DE3439215C1

DE3439215C1 - Device for pushing hose blanks onto straight or curved mandrels and for stripping hoses off from these mandrels

Info

Publication number: DE3439215C1
Application number: DE19843439215
Authority: DE
Inventors: Ewald 3140 Lüneburg Beecken
Original assignee: Phoenix AG
Current assignee: Phoenix AG
Priority date: 1984-10-26
Filing date: 1984-10-26
Publication date: 1985-12-05

Abstract

The invention relates to a device for pushing hose blanks made from rubber mixtures with or without reinforcing inserts from pre-mandrels onto straight or curved mandrels (heating mandrels) for producing hoses by vulcanisation and for subsequent stripping-off of hoses from these mandrels. The essential feature of this device consists in a cylindrical, radially adjustable clamping bellows made of elastomeric material being disposed in a metal sleeve, which clamping bellows clasps a part of the hose blank or of the vulcanised hose during pushing onto the mandrel and stripping off.

Description

Das Erfindungswesentliche besteht also darin, daß in einer Metallhülse ein zylindrischer, radial veränderbarer Spannbalg aus elastomerem Material, der wiederum in einem Hohlkolben eingespannt ist, eingebaut ist Diese Metallhülse wird auf einem Schlauchrohling, der locker auf einem Vordorn sitzt, aufgeschoben. Durch eine oder mehrere Düsen im Zylinder strömt soviel Druckluft (2 bis 3 bar), daß der Innendurchmesser des Spannbalges gerade so verringert wird, daß der Spannbalg fest auf dem Rohling aufsitzt, ohne diesen nach innen einzudrükken. The essence of the invention is that in a metal sleeve a cylindrical, radially adjustable bellows made of elastomeric material, the is in turn clamped in a hollow piston, is installed This metal sleeve is pushed onto a hose blank that sits loosely on a front mandrel. By one or several nozzles in the cylinder, as much compressed air flows (2 to 3 bar) that the inner diameter of the bellows is reduced just enough that the bellows is firmly seated on the blank without pressing it inwards.

Der durch den Spannbalg zangenförmig festgehaltene Schlauchrohling wird danach unter der Einwirkung eines Luft- bzw. Gleitmittelpolsters, das sich zwischen der Schlauchinnenwand und dem Vor- bzw. Krümmerdorn befindet, auf den Krümmerdorn (Heizdorn) aufgeschoben. Vor der Vulkanisation des nun aufgeschobenen Rohlings wird der Schubkopf durch Entspannen des Balges entfernt. Das Abziehen des vulkanisierten Krümmerschlauches erfolgt dann nach der gleichen Methode. The hose blank held in the form of tongs by the bellows is then under the action of an air or lubricant cushion, which between the inner wall of the hose and the front or elbow mandrel, on the elbow mandrel (Heating mandrel) pushed on. Before the vulcanization of the now postponed blank is the thrust head is removed by releasing the bellows. Peeling off the vulcanized The elbow hose is then made using the same method.

Bezüglich der Gestaltung der Vorrichtung und der Durchführung des Aufschiebens bzw. Abziehens sind nun zwei Varianten denkbar.With regard to the design of the device and the implementation of the Two variants are now conceivable for pushing on or pulling off.

A) Die Hülse und der fest damit verankerte Spannbalg, der nahezu die gesamte Innenfläche der Hülse einnimmt, bewegen sich beim Aufschieben und Abziehen gemeinsam mit dem eingespannten Schlauch in axialer Richtung des Vordorns. Auf diese Weise kann die in der DE-OS 30 42 167 beschriebene Vorrichtung weiterhin benutzt werden, indem man lediglich den dort beschriebenen Schubzylinder, der an einer Gliederkette beweglich gelagert ist und den Schlauch stirnseitig angreift, durch eine Hülse mit fest damit verankertem Spannbalg ersetzt, der den Anfangsbereich des Schlauches umklammert.A) The sleeve and the bellows that are firmly anchored to it, almost the occupies the entire inner surface of the sleeve, move when pushing on and pulling off together with the clamped tube in the axial direction of the front mandrel. To this Way, the device described in DE-OS 30 42 167 can continue to be used by only the thrust cylinder described there, which is attached to a link chain is movably mounted and engages the hose on the front side, with a sleeve replaces the bellows firmly anchored to it, which forms the starting area of the hose clutched.

