Device for producing profiled tubes consisting of synthetic material

An apparatus for the manufacture of profiled plastic pipes, comprising

• a machine bed (1),
• which has a sliding surface (38) of a width b;
• half shells (2, 2′;
• 2a, 2′a), each of which having
• a lower side (30, 30′;
• 30a, 30′a), by which they are guided on the machine bed (1),
• an upper side with an upper indentation (16),
• a side wall (40, 40′, 40a, 40′a),
• a mold recess (27, 27′), and being provided
• with vacuum ducts (28, 28′;
• 28a, 28′a), which open into the respective mold recess (27, 27′), and
• with cooling channels (33, 33′;
• 33a, 33′a);
• a molding path (9),
• which runs in a direction of production (4) and
• on which the half shells (2, 2′;
• 2a, 2′a) mate together in pairs to form a mold;
• guides (12), which are adjustable horizontally and transversely to the direction of production (4) and act on the side walls (40, 40′;
• 40a, 40′a), pressing the half shells (2, 2′;
• 2a, 2′a) together in pairs on the molding path (9);
• a pipe die (25) upstream of the molding path (9) in the direction of production (4);
• vacuum connections (31, 31′), which are formed in the molding path (9) on the machine bed (1), passing through the sliding surface (38) and opening into the vacuum ducts (28, 28′;
• 28a, 28′a);
• cooling water flow lines (34, 34′), which are formed in the molding path (9) on the machine bed (1), passing through the sliding surface (38), and cooling water return lines (34, 34′), which pass through the sliding surface (38) and open into the cooling channels (33, 33′;
• 33a, 33′a);
• and
• at least one upper driving pinion (17), which is disposed above the molding path (9) and engages with the upper indentation (16) on the upper side of the half shells (2, 2′;
• 2a, 2′a), in the direction of production (4) advancing the half shells (2, 2′;
• 2a, 2′a) which mate together on the molding path (9) to form a mold;
• characterized
• in that two lower driving pinions (41, 41′) are provided on the machine bed (1) along the molding path (9) crosswise of the direction of production (4) and at a distance c from each other;
• and
• in that a first set of half shells (2, 2′) and a second set of half shells (2a, 2′a) are provided, which are to be arranged optionally on the machine bed (1), and of which the half shells (2, 2′) of the first set, between the side walls (40, 40′) and the lower side (30, 30′), have greater mold recesses (27) than the mold recesses (27′) of the second set and are provided with a lower indentation (39, 39′) which a lower driving pinion (41, 41′) engages with, and of which the half shells (2′, 2′a) of the second set are free from indentations.