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DESCRIPTION JPH04109363

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DESCRIPTION JPH04109363
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
probe pressing device of an ultrasonic flaw detector.
[0002]
2. Description of the Related Art An ultrasonic flaw detector is widely used as a nondestructive
inspection device because the flaw detection portion is relatively small and easy to carry. The
probe that oscillates and sends out ultrasonic waves and receives this reflected wave inserts the
liquid between it and the surface to be measured to improve the transmission of ultrasonic
waves, but the contact surface of the probe to the surface to be measured Is required to be in
close contact with the surface to be measured, that is, to press the probe perpendicularly to the
surface of the object in order to improve flaw detection accuracy.
[0003]
By the way, in recent years, robots have come to be used for inspection work in places with poor
work environment such as work under radiation, and ultrasonic flaw detection such as piping
and pressure vessels It is widely used for inspections and the like. In the past, when an operator
pressed a probe against piping or the like to perform an ultrasonic inspection, the operator hit
the probe vertically to the surface to be inspected, but in the case of a robot, it should be
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vertically applied. Very difficult. This is because the surface to be inspected is not necessarily a
flat surface, and in many cases it is smooth but uneven, such as a cylindrical surface, and it is
extremely difficult to inspect the inspection area while placing the probe vertically along such a
surface. There were times when it was difficult.
[0004]
The present invention has been made in view of the above problems, and it is an object of the
present invention to provide a probe pressing device for bringing a probe into vertical contact
with a surface to be inspected even in the case of simple pressing by a robot or the like. To aim.
[0005]
SUMMARY OF THE INVENTION In order to achieve the above object, the present invention has a
top, a bottom having a probe opening at the center and a bottom leg at the bottom, and the
bottom and the top A movable body having a vertically-connected connector, a movable body
which slidably penetrates the connector and has a probe opening at the center and which
slidably penetrates the bottom on the lower surface; A moving body pressing spring provided
between the upper surface of the body and the lower surface of the top, a head portion of the
lower surface of the lower surface, and a head of the probe provided at the probe opening of the
moving member and entering the probe opening And a probe presser spring for pressing the
probe.
Note that these components are gently held approximately perpendicular to the surface to be
inspected by guide hardware or the like.
[0006]
According to the above configuration, the bottom leg is in contact with the surface to be
inspected by the force received from the robot or the like in the direction substantially
perpendicular to the surface to be inspected through the top. Further, when the moving body leg
contacts the surface to be inspected by this force, the moving body is pushed up, whereby the
moving body pushes up the top through the moving body pressing spring. Then, the reaction
force of the moving body pressing spring is applied to the moving body, and this force is
transmitted to the moving body leg. As a result, when each pair of left and right or front and rear
pairs is in contact with only one surface to be examined, the force received through the top acts
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so that both legs are in contact, and it comprises the top, the connector and the bottom The
structure is approximately perpendicular to the surface to be inspected. Since the probe is in the
movable body opening and the bottom opening which are open at the center of this structure and
the head is pressed by the probe holding spring, it is pressed perpendicularly to the surface to be
inspected become.
[0007]
Embodiments of the present invention will now be described with reference to the drawings. FIG.
1 is a perspective view of the present embodiment, and is represented somewhat schematically to
facilitate understanding. FIG. 2 is a diagram showing the relationship with the guide hardware of
this embodiment. First, the overall relationship will be described with reference to FIG. FIG. 2
shows a state in which the present embodiment is pulled up to show the relationship between the
present embodiment and the guide hardware. However, in use, the present embodiment enters
the guide hardware and is in a state where the top is taken out. In FIG. 2, reference numeral 10
denotes a guide metal, and the guide pins 11 provided at a pitch of 90 degrees in the present
embodiment are slid by the guide grooves 12 to obtain a roughly vertical position. The guide
hardware 10 is moved by the robot in the direction indicated by the arrow H. The gap between
the guide pin 11 and the guide groove 12 is made large to some extent so as not to affect the
operation of this embodiment described below.
[0008]
In FIG. 1, 1 is the top, to which vertical force P and horizontal force R are applied by the robot. At
the bottom, the center of the bottom is the same diameter as the diameter of the probe but has a
slidable opening, and two bottom legs 3 are attached to the lower surface 180 degrees apart. A
connecting rod 4 connects the top 1 and the bottom 2 and consists of two rods 180 degrees
apart. The reference numeral 5 is a movable body for slidingly penetrating the connecting rod 4,
moving between the top 1 and the bottom 2 and moving the movable body leg 6 at a position
180 degrees apart from the lower surface and orthogonal to the lower leg 3. It is provided.
Reference numeral 7 denotes a movable body pressing spring, which is provided between the
lower surface of the top 1 and the upper surface of the movable body 5 and on the inner
peripheral side of the two connecting rods 4. A probe pressing spring 8 is attached to the center
of the lower surface of the top 1 by pressing the head of the probe 9 to press the probe against
the surface to be inspected.
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[0009]
Next, the operation will be described. The guide metal 10 is moved in the arrow H direction by
the horizontal force R from the robot and stops at a predetermined position on the surface to be
inspected. Next, when a vertical force P is applied by the robot, at least one of the two bottom
legs 3 comes in contact with the surface to be inspected. Furthermore, due to the vertical force P,
the other bottom leg also strikes the surface to be examined. In addition, at least one of the
movable body legs 6 also comes into contact with the surface to be inspected. When the one
movable body leg 6 hits, the movable body 5 is pushed up, thereby generating a reaction force of
the movable body pressing spring 7 so that the movable body 5 is pushed down and the other
movable body leg 6 also hits the inspection target surface. As a result, the entire probe pressing
device becomes perpendicular to the surface to be inspected. Accordingly, the probe 9 attached
at the center of the probe pressing device is also pressed by the probe pressing spring 8
perpendicularly to the surface to be inspected, so that ultrasonic flaw inspection can be
performed with high accuracy.
[0010]
As is apparent from the above description, the present invention adjusts the entire apparatus so
as to be perpendicular to the target inspection surface, since the present invention holds the
moving body moving between the top and the bottom with a spring. Ultrasonic flaw detection
can be performed with high accuracy by a probe installed at the center of this device.
[0011]
Brief description of the drawings
[0012]
1 is a perspective view showing the configuration of an embodiment of the present invention.
[0013]
2 is a diagram for explaining the present embodiment and the arrangement of the guide
hardware.
[0014]
Explanation of sign
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[0015]
Reference Signs List 1 top 2 bottom 3 bottom leg 4 connecting rod 5 moving body 6 moving
body leg 7 moving body pressing spring 8 probe pressing spring 9 probe 10 guide metal 11
guide pin 12 guide groove
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