JP3011789B2 - Data processing device for rotating or non-rotating body - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for performing data processing on, for example, distortion of a rotating or non-rotating body.

[0002]

2. Description of the Related Art In the case of a large-capacity generator used in a power plant or the like, the amount of distortion of the rotor becomes considerably large due to its large size. Therefore, sufficient accuracy is required for measuring the distortion of the rotor even in the generator manufacturing process and in the case where an abnormality occurs in the existing generator.

FIGS. 6 and 7 are block diagrams of an apparatus for measuring the distortion of a rotating body such as a rotor. By the way, a slip ring is often used to extract electric signals from various sensors attached to a rotating body. A slip ring has a plurality of rings electrically insulated from the shaft on a shaft connected to the shaft end of the rotating body, and a plurality of lead wires from the rotating body (wires for extracting electric signals from various sensors). ) And each ring is electrically connected,
A carbon brush is applied to the outer periphery of each ring from the stationary side and slid to take out an electric signal.

In FIG. 6, a plurality of strain gauges 1 attached to arbitrary positions on a rotating body are connected to a slip ring 3 through lead wires 2. At this time, three lead wires 2 may be used for each gauge for compensating the temperature of the lead wires. The signal of the strain gauge 1 taken out from the slip ring 3 to the stationary side is passed through a bridge circuit 4 to a strain amplifier 5.
, And becomes an electric signal.

Regarding the processing of this signal, the following method is often used, especially when the number of strain gauges 1 is large. That is, in FIG. 7, a plurality of distortion amplifiers (No. 1 to N)
An electrical signal line coming out of 5 is connected to the scanner 6, where electrical or mechanical scanning is performed.

[0006] Scanning is a method of sequentially switching signal lines at a certain fixed speed, whereby a set of signal lines is formed, and an analog signal is converted to a corresponding digital signal by an A / D converter 7 and the digital computer 8 Is input to The calculation is performed according to the software input by the operator, and the graphic processing is performed or stored in the storage device.

[0007]

A problem with the prior art is that a slip ring must be used. For example, if three leads are used per point for temperature compensation of the leads, the slip ring requires three poles per point. The number of poles of a slip ring usually used is at most about 40 poles, and therefore, the number of strain gauges is limited to about 13 points.

If more points are required,
The connection must be changed in the middle of the measurement, but this requires a lot of trouble, and the data measured before and after the connection may have different test conditions.

The strain gauge measures the strain by a slight change in resistance. If a slip ring is interposed on the way to the bridge circuit, the change in the contact resistance due to the sliding of the brush and the ring is also on the stationary side. From the viewpoint of the resistance change of the strain gauge. Therefore, so-called noise enters and the S / N ratio of the signal deteriorates.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has a multi-point data signal for a rotating body or the like which can be taken out to a stationary side without passing through a slip ring. It is intended to provide a processing device.

[0011]

According to the present invention, as a means for solving the above problems, sensors are provided at a plurality of positions on a rotating body or a non-rotating body, and each data signal obtained based on a sensor signal from each sensor is provided. performs arithmetic processing using the rotating member or non-rotating object data processing apparatus, is formed on the rotating member or non-rotating side to the mounted electronic substrate, the double
Analog input signal from each sensor provided in several places
Scan sequentially and convert this to a serial digital signal.
Data signal generating means for generating the converted serial digital signal as the data signal.
A light-to-light conversion unit attached to the rotating body or the non-rotational body and converting a data signal from the data signal generation unit to an optical signal; and A configuration comprising: an optical-to-electrical conversion unit that converts an optical signal from the electrical-to-optical conversion unit into an electric signal; and an arithmetic processing unit that performs the arithmetic processing based on a signal input from the optical-to-electrical conversion unit. It is what it was.

[0012]

In the above construction, the data signal generating means for generating a serial digital signal is formed on an electronic substrate, and its size is not so large. Therefore, this data signal generation means can be attached to the rotating or non-rotating body side, that is, the measured side. And de
Data signal generation means, analog input from a plurality of sensors.
Scan the signal sequentially and convert it to a serial
Digital data.
For the data signal generating means, the number of input points of the sensor signal can be made much larger than when the slip ring is used.

