JPH0720220A - Device for detecting approaching object to traveling body - Google Patents

Abstract

PURPOSE:To ?provide a device for positively detecting an object approaching a traveling body. CONSTITUTION:A card-type transmitter 5 for radiating a weak radio wave is mounted to an object approaching a large traveling body 1 such as a dump track. The card-type transmitter 5 moves along with the object and radiates a weak radio wave from the position where the object exists. A receiver 7 for outputting a detection signal according to the detection of a weak radio wave from the card-type transmitter 5 is installed at the traveling body 1 and then an alarm is discharged toward an operator when a detection signal is outputted, thus preventing entanglement, etc., by the traveling body 1. It is desirable that the card-type transmitter 5 should be rotated around a pivotal shaft 14 on the object at right angle to the discharge direction of a weak current to eliminate the scattering of directivity of radiated radio wave in the card-type transmitter 5 and to make nearly identical the apparent radiated radio wave strength in the entire peripheral direction of the card-type transmitter 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for detecting an approaching object to a moving body, and particularly to prevent a moving body such as a large machine operating at a site such as civil engineering work from colliding with or contacting a person or a passenger car on the ground. The present invention relates to an approaching object detection device.

[0002]

2. Description of the Related Art Conventionally, in a site such as a civil engineering work where a large machine (hereinafter, sometimes referred to as a heavy machine) such as a dump truck, a crawler crane, a power shovel, etc. operates, a heavy machine is involved in a worker, etc. In order to prevent this from happening, people working near the heavy equipment were notified of the approach by the heavy equipment operator by wearing work clothes of a prominent color or ringing a horn. Similarly, in the case of passenger cars for patrols, for example, red and white checkered flags were always held and the horn was sounded when approaching heavy equipment.

Further, an ultrasonic sensor or an optical sensor for detecting an object is attached to the heavy equipment side, and an object approaching the heavy equipment is detected by these sensors to alert the heavy equipment operator. .

[0004]

The work clothes and flags having the prominent colors are appealing to the visual sense of the heavy equipment operator. However, the heavy equipment has a blind spot, and once the object enters the blind spot of the heavy equipment due to the carelessness of the operator of the heavy equipment, the approach of the object cannot be visually detected. Warnings by horns and horns appeal to the hearing of heavy machinery operators, but these alarms may also be buried in the noise of the construction site and may not be noticed by the heavy machinery operators and may not function as a warning.

An ultrasonic sensor or an optical sensor attached to a heavy machine is to supplement the detection omission of an approaching object by the sight and hearing of a heavy machine operator to some extent. However, the direction in which the sensor can detect is limited to the range peculiar to the sensor. Furthermore,
Since the detection range of the sensor also fluctuates as the heavy machine itself rotates, ascends and descends, and moves forward and backward, a blind spot may occur in which an approaching object cannot be detected.

Therefore, an object of the present invention is to provide a detection device for surely detecting an object approaching a moving body.

[0007]

Referring to FIG. 1, a moving object approaching apparatus for detecting a moving object according to the present invention is a card type which is attached to an object 3 which can approach a moving object 1 and which emits a weak radio wave. The transmitter 5 and the receiver 7 provided in the mobile unit 1 for outputting a detection signal in response to detection of a weak radio wave from the card-shaped transmitter 5 are provided.

Preferably, the card type transmitter 5 is rotated around a pivot shaft 14 on the object 3 which is perpendicular to the weak radio wave radiation direction 6.

[0009]

FIG. 1 shows an embodiment for detecting the approach of an object 3 such as a person 3a or a passenger car 3b to a moving body 1 such as heavy equipment in a work area of a large-scale earthwork site. A receiver 7 including an antenna is installed on the moving body 1, and a person 3a or a passenger car 3b in the work area
Install a card type transmitter (hereinafter sometimes referred to as a calling card) 5 to. The calling card 5 moves with the object 3 and emits a weak radio wave from the position where the object 3 is present. For example, if the helmet 4 worn by the person 3a or the ceiling of the passenger car 3b is used as in the illustrated example, the calling card 5 can be placed so as not to obstruct the movement of the object 3.

