EP1294506B1 - Verfahren und vorrichtung zur aufbereitung von formsand - Google Patents

Verfahren und vorrichtung zur aufbereitung von formsand Download PDF

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Publication number
EP1294506B1
EP1294506B1 EP01984030A EP01984030A EP1294506B1 EP 1294506 B1 EP1294506 B1 EP 1294506B1 EP 01984030 A EP01984030 A EP 01984030A EP 01984030 A EP01984030 A EP 01984030A EP 1294506 B1 EP1294506 B1 EP 1294506B1
Authority
EP
European Patent Office
Prior art keywords
mixer
mixing
feeder
pressure
mixture
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
EP01984030A
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German (de)
English (en)
French (fr)
Other versions
EP1294506A1 (de
Inventor
Uwe Greissing
Dieter Adelmann
Paul Eirich
Herbert Dürr
Winfried Diem
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.)
Maschinenfabrik Gustav Eirich GmbH and Co KG
Original Assignee
Maschinenfabrik Gustav Eirich GmbH and Co KG
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Filing date
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Publication of EP1294506A1 publication Critical patent/EP1294506A1/de
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Publication of EP1294506B1 publication Critical patent/EP1294506B1/de
Anticipated expiration legal-status Critical
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Classifications

    • 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
    • B22C5/044—Devices having a vertical stirrer shaft in a fixed receptacle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/50—Mixing liquids with solids
    • B01F23/54—Mixing liquids with solids wetting solids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/21—Mixers with rotary stirring devices in fixed receptacles; Kneaders characterised by their rotating shafts
    • B01F27/2122—Hollow shafts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/71—Feed mechanisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/71—Feed mechanisms
    • B01F35/712—Feed mechanisms for feeding fluids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/71—Feed mechanisms
    • B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
    • B01F35/718—Feed mechanisms characterised by the means for feeding the components to the mixer using vacuum, under pressure in a closed receptacle or circuit system
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/71—Feed mechanisms
    • B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
    • B01F35/71805—Feed mechanisms characterised by the means for feeding the components to the mixer using valves, gates, orifices or openings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/71—Feed mechanisms
    • B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
    • B01F35/7181—Feed mechanisms characterised by the means for feeding the components to the mixer using fans or turbines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/80—Forming a predetermined ratio of the substances to be mixed
    • B01F35/88—Forming a predetermined ratio of the substances to be mixed by feeding the materials batchwise
    • B01F35/881—Forming a predetermined ratio of the substances to be mixed by feeding the materials batchwise by weighing, e.g. with automatic discharge
    • 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
    • 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
    • B22C5/18—Plants for preparing mould materials
    • B22C5/185—Plants for preparing mould materials comprising a wet reclamation step
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/112—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades
    • B01F27/1121—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades pin-shaped
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
    • B01F33/70—Mixers specially adapted for working at sub- or super-atmospheric pressure, e.g. combined with de-foaming
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/71—Feed mechanisms
    • B01F35/715—Feeding the components in several steps, e.g. successive steps

Definitions

  • the present invention relates to a method and a device for the treatment of foundry sand by a mixing process in a mixer, wherein the treatment takes place at least partially under vacuum.
  • the preparation of sand for the production of molds has the goal to produce the correct mixing ratio of the grain sizes and the ratio of proportions of quartz sand, binder, coal dust, possibly other additives and old and new sand, to homogenize the mixture while the grain with To coat the binder largely to adjust the correct moisture content, adjust the correct temperature of the molding sand and finally promote the finished processed sand to the consumer points.
  • the used sand has an elevated temperature of, for example, between 100 ° C and 140 ° C. Since sand temperatures above about 50 ° C can cause great problems for the molding machine and at too high temperatures due to uncontrollable evaporation losses on the route between mixer and molding plant moisture fluctuations in the finished sand, the sand must be cooled in this case. In most cases, fluid bed coolers are used, which the sand continuously passes through oscillating or touching movements of a sieve grate.
