Anti-collision method of fault detection frame for straight welded pipe fault detection

Abstract

The invention discloses a flaw detection frame anti-collision method for detecting the flaw of a butt welded tube, comprising: the flaw detection frame descending to the initial position; making the flaw detection frame moving ahead, and detecting the butt welded tube by the raster; and driving the descend of the flaw detection frame by a cylinder and detecting the flaw of the butt welded tube byan ultrasonic probe; detecting the descend of the cylinder by a detection element and outputting the detection signal; finally receiving the detection signal by a PLC and controlling the ascend of the flaw detection frame and stopping the advance of a flaw detection cart. The anti-collision method is simple and effective and the collision of the flaw detection frame and the welded tube bracket isprevented by performing the position-limitation detection of the descend of the cylinder and automatically controlling the ascend of the flaw detection frame and stopping the advance of the flaw detection frame; and the economic loss is reduced and the production efficiency is increased.

Description

technical field [0001] The invention relates to a flaw detection process of a straight seam welded pipe, and more specifically relates to a method for preventing collision of a flaw detection frame for flaw detection of a straight seam welded pipe. The collision prevention method can prevent the flaw detection frame from colliding with the welded pipe bracket. Background technique [0002] In the production process of medium-diameter oil and gas special longitudinal welded pipes, ultrasonic nondestructive testing (flaw detection) of the welded seams of welded pipes is the key to controlling product quality, please refer to Figure 1-Figure 4 As shown, at present, the commonly used detection method is: set the welded pipe 1 on the welded pipe bracket 2, and keep the weld seam facing upward. At the upper end, the flaw detection frame 11 of the flaw detection trolley 10 is driven down to a certain initial position by the lifting motor M1. The distance between 1 is always kept e...

AI Technical Summary

Problems solved by technology

[0003] However, please combine Figure 5 As shown, since there are many specifications of the produced straight seam welded pipe 1, and the diameter ranges from 217mm to 630mm. After the tail end of 1, the distance between the grating S1, S2 and the welded pipe bracket 2 is relatively close, so that the grating S1, S2 senses the welded pipe bracket 2, and mistakenly regards the welded pipe bracket 2 as the welded pipe 1, thinking that it has not left the welded pipe 1 , so that the piston rod 121 of the cylinder 12 has been kept in a downward working state, so when the entire flaw detection frame 11 leaves the pressed welded pipe 1, since the piston rod 121 of the cylinder 12 still has 2 / 3 of the margin, the piston rod 121 will continue to work. Stretch downward, and the translation motor M2 is still running to continue to drive the flaw detection trolley 10 to move forward quickly, causing the flaw detection frame 11 and the probes T1, T2, T3 to collide with the supporting rollers of the welded pipe 1, causing the flaw detection frame 11 to be hit Deformation, probes T1, T2, T3 and other components on the flaw detection frame 11 are seriously damaged. Since the probes T1, T2, T3 and other components are precision components, many of them are imported products, and the price is as high as tens of millions. Once damaged, it will not only cause serious damage. Economic loss, and the repair is time-consuming and labor-intensive, which seriously affects the production efficiency

Images