JP4062427B2 - Rolling device operation status detection device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a rolling device operating state detection device suitable for use in rolling devices such as rolling bearing devices, linear guides, and linear motion devices such as ball screws.In placeRelated.
[0002]
[Prior art]
As a method for detecting the operating state of a railway vehicle bearing, as shown in FIG. 20, a sensor unit 200 including a rotation speed sensor, a temperature sensor, and a vibration sensor is provided near the bearing 101 of the axle 100, and the rotation speed sensor is used. The rotation speed of the axle 100 is detected to perform rotation control to prevent uneven wear of the wheel, the temperature of the bearing 101 is estimated by a temperature sensor, and abnormality such as seizure or peeling of the bearing 101 is detected, and the bearing 101 is detected by a vibration sensor. Attempts have been made to detect abnormalities such as delamination by detecting vibrations.
In the illustrated example, a double-row tapered roller bearing is used as the bearing 101, and the sensor unit 200 is attached to a cover 103 that closes the outer end opening of the bearing box 102 that houses the bearing 101.
[0003]
In addition, a method has been proposed in which detection signals from the sensors of the sensor unit are transmitted to a receiving device through a single signal line (see, for example, Patent Document 1). According to the method disclosed in this patent document, the sensor unit 200 synthesizes the detection signals of the rotation speed sensor 201, the temperature sensor 202, and the vibration sensor 203 by the signal synthesizer 204, as shown in FIG. The data is sent to the receiving apparatus 300 through two lines, a power line 205a and a signal line 205b.
[0004]
In the receiving apparatus 300, the detection signals of the sensors 201 to 203 are separated from the transmitted composite signal. According to this sensor detection signal transmission method, since the detection signals of a plurality of sensors can be transmitted at the same time by two lines of the power line 205a and the signal line 205b, the number of signal lines can be reduced. In addition, the cost and weight can be reduced, and the advantage that the design for arranging the signal lines is facilitated can be obtained.
[0005]
[Patent Document 1]
JP 2001-43475 (4th page, right column, 4th line to 5th page, left column, 30th line, FIG. 1)
[0006]
[Problems to be solved by the invention]
However, in the conventional sensor detection signal transmission method described above, the peak value of the detection signal is set to each sensor so that the reception device can recognize each detection signal transmitted by one signal line. Or the time-axis width is changed, or the identification information unique to each sensor is combined with the detection signal, so that the circuit configuration of the transmission source sensor unit and the transmission destination receiver is complicated. There was a problem.
[0007]
  The present invention has been made in view of the above circumstances, and it is possible to simplify the circuit configuration while adopting a configuration in which detection signals of a plurality of sensors are transmitted at a time using a small number of signal lines. DressPlaceThe purpose is to provide.
[0008]
[Means for Solving the Problems]
  The rolling device operating state detection device of the invention according to claim 1 is:A first rotational speed detecting means for detecting a rotational direction of a rotational shaft of the rolling device and outputting a rotational speed signal; and a first rotational speed detecting means for detecting the rotational direction of the rotational shaft and 0 degrees and 180 degrees. Second rotation speed detection means for outputting a rotation speed signal having a phase difference other than the rotation speed of the rotation shaft based on the phase difference between the rotation speed signals of the first rotation speed detection means and the second rotation speed detection means. Rotation direction detection means for detecting a direction and outputting the result as a rotation direction signal indicated by binary values of high level and low level, and either one of the first rotation speed detection means or the second rotation speed detection means An adding means for adding a rotation speed signal and a rotation direction signal of the rotation direction detecting means to combine them into one signal; a signal transmission means for sending the output signal of the addition means to a destination by transmission through a current loop; First comparison means for comparing with a first reference value for extracting the rotational speed signal from the combined signal sent by the signal transmission means, and the rotation direction signal from the synthesized signal sent by the signal transmission means. Signal extracting means for extracting a low-frequency signal including the second comparing means for comparing with a second reference value for converting the low-frequency signal extracted by the signal extracting means into a binary value of a high level and a low level; It is characterized by comprising.
[0012]
According to this configuration, a rotation direction signal indicated by two values of a high level and a low level is generated from two rotation speed signals having a phase difference other than 0 degrees and 180 degrees, and the low frequency rotation direction signal and two A rotation speed signal is added to any one of the rotation speed signals to generate and transmit one combined signal. At the transmission destination, a first reference value for extracting the rotation speed signal from the transmitted combined signal And the rotation speed signal is extracted, and the low frequency signal of the combined signal is extracted. Then, the rotation direction signal is compared with the second reference value for converting the signal into a binary value of high level and low level. Since it is extracted, the circuit configuration is different from that of the prior art in which each detection means uses a method in which the peak value of the detection signal and the width in the time axis direction are changed, or a combination of identification information unique to each detection means and the detection signal is adopted. Simplification of It is possible to provide an inexpensive rolling device operation status detection device.
[0013]
Further, since the synthesized signal is transmitted through the current loop, noise resistance can be improved as compared with the case where the synthesized signal is transmitted through the voltage output signal.