B) Die Hülse, in der der Schlauch steckt, ist fest gelagert, d. h. sie bewegt sich beim Aufschieben und Abziehen nicht. Beweglich ist nur der auf Schienen oder Gleitunterlagen lagernde Spannbalg, der einen Teil der Innenfläche der Hülse einnimmt. Der Spannbalg bewegt sich also in axialer Richtung auf das andere Ende der Hülse zu, wobei der fest-geklammerte Schlauch mitbewegt wird (Vorschub).B) The sleeve in which the hose is inserted is firmly mounted, i. H. it does not move when it is pushed on and off. Only the one on rails can move or sliding pads supporting bellows, which form part of the inner surface of the sleeve occupies. The bellows therefore moves in the axial direction towards the other end to the sleeve, whereby the clamped hose is moved along with it (feed).

Nach dem Entspannen des Balges durch Luftentnahme wird dieser in die Ausgangsstellung zurückgebracht (Rücklauf). Nach erneuter Luftzufuhr und damit verbundenem Einspannen des Schlauches kann das Aufschieben bzw. Abziehen fortgeführt werden. Nach dieser Variante ist es möglich, Hülse mit Spannbalg am Ende des Vordorns bzw. im Anfangsbereich des Krümmerdorns aufgrund des geringen Raumbedarfes der unbeweglichen Hülse einzusetzen. Vorschubgeschwindigkeit und Anzahl der Balghübe sind stufenlos regulierbar. After releasing the air from the bellows, it is in returned to the starting position (return). After renewed air supply and with it connected clamping of the hose, the pushing on or pulling off can be continued will. According to this variant, it is possible to use a sleeve with a bellows at the end of the front mandrel or in the starting area of the manifold mandrel due to the small space requirement of the immovable Insert sleeve. The feed speed and number of bellows strokes are stepless adjustable.

Für das Ausbleiben der Faltenbildung beim Aufschieben - und dies selbst bei der Herstellung von kompliziert gebauten sowie dünnwandigen Schlauchkrümmern - sind hierbei zwei Faktoren entscheidend. Einmal setzt die Schubkraft durch den Spannbalg des Zylinders (Schubkopf) direkt (insbesondere nach der Vorrichtung nach Variante B) am Krümmerdorn an und nicht wie bei den bisherigen Vorrichtungen an der hintercn Stirnseite des Schlauchrohlings. Zum anderen ist der Schubkopf aufgrund seines elastischen Balges bis in den leicht gekrümmten Anfangsbereich des Krümmerdorns hineinführbar, womit eine verbesserte Weiterübertragung der Schubkraft auf den gesamten Krümmerdorn bewirkt wird. For preventing creases from forming when you slide open - and this even in the production of complex and thin-walled hose elbows - two factors are decisive here. Once the thrust continues through the Clamping bellows of the cylinder (thrust head) directly (especially after the device after Variant B) on the manifold mandrel and not on as with the previous devices the rear face of the hose blank. On the other hand, the thrust head is due its elastic bellows down to the slightly curved starting area of the elbow mandrel can be introduced, thus improving the transmission of the thrust to the entire Elbow mandrel is effected.

Im Gegensatz zu den bisher bekannten Vorrichtungen bietet die erfindungsgemäße Vorrichtung noch zwei besondere Vorteile. In contrast to the previously known devices, the inventive Device still has two special advantages.

