JPS5946552A - Automatic ultrasonic flaw inspector - Google Patents

Abstract

PURPOSE:To enable predetection of any error in the set height by setting heights of a holder and a guide roller separately corresponding to the outer diameter of material to be inspected while the heights are detected by crosschecking. CONSTITUTION:When the outer diameter of material to be inspected is set with an outer diameter setting digital switch 22, the center height of a rotation mechaism section is computed with a rotation mechanism section height conversion arithmetic unit 23 and the computed value outputted to a comparator 25-a. The comparator 25-a compares the computed value with a digital value of a converter 27-a and provides a command to a lift motor 8 to lift the rotation mechanism section. Outputs of converters 27-a and 27-b are inputted into a comparison arithmetic unit 28 to perform a computation from a digital value of rotation mechanism section height and a digital value of guide roller height to determine whether or not the results are within a certain allowable value. When it is above the allowable value, an alarm is outputted outside arousing a caution that the set height is not correct.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic ultrasonic flaw detection device that detects flaws by moving a test material straight on a hollow shaft of a two-rotation mechanism. 2. Description of the Related Art The rotating mechanism part of an automatic ultrasonic flaw detection apparatus for detecting defects on a test material such as a round bar or pipe is shown in FIG. 1, and the roller for conveying the test material shown in FIG. 2 is known.

In Figure 1, (1) is the material to be tested such as a round bar or pipe,
(2) is a transport roller that transports the material to be inspected, and (3) is a front pinch roller that guides the transportation of the material to be tested relative to the hollow shaft of the rotating mechanism. 1
) also serves to eliminate deflection of the tip due to its own weight.

(4) is a fixed frame of the rotation mechanism, (5) is a fixed guide integrated with the fixed frame, (6) is a hollow shaft that is rotated at high speed by a motor (not shown),
(7) is a probe holder that is fixed to a hollow shaft and rotates.

The probe holder has a hollow cylindrical shape, and water comes out from near each probe. When the material to be inspected is conveyed to the hollow shaft,
The ultrasonic waves transmitted from the probe are propagated to the test material using the water column as a couplant. The probe is a sensor that receives ultrasonic echoes reflected from the specimen and generates signals to determine the presence or absence of flaws and the size of the flaw, and is the key to automatic flaw detection equipment.

Note that the gap between the probe holder and the test material is large due to the need to raise the water column (because it cannot be removed, it is necessary to accurately align the center of the hollow shaft of the probe holder with the outer diameter of the test material to be transported).
8) is the rotation mechanism lift motor that raises or lowers the rotation mechanism, (9) is a pole screw screw that converts the rotation of the motor to raise or lower power and transmits it, and αG is conveyed by the front pinch roller (3). A cylindrical guide roller that supports the tip of the material to be inspected and eliminates deflection due to the weight of the material to be inspected, (b) is a guide roller lifting motor that raises or lowers the guide roller 00, and (2) is a rotation mechanism. The rotation mechanism section scale plate shows the height of the rotating mechanism section, (To) is the rotation mechanism section pointer that follows the elevation of the rotation mechanism section, α→ is the guide roller scale plate that shows the height of the guide roller, (G) is the guide roller The guide roller pointer follows the lifting and lowering, (to) is the bearing that mechanically connects the rotating part of the rotation mechanism and the fixed part, α force is the rear pinch roller that guides the conveyance of the specimen, (to) Q false Indicates a rotation mechanism unit and a guide roller rotation angle detector such as an encoder that converts the height of the guide roller into an electric signal, and a signal transmission/reception device such as a slip ring. The fixed frame (4) and the hollow shaft. (6) respectively. The signal transmitting/receiving device has one set on the rotating side and the fixed side to transmit ultrasonic electric signals, and one set corresponds to one probe. Therefore, when a large number of probes are used, a large number of probes are required, a large amount of storage space is required, and the rotation mechanism is large. (c) indicates the ground. In Fig. 2, (1) is the material to be inspected, (2) is the conveyance roller, and the angle is 1 as 1 flj.
A 40° ■ roller is shown. In Figures 1 and 2, the method of aligning the central axis of the rotation mechanism and the cylindrical side surface of the guide roller with the center of the outer diameter of the material to be inspected (this is called pass line setting)
Explain. The material to be inspected (1) is transported to the rotation mechanism section by a transport roller (2) and a pinch roller (3). The center height Hl of the material to be inspected (1) when it passes through the conveyance rollers shown in FIG. 2 has the following relationship with the outer diameter of the material to be inspected.

Since the 10,000 guide roller is a cylindrical roller, the side surface height H2 when the test material (1) passes is given by the following equation.

H2=D/2・・・・・・・・・・・・
(2) The center height of the rotating mechanism relative to the outer diameter of the material to be inspected is determined from equation (1). Therefore, a method is used in which the center height is set in advance on the scale plate Q2 in FIG. 1, and then the pass line height is raised and lowered by the rotary machine sliding part 7 rotating mechanism lift motor (81) so that the pointer Q31 matches the scale.

