US1620213A

US1620213A - Vibration mechanism for screens

Info

Publication number: US1620213A
Application number: US739789A
Authority: US
Inventors: Edward T Keenan
Original assignee: Individual
Current assignee: Individual
Priority date: 1924-09-25
Filing date: 1924-09-25
Publication date: 1927-03-08
Anticipated expiration: 1944-03-08

Description

March 8, 1927.'Y 1,620,213

- E. T. KEENAN VIBRATION MECHANISM FOR SCREENS Filed Se'pt. 25. 1924 9.0.0.0; lui

Patented Mar. 8, 1927.

UNITED STATES EDWARD T. KEENAN, `Olli" BREWSTER, FLORIDA. Y

VIBRATION MECHANISM A non SCREENS.

Application filed September 25, 1924. Serial No. 739,789.

vide a sifting screen with an improved elec-k tromagnetically operated vibratory mechanism for vibrating the screen.

More specifically the invention contemplates the vibration Vof a sifter screen by a polarized plunger which is vibrated by alternating the direction of an external magnetic field to which the plunger is subjected. y

In the accompanying drawings, there is shown, for purposes of illustrating the invention, two of the many possible embodiments of the vibratory mechanism contemplated by the present invention, together with a vibratory screen actuated thereby, it being understood the drawings are merely illustrative of the invention, which may be embodied in various forms.

In these drawings:

Fig. 1 is a side elevation of a screen and vibratory operating mechanism, parts be ing broken away.

- Fig. 2 is an end view, taken from the right of Fig.` 1.

Fig. 3 is a section taken on the line 3-3 of Fig. 1, parts being omitted.

Fig. 4 is a detached view showing a screen coupling device; and

Fig. 5 illustrates a modified form of magnet structure.

The vibratory screen may be mounted on any convenient stationary supporting frame. A convenient form of supporting frame may be made from angle iron, as shown in the drawings. This frame has a base made up of a pair of longitudinal angles 10 and 11 connected by cross braces 12. The rear of the supporting frame is made up of a pair of vertical members 13, (only one of which appears in the drawing) and a cross member 14, at the front of the base there are two front vvertical members 15 (only one of which appears in the drawing) which are stiffened by a cross brace 16. The rear cross member 14 supports bearing members 17, which are pivotally supported bysimilar bearing members 18 carried underneath a screen frame 19. The lower end of the screen frame is` carried between the uprights 15, the screen frame and uprights being slotted as shown at 2O and 21, so that the screen frame may be adjustably clamped in position by bolts 22. It is, of course, intended that the screen be provided with suitable chutes for delivering the material to be screened and for caring for the sifted material andthe tailings, but these are omitted from the drawings for purposes of clearness. Y

The screen frame 19 carries a screen 23 made up of a suitable piece of screen metal 24 and side clamping and

shield members

25, 25, and 26, 26a, shown more in detail in Figure V4. Suitable tensioning devices 27 are provided for stretching the screen metal. The above described mounting of the screen on the screen frame is, of course, only one of the many ways in which it may be conveniently mounted.

The screen frame 19 is provided, at about the middle of its length, with trans

versey members

28 and 29, shown in the form of channels, which may conveniently be carried above the screen frame by means f the vibratory operating mechanism for agi- K,

tating the screen.

A transverse shaft 32 is mounted in bearings 33 carried on bearing supports 34 fastened to the transverse members 2S and This shaft is adapted to be power driven in any suitable manner, and is provided with a multipolar magnet structure 35. This structure is provided with exciting windings 3G so as to give the alternate piece 41 it attached to its upper end pref lll erably by `a tapered thread and a pin, as show-n.