1) Durch die Schub- wie auch Greifwirkung kann die Hülse mit dem eingebauten Spannbalg dazu verwendet werden, den Gummischlauch nach der Vulkanisation wieder von dem Krümmerdorn abzuschieben, wobei die Vorrichtung nach Variante B nur um 1800 geschwenkt eingesetzt werden muß.1) Due to the pushing and gripping effect, the sleeve can be attached to the built-in Bellows can be used to re-attach the rubber hose after vulcanization to push off the elbow mandrel, the device according to variant B only around 1800 must be used pivoted.

2) Durch den radial veränderbaren Spannbalg können Schläuche mit unterschiedlichen Durchmessern in den Schlauchkopf gespannt werden.2) Due to the radially adjustable bellows, hoses with different Diameters are clamped in the hose head.

Die hier speziell für die Herstellung von Krümmerschläuchen beschriebene Aufschieb- und Abziehvorrichtung ist selbstverständlich auch für die Herstellung von geraden Schläuchen geeignet. The one described here specifically for the manufacture of elbow hoses Push-on and pull-off device is of course also used for production suitable for straight hoses.

Die Erfindung wird bezüglich der Vorrichtung nach der Variante B in Verbindung mit einer Abbildung beispielsweise beschrieben. The invention is related to the device according to variant B in connection with an illustration, for example.

In einer starren, unbeweglichen Metallhülse 3 steckt der Schlauchrohling 2, der auf dem Vordorn 1 sitzt. Im Abschnitt a ist der Balg 4 aus elastomerem Material durch Zufuhr von Druckluft A durch die Düse 5 gespannt. Bei der Bewegung des Balges 4 in Vorlaufrichtung wird der Schlauchrohling ein Stück auf den Krümmerdorn aufgeschoben. Nach Entspannen des Balges 4 im Abschnitt b durch Luftentnahme B durch die Düse 5 wird dieser in Rücklaufrichtung wieder in die Ausgangslage gebracht. Der Gesamtvorgang wiederholt sich solange, bis der Schlauchrohling vollständig auf den Krümmerdorn (Heizdorn) aufgeschoben ist. Das Abziehen des vulkanisierten Schlauches verläuft analog. The hose blank is inserted in a rigid, immovable metal sleeve 3 2, which sits on the front mandrel 1. In section a, the bellows 4 is made of elastomeric material tensioned by supplying compressed air A through the nozzle 5. When moving the bellows 4 the hose blank is pushed a little onto the elbow mandrel in the forward direction. After releasing the bellows 4 in section b by withdrawing air B through the nozzle 5 this is brought back into the starting position in the return direction. The whole process repeats itself until the hose blank is completely on the elbow mandrel (Heating mandrel) is pushed on. The vulcanized hose is pulled off analogue.

Bei der Vorrichtung nach Variante B nimmt der festverankerte Balg 4 nahezu die gesamte Innenfläche der Hülse 3 ein. Das Aufziehen und Abziehen des eingespannten Schlauchrohlings bzw. Krümmerschlauches erfolgt dann nach der aus der DE-OS 30 42 167 bekannten Vorrichtung. With the device according to variant B, the firmly anchored bellows takes 4 almost the entire inner surface of the sleeve 3. The pulling up and pulling off of the clamped hose blank or elbow hose is then carried out after the DE-OS 30 42 167 known device.

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Claims

Claims: 1. Device for pushing a hose.

blanks made from rubber compounds with or without reinforcement inserts from pre-mandrels to straight or curved mandrels (heating mandrels) for the production of hoses by vulcanization as well as for the subsequent pulling off of hoses from them Thorns, characterized in that a cylindrical, radially adjustable bellows (4) made of elastomeric material, which when expanding and pulling off a part of the hose blank or the vulcanized hose clutched.

2. Apparatus according to claim 1, characterized in that the sleeve (3) and the bellows (4) firmly anchored with it, which covers almost the entire Occupies inner surface of the sleeve, when sliding on and off together with the Move the clamped hose in the axial direction of the front mandrel.

