Machine for the welding of plastic profiled elements

1 . A machine for the welding of plastic profiled elements, comprising:

at least one base frame;

retaining means of a first profiled element and of a second profiled element made of plastic material, which extend along respective longitudinal directions and are each provided with at least one area to be welded substantially inclined by an angle comprised between 10° and 80° with respect to said respective longitudinal direction and which each comprise at least one main face substantially parallel to said longitudinal direction and square-shaped, wherein the main face of the first profiled element is projected with respect to the respective area to be welded and the main face of the second profiled element is recessed with respect to the relevant area to be welded, said retaining means being associated with said base frame and being adapted to retain the profiled elements with said areas to be welded facing each other;

removal means associated with said base frame and comprising a pair of milling tools arranged facing the respective areas to be welded, movable in rotation around a relevant axis of rotation and adapted to remove part of said plastic material from said areas to be welded;

suction means associated with said removal means and adapted to remove the residues of plastic material generated during the removal of said plastic material;

heating means associated with said base frame and adapted to heat said areas to be welded;

displacement means of said retaining means adapted to displace said profiled elements between a mutual away position and a mutual approaching position, wherein said heated areas to be welded are joined together and wherein said main faces form a square joint;

wherein said suction means comprise at least one suction duct arranged around a respective milling tool and elongated along the relevant axis of rotation, which comprises a substantially flat abutment portion adapted to internally abut against said main face of the first profiled element during the removal of said plastic material.

2 . The machine according to claim 1 , wherein said abutment portion lies on a substantially horizontal plane.

3 . The machine according to claim 1 , wherein said abutment portion is arranged below said milling tool.

4 . The machine according to claim 1 , wherein said suction duct defines a transit opening of said residues, facing said areas to be welded, said abutment portion being defined at the point where said transit opening is located.

5 . The machine according to claim 1 , wherein said transit opening comprises:

a first section lying on a first plane substantially vertical and perpendicular to said axis of rotation; and

a second section contiguous to said first section, lying on a second plane substantially vertical and inclined with respect to said first plane.

6 . The machine according to claim 5 , wherein said second plane is inclined with respect to said first plane by an angle substantially equal to 135°.

7 . The machine according to claim 1 , wherein the machine comprises a positioning system of said removal means and of said suction means adapted to arrange said milling tools and said suction ducts at the point where said areas to be welded are located and to move said milling tools and said suction ducts along said areas to be welded to remove and take said plastic material away.

8 . The machine according to claim 7 , wherein said positioning system comprises:

at least one supporting frame of said removal means and of said suction means;

at least one guidance assembly associated with said supporting frame, extending along a first operating direction and supporting said removal means and said suction means in a sliding manner;

at least one guidance unit associated with said base frame extending along a second operating direction and supporting said supporting frame in a sliding manner;

controlled-axes actuator means adapted to move said removal means and said suction means along said first operating direction and along said second operating direction.

9 . The machine according to claim 1 , wherein said profiled elements comprise each a secondary face opposite said main face, said removal means being further adapted to make a groove on a peripheral edge of the areas to be welded at least at the point where secondary faces are located.

10 . The machine according to claim 9 , wherein the machine comprises containment means adapted to abut against at least said secondary faces at the point where said areas to be welded are located to contain a welding bead.