JPS6222840Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an ultrasonic flaw detection device that mainly tests rotating bodies such as wheels.

As an apparatus for ultrasonic flaw detection of wheel rims, bosses, treads, etc., the one shown in FIG. 4 has been put to practical use. This is achieved by installing support rollers 33, 33, which are rotationally driven by a motor 32 provided above, parallel to each other at an appropriate distance, facing in the same direction around a horizontal axis at the center of the lower part of a support frame 31 provided in the aquarium. An elevating frame 36 is provided above the support rollers 33, 33, and is moved up and down by a motor 34 via a transmission shaft 35. The probe units A, A, B, and C for detecting flaws in the cylindrical portion of the cylindrical surface are vertically mounted using holders 37a, 37b, and 37ac. Each holder 37a, 3
7b and 37ac are screw rods 38 and 3 provided on the lifting frame 36.
It is possible to adjust the movement in the left and right direction by forward and reverse rotation of 8. Then, the wheel M, which is the object to be flawed, is transferred in the direction of the arrow on the sloped lower guide 40 while its both sides are supported by the side guides 39 with its center line of rotation substantially horizontal. It is set across the support rollers 33, 33, and after performing ultrasonic flaw detection, the side guides 39 are placed on both sides.
It is designed to be carried out by rolling on a lower guide 41 while being supported by.

When the wheels M are set on the support rollers 33, 33, the wheels are rotated on the spot by the support rollers 33, 33 while being supported by the side guides 39 on both sides.

The probe units A, A, B, and C are initially retracted upward from the moving range of the wheels M by the lifting frame 36, and when the wheels M are set on the support rollers 33, 33, they are lowered. The wheels M are lowered to the same height as the respective flaw-detecting parts of the wheel M, and are horizontally opposed to the rim part a, the boss part b, and the tread c, respectively, and then moved in the left and right direction, respectively. For tread c,
They face each other with a predetermined distance apart. The water tank is filled with water up to the level shown by the two-dot chain line L, and each of the probe units A, A, B, and C uses this water as a couplant, respectively. c.
Ultrasonic waves are emitted from a plurality of probes constituting each probe unit. The ultrasonic waves are transmitted through the water to each part to be inspected, and if there are any flaws, they are reflected here and return through the water again.The probe captures the reflected ultrasonic waves and uses a rotating wheel to detect the presence or absence of flaws. Flaws are detected all around the circumference. However, in such a configuration, although the wheel M is supported by the side guide 39 and rotated by receiving rotational force from the support rollers 33, 33, the rotational center is not fixed, so the rotational posture is not stable. Due to the rotation, there is a large positional deviation between each flaw detection area and each probe unit A, A, B, C, and each probe and wheel M have a rim part a, a boss part b,
There was a drawback that a dimensional deviation occurred between the tread surface c and accurate flaw detection was not possible.

The present invention was developed in view of the above circumstances, and its purpose is to place a rotating body such as a wheel on a turntable in a horizontal position with its center of rotation perpendicular, and rotate it. , the displacement of the position and interval between the probe unit and the part to be inspected due to the deviation of the center of the turntable and the rotating body is eliminated by the copying mechanism, and the probe unit can be accurately placed against the part to be inspected. An object of the present invention is to provide an ultrasonic flaw detection device for a rotating object to be detected, which can be held facing each other with a predetermined separation dimension.

