CN102288407A - Torsional vibration testing device - Google Patents
Torsional vibration testing device Download PDFInfo
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- CN102288407A CN102288407A CN2011102138417A CN201110213841A CN102288407A CN 102288407 A CN102288407 A CN 102288407A CN 2011102138417 A CN2011102138417 A CN 2011102138417A CN 201110213841 A CN201110213841 A CN 201110213841A CN 102288407 A CN102288407 A CN 102288407A
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- torsional oscillation
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Abstract
The invention discloses a torsional vibration testing device. The torsional vibration testing device comprises a connecting piece, a toothed signal reflection device and a signal transmitting and receiving device, wherein the connecting piece is fixedly connected with a tested part; the toothed signal reflection device is fixedly connected with the connecting piece; the signal transmitting and receiving device is supported by a bracket; the peripheral part of the toothed signal reflection device is arranged opposite to the signal transmitting and receiving device; and the signal transmitting and receiving device is a photoelectric sensor. A pulse signal of the torsional vibration testing device disclosed by the invention is influenced a little by the external environment, so the rotating speed fluctuation quantity of the tested piece can be detected accurately.
Description
Technical field
The present invention relates to technical field of measurement and test, particularly relate to a kind of torsional oscillation proving installation.
Background technology
In the course of the work, rotatablely move because the bent axle of engine need change the to-and-fro movement of piston into, and transmission of power is gone out, drive connected slave unit motion.
In said process, bent axle need bear torsional fatigue load, in order to understand the antitorque commentaries on classics performance of bent axle, prevents that the torsion angle of bent axle is excessive, and general using torsional oscillation proving installation is tested bent axle.
Please refer to Fig. 1, Fig. 1 is a kind of structural representation that typically reverses proving installation in the prior art.
As shown in FIG., the proving installation that reverses of the prior art comprises mounting flange 11, one side of mounting flange 11 is set with connecting link 12, be set with sensor stand 13 and fluted disc 15 on the connecting link 12 successively, be provided with bearing 14 between sensor stand 13 and the connecting link 12, wherein sensor stand 13 is fixed with the outer ring of bearing 14, connecting link 12 is fixed with the inner ring of bearing 14, fluted disc 15 is under the effect of the installation nut 16 of the end of connecting link 12, compress the inner ring of bearing 14, rotate with the inner ring of mounting flange 11, connecting link 12, bearing 14; Be fixed with electromagnetic type speed probe 17 on the sensor stand 13, echo mutually with each tooth of fluted disc 15.
In the course of work, at first the bent axle of tested engine is fixedlyed connected with mounting flange 11, starting engine, the bent axle that makes engine is according to certain rotating speed rotation, in the rotary course, the inner ring of mounting flange 11, connecting link 12, bearing 14, fluted disc 15 and nut 16 is installed is rotated with bent axle.
Please refer to Fig. 2 and Fig. 3, the view when Fig. 2 is in first kind of state for electromagnetic type speed probe in the prior art and fluted disc; View when Fig. 3 is in second kind of state for structure shown in Figure 2.
In the testing process, when fluted disc 15 turns over electromagnetic type speed probe 17, the magnetic flux of the coil in the electromagnetic type speed probe 17 can change, set up the voltage of inducing of a frequency and the proportional variation of magnetic flux at the coil two ends, obtain pulse signal, thereby can judge whether the rotating speed of engine crankshaft remains stable by the time interval between the two adjacent pulse signals, and can obtain the undulate quantity of speed of crankshaft according to the amplitude of time interval amount.
Yet, because the ultimate principle of detection of the prior art is the variation formation voltage signal by the magnetic flux in the coil, and then acquisition pulse signal, and the variable quantity of magnetic flux is easy to be subjected to the interference of electromagnetic field, make the pulse signal that collects which amplitude modulation occur, thereby there is error in the pulse that causes fluted disc to form, even the phenomenon that pulse signal is lost occurs, the result that influence detects.
Therefore, how to reduce the influence of external environment pulse signals, improve the accuracy that detects, just become the present technical issues that need to address of those skilled in the art.
