DE2544668A1 - TOOL FOR MOLDING SEATS TO RECEIVE SEALS INSIDE PLASTIC PIPES - Google Patents

Description

Elmepla S.p.A. - Fusignano dl Ravenna - Italy «

"Yferkzeug for shaping seats for Acceptance of seals inside plastic pipes "·

The present invention relates to a mechanical device for machining the interior of plastic pipes to create seats or grooves intended for seals made of rubber or other To include material.

The originality of the proposed solution lies in the fact that, instead of the pressing process, it follows a pneumatic or mechanical expansion

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Machining process is applied in the cycle by means of a tool that is located within the Rotates tube and consists of an effective component of an eccentric, which gradually the predetermined Seat by squeezing the yielding or drawable pipe wall against an outer matrix of the ram.

For a better understanding of the invention, the following is an example rather than a restrictive one Way described an embodiment shown in the accompanying drawing · In the drawing shows:

the only figure shows the device according to the invention in Sectional view.

In the drawing, the reference number 1 denotes the pipe being processed, the reference number 2 the plug intended to expand the pipe itself, the reference number 3 the eccentric of a rotating on the axis of the plug 2 and of a motor 5 driven hollow shaft 4, with the reference number 6 a ring having a thickness equal to the depth of the seat to be made inside the pipe to be machined, with the reference number 7 a hydraulic (or pneumatic) cylinder for engaging the ring 6 of the eccentric 3 in Active position and for its disengagement and retraction into the hollow shaft 4 in the rest position, rib the reference number δ a press

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flanges specified, which together with an external ram 9 forms the die within which the tube 1 due to the displacement of the through the eccentric 3 moving ring 6 is deformed.

The processing takes place accordingly in the following way:

The heated and drawn tube 1 is inserted into the ram 9, while the plug 2 in turn is inserted into the pipe itself, causing its expansion.

The eccentric attached to the hollow shaft 4 and attached to the stopper rod is driven by the motor 5 is set in rotation and, together with the press flange 8, is moved forward by the hydraulic cylinder 7 jerked.

The ring 6 is forcibly disengaged from the hollow shaft 4} expanded by the eccentric 3 and begins the deformation of the seat as it is inserted into the die formed in the ram. The deformation is caused by the rotation of the eccentric itself along the entire circumference with the help of this Ring 6 completed.

After the pipe 1 has cooled and solidified, the hollow shaft 4 is driven by the hydraulic cylinder 7 withdrawn until the ring 6 is moved from its eccentric position, which is now back with the rod of the plug 2 is centered, allowing the pipe to be deployed. 3

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Claims (1)

PATENT CLAIMS 1.} Tool for shaping seats to accommodate seals within plastic pipes en in which this shaping, instead of being based on presses, results from a pneumatic, hydraulic or mechanical expansion of a plug, is achieved with the help of a tool that is inside of the pipe and consists of a ring with a thickness equal to the depth of the one to be formed Has seat, is hinged to an eccentric and from this latter against the die of the seat itself is pressed until the shape is caused, this ring forcibly extending along the moved by the die itself to a certain extent 2 · Tool according to claim 1, in which the heat-drawn tube to be machined is inserted into the Press plunger introduced, the plug in turn inserted into the pipe itself to carry out an extension is, with an eccentric, which is connected to a hollow shaft pivotably attached to the rod of the stopper is firmly connected by an external motor forced to rotate and in the direction of the ram, together with the press flanges by means of a hydraulic or pneumatic, also external cylinder is moved. 3 · Tool according to claims 1 and 2 in the one - 4th 60981 7/0832 Ring with a thickness equal to the depth of the one to be executed Seat and with a diameter equal to the inner diameter of the expanded tube in the hollow shaft hinged and, as a result of the displacement of this latter, forcibly engages with the eccentric comes, with the resultant offset the shape of the seat through the introduction of the ring is caused in the die of the press ram 4 · Tool according to claims 1, 2 and 3 «in the the rotation of the eccentric helps shape the seat along the entire circumference of the die of the said ring is completed » 5 · Tool according to claims 1, 2, 3 and 4 in the after completion of the shaping of the seat and the solidification of the pipe by cooling, the hydraulic (or pneumatic) cylinder pulls the hollow shaft back until the eccentric is disengaged from the ring and is brought into the centered position with respect to the stopper rod, so that the application of the Pipe is allowed 6, tool according to claims 1, 2, 3, 4 »5, at which the components and the arrangement of the same explained in the description text and infaer drawing Can be kind, or after each further, other Kind can be arranged differently and insofar as they realize the inventive idea 60981 7/0832 Blank page