Hereinafter, the present invention will be specifically explained based on drawings showing embodiments thereof. Fig. 1 is a front view of the ultrasonic flaw detection device according to the present invention (hereinafter referred to as the device), Fig. 2 is a plan view thereof, and Fig. 3 is an explanatory diagram of the operation of the copying mechanism, where 1 is a water tank. A turntable 2 that rotates around a vertical axis is disposed in the water tank 1, and the wheel M, which is the object to be tested, is moved onto the rail R from the direction of the arrow in Fig. 2 using a hydraulic device (not shown). The wheel M is transported in a horizontal position with the shaft hole, which is the center line of rotation, facing vertically, and placed on the turntable 2, and after the wheel M has been inspected for flaws, it is carried out from the turntable 2 again by a hydraulic device (not shown). It is becoming more and more. A hollow support 4 is erected outside the water tank 1 facing the turntable 2 using a support frame 3, and an elevating frame 5 is disposed on the support 4. The lifting frame 5 is connected to the front wall 4a and the rear wall 4 of the support 4.
It is disposed horizontally with its tip facing the rotation center line of the turntable 2, passing through the support 4 through vertical long holes 4c and 4d drilled in the front wall 4a and rear wall of the support 4. A plurality of guide rollers 5a are provided on the lifting frame 5 in order to make contact with the lifting frame 4b, and an operating rod 6a of a hydraulic cylinder 6 provided at the upper part of the support 4 is connected to the lift frame 5 through the inside of the support 4.
The lifting frame 5 is moved up and down by the support 4 by the drive of the hydraulic cylinder 6.
It is designed to move up and down using the as a guide. The lifting frame 5 is formed into a square column shape with a hollow interior, and a hydraulic cylinder 7 is disposed inside the frame at a rear end side that projects rearward from the rear wall 4b of the pillar 4. A slider 9 for a horizontally moving frame 8, which will be described later, is slidably fitted on the front end side of the frame that projects further forward than the front wall 4a. A long groove 5b is formed in the lower wall on the front end side of the lifting frame 5 along the left and right center line thereof, and the slider 9 straddles this long groove 5b and moves rollers 9a, 9a provided on both front and rear sides of the long groove 5b. It is designed to be able to move forward and backward while contacting the inner surface of the lower wall. The rear end of the slider 9 is connected to the front end of a coil spring 10 of a required length, which is an elastic member, and the rear end of the spring 10 is connected to a spring stopper 7b provided at the tip of the operating rod 7a of the hydraulic cylinder 7. The extension and retraction movements of the operating rod 7a of the hydraulic cylinder 7 are transmitted to the slider 9 via the spring 10. The upper end of a hanging shaft 11 rotatably supported on the horizontal movement frame 8 using a bearing 8a is connected to the slider 9 through the long groove 5b of the lifting frame 5, and the horizontal movement frame 8 is connected to the slider 9. 9 and a hanging shaft 11, it is supported to be rotatable relative to the lifting frame 5 and movable forward and backward relative to the center of rotation of the turntable 2.

The horizontal moving frame 8 is formed in a square shape when viewed from the front by combining a vertical frame part 8b and a horizontal frame part 8c, and there is a space between the outer wall of the bearing part 8a of the hanging shaft 11 and the front part of the slider 9. Using the tensioned spring 8d, the horizontal frame portion 8c
Its orientation is regulated so that it is always positioned substantially vertically parallel to the lifting frame 5. And the vertical frame portion 8b
is located approximately on the same vertical line as the hanging shaft 11, and a probe unit C for detecting flaws on the tread c of the wheel M using a holder 12 is provided at the lower end, and is disposed on the horizontal frame portion 8c. Of the holders 13 and 14, the holder 13 is provided with a probe unit B for testing the boss portion b of the wheel M, and the holder 14 is provided with a probe unit A for testing the rim portion a of the wheel M. There is.
Each of the probe units A, B, and C is composed of a plurality of probes corresponding to the width of the respective flaw detection area.

Each of the holders 13 and 14 is suspended from the horizontal frame part 8c by a U-shaped part formed in the upper part, and the horizontal frame part 8c is suspended using a pair of guide rollers 13a and 14a that are pivotally supported in the upper and lower parts of this U-shaped part. It is possible to adjust the movement back and forth along the horizontal frame portion 8c in a manner that it is sandwiched from above and below, and furthermore, it can be fixed at any position using setscrews 13b and 14b. A support member 8e,
8e, a pair of vertical shafts 15, 15 are disposed on both sides of the hanging vertical shaft 11 in plan view. Each of the vertical shafts 15, 15 has its upper end supported by supporting members 8e, 8.
The rollers 15a and 15a for copying are rotatably supported on the lower end of the wheel M, and the rollers 15a, 15a for rolling contact with the tread surface c of the wheel M are supported on the lower end thereof. The copying rollers 15a, 15a are located slightly ahead of the probe unit C for tread c flaw detection.
That is, it is located on the turntable 2 side, and is pressed against the tread c by the elastic force of the spring 10, and each probe unit A, B, C is connected to the wheel M.
The rim part a, the boss part b, and the tread c are the parts to be inspected.
They can be maintained facing each other at a predetermined distance.

