Production apparatus for improving durability of steel plastic composite tube

Abstract

The invention discloses a production apparatus for improving the durability of a steel plastic composite tube. The apparatus comprises a steel plastic composite tube, a stainless steel liner and an expansion tool, one end of the stainless steel liner is provided with a flange, the expansion tool comprises a hand-operated hydraulic pump and an expander which are connected through a hydraulic oil tube, the stainless steel liner is embedded to the port of the steel plastic composite tube, the expander is embedded into the stainless steel liner at the port of the steel plastic tube, and the external diameter of the end of the expander embedded to the liner adapts to the internal diameter of the stainless steel liner. The flexible expansion of the expansion tool is used to make the liner completely cling to the port in a dead point and bubble free manner, so the port of the composite tube is well protected, and the service life of the tube is prolonged.

Description

technical field [0001] The invention relates to the technical field of production of plastic-lined pipe fittings, in particular to a preparation device for improving the durability of steel-plastic composite pipes. Background technique [0002] Steel-plastic composite pipe is a new type of composite pipe. According to the structure of the pipe, it can be divided into steel belt reinforced steel-plastic composite pipe, seamless steel pipe reinforced steel-plastic composite pipe, perforated steel strip steel-plastic composite pipe and steel wire mesh skeleton steel-plastic composite pipe. Composite pipe. At present, the most popular on the market is the steel belt reinforced steel-plastic composite pipe. The middle layer of this pipe is a steel belt layer formed by butt welding of high-carbon steel belt through crimping, the inner layer is high-density polyethylene, and the outer layer is galvanized. Layer, this kind of pipe is not only corrosion-resistant, no rust, no fouli...

AI Technical Summary

Problems solved by technology

[0003] Although the steel-plastic composite pipe has superior performance, it also has disadvantages

The existing plastic-lined grooved steel-plastic composite pipe and the plastic-lined external thread steel-plastic composite pipe are easy to damage the plastic inner pipe when the grooves are processed at both ends of the pipe or the external thread is processed.

In practical applications, each section of the cut pipe is connected according to the requirements, but the cut surface of the pipe is easily exposed. After long-term use, the penetration of liquid can easily cause the separation and rupture of the inner plastic layer, and the metal layer will subsequently occur. Oxidation and rust greatly reduce the service life of the pipeline

[0004] Therefore, it is necessary to carry out anti-corrosion treatment on the port of the steel-plastic composite pipe. At present, there is a technology to embed a bushing at the port of the steel-plastic composite pipe to achieve the purpose of protection. However, how to insert the bushing tightly against the pipe wall There is a certain difficulty in not damaging the plastic layer

[0005] Patent No. 201120345177.7 discloses a preparation device for oil pipe lined with stainless steel composite pipe, including hydraulic compounder, hydraulic expansion device, oil pipe and stainless steel liner. The oil pipe is equipped with a stainless steel liner, and the two ends of the oil pipe are respectively connected to the hydraulic composite pipe. The hydraulic compounder is connected to the hydraulic expansion device; the hydraulic compounder includes a jacket, a hollow screw, a screw nut, a sealing ring, and a plugging head. The hollow screw is covered with a screw nut, which is stuck at the opening of the jacket and can Free rotation, the other end of the hollow screw enters the inside of the jacket, and is fixedly connected with a plugging head, and a sealing ring is set on the plugging head; the hydraulic expansion device includes a liquid storage tank and a hydraulic pump. One end of the hydraulic pump is connected to the liquid storage tank, and the other end is connected to the The hollow screws in the hydraulic compounder are connected to each other, and the oil pipe is lined with stainless steel composite pipe by hydraulic expansion. The disadvantage of this device is that due to the injection of high-pressure oil into the oil pipe, the sealing ring is easy to leak, and this device It is only suitable for oil pipe lined with stainless steel composite pipe, not suitable for adding a bushing at one end of the pipe

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