US1684521A - Roll for beating engines - Google Patents

Description

Sept. 18, 1928. 1,684,521 R. SIMONDS 7 ROLL FOR BEATING ENGINES Filed June 12, 1924 2 Sheets-sheaf. 1

INVENTOR.

ATTORNE Sept 18, 1928. 1,684,521

H. R. SIMONDS ROLL FOR BEATING ENGINES Filed June 12 1924 '2 Sheets-Sheet 2 ATTORNEY,

Fatented Eiept. l8, 1928. 2

UNl'lED STATES. PATENT orr ca.

nnnnnn'r n. sinonns, or Barron, onro, assrenon 130 THE A. A. SIMONEDS-DAYTON COMPANY, or DAYTON, OHIO, A GOBPOEATION or OHIO.

ROLL FOR BEATING ENGINES;

Application filed June 12, 1924, Serial No. 719,494..

This invention relates to improvements in rolls for beating engines used in beating paper pulp, and in fly bars for such rolls.

While heating engines are old and well known, and have been the subject of much inventive effort and of many patents, there are certain problems which have long vexed the users of these machines. One such problem arises from the fact that acid in the pulp attacks the metal inblades, or fly bars as they are called, or the rolls whiehare a part of these beating engines. These fly bars have usually been made of steel, although other metals have been tried in an eilort to find one which in addition to having the other necessary qualifications was capable of resisting acids. But steel having been found far superior to any other material for this purpose, it is almost. universally used, notwithstanding comparative vulnerability to attack.

Acid and rust resisting'steels, now available for this purpose, have not fully solved the problem, because steel of this kind is too costly to permit out its substitution for ordinary steel in fly bars of the usual size. To meet this diliiculty I have devised a bar containing about one-third the quantity of material which is required to make the ordinary bar. Another object of my invention is to provide suitable means for attaching these small bars to the beater roll, means affording the necessary lateral supportv for the bars while leaving ample throat room, i. e., ample room in the spaces between the bars, and yet another object is to provide an improved form or throat, one which facilitates the escape of pulp from between the bars. Still another object is to provide "for supporting the bars without the use of wood or other non-metallicmaterial. An object of my invention, also, is to provide for equipping with my bars rolls which were made for the old type of bars, notwithstanding my new bars are about one-halt the width of and thinner than the old bars. I shall now describe my invention, referring to the following drawing, in which,

Fig. 1 shows in longitudinal section a pertion of a roll embodying my invention; Fig. 2 shows a portion of an end view of the roll shown in Fig. 1;

Fig. 3, is a view similar to Fig. 2, but showmodified arrangement for securing the parts the roll head;

Fig. 4 is a view similar to Fig. 1, but showing a method of attaching my narrow fly bars to a; roll designed for bars of about twice their width; r

Fig. 5 shows an end View of the roll shown in Fig. 42;

Fig. 6 shows the section of a stave at line 6 6, Fig. 1; and

Fi I" P (4, Fig. 4.

Referring first to the structure shown in Figs. 1. and 2, the roll comprises two circular plates or heads 10, keyed upon a shaft 11. At their rims these heads have inwardly extending annular projections 12, in which, on the outside oft-he heads, deep annular channels 13 are formed. The margins of these channels are rabbeted to receive cover plates 14. These plates are flush with the surface or the heads and are secured with countersunk screws, The peripheries of the heads are cylindrical in form, but have longitudinal slots 15 to receive the inner edges of fly bars 16, which extend from one head to the other.

The spaces between the bars 16 are closed by staves 20. These staves have a generally segmental form and are soproportioned that drawing them toward the axis of the roll clamps the bars between their apposed edges.

For the major part of its length each stave comprises a segmental body portion 21, lying in the Zone occupied by the inner edge of the fly bars. 'That is, the inner surface of the stave is flush with the inner edges of the contiguous bars. The end portions of the staves, which lie upon the heads, are formed upon the same radius as that of the heads. At intervals along the stave struts 22 project outwardly from the body 21, andextend annularly from one bar to the other. Along the longitudinal-edges of the stave are flanges '23, these flanges merging with the struts 22, the outer faces of the flanges being radial, so they can lie snugly against the bars. Thus the flanges and struts combined give the bars very adequate lateral support, whether the roll revolves in one direction or the other. 2

in Fig. 6, the cross section of the stave is shown, and it is seen that the flanges 23 give to the stave a channeldike form, the contour of the channel being a double ogee, the concave members of the two Ogees joining at the center of the stave. The flanges project the same distance as thestruts 22 and as is shown in the drawings they extend to about the cen- 7 shows the section of a stave at line eight fly bars.

ter of the bars. At the ends of the staves the depth of the channel is reduced an amount about equal to the depth of the slots in the heads.

