JPS60164247A - Rotary flaw detecting apparatus - Google Patents

Abstract

PURPOSE:To examine internal flaws and surface flaws with a probe being rotated, by detecting the internal flaws by an ultrasonic wave flaw detecting method through a rotary transformer, converting a part of the internal-flaw detecting ultrasonic waves into an electric signal, performing magnetic flaw detection at the same time, and taking out both signals as the ultrasonic waves. CONSTITUTION:Internal flaws are detected by an ultrasonic wave flaw detecting method through a rotary transformer 8. At the same time, a part of the internal-flaw detecting ultrasonic waves is converted into an electric signal, and a magnetic probe 15 is operated. The magnetic detected-flaw signal is shifted by a time period for the ultrasonic wave flaw detection and converted into ultrasonic waves, which are in turn received by an ultrasonic-wave receiving probe 23 that is used in the ultrasonic flaw detecting method. The received ultrasonic-wave detected-flaw signal and the magnetic detected-flaw signal are modulated by a high frequency signal. The results are taken out through the rotary transformer 8 and demodulated. Then, they are separated into the ultrasonic-wave detected-flaw signal and the magnetic detected-flaw signal by time division, and each flaw is judged. Thus the examination of the inside and the surface of steel pipe and the like can be performed by one operation. The examination can be performed only by passing the material to be examined through the center of a rotary drum. Thus the efficiency of the production line can be enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a flaw detection device that inspects internal flaws and all surface flaws in a steel vibrator while rotating the probe.

[Conventional technology]

Conventionally, non-destructive testing has been carried out during the entire production process of steel vibrators, steel bar materials, etc. in order to fully guarantee the quality of the products. It was being done above. The reason for this is that the ultrasonic flaw detection method uses the reflection of ultrasonic waves from flaws in the test material, so internal flaws can be detected, but large reflected waves of ultrasonic waves are generated on the surface where the ultrasonic waves are incident or near the point of incidence. Therefore, even if there is a scratch, the reflected wave is so large that it cannot be detected. For this reason, ultrasonic flaw detection has been used to inspect the internal parts of materials to be tested. The scented ultrasonic flaw detection method is effective in driving and receiving the probe.
Since air pulses are used, a rotary transformer can be used, and inspections were performed by simply running the test along the entire length of steel pipes or steel rods by rotating a rotary flaw detection drum. Fig. 1 shows the structure of a conventional vibrator flaw detection system that uses a rotating flaw detection drum all around it. (1) is the material to be tested, (2) is the flaw detection drum, (3) is the ultrasonic transmitting probe, and (41 is the ultrasonic receiving probe).

(5) is the drive motor, (6) is the gear of the drive motor (5), (7) is the gear of the rotating flaw detection drum, and (8) is the rotating transformer.

(9) is the rotor of the rotating transformer (8), and aG is the stator of the rotating transformer (8). Next, Km construction will be explained. The opening of the material to be inspected is at the center of the flaw detection drum (2) at full arrow A.
passing in the direction of The rotating flaw detection drum (2) K is embedded with an ultrasonic transmitting probe (3) and an ultrasonic receiving probe (4).
5) rotates in the direction of arrow B via the gear (6) and the carrier (7) of the rotary flaw detection drum (2). Furthermore, the rotor (9) of the rotary transformer (8) is attached to the other end of the rotary drum (2).
) A stator shaft is provided opposite the rotor (91).

Next, the operation will be explained using the block diagram shown in FIG. 2. (2) to (IIK are all the same as in Fig. 1 above. αB is an ultrasonic exciter, α2 is an amplification circuit, a
S is a processing circuit, (14 is a control circuit. The pulse signal generated by the ultrasonic exciter (Ill)
The ultrasonic waves are sent through the excitation primary coil (10-1) of the stator uO (8) to the excitation secondary coil (9-1) of the rotor (9) of the rotary transformer (81) of the rotating flaw detection drum (2). The transmitting probe (3) is fully excited.The ultrasonic wave generated by the ultrasonic transmitting probe (3) inspects the material to be tested (11), reaches the ultrasonic receiving flaw probe (41), and generates an electric pulse. The signal is converted into a signal, passes through the primary receiving coil (9-2) of the rotor (9) of the rotating transformer (8), reaches the secondary receiving coil (10-2), is taken out to the outside, and is amplified by the amplifying circuit α2. Processing circuit a
It is determined by j. The control circuit I controls the operation timing of the ultrasonic exciter aυ and the processing circuit group 3.