The plunger is preferably energized by a solenoid coil 42 disposed between the

channels

28 and 29 so that a strong niagnetic pole is produced at the ends of the plunger. The lower end of the plunger is provided with an anvil block -43 adapted to engage an anvil block 44 supported from the transverse `frame in iany convenient manner, yas by a bridge 45. This bridge is provided lwitha tubular `member 46 lthreaded at its upper end to receive a threaded plug 47 This plug provides a convenient means vfor controlling the tension in a spring 4S housed inside the tubular member and upper yanvil block.

The coil 42 may be energized from any suitable source, and is shown as being placed in 'parallel with the windings of the rotary magnet structure. lt may, however, be connected in series, or one may generate the Iexciting current directly in the rotating structure, thereby rendering any external connection unnecessary.

The residual magnetism in the plunger, when the coil 42 is disconnected, is in some cases -suiiicient to cause the vibration, as the plunger is attracted by the rotating magnetic structure, and the weight of the screen and load and the spring forces the screen downward as the yiniiuence ceases. rl`here is also lin some cases sufficient self-polarization -to cause the screen to vibrate when the magnets are rtated.

The shaft 32 Ais adapted to be rotated at a convenient speed by any suitable source of power, Anot shown. The rotation of the shaft carries the alternate north and south polesof the magnet structure past the pole piece 41 and thereby subjects it to the influence ofthe alternation of the magnetic field induced =by the rotating magnet structure. The coil 42 lpolarir/.es fthe plunger in a predetermined manner. `When `the pole of `rotating ymagnet' structure is 'like the pole at the upper Iend ofthe Iplunger the niagnetic repulsion forces the plunger down wardly, this movement being, to some extent lassisted by the spring 48. lilhen, hovever, the rotating structure has turned to place the 'nent pole adjacent the pole piece of the plunger, the poles are unlike, and, Such poles attract, the plunger is brought upwardly. rlhe upward movement of the plunger is limited by the engagement of the anvil blocks 43 and 44, thereby preventing'the pole 4l from reaching the vrotating magnet structure. As rotation of the shaft 32 causes a rapid change in the magnetic field, this results in a rapid vibration of the plunger and whatever is attached to it. l1 the 'present case it causes a rapid vibration ofthe screen and agitates the material in a vigorous fashion. The speed may readily l'be controlled, and the device may be operated by either direct or alternating current.

In the modified form of magnet structure shown in Figure 5, the transverse frame Ymembers 28 and '29 carry laminated strips 50 and l whose upper ends 53 and 54 are adapted to be inagnetized by induction from a rotating magnet The lower ends and 56 of the strips 50 and 5l are brought close together thereby providing a better electromagnetic circuit, and the polo piece 4l'on the plunger 40 is disposed just below said

lower ends

55 and 56. The plunger will be alternately attracted and i'epelled as before.

lt is obvious that the invention may be embodied in many forms and constructions, and I wish it to be understood that the particular forms shown are but a few of the inanyforms. Various modifications and changes being' possible, l do not limit myself `in any iay with respect thereto.

That is claimed is:

l. ln combination, a supporting frame, a screen frame adjustably mounted on the supporting frame, a screen cari'ied from the screen frame, a niagnetizable plunger attac-hed to the screen and electromagnetic means for vibrating the plunger, 'icluding a rotatable magnet struct-ure bodily carried by the screen frame, said rotatable 'magnet structure alternately attracting and `i'epelling the plunger.

In combination, a supporting frame, a screen frame :djustably mounted on the supporting frame, a screen carried from the screen frame, a inagnetizable plunger attached to the screen, screen-frame supA ported guiding means for the plunger, and electromagnetic means for vibrating the plunger, including a rotatable magnet structure bodily carried by the screen frame, said rotatable magnet structure alternately attracting and repelling the plunger.

3. In combination, a supporting frame, a screen frame adjustably mounted on the supporting frame, a screen carried from thc screen frame, a magnetizable plunger attached to the screen and Vextending upwardly thereiironi, electromagnetic means for vibrating the plunger, including a `rotatable magnet structure bodily carried 'by the screen frame, and means for limiting the upward movement of the plunger, said rotatable magnet structure `altei'natelv attracting and repelling thc plunger.

