US1691585A - A cobpobation op new jebsey - Google Patents

Description

Nov. 13, 1928.

C. A. A. RAND FEEDING MEANS FOR CENTRIFUGAL GRINDERS Filed Dec. 17, 1923 11 51 9* 1 zg/fifi a a 1A E J 1/7, It I 57% J7 10 1,2 3% Z9 Patented Nov. 13, 1928 UNITED STATES PATENT OFFICE.

CHARLES A. RAND, OF CHICAGO, ILLI NOIS, ASSIGNOR TO INTERNATIONAL HAR- VESTER COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF NEW JERSEY.

FEEDING S FOR CENTRIFUGAL CBINDERS.

Application filed December The present invention relates to improvements in centrifugal grinders and has for its object to improve the efliciency of such machines, and more particularly of the feedmg means employed therewit In the type of centrifugal grinders lmown as rotary hammer mills, the reduction of grain, forage, etc is effected by pivoted hammers carried on a rotor which revolves at high speed above a perforated metal screen curved to conform to the circuit described by the hammers during rotation. The ground material is preferably discharged or drawn 0E and collected by a current of air drawn through the mill, and it is the object of this invention to-insure entrance of the required supply of air to the grinding chamber and to make the entering aircurrent take the path of the material being fed into the 'mill so that feeding is facilitated and there is no tendency for the material to choke or be thrown back.

A further object of the invention is to provide feeding means including a chute and an adjustable inlet gate or plate which afford a feed opening or throat that may be varied in size by adjusting the gate and to conduct the inflowing air by means of a conduit or duct on the gate to an opening or air port in the gate just above the feed throat and, therefore, always in the same relation to the material being fed, irrespective of the adjustment of the inlet gate;

With these main objects in view, the invention resides in the combination and arrangement of parts and details ofconstruction, or the equivalents thereof, hereinafter more articularly describedand claimed.

Re erring to the accompanying draw- Tig. 1 is a plan view of a grinder with the novel feeding device attached;

Fig. 2 is a similar side view; and Fig. 3 is a detailed view of the inner side of the inlet'plate or gate. The-grinder with which the invention is combined may be of anypreferred construction, and, in this instance, there is illustrated a grinder comprising a casing formed of a a lower fixed section 10 and an upper section or dome 11 which is hin ed to the lower section at 12 and is detachalily secured thereto as by a pivoted bolt 13. The lower sec- I 'tionlO is composed of similar end plates which support the sheet metal hopper or bin 17, 1923. Serial No. 681,073.

the discharge spout 16 by means of an ex- The upper haust fan in the usual manner. section 11 is also composed of similar end plates which may beof cast metal and these are connected by a rear curved sheet metal plate secured to the end plates in any suitable way, and reinforced by a series of transverse rods 17 connecting the edges of the end plates; The lower part of the front of the upper section of the grinder casing is also formed by a curved plate reinforced by rods similar to those above described, and the relative curvatures of the front and rear plates of the grinder are such that their upper ends are spaced apart vertically leaving a feed inlet which is, in general, tangentially related to the rotor within the casing. The rotor, which is shown in dotted lines in Fig. 2, is carried on a shaft 18 journaled in split bearings 19 formed in the respective edges of the upper and lower side plates 10 and 11. A'driving pulley. 20 is provided on the projecting end of lthe rotor shaft 18.

a The grinder construction just described forms no part of the present invention except as it cooperates therewith, and the parts more directly related to the invention comprise a feed chute or conveyor 21in the form of an open trough which is pivotally connected at 22-at the lower'edge of the feed inlet of the grinder and extends therefrom in a generally Horizontal direction. At the.

tends downwardly at an outward angle to a point adjacent the floor of the chute 21.

Chute 21 is adjustably supported by brace bars 24: which, together with bars25 engaging the sides of the chute, are attached at 26 to ears or lugs on the bottom of the chute 21.

