EP0012574B1 - Nivelage et compression automatiques du sable dans des moules de fonderie de hauteurs différentes - Google Patents

Nivelage et compression automatiques du sable dans des moules de fonderie de hauteurs différentes Download PDF

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Publication number
EP0012574B1
EP0012574B1 EP79302811A EP79302811A EP0012574B1 EP 0012574 B1 EP0012574 B1 EP 0012574B1 EP 79302811 A EP79302811 A EP 79302811A EP 79302811 A EP79302811 A EP 79302811A EP 0012574 B1 EP0012574 B1 EP 0012574B1
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EP
European Patent Office
Prior art keywords
mold box
rollers
sand
roller
mold
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
Application number
EP79302811A
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German (de)
English (en)
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EP0012574A1 (fr
Inventor
Earl W. Powers
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DEPENDABLE-FORDATH Inc
Dependable Fordath Inc
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DEPENDABLE-FORDATH Inc
Dependable Fordath Inc
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Application filed by DEPENDABLE-FORDATH Inc, Dependable Fordath Inc filed Critical DEPENDABLE-FORDATH Inc
Priority to AT79302811T priority Critical patent/ATE2201T1/de
Publication of EP0012574A1 publication Critical patent/EP0012574A1/fr
Application granted granted Critical
Publication of EP0012574B1 publication Critical patent/EP0012574B1/fr
Expired legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C25/00—Foundry moulding plants
    • 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

