JPH01276836A - Space signal communication equipment - Google Patents

Abstract

PURPOSE:To surely attain the signal communication even at a place having a large rotation swinging by executing the space transmission through a converging diffusing lens with near infrared rays. CONSTITUTION:A signal generated from a work station 5 is E/O-converted by a converter 18 and communicated to a unit U (in casing 20) by a light transmitting line 17. An O/E converter is built in the casing 20, a light signal is converted to an electric signal, and the electric signal is inputted to a light emitting diode which is a light emitting element 21 and the light signal of the near infrared rays is generated to a unit U facing through a diffusing lens 24. A photo diode as a light emitting element 22 built in the casing 20 of the unit U receives the light signal generated from the light emitting element 21 through a converging lens. Since the output of the photodiode is the electric signal, it is converted to the light signal by an E/O converter built in the casing 20 and the signal is communicated to an adjoining tower crane by a light transmitting line 16. Thus, even when a light axis is dislocated a little, the signal transmission is not troubled.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for transmitting signals between a stationary side and a rotating side.

[Conventional technology and its problems]

Signal transmission includes electrical communication and optical communication, and in the former, signal transmission between the stationary side and the rotating side is generally carried out by a slip ring and its sliding brush. However, this transmission means using sliding contact has a problem in that the signal cannot be reliably transmitted due to the adhesion of oil or the like to the transmission sliding contact surface, fluctuations in the sliding contact force, etc. Furthermore, especially in the case of a tower crane, a slip ring for supplying power for operating the tower crane is attached to its signal transmission section, so there is a risk of electromagnetic induction interference.

On the other hand, the latter method involves transmitting and receiving light through a gap between the fixed side and the rotating side, and there is no problem with the above-mentioned sliding contact means.As this transmission means, various types called optical rotary connectors have conventionally been used. The methods can be roughly divided into the following two methods.

■ The end faces of the signal transmission optical fibers on the stationary side and the rotating side are opposed on the same optical axis. ■ The signal transmission optical fiber is provided on one of the stationary side and the rotating side, and a light receiving element or a light emitting element is provided on the other side, facing each other. However, since the end face of the optical fiber is minute, the method (2) cannot perform reliable signal transmission unless the optical axes are always aligned.For this reason, it cannot be used in areas where rotational vibration is large.9For example, It cannot be used between the pivot of the foundation installed at the top of the tower in a tower crane and the round table on which the boom and workstation are mounted.

Furthermore, in the method (2) above, since the light receiving element receives the light (disicle) signal emitted from the optical fiber and outputs it as an electric signal, there is a possibility that electromagnetic induction interference may occur here.

This invention takes the above points into consideration, and has no electromagnetic induction interference.
Another object of the present invention is to provide a device that can reliably transmit signals even at locations where the rotation I3 is large.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a device for transmitting signals between a stationary side and a rotating side. /,
Converter - light-emitting element - light-receiving lens and condensing lens - light-receiving element - E/. A configuration in which one of two electromagnetic shielding casings containing a converter is placed on the stationary side and the other on the rotating side, with concentrating and losing lenses facing each other, and an optical transmission line is connected to the double power converter. That's what I did.

This spatial signal transmission device is more effective when installed at a location where rotational shaking is large, such as between the pivot of the base provided at the top of the tower crane and the round table on which the boom and workstation are mounted.

[Effect]

In the spatial signal transmission device configured in this manner, a signal from a signal line is emitted as an optical signal from a light emitting element, and this optical signal is received by a light receiving element to perform signal transmission. At this time, since the light-emitting element and the light-receiving element can obtain a larger directivity angle than the one end surface of the optical fiber, signal transmission is ensured even if the rotational fluctuation is large. Furthermore, since the light emitting and light receiving elements are built into the casing and are shielded from electromagnetic induction, there is no influence from disturbances such as electromagnetic induction interference.

〔Example〕

This embodiment is applied to the tower crane shown in FIG. That is, a base 2 with a ring-shaped hook 1 attached to the top of the tower part T is provided, a round table 3 is rotatably and non-removably mounted on this base, and the round table 3 is mounted on the base 2 at the center of the round table 3. Pivot 4 passes through it. Round table 3 has workstation 5
, beam B1 counterweight, motor or guy support, etc. are provided.

The penetration part of the pivot 4 is provided with means Q for supplying power to the motor, and a space transmission unit U for transmitting and receiving signals emitted from the workstation 5 and signals sent from an adjacent tower crane. As shown in FIG. 1, the power supply means Q and the space transmission unit U are constructed in a metal casing 10 fixed to the round table 3 along the same axis as the rotation axis a of the round table 3.

As shown in FIG. 1, in the above power supply means Q, a slip ring 11 to which a power supply line 13 is connected is attached to a support rod 12 integrated with the pivot 4, and the casing 10 is in contact with the slip ring 11. A current collecting brush 14 is supported by the cough current collecting brush 14 , and a power supply line 15 extends from the cough current collecting brush 14 to supply power to the motor on the land cable 3 .

