EP0203980B1 - Device for providing individual spray systems of pressure casting machines with a liquid containing water and additives - Google Patents

Device for providing individual spray systems of pressure casting machines with a liquid containing water and additives Download PDF

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Publication number
EP0203980B1
EP0203980B1 EP86900103A EP86900103A EP0203980B1 EP 0203980 B1 EP0203980 B1 EP 0203980B1 EP 86900103 A EP86900103 A EP 86900103A EP 86900103 A EP86900103 A EP 86900103A EP 0203980 B1 EP0203980 B1 EP 0203980B1
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EP
European Patent Office
Prior art keywords
die casting
additives
water
valve
liquid
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
EP86900103A
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German (de)
French (fr)
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EP0203980A1 (en
Inventor
Helmut Thurner
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Bayrisches Druckguss-Werk Thurner & Co KG GmbH
Bayerisches Druckgusswerk Thurner KG
Original Assignee
Bayrisches Druckguss-Werk Thurner & Co KG GmbH
Bayerisches Druckgusswerk Thurner KG
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Priority to AT86900103T priority Critical patent/ATE43267T1/en
Publication of EP0203980A1 publication Critical patent/EP0203980A1/en
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Publication of EP0203980B1 publication Critical patent/EP0203980B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/2007—Methods or apparatus for cleaning or lubricating moulds
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/85978—With pump
    • Y10T137/86131—Plural

