US3794388A - Method and arrangement for conveying particulate material from a lower level to an upper level - Google Patents

Method and arrangement for conveying particulate material from a lower level to an upper level Download PDF

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Publication number
US3794388A
US3794388A US00178655A US3794388DA US3794388A US 3794388 A US3794388 A US 3794388A US 00178655 A US00178655 A US 00178655A US 3794388D A US3794388D A US 3794388DA US 3794388 A US3794388 A US 3794388A
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United States
Prior art keywords
grit
suction
arrangement
container
tubular portion
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Expired - Lifetime
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US00178655A
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English (en)
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M Westenberg
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Individual
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Individual
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Priority claimed from DE19702045317 external-priority patent/DE2045317A1/de
Priority claimed from DE19712116462 external-priority patent/DE2116462C3/de
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
    • B65G53/34—Details
    • B65G53/60—Devices for separating the materials from propellant gas
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
    • B65G53/04—Conveying materials in bulk pneumatically through pipes or tubes; Air slides
    • B65G53/24—Gas suction systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
    • B65G53/34—Details
    • B65G53/40—Feeding or discharging devices
    • B65G53/42—Nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
    • B65G53/34—Details
    • B65G53/52—Adaptations of pipes or tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G2812/00—Indexing codes relating to the kind or type of conveyors
    • B65G2812/16—Pneumatic conveyors
    • B65G2812/1608—Pneumatic conveyors for bulk material
    • B65G2812/1675—Pneumatic conveyors for bulk material in which materials continuously flow from suction to pressure pipes
    • B65G2812/1683—Pneumatic conveyors for bulk material in which materials continuously flow from suction to pressure pipes without passing through the air-pressure generator

