CN104764541A - Production device and method for microspur distributed type optical fiber temperature measuring sensor - Google Patents
Production device and method for microspur distributed type optical fiber temperature measuring sensor Download PDFInfo
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- CN104764541A CN104764541A CN201510170655.8A CN201510170655A CN104764541A CN 104764541 A CN104764541 A CN 104764541A CN 201510170655 A CN201510170655 A CN 201510170655A CN 104764541 A CN104764541 A CN 104764541A
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- optical fiber
- stepper motor
- microspur
- lead screw
- support
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 58
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title abstract description 5
- 239000000835 fiber Substances 0.000 claims description 30
- 238000009529 body temperature measurement Methods 0.000 claims description 26
- 229910000838 Al alloy Inorganic materials 0.000 claims description 11
- 238000001125 extrusion Methods 0.000 claims description 7
- 238000004804 winding Methods 0.000 claims description 7
- 230000003287 optical effect Effects 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 230000001788 irregular Effects 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 241000239290 Araneae Species 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 239000000523 sample Substances 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 8
- 238000001816 cooling Methods 0.000 abstract description 3
- 238000007380 fibre production Methods 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000001069 Raman spectroscopy Methods 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000001902 propagating effect Effects 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N ferric oxide Chemical compound O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 230000003319 supportive effect Effects 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
Landscapes
- Radiation Pyrometers (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The invention discloses a production device and method for a microspur distributed type optical fiber temperature measuring sensor and belongs to the range of optical fiber production devices. The production device for the microspur distributed type optical fiber temperature measuring sensor is mainly formed by a support, a rotating shaft, a guide rail lead screw, two stepping motors and an optical fiber disc. The rotating shaft and the first stepping motor are installed on the upper layer of the support, a lead screw guide rail and the second stepping motor are fixed to a lower layer base, the optical fiber disc and a sliding block are fixed together through a fixing support, and the optical fiber disc carries out the uniform linear motion along the guide rail lead screw along with the sliding block. The microspur distributed type optical fiber temperature measuring sensor is produced in the mode that a mandrel is driven to rotate by the first stepping motor, the optical fiber disc is made to move horizontally through the second stepping motor at the same time, and thus an optical fiber can be wound on the mandrel. The optical fiber serves as a medium for detecting and transmitting temperature signals, a distributed continuous optical fiber temperature sensing technology is achieved, and the spatial resolution can be increased by 400 times. The production device and method for the microspur distributed type optical fiber temperature measuring sensor are used for pouring large-size concrete projects, the temperature gradient distribution in the direction perpendicular to cooling pipes can be comprehensively reflected, and the temperature measuring precision is high.
Description
Technical field
The invention belongs to optical fiber producing apparatus scope, particularly a kind of production equipment of microspur distributed optical fiber temperature measurement sensor and production method.
Background technology
Hydraulic engineering often must build mass concrete, and internal water heat-transmission is difficult to distribute, and causes temperature to raise.Conventional cooling water pipe, relies on water snakelike movement in pipe, realizes concrete cooling.There is temperature drop field near cooling water pipe, apart from water pipe, temperature is low nearby, and temperature is high at a distance.The speed of water flowing speed, determine the size of temperature drop field gradient, too conference causes concrete to occur crack, and too little meeting lowers efficiency, and does not reach the requirement of cooling.
Prior art cannot realize the measurement of vertical water pipe direction thermograde.Common temperature sensor, its conductor leading can fail temperature field.The measuring distance of Bragg grating only has tens centimeters, and measuring point is less than ten, and series connection uses, and the spacing of adjacent two Bragg gratings is restricted.Distributed optical fiber temperature measurement, the time interval that electronic component converts electric signal to reduces spatial accuracy, and one meter is only had a measuring point, cannot reflect the change of thermograde.
The present invention is based on distributed optical fiber temperature measurement technology, by technique improvement, improve spatial resolution.Distributed optical fiber temperature measurement technology take optical fiber as detection and the media propagating temperature signal, is a kind of distributed, continuous print, functional fiber temperature sensor technology.Laser pulse is propagated in a fiber, with optical fiber interaction of molecules, the scattering of various ways occurs.Utilize Raman scattering, luminous energy is converted into thermal vibration, will send the light than optical source wavelength length; Thermal vibration is converted into luminous energy, will send a light shorter than optical source wavelength.The skew of wavelength is determined by the fixed attribute of optical fiber component, and therefore the intensity of Raman diffused light is relevant with temperature, utilizes this this relation, realizes optical fiber temperature-measurement.It can not fail temperature field, measures length unrestricted, can survey the temperature in tens kilometer range.Shortcoming is that space distribution rate is low, and one meter can only obtain a temperature spot.