Definitions

  • the invention relates to a device for supplying sprayers for die casting machines, each with a liquid containing water and additives for cooling, cleaning and / or lubricating purposes, for application to the inner wall of open molds, according to the preamble of claim 1.
  • the opened mold is wetted on the inside with a liquid containing water and additives, dissolved, suspended or emulsified therein.
  • the liquid is used for separation, cooling and / or lubrication.
  • the composition of the liquid depends on the material and shape of the castings, in particular on their wall thickness, and on the conditions for quick and easy demolding.
  • the liquid is sprayed onto the walls of the mold. It is known to connect a spray device arranged on a die casting machine to a container from which the liquid is conveyed by means of compressed air to the nozzles of the spray device (practice of die casting production by E. Brunhuber, 1980, ausverlag Schiele and Schön GmbH, page 128).
  • Liquids with different compositions and different spraying devices adapted to the respective casting mold are often required for different casting molds. If the liquid supply in the container is not exhausted when the mold is changed, the container must be emptied and filled with a mixture which is matched to the other mold. In addition, the capacity of the container may not be sufficient for a larger series of the same mold. The die casting process must then be stopped in automatic mode when the liquid supply in the container is exhausted.
  • US-A-4,186,769 describes a process in which a concentrate is added to a dilute liquid as it is being pumped from a first container to a casting machine or into a second container in such a way that a liquid of the desired concentration is present which is fed to the casting machines in order to be conducted there in a closed circuit.
  • the invention has for its object to develop a suitable for automatic operation device for supplying one or more sprayers for die casting machines, each with a liquid containing water and additives for cooling, cleaning and / or lubricating purposes.
  • the object is achieved by the measures described in claim 1.
  • the device specified in claim 1 it is possible to set the desired mixing ratio with the mixing valve on the respective die casting machine. In this case, only the amount of liquid specially tailored to the respective casting mold is required for the individual spraying operation.
  • the setting can be made in a short time. The production process is therefore no longer affected by time-consuming refilling or decanting of the liquid for the spraying operation.
  • the die casting machines can be better exploited with the device described in claim 1, since there are fewer set-up times.
  • the principle of the invention is to store liquids with the highest necessary concentration and to carry out the required dilution with water for each casting process before spraying.
  • a number of central containers is provided corresponding to the type of casting materials to be processed in the die casting machines, in which in each case liquids from water and additives are stored in the highest concentration required for the respective casting material in a corresponding shape, the central containers are connected via switching valves to a pipeline system to which the mixing valves are closed.
  • the type of die casting material to be processed e.g.
  • the changeover to the suitable spray liquid takes place by opening the valve between the manifold and the central container provided for the respective material and by adapting the mixing valve setting to the material and the mold used.
  • the spray liquid a change can be carried out quickly and easily.
  • the central containers are preferably arranged higher than the die casting machines.
  • the liquids thus get from the containers to the mixing valves under the influence of gravity. This eliminates the need for complex and energy-consuming subsidies.
  • the delivery device is designed as a piston pump, the cylinder of which is either vertical or can assume any other position if it is ensured that gravity does the necessary work via the media.
  • no pump is required for the conveyance and mixing of the respective liquids until the interior of the cylinder is filled with the mixture. These processes take place under the influence of gravity. The device therefore works particularly economically.
  • the piston of the respective piston pump preferably has two disks which are arranged at a distance from one another, one of which faces the cylinder space intended for holding the liquid and the other faces the cylinder space which can be acted upon by a compressed gas and with which the space delimited by the two disks over a check valve can be connected when the excess pressure is removed.
  • liquid which penetrates into the intermediate space during the pumping out of the cylinder chamber filled with liquid can get into the cylinder chamber which is no longer under gas pressure and can escape therefrom after the pumping process.
  • the piston consisting of two disks, the problem of sealing against the liquid and against the compressed gas can be easily solved.
  • the cylinder space to which pressurized gas can be applied can expediently be connected to the compressed air source provided for the sprayer via a changeover valve.
  • the same source of compressed air can therefore be used to actuate the pump and the sprayer.
  • a check valve is arranged at the outlet of the cylinder chamber to which liquid can be applied.
  • the pump can be installed at a suitable location below the sprayer.
  • the check valve prevents liquid from flowing back from the sprayer to the pump or that the sprayer releases drops.
  • a preferred embodiment of a mixing valve consists in that a cylindrical body rotatably arranged in a housing has a central cavity which is open on one side and a radial slot which can be rotated in relation to two inlet openings in a housing wall for the liquid and for water, with the inlet cross-sections changing in opposite directions is, with check valves upstream of the inlet openings.
  • the check valves prevent the liquid in the cylinder from flowing back when the cylinder is pumped out into the central container.
  • the cylindrical body can be provided with a lever, one end of which is designed as a display tip for a scale. This embodiment enables the mixing ratio to be set by hand.
  • the cylindrical body with a motor drive and to detect the angular position of the cylindrical body via a position indicator.
  • a potentiometer which gives an analog display, or a coding disk, with which the position can be recorded digitally, is suitable as the position reporting device.
  • a geared motor can be used as the motor drive.
  • the cylinder of the pumps is preferably composed of two disks and a cylindrical jacket arranged between the disks. This embodiment can be produced economically. It is sufficient if the cylindrical jacket is relatively thin-walled. Stops can be provided in the cylinder to limit the stroke of the piston. The suction volume of the cylinder and thus the amount of liquid to be sprayed can be specified by adjusting the stops.
  • the two halves of the molds 18, 20 are not identified in more detail.
  • the two die casting machines 10, 12 each have a machine bed and stands arranged thereon.
  • the fixed mold halves and hydraulic elements are attached to the stands.
  • a slide and the movable mold half attached to it are moved with the hydraulic elements during the production of the die castings.
  • the machine bed, the stand and the hydraulic elements are designated in more detail in FIG. 1.
  • the spray devices 14, 16 With the spray devices 14, 16, a liquid is sprayed onto the mold surfaces for cooling, cleaning and / or lubricating purposes.
  • the spray devices 14, 16, which are provided with directionally adjustable spray nozzles, are each fastened to supports 22, 24 so as to be horizontally and vertically displaceable and pivotable.
  • the carriers 22, 24 are each arranged on one of the machine stands.
  • the liquids to be sprayed consist of water with additives, which can be graphite, pigments or the like in connection with special active substances and carriers. In many cases, emulsifiable, pigment-free additives are also used.
  • Liquids with different compositions are often required for different forms 18, 20 and different casting materials.
  • the sprayers 14, 16 also often have to be replaced or readjusted to adapt to a different mold.
  • a device which has at least one central container 26 for the spray devices 14, 16.
  • the container 26 contains water with the additives in the highest required concentration. The concentration is set to the mold and the casting material that require the highest proportion of additives for the production of perfect castings.
  • the additives can e.g. B. be diluted 1:50 or 1:80 with water. If different additives are required for different casting materials, eg aluminum or zinc die casting, further central containers with liquids are to be provided in which the corresponding additives are dissolved in the highest necessary concentration. In Fig. 1 only a further central container 28 is shown. If necessary, several central containers can be provided.
  • the central containers 26, 28 are connected on the output side via pipes 30, 32 to a changeover valve 34, the outlet of which is connected to a central pipe system 36 which contains branches, not specified, which run to the die casting machines 10, 12 and further die casting machines, not shown .
  • Mixing valves 38, 40 are located on the die casting machines 10, 12 and the other die casting machines, each of which is connected to the pipeline system 36 with an inlet.
  • the mixing valves 38, 40 are each connected to a pipe system 42, which is fed by a central container 44, in which water is located, with a second input.
  • the central containers 26, 28, 44 are located at the same height above the die casting machines 10, 12.
  • the water from the container 44 and the liquid selected in each case via the changeover valve 34 come in under the influence of gravity and with the essentially the same pressure the mixing valves 38, 40 on the die casting machines 10, 12.
  • the concentration of the additives in the water required for the respective manufacturing process is generated by admixing water from the container 44.
  • the mixing valves 38, 40 are each followed by pumps 46, 48, which are arranged, for example, at the level of the machine bed of the respective die casting machine 10, 12. On the output side, pumps 46, 48 are each connected to sprayers 14, 16 via pipes 50, 52.
  • the pipes 30, 32, the changeover valve 34, the pipe system 36, the mixing valves 38, 40, the pipe system 42, the container 44 and the pumps 46, 48, as well as the containers 26, 28, belong to the device with which the die casting machines 10 , 12 are supplied centrally and automatically each with water and additives in a liquid containing a concentration that can be set on the mixing valves 38, 40.
  • the container 44 is provided with a device 54 for regulating the water level in the container 44. If the water level drops below a certain level, this is determined by a fill level sensor which belongs to the device 54.
  • the fill level sensor opens a tap in a feed line for the container 44 fed by the water supply system until the desired fill level is reached.
  • Fill level sensors 56 which control dosing devices 58, are also arranged in the containers 26 and 28.
  • the dosing devices 58 generate the liquids intended for the containers 26, 28 from the additives and the water fed in.
  • the pumps 46, 48 each have a cylindrical jacket 60, which is clamped between an upper disk 62 and a lower disk 64 using seals, not specified.
  • the disks 62, 64 are rectangular. At the four corners, the letters 62, 64 are connected to one another via stud bolts 66.
  • the pumps 46, 48 stand with their cylinders on the die casting machines 12, 10.
  • the mixing valve 38 or 40 is fastened to the upper disk 62.
  • the mixing valves 38, 40 are each provided with a connecting piece 68 for the liquid supplied by the containers 26 or 28 and with a connecting piece 70 for the water supplied by the container 44.
  • a bearing 74 is fixed in a cylindrical housing 72 of the mixing valves 38, 40, in which a cylindrical body 76 is rotatably arranged.
  • the cylindrical body 76 consists of two sections 78, 80 with different diameters.
  • the section 78 with the larger diameter has a cylindrical recess 82 which is open on the side of the mixing valve 38 or 40 facing the pump 46, 48.
  • In section 78 there is a slot 84 running over the entire half of the circular ring of the wall surrounding the recess 82.
  • the slot 84 there are cylindrical recesses 86, 88 for the liquid at diametrically opposite locations of the housing 72 and the bearing 74 - and water inlet.
  • the recesses 86, 88 are each connected to the cavities of the connecting pieces 68, 70, which are unspecified, and which are screwed into the housing 72.
  • the mixing ratio between the liquid arriving via the connecting piece 68 and the water arriving via the connecting piece 70 can be changed.
  • the end faces of the connecting pieces 68, 70 which are located in the interior of the housing 72 and are not designated in any more detail, are each designed as valve seats for valve plates 90, 92, which are pressed against the valve seats under spring preload.
  • the valve plates 90, 92, the valve seats and the unspecified springs, the ends of which are located on the valve plates 90, 92 and on the spring washers 94 in the Support recesses 86, 88 represent check valves.
  • the housing 72 is closed on its side facing away from the pump 46 or 48 with a plate-shaped cover 96 which has an opening (not specified in more detail) through which the section 80 of the body 76 projects outwards.
  • a lever 98 is inserted into an approximately radial bore in section 80 and then screwed on. The lever 98 protrudes from the section 80 on both sides.
  • the angular position of the slot 84 can be brought into accordance with a desired mixing ratio by means of the lever 98.
  • a motor 106 e.g. a geared motor to which section 80 is connected.
  • the motor 106 is shown in dash-dotted lines in FIG. 2 above the end face of the section 80.
  • the slot 84 can be remotely adjusted to the desired angular position.
  • a rotary position transmitter e.g. a potentiometer, not shown, can be used, which outputs an angle-dependent voltage at the tap, which voltage is detected at a central control point.
  • the mixing ratio can be automatically set to, for example, a value specified by a programmable control unit.
  • the housing 72 of the mixing valve 38 or 40 is fastened on the disk 62 of the pump 46 or 48 in such a way that the cutout 82 is aligned with an inlet 108 in the disk 62.
  • the inlet 108 opens into a cylinder space 110 within the cylinder 112 formed by the disks 62, 64 and the casing 60, in which a piston 114 is slidably arranged.
  • the piston 114 contains two piston disks 116, 118 which are arranged at a distance from one another and are connected to one another via a central pin 120. Below the disc 118 there is a cylinder space 122 which can be connected via a bore 124 to a compressed air source 126 which also feeds the sprayers 14, 16.
  • a check valve 128 is located in the piston disc 118, via which the intermediate space 130 delimited by the piston discs 116, 118 can be connected to the cylinder space 122 if there is no overpressure in the cylinder space 122.
  • the cylinder space has an outlet opening 132 which is arranged in the disk 62 and into which a connecting piece 134 is screwed.
  • the outlet opening 132 has at its end facing the cylinder space 110 an annular projection 136 against which a cover 138 is pressed in a spring-loaded manner.
  • a spring 140 is supported on a shoulder in the connecting piece 134 and on the cover 138.
  • the lid 138 forms a check valve with a projection 136 and the spring 140.
  • the liquid provided with the additives in the highest required concentration passes from the containers 26 and 28 via the lines 30, 32 to the changeover valve 34, through which the container 26 or 28 is selected.
  • the setting of the changeover valve 34 defines the connection of the container 26 or 28 to the pipeline system 36, which is expediently provided with an outlet tap with which the liquid still present in the line system can be removed before switching to another container.
  • the liquid reaches the connecting pieces 68 of the mixing valves 38, 40 via the piping system 36.
  • Water enters from the container 44 via the piping system 42 into the connecting pieces 70 of the mixing valves 38, 40.
  • the valve plates 90, 92 are opened under the force of gravity of the liquid or water, so that the liquid and the water each reach the body 76 via the recesses 86 and 88.
  • the liquid and the water mix in the slot 84 and in the recess 82.
  • the mixture passes through the inlet 108 into the cylinder space 110, which fills with the liquid mixture, the mixing ratio of which depends on the angular position of the slot 84.
  • the angular positions of the slots 84 in the mixing valves 38, 40 differ.
  • Switching valves 142, 144 are located between the compressed air source 126 and the bores 124, which can be operated by hand or by a control.
  • the cylinder space 122 In the rest position of the piston 114, the cylinder space 122 is placed at atmospheric pressure via the changeover valves 142, 144.
  • the piston 114 bears against stops 146 designed as screws, which are screwed into the disk 64 and limit the stroke of the piston 114.
  • the maximum available volume of the cylinder space 110 for the liquid mixture and thus the amount of liquid intended for spraying are determined via the stroke path with the stops 146.
  • liquid which has entered the intermediate space 130 between the piston disk 116 and the jacket 60 can enter the cylinder space 122 via the check valve 128 and escape from there into the atmosphere.
  • the cylinder spaces 122 are each connected to the compressed air source 126 via the changeover valves 142, 144.
  • the piston 114 is moved upward when pressurized with compressed air. B. a working pressure of 0.7 MPa (7 bar) is generated.
  • the check valves in the mixing valves 38, 40 close under the pressure prevailing in the working space, so that no liquid is pumped back out of the cylinder space 110 into the containers 26, 28, 44.
  • the liquid leaves the cylinder space 110 via the outlet opening 132 and enters the pipes 50 and 52, which run to the sprayers 14, 16.
  • the cylinder chamber 122 is placed at atmospheric air pressure by the changeover valves 142, 144, which can be electromagnetically actuated control valves.
  • the check valve consisting of the elements 136, 138, 140 closes, as a result of which a return flow of liquid from the sprayers 14, 16 and the pipelines 50, 52 is prevented.
  • This check valve is set so that it closes when the pressure in the cylinder space 10 drops to 0.2 MPa (2 bar).
  • dripping on the spraying devices 14, 16 is advantageously prevented, so that there can be no undesirable influencing of the surface of the open mold 18, 20 by drops.
  • the pumps 46, 48 are arranged lower than the sprayers 14, 16.
  • the piston 114 which can be rotated in one piece, has a certain axial extent, so that a low pressure is sufficient to actuate the piston 114. If liquid gets into the intermediate space 130, this is removed via the check valve 128. This ensures that piston 114 operates smoothly and correctly. Since the cylinder 112 is operated at low pressure, the jacket 60 can be thin-walled.
  • the level control makes it possible to design the central containers 26, 28, 44 with a small volume.
  • a feed from the water supply network can also be carried out, with a pressure reducing valve being used to adapt the pressure to the pressure at the mixing valves 38, 40 which is dependent on the installation height of the containers 26, 28.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Nozzles (AREA)
  • Accessories For Mixers (AREA)
  • Details Or Accessories Of Spraying Plant Or Apparatus (AREA)
  • Casting Devices For Molds (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Detergent Compositions (AREA)

Abstract

PCT No. PCT/EP85/00666 Sec. 371 Date Jun. 6, 1986 Sec. 102(e) Date Jun. 6, 1986 PCT Filed Dec. 4, 1985 PCT Pub. No. WO86/03438 PCT Pub. Date Jun. 19, 1986.The subject matter of the invention is a device for supplying spray units for die casting machines each with a fluid containing water and additives for cooling, cleansing and lubricating purposes. The device contains at least one central tank (26,28) storing water comprising additives, whose concentration has been adjusted to a maximum. Said maximum value depends on casting materials, molds (18,20) and die casting methods which are carried out on the die casting machines (10,12). In another central tank (44) water is stored. The tanks (26,28,44) are connected to mixing valves (38,40) provided at each die casting machine (10,12). A pump is connected between the outlet of each mixing valve and the inlet of a respective spray unit at a die casting machine.

