DE1454975B1

DE1454975B1 - Apparatus for producing a hollow plastic article in a hollow multi-part mold by rotational molding

Info

Publication number: DE1454975B1
Application number: DE1964B0079258
Authority: DE
Inventors: Russell-French Harry M; Eggert Jun Walter S
Original assignee: Budd Co
Current assignee: ThyssenKrupp Budd Co
Priority date: 1963-11-08
Filing date: 1964-11-09
Publication date: 1971-02-25
Also published as: US3237247A

Description

Die Erfindung bezieht sich auf eine Vorrichtung zum Herstellen eines hohlen Kunststoffgegenstandes in einer hohlen mehrteiligen Form durch Rotationsgießen, wobei die Drehachse der Form gegenüber der Senkrechten geneigt ist, mit einem eine Heizkammer und eine zu dieser führenden Öffnung aufweisenden Ofen, mit einer Anordnung zur drehbaren Lagerung eines Formträgers, mit einem zum Antrieb des Formträgers dienenden Motor und mit einem die Anordnung mit Motor und Formträger tragenden Wagen zum Ein- und Ausfahren des Formträgers in den Ofen.The invention relates to an apparatus for manufacturing a hollow plastic article in a hollow multi-part mold by rotational molding with the axis of rotation facing the mold the vertical is inclined, with a heating chamber and an opening leading to this having Oven, with an arrangement for the rotatable mounting of a mold carrier, with a drive of the mold carrier serving motor and with a supporting the arrangement with the motor and mold carrier Trolley for moving the mold carrier in and out of the furnace.

Bei einer derartigen Vorrichtung besteht die Erfindung darin, daß die Drehachse des Formträgers senkrecht auf der Drehachse der Form steht und daß die Form über rechtwinklig zueinander angeordnete Querarme mit dem Formträger verbunden ist.In such a device, the invention consists in that the axis of rotation of the mold carrier is perpendicular to the axis of rotation of the form and that the form is arranged at right angles to each other Cross arms is connected to the mold carrier.

Bei einer bekannten Vorrichtung zum Herstellen von hohlen Gegenständen aus Kunststoff durch Rotationsgießen ist die Drehachse der Form gegenüber der Senkrechten geneigt, was den Vorteil hat, daß sich der Werkstoff verhältnismäßig gleichförmig im Inneren der Form als Schicht ablagert. Damit diese Schicht erstarrt, wird die rotierende Form in einen beheizten Ofen eingefahren. Zum Ein- und Ausfahren der Form in bzw. aus dem Ofen dient ein Wagen, auf dem die Form mit Formträger und Antriebsmotor montiert ist.In a known device for producing hollow objects made of plastic by Rotational casting, the axis of rotation of the mold is inclined to the vertical, which has the advantage of that the material is deposited relatively uniformly in the interior of the mold as a layer. In order to this layer solidifies, the rotating mold is moved into a heated oven. For one and A carriage is used to move the mold into or out of the furnace, on which the mold with mold carrier and Drive motor is mounted.

Gegenüber den bekannten Vorrichtungen ergibt sich mit dem Gegenstand der Erfindung der Vorteil einfacherer Getriebe innerhalb des Ofens. Bei der erfindungsgemäßen Ausbildung sind nur zueinander parallel oder rechtwinklig angeordnete Wellen anzutreiben, bei der vorbekannten Ausbildung verläuft die waagerechte Hauptwelle im spitzen Winkel zu der die Form tragenden Welle, so daß ein Riemenantrieb mit Umlenkrollen vorgesehen ist. Die bekannte Ausbildung ist also verwickelter und teurer, und die Riemen sind nicht für höhere Temperaturen geeignet. Mit der vorliegenden Erfindung soll die Aufgabe gelöst werden, bei einer Schleudergießmaschine zum Herstellen von Gegenständen mit gleichmäßiger Wandstärke den Antrieb der Schleudergußform zu vereinfachen.Compared to the known devices, the object of the invention has the advantage simpler gear inside the furnace. In the training according to the invention are only to each other Drive parallel or right-angled shafts, runs in the known training the horizontal main shaft at an acute angle to the shaft carrying the mold, so that a belt drive is provided with pulleys. So the familiar training is more involved and expensive, and the Belts are not suitable for higher temperatures. With the present invention the object be solved, in a centrifugal casting machine for making objects with more uniform Wall thickness to simplify the drive of the centrifugal casting mold.

Die Erfindung wird an Hand eines Ausführungsbeispieles näher erläuert. In der Zeichnung zeigt The invention is explained in more detail using an exemplary embodiment. In the drawing shows

F i g. 1 eine perspektivische Ansicht einer Schleudergußvorrichtung gemäß der Erfindung,F i g. 1 is a perspective view of a centrifugal casting apparatus according to the invention,

F i g. 2 eine teilweise Vertikalschnittansicht, im wesentlichen längs der Linie 2-2 der F i g. 3, die das Innere des Ofenvorderteils wiedergibt undF i g. 2 is a partial vertical sectional view taken substantially along line 2-2 of FIG. 3 that this Reproduces the interior of the front part of the furnace and

F i g. 3 im vergrößerten Maßstab, eine teilweise Längsschnittansicht, im wesentlichen längs der Linie 3-3 der F i g. 2, wobei Teile weggelassen sind.F i g. Figure 3, on an enlarged scale, is a partial longitudinal sectional view taken substantially along the line 3-3 of FIG. 2, with parts omitted.

Wie aus der Zeichnung ersichtlich ist, umfaßt die Schleudergußvorrichtung eine hohle, aus einzelnen Teilen bestehende Form 10, eine Schleudergußmaschine 11 und einen Ofen 12. Die Ausbildung der Form 10 und die Art und Weise ihrer Montierung und ihres Drehungsantriebs hängt selbstverständlich von der Ausbildung des zu gießenden Gegenstandes ab. Zwecks Vereinfachung der Zeichnung ist die Form 10 als eine zylindrische Form dargestellt, die aus zwei lösbaren Teilen mit einer in Längsrichtung verlaufenden Trennlinie besteht. Eine derartige Form dient zur Fertigung eines Hohlzylinders.As can be seen from the drawing, the centrifugal casting device comprises a hollow, individual one Share existing mold 10, a centrifugal casting machine 11 and an oven 12. The formation of the Form 10 and how it is mounted and rotated, of course, depends from the formation of the object to be cast. In order to simplify the drawing, the Form 10 shown as a cylindrical shape made up of two detachable parts with one in the longitudinal direction running dividing line. Such a shape is used to manufacture a hollow cylinder.

Die Aufgabe der Schleudergußmaschine 11 besteht darin, die Form 10 abzustützen und um eine Vielzahl von untereinander senkrecht verlaufenden, sich im Forminnern schneidenden Achsen rotieren zu lassen. Dafür umfaßt die Maschine 11 einen Formträger 13, der auf einen Wagen 14 aufgebracht ist, welcher eine Vielzahl von Rädern 15 umfaßt, letztere laufen auf Führungsschienen 16, die vor dem Ofen 12 und senkrecht auf diesen zu angeordnet sind. Der Wagen 14 umfaßt weiterhin eine Basisplatte 17, an der außer den Rädern 15 ein vertikaler Träger 18 befestigt ist,The task of the centrifugal casting machine 11 is to support the mold 10 and around a plurality to be rotated by mutually perpendicular axes that intersect inside the mold. For this purpose, the machine 11 comprises a mold carrier 13 which is applied to a carriage 14, which one A plurality of wheels 15 includes, the latter run on guide rails 16 in front of the furnace 12 and are arranged perpendicular to this. The carriage 14 further comprises a base plate 17, on the except a vertical support 18 is attached to the wheels 15,