This is studied in a distributed manner based on Fiber Optic Pyrometer, develops neither fail temperature field, can measure again intensive temperature spot, spatial resolution can be brought up to two millimeters and obtain a temperature spot, range resolution is improved more than 400 times.
Summary of the invention
The object of this invention is to provide a kind of production equipment and production method of microspur distributed optical fiber temperature measurement sensor, it is characterized in that, the production equipment of microspur distributed optical fiber temperature measurement sensor is formed primarily of support, rotation axis, lead screw guide rails, two stepper motors and light pricker dish;
Described support is made up of two-layer up and down, and wherein, upper strata is rotating part, and four root posts of support 5 are fixed on two horizontal pillows 8, and the horizontal pillow of every bar is supported by the bottom support bracket 9 of two; The one end of installing rotation axis 3 rotation axis 3 at the rectangular frame center of support 5 is connected by shaft joint and the first stepper motor 1, and the other end of rotation axis 3 is fixed on the rectangular frame of support 5 by bearing spider; Lower floor is translation part, and firm banking 15 in the middle part of two horizontal pillows 9, base 15 is fixed lead screw guide rails 11, fixes the second stepper motor 2 at the left end of base 15; One end of lead screw guide rails 11 is connected by shaft joint and the second stepper motor 2, on the other end spring bearing support plate 8 of lead screw guide rails 11; Slide block 13 is embedded in lead screw guide rails 11 by screw thread, and drives lead screw guide rails 11 at the uniform velocity to sway by the second stepper motor 2, and slide block 13 does linear uniform motion along lead screw guide rails 11;
Described smooth pricker dish for fix block plate 14 around light pricker axle 6 two ends, and is supported on light pricker dish support column 7, and light pricker dish support column 7 is fixed on light pricker and tries to get to the heart of a matter on plate 12; Try to get to the heart of a matter plate 12 of light pricker is formed with slide block 13 is fixing; Then light pricker dish does linear uniform motion along lead screw guide rails 11 along with slide block 13.
Described first stepper motor 1 and the second stepper motor 2 are in same perpendicular.
Described rotation axis is steel pipe.
Try to get to the heart of a matter plate and light pricker dish support column of described support, base, light pricker is all made with aluminium alloy extrusions.
A production method for microspur distributed optical fiber temperature measurement sensor, is characterized in that, comprise the following steps:
(1) production equipment of installing optical fibres temperature probe, regulates bottom support bracket height, even if make still to keep the stable, reliable of integral support operating surface on irregular ground;
(2) by mandrel outer cover on the rotating shaft, the position relationship of reasonably combined plug and fiber reel;
(3) one end of optical fiber head and plug is fixed;
(4) start the first stepper motor 1 and the second stepper motor 2 simultaneously, plug and fiber reel are synchronously driven;
(5) rate travel of plug and fiber reel is mated.
Described plug adopts pvc pipe.
Described first stepper motor 1 drives plug to rotate, and the second stepper motor 2 makes fiber reel tangential movement, by Optical Fiber Winding on plug simultaneously.
Namely the rate travel of described step (5) coupling plug and fiber reel determines that the speed ratio of the first stepper motor 1 and the second stepper motor 2 is as follows:
First stepper motor 1 rotating speed is n
1, the second stepper motor 2 rotating speed is n
2, working time, t was equal: the fiber lengths taken off from roll of optical fiber equals the fiber lengths twined on pvc pipe, the outside diameter d of PVC plug
1, lead screw guide rails outside diameter d
2, Optical Fiber Winding pitch h
1, leading screw pitch h
2, then have: n
1× t × h
1=n
2× t × h
2obtain n
1/ n
2=h
2/ h
1.
The invention has the beneficial effects as follows and the present invention is based on distributed optical fiber temperature measurement technology, by technique improvement, improve spatial resolution.Distributed optical fiber temperature measurement technology, taking optical fiber as detection and the media propagating temperature signal, is a kind of distributed, continuous print, functional fiber temperature sensor technology, for building mass concrete engineering, can reflect the change of thermograde, temperature measurement accuracy is high comprehensively.
Accompanying drawing explanation
Fig. 1 is the production equipment structural representation of microspur distributed optical fiber temperature measurement sensor.
Embodiment
The invention provides a kind of production equipment and production method of microspur distributed optical fiber temperature measurement sensor, be explained below in conjunction with accompanying drawing.
