US1805780A - Countersunk suction roll shell - Google Patents

Description

w. H. MILLSPAUGH. ,7 0 CQUNTERSUNK SUCTION ROLL SHEILA 7 May 19, 1931.

,Filed Dec. 13, 1926 3 Sheets-Sheet 2 INVENTOR WILLIRM H. Mmannuau h y M 4 19M I ATLYFORNEV y 1931- w. H. MIILLSPAUGH 1,805,780

COUN TERSUNK SUCTION ROLL SHELL Filed Dec. 13, 1926 5 Sheets-Sheet 3 /NVEN Tor: MLLmm H. MLLLSPFIIUGH,

'Bv M a 6M ATTOENEY Patented May 19, 1931 w'rttimn. .mmnsrauen, orsa'nnusn. onrogn'ssienon'romnn PAPER'& TEXTILE MACHINERY COMPANY, or sam csxn, 0310, A conrona'rxonor onto Applicationflled December is, 19 2a- Serial a. 154,363.

The present invention relates to suction devices, and more especially to means for increasing the operative area in suction roll shells and plates of the general type comgmonly used inthe paper making industry.

Heretofore it has been common practice,

especially in the making of' suction roll shells or' similarelements for use in paper making, to drill cylindrical holes through In the wall thereof, of such size and number as to make of the shell, for instance, a cylindrical screen, the diameters of the holes or perforations varying accordin to the particular circumstances under w ich the shell or other element was to be used. In such shells, or the like, the practice, up to the present time, has been to maintain the same diameter throughout the length of each of the perforations, for press roll shells so or the like, and to concentricall countersink the outer ends, circularly, or suction couch roll shells or the like. The remaining imperforate surface had a somewhat lace-like formation or appearance, the portions extending from one perforation to another and lying between them being reguiarly shaped, each with a plurality of curved notches or indentations between which extended necks or strips merging with and connecting adjacent similar portions. This regular or lace-like imperforate portion serves to support the wireor other pulp carrying medium which travels on the cylinders throughout the suction operation. With such rolls, the amount of supporting surface for the pulp carrying medium (imperforate portion) is umiecessarily large and the available suction or operative forming surface correspondingly reduced-a waste or, excess of'supporting surface and a loss or insufficiency of sue- 4, looking in the direction'of the arrows;

tion area.

- The main objects of the present invention are to so construct a suction roll, plate, or like suction element or device, as to avoid to the greatest possible extent both of these objections and, while decreasing to the minimum the necessary bearing, supporting, 60 or bar surface, at the sametime increasing to-the maximum the effective, suction or vacuum forming area. In this way, the

totalefi'ective' area of the countersunk perforations will approach as'nearly as we ticable the totalarea of. that section. 0 the pulp supporting medium lying: or extending directly across the. open or operative side of the-suction box immediately underlying the adjacent perforate surface.

In order to more graphically disclose the construction and operation of the invention, comparative drawings are herewith presented showing similar fragmentary views of a common and well known con-. struction and of the construction embodying this invention. For ready comparison, the drawings illustrate the old construction and the invention in but one of many uses --that of suction roll or cylinder for paper making machines. To more clearly understand the construction, operation, and useof the invention, reference is made to said drawings, forming part of the present application.

In the drawings:

Fig. 1 is a side elevation ofv a suction roll of the old construction, partly broken away;

unpunched;

Fig. 2 is a cross section on line 2-2 of Fig. '1, looking in the direction of the arrows;

Fig. 6 1s a plan view of the rib construction between the countersinks of Fig. 4, with perforations and countersinks omitted;

Figs. 78-9 and '10 areviews similar to Fig. 45, showing different designs of countersinks and several different arrangements of such difierentdesigns;

- below, the sur -a modification with taper bore and Fig. 12 is a cross section on line 12-1 of Fig. 11, looking in the direction of the arrows.

