JP2978559B2 - Signal transmission equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for transmitting an electric signal from a rotating body to a stationary part in a non-contact manner, and particularly to a small and highly reliable signal transmission device. is there.

[Prior Art] Conventionally, a signal transmission device for exchanging signals between a rotating body and a stationary part has been widely used.

For example, in a papermaking roll device for the purpose of polishing, a command signal or the like is transmitted from a device body (stationary part) to a roll (rotating body), and the temperature of the roll heated by induction heating is used as a data signal. Need to be transmitted.

As described above, a device that transmits a digital signal or a digitized data signal and an analog signal between the rotating body and the stationary unit is not limited to the roll device, and various types of NC machine tools, robot devices, transfer devices, and the like. Applied to rotating machinery.

Further, as this type of device, a rotating side module is provided on a rotating body, a fixed side module is provided on a device body (stationary portion), and an FM telemeter, a wireless modem for transmitting an electromagnetic wave (or light) as a medium, and the like. It has been known.

Such a signal transmission device is advantageous in that the transmission distance can be increased, but it is not appropriate to use it by attaching it to a rotating machine for structural reasons. Further, the apparatus is easily affected by ambient electric field noise and the like, and the electric field intensity of the electromagnetic wave radiated from the apparatus main body may adversely affect peripheral devices. In addition, FM telemeters and the like have a complicated circuit configuration and are expensive, and optical ones are easily affected by adhesion of oil and dust.

Further, even in a device in which the rotating body and the stationary part are configured coaxially, it is difficult to make the distance between the rotating-side module and the fixed-side module constant, and it is difficult to perform stable transmission. .

Furthermore, when a dry battery is used as a power source for transmitting various signals, it is necessary to make it easy to replace the dry battery, and there are many design restrictions.

[Problems to be Solved by the Invention] As described above, even if the conventional signal transmission device is a non-contact type, it does not consider cost reduction and miniaturization, etc.
Since the transmission path is easily affected by noise, there is a problem in that it is not economical and has low reliability.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and the distance between a transmission head and a reception head is regulated by providing a module including a transmission head and a reception head on a coaxial rotating body and a stationary part, respectively. In addition, an object of the present invention is to realize a highly efficient and stable signal transmission, to simplify handling and installation conditions, and to obtain a small and highly reliable signal transmission device.

[Means for Solving the Problems] A signal transmission device according to the present invention includes a rotating module provided integrally with a rotating body on which a sensor is mounted, and a rotating module included in the rotating module and extending along a rotating direction of the rotating body. The transmission head and the reception head provided in a ring shape, the fixed module provided integrally with the stationary portion formed coaxially with the rotating body, and the transmission head and the reception head included in the fixed module are individually provided. It comprises a ring-shaped receiving head and a transmitting head arranged opposite to each other, and a bearing interposed between the rotating body and the stationary part.

[Operation] In the present invention, the rotating body and the stationary part are coaxially installed via a bearing, and are mechanically coupled to be integrated into one body, thereby transmitting bidirectional electromagnetic wave signals between the rotating-side module and the fixed-side module. , Through the respective transmitting and receiving heads.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side sectional view showing a schematic configuration of a main part of an embodiment of the present invention, and FIG. 2 is a block diagram showing a circuit configuration of each module in FIG.

In FIG. 1, (1) is a rotating shaft shown on the apparatus main body, and (2) is a rotating body mounted with sensor means such as a temperature sensor (described later) and integrally provided with the rotating shaft (1). ,
(3) is a stationary part formed coaxially with the rotating body (2) and fixed to the apparatus body, (4) is a metal fixed to the rotating body (2), and (5) is a stationary part (3). Fixed metal,
(6) is a bearing interposed between the rotating body (2) and the stationary part (3).

(7) is a fixture for fixing the stationary part (3) to the apparatus main body, and includes a bearing (8) interposed in a contact part between the rotating shaft (1) and the rotating body (2), and a rotating body ( 2) a bumper (not shown) for absorbing the stress during rotation.

