EP0904871A1 - Vorrichtung zum Schiessen von Giessereisand in Kern- und Maskenschiessmachines - Google Patents

Vorrichtung zum Schiessen von Giessereisand in Kern- und Maskenschiessmachines Download PDF

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Publication number
EP0904871A1
EP0904871A1 EP97116715A EP97116715A EP0904871A1 EP 0904871 A1 EP0904871 A1 EP 0904871A1 EP 97116715 A EP97116715 A EP 97116715A EP 97116715 A EP97116715 A EP 97116715A EP 0904871 A1 EP0904871 A1 EP 0904871A1
Authority
EP
European Patent Office
Prior art keywords
cylindrical tube
inner cylindrical
molding sand
tube
air supply
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.)
Withdrawn
Application number
EP97116715A
Other languages
English (en)
French (fr)
Inventor
Yoshihura Yamamoto
Tatsumi Fujita
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.)
Sintokogio Ltd
Original Assignee
Sintokogio Ltd
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
Priority to JP8188806A priority Critical patent/JPH1015644A/ja
Application filed by Sintokogio Ltd filed Critical Sintokogio Ltd
Priority to EP97116715A priority patent/EP0904871A1/de
Publication of EP0904871A1 publication Critical patent/EP0904871A1/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
    • B22C15/23—Compacting by gas pressure or vacuum
    • B22C15/24—Compacting by gas pressure or vacuum involving blowing devices in which the mould material is supplied in the form of loose particles

