US2058833A - Vibratory screen - Google Patents

Description

Oct. 27, 1936- R. F. SCHNEIDER ET AL 3 VIBRATING SCREEN Filed A rilgs; 1 934 a Sheets-Sheet 2 E y LOU/ 76/ MyM Oct. 27, 1936. R. F. SCHNEIDER ET AL 2,058,833

VIBRATING SCREEN M 3% 7/MWM Patented Oct. 27, 1936 VIBRATGRY SCREEN Ray F. Schneider and Louis B. Kuhlengel, St.

Louis, Mo,

assignors to Williams Patent Crusher and Pulverizer Company, St. Louis,

Mo, a corporation of Missouri Application April 26, 1934, Serial No. 722,447

Referring by numerals to the accompanying drawings, It] indicates a stationary frame or member on which is movably supported by flexible means H a vibratory frame I2 in which is arranged a screen [4. The stationary frame It] comprises side members I5 and transverse mem- 9 Claims.

Thisinvention relates to vibratory screens for grading or sifting granular or pulverant material.

One of the objects of the invention is to pro vide a screen which is flexibly supported and can be vibrated by the rotation of an unbalanced weight or member fixed to a revoluble shaft and journaled in bearings on the vibratory frame carrying said screen.

Another object of the invention is to provide novel means for flexibly supporting the vibratory screen at a plurality of points on a stationary member whereby said screen is free to move with in a predetermined range in all directions.

Further objects of the invention are to provide an improved means for flexibly supporting the vibratory screen, said means comprising bearings fixed each to a screen frame and to a stationary supporting frame and an arm pivotally connected to the bearing of one of said frames and having a flexible connection with the bearing of the other frame.

Still furtherobjects of the invention are to provide a device of the class described having a full floating vibratory screen and having a feed inlet arranged above one end of said screen and having a hopper provided below said screen and terminating in a discharge outlet for fine material, the other end of the screen forming a discharge outlet for coarse material.

Additional objects of the invention are to provide a vibratory screen device of the class described which can be economically manufactured and operated and which is highly eflicient in performing its intended functions.

With these and other objects in view, our invention consists in certain novel features of construction and arrangement of parts, hereinafter more fully described and claimed, and illustrated in the accompanying drawings, in which- Figure 1 is a top plan View of our device.

Figure 2 is a side elevational view of same.

Figure 3 is an enlarged cross section taken on line 3--3 of Figure 2.

Figure 4 is an enlarged detail cross section taken on line 4--4 of Figure 1.

Figure 5 is an enlarged detail cross section taken on line 55 of Figure 1.

Figure 6 is a front elevational view of the weights with the shaft broken away.

. Figure 7 is an enlarged detail cross section of the vibratory structure.

Figure 8 is an enlarged detail cross section showing the mounting of the shaft bearings.

Figure 9 is a cross sectional detail view showing a modified form of bumper for the screen.

bers l6 and H.

Said frame can be supported in any suitable manner and preferably is suspended by means of cables I8 from a suitable overhead support (not shown), there being inverted U- shaped bolts I 9 arranged in said frame It] for attachment to cables [8.

Vibratory member or screen frame I2 is of box-shape and is disposed above frame i0.

It is of smaller size than the opening defined by side members l5 and end members I6 and ll of said frame In. Frame l2 consists of side walls 20 and a rear end wall 2|, the forward end being open. It can be of any suitable construction, such as sheet metal and angle iron.

The screen I4 is detachably arranged within frame I2.

It is removably supported therein by side members 22 of the screen. The longitudinal edges of the screen are attached to the lower edges or flanges 24 of members 22.

These flanges to the latter.

Thus screen I4 is detachably supported within frame l2 and can be easily removed therefrom for cleaning or repair purposes or for replacement by another screen of different mesh.

The forward end Ma of screen E4 is extended outwardly past the open front end of frame l2. The forward ends of side walls or side members 22 also extend outwardly as indicated at 22a.

A feed inlet 30 is secured to screen frame 52 at the rear or high end of screen l4, whereby a suitable feed conduit (not shown) can be connected to said inlet. Secured to the underside of frame l2 and extending under screen 14 is a bottom member or hopper 3 I. This member slopes downwardly and forwardly and is provided at its forward end with a downwardly opening discharge 5 The material is fed onto the screen through let 32.