The transmitting card 5 is, for example, a business card-sized card that emits a weak radio wave in a predetermined frequency band, and belongs to the prior art. It is relatively easy to manufacture the transmission card 5 provided with an appropriate oscillator, amplifier, antenna, storage battery and the like. The weak radio wave output level of the calling card 5 is
The receiver 7 of the mobile unit 1 can detect the weak radio wave when the position of the object 3 is within a preset range with respect to the mobile unit 1, and does not interfere with other radio communication. Defined in the range. In the illustrated example, the object 3 is the moving body 1.
When it comes within the range of 3 to 15m, the receiver 7
Are set so that weak radio waves from the object 3 can be detected. However, it is desirable that the output size of the calling card 5 can be easily changed.

FIG. 1B shows a receiver 7 installed in the mobile unit 1.
An example will be shown. The antenna 8 is installed, for example, on the ceiling of the moving body 1 and is connected to the reception processing device 9 in the heavy machine pilot seat. When a signal having a certain level or more is received by the antenna 8, the reception processing device 9 performs, for example, necessary amplification processing and frequency determination, and outputs a detection signal when the frequency of the received signal is in the frequency band of the calling card 5. To do. In the illustrated example, an alarm device 11 is connected to the reception processing device 9 via a multiplexer 10, and an alarm indicating that the approaching object 3 is present is output to the heavy equipment operator. It is also possible to connect the reception processing device 9 to the brake or power system of the moving body 1 and automatically stop the movement of the moving body 1 by using the detection signal as a trigger signal. The multiplexer 10 of the illustrated example uses the antenna 8 when there are a plurality of objects 3 that use different weak radio waves in the work area.
The reception processing device 9 processes a plurality of different reception radio waves received in step S1, and outputs the detection signals sequentially as detection signals. The use of the multiplexer 10 makes it possible to identify a large number of objects 3 individually and to reliably detect their approach.

According to the present invention, the approach of the object 3 can be detected with certainty, and there is no possibility that an undetectable direction may occur depending on the movement mode of the moving body 1.

Therefore, it is possible to achieve the object of the present invention to provide a "detection device for surely detecting an object approaching a moving body".

Preferably, as shown in FIG. 2, a weak radio wave is radiated while rotating the transmitting card 5 around the pivot shaft 14 on the object 3. In this case, weak radio waves are strongly radiated from the calling card 5 in a specific radiation direction 6, for example, the θ direction shown in FIG. 2B, and the pivot 14 is provided so as to be orthogonal to the radiation direction 6. When the moving body 1 is in the radiation direction 6 as viewed from the transmission card 5 of the object 3, the receiver 7 can receive the weak radio wave from the moving body 3 with high sensitivity, but when it is in another direction, the sensitivity is low. Will fall. If the directivity of the radio wave radiation, that is, the angle θ in FIG. 2B varies depending on the calling card 5, the approach detection also varies, which is inconvenient. However, if the radio wave is radiated while rotating the transmitting card 5 around the pivot shaft 14, the above-mentioned inconvenience due to the variation in the directivity of the radio wave radiation can be solved. According to an experiment by the present inventor, by rotating the calling card 5 at 30 rpm by the rotating means 15, the sensitivity in all directions can be made substantially the same regardless of the directivity of the individual calling card 5. did it. Further, when the calling card 5 is rotated, the electric wave transmission from the calling card 5 is intermittently performed on condition that the calling card 5 is secured in all directions and the detection delay by the receiver 7 is minimized. It is also possible to reduce the load on the power supply.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1C shows an embodiment of a weak radio wave radiation unit 24 of the present invention which can be mounted on various moving bodies 3, and is pivotally supported on an axis 14 perpendicular to a weak radio wave radiation direction 6. The transmitting card 5, the rotating means 15 for rotating the transmitting card 5 around the pivot shaft 14, and the attaching means 13 for detachably attaching one end of the pivot shaft 14 to a predetermined position on the moving body 3. The weak radio wave radiating unit 24 in the illustrated example has a transparent cover that covers the transmitting card 5 and the rotating means 15, and protects the transmitting card 5 from an external impact. Further, in the illustrated example, the mounting means 13
The bottom surface of the is a suction surface, and the radiation unit 24 is attached to the helmet 4 or the body of the passenger car 3b of the worker who enters the work area where the heavy equipment operates (see FIG. 1 (A)). It can be removed.