  • a mixer lid is provided in all known embodiments, which must be vacuum-tight in the closed state to allow the vacuum operation, and which is opened for the purpose of loading the mixer.
  • the cover is generally pivotally connected to the mixer at a pivot axis.
  • the lid may be configured to pivot outwardly or inwardly to open the container. If it is pivoted inwards, the closing mechanism must press the cover with considerable force outwards against the sealing surface of the mixer during vacuum operation. To be able to produce the closing mechanism economically, therefore, the mixer cover must be very small, since then the force which must be applied by the closing mechanism is also small.
  • the locking mechanism can be made weaker and therefore cheaper to manufacture, since the necessary contact pressure is generated solely by the pressure difference between the mixing vessel and the environment. In this embodiment, however, care must be taken constructively that above the lid enough pivoting space remains, so that the lid can be opened without bumping against any objects. Therefore, dosing funnels or other dosing devices must be installed at a suitable distance above the mixer opening. The distance necessarily increases with the enlargement of the lid. When filling the mixer, however, make sure that the sealing surface of the feed opening is not contaminated as possible to ensure a vacuum-tight closability.
  • the DE 29 52 403 describes a method and an apparatus for processing, in particular cooling and mixing of foundry sand.
  • the EP 0 736 349 also shows a foundry sand cooling device.
  • the present invention is therefore an object of the invention to provide a method and apparatus for processing foundry sand, which are inexpensive to use and apply trouble-free, and also provide molding sand of uniform temperature and uniformly high quality economically and compared to the known mixers has an increased feed rate.
  • the pressure difference between ambient pressure and the pressure in a mixing chamber of the mixer is used either as a sole or predominant drive for at least one introduction of water or a Mischgut suitsteils or to accelerate the Einbringvorgangs.
  • the quality-determining components of the mix are the already mentioned additives, such as bentonite, coal dust, etc., which are added to the used sand in order to adjust the quality of the processed molding sand.
  • the fact that the negative pressure in the mixer is used to suck in the ingredients to be filled, is effectively prevented that dusty Mischgut confuseer emerge from the mixer and deposit, for example, on sensitive machine parts.
  • a particularly expedient embodiment of the method according to the invention additionally provides that the individual Mischgut saucker be introduced in a predetermined order successively in the mixer.
  • the water is first introduced into the mixer after the other Mischgut Anlagenmaschinener have been introduced substantially simultaneously in the mixer. This makes it possible, after the other Mischgut garmaschinener were introduced to determine the residual moisture and the temperature of the used sand and to calculate the appropriate amount of water to be added.
  • a preferred embodiment of the method provides that at least a portion of the supplied water is introduced by means of a preferably rotating feed directly into the mix.
  • rotating here is understood to rotate with respect to the mixer, so that it is irrelevant whether the feeder rotates or the feeder stands still and the mixer rotates about the stationary feeder, or whether both mixer and feeder rotate.
  • a particularly effective embodiment of the method provides that at least a portion of the water is introduced via a feed device into the mix, which is coupled to a mixing tool or even integrated into a mixing tool. This is particularly advantageous when a mixing tool is provided in the mixer anyway.
  • the water can be mixed directly with the contents by this process step.
  • the quality-determining Mischgut considerably are preferably introduced centrally and directly within the vertically and tangentially flowing Mischgutbettes. This increases the miscibility even further.
  • the quality-determining Mischgut ister is first mixed with air, and this air-solid mixture is then introduced into the mixer, preferably below the Gregutaciouss.
  • the mixer must be re-aerated, that is, there must be a pressure equalization between mixing tank and ambient pressure. This is possible, for example, simply by opening the container lid.
  • particularly preferred is a method in which the aeration of the mixing chamber via a feed takes place, which ends in the mixing chamber below the Mischgut Stahls. As a result, there is less compaction of the molding sand.