Reference numeral (10) denotes a rotation-side module provided integrally with the rotating body (2) and the metal (4), and has a ring shape along the rotation axis direction of the rotating body (2). (16) is a signal transmitting head for transmitting a data signal from the sensor means by electromagnetic waves, and (17) is a power receiving head for receiving a power signal composed of electromagnetic waves, and these are rotary-side modules (10).
And provided in a ring shape along the rotation direction of the rotating body (2).

Reference numeral (20) denotes a fixed-side module provided integrally with the stationary part (3) and the metal (5).
It has a ring shape so as to face 0). (twenty three)
Is a power transmission head that transmits power by electromagnetic waves, (24)
Are signal receiving heads for receiving data signals composed of electromagnetic waves, which are included in the fixed-side module (20), and are individually arranged opposite to the power receiving head (17) and the signal transmitting head (16). It has a shape.

The rotating side module (10) is housed in the rotating body (2),
The fixed module (20) is housed in the stationary part (3). Further, the rotation-side module (10) is fixed to the rotation shaft (1) to be installed by a mechanism such as a key groove and a bush (not shown).

Thereby, the transmission / reception mechanism of the rotating side module (10) and the transmission / reception mechanism of the fixed side module (20) are coaxially and integrally formed with the rotating body (2) and the stationary part (3) via the bearing (6). Are combined. Here, the power required for the operation of the rotation-side module (10) is configured to be transmitted from the fixed-side module (20) in a non-contact manner, and the transmission power is used to transmit the power from the rotation-side module (10). The case where a data signal is transmitted to the fixed-side module (20) is shown.

On the other hand, in FIG. 2 showing an example of the circuit configuration of the rotating side module (10) and the fixed side module (20), (9)
Is a temperature sensor serving as a sensor means, which comprises a resistance temperature sensor and a thermistor, and is connected to the rotation-side module (10).

The rotating module (10) consists of the following elements (11) to (19)
It is composed of

(11) is a processing circuit to which a detection signal from the temperature sensor (9) is input, and is configured by a bridge, a cold junction compensation circuit, and the like. (12) is a preamplifier for amplifying the detection signal passed through the processing circuit (11) to an appropriate voltage, and (13) is an oscillation circuit for generating a frequency f1 of the data signal. (14) is an FM circuit to which a detection signal via the preamplifier (12) is input, and is excited by the frequency f1 from the oscillation circuit (13). (15) is a power amplifier that amplifies the FM wave generated from the FM circuit (14), and converts the data signal (electromagnetic wave) of the frequency f1 from the signal transmission head (16) to the signal reception head of the fixed module (20). (24).

The power receiving head (17) receives the power electromagnetic wave of the frequency f2 from the power transmitting head (23) of the fixed-side module (20). (18) is a rectifying / smoothing circuit for converting the power signal received by the power receiving head (17) into DC, and (19) is a constant voltage circuit for stabilizing the voltage converted to DC by the rectifying / smoothing circuit (18).

The fixed side module (20) includes the following elements (21) to
(28).

(21) is an oscillation circuit that generates the frequency f2 of the power electromagnetic wave. (22) is a power amplifier for amplifying the oscillation signal generated from the oscillation circuit (21), and transmits the power electromagnetic wave of frequency f2 from the power transmission head (23) to the rotating module (10).
To the power receiving head (17).

The data signal of the frequency f1 is received by the signal receiving head (24) from the signal transmitting head (16) of the rotating module (10). (25) an RF amplifier that amplifies the data signal received by the signal receiving head (24), (26) an FM demodulation circuit that restores the RF-amplified data signal to the original detection signal,
(27) is an output circuit that scales the demodulated detection signal so as to be suitable for an external output, and (28) is a power supply circuit that receives an external power supply such as a commercial power supply.

The transmission / reception heads (16), (17),
Various configurations are conceivable as specific configurations of (23) and (24). Generally, a parallel circuit including a capacitor and a coil can be used. In this case, a bobbin is provided on each of the rotating-side module (10) and the fixed-side module (20). Of the pair of bobbins, the rotating-side module (10) has a signal transmitting head (16) and a power receiving head (17). ), And the power transmitting head (23) and the signal receiving head (24) may be wound around the fixed-side module (20). As a result, a ring-shaped transmitting / receiving head which is opposed to the transmitting / receiving head as shown in FIG. 1 is formed.

