Differential method tubular product radial stretching equipment and method

Abstract

The invention belongs to the field of tubular product stretching, and relates to differential method tubular product radial stretching equipment and method. An equipment body comprises a closed cylindrical air bag, one end of the air bag is provided with an air nozzle used for air inflation and air deflation of the air bag is arranged at one end of the air bag, a plurality of steel bars distributed in the axial direction of the air bag are evenly fixed to the outer surface of the air bag, the outmost side of the equipment body is provided with an electromagnetic device wrapping the air bag andthe steel bars, and the tubular product containing position is located between the electromagnetic device and the steel bars wrapping the surface of the air bag. According to the equipment and method, through mutual cooperation of the electromagnetic device, the air bag and the steel bars, a tube wall is firstly divided into a plurality of small units equally in the tubular product stretching process, and it is guaranteed that the pipe wall can be evenly stretched. After tubular products are stretched in the radial direction and the axial direction, the toughness and the inner pressure resistance of the tubular products are strengthened. The equipment is reasonable in structure and convenient to operate; and the method of conduct stretching through the equipment is simple and convenient,operation is easier, the beneficial effect of saving time and labor are achieved, and the tubular product stretching working efficiency is improved.

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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