JPS60230725A - Signal transmitting device from rotary body - Google Patents

Abstract

PURPOSE:To obtain a durable signal transmitting device between a rotary body and a non-rotary body by sending AC electric power supplied to a rotary transformer to an electronic circuit, generating pulses in the electronic circuit to turn on and off a light emitting element, and receiving the result by a fixed photo-electric element. CONSTITUTION:An attached body of a deviation detecting circuit 14 and a secondary coil 15b for a rotary transformer are fixed to a soft magnetic shaft supported rotatably by the bearing 12 of a support 11, and a primary coil 15a loosely fitted to the shaft 13 is fixed to a stationary holder 20 supported by a support 19, and the coil 15a is fed from an AC power source 26. A hole 16 is pierced in the shaft 13, and a light emitting element 18 is fixed at the center of inside of the open end 17, and a photo-electric element 21 is attached at the center of inside of the holder 20. AC power is supplied from the coil 15b to an electronic circuit 22 provided in the attached body 14 to generate pulses and the element is turned on and off. In such a way, on and off light is caught by the photo-electric element 21 and an on/off frequency is detected. Thus, electric signals on a rotary body are detected.

Description

DETAILED DESCRIPTION OF THE INVENTION Since electric wires cannot be used to transmit electrical signals detected in a rotating body to non-rotating parts, a special transmission method must be used.

The most common method is to use a sliding electrode called a slip ring as shown in Figures 1 and 2. In both figures, 1 is a rotating shaft, 2 is a rotating body, 3 is a commutator, and 4 5 indicates a rotating electrode, and 5 indicates a brush.

Another method is to use a so-called telemeter, which converts the signal into a radio wave signal on a rotating body and sends the signal to a non-rotating part by transmitting it through the air.

Furthermore, although this is limited to the case where the signal is an alternating current electromotive force generated on a rotating body, there is a method in which an inductive electromotive force is generated in a non-rotating part using a rotating transformer as shown in Fig. 3.
3 is a rotating core for a transformer, 7a is a coil of a 1tij core, 6b is an internal core, and 7b is a coil of the same core.

However, the slip ring type has problems with reliability during long-term use, such as wear of the electrodes and changes in contact resistance, which can easily become a major problem especially when rotating at high speeds.

On the other hand, telemeter type devices are completely non-contact and have excellent durability, but since the telemeter device uses a battery as a power source, there is a limit to the continuous use time, and the battery must be replaced regularly. Needs to be replaced. Furthermore, since the signal is first converted into radio waves and then separated again, the circuit tends to be complicated and the cost is high.

Recirculating transformers are limited to AC electromotive force, and therefore lack versatility.

As described above, all of the conventional methods have some kind of problem.

The present invention improves the problems of the conventional methods described above, and provides a signal transmission device between a rotating body and a non-rotating body that can withstand long-term use, has a simple structure, and is versatile. did.

However, a feature of the present invention is that AC power is supplied onto the rotating body by a rotating transformer, this power is supplied to an electronic circuit on the rotating body, and the electronic circuit converts signals on the rotating body into serial pulses. The pulse signal is converted into a signal (there are various formats), and the light emitting element is blinked by the pulse signal.A light receiving element facing the light emitting element is provided in the non-rotating part, and the pulse signal received by the light receiving element is converted into a pulse signal. The reason is that the original signal can be extracted by decoding it.

Embodiments of the present invention will be described below with reference to FIGS. 4 and 5.

A deflection detection circuit mounting body 14 is attached to a soft magnetic shaft 13 rotatably supported by a bearing 12 of a support body 11.
is tightly fitted, and one annular secondary coil 15b for the rotating transformer is also tightly fitted.

Further, a through hole 16 is formed through the shaft 13 along its axis, and a light emitting element 18 is appropriately fixed at the center of the inside of the shaft 13 on the open end 17 side. An immovable cap-shaped holder 20 supported by a support 19 is fitted onto the open end side of the shaft 13 via a pairing 21, and the end plate 2a of this holder
A light receiving element 21 that receives light from the light emitting element is attached to the center of the inner surface of the light emitting element.

