US3144244A - Apparatus for heating foundry sand or similar granular material - Google Patents

Apparatus for heating foundry sand or similar granular material Download PDF

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Publication number
US3144244A
US3144244A US255455A US25545563A US3144244A US 3144244 A US3144244 A US 3144244A US 255455 A US255455 A US 255455A US 25545563 A US25545563 A US 25545563A US 3144244 A US3144244 A US 3144244A
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sand
rotor
chamber
burner
heating
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US255455A
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Inventor
William A Hunter
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Pettibone Traverse Lift LLC
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Pettibone Mulliken Corp
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Priority to US255455A priority Critical patent/US3144244A/en
Priority to GB43859/63A priority patent/GB1018657A/en
Priority to SE12827/63A priority patent/SE304358B/xx
Priority to CH1592763A priority patent/CH425096A/de
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Publication of US3144244A publication Critical patent/US3144244A/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
    • B22C5/08—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

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  • the improved heating apparatus comprising the present invention has been designed for use primarily in connection with the heating of foundry sand prior to introduction of the sand into a mulling machine for the purpose of coating the grains of sand with a resinous bonding medium. Heating the sand prior to coating the grains thereof offers certain advantages, the principal advantage being that the heat radiates from the grains themselves, melts the resin, and effects substantially complete evaporation of the solvent, thus forming smooth resinous coatings on the individual grains of sand.
  • the improved heating apparatus is, however, capable of other uses and may, either with or withut modification as required, be employed for heating dry granular materials other than foundry sand and for purposes other than resin-coating.
  • the apparatus may be employed for heating raw sand or other small aggregate material prior to mixing the same with tar or oil in the road building industry, little or no modification of the apparatus being required for this particular purpose.
  • the improved heating apparatus may, with suitable modification, be adapted for use in the drying of moist materials such as grain or the like. Irrespective, however, of the particular use to which the apparatus may be put, the essential features thereof are at all times preserved.
  • the apparatus which has been employed has been of the tumbler type, including as it does a rotatable drum having open ends through which heated air is passed.
  • the sand batch Within the drum is caused, upon rotation of the drum, to tumble in the manner of clothes in a tumbler-type of electric or gas heated clothes dryer.
  • Such apparatus presents numerous problems from a mechanical and operational point of view, and furthermore, the efficiency of such apparatus is low due to the fact that heat penetration through large volumes of sand is slow.
  • the present invention is designed to overcome the above-noted limitations that are attendant upon the construction and use of a conventional tumbler drum-type sand heating apparatus, and accordingly, the invention contemplates the provision of a novel sand heating apparatus in which most of these problems are either minimized or eliminated altogether.
  • the invention makes provision for the creation of a continuous thin trajectory curtain of sand and for 3,144,244 Patented Aug. 11, 1964 the intersection of a gaseous flame through this curtain, thus establishing a primary heating zone where all of the sand particles or grains are subjected to intense heat in this region.
  • the invention makes provision for a stationary housing for the sand instead of a rotatable drum and within the housing there is provided a series of sand agitating and conveying members which withdraw sand from the bottom regions of the housing interior and project the same into the aforementioned trajectory.
  • the housing is provided with a sand inlet or charging opening at the top thereof, and a lower batch discharge gate.
  • the sand agitating and conveying members are continuously movable, and since the housing is stationary, the successive batches may be introduced into the housing and removed through the discharge gate without necessitating cessation of the operation of the sand agitating and con veying members.
  • the discharge gate is opened after a batch of sand is heated to the proper extent, the moving sand agitating and conveying members assist in discharging the sand substantially to completion.
  • the present invention is possessed of advantageous novel structural features which are not applicable to a conventional tumbler drum-type sand heating apparatus and among the more important of these is a novel discharge gate construction which embodies an automatically operable sand deflector plate which, when the discharge gate proper is opened, automatically becomes projected into the trajectory of sand within the housing so that during such time as the gate remains open, all sand which is projected into the trajectory will be deflected and directed outwardly through the discharge gate opening, the deflecting operation continuing until substantially all of the sand in the housing is discharged from the housing.
  • FIG. 1 is a front perspective View of a. foundry sand heating apparatus constructed according to the principles of the present invention
  • FIG. 2 is a sectional view taken substantially centrally and vertically through the housing of the apparatus
  • FIG. 3 is a sectional view taken on the line 33 of FIG. 2;
  • FIG. 4 is a rear view of the apparatus with portions thereof in the vicinity of the discharge gate broken away and other portions removed in order more clearly to reveal the nature of the discharge gate;
  • FIG. 5 is an enlarged fragmentary sectional view taken substantially centrally and longitudinally through a gate assembly employed in connection with the present invention and showing the gate proper in its open position;
  • FIG. 6 is a sectional view similar to FIG. 5, but showing the gate proper in its closed position.
  • the heating apparatus that is illustrated therein and is designated in its entirety by the reference numeral 10 has been designed for use specifically in the batch heating of foundry sand preparatory to transferring the heated batch to a mulling machine for admixture with a suitable coating resin.
  • the apparatus involves in its general organization a heavy gauge sheet or plate metal housing structure 12 embodying a housing proper 14.
  • the latter embodies a curved or arcuate bottom wall plate 16 (see FIG. 2) and defines an internal sand heating and circulating chamber 18.
  • a batch of sand which is introduced into the chamber 18 is adapted to be operated upon by a rotary series of sand agitating and conveying members in the form of elongated bucket-like structures or scoops 20 (hereinafter referred to simply as scoops) which create within the chamber 18 a sand movement pattern which is conducive toward elfective heat exchange relation between a sand heating flame issuing from a burner 22 and the moving sand within the chamber.
  • the burner 22 is disposed adjacent to an olfset pocket 24 of the chamber 18 and the scoops 20 are so disposed in the peripheral regions of an open squirrel-cage rotor or structure 26 that, upon rotation of the structure at a predetermined speed, they exert a scooping action on the sand in the bottom region of the chamber 13 and cause the sand to be distributed in and around the chamber 18 in a particular manner so that primary heat assimilation by the sand in the vicinity of the offset pocket 24 of the chamber occurs. Secondary heat assimilation of the sand takes place in the central regions of the chamber 18.
  • the primary and secondary heating of the sand in the chamber 18 constitutes one of the principal features of the present invention and it will be described in considerable detail presently.
  • the sand scoops operate by a positive sand conveying action, first, to pick up sand quantities which are commensurate with their volumetric capacity, and then to convey successive quantities or amounts of sand to the primary heating region in front of the burner 22 where they are projected into a trajectory which intersects the burner flame.
  • Each scoop emerges from the lower portion of the chamber 18 with an excess quantity of sand piled high over the open rim or mouth of the scoop and the speed of rotation of the squirrel-cage structure 26 is such that there is spillage throughout and over the entire upper circumferential region of the structure.
  • This spilled sand falls downwardly through the open squirrel-cage structure in the form of a sparse suspension or rain of sand and secondary heating gases, resulting from the flame at the burner 22 in the primary heating region, pass through the sand suspension and impart further heat to the sand thereof.
  • Sand from both the primary and secondary heating regions falls to the lower portion or the chamber 18 and the process of sand agitation and distribution is continuous throughout the entire heating cycle.
  • a discharge gate 28 is opened. This gate is disposed above the level of the bottom wall 16 of the housing proper 14 and adjacent to the sand trajectory across the burner flame.
  • a deflector plate 34 is automatically projected through a discharge opening 32 and into the trajectory path so that, as sand continues to be flung into the trajectory by the scoops 20, the heated sand, instead of returning to the lower portion of the chamber 18, is discharged from the chamber into a suitable receptacle (not shown) for immediate transfer while still hot to a sand mulling apparatus (also not shown).
  • the gate is closed and a fresh charge or batch of unheated sand is introduced into the chamber 13 through a charging opening 34 in the upper portion of the housing proper 14.
  • the housing structure 12 involves in its general organization a pair of full-height side plates 40 and 42, a partial height back plate 44 (see FIG. 2), upper and lower front plates 46 and 48, an intermediate front plate 50, and the previously-mentioned curved bottom wall plate 16.
  • the upper edge of the intermediate front plate 50 is connected to the lower edge of the upper front plate 46 by a horizontally disposed shelf plate 52.
  • a top plate 54 extends across the housing structure, and in combination with the side plates 40 and 42, the back plate 44, the front plates 46 and 50, and the bottom plate 16, defines the internal sand heating and circulating chamber 18.
  • a charging stack 5% at the top of the housing structure 12 defines the charging opening 34 and communicates with the upper portion of the chamber 18 through an inclined perforated air distribution plate 60.
  • An exhaust opening 62 is provided in the side plate 40 above the level of the plate 60 and is adapted to be connected to the suction side of a blower, and exhaust stack or other exhaust means (not shown) for the air and other gases leaving the heating chamber 18.
  • a screen 62 for catching oversized material or scrap extends across the upper portion of the heating chamber 18 beneath the air distribution plate and slopes downwardly and outwardly in opposite directions from a transverse center line.
  • the side wall 40 is provided with a peephole assembly 66 in order that the interior of the housing structure may be viewed from the outside.
  • the previously-mentioned squirrel-cage structure 26 includes a horizontally disposed supporting shaft 70, the ends of which are .rotatably journalled in shielded bearing assemblies 72 on the side plates 40 and 42. Means are provided for inhibiting the flow of heat by conduction from the shaft 70 to the bearing assemblies 72, and accordingly, each bearing assembly is bolted as at 74 to a vertically extending supporting plate 76 which is maintained spaced from the adjacent side plate 40 or 42, as the case may be, by a rectangular cage structure 78, which, in combination with the side plate 4! defines a chamber 79. A sand return opening 80 is provided in the side plate near the bottom of the chamber 79.
  • a combined sand shield and sand flinger plate 82 is disposed within the space between each supporting plate 76 and the adjacent side plate of the housing structure and is secured in position by a set screw 84.
  • Recessed bushings 86 support the ends of the shaft 70 within the inner faces of the bearing assemblies 72. The extremities of the shaft 70 pass through clearance openings 88 in the adjacent side plates and also through second clearance openings 90 in the supporting plates. 76. 7
  • the bearing assemblies 72 are shielded from contact with any sand which may escape from the chamber 18 through the clearance opening 88 by reason of the flinger plates 82 which have a tendency to throw such sand radially outwardly of the shaft 70 where it will return to the chamber 18 through the openings 80.
  • heat-radiating hub-like extensions 92 are provided on the recessed bushings 86 and are formed with radial heat-radiating fins 94.
  • the shaft is adapted to be driven in one direction by an electric motor (not shown), operating through a suitable power train (also not shown), the terminal application of power being applied to a sheave 96 which is keyed as at 98 to one end of the shaft 70 exteriorly of the housing structure 12.
  • the squirrel-cage structure 26 within the chamber 18 is centered on the shaft 70 between the two side plates 40 and 42 and involves in its general organization a pair of vertically extending spaced apart end plates 100 and 102 (see FIGS. 2 and 3) which are bolted as at 104 to respective hubs 106. The latter are keyed as at 108 to the shaft 70. Set screws 110 hold the bolts 104 in place.
  • the end plates 180 and 102 are circular and the previously-mentioned scoops are in the form of elongated trough-like receptacles presenting open rectangular rims 112, sloping side walls 114, curved bottoms 116, and flat end walls 118.
  • each scoop 20 is welded to the outer periphery of each end plate 100 and 102 and the various scoops are equally and circumferentially spaced about the periphery of the squirrel-cage structure 26 as best shown in FIG. 2, and as a result, their open rims 112 face in the leading direction of rotation of the structure.
  • the curved bottom wall plate 16 of the housing proper 14 is concentric with the horizontal axis of the shaft 70 throughout a major portion of its extent and its radius of curvature is such that only a very small clearance exists between the curved portion of the plate and the various scoops 20 as they sweep past the bottom wall plate during rotation of the squirrel-cage structure 26 in a counterclockwise direction as viewed in FIG. 2.
  • the forward region of the bottom plate 16 is provided with a tangential planar section 122 which lies in an inclined plane that is slightly offset from the inclined plane of a similar planar section 124 provided in the lower region of the intermediate front plate 50 of the housing structure.
