US 3297304 A
Description (OCR text may contain errors)
Jan. 10, 1967 E. A. WAHL 3,297,304
VIBRATORY CONVEYOR-MIXER APPARATUS Filed Feb. 8, 1965 3 Sheets-Sheet l EUGENE A. WAHL INVENTOR ORNEY um www Jan. 1Q, 1967 E. A. WAHL 3,297,304
United States Patent Oft-ice Patented Jan. 10, 1967 3,297,304 VBRATORY CONVEYGR-MIXER APPARATUS Eugene A. Wahl, 294 Forest Ave., Glen Ridge, NJ. 07418 Filed Feb. 8, 1965, Ser. No. 431,074 13 Claims. (Cl. 259-2) This invention relates lto a vibratory conveyor-mixer and more particularly to .apparatus for receiving granular or powdered materials at one end, mixing the materials and discharging the mixture at the other end.
Suitable -apparatus is available for receiving granular or powdered material from a supply hopper and discharging such material at a precise, constant feed rate. In various processes, it is also necessary to provide a homogeneous mixture of two or more such materials, in predetermined proportions, -and as a continuous stream. For example, in the manufacture of chemical fertilizer, it is desirable to coat fertilizer grade urea particles with a dusting clay to prevent interparticle cohesion, thereby to render the product free-flowing at the point of use. In this particular application, the ratio of urea particles to d-usting clay is about to 1. At present, the mixing of these materials is effected by passing them through a large, inclined, rotating drum. Such apparatus is expensive, massive and tends to break down the urea particles, which is undesirable.
An object of this invention is the provision of apparatus for mixing granular or powdered materials, which apparatus is `of relatively small size, low cost and high capacity.
An `object of this invention is the provision of apparatus for mixing granular yor powdered materials, which apparatus is of simple construction, provides an eiiicient mixing action, is easy to clean and requires a minimum maintenance.
An object of this invention is the provision of vibratory conveyor-mixer apparatus adapted to receive granular or powdered materials, intimately mixing together the materials las they move through the apparatus, and discharging the mixture at an end thereof in a continuous stream.
An object of ythis invention is the provision of apparatus for mixing granular or powdered materials, which apparatus comprises means for vibratorily moving the materials as a continuous stream in a generally horizontal plane, and a plurality of mixing stages interposed in the `path of ow of the stream, each stage elevating all or a portion of the stream and depositing the elevated portion of the stream upon the remaining portion prior to passage `of the stream to the succeeding mixing stage.
An object of this invention is the provision of mixing apparatus for granular or powdered materials, which apparatus is arranged to cause a continuous, vibrated stream of the materials to flow toward Ia discharge end thereof, -and which apparatus carries a plurality of spaced mixing stages position-ed lin the path of ilow of the stream and effective to provide a mixing of the materials by gravity fall.
An object of this invention is the provision of apparatus for mixing granular or powdered materials comprising an elongated, vibrating trough arranged to receive a continuous flow of the materials lat one end and vibratorily mov ing the materials yas a continuous stream toward a discharge end thereof, a plurality of inclined members spaced longitudinally along the trough, and extending into the path of flow of the stream, and means associated with each said member and arranged to direct a predetermined portion of the stre-am onto the inclined members in a successive manner.
An object of this invention is the provision of apparatus for mixing granular or powdered materials, said apparatus comprising a vibratable trough adapted to receive the materials yat the receiving end and vibratorily transporting them toward the discharge end, and a plurality of mixing stages spaced longitudinally within the trough and in the path of the material flow, each stage effective to divide the material ow into separated portions 'and depositing .the one portion over the other.
An object of this invention is the provision of a method for vibratorily mixing predetermined portions of granular or powdered materials to pr-ovide .a homogeneous mixture thereof.
These and other objects and advantages will become apparent from the following description when taken with the accompanying drawings illustrating several embodiments of the invention. It will be understood, however, that the drawings are for purposes of illustration and are not to be construed as defining the scope or limits of the invention, reference being had for the latter purpose to the claims which are appended hereto.
