US857932A - Pulverizing or grinding mill. - Google Patents

Description

No. 857,932. PATENTED JUNE 25, 1907.

J. w. FULLER, JR.

PULVERIZING 0R GRINDING MILL.

APPLICATION FILED JULY 5, 1906.

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JAMES W. FULLER, JR, OF OATASAUQUA, PENNSYLVANIA.

PULVERIZING OR GRINDING IVIILL.

Specification of Letters Patent.

Patented June 25, 1907.

Application filed July 5,1906. Serial No. 324,717.

To all whom it pray concern:

Beit known that I, JAMES 1V. FULLER, Jr., a citizen of the United States, residing at Catasauqua, in the county of Lehigh and State of Pennsylvania, have invented certain new and useful Improvements in Pulverizing or Grinding Mills, of which the following is a specification.

My invention has relation to a pulverizing or grinding mill and in such connection it relates more particularly to the construction and arrangement of the mill to permit of the separation of the finely divided or ground matter from the coarser matter without the aid of screens and of the discharge of said finely divided or ground matter under air pressure from the mill, the same, embodying certain improvements in constructive arrangement of a mill of the type of the Hitzel U. S. Patent No. 778,452, of December 27th, 1904.

The principal objects of my invention are first, to provide a pulverizing or grinding mill arranged to permit of the exit of the air from the mill through only the discharge spouts thereof; second, to provide the mill with separating, collecting and discharging chambers controlled by air pressure, whereby finely divided or ground matter, impelled by the air is separated from the coarser matter in the separating chamber and forced by the air into respectively the collecting and discharging chambers and then by the air conducted through the discharge spouts of the mill, and the coarser matter in the separating chamber by gravity conveyed back into the path of the grinding means of the mill; third, to provide the mill with separating, collecting and discharging chambers in which air by pressure, induced by wings or blades in a suction chamber, and arranged at different angular positions with respect to each other is adapted to lift the ground matter from the grinding means of the mill vertically and to force the same transversely or radially from the suction chamber into the separating chamber and impelled therein by the air, under pressure separating the finely divided or ground matter from the coarser matter of the mill and conducting into and throughout the collecting and discharging chambers and with the air through discharge spouts of the mill, while the coarser matter by gravity is conveyed back into the path of the grinding means of the mill; and fourth, to provide a mill of the character described and for the defined purposes, whereby the degree of fineness of the ground matter, separated from the coarser matter, under air pressure, is under regulation by prolonging the confinement of the air laden with finely divided or ground matter in the separating chamber prior to final discharge of both through discharge spouts of the mill.

My invention stated in general terms, consists of pulverizing or grinding mill constructed and arranged in substantially the manner hereinafter described and claimed.

The nature and scope of my present invention will be more fully understood from the following description, taken in connection with the accompanying drawing forming part hereof, showing partly invertical section and partly in elevation, a pulverizing or grinding mill, embodying main features of my said invention.

Referring to the drawings 1, represents the driven shaft arranged vertically in the mill.

2 is a driving pulley for the shaft.

Within the casing 3, traversed by the shaft 1, is arranged an annulus or grinding ring 4. To the shaft 1, is suitably secured a carrier 5, which supports grinding balls 6, and a frame 7, which frame, preferably, by means ofrings 8, supports two series of wings or blades 9 and 10, arranged at different angular positions with respect to each other. In addition thereto, the shaft 1, also supports a platform 11, and sets the same as well as the carrier 5, and by the intervention of the frame 7, and rings 8, the wings or blades 9 and 10, in rotation, while the carrier 5, revolves the grinding balls 6, within the inner face of the grinding ring 4. The grinding ring 4, is supported by the casing 3, wlnch in conjunction with the base 12, forms a discharge chamber 13, within which the platform 11, is arranged and rotated by the driven shaft 1. Upon the casing 3, is arranged a second casing 14, consisting of a base 15, and a ring 16, separated from each other, by posts 17, which form openings 18, in the casing 14. The ring 16, serves to support a disk or cover plate 20, and this disk or cover-plate in conjunction with the casing 14, forms a suction chamber 2 1, within which the wings or blades 9 and 10, are rotated.

22 and 23 are casings arranged concentrically with respect to each other, and supported by the base 15, of the casing 14. These casings, 14, 22 and 23, form two chambers, the inner one will be hereinafter called the sepa- ITO rating chamber 24, and the outer one the collecting chamber 25. The collecting chamber 25, is closed at the upper end by a cap 26, forming a deflecting wall for air, as will be hereinafter described and which is supported by the casing 23, and a ring 27, carried by the ring 16, of the casing 14, while the separating chamber 24, communicates with the collecting chamber 25,, at the upper end formed by a ring 28, which, by means of bolts 29, passing through slots 30, arranged in the casing 22, and thumb-nuts 31, is adjustably secured to the casing 22. By the raising and lowering of the ring 28, the separating chamber 24, may be increased or de creased in size for a purpose to be'hereinafter more fully described. The separating chamber 24, by means of passageways 32, arranged in the base 15, of the casing 14, is connected at the lower end with the suction chamber 21, while the collecting chamber 25 by means of passageways 33 and 34, respectively, arranged in the base 15, of the casing 14, and in the casing 3, is connected at the lower end with the discharge chamber 13.

