CN1080717A - Machenical coupling centering measuring method - Google Patents
Machenical coupling centering measuring method Download PDFInfo
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- CN1080717A CN1080717A CN 92104813 CN92104813A CN1080717A CN 1080717 A CN1080717 A CN 1080717A CN 92104813 CN92104813 CN 92104813 CN 92104813 A CN92104813 A CN 92104813A CN 1080717 A CN1080717 A CN 1080717A
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Abstract
A kind of measuring method of the heavy mechanical equipment shaft coupling equation of the ecentre is characterized in carrying out two groups of measurements.The measurement of this invention and data processing method can be eliminated the influence of instrument amount of deflection, and the equation of the ecentre of measuring is real data.
Description
The measuring method of this machenical coupling equation of the ecentre is specially adapted to the measurement that radial displacement of big machinery shaft coupling and two axial lines tilt.Common mechanical equipment all by shaft coupling by prime mover driven, shaft coupling centering is one of critical process in the mechanical installation process, because machine operation requires prime mover and should be a level and smooth extended line by the motivation diaxon heart.Shaft coupling centering (also claiming centering or alignment) precision is directly connected to the quality of mechanical movement.Code for construction and acceptance of mechanical equipment installation engineering all has strict requirement to the shaft coupling accuracy of alignment, positive coupling for example, and two axle center radial center differences must not be greater than 0.02-0.03mm.
Equipment shaft coupling centering is the universal measurement method of code requirement regulation all, measuring method as regulation in metallurgical machinery equipment installation work construction and the general regulation of acceptance specification (YBJ201-83), along with scientific progress, plant equipment is to high speed development, just require to install more accurate, the shaft coupling centering of some large-scale precision machineries can not meet the demands with general measuring method.Because some big machineries are because the requirement on the structure construction, prime mover with can not directly be connected by motivation with a shaft coupling, intermediate shaft be arranged, when looking for the center of large-scale shaft coupling with conventional method, be with intermediate shaft or alignment instrument one end fixing after, measure with the other end.But when intermediate shaft or tool length surpassed 500mm, its cantilever deflection caused error with regard to influencing, and was difficult to measure radially difference just of real center, and then made the two axial lines can not centering.Some plant equipment causes thermal expansion different because of working temperature, and requires two machine centre-height cold conditions that reserved value will be arranged, and to this situation, radially Gao Di measuring error just seems more important, and this just requires to eliminate the influence of instrument amount of deflection to measurement result.Purpose of the present invention just provides a kind of measuring method of eliminating the influence of survey instrument amount of deflection.
During shaft coupling centering, also be on the alignment instrument with clearance gauge (or dial gauge) diaxon while rotational positioning, by 0 °, 90 °, 180 °, 270 ° measurements.The present invention is different with the universal measurement method, is to require the shaft coupling to two ends to carry out twice measurement respectively.At first the alignment instrument is fixed on by on the shaft coupling of motivation (as blower fan), surveys the shaft coupling of prime mover (as motor), draw first group of numerical value; Again the alignment instrument is fixed on the shaft coupling of prime mover (as motor), surveys, obtain second group of numerical value by the shaft coupling of motivation (as blower fan).Be that two ends are fixing respectively, respectively two groups of numerical value that record compared, obtain actual value.
Stipulate in the standard that shaft coupling two axle center radial displacement computing formula are
ax＝ (a2-a4)/2 ，ay＝ (a1-a3)/2 ，
The present invention is owing to measure twice, and then computing method are:
ax＝（ (a2-a4)/2 + (A4-A2)/2 ）÷2
ay＝（ (a1-a3)/2 + (A3-A1)/2 ）÷2
Ax represents the radial displacement of horizontal direction in the formula,
Ay represents the radial displacement of vertical direction.
A1, a3, A1, A3 are first group and second group of data of measuring 0 °, 180 ° (being vertical direction); A2, a4, A2, A4 are first group and second group of data that record 90 °, 270 ° (being horizontal direction).Wherein main is to calculate vertical direction (or height) radial displacement.
That is to say that radial displacement computing method of the present invention are that the radial displacement numerical value that records for corresponding twice is averaged.Because amount of deflection is mainly to radially displacement, especially to vertical diameter to making a difference, other data are still calculated by the regulation of standard.
In order to illustrate that measuring method of the present invention and data processing method can eliminate the influence of alignment instrument amount of deflection, now prove as follows:
If: O is the shaft coupling center of device A
O ' is the shaft coupling center of equipment B, and is higher than the O axle.
The radially difference of height of diaxon vertical direction is OO ',
Alignment instrument amount of deflection is x
When instrument is fixed on when surveying B on the shaft coupling of device A, the O ' A that draws is OO ' and amount of deflection x sum.When instrument is fixed on when measuring A on the shaft coupling of equipment B, what the OB that measures was OO ' with x is poor.
That is: O ' A=OO '+x OB=OO '-x
Two formula additions, then O ' A+OB=OO '+x+ OO '-x=2 OO '
So the difference sum that records with two ends is divided by 2, just can obtain the truly difference of height radially in two axle center.
In addition, in order to obtain the amount of deflection of alignment instrument, we can subtract each other above-mentioned two formulas, and the gained data are exactly two times of instrument amount of deflection.Like this, the difference of the difference that two ends are recorded just can be tried to achieve the amount of deflection of alignment instrument divided by 2.
