FIELD: production of thermoplastic pipes with double walls and connective couplings.
SUBSTANCE: the invention is dealt with a method and a device for production of thermoplastic pipes with double walls and connective couplings. The method of production provides, that the first pipe is extruded into a molding tunnel containing at least one row of folds directed along a trajectory. The first pipe is configured as a corrugated pipe at least on one of the first sections and the pipe is made wider up to the size of the connective coupling at least on one of the second sections. The second pipe is extruded into the first pipe and pressed into the cavities of the first pipe crimps. During the time period, when the first pipe is configured as a corrugated pipe and the second pipe is extruded into the first pipe, the space between the two pipes is subjected to the action of pressure p1, which exceeds the atmospheric pressure. Before the first pipe making wider up to the connective coupling the space between the two pipes is subjected practically to the constant pressure p2 < p1. In the process of extrusion of the second pipe into the first pipe, that has been already widened up to the size of the connective coupling, the second pipe is subjected to action of the pressure p3, exceeding the atmospheric pressure, then it is pressed to the first pipe. Then the pressure p1 is again fed into the space between the two pipes. The device for realization of the method is also presented. The invention ensures an accurate widening of the first pipe for formation of a connective coupling on a corresponding section of the molding tunnel with the help of simple means.
EFFECT: the invention ensures an accurate widening of the first pipe for formation of a connective coupling on a corresponding section of the molding tunnel with the help of simple means.
16 cl,8 dwg
