US2251678A - Vibratory conveyer and screen - Google Patents

Description

Au .5;1941. A, D, H| 2,251,678

VIBRA'IORY CONVEYER AND SCREEN v Filed Dec. 31, 1938 [/YVE/VTORI v .ARTHUR D1 HOL ATT'Y Patented Aug.'5 1941 UNITED STATE VIBRATORY comma AND scar-zen 'Arthur 1). Bolt, Columbus, Ohio, ammo: to The Taylor-Vibrator Company, a corporation of Colorado Application December 31,1938, Serial No. 248,768

2 Claims.

This invention relates to a vibratory conveyer or feeder and screen or grating adapted to feed material and effect a size classification thereof.

.An object of the invention is to provide a feeder or conveyer of the above mentioned type in which the screening component of vibratory motion is greater with respect to the screenin surface or grating than with respect to the conveying surface.

Another object of the invention is to provide an improved screen, grating or grizzly of rugged construction.

Other objects of the invention will appear hereinafter, the novel features .and combinations being set forth in the appended claims.

In the accompanying drawing,

Fig. 1 is a side elevational view of the device of my invention;

Fig. 2 is a front view of the deck thereof and Fig. 3 is a schematic view showing by vectors the relative components of motion of the deck of the conveying surface and the screening surface.

I have found in practice that where a screen,

grating or grizzly is provided adjacent the end a.

. of the deck of a vibratory feeder this screen, grating or grizzly will operate more efficiently if the screening component of motion or the component of motion at right angles to the general plane thereof is increased over that customarily employed to effect the conveying action over the conveying surface of the feeder. The combined conveyer or feeder and screen, grating or grizzly comprising my invention incorporates structure which produces this improved result.

Referring to the accompanying figures of the drawing it is to be seen that I have provided a device comprising a deck or .pan III having appropriate side walls H, II, a sloping rear wall I: and an imperforate material supporting and The spaced bars Ii are placed on edge and near their rear ends are permanently attached, as by welding, to a cross-piece in the form of a bar It to-which are rigidly attached, as by welding, end plates ll adapted to be rigidly but removably attached to the side walls ll of the deck HI by removable bolts l8. Adjacent their forward ends the bars I5. are welded to a crosspiece in the form of a bar having end plates 2i adapted to be attached to the sidewalls ll of the deck ill as by bolts l9.

By reference to Fig. 1 of the drawing it is to be particularly noted that the general plane of the screen, grating or grizzly i4 slopes downwardly from the general plane of the imperforate bottom I3 and in the drawings this angled slope is" shown as'20 degrees. It is to be understood, however, that this angle may be other than 20 degrees either in a positive or negative James A, Flint for a Vibratory feeder and screen,

Serial No. 73,318, flied April 8, 1936,

conveying bottom II, As illustrated in the draw-.-

ing, the imperforatelbottom i3 is concavely curved, but this is not essential as it may be flat or may be convexly curved.

Adjacent the forward end of the deck Ill andpositioned to receive material which is discharged over the forward or discharge end of the imperforate bottom I: is a screen, grating or grizzly It. This screening, grating or grizzly ll comprises a plurality of substantially parallel spaced bars l5 which are generally of tapered construction, the tops of which progressively decrease in width from the top of the grating to the bottom thereof, as clearly illustrated in Fig. 2 of the drawing.

Briefly described, the vibratory motor 22 comprises a main frame or main casting 23 having an elongated transversely extending slot 24 through which extends a plurality of stackedspring bars 25, the opposite ends of which are rigidly clamped in said main frame 23. To the centers of the spring bars 25 there is clamped a vibratory armature shaft 26 which has a crosshead removably attached to the deck in as by bolts 21. The rear end of the armature shaft 26 isprovided with a bracket 28 carryingan armature 29 preferably made of laminated steel which is adapted to be attracted by a field structure 20 including a U-shaped core 3| which is energized by a pair of coils 32 carried by brackets 23. The field structure 30 is adiustably supported by adjusting bolts 34 on a pair of U-shaped brackets, one of which is seen at 35, which brackets are rigidly attached at their hottoms or upper ends to the main frame 23. The

main frame 23 is also provided with resiliently deck l0 and the armature shaft 26 is a bracket it! which substantially reduces the twisting torsion on the bars 25. -The forward end of the spring supports, one of which is seen at 31.

In the operation of the device, the material to be fed or conveyed and screened is delivered to the deck 10 preferably adjacent the rear wall l2 and onto the imperforate bottom l3. Vibratory motion imparted to the deck ill by the vibratory motor 22, which is energized with either alternating, mixed or rectified pulsating current, is along the rectilinear axis of the armature shaft 26 which axis makes an acute angle with the general plane of the imperforate bottom 13. This angle may be at any value between relatively wide limits and in the drawing it is illustrated as approximately 20 degrees. The action of the deck I'll under the influence of the vibratory motor 22 to convey and screen material will be clearly understood by reference to Fig. 3 of the drawing.