Further, the holder 20 includes the transformer secondary coil 5.
Corresponding to b, an annular primary coil 5a loosely fitted to the shaft 13 is fixed, and the coil 5a is supplied with an AC power source 22, for example, which is picked up by the holder 20. ) i
: It is supposed to be done.

In addition, the light emitting element 18 is electrically energized in a continuous manner as the shirt eye 3 or other rotating body rotates, causing the light emitting element 18 to blink, and the light receiving element 21 captures this blinking and performs measurement and measurement.
A control circuit detects the number of blinks and uses the detection signal to control the rotation of the associated rotation mechanism.

There are various means for energizing a light emitting element by rotating a rotating body, and an example thereof will be explained with reference to FIG.

A signal wave modulation pulse circuit 22 is provided to the deviation detection mounting body 14 that is firmly fitted to the shaft 13, and the alternating current from the secondary coil 15b is also applied to the conductor 23.
Subsection 1) Also, the mounting body 14
is provided with a deviation detection sensor 24, and when a deviation occurs with respect to the detected part 25, a deviation signal is sent to the signal wave modulation pulse circuit 2.
2, and a pulse current is supplied from the same circuit to the light emitting element 18 through a conductor a26.

In the device of the embodiment described above, the coil 15a and the coil 15
and b are mutually induced by a soft magnetic shaft, forming one rotating transformer.

Therefore, when AC power is applied to the coil 15a, an electromotive force is generated in the coil 15b, and by rectifying the electromotive force of the coil 15b, it can be made into a DC power source.This electromotive force can be used to drive various electronic circuits. It is possible to transmit signals according to the above principle.

Note that depending on the structure of the rotating body, it may be preferable to connect the holder side shown in FIGS. 4 and 5 to the rotating body and connect the shaft to the non-rotating part.

In such a case, a light receiving element may be provided on the shaft, a light emitting element may be provided on the holder, and power may be supplied to the coil 15b on the shaft side.

Furthermore, in the rotary transformer composed of the coils 15a, 15b and the shaft, by appropriately selecting the number of turns of the coils 15a, 15b, the voltage of the electromotive force supplied to the rotating body can be arbitrarily selected. There is no problem with the power supplied to the coil on the non-rotating part side even if it is a commercial power supply.

Furthermore, this embodiment has the following advantages over the conventional method mentioned first.

(1) Since no sliding electrodes are used, durability and reliability are excellent.

(2) Compared to a telemeter, the signal processing circuit is much simpler and the cost is lower.

(3) By designing the electronic circuit placed on the rotating body according to the purpose, it can be applied to a wide range of applications (it is versatile).

(4) Since light is used for signal transmission, it is not affected by electrical noise and high-speed signal transmission is possible.

(5) Since the transmitted signal is a pulse signal, it is easy to input it to the converter.

A field of use and application of the device of the present invention is a wire drum type liquid level gauge, which will be described below.

One typical type of high-precision wire drum type liquid level gauge is the one shown in Figure 6.

That is, a wire is wound around a spiral groove cut on the outer periphery of the drum, and a liquid surface sensor called a displacer is provided at one end of the wire.

The lower surface of the displacer is submerged in the liquid, and the rotation angle of the drum is controlled by a drive device such as a motor so that the tension of the wire between the drum and the displacer is constant, and the displacer accurately follows the liquid level. do.

This is because the sinking lid of the displacer is thick (
The increased buoyancy of the displacer reduces the tension on the tie wire, so the motor rotates the drum, pulling the displacer up and returning the tension to the standard value.

Conversely, when the amount of sinking of the displacer becomes smaller, the tension of the wire increases due to the decrease in buoyancy, and the drum rotates to feed out the wire, causing the displacer to sink and return the tension to the reference value.

Due to the above action, the displacer always maintains a constant stuttering position and moves with the liquid level.

Therefore, the liquid level can be determined from the rotation angle of the drum.

In such a liquid level gauge, it is extremely important to accurately measure the tension of the wire for high precision measurement.

One of the most common and excellent means for measuring wire tension is the device shown in FIG. 6-B.

