A method and device for dynamic forming of large-diameter PVC pipes

Abstract

The invention aims to overcome the defect that the large-aperture PVC pipe is difficult to produce in the prior art and provides a dynamic forming method and device for a large-diameter PVC pipe. The forming device comprises an extruder, a baking oven, an ultrasonic welding device and a large-diameter roller mould. Plasticizing extrusion is performed on PVC special materials by an extruder, the PVC special materials are transferred through a conveying belt, and are heated again through the baking oven on the conveying belt, meanwhile, a motor pulls the materials at a high speed, so as to enable the materials to be oriented in the extrusion direction, finally, the materials are wound on the surface of the large-diameter roller mould, the mould rotates while performs rectilinear motion forwards, the component force for mould performing rectilinear motion enables the materials to be oriented in the axial direction of the mould, the gapes among materials are welded and sewed through the ultrasonic welding device, a cylindrical welding head is pressed on the PVC material and rotates together with the mould, so that synchronous extrusion winding and welding are achieved, and the cycle is shortened greatly due to continuous production. The mould is shrinkable, the demoulding is convenient, and when the PVC-O pipe with the diameter of 2,000 or even larger is produced, all that is needed is to replace the roller mould with larger diameter.

Description

Technical field [0001] The invention relates to a method and device for dynamic molding of large-caliber PVC pipes, and belongs to the field of pipe molding. technical background [0002] Large-diameter pipelines are the aorta in the pipeline transportation industry. The development and production of high-strength, light-weight, wear-resistant, impact-resistant and corrosion-resistant large-diameter plastic pipes is one of the main development directions of the plastics industry in the future, and has been issued by the Ministry of Science and Technology and the State Planning Commission in July 1999. Guide to the Priority Fields of High-Tech Industries. [0003] At present, the general process of pipe production is: the material is plasticized and extruded by the extruder and then enters the mold, and then passes through the sizing sleeve, spray vacuum setting box and cooling water tank after cooling and setting, cutting and stacking to obtain pipe products. When producing large...

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Problems solved by technology

[0004] Compared with PE, the cost of PVC raw materials is low, and PVC pipes have a series of advantages such as corrosion resistance, oil resistance, acid and alkali resistance, pressure resistance, wear resistance, aging resistance and other incomparable advantages, making many domestic enterprises rush to develop large-caliber PVC Research on pipe forming technology. Since PVC is a heat-sensitive plastic, the processing temperature range of PVC is very narrow. Large-diameter PVC pipes with a diameter of more than 630mm have not been produced in China.

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