CN103712566A - Diffuser blade pitch laser flying-spot detection device - Google Patents
Diffuser blade pitch laser flying-spot detection device Download PDFInfo
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- CN103712566A CN103712566A CN201210380195.8A CN201210380195A CN103712566A CN 103712566 A CN103712566 A CN 103712566A CN 201210380195 A CN201210380195 A CN 201210380195A CN 103712566 A CN103712566 A CN 103712566A
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Abstract
The invention discloses a diffuser blade pitch laser flying-spot detection device. By use of a laser detection head, the displacement data (X value) of the laser detection head along the axial direction (X direction) of a detected blade can be obtained, i.e., the dimension data of a detected blade pitch is measured. Through the uniform-speed continuous movement of the laser detection head, a corresponding series of X values can be obtained. In the same manner, the raster measuring signals in a Y direction can be obtained. Through receiving, amplification, conversion and corresponding synthesis of the two paths of signals, the profile dimension of the detected blade pitch is obtained, and the error correlation between the profile dimension of the detected blade pitch and a standard value can be reflected visually. By use of a rotary indexing device, the position of a diffuser blade on a circumference is successively changed, and then by repeating the detection method, a series of detection values of the blade pitch can be obtained.
Description
Technical field
The present invention relates to a kind of laser flying spot detection method of diffuser vane spacing, belong to technical field of nondestructive testing.
Background technology
Blade diffuser is the vitals of aeromotor, and the arrangement mode of blade and the positional precision of arranging have a significant impact the performance of diffuser, wherein to being positioned at face of cylinder blade axial spacing, particularly important referred to as the measurement of diffuser vane spacing.
External as the Reslink company of Norway, with CCD optical detection kerf spacing device.CCD detection method is limited to the pixel quantity (being generally 1024 * 1024) of CCD in measuring accuracy, is also subject to the impact of environmental baseline, and when lighting condition is poor and contrast is not enough, its measurement result is not satisfactory.In addition, special-purpose CCD pick-up unit is also more expensive; Domestic device and the product that diffuser vane spacing is carried out to non-contact detecting that there is no at present, many manufacturing firms are also carrying out contact type measurement with vernier caliper to diffuser vane spacing, and efficiency is low, low precision.
Summary of the invention
In order to overcome above-mentioned existing methodical deficiency, the invention provides a kind of laser flying spot detection method of diffuser vane spacing.
The technical scheme addressing the above problem is: a kind of laser flying spot detection method of diffuser vane spacing, and detection system is by rotary servovalve motor 1, dividing head 2, three-jaw self-centering chuck 3, tested blade 4, supplemental support 5, shift servo motor 6, speed reduction unit 7, grating scale 8, laser detection 9, mobile platform 10 forms, it is characterized in that: utilize laser detection 9, when laser is mapped to the entity part of tested blade 4, produce high level signal; When being mapped to the gap of tested blade 4, produce low level signal.Utilize the optical grating measuring system 8 of mobile platform 10, what while changing with high and low level in said process, produce develops into look-at-me, trigger the break in service process of one group of computer system, can record laser detection 9 displacement data along tested blade 4 axis directions (X-direction) (X value), that is record the dimensional data of tested blade 4 spacing.The movement that laser detection 9 is at the uniform velocity continuous, just can obtain corresponding a series of X value.In like manner, can obtain the grating measuring signal of Y-direction.Two paths of signals process receives, amplifies, changes and be correspondingly synthetic, thereby has obtained the profile size of tested blade 4 spacing, can reflect intuitively the profile size of tested blade 4 spacing and the error relationship of standard value.Utilize circular index device 1 successively to change the position of diffuser vane 4 on circumference, then repeat above detection method, can obtain the detected value of a series of blade pitchs.
Described laser detection 9 is arranged on mobile platform 10, and shift servo motor 6 drives mobile platforms 10 through speed reduction units 7, and the grating scale 8 that the change in location of mobile platform 10 is installed below by it is measured.
Described tested blade 4 one end are clamped in three-jaw self-centering chuck 3, and the other end is supported by supplemental support 5, are connected with three-jaw self-centering chuck 3, and the dividing head 2 being directly connected with rotary servovalve motor 1 drives tested blade 4 circular indexs.
The invention has the beneficial effects as follows, can high-level efficiency, detect diffuser vane spacing accurately.
Accompanying drawing explanation
Below in conjunction with accompanying drawing 1, accompanying drawing 2, accompanying drawing 3 and embodiment, the present invention is further described.
Accompanying drawing 1 is laser flying spot detection method principle schematic of the present invention.
Accompanying drawing 2 is tested blade 4 partial views.
Accompanying drawing 3 is blade pitch error analysis curves.
Embodiment
1. servomotors in figure, 2. dividing head, 3. three-jaw self-centering chuck, 4. tested blade, 5. supplemental support, 6. shift servo motor, 7. speed reduction unit, 8. grating scale, 9. laser detection head, 10. mobile platform
In Fig. 1, a kind of laser flying spot detection method of diffuser vane spacing, detection system is by rotary servovalve motor 1, dividing head 2, three-jaw self-centering chuck 3, tested blade 4, supplemental support 5, shift servo motor 6, speed reduction unit 7, grating scale 8, laser detection 9, mobile platform 10 forms, and it is characterized in that: utilize laser detection 9, when laser is mapped to the entity part of tested blade 4, produce high level signal; When being mapped to the gap of tested blade 4, produce low level signal.Utilize the optical grating measuring system 8 of mobile platform 10, what while changing with high and low level in said process, produce develops into look-at-me, trigger the break in service process of one group of computer system, can record laser detection 9 displacement data along tested blade 4 axis directions (X-direction) (X value), that is record the dimensional data of tested blade 4 spacing.The movement that laser detection 9 is at the uniform velocity continuous, just can obtain corresponding a series of X value.In like manner, can obtain the grating measuring signal of Y-direction.Two paths of signals process receives, amplifies, changes and be correspondingly synthetic, thereby has obtained the profile size of tested blade 4 spacing, can reflect intuitively the profile size of tested blade 4 spacing and the error relationship of standard value.Utilize circular index device 1 successively to change the position of diffuser vane 4 on circumference, then repeat above detection method, can obtain the detected value of a series of blade pitchs.
