Rolling forming production line of square tubes of multiple specifications

Abstract

Disclosed is a rolling forming production line of square tubes of multiple specifications. The production line comprises a coiled-disc steel plate strip unwinding frame, a steel plate strip guide device, a steel plate leveling machine, a square tube double-top-side rolling unit, a square tube double-side-edge rolling unit, a square tube forming unit, a square tube top side welding machine, a weld line polishing machine, a square tube cooling groove, a square tube straightening unit and a square tube fixed-length cutting-off machine which are mounted on one straight line. A vertical locating frame and a horizontal locating frame are arranged in the steel belt strip guide device, and a pad roller and a hydraulic leveling roller are mainly mounted on a rack of the steel plate leveling machine; the internal structure of the square tube double-top-side rolling unit is similar to the internal structure of the square tube double-side-edge rolling unit, and the square tube double-top-side rolling unit and the square tube double-side-edge rolling unit are each provided with an upper rotating shaft and a lower rotating shaft; the lower rotating shafts are provided with folding mat wheels, and the upper rotating shafts are provided with rolling wheels; a servo motor is arranged on the rack; a mat wheel is arranged on a lower shaft of a square pipe forming machine, a rolling wheel is arranged on an upper shaft of the forming machine, and a side pressing wheel is arranged between the upper shaft and the lower shaft; after a welding machine conducts welding on square tube gaps, fixed-length cutting is carried out after polishing and cooling; and the production line is used for producing the square tubes, the efficiency is high, and the quality is good.

Description

technical field [0001] The technology belongs to the technical field of production of large-diameter thick-walled steel pipes, and in particular relates to a rolling forming production line for multi-standard square pipes. Background technique [0002] Large-diameter thick-walled square steel pipe, also known as cold-bent steel profile, is made of steel plate as the base material, which is formed by cold bending and then welded by high-frequency. Wide range of uses. [0003] In the prior art, there are mainly the following two ways to produce large-diameter thick-walled square steel pipes: [0004] The first method: use a steel flat billet commensurate with the size of the final product, bend it with a bending machine, and undergo rolling sealing, lap welding, welding and straightening to form a large-diameter thick-walled square steel pipe. Using this method to produce large-diameter square steel pipes, because the bending machine can only fold one side of the square stee...

AI Technical Summary

Problems solved by technology

[0007] In view of the lack of special equipment for one-time rolling and welding of steel strips into square tubes in the existing technology, the production method of rolling and welding steel strips into round tubes, and then extruding the round tubes into square tubes, there is a production process Many, high production cost, difficult to maintain consistent product quality, the invention provides a multi-standard square tube roll forming production line to solve the problems existing in the prior art

Images