US2225909A - Screen - Google Patents

Description

o. c. GRUENDER SCREEN Filed June l1, 1938 7 Sheets-Sheet 1 u El ml @i .WN NN o. c. GRUENDER 2,225,909

SCREEN Filed Jun'e 11, 1958 fj. Ae.

7 Sheets-Shea?I 2 SCREEN Filed June 11, 1938 7 Sheets-Sheet 3 atto rzy/S' De@ 24, 1940- y o. c. GRUENDER y2,225,909

SCREEN Filed June. 11, 1938 '7 Sheets-Sheet 5 ffy@ Dec. 24, 1940. c. GRUENDER SCREEN Filed June 11, 1938 7 Sheets-Sheet 6 EaZ/envo? 0? 0,5665?" 6r. 'raez e?" fitto frag/5' Dec. 24, o. c. GRuENDz-:R

SCREEN Filed June 11, 1958 '7 Sheets-Sheet 7 lao Patented Dec. .24, 1940 1 SCREEN Oscar C. Gruender, Milwaukee, Wis., assigner to Nordberg Manufacturing Co., Milwaukee, Wis., a corporation of Wisconsin Application June 11, 1938, Serial No. 213,193

8 Claims.

My invention relates to improvements in screens and has for one purpose the provision of a screen which shall be simple to manufacture, compact, and .efficient in use.

Another purpose. is the provision of improved means for, providing a `screen of substantial length in which a plurality of separate units are employed.

Another purpose is the provision of an improved screen frame or deck.

Another purpose is-the provision of improved means for mounting screen cloth or mesh on a screen deck. Anotherlpurpose is thevprovision of improved means for vibrating a screen.

Another purpose is the provision of an improved multiple screen in which, in a plurality of sections arranged end toend, material from the upper level of one section may be fed to the upper level of the next, and material from the lower level of the first section may be fed to the lower level of the next. Anothr purpose is the provision of an improved screen in which a plurality of sections feed the material under the screen in opposite directions,

and preferably in such fashion as to cause the discharge from aplurality of sections to join at a unitary discharge area.

Other purposes will appear from time to time in the course of the specication and claims.

I illustrate my invention more or less diagrammatically in the accompanying drawings, wherein:

Figure 1 is a side elevation;

Figure 2 is a section on an enlarged scale along-j the line 2-2 of Figure 1;

Figure 3 is a longitudinal vertical section through the structure shown in Figure 1;

Figure 4 is a section similar to Figure 3 of the middle portion and on an enlarged scale;

, Figure 5 is a section on7 the line 5-5 of Figure 1 on an enlarged scale;

Figure 6 is a section on an enlarged scale along the line 6--6 of Figure 1;

Figure 'iis asection on an enlarged scale on the line 1--1 of Figure 1;

Figure 8 is a detail section on the line 4BB of Figure 7; f

Figure 9 is adetail section on the lines 9--9 of Figures 2 and 7; and

' Figure A10 isa side elevation of a modified form.k

a normally xed screen frame rwhich may include horizontal top frame members or channels 2, hori-l angle I1 at the discharge end of the frame I.

zontal bottom frame members or channels 3, vertical end frame members 4, 5, intermediate vertical frame members 6, inclined braces 1, and screen frame members or channels 8, and intermediate transverse members, channels or angles 9. I0, 5 II 'indicate any suitable hopper members having downspouts or discharge members I2, I3. I4 is a terminal defiector or delivery member having an upper vertical portion I5, whereby material disl charged from the lower level of the end screen 10 may be downwardly delivered. I6 indicates an additional delivery chute for the upper level of the end screen, shown as mounted on a transverse is any suitable feed spout for the feed end of the l5 frame whereby material is delivered to the upper end of the first screen section.l

Referring to Figure 1, I illustrate two screen sections generally indicated as A and B, A being the screen section adjacent the spout I8, and ini- 20 tially receiving the feed, and B being' the terminal screen section which is discharged to the members I4 and I6. It will be understood, however, that whereas I show two sections, a large number may under some circumstances be em- 25 ployed. I9 indicates any suitable motor or power source herein shown as mounted on the screen frame I itself, upon transversely extending angles 20. The motor pulley 2| through a belt 22 drives a vibrating unit on one of the screen sections, 30 'shown in Figure 1 as section B, which driving unit will later be. described.

