Phased-array ultrasonic nondestructive detection fixture of welding rotor

Abstract

The invention belongs to the field of a detection robot, and particularly relates to a phased-array ultrasonic nondestructive detection fixture for a steam turbine welding rotor, which is used for overcoming the weaknesses of the prior art that no positioning and drive device is arranged and the technical problem of defect caused by detecting the welding rotor seam by utilizing the vision and thickness measuring method. A system mainly comprises an adsorption-type movable platform, a positioning system and a driving clamp. The phased-array ultrasonic nondestructive detection fixture has the advantages that a wedged block is automatically adaptive to the surface angle of the welding rotor by virtue of the rotation degree of freedom of the tail end of the clamp and the elastic force of a spring, and the wedged block is tightly fit to the welding rotor; the transverse movement of the wedged block can be realized by virtue of a drive motor and a transmission mechanism, so that the wedged block can be used for detecting different positions on the surface of the welding rotor; the axial positioning between the wedged block and the welding rotor is realized under the effect of the positioning system, so that the wedged block can be accurately aligned to a weld seam.

Description

technical field [0001] The invention belongs to the field of detection robots, in particular to a fixture for phased array ultrasonic non-destructive detection of welding rotors. Background technique [0002] The rotor is the core component of the steam turbine, and it has many structural forms, such as integral forged rotors, sleeved rotors, welded rotors and combined rotors. Compared with the steam turbine rotors of conventional thermal power units, the steam turbine rotors of nuclear power plants are large in size and weight, and require high machining accuracy. Generally, welded rotors are used. [0003] In order to ensure the quality of the welded rotor, phased array ultrasonic testing of the weld seam is required during the manufacturing process, after the preparation is completed, and during service. Use different wedges for testing. Especially after the preparation is completed and in service, because the rotor is equipped with blades, the working space becomes ext...

AI Technical Summary

Problems solved by technology

Especially after the preparation is completed and in service, because the rotor is equipped with blades, the working space becomes extremely narrow

[0004] At present, there are already mature fixtures and testing systems for phased array ultrasonic testing, but due to the special circumstances of the welding rotor application, the existing solutions cannot be used on the welding rotor

[0005] For example, the patent application number is 201010248503.2, the application date is August 14, 2010, and the invention patent named "Weld Ultrasonic Inspection and Scanning Device"; and the application number is 201310685223.1, the application date is December 13, 2013, named "Ultrasonic testing device for welded seam of thick-walled pipe". The scanning data is unreliable; secondly, neither of the two schemes has a driving mechanism, so automatic inspection cannot be performed on the workpiece

Based on the above two points, the two schemes cannot be applied to welding rotors

[0006] Another example is that the patent application number is 201210192602.2, and the application date is June 12, 2012. It is an invention patent named "Intelligent Seam Tracking Ultrasonic Inspection Robot and Its Software Analysis System". Ultrasonic testing robots for positioning with ultrasonic probes cannot be identified by visual sensors after the welding seam of the welding rotor is processed, and the thickness of the welding rotor is fixed, so vision and thickness measurement methods cannot be used in the detection of welding rotors. Not suitable for use in welding rotor occasions

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