EP0519324B1 - Sandverfeinerungsvorrichtung - Google Patents

Sandverfeinerungsvorrichtung Download PDF

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Publication number
EP0519324B1
EP0519324B1 EP92109829A EP92109829A EP0519324B1 EP 0519324 B1 EP0519324 B1 EP 0519324B1 EP 92109829 A EP92109829 A EP 92109829A EP 92109829 A EP92109829 A EP 92109829A EP 0519324 B1 EP0519324 B1 EP 0519324B1
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EP
European Patent Office
Prior art keywords
sand
refining
sand particles
bed
elements
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
EP92109829A
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German (de)
English (en)
French (fr)
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EP0519324A1 (de
Inventor
Hans Ing. Grad. Weisskopf
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.)
Heinrich Wagner Sinto Maschinenfabrik GmbH
Original Assignee
Heinrich Wagner Sinto Maschinenfabrik GmbH
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Application filed by Heinrich Wagner Sinto Maschinenfabrik GmbH filed Critical Heinrich Wagner Sinto Maschinenfabrik GmbH
Priority to DE9218171U priority Critical patent/DE9218171U1/de
Publication of EP0519324A1 publication Critical patent/EP0519324A1/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B3/00—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements
    • B05B3/02—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
    • B22C5/04—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by grinding, blending, mixing, kneading, or stirring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
    • B22C5/12—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose for filling flasks
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S241/00—Solid material comminution or disintegration
    • Y10S241/10—Foundry sand treatment

Definitions

  • the invention relates to a device for the extraction of comminuted model sand particles for the production of a casting mold from a body in metal foundry technology, comprising a feed device with which tuber-shaped molding sand can be presented to a refiner in a refining device, the feeding device containing tuberous molding sand as a sand bed for the refiner
  • the refiner has a multiplicity of refinement elements arranged on a carrier, which move in an orbit running transversely to the feed direction of the sand bed and thereby remove comminuted model sand particles from the sand bed, and wherein the refiner with its refinement elements, the removed model sand particles in a jet of comminuted Emits model sand particles.
  • mixers In foundries, the so-called green sand molding sands are usually reprocessed in mixers. These mixers normally operate on the roller system with rollers or with turbine-like whirlers and even with both systems.
  • the molding sand prepared in this way often does not yet meet the demands of the molding shop, so that the molding sand is then spun. Despite this procedure, molding sand treated in this way still contains tubers.
  • a molding sand with tubers is not suitable for the production of fine-contoured filigree casting molds, since it cannot be used to produce sharp-contoured casting molds. It is therefore still necessary to further crush this molding sand containing tubers.
  • Model sand particles are particles which comprise a quartz sand grain covered with clay or an agglomeration of several quartz sand grains each covered with clay and have, for example in the fine state, an average diameter of less than 1 mm or even better less than 0.5 mm, with grain sizes of the quartz sand grains of 0 , 04 to 0.4 mm.
  • the invention is therefore based on the object of providing a device which allows finely comminuted model sand particles to be obtained from molded sand which is normally produced and has tubers.
  • This object is achieved according to the invention in a device of the type described in the introduction in that the refinement elements are arranged on the carrier with such spaces in order to obtain a jet of finely comminuted and lump-free model sand particles and are movable in orbit at such a speed that the spaces remain lump-free , and that the device is designed so that this beam hits the body without mechanical deflection.
  • the gaps between the refinement elements can be kept larger than an average size of the tubers, since due to the rapid movement of the refinement elements, tubers from the sand bed prevent penetration of the gaps between these refinement elements can be.
  • the speed at which the refinement elements move in orbit should be variable in order to be able to adapt them to other parameters, it is preferably provided that the refinement elements are arranged on the carrier with spaces that are smaller than an average size of the Are tubers. In this case, if the refinement elements are moved on the orbit at a sufficient speed, the bulbs must be prevented from penetrating into the interstices.