In the drawings wherein like reference characters denote like parts in the several views:
FIGURE l is a side elevational view of vibratory conveyor-mixer apparatus embodying this invention;
FIGURE 2 is a top plan view thereof and showing one form of the mixing stages;
FIGURE 3 is a front elevational view thereof;
FIGURE 4 is 4an enlarged, fragmentary, isometric view of the apparatus shown in FIGURES 1-3;
FIGURES 5 and 6 are transverse, cross-sectional views taken along the lines V-V and VI-VLrespectively, of FIGURE 4;
FIGURE 7 is a fragmentary, isometric view similar to FIGURE 4 4and showing another form of the mixing stage;-and
FIGURE 8 is a similar view and showing still another form of the mixing stage.
Reference now is made to FIGURES 1-3, wherein there is shown an elongated trough 10, of generally U- shape in cross-section, vibratorily supported on a channel iron 11 by means of the flexible leaf springs 12. The channel iron is secured to a flat base 13 provided with resilient feet, or vibration isolators, 14. Centered on, and secured to, the channel iron is an electric motor 15 and a pair of bearing :blocks 16 which rotatably support a shaft 17. The shaft 17 has secured thereto a pulley 18, which is coupled to the motor pulley by a V-belt 19. A crank arm 29 has one end eccentrically mounted on the shaft 17 and .the other end connected to a crank pin 21 which is rotatably coupled to a block 22, the said block being welded, or otherwise secured, to the bottom of the trough 10.
The apparatus described to this point is a conventional vibratory conveyor, that is, rotation of the shaft 17 results in an orbital vibration of the trough in a vertical plane, whereby granular or powdered materials deposited into the trough, at the left end, are vibratorily transported along the trough and discharge at the opposite, open end thereof.
As shown in FIGURE 2, the left end of the trough is closed by an end plate 25. Spaced from the end plate 25 is a vertical gate 26, which is adjustably mounted to provide a desired clearance area between the lower side edge of the gate and the bottom of the trough, as will be described in detail hereinbelow. Longitudinally spaced along the trough and a plurality of material mixing .stages A-E, each stage, in this embodiment of the invention, consisting of an inclined, U-shaped chute and associated oppositely-disposed, vertical deflection plates.
Referring specifically to the mixing stage A, the deflection plate 28 rests upon the trough bottom, has one offset end welded to the chute 27 and another offset end welded, or otherwise secured to, the vertical side wall of the trough. The other deflection plate 29 is similarly constructed and arranged but reversely disposed. The left end of the chute27 rests upon the trough bottom, whereas the other end of the chute is elevated a predetermined distance above the trough bottom. Desirably, but `not necessarily, the Width of the chute 27 is substantially equal to one-half that of the trough. The other mixing stages B-E are of similar construction.
The space between the trough end plate 25 and the vertical gate 26 constitutes a receiving chamber for one of the materials, which material, in the case of apparatus used for coating urea particles with dusting clay, would be the urea particles. Such particles can be fed into the receiving chamber at a constant predetermined rate by means of conventional material feeder apparatus, said rate being selected to maintain a steady flow of the material out of the chamber through a discharge opening provided by the gate 26. If, now it be assumed that such discharge opening of the receiving chamber, that is, the space between the lower edge of the gate and the trough bottom is one inch, and that the trough has a width of 12 inches, vibration of the trough will cause a continuous stream of the urea particles to flow out of the chamber and along the trough bottom, as indicated by the solid arrows, such material stream having a cross-sectional area of 12 square inches.
Referring to the front elevational view of FIGURE 3, this view shows the last mixing stage (stage E in FIG- URE 2), comprising the chute 27 and deection plates 28', 29. The area defined by the bottom of the chute and the two deflection plates is identified by the numeral 32. It is here pointed out that the components of all mixing stages are of similar construction and arrangement. It will be clear, then, that if the chute 27 (FIGURE 3) has a width of 6 inches and has its elevated end spaced 1 inch from the trough bottom, the cross-sectional area of the opening 32, as well as all similar openings of the other mixing stages, is 6 square inches.