4. ln combination, a supporting iframe, a screen. frame adjustably mounted on the supl'iorting frame, a screen carried from the screen frame, a inagnetizable plunger attached to the screen, a rotatable shaftbodily carried by the screen frame, and electro` magnetic means for vibrating the plunger. including a magnet structure carried by the Yshaft `to rotate therewith, said rotatable V lli() lill magnet lstructure alternately attracting and repelling the plunger.

` 5. In combination, a screen trame, a screen carried by the frame, a plunger connected to the screen to vibrate the screen, and means to vibrate the plunger, comprising a stationary solenoid surrounding the plunger to magnetize it, and a rotatable magnet structure disposed adjacent the tree end ot the plunger to subject the plunger to the influence of the alternation of the magnetic field as the magnet structure is rotated whereby the plunger is vibrated.

6. In combination, a screen frame, a screen carried by the trame, a plunger connected `to the screen to vibrate the screen, and

means to vibrate the plunger, comprising a stationary solenoid surrounding the plunger to magnetize it, and a rotatable magnet structure disposed adjacent the free end of the plunger to subject the plunger to the infiuence of the alternation of the magnetic field as the magnet structure ris rotated whereby the plunger is vibrated, said rotatable magnet structure being supported from the screen frame.

7. In combination, a screen trame, a sci'een carried by the 'rame, a-plunger connected to the screen to vibrate the screen, and means to vibrate the plunger, comprising a stationary solenoid surrounding the plunger to magnetize it, a transverse shaft rotatably carried above the screen trame, and a magnet structure carried on the sha-tt and disposed adjacent the tree end of the plunger `to subject the plunger to the influence ot the alternation ot the magnetic field as the magnet structure is rotated whereby the plunger is vibrated. y Y Y 8. In combination, a screen frame, a screen carried by the frame, a plunger connected to the screen to vibrate the screen, and means to vibrate the plunger, comprising a stationary solenoid surrounding the plunger to .magnetize it, a transverse shaft rotatably carried above the screen trame, a magnet structure carried on the shaft and disposed adjacent the free end of the plunger toV subject the plunger to the inuence of the alternation of the magnetic field as the magnet structure is rotated whereby the plunger is vibrated, exciting windings for the magnet structure and collector rings for connecting the windings to an external circuit.'

9. In combination, a screen traine, a screen carried by the frame, a plunger connected to the screen to vibrate the screen, and means to vibrate the plunger, comprising a stationary solenoid surrounding the plunger to magnetize it, a transverse shaft rotatably carried by the screen frame above the screen, and a magnet structure carried on the shaft and having alternate north and south poles adapted to be brought adjacent the free end of the plunger.

10. In combination, a screen frame,-'a screen carried by the traine, a plunger Aconnected to the screen to vibrate the screen,

Vand means to vibrate the plunger, comprising a stationary solenoid surrounding the plunger to magnetize it, a transverse shatt rotatably carried by the screen trame above the screen, a magnet structure carried Von the Ashaft and 'having alternate north and south poles adapted to be brought adjacent the free end of the plunger, exciting windings for the magnet structure and collector rings for connecting the windings-to an external circuit.

11. In combination, a traine, a multipolar magnet structure rotatably supported from the frame, a polarized armature reciprocably carried by said iframe in a position to be attracted or repelled by the magnetic field induced by the magnet structure, and a screen connected to the armature to be vibrated thereby.

l2. In combination, a trame, a niultipolar magnet structure rotatably supported from the frame, av polarized armature reciprocably carried by said frame in a position to be attracted or repelled by thel magnetic field induced by the magnet structure, an energizing coil for the armature, and a screen connected to the armature to be vibrated thereby.