While the invention has been shown as applied to suction rolls or cylinders for pa- ,per making machines, it is obvious that it may be used effectively and operated in the same way, with fiat or substantially fiat plates, as in the rectangular suction chamers of the usual suction boxes of Fourdrinier machines; thatit may be used in many other ways than that of paper making,in filters for instance. It is of course not intended to limit the use of the invention by any statement herein made. It is intended to protect it in all uses to which it may be ut, the single instance of a well known an general use being selected as one readily recognized and as merely illustration, in order to readily convey a clear and correct understanding of the invention.

In aper making, the best results are obtaine when the suctioin applied to the pulp layer is uniformly or evenly distributed over the entire surface exposed above the suction chamber, or as nearly sofas possible. Clearly, the old construction was inadequate in this respect. On the other hand, the forming or'supporting wire on which the aper sheet is made, must have adequate an even support on the surface through which the suction is effective. For best results, such support should be regular, even and uniform, relativel to the 0 enings through which the suction takes e ect. If the bar surface or area is not sufiicient the pulp car rying or supporting medium, under the action ofsuctionf will tend to collapse or sink cientsupport. Wherever, it sinks in this manner, 'the effective suction area is correspondingly decreased, the corresponding portion of the supporting member is distorted; and a very destructive rubbing or friction action takes place, with resulting waste of power and wearing or cutting of the supporting medium. fAlso, of course,

tion area without adding to essential support of the pulp supporting medium. Therefore, the most efiicient construction is that having a maximum effective suction area combined with a'minimum essential effective bar surface or area for adequately supporting the pulp carrying medium as it moves over the perforated surface during the action of the suction or vacuum. The present ace at the points of insufli v invention has been designed, more particularly, to accomplish these results.

In describing the invention in detail, the form and arrangement disclosed in Figs. 1-6 inclusive, of the drawings will be dealt with, the other designs and arrangements being treated separately. Referring to Figs.

1-6, the operative wall 1 of the shell, plate or like element, is drilled in any usual and well known manner to provide a plurality of spaced cylindrical suction holes or per-" forations 2 with the regular lace-like indented'intervening portion 3 shown, on enlarged scale, in Fig. 3. The drilling may be done by any usual and well known machines and methods now so generally used in the art. The wall 1 may be either cylindrical, as in a roll, or fiat as in a box, both constructions being well known in the paper making industry. The operations thus completed, produce the construction disclosed in Figs. 1-3 and well known prior to this invention. Of course, the holes may be drilled in various other positions, relatively to each other, than those illustrated. That is a mere matter of selection. Adjustment and regulation of the devices for operating the shell or plate, or of those for operating the feed of the drills, in one direction or the other,

relatively to said shell or plate, during the drilling operations, will be greatly controlling factors in positioning of the perforations relatively to each other. There are many well known types of such regulating and controlling devices, many of them more or less automatic. It is not thought that illustration of any of them will add in any way to a clearer understanding of the present invention. Accordingly none of them is illustrated in the drawings.

When the holes have been drilled, they are then counterbored, circularly, intheir outer ends, as in Fig. 1a, reducing considerably the imperforate area between perforations shown in Fig. 4 and providing an inclined or beveled countersunk wall 4 substantially'concentric with the respective erforation or bore. counter bores is such that the material between the nearest points of the circumferences of. adjacent counterbores is just sufficient to provide the necessary cross sectional width of the supporting bars which are completed by the next succeeding step. The preliminary circular countersink thus provided is then completed by re-shaping with a non-circular countersinking punch, stamp, or other suitable means of any desired construction. When a square is used, for instance, the width of the square will equal the greatest diameter of the circular counter- The diameter of t ese sink. On reference to Figs. 1a and 4 it will u excess metal-from the area of the final square tions as shown.

' forming the square. This final s uare countersink is then machined, polishe or otherwise smoothed to its final or finished condition. The same general idea is involved and. the same general operations are used in each of the other forms of non-circular countersinks herein disclosed, as will be readily understood. A slight variation of the first step of countersinking could be resorted to in the original formation of the perforations. Instead of forming them as true cylindrical bores, ,theycould be formedas frusto-conical, with the larger base at the endcorr'esponding to that in which I have shown the circu lar countersink.-the outerend. In that case, the larger end of the tapered bore should be of the same diameter as that of the circular countersink I have shown and the perforations should have the same relative posi- In that case these larger ends would be punched in exactly the same ,way as described for unehing of the square countersinks. The difierence would be in the resulting inclined countersunk wall. In this instance, there would be only the four triangular inclined areas disposed equi-distant about the center of the perforation, whereas, in the form in which there is firsta circular countersink, the final countersink is a continuous inclined surface of square outline with the hole of the perforation as its center. Such modified constructionis illustratedin fragmentar plan view and in enlarged cross section in igs. 11 and 12.