  • the compensating air is supplied above the sand layer, then a type of pressure pad forms on the sand surface due to the then prevailing pressure difference above and below the filling material, which leads to a significant temporary compression of at least the uppermost sand layer.
  • the object mentioned is achieved by a device for processing molding sand with a mixer having the features of claim 13.
  • the feed opening may, in principle, have any cross-sectional shape, but round or square shapes are preferred.
  • the pressure difference between ambient pressure and the pressure in the mixing chamber of the mixer can be utilized as a driving force. If the feed connection is opened, feed material is drawn from the outside into the mixing container due to the negative pressure existing in the mixing chamber. For this purpose, no additional pump is generally required. The feeder therefore requires no additional energy and is also essentially maintenance-free.
  • a substantially vacuum-tight closable filling opening of the mixer via a substantially vacuum-tight gap with the outlet opening of at least one metering device, which is preferably designed as a metering scale, is connectable.
  • old sand can be introduced into the mixer through this opening.
  • the mixer must first be placed under vacuum. Thereafter, the filling opening of the mixer is opened, so that the mixing chamber is connected to the substantially vacuum-tight gap. Thereafter, the exhaust port of at least one supply device is opened, so that the feed materials of the supply device are first passed into the intermediate space and then into the mixing chamber. This charging takes place very quickly, since the pressure in the mixing chamber of the mixer and in the intermediate space is significantly lower than the pressure in the feeding device.
  • both the filling opening of the mixer and the discharge opening of the feeding device have a lid with lateral cheeks, which thereby form a transfer chute in the opened state.
  • a further movable chute part is provided, which is movable independently of one of the lid. Then, preferably by a control device for the purpose of supplying first the lid of the filling opening of the mixer are opened, then the movable chute part are brought into a functional position and finally the lid of the feeder are opened.
  • the three chutes are then preferably arranged so that they form a discharge passage for the contents and ensure a fast and targeted loading of the mixer with the contents.
  • the chutes are then preferably arranged so that they protrude into the openings and thereby prevent exposure of the opening edges with Gugutmaterialien. Such loading could possibly affect the sealing function of the lid of the filling opening of the mixer.
  • a particularly preferred embodiment of the device according to the invention provides that the mixing chamber of the mixer is arranged in a pressure vessel and that within the pressure vessel, but outside the mixing chamber, a closable air supply is provided.
  • the pressure vessel is advantageously connected via suitable seals with the arranged in the pressure vessel mixing chamber. These seals inevitably allow air through, but should hold the Mischgut felter as possible in the mixing chamber. It is not desirable that mixed material from the mixing chamber enters the pressure vessel, as it can lead to contamination of the seals and moving drive parts and bearings. If now a rapid loading of the mixing chamber without vacuum with the contents made, the pressure in the mixing chamber increases very quickly. However, the generally used seals between the mixing chamber and the pressure vessel are not able to maintain their sealing function with such an abrupt pressure rise.
  • the pressure in the pressure vessel outside the mixing chamber can be increased during the charging process by the air supply, so that the pressure in the pressure vessel is higher than the pressure in the mixing chamber. In this way, a passage of material from the mixing chamber is prevented in the pressure chamber.
  • a controller which opens the air supply when Mischgut ashamedmaschine be supplied and the air supply closes when the vacuum container is sealed vacuum-tight.
  • This control is preferably automated, so that depending on the process step both an evacuation of the pressure vessel is possible and a pressure build-up in the pressure vessel to counteract an abrupt increase in pressure in the mixing chamber due to the supply of Mischgut staggering kind.
  • the air supply described outside the mixing chamber can be used within the vacuum chamber in known mixers. Even if the known mixers do not use the pressure difference between the pressure chamber and the environment as a driving force and therefore the abrupt increase in pressure due to the charging process significantly lower, but also in the known mixing vessels, a passage of material from the mixing chamber is prevented in the pressure chamber.