Description

Die Erfindung bezieht sich auf eine Vorrichtung zur Versorgung von Sprühgeräten für Druckgießmaschinen je mit einer Wasser und Zusätze enthaltenden Flüssigkeit zu Kühl-, Reinigungs- und/ oder Schmierzwecken, zum Aufbringen auf die Innenwand von geöffneten Gießformen, gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a device for supplying sprayers for die casting machines, each with a liquid containing water and additives for cooling, cleaning and / or lubricating purposes, for application to the inner wall of open molds, according to the preamble of claim 1.

Beim Druckgießverfahren wird die geöffnete Form vor dem Gießen innen mit einer Flüssigkeit benetzt, die Wasser und darin gelöste, suspendierte oder emulgierte Zusatzstoffe enthält. Die Flüssigkeit wird zum Trennen, Kühlen und/oder Schmieren verwendet. Die Zusammensetzung der Flüssigkeit richtet sich nach dem Material und der Gestalt der Gußstücke, inbesondere nach deren Wandstärke, sowie nach den Bedingungen für eine schnelle und einfache Entformung. Die Flüssigkeit wird mit Sprühgeräten den Wänden der Form zugeführt. Es ist bekannt, ein an einer Druckgießmaschine angeordnetes Sprühgerät an einen Behälter anzuschließen, aus dem die Flüssigkeit mittels Druckluft zu den Düsen des Sprühgeräts gefördert wird (Praxis der Druckgießfertigung von E. Brunhuber, 1980, Fachverlag Schiele und Schön GmbH, Seite 128).In the die-casting process, the opened mold is wetted on the inside with a liquid containing water and additives, dissolved, suspended or emulsified therein. The liquid is used for separation, cooling and / or lubrication. The composition of the liquid depends on the material and shape of the castings, in particular on their wall thickness, and on the conditions for quick and easy demolding. The liquid is sprayed onto the walls of the mold. It is known to connect a spray device arranged on a die casting machine to a container from which the liquid is conveyed by means of compressed air to the nozzles of the spray device (practice of die casting production by E. Brunhuber, 1980, Fachverlag Schiele and Schön GmbH, page 128).

Für unterschiedliche Gußformen werden häufig Flüssigkeiten mit unterschiedlicher Zusammensetzung sowie unterschiedliche, an die jeweilige Gießform angepaßte Sprühgeräte benötigt. Wenn bei einem Wechsel der Gießform der Flüssigkeitsvorrat im Behälter nicht erschöpft ist, muß der Behälter geleert und mit einer auf die andere Gießform abgestimmten Mischung gefüllt werden. Darüberhinaus kann es vorkommen, daß die Kapazität des Behälters für eine größere Serie der gleichen Gießform nicht ausreicht. Der Druckgußvorgang muß dann im Automatenbetrieb bei Erschöpfung des Flüssigkeitsvorrats im Behälter abgebrochen werden.Liquids with different compositions and different spraying devices adapted to the respective casting mold are often required for different casting molds. If the liquid supply in the container is not exhausted when the mold is changed, the container must be emptied and filled with a mixture which is matched to the other mold. In addition, the capacity of the container may not be sufficient for a larger series of the same mold. The die casting process must then be stopped in automatic mode when the liquid supply in the container is exhausted.

In der US-A-4,186,769 ist ein Verfahren beschrieben, bei dem einer verdünnten Flüssigkeit, während sie von einem ersten Behälter zu einer Gußmaschine oder in einen zweiten Behälter gepumpt wird, ein Konzentrat zugefügt wird in der Dosierung, daß eine Flüssigkeit der gewünschten Konzentration vorliegt, die den Gießmaschinen zugeführt wird, um dort in einem geschlossenen Kreislauf geführt zu werden.US-A-4,186,769 describes a process in which a concentrate is added to a dilute liquid as it is being pumped from a first container to a casting machine or into a second container in such a way that a liquid of the desired concentration is present which is fed to the casting machines in order to be conducted there in a closed circuit.

Der Erfindung liegt die Aufgabe zugrunde, eine für automatischen Betrieb geeignete Vorrichtung zur Versorgung eines oder mehrerer Sprühgeräte für Druckgießmaschinen je mit einer Wasser und Zusätze enthaltenden Flüssigkeit für Kühl-, Reinigungs- und/oder Schmierzwecke zu entwickeln.The invention has for its object to develop a suitable for automatic operation device for supplying one or more sprayers for die casting machines, each with a liquid containing water and additives for cooling, cleaning and / or lubricating purposes.

Die Aufgabe wird erfindungsgemäß durch die im Anspruch 1 beschriebenen Maßnahmen gelöst. Mit der im Anspruch 1 angegebenen Vorrichtung ist es möglich, das gewünschte Mischungsverhältnis mit dem Mischventil an der jeweiligen Druckgießmaschine einzustellen. Es wird dann immer nur die für den einzelnen Sprüharbeitsgang erforderliche Menge an speziell auf die jeweilige Gießform zugeschnittener Flüssigkeit erzeugt. Bei einem Wechsel der Gießform wird, falls ein neues Mischungsverhältnis benötigt wird, nur die Einstellung des Mischventils geändert. Die Einstellung kann in kurzer Zeit vorgenommen werden. Der Produktionsprozess wird daher nicht mehr durch zeitraubendes Nachfüllen oder Umfüllen der Flüssigkeit für den Sprüharbeitsgang beeinträchtigt. Die Druckgießmaschinen lassen sich mit der im Anspruch 1 beschriebenen Vorrichtung besser ausnutzen, da weniger Rüstzeiten anfallen. Das Prinzip der Erfindung besteht darin, Flüssigkeiten mit der höchsten notwendigen Konzentration zu speichern und für jeden Gießvorgang die erforderliche Verdünnung mit Wasser vor dem Sprühen vorzunehmen.The object is achieved by the measures described in claim 1. With the device specified in claim 1, it is possible to set the desired mixing ratio with the mixing valve on the respective die casting machine. In this case, only the amount of liquid specially tailored to the respective casting mold is required for the individual spraying operation. When changing the mold, if a new mixing ratio is required, only the setting of the mixing valve is changed. The setting can be made in a short time. The production process is therefore no longer affected by time-consuming refilling or decanting of the liquid for the spraying operation. The die casting machines can be better exploited with the device described in claim 1, since there are fewer set-up times. The principle of the invention is to store liquids with the highest necessary concentration and to carry out the required dilution with water for each casting process before spraying.

Bei einer bevorzugten Ausführungsform ist eine der Art der in den Druckgießmaschinen zu verarbeitenden Gießmaterialien entsprechende Zahl von zentralen Behältern vorgesehen, in denen jeweils Flüssigkeiten aus Wasser und Zusätzen in der höchsten für das jeweilige Gießmaterial bei einer entsprechenden Form benötigten Konzentration gespeichert sind, wobei die zentralen Behälter über Umschaltventile mit einem Rohrleitungssystem verbunden sind, an das die Mischventile geschlossen sind. Bei einem Wechsel in der Art des zu verarbeitenden Druckgießmaterials, z.B. beim Übergang von Aluminium auf Zinkdruckguß, auf einer oder mehreren zentral mit Sprühflüssigkeit versorgten Druckgießmaschinen, erfolgt die Umstellung auf die geeignete Sprühflüssigkeit durch die Öffnung des Ventils zwischen der Sammelleitung und dem für das jeweilige Material vorgesehenen zentralen Behälter sowie durch die Anpassung der Mischventileinstellung an das Material und die verwendete Gießform. Hinsichtlich der Sprühflüssigkeit ist ein Wechsel schnell und einfach durchführbar.In a preferred embodiment, a number of central containers is provided corresponding to the type of casting materials to be processed in the die casting machines, in which in each case liquids from water and additives are stored in the highest concentration required for the respective casting material in a corresponding shape, the central containers are connected via switching valves to a pipeline system to which the mixing valves are closed. When changing the type of die casting material to be processed, e.g. When changing from aluminum to die-cast zinc, on one or more die casting machines centrally supplied with spray liquid, the changeover to the suitable spray liquid takes place by opening the valve between the manifold and the central container provided for the respective material and by adapting the mixing valve setting to the material and the mold used. With regard to the spray liquid, a change can be carried out quickly and easily.

Vorzugsweise sind die zentralen Behälter höher als die Druckgießmaschinen angeordnet. Die Flüssigkeiten gelangen aus den Behältern somit unter dem Einfluß der Schwerkraft zu den Mischventilen. Es erübrigen sich deshalb aufwendige und energieverzehrende Fördermittel.The central containers are preferably arranged higher than the die casting machines. The liquids thus get from the containers to the mixing valves under the influence of gravity. This eliminates the need for complex and energy-consuming subsidies.

