JPS5819539A - Probe supporting mechanism - Google Patents

Abstract

PURPOSE:To make it possible to securely support a probe at the standby state while it is elastically supported at the flaw detection stage by combining a support mechanism with an elastic reducibility and a mechanism for imparting a preelastic distortion. CONSTITUTION:A boat 10 containing a probe is separated from material 1. A support mechanism 11 with a proper reducibility for elastically supporting the boat 10, which is given a specified amount of preelastic distortion with a predistortion setting device 12, presses the boat 10 against the predistortion setting device 2 by a force according to the predistortion. On the other hand, at the flaw detection, the entire probe supporting mechanism is pressed against the material 1 to be inspeted with a support base 20 while the boat 10 is released from contact with the predistortion setting device 12. The boat 10 is supported so elastically with the support mechanism 11 with a proper reducibility to freely follow the positional displacement of the material 1 being inspected. This precludes the generation of oscillatory motion due to centrifugal force and mechanical vibration thereby enabling longer life of parts of the elastic support bodies.

Description

[Detailed Description of the Invention] ζO threat - Hiro, for example, a mirror-type micro-drying machine O, to be examined! ! #-
! As it reaches the position II, the bare metal probe is held at the standby value t, and the probe M is inspected at the position where the p% material to be inspected can be eaten! 1 material O sketch to be inspected
For example, steel pipe O-
〉, uneven expansion is unavoidable, so it is necessary to install a strong straightening machine before and after the flaw detector, or to install the entire flaw detector with the core of the steel pipe g/! The center of the flaw detector and the core of the steel pipe, which is the material to be inspected, will not coincide unless However, if the material to be inspected has a cylindrical shape at 41, as shown in FIG. It is necessary to follow the angular displacement in addition to the radial) displacement -h), the bending of the steel pipe) amount 1
At G-, the field threat ζO angular displacement outside @100- becomes more than 11IIL.

As above, El! The support mechanism of the probe cannot expand because it cannot make the probe follow the three-dimensional roofing material to be inspected at about 04 degrees, but in order to have high tracking response, it is possible to use an elastic support mechanism. It is being done. For example, 4I Patent Publication No. 11284/1984 has been published as this elastic support mechanism, but this mechanism only takes into account the state in which only the material to be inspected moves, and when the probe rotates, There is a problem in that the probe vibrates during standby due to centrifugal force generated in the probe and parts, mechanical vibration due to rotation, etc. On the other hand, Special Public II S5-22'1
4S4#f/C can be seen in the rotation, rotation and rotation.

Due to the follow-up mechanism based on the parent assembly, the mass of the movable parts is large, the vibration response to the surface displacement of the inspected material is poor, and in addition to the need for a large pressing force, the movable part requires 1 $61 more. However, there is a problem with maintainability against wear, distortion, etc.

Honji@Hiro This is a probe support mechanism that solves the above-mentioned problems.In order to maintain the probe position -fi in the standby state and flaw detection state, elastic The fly probe is supported by a combination of a support mechanism that has elastic expansion and contraction and a mechanism that applies pre-elastic strain to it, and the fly probe is rIAji! A probe support mechanism characterized in that the probe is held and in a flaw detection state, by applying a force greater than the above-mentioned sub-bullet Ik strain, the probe is elastically freely supported only by the elastic support mechanism. It is.

The present invention will be described in detail below using examples shown in Figures 2 to 5. Figure 2 shows the standby state, so the object to be inspected 1 and the probe are built in. A support mechanism 11 having elasticity for elastically supporting j), &-) 10 is given a predetermined amount of prestrain by a prestrain setting device 12. Pre-strain setting device 11! It is stable by pressing with nine force according to the pre-strain. Tsume pre-strain setting device 1
2 is rigidly supported by the support stand 20, so in the state of 10) 10 is held in a state close to fixed support. In addition, the support stand 20 is equipped with a non-solid opening/closing device for inspecting the material to be inspected! When the flaw detection is carried out in the near direction, the material to be inspected can also be moved in the direction of separation. Figure 3 shows the flaw detection condition.
The entire probe support mechanism is pressed against the test target #l, and the contact between #-) 1G and the prestrain setting device 12 is released, but -) 1G is caused by the elastic support mechanism 11. It is elastically supported and can freely follow the positional displacement of the inspected material l.

In the illustrated example, a Nara 13 is provided as a device for adjusting the amount of pre-strain, but it may also be an adjusting mechanism using shims or other methods. However, it is sufficient to use an elastic body such as a pep-zu or a coil spring, and it is of course possible to construct a structure using a combination of these.