Embodiment: existing with a 7000m
3Measured data was an example when/min blower fan was installed, and was illustrated.This typhoon machine is that the axial flow stator blade is adjustable, heavy 160t is with 36140kw the two poles of the earth synchronous machine drives, intermediate shaft length 1200mm, positive coupling, producer stipulates that according to device structure and production technology characteristic blower fan and motor diaxon center require: radial motor is than the high 0.22 ± 0.05mm of blower fan; Radial motor 0.03 ± the 0.05mm(that takes over sees blower fan from motor); Axial deviation 0-0.01/100.
In order to reduce the amount of deflection influence, the alignment instrument strengthens section rigidity as far as possible, and the instrument of our usefulness is that Φ 133 * 4 steel pipes are made, and long 1200mm has welded the reinforcement gusset every 120 ° on every side.The radial difference of the shaft coupling centering data computation vertical direction that records with this instrument.Calculate according to a conventional method, with record the first time data calculate radially perpendicular displacement be 0.255mm, this value is end value.And measurement result is 0.175mm for the second time, also can be end value.Two numerical value differ a lot, are difficult to which group of explanation and measure correct.Instrument amount of deflection that Here it is influence, these two numerical value all are false.
Calculate by the inventive method, the real electrical machinery axle center is than blower fan axle center height, and its numerical value is:
(0.255+0.175)/2 ＝0.215mm
The amount of deflection of shaft coupling alignment instrument is: (0.255-0.175)/2=0.04mm as can be seen, eliminated the influence of instrument deflection value among the 0.215mm, obviously reflected radially difference of diaxon center more accurately.The numerical value some other and influence of instrument amount of deflection is little does not belong to our discussion scope, so be omitted.
In order to further specify the reliability of this method, the existing amount of deflection of calculating the alignment instrument theoretically.By uniform load (instrument deadweight) cantilever, its amount of deflection f
1=(q L
4The cantilever of)/(8EJ) and end concentrated load (it is heavy to measure plate), its amount of deflection f
2=(P L
3)/(3EJ),
These two parts calculate:
Alignment instrument deadweight (pipe and gusset plate) is 25.9Kg
Comprehensive section equatorial moment of inertia J=12377031mm
4
It is 4.9Kg that tool end is measured plate weight,
Elastic modulus E=2 * 10
4Kg/mm
2
Try to achieve instrument amount of deflection=f
1+ f
2=0.0226+0.0114=0.034mm.
Close with the instrument amount of deflection numerical value 0.04mm that calculates by actual measurement, confirmed that our method is correct.
Actual effect:
(1) two axle center that measure in this way radially difference of height numerical value meet objective reality, have avoided the illusion error in operating process, and it is not only fast but also accurate to accomplish when concrete centering is adjusted, and has saved the plenty of time.
(2) two axle center measured of this method radially difference of height numerical value be real, reached and required numerical value, meet concrete situation of change in the equipment operation.The 7000m that we install
3/ min blower fan formally puts into production already, facts have proved, unit operation is well stable.
Claims (2)
1, a kind of plant equipment shaft coupling equation of the ecentre measuring method, be specially adapted to the measurement of the heavy mechanical equipment shaft coupling equation of the ecentre, carry out with clearance gauge (or dial gauge), it is characterized in that the shaft coupling at two ends is carried out twice measurement respectively, trying to achieve true radial displacement value, is the mean value of the radial displacement that records for twice.
2, according to the described plant equipment shaft coupling of claim 1 equation of the ecentre measuring method, the amount of deflection that it is characterized in that obtaining survey instrument be the radial displacement that records for twice difference 1/2nd.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92104813 CN1080717A (en) | 1992-06-29 | 1992-06-29 | Machenical coupling centering measuring method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92104813 CN1080717A (en) | 1992-06-29 | 1992-06-29 | Machenical coupling centering measuring method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1080717A true CN1080717A (en) | 1994-01-12 |
Family
ID=4941009
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92104813 Pending CN1080717A (en) | 1992-06-29 | 1992-06-29 | Machenical coupling centering measuring method |
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|---|---|
| CN (1) | CN1080717A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102506668A (en) * | 2011-10-28 | 2012-06-20 | 中国核工业二三建设有限公司 | No-deflection centering device |
| CN105921996A (en) * | 2016-07-01 | 2016-09-07 | 中国石油天然气第建设公司 | Large unit coupling centering device and method |
| CN107036512A (en) * | 2017-05-19 | 2017-08-11 | 国网天津市电力公司 | A kind of computational methods of shaft coupling alignment |
| CN107401971A (en) * | 2017-07-26 | 2017-11-28 | 中国化学工程第三建设有限公司 | A kind of method for improving Large-scale machine set shaft assignment dial framework measurement accuracy |
-
1992
- 1992-06-29 CN CN 92104813 patent/CN1080717A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102506668A (en) * | 2011-10-28 | 2012-06-20 | 中国核工业二三建设有限公司 | No-deflection centering device |
| CN102506668B (en) * | 2011-10-28 | 2015-07-29 | 中国核工业二三建设有限公司 | Without deflection centering device |
| CN105921996A (en) * | 2016-07-01 | 2016-09-07 | 中国石油天然气第建设公司 | Large unit coupling centering device and method |
| CN107036512A (en) * | 2017-05-19 | 2017-08-11 | 国网天津市电力公司 | A kind of computational methods of shaft coupling alignment |
| CN107401971A (en) * | 2017-07-26 | 2017-11-28 | 中国化学工程第三建设有限公司 | A kind of method for improving Large-scale machine set shaft assignment dial framework measurement accuracy |
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