Method for automatic centering, cutting and welding of steel strip in spiral steel pipe production line

Abstract

The invention provides a device and method for automatic centering, cutting and welding of strip steel in a spiral steel pipe production line. The edge of the flying welding trolley in the device is equipped with four sets of symmetrical deviation correction gratings, the two ends of the flying welding trolley are respectively equipped with a feeder and an uncoiling mechanism, the middle part of the flying welding trolley is equipped with a cutting mechanism, and the two ends of the cutting mechanism The welding mechanism and the No. 3 roller are respectively installed on the sides, and the vertical roller is installed on the right side of the No. 3 roller. The flying welding trolley is set in the pit, and the flying welding trolley moves along the trolley guide rail. The method is carried out according to the following steps: 1. Input of parameters; 2. Centering operation of strip steel; 3. Calculation of centering size of strip steel; 4. Cutting of strip steel; 5. Welding of strip steel. In this method, the head and tail of the strip are centered separately, and the flying welding trolley completes the cutting and welding operations while moving synchronously with the strip. The equipment used in this method has a high degree of automation, and the centering effect of the strip is good, which greatly improves Improve production efficiency and reduce production costs.

Description

technical field [0001] The invention relates to the technical fields of petroleum machinery and spiral steel pipe production line centering strip steel centering and head and tail trimming, and in particular to a method for automatic centering, cutting and welding of steel strips in a spiral steel pipe production line. Background technique [0002] In the actual production process of the spiral welded pipe production line, the steel plate needs to be uncoiled and then centered with the previous steel plate, and then welded after the centering treatment is completed, and finally the pipe is rolled to form a spiral welded pipe. At present, the steel plate centering methods in the prior art include: 1. The method of plate width measurement: the plate width measurement technology uses a combination of a linear laser and an industrial camera to measure the width. First, set a linear laser on the top of the plate. The laser emitted by the laser is parallel to the width direction o...

AI Technical Summary

Problems solved by technology

First of all, the flying welding trolley moves during the alignment process, while the linear laser is suspended in the air and cannot move with the flying welding trolley

Secondly, the industrial camera is suspended in the air, and the field of view of the camera is a fan-shaped area, coupled with the light source pollution on the work site, the measurement deviation is large and the accuracy is not high

[0004] The strip position detection method can detect the edge position of strip steel well in practical application, but the shape of strip head and tail is generally irregular, and this method cannot be accurately centered.

And its main parts need to be imported in order to meet the precision requirements, and the price of the equipment is very expensive

[0005] In actual production, during the centering process of the flying welding trolley, the strip steel is not trimmed, and the strip steel fails to be aligned after the centering process, and the phenomenon of strip milling occurs. These problems seriously affect the steel pipe forming process. quality

Neither of the above two methods can meet the technical parameter indicators required for the production of spiral welded pipes: strip width: 800-1600mm, strip material: ≤ X80, unit operating speed: 0-5m / min, position detection accuracy: ±1.5mm, Therefore, it is urgent to design a method for automatic centering of the head strip

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