US1423370A - Revolving shaker screen - Google Patents

Description

J. C. UHLARIK.

REVOLVING SHAKER SCREEN.

APPLICATION FILED JUNE le. |919. RENEWED DEC. 7,1921.

l ,423, 370, Patented J uy 18, 1922.

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J. C. UHLARIK.

REVOLVING SHAKER SCREEN.

APPLICATION FILED IuNE I6. 1919. IIENEWED DEC. 7.192I.

1,423,370. PaIenIedJuly 18,1922.

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JULiJt-Is C. UHLARIR, OE VALHALLA, NEW YORK, AssIGNOR To RoBrNs CONVEYING BELT Co., A CORPORATION OE NEW JERSEY.

REvoLvING SHAKER SCREEN.

Mesero.

Specification of Letters Patent.

Patentedfluly 18, 1922.

Application filed June 16, 1919, Serial No. 304,619. Renewed December 7, 1921. Serial No. 520,762.

T0 all whom t may concern:

Be it known that I, J ULIUs C. UHLARIK, a citizen of Hungary, residing at Valhalla, 1n the county of Westchester and State of New York, have invented a new and useful Improvement in Revolving Shaker Screens, of

- which the following is a lspecification.

One object ofy my invention is to provide a screen for efficiently separating random sized particles vof coke, coal, or other material into particles of uniform sizes b y 1mparting to thescreen and the materlal an improved vibratory motion havmg a co nsiderableupward component to agitate and sift the smaller particles through the screen and to jar the larger particles olf the screen.

Another object of my invention is to p ro vide an oscillating screen frame carrying a screen`\plate havinga complex cycle of motion in which half of each cycle imparts a centrifugal throw to the particles to agltate and prevent themfrom clogging the holes in the screen plate, and also to provide 'means for producing during each cycle a 25- jar or shock. In the preferred construction, this result is attained by fastening the screen plate at each end only, leaving the central portion loose and thus free to flap up and down 0n the screen plate frame.

Another object of my invention is to effect such screening by an improved mechanism in which the oscillation of the screen frame and late is counterbalanced and thus localized where it does useful work, saving unnecessary wear and tear on the 'machine and its foundations.

Another object of my invention is to actuate -the screen plate by means of an improved mechanism having several parallel shafts provided with eccentrlcs driven in synchronism, to counterbalance the eccentric oscillatory motionof the screen plate and frame by weights 'positioned on thel shafts-A diametrically opposite to the throws of the eccentrics, and to cause the screen plate to vibrate without shaking its frame to pieces.

Another object of my invention is to -provide freedom of movement in the direction of the lengthfof the lscreen for the bearings of the driven shaft, for adjustment of the chain connecting it to the driving shaft,

and to prevent the wrecking of the machine in the event of the chain breaking and alor less longitudinally and horizontally,`

which imparts analogous movement to the material. This motion permits the long and 'irregular shaped particles to hang in the holes of the screen plate, thus clogging the holes and reducing the capacity of the screen. To dislodge these-particles all sorts of knockers have to be resorted to, and these `particles have sometimes to vbe removed byr an attendant provided with a Sledge hammer.' Then the older types of screens are run at a high speed, the clogging can be reduced, but the life of the screen is then materially shortened.

In operation, the-most conspicuous differencebetween my invention and the older types appears to be in the motion imparted to material on the screen. In the common types the material slides horizontally, the screen being set at an angle to the horizontal so that the sliding of the material takes 4place in a general downward direction. In

ing the speed of rotation of the eccentrics,

their degree of throw and the inclination of the screen. It is interesting to note that the motion of my screen is in an orbit or endless path in which the jarring of the loose central portion of the screen plate causes higher frequency vibrations to occur; however the general motion is in a more or less circular orbit rather than reciprocating.v and this feature facilitates counterbalancing.

In addition to the foregoing objects, others will appear from the detailed description and be pointed out in the claims.

Reference is made to the accompanying drawings forming a part of this specification and in which like characters indicate like parts throughout the several figures.