Referring again to FIGURE 2, the clay dusting powder is applied in a continuous stream by means of conventional material feeder apparatus, directly onto the moving stream of urea particles at a point between the gate 26 and the first mixing stage. Since the urea particles are under continuous vibration, some mixing action takes place as the stream moves to the first mixing stage. This composite stream of material is divided into three distinct portions at the mixing stage A, a first portion flowing along the vertical defiection gate 28, a second portion flowing along the deliection plate 29 and the third, central portion flowing up the inclined chute 27. If the dusting powder is applied centrally to the flowing stream of urea particles, a greater percentage of the powder will flow up the inclined chute than along the two deflection plates. However, this is of no particular `consequence in the overall operation of the apparatus. The two portions of the stream passing along the deflection plates flow together under the elevated bottom of the chute and are recombined as they pass under the elevated chute end. That portion of the stream which moves vibratorily up the inclined chute falls upon the underlying portion of the stream.
One advantageous characteristic of the vibrating trough is the spreading out of the vibrated material to a substantially uniform depth across the entire width of the trough. Such material-spreading action is effected over a relatively short length of the trough. Hence, the two layers of the divided stream, that is, the first layer moving along the trough bottom and under the elevated end of the chute, and the second layer formed by the material falling from the chute end, are immediately subjected to a combined mixing and spreading out action, due to vibration. Thus, a fairly well mixed stream, of substantially uniform depth, reaches mixing stage B. Here, a similar division of the stream into three sections takes place, with substantially one-half of the stream being elevated and permitted to fall upon the underlying half. Thereafter, the now more thoroughly mixed stream iS spread out to substantially uniform depth during its vibratory movement to the third mixing stage. The number of mixing stages is selected with regard to the particular materials to be mixed and the proportion of one material to the other, all to the end that a continuous stream, having a desired degree of homogeneity, flows from the discharge end of the trough.
Referring now to the enlarged, fragmentary isometric view of FIGURE 4, it will be seen that the vertical gate 26 is provided with offset ends 33, with a vertical, elongated slot formed in each. Fastening bolts 30 passes through these slots, which bolts, together with cooperating nuts 31, serve as means to secure the gate in fixed position on the trough with a desired spacing between the gate and the trough bottom. This view clearly shows the inclined position of the chute 27 having the offset ends of the deflection plates 28 and 29 secured thereto, as by welding. The other offset ends of the deflection plates lies flush against the opposed, inner surfaces of tthe trough side walls and can be secured thereto, as by welding.
FIGURES 5 and 6 are, respectively, transverse crosssectional views taken along the lines V-V and VI-VI of FIGURE 4. FIGURE 5 is taken along the vertical, medium plane of the chute 27, in which plane the proximate walls of the deflection plates 28 and 29 are spaced from the vertical walls of the chute. On the other hand, FIGURE 6 is taken along a vertical plane spaced from the chute 27 and clearly shows the opening 32 through which the lower portion of the stream passes as it receives the material falling from the elevated end of the chute.
A modified construction of the mixing stages is shown in FIGURE 7. Here, a fiat plate is cut along mutually perpendicular center lines and the cut portion bent upwardly to form the wall 35. The side portions of the plate are then offset to form the sides 36 and 37, which sides fit snugly within the trough. After inserting the plate into the trough, the bottom is inclined at a desired angle and the vertical sides 36, 37 are secured to the trough, as by welding, or by means of suitable clamps. When the trough is vibrated, the urea particles move out of the chamber X, through the opening provided by the gate 26, and toward the inclined plate which constitutes the first mixing stage. The clay dusting powder is applied thereto, as has been described above. Upon reaching the mixing stage, the stream is divided into two portions, one portion moving up the inclined plate section 38 and the other portion passing along the vertical Wall 35 and under the elevated plate section 39. Due to the spreading action of the material stream under vibration, as described above, the lower portion 0f the stream spreads out under the inclined plate and emerges from under the plate as a stream of substantially uniform depth. Similarly, the other portion of the stream, which passes up the inclined plate, spreads out to a uniform depth as it passes beyond the wall 35 and falls upon the underlying stream. The succeeding mixing stages are made and arranged in a similar manner, the number of such stages being selected to provide the desired degree of particle mixing at the discharge end of the trough. Preferably, adjacent mixing stages are reversely disposed relative to each other, that is, the portion of the material stream proximate to the rear wall of the trough, will be elevated at one stage and the portion proximate to the front wall will be elevated at the next stage.
