Forming unit for longitudinal welded pipe with ultra-large pipe diameter

Abstract

The invention relates to a forming unit for a longitudinal welded pipe with an ultra-large pipe diameter, which is characterized in that a longitudinal welded pipe forming unit comprising an empty curving flanging device, a cage roll forming machine and a pallet forming machine is sequentially arranged according to a forming process of the longitudinal welded pipe with the ultra-large pipe diameter; the empty curving flanging device comprises a stand, a clamping, conveying and centring device and a plurality of flanging mechanisms; the cage roll forming machine is an open type cage roll forming machine combined by an outer roll device and an inner roll; and each equal-rigid frame of the pallet forming machine comprises a frame body, an upper horizontal roll mechanism, an upper horizontal roll regulation mechanism, a slide seat, a supporting plate, a hydraulic cylinder, a lower horizontal roll mechanism, a lower horizontal roll regulation mechanism, a side vertical roll mechanism and aside vertical roll regulation mechanism. The unit is reasonable in arrangement and compact in designed structure; not only the longitudinal welded pipe with the ultra-large pipe diameter can be manufactured, but also ultra-heavy tools are not needed; in addition, the invention has the characteristics of high production efficiency, good forming quality, low investment cost, safety in operation, great convenience for use, and the like.

Description

technical field [0001] The invention belongs to welded steel pipe manufacturing equipment, in particular to a super-large-diameter straight seam welded pipe forming unit for producing welded steel pipes with a pipe diameter greater than ∮630 mm. Background technique [0002] At present, with the development of science and technology, all walks of life are increasing the number of conveying pipeline products in the machinery industry; for example, in the oil exploration industry, a large number of large-diameter and high-performance conveying pipes are required; especially pipe diameters larger than ∮630mm delivery pipe. At present, steel pipe manufacturers at home and abroad can only produce delivery pipes smaller than ∮630mm. Moreover, in the production and manufacture of conveying pipes smaller than ∮630mm, a single manufacturing method is adopted; for example, some foreign steel pipe manufacturers adopt the FEX forming method—that is, the flexible forming method; Roll f...

AI Technical Summary

Problems solved by technology

Therefore, trying to use each of the above-mentioned single manufacturing methods to produce delivery pipes larger than ∮630mm has become a difficult problem for steel pipe manufacturers at home and abroad. Seam welded pipe, which is covered with forming rollers on the forming surface of the workpiece. Although the forming effect of the steel pipe can be improved, the weight of one of the outer rollers needs to be more than ten tons. Such a large tooling is difficult to manufacture. According to the installation, but also a large investment

Images