US1679997A

US1679997A - coal pulverizing machine

Info

Publication number: US1679997A
Authority: US
Publication date: 1928-08-07
Anticipated expiration: 1945-08-07

Description

Aug. 7, 1928. v 1,679,997 A E. v. VERNON Al. i

Pskcy' I VERNON WITN ESSES RALPH JACKSON a. 1f @W Y www mw @Tm y ATTO N gvtill Patented Aug. 7, 1928i UNITED STATES PATENT OFFICE.

EPERGY VENABLES VERNON, 0F KERESLEY, NEAR CVENTRY, AND RALPH JACKSON, OF GVENTRY, ENGLAND, ASSGNORS T0 ALFRED IHERBERT LIMITED, 0F BUTTS, 'VENTRY, ENGLAND, .A BRCLISH COMPANY.

COAL-PULVERIZING MACHINE.

,Application iled April .12, 1926, Serial No. 101,249, and in Great Britain May `52, 1925.

This invention relates to coal and similar pulverizing machines, of the kind in `which a passage broadly of Yshape is employed in .connection with the supply of coal to the machine, to enable metal or other parts liable to injure the mechanism to be separated. betoi-el entry into the machine. The coal to he pulveriz'ed descends one branch oit the Y and encounters an upward blast oit air from the stem portion thereof, and this is adapted to drive the coal through the other branch oit the Y into the machine, While allowing the metal or other parts to fall through the stem part oi the passage by which the air enters.

The elliciency of such a separating device largely depends upon obtaining the correct degree of tortuosity of the passages and also the correct air velocity through them, and the object of the present invention is to provide simple means by which these results can be quickly and easily obtained, and also to provide ready access to the adjusting means and to such parts of the passage as may become accidentally choclred in use.

According to `our invention, We provide a separator construction in Which a passage is arranged lor an air current movingin a substantially upward direction. Material is introduced into this air current through an opening in one Wall of the passagc. le provide means or varying the velocity of the air current moving past this opening, and this may be suitably accomplished by varying the area ot the air passage both above and below the incoming stream ol material. Ve also provide means for varying the tortuosity of the passage, by adjusting the position of the point around `which the material flows on entering the air current, or by adjusting the effective length of the air passage beyond the material opening. By means oi the different adjustments provided, the device may be easily adapted to various materials and diverse conditions of operation.

lnthe accompanying drawings, which illustrate a preferred construction of the separator passages,

Figure l is a vertical section through the part of the machine in which the passages are provided, the plane of the section being parallel to the axis ol' the machine, and

Figure 2 is a cross section on the line ITL-Il ot Figure l.

l In gne method of carrying out the invention, in which the Y-piece is constituted by an arrangement of partitions .in a hollow column 2 of substantially rectangular shape located at one side of the pulverizing chamber t3,` the feeding mechanism (not shown) is arranged at, and mounted upon, the upper part 4 of the column, thefeed enterin the latter through the aperture 5. D

The Y-passages may be unsymmetrical, and to form them, a partition 6 startine` from the upper part of the side of the colgumn .remote from the pulverizing chamber extends downwards from the edge of the aperture 5 at an inclination toivards the middle of the column. Here it is continued by a part 'T slightly curved towards the side ci? the column from which the partition commenced, and thereafter at 8 is inclined steeply towards the lower end of: the same side of the column.

The outlet `to the pulverizing chamber is an aperture 9 in the inner Wall 10 of the column, and from the upper and lower edges el this aperture extend other parti tions in the column indicated respectivclv at 11 and .12, and these co-operate with this partitions 6, 7 and 8 to form the Y-passage. The partition 11 forms a downwardly inclined lip at the upper portion olf the outlet .9, and extension 13 of the lower edge oit the lip terminating at about the middle ot'the curved part 7 of the partition above mentioned. The lower edge of this exten! sion 13 `forms the corner constituted by the junction of the two branches of the Y, one o'fnfhich receives the material from the supply device, as indicated by the arrows,

Whilst theother forms an upwardly inclined supply branch to the pulverizing chamber 3. The lower edge of the aperture 9 is -or a short distance inclined substantially at right angles to the lower sideot the lip 1l, and thereafter it unites with the partition 12 previously referred to, but as will be seen, the lower part oi? this partition 12 eventually is continued vertically downwards at 14. Thus, as will be seen, the

partition

12, 14 divides the lower part ot the column into tivo parts, of which the right hand part 15 serves for the introduction of hot air to the pulverizing chamber through the aperture 16, While the left hand part 17 y a tortuous path `isprovided for the coal into the machine, inasmuch as it first descends the supply branch 18 and then, by the current of air entering Ythe part 17 at the lower part of the stem 19, it is swept round the bend 20 of the Y through the Voutlet branch 21 and into the pulverizing chamber. The degree of tortuousness is dependentv upon the relationship between the lower edge of the lip .13 forming the bend or cornerof the Y and the vlower edge 22 of the vaperture 9 connecting with the pulverizing chamber.

