US3277540A - Device for refining foundry sand in a continuous manner - Google Patents

Device for refining foundry sand in a continuous manner Download PDF

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Publication number
US3277540A
US3277540A US307233A US30723363A US3277540A US 3277540 A US3277540 A US 3277540A US 307233 A US307233 A US 307233A US 30723363 A US30723363 A US 30723363A US 3277540 A US3277540 A US 3277540A
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United States
Prior art keywords
drum
sand
foundry sand
continuous manner
foundry
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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
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US307233A
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English (en)
Inventor
Buhrer Erwin
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Georg Fischer AG
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Individual
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Publication of US3277540A publication Critical patent/US3277540A/en
Assigned to GEORG FISCHER AKTIENGESELLSCHAFT, reassignment GEORG FISCHER AKTIENGESELLSCHAFT, ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: REPLAG REPLASTIFIZIERUNGS AG
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F29/00—Mixers with rotating receptacles
    • B01F29/40—Parts or components, e.g. receptacles, feeding or discharging means
    • B01F29/403—Disposition of the rotor axis
    • B01F29/4033—Disposition of the rotor axis inclined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F29/00—Mixers with rotating receptacles
    • B01F29/60—Mixers with rotating receptacles rotating about a horizontal or inclined axis, e.g. drum mixers
    • 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
    • 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
    • B22C5/08—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by sprinkling, cooling, or drying