Figure 1 shows that the production equipment structural representation of microspur distributed optical fiber temperature measurement sensor.The production equipment of this microspur distributed optical fiber temperature measurement sensor is formed primarily of support, rotation axis, lead screw guide rails, two stepper motors and light pricker dish; In figure, support is made up of two-layer up and down, and wherein, upper strata is rotating part, and four root posts of support 5 are fixed on two horizontal pillows 8, and the horizontal pillow of every bar is supported by the bottom support bracket 9 of two; Install rotation axis 3 (rotation axis is steel pipe) at the rectangular frame center of support 5, one end of rotation axis 3 is connected by shaft joint and the first stepper motor 1, and the other end of rotation axis 3 is fixed on the rectangular frame of support 5 by bearing spider.Lower floor is translation part, and firm banking 15 in the middle part of two horizontal pillows 9, base 15 is fixed lead screw guide rails 11, fixes the second stepper motor 2 at the left end of base 15; One end of lead screw guide rails 11 is connected by shaft joint and the second stepper motor 2, on the other end spring bearing support plate 8 of lead screw guide rails 11; Slide block 13 is embedded in lead screw guide rails 11 by screw thread, and during work, drive lead screw guide rails 11 at the uniform velocity to sway by the second stepper motor 2, slide block 13 does linear uniform motion along lead screw guide rails 11; Then light pricker dish does linear uniform motion along lead screw guide rails 11 along with slide block 13.Wherein the first stepper motor 1 and the second stepper motor 2 are in same perpendicular.
Described smooth pricker dish for fix block plate 14 around light pricker axle 6 two ends, and is supported on light pricker dish support column 7, and light pricker dish support column 7 is fixed on light pricker and tries to get to the heart of a matter on plate 12; Try to get to the heart of a matter plate 12 of light pricker is formed with slide block 13 is fixing; Try to get to the heart of a matter plate and light pricker dish support column of described support, base, light pricker is all made with aluminium alloy extrusions.
A production method for microspur distributed optical fiber temperature measurement sensor, is characterized in that, comprise the following steps:
(1) production equipment of installing optical fibres temperature probe, regulates bottom support bracket height, even if make still to keep the stable, reliable of integral support operating surface on irregular ground;
(2) by mandrel outer cover on the rotating shaft, plug adopts pvc pipe.Be enclosed within outside pvc pipe on metal (steel pipe) rotation axis, and fix with rotation axis, follow rotating shaft and rotate together.Metal rotating shaft, except driving tubing, also as the inner core supporting pvc pipe, prevents it stressed bending; The position relationship of reasonably combined plug and fiber reel;
(3) one end of optical fiber head and plug is fixed;
(4) start the first stepper motor 1 and the second stepper motor 2 simultaneously, plug and fiber reel are synchronously driven;
(5) rate travel of plug and fiber reel is mated.
Described first stepper motor 1 drives plug to rotate, and the second stepper motor 2 makes fiber reel tangential movement, by Optical Fiber Winding on plug simultaneously.
Namely the rate travel of described step (5) coupling plug and fiber reel determines that the speed ratio of the first stepper motor 1 and the second stepper motor 2 is as follows:
First stepper motor 1 rotating speed is n
1, the second stepper motor 2 rotating speed is n
2, working time, t was equal: the fiber lengths taken off from roll of optical fiber equals the fiber lengths twined on pvc pipe, the outside diameter d of PVC plug
1, lead screw guide rails outside diameter d
2, Optical Fiber Winding pitch h
1, leading screw pitch h
2, then have:
N
1× t × h
1=n
2× t × h
2obtain n
1/ n
2=h
2/ h
1
If the outside diameter d of the PVC plug that the first stepper motor 1 drives
1=33mm; The lead screw guide rails outside diameter d that second stepper motor 2 drives
2=20mm; Optical Fiber Winding pitch h
1=5mm, optical fiber is apart from h
2≈ 0.25mm (close fiber optic is wound around, therefore optical fiber distance and fibre diameter), calculate:
n
1/n
2＝(h
1×d
2)/(h
2×d
1)＝0.25/5＝1/20。
Wherein, lead screw guide rails is fixed on the base 15 of aluminium alloy extrusions, plays a supportive role on the one hand, and what minimizing lead screw guide rails produced because of self gravitation effect bends, and avoids causing damage to precision; Also add bigger device chassis weight on the other hand, improve stability.Because whole device is narrow and high, the horizontal pillow of base bottom, considerably increases overall stability.The height of support of four pin of horizontal pillow is adjustable, even if make still to keep the stable of instrumentation face on irregular ground.
