Device for non-destructive testing of rolled steel plate and the like

A device for the non-destructive testing of rolled steel plate and the like for the presence of internal flaws or defects, such as non-metallic inclusions, inhomogeneities and the like, comprising a carriage adapted to be traversed in relation to the surface of the plate to be tested and parallel thereto, and said carriage having attached thereto, through the medium of connecting links, at least one ultrasonic test head including an ultrasonic transmitter and an ultrasonic receiver supported by a test head holder and adapted to be tilted about two mutually perpendicular tilting axes extending substantially parallel to the surface of the plate to be tested, the said connecting links comprising a number of elevating means the number of which corresponds to the number of test head holders present, each said elevating means cooperating with one of said test head holders, said elevating means being adapted individually to raise and lower said test head holders at right angles to said plate surface, characterized in that said connecting links associated with each test head holder comprise both an elevating cylinder and a separate guide means adapted positively to guide said test head holder in a direction extending at right angles to the raising and lowering direction, and that said elevating cylinder and said guide means are coupled to said test holder through the medium of pivotal joints having a common rotational axis constituting one of said two tilting axes of said test head holder, and in that said connecting links comprise a supporting arm coupled to said carriage, extending substantially parallel to said plate surface and adapted to be pivoted about a pivot axis extending substantially perpendicular to said plate surface, a plurality of said test head holders being coupled to said supporting arm through the medium of one elevating cylinder and one guide means.

A device for the non-destructive testing of rolled steel plate and the like for the presence of internal flaws or defects, such as non-metallic inclusions, inhomogeneities and the like, comprising a carriage adapted to be traversed in relation to the surface of the plate to be tested and parallel thereto, said carriage having attached thereto, through the medium of connecting links, at least one ultrasonic test head including an ultrasonic transmitter and an ultrasonic receiver supported by a test head holder and adapted to be tilted about two mutually perpendicular tilting axes extending substantially parallel to the surface of the plate to be tested, the said connecting links comprising a number of elevating means the number of which corresponds to the number of test head holders present, each said elevating means cooperating with one of said test head holders, said elevating means being adapted individually to raise and lower said test head holders at right angles to said plate surface, characterized in that said connecting links associated with each test head holder comprise both an elevating cylinder and a separate guide means adapted positively to guide said test head holder in a direction extending at right angles to the raising and lowering direction, and that said elevating cylinder and said guide means are coupled to said test head holder through the medium of pivotal joints having a common rotational axis constituting one of said two tilting axes of said test holder, in that each test head comprises at least one test probe, each test probe having an ultrasonic transmitter and an ultrasonic receiver adjustably mounted within a probe holder, and in that each test probe is urged against an internal surface of an annular flange formed on a cylindrical socket which socket is in screw-threaded engagement with said probe holder through the medium of spring bearing with one end thereof against an upper end face of said probe holder and with the other end thereof against an annular projection formed on the upper end of said probe, and that each test probe is adapted to be axially displaced within the probe holder by screwing said socket in relation to said probe holder.