Described laser detection 9 is arranged on mobile platform 10, and shift servo motor 6 drives mobile platforms 10 through speed reduction units 7, and the grating scale 8 that the change in location of mobile platform 10 is installed below by it is measured.
Described tested blade 4 one end are clamped in three-jaw self-centering chuck 3, and the other end is supported by supplemental support 5, are connected with three-jaw self-centering chuck 3, and the dividing head 2 being directly connected with rotary servovalve motor 1 drives tested blade 4 circular indexs.
In accompanying drawing 2, can further know, laser detection moves along tested blade 4 axis directions 9 (comprising generating laser, receiver and photosignal shaping modulate circuit etc.) under the driving of servomotor, and measuring laser is penetrated by its transmitter.By adjusting the focal position of laser, make in A-B, C-D and E-F section, penetrate on tested blade 4 entities Laser Focusing; The photoelectric sensor that its folded light beam is integrated in laser detection 9 receives, and therefore produces high level signal.In B-C and D-E section, laser beam is penetrated just in the gap of tested blade 4, the photoelectric sensor being now integrated in laser detection 9 can not be received the folded light beam from tested blade 4, causes thus the output signal of its photoelectricity shaping modulate circuit to reduce to low level from high level.Utilize the grating scale 8 of mobile platform 10, with photoelectric sensing signal in said process, there is the look-at-me that develops into producing when high and low level changes, trigger the break in service process of one group of computer system, can record laser detection 9 displacement data along tested blade 4 axis directions (X-direction) (X value), that is record the dimensional data of tested blade 4 spacing.The movement that laser detection 9 is at the uniform velocity continuous, just can obtain corresponding a series of X value.
In accompanying drawing 3 blade pitch error analysis curves, horizontal ordinate represents gap frequency of occurrence between tested blade 4 each blades, and ordinate represents gap width, and curve 1 represents that nominal seam is wide, and curve 2 represents that actual seam is wide.This curve can reflect intuitively each blade pitch recording profile size and with the error relationship of standard value.
Claims (3)
1. the laser flying spot detection method of a diffuser vane spacing, detection system is by rotary servovalve motor (1), dividing head (2), three-jaw self-centering chuck (3), tested blade (4), supplemental support (5), shift servo motor (6), speed reduction unit (7), grating scale (8), laser detection head (9), mobile platform (10) forms, it is characterized in that: utilize laser detection head (9), when laser is mapped to the entity part of tested blade (4), produce high level signal; When being mapped to the gap of tested blade (4), produce low level signal.Utilize the optical grating measuring system (8) of mobile platform (10), what while changing with high and low level in said process, produce develops into look-at-me, trigger the break in service process of one group of computer system, can record laser detection head (9) along the displacement data (X value) of tested blade (4) axis direction (X-direction), that is record the dimensional data of tested blade (4) spacing.The at the uniform velocity continuous movement of laser detection head (9), just can obtain corresponding a series of X value.In like manner, can obtain the grating measuring signal of Y-direction.Two paths of signals process receives, amplifies, changes and be correspondingly synthetic, thereby has obtained the profile size of tested blade (4) spacing, can reflect intuitively the profile size of tested blade (4) spacing and the error relationship of standard value.Utilize circular index device (1) successively to change the position of diffuser vane (4) on circumference, then repeat above detection method, can obtain the detected value of a series of blade pitchs.
2. according to the laser flying spot detection method of the said diffuser vane spacing of claim 1, it is characterized in that: described laser detection head (9) is arranged on mobile platform (10), shift servo motor (6) drives mobile platform (10) through speed reduction unit (7), and the grating scale (8) that the change in location of mobile platform (10) is installed below by it is measured.
3. according to the laser flying spot detection method of the said diffuser vane spacing of claim 1, it is characterized in that: described tested blade (4) one end is clamped in three-jaw self-centering chuck (3), the other end is supported by supplemental support (5), be connected with three-jaw self-centering chuck (3), the dividing head (2) being directly connected with rotary servovalve motor (1) drives tested blade (4) circular index.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210380195.8A CN103712566A (en) | 2012-10-09 | 2012-10-09 | Diffuser blade pitch laser flying-spot detection device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210380195.8A CN103712566A (en) | 2012-10-09 | 2012-10-09 | Diffuser blade pitch laser flying-spot detection device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105526877A (en) * | 2014-10-23 | 2016-04-27 | 天津中杰科技发展有限公司 | Laser flying spot detector for blade spacing of diffuser |
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| JPH04250304A (en) * | 1991-01-28 | 1992-09-07 | Mitsubishi Heavy Ind Ltd | Shroud-clearance measuring device for turbine blade |
| CN101510454A (en) * | 2008-02-01 | 2009-08-19 | 伊利克塔股份有限公司 | Fluorescence vision system |
| DE102010060124A1 (en) * | 2009-10-27 | 2011-06-16 | Werth Messtechnik Gmbh | Method for determining position displacement between e.g. interferometric laser distance sensors in multi-sensor coordinate measuring device to determine work-piece structures, involves finding point so that distance of point is evaluated |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105526877A (en) * | 2014-10-23 | 2016-04-27 | 天津中杰科技发展有限公司 | Laser flying spot detector for blade spacing of diffuser |
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