EP0040352B1 - Vorrichtung zum Abgeben von Metallmengen - Google Patents

Vorrichtung zum Abgeben von Metallmengen Download PDF

Info

Publication number
EP0040352B1
EP0040352B1 EP19810103405 EP81103405A EP0040352B1 EP 0040352 B1 EP0040352 B1 EP 0040352B1 EP 19810103405 EP19810103405 EP 19810103405 EP 81103405 A EP81103405 A EP 81103405A EP 0040352 B1 EP0040352 B1 EP 0040352B1
Authority
EP
European Patent Office
Prior art keywords
molten metal
tank
pressure
gas
air
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
EP19810103405
Other languages
English (en)
French (fr)
Other versions
EP0040352A1 (de
Inventor
Tsuguharu Kohgyo-Dennetsu-Bu Gijutsu-Ka Ohmori
Sadaumi Kohgyo-Dennetsu-Bu Gijutsu-Ka Ueno
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.)
Fuji Electric Co Ltd
Original Assignee
Fuji Electric Co 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
Application filed by Fuji Electric Co Ltd filed Critical Fuji Electric Co Ltd
Publication of EP0040352A1 publication Critical patent/EP0040352A1/de
Application granted granted Critical
Publication of EP0040352B1 publication Critical patent/EP0040352B1/de
Expired legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D39/00—Equipment for supplying molten metal in rations
    • B22D39/06—Equipment for supplying molten metal in rations having means for controlling the amount of molten metal by controlling the pressure above the molten metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D18/00—Pressure casting; Vacuum casting
    • B22D18/04—Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould

Definitions

  • This invention relates to an apparatus for dispensing molten metal into a mold or the like. It includes a molten metal storage container, and a pouring passage extending upwardly from the bottom of the storage container and having an outlet in a position above the highest level of molten metal in the storage container. Compressed gas is introduced into a closed hollow space in the storage container to apply pressure to molten metal therein to discharge it through the outlet of the pouring passage.
  • a dispensing system of this type as further defined in the precharacterising part of claim 1 is described in the DE-A-2624435.
  • Another known system as described in DE-A-2433060 employs air as a gas for compressing molten metal. When it is desired to discontinue dispensation of molten metal, the compressed air in the storage container is released into the atmosphere. If it is desired to dispense molten metal again, it is necessary to introduce a fresh supply of compressed air into the storage container. If fresh air is introduced into the storage container whenever it is desired to dispense molten metal, however, the storage container always remains filled with a gas containing a large quantity of oxygen.
  • This gas oxidizes the molten metal contacting it, and disadvantageously brings about generation of a large quantity of slag, and the loss of effective constituents from molten metal.
  • the apparatus is, therefore, unsuitable for use in the dispensation of easily oxidizable molten metal, or molten metal containing an easily oxidizable constituent, though it can relatively easily and accurately control the amount to be dispensed.
  • Attempts have, therefore, been made to introduce compressed argon or other inert gas into the storage container in order to prevent such oxidation.
  • such an inert gas is expensive, and disadvantageously increases the cost of operation, as it requires a large quantity of such gas.
  • a molten metal dispensing apparatus including a molten metal storage container and a pouring passage extending upwardly from the bottom of said container to a point above the highest level of molten metal in said container, and adapted for dispensing molten metal through said pouring passage when compressed air is introduced into a closed hollow space above said molten metal in said container to apply pressure to said molten metal, a high pressure tank in which said compressed air is stored before it is introduced into said storage container, a low pressure tank into which said compressed air is recovered from said storage container, and a compressor for compressing said air from said low pressure tank and returning it into said high pressure tank, whereby a substantially constant negative pressure is maintained in said low pressure tank, and that a pressure regulator is connected between a suction valve and the low pressure tank, said suction valve being vented to the atmosphere or open air.
  • the system comprises a storage container 1 lined with refractories.
  • the storage container 1 defines a storage chamber 2 for storing molten metal 6 therein, and is provided with a pouring passage 3 extending upwardly from the bottom of the storage chamber 2 and having an outlet 31 at a point above the highest level 7 of molten metal 6, and a receiving passage 4 extending upwardly from the bottom of the storage chamber 2 and having an inlet 41 at a higher level than the outlet 31 of the pouring passage 3.
  • Molten metal is received through the receiving passage 4, and stored in the storage chamber 2.
  • the top opening of the storage chamber 2 is closed by a cover 5 in a gastight manner, so that a closed hollow space may be formed above the molten metal in the storage chamber 2.
  • a gas feed line 21 and an exhaust line 22 extend through the cover 5 into the storage chamber 2.
  • the gas feed line 21 is connected to a high pressure gas tank 8, in which compressed gas is stored, through a device 9 for controlling the pressure of the gas to be introduced into the storage chamber 2.
  • the exhaust line 22 is connected through an exhaust valve 10 to a low pressure gas tank 11 into which exhaust gas is collected.
  • the low pressure gas tank 11 has an outlet connected to the inlet of a gas compressor 15 through a primary cooler 12, a drain separator 13 and a filter 14.
  • the gas compressor 15 has an outlet connected to the high pressure gas tank 8 through a secondary cooler 16.
  • a pressure regulator 17 is provided for detecting the pressure of the gas in the high pressure gas tank 8, and maintaining it at a predetermined level of say, 3.5 kg/cm 2 by causing the operation of the compressor 15 to be stopped if the gas pressure exceeds the predetermined level, while causing it to be started again if the gas pressure has dropped below the predetermined level.
  • a suction valve 19 is connected to the low pressure gas tank 11 for drawing air thereinto.
  • a pressure regulator 18 is connected between the suction valve 19 and the low pressure gas tank 11 for detecting the pressure of the gas in the tank 11 and maintaining it at a substantially equal negative pressure of, say, -0.3 kg/cm 2 by causing the valve 19 to open if the gas pressure in the tank 11 has dropped below the aforesaid level, while causing it to be closed if the gas pressure exceeds the aforesaid level.
  • the compressor 15 In preparation for the pouring operation, the compressor 15 is started for drawing air from the low pressure gas tank 11, and compressing it, so that the compressed air may be stored in the high pressure gas tank 8.
  • the pressure regulator 9 and the exhaust valve 10 remain closed. Until the pressure of the gas in the high pressure gas tank 8 reaches a predetermined level of, say, 3.5 kg/cm 2 , the compressor 15 continues in operation, and draws air from the low pressure gas tank 11. Therefore, a gradual reduction takes place in the quantity and pressure of the air in the tank 11. If the pressure of the air in the tank 11 drops below a predetermined level of, say -0.3 kg/cm 2 , the pressure regulator 18 causes the suction valve 19 to open, and draw a fresh supply of air into the tank 11.
  • the compressor 15 stops its operation when the high pressure gas tank 8 has been filled with air to the extent that its pressure reaches a predetermined level of, say, 3.5 kg/cm 2 whereupon the apparatus is ready for the dispensing operation.
  • the pressure of the air in the low pressure gas tank 11 is maintained at a predetermined negative pressure of -0.3 kg/cm z.
  • the pressure regulator 9 is controlled to introduce compressed air from the high pressure gas tank 8 into the closed storage chamber 2 through the feed line 21 for raising the pressure of the gas in the storage chamber 2, whereby pressure is applied to the molten metal 6.
  • the level 7 of the molten metal in the storage chamber 2 is lowered, and the levels of the molten metal in the pouring passage 3 and the receiving passage 4 are raised correspondingly. If the molten metal in the pouring passage 3 reaches its outlet 31, it is forced out therethrough into a mold not shown, or the like.
  • the pressure regulator 9 continues to introduce compressed air into the storage chamber 2 to maintain therein the pressure required for forcing molten metal out of the pouring passage 3.
  • the pressure regulator 9 When it is desired to discontinue the pouring operation, the pressure regulator 9 is actuated in such a manner as to interrupt the supply of compressed air from the high pressure gas tank 8, and the exhaust valve 10 is opened.
  • the high pressure air in the storage chamber 2 is drawn into the low pressure gas tank 11 in which a negative pressure is maintained, and reduces its pressure.
  • the air in the storage chamber 2 ceases to apply pressure to the molten metal 6 therein, and its level 7 rises, while the level of the molten metal in the pouring passage 3 drops below its outlet 31, whereby the pouring operation is terminated.
  • the exhaust valve 10 Upon termination of the pouring operation, the exhaust valve 10 is closed again, so that the apparatus may be ready for another cycle of pouring operation.
  • the aforesaid sequences of operation are repeated for dispensing molten metal, and discontinuing any such dispensation.
  • the quantity of the molten metal to be dispensed can be controlled by the pressure regulator 9 which controls the duration of pressure application into the storage chamber 2.
  • the compressed gas supplied from the high pressure gas tank 8 into the storage chamber 2 is never released into the open atmosphere, but is recovered into the low pressure gas tank 11, so that it may be compressed by the compressor 15 again, and recycled into the high pressure gas tank 8.
  • the gas is circulated along a closed loop.
  • the closed loop circulation of the gas provides a number of advantages. Oxygen, which is present in a large quantity in the air during the initial stage of operation, is gradually reduced by reacting with molten metal in the storage container 1 during its recirculation in the closed loop. Accordingly, the oxidation of the molten metal 6 in the storage container 1 can be effectively prevented.
  • the pressure of the gas in the low pressure gas tank 11 drops below a predetermined level.
  • the pressure regulator 18 detects any such pressure drop in the tank 11, and causes the suction valve 19 to open to draw air therethrough to supply a satisfactory amount of additional air into the tank 11.
  • the amount of any such additional air is very small, and does not bring about any appreciable increase in the quantity of oxygen in the closed loop.
  • the primary cooler 12 provided on the inlet side of the compressor 15 cools the gas from the low pressure gas tank 11 before its transfer into the compressor 15 to thereby protect the compressor 1 against overheating, since the gas recovered from the storage container 1 remains hot due to the high temperature of the molten metal therein.
  • the secondary cooler 16 provided on the outlet side of the compressor 15 cools the gas heated during its compression.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)

