Патент USA US2112848код для вставки
~April 5, 193s. R. JACKSON 2,112,848 MIXING AND BLENDING Filed Oct. 22, 1936 - „faund, “ . nE ‘W “iL/QH, 2,112,848 I Patented Apr. 5, 1938 - UNITED STATES PATENT _OFFICE f 2,112,848 " MIXING AND BLENDING v Reginald Jackson, Clayton, Mo.,vassignor to Alu@ minum Company of America, Pittsburgh, Pa., a corporation of Pennsylvania - Appuestion oetober‘zz, 193s, serial No. 107,005 9 Claims. This invention relates to the mixing and blend ing of granular or powdered materials, kand specifically to the mixing and vblending ofsuch materials in large quantities such as, for ex 5 ample, carload lots of l approximately 60,000 (ci, 259-3) Fig. 4 is a section taken on line IV-IV of'Flg. 1, showing a scoop feeder provided with a gate for regulating discharge of the material; ~ y Fig. 5 is a section takenon line V-V of Fig. l, showing the discharger scoop._ .l 5 The apparatusof this invention consists es sentially of an external cylindrical drum, rela together several kinds of -granulariorv powdered tively long in proportion to its diameter, together with an inner cylindrical drum coaxial with the materials of different characteristics sol inti l0 mately, so completely, and so uniformly that every _ outer drum. 'The outer drum may- be equipped 10 sack of the mixture in a carload shipment would with circular tires and supported on fixed rollers, contain identical proportions ofthe several in or the >tires and rollers may take the form of suit gredients and be of identical quality. Modern able gearing.V The particular form of support specifications and mass production manufacture and power mechanism is immaterial, so long as ’ require a, mixing apparatusl capable of obtaining reversible rotation of the unit about its horizontalA 15 and maintaining uniformity throughout a large axis is possible.` Both the outer drum and the quantity of mixed materials. inner cylinder are provided with helical blades, The primary object of the invention is to pro and for the sake of convenience, will be vherein pounds. ., ` , Heretofore it has been diiilcult to blend or mix vide an improved method and apparatus of the character stated which is capable of carrying out a mixing and blending operation with a minimum after referred to as helical “flights". The term ' A further object of the invention is to pro vide a mixer capable of vconveying material in opposite directions at the same time and in which the material as it travels through the apparatus “flight” will be regarded as defining the particular 20 blading in a predetermined section of the ap paratus as, for instance, single helical flight or double helical flight. The inner cylinder is pro vided With several discharger units forv emptying the material from the inner cylinder intothe outer drum. ¿Suitable scoop feed .anddischarge is automatically divided into several predeter units are provided at appropriate places in the mined paths or streams of flow. apparatus for moving- the material being mixed amount of physical labor. , » - A further object of they invention isv the pro from one section of the machinevto another, Aac vision of a process whereby granular or powdered ‘ cording to the direction of rotation of the drum. materials are mixed or blended more completely The outer drum receives` and discharges material in less time than heretofore known. through a single feeding and discharging unit j . A further object of the invention is the pro vision of a method for mixing materials where 35 by several portions of the mass, into which it is divided, are conveyed in _opposite directions, in dividual portions being reintroduced to the mass at spaced intervalsjalong the path traversed by the original mass. 40 yA still further object of the invention is toy provide a rotary conveyor having associated there with means to positively divide the traveling mass into several units and to` direct each such unit along its path of travel. ` , y , r In the accompanying drawing forming a part of this specification, Fig. 1 is aside elevation ofthe assembled apparatus with part oi' the shell broken away, showing a portion Aof the longitudinal con veying mechanism;_ v Fig. 2 is _a section taken on line II-II of. Fig.j1, showing the scoop feeders; ¿ Fig. 3 is a section' taken on line III-_III of Fig. 1, which shows the dual feeding screws, to gether with one of the central tube discharge 55' units; ' which is provided at eitherv end with scoops. The outer drum in its preferred form comprises an elongated casing I which for clarity'and con venience may be regarded as 4being of three sec tions, A, B, and Q. Each of these sections extends approximately for a distance of about ,one-third the length'of the outer drum. kInside of and co axial with the drum is unitarily mounted `a cy-.A 40k , lindrical _tube 2 of alength slightly less than‘that '^ of the outerY drum. Likewise, the inner cylindrical .tube may be regarded as comprising three sec tions, a,.`b, and c. , Rigidly secured to the inner surface` of the outer drum are conveying means . which, in .the preferred form, are flights. of helical blades. In .section A there is provided a single helical flight; in section B, a double helical flight, and in section C, a triple helicalv flight. Within the inner- cylindrical tube and rigidly se cured thereto are similar flights of helical form: section a, having a single helical flight, section b, a double helical flight, and section c, a`triple helical flight. ‘It is to be noted that the ‘.