US2311319A

US2311319A - Apparatus for forming powdered material into grains

Info

Publication number: US2311319A
Application number: US392654A
Authority: US
Inventors: Vogel-Jorgensen Mikael
Original assignee: FLSmidth and Co AS
Current assignee: FLSmidth and Co AS
Priority date: 1940-06-10
Filing date: 1941-05-09
Publication date: 1943-02-16
Anticipated expiration: 1960-02-16

Description

1943- M. VOGEL-JORGENSEN APPARATUS FOR FORMING POWDERED MATERIAL INTO GRAINS Fil'ed May 9, 1941 ATToRNEYf Patented Feb. 16, 1943 2,311,319 APPARATUS FOR FORMING rowps'nan MATERIAL I INTO GRAINS Mikael Vogel-Jorgensen, Co

nhagen, Denmark,

D assignor to F. L. Smidth & 00., New York, N. Y., a corporation of New Jersey Application May 9, 1941, Serial No. 392,654

In Denmark June 10, 1940 4 Claims. (CL 259-78) This invention relates to apparatus for forming powdered material into grains or Particles, so that the material may be more readily sub- Jected to further treatment. More particularly, the invention is concerned with a novel appa ratus for the purpose which operates more satisfactorily than those heretofore used in that the formation of very fine grains, which is generally not desirable, may be avoided, less power is required, the parts liable to wear are readily accessible, and the discharge from the apparatus of large lumps and cakes of the material is prevented.

Various types of apparatus have heretofore been employed for granulating powdered material and one such apparatus includes a rotary drum within which operate stirring means. In such a machine, the material is subjected to a somewhat violent stirring action resulting in the formation of a substantial amount of very fine grains, the presence of which in the final product is ordinarily undesirable. Another objectionable feature is that a considerable amount of power is consumed in operating the machine and, since the operating parts which are subject to wear are within a closed vessel, they are not easily accessible for inspection or renewal.

A second type of granulating apparatus commonly used includes a. stationary container within which operates a stirring device and in such machines, part of the material is formed into a layer on the container wall. The layer continues to build up during operation, and when, in time,

to the inner surface of the vessel will be brought into position to be acted on by the blades, and the building up on that surface of a layer of material which interferes with the operation of the machine is thus prevented.

Preferably the rotary blades are mounted on a shaft with successive blades along the shaft angularly offset. Also, the machine preferably includes a pair of such shafts and each shaft it breaks loose, large lumps or cakes of the maing blades within the vessel, the tips of theblades describing circles substantially tangent to the surface of the inner wall of the vessel. Material introduced into the vessel at one end is stirred and advanced by the blades to a discharge adjacent which are means by which lumps of material are broken up before they leave the vessel. The oscillation of the vessel during the stirring operation insures that material adhering carries a second series of blades which cooperate with a grate at the discharge from the vessel to effect breaking of the lumps. This second series of blades and grate may be replaced, if desired, by one or more cutting wheels which serve the same purpose.

For a better understanding of the invention, reference may be had to the accompanying drawing in which Fig. 1 is a longitudinal vertical sectional view of one form of apparatus constructed in accordance with the invention;

Fig. 2 is a plan view of the machine shown in i Fig. 3 is a sectional view on the line 33 of 1 Fig. 2; A

4 is a sectional view on the line 4-4 of Fig. 1; and

Fig. 5 is a fragmentary view similar to Fig. 1 showing a modified construction.

In the apparatus illustrated in Fig. 1, the vessel I8 has the general form of a trough and is arcuate in cross-section. It is provided with live rings I I resting on pairs of rollers I2 and each roller is mounted on a shaft I3 supported in bearings I4 and mounted on suitable bases I5. Rollers I8, mounted for rotation on vertical axes, engage the lateral faces of one of the live rings between the rollers I2 of one pair and keep the vessel from shifting endwise.

A pair of rings I1 encircle the vessel between its ends and plates l8 are connected to the rings and extend outwardly therefrom at the bottom of the vessel. A link I9 is connected at one end to a pin 20 between the plates and at the other end to a crank 2| on shaft}! which is mounted in suitable .bearings and is connected through a coupling 23 to a slow running shaft in a gear box 24.

Bearings 25 at opposite ends of the vessel support shafts 26a, 261), which extend through plates 21 closing the open ends of the vessel. Shaft 26a is driven by a motor, not shown, through coupling 28, and gear 29 on the shaft meshes with gear 30 on shaft 26b to drive the latter. Shaft 26b drives the high-speed shaft in gear box 24 set and each blade lies at an angle to its plane of rotation so that it may'perform its advancing function. Material is introduced into the vessel at one end through an inlet 34 and is stirred and advanced by blades 32 toward a discharge opening 35 through the bottom of the vessel at its other end, the discharged material passing down through a discharge chute "a.