Definitions

  • This invention relates generally to multi-station sand mold making apparatus for producing sand molds for foundry use, and more particularly to a strike off apparatus for automatically levelling and compacting sand in mold boxes of varying heights carried in succession along a pathway.
  • Multi-station sand mold making apparatus have been known heretofore. It is desirable that such apparatus be capable of simultaneously producing the cope (upper half) and drag (lower half) portions of a composite sand mold, the two portions being complete and assembled upon each other and ready for the molten metal pouring operation at the time they leave the apparatus.
  • a plurality of mold boxes, each containing a mold pat.srn, are circulated around a closed pathway through a succession of stations at which different mold making operations are performed.
  • a predetermined amount of sand containing a binder and a catalyst is poured into an open-top mold box.
  • the mold box is simultaneously vibrated to eliminate voids and produce some compaction of the sand.
  • the amount of sand which is poured into the mold box is sufficient to form a mound which extends above the upper edges of the box.
  • the sand is distributed, levelled. and slightly compacted before the binder hardens. This may be done by hand tamping, by using a ramming apparatus, by using revolving rollers, or by some other known technique.
  • distributing it is meant that the mound of sand is spread more or less evenly throughout the mold box.
  • levelling it is meant that a smooth, horizontal upper surface is imparted to the sand which usually coincides with the upper edges of the mold box.
  • compacting it is meant that the space between the granules of sand is reduced.
  • the apparatus of the present invention When the apparatus of the present invention is utilized at this station, voids or gaps adjacent the pattern are eliminated. This ensures a more precisely defined casting. Also, the sand is compacted to a uniform density. Without such a uniform density, regions of the completed, hardened composite sand mold can prematurely crumble or fracture when the mold is filled with molten metal. This ruins the casting.
  • the cope and drag portions produced have smooth horizontal parting surfaces which mate when the cope and drag portions are joined to form a composite sand mold. Molten metal cannot seep between the cope and drag portions which would otherwise have to be removed by machining after hardening.
  • Another important advantage relates to the fact that a drag portion eventually rests on its surface which has been levelled and compacted. Since this surface is smooth and horizontal, the composite sand mold is stable, i.e. it does not tilt or rock. If the composite sand mold tilts or rocks while molten metal is being poured into it, the metal can miss the pouring hole in the mold.
  • U.S. patent No. 400,893 discloses an apparatus for levelling and compacting sand in an open-top mold box.
  • the box is conveyed underneath a pair of rollers which extend transversely of the direction of travel of the mold box.
  • the first roller which contacts the sand is positioned slightly higher than the second roller.
  • the first roller levels the sand before it is further levelled and compacted by the second roller.
  • the surface of the first roller is made of rubber or other resilient material to prevent hard chunks from interfering with the levelling and compacting.
  • Leveller blades are mounted after each roller. Mechanisms are provided for independently adjusting the height of the rollers.
  • rollers of the rollers are mounted in journal boxes which have spring mechanisms but it is not clear whether the rollers are biased downwardly against the sand. Gear mechanisms rotate the rollers in the same direction.
  • the rollers could be made to rotate against the direction of travel of the mold box, although this is not clear from the patent.
  • U.S. patent 1,759,728 discloses a similar apparatus which employs a pair of rollers for levelling and compacting sand in an open-top mold box.
  • the first roller is positioned higher than the second roller whose lower periphery is at the same height as the top edges of the mold box.
  • the rollers rotate so that their lower peripheries travel in the same direction as the direction of travel of the mold box passing thereunder.
  • the axle of the first roller is journaled in two bearings whose height can be vertically adjusted.
  • the axle of the second roller is pivotally mounted on the axle of the first roller, however, the height of the second roller is apparently fixed during the levelling and compacting operation by adjustable rods.
  • Neither of the aforementioned patented apparatus is adapted for automatically levelling and compacting sand in mold boxes of varying heights carried in succession along a pathway.
  • the rollers of each must be manually adjusted to a precise height if a mold box is to be run thereunder which has a different height than the immediately preceding mold box.