[0014]
  Claim2The rolling device operating state detection device of the invention according to claim1In the rolling device operating state detection device according to the invention, the signal transmission means outputs a voltage instead of a current loop output.
[0015]
According to this configuration, although the synthesized signal is output as a voltage instead of the current loop output, one extra ground line is required, but no means for converting to the current loop output is required, and the current is not transmitted at the transmission destination. Since a resistor for forming a loop is not necessary, the cost can be reduced when the distance to the transmission destination is not long.
[0016]
  Claim3The rolling device operating state detection device according to the invention includes a first detection unit that outputs a low-frequency signal, a second detection unit that outputs a high-frequency signal, and a low-frequency detection signal from the first detection unit. And a first addition means for adding a high-frequency detection signal from the second detection means to combine them into one signal, and a first signal for sending the combined signal from the first addition means to the transmission destination by transmission through a current loop. Signal transmission means, first signal extraction means for extracting a detection signal of the first detection means from the combined signal sent by the first signal transmission means, and the signal sent by the first signal transmission means Second signal extraction means for extracting the detection signal of the second detection means from the combined signal, first rotation speed detection means for detecting the rotation direction of the rotation shaft of the rolling device and outputting a rotation speed signal, and the rotation Detects the rotation direction of the shaft before The first rotational speed detecting means, the second rotational speed detecting means for outputting a rotational speed signal having a phase difference other than 0 degrees and 180 degrees, and the respective rotational speeds of the first rotational speed detecting means and the second rotational speed detecting means. Rotation direction detection means for detecting the rotation direction of the rotation shaft based on the phase difference of the signals and outputting the result as a rotation direction signal indicated by binary values of high level and low level; and the first rotation speed detection means or the A second addition means for adding one of the rotation speed signals of the second rotation speed detection means and the rotation direction signal of the rotation direction detection means to combine them into one signal; and an output signal of the second addition means Is transmitted to the destination by transmission through a current loop, and a first ratio for comparison with a first reference value for extracting a rotational speed signal from the combined signal sent by the second signal transmission means Means, a signal extraction means for extracting a low frequency signal including the rotation direction signal from the synthesized signal sent by the second signal transmission means, and a low frequency signal extracted by the signal extraction means at a high level. And a second comparison means for comparing with a second reference value to be converted into a low level binary value.
[0017]
  According to this configuration, the claims1Effects of the inventionIn addition to this, a filter that adds the detection signals of a plurality of detection means using a difference in frequency to generate and transmits one composite signal, and passes only the frequency band of the output signal of each detection means at the transmission destination. Is used to extract the output signal of each detection means, so that the detection signal peak value and the width in the time axis direction are changed for each detection means, or the identification information and detection signal unique to each detection means are provided. The circuit configuration can be simplified as compared with the prior art employing a combination method, and an inexpensive rolling device operating state detection device can be provided.Further, since the rotation speed signal and the rotation direction signal can be obtained at the same time in addition to the signals obtained from the first detection means and the second detection means, the operating condition of the rolling device can be grasped more accurately. Further, the number of electric wires can be reduced by using a common power line for the circuit that synthesizes and outputs the signals obtained from the first detection means and the second detection means and the circuit that synthesizes and outputs the rotation speed signal and the rotation direction signal. And cost reduction is possible.
[0018]
  Claim4The rolling device operating state detection device of the invention according to claim3In the rolling device operating state detection device according to the invention, the first signal transmission means or the second signal transmission means outputs a voltage instead of a current loop output.
[0019]
According to this configuration, although the synthesized signal is output as a voltage instead of the current loop output, one extra ground line is required, but no means for converting to the current loop output is required, and the current is not transmitted at the transmission destination. Since a resistor for forming a loop is not necessary, the cost can be reduced when the distance to the transmission destination is not long.
[0020]
  Claim5The rolling device operating state detection device of the invention according to, ContractClaim3Or claims4In the rolling device operating state detection device according to the invention, the first detection means is a temperature sensor, and the second detection means is a vibration sensor.
[0021]
According to this configuration, the temperature detection signal output from the temperature sensor is an analog signal having a small temporal change, and the vibration detection signal output from the vibration sensor is basically an analog signal having only an AC component. By utilizing this difference, these signals can be easily separated at the transmission destination.
[0022]
  Claim6The rolling device operating state detection device of the invention according to, ContractClaim1Claims from5In the rolling device operating state detection device according to any one of the above, the first rotation speed detection means and the second rotation speed detection means each output an analog rotation speed signal.
[0023]
According to this configuration, the rotation speed signal output from the rotation speed detection means is an analog signal, so that it is possible to suppress the generation of electromagnetic induction noise that occurs at the time of a sharp rise or fall when a digital signal is output. This is a signal that combines the temperature and vibration even if the signal line that sends the signal that combines the temperature and vibration and the signal line that sends the signal that combines the rotation speed signal and the rotation direction signal are sent by the same multi-core electric wire. Electromagnetic induction noise that falls is reduced.
[0024]
  Claim7The rolling device operating state detection device of the invention according to claim 1 to claim 16In the rolling device operating state detecting device according to any one of the above, the rolling device is a rolling bearing device, and the operating state of the rolling bearing device is detected.