  • Pairs of angle pieces 126 are secured by screws 127 to the side plates 40 and 42 and establish therebetween opposed guideways 128 (FIGS. 2, 5 and 6), which slidably receive the side edges of a flat gate plate 130, such gate plate forming a part of the previously-mentioned discharge gate 28.
  • the upper edge of the inclined planar section 122 of the bottom wall plate 16 and the loweredge of the inclined planar section 124 of the intermediate front plate 50, define therebetween the previously-mentioned discharge opening 32 through which heated sand is adapted to be discharged from the chamber 18 during each batch emptying operation.
  • the specific nature of the discharge gate 28 and the manner in which sand is discharged fromthe heating chamber 18 will be set forth in detail presently.
  • an open-ended sand collecting or gathering funnel 140 of wide U-shape design is secured to the inside surface of the intermediate front plate 50 within the chamber 18 and presents a wide upper rim 142 and a narrow lower rim 144.
  • the upper rim 142 of the funnel 140 presents a sand receiving opening which is positioned directly in the trajectory of sand issuing from the various scoops 28 as they sweep forwardly and downwardly in their circular path of movement within the sand heating chamber 18.
  • the lower rim 144 of the funnel defines a restricted discharge opening which is directed downwardly on an incline immediately above the inclined planar section 122 of the bottom wall plate 16 of the housing structure 12.
  • a heat shield 146 extends on an incline downwards and rearwards from the juncture between the screen 64 and the upper front plate 46 to a point close to the circular path of movement of the scoops 21B and its function likewise will be made clear subsequently.
  • Heat is supplied to the interior of the heating chamber 18 by means of the previously-mentioned burner 22 which is preferably in the form of a conventional line burner.
  • This burner is mounted on the horizontal shelf plate 52 and has its downwardly facing burner plate 151) in register with an elongated burner opening 151 in the shelf plate.
  • a series of jet-producing openings 152 in the burner plate 15h produces, in effect, an elongated flame when the burner is ignited, and this flame is directed downwardly through the opening 151 and traverses the trajectory of sand issuing from the various moving scoops 20 and flowing 'to the funnel 140.
  • the exhaust opening 62 in the side plate 40 of the housing structure 12 is adapted to be operatively connected to the suction side of a blower or similar exhaust means as previously pointed out and, as a consequence, the flame issuing from the burner 22 is drawn laterally so that it traverses the sand trajectory over a wide region.
  • the specific combustion system which is associated with the burner 22 forms no part of the present. invention and various systems are available for use for supplying combustible gaseous constituents to the burner.
  • these gaseous constituents are fuel gas and air, these gases being suitably combined in a proportional mixing device (not shown) at a predetermined fuel-air ratio before being conducted to the burner for combustion purposes.
  • a mixing type burner may be employed in place of the line burner 22.
  • oversized screenings are caught by the screen 64, but the main body of the batch of sand falls to the lower regions of the rotating squirrel-cage structure 26.
  • the quantity of sand in a batch may be as much as would fill one-third of the total volume of the heating chamber 18, the sand is kept substantially entirely in agitated suspension within the chamber due to the scooping, spilling and flinging action of the various scoops 20 on the sand.
  • the scooping action takes place in the bottom portion of the heating chamber 18 where the scoops 211 traverse the curved portion of the bottom wall plate 16, lift the sand bodily upwardly along the rear region of said plate, and assume substantially up right positions as they approach and leave the lower edge region of the partial back plate 44.
  • the scoops 2t commence their movement over the upper peripheral region of the rotating squirrel-cage structure 26,.they are filled to overflowing with sand and as their direction of orientation becomes progressively more inclined during passage across the upper regions of the squirrel-cage srtucture, they commence to spill sand downwardly through the open cage-like structure.
  • this sand spillage is the result of overfilling of the scoops and a drainage of the heap or mound of sand which represents the overfill. Subsequently, however, the spillage is the result of tilting of the scoops and an actual pouring of some of the sand from the scoops takes place. Finally, as the scoops approach the offset pocket 24 existing by reason of the horizontal shelf plate 52, there is a forward flinging of the sand under the influence of centrifugal forces acting on the sand so that the aforementioned trajectory or curtain of sand is established for entry into the funnel 140. The rate of rotation of the squirrel-cage structure 26 is carefully regulated so that these phenomena will obtain.
