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DESCRIPTION JPH02193092

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DESCRIPTION JPH02193092
[0001]
(Industrial field of application) The present invention relates to an ultrasonic wave that a
construction machine such as a crane, a hydraulic shovel or a construction vehicle approaches an
object such as a construction machine, a worker, an electric wire or a structure abnormally. The
present invention relates to a construction site ultrasonic receiver for receiving in the air
ultrasonic waves transmitted from an ultrasonic transmitter in an apparatus for (Conventional
technology) Conventionally, a device that detects abnormal approach between a construction
machine and an object by ultrasonic waves at a construction site emits ultrasonic waves and
receives a reflected wave from the object to measure the distance to the object The alarm was
issued when it was in the dangerous range by measuring (see, for example, JP-A-59-26893).
However, in such a device, the reflected wave of the ultrasonic wave from the object is strongly
attenuated, so that there is a disadvantage that there is a limit to what can be measured and the
distance. Therefore, recently, a method using another device has been attempted by the present
inventor. In this method, a transmitter or a receiver is provided for the construction machine and
the object, the transmitter and the receiver are synchronized by radio waves, and the time when
ultrasonic waves emitted from the transmitter reach the receiver is detected. Then, by measuring
the distance between the construction machine and the object, an alarm will be issued when it is
within the dangerous range. By the way, in such a construction site, machines and people are
always moving, and in order to know their positions, it is necessary to receive ultrasonic waves
coming from all directions. However, the conventional ultrasonic wave receiver has sharp
directivity only in the direction perpendicular to the wave receiving surface of the ultrasonic
transducer, and is not suitable for receiving ultrasonic waves coming from all directions. Then,
this invention aims at providing the ultrasound receiver for construction sites which can receive
the ultrasonic wave which comes from all directions by having omnidirectionality. (Means for
Solving the Problems) In order to achieve two objects, the construction site ultrasonic wave
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receiver of the first invention is provided on a construction machine or an object to convert
ultrasonic waves into electrical signals. An ultrasonic transducer that converts, a receiving circuit
that detects an electrical signal obtained from the ultrasonic transducer, and a reflection surface
that has a reflecting surface that reflects ultrasonic waves coming from all directions to the
receiving surface of the ultrasonic transducer. The gist of the present invention is that it
comprises an acoustic reflector. In the ultrasonic wave receiver for construction site according to
the second aspect of the present invention, in the first aspect, the ultrasonic reflector has a
through hole in a direction perpendicular to the wave receiving surface of the ultrasonic
transducer. . Further, according to the ultrasonic wave receiver for construction site of the third
invention, in the first and second inventions, the ultrasonic wave reflector is used as a first
ultrasonic wave reflector, and from the first ultrasonic wave reflector It has a second ultrasonic
reflector provided with a reflecting surface for reflecting an incoming ultrasonic wave to a
receiving surface of the ultrasonic transducer, and the reflecting surface is provided at a position
surrounding the receiving surface of the ultrasonic transducer. Make it a gist.
(Operation) In the construction site ultrasonic wave receiver according to any of the first to third
inventions, the ultrasonic waves coming from all directions are reflected by the reflection surface
of the ultrasonic wave reflector to the wave receiving surface of the ultrasonic wave vibrator. In
the construction site ultrasonic wave receiver according to the second aspect of the present
invention, the ultrasonic wave coming from the direction perpendicular to the wave receiving
surface of the ultrasonic transducer is made incident from the through hole of the ultrasonic
wave reflector. In the construction site ultrasonic wave receiver of the third invention, the second
ultrasonic wave reflector reflects the ultrasonic wave coming from the first ultrasonic wave
reflector to the wave receiving surface of the ultrasonic wave vibrator. Furthermore, in the first
to third inventions, the ultrasonic wave that has reached the receiving surface of the ultrasonic
transducer is converted into an electrical signal by the ultrasonic transducer and detected by the
receiving circuit. (Embodiment) FIG. 1 is a perspective view showing an embodiment of a
construction site ultrasonic wave receiver according to the first invention. The construction site
ultrasonic wave receiver 10 basically has an ultrasonic transducer 11 receiving circuit 12 and an
ultrasonic wave reflector 13. The ultrasonic transducer 11 is attached to the receiving circuit 12
housed in a housing with the delivery surface 14 on the outside. The ultrasonic reflector 13 has,
for example, a conical shape as shown in the figure and a reflecting surface 15 made of a
material such as metal which easily reflects ultrasonic waves. Then, at a position at which the
ultrasonic waves arriving from all directions are reflected to the delivery surface 14 of the
ultrasonic transducer 11, they are fixed by a support (not shown). FIG. 2 is a cross-sectional view
taken along line 1-- shown in FIG. The ultrasound reflector 13 has a cone shape, and when the
ultrasound 16 arrives from all directions, it is reflected by the reflection surface 15 to the
receiving surface 14 of the ultrasound transducer 11. Therefore, the construction site ultrasonic
wave receiver IO is omnidirectional and can receive ultrasonic waves coming from all directions.
