US2808936A - Continuous centrifugal extractor - Google Patents

Description

Oct. 8, 1957 s. A.' HAGERUP commons CENTRIFUGAL EXTRAGTQR Filed June 7, 1956 Ku ll United States Pat":

2,808,936 CONTINUOUS CENTRH UGAL EXTRACTOR Svend Asmussen Hagerup, Copenhagen, Denmark Application June 7, 1955, Serial No. 513,718

' 7 Claims. (Cl. 210-374) separator drum is provided with guiding members by.

means of which the said material may be conveyed in a uniform flow through the compartment towards the ejection apertures, without risk of clotting, or of the material being retained in the compartment. i

In the straining separator described in said patentith e.

guidingmembers comprise either upright inwardly projecting stationary guiding ribs or continuously rotating cylinders or rollers at the inner edges of the. ribs. It has, however, been noted, that, when separating material containing long fibres there .is a tendency ofpthe material to clot in the separator chamber because such long-fibered material tends to wrap around the continuously rotating rollers.

The object of theiinvention is toprovide a straining separator of the type described in which the clotting of the material containing long fibers may be eliminated by oscillating the upright rollers. V: V V

A further objectof'the invention is to provide a strainingseparator of the type described, in which the guiding members or rollers are actuated in such amanner that materials of all kinds will be assisted in their movement toward the apertured area .of the drum so as to obtain a uniform flow without clotting. V k

A still. further object of' thc invention is to provide a straining separator of relatively simple construction for imparting to the guiding rollers'an oscillating motionj These and other objects and advantages of the invention will beapparent from the following description ofa discharge pipe 7. Close to the outer periphery of -the straining separator, taken in conjunction with the accompanying drawing, in which:

Fig. 1 is a sectional view of the straining separatcr on the axis of rotation, V a a Fig, 2 is a plan elevation of same,

Fig. 3 is a cross sectio-n on line III III in Fig. 1, and

Fig.4 is a modified detail of the means for oscillating the guiding rollers. V

The separator consists of a drum 1 shaped as a truna cated cone the outer wall of which is perforated with holes 2, or is otherwise constructed as astrainer. The drum is attached to a spindle 3. which may be rotated by a driving mechanism not shown in the drawing. The

material tobe separated is fed into the separator chamber rations 2, or the strainer, is collected in 'a container 6] arranged around the separator drum and provided with a The separated liquid separator chamber at the base of the drum there are provided ejection apertures 8 through which the separated solid matter is removed. These ejection apertures are indicated in Fig. 3 by means of dot-and-dash'lines." The separated solid matter is collected in a container 9 ar-, ranged around the separator drum. Opposite each ejection aperture 8 is arranged a rotary roller 10 which as, in said patent, both retards the discharge of solid material and conveys some of it away from the drum. Rollers 10.

Meshing with gear 11 are complementary screw wheels 12 on shafts 13 carrying worm gears 14 meshing with worm wheels 15 on certain of, therollers 10. Any number of shafts 13 andassociated gears may be employed,

andpreferably there is employed such a number that they may be arranged symmetrically around the spindle.3 in order to well balance the separator drum 1. When a greater number of ejection apertures 8 with rollers 10 is used than the numberof the shafts 13 and associated gears, it is necessary to couple the rollers liltogeth'er'by means of bevel gears 16 or other suitable coupling members, e. g. friction couplings. 7

Within the separator chamber 4Vis arr'aiigedan annular series of upright guide members in the form of oscillating cylinders or rollers 17, eachprovided with a shaft 18 projecting through the base of the separator .drum and journalled in depending bearings 19. As in Figs. 3 and 4 of Patent 2,578,468 the upright rollers, are disposed, at

the inner ends of ribs or webs which extend inwardly from the inclined walljof the drum 1 and form a plurality of compartments which together with the central space beneath the drum inlet 5 and surroundedfby the rollers 17 constitute the separator chamber 4.' Any number of these radially extending compartments 60 may 1 be provided but as shown in Fig. 2 there are six. One of the apertures 8 is located at the outer portion ofthe bottom of each compartment and the outer wall 'of'each of the compartments has the perforations 2. The shafts 18 carry radial arms 20 bymeans of which the'rollers 117 may be rotated or turned first in one direction and then in the other, through driving members attached to power transmitting members on the drum spindle 3. The rollers may be actuated singly, or in groups as seen in Fig. 3,.

eccentric mechanisms or crank devices. As shown," each crank device comprises a crank arm or pin 24 movable with the gear 22 and pivoted at one endof a'conne'cting rod 25, the other end of which latter is pivotally attached to a radial arm 2% on'the shaft of one of the rollers 17;

Links 26 are pivotally connected to adjacent arms 20 of each group, and since thearms 2ttare longer than the length of stroke of the crankpins or arms 24, all of the rollers 17 will be oscillated during the operation of the separator.