[0025]
According to this configuration, it is possible to provide an inexpensive rolling device operating state detecting device capable of detecting the operating state of the rolling bearing device.
[0026]
  Claim8The rolling device operating state detection device of the invention according to claim 1 to claim 16In the rolling device operating state detecting device according to any one of the above, the rolling device is a linear motion device, and the operational status of the linear motion device is detected.
[0027]
According to this configuration, it is possible to provide an inexpensive rolling device driving state detection device that can detect the driving state of the linear motion device.
[0028]
  According to a ninth aspect of the present invention, there is provided the rolling device operating state detecting device according to the fifth aspect, wherein the first signal extracting means is a low-pass filter, and the second signal extracting means. Is a high-pass filter.
[0029]
  According to this configuration, the temperature detection signal output from the temperature sensor can be easily extracted by passing through the low-pass filter, and the vibration detection signal output from the vibration sensor can be easily extracted by passing through the high-pass filter.
[0030]
  A rolling device operating condition detecting device according to a tenth aspect of the present invention is the rolling device operating condition detecting device according to any one of claims 1 to 9, wherein the signal for extracting a low frequency signal including the rotation direction signal. The extraction means is a low-pass filter.
[0031]
  According to this configuration, a low-frequency signal including the rotation direction signal can be easily extracted by passing the low-pass filter.
[0034]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the drawings.
FIG. 1 is a block diagram showing the configuration of the rolling device operating state detection device according to the first embodiment of the present invention.
In this figure, the rolling device operating condition detecting device of the present embodiment detects, for example, the operating condition of a railway vehicle bearing, and includes a temperature sensor 11, a vibration sensor 12, and rotational speed sensors 13-1 and 13. -2 and the temperature detection signal and vibration detection signal of the sensor unit 10 are received through one signal line 30, and the rotation speed signal and the rotation direction signal are received as one signal. And a receiving device 40 for receiving via the line 31.
[0035]
The temperature sensor 11, the vibration sensor 12, and the rotation speed sensors 13-1 and 13-2 are attached to the cover 103 that closes the outer end opening of the bearing housing 102 in the vicinity of the bearing 101 of the axle 100 as shown in FIG.
[0036]
The sensor unit 10 includes a temperature sensor 11 as a first detection means, a vibration sensor 12 as a second detection means, and rotational speed sensors 13-1 and 13-2 as first and second rotational speed detection means. The addition circuit 14 which is a first addition means for adding the temperature detection signal output from the temperature sensor 11 and the vibration detection signal output from the vibration sensor 12, and the combined signal from the addition circuit 14 is transmitted by a current loop. Rotation direction detection that is a rotation direction detection means that generates a rotation direction signal based on the rotation speed signals of the current loop output conversion circuit 15 that is the first signal transmission means that performs rotation and the rotation speed sensors 13-1 and 13-2. An addition circuit which is a second addition means for adding the circuit 16 and the rotation speed signal output from the rotation speed sensor 13-1 and the rotation direction signal output from the rotation direction detection circuit 16. And 7, and a current loop output conversion circuit 18 is provided with a synthesized signal from the adder circuit 17 is a second signal transmission means for transmitting by the current loop. The sensor unit 10 is supplied with power supply voltage from the receiving device 40 via the power supply line 32 and is supplied to the current loop output conversion circuits 15 and 18. Further, here, the temperature sensor 11, the vibration sensor 12, and the addition circuit 14 are supplied with power necessary for operation from the current loop output conversion circuit 15, and similarly the rotation speed sensors 13-1 and 13-2, and the rotation direction detection. The circuit 16 and the adder circuit 17 are supplied with power necessary for operation from the current loop output conversion circuit 18.
[0037]
The adder circuit 14 outputs a signal obtained by combining the temperature detection signal and the vibration detection signal as shown in FIG. In this figure, (a) shows the waveform of the temperature detection signal, (b) shows the waveform of the vibration detection signal, and (c) shows the waveform of the combined signal obtained by adding the AC components of the temperature detection signal and the vibration detection signal. Since the temperature detection signal output from the temperature sensor 11 is an analog signal with a small temporal change, and the vibration detection signal output from the vibration sensor 12 is basically an analog signal having only an AC component, the difference in frequency is used. By doing so, the receiving device 40 can easily separate these signals. Details of this will be described later. In the vibration detection signal of the vibration sensor 12 in (b), 0G is a waveform when no vibration is applied.
[0038]
From the current loop output conversion circuit 15, the output signal of the adder circuit 14 converted into a current loop output is output to the signal line 30. The rotation speed sensors 13-1 and 13-2 magnetically detect a peak portion or valley portion of a magnetic gear attached to an axle or the like, and output the rotation speed as a digital signal of a rectangular wave. In this case, as shown in FIG. 4, the phase difference between the output of the rotational speed sensor 13-1 and the output of the rotational speed sensor 13-2 is set to 90 degrees. (A) of this figure is a waveform of the rotational speed signal of the rotational speed sensor 13-1, and (b) is a waveform of the rotational speed signal of the rotational speed sensor 13-2. In the present embodiment, the phase difference between the output of the rotational speed sensor 13-1 and the output of the rotational speed sensor 13-2 is 90 degrees. You may take such a value.