Definitions

  • This invention relates to an improvement in a mechanism for blowing molding sand in a blowing machine, wherein moisturized molding sand, such as molding sand for a cold-box method and molding sand containing a furan resin, is blown into a model box by using compressed air.
  • the conventional mechanism for blowing molding sand of this kind comprises an outer cylindrical tube having a hollow chamber therein and holes communicating with the hollow chamber for supplying molding sand and compressed air, respectively, an inner cylindrical tube forming an inner cylindrical chamber therein and having many slits on its body portion, and a ring-form chamber for guiding an air flow, said chamber being disposed between the outer cylindrical tube and inner cylindrical tube and under the compressed air supply hole, thereby causing compressed air to be fed into the air-guiding chamber and then through the slits into the inside of the inner cylindrical chamber so as to fluidize the molding sand within the inner cylindrical chamber, while preventing a so-called shelving phenomenon.
  • slits about 0.3mm in width which is less than the sand particle size, are provided so as to prevent molding sand from being discharged through the slits along with the remaining compressed air when the compressed air remaining in the inner cylindrical chamber is discharged through the slits after molding sand has been blown into the model box.
  • a significant loss of pressure results when the compressed air passes through the slits in the inner cylindrical chamber. Therefore, it is impossible to provide compressed air having enough of a volume and pressure to fluidize the molding sand in the inner cylindrical chamber when molding sand is fed into the model box by feeding compressed air into the molding sand blowing mechanism. As a result, a problem occurs in that feeding enough molding sand to fill the model box is sometimes impossible.
  • This invention aims to solve the above-mentioned problems. Its purpose is to provide a mechanism for blowing molding sand, wherein the compressed air blown into the mechanism can pass through the inner cylindrical chamber with little resistance to its flow and wherein the inner cylindrical tube can be easily made, and wherein whether the model box is adequately filled with molding sand does not depend on the quantity of the molding sand in the inner cylindrical chamber.
  • the mechanism of this invention for blowing molding sand is used in a blowing machine for blow-forming molds so as to blow moisturized molding sand into a model box by using compressed air.
  • the molding sand blowing mechanism comprises an outer cylindrical tube extending vertically, an inner cylindrical tube disposed inside the outer cylindrical tube to form an annular space therebetween, an exhaust guiding chamber, and an air-supply guiding chamber provided respectively in an upper and lower relationship in the space, formed by dividing the space with a partition member, ventholes disposed in the upper portion of the inner cylindrical tube and communicating with the exhaust guiding chamber, an exhaust port disposed in the outer cylindrical tube and communicating with the exhaust guiding chamber, an air supply hole disposed in the outer cylindrical tube and communicating with the air-supply guiding chamber, and a plurality of nozzles disposed at the lower part of the inner cylindrical tube for jetting compressed air in the air-supply guiding chamber toward the periphery of the inside of the inner cylindrical tube, thereby agitating and fluidizing
  • a mechanism 1 for blowing molding sand is mounted on a traveling car (not shown) via a resilient supporting member such as coil springs so that the mechanism 1 is supported resiliently and movably in a vertical direction.
  • the mechanism 1 comprises an outer cylindrical tube 5 and an inner cylindrical tube 7 disposed inside the outer cylindrical tube 5 and having a flange 6, through which the inner tube 7 is detachably mounted therein.
  • the space inside the inner cylindrical tube 7 constitutes an inner cylindrical chamber 37.
  • On an upper portion of the inner cylindrical chamber 37 is provided a through hole 3 of a given size, through which hole molding sand is fed into the chamber 37.
  • An annular space 8 is formed between the outer cylindrical tube 5 and the inner cylindrical tube 7.
  • This annular space 8 is divided into an exhaust-guiding chamber 11 and an air supply guiding chamber 12.
  • the exhaust guiding chamber 11 is positioned above the air supply guiding chamber 12, by means of both a partition member 9 fixed to an outer upper portion of the inner cylindrical tube 7 and a sealing member 10 mounted on the outer end of the partition member 9.
  • the bottom portion of the outer cylindrical tube 5 is widened, with a proportionatly widened space therein, and in section has a rectangular shape.
  • On the bottom surface of the outer cylindrical tube 5 is mounted a blow plate 21 having a plurality of holes 20 for jetting molding sand therethrough.
  • a lower additional outer cylindrical tube 2 and an upper additional outer cylindrical tube 4 having the same diameter as the upper portion of the lower additional outer cylindrical tube 2 are provided on the outer periphery of the upper end of the outer cylindrical tube 5.
  • Both additional outer cylindrical tubes serve as a part of the outer cylindrical tube 5 for providing a compressed air-supply path to the inner cylindrical chamber 37 via the air supply guiding chamber 12.