Definitions

  • the present invention relates generally to the conveying of particulate material, and more particularly to the conveying of particulate material from a lower level to an upper level. Still more particularly the invention relates to the removal of grit used in blast-scouring of the interior of a tank or compartment in a marine vessel, to the level of an upper deck above the compartment.
  • Tanks or compartments in marine vessels, especially in tankers, must be cleaned at regular intervals. This is well known and it is also known that conventionally such cleaning is carried out by a blast-scouring method, analogous to sand-blasting but using grit particles of crystalline sharp-edged configuration which are relatively heavy, having a specific weight on the order of 2.2-2.6. Of course, such particles accumulate on the bottom of the tank during the scouring operation, and
  • a further object of the invention is to provide an arrangement for affording the removal of such grit particles, which arrangement also overcomes the disadvantages of the prior art.
  • a concomitant object of the invention is to provide for the simple, rapid and reliable removal of the grit, not only in small or conventional tankers but also in large or very large tankers having tall or very tall tanks, and to afford such removal in an economical manner.
  • one feature of the invention resides in a method of conveying particulate material from a lower level within a compartment aboard ship to an upper level on a deck above such compartment, which method comprises, briefly stated, the steps of raising the particulate material by suction above the lower level by afraction of the distance between the lower and upper levels, to an intermediate level where it is entrained and conveyed by pneumatic pressure to the upper level. At the upper level the thus-conveyed material is recovered by separating it from the entraining air stream.
  • the suction required for initially entraining the grit at the bottom of the tank need only be such as to lift the grit a relatively small distance
  • the mobile separator and recovery unit with a suction conduit which can be inserted into the tank through the manhole thereof, and whose lower open end is surroundedby a substantially frustoconical ring whose largest diameter faces upwardly, which ring is in turn surrounded by a substantially cylindrical ring concentric therewith and whose lower edge defines with the upper edge of the frustoconical ring an air gap so that air drawn into the inlet of the suction conduit must at least in part pass through this annular air gap, thereby assuring that a relatively small volume of air is capable of properly entraining the gritand conveying it to the unit on the deck of the ship even over substantial heights.
  • a currently preferred construction provides for the upper open end portion of the suction conduit to be connected with a spherical container which can be placed on the deck of the ship, by means of a swivel joint which is air tight, and with a connecting nipple being provided which connects the container with a conduit leading to the separating and recovery unit.
  • FIG. 1 is a diagrammatic vertical cross-section through a vessel provided with an embodiment according to the present invention
  • FIG. 2 is a diagrammatic detail view illustrating details of the embodiment according to FIG. 1;
  • FIG. 3 is a diagrammatic longitudinal section through a further embodiment of the invention.
  • FIG. 4 is a diagrammatic side-elevational view embodiment of FIG. 3.
  • reference numeral identifies diagrammatically a tanker vessel which is shown in crosssection.
  • the wall 12 defining a tank of the tanker vessel is here also illustrated as simultaneously constituting the hull plating, although this is not always the case. In any case this if of no consequence for an understanding of the present invention.
  • Reference numeral 14 identifies the deck of the vessel above the tank, and the bottom of the tank and of the hull is identified with reference numeral 17.
  • Each tank will be provided with a manhole 15 through which access may be had from the tank to the deck, and which according to applicable standards must have a minimum diameter of 550 mm.
  • the arrangement of this embodiment utilizes a separator and recovery station 18 where the grit is separated and dust removed from the entraining medium; this station 18 can be placed on the deck 14 and is mobile so that it can be moved from manhole to manhole.
  • a bottle or cylindrical unit 20 which can be lowered through the manhole 15, being so dimensioned that its maximum diameter is at least slightly smaller than the diameter of the manhole.
  • a pneumatic suction conveying device 24 which is connected with a suction conduit 21 by means of which an operator 22 shown in FIG. 1 picks up the grit 16 in the same manner in which a vacuum cleaner picks up particles.
  • the entrained grit which is picked up by an air current supplied via a conduit from the station 18, is separated from this air current.
  • the lower part of the unit 20 is provided with a pneumatic-pressure conveying device 26 which receives compressed air entering through the manhole 15; the device 26 entrains the grit separated from the suction air in the upper portion 24 of the unit 20 and conveys it under pressure through a conduit 27 up through the manhole 15 and to the station 18 where the grit is separated from the entraining air and is supplied via a conduit 28provided with a closure valve 29into a reservoir which is here illustrated as a separate barge or the like.
  • FIG. 2 Details of theembodiment in FIG. 1 are shown in FIG. 2 where it will be seen that the unit 20 has a substantially cylindrical housing whose maximum crosssection including the connecting nipples for the various conduits is slightly smaller than the smallest diameter of the manhole 15.
  • the unit 20 may be provided with an eye 50 or a hook or the like, to which a steel cable or similar suspending means 51 may be secured, so that it can be lowered through the manhole 15 until it is immediately adjacent the bottom 17 of the tank, or the layer of grit on the bottom 17.
  • a suction conduit 21 is connected via a rapidconnect and rapid-disconnect coupling, for instance a bayonet coupling 32 of known construction, with a chamber 31 provided in the upper portion 24 of the unit 20.
  • the chamber 31 is further provided at the upper side of the unit 20 with a nipple 33 also provided with a rapid coupling for a suction conduit 34 which extends through the manhole 15to a suction air filter 35 constituting a part of the station 18.
  • a blower 37 for instance a rotary piston blower, is provided with whose suction side the conduit 34 is connected, the blower 37 being connected with the filter 35 (which in turn is connected with the conduit 34) via a conduit 36.
  • the entrained grit 16 is separated from the suction air stream in the chamber 31 of the unit 20 and accumulates in this chamber 31. Dust removed in the filter 35, and any grit which may still be entrained at this point, are discharged via an outlet 38 from the filter 35 into the conduit 28.
  • Reference numeral 39 designates the connecting nipple of the conduit 34.
  • a chamber 41 is further provided in the unit 20 a chamber 41, being located in the lower part of the unit 20 and cooperating with the pneumatic-pressure conveying device 26.
  • the chamber 41 is connected via the diagrammatically illustrated conduit 40 and a connector tom of the chamber 41 in order to fluidize the grit therein and a portion of the compressed air is used directly for entraining this fluidized grit and conveying it through the conduit 44 which is connected at the upper side of the unit 20 with a nipple 45 which is provided with a rapid coupling for the connection of a conduit 46 which extends through the manhole to a filter 47 of the unit 18. In this filter 47 the grit is separated from the stream of air and supplied via an outlet 48 to the conduit 28.
  • the chambers 31 and 41 must be in communication in order to transfer the grit accumulating in the chamber 31 into the chamber 41.
  • This is achieved via a conduit 54 in which a valve, such as a slide valve 55, is provided which is normally closed because there is underpressure in the'chamber 31 and overpressure in the chamber 41.
  • a valve such as a slide valve 55
  • an automatic control opens the valve 55 when a predetermined amount of grit has accumulated 'in the chamber 31, and simultaneously the supply of compressed air via the conduit 40 and the stream of suction air via the conduit 34 are switched off.
  • the station 18 itself is advantageously mounted on a frame 60 provided with wheels or rollers 61 so that it can be moved to the different manholes 15 associated with the different tanks of a vessel.
