US2928544A

US2928544A - Vibrating mechanism

Info

Publication number: US2928544A
Application number: US652411A
Authority: US
Inventors: Alexander J Roubal
Original assignee: Allis Chalmers Corp
Current assignee: Allis Chalmers Corp
Priority date: 1957-04-12
Filing date: 1957-04-12
Publication date: 1960-03-15
Anticipated expiration: 1977-03-15

Description

March 15, 1960 A. J. ROUBAL 2,923,544

VIBRATING MECHANISM Filed April 12, 1957" 2,928,544 VIBRATING MECHANISM Alexander J. Roubal, Milwaukee, Wis., assignor to Allis- Chalmers Manufacturing Company, Milwaukee, Wis.

. Application April 12, 1957, Serial No. 652,411

4 Claims. (Cl. 209367) This invention relates to a vibrating screen assembly. In particular this invention relates to a screen assembly of the type having a screen box with one or more bottom screening surfaces with the screen box being mounted for vibratory movement and having vibrating mechanisms attached to the screen box for vibrating the box and its screening surfaces.

One type of vibrating mechanism often provided to impart the desired vibratory movement to a screen box is disclosed in C. S. Lincoln et al., US. Patent 2,144,382, January 17, 1939. This type of vibrating mechanism has one shaft connected to a motor for operating the mechanism and a second shaft within the unit geared to the first shaft to rotate in the opposite direction of the firstshaft. Each shaft is provided with eccentric weights mounted thereon and as the weights are rotated about their respective shafts in opposite directions a vibratory movement along a straight line path is produced and transmitted to the screen box.

It has at times been necessary to provide a screen assembly with a pair of such vibrating mechanisms in order to produce sufiicient vibratory motion to satisfy the requirements of particular installations. In such installations it was found desirable to utilize a sheave between the two mechanisms to drive the mechanisms from the center of the assembly rather than from a remote end of the operating shaft. Such a center drive was found desirable to reduce the tendency of material traveling over the screening surface to move to one side of rates Patent O 2,928,544 "Patented Mar. 15, 1960 Another object of the present invention is to provide a new and improved timing connection between a pair of vibrating assemblies being of simple construction and having flexibility to provide smooth and even distribution of vibratory forces across the entire width of a screen box to insure an even distribution of material to be screened across the entire width of the screening box as themate'rial advances through the screen box.

Another object of the present invention is to provide an improved and simplified timing connection between a pair of vibrating assemblies that will operate satisfactorily even when the rotational axis of one of the vibrating assemblies may not be perfectly connected with the axis of the other assembly.

According to a preferred embodiment of the present invention a pair of vibrating mechanisms is arranged with their operating shafts axially aligned and in a linear arrangement transverse of side walls of a screen box. Each of the operating shafts extend inwardly toward each other to approximately the center line of the screen box. A sheave is mounted on each of the adjacent ends of the two operating shafts. The adjacent ends of the operating shafts and the sheaves mounted thereon are spaced'apart from each other a distance sufficient to permit endless driving belts to be slipped between the:

ends of the shafts and the two sheaves so that they can: be fitted over both of the sheaves without dismantling: substantial portions of the assembly. To provide the;

desired timing connection between the two vibrator operating shafts the two sheaves are apertured and a timv ing pin is provided for insertion therein to provide a connection between the two sheaves and their respective the screen as often occurred when the operating shaft was driven by a sheave on a remote end of the shaft. An illustration of such an arrangement in which a sheave is mounted between two mechanisms is found in W. T. Shaler, US. Patent 2,097,347, October 26, 1937. Al-

though the center drive arrangement as shown in this Shaler patent lessened the likelihood of material shift- 7 ing over to one side of the screen this arrangement was 'not entirely satisfatcory.

