Device for welding tubes

A device for welding thermoplastic tubes of a first and a second group of tubes (1, 2), comprising two tube holders (100, 200) that respectively comprise a first (101, 201) and a second tube clamp (102, 202), as well as a welding knife (4),

• wherein the tubes of the first group of tubes (1) can be inserted into the through-openings (11, 21) of the two first tube clamps (101, 201) such that they continuously extend between the two tube holders (100, 200) in a straight manner and are squeezed therein,
• wherein the tubes of the second group of tubes (2) can be inserted into the through-openings (12, 22) of the two second tube clamps (102, 202) such that they continuously extend between the two tube holders (100, 200) in a straight manner and are squeezed therein,
• wherein the welding knife (4) can be moved between the first and the second tube holder (100, 200) and is provided for severing the squeezed tubes of the first and the second group of tubes (1, 2) in one motion in order to thereby produce cut ends (1′, 2′) and residual ends (1″, 2″),
• wherein one of the two tube holders (100, 200) can be displaced relative to the other tube holder (100, 200) in order to thereby align the cut ends (1′, 2′) of the tubes with one another, and
• wherein the two tube holders (100, 200) can be displaced toward one another or away from one another in a horizontal direction in order to thereby simultaneously weld each cut end (1′) of a tube of the first group of tubes (1) and each cut end (2′) of a tube of the second group of tubes (2) into respective continuous tubes.