The pre-strain setting device 12 must be arranged and shaped so that it will not interfere with &-) 10 in the flaw detection state and deteriorate its followability. Since the optimum arrangement must be made by considering the amount and direction of displacement, the prestrain setting device 12t$-) 10 may be arranged in the circumferential direction as shown in Fig. 2 and Fig. 3; For flaw detection of steel pipes, it may be placed in the axial direction. As an example of these, FIG. 4 shows %O, which shows an example in which a pre-strain setting device is arranged in the center of the cart.

Figure 4 shows a standby state lil and is an example in which a bellows 11-a and a coil spring 11-b are used in combination as an elastic support mechanism. In this state, the bellows 11-a and the coil spring 11-b are compressed from their free lengths by a set amount by the prestrain setting device 12, and this reaction force causes them to be rigidly fixed to the #-) 10 and the support base 20. It works between the pre-strain setting device 12 which is The support stand 20 is held at a fixed position by a support device 21 that is connected to a switchgear (not shown); however, when a flaw detection status signal is received, the support device 21 is activated by the switchgear. 0 device group against the material to be inspected. If this pressing force is made larger than the pre-strain setting force, further distortion will occur in the bellows 11-a and the coil spring 11-m5, which are the springs, so that the 1) The pre-strain setting device 12 and --) 100
G is pressed against the material to be inspected in a highly flexible supported state by the peps 11-a and the spring 11-a, making it easy to follow the displacement of the material to be inspected.
The figure shows the relationship between - and force for pre-strain setting tubes. This figure shows the force relationship assuming a case where detective equipment such as a probe performs flaw detection while rotating. What is the centrifugal force r acting on s? ΔF is the follow-up pressing force required to make the test material follow the displacement of the standard test material (cylindrical body such as a /4 Ig or a round bar), and ΔF is the follow-up pressing force variation due to follow-up tightness and other factors. The larger the follow-up pressing force r is, the better the followability of &-) is, but in consideration of the accompanying increase in mass, an appropriate value should correspond to the &-) centrifugal force P, and the contact strain δ of the elastic support. Furthermore, a preload P is set at the cart centrifugal force pH1 and O at a position that does not interfere even if fluctuations in ΔF occur, and a predistortion commensurate with this is determined. With this setting, in the standby state, due to the force of (p, -p,)) & -) is in contact with the rigidly supported prestrain setting device, so that the head oscillation due to the vibration of the centrifugal kayak mechanical system will be prevented. This prevents the occurrence of movement, and also creates a gap of (δF'?) during flaw detection to prevent the pre-strained film ji! It is possible to move away from the constraints of the device and freely follow the object to be inspected. Although the trap depends on the lifetime strain (stress) amplitude of the elastic support, the strain amplitude generated in the standby state and flaw detection state can be reduced from δ to (a, -a,) by applying prestrain. This allows the elastic support to extend the life of the parts. In addition, in rapid flaw detection, it is often necessary to quickly transition from the standby state to the flaw detection state, and this mechanism is able to maintain stability against this shocking signal and maintain 7't&-).

The above-mentioned advantages can be applied to flaw detectors that detect flaws while the probe moves in a straight line.Also, only the material to be inspected is directly transported or rotated, and the probe is held at a fixed position while the material to be inspected is being transported. It can also be applied to structural O flaw detection equipment that performs contact and evacuation. In addition, the shape of the material to be inspected is not limited to the expanded cylindrical shape, but also the plate shape, rectangular bar shape, and other shapes, and the detection end is limited to the ultrasonic method, so it can also be applied to electromagnetic detection methods. .

[Brief explanation of the drawing]

Fig. 1 is a conceptual diagram showing that the probe needs to follow the angle in the case of a cylindrical inspected material, and Fig. 2 shows the &-), elastic support, and prestrain setting device in a standby state in an embodiment of the present invention. Fig. 3 is a diagram showing the machine @ relationship in Fig. 2 in a flaw detection state, Fig. 4 is a schematic diagram showing the case where a pre-strain setting device is installed in the center of the plate, Fig. 5 is a schematic diagram showing the relationship between It is a graph showing the relationship between strain and force according to the present invention. l...material to be inspected, lO...° probe consonant built-in, one, 11 and 1
1-& and 11-b... Elastic support mechanism (/4), 12... Pre-strain setting device, 13- Child strain adjustment nut,
20... One support for an elastic support mechanism and a pre-strain setting device; 21... A support device for a target tracking system. Ii 1 Ward 2nd Figure: 4 Ward

Claims (1)

[Claims] Since the position of the 1a11A probe changes between the standby state and the weaving state, the 1a11A probe support machine 111 has an elastic wire drawing at, and a support mechanism for giving pre-elastic strain to it. (Let him hold his head) Support the probe, and let the probe touch him!
In the state where it is separated from the material, the probe maintains its field power**, and in the flaw detection state, the probe expands and contracts by applying a force greater than the pre-elastic strain mentioned above to the support mechanism Oli. The probe support mechanism takes advantage of the fact that it has a highly elastic free support.