  • a further particularly preferred embodiment of the present invention provides that a supply device for water is arranged such that the water is passed through or along a preferably eccentrically arranged mixing tool with mixing blades and is supplied to the mix substantially in the region of the mixing blade ends.
  • a supply device for water is arranged such that the water is passed through or along a preferably eccentrically arranged mixing tool with mixing blades and is supplied to the mix substantially in the region of the mixing blade ends.
  • the pressure difference between the mixing chamber and the external environment is exploited according to the invention. If water is to be supplied to the mix, so only one valve must be opened. By prevailing in the mixing chamber vacuum, the water is sucked by the feeder directly into the mix.
  • the arrangement of the feeder along a mixing tool has the advantage that the water can be fed directly at different locations in the mix.
  • the liquid outlet openings in the water supply device are preferably arranged at different depths below the Mischgutspiegels. As a result, a sufficient mixing can be achieved extremely quickly.
  • the feed device for water to a dosing wherein dosing and mixer are connected to a, preferably at least partially elastic, line which can be closed by a valve, wherein the valve is preferably arranged on the lid of the mixer.
  • the so-called quality-determining Mischgut saucker are preferably supplied with the help of a Buchabelanze possible below the Mischgutapts.
  • the outlet opening of the Werneranze is aligned as tangential to the flow direction of the mix and preferably shows in the flow direction. This ensures that the quality of the Mischgut maybe, which are sucked due to the pressure prevailing in the mixing chamber vacuum in the mixing chamber, are entrained in the flow direction with the mix by the flow of the mix, highlighted by the rotation of the mix and quickly and effectively mixed with this become.
  • FIGS. 1a) and 1b the outlet region of a solids balance 10 and the inlet region of the mixer 1 is shown.
  • the solids balance 10 serves to determine the quantity of the used sand to be supplied or optionally also other components of the mixture.
  • Both mixer 1 and solid scale 10 are closed while in Fig. 1b ) the transfer position between mixer 1 and solid scale 10 is shown.
  • an inlet connection 2 is arranged on the top of the mixer 1, on the top of the mixer 1, an inlet connection 2 is arranged.
  • This inlet neck 2 is closed by the container lid 3 by means of the lever arm 5, which is driven for example with a hydraulic cylinder, vacuum-tight.
  • the container lid 3 has a side cheek 4 at its two lateral outer edges.
  • the solids balance 10 also has an outlet flap 11 which has side cheeks 11 'at its two lateral outer edges. This flap is opened or closed via the lever 12.
  • this embodiment has a Kochleitschurre 13.
  • the Kochleitschurre 13 has at its two lateral outer edges side cheeks 13 '.
  • the Kochleitschurre 13 can be moved by means of the parallel guide 14 and the lifting drive 15 in the space between solids balance 10 and mixer 1.
  • By the side cheeks have outlet flap 11, filler flap 3 and
  • Studentsleitschurre 13 has a substantially U-shaped cross section, wherein the side cheeks form the two U-legs.
  • the Matterleitschurre 13 is arranged such that it in the extended position, when the outlet cover 11 of the solids balance 10 is opened, together with the outlet flap 11 and the side walls 11 ', 14' form a channel having a substantially quadrangular cross-section.
  • the entire range of movement of the flaps 3, 11 and the Kochleitschurre 13 is surrounded by a housing 6 and 6 '.
  • the housing is designed in two parts in the embodiment shown; and the two housing parts 6, 6 'are connected to each other via a flexible, preferably sealing compound 7.
