US503553A

US503553A - Paper pulp beating engine

Info

Publication number: US503553A
Authority: US
Publication date: 1893-08-15
Anticipated expiration: 1910-08-15

Description

(No Model.) 7 Sheets-Sheet 1.

A. E. REED.

PAPER PULP HEATING ENGINE.

No. 503,553. ented Aug. 15,1893

(No Model.) 7 Sheets-Sheet 2. A. E. REED.

PAPER PULP BEATING; ENGINE. No. 503,553. Patented Aug. 15, 1893;

(No Model.) 7 Sheets-Sheet 3. A. E. REED. PAPER PULP BEATING ENGINE.

No. 503,553. Patented Aug. 15,1893.

(No Model.) 7 Sheets-Sheet 4. A.E. REED. PAPER PULP BEATING ENGINE.

No. 503,553. Patented Aug. 15, 1893.

Fig. 5.

7 Sheets-Sheet 5.

no Model.)

M A E REED PAPER PULP BEATING ENGINE.

No. 503,553. Patented Aug. 15, 1893.

(No Model.) 7 sham-sheet c.

A. E. REED. PAPER PULP HEATING ENGINE No. 503,553. Patented Aug. 15, 1893.'

(No Model.) 7 Sheets-Sheet 7.

A. E. REED. PAPER PULP HEATING ENGINE.

Patented Aug. 15, 1893.

UNITED STATES PATENT OFFICE.

ALBERT E. REED, OF GRAVESEND, ENGLAND.

PAPER-PULP-BEATING ENGINE.

SPECIFICATION forming part of Letters Patent No. 503,553, dated August 15, 1893. Application filed October 16, 1891. Serial No. 408,928. (No model.) Patented in England November 25, 1890,1l0. 19,107-

To ctZZ whom it may concern:

Be it known that I, ALBERT EDWIN REED, paper-maker, a subject of the Queen of Great Britain and Ireland, residing at Devonshire Hou se,Pelham Road, Gravesend,in the county of Kent, England, have invented certain Improvements in Paper-Pulp-Beating Engines,

of which the following is a specification.

The said invention has been patented to me in Great Britain by Letters-Patent No. 19,107, dated November 25, 1890.

The object of my invention is to provide a paper pulp beating engine which while requiring less power to operate it will more effectually mix and operate upon the materials treated than is the case with beating engines as hitherto constructed.

According to my invention I combine with the engine in the line of travel of the materials treated and directly connected to the trough of the engine a centrifugal pump or forcing device by which the materials after being operated upon by the beater roll'or rolls and passing through the trough or channel are pumped or returned to the roll or rolls and so on continuously until the pulp is sufficiently prepared. The roll (or each roll) is arranged as hereinafter described so that it does not rotate in any considerable depth of pulp and has not therefore to perform the function of a lifter and propeller and consequently may have its ribs or bars-but slightly projecting and closer together than. usual so that between them there are not the considerable spaces which in ordinary engines prevent much of the materials being properly acted upon.

There may be combined with the engine a passage for the delivery of the prepared pulp to the stuff chests of the paper making machines so that when the charge has been properly treated the passage by which the pump delivers back to the roll or rolls of the beaters can be closed and the passage to the said stuif chests be opened so that the prepared pulp is pumped therethrough.

In order that my invention may be fully understood I shall now proceed more particularly to describe the same and for that purpose shall refer to the several figures on the annexed drawings the same letters of reference indicating corresponding parts in all the views.

Figure 1 is a side elevation and Fig. 2 a plan of a pulp beating apparatus constructed according to my invention in which a centrifugal pump is employed for circulating the pulp. Figs. and 4: are transverse sections of the trough respectively taken on the

lines

1, 2 and 3, 4: of Fig. 2. Figs. 5, 6 and 7 are respectively a side elevation, a plan, and a transverse section (on the line 5, 6 of Fig. 6) of a modified arrangement wherein a screw propeller is employed instead of a pump for circulating the pulp. Fig.8 is a central vertical section on an enlarged scale of the beater-roll and parts adjacent thereto.

Referring to Figs. 1 and 2 A A is atank or trough through which the pulp is caused to circulate andain which it is operated on by the beater roll B. The bottom of the part A of the trough or tank inclines downward from the front end where the roll 13 is situated to the opposite end a and the part at A also inclines downward from the end a to the end 1). The part A of the trough gradually reduces in width from a to b and at the end b terminates in a neck 0 which is connected to the suction end 0 of a centrifugal pump D. The bottom of the trough A A may be flat if desired but I prefer to make it, except just beneath the roll B, concave and preferably semicircular so as to have no angles for the pulp to collect in. This is shown clearly in Figs. 3 and 4.