Referringto the screen sections, and ilrst to section 4A as shown for example in Figure 2, I may employ a side plate or plates 25, of which only 35 herein shown as filling the space,between the 45` flanges of the channel 28 and extending upwardly abovel thejupper edges of said anges. Transverse frame members 30, 3| are employed extending between side plates `25 and channels 26, 2l.l

As shown in 'detail in Figure 9, taken in connec- 50 tion with Figures 2 and 7, I illustrate upstanding angles 32, 33 placed back to back on the members 30 0123 Land extending between them a longitudinal member 34,upon the top of which is mounted an upwardly open channel 35 having therein a 55` 89 indicates a lever plate, the toe of which as at 49 abuts against a small angle iron 4| secured to the upper inner face of the side plate 25. The lower toe 42. sets within the recurvedportion 38 of the screen edge. An intermediate portion 43 l is apertured to receive the bolt 44 with its outer nut 45. 4 6 is a coil spring compressed between the nui 45 or its washer 41 and the outer face of the plate 25, whereby the member 44 with its head 48 draws the member 89 inwardly and somewhat downwardly and compresses 'the edge portion 38 of the screen cloth against the upper surface of the pad 28. The result is a stretching and a very firm hold onvthe screen cloth. The lower screen assembly is the same as above described, except that the toe 40 abuts against the lower flange of the channel iron 21. It will be observed that the mesh is at all times mounted upon and resting upon pads of yielding compressible material, and is not at any point gripped between opposed metallic surfaces. 'I'he compression may be readily adjusted by rotation of the nut 45. 'I'he screen may readily be removed by slacking the nuts 45 and removing the bolts 44.

The structure of the two screens A and B is substantially the same and need not be separately described. Each section is mounted upon a plurality of compound leaf springs generally indicated at 50 in Figure 1. Each one of the spring members may be formed of a plurality of parallel leaves mounted at their upper ends in brackets 5| on the inside of the upper channels 2. Similar brackets 52 are secured to the lower ends of the spring units and to the outer faces of the side plates 25. Thus each one of the spring units A and B is floated on a plurality of leaf springs inclined somewhat from the perpendicular. In order to compensate for the weight of the screen units which tends to flex the springs into vertical position, I may provide any suitable end spring unit, as shown at the right end of Figures 1 and'S. It may include, for example, a compression member 53 shown as pivoted to the screen section B as at 54. It extends outwardly through the end of the fixed frame through an end channel 55. It has an exterior end abutment 66 and a coil spring 51 compressed between the abutment 56 and the channel 55. The compression of the spring may be adjusted as by any suitable nuts 58 on the stern 53. It will be understood that the spring compression is preferably so adjusted as to tend to keep the parts inv a neutral position, such as is shown in Figure 1.

For convenience, I will indicate the upper screen cloth of/section A as X.and the upper screen cloth of section B as X,|. `I will indicate the lower screen cloth of section A as Y and the lower screen. cloth of 4section B as Y4-I. As shown in Figure 3, the parts are so proportioned that the discharge end of X overlies the feed end of X|, and the discharge end of Y overlies the feed end of .Y--Ll 'I'hus the oversize passing over X and Y is fed directly to X-I and Y-I respectively.

It will be understood that the channels 28 and the rubber pads 29 of unit A extend outwardly beyond the end /of the side plate 25, as shown in Figure 3. similarly, the corresponding units 28 and 29 of section B extend outwardly beyond the feed end of the side plate 25 of that section. Also, the members 39 may be correspondingly extended and those for the section B may be cut away to prevent interference with the extending lends of section A. As shown in Figures 3 and 4, where the vibrating units which are later described are interposed, they include channeled portions 28a in which the pad 28 outwardly extends. v

Referring'to the vibrating unit, which in the form of Figure 1 is shown mounted on screen section B, its details will be shown for example in Figures 4, 5 and 6. I illustrate for example reinforcing plates 60 which may be welded or otherwise secured to the side plates 25, and which have reinforcing extensions 6|. Mounted in an aperture in the reinforcing plates 60 is a bearing housing which includes a member 62 having a flange 62a and a generally cylindrical wall member 63 having a flange 63a. Bolts 63h and nuts 63o secure the flanges 62a and 63a to the side plate 25 and the reinforcing plate 60. Secured to the member 63 by means of the bolts 64a is an inner member 64 having a generally cylindrical flange 65 in which is mounted a cylindrical housing and strut member 66. 61 is an outer ballor roller race and 68 an inner race, 69 indicating the rollers.

