EP0073193A1 - Introduction d'un materiau granulaire dans un courant de gaz - Google Patents

Introduction d'un materiau granulaire dans un courant de gaz

Info

Publication number
EP0073193A1
EP0073193A1 EP19810902262 EP81902262A EP0073193A1 EP 0073193 A1 EP0073193 A1 EP 0073193A1 EP 19810902262 EP19810902262 EP 19810902262 EP 81902262 A EP81902262 A EP 81902262A EP 0073193 A1 EP0073193 A1 EP 0073193A1
Authority
EP
European Patent Office
Prior art keywords
granular material
nip
rollers
duct
restriction
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP19810902262
Other languages
German (de)
English (en)
Inventor
Austin Timothy Ryan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
RYAN Austin T
Original Assignee
RYAN Austin T
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US06/239,707 external-priority patent/US4453866A/en
Application filed by RYAN Austin T filed Critical RYAN Austin T
Publication of EP0073193A1 publication Critical patent/EP0073193A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01C—PLANTING; SOWING; FERTILISING
    • A01C7/00—Sowing
    • A01C7/08—Broadcast seeders; Seeders depositing seeds in rows
    • A01C7/081—Seeders depositing seeds in rows using pneumatic means
    • A01C7/084—Pneumatic distribution heads for seeders
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01C—PLANTING; SOWING; FERTILISING
    • A01C15/00—Fertiliser distributors
    • A01C15/04—Fertiliser distributors using blowers

