JP3301349B2 - Trailer stop position detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting a stop position of a trailer in order to accurately handle a conveyed object on a trailer using a crane.

[0002]

2. Description of the Related Art When handling, for example, a coil carried by a trailer using a crane, in order for the crane to handle the coil accurately, it is necessary to move the crane accurately over the coil. For that purpose, it is necessary to accurately detect the stop position of the trailer.

[0003] In order to detect the stop position of the trailer, Japanese Patent Application Laid-Open No. 7-10466 discloses a method in which a distance meter for measuring the distance by irradiating light or ultrasonic waves to an object to be measured is moved along the object to be measured. A method of measuring the position, height, width, and the like of an object based on continuous output data during this time has been proposed.

Japanese Patent Application Laid-Open No. Hei 3-162395 proposes a device for irradiating a measuring object with a laser beam, photographing the reflected light with a TV camera, and calculating the position of the measuring object from the video signal. ing.

[0005]

However, the method proposed in JP-A-7-10466 is also disclosed in JP-A-3-16.
The apparatus proposed in Japanese Patent No. 2395 also has a problem that the apparatus configuration is complicated. In addition, JP-A-7-1046
The method proposed in No. 6 has a problem that extra movement is required for measurement.

The present invention has been made in view of the above-mentioned conventional problems, and has as its object to provide a device capable of detecting a trailer stop position with high accuracy with a simple device configuration.

[0007]

In order to achieve the above object, a trailer stop position detecting device according to the present invention comprises a plurality of reflectors installed on a side surface of a trailer in a height direction.
It is set to be be shifted in the longitudinal direction of the trailer by ½ length. In this way, the stop position of the trailer can be detected only by the combination of ON and OFF of the sensor.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A trailer stop position detecting device according to the present invention is provided on a side surface of a trailer so as to be installed in the height direction by shifting the length of the trailer by 1/2 of the length in the front-rear direction. To detect these reflectors and these reflectors,
It is composed of a sensor arranged on the side of the trailer stop position, and a computing unit that receives the detection signal of the reflector by the sensor and obtains the trailer stop position.

In the trailer stop position detecting device according to the present invention, two or more reflectors are attached to the side surface of the trailer.
The reflector is placed in the height direction by shifting the trailer by 1/2 of the length in the front-rear direction of the trailer, and the reflector arranged in this way is detected by a reflection type photo sensor or a laser distance meter. Based on the detection signal, the calculator calculates the O
The stop position of the trailer is obtained by the combination of N and OFF.

For example, when two reflectors are used, when the trailer stops at the center of the two reflectors, both sensors are turned on. On the other hand, when the vehicle stops after moving forward or backward, only one of the sensors is turned on and the other sensor is turned off. In this case, the detection accuracy of the sensor is a displacement amount of the reflection plate, that is, 1/2 (= p) of the length L of the reflection plate, and the allowable measurement distance is (n + 1) × p, where n is the number of the reflection plates. Become.

[0011]

BRIEF DESCRIPTION based on an embodiment showing the trailer of the stop position detecting apparatus according to the present invention in FIGS.
FIGS. 1A and 1B are explanatory diagrams showing the relationship between a reflection plate installed on a trailer and a sensor, wherein FIG. 1A is a front view, FIG.
3C is a side view, FIG. 2 is a system configuration diagram of the trailer stop position detecting device according to the present invention, FIG. 3A is a layout diagram of a reflector in the trailer stop position detecting device according to the present invention, FIG. 4B is a diagram obtained by adding a sensor to the diagram of FIG. 4A viewed from the plane, FIG. 4C is a diagram showing a conversion table when the reflector is arranged as shown in FIG. FIG. 4 is an explanatory diagram in a case where skew of a trailer is detected using the trailer stop position detecting device according to the first embodiment.

In FIG. 1 to FIG. 4 , reference numeral 1 denotes a trailer, which moves forward or backward in a traveling direction [for example, a horizontal direction in FIG. 1A and FIG. Stop at 3. Then, the coil 2 on the trailer 1 is lifted by the crane 4 and transported to a predetermined position.

When the trailer 1 stops at a position deviated from the stop position 3, it becomes difficult to accurately handle the coil 2 by the crane 4.
Therefore, in the present invention, for example, three reflectors 5a to 5c are installed on the side surface of the trailer 1, and the reflectors 5a to 5c are formed by, for example, three photosensors 6a to 6c. 5c is detected, and the stop position of the trailer 1 is detected.

