GB2251477A - A core shooting unit and valve therefor - Google Patents

A core shooting unit and valve therefor Download PDF

Info

Publication number
GB2251477A
GB2251477A GB9126245A GB9126245A GB2251477A GB 2251477 A GB2251477 A GB 2251477A GB 9126245 A GB9126245 A GB 9126245A GB 9126245 A GB9126245 A GB 9126245A GB 2251477 A GB2251477 A GB 2251477A
Authority
GB
United Kingdom
Prior art keywords
shooting unit
opening
core shooting
shooting
chamber
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Withdrawn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
GB9126245A
Other versions
GB9126245D0 (en
Inventor
Matthias Kuhne
Hardy Neumann
Gerald Richter
Gretel Winkler
Walter Winkler
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.)
GISAG AG
Original Assignee
GISAG AG
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 GISAG AG filed Critical GISAG AG
Publication of GB9126245D0 publication Critical patent/GB9126245D0/en
Publication of GB2251477A publication Critical patent/GB2251477A/en
Withdrawn legal-status Critical Current

Links

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

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Casting Devices For Molds (AREA)
  • Containers And Plastic Fillers For Packaging (AREA)
  • Basic Packing Technique (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Safety Valves (AREA)
  • Portable Nailing Machines And Staplers (AREA)

Description

22-51477 - 1 A CORE SHOOTING UNIT WITH NOVEL VALVE ARRANGEMENT This
invention relates to a core shooting unit incorporating a novel valve arrangement. The invention is primarily intended for use in the foundry industry for the production of foundry moulds and cores.
It is known to use axially arranged inlet and exhaust valves on core shooting units whereby the inlet valve disc and the valve control piston are connected by a rod, the sides thereof facing the rod being directly connected with the pressure chamber. The inlet and exhaust valve discs are thereby separate from one another and an intermediate chamber is formed between them which can be filled with compressed air. It is however a disadvantage that the opening times of the inlet and the exhaust valve differ sequentially so a part of the compressed air can escape.
The economy of the moulding and core shooter machine is thereby limited.
It is an object of the invention therefore to provide a core shooting unit with a novel valve arrangement which enables the greatest possible cross section to be left free on the closure valve for the compressed air entering the shooting chamber and an overlapping of the movement of the two valves to be avoided not only during ',shooting" but also during 'venting".
According to the invention there is provided a core shooting unit for moulding machines comprising a pressure container and control piston below which is located a pressure chamber having first and second openings therein, the first opening incorporating a quick action valve and the second opening being connected by means of a duct with a shooting chamber, said second opening being completely covered by a sealing element.
A preferred embodiment of the invention will now be described, by way of example only, with reference to the accompanying drawing in which there is shown a core shooting unit in its closed position.
The illustrated core shooting unit is installed on the upper part of a known core shooting machine (not shown).
The shooting unit consists of a pressure chamber 1 and a control piston 2 which is pressed against a sealing plate 3 by an acting pressure with the assistance of a spring 4.
Below the control piston 2 is arranged a pressure chamber provided with two openings 6,7. A quick action valve (not shown) is attached to opening 6 for the admission and removal of the control air. The opening 7 is connected with the shooting chamber 8 by a duct 9 closed by a sealing element 10 made of an abrasion-resistant material and formed with a lip or flap. In the shooting unit, the sealing element 10 is fixed in such a manner that it lies against and completely covers the opening 7 in the pressure chamber 5.
To initiate the shooting impulser the pressure chamber 5 is filled with compressed air and the sealing element 10 is pressed against the opening 7 to close it. After build up of the pressure, the control piston 2 is lifted and the shooting air can flow suddenly from the shooting chamber 8 into a sand container (not shown) located below the shooting unit. At the end of the shooting cycle, the control air is released from the pressure chamber 5 by means of the quick action exhaust valve (not shown) associated with the opening 6. The control valve 2 then sinks downwardly again _and. rests on the sealing plate 3. After release of the pressure in the pressure chamber 5, the sealing element 10 is raised and the shooting chamber 8 is vented through the opening 7 by means of the back. flowing shooting air.
By means of the invention, the shooting process can proceed as an automatic sequence whereby no uncontrolled initiation of the shot can take place. Furthermore, the venting of the shooting chamber 8 takes place with little noise.
- 5

Claims (4)

1. A core shooting unit for moulding machines comprising a pressure container and control piston below which is located a pressure chamber having f irst and second openings therein, the first opening incorporating a quick action valve and the second opening being connected by means of a duct with a shooting chamber, said second opening being completely covered by a sealing element.
2. A core shooting unit according to claim 1 wherein the sealing element is made of an abrasion-resistant material and is lip-shaped to cover and seat against the second opening.
3. A core shooting unit substantially as herein described with reference to the accompanying drawing.
4. A valve arrangement for a core shooting unit substantially as herein described with.reference to the accompanying drawings.
GB9126245A 1990-12-15 1991-12-11 A core shooting unit and valve therefor Withdrawn GB2251477A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE4040214A DE4040214A1 (en) 1990-12-15 1990-12-15 COMPRESSED AIR INLET AND EXHAUST VALVE ARRANGEMENT FOR MOLDING MACHINES, IN PARTICULAR CORE SHOOTING MACHINES

Publications (2)

Publication Number Publication Date
GB9126245D0 GB9126245D0 (en) 1992-02-12
GB2251477A true GB2251477A (en) 1992-07-08

Family

ID=6420481

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9126245A Withdrawn GB2251477A (en) 1990-12-15 1991-12-11 A core shooting unit and valve therefor

Country Status (5)

Country Link
DE (1) DE4040214A1 (en)
ES (1) ES2082672B1 (en)
FR (1) FR2670412B1 (en)
GB (1) GB2251477A (en)
IT (1) IT1250525B (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1473462A (en) * 1974-04-12 1977-05-11 Fomes Sa Foundry Metallurg Sup Sand blowing head
GB2074701A (en) * 1980-04-23 1981-11-04 Bouteille D Compressed gas saving device
EP0067934A2 (en) * 1981-04-29 1982-12-29 Univer S.R.L. Compressed-air economizing device

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU889266A2 (en) * 1980-04-09 1981-12-15 За витель f - В.Д.Тищенко и Г.Ф.Гриненко Pulse head
ES2010525A6 (en) * 1986-08-12 1989-11-16 Erana Agustin Arana Shooting mechanism for male shooting machines. (Machine-translation by Google Translate, not legally binding)
ES2012702A6 (en) * 1989-04-06 1990-04-01 Erana Agustin Arana Improvements in air impact sand-box moulding machines.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1473462A (en) * 1974-04-12 1977-05-11 Fomes Sa Foundry Metallurg Sup Sand blowing head
GB2074701A (en) * 1980-04-23 1981-11-04 Bouteille D Compressed gas saving device
EP0067934A2 (en) * 1981-04-29 1982-12-29 Univer S.R.L. Compressed-air economizing device

Also Published As

Publication number Publication date
DE4040214A1 (en) 1992-06-17
IT1250525B (en) 1995-04-08
FR2670412B1 (en) 1994-10-28
GB9126245D0 (en) 1992-02-12
ES2082672A1 (en) 1996-03-16
ES2082672B1 (en) 1997-03-01
ITTO910971A1 (en) 1992-06-16
ITTO910971A0 (en) 1991-12-13
FR2670412A1 (en) 1992-06-19

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)