  • the tubers are usually the size of peas or are somewhat larger, it is preferably provided that the refinement elements are arranged with gaps on the carrier which are smaller than 10 mm, it is even better if the gaps are smaller than 5 mm.
  • the refining elements remove sufficient model sand particles from the sand bed
  • the refining elements on their front have removal areas which can be moved with engagement over the sand bed and thereby remove the model sand particles from the sand bed, in particular from the tubers, in the sand bed.
  • the refining elements have the tubers of the molding sand penetrating at their front ends and thereby destroying them.
  • These sections can preferably be produced in that the refining elements are provided, for example, with sharp edges or tips, with which they penetrate into the tubers when they are moved through the sand bed and are therefore able to break up these tubers into model sand particles, which have a model sand particle size which is sufficient for the finely shredded model sand.
  • An embodiment of the refinement elements is particularly preferred in which the removal areas coincide with the sections penetrating into the tubers of the molding sand to destroy the tubers.
  • An advantageous exemplary embodiment provides that the refinement elements extend in a first direction transverse to a direction of movement of the orbit.
  • refinement elements have a dimension that is smaller in a second direction transverse to the first than an average diameter of the tubers.
  • Such a design of the refinement elements is particularly advantageous if they are to be designed in such a way that they are able to penetrate into the tubers in a destructive manner.
  • An advantageous variant provides that the refinement elements of the refiner are arranged with a constant density.
  • Another advantageous solution provides for an arrangement of the refinement elements with variable density, in particular alternating density.
  • the second direction runs parallel to the direction of movement.
  • the dimension of the refinement elements in the second direction corresponds to an integer fraction of an average diameter of the bulbs.
  • refinement elements are oriented in a defined manner relative to their direction of movement, preferably perpendicularly to this, in order to always obtain defined conditions when removing the model sand particles from the sand bed.
  • a preferred variant of the refining elements in the context of the present invention provides that they are bristle-like.
  • a bristle-like design means a variety of cross-sectional variants of the refinement elements. These can have rectangular, round, oval or other cross sections.
  • the refinement elements are bristles of the carrier designed as a bristle carrier.
  • the refiner is designed as a brush or brush roller which can be set in rotation.
  • a rotating brush is particularly preferred, which in the simplest case has bristles arranged with a constant density.
  • the bristles can preferably also be arranged on a helix.
  • a large number of materials are suitable as bristle materials which have a sufficiently high abrasion resistance compared to the model sand. This is, for example, plastic, and metal, in particular steel, is even more advantageous.
  • refinement elements are designed like lamellae. This means that they protrude from the carrier in the manner of lamellae and, with their front edge facing away from the carrier, can be moved along the sand bed in order to remove the model sand particles.
  • a particularly preferred embodiment is one in which the refinement elements are lamellae which protrude from a lamellae carrier, for example a cylinder.
  • refinement elements are made flexibly, in particular from metal, and are therefore less worn.
  • the flexibility of the refinement elements has the advantage that the refinement elements move into a removal position and then back to a starting position when moving along the sand bed, and this is achieved by detaching model sand particles from them and thus preventing the refiner from sticking together.
  • the refinement elements could extend from the carrier with different lengths.
  • an embodiment is particularly preferred in which the refinement elements form with their front ends a uniform surface of the refiner, which surface is fixed relative to the sand bed.
  • This surface of the refiner is expediently a cylindrical surface.
  • the refining device works to a satisfactory extent by removing the model sand particles from the sand bed presented to it.
  • the refiner is designed in such a way that it only removes model sand particles from the sand bed that are smaller than the tubers and thus prevents the refining elements from taking the tubers with them when they move in orbit.
  • the refining device has a gap which is limited on the one hand by a surface of the refiner and through which the refining elements are those from the sand bed Move the removed model sand particles through. This gap creates a possibility of preventing the unwanted entrainment of tubers by the refinement elements.
  • the width of the gap is preferably smaller than an average diameter of the bulbs.