  • the loading process is now as follows. First, the two covers 3, 11 of the mixer 1 and the solids balance 10 are closed. If now the mixer with the materials that are in the solid scale 10 are charged, so the lid 3 of the mixer 1 is first opened. Next, the transfer chute 13 is moved into the area between solids balance 10 and mixer 1. This is not possible before because the Kochleitschurre 13 is in the extended state in the pivoting range of the filler cap 3 of the mixer 1. Now, if the outlet flap 11 of the solids balance 10 is opened, the materials from the solids balance are filled directly and quickly into the mixing chamber of the mixer 1 via the channel formed by the outlet flap 11, inlet cover 3 and Kochleitschurre 13. The molding sand from the solid scale 10 arrives in this way without significant loss of material and without substantial dust discharge in a large cross-section in a short time in the mixer first
  • air nozzles 8.9 are additionally arranged in the housing 6, 6 ', which direct an air flow to the seal of the inlet cover 3 and the movement mechanics of the inlet cover 3 so that after each filling process those points are blown off which could make negatively noticeable sand deposition to ensure a safe and tight closing of the inlet cover 3.
  • the inlet cover 3 of the mixer 1 according to the invention has no special elaborately designed sealing elements. Instead, it is simply pressed by the negative pressure prevailing in the mixer 1 against the opening of the mixer 1, so that the opening or the lid 3 should be surrounded only by a sealing ring.
  • this embodiment of the inlet cover 3 inevitably includes a certain distance between solids balance 10 and mixer 1, since the lid 3 needs enough space to pivot. This distance, as stated, by the material guide channel, which is formed from the flaps 3, 11 and the transfer chute 13 and the side cheeks 4, 11 ', 13' bridged.
  • the charging time of such a mixer of about 30-40 seconds, as is quite common in the market on the market mixers, shortened to less than 10 seconds.
  • the mixing chamber 16 of a vacuum mixer 1 is arranged in a vacuum chamber 17.
  • the basic structure can the FIG. 2 and in more detail the FIG. 3 be removed.
  • the vacuum chamber 17 is sealed by flexible seals 18 against the mixing chamber 16.
  • the seal 18 only serves to prevent the entry of mix from the mixing chamber 16 into the vacuum chamber 17.
  • the drive unit for the mixer is generally arranged in the vacuum chamber 17 but outside the mixing chamber 16. For this reason, the reliable function of the seal 18 is very important, since otherwise the gap 17 must be cleaned frequently, otherwise the destruction of the drive due to solid mix materials is possible.
  • the charging phase is a very critical moment for the seal 18. Due to the filling process, there is already an abrupt increase in pressure in the conventional mixers, so that functional failure of the seal 18 repeatedly occurs.
  • an embodiment of the invention provides a closable air supply 19.
  • This air supply which in the Figures 2 and 3 is designed as a pressure fan, is able to increase the beginning of the charging process, the pressure in the gap 17.
  • the pressure increase in the intermediate chamber 17 should correspond approximately to or even exceed the abrupt increase in pressure in the mixing chamber 16.
  • FIG. 3 are constructive detail of the seal 18 can be seen.
  • the valve 21 is opened, so that the pressure fan 19 introduces air into the gap 17 between the pressure chamber wall 17 'and the mixing chamber wall 16'.
  • the introduced air flows in the direction of arrow through the gap seals 18, 22 in the mixing chamber 16.
  • the air supply is not necessarily a pressure blower 19 or similar device requires, it may be sufficient for some applications, when only a closable opening is provided as an air supply, which is easily opened at the beginning of the charging process, so that the pressure in the Vacuum chamber or the intermediate space 17 and the mixing chamber 16 increases approximately synchronously.
  • FIGS. 4a) and 4b shows the feed of the mixer with the required amount of mixing water.
  • the exact amount of water to be supplied is determined by measuring the residual moisture of the used sand in front of the mixer or even in the mixer.
  • the residual moisture of the used sand and thus the amount of mixing water still to be added depends on the thermal preload of the used sand.
  • FIG. 4a a conventional arrangement is shown. Shown is a weighing container 25, which is suspended via a support structure 24 to a load cell 23.
  • the load cell 23 determines the weight of the weighing container 25 including support structure and water filling.
  • water leaves the weighing container 25 via an outlet pipe 27 and runs into an inlet pipe 30.