Definitions

  • the present invention relates to an apparatus for reclaiming foundry sand in a continuous manner while employing a rotatable unilaterally closed drum with inclined axis, the length of said drum being less than the diameter of the drum.
  • the sand of a relatively low temperature which is strongly over-humidified.
  • the strongly over-humidified portion of the foundry sand has the tendency to form clumps of different sizes when it intermixes with the dried-out sand, for instance when the sand is handled. Since, however, for the further reclaiming of the sand, it is of importance that the sand is as free from clumps as possible and has a substantially uni-form humidity and temperature, numerous attempts have been made to obtain this desirable condition. Attempts to obtain a certain uniformity and equalization by means of a paddle mixer have failed.
  • a device comprising a rotating mixing bowl open at the top and adapted to have its rotating shaft adjusted along an incline, while a rotating agitator is eccentrically arranged with regard to the axis of the mixing bowl.
  • This device could realize the desired mixing set forth above only by means of an agitator which latter, however, is liable to considerable and fast wear in view of the grinding effect of the sand.
  • foundries In foundries it is unavoidable that also molds containing no casting have to be emptied.
  • the foundry sand encountered in such instances is not hot but cold and is not dry but humid. Efforts have been made to mitigate this sudden change of the properties of the foundry sand by the installation of silos.
  • FIG. 1 diagrammatically illustrates a top view of an apparatus according to the present invention.
  • FIG. 2 is a vertical section taken along the line IIII of FIG. 1 but with the addition of an insulating layer around the drum to protect the same against heat loss.
  • FIG. 3 diagrammatically illustrates the operating effect of an apparatus according to the present invention.
  • an apparatus according to the present invention which comprises a rotatable unilateral drum the axis of which is inclined with regard to the horizontal plane and in which the length of the drum is less than the drum diameter.
  • This apparatus according to the invention differs from heretofore known devices of the type involved in that the axis of the drum is inclined with regard to the horizontal plane by an angle of from 5 to 30.
  • driving means are provided which impart upon the drum a speed of rotation at which the pourable goods introduced into the drum and partially in a free fall, fall through the interior of the drum.
  • the apparatus illustrated therein comprises a drum 1 the axis of which is inclined with regard to the horizontal plane by an angle of approximately 30.
  • the said drum 1 has a bottom 2 and a shaft 3 rotatably journalled in bearings 4.
  • the drum 1 is adapted to be rotated by means of a motor 5, a transmission 6 and chain drive 7.
  • Drum 1 is, at its open side, provided with a flange or retainer wall 8 the height of which determines the quantity of the sand 9 it can hold.
  • a conveyor belt 10 adjacent the opening of drum 1 senves for continuously feeding foundry sand into the drum, while a conveyor belt 11 takes care of the continuous withdrawal of the sand discharged above the inner periphery of the flange or retainer wall 8.
  • a pipe 12 equipped with a nozzle 13 at one end thereof serves for the feeding of water or if desired simultaneously also of a clay-like binder and coal dust or other substances, for instance in the form of slurry, into the drum.
  • the apparatus illustrated in the drawings is furthermore provided with a adjusting device, generally designated 14 by means of which the inclination of the axis of drum 1 with regard to the horizontal plane may be varied in a manner known per se.
  • the transmission 6 is an infinitely variable transmission of any conventional type, for instance of the type set forth in German Patent No. 898,837 that is equipped with a handwheel 16, by means of which the transmission 6 may be varied in a stepless mannerto thereby adjust the proper speed of drum 1.
  • FIG. 3 The operation of the apparatus according to the invention is illustrated in FIG. 3.
  • the speed of rotation of drum 1 and the inclination of the axis of the drum relative to a horizontal plane are partially dependent on the type and the composition of the foundry sand to be reclaimed.
  • the foundry sand in said drum is sub-divided into so to speak three sections or portions.
  • One section 17 of the sand introduced into the drum will when, during the rotation of the drum exceeding the angle of heaping, slide back in an avalanche-like manner.
  • a further section or portion 18 of the sand will slide along the drum bottom 2 and back into its starting position and will impact upon the sliding-off portion 17 in the respective lowermost part of the drum wall.
  • a third portion 19 of the sand which, together with the drum wall 1, moves close to the latter,'is carried beyond the angle of heaping and so to speak as a sand rain will in a free fall drop into the portions 17 and 18.
  • This operation will assure a particularly and intensive and quick intermixture of the sand in the drum.
  • the thus reclaimed sand will, during the rotation of the drum in a continuous manner, pass over the respective lower retaining wall section 8 (shown in FIG. 3) and be discharged onto a conveyor belt 11 by which it may be moved to a desired location.
  • Water is introduced into the sand in the drum by means of a pipe line 12 and a nozzle 13 at the end adjacent said drum.
  • the drum bottom In order to prevent the foundry sand from sticking to the inner side of the drum, for instance to the drum bottom, it is advantageous to provide the drum with a heating device.
  • the drum bottom In the particular example shown in FIGS. 1 and 2, the drum bottom only is adapted to be heated by heat radiation. Portions of the drum which are not heated may advantageously be provided with a heat insulation 21.
  • the mixing eifect of the drum on the sand therein may be further increased by selecting the angle on (FIG. 2) formed by a generatrix of the conical drum bottom 2 with a plane perpendicular to the axis of drum shaft 3 so that the angle or will be greater than the angle of inclination B, i.e. the angle confined by the drum shaft 3 with a horizontal plane.
  • the device according to the present invention it will be possible to introduce into the drum not only the water required for a successive cooling of the foundry sand but additionally the total quantity of water required by the sand for all reclaiming operations, and furthermore to introduce the bonding clay, the coal dust or other substances, and the temperature and the moisture of the foundry sand will be equalized in one and the same device. In this way, the mixing operation of the sand which normally is expensive can be efiected in a considerably shorter time.
  • a device according to the present invention has the further advantage that sudden changes in the state of the sand for instance by admixing thereto the sand of molds which had not been poured with liquid metal will be equalized and will more properly be controlled automatically.
  • a drum open at one end and closed at the opposite end and having a length less than its diameter
  • a rotatable shaft for rotating said drum connected to said closed end of said drum and inclined with regard to a horizontal plane at an angle between 5 and 30, the closed end of said drum forming the drum bottom, the major portion of said bottom having a conical shape tapering from its periphery toward said shaft at an angle to a plane perpendicular to the axis of said shaft greater than the angle between said shaft and a horizontal plane
  • said drum also having a cylindrical, peripheral side wall extending axially from said closed end parallel to said axis of said shaft, and an end flange on the outer end of said cylindrical side wall extending axially inwardly
  • said drum being adjustably mounted with said cylindrical side wall at its lower side inclined upwardly and outwardly, said end flange with said cylindrical side wall and said closed end forming a reservoir portion at the lower side of said drum for a substantial amount of material above the level of the

