| 摘要 |
A lined pipe to form spirals (11) of a spiral-forming head for spiralling machines for metallic wire, comprising a plurality of anti-wear inserts including an inner hollow for the passage of the metallic wire and an outer surface connecting with the inner surface of the spiral-forming pipe (11), the wear-resistant inserts (10) being substantially all alike with a substantially annular conformation and a longitudinal dimension ("l") mating with the minimum radius of curvature of the spiral-forming pipe (11), rounded front faces (10a) at least partially convex and an inner through hollow (12) comprising a first segment (12a) to lead in and introduce the metallic wire and a second segment (12b) substantially cylindrical following the first. Method to recondition a spiral-forming pipe (11) of the spiral-forming head of spiralling machines for metallic wire, the pipe (11) including inside itself a plurality of wear-resistant inserts defining an inner hollow for the passage of the metallic wire and including an outer surface connecting with the inner surface of the spiral-forming pipe (11), the wear-resistant inserts (10) being inserted/extracted from the spiral-forming pipe (11) by means of a flexible cable element (13) including, at at least one of its ends (13b), constrainment means at least temporal (15) in contact with the inner hollow (12) and/or the front wall of the wear-resistant inserts (10), the cable element (13) with the wear-resistant inserts (10) being threaded from one mouth (11a, 11b) of the spiral-forming pipe (11) to take the first wear-resistant insert (110a) into an abutment position with an abutment element cooperating with the other mouth (11b, 11a), and therefore clamping the last wear-resistant insert with holding means, the wear-resistant inserts (10) being extracted from the spiral-forming pipe (11) by releasing the holding means and then by introducing the cable element (13) from the other mouth (11b, 11a) of the pipe (11), until the element of temporal constraint (15) comes into contact and then clamps itself against the inner hollow (12) and/or the front wall of the first wear-resistant insert (110a), thus extracting the whole assembly of wear-resistant inserts (10). <IMAGE> |