| Ingredient | Material | Cross section specification/mm | Physical dimension/mm |
| Metal shaft | Stainless steel | φ20 | 1300 |
| Support | Aluminium alloy extrusions | 40×40 | 1220×380×540 |
| Lead screw guide rails | Mild carbon steel | φ20 | 900 (walking journey) |
| Base | Aluminium alloy extrusions | 40×120 | 1200 |
| Horizontal pillow | Aluminium alloy extrusions | 40×120 | 600 |
Fiber reel fixed support is fastened on bracket base by screw by two fiber optic coils supports.On support, perforate loads dismountable ball bearing, to facilitate, the coil axle of frame between support is pulled down to change new coil, after whole device assembles, be connected with the slide block screw in lead screw guide rails by four screws of base bottom, complete the assembling of whole mechanical part.
| Ingredient | Material | Size/mm | Other data/mm |
| Bracket base | Aluminium alloy | 170×70×10 | Screw 50 × 30 |
| Fiber optic coils support | Aluminium alloy | 145×50×10 | Bore size Φ 26 |
| Coil axle | Aluminium alloy | 170 | Shaft size Φ 10 |
The present invention uses stepper motor as driver, the controllor for step-by-step motor adopted is a kind of electronic product that can send uniform pulse signal, after the signal that it sends enters stepper motor driver, meeting converts the heavy current signal required for stepper motor to by driver, drives stepper motor running.Controllor for step-by-step motor can turn over each angle by control step motor accurately.Stepper motor is opened loop control unit stepper motor part electric impulse signal being changed into angular displacement or displacement of the lines.The rotating speed of motor, the position of stopping only depending on frequency and the umber of pulse of pulse signal, and not by the impact of load change, when step actuator receives a pulse signal, it rotates a fixing angle with regard to Driving Stepping Motor by the direction of setting, be called " step angle ", its rotation runs step by step with fixing angle.Pilot angle displacement can be carried out by gating pulse number, thus reach the object of accurately location; Speed and the acceleration of electric machine rotation can be controlled simultaneously by gating pulse frequency, thus reach the object of speed governing.
Claims (8)
1. a production equipment for microspur distributed optical fiber temperature measurement sensor, is characterized in that, the production equipment of microspur distributed optical fiber temperature measurement sensor is formed primarily of support, rotation axis, lead screw guide rails, two stepper motors and light pricker dish;
Described support is made up of two-layer up and down, and wherein, upper strata is rotating part, and four root posts of support (5) are fixed on two horizontal pillows (8), and the horizontal pillow of every bar is supported by the bottom support bracket (9) of two; At the rectangular frame center of support (5), rotation axis (3) is installed, one end of rotation axis (3) is connected by shaft joint and the first stepper motor (1), and the other end of rotation axis (3) is fixed on by bearing spider on the rectangular frame of support (5); Lower floor is translation part, two horizontal pillows (9) middle part firm banking (15), in the upper fixing lead screw guide rails (11) of base (15), fix the second stepper motor (2) at the left end of base (15); One end of lead screw guide rails (11) is connected by shaft joint and the second stepper motor (2), on the other end spring bearing support plate (8) of lead screw guide rails (11); Slide block (13) is embedded in lead screw guide rails (11) by screw thread, and driving lead screw guide rails (11) at the uniform velocity to sway by the second stepper motor (2), slide block (13) does linear uniform motion along lead screw guide rails (11);
Described smooth pricker dish for fix block plate (14) around light pricker axle (6) two ends, and is supported on light pricker dish support column (7), and light pricker dish support column (7) is fixed on light pricker and tries to get to the heart of a matter on plate (12); Light pricker is tried to get to the heart of a matter, and plate (12) and slide block (13) are fixing to be formed; Then light pricker dish does linear uniform motion along lead screw guide rails (11) along with slide block (13).
2. the production equipment of a kind of microspur distributed optical fiber temperature measurement sensor according to claim 1, is characterized in that, described first stepper motor (1) and the second stepper motor (2) are in same perpendicular.
3. the production equipment of a kind of microspur distributed optical fiber temperature measurement sensor according to claim 1, it is characterized in that, described rotation axis is steel pipe.
4. the production equipment of a kind of microspur distributed optical fiber temperature measurement sensor according to claim 1, it is characterized in that, described support, base aluminium alloy extrusions are made, and try to get to the heart of a matter plate and light pricker dish support column aluminum alloy materials of light pricker is made.