  • the inlet pipe 29 is firmly connected to the pressure vessel of the mixer.
  • Inlet pipe 30 and outlet pipe 27 are suitably surrounded by a pressure-resistant but flexible sleeve 29. So that the addition can be done very quickly with water, the water is withdrawn from the weighing container 25 and determines the amount of the weight loss, which is detected via the load cell 23.
  • the pressure difference between the mixing chamber and the environment or in this case the weighing container 25 in order to accelerate the feed significantly is possible, for example, that similar to that in connection with the FIGS. 1 and 2 described form sand feed, the supply of mixing water takes place while the mixing container is under vacuum. But this is with the in FIG. 4a ) arrangement only possible under the assumption of other disadvantages.
  • valve 26 is not disposed on or in the outlet pipe 26, but in or on the inlet pipe 30.
  • the sleeve 29 is necessarily above the valve 26 and not as in conventional systems below the valve 26.
  • this arrangement also has the advantage that the falsifying influence of the mixing chamber pressure on the load cell 23 occurs only during the valve opening and on the other hand, the pressure acts only on the much smaller cross-section d 'of the discharge pipe to the load cell 23.
  • the weighing container 25 can be filled reliably with the valve 26 closed with the desired amount.
  • the weighing error during the open valve can be easily corrected by a tara correction.
  • the tara correction can take place with the aid of the dosing computer 31 and the pressure gauge 33.
  • the pressure gauge 33 detects the current pressure in the mixing chamber and passes this value to the metering computer 31 on.
  • the metering calculator 31 calculates the force exerted by the mixing chamber on the load cell 23 tensile force and corrects the weighing result, so that mixing water can be dosed very accurately.
  • the filling time can be greatly reduced.
  • the cross section d 'of the outlet pipe can be reduced, so that the distorting influence of the tensile force is further reduced.
  • the filling speed is forcibly increased, this is more than compensated by the vacuum filling.
  • the introduction of the mixing water under vacuum has the additional advantage that the water is immediately dispersed and spreads like mist in the mixing chamber.
  • a mixing shaft 34 is provided with mixing tools 35.
  • the mixing shaft 34 is held outside the container in a bearing 32.
  • Above the bearing a rotary joint 31 is connected to the inlet pipe 30.
  • the from a metering device, preferably from in connection with FIG. 4b ), flowing in the direction of arrow water is passed via the rotary joint 31 in the longitudinal bore 33 of the mixing shaft 34.
  • the longitudinal bore 33 is connected at different heights with pipes or hoses 36 with outlet nozzles 37.
  • the water Due to the prevailing in the mixing vessel vacuum, the water is sucked through the described supply and distribution system directly into the mix without pumps or other conveyor are necessary.
  • the inventive method even allows the processing of recycled condensed water from a heat exchanger system of the vacuum cooling process.
  • the condensate is generally contaminated with fines, so that the feed of this water in the use of pumps or conventional nozzles is out of the question, since the fines wear a pump very quickly and the nozzles are often clogged.
  • this water can be directly reused without a prior consuming purification process.
  • FIG. 6 An alternative embodiment of the present invention is in FIG. 6 shown.
  • powdery additives are exploited by taking advantage of the pressure difference (principle of Saug Corporation) between mixing tank and environment with success.
  • the disadvantages described are overcome by supplying the powdery additives with the aid of a preferably stationary mixing tool 39 or its support arm 41.
  • the stationary mixing tool 39 serves primarily for material diversion. Because of in the FIG. 6 As shown, the mixing tool 39 additionally assumes the function of cleaning the container wall of the mixer 1.
  • the mixer 1 or the mixing chamber rotates in the FIG. 6 looking from above, counterclockwise.
  • the mixing tool scrapes along the container wall and cleans them of unmixed Mischgut knew kind.
  • the mixing tool directs the mix from the edge of the container to the center of the container 1.
  • the mixing tool 39 is fixed by means of a support arm 41.
