| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 141 | Plant for continuously regenerating foundry sand and associated method | US09371859 | 1999-08-11 | US06399032B1 | 2002-06-04 | Bartolomeo Tosco |
| The plant for continuously regenerating foundry sand comprises a combustion chamber, in which a combustible gas is added to the sand, and a cooling chamber, in which the sand coming from the combustion chamber is cooled, both chambers being provided with systems for maintain the sand in a fluidized state. The chambers are also in direct communication with one another in the manner of communicating vessels in such a way that, during normal operation in equilibrium, the free surface of the sand may be at the same level in the two chambers. | ||||||
| 142 | Reclaiming foundry sand by gravity flow system | US996167 | 1997-12-22 | US6120284A | 2000-09-19 | George E. Good; Richard L. Martin; Rodney G. Montrose; Cameron A. Montrose |
| A method of reclaiming foundry sand by (a) providing a treatment tower having a plurality of heat conductive tubes extending across the interior of the treatment tower, the tubes being arranged in rows and staggered with respect to tubes in adjacent rows to create close spacing therebetween sufficient to permit the sand to flow continuously and non-turbulently along the contours of the exterior under the influence of gravity before dropping to the next adjacent tube to thereby again flow continuously and non-turbulently in successive sequence downwardly of the tower; (b) quiescently heating the interior tower space and tubes to a temperature in excess of 1300.degree. F. and introducing sufficient air or oxygen to permit combustion of the resin binder; and (c) feeding particulated sand to the top of the tower and tubes whereby such sand controllably flows along and through such labyrinth of tube spacings with little or no dwell on each contacted tube and in a time period of 5-15 seconds, said sand exiting from the bottom of said tower with said binder having been combusted to form a gas that is extracted from the top of the tower. | ||||||
| 143 | Method of and system for recycling molding sand | US37734 | 1998-03-10 | US6030111A | 2000-02-29 | Minoru Tokuyoshi; Toshisaburo Kimura; Takashi Suginaka |
| Molding sand of a used greensand mold is recycled by adding water and binder to sand particles fatigued by heating applied by a molten metal during molding and segregated from vigorous molding sand not directly heated by the molten metal and mixing the refreshed molding sand particles with the vigorous molding sand. | ||||||
| 144 | Method and device for cooling foundry sand | US620366 | 1996-03-22 | US5915833A | 1999-06-29 | Ernst Otto Kruse |
| A cooling apparatus for used foundry sand provided with a homogenizing and conveying apparatus in a constant vacuum with controlled water inflow and a suction point for the water vapor, the water evaporating due to the reduced pressure draws the heat of evaporation from the sand, the apparatus having a condenser in which the vapor condenses into water which is cooled and re-used, and coupled locks provided on the inlet and outlet of the conveying apparatus, through which the sand enters and leaves the reduced pressure area. | ||||||
| 145 | Apparatus for the processing of foundry sands | US158975 | 1993-11-29 | US5477909A | 1995-12-26 | Norbert Becker |
| A mold sand is regenerated with or without mixing with new sand and followed by the addition of binder to it by fluidizing the sand in a chamber as it passes from an inlet to an outlet which can be a step or downcomer opening into the mixer. Compressed air is forced from below through the sand and entrains away small particles while coarse particles or heavy pieces are collected in a discharge unit which can be opened from time to time to carry away the coarse materials. | ||||||
| 146 | Apparatus and method of cooling refractory sand based on dew point temperature | US165755 | 1993-12-10 | US5386868A | 1995-02-07 | Jack R. Kingman; Gordon Perkins |
| Foundry molds are made principally from a mixture of refractory sand, a binder and a catalyst. The temperature of recycled sand is measured and a cooling medium is contacted with the sand. The flow of the cooling medium is controlled to cool the sand to a temperature within a predetermined temperature range which is slightly above a measured dew point temperature. Controlling the sand temperature to a temperature slightly above the dew point temperature prevents moisture condensation in the sand which interferes with binder curing to provide increased strength and controlled shelf life in the sand, binder and catalyst mixture. | ||||||
| 147 | Method for recovering foundry sand by roasting | US859316 | 1992-05-28 | US5299618A | 1994-04-05 | Pio Fumagalli |
| The method permits recovery of spent foundry sand for reuse by eliminating, by combustion, the organic and carbon substances with which the spent sand is impregnated; spent sand, after grinding to a uniform grain size, is placed into a cylindrical container (2) inclined with respect to the vertical and rotated slowly (4-6 revolutions per minute); then, a stream of oxygen is blown into the base of the container through a distributor (5) which uniformly distributes it into the spent sand mass (20), and local combustion is initiated on the surface of the sand mass, at the top of container, by a burner (31); finally the burner is extinguished whilst the delivery of the oxygen stream is maintained and the combustion proceeds and feeds itself by the effect of a progressive descent of the flame front (30) towards the base of the container until complete destruction of the organic and carbon substances contained in the sand has taken place. | ||||||