The coarse material is discharged from the screen through the forward end I4a into a suitable receptacle (not shown).

The screen I4 is vibrated or agitated by the actuation of unbalanced members or weights 34. These weights are secured to a revoluble shaft 35 which is transversely disposed above said screen and is journaled in bearings 36 fixed to the side walls 20 of vibratory frame I2. These bearings are preferably of dust-proof type.

One end of shaft 35 has fixed thereon a pulley 31 over which operates a belt 38 driven by a pulley 39 of a motor 46. This motor is preferably mounted on the rear end member I6 of frame I6.

In order to facilitate the assembly and removal of weights 34, the latter are preferably each formed of two medial sections clamped together on the shaft 35 by bolts M. The intermediate portion of the shaft is preferably formed square or non-circular in cross section, as indicated at 35a, and the half sections of members 34 are formed with correspondingly angular or non-circular seats to fit over said non-circular portions 35.

As stated before, the vibratory frame I2 and parts carried thereby are flexibly supported on the stationary frame II] by means II. Preferably there are four of these flexible means arranged in pairs on each side of the device. Each of said means includes a bracket 44 fixed to frame III, a stud member 45 fixed to the side walls 20 of frame I2, and a pair of arms 46 and 41, respectively, each having a pivotal engagement with member 45 and a flexible engagement with bracket 44.

Each bracket 44 has a base 48 which rests on top of longitudinal member I5 of frame Ill and is securely held in any suitable manner. Projecting upwardly from said base and formed integrah ly therewith is a cylindrical extension 49 having a vertically disposed bore 49a. A horizontally disposed cylindrical extension 50 is formed integral with each bracket and is integrally connected with base 48 by a flange 5| and with the vertical extension 49 by a member 52. A horizontally disposed bore 5% is formed in extension 56 and the axis of this bore is disposed in the same vertical plane with the axis of bore 49a.

A coiled spring 54 is arranged in each bore 49a and 50a and one end of each spring bears against the inner end of a plunger 55 which latter is slidably mounted in the outer end of each bore. The outer end of each plunger 55 is formed with a seat 56 adapted to receive the free end of the vertically disposed arm 46 in the case of extension 49 and of the horizontally disposed arm 41 in the case of extension 56. Each seat or socket 56 is formed semi-spherical and flares outwardly as indicated at 56a.

' The stud member 45 has a base or plate 45a from which projects a stud portion 45b terminating in a reduced screw-threaded portion 450 The plate 45a is secured to the side wall 20 of the vibratory frame I2 with the stud portion 45b extending horizontally and laterally from the latter. Arm 46 has one end formed with a bearing 460. which engages said stud, and arm 4'! has a similarly formed bearing 41a on one end to fit over said stud 45b in juxtaposed relationship with the bearing 46a of arm 46.

Each arm 46 has its opposite end terminating in a spherical enlargement 46b which fits in the semi-spherical socket or seat 56 of plunger 55 arranged in the corresponding bearing or extension 49. Similarly each arm 41 has its opposite end formed with a spherical enlargement 41b for engaging the seat 56 of plunger 55 disposed in the corresponding horizontal bearing or extension 50.

Since the bearings 49 and 56 are disposed in the same vertical plane and the pivotally mounted ends 4611. and 41a. of the respective arms are disposed side by side on the studs 45b, it is obvious that one or both of said arms have to be offset along their longitudinal axis to permit the proper assembly thereof. In the instant case, only the horizontally disposed arms 4'! are offset, as indicated at 410, the pivotal ends 41a of said arms being arranged to one side of the common vertical plane and preferably inwardly of ends 46a of arms 46.

The ball and socket engagement of arms 46 and 41 with plungers 55 forms flexible support for the frame I2 and screen I4 so that these can move or vibrate freely when the unbalanced weights 34 are actuated by the operation of shaft 35. The coiled springs 54 contained in bores 49a of bearings 49 form a resilient support for the vibratory structure.