Definitions

  • This invention relates, in one aspect, to the feeding of granular material into a gas stream and in such aspect has particular, though by no means exclusive, application to the feeding of grain or fertilizer into an airstream of a seeder or broadcaster.
  • the invention relates to the distribution of granular material borne by a single gas stream into several separated streams.
  • the entrainment of seed into airstreams for distribution to the sowing tines of a tractor-drawn seeder has proven less than wholly successful with lighter-weight seed, such as that of clover.
  • lighter-weight seed such as that of clover.
  • the high speed airstream tends to oppose successful entrainment of seed and, indeed, diversion of air into the seed stream prior to entrainment is not unknown.
  • One such proposal is to pressurise the seed bin; another is to employ a rotary airlock valve to control seed supply to the airstream.
  • the invention provides, in one aspect, apparatus for feeding granular material into a gas stream, comprising:- a receptacle for granular material; a duct for constraining a gas stream; a pair of resiliently compressible surfaces which contact or almost contact to define a nip between them, the surfaces being disposed so that granular material may pass from one side of the nip through a port into said duct and being moveable into the nip from the other side thereof; and metering means defining a controllable outlet from said receptacle and being positioned with respect to said nip for feeding granular material into said nip from said other side thereof at an adjustable controlled rate.
  • said duct is one of a plurality of ducts with associated parts arranged side by side
  • said metering means comprises structure defining an array of multiple primary openings from said receptacle, which openings and ports are in register having regard to the direction of flow of granular material to the ducts in use of the apparatus .
  • the metering means may further include, a shutter mounted for sliding movement with respect to said openings to simultaneously vary their effective size, and control means to effect said movement of the shutter.
  • said apparatus further includes, between said metering means and said nip, a partition which is formed with a plurality of parallel slots in register with said primary openings and said ports having regard to said direction of flow of granular material to the ducts in use of the apparatus.
  • the or each duct preferably includes venturi means for introducing additional gas into the duct.
  • the resiliently compressible surfaces advantageously comprise the cylindrical surfaces of a pair of rollers which touch to form said nip and may be roughened to enhance engagement with the granular material.
  • the seed and/ or fertiliser is entrained in primary air streams of a wideline seeder/broadcaster the seed is carried by the primary streams to respective secondary distributors for conveyance to a multiplicity of delivery tubes or feet arranged adjacent the ground and often close behind respective cultivator tines. It is imperative that the distribution be on a uniform basis if uneven sowing of a crop is to be avoided.
  • a distributor especially adaptable to distribution of gas entrained granular material into a plurality of individual gas streams, comprising:- a transversely closed housing defining a passageway which widens gradually in a lengthwise direction from one end of the passageway to another, elongate , end ; a restriction in said passageway intermediate said ends, whereby the cross-section of the passageway at the restriction is elongate in a direction substantially parallel to the elongate dimension of said other end and, in this direction, converges from each of its extremities to a minimum height at its centre; and one or more inclined surfaces disposed in said passageway to deflect the bulk of gas-entrained granular material entering at said one end, through said restriction such that the flows to either side of said centre of the restriction are substantially identical.
  • FIG. 1 is a somewhat schematic, partly sectioned, side elevational view of an agricultural wideline seeder/broadcaster assembled from a feed unit and distributors in accordance with the different aspects of the invention
  • Figure 2 is a plan view of the assembly shown in Figure 1;
  • Figure 3 is. a partial cross-section on the line 3-3 in Figure 2, and depicts details of the feed unit forming part of the assembly of Figure 1;
  • Figure 4 is a partial cross-section on the line 4-4 in Figure 3;
  • Figure 5 is an exploded perspective view of the principal elements visible in Figure 3;
  • Figure 6 is a plan view of a first embodiment of distributor for the assembly depicted in Figure 1 with the cover removed;
  • Figure 7 is a cross-section on the line 7 - 7 in Figure 6.
  • Figures 8 and 9 are respectively perspective and plan views of a second embodiment of districutor, shown with its cover removed;
  • Figures 10 and 11 are respective cross-sections on the lines 10 - 10 and 11-11 in Figures 9 and 10.
  • the seeder/broadcaster 1 illustrated in the drawings includes, as separate wheeled implements, a feed unit 11 and a rearward wideline frame 13.