[0013] The serial data signal generated by the data signal generating means is sent to an electro-optical conversion means which is also mounted on the rotating or non-rotating body side, and is converted into an optical signal. Then, this optical signal is converted into an electric signal by the optical / electrical conversion means provided opposite to the electric / optical conversion means. The arithmetic processing means performs arithmetic processing based on the input of the electric signal.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In FIG. 2, a strain gauge 1 attached to a portion where a rotating body is located is connected to a terminal 9 by a lead wire 2. There are five terminals, and three fixed resistors R are inserted between the terminal and the distortion amplifier 10 to form a bridge circuit. The fixed resistor R is selected to have the same resistance value as the strain gauge 1 and to have a change in resistance value as small as possible with respect to a change in ambient temperature.

Between the terminals 11 and 12, or between the terminals 12 and 13, resistors 14 and 15 are inserted. This is for balancing (electrically balanced) a bridge circuit composed of the strain gauge 1 and the fixed resistor R, and a resistor having an appropriate value (fixed resistor or variable resistor) as necessary. ) Is used.

The combination shown in FIG. 2 is constituted one by one for one strain gauge. FIG. 1 is a block diagram showing the configuration of the first embodiment of the present invention, in which N combination circuits 16 and N combination circuits 16 are arranged.
Scan the analog signal input from the
And a multiplexer 17 for outputting the
Digitally converts the analog signal from the
An A / D converter 18 for outputting a digital signal forms a data signal generating means, which are formed on the same electronic substrate 19.

In FIG. 1, an E / O converter 20 is connected to the A / D converter 18 by a lead wire so that an optical signal is emitted. These are all mounted inside the rotating body.

On the other hand, an O / E converter 21 for receiving an optical signal from the rotating side and converting it into an electric signal is provided on the stationary side, and this signal is input to a digital computer 22. This signal is stored and stored in an external storage device 23 attached to the digital computer 22.

A distortion amplifier, a multiplexer, an A / D
The power supply to the converter and the E / O converter is performed by the power supply 25 from the stationary side via the power supply slip ring 24.

With the above configuration, for example, when 100 strain gauges are attached to a rotating body, 100 sets of bridge circuits and strain amplifiers are required.
80mm × 40 including all elements such as / D converter
It can be configured on three 0 mm substrates. When this is combined, 80mm x 80mm x 400
The shape fits inside a mm cube. Therefore, when these are attached to a rotating body, they can be molded with a silicone rubber-based or epoxy-based molding material to withstand centrifugal force.

FIG. 3 is an explanatory view showing the structure around the rotating body in the first embodiment. In this figure, the rotating body 26
Are supported by the bearing 27 and rotate. Lead wires 29 are gathered from a strain gauge 28 attached inside the rotating body 26 to a rotating body center hole 30 and connected to a signal transmission device 31. This signal transmission device 31 is obtained by integrally molding the above-described substrate, and a light emitting element 32 is attached to the shaft end at the center of the shaft. Although the power supply slip ring 24 in FIG. 1 is not shown in FIG. 3, the slip ring 24 is actually provided at the shaft end, and the light emitting element 32 is attached to the slip ring 24.

On the other hand, on the stationary side, a light receiving element 33 is installed so as to face the light emitting element 32, and is extracted as an electric signal by an O / E converter 34. In the case of 100 strain gauge points, all signals can be measured in about 1 second.
The result can be displayed on the display of the digital computer 22. According to such a first embodiment,
It is possible to measure, calculate, display, and record a multi-point distortion signal almost instantaneously, and significantly reduce noise penetration as compared with the conventional slip ring method.

As a modification of the first embodiment, power can be supplied by using a high-frequency induction power supply instead of the power supply slip ring 24 in FIG. In this case, a transmitting antenna is required on the stationary side and a receiving antenna is required on the rotating side. However, since the contact between the rotating side and the stationary side can be completely cut off, measurement of rotating bodies rotating in special gas or liquid is required. This is effective for measurement of a high-speed rotating body that cannot use a slip ring. Further, if a storage battery is directly installed on the rotating side instead of the high frequency induction power supply, a transmitting and receiving antenna is not required.

FIG. 4 is an explanatory view of the second embodiment. Since the object to be measured, which is not a rotating body but has distortion, is exposed to a high voltage, it is impossible to take out a signal with a normal lead wire.
Alternatively, this is an example of a case involving great danger.

That is, the lead wire 29 is connected to the signal transmission device 31 from the strain gauge 28 attached to each part of the measured object 35 (for example, a high-voltage transmission line, a transformer, a current-carrying part of an electric machine, etc.) in which distortion occurs. . As described above, the signal transmission device 31 includes a distortion amplifier, a multiplexer, an A / D converter, and an E / O converter. The signal converted into light is connected via an optical fiber cable 36 to a light receiver 37 having a built-in O / E converter. From the light receiver 37, a digital electric signal is input to a digital computer and processed as in the above-described embodiment.

