JPS5913953A - Automatic ultrasonic flaw detector - Google Patents

Abstract

PURPOSE:To obtain the functions of AUST and to realize long-period use, by providing a hollow ring detection part united with a rotating mechanism part to the front of an automatic ultrasonic flaw detector which detects a flaw of a material to be tested by moving the material to be tested straight on the holle shaft of the rotating mechanism part. CONSTITUTION:The hollow ring detecting part 15 is provided in front of a fixation frame 3 for the rotating mechanism part and four contactless sensors 16a- 16d are arranged at intervals of 90 deg. on the same tip circumference of the hollow ring detecting part. Those sensors are arranged in four up, down, left, and right quadrants on the same circumference of the hollow ring detecting part and when the material to be tested passes by, they generate voltages corresponding to the distances from the sensors. The output voltages of the two up and down contactless sensors 16a and 16c are amplified by amplifiers 17a and 17c and converted by analog-digital converters 18a and 18b into digital signals respectively. Those two digital signals are compared with each other by a comparing and computing element 19 to find the difference in digital value and its direction, and an ascending or descending command is sent out to a motor controller 21. The motor controller 21 controls the rotating direction of a motor 7 according to the ascending or descending command.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic ultrasonic flaw detection device that detects flaws in a test material by moving the test material completely straight on a hollow shaft of a rotating mechanism.

The conventional persimmon super back U automatic flaw detection device (hereinafter referred to as AUST device) shown in FIG. 1 and the roller for conveying the test material shown in FIG. 2 are redundant.

In Figure 1, ) is the test material such as a round bar or pipe,
(2) is a front pinch roller that guides the conveyance of the material to be inspected;
(3) is a fixed frame (4) of the rotating mechanism section, is a fixed guide (5j is a hollow shaft that rotates at high speed by a motor not shown), [61 is a probe holter 9 that is fixed to the hollow shaft and rotates ( 7) is the motor that raises or lowers the entire rotating mechanism, (8) is the pole screw that transmits all of the motor's power, (9) is the pinch roller on the ridge surface, and the symbol is the scale that indicates the height of the rotating machine #1 section. board, aII is a pointer that follows the rotation @ the elevation of the structure, a2J is a conveyor roller that transports the entire sample to be inspected (131 is an orifice attached to the probe holder, and a gear wheel between the probe and the sample ( 2) Something that adjusts the amount of water in the binding medium (persimmons indicate above ground).

In FIG. 2, the mountain indicates the V-shaped conveyor roller for the material to be inspected t121.

Referring to FIGS. 1 and 2, a complete explanation will be given of the method for aligning the center metal of the nine axes of the rotating mechanism section with the center of the outer diameter of the material to be inspected.

This is called gold pass line setting.

The material to be inspected (1) is transferred to the conveyor roller 021 in FIG. It is conveyed to the rotation mechanism section by the pinch roller (2). Conveyance roller t12+, 1! : Pinch roller i21 [91 is shown in Section 2 and has a V-shaped shape with an angle θ of 1400
Take things like hardware.

Center height h when the subject Murayama passes all the conveyance rollers in Figure 2
has the following relationship with the outer diameter DVc of the test material (1).

Therefore, what is the center height relative to the outer diameter? Scale plate +I in Figure 1
01K is inserted and the motor (7) moves the rotating mechanism up and down to match the scale of the pointer.

Probe holder +61 in Figure 1 [Fixed Orif (3) Chair f131 raises the water column and maximizes the ultrasonic coupling between the probe and the test material! i, and the gap with the material to be tested is small, about 1 to 4 gates.

Therefore, the path line setting requires a phase change and the error is kept within about 0.5°.

In the conventional pass line setting method described above, even if the outer diameter tolerance of the test material is within the orifice gap, the height is fixed after the pass line is set, so it is not possible to bend the long test material in the long direction. If the inspection shrine is not able to do so, it may collide with the IC when entering the shrine, or it may be towed due to a bend in the passage.
M causes damage.

In addition, even if it is not caught, when the material to be inspected passes, it deviates from the center of the hollow shaft of the one-rotation mechanism, making it difficult for a water column to stand up in the area where the gap becomes large, which may prevent the propagation of Super Shin U.5 AU
Does it function as an ST? There will be flaws in not showing your full potential. Moreover, due to the thickness of the conveying roller due to the use of the length M, the scale does not match the height, making it necessary to periodically calibrate the scale.

This invention attempts to eliminate the above-mentioned drawbacks.

(4) This invention is provided entirely in front of the hollow ring detection unit integrated with the rotation mechanism unit, and the hollow ring detection unit is provided at the entire distance from the test material in the vertical and horizontal directions of the four quadrants on the same circumference. Embedded 4 non-contact proximity SEFFs for detection.