For example, this arrangement was furnished with a rather complicated coupling arrangement between the two vibrating mechanisms. A disadvantage of that arrangement arises from the necessity of periodically replacing endless belts that transmit rotary power to a sheave on the operating shaft. An arrangement such as shown in this Shaler patent neces- 'sitated a considerable amount of'dismantling of the assembly in orderto get the endless belts around the operating shaft and the sheave.

An object of the present invention is to provide a vibrating screen with a'pair of vibrating assemblies with each having a separate operating shaft both driven from "approximately the center of the assembly with a removable 'timing' connection between the two operating shafts to establish and maintain predetermined timing be "tween the. vibrations..of, the two vibrating mechanisms ,wit h the timing connection being removable so that end lless drivingbelts may be easily removed and replaced without substantial dismantling of the assembly.

vibrator operating shafts. In order to provide flexibility to this connection to insure an even distribution of vibratory forces across the entire Width of the screen box and thereby maintain an even distribution of material across the screen box a flexible bushing which may be made of rubber is fitted over at least a portion of the timing pin. The pin and the flexible sleeve are arranged to provide a resilient connection between the pin and at least one of the sheaves to provide the desired flexibility in this timing connection.

Other objects and advantages of this invention will become apparent as the description of the invention pro- 7 ceeds.

In the accompanying drawings which form a part of this specification, a preferred embodiment of the present invention is illustrated wherein:

Fig. 1 is a view in elevation 'of a screen assembly according to this invention; 7

Fig. 2 is a partial end view of the assembly shown in Fig. 1 with portions of certain structure shown in cross section; and

Fig. 3 is an enlarged view of a portion of a structure shown in cross section in Fig. 2. r

The vibrating screen illustrated in thev drawing comprises a screen box 10 having a pair of vertical longitudinal side walls 11 and 12. The side walls 11 and 12 are'spaced apart and parallel to each other to support manner well known to others skilled in this art. The screen is mounted for vibratory motion and this may be done as'sho'wn where the screenbox 10 is suspended by cables 16 which are attached toan overheadisjupport 17 which may be-ipart of thebuilding in which the screen is housed. The cables 16 are here shown attached to the overhead s pport '17 ,through springs 18;" which may be either in tension or compression.

' around aperture 37.

two operatingshafts isthereby made flexible. With the described construction vibratory forcesare;

. transmitted sm sy and evenly along the entire length' "35 'andfl Withthe"pin=rernoved it then possiblelto easily slip Mounted rigidly on the scren box by means of may be operated by means of a motor 23 mounted on the overhead support -17 and which operates the vibrators r u h. arlura tno endlessbelts .24 .inija manner de- :1591??!iflfiEELdfiailhereinafter?:-fie PP 19 and r 29.,3379 1 921311 supp rt. the we h l the lvibratins mechanisms gl g zbnt also, serve to transmit the-vibrating .force to the screen, body; IQQand ,the j.jscreening' surface 13'. Thevibrating meehanisms 2 1,22;may. bothtbe of the sirppprts 19 andlfi is a pair of

vibrators

21 and 22 which,

the old endless belts ofi of the

sheaves

31,32 and withdraw .themtthrough ..the..space. between the. .two..sheaves. New endless belts can then be slipped between the sheaves and placed in position on the sheaves. When the new endless belts have been placed in position the 'pin 35 may then be reinserted in the apertures 36, 37

and the nut 43 once again turned on the threaded portion42 to draw the conical section 41 of the pin into the recess 44 and .once again provide the flexible driving connection between the

operating shafts

25, 26 to establish and maintain the proper timing relationshipibetween the vibrations produced by each of the

mechanisms

21, 22. r

From the foregoing it'will be apparent to those skilled in the art that the illustrated embodiment of the invention provides a new and improved vibratory screen and accordingly accomplishes the object of the invention. 0n

" the other hand it will also be obvious to those skilled a Pr n rmimd nt e 4 P rof. sheaves 2 the motor 23 the endless belts 2 4 and in turn transmit this rotary motion to the operating

shafts

25, 26 of the vibratingrnechanisms 21,122. Sheave 31 is mounted on o the end 27 of operating shaft and sheave 32 is mounted. I on the end 28 of operatingshaft 26. The; sheaves 31, 32 1 are providedtQrecei ve rotary motion transmitted from...

are axially spaced apart fromeach other a predetermined t di'stance flfhe two distances 'dland d are both at'.

least sufficient to permittheendless belts 24 to pass there-i between. Ih us each of the endless belts 24 can be i slipped between the two

sheaves

31,32 and then moved...

outwardlytobe placed in driving connection with the sheaves.