FIG. 3B shows a storage means for storing the detection signal.
20 and output means for outputting the signal stored in the storage means 20
Shown is the receiver 7 in contact with 21. The signal received by the mobile unit 1 is transmitted to the heavy equipment operator in real time through the alarm device 11 and stored in the storage means 20. For example, after the work of one day is completed, the information of the approaching object 3 stored in the storage means 20 can be read out by the output means 21 and used as the material for safety management.

A fixed reference position 3c in the work area shown in FIG.
3B shows the received signal when the mobile card 1 approaches the reference position 3c by mounting the transmission card 5 having a narrow range of radiated radio waves on the
If it records using the receiver 7 of this, operation management of the mobile body 1 can be performed. That is, entrance gate (point 1)
Emission cards 5 with different radiated radio waves are attached in advance to management points such as a repair shop (point n), and the radiated radio waves of each transmission card 5 are received when the mobile body 1 such as a dump truck passes near each management point. And storage means 20
Remember. Based on the signal stored in the storage means 20,
The operation route of the moving body 1 can be known by detecting which of the reference positions 3c around which the moving body 1 has entered. It is also possible to make a more efficient operation management / operation plan based on the signals stored in the storage means 20.

In the present invention, the receiver 7 and the calling card 5 are attached to the moving body 1 and the object 3, respectively. However, the calling card 5 may be installed in the moving body 1 and the receiver 7 may be installed in the handling object 3 depending on the application. Is.

[0019]

As described in detail above, the apparatus for detecting an object approaching a moving body according to the present invention is a card type transmitter attached to an object and emitting a weak radio wave, and a radio wave provided on the mobile body. Since a configuration including a receiver that outputs a detection signal in response to detection of is used, the following remarkable effects are achieved.

(1) Even when the object enters the mechanical blind spot of the moving body, the approach of the object can be electrically detected. (2) It is possible to reliably detect the approach of the object regardless of the moving mode of the moving body. (3) The reliable detection of the approaching object can be expected to prevent collision or contact between the moving body and the object. (4) By rotating the card type transmitter, it is possible to apparently eliminate variations in the directivity of radiated radio waves in the card type transmitter. (5) The operation of the moving body can be managed by recording the radio waves radiated from the card type transmitter.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an embodiment of the present invention.

FIG. 2 is an explanatory view showing the operation of the present invention.

FIG. 3 is an explanatory diagram of another embodiment of the present invention.

[Explanation of symbols]

1 Moving object 3 Object 3a
Person 3b passenger car 3c reference position 4
Helmet 5 Card type transmitter 6 Direction of weak radio wave emission 7
Receiver 8 Antenna 9 Reception processing device 10
Multiplexer 11 Alarm device 12 Battery 13
Mounting means 14 Pivot shaft 15 Rotating means 20
Recording means 21 Output means 24 Weak radio wave emission unit.

Claims (6)

[Claims] 1. A card type transmitter attached to an object that can approach a moving body and radiating a weak electric wave, and a detection signal provided in the moving body according to detection of a weak electric wave from the card type transmitter. An object detection device for approaching a moving body, comprising a receiver for outputting. 2. The approaching object detection device according to claim 1, wherein the card-shaped transmitter is rotated around a pivot axis on the object perpendicular to the weak radio wave radiation direction. Approaching object detection device. 3. The approaching object detection device according to claim 1 or 2, wherein the receiver is provided with storage means for storing the detection signal and output means for outputting a signal stored in the storage means. Object detection device for approaching moving objects. 4. A card type transmitter pivotally supported on an axis perpendicular to a direction of emitting a weak electric wave, a rotating means for rotating the card type transmitter around the pivot shaft, and one end of the pivot shaft. Weak radio wave radiation unit, which is equipped with an attachment means for detachably attaching the object to an object. 5. A mobile unit is provided with a receiver that mounts a card type transmitter that emits a weak radio wave having a narrow reach at a reference position and outputs a detection signal in response to detection of a weak radio wave from the card type transmitter. , The storage means for storing the detection signal is provided in the receiver, and the moving body is detected by detecting the invasion of the moving body from the reference position into the reachable range based on the signal stored in the storage means. A mobile operation management method that manages the operation. 6. The mobile operation management method according to claim 5, wherein the card-shaped transmitter is rotated around a pivot axis perpendicular to the weak radio wave radiation direction at the reference position. .