  • the width of the gap is dimensioned such that it corresponds at most to the diameter of the particles desired in the jet of finely ground model sand particles.
  • individual model sand particles each have a different direction of flight in the jet, so that casting shadows are prevented when the model is loaded.
  • the distribution of the individual flight directions in the jet preferably results in a cone-like distribution in which all directions lying within a cone occur.
  • the gap is delimited by the surface of the refiner, but nothing was said about the opposite delimitation of the gap.
  • the gap is delimited by a wall opposite the refiner.
  • the refinement elements of the two refiners being able to move in opposite or preferably in the same direction.
  • the gap ensures that no nodules of the molding sand can be moved through the gap through the refining elements.
  • a "combing" of the refinement elements of adjacent refiners is provided in a further advantageous variant.
  • the feed device has not been specified.
  • a preferred exemplary embodiment provides that the feed device has a metering device in order to present the sand bed in metered form to the refiner.
  • a metered presentation of the sand bed which in this case represents a moving bed, is possible, for example, if the metering device is a conveyor belt.
  • a device for covering bodies arranged on model plates with finely comminuted model sand particles for the production of casting molds in the iron foundry technology comprising a feed device with which tuber-shaped molding sand of a refinement device movable over the body can be presented, according to the invention, in that the refinement device has a refiner which has refinement elements which are movable in an orbit and have the tuber molding sand as a tuber-free jet of model sand particles, that the tuber-free jet has an elongated cross-sectional shape with an essentially constant model sand particle flow density, that the nodular beam is deflection-free - that is, without mechanical deflection - from the refiner into the body and that the refinement Erungs worn in a transverse to the elongated cross-sectional shape distributing direction for evenly applying the finely distributed model sand on the body is movable relative to this.
  • the bodies which are either models for molded casting or models provided with inlaid cooling iron, in particular for chilled cast iron, have an essentially constant layer of finely distributed model sand are covered, which is of particular importance for a subsequent compression of the same with an air pulse or air flow, in order to finally obtain the most accurate possible shape.
  • the refining elements remove bulb-free model sand particles from a sand bed presented to the refiner by the feed device and, when the model sand particles are removed from the sand bed, are arranged on a carrier with such gaps and can be moved in orbit at such a speed that the gaps can be moved stay tuber-free.
  • the object mentioned at the outset is also achieved by a method in which the molding sand having tubers is fed as a sand bed to a refinement device, wherein in the refinement device, refined elements moving in an orbit are removed model sand particles from the sand bed and a jet of model sand particles is formed, according to the invention solved that to cover a large contour changes body with model sand particles, in particular model sand particles made of green sand, in the course of producing a mold for casting, a jet of finely crushed and lump-free model sand particles is generated, and that this beam falls directly on the body without mechanical deflection , so that the body is covered directly with a loose layer of the finely crushed model sand particles.
  • the method is particularly effective when the flight directions of the individual model sand particles are not the same but are different in relation to one another and are, for example, within a cone. This avoids casting shadows when covering the body.
  • the surface quality is only good if the density of the layer after compaction, for example with an air pulse or air flow or with a vibrating table, is essentially constant in order to allow air to escape from the casting mold produced.
  • the method according to the invention is particularly advantageous when the body is a model with applied cooling irons and when the layer of the finely ground model sand particles is applied in such a way that the covering of the cooling irons and the model is essentially contour-accurate.
  • it is preferably the production of chilled cast iron, in which the cooling irons lying on the model must be precisely molded in order, inter alia, to prevent burrs from forming on the later casting, which is caused by the fact that the cooling irons are not precisely shaped by the model sand were.
  • the body is a model, in particular with a filigree contour, in which it is important that the filigree contour is covered with the model sand with a precise contour. This is the case, for example, with conventionally manufactured cast iron parts, in which the highest possible shape and surface quality should be achieved despite the filigree contour.
  • the lump-free model sand particles are scraped off the bulbs by the refining elements.
  • Another alternative or additional possibility of carrying out the method according to the invention provides that the tubers are crushed by penetration of the refining elements into them.