Fig. 1 is a plan view of my device, partly broken away in order to show some of the lower parts in full lines. i

Fig. 2 is a longitudinal sectional .elevation taken on line 2-2 of Fig. 1 looking 1n thedirection of the arrows.

Fig. 3 is a cross section taken on line 3-3 of Fig. 1.

Fig. 4 is a sectional view taken on line 4-4 of Fig. 3.

Fig. 5 is an enlarged sectional view taken on line 5-5 of Fig. 3.

Fig. 6 is a sectional view taken line 6-6 of Fig. 3.

Fig. 7 is a side elevation of ne of the shafts.

Fig. 8 is an enlarged cross section taken on the line 8-8 of Fig. 7.

Fig. 9 is a curve plotted to show approximately the cycle of motion of my screen:

The numerals 10 and 11 indicatethe side castings and the numerals' 12 and 13 the end castings which collectively constitute the base of my revolving shaker screen. These on the castings are bolted together by bolts 14 and 15 as best shown in Fig. 2. The base carries pillow blocks 16, 17, 18 and 19, each of which may be adjusted to the right or left as shown in Figs. 1 and 2 by means of the adjustment bolts 20, which "pass through lugs 21 in the castings 10 and 11. The adjustment provided by these bolts has a double purpose, first to facilitate thealignment of theshafts 22 and 23 and second -to facilitate the adjustment of the centers around which the chain 24 travels. y

The pillow blocks 16, 17, 18 and 19` are all similar, and each consists of a lower half 1 25 and a cap 26 as particularly shown in Fig. 6. The bolts 27 clamp the'upper and lower` halves of each pillow block together and the bolts 28 clamp the lower halves l25 to the castings 10 and 11. These bolts 27 and 28 pass through longitudinal slots 29. in the'castings 10 and 11 in order that the p1llow blocks 16, 17, 18 and 19 may be adjusted longitudinally by the adjustment bolts 20. The pillow blocks 16, 17 18 and 19 lare severally provided with grease cups 30.E

The driving shaft 22 `is provided (at `the left of Fig. 7) with a keyway 31, by which the sprocket 32 is fastened upon it; to the rightof the keyway 31 a Ajournal portion 33 is shown which is journaled in the pillow i block 18. At the right of the journal por- 34 is provided to hold one 'of tion a keywa lars 35 from rotation; at the the` split col v right of the keyway 34 a shoulder 36 and an eccentric 37 are provided; at the right the shaft 22 resumes its full diameter 38; at the right of the full diameter portion an eccentric 39, a shoulder 40, a keyway 41 for another split collar 35, a journal portion42, to be journaled in pillow block 16 and a keyway 43 to secure the main driving pulley 44 are shown..

The other shaft 23 is similar to shaft 22, excepting that it is not extended to contain a keyway corresponding to keyway 43 `of shaft 22. Shaft 22 may be driven through the pulley 44 from any source of power. Shaft 22 carries at the keyway 31 the sprocket 32 surrounded by the chain 24 which connects it in driving relation to the drivensprocket45 vwhich is keyed on the bolts 53 and 54. The screen plate frame consists of the side angle irons 56 and end angle irons 57, which are braced by gusset plates 58 and riveted to ether by rivets 59 as shown particularly inig. 1.

The end angle irons 57 are provided with round washers or spacers 60 which support the perforated screen plate 61.

Flat head machine screws 62 pass through the plate 61, the washers60 and the end angle irons 57 holding the plate 61 securely ateach end. The side angle irons 56 are provided with spacers 63 which are riveted to them by counter sunk-head rivets 64 as particularly shown in Fig. 1 and the spacers are beveled vat their right hand ends in order to permit any particles which may collect on top of the side anglev irons 56 to be jarred off towardthe center of thescreen plate 61.

