JPH0723741Y2 - Tire roll support / roll device - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention relates to a support / roll device for a tire probe used for automatic ultrasonic flaw detection of a steel plate or the like.

(B) Prior Art When ultrasonically flaw-detecting a strip for hot or cold rolling continuously, the method most commonly used is to use a tire probe. When a tire probe is used, a long support roll 1 extending in the width direction of the strip is required as shown in FIG. The support roll 1 is installed directly below the lower portion of the tire probe 2. However, the conventional tire probe 2 has the following problems. Since the tire probe 2 is installed between the support rolls 1, the downward stroke of the tire 21 changes due to the change in the shape of the steel plate 3 and the change in tension. This is because the tire probe 2 is always applied with a constant pressing force in order to stabilize the tire probe conditions for the steel plate 3.
This slight stroke change or vibration changes the incident angle of ultrasonic waves by 0 to 4 degrees. This causes a problem in automation and stabilization of sensitivity in ultrasonic flaw detection using plate wave ultrasonic waves.

(C) Problem to be solved by the invention The problem to be solved by the invention is to arrange a support roll below the tire probe across the material to be inspected and stably support the support roll at an appropriate position. However, it is to improve the flaw detection sensitivity.

(D) Means for Solving the Problems The support roll device for a tire probe of the present invention has a narrow support roll arranged below the tire probe with a test material interposed therebetween. The roll is movably supported by the position adjusting mechanism in the width direction of the test material, and the support roll is positioned immediately below the probe and outside the ultrasonic wave incident point from the probe to the test material. The above-mentioned problems are solved by means characterized by adjusting so as to Here, the outside of the ultrasonic wave incident point is the side of the edge of the material to be inspected closest to the probe.

(E) Action The reason why the positioning of the support roll is necessary is that the echo transmitted from the tire probe positioned at a predetermined distance from the end surface of the test material reaches the other end surface of the test material. It must be able to fully propagate and fully receive its reflected waves. To that end, the position of the support roll is extremely important. That is,
In order to work most effectively as a support roll, it is optimal to arrange the test material so that it is sandwiched directly below the tire probe. However, in the conventional long support roll, the ultrasonic wave is absorbed by the roll, and the ultrasonic wave is hardly propagated to the test material.

Therefore, it is necessary to have the shape and arrangement of the support roll that receives the load of the tire probe but eliminates the loss of ultrasonic waves. For that purpose, a load is applied by the support roll up to the ultrasonic wave incident limit position, and the position is always maintained. By the way, the position of the tire probe is adjusted by meandering the test material, camber, changing the plate width, and the like. Therefore, it is necessary to constantly grasp the position of the tire probe and to keep the proper relative positional relationship by interlocking the support roll with the tire probe. For this reason
It is necessary to detect the position of the tire probe and control the position of the support roll by the position adjustment mechanism.

(F) Embodiment An embodiment of the support / roll device for the tire probe of the present invention will be described with reference to FIGS. 1 and 2.

According to the support roll device of the present invention, the support roll 4 is arranged below the tire probe 2.
Are supported by the position adjusting mechanism 5. The position of the support roll 4 is adjusted by the position adjusting mechanism 5 in the width direction of the steel plate 3 with respect to the ultrasonic wave incident point P from the probe 2 to the steel plate 3 as the test material. The support roll 4 is formed into a narrow width as shown.

The position adjusting mechanism 5 includes a frame 51 and a screw shaft 5
2. Made of guide rod 53 and bearing 54. The frame 51 supports the narrow support roll 4 rotatably via a bearing 54. The frame 51 is connected to the motor 7 by means of a screw shaft 52 connected to the steel plate 3 at the point of incidence P.
Is moved in the board width direction. Guides movement of frame 51
Stabilize smoothly with rod 53.

The position of the frame 51 is detected by the conventional pulse generator 6 connected to the motor 7. The frame 51 is raised and lowered by a conventional hydraulic device or the like (not shown).

When the position of the tire probe 2 changes due to meandering of the steel plate 3, camber, width change, etc., the position adjusting mechanism 5 moves the support roll 4 to the tire probe 2 based on the position information.
It is moved in the plate width direction so as to be immediately below and outside the ultrasonic wave incident point.

The effect of the present invention is shown in FIGS. FIG. 3 shows the stabilization of the incident angle. FIG. 4 shows stabilization of flaw detection sensitivity.

The influence of the position of the support roll 4 and the inclination angle α of the steel plate is shown in FIGS. 6 and 7.

As shown in FIG. 6A, when the support roll 4 is positioned within the incident point P of the ultrasonic wave 7, a part of the ultrasonic wave 7 flows into the support roll 4 and is lost. In FIG. 6 (B), since the support roll 4 is located outside the incident point P, there is no loss of ultrasonic waves.

As shown in FIG. 7 (A), when the steel plate 3 is inclined from the horizontal position at an inclination angle α = 1 to 3 degrees, a flaw detection error occurs. As shown in FIG. 7 (B), by providing the support roll 4 directly below the tire 21 of the flaw detector 2, the inclination of the steel plate is eliminated. (G) Effects According to the present invention, the following effects can be obtained.

 Highly accurate incident angle setting can be automated.

In the conventional method, the incident angle is 0 depending on the plate thickness, steel plate tension, and steel plate shape.
There was an error of ~ 4 degrees, but it completely disappeared.

As a result, the variation in the flaw detection sensitivity becomes extremely small, and the flaw detection can be stabilized.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a support / roll device for a tire probe of the present invention. FIG. 2 is a side view taken along the line II-II in FIG. FIG. 3 is a graph showing the effect of the present invention in which the incident angle is stabilized. FIG. 4 is a graph showing the effect of the present invention in which the flaw detection sensitivity is stabilized. FIG. 5 is a perspective view of a conventional support roll. FIG. 6 is an explanatory view showing the difference in ultrasonic wave propagation depending on the position of the support roll. FIG. 7 is an explanatory diagram showing a difference in ultrasonic wave propagation due to a difference in type of support roll. 4: Support roll, 5: Position adjustment mechanism 6: Pulse generator, 7: Motor 51: Frame, 52: Screw shaft 53: Guide rod, 54: Bearing

Claims (1)

[Scope of utility model registration request] 1. A narrow support roll is arranged below a tire probe across a test material, and the support roll is supported by a position adjusting mechanism so as to be movable in the width direction of the test material. A support roll device for a tire probe, which is adjusted so that the support roll is located immediately below the probe and outside an ultrasonic wave incident point from the probe to the material to be tested. .