  • the support arm 41 is hollow, so that powdery additives, the amount of which was determined by means of the metering 43, can be guided via the feed 42 into the cavity 40 of the support arm. Due to the pressure difference between the mixing container and the environment, the additives are sucked into the mixing chamber.
  • the cavity 40 is connected to a feed nozzle 45, whose outlet opening is arranged so that the sucked additives are guided as far as possible radially inwards.
  • the suction which forms following the mixing tool 39 from.
  • the mixing tool 39 in the vicinity of the bottom even on an extended portion 39 ', which is arranged in the flow direction of the mix substantially directly in front of the outlet opening of the feed nozzle 45.
  • the additives can be supplied simply and inexpensively.
  • the mixing is very effective and, above all, speedy.
  • the hollow tool designed for the supply of additives can advantageously also for ventilation, d. H. be used for pressure equalization, the mixing vessel when the vacuum cooling process is completed.
  • air is simply sucked through the feed 44 into the mixing container.
  • the supply of air directly into the mix, d. H. below the Mischguttik, has the great advantage that the mix is not temporarily compressed due to the pressure wave occurring, as is the case with the conventional mixers, but the air can be mixed into the mix.
  • FIG. 7 an alternative embodiment of the feed opening of the mixer 1 is shown.
  • the mixer 1 has no lid in this embodiment. It is only one, the filling opening surrounding, pressure-resistant, rigid transfer funnels 46 is provided. Above the transfer funnel a likewise pressure-resistant but movable housing 47 is provided that is connected via a pressure-resistant, flexible connection 48 with the transfer funnel 46.
  • the weighing container 49 serves to meter the mixture to be added. From the weight of the weighing container 49, which is determined via the load cell 51, can be deduced on the capacity.
  • the weighing container 49 has at its lower end a pressure-tight closure cap 11 which can be opened and closed via an actuating lever 52.
  • closing brackets 51 are provided, which serves for the vacuum-tight holding of the closure cap on the weighing container 49.
  • This embodiment allows the addition of the mixture under vacuum.
  • the filling process is as follows. First, the cap 11 of the weighing container 49 is closed. The mixing container 1 is evacuated, so that even within the transfer funnel 46 and the pressure-resistant housing 47 negative pressure prevails. Now, the mix is filled in the weighing container 49 and determines the capacity of the pressure transducer 50. When determining the filling amount, it should be noted that the pressure difference between the housing 47 and the interior of the weighing container 49 falsifies the weighing via the load cells 50. This must be taken into account when calculating the net weight.
  • the weighing container 49 as well as the housing 47 permanently connected to the weighing container can easily shift in the vertical direction, depending on the filling weight and the pressure difference. This vertical movement is achieved by the flexible connection 48, which in FIG. 7 clearly shown on the left in the detail enlargement.
  • the closing brackets 51 which clamp around the cap are pivoted outwardly about the axis 53, as in FIG. 7 can be seen in the right detail view.
  • the cap is thus unlocked and can now be opened by means of the actuating lever 52.
  • the pressure difference between the solids balance and the mixing tank in combination with the large feed opening ensures a rapid feed.
  • a cover including the necessary drive can be saved by this embodiment, a cover including the necessary drive.