When the wings or blades 9 and 10, are rotated, in the suction chamber 21, the lower series of wings or blades 9, will elevate certain of the finely divided or ground matter from the grinding ring 4, and grinding balls 6, and throw the same into the path of the upper series of wings or blades 10. At the same time these wings or blades 9, will generate a current of air, which travels from the grinding ring 4, and balls 6, in an upward direction into the suction chamber 21, until the same is encountered by the upper series of wings or blades 10, which change the course of travel of the air from a vertical plane to a horizontal plane and by increasing the velocity of travel of the air force the elevated matter against the wall 22, forming in conjunction with the casing 14, the separating chamber 24. From the separating chamber 24, the air passes in an upward direction into the collecting chamber 25, by being deflected by the cap 26, and from thence it passes through the respective passageways 33 and 34, in a downward direction into the discharge chamber 13, from which it finally escapes through discharge spout 35, into the open. The elevated matter by means of the wings or blades 10, is likewise forced through the openings 18, of the casing 14, into the separating chamber 24, and against the wall 22, thereof. 22, the commingled finely divided or ground matter and the less finely divided particles of matter are separated from each other in the chamber 24, and the finely divided matter by the force of the current of air is lifted in the separating chamber 24, and deflected then into the collecting chamber 25, from whence it is conveyed into the discharge chamber 13, and forced through the spouts By striking against the wall 35, thereof, from the mill. The coarser particles of matter, however, which, owing to their specific gravity, not having been forced out of the separating chamber 24,- will descend therein by gravity through the passageway 32, back into the suction chamber 21, and from thence into the path of the grinding balls 6, and inner face of the grinding ring 4, for further treatment. The grade of fineness of the matter, however, carried by the air from the separating chamber 24, into the collecting chamber 25, s controlled by the ring 28, which owing to its position will increase or decrease the size of the separating chamber 24, and the distance the matter travels in leaving the same. Thus, when the ring 28, is shifted and held in the position desired, only such ground or finely divided matter of certain specific weight will pass the edge of the ring 28,'into the collecting chamber 25, as is carried thereto by the force of the current of air impelling the same from the separating chamber 24. The position of the ring 28, therefore, will determine the grade of fineness of the matter reaching the collecting chamber 25, by lessening or increasing the distance of travel of matter separated in the chamber 24. However, it will be understood that matter of extreme fineness, is directly carried from the separating chamber 24, into the collecting chamber 25, without being forced against the wall 22, as in this instance, the air lifts and conducts the same beyond the edge of the ring 28.

By discharging the matter from the mill under air pressure, the output of the mill in a given time is appreciably increased. By the separation of the fine matter from the coarse matter, without employing screens, and by being able ad libitum to determine the degree of fineness of the matter treated in the mill by simply adjusting the ring 28, in position with respect to the wall 22, the mill is not only much more simple in action, but the constant replacing of the screens as well as considerable of the expense of operation of the mill are avoided. By continuous discharge of air from the suction chamber 21, fresh air is drawn into this chamber through an opening 36, arranged in the cover plate 20, and due to the location of the wings or blades 9 and 10, there is formed-in conjunction with the rings 8, supporting the same a central passageway 38, through which matter to be ground by the grinding means can readily descend into the path of the ring 4, and grinding balls 6, through the opening 36. Matter, however, which possesses a certain degree of fineness will be affected in its descent in the passageway 38, by the wings or blades 10, and will be forced by the same directly from the suction chamber 21, into the separating chamber 24, without reaching the grinding ring 4, and balls 6, thereby greatly increasing the efficiency of the mill. Moreover, the expansion of the air which takes place immediately after its entrance into the suction chamber 21, tends to cool the grinding balls 6, and ring 4:, as well as to season the matter ground by the same, such as cement. Heavy particles of matter which for one reason or the other have been lifted, but have not been forced into the separating chamber 24, by the upper series of wings or blades 10, are conveyed back into the path of the grinding means 4 and 6, by the lower series of wings or blades 9, upon which the same descended and by the aid of flanges 39, against which the particles are thrown back, to the ring 4, thus counteracting the centrifugal force tending to deliver such matter upon the grinding ring 4.

Although the wall 22, forming in conjunction with the ring 28, baffling walls, has been illustrated, as partially inclined with respect to the casing 14, yet it should be understood that this wall may occupy a position which is parallel to the casing 14. This applies also to the wall 23, as to the formation thereof The function of the bathing Wall is toefiectually separate the finely divided or ground matter from the coarser matter while in the separating chamber 24, without the aid of screens and by the impacting force of the air from the suction chamber 21, prior to the liberation of the said matter, into the collecting chamber 25, and discharge of the same laden with air from the mill and the ring 28, in its position with respect to the wall 22, serves to determine the degree of fineness of matter, reaching the collecting chamber 25, from the separating chamber 24, by the control of the travel of said matter from one chamber to the other thereby.

Having thus described the nature and objects of my invention, what I claim as new and desire to secure by Letters Patent is In a pulverizing or grinding mill, outer and inner casings, rotatable blades or Wings arranged centrally in the mill within a casing arranged inside of said inner casing and forming by the operation of said blades or Wings the suction chamber of the mill and said outer and inner casings forming separating and collecting chambers, said inner casing provided with a ring adjustably supported therefrom and adapted to increase or decrease the outflow'of material from said separating into said collecting chamber, substantially as and for the purposes described.

In Witness whereof, I have hereunto set my signature in the presence of two subscribing witnesses.

JAMES lV. FULLER, JR.

Witnesses:

GEORGE KOPP, J. H. ZINOK, Jr.

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