[0039]
The rotation direction detection circuit 16 outputs a rotation direction signal by comparing the rotation speed signals of the rotation speed sensors 13-1 and 13-2. That is, using the D flip-flop, the rotational speed signal Va output from the rotational speed sensor 13-1 is converted into the rising portion of the rotational speed number Vb output from the rotational speed sensor 13-2 ((b) in FIG. 4). 5), a rotation direction signal S as shown in FIG. 5 is obtained.
[0040]
In this case, in the clockwise direction (CW), the level of the rotational speed signal Va of the rotational speed sensor 13-1 with respect to the rising portion of the rotational speed signal Vb of the rotational speed sensor 13-2 is High level, and counterclockwise (CCW) Then, since the level of the rotation speed signal Va of the rotation speed sensor 13-1 with respect to the rising portion of the rotation speed signal Vb of the rotation speed sensor 13-2 is Low level, the level of the rotation direction signal S is High in the clockwise direction. It becomes Low in the counterclockwise direction. The rotation direction detection circuit 16 outputs such a binary rotation direction signal S of High and Low. The rotation direction signal S can be regarded as a low frequency signal having a low frequency because the rotation direction is not changed many times in a short time. A signal obtained by synthesizing the rotation speed signal Va of the rotation speed sensor 13-1 and the rotation direction signal S as shown in FIG.
[0041]
On the other hand, the receiving device 40 includes a power output terminal 41, signal input terminals 42 and 43, resistors 44 and 45 for forming a current loop, low-pass filters 46 and 52 as signal extraction means, and a high-pass as signal extraction means. The filter 48 includes comparators 50 and 53 as comparison means, and signal output terminals 47, 49, 51 and 54. A power supply voltage Vs is output from the power supply output terminal 41. The output power supply voltage Vs is applied to the sensor unit 10 via the power supply line 32. A current loop output of the current loop output conversion circuit 15 of the sensor unit 10 is input to the signal input terminal 42 via the signal line 30.
[0042]
A current loop output of the current loop output conversion circuit 18 of the sensor unit 10 is input to the signal input terminal 43 via the signal line 31. The resistor 44 is inserted between the signal input terminal 42 and the ground, and forms a current loop by the current loop output conversion circuit 15. The resistor 45 is inserted between the signal input terminal 43 and the ground, and forms a current loop by the current loop output conversion circuit 18.
Strictly speaking, as shown in FIG. 2, the current loop output is a twisted pair in which a power line 32 and a signal line 30 of a circuit for synthesizing and outputting temperature and vibration signals are paired, and a rotation speed signal and a rotation direction signal. The power supply line 34 and the signal line 31 of the circuit that outputs the combined signal obtained by adding together are transmitted as a twisted pair. In this embodiment, the two power supply lines 32 and 34 are used as one signal line. It is transmitted with 3 wires including 2 wires. Therefore, in FIG. 1, one power supply line can be reduced as compared with FIG. 2, and the cost can be reduced.
[0043]
The low-pass filter 46 extracts a temperature detection signal from the current loop output from the current loop output conversion circuit 15. Then, the extracted temperature detection signal is output from the signal output terminal 47. FIG. 7A is a waveform diagram of the temperature detection signal extracted by the low-pass filter 46. As described above, the analog detection signal from the temperature sensor 11 having a small temporal change has only a low frequency component, and therefore can be easily extracted by passing through the low-pass filter 46. The high pass filter 48 extracts a vibration detection signal from the current loop output from the current loop output conversion circuit 15. Then, the extracted vibration detection signal is output from the signal output terminal 49. FIG. 7B is a waveform diagram of the vibration detection signal extracted by the high pass filter 48. Since the detection signal from the AC component vibration sensor 12 has only a high frequency component, it can be easily extracted by passing it through the high pass filter 48.
[0044]
As described above, since the frequency ranges are different, even if the temperature detection signal of the temperature sensor 11 and the vibration detection signal of the vibration sensor 12 are added and transmitted as a single signal, the temperature just by passing through the low-pass filter 46 on the receiving device 40 side. A detection signal is obtained, and a vibration detection signal can be obtained only by passing through the high-pass filter 48.
[0045]
The comparator 50 of the receiving device 40 extracts the rotation speed signal from the current loop output from the current loop output conversion circuit 18. As shown in FIG. 6, the comparator 50 is set with a threshold value Th <b> 1 that is a first reference value for extracting a rotation speed signal. This threshold value Th1 is a value at which the rotational speed signal can be detected both in the clockwise direction and in the counterclockwise direction, and the current exceeding the threshold value Th1 is compared with the current loop output from the current loop output conversion circuit 18. A loop output is obtained as a rotation speed signal. The rotation speed signal extracted by the comparator 50 is output from the signal output terminal 51. FIG. 8 is a waveform diagram of the rotation speed signal extracted by the comparator 50.
