JP3026702B2 - Device for detecting objects approaching moving objects - Google Patents

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 object approaching a moving object, and more particularly, to preventing collision or contact between a moving object such as a large machine operating at a site such as civil engineering work and a person or a passenger car in the site. To an approaching object detecting device.

[0002]

2. Description of the Related Art Conventionally, on the site of civil engineering work where large machines such as dump trucks, crawler cranes, and power shovels operate (hereinafter sometimes referred to as "heavy machines"), workers and other heavy machines are involved in a serious disaster. In order to prevent this, people working near the heavy equipment were wearing noticeable colored work clothes and sounding a horn to notify the operator of the heavy equipment. Similarly, in the case of a patrol passenger car, for example, a red and white checkered flag is always raised and a horn is sounded when traveling or approaching a heavy machine.

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

[0004]

The work clothes and flags of the above-mentioned prominent colors appeal to the operator of the heavy equipment. However, heavy equipment has a blind spot, and once the target enters the blind spot of the heavy equipment due to the carelessness of the operator of the heavy equipment, the approach of the target cannot be visually detected. Warnings from horns and horns appeal to the hearing of heavy equipment operators, but these warnings are sometimes buried in the noise of construction sites and do not function as warnings without notice.

[0005] Ultrasonic sensors and optical sensors mounted on heavy equipment compensate to some extent omission of detection of an approaching object by the operator of the heavy equipment by visual and auditory senses. However, the direction in which the sensor can detect is limited to a range specific to the sensor. Furthermore,
Since the detection range of the sensor also fluctuates with the rotation operation, the lifting operation, the forward / backward operation, and the like of the heavy equipment itself, a blind spot where an approaching object cannot be detected may occur.

Accordingly, an object of the present invention is to provide a large construction machine or the like.
Object approaching a moving object is turned into a weak radio wave from the moving object
It is an object of the present invention to provide a detection device for more reliably detecting.

[0007]

Referring to FIG. 1, an apparatus for detecting an object approaching a moving object according to the present invention includes a pivot shaft 14 provided on an object 3 which can approach the moving object 1; Rotation of pivot 14
A card-type transmitter 5 which is rotated in a direction perpendicular to the pivot 14 and emits a weak radio wave, and a detection signal is output in response to the detection of the weak radio wave from the card-type transmitter 5 provided in the moving body 1. A receiver 7 is provided.

[0008] Preferably , a card-type transmitter on the object 3
In order to provide the card 5, the card-type transmitter 5 is rotated around the pivot shaft 14.
Rotation means 15 and one end of the pivot shaft 14 to the object.
Weak radio emission with detachable mounting means 13
The firing unit 24 is used .

[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 a heavy machine 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 is set.
, A card-type transmitter (hereinafter sometimes referred to as a transmission card) 5 is attached. The sending card 5 moves together with the target 3 and emits a weak radio wave from the position where the target 3 is located. 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 transmission card 5 can be placed so as not to hinder the movement of the object 3.

The transmission card 5 is, for example, a business card size card that emits a weak radio wave in a predetermined frequency band, and belongs to the prior art. The transmission card 5 provided with an appropriate oscillator, amplifier, antenna, storage battery, and the like can be manufactured relatively easily. The weak radio wave output level of the calling card 5 is
When the position of the object 3 is within the range set in advance with respect to the mobile unit 1, the receiver 7 of the mobile unit 1 can detect the weak radio wave, and does not hinder other radio wave communication. Range. In the illustrated example, the object 3 is the moving object 1
When it comes within the range of 3 to 15 m, the receiver 7
Is set to detect weak radio waves from the object 3. However, it is desirable that the magnitude of the output 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 described. The antenna 8 is installed, for example, on the ceiling of the mobile unit 1 and connected to the reception processing device 9 in the cockpit of the heavy equipment. When a signal of 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 transmitting card 5. I 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. Further, it is also possible to connect the reception processing device 9 to a brake or a power system of the moving body 1 and automatically stop the movement of the moving body 1 using the detection signal as a trigger signal. The multiplexer 10 in the illustrated example is provided with the antenna 8 when, for example, there are a plurality of objects 3 using different weak radio waves in the work area.
Are processed by the reception processing device 9 and sequentially output 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 target object 3 can be reliably detected, and further, there is no possibility that a direction which cannot be detected due to the manner of movement of the moving body 1 may occur.

Accordingly, the object of the present invention is to provide a large construction machine
Turning a weak object from a moving object such as a machine
The provision of a "detection device for surely detecting by wave " can be achieved.

Preferably, as shown in FIG. 2, a weak radio wave is radiated while rotating the transmitting card 5 around the pivot 14 on the object 3. In this case, a weak radio wave is strongly radiated from the transmission 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 perpendicular to the radiation direction 6. When the mobile object 1 is located 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 mobile object 3 with high sensitivity. Will drop. If the directivity of the radio wave radiation, that is, the angle θ in FIG. 2B varies due to the transmitting card 5, the proximity detection also varies, which is inconvenient. However, if the transmitting card 5 emits a radio wave while rotating it about the pivot 14, the above-described disadvantage due to the variation in directivity of the radio wave radiation can be solved. According to the experiment of the present inventor, by rotating the transmitting card 5 at 30 rpm by the rotating means 15, it is possible to make the sensitivity in all directions around the same level regardless of the directivity of the individual transmitting card 5. did it. Further, when the transmission card 5 is rotated, the radio wave transmission from the transmission card 5 is intermittently performed on condition that the transmission from the transmission card 5 in all directions is ensured and the detection delay by the receiver 7 is minimized. It is also possible to reduce the burden on the power supply.