V including a labyrinth connection generally indicated as 14 with the member 62, whereby the escape of-oil and the entry of dust is prevented. 15 is an eccentric shaft extension from the shaft 10 to the end of which is secured any suitable pulley 16 about which passes the belt 22 whereby the eccentric structure may be rotated from the motor |-9. 11 is an inner roller race mounted on the shaft 15 and. surrounded by an outer race 18 with rollers 19 therebetween. Surrounding and associated with the outer racev is a knuckle joint of a connecting rod 8| which extends to the opposite screen. The knuckle has labyrinth con nections 83 with the pulley 16, and 84 with the member 13, whereby the roller bearings are pro- 'tected'.

' At the opposite end of the connecting rod 8| is a split hub 85 which may be compressed as by the bolt 86 and nut 81. It surrounds a connecting structure mounted on the screen unit A which includes an outer sleeve 88, an inner sleeve 89, and an interposed sleeve of rubber or the like which may be vulcanized to the members 88 and 89, whereby the interior deformation of the compressible and yielding member 98 lcompensates for the slight oscillatory rotation of the member 85 and prevents any metal to metal bearing contact. Positioned within the inner sleeve 89 is a trunnion 9| which may be formed unitarily with a casting 92 having a positioning stud 93 extending inwardly through the side plate 25 and the reinforcing member 68. It may further be held in position as by any suitable bolts 94 and nuts 95. The same nuts and bolts may extendl through the outer flange 96 of an inner plate 91, having a cylindrical iiange 98 in which is positioned a tubular strut 99. The member 91 has an aperture as at |00 which also receives the inner end of the member 93. Thus a firm vibrating contact is provided for the screen unit.

The trunnion 9| has a-reduced threaded end 9 la to receive a washer 9 b and a nut 9|c to secure the sleeve 89 in position. lIn order to counterbalance. the difference inweightof thevibrating l n A position. Th'e screen, however, "actsas'a:

razas-,999

unit on screen unit Band the. co'nr1 'e' :tin'g struc- .,ture onscreen unit A,I may'provi'dewei'ghts lon `either or :bothscreen units, .as `at `.'I`I 0. onf'unit A and III onunitB as showninFigurle 1.. 'Q

1 Where thetubular members or struts 66 or`. 98

extend*A across the screen sections, it.. [willbe understood that any suitable means may be emf ployed, such as. the welded plates IOI for carrying the members. thereacross. Since the'strut unit is removable, I find it preferabletoA provide a removable connection between the members34 and the-plates IBI, which may include thebolts.

|02 and nuts I 03.` 'I he lever plates y39 are cut down as at 39a. to pass underthe members 63 and 91. y

It will be realized that my description and drawings are in a broad sense illustrative and diagrammatic and that many changes in size, shape, number and disposition. of parts may be made. I therefore do not wish to be limited specifically to the devices herein shown except to the extent that I may possibly limit myself in the claims. For example, I illustrate in Figure 10 a variant form of the device in which the constructive details may be the same, and will therefore not be redescribed. In the form of Figure l0, however, the screen sections A and B are mounted with the springs 50 of the two sections oppositely inclined. The motor I9, therefore, when through the belt 22 it rotates the pulley 16, imparts through the connecting rod 8| a simultaneous vibration to the sections A and B, which is in reverse direction. In the form as shown, the two screens will feed in opposition to each other, and I may therefore provide an additional feed spout I8a. for the section B, and two unitary discharge chutes |20 for the upper levels of the two` screens and I2I for the lower levels, to carry oi the oversize which is discharged at opposite sides of the screen structure.

This type of screen lends itself to a compact installation in which there is a minimum of lateral length permitted. For instance, I may4 employ a single main feed spout or ,conveyor I'22, which by branch chutes I23 and |24 maydeliver material to be screened to the feed chutes or spouts I8 and I8a. A minimum of longitudinal Voutward extension of the screen structure is needed and all of the screen material. can escape from the screen unit intermediate its'length, either through the spouts I20I2I or through the spouts I2, I3.

