PROCEDURE AND DEVICE TO DETECT A HEATING CONDITION OF A PIECE OF PLASTIC MATTER AND CONNECTION PIECE FOR THE WELDING OF ELEMENTS ALSO OF PLASTIC MATTER.

摘要

THE INVENTION IS ABOUT A FITTING PIECE EQUIPPED WITH AN ELECTRICAL RESISTOR (10) FOR THE WELDING OF ELEMENTS OF THERMAL FUSING PLASTIC MATERIAL. PURSUANT TO THE INVENTION, RESISTANCE IS PRESENTED IN THE FORM OF A SINGLE WIRE COVERED WITH AN ELECTRICALLY INSULATED LAYER AND PRESENTING CROSS POINTS; THE LAYER THAT COVERS IT IS FUSED AT A TEMPERATURE INCLUDED BETWEEN THE TEMPERATURE OF MELTING OF THE PIECES TO BE JOINED AND THEIR TEMPERATURE OF THERMAL DEGRADATION SO THAT THE SHORT CIRCUITS ARE GENERATED BY THE WIRE, AND THAT THE STOP OF THE POWER SUPPLY OF EAST LAST BEING COMMANDED. THE INVENTION APPLIES IN PARTICULAR TO THE HEAT-WELDING OF POLYETHYLENE TUBES USED IN THE GAS INDUSTRY.