JPS5871451A - Setting device for sensitivity for magnetic flaw detector - Google Patents

Abstract

PURPOSE:To enable the efficient setting of the flaw detection sensitivity in a short time by a method wherein a truck carrying a magnetic flaw detector is made movable along rails between a flaw detection line and a sensitivity setting line provided in a separate position therefrom. CONSTITUTION:When it is necessary to change the size of a material to be inspected, first a flaw detecting device with a truck on a flaw detection line D is transferred along rails 11 and positioned on a sensitivity setting line A. Next, a test pipe 10 is inserted into a magnetization coil 4 of the flaw detecting device, and a detector 5 is adjusted so that it is matched with the diameter of the test pipe 10. Thereafter, the test pipe 10 is moved forward and backward by a rod 20 to transfer an artificial flaw 6 onto the detector 5, and thereby the setting of sensitivity is performed. When the setting of the sensitivity of one detector 5 is completed, the test pipe 10 is rotated, and thus the setting of the sensitivity of subsequent detectors 5 is performed sequentially. After the setting of sensitivity is all completed, the flaw detecting device is returned onto the flaw detection line D to perform the flaw detection of the material to be inspected.

Description

[Detailed description of the invention] The present invention relates to a sensitivity setting device for a magnetic flaw detector.

One of the methods for non-destructively inspecting the inner and outer surfaces of steel rods, such as steel pipes, is the magnetic flaw detection method, which magnetizes a copper pipe and detects leakage magnetic flux from a defective part to estimate the position, size, etc. of the defect. FIG. 1 is a schematic diagram of a magnetic flaw detector using the above flaw detection method. A plurality of V rolls 2 and a magnetic flaw detector 9 are arranged between them on the flaw detection line, and the copper tube 1 to be tested is held down by the V rolls 2 and, in some cases, by the pinch rolls 3, while magnetizing the flaw detector 9. When the steel pipe 1 passes through the detector 5, the leakage magnetic flux generated from the defective portion is detected by the detector 5. This conventional example is of a detector fixed arrangement type, and as shown in FIG. 2, eight detectors 5 are arranged at 45-degree intervals on the turn of the steel pipe 1. The magnitude of the obtained signal is determined by the magnitude of the steel pipe 1 passing through the detector 5.
Let V be the sieve voltage that changes depending on the speed of Ba1
, is expressed as . In this case, if the outer diameter, wall thickness, and material of the steel pipe change, the leakage magnetic flux φ will change even with the same magnetizing current, so it is necessary to set the sensitivity. Conventionally, in this divine magnetic flaw detector, the sensitivity setting was performed by drilling an artificial defect 6 in a sensitivity setting test material (Test 9 Iso) l of the same shape and material, and using this test no J? Eve 1 is passed through the flaw detection line and is run at a predetermined conveyance yv by V roll 2. That is, the same detector 5 detects the leakage magnetic flux generated in the artificial defect 6 whose shape and size are known, and the sensitivity is adjusted. This method has the following problems.

(b) When performing flaw detection on the next test material steel pipe with a different outer diameter, it is necessary to send the test pipe to the magnetic flaw detector using the same flaw detection line, that is, online using a V-roll, and set the sensitivity. Operation time is restricted and work efficiency is reduced; lower blade; length is 5 to 6.
1゜ (b) Test pipes that require a length of 4 m or more must be prepared for each outer diameter, wall thickness, and material of the test material, with the same length as the test material. Not,
Because of this many long tests IJ? Space is required to store the eve at all times.

(c) Sensitivity must be set for all detectors in the test pipe 10 times, but in the case of 8 detectors arranged at 45 degree intervals as shown in Figure 2, once the sensitivity setting for one detector is completed, the sensitivity must be set by 45 degrees. This will be done 8 times. Due to the structure of the V-roll, it is difficult to stop the test pipe mid-way and return it to its original position, so in the end, the entire length of the test pipe must be repeated more than 8 times, and it takes a long time to set the sensitivity. .