[0046]
The low-pass filter 52 extracts a low frequency component signal from the current loop output from the current loop output conversion circuit 18. FIG. 9 shows a low-frequency component signal extracted by the low-pass filter 52. This low frequency signal includes a rotation direction signal. The comparator 53 extracts a rotation direction signal from the low frequency component signal extracted by the low pass filter 52. The rotation direction signal extracted by the comparator 53 is output from the signal output terminal 54. As shown in FIG. 9, the comparator 53 is set with a threshold value Th2 that is a second reference value for obtaining a rotation direction signal. This threshold value Th2 is a value that exceeds the level of the counterclockwise rotation direction signal and is equal to or less than the level of the clockwise rotation direction signal. By comparing this threshold value Th2 with the low-frequency component signal extracted by the low-pass filter 52, a rotation direction signal as shown in FIG. 10 is obtained.
[0047]
By comparing the current loop output from the current loop output conversion circuit 18 with a threshold value Th4 and a threshold value Th3 as shown in FIG. 6, it is possible to separate and extract a clockwise pulse and a counterclockwise pulse. .
[0048]
The rolling device operating condition detection device of the present embodiment is configured as described above.
The sensor unit 10 adds a low-frequency temperature detection signal and a high-frequency vibration detection signal to generate one signal, converts the combined signal into a current loop output, and receives the signal via a single signal line 30. The rotation direction is detected from the rotation speed signals of the two rotation speed sensors 13-1 and 13-2 which are sent to the device 40 and the phase difference is 90 degrees, and the rotation direction signal and the rotation speed of the rotation speed sensor 13-1 are detected. The signals are added to generate one signal, and the combined signal is converted into a current loop output and sent to the receiving device 40 via one signal line 31.
[0049]
In the receiving device 40, the temperature detection signal is extracted from the current loop output sent from the sensor unit 10 via the signal line 30 by the low-pass filter 46, the vibration detection signal is extracted by the high-pass filter 48, and the signal line 31 is further connected. The rotation speed signal is extracted by the comparator 50 from the current loop output sent from the sensor unit 10 via the low-pass filter 52 and the comparator 53.
[0050]
As described above, the rolling device operating state detection device according to the present embodiment includes the temperature detection signal of the temperature sensor 11 that outputs an analog signal having a low frequency and the vibration sensor 12 that outputs an analog signal having a frequency higher than that of the temperature sensor 11. Are combined with the vibration detection signal to generate one signal (first combined signal), and from the rotation speed signals of the rotation speed sensors 13-1 and 13-2 that output digital signals whose phases are different by 90 degrees. A rotation direction signal is obtained, the rotation direction signal and the rotation speed signal of the rotation speed sensor 13-1 are combined to generate one signal (second combined signal), and the generated first combined signal is signaled. The line 30 sends the second combined signal to the receiving device 40 via the signal line 31, and the receiving device 40 extracts the temperature detection signal by the low-pass filter 46 using the difference in frequency, Extract the vibration detection signal at 48, to extract the rotational speed signal in the comparator 50, further extracts a rotational direction signal by the low pass filter 52 and a comparator 53.
[0051]
Therefore, since the difference in the frequency of the sensor itself is used, a method of changing the peak value of the detection signal and the width in the time axis direction for each sensor, or combining the identification information and the detection signal unique to each sensor is adopted. Compared with the prior art, the circuit configuration can be simplified, and an inexpensive rolling device operating state detection device can be provided.
[0052]
In addition, since the combined signal of the temperature detection signal and the vibration detection signal and the combined signal of the rotation speed signal and the rotation direction signal are transmitted by the current loop, noise resistance is improved compared to the case of transmitting by the voltage output signal. Can be increased.
[0053]
In the present embodiment, the output signals of the rotation speed sensors 13-1 and 13-2 are digital signals, but may be analog signals by analog output Hall ICs or MR (Magneto Resistive) elements. . In this case, when the outputs of the rotation speed sensors 13-1 and 13-2 are digital signals and the three signal lines 30 to 32 are accommodated in the same cable, the signals of the rotation speed sensor sensors 13-1 and 13-2 are displayed. Although noise is likely to be induced in the combined signal of the temperature detection signal and the vibration detection signal in the cable due to electromagnetic induction generated at the rise and fall of the motor, the outputs of the rotation speed sensors 13-1 and 13-2 are converted into analog signals. As a result, the output waveform synthesized by the adder circuit is substantially sinusoidal, and there is no steep rise or fall of the signal.Therefore, noise is generated in the synthesized signal of the temperature detection signal and vibration detection signal in the same cable by electromagnetic induction. Is less induced.
[0054]
Incidentally, when the outputs of the rotation speed sensors 13-1 and 13-2 are analog signals, the circuit configuration in that case is the same as that when digital signals are used. The signal of each part when it is set as an analog signal is as follows.