Summary of the invention
The purpose of this invention is to provide a kind of torsional oscillation proving installation, the pulse signal of this torsional oscillation proving installation is subjected to the influence of external environment less, can detect the fluctuation of speed amount of detected member more exactly.
For solving the problems of the technologies described above, the invention provides a kind of torsional oscillation proving installation, comprise the web member of fixedlying connected, the dentation signal reflex device of fixedlying connected and the signal transceiver by stent support with described web member with unit under test, the peripheral part of described dentation signal reflex device and described signal transceiver are oppositely arranged, and described signal transceiver is a photoelectric sensor.
Preferably, described dentation signal reflex device is a fluted disc.
Preferably, the gear teeth number of described fluted disc is 120.
Preferably, described web member is a joint flange.
Preferably, the side that described joint flange is relative with described unit under test is fixed with connecting link, and described dentation signal reflex device is set in described connecting link.
Preferably, described support casing is loaded on described connecting link, is provided with bearing between the connecting hole of described connecting link and described support.
Preferably, described bearing is a rolling bearing, and the inner ring of described rolling bearing is fixedlyed connected with described connecting link, fixedlys connected with described support in its outer ring.
Torsional oscillation proving installation provided by the present invention, comprise the web member of fixedlying connected, the dentation signal reflex device of fixedlying connected and the signal transceiver by stent support with web member with unit under test, the peripheral part and the signal transceiver of dentation signal reflex device are oppositely arranged, wherein, the signal transceiver is specially photoelectric sensor.In the test process, at first unit under test (in most cases being the bent axle of engine) is connected with web member, make unit under test enter duty then, the dentation signal reflex device rotation that drives web member and fixedly connected with it, and the signal transceiver constantly sends signal to dentation signal reflex device, and receive by its signal that reflects, the signal that photoelectric sensor sent is a light signal, reflection through dentation signal reflex device, received by the phototransistor of photoelectric sensor, AC amplifier through photoelectric sensor is amplified to suitable level then, carry out detection and integration again, convert thereof into d. c. voltage signal, after wave shaping, itself and the DC voltage of setting are compared, the dc voltage value that is higher than setting is output as high level, the dc voltage value that is lower than setting is output as low level, the voltage pulse signal that obtains exporting, and the signal through reflecting near the tooth top position of dentation signal reflex device, semaphore is more by force a high level signal, through the signal that reflects near the tooth root position of dentation signal reflex device, semaphore is more weak to be low level signal, just can be according to the output time interval of signal, again according to the angle on two adjacent teeth top, draw the rotating speed of bent axle, and then draw the undulate quantity of speed of crankshaft within a certain period of time, reach the purpose that detects torsional oscillation.As can be seen, torsional oscillation pick-up unit provided by the present invention utilizes photoelectric sensor to send and receiving optical signals, and the frequency of light source is through ovennodulation, strong interference immunity, greatly reduces the interference of external environment, and have higher precision, guaranteed the accuracy that detects.
Description of drawings
Fig. 1 is a kind of structural representation that typically reverses proving installation in the prior art;
View when Fig. 2 is in first kind of state for electromagnetic type speed probe in the prior art and fluted disc;
View when Fig. 3 is in second kind of state for structure shown in Figure 2;
The structural representation that reverses proving installation that Fig. 4 is provided for a kind of embodiment of the present invention.
Embodiment
Core of the present invention provides a kind of torsional oscillation proving installation, and the pulse signal of this torsional oscillation proving installation is subjected to the influence of external environment less, can detect the fluctuation of speed amount of detected member more exactly.
In order to make those skilled in the art person understand the present invention program better, the present invention is described in further detail below in conjunction with the drawings and specific embodiments.
Please refer to Fig. 4, the structural representation that reverses proving installation that Fig. 4 is provided for a kind of embodiment of the present invention.
In the course of the work, engine is to promote piston by fuel at combustor inner cylinder to move reciprocatingly, and then drive crankshaft rotating, with power transmission to each parts, yet in the to-and-fro movement process of piston, the speed of its motion is constantly to change, thereby the twisting action power that bent axle bore also is constantly to change, variation of force will inevitably cause the variation and the generation of vibration of bent axle movement velocity, the present invention for accurately understand bent axle in the course of the work movement velocity variable quantity and be provided with.
