly so that the
material removed from the surfaces of the rollers 134 is carried by
gravity to a collection bin located at the end of the chute. The
weight of the material removed from the rollers 134 accumulates
until it is sufficient to overcome the magnetic attraction of the
rollers 134 which causes the material to slide down the chute
136.
FIGS. 5 and 6 illustrate apparatus 218 for handling sheet material
by magnetic attraction. The apparatus 218 may be of identical
construction to the apparatus 18 and 118 of the previously
described embodiments and includes a plurality of spaced, parallel
tubes 220 of nonmagnetic material with a magnet 222 slidably
received in each of the tubes 220. The tubes 220 extend between the
manifolds 226 and 228 of nonmagnetic material, each of the tubes
220 being in communication at their ends with the manifolds 226 and
228.
A plurality of rollers 232 is provided in FIGS. 5 and 6 for
supporting sheet material S for movement along the length of the
tubes, the movement of the sheets S resulting from the magnetic
attraction between magnets 222 and the sheet S. Each roller 232 is
mounted between an adjacent pair of the tubes 220 and is rotatable
about an axis transverse to the tubes 220. The rollers 232 are
spaced from each other along the length of the tubes, and the
periphery of each of the rollers projects beyond the outer
periphery of the tubes so that the sheet material S is held in
spaced relationship from the surface of the tubes 220.
As shown in FIGS. 5 and 6, the tubes 220 are disposed in generally
horizontal, spaced relationship with respect to a floor F, and a
barrier member 230 projects into the path of sheet S moving toward
the right in FIG. 5 to stop movement of the sheets carried along
the tube by the attraction of the magnets 222 so that sheets are
released from the magnetic field of magnets 222 as the magnets move
past the barrier 230. As shown in FIG. 5, as the sheets S strike
the barrier 230, they may be successively stacked in a container or
storage rack as the magnets 222 move beyond the barrier 230 toward
the manifold 228.
Some or all of the rollers 232 may be of magnetic material to
resist transverse movement of the sheets S with respect to the
tubes 220, the magnetic force of the rollers 232 of course being
insufficient to support the sheets S so that the sheets S fall from
the tubes 220 when they are released from the field of the magnets
222.
As in the previously described embodiments of FIGS. 1 through 4,
the magnets 222 may comprise piston members in the tubes, the
manifolds 226 and 228 being connected with a fluid flow system as
indicated by reference numeral 24 in FIG. 2.
FIGS. 7 and 8 illustrate an alternative arrangement particularly
suitable for handling sheet material wherein a magnetically
attractive carrier 236 is supported externally on each of the
tubular members 220 for movement along the length of the tubes in
response to movement of the magnets 222. The carrier member 236
comprises a sleeve member 238 concentrically receiving the tube
220. The sleeve member 238 is supported on the tube 220 by
antifriction means in the form of balls 240 mounted in apertures
formed in the wall of the sleeve member. The sleeve member and
balls may be of nonmagnetic material, and magnetically attractive
members 242 and 244 are mounted on each end of the sleeve member
238 so that the sleeve member is caused to move along the length of
the tube 220 by the magnetic attraction of the moving magnet 222
within the tube 220. Members 242 and 244 are in the form of rings
which may be of magnetically attractive material, the rings 242 and
244 being covered by resilient members 246 and 248,
respectively.
As the magnets 222 move toward the right in FIG. 7 from manifold
226 to manifold 228, sheets S are supported on the carriers 236
until the resilient member 248 strikes the barrier 230. As the
magnet 222 moves beyond the barrier 230, sheet S is released from
the magnetic field of the magnet 220 and falls from the tube 220 as
in the FIG. 5 embodiment. When the magnet 222 returns from manifold
228 to manifold 226, the carrier 236 is returned to the starting
position at manifold 226 due to the magnetic attraction between the
carrier 236 and magnet 222.
FIGS. 9 and 10 illustrate an arrangement wherein an external
carrier 236 in the form of a material transporting carriage is
supported externally on apparatus 318 which may be of identical
construction to the apparatus 18, 118, and 218 of the previously
described embodiments. Apparatus 318 includes a plurality of
spaced, parallel tubes 320 of nonmagnetic material with a magnet
322 slidably received in each of the tubes 320. The material
transporting carrier 336 is movably mounted on the tubes 320 such
that the tubes 320 serve as a track for the carriage 336.