By one feature, therefore, of the present invention, a slidable plate 23 is mounted upon the partition 12 forming the lower wall of the branch into the pulverizing chamberL and it can be raised or lowered so that its edge 24 acts as the lower edge of the aperture 9 and has its level correspondingly altered, whereby, as will'be evident, the passage round the` bend and into the chamber is made more or less tortuous. Thisv plate may be provided with a lug 25 formed by anging over a projecting portion along one of its edges, and an elon,n gated slot 26 can be provided in this iiange for astud or bolt 27 which is provided to extend through it and permit of clamping it at the desired extension.

ABy a further feature of the invention, the previously mentioned curved portion 7 of the wall of the Y- iece is formed on a plate 28 which is vertically slidable within the column 2. The continuity of the partition 6 is thus interrupted, and to prevent leakage and allow relative sliding motion they are `arranged to overlap at 29. Movement of this plate varies the distance of the Yteration in section.

partition 8 from the opposite one 12 thus varying the cross section of the rising pas j sage between them, and consequently the air velocity therein.

The lower edge of the lip 13 forming the that the plate may be raised or lowered as desired to make the desired adjustments.

rlhere is an aperture in the side of the column which is closable by a door 3a having a quick fastening device 35, and this aperture exposes both the

adjustable members

23 and 28 and also gives access to the interior of the Y-piece at the junction of the branches with the stem. It is thus possible quickly to make such adjustments as may be necessary to suit the coal supplied to the machine, and should any obstruction occur at this part it can quickly be reached and the trouble remedied.

In a certain type of machine to which this invention is applied, the mechanism of the pulverizer is carried by a shaft which eX- tends horizontally through the column containing the Y-piece. A space 3G, therefore, is provided in the column for the shaft, by means of spaced partitions 37 uniting with one another above the shaft at 38, and, if desired, below it also. There may therefore be Y-pieee passages on cach side of the space 36, as clearly shown in Figure 2, and the passages unite ,in the column at the upper and lower end. Vith this arrangement, a closabie aperture 33 is provided to give access to each of the adjusting means and interiors of the Y-piece. The shaft extends through apertures 39 in the walls of the column.

From the foregoing it will be seen that effective separation of the metal or the like from the coal to be pulverized can be ensured by adjustment not only of the form of the passages but also by the change in intensity of the air currents obtained at the point of separation, by altering the eii'ective cross-sectional area of the upwardly directed air passages.

lVhat I claim as my invention and desire to secure by Letters Patent of the United States is 1. A separating device comprising walls defining an air passage extending in a generally upward direction, one of said walls having therein an opening for material to be fed downwardly into the passage against the upcoming current of air, and means for varying the cross-sectional area of said air passage both above and below said opening.

A2. A separating device comprising walls deiining an air passage extending in a generally upward direction, means forming an opening for the `introduction of material 4from above into an intermediate portion of said passage, and means for varying the relative position of the walls of said passage both above and below said opening.

3. A separating device comprising walls deining an air passage through which air may flow in a substantially upward direction, and means for adjusting one of said walls relative to the opposite wall, said adjust-able wall having an opening therethrough Yfor the introduction of material into said air passage.

4. A separating device comprising walls defining an air passage through which air may How in a substantially upward direction, means forming an opening for introducing material into said air passage, and means for varying the tortuosity of the path through which said material travels.

5. A separating device comprising walls defining an air passage extending in a substantially upward direction, means forming an opening for introducing material into said passage, and means for varying the effective length of the air passage above said opening.

G. A separating device comprising walls defining an air passage through which air may flow in a substantially upward direction, means forming an opening for the lintroduction of material into said passage, and means for varying the position of the upper edge of the wall opposite said opening.

In testimony whereof We have signed our names to this speciication.

PERGY vENABLEs VERNON. RALPH JAcKsoN.