The ultrasonic reflector 13 may be in the shape of a cone such as a cone or a pyramid and may
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be hollow. The reflecting surface 15 may be any of a convex surface, a flat surface, and a concave
surface. In the case of a convex surface, a wide range of ultrasonic waves can be reflected to the
delivery surface 14. In the case of a plane, manufacture is easy. In the case of a concave surface,
the ultrasonic waves can be converged and reflected to the delivery surface 14. The reflecting
surface 15 can also be divided into an upper portion, a middle portion, and a lower portion, and
each of them can be formed as a convex surface, a flat surface, or a concave surface.
Furthermore, although not shown, it goes without saying that there are ultrasonic waves directly
incident on the delivery surface 14 without passing through the ultrasonic reflector 13. FIG. 3 is
a perspective view showing an embodiment of a construction site ultrasonic wave receiver of the
second invention. The same parts as those in FIG. The ultrasonic reflector 30 has a through hole
31 in a direction perpendicular to the wave receiving surface 14 of the ultrasonic transducer 11.
FIG. 4 is a cross-sectional view taken along line IV-IV shown in FIG. In order to form a vertebral
body, when the ultrasonic wave 16 arrives from all directions, the ultrasonic wave reflector 30 is
reflected by the reflecting surface 15 to the delivery surface 14 of the ultrasonic wave vibrator
11. Further, the ultrasonic wave 32 coming from the direction perpendicular to the delivery
surface 14 of the ultrasonic transducer 11 is directly incident on the wave receiving surface 14
from the through hole 31. Alternatively, the ultrasonic wave 32 is reflected by the reflection
surface 33 of the through hole 31 to the wave receiving surface 14. Therefore, this construction
site ultrasonic receiver 34 has nondirectionality, and in particular, ultrasonic waves coming from
all directions including ultrasonic waves 32 coming from a direction perpendicular to the passing
surface 14 of the ultrasonic transducer 11 I can receive it. FIG. 5 is a perspective view showing
an embodiment of a construction site ultrasonic wave receiver of the third invention. The same
parts as those in FIG. The second ultrasonic reflector 40 has a reflection surface 41 for reflecting
the ultrasonic wave coming from the first ultrasonic reflector 13 to the delivery surface 14 of the
ultrasonic transducer 11, and the reflection surface 41 is a delivery surface 14. Is provided at a
position surrounding the The reflecting surface 41 has, for example, an inner surface of a
pyramid as illustrated. 6 is a cross-sectional view taken along the line Vl-Vl shown in FIG. The
ultrasonic wave 16 coming from all directions is reflected by the reflective surface 15 of the first
ultrasonic reflector 13 to the delivery surface 14 of the ultrasonic transducer 11 and reflected to
the reflective surface 41 of the second ultrasonic reflector 40. Let In the second ultrasonic
reflector 40, the ultrasonic wave coming from the first ultrasonic reflector 13 is reflected by the
reflection surface 41 to the delivery surface 14. Therefore, this construction site ultrasonic wave
receiver 42 is omnidirectional and can receive ultrasonic waves coming from all directions.
Furthermore, the reflection surface 15 of the first ultrasonic reflector 13 is enlarged to increase
the reflection amount of the ultrasonic waves, and the reflection surface 41 of the second
ultrasonic reflector 40 transmits the ultrasonic wave to the delivery surface 14 of the ultrasonic
transducer 11. By reflecting, the reception intensity of the ultrasonic transducer 11 can be easily
increased. The ultrasonic reflector 40 also functions to block unnecessary ultrasonic waves from
the lower side in the drawing. The reflection surface 41 of the ultrasonic reflector 40 has an
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inner surface of a cone such as a cone or a pyramid, and may be any of a convex surface, a flat
surface, and a concave surface. Furthermore, the first ultrasonic reflector 13 may be an
ultrasonic reflector 30 having a through hole 31 in FIG. In the first to third embodiments of the
present invention, the ultrasonic reflector is in the shape of a cone, but is not limited to this. For
example, the ultrasonic reflector may be formed of a plurality of plate members.