  • the molding sand is moved through the refining elements through a gap which preferably has a gap width which is smaller than an average tuber size.
  • a particularly preferred embodiment of the method according to the invention provides that the lump-free model sand particles are brushed off the sand bed, for example with a rotating brush, in particular a steel brush.
  • the layer is applied with an essentially constant layer thickness.
  • the layer is applied evenly by a relative movement between the body and the jet.
  • FIG. 1 A first exemplary embodiment of an apparatus, designated as a whole by 10, for producing finely comminuted model sand particles, in particular model sand particles made of green sand, for the purpose of directly covering a model 12 with a cooling iron 13 placed thereon, is shown in FIG. 1.
  • this model 12 with the cooling iron 13 placed thereon is arranged on a model plate 14, which in turn lies on a molding machine table 16.
  • the model 12 sits on the model plate 14 with the cooling iron 13, surrounded by a molding box 18 which has an upper opening 20.
  • the device 10 comprises a feed device designated as a whole by 26, which in the simplest case is designed as an inlet chute 28, and supplies the tuber 30 with molding sand in the form of a sand bed 32 to a refining device 34 with a refiner 36.
  • the refiner 36 is designed as a brush roller which has a carrier 38 and bristles, in particular wire bristles, serving as refining elements 40, which preferably protrude perpendicularly from a surface 37 of the carrier 38 in the radial direction 39 and with their outer ends 42 in one Cylinder surface 44 are.
  • the refiner 36 is arranged in such a way that the cylindrical surface 44 runs past a front side 46 of the sand bed 32, in such a way that side edges of the bristles 40 forming a removal area 48 engage with the ends 42 on the front side 46 of the sand bed 32 and model sand particles remove from this.
  • the bristles 40 are dimensioned in the region of their ends 42 so that their extent transversely to the radial direction 39 is smaller than an average diameter of the bulbs 30 in the sand bed 32, so that the ends of the bristles 40 on penetrating into the sand bed 32 whose front side 46 also partially penetrates into the tubers 30 located on the front side 46, blow them up and thereby produce fine comminuted model sand particles.
  • the refiner 36 rotates with a direction of rotation 50 in such a way that the ends 42 pass from top to bottom on the front 46 penetrating into the sand bed 32 and take model sand particles down along the front 46 and then in a jet 52 following the sand bed 32 Dispense finely shredded model sand particles.
  • the bristles 40 thus moving in an orbit are arranged on the carrier 38 and run at such a speed on their orbit that the tuber 30 of the sand bed 32 cannot penetrate into spaces Z between the ends 42 of the bristles 40 and thus also these gaps Z remain bulbous.
  • the slide 28 is pulled so far forward that it runs parallel to the cylinder surface 44 with a front edge 54 and leaves a narrow gap 56 open, which is smaller than an average diameter of the bulbs 30, preferably smaller than the smallest bulb diameter.
  • the gap 56 thus also delimits the sand bed 32 and retains the molding sand having tubers 30, so that the removed model sand particles are moved out of the gap 56 by the action of the bristles 40 circulating in the orbit and emerge from this gap 56 in the form of the jet 52 .
  • the feed device 26 and also the refinement device 34 are arranged in such a way that the model sand particles in the jet 52 fall without deflection into the filling opening 24 of the filling frame 22 and thus also into the opening 20 of the molding box 18 and thereby in free fall cover the model 12 on the model plate 40 and cover it precisely due to the fineness of the model sand particles.
  • the feed device 26 and the refinement device 34 are preferably movable in a longitudinal direction 57, which runs parallel to a side wall of the molding box 18, and extend in a transverse direction 58 running perpendicular to the longitudinal direction 57, which preferably runs parallel to a further side wall of the molding box 18 , so far that the beam 52 has an elongated cross section 60 in the transverse direction 58, which preferably extends in the transverse direction 58 extends in this direction over the entire width of the molding box 18.
