CN103759697B - A kind of leaf surveying instrument of rotary wheel of water turbine - Google Patents
A kind of leaf surveying instrument of rotary wheel of water turbine Download PDFInfo
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- CN103759697B CN103759697B CN201410039212.0A CN201410039212A CN103759697B CN 103759697 B CN103759697 B CN 103759697B CN 201410039212 A CN201410039212 A CN 201410039212A CN 103759697 B CN103759697 B CN 103759697B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 13
- 239000000523 sample Substances 0.000 claims abstract description 19
- 238000012545 processing Methods 0.000 claims abstract description 12
- 238000013507 mapping Methods 0.000 abstract description 13
- 238000000034 method Methods 0.000 description 11
- 238000005259 measurement Methods 0.000 description 9
- 238000012937 correction Methods 0.000 description 8
- 208000037656 Respiratory Sounds Diseases 0.000 description 7
- 238000013461 design Methods 0.000 description 7
- 230000006378 damage Effects 0.000 description 5
- 238000003466 welding Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000010977 unit operation Methods 0.000 description 3
- 238000002679 ablation Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000011000 absolute method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 210000003296 saliva Anatomy 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Abstract
The invention discloses a kind of leaf surveying instrument of rotary wheel of water turbine, including mechanical arm, signal acquiring processing system and host computer, described mechanical arm includes base, upright guide rail, swing unit, described swing unit one end is hinged with described upright guide rail by the first joint, the described swing unit other end is hinged with probe by second joint, described first joint and second joint is respectively provided with one for measuring swing unit or the code-disc of probe pendulum angle；Described signal acquiring processing system includes controlling the motor that described swing unit moves up and down, the motor driver driving described motor, the industrial control computer that is connected with described motor driver by pulse cards along described upright guide rail；Described industrial control computer is connected with described code-disc by data collecting card；Described industrial control computer accesses described host computer.The present invention provides surveying and mapping tool for measuring blade shape efficiently, quickly and accurately.
Description
Technical field
The present invention relates to a kind of space curved surface molded line mapping equipment, particularly a kind of leaf surveying instrument of rotary wheel of water turbine.
Background technology
Turbine runner blade is due to design or manufactures reason, and blade profile fails to reach exact requirements, and after operation, big repairing welding, more easily causes deformable blade, has a significant impact energy response, cavitation characteristics and the operation stability of the hydraulic turbine.China's many power stations hydraulic turbine operation for many years, owing to without leaf detection, control device, causing deformable blade, efficiency to decline after the biggest repairing welding, unit vibration, runner crackle, ablation destruction aggravate, causing the time between overhauls(TBO) to shorten, claim for eot, the cost of overhaul increases.As serious due to runner deformation in Liujiaxia hydropower plant, the cycle of expansion property overhaul shortened to 4 years from 5 years；Duration is more than four months.The Inlet water turbine anti scuffing of eight Pan Xia hydroelectric power plants destroys and is substantially better than domestic unit, but after running the biggest repairing welding, present unit also destroys because of deformable blade.Feng Tan hydroelectric power plant designs shape line due to blade substantial deviation, causes cavitation crackle to aggravate, and the welding rod processing a machine cavitation crackle consumption time the most serious reaches 800kg.Although practice makes it is recognized that the optimization of turbine runner blade depends on the Hydraulic Design, but also closely related with perfect blade correction of the flank shape.Xin ' anjiang once made cavitation damage be obviously improved by blade mapping and correction of the flank shape.Green saliva power plant, by surveying and drawing 3# machine runner bucket, carries out correction of the flank shape after finding out problem, exerts oneself and add 5000kW, and efficiency averagely improves 2%, and vibration all takes an evident turn for the better with ablation destruction.Practice have shown that, turbine runner blade correction of the flank shape is the important channel improving unit basic mechanical design feature under the existence conditions of power station.IEC also expressly provides in hydraulic turbine cavitation damage evaluation criteria: correction of the flank shape to be carried out when occurring unexpected cavitation to damage.
It is must to grasp the change of vane type line that turbine runner blade repaiies type premise the most comprehensively, and leaf mapped results i.e. must be had to coach.Owing to turbine blade has complex-shaped, spatial warping and the feature such as Curvature varying is big, in the fabrication process, non-assembly welding is become the individual blade that (rotary wheel of water turbine) is overall, the most still has reliable mapping method and means (such as digital display three coordinate method, double electronic optical theodolite method etc.).But to the runner put into operation, owing to all many condition such as space, environment limit, carry out leaf mapping and then there is suitable difficulty.The method of the past domestic conventional leaf mapping of the rotary wheel of water turbine that puts into operation has " pattern method ", " comb chaining pin method ", " triangulation method ", " method of direct coordinate " etc., these methods are in measuring accuracy, workload, the arrangement in suitable defect, with the repair time of current unit and workload is all there is the most inadaptable on test speed.
China's hydraulic power potentials enriches, numerous with built power station building, all there is cavitation in various degree and crackle in the rotary wheel of water turbine much put into operation, some turbine blade line style substantial deviation design load earlier of going into operation, consequently leads to unit efficiency and declines, vibrates a series of problems affecting unit safety, economy, stable operation such as increase, pressure fluctuation aggravation.For instructing blade correction of the flank shape, improve runner anti-cavitation crackle and unit operation stability, reduce maintenance workload, progressively shorten the time between overhauls(TBO), need to develop a kind of energy efficiently, the instrument of the leaf field surveys of runner fast and accurately, obtain bigger economic benefit with less input.
Summary of the invention
The technical problem to be solved is, not enough for prior art, the leaf surveying instrument of rotary wheel of water turbine that a kind of energy measures blade shape efficiently, quickly and accurately is provided, instruct blade correction of the flank shape, thus improve runner anti-cavitation crackle and unit operation stability, reduce maintenance workload, progressively shorten the time between overhauls(TBO).
For solving above-mentioned technical problem, the technical solution adopted in the present invention is: a kind of leaf surveying instrument of rotary wheel of water turbine, including mechanical arm, signal acquiring processing system and host computer, described mechanical arm includes base, the upright guide rail being arranged on described base, is arranged on described upright guide rail the swing unit that can move up and down along upright guide rail and rotate around described upright guide rail, described swing unit one end is hinged with described upright guide rail by the first joint, the described swing unit other end is hinged with probe by second joint, described first joint and theTwoOne respectively it is provided with for measuring swing unit or the code-disc of probe pendulum angle on joint；Described signal acquiring processing system includes controlling the motor that described swing unit moves up and down along described upright guide rail and rotate around described upright guide rail, the motor driver driving described motor, the industrial control computer that is connected by pulse cards with described motor driver；Described industrial control computer is connected with described code-disc by data collecting card；Described industrial control computer accesses described host computer.
Described swing unit includes 1～4 joint swing arms；When described swing arm quantity be 2 joints above time, hinged with described upright guide rail by joint near the first segment swing arm of described upright guide rail, final section swing arm end away from described upright guide rail is hinged with probe by joint, hinged by joint between adjacent swing arm；It is mounted on code-disc on all joints.
The swing unit of the present invention includes 4 joint swing arms.
Compared with prior art, the mechanical arm of the had the beneficial effect that present invention of the present invention uses 5 joints, 6DOF, the design of offset structure, measurement radius, up to 2.1 meters, can carry out on-the-spot leaf mapping to blade horizontal direction arc to the runner of length about 1.6 meters；Signal acquiring processing system can realize the control to mapping arm and signals collecting；The mechanical arm easy installation and removal of the present invention；No matter whether runner hangs out machine hole, blade all can be surveyed and drawn by the surveying instrument of the present invention；Mechanical arm rotates flexibly, easy to control；Use probe contact to measure, have the advantages that measuring speed is fast, certainty of measurement is high；The present invention provides surveying and mapping tool for measuring blade shape efficiently, quickly and accurately, thus for instructing blade correction of the flank shape, improves runner anti-cavitation crackle and unit operation stability, reduces maintenance workload, and progressively the shortening time between overhauls(TBO) lays the foundation.
