SK5129Y1 - Device for butt welding of plastic pipe with press control - Google Patents

Abstract

An apparatus for butt welding plastic tubes is described with welding pressure control, which eliminates the disadvantages of the classical butt welding procedures for plastic tubes. Control of the pressure course of the welding of the plastic tubes (6) over time it provides a programmable frequency converter (1) which controls the source of the thrust (2) of the engine, which through a linear gearbox (3) provides welding pressure sensed by the pressure sensor (4) and the axial contact force of the welding jaws (5) to optimize efficiently process, while minimizing race size

Description

The technical solution relates to a device for butt welding of plastic pipes with welding pressure control. The technical solution serves to increase the quality parameters of welds of plastic pipe components in the area of water, gas and sewerage networks.

BACKGROUND OF THE INVENTION

In the case of butt welding of plastic pipes, the polymeric material melts at the ends of the pipes to be joined and joined under pressure. The construction and method of operating the currently used butt welding equipment for plastic tubes is adapted to the principle of increasing the welding pressure in the weld plane for the shortest possible time after the fused ends of the welded parts are pressed together. Uncontrolled welding pressure in the sense of e.g. Richtlinie DVS 2207, Teil 1: Schweissen von Thermoplastischen Kunststoffen. Heizelementschweissen von Rohren, Rohrleistungsteilen und Tafeln aus PEHD, 8/1995 does not allow optimum weld strength to be achieved, since some of the molten material is unnecessarily pushed out of the weld plane, resulting in a flow of polymer melt from the weld plane. The solidification flow inside the pipes becomes a source of hydraulic losses during the transport of the medium. On the outside of the pipeline it is exposed to the risk of damage during installation. In the event of a weld seam on the outside of the pipe or the formation of a corrosion crack on the internal roll, the material failure that has occurred will eventually spread to the surrounding wall of the pipe and cause the entire pipe to fail.

The essence of the technical solution

This drawback is overcome by a butt welding device for plastic pipes with welding pressure control in the weld plane. The control of the welding pressure over time is provided by a programmable frequency converter that controls the pressure source of the motor. The motor uses a linear gearbox to apply welding pressure to the plastic pipes and axial contact force of the welding jaws. Welding pressure is sensed by a pressure sensor, which effectively optimizes the welding process while minimizing the size of the race.

Overview of the figures in the drawing

The object of the utility model of a butt welding apparatus for plastic pipes with welding pressure control is shown in the block diagram in the figure.

Example

The butt welding device for welding butt welding plastics illustrated in the figure consists of welding jaws 5 in which the plastic tubes 6 are clamped and pressed against each other in the weld plane 6. The motor 2 is applied to the weld plane by the motor 2. the welding pressure supplied by the generated torque transmitted by the linear gearbox 3. The operation of the motor 2 is controlled by a programmable frequency converter 1. The indication of the applied pressure in the weld plane is controlled by a pressure sensor 4.

Industrial usability

Replacement of conventional hydraulic, mechanical, electrical, etc. The drive of the welding equipment by means of a motor powered by a programmable frequency converter is one of the possibilities to improve the butt welding process of plastic pipes. Welds produced by a controlled time-lapse algorithm of the welding process exhibit statistically significantly higher long-term strength, lower internal and external height, and lower hydraulic resistance to the flow of media than conventional butt welds.

Claims (1)

An apparatus for butt welding of plastic pipes with a welding pressure control, characterized in that it comprises welding jaws (5) for holding the plastic pipes (6), a source of motor contact force 5 (2) connected to a linear transmission (3), the frequency converter (1) being connected to the motor (2) and the linear transmission (3) connected to the pressure sensor (4).