In the operation of separators of this characten'gthe material moves 'in'a uniform flow'through the separating chamber to the ejection aperturesS and in doing so it'f must pass along the inner edges ofth'e'ribs orwebs which form the compartments between them. When the ,ma- I, terial contains fibrous matter, there is a tendency for the fibers to'adhere to said edges because of centrifugal force. To' overcome this drawback, it was proposed in said patent to-mounton said-edges cylinders-or rollers- Patented Oct. 8, 1957.

which are continuously rotated in the same direction. However, it'was found in the operation of such'a structure, that when the material contained long fibers, the latterwouldcwrap around the. cylinders because .oithein continuous rotationin the same direction... After. .muchl experimenting withlthat Fleischer separatonjl discovered that by giving the cylinders orrollers .a'npssflillating. mo.- tion, the long fibers in the materialwillnbt wraparound,- the cylinders, and onaccount of the. force ofrg'ravityathe. material will'be conveyed or caused to fiowwithout, clot; tingor. other difficulty from the topof the separating chamber to.the apertures 8f The oscillation of'therollers or cylinders 17 not-only prevents longfibers fromwrap; ping around them and 'forming cl.ots, but they agitate the materialthat comes incontact withthem and tend to guide-or feed suchmaterialin'to oneor the other of adjoining compartments. and toward the. apertured portions offthe drum. It is to'be noted that allJof the ,ma-. terialcntering. the inlet. Smust pass between adjacent rollers 17f and that their oscillatory movement tends to breakit up as itmoves downwardly and outwardly by gravity and by centrifugal force.

As will be understood on reference to Fig.4, instead of using thearms 20, the extensions of shafts 18, of rollers 17 may be provided with gear wheels27 which. mesh with a toothedsegment 28 arranged for oscillatory motion on a. pivot 29 depending from the base of. the separator drum. The segment is atone end of a swinging. arm 30, the other end of which is mounted on. pivot 29. The connecting rod 25 ispivotally attached tolthe part 30 between the toothed portion and thepivot 29.. Instead of link members 26 the rollers may be coupled together by means of gear wheels.

'What is claimed is':

' 1. In a continuously operating straining separator for handling material containing long fibers, the combination of aperforated separator drumhaving an upper inletand; a base with'a plurality of ejection apertures for removal of separated solids fromthe drum, means mounting the. drum for, rotation including a drum,shaft, rotary retarding and conveying members associated with'said ejection apertures, means for rotating .said members, anlannular series of upright guidingrollers within. the drum. and between whichjthe material entering said inlet mustpass to ,reach, the perforated areas, each of saidrollers, being, carried'by a rotatably mounted vertical shaft, and, means foroscillatmg the shaftsof said .rollers.

2. vAstructure asclaimed in. claiml il1.Whih.S3id last mentioned means. includes an eccentric mechanism driven A 4.- A structurev as, claime'din .claim 1,. in rwhichrthe means for oscillating the shafts of the guiding rollerscomprise for eachroller a shaft extension projecting below the drum base, at least one arm projecting from said shaft extension, connection rods interconnecting saidjarms, a

gear wheel rigidly attached to at least one .of' the said shaft extensions,. a toothed. segment, rotatably mounted on a pivot attached tothe drum. base and in .mesh with said gear wheel, a 'disc' connected to the driving means of; themetarding and conveying, members. for. rotation thereby,v and. a,cortnectin'gv rod .eccentrically attached .to

the, said. disc andHto'ftheItQoIhed, segment between its oothed.v Portion anditsipivot.

'5.... In..a continuouslyIoperating strainingseparator for handling, material containinglonghbers, .the ,combination.

eta-perforated. separator drum having an upper. inlet and.