Next, the operation of the device according to the present invention constructed as described above will be explained. The water tank 1 is filled with water to a level L at which the rim part a, boss part b, and tread c, which are the parts to be inspected of the wheel M set on the turntable 2, are at a proper depth underwater. In FIG. 2, the wheel M is placed horizontally on the rail R so that its shaft hole, which is the center of rotation, is oriented vertically, and is conveyed in the direction of the arrow using a pusher cylinder (not shown) onto the turntable 2. is set to In this case, it is preferable to set the wheel M on the turntable 2 so that the center line of rotation of the wheel M coincides with that of the turntable 2 as much as possible.
If it is within the range of front and rear movement of the horizontal movement frame 8 allowed by While the wheels M are being set on the turntable 2 as described above, the lifting frame 5 is moved to the position shown by the phantom line in FIG. 1 by the retraction of the operating rod 6a of the vertical movement hydraulic cylinder 6. The horizontal movement frame 8 is also retracted to the support column 4 side due to the retraction of the operating rod 7a of the horizontal movement hydraulic cylinder 7.

When the setting of the wheel M on the turntable 2 is completed, the hydraulic cylinder 6 for vertical movement is actuated to extend the operating rod 6a by closing a limit switch (not shown) or visually confirmed by the operator, and the lifting frame is opened. 5 is lowered along the column 4, and when the probe unit C is substantially horizontally opposed to the tread surface c, and the probe units A and B are lowered to a predetermined height relative to the rim part a and the boss part b, The hydraulic cylinder 6 is stopped and the elevating frame 5 is stopped. Next, when the horizontal movement hydraulic cylinder 7 is activated to extend the operating rod 7a,
The operating rod 7a is connected to the slider 9 via a spring 10.
is pushed, and the horizontal moving frame 8 is pushed out toward the turntable 2 via the slider 9 and the hanging vertical shaft 11. The horizontal moving frame 8 has its horizontal frame portion 8
c is connected to the slider 9 via a spring 8d, and the spring 8d elastically supports the horizontal frame portion 8c in the same direction as the lifting frame 4, that is, toward the rotation center line of the turntable 2. If wheel M
are set substantially concentrically on the turntable 2, when the horizontal movement frame 8 is pushed out a certain length toward the turntable 2, the double copying rollers 15
a, 15a are brought into rolling contact with the tread c of the wheel M at approximately the same time, and each probe unit A, B, C is brought into contact with the rim part a, boss part b, and tread c of the wheel M, respectively, as shown in FIGS. They will be positioned facing each other with a predetermined separation dimension.

However, for example, if the wheel M is set on the turntable 2 with its rotational center line deviating from that of the turntable 2, first one of the copying rollers 15a is moved as shown by the imaginary line in FIG. When the horizontal moving frame 8 is further moved forward, since the copying roller 15a is already in rolling contact with the tread c of the wheel M, the horizontal moving frame 8 is moved by the spring 8d. (See FIG. 1), the rollers 15a, 15a are rotated in the direction of the arrow about the hanging vertical shaft 11 to the position shown by the solid line, and both the copying rollers 15a, 15a come into rolling contact with the tread surface c of the wheel M. When both copying rollers 15a, 15a roll into contact with the tread c, the horizontal frame portion 8c of the horizontally moving frame 8 is set to face the rotation center line of the wheel M, and each probe unit A, B, C is positioned opposite to the rim portion a, boss portion b, and tread c of the wheel M, respectively.