On the other hand, magnetic flaw detection applies an external magnetic field from the surface of the material being tested.
If there is a defect in the material to be inspected, leakage magnetic flux is generated from the defective location, so this detection method uses a magnetic probe to detect the leakage magnetic flux, and the external magnetic field passes through the entirety of the material to be inspected. Since the detection is limited to the surface and the vicinity of the surface, the detection of defects in the material to be inspected is also limited to the detection of defects on the surface and in the vicinity of the six times. Furthermore, since the magnetic flaw detection method detects all of the leakage magnetic flux, the received signal of the magnetic probe is also weak, and it is impossible to take the received signal to the outside using a rotating transformer as in the ultrasonic flaw detection method.

Therefore, the ultrasonic flaw detection method that inspects i=1 of the test materials,
Magnetic flaw detection, which inspects the surface and the vicinity of the surface of the test material, was performed independently on a separate line. Therefore.

Similar to the ultrasonic flaw detection method, the magnetic flaw detection method detects flaws on a rotating drum, and the signal is taken externally via a rotating transformer.
1, it was possible to detect both internal defects and surface defects with a single device, and there was a strong demand for simplifying the inspection line and for inspection.

[Summary of the invention]

This invention was made with the aim of completely improving these requirements. At the same time, internal flaw detection is carried out using ultrasonic flaw detection method via a rotating transformer. At the same time, a part of the internal flaw detection ultrasonic waves is converted into electric signals to operate a magnetic probe. The air flaw detection signal is converted into ultrasonic waves after an interval of ultrasonic flaw detection time, and is received by the ultrasonic receiver 4N transducer used in the ultrasonic flaw detection method, and the received ultrasonic flaw detection signals and magnetic flaw detection signals are converted into high frequency signals. The inside of the material to be inspected and This paper proposes a flaw detection device that can inspect for surface flaws.

[Embodiments of the invention]

Figure 3 is a structural diagram showing one embodiment of this invention (!)
. . . are exactly the same as the above-mentioned conventional device.

ae is the magnetic probe on the flaw detection drum (2), ae is the peripheral circuit group of the magnetic probe, and aη is the DC power supply T that supplies power to the peripheral circuit group on the flaw detection drum via the rotary transformer (8). It is a conversion circuit.

Figure 8A4 shows the ultrasonic transmission probe (3) used in this invention.
The detailed structure of the ultrasonic receiving probe (41) is shown.
(2) is a reflector that totally reflects a part of the ultrasonic wave emitted from the ultrasonic transmitting transducer 08, and C1l+ is the 1st part of the ultrasonic wave reflected by the reflector as a '11-m air signal. an ultrasonic receiving transducer; (2) is a sub-transmitting ultrasonic transducer attached to the ultrasonic receiving probe (4) that converts the flaw detection signal obtained from the magnetic probe αj into ultrasonic waves;
(C) holds a 4-channel transducer for ultrasonic reception, and (Foundation) holds a transducer (C) for ultrasonic reception and an ultrasonic transducer Q2 for sub-transmission.

This is a holder that transmits the ultrasonic signal for detection and flaws to the entire ultrasonic reception transducer.

FIG. 5 is a block diagram for explaining the invention in detail. (2) to αJ are the same as those shown in Fig. 2 above, (141 to αS are the same as shown in Fig. 3, and 08 to (2) are exactly the same as those shown in Fig. 4 above. Here, the peripheral circuit group QB is the following circuit. (c) is a detector, (c) is a high frequency filter, (c) is a delay circuit, (to) is a high frequency modulation circuit, and the wire is a demodulation circuit. (2) is a separation circuit, and C ( υ is a high frequency power supply.