When the material to be inspected passes, the distance is detected from four directions, and after converting it into an electrical signal, the upper, lower, left and right detection paths #fi are all compared, and the difference value and its direction are calculated, and the center of the 4J1 inspection material is determined. It performs all calculations to find out where the object is, and controls the rotating mechanism vertically and horizontally so that the calculated value converges to zero, and causes the center of the hollow shaft of the rotating mechanism to follow the center of the outer diameter of the material to be inspected. be.

Figures 3, 4 and 5 show embodiments of this invention.
Hollow shaft detection unit 1 is installed in front of the rotation mechanism unit fixed frame (3).
151 k is provided, and four non-contact proximity sensors f (16a) to (16d) are provided on the same circumference at the tip of this hollow ring detection part.
are arranged at 90' intervals.

The non-contact proximity sensors f are arranged on the top, bottom, left and right sides of the four quadrants on the same circumference of the hollow shaft detection unit, and when the test phase is in contact.

As shown in Figure 4, the contactless proximity sensor distance NIV
c A corresponding voltage is generated. Fig. 5 is an example of a sensor in the vertical direction (5). The signals are then converted into digital signals by analog-to-digital converters (18a) and (18c), respectively.

The two converted digital signals and the comparison calculator (191
A comparison operation is performed to find the difference and direction of the digital quantities, and a command is given to the motor controller to raise or lower.

Is the command the distance between the R contact proximity sensors? Since the purpose is to make them equal, the upper direction of the non-contact proximity sensor is thicker (if Q is a rise, if it is small, F' is a fall).

The motor controller controls the motor (
7) Rotation direction is controlled.

The rotating mechanism part moves up or down depending on the direction of rotation of the motor,
Non-contact proximity (=inch output 1 pressure is equal, i.e.

The motor stops when the center of the object to be inspected and the center of the rotating mechanism coincide.

By continuously performing the above-mentioned control, the center of the hollow shaft of the rotating mechanism can always be made to follow the center of the outer diameter of the test material6).

In addition, FIG. 3, FIG. 4, and FIG. 5 show examples of the vertical direction, but the horizontal direction can also be controlled in the same way.

This control makes it possible to improve the above-mentioned drawbacks of the conventional automatic super-neck flaw detection equipment.

[Brief explanation of the drawing]

Figure 1: A diagram showing the entire surface of a conventional super-back automatic flaw detection device.
Figure 2 is a diagram showing the entire cross section of the roll conveying the test object t4f, Figure 3 is a diagram showing an example of this invention, and Figure 4 (A) is a diagram showing the middle 9
A diagram showing a front sectional view of wheel detection @1151. Figure 4 (b) is a diagram showing the percent conductivity of the non-contact proximity sensor, and Figure 5
FIG. 2 is a diagram showing an example of a circuit implemented in the present invention;
1) is the material to be tested, (2) is the front pinch roll, (3) is the rotating mechanism fixed frame 14) is the fixed guide, +51V
i hollow shaft), f6) is the probe holder, and (7) is the lifting motor. (8) is the pole screw, (9) is the rear pinch roller, 00j scale plate, 1lllVi pointer, +12
1 is the conveyance roller, +131 is the orifice, +141
is on the ground, 1151 is the hollow ring detection part, +16i non-contact proximity sensor upwards, +171 is the non-contact proximity sensor (
7) In the lower part (the numeral is the direct pressure amplifier, the a91po analog digital V converter, the crest is the comparator, (2D is the motor controller), and the same or corresponding parts in the figure are indicated with the same reference numerals. Agent Shin Kuzuno - (8) Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] A plurality of ultrasonic probes are embedded on the circumference of a holder in a rotating mechanism, and a test material such as a round bar or a vibrator is passed through a hollow shaft of the rotating mechanism. The automatic deep scratch device for fully inspecting for defects has a hollow detection section integrated with the rotating mechanism section in the direction of arrival of the gold specimen, and a 90° angle 17i on the same circle within this detection section. Distribute at intervals! is,
Then, when the test material passes, the distance to the rotating mechanism section is detected from four directions by the 4-color non-contact proximity sensor fVc which detects the entire distance to the test material, and the detected distance is converted into an electric signal. Compare the upper and lower and left and right detection distances, calculate the difference value and all its directions, and rotate a! so that the above calculated value converges to zero.
Control the entire structure so that it moves downward and left and right,
An automatic ultrasonic flaw detection device characterized in that the center of a hollow shaft of a rotating mechanism follows the center of an outer diameter of a material to be inspected. (1)