  • the present invention provides a strike-uff apparatus for levelling and compact- . ing mounds of sand extending above the upper edges of open-top mold boxes of varying heights carried in succession along a pathway, the apparatus comprising roller means for levelling and compacting a mound of sand in a mold box carried thereunder, the roller means comprising first and second rollers whose axes extend transversely of the direction of travel of the mold box and each of which has a length greater than the width of the mold box, means for pivotally supporting the rollers so that the first roller is positioned higher than the second ) roller and so that the rollers can swing toward ' and away from the mold box, means for rotating the rollers so that their lower peripheries move in a direction substantially opposite to the direction of travel of the mold box and means .
  • sensing means for biasing the rollers toward the mold box; sensing means for detecting an upper periphery of the mold box and the sand therein as the box is carried along said pathway and for determining a height having a predetermined relation to the height of the mold box before the moid box reaches the roller means, said height being selected whereby the lower periphery of the first roller is above the upper edges of the mold box and the lower periphery of the second roller is below the upper edges of the mold box; and means responsive to the sensing means for lowering the roller means to said height wherein the first roller levels and compacts the mound of sand as the mold box is carried thereunder and the second roller swings upwardly and rides along the upper edges of the mold box further to compact the sand and impart a smooth horizontal surface which coincides with said upper edges.
  • the present invention also provides a method of levelling and compacting mounds of sand extending above the upper edges of a plurality of open-top mold boxes of varying heights carried in succession along a pathway, comprising: determining the vertical position of the upper edges of an open-top mold box carried along a pathway, said mold box carrying a mound of sand extending higher than said upper edges of said mold box; lowering a pair of rollers from a first vertical position substantially above said mound of sand in said mold box to a second vertical position adjacent said determined vertical position of said upper edges of said mold box, said pair of rollers comprising first and second rollers whose axes extend transversely of the direction of travel of said mold box along said pathway, said rollers each having a length greater than the'width of said mold box, said rollers being pivotally supported wherein they can swing toward and away from said mold box, said first roller being positioned- higher than said second roller, said rollers being adapted to rotate whereby their lower peripheries move in a direction
  • a mixer 10 a strike off apparatus 12 constructed in accordance with the present invention, a bottom board feeder apparatus 14, a roll over draw apparatus 16, and a roll over close apparatus 18 are stationed successively along a pathway or main conveying line 20 of intermittently powered conveying rollers.
  • Each mold box contains a pattern such as indicated at 24.
  • a pneumatic cylinder 28 pushes the mold box beneath the discharge end 30 of the mixer 10.
  • a predetermined amount of sand 32 containing a binder and a catalyst is automatically poured into the mold box ( Figure 2A. step A).
  • the mold box is simultaneously vibrated to eliminate voids and produce some compaction of the sand.
  • the am . unt of sand which is poured into the mold box is sufficient to form a mound which extends above the upper edges of the box.
  • the mold box 22 containing the mound of sand 32 is conveyed to a corner 34 of the main conveying line 20 where it momentarily stops. After a time delay, the mold box 22 leaves the corner 34 and travels toward the strike off apparatus 12.
  • An infrared proximity sensor 36 mounted on an assembly supporting a pair of rollers 38, is activated. At this point the rollers 38 are at their upper limit of movement and an elevating mechanism lowers the roller assembly and the sensor 36 until the horizontal scanning beam of the sensor is intercepted by the mound of sand 32 in the mold box. This is done before the box reaches the rollers.
  • the rollers 38 stop at a height so that they ride over the sand in the mold box as the box passes thereunder.
  • the sand is levelled and slightly compacted by the rollers. After the mold box has passed under the rollers, they are raised to their original positions and the apparatus awaits the next succeeding box.
  • the mold box 22 is conveyed along the pathway 20 to the bottom board feeder apparatus 14 where it momentarily stops in position for receiving a bottom board such as 40.
  • An infrared proximity sensor 42 is mounted on the board elevating mechanism of the bottom board feeder apparatus senses the presence of the mold box 22.
  • the bottom board 40 has already been conveyed along a return conveying line 44 of intermittently powered conveying rollers onto the bottom board feeder apparatus 14.
  • the elevating mechanism of the bottom board feeder apparatus raises the bottom board 40 until the horizontal scanning beam of the sensor 42 is above the upper surface of the mold box 22.
  • a shuttle mechanism 46 of the bottom board feeder apparatus feeds the bottom board laterally onto the top of the mold box ( Figure 2A, step C).
  • the mold box 22, now covered with a bottom board 40 is conveyed along the main conveying line 20 to the roller over draw apparatus 16.
