US3838847A - Drum mixer for continuous processing of a granular bulk material - Google Patents

Drum mixer for continuous processing of a granular bulk material Download PDF

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Publication number
US3838847A
US3838847A US00218937A US21893772A US3838847A US 3838847 A US3838847 A US 3838847A US 00218937 A US00218937 A US 00218937A US 21893772 A US21893772 A US 21893772A US 3838847 A US3838847 A US 3838847A
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United States
Prior art keywords
drum
tool
mixing
bulk material
pipe line
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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
US00218937A
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English (en)
Inventor
H Tegelhutter
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.)
Georg Fischer AG
Original Assignee
Georg Fischer AG
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Filing date
Publication date
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Publication of US3838847A publication Critical patent/US3838847A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
    • B22C5/04—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by grinding, blending, mixing, kneading, or stirring
    • B22C5/0409—Blending, mixing, kneading or stirring; Methods therefor
    • B22C5/0459—Blending, mixing, kneading or stirring; Methods therefor with a receptacle rotating about a horizontal or slightly inclined axis, e.g. with fixed or rotating tools

Definitions

  • the shaft rotates the drum at a speed so that a portion of the bulk material, as it moves with the drum, drops in a free fall through the drum.
  • a mixing and kneading tool extends into the bulk material in the drum, preferably into the center of gravity of the bulk material, and the drum, and the tool is rotated so that it provides a flow within the bulk mate rial countercurrent to the flow generated by the rotation of the drum. Further, a pair of the mixing and kneading tools can be used, each rotating opposite to the other.
  • the present invention is directed to a drum mixer for the continuous processing of granular bulk material, especially for reclaiming foundry sand, and, more particularly, it concerns the arrangement of the drum mixer which is adapted to rotate about an axis inclined to the horizontal with the drum rotating at such a speed that a portion of the material charged into the drum drops in a free fall as the material is moved by the rotation of the drum.
  • an apparatus which includes a drum arranged to rotate about an axis inclined to the horizontal, with the drum closed on the side and at one end and open on the other.
  • the dimension between the opened and closed ends of the drum is less than its diameter.
  • driving means are provided for the drum so that it rotates at a speed which permits a portion of the foundry sand within the drum to drop in a free fall. It has been found that the elimination of the lumps in the foundry sand at times presents difficulties for this apparatus.
  • the present invention incorporates at least one rotating mixing and kneading tool of a mixing apparatus which is preferably positioned in the center of gravity of the compact bulk material located within the lower region of the drum.
  • the characterizing feature of the use of the mixing and kneading tool is that it is rotated within the material so that it provides a flow within the material counter current to the flow developed by the drum as it rotates.
  • FIG. 1 is a vertical sectional view through a mixing apparatus embodying the present invention
  • FIG. 2 is a schematic representation of the manner in which the material is moved within the mixing appara tus
  • FIG. 3 is a schematic representation of the flow of the material within the mixing apparatus due to the combined action of a drum and a mixing and kneading tool;
  • FIG. 4 is a schematic representation, similar to that in FIG. 3, in which a pair of mixing and kneading tools are positioned within the material.
  • FIG. 1 a mixing apparatus for reprocessing foundry sand is illustrated and includes a drum mixer I mounted on a centrally arranged drum shaft 2 for rotation about an axis arranged at an acute angle to the horizontal.
  • the drum mixer l is formed by a conically shaped drum bottom or end 15 to which the shaft 2 is attached with a circumferentially extending wall extending axially from the end 15.
  • Opposite the end 15 the drum is open and an edge member or flange 14 extends inwardly from the side of the drum and the inwardly extending dimension of the flange l4 determines the height of the compact foundry sand 7 within the lower portion of the drum 1, note FIG. 1.
  • the drum shaft 2 is connected to a drive 3' and it is rotatably mounted in a pair of axially spaced bearings 4,4.
  • a conveyor belt 8 is located above the open end of the drum.
  • Another conveyor belt 9 is located below the drum for the continuous discharge of the reclaimed foundry sand which flows over the flange 14 on the drum.
  • a mixing and kneading tool 5 driven by a known mixing apparatus 6.
  • the tool 5 extends into the center of gravity of the foundry sand 7 in the lower portion of the drum.
  • the mixing apparatus 6 is movably mounted for maintaining the tool 5 at the center of gravity of the foundry sand 7 and it includes a follow-up device for the automatic guidance of the mixing and kneading tool.