Magnetically attractive means 348 is mounted on the carriage 336
for causing movement of the carriage along the tubes 320 in
response to movement of the magnets 322 in the tubes 320.
A pair of spaced parallel shafts 340 and 342 are mounted beneath
the bed portion 338 of the carriage, the shafts extending
transversely to the tubes 320. Rollers 344 are mounted on the
shafts 340 and 342 for supporting the carriage on the tubes 320.
The rollers 344 are each formed with a concave surface for engaging
the respective tubes 320 and providing lateral support for the
carriage 336.
Bracket members 346 depend from the carriage 336 between each
adjacent pair of tubes 320 for supporting the magnetically
attractive means which is in the form of external magnets 348. The
external magnets 348 have their polarity reversed with respect to
the magnets 322 as illustrated in FIG. 10. That is to say, the
North pole of the magnets 322 is disposed adjacent the South pole
of the magnets 348, and vice versa.
A retainer designated generally by reference numeral 350 projects
beneath the carriage 336 and receives the outermost tube 320 to
prevent displacement of the carriage with respect to the tube,
while at the same time permitting pivotal movement of the carriage
about the tube received by the retainer 350. The retainer 350
includes a pair of oppositely curved arms 352 and 354 which loosely
receive the left-hand tube 320. Consequently, the carriage can be
pivoted about the left-hand tube 20 to a dump position to dump
material supported in the carriage 336.
As the magnets 322 move away from the manifold 326, the carriage
336 is caused to move with the magnet 322 due to the mutual
attraction between magnets 322 and 348. When the carriage stops, a
hydraulic piston and cylinder member indicated by reference numeral
360 in FIG. 9 may be actuated to extend and pivot the carriage 336
about the left-hand tube 320 to a dump position. As in the
previously described embodiments, the carriage may be caused to
strike a barrier to stop movement of the carriage 336 and release
the carriage 336 from the magnetic field of the magnets 322 as the
magnets 322 move past the barrier. When the magnets 322 are caused
to return to the manifold 326 and pass the barrier on their return
trip, the carriage will be returned to its starting position at
manifold 326.
FIGS. 11 and 12 illustrate an embodiment of the invention in which
the magnets are moved mechanically through the tubes instead of
hydraulically. Reference numeral 418 collectively designates
apparatus for handling material by magnetic attraction comprising a
plurality of spaced, parallel tubes 420 of nonmagnetic material; a
magnet 422 supported in each of the tubes 420 for reciprocable
movement along the length thereof; and means for moving the magnets
422 simultaneously in a selected direction through the respective
tubes.
The apparatus further includes transverse manifolds 426 and 428 at
each end of the tubes 420, the manifolds securing the tubes 420
together in spaced, parallel relationship. The means for moving the
magnets 422 simultaneously in a selected direction through the
tubes 420 includes a pair of rotatable shafts 434 and 438 extending
transversely of the tube 420; a first set of elongated flexible
connectors 436, each of which has one end connected with shaft 434
and its other end extending through one end of the respective tubes
420 and connected with the magnet 422 therein; a second set of
elongated flexible connectors 440, each of which has one end
connected with shaft 438 and its other end extending through the
opposite end of the respective tube 420 from the corresponding
connector 436 and connected with the magnet 422 therein such that
simultaneous rotation of shafts 434 and 438 in one direction causes
the first set of flexible connectors 436 to wind around shaft 434
and the other set of flexible connectors 440 to unwind from shaft
438 to cause movement of the magnets 422 toward the right in FIG.
11. Simultaneous rotation of shafts 434 and 438 in the opposite
direction causes the first set of flexible connectors 436 to unwind
from shaft 434 and the other set of flexible connectors 440 to wind
around shaft 438 to return the magnet 422 to the position shown in
FIG. 11.
The shafts 438 and 434 are housed respectively in the manifolds 426
and 428, and shaft 434 is connected with a variable speed DC motor.
Shaft 438 is biased by springs 442 against rotation in a direction
to permit the magnets 422 to move toward the right in FIG. 11.