In this way, both copying rollers 15a, 15a
After both are brought into rolling contact with the tread surface c, the operating rod 7a is further extended slightly to cause the spring 10 to store an expanding force, and this expanding force causes both the copying rollers 15a, 15a to
In order to copy the tread surface c, both copying rollers 15a,
The horizontal movement hydraulic cylinder 7 is stopped with the 15a pressed against the tread surface c with an appropriate pressure. The turntable 2 is rotationally driven by a drive source (not shown) to cause the heavy wheels M to rotate together. The two copying rollers 15a, 15a follow the rotation of the wheel M by contacting the tread surface c of the wheel M, respectively, and making the probe units A, B, C face each flaw detection area. Ultrasonic waves are emitted from each of the probes constituting each of the probe units A, B, and C, and the ultrasonic waves are incident on each flaw-detecting portion of the wheel M using the water in the water tank 1 as a couplant. If there is a flaw in the area to be detected, the ultrasonic wave is reflected, travels through the water again, is captured by the probe, and the presence of the flaw is detected by the main body of the ultrasonic flaw detector (not shown).

In this way, flaw detection is performed by emitting ultrasonic waves at appropriate timing while the wheel M rotates once, and
When the turntable 2 rotates once, the drive source stops and the turntable 2 stops rotating. The rotation center of wheel M is turntable 2
Even if the tread c moves forward, backward, or left and right relative to the copying rollers 15a and 15a, the horizontal movement frame 8 is allowed to move back and forth by the spring 10. Since the horizontal movement frame 8 is allowed to rotate around the vertical shaft 11, both copying rollers 15a and 1
5a follows the above-mentioned relative movement in the longitudinal and lateral directions, and corrects the attitude of the horizontal movement frame 8 so that its tip always faces the center line of the wheel M, and each probe unit A, B, C is always kept at a predetermined position. Flaw detection is carried out by keeping the rim part a, boss part b, and tread c facing each other, which are the parts to be detected, separated by a distance of . When the wheel M rotates once, the drive source is stopped to stop the turntable 2, and at the same time, the horizontal movement hydraulic cylinder 7 is activated to retract the operating rod 7a, and the lifting hydraulic cylinder 6 is activated to move the operating rod. 6a is retracted, the horizontal movement frame 8 is retracted from the wheels M and raised;
Each of the probe units A, B, and C is evacuated to a position where the movement of the wheel M is not hindered. The pusher cylinder (not shown) is operated again to move the wheel M from the turntable 2 on the rail R in the direction of the outlined arrow, and at the same time, a new wheel M to be inspected next is set on the turntable. After the flaw detection has been completed, the wheel is lifted from the water tank 1 using a lifter (not shown).

As described above, in the present invention, the object to be detected is placed horizontally on the turntable, so the posture of the object is stabilized, and the horizontally movable frame to which each probe is attached is rotated relative to the elevator frame. A plurality of copying rollers are movable and are attached in a manner that allows forward and backward movement by an elastic member, and are caused to roll and press against the outer circumferential surface of the object to be inspected by the expanding force of the elastic member. The ability to follow the distance and direction of the object to be tested allows the probe to be held facing the part of the object to be tested on the turntable with a predetermined distance, which greatly improves flaw detection accuracy. It has excellent effects.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an embodiment of the present invention, Fig. 2 is a plan view thereof, Fig. 3 is an explanatory diagram of the operation of the main part, and Fig. 4 is a front view showing a conventional ultrasonic flaw detection device. . 2... Turntable, 5... Elevating frame, 6,7
...Hydraulic cylinder, 8...Horizontal movement frame, 10...
Spring, 15a... Copying roller.

Claims (1)

[Scope of utility model registration request] a turntable that supports a rotating object to be inspected underwater with its center of rotation oriented in a vertical direction; an elevating body that moves up and down with respect to the turntable;
This elevating body has a horizontal moving frame which is rotatable around a vertical axis and supported so as to be movable forward and backward relative to the center of the turntable, a probe unit attached to this horizontal moving frame, and this probe. A plurality of copying rollers are provided on both sides of the probe unit and are rolled into contact with the outer circumferential surface of the object to be tested, in order to hold the child unit facing the part to be tested at a required distance. An ultrasonic flaw detection device for a rotary object to be tested, comprising an elastic member that urges and holds a horizontally moving frame so as to follow the outer peripheral surface of the object to be tested and to direct the horizontally moving frame toward the center of the object to be tested. .