That is, when a shaft that rotates together with the drum and @ driven by a motor are connected via a soft spring, the deviation of the rotation angles of the two shafts is proportional to the torque applied to the drum.

Since the diameter of the drum is approximately constant, the torque applied to the drum is proportional to the tension of the wire, and the tension of the wire can be determined by measuring the deviation of the rotation angle.

A general method for measuring minute displacements can be easily applied to measuring the rotation angle deviation. Examples include differential transformers, capacitive displacement sensors, magnetic displacement sensors, and optical sensors.

Figure 6-○ is an example of a magnetic sensor, in which a magnet is installed on the shaft that rotates with the drum, and a magnetic pickup is attached to the drive shaft. Convert to signal.

Regardless of the type of sensor used, it is necessary to supply power to the sensor and transmit the output signal from the sensor to the motor control circuit, but since both of the above two axes rotate endlessly, the power Conductive wires cannot be used for the supply of signals and for the transmission of signals.

Therefore, a means for supplying power to the rotating body and transmitting signals from the rotating body is required.

Conventional liquid level gauges use slip rings that use the sliding brushes mentioned above, but the slip rings have the problems mentioned above, and improvements are desired.

7 and 8 show an example in which the device of the present invention is applied to the liquid level gauge shown in FIG.
27 is a control circuit, 27 is a motor, 28 is a gear, 29 is a spur gear tightly fitted to the shaft, 30 is a winding drum, 31 is a displacer, 32 is a hanging wire, and 33 is a helix connecting the drum shaft and the shaft 13. The spring is shown, and the others are the fourth
, 5 has substantially the same structure as the device of the present invention shown in FIGS.

In this liquid level gauge, when the amount of stuttering in the displacer increases or decreases due to changes in the liquid level of the heavy liquid to be measured, and the tension of the wire 31 changes, the drum 30 is activated by the spring 33 or the apparent weight due to the change in the buoyancy of the displacer. (Weight minus buoyancy from mass)
The magnet 25 of the drum is deviated from the sensor 24 on the shaft side. The sensor 24 captures this deviation, and the signal wave modulation pulse generation circuit sends the light emitting element 1 to the light emitting element 1.
8 and lights up the light emitting element. The light receiving element 21 detects this and activates the control circuit 26, which drives the motor 27 to rotate the shaft 13 using gears 28 and 29 until the sensor 22 is in a position facing the magnet 25 of the drum. and repeat the above operation if the liquid level continues to fluctuate.

Therefore, the control circuit measures the number of points of the light emitting element,
The indicator 34 allows the liquid level to be indicated on a digital display.

The device of the present invention can also be applied to liquid level gauges using other types of sensors, and depending on the configuration of the motor control circuit, the pulse signal can be used as it is as an input signal without converting it to a voltage signal again.

Furthermore, the device of the present invention is not limited to wire drum type liquid level gauges.
It can be widely used for signal transmission from sensors that require a power source provided on a rotating body that rotates endlessly.

[Brief explanation of drawings]