The use and operation of my invention are as follows: I

In the form of Figures l and following, material is fed to the top of the screen surface X, as shown in Figure 3, by means of the spout: I8. The undersize will passthrough X and drop on the surface Y. The fines which can pass through Y will drop through to the hopper III and escape along the chute or spout'I2.Theoverszelfrom X'will 4pass .to X-l, the vundersize of X--I will drop on the screen surface AY-I, and the oversize from Y will also` be deliveredto Yfl The undersize from Y--I will passdownwardly through to the 4hopper I I and escapethrough'the ychute or spout I3. `The oversize from thesurface X-I will pass outwardly overthe spout extension |30 to'vthe feed chute -I6,., .The oversizefromfthe screen surface Y--I ,willebeffed downwardly Aby the chute IL the vupward .extension I5 serving to Y prevent any: unintended longitudinaleseape.' of the screen ,sections to ilexthesprings fill vtovertical "tin that although relatively short individual sectnns 'are employed, .thematerial 'is' fed t'initarily from end im enc gaf; the) vscreen) and t' r 'opti-rin; the 't ai- 5 vatagesof ,la long screen with,- great keconomy of Qconstruction and operation. Tl'iejsingle vibratory nunit of one 'screen section is'fperfectlyadeql'lte .tto ,vibrate bot-h sections and the'jfvibrating. ltransmittinlg mechanism 'I have'shfown, including the )10 connecting rod 8l', efciently' applies vraQsubstan- |tially luniform vibrationntogthe twojscreen'fsecn tions. There is, of course, a'certain lagy of'fvibr'ation or a reduction in vibration resulting from the y transmission, and the operator 'can vtherefore elect 15 which section he wishes to apply his vibrating unit to. The parts are so proportioned that vvthe operator may remove the vibrating unit from one screen vsection and put it on the other, thus reversing the driving connection as shown in Figure ,20 1. The most violent vibration would be imparted to the screen upon which 'the vibrating unit is mounted, and the rubber vpadding 90, to some slight extent, cushions the vibration of the other section. Therefore, the operator puts his vibrat- 25 ing unit on that section where he wishes his most violent vibrating action.

' The unbalanced member is enclosed and shielded by the transverse tubular strut 66. It will be observed that the center of rotationa of 39 the shaft 10, II in relation to the'screen section is eccentric in relation to the center of rotation b of the pulley 16. 'I'he axis c of the eccentric shaft extension 15 and ofthe connecting rod connection 80, however, is eccentric to both. In prac- 35 tice, the rotation of the unit thus described results in a vibration having a throw substantially twice the distance separating the center of rotation a of theshaft 10 in relation to the screen section, and the center of r'otation c of the eccentric 40 shaft extension 15.

'I'he weights H0, III, which are removably secured to the screen members, may be employed to change the actual or relative amplitude of vibration of the screens by changing the actual or 45 I relative weight of the two screens. Whereas I have illustrated in Figure l a Single weight IIIJ secured to one of the screen units, it will be understood that I may vary the size of the. weight or provide ,a multiplicity of weights. These weights 50 are effective either to balance the screens to provide a uniform amplitude of vibration, or intentionally to vary'the vibration in -such fashion as to provide a dierential between the two screens.

I claim: n

1. In a vibrating sc reen structure a base, a plurality of screen elements-and means forsupporting them vibratably upon said base, vsaid lscreenV elements being locatedend to end, and

means for simultaneously vibrating said screen 00 elements including a shaft yinou ntedjon one'of said elements and extendinfgitransver'selyjthereacross in a generally horizontal pla mansffor mounting said shaft rotjatallly` upon d creen screen element, said. shaftf' and' s lid. connection J. between the 1lnk` and other' screen lnentfbing v715 located upon adjacent ends of the two screen elements.