The detection signals detected by the three photosensors 6a to 6c are sent to an arithmetic unit 7, where the stop position of the trailer 1 is obtained. Then, the determined stop position is transmitted to the crane control panel 8 or the distribution process computer 9, where the transfer instruction coordinates are corrected,
The effect of the shift of the stop position of the trailer 1 is eliminated.

Hereinafter, a description will be given of how the reflectors 5a to 5c are installed and how the detection positions are obtained based on the detection results of the reflectors 5a to 5c by the photo sensors 6a to 6c. FIG.
(A) is a figure which shows the installation state of the reflectors 5a-5c in the stop position detection apparatus of the trailer which concerns on this invention, and the reflectors 5a-5c of the same shape are attached to the trailer 1 by 1/2 of length.
It is shifted in the front-back direction and installed in the height direction.

The photosensors 6a to 6c paired with the respective reflectors 5a to 5c are installed at the same height as the reflectors 5a to 5c. In the arithmetic unit 7, FIG.
The stop position of the trailer 1 is obtained from the conversion table shown in FIG.

For example, as shown in FIG. 3B, when the photo sensors 6a to 6c are located at the rear half position of the reflector 5a (the front half position of the reflector 5b), the photo sensor 6a , 6b detect the reflection plates 5a and 5b and turn them on, and the photosensor 6c does not detect the reflection plate 5c and turns them off.
From the conversion table of (c), the detection position is determined to be + p. In the embodiment shown in FIG. 3, the detection accuracy is determined by the reflection plates 5a, 5b,
The shift amount p of 5c, that is, 1/2 of the length of the reflectors 5a, 5b, 5c, and the allowable detection distance is 4 × p.

The trailer stop position detecting device according to the present invention not only detects the stop position as described above, but also
As shown in FIG. 4 , when the trailer 1 stops in a skewed state, the skew amount of the trailer 1 can be detected by using, for example, a laser distance meter as a sensor. In this case, for example, as shown in FIG. 4, FIG. 3
In addition to the reflectors 5a to 5c installed as shown in FIG. 5, the laser range finder 10 and the reflector 11 are shifted in the traveling direction of the trailer 1, and the laser range finder 10 and the reflectors 5a to 5c are installed.
The skew amount of the trailer 1 is obtained by the calculator 7 based on the output from the laser distance meter 12 at the position corresponding to 5c, and the skew amount is output to, for example, the crane control panel 8, and the rotation angle of the rotating hook of the crane 4 Is corrected, the coil 2 can be handled accurately.

[0019]

As described above, the trailer stop position detecting device according to the present invention has a simple device configuration in which a plurality of reflectors are shifted in the front-rear direction of the trailer by half the length. The stop position of the trailer can be detected with high accuracy by a combination of ON and OFF of the sensor.

[Brief description of the drawings]

FIGS. 1A and 1B are explanatory diagrams showing a relationship between a reflection plate installed on a trailer and a sensor, wherein FIG. 1A is a front view, FIG.
(C) is a side view.

FIG. 2 is a system configuration diagram of a trailer stop position detecting device according to the present invention.

3A is a layout view of a reflection plate in the trailer stop position detecting device according to the present invention, FIG. 3B is a view obtained by adding a sensor to FIG. It is a figure which shows the conversion table at the time of arrange | positioning a reflecting plate as shown to (a).

FIG. 4 is an explanatory diagram when a trailer skew is detected using the trailer stop position detecting device according to the present invention.

[Explanation of symbols]

 Reference Signs List 1 trailer 3 stop position 5a reflector 5aa reflector 5ab non-reflector 5b reflector 5ba reflector 5bb non-reflector 5c reflector 5ca reflector 5cb non-reflector 6a photo sensor 6b photo sensor 6c photo sensor 7 calculator

Claims (1)

(57) [Claims] 1. A plurality of reflectors of the same shape, which are installed on a side surface of a trailer in a height direction while being shifted in a longitudinal direction of the trailer by 1/2 of a length, and detecting these reflectors. , A sensor located on the side of the trailer stop position,
A trailer stop position detecting device comprising: an arithmetic unit for receiving a detection signal of the reflection plate by the sensor to determine a trailer stop position.