Claims (2)

1. Vorrichtung zum Abgeben von Metallmengen mit einem Behälter (1) für die Metallschmelze und einem Ausgusskanal (3) welcher sich vom Boden des Behälters (1) bis zu einem über dem Höchstniveau (7) der Metallschmelze (6) im Behälter (1) gelegenen Punkt erstreckt und dazu bestimmt ist, Metallschmelze durch diesen Ausgusskanal (3) abzugeben wenn Druckluft in einen geschlossenen Hohlraum über der Metallschmelze im Behälter (1) eingelassen wird, um Druck auf die Metallschmelze auszuüben, einem Hochdruckgefäss (8) in welchem die Druckluft vor dem Einlassen in den Behälter (1) aufbewahrt wird, einem Niederdruckgefäss (11) in welchem die Druckluft aus dem Behälter (1) wiedergewonnen wird und einem Kompressor (15) um die Luft aus dem Niederdruckgefäss (11) zu komprimieren und in das Hochdruckgefäss (8) zurückzubefördern, dadurch gekennzeichnet, dass ein substantieller, konstanter, negativer Druck im Niederdruckgefäss (11) aufrechterhalten wird und dass ein Druckregler (18) zwischen einem Saugventil (19) und dem Niederdruckgefäss (11) eingebaut ist, wobei das Saugventil zur Atmosphäre oder Aussenluft hin entlüftet wird.
2. Vorrichtung zum Abgeben von Metallmengen gemäss Anspruch 1, dadurch gekennzeichnet, dass der Kompressor (15) so betrieben wird, dass ein substantieller, konstanter, positiver Druck im Hochdruckgefäss aufrechterhalten wird.
EP19810103405 1980-05-14 1981-05-06 Vorrichtung zum Abgeben von Metallmengen Expired EP0040352B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP6376780A JPS6021819B2 (ja) 1980-05-14 1980-05-14 注湯炉
JP63767/80 1980-05-14