The reason why the optical fiber cable 36 is used is to electrically insulate it from the object to be measured. Of course, similarly to the above-described embodiment, the optical signal can be transmitted without any contact. The power supply to the signal transmission device 31 is supplied from the high-frequency induction power supply device 38 via the transmission antenna 39 and the reception antenna 40.

FIG. 5 is an explanatory view showing the third embodiment, and is an example of a case where distortion is measured for a relatively large rotating body. That is, the rotating body 41 is supported by the bearing 42, and the strain gauge 28 mounted on the rotating body 41 is connected to the signal transmission device 31 by the lead wire 29.
The signal transmission device 31 can be installed at any position as long as the rotation of the rotating body 41 is not hindered. Then, an optical signal is emitted from the light emitting element 32 in the radial direction.

On the other hand, a light receiving element 33 is installed facing the stationary side, and can be extracted as an electric signal by the O / E converter 34. However, the difference from the first embodiment shown in FIG. 3 is that the light emitting element 32 is not installed on the axis.

That is, the light-emitting element 32 and the light-receiving element 33 do not always face each other, but only have a moment of facing once per rotation of the rotating body 41. However, 1
This is enough for signal transmission of a channel or several channels. In addition, a pulse signal generator 43 for generating a pulse once per rotation is attached near the upper part of the rotating body 41 to give a signal transmission timing.
The pulse signal generator 43 may be an eddy current type non-contact displacement meter or an electromagnetic pickup, as long as it can give the signal receiving timing to the light receiving device as an electric signal.

The third embodiment shown in FIG. 5 is more practical than the first embodiment shown in FIG. This is because various components are mounted near the shaft end of the rotating shaft, and the design as shown in FIG. 1 involves some design difficulty. On the other hand, in the case of the configuration of FIG. 5, even when the distortion of the rotor of the existing generator is measured, the signal transmission device 31, the O / E converter 34, and the like can be easily attached.

In the above-described embodiment, the case where the data signal relating to the rotating body or the non-rotating body is a distortion signal has been described. However, other data signals such as a temperature signal may be used.

[0032]

As described above, according to the present invention, it is possible to take out multiple data signals of the rotating body to the stationary side without passing through the slip ring.

Therefore, the signals of the strain gauges attached to a plurality of positions of the rotating body can be measured instantaneously and as a signal having a good SN ratio. At the same time, data processing such as calculation, display, storage, etc., is performed by a digital computer. Becomes possible. Thereby, the mechanical stress state of each part of the rotating body can be monitored in real time.

Further, the present invention is not limited to the rotating body, but can be applied to the measurement of a distortion of a measured object from which a signal cannot be directly taken out with a normal signal cable for some reason.

[Brief description of the drawings]

FIG. 1 is a block diagram of a first embodiment of the present invention.

FIG. 2 is a circuit connection diagram around a strain gauge used in FIG.

FIG. 3 is an explanatory view showing a structure around a rotating body in FIG. 1;

FIG. 4 is an explanatory view of a second embodiment of the present invention.

FIG. 5 is an explanatory view of a third embodiment of the present invention.

FIG. 6 is a block diagram of a part of a conventional example.

FIG. 7 is a block diagram schematically showing a conventional example.

[Explanation of symbols]

 1, 28 sensor (strain gauge) 16 data signal generation means (combination circuit) 17 data signal generation means (multiplexer) 18 data signal generation means (A / D converter) 19 electronic board 20 electric / optical conversion means (E / O-converter 21 Optical-electrical conversion means (O / E converter) 22 Operation processing means (digital computer)

Claims (1)

(57) [Claims] 1. A data processing device for a rotating or non-rotating body, wherein sensors are provided at a plurality of positions on a rotating or non-rotating body, and arithmetic processing is performed using each data signal obtained based on a sensor signal from each sensor. In the above, the sensor is formed on an electronic board attached to the rotating body or the non-rotating body side, and is provided from each sensor provided at the plurality of locations.
Scan the analog input signal sequentially and serialize it.
Digital signal, and convert this serial
Data signal generating means for generating a digital signal as the data signal; electro-optical converting means attached to the rotating or non-rotating body for converting a data signal from the data signal generating means into an optical signal; -Provided at a stationary side position facing the light conversion means,
Optical-to-electrical conversion means for converting an optical signal from the electrical-to-optical conversion means into an electric signal; and arithmetic processing means for performing the arithmetic processing based on input of a signal from the optical-to-electrical conversion means. A data processing device for a rotating body or a non-rotating body.