ίο dessen unteres Ende in eine auf der Mitte der Platte 17 vorgesehene Öffnung eingeschweißt ist. Das untere Ende des Trägers 18 durchsetzt ein ringförmiges, nach oben gerichtetes Drucklager 19, welches in das untere Ende einer drehbaren Vertikalmuffe 20 eingreift und diese abstützt, welche wiederum auf den Träger 18 aufgepaßt und um dessen Achse drehbar ist. Das obere Ende der Muffe 20 trägt ein Paar zylinderförmiger Arme 21 und 22, deren Achsen auf der gleichen Ebene verlaufen wie diejenige der Muffe 20 und des Trägers 18. Unter Bezugnahme auf die Ofenvorderseite, d. h. die in F i g. 1 nach links gerichtete Seite, ist ersichtlich, daß der Arm 21 hinter der Muffe 20 und der Arm 22 vor der Muffe 20 verläuft, wobei die freien Enden dieser Arme ein Joch 23 bzw. eine verstellbare Fassung oder Einspannteil 24 tragen.ίο its lower end in one on the middle of the plate 17 provided opening is welded. The lower end of the carrier 18 penetrates an annular, upwardly directed thrust bearing 19 which engages in the lower end of a rotatable vertical sleeve 20 and this supports, which in turn fitted onto the carrier 18 and rotatable about its axis is. The upper end of the sleeve 20 carries a pair of cylindrical arms 21 and 22, the axes of which are the same plane as that of the sleeve 20 and the bracket 18. With reference to FIG Furnace front, d. H. the in F i g. 1 to the left, it can be seen that the arm 21 is behind the sleeve 20 and the arm 22 extends in front of the sleeve 20, the free ends of these arms being a Wear yoke 23 or an adjustable socket or clamping part 24.

Der Formträger 13 umfaßt ein röhrenförmiges, zylindrisches Gehäuse 26, das vermittels Drehzapfen 27 am rückwärtigen Ende des Gehäuses am Joch 23 angelenkt und um eine horizontale, die Drehzapfen 27 durchsetzende Achse schwenkbar ist. Das andere Ende des Gehäuses 26 umfaßt ein Paar nach unten gerichteter Zapflager 28, die schwenkbar mit dem Oberende einer nach unten verlaufenden Stange 29 verbunden sind, welche den Einspannteil 24 durchsetzt und an diesem lösbar festgelegt ist. Durch Lösen und Anziehen des Einspannteils 24 ist die Stange 29 in Vertikalrichtung beweglich, um das Gehäuse 26 und den Formträger 13 in die gewünschte Winkelstellung zu drehen oder zu verschwenken. In der dargestellten Ausführungsform beträgt der Winkeleinstellungsbereich ungefähr 35°.The mold carrier 13 comprises a tubular, cylindrical housing 26, which by means of pivot pins 27 hinged at the rear end of the housing on the yoke 23 and around a horizontal pivot pin 27 penetrating axis is pivotable. The other end of the housing 26 includes a pair downward directional pivot bearing 28 pivoted to the top of a downwardly extending rod 29 are connected, which penetrates the clamping part 24 and is releasably fixed on this. By solving and tightening the chuck 24, the rod 29 is vertically movable around the housing 26 and to rotate or pivot the mold carrier 13 into the desired angular position. In the In the illustrated embodiment, the angle adjustment range is approximately 35 °.

Der Formträger 13 umfaßt weiterhin eine röhrenförmige, zylindrische Hauptantriebswelle 30, die vermittels geeigneter Lager im Gehäuse 26, und zwar koaxial dazu, drehbar ist. Die Welle 30 ist länger als das Gehäuse 26, und die Enden der Welle 30 ragen über diejenigen des Gehäuses 26 hinaus. Das Vorderende der Welle 30 trägt ein Kettenrad, das von einer Kette 32 mitgenommen ist, welche ihrerseits von einem Kettenzahnrad angetrieben wird, das mit der Antriebswelle einer Einheit aus einem Geschwindigkeitswechselgetriebe und einem Elektromotor 33 verbunden ist, die auf einer Supportplatte 34 montiert ist; letztere ist auf das obere Vorderende des Gehäuses 26 aufgeschweißt, wobei das Getriebe eine Kupplung aufweist, die ein Verdrehen von Hand entgegengesetzt zur Antriebsrichtung ermöglicht.The mold carrier 13 further comprises a tubular, cylindrical main drive shaft 30, which by means of suitable bearings in the housing 26, namely coaxial with it, is rotatable. The shaft 30 is longer than the housing 26, and the ends of the shaft 30 protrude beyond those of the housing 26. The front end of the shaft 30 carries a sprocket which is of a Chain 32 is entrained, which in turn is driven by a sprocket that is connected to the Drive shaft of a unit composed of a speed change gearbox and an electric motor 33 connected which is mounted on a support plate 34; the latter is on the upper front end of the case 26 welded on, the transmission having a clutch which opposes turning by hand allows for the drive direction.