It should be noted that thescreen plate 61 merely rests upon the spacers 63 and so is free to jar upon them as will be mor fully explained hereafter.v

At the sides of the angle irons56, strips 65' of bent sheet iron Vare attached lin any suitable manner-for the purpose of preventing the falling off, at the sides, of vmaterial passing down the incline of the screen. v

At the upper or right hand end ofthe screen plate 61 according'to Figs. 1 and 2,

deiector angle irons 66 are secured by rivets 67 to the screen plate 61 as best shown in A Fig. 1, to center the material flowing onv to ed bearing guides 68, which are bolted to the angle irons 56 by bolts 69. Between these guides and the angle irons56 are mounted bearings 70 and 71, for `the eccentrics 47 and 48 of shaft 23.-4 Each of these bearings coni sists of an upper half 7 00` and a lower-half- 701 which are bolted together with bolts 702.

the screen at the upper or right hand'end movement in the direction of the length of the screen as best shown in Fig. 2, to provide for the increase or decrease of the distance between the centers of the shafts 22 andY 23, which may be occasioned by the adjustment of the pillow blocks 16, 17, 18 and y19 or by any change in the distance between the eccentric centers, such for instance as either accidental breakage of the chain or, intentional or accidental nonsynchronism of the eccentrics.

Through the bearing guides 68 slots 73 are provided for the stems'74 of the grease cups 75 of the bearings70 and 71 which lubricate the eccentrics 47 and 48 of the shaft 23.

Shafts 22 and 23 are provided w1th split collars 35 as particularly shown in Fig. 5. These split collars each have anupper half 76 keyed to the shafts 22 and 23 by keys 77 and provided with set lscrews 770. Each split collar 35 also has a lower half 7 8, and the halves are clamped on to theV Ashafts 22 and 23 by bolts 79 having nuts and lock nuts 80. These bolts extend and pass loosely through the counterweights 81 and are fastened in place by the nuts and lock nuts 82.

` The counterweights 81 can be adjusted to or from the centers of the shafts 22 and 23 by adjusting the nuts 82 and thus provide for.

proper counterbalancing of the screen frame and the members attached to it. The counterweights are substantially diametrically oppositeto the throw of the eccentrics in order to relieve vibration from pillow blocks 16, 17, 18 and 19 and the members supporting them.

Referring to Fig. 9 in which a curve of the cycle of motion of the middle portion of the screen plate 61 and the screen frame is approximately plotted, the `neutral position of each cycle is indicated by the horizontal line 83. The screenplate fra-me and the screen plate 61 rise together' and vthemotion -is indicated by the curve marked 84. The screen plate, owing to its inertia and to its-being merely supported but not attached upon the spacers 63, lags at the upper part of the cycle and follows the dotted curve marked 85. positively driven by lthe eccentrics, continues to follow the circular orbit of curve '84. At the point marked 87 a jar is produced by the spacers 63 coming in contact with and abruptly overcoming the inertia of the plate 61 and forcing it to again coincide in its motion with that of the plate frame. Beyond this point induced high frequency vibrations are probably developed in the plate 61 and are indicated by the dotted irregularities 88 of line 85.

This jar appears to be of material value in the operation of the screen.

Generally speaking, the action of my de- The frame, being` vThe jarring action between the particles and` the screen plate causes the material to be periodically thrown out of contact with the plate and the agitation of the material thus facilitates its flow from right to left as well as the separation of the fines from the coarser particles.

At the right ofFig. 2 there is indicated by dot and dash lines 1000 the end of another screen similar to the one described, which may be operated in series to screen Ac'oarser sizes of material, but it is common practice to operate screens in tandem.

I :do not limit myself to the exact construction shown, but variations may be made in accordance with progress in the lart and the requirements of the particular materials to be screened, Awithout departing from the spirit ofthe invention.

I claim:

1. A screen frame,` means to move it in a i circular orbit, consisting of parallel shafts provided with eccentrics, adjustable counterbalance means at the eccentrics, a bearing for one of the eccentrics having freedom of motion longitudinally of the frame, and a screen plate mounted loosely upon the frame to cause the plate, due to its inertia, to travel in an orbit of its own, alternately lagging behind the orbit of the frame and jarring upon it when the orbits again coincide.