' a base wi haplurality. otejection: .aperturcs-.- for removal Y 4 I drum for rotation including a drum shaft, rotary retarding and conveying members associated with said ejection apertures, means forrotating said members, said drum having an annular series of upright webs extending inwardly from its perforated straining wall to form between them an annular series of radially extending compartments which together with the central space beneath said inlet constitute the separating chamber of the drum, an annular serieszof upright guiding-rollersbetween which the material entering said inlet must pass to reach the perforated areas, said 'rollersextendingfrom the top to the base of .the drum andone ofv them beingdisposed along the inner edge of each of said webs, a vertical shaft for each roller rotatably. mounted.and .-l1aving an extension projecting below the drum base, said means for rotating said members including at least one rotary shaft driven from the drum shaft, a pair of meshing screw gears, one being mounted on.said last mentioned rotary shaft and the otherqrnountedon a vertical .pivot depend-., ing from the drum base,.a. crank arm movable. with the. screw gear on said vertical pivot and rotatable with thatgear, means. actuated by said. crankarm-to voscillate'..,at least one of said shaft. extensions, and means for impart.- a ing the oscillatory movement ofthe last mentioned. shaftj extension to certainother of the shaft extensions.

6. Ina continuously operating .strainingseparator. for. handling material containing long .fibers, .the combination.

ofa perforated separator drum having. an upper inlet and j a basewithaplurality of ejection apertures for removal. of separated solidsfrom the drum, means. mounting the drum for. rotation including a drumshaft, rotary retarding and-conveying members associated with saidejection.

apertures, means for rotating said members,. said drum 1 having-an annular series of. uprightwebs extending in-.[

wardly; from its perforated straining wall to form between them an annular. series of radially extending com: partments which togetherwiththe central space beneath said inlet constitute the separating chamber of. the: drum, an annular series of upright guiding rollers between which the material .enteringsaid inlet. must pass. to reachuthe perforated-areas, saidrollers. eirtending from-thejtop to.

the base .of the, drumand oneoftbcmbeing .disposed.

along the inner edge of each ofsaid'webs, a verticalshaft. for each roller rotatably mounted and :having'an extension projecting below.-the drum base, radial, armsprojecting 1 from saidshaft extensions,, said,means for rotating said members. includingat least one rotary shaft driven front. .the drum shaft,.a pairof meshing screw gears, one being.

mounted on said last mentioned rotary shaftand theother mounted on. a vertical pivot depending from the drum base, a .crank arm shorter than-saidfirst mentioned, arms. movable withthe screw 'gear on saidyertical pivot, a. con-.1

necting rod pivotedltovsaid crank arm .andto the. armon one of said; shaft extensions, whereby the. latter will be, oscillated when saidacrank .arm is rotated, and meansto impart the oscillatory movement of the last mentioned.

shaft extensionto other of the shaft extensions, the .last

, mentioned means including links connected. between .cer-s tain of said radial arms. v

'7. In a continuously operating .strainingseparatonfor handling material containingv long. fibers, thefcombination an annular series of upright webs extending inwardly.

from its perforated straining walltoform, between. .them an annular series of radially extending compartments... whichtogether with the central ,space'beneath .saidinlet constitute the separating chamberof the drum, an annular. series of upright. guiding. -rollers-between which the; material entering saiddnleamust pass?totreach.thetperforatedw. 0fcseparated. so1ids from; th tdrum, nieanswmountingythe: :7 areassaid; rollers extending tram: the top gtotthe; base: of.

the drum and one of them being disposed along the inner edge of each of said webs, a vertical shaft for each roller rotatably mounted and having an extension projecting below the drum base, said means for rotating said members including at least one rotary shaft driven from the drum shaft, a pair of meshing screw gears, one being mounted on said last mentioned rotary shaft and the other mounted on a vertical pivot depending from the drum base, a crank arm movable with the screw gear on said vertical pivot and rotatable with that gear, a toothed gear on at least one of said shaft extensions, at least one horizontally swinging arm having one end pivotally supported from the drum base and its other end provided with a 6 gear segment in mesh with said toothed gear, a connect ing rod pivoted at one end to said crank arm and at its other end to an intermediate portion of said swinging arm, whereby said one shaft extension will be oscillated when said crank arm is rotated, and means for imparting the oscillatory movement of said one shaft extension to certain other of the shaft extensions.

References Cited in the file of this patent UNITED STATES PATENTS 2,578,468 Fleischer Dec. 11, 1951

Images