DE2638871A1 - Sand-lime brick moulding plant - sprays forming tool with water or oil at high pressure before introducing charge in mould - Google Patents
Sand-lime brick moulding plant - sprays forming tool with water or oil at high pressure before introducing charge in mouldInfo
- Publication number
- DE2638871A1 DE2638871A1 DE19762638871 DE2638871A DE2638871A1 DE 2638871 A1 DE2638871 A1 DE 2638871A1 DE 19762638871 DE19762638871 DE 19762638871 DE 2638871 A DE2638871 A DE 2638871A DE 2638871 A1 DE2638871 A1 DE 2638871A1
- Authority
- DE
- Germany
- Prior art keywords
- sand
- oil
- water
- mould
- high pressure
- 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- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/38—Treating surfaces of moulds, cores, or mandrels to prevent sticking
- B28B7/388—Treating surfaces of moulds, cores, or mandrels to prevent sticking with liquid material, e.g. lubricating
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Press-Shaping Or Shaping Using Conveyers (AREA)
Abstract
Description
" Verfahren zum Herstellen von Kalksandsteinen lt"Process for the production of sand-lime bricks according to
Die Erfindung bezieht sich auf ein Verfahren zum Herstellen von Kalksandsteinen durch Pressen einer feuchten Mischung von Kalk und Sand. Diese Mischung wird in Pressen verformt, die in der Minute bis zu zehn Formlingen ausstoßen. Die Formen dieser Kalksandsteinpressen haben Innenteile aus hochlegierten Stählen, die einem starken Verschleiß ausgesetzt sind, weil der Hauptanteil der verwendeten Preßmasse Sand ist, der wie Schmirgel an den Formen wirkt. In diesen Formen befinden sich zur Herstellung von Hohlsteinen Dorne, die ebenfalls einem starken Verschleiß unterworfen sind. Aus Gründen der Wärmedämmung werden immer leichtere Steine gefordert, so daß diese Dorne immer größer werden und der Kalksandstein einen immer höheren Lochanteil hat. Hierdurch bedingt wird auch der erforderliche Ausstoßdruck immer höher, mit dem die Formlinge aus den Formzeugen der Presse gestoßen werden, da die Berührungsfläche zwischen der Kalksandmasse und dem Formzeug immer größer wird.The invention relates to a method for producing sand-lime bricks by pressing a damp mixture of lime and sand. This mixture is in Presses are deformed, which eject up to ten bricks per minute. The forms These sand-lime block presses have internal parts made of high-alloy steels that give you a are exposed to severe wear, because the majority of the molding compound used Is sand that works like emery on the shapes. In these forms there are for the production of hollow stones mandrels, which are also subject to heavy wear are. For reasons of thermal insulation ever lighter stones are required, so that these thorns get bigger and bigger and the sand-lime brick has an ever higher percentage of holes Has. As a result, the required ejection pressure is also getting higher and higher which the briquettes are pushed out of the molds of the press, as the contact surface between the sand-lime mass and the mold becomes larger and larger.
Die Haftreibungskräfte der Kalksandmasse werden so stark, daß für das Ausstoßen der Formlinge verwendete Maschinenteile sich verformen, um dann ruckartig in die alte Lage zurückzugehen. Hierdurch entsteht ein ruckartiger Ausstoß der Formlinge, der in ihnen Risse hervorruft oder sie ganz zerstört. Beobachtungen haben gezeigt, daß die Ausstoßkräfte nachlassen, je größer die Feuchtigkeit der in der Presse verformten Kalksandsteinmasse ist. Man kann jedoch eine bestimmte Feuchtigkeits- grenze in der Größenordnung von etwa 3 bis 6% je nach verwendetem Sand nicht überschreiten, da sonst Füllschwierigkeiten auftreten oder die Formlinge bei dem unter Sattdampfdruck durchgeführten Härteprozeß zerfallen, bei dem Kalziumhydrosilikat~gebildet wird.The static friction forces of the sand-lime mass are so strong that for the ejection of the moldings used machine parts to deform, to then jerky to go back to the old position. This creates a jerky ejection of the moldings, which causes cracks in them or completely destroys them. Observations have shown that the ejection forces decrease, the greater the humidity of the deformed in the press Sand-lime brick mass is. However, a certain moisture content can be border do not exceed in the order of about 3 to 6% depending on the sand used, otherwise filling difficulties occur or the briquettes under saturated steam pressure the hardening process carried out, during which calcium hydrosilicate ~ is formed.
Der Erfindung liegt die Aufgabe zugrunde, die zum Ausstoßen der Formlinge aus der Presse erforderlichen Kräfte zu verringern und ein Ausstoßen der Formlinge ohne jede Gefahr einer Rißbildung zu ermöglichen.The invention is based on the object of ejecting the moldings To reduce the forces required from the press and to eject the moldings without allowing any risk of cracking.
Gemäß der Erfindung wird auf das Formzeug der Kalksandsteinpresse nach dem Ausstoßen des Formlings und vor der Neufüllung mit der Preßmasse eine Flüssigkeit aufgebracht. Diese Flüssigkeit wird vorzugsweise kurzzeitig während etwa einer halben Sekunde mit hohem Druck in der Größenordnung von etwa 50 atü auf das Formzeug gesprüht. Hierdurch erhalten die Flüssigkeitsteilchen eine so hohe Beschleunigung, daß sie auch während des Formweges das Formzeug noch erreichen.According to the invention, the mold of the sand-lime block press is applied a liquid after the molding has been ejected and before it is refilled with the molding compound upset. This liquid is preferably briefly during about half a Second at high pressure in the order of about 50 atmospheres sprayed onto the mold. This gives the liquid particles such a high acceleration that they still reach the mold during the mold path.
Zum Einsprühen kann zweckmäßig reines Wasser oder Form- bzw.For spraying, it is advisable to use pure water or molding or
Schalungsöl verwendet werden.Formwork oil can be used.
Claims (5)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19762638871 DE2638871A1 (en) | 1976-08-28 | 1976-08-28 | Sand-lime brick moulding plant - sprays forming tool with water or oil at high pressure before introducing charge in mould |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19762638871 DE2638871A1 (en) | 1976-08-28 | 1976-08-28 | Sand-lime brick moulding plant - sprays forming tool with water or oil at high pressure before introducing charge in mould |
Publications (1)
Publication Number | Publication Date |
---|---|
DE2638871A1 true DE2638871A1 (en) | 1978-03-02 |
Family
ID=5986621
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19762638871 Withdrawn DE2638871A1 (en) | 1976-08-28 | 1976-08-28 | Sand-lime brick moulding plant - sprays forming tool with water or oil at high pressure before introducing charge in mould |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE2638871A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2521535A1 (en) * | 1982-02-12 | 1983-08-19 | Ceric | Method of handling soft or adherent products - uses surface of liq. jelly maintained at temp. near its melting point |
-
1976
- 1976-08-28 DE DE19762638871 patent/DE2638871A1/en not_active Withdrawn
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2521535A1 (en) * | 1982-02-12 | 1983-08-19 | Ceric | Method of handling soft or adherent products - uses surface of liq. jelly maintained at temp. near its melting point |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8141 | Disposal/no request for examination |