The delivery pipe d of the pump is connected to the part A of the trough or tank in front of the roll B and delivers the material into the tank through a flared or widened passage so as to spread the pulp so that it is efficiently distributed to the roll B by running down thereto over the inclined surface o The pulp after passing under the roll at once runs down the inclined bottom of the trough Without accumulating or rising to any considerable depth or having to be lifted by the roll over any saddle or rising surface before it reaches the bottom of the trough. A branch c from the pipe 61 leads to the stuff chest or receptacle and athree way cock f is provided at the junction of the branch e and the inlet passage to the trough A so that by means of this cock the pulp pumped from the part A of the trough may be directed into the part A to be further acted upon by the roll 13 or when the pulp is sufficiently beaten the cock may be turned so as to direct the pulp into the stuff chests by the branch pipe 6. This arrangement allows of the beating engine being placed on the same level as, or lower than, the stuff chests. As the roll B has not to act as either a propeller or a lifter of the pulp the knives thereon may be arranged at a much finer pitch than is the case with ordinary heaters and so the rollcan be driven with less motive power than usual. The roll is mounted as usual in bearingsg fitted to slide in guides h bolted to the trough or tank A and provided with screwedrods t'and gearing for adjusting the roll. The roll B may be driven from any suitable prime mover by a strap passing round the pulley p on the end of the shaft or axis of the roll and preferably situated between the parts A and A of the trough. The pump D can be driven from the same end of the axis of the roll by a strap passing round the pulleys q r which are suitably proportioned to impart to the pump the desired speed relatively to the speed of the roll B. By driving the pump direct from the axis of the roll 13, if the driving strap slips off thepulley p or the motion of, the roll be otherwise stopped the pump will also be stopped and thereby prevent the accumulation of the pulp in front of the roll. I

The size of the pump and the speed of rotation should be regulated according to the quantity of pulp being operated on and it has been found in practice thatfor a beater capable of operating on five hundredweight of pulp what is known as a six inch centrifugal pump (in which the diameter across the vanes or blades is usually about twenty-four inches) is suitable.

D is a washer drum which may be of the usual construction mounted and worked in the usual manner.

a: is the usual emptying valve in the bottom of the trough A for the discharge of the pulp; but this is of course not necessary when the stuff chests are at the same level as or at a higher level than the pump and the discharge pipe e is used.

y is the wash out valve.

Instead of the centrifugal pump for circulating the pulp through the trough A A as hereinbefore described a screw propeller may be employed for the purpose arranged and operated as illustrated in Figs. 5, 6 and 7 of the drawings. In this arrangement the lower and discharge end I) of the trough A is connected by a tube or tubular passage d with the trough A just in front of the roll B. In

, this tube or passage d is fitted to rotate the screw propeller D driven from the axis of the roll B (by a strap or band passing round the pulleys q r) at such a speed as to cause the material to be fed to the roll as fast as it passes between the said roll and the lower grinding surface a constant circulation of the,

edfor certain purposes as the equivalent of a centrifugal pump, the latter is preferred as being more convenient and efficlent, but particularly because, as arranged 111 Figs. 1 and 2, the pump can be used to convey the stuff from the breaker to the beating engine, as well as to discharge it into the stuff chests, which is an advantage of great practical im* portance.

By means of apparatus constructed as hereinbefore described a complete mixing of the pulp may be effected very rapidly and by reason of the teeth on the roll B be1ng of fine pitch the roll B serves as a combined heater and refiner, while the apparatus 15 s1m ple and inexpensive in construction and more compact than ordinary machines of this kind andless motive poweris required to drive 1t.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is- I 1. In a pulp beating engine, the combination of a beater-roll, co-operating bed knives, a trough inclined away from the beater-roll, a return pipe or channel leading from the lowest level of the trough to the front of the roll and discharging at a level slightly above the bottom thereof, said pipe or channel being contracted until its inclination is directed downwardly in front of the roll, and a device working in said return channel for forcing a circulation of the pulp, substantially as described.

2. The combination with the inclined trough and beater-roll therein, of a return channel leading from the bottom of the trough to the front of the roll, a pump forming part of said return channel, a discharge pipe connected therewith and a controlling cook or valve, substantially as described.

3. The combination with the trough having an inclined bottom, the beater-roll and bed-knives located at that end of said trough where the level is highest, a pipe or channel leading from the other end of the trough and discharging tangentially against the bottom of the roll and in the direction of its rotation, said pipe or channel being contracted until it discharges against the bottom of the roll, and a forcing device working in said return pipe or channel, substantially as described.

4:. In a pulping engine in which the circulation of the paper-stock is effected independently of the beater-roll, the combination of a device for forcing circulation of the pulp with a channel leading the stock from the beater roll downwardly to another also downwardly inclined but gradually contracted channel, so as to convey the paper-stock without resistance due to obstructing or disturbing pockets into a pipe or conduit containing said forcing device, said conduit being a continuation or part of the said channel for discharging the pulp at the bottom of the beater roll, there to be acted upon by the grinders, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

ALBERT E. REED. Witnesses:

WILLIAM F. UPTON, 47 Lincolns Inn Fields, London, W. C.

H. D. HOSKINS, 9 Birchz'n Lame, London, E. O'.