5. a production method for microspur distributed optical fiber temperature measurement sensor, is characterized in that, comprises the following steps:
(1) production equipment of installing optical fibres temperature probe, regulates bottom support bracket height, even if make still to keep the stable, reliable of integral support operating surface on irregular ground;
(2) by mandrel outer cover on the rotating shaft, the position relationship of reasonably combined plug and fiber reel;
(3) one end of optical fiber head and plug is fixed;
(4) start the first stepper motor (1) and the second stepper motor (2) simultaneously, plug and fiber reel are synchronously driven;
(5) rate travel of plug and fiber reel is mated.
6. the production method of a kind of microspur distributed optical fiber temperature measurement sensor according to claim 5, is characterized in that, described plug adopts pvc pipe.
7. the production method of a kind of microspur distributed optical fiber temperature measurement sensor according to claim 5, it is characterized in that, described first stepper motor (1) drives plug to rotate, and the second stepper motor (2) makes fiber reel tangential movement, by Optical Fiber Winding on plug simultaneously.
8. the production method of a kind of microspur distributed optical fiber temperature measurement sensor according to claim 5, it is characterized in that, namely the rate travel of described step (5) coupling plug and fiber reel determines that the first stepper motor (1) is as follows with the speed ratio of the second stepper motor (2):
First stepper motor (1) rotating speed is n
1, the second stepper motor (2) rotating speed is n
2, working time, t was equal: the fiber lengths taken off from roll of optical fiber equals the fiber lengths twined on pvc pipe, the outside diameter d of PVC plug
1, lead screw guide rails outside diameter d
2, Optical Fiber Winding pitch h
1, leading screw pitch h
2, then have: n
1× t × h
1=n
2× t × h
2, obtain n
1/ n
2=h
2/ h
1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510170655.8A CN104764541B (en) | 2015-04-10 | 2015-04-10 | A kind of production equipment of microspur distributed optical fiber temperature measurement sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510170655.8A CN104764541B (en) | 2015-04-10 | 2015-04-10 | A kind of production equipment of microspur distributed optical fiber temperature measurement sensor |
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| Publication Number | Publication Date |
|---|---|
| CN104764541A true CN104764541A (en) | 2015-07-08 |
| CN104764541B CN104764541B (en) | 2018-04-20 |
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ID=53646513
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510170655.8A Expired - Fee Related CN104764541B (en) | 2015-04-10 | 2015-04-10 | A kind of production equipment of microspur distributed optical fiber temperature measurement sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110255301A (en) * | 2019-05-05 | 2019-09-20 | 东莞理工学院 | A kind of distributing optical fiber sensing BFRP intellectual rib process units |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85108873A (en) * | 1984-12-17 | 1986-06-10 | 卡维·皮雷利公司 | Be used to make the method and the production line of the ordinary optical fiber cable that has the open helix grooves cable core |
| CN201334273Y (en) * | 2008-09-11 | 2009-10-28 | 上海欧达电气成套设备工程有限公司 | Fiber ribbon take-up and winding device |
| CN203976141U (en) * | 2014-07-17 | 2014-12-03 | 洛阳名特设备技术有限公司 | A kind of textile rope wind |
-
2015
- 2015-04-10 CN CN201510170655.8A patent/CN104764541B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85108873A (en) * | 1984-12-17 | 1986-06-10 | 卡维·皮雷利公司 | Be used to make the method and the production line of the ordinary optical fiber cable that has the open helix grooves cable core |
| US4620412A (en) * | 1984-12-17 | 1986-11-04 | Societa Cavi Pirelli S.P.A. | Process and apparatus for inserting optical fibers in helical grooves of a cable core |
| CN201334273Y (en) * | 2008-09-11 | 2009-10-28 | 上海欧达电气成套设备工程有限公司 | Fiber ribbon take-up and winding device |
| CN203976141U (en) * | 2014-07-17 | 2014-12-03 | 洛阳名特设备技术有限公司 | A kind of textile rope wind |
Non-Patent Citations (1)
| Title |
|---|
| 赵晋洪: "光纤绕线机精密控制系统的研究", 《中国优秀博硕士学位论文全文数据库（硕士） 信息科技辑》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110255301A (en) * | 2019-05-05 | 2019-09-20 | 东莞理工学院 | A kind of distributing optical fiber sensing BFRP intellectual rib process units |
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|---|---|
| CN104764541B (en) | 2018-04-20 |
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