US 2024/0367367 A1Published application

Belling unit, automatic belling machine comprising said unit and method for belling pipes made of pvc-o

AssigneeSica S.P.A.

InventorsGiorgio TABANELLI, Giovanni VECCHI

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Abstract

A unit for belling PVC-O thermoplastic pipe includes: a forming pad for deforming into bell shape an end of the pipe, the pad having a longitudinal central axis of symmetry and a region for housing an annular gasket to be coupled, internally, to the pipe; an annular contact element fitted slidably on said pad to move along the direction of the axis, between an advanced position contacting the gasket, and a withdrawn position. A first heating device heats the contact element to a predetermined temperature by contacting an inner surface of the end portion of the pipe fitted on the annular contact element. A second heating device externally heats the pipe fitted on the pad, in a predetermined zone of the pad at the end of the pipe.

Claims17

Dependent claims

A unit for belling pipes made of thermoplastic material of the PVC-O type comprising:

a forming pad for deforming into the shape of a bell an end portion of a pipe made of thermoplastic material, said pad having a longitudinal central axis of symmetry and a region for housing an annular gasket designed to be coupled, internally, to the pipe made of thermoplastic material;
an annular contact element fitted slidably on said pad to move along the direction of said longitudinal central axis, between an advanced position of contact of the gasket, and a withdrawn position;
the unit being characterised in that it comprises, in combination:
a first heating device, configured for heating the annular contact element to a predetermined temperature in such a way as to heat by contact an inner surface of the end portion of the pipe fitted on the annular contact element;
a second heating device, configured for heating from the outside said pipe made of thermoplastic material fitted on the forming pad, in a predetermined zone of the pad at the end portion of the pipe made of thermoplastic material.

2 more elements

A method for belling pipes made of thermoplastic material of the PVC-O type, comprising the following steps:

preparing a forming pad designed to deform into the shape of a bell an end portion of a pipe made of thermoplastic material;
preparing an annular contact element, fitted on said forming pad, and movable along said forming pad between an advanced position, and a withdrawn position;
preparing an annular gasket on said pad in a predetermined region, said annular gasket being designed to be stably positioned in the bell to be formed;
positioning said annular contact element in the advanced position to make contact with the gasket prepared in the region;
preparing a pipe having an end portion heated to a predetermined temperature designed to allow the deformation;
moving, up to a predetermined distance, relative to each other said end portion of the pipe and said pad, towards each other in the direction of a longitudinal central axis of the pipe, for fitting said end portion on the assembly of said pad, said annular gasket and said annular element the method being characterised in that it comprises the following steps:
heating the annular contact element to a predetermined temperature in such a way as to heat by contact the inner surface of the end portion of the pipe surrounding the annular contact element and, simultaneously, heating said pipe from the outside.

4 more elements

Dependencies are inferred from the claim text.