US1706254A - Grinding, crushing, pulverizing, mixing, and separating machine - Google Patents

Description

D. J. REES March 19, 1929.

GRINDING, CRUSHING, PULVERIZING, MIXING, AND SEPARATING MACHINE //V VE/VTOP Arm/m5) Filed Jan. 6, 1927 .vgmzz Jjzw.

wtzz' 4444) 16 54mm Patented Mar. 19, 1929.

DAVID JOHN REES, OF LONDON, ENGLAND.

GRINDING, CRUSHING, PULVERIZING, MIXING, AND SEPARATING MACHINE.

i Application filed January 6, 1927, Serial No. 159,402, and in Great Britain January 20, 1926.

This invention relates to grinding, crushing, pulverizing, mixing and separating machines and more particularly to that type in which a shaft rotates a carrier plate, spider or arms from which is suspended or to which is attached one or more roll heads, pushers, balls or other suitable heads which grind, crush or mix the materials against a ring or die.

The invention has for its object to provide an improved construction of machine.

According to this invention, resilient means are interposed between the driving member and the roll head or the like so that flexibility is obtained to control the centrifugal force or other pressures developed in the machine, said resilient means carrying or supporting the said roll head or the like and giving same a positive directional drive.

The said resilient means preferably consists of one or more springs of laminated or leaf type secured to the driving shaft of the machine and to which the roll head or the like is attached.

In order that the invention maybe fully understood, it will now be described with reference to the accompanying drawings in which Figure 1 is a sectional elevation of one form of grinding machine constructed in accordance with this invention, and Figure 2 is a plan view taken on the line 22 of Figure 1.

a is the main driving shaft mounted in the bearing 6. On the upper extremity of the shaft a is a pinion c meshing with pinion d on the driving shaft (2 e, e are roller hearings in the bearing 7) and is a suitable dust-proof packing.

Secured to the lower extremity of the shaft (1 is a spring carrier 9 for the two roll shafts k, k which carry at their lower extremities the roll heads 1', j.

The carrier 9 consists of a casting formed with two parallel grooves in which are held two curved leaf springs Z, Z by means of inverted channel shaped members m, m and keys a, n. The rolls shafts h, h are mounted on transverse shafts is carried by the two springs Z, Z. 0 is the usual die ring suitably positioned above the pan 3 of the machine, and p is the screen.

Depending from the carrier 9 is an arm or bracket 9 carrying a plough or stirrer 1".

The members m, m also prevent any torsional strain on the springs Z, Z when rotating at high speed, but instead of the members m, m, metal straps may be provided over the said springs.

The dot-and-dash lines in Figure l indicatethe positions of the roll shaft and roll head when the shaft a is stationary.

With a grinding or like machine constructed according to this invention, a positive direct onal drive is ensured and the necessary flexibihty is present to govern, increase or retard centrifugal or other necessary forces employed in the pulverizing or grinding of refractory materials.

Furthermore such flexibility will overcome r sk of breakage or collapse due to excessive h gh speeds or danger from the entry of forelgn materials such as bolts or other metal articles that may find their way into the feed along with the material to be treated.

Vibration will be reduced, and undue shocks absorbed, thereby making for reduced wear and tear costs.

Suitable means for lubricating the bearings of the machine may be provided.

The rise and fall of the roll head or the like over the surfaces of the die ring caused by the flexing of the springs will impart a skidding action to the grinding mechanism with the result that a larger output will take place.

WVhat I claim is l. A centrifugal grinding machine, comprising agrinding chamber containing an annular die, a central shaft arranged above sa d die, a carrier secured to said shaft, a pair of curved springs arranged parallel to one another and supported upon said carrier, a roll shaft pivotally mounted on said springs and a roll head rotatably mounted at the lower extremity of said shaft.

2. A centrifugal grinding machine, comprising a grinding chamber containin an annular die, a central shaft arranged a ove sald die, a carrier secured to said shaft, a pair of curved springs arranged parallel to one another and supported upon said carrier, means secured to said carrier and embracing said springs to prevent torsional strain thereof, a roll shaft pivotally mounted at both extremities of said pair of springs and a roll head rotatably mounted at the lower extremity of each shaft.

3. A centrifugal grinding machine comprising a grinding chamber containing an annular die, a central shaft arran ed above said die, a carrier secured to saic shaft, :1

pair of curved springs arranged parallel to one another and supported'upon said carrier, means secured to said carrier and embracing said springs to prevent torsional strain thereof, a transverse shaft mounted at the extremity of each pair of springs, a roll shaft depending from each transverse shaft and a roll head rotatably mounted at the lower extremity of'each shaft.

4. A centrifugal grinding machine comprising a grinding chamber containing an annular die, a central diving shaft arranged above said die, resilient means carried by said driving shaft, a roll'shaft' connected to said resilient means, a centrifugaily actuated roll carried by said roll shaft and adapted to cooperate with said die, and said resilient means giving said roll a positive directional drive Without interfering with its freedom to rise and fall in a vertical plane. Y

5. A centrifugal grinding machine comprising a grinding chamber containing an annular die, a central driving shaft arranged above said die ,resilient means carried by said driving shaft, a plurality of roll shafts connected to said resilient means, a centrifugally actuated roll carried by each of said roll shafts and adapted to cooperate with said die, and said resilient means givsaid rolls a positive directional drive Without interfering With its freedom to rise and fall in a vertical plane. 7

in testimony whereof he affixes his signature.

DAVID JOHN REES.

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