The rotation speed signal output from the rotation speed sensor 13-1 is as shown in FIG. 11, and the rotation speed signal output from the rotation speed sensor 13-2 with a phase difference of 90 degrees is as shown in FIG. Become. The rotation direction signal generated by the rotation direction detection circuit 16 is as shown in FIG. That is, it becomes the same as FIG. However, the rotation direction signal of the rotation direction detection circuit 16 in this case is slightly different from the case where the outputs of the rotation speed sensors 13-1 and 13-2 are digital signals.
[0055]
Further, a signal obtained by adding the rotation speed signal output from the rotation speed sensor 13-1 and the rotation direction signal output from the addition circuit 17 is as shown in FIG. The rotation speed signal obtained by extracting the synthesized signal by the comparator 50 of the receiving device 40 is as shown in FIG. Further, a signal obtained by extracting a low frequency component from the synthesized signal by the low-pass filter 52 is as shown in FIG. Then, the rotation direction signal extracted by the comparator 53 from the low frequency component extracted by the low pass filter 52 is as shown in FIG.
[0056]
Further, as described above, the synthesized signal (that is, the current loop output from the current loop output conversion circuit 18) is compared with the threshold Th4 and the threshold Th3 as shown in FIG. It is also possible to extract the pulse separately.
[0057]
Besides the addition circuit 14 for synthesizing the temperature detection signal and the vibration detection signal being constituted by an analog circuit, an A / D conversion circuit for converting each of the temperature detection signal and the vibration detection signal into a digital signal, and this A / D conversion A digital circuit configuration including a microcomputer for processing the output of the circuit may be used. Similarly, the rotation direction detection circuit 16 and the addition circuit may be configured as a digital circuit.
[0058]
FIG. 18 is a block diagram showing the configuration of the rolling device operating condition detection device according to the second embodiment of the present invention.
In this figure, the rolling device operating condition detecting device of the present embodiment is a voltage output of the current loop output of the rolling device operating condition detecting device of the first embodiment. In this figure, the outputs of the addition circuits 14 and 17 are voltage outputs. By using the voltage output, one ground line 33 is required. However, the current loop output conversion circuits 15 and 18 are unnecessary in the sensor unit 10A, and the resistors 44 and 45 are unnecessary in the receiving device 40A. As a result, the cost can be reduced.
[0059]
The rolling device operating state detection device of the present invention can be applied not only to the bearing devices shown in the above embodiments, but also to linear motion devices such as the ball screw and linear guide shown in FIG. .
Further, the rolling bearing is not limited to a double row tapered roller bearing, but may be a short row bearing or a double row bearing such as a ball bearing, a cylindrical roller bearing and a spherical roller bearing.
[0060]
【The invention's effect】
  According to the rolling device operating state detection device of the invention according to claim 1,A rotation direction signal indicated by binary values of a high level and a low level is generated from two rotation speed signals having a phase difference other than 0 degrees and 180 degrees, and one of the low frequency rotation direction signal and the two rotation speed signals is generated. One rotation speed signal is added to generate and transmit one combined signal, and the transmission destination rotates by comparing it with a first reference value for extracting the rotation speed signal from the transmitted combined signal. After extracting the speed signal and further extracting the low frequency signal of the synthesized signal, the rotation direction signal is extracted by comparing the signal with the second reference value that converts the signal into binary of high level and low level. The circuit configuration can be simplified compared to the conventional technique in which the peak value of the detection signal and the width in the time axis direction are changed for each means, or a method in which each detection means is combined with unique identification information and a detection signal, Inexpensive rolling equipment It is possible to provide a status detection device.
[0063]
Further, since the synthesized signal is transmitted through the current loop, noise resistance can be improved as compared with the case where the synthesized signal is transmitted through the voltage output signal.
[0064]
  Claim2According to the rolling device operating state detection device of the invention, there is provided means for converting the synthesized signal into a current loop output by outputting a voltage instead of the current loop output, but requiring one extra ground line. It becomes unnecessary, and a resistor for forming a current loop becomes unnecessary at the transmission destination, so that the cost can be reduced when the distance to the transmission destination is not long.
[0065]
  Claim3According to the rolling device operating state detection device of the invention according to claim 1, the invention according to claim 1In addition to the effect of the above, the detection signals of a plurality of detection means are added using the difference in frequency to generate and transmit one composite signal, and the transmission destination passes only the frequency band of the output signal of each detection means. Since the output signal of each detection means is extracted using a filter, the peak value of the detection signal and the width in the time axis direction are changed for each detection means, or the identification information and detection signal unique to each detection means The circuit configuration can be simplified as compared with the prior art that employs a method of combining with the above, and it is possible to provide an inexpensive rolling device operating state detection device.
  Further, since the rotation speed signal and the rotation direction signal can be obtained at the same time in addition to the signals obtained from the first detection means and the second detection means, the operating condition of the rolling device can be grasped more accurately.
  Further, the number of electric wires can be reduced by using a common power line for the circuit that synthesizes and outputs the signals obtained from the first detection means and the second detection means and the circuit that synthesizes and outputs the rotation speed signal and the rotation direction signal. And cost reduction is possible.