Accompanying drawing explanation
Fig. 1 is one embodiment of the invention mechanical arm structural representation；
Fig. 2 is one embodiment of the invention signal acquiring processing system structured flowchart.
Detailed description of the invention
As depicted in figs. 1 and 2, one embodiment of the invention includes mechanical arm, signal acquiring processing system and host computer, described mechanical arm includes base 1, the upright guide rail 2 being arranged on described base 1, is arranged on described upright guide rail 2 swing unit that can move up and down along upright guide rail 2 and rotate around described upright guide rail 2, and described swing unit includes four joint swing arms 3,4,5,6；Hinged with described upright guide rail 2 by the first joint 8 near the first segment swing arm 3 of described upright guide rail 2, Section of four swing arm 6 end away from described upright guide rail 2 is hinged with probe 7 by second joint 9, between adjacent swing arm, (i.e. between first segment swing arm 3 and second section swing arm 4, between second section swing arm 4 and Section of three swing arm 5, between Section of three swing arm 5 and Section of four swing arm 6) is hinged by joint, each joint is respectively provided with one for measuring swing unit or the code-disc of probe pendulum angle；Described signal acquiring processing system includes controlling the motor that described swing unit moves up and down, the motor driver driving described motor, the industrial control computer that is connected with described motor driver by pulse cards along described upright guide rail 2；Described industrial control computer is connected with described code-disc by data collecting card；Described industrial control computer accesses described host computer.
The present invention can measure hydroelectric power plant's turbine runner blade (spatial warping) shape, and mechanical arm has multi-joint (arm), Level Multiple Degree of Freedom Structures.Every section of arm lengths difference, can rotate flexibly and move up and down, search in real time and the three-dimension curved surface of measurement complexity.The front end of multi-degree-of-freemechanical mechanical arm uses probe (contact) to measure, and has the advantages that speed is fast, certainty of measurement is high.Use servomotor to control the movement of mechanical arm, measured the corner in each joint by code-disc, thus calculate the space coordinates determining measuring point according to measurement result.
Swing unit uses 5 joints, 6DOF, offset structure, measurement radius up to 2.1 meters, the runner of machined shaping can carry out three-dimensional leaf mapping；Swing unit includes 4 sections of swing arms and a probe, overall length 1850 mm, each section of arm lengths be respectively as follows: 400 mm, 500 mm, 500 mm, 300
Mm, probe length is 150 mm.Wherein second section swing arm 4, Section of three swing arm 5 can lengthen as required, swing unit overall length up to 2100 mm.First segment swing arm 3 is ± 100 ° around the maximum angle that upright guide rail 2 rotates, and the maximum angle that other joint swing arm opposed vertical rotating shaft rotates is ± 165 °；Offset structure and the design of replaceable probe, it is ensured that leaf mapping can be carried out on the blade top of narrow space.
Mechanical arm is controlled by upper function in real time.Control the movement of mechanical arm including issue instruction, carry out communication, data exchange with signal acquiring processing system, carry out data process, show the space coordinates of probe, mapping display and printout in real time, there is the man-machine interface of close friend.
During use, open motor, utilize motor to control the moving up and down of first segment swing arm, operating personnel can remaining a few joint swing arms and probe of manual rotation as required, make probe contact measurement position.
Surveying instrument mapping precision of the present invention is high, the error of absolute method of measurement≤± 1mm, duplicate measurements error≤± 0.5mm.
In the present invention, each piece weight is less than 20kg.The disassembly and assembly of mechanical arm is simple and convenient.