  • a pipe line 12 having a nozzle 13 at its end extends into the druml so that the nozzle is located above the body of the foundry sand 7 and serves to direct a supply of water into the sand.
  • a valve 16 is arranged in communication with a control line 11 which extends to a control device 10.
  • measuring lines 26 extend between the control device 10 and the driving motor 6 of the mixing and kneading tool 5 so that the addition of water can be regulated in dependence on the input of the driving motor 6.
  • Clay-binders, coal dust and other substances can be added to the foundry sand either separately or with the water through the nozzle 13 by providing a proper design for the nozzle.
  • additional substances in the form of a slurry can be introduced into the pipe line 12 through a branch pipe 24 which is connected to a dosing device 25. As indicated above, it is also possible to supply these substances into the drum without using the pipe line 12 and the nozzle 13.
  • FIG. 2 a schematic representation is provided of the manner in which the granular bulk material or foundry sand travels within the drum as the drum rotates.
  • the speed of the drum 1 and of the variably insertable mixing and kneading tool 5, as well as the inclination of the shaft 2 for the drum depend to a great extent on the type and composition of the foundry sand being reprocessed. With a properly selected ratio of speed and inclination of the shaft 2 and of the mixing and kneading tool 5, the foundry sand within the drum can be divided. As a rule, the speed of the drum 1 will be slower than that of the mixing and kneading tool 5.
  • a third portion 20 of the sand is carried upwardly above the angle of repose and detaches itself from the drum 1 and returns in a free fall as a spray of sand through the portions 17 and 19.
  • the mixing and kneading tool 5 contributes to the circulation of the compact body 7 of the sand and the direction of rotation of the tool is opposite to the direction of rotation of the drum.
  • the oppositely directed rotation of the tool provides a counter-current flow 21 in the sand relative to the flow provided by the drum. Due to the counter-current flow 21, the mixing and separation of the sand is intensified, because the individual grains of sand rub each other and are thus refined.
  • air is introduced into the foundry sand with the result that a particularly loose and moldable sand is obtained.
  • FIG. 3 is a schematic showing of the bii'atififiii? mixing and kneading tool 5 in a cross section of the body 7 of the foundry sand, showing the countercurrent flow 21 to the flow of the sand developed by the drum.
  • FIG. 4 a schematic representation is provided of the manner in which two spaced mixing and kneading tools 5', 5", which rotate in opposite directions, provide an intensified mixing action within the compact body 7 of the foundry sand.
  • Drum mixer for th e contiiiuous pTo cessing of 5' tending radially inwardly from the end of said closed side spaced outwardly from said closed end and the radially inner edge of said flange defining the opening in the opened end of said drum, means for supplying granular bulk material into said drum so that a compact body of material is formed in the lower portion of said drum with the surface of the body of material sloping downwardly from said closed end to said radially inner edge of said flange in the lower portion of said drum and with the said radially inner edge forming an outlet edge over which the processed material flows from said drum, said first driving means arranged to rotate said drum at a speed so that the compact body of material remains in the lower portion of said drum, wherein the improvement comprises a mixing and kneading tool mounting such that it extends into said drum below the axis of rotation of said drum and said tool having a head end arranged to be positioned below the downwardly sloping surface of the compact body of material
  • Drum mixer as set forth in claim 1, wherein a pipe line having a nozzle at its end is arranged for spraying water into the body of material in the lower portion of said drum with said nozzle spaced above the body of material, a branch pipe connected to said pipe line for adding solid substances in powder, granular and slurry form into said pipe line for introduction into the material in said drum through said nozzle.
  • Drum mixer as set forth in claim 2, wherein a valve is positioned in said pipe line, a control device connected to said second driving means, a control line extending between said control device and said valve, so that the addition of water into said drum through said pipe line can be regulated in dependence on the imput of said second driving means.
  • Drum mixer as set forth in claim 1, wherein at least two mixing and kneading tools are arranged within the compact body of the within said drum.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
US00218937A 1971-01-21 1972-01-19 Drum mixer for continuous processing of a granular bulk material Expired - Lifetime US3838847A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH87471A CH523106A (de) 1971-01-21 1971-01-21 Trommelmischer zum ununterbrochenen Aufbereiten von Schüttgut, insbesondere von Giessereisand

Publications (1)

Publication Number Publication Date
US3838847A true US3838847A (en) 1974-10-01

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00218937A Expired - Lifetime US3838847A (en) 1971-01-21 1972-01-19 Drum mixer for continuous processing of a granular bulk material

Country Status (4)

