EP1455971B1 - Dispositif permettant d'effectuer un meilleur approvisionnement d'un materiau particulaire de moulage dans la tremie d'une machine a mouler con ue pour la fabrication de moules - Google Patents

Dispositif permettant d'effectuer un meilleur approvisionnement d'un materiau particulaire de moulage dans la tremie d'une machine a mouler con ue pour la fabrication de moules Download PDF

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Publication number
EP1455971B1
EP1455971B1 EP01275048A EP01275048A EP1455971B1 EP 1455971 B1 EP1455971 B1 EP 1455971B1 EP 01275048 A EP01275048 A EP 01275048A EP 01275048 A EP01275048 A EP 01275048A EP 1455971 B1 EP1455971 B1 EP 1455971B1
Authority
EP
European Patent Office
Prior art keywords
hopper
inlet opening
guiding surface
opening
mould
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
EP01275048A
Other languages
German (de)
English (en)
Other versions
EP1455971A1 (fr
Inventor
Vagn Mogensen
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.)
Disa Industries AS
Original Assignee
Disa Industries AS
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Disa Industries AS filed Critical Disa Industries AS
Publication of EP1455971A1 publication Critical patent/EP1455971A1/fr
Application granted granted Critical
Publication of EP1455971B1 publication Critical patent/EP1455971B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B22C5/12—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose for filling flasks