The imperforate bottom [3 is diagrammatically illustrated as substantially horizontal and the screen, grating or grizzly H is diagrammatically illustrated as inclined thereto at an angle of 20 degrees which, as aforesaid, may be varied. The vibratory motions of the imperforate bottom l3 and the screen I are represented by the parallel vectors M and M, respectively. These vectors M and M will, of course, have the same value and direction because any point on the deck will have the same amplitude of vibratory motion since the deck vibrates rectilinearly. It'is evident, however, that the horizontal component of the vector M with respect to the general plane of the imperforate bottom l3, which is seenat H, is greater than the horizontal vector H with respect to the plane of the screen ll. Also, the vertical component V of the vector M is less than the vertical component V of the vector M.

The conveying action of the imperforate bottom l3 and the screen It is, of course, due to the fact that there are both vertical and horizontal components with respect to the planes of each in the vibratory motion of the deck I.

It is common to designate the horizontal components H, H as the conveying components because the values of these components determine, at least to a large extent, the amount of conveying action which is realized. Likewise, the upright components V and V are commonly designated the screening components because they are largely effective to force material through a screen provided there is a screen present. It is, of course, to be understood, however, that some vertical component is necessary to produce the conveying action on the imperforate bottom iii, if it is horizontally positioned.

Since the upright component V' is greater than the vertical component Vit is evident that there is a greater proportion of screening action derived from the vibratory movement onthe screen, grating or grizzly M, where it is desired, than on the imperforate bottom II where it may be relatively small since no screening action is here effected. In other words, by sloping the screen,

grating or grizzly H with respect to the imperforate bottom IS, the vibratory motion of the deck l0 produce a greater screening component of movement over the screen, grating or grizzly I4 where 'it is desired, to effect a screening action, than over the imperforate bottom l3 where no screening action takes place. As a consequence, there will be a more emcient screening of the material in passing over the screen, grating or grizzly ll than if it were parallel with the imperforate bottom l3.

As above pointed out, some vertical component is necessary to effect the conveying action on the bottom I3 and this, of course, is desirable if the bottom I3 is to be placed horizontally, as it frequently is in practice. However, the maior portion of the conveying action is due to the component H. when the screen, grating or grizzly I4 is reached it will substantially always be sloping downwardly and for this reason it is not essential that any conveying component H at all be present because gravity alone will cause material to flow over this screen, grating or grizzly I particularly if it is vibrated and this vibratory motion may be entirely vertical with respect to the general plane thereof.

In other words, I may slope the screen, grating or grizzly ll so that it is substantially at right angles with the longitudinal axis of the armature shaft 28 or, in other words, at right angle to the vectors M and M. It is, of course, evident that in such a case the vectors M and V' will coincide or, in other words, all of the vibratory motion as measured from the plane of the screen, grating or grizzly ll will be at right angles thereto and produce a screening action.

It is thus to be seen that when material is fed to the apparatus of my invention it will be conveyed along the imperforate bottom [3 which may be horizontal, upwardly sloping or downwardly sloping, from which it will discharge over the front end thereof onto the screen, grating or grizzly M by which it will be screened with the large particles of material discharging over the lower end of said screen, grating or grizzly I4 and the smaller particles passing therethrough.

Furthermore, the screening component of the vibratory motion will be greater with respect to the screen, grating or grizzly l4 than with respect to the bottom It, thus insuring a very eftlcient screening action on the material to remove all of the under-size.

In addition, the slope of the screen, grating or grizzly II will increase the velocity of'material flow thereover, thus thinning it out and aiding in eflecting an efficient screening thereof. There is another important action produced by this sloping of the screen, grating or grizzly H, which prevents clogging and insures removal of the fines. As the material leaves the bottom I3, it breaks open which breaking is followed by the thinning out on screen I. This is very important, particularly with material that tends to matt during conveying, as it insures free movement of the fines through the screen I4. It is also an important factor that the very rapid vibratory movement of this type of conveyer tends to classify the material as to size, with the fines in the bottom stratum.

Obviouslythose skilled in the art may make various changes in the 'details and arrangement of parts without departing from the spirit and scope of the invention as defined by the claims hereto appended, .and I therefore wish not to be restricted to the precise construction herein disclosed.

Having thus described and shown an embodiment oimy invention, what I desire to secure by Letters Patent of the United States is:

1. In a vibratory feeder and screen, the combination with a frame, of an imperforate deck mounted thereon, a bar screen mounted on said frame in position to receive material from said imperforate deck, and an electro-magnetic motor connected to said frame to vibrate the same rectilinearly along lines making acute angles with the deck and the bar screen, each forward movacomponent of movement and a horizontal component of movement and the bar screen having two components of movement one normal and screening and the other parallel and conveying, the normal component for thebar screen being greater than the upward component for the deck due to the rectilinear vibrations produced by said motor and the downward slope of the bar screen. 2. In a vibratory feeder, the combination with 10 a supporting frame, of a material receiving and conveying deck thereon with an imperforate bot- 1 tom, of a grating adjacent the discharge end of ment in the direction of flow having an upward said deck and sloping downwardly therefrom, and an electro-magnetic motor-having an armature rigidly secured to said frame to eflect-vibrations of said deck and said grating along rectilinear line's making acute angles with the direction of flow of material over said deck and said grating, each forward'movement of the deck having a vertical component and a forwardly extending horizontal conveying component and each forward movement of" the grating having a normal screening component greater than the aforesaid vertical component.

' a ARTHUR D. HOLT.

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