The lower edge of the inlet gate 23 is supported by slotted arms 27 the upper portions of which are adjustable between clamp collars on a transverse rod 28 extending across the chute and connecting the upper ends of the bars 25. WVing nuts 29 are pivoted on the ends of rod 28 for clamping the supporting bars 27 at any desired adjustment. This provides means for adjusting the inlet gate onits pivot and varying the size of the feed aperture or throatallowed between the lower edge of the gate and the bottom of the feed chute, as required for the particular material being fed to the grinder; It will be evident that this construction permits variation of the feeding opening as desired and that the unused area of the grinder inlet is always closed by the ate 23 and dust, etc., thereby confined. Astlie feeding throat allowed by the gate is usually closed by the,

The slot 30 opens into or communicateswith T an 'air duct or conduit on the outer face of the late 23 and formed by a casing 31 se cure thereon. The conduit 31 opensnear the upper ed e of the plate at 31 where the air enters an is directed downwardly to the opening-or slot 30, through which it passes;

enterin directly above and being directed in the pat ofthe material being fed just be neath the lower edge of gate 23. In this manner the blast of entering air is caused to flow in the direction of travel of the material and assists the feeding operation as well as supplying the necessary amount of air to the grinderr It will be noticed that arrangement of the air port is such that it remains 1n practically the same relation to the material at all adjustments of the plate 23 and that the arrangementof the chute 21 and vented.

While the construction'above described'ex-, '45

plate or gate. 23 with'relation to the inlet opening of the mill is such that escape of dust andsuch material as may be thrown back from the rotor will be effectively preemplifies the preferred form of .the invention, it is obvious that certain changes in details of construction may be made without departin from the scope of the invention as define in the following claims.

What is claimed is: i I

1. Animprovement in centrifugal grinders comprising a'casing having a lateral feed opening, a trough shaped chute extending substantially horizontally from said casing for guiding materialto said lateral feed 'cpenl'ng, a gate pivotally mounted'so as to extend within the said chute downwardly and outwardly with respect to said casing, the gate having an air port formed therein, a shield covering the port, and means for 'adjustably supporting the gate.

2. An improvement in centrifugal grind- .ers comprising a casing having a lateral feed opening near (the top thereof, a trough shaped chute extending substantially horiing near its lower edge.

zontally from the top of the casing so as to guide material to the lateral feedopening, agatepivotally mounted with respect to the top of the casing and extending outwardly and downwardly therefrom within the chute, the gate being so positioned that its lower edge is adjacent the floor of the chute, a

casing secured to the gate so as tooform an air passage therewith, and means for supporting the gate withln the chute including means for adjusting the gate on its pivot.

3. The combination with a grinder casing having a lateral feed opening, of a troughv having a lateral feed opening, of a trough shaped chute extending therefrom and a v gate for said opening consi'sting of a plate adjustably pivoted at the upper edge of the opening and extending at an outward angle to a point adjacent the floor of the chute, said plate being provided Wlthfi-Il air open- 5 The combination with a grinder casing having a lateral feed opening, of a trough shaped chute extending therefrom, a gate its outer side extending from a 4. The combination with agrinder casing I for said opening consisting of a plate pivoted' at the upper edge of said opening and extending at an outward angle to a point adjacent the floor of the chute, said plate having a transverse slot near its lower edge and being provided with an air conduit on its outer side extending from a higher point onthe plate down to said slot, and adjustable supporting means connected to the lower part of the-plate.

6. The combination witha material treating device having pneumatic dischargingmeans, a chute of feeding means comprising an adjustable gate hinged at the inlet of the device, and means for supporting thegate so that it extends downwardly within the chute, said gate being provided with a hood ed air inlet port at a point adjacent the feed opening allowed beneath the lower edge of the gate;

7. An improvement chines comprising, in combination, a material treating device, a casing substantially comminuting maenclosing said device," a chute for directing material toward the device, an adjustable gate mounted iii-the chute in' proximity to the inlet of the casing for preventing the escape of material which has been acted upon by the device, the gate being formed with an air port for allowingthe passage of airthrough the machine along with the material acted upon, and a shield covering Leena the port and preventing the passage of material to be comminuted throughthe port.

8. An improvement in a feeding device for a mill comprising, in combination, ma-

5 terial directing means for guiding'material toward the mill, a movable gate in said means and located adjacent the mill for preventing the escape offmaterial which has been acted upon by the mill, said gate being 10 formed with a port allowing the passage of air through the mill along with the material acted upon by the mill, and a member secured to the gate so-as to cover said port and prevent the passage of material through the port toward the mill, said member being spaced from the gate and forming an air passage-way between itself and the gate.

In testimony whereof I affix my signature.

CHARLES A. A. RAND.

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