US2919863A - Machine for producing paper-pulp and like substances - Google Patents

Description

Jan. 5, 1960 E. J. A. LEJEUNE 2,919,863

MACHINE FOR PRODUCING PAPER-PULP AND LIKE SUBSTANCES Filed March 14, 1956 FIG. I.

INVENTOR [Wile J/Z Lqjeane BY 19%) M ATTORNEYS United States Patent MACHINE FOR PRODUCING PAPER-PULP AND LIKE SUBSTANCES Emile Jean Albert Lejeune, Paris, France Application March 14, 1956, Serial No. 571,482 I 3 Claims. (Cl. 241-68) This invention relates to a beating or grinding apparatus for defibrating, pulping or refining paper, wastepaper or other raw materials for paper and paperboard, such as cellulose, wood pulp, leather fibers, and the like. The described machine is intended for producing paper pulps in a continuous process.

The machine embodying the present invention consists of a cylindrical housing containing a rotor forming a closed ring provided with beating, grinding, cutting or crushing elements. The wall of the housing is also provided with stationary grinding or beating elements, as ribs, knives or grooves. Part of the housing wall forms a sieve consisting of an arcuate perforated sheet or plate which may be removed from the chamber and replaced. Furthermore, the machine has an inlet extending in the vertical direction through to the rotor shaft and a tangentially arranged conduit for receiving foreign bodies, such as nails, wires, screws, needles, and the like, which are separated from the mass being worked upon. The separating conduit is supplied with a water inlet permitting water to flow in the conduit in the direction opposed to the direction of rotation for the purpose of returning relatively light materials to the housing. A special feature of the invention is the disposition of the inner surface of the sieve defined by a part of the housing wall at the same radial distance from the center of the housing as the inner surfaces of the stationary grinding or beating elements formed on the other part of the housing wall. This disposition of the sieve permits the rotor to pass close over the surface of the sieve thus always keeping the latter clean. If the sieve is at a greater radial distance than the inner surfaces of the grinding or beating elements, the fibre materials spread a fibre felt on the sieve stopping the passage of pulp therethrough.

In accomplishing the foregoing and other objects, the present invention consists in the combination and arrangement of parts of the machine, a preferred form of which is illustrated in the accompanying drawings, wherein:

Fig. 1 is a longitudinal sectional View through the machine;

Fig. 2 is a sectional View of the machine taken along the line A-A of Fig. 1;

Fig. 3 is a fragmentary isometric view of a stationary grinding element in the machine of Figs. 1 and 2; and

Fig. 4 is a fragmentary isometric View of a grinding element of the rotor in the machine of Figs. 1 and 2.

Referring now to the drawings in detail, and initially to Figs. 1 and 2 thereof, it will be seen that a defibrating or pulping machine 1 embodying the invention is provided with a rotor Z mounted in a housing of the machine. The rotor has, either on the entire circumference or at spaced intervals thereon, ribs or teeth 3 or the like running parallel or inclined to the axis of the rotor and working against a circularly arcuate stationary memher 4 having ribs or teeth 4a or the like thereon. The rotor works with peripheral speeds of at least 30 meters per second.

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A circularly arcuate perforated sieve or screen 5, through which the pulp passes into a chamber 6, is fixed to the housing, as seen in Fig. 1. Through an outlet 7 in the chamber 6, the pulp can be discharged for further working-up. A conduit 8 for receiving separated foreign bodies is mounted tangentially with respect to the stationary member 4. The separating conduit 8 is provided with a regulable water inlet 9. At its lower end, the conduit 8 has a valve 1th for discharging the collected foreign bodies. The pulp is fed to the machine by means of an inlet 11 extending at right angles to the axis of rotation,

as seen in the drawings. It will be noted that the inner surface of the sieve 5 is the same radial distance away from the rotor 2 as the teeth 4a on the inner surfaces of the member 4.

As can be seen in the sectional view of Fig. 2, the rotor 2 is carried by a disk 14- which is, in turn, mounted on a shaft 15 suitably journalled in the housing and driven from a motor 16, for example, by Way of a belt and pulley transmission 17. On both sides of the disk 14 there is a space serving for the balance of any overpressure that might arise. Through an opening 12, air can be sucked in during operation, which is essential for the proper functioning of the machine. At the same time, the pulp can leave the machine through this opening in case of stowages or collection of material in the machine due to clogging of the sieve or the outlet pipe.

Fig. 3 shows the ribs or teeth 411 as stationary beating or grinding elements running parallel to the axis. Naturally, they can have a difierent form or different direction. The same refers to the heating or grinding elements 3 on the rotor, which have been shown as angled ribs, as best seen in Fig. 4.

The operation of the machine is as follows: The coarsely dispersed fibre material, coming for instance from a pulper, is fed to the machine through the inlet 11. The fibre pulp may be fed by gravity as well as by means of a pump. Upon reaching the rotor, heavy ingredients of the pulp, e.g. metals, stones, and the like, are hurled into the receiver conduit 8 for foreign bodies. Through the water inlet 9 a constant water flow is added for washing the fibres hurled into the conduit 8 back into the machine, whereas the heavier foreign bodies stay in the lower part of the receiver conduit and can be taken oif from time to time by opening the valve 10.

The fibre material being defibred between the stationany and the rotating grinding or beating elements 3, 4a passes through the sieve 5 into the chamber 6, from which it is discharged through the outlet 7. The pulp leaving the machine is perfectly defibred and dispersed. According to the kind of the grinding elements, the machine can be used as a defibring or as a refining machine.

Although specific structures of the machine embodying the invention have been shown and described herein, it is intended that the invention not be limited to such specific structures but be measured by the scope of theappended claims.

I claim:

1. A machine for beating paper pulp and like sub-- stances; said machine comprising a housing having an upper inlet opening and a lower outlet opening; a beating member joumalled in said housing below said inlet opening for rotation about a horizontal axis, said memher having a continuous cylindrical outer surface formed with circumferentially spaced teeth thereon; two circu larly arcuate elements disposed in said housing adjacent to and outwardly of said cylindrical surface of the heating member and substantially completely surrounding said surface, said elements being spaced from each other adjacent said inlet opening of the housing to define an opening aligned with said inlet opening for the flow of.

materials from said inlet opening to the space between said beating member and said elements, one of said elements having inner, circumferentially spaced teeth there on defining a Working space with said teeth of the heating member, and the other of said elements having openings therein; and a conduit extending substantially tangentially downwardly from said one element having teeth thereon, said conduit having an inlet communicating with said opening defined between said arcuate elements.

2. A machine as in claim 1; wherein said conduit has a normally closed, lower valved outlet, and a fluid conducting passageway assoeiatcd with said conduit for the introduction of fluid into said conduit to convey light materials upwardly therein for discharge into the space between said beating member and said one element having teeth thereon.

3. A machine as in claim 1; further comprising means driving said heating member at a peripheral speed of at least 30 m./sec.

References Cited in the file of this patent UNlTED STATES PATENTS Tomkins Sept. 21, Williams Aug. 7, Mitchell Sept. 3, Shelton Apr. 29, Williams June 20, Shartle July 29, Murphy June 8, Dawson June 2, Hery Sept. 5, Knoll Nov. 24, Ossing et a1. Dec. 27, Marshall Oct. 17, Gruendler Dec. 20,

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