Claims (3)
1. the leaf surveying instrument of rotary wheel of water turbine, including mechanical arm, signal acquiring processing system and host computer, it is characterized in that, described mechanical arm includes base (1), be arranged on described base (1) upright guide rail (2), it is arranged on described upright guide rail (2) swing unit that can move up and down along upright guide rail (2) and rotate around described upright guide rail (2), described swing unit one end is hinged with described upright guide rail (2) by the first joint, the described swing unit other end is hinged with probe (7) by second joint, described first joint and theTwoOne respectively it is provided with for measuring swing unit or the code-disc of probe pendulum angle on joint；Described signal acquiring processing system includes controlling the motor that described swing unit moves up and down, the motor driver driving described motor, the industrial control computer that is connected with described motor driver by pulse cards along described upright guide rail (2)；Described industrial control computer is connected with described code-disc by data collecting card；Described industrial control computer accesses described host computer；Described swing unit includes 1～4 joint swing arms；When described swing arm quantity be 2 joints above time, hinged with described upright guide rail (2) by the first joint near the first segment swing arm (3) of described upright guide rail (2), final section swing arm (6) end away from described upright guide rail (2) is hinged with probe (7) by second joint, hinged by joint between adjacent swing arm；It is mounted on code-disc on all joints；The maximum angle that first segment swing arm rotates around upright guide rail (2) is ± 100 °, and the maximum angle that other joint swing arm opposed vertical rotating shaft rotates is ± 165 °.
The leaf surveying instrument of rotary wheel of water turbine the most according to claim 1, it is characterised in that described swing unit includes 4 joint swing arms.
The leaf surveying instrument of rotary wheel of water turbine the most according to claim 2, it is characterised in that in described swing unit, the length of 4 joint swing arms is followed successively by 400 mm, 500 mm, 500 mm, 300 mm, a length of 150 mm of described probe (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410039212.0A CN103759697B (en) | 2014-01-27 | 2014-01-27 | A kind of leaf surveying instrument of rotary wheel of water turbine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410039212.0A CN103759697B (en) | 2014-01-27 | 2014-01-27 | A kind of leaf surveying instrument of rotary wheel of water turbine |
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| Publication Number | Publication Date |
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| CN103759697A CN103759697A (en) | 2014-04-30 |
| CN103759697B true CN103759697B (en) | 2016-09-07 |
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| CN201410039212.0A Active CN103759697B (en) | 2014-01-27 | 2014-01-27 | A kind of leaf surveying instrument of rotary wheel of water turbine |
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| CN114295857A (en) * | 2021-11-17 | 2022-04-08 | 武汉轻工大学 | Swing arm measuring device and method for rice huller |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3092379B2 (en) * | 1993-02-09 | 2000-09-25 | 石川島播磨重工業株式会社 | Blade profile inspection system |
| CN102435163A (en) * | 2011-09-20 | 2012-05-02 | 长沙理工大学 | Hydroturbine blade profile measurement device and method |
| CN102768028A (en) * | 2012-06-04 | 2012-11-07 | 天津大学 | Method and device for online in-situ measurement with single joint arm |
| CN103033117A (en) * | 2012-12-24 | 2013-04-10 | 重庆水轮机厂有限责任公司 | Water turbine runner blade assembly roundness testing frame and detection method thereof |
-
2014
- 2014-01-27 CN CN201410039212.0A patent/CN103759697B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3092379B2 (en) * | 1993-02-09 | 2000-09-25 | 石川島播磨重工業株式会社 | Blade profile inspection system |
| CN102435163A (en) * | 2011-09-20 | 2012-05-02 | 长沙理工大学 | Hydroturbine blade profile measurement device and method |
| CN102768028A (en) * | 2012-06-04 | 2012-11-07 | 天津大学 | Method and device for online in-situ measurement with single joint arm |
| CN103033117A (en) * | 2012-12-24 | 2013-04-10 | 重庆水轮机厂有限责任公司 | Water turbine runner blade assembly roundness testing frame and detection method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 叶片型面CMM测量与误差处理技术;黄英丽;《可再生能源》;20101031;第28卷(第5期);正文第144-146页 * |
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