18. In combination, a trame, a sha-tt rotatably carried on the trame, a inultipolar magnet structure having alternate north and south poles and coupled to the shaft, exciting windings for the magnet structure, collector rings for connecting the windings to an external circuit, a polarized armature carried on the frame in a position to heA alternately attracted and repelled when the magnet structure4 is rotated, and a device attached to the free end ot the armature to be vibrated thereby.

lll. In combination, a frame, a shaft rotatably carried on the frame, a multipolar magnet structure having alternate north and south poles and coupled to the shaft, exciting windings for the magnet structure, collector rings for connecting the windings to an external circuit, a polarized armature carried on the vtrame in a position to be alternately attracted and repelled when the magnet structure is rotated, a magnetizing coil for the armature in parallel with the exciting windings, and a device attached to the free end of the armature to be vibrated thereby.

15. In combination, an obliquely disposed screen carried on a trame, a plunger connected to the free part of the screen, and guided for reciprocation perpendicular to the screen, a solenoid coil for magnetizing said plunger so that its free end has a predetermined polarity, a magnet structure rotatably carried adjacent the free end of the IIU Cil

plunger and 'having alternate -north and south poles, and means to rotate said struc* ture whereby the .plunger .is alternately Aattracted and repelled.

16. In combination, an obliquely disposed screen carried on a frame, `a plunger connected to the free part ot the screen, and guided for reciprocation perpendicular 4to the screen, a .solenoid coil for magneti-Zing said plunger so `that its rtree end has a predetermined polarity, a magnet structure rotatably carried adjacent the free end of the plunger and having alternate north and south poles, means to rotate said structure whereby the plunger is alternately attracted and repelled, and means to prevent the plunger and magnet structure 'from coming in contact.

17. In combination, a screen, a strap carried underneath the screen, a plunger attached to the strap and extending perpendicularly above the screen, means for guiding' the plunger to permit it to reciprocate longitudinally, a solenoid coil surrounding the plunger, a pole piece carried bythe lvfree end of the plunger, a movable magnet structure, and means to bring alternate north and south poles adjacent the pole piece whereby t-he pole piece is alternately attracted and repelled.

18. In combination, a screen, `a strap carried underneath the screen, a plunger attached to the strap and extending perpendicularly above the screen, means for guiding the plunger to permitit to reciprocate longitudinally, a solenoid coil surrounding the plunger, a pole piece carried by the free end of the plunger, and a rotatable magnet structure disposed adjacent the free end of the plunger to subject the plunger to the influence of the alternationoif the magnetic field as the magnet structure is lrotated whereby the plunger is vibrated.

19. In combination, a screen, a strap car- :reed-'2113 longitudinally, a solenoid coil surrounding the plunger, a pole piece carried by the free end of the plunger, and a rotatable ymagnet structure disposed adjacent Jthe tree end oi the plunger to subject the plunger to the influence of the alternation of the magnetic field as the magnet structure is rotated whereby the plunger is vibrated, said rotatable magnet structui-'e being supported Afrom the screen frame.

20. In combination, a screen frame, a screen carried by the iframe, transverse trame members carried from the screen frame above the screen, a plunger whose lower end is attached to the screen, guiding `means for the plunger supported from the transverse members, a shaft rotatably supported from the frame and carried above the transverse members, a magnet structure having alternate north and south poles and mounted on the shaft, in line with the free end of lthe plunger, and a solenoid coil to energize the plunger.

2l. In combination, la screen yframe, a screen carried by the trame, transverse frame members carried from the screen 'frame above the screen, a plunger whose lower end is attached to the screen, guiding means for the plunger supported 'from the transverse members, a sha'tt rotatably supported from lthe frame and carried above the transverse members, a magnet structure having alternate north `and south poles and mounted on the shaft, in line with the free end oi the plunger', a solenoid coil to ener Vgize the plunger, means to limit the upward movement of the plunger, and a spring tending to move the plunger downwardly.

EDWARD T. KEENAN.