[0066]
  Claim4According to the rolling device operating state detection device of the invention, there is provided means for converting the synthesized signal into a current loop output by outputting a voltage instead of the current loop output, but requiring one extra ground line. It becomes unnecessary, and a resistor for forming a current loop becomes unnecessary at the transmission destination, so that the cost can be reduced when the distance to the transmission destination is not long.
[0067]
  Claim5According to the rolling device operating state detection device of the invention, the temperature detection signal output from the temperature sensor is an analog signal having a small temporal change, and the vibration detection signal output from the vibration sensor is basically an AC component. Therefore, these signals can be easily separated at the transmission destination by using the difference in frequency.
[0068]
  Claim6According to the rolling device operating condition detection device of the invention, the rotation speed signal output from the rotation speed detection means is converted to an analog signal, so that electromagnetic induction that occurs at the time of steep rise or fall when a digital signal is output. Generation of noise can be suppressed. This is a signal that combines the temperature and vibration even if the signal line that sends the signal that combines the temperature and vibration and the signal line that sends the signal that combines the rotation speed signal and the rotation direction signal are sent by the same multi-core electric wire. Electromagnetic induction noise that falls is reduced.
[0069]
  Claim7According to the rolling device operating condition detecting device of the invention, it is possible to provide an inexpensive rolling device operating condition detecting device capable of detecting the operating condition of the rolling bearing device.
[0070]
  Claim8According to the rolling device operating state detecting device of the invention according to the invention, it is possible to provide an inexpensive rolling device operating state detecting device capable of detecting the operating state of the linear motion device.
[0071]
  Claim9Of the inventionAccording to the rolling device operating state detection device, the temperature detection signal output from the temperature sensor can be easily extracted by passing through a low-pass filter, and the vibration detection signal output from the vibration sensor can be easily passed through a high-pass filter. Can be extracted.
[0072]
  According to the rolling device operating state detection device of the invention of claim 10, it is possible to easily extract a low-frequency signal including a rotation direction signal through a low-pass filter.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a rolling device operating state detection device according to a first embodiment of the present invention.
FIG. 2 is a block diagram showing another example of the configuration of the rolling device operating state detection device according to the first exemplary embodiment of the present invention.
FIG. 3 is a waveform diagram showing a composite signal generation process in the rolling device operating condition detection device according to the first embodiment of the present invention.
FIG. 4 is a waveform diagram showing a rotation speed signal in the rolling device operating state detection device according to the first embodiment of the present invention.
FIG. 5 is a waveform diagram showing a rotation direction signal in the rolling device operating state detection device according to the first embodiment of the present invention.
FIG. 6 is a waveform diagram showing a composite signal in the rolling device operating condition detection device according to the first embodiment of the present invention.
FIG. 7 is a waveform diagram showing a temperature detection signal and a vibration detection signal extracted from the combined signal in the rolling device operating state detection device according to the first embodiment of the present invention.
FIG. 8 is a waveform diagram showing a rotation speed signal extracted from a combined signal in the rolling device operating condition detection device according to the first embodiment of the present invention.
FIG. 9 is a waveform diagram after the combined signal passes through the low-pass filter in the rolling device operating condition detection device according to the first embodiment of the present invention.
FIG. 10 is a waveform diagram showing a rotation direction signal extracted from a signal after passing through a low-pass filter of a synthesized signal in the rolling device operating condition detection device according to the first embodiment of the present invention.
FIG. 11 is a waveform diagram when the rotation speed sensor output in the rolling device operating state detection device according to the first exemplary embodiment of the present invention is an analog signal.
FIG. 12 is a waveform diagram when the rotation speed sensor output with a 90 ° phase shift is an analog signal in the rolling device operating state detection device according to the first exemplary embodiment of the present invention;
FIG. 13 is a waveform diagram showing a rotation direction signal generated from the rotation speed sensor output as an analog signal in the rolling device operating state detection device according to the first embodiment of the present invention.
FIG. 14 is a combined signal obtained by adding the rotation speed sensor output generated from the rotation speed sensor output as an analog signal to the rotation speed sensor output in the rolling device operating state detection apparatus according to the first embodiment of the present invention; FIG.
FIG. 15 is a combined signal obtained by adding the rotation speed sensor output generated from the rotation speed sensor output as an analog signal to the rotation speed sensor output in the rolling device operating state detection apparatus according to the first embodiment of the present invention; It is a wave form diagram which shows the rotational speed signal extracted from FIG.
FIG. 16 is a combined signal obtained by adding the rotation speed sensor output generated from the rotation speed sensor output as an analog signal to the rotation speed sensor output in the rolling device operating state detection apparatus according to the first embodiment of the present invention; It is a wave form diagram after passing through a low-pass filter.
FIG. 17 is a combined signal obtained by adding the rotation speed sensor output generated from the rotation speed sensor output as an analog signal to the rotation speed sensor output in the rolling device operating state detection apparatus according to the first embodiment of the present invention; It is a wave form diagram which shows the rotation direction signal extracted from the signal after passing through a low-pass filter.
FIG. 18 is a block diagram showing a configuration of a rolling device operating condition detection device according to a second embodiment of the present invention.