  • unit 11 has a chassis 12 fitted with a pair of rear ground wheels 14 and with a forward hitch 16.
  • An airline 18 comprises a plurality of side-by-side closed tubes 18a (eight as illustrated and typically between six and twelve) projecting rearwardly atop the chassis from a tapered manifold 19 to which air is supplied by a forwardly mounted blower 22.
  • Blower 22 is coupled by a belt drive to an overhead motor 21 and is connected to manifold 19 to develop in tubes 18a equal, rearwardly moving primary airstrearns which are injected into respective larger ducts 20. In use of the assembly these streams receive seed and/or fertiliser by way of a feed device 30.
  • ducts 20 terminate at discrete nipples 24 which detachedly mount individual flexible conduits 26. These conduits convey the primary seed-bearing airstreams to respective secondary distributors 70. From here, uniform secondary streams of seed-laden air, in this case seven Streams per distributor, are conveyed along small diameter conduits 72 which terminate as delivery tubes or feet 74 immediately adjacent respective cultivation tines 76.
  • Distributors 70 are fixed to rearward frame 13 atop individual supports (not shown) spaced across the frame, while tines 76 are suspended in offset rows from chassis 13, being typically biased downwardly by heavy coil springs (not shown).
  • Frame 13 includes ground wheels 79 and draughting means comprising draw bars 78 and ties 78a which merge at a forward tractor hitch 79a.
  • Unit 11 is hitched to frame 13 via hitch 16 and is so dimensioned that it is located above draw bars 78 with its ground wheels 14 between bars 78 and ties 78a.
  • a seed/fertiliser bin 28 Mounted atop chassis 12.on a generally rectangular stand 27 having end legs 27a and lengthwise joists 27b, is a seed/fertiliser bin 28 with forward and rearward storage compartments 28a, 28b, ( Figure 3) separated by an internal partition (not shown).
  • Feed device 30 is disposed between the lower outlet of this bin and the ducts 20 for mixing the contents of compartments 28a, 28b if necessary and thenfeeding seed and/or fertiliser, in accordance with the invention, from bin 28 into the airstreams within ducts 20.
  • Device 30 includes ( Figure 3) a pair of oppositely rotatable rollers 32 each having an annular surface layer 33 of a resiliently compressible material, which may conveniently be plastics foam, foam rubber, insert rubber or the like. Rollers 32 are mounted within a close fitting casing 36 on axles 38 so that the plane containing the axles is horizontal. The rollers are so spaced that their cylindrical surfaces 34 just touch to define a nip 40 which receives seed/fertiliser falling from compartments 28a, 28b (by means to be hereinafter described!
  • rollers 32 are arranged to be oppositely rotated so as to move surfaces 34 into nip 40 from above, at a speed in direct proportion to the speed of ground wheels 14.
  • This is achieved by a drive consisting of a small rear wheel 58 ( Figure 2, omitted from Figure 11 supported by chassis 12 in friction driveable contact with one of ground wheels 14, and a chain 60 C Figure 1 and 4) transmitting ground speed directly to the nearer roller 32 vial sprocket 61 C Figure 41 and oppositely to the further roller.
  • the moving surfaces 34 thereby pick up the seed/ fertiliser and pass it through the nip 40 towards port 51, at a rate proportional to ground speed.
  • Casing 36 is fixedly suspended from bin 28. It comprises end walls 42 Cone visible in Figure 4 ⁇ and respective front and back walls 44, 45 ( Figure 3) which are both lined with rubber 44a, 45a in light contact with the surfaces 34 of their respective nearest roller. Walls 42 may also be rubber-lined if necessary, in contact with the ends of the rollers.
  • Attached to the underside of casing 36 is a housing 46 of triangular configuration. The attachment is depicted in Figure 3 as a screw or rivet fastening to walls 44, 45, but it is preferable that the two parts be readily separable to permit cleaning and servicing of the device.
  • housing 46 might hook onto wall 44 at one side and be clamped into place at the other.
  • Housing 46 encloses chamber 47 and includes a pair of inclined walls 48, 48a which converge away from nip 40 to an apex ridge 48b. Ducts 20 open into chamber 47 at apex ridge 48a to define a linear array of ports 52. It will be noted that forward inclined wall 48 is contiguous with the lower edges of ducts 20 so that the axes of ducts 20 are inclined, at about 45o, to the direction of flow of the granular material from nip 40.
  • One end wall, 50a, of housing 46 is welded to walls 48, 48a, but the other, 50b, is integral with a removable unit 49 which provides baffles 51a to divide chamber 47 into respective feed cavities 47a for ports 52. Baffles 51a and end wall 50b are fixed to a V- section slide 43 complementary to housing 46: end wall 50b may be detachably fastened to walls 48, 48a to hold baffle unit 49 in place, and yet permit its ready removal for cleaning or inspection.
  • Tubes 18a terminate at nozzles 18b which form restrictions at bends 20a in ducts 20. This provides respective venturi means at 17 by which air injected from nozzles 18b draws further air through apertures 17a in housing wall 48. Such is found to be very effective in entraining granules falling from nip 40 while minimising back pressure and turbulence.
  • Each tube 18a is co-axial with the associated duct 20 downstream of nozzle 18b.
  • slanted end walls, 37, 39 of bin 28 converge downwardly inwardly towards respective metering means 50, 51 defining outlets from compartments 28a, 28b and positioned with respect to nip 40 for feeding granular material into the nip at an adjustable controlled rate.
  • the centre partition of bin 28 is bifurcated at its lower end to form spaced vertical wall segments 53, 55 above the respective rollers 32. Segments 53, 55 respectively mount metering means 50, 51.
  • Wall segments 53, 55 are notched to form linear arrays of rectangular openings 84 (eight per array as illustrated) in vertical register with ducts
  • ports 52 and cavities 47 having regard to the direction of flow of granular material to ports 52.
  • vertical register is meant that granular material falling from an opening 84 will fall directly to a matching port 52 and duct 20 through a respective cavity 47.
  • the other sides of openings 84 are closed by a flexible mat 80 that rests on and conforms to the uppermost portion of roller surfaces 34.
  • Mat 80 is fastened to walls 44, 45 of casing 36 by linear brackets 81 and sags towards nip 40 between the rollers. This sagged portion is formed with slots 82 in vertical register with openings 84 and ports 52, and of similar breadth to openings 84. It will be noted that mat 80 forms the lowermost wali of the bin and seals of casing 36 to the outside of rollers 32.
  • each metering means 50, 51 are controlled by a pair of shutters 86, 88.
  • Crossshutter 86 is slidable, by rotation of an external nut on a threaded stud 87 welded to the shutter, across the inside of the openings 84 and defines a further array of openings 90 which match openings 84 in dimensions and placement.
  • shutter 86 may be employed as a slidable screening device to vary the effective width of the individual openings 84 according to the desired sizes of the granules to be sown or broadcast.
  • Shutters 88 are of simple rectangular form and are slidable up and down (in tracks not shown) on the outside of wall segments 53, 55 to vary the effective vertical height of apertures 84 and accordingly the rate at which the contents of the respective bin compartment are fed to the nip 40.
  • the mechanisms for adjusting shutters 88 include rotatable levers 92 accessible at the outside of one of casing end walls 42.
  • Each lever 92 includes a spindle 94 which fixedly carries a transversely protruding bifurcated lug 96 ( Figure 3). Lug 96 engages a pin 98 on shutter 88 so that rotation of each lever 92 effects vertical sliding movement of the associated shutter.
  • a graduated scale is marked on a cover plate 98 ( Figures 1 and 4) depending from bin 28: the lever may be clamped at any selected position on the scale.
  • each compartment of the bin Disposed above the metering means 50, 51 in each compartment of the bin are respective rectangular plates 89 which are hinged at 89a to wall segments 53, 55 and supported in an inclined position as shown ( Figure 3) by chains 91.
  • these plates bear a substantial portion of the weight of granular material in the bin, while leaving sufficient clearance for the material to pass to the metering means.
  • the chains are suspended at the top of the bin and may be released for dropping the plates to inspect the area below them.
  • Baffles 51a may be extended upwardly to define curved edges in close proximity to rollers 32. This modification might prove necessary in some cases to prevent turbulent conveyance of individual granules, especially small granules, to ducts other than those immediately below the granules' points of exit from nip 40.
  • roller surfaces 34 are roughened, such as by elongate ribbing or by mulitiple fine nodules, preferably peaked.
  • the ribbing advantageously exhibits a uniform zig-zag triangular crosssection and preferably extends parallel to the roller axes.
  • Barley grain in particular, is occasionally whiskered, in which case it may lodge in and block an opening through shutters 86, 88.
  • Ribbing on rollers 32 assists in disloging such granules, generally enhances uniformity of flow and is found especially useful in improving the accuracy of precision planting of grain such as sorghum and sunflower.
  • a horizontal shutter to slide over partition 80 and under wall segments 53, 55 to act as a lock gate for the bin when unit 11 is transported or stored with seed or fertilizer in the bin.
  • the illustrated assembly is drawn behind a tractor over the land to be sown.
  • Blower 22 is activated by motor 21 to fill manifold 19 and the motion of ground wheels 14 translated into mutually opposite rotation of rollers 32.
  • Shutters 86, 88 are moved to control the rates of feed of the seed and/or
  • the contact of surfaces 34 at nip 40 prevents both diversion of air into the seed stream and reversed travel of lighter seeds, such as clover, away from the airstream by turbulence.
  • the contact between the roller surfaces and both the walls 44, 45 of casing 36 and the mat 80 minimizes travel of air about the rollers to the vicinity of openings 50 and the supply side of the nip.
