JPS58175330A - Transmitting mechanism of electric signal - Google Patents

Abstract

PURPOSE:To assure the transmission of electric signals with a miniature mechanism, by transmitting the electric signal that is transmitted between a fixed base and a rotary base by means of an optical signal converted from said electric signal between a light emitting part and a photodetecting part. CONSTITUTION:For a light emitter 28, the electric signal delivered from a control part 30 of changeover switches is converted into an optical signal through an electricity-light converting part 31. At the part 31, the electric signal delivered in parallel from the part 30 is converted in a series form by a parallel- series converter 33 and then converted into an optical signal by an electricity- light converter 34 comprising an LED and an optical system to be led to each fiber 32. The optical signal led to the emitter 28 is made incident to its corresponding photodetector 29 and then sent to a light-electricity converting part 36 via an optical fiber 35.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electric signal transmission mechanism for transmitting and receiving electric signals between a fixed hook and a rotating side.

For example, a truck crane is equipped with a swivel base on the vehicle body, and the swivel base is equipped with a crane device consisting of a telescoping boom, etc., and a work operator's cab for operating the crane device. By rotating, the extension direction of the telescopic boom can be freely changed in relation to the direction of the vehicle body, and crane work can be performed.
This allows these tigers and kukranes to have a wide range of work.

By the way, in the above-mentioned truck crane, since the above-mentioned work operation station is also installed on the swivel platform, electrical signals are transmitted from the hydraulic system on the single unit side to various handling instruments such as the oil pressure gauge in the work operation cab. When transmitting and receiving electrical signals to the vehicle body, or conversely when controlling the operation of various actuators by transmitting electrical signals from switches in the operating cab to the electromagnetic pulp, etc. in the hydraulic system on the single unit side, the transmission and reception of each of the above electrical signals is performed by the vehicle body. and the swivel base. Therefore, conventionally, a rotary joint, so-called rotary brush, as an electric signal transmission mechanism is provided between the E vehicle body and the above-mentioned swivel base, and each electric signal is exchanged between the two via this rotary brush. It has become so.

However, the above-mentioned rotary plan generally has a ring-shaped fixed contact point on the upper surface or circumferential surface of the fixed pace fixed to the vehicle body, and a rotating base facing the '1lii or curved surface of this fixed pace is fixed on the above-mentioned swivel base. The rotary base is configured to rotate together with the swivel base, and a movable contact is provided on the lower surface or inner circumferential surface of the rotary base and is always in sliding contact with the fixed contact regardless of the rotation of the swivel base. For this reason, in the rotary brush with the above configuration, the rotating contacts make sliding contact with the stationary contacts, which not only tends to cause poor contact between these contacts, but also tends to introduce noise into the signal transmission path. There were problems such as,
When trying to transmit a large number of electrical signals with the rotary brush mentioned above, the fixed contacts and movable contacts are required depending on the number of electrical signals, which is likely to cause poor contact between these contacts, and the rotary brush is large. There was a problem that caused the shape to become complicated and the mechanical structure to become complicated.

This invention was made based on these circumstances, and its purpose is to provide an electrical signal transmission mechanism that is compact and capable of transmitting signals to the dormitory. This invention is provided with a light emitting part and a light projecting part t7 on the fixed base and the rotating base, which face each other and are capable of transmitting and receiving the original during reflection, regardless of the rotation of the rotating base, and between the fixed base and the rotating base. The electric signal transmitted by the electric signal is transmitted between the light emitting section and the light receiving section as an optical signal obtained by converting this electric signal.

A first embodiment of the present invention will be described below based on FIGS. 1 to 3.

Figure 1 shows a schematic diagram of a truck crane, in which 1 is the vehicle body, 2 is the wheels, 3 is the driving cab, 4 is the turntable, 5 is the extendable boom, 6 is the working cab, 7 is a crane and an outrigger that supports the vehicle body 1 during work.

In the work operator's cabin 6, in order to carry out crane work, a large number of switches are arranged to switch and control the operation of the hydraulic system consisting of four types of hydraulic gauges such as oil pressure gauges and each rod actuator. Electric signals from the hydraulic system on the car body 1 side and a detector that detects the entire attitude of the car body 1 are transmitted to each of the above-mentioned instruments, and the upper B self-switching switches transmit the electric signals to the car body 1 side. By the way, electric signals are transmitted to the respective hydraulic systems of the vehicle body 1 and the various instruments and instruments in the operating cab 6 placed on the rotating platform 4. When transmitting each of the above-mentioned warm-up signals to the changeover switches, the transmission of these electrical signals is done by the electrical signal transmission mechanism shown by 10 in Figure 1, and this electrical signal transmission mechanism will be described below. The configuration of 10 will be explained based on FIG.