FIG. 19 is a diagram showing a case where the rolling device is a ball screw.
FIG. 20 is a diagram showing an example of attachment of a sensor unit of the rolling device operating state detection device.
FIG. 21 is a block diagram showing a configuration of a conventional rolling device operating condition detection device.
[Explanation of symbols]
10, 10A sensor unit
11 Temperature sensor
12 Vibration sensor
13-1, 13-2 Rotational speed sensor
14, 17 Adder circuit
15, 18 Current loop output conversion circuit
16 Rotation direction detection circuit
30, 31 signal line
32, 34 Power line
40, 40A receiver
41-43 input terminal
44, 45 resistance
46, 52 Low-pass filter
48 High-pass filter
50, 53 comparator
47, 49, 51, 54 Output terminal

Claims (10)

  A first rotational speed detecting means for detecting a rotational direction of a rotational shaft of the rolling device and outputting a rotational speed signal; and a first rotational speed detecting means for detecting the rotational direction of the rotational shaft and 0 degrees and 180 degrees. Second rotation speed detection means for outputting a rotation speed signal having a phase difference other than the rotation speed of the rotation shaft based on the phase difference between the rotation speed signals of the first rotation speed detection means and the second rotation speed detection means. Rotation direction detection means for detecting a direction and outputting the result as a rotation direction signal indicated by binary values of high level and low level, and either one of the first rotation speed detection means or the second rotation speed detection means An adding means for adding a rotation speed signal and a rotation direction signal of the rotation direction detecting means to combine them into one signal; a signal transmission means for sending the output signal of the addition means to a destination by transmission through a current loop; First comparison means for comparing with a first reference value for extracting the rotational speed signal from the combined signal sent by the signal transmission means, and the rotation direction signal from the synthesized signal sent by the signal transmission means. Signal extracting means for extracting a low-frequency signal including the second comparing means for comparing with a second reference value for converting the low-frequency signal extracted by the signal extracting means into a binary value of a high level and a low level; A rolling device operating state detection device comprising: The rolling device operating state detection device according to claim 1, wherein the signal transmission means outputs a voltage instead of a current loop output.   A first detection means for outputting a low-frequency signal; a second detection means for outputting a high-frequency signal; a low-frequency detection signal from the first detection means; and a high-frequency detection signal from the second detection means; Are added together to be combined into a single signal, a first signal transmission means for transmitting the combined signal from the first addition means to a destination by transmission through a current loop, and transmission by the first signal transmission means. First signal extraction means for extracting the detection signal of the first detection means from the synthesized signal thus obtained, and extraction of the detection signal of the second detection means from the synthesized signal sent by the first signal transmission means Second signal extracting means for detecting, a first rotational speed detecting means for detecting a rotational direction of the rotating shaft of the rolling device and outputting a rotational speed signal, and a first rotating speed by detecting the rotational direction of the rotating shaft. Detection means and 0 degrees and 180 degrees A second rotational speed detecting means for outputting a rotational speed signal having an external phase difference; and the rotation of the rotary shaft based on the phase difference between the rotational speed signals of the first rotational speed detecting means and the second rotational speed detecting means. Rotation direction detection means for detecting a direction and outputting the result as a rotation direction signal indicated by binary values of high level and low level, and either one of the first rotation speed detection means or the second rotation speed detection means A second adding means for adding the rotation speed signal and the rotation direction signal of the rotation direction detecting means to combine them into one signal; and a second addition means for sending the output signal of the second addition means to the transmission destination by transmission through a current loop. A signal transmission means, a first comparison means for comparing with a first reference value for extracting a rotation speed signal from the combined signal sent by the second signal transmission means, and a signal sent by the second signal transmission means. A signal extraction means for extracting a low-frequency signal including the rotation direction signal from the synthesized signal, and a second reference for converting the low-frequency signal extracted by the signal extraction means into a binary of high level and low level And a second comparison means for comparing with the value. 4. The rolling device operating state detection device according to claim 3 , wherein the first signal transmission unit or the second signal transmission unit outputs a voltage instead of a current loop output. 5. The first detection means is a temperature sensor, said second detection means, the rolling device operation status detecting apparatus according to 請 Motomeko 3 or claim 4 you being a vibration sensor. Wherein the first rotation speed detecting means and the second rotation speed detecting means, the rolling device operation status detecting apparatus according to any one of claims 5 respectively claim 1, characterized in that it outputs a rotation speed signal of the analog . The said rolling device is a rolling bearing device, The operating condition of this rolling bearing device is detected, The rolling device operating condition detection apparatus in any one of Claims 1-6 characterized by the above-mentioned. The said rolling device is a linear motion device, The driving | running state of this linear motion device is detected, The rolling device driving | running state detection apparatus in any one of Claims 1-6 characterized by the above-mentioned. 6. The rolling device operating condition detection device according to claim 5, wherein the first signal extraction means is a low-pass filter, and the second signal extraction means is a high-pass filter. 10. The rolling device operating state detection device according to claim 1, wherein the signal extraction means for extracting a low frequency signal including the rotation direction signal is a low pass filter.

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