JPS6283652A - Ultrasonic automatic flaw detection apparatus - Google Patents

Abstract

PURPOSE:To accurately calculate the speed of a material to be inspected, by operating the speed of the material to be inspected fed by a skew roll from the outer diameter of the material to be inspected and the skew angle and the number of rotations of said skew roll and correcting the operated speed on the basis of the detection values of two sets of photoelectric sensors. CONSTITUTION:A material 1 to be inspected being a round rod fed while rotated at a constant pitch by the rotation of a skew roll 5 (5a-5h) having a skew angle preset thereto is subjected to flaw detection over the entire region thereof by a flaw detection head 9. The rotation detector 16 connected to the rotary shaft of the skew roll 5 by a coupling forms a pulse signal corresponding to the number of rotations of the skew roll 5 and a counter 17 counts the pulse formed by the detector 16. An operator 12 operates the speed of the material 1 to be inspected from the outer diameter of the material 1 to be inspected and the skew angle/the number of rotations of the skew roll 5. Further, the speed operated from the outer diameter of the material 1 to be inspected and the skew angle the number of rotations is corrected on the basis of the speed calculated from the difference between times required when the material 1 to be inspected passes photoelectric sensors 10a, 10b, 10c, 10d arranged at definite distance intervals. By this method, the actual speed of the material to be inspected can be accurately calculated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an automatic ultrasonic flaw detection device for non-destructively testing steel products such as round bars or pipes using ultrasonic waves.

[Conventional technology]

FIG. 3 is a conceptual diagram of a conventional device for inspecting a specimen using an ultrasonic automatic flaw detection device, and FIG. 4 is a conceptual diagram of a conveying ski roll shown in FIG. 3.

In Figures 3 and 4, (1) is the material to be inspected such as a round bar for inspection with an automatic ultrasonic flaw detection device, (2) is the motor for rotating the TFI ski roll, and (3) is the direction change of the rotational force of the motor. Miter gear box (4)
) is a chain coupling gear box that further changes the direction of the rotation of the miter gear box (3) and connects it to the chain, and (5) has a preset angle of θ from the center line of the material to be inspected in the conveyance direction as shown in the diagram. Skirol T, (5a) and (5b), (5) rotated by a chain connected to the chain 7 coupling gear box (4)
It consists of combinations of c) and (5d), (5θ) and (5f), and (5g) and (5h). (6) is the motor (2)
The rotational force of each ski roll ((5C) and (5d),
(5@) and (5f), (5g) and (5h) ) with a shaft for transmitting (6a)? (6b) and (6c
). (7) is the mechanical part of the ultrasonic automatic flaw detection device.

(8) is 3 sets (8a) in which the flaw detection head is brought into contact with the material to be inspected and the flaw detection head follows the movement of the material to be inspected? (8b) e
(8C) is a tracking device, (9) is a flaw detection head that is attached to the tracking device and accommodates a probe that transmits and receives ultrasonic waves to the specimen, and αll is a photoelectric sensor (10a) and (
10c) is a photoelectric sensor floodlight, (tab) and (10
d) emits a signal to the computing unit at the moment the light is blocked by the test material being conveyed by the light receiver. αυ is a speed change control device for rotating the motor (2) in a required stable manner, and α2 is an input signal for contacting or separating control of the flaw detection head (9) of the follower (8) and for photoelectric sensor output. a3 is a chain for transmitting the rotation of the chain coupling gear box to the ski roll, and (15a) and (15'b) rotate the ski roll in the same direction. . .alpha. is a gear coupling for decelerating and transmitting the rotation of the motor (2), and .alpha. is a mount that supports the ski roll. The conveyance speed when conveying the material to be inspected by a skiwl roll depends on the angle of the skiwl roll and the rotational speed of the skiwl roll. Therefore, the conveyance speed cannot be determined immediately from the rotational speed of the skiwl roll, so conventionally the conveyance speed was Two sets of photoelectric sensors ((10a) and (10b) installed at fixed points above
A method has been used in which the transport speed is determined by the time difference between the moments when the specimen material shields two sets of photoelectric sensors using (100) and (10(1)). As shown in Figure 3, the photoelectric sensor (
Let the distance between 10a) and (10b) be 11 (Ig).

Also, if the time difference between the time when the material to be inspected blocks light from the photoelectric sensors (10a) and (10b) is T1 (seconds), the velocity v1 of the material to be inspected is calculated by calculation unit α2 as Vl-L1/T1...・
・It is determined by fi+.

[Problem that the invention seeks to solve]

When detecting flaws in the entire area using an automatic ultrasonic flaw detection device, it is necessary to transport the material at a constant pitch speed.In the method described above, in which the transport speed of the test material is determined from two sets of photoelectric sensors, the test material always moves at a constant speed. However, in the case of automatic ultrasonic flaw detection equipment, since it is necessary to inspect the edge of the specimen, it is necessary to reduce the transport speed to a low speed near the position where the flaw detection head (9) is brought into contact with the material. There was a problem that conventional methods could not be applied. When conveying with a suski roll, the material to be inspected may slip due to the conveyance direction vector and the rotation direction vector. 6D It is difficult to convey the material at a constant speed at all times. This invention is intended to solve this problem. This was done to accurately determine the speed even when the speed of the material being tested changes.