Definitions

  • the present invention relates to a device for improved supply of mould particle material to the hopper of a foundry machine for mould-making according to the preamble of Claim 1.
  • the conditioned "sand" i.e. the particle material
  • the conditioned "sand” for foundry moulds is normally delivered to the hopper on each individual mould-making machine via gravitational fall from a conveyor system above (e.g. a belt system).
  • a conveyor system above e.g. a belt system.
  • Such machines normally are capable of functioning in repeated cycles of controlled sequential series of steps, each cyclus yielding a mould, that can be part(s) of one/more set(s) of moulds.
  • Such machines normally are furnished with the hopper designed as a pressure chamber provided with a top inlet opening for the falling "sand", that has a relatively small opening area, which is sealable by means of some type of valve function (e.g. a slide gate), as some or all of the sand from the so sealed hopper by means of pressurized gas (normally air) from a controlled driving gas system is furthered into a mould chamber, whereafter an adequate amount of sand once more is secured in the hopper, before sand once more is furthered into the mould chamber for the consecutive mould, etc.
  • the sand is pressed/squeezed to form a mould component, which after removal leaving space for the next volume of sand to be furthered in, in functional combination with mating component(s) later are poured with molten material.
  • An example of a machine as described above is an automatically functioning mould-making machine of the "Disamatic®"-type.
  • a relevant mould-making foundry machine To intercept the sand falling from the conveyor system, a relevant mould-making foundry machine normally incorporates a known element with a generally funnel-shaped surface to guide the sand recieved to the opened top inlet opening of the machine's hopper.
  • the known types of guiding funnels are normally of frusto-conical or frusto-pyramidal shape, the wider end face pointing upwards to offer a wide/long opening to intercept the falling sand, that can have its "delivery positions" from the conveyor system varying according to parameters as: particle material condition, shape of conveyor's delivery opening, horizontal speed component "inherited" from conveyor system, fall height, actual sand flow, etc.
  • the frusto-shape's smaller end face is normally adapted to present a smooth transformation of shape to the opened top inlet opening to facilitate the inflow of falling particle material and to avoid build-up caused by edge-effects during the sand inflow.
  • the main object of the present invention is therefore to provide a device to improve the supply of falling particle material into a foundry machine's hopper through the inlet opening by overcoming the problems described above.
  • the device for improved sand supply therefore possesses the following characterizing features:
  • the structure is substantially made of sheet material, as such material inherently is offering a smooth guiding surface, hindering local build-ups.
  • the tapered space is positioned approximately vertically, centrally to the opened said inlet opening, as such placement normally is best suited for all-round mould production, due to the provision of a substantially ring-shape opening at the edge of the opened inlet opening for the counterflowing escaping gas from the hopper cushioning the opening seals from particles.
  • the at least meta-stable guiding surface is of/lined with a smooth and low-friction material, e.g. a PTFE-composite, thus offering improved avoidance of local build-up/blocking of particle material(s) of difficult-to-handle composition and/or condition.
  • a smooth and low-friction material e.g. a PTFE-composite
  • the structure is controlled movable up and down in a sequence related to the opening/closing of said inlet opening, thus better being able to intercept the falling stream of sand by approaching a delivery source, especially at the beginning of a delivery phase.
  • the structure partly is temporarily positioned below said opened inlet opening, thus better protecting the seals against particle deposition and offering possibility to better control the dispensing of sand in the hopper.
  • the structure is pivotable in a substantial vertical plane, thus being able to better "follow" the falling stream of sand to intercept.
  • the structure is pivotable in a substantial vertical plane escaping physical contact with the element(s) closing the inlet opening and vice versa, thus in some cases permitting prolonged filling of the hopper during the start of the closing of the inlet opening to further minimize cycle-time.
  • the narrower end of the structure might be optimized profilated and positioned accordingly, so the last particle material slides the side of the guiding surface farthest form the nearest edge of the inlet opening closing member.
  • the structure is comprising exitating means, e.g. vibrating means, to further facilitate the flow of particle material over the guiding surface to avoid deposition.
  • exitating means e.g. vibrating means
  • the device is comprising motive and/or detection means controlled by/communicating with said machine and/or a conveying system supplying said falling particle material. So, the movements might be optimized to save time, resulting in higher overall production rate.
  • Re. fig. 1 is shown the hopper 1 of a mould-making foundry machine, of whose lower parts only the chamber 2 for forming the mould by relatively approaching the two opposed movable end walls fitted with pattem plates, thus squeezing the intermediate particle material to be a relatively stable block, is schematically indicated.
  • the machine generally being of the commonly known "Disamatic®"-type and functioning accordingly.
  • the hopper 1 bottom part is not conical, but merges in the mould chamber 2 ceiling by a slit across the pressing directions.
  • the step of supplying sand 3 to the hopper is shown, as the hopper 1 has already been partly filled with sand 3, which has passed the opened inlet opening 4, while more sand 5 is downstreaming as a falling jet from a supply system above, which has not been further referenced to, but can be seen depicted as a belt-type conveying system, the movement of the belt, at least of on/off-type, being controlled according to the demand for further material according to communication to/from a controlling system also controlling the foundry machine below.
  • the conditioned particle material mixture (the "sand") 5 is rolled off the conveyor band to the left in fig. 1 and is falling as a stream driven by gravity, but also still moving according to a horizontal velocity component inherited from the movement with the band. Conforming the belt speed, the sand 5 thus will take a direction downwards more or less off-center the opened inlet opening 4.
  • the inventive guiding device 6 is shown as made of sheet material following a frusto-conical shape, the lower, narrower end pointing to the center of the inlet opening, thus defining an effectively smaller outlet opening at the lower edge of the guiding surface for the downstreaming sand internally of the structure of the inventive device.
  • the wider end of the guiding surface is pointing substantially upwards to catch the falling sand by intercepting the stream 5 from the supply system.
  • Ability to rock or swing the wider opening of the guiding surface in a substantially vertical plane following the directions of movement of the belt offers a better ability to intercept the stream of falling sand 5 as this "covers" an elongated area depending of the actual speeds of the belt.
  • the falling sand 5 is from the narrower end of the guiding surface passing the opened inlet opening 4 as a concentrated, centered jet or beam of falling material.
  • This beam is guided by the inventive guiding device 6 to leave a circular opening at 7 near the edge of the inlet opening to allow for the unhindered counterflowing escape of gas form the hopper, that is driven out as the volume is being occupied by sand 3.
  • the escaping counterflowing upstream of gas/air from the hopper 1 is symbolised by the arrows as at 7, clearly showing the non-interference of the two counterstreams of sand and air respectively faciltating the entrance of sand into the hopper without blocking the inlet opening and the exit of gas from the hopper without carrying out intermixed fines from the particle material 5 to disturb/pollute the surroundings/environment.
  • the escaping counterflowing upstream of gas/air is also cushioning the circumferential seal 8 and the domed sealing body 9 of such exemplarily shown dome valve for sealing the inlet opening, thus hindering deposition of particle material at the sealing faces and resulting excessive wear of these components.
  • bracketing at least some structure of the inventive device to the other stationary components preferably of the foundry machine, but possibly also to the sand supply system and/or a present ventilating system, is not shown, as such brackets, etc present no major challenge to a person skilled in the art to craft/design/manufacture.
  • the possible means to raise/lower/pivot and/or vibrate the guiding surface of the inventive device 6 are also of evident character for the skilled person to understand and execute and will thus be treated no further here.
  • the narrower opening of the "delivering" end of the guiding surface of the device 6 according to the present invention has a smaller area than the opening of the inlet opening 4, hitherto used comparatively "unrestricted", a more even distributed and speedier supply of the required volume of sand to the hopper is achieved, by the beneficial function of the device according to the present invention.
  • the resulting improvement in overall effective cycle time for the mould-making system is also making retrofitting of the inventive device 6 relevant to existing foundry machines, not presently being equipped with such device 6.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Devices For Molds (AREA)
  • Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
  • Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)

Claims (10)

  1. Dispositif pour l'alimentation améliorée de matériau particulaire (3, 5) pour moule de fonderie dans une trémie (1) d'une machine de fonderie, via une ouverture d'entrée (4) qu'elle comporte, ledit dispositif comprenant :
    un organe d'alimentation, tel qu'un transporteur à courroie, pour délivrer le matériau par portions et quantités contrôlées à
    une surface de guidage (6) positionnée pour guider le matériau depuis l'organe d'alimentation jusqu'à l'ouverture d'entrée (4) de la trémie (1),
    ladite ouverture d'entrée (4) étant susceptible d'être obturée par une valve (9) afin de permettre l'entrée du matériau de la trémie (1) dans une chambre de moulage (2), sous l'action d'un gaz sous pression introduit dans la trémie (1) au-dessus du matériau après la fermeture de l'ouverture d'entrée (4), et
    ladite surface de guidage (6) se présentant comme une surface se rétrécissant, ayant la forme d'un entonnoir, et au moins partiellement stable mécaniquement, son ouverture large étant dirigée vers le haut pour recevoir le matériau qui tombe de l'organe d'alimentation, et son ouverture étroite étant positionnée et dimensionnée pour amener le matériau sous forme de courant dans l'ouverture (4) de la trémie (1), en laissant un intervalle entre l'ouverture (4) et le courant de matériau, ledit intervalle permettant à l'air de s'échapper de la trémie (1) à contre-courant du matériau sans se mélanger avec celui-ci, et
    lesdites ouvertures large et étroite de ladite surface de guidage (6) étant ouvertes et non obstruées en permanence, afin de permettre le libre écoulement du matériau.
  2. Dispositif selon la revendication 1, caractérisé en ce que ladite surface de guidage (6) est pour l'essentiel en un matériau consistant en feuillard.
  3. Dispositif selon la revendication 1 ou 2, caractérisé en ce que ladite surface se rétrécissant, ayant la forme d'un entonnoir, est positionnée de façon sensiblement verticale et centrée par rapport à ladite ouverture d'entrée (4) ouverte.
  4. Dispositif selon l'une ou plusieurs des revendications précédentes, caractérisé en ce que ladite surface de guidage (6) au moins partiellement stable mécaniquement, est, soit réalisée, soit revêtue, d'un matériau lisse et à faible friction, par exemple un composite de PTFE (polytétrafluroéthylène).
  5. Dispositif selon l'une ou plusieurs des revendications précédentes, caractérisé en ce que ladite le déplacement vers le haut et vers le bas de la surface de guidage (6) est contrôlée selon une séquence fonction de l'ouverture/fermeture de ladite ouverture d'entrée (4).
  6. Dispositif selon l'une ou plusieurs des revendications précédentes, caractérisé en ce que ladite surface de guidage (6) est en partie temporairement positionnée en dessous de ladite ouverture d'entrée (4) ouverte.
  7. Dispositif selon l'une ou plusieurs des revendications précédentes, caractérisé en ce que ladite surface de guidage (6) est susceptible de pivoter dans un plan sensiblement vertical.
  8. Dispositif selon les revendications 6 et 7, caractérisé en ce que ladite surface de guidage (6) est susceptible de pivoter dans un plan sensiblement vertical, sans être au contact physique avec le(les) élément(s) fermant ladite ouverture d'entrée et vice versa.
  9. Dispositif selon l'une ou plusieurs des revendications précédentes, caractérisé en ce que ladite surface de guidage (6) comprend des moyens d'excitation.
  10. Dispositif selon l'une ou plusieurs des revendications précédentes, caractérisé en ce qu'il comprend des moyens moteurs et de détection contrôlés par ladite machine ou communiquant avec ladite machine et/ou un système de transport amenant ledit matériau particulaire (5) qui tombe.
EP01275048A 2001-12-20 2001-12-20 Dispositif permettant d'effectuer un meilleur approvisionnement d'un materiau particulaire de moulage dans la tremie d'une machine a mouler con ue pour la fabrication de moules Expired - Lifetime EP1455971B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/DK2001/000855 WO2003053609A1 (fr) 2001-12-20 2001-12-20 Dispositif permettant d'effectuer un meilleur approvisionnement d'un materiau particulaire de moulage dans la tremie d'une machine a mouler conçue pour la fabrication de moules