| 148 | Process for thermically recovering old sands obtained in casting plants and for treating the dusts obtained during circulation of the sand | US698402 | 1991-05-10 | US5289920A | 1994-03-01 | Volker Godderidge; Walter Stuzmann |
| A process for thermically recovering old sand obtained in casting plants and for treating dust containing combustible organic components and incombustible inorganic components is disclosed. Dust obtained by mechanical preparation of the old sand is separated from the sand. The sand is used to form a fluid bed in a fluid-bed kiln having a post-combustion space and an outlet for releasing combustion gases. Dust containing combustible organic components and incombustible inorganic components is introduced into the fluid bed, the combustion of the organic components being used to maintain reaction temperature in the fluid bed. The heat of the fluid bed and the post-combustion space deactivates inorganic components of the dust, which are transported by released combustion gases to effectively separate the inorganic components of the dust from the thermically recovered old sand. These deactivated inorganic components of the dust can be separated from the released combustion gases for easy disposal. | ||||||
| 149 | Method for controlling the oxidation and calcination of waste foundry sands | US803047 | 1991-12-06 | US5251684A | 1993-10-12 | Robert S. L. Andrews; Gerald J. Reier |
| The waste sands are passed to a calcining chamber having a floor, connecting sidewalls and a top. The floor of the calcining chambers provided with a plurality of vents. The calcining chambers also connected to a separate firebox which produces fluidizing hot gases for fluidizing waste sands within the calcining chamber and forming a fluidized sand bed. The fluidizing hot gases are introduced into the calcining chamber by means of the floor vents. By precisely controlling the temperature of the waste sands within the fluidized bed, a more consistent product is produced while maintaining the temperature of the waste sands below a critical temperature at which the organic binders present on the sand grains would be fused to the waste sand grains. | ||||||
| 150 | Method of temperature treating granular material | US313016 | 1989-02-21 | US4914922A | 1990-04-10 | Dino Talavera |
| A process for temperature treating a granular material such as sand by the use of ambient air moving through the material, as it drops under gravity from a screen, at a wind velocity high enough to invoke forced convection as an aid in accomplishing the temperature controlling function. | ||||||
| 151 | Apparatus and method for controlling sand moisture | US913197 | 1986-09-30 | US4780665A | 1988-10-25 | Wade S. Mitchell |
| An apparatus for controlling the moisture content of sand as it is transported from storage to a mold making apparatus. A conveyor is used to transport a substantially uniform layer of sand at a known rate. The electrical resistance across the sand layer is measured using a series of electrically conductive members that extend into the sand. A thermocouple or other contact device is used to obtain an average temperature of the sand layer. The electrical resistance and average temperature measurements are used in a signal processor to calculate a starting moisture content for the sand. The signal processing unit also calculates an amount of water that should be added to the sand to achieve a computed moisture content value. The signal processing unit further controls the means for adding the water to the sand so that the computed moisture content value is obtained. | ||||||
| 152 | Method and apparatus for reclaiming foundry sand | US738884 | 1985-05-28 | US4620586A | 1986-11-04 | Albert Musschoot |
| The present invention relates to a method and apparatus to be used in the reclamation of foundry sand. Mold flasks containing foundry sand shaped by a pattern to form a cavity into which molten metal has been poured are, after the metal has set, subjected to greatly reduced atmospheric pressure whereby to cause the moisture in the foundry sand to evaporate into water vapor, thereby removing moisture and heat from the sand so that the particles can be reused free of lumps or clumping of sand. | ||||||
| 153 | Method and apparatus for cooling foundry sand | US391987 | 1982-06-25 | US4611469A | 1986-09-16 | Albert Musschoot |
| The invention relates to a method for treating moist pulverulent material and is particularly useful for removing the moisture from such material. In one aspect of the invention, the material is hot foundry sand, where the sand is first moistened by the addition of water and then the moist sand is treated in a vibrating container under vacuum. | ||||||
| 154 | Method of reclaiming sand used in evaporative casting process | US549131 | 1983-11-07 | US4544013A | 1985-10-01 | Dolores C. Kearney; Peter Giza; Bruno Matz |
| The invention is a method of reclaiming sand used in a method of casting a metal having a liquidus temperature below 2000.degree. F., the casting method using a vaporizable pattern set within a mold constituted of unbonded sand. The method comprises: (a) blowing, after a predetermined lapse of time after the pouring of the metal into the mold, a combustion supporting gas into and through substantially the entire volume of the mold to levitate at least a region of the sand adjacent to the casting and to combust volatilized byproducts of the pattern entering the mold, and (b) continuing the blowing of the combustion supporting gas to continue combustion and driving of the gas and byproducts of the combustion out of the mold. | ||||||