The staves are secured to the heads by means of pins 24, whichpass through apertures in the bottom of the channel and in the periphery of the head and extend into the channels 13. The shanks are provided with slots into which wedges 25 are driven, one

edge of a wedge impinging on the end of the slot and the other edge on the wall of the channel 13 Thus a Very firm anchorage and lateral support are provided for the bars. Each bar is attached to one side of a stave by means of dowels 26 extending from one radial wall of the stave into slots formed in the bar. Similar dowels might be extended from each side of the stave, so that each stave would be positively tied to the bar on each side of it. Butthis would complicate the assembling of the roll, without compensative advantage. Tying one bar and one stave together permits the bars and staves to be put in place in pairs consisting of one bar and one stave, the wedges being put in but left loose until all of the pairsare in place. Then the wedges may be driven in a little at a time so the tension on the parts will be uniform, until finally all is snugand tight. Instead of pins and wedges, bolts 27 may be used to secure the staves, as in Fig. 3. Between the heads I place one or more spiders 28 to stiffen the roll. If desired the staves may be secured to the spiders by cap screws which pass through holes in the staves and screw into tapped holes in the spiders. For this purpose certain struts may be broadened, so the screws can pass through them, or the struts may be so spaced that none comes opposite a spider, and the cap screws simply pass throughthe body 21 of the staves. As the adoption of this expedient is within the capacity of any skilled mechanic it is deemed unnecessary to illustrate it.

According to the most approved modern practice, a beater roll contains one fly bar for each inchin its diameter; thus a roll four feet in diameter, over all, will carry forty The fly bars are left free standing, that is, the depth of the throat is approximately equal to the distance between the bars at their outer edges. To accomplish this and still adequately support the bars, laterally, it has been the practice to make the bars about twice the width of the area ex posed, and then drive in wooden strips to partially fill the spaces. My new bar here disclosed is but slightly wider thanthe depth of the throat, and yet half of thewidth of the bar is supported. This is accomplishedby supporting the bars with the channeled staves. The double ogee form of the throat is an improvement in that it avoids corners which tend to retain the pulp.

newal of fly bars.

lVhile malleable iron is not immune to attack, it is'protected in a beater roll by a coating which is soon deposited upon the metal, composed of substances contained in the pulp. A deposit of this kind on the active portions of the bars, the

prevented by the edges and front faces, is scouring effectof the pulp. Portions of the bars which are thus kept clean are peculiarly susceptible to attack by acid. Moreover, when the roll stands idle for a short time these parts rust and then when. the machine is put to work the rust discolor-s the pulp. This explains the desirability of my acid resisting and rust resisting bar- I shall now describe the structure shown in Figs. 4, 5 and 7. The heads 30 are mounted upon a shaft as before. The peripheries of the heads are cylindrical longitudinal slots as before, but the slots do not extend quite to the outer faces of the heads, a portion 31 remaining unslotted.

These heads are supposed to have been made a to carry bars about twice the width of my new bars, so it is necessary to modify the stares which support the bars. Referring to Fig. 7 it will be seen that the cross section of the outer part of the stave is the same as that shown in Figs. portion 21, the struts 22 and flanges 23. .As before, the inner surface of the body 21 lies flush with the inner edges of the bars. tending inwardly from thebody portion is a web 32, the'inner edge of which is adapted to lie in the slots in the peripheries of the heads. At each end the web is slotted, as at 83, and after the staves and bars are all in 1, 2, 3 and It has the body and provided with place on the roll, heated iron bands 34 are inserted in the slots, these bands being designed to bear on the inner margins of the slots 33, so that as the bands contract in cooling they draw the stavcs down tightly to the head. Thus I secure the staves and bars to this type of roll by the same means as that by which the old bars were secured.

In addition to the advantages mentioned my method of securing fly bars to beater rolls facilitates and renders less costly the re In the old methods, which included the use of wooden fillers, new fillers had to be put in when new bars were, at a large cost. W'ith my method all that is needed is the new bars. The original staves may be used over and over. Moreover, the labor of building up aroll by my method is much less. While I have described several modifications of my invention, its embodiment is by no means limited to those mentioned. These suffice to illustrate my it is to be understood that other modifications may be adopted without departure from the invention, but V rying' outwardly pro extend annularly heads mounted thereon,

extending spirit ot'my invention or exceeding the scope of. my claims, which are as follows:

1; A beater roll comprising a shaft, roll heads mounted thereon, fly bars extending from one head to the other, and staves closing the spaces, between the bars in the zone adjacent to the inner edges of the bars, and carrying outwardly projecting struts which extend annularly from one bar to the next, giving additional lateral support to the bars.

2. A beater roll comprising a shaft, roll heads mounted thereon, fly bars extending from one head to the other, staves closing the spaces between the bars in the zone adjacent to the inner edges ot the bars, said staves car- 'eeting struts which extend annularly from one bar to the next, and means for securing the staves and bars to the heads.

A beater roll comprising a shaft, roll heads mounted thereon, fly bars extending from one head to the other, staves closing the spaces between the bars in the zone adjacent to, the inner edges of the bars, said 'staves carrying outwardlyprojecting struts which extenn annularly from one bar to the next, and means independent of the bars for securing the staves to the heads.

