Ultrasonic testing device for king bolt of reactor pressure vessel of nuclear power station

Abstract

The invention provides an ultrasonic testing device for a king bolt of a reactor pressure vessel of a nuclear power station. The ultrasonic testing device comprises a base, a vertical frame fixed on the base, a support platform, a holding mechanism and a testing mechanism, wherein the support platform is arranged on the base by a rotating mechanism and is used for supporting the king bolt and driving the king bolt to rotate; the holding mechanism comprises a first mounting base and a holding claw which is arranged on the first mounting base and surrounds the king bolt, and the first mounting base is arranged on the vertical frame and is positioned on one side facing the support platform; the testing mechanism comprises a second mounting base, a transverse driving mechanism, a longitudinal driving mechanism, a first clamp with a center hole inner wall testing probe and a second clamp with an end surface testing probe, the transverse driving mechanism and the longitudinal driving mechanism are arranged on the second mounting base, the second mounting base is arranged on the vertical frame and is positioned above the holding mechanism. The ultrasonic testing device can realize rapid installation, clamping and centering of king bolts with different models and drive the tested king bolt to rotate stably and accurately, and is provided with an ultrasonic testing probe to achieve gross-volume ultrasonic testing of the tested king bolt.

Description

technical field [0001] The invention relates to an ultrasonic automatic detection system for nuclear power plant reactor main bolts, in particular to an ultrasonic detection device for nuclear power plant reactor pressure vessel main bolts. Background technique [0002] The main bolt of the reactor pressure vessel is the fastener between the reactor pressure vessel body and the top cover. It is easy to cause fatigue damage when working in a high-temperature and high-pressure irradiation environment for a long time. It is an important stressed and vulnerable part in the reactor pressure vessel. In order to ensure the safe and reliable operation of nuclear power plants, the main bolts of the reactor pressure vessel need to be strictly inspected during the manufacturing process of the main bolts or during the refueling maintenance of the power plant. The key inspection object of the service inspection (periodic inspection), the full volume ultrasonic inspection of the main bolt...

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Problems solved by technology

[0006] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide an ultrasonic testing device for the main bolts of the reactor pressure vessel of a nuclear power plant, which is used to solve the problem of unstable positioning of the main bolts in the prior art, which easily produces radial runout and large measurement errors. The problem

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