Manufacturing device and process for inner tube of double-layer cooling tube

Abstract

The invention discloses a manufacturing device and a process for the inner tube of a double-layer cooling tube. The device mainly includes a magnet bar, a tube blank, a gantry frame, a beam, a guide rail, a preheating electrode, a welding electrode, a heating electrode, a squeezing roller and an infrared ray camera etc. The number of gantry frames is two, and they are connected by beams. There are three sets of guide rails on the beams. The three sets of guide rails are installed with preheating electrodes, welding electrodes and heating electrodes in sequence. Below the beam is the tube blank to be welded, and the interior of the tube blank is coaxial. Magnetic rods are installed, extrusion rollers are installed symmetrically on both sides of the V point of the tube blank, and an infrared camera (fixed on the gantry) is installed above the V point. The specific steps of the process are as follows: firstly, preheating the groove of the tube blank through the preheating electrode, and then through the welding electrode heating and the supplementary heating electrode to make the welding point temperature of the tube blank with different wall thickness reach the welding temperature, and the welding process is completed. The invention effectively solves the welding defects such as cold welding or over-burning that easily occur during welding of the variable-wall-thickness pipe, and improves the welding quality of the variable-wall-thickness pipe.

Description

technical field [0001] The invention relates to the field of welded pipe manufacturing, in particular to a manufacturing device and a process for the inner pipe of a double-layer cooling pipe. Background technique [0002] Double-layer cooling pipe, a double-layer pipe composed of an outer pipe and one or several inner pipes, usually, the outer pipe is a light pipe, and the inner pipe is provided with a number of fins or the wall thickness is constantly changing (inner and / or The outer surface is provided with protrusions or grooves, thereby accelerating the fluid flow rate and increasing the heat exchange area) high-efficiency heat exchange tubes. For double-layer cooling pipes, on the one hand, if the inner pipe suddenly breaks during service, the outer pipe can continue to work, leaving enough time for emergency repairs and greatly reducing economic losses; on the other hand, double-layer pipes can ensure that the outer pipe The fluid in the inner tube is not mixed with ...

AI Technical Summary

Problems solved by technology

[0003] The main purpose of the present invention is to overcome at least one defect of the above-mentioned prior art, provide a double-layer cooling tube inner tube manufacturing device and its process, and solve the problem of cold welding at the thick wall and excessive welding at the thin wall during the welding process of variable wall thickness pipes. Eliminate welding defects such as burning and improve the welding quality of pipes with variable wall thickness

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