Sharpening machine for weld reinforcement in longitudinal welded pipe

Abstract

The invention discloses a sharpening machine for the weld reinforcement in a longitudinal welded pipe. The sharpening machine comprises a sharpening trolley comprising a trolley body, a sharpening grinding machine arranged on the trolley body, and a driving device connected with the sharpening trolley; a driving element drives the sharpening trolley to go into the longitudinal welded pipe to sharpen the weld reinforcement. The sharpening machine for the weld reinforcement in the longitudinal welded pipe is capable of performing total-length or local sharpening on a weld joint in a steel pipe stably, reliable and automatically, and therefore, the labor intensity of the working personnel is reduced and the working performance is improved. Besides, the overall structure of the sharpening machine is simple, and an adjustment method of the sharpening machine is simple, convenient and easy to operate; the involved sharpening parts are not easy to damage and low in maintenance cost.

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. In the API5L pipeline steel pipe specification, there are clear regulations and requirements for the weld reinforcement, and 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 increase...

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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