  • the control device for controlling the various valves is not illustrated because it is known per se and not believed to require detailed discussion. It is, however, advantageously made a part of the station 18 so that only the unit need be located in the tank and only the rope 51 or cable 51, the conduit 34, the conduit 40, the conduit 27, and the valve-control conduits need pass through the manhole 15.
  • I A device such as illustrated in FIGS. 1 and 2 is capable of conveying without any difficulty an amount of approximately ten tons of grit per hour, and the energy required is relatively low because a pneumatic-pressure conveying device requires substantially smaller amounts of air even at great conveying heights than the suction conveying devices which have been used heretofore.
  • FIGS. 3 and 4 The embodiment illustrated in FIGS. 3 and 4 is somewhat different from that of FIGS. 1 and 2.
  • a separating and recovering station 65 is provided on deck of the ship as shown in FIG. 4, and serves on the one hand for supplying suction air to initially entrain the grit and on the other hand to segregate the entrained grit from the stream of air.
  • the suction air is applied through the suction conduit 66 shown in FIG. 3 which is lowered through a manhole into the tank and which in the illustrated embodiment has an upper tubular portion 67 and a lower tubular portion 68 which is telescopically guided in the portion 67 with slight play.
  • An externally arranged cylinder and piston unit 70 has its cylinder connected to the upper tubular portion 67 and its piston rod 71 to the lower tubular portion 68.
  • a nonillustrated control device controls the operation of the unit 70 in a sense telescoping the tubular portions 67 and 68 apart or together, depending upon the length required of the suction conduit 66, so that in this manner the length of this conduit can be accommodated to the height of a given tank. Also, it may be necessary to lengthen the conduit 66 when the latter is pivoted in lateral direction in a manner to be discussed subsequently, in order to reach additional portions of the tank bottom.
  • the upper tubular portion 67 as well as the lower tubular portion 68 are composed of several tubular sections which are connected by flanges 69.
  • the conduit 66 is provided with a suction head utilizing a frustoconical ring 72 which so surrounds the lower open end and inlet of the tubular portion 68 that its largest diameter faces upwardly.
  • a cylindrical ring 73 surrounds and is concentric with the tubular portion 68 and the ring 72 and is connected with radial ribs 74 to the tubular portion 68.
  • the lower edge of the cylindrical ring 73 somewhat overlaps the upper edge of the ring 72, defining therewith an annular air gap.
  • the upper end portion of the tubular portion 67 is connected to aball-s'haped container 77 which has secured to it at 79 the diagrammaticallly illustrated feet 78 on which it is supported on the deck of the vessel above the manhole.
  • the connection of the tubular portion 67 with the container 77 is effected via an airtight swivel joint 81 at 79, so that the conduit 66 can be swiveled with reference to the container 77 to permit its inlet opening to be moved to different parts of the tank bottom.
  • a connecting nipple 83 is provided on the container 77 by means of which the latter can be connected with the diagrammatically illustrated (see the broken line) conduit 87 which leads to the station 65.
  • this connecting nipple 83 utilizesa first tubular portion 84 which extends from the interior to the exterior of the container 77 and has at its outer end a transverse wall 82 through which a second tubular portion of smaller diameter and identified with reference numeral 85 extends in coaxial relationship, being provided at its outer free end with a flange 86 at which the conduit 87 is connected.
  • the conduit 87 can also be connected in other ways, for instance by screw threads or the like.
  • the dots in the interior of the container 77 and of the nipple 83 are intended to indicate that and how on initial operation of the device in FIGS. 3 and 4 the picked-up grit will form deposited layers on the inner walls of the container 77 and of the nipple 83, forming a flow channel for subsequently picked-up grit.
  • This is highly advantageous because it means that the thusdeposited layers of grit prevent contact of the subsequently entrained grit with the inner surfaces of the respective walls, so that the sharp-edged grit cannot scour and eventually damage these walls. Because of the boundary layer friction a thin layer of such grit will also become deposited on the walls of the tubular portions 67 and 68 and of the conduit 87, providing similar protection.
  • a connecting nipple 88 connects the conduit 87 with the separating chamber 89 of the station 65 shown in FIG. 4, and a compressed air filter 91 is diagrammatically illustrated in the chamber 89 and serves for continuous separation of entrained grit from the stream of entraining air.
  • Chamber 89 is provided with feet 90 by means of which it rests on glides 92 which permit the station 65 to be moved from place to place.
  • Outlet opening 93 at the lower end of the chamber 89 permits the removal of the separated grit.
  • a non-illustrated discharge compartment in the container 89 permits the removal of the separated grit so that it is possible to provide for continuous operation of the device without having to stop the operation when the accumulated grit is to be removed. Such compartments are already known.
  • a rotary piston suction type blower 96 provides the suction air stream for entrainment of the grit, and it is connected with the chamber 89 via a conduit 94 in which a fine filter 95 is accommodated. This means that in the event the main filter 91 should for any reason become inoperative, the fine filter 95 will almost immediately become clogged and lead to automatic switching-off of the unit. The air which leaves the fine filter is almost completely free of dust and other contaminants of a particulate nature.
  • the ring 72 may have a somewhat different external contour than that illustrated, and the ring 73 can also be varied in its configuration, as long as it is assured that the necessary acceleration and turbulence of the air stream is achieved which is necessary for picking up the grit and conveying it with the same or substantially the same efficiency and effectiveness obtained with the construction discussed with reference to FIGS. 3 and 4. It is pointed out in this connection that the suction head of FIGS. 3 and 4 in effect provides for the same pneumatic pressure conveyance of material which in FIGS. 1 and 2 is obtained with the device 26, because of the significant acceleration with the suction air undergoes in passing through the annular air gap between the rings 72 and 73.
  • An arrangement for conveying particulate material from a lower level within a compartment to an upper level above such compartment comprising first means for entraining and conveying said material by suction, and second means for recovering the conveyed material at said upper level, said first means comprising a suction conduit adapted for insertion into said compartment from said upper to said lower level and having a normally lower outlet opening; and a suction head comprising a frustoconical ring surrounding said outlet opening with its larger diameter portion facing upwardly, and a cylindrical ring concentric with said frustoconical ring and having a lower edge defining with an upper edge of said frustoconical ring an annular air gap.
  • suction conduit having an upper end portion; and further comprising a ball-shaped container normally supported on said upper level;.and an air-tight swivel joint connecting said upper end portion with said container.
  • said container having an interior; and further comprising a connecting nipple for connecting said container with said third means, said connecting nipple having a first tubular portion of larger diameter extending from the interior to the exterior of said container, a second tubular portion of smaller diameter coaxial with said first tubular portion and extending from the interior thereof outwardly beyond a free end of the same, and a coupling on said second tubular portion outside said first tubular portion for connection with said third means.
  • said suction conduit comprising at least two telescoped sections which are extendable and retractable for varying the length of said suction conduit means.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Air Transport Of Granular Materials (AREA)
  • Cleaning In General (AREA)
US00178655A 1970-09-14 1971-09-08 Method and arrangement for conveying particulate material from a lower level to an upper level Expired - Lifetime US3794388A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19702045317 DE2045317A1 (de) 1970-09-14 1970-09-14 Verfahren und Vorrichtung zum Abtransport des bei der Reinigung von Tankschiffen anfallenden Strahlgrittes
DE19712116462 DE2116462C3 (de) 1971-04-03 Mobile pneumatische Fördereinrichtung zum Abtransport von Strahlgritt aus Tankschiffen