| 155 | Method of and apparatus for treating granular material | US330864 | 1981-12-15 | US4437834A | 1984-03-20 | Alfredo Vogel |
| A method and apparatus for treating granular materials which require to be heated to drive off volatile constituents and which require to be cooled, for example foundry sand containing an organic binder. The method comprises the step of maintaining a mass of the material at a treatment temperature lying in the range 240.degree. C.-400.degree. C. for between four and thirty hours. The mass may be initially heated by virtue of a manufacturing process in which the mass has been previously used. Alternatively, the mass may be initially heated by a preheating step such as heating in a fluidized bed. Alternatively, the mass may be heated by being placed in heat transfer relationship with a second mass of the material which has been previously heated, for example, in a fluidized bed. Apparatus for performing the method is also disclosed. | ||||||
| 156 | Thermal reclaimer apparatus for a thermal sand reclamation system | US369334 | 1982-04-16 | US4429642A | 1984-02-07 | Vagn Deve |
| A thermal reclaimer apparatus (14) for thermally removing from the used foundry sand the organic matter that is present therein. The subject thermal reclaimer apparatus (14) includes chamber means (26) in which the used foundry sand is heated to a predetermined temperature for a preestablished period in order to accomplish the burning away of the organic matter that the used foundry sand contains. The chamber means (26) includes inlet means (32) provided at one end thereof and outlet means (50) provided at the other end thereof. Feed means (34) are cooperatively associated with the pipe means (36) and thereby with the inlet means (32) for feeding the used foundry sand through the inlet means (32) into the chamber means (26). The subject thermal reclaimer apparatus (14) further includes rotating means (44) operative for effecting the rotation of the chamber means (26) as the used foundry sand is being heated therein. The chamber means (26) has cooperatively associated therewith burner means (40) located at the same end thereof as the outlet means (50). The burner means (40) is operative to effect the heating of the used foundry sand to the desired temperature within the chamber means (26). Tumbling means (46, 48) are provided inside the chamber means (26) to ensure that the used foundry sand is constantly turned over, i.e., tumbled, and that the lumps therein are broken up as the chamber means (26) rotates. Lastly, the used foundry sand from which the organic matter has been removed leaves the chamber means (26) through the outlet means (50). | ||||||
| 157 | Method of fixing hazardous substances in waste foundry sand | US301459 | 1981-09-14 | US4408985A | 1983-10-11 | Mark A. Anderson; Robert W. Balliett; Paul E. Link; Donald P. Satchell |
| A method is disclosed for fixing certain dangerous substances into recyclable waste foundry sand so that they are less likely to leach out into the environment. The method uses a roasting process which causes the dangerous substances to form insoluble compounds with the sand. One example is shown where hazardous waste foundry sand which contains acetic acid soluble lead contamination is treated by this method. In this example the lead is believed to react with the sand during the roasting process forming compounds such as lead silicate which are insoluble to acetic acid. The amount of lead which may be leached out into the environment is reduced to a safe level according to the currently accepted test methods promulgated by the U.S. Environmental Protection Agency. The method may be applied to the conversion of waste foundry sand into reusable sand or landfill which are less likely to leach dangerous substances into the environment. | ||||||
| 158 | Method and apparatus for extracting heat from a powdered water-absorbant substance at less than 100.degree. C. | US299251 | 1981-09-03 | US4377937A | 1983-03-29 | Serge Alquier; Louis Berthod |
| Spray nozzles (16, 18, 20) inject just sufficient water to produce the desired cooling of hot powdered substance by evaporation of the water. The water is sprayed finely and uniformly onto said substance to avoid wet lumps agglomerating. The substance comes from a hopper (2), and flows through the apparatus in the opposite direction to a drying gas flow from inlet (21) to a condenser (22) where the heat is recovered from the water vapor.Application to recycling foundry sand and, more generably, to using sand which has been heated. | ||||||
| 159 | Cooling method | US155911 | 1980-06-03 | US4334574A | 1982-06-15 | Andrew L. Rennie; Alexander Davis |
| Moulds are made from refractory sand (or other particulate or granular material) obtained from that sand or material. In order to control the temperature of the sand used to form the new moulds, the sand is heat exchanged with a permanent gas in liquid or solid state, or the cold vapour thereof. The temperature of the sand is sensed. The heat exchange is controlled so as to keep the sensed temperature at or below a chosen maximum. | ||||||
| 160 | Method for purifying particulate mould material | US879868 | 1978-02-21 | US4203777A | 1980-05-20 | Hermann Jacob |
| Method for purifying foundry sand which involves the passage of sand through layers of steel wool supported on perforated discs mounted on a vertical shaft in a standpipe. Perforations in the sides of the standpipe permit air to be blown through the sand as it drops down through the steel wool. The vertical shaft supporting the discs and steel wool is vibrated to cause the sand to move through and past the packs of steel wool. | ||||||
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