As shown in Figure 4, in a kind of embodiment, torsional oscillation proving installation provided by the present invention comprises web member 21, dentation signal reflex device 25 and signal transceiver 27; Web member 21 is fixedlyed connected with unit under test (being mainly the bent axle of engine), dentation signal reflex device 25 is fixedlyed connected with web member 21, signal transceiver 27 supports by support 22, and be arranged at the corresponding position of peripheral part with dentation signal reflex device 25, wherein, signal transceiver 27 is specially photoelectric sensor.
Dentation signal reflex device 25 is along with web member 21 and unit under test move together, if it is constant that the rotational speed of unit under test keeps, it is identical then turning over the needed time of identical angle, perhaps turning over the needed time of two different angles is identical with ratio between two angles, according to above-mentioned principle, the amplitude of the rotating speed that the unit under test that can survey moves under certain condition, and judge whether above-mentioned amplitude drops in the certain limit.
Thereby in test process, at first unit under test (in most cases being the bent axle of engine) is connected with web member 21, make unit under test enter duty then, dentation signal reflex device 25 rotations that drive web member 21 and fixedly connected with it, and signal transceiver 27 constantly sends signal to dentation signal reflex device 25, and receive by its signal that reflects, the signal that photoelectric sensor sent is a light signal, reflection through dentation signal reflex device 25, received by the phototransistor of photoelectric sensor, AC amplifier through photoelectric sensor is amplified to suitable level then, carry out detection and integration again, convert thereof into d. c. voltage signal, after wave shaping, itself and the DC voltage of setting are compared, the dc voltage value that is higher than setting is output as high level, the dc voltage value that is lower than setting is output as low level, the voltage pulse signal that obtains exporting, and the signal through reflecting near the tooth top position of dentation signal reflex device, semaphore is more by force a high level signal, through the signal that reflects near the tooth root position of dentation signal reflex device, semaphore is more weak to be low level signal, just can be according to the output time interval of signal, again according to the angle on two adjacent teeth top, draw the rotating speed of bent axle, and then draw the undulate quantity of speed of crankshaft within a certain period of time, reach the purpose that detects torsional oscillation.
As can be seen, torsional oscillation pick-up unit provided by the present invention utilizes photoelectric sensor to send and receiving optical signals, and the frequency of light source is through ovennodulation, strong interference immunity, greatly reduces the interference of external environment, and have higher precision, guaranteed the accuracy that detects.
Particularly, as shown in FIG., dentation signal reflex device 25 can be fluted disc, fluted disc can be connected with web member 25 easily, and existing parts directly can be brought use, has reduced the cost of pick-up unit, further, angle on the fluted disc between adjacent two teeth equates, therefore only need also can obtain the amplitude of rotating speed easily by can obtain the rotation speed relation of unit under test according to the time relationship of signal.
Certainly, dentation signal reflex device 25 also can be for other install, such as: at the side of web member 21 or the fixing a plurality of isolated gear teeth of peripheral part etc., as long as can realize that measuring ability all is fine.
For the accuracy that guarantees to detect, reduce accuracy requirement simultaneously to the fluted disc structure, the gear teeth number of fluted disc can be 120.
Web member 21 is to be used for being connected with unit under test, in order to reduce the complexity of connection, guarantee the reliability of connection simultaneously, web member 21 is specifically as follows joint flange, thereby in connection procedure, only the connecting thread hole centering of bent axle and joint flange need be got final product with the coupling bolt connection then.
On the other hand, for convenience the setting of each parts can be provided with a connecting link 22, and connecting link 22 and unit under test lay respectively at the both sides of joint flange, and dentation signal reflex device 25 is fixedlyed connected with joint flange by being set in connecting link 22.
For making things convenient for the setting of photoelectric sensor, guarantee the relative position of photoelectric sensor and dentation signal reflex device 25 simultaneously, support 23 can be set in connecting link 22, and in order to prevent that support 23 with connecting link 22 motions, is provided with bearing 24 between the connecting hole of connecting link 22 and support 23.
Above-mentioned bearing 24 is specifically as follows rolling bearing, and the inner ring of rolling bearing fixedlys connected with connecting link, fixedlys connected with support in its outer ring.