Das rückwärtige Ende der Welle 30 ist mit einem Querarm 35 eines rechtwinkligen Rohres verbunden, auf dessen einem Ende ein nach hinten verlaufender röhrenförmiger Arm 37 festgelegt ist. Der Arm 37 trägt an seinem rückwärtigen Ende ein Joch 38, das eine Drehwelle 39 drehbar abstützt, an deren radial innerem Ende eine Formtragplatte 40 festgelegt ist. Der Formträger umfaßt eine U-förmige Halterung 41, die mit Hilfe von geeigneten, lösbaren Feststellmitteln, z. B. Bolzen, auf der Platte 40 gesichert ist und dieThe rear end of the shaft 30 is connected to a cross arm 35 of a right-angled tube, on one end of which a rearwardly extending tubular arm 37 is fixed. The arm 37 carries at its rear end a yoke 38 which rotatably supports a rotary shaft 39, at the radial inner end of a mold support plate 40 is set. The mold carrier comprises a U-shaped bracket 41, with the help of suitable, releasable locking means, e.g. B. bolt, is secured on the plate 40 and the

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Claims

3 43 4

Form 10 carries so that the axes of rotation of the shafts 30 The furnace 12 further comprises a fresh air

and 39 through the center of the mold extend inlet 66 and an outlet opening 67, which at one

and intersect at right angles. suitable outlet connection 68 is connected. the

The shaft 39 is a valve disposed at its air flow through the inlet and outlet is rotated by the bevel gear 43 about its own axis, with 5 a movable valve or a slide valve 69, the bevel gear with a further bevel gear 44 in regulated by operation of a Handle 71 is engaged, which is located on a coaxially to and internally between the fully extended and dashed lines thereafter rotatably mounted shaft 45 by the arm 37 positions according to FIG. 2 is movable around which is mounted. At its front end, the shaft 45 carries air into and out of the heating chamber from a chain sprocket wheel driven by a chain 46. The adjustment elements for the centrifugal fan are, in turn, supported by a sprocket wheel and the heating can be assumed in on the outside of the furnace; the latter is to be provided on the rear end arranged switch housing 70,
a drive shaft 47 is applied, which is mounted on the inside of the furnace front part, two doors 72 and 73 and coaxially to the shaft 30. The articulated rotatable about vertical axes. The doors drive shaft 47 is longer than the shaft 30, and their 15 are laterally spaced so that they protrude beyond those of the shaft 30 ends. limit an opening that the wall 52 in the The front end of the shaft 47 carries a chain tooth position shown in the drawing cover wheel, which is driven by a chain 48; the chain can. The doors 72 and 73 carry a pair of hooks 74, 48 is connected to a sprocket wheel which acts on the output shaft of a variable speed gearbox and a 20, which is combined with a locking rod 75, so that the doors 72 and 73 are carried to close the electric motor 49, which is next to the motor of the front part of the chamber 61 are lockable.
33 are arranged on the plate 34, the Ge. _u
drove a manually operated overrunning clutch
grasps. The chains 32 and 48 and the sprockets At the beginning of the casting cycle, the carriage 14 can be covered by a protective housing 50. 25 away from the furnace 12 to a loading station. The motors 33 and 49 can roll separately or simultaneously, where the mold 10 is actuated on the casting device in order to close the mold 10 around the axis. The carriage 14 is then rotated on the shaft 30 or around the axis of the shaft 39. the rails 16 up to the stop of the wall 52