‘hand” of these ñights is opposite to that of >the‘»'hand” 455V . ' ’ 2,112,848 of the nights oftheouter drum, so~ that upon ldirection of rotation of the drum. A gate f -|40 rotation of the drinn, material will be conveyed serves to permit discharge of the blended mate rial at appropriate times. . along the length of the _inner cylinder in a di Inkoperation, the gate Il is closed and the rection opposite to that in which it is traveling along the outer drum. Therefore, whether blend ' material to be mixed or blended fed into the 5 ing or discharging, material is being moved in supply hopper Ii. The drum is rotated in a di rection (counter-clockwise looking `at Fig. 2) such that the material isvpickl'ed up by the external same time, but in opposite directions. « A charge or batch of material entering the inlet y,scoop feeder and delivered to the inside of the ¿end of the mixer is conveyed along -the outer drum. As the material travels through the drum, drum from .left to‘rlght (Fig. 1) bythe helical it is successively dividedìinto separatestreams both the outer drum and inner cylinder at the ~ nights secured to the inner surface ,of the outer and kcontinues its travel- until it contacts the three scoop feeders at the right-hand end ofthe ’ drum. While passing through section A of the drum, the material may> belregard'ed' as. being machine. Herve each stream is denected 4'into its moved in a single “stream". Upon reaching sec# own separate space which is established bythe tion B, the double helical nights of blades in .that . triple helical nights within section c of the inner section divide 'the single “stream” into two ."streams" of material and `likewise the double “stream" passing from section B to sectionC is »divided into three “streams”, due to the triple v>helical nights ofthe latter section. Hence, what ’ pwas la' single “stream” of advancing material in >`section A is nowa triple “stream" in section C. At the extremeright-hand end of thev mixer and enclosed within the end of the drum are three'scoop feeders-3. These scoops are of the same hand and are disposed in such a, manner that eachscoop'picks up material which is be cylindrical tube. . The direction of travel of the > material is now reversed, and as the material progresses from section to section through the inner cylindrical tube, the streams of material 20 successively decrease in number. 'I'he discharger >units mounted on the inner tube serve to each discharge one stream of material and returnV the same to the outside drum. ' After the "desired ëmixing and lblending has 25 taken place and the machine is to be discharged, the direction' of rotatior` n! the drum is reversed. Upon reversal, the material in the drum outside ing conveyed along the outer drum by the triple helical nights and deposits it into the inner cy the central tube then yis moved toward the left hand or .feed-end of the machine, where the dis l‘ndrical' tube 2. charger inside the feed end will serve as a pick Within- section c of the inner - helical nights of blading of a hand oppositeto upr scoop. 'I'he helical night in the feed-and discharge unit, together with the external scoop, the hand of the nights of the outer drum. Ma will now operate to convey material out of the cylindrical tube, the conveying meansare triple 30 terial which has been picked up'byv the scoop feed-v drum into the hopper, where it is discharged for crs 3is delivered to one in particular of the three delivery. 'I'he result of this action is a uniform and ei' spacesbetweenthe three distinct and separate sets of- helical nights and is conveyed from right ficient blending. I have been able to blend,_ in to left in three “streams” for a distance of ap 40 proximately one-thirdl the> >length of 'the inner cylindrical tube. ' ì l. Mounted on the central tube between sections a, b, and c are discharging means 4 (see Figs. 1 and 3) _' These dischargers’are so arranged that 45 each one 'discharges material from only one of the spaces established by the helical nights within the practical operation of a large machine', vari ous sizes, kinds and quantities of material which may be charged to the drum> invany desired se quence and in any desired proportions. ` I claim: ~ ` ' ` 1. In a mixing and blending machine, an outer revoluble drum, a unitarily mounted inner cyl 45 inde'r, helical conveyors disposedY within said drum and cylinder for feeding material in oppo „ the inner cylindrical tube. The material is emp tied into the outer drum, where> it again resumes site directions, means for feeding material from ` its travel toward the right-hand end of the said outer drum into said inner‘rcylinder and ak plurality of discharging means spaced axially on 50 50 drum. After one "stream” of material is emp tied into the outerdrum by the discharger be -said inner cylinder for discharging material from tween sections b and c, the> remaining double said inner cylinder to said outer drum. 2. In a mixing and blending machine, an outer “stream” continues on through' section b until reaching the discharger between'sections a and revoluble drum, a unitarily mounted inner drum, 55 b. Here,` another* “stream” is deflected into the yhelical feeding conveyors yrigidly secured to the 55 outer drum and4 the single remaining “stream” inner surfaces of said‘drums for progressively 4'permitted Vto pass along section> a where, upon feeding material in opposite directions simulta neously, means ' fory feeding 'material from ~ said rreaching the last discharger, itylikewise is emp tiedy into thef'outer drum. ' v vAt the left-hand end of the machine -there is located a feeding and discharging unit A5. A relatively small feed-and-discha'rge neck 6 is pro vided on the axis ‘of the drum.