  • the size of the discharge opening afforded by the lower rim 144 of the funnel 140 is selected as a function of the speed of rotation of the squirrel-cage structure 26 so that the funnel restricts the flow of sand back to the bottom regions of the heating chamber 18. Either too large an opening or too slow a rate of rotation of the squirrel-cage will admit the sand too freely to the bottom regions of the chamber so that there will be a pile-up of sand tending to overload the shaft 70 and the driving motor therefor.
  • Too small a funnel opening or too rapid a rate of rotation of the squirrel-cage structure will unduly restrict the flow of sand to the bottom regions of the chamber so that the scoops 20 will have insufficient sand at hand for com plete filling thereof, and after the scoops have spilled their contents at the upper regions of the squirrel-cage structure as heretofore described, there will be insufficient sand to establish a substantial trajectory in the vicinity of the burner 22.
  • One of the principal functions of the funnel 140 is to prevent free flow of sand from the sand trajectory into the entry region between the squirrel-cage structure and the inclined planar section 122 of the bottom wall plate 16. If sand is allowed to accumulate in this region too freely, binding of the scoops will result.
  • the medial region of the heating chamber 18 becomes, in effect, a combustion chamber and establishes a secondary heating zone where the sand which spills from the scoops 20 passing across the upper region of the squirrel-cage structure 26 and falls through the central portion of the squirrel-cage structure is subjected on a secondary or further heating action.
  • the perforated air distribution plate 60 serves to prevent short circuiting of the gaseous products of combustion directly to the exhaust opening 62 with a consequent loss of both heat and sand.
  • This distribution plate retards the upward flow of the gases and contributes toward an even distribution of heat throughout the chamber 18, while at the same time, keeping the sand in the vicinity of the squirrel-cage structure 26 by preventing the sand from becoming unduly airborne.
  • thermometer 153 may be mounted on the back plate 44 in order that it will give an indication or may be caused to render a signal when the sand has reached the desired temperature.
  • gate opening operations will be carried out and the heated batch of sand will be delivered through the discharge openings 32 to the aforementioned receptacle which may conveniently be positioned in front of the housing structure 12 between a pair of generally triangular extensions 154 on the front lower corners of the side plates 40 and 42.
  • the previouslymentioned discharge gate 28, including the flat gate plate and the sand deflector plate 30, is adapted to be operated under the control of an air cylinder 200.
  • the latter is suitably supported on a bracket 202 which is mounted on the lower front plate 48 of the housing structure 12.
  • the air cylinder 200 is provided with a plunger 204, the forward end of which carries a head 206.
  • the latter is secured to an angle piece 208, the right angle flanges 210 and 212 of which are secured along their edges to the outer side of the gate plate 130.
  • the sand deflector plate 30 is provided with side wings 214 which are pivotally connected by horizontal pivot pins 216 to the side plates 40 and 42 of the housing structure 12.
  • the deflector plate 30 is normally urged under the influence of two coil springs 218 to an advanced position wherein it is shown in dotted lines in FIG. 4 and wherein it is projected beneath the discharge opening of the funnel 140. As shown in FIG. 4, the springs surround the pivot pins 216 and have their ends suitably anchored to the side wings 214 and one of the walls 40 or 42, as the case may be. When the gate plate 130 is disposed across the discharge opening 32, the sand deflector plate 30 is maintained in the retracted position wherein it is shown in full lines in FIGS. 4 and 6.
  • the width of the gate plate 130 in a direction transversely of the housing structure 12 is greater than the distance between the side wings 214 of the deflector plate 30 so that the lower edge of the gate plate will engage the upper edges of these side wings during gate closing movements and exert a camming action on the sand deflector plate 30 as a whole, thus tending to withdraw the plate from the interior of the heating chamber 26.
  • the width of the angle piece 208 in the transverse direction of the housing structure is less than the distance between the side wings 214 so that this angle piece may move between these side wings during the terminal gate closing movements as shown in FIG. 6 and exert a camming effect on the upper edge of the deflector plate 30 so as to hold the latter in the retracted position wherein it is shown in full lines.
