Longitudinal welded pipe inner weld reinforcement grinding machine

Abstract

The invention discloses a grinding machine for the residual height of the inner welding seam of a straight seam welded pipe. , the driving element drives the grinding trolley into the straight seam welded pipe to grind the residual height of the welded seam. The regrinding machine for the inner weld seam of the straight seam welded pipe of the invention can stably, reliably and automatically carry out the full-length or partial grinding of the inner weld of the steel pipe, which reduces the labor intensity of the staff and improves the operation efficiency. In addition, the overall structure of the grinding machine is simple, the adjustment method is simple and easy to operate; the related grinding parts are not easily damaged, and the maintenance cost is low.

Description

technical field [0001] The invention relates to a grinding machine, in particular to a welding seam grinding machine. Background technique [0002] The weld reinforcement of straight seam welded pipe is one of the important factors to judge the quality of the weld. Excessive weld reinforcement will not only increase the anti-corrosion cost of the welded pipe, but also lead to stress concentration at the weld toe, which will easily induce weld toe cracks and increase the service risk of the pipeline. The API 5L pipeline steel pipe specification clearly stipulates and requires the weld reinforcement, while high-standard steel pipes such as oil, gas and marine pipes further require that the weld reinforcement should not exceed 2.5mm. [0003] For steel pipes with excessively high weld reinforcement, manual grinding is usually used to remedy them. Compared with the outer weld, the manual grinding difficulty and strength of the inner weld are greatly increased. The reason is th...

AI Technical Summary

Problems solved by technology

Compared with the outer weld, the manual grinding difficulty and strength of the inner weld are greatly increased. The reason is that the space inside the pipe is narrow, and the noise and dust will seriously affect the physical and mental health of the workers.

At the same time, the efficiency of manual grinding is extremely low. For example, for a steel pipe with a length of 12m, if the full-length weld repair needs to grind away the 0.5mm weld reinforcement, it will take 1.5 hours to 2 hours

In addition, when the outer diameter of the steel pipe is less than Φ509mm, it is difficult for operators to enter the interior of the steel pipe with a smaller inner diameter to carry out operations. In this way, such steel pipes with excessive internal weld reinforcement can only be downgraded for use or scrapped.

Manual grinding has many disadvantages, such as high labor intensity, high occupational hazards, low efficiency, and small-diameter steel pipes cannot be ground in full length.

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