A kind of equipment and method for radial stretching of pipe material by differential method

Abstract

The invention belongs to the field of pipe stretching, and relates to a differential pipe radial stretching device and method. The equipment body includes a closed cylindrical airbag, and one end of the airbag is provided with an air nozzle for inflating and deflating the airbag; the outer surface of the airbag is uniformly fixed with a plurality of bars distributed along the axial direction of the airbag; the most An electromagnetic device covering the airbag and steel bar is arranged on the outside, and the pipe is placed between the electromagnetic device and the steel bar covering the surface of the airbag. In the present invention, the mutual cooperation of the electromagnet, the air bag and the bar steel realizes that in the stretching process of the pipe, the pipe wall is firstly divided into several small units to ensure that the pipe wall can be stretched evenly. After the pipe is stretched both radially and axially, its toughness and ability to resist internal pressure are enhanced. The structure of the device is reasonable and the operation is convenient; the stretching method using the device is simple and easy to operate, has the advantages of saving time and labor, and improves the efficiency of pipe stretching work.

Description

technical field [0001] The invention belongs to the technical field of pipe stretching, and relates to a differential pipe radial stretching device and method. Background technique [0002] As a commonly used building material in the construction industry, plastic pipes have the characteristics of low energy consumption, corrosion resistance, environmental friendliness and long service life. The molecules in the plastic pipe are curved, and the molecular structure can only become stretched after being stretched. The stretched molecular structure can be relatively regular, and the pipe can have high strength and toughness. Plastic pipes are produced by traditional production lines to form pipelines for daily use. However, this type of pipeline is only stretched by the tractor in the longitudinal direction of motion, and the degree of stretching in the radial direction is insufficient or uneven, making the tensile strength of the plastic pipe The strength is not high; in orde...

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Problems solved by technology

Plastic pipes are produced by traditional production lines to form pipelines for daily use. However, this type of pipeline is only stretched by the tractor in the longitudinal direction of motion, and the degree of stretching in the radial direction is insufficient or uneven, making the tensile strength of the plastic pipe The strength is not high; in order to solve the problem of tensile strength, the general method is to change the formula of the plastic pipe and add reinforcing components, or add reinforcing materials to the plastic pipe, but these two methods cannot solve the internal stress of the plastic pipe. question

For axial stretching, the existing process has the problem of low yield, and due to the uneven thickness of the pipe, the stretching is slow in thick places and fast in thin places, which is difficult to control

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