  • the deflector plate 30 projection of the deflector plate 30 into the heating chamber 18 is automatically effected each time the gate structure is moved to its open position, and that it is withdrawn from the chamber each time the gate structure is moved to its closed position. In its projected position, its withdrawal being effected by the camming engagement of the leading edge of the gate plate 128 with the upper edges of the side wings 214, the deflector plate 30 underlies the lower rim 144 of the funnel so that the sand issuing from the funnel is deflected out through the discharge opening 32.
  • the squirrel-cage structure 26 is continuously rotatable and continues to rotate during batch emptying operations. During such time as the gate structure is in its open condition, the establishing of a trajectory of sand across the front of the burner 22 and the deposition of this sand into the funnel 140 is relied upon for batch emptying purposes.
  • the sand discharge opening 32 is effectively in register with the sand trajectory and is disposed at the terminal end of such trajectory.
  • sand issuing from the trajectory ordinarily would be directed by the deflector plate 30 outwardly from the chamber 18 through the discharge opening 32.
  • the function of the deflector plate 30 is essentially to insure that all of the sand issuing from the trajectory will be discharged from the chamber during emptying operations.
  • the apparatus is of a semi-automatic type in that batch charging and discharging operations are initiated under the control of an operator, fully automatic operations are contemplated wherein the gate opening and closing movements may be initiated under the control of a thermostat (not shown) which may be substituted for the thermometer 153 and may control the operation of the air cylinder 200. Therefore, only insofar as the invention has particularly been pointed out in the accompanying claims is it to be limited.
  • An apparatus adapted to heat foundry sand or the like and comprising a housing defining an internal sand circulating and heating chamber and having an upstanding front wall therein, there being a filling opening in the upper regions of said housing defining a sand inlet for the chamber, a rotor mounted for rotation about a horizontal axis within the chamber and spaced rearwardly from said front Wall, a series of scoops fixedly disposed in circumferentially spaced relationship on the periphery of said rotor, said scoops being operable upon rotation of the rotor in one direction at a predetermined speed of rotation to elevate sand at the rear side of the rotor, carry the same forwardly over the upper region of the rotor, and discharge the same in an approximate tangential trajectory passing generally downwardly through the intervening space existing between-said front wall and the rotor, said front wall being provided with a burner opening in register with said intervening space, a burner positioned to deliver a flame through said burner opening in heat exchange relation with the
  • an open-ended receptacle disposed in said intervening space for receiving sand from the terminal region of said trajectory, said receptacle being provided with a restricted opening in the lower regions thereof for retarding the flow of sand downwardly through said intervening space.
  • An apparatus adapted to heat foundry sand or the like and comprising a housing defining an internal sand circulating and heating chamber and having an upstanding front wall therein, there being a filling opening in the upper regions of said housing defining a sand inlet for the chamber, a rotor mounted for rotation about a horizontal axis within the chamber and spaced rearwardly from said front wall, a series of scoops fixedly disposed in circumferentially spaced relationship on the periphery of said rotor, said scoops being operable upon rotation of the rotor in one'direction at a predetermined speed of rotation to elevate sand at the rear side of the rotor, carry the same forwardly over the upper region of the rotor, and discharge the same in an approximately tangential trajectory passing generally downwardly through the intervening space existing between said front wall and the rotor,,said front wall being provided with a burner opening in register with said intervening space, a burner positioned to deliver a flame through said burner opening in heat exhange
  • An apparatus adapted to heat foundry sand or the like and comprising a housing defining an internal sand circulating and heating chamber and having an upstanding front Wall therein, there being a filling opening in the' upper regions of said housing defining a sand inlet for the chamber, a rotor mounted for rotation about a horizontal axis within the chamber and spaced rearwardly from said front wall, a series of scoops fixedly disposed in circumferentially spaced relationship on the periphery of said rotor, said scoops being operable upon rotation of the rotor in one direction at a predetermined speed of rotation to elevate sand at the rear side of the rotor, carry the same forwardly over the upper region of the rotor, and discharge the same in a trajectory passing generally downwardly through the intervening space existing between said front wall and the rotor, said front wall being provided with a burner opening in register with said intervening space, a burner positioned to deliver a flame through said burner opening in heat exchange relation with the sand in said