In the figure, 21 is the chassis frame of the vehicle body 1, and 22 is the swivel base 4.
This revolving frame 22 is connected to the chassis frame JJ through a revolving bearing (not shown) and is rotated by a revolving motor (not shown) consisting of a hydraulic motor. In other words, it is rotatable. ◎The chassis frame 21 has a cylindrical fixed penis 2 that is coaxial with the rotation center of the rotation frame 22.
3 is fixed. Fixed upper surface 2 of this identification base 23
4 is spaced apart from and opposite to a rotationally opposed rotating base fjJ2g formed under the floor 25 of the swivel table 4, for example.
Therefore, this rotating opposing surface 26 is configured to rotate relative to the fixed upper surface 24 as the swivel base 4 rotates.

A light transmitting/receiving section 27 is provided on the fixed upper surface 24 and the rotating opposing surface 26. This light transmitting/receiving section 27 includes, for example, a light emitting device 28 on the rotating opposing surface 26, and also on the fixed upper surface 24. The light receiver 29 is always directly opposed to the light receiver 29.

That is, Fi#13 on the light receiver 29... side
As shown in the figure, these light receivers 29 are provided concentrically on the fixed upper surface 24 with the above-mentioned turning center as an axis.The -h name emitter 28 is provided with a control section for the above-mentioned changeover switches. The electrical signal output from 30 is converted into an optical signal by the electrical/optical converter 3, and then connected to the optical fiber 32.
It is designed to be guided through... That is, the electricity/source exchange unit 11 converts electrical signals outputted in parallel from the control unit 30 into series by the parallel/serial converter 33, and then converts the electrical signals into an electricity/light converter consisting of a light emitting diode and an optical system. The converter 34 is configured to convert the electrical signal into an optical signal and guide it to the valley fiber 32. The original signals guided to each light emitter 28 in this way are input to the corresponding base receiver 29, and then transmitted to the optical-to-electrical converter 3 by the same optical fiber 35.
6. This light/electricity converter 3
Reference numeral 6 is configured to convert the above-mentioned optical signal into an electrical signal again by an optical-to-electrical converter 37 consisting of an optical system, a photodiode, etc., and convert this serial electrical signal into a parallel electrical signal by a direct conversion l1Fss. ing.

Thereafter, the electric signal is guided to the hydraulic system on the vehicle body 1 side via the relay circuit 39, for example, to the electromagnetic pulp 40 in the hydraulic cylinder of the IJ gaff, and the outrigger is activated based on the electric signal from the control section 30. 7 operations are controlled. In addition, in the light transmitting/receiving section 27, there is a section L for reliably transmitting the optical signal from each light emitter 28 to its light receiver 29 without interfering with others.
Although the dII ear 41 is provided, it goes without saying that the light receiver 29 is provided with an optical system consisting of a lens, etc., so that the optical signal from the light emitter 28@ is reliably incident thereon. .

9. In the above explanation, we have talked about the signal transmission path that transmits the electric signal from the control s30 on the swivel base 4 side to the car body J@, but conversely, the electric signal from the hydraulic system of the 1st car body is transmitted to the swivel base 4 side. When transmitting the signal to various instruments, it is possible to obtain the signal by reversing the configuration of the signal transmission path.

The fixed pace 23 is provided with a rotor 42 that is fixed to the rotating frame 22 and has the fixed pace 23 as its axis. A hydraulic transmitter is comprised of a so-called rotorino, and 43... is an oil outlet pipe.

Therefore, according to the electric No. 18 transmission mechanism having the above configuration, when transmitting and receiving an electric signal between the fixed upper surface 24 and the rotating opposing surface 26, this electric signal is converted into the original signal and the signal transmission path is Since the fixed upper thj4 and the rotating interlock thI26 are not provided with a fitting part that makes electrical conduction flexible, such as the conventional flexible wJ point, the C+ (! signal transmission As a result,
This is not a foolproof method that can reliably prevent problems such as poor contact between conventional fixed contacts and movable contacts, but a method that can reliably prevent noise from entering the signal transmission path without the need for contact. It is.

