US1186214A - Pulverizer-mill yoke and pusher. - Google Patents

Description

w s, McKEE. PULVERIZER MILL YOKE AND PUSHER. APPLICATION FILED JAN.15| 19 16.

1,186,214. Patented J une 6,1916.

2 SHEETS-SHEET l.

THE COLUMBIA FLANOGRAPH co., WASHINGTON, n. c.

W. S. MclKEE.

PULVERIZER MILL YOKE A ND PUSHER.

APPLICATION FILED JAN-15, 1916.

IIIIIIIII IIJ Patented J 1111 6, 1916.

2 SHEETSSHEET 2.

UNITED STATES PATENT OFFICE.

WALTER S. MCKEE, OF CHICAGO, ILLINOIS, ASSIGNOR T AMERICAN MANGANESE STEEL COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF MAINE.

PULVERIZER-MILL YOKE AND PUSHER.

Application filed January 15, 1916.

To all whom it may concern.

Be it known that I, l/VALTEP. S. MGKEE, a citizen of the United States, and a resident of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements'in PulveriZer-Mill Yokes and Pushers, of which the following is a specification.

My invention relates to grinding mills and has particular reference to an improvementin the form of the yoke and pusher of a pulverizer mill.

In mills of this description it will be understood that the grinding is accomplished by means of a plurality of large, heavy forged steel balls which are caused to travel at a high speed in a horizontal circular path, the balls being thrown or urged outwardly against the grinding ring by centrifugal force, and the grinding being accomplished between the balls and the grinding ring. Such mills are commonly used for grinding clinker 1n the production of cement. It will be understood that in such mills means must be provided for causing the balls to travel, the means commonly employed comprising a plurality of spaced arms to which a pusher shoe is applied, this shoe fitting over the end of the arm. It will be understood that but one side of this shoe contacts the ball and that the wear at this point is quite severe necessitating the renewal of the shoes at frequent intervals. In the means heretofore employed the scrap from the shoes has been great, the amount worn off being relatively small in comparison to the entire body of the shoe or pusher.

An object in the present construction is to provide a pusher so constructed that it may be substantially entirely worn out before being discarded, thus reducing the. amount of metal necessary to be scrapped.

The invention will be more readily understood by reference to the accompanying drawings wherein Figure 1 is an irregular section through a pulverizer mill, the view being taken on the line 11 of Fig. 2; Fig. 2 is a sectional plan view taken on the line 22 of Fig. 1. Fig. 3 is an enlarged fragmentary front elevation of one of the arms and pusher shoes, the shoe being shown as applied to the opposite side of the arm: Fig. 4 is a plan view of the same with a portion of the arm broken away to show the form of connection Specification of Letters Patent.

Patented June 6, 1916.

Serial No. 72,206.

to the shoe; Fig. 5 is a view similar to Fig. 8, showing a slight modification, the shoe likewise being shown in its reversed position, and Fig. 6 is a plan view of the construction shown in Fig. 5.

Referring to the drawings it will be seen that only a portion ofthe pulverizer mill is shown. The intermediate section 10 is intended torest upon and be supported by a bottom section. The intermediate portion provldes a horizontal shelf 11 upon which the grinding ring 12 is mounted. The axial center portion of the shelf 11 is vertically displaced to form a cone 18. A hub let is formed at the center of the cone, this hub accommodating the mill shaft 15. The grinding balls 16, of which four are shown, are retained in place by the grinding ring and the side walls of the cone 13.

superposed on the intermediate section is the top section 17 having a vertical annular flange 18 which provides means of attachment for the outside casing or shell 19. The top section is provided with vertical portions 20 to which screen plates 21 are secured.

As best shown in Fig. 2, the yoke comprises the hub portion 22, radial pusher arms 23, and fan blade brackets 21, the pusher arms and brackets being equally spaced around the periphery of the hub 22, the brackets, however, being located at a considerable elevationabove the pusher arms. A cylinder 25 is secured to the fan blade brackets and to this cylinder the fan blades, not shown, are secured. The hub 22 of the yoke is provided with a squared aperture at the axis thereof which engages a yoke support 26, keyed to the mill shaft 15, the yoke and yoke support being provided with a cooperating abutment and shoulder 27 by which the yoke is supported.

The pusher arms 23, as best shown in Figs. 3 and a, are preferably symmetrical about their longitudinal axes, of H shape in cross section and are enlarged at their ends as at 28, the side of the arm forming a triangular space 29 for a shoe 30 adapted to engage and cause the travel of the balls 16. The face of the shoe will be preferably slightly concaved as indicated at 31 to conform somewhat to the contour of the ball. The pusher arms at the base of the triangular enlargement 28, are provided with horizontal and vertical transverse apertures 32, 33. The

aperture 32 accommodates an integral lug 34 on the shoe 31, this lug being apertured to register with the aperture 33 in the arm and to accommodate a pin or key which serves to retain the shoe in its proper position.

In the constructions of Figs. 5 and 6 the pusher arms 37 are each provided with a horizontal transverse aperture 38 enlarged at 39 to accommodate a lug 40 on the shoe 41. A counter sunk fastening bolt 42 passes through the shoe, the lug 40, and the aperture 38 in the arm, and serves to secure the shoe in place.

It will be noted that the pusher arms 23 are symmetrical about a center line transverse of the vertical shaft, and that the shoes are so designed as to be applied to either side of the arms. In certain instances it. may be found desirable to operate the mill in a reverse direction, in which case the shoes may be readily applied to the opposite sides of the arms.

It will be seen that a pusher shoe constructed and applied as shown may be practically entirely worn out before being discarded, and that therefore the loss in scrap will be slight.

In the operation of the mill the shaft 15 is rotated by suitable means thus causing the rotation of the yoke through the engagement of the hub 22 with the squared yoke support 26. The pusher arms and their attached shoes engage the balls 16 causing their rapid travel in a circular path as defined by the grinding ring 12.

Obviously the form of attachment of the shoe to the pusher arm, as well as the form of the shoe, will be modified to suit difierent conditions, and such modifications as are within the scope of my claims I consider within the spirit of my invention.

I claim:

1. In a mill of the class described, the cornbination of a plurality of radial arms, the ends of which are enlarged, and which arms are substantially symmetrical about their longitudinal axes, thereby providing a triangular seat on each side of said arms, a shoe adapted to be fitted on either side of said arms and means for securing said shoe in either of the seats in said arms, substantially as described.

2. In a grinning mill, the combination of a plurality of radial arms, the ends of which are flared and which arms are substantially symmetrical about their longitudinal aXes, thereby providing an angular seat on each side of said arms, each of said arms being provided with a through horizontal and an intersecting vertical aperture, a shoe adapted to be fitted in either of said seats and provided with a projection adapted to enter said horizontal aperture, and fastening means occupying said vertical aperture, substantially as described.

3. In a grinding machine, the combination of a plurality of radial arms of substantially H shape in cross section, the ends of which are enlarged to provide an angular seat, a shoe adapted to occupy said seat, and fastening means for said shoe adapted to be passed vertically through said arm and said shoe, substantially as described.

l/VALTER S. MCKEE. lVi tnesses EUGENE C. BAUER, HARRIET J. HALPIN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. G.

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