` Atpeithe'r end outer drum into said inner drum and a plurality of axially spaced discharging means on said in 80 ner drum 'for discharging material from said in ner dmm to said- outer drum. ` 1 3. YIn a mixing and blending machine, unitarily ' mounted revoluble inner and outer drums, means 'rigidly secured to the'interior of said drums for 65 feeding material through said drums simulta cate 8’ is mounted on'the scoop 8.- These scoop neously in oppositedirections, means for feed >of this neck are scoop'feeders 'I and 8,» one be 65 ing located outside thev drum, the -other vwithin ‘ the head of the drum. A discharge regulating feeders are of yopposite handjso that when ro tation >of the drum is such that the external 70 feeder 1 is picking up material, the internal scoop feeder 8 will discharge material intothe drum. The conveying element vof the unit 'Q is a single helical screw, and affords appropriate movement -of the material from the external feeder into the 75A internal feeder or vice versa, according to the ing material from said outer drum into said inner drum and a plurality of axially'spaced discharg ing means Vmounted on said inner drum for 'dis-’ charging material from said inner to said outerl drum whereby the travel of said discharged ma terial is reversed. ` ì ì y ' . 4. In a mixing and blending machine, inner and outer co-axlal revoluble drums, each having 2,1 12,848 helical conveyors rigidly mounted on their inner surfaces, the outer conveyor comprising nights which progressively increase in number at pref determined points from the supply end toward the discharge end of the outer drum, the inner conveyor comprising nights which progressively decrease in number at pre-determined points from the supply end toward the discharge end of the inner drum, means for feeding material 10 from said outer drum into said inner drum and means for discharging material from said inner drum to said outer drum. 5. In a mixing and blending machine, uni tarily mounted revoluble inner and outer drums, conveying means rigidly secured to the inner sur faces of said drums for simultaneously feeding material through said drums in opposite direc tions, said conveying means comprising progres sively increasing and decreasing sectional flights from the supply ends of said drums, respectively, and means axially mounted on said inner drum at the points of decrease of the nights for dis charging material from said inner to said outer drum. 6. In a mixing and blending machine, unitarily mounted revoluble inner and outer drums, con veying means rigidly mounted on the interior surfaces of said drums to progressively move ma terial in said drums in opposite directions at the same time, said conveying means comprising a plurality of sectional progressively increasing and decreasing flights of blading, means for feeding material from said outer drum’into said inner drum and means axially mounted on said inner drum at the points of decrease of the nights for discharging material from said inner to said 3 outer drum, thereby reversing the direction of movement of the discharged material. '7. The method of mixing and blending granu lar material which comprises conveying said ma terial in one direction, dividing said material at _certain points of its travel into an increasing 5 number of portions, reversing the direction of travel of each said portion, successively decreas ing the number of portions - at predetermined points during the Yreversed movement, and caus 10 ing each said reversed portion to be positively fed in the direction of its initial movement. 8. The method of mixing and blending granu lar material which comprises dividing said ma terial into an increasing number of portions successively during the initial forward movement of said material, reversing the direction of now of all of said portions, and decreasing the num ber of said reversed portions successively at pre determined points of its travel by causing one of said reversed portions to unite with other mate rial and be fed in the direction of said initial movement at each of said pre-determined points. 9. The method of mixing and blending granu lar material which comprises dividing an orig- ‘ inal stream of material into an increasing num ber of streams successively during the initial for ward movement -of said material, reversing the direction of now of all of said streams, and de- » creasing the number of said reversed streams suc 30 cessively at pre-determined points of its travel by causing one of said reversed streams to unite with said original stream and be fed in the di rection of said initial movement at each of said pre-determined points. ' REGINALD JACKSON.