US2256841A

US2256841A - Grinding mill

Info

Publication number: US2256841A
Application number: US233433A
Authority: US
Inventors: Harry W Hardinge
Original assignee: Individual
Current assignee: Individual
Priority date: 1938-10-05
Filing date: 1938-10-05
Publication date: 1941-09-23
Anticipated expiration: 1958-09-23

Description

Sept. 23, l9`41. w. HARDINGE GRINDING MILL' Filed OCt. 5, 1938 ...ii/.lli

R. m FVE W.

, yet a further form of mill.

Patented 'Sept 23,1941

. UNITED STATE GRINDING MILL Harry W.

Hardinxe, Forest Hills, N: Y.

Application October 5, 1938, Serial No. 233,433

1 Claim.

This invention relates to mills for grinding materials'such as, metal, ore, cement, coal or the particularly to an improvement in multiple feed and discharge mills employing or the material itself for the grinding media and using a liquid, a gas, or the material itself as a conveying media. The present invention utilizes the inherent mechanical features of my original conical mill that is covered in Patent No; 908,861.

4One object of this invention is to provide a mill of the type under consideration wherein the material to be worked upon is fed into one end vof the mill and discharged through the same end or through the opposite end.

Another object is to provide a mill wherein the material to be ground orsdlsintegrated may be fed into both ends of the mill and discharged from both ends of the mill.

And another object of this invention is to provide a grinding mill wherein the material' to be disintegrated may be fed in through both or either ends of the mill and peripheral ports provided in the mill.

A further bject is to provide a grinding mill wherein the hollow supporting trunnions have extending therethrough means. material to bev fed into the mill; also serving as a discharge for the material.I

may be secured in place in any desirable manner.

discharged through With these and other objects in view, which may be incident to my improvements, the invention consists in the parts and combinations to be material l will travel' up hereinafter set forth and claimed, with the understanding that the several necessary elements comprising my invention may struction, proportions and arrangements, without departing from the spirit and scope of the appended claim.

In the drawing:

Figure 1 isa longitudinal sectional view of one form of my invention.

be varied in con- Figure 2 is a longitudinal sectional view of a l further embodiment of my invention.

Figure 3 is a detail view, partly in section, of

Referring to Figure l, I have shown a grinding mill having an outer shell'which formstwo conical compartments or sections l. end of each section I is closed by and it will be noted that adjacent to each end wall there is provided a cylindrical section 5. The end walls of the shell are formed with hollow trunnions 6 suitably journaled in supports, and as will hereinafter be described, the trunnions serve as discharge openings for the interior of the shell. l

It will be noted that the conical compartments i, the cylindrical section 5 and the side walls are provided with a lining 1 which conforms to the contour of these particular parts, and the an end wall,

ure 1, the

' A feed tube 3 extends into each hollow trunnion 6 and is concentric therewith, and each tube is supported in any suitable manner (not shown). The material to be ground is admitted into the interior of the mill through the feeding tube 3 by using a gas or a liquid as a conveyor. The linest of the ground material, will be conveyed by the current toward and discharged from the' outlets 8, as clearly indicated by the arrows. The coarser material that is not sufciently `subdivided will drop into the mass of grinding media 2 within the compa ments for further coin- .minution owing to the reduction of its velocity in the larger diameter of the mill. Another particular advantage of the present construction is that the larger particles of feed, instead of acting on the end walls of the mill as an air and material blast when gas' or liquid under pressure is used, will impinge on the incoming blast from the opposite feed tube 3.

In each section i,"the grinding media 2 will classify automatically according to size and weight. The largest grinding media will remain at the base of the cones where the material entering through the feed line 3 is crushed by the largest grinding media having the greatest superincumbent weight, the greatest height of fall and the highest peripheral speed. The smaller grinding media and the finer ground the cone toward the more restricted portion of the mill from which the ground material will oat toward the outlets B.

When the ground material is moving toward the outlet 6, and a gaseous conveying medium is being used, the diminishedvelocity of the current of outgoing conveying medium in the largest diameter region of the mill causes said gaseous medium to deposit any oversize material among the grinding media 2 for further reduction. It will be appreciated that the interior of the mill thus becomes a classifier and at the same time retains its well known characteristics as a con- `ical mill.

In Figure 2, I have shown a somewhatdiierent form of construction that may be employed.

It will be noted that .a cylindrical outer .shell is provided and the interior surface is so formed as toA provide two truncated cones I', the apices of which are adjacent to the center of the shell and the bases of which are adjacent to the end walls.l

A cylindrical each apex of the cones. As was the case of Figinner portion of the shell, the conical compartments l', dricalsection 5 are provided-with a lining 1'.

' In Figure 3, I have shown a construction which may beemployed when' it is desired to discharge lining the material through ports provided in thepeportion 5.a. is positioned betweenv the end walls and the vcylin riphery of theoi the mill. In this that the shell and lining 1" shell intermediate the end walls em ent, it can be seen plurality of apertures or ports 8. While the ports Feeding at oneend Feeding at both Feeding at one end Feeding at one end and Feeding at one *endv and discharging through opposite end.

and discharging through same end.

. Feeding at both ends and discharging through either end.

ends and discharging through both ends.

and discharging at both en Feeding at both ends and discharging through lperipheral ports in shell.

discharging through peripheral ports in shell.

' While I have shown and described the preaaneen ien-ed embodiment of my invention, I wish it to be understood that I dg not confine myself to the HARRY W. HARDmGn.