  • the mold box 22 and the bottom board 40 are clamped between jaws of rollers 48 and arms 50 grip the bottom flange of the mold box ( Figure 2A, step D).
  • the mold box 22 and the bottom board 40 are inverted, i.e. rolled over 180 degrees ( Figure 2A, step E).
  • the now hardened cope portion 52 of the sand mold is lowered out of the mold box 22 with the aid of vibrating mechanisms by unclamping the jaws of rollers 48. ( Figure 2A, step F).
  • the cope portion 52 and the bottom board 40 upon which it now rests are conveyed out of the roll over draw apparatus 16 and along the main conveying line 20 to the roll over close apparatus 18.
  • the mold box 22 is clamped between the rollers 48 and re-inverted, i.e. rolled over 180 degrees.
  • the mold box 22 is then conveyed out of the roll over draw apparatus 16 to box return mechanism 54 positioned between the roll over draw apparatus 16 and the roll over close apparatus 18.
  • the mechanism 54 ejects the mold box 22 laterally and the mold box is returned along the main conveying line 20 to its original starting place.
  • Arms 56 of the roll over close apparatus 18 clamp. the cope portion 52 and raise it off of the bottom board 40 ( Figure 2A, steps G and H).
  • the bottom board 40 is conveyed out of the roll over close apparatus 18 to a position adjacent a nneumatic cylinder 58 which pushes the board laterally to a position adjacent a pneumatic cylinder 60.
  • the cope portion 52 is inverted, i.e. rolled over 180 degrees ( Figure 2A, step I).
  • the cope portion 52 is maintained in an elevated position above the level of the main conveying line 20 awaiting the arrival of a drag portion.
  • the multi-station sand mold making apparatus shown in Figure 1 produces the drag portion 62 of the composite sand mold (Figure 2B, step J), the steps being the same as steps A through F ( Figure 2A).
  • the drag portion 62 and the bottom board 64 upon which it rests are then conveyed into the roll over close apparatus 18 directly underneath the waiting cope portion 52 ( Figure 2B, step K).
  • the cope and drag portions 52 and 62 are joined ( Figure 28, step L) and they are conveyed, resting on top of the bottom board 64, out of the roll over close apparatus 18 to a position adjacent the pneumatic cylinder 58.
  • the pneumatic cylinder 58 pushes the bottom board 64, and the cope and drag portions 52 and 62 carried thereby, laterally to a position adjacent the pneumatic cylinder 60.
  • the bottom board 64 pushes the bottom board 40 onto the return conveying line 44 and the powered conveying rollers thereof convey the bottom board 40 back to the bottom board feeder apparatus 14.
  • An infrared proximity sensor 66 senses the presence of the completed sand mold and actuates the pneumatic cylinder 60 which pushes the joined cope and drag portions 52 and 62 down a chute 68 which leads to a metal pouring station (Figure 2B, step M).
  • the next succeeding bottom board that is pushed laterally by the pneumatic cylinder 58 will push the bottom board 64 laterally onto the return conveying line 44 which will return it to the bottom board feeder apparatus 14.
  • the illustrated embodiment of the strike off apparatus 12 includes a tripod base 100 which includes a central, vertically extending cylindrical base 102.
  • a cylindrical guide 104 extends vertically from the cylindrical base 102.
  • a vertically extending cylindrical sleeve 106 fits over the cylindrical guide 104 and is adapted to slide upwardly and downwardly about the guide 104 in telescoping fashion.
  • a horizontal arm 108 is attached to the sleeve 106 and extends across the conveying line 20.
  • the sleeve 106 and the arm 108 support the rollers 38 as will later be described.
  • a vertically extending hydraulic cylinder 110 is mounted on a horizontally extending flange 112 secured to the cylindrical base 102.
  • the piston rod 114 of the hydraulic cylinder 110 is attached to a fork 116 which is bolted to a bracket 118 secured to the underside of the arm 108. The extension and retraction of the piston rod 114 raises and lowers the sleeve 106 and the arm 108, and the rollers 38 carried thereby.
  • the lower portion of a vertically extending curved mounting plate 120 is attached to the cylindrical base 102.
  • the upper portion of the plate 120 is spaced from the sleeve 106.
  • a normally open upper limit switch 122 and a normally closed lower limit switch 124 are mounted on the edge of the plate 120.
  • the switches 122 and 124 are closed and opened respectively when their cam followers 126 and 128 engage a vertically extending cam 130 attached to the side of the sleeve 106.
  • the switches 122 and 124 limit the upward and downward travel of the sleeve 106, the arm 108, and the rollers 38, as will be explained later on in greater detail.
  • the rollers 38 are supported by the sleeve 106 and the arm 108 and extend horizontally across the path of travel of the mold box 22. They have a length which is greater than the width of the mold box.
  • the rollers are preferably made of a resilient material such as polyurethane. The resiliency of the rollers reduces the wear on the rollers and on the upper edges of the mold boxes which occurs after long periods of use. Polyurethane is preferred because the sand containing the binder and catalyst will not stick to the rollers. This eliminates the necessity of cleaning the rollers after each levelling and compacting operation.
