DE8526188U1 - Centering device for extruder - Google Patents

Description

&igr;;i&Ggr; » uu.

Mtl « ·t CC ti

• ·■· &eacgr;. I tt

4 · * # ct &iacgr;&iacgr;&iacgr;

• · · · · ■ t te &igr;• · · · · t ( ( &igr;

• · · «it·· et t I

173/595

INOEX GmbH-, D-497Q Bad Qeynhausen 1

Centering device for extruder

The invention relates to a centering device

for extruders, where for the wall thickness correction of the pipe j:

j or tubular extrudate on the mounting flange

which the central core of the ring nozzle forming a f

Il ring gap surrounding centering sleeve circumferentially against Si

centering screws that are offset from each other.

A centering device of the aforementioned type with radially acting centering screws is described in DE-PS 96I 211. However, according to DE-OS 32 16 377, these centering screws can also be replaced by other support elements, for which the radial adjustment direction as well as the axial adjustment direction known from this publication is part of the state of the art.

I · I I

I I

CC II

I I I

It iii

I I

I I

The

173/595

All previous solutions are disadvantageously not suitable for automating the centering process with reasonable effort so that it can be integrated into a computer-controlled production process, as required by current industrial development;

The object of the invention is therefore to make a centering device available for the extrusion tools of extruders, which despite low technical effort allows a high degree of automation and at the same time the continued use of existing expensive injection tools in order to reduce costs.

As a solution to the problem, a centering device with the features contained in the claims is proposed. It therefore no longer works only or not at all with automatically operated actuators acting on the fastening flange of the centering sleeve, but at an axial distance from it directly on the centering sleeve itself. If the centering screws or similar support elements acting on the fastening flange also remain in use, they only have to take over the rough pre-centering of the centering sleeve before or when starting up the newly set up extruder, which can still be done without difficulty.

ititt i · · ··.·»

t* · tit &psgr; * * e

•&igr;· ii»·*·· it

•it Ii iii Ii *· ··

- 3 - · 173/595

by hand* If, however, new tools are used, pre-centering may be dispensed with, which is particularly true for the manufacture of thin-walled hoses and tubes. This also eliminates the abutting edge that would otherwise be required for the fastening flange, with the significant process-technical advantage that there are no more material deposits at this point that could lead to burns and thus to production interruptions.

An embodiment of the subject matter of the application is described below using the drawing. In it, in detail:

Fig. 1 shows the axial half-section of a centering device for extruders according to the invention, and

Fig. 2 is a front view of this device in the direction of the arrow in Fig. 1.

As can be seen from Fig. 1, the central core 1 of a ring nozzle 2 is surrounded by a centering sleeve 4, forming an annular gap 3. On the fastening flange 5 of the centering sleeve 4, which is provided with a heating band 6, grips against each other circumferentially from a carrier tube 7 that extends coaxially thereto and represents its holder.

/to

litiJ &igr; «» · * &igr;·

> t » it eeee

it I ti· t · i # ·

» ft t I t · · t « ■

III II· · · · f

- 4 - . 173/595

Offset, manually operated centering screws 8 to be used to move the fastening flange 5 for pre-centering the centering sleeve 4 relative to the core 1 on the ring nozzle 2.

According to the invention, the wall thickness corrections that may be necessary during extrusion according to the information from measuring devices are no longer carried out with the centering screws 8 as before, but with the help of four actuators that are offset from one another by 90° on the circumference of the centering sleeve 4 according to Fig. 2, held in the support tube 7, can be controlled jointly via supply lines 9 and are designed here as hydraulic piston-cylinder units 10. For this reason, the centering sleeve 4 has an elastically deformable area along its fastening flange 5, for which purpose a recess 11 there serves.

The advantageous operation of the described centering device lies in its fully automatic effect, in that the wall thickness corrections are carried out as required by increasing the pressure in one of the piston-cylinder units 10 using appropriate computer programs and simultaneously reducing the pressure on the opposite side.

* * t f &igr; t* &igr;· (&igr;

< «It · ■ 1 ·

< « · « tilt·

It &igr; « &igr; · &igr; Ii &igr;

« * fit till

It « t < t ( I « I«

- 5 - . 173/595

The device, which is very simple in its construction, can be retrofitted to existing extrusion tools without great expense while retaining the conventional centering screws 8, whereas the centering screws 8 can also be omitted for new tools. This would then result in a further modification of the embodiment, since the fastening flange 5 of the centering sleeve 4 would now have to be firmly screwed to the ring nozzle 2 or the carrier tube 7.

Claims (3)

&bull; · ··· P · rt r 3 73/595 INOEX GmbH, D-4970 Bad Oeynhausen 1 Centering device for extruders Claims: 1. Centering device for extruders, in which the wall thickness of the tubular or hose-shaped extrudate is corrected on the mounting flange of the central core j the ring nozzle to form an annular gap the centering sleeve is offset circumferentially against each other attack the centering screws, characterized in that the centering sleeve (H) is provided with an elastically deformable region (11) in its course along the fastening flange (5) and that instead of the existing centering screw ben (8) or in addition to this, on the circumference of the centering sleeve (4) arranged offset from each other actuators (10) with axial distance from the fastening &bull;■■■I · ·· ·· ·· * · I II·· · ■ · &bull; >■ It ··««■■ &bull;&bull;I I·· «··■ &bull; · · · · IkI · · t · ■· - 2 - . 173/595 flange (5) acts radially on the centering sleeve (4). 2. Centering device according to claim 1, characterized in that the axial distance from the j Mounting flange (5) on the centering sleeve (4) acting actuators by at least two pairs of parallel shafts, each opposite one another, in a coaxial Centering sleeve (4) extending support tube (7) or I » support frame held by a the wall thickness of the I Extrudate monitoring measuring device controlled jointly I erted hydraulic piston-cylinder units (10) are I delt. 3. Centering device according to claim 1 or 2, characterized in that the centering sleeve (4) has a recess (11) forming the elastically deformable region.