Publications (2)

Publication Number Publication Date
EP0040352A1 EP0040352A1 (de) 1981-11-25
EP0040352B1 true EP0040352B1 (de) 1984-02-08

Family

ID=13238849

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19810103405 Expired EP0040352B1 (de) 1980-05-14 1981-05-06 Vorrichtung zum Abgeben von Metallmengen

Country Status (3)

Country Link
EP (1) EP0040352B1 (de)
JP (1) JPS6021819B2 (de)
DE (1) DE3162162D1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4444377A (en) * 1982-07-14 1984-04-24 Daniel E. Groteke Molten metal transfer crucible
JPS6334564U (de) * 1986-08-20 1988-03-05
SE470179B (sv) * 1992-02-20 1993-11-29 Metpump Ab Pumpanordning för pumpning av smält metall

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2624435B2 (de) * 1976-06-01 1981-03-26 Brown, Boveri & Cie Ag, 6800 Mannheim Verfahren zum dosierten Vergießen schelzflüssiger Metalle
CH646624A5 (en) * 1980-03-13 1984-12-14 Fischer Ag Georg Process for casting molten metal under the pressure of a protective gas and apparatus for carrying out the process

Also Published As

Publication number Publication date
EP0040352A1 (de) 1981-11-25
JPS6021819B2 (ja) 1985-05-29
DE3162162D1 (en) 1984-03-15
JPS56160867A (en) 1981-12-10

Similar Documents

Publication Publication Date Title
US4363222A (en) Environmental protection refrigerant disposal and charging system
US4261178A (en) Environmental protection refrigeration disposal and charging system
US4659346A (en) Device for preventing fuel vapor from escaping to the outside air from a fuel tank
US20150140184A1 (en) Method And Apparatus For Accelerated Or Controlled Degassing Of Roasted Coffee
US4793596A (en) Apparatus for and a method of rapidly discharging a molten metal from its supply system of a pressurized holding furnace
EP0040352A1 (de) Vorrichtung zum Abgeben von Metallmengen
JPS6329117B2 (de)
US4860804A (en) Filled amount control system
US5056692A (en) Dispensing apparatus for molten metal
US4067807A (en) Process and apparatus for the operation of a filter press having a pressure tank communicating therewith
CA2062954A1 (en) Float valve for container-filling systems, in particular systems for filling electric drive batteries
AU3682097A (en) Valve apparatus
JPH03198192A (ja) 自動販売機内に缶入り飲料を送り込むための装填器
US3921859A (en) Siphon for molten metals with suction actuator
JP2869042B2 (ja) 液状またはペースト状の生成物を貯蔵し、その所定量を分配する装置
JP2703431B2 (ja) ナトリウム−硫黄電池における消火装置
ZA200600074B (en) System for supplying molten metal, container and a vehicle
JPS6458695A (en) Drink dispenser
US3229337A (en) Furnace ladling apparatus
KR102288731B1 (ko) 수처리 장치
KR0168556B1 (ko) 다이캐스트용 용탕 주입장치
JPH03106399A (ja) コードレススチームアイロン
US5358027A (en) Vacuum-assisted gravity pour casting apparatus
JPH09126394A (ja) 低温液化ガス貯蔵設備
US4848603A (en) Holding furnace of constant molten metal level

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19810910

AK Designated contracting states

Designated state(s): DE FR GB IT SE

ITF It: translation for a ep patent filed
GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Designated state(s): DE FR GB IT SE

REF Corresponds to:

Ref document number: 3162162

Country of ref document: DE

Date of ref document: 19840315

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19900404

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19900430

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19900504

Year of fee payment: 10

ITTA It: last paid annual fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19910506

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19910507

GBPC Gb: european patent ceased through non-payment of renewal fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19920131

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19940511

Year of fee payment: 14

EUG Se: european patent has lapsed

Ref document number: 81103405.7

Effective date: 19911209

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19960201