JPS599858B2 - Rotating non-destructive testing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotating non-destructive testing apparatus that includes at least one non-destructive testing member arranged to rotate around an object under test, such as a steel pipe.

In such a device, a record card or sheet is optionally required regarding the test record regarding the object under test and/or the location of damage points in the object under test detected by said test member.

The object of the invention is to obtain a non-destructive testing device in which the radial position of detected damage is clearly indicated. According to the present invention, a nondestructive test member is rotatably mounted around an object to be tested, a rotation device for rotating the test member, and a plurality of excitation members rotatably associated with the rotation device. and the excitation members are arranged in a sequential and periodic manner so that upon rotation of the test member, a stationary detection device located near the excitation members is excited. be done.

The excitation members may be associated with any suitable part of the rotation apparatus of the test member, for example they may be supported by the rotor of a drive motor, or the drive may be provided by a timing belt or chain. If carried out, they may be supported by this belt or chain. However, it is also advantageous if these excitation members are supported by a rotary member on which the test member is mounted, which rotary member is rotatable on an annular fixed member arranged to pass through the object under test. mounted on.

The excitation member may be a stud made of ferromagnetic material provided on the outer surface of an annular rotating member arranged to rotate around the object to be tested.

In this case, the detection device may be configured as an eddy current detection device provided close to the rotation path of these ferromagnetic studs. This detection device further includes a primary coil and a secondary coil, and the leakage magnetic flux between these coils is disturbed to a detectable extent every time the stud on the rotating member passes near the detection device. It may be of the type that is used. In one embodiment of the invention, 200 studs are evenly spaced around the rotary attachment and in a single radial plane.

Furthermore, a stud is disposed on the annular member in a different radial plane and is associated with a separate sensing device. With such an arrangement, the radial position of the rotary member relative to the reference position indicated by the one stud can always be determined to within 1/200 of the circumference of the rotary member. When an object to be tested (e.g. a steel pipe) is fed through this testing device without being rotated as in the normal case, the location of the flaw detected by the test probe will be located around the pipe in the same way as above. around the tube with an error of l/200.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

The embodiment according to the invention shown in the figures comprises an annular stationary member 1, on which an annular rotor 2 is provided so as to be able to rotate around the member 1.

A geared wheel 3 is provided at one end of the rotor 2 and engages a timing belt (not shown) which is drivingly coupled to an electric motor (not shown). An ultrasonic test probe assembly 4 is supported by a plate 5 attached to one end of the rotor 2.

Each of these assemblies 4 includes a plurality of ultrasonic pulse generation probes electrically coupled to a plurality of sliding wheels 6 embedded in the rotor 2, and the operation of these probes is controlled by the sliding wheels 6 and the plurality of ultrasonic pulse generating probes. It is controllable from an external electrical circuit (not shown) through an engaging brush (not shown). The rotor 2 is made of a thermosetting synthetic resin such as Araldite (trade name), and has 200 mild steel stud bolts 8 at an end 7 opposite to one end where the plate 5 is provided. They are embedded in the third trochanter at equal intervals.

The outer surface of these studs is coated with varnish or lacquer to prevent rust and is flush with the outer surface of the rotor. Furthermore, a similar stud 9 is provided on one side of them, but out of the radial plane of the stud 8. Two eddy current detection probes 10 and 11 are provided near the end 7 of the rotor 2 and cooperate with the stud group 8 and a stud 9, respectively.

In operation of the device, the steel pipe 12 to be tested is fed through the stator 1 and the rotor 2 without rotation.

At the same time, the rotor 2 is driven to bring the probe assembly 4 into contact with the steel pipe 12 and to bring the probe assembly 4 into contact with the steel pipe 12.
2, thereby performing a continuous helical scan test from one end of the steel tube 12 to the other. The rotation of the rotor 2 causes the studs 8 and 9 to pass near the detection probes 10 and 11, respectively;
This change in magnetic flux in the sensing probes causes output signals to be generated from these probes.

Probe 11 generates one output signal per rotor revolution, while probe 10 generates 200 output signals per rotor revolution. Thus, the test probe assembly 4
In appropriate cooperation with the operating circuit, the radial positions of damages or defects in the object under test are determined and recorded by means of known recording devices.

[Brief explanation of drawings]

The figure is a partially cutaway side view of a rotating non-destructive testing device according to the present invention. 1... Fixed member, 2... Rotating member, 3
... Geared ring, 4 ... Ultrasonic test probe assembly, 5 ... Plate, 6 ... Sliding wheel, 8, 9 ...・・Built bolt, 10, 11・・・・
...Eddy current detection probe, 12... Steel pipe to be tested.

Claims (1)

[Claims] 1. A member for non-destructive testing, a rotating member to which the testing member is attached, and a rotating member that allows the object to be tested to pass through it, and that allows the rotating member to be mounted and rotated around the object. an annular stationary member, a device for rotating the rotary member, a plurality of excitation members supported by the rotary member, and a stationary detection device located near a path of motion of the excitation members, the excitation members being arranged in sequence. a rotating non-destructive testing device arranged periodically and periodically to excite the stationary sensing device upon rotation of the rotating member;