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JPS5731299

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DESCRIPTION JPS5731299
Description 1, title of the invention
Transducer for electromagnetic ultrasonic deep wound device
2. Detailed Description of the Invention The present invention relates to a probe for an ultrasonic
measuring instrument (hereinafter referred to as an electromagnetic ultrasonic flaw detector)
which generates or detects an ultrasonic wave by an electromagnetic coupling method. The
structure of a conventional electromagnetic ultrasonic flaw detector will be described with
reference to the sectional view of FIG. 1 and the bottom view of FIG. In the figure, 1 is a bottom
core, 31 is a peripheral iron core, No. is a central leg iron core, a toroidal iron core is constituted
by these, 2 is a DC exciting coil wound around the central leg iron core 4 and the members 1 to 4
Thus, a DC electromagnet is configured. The tip of the central leg iron core 4 is preferably
squeezed as shown in the figure, and a non-conductive protective case 6 for protecting the
ultrasonic transmission / reception coil 5 and the coil 5 is attached to the tip. Is a lead wire of the
transmitting and receiving coil 5. In the manufacture, the bottom iron core 1 and the central leg
iron core 4 are integrally formed, the direct current excitation coil 2 is mounted on the central
leg iron core 4, and the ultrasonic transmitting / receiving coil 5 and the protective case 6 are
sequentially stacked. Thereafter, the peripheral iron core 3 is generally welded to the bottom
core 1 in a state where the ultrasonic transmitting and receiving coil 5 and the protective case 6
are pressed toward the central leg iron core 4 by the peripheral iron core 3. EndPage: 1 As the
material of the protective case 6, many non-magnetic, non-conductive ceramic and polycarbonate
crabs are used. In the above configuration in which 11 in FIG. 1 is the test material, the DC
excitation coil 2 is excited by a DC power supply (not shown) to apply a DC magnetic field to the
test material 11, and then to the transmission / reception coil 5. When a pulse current is applied
from a pulse generator (not shown), as is well known, a changing magnetic flux is generated in
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the test material 11, and an eddy current is generated in the test material 11 in the changing
magnetic flux. Do. Due to the interaction between the eddy current and the DC magnetic field
given in advance, change strain (according to Fleming's law) is generated in the test material. The
change strain propagates in the sample Al as ultrasonic waves. Defects in the width of the test
material 11 and reflected ultrasonic waves from the bottom surface are detected by the
transmission / reception “il” 5 in the process reverse to the above. As described above, the tip
of the central leg 4 is squeezed in order to obtain a DC magnetic field as high as possible. In the
conventional electromagnetic ultrasonic flaw detection apparatus as described above, the
nonmagnetic, nonconductive protective case 6 of the ultrasonic transmission / reception coil 5
uses a thin one of about 0.51 in order to keep the flaw detection sensitivity sufficiently high. Be
Therefore, the protective case 6 is mechanically weak, and is dented, damaged, or islanded due to
the unevenness of the surface of the test material 110, which causes the coil 5 to be broken and
a screwing accident easily occurs.
Thus, when disconnection or short circuit of the coil 5 occurs, it is possible to replace the coil 1 1
However, as is clear from the above description, in the configuration of FIG. It is necessary to
remove the welds of iron cores 1 and 3 and virtually impossible. Although it is conceivable to
press and fix the coil 5 with the protective case 6 instead of suppressing and fixing the coil 5 and
the protective case 6 with the peripheral wall iron core 3 in order to improve this point, the
thickness of the peripheral wall iron core 3 is thin Because the mechanical strength of Case 6 is
not sufficient, such an alternative is almost impossible. The present invention has been made to
eliminate the above-mentioned drawbacks of the prior art), making the most mechanically weak
transmit / receive coil detachable, and if the transmit / receive coil is broken, KI / i, transmit /
receive Only the coil can be easily replaced. 3 and 4 show a cross-sectional view of one
embodiment of the present invention and a detailed cross-sectional view of the transmitting and
receiving coil. In FIG. 3, the same reference numerals as in FIGS. 1 and 2 denote the same or Lequivalent parts. 13 is a nonmagnetic, nonconductive pressing plate of the DC exciting coil 2, 14
is a transmitting / receiving coil assembly, 15 is a ring-shaped coil pressing plate, 16 is a socket
receiving recess provided at the tip of the central leg iron core 4, 17 is Reference numeral 18
denotes a screw, 22 denotes a contact terminal of the coil 5, and 23.24 denotes non-conductive
coil protectors disposed on the upper and lower surfaces of the film 5. In the manufacture of the
apparatus shown in FIG. 3, first, the bottom core 1 and the central leg core 4 are integrally
formed, the DC coil 2 is mounted on the central leg core 4 and the coil 2 is pressed by the
holding plate 13 The peripheral wall iron core 3 is welded to constitute a DC electromagnet. On
the other hand, after the transmitting and receiving coil 5 is formed on a nonconductive
protective material (substrate) 23 such as ceramic or polycarbonate by winding or printed wiring
technology and attached to the contact terminal 22, these protective foils 23 and A covering
material 24 made of the same material is integrally covered to form a transmitting and receiving
coil assembly 14. The transmitting and receiving coil assembly 14 is brought into contact
engagement with the socket 17 provided in the socket receiving recess 16 at the tip of the
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central leg 4 as shown in FIG. The core leg 4 is inserted into the tip of the core 4 and pressed by
a ring-shaped fill presser plate 15 and fixed with a screw 18. Since the contactor of the
electromagnetic ultrasonic flaw detector according to the present invention has a configuration
on a cedar, if the transmitting and receiving coil 5 is broken by a concave line or an impact of the
test material, the pressing plate 1 is removed to make a transmission Coil assembly 14t-Pull out,
can be easily replaced even at the site of use 0
4. Brief description of the drawings. FIG. 1 is a sectional view of a conventional probe for an
electromagnetic ultrasonic flaw detector, FIG. 2 is a bottom view thereof, and FIG. 3 is a sectional
view of an embodiment of the present invention, The figure is a cross-sectional view of the
transmission / reception carp EndPage: 2 assembly of the present invention. Reference Signs List
2 DC excitation coil 5 ultrasonic transmission / reception coil 13 pressing plate 14 transmission
/ reception coil assembly 15 coil pressing plate 16 socket accommodation recess 17 ... socket, 22
... contact terminal. Agent Patent Attorney Michihito Hiraki Fig. 1 Fig. 2 Fig. 4 EndPage: 3
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