Es ist zweckmäßig, dem jeweiligen Mischventil eine Pumpe nachzuschalten, die das Sprühgerät für die Druckgießmaschine speist. Mit einer Pumpe läßt sich die Menge der zu versprühenden Flüssigkeit genau an den jeweiligen Bedarf anpassen. Hierdurch ergibt sich ein sparsamer Verbrauch an Sprühflüssigkeit.It is expedient to connect a pump downstream of the respective mixing valve, which feeds the spraying device for the die casting machine. With a pump, the amount of liquid to be sprayed can be adapted precisely to the respective requirement. This results in an economical consumption of spray liquid.

Eine weitere bevorzugte Ausführungsform besteht darin, daß die Fördereinrichtung als Kolbenpumpe ausgebildet ist, deren Zylinder entweder senkrecht steht oder jede beliebige andere Lage einnehmen kann, wenn sichergestellt ist, daß die Schwerkraft über die Medien die erforderliche Arbeit leistet. Bei dieser Ausführungsform wird für die Förderung und Mischung der jeweiligen Flüssigkeiten bis zur Füllung des Innenraums des Zylinders mit dem Gemisch keine Pumpe benötigt. Diese Vorgänge laufen unter dem Einfluß der Schwerkraft ab. Die Vorrichtung arbeitet deshalb besonders wirtschaftlich.Another preferred embodiment is that the delivery device is designed as a piston pump, the cylinder of which is either vertical or can assume any other position if it is ensured that gravity does the necessary work via the media. In this embodiment, no pump is required for the conveyance and mixing of the respective liquids until the interior of the cylinder is filled with the mixture. These processes take place under the influence of gravity. The device therefore works particularly economically.

Vorzugsweise weist der Kolben der jeweiligen Kolbenpumpe zwei in einem Abstand voneinander angeordnete Scheiben auf, von denen die eine dem für die Aufnahme der Flüssigkeit bestimmten Zylinderraum und die andere dem von einem Druckgas beaufschlagbaren Zylinderraum zugewandt ist, mit dem der von den beiden Scheiben begrenzte Zwischenraum über ein Rückschlagventil bei Aufhebung des Überdrucks verbindbar ist. Bei dieser Vorrichtung kann Flüssigkeit, die während des Auspumpens des mit Flüssigkeit gefüllten Zylinderraums in den Zwischenraum eindringt, nach Beendigung des Pumpvorgangs in den nicht mehr unter Gasdruck stehenden Zylinderraum gelangen und aus diesem entweichen. Mit dem aus zwei Scheiben bestehenden Kolben läßt sich auf einfache Weise das Problem der Abdichtung gegen die Flüssigkeit und gegen das Druckgas lösen.The piston of the respective piston pump preferably has two disks which are arranged at a distance from one another, one of which faces the cylinder space intended for holding the liquid and the other faces the cylinder space which can be acted upon by a compressed gas and with which the space delimited by the two disks over a check valve can be connected when the excess pressure is removed. In the case of this device, liquid which penetrates into the intermediate space during the pumping out of the cylinder chamber filled with liquid can get into the cylinder chamber which is no longer under gas pressure and can escape therefrom after the pumping process. With the piston consisting of two disks, the problem of sealing against the liquid and against the compressed gas can be easily solved.

Der mit Druckgas beaufschlagbare Zylinderraum ist zweckmäßigerweise über ein Umschaltventil mit der für das Sprühgerät vorgesehenen Druckluftquelle verbindbar. Für die Betätigung der Pumpe und des Sprühgeräts ist daher die gleiche Druckluftquelle verwendbar.The cylinder space to which pressurized gas can be applied can expediently be connected to the compressed air source provided for the sprayer via a changeover valve. The same source of compressed air can therefore be used to actuate the pump and the sprayer.

Bei einer vorteilhaften Ausführungsform ist am Ausgang des mit Flüssigkeit beaufschlagbaren Zylinderraums ein Rückschlagventil angeordnet. Die Pumpe läßt sich an einer geeigneten Stelle unterhalb des Sprühgeräts aufstellen. Das Rückschlagventil verhindert, daß vom Sprühgerät Flüssigkeit zur Pumpe zurückfließt bzw. daß das Sprühgerät Tropfen abgibt.In an advantageous embodiment, a check valve is arranged at the outlet of the cylinder chamber to which liquid can be applied. The pump can be installed at a suitable location below the sprayer. The check valve prevents liquid from flowing back from the sprayer to the pump or that the sprayer releases drops.

Eine bevorzugte Ausführungsform eines Mischventils besteht darin, daß ein in einem Gehäuse drehbar angeordneter zylindrischer Körper einen zentrischen nach einer Seite hin offenen Hohlraum und einen radialen Schlitz aufweist, der gegenüber zwei Einlaßöffnungen in einer Gehäusewand für die Flüssigkeit und für Wasser unter gegenläufiger Veränderung der Einlaßquerschnitte verdrehbar ist, wobei den Einlaßöffnungen Rückschlagventile vorgeschaltet sind. Die Rückschlagventile verhindern ein Zurückfließen der im Zylinder enthaltenen Flüssigkeit beim Auspumpen des Zylinders in die zentralen Behälter. Der zylindrische Körper kann mit einem Hebel versehen sein, dessen eines Ende als Anzeigespitze für eine Skala ausgebildet ist. Diese Ausführungsform ermöglicht die Einstellung des Mischungsverhältnisses von Hand. Es ist jedoch auch möglich, den zylindrischen Körper mit einem Motorantrieb zu versehen und die Winkelposition des zylindrischen Körpers über eine Positionsmeldeeinrichtung zu erfassen. Als Positionsmeldeeinrichtung eignet sich ein Potentiometer, das eine analoge Anzeige abgibt, oder eine Codierscheibe, mit der sich die Position digital erfassen läßt. Als Motorantrieb kann ein Getriebemotor verwendet werden.A preferred embodiment of a mixing valve consists in that a cylindrical body rotatably arranged in a housing has a central cavity which is open on one side and a radial slot which can be rotated in relation to two inlet openings in a housing wall for the liquid and for water, with the inlet cross-sections changing in opposite directions is, with check valves upstream of the inlet openings. The check valves prevent the liquid in the cylinder from flowing back when the cylinder is pumped out into the central container. The cylindrical body can be provided with a lever, one end of which is designed as a display tip for a scale. This embodiment enables the mixing ratio to be set by hand. However, it is also possible to provide the cylindrical body with a motor drive and to detect the angular position of the cylindrical body via a position indicator. A potentiometer, which gives an analog display, or a coding disk, with which the position can be recorded digitally, is suitable as the position reporting device. A geared motor can be used as the motor drive.

Der Zylinder der Pumpen ist vorzugsweise aus zwei Scheiben und einem zwischen den Scheiben angeordneten zylindrischen Mantel zusammengesetzt. Diese Ausführungsform ist wirtschaftlich herstellbar. Es reicht aus, wenn der zylindrische Mantel relativ dünnwandig ist. Im Zylinder können zur Begrenzung des Hubwegs des Kolbens Anschläge vorgesehen sein. Über eine Einstellung der Anschläge kann das Ansaugvolumen des Zylinders und damit die Menge der zu versprühenden Flüssigkeit vorgegeben werden.The cylinder of the pumps is preferably composed of two disks and a cylindrical jacket arranged between the disks. This embodiment can be produced economically. It is sufficient if the cylindrical jacket is relatively thin-walled. Stops can be provided in the cylinder to limit the stroke of the piston. The suction volume of the cylinder and thus the amount of liquid to be sprayed can be specified by adjusting the stops.

Weitere Einzelheiten, Merkmale und Vorteile der Erfindung ergeben sich aus der folgenden Beschreibung eines zeichnerisch dargestellten Ausführungsbeispiels.Further details, features and advantages of the invention result from the following description of an exemplary embodiment shown in the drawing.

Es zeigen:

  • Fig. 1 eine Vorrichtung zur Versorgung von Sprühgeräten für Druckgießmaschinen im Schema,
  • Fig. 2 eine perspektivische Ansicht eines Mischventils und einer Pumpe der in Fig. 1 dargestellten Vorrichtung.
  • Fig. 3 einen Längsschnitt durch die in Fig. 2 dargestellte Vorrichtung,
  • Fig. 4 einen Querschnitt längs der Linien 111-111 der in Fig. 3 dargestellten Vorrichtung.
Show it:
  • 1 shows a device for supplying sprayers for die casting machines in the diagram,
  • Fig. 2 is a perspective view of a mixing valve and a pump of the device shown in Fig. 1.
  • 3 shows a longitudinal section through the device shown in FIG. 2,
  • Fig. 4 is a cross section along lines 111-111 of the device shown in Fig. 3.

