Mould-less large-caliber PVC pipe dynamic molding method and device

Abstract

The invention discloses a mould-less large-caliber PVC pipe dynamic molding device and method. The device is mainly composed of an extruder, a film bracket, bracket rolls, a bracket motor, a heating box, a three-point circle setting instrument, rollers, pressure rollers, supporting rollers, a pipe support frame, a support frame motor, guide rollers, a guide roller motor, guide rails and an ultrasonic welding instrument, etc. The three-point circle setting instrument can be used for continuous molding, and the PVC pipe length is not restricted by a roller mould. Compared with existing PE large-caliber pipes, the PVC raw material is much cheaper than PE, thus greatly lowering the production cost. The device provided by the invention omits the large-caliber roller mould, thus being able to save demoulding time and improving the molding efficiency. Also, the ultrasonic welding temperature is precisely controlled, thus effectively avoiding the PVC degradation problem caused by a high melting welding temperature. And the welding is fast. The mould-less large-caliber PVC pipe dynamic molding method and device provided by the invention can be used for molding large-caliber PVC smooth wall round pipes and outer corrugated pipes simultaneously.

Description

technical field [0001] The invention relates to a dynamic forming method and device for a large-diameter PVC pipe without a mold, and belongs to the field of pipe forming. Background technique [0002] Large-diameter pipelines are the main artery in the pipeline transportation industry. They are mainly used in energy conservation and environmental protection, water conservancy construction, municipal public facilities network, new rural urbanization construction, agricultural irrigation, sewage treatment, etc. Due to the light weight of plastic pipes, convenient construction, and outstanding advantages in energy saving, land saving, water saving, and material saving, "replacing steel with plastic" has become an inevitable trend in the development of the pipe industry. According to the "Tenth Five-Year Plan of the National Chemical Building Materials Industry and the 2010 Development Planning Outline", the promotion and application of plastic pipes will be vigorously develope...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to design a method and device for dynamic forming of large-diameter PVC pipes without molds, aiming at the deficiencies in the prior art such as complex equipment, high cost, and complicated process, and utilizes an ultrasonic welding device to perform gap welding of PVC pipes. It is a rollable cylinder. The welding head is pressed on the PVC sheet and rotates with the roller to realize the synchronization of extrusion, winding and welding. When winding a circle of Ω-shaped PVC Shaped PVC sheet is melted and welded, and the formed PVC pipe is caught by the pipe support frame, which can realize dynamic welding and continuous production, which not only simplifies the device, but also greatly improves the forming efficiency of large-diameter PVC pipe

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