Next, the operation will be explained. The pulse signal from the ultrasonic exciter αB is transmitted through all valves of the rotating transformer (8) to the flaw detection drum (2).
)'s ultrasonic transmitting probe (3)'s ultrasonic transmitting transducer 0
Test material (1) that generates ultrasonic sound for internal flaw detection with full excitation for seconds
The inside of the probe is detected for flaws and received as an ultrasonic flaw detection signal by the ultrasonic receiving transducer (c) of the ultrasonic receiving transducer (41). A part of the ultrasonic wave emitted by the four-element Nishiki is extracted as an electrical signal by the sub-ultrasonic receiving transducer QD and rectified by the detector (c) in the peripheral circuit group of the magnetic probe (61). It becomes a DC power supply and operates the magnetic probe tts+2.The magnetic flaw detection signal α9 detects the leakage magnetic flux due to the surface defect of the material to be inspected (11), and becomes a signal including magnetic flaw detection, and the circuit group ue of the magnetic probe
is added to the high frequency filter (e). The high frequency filter (to) creates a high frequency signal from the signal and adds it to the delay circuit @. The delay time of the delay circuit is set to be longer than the ultrasonic flaw detection time during which the ultrasonic waves emitted from the sonic wave transmitting transducer 0 ladder reach the bottom of the test material (1) and reach the ultrasonic receiving transducer. I'll keep it. The output signal of the delay circuit (5) excites the sub-ultrasonic transmitting transducer t2a'i, becomes an ultrasonic signal, and reaches the ultrasonic receiving transducer (c) following the ultrasonic flaw detection signal. The flaw detection signal that reaches the ultrasonic receiving transducer (c) is converted into an electric signal, modulated at high frequency by the high frequency modulation circuit (c), and taken out to the outside via the single rotation transformer (8) and added to the amplifier 03. The signal is amplified and applied to the demodulation circuit, where it is restored to the flaw detection signal before modulation and applied to the separation circuit. In the separation circuit, the signal is separated into an ultrasonic flaw detection signal and a magnetic flaw detection signal according to a timing instruction from the control circuit, and the signals are sent to a processing circuit Q31VC to determine the presence or absence of internal flaws and surface flaws in the material to be inspected.

In the present invention, the flaw detection drum is driven by a drive motor via a carrier, but it may also be driven by a pulley attached or by a belt.

〔Effect of the invention〕

According to this invention, conventional inspections of steel vibrators and steel bar materials, etc., which were conducted separately for the inside and surface, can be integrated into one inspection by using this invention, and the entire rotating flaw detection drum can be used. Inspection can be carried out by simply placing the material to be inspected in the center of the rotating drum.

This has the advantage of greatly increasing the efficiency of the production line.

[Brief explanation of the drawing]

Figure 1 shows the conventional ultrasonic flaw detection structure, and Figure 2 shows the conventional operation. FIG. 3 is a structural diagram showing an embodiment of the present invention; FIG. 4 is a detailed structural diagram showing an example of the probe of the present invention; FIG. 5 is a block diagram showing a detailed explanation of the present invention. 1 In the figure, (8) is a rotating transformer, and o9 is a magnetic probe. 0 is a transducer for ultrasonic transmission, a is a holder, 01 is a reflector, (2) 6 is a transducer for sub-ultrasonic transmission, (c) is a transducer for ultrasonic reception, QD is a sub-ultrasonic reception For the camera, @ is a detector, ＼ is a high frequency filter, ＠ is a delay circuit, ＼ is a modulation circuit, ＠ is a demodulation circuit, and OL is a separation circuit. In addition, the same or equivalent parts in FIG. 1 are indicated by the same reference numerals. Agent Masuo Oiwa Figure 1 Figure 3 vs Figure S4 tt y

Claims (1)

[Scope of Claims] An ultrasonic wave transmitting vibrator for ultrasonic flaw detection that transmits ultrasonic waves on a one-rotation flaw detection drum in a rotary flaw detection device that performs flaw detection on a test material, and a transmitter of this ultrasonic wave transmitting vibrator. With a holder that transmits ultrasonic waves to all the tested materials. an ultrasonic receiving transducer that receives reflected signals detected by ultrasonic waves emitted from the holder C; a reflecting plate provided in a part of the holder that reflects the ultrasonic waves; and an ultrasonic wave reflected by the reflecting plate. It is operated by a sub-super back wave receiving camera element which takes out waves as electrical signals, a detector which converts the signal sound from this sub-ultrasonic transducer into a DC signal, and a DC power source generated by this detector. A Sanno high frequency filter that generates a high frequency signal from the signal obtained from this magnetic probe, a delay circuit that delays the signal obtained from this high frequency filter by the ultrasonic flaw detection time, and a delay circuit that delays the signal obtained from this high frequency filter by the ultrasonic flaw detection time. A sub-ultrasonic transmitting transducer which converts the signal wave into an ultrasonic wave and sends it to the ultrasonic receiving transducer, and a probe obtained from the ultrasonic receiving transducer! A modulation circuit that performs high frequency modulation on the signal, a rotating transformer that outputs the high frequency signal obtained from this modulation circuit to the outside, and a flaw detection signal from the high frequency modulation signal obtained from this rotating transformer. A rotary marking machine characterized by comprising a T-demodulation circuit and a circuit for separating the flaw detection signal obtained from the demodulation circuit into an ultrasonic flaw detection signal and a magnetic flaw detection signal.