  • the rollers 38 are mounted on axles 132 which extend on opposite sides of the sleeve 106.
  • the ends of axles 132 remote from the sleeve 106 are' journaledin bearings 134 ( Figures 3 and 5) secured by bolts 135 to the bases of triangular support plates 136.
  • the innermost of the bolts 135 are secured to the triangular support plates 136 through vertically extending arcuate apertures 137 ( Figure 5) which extend through the plates 136.
  • the apexes of the triangular support plates 136 are pivotally secured by bolts 138 ( Figures 3 and 5) to a plate 140 mounted on the remote end of the arm 108.
  • the triangular support plates 136 each have horizontally extending arcuate apertures 142 ( Figure 5) therethrough.
  • Bolts 146 secured to the plate 140 slide in the apertures 142 and limit the pivotal movement of the plates 138..
  • the first roller 38A which is the first to contact the sand 32 in the mold box 22, is pre-, ferably positioned so that its lower periphery is slightly above the upper edges of the mold box after the rollers 38 have been lowered as will be described later on.
  • the second roller 388 is preferably positioned so that its lower periphery is slightly below the upper edges of the mold box 22 after the rollers 38 have been lowered. The reason for positioning the rollers 38A and 388 in this manner is described later on.
  • the apexes of the triangular support plates 150 are pivotally secured by bolts 1 52 ( Figures 3 and 4) to a plate 154 secured to the sleeve 106.
  • the triangular support plates 150 have horizontally extending arcuate apertures 156 ( Figure 4) therethrough.
  • Bolts 157 ( Figure 3) secured to the plate 154 slide in the apertures 156 to limit the pivotal movement of the plates 150. Since the support plates 136 and 150 are pivotally mounted, the rollers 38 can swing toward and away from the mold box as it is carried under the rollers.
  • Pulleys 158 are mounted on the ends of the axles 132.
  • the motor 160 is drivingly connected with the rollers 38 by a belt 168 ( Figures 3 and 4) which rides in the pulleys 158 and 162.
  • the rollers 38 are preferably rotated in a counter-clockwise direction ( Figure 6) so that their lower peripheries move in an opposite direction to the direction of travel of the mold box 22. This counter-rotation more evenly distributes the sand in the box.
  • One end of an arm 170 (Figures 3 and 4) is rotatably mounted on a housing 172 mounted on the plate 167.
  • the other end of the arm 170 rotatably supports an idler pulley 174.
  • the housing 172 contains an internal spring mechanism (not shown in the drawings) which urges the pulley 174 in a counter-clockwise direction against the belt 168 so that the belt is tightened and rides in the pulley 174.
  • the rollers 38 are thus biased downwardly and can swing upwardly when enouqh force is exerted against them to cause the putiey 174 to swing in a clockwise direction ( Figure 4).
  • the infrared proximity sensor 36 ( Figures 1 and 3) is mounted on a bracket 176 ( Figure 3) attached to the plate 140.
  • the sensor 36 is aimed so that its scanning beam extends horizontally between the lower peripheries of the rollers 38A and 38B ( Figure 3) across the conveying line 20 ( Figure 1).
  • a normally open, box-approaching limit switch 178 is mounted on the edge of the conveying line 20 in advance of the strike off apparatus 12.
  • the switch 178 is closed when the mold box 22 leaves the corner 34 and approaches the strike off apparatus.
  • the switch 178 remains closed until the mold box 22 reaches the rollers 38 at which time it opens.
  • a normally open, box-departing limit switch 179 is mounted on the edge of the conveying line 20 after the strike off apparatus 12. The switch 179 is closed after the mold box 22 has passed beneath the rollers 38.
  • a power unit generally designated 180 ( Figure 3) is positioned adjacent the tripod base 100. It contains a three-phase induction motor 182 which is drivingly coupled to a hydraulic pump 184.
  • the hydraulic pump 184 pumps hydraulic fluid from a hydraulic fluid tank contained within a housing 186 through the hydraulic circuit shown in Figure 8.
  • the senor 36 is aimed across the conveying line 20 so that its beam is initially intercepted by a portion of the mound which is adjacent an upper edge of the mold box.
  • the upper periphery of this portion of the mound is slightly higher than the upper edges of the mold box.
  • the vertical position of the sensor 36 relative to the rollers is such that the rollers stop descending when the lower periphery of the first roller 38A is above the upper edges of the mold box and the lower periphery of the second roller 38B is below the upper edges of the mold box.
  • the senor 36 can be aimed across the conveying line 20 so that its beam is initially intercepted by an upper edge of the mold box rather than by the sand mound. In this case the sensor would have to be vertically adjusted relative to the rollers so that the rollers stop descending relative to the mold box in the positions just described.
  • the sensor 36 detects an upper periphery of the mold box and the sand therein and determines a height which has a predetermined relation to the height of the mold box.