  • An apparatus adapted to heat foundry sand or the like and comprising a housing defining an internal sand circulating and heating chamber and havingan upstanding front wall therein, there being a filling opening in the upper regions of said housing defining a sand inlet for the chamber, an open cage-like rotor mounted for rotation about a horizontal axis within the chamber and spaced rearwardly from said front wall, said rotor including a series of elongated trough-like scoops fixedly mounted on the periphery of the rotor in circumferentially spaced relationship with their axes parallel to the axis of rotation of the rotor and with their open rims presented forwardly in the direction of rotation of the rotor, said scoops being operable upon rotation of the rotor in said direction at a predetermined speed of rotation to elevate individual masses of sand during their rising movements at the rear side of the rotor, to spill portions of said masses of sand as they become inclined during their forward movement in the upper regions of the rot
  • An apparatus adapted to heat foundry sand or the like and comprising a housing defining an internal sand circulating and heating chamber and having an upstanding front wall therein, there being a filling opening in the upper regions of said housing defining a sand inlet for the chamber, an open cage-like rotor mounted for rotation about a horizontal axis within the chamber and spaced rearwardly from said front wall, said rotor including a series of elongated trough-like scoops mounted on the periphery of the rotor in circumferentially spaced relationship with their axes parallel to the axis of rotation of the rotor and with their open rims presented forwardly in the direction of rotation of the rotor, said scoops being operable upon rotation of the rotor in said direction at a predetermined speed of rotation to elevate individual masses of sand during their rising movements at the rear side of the rotor, to spill portions of said masses of sand as they become inclined during their forward movement in the upper regions of the rotor so
  • An apparatus adapted to heat foundry sand or the like and comprising a housing defining an internal sand circulating and heating chamber and having an upstanding front wall therein, there being a filling opening in the upper regions of said housing defining a sand inlet for the chamber, an open cage-like rotor mounted for rotation about a horizontal axis within the chamber and spaced inwardly from said front wall, said rotor including a series of elongated trough-like scoops fixedly mounted on the periphery of the rotor in circumferentially spaced relationship with their axes parallel to the axis of rotation of the rotor and with their open rims presented forwardly in the direction of rotation of the rotor, said scoops being operable upon rotation of the rotor in said direction at a predetermined speed of rotation to elevate individual masses of sand during their rising movements at the rear side of the rotor, to spill portions of said masses of sand as they become inclined during their forward movement in the upper regions of the rot

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US255455A 1963-02-01 1963-02-01 Apparatus for heating foundry sand or similar granular material Expired - Lifetime US3144244A (en)

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US255455A US3144244A (en) 1963-02-01 1963-02-01 Apparatus for heating foundry sand or similar granular material
GB43859/63A GB1018657A (en) 1963-02-01 1963-11-06 Apparatus for heating foundry sand or similar granular material
SE12827/63A SE304358B (de) 1963-02-01 1963-11-20
CH1592763A CH425096A (de) 1963-02-01 1963-12-24 Vorrichtung zum Erhitzen von körnigem Gut

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Publication number Priority date Publication date Assignee Title
DE3309379A1 (de) * 1983-03-16 1984-09-20 Hubert Eirich Verfahren zur regenerierung von giessereialtsand und vorrichtung zur durchfuehrung des verfahrens
US6887073B1 (en) * 2004-03-31 2005-05-03 Midco International, Inc. Burner assembly with gate valve damper

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US305596A (en) * 1884-09-23 Monger
US1037479A (en) * 1911-07-21 1912-09-03 Diamant Brikett Werke G M B H Apparatus for coking briquets.
US1807054A (en) * 1928-11-17 1931-05-26 Hartford Empire Co Methods of and apparatus for making glass

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
US305596A (en) * 1884-09-23 Monger
US1037479A (en) * 1911-07-21 1912-09-03 Diamant Brikett Werke G M B H Apparatus for coking briquets.
US1807054A (en) * 1928-11-17 1931-05-26 Hartford Empire Co Methods of and apparatus for making glass

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US6887073B1 (en) * 2004-03-31 2005-05-03 Midco International, Inc. Burner assembly with gate valve damper

Also Published As

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CH425096A (de) 1966-11-30
SE304358B (de) 1968-09-23
GB1018657A (en) 1966-01-26

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