Druckgießmaschinen 10, 12, von denen in Fig. 1 zwei dargestellt sind, weisen jeweils Sprühgeräte 14,16 auf, mit denen die Oberflächen von Formen 18, 20 besprüht werden, die jeweils aus einer festen und einer verschiebbaren Formhälfte bestehen. Die beiden Hälften der Formen 18, 20 sind nicht näher bezeichnet. Die beiden Druckgießmaschinen 10, 12 weisen jeweils ein Maschinenbett und darauf angeordnete Ständer auf. An den Ständern sind die feststehenden Formhälften und Hydraulikelemente befestigt. Mit den Hydraulikelementen wird ein Schlitten und die an diesem befestigte bewegliche Formhälfte bei der Herstellung der Druckgußstücke verschoben. Das Maschinenbett, die Ständer und die Hydraulikelemente sind in Fig. 1 näher bezeichnet.Die casting machines 10, 12, two of which are shown in FIG. 1, each have spraying devices 14, 16 with which the surfaces of molds 18, 20 are sprayed, each of which consists of a fixed and a displaceable mold half. The two halves of the molds 18, 20 are not identified in more detail. The two die casting machines 10, 12 each have a machine bed and stands arranged thereon. The fixed mold halves and hydraulic elements are attached to the stands. A slide and the movable mold half attached to it are moved with the hydraulic elements during the production of the die castings. The machine bed, the stand and the hydraulic elements are designated in more detail in FIG. 1.

Mit den Sprühgeräten 14, 16 wird jeweils eine Flüssigkeit zu Kühl-, Reinigungs- und/oder Schmierzwecken auf die Formoberflächen versprüht. Die Sprühgeräte 14,16, die mit nicht näher bezeichneten, richtungsverstellbaren Sprühdüsen versehen sind, sind jeweils an Trägern 22, 24 horizontal und vertikal verschieb- und verschwenkbar befestigt. Die Träger 22, 24 sind je an einem der Maschinenständer angeordnet. Die zu versprühenden Flüssigkeiten bestehen aus Wasser mit Zusätzen, bei denen es sich um Graphit, Pigmente oder dergleichen in Verbindung mit speziellen Wirk- und Trägerstoffen handeln kann. Vielfach werden auch emulgierbare, pigmentfreie Zusätze verwendet.With the spray devices 14, 16, a liquid is sprayed onto the mold surfaces for cooling, cleaning and / or lubricating purposes. The spray devices 14, 16, which are provided with directionally adjustable spray nozzles, are each fastened to supports 22, 24 so as to be horizontally and vertically displaceable and pivotable. The carriers 22, 24 are each arranged on one of the machine stands. The liquids to be sprayed consist of water with additives, which can be graphite, pigments or the like in connection with special active substances and carriers. In many cases, emulsifiable, pigment-free additives are also used.

Für unterschiedliche Formen 18, 20 und unterschiedliche Gießmaterialien werden häufig unterschiedlich zusammengesetzte Flüssigkeiten benötigt. Auch die Sprühgeräte 14, 16 müssen oftmals unter Anpassung an eine andere Gießform ausgewechselt oder neu eingestellt werden.Liquids with different compositions are often required for different forms 18, 20 and different casting materials. The sprayers 14, 16 also often have to be replaced or readjusted to adapt to a different mold.

Zur Versorgung der Sprühgeräte 14, 16 mit Flüssigkeiten, deren Zusammensetzungen an die jeweiligen Bedingungen des auf der Druckgießmaschine 10, 12 durchgeführten Herstellungsverfahrens angepaßt sind, wird eine Vorrichtung verwendet, die mindestens einen für die Sprühgeräte 14, 16 zentralen Behälter 26 aufweist. Der Behälter 26 enthält Wasser mit den Zusätzen in der höchsten erforderlichen Konzentration. Die Konzentration ist auf diejenige Gießform und dasjenige Gießmaterial eingestellt, die für die Erzeugung einwandfreier Gußstücke den höchsten Anteil an Zusätzen benötigen. Die Zusätze können z. B. im Verhältnis 1:50 oder 1:80 mit Wasser verdünnt sein. Falls für verschiedene Gußmaterialien, z.B. Aluminium- oder Zinkdruckguß, unterschiedliche Zusätze benötigt werden, sind weitere zentrale Behälter mit Flüssigkeiten vorzusehen, in denen die entsprechenden Zusätze in der höchsten notwendigen Konzentration gelöst sind. In Fig. 1 ist nur ein weiterer zentraler Behälter 28 dargestellt. Bedarfsweise können mehrere zentrale Behälter vorgesehen sein.To supply the spray devices 14, 16 with liquids, the compositions of which are adapted to the respective conditions of the manufacturing process carried out on the die casting machine 10, 12, a device is used which has at least one central container 26 for the spray devices 14, 16. The container 26 contains water with the additives in the highest required concentration. The concentration is set to the mold and the casting material that require the highest proportion of additives for the production of perfect castings. The additives can e.g. B. be diluted 1:50 or 1:80 with water. If different additives are required for different casting materials, eg aluminum or zinc die casting, further central containers with liquids are to be provided in which the corresponding additives are dissolved in the highest necessary concentration. In Fig. 1 only a further central container 28 is shown. If necessary, several central containers can be provided.

Die zentralen Behälter 26, 28 sind ausgangsseitig über Rohrleitungen 30, 32 mit einem Umschaltventil 34 verbunden, dessen Ausgang an ein zentrales Rohrleitungssystem 36 angeschlossen ist, das nicht näher bezeichnete Abzweige enthält, die zu den Druckgießmaschinen 10, 12 und weiteren, nicht dargestellten Druckgießmaschinen verlaufen. An den Druckgießmaschinen 10, 12 und den weiteren Druckgießmaschinen befinden sich Mischventile 38, 40, die je mit einem Eingang an das Rohrleitungssystem 36 angeschlossen sind. Jeweils mit einem zweiten Eingang sind die Mischventile 38, 40 an ein -Rohrleitungssystem 42 angeschlossen, das von einem zentralen Behälter 44 gespeist wird, in dem sich Wasser befindet. Die zentralen Behälter 26, 28, 44 befinden sich in gleicher Höhe oberhalb der Druckgießmaschinen 10, 12. Daher gelangen das Wasser aus dem Behälter 44 und die jeweils über das Umschaltventil 34 ausgewählte Flüssigkeit unter den Einfluß der Schwerkraft und mit dem im wesentlichen gleichen Druck zu den Mischventilen 38, 40 an den Druckgießmaschinen 10, 12. In den einstellbar ausgebildeten Mischventilen 38, 40 wird die für den jeweiligen Herstellungsprozeß benötigte Konzentration der Zusätze im Wasser durch Beimengung von Wasser aus dem Behälter 44 erzeugt.The central containers 26, 28 are connected on the output side via pipes 30, 32 to a changeover valve 34, the outlet of which is connected to a central pipe system 36 which contains branches, not specified, which run to the die casting machines 10, 12 and further die casting machines, not shown . Mixing valves 38, 40 are located on the die casting machines 10, 12 and the other die casting machines, each of which is connected to the pipeline system 36 with an inlet. The mixing valves 38, 40 are each connected to a pipe system 42, which is fed by a central container 44, in which water is located, with a second input. The central containers 26, 28, 44 are located at the same height above the die casting machines 10, 12. Therefore, the water from the container 44 and the liquid selected in each case via the changeover valve 34 come in under the influence of gravity and with the essentially the same pressure the mixing valves 38, 40 on the die casting machines 10, 12. In the adjustable mixing valves 38, 40, the concentration of the additives in the water required for the respective manufacturing process is generated by admixing water from the container 44.

Den Mischventilen 38, 40 sind jeweils Pumpen 46, 48 nachgeschaltet, die beispielsweise in Höhe des Maschinenbetts der jeweiligen Druckgießmaschine 10, 12 angeordnet sind. Ausgangsseitig sind die Pumpen 46, 48 je über Rohrleitungen 50, 52 an die Sprühgeräte 14, 16 angeschlossen. Die Rohrleitungen 30, 32, das Umschaltventil 34, das Rohrleitungssystem 36, die Mischventile 38, 40, das Rohrleitungssystem 42, der Behälter 44 und die Pumpen 46,48 gehören ebenso wie die Behälter 26, 28 zu der Vorrichtung, mit der die Druckgießmaschinen 10, 12 zentral und automatisch je mit einer Wasser und Zusätze in einer an den Mischventilen 38, 40 einstellbaren Konzentration enthaltenden Flüssigkeit versorgt werden.The mixing valves 38, 40 are each followed by pumps 46, 48, which are arranged, for example, at the level of the machine bed of the respective die casting machine 10, 12. On the output side, pumps 46, 48 are each connected to sprayers 14, 16 via pipes 50, 52. The pipes 30, 32, the changeover valve 34, the pipe system 36, the mixing valves 38, 40, the pipe system 42, the container 44 and the pumps 46, 48, as well as the containers 26, 28, belong to the device with which the die casting machines 10 , 12 are supplied centrally and automatically each with water and additives in a liquid containing a concentration that can be set on the mixing valves 38, 40.

Der Behälter 44 ist mit einer Einrichtung 54 zur Regelung des Wasserstandes im Behälter 44 versehen. Sinkt der Wasserstand unter ein bestimmtes Niveau ab, dann wird dies von einem Füllstandsmeßwertgeber festgestellt, der zu der Einrichtung 54 gehört. Der Füllstandsmeßwertgeber öffnet einen Hahn in einer vom Wasserleitungssystem gespeisten Zuleitung für den Behälter 44, bis der gewünschte Füllstand erreicht ist.The container 44 is provided with a device 54 for regulating the water level in the container 44. If the water level drops below a certain level, this is determined by a fill level sensor which belongs to the device 54. The fill level sensor opens a tap in a feed line for the container 44 fed by the water supply system until the desired fill level is reached.

