CN209878123U - Testing device for fusion of rotating speed and key - Google Patents
Testing device for fusion of rotating speed and key Download PDFInfo
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- CN209878123U CN209878123U CN201920326498.9U CN201920326498U CN209878123U CN 209878123 U CN209878123 U CN 209878123U CN 201920326498 U CN201920326498 U CN 201920326498U CN 209878123 U CN209878123 U CN 209878123U
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Abstract
The utility model relates to a rotational speed and key fuse testing arrangement, including the toothed disc that tests the speed, eddy current sensor, fuse test system, the tooth top of any tooth that tests the speed in the toothed disc that tests the speed outwards extends a section or contracts a section inwards as the key looks mark, and install the toothed disc that tests the speed with key looks mark on the axle; an eddy current sensor is erected above the speed measuring gear disc with the key phase mark, and the eddy current sensor is connected with a fusion testing system. The utility model discloses a carry out simple transformation on the traditional gear that tests the speed, alright realize rotational speed and key looks integration test, need not to not only add the gear but also open key looks groove on same type equipment is epaxial, reduced the test technology transformation to being surveyed rotating machinery equipment. The utility model discloses a testing arrangement can compromise two kinds of test methods simultaneously, has both ensured the advantage of rotational speed test high accuracy, can realize the measurement of vibration phase place again, moves flat and provide the basis with follow-up vibration failure diagnosis analysis for the scene.
Description
Technical Field
The utility model relates to a rotating machinery equipment capability test device, especially a testing arrangement that rotational speed, key fuse mutually.
Background
The rotating speed is an important characteristic parameter for the performance test of the rotating mechanical equipment, and plays an important role in the industrial field because a plurality of characteristic parameters of the rotating mechanical equipment are closely related to the rotating speed. The measurement of the rotational speed of the device is therefore of great importance for the quality and efficiency of the rotating mechanical device. In order to ensure the reliability and precision of the rotating speed test, the commonly used rotating speed test method of the common rotating machinery equipment adopts a gear disc attached to a shaft and a non-contact induction gear of a magnetoelectric or eddy current sensor, and the sensor can induce the number of pulses of the gear with the corresponding number every time the shaft rotates one circle. The greater the number of teeth of the gear, i.e. the number of pulses generated per revolution of the sensor, the higher the measurement accuracy. If the most traditional counting method is adopted, namely a counter is used for counting the pulses, if N pulses are counted per second and the number of teeth is M, the rotating speed N is 60 × N/M and the unit r/min is obtained.
The key phase test is mainly used for extracting vibration phase information of rotating mechanical equipment and is commonly used for equipment dynamic balance analysis and equipment fault analysis and diagnosis. The principle is that a groove or a convex key is arranged on a measured shaft, and the groove or the convex key is called as a key phase mark. When the groove or the convex key rotates to the installation position of the probe, which is equivalent to the abrupt change of the distance between the probe and the measured surface, the sensor can generate a pulse signal, the pulse signal can be generated every time the shaft rotates for one circle, and the generated time indicates the position of the shaft in each rotation period. By comparing the pulses with the vibration signal of the shaft, the phase angle of the vibration can be determined. One pulse is generated by one rotation of the shaft, and if N key-phase slots are counted per second, the counting formula is that the rotation speed N is 60 × N and the unit r/min.
If key phase and rotation speed tests are simultaneously considered in one test or online monitoring system, the following defects respectively exist:
(1) if the key-slot scheme is adopted alone, the vibration phase can be measured, but the measurement precision of the rotating speed is relatively poor, and the updating of the rotating speed is relatively slow, especially for the situation that the rotating speed is low, if the rotating speed of one device is n and the unit r/min, if the system requires the updating period of the rotating speed to be 2S, the error is 1/(2 (n/60)) if the system requires the updating period of the rotating speed to be 2S, the counting error is 1/(2M (n/60)) if the rotating speed is measured by selecting the gear disc with M teeth, the counting error is 1/(2M (n/60)), and it can be seen that the precision of the gear disc adopted is always M times, if the rotating speed of the device is 3000, the error is 1 percent, namely +/-30 r/min, and if the gear disc with 60 teeth is adopted, the error is 0.0167 percent, and the error is +/-0.5 r/.
(2) If the gear disc scheme is adopted independently, the rotating speed precision can be improved greatly, the only initial zero point on the shaft cannot be identified because the shaft rotates for one circle and has N teeth, and therefore, the vibration phase cannot be obtained.