  • the rollers are thereby lowered to a height which will produce the desired levelling and compacting hereafter described. If the mold box 22 is lowered on the conveying line before it reaches the rollers 38, and after the rollers have already descended, the rollers will descend a second time to compensate for the lowering of the mold box.
  • the first roller 38A levels and slightly compacts the sand 32-in the mold box.
  • the second roller 38B swings upwardly and rides along the upper edges of the mold box. It further compacts the sand and imparts a smooth, horizontal surface with coincides with the upper edges of the mold box.
  • the compaction of the sand occurs as a result of the downward biasing force of the rollers supplied by the pulley 174 pressing against the belt 168.
  • the sand 32 has a uniform density.
  • the counter rotation of the rollers helps to evenly distribute the sand. Excess sand falls away from the mold box and is reclaimed.
  • rollers 38 can swing toward and away from the mold box, they do not have to be lowered to a precise height relative to the upper edges of the mold box. So long as the second roller 38B will press against the upper edges of the mold box satisfactory results can be achieved.
  • conductors 200 are connected to electric lines 202 by throwing a manual circuit breaker switch 204.
  • the electric lines 202 are connected to a 60 Hertz, three phase, AC electric power source.
  • the leads 206 of the three phase induction motor 182 which drives the hydraulic fluid pump 184 are each connected to one terminal of individual melting alloy units 210.
  • the other terminals of the melting alloy units 210 are each connected to relay contacts 212 which are in turn connected to the conductors 200 through fuses 214.
  • the relay contacts 212 are associated with a relay winding 216.
  • the melting alloy units 210 are mechanically ganged. During the operation of the strike off apparatus, if any one of the units 210 melts due to an overload or phase loss, all of them will melt. This will cause contacts 218 to open, thereby de-energizing the relay winding 216 and causing the relay contacts 212 to open. The motor 182 will thus be protected from damage due to overload or phase loss.
  • the leads 220 of the primary winding of a transformer 222 are connected to two of the conductors 200 through fuses 224.
  • One lead 226 of the secondary winding of the transformer 222 is connected through a fuse 228 and through relay contacts 230 to a bus generally designated 232.
  • the relay contacts 230 are associated with a master control relay winding 234.
  • the other lead 236 of the secondary winding of the transformer 222 is grounded and is connected to a bus generally designated 238.
  • the remaining components of the electrical circuit are connected between the buses 232 and 238.
  • the strike off apparatus 12 is started by depressing a momentary switch 240 which causes the master control relay winding 234 to be energized. This in turn causes the relay contacts 230 and 242 associated with the master control relay winding 234 to close.
  • the relay winding 216 is energized which closes the relay contacts 212.
  • the motor 182 is energized and hydraulic fluid begins to flow through the hydraulic circuit.
  • the hydraulic motor 160 is driven and the rollers 38 are rotated.
  • an indicator lamp 244 lights up to indicate that the strike off apparatus is in its "power on” mode. If the lamp 244. does not light up when the switch 240 is depressed, a testor switch 246 can be manually thrown. If the lamp 244 lights up the relay winding 234 and the relay contacts 242 should be checked for defects.
  • the infrared proximity sensor 36 is energized.
  • the rollers 38 are positioned at their upper limit of movement.
  • the upper limit switch 122 is open and the lower limit switch 124 is closed.
  • a solenoid 248 protected by a fuse 250 is energized.
  • the solenoid 248 shifts a four way, three position, spring centered, hydraulic fluid valve 252 ( Figure 8) so that hydraulic fluid flows into the hydraulic cylinder 110 and causes the piston rod 114 to retract and the rollers 38 to descend.
  • the upper limit switch 122 closes.
  • Momentary switches 266 and 268 may be depressed to override the automatic operation and cause the rollers to rise or descend, respectively.
  • a momentary switch 270 may be depressed to place the strike off apparatus into its "power off" mode. This may be done at the conclusion of any number of cycles, or during a cycle in case.of an emergency.
  • the hydraulic circuit also includes a pressure release' valve 272 which protects the components of the hydraulic circuit if potentially damaging high fluid pressure should arise.
  • the hydraulic fluid is routed through a variable flow control valve 274.
  • the valve 274 may be adjusted to vary the amount of hydraulic fluid which is by-passed directly into the hydraulic fluid tank in the housing 186. This will in turn vary the speed at which the piston rod 114 will extend and retract and the speed at which the rollers 38 will rise and descend. It will also vary the speed at which the rollers 38 rotate. This speed must be adjusted to obtain the best results.
  • a meter 276 indicates hydraulic fluid pressure.

