Device for online measuring wall thickness of hot-rolled metal pipe by using gamma rays

Abstract

The invention discloses a device for online measuring the wall thickness of a hot-rolled metal pipe by using gamma rays, which comprises a horizontally movable field measurement C-shaped box, a gamma ray detector, a charge coupled device (CCD) camera, a radioactive source, a field control box with a programmable logic controller (PLC) and a measurement signal conversion unit, an industrial personal computer main cabinet, an exchanger, a database server, a terminal set, a field cooling circulation water channel, a gas circuit and an infrared temperature measurer. The device realizes continuousautomatic measurement on a hot-rolled metal pipe production line, and simultaneously can output control signals for realizing the automatic closed-loop control of a rolling mill. The CCD camera takespart in eccentricity correction calculation, so using restrictions to the measurement device are relaxed, and the measurement accuracy is improved and is lower than + / -0.2 percent. Simultaneously, measurement data is digitally transmitted, so the device realizes the long-distance and anti-interference transmission of the measurement signals and effectively solves the problems of long distance between a measurement field and an operating room and intensive field interference.

Description

technical field [0001] The invention belongs to the on-line measurement technology, and particularly relates to a device and method for on-line measurement of the wall thickness of hot-rolled metal pipes using gamma rays. Background technique [0002] On-line continuous wall thickness measurement of rolling metal pipes in the hot rolling production line is an important means of quality assurance of metal pipes. At present, domestic metal pipe units all use manual measurement of wall thickness. The shortcomings of manual detection are very prominent. Manual inspection is labor-intensive, and its inspection mode is random inspection. The consistency and accuracy of the inspection results cannot be guaranteed, and the lag of measurement is also quite obvious. At present, the latest foreign technology is to use laser to measure the wall thickness of pipes. However, due to the high price and incompleteness (continuous on-line measurement cannot be performed), the market prospec...

AI Technical Summary

Problems solved by technology

However, the difficulty of measuring the thickness of the pipe is much more difficult than the thickness measurement of the sheet and strip. To meet the measurement accuracy, two key problems must be solved.

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