US1088876A - Crushing and grinding mill. - Google Patents

Description

A. CALDOGNETTO.

CRUSHING AND GRINDING MILL.

APPLICATION FILED JULY 22. 1913.

' 1,088,876. Patented Mar.3,1914.

3 SHEBTS-SHEET L @Mum/:Toa 62X) L Emea ses A. CALDOGNETTO.

C'RUSHING AND GRINDING MILL.

APPLICATION FILED JULY 2z, 1913.

1,088,876.- f Patented Mar.3,1914.

3 SHEETS-SHEET 2.

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lA. CALDOGNETTO. ORUSHING AND GRINDING MILL.

APPLICATION IILED JULY 22, 1913.

1,088,876, Y Patented Mar.3,1914.

3 SHEETS-SHEET 3.

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CRUSHING AND (vi-BINDING MILL.

Specification of Letters Patent.

Patented Mar. 3, 1914.

Application led July 22. 1913. Serial No. 780,447.

To all Lo/wm it may concern:

Be it known that I, ALEJANDRO CALDoe- NETTO, a subject of the King of Italy, residing at No. 21.81 Bustamante street, Buenos Aires, Argentina, have invented certain new and useful Improvements in Crushing and Grinding Mills, of which the following is a specication.

This invention relates to a novel grinding and crushing machine, particularly adapted for grinding salt and similar materials. With regard to the grinding of salt, the machine which forms the subject matter of this invention, offers many advantages over all the machines of this kind heretofore used because it yields a considerable amount of work with a minimum consumption of power. With the apparatus constructed in accordance with the present invention, within a period of 9 hours, 10,000 kgs. of common rock salt may be ground with a con sumption of motive power of ls-1. hp., while with any of the machines actually in use, in order to grind the same amount, from 70 to 8O hp. would be required, for an equal length of time.

It is also an object of the present invention to provide means whereby the salt may etliciently be ground irrespective of its condition, that is to say, no matter whether it is damp or dry. This is a fact of much i1n portance as, owing to the hygroscopic properties of Chlorid of sodium or common salt, it is always a matter of serious difficulty to proceed to grind the salt when the atmosphere is moist or if on account of any other circumstance theV salt has come in contact with any liquid.

Besides the advantages already stated, the present salt grinding machine is adapted to be adjusted so that the salt may be ground to any desired degree of fineness, bv means of a screw device which controls the position of the fixed knife or cutter in relation to the moving cutters, as will hereinafter be fully described. Moreover, if desired, the ground product may at the same time contain tine and coarser particles, of different grades, without the necessity of changing the relative positions of the cutters, all as will later on be explained in connection with the working of the machine.

For the sake of clearness and in order to facilitate the understanding of this invention, illustrative drawings have been anneXed to this specification which show by way 0f example the manner of carrying the invention into practice.

In said drawings, Figure 1 is a horizontal section of the machine showing the essential parts of which the same is formed. Fig. 2 is a vert-ical section of the machine, on the line of its axis of rotation, and Fig. 3 is a vertical section perpendicular to that 0f Fig. 2, wherein may be clearly seen the toothed crown and cutter' knives, as well as the adjusting device for regulating the distance` on are mounted, at the side corresponding to the direction of rotation, the knives or cutters 17, made 0f steel. At the Lipper part of the machine, see Fig. 3, is arranged the charging hopper 5 through which the raw salt is fed into the interior of the grinding chamber, the walls of this chamber being formed by the casing 10. G indicates a toothed crown arranged within the said grinding chamber 0n the inside of the cover, the wooden teeth of the crown being inclined in the direction in which the shaft is rotated. The crown is disposed eccentrically with relation to the disks 2, with its lower end nearer thereto than its upper end, so as to produce a gradual reduction of the salt, and its teeth serve to retain the salt and te effect a preliminary crushing of the same by impact as it is being fed into the machine.

7 is a block of wood which is hinged `or pivoted in the bottom of the grinding chainber, and is raised or lowered through the agency of a screw 8 operated by means of a hand wheel 9. 1

The shaft 1 is supported by means of the bearings 11 and brasses 12,`and1to`tl1e shaft are keyed the two pulleys `13` andthe two fly-wheels 14.

15 is the discharge outlet for the ground salt. l l

- grades of the salt'. Y s .The'apparatus is entirely constructed of wood,.fexcepting of course, the steel cutters 16 is an orifice for the entrance of air for the purpose of creating a Ventilating air current and of efficiently assisting the discharge of the ground salt through the out-- let 15. Y

18 is a fixed knife or cutter of steel, se-

. cured to the block 7 and acting tangentially with relation to the rotary cutters 17.

After having thus described the essential parts of the apparatus, I shall now proceed to explain the operation of the same.

The central shaft 1 being started by means of the pulleys 13 which receive the motive power fromV any convenient source, common rock salty is fed into the machine through the hopper 5. The rapid rotatory movement ofthe cutters 17, together with the airY current created thereby and by the small air chambers 4L, will cause the salt to be drawn along toward the toothed crown 6, and by impacting against the same, it will be partially crushed up and will fall upon the block 7 .at the bottom of the vgrinding chamber. The position of this block, that is to say, the position of the Xed cutter 18 with relation to .the rotary cutters 17 is previously arranged and conveniently adjusted by means of the screw 8 andthe hand wheel 9, so as to cause the final product to be of the desired degree of ineness. When a layer of l'partially ground salt has been deposited on the block 7, the passage of the rotary cutter 17 past the fixed cutter 18 will remove therefrom the particles of salt whichV are of the desired degree of fineness, and such particles will be drawn through and carried outside of the chamber, owing to the strong suction produced in said chamber by the rotatory motion of the cutters 17 and of the wooden disks 2, the air being drawn into said `chamber at a high speed through the inlet 16. This entrance of air absolutely prevents any ground salt from falling through the said inlet 16, the salt being, caused to issue with great force through the outlet 15, and falling at a distance therefrom which varies from 4 to 10 meters, according to the degree of ineness of the ground product. It is evident that the finer the salt, the farther it will deposit on being drawn along by the air current. In view of this fact, a box consisting ofseveral compartments may conveniently be placed before the said outlet, so that the said lcompartments will receive the different.

and the bearings, shaft, pulleys, iynvheels .and the device for regulating the neness of the' producti Y' By, constructing the apparatus ofwood,-the`saltcannot come into cont-act I with any metallic surfaces to which it might charge outlet and of the air inlet may be varied at will, without departing from this invention. The outer part of the apparatus, may if desired, also be made of one piece, but it is preferred to construct the same of two or more pieces, arranged to'beV readily dismounted, for the purpose of cleaning the same.

I declare that what I claim Aand desire to secure by Letters Patent, is:

1. In a grinding mill, the combination, with a casing having inlets for air andthe material to be ground, and a discharge outlet located between said in'lets;`of coperating, stationary and rmovable grinding elements arranged within said casing; and means forrotating the movable grinding clement, to draw air continuously through the air inlet into said casing, and force it therefrom with the ground material through said outlet. y

Q. In a grinding mill, the combination of a rotatable disk provided at diametrically opposed points with a pair of knives; lneans for rotating said disk; a block pivoted at one end beneath said disk and provided with a knife coperative with the` first-named knives; and a vertically-arranged screw upon which the other end of the block is named element, to draw air continuously through the air inlet into said casing and said air chambers, and force it therefrom with the ground material. through said outlet. n

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

ALEJANDRO CALDOGNETTO. Witnesses: Y

J. II. AINSWORTH,

N. BARTLEY.

@Genies ef this patent may be obtained for ve cents each, byaddressing the Commissioner of latents.

Washington, D. G.

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