Every countersink'lmade by any of the i I non-circular countersinks may be used and above methods, radiates from the center of its respective bore 2. In this way, the effective suction area of each bore is increased by the difference between this greatest C11- cular cross sectional area and the area' within the outer edge of its enclosin countersink.

Thus the adjacent countersin s extend the total efi'ective suction area to include all otherwise waste space lying between the ends of the old cylindrical perforations, leaving only a fine continuous rib-like wall .5 between adjacent countersinks, as 1n Fig. 6, roviding a complete network of bar surface orthe uniform support of the ulp carrying medium. In this. way the e ective suction area is greatly enlarged-that of each erforation radiating to the full area of 1ts respective surrounding countersink. The increased effective area distributes the operative effect of the vacuum much more uniformly because much more completely, leaving only the very small areas of the internarrow or thin rib-likerwalls 5 between the countersinks provide uniform and adequate support for the forming or-pulp supporting medium, yet do not involve unnecessary 'waste of surface for that purpose.

ent, is:

out vacuum effect. The

They

provide only the surface essential to anade uate and uniform support of the wire,

or like medium, :with the least possible decrease 1n eflectwe suction area, while main taining sufficient contact to prevent leakage or loss of suction and to avoid sagging of the surface.

In the preferred form, Figs. 4-6, a square countersink is shown, the squares being arranged diagonally, relatively to each other, in the same circumferential or perpendicular row or plane, i. e. corner-to-corner insuch rows. Likewise, they are arranged side-to-side or parallel, relatively to each other in the rows running spirally of the. roll or dia onally of the plate.

In Fig.% the square form of-countersink is arranged so that those in alternate longitudinal rows are in the same circumferentlal plane, those of one longltudlnal row falling opposite the spacesbet'ween those of the rows on either side-a staggered construction,

In Fig. 8 each countersink is of diamond shape.

In Fig. 9 the counter-sinks are equilateral triangles grouped to form hexagons, which, of course, may be grouped asthe cells of a honeycomb;

In Fig. 10 hexagonal countersinks are. shown. V

In Fig. 11 is a view similar to Fig. .4, showing amodification with frusto-conical bore; and

I Fig. 12is a cross section on line 12-12 of Fig. 11. It is obvious that many other forms.of

the cylindrical perforations or the net-like web or bar lyin between the countersinks.

Having descri ed my invention, what I claim and desire to protect by Letters Pat- 1. In a rigid cylindrical suction element,

a wire supporting wall provided with a plurality of circular, perforations throughout the greater part of its surface said per.- forations having surrounding outwardly inclined countersunk surfaces'bounded at their figuration closely abutting one another on all sides'and collectively presenting a netouter edges by perimeters of angular conlike wire su portingsurface'carried by said element an lying between and filling the spaces between the countersunk outer ends of all said perforations, the aforesaid 5 countersunk areas greatly increasing the effective suction area of said element without appreciably weakenin the same.

2. In a rigid 'cylin rical suction element,

I a a wire supporting wall provided with a plurality of circular perforations throu hout the greater part ofits surface, each 0 said perforations having a surrounding enlargement at its outer end opening through the outer surface of said element and bounded by erimeters of angular configuration, the said perforations and enlargements closely adjoining one another on all sides with adjacent boundary faces opening through the surface of the element to provide relatively 201 limited separating spaces on the outer surface of the suction element defined by parallel lines, whereby the effective area of said suction element is greatly increased with out objectionably' weakening the said element and a net-like wire supportin surface is provided by the interconnecte limited spaces lying between the outer enlarged ends of the said perforations.

In testimony whereof I have afiixed mysignature.

WILLIAM H. MILLSP'AUGH.

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