It is desirable to provide adjustment for the springs 54 contained in horizontal bearings or extensions 50 so that the frame I2 and screen I4 can be properly located. The bearings 50 are arranged on each side of the vibratory structure with the plungers 54 presented inwardly in opposed relation with each other. A follower plate 58 is arranged in each bore 50a and is interposed between the inner end of each spring and the outer or closed end of said bearing. The last mentioned end is formed with a screw-threaded bore and receives a screw 59, the inner end of which bears against the follower plate 58. Thus by adjusting said screw 59 in the proper direction, the tension of the respective spring can be reduced or increased, thereby permitting slight shifting of the frame I2 and screen I4 in a horizontal plane. The outwardly flared mouths 56a of sockets 56 permit the arms to move angularly in any direction with respect to the longitudinal axis of the corresponding bearings.

A nut 60 serves to lock each bolt 59 in adjusted position. Each vertical arm 46 is provided with a rubber collar 6! which closes the upper end of bore 49a and prevents dust from entering the bearing formed in plunger 55.

In order to prevent sagging of the screen I4 each side member 22 and wall 26 is provided with a number of coinciding apertures in which are received bolts 62. A nut 63 is screw-threaded on the outwardly presented screw-threaded end of each bolt and bears against the outside of wall 26. Thus by turning said nuts in the proper directions, the side members 22 are moved outwardly toward the respective side walls 20, thereby stretching the screen I4.

Shaft bearings 36 are preferably mounted on angle members 64, which latter are secured to sides 26 in any suitable manner, such as by welding. A cross tie or member 65 has its ends secured to said angle members 64 above side walls 20 and extends transversely of the frame I2 parallel with shaft 35 and serves to strengthen and steady the supporting carrying bearing 36.

The frame I2 contains several cross pieces 66 extending transversely of said frame below screen I4 and each having its ends connected to the side walls 26. Each cross piece 66 is preferably angle-shaped in cross section with the vertical flange presented upwardly and the horizontal flange presented forwardly. A series of spacedapart rubber bumpers 61 is fixed on one or more cross pieces 66. These bumpers or impact members project upwardly above the edge of the upwardly presented flange of the cross piece and normally are spaced from the screen [4.

During the operation of the device, the screen comes in contact with said bumpers and receives a shock which serves to dislodge any particles of material that may have become lodged in the meshes of the screen.

A pair of straps 68 and 69 can be attached to the opposite sides of the screen longitudinally thereof and spaced so as to engage the corresponding bumper 61, thereby distributing the impact throughout the whole length of the screen.

In the modified form shown in-Figure 9, a bumper Iii extends substantially the entire width of screen Hi.

If desired, a cover ll, shown in dot-and-dash line in Figure 2 can be used to close the top of box frame [2.

Preferably the rotation of the unbalanced weights 34 is anti-clockwise, as indicated by arrow in Figure 2. This causes the screen to move rearwardly in its upward movement, thereby producing tendency to retard the forward flow of material and assure a more efiicient screening action.

The device can be given any inclination desired by adjusting the cables H! of the respective ends of support I I. These suspension cables act as shock absorbers and prevent the transmission of the vibratory movement from the machine to the building in which the device is located.

While we have shown and described herein the preferred forms of our invention, it is to be understood that various changes in the construction and arrangement of parts of our vibratory screen can be made and substituted for those herein shown without departing from the spirit of our invention.

We claim:

1. A vibratory screen device comprising a sta tionary support, a vibratory frame, a screen arranged in said frame, trunnions arranged on the sides of said'frame, one near each end thereof, bearings arranged on said support, a coiled spring arranged in each bearing, a follower in each bearing engaging the outer end of said spring, and a plurality of arms, each having one end formed with a bearing for engaging one of said trunnions and having the other end forming a ball and socket connection with the follower of the corresponding bearing whereby said vibratory frame is flexibly and resiliently supported on said support.

2. A vibratory screen device comprising a stationary support member, a vibratory frame member arranged above said support member, trunnions arranged on the sides of said vibratory frame member, one near each end thereof, bearings arranged on said support member, a coiled spring arranged in each bearing, a follower disposed in each bearing and engaging the outer end of the spring, a plurality of arms each having one end formed with a bearing engaging one of said trunnions, a ball and socket connection between the other end of said arm and the follower of the corresponding bearing, whereby said frame is flexibly and resiliently supported on said support, a screen arranged in said Vibratory frame, and means for imparting vibratory motion to said frame and screen.