longitudinal slot 41, having a Width of about 1 inch, extends from the elevated end of the plate and terminates at a point spaced from the other end. A rst angle plate 42 lies in a plane normal to that of the plate 40 and is welded thereto. The angle plate has a portion 43 forming an angle of approximately 45 degrees with the elevated end of the main plate and an offset portion 44 which lies flush against the vertical wall of the trough. A second angle plate 42' is similarly constructed and arranged. The offset end portions 44, 44 can be welded, or clamped, to the walls of the trough, thereby securing the assembly in fixed position with the main plate 40 inclined at a desired angle to the trough bottom.
As the stream of urea-particles moves from the receiving chamber to the inclined plate, the dusting powder is fed thereon, preferably centrally of the trough axis. The entire stream of material moves, vibratorily, up the plate 40 and during such movement progressively more and more of the particles of both materials fall through the slot. Due to the vibratory action of the trough, that material which falls upon the trough bottom tends to spread out while continuing its forward movement. That material which does not fall through the slot, or which does not pass through the vertical opening between the two angle plates, strikes against the plates and is curled back on itself. Since these plates are set at an angle to movement of the material stream, the material which is curled back on itself is directed, generally, in the direction of the longitudinal slot. This action may be described as a folding action since the continuously moving streams create the impression that the material, particularly at the upper portion of the inclined plate, is being folded into the slot.
The passage of the materials through the slot, the vibrational forward and spreading-out movement of the material on the trough bottom, and the falling of additional material onto that lying on the trough, results in a good mixing action. As this mixed stream of materials passes beyond the elevated end of the inclined plate, it is subjected to a further mixing and spreading action on its way to the next mixing stage. Here, again, the length of the trough and the number of the mixing stages spaced longitudinally therealong, is determined by the character of the materials to be mixed, their proportions, and the desired degree of homogeneity desired.
A material conveyor-mixer apparatus made as hereindescribed will provide a uniformly-mixed stream of urea particles and dusting clay and discharge such stream at a rate of 5 cubic feet per minute. Such discharge rate can be altered by properly changing the dimensions of the mixing stages or changing the trough vibrating frequency and/or amplitude. The apparatus is of relatively small size, low cost and convenient to move from place to place. The energy required to operate the apparatus is of a small order, a one-half horse power electric motor being suicient to provide the stated 5 cubic feet per minute discharge rate. Importantly, there is a minimum inter-particle attrition and breakage and the apparatus is easy to clean.
Having now described the construction, arrangement and operation of the various components of the conveyormixer, those skilled in this art will be able to make various changes and modifications to meet specific applications and conditions of use. Such changes and modifications can be made Without departing from the spirit and scope of the invention as recited in the following claims.
While the apparatus has been specifically described to effect a mixing of urea particles and clay dusting powder, it will be apparent -that it will operate with any granular or powdered materials having characteristics such that they can be subjected to continuous movement on a vibrating surface. Therefore, in the claims, it is intended that the term particulated materials applies to any and all materials having such characteristic.
1. Apparatus for mixing particulated materials comprising,
(a) an elongated trough adapted to receive the materials at one end,
(b) means vibrating the trough to cause the materials to ow as a continuous, composite stream toward the other end thereof, and
(c) a plurality of at inclined members carried by the trough and spaced from each other along the trough axis, each member having an upstream end in engagement with the trough bottom and a downstream end spaced above the trough bottom.