Claims (3)

1. Appareil mobile pour niveler et compacter des tas de sable (32) s'étendant au-dessus des bords supérieurs de moules (22) de différentes hauteurs ouverts vers le haut transportés successivement sur un chemin de circulation (20), l'appareil comprenant: des moyens de roulement (38) poiir niveler et compacter un tas de sable dans un moule amené au-dessous, les moyens de roulement comprenant un premier (38A) et un deuxième (38B) rouleau dont les axes s'étendent transversalement par rapport au sens du mouvement du moule et dont chacun a une longueur supérieure à la largeur du moule, des moyens (136, 150 pour supporter de façon pivotante les rouleaux de façon à ce que le premier rouleau soit positionné plus haut que le deuxième rouleau et de façon à ce que les rouleaux puissent se déplacer en se rapprochant et en s'éloignant du moule, des moyens (160, 168) pour faire tourner les rouleaux de façon à ce que leurs périphéries inférieures se déplacent dans une direction substantiellement opposée à la direction du mouvement du moule, et des moyens (170, 172, 174) pour dévier les rouleaux vers le moule; des moyens de détection (36) pour détecter la périphérie supérieure d'un moule et du sable qui y est contenu lorsque le moule est transporté le long dudit chemin et pour déterminer une hauteur ayant une relation prédéterminée avec la hauteur du moule avant que le moule atteigne les moyens de roulement, ladite hauteur étant choisie de façon que la périphérie inférieure du premier rouleau (38A) est audessus des bords supérieurs du moule et la périphérie inférieure du second rouleau (38B) est au-dessous des bords supérieurs du moule; et des moyens (110, 114) de réponse aux moyens de détection pour abaisser les moyens de roulement à ladite hauteur dans lequel le premier rouleau nivèle et compacte le tas de sable lorsque le moule est transporté en dessous et la second rouleau se déplace vers le haut et circule le long des bords supérieurs du moule pour compacter davantage le sable et donner une surface horizontale régulière qui coïncide avec lesdits bords supérieurs.
2. Appareil selon la revendication 1, dans lequel les moyens (136, 150) pour supporter les rouleaux de façon pivotante comprennent des . moyens (135, 137, 149, 151) pour régler la hauteur des rouleaux les uns par rapport aux autres.
3. Procédé de nivelage et de compactage de tas de sable (32) s'étendant au-dessus des bords supérieurs de plusieurs moules (22) de différentes hauteurs ouverts vers le haut, transportés successivement le long d'un chemin de circulation (20) comprenant la détermination de la position verticale des bords supérieurs d'un moule (22) ouverts vers le haut transporté le long d'un chemin de circulation (20), ledit moule - transportant un tas de sable (32) s'étendant au-dessus desdits bords supérieurs dudit moule; l'abaissement d'une paire de rouleaux (38) depuis une première position verticale substantieftement au-dessus dudit tas de sable dans ledit moule jusqu'à une deuxième position verticale voisine de ladite position verticale déterminée desdits bords supérieurs dudit moule, ladite paire de rouleaux comprenant un premier rouleau (38A) et un second rouleau (38B) dont les axes s'étendent transversalement au sens de circulation dudit moule le long dudit chemin de circulation, lesdits rouleaux ayant chacun une longueur supérieure à la largeur dudit moule, lesdits rouleaux étant supportés de façon pivotante de manière à pouvoir se déplacer en se rapprochant et en s'éloignant dudit moule, ledit premier rouleau (38A) étant positionné plus haut que ledit second rouleau (388), lesdits rouleaux étant adaptés à tourner de façon à ce que leurs périphéries inférieures se déplacent dans une direction opposée à la direction du mouvement dudit moule le long dudit chemin de circulation, lesdits rouleaux étant déviés vers ledit moule, ladite deuxième position verticale étant une position où la périphérie inférieure dudit premier rouleau se trouve au-dessus desdits bords supérieurs dudit moule et la périphérie inférieure dudit second rouleau est-dessous desdits bords supérieurs dudit moule; le passage dudit moule le long dudit chemin de circulation au-dessous desdits rouleaux de façon à ce que ledit premier rouleau nivèle et compacte ledit tas de sable jusqu'à une hauteur au-dessus desdits bords supérieurs dudit moule et ledit second rouleau entre en contact avec l'avant dudit moule, se déplace vers le haut et circule le long desdits bords supérieurs dudit moule pour compacter davantage ledit tas de sable et préparer une surface horizontale régulière, ladite surface coïncidant avec lesdits bords supérieurs dudit moule; et ladite paire de rouleaux se levant jusqu'à ladite première position verticale après que ledit moule ait passé en dessous.
EP79302811A 1978-12-06 1979-12-06 Nivelage et compression automatiques du sable dans des moules de fonderie de hauteurs différentes Expired EP0012574B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT79302811T ATE2201T1 (de) 1978-12-06 1979-12-06 Automatisches planieren und verdichten von sand in formkaesten verschiedener hoehen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US96711078A 1978-12-06 1978-12-06
US967110 2001-09-27