The same is true for the guide roller, as expressed by equation (2). The total height of the guide roller side surface is set on the scale plate α4 shown in Figure 1, and the guide roller lift motor 111, which is independent of the rotation mechanism part 81, raises and lowers the pointer a5 to the pass line height.
1. Find out how to match the scale. In the early days, the method of setting the pointer to all scales was by human eyes, but automatic setting is now possible.The block diagram in FIG. 3 is one example of this. Referring to the block diagram in Figure 3, (A) is an outer diameter setting digital switch (Incorporated) that sets the outer diameter of the material to be inspected using a digital value such as BCD. This is a rotation mechanism unit height conversion calculator that calculates the height, and the calculation is based on equation (1). (Foundation) calculates the guide roller side height.The calculation is (2) using the guide roller height conversion calculator.
) according to the formula. (C) is a comparator that compares the digital values of the rotation mechanism section and guide roller height conversion calculator with the converter, and transmits the lift command to the motor controller (E) using the difference signal. or a motor controller that provides a downward drive signal to the motor (8), a converter that converts the signal of the rotation angle detector so that the comparator (c) can easily compare it, and an outer diameter setting digital switch ( ) When the outer diameter of the material to be inspected is set, the rotating mechanism height conversion calculator calculates the formula (1), calculates the center height of the rotating mechanism, and stores the calculated value in the comparator ('25-a). Served. This comparator compares the calculated value with the digital value of the converter (27-a), and if the former is larger than the latter, it gives an ascending command, and if the former is smaller than the latter, it gives a descending command to the lifting motor. The rotation mechanism moves up and down as the motor rotates. The rotation angle detector (to) of the rotation mechanism is connected to the lifting shaft through gears and converts the height position into an electrical signal. The electrical signal is transmitted through a converter (27-a
) and becomes the feedback signal of the comparator in the rotating mechanism section. The comparator always compares the set value and the feedback, and when both are negative, the command to the lifting motor is turned off.

This state is the completion of the pass line setting.

The path line setting of the guide rollers is simultaneously performed in a similar manner. Pass lines are set for the rotating mechanism and guide rollers by individual lifting devices, but since they are machines, it should be considered that errors in setting heights may occur on rare occasions. The material collides with the rotating mechanism or the guide roller, leading to destruction of the rotating mechanism or the guide roller. This invention attempts to detect the above deficiencies in advance. Does this invention independently set the pass line for each of the rotation mechanism section and the guide roller mechanism section? Are you using mutual settings? It can be seen that the above equation (11) and equation (2) have the same relationship as the following equation.

(Equation (2) from Equation 11? The value subtracted? Let it be X.

Here, h is a constant since it is the distance from the center point of the conveyance roller to the bottom of the V-groove as shown in FIG. 2(A).

The angle θ is a constant, and in one example, it is 140°.

The formulas are +41 and +51.

x=kD+h ・・・・・・・・・・・・
... (4) k, -0,082・・・・−・・−・・
... (5) Make sure each pass line is set correctly.
In this case, the above equation (4) is always satisfied. Conversely, if the above equation (4) is not satisfied, there is an error in one or both of the set values.

Immediately after setting the pass line, the calculation process of equation (4) above is performed, all errors are detected before the test material enters, and there is an alarm? If this occurs, destruction of the device can be prevented.

FIG. 4 μ shows a specific example of this invention, and shows all the parts added to FIG. 8.

A specific example of Figure 4? explain.

The outputs of the converters (27-a) and (27-b) are (
Comparison calculator (c) fully input n1 From the rotation mechanism height digital quantity and the guide roller height digital value i', 7 calculations of equation (3) are performed, and the calculation result is a constant allowable value of the constant n shown by equation (4). Check whether the conditions are satisfied or not, and if not, output an alarm to the outside.

As described above, in this invention, the height of the rotating mechanism is set by setting each of the holders and guide rollers individually, so by cross-checking all of the set values, any errors can be detected in advance. be able to.

[Brief explanation of the drawing]

Figure 1 shows a cross section of the rotating mechanism of an ultrasonic automatic flaw detection device. Figure 2 is a cross-sectional view of the roll that conveys the test material;
An example of setting a pass line in Figure 8? FIG. 4 is a diagram showing an embodiment of the present invention. In the figure (11 is the material to be inspected, +21i conveyance roller, +31: front pinch roller, +41t'ff fixed frame, +51
fi fixed guide, (6) is hollow shaft, +71 is probe holder. (8) is the rotating mechanism part lifting motor, (9) is the pole screw, (Ili guide roller, σ11 is the guide roller lifting motor, a'an rotating mechanism part scale plate, 03 is the rotating mechanism part pointer, Q4) i guide Roller scale plate, as+H
Guide roller pointer, ueH bearing, αη is rear pinch roller, and bet is rotating mechanism rotation angle detector. a! I is the guide roller rotation angle detector, ■ is the signal exchange device, aη is the ground, (A) is the outer diameter setting digital switch, (C) is the rotation mechanism height conversion calculator, (Foundation) is the guide roller height Conversion calculator, c! ! 9i comparator, (c) motor controller, @ho converter. In addition, the same reference numerals are attached to the same parts or parts in the figures. Agent Makoto Kuzuno - Figure 2 (A) (p. 471)

Claims (1)

[Claims] In an automatic ultrasonic flaw detection device in which a plurality of ultrasonic probes are embedded on the circumference of a holder inside a rotating mechanism, and a test material such as a round bar or pipe is passed through a hollow shaft of the rotating mechanism, a probe is placed at the rear of the rotating mechanism. The holder and the guide roller each have a mechanism for independently setting the height corresponding to the outer diameter of the test material, and a mechanism for independently setting the height according to the outer diameter of the test material. Since the height setting values of the holder and the guide roller have a certain relationship, the two are compared, and if the comparison result exceeds a certain tolerance value, the height setting diameter is An automatic ultrasonic flaw detection device characterized by being configured to be able to detect incorrect settings and issue an alarm or stop transportation.