  • the model 12 can be coated with a layer 62 of finely ground model sand, the layer 62 according to the invention essentially having a constant layer thickness 64 above the model 12.
  • the refiner 36 is driven by a motor (not shown in FIG. 1) in such a way that the bristles 40 rotate in their orbit at high speed.
  • the refiner 36 is fixed but adjustable relative to the feed device 26 and can be moved together with the feed device 26 in the longitudinal direction 57 via a drive (also not shown in the drawing), so that the gap 56 always has a constant width.
  • a second exemplary embodiment of a device according to the invention designated as a whole by 70, shown in FIG. 2, is provided with the same reference numerals insofar as the same parts are used as in the first exemplary embodiment, so that reference can be made in this regard to the explanations for the first exemplary embodiment.
  • This second exemplary embodiment 70 of the device according to the invention comprises a pair of rails 72 on which a carriage 74 can be moved in the longitudinal direction 57 with rollers 76.
  • the carriage 74 has a carriage frame 78 on which the rollers 76 are mounted are.
  • two conveyor belt drums 80 and 82 are rotatably mounted at a distance from one another on the carriage frame 78, a conveyor belt 84 running over these two conveyor belt drums 80 and 82 and extending between them.
  • the conveyor belt 84 and the conveyor belt drums 80 and 82 which can preferably be driven by a motor 86, form the feed device 26.
  • the sand bed 32 can be applied to an upper run 92 of the conveyor belt 84, which extends from the front conveyor belt drum 82 facing the molding box 18 to the rear conveyor belt drum 80 and in the region of the rear conveyor belt drum 80 is preferably delimited by a deflector 94 standing above the upper run 92.
  • the refiner 36 of the refining device 34 is also rotatably mounted on the carriage frame 78, specifically on a side of the conveyor belt drum 82 facing the molding box 18, over which a section 96 of the conveyor belt 84 facing the molding box 18 runs.
  • the cylindrical surface 44 of the refiner 36 preferably runs at a short distance from the section 96, so that this in turn forms the gap 56 with this section 96.
  • the sand bed 32 can be fed to the refiner 36 in the form of a moving bed, in such a way that the sand bed lying on the upper run 92 extends up to the cylinder surface 44 and with its front side 46 faces the refiner 36, so that this - as described in connection with the first exemplary embodiment - refines the molding sand with the tubers 30 by removing model sand particles in the region of the front side 46, moves these model sand particles through the gap 56 and in shape of the beam 52 falls on the model 12.
  • a motor 98 is provided which drives the refiner 36 directly and allows the bristles 40 of the same to circulate in their orbit at high speed.
  • FIG. 2 works as follows:
  • the carriage 74 In order to apply the sand bed 32 to the upper run 92 of the conveyor belt 84, the carriage 74 is retracted in the longitudinal direction 57 until the front conveyor belt drum 82 is approximately below the discharge opening 88 of the sand bunker 90.
  • the refiner 36 is not driven, but stands still.
  • the conveyor belt 84 is also not driven by the motor 86. Only a carriage drive 100 moves the carriage below the discharge opening 88 of the sand bunker 90 so that the front conveyor belt drum 82 moves away from the discharge opening 88 and the rear conveyor belt drum 80 moves towards it.
  • the sand bed 32 is preferably applied with the same thickness on the upper run 92, which extends in the applied state to the deflector 94, as shown in FIG. 2a.
  • the carriage 74 is now moved by the carriage drive 100 in the longitudinal direction 57 in the direction of the molding box 18 until the gap 56 approximately above the fill opening 24 in the region of a side wall running parallel to the transverse direction 58, in this case the side wall closest to the carriage 74, of the molding box 18.
  • the conveyor belt 84 is now driven by the motor 86 so that its upper run 92 moves in the direction of the refiner 36 and furthermore the refiner 36 is set in rotation by the motor 98, in the same direction of rotation 50 as in the case of first exemplary embodiment, that is to say in such a way that the bristles 40 move from the top downward on the front side 46 of the sand bed 32 and release the removed model sand particles through the gap 56 into the jet 52.