. m ng ans are provided to connect the two vibrat- 1

ing mechanisms

21,22 together to establish and maintain H a predetermined timing betweenthe vibrations produced t by each oflthe mechanisms. In the preferred embodi;

" inent shown in the drawings the timing means comprises.

in this art that the illustrated embodiment of the invention may be variously..adapted, changed. and modified or .featuresl thereof embodied .iniothe'r combinations-without necessarily. departing fromithe spirit of the invention or sacrificing all of.the advantages thereof. Accordingly the disclosure. herein .is illustrative only and the invention is not necessarily limitedthereto.

What. is claimed is: i I .1. A vibrating. mechanismforuse with vibrating'iscrcens and like vibratable apparatus comprising in combination:

.asupport; a pair. ofvibrato'r's mountedupon said support,

each of said vibrators having-arotatable shaft-for operating. the vibrator,said.vibrators being arranged with said rotatable shafts extending towardeach other and: axially ali'gnedin linear spaced relationshipto each other defina pin 35 fitted apertures 36,37 in the

sheaves

31, 32. w This can more clearly be seen .withireferenee to Fig. 3 which is van enlarged fragmentary portion of Fig. 2 show ing sheaves 31, 32 and the manner in which timing pin. 35 connects these twosheaves in a driving relation.

'The timing pin 35' is of generally. cylindrical shape having a head portion 38, a main body portion 39 and a portion 40 of smaller diameterthan the main body portion 39. The portions 39 and 40 are connected by what may be a conical section 41.. The pin 35 is provided with a threaded end portion 42.. A nut 43 is ing therebetween a first predetermined linear distance; a

first sheave fixedon the inwardly extending endof one. of said shafts; a second sheave fixed on.the. inwardly extending end of theother ofusaid shaftsin fixedaxially spaced relationship from said first sheave and defining .iherebetween a second predetermined lineargdistance;

driving means; endless belt means tdrivinglyflconnecting .saidsheaves tosaiddriving means for rotary movement in response thereto, said first and second predetermined distances being at least suificient, to pass saidhendless .beltmeans therebetween; and withdrawable timing means extending in bridging relationship between and. detachably connectingsaid sheaves. together to establish and maintain a preselected phase relationship. between the vibrations. of said vibrators .when actuated. in..,response to their respective. sheaves.

. 2. Ina vibrating. mechanismf, for.,-,use.withatvibrating.

. screens anddlike-apparatus, a support; a first-. :.vibrator shown mounted theroenfordrawing up on the pin 35' r to seat the conical section 41in In order to provide flexibility connection be-. tween the operating shafts. 25 and 26 aperture. 36 is bored a recess 44 provided 7 mounted upon said support; asecond vibratormounted upon said support in close centered facing spaced re-.

lationship to saidfirst vibrator, ,each of said vibrators having .a shaft. member extending outwardly therefrom,