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Mold Materials And Core Materials (AREA)
US307233A 1963-05-02 1963-09-06 Device for refining foundry sand in a continuous manner Expired - Lifetime US3277540A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH556163A CH402293A (de) 1963-05-02 1963-05-02 Vorrichtung zum ununterbrochenen Aufbereiten von Giessereisand

Publications (1)

Publication Number Publication Date
US3277540A true US3277540A (en) 1966-10-11

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US307233A Expired - Lifetime US3277540A (en) 1963-05-02 1963-09-06 Device for refining foundry sand in a continuous manner

Country Status (7)

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US (1) US3277540A (xx)
AT (1) AT242308B (xx)
BE (1) BE646673A (xx)
CH (1) CH402293A (xx)
DE (1) DE1203919B (xx)
GB (1) GB1015088A (xx)
LU (1) LU45868A1 (xx)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3796412A (en) * 1968-10-07 1974-03-12 Fischer Ag Georg Apparatus and method for controlling moisture content of granular materials
US3838847A (en) * 1971-01-21 1974-10-01 Fischer Ag Georg Drum mixer for continuous processing of a granular bulk material
US4193700A (en) * 1979-01-02 1980-03-18 Peter Fahrni Continuous-flow mixer for the gluing of loose chips of wood, fibers, or other particles
DE3309379A1 (de) * 1983-03-16 1984-09-20 Hubert Eirich Verfahren zur regenerierung von giessereialtsand und vorrichtung zur durchfuehrung des verfahrens
US6158293A (en) * 1996-04-09 2000-12-12 Tsi Incorporated Apparatus for determining powder flowability
US6641296B1 (en) * 1997-04-24 2003-11-04 Jean-Luc Jouvin Method for mixing alginate using a rotatable elliptical bowl
US20100017076A1 (en) * 2005-06-03 2010-01-21 Tcm Corporation Automatic Transmission Device For Wheel Loader And Wheel Loader
US11311848B2 (en) * 2016-03-01 2022-04-26 Centre National De La Recherche Scientifique (Cnrs) Bladeless mixer

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010018751B4 (de) * 2010-04-29 2015-08-13 Laempe & Mössner GmbH Verfahren und Vorrichtung zur Herstellung von Formen oder Kernen insbesondere für Gießereizwecke

Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB190605756A (en) * 1906-03-09 1906-12-13 Frederick John Hill Improvements in or relating to Washing Machines.
US1666577A (en) * 1928-04-17 mccabe
US1666324A (en) * 1926-09-28 1928-04-17 Burn John Faulder Rotary mixing machine
GB311428A (en) * 1928-05-12 1930-05-22 George Franklin Royer Improvements in apparatus for preparing molders' sand
GB361700A (xx) * 1930-07-17 1931-11-26 Baer & Stein, Metallwaren-Fabrik Aktien-Gesellschaft
US1905490A (en) * 1929-12-14 1933-04-25 Perfect Circle Co Molding machine
US2176874A (en) * 1938-05-17 1939-10-24 John Dee St Concrete mixing wheelbarrow
CA446205A (en) * 1948-01-13 Langford Harry Portable mixing machine
US2573296A (en) * 1948-06-18 1951-10-30 El Sereno Machine Works Portable mixing machine
US2707314A (en) * 1951-10-23 1955-05-03 Simpson Herbert Corp Method of reclaiming granular material
US2783511A (en) * 1954-02-01 1957-03-05 Hydro Blast Corp Method for reclaiming used foundry sand
US2877524A (en) * 1954-07-01 1959-03-17 Mechanical Handling Sys Inc Apparatus for mixing and feeding shell molding material
US3060496A (en) * 1956-02-29 1962-10-30 Mcdowell Company Inc Apparatus for making nodules or pellets
US3151368A (en) * 1961-08-21 1964-10-06 Dietert Co Harry W Rotary screen moldability controller