Furthermore, by converting an electrical signal into an optical signal and transmitting it, a large amount of information can be transmitted through a single signal transmission path such as the optical fiber, so when trying to transmit the same information t, the light emitting The number of signal transmission paths consisting of the receiver 28 and the light receiver 29 can be reduced, and the entire mechanism can be made smaller.

Note that the present invention is not limited to the first embodiment, but as a modification of the first embodiment, the light receivers 29 may be provided on the outer peripheral surface of the fixed space 23 as shown in FIG. Furthermore, the present invention is not limited to a device for transmitting electrical signals between the vehicle body 1 and the swivel base 4 of a truck crane, but can also be applied to a cord reel 50 as shown in FIG. That is, the cord reel 50 guides an electrical signal from a boom hoisting angle needle attached to the tip of a telescoping boom 5 of a truck, crane, etc. to the work operator's cab 6, and displays the electric signal on a display in the work operator's cab. It constitutes an electrical signal transmission path that enables the display of nine values based on the signal, and in the case of such a code reel 50, a light emitting fX 5154 is provided on the rotation end surface 53 of the rotation shaft 520 of the reel 51 as a rotation pace, and This rotating end surface 53
A base 564t1 as a fixed pace facing the base 564t1. < is I
By providing the light receiver 60 in the fixed directions 58 and 59 of the bar 57, it is possible to apply fresh water. Further, in the case of the second embodiment, the light emitter 54 is constituted by a light emitting element such as a light emitting diode or a semiconductor radar which mixes the @ contact signal into an optical signal, and the light receiver 6o is constituted by a photodiode or the like. This configuration is also applicable to the first embodiment.Also, as in the first embodiment, electricity from a detector such as the boom undulation angle needle is The signal may be converted into an optical signal on the spot, and this optical signal may be guided through the original fiber to transmit the signal between the rotating end surface 53 and the fixed end surfaces 58 and 59.

In this way, electrical noise from the outside will not enter the signal path during transmission from the detector through the optical fiber, thereby increasing the reliability of signal transmission.

Furthermore, it goes without saying that the present invention is applicable not only to the field of truck and crane machines, but also to signal transmission paths in various fields in which electrical signals are transmitted between a fixed base and a rotating pace.

As explained above, the present invention provides a fixed base and a rotating pace with a light-emitting part and a light-receiving part that directly face each other and are capable of transmitting and receiving light between the two, regardless of the rotation of the rotating pace. IP refers to the transmission and reception of signals between electrical signals and optical signals converted from electrical signals.
#11. Therefore, it is possible to transmit signals by converting electrical signals into optical signals in this way.
), the signal can be transmitted between the fixed pace side and the rotating pace side without providing a sliding part for electrical conduction, thereby preventing problems such as poor contact and noise, and ensuring reliable operation. Since it is possible to transmit signals and a large amount of information can be transmitted in one signal path, it has great practical effects, such as the ability to downsize the entire mechanism.

[Brief explanation of the drawing]

1 to 3 show a first embodiment of the present invention, a
Figure g1 is a schematic diagram of the truck crane, Figure 2 is a configuration diagram showing the signal transmission mechanism, Figures 3 and 4 are configuration diagrams of the light transmitting/receiving section showing a modification of the first embodiment, and Figure 5 is a configuration diagram showing the signal transmission mechanism. 23... Fixed base, 26... Rotating opposing surface (rotating base 'X,), 21... Light transmitting/receiving section, 28... Emitting 'ni vessel (@motobu), 2゛9...S: light vessel (light receiving part), sl,
35... Optical fiber, 53... Rotating end surface, 511.5
9.Fixed field L

Claims (2)

[Claims] (1) Electrical signals are exchanged between a fixed pace and a 9-rotation pace that is opposed to the fixed pace. A light emitting section and a light receiving section capable of transmitting and receiving light between the fixed pace and the rotating pace are provided, and a signal transmitted between the fixed pace and the rotating pace is transmitted between the light emitting section and the light receiving section. An electrical signal transmission mechanism characterized in that transmission is performed using an original signal obtained by converting the above electrical signal in a cabinet. (2) The above-mentioned light emitting section and light receiving section are constructed with their open ends facing each other. The electric m-number transmission mechanism according to claim 1.