2. The invention as recited in claim 1, wherein each of the said inclined members has -a width less than that of the trough; and including side walls extending upwardly from the side edges of each inclined member, and a pair of deflecting members associated with each inclined member, said deecting members extending from opposed side walls of the trough to the elevated end of the associated inclined member and having lower side edges in engagement with the trough bottom.
3. The invention as recited in claim 2, wherein the width of each inclined member is substantially equal to one-half that of the trough.
4. The invention as recited in claim 1, wherein each of said inclined members has a longitudinally-extending slot formed therethrough; and including a pair of deiiecting plastic carried by each of the inclined members at the elevated end thereof, each pair of said deilecting plates extending angularly from a side wall of the trough to the proximate wall defining said slot.
5. The invention as recited in claim 4, wherein said slot terminates at a point spaced from the lower end of said plate.
6. The invention as recited in claim 4, wherein the said deecting members lie in planes normal to that of the said plate.
7. The invention as recited in claim 1, wherein the downstream end of each inclined member spans the trough and the upstream end has a length less than the width of the trough.
8. Apparatus comprising,
(a) an elongated, horizontally-disposed trough,
(b) a chamber for receiving particulated material at one end of the trough, said chamber having a discharge opening,
(c) a first U-shaped chute having one end spaced from said discharge opening and abutting the trough bottom and the other end elevated from the trough bottom,
(d) a rst pair of vertical deflecting members disposed on opposite sides of said rst chute, each member having one end abutting the wall of the trough and the other end in engagement with the side wall of the chute at the elevated end thereof,
(e) a second U-shaped chute spaced from the first chute, said second chute having one end abutting the trough bottom at a point spaced from the elevated end of the first chute and the other end elevated from the trough bottom,
(f) a second pair of vertical dellecting members disposed on opposite sides of the second chute, each member having one end abutting the wall of the trough and the other end in engagement with the wall of the chute at the elevated end thereof, and
(g) means vibrating the trough to effect movement of material from said chamber to the other end of the trough.
9. The invention as recited in claim 8, wherein the said chutes have a width substantially equal to one-half that of the trough.
10. The invention as recited in claim 9, wherein all of the said deecting members have side edges abutting the trough bottom and wherein the cross-sectional area of the space under the elevated end of each chute is substantially equal to one-half that of the said discharge opening.
11. Apparatus comprising,
(a) an elongated, horizontally-disposed trough,
(b) a chamber for receiving particulated material, said chamber having a discharge opening presented to the trough bottom,
(c) a rst inclined plate spanning the trough and having a lower end abutting the trough bottom at a point spaced from said discharge opening,
(d) means forming a longitudinal slot on said first inclined plate, which slot extends to the elevated end thereof,
(e) a second inclined plate spanning the trough and having a lower end abutting the trough bottom at a point spaced from the elevated end of the said rst inclined plate,
(f) means forming a longitudinal slot in said second plate, which slot extends to the elevated end thereof, and
(g) means vibrating the trough to effect movement of the material from said chamber toward the rst said inclined plate.
12. The invention as recited in claim 11, wherein the said slots terminate at a point spaced from the lower end of the associated plate, and including a pair of deilecting members carried by each of said inclined plates at the elevated ends thereof, such deecting members being angularly positioned relative to the axis of the associated plate and extending from opposed side walls of the trough to the proximate wall of the associated slot.
13. The invention as recited in claim 12, wherein each pair of said deiiecting members lie in planes normal to that of the associated inclined plate.
References Cited by the Examiner UNITED STATES PATENTS 2,208,077 7/ 1940 Linke 259-72 3,086,008 4/1953 Opila 259--72 2,646,975 7/ 1953 Waldvogel 259-72 WALTER A. SCHEEL, Primary Examiner.
R. W. JENKINS, Assistant Examiner.