A beater roll comprising a shaft, roll heads mounted thereon, fly bars extending from one head to the other, staves closing the spaces between the bars in the zone adjacent to the inner edges of the bars, said staves carrying outwardly projecting struts which from one bar to the next, means independent of the bars for securing the staves to the heads, and means tor-securin g the bars to the staves.

5. A beater roll comprising a shaft, roll heads mounted thereon, fly bars extending from one head to the other, and staves closing the spaces between the bars in the zone adja cent to the inner edges of the bars, said staves having outwardly projecting struts which extend annularly from one bar to the next, giving lateral support to the bars, and flanges along their edges from strut to strut, which flanges also lie against the bars and'lend support thereto.

(l. A beater roll comprising a shaft, roll fly bars extending from one head to the other, and staves closing the spaces between the bars in the zone adjacent to the inner edges of the bars, said staves having outwardly projecting struts which e tend annularly from one bar to the next, g additional lateral support to the bars, and. flanges alon then edges from strut to strut, which flanges also lend support to the bars, the apposed sides of said flanges being ogee in form.

i". A beater roll comprisingheads, fly bars from one head to the other, staves closing the spaces between the bars, and means for drawing each stave toward the axis ot the roll, thereby clamping the: bars between tae apposed edges of the staves, the clamping edges of the staves forming such an angle that apposed edges of adjacent staves are parallel.

8. A beater roll comprising heads, fly bars extending'from one head to the other, staves closing the spaces betweenthe bars, means for drawing the staves toward the axisof the roll, thereby clamping the bars between the apposed edges of the staves, and dowels connecting the bars to the staves.

9. A beater roll comprising heads, fly bars extending from one head to the other, staves closing the spaces between the bars, and in-' depeniirent means tor drawing one end of each stave toward the periphery of one head and similar means for drawing the other end of each stave toward the periphery of the other head, thereby clamping the bars between the appos d edges of the staves, the clamping edges of the staves forming such an angle that apposed edges of adjacent staves are parallel.

10. A beater roll comprising heads having longitudinally extending slots in their peripheries, fly bars extending from one head? to the other with. their inner edges lying in said slots, staves closing the spaces between, said bars, and means for drawing the staves to ward the axis er the roll, thereby clamping the bars between the apposed edges of the 11. In a heater roll, the combination of an equal number of fly bars and staves arranged alternately in a cylindrical endless series, and means for simultaneously drawing the staves and bars toward the axis of the cylinder.

1.2. In a heater roll, the combination of an equal number of fly bars and staves arranged alternately in a cylindrical endless series, each fly bar being attached to the edge of a stave; and means for drawing the staves toward the axis of the cylinder.

13. A segmental stave for use in securing fly bars to a heater roll and closing the space between t vo bars, said stave being hollowed out so that in cross section it is channeh like, thus leaving a roomythroat between the bars while affording ample lateral support for the bars, the edges of sand stave which abut the bars being radial to the center of a smaller circle than the circle of which the stave is a segment.

ll. A segmental stave for use in securing fly bars to a heater roll and closing the space between two bars, said stave being hollowed out so that in cross section it is channellike, the channel having the form of a double ogee with the two concave members joined, the of said stave which abut the bars being radial to the center of asmaller circle than the circle of which the stave is a segment.

15. A beater roll comprising heads having annular channels in their tacesnear their pcripheries, fly bars extending from one head to the other, staves closing the spaces between the bars, pins passing through apertures'in the staves and in the perimeters of the heads, the shanks of the pins extending into said channels, and wedges driven into slots in said shanks, and hearing against one end of the slots and the walls of the channels, whereby the staves are drawn toward the axis of the heads. a p

16. A beater roll comprising heads having longitudinally extending slots in their peripheries, fly bars extending from one head to the other with their inner edges seated in said slots, and staves closing the spaces between said bars, said staves having a generally segmental form in cross section, the portions which overlie the perimeters of the heads being formed on the same radius as the heads, while the portions of the staves extending from one head to the other reach inward to the are on which the inner edges of the bars rest.

17 A beater roll comprising heads having longitudinally extending slots in their peripheries, fly bars extending from one head to the other with their inner edges seated in said slots, staves closing the spaces between said bars, said staves having a generally segmental form in cross section, the portions which overlie the perimeters of the heads being formed on the same radius as the heads,

while the portions of the staves extending from one head to the other reach inward to the are on which the inner edges of the bars rest, and means for securing the sta-ves and bars to the head.

18. A beater roll comprising heads having longitudinally extending slots in their peand means for securing the staves t0 the heads. i

19. A beater roll having radially disposed fly bars whose radial dimension is substantially equal to the pitch on which'the bars are set in the roll, and means for closing the spaces betweenthe bars whereby to exclude pulp from the interior of the roll.

20. A heater roll having radially disposed fly bars whose effective radial dimension is substantially equal to the pitch on which the bars are set in'the roll, and means comprising members separable from the roll and from the bars for securing said bars to the roll.

HERBERT R. SIMON DS.

same radiusas the heads,

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