  • the provision of metering means 50, 51 in advance of the nip ensures even flow without clogging or bridging.
  • the presence of openings 84 and slots 82, and their vertical registration with cavities 47a and ports 52, is believed to assist in obtaining a uniform distribution of granules across all of the ducts 20.
  • Each distributor includes a transversely closed metal housing 102 defining a passageway 104 which widens gradually and uniformly with an included angle between 30 and 40 from a forward, substantially square intake port 106 to a rearward, transversely elongate, arcuate exhaust end of transverse dimension about 3.3. times the diameter of port 106.
  • Housing 102 comprises diverging side walls
  • the respective supply conduit 26 is coupled to the intake port 106 by a round-to-square adapter piece 100 which is clamped onto the conduit and fastened about port 106.
  • the individual conduits 72 feeding the delivery tubes 74 carry square metal spigots 107 and these are welded in a row into the exhaust end to define respective exhaust ports 108 from passageway 104.
  • Located within housing 102 is means defining a conical obstruction 112 in passageway 104 intermediate ports 106, 108.
  • the base rim 114 of this cone rests on and is welded to the inner surface of base wall 102c while its apex 116 is spaced from cover 102d by a clearance 118 which is small relative to the height of the cone.
  • the cone axis lies in a plane which is normal to the direction of divergence of the housing and to the elongate dimension of exhaust port 108.
  • the axis is also somewhat closer to intake port 06 than to exhaust poris 108. If convenient, the cone may be fixed to the underside of cover l ⁇ 2d rather than to base wall 102c.
  • conical obstruction 112 defines a restriction in passageway 104.
  • the crosssection of the passageway at the restriction is elongate in a direction parallel to the elongate dimension of exhaust port 108 and, in this direction, converges from each, of its extremities to a minimum height at appex 116.
  • Obstruction 112 further defines a lead-in surface to deflect the bulk of gas entrained material entering at said one end, through the restriction such that the flows to either side of apex 116 are substantially identical.
  • Distributors constructed in this manner are found to ensure a very even distribution of seed borne by the primary airstream in conduit 26 among the secondary airstreams in conduits 72.
  • the direction of seed flow about the conical surface of obstruction 102 generally normal to the axis of the cone rather than onto the conical surface parallel to this axis appears at present to be the effective operational feature.
  • the conical surface need not be complete but may be part-conical, or indeed inverted conical. There may be more than one such surfaces, which may be supported from the cover rather than from the base wall of the housing.
  • the conical obstruction 112 is supplanted by a pair of plates 140, 150 disposed in, and extend transversely of passageway 104'. Both plates are welded to side walls 102'a, 102'b. The plates are of approximately equal extent in, and are inclined to, the general direction of air flow through the passageway. Downstream plate 140 serves to define a restriction 142 in passageway 104' and a primary deflecting surface ⁇ 44 ( Figure 10) to deflect entering granular material through restriction 142.
  • the plate is slightly bent along two oblique fold lines 146a, 146b to give rise ( Figures 8 and 11) to a straight upstream edge 147 extending parallel to base wall 102'c, and a shallow-V upstream edge 148 defining restriction 142.
  • the cross-section of the passageway at the restriction is thereby elongate in a direction parallel to the elongate dimension of the exhaust end and, in this direction, converges from each of its extremities to a minimum height at the nadir 149 of plate 140 at the centre of the restriction.
  • Deflecting surface 144 is somewhat complex and essentially part-conical in three flats. The arrangement is symmetrical, so as to achieve substantially identical flows to either side of nadir 149.
  • Upstream plate 150 is flat and defines a further deflecting surface 152 effective to direct the bulk of the entering gas-entrained granular material towards the upstream region of surface 144, displaced from restriction 142.
  • the granular material approaches the surface 144, the primary deflecting surface, as a band extending across the passageway; this motion is indicated by arrows 160 in Figure 10 : the granular material is deflected first by a surface, typically a top surface, of plate 150, and then by an undersurface of the second-encountered plate 140.
  • angles of inclination of surfaces 144, 152 to an imaginary line 162 ( Figure 10) joining the centres of the intake end and the exhaust end are preferably in the respective ranges 15° to 40° and 5° to 25°, most preferably about 25° and 15°.
  • upstream margin 154 of surface 152 is closely adjacent intake port 106' while, along line 162, the upstream edge 147 of plate 140 is spaced from the downstream edge 156 of plate 150 by a distance a little less than half the extent of each plate.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Soil Sciences (AREA)
  • Environmental Sciences (AREA)
  • Sowing (AREA)
  • Fertilizing (AREA)