A second series of blades 30 is mounted on each shaft above the discharge opening and these blades are secured in place by bolts 31 passing through the blades and through plates SI lying against the faces of the shafts opposite to those against which the blades bear. Lying over the discharge opening is a grate made up of bars 38 and the bars are in alignment with the spaces between the blades 36. The length of the blades is preferably such that they pass between the .bars at one point in their rotation, and the blades and grate bars, -accordingly, cooperate to break up any lumps of material which may be advanced thereto.

The blades 32 of the series on the respective shafts are in alignment and angularly offset so that they will not interfere with one another. The inner wall'of the vessel is of arcuate section and the arrangement is such that the tips of the blades 32 describe circles which are substantially tangent with the inner surface of the vessel. Also, the shafts 26a, 26b are rotated in opposite directions and in such manner that the tips of the blades sweep upwardly along the inner surface of the vessel.

In the operation of the apparatus, the material to be treated is introduced into the vessel in moistened condition or else is moistened after being fed into the vessel. The material is stirred and forced onward by the blades 32 toward the discharge and, at the same time, the vessel is continuously oscillated. By this oscillation, material which has adhered to the upper or lower parts of the inner wall of the container out of reach of the stirring and advancing blades will be periodically exposed to the action of the blades and the material so detached will be forced along to the discharge. At the discharge, any lumps collecting on the grate will be broken up by the action of the blades 36.

The modified form of apparatus shown in Fig. is similar in all respects to that'illustrated in Fig. 1, except that theblades 36 are omitted from the shafts 28a, 23b and .there is no grate at the discharge opening. The discharge of lumps is prevented by means of a cutting wheel 40 mounted on a shaft ll rurming in a bushing 42 which may be supported in any convienient manner. The shaft is driven by a motor 43 through gearing H and coupling 45. The cutting wheel 4| lies close to the surface of the inner wall of the container and as lumps are advanced along that wall, they are broken up before they can be discharged.

I claim:

1. Apparatus for forming powdered material into grains and similar particles which comprises a vessel having an inner wall of arcuate cross- -section, a mounting for the vessel on which it may be oscillated on a horizontal axis, means for oscillating the vessel on its mounting, a pair of shafts extending through the vessel and beyond the ends thereof, said shafts lyi parallel to but offset from said axis of oscillation, stationary bearings for the shafts beyond the ends of the vessel and independent thereof,'the ends of the vessel being constructed and arranged to permit oscillation of the vessel about the shafts, stirring blades on the shafts within the vessel, and means for rotating the shafts.

2. Apparatus for forming powdered material into grains and similar particles which comprises a vessel having an inner wall of arcuate crosssection and open ends, a mounting for the vessel on which it may be oscillated on a horizontal axis, means for oscillating the vessel on its mounting, a pair of shafts extending through the vessel and out through the open ends thereof, plates closing the open ends of the vessel, the shafts extending through the plates and the plates remaining stationary as the vessel oscillates, stationary bearings for the shafts beyond the ends of the vessel and independent thereof, stirring blades on the shafts within the vessel, and means for rotating the shafts.

3. Apparatus for forming powdered material into grains and similar particles which comprises a vessel having an inner wall of arcuate cross section, a mounting beneath the vessel on which it may be oscillated on a horizontal axis, means for oscillating the vessel on its mounting, a pair of shafts extending through the vessel and beyond the ends thereof, said shafts lying parallel to but offset from said axis of oscillation, stationary bearings for the shafts beyond the ends of the vessel and independent of the vessel, the ends of the vessel being constructed and arranged to permit oscillation of the vessel about the shafts, stirring blades on the shafts, and means for rotating the shafts.

4. Apparatus for forming finely divided material into grains and similar particles, which comprises a vessel having an inner wall of arcuate cross-section, a plurality of rollers on which the vessel rests and on which it may be oscillated on a horizontal axis, means for oscillating the vessel on said axis, a pair of shafts mounted for rotation independently of the vessel and extending through the vessel parallel to but offset from the axis of oscillation of the vessel, the ends 01 the vessel being constructed and arranged tr permit oscillation of the vessel about the shafts stirring blades on the shafts within the vessel and means for rotating the shafts.

MIKAEL VOGEL-JORGENSEN.