[Means for solving problems]

Since the conveyance speed is related to the set angle (of the skier roll) and the number of rotations, this invention includes a rotation detector that generates rotational pulses on the rotation axis of the skier roll, a counter that counts the pulses generated by the rotation, and the two sets described above. The apparatus is equipped with a photoelectric sensor, and inputs the outer diameter of the material to be inspected, the set angle of the ski roll, the pulse count value, and the photoelectric sensor signal to a calculator to determine the conveyance speed.

[Effect]

Conveying speed V (llo
a) is determined by the following formula.

K is a coefficient that differs depending on the outer diameter of the material to be inspected, including slips during transportation.

First, the number of rotations of the ski roll is converted into pulses (by a rotation detector) and counted every second by a counter. The count value is input to a calculator and becomes an element for calculating the transport speed by calculating the equation (2). Next, the time difference T1 at the moment when the object to be inspected blocks light from the two sets of photoelectric sensors having a distance difference L1 is determined by a calculator, and the conveyance speed vl is determined by the above equation (1).

Letting the ratio of the speeds v2 and vl be the correction coefficient α, α can be obtained from the following equation.

“-π°゛°°゛°°゛゛(3) In equation (3), if α-1, vl and v2F′i are equal, but normally it is rare that α-1 (2
) Conveying speed Vs −/a V2 (1/a) (4) is the corrected speed and becomes the actual conveying speed of the material to be inspected.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2.

In FIGS. 1 and 2, (1) to α9ii are exactly the same as the conventional devices described above. (15 is Scyro longevity (5
) generates a pulse signal corresponding to the number of rotations of the ski roll by a rotation detector connected to the rotating shaft of the rotor by a coupling.

α71 is a counter that counts the pulses generated by the rotation detector αe, and aa is a compling that connects the squirrel (5) and the rotation detector αe.

Set the angle and rotation speed of the ski roll in advance and perform the above (
2) Calculate the transport speed v2 using the formula a'a and transport the material to be inspected. The material to be tested is two sets of photoelectric sensors ((
10a) and (10b) and (10c) and (1oa)), the conveyance speed determined by inputting the pulse whose rotational speed is converted by the calculation of equation (2) above is considered to be the actual conveyance speed. . When lowering the flaw detection head (9) to a low speed near the position where it contacts the material, the rotation speed of the ski roll is controlled by the motor (
2) Drain. Therefore, since the number of pulses of the rotation detector αe is small, it is possible to calculate a low speed. Immediately at the moment when the photoelectric sensor is shielded from light, the arithmetic unit α calculates the correction coefficient according to the above equation (3), and executes the calculation according to the above equation (4) to obtain the actual speed. By subsequently using the correction coefficient (2) determined by the equation (3) above, the actual conveyance speed of the material to be inspected can be obtained.

〔Effect of the invention〕

Conveying speed using the above equations (21, +31 and (4)) not only allows you to determine the actual speed even when the speed is variable, but also calculates the speed for each specimen being conveyed, so it is always easy to convey. Even if the conveyance speed varies from one book to another, even if the speed is corrected.

It has the advantage of being able to obtain accurate conveyance speed.

[Brief explanation of drawings]

FIGS. 1 and 2 are conceptual diagrams showing one embodiment of the present invention, and FIGS. 3 and 4 are conceptual diagrams showing a conventional device. In the figure, (!) is the material to be inspected, (2) is the motor, and (3)
is a miter gearbox, (4) is a chain coupling gearbox, (5) is a ski roll, and (6) is a shaft. (7) is the mechanical part, (8) is the tracking device, (9) is the flaw detection head, α1 is the photoelectric sensor, (10a) and (10c) are the projector, (10b) and (10(1) are the light receiver, αB is a variable speed controller, α side is a computing unit, (131 is a chain, α
ri is a gear coupling, α4 is a frame, aQ is a rotation detector, αD is a counter, and 猽 is a coupling. Note that the same reference numerals in each figure indicate the same or equivalent parts.

Claims (1)

[Claims] In an ultrasonic automatic flaw detection device that detects flaws over the entire area of a test material such as a round bar or pipe that is conveyed at a constant pitch by rotation of a skew roll with a skew angle set in advance, rotation detection detects the rotation of the skew roll. a counter that counts the pulses of the rotation detector, two sets of photoelectric sensors provided at fixed points on the conveyance line, and a calculator that calculates the signal of the photoelectric sensor and the count value of the rotation detector. The speed of the material to be inspected conveyed by the skew roll is calculated from the outer diameter of the material to be inspected, the skew angle of the skew roll, and its rotation speed, and the two sets of photoelectric sensors spaced apart by a certain distance are connected to the object to be inspected. An automatic ultrasonic flaw detection device characterized in that the actual speed of the test material is determined by correcting the calculation speed of the test material outer diameter, skew angle, and rotation speed based on the speed determined from the time difference in which the test material passes.