  • the two additional outer cylindrical tubes 2 and 4 are airtightly connected to form one body.
  • the lower part of the lower additional outer cylindrical tube 2 converges in the downward direction at the outer cylindrical tube 5.
  • a plurality of ventholes 13, communicating with the exhaust guiding chamber 11, is formed in the upper part of the inner cylindrical tube 7, and wire netting 14, through which molding sand cannot pass, is wound around the outside of the area where the ventholes 13 are provided in the upper outer surface of the inner tube 7 to cover the holes 13.
  • a plurality of nozzles 19 are arranged in the lower part of the inner cylindrical tube 7.
  • Each of these nozzles 19 extends inwardly from the inner surface of the inner cylindrical tube 7 and each nozzle tip is horizontally bent as shown by an arrow in Fig. 3 so that it can jet compressed air in the air supply guiding chamber 12 toward the periphery of the inner surface of the inner cylindrical tube 7.
  • an exhaust port 15, communicating with the exhaust guiding chamber 11, is provided in the upper outer cylindrical tube 4.
  • the exhaust port 15 is provided with a valve 17 and a communicating tube 16 that connects the exhaust port 15 and the valve 17.
  • An air supply hole 18, communicating with the air supply guiding chamber 12, is provided on the upper surface of the upper additional outer cylindrical tube 4.
  • a compressed air supply mechanism 22 is fixed above the outer and inner cylindrical tubes 5,7.
  • the compressed air supply mechanism 22 comprises a tank 23 for storing compressed air, a box-shaped body 25 connected to the tank 23 via a communicating tube 24, a valve 27 for opening and closing a communicating hole 26 of the body 25, and a cylinder 28 containing a piston (not shown) for moving the valve 27 up and down.
  • Compressed air stored in the tank 23 is supplied to the air supply hole 18 provided in the upper additional outer cylindrical tube 4 via the body 25 when the valve 27 is moved up.
  • the outer and inner cylindrical tubes 5, 7 are moved up along with a model box (not shown) by means of elevating means (not shown) so as to make the upper surface of the outer cylindrical tube 5 abut the bottom surface of the body 25 of the compressed air supply mechanism 22, after molding sand S of a required amount has been fed into the inner cylindrical chamber 37 from the through hole 3 of the molding sand blowing mechanism 1.
  • the valve 17 is closed, compressed air in the tank 23 is supplied to the air supply hole 18 via the body 25 by contracting the piston in the cylinder 28 to move the valve 27 up so as to open the communicating hole 26.
  • the supplied compressed air passes through the air supply guiding chamber 12, and then it is jetted from nozzles 19 toward the periphery of the inner surface of the inner cylindrical tube 7, thereby the molding sand S in the inner cylindrical chamber 37 being jetted from sand jetting holes 20 to be blown into the model box after the sand S has been fluidized so as to whirl around in the direction of the arrow of Fig. 3. Since all the molding sand S in the inner cylindrical chamber 37 is fluidized by means of nozzles 19 disposed in the lower part of the inner cylindrical tube 7, whether the model box is adequately filled with molding sand does not depend on the quantity of the molding sand contained in the inner cylindrical chamber 37.
  • valve 27 is closed by expanding the piston in the cylinder 28 to close the through hole 26, and then the valve 17 is opened, after molding sand S has been blown into the model box.
  • the compressed air remaining in the outer and inner cylindrical tubes 5,7 is discharged from the valve 17 after passing through the air supply holes 13, the exhaust guiding chamber 11, and the exhaust port 15.
  • the nozzles 19 are disposed in the inside of the inner cylindrical tube 7.
  • many nozzles 39 constituted by tubes can be mounted on the outer surface of the lower part of the inner cylindrical tube 7 such that the tubes slant at a given angle toward the outer surface, the holes of which nozzles open to the inner cylindrical tube 7 without protruding into it.
  • This structure has an effect in that the inner surface of the inner tube can easily be cleaned.
  • the ventholes 13 and wire netting 14 of the inner cylindrical tube 7 may be replaced by many slits about 0.3mm in diameter, if the slits function like the wire net.
  • the thus-structured molding sand blowing mechanism of this invention has excellent effects in that the compressed air blown into the mechanism can pass through the inner cylindrical tube with little resistance to its flow, since the slits are replaced by nozzles with a much greater aperture, the inner cylindrical tube can be easily manufactured, and whether the model box is adequately filled with molding sand does not depend on the quantity of the molding sand in the inner cylindrical tube.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Devices For Molds (AREA)
EP97116715A 1996-06-28 1997-09-25 Vorrichtung zum Schiessen von Giessereisand in Kern- und Maskenschiessmachines Withdrawn EP0904871A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP8188806A JPH1015644A (ja) 1996-06-28 1996-06-28 吹込み式鋳型造型装置における砂吹込み機構
EP97116715A EP0904871A1 (de) 1996-06-28 1997-09-25 Vorrichtung zum Schiessen von Giessereisand in Kern- und Maskenschiessmachines

