Adhesive bonding and miscellaneous chemical manufacture – Surface bonding means and/or assembly means therefor – With casting – plastic molding – or extruding means
Patent
1991-11-25
1993-05-18
Weston, Caleb
Adhesive bonding and miscellaneous chemical manufacture
Surface bonding means and/or assembly means therefor
With casting, plastic molding, or extruding means
425110, 4251261, 4251291, 425576, 425588, B29C 4700
Patent
active
052117987
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an apparatus for the production of tubes made of prefinished pipe elements by pressing of a tube head from a heated plastic blank, where it is simultaneously bonded to the tube pipe, with a transport means which is indexed and stops at several work stations arranged at equal distances from one another, with mandrels that travel along to hold the pipe elements and dies arranged coaxial to the mandrels, which also travel along, and have central hole punches, if necesary, where the mandrels can be axially moved and are arranged to work together with a press punch in such a way that they can be inserted into the dies to press the tube head, as well as with a loading and unloading station and with an extruder and a metering device.
Such an apparatus is known from EP-175642-A1. In the known apparatus, both the mandrel and the die, which is arranged coaxial to it, are arranged to be movable relative to one another, on the guide of an indexing table. The pipe elements are passed into a free space between the mandrel and the die by means of a cone-shaped suction drum, and then pushed onto the mandrel. Therefore there has to be space between the mandrel and the die which must be at least somewhat greater than the length of the pipe element. Since tube elements can certainly have a sizable length, this results in large distances, which significantly increase the times for closing the press mold. Since the pressing forces also have to be transferred to the guides, these must withstand great stresses and therefore must be structured to be particularly rigid and involved. This makes the apparatus complicated and limits it with regard to cycle times, due to the large closing path. With such an apparatus, it is furthermore impossible to produce layered tube heads.
From DE-3816181-A1, a similar system for the production of prefinished pipe elements and head pieces of thermoplastic material is known, but here the mandrels can be pivoted out of the coaxial vertical position relative to the dies, into a horizontal position, for example to load and unload the mandrels, and so that it is possible to charge the dies with a blank. With this system, the stroke movements that are necessary are not as great as with the apparatus described first, but here, an additional pivot movement has to be accepted, which makes the kinematics of the apparatus complicated. Due to play and wear, the necessary precise alignment is lost very soon, so that waste is produced. In addition to the axial movement of the mandrels, the dies are also axially movable, which makes the apparatus more complicated and more susceptible to breakdown. In order to allow all these movements, the system has an extremely complicated construction.
It is the task of the invention to improve ar apparatus of the type stated initially in such a way that it allows a simple, light and compact but nevertheless stable construction, guarantees short movement strokes with avoidance of pivot movements, and makes it possible to achieve high working speeds.
Another task of the invention consists of structuring the new apparatus in such a way that it can also be used to produce tubes with a multi-layer tube head structure, with a defined, reproducible form of the individual layers of the tube head.
This task is accomplished by an apparatus with the characteristics of claim 1.
With the solution according to the invention, the mandrel can be moved out of the coaxial working position with the die, out of the range of the latter, as a result of which a material portion of a plastic is passed to the die--unhindered by the mandrel--on the one hand, and on the other hand, the mandrel is freely accessible from below, so that a pipe element can be pushed on, or a finished tube can be pulled off, without any movement around an axis of rotation being required.
The additional task is accomplished by an apparatus according to claim 1 in combination with the characteristics of claim 4.
Advantageous forms of the tube are evident from the dependent claims.
In the following, t
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patent: 4735761 (1988-04-01), Lindenberger
patent: 4834638 (1989-05-01), Miyahara et al.
AISA Automation Industrielle SA
Weston Caleb
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