Steel pipe end defect detection and wall thickness detection

1. Steel pipe end defect detection

1.1. Steel pipe end large defect detection: After the steel pipe is sized by the sizing machine, the end of some steel pipes will have wrinkles and collapse inward, which will cause the laser probe of the steel pipe end wall thickness measuring device to be unable to extend into the steel pipe. Industrial camera shooting and image processing technology are used to detect steel pipe end defects. The image processing method is to identify whether there is a section of collapsed steel pipe wall in the inner hole of the steel pipe and the size of the collapse under the statistical model, and then determine whether the steel pipe end needs to be sawed.

1.2. Wall thickness defect detection: Through the steel pipe end defect detection introduced in 1.1, the measuring end of the laser thickness gauge can pass through the port of the measured steel pipe to detect wall thickness defects. After the steel pipe is rolled, there will be defects such as uneven wall thickness at both ends of the steel pipe, so each steel pipe must have a part of both ends cut off. Since the length of the defective steel pipe end of each steel pipe is different, it is difficult to determine the specific cutting length when cutting. The laser thickness gauge uses the laser principle to measure the wall thickness of the steel pipe end, which can complete this part of the work. It can determine the length of the defective steel pipe end by continuously detecting the wall thickness and marking the boundary between the defect and the qualified part through the marking machine to provide a dimensional basis for the steel pipe-cutting process.

2. Equipment composition

Because a steel pipe has two ends to be measured, two sets of measurement systems need to be installed at the same time.

The two defect measurement devices are located at both ends, and the measurements are performed in sequence at different positions. After the two devices complete the measurement, they need to communicate with each other to unify the measurement data to the same steel pipe number and transmit the measurement data to the overall information management system for easy query and later tracking.