In when assembling, at first bearing 24 is set in connecting link 22, then support 23 is set in bearing 24, again fluted disc 25 is set in connecting link 22, finally utilize set nut 26 to be connected with the thread segment of connecting link end, compress and get final product.
More than torsional oscillation proving installation provided by the present invention is described in detail.Used specific case herein principle of the present invention and embodiment are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof.Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of claim of the present invention.
Claims (7)
1. torsional oscillation proving installation, comprise the web member of fixedlying connected, the dentation signal reflex device of fixedlying connected and the signal transceiver by stent support with described web member with unit under test, the peripheral part of described dentation signal reflex device and described signal transceiver are oppositely arranged, it is characterized in that described signal transceiver is a photoelectric sensor.
2. torsional oscillation proving installation according to claim 1 is characterized in that, described dentation signal reflex device is a fluted disc.
3. torsional oscillation proving installation according to claim 2 is characterized in that, the gear teeth number of described fluted disc is 120.
4. torsional oscillation proving installation according to claim 2 is characterized in that, described web member is a joint flange.
5. torsional oscillation proving installation according to claim 4 is characterized in that, the side that described joint flange is relative with described unit under test is fixed with connecting link, and described dentation signal reflex device is set in described connecting link.
6. torsional oscillation proving installation according to claim 5 is characterized in that described support casing is loaded on described connecting link, is provided with bearing between the connecting hole of described connecting link and described support.
7. torsional oscillation proving installation according to claim 6 is characterized in that, described bearing is a rolling bearing, and the inner ring of described rolling bearing is fixedlyed connected with described connecting link, fixedlys connected with described support in its outer ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102138417A CN102288407A (en) | 2011-07-28 | 2011-07-28 | Torsional vibration testing device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011102138417A CN102288407A (en) | 2011-07-28 | 2011-07-28 | Torsional vibration testing device |
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| CN102288407A true CN102288407A (en) | 2011-12-21 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102981016A (en) * | 2012-12-14 | 2013-03-20 | 上海出入境检验检疫局机电产品检测技术中心 | Processing system and method for detecting rotating speed of rotating object |
| TWI481842B (en) * | 2013-05-29 | 2015-04-21 | Wistron Corp | Apparatus and methods for testing guiding wheel |
| CN106768271A (en) * | 2016-12-06 | 2017-05-31 | 武汉理工大学 | Torsional vibration pick-up and twisting vibration measuring method based on fiber grating |
| CN110470863A (en) * | 2019-09-03 | 2019-11-19 | 中国空气动力研究与发展中心超高速空气动力研究所 | A kind of speed measuring device calibration system and scaling method |
| CN110579352A (en) * | 2019-10-15 | 2019-12-17 | 西安交通大学 | Torsional vibration testing device |
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| US4008600A (en) * | 1975-10-15 | 1977-02-22 | Wallace-Murray Corporation | Torsional vibration damper measuring |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102981016A (en) * | 2012-12-14 | 2013-03-20 | 上海出入境检验检疫局机电产品检测技术中心 | Processing system and method for detecting rotating speed of rotating object |
| TWI481842B (en) * | 2013-05-29 | 2015-04-21 | Wistron Corp | Apparatus and methods for testing guiding wheel |
| CN106768271A (en) * | 2016-12-06 | 2017-05-31 | 武汉理工大学 | Torsional vibration pick-up and twisting vibration measuring method based on fiber grating |
| CN106768271B (en) * | 2016-12-06 | 2019-06-25 | 武汉理工大学 | Torsional vibration pick-up and twisting vibration measurement method based on fiber grating |
| CN110470863A (en) * | 2019-09-03 | 2019-11-19 | 中国空气动力研究与发展中心超高速空气动力研究所 | A kind of speed measuring device calibration system and scaling method |
| CN110470863B (en) * | 2019-09-03 | 2021-05-25 | 中国空气动力研究与发展中心超高速空气动力研究所 | Speed measuring device calibration system and calibration method |
| CN110579352A (en) * | 2019-10-15 | 2019-12-17 | 西安交通大学 | Torsional vibration testing device |
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Application publication date: 20111221 |