The carriage 14 also carries a vertical cladding rolled on the furnace, the doors 72 and 73 are maneuvered or the furnace wall 52 closed and locked with the aid of a support 30. Subsequently, the plate 53 and an angle plate 54, which are set on the motors 33 and 49 in action so that they fasten the sleeve 20 and fling them vertically under the mold 10 as desired, and the radially spaced angle parts 55 are connected to the fan 62 and the heaters 63 and 64 will be. The wall 52 has a first opening 56, fed so that it can blow hot air through the chamber 61 through which the arm 21 passes and which is blown out in this way. During the heating operation, the form is that they open the space around the arm on the slide 69 in FIG. 2 position shown in full extension, where it penetrates the wall, brought as far as possible so that the air only passes through the furnace and seals as possible. It also has the being circulated. When the material is hot, the wall is distributed vertically above the opening 56 and spreads over the inner surfaces of the mold 10 and the second opening 57, which is penetrated by the housing 26 solidifies 4 ° depending on its special properties, and which is shaped such that an angular adjustment After the initial solidification of the material of the mold carrier 13 is possible. The opening 57 can stop the rotation and the mold can be left in the oven, partially closed by an adjustable closure, until the material, e.g. B. by seals, the two vertically displaceable plates 58 polymerization, completely solidified. Now the and 59 includes, which are switched off on the opposite 45 heaters 63 and 64, and the sides of the wall run in rails and vertical slide 69 is adjustable in the position shown in dashed lines, so that their adjacent ones are brought; edges cut out to allow cold air to be drawn into the oven and through the exterior of housing 26 to accommodate chamber 61, outlet 67 and nozzle 68 as closely as possible are then applied to housing 26 through inlet 66. Blow 5 °. After the oven has cooled down sufficiently and

The furnace 12 is an electrically heated air circulator, the centrifugal fan is stopped, the rolling furnace and is withdrawn from a plurality of legs 60 above the carriage or removed from the furnace, half supported so that the rails are then the mold together with taken from the object 16 and the carriage 14 cast along its underside,
stretch when - as shown in the drawing - the wall is in place. Apparatus for centrifugal casting of a great number of works - as can be seen most clearly in FIG. 2 can be seen, the substances and synthetic resins, such as. B. vinyl polymers, furnace 12, a heating chamber 61 in which the form of polyethylene, etc., can be used, but this is centrifuged and in which air is circulated by means of a special radial device for centrifugal casting fan 62. The circulated 60 formed by caprolactam. The furnace is constructed for this special air by means of an electrical resistance heating material, that the 63 is heated, which reaches a maximum temperature of 260 ° C at the outlet of the fan 62 and in the air.
Entrance into the chamber 61 is arranged, as well as through _ ...
an electronic claim provided at the exit of chamber 61:
Irish resistance heater 64. Above the 65 1st device for making a hollow heater 64, a plurality of curved deflecting plastic objects are mounted in a hollow multi-sheet metal 65, which ensure a uniformly divided shape by rotational molding, with the currents of the furnace. The axis of rotation of the shape in relation to the vertical

is inclined, with a furnace having a heating chamber and an opening leading to this, with an arrangement for the rotatable mounting of a mold carrier, with one for driving the Mold carrier serving motor and with a supporting the arrangement with the motor and mold carrier Trolley for moving the mold carrier in and out of the furnace, characterized in that that the axis of rotation of the mold carrier (13) is perpendicular to the axis of rotation of the mold (10) and that the mold (10) is connected to the mold carrier via transverse arms (35, 37) arranged at right angles to one another (13) is connected.

2. Apparatus according to claim 1, characterized in that the mold carrier (13) has a Drive shaft (47) is provided, the axis of which coincides with the axis of the mold carrier (13).

3. Apparatus according to claim 1 or 2, characterized in that the drive shaft (47) for the mold (10) lies in a tubular housing (26) and that the motor (11) for Protection from the heat in the furnace (12) is arranged outside the housing (26).

4. Device according to one of claims 1 to 3, characterized in that one another separate drives (32,46,48) for rotating the mold suspension (41) around the intersecting one Axes are provided and that the speeds of rotation about the various axes can be different.

5. Device according to one of the preceding claims, characterized in that the Inclinations of the mold carrier (13) are adjustable.

6. Device according to one of the preceding claims, characterized by means (62 to 65) for heating and circulating the air in the heating chamber (61).

7. Apparatus according to claim 6, characterized in that a flow channel with a Inlet and an outlet with the heating chamber (61), with an outflow opening (66) and one Fresh air inlet (68) is in communication, and that a valve (69) between a first position is circulated in the air in the heating chamber (61), and a second position, in the air off, is sucked, is adjustable. '

1 sheet of drawings