. said shaft ofsaid first wvibrator extending toward-and into a'larger diameter than the pin portion 39and a rubber p I bushing .45 inserted intothe aperture 36. The bush-v ing 45encompasses the portion 39 of the 35 and by being interposed between'one of, thetsheaves 31 and the:

pin-35 the connection; between thetwo sheaves and the, 1

ofthe transverse supportlztlito provide an. mproved dis- ',tribution of material on t he screening surface 13 as it p passes through the b01110; Slight misalignment ofjthe vibrating mechanisms 21,:orI4their internal parts will not substantially registered spaced relationshiptwithvsaid shaft member. of,.,said,second. vibrator; first sheave means mounted upon said. shaft member of said first .vibrator and rotatable therewith; second sheave means rnounted upon saidshaft member of said second vibrator-and rotat- "able. therewith in iixed spaced relationship to said first sheave means; power means; endless beltmeansgoperative- 1y.:associated ;with' said power means andsaid sheave means for transmitting,rotary movement from said power means to the peripheriesof said sheave means to rot te sai heave m n tr sr e he tqtae liming .rneansextending 'n bridging relationshipbetween and l I itionally bother li n 'an' ees w hd a il m I er es;e pa d1i =nlles arev t means about said sheave means without dismounting either of said vibrators from said support or disturbing said fixed spaced relationship between said sheaves.

3. In a vibrating mechanism for use with vibrating screens and like apparatus, a support; a first vibrator mounted upon said support; a second vibrator mounted upon said support in close centered facing spaced relationship to said first vibrator, each of said vibrators having a shaft member extending outwardly therefrom, said shaft of said first vibrator extending toward and into substantially registered spaced relationship with said shaft member of said second vibrator; first sheave means mounted upon said shaft member of said first vibrator and rotatable therewith; second sheave means mounted upon said shaft member of said second vibrator and rotatable therewith in fixed spaced relationship to said first sheave means, each of said sheave means having corresponding apertures defined therein at equal radial distances from the central axis thereof; power means; endless belt means operatively associated with said power means and said sheave means for transmitting rotary movement from said power means to the peripheries of said sheave means to rotate said sheave means in response thereto; and timing means detachably insertable through corresponding apertures in said sheave means and extending in bridging relationship therebetween so as to connect said sheave means for positional coordination relative to each other and to said vibrators respectively associated therewith to substantially maintain a preselected phase relationship between said vibrators when rotated in response to said power means, said timing means being withdrawable from said apertures to permit the reeving of said endless belt means about said sheave means without dismounting either of said vibrators from said support or disturbing said fixed spaced relationship between saidsheave.

4. In a vibrating mechanism for use with vibrating screens and like apparatus, a support; a first vibrator mounted upon said support; a second vibrator mounted upon said support in close centered facing spaced relationship to said first vibrator, each of said vibrators having a shaft member extending outwardly therefrom, said shaft of said first vibrator extending toward and into substantially registered spaced relationship with said shaft member of said second vibrator; first sheave means mounted upon said shaft member of said first vibrator and rotatable therewith; second sheave means mounted upon said shaft member of said second vibrator and rotatable therewith in fixed spaced relationship to said first sheave means; power means; a plurality of discrete endless belts operatively associated with said power means and said sheave means for transmitting rotary movement from said power means to the peripheries of each of said sheave means to rotate said sheave means in response thereto, each of said plurality of endless belts having a transverse dimension less than said spaced relationship between said shaft members and between said sheave means so as to freely pass therebetween without requiring lateral movement of said shafts and said sheave means; and timing means extending in bridging relationship between and detachably connecting said sheave means for positionally coordinating said sheave means relative to each other and said vibrators respectively associated therewith to substantially maintain a preselected phase relationship between said vibrators when rotated in response to said power means, said timing means being withdrawable from-said sheaves to permit the reeving of each of said endless belts about said sheave means without dismounting said vibrators from said' support or disturbing said fixed spaced relationship between said sheaves.

References Cited in the file of this patent UNITED STATES PATENTS 691,908 Little Jan. 28, 1902 1,348,770 Allen Aug. 3, 1920 1,396,979 Thomas Nov. 15, 1921 1,986,325 Dallwigk Jan. 1, 1935 2,097,347 Shaler Oct. 26, 1937 2,144,382 Lincoln et al. Jan. 17, 1939 2,460,628 Fawick Feb. 1, 1949 2,844,011 Meier July 22, 1958