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP8188806A JPH1015644A (ja) 1996-06-28 1996-06-28 吹込み式鋳型造型装置における砂吹込み機構
EP97116715A EP0904871A1 (de) 1996-06-28 1997-09-25 Vorrichtung zum Schiessen von Giessereisand in Kern- und Maskenschiessmachines

Publications (1)

Publication Number Publication Date
EP0904871A1 true EP0904871A1 (de) 1999-03-31

Family

ID=26145799

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97116715A Withdrawn EP0904871A1 (de) 1996-06-28 1997-09-25 Vorrichtung zum Schiessen von Giessereisand in Kern- und Maskenschiessmachines

Country Status (2)

Country Link
EP (1) EP0904871A1 (de)
JP (1) JPH1015644A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1867410A1 (de) * 2007-01-16 2007-12-19 Sintokogio, Ltd. Vorrichtung zur Sandeinführung mit Luft sowie Verfahren und Vorrichtung zum Herstellen einer Form
CN103831403A (zh) * 2014-03-07 2014-06-04 南京亚力电气有限公司 结构简单，喷砂方便的水平分型脱箱造型机
CN105397038A (zh) * 2015-12-30 2016-03-16 苏州明志科技有限公司 一种防堵射砂排气机构及射砂排气方法
CN113680786A (zh) * 2021-07-15 2021-11-23 上海喆水科技集团有限公司 一种用于垃圾水解的高效处理系统

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103170583A (zh) * 2013-04-11 2013-06-26 苏州苏铸成套装备制造有限公司 改进落砂的冷芯盒射芯机
CN108500218B (zh) * 2018-06-14 2024-06-18 临海市微能铸机有限公司 一种多触头压实水平分型全自动无箱造型机

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE579844C (de) * 1931-11-25 1933-07-03 Zimmermann Gustav Sandblaseformmaschine
GB2001268A (en) * 1977-07-13 1979-01-31 Acme Cleveland Corp Mould making machine
GB2046152A (en) * 1979-03-26 1980-11-12 Acme Cleveland Corp A Molding Machine
JPS589745A (ja) * 1981-07-08 1983-01-20 Koei Sangyo Kk 鋳型造型用砂吹込装置
US4570694A (en) * 1982-01-25 1986-02-18 Lund Robert S Mold-blowing apparatus
EP0193140A2 (de) * 1985-02-26 1986-09-03 Alb. Klein GmbH & Co. KG Verfahren und Vorrichtung zum Füllen eines Formkastens od. dgl. Gefässes und Formstoff

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE579844C (de) * 1931-11-25 1933-07-03 Zimmermann Gustav Sandblaseformmaschine
GB2001268A (en) * 1977-07-13 1979-01-31 Acme Cleveland Corp Mould making machine
GB2046152A (en) * 1979-03-26 1980-11-12 Acme Cleveland Corp A Molding Machine
JPS589745A (ja) * 1981-07-08 1983-01-20 Koei Sangyo Kk 鋳型造型用砂吹込装置
US4570694A (en) * 1982-01-25 1986-02-18 Lund Robert S Mold-blowing apparatus
EP0193140A2 (de) * 1985-02-26 1986-09-03 Alb. Klein GmbH & Co. KG Verfahren und Vorrichtung zum Füllen eines Formkastens od. dgl. Gefässes und Formstoff

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 007, no. 085 (M - 206) 8 April 1983 (1983-04-08) *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1867410A1 (de) * 2007-01-16 2007-12-19 Sintokogio, Ltd. Vorrichtung zur Sandeinführung mit Luft sowie Verfahren und Vorrichtung zum Herstellen einer Form
WO2008087772A1 (en) * 2007-01-16 2008-07-24 Sintokogio, Ltd. Sand-introducing device using air, and method and apparatus for producing a mold
EA016210B1 (ru) * 2007-01-16 2012-03-30 Синтокогио, Лтд. Устройство для вдувания формовочного песка, безопочная формовочная установка (варианты) и способ безопочного формования
CN101578147B (zh) * 2007-01-16 2012-05-09 新东工业株式会社 利用空气的型砂导入设备及铸造铸型的方法及装置
CN103831403A (zh) * 2014-03-07 2014-06-04 南京亚力电气有限公司 结构简单，喷砂方便的水平分型脱箱造型机
CN103831403B (zh) * 2014-03-07 2016-01-20 南京亚力电气有限公司 结构简单，喷砂方便的水平分型脱箱造型机
CN105397038A (zh) * 2015-12-30 2016-03-16 苏州明志科技有限公司 一种防堵射砂排气机构及射砂排气方法
CN105397038B (zh) * 2015-12-30 2018-02-09 苏州明志科技有限公司 一种防堵射砂排气机构及射砂排气方法
CN113680786A (zh) * 2021-07-15 2021-11-23 上海喆水科技集团有限公司 一种用于垃圾水解的高效处理系统

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