Publications (1)

Publication Number Publication Date
US3794388A true US3794388A (en) 1974-02-26

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US00178655A Expired - Lifetime US3794388A (en) 1970-09-14 1971-09-08 Method and arrangement for conveying particulate material from a lower level to an upper level

Country Status (8)

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US (1) US3794388A (enExample)
AU (1) AU466648B2 (enExample)
BE (1) BE771299A (enExample)
CA (1) CA943580A (enExample)
FR (1) FR2107157A5 (enExample)
GB (1) GB1360849A (enExample)
NL (1) NL7111355A (enExample)
SE (1) SE385109B (enExample)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4756646A (en) * 1986-06-04 1988-07-12 Gilbert Spencer Deep hold settling chamber
WO1994028256A1 (en) * 1993-05-28 1994-12-08 Electric Power Research Institute, Inc. Apparatus for pneumatic excavation
US20090047887A1 (en) * 2007-08-13 2009-02-19 Christopher Elabu Vacuum operated coin sorting assembly
US20100034599A1 (en) * 2005-11-16 2010-02-11 Clean Cat Technologies Limited Vacuum Conveying Velocity Control Apparatus and Method for Particulate Material
US11401118B2 (en) 2015-03-04 2022-08-02 Shibakai Co., Ltd. Cargo handling method

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2128571B (en) * 1982-10-12 1986-10-15 Transmatic Fyllan Limited Apparatus for transferring particulate material from one position to another
CN108249162B (zh) * 2017-12-04 2022-08-26 安徽匠桥财务咨询服务有限公司 一种除尘收粮机及其工作方法

