JPS5842943Y2 - Eddy current flaw detection equipment - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an eddy current flaw detection device that improves inspection speed and accuracy.

Recently, in order to inspect small forged products with circular cross sections such as bolts and pins, instead of conventional visual inspection or magnetic particle inspection,
Eddy current flaw detection has become widely used because it is relatively immune to individual differences and inspection speed can be improved through automation.

These nine types of eddy current flaw detection devices are usually
As shown in the longitudinal sectional front view of the figure, the device is designed to rotate the inspection object 1 facing the flaw detection probe 2 in the circumferential direction to detect the presence or absence of defects over the entire outer circumference. In order to hold and rotate the inspection object 1 from the rolls 3a to 3dK, driving operations of the air cylinders 4a to 4d to move the rotary rolls forward and backward to set them, or driving operations of the air cylinder 5 to move the flaw detection probe 2 back and forth, etc. The disadvantage is that it takes a long time to handle the object to be inspected, and the time consumed by such handling becomes a bottleneck, making it impossible to improve the inspection speed.

Furthermore, the above-mentioned conventional apparatus has the problem that the magnetic saturation of the object to be inspected, which is necessary to improve the inspection accuracy, cannot be obtained unless the more complicated magnetic saturation equipment for the object to be inspected is separately upgraded.

Therefore, even if the manufacturing process of this type of forged product is streamlined and the manufacturing speed increases, the inspection speed will not increase commensurately, so one manufacturing machine must be equipped with multiple eddy current flaw detection devices. However, there has been a desire to develop an eddy current flaw detection device that can easily improve efficiency.

In response to the above-mentioned demands, the present invention aims to improve the inspection speed and accuracy by eddy current flaw detection. The present invention provides an eddy current flaw detection device comprising a flaw detection probe that is provided so as to rotate along the outer periphery of the flaw detection probe while facing the flaw detection probe.

The present invention will be explained in detail below based on the drawings listed as examples.

FIG. 3 is a longitudinal sectional front view showing the mechanism of one example of the device of the present invention.

In the figure, reference numeral 6 denotes an electromagnetic device, which is attached to the lower end of a support rod 9 suspended on a pedestal 8 on the transport line T, with its center aligned with the central axis of the support rod, and the object to be inspected is placed on the lower surface of the electromagnet device. The conveyor line 7 is also configured to be vertically attached and detached.

Reference numeral 10 denotes a coil of the electromagnetic device, which is connected to a power source (not shown) by a wiring 11 passing through the support rod 9.

Reference numeral 12 denotes a probe holding tube that is provided concentrically surrounding the support rod 9 at an appropriate interval, the lower part of which is enlarged in diameter, and the flaw detection probe 2 is attracted to the electromagnet at an appropriate position on the inner surface of the enlarged diameter portion 13. It is attached facing the outer periphery of the inspected object 1.

The probe holding tube 12 is rotatably attached to the supporting rod 9 with a bearing mechanism 14 interposed between the probe holding tube 12 and the supporting rod 9, and the probe holding rod 12 during rotation is attached to the outer periphery of the supporting rod 9. A slip ring 15 attached to the pedestal 8 is slidably contacted to prevent eccentricity.

Reference numeral 16 denotes an electric motor for rotating the probe holding tube 12, which is installed on the pedestal 8, and a gear mechanism 17 is interposed between it and the globe holding tube 12 to transmit the rotation of the motor to the probe holding tube.

18 is a contact ring wound around the outer periphery of the probe holding tube 12 via an insulator 19, and the flaw detection glove 2 and the eddy current flaw detection device 23 are connected to a wiring 20 that passes through the inside of the glove holding tube and reaches the contact ring 18, and a The provided contact brush 21 is connected to the contact ring 18.
The wiring 22 that contacts the side surface of the eddy current flaw detection device 23
The flaw detection probe 2 is electrically connected to the eddy current flaw detection device, and the signal obtained by eddy current flaw detection of the object 1 to be inspected by the flaw detection probe 2 is sent to the eddy current flaw detection device.
It is configured to perform the required analysis and perform eddy current testing.

FIG. 4 is a plan view showing an example of an eddy current inspection line incorporating the device of the present invention.

In the figure, 24 is an air cylinder that sends the inspected object 1 on the transport line 7 directly below the globe holding tube 13, 25 is an air cylinder that sends the inspected object 1 directly under the probe holding tube after inspection to the sorting line 26, and 28 is a sorting line. If the inspection object 1 that has arrived at the sorting machine 2T on the line 26 is defective, it is an air cylinder for discharging it from the sorting line 26 to the defective product line 29.

The device of the present invention operates as follows.

(2) The object to be inspected on the transport line γ is sent directly below the glove holding tube 13 using the air cylinder 24.

■ Power is supplied to the electromagnet device 6, and the inspected object 1 is transferred to the transport line 7.
At the same time, the object 1 to be inspected is magnetically saturated.

■ While the probe holding tube 12 is rotated once by the drive of the electric motor 16, the flaw detection probe 2 performs eddy current flaw detection over the entire outer circumference of the object 1 to be inspected, and the signal is analyzed by the eddy current flaw detection device 23 to detect defects in the object to be inspected. If there is, a reject signal is output from the eddy current flaw detection device to the air cylinder 28.

(2) Immediately after the above inspection is completed, the power supply to the electromagnet is stopped, the inspected object 1 is removed from the electromagnet and returned to the carry-in line, and the air cylinder 25 is activated to send the inspected object to the sorting line 26.

■ The next object to be inspected is sent out onto the conveying line by the air cylinder 24 and the operations described in (1) to (3) are performed, and if the previous object to be inspected 1 sent to the sorting line 26 has a defect, a reject signal is sent as described above. The air cylinder 28 that receives the inspection object 1 is activated, and the inspected object 1 is sent to the defective product line 29 side in the sorting machine 27 and removed from the sorting line 26.

The present invention has the above-mentioned structure and operation, and by making the flaw detection probe continuously rotated by an electric motor, the time required for the start-up of rotation is eliminated and the rotation speed can be adjusted as required, thereby speeding up the production of the test object. When the inspection speed is improved, the inspection speed can be easily improved, and since the object to be inspected is magnetically saturated by the electromagnet, the inspection accuracy can be improved.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an example of a conventional eddy current inspection line, Fig. 2 is a longitudinal sectional front view taken along the line A-A in Fig. 1, Fig. 3 is a longitudinal sectional front view illustrating the mechanism of the device of the present invention, and Fig. 4 is a longitudinal sectional front view showing an example of a conventional eddy current inspection line. The figure is a plan view showing an example of an eddy current inspection line incorporating the device of the present invention. 1: Inspection object, 2: Flaw detection glove, 3: Rotating roll, 4
．． 5.24.25.28: Air cylinder, 6: Electromagnet device, 7: Conveyance line, 8: Frame, 9: Support rod, 10: Coil, 11.20.22: Wiring, 12 Nibrobe holding tube, 13 Nibrobe Holding tube enlarged diameter part, 14: Bearing mechanism, 15 Nissuri spring, 16: Electric motor, 17: Gear mechanism, 18: Contact ring, 19: Insulator, 21: Contact brush,
23: Eddy current flaw detector, 26: Sorting line, 29: Defective product line.

Claims (1)

[Scope of utility model registration request] The object to be inspected 1 is suspended on the transport line 7 and
An electromagnet device 6 is provided to be vertically attached to and removed from the electromagnetic device, and a flaw detection probe 2 is provided to rotate along the outer periphery of the object to be inspected 1 while facing the object to be inspected 1 around the central axis of the electromagnet device.
An eddy current flaw detection device characterized by comprising: