US1817594A - Machine for separating liquids from solid bodies mixed or suspended therein - Google Patents

Description

Aug. 4, 1931. R. E. WAGNER ET AL MACHINE FOR SEPAIRATING LIQUIDS FROM SOLID BODIES MIXED OR SUSPENDED THEREIN Filed June 6, 1930 5 1 w 0o l 11 /.,-M VQ a 15K e ww A m 5 4 5 w 1 five/Mons:

fiz/afoffrns/ Wgyn er Jo/Ion Don//U/gren v I RUDOLF nnus'r Patented Aug. 4, 1931 J1 UNITED STAT S; PAT N OFFICE WAGNER, KARLSTAD, AND JOHAN DANIELULLGR-ENQOF STOCKSUND, SWEDEN, ASSIGNORS TO AKTIEBOLAGET KARLSTADS MEKANISKA WER-KSTAD, OF

KARLSTAD, SWEDEN, COMPANY OF"SWEDEN MACHINE non. SEPARATING LIQUIDS FROM soLIp BODIES MIXED onsusrnnnnn I i THEREIN" Application filed June 6, 1930, Serial No.

facture for collecting and shaping a layer or web'of'material out of the pulpiwhich is ditreated.

aprons move away pressing point proper luted with water to a more or'les's thin consistency, said web of material being afterwards conducted to the drying machine to be further The machine is provided in amennerpreviously known with two endless wire aprons each ofwhich runs through and forms a wall of a pulp container,' and each of which is supported by a rotatablyijournalled, perforated roller the interior of which communicates with a suctionjbox, in such manner that the webs of material collected on the wire aprons during their passage through the pulp containers become pressed together to form one web at a point at which the'two wire aprons are pressed against the intermediate materialby the rollers which are'jour nalled parallel to each other. Tests performed with double collecting machines of this type have proved that it'isvery diflicult to press together the two webs to a single web in a satisfactory manner. These difficulties appear to be mainly due to the fact thatthe material becomes strongly compressedfat the between 'thetwo roll; ers, after which it. again swells owing to its inherent elasticity, which results in the'wire aprons being subjected to much wear'by friction against those packing plates which must be provided at the points where the wire from. the. perforated rollers- '1' The present invention'has for its purpose to eliminate these difiiculties, and it consists broadly in. that the machine is two packing plates or the like, each of which bears with one edge which is preferably obliquely chamfered, against one of the perforated rollers immediately beyond thesaid pressing point taken 1n the direction of rotation' of the roller, ably attached to the suction'boxes, pulp con} tainers,

provided with i said plates being adjustor other stationary parts of the'maa chine frame in such manneras to be capable 459,555, and in SwedenMarch 30,1929.

of adjustment at'various distances from each other; This arrangement'renders it possible inea'ch particular case to adjust the plates to suit the nature and condition of the pulp, at such distance from one another as'to avoid squeezing of the compressed-web of material between the plates and consequent rapid deterioration of the wire aprons due to heayy'wear,'and on the other hand, so as to avold play between theplates and'the wire aprons and air leakage resulting therefrom;

The accompanying drawing shows by way of example a pulp collecting machine according to the invention viewed partly in side elevation and partly in vertical section,

Referring to the drawing, 1 and 2 denote two pulp containers to which the pulp which is diluted with'water, is conducted through the supply pipes 3 and 4,.respectively. Rotatably'journalled between the pulp containers are two perforated rollers 5 and 6 in such manner 'that,,their axes are parallel to each other, 7 siderable space 'betwee'n the shells of the rollers. i

Running over said rollers are endless wire aprons 7, and 8, respectively, which also run and so that there is only an incona over suitable guide rolls 9 and 10, respective- I ,i

ly, and stretch rolls 11 and 12, respective ly, which are journall-ed in the machine frame, which is'not shown in the drawing.

Attached to the lower side of each roller which is not covered by the wire apron"? or '8, respectively,'is a suction box 13 and 1 1-,

respectively. These suction boxes communicate through pipes 15 and 16 W1th a vacuum pump, not illustrated in the drawing by means of whioha suitable vacuun'rcan be malntained 1n thesuct-i'on boxes and thus also parts of the wire a'pronsTand 8 will thus runjupwards through the pulp containers, so that each of said parts formstheinner wall .of the associate pulp container, While the wire aprons run upwards'through the pulp containers the pulp in thesaid containers Wlll gradually deposit on the wire aprons ll tl boxes 12-) and 14 contributes to effect the deposit of the pulp, rapidly removing the water passing through the Wire aprons and conducting it through the perforations of the roller shells to the suction boxes, from which the water is afterwards conducted away in any suitable manner;

In this manner pulp webs 19 and 20 are formed on the wire aprons, which webs when raised by the rollers above the level of the liquid in the pulp containers, are still subjected to suction and are therefore further freed from water, whereupon at the pressing place 21 wiere the two wire aprons are pressed by the rollers against the pulp between said aprons, the webs are compressed to a single web 22 which is finally conducted away in the direction denoted by the arrow 23.