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US276879A (en) * 1883-05-01 Gaeet a
US462539A (en) * 1891-11-03 Frederic eliot dtjckiiam
US590084A (en) * 1897-09-14 blanchaed
US918795A (en) * 1908-10-15 1909-04-20 John S Thurman Suction-head for vacuum cotton-pickers.
US936222A (en) * 1909-05-22 1909-10-05 Burrell D H & Co Pneumatic cleaning-tool.
FR768227A (fr) * 1934-02-07 1934-08-02 Diebold & Co Procédé et dispositifs pour le transport pneumatique de grains et substances similaires
US2419386A (en) * 1942-09-24 1947-04-22 Conrad S J Berg Air nozzle
GB709703A (en) * 1948-10-01 1954-06-02 Miag Vertriebs Gmbh Improvements in or relating to pneumatic conveyor pipe lines
US2744792A (en) * 1952-03-07 1956-05-08 William H Mead Apparatus for conveying comminuted materials
SU151958A1 (ru) * 1961-11-22 1961-11-30 пин Г.А. Л Пневматическое всасывающее устройство дл выгрузки и транспортировани сыпучих материалов
US3320727A (en) * 1965-08-02 1967-05-23 Mitchell Co John E Portable vacuum cleaning machine
US3454307A (en) * 1967-04-26 1969-07-08 Pierce Specialized Equipment C Air conveyer and unloader for granular materials and unloading process therefor
US3618302A (en) * 1969-10-17 1971-11-09 Milan S Cornett Unitary portable air cleaner

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US276879A (en) * 1883-05-01 Gaeet a
US462539A (en) * 1891-11-03 Frederic eliot dtjckiiam
US590084A (en) * 1897-09-14 blanchaed
US918795A (en) * 1908-10-15 1909-04-20 John S Thurman Suction-head for vacuum cotton-pickers.
US936222A (en) * 1909-05-22 1909-10-05 Burrell D H & Co Pneumatic cleaning-tool.
FR768227A (fr) * 1934-02-07 1934-08-02 Diebold & Co Procédé et dispositifs pour le transport pneumatique de grains et substances similaires
US2419386A (en) * 1942-09-24 1947-04-22 Conrad S J Berg Air nozzle
GB709703A (en) * 1948-10-01 1954-06-02 Miag Vertriebs Gmbh Improvements in or relating to pneumatic conveyor pipe lines
US2744792A (en) * 1952-03-07 1956-05-08 William H Mead Apparatus for conveying comminuted materials
SU151958A1 (ru) * 1961-11-22 1961-11-30 пин Г.А. Л Пневматическое всасывающее устройство дл выгрузки и транспортировани сыпучих материалов
US3320727A (en) * 1965-08-02 1967-05-23 Mitchell Co John E Portable vacuum cleaning machine
US3454307A (en) * 1967-04-26 1969-07-08 Pierce Specialized Equipment C Air conveyer and unloader for granular materials and unloading process therefor
US3618302A (en) * 1969-10-17 1971-11-09 Milan S Cornett Unitary portable air cleaner

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4756646A (en) * 1986-06-04 1988-07-12 Gilbert Spencer Deep hold settling chamber
WO1994028256A1 (en) * 1993-05-28 1994-12-08 Electric Power Research Institute, Inc. Apparatus for pneumatic excavation
US5487229A (en) * 1993-05-28 1996-01-30 Electric Power Research Institute, Inc. Apparatus for pneumatic excavation
US20100034599A1 (en) * 2005-11-16 2010-02-11 Clean Cat Technologies Limited Vacuum Conveying Velocity Control Apparatus and Method for Particulate Material
US8491228B2 (en) * 2005-11-16 2013-07-23 Brian Snowdon Vacuum conveying velocity control apparatus and method for particulate material
US20090047887A1 (en) * 2007-08-13 2009-02-19 Christopher Elabu Vacuum operated coin sorting assembly
US11401118B2 (en) 2015-03-04 2022-08-02 Shibakai Co., Ltd. Cargo handling method

Also Published As

Publication number Publication date
BE771299A (fr) 1971-12-16
AU3345771A (en) 1973-03-22
SE385109B (sv) 1976-06-08
FR2107157A5 (enExample) 1972-05-05
GB1360849A (en) 1974-07-24
NL7111355A (enExample) 1972-03-16
AU466648B2 (en) 1975-11-06
CA943580A (en) 1974-03-12

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