  • the sand bed 32 now runs in the form of a moving bed in the direction of the refiner 36 to the extent that model sand particles on the front 46 thereof are removed by the refiner 36 and released into the jet 52.
  • the carriage 74 is then slowly moved in the longitudinal direction 57 in the direction of the opposite side wall of the molding box 18 by means of the carriage drive 100, preferably at a constant speed, so that the model 12 in the molding box 18 is also covered with the layer 62 and a constant layer thickness 64.
  • the conveyor belt 84 is preferably moved at such a speed that the entire sand bed 32 applied to the upper run 92 is used up to load the model 12.
  • a pair of running rails 112 running over the molding box and the filling frame 22 is also provided, on which a carriage 116 can be moved by means of rollers 114.
  • This carriage 116 carries a sand container 118 as the feed device 26, with a container wall 120 which extends in the transverse direction 58 transversely to the longitudinal direction 57 and is pivotably mounted on the carriage 116 by means of a joint 122 and by means of an adjusting device 124, for example formed by a threaded rod 126 and nuts 128 and 130 seated thereon are adjustable in their alignment with the vertical 132, the container wall 120 extending essentially in the direction of the vertical 132.
  • a container wall 134 of the sand container 118 is provided opposite the container wall 120, which extends with a lower section 136 in the direction of the container wall 120 and together with this forms a lower opening 138 of the sand container 118.
  • Molded sand in particular green sand, is filled with the tubers 30 in this sand container 118. Due to the orientation of the sand container 118 substantially in the vertical 132, this molding sand tends to emerge from the lower opening 138.
  • the refiner 36 described in the first exemplary embodiment is arranged in front of this lower opening 138 in such a way that its cylindrical surface 44 runs essentially immediately below a lower edge of the section 136 and largely covers the lower opening 138, extends to the container wall 120 and with this forms the gap 56.
  • the sand bed 32 is formed with its front side 46, against which the ends 42 of the bristles 40 move in the manner described and thus remove model sand particles and convey them through the gap 56 into the jet 52.
  • the refiner 36 rotates such that the bristles 40 move in front of the lower opening 138 from the lower edge of the section 136 in the direction of the container wall 120 to the gap 56.
  • the refiner 36 is in turn driven by a motor 140 and rotatably mounted on the carriage 116 so that it can be moved in the longitudinal direction 57 together with the sand container by moving the carriage via a feed drive 142.
  • the adjustability of the container wall 120 via the adjusting device 124 now serves to adjust the size of the gap 56.
  • the entire carriage 116 is moved in such a way that the jet 52 is positioned above the fill opening 24, for example near the left side wall 144 of the molding box 18, and in this position the refiner 36 is driven by the motor 140 set in motion so that the bristles 40 remove the model sand particles from the sand bed 32 in the manner already described in connection with the first exemplary embodiment and emit them into the jet 52.
  • the feed drive 142 now moves the carriage 116 preferably at a constant speed in the longitudinal direction 57, so that the jet 52 travels from the left side wall 144 to the right side wall 146 of the molding box 18 and covers the model with the layer 62 of finely loosened model sand.
  • the motor 140 is switched off, so that the refiner 136 stops and no more model sand falls into the molding box 18.
  • a fourth exemplary embodiment of the device according to the invention designated as a whole by 150, shown in FIG. 4, comprises a sand container 152 with a lower opening 154, in which four refiners 36a to 36d with Rotational axes 156 aligned parallel to one another are arranged next to one another, in such a way that the cylinder surfaces 44a and 44b, 44b and 44c, 44c and 44d of adjacent refiners 36a and 36b, 36b and 36c, 36c and 36d each have a gap 158 or 160 or 160 respectively 162 Form. Furthermore, the cylinder surface 44a additionally forms a gap 166 with a container wall 164 facing it, while the cylinder surface 44d does not form a gap with the container wall 168 assigned to it.