1 to 3 are views showing each side of a conventional transmission device, FIG. 4 is a perspective view showing an example of the device according to the present invention, FIG. 5 is a longitudinal sectional front view of the same device, and FIG. Figures A to 6-0 are diagrams showing a conventional wire drum type liquid level gauge, Figure 7 is a perspective view showing an example of a wire drum type liquid level equipped with the device of the present invention, and Figure 8 is a vertical front view. be. In the figure 11 Support body 12 Bearing 13 Shaft 14 Deflection detection circuit mounting body 15a, 1
5b) Lance coil 16 Through hole 17 Open end 1
8 Light-emitting element 19 Support body 20 Holder 21 Light-receiving element Applicant Tokyo Keiso Co., Ltd. Representative Patent attorney Former 1) Qing Dynasty Figure 1 Figure 2 Procedural amendment June 5, 1980 1 Indication of case 1988 Patent Application No. 87114 2 Title of the invention
Signal transmission device from a rotating body 3 Relationship with the case of the person making the amendment Applicant's address. A0. ．． Tokyo Keiso Co., Ltd. 4. Details of the amendment as stated in the appendix by the agent (1) The statement in the scope of claims in the specification is corrected as follows. ``A secondary rotating coil for a rotating transformer is firmly fitted into a rotating shaft having a through hole formed in the axial direction, and a primary coil is loosely fitted into the rotating shaft and supported by a support body. A light emitting element and a light receiving element facing each other are provided in the open end and a non-rotating holder corresponding to the open end, and a signal wave modulation pulse circuit is provided as appropriate on the shaft or a rotating body connected to the shaft. The secondary conductor of the transformer and the conductor of the light emitting element are connected through the through hole, and electricity is transmitted to the light emitting element by a rotating transformer to the signal wave modulation pulse circuit, so that the light emitting element receives the electrical signal. A signal transmission device from a rotating body, characterized in that the rotating body is made to blink by a pulse current corresponding to a pulse current, and a light-receiving element receives the blinking light and extracts the original electrical signal.'' (2) In the specification. , page 4, line 19, "21" is corrected to "12". (3) Same book, page 4, line 20, add "20" next to "holder". (4) In the same book, page 4, line 20, "2bo" is deleted. (5) Same book, page 5, line 4, "5b" is corrected to "15b J." (6) Same book, page 5, line 5, "5a" is corrected to [15a J. (7) Same book, page 5, line 6, "5a" is corrected to l'-15aJ. (8) Same book, page 5, line 7, “22” is corrected to “26”. (9) Same book, page 5, line 8 to page 6, line 5, “Also...
...is supplied. ” to “Also, the light emitting element 1
8 is energized in pulses by an electronic circuit provided on the shaft 13 or a rotating body connected thereto, and is made to blink;
The light-receiving element 21 captures this blinking, a measurement circuit detects the blinking frequency, and the detection signal detects the electrical signal on the rotating body. There are various methods of applying electric signals on the rotating body and means of energizing the light emitting elements, and examples thereof will be explained with reference to FIG. A signal wave modulation pulse circuit 22 is provided on the deviation detection mounting body 14 that is firmly fitted to the shaft 13, and AC power from the secondary coil 15b is applied to this through a conductor 23b, converting it into DC current, and supplying power to the circuit 22. shall be. Further, the mounting body 14 is provided with a deviation detection sensor 24, and when a deviation occurs with respect to the detected part 25, a deviation signal is input to the signal wave modulation pulse circuit 22, and from the same circuit to the light emitting element 18. A pulse current corresponding to the deflection signal is supplied through the conductor 23a. ” is corrected. (10) In the same book, page 6, line 12, "electromotive force" is corrected to "DC power supply". (11) In the same book, page 11, line 6, "31" is corrected to "32" and "32" to "31". (12) In the same book, page 11, line 12, ``resilience'' is added next to ``33''. (13) Same book, page 11, line 15, add ``side'' after ``drum.'' (14) Same book, page 11, line 17, add "22" next to "circuit". (15) In the same book, page 11, line 17, add ``pulse current corresponding to the deviation'' after ``from''. (16) In the same book, page 11, line 18, "lit" is corrected to "flashing". (17) In the same book, page 12, line 1, "22" is corrected to "24". (18) In the same book, page 12, line 4, "number of blinking light emitting elements from VC" is corrected to "rotation angle of drum at". (19) Add the numeral "12" to FIG. 5 of the drawings as shown in red ink on the attached drawing.

Claims (1)

[Claims] A secondary rotating coil for a rotating transformer is firmly fitted to a rotating shaft having a through hole formed in the axial direction, and a primary coil is loosely fitted to the rotating shaft and supported by a support body, and the opening of the rotating shaft is A light-emitting element and a light-receiving element are provided in the end portion and a non-rotating holder corresponding to the open end portion, and a signal wave changing pulse circuit is appropriately provided on the shaft.
The secondary conductor of the transformer and the conductor of the light emitting element are connected to this through the through hole, and the alternating current input from the rotary transformer to the signal wave modulation pulse circuit is rectified, modulated, and transmitted to the light emitting element. A rotating body characterized in that the light emitting element is caused to blink by a pulse current accompanying rotational displacement of a rotating shaft, and the light receiving element receives the blinking light and extracts the original rotational pulse signal. A signal transmission device from