In den Behältern 26 und 28 sind ebenfalls Füllstandsmeßewertgeber 56 angeordnet, die Dosiergeräte 58 steuern. Die Dosiergeräte 58 erzeugen aus den Zusätzen und eingespeistem Wasser die für die Behälter 26, 28 bestimmten Flüssigkeiten.Fill level sensors 56, which control dosing devices 58, are also arranged in the containers 26 and 28. The dosing devices 58 generate the liquids intended for the containers 26, 28 from the additives and the water fed in.

Die Pumpen 46, 48, von denen eine in Fig. 2 perspektivisch dargestellt ist, weisen je einen zylindrischen Mantel 60 auf, der zwischen einer oberen Scheibe 62 und einer unteren Scheibe 64 unter Verwendung nicht näher bezeichneter Abdichtungen eingespannt ist. Die Scheiben 62, 64 sind rechteckig ausgebildet. An den vier Ecken sind die Schreiben 62, 64 über Stehbolzen 66 miteinander verbunden. Die Pumpen 46, 48 stehen mit ihren Zylindern an den Druckgießmaschinen 12, 10. Auf der oberen Scheibe 62 ist jeweils das Mischventil 38 bzw. 40 befestigt.The pumps 46, 48, one of which is shown in perspective in FIG. 2, each have a cylindrical jacket 60, which is clamped between an upper disk 62 and a lower disk 64 using seals, not specified. The disks 62, 64 are rectangular. At the four corners, the letters 62, 64 are connected to one another via stud bolts 66. The pumps 46, 48 stand with their cylinders on the die casting machines 12, 10. The mixing valve 38 or 40 is fastened to the upper disk 62.

Die Mischventile 38, 40 sind je mit einem Anschlußstutzen 68 für die von den Behältern 26 oder 28 angelieferte Flüssigkeit und mit einem Anschlußstutzen 70 für vom Behälter 44 geliefertes Wasser versehen. In einem zylindrischen Gehäuse 72 der Mischventile 38, 40 ist ein Lager 74 befestigt, in dem ein zylindrischer Körper 76 drehbar angeordnet ist. Der zylindrische Körper 76 besteht aus zwei Abschnitten 78, 80 mit unterschiedlich großen Durchmessern. Der Abschnitt 78 mit dem größeren Durchmesser weist eine zylindrische Aussparung 82 auf, die nach der der Pumpe 46,48 zugewandten Seite des Mischventils 38 bzw. 40 offen ist. Im Abschnitt 78 befindet sich ein über die gesamte Hälfte des Kreisrings der die Aussparung 82 umgebenden Wand verlaufender Schlitz 84. In Höhe des Schlitzes 84 befinden sich an diametral einander gegenüberliegenden Stellen des Gehäuses 72 und des Lagers 74 jeweils zylindrische Ausnehmungen 86, 88 für den Flüssigkeits- und Wassereinlaß. Die Ausnehmungen 86, 88 sind je mit den nicht näher bezeichneten Hohlräumen der Anschlußstutzen 68, 70 verbunden, die in das Gehäuse 72 eingeschraubt sind. In Abhängigkeit von der Winkelstellung des Schlitzes 84 gegenüber den Ausnehmungen 86, 88 läßt sich das Mischungsverhältnis zwischen der über den Anschlußstutzen 68 ankommenden Flüssigkeit und dem über den Anschlußstutzen 70 ankommenden Wasser verändern. Zwischen je einer Position des Schlitzes 84, in der entweder die Ausnehmung 86 bzw. 88 vollkommen geschlossen und die Ausnehmung 88 bzw. 86 gegen die Aussparung 82 hin offen ist, lassen sich mit anderen Positionen des Schlitzes 84 unterschiedliche Öffnungsquerschnitte erreichen, die das jeweilige Mischungsverhältnis bestimmen.The mixing valves 38, 40 are each provided with a connecting piece 68 for the liquid supplied by the containers 26 or 28 and with a connecting piece 70 for the water supplied by the container 44. A bearing 74 is fixed in a cylindrical housing 72 of the mixing valves 38, 40, in which a cylindrical body 76 is rotatably arranged. The cylindrical body 76 consists of two sections 78, 80 with different diameters. The section 78 with the larger diameter has a cylindrical recess 82 which is open on the side of the mixing valve 38 or 40 facing the pump 46, 48. In section 78 there is a slot 84 running over the entire half of the circular ring of the wall surrounding the recess 82. At the height of the slot 84 there are cylindrical recesses 86, 88 for the liquid at diametrically opposite locations of the housing 72 and the bearing 74 - and water inlet. The recesses 86, 88 are each connected to the cavities of the connecting pieces 68, 70, which are unspecified, and which are screwed into the housing 72. Depending on the angular position of the slot 84 with respect to the recesses 86, 88, the mixing ratio between the liquid arriving via the connecting piece 68 and the water arriving via the connecting piece 70 can be changed. Between each position of the slot 84, in which either the recess 86 or 88 is completely closed and the recess 88 or 86 is open towards the recess 82, different opening cross-sections can be achieved with other positions of the slot 84, which cross-section the respective mixing ratio determine.

Die im Innern des Gehäuses 72 liegenden, nicht näher bezeichneten Stirnseiten der Anschlußstutzen 68, 70 sind je als Ventilsitze für Ventilteller 90, 92 ausgebildet, die unter Federvorspannung gegen die Ventilsitze gedrückt werden. Die Ventilteller 90, 92, die Ventilsitze und die nicht näher bezeichneten Federn, deren Enden sich an den Ventiltellern 90, 92 und an Federringen 94 in den Ausnehmungen 86, 88 abstützen, stellen Rückschlagventile dar.The end faces of the connecting pieces 68, 70, which are located in the interior of the housing 72 and are not designated in any more detail, are each designed as valve seats for valve plates 90, 92, which are pressed against the valve seats under spring preload. The valve plates 90, 92, the valve seats and the unspecified springs, the ends of which are located on the valve plates 90, 92 and on the spring washers 94 in the Support recesses 86, 88 represent check valves.

Das Gehäuse 72 ist auf seiner, der Pumpe 46 bzw. 48 abgewandten Seite mit einem plattenförmigen Deckel 96 verschlossen, der eine nicht näher bezeichnete Öffnung aufweist, durch die der Abschnitt 80 des Körpers 76 nach außen ragt. In eine ungefähr radial im Abschnitt 80 verlaufende Bohrung ist ein Hebel 98 eingesteckt und dann angeschraubt. Der Hebel 98 ragt beidseitig aus dem Abschnitt 80 heraus. An einem Ende des Hebels 98 befindet sich ein Knauf 100, während das andere Ende des Hebels 98 als Zeiger 102 ausgebildet ist, der oberhalb einer Skala 104 drehbar ist, an der das Mischungsverhältnis ablesbar ist. Über den Hebel 98 läßt sich von Hand die Winkelposition des Schlitzes 84 in Übereinstimmung mit einem gewünschten Mischungsverhältnis bringen.The housing 72 is closed on its side facing away from the pump 46 or 48 with a plate-shaped cover 96 which has an opening (not specified in more detail) through which the section 80 of the body 76 projects outwards. A lever 98 is inserted into an approximately radial bore in section 80 and then screwed on. The lever 98 protrudes from the section 80 on both sides. At one end of the lever 98 there is a knob 100, while the other end of the lever 98 is designed as a pointer 102 which can be rotated above a scale 104 on which the mixing ratio can be read. The angular position of the slot 84 can be brought into accordance with a desired mixing ratio by means of the lever 98.

Anstelle des Hebels 98 oder zusätzlich zu dem Hebel 98 kann die Welle eines Motors 106, z.B. eines Getriebemotors, mit dem Abschnitt 80 verbunden werden. Der Motor 106 ist in Fig. 2 strichpunktiert oberhalb der Stirnseite des Abschnitts 80 dargestellt. Mit dem Motor 106 kann der Schlitz 84 ferngesteuert auf die gewünschte Winkelposition eingestellt werden. Zur Meldung der Winkellage des Schlitzes 84 kann ein Drehstellungsgeber, z.B. ein nicht dargestelltes Potentiometer, verwendet werden, das am Abgriff eine winkelstellungsabhängige Spannung abgibt, die an einer zentralen Steuerstelle erfaßt wird. Mit dem Drehstellungsgeber, dessen Ausgangssignal zentral erfaßt wird, und mit dem Motor 106, der zentral mit einer Steuerspannung versorgt wird, läßt sich eine selbsttätige Einstellung des Mischungsverhältnisses auf beispielsweise durch ein programmierbares Steuergerät vorgegebene Wert erreichen.Instead of lever 98 or in addition to lever 98, the shaft of a motor 106, e.g. a geared motor to which section 80 is connected. The motor 106 is shown in dash-dotted lines in FIG. 2 above the end face of the section 80. With the motor 106, the slot 84 can be remotely adjusted to the desired angular position. To report the angular position of the slot 84, a rotary position transmitter, e.g. a potentiometer, not shown, can be used, which outputs an angle-dependent voltage at the tap, which voltage is detected at a central control point. With the rotary position transmitter, the output signal of which is recorded centrally, and with the motor 106, which is supplied centrally with a control voltage, the mixing ratio can be automatically set to, for example, a value specified by a programmable control unit.

