US584647A - hehneberg - Google Patents

Description

(No Model. Sheets-Sheet 1 2 H. PAPE 82 W. HENNEBERG. APPARATUS FOR GRADING AND REMOVING DUST FROM PULVBBIZED ORB, &c.

No. 584,647. Patented June 15, 1897.

K522265565. jz'zmzzam,

Q/Zn a. M

(No Model.) Sheets-Sheet 2 H. PAPE 8: W. HENNEBERG. APPARATUS FOR GRADING AND REMOVING DUST FROM PULVERIZED ORE, &c.

No. 584,647. Patented June 15, 1897.

W fg z7izdzzz%zizficzy A I 7 W W- I a J Ma UNTTED STATES PATENT Orricn.

HERMANN PAPE AND WILHELM HENNEBERG, OF HAMBURG, GERMANY.

APPARATUS FOR GRADING AND REMOVING DUST FROM PULVERIZED ORE, &c.

SPECIFICATION forming part of Letters Patent No. 584,647, dated June 15, 1897. Application filed October 31, 1896- Serial No. 610,762. (No model.)

To all whom it may concern.-

Be it known that we, HERMANN PAPE and WILHELM HENNEBERG, engineers, citizens of Hamburg, residing at 36 Hohe Bleichen, Hamburg, in the Empire of Germany, have invented certain new and useful Apparatus for Grading and Removing Dust from Pulverized Ore and other Gran ulated Materials, of which the following is a specification.

This invention relates to apparatus for removing dust from pulverized ores and such like substances and, if necessary, to separate the residue into grades of different size or gravity.

There are already in use various apparatus by which falling pulverized materials are acted on by currents of air which carry away the dust and deflect more or less the falling material so that the particles of different size and gravity are collected in separate groups. In such apparatus it is very desirable that the current of air should, as far as possible, act upon the powdered material throughout the Whole fall of the particles, that it should be practicable to vary the velocity of the current at different places, and that eddies should be avoided in the interior of the apparatus. In order to fulfil these conditions, the sides of the apparatus. by which the air enters are constructed of sieve fabrics or finely-perforated metal or other material. In passing through these the air-current meets with frictional resistance which is greater the smaller the apertures and the greater the thickness of the perforated or pervious material, so that the quantity of the air which passes through it depends upon its texture and thickness. Thus with a given volume of air exhausted the inflow of air from without maybe spread over a pervious surface of any desired area, and the air-current may thus be made to play upon any required heightof fall if the texture or material forming the sides of the apparatus is suitably selected. No eddies are formed, as the air-filaments, immediately after passing the pervious side, unite into one steady current passing through the apparatus; also, the velocity of successive parts of the height may be varied by varying the thickness and perforations of the corresponding parts of the sides.

Figure 1 of the accompanying drawings repby the air-current entering at g.

resents an apparatus of cylindrical form for the removal of dust. The material drops through the funnel a 011 the conical distributer 7) and thence in the form of an annular stream down the interior of the apparatus. By a central eXhaust tube 0 air is drawn through the pervious sides, separating the dust, which is carried away by thetube 0, while the material freed from dust passes away by the cone cl to the central chute d. Fig. 2 represents a similar apparatus modified so as to effect not only the removal of the dust, but also a classification or grading of the granulated residue. For this purpose there is provided an internal vessel 6, into which the least heavy particles drop, being deflected In order to prevent eddies at the upper edge of 6, air is drawn through it, entering through the pervious side 72, the conical deflector f preventing the air drawn through g from flowing upward without passing through h. Fig. 3 is a section of an apparatus of rectangular form.

The crushed material dropping through the funnel a is'first acted on by air entering at 1), driving forward the lightest particles, while the heaviest fall into the first recess and are carried away by a worm or other conveyer g. Air-currents entering at successive places int 41. act in the same way, separating the material into classes, which are removed by the conveyors h, i, and 7c, the dust passing away by the outlet f.

The arrangement of pervious sides in apparatus for grading pulverized materials may be varied in many Ways; butit is essential that they should be such that the air-currents are directed on the descending material through a considerable height of its fall.

The use of ventilating perforated sides in air sifting-machines may be varied as to many other details; but the object of ventilatingsides will remain the same viz. to distribute the air-current over a surface of such size and shape that the fallingmaterial is met throughout a sufficient length of fall by a steadyfiowing current of air.

Having thus described the natureof this invention and the best means we know of carrying the same into practical effect, we claim- In an apparatus for separating dust from pulverized materials, the combination with a cylindrical casing having pervious walls and provided at its upper end with a feed-- hopper and at its lower end with a dischargeoutlet, of an air-exhaust pipe extending up through the bottom of the casing to the upper portion thereof, a conical deflector arranged above the upper end of said pipe, a

cylindrical shell e arranged between the lower and a conical deflector arranged above said I 5 pervious side Walls and between the casing and shell, substantially as described and for the purpose specified.

In testimony whereof we have signed our names to this specification, in the presence of 20 two subscribing witnesses, this 12th day of October, A. D. 1896.

I-IERMANN PAPE. WILHELM I-IENNEBERG.

Witnesses:

E. IIH. MUMMENHOFF, OHAs. H. BURKE.

Images