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA446205A (en) * 1948-01-13 Langford Harry Portable mixing machine
US1666577A (en) * 1928-04-17 mccabe
GB190605756A (en) * 1906-03-09 1906-12-13 Frederick John Hill Improvements in or relating to Washing Machines.
US1666324A (en) * 1926-09-28 1928-04-17 Burn John Faulder Rotary mixing machine
GB311428A (en) * 1928-05-12 1930-05-22 George Franklin Royer Improvements in apparatus for preparing molders' sand
US1905490A (en) * 1929-12-14 1933-04-25 Perfect Circle Co Molding machine
GB361700A (xx) * 1930-07-17 1931-11-26 Baer & Stein, Metallwaren-Fabrik Aktien-Gesellschaft
US2176874A (en) * 1938-05-17 1939-10-24 John Dee St Concrete mixing wheelbarrow
US2573296A (en) * 1948-06-18 1951-10-30 El Sereno Machine Works Portable mixing machine
US2707314A (en) * 1951-10-23 1955-05-03 Simpson Herbert Corp Method of reclaiming granular material
US2783511A (en) * 1954-02-01 1957-03-05 Hydro Blast Corp Method for reclaiming used foundry sand
US2877524A (en) * 1954-07-01 1959-03-17 Mechanical Handling Sys Inc Apparatus for mixing and feeding shell molding material
US3060496A (en) * 1956-02-29 1962-10-30 Mcdowell Company Inc Apparatus for making nodules or pellets
US3151368A (en) * 1961-08-21 1964-10-06 Dietert Co Harry W Rotary screen moldability controller

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3796412A (en) * 1968-10-07 1974-03-12 Fischer Ag Georg Apparatus and method for controlling moisture content of granular materials
US3838847A (en) * 1971-01-21 1974-10-01 Fischer Ag Georg Drum mixer for continuous processing of a granular bulk material
US4193700A (en) * 1979-01-02 1980-03-18 Peter Fahrni Continuous-flow mixer for the gluing of loose chips of wood, fibers, or other particles
DE3309379A1 (de) * 1983-03-16 1984-09-20 Hubert Eirich Verfahren zur regenerierung von giessereialtsand und vorrichtung zur durchfuehrung des verfahrens
EP0125384A1 (de) * 1983-03-16 1984-11-21 Hubert Eirich Verfahren zur Regenerierung von Giessereialtsand und Vorrichtung zur Durchführung des Verfahrens
US6158293A (en) * 1996-04-09 2000-12-12 Tsi Incorporated Apparatus for determining powder flowability
US6641296B1 (en) * 1997-04-24 2003-11-04 Jean-Luc Jouvin Method for mixing alginate using a rotatable elliptical bowl
US20100017076A1 (en) * 2005-06-03 2010-01-21 Tcm Corporation Automatic Transmission Device For Wheel Loader And Wheel Loader
US8554423B2 (en) 2005-06-03 2013-10-08 Hitachi Construction Machinery Co., Ltd. Automatic transmission device for wheel loader and wheel loader
US11311848B2 (en) * 2016-03-01 2022-04-26 Centre National De La Recherche Scientifique (Cnrs) Bladeless mixer
AU2017228007B2 (en) * 2016-03-01 2022-05-26 Centre National De La Recherche Scientifique Cnrs Bladeless mixer and method

Also Published As

Publication number Publication date
DE1203919B (de) 1965-10-28
BE646673A (xx) 1964-08-17
CH402293A (de) 1965-11-15
AT242308B (de) 1965-09-10
GB1015088A (en) 1965-12-31
LU45868A1 (xx) 1964-06-15

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