Das Gehäuse 72 des Mischventils 38 bzw. 40 ist auf der Scheibe 62 der Pumpe 46 bzw. 48 derart befestigt, daß die Aussparung 82 mit einem Einlaß 108 in der Scheibe 62 fluchtet. Der Einlaß 108 mündet in einen Zylinderraum 110 innerhalb des von den Scheiben 62, 64 und dem Mantel 60 gebildeten Zylinders 112, in dem ein Kolben 114 verschiebbar angeordnet ist. Der Kolben 114 enthält zwei im Abstand voneinander angeordnete Kolbenscheiben 116, 118, die über einen zentrischen Zapfen 120 miteinander verbunden sind. Unterhalb der Scheibe 118 befindet sich ein Zylinderraum 122, der über eine Bohrung 124 mit einer Druckluftquelle 126 verbindbar ist, die auch die Sprühgeräte 14, 16 speist. In der Kolbenscheibe 118 befindet sich ein Rückschlagventil 128, über das der von den Kolbenscheiben 116, 118 begrenzte Zwischenraum 130 mit dem Zylinderraum 122 verbindbar ist, wenn im Zylinderraum 122 kein Überdruck herrscht.The housing 72 of the mixing valve 38 or 40 is fastened on the disk 62 of the pump 46 or 48 in such a way that the cutout 82 is aligned with an inlet 108 in the disk 62. The inlet 108 opens into a cylinder space 110 within the cylinder 112 formed by the disks 62, 64 and the casing 60, in which a piston 114 is slidably arranged. The piston 114 contains two piston disks 116, 118 which are arranged at a distance from one another and are connected to one another via a central pin 120. Below the disc 118 there is a cylinder space 122 which can be connected via a bore 124 to a compressed air source 126 which also feeds the sprayers 14, 16. A check valve 128 is located in the piston disc 118, via which the intermediate space 130 delimited by the piston discs 116, 118 can be connected to the cylinder space 122 if there is no overpressure in the cylinder space 122.

Der Zylinderraum weist eine in der Scheibe 62 angeordnete Auslaßöffnung 132 auf, in die ein Anschlußstutzen 134 eingeschraubt ist. Die Auslaßöffnung 132 hat an ihrem, dem Zylinderraum 110 zugewandten Ende einen ringförmigen Vorsprung 136, gegen den ein Deckel 138 unter Federvorspannung dichtend angedrückt wird. Eine Feder 140 stützt sich an einem Absatz im Anschlußstutzen 134 und am Deckel 138 ab. Der Deckel 138 bildet mit einem Vorsprung 136 und der Feder 140 ein Rückschlagventil.The cylinder space has an outlet opening 132 which is arranged in the disk 62 and into which a connecting piece 134 is screwed. The outlet opening 132 has at its end facing the cylinder space 110 an annular projection 136 against which a cover 138 is pressed in a spring-loaded manner. A spring 140 is supported on a shoulder in the connecting piece 134 and on the cover 138. The lid 138 forms a check valve with a projection 136 and the spring 140.

Die mit den Zusätzen in der höchsten benötigten Konzentration versehene Flüssigkeit gelangt aus den Behältern 26 und 28 über die Leitungen 30, 32 zum Umschaltventil 34, durch das eine Auswahl des Behälters 26 oder 28 vorgenommen wird. Die Einstellung des Umschaltventils 34 legt die Verbindung des Behälters 26 oder 28 zum Rohrleitungssystem 36 fest, das zweckmäßigerweise mit einem Auslaßhahn versehen ist, mit dem vor einer Umschaltung auf einen anderen Behälter die noch im Leitungssystem vorhandene Flüssigkeit entfernt werden kann. Über das Rohrleitungssystem 36 gelangt die Flüssigkeit zu den Anschlußstutzen 68 der Mischventile 38, 40. Wasser tritt aus dem Behälter 44 über das Rohrleitungssystem 42 in die Anschlußstutzen 70 der Mischventile 38, 40 ein. Unter der Schwerkraftwirkung der Flüssigkeit bzw. des Wassers werden die Ventilteller 90, 92 geöffnet, so daß die Flüssigkeit und das Wasser jeweils über die Ausnehmungen 86 und 88 zum Körper 76 gelangen. Über den von der Winkelstellung des Schlitzes 84 abhängigen freien Querschnitt an der Mündung der Ausnehmung 86 bzw. 88 tritt jeweils Flüssigkeit und Wasser in den Schlitz 84 ein. Die Flüssigkeit und das Wasser vermischen sich im Schlitz 84 und in der Aussparung 82. Das Gemisch gelangt über den Einlaß 108 in den Zylinderraum 110, der sich mit dem Flüssigkeitsgemisch füllt, dessen Mischungsverhältnis von der Winkelstellung des Schlitzes 84 abhängt. Je nach dem Herstellungsprogramm, für das die Druckgießmaschinen 10, 12 eingerichtet sind, unterscheiden sich die Winkelstellungen der Schlitze 84 in den Mischventilen 38, 40.The liquid provided with the additives in the highest required concentration passes from the containers 26 and 28 via the lines 30, 32 to the changeover valve 34, through which the container 26 or 28 is selected. The setting of the changeover valve 34 defines the connection of the container 26 or 28 to the pipeline system 36, which is expediently provided with an outlet tap with which the liquid still present in the line system can be removed before switching to another container. The liquid reaches the connecting pieces 68 of the mixing valves 38, 40 via the piping system 36. Water enters from the container 44 via the piping system 42 into the connecting pieces 70 of the mixing valves 38, 40. The valve plates 90, 92 are opened under the force of gravity of the liquid or water, so that the liquid and the water each reach the body 76 via the recesses 86 and 88. Liquid and water enter the slot 84 via the free cross-section at the mouth of the recess 86 or 88, which is dependent on the angular position of the slot 84. The liquid and the water mix in the slot 84 and in the recess 82. The mixture passes through the inlet 108 into the cylinder space 110, which fills with the liquid mixture, the mixing ratio of which depends on the angular position of the slot 84. Depending on the production program for which the die casting machines 10, 12 are set up, the angular positions of the slots 84 in the mixing valves 38, 40 differ.

Zwischen der Druckluftquelle 126 und den Bohrungen 124 befinden sich jeweils Umschaltventile 142, 144, die von Hand oder über eine Steuerung betätigbar sind. In Ruhestellung des Kolbens 114 ist der Zylinderraum 122 über die Umschaltventile 142,144 an Atmosphärendruck gelegt. Der Kolben 114 liegt dabei an als Schrauben ausgebildeten Anschlägen 146 an, die in die Scheibe 64 eingeschraubt sind und den Hubweg des Kolbens 114 begrenzen. Über den Hubweg wird mit den Anschlägen 146 das für das Flüssigkeitsgemisch maximal verfügbare Volumen des Zylinderraums 110 und damit die für das Versprühen vorgesehene Flüssigkeitsmenge festgelegt.Switching valves 142, 144 are located between the compressed air source 126 and the bores 124, which can be operated by hand or by a control. In the rest position of the piston 114, the cylinder space 122 is placed at atmospheric pressure via the changeover valves 142, 144. The piston 114 bears against stops 146 designed as screws, which are screwed into the disk 64 and limit the stroke of the piston 114. The maximum available volume of the cylinder space 110 for the liquid mixture and thus the amount of liquid intended for spraying are determined via the stroke path with the stops 146.

Wenn der Zylinderraum 122 unter atmosphärischem Luftdruck steht, dann kann Flüssigkeit, die zwischen der Kolbenscheibe 116 und dem Mantel 60 in den Zwischenraum 130 eingedrungen ist, über das Rückschlagventil 128 in den Zylinderraum 122 gelangen und von dort in die Atmosphäre entweichen.If the cylinder space 122 is under atmospheric air pressure, then liquid which has entered the intermediate space 130 between the piston disk 116 and the jacket 60 can enter the cylinder space 122 via the check valve 128 and escape from there into the atmosphere.

Wenn auf die Formen 18, 20 Flüssigkeit versprüht werden soll, werden die Zylinderräume 122 jeweils über die Umschaltventile 142, 144 an die Druckluftquelle 126 angeschlossen. Zugleich werden die Sprühgeräte 14, 16 von der Druckluftquelle 126 mit Druckluft versorgt. Der Kolben 114 wird bei Beaufschlagung mit Druckluft nach oben bewegt, wobei im Zylinderraum 110 z. B. ein Arbeitsdruck von 0,7 MPa (7 bar) erzeugt wird. Unter dem im Arbeitsraum herrschenden Druck schließen sich die Rückschlagventile in den Mischventilen 38, 40, so daß keine Flüssigkeit aus dem Zylinderraum 110 in die Behälter 26, 28, 44 zurückgepumpt wird. Die Flüssigkeit verläßt den Zylinderraum 110 jeweils über die Auslaßöffnung 132 und gelangt in die Rohrleitungen 50 bzw. 52, die zu den Sprühgeräten 14, 16 verlaufen.If liquid is to be sprayed onto the molds 18, 20, the cylinder spaces 122 are each connected to the compressed air source 126 via the changeover valves 142, 144. At the same time the sprayers 14, 16 from the compressed air source le 126 supplied with compressed air. The piston 114 is moved upward when pressurized with compressed air. B. a working pressure of 0.7 MPa (7 bar) is generated. The check valves in the mixing valves 38, 40 close under the pressure prevailing in the working space, so that no liquid is pumped back out of the cylinder space 110 into the containers 26, 28, 44. The liquid leaves the cylinder space 110 via the outlet opening 132 and enters the pipes 50 and 52, which run to the sprayers 14, 16.