Publications (2)

Publication Number Publication Date
EP1455971A1 EP1455971A1 (fr) 2004-09-15
EP1455971B1 true EP1455971B1 (fr) 2005-05-11

Family

ID=8149454

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01275048A Expired - Lifetime EP1455971B1 (fr) 2001-12-20 2001-12-20 Dispositif permettant d'effectuer un meilleur approvisionnement d'un materiau particulaire de moulage dans la tremie d'une machine a mouler con ue pour la fabrication de moules

Country Status (6)

Country Link
US (1) US20040238151A1 (fr)
EP (1) EP1455971B1 (fr)
AU (1) AU2002215877A1 (fr)
DE (1) DE60110849T2 (fr)
ES (1) ES2242706T3 (fr)
WO (1) WO2003053609A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060266427A1 (en) * 2005-05-26 2006-11-30 Wyeth Pharmaceuticals. Mixing apparatus
US20150108325A1 (en) * 2013-10-23 2015-04-23 Keith Ryan Method and apparatus for electrically-heated refractory moulds and mandrels

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3599649A (en) * 1969-04-10 1971-08-17 Nat Eng Co Apparatus for cooling granular material
US3613770A (en) * 1970-02-12 1971-10-19 Sherwin Williams Co Foundry sand article forming machine with pivotal blow reservoir
CH562068A5 (fr) * 1973-09-26 1975-05-30 Buehrer Erwin
US3994332A (en) * 1975-04-21 1976-11-30 The Quaker Oats Company Apparatus and method for manufacturing cores and molds with means for independently releasing catalyst and resin mixes
WO1981002122A1 (fr) * 1980-02-01 1981-08-06 Vnii Liteinogo Mash Tek Avtoma Installation de production de moules de coulee
US4643240A (en) * 1984-04-12 1987-02-17 Pettibone Corporation Method of blowing cores etc. using quick-set sand, and improved mold-blowing apparatus
US4971135A (en) * 1989-02-23 1990-11-20 Outboard Marine Corporation Lost foam casting apparatus
US5078201A (en) * 1989-11-27 1992-01-07 Osaka Shell Industry Co., Ltd. Casting core fabricating apparatus
JPH04143044A (ja) * 1990-10-04 1992-05-18 Kazuji Tanaka 自硬性鋳型の造型方法

Also Published As

Publication number Publication date
AU2002215877A1 (en) 2003-07-09
ES2242706T3 (es) 2005-11-16
DE60110849D1 (de) 2005-06-16
US20040238151A1 (en) 2004-12-02
WO2003053609A1 (fr) 2003-07-03
EP1455971A1 (fr) 2004-09-15
DE60110849T2 (de) 2006-02-23

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