Next, the operation of one embodiment of the present invention will be described with reference to FIG. 1 and FIG.

Since the fixed-side module (20) is provided in the stationary part (3), the power supply circuit (28) can be easily installed, and power is arbitrarily supplied by a battery or a power generating element or by a commercial power supply such as a power line. be able to.

On the other hand, the power required by the rotating side module (10) and the various loads accompanying it is fixed
Is transmitted by electromagnetic induction.

That is, the oscillation signal of the frequency f2 generated by the oscillation circuit (21) is amplified by the power amplifier (22), and is radiated as a power electromagnetic wave of the frequency f2 by the power transmission head (23). This power electromagnetic wave is received by the power receiving head (17), is converted into a direct current by a rectifying / smoothing circuit (18), is stabilized by a constant voltage circuit (29), and is used in the rotating module (10). .

The power thus received may be charged to a large-capacity capacitor or a secondary battery (not shown) as necessary.
As a result, it is possible to function as a stable power supply at all times or even when the system is stopped. In other words, even if the speed of movement of the rotating body (2) changes when the machine is at rest, the large-capacity capacitor or the like is operated to stably supply power to each element in the rotating-side module (10). can do.

If necessary, a photovoltaic element such as a solar cell that receives external irradiation light and generates electric power may be installed in the rotation-side module (10), and an auxiliary power supply such as a primary or secondary battery may be added. Good.

Further, when a common clock is required for the rotation-side module (10) and the fixed-side module (20) (for example, when a baud rate clock for transmitting data signals serially is shared), the frequency of the power electromagnetic wave is increased. The frequency f2 may be modulated by the clock frequency or the frequency f2 of the power electromagnetic wave may be set to an integral multiple of the clock frequency to be transmitted. Thus, the scale can be adjusted between the rotation-side module (10) and the fixed-side module (20), and a common clock can be obtained.

The rotating-side module (10) to which power is supplied transmits data (detection signal) from the temperature sensor (9) installed on the rotating body (2) to the fixed-side module (20) as follows.

That is, the detection signal output from the temperature sensor (9) is
After being compensated by the processing circuit (11), the preamplifier (12)
FM circuit (1
The signal is converted into an FM wave by 4), further amplified by a power amplifier (15), and then emitted as an electromagnetic wave from the signal transmission head (16).

The data signal of frequency f1 transmitted from the rotation-side module (10) is received by the signal receiving head (24) in the fixed-side module (20) and amplified by the RF amplifier (25). The signal is demodulated into the original detection signal by (26) and output from the output circuit (27) to the outside. At this time, the external output is appropriately scaled by the output circuit (27) and set to, for example, 4 mA to 20 mA or 1 V to 5 V. The power required for the fixed-side module (20) is supplied by a power supply circuit (28).

As described above, the rotating body (2) and the stationary part (3) are coaxially installed via the bearing (6), and are mechanically connected to each other to form an integral structure. The bidirectional signal transmission of (20) is performed via the transmission / reception heads (16), (17), (23) and (24). Therefore, the circuit configuration is relatively easy to handle and relatively simple, and high-precision data transmission can be stably performed.

Also, as described above, since the power required for the rotating module (10) is transmitted from the fixed module (20) in a non-contact manner, it is necessary to mount a power source such as a dry battery on the rotating module (10). Instead, the rotating-side module (10) can be configured to operate without power. Therefore, even when the rotating-side module (10) is incorporated in the rotating body (2) of a production machine or the like, consideration for battery replacement or the like becomes unnecessary, and the design burden is reduced.

In addition, since the relative position of the rotation-side module (10) is accurately determined with respect to the fixed-side module (20) via the bearings (6) and (8), the distance between the modules is small and constant. Can be set to Therefore, the size can be reduced, and the power to be handled can be reduced, so that the signal or power transmission efficiency can be improved. Further, since the electric power is reduced, the leakage magnetic field is reduced, and the adverse effect on the outside can be suppressed. Further, since the intensity of the electric field to be coupled is increased, the electric field is hardly affected by external noise, and the reliability is improved. Furthermore, since uneven transmission of signals and power due to the rotation eccentricity of the rotation-side module (10) is suppressed, reliability and accuracy of transmission are improved.