2. A screen frame, means to move it in a circular orbit, consisting of parallel shafts provided with eccentrics, collars mechanically fastened at the eccentrics, adjustable counterbalancemeans attached to the collars, a bearing for one of the eccentricshaving freedom of motion longitudinally of 'the frame,` and a screen plate mounted loosely upon the frame to cause the plate, due to its inertia, to travel in an orbit of its own, al-

ternately lagging behind the orbit of thev .able counterbalance means attached to the collars, a bearing for one of the eccentrics alternately lagging behind the orbit of the.

frame and jarring upon it When the orbits again coincide.

4. A screen frame, a screen plate attached to flex thereon, means to impart an orbital oscillation to said frame in a plane normal to and longitudinal to said plate, and imp-act means on said frame for said plate.

5. A device of the character described comf prising a screen frame, a screen plate of longitudinal form carried by said Screenframe, one portion of said screen plate beingsecured to said screen frame and another portion of saidscreen plate being loose relative to said screen frame soV as to enable said screen plate to flex relatively to said screen frame, means to impart an orbital oscillation to said frame, in a plane extending in the direction of the length of said'plate, and impact means carried by said frame f or receiving the impact of the loose portion of said screen plate.

'6. In a device of the character described the combination of a screen frame provided with a surface for receiving impact, a screen plate carried by said screen f rame and extending across said surface, said screen plate being made of such material as to render vsaid' lscreen plate capable of flexure, said screen plate having its end portions connected with said screen frame and having its intermediate portion free and so disposed as .to engage said surface except when said s'creen plate is flexed, and mechanism connected with said screen frame for imparting thereto an orbital oscillation in order to cause said intermediate portion of said screen plate to swing away: from said surface and to swing back against the same.

7 In a shaker Ascreen the combination of` a screen frame, means for imparting an orbital oscillation thereto, ascreen plate connected with said screen frame and controllable by said orbital oscillation thereof for the purpose of causing said screen plate to flex, and means for suddenly stopping the flexure of said screen plate.

8. In a shaker screen the combination of a screen frame, impact mechanism carried thereby, a screen plate having portions secured to said screen frame and having another portion disposed adj acentsaid impact mechanism, said screen plate having a longitudinal form and being flexible in the general direction of its length, said screen plate being so disposed relatively to said screen frame that said portion of said screen plate located adjacent said. impact mechanism can have considerable 4movement of an oscil latory character relative to said impact mechanism owing to the flexure of said screen plate, and means for imparting to said screen frame an orbital oscillation in a plane extending in the general direction of the length of said screen late.

9. In a device of the c aracter described, the combination of a screen frame, a member mounted thereon and adapted to serve as a support, a flexible plate carried by said frame and extending across said member, said flexible plate being connected with said screen frame upon opposite sides of said member, so that lwhen said plate `is flexed the proximate middle portion thereof is moved out of engagement with said member, and means for imparting to said screen frame an orbital movement suiciently violent to throw said proximate middle pori gagement with said member.

l0. In a device of the character described, the combination of a screen frame provided tion .-of the plate momentarily out of en with impact mechanism, a flexible screen ,the combination of a screenframe, a flexible screen plate having some lportions secured to said screen frame and having other portions free to swing away bodily from the general position of said screen frame to the extent permittedby the flexure of the screen plate, means for imparting to the screen frame an orbital oscillatory movement suficiently violent to cause the screen plate to flex, and stop mechanism for suddenly arresting the motion of the screen plate after each flexure thereof.

12. A revolving shaker screen having a base supporting ,parallel shafts designed to be connected together and driven in syncronism by means of a chain, eccentrics on the shafts, a screen frame supported by a rigid bearing on one of the eccentrics and a free bearing designed to prevent wrecking of the machinev Ain the event of breakage of the chain, `on the other eccentric, and a screen plate mounted upon the screen frame.

J. c. UHLiiRiK.

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