3. Apparatus according to claim 1, characterized in that the sleeve (5) is immobile when pushing on and pulling off and only the clamping bellows (4), which occupies part of the inner surface of the sleeve and on rails or sliding pads is stored, taking the clamped hose to the other end of the Sleeve is closed (forward), which then returns to its starting position after relaxing (Return).

4. Apparatus according to claim 3, characterized in that the feed speed and the number of bellows strokes are infinitely variable.

5. Device according to claims 1 to 4, characterized in that that the tensioning / releasing of the bellows (4) by supplying air (pressure 2 to 3 bar) I air extraction takes place via one or more nozzles (5)

6. Device according to claims 1 to 5, characterized in that the thrust force through the clamping bellows (4) when pushing directly (in particular according to the device according to claim 3) attaches to the heating mandrel

7th Device according to Claims 1 to 6, characterized in that the clamping bellows (4) can be changed radially so that a wide range of hose diameters can be used without retooling is guaranteed. The invention relates to a device according to the preamble of claim 1.

In motor vehicles, washing machines and dishwashers, tank filler necks and in the case of expansion joints, in addition to straight hose parts, elbow hoses in particular are used Made of rubber used They mostly have reinforcement inserts to prevent the occurring Pressing without difficulty being able to record for long periods of time. For the rubber compounds rubber types are preferred that are resistant to high temperatures and aggressive Chemicals are insensitive.

Due to the great importance of the elbow hoses, the Production of such hoses is special from a wide variety of points of view Attention has been paid, which is also reflected in numerous publications or is reflected in patents (DE-PS 21 40 956, DE-PS 22 05 971, DE-AS 24 22 557, DE-OS 24 42 076, DE-OS 2453510, DE-OS 2545 078, DE-OS 27 37 277, DE-PS 27 27 278, DE-OS 2832 257, DE-PS 30 30 950, DE-PS 30 30 951, DE-OS 30 42 167, EPA 01 00 573), although the end of the development is not yet in sight.

A wide development work has been carried out on the slide-on device from hose blanks to curved mandrels and for pulling off the vulcanized hoses dedicated to the elbow thorns, since the postponement over a long period of time and peeling off by hand was very laborious and time-consuming.

A first mechanization of the postponement process is from the DE-PS 21 40 956 known, where a pressure-resistant on the rear face of the hose blank Thrust cylinder attaches, which pushes the blank from the front mandrel onto the manifold mandrel. A further development of this device is described in DE-OS 30 42 167, but still pushing the hose blank from its rear Front surface takes place. Despite notable advances so far in this field have been achieved, wrinkles often still occur when the blank is drilled on the front side in complicated areas of curvature as well as thin-walled hoses, so that manual correction activity cannot be avoided. Another disadvantageous one Point of view is based on the fact that the thrust cylinder with regard to its diameter cannot be varied, which means that the device can be converted for different hose or mandrel diameter is unavoidable.

It also remains to be seen that it took a long time to peel off the vulcanized rubber hose a new device was necessary. So it's over DE-PS 30 30 950 known that the hose elbow essentially in the axial direction is subjected to a centrifugal force, usually a number of revolutions of 1000 Ulmin is sufficient.

With the centrifugal process, it is now a matter of pushing on and off the hoses with the same device possible (DE-PS 3030950, DE-PS 30 30 951), but here, too, there is manual correction capability during production of complicated hoses still unavoidable. In addition, that is Centrifugal process with time-consuming reconstruction work on the device connected if other hose diameters are required.

The object of the invention is therefore to provide a device of the initially mentioned to create named type, in which the pulling up of hose blanks even with the production of complex and thin-walled hose elbows runs mechanically. In addition, the opening and closing of the hoses should be different Diameter be feasible with a single device.

The solution to this problem is that in a metal sleeve a cylindrical, radially adjustable bellows made of elastomeric material is located, the part of the hose blank or the vulcanized one when expanding and pulling off Hose clutched.