Wenn der Kolben 114 die Flüssigkeit aus dem Zylinder 112 verdrängt hat, wird der Zylinderraum 122 jeweils durch die Umschaltventile 142, 144, bei denen es sich um elektromagnetisch betätigbare Steuerventile handeln kann, an atmosphärischen Luftdruck gelegt. Mit der Druckentlastung des Kolbens 114 schließt sich das aus den Elementen 136, 138, 140 bestehende Rückschlagventil, wodurch ein Rücklauf von Flüssigkeit aus den Sprühgeräten 14, 16 und den Rohrleitungen 50, 52 verhindert wird. Dieses Rückschlagventil ist so eingestellt, daß es bereits bei einem Abfall des Drucks im Zylinderraum 10 auf 0,2 MPa (2 bar) schließt. Zugleich wird damit in vorteilhafter Weise ein Nachtropfen an den Sprühgeräten 14, 16 verhindert, so daß keine unerwünschte Beeinflu- ßung der Oberfläche der jeweils offenen Form 18, 20 durch Tropfen vorkommen kann. Die Pumpen 46, 48 sind tiefer als die Sprühgeräte 14, 16 angeordnet.When the piston 114 has displaced the liquid from the cylinder 112, the cylinder chamber 122 is placed at atmospheric air pressure by the changeover valves 142, 144, which can be electromagnetically actuated control valves. With the pressure relief of the piston 114, the check valve consisting of the elements 136, 138, 140 closes, as a result of which a return flow of liquid from the sprayers 14, 16 and the pipelines 50, 52 is prevented. This check valve is set so that it closes when the pressure in the cylinder space 10 drops to 0.2 MPa (2 bar). At the same time, dripping on the spraying devices 14, 16 is advantageously prevented, so that there can be no undesirable influencing of the surface of the open mold 18, 20 by drops. The pumps 46, 48 are arranged lower than the sprayers 14, 16.

Der Kolben 114, der aus einem Stück gedreht sein kann, hat eine gewisse axiale Ausdehnung, so daß ein niedriger Druck zur Betätigung des Kolbens 114 ausreicht. Falls Flüssigkeit in den Zwischenraum 130 gelangt, wird diese über das Rückschlagventil 128 beseitigt. Damit ist eine gleichmäßige, einwandfreie Arbeitsweise des Kolbens 114 gewährleistet. Da im Zylinder 112 mit niedrigem Druck gearbeitet wird, kann der Mantel 60 dünnwandig ausgebildet sein.The piston 114, which can be rotated in one piece, has a certain axial extent, so that a low pressure is sufficient to actuate the piston 114. If liquid gets into the intermediate space 130, this is removed via the check valve 128. This ensures that piston 114 operates smoothly and correctly. Since the cylinder 112 is operated at low pressure, the jacket 60 can be thin-walled.

Durch die Füllstandsregelung ist es möglich, die zentralen Behälter 26, 28, 44 mit kleinem Volumen auszubilden. Anstelle des Behälters 44 mit Füllstandsregelung kann auch eine Einspeisung aus dem Wasserleitungsnetz vorgenommen werden, wobei mit einem Druckminderungsventil eine Anpassung des Drucks an den von der Aufstellungshöhe der Behälter 26,28 abhängigen Druck an den Mischventilen 38, 40 vorgenommen wird.The level control makes it possible to design the central containers 26, 28, 44 with a small volume. Instead of the container 44 with level control, a feed from the water supply network can also be carried out, with a pressure reducing valve being used to adapt the pressure to the pressure at the mixing valves 38, 40 which is dependent on the installation height of the containers 26, 28.

Claims (15)

1. A device for supplying a plurality of spray units (14, 16), each for a die casting machine (10, 12), with a fluid containing water and additives for application on the inner walls of the open molds (18,20) having at least one central tank (26, 28) for storing water containing additives, a further central tank (44) for storing water; piping systems (36, 42) which connect these tanks (26, 28, 44) and which have supplying means (46, 48) characterized in that the concentration of water and the additives in the tank (26, 28) is the maximum necessary for certain casting materials, molds (18, 20), and die casting processes and that the tanks (26, 28, 44) are each connected via the piping systems (36, 42) with the mixing valves (38, 40) provided for the die casting machines and that supplying means (46, 48) are subsequented to said mixing valves which are connected with the spray units (14,16) via pipings (50, 52).
2. The device of claim 1, characterized in that a number of first central tanks (26, 28) which corresponds to the types of the casting materials to be processed in the die casting machines (10,12), are provided, wherein fluids composed of water and additives are stored in the maximum concentration necessary for a corresponding mold (18, 20), and that the central tanks (26, 28) are connected via reversing valves (34) with a piping system (36) with which the mixing valves (38, 40) are connected.
3. The device according to one of the preceding claims, characterized in that the central tanks (26, 28, 44) are arranged at the same height level.
4. The device according to one of the preceding claims, characterized in that the supplying means (46, 48) are formed as plunger pumps whose cylinders (112) are in a vertical or horizontal position.
5. The device according to claim 4, characterized in that the plunger (114) of the corresponding plunger pump has two spaced disks (116, 118), one of which faces the cylinder volume (110) for taking in the fluid and the other faces the cylinder volume (122) attackable by the pressurized gas, with which the interspace (132) formed between to two disks (116, 118) can be connected via a check valve (128) when the high pressure is relieved.
6. The device according to claim 5, characterized in that the cylinder volume (122) attackable by pressurized gas can be connected with the source (126) of pressurized air provided for each spray unit (14, 16) via reversing valve (142, 144).
7. The device according to claim 6, characterized in that a check valve (136,138,140) is arranged at the outlet of the cylinder volume (110) containing fluid.
8. The device according to one of the preceding claims, characterized in that a cylindrical body (76) rotatably mounted in a housing (72) of the mixing valve (38, 40) has a centric cavity (82) which is open towards one side and a radial slot (84) which may be turned around as against two inlet openings in a housing wall for the fluid and for water by countercurrent change of the inlet cross-sections, check valves being introduced before the inlet openings.
9. The device according to claim 8, characterized in that said cylindrical body (76) has a section (80) projecting from housing (72), a lever (98) being affixed to said section.
10. The device according to claim 9, characterized in that the section (80) of the cylindrical body (76) of the mixing valve (38, 40) which projects from said housing (72) is connected with a motor (106).
11. The device according to claim 10, characterized in that an angle potentiometer is connected with the section (80) projecting from the housing (72).
12. The device according to claim 11, characterized in that the cylinder (112) of the corresponding supplying means (46, 48) is composed of two disks (62, 64) and a cylindrical jacket (60) arranged between the disks (62, 64).
13. The device according to claim 12, characterized in that the cylinder (112) includes stops (146) which control the length of movement of the plunger (114).
14. The device according to one of the preceding claims, characterized in that the central tanks (26, 28, 44) include fluid level controllers.
15. The device according to one of the preced- ina claims. characterized in that the cvlinder volume (112) has in a communication therewith a valve (142, 144) for ventilation to the atmosphere.
EP86900103A 1984-12-04 1985-12-04 Device for providing individual spray systems of pressure casting machines with a liquid containing water and additives Expired EP0203980B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86900103T ATE43267T1 (en) 1984-12-04 1985-12-04 DEVICE FOR SUPPLYING SPRAYING DEVICES FOR DIE CASTING MACHINES EACH WITH A LIQUID CONTAINING WATER AND ADDITIVES.

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DE19843444182 DE3444182A1 (en) 1984-12-04 1984-12-04 DEVICE FOR SUPPLYING SPRAYERS FOR DIE CASTING MACHINES EVERY LIQUID CONTAINING WATER AND ADDITIVES
DE3444182 1984-12-04

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EP0203980A1 EP0203980A1 (en) 1986-12-10
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JP (1) JP2608057B2 (en)
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JP6086895B2 (en) * 2014-12-12 2017-03-01 ジヤトコ株式会社 Mold cooling system
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IT201800006906A1 (en) * 2018-07-04 2020-01-04 PROCEDURE AND SYSTEM FOR DOSING A DILUTED
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ATE43267T1 (en) 1989-06-15
KR870700031A (en) 1987-02-28
DE3444182C2 (en) 1987-10-22
EP0203980A1 (en) 1986-12-10
WO1986003438A1 (en) 1986-06-19
AU5230386A (en) 1986-07-01
DE3444182A1 (en) 1986-06-12
US4721150A (en) 1988-01-26
JP2608057B2 (en) 1997-05-07
JPS62501276A (en) 1987-05-21
DE3570380D1 (en) 1989-06-29

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