Publications (2)

Publication Number Publication Date
EP0012574A1 EP0012574A1 (fr) 1980-06-25
EP0012574B1 true EP0012574B1 (fr) 1983-01-12

Family

ID=25512314

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79302811A Expired EP0012574B1 (fr) 1978-12-06 1979-12-06 Nivelage et compression automatiques du sable dans des moules de fonderie de hauteurs différentes

Country Status (4)

Country Link
EP (1) EP0012574B1 (fr)
JP (1) JPS55100847A (fr)
AT (1) ATE2201T1 (fr)
DE (1) DE2964506D1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109226693A (zh) * 2018-11-27 2019-01-18 荣成富邦金属科技有限公司 一种铸造型砂压实装置
CN115625299B (zh) * 2022-11-10 2024-04-19 淄博通普真空设备有限公司 一种多维振动装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1108384B (de) * 1952-02-25 1961-06-08 Erwin Buehrer Verfahren und Vorrichtung zum Einfuellen und Vorverdichten koerniger Massen in Giessereiformkasten
BE795465A (fr) * 1972-02-15 1973-08-16 Borden Chem France Installation pour la fabrication de panneaux en beton a liant resineux
DE2430523A1 (de) * 1974-06-25 1976-01-15 Lothar Pernes Fertigergeraet fuer plattenfoermige betonfertigteile
CH604967A5 (fr) * 1974-12-10 1978-09-15 Erwin Buehrer
DE2602861A1 (de) * 1976-01-27 1977-07-28 Gazulla Manuel Alquezar Vorrichtung zur kontinuierlichen formung von platten aus gipsmasse

Also Published As

Publication number Publication date
EP0012574A1 (fr) 1980-06-25
JPS55100847A (en) 1980-08-01
DE2964506D1 (en) 1983-02-17
ATE2201T1 (de) 1983-01-15

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