2. In a vibrating screen structure a base, a plurality of screen elements and means for supporting them vibratably upon said base, said screen elements being located end to end, and means for simultaneously vibrating said screen elements including a shaft mounted on one of said elements and extending transversely thereacross in a generally horizontal plane, means for mounting said shaft rotatably upon said screen element, including bearing means eccentric to the shaft, means for rotating the shaft4 including a pulley mounted on the shaft, the axis of the pulley being eccentric to the shaft and. to the bearing connections between the shaft and the screen element yand being located substantially midway between them, and a link including an eye surrounding an outwardly extending portion of the shaft. and a connection between said link and the other screen element, said shaft.and said connection between the link and other screen element being located upon adjacent ends of the two screen elements, said connection between the link and the other screen element including a stub shaft on the other screen element, an eye on the link surrounding said stub shaft and a rubber bushing interposed therebetween.

3. In a vibrating screen, a base, a plurality of generally horizontal screen elements located end to end on said base and in the same general plane, means for supporting them vibratably upon said base, and means for simultaneously vibrating said screen elements including a shaft rotatably mounted upon the end of one of said screen elements closest to the other of said screen elements, means for rotating the shaft and a connection between said shaft and the other screen element including a link having an eye surrounding an outwardly extending eccentric portion of said shaft and a connection between the other end of said link and the end of the opposite screen element adjacent the end of the screen element on which the shaft is mounted, the center of the shaft and the center of the connection between the link and the opposite screen element being located substantially midway between top vand bottom of the two screen elements.

4. In a vibrating screen, a base, a` plurality of generally horizontal screen elements located end to end on said base and in the same general plane, means for supporting them vibratably upon said base, and means for simultaneously vibrating said screen elements including a shaft rotatably mounted upon the end of one of said screen elemeans for rotating the shaft and a connection between said shaft and the other screen element including a link having an eye surrounding an outwardly extending eccentric portion of said shaft and a connection between the other end of said link andthe end of the opposite screen element adjacent the end of the screen element on which the shaft is mounted, the center of the shaft and the center of the connection between the link and the opposite screen element being located substantially midway between top and bottom of the two screen elements, one of said links being located at each side of the screen.

5. In a vibrating' screen structure. a base, a pair of screen elements located end to end on said base, means for vibratably supporting them upon said base, means for vibrating them simultaneously including a shaft mounted .on the Aend of opposite ends of said links and the adjacent end' of the other screen element including plates secured'to the sides of said screen element, stub shafts outwardly extending from said plates, and a reinforcement extending between the sides of said other screen eleme it, said reinforcement being generally aligned with said stub shaft.

6. In a vibrating screen structure, a base, a pair of'screen elements located end to end on said base, means for vibratably supporting them upon said base, means for vibrating them simultaneously including a shaft mounted on the end of one of said screen elements closest to the other screen element, and means for rotating it, links surrounding outwardly extending portions of the ends of said shaft and connections between the opposite ends of said links and the adjacent end of the other screen element including plates secured to the sides of said screen element, stub shafts outwardly extending from said plates, and a reinforcement extending between the sides of said other screen element, said reinforcement being generally aligned with said stub shaft, said reinforcement including a structural element extending between the sides of said screen element, flanged inner plates secured to the inner sides of said screen element in alignment with said first mentioned plates, said anged plates being socketed to receive the ends of said tubular reinforcement.

7. In a vibrating screen structure, a base, a pair of screen elements located end to end on said base, means for vibratably supporting them upon said base, means for vibrating them simultaneously including a shaft mounted on the end of one of said screen elements closest to the other screen element, and means for rotating it, links surrounding outwardly extending portions of the ends of said shaft and connections between the opposite ends of said links and the adjacent end of the other screen element including plates secured to the sides of said screen element, stub shafts outwardly extending from said plates, and a reinforcement extending between the sides of said other screen element, said reinforcement being generally aligned with said stub shaft, and

positioning members extending inwardly from said plates through the sides of said other screen element.

8. In a vibrating screen structure, a base, a pair of generally horizontal screen elements located end to end on said base and in the same general plane, means. for vibratably supporting them upon said base,l means for vibratinglthem simultaneously including a shaft mounted on the end of one of said screen elements closest to the other screen element, and means for rotating it, links mounted at each side of the screen frame member, and having eyes surrounding outwardly extending eccentric portions of the ends of said shaft, and connections between .the opposite ends of said links and the adjacent end of the other screen element, the centers of said shaft and of the connection between said links and the opposite screenielement lying substantially midway between top and bottom of the two screen elements, and individually variable weight means mounted upon each of said screen elements intermediate top and bottom thereof.

OSCAR C. GRUENDER.

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