Half-variable-radius circular arc framework-type preheating device

Abstract

The invention relates to a half-variable-radius circular arc framework-type preheating device. The half-variable-radius circular arc framework-type preheating device comprises preheating device tracks and roller frame tracks which are respectively arranged in parallel; the preheating device tracks are provided with an equilibrium bogie; the lower part of the equilibrium bogie is in contact with the preheating device tracks through installing equilibrium bogie walking wheels; the equilibrium bogie is provided with a preheating device installation frame; the upper part of the preheating device installation frame is provided with a preheating device; the preheating device consists of a heating device and a variable diameter device; the variable diameter device consists of at least two columns of variable diameter plates; each column of variable diameter plates are composed of a plurality of arc plates; adjacent arc plates are connected movably through pin shafts; two adjacent variable diameter plates are connected through connecting rods, and the connecting rods between two columns of variable diameter plates are uniformly provided with heating devices; the roller frame tracks are provided with walking roller frames; the walking roller frames consist of rotary mechanisms and conveying mechanisms; the rotary mechanisms are arranged in conveying supports of the conveying mechanisms. The half-variable-radius circular arc framework-type preheating device provided by the invention can be suitable for the weld preheating working procedure of cylinder bodies with different pipe diameters and different wall thicknesses, and also has the advantages of being wide in heating range, low in use cost, accurate in temperature control, capable of automatically correcting preheating temperature, convenient and safe to operate, and the like.

Description

technical field [0001] The invention relates to a welding preheating device, in particular to a variable radius arc frame type preheating device, which belongs to the technical field of equipment manufacturing. Background technique [0002] Preheating pipe fittings before welding is an effective way and way to improve welding performance and welding quality. Preheating before welding can reduce the cooling rate of welded joints, facilitate the diffusion and escape of hydrogen in the weld metal, and avoid welding cracks caused by residual hydrogen in the weld metal. It can reduce the temperature difference in the heat-affected zone, improve the stress condition, reduce the cooling rate, reduce the degree of hardening, and prevent welding cracks. In the prior art, different preheating equipment needs to be equipped for preheating of different pipe diameters, and the current pipe welding preheating equipment still has the disadvantages of small heating range, low efficiency, a...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a variable radius arc frame type preheating device, which can reduce the cooling speed of the metal in the heat-affected zone, avoid the occurrence of hardened structures, and at the same time better solve the problem of The problem of preheating before welding of cylinders with different diameters

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