JPS6048887A - Communication system between crane - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a communication system, and more particularly to an improvement in a communication system between cranes used in civil engineering and construction work.

2. Description of the Related Art Conventionally, at relatively large-scale civil engineering construction sites, multiple cranes have been installed to suspend construction materials.

In this case, the working areas of each crane are partially overlapped to avoid creating blind spots.

For this reason, preventing collisions or contact between the cranes has become an important problem, and the cranes have been connected through an information communication network to prevent collisions between the cranes.

It is possible to use wireless or wired communication systems, but wireless systems generate comparatively large amounts of noise at civil engineering and construction sites, such as when driving piles. Since it has a large effect as noise, it is not suitable as a means of transmitting information, and wired methods are usually used.

However, the wired transmission means also has the following problems.

In other words, a crane suspends heavy equipment and is driven to swing, and the swinging operation is normally performed in an operator's cab provided on the swinging side. Therefore, power must be supplied from the stationary side to the swinging side via a slip ring.
Even in the communication system for transmitting information, a communication network was formed by connecting the fixed side and the swinging side of each crane via a slip ring, and connecting the fixed side to phase n through a communication line 'C.

In other words, one crane requires at least two sets of slip rings (one for power and one for communications), and slip rings used for communications in particular draw minute currents, so The contacts are made of precious metals such as gold, and are immersed in oil for dust-proofing purposes, making them expensive. Although it is sufficient to ensure the reliability of the communication system that transmits information important for safety, such as preventing collisions between cranes due to poor contact, this is not sufficient.

This invention has been made in view of the conventional problems as described above, and its purpose is to improve reliability 111-
It is located at the point where it provides a communication system between cranes that is highly connected to the crane.

In order to achieve this object, the present invention provides a crane communication system in which each crane is provided with a slip ring connected to a power line that supplies power from the fixed side to the swinging side, and a slip ring is connected to the power line on the swinging side. Each crane is equipped with a communication device via means that separates it from the power frequency, and these are connected via a power line that supplies power to each crane, and this power line is used as a communication line between the cranes. It is characterized by

Hereinafter, preferred embodiments of the present invention will be described based on the accompanying drawings.

1 and 2 show an embodiment of an inter-crane communication system according to the present invention.

Each crane is driven to rotate by a rotating shaft 10, and on the rotating shaft 10, a slip ring 16 in which a 1N ring 14 made of metal, for example, copper is attached to the periphery of a disc-shaped member 12, is attached to a predetermined vertical direction. Brushes 18 and 18 fixedly attached to the fixed side of the crane are in contact with the outer peripheral surface of the ring 14, respectively, and the rotating shaft 10 is rotated by the slip rings 16 and brushes 18. So that the electrical connection is maintained even when rotationally driven.
1 is there.

The brushes 18, 18 are connected to a commercial power source 22 connected to the end with a stationary power line 20, respectively.
A fixed-side communication device 26 is connected via a first coupling capacitor 24 that is connected in the inner row and blocks the commercial frequency.

On the other hand, each of the rings 14 of the first slip ring 16 is connected to a rotation side electric power 128 inserted through the rotation shaft 10, and the end of this second power line 28 is connected to an electric motor that rotationally drives the crane. etc. is connected to the power mechanism.

The rotating side power line 28 is connected to a communication HM 32.3 mounted on a flat swivel base 30 fixed to the rotating shaft 10.
2... are connected to each other via a second coupling capacitor 34, and this Tsushin &V 32 and the second coupling capacitor 34 are connected to the fixed side communication device 26.
It is substantially the same as the first coupling capacitor 24.

The fixed side communication device 26. Details of the communication device 32 mounted on each crane are shown in FIG.

Tsushin@26.32 is a transmitter section 50J connected in parallel.
'i and the receiver section 60.

The transmission unit 50 includes a high frequency oscillator 52. A modulator 54, an amplifier 56, and a filter 58 are connected in series, and the output signal of the high frequency oscillator 52 is modulated by an analog or digital modulator 59, and the amplifier 56 increases the signal to a predetermined level. After that, filter 5
B removes unnecessary signal components and performs the first or second combination: I indenzer 2/1. ．． 34 to the stationary or rotating power line 20.28.

On the other hand, the receiver section 60 includes a filter 62 . amplifier 64
．． The demodulator 66 is connected in series with the J3, and by interposing the first or second coupling capacitor 27I, 34, a high frequency (only No. 6 is taken in, unnecessary signal components are removed by a filter 62, and the target signal is output after being amplified and demodulated.

In the above-mentioned crane-to-crane communication system having the IJ and S configurations, the commercial frequency power that drives each crane to swing is:
From the commercial power source 22 to the fixed power line 22. The power is transmitted to the slip ring 16 via each brush 18, and further transmitted to the rotating power mechanism through the rotating power line 28.

1/j, the information emitted from the fixed side communication device 626, for example to prevent a collision between cranes, is superimposed on the commercial frequency alternating current flowing through the power line 20.22, which is the same as the above electric power. The information is transmitted to the rotating side of each crane, received by the receiver section 60, and the crane operator takes eleven measures to prevent a crane collision based on this information.

Now, in the communication system having the above-mentioned configuration, since the same power lines 20, 2B and the threading ring 16 are used for transmission and reception of power and communication, it is expensive and expensive compared to conventional systems of this type. This eliminates the need for an unstable slip ring exclusively for communication, making it economical and improving the reliability of the communication system.

Moreover, between the slip ring 16 and the brush 18,
Since a large current is flowing to drive the crane in rotation, contact failures are extremely rare, which also improves the reliability of the system.

In the above embodiment, the communication device 26 is also installed on the fixed side, but it goes without saying that the device 26 is not necessary when information is exchanged only between the rotating sides.

Furthermore, this system allows the user to select the modulation signal type (digital, analog) and modulation method (FM, FSK, etc.) as appropriate. It can be used for a wide range of applications such as data communication.

As described above in detail in the embodiments, in the crane-to-crane communication system according to the present invention, the power line that supplies power to each crane is used as a four-phase crane communication line. Various effects such as reliability and economic efficiency can be achieved.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the entire system according to an embodiment of the present invention, and FIG.
8 is a block diagram of the device. 10...Rotating shaft 12...Disc-shaped member 14...Ring 16...Slip ring 18...Brush 20...・Fixed power line 22...Commercial power line 1 24...First coupling capacitor 26...
- Fixed side communication device 28...Rotating side power line 30...Swivel base 32...Communication device 34...Second coupling capacitor 50...・
・Transmitter section 52...High frequency oscillator 54...
... Modulator 56 ... Amplifier 58 ...
・Filter 59...Modulation input 60...
・Receiver section

Claims (1)

[Claims] 1) In a communication system in which a plurality of swing-driven cranes are installed and mutually transmits information such as collision prevention between the cranes, power is supplied to each of the cranes from the fixed side to the swing side. A slip ring to which a power line is connected is provided, and a communication device is mounted on each of the power lines on the swing side via a means that separates from the power frequency, so that the power lines supplying power to each of the cranes are An inter-crane communication system characterized in that the cranes are connected through a power line and the power line is used as a communication line between the cranes.