(d) With conventional devices, the power required to set the sensitivity is not trivial. As can be seen from the above-mentioned relational expression for the induced voltage V, the magnitude of the signal obtained even for the same defect changes depending on the speed at which the defect passes through the detector and the magnitude of leakage magnetic flux. When setting the sensitivity, the magnitude of the leakage magnetic flux is determined by regulating the magnetization strength of the material and the shape and dimensions of the artificial defect. However, regarding the speed, a long test is conducted to ensure that the conditions do not change between the sensitivity setting and flaw detection. The pipe must be run at the same high speed as the material being tested. Therefore, it requires as much power as during flaw detection.

As described above, the sensitivity settings of conventional magnetic flaw detectors have had many problems in terms of work efficiency and energy conservation.

SUMMARY OF THE INVENTION An object of the present invention is to provide a sensitivity setting device for a magnetic flaw detector, which solves the above-mentioned problems and allows flaw detection sensitivity to be set efficiently in a short time.

For this purpose, the present invention provides a sensitivity setting line that is provided separately from the flaw detection line and is equipped with a support roller that can change the height position of the test material for sensitivity setting, and a vertical position adjustment equipped with a magnetic flaw detector. A trolley, a trolley running rail installed between the flaw detection line and the sensitivity setting line, a device for reciprocating the test piece in the axial direction on the sensitivity setting line, and a carcass test material at a predetermined angle. It was decided to provide a rotating device.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 3 is a plan view of the sensitivity setting device according to the present invention, and FIG. 4 is a side view thereof. As explained in FIG. Df) Can be carried out to the side. In this example, the sensitivity setting line A is parallel to the flaw detection line D.
is provided.

A pair of rails 11 are provided from the flaw detection line D to the sensitivity setting line A, and are perpendicular to the two ins, and a cart 12 carrying a flaw detector moves on these rails.

The trolley 12 has a lifting device 13, on which the main body of the flaw detector is placed. 14 is a wheel of the truck 12.

A pair of roller support stands 16 are arranged on the sensitivity setting line A with a pair of rails in between, and a V roller 15 supporting a test via 'lO is pivotally supported on this support stand 16. V
The position of the roller 15 can be adjusted in the vertical direction by means of a gloss 17. Also disposed on the sensitivity setting line are a reciprocating drive device B that reciprocates the test tube 10 in the axial direction, and a rotation drive device C that rotates the test via 10 intermittently by a predetermined angle.

In the reciprocating drive device B, the piston 19 and the piston rod 2o connected thereto reciprocate in the axial direction using the cylinder 18 installed on the cylinder support base 26 as a guide, and thereby the piston rod 2o connected to the tip of the rod A? eve 1
0 is moved back and forth on the V row 215. A pair of striped rockets 23 and an endless carrier 22 hung thereon are arranged below the cylinder 18. A dog 21 is fixed to the carrier 22. As shown in FIGS. 5 and 6, the dog 21 engages the piston 19 within the cylinder through an axially extending notch 35 in the underside of the cylinder 18. As shown in FIGS.

24 is a support base for the striped rocket 23, and 25 is a motor for rotating the striped rocket 23.

As shown in FIG. 7, the rotational drive device C includes a worm 3o attached to the rear end of the piston rod 2o via a key 34.
, a worm gear 31 that meshes with the worm 3o, and a Norsmo-132 roller that rotates the worm gear 31.
Ru. 33 f4, /+ This is a coupling ring that connects the output shaft of the rotor 32 and the worm gear 31.

A connector 27 that is divided into two limbs is fixed to the tip of the rod 20, and a knuckle 28 that fits into the connector is formed at the end of the terminal 9 and 1o. The connector 27 and the knuckle 28 are connected to each other via the fixing pin 29. Next, the main F! The operation of the AK device will be explained.

