US3771643A - Start-reversing vertical screw elevator - Google Patents

Start-reversing vertical screw elevator Download PDF

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Publication number
US3771643A
US3771643A US00237068A US3771643DA US3771643A US 3771643 A US3771643 A US 3771643A US 00237068 A US00237068 A US 00237068A US 3771643D A US3771643D A US 3771643DA US 3771643 A US3771643 A US 3771643A
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US
United States
Prior art keywords
casing
conveyor
screw
elevator
receptacle
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.)
Expired - Lifetime
Application number
US00237068A
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English (en)
Inventor
C Schmidth
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.)
FLSmidth and Co AS
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FLSmidth and Co AS
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
Application filed by FLSmidth and Co AS filed Critical FLSmidth and Co AS
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Publication of US3771643A publication Critical patent/US3771643A/en
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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
    • B65G33/00—Screw or rotary spiral conveyors
    • B65G33/24—Details
    • B65G33/34—Applications of driving gear

Definitions

  • the present invention is concerned with screw elevators for granular or pulverulent materials, the elevatorcomprising at least one conveyor screwwhich is rotated in an enclosed casing having a bottom inlet for the material to be conveyed and an outlet at its upper end.
  • an improved screw elevator is provided in which the above disadvantages are substantially avoided.
  • the screw elevator is provided with means for driving the screw conveyor for a short period in the reverse direction before it is started up in the normal direction of transport.
  • the bottom of the casing is provided with a receptacle for accommodating surplus material carried down by the conveyor screw during the initial reverse drive period.
  • the bottom of the casing has means for fluidizing the material to be transported.
  • the fluidization of the material helps especially to distribute the material transported backwards into the receptacle but it improves also the regular transport of the material by the screw elevator after the re-start.
  • the starting of the screw elevator may be regulated by hand, but preferably the re-start is controlled automatically, for example by a time-lag relay and a revolution counter which registers the number of revolutions of the screw conveyor.
  • the reverse starting of the screw elevator can thus be carried out in the shortest possible time, thus reducing to a minimum the amount of material returned to the receptacle, as it is only necessary to ensure that the number of reverse revolutions are just sufficient to break up the compacted mass. Should the reverse speed of the screw or its rate of acceleration from reverse to forward drive become too high, all the material in the casing may slide down to the bottom.
  • the conveyor screw casings preferably have a common bottom part containing weir plates for separating the receptacles for the conveyor screws.
  • this arrangement is advantageous for ensuring that material is present in the bottom of the conveyor casing when a conveyor screw is started, which is important as the material load is necessary to provide protection of the conveyor screw bearings.
  • FIG. 1 is a vertical section through a conveyor with one screw
  • FIG. 2 is part of a vertical section through a conveyor with two screws
  • FIG. 3 is a side view of the conveyor shown in FIG. 2;
  • FIG. 4 is a diagram of the electric connections for a conveyor motor.
  • the elevator comprises a casing 1 of circular cross-section.
  • the casing hasan inlet 2 for material and an outlet 3 at its top and contains a conveyor screw 4 rotatable in the casing by means of an electric motor and a reduction gear coupled to a coupling part 5 of the top of the screw conveyor but not shown in the drawing.
  • the bottom of the tubular casing 1 is equipped with a material reception box 6 the bottom of which has a false bottom 7 for introducing fluidizing air into the casing. Fluidizing air is admitted to the casing through a pipe connection 8.
  • FIG. 2 shows the lower part of a vertical elevator comprising two conveyor screws 10 and 11 in a casing 12 with two separate inlets 13 and 14 for material and means in the form of a false bottom 15 for distributing fluidizing air into the casing and thereby fluidizing the material.
  • the air is introduced through a pipe 16.
  • the lower ends of the two conveyor screws are separated by a weir plate 17.
  • the electric motor driving a conveyor screw is designated 20.
  • the motor is connected to the main supply through a contactor 21 by means of which the direction of the rotation of the motor may be reversed by interchanging two phases.
  • the contactor is operated by means of two coils 22 and 23 which receive their working current through a control box 24 containing interlocking relays which insure that only one of the coils 22, 23 can operate the contactor at a time and time-lag relays, so that a reversal of the motor is made at standstill of the motor.
  • An impulse indicator 25 may be set to stop the motor after a certain number of revolutions of the screw in the direction reverse to the normal direction for transport of material.
  • the casing l When the conveyor screw is stopped, for instance due to failure of the power supply, the casing l is normally partly filled with material being transported whereas the bottom of the casing has only a material level sufficient to feed the vertical conveyor screw. Frequently the material feed to the vertical elevator is regulated according to a level measurement in the bottom of the conveyor casing by means of a suitable indicator which may regulate the feed or a conveyor screw feeding material to the vertical elevator.
  • the bottom casing for one conveyor screw may act also as a receptacle for material returned when the other conveyor screw is reversed.
  • the impulse indicator 24 counts the number of revolutions of the conveyor screw when this is reversed and is preset to stop the reversing according to requirements. It is important to keep the reversing of the conveyor screw at a minimum in order not to compact all the material present in the conveyor casing in the bottom of the casing.
  • a screw elevator for granular or pulverulent material comprising at least one conveyor screw mounted for rotation within an enclosed casing having a bottom inlet for material to be conveyed and an outlet at its upper end, and means for driving each screw conveyor for a short period in the reverse direction before it is started up in the normal direction of transport, the bottom of the casing being provided with (1) a receptacle for accommodating surplus material carried down by the conveyor screw during the initial reverse drive period and (2) means for fluidizing surplus material accumulated therein whereby distribution of material transported back into said receptacle during said reverse drive period and transportation of material during said normal drive period is enhanced.
  • An elevator according to claim 1 including two or more conveyor screws mounted for rotation within said casing and further including one or more weir plates separating the common bottom part of said easing into a seperate receptacle for each of said screws.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Screw Conveyors (AREA)
  • Intermediate Stations On Conveyors (AREA)
  • Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
US00237068A 1971-04-14 1972-03-22 Start-reversing vertical screw elevator Expired - Lifetime US3771643A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9395/71A GB1291542A (en) 1971-04-14 1971-04-14 Screw elevator

Publications (1)

Publication Number Publication Date
US3771643A true US3771643A (en) 1973-11-13

Family

ID=9871153

Family Applications (1)

Application Number Title Priority Date Filing Date
US00237068A Expired - Lifetime US3771643A (en) 1971-04-14 1972-03-22 Start-reversing vertical screw elevator

Country Status (11)

Country Link
US (1) US3771643A (show.php)
AU (1) AU463012B2 (show.php)
BR (1) BR7202210D0 (show.php)
CA (1) CA957312A (show.php)
DE (1) DE2218204A1 (show.php)
ES (1) ES401707A1 (show.php)
FR (1) FR2133674B1 (show.php)
GB (1) GB1291542A (show.php)
IT (1) IT957181B (show.php)
SE (1) SE387305B (show.php)
ZA (1) ZA722053B (show.php)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4628828A (en) * 1983-12-02 1986-12-16 Coal Industry (Patents) Limited Ash handling systems for combustion equipment
US5018668A (en) * 1990-03-30 1991-05-28 Ag-Chem Equipment Co., Inc. Method and apparatus for initiating rotation of vertical auger devices
US5094334A (en) * 1989-09-18 1992-03-10 Reinhold Bobrowski Mechanically driven auger system
WO2001012309A3 (en) * 1999-08-17 2001-07-12 Peter Skov Johansen A method and an apparatus for transporting a fragmented or viscid material
US20070283715A1 (en) * 2005-09-26 2007-12-13 F.L.Smidth Inc. Powder cooler start-up aeration system
US10126054B1 (en) * 2017-08-28 2018-11-13 James P. Shea Thermoplastic kettle auxiliary single-pass oil bath heat exchanger system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0020149A1 (en) * 1979-05-30 1980-12-10 Cera International Limited Drag conveyors

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2045757A (en) * 1934-07-09 1936-06-30 Fuller Co Screw conveyer
US2232545A (en) * 1939-11-16 1941-02-18 Gen Electric Stoker driving arrangement
US2357220A (en) * 1943-06-29 1944-08-29 Albin N Olson Grain elevator
US3300032A (en) * 1964-10-16 1967-01-24 Dion Lucien Forage hopper with auger means
US3633718A (en) * 1968-11-06 1972-01-11 Boewe Boehler & Weber Kg Masch Transmission and brake for stopping conveyors

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1034480A (fr) * 1951-03-28 1953-07-24 Perfectionnements aux élévateurs de grains
FR1096853A (fr) * 1952-10-17 1955-06-27 Constantin E Dispositif distributeur pour matières finement divisées
FR1497789A (fr) * 1965-10-25 1967-10-13 Ammann U Maschf Ag Procédé pour la mise en service d'une installation comportant au moins un tambour tournant contenant une matière
US3572652A (en) * 1968-12-23 1971-03-30 Loren Hale Apparatus for mixing, dispensing and dispersing wet or dry plastic materials under pressure or non pressure

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2045757A (en) * 1934-07-09 1936-06-30 Fuller Co Screw conveyer
US2232545A (en) * 1939-11-16 1941-02-18 Gen Electric Stoker driving arrangement
US2357220A (en) * 1943-06-29 1944-08-29 Albin N Olson Grain elevator
US3300032A (en) * 1964-10-16 1967-01-24 Dion Lucien Forage hopper with auger means
US3633718A (en) * 1968-11-06 1972-01-11 Boewe Boehler & Weber Kg Masch Transmission and brake for stopping conveyors

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4628828A (en) * 1983-12-02 1986-12-16 Coal Industry (Patents) Limited Ash handling systems for combustion equipment
US5094334A (en) * 1989-09-18 1992-03-10 Reinhold Bobrowski Mechanically driven auger system
US5018668A (en) * 1990-03-30 1991-05-28 Ag-Chem Equipment Co., Inc. Method and apparatus for initiating rotation of vertical auger devices
WO2001012309A3 (en) * 1999-08-17 2001-07-12 Peter Skov Johansen A method and an apparatus for transporting a fragmented or viscid material
US20070283715A1 (en) * 2005-09-26 2007-12-13 F.L.Smidth Inc. Powder cooler start-up aeration system
US10126054B1 (en) * 2017-08-28 2018-11-13 James P. Shea Thermoplastic kettle auxiliary single-pass oil bath heat exchanger system

Also Published As

Publication number Publication date
AU4105172A (en) 1973-10-18
IT957181B (it) 1973-10-10
FR2133674A1 (show.php) 1972-12-01
CA957312A (en) 1974-11-05
ES401707A1 (es) 1975-11-01
DE2218204A1 (de) 1972-11-16
ZA722053B (en) 1972-12-27
AU463012B2 (en) 1975-06-24
FR2133674B1 (show.php) 1979-04-06
SE387305B (sv) 1976-09-06
GB1291542A (en) 1972-10-04
BR7202210D0 (pt) 1973-06-14

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