Intermediate-frequency pipe bending machine

Abstract

The invention discloses an intermediate-frequency pipe bending machine which comprises a rack used for storing pre-bent steel pipes. A three-ring heating and cooling coil set is arranged at the frontend of the rack, wherein the three-ring heating and cooling coil set is used for being arranged on to-be-heated parts of the steel pipes in a sleeving manner and heats and cools the parts. The three-ring heating and cooling coil set comprises a heating coil, an air jetting coil and a cooling coil, wherein the air jetting coil and the cooling coil are arranged on the two sides of the heating coil correspondingly. The heating coil, the air jetting coil and the cooling coil are detachably connected into one through an adjusting assembly. The adjusting assembly can adjust the axial interval amongthe three coils so as to adjust the red strip size after the steel pipes are heated. The machine can achieve the purposes of controlling steel pipe heating red strips uniformly and controlling the temperature accurately, the phenomena of the wrinkle rate, the ovality and the like can be reduced, and the bending quality and the bending precision of intermediate-frequency bent pipes are enhanced. The needs of industries of aerospace, nuclear industry, petrochemical industry, ship building, electricity, vessel manufacturing, steel structures and the like for a larger number of intermediate-frequency hot-bent pipelines are met.

Description

technical field [0001] The invention relates to the technical field of pipe bending machines, in particular to an intermediate frequency pipe bending machine. Background technique [0002] In aerospace, nuclear industry, petrochemical, shipbuilding, electric power, container manufacturing, steel structure and other industries, a large number of intermediate frequency pipe bending pipes are needed. The intermediate frequency pipe bending machine uses intermediate frequency electric induction heating to heat the workpiece locally. The process of bending the intermediate frequency pipe is to put an induction coil on the part of the steel pipe to be bent, clamp the pipe head with a mechanical arm, and pass an intermediate frequency current into the induction coil to heat the steel pipe. When the temperature of the steel pipe rises to the plastic state , push forward with mechanical thrust at the rear end of the steel pipe, and bend it, and the part of the bent steel pipe is quic...

AI Technical Summary

Problems solved by technology

This method has poor precision when bending steel pipes, and it is easy to cause phenomena such as wrinkle rate and ellipticity correction, which reduces the bending quality and bending accuracy of intermediate frequency bending pipes, and affects the use of related equipment

Images