FIG. 7 is a bird's-eye view showing an example of use of the construction site ultrasonic wave
receiver (hereinafter referred to as an ultrasonic wave receiver) of the present invention. An
ultrasonic transmitter 52 is attached to a hook portion of a crane 50.51 which is a construction
machine, and an ultrasonic receiver 10 (34, 42) is attached to a helmet of a work implement
53.54 which is an object. The ultrasonic wave receiver 10 (34, 42) includes an alarm member 55
such as a buzzer or a display lamp, and issues an alarm when the distance to the ultrasonic wave
transmitter 52 falls within the dangerous range. Radio waves are intermittently transmitted from
the radio wave transmission antenna 61 installed on the roof of the management building 60,
and the radio wave reception circuit installed in the ultrasonic wave transmitter 52 and the
ultrasonic wave receiver 10 (34, 42) The radio wave is received and the ultrasonic wave receiver
52 and the ultrasonic wave receiver 10 (34, 42) are synchronized. Next, to describe an example
of the operation, the ultrasonic wave transmitter 52 and the ultrasonic wave receiver 10 (34, 42)
are synchronized by the radio wave transmitted from the radio wave transmission antenna 61
and from the ultrasonic wave transmitter 52. The ultrasound is transmitted. The hedge sound
wave receiver LQ (34, 42) detects the time from the reception of radio waves to the reception of
the ultrasonic waves, whereby the distance to the ultrasonic wave transmitter 52, ie, the hooks of
the cranes 50, 51. Know the distance between department and worker 53.54. If the distance is
within the danger range, a warning will be issued and safe work can be performed. Also, the hook
portion of the crane 50.51 and the worker 53.54 are constantly moving, and the ultrasonic
receiver 10 (34, 42) needs to receive ultrasonic waves coming from all directions, but As a
matter of fact, this ultrasonic receiver fully satisfies the conditions. Of course, the ultrasonic wave
receiver 10 (34, 42) may be attached to the crane 50.51, and the ultrasonic wave transmitter 52
may be attached to the working tool 53.54. (Effects of the Invention) As described above,
according to the construction site ultrasonic wave receiver of the first to third inventions, the
ultrasonic transducer coming from all directions is reflected by the reflection surface of the
ultrasonic wave reflector. Thus, it is possible to receive ultrasonic waves coming from all
directions. Also, according to the construction site ultrasonic wave receiver of the second
invention, the ultrasonic wave coming from the direction perpendicular to the wave receiving
surface of the ultrasonic wave vibrator can be received by the through hole provided in the
ultrasonic wave reflector. it can. Further, according to the construction site ultrasonic wave
receiver of the third invention, since the ultrasonic wave is received by the first ultrasonic wave
reflector and the second ultrasonic wave reflector, the ultrasonic wave vibrator receives the
ultrasonic wave. The second ultrasonic reflector and the second ultrasonic reflector can block
unnecessary ultrasonic waves.
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[0002]
Brief description of the drawings
[0003]
FIG. 1 is a perspective view showing an embodiment of the ultrasonic wave receiver for a
construction site according to the first invention, FIG. 2 is a sectional view taken along the line n-shown in FIG. 1, and FIG. 3 is a construction site according to the second invention. 4 is a crosssectional view taken along the line IV-IV shown in FIG. 3, and FIG. 5 is an embodiment of a
construction site ultrasonic receiver according to the third invention. 6 is a sectional view taken
along the line Vl-Vl shown in FIG. 5, and FIG. 7 is a bird's-eye view showing an example of use of
the construction site ultrasonic wave receiver according to the present invention.
10.34.42. Ultrasonic wave receiver 11 for construction site иии Ultrasonic transducer 14 иии Wave
receiving surface 12 of ultrasonic transducer иии Receiving circuit 16.32 иии Ultrasonic 13.30. 40:
Ultrasonic reflector 15.33.41: Reflective surface of ultrasonic reflector 31: Through hole 50.51:
Crane (construction machine) 53.54: Worker patent application Person F-Bure Co., Ltd. Attorney
Attorney Yoshi 1) Houharu Figure 3 Figure 6
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