In order to produce the required tight packing at those points immediately beyond the pressing place 21 where the wire aprons 7 and 8 again move away from the rollers and 6, two packing plates 24 and 25 are secured to the inner walls of the suction boxes 13 and 14, each of said plates having an upper obliquely chambered edge bearing against the associate roller shell. The inner parts of the wire aprons 7 and 8 and the compressed web of material 22 must thus pass between these packing plates. It has been found that it is of particular importance in practice, in order to obtain a satisfactory compression of the two webs of material 19 and to one web,

thatthe distance between said packing plates "3 is correct. This is due to the fact that the pulp is quite strongly compressed at the pressing place 21, and swells afterwards owing to its inherent elasticity. Therefore, if the'distance between the plates 24 and is too small, the compressed web of material 22 will be squeezed between said plates, which results in much wear on the wire aprons which will quickly deteriorate.

Again, if the distance between the plates is too great, there will be play between the.

plates and the wire aprons and resultant air leakage. For rendering possible a correct adjustment of the packing plates 24 and 25 in each particular case said plates are secured in such manner that they may be adjusted at various distances from one another to suit the nature of the pulp treated In the embodiment illustrated, such adjustment is ren dered possible by the packing plates 24 and 25 being detachably secured to the walls of the suction boxes by means of screws 26 and 27, respectively, which pass through slots 28 and 29, respectively, in the plates and are screw-threaded in'the walls of the suction boxes, and by thin intermediate layers and 31, respectively, being placed between the plates and said walls. In practice said layers may simply consist of asuitable number of paper sheets. By increasing or decreasing the number of these intermediate sheets it is thus possible in each particular case to adjust the packing plates at the correct distance from one another. The screws 26 and 27 passing through Vertical slots 28 and 29 in the two packing plates provides the possibility of adjusting the packing plates in the vertical direction, that is to say, approximately in the tangential direction relatively to the rollers 5 and 6, so that in this manner a correct hearing may in each particular case be obtainedbetween the upper chamfered edges of the packing plates and the roller shells.

.Finally, as illustrated in the drawing, the left-hand packing plate 2 1 is adjusted slightly higher than the right-hand plate, so that the oblique edge of the left-hand plate bears against the associate roller 5 somewhat closer to the pressing place 21 than the upper edge of the right-hand packing plate 25. This arrangement provides thatthe suction exerted through the roller 5 on the compressed web of material 22 ceases a short moment earlier than the suction from the roller 6, so that the web of material 22 is securely loosened from the wire apron 7 and follows the wireiapron 8 down to the guide roll 10 where it is separated from said wire apron 8. In thismanner it is ensured that the compressed web of material is not again ripped in two. v

Flush pipes 32 and 33 are provided in a manner previously known in the. interior of the rollers 5 and 6 through which pipes wator supplied through the pipes 34 and 35, respectively, is thrown against the roller shells in order :to keep the perforations in the same clean. I

The construction above described and illustrated in the drawing is only to be regarded as an example, and it will be understood that itis capable of modification in various ways without departing from the principle of the invention.

We claim:

1. In a machine for separating liquids from solid bodies mixed or suspended therein, the combination of two pulp containers,

two rotatablyjournalled perforated rollers, each. such roller being associated with one of said pulp containers, a suction boX for each of said rollers, two endless wire aprons, each of said aprons running over one of said rollers and forming a wall of one of said pulp containers, said rollers beingadapted to press the webs of material collected on said wire aprons while passing through said pulp containers against each other, and two packing plates, each packing plate having an edge bearing against the associate roller imsuch roller being associated with one of saidpulp containers, a suction box for each of said rollers, two endless wire'aprons, each of said aprons running over one of said rollers and forming a wall of one of said pulp containers,

of adjustment in a direction direction of rotation of said rollers, said packing plates being adjustable atvarious distances from one another and being capable substantially tangential to said rollers, and one of said packing plates having lts edge bearing against the associate roller at a shorter distance from said pressing place than the edge of the other packing plate bearing against the other roller. V

RUDOLF ERNST WAGNER.

J OHAN DANIEL ULLGREN.

said rollers being adapted to press the webs of material collected on said wire aprons while passing through said pulp containers against each other, and two packing plates, each packing plate having an edge bearing against the associate roller immediately beyond such pressing place taken in the direction of rotation of said rollers, saidpacking plates being adjustable at various distances from one another and being capable of adjustment in a direction substantially tangential to said rollers.

3. In a machine for separating liquids from solid bodies mixed or suspended therein, the combination of two pulp containers, two rotatably journalled perforated rollers, each such roller being associated with' one of said pulp containers, a suction box for each of sald rollers, two endless wire aprons, each of saldaprons running over one of said rollers and forming a wall of one of said pulp containers, said rollers being adapted to press the webs of material collectedon said wire aprons while passing through said pulp containers against each other, and two packing plates, plate having an edge bearing against the associate roller immediately beyond such pressing place taken in the direction of rotation of said rollers, said packing plates being adjustable at various distances from one another, and one of said packing plates having its edge roller at a shorter distance from said pressing place than the edge of theother packing plate bearing against the other roller.

4. In a machine for separating liquids from solid bodies mixed or suspended therein, the combination of two pulp containers,

bearing against the associate each packing two rotatably journalled perforated rollers, Y

each such roller being associated with one of said pulp containers, a suction box for each of said rollers, two endless wire aprons, each of said aprons running over oneof said rollers and forming a wall of one of said pulp containers, said rollers being adapted to press the webs of material collected on said wire aprons while passing through said pulp containers against each other, and two packing plates, each packing plate having an edge bearing against the associate roller immedi ately beyond such pressing place taken in the g

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