(3) If two modes are adopted in one set of monitoring system, the key phase and rotating speed problems can be solved, but the following defects exist:
a. a rotating speed gear and a key opening phase groove are required to be arranged on a shaft at the same time; b. two paths of sensors are required to be erected for rotating speed measurement and key phase measurement respectively, and two paths of cables are arranged at the same time; c. two testing systems are required to be added in a back-end monitoring system, one testing system is used for measuring the rotating speed, and the other testing system is used for measuring the key phase.
Disclosure of Invention
The utility model aims to provide a rotational speed fuses testing arrangement mutually with key for the solution satisfies rotational speed and key and can compromise the technical problem of measurement simultaneously at same test or state monitoring system.
In order to achieve the above purpose, the technical scheme of the utility model is as follows:
a testing device for the fusion of a rotating speed and a key comprises a speed measuring gear disc, an eddy current sensor and a fusion testing system, wherein the tooth tops of any speed measuring teeth in the speed measuring gear disc extend outwards for a section or contract inwards for a section to serve as a key phase mark, and the speed measuring gear disc with the key phase mark is arranged on a shaft; an eddy current sensor is erected above the speed measuring gear disc with the key phase mark, and the eddy current sensor is connected with a fusion testing system.
Further, the tooth top of the speed measuring tooth extends outwards for a certain distance of 1mm, and contracts inwards for a certain distance of 1 mm.
Furthermore, the fusion test system comprises a sensor power supply circuit, a signal conditioning circuit, a high-speed ADC, a CPU chip and a fusion test module; the sensor power supply circuit is connected with the eddy current sensor and supplies power to the eddy current sensor, and the eddy current sensor is sequentially connected with the signal conditioning circuit, the high-speed ADC, the CPU chip and the fusion test module; the eddy current sensor outputs corresponding signals to the signal conditioning circuit, the signals enter the high-speed ADC after the signals are processed by the signal conditioning circuit, the signals in the high-speed ADC are converted into digital signals through analog-to-digital conversion, pulse waveforms are output, and the digital signals enter the rear-end CPU chip; the CPU chip compares the obtained gear + key phase pulse waveforms through the fusion testing module, separates out gear pulses and key phase pulse waveforms respectively, and sends the obtained rotating speed and key phase pulse waveforms to the rotating speed calculating module and the key phase measuring module of the fusion testing module respectively for calculation processing to obtain fusion testing data.
The utility model has the advantages that:
1. according to the utility model discloses, as before, to carrying out simple transformation in the design of traditional speed measurement gear, alright realize rotational speed and key looks integration test, need not to not only add the gear on same type equipment axle but also open key looks groove, reduced the test technology transformation to being surveyed rotating machinery equipment.
2. According to the utility model, the rear-end monitoring system only needs to provide one sensor and one cable, and only needs to install one sensor in the equipment according to the hole or additionally install one installation tool, thus reducing the cost and the installation and process difficulty compared with the traditional method;
3. according to the utility model discloses, follow-up processing system only needs to occupy a hardware processing passageway alright realize the synchronous measurement of two kinds of signals, and traditional mode reduces circuit complexity and hardware cost relatively.
4. According to the utility model discloses, two kinds of test methods can compromise simultaneously, have both ensured the advantage of rotational speed test high accuracy, can realize the measurement of vibration phase place again, move flat and provide the basis with follow-up vibration failure diagnosis analysis for the scene.
Drawings
FIG. 1 is a schematic view of a device for testing the integration of rotational speed and key according to the present invention;
wherein: a. low teeth, b. high teeth;
FIG. 2 is a schematic structural diagram of the fusion test system of the present invention;
FIG. 3 is a waveform of two gear output pulses;
wherein: a. low-tooth waveform, b. high-tooth waveform;
FIG. 4 is a diagram of a low tooth output pulse waveform processing;
wherein: a to e are low-tooth output different pulse waveforms;
FIG. 5 is a diagram of a high tooth output pulse waveform processing;
wherein: a to c are different pulse waveforms output by high teeth.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings and examples.
As shown in fig. 1 and 2, the testing device for the combination of the rotating speed and the key comprises a speed measuring gear disc, an eddy current sensor 3, a combination testing system and the like.