First, when it is necessary to change the size, the flaw detection device with a trolley on the flaw detection line D is pulled in using the rail 11 and positioned at the off-line sensitivity setting line. Next, the test pie f1o is passed through the magnetizing coil 4 using the roller 15, and the connector 27 attached to the tip of the rod 2o and the knuckle 28 attached to the tip of the test/four hook 10 are connected.
are connected with an identification pin 29. At this time, the test/mother Iso 1o is installed while adjusting the height of the flaw detection device and the height of the roller 15 using the lifting device 13 and the jack 17. Next, the detector 5 is adjusted to match the diameter of the test vibe 1o.

Now that the preparation is complete, you can start setting the sensitivity.

To rotate the motor 25 in forward and reverse directions, the carrier 22
is rotated forward and backward at high speed, and the rod 2o is moved back and forth at high speed through the dog 21 and the piston 19. Due to this movement, the test piezo 10 moves back and forth on the roller 15, and the artificial defect 6 of the test/4 sensor 10 moves on the detector 5.) Sensitivity settings are performed. When the sensitivity setting of one detector 5 is completed, the mounting angle of the detector 5 is changed, for example, by rotating the rod 20 by 45 degrees by the base motor 32, the test pipe IO is rotated, and the next detection is performed. Child 5
Set the sensitivity. In this case, the rod 20 is moved at an angle i! &
The rotational movement for adjusting the piston 19b is performed by rotating the piston 19b in a sliding motion on the dog 21.

By repeating the above operations, sensitivity setting can be completed in a short time. After setting the sensitivity, the flaw detector is returned to the flaw detection line and the test material is inspected.

In the present invention, the rail is extended to both sides of the flaw detection line,
Two magnetic flaw detectors are prepared, and while the flaw detector on the flaw detection line is in operation, the sensitivity of the other flaw detector can be set for the next test material of a new size, and the next test material is transported. If the flaw detector on the flaw detection line is moved to the rail on the opposite side of the sensitivity setting line and the flaw detector with the sensitivity set is moved to the flaw detection line and the flaw detection operation is performed, work efficiency will be further improved.

Test/4 Since the sensitivity is set by moving the igu back and forth, there is no need for a long object like the actual material to be tested. Although the above embodiment shows an example in which the flaw detection line and the sensitivity setting line are arranged in parallel, the present invention is not limited to this embodiment, and the sensitivity setting line can be arranged according to the space in the factory. Various embodiments may be adopted, such as arranging the cursor diagonally.

The reciprocating and rotating mechanism of the test vibrator is also not limited to that of the illustrated embodiment.

[Brief explanation of drawings]

Figure 1 is a schematic side view of the magnetic flaw detector, Figure 2 is a front view showing an example of the arrangement of detectors in the magnetic flaw detector,
#c3 is a plan view of the sensitivity setting device according to the embodiment of the present invention, FIG. 4 is a side view of FIG. 3, FIG. 5 is a perspective view of the cylinder of the reciprocating drive device, and Figure 6 is the ■ of Figure 5.
-vI11iiI, FIG. 7 is a diagram schematically showing the rotary drive device. 4... Magnetizing coil, 5... Detector, 6...
Artificial defect, lO...Test/Quig, 11
...Rail 12...Bolly, 15...V
Roller, 18... Cylinder, 20... Piston rod, 22°°° Carrier, 23... Stripe rocket, 25... Motor, 30... Worm,
31... Worm gear, 32... Noise motor, 4A... Sensitivity setting line, B... Reciprocating drive device, C... Rotating drive device, 1)... Scratching line. Agent: Toshikichi Somekawa Figure 1 So Figure 2 et al Figure 3 Figure 4 M: L-■ 71st Go

Claims (1)

[Claims] A sensitivity setting line equipped with a support roller that is installed at a different position from the flaw detection line and that can change the height position of the sensitivity setting test material, and a cart equipped with a magnetic flaw detector whose vertical position can be adjusted.
A trolley running rail installed between the flaw detection 2-in and the sensitivity setting line, a device for reciprocating the test material in the axial direction on the sensitivity setting line, and a device for rotating the test material by a predetermined angle. A sensitivity setting device for a magnetic flaw detector, comprising: