CN103759697A - Surveying instrument for turbine runner blade shape - Google Patents
Surveying instrument for turbine runner blade shape Download PDFInfo
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- CN103759697A CN103759697A CN201410039212.0A CN201410039212A CN103759697A CN 103759697 A CN103759697 A CN 103759697A CN 201410039212 A CN201410039212 A CN 201410039212A CN 103759697 A CN103759697 A CN 103759697A
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- guide rail
- upright guide
- swing
- surveying instrument
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Abstract
The invention discloses a surveying instrument for a turbine runner blade shape. The surveying instrument comprises a mechanical arm, a signal collecting and processing system and an upper computer. The mechanical arm comprises a base, a vertical guide rail and a swinging unit, wherein one end of the swinging unit is hinged to the vertical guide rail through a first joint, the other end of the swinging unit is hinged to a probe through a second joint, and the first joint and the second joint are respectively provided with a coded disc for measuring the swinging angle of the swinging unit or the probe. The signal collecting and processing system comprises a motor, a motor driver and an industrial control computer, wherein the motor is used for controlling the swinging unit to move up and down along the vertical guide rail, the motor driver is used for driving the motor, and the industrial control computer is connected with the motor driver through a pulse card, connected with the coded discs through data collecting cards, and connected into the upper computer. According to the surveying instrument, a surveying tool is provided for efficient, rapid and accurate measurement on the blade shape.
Description
Technical field
The present invention relates to a kind of space curved surface molded line mapping equipment, the particularly leaf surveying instrument of a kind of rotary wheel of water turbine.
Background technology
Turbine runner blade is due to design or manufacture reason, and blade profile fails to reach accurate requirement, and after operation, large repairing welding, more easily causes deformable blade, and the energy response of the hydraulic turbine, cavitation characteristics and operation stability are had a significant impact.China's many power stations hydraulic turbine operation for many years, due to without leaf detection, control device, several times causes deformable blade, decrease in efficiency after large repairing welding, unit vibration, runner crackle, abrasion destroy aggravation, cause the time between overhauls(TBO) to shorten, claim for eot, recondition expense increases.If Liujiaxia hydropower plant is because runner distortion is serious, the cycle of expansion property overhaul shortened to 4 years from 5 years; Duration is more than four months.The import hydraulic turbine anti scuffing of hydroelectric power plant, Ba Pan gorge destroys and is obviously better than domestic unit, but operation is for many years several times after large repairing welding, and unit is also because deformable blade destroys now.Feng Tan hydroelectric power plant, due to blade substantial deviation design shape line, causes the aggravation of cavitation crackle, and the welding rod of processing a machine cavitation crackle consumption when the most serious reaches 800kg.Practice is recognized people, although the optimization of turbine runner blade mainly depends on the Hydraulic Design, also closely related with perfect blade correction of the flank shape.Xin ' anjiang once by blade, surveyed and drew and correction of the flank shape obviously improves cavitation damage.Green saliva power plant, by 3# machine runner bucket is surveyed and drawn, carries out correction of the flank shape after find problem, exert oneself and increased 5000kW, and efficiency on average improves 2%, and vibration destroys and all takes an evident turn for the better with abrasion.Practice shows, turbine runner blade correction of the flank shape is an important channel of improving unit basic mechanical design feature under the existence conditions of power station.IEC also expressly provides in hydraulic turbine cavitation damage evaluation criteria: when the cavitation that meets accident is damaged, will carry out correction of the flank shape.
It is to grasp in advance the variation of vane type line that turbine runner blade is repaiied type prerequisite comprehensively, must have leaf mapping result to coach.Because turbine blade has the features such as complex-shaped, spatial warping and curvature change greatly, in manufacture process, assembly welding is not become to (rotary wheel of water turbine) whole individual blade, still have reliable mapping method and means (as digital display three-dimensional method, bielectron transit method etc.) at present.But to the runner having put into operation, due to many condition restriction such as space, environment, carry out leaf mapping and have suitable difficulty.The method of the domestic conventional leaf mapping of rotary wheel of water turbine that puts into operation of past has " pattern method ", " broach chaining pin method ", " triangulation method ", " method of direct coordinate " etc., these methods are in measuring accuracy, workload, on test speed, all there is suitable defect, extremely inadaptable with repair time and the arrangement in workload of current unit.
China's hydraulic power potentials is abundant, build with built power station numerous, all there is cavitation and crackle in various degree in the rotary wheel of water turbine much putting into operation, some turbine blade line style of going into operation is early substantial deviation design load, has caused thus a series of problems that affect unit safety, economy, stable operation such as unit efficiency decline, vibration 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 can be efficiently, the instrument of the leaf on-the-spot mapping of runner fast and accurately, with less input, obtain larger economic benefit.
Summary of the invention
Technical matters to be solved by this invention is, not enough for prior art, a kind of leaf surveying instrument of rotary wheel of water turbine that can measure efficiently, quickly and accurately blade shape is provided, instruct blade correction of the flank shape, thereby improve runner anti-cavitation crackle and unit operation stability, reduce maintenance workload, progressively shorten the time between overhauls(TBO).
For solving the problems of the technologies described above, the technical solution adopted in the present invention is: the leaf surveying instrument of a kind of rotary wheel of water turbine, comprise mechanical arm, signal acquiring processing system and host computer, described mechanical arm comprises base, be arranged on upright guide rail on described base, be arranged on the swing unit that can move up and down and rotate around described upright guide rail along upright guide rail on described upright guide rail, described swing unit one end is hinged by the first joint and described upright guide rail, the described swing unit other end is hinged by second joint and probe, described the first joint and
twoon joint, be respectively provided with one for measuring the code-disc of swing unit or probe pendulum angle; Described signal acquiring processing system comprises the motor controlling described swing unit and move up and down and rotate around described upright guide rail along described upright guide rail, drives the motor driver of described motor, the industrial control computer being connected with described motor driver by pulse cards; 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 comprises 1～4 joint swing arm; When described swing arm quantity is that 2 joints are when above, first segment swing arm near described upright guide rail is hinged by joint and described upright guide rail, final section swing arm end away from described upright guide rail is hinged by joint and probe, hinged by joint between adjacent swing arm; Code-disc is all installed on all joints.
Swing unit of the present invention comprises 4 joint swing arms.
Compared with prior art, the beneficial effect that the present invention has is: mechanical arm of the present invention adopts 5 joints, 6DOF, offset structural design, measure radius and can reach 2.1 meters, can to the runner of 1.6 meters of left and right of length, carry out on-the-spot leaf mapping to blade horizontal direction arc; Signal acquiring processing system can be realized control and the signals collecting to mapping arm; Mechanical arm easy installation and removal of the present invention; No matter whether runner hangs out machine hole, surveying instrument of the present invention all can be surveyed and drawn blade; Mechanical arm rotates flexibly, and it is convenient to control; Adopt probe contact to measure, have the advantages that measuring speed is fast, measuring accuracy is high; The present invention provides surveying and mapping tool for measuring blade shape efficiently, quickly and accurately, thereby for instructing blade correction of the flank shape, improves runner anti-cavitation crackle and unit operation stability, reduces maintenance workload, progressively shortens the time between overhauls(TBO) to lay 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.
Embodiment
As depicted in figs. 1 and 2, one embodiment of the invention comprises mechanical arm, signal acquiring processing system and host computer, described mechanical arm comprises base 1, be arranged on upright guide rail 2 on described base 1, be arranged on the swing unit that can move up and down and rotate around described upright guide rail 2 along upright guide rail 2 on described upright guide rail 2, and described swing unit comprises four joint swing arms 3,4,5,6; First segment swing arm 3 near described upright guide rail 2 is hinged with described upright guide rail 2 by the first joint 8, the 4th joint swing arm 6 ends away from described upright guide rail 2 are hinged by second joint 9 and probe 7, between adjacent swing arm (be between first segment swing arm 3 and second section swing arm 4, between second section swing arm 4 and the 3rd joint swing arm 5, between the 3rd joint swing arm 5 and the 4th joint swing arm 6) to pass through joint hinged, on each joint, be respectively provided with one for measuring the code-disc of swing unit or probe pendulum angle; Described signal acquiring processing system comprises the motor of controlling described swing unit and moving up and down along described upright guide rail 2, the motor driver that drives described motor, the industrial control computer being connected with described motor driver by pulse cards; 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 (multistage arm), Level Multiple Degree of Freedom Structures.Every section of arm lengths difference, can rotate flexibly and move up and down, real-time search and the complicated three-dimension curved surface of measurement.The front end of multi freedom degree mechanical arm adopts probe (contact) to measure, and has the advantages that speed is fast, measuring accuracy is high.Adopt servomotor to control the movement of mechanical arm, by code-disc, measure the corner in each joint, thereby according to the volume coordinate of measurement result calculative determination measuring point.
Swing unit adopts 5 joints, 6DOF, offset structure, measures radius and can reach 2.1 meters, can carry out three-dimensional leaf mapping to the runner having shaped; Swing unit comprises 4 sections of swing arms and a probe, overall length 1850 mm, and each section of arm lengths is respectively: 400 mm, 500 mm, 500 mm, 300 mm, probe length is 150 mm.Wherein second section swing arm 4, the 3rd joint swing arm 5 can lengthen as required, and swing unit overall length is the longest is 2100 mm.First segment swing arm 3 is ± 100 ° around the maximum angle of upright guide rail 2 rotations, and other joint swing arm is ± 165 ° relative to the maximum angle that vertically rotating shaft is rotated; Offset structure and replaceable probe design, guaranteed to carry out leaf mapping on the blade top of narrow space.
Upper function is controlled in real time to mechanical arm.Comprise the movement of issuing command control mechanical arm, carry out communication, exchanges data with signal acquiring processing system, carry out data processing, show that in real time the volume coordinate of probe, mapping show and printout to have friendly man-machine interface.
During use, open motor, utilize moving up and down of Electric Machine Control first segment swing arm, operating personnel are all the other a few joint swing arms and probes 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 single-piece weight is no more than 20kg.The dismounting of mechanical arm and assemble simple and convenient.
Claims (4)
1. the leaf surveying instrument of rotary wheel of water turbine, comprise mechanical arm, signal acquiring processing system and host computer, it is characterized in that, described mechanical arm comprises base (1), be arranged on upright guide rail (2) on described base (1), be arranged on the swing unit that can move up and down and rotate around described upright guide rail (2) along upright guide rail (2) on described upright guide rail (2), described swing unit one end is hinged by the first joint and described upright guide rail (2), the described swing unit other end is hinged by second joint and probe (7), described the first joint and
twoon joint, be respectively provided with one for measuring the code-disc of swing unit or probe pendulum angle; Described signal acquiring processing system comprises the motor of controlling described swing unit and moving up and down along described upright guide rail (2), the motor driver that drives described motor, the industrial control computer being connected with described motor driver by pulse cards; Described industrial control computer is connected with described code-disc by data collecting card; Described industrial control computer accesses described host computer.
2. the leaf surveying instrument of rotary wheel of water turbine according to claim 1, is characterized in that, described swing unit comprises 1～4 joint swing arm; When described swing arm quantity is that 2 joints are when above, first segment swing arm (3) near described upright guide rail (2) is hinged by joint and described upright guide rail (2), final section swing arm (6) end away from described upright guide rail (2) is hinged by joint and probe (7), hinged by joint between adjacent swing arm; Code-disc is all installed on all joints.
3. the leaf surveying instrument of rotary wheel of water turbine according to claim 2, is characterized in that, described swing unit comprises 4 joint swing arms.
4. the leaf surveying instrument of rotary wheel of water turbine according to claim 3, is characterized 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, and described probe (7) length is 150 mm.
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 |
Applications Claiming Priority (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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| Publication Number | Publication Date |
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| CN103759697A true CN103759697A (en) | 2014-04-30 |
| CN103759697B CN103759697B (en) | 2016-09-07 |
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| Application Number | Title | Priority Date | Filing Date |
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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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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
|---|
| 黄英丽: "叶片型面CMM测量与误差处理技术", 《可再生能源》, vol. 28, no. 5, 31 October 2010 (2010-10-31), pages 144 - 146 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114295857A (en) * | 2021-11-17 | 2022-04-08 | 武汉轻工大学 | Swing arm measuring device and method for rice huller |
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| CN103759697B (en) | 2016-09-07 |
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