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US (1) US3838847A (enExample)
CH (1) CH523106A (enExample)
DE (1) DE2162560B2 (enExample)
FR (1) FR2122584B1 (enExample)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4189237A (en) * 1976-07-06 1980-02-19 Bake Willem J H Method of preparing and pouring concrete on a building site and a container and a vehicle for use with this method
US4275836A (en) * 1978-09-22 1981-06-30 Intradym Maschinen Ag Method and apparatus for spraying concrete
WO1984000948A1 (en) * 1982-09-02 1984-03-15 David J Miller Apparatus and method for unloading bulk materials
US4738350A (en) * 1982-09-02 1988-04-19 Miller Formless Co., Inc. Apparatus for unloading bulk materials
US5191966A (en) * 1982-09-02 1993-03-09 Miller Formless Co., Inc. Apparatus and method for unloading bulk materials
US5816312A (en) * 1994-09-30 1998-10-06 Mazda Motor Corporation Method of and apparatus for reclaiming foundry sand
EP1125627A3 (en) * 2000-02-19 2001-12-19 General Kinematics Corporation Apparatus for blending water with sand
DE102007027298A1 (de) 2007-06-11 2008-12-18 Maschinenfabrik Gustav Eirich Gmbh & Co. Kg Verfahren zur Aufbereitung von Formsand

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3537980A1 (de) * 1985-10-25 1987-04-30 Badische Maschf Gmbh Verfahren zum mischen von giesserei-formstoffen

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3277540A (en) * 1963-05-02 1966-10-11 Buhrer Erwin Device for refining foundry sand in a continuous manner
US3338560A (en) * 1965-04-15 1967-08-29 Dow Chemical Co Mixing apparatus
US3674241A (en) * 1969-08-16 1972-07-04 Wilhelm Eirich Mixing machine
US3690622A (en) * 1969-02-28 1972-09-12 Pia Beatrice Brunner Rohrer Processing and mixing machine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3277540A (en) * 1963-05-02 1966-10-11 Buhrer Erwin Device for refining foundry sand in a continuous manner
US3338560A (en) * 1965-04-15 1967-08-29 Dow Chemical Co Mixing apparatus
US3690622A (en) * 1969-02-28 1972-09-12 Pia Beatrice Brunner Rohrer Processing and mixing machine
US3674241A (en) * 1969-08-16 1972-07-04 Wilhelm Eirich Mixing machine

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4189237A (en) * 1976-07-06 1980-02-19 Bake Willem J H Method of preparing and pouring concrete on a building site and a container and a vehicle for use with this method
US4275836A (en) * 1978-09-22 1981-06-30 Intradym Maschinen Ag Method and apparatus for spraying concrete
WO1984000948A1 (en) * 1982-09-02 1984-03-15 David J Miller Apparatus and method for unloading bulk materials
US4738350A (en) * 1982-09-02 1988-04-19 Miller Formless Co., Inc. Apparatus for unloading bulk materials
US5191966A (en) * 1982-09-02 1993-03-09 Miller Formless Co., Inc. Apparatus and method for unloading bulk materials
DE19536803B4 (de) * 1994-09-30 2008-08-14 Maschinenfabrik Gustav Eirich Gmbh & Co. Kg Verfahren und Vorrichtung zur Aufbereitung von Formsand
US5816312A (en) * 1994-09-30 1998-10-06 Mazda Motor Corporation Method of and apparatus for reclaiming foundry sand
EP1125627A3 (en) * 2000-02-19 2001-12-19 General Kinematics Corporation Apparatus for blending water with sand
DE102007027298A1 (de) 2007-06-11 2008-12-18 Maschinenfabrik Gustav Eirich Gmbh & Co. Kg Verfahren zur Aufbereitung von Formsand
WO2008151874A1 (de) * 2007-06-11 2008-12-18 Maschinenfabrik Gustav Eirich Gmbh & Co. Kg Verfahren zur aufbereitung von formsand
US20100181042A1 (en) * 2007-06-11 2010-07-22 Maschinenfabrik Gustav Eirich Gmbh & Co. Kg Method for processing moulding sand
US8225844B2 (en) 2007-06-11 2012-07-24 Maschinenfabrik Gustav Eirich Gmbh & Co. Kg Method for processing moulding sand
KR101477513B1 (ko) * 2007-06-11 2014-12-30 마쉬넨파브릭 구스타프 아이리히 게엠베하 운트 코. 카게 주물사 처리방법

Also Published As

Publication number Publication date
FR2122584A1 (enExample) 1972-09-01
DE2162560A1 (de) 1973-03-08
DE2162560B2 (de) 1973-08-09
FR2122584B1 (enExample) 1975-03-21
CH523106A (de) 1972-05-31

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