Probe servo mechanism for eddy current inspection of main bolt inspection machine of nuclear pressure vessel

Abstract

The invention discloses a probe servo mechanism for eddy current inspection of a main bolt inspection machine of a nuclear pressure vessel, which is characterized in that the transmission mechanism comprises a linear guide rail, a constant-force leaf spring, a turnover seat, a pressure bar, a probe holder and a spring, wherein one end of the turnover seat is provided with a vertical bend and the other end thereof is provided with a support; a rectangular block is welded near the opposite side of the support; the pressure bar is of an L-shaped structure, a U-shaped fixture is respectively arranged at both ends of the pressure bar, the U-shaped fixtures are respectively connected with the support on the turnover seat and the arc-shaped probe holder and pined through cylindrical pin shafts, and the probe holder is attached to a main bolt; and the spring is fixed in the middle of the pressure bar through a dowel, and the other end of the spring is connected on the rectangular block of the turnover seat which is clamped on the linear guide rail and connected with the constant-force leaf spring fixed on the linear guide rail. The probe servo mechanism realizes the automatic inspection for the main bolt of the pressure vessel at the nuclear power station, and the automatic inspection structure is stable and does not swing and the detection signal is stable.

Description

technical field [0001] The invention relates to the non-destructive testing of a primary circuit system of a nuclear power plant, in particular to a follower mechanism of an eddy current testing probe of a nuclear pressure vessel main bolt testing machine. Background technique [0002] The nuclear pressure vessel is a barrel-shaped vessel with a height of nearly 10 meters and a diameter of about 4 meters. It consists of a pressure vessel cylinder, a pressure vessel top cover, and main bolts. There are nearly forty main bolts with a diameter of more than 150 mm and a height of nearly 2 meters. It is used to connect the top cover with the cylinder body of the pressure vessel for tight sealing. The nuclear reactor pressure vessel is the heart of the nuclear power plant. The nuclear fuel reacts in the pressure vessel to generate heat. This equipment is an important equipment of the nuclear power plant. The main bolt is used to seal the high-temperature and high-pressure cooling ...

AI Technical Summary

Problems solved by technology

[0004] The eddy current inspection probe follower mechanism of the main bolt inspection machine for nuclear pressure vessels is a transmission inspection mechanism on the main bolt inspection machine. At present, French Framatome company has developed an automatic inspection device for main bolt inspection, but this technology and equipment belong to the core technology, restricting exports to China, and there is no similar technology and inspection equipment in China

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