US1116193A - Pulverizing or grinding mill. - Google Patents

Description

J. W. WOOD. PULVERIZING 0R GRINDING MILL. APPLICATION FILED AUG. 3, 1914. 1, 1 1 6, 1 93. Patented Nov. 3, 1914.

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J. W. WOOD. PULVERIZING 0R GRINDING MILL.

Patented Nov. 3, 1914.

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JACOBWINSLOW WOOD, 0F ALLENTOWN, PENNSYLVANIA.

PULVERIZING 0R GRINDING MILL.

Specification of Letters Patent.

Patented Nov. 3, 1914.

Application filed August 3, 1914. Serial No. 854,814.

of Pennsylvania,.have invented certain new and useful Improvements in Pulveri zing or Grinding Mills, of which the following is a description, reference being bad to the accompanying drawing and to the figures of 10 reference marked thereon.

My invention relates to pulvenzmg or grinding mills, and particularly to that class thereof in which the reduction or pulverization of ores and other substances is accomplished by the revolution of one or more rolls Within and against the inner surfaces of rings or annular dies, and in which said rolls are held in contact with said rings or annular dies by centrifugal force, when the mills are in operation. Perhaps the best known types of mills of this character, are the Huntington mills, such as illustrated in Patents 277,134, of May 8th, 1883, and

325,804, of September 8th, 1885, and the Gritlin mill, illustrated in Patent 409,57 9, of August 20, 1889. While the present invention is applicable to all mills of these and analogous types, for purposes of illustration, I have shown my improvements as designed especially for use in the Griffin mills. In this type of mill, it is the practice to form the roll head of an iron casting chilled on the periphery or circular surface which comes in contact with the die; and as the chilling of a casting reduces the strength of the latter in proportion to the depth of the chill, there is tendency to break. As usually constructed heretofore, the chilled portion of the roll head ends at about the upper line of the annular die or ring, and the gray metal only a fraction of an inch or less above the die and is ordinarily squared off. With this construction, the roll head has been liable to spall at the upper edge in the severe usage to which it is put, and I have found in practice that this makes the term of service of the roll head very irregular for when once the spalling begins it continues constantly, so that in a short time the roll head has the entire upper edge chipped off and thus has to be thrown away and replaced by another.

One of the features of my invention, therefore, relates to the formation of the roll head to overcome this danger, and, in brief,

I have reinforced the casting at its point of greatest weakness and have redesigned it to redistribute the metal in such a way as. to overcome the tendency to spall.

Again, in mills of this character, to facilitate the discharge of material therefrom, a four bladed fan is usually attached to the shaft just above the roll head, but in designing my novel roll head I cast the blades integral with the same, thus dispensing with a separate casting independently attached to the shaft.

The invention, therefore, consists in these novel features heretofore referred to.

The invention is illustrated in the accompanying drawings, in which- F'gure 1 represents a vertical elevation partly in section of a Griffin mill, showing my invention applied-thereto; Fig. 2 is a front View of my improved roll head; Fig. 3 IS a section thereof; Fig. at is a plan view of Fig. 2; Fig. 5 is a perspective View of said roll head; Figs. 6 and 7 are sectional and plan views, respectively, of a modified form of my invention; and Figs. 8 and 9 are similar views, respectively, of another form.

In these drawings, the mill shown is of the Griffin type, and in general comprises the chamber 1, secured to the support 2; the screen frame 3 and the encircling trough 4 receiving the material passing through the screens 5. The discharge spout is shown at 6, the ring or annular die against which the roll is revolved at 7. The roll shaft is shown at 8, and is suspended from a universal joint 9, secured to a drive shaft 10, driving from a pulley 11, or any other suitable gearing. The parts above referred to and marked with numerals are of the ordinary construction and will be understood without further description.

The invention in this case, as above stated, resides primarily in the construction of the roll head and one form thereof is shown in Figs. 2, 3, 4 and 5. Referring to these figures, the roll head is denoted in general by the numeral 12 and the lower part which bears against the die ring by the numeral. 13. The outer tapered face of the roll hearing against the die ring projects slightly above the upper face of the die and then tapers upwardly in the form of a hollow truncated cone a distance of some twelve or fifteen inches above the die. The metal 1 above the upper line of the chilled poi-r3011 of the roll head. Formed integral with the bottom of the roll head are projections 14 for performing the work of the usual stirrers', common on machines of this character.

. Cast integral with the roll head are the fan blades 15 which are also provided with the strengthening ribs 16. By making the roll head hollow and in the form of a truncated cone great strength is secured with lightness, and, as said above, the casting is reinforced at a point of greatest weakness.

Modifications of the structure are shown in Figs. 6 and 7 and 8 and. 9. In Fig. 6 the, roll head is made of less vertical height than in the other form of the invention and instead of being extended upwardly as a hollow truncated cone has the form of a rounded dome 17. So, also, in Figs. 8 and 9 the entire top of the roll head is rounded from a point just slightly above the top of the, die, the upper face being rounded and turned inwardly, as shown at 18. In both these modified forms, the fan blades are made integral with the body of the roll head, although it will be understood that this is not essential.

Copies of this patent may be obtained for tapering inwardly and formed with a hollowed interior.

2. A roll head having a tapered lower surface to bear on the die ring, and its widest diameter a short distance above the level of the die ring, and then tapering inwardly and upwardly, and interiorly hollowed out.

3. A roll head having a tapered lower surface to bear on the die ring, and its widest diameter a short distance above the level of the die ring, and in a curved line, and interiorly hollowed out.

4. A roll-head having a surface adapted to bear upon die rings having its metal.

strengthened upon the level of the die and tapering inwardly and having fan blades formed integral with the tapered portion.

In testimony whereof, I aflix my signature in the presence of two witnesses.

JACOB WINSLOW WOOD.

Witnesses:

HENRY GREENAWALD, V. Z. KoHLnR.

five cents each, by addressing the Commissioner of Patents, Washington, D. 6.

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