Motor 432 can be connected with the shaft 434 through a gear
reduction and automatic clutch device that provided for a dwell
cycle of the magnet 422 at manifold 428, after which the shaft will
be disengaged from motor 432 to permit the recoil springs 432 to
return the magnets 422 to the starting position adjacent the
manifold 426. The automatic clutch and gear reduction are
illustrated schematically at 433 in FIG. 11.
As in the preceding embodiments, as the magnets 422 move from the
starting position adjacent manifold 426 to the dwell position
adjacent manifold 428, material carried with the magnets by the
magnetic attraction thereof strikes the barrier 430 and is released
from the field of the magnets 422 as the magnets 422 move past the
barrier 430.
The magnets 422 in the embodiment of FIGS. 11 and 12 comprise a
cylindrical body 444 with antifriction means carried by the body
for supporting the body in the tube 420 in a substantially
frictionless manner. The antifriction means is in the form of
rollers 446 and 448 mounted on each end of the cylindrical body
444. The inner surface of the tubular member 420 is of circular
cross-section, and each of the rollers 446 and 448 has an outer,
semi-spherical surface engaging the inner surface of the tubes 420,
the semi-spherical surface of the rollers being substantially
concentric with the inner surface of the tube 420. The rolling axis
of roller 446 is angularly disposed about the longitudinal axis of
the tube 420 90.degree. from the rolling axis of roller 448.
FIGS. 13 and 14 illustrate the construction of a magnet 422' which
is similar to the construction of the magnets 422 shown in FIGS. 11
and 12 except that the magnet 422' is provided with seals for use
in a fluid system such as shown in FIGS. 1 and 2. The magnet 422'
is received in a tube 420 and has a cylindrical body 444 with a
roller 446 mounted at one end and a roller 448 mounted at the other
end. The roller 446 is mounted on a U-shaped bracket having a base
portion 450 and a pair of leg portions 452. The roller 446 has a
semi-spherical outer surface which is concentric with the tube 420,
as shown particularly in FIG. 14. The roller 446 rotates about a
shaft 454 which extends through a bearing assembly 456
concentrically received in the roller 446. Roller 448 similarly is
mounted on a U-shaped bracket having a base portion 460, leg
portions 462, shaft 464 and bearing assembly 466. The construction
of the roller 448 and its supporting structure is identical with
that of roller 446 except that the shaft 464 is disposed at right
angles to the shaft 454. Sealing members 472 are mounted in the
circumferential grooves at opposite ends of the cylindrical body
portion 444.
Thus, in each of the disclosed embodiments, a magnet is enclosed in
and moves through a nonmagnetic tube, and the magnet can be sealed
against outside contamination in each of the assemblies
illustrated. The magnet can be caused to move through the
nonmagnetic tube hydraulically, pneumatically, electrically or
mechanically. The magnetic field from the magnet on the inside of
the nonmagnetic tube collects and carries with it ferrous metal or
other magnetically attractive material, the magnetically attractive
material being carried outside the nonmagnetic tube. As the magnet
moves in a selected direction through the nonmagnetic tube, it
carries the collected material with it to a barrier where movement
of the collected material is interrupted and the magnet continues
to move until the material is released from the magnetic field to
fall into a collection bin or the like. The magnet can then be
returned through the nonmagnetic tube to repeat its cycle. The
magnetic element can be either a permanent magnet or an
electromagnet.
In the embodiment of FIG. 11, for example, the connectors 436 may
be in the form of insulated wire to carry current from a source of
direct current to an electromagnet 422. Conductors may also be
applied to the inner surface of the tubes 420 for sliding
electrical engagement with electromagnetic elements movably mounted
in the tubes. The magnetic element can be completely sealed from
the surrounding environment permitting the apparatus to be inserted
into liquids, powders, and preventing contamination from the
ambient atmosphere.
While specific embodiments of the invention have been disclosed in
the accompanying drawings and described in the foregoing
specification, it should be understood that the invention is not
limited to the exact construction shown. Alterations in the
construction and arrangement of parts, all falling within the scope
and spirit of the invention, will be apparent to those skilled in
the art.
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