(1) As shown in fig. 1, on the basis of a conventional speed measuring gear disc, one of the speed measuring gears of the speed measuring gear disc is increased by T1 mm to form a high gear 2 (see fig. 1b) or decreased by S1 mm to form a low gear 1 (see fig. 1a) as a key phase mark (the increase or decrease value can be determined according to the unit requirement and the sensor range, where 1mm is only a recommended value), and the speed measuring gear disc with the key phase mark is mounted on a shaft in a conventional manner;
(2) erecting an eddy current sensor 3 above a speed measuring gear disc for non-contact measurement of the rotating speed and key phase marks of the gear;
(3) the utility model relates to a fuse the test system structure as shown in figure 2, should fuse the test system and include sensor power supply circuit 4, signal conditioning circuit 5, high-speed ADC 6, CPU chip 7, fuse the test module; the sensor power supply circuit 4 supplies power to the eddy current sensor, then the eddy current sensor outputs a corresponding signal to the signal conditioning circuit 5, the signal conditioning circuit 5 performs certain processing on an original analog signal output by the sensor and then enters the high-speed ADC 6, the signal in the high-speed ADC 6 is converted into a digital signal through analog-to-digital conversion, a pulse waveform as shown in figure 3 is obtained, and the digital signal enters the rear-end CPU chip 7;
(4) through the utility model relates to a fuse test module, including rotational speed measurement module and key phase measurement module, will obtain gear + key phase pulse waveform, if the gear is low profile of tooth form, its waveform is as shown in fig. 3a, and its normal tooth voltage is V1, and low tooth voltage is V2, then does following processing V with the voltage value that obtainsi’＝-Vi+V0(V0 > V1), the waveform of FIG. 4c is obtained, the processed normal tooth voltage is V1 ', the low tooth voltage is V2', the waveforms are passed through 2 comparators, one comparator voltage Vx>0 and Vx is less than V1', the rotation speed waveform can be separated as shown in FIG. 4d, a comparison voltage Vy>V1 'and Vx is less than V2', the separable key phase waveform is shown in FIG. 4 e;
(5) if the gear is in a high tooth form, the waveform of which is shown in fig. 3b, the normal tooth voltage is V1, the high tooth voltage is V3, the normal tooth voltage is V1 and the high tooth voltage is V3, the above waveforms are respectively passed through 2 comparators, one comparison voltage Vx >0 and Vx less than V1, the rotation speed waveform can be separated as shown in fig. 5b, and one comparison voltage Vy > V1 and Vx less than V3, the key phase waveform can be separated as shown in fig. 5 c;
(6) the rotating speed and the key phase pulse waveform obtained by the figure 2 are respectively sent to the rotating speed measuring module 9 and the key phase measuring module 8 to be respectively calculated, so that the purpose of the utility model can be achieved.
Claims (3)
1. The utility model provides a rotational speed fuses testing arrangement with key mutually, includes gear disc, eddy current sensor, fuses test system that tests the speed, its characterized in that: the tooth top of any one of the speed measuring teeth in the speed measuring gear disc extends outwards for a section or contracts inwards for a section to serve as a key phase mark, and the speed measuring gear disc with the key phase mark is arranged on the shaft; an eddy current sensor is erected above the speed measuring gear disc with the key phase mark, and the eddy current sensor is connected with a fusion testing system.
2. The rotational speed and key fusion testing device according to claim 1, wherein: the tooth top of the speed measuring tooth extends outwards for a certain distance of 1mm, and contracts inwards for a certain distance of 1 mm.
3. The rotational speed and key fusion testing device according to claim 1, wherein: the fusion test system comprises a sensor power supply circuit, a signal conditioning circuit, a high-speed ADC, a CPU chip and a fusion test module; the sensor power supply circuit is connected with the eddy current sensor and supplies power to the eddy current sensor, and the eddy current sensor is sequentially connected with the signal conditioning circuit, the high-speed ADC, the CPU chip and the fusion test module; the eddy current sensor outputs corresponding signals to the signal conditioning circuit, the signals enter the high-speed ADC after the signals are processed by the signal conditioning circuit, the signals in the high-speed ADC are converted into digital signals through analog-to-digital conversion, pulse waveforms are output, and the digital signals enter the rear-end CPU chip; the CPU chip compares the obtained gear + key phase pulse waveforms through the fusion testing module, separates out gear pulses and key phase pulse waveforms respectively, and sends the obtained rotating speed and key phase pulse waveforms to the rotating speed calculating module and the key phase measuring module of the fusion testing module respectively for calculation processing to obtain fusion testing data.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920326498.9U CN209878123U (en) | 2019-03-14 | 2019-03-14 | Testing device for fusion of rotating speed and key |
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| CN201920326498.9U CN209878123U (en) | 2019-03-14 | 2019-03-14 | Testing device for fusion of rotating speed and key |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109900350A (en) * | 2019-03-14 | 2019-06-18 | 中国船舶重工集团公司第七0四研究所 | Revolving speed and key blend test device and its method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109900350A (en) * | 2019-03-14 | 2019-06-18 | 中国船舶重工集团公司第七0四研究所 | Revolving speed and key blend test device and its method |
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