US1137685A - Grinding-mill. - Google Patents

Description

R. M. WILLSON.

GRINDING MILL.

APPLICATION FILED mu 6. 1914.

1, 1 37,685, Y Patented Apr. 27, 1915.

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ROBERT M. WILL-SON, 0F RIVERSIDE, CALIFORNIA.

GRINDING-MILL.

Specification of Letters Patent.

Patented Apr. 27, 1915.

Application filed July 6, 1914. Serial No. 849,145.

To all whom it may concern:

Be it known that 1, ROBERT MARTIN WILL- SON, a citizen of the United. States, residing at Riverside, in the county of Riverside, State of California, have invented new and useful Improvements in Grinding-Mills, of which the following is a specification.

This invention relates toa grinding mill, and particularly pertains to a mill for grinding ores of the arrastre type.

It is the object of this invention to provide a mechanically driven arrastre in which the slimes are discharged centrally during the grinding operation.

Another object is to provide an effective means for rotating the arrastre arms by which the drags are moved over the materials to be ground.

A further object is to provide an arrastre which is simple in construction and which can be readily installed and worn parts easily removed and replaced.

A further object is to provide an efficient bearing for the arrastre arms by which slight frictional wear and ease of operation are insured.

The invention is illustrated in the accompanying drawings, in which:

Figure 1 is a perspective view of an larrastre constructed in accordance with this invention. Fig. 2 is a longitudinal section on the line 2-2 of Fig. 1, as seen in the direction indicated by the arrows. Fig. 3 is a, detail horizontal section on the line 3-3 of Fig. 2. Fig. 1 is an enlarged detail section and elevation of the central supporting column illustrating the construction of the central slime discharge.

More specifically, 6 indicates the floor of the arrastre which is preferably formed of concrete and 7 designates the annular vertical walls of the arrastre mounted on the floor 6 and extending a suitable height thereabove. This wall 7 is preferably formed of concrete and is constructed with an internal upwardly extending flange 8 and an external flange 9 projecting from its upper edge; an annular channel 10 being formed between the flanges 8 and 9, the bottom of which constitutes a track or runway for a series of rollers 11 mounted on brackets 12 carried by the arrastre arms 13. If desired, a metallic rail 14 may be mounted in the channels 10 on which the rollers 11 may travel.

The inner flange 8 projects a short dis tance above the flange 9 and its outer wall slopes outwardly from its upper edge to its lower edge so that oil or grease deposited thereon will readily drain to the channel 10. The upper edge of the outer flange 9 is formed with an annular groove 16, which is provided for the purpose of collecting such oil or grease as may splash from the channel 10 to prevent its spreading on the outer face of the wall 7.

Formed centrally of the annular walls 7 is a post 17 having a horizontally extending annular flange 18 on its upper end, and extending upwardly from the post 17 is a rigid spindle 19 on which a hub 20 is revolubly mounted. The hub 20 is formed with an annular bottom flange 21 formed on its underside with an annular runway 22 and is supported on a series of ball bearings 23 carried in a runway 24 on the upper end of the post 17. The inner ends of the arrastre arms 13 are rigidly mounted on the flange 21 and extend radially from the hub 20 as. shown in Fig. 1. The outer ends of the arrastre arms 13 connect with a ring 25 disposed above the outer flange 9 on the arrastre wall the ring 25 being formed with a channel 26 on its outer periphery adapted. to receive a cable 27 by which the arrastre wheel comprising the arms 13 and the ring 26 is rotated around the spindle 19. The cable 27 is crossed, as shown in Fig. 1, and after passing around direction pulleys 28 and 29 is passed around a driving sheave 30 mounted on a drive shaft 31 adapted to be rotated from any suitable source of power through a driving pulley 32 thereon.

The direction pulleys 28 and 29 are carried by rope connections 33 and 34 to posts 35 and 36, which connections are adjustable to tighten or slacken the driving cable 27 as desired. Connected to the arrastre arms 13 are the usual drags 37 which may be formed of any suitable weighted material and are attached to the arms 13 by means of chains 38 or other flexible connections.

Surrounding the central post 17 and spaced therefrom at its base is a metallic cylinder 39 rigidly secured to the floor 6 and terminating at a suitable point thereabove. Secured to the upper end of the cylinder 39 and extending thereabove is a screen cylinder 10, the upper end of which is attached to the flange 18; this screen cylinder forming a screened discharge outlet centrally of the arrastre. Formed in the floor 6 between the metallic cylinder 39 and the post17 is a discharge opening 41 which communicates with a conduit 42 leading to anysuitable point of discharge.

Formed in the wall 7' is an outlet or drain opening 43 which is normally closed by means of a gate 44 and is provided with'a screen 45; the gate 44 being opened when it is desired to drain the space inclosed by the Wall 7. T

In the operation of the invention, the materials to be ground are placed on the floor 6 within the Wall 7 in any desired manner, together with the necessary Water, which may be fed to the arrastre in any desired manner. The arrastre wheel is then rotated by driving the shaft 31 from any desired source of power; the rotation of the shaft 81 being transmitted to the arrastre wheel through the cable 27. On the rotation of the arrastre wheel the drags 37 will be hauled over the materials and the floor 6 thereby subjecting them to a grinding and pulverizing action. The centrifugal action of the drags tends to force the larger particles of the materials outwardly toward the wall 7, While the finer particles will be forced inwardly toward the post 17. Such materials as are held in suspension in the water and are of sufiicient. fineness will pass throughthe screen 40 and be discharged through theopening 41 and conduit 42 and thereafter subjected to any further treatment desired.

To prevent oil or grease from the bearings on the post 17 from getting into the arms tre, an annular groove 46 is formed on the top of the post 17 around the runway 24. The arrastre floor 6, annular wall 7 and post 17 are built of concrete, suitably reinforced if desired, and the inner face of the wall 7 and the surface of the floor 6 are lined with slabs of rock 47 to form a hard grinding surface.

WVhat I claim is:

1. In a grinding mill, the combination of and hub around the spindle.

a horizontally revoluble member, an annular 7 wall on which the outer portion of the revoluble member is supported, a plurality of dragscarried by the revoluble member for grinding materials within the space inclosed by the wall, and means through which the ground materials may be discharged centrally of said space.

2. An arrastre, comprising an annular wall, a post disposed centrally of the space inclosed by the wall, a spindle on said post, an arrastre wheel revolubleon said, spindle, and having a bearing on the annular wall, a plurality of drags carried by the arrastre wheel for grinding materials within the space inclosed by' the wall, and means arms, a cable arranged in the groove on said ring, and means for driving said cable to rotate the ring and arms. 7

4. Any arrastre, comprising an annular wall formed with inner and outer upwardly projecting flanges on'its upper, edge, a rail arranged between the flanges, a ring disposed above the wall, a plurality of arms connected to said ring, a hub to which the inner ends of said arms are attached, a spindle around which said hub is revoluble, rollers on said arms adapted to travel onthe rail, and means for rotating the ring, arms In witness that I claim the foregoing I have hereunto subscribed my name this 5th day of June, 1914. v V I I ROBERT M. WILLSON. Witnesses: 7

MARGUERITE BATES, MARIE BATTEY.

Copies of .this patent maybe obtained for five cents each, by addressing the Commissioner of Patents, Washington, I). 0. i

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