Abstract

Dispositif permettant l'introduction d'un materiau granulaire dans un courant de gaz, par exemple des semences ou un fertilisant dans les courants d'air multiples d'un engin agricole, comprenant un reservoir (28) pour le materiau granulaire, une conduite (26) pour un courant de gaz, et une paire de surfaces (33) comprimables de maniere elastique qui sont en contact ou presque pour definir une ligne de pincement (40). Les surfaces (33) peuvent etre pourvues de rouleaux (32) tournant en sens inverse et sont disposees de maniere telle que le materiau granulaire puisse passer d'un cote de la ligne de pincement (40) au travers d'un orifice (52) dans la conduite (26), et sont mobiles dans la ligne de pincement (40) de l'autre cote. Le dispositif comprend en outre des moyens de reglage (50, 51) definissant une sortie reglable depuis le reservoir (28) et positionnes par rapport a la ligne de pincement (40) de maniere a permettre l'introduction d'un materiau granulaire dans la ligne de pincement (40) depuis l'autre cote a une vitesse commandee reglable. On decrit aussi un distributeur (70) pour le materiau granulaire entraine par le gaz, comprenant dans un boitier divergent (102) un limiteur (118, 141) qui converge transversalement par rapport au boitier (102) vers sa ligne centrale, ainsi qu'une ou plusieurs surfaces inclinees (112, 144, 152) servant a devier le materiau granulaire symetriquement au travers de l'etranglement (118, 141).
EP19810902262 1981-03-02 1981-08-14 Introduction d'un materiau granulaire dans un courant de gaz Withdrawn EP0073193A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US06/239,707 US4453866A (en) 1980-03-03 1981-03-02 Feeding granular material into a gas stream
AU810481 1981-03-23
AU8104/81 1981-03-23
US239707 1988-09-02

Publications (1)

Publication Number Publication Date
EP0073193A1 true EP0073193A1 (fr) 1983-03-09

Family

ID=25612747

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19810902262 Withdrawn EP0073193A1 (fr) 1981-03-02 1981-08-14 Introduction d'un materiau granulaire dans un courant de gaz

Country Status (2)

Country Link
EP (1) EP0073193A1 (fr)
WO (1) WO1982002994A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4562968A (en) * 1984-03-19 1986-01-07 Dry Sprayer, Inc. Pneumatic spreader
DE4239490A1 (de) * 1992-11-25 1994-05-26 Hassia Maschf Gmbh Pneumatische Maschine zum Ausbringen von Saatgut oder Dünger

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US3189230A (en) * 1962-03-20 1965-06-15 Robert V Gillespie Seeding device
FR1498719A (fr) * 1966-10-06 1967-10-20 Machine épandeuse par centrifugation plus particulièrement destinée à des travaux agricoles
SU368825A1 (ru) * 1970-01-19 1973-02-08 Кировоградский институт сельскохоз йственного машиностроени , Головное специализированное конструкторское бюро почвообрабатывающим , посевным машинам УСТРОЙСТВО дл ПОВЕРХНОСТНОГО РАССЕВА СЫПУЧИХ МАТЕРИАЛОВ К ПНЕВМАТИЧЕСКИМ СЕЯЛКАМ
GB1435097A (en) * 1972-05-12 1976-05-12 Ici Ltd Seed sowing apparatus
DD105705A1 (fr) * 1973-09-19 1974-05-12 Wtz Landtechnik
SU515489A2 (ru) * 1974-04-19 1976-05-30 Всесоюзный научно-исследовательский институт механизации сельского хозяйства Пневмоцентробежный туковысевающий аппарат
CA1012576A (en) * 1974-05-25 1977-06-21 Heinz Dreyer Machine for distributing seeds and spreadable fertilizers
SU571212A1 (ru) * 1975-12-09 1977-09-05 Белорусская Ордена Трудового Красного Знамени Сельскохозяйственная Академия Распределительное устройство дл супычих материалов
US4280419A (en) * 1977-03-21 1981-07-28 International Harvester Company Pneumatic system for conveying granular material
AU3645878A (en) * 1977-05-30 1979-11-29 Meehan P A Fertiliser/seed distributor
SU643109A2 (ru) * 1977-09-28 1979-01-25 Белорусская Ордена Трудового Красного Знамени Сельскохозяйственная Академия Распределительное устройство дл сыпучих материалов
SU718037A1 (ru) * 1978-08-15 1980-02-29 Головное Специализированное Конструкторское Бюро По Посевным И Комбинированным Машинам Высевающий аппарат
SU719527A1 (ru) * 1978-09-25 1980-03-05 Научно-исследовательский и проектно-технологический институт механизации и электрификации сельского хозяйства Нечерноземной зоны РСФСР Распределительна головка пневматической се лки

Non-Patent Citations (1)

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Title
See references of WO8202994A1 *

Also Published As

Publication number Publication date
WO1982002994A1 (fr) 1982-09-16

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