[0015]

FIG. 1C shows an embodiment of a weak radio wave radiating unit 24 according to the present invention, which can be mounted on various moving bodies 3 and is pivotally supported on an axis 14 perpendicular to the radiation direction 6 of the weak radio wave. A transmitting card 5, rotating means 15 for rotating the transmitting card 5 around a pivot 14, and mounting means 13 for detachably attaching one end of the pivot 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 external impact. In the illustrated example, the mounting means 13
The radiation unit 24 is attached to the helmet 4 and the body of the passenger car 3b of the worker who enters the work area where the heavy equipment operates (see Fig. 1 (A)). Can be removed.

FIG. 3B shows a storage means for storing a detection signal.
20 and an output means for outputting a signal stored in the storage means 20
The receiver 7 connected to 21 is shown. 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 unit 20. For example, after a day's work, information on the approaching object 3 stored in the storage means 20 can be read out by the output means 21 and used as safety management data.

A reference position 3c fixed in the work area shown in FIG.
A transmission card 5 with a narrow range of radiated radio waves is attached to the base station, and the reception signal when the mobile unit 1 approaches the reference position 3c is shown in FIG. 3 (B).
If the recording is performed using the receiver 7, the operation management of the mobile unit 1 can be performed. That is, the entrance gate (point 1)
Cards 5 with different radiated radio waves are attached in advance to control points such as a car and a maintenance shop (point n), and when the mobile unit 1 such as a dump truck passes near each control point, the radiated radio waves of the respective transmit cards 5 are received. Storage means 20
To memorize. Based on the signal stored in the storage means 20,
By detecting which reference position 3c the mobile object 1 has entered into the radio wave reach range around, the operating route of the mobile object 1 can be known. Based on the signals stored in the storage means 20, more efficient operation management and operation plans can be made.

In the present invention, the receiver 7 and the transmission card 5 are attached to the mobile unit 1 and the object 3, respectively. However, depending on the application, the transmission card 5 can be installed in the mobile unit 1 and the receiver 7 can be installed in the object 3. It is.

[0019]

As described above in detail, the apparatus for detecting an approaching object to a moving object according to the present invention is a card-type transmitter mounted on an object and emitting a weak electric wave, and a radiated electric wave provided on the moving object. Since a configuration including a receiver that outputs a detection signal in accordance with the detection of the above is used, the following remarkable effects are obtained.

(1) Even when the object enters the blind spot of the moving body, the approach of the object can be electrically detected. (2) Regardless of the moving mode of the moving body, the approach of the target can be reliably detected. (3) By reliably detecting the approaching object, it can be expected that collision or contact between the moving body and the object is prevented. (4) By rotating the card-type transmitter, it is possible to make apparent the directivity variation of the radiated radio wave in the card-type transmitter. (5) By recording the radio waves radiated from the card-type transmitter, the operation of the mobile body can be managed.

[Brief description of the drawings]

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

FIG. 2 is an explanatory diagram 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 Weak radio wave emission direction 7
Receiver 8 Antenna 9 Reception processing device 10
Multiplexer 11 Alarm 12 Battery 13
Mounting means 14 Pivot shaft 15 Rotating means 20
Recording means 21 Output means 24 Weak radio wave radiation unit.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI // G01S13 / 74 G01S13 / 93Z (56) References JP-A-2-298883 (JP, A) JP-A-62- 242029 (JP, A) JP-A-3-96799 (JP, A) JP-A-2-281400 (JP, A) JP-A-4-281598 (JP, A) JP-A-61-250800 (JP, A) Hikaru 1-114628 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01S 1/02-1/68 G01S 7/03 G01S 13/74-13/84 G01S 13 / 93 G05D 1/02 E02F 9/24

Claims (3)

(57) [Claims] A pivot provided on an object accessible to a moving body
A support shaft, a card-type transmitter which is rotated around the pivot shaft and emits a weak radio wave in a direction perpendicular to the pivot shaft, and a weak radio wave provided from the card-type transmitter provided on the moving body. An apparatus for detecting an approaching object to a moving object, comprising: a receiver that outputs a detection signal in response to detection of an object. 2. A card-type transmitter, which is pivotally supported in a direction perpendicular to pivot axis which emits weak radio waves, rotating means for rotating said card-type transmitter around the pivot shaft, and the pivot shaft A weak radio wave radiating unit comprising an attaching means for detachably attaching one end of the object to an object. 3. A pivot shaft provided at the reference position, electric waves card type transmitter that emits a narrow weak radio waves reach said pivot
Around the pivot axis so that it is radiated at right angles to the spindle
A moving body is provided with a receiver that rotates and outputs a detection signal in response to detection of a weak radio wave from the card type transmitter, and a storage unit that stores the detection signal is provided in the receiver, and is stored in the storage unit. the group of the mobile based on the detection signal
A moving object operation management method comprising managing passage of the weak radio wave reaching range around a quasi-position .