3. In a device of the class described, the combination of a stationary support, a vibratory frame arranged thereabove, a plurality of bearings fixed to said stationary support, each bearing having an upwardly presented bore, a plunger resiliently and slidably mounted in the bore of each bearing and having its upper end formed with an upwardly presented socket, a plurality of arms each of which has a fixed pivotal engagement with said vibratory frame and has one end ball shape and resting in the socket of the corresponding plunger whereby said vibratory frame is resiliently and flexibly supported on said stationary support, a screen arranged in said vibratory frame, means for imparting vibratory motion to said frame and to said screen, and a plurality of flexible connections between said support and said vibratory frame for limiting the vibratory motion of the latter.

4. In a device of the class described, the combination of a stationary support, a vibratory frame arranged thereabove, a plurality of bearings fixed to said stationary support, each bearing having an upwardly presented bore, a plunger resiliently and slidably mounted in the bore of each bearing and having its upper end formed with an upwardly presented socket, a plurality of arms each of which has a fixed pivotal engagement with said vibratory frame and has one end ball shape and resting in the socket of the corresponding plunger whereby said vibratory frame is resiliently and flexibly supported on said stationary support, a screen arranged in said vibratory frame, means for imparting vibratory motion to said frame and to said screen, and means connected to said support and said frame for limiting the vibratory motion thereof.

5. In a device of the class described, the combination of a stationary support, a vibratory frame arranged thereabove, a plurality of bearings fixed to said support each having an upwardly opening bore, a plunger slidably mounted in the bore of each bearing and forming an upwardly presented socket, a plurality of arms each of which has one end pivotally mounted on said vibratory frame and has its opposite end formed ball shape and resting in the socket of the corresponding plunger whereby said vibratory frame is flexibly mounted on said support, means connected to said support and said frame for limiting the movement of the latter, a screen removably arranged in said frame, unbalanced weights revolubly mounted on said frame for imparting when actuated vibratory motion to said frame and screen, and a motor mounted on said support for operating said revoluble unbalanced weights.

6. In a vibratory screen construction, the combination of a stationary frame, a vibratory frame arranged thereabove, a plurality of bearings fixed to said stationary frame, each of said bearings having an upwardly presented bore, a coiled spring arranged in each bore, a plungerslidably mounted in each bore and supported on the upper end of each spring, each plunger having its upper end formed with an upwardly opening socket, a plurality of arms each having one end operatively mounted on said vibratory frame and having its opposite end ball shape and engaging the corresponding socket whereby said vibratory frame is flexibly supported by said support frame, a screen removably arranged in said vibratory frame, and means for imparting vibratory motion to said vibratory frame and said screen.

7. In a device of the class described, the combination of a stationary support frame, a vibrating frame, a plurality of arms, means for pivotally connecting the outer end of each arm. with said vibrating frame, a plurality of bearings fixed on said support frame and provided each with a longitudinally disposed bore, a coiled spring in each bore, a plunger slidably mounted in each bore and engaging said spring, the other end of each arm having a ball and socket engagement with said plunger, whereby said vibrating frame is resiliently and flexibly supported on said support frame.

8. In a device of the class described, the combination of a stationary support frame, a vibrating frame, a plurality of arms, means for pivotally connecting the outer end of each arm with said vibrating frame, a plurality of bearings fixed on said support frame and provided each with a vertically disposed bore, a coiled spring in each bore, a plunger slidably mounted in each bore and resting on said spring, the outer end of each arm having a ball and socket engagement with said plunger, whereby said vibrating frame is resiliently and flexibly supported on said support frame, and means for limiting the movement of said vibrating frame in a horizontal plane.

9. A vibrating screen device comprising in combination a stationary frame, a vibrating frame, a screen carried by the latter, a plurality of arms arranged in pairs, one of which is disposed horizontally and the other vertically, each of said arms having one end formed apertured, a plurality of studs attached to said vibrating screen and extending laterally therefrom for pivotally engaging the coaxially apertured ends of each pair of arms, a plurality of bearings fixed to said stationary frame, each having a pair of tubular members, one of which is disposed coaxially with and slidably receives the lower end of said vertically disposed arm and the other of said tubular members is disposed coaxially with and slidably receives the outer end of said horizontally disposed arm, and a coiled spring in said vertically disposed tubular member to form a resilient support for said vertical arm.

RAY F. SCHNEIDER. LOUIS R. KUHLENGEL.

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