In the above embodiment, the case where the rotation-side module (10) is arranged inside the fixed-side module (20) is shown. However, it is needless to say that the same effect can be obtained even if the arrangement is reversed. .

Also, the case where the signal transmission target is only the rotation-side module (10) and the fixed-side module (20) has been shown, but it is also applicable to an auxiliary mechanism in which another moving part is added to a moving part of a production machine or the like. Similarly, signals and power can be transmitted.
In this case, the configuration according to the present invention may be secondarily applied to the moving part and the accessory mechanism.

Also, the case where a data signal is transmitted from the rotating module (10) to the fixed module (20) and power is transmitted from the fixed module (20) to the rotating module (10) has been described. It goes without saying that the present invention can be applied to the case of transmitting and receiving other signals. For example, a command signal or the like may be transmitted from the fixed module (20) to the rotating module (10). Further, the power transmission frequency f2 may be modulated to transmit the power and the signal simultaneously from the fixed-side module (20) to the rotating-side module (10).

Although the case where the electromagnetic wave for transmitting the data signal is FM-modulated has been described, the same effect can be obtained by using another modulation method which is generally used in wireless communication or the like.

Furthermore, as another embodiment, assuming that each module (10) and (20) is operated in a very high or low temperature environment, cooling for temperature control is provided in each module (10) and (20). Alternatively, a heating means (not shown) may be provided. In this case, as the cooling or heating means incorporated in each of the modules (10) and (20), a cooling semiconductor element, a simple cooling device or a heating device of an adiabatic expansion type using high-pressure air is used.

[Effects of the Invention] As described above, according to the present invention, a rotating module integrally provided on a rotating body on which sensor means is mounted, and a ring-shaped module included in the rotating module and extending along the rotating direction of the rotating body. And a fixed-side module provided integrally with a stationary portion formed coaxially with the rotating body, and a transmission-side and reception-side head included in the fixed-side module and individually disposed to face each other. Ring-shaped receiving head and transmitting head, and a bearing interposed between the rotating body and the stationary part, and the rotating body and the stationary part are coaxially coupled via the bearing to be integrated into In addition, since the transmission of bidirectional electromagnetic wave signals between the fixed-side modules is performed efficiently through each transmission / reception head, high efficiency and stability of signal transmission are realized, and handling and installation conditions are improved. In addition to simplifying the matter, there is an effect that a small and highly reliable signal transmission device can be obtained.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing an embodiment of the present invention, and FIG. 2 is a block diagram showing a circuit configuration of a rotating module and a fixed module in FIG. (2) rotating body (3) stationary part (6), (8) bearing (9) temperature sensor (10) rotating module (16) signal transmission head (17) Power receiving head (20) Fixed module (23) Power transmitting head (24) Signal receiving head In the drawings, the same reference numerals indicate the same or corresponding parts.

Continuation of the front page (72) Inventor Yukio Machida 4-3-1-3- Shinisono, Sagamihara City, Kanagawa Prefecture (72) Inventor Osamu Takeda 1-2-1, Wadazakicho, Hyogo-ku, Kobe City, Hyogo Prefecture Mitsubishi Electric Corporation Kobe Works (56) References JP-A-1-161497 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) G08C 17/00

Claims (2)

(57) [Claims] 1. A rotating body on which a sensor means is mounted, a rotating module provided integrally with the rotating body, and a ring-shaped module included in the rotating module and provided along the rotating direction of the rotating body. A fixed head module provided integrally with a stationary part formed coaxially with the rotating body; and a transmission module and a reception head included in the fixed module and individually opposed to the transmission head and the reception head. A signal transmission device comprising: a ring-shaped reception head and a transmission head that are provided; and a bearing interposed between the rotating body and the stationary portion. 2. The signal transmission device according to claim 1, wherein the rotating-side module and the fixed-side module include cooling or heat-generating means for temperature control.