  • a smaller height is necessary because the pivoting range for the mixing chamber lid is not needed, and the closure cap of the solid scale can be formed so that it dips into the transfer funnel or even into the mixing container opening during opening.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Dispersion Chemistry (AREA)
  • Accessories For Mixers (AREA)
  • Mixers With Rotating Receptacles And Mixers With Vibration Mechanisms (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
EP01984030A 2000-06-23 2001-06-16 Verfahren und vorrichtung zur aufbereitung von formsand Expired - Lifetime EP1294506B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10030675 2000-06-23
DE10030675A DE10030675A1 (de) 2000-06-23 2000-06-23 Verfahren und Vorrichtung zur Aufbereitung von Formsand
PCT/DE2001/002259 WO2001098001A1 (de) 2000-06-23 2001-06-16 Verfahren und vorrichtung zur aufbereitung von formsand

Publications (2)

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EP1294506A1 EP1294506A1 (de) 2003-03-26
EP1294506B1 true EP1294506B1 (de) 2008-08-06

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US (1) US6860313B2 (cs)
EP (1) EP1294506B1 (cs)
JP (1) JP5173104B2 (cs)
CN (1) CN1231316C (cs)
AU (1) AU2002215483A1 (cs)
CZ (1) CZ304626B6 (cs)
DE (2) DE10030675A1 (cs)
DK (1) DK1294506T3 (cs)
ES (1) ES2311554T3 (cs)
PL (1) PL197428B1 (cs)
WO (1) WO2001098001A1 (cs)

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DE19945569A1 (de) * 1999-09-23 2001-03-29 Eirich Maschf Gustav Verfahren zur Aufbereitung von Gießereiformsand und Vorrichtung hierfür
CN1319669C (zh) * 2005-12-20 2007-06-06 金啸海 一种用于铸造的型砂及其制备方法
DE102010027885A1 (de) * 2010-04-16 2012-02-09 Maschinenfabrik Gustav Eirich Gmbh & Co. Kg Mischvorrichtung mit Verschleißschutzauskleidung
WO2012115984A2 (en) 2011-02-21 2012-08-30 Felice Kristopher M Polyurethane dispersions and methods of making and using same
RU2478020C2 (ru) * 2011-05-24 2013-03-27 Закрытое Акционерное Общество "Литаформ" Способ приготовления формовочной смеси и устройство для приготовления формовочной смеси
JP2014520008A (ja) 2011-06-10 2014-08-21 フェリス、クリストファー、エム． 透明アクリルコーティング
CN105170899B (zh) * 2015-10-12 2017-10-13 嘉善县汾湖铸钢厂 一种筒式混砂设备
CN106141080A (zh) * 2016-05-20 2016-11-23 许云东 一种滚筒式混砂机及其混砂方法
DE102017104842A1 (de) * 2017-03-08 2018-09-13 Maschinenfabrik Gustav Eirich Gmbh & Co. Kg Mischer mit Reinigungsdüse
CN109530613B (zh) * 2018-12-05 2023-09-19 常州好迪机械有限公司 一种混砂装置使用方法
US11771265B2 (en) 2019-03-08 2023-10-03 Sharkninja Operating Llc Vacuum food processing system
CA3123912A1 (en) 2019-03-08 2020-09-17 Sharkninja Operating Llc Vacuum food processing system
CN212939453U (zh) 2019-03-08 2021-04-13 沙克忍者运营有限责任公司 食品处理系统、用于其的容器组合件及与其一起使用的附件
USD924007S1 (en) 2019-06-06 2021-07-06 Sharkninja Operating Llc Strainer blender accessory
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USD925270S1 (en) 2019-06-06 2021-07-20 Sharkninja Operating Llc Blender
CN116983894B (zh) * 2023-09-25 2023-12-08 山西大丰新材料科技有限公司 一种涂料生产用的稀释装置及其使用方法

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AU2002215483A1 (en) 2002-01-02
DE10030675A1 (de) 2002-01-03
JP5173104B2 (ja) 2013-03-27
PL358228A1 (en) 2004-08-09
DK1294506T3 (da) 2008-12-01
EP1294506A1 (de) 2003-03-26
US20040020623A1 (en) 2004-02-05
WO2001098001A1 (de) 2001-12-27
CZ304626B6 (cs) 2014-08-13
CN1437514A (zh) 2003-08-20
US6860313B2 (en) 2005-03-01
ES2311554T3 (es) 2009-02-16
PL197428B1 (pl) 2008-03-31
DE50114195D1 (de) 2008-09-18
JP2003535700A (ja) 2003-12-02
CN1231316C (zh) 2005-12-14

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