Recessed type tube head automatic welding machine

Abstract

The invention relates to a recessed type tube head automatic welding machine, comprising a rotating spindle, a machine body, a welding gun and a welding gun connecting plate, wherein the rotating spindle is penetrated in the machine body; the welding gun connecting plate is connected with the front side of the machine body along the axial direction; the welding gun is arranged on the welding gun connecting plate; a rotating spindle driving device is arranged, and the rotating spindle driving device comprises a driving motor and a worm gearing connected with the driving motor in a driving way;an axial adjusting mechanism is arranged, and the axial adjusting mechanism is connected with the machine body; a radial adjusting mechanism is arranged, the radial adjusting mechanism is connected with the welding gun connecting plate and the welding gun; and the welding gun connecting plate is provided with at least three positioning legs. Because the axial adjusting mechanism and the radial adjusting mechanism are combined, recessed tube head welding of a shell-and-tube heat exchanger is realized, thus not only expanding the welding range of the tube hole depth, but also avoiding the influence of form and position deviation of the tube hole on the welding quality, and the automatic welding machine has the characteristics of large welding range, good welding quality, high welding accuracy and simple operation.

Description

technical field [0001] The invention relates to an automatic welding machine, in particular to an automatic welding machine for retractable pipe heads which can be used for welding shell-and-tube heat exchangers. Background technique [0002] In boiler, petrochemical, nuclear power and other industries, shell and tube heat exchanger is a kind of heat exchange equipment that is widely used. The shell and tube heat exchanger is mainly composed of shell, tube and tube sheet. Among them, the tube The connection joint with the tube sheet is also called the tube head. One of the important processes in the production of shell-and-tube heat exchangers is to weld the tube heads as required. [0003] In the prior art, the tube head part of the welded connection protrudes from the outer surface of the tube sheet, so that the outer surface of the tube sheet has a discontinuous surface structure. This discontinuous surface structure is likely to cause cracks in the shell-and-tube heat e...

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Problems solved by technology

However, the middle part of this tube head automatic electric welding machine is provided with a positioning mandrel, so when the tube head retracts, the welding torch of the mandrel mechanism cannot enter the tube hole part of the tube head of the shell-and-tube heat exchanger. Therefore, the prior art The mandrel-type pipe head automatic welding machine in the paper cannot meet the welding method of the retractable pipe head, and if the traditional manual welding method is adopted, not only the operation is difficult and the efficiency is low, but also it is difficult to obtain continuous and uniform welding. seam

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