As shown in FIG. 3, the space transmission unit l-U has a light emitting diode as a light emitting element 21 and a photodiode as a light receiving element 22 housed in a metal casing 20, and the light emitting part includes a diffuser lens and a light receiving element. There is a condenser lens 2 in the
The optical signal is transmitted and received between the light emitting element 21 and the light receiving element 22 which face each other (upper and lower in FIG. 1). That is, the light from the light emitting element 21 is emitted within a predetermined angle range by the light scattering lens 24, and the light is collected by the condensing lens 23 and introduced into the light receiving element 22. Therefore, even if the optical axes of the opposing light-emitting/light-receiving elements 21 and 22 are shifted to some extent, optical signals can be reliably transmitted and received. In other words, the directivity angle is wide, and the lens 23.2
Even without the lenses 23 and 24, the directivity angle between the light emitting and light receiving elements 2L and 22 is much wider than between the end faces of the optical fibers, and the lenses 23 and 24 are not necessarily required.

In this embodiment, one of the space transmission units U is attached to the inner surface of the top of the casing 10, and the other is attached so as to face the top of the support rod 12 to which the slip ring 11 is attached. In this installation state, the light emitting/light receiving element 21
．． The center between the two casings 22 is located on the rotation axis a, and in this state, even if one casing 20 rotates with some wobbling, optical signals can be transmitted and received reliably. In addition, two transmission/reception circuits are formed, one of which is connected from the tower part T to the boom B.
The other side is used for signal transmission in the opposite direction, and the carrier frequencies of the two are different to eliminate interference.

Next, the signal transmission path of the spatial transmission unit U will be explained based on FIG. 2.

The signal originating from workstation 5 is converted to E by converter 18.
/. It is converted and transmitted to the unit U (inside the casing 20) via the optical transmission line 17.

The casing 20 has a built-in 0/E converter, which converts the optical signal into an electrical signal. This electrical signal is input to the light emitting diode, which is the light emitting element 21, and the near-infrared light signal is sent to the diffuser lens 24. and is sent to the opposing unit U.

A photodiode as a light receiving element 22 built into the casing 20 of the unit U receives the optical signal emitted from the light emitting element 21 through a condensing lens. Since the output of this photodiode is an electric signal, it is converted into an optical signal by an E/O converter built in the casing 20 and then transmitted to the optical transmission line 1.
6 transmits the signal to the adjacent tower crane.

In FIG. 2, the converter 18' is required when connecting adjacent tower cranes using electrical signals, but is not required when connecting adjacent tower cranes using optical signals.

Working station 5 from the adjacent tower crane
The transmission of the signal to the working station run is the reverse of the operation described above when starting from the working station run.

In FIG. 2, reference numeral 13.15 indicates a converter built into the casing 20 and a power lead wire to the converter, but this becomes unnecessary when a battery is housed within the casing 20. Further, C is a connector.

〔Effect of the invention〕

As can be understood from the above description, the present invention provides the following effects.

+1+ Since near-infrared rays are spatially transmitted via condensing/diffusion lenses, they are not affected by arcs emitted from power supply slip rings, and even if the optical axis is slightly shifted, there is no problem with signal transmission.

(2) Since the spatial transmission units such as the transmitting and receiving elements are shielded by the casing, they are not affected by external disturbances.

(3) The part running parallel to the power supply line is an optical transmission line, so there is no risk of electromagnetic induction interference.

(4) The transmission direction angle is wide and the signal is reliably transmitted even in locations where rotational vibration is large.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part of an embodiment of a spatial signal transmission device according to the present invention, FIG. 2 is a wiring diagram of a main part of the same embodiment, FIG. 3 is a perspective view of a space transmission unit, and FIG. It is a schematic diagram of a tower crane. B...Boom, T...Part of the tower, U...Space transmission unit, 2...Base, 3...Round table, 4...Pivot, 5...Workstation, 10...Casing, 11...Slip ring, 13.15...Electric I-wire , 14・
..... Current collection brush, 16.17 ..... Signal line, 21 ..... Light emitting element, 22 ..... Light receiving element.

Claims (2)

[Claims] (1) In a device that transmits signals between a stationary side and a rotating side, two electromagnetic devices each containing an O/E converter, a light emitting element, a diffuser lens and a condensing lens, a light receiving element, and an E/O exchanger are used. one side of the shielding casing is on the fixed side, the other side is on the rotating side,
1. A spatial signal transmission device, characterized in that a converging lens and a diverging lens are arranged to face each other, and an optical transmission line is connected to both of the converters. (2) A tower crane, characterized in that the spatial signal transmission device according to claim (1) is configured between a pivot of a base provided at the top of the tower and a round table on which a boom and a workstation are mounted. Spatial signal transmission device for tower cranes.