  • the direction of rotation 170 of all refiners 36a to 36d is the same and runs such that the refiner 36a with its bristles moves 40 model sand particles through the gap 136, the refiner 36b model sand particles through the gap 158, the refiner 36c model sand particles through the gap 160 and the refiner 36d Model sand particles through the gap 162, so that a total of four beams 172, 174, 176 and 178 arise.
  • all refiners 36a to 36d are preferably driven by a single motor 180.
  • Each of the refiners 36a to 36d works in the fourth exemplary embodiment 150 in the same way as described in the first exemplary embodiment, the sand bed 32 being formed in front of each of the gaps 158, 160, 162 and 166 by the trailing molding sand in the sand container 152.
  • baffles 182 are additionally provided in the sand container 152.
  • the sand container 152 for placing the model is arranged stationary above the molding box 18, the cross-sectional areas of the beams 172, 174, 176 and 178 being selected such that they adjoin one another overall and the model 12 with the layer 62 is more constant Show thickness.
  • the sand container 152 can also be moved in the longitudinal direction 57 relative to the model 12, so that a layer 62 with a constant layer thickness 64 over the model 12 can thereby be achieved.
  • the carrier 38 is provided with refinement elements 40 ′ designed as lamellae, which likewise extend in the radial direction 39 of the carrier 38 and with their outer edges 42 ′ in the cylinder plane 44 lie.
  • the slats 40 ' are dimensioned such that they have a thickness in the direction of the circumferential direction 50 which is several times smaller than an average diameter of the bulbs 30, so that the outer edges 42' penetrate into the bulbs 30 in a destructive manner when the bulbs Slats 40 'are moved past the front 46 of the sand bed 32.
  • the distance Z of the fins 40 ' is selected so that it remains lump-free at the respective rotational speed of the refiner 36'.
  • the dimension of the intermediate spaces Z is preferably smaller than an average diameter of the bulbs 30 in the sand bed 32.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Crushing And Grinding (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Silicon Compounds (AREA)
  • Casting Devices For Molds (AREA)
EP92109829A 1991-06-18 1992-06-11 Sandverfeinerungsvorrichtung Expired - Lifetime EP0519324B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE9218171U DE9218171U1 (de) 1991-06-18 1992-06-11 Sandverfeinerungsvorrichtung

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4120026A DE4120026A1 (de) 1991-06-18 1991-06-18 Sandverfeinerungsvorrichtung
DE4120026 1991-06-18

Publications (2)

Publication Number Publication Date
EP0519324A1 EP0519324A1 (de) 1992-12-23
EP0519324B1 true EP0519324B1 (de) 1997-11-26

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EP92109829A Expired - Lifetime EP0519324B1 (de) 1991-06-18 1992-06-11 Sandverfeinerungsvorrichtung

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US (1) US5268195A (es)
EP (1) EP0519324B1 (es)
JP (1) JP2567547B2 (es)
DE (2) DE4120026A1 (es)
ES (1) ES2111011T3 (es)

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JP3030260B2 (ja) * 1997-03-10 2000-04-10 マツダ株式会社 鋳物砂の再生方法およびその装置
WO2011150275A1 (en) * 2010-05-26 2011-12-01 Sun Chemical Corporation Fiber based milling device and milling process using this device
CN205393066U (zh) * 2016-03-07 2016-07-27 成都京东方光电科技有限公司 喷淋设备
CN106311452B (zh) * 2016-09-21 2018-06-22 六安中达信息科技有限公司 一种用于生产泡沫玻璃的废旧玻璃粉碎传输装置

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US5268195A (en) 1993-12-07
JP2567547B2 (ja) 1996-12-25
DE59209035D1 (de) 1998-01-08
DE4120026A1 (